X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurity_codesigning/lib/detachedrep.cpp

diff --git a/Security/libsecurity_codesigning/lib/detachedrep.cpp b/Security/libsecurity_codesigning/lib/detachedrep.cpp
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+/*
+ * Copyright (c) 2006-2008,2011-2012 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), mFull(true), 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), mFull(false), 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