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GitHub - lsds/TaLoS: Efficient TLS termination inside Intel SGX enclaves for existing applications
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1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"github_advanced_security","context":"product","tag":"link","label":"github_advanced_security_link_product_navbar"}" href="https://github.com/security/advanced-security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" 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0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"github_skills","context":"product","tag":"link","label":"github_skills_link_product_navbar"}" href="https://skills.github.com"> GitHub Skills <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 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6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="dn3YRSRTfyKVqC8DjjDHAjx1uRRNv1BDFkeWqfByAjxWtkvjoebLhyMlgx0G/n58oiYZCn76Lxx4cJXERyXGiQ==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" 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data-target="react-partial.embeddedData">{"props":{"initialPayload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":85239830,"defaultBranch":"master","name":"TaLoS","ownerLogin":"lsds","currentUserCanPush":false,"isFork":false,"isEmpty":false,"createdAt":"2017-03-16T20:42:42.000Z","ownerAvatar":"https://avatars.githubusercontent.com/u/989082?v=4","public":true,"private":false,"isOrgOwned":true},"currentUser":null,"refInfo":{"name":"master","listCacheKey":"v0:1489696964.0","canEdit":false,"refType":"branch","currentOid":"9c959980de0c6d2a80582e3546747823ea3eca69"},"tree":{"items":[{"name":"conf","path":"conf","contentType":"directory"},{"name":"src","path":"src","contentType":"directory"},{"name":".dockerignore","path":".dockerignore","contentType":"file"},{"name":".gitignore","path":".gitignore","contentType":"file"},{"name":"Dockerfile","path":"Dockerfile","contentType":"file"},{"name":"LICENSE","path":"LICENSE","contentType":"file"},{"name":"README.md","path":"README.md","contentType":"file"}],"templateDirectorySuggestionUrl":null,"readme":null,"totalCount":7,"showBranchInfobar":false},"fileTree":null,"fileTreeProcessingTime":null,"foldersToFetch":[],"treeExpanded":false,"symbolsExpanded":false,"isOverview":true,"overview":{"banners":{"shouldRecommendReadme":false,"isPersonalRepo":false,"showUseActionBanner":false,"actionSlug":null,"actionId":null,"showProtectBranchBanner":false,"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_repo","releasePath":"/lsds/TaLoS/releases/new?marketplace=true","showPublishActionBanner":false},"interactionLimitBanner":null,"showInvitationBanner":false,"inviterName":null,"actionsMigrationBannerInfo":{"releaseTags":[],"showImmutableActionsMigrationBanner":false,"initialMigrationStatus":null}},"codeButton":{"contactPath":"/contact","isEnterprise":false,"local":{"protocolInfo":{"httpAvailable":true,"sshAvailable":null,"httpUrl":"https://github.com/lsds/TaLoS.git","showCloneWarning":null,"sshUrl":null,"sshCertificatesRequired":null,"sshCertificatesAvailable":null,"ghCliUrl":"gh 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Enclaves for Existing Applications\u003c/h1\u003e\u003ca id=\"user-content-talos-efficient-tls-termination-inside-sgx-enclaves-for-existing-applications\" class=\"anchor\" aria-label=\"Permalink: TaLoS: Efficient TLS Termination Inside SGX Enclaves for Existing Applications\" href=\"#talos-efficient-tls-termination-inside-sgx-enclaves-for-existing-applications\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTaLoS\u003csup\u003e\u003ca href=\"#talosfootnote\"\u003e1\u003c/a\u003e\u003c/sup\u003e is a TLS library that allows existing\napplications (with an OpenSSL/LibreSSL interface) to securely terminate their\nTLS connection. For this, TaLoS places security-sensistive code and data of the\nTLS library inside an \u003ca href=\"https://software.intel.com/sgx-sdk\" rel=\"nofollow\"\u003eIntel SGX enclave\u003c/a\u003e,\nwhile the rest of the application remains outside. It can then be used as the\nbuilding block for a wide range of security-critical applications for which the\nintegrity and/or confidentiality of TLS connections must be guaranteed. TaLoS\noffers the developper a \u003ca href=\"#secure-processing-of-tls-communications\"\u003esimple interface\u003c/a\u003e to process TLS communications securely. For example, this interface can be used to securely\nsend the HTTPS requests and responses to another enclave or to encrypt them\nbefore logging them to persistent storage. TaLoS provides good performance by\nexecuting enclave transitions asynchronously and leveraging user-level\nthreading inside the enclave.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe code is accompanied with a \u003ca href=\"https://www.doc.ic.ac.uk/research/technicalreports/2017/DTRS17-5.pdf\" rel=\"nofollow\"\u003etechnical report\u003c/a\u003e, containing\ndetails about the architecture and performance results.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn contrast to the \u003ca href=\"https://software.intel.com/en-us/sgx-sdk/download\" rel=\"nofollow\"\u003eSSL add-on for the Intel SGX SDK\u003c/a\u003e, TaLoS exposes the\nOpenSSL/LibreSSL API to untrusted code outside of the enclave. This means that\nexisting applications can use the TaLoS library with no or only minor\nmodifications. The Intel SGX SDK SSL add-on does not expose an outside\ninterface, which means that applications must be modified to use it.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe current implementation of TaLoS utilises libreSSL v2.4.1 and has been\ntested with the following applications under Linux:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://httpd.apache.org/\" rel=\"nofollow\"\u003eApache web server\u003c/a\u003e (v2.4.23);\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"http://nginx.org/\" rel=\"nofollow\"\u003eNginx web server\u003c/a\u003e (v1.11.0);\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"http://www.squid-cache.org/\" rel=\"nofollow\"\u003eSquid proxy\u003c/a\u003e (v3.5.23).\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQuick set-up using Docker\u003c/h2\u003e\u003ca id=\"user-content-quick-set-up-using-docker\" class=\"anchor\" aria-label=\"Permalink: Quick set-up using Docker\" href=\"#quick-set-up-using-docker\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe provide a Dockerfile that is configured to run Apache with TaLoS and the SGX\nsimulator. The Dockerfile can be found in the root folder of this\nrepository. To use it:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eClone the repository\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eBuild the TaLoS Docker image by running \u003ccode\u003edocker build -t talos .\u003c/code\u003e from within\nthe root directory of the repository\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eRun Apache with TaLoS by running the Docker image: \u003ccode\u003edocker run -dt -p 7778:7778 talos /start.sh\u003c/code\u003e\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eVerify that Apache is running: \u003ccode\u003ewget --no-check-certificate https://localhost:7778/index.html\u003c/code\u003e\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eManual Installation\u003c/h2\u003e\u003ca id=\"user-content-manual-installation\" class=\"anchor\" aria-label=\"Permalink: Manual Installation\" href=\"#manual-installation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFollow these instructions to build the TaLoS library and the sample\napplications. We assume that the path to the repository is \u003ccode\u003e${PROJECT_ROOT}\u003c/code\u003e\n(eg \u003ccode\u003e/home/\u0026lt;username\u0026gt;/talos/\u003c/code\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCompiling the TaLoS Library\u003c/h3\u003e\u003ca id=\"user-content-compiling-the-talos-library\" class=\"anchor\" aria-label=\"Permalink: Compiling the TaLoS Library\" href=\"#compiling-the-talos-library\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe source code specific to TaLoS can be found in \u003ccode\u003e${PROJECT_ROOT}/src/talos\u003c/code\u003e\nwhile the original code of libreSSL is in \u003ccode\u003e${PROJECT_ROOT}/src/libressl-2.4.1\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo patch libreSSL, you need to execute:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cd ${PROJECT_ROOT}/src/talos\n$ ./patch_libressl.sh\"\u003e\u003cpre\u003e$ \u003cspan class=\"pl-c1\"\u003ecd\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/talos\n$ ./patch_libressl.sh\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo compile TaLos, go to the \u003ccode\u003e${PROJECT_ROOT}/src/libressl-2.4.1/crypto\u003c/code\u003e\ndirectory and edit the \u003ccode\u003eenclaveshim_config.h\u003c/code\u003e file. In particular, you need to\nundefine \u003ccode\u003eCOMPILE_OPTIMISATION_FOR_APACHE\u003c/code\u003e when compiling TaLoS for Squid or\nNginx. Afer that, execute one of the following lines:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ make -f Makefile.nosgx # no SGX\n$ make -f Makefile.sgx # SGX, simulator mode\n$ SGX_PRERELEASE=1 SGX_MODE=HW make -f Makefile.sgx # SGX, real hardware mode\"\u003e\u003cpre\u003e$ make -f Makefile.nosgx \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e no SGX\u003c/span\u003e\n$ make -f Makefile.sgx \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e SGX, simulator mode\u003c/span\u003e\n$ SGX_PRERELEASE=1 SGX_MODE=HW make -f Makefile.sgx \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e SGX, real hardware mode\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis creates three files:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003elibenclave.so\u003c/code\u003e and \u003ccode\u003elibenclave.a\u003c/code\u003e are the untrusted libraries that link\nagainst the application. The Makefile generates both a static and shared\nversions, but you should use only one of them, depending on your application.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eThe trusted library, which executes inside an SGX enclave, is\n\u003ccode\u003eenclave.signed.so\u003c/code\u003e. The code expects this library to be present in the\ncurrent directory when launching the application. The easiest way to ensure\nthis is to create a symbolic link, as shown in the next sections.