-/*
- * 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_utilities/unix++.h>
-#include <security_utilities/debugging.h>
-#include <Security/CSCommon.h>
-#include <security_utilities/unix++.h>
-#include <security_utilities/cfmunge.h>
-
-// These are pretty nasty, but are a quick safe fix
-// to pass information down to the gatekeeper collection tool
-extern "C" {
- int GKBIS_DS_Store_Present;
- int GKBIS_Dot_underbar_Present;
- int GKBIS_Num_localizations;
- int GKBIS_Num_files;
- int GKBIS_Num_dirs;
- int GKBIS_Num_symlinks;
-}
-
-namespace Security {
-namespace CodeSigning {
-
-
-static string removeTrailingSlash(string path)
-{
- if (path.substr(path.length()-2, 2) == "/.")
- return path.substr(0, path.length()-2);
- else if (path.substr(path.length()-1, 1) == "/")
- return path.substr(0, path.length()-1);
- else
- return path;
-}
-
-//
-// Construction and maintainance
-//
-ResourceBuilder::ResourceBuilder(const std::string &root, const std::string &relBase,
- CFDictionaryRef rulesDict, CodeDirectory::HashAlgorithm hashType, bool strict, const MacOSErrorSet& toleratedErrors)
- : mHashType(hashType),
- mCheckUnreadable(strict && toleratedErrors.find(errSecCSSignatureNotVerifiable) == toleratedErrors.end()),
- mCheckUnknownType(strict && toleratedErrors.find(errSecCSResourceNotSupported) == toleratedErrors.end())
-{
- assert(!root.empty());
- mRoot = removeTrailingSlash(root);
- mRelBase = removeTrailingSlash(relBase);
- if (mRoot != mRelBase && mRelBase != mRoot + "/Contents")
- MacOSError::throwMe(errSecCSInternalError);
- const char * paths[2] = { mRoot.c_str(), NULL };
- mFTS = fts_open((char * const *)paths, FTS_PHYSICAL | FTS_COMFOLLOW | FTS_NOCHDIR, NULL);
- if (!mFTS)
- UnixError::throwMe();
- mRawRules = rulesDict;
- CFDictionary rules(rulesDict, errSecCSResourceRulesInvalid);
- rules.apply(this, &ResourceBuilder::addRule);
-}
-
-ResourceBuilder::~ResourceBuilder()
-{
- for (Rules::iterator it = mRules.begin(); it != mRules.end(); ++it)
- delete *it;
- UnixPlusPlus::checkError(fts_close(mFTS));
-}
-
-
-//
-// 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;
- if (CFBooleanRef nestRef = rule.get<CFBooleanRef>("nested"))
- if (nestRef == kCFBooleanTrue)
- flags |= nested;
- if (CFBooleanRef topRef = rule.get<CFBooleanRef>("top"))
- if (topRef == kCFBooleanTrue)
- flags |= top;
- }
- addRule(new Rule(pattern, weight, flags));
-}
-
-static bool findStringEndingNoCase(const char *path, const char * end)
-{
- size_t len_path = strlen(path);
- size_t len_end = strlen(end);
-
- if (len_path >= len_end) {
- return strcasecmp(path + (len_path - len_end), end) == 0;
- } else
- return false;
-}
-
-//
-// Locate the next non-ignored file, look up its rule, and return it.
-// Returns NULL when we're out of files.
