X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/e3d460c9de4426da6c630c3ae3f46173a99f82d8..dd5fb164cf5b32c462296bc65e289e100f74b59a:/OSX/libsecurity_codesigning/lib/StaticCode.cpp?ds=sidebyside diff --git a/OSX/libsecurity_codesigning/lib/StaticCode.cpp b/OSX/libsecurity_codesigning/lib/StaticCode.cpp index 0b993cc7..8ec4a437 100644 --- a/OSX/libsecurity_codesigning/lib/StaticCode.cpp +++ b/OSX/libsecurity_codesigning/lib/StaticCode.cpp @@ -27,31 +27,44 @@ #include "StaticCode.h" #include "Code.h" #include "reqmaker.h" +#if TARGET_OS_OSX #include "drmaker.h" +#endif #include "reqdumper.h" #include "reqparser.h" #include "sigblob.h" #include "resources.h" #include "detachedrep.h" +#if TARGET_OS_OSX #include "csdatabase.h" +#endif #include "dirscanner.h" #include #include #include #include +#if TARGET_OS_OSX #include +#endif +#import #include #include #include +#if TARGET_OS_OSX #include +#endif #include #include +#include #include #include #include +#include #include #include #include +#include +#include namespace Security { @@ -87,14 +100,23 @@ static inline OSStatus errorForSlot(CodeDirectory::SpecialSlot slot) // Construct a SecStaticCode object given a disk representation object // SecStaticCode::SecStaticCode(DiskRep *rep) - : mRep(rep), + : mCheckfix30814861builder1(NULL), + mRep(rep), mValidated(false), mExecutableValidated(false), mResourcesValidated(false), mResourcesValidContext(NULL), - mProgressQueue("com.apple.security.validation-progress", false, DISPATCH_QUEUE_PRIORITY_DEFAULT), + mProgressQueue("com.apple.security.validation-progress", false, QOS_CLASS_UNSPECIFIED), mOuterScope(NULL), mResourceScope(NULL), - mDesignatedReq(NULL), mGotResourceBase(false), mMonitor(NULL), mLimitedAsync(NULL), mEvalDetails(NULL) + mDesignatedReq(NULL), mGotResourceBase(false), mMonitor(NULL), mLimitedAsync(NULL) +#if TARGET_OS_OSX + , mEvalDetails(NULL) +#else + , mTrustedSigningCertChain(false) +#endif + { CODESIGN_STATIC_CREATE(this, rep); +#if TARGET_OS_OSX checkForSystemSignature(); +#endif } @@ -106,6 +128,7 @@ try { ::free(const_cast(mDesignatedReq)); delete mResourcesValidContext; delete mLimitedAsync; + delete mCheckfix30814861builder1; } catch (...) { return; } @@ -158,7 +181,7 @@ CFTypeRef SecStaticCode::reportEvent(CFStringRef stage, CFDictionaryRef info) void SecStaticCode::prepareProgress(unsigned int workload) { dispatch_sync(mProgressQueue, ^{ - mCancelPending = false; // not cancelled + mCancelPending = false; // not canceled }); if (mValidationFlags & kSecCSReportProgress) { mCurrentWork = 0; // nothing done yet @@ -245,6 +268,7 @@ void SecStaticCode::detachedSignature(CFDataRef sigData) // void SecStaticCode::checkForSystemSignature() { +#if TARGET_OS_OSX if (!this->isSigned()) { SignatureDatabase db; if (db.isOpen()) @@ -256,6 +280,9 @@ void SecStaticCode::checkForSystemSignature() } catch (...) { } } +#else + MacOSError::throwMe(errSecUnimplemented); +#endif } @@ -327,11 +354,15 @@ void SecStaticCode::resetValidity() mGotResourceBase = false; mTrust = NULL; mCertChain = NULL; +#if TARGET_OS_OSX mEvalDetails = NULL; +#endif mRep->flush(); +#if TARGET_OS_OSX // we may just have updated the system database, so check again checkForSystemSignature(); +#endif } @@ -378,11 +409,23 @@ const CodeDirectory *SecStaticCode::codeDirectory(bool check /* = true */) const { if (!mDir) { // pick our favorite CodeDirectory from the choices we've got - CodeDirectoryMap candidates; - if (loadCodeDirectories(candidates)) { - CodeDirectory::HashAlgorithm type = CodeDirectory::bestHashOf(mHashAlgorithms); - mDir = candidates[type]; // and the winner is... - candidates.swap(mCodeDirectories); + try { + CodeDirectoryMap candidates; + if (loadCodeDirectories(candidates)) { + CodeDirectory::HashAlgorithm type = CodeDirectory::bestHashOf(mHashAlgorithms); + mDir = candidates[type]; // and the winner is... + candidates.swap(mCodeDirectories); + } + } catch (...) { + if (check) + throw; + // We wanted a NON-checked peek and failed to safely decode the existing CodeDirectory. + // Pretend this is unsigned, but make sure we didn't somehow cache an invalid CodeDirectory. + if (mDir) { + assert(false); + Syslog::warning("code signing internal problem: mDir set despite exception exit"); + MacOSError::throwMe(errSecCSInternalError); + } } } if (mDir) @@ -400,6 +443,8 @@ const CodeDirectory *SecStaticCode::codeDirectory(bool check /* = true */) const bool SecStaticCode::loadCodeDirectories(CodeDirectoryMap& cdMap) const { __block CodeDirectoryMap candidates; + __block CodeDirectory::HashAlgorithms hashAlgorithms; + __block CFRef baseDir; auto add = ^bool (CodeDirectory::SpecialSlot slot){ CFRef cdData = diskRep()->component(slot); if (!cdData) @@ -410,10 +455,10 @@ bool SecStaticCode::loadCodeDirectories(CodeDirectoryMap& cdMap) const cd->checkIntegrity(); auto result = candidates.insert(make_pair(cd->hashType, cdData.get())); if (!result.second) - MacOSError::throwMe(errSecCSSignatureFailed); // duplicate hashType, go to heck - mHashAlgorithms.insert(cd->hashType); + MacOSError::throwMe(errSecCSSignatureInvalid); // duplicate hashType, go to heck + hashAlgorithms.insert(cd->hashType); if (slot == cdCodeDirectorySlot) - mBaseDir = cdData; + baseDir = cdData; return true; }; if (!add(cdCodeDirectorySlot)) @@ -423,7 +468,10 @@ bool SecStaticCode::loadCodeDirectories(CodeDirectoryMap& cdMap) const break; if (candidates.empty()) MacOSError::throwMe(errSecCSSignatureFailed); // no viable CodeDirectory in sight + // commit to cached values cdMap.swap(candidates); + mHashAlgorithms.swap(hashAlgorithms); + mBaseDir = baseDir; return true; } @@ -504,12 +552,17 @@ void SecStaticCode::validateDirectory() mValidationResult = err.osStatus(); throw; } catch (...) { - secdebug("staticCode", "%p validation threw non-common exception", this); + secinfo("staticCode", "%p validation threw non-common exception", this); mValidated = true; + Syslog::notice("code signing internal problem: unknown exception thrown by validation"); mValidationResult = errSecCSInternalError; throw; } assert(validated()); + // XXX: Embedded doesn't have CSSMERR_TP_CERT_EXPIRED so we can't throw it + // XXX: This should be implemented for embedded once we implement + // XXX: verifySignature and see how we're going to handle expired certs +#if TARGET_OS_OSX if (mValidationResult == errSecSuccess) { if (mValidationExpired) if ((mValidationFlags & kSecCSConsiderExpiration) @@ -517,6 +570,7 @@ void SecStaticCode::validateDirectory() MacOSError::throwMe(CSSMERR_TP_CERT_EXPIRED); } else MacOSError::throwMe(mValidationResult); +#endif } @@ -555,7 +609,7 @@ void SecStaticCode::validateTopDirectory() if (component(slot)) foundVector.push_back(slot); int alternateCount = int(mCodeDirectories.size() - 1); // one will go into cdCodeDirectorySlot - for (unsigned n = 0; n < alternateCount; n++) + for (int n = 0; n < alternateCount; n++) foundVector.push_back(cdAlternateCodeDirectorySlots + n); foundVector.push_back(cdSignatureSlot); // mandatory (may be empty) @@ -603,7 +657,7 @@ bool SecStaticCode::verifySignature() } DTRACK(CODESIGN_EVAL_STATIC_SIGNATURE, this, (char*)this->mainExecutablePath().c_str()); - +#if TARGET_OS_OSX // decode CMS and extract SecTrust for verification CFRef cms; MacOSError::check(CMSDecoderCreate(&cms.aref())); // create decoder @@ -613,11 +667,12 @@ bool SecStaticCode::verifySignature() MacOSError::check(CMSDecoderSetDetachedContent(cms, mBaseDir)); MacOSError::check(CMSDecoderFinalizeMessage(cms)); MacOSError::check(CMSDecoderSetSearchKeychain(cms, cfEmptyArray())); - CFRef vf_policies = verificationPolicies(); - CFRef ts_policies = SecPolicyCreateAppleTimeStampingAndRevocationPolicies(vf_policies); - CMSSignerStatus status; - MacOSError::check(CMSDecoderCopySignerStatus(cms, 0, vf_policies, - false, &status, &mTrust.aref(), NULL)); + CFRef vf_policies(createVerificationPolicies()); + CFRef ts_policies(createTimeStampingAndRevocationPolicies()); + + CMSSignerStatus status; + MacOSError::check(CMSDecoderCopySignerStatus(cms, 0, vf_policies, + false, &status, &mTrust.aref(), NULL)); if (status != kCMSSignerValid) { const char *reason; @@ -633,7 +688,7 @@ bool SecStaticCode::verifySignature() reason, (int)status); MacOSError::throwMe(errSecCSSignatureFailed); } - + // retrieve auxiliary data bag and verify against current state CFRef hashBag; switch (OSStatus rc = CMSDecoderCopySignerAppleCodesigningHashAgility(cms, 0, &hashBag.aref())) { @@ -678,13 +733,13 @@ bool SecStaticCode::verifySignature() if (mValidationFlags & kSecCSNoNetworkAccess) { MacOSError::check(SecTrustSetNetworkFetchAllowed(mTrust,false)); // no network? } - MacOSError::check(SecTrustSetKeychains(mTrust, cfEmptyArray())); // no keychains - + MacOSError::check(SecTrustSetKeychainsAllowed(mTrust, false)); + CSSM_APPLE_TP_ACTION_DATA actionData = { CSSM_APPLE_TP_ACTION_VERSION, // version of data structure 0 // action flags }; - + if (!(mValidationFlags & kSecCSCheckTrustedAnchors)) { /* no need to evaluate anchor trust when building cert chain */ MacOSError::check(SecTrustSetAnchorCertificates(mTrust, cfEmptyArray())); // no anchors @@ -713,12 +768,13 @@ bool SecStaticCode::verifySignature() CFRef teamIDFromCD = CFStringCreateWithCString(NULL, teamID(), kCFStringEncodingUTF8); if (!teamIDFromCD) { Security::Syslog::error("Could not get team identifier (%s)", teamID()); - MacOSError::throwMe(errSecCSInternalError); + MacOSError::throwMe(errSecCSInvalidTeamIdentifier); } if (CFStringCompare(teamIDFromCert, teamIDFromCD, 0) != kCFCompareEqualTo) { - Security::Syslog::error("Team identifier in the signing certificate (%s) does not match the team identifier (%s) in the code