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eFinally, several symbolic links to the untrusted TaLoS library file have to be\ncreated in \u003ccode\u003e${PROJECT_ROOT}/src/libressl-2.4.1/lib\u003c/code\u003e :\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"make -f Makefile.nosgx install # without SGX\nmake -f Makefile.sgx install # with SGX, simulator or hardware mode\"\u003e\u003cpre\u003emake -f Makefile.nosgx install \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e without SGX\u003c/span\u003e\nmake -f Makefile.sgx install \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e with SGX, simulator or hardware mode\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that, since the SGX SDK v2.0, the SDK libraries make calls to OpenSSL in\nsimulation mode to emulate cryptographic functions that would normally happen\ninside the enclave. However, as TaLoS replaces OpenSSL this creates a conflict\n(see \u003ca href=\"https://github.com/lsds/TaLoS/issues/12\" data-hovercard-type=\"issue\" data-hovercard-url=\"/lsds/TaLoS/issues/12/hovercard\"\u003eissue #12\u003c/a\u003e). TaLoS, when created\nin simulation mode, separately loads the system OpenSSL library. The path is\ndefined by the \u003ccode\u003eOPENSSL_LIBRARY_PATH\u003c/code\u003e macro in \u003ccode\u003eenclaveshim_config.h\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing TaLoS with Nginx\u003c/h3\u003e\u003ca id=\"user-content-using-talos-with-nginx\" class=\"anchor\" aria-label=\"Permalink: Using TaLoS with Nginx\" href=\"#using-talos-with-nginx\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFirst, download Nginx v1.11.0:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"wget http://nginx.org/download/nginx-1.11.0.tar.gz\"\u003e\u003cpre\u003ewget http://nginx.org/download/nginx-1.11.0.tar.gz\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe assume that you have downloaded and extracted Nginx to \u003ccode\u003e${PROJECT_ROOT}/src/nginx-1.11.0\u003c/code\u003e. You can then to run configure:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"./configure --prefix=${PROJECT_ROOT}/src/nginx-1.11.0/install --with-http_ssl_module --with-openssl=${PROJECT_ROOT}/src/libressl-2.4.1/\"\u003e\u003cpre\u003e./configure --prefix=\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/nginx-1.11.0/install --with-http_ssl_module --with-openssl=\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/libressl-2.4.1/\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou then need to edit \u003ccode\u003eobjs/Makefile\u003c/code\u003e:\u003c/p\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003echeck that the path for the include directory of libressl is correct in \u003ccode\u003eALL_INCS\u003c/code\u003e and \u003ccode\u003eCORE_INCS\u003c/code\u003e;\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eremove the \u003ccode\u003einclude/openssl/ssh.h\u003c/code\u003e line in \u003ccode\u003eCORE_DEPS\u003c/code\u003e and the\n\u003ccode\u003einclude/openssl/ssh.h\u003c/code\u003e rule (we have already compiled libressl);\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003ein \u003ccode\u003eobjs/nginx\u003c/code\u003e, for the LINK phase, update the following line with the\ncorrect path to \u003ccode\u003elibssl.a\u003c/code\u003e and \u003ccode\u003elibcrypto.a\u003c/code\u003e and add \u003ccode\u003e-lsgx_urts -lsgx_uae_service\u003c/code\u003e. Depending on how you compiled TaLoS, you may want to\nchange \u003ccode\u003e-lsgx_urts -lsgx_uae_service\u003c/code\u003e (real hardware) to \u003ccode\u003e-lsgx_urts_sim -lsgx_uae_service_sim\u003c/code\u003e (simulator).\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp dir=\"auto\"\u003eThe code is ready to be compiled:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ make\n$ make install\"\u003e\u003cpre\u003e$ make\n$ make install\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBefore starting the server, you need to copy the Nginx configuration from\n\u003ccode\u003e${PROJECT_ROOT}/conf/nginx/\u003c/code\u003e to \u003ccode\u003einstall/conf\u003c/code\u003e, create your own TLS certificate\nand associated keys, and change the paths in \u003ccode\u003einstall/conf/nginx.conf\u003c/code\u003e to\nreflect the location where you cloned TaLoS:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cp ${PROJECT_ROOT}/conf/nginx/* install/conf/\n$ sed -i 's#/home/talos/talos#${PROJECT_ROOT}#' install/conf/nginx.conf\n$ echo \u0026quot;\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u0026quot; | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/nginx-1.11.0/install/conf/cert.key -out ${PROJECT_ROOT}/src/nginx-1.11.0/install/conf/cert.crt\n$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\"\u003e\u003cpre\u003e$ cp \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/conf/nginx/\u003cspan class=\"pl-k\"\u003e*\u003c/span\u003e install/conf/\n$ sed -i \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003es#/home/talos/talos#${PROJECT_ROOT}#\u003cspan class=\"pl-pds\"\u003e'\u003c/span\u003e\u003c/span\u003e install/conf/nginx.conf\n$ \u003cspan class=\"pl-c1\"\u003eecho\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003e|\u003c/span\u003e openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/nginx-1.11.0/install/conf/cert.key -out \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/nginx-1.11.0/install/conf/cert.crt\n$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo start Nginx (\u003ccode\u003eLD_LIBRARY_PATH\u003c/code\u003e is needed only if you use the TaLoS shared library):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$(pwd)/../libressl-2.4.1/lib ./objs/nginx\"\u003e\u003cpre\u003e$ LD_LIBRARY_PATH=\u003cspan class=\"pl-smi\"\u003e${LD_LIBRARY_PATH}\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e$(\u003c/span\u003epwd\u003cspan class=\"pl-pds\"\u003e)\u003c/span\u003e\u003c/span\u003e/../libressl-2.4.1/lib ./objs/nginx\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou should be able to access the web pages with:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ wget --no-check-certificate https://localhost:7778/index.html\"\u003e\u003cpre\u003e$ wget --no-check-certificate https://localhost:7778/index.html\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing TaLoS with Apache\u003c/h3\u003e\u003ca id=\"user-content-using-talos-with-apache\" class=\"anchor\" aria-label=\"Permalink: Using TaLoS with Apache\" href=\"#using-talos-with-apache\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFirst, download Apache v2.4.23:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"wget http://archive.apache.org/dist/httpd/httpd-2.4.23.tar.bz2\"\u003e\u003cpre\u003ewget http://archive.apache.org/dist/httpd/httpd-2.4.23.tar.bz2\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe assume that you have extracted Apache to\n\u003ccode\u003e${PROJECT_ROOT}/src/httpd-2.4.23\u003c/code\u003e. You can now configure it:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ ./configure --prefix=${PROJECT_ROOT}/src/httpd-2.4.23/install --enable-http --enable-proxy --enable-ssl --enable-ssl-staticlib-deps --with-ssl=${PROJECT_ROOT}/src/libressl-2.4.1 --enable-file-cache --enable-cache --enable-disk-cache --enable-mem-cache --enable-deflate --enable-expires --enable-headers --enable-usertrack --enable-cgi --enable-vhost-alias --enable-rewrite --enable-so --with-mpm=worker\"\u003e\u003cpre\u003e$ ./configure --prefix=\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/httpd-2.4.23/install --enable-http --enable-proxy --enable-ssl --enable-ssl-staticlib-deps --with-ssl=\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/libressl-2.4.1 --enable-file-cache --enable-cache --enable-disk-cache --enable-mem-cache --enable-deflate --enable-expires --enable-headers --enable-usertrack --enable-cgi --enable-vhost-alias --enable-rewrite --enable-so --with-mpm=worker\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou then need to update \u003ccode\u003emodules/ssl/modules.mk\u003c/code\u003e as follows (you may want to\nchange \u003ccode\u003e-lsgx_urts -lsgx_uae_service\u003c/code\u003e to \u003ccode\u003e-lsgx_urts_sim -lsgx_uae_service_sim\u003c/code\u003e\nto use the SGX simulator; note that you need to expand the ${PROJECT_ROOT}\nvariable in this file):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"MOD_CFLAGS = -I${PROJECT_ROOT}/src/libressl-2.4.1/include\nMOD_LDFLAGS = -L${PROJECT_ROOT}/src/libressl-2.4.1/lib -lssl -lcrypto -ldl -luuid -lrt -lcrypt -lpthread -lsgx_urts -lsgx_uae_service\"\u003e\u003cpre\u003eMOD_CFLAGS = -I\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/libressl-2.4.1/include\nMOD_LDFLAGS = -L\u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/libressl-2.4.1/lib -lssl -lcrypto -ldl -luuid -lrt -lcrypt -lpthread -lsgx_urts -lsgx_uae_service\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo work properly with TaLoS, Apache requires the \u003ccode\u003eCOMPILE_OPTIMISATION_FOR_APACHE\u003c/code\u003e macro in \u003ccode\u003eenclaveshim_config.h\u003c/code\u003e to be defined. If this is not the case, then you will first need to define it and compile TaLoS again.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eApache is now ready to be compiled and installed:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ make\n$ make install\"\u003e\u003cpre\u003e$ make\n$ make install\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe configuration to use Apache with HTTPS can be found in\n\u003ccode\u003e${PROJECT_ROOT}/conf/apache/\u003c/code\u003e. You need to copy the content of this directory\nto \u003ccode\u003einstall/conf/\u003c/code\u003e and edit it to reflect your configuration. You may want to\nchange the user and group to run httpd as well as the \u003ccode\u003e/talos\u003c/code\u003e path. You also\nneed to create your own TLS certificate and associated keys:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ echo \u0026quot;\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u0026quot; | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/httpd-2.4.23/install/conf/cert.key -out ${PROJECT_ROOT}/src/httpd-2.4.23/install/conf/cert.crt\n$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\"\u003e\u003cpre\u003e$ \u003cspan class=\"pl-c1\"\u003eecho\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003e|\u003c/span\u003e openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/httpd-2.4.23/install/conf/cert.key -out \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/httpd-2.4.23/install/conf/cert.crt\n$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBefore starting Apache, you need to create the following symbolic links:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\n$ ln -s ../../../libressl-2.4.1/lib/libssl.so install/lib/libssl.so\n$ ln -s ../../../libressl-2.4.1/lib/libcrypto.so install/lib/libcrypto.so\"\u003e\u003cpre\u003e$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\n$ ln -s ../../../libressl-2.4.1/lib/libssl.so install/lib/libssl.so\n$ ln -s ../../../libressl-2.4.1/lib/libcrypto.so install/lib/libcrypto.so\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFinally, you can use the following command to start Apache:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ ./install/bin/httpd -X #-\u0026gt; only 1 process, no fork\"\u003e\u003cpre\u003e$ ./install/bin/httpd -X \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e-\u0026gt; only 1 process, no fork\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can access web pages with:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ wget --no-check-certificate https://localhost:7778/index.html\"\u003e\u003cpre\u003e$ wget --no-check-certificate https://localhost:7778/index.html\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that, by default, TaLoS is compiled for 50 concurrent threads inside the\nenclave (see \u003ccode\u003eTCSNum\u003c/code\u003e in \u003ccode\u003eenclave.config.xml\u003c/code\u003e) while Apache might use hundreds\nof threads (see the worker module options in\n\u003ccode\u003ehttp-2.4.23/install/config/extra/http-mpm.conf\u003c/code\u003e). You might want to make\nthese numbers consistent.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsing TaLoS with Squid\u003c/h3\u003e\u003ca id=\"user-content-using-talos-with-squid\" class=\"anchor\" aria-label=\"Permalink: Using TaLoS with Squid\" href=\"#using-talos-with-squid\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFirst, download Squid v3.5.23:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"wget http://www.squid-cache.org/Versions/v3/3.5/squid-3.5.23.tar.gz\"\u003e\u003cpre\u003ewget http://www.squid-cache.org/Versions/v3/3.5/squid-3.5.23.tar.gz\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWe assume that you have downloaded and extracted the code to\n\u003ccode\u003e${PROJECT_ROOT}/src/squid-3.5.23\u003c/code\u003e. You first need to configure it:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"$ ./configure --prefix=${PROJECT_ROOT}/src/squid-3.5.23/install --disable-shared --enable-static --enable-silent-rules --enable-dependency-tracking --enable-icmp --enable-delay-pools --enable-useragent-log --enable-esi --enable-follow-x-forwarded-for --enable-auth --with-openssl=/home/talos/talos/src/libressl-2.4.1\n$ patch -p0 -i ${PROJECT_ROOT}/conf/squid/src.ssl.gadgets.cc.patch\n$ find . -name \u0026quot;Makefile\u0026quot; -exec sed --in-place 's/-lcrypto/-lcrypto -lsgx_urts -lsgx_uae_service -lpthread/' {} \\; # as stated previously, add _sim if TaLoS has been compiled for the SGX simulator\n$ make \u0026amp;\u0026amp; make install\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e$ ./configure --prefix=${PROJECT_ROOT}/src/squid-3.5.23/install --disable-shared --enable-static --enable-silent-rules --enable-dependency-tracking --enable-icmp --enable-delay-pools --enable-useragent-log --enable-esi --enable-follow-x-forwarded-for --enable-auth --with-openssl=/home/talos/talos/src/libressl-2.4.1\n$ patch -p0 -i ${PROJECT_ROOT}/conf/squid/src.ssl.gadgets.cc.patch\n$ find . -name \"Makefile\" -exec sed --in-place 's/-lcrypto/-lcrypto -lsgx_urts -lsgx_uae_service -lpthread/' {} \\; # as stated previously, add _sim if TaLoS has been compiled for the SGX simulator\n$ make \u0026amp;\u0026amp; make install\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo configure Squid, copy the content of \u003ccode\u003e${PROJECT_ROOT}/conf/squid/\u003c/code\u003e to\n\u003ccode\u003einstall/etc/\u003c/code\u003e, update the configuration to reflect your installation and\ncreate your own TLS certificate and associated keys. This installation is\nconfigured to use the \u003ccode\u003essl_bump\u003c/code\u003e module to decrypt the HTTPS traffic.