Security-55163.44.tar.gz

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

diff --git a/libsecurity_codesigning/lib/requirement.cpp b/libsecurity_codesigning/lib/requirement.cpp
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+/*
+ * Copyright (c) 2006-2012 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@
+ */
+
+//
+// requirement - Code Requirement Blob description
+//
+#include "requirement.h"
+#include "reqinterp.h"
+#include "codesigning_dtrace.h"
+#include <security_utilities/errors.h>
+#include <security_utilities/unix++.h>
+#include <security_utilities/logging.h>
+#include <security_utilities/cfutilities.h>
+#include <security_utilities/hashing.h>
+
+#ifdef DEBUGDUMP
+#include <security_codesigning/reqdumper.h>
+#endif
+
+namespace Security {
+namespace CodeSigning {
+
+
+//
+// The (SHA-1) hash of the canonical Apple certificate root anchor
+//
+static const SHA1::Digest gAppleAnchorHash =
+       { 0x61, 0x1e, 0x5b, 0x66, 0x2c, 0x59, 0x3a, 0x08, 0xff, 0x58,
+         0xd1, 0x4a, 0xe2, 0x24, 0x52, 0xd1, 0x98, 0xdf, 0x6c, 0x60 };
+
+
+//
+// Canonical names for requirement types
+//
+const char *const Requirement::typeNames[] = {
+       "invalid",
+       "host",
+       "guest",
+       "designated",
+       "library",
+       "plugin",
+};
+
+
+//
+// validate a requirement against a code context
+//
+void Requirement::validate(const Requirement::Context &ctx, OSStatus failure /* = errSecCSReqFailed */) const
+{
+       if (!this->validates(ctx, failure))
+               MacOSError::throwMe(failure);
+}
+
+bool Requirement::validates(const Requirement::Context &ctx, OSStatus failure /* = errSecCSReqFailed */) const
+{
+       CODESIGN_EVAL_REQINT_START((void*)this, this->length());
+       switch (kind()) {
+       case exprForm:
+               if (Requirement::Interpreter(this, &ctx).evaluate()) {
+                       CODESIGN_EVAL_REQINT_END(this, 0);
+                       return true;
+               } else {
+                       CODESIGN_EVAL_REQINT_END(this, failure);
+                       return false;
+               }
+       default:
+               CODESIGN_EVAL_REQINT_END(this, errSecCSReqUnsupported);
+               MacOSError::throwMe(errSecCSReqUnsupported);
+       }
+}
+
+
+//
+// Retrieve one certificate from the cert chain.
+// Positive and negative indices can be used:
+//    [ leaf, intermed-1, ..., intermed-n, anchor ]
+//        0       1       ...     -2         -1
+// Returns NULL if unavailable for any reason.
+//     
+SecCertificateRef Requirement::Context::cert(int ix) const
+{
+       if (certs) {
+               if (ix < 0)
+                       ix += certCount();
+               if (ix >= CFArrayGetCount(certs))
+                   return NULL;
+               if (CFTypeRef element = CFArrayGetValueAtIndex(certs, ix))
+                       return SecCertificateRef(element);
+       }
+       return NULL;
+}
+
+unsigned int Requirement::Context::certCount() const
+{
+       if (certs)
+               return CFArrayGetCount(certs);
+       else
+               return 0;
+}
+
+
+//
+// Return the hash of the canonical Apple certificate root (anchor).
+// In a special test mode, also return an alternate root hash for testing.
+//
+const SHA1::Digest &Requirement::appleAnchorHash()
+{
+       return gAppleAnchorHash;
+}
+
+#if defined(TEST_APPLE_ANCHOR)
+
+const char Requirement::testAppleAnchorEnv[] = "TEST_APPLE_ANCHOR";
+
+const SHA1::Digest &Requirement::testAppleAnchorHash()
+{
+       static bool tried = false;
+       static SHA1::Digest testHash;
+       if (!tried) {
+               // see if we have one configured
+               if (const char *path = getenv(testAppleAnchorEnv))
+                       try {
+                               UnixPlusPlus::FileDesc fd(path);
+                               char buffer[2048];              // arbitrary limit
+                               size_t size = fd.read(buffer, sizeof(buffer));
+                               SHA1 hash;
+                               hash(buffer, size);
+                               hash.finish(testHash);
+                               Syslog::alert("ACCEPTING TEST AUTHORITY %s FOR APPLE CODE IDENTITY", path);
+                       } catch (...) { }
+               tried = true;
+       }
+       return testHash;                // will be zeroes (no match) if not configured
+}
+
+#endif //TEST_APPLE_ANCHOR
+
+
+//
+// Debug dump support
+//
+#ifdef DEBUGDUMP
+
+void Requirement::dump() const
+{
+       Debug::dump("%s\n", Dumper::dump(this).c_str());
+}
+
+#endif //DEBUGDUMP
+
+
+}      // CodeSigning
+}      // Security