directory", cfString(teamIDFromCert).c_str(), teamID()); - MacOSError::throwMe(errSecCSSignatureInvalid); + Security::Syslog::error("Team identifier in the signing certificate (%s) does not match the team identifier (%s) in the code directory", + cfString(teamIDFromCert).c_str(), teamID()); + MacOSError::throwMe(errSecCSBadTeamIdentifier); } } } @@ -776,59 +832,131 @@ bool SecStaticCode::verifySignature() return actionData.ActionFlags & CSSM_TP_ACTION_ALLOW_EXPIRED; } -} +#else + // Do some pre-verification initialization + CFDataRef sig = this->signature(); + this->codeDirectory(); // load CodeDirectory (sets mDir) + mSigningTime = 0; // "not present" marker (nobody could code sign on Jan 1, 2001 :-) + + CFRef attrs; + CFRef vf_policies(createVerificationPolicies()); + + // Verify the CMS signature against mBaseDir (SHA1) + MacOSError::check(SecCMSVerifyCopyDataAndAttributes(sig, mBaseDir, vf_policies, &mTrust.aref(), NULL, &attrs.aref())); + + // Copy the signing time + mSigningTime = SecTrustGetVerifyTime(mTrust); + + // Validate the cert chain + SecTrustResultType trustResult; + MacOSError::check(SecTrustEvaluate(mTrust, &trustResult)); + + // retrieve auxiliary data bag and verify against current state + CFRef hashBag; + hashBag = CFDataRef(CFDictionaryGetValue(attrs, kSecCMSHashAgility)); + if (hashBag) { + CFRef hashDict = makeCFDictionaryFrom(hashBag); + CFArrayRef cdList = CFArrayRef(CFDictionaryGetValue(hashDict, CFSTR("cdhashes"))); + CFArrayRef myCdList = this->cdHashes(); + if (cdList == NULL || !CFEqual(cdList, myCdList)) + MacOSError::throwMe(errSecCSSignatureFailed); + } + /* + * Populate mCertChain with the certs. If we failed validation, the + * signer's cert will be checked installed provisioning profiles as an + * alternative to verification against the policy for store-signed binaries + */ + SecCertificateRef leafCert = SecTrustGetCertificateAtIndex(mTrust, 0); + if (leafCert != NULL) { + CFIndex count = SecTrustGetCertificateCount(mTrust); + + CFMutableArrayRef certs = CFArrayCreateMutable(kCFAllocatorDefault, count, + &kCFTypeArrayCallBacks); + + CFArrayAppendValue(certs, leafCert); + for (CFIndex i = 1; i < count; ++i) { + CFArrayAppendValue(certs, SecTrustGetCertificateAtIndex(mTrust, i)); + } + + mCertChain.take((CFArrayRef)certs); + } + + // Did we implicitly trust the signer? + mTrustedSigningCertChain = (trustResult == kSecTrustResultUnspecified); + + return false; // XXX: Not checking for expired certs +#endif +} +#if TARGET_OS_OSX // // Return the TP policy used for signature verification. // This may be a simple SecPolicyRef or a CFArray of policies. // The caller owns the return value. // -static SecPolicyRef makeCRLPolicy() +static SecPolicyRef makeRevocationPolicy(CFOptionFlags flags) { - CFRef policy; - MacOSError::check(SecPolicyCopy(CSSM_CERT_X_509v3, &CSSMOID_APPLE_TP_REVOCATION_CRL, &policy.aref())); - CSSM_APPLE_TP_CRL_OPTIONS options; - memset(&options, 0, sizeof(options)); - options.Version = CSSM_APPLE_TP_CRL_OPTS_VERSION; - options.CrlFlags = CSSM_TP_ACTION_FETCH_CRL_FROM_NET | CSSM_TP_ACTION_CRL_SUFFICIENT; - CSSM_DATA optData = { sizeof(options), (uint8 *)&options }; - MacOSError::check(SecPolicySetValue(policy, &optData)); + CFRef policy(SecPolicyCreateRevocation(flags)); return policy.yield(); } +#endif -static SecPolicyRef makeOCSPPolicy() -{ - CFRef policy; - MacOSError::check(SecPolicyCopy(CSSM_CERT_X_509v3, &CSSMOID_APPLE_TP_REVOCATION_OCSP, &policy.aref())); - CSSM_APPLE_TP_OCSP_OPTIONS options; - memset(&options, 0, sizeof(options)); - options.Version = CSSM_APPLE_TP_OCSP_OPTS_VERSION; - options.Flags = CSSM_TP_ACTION_OCSP_SUFFICIENT; - CSSM_DATA optData = { sizeof(options), (uint8 *)&options }; - MacOSError::check(SecPolicySetValue(policy, &optData)); - return policy.yield(); -} - -CFArrayRef SecStaticCode::verificationPolicies() +CFArrayRef SecStaticCode::createVerificationPolicies() { + if (mValidationFlags & kSecCSUseSoftwareSigningCert) { + CFRef ssRef = SecPolicyCreateAppleSoftwareSigning(); + return makeCFArray(1, ssRef.get()); + } +#if TARGET_OS_OSX CFRef core; MacOSError::check(SecPolicyCopy(CSSM_CERT_X_509v3, - &CSSMOID_APPLE_TP_CODE_SIGNING, &core.aref())); - if (mValidationFlags & kSecCSNoNetworkAccess) { - // Skips all revocation since they require network connectivity - // therefore annihilates kSecCSEnforceRevocationChecks if present - CFRef no_revoc = SecPolicyCreateRevocation(kSecRevocationNetworkAccessDisabled); - return makeCFArray(2, core.get(), no_revoc.get()); - } + &CSSMOID_APPLE_TP_CODE_SIGNING, &core.aref())); + if (mValidationFlags & kSecCSNoNetworkAccess) { + // Skips all revocation since they require network connectivity + // therefore annihilates kSecCSEnforceRevocationChecks if present + CFRef no_revoc = makeRevocationPolicy(kSecRevocationNetworkAccessDisabled); + return makeCFArray(2, core.get(), no_revoc.get()); + } else if (mValidationFlags & kSecCSEnforceRevocationChecks) { - // Add CRL and OCSPPolicies - CFRef crl = makeCRLPolicy(); - CFRef ocsp = makeOCSPPolicy(); - return makeCFArray(3, core.get(), crl.get(), ocsp.get()); + // Add CRL and OCSP policies + CFRef revoc = makeRevocationPolicy(kSecRevocationUseAnyAvailableMethod); + return makeCFArray(2, core.get(), revoc.get()); } else { return makeCFArray(1, core.get()); } +#elif TARGET_OS_TV + CFRef tvOSRef = SecPolicyCreateAppleTVOSApplicationSigning(); + return makeCFArray(1, tvOSRef.get()); +#else + CFRef iOSRef = SecPolicyCreateiPhoneApplicationSigning(); + return makeCFArray(1, iOSRef.get()); +#endif + +} + +CFArrayRef SecStaticCode::createTimeStampingAndRevocationPolicies() +{ + CFRef tsPolicy = SecPolicyCreateAppleTimeStamping(); +#if TARGET_OS_OSX + if (mValidationFlags & kSecCSNoNetworkAccess) { + // Skips all revocation since they require network connectivity + // therefore annihilates kSecCSEnforceRevocationChecks if present + CFRef no_revoc = makeRevocationPolicy(kSecRevocationNetworkAccessDisabled); + return makeCFArray(2, tsPolicy.get(), no_revoc.get()); + } + else if (mValidationFlags & kSecCSEnforceRevocationChecks) { + // Add CRL and OCSP policies + CFRef revoc = makeRevocationPolicy(kSecRevocationUseAnyAvailableMethod); + return makeCFArray(2, tsPolicy.get(), revoc.get()); + } + else { + return makeCFArray(1, tsPolicy.get()); + } +#else + return makeCFArray(1, tsPolicy.get()); +#endif + } @@ -898,9 +1026,10 @@ void SecStaticCode::validateExecutable() mExecutableValidResult = err.osStatus(); throw; } catch (...) { - secdebug("staticCode", "%p executable validation threw non-common exception", this); + secinfo("staticCode", "%p executable validation threw non-common exception", this); mExecutableValidated = true; mExecutableValidResult = errSecCSInternalError; + Syslog::notice("code signing internal problem: unknown exception thrown by validation"); throw; } } @@ -942,18 +1071,11 @@ void SecStaticCode::validateResources(SecCSFlags flags) } try { - // sanity first - CFDictionaryRef sealedResources = resourceDictionary(); - if (this->resourceBase()) // disk has resources - if (sealedResources) - /* go to work below */; - else - MacOSError::throwMe(errSecCSResourcesNotFound); - else // disk has no resources - if (sealedResources) - MacOSError::throwMe(errSecCSResourcesNotFound); - else - return; // no resources, not sealed - fine (no work) + CFDictionaryRef rules; + CFDictionaryRef files; + uint32_t version; + if (!loadResources(rules, files, version)) + return; // validly no resources; nothing to do (ok) // found resources, and they are sealed DTRACK(CODESIGN_EVAL_STATIC_RESOURCES, this, @@ -962,22 +1084,6 @@ void SecStaticCode::validateResources(SecCSFlags flags) // scan through the resources on disk, checking each against the resourceDirectory mResourcesValidContext = new CollectingContext(*this); // collect all failures in here - // use V2 resource seal if available, otherwise fall back to V1 - CFDictionaryRef rules; - CFDictionaryRef files; - uint32_t version; - if (CFDictionaryGetValue(sealedResources, CFSTR("files2"))) { // have V2 signature - rules = cfget(sealedResources, "rules2"); - files = cfget(sealedResources, "files2"); - version = 2; - } else { // only V1 available - rules = cfget(sealedResources, "rules"); - files = cfget(sealedResources, "files"); - version = 1; - } - if (!rules || !files) - MacOSError::throwMe(errSecCSResourcesInvalid); - // check for weak resource rules bool strict = flags & kSecCSStrictValidate; if (strict) { @@ -1014,7 +1120,7 @@ void SecStaticCode::validateResources(SecCSFlags flags) unsigned leftovers = unsigned(CFDictionaryGetCount(resourceMap)); if (leftovers > 0) { - secdebug("staticCode", "%d sealed resource(s) not found in code", int(leftovers)); + secinfo("staticCode", "%d sealed resource(s) not found in code", int(leftovers)); CFDictionaryApplyFunction(resourceMap, SecStaticCode::checkOptionalResource, mResourcesValidContext); } @@ -1029,10 +1135,11 @@ void SecStaticCode::validateResources(SecCSFlags flags) mResourcesValidResult = err.osStatus(); throw; } catch (...) { - secdebug("staticCode", "%p executable validation threw non-common exception", this); + secinfo("staticCode", "%p executable validation threw non-common exception", this); mResourcesValidated = true; mResourcesDeep = flags & kSecCSCheckNestedCode; mResourcesValidResult = errSecCSInternalError; + Syslog::notice("code signing internal problem: unknown exception thrown by validation"); throw; } } @@ -1044,6 +1151,38 @@ void SecStaticCode::validateResources(SecCSFlags flags) } +bool SecStaticCode::loadResources(CFDictionaryRef& rules, CFDictionaryRef& files, uint32_t& version) +{ + // sanity first + CFDictionaryRef sealedResources = resourceDictionary(); + if (this->resourceBase()) { // disk has resources + if (sealedResources) + /* go to work below */; + else + MacOSError::throwMe(errSecCSResourcesNotFound); + } else { // disk has no resources + if (sealedResources) + MacOSError::throwMe(errSecCSResourcesNotFound); + else + return false; // no resources, not sealed - fine (no work) + } + + // use V2 resource seal if available, otherwise fall back to V1 + if (CFDictionaryGetValue(sealedResources, CFSTR("files2"))) { // have V2 signature + rules = cfget(sealedResources, "rules2"); + files = cfget(sealedResources, "files2"); + version = 2; + } else { // only V1 available + rules = cfget(sealedResources, "rules"); + files = cfget(sealedResources, "files"); + version = 1; + } + if (!rules || !files) + MacOSError::throwMe(errSecCSResourcesInvalid); + return true; +} + + void SecStaticCode::checkOptionalResource(CFTypeRef key, CFTypeRef value, void *context) { ValidationContext *ctx = static_cast(context); @@ -1075,8 +1214,10 @@ bool SecStaticCode::hasWeakResourceRules(CFDictionaryRef rulesDict, uint32_t ver { // compute allowed omissions CFRef defaultOmissions = this->diskRep()->allowedResourceOmissions(); - if (!defaultOmissions) + if (!defaultOmissions) { + Syslog::notice("code signing internal problem: diskRep returned no allowedResourceOmissions"); MacOSError::throwMe(errSecCSInternalError); + } CFRef allowed = CFArrayCreateMutableCopy(NULL, 0, defaultOmissions); if (allowedOmissions) CFArrayAppendArray(allowed, allowedOmissions, CFRangeMake(0, CFArrayGetCount(allowedOmissions))); @@ -1109,7 +1250,7 @@ CFDictionaryRef SecStaticCode::infoDictionary() { if (!mInfoDict) { mInfoDict.take(getDictionary(cdInfoSlot, errSecCSInfoPlistFailed)); - secdebug("staticCode", "%p loaded InfoDict %p", this, mInfoDict.get()); + secinfo("staticCode", "%p loaded InfoDict %p", this, mInfoDict.get()); } return mInfoDict; } @@ -1123,7 +1264,7 @@ CFDictionaryRef SecStaticCode::entitlements() const EntitlementBlob *blob = reinterpret_cast(CFDataGetBytePtr(entitlementData)); if (blob->validateBlob()) { mEntitlements.take(blob->entitlements()); - secdebug("staticCode", "%p loaded Entitlements %p", this, mEntitlements.get()); + secinfo("staticCode", "%p loaded Entitlements %p", this, mEntitlements.get()); } // we do not consider a different blob type to be an error. We think it's a new format we don't understand } @@ -1137,13 +1278,31 @@ CFDictionaryRef SecStaticCode::resourceDictionary(bool check /* = true */) return mResourceDict; if (CFRef dict = getDictionary(cdResourceDirSlot, check)) if (cfscan(dict, "{rules=%Dn,files=%Dn}")) { - secdebug("staticCode", "%p loaded ResourceDict %p", + secinfo("staticCode", "%p loaded ResourceDict %p", this, mResourceDict.get()); return mResourceDict = dict; } // bad format return NULL; } + + +CFDataRef SecStaticCode::copyComponent(CodeDirectory::SpecialSlot slot, CFDataRef hash) +{ + const CodeDirectory* cd = this->codeDirectory(); + if (CFCopyRef component = this->component(slot)) { + if (hash) { + const void *slotHash = (*cd)[slot]; + if (cd->hashSize != CFDataGetLength(hash) || 0 != memcmp(slotHash, CFDataGetBytePtr(hash), cd->hashSize)) { + Syslog::notice("copyComponent hash mismatch slot %d length %d", slot, int(CFDataGetLength(hash))); + return NULL; // mismatch + } + } + return component.yield(); + } + return NULL; +} + // @@ -1181,57 +1340,84 @@ CFDictionaryRef SecStaticCode::getDictionary(CodeDirectory::SpecialSlot slot, bo return NULL; } - -// -// Load, validate, and return a sealed resource. -// The resource data (loaded in to memory as a blob) is returned and becomes -// the responsibility of the caller; it is NOT cached by SecStaticCode. // -// A resource that is not sealed will not be returned, and an error will be thrown. -// A missing resource will cause an error unless it's marked optional in the Directory. -// Under no circumstances will a corrupt resource be returned. -// NULL will only be returned for a resource that is neither sealed nor present -// (or that is sealed, absent, and marked optional). -// If the ResourceDictionary itself is not sealed, this function will always fail. // -// There is currently no interface for partial retrieval of the resource data. -// (Since the ResourceDirectory does not currently support segmentation, all the -// data would have to be read anyway, but it could be read into a reusable buffer.) // -CFDataRef SecStaticCode::resource(string path, ValidationContext &ctx) +CFDictionaryRef SecStaticCode::diskRepInformation() { - if (CFDictionaryRef rdict = resourceDictionary()) { - if (CFTypeRef file = cfget(rdict, "files.