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ cp ${PROJECT_ROOT}/conf/squid/* install/etc/\n$ echo \u0026quot;\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u0026quot; | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/squid-3.5.23/install/etc/cert.key -out ${PROJECT_ROOT}/src/squid-3.5.23/install/etc/cert.crt\"\u003e\u003cpre\u003e$ cp \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/conf/squid/\u003cspan class=\"pl-k\"\u003e*\u003c/span\u003e install/etc/\n$ \u003cspan class=\"pl-c1\"\u003eecho\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\\nABC\\nMy City\\nMy Institution\\n\\nwww.example.com\\n\\n\u003cspan class=\"pl-pds\"\u003e\"\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-k\"\u003e|\u003c/span\u003e openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/squid-3.5.23/install/etc/cert.key -out \u003cspan class=\"pl-smi\"\u003e${PROJECT_ROOT}\u003c/span\u003e/src/squid-3.5.23/install/etc/cert.crt\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou also need to create a symbolic link to the enclave library:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\"\u003e\u003cpre\u003e$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo run Squid (\u003ccode\u003eLD_LIBRARY_PATH\u003c/code\u003e is needed only if you use TaLoS shared library):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$(pwd)/../libressl-2.4.1/lib ./install/sbin/squid -CNd3\n# -C: do not catch fatal signals\n# -N: no daemon mode (i.e., stays on foreground)\n# -d3 is to have some debugging messages\"\u003e\u003cpre\u003eLD_LIBRARY_PATH=\u003cspan class=\"pl-smi\"\u003e${LD_LIBRARY_PATH}\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e\u003cspan class=\"pl-pds\"\u003e$(\u003c/span\u003epwd\u003cspan class=\"pl-pds\"\u003e)\u003c/span\u003e\u003c/span\u003e/../libressl-2.4.1/lib ./install/sbin/squid -CNd3\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e -C: do not catch fatal signals\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e -N: no daemon mode (i.e., stays on foreground)\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e -d3 is to have some debugging messages\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor testing, the port is 3128 in \u003ccode\u003ehttps_proxy\u003c/code\u003e, which corresponds to the http\nproxy port, as the client needs to send a CONNECT request in clear text first:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"$ wget --no-check-certificate --debug --verbose -e use_proxy=on -e https_proxy=localhost:3128 https://google.com\"\u003e\u003cpre\u003e$ wget --no-check-certificate --debug --verbose -e use_proxy=on -e https_proxy=localhost:3128 https://google.com\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLimtations and Common Compilation Errors\u003c/h3\u003e\u003ca id=\"user-content-limtations-and-common-compilation-errors\" class=\"anchor\" aria-label=\"Permalink: Limtations and Common Compilation Errors\" href=\"#limtations-and-common-compilation-errors\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eIntel SGX does not support the fork system call. Therefore neither the\nmulti-processes version of Nginx nor the prefork module of Apache can be\nused.\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eapplication/source_file.c:\u003c/code\u003e undefined reference to \u003ccode\u003eSSL_function\u003c/code\u003e: this\nerror happens when the untrusted library of TaLoS does not export the symbol\n\u003ccode\u003eSSL_function\u003c/code\u003e. To fix this, you need to add the definition of the function\nin \u003ccode\u003eenclaveshim_ecalls.c\u003c/code\u003e and its declaration in \u003ccode\u003eenclaveshim_ecalls.h\u003c/code\u003e:\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-c notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// we assume the following prototype for SSL_function:\nint SSL_function(SSL* ssl, void* args) {\n fprintf(stderr, \u0026quot;%s:%i need to implement ecall %s\\n\u0026quot;, __FILE__, __LINE__, __func__);\n return 0;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e// we assume the following prototype for SSL_function:\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eSSL_function\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003essl\u003c/span\u003e, \u003cspan class=\"pl-smi\"\u003evoid\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eargs\u003c/span\u003e) {\n \u003cspan class=\"pl-en\"\u003efprintf\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003estderr\u003c/span\u003e, \u003cspan class=\"pl-s\"\u003e\"%s:%i need to implement ecall %s\\n\"\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e__FILE__\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e__LINE__\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e__func__\u003c/span\u003e);\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ewhen compiling Apache you might encounter the following warning. In addition,\nApache might fail to load the SSL module because the \u003ccode\u003eRAND_egd\u003c/code\u003e function is not\ndefined. This is due to the configure step that uses the system OpenSSL headers\ninstead of TaLoS ones. To fix this, you need to undefine the \u003ccode\u003eHAVE_RAND_EGD\u003c/code\u003e\nmacro in \u003ccode\u003ehttp-2.4.23/include/ap_config_auto.h\u003c/code\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"highlight highlight-source-c notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"ssl_engine_rand.c: In function 'ssl_rand_seed':\nssl_engine_rand.c:90:26: warning: implicit declaration of function 'RAND_egd' [-Wimplicit-function-declaration]\n if ((n = RAND_egd(pRandSeed-\u0026gt;cpPath)) == -1)\"\u003e\u003cpre\u003e\u003cspan class=\"pl-s1\"\u003essl_engine_rand\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ec\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eIn\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e'ssl_rand_seed'\u003c/span\u003e:\n\u003cspan class=\"pl-s1\"\u003essl_engine_rand\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ec\u003c/span\u003e:\u003cspan class=\"pl-c1\"\u003e90\u003c/span\u003e:\u003cspan class=\"pl-c1\"\u003e26\u003c/span\u003e: \u003cspan class=\"pl-ent\"\u003ewarning\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eimplicit\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003edeclaration\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eof\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e'RAND_egd'\u003c/span\u003e [\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eWimplicit\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003efunction\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edeclaration\u003c/span\u003e]\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e ((\u003cspan class=\"pl-s1\"\u003en\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eRAND_egd\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003epRandSeed\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e-\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ecpPath\u003c/span\u003e)) \u003cspan class=\"pl-c1\"\u003e==\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e-1\u003c/span\u003e)\u003c/pre\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIn simulation mode and when compiling TaLoS as a shared library, Apache fails\nwith a call to \u003ccode\u003efree()\u003c/code\u003e inside the enclave when processing an HTTPS request.\nOther modes (static library and/or hardware mode) are not affected.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDocumentation\u003c/h2\u003e\u003ca id=\"user-content-documentation\" class=\"anchor\" aria-label=\"Permalink: Documentation\" href=\"#documentation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTaLoS Interface\u003c/h3\u003e\u003ca id=\"user-content-talos-interface\" class=\"anchor\" aria-label=\"Permalink: TaLoS Interface\" href=\"#talos-interface\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTaLoS exposes the same interface as LibreSSL. The functions of the interface\nare defined in \u003ccode\u003eenclaveshim_ecalls.c\u003c/code\u003e. This file also loads the enclave (ie\n\u003ccode\u003eenclave.signed.so\u003c/code\u003e) and makes the necessary ecalls, transitioning from\nuntrusted code to enclave code.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe functions of the interface follow a common schema:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;type\u0026gt; function(\u0026lt;arguments\u0026gt;) {\n type retval = 0;\n log_enter_ecall(__func__);\n\n sgx_status_t ret = SGX_ERROR_UNEXPECTED;\n ret = ecall_function(global_eid, \u0026amp;retval, \u0026lt;arguments\u0026gt;);\n if (ret != SGX_SUCCESS) {\n print_error_message(ret, __func__);\n return \u0026lt;error_code\u0026gt;; // generally 0, -1 or NULL\n }\n\n log_exit_ecall(__func__);\n return retval;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003etype\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003efunction\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003earguments\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e) {\n \u003cspan class=\"pl-smi\"\u003etype\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eretval\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n \u003cspan class=\"pl-en\"\u003elog_enter_ecall\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e__func__\u003c/span\u003e);\n\n \u003cspan class=\"pl-smi\"\u003esgx_status_t\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eSGX_ERROR_UNEXPECTED\u003c/span\u003e;\n \u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eecall_function\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eglobal_eid\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e\u0026amp;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eretval\u003c/span\u003e, \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003earguments\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e);\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e (\u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e!=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eSGX_SUCCESS\u003c/span\u003e) {\n \u003cspan class=\"pl-en\"\u003eprint_error_message\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003e__func__\u003c/span\u003e);\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eerror_code\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e; \u003cspan class=\"pl-c\"\u003e// generally 0, -1 or NULL\u003c/span\u003e\n }\n\n \u003cspan class=\"pl-en\"\u003elog_exit_ecall\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003e__func__\u003c/span\u003e);\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eretval\u003c/span\u003e;\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003elog_enter_ecall()\u003c/code\u003e and \u003ccode\u003elog_exit_ecall()\u003c/code\u003e functions are defined in\n\u003ccode\u003eenclaveshim_log.h\u003c/code\u003e. If the \u003ccode\u003eLOG_ENCLAVE_ENTER_EXIT\u003c/code\u003e macro is defined, a printf\nwill be issued with the current time and the called function for every ecall\nand ocall for debugging.