Security-55163.44.tar.gz

[apple/security.git] / libsecurity_codesigning / lib / detachedrep.cpp

diff --git a/libsecurity_codesigning/lib/detachedrep.cpp b/libsecurity_codesigning/lib/detachedrep.cpp
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+++ b/libsecurity_codesigning/lib/detachedrep.cpp
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+/*
+ * Copyright (c) 2006-2008 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+//
+// detachedrep - prefix diskrep representing a detached signature stored in a file
+//
+#include "detachedrep.h"
+
+
+namespace Security {
+namespace CodeSigning {
+
+
+//
+// We construct a DetachedRep from the data blob of the detached signature
+// and a reference of the original DiskRep we chain to.
+// We accept an EmbeddedSignatureBlob (for a non-architected signature)
+// or a DetachedSignatureBlob (for architected signatures) that is a SuperBlob
+// of EmbeddedSignatureBlobs.
+//
+DetachedRep::DetachedRep(CFDataRef sig, DiskRep *orig, const std::string &source)
+       : FilterRep(orig), mSig(sig), mSource(source)
+{
+       const BlobCore *sigBlob = reinterpret_cast<const BlobCore *>(CFDataGetBytePtr(sig));
+       if (sigBlob->is<EmbeddedSignatureBlob>()) {             // architecture-less
+               if ((mArch = EmbeddedSignatureBlob::specific(sigBlob))) {
+                       mGlobal = NULL;
+                       CODESIGN_DISKREP_CREATE_DETACHED(this, orig, (char*)source.c_str(), NULL);
+                       return;
+               }
+       } else if (sigBlob->is<DetachedSignatureBlob>())        // architecture collection
+               if (const DetachedSignatureBlob *dsblob = DetachedSignatureBlob::specific(sigBlob))
+                       if (Universal *fat = orig->mainExecutableImage())
+                               if (const BlobCore *blob = dsblob->find(fat->bestNativeArch().cpuType()))
+                                       if ((mArch = EmbeddedSignatureBlob::specific(blob)))
+                                               if ((mGlobal = EmbeddedSignatureBlob::specific(dsblob->find(0)))) {
+                                                       CODESIGN_DISKREP_CREATE_DETACHED(this, orig, (char*)source.c_str(), (void*)mGlobal);
+                                                       return;
+                                               }
+       MacOSError::throwMe(errSecCSSignatureInvalid);
+}
+
+
+//
+// Here's a version to construct a DetachedRep if we already have the right architecture
+// and (optional) associated global blob. Just take them.
+//
+DetachedRep::DetachedRep(CFDataRef sig, CFDataRef gsig, DiskRep *orig, const std::string &source)
+       : FilterRep(orig), mSig(sig), mGSig(gsig), mSource(source)
+{
+       const BlobCore *sigBlob = reinterpret_cast<const BlobCore *>(CFDataGetBytePtr(sig));
+       mArch = EmbeddedSignatureBlob::specific(sigBlob);
+       if (!mArch)
+               MacOSError::throwMe(errSecCSSignatureInvalid);
+       if (gsig) {
+               const BlobCore *gsigBlob = reinterpret_cast<const BlobCore *>(CFDataGetBytePtr(gsig));
+               mGlobal = EmbeddedSignatureBlob::specific(gsigBlob);
+               if (!mGlobal)
+                       MacOSError::throwMe(errSecCSSignatureInvalid);
+       } else
+               mGlobal = NULL;
+       CODESIGN_DISKREP_CREATE_DETACHED(this, orig, (char*)source.c_str(), (void*)mGlobal);
+}
+
+
+//
+// We look up components by first checking for a per-architecture item,
+// then for a global item in the detached signature, and finally falling
+// back on the original DiskRep (for static components).
+//
+CFDataRef DetachedRep::component(CodeDirectory::SpecialSlot slot)
+{
+       if (CFDataRef result = mArch->component(slot))
+               return result;
+       if (mGlobal)
+               if (CFDataRef result = mGlobal->component(slot))
+                       return result;
+       return this->base()->component(slot);
+}
+
+
+} // end namespace CodeSigning
+} // end namespace Security