%s", path.c_str())) { - ResourceSeal seal(file); - if (!resourceBase()) // no resources in DiskRep - MacOSError::throwMe(errSecCSResourcesNotFound); - if (seal.nested()) - MacOSError::throwMe(errSecCSResourcesNotSealed); // (it's nested code) - CFRef fullpath = makeCFURL(path, false, resourceBase()); - if (CFRef data = cfLoadFile(fullpath)) { - MakeHash hasher(this->codeDirectory()); - hasher->update(CFDataGetBytePtr(data), CFDataGetLength(data)); - if (hasher->verify(seal.hash(hashAlgorithm()))) - return data.yield(); // good - else - ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAltered, fullpath); // altered - } else { - if (!seal.optional()) - ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceMissing, fullpath); // was sealed but is now missing - else - return NULL; // validly missing - } - } else - ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAdded, CFTempURL(path, false, resourceBase())); - return NULL; - } else - MacOSError::throwMe(errSecCSResourcesNotSealed); + return mRep->diskRepInformation(); } -CFDataRef SecStaticCode::resource(string path) -{ - ValidationContext ctx(*this); - return resource(path, ctx); +bool SecStaticCode::checkfix30814861(string path, bool addition) { + // v2 resource rules don't match v1 resource rules + + //// Condition 1: Is the app an iOS app that was built with an SDK lower than 9.0? + + // We started signing correctly in 2014, 9.0 was first seeded mid-2016. + + CFRef inf = diskRepInformation(); + try { + CFDictionary info(diskRepInformation(), errSecCSNotSupported); + uint32_t platformCmd = + cfNumber(info.get(kSecCodeInfoDiskRepOSPlatform, errSecCSNotSupported), 0); + uint32_t sdkVersion = + cfNumber(info.get(kSecCodeInfoDiskRepOSSDKVersion, errSecCSNotSupported), 0); + + if (platformCmd != LC_VERSION_MIN_IPHONEOS || sdkVersion >= 0x00090000) { + return false; + } + } catch (const MacOSError &error) { + return false; + } + + //// Condition 2: Is it a .sinf/.supf/.supp file at the right location? + + static regex_t pathre_sinf; + static regex_t pathre_supp_supf; + static dispatch_once_t once; + + dispatch_once(&once, ^{ + os_assert_zero(regcomp(&pathre_sinf, + "^(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|())SC_Info/[^/]+\\.sinf$", + REG_EXTENDED | REG_NOSUB)); + os_assert_zero(regcomp(&pathre_supp_supf, + "^(Frameworks/[^/]+\\.framework/|PlugIns/[^/]+\\.appex/|())SC_Info/[^/]+\\.(supf|supp)$", + REG_EXTENDED | REG_NOSUB)); + }); + + // .sinf is added, .supf/.supp are modified. + const regex_t &pathre = addition ? pathre_sinf : pathre_supp_supf; + + const int result = regexec(&pathre, path.c_str(), 0, NULL, 0); + + if (result == REG_NOMATCH) { + return false; + } else if (result != 0) { + // Huh? + secerror("unexpected regexec result %d for path '%s'", result, path.c_str()); + return false; + } + + //// Condition 3: Do the v1 rules actually exclude the file? + + dispatch_once(&mCheckfix30814861builder1_once, ^{ + // Create the v1 resource builder lazily. + CFDictionaryRef rules1 = cfget(resourceDictionary(), "rules"); + const string base = cfString(resourceBase()); + + mCheckfix30814861builder1 = new ResourceBuilder(base, base, rules1, false, mTolerateErrors); + }); + + ResourceBuilder::Rule const * const matchingRule = mCheckfix30814861builder1->findRule(path); + + if (matchingRule == NULL || !(matchingRule->flags & ResourceBuilder::omitted)) { + return false; + } + + //// All matched, this file is a check-fixed sinf/supf/supp. + + return true; + } void SecStaticCode::validateResource(CFDictionaryRef files, string path, bool isSymlink, ValidationContext &ctx, SecCSFlags flags, uint32_t version) @@ -1239,6 +1425,11 @@ void SecStaticCode::validateResource(CFDictionaryRef files, string path, bool is if (!resourceBase()) // no resources in DiskRep MacOSError::throwMe(errSecCSResourcesNotFound); CFRef fullpath = makeCFURL(path, false, resourceBase()); + if (version > 1 && ((flags & (kSecCSStrictValidate|kSecCSRestrictSidebandData)) == (kSecCSStrictValidate|kSecCSRestrictSidebandData))) { + AutoFileDesc fd(cfString(fullpath)); + if (fd.hasExtendedAttribute(XATTR_RESOURCEFORK_NAME) || fd.hasExtendedAttribute(XATTR_FINDERINFO_NAME)) + ctx.reportProblem(errSecCSInvalidAssociatedFileData, kSecCFErrorResourceSideband, fullpath); + } if (CFTypeRef file = CFDictionaryGetValue(files, CFTempString(path))) { ResourceSeal seal(file); const ResourceSeal& rseal = seal; @@ -1263,8 +1454,13 @@ void SecStaticCode::validateResource(CFDictionaryRef files, string path, bool is if (!hasher->verify(rseal.hash(type))) good = false; }); - if (!good) - ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAltered, fullpath); // altered + if (!good) { + if (version == 2 && checkfix30814861(path, false)) { + secinfo("validateResource", "%s check-fixed (altered).", path.c_str()); + } else { + ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAltered, fullpath); // altered + } + } } else { if (!seal.optional()) ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceMissing, fullpath); // was sealed but is now missing @@ -1280,9 +1476,31 @@ void SecStaticCode::validateResource(CFDictionaryRef files, string path, bool is if (::readlink(cfString(fullpath).c_str(), target, sizeof(target)) > 0) return; } - ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAdded, CFTempURL(path, false, resourceBase())); + if (version == 2 && checkfix30814861(path, true)) { + secinfo("validateResource", "%s check-fixed (added).", path.c_str()); + } else { + ctx.reportProblem(errSecCSBadResource, kSecCFErrorResourceAdded, CFTempURL(path, false, resourceBase())); + } } +void SecStaticCode::validatePlainMemoryResource(string path, CFDataRef fileData, SecCSFlags flags) +{ + CFDictionaryRef rules; + CFDictionaryRef files; + uint32_t version; + if (!loadResources(rules, files, version)) + MacOSError::throwMe(errSecCSResourcesNotFound); // no resources sealed; this can't be right + if (CFTypeRef file = CFDictionaryGetValue(files, CFTempString(path))) { + ResourceSeal seal(file); + const Byte *sealHash = seal.hash(hashAlgorithm()); + if (sealHash) { + if (codeDirectory()->verifyMemoryContent(fileData, sealHash)) + return; // success + } + } + MacOSError::throwMe(errSecCSBadResource); +} + void SecStaticCode::validateSymlinkResource(std::string fullpath, std::string seal, ValidationContext &ctx, SecCSFlags flags) { static const char* const allowedDestinations[] = { @@ -1344,14 +1562,14 @@ void SecStaticCode::validateNestedCode(CFURLRef path, const ResourceSeal &seal, // recursively verify this nested code try { if (!(flags & kSecCSCheckNestedCode)) - flags |= kSecCSBasicValidateOnly; + flags |= kSecCSBasicValidateOnly | kSecCSQuickCheck; SecPointer code = new SecStaticCode(DiskRep::bestGuess(cfString(path))); code->initializeFromParent(*this); - code->staticValidate(flags & ~kSecCSRestrictToAppLike, SecRequirement::required(req)); + code->staticValidate(flags & (~kSecCSRestrictToAppLike), SecRequirement::required(req)); if (isFramework && (flags & kSecCSStrictValidate)) try { - validateOtherVersions(path, flags, req, code); + validateOtherVersions(path, flags & (~kSecCSRestrictToAppLike), req, code); } catch (const CSError &err) { MacOSError::throwMe(errSecCSBadFrameworkVersion); } catch (const MacOSError &err) { @@ -1397,10 +1615,7 @@ void SecStaticCode::validateOtherVersions(CFURLRef path, SecCSFlags flags, SecRe while ((entry = scanner.getNext()) != NULL) { std::ostringstream fullPath; - if (entry->d_type != DT_DIR || - strcmp(entry->d_name, ".") == 0 || - strcmp(entry->d_name, "..") == 0 || - strcmp(entry->d_name, "Current") == 0) + if (entry->d_type != DT_DIR || strcmp(entry->d_name, "Current") == 0) continue; fullPath << versionsPath.str() << entry->d_name; @@ -1504,6 +1719,7 @@ const Requirement *SecStaticCode::defaultDesignatedRequirement() } return maker.make(); } else { +#if TARGET_OS_OSX // full signature: Gin up full context and let DRMaker do its thing validateDirectory(); // need the cert chain Requirement::Context context(this->certificates(), @@ -1513,6 +1729,9 @@ const Requirement *SecStaticCode::defaultDesignatedRequirement() this->codeDirectory() ); return DRMaker(context).make(); +#else + MacOSError::throwMe(errSecCSUnimplemented); +#endif } } @@ -1532,9 +1751,6 @@ void SecStaticCode::validateRequirements(SecRequirementType type, SecStaticCode /* accept it */; } -/* Public Key Hash for root:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority */ -static const UInt8 retryRootBytes[] = {0x00,0xd8,0x5a,0x4c,0x25,0xc1,0x22,0xe5,0x8b,0x31,0xef,0x6d,0xba,0xf3,0xcc,0x5f,0x29,0xf1,0x0d,0x61}; - // // Validate this StaticCode against an external Requirement // @@ -1544,34 +1760,6 @@ bool SecStaticCode::satisfiesRequirement(const Requirement *req, OSStatus failur assert(req); validateDirectory(); result = req->validates(Requirement::Context(mCertChain, infoDictionary(), entitlements(), codeDirectory()->identifier(), codeDirectory()), failure); - if (result == false) { - /* Fix for rdar://problem/21437632: Work around untrusted root in validation chain */ - CFArrayRef certs = certificates(); - if (!certs || ((int)CFArrayGetCount(certs) < 1)) { - return false; - } - SecCertificateRef root = cert((int)CFArrayGetCount(certs) - 1); - if (!root) { - return false; - } - CFDataRef rootHash = SecCertificateCopyPublicKeySHA1Digest(root); - if (!rootHash) { - return false; - } - - if ((CFDataGetLength(rootHash) == sizeof(retryRootBytes)) && - !memcmp(CFDataGetBytePtr(rootHash), retryRootBytes, sizeof(retryRootBytes))) { - // retry with a rebuilt certificate chain, this time evaluating anchor trust - Security::Syslog::debug("Requirements validation failed: retrying"); - mResourcesValidated = mValidated = false; - setValidationFlags(mValidationFlags | kSecCSCheckTrustedAnchors); - - validateDirectory(); - result = req->validates(Requirement::Context(mCertChain, infoDictionary(), entitlements(), codeDirectory()->identifier(), codeDirectory()), failure); - } - CFRelease(rootHash); - } - return result; } @@ -1680,7 +1868,10 @@ CFDictionaryRef SecStaticCode::signingInformation(SecCSFlags