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eecall_function()\u003c/code\u003e function is defined in \u003ccode\u003eenclave.edl\u003c/code\u003e. Refer to the Intel\nSGX SDK syntax for its format. It is also defined in libreSSL code near the\ndefinition of \u003ccode\u003efunction()\u003c/code\u003e. While \u003ccode\u003eecall_function()\u003c/code\u003e is the entry point of the\nenclave, \u003ccode\u003efunction()\u003c/code\u003e is the actual function of the TLS library. For example,\nin \u003ccode\u003essl/ssl_lib.c\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"ecall_SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,\n unsigned int sid_ctx_len) {\n return SSL_CTX_set_session_id_context(ctx, sid_ctx, sid_ctx_len);\n}\nint\nSSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,\n unsigned int sid_ctx_len)\n{\n ...\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-en\"\u003eecall_SSL_CTX_set_session_id_context\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003eSSL_CTX\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ectx\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003echar\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esid_ctx\u003c/span\u003e,\n \u003cspan class=\"pl-s1\"\u003eunsigned\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esid_ctx_len\u003c/span\u003e) {\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eSSL_CTX_set_session_id_context\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ectx\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003esid_ctx\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003esid_ctx_len\u003c/span\u003e);\n}\n\u003cspan class=\"pl-smi\"\u003eint\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eSSL_CTX_set_session_id_context\u003c/span\u003e(\u003cspan class=\"pl-smi\"\u003eSSL_CTX\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ectx\u003c/span\u003e, \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eunsigned \u003cspan class=\"pl-smi\"\u003echar\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esid_ctx\u003c/span\u003e,\n \u003cspan class=\"pl-smi\"\u003eunsigned \u003cspan class=\"pl-smi\"\u003eint\u003c/span\u003e\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esid_ctx_len\u003c/span\u003e)\n{\n ...\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOcalls, ie transitions from enclave code to untrusted code, are defined in a\nsimilar way in \u003ccode\u003eenclaveshim_ocalls.c\u003c/code\u003e (code executed inside the enclave) and\n\u003ccode\u003eocalls.c\u003c/code\u003e (code executed outside of the enclave).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf an interface function does not have an associated ecall, it prints a \u003ccode\u003eneed to implement ecall ...\u003c/code\u003e message.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSecure processing of TLS communications\u003c/h3\u003e\u003ca id=\"user-content-secure-processing-of-tls-communications\" class=\"anchor\" aria-label=\"Permalink: Secure processing of TLS communications\" href=\"#secure-processing-of-tls-communications\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTaLoS can be used to build other systems that need to process the TLS communication in a secure manner, inside an SGX enclave. The interface consists of a set of private functions, called by LibreSSL, and public functions, used by your TLS processing module to register callbacks. These callbacks are called by the \"private\" functions.\nThe public interface is the following:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003evoid tls_processing_register_ssl_read_processing_cb(void (*cb)(const SSL*, char*, unsigned int))\u003c/code\u003e: register the callback that will be called by \u003ccode\u003essl3_read_bytes()\u003c/code\u003e in \u003ccode\u003essl/s3_pkt.c\u003c/code\u003e when data is read from the TLS connection socket;\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003evoid tls_processing_register_ssl_write_processing_cb(void (*cb)(const SSL*, char*, unsigned int))\u003c/code\u003e: register the callback that will be called by \u003ccode\u003edo_ssl3_write()\u003c/code\u003e in \u003ccode\u003essl/s3_pkt.c\u003c/code\u003e when data is read from the TLS connection socket;\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003evoid tls_processing_register_set_ssl_type_cb(void (*cb)(const void*, const long))\u003c/code\u003e: register the callback that will be called by \u003ccode\u003eBIO_int_ctrl()\u003c/code\u003e when the command is \u003ccode\u003eBIO_C_SET_FD\u003c/code\u003e. This callback is used for Squid in SSL proxy mode to differentiate the connection between the client and the proxy from the connection between the proxy and the server;\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003evoid tls_processing_register_new_connection_cb(void (*cb)(const SSL*))\u003c/code\u003e: register the callback that will be called from \u003ccode\u003eSSL_new()\u003c/code\u003e in \u003ccode\u003essl/ssl_lib.c\u003c/code\u003e when a new TLS connection is created;\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003evoid tls_processing_register_free_connection_cb(void (*cb)(const SSL*))\u003c/code\u003e: register the callback that will be called from \u003ccode\u003eSSL_free()\u003c/code\u003e in \u003ccode\u003essl/ssl_lib.c\u003c/code\u003e when a TLS connection is terminated.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIn addition, your TLS processing module must implement the \u003ccode\u003evoid tls_processing_module_init(void)\u003c/code\u003e, which is called upon the enclave creation. In this function you can register the callbacks and initialise your code.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe callbacks registered for \u003ccode\u003etls_processing_register_ssl_read_processing_cb()\u003c/code\u003e and \u003ccode\u003etls_processing_register_ssl_write_processing_cb()\u003c/code\u003e can not only read the data buffer but also modify it in place. This can for example be used to ensure that an application calling \u003ccode\u003eSSL_read()\u003c/code\u003e does not observe sensitive data that goes through the TLS connection.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe file \u003ccode\u003elogpoint.c\u003c/code\u003e is a minimal example of a TLS processing module that uses this interface to log the TLS communications. To enable it, please define the \u003ccode\u003eDO_LOGGING\u003c/code\u003e macro in \u003ccode\u003elogpoint.c\u003c/code\u003e.\nThe Makefiles define a variable \u003ccode\u003eTLSPROCESSINGMODULE\u003c/code\u003e which lists the files that need to be compiled for your module.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote that, because TaLoS cannot load existing shared libraries inside an enclave, a recompilation of TaLoS is necessary to use a different module.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAsynchronous Enclave Transitions\u003c/h3\u003e\u003ca id=\"user-content-asynchronous-enclave-transitions\" class=\"anchor\" aria-label=\"Permalink: Asynchronous Enclave Transitions\" href=\"#asynchronous-enclave-transitions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo reduce the cost of enclave transitions, it is possible to activate the\nasynchronous queue. Instead of threads entering and exiting the enclave,\nuser-level tasks, implemented by the \u003ca href=\"https://github.com/halayli/lthread\"\u003elthread\u003c/a\u003e library inside the enclave,\nperform call executions.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eApplications threads share two arrays with the lthread tasks to send ecalls and\nocalls requests and results. These arrays are defined at lines 206 and 207 of\n\u003ccode\u003eenclaveshim_ecalls.c\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo add an ecall/ocall to the asynchronous queue, you need to:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003emodify \u003ccode\u003emake_asynchronous_ecall\u003c/code\u003e in \u003ccode\u003eenclaveshim_ecalls.c\u003c/code\u003e to enqueue your\nasync ecall and wait for the result or any ocall to execute;\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003emodify your interface function in \u003ccode\u003eenclaveshim_ecalls.c\u003c/code\u003e to create the async\necall with the necessary arguments and read the result (see \u003ccode\u003eSSL_read()\u003c/code\u003e line\n545 for an example);\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003eadd your new ecall (or ocall) type in \u003ccode\u003eecall_queue.h\u003c/code\u003e;\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003ecreate a new function in \u003ccode\u003eenclaveshim_ocalls.h\u003c/code\u003e to make an asynchronous ocall;\u003c/p\u003e\n\u003c/li\u003e\n\u003cli\u003e\n\u003cp dir=\"auto\"\u003emodify \u003ccode\u003elthread_main_handler()\u003c/code\u003e in \u003ccode\u003e../ssl/ssl_lib.c\u003c/code\u003e to read your ecall from\nthe ecall queue and execute the corresponding function.\u003c/p\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eShadow Data Structure Mechanism\u003c/h3\u003e\u003ca id=\"user-content-shadow-data-structure-mechanism\" class=\"anchor\" aria-label=\"Permalink: Shadow Data Structure Mechanism\" href=\"#shadow-data-structure-mechanism\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTaLoS uses shadow structures to protect the security and integrity of the SSL\nobject. It maintains a sanitised copy of the SSL structure outside the enclave,\nwith all sensitive data removed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe association between the enclave structure and the shadow structure is\nstored in a hashmap inside the enclave.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTaLoS synchronises the two SSL structures at ecalls and ocalls, as shown in the\nlisting below:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"BIO* ecall_SSL_get_wbio(const SSL *s)\n{\n SSL* out_s = (SSL*)s;\n\n // retrieve the in-enclave structure from the hashmap\n sgx_spin_lock(\u0026amp;ssl_hardening_map_lock);\n SSL* in_s = (SSL*) hashmapGet(ssl_hardening_map, (unsigned long)out_s);\n sgx_spin_unlock(\u0026amp;ssl_hardening_map_lock);\n\n // copy fields from out structure to in structure\n SSL_copy_fields_to_in_struct(in_s, out_s);\n\n // execute the TLS function by passing it a pointer to the in structure\n BIO* ret = SSL_get_wbio((const SSL*)in_s);\n\n // copy fields form in structure to out structure\n SSL_copy_fields_to_out_struct(in_s, out_s);\n\n return ret;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-smi\"\u003eBIO\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eecall_SSL_get_wbio\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e)\n{\n \u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eout_s\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e (\u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e)\u003cspan class=\"pl-s1\"\u003es\u003c/span\u003e;\n\n \u003cspan class=\"pl-c\"\u003e// retrieve the in-enclave structure from the hashmap\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003esgx_spin_lock\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e\u0026amp;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003essl_hardening_map_lock\u003c/span\u003e);\n \u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ein_s\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e (\u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e) \u003cspan class=\"pl-en\"\u003ehashmapGet\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003essl_hardening_map\u003c/span\u003e, (\u003cspan class=\"pl-smi\"\u003eunsigned long\u003c/span\u003e)\u003cspan class=\"pl-s1\"\u003eout_s\u003c/span\u003e);\n \u003cspan class=\"pl-en\"\u003esgx_spin_unlock\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e\u0026amp;\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003essl_hardening_map_lock\u003c/span\u003e);\n\n \u003cspan class=\"pl-c\"\u003e// copy fields from out structure to in structure\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eSSL_copy_fields_to_in_struct\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ein_s\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eout_s\u003c/span\u003e);\n\n \u003cspan class=\"pl-c\"\u003e// execute the TLS function by passing it a pointer to the in structure\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003eBIO\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eSSL_get_wbio\u003c/span\u003e((\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eSSL\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e)\u003cspan class=\"pl-s1\"\u003ein_s\u003c/span\u003e);\n\n \u003cspan class=\"pl-c\"\u003e// copy fields form in structure to out structure\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eSSL_copy_fields_to_out_struct\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003ein_s\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003eout_s\u003c/span\u003e);\n\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eret\u003c/span\u003e;\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSecure Callbacks\u003c/h3\u003e\u003ca id=\"user-content-secure-callbacks\" class=\"anchor\" aria-label=\"Permalink: Secure Callbacks\" href=\"#secure-callbacks\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSeveral API functions permit the application to submit function pointers. As\nTaLoS executes inside an SGX enclave, it must trigger an ocall before calling\nsuch functions. To address this problem, we create wrapper functions. See\n\u003ccode\u003ebio/bio_lib.c\u003c/code\u003e for more details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReferences\u003c/h2\u003e\u003ca id=\"user-content-references\" class=\"anchor\" aria-label=\"Permalink: References\" href=\"#references\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-talosfootnote\"\u003e1\u003c/a\u003e: \"In Greek mythology, Talos was a giant automaton made of bronze to protect\nEuropa in Crete from pirates and invaders.