+/*
+ * Copyright (c) 2006-2010 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@
+ */
+
+//
+// resource directory construction and verification
+//
+#include "resources.h"
+#include "csutilities.h"
+#include <Security/CSCommon.h>
+#include <security_utilities/unix++.h>
+#include <security_utilities/cfmunge.h>
+
+namespace Security {
+namespace CodeSigning {
+
+
+//
+// Construction and maintainance
+//
+ResourceBuilder::ResourceBuilder(const std::string &root, CFDictionaryRef rulesDict, CodeDirectory::HashAlgorithm hashType)
+ : ResourceEnumerator(root), mHashType(hashType)
+{
+ CFDictionary rules(rulesDict, errSecCSResourceRulesInvalid);
+ rules.apply(this, &ResourceBuilder::addRule);
+ mRawRules = rules;
+}
+
+ResourceBuilder::~ResourceBuilder()
+{
+ for (Rules::iterator it = mRules.begin(); it != mRules.end(); ++it)
+ delete *it;
+}
+
+
+//
+// Parse and add one matching rule
+//
+void ResourceBuilder::addRule(CFTypeRef key, CFTypeRef value)
+{
+ string pattern = cfString(key, errSecCSResourceRulesInvalid);
+ unsigned weight = 1;
+ uint32_t flags = 0;
+ if (CFGetTypeID(value) == CFBooleanGetTypeID()) {
+ if (value == kCFBooleanFalse)
+ flags |= omitted;
+ } else {
+ CFDictionary rule(value, errSecCSResourceRulesInvalid);
+ if (CFNumberRef weightRef = rule.get<CFNumberRef>("weight"))
+ weight = cfNumber<unsigned int>(weightRef);
+ if (CFBooleanRef omitRef = rule.get<CFBooleanRef>("omit"))
+ if (omitRef == kCFBooleanTrue)
+ flags |= omitted;
+ if (CFBooleanRef optRef = rule.get<CFBooleanRef>("optional"))
+ if (optRef == kCFBooleanTrue)
+ flags |= optional;
+ }
+ addRule(new Rule(pattern, weight, flags));
+}
+
+
+//
+// Locate the next non-ignored file, look up its rule, and return it.
+// Returns NULL when we're out of files.
+//
+FTSENT *ResourceBuilder::next(string &path, Rule * &rule)
+{
+ while (FTSENT *ent = ResourceEnumerator::next(path)) {
+ // find best matching rule
+ Rule *bestRule = NULL;
+ for (Rules::const_iterator it = mRules.begin(); it != mRules.end(); ++it) {
+ Rule *rule = *it;
+ if (rule->match(path.c_str())) {
+ if (rule->flags & exclusion) {
+ bestRule = NULL;
+ break;
+ }
+ if (!bestRule || rule->weight > bestRule->weight)
+ bestRule = rule;
+ }
+ }
+ if (!bestRule || (bestRule->flags & omitted))
+ continue;
+ rule = bestRule;
+ return ent;
+ }
+ return NULL;
+}
+
+
+//
+// Build the ResourceDirectory given the currently established rule set.
+//
+CFDictionaryRef ResourceBuilder::build()
+{
+ secdebug("codesign", "start building resource directory");
+ CFRef<CFMutableDictionaryRef> files = makeCFMutableDictionary();
+
+ string path;
+ Rule *rule;
+ while (FTSENT *ent = next(path, rule)) {
+ assert(rule);
+ CFRef<CFDataRef> hash = hashFile(ent->fts_accpath);
+ if (rule->flags == 0) { // default case - plain hash
+ cfadd(files, "{%s=%O}", path.c_str(), hash.get());
+ secdebug("csresource", "%s added simple (rule %p)", path.c_str(), rule);
+ } else { // more complicated - use a sub-dictionary
+ cfadd(files, "{%s={hash=%O,optional=%B}}",
+ path.c_str(), hash.get(), rule->flags & optional);
+ secdebug("csresource", "%s added complex (rule %p)", path.c_str(), rule);
+ }
+ }
+ secdebug("codesign", "finished code directory with %d entries",
+ int(CFDictionaryGetCount(files)));
+
+ return cfmake<CFDictionaryRef>("{rules=%O,files=%O}", mRawRules.get(), files.get());
+}
+
+
+//
+// Hash a file and return a CFDataRef with the hash
+//
+CFDataRef ResourceBuilder::hashFile(const char *path)
+{
+ UnixPlusPlus::AutoFileDesc fd(path);
+ fd.fcntl(F_NOCACHE, true); // turn off page caching (one-pass)
+ MakeHash<ResourceBuilder> hasher(this);
+ hashFileData(fd, hasher.get());
+ Hashing::Byte digest[hasher->digestLength()];
+ hasher->finish(digest);
+ return CFDataCreate(NULL, digest, sizeof(digest));
+}
+
+
+//
+// Regex matching objects
+//
+ResourceBuilder::Rule::Rule(const std::string &pattern, unsigned w, uint32_t f)
+ : weight(w), flags(f)
+{
+ if (::regcomp(this, pattern.c_str(), REG_EXTENDED | REG_NOSUB)) //@@@ REG_ICASE?
+ MacOSError::throwMe(errSecCSResourceRulesInvalid);
+ secdebug("csresource", "%p rule %s added (weight %d, flags 0x%x)",
+ this, pattern.c_str(), w, f);
+}
+
+ResourceBuilder::Rule::~Rule()
+{
+ ::regfree(this);
+}
+
+bool ResourceBuilder::Rule::match(const char *s) const
+{
+ switch (::regexec(this, s, 0, NULL, 0)) {
+ case 0:
+ return true;
+ case REG_NOMATCH:
+ return false;
+ default:
+ MacOSError::throwMe(errSecCSResourceRulesInvalid);
+ }
+}
+
+
+std::string ResourceBuilder::escapeRE(const std::string &s)
+{
+ string r;
+ for (string::const_iterator it = s.begin(); it != s.end(); ++it) {
+ char c = *it;
+ if (strchr("\\[]{}().+*", c))
+ r.push_back('\\');
+ r.push_back(c);
+ }
+ return r;
+}
+
+
+//
+// Resource Seals
+//
+ResourceSeal::ResourceSeal(CFTypeRef it)
+{
+ if (it == NULL)
+ MacOSError::throwMe(errSecCSResourcesInvalid);
+ if (CFGetTypeID(it) == CFDataGetTypeID()) {
+ mHash = CFDataRef(it);
+ mOptional = false;
+ } else {
+ mOptional = false;
+ if (!cfscan(it, "{hash=%XO,?optional=%B}", &mHash, &mOptional))
+ MacOSError::throwMe(errSecCSResourcesInvalid);
+ }
+}
+
+
+} // end namespace CodeSigning
+} // end namespace Security
projects / apple / security.git / blobdiff