-//
-void ResourceBuilder::scan(Scanner next)
-{
- bool first = true;
-
- while (FTSENT *ent = fts_read(mFTS)) {
- const char *relpath = ent->fts_path + mRoot.size() + 1; // skip prefix + "/"
- std::string rp;
- if (mRelBase != mRoot) {
- assert(mRelBase == mRoot + "/Contents");
- rp = "../" + string(relpath);
- if (rp.substr(0, 12) == "../Contents/")
- rp = rp.substr(12);
- relpath = rp.c_str();
- }
- switch (ent->fts_info) {
- case FTS_F:
- secdebug("rdirenum", "file %s", ent->fts_path);
- GKBIS_Num_files++;
-
- // These are checks for the gatekeeper collection
- static const char underbar[] = "._";
- if (strncasecmp(ent->fts_name, underbar, strlen(underbar)) == 0)
- GKBIS_Dot_underbar_Present++;
-
- static const char ds_store[] = ".DS_Store";
- if (strcasecmp(ent->fts_name, ds_store) == 0)
- GKBIS_DS_Store_Present++;
-
- if (Rule *rule = findRule(relpath))
- if (!(rule->flags & (omitted | exclusion)))
- next(ent, rule->flags, relpath, rule);
- break;
- case FTS_SL:
- // symlinks cannot ever be nested code, so quietly convert to resource file
- secdebug("rdirenum", "symlink %s", ent->fts_path);
- GKBIS_Num_symlinks++;
-
- if (Rule *rule = findRule(relpath))
- if (!(rule->flags & (omitted | exclusion)))
- next(ent, rule->flags & ~nested, relpath, rule);
- break;
- case FTS_D:
- secdebug("rdirenum", "entering %s", ent->fts_path);
- GKBIS_Num_dirs++;
-
- if (!first) { // skip root directory (relpath invalid)
- if (Rule *rule = findRule(relpath)) {
- if (rule->flags & nested) {
- if (strchr(ent->fts_name, '.')) { // nested, has extension -> treat as nested bundle
- next(ent, rule->flags, relpath, rule);
- fts_set(mFTS, ent, FTS_SKIP);
- }
- } else if (rule->flags & exclusion) { // exclude the whole directory
- fts_set(mFTS, ent, FTS_SKIP);
- }
- // else treat as normal directory and descend into it
- }
- }
- // Report the number of localizations
- if (findStringEndingNoCase(ent->fts_name, ".lproj"))
- GKBIS_Num_localizations++;
- first = false;
-
- break;
- case FTS_DP:
- secdebug("rdirenum", "leaving %s", ent->fts_path);
- break;
- case FTS_DNR:
- secdebug("rdirenum", "cannot read directory %s", ent->fts_path);
- if (mCheckUnreadable)
- MacOSError::throwMe(errSecCSSignatureNotVerifiable);
- break;
- default:
- secdebug("rdirenum", "type %d (errno %d): %s",
- ent->fts_info, ent->fts_errno, ent->fts_path);
- if (mCheckUnknownType)
- MacOSError::throwMe(errSecCSResourceNotSupported);
- break;
- }
- }
-}
-
-
-//
-// Check a single for for inclusion in the resource envelope
-//
-bool ResourceBuilder::includes(string path) const
-{
- if (Rule *rule = findRule(path))
- return !(rule->flags & (omitted | exclusion));
- else
- return false;
-}
-
-
-//
-// Find the best-matching resource rule for an alleged resource file.
-// Returns NULL if no rule matches, or an exclusion rule applies.
-//
-ResourceBuilder::Rule *ResourceBuilder::findRule(string path) const
-{
- Rule *bestRule = NULL;
- secdebug("rscan", "test %s", path.c_str());
- for (Rules::const_iterator it = mRules.begin(); it != mRules.end(); ++it) {
- Rule *rule = *it;
- secdebug("rscan", "try %s", rule->source.c_str());
- if (rule->match(path.c_str())) {
- secdebug("rscan", "match");
- if (rule->flags & exclusion) {
- secdebug("rscan", "excluded");
- return rule;
- }
- if (!bestRule || rule->weight > bestRule->weight)
- bestRule = rule;
- }
- }
- secdebug("rscan", "choosing %s (%d,0x%x)",
- bestRule ? bestRule->source.c_str() : "NOTHING",
- bestRule ? bestRule->weight : 0,
- bestRule ? bestRule->flags : 0);
- return bestRule;
-}
-
-
-//
-// Hash a file and return a CFDataRef with the hash
-//
-CFDataRef ResourceBuilder::hashFile(const char *path) const
-{
- 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), source(pattern)
-{
- 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)
- : mDict(NULL), mHash(NULL), mRequirement(NULL), mLink(NULL), mFlags(0)
-{
- if (it == NULL)
- MacOSError::throwMe(errSecCSResourcesInvalid);
- if (CFGetTypeID(it) == CFDataGetTypeID()) {
- mHash = CFDataRef(it);
- } else {
- int optional = 0;
- mDict = CFDictionaryRef(it);
- bool err;
- if (CFDictionaryGetValue(mDict, CFSTR("requirement")))
- err = !cfscan(mDict, "{requirement=%SO,?optional=%B}", &mRequirement, &optional);
- else if (CFDictionaryGetValue(mDict, CFSTR("symlink")))
- err = !cfscan(mDict, "{symlink=%SO,?optional=%B}", &mLink, &optional);
- else
- err = !cfscan(mDict, "{hash=%XO,?optional=%B}", &mHash, &optional);
- if (err)
- MacOSError::throwMe(errSecCSResourcesInvalid);
- if (optional)
- mFlags |= ResourceBuilder::optional;
- if (mRequirement)
- mFlags |= ResourceBuilder::nested;
- }
-}
-
-
-} // end namespace CodeSigning
-} // end namespace Security
projects / apple / security.git / blobdiff