\", \u003ca href=\"https://en.wikipedia.org/wiki/Talos\" rel=\"nofollow\"\u003ehttps://en.wikipedia.org/wiki/Talos\u003c/a\u003e\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"TaLoS: Efficient TLS Termination Inside SGX Enclaves for Existing Applications","anchor":"talos-efficient-tls-termination-inside-sgx-enclaves-for-existing-applications","htmlText":"TaLoS: Efficient TLS Termination Inside SGX Enclaves for Existing Applications"},{"level":2,"text":"Quick set-up using Docker","anchor":"quick-set-up-using-docker","htmlText":"Quick set-up using Docker"},{"level":2,"text":"Manual Installation","anchor":"manual-installation","htmlText":"Manual Installation"},{"level":3,"text":"Compiling the TaLoS Library","anchor":"compiling-the-talos-library","htmlText":"Compiling the TaLoS Library"},{"level":3,"text":"Using TaLoS with Nginx","anchor":"using-talos-with-nginx","htmlText":"Using TaLoS with Nginx"},{"level":3,"text":"Using TaLoS with Apache","anchor":"using-talos-with-apache","htmlText":"Using TaLoS with Apache"},{"level":3,"text":"Using TaLoS with Squid","anchor":"using-talos-with-squid","htmlText":"Using TaLoS with Squid"},{"level":3,"text":"Limtations and Common Compilation Errors","anchor":"limtations-and-common-compilation-errors","htmlText":"Limtations and Common Compilation Errors"},{"level":2,"text":"Documentation","anchor":"documentation","htmlText":"Documentation"},{"level":3,"text":"TaLoS Interface","anchor":"talos-interface","htmlText":"TaLoS Interface"},{"level":3,"text":"Secure processing of TLS communications","anchor":"secure-processing-of-tls-communications","htmlText":"Secure processing of TLS communications"},{"level":3,"text":"Asynchronous Enclave Transitions","anchor":"asynchronous-enclave-transitions","htmlText":"Asynchronous Enclave Transitions"},{"level":3,"text":"Shadow Data Structure Mechanism","anchor":"shadow-data-structure-mechanism","htmlText":"Shadow Data Structure Mechanism"},{"level":3,"text":"Secure Callbacks","anchor":"secure-callbacks","htmlText":"Secure Callbacks"},{"level":2,"text":"References","anchor":"references","htmlText":"References"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Flsds%2FTaLoS"}},{"displayName":"LICENSE","repoName":"TaLoS","refName":"master","path":"LICENSE","preferredFileType":"license","tabName":"License","richText":null,"loaded":false,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":null,"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Flsds%2FTaLoS"}}],"overviewFilesProcessingTime":0}},"appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-708ec8ade250.js","githubDevUrl":null,"enabled_features":{"copilot_workspace":null,"code_nav_ui_events":false,"overview_shared_code_dropdown_button":true,"react_blob_overlay":false,"accessible_code_button":true,"github_models_repo_integration":false}}}}</script> <div 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style="vertical-align:text-bottom"><path d="m11.28 3.22 4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734L13.94 8l-3.72-3.72a.749.749 0 0 1 .326-1.275.749.749 0 0 1 .734.215Zm-6.56 0a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042L2.06 8l3.72 3.72a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L.47 8.53a.75.75 0 0 1 0-1.06Z"></path></svg></span><span data-component="text" class="prc-Button-Label-pTQ3x">Code</span><span data-component="trailingVisual" class="prc-Button-Visual-2epfX prc-Button-VisualWrap-Db-eB"><svg aria-hidden="true" focusable="false" class="octicon octicon-triangle-down" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path></svg></span></span></button><div class="Box-sc-g0xbh4-0 izFOf"><button 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ScreenReaderHeading-module__userSelectNone--vW4Cq prc-Heading-Heading-6CmGO" data-testid="screen-reader-heading" id="folders-and-files">Folders and files</h2><table aria-labelledby="folders-and-files" class="Box-sc-g0xbh4-0 fdROMU"><thead class="Box-sc-g0xbh4-0 jGKpsv"><tr class="Box-sc-g0xbh4-0 jdgHnn"><th colSpan="2" class="Box-sc-g0xbh4-0 bQivRW"><span class="text-bold">Name</span></th><th colSpan="1" class="Box-sc-g0xbh4-0 ldkMIO"><span class="text-bold">Name</span></th><th class="hide-sm"><div title="Last commit message" class="Truncate__StyledTruncate-sc-23o1d2-0 liVpTx width-fit"><span class="text-bold">Last commit message</span></div></th><th colSpan="1" class="Box-sc-g0xbh4-0 jMbWeI"><div title="Last commit date" class="Truncate__StyledTruncate-sc-23o1d2-0 liVpTx width-fit"><span class="text-bold">Last commit date</span></div></th></tr></thead><tbody><tr class="Box-sc-g0xbh4-0 gpqjiB"><td colSpan="3" class="bgColor-muted p-1 rounded-top-2"><div class="Box-sc-g0xbh4-0 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itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">TaLoS: Efficient TLS Termination Inside SGX Enclaves for Existing Applications</h1><a id="user-content-talos-efficient-tls-termination-inside-sgx-enclaves-for-existing-applications" class="anchor" aria-label="Permalink: TaLoS: Efficient TLS Termination Inside SGX Enclaves for Existing Applications" href="#talos-efficient-tls-termination-inside-sgx-enclaves-for-existing-applications"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">TaLoS<sup><a href="#talosfootnote">1</a></sup> is a TLS library that allows existing applications (with an OpenSSL/LibreSSL interface) to securely terminate their TLS connection. For this, TaLoS places security-sensistive code and data of the TLS library inside an <a href="https://software.intel.com/sgx-sdk" rel="nofollow">Intel SGX enclave</a>, while the rest of the application remains outside. It can then be used as the building block for a wide range of security-critical applications for which the integrity and/or confidentiality of TLS connections must be guaranteed. TaLoS offers the developper a <a href="#secure-processing-of-tls-communications">simple interface</a> to process TLS communications securely. For example, this interface can be used to securely send the HTTPS requests and responses to another enclave or to encrypt them before logging them to persistent storage. TaLoS provides good performance by executing enclave transitions asynchronously and leveraging user-level threading inside the enclave.</p> <p dir="auto">The code is accompanied with a <a href="https://www.doc.ic.ac.uk/research/technicalreports/2017/DTRS17-5.pdf" rel="nofollow">technical report</a>, containing details about the architecture and performance results.</p> <p dir="auto">In contrast to the <a href="https://software.intel.com/en-us/sgx-sdk/download" rel="nofollow">SSL add-on for the Intel SGX SDK</a>, TaLoS exposes the OpenSSL/LibreSSL API to untrusted code outside of the enclave. This means that existing applications can use the TaLoS library with no or only minor modifications. The Intel SGX SDK SSL add-on does not expose an outside interface, which means that applications must be modified to use it.</p> <p dir="auto">The current implementation of TaLoS utilises libreSSL v2.4.1 and has been tested with the following applications under Linux:</p> <ul dir="auto"> <li> <p dir="auto"><a href="https://httpd.apache.org/" rel="nofollow">Apache web server</a> (v2.4.23);</p> </li> <li> <p dir="auto"><a href="http://nginx.org/" rel="nofollow">Nginx web server</a> (v1.11.0);</p> </li> <li> <p dir="auto"><a href="http://www.squid-cache.org/" rel="nofollow">Squid proxy</a> (v3.5.23).</p> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Quick set-up using Docker</h2><a id="user-content-quick-set-up-using-docker" class="anchor" aria-label="Permalink: Quick set-up using Docker" href="#quick-set-up-using-docker"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">We provide a Dockerfile that is configured to run Apache with TaLoS and the SGX simulator. The Dockerfile can be found in the root folder of this repository. To use it:</p> <ul dir="auto"> <li> <p dir="auto">Clone the repository</p> </li> <li> <p dir="auto">Build the TaLoS Docker image by running <code>docker build -t talos .</code> from within the root directory of the repository</p> </li> <li> <p dir="auto">Run Apache with TaLoS by running the Docker image: <code>docker run -dt -p 7778:7778 talos /start.sh</code></p> </li> <li> <p dir="auto">Verify that Apache is running: <code>wget --no-check-certificate https://localhost:7778/index.html</code></p> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Manual Installation</h2><a id="user-content-manual-installation" class="anchor" aria-label="Permalink: Manual Installation" href="#manual-installation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Follow these instructions to build the TaLoS library and the sample applications. We assume that the path to the repository is <code>${PROJECT_ROOT}</code> (eg <code>/home/<username>/talos/</code>).</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Compiling the TaLoS Library</h3><a id="user-content-compiling-the-talos-library" class="anchor" aria-label="Permalink: Compiling the TaLoS Library" href="#compiling-the-talos-library"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The source code specific to TaLoS can be found in <code>${PROJECT_ROOT}/src/talos</code> while the original code of libreSSL is in <code>${PROJECT_ROOT}/src/libressl-2.4.1</code>.</p> <p dir="auto">To patch libreSSL, you need to execute:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cd ${PROJECT_ROOT}/src/talos $ ./patch_libressl.sh"><pre>$ <span class="pl-c1">cd</span> <span class="pl-smi">${PROJECT_ROOT}</span>/src/talos $ ./patch_libressl.sh</pre></div> <p dir="auto">To compile TaLos, go to the <code>${PROJECT_ROOT}/src/libressl-2.4.1/crypto</code> directory and edit the <code>enclaveshim_config.h</code> file. In particular, you need to undefine <code>COMPILE_OPTIMISATION_FOR_APACHE</code> when compiling TaLoS for Squid or Nginx. Afer that, execute one of the following lines:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ make -f Makefile.nosgx # no SGX $ make -f Makefile.sgx # SGX, simulator mode $ SGX_PRERELEASE=1 SGX_MODE=HW make -f Makefile.sgx # SGX, real hardware mode"><pre>$ make -f Makefile.nosgx <span class="pl-c"><span class="pl-c">#</span> no SGX</span> $ make -f Makefile.sgx <span class="pl-c"><span class="pl-c">#</span> SGX, simulator mode</span> $ SGX_PRERELEASE=1 SGX_MODE=HW make -f Makefile.sgx <span class="pl-c"><span class="pl-c">#</span> SGX, real hardware mode</span></pre></div> <p dir="auto">This creates three files:</p> <ul dir="auto"> <li> <p dir="auto"><code>libenclave.so</code> and <code>libenclave.a</code> are the untrusted libraries that link against the application. The Makefile generates both a static and shared versions, but you should use only one of them, depending on your application.