+ // retrieve auxiliary v1 data bag and verify against current state
+ CFRef<CFDataRef> hashAgilityV1;
+ switch (OSStatus rc = CMSDecoderCopySignerAppleCodesigningHashAgility(cms, 0, &hashAgilityV1.aref())) {
+ case noErr:
+ if (hashAgilityV1) {
+ CFRef<CFDictionaryRef> hashDict = makeCFDictionaryFrom(hashAgilityV1);
+ CFArrayRef cdList = CFArrayRef(CFDictionaryGetValue(hashDict, CFSTR("cdhashes")));
+ CFArrayRef myCdList = this->cdHashes();
+
+ /* Note that this is not very "agile": There's no way to calculate the exact
+ * list for comparison if it contains hash algorithms we don't know yet... */
+ if (cdList == NULL || !CFEqual(cdList, myCdList))
+ MacOSError::throwMe(errSecCSSignatureFailed);
+ }
+ break;
+ case -1: /* CMS used to return this for "no attribute found", so tolerate it. Now returning noErr/NULL */
+ break;
+ default:
+ MacOSError::throwMe(rc);
+ }
+
+ // retrieve auxiliary v2 data bag and verify against current state
+ CFRef<CFDictionaryRef> hashAgilityV2;
+ switch (OSStatus rc = CMSDecoderCopySignerAppleCodesigningHashAgilityV2(cms, 0, &hashAgilityV2.aref())) {
+ case noErr:
+ if (hashAgilityV2) {
+ /* Require number of code directoris and entries in the hash agility
+ * dict to be the same size (no stripping out code directories).
+ */
+ if (CFDictionaryGetCount(hashAgilityV2) != mCodeDirectories.size()) {
+ MacOSError::throwMe(errSecCSSignatureFailed);
+ }
+
+ /* Require every cdhash of every code directory whose hash
+ * algorithm we know to be in the agility dictionary.
+ *
+ * We check untruncated cdhashes here because we can.
+ */
+ bool foundOurs = false;
+ for (auto& entry : mCodeDirectories) {
+ SECOidTag tag = CodeDirectorySet::SECOidTagForAlgorithm(entry.first);
+
+ if (tag == SEC_OID_UNKNOWN) {
+ // Unknown hash algorithm, ignore.
+ continue;
+ }
+
+ CFRef<CFNumberRef> key = makeCFNumber(int(tag));
+ CFRef<CFDataRef> entryCdhash;
+ entryCdhash = (CFDataRef)CFDictionaryGetValue(hashAgilityV2, (void*)key.get());
+
+ CodeDirectory const *cd = (CodeDirectory const*)CFDataGetBytePtr(entry.second);
+ CFRef<CFDataRef> ourCdhash = cd->cdhash(false); // Untruncated cdhash!
+ if (!CFEqual(entryCdhash, ourCdhash)) {
+ MacOSError::throwMe(errSecCSSignatureFailed);
+ }
+
+ if (entry.first == this->hashAlgorithm()) {
+ foundOurs = true;
+ }
+ }
+
+ /* Require the cdhash of our chosen code directory to be in the dictionary.
+ * In theory, the dictionary could be full of unsupported cdhashes, but we
+ * really want ours, which is bound to be supported, to be covered.
+ */
+ if (!foundOurs) {
+ MacOSError::throwMe(errSecCSSignatureFailed);
+ }
+ }
+ break;
+ case -1: /* CMS used to return this for "no attribute found", so tolerate it. Now returning noErr/NULL */
+ break;
+ default:
+ MacOSError::throwMe(rc);
+ }
+