flags) // kSecCSRequirementInformation adds information on requirements // if (flags & kSecCSRequirementInformation) - try { + +//DR not currently supported on iOS +#if TARGET_OS_OSX + try { if (const Requirements *reqs = this->internalRequirements()) { CFDictionaryAddValue(dict, kSecCodeInfoRequirements, CFTempString(Dumper::dump(reqs))); @@ -1697,14 +1888,15 @@ CFDictionaryRef SecStaticCode::signingInformation(SecCSFlags flags) CFDictionaryAddValue(dict, kSecCodeInfoImplicitDesignatedRequirement, dreqRef); } } catch (...) { } +#endif - try { - if (CFDataRef ent = this->component(cdEntitlementSlot)) { - CFDictionaryAddValue(dict, kSecCodeInfoEntitlements, ent); - if (CFDictionaryRef entdict = this->entitlements()) - CFDictionaryAddValue(dict, kSecCodeInfoEntitlementsDict, entdict); - } - } catch (...) { } + try { + if (CFDataRef ent = this->component(cdEntitlementSlot)) { + CFDictionaryAddValue(dict, kSecCodeInfoEntitlements, ent); + if (CFDictionaryRef entdict = this->entitlements()) + CFDictionaryAddValue(dict, kSecCodeInfoEntitlementsDict, entdict); + } + } catch (...) { } // // kSecCSInternalInformation adds internal information meant to be for Apple internal @@ -1712,14 +1904,19 @@ CFDictionaryRef SecStaticCode::signingInformation(SecCSFlags flags) // to reliably transmit through the API wall so that code outside the Security.framework // can use it without having to play nasty tricks to get it. // - if (flags & kSecCSInternalInformation) + if (flags & kSecCSInternalInformation) { try { if (mDir) CFDictionaryAddValue(dict, kSecCodeInfoCodeDirectory, mDir); CFDictionaryAddValue(dict, kSecCodeInfoCodeOffset, CFTempNumber(mRep->signingBase())); - if (CFRef rdict = getDictionary(cdResourceDirSlot, false)) // suppress validation - CFDictionaryAddValue(dict, kSecCodeInfoResourceDirectory, rdict); + if (!(flags & kSecCSSkipResourceDirectory)) { + if (CFRef rdict = getDictionary(cdResourceDirSlot, false)) // suppress validation + CFDictionaryAddValue(dict, kSecCodeInfoResourceDirectory, rdict); + } + if (CFRef ddict = diskRepInformation()) + CFDictionaryAddValue(dict, kSecCodeInfoDiskRepInfo, ddict); } catch (...) { } + } // @@ -1727,7 +1924,7 @@ CFDictionaryRef SecStaticCode::signingInformation(SecCSFlags flags) // of the signed code. This is (only) useful for packaging or patching-oriented // applications. // - if (flags & kSecCSContentInformation) + if (flags & kSecCSContentInformation && !(flags & kSecCSSkipResourceDirectory)) if (CFRef files = mRep->modifiedFiles()) CFDictionaryAddValue(dict, kSecCodeInfoChangedFiles, files); @@ -1794,7 +1991,8 @@ void SecStaticCode::staticValidate(SecCSFlags flags, const SecRequirement *req) if (flags & kSecCSReportProgress) prepareProgress(estimateResourceWorkload() + 2); // +1 head, +1 tail - // core components: once per architecture (if any) + + // core components: once per architecture (if any) this->staticValidateCore(flags, req); if (flags & kSecCSCheckAllArchitectures) handleOtherArchitectures(^(SecStaticCode* subcode) { @@ -1873,21 +2071,24 @@ void SecStaticCode::handleOtherArchitectures(void (^handle)(SecStaticCode* other fat->architectures(architectures); if (architectures.size() > 1) { DiskRep::Context ctx; - size_t activeOffset = fat->archOffset(); + off_t activeOffset = fat->archOffset(); for (Universal::Architectures::const_iterator arch = architectures.begin(); arch != architectures.end(); ++arch) { - ctx.offset = fat->archOffset(*arch); - if (ctx.offset > SIZE_MAX) - MacOSError::throwMe(errSecCSInternalError); - ctx.size = fat->lengthOfSlice((size_t)ctx.offset); - if (ctx.offset != activeOffset) { // inactive architecture; check it - SecPointer subcode = new SecStaticCode(DiskRep::bestGuess(this->mainExecutablePath(), &ctx)); - subcode->detachedSignature(this->mDetachedSig); // carry over explicit (but not implicit) detached signature - if (this->teamID() == NULL || subcode->teamID() == NULL) { - if (this->teamID() != subcode->teamID()) + try { + ctx.offset = int_cast(fat->archOffset(*arch)); + ctx.size = fat->lengthOfSlice(int_cast(ctx.offset)); + if (ctx.offset != activeOffset) { // inactive architecture; check it + SecPointer subcode = new SecStaticCode(DiskRep::bestGuess(this->mainExecutablePath(), &ctx)); + subcode->detachedSignature(this->mDetachedSig); // carry over explicit (but not implicit) detached signature + if (this->teamID() == NULL || subcode->teamID() == NULL) { + if (this->teamID() != subcode->teamID()) + MacOSError::throwMe(errSecCSSignatureInvalid); + } else if (strcmp(this->teamID(), subcode->teamID()) != 0) MacOSError::throwMe(errSecCSSignatureInvalid); - } else if (strcmp(this->teamID(), subcode->teamID()) != 0) - MacOSError::throwMe(errSecCSSignatureInvalid); - handle(subcode); + handle(subcode); + } + } catch(std::out_of_range e) { + // some of our int_casts fell over. + MacOSError::throwMe(errSecCSBadObjectFormat); } } }