</p> </li> <li> <p dir="auto">The trusted library, which executes inside an SGX enclave, is <code>enclave.signed.so</code>. The code expects this library to be present in the current directory when launching the application. The easiest way to ensure this is to create a symbolic link, as shown in the next sections.</p> </li> </ul> <p dir="auto">Finally, several symbolic links to the untrusted TaLoS library file have to be created in <code>${PROJECT_ROOT}/src/libressl-2.4.1/lib</code> :</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="make -f Makefile.nosgx install # without SGX make -f Makefile.sgx install # with SGX, simulator or hardware mode"><pre>make -f Makefile.nosgx install <span class="pl-c"><span class="pl-c">#</span> without SGX</span> make -f Makefile.sgx install <span class="pl-c"><span class="pl-c">#</span> with SGX, simulator or hardware mode</span></pre></div> <p dir="auto">Note that, since the SGX SDK v2.0, the SDK libraries make calls to OpenSSL in simulation mode to emulate cryptographic functions that would normally happen inside the enclave. However, as TaLoS replaces OpenSSL this creates a conflict (see <a href="https://github.com/lsds/TaLoS/issues/12" data-hovercard-type="issue" data-hovercard-url="/lsds/TaLoS/issues/12/hovercard">issue #12</a>). TaLoS, when created in simulation mode, separately loads the system OpenSSL library. The path is defined by the <code>OPENSSL_LIBRARY_PATH</code> macro in <code>enclaveshim_config.h</code>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Using TaLoS with Nginx</h3><a id="user-content-using-talos-with-nginx" class="anchor" aria-label="Permalink: Using TaLoS with Nginx" href="#using-talos-with-nginx"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">First, download Nginx v1.11.0:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="wget http://nginx.org/download/nginx-1.11.0.tar.gz"><pre>wget http://nginx.org/download/nginx-1.11.0.tar.gz</pre></div> <p dir="auto">We assume that you have downloaded and extracted Nginx to <code>${PROJECT_ROOT}/src/nginx-1.11.0</code>. You can then to run configure:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="./configure --prefix=${PROJECT_ROOT}/src/nginx-1.11.0/install --with-http_ssl_module --with-openssl=${PROJECT_ROOT}/src/libressl-2.4.1/"><pre>./configure --prefix=<span class="pl-smi">${PROJECT_ROOT}</span>/src/nginx-1.11.0/install --with-http_ssl_module --with-openssl=<span class="pl-smi">${PROJECT_ROOT}</span>/src/libressl-2.4.1/</pre></div> <p dir="auto">You then need to edit <code>objs/Makefile</code>:</p> <ol dir="auto"> <li> <p dir="auto">check that the path for the include directory of libressl is correct in <code>ALL_INCS</code> and <code>CORE_INCS</code>;</p> </li> <li> <p dir="auto">remove the <code>include/openssl/ssh.h</code> line in <code>CORE_DEPS</code> and the <code>include/openssl/ssh.h</code> rule (we have already compiled libressl);</p> </li> <li> <p dir="auto">in <code>objs/nginx</code>, for the LINK phase, update the following line with the correct path to <code>libssl.a</code> and <code>libcrypto.a</code> and add <code>-lsgx_urts -lsgx_uae_service</code>. Depending on how you compiled TaLoS, you may want to change <code>-lsgx_urts -lsgx_uae_service</code> (real hardware) to <code>-lsgx_urts_sim -lsgx_uae_service_sim</code> (simulator).</p> </li> </ol> <p dir="auto">The code is ready to be compiled:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ make $ make install"><pre>$ make $ make install</pre></div> <p dir="auto">Before starting the server, you need to copy the Nginx configuration from <code>${PROJECT_ROOT}/conf/nginx/</code> to <code>install/conf</code>, create your own TLS certificate and associated keys, and change the paths in <code>install/conf/nginx.conf</code> to reflect the location where you cloned TaLoS:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cp ${PROJECT_ROOT}/conf/nginx/* install/conf/ $ sed -i 's#/home/talos/talos#${PROJECT_ROOT}#' install/conf/nginx.conf $ echo "\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n" | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/nginx-1.11.0/install/conf/cert.key -out ${PROJECT_ROOT}/src/nginx-1.11.0/install/conf/cert.crt $ ln -s ../libressl-2.4.1/crypto/enclave.signed.so"><pre>$ cp <span class="pl-smi">${PROJECT_ROOT}</span>/conf/nginx/<span class="pl-k">*</span> install/conf/ $ sed -i <span class="pl-s"><span class="pl-pds">'</span>s#/home/talos/talos#${PROJECT_ROOT}#<span class="pl-pds">'</span></span> install/conf/nginx.conf $ <span class="pl-c1">echo</span> <span class="pl-s"><span class="pl-pds">"</span>\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n<span class="pl-pds">"</span></span> <span class="pl-k">|</span> openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout <span class="pl-smi">${PROJECT_ROOT}</span>/src/nginx-1.11.0/install/conf/cert.key -out <span class="pl-smi">${PROJECT_ROOT}</span>/src/nginx-1.11.0/install/conf/cert.crt $ ln -s ../libressl-2.4.1/crypto/enclave.signed.so</pre></div> <p dir="auto">To start Nginx (<code>LD_LIBRARY_PATH</code> is needed only if you use the TaLoS shared library):</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$(pwd)/../libressl-2.4.1/lib ./objs/nginx"><pre>$ LD_LIBRARY_PATH=<span class="pl-smi">${LD_LIBRARY_PATH}</span>:<span class="pl-s"><span class="pl-pds">$(</span>pwd<span class="pl-pds">)</span></span>/../libressl-2.4.1/lib ./objs/nginx</pre></div> <p dir="auto">You should be able to access the web pages with:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ wget --no-check-certificate https://localhost:7778/index.html"><pre>$ wget --no-check-certificate https://localhost:7778/index.html</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Using TaLoS with Apache</h3><a id="user-content-using-talos-with-apache" class="anchor" aria-label="Permalink: Using TaLoS with Apache" href="#using-talos-with-apache"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">First, download Apache v2.4.23:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="wget http://archive.apache.org/dist/httpd/httpd-2.4.23.tar.bz2"><pre>wget http://archive.apache.org/dist/httpd/httpd-2.4.23.tar.bz2</pre></div> <p dir="auto">We assume that you have extracted Apache to <code>${PROJECT_ROOT}/src/httpd-2.4.23</code>. You can now configure it:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ ./configure --prefix=${PROJECT_ROOT}/src/httpd-2.4.23/install --enable-http --enable-proxy --enable-ssl --enable-ssl-staticlib-deps --with-ssl=${PROJECT_ROOT}/src/libressl-2.4.1 --enable-file-cache --enable-cache --enable-disk-cache --enable-mem-cache --enable-deflate --enable-expires --enable-headers --enable-usertrack --enable-cgi --enable-vhost-alias --enable-rewrite --enable-so --with-mpm=worker"><pre>$ ./configure --prefix=<span class="pl-smi">${PROJECT_ROOT}</span>/src/httpd-2.4.23/install --enable-http --enable-proxy --enable-ssl --enable-ssl-staticlib-deps --with-ssl=<span class="pl-smi">${PROJECT_ROOT}</span>/src/libressl-2.4.1 --enable-file-cache --enable-cache --enable-disk-cache --enable-mem-cache --enable-deflate --enable-expires --enable-headers --enable-usertrack --enable-cgi --enable-vhost-alias --enable-rewrite --enable-so --with-mpm=worker</pre></div> <p dir="auto">You then need to update <code>modules/ssl/modules.mk</code> as follows (you may want to change <code>-lsgx_urts -lsgx_uae_service</code> to <code>-lsgx_urts_sim -lsgx_uae_service_sim</code> to use the SGX simulator; note that you need to expand the ${PROJECT_ROOT} variable in this file):</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="MOD_CFLAGS = -I${PROJECT_ROOT}/src/libressl-2.4.1/include MOD_LDFLAGS = -L${PROJECT_ROOT}/src/libressl-2.4.1/lib -lssl -lcrypto -ldl -luuid -lrt -lcrypt -lpthread -lsgx_urts -lsgx_uae_service"><pre>MOD_CFLAGS = -I<span class="pl-smi">${PROJECT_ROOT}</span>/src/libressl-2.4.1/include MOD_LDFLAGS = -L<span class="pl-smi">${PROJECT_ROOT}</span>/src/libressl-2.4.1/lib -lssl -lcrypto -ldl -luuid -lrt -lcrypt -lpthread -lsgx_urts -lsgx_uae_service</pre></div> <p dir="auto">To work properly with TaLoS, Apache requires the <code>COMPILE_OPTIMISATION_FOR_APACHE</code> macro in <code>enclaveshim_config.h</code> to be defined. If this is not the case, then you will first need to define it and compile TaLoS again.</p> <p dir="auto">Apache is now ready to be compiled and installed:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ make $ make install"><pre>$ make $ make install</pre></div> <p dir="auto">The configuration to use Apache with HTTPS can be found in <code>${PROJECT_ROOT}/conf/apache/</code>. You need to copy the content of this directory to <code>install/conf/</code> and edit it to reflect your configuration. You may want to change the user and group to run httpd as well as the <code>/talos</code> path. You also need to create your own TLS certificate and associated keys:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ echo "\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n" | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/httpd-2.4.23/install/conf/cert.key -out ${PROJECT_ROOT}/src/httpd-2.4.23/install/conf/cert.crt $ ln -s ../libressl-2.4.1/crypto/enclave.signed.so"><pre>$ <span class="pl-c1">echo</span> <span class="pl-s"><span class="pl-pds">"</span>\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n<span class="pl-pds">"</span></span> <span class="pl-k">|</span> openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout <span class="pl-smi">${PROJECT_ROOT}</span>/src/httpd-2.4.23/install/conf/cert.key -out <span class="pl-smi">${PROJECT_ROOT}</span>/src/httpd-2.4.23/install/conf/cert.crt $ ln -s ../libressl-2.4.1/crypto/enclave.signed.so</pre></div> <p dir="auto">Before starting Apache, you need to create the following symbolic links:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so $ ln -s ../../../libressl-2.4.1/lib/libssl.so install/lib/libssl.so $ ln -s ../../../libressl-2.4.1/lib/libcrypto.so install/lib/libcrypto.so"><pre>$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so $ ln -s ../../../libressl-2.4.1/lib/libssl.so install/lib/libssl.so $ ln -s ../../../libressl-2.4.1/lib/libcrypto.so install/lib/libcrypto.so</pre></div> <p dir="auto">Finally, you can use the following command to start Apache:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ ./install/bin/httpd -X #-> only 1 process, no fork"><pre>$ ./install/bin/httpd -X <span class="pl-c"><span class="pl-c">#</span>-> only 1 process, no fork</span></pre></div> <p dir="auto">You can access web pages with:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ wget --no-check-certificate https://localhost:7778/index.html"><pre>$ wget --no-check-certificate https://localhost:7778/index.html</pre></div> <p dir="auto">Note that, by default, TaLoS is compiled for 50 concurrent threads inside the enclave (see <code>TCSNum</code> in <code>enclave.config.xml</code>) while Apache might use hundreds of threads (see the worker module options in <code>http-2.4.23/install/config/extra/http-mpm.conf</code>). You might want to make these numbers consistent.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Using TaLoS with Squid</h3><a id="user-content-using-talos-with-squid" class="anchor" aria-label="Permalink: Using TaLoS with Squid" href="#using-talos-with-squid"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">First, download Squid v3.5.23:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="wget http://www.squid-cache.org/Versions/v3/3.5/squid-3.5.23.tar.gz"><pre>wget http://www.squid-cache.org/Versions/v3/3.5/squid-3.5.23.tar.gz</pre></div> <p dir="auto">We assume that you have downloaded and extracted the code to <code>${PROJECT_ROOT}/src/squid-3.5.23</code>. You first need to configure it:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="$ ./configure --prefix=${PROJECT_ROOT}/src/squid-3.5.23/install --disable-shared --enable-static --enable-silent-rules --enable-dependency-tracking --enable-icmp --enable-delay-pools --enable-useragent-log --enable-esi --enable-follow-x-forwarded-for --enable-auth --with-openssl=/home/talos/talos/src/libressl-2.4.1 $ patch -p0 -i ${PROJECT_ROOT}/conf/squid/src.ssl.gadgets.cc.patch $ find . -name "Makefile" -exec sed --in-place 's/-lcrypto/-lcrypto -lsgx_urts -lsgx_uae_service -lpthread/' {} \; # as stated previously, add _sim if TaLoS has been compiled for the SGX simulator $ make && make install"><pre class="notranslate"><code>$ ./configure --prefix=${PROJECT_ROOT}/src/squid-3.5.23/install --disable-shared --enable-static --enable-silent-rules --enable-dependency-tracking --enable-icmp --enable-delay-pools --enable-useragent-log --enable-esi --enable-follow-x-forwarded-for --enable-auth --with-openssl=/home/talos/talos/src/libressl-2.4.1 $ patch -p0 -i ${PROJECT_ROOT}/conf/squid/src.ssl.gadgets.cc.patch $ find . -name "Makefile" -exec sed --in-place 's/-lcrypto/-lcrypto -lsgx_urts -lsgx_uae_service -lpthread/' {} \; # as stated previously, add _sim if TaLoS has been compiled for the SGX simulator $ make && make install </code></pre></div> <p dir="auto">To configure Squid, copy the content of <code>${PROJECT_ROOT}/conf/squid/</code> to <code>install/etc/</code>, update the configuration to reflect your installation and create your own TLS certificate and associated keys. This installation is configured to use the <code>ssl_bump</code> module to decrypt the HTTPS traffic.</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ cp ${PROJECT_ROOT}/conf/squid/* install/etc/ $ echo "\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n" | openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ${PROJECT_ROOT}/src/squid-3.5.23/install/etc/cert.key -out ${PROJECT_ROOT}/src/squid-3.5.23/install/etc/cert.crt"><pre>$ cp <span class="pl-smi">${PROJECT_ROOT}</span>/conf/squid/<span class="pl-k">*</span> install/etc/ $ <span class="pl-c1">echo</span> <span class="pl-s"><span class="pl-pds">"</span>\nABC\nMy City\nMy Institution\n\nwww.example.com\n\n<span class="pl-pds">"</span></span> <span class="pl-k">|</span> openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout <span class="pl-smi">${PROJECT_ROOT}</span>/src/squid-3.5.23/install/etc/cert.key -out <span class="pl-smi">${PROJECT_ROOT}</span>/src/squid-3.5.23/install/etc/cert.crt</pre></div> <p dir="auto">You also need to create a symbolic link to the enclave library:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so"><pre>$ ln -s ../libressl-2.4.1/crypto/enclave.signed.so</pre></div> <p dir="auto">To run Squid (<code>LD_LIBRARY_PATH</code> is needed only if you use TaLoS shared library):</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$(pwd)/../libressl-2.4.1/lib ./install/sbin/squid -CNd3 # -C: do not catch fatal signals # -N: no daemon mode (i.e., stays on foreground) # -d3 is to have some debugging messages"><pre>LD_LIBRARY_PATH=<span class="pl-smi">${LD_LIBRARY_PATH}</span>:<span class="pl-s"><span class="pl-pds">$(</span>pwd<span class="pl-pds">)</span></span>/../libressl-2.4.1/lib ./install/sbin/squid -CNd3 <span class="pl-c"><span class="pl-c">#</span> -C: do not catch fatal signals</span> <span class="pl-c"><span class="pl-c">#</span> -N: no daemon mode (i.e., stays on foreground)</span> <span class="pl-c"><span class="pl-c">#</span> -d3 is to have some debugging messages</span></pre></div> <p dir="auto">For testing, the port is 3128 in <code>https_proxy</code>, which corresponds to the http proxy port, as the client needs to send a CONNECT request in clear text first:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="$ wget --no-check-certificate --debug --verbose -e use_proxy=on -e https_proxy=localhost:3128 https://google.com"><pre>$ wget --no-check-certificate --debug --verbose -e use_proxy=on -e https_proxy=localhost:3128 https://google.com</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Limtations and Common Compilation Errors</h3><a id="user-content-limtations-and-common-compilation-errors" class="anchor" aria-label="Permalink: Limtations and Common Compilation Errors" href="#limtations-and-common-compilation-errors"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li> <p dir="auto">Intel SGX does not support the fork system call. Therefore neither the multi-processes version of Nginx nor the prefork module of Apache can be used.</p> </li> <li> <p dir="auto"><code>application/source_file.c:</code> undefined reference to <code>SSL_function</code>: this error happens when the untrusted library of TaLoS does not export the symbol <code>SSL_function</code>. To fix this, you need to add the definition of the function in <code>enclaveshim_ecalls.c</code> and its declaration in <code>enclaveshim_ecalls.h</code>:</p> </li> </ul> <div class="highlight highlight-source-c notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="// we assume the following prototype for SSL_function: int SSL_function(SSL* ssl, void* args) { fprintf(stderr, "%s:%i need to implement ecall %s\n", __FILE__, __LINE__, __func__); return 0; }"><pre><span class="pl-c">// we assume the following prototype for SSL_function:</span> <span class="pl-smi">int</span> <span class="pl-en">SSL_function</span>(<span class="pl-smi">SSL</span><span class="pl-c1">*</span> <span class="pl-s1">ssl</span>, <span class="pl-smi">void</span><span class="pl-c1">*</span> <span class="pl-s1">args</span>) { <span class="pl-en">fprintf</span>(<span class="pl-s1">stderr</span>, <span class="pl-s">"%s:%i need to implement ecall %s\n"</span>, <span class="pl-s1">__FILE__</span>, <span class="pl-s1">__LINE__</span>, <span class="pl-s1">__func__</span>); <span class="pl-k">return</span> <span class="pl-c1">0</span>; }</pre></div> <ul dir="auto"> <li>when compiling Apache you might encounter the following warning. In addition, Apache might fail to load the SSL module because the <code>RAND_egd</code> function is not defined. This is due to the configure step that uses the system OpenSSL headers instead of TaLoS ones. To fix this, you need to undefine the <code>HAVE_RAND_EGD</code> macro in <code>http-2.4.23/include/ap_config_auto.h</code>.</li> </ul> <div class="highlight highlight-source-c notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="ssl_engine_rand.c: In function 'ssl_rand_seed': ssl_engine_rand.c:90:26: warning: implicit declaration of function 'RAND_egd' [-Wimplicit-function-declaration] if ((n = RAND_egd(pRandSeed->cpPath)) == -1)"><pre><span class="pl-s1">ssl_engine_rand</span>.<span class="pl-c1">c</span>: <span class="pl-smi">In</span> <span class="pl-s1">function</span> <span class="pl-c1">'ssl_rand_seed'</span>: <span class="pl-s1">ssl_engine_rand</span>.<span class="pl-c1">c</span>:<span class="pl-c1">90</span>:<span class="pl-c1">26</span>: <span class="pl-ent">warning</span>: <span class="pl-smi">implicit</span> <span class="pl-s1">declaration</span> <span class="pl-smi">of</span> <span class="pl-s1">function</span> <span class="pl-c1">'RAND_egd'</span> [<span class="pl-c1">-</span><span class="pl-s1">Wimplicit</span><span class="pl-c1">-</span><span class="pl-s1">function</span><span class="pl-c1">-</span><span class="pl-s1">declaration</span>] <span class="pl-k">if</span> ((<span class="pl-s1">n</span> <span class="pl-c1">=</span> <span class="pl-en">RAND_egd</span>(<span class="pl-s1">pRandSeed</span><span class="pl-c1">-></span><span class="pl-c1">cpPath</span>)) <span class="pl-c1">==</span> <span class="pl-c1">-1</span>)</pre></div> <ul dir="auto"> <li>In simulation mode and when compiling TaLoS as a shared library, Apache fails with a call to <code>free()</code> inside the enclave when processing an HTTPS request. Other modes (static library and/or hardware mode) are not affected.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Documentation</h2><a id="user-content-documentation" class="anchor" aria-label="Permalink: Documentation" href="#documentation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">TaLoS Interface</h3><a id="user-content-talos-interface" class="anchor" aria-label="Permalink: TaLoS Interface" href="#talos-interface"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">TaLoS exposes the same interface as LibreSSL. The functions of the interface are defined in <code>enclaveshim_ecalls.c</code>. This file also loads the enclave (ie <code>enclave.signed.so</code>) and makes the necessary ecalls, transitioning from untrusted code to enclave code.</p> <p dir="auto">The functions of the interface follow a common schema:</p> <div class="highlight highlight-source-c notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<type> function(<arguments>) { type retval = 0; log_enter_ecall(__func__); sgx_status_t ret = SGX_ERROR_UNEXPECTED; ret = ecall_function(global_eid, &retval, <arguments>); if (ret != SGX_SUCCESS) { print_error_message(ret, __func__); return <error_code>; // generally 0, -1 or NULL } log_exit_ecall(__func__); return retval; }"><pre><span class="pl-c1"><</span><span class="pl-s1">type</span><span class="pl-c1">></span> <span class="pl-s1">function</span>(<span class="pl-c1"><</span><span class="pl-s1">arguments</span><span class="pl-c1">></span>) { <span class="pl-smi">type</span> <span class="pl-s1">retval</span> <span class="pl-c1">=</span> <span class="pl-c1">0</span>; <span class="pl-en">log_enter_ecall</span>(<span class="pl-s1">__func__</span>); <span class="pl-smi">sgx_status_t</span> <span class="pl-s1">ret</span> <span class="pl-c1">=</span> <span class="pl-c1">SGX_ERROR_UNEXPECTED</span>; <span class="pl-s1">ret</span> <span class="pl-c1">=</span> <span class="pl-en">ecall_function</span>(<span class="pl-s1">global_eid</span>, <span class="pl-c1">&</span><span class="pl-s1">retval</span>, <span class="pl-c1"><</span><span class="pl-s1">arguments</span><span class="pl-c1">></span>); <span class="pl-k">if</span> (<span class="pl-s1">ret</span> <span class="pl-c1">!=</span> <span class="pl-c1">SGX_SUCCESS</span>) { <span class="pl-en">print_error_message</span>(<span class="pl-s1">ret</span>, <span class="pl-s1">__func__</span>); <span class="pl-k">return</span> <span class="pl-c1"><</span><span class="pl-s1">error_code</span><span class="pl-c1">></span>; <span class="pl-c">// generally 0, -1 or NULL</span> } <span class="pl-en">log_exit_ecall</span>(<span class="pl-s1">__func__</span>); <span class="pl-k">return</span> <span class="pl-s1">retval</span>; }</pre></div> <p dir="auto">The <code>log_enter_ecall()</code> and <code>log_exit_ecall()</code> functions are defined in <code>enclaveshim_log.h</code>. If the <code>LOG_ENCLAVE_ENTER_EXIT</code> macro is defined, a printf will be issued with the current time and the called function for every ecall and ocall for debugging.</p> <p dir="auto">The <code>ecall_function()</code> function is defined in <code>enclave.edl</code>. Refer to the Intel SGX SDK syntax for its format. It is also defined in libreSSL code near the definition of <code>function()</code>. While <code>ecall_function()</code> is the entry point of the enclave, <code>function()</code> is the actual function of the TLS library. For example, in <code>ssl/ssl_lib.c</code>:</p> <div class="highlight highlight-source-c notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="ecall_SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx, unsigned int sid_ctx_len) { return SSL_CTX_set_session_id_context(ctx, sid_ctx, sid_ctx_len); } int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx, unsigned int sid_ctx_len) { ... }"><pre><span class="pl-en">ecall_SSL_CTX_set_session_id_context</span>(<span class="pl-c1">SSL_CTX</span> <span class="pl-c1">*</span><span class="pl-s1">ctx</span>, <span class="pl-s1">const</span> <span class="pl-s1">unsigned</span> <span class="pl-smi">char</span> <span class="pl-c1">*</span><span class="pl-s1">sid_ctx</span>, <span class="pl-s1">unsigned</span> <span class="pl-s1">int</span> <span class="pl-s1">sid_ctx_len</span>) { <span class="pl-k">return</span> <span class="pl-en">SSL_CTX_set_session_id_context</span>(<span class="pl-s1">ctx</span>, <span class="pl-s1">sid_ctx</span>, <span class="pl-s1">sid_ctx_len</span>); } <span class="pl-smi">int</span> <span class="pl-en">SSL_CTX_set_session_id_context</span>(<span class="pl-smi">SSL_CTX</span> <span class="pl-c1">*</span><span class="pl-s1">ctx</span>, <span class="pl-k">const</span> <span class="pl-smi">unsigned <span class="pl-smi">char</span></span> <span class="pl-c1">*</span><span class="pl-s1">sid_ctx</span>, <span class="pl-smi">unsigned <span class="pl-smi">int</span></span> <span class="pl-s1">sid_ctx_len</span>) { ... }</pre></div> <p dir="auto">Ocalls, ie transitions from enclave code to untrusted code, are defined in a similar way in <code>enclaveshim_ocalls.c</code> (code executed inside the enclave) and <code>ocalls.c</code> (code executed outside of the enclave).</p> <p dir="auto">If an interface function does not have an associated ecall, it prints a <code>need to implement ecall ...</code> message.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Secure processing of TLS communications</h3><a id="user-content-secure-processing-of-tls-communications" class="anchor" aria-label="Permalink: Secure processing of TLS communications" href="#secure-processing-of-tls-communications"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">TaLoS can be used to build other systems that need to process the TLS communication in a secure manner, inside an SGX enclave. The interface consists of a set of private functions, called by LibreSSL, and public functions, used by your TLS processing module to register callbacks. These callbacks are called by the "private" functions. The public interface is the following:</p> <ul dir="auto"> <li><code>void tls_processing_register_ssl_read_processing_cb(void (*cb)(const SSL*, char*, unsigned int))</code>: register the callback that will be called by <code>ssl3_read_bytes()</code> in <code>ssl/s3_pkt.c</code> when data is read from the TLS connection socket;</li> <li><code>void tls_processing_register_ssl_write_processing_cb(void (*cb)(const SSL*, char*, unsigned int))</code>: register the callback that will be called by <code>do_ssl3_write()</code> in <code>ssl/s3_pkt.c</code> when data is read from the TLS connection socket;</li> <li><code>void tls_processing_register_set_ssl_type_cb(void (*cb)(const void*, const long))</code>: register the callback that will be called by <code>BIO_int_ctrl()</code> when the command is <code>BIO_C_SET_FD</code>. This callback is used for Squid in SSL proxy mode to differentiate the connection between the client and the proxy from the connection between the proxy and the server;</li> <li><code>void tls_processing_register_new_connection_cb(void (*cb)(const SSL*))</code>: register the callback that will be called from <code>SSL_new()</code> in <code>ssl/ssl_lib.c</code> when a new TLS connection is created;</li> <li><code>void tls_processing_register_free_connection_cb(void (*cb)(const SSL*))</code>: register the callback that will be called from <code>SSL_free()</code> in <code>ssl/ssl_lib.c</code> when a TLS connection is terminated.</li> </ul> <p dir="auto">In addition, your TLS processing module must implement the <code>void tls_processing_module_init(void)</code>, which is called upon the enclave creation. In this function you can register the callbacks and initialise your code.</p> <p dir="auto">The callbacks registered for <code>tls_processing_register_ssl_read_processing_cb()</code> and <code>tls_processing_register_ssl_write_processing_cb()</code> can not only read the data buffer but also modify it in place. This can for example be used to ensure that an application calling <code>SSL_read()</code> does not observe sensitive data that goes through the TLS connection.</p> <p dir="auto">The file <code>logpoint.c</code> is a minimal example of a TLS processing module that uses this interface to log the TLS communications. To enable it, please define the <code>DO_LOGGING</code> macro in <code>logpoint.c</code>. The Makefiles define a variable <code>TLSPROCESSINGMODULE</code> which lists the files that need to be compiled for your module.</p> <p dir="auto">Note that, because TaLoS cannot load existing shared libraries inside an enclave, a recompilation of TaLoS is necessary to use a different module.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Asynchronous Enclave Transitions</h3><a id="user-content-asynchronous-enclave-transitions" class="anchor" aria-label="Permalink: Asynchronous Enclave Transitions" href="#asynchronous-enclave-transitions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">To reduce the cost of enclave transitions, it is possible to activate the asynchronous queue. Instead of threads entering and exiting the enclave, user-level tasks, implemented by the <a href="https://github.com/halayli/lthread">lthread</a> library inside the enclave, perform call executions.</p> <p dir="auto">Applications threads share two arrays with the lthread tasks to send ecalls and ocalls requests and results. These arrays are defined at lines 206 and 207 of <code>enclaveshim_ecalls.c</code>.</p> <p dir="auto">To add an ecall/ocall to the asynchronous queue, you need to:</p> <ul dir="auto"> <li> <p dir="auto">modify <code>make_asynchronous_ecall</code> in <code>enclaveshim_ecalls.c</code> to enqueue your async ecall and wait for the result or any ocall to execute;</p> </li> <li> <p dir="auto">modify your interface function in <code>enclaveshim_ecalls.c</code> to create the async ecall with the necessary arguments and read the result (see <code>SSL_read()</code> line 545 for an example);</p> </li> <li> <p dir="auto">add your new ecall (or ocall) type in <code>ecall_queue.h</code>;</p> </li> <li> <p dir="auto">create a new function in <code>enclaveshim_ocalls.h</code> to make an asynchronous ocall;</p> </li> <li> <p dir="auto">modify <code>lthread_main_handler()</code> in <code>../ssl/ssl_lib.c</code> to read your ecall from the ecall queue and execute the corresponding function.</p> </li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Shadow Data Structure Mechanism</h3><a id="user-content-shadow-data-structure-mechanism" class="anchor" aria-label="Permalink: Shadow Data Structure Mechanism" href="#shadow-data-structure-mechanism"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">TaLoS uses shadow structures to protect the security and integrity of the SSL object. It maintains a sanitised copy of the SSL structure outside the enclave, with all sensitive data removed.</p> <p dir="auto">The association between the enclave structure and the shadow structure is stored in a hashmap inside the enclave.</p> <p dir="auto">TaLoS synchronises the two SSL structures at ecalls and ocalls, as shown in the listing below:</p> <div class="highlight highlight-source-c notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="BIO* ecall_SSL_get_wbio(const SSL *s) { SSL* out_s = (SSL*)s; // retrieve the in-enclave structure from the hashmap sgx_spin_lock(&ssl_hardening_map_lock); SSL* in_s = (SSL*) hashmapGet(ssl_hardening_map, (unsigned long)out_s); sgx_spin_unlock(&ssl_hardening_map_lock); // copy fields from out structure to in structure SSL_copy_fields_to_in_struct(in_s, out_s); // execute the TLS function by passing it a pointer to the in structure BIO* ret = SSL_get_wbio((const SSL*)in_s); // copy fields form in structure to out structure SSL_copy_fields_to_out_struct(in_s, out_s); return ret; }"><pre><span class="pl-smi">BIO</span><span class="pl-c1">*</span> <span class="pl-en">ecall_SSL_get_wbio</span>(<span class="pl-k">const</span> <span class="pl-smi">SSL</span> <span class="pl-c1">*</span><span class="pl-s1">s</span>) { <span class="pl-smi">SSL</span><span class="pl-c1">*</span> <span class="pl-s1">out_s</span> <span class="pl-c1">=</span> (<span class="pl-smi">SSL</span><span class="pl-c1">*</span>)<span class="pl-s1">s</span>; <span class="pl-c">// retrieve the in-enclave structure from the hashmap</span> <span class="pl-en">sgx_spin_lock</span>(<span class="pl-c1">&</span><span class="pl-s1">ssl_hardening_map_lock</span>); <span class="pl-smi">SSL</span><span class="pl-c1">*</span> <span class="pl-s1">in_s</span> <span class="pl-c1">=</span> (<span class="pl-smi">SSL</span><span class="pl-c1">*</span>) <span class="pl-en">hashmapGet</span>(<span class="pl-s1">ssl_hardening_map</span>, (<span class="pl-smi">unsigned long</span>)<span class="pl-s1">out_s</span>); <span class="pl-en">sgx_spin_unlock</span>(<span class="pl-c1">&</span><span class="pl-s1">ssl_hardening_map_lock</span>); <span class="pl-c">// copy fields from out structure to in structure</span> <span class="pl-en">SSL_copy_fields_to_in_struct</span>(<span class="pl-s1">in_s</span>, <span class="pl-s1">out_s</span>); <span class="pl-c">// execute the TLS function by passing it a pointer to the in structure</span> <span class="pl-smi">BIO</span><span class="pl-c1">*</span> <span class="pl-s1">ret</span> <span class="pl-c1">=</span> <span class="pl-en">SSL_get_wbio</span>((<span class="pl-k">const</span> <span class="pl-smi">SSL</span><span class="pl-c1">*</span>)<span class="pl-s1">in_s</span>); <span class="pl-c">// copy fields form in structure to out structure</span> <span class="pl-en">SSL_copy_fields_to_out_struct</span>(<span class="pl-s1">in_s</span>, <span class="pl-s1">out_s</span>); <span class="pl-k">return</span> <span class="pl-s1">ret</span>; }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Secure Callbacks</h3><a id="user-content-secure-callbacks" class="anchor" aria-label="Permalink: Secure Callbacks" href="#secure-callbacks"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Several API functions permit the application to submit function pointers. As TaLoS executes inside an SGX enclave, it must trigger an ocall before calling such functions. To address this problem, we create wrapper functions. See <code>bio/bio_lib.c</code> for more details.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">References</h2><a id="user-content-references" class="anchor" aria-label="Permalink: References" href="#references"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a name="user-content-talosfootnote">1</a>: "In Greek mythology, Talos was a giant automaton made of bronze to protect Europa in Crete from pirates and invaders.", <a href="https://en.wikipedia.org/wiki/Talos" rel="nofollow">https://en.wikipedia.org/wiki/Talos</a></p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="pu5Hw+8a/J1rPr5RtQSNlnqFwjQ8OBlYH2ucUWOvJP9jrO4EpZ0KBEJiSuVn1zhh03MOtCDWsN4S9voZZO5Llw==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Efficient TLS termination inside Intel SGX enclaves for existing applications </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/libressl" title="Topic: libressl" 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href="/lsds/TaLoS/search?l=c" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#555555;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">C</span> <span>69.4%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/lsds/TaLoS/search?l=roff" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#ecdebe;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Roff</span> <span>11.1%</span> </a> </li> <li class="d-inline"> 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</svg> <span class="color-fg-default text-bold mr-1">Assembly</span> <span>6.6%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/lsds/TaLoS/search?l=shell" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#89e051;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Shell</span> <span>2.5%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/lsds/TaLoS/search?l=cmake" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#DA3434;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">CMake</span> <span>0.3%</span> </a> </li> <li class="d-inline"> <span class="d-inline-flex flex-items-center flex-nowrap text-small mr-3"> <svg style="color:#ededed;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">Other</span> <span>0.1%</span> </span> </li> </ul> </div> </div> </div> </div> </div></div> </div> </div> </turbo-frame> </main> </div> </div> <footer class="footer pt-8 pb-6 f6 color-fg-muted p-responsive" role="contentinfo" > <h2 class='sr-only'>Footer</h2> <div class="d-flex flex-justify-center flex-items-center flex-column-reverse flex-lg-row flex-wrap flex-lg-nowrap"> <div class="d-flex flex-items-center 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