[apple/security.git] / OSX / include / security_codesigning / resources.cpp

/*
 * Copyright (c) 2006-2014 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());
	char realroot[PATH_MAX];
	if (realpath(root.c_str(), realroot) == NULL)
		UnixError::throwMe();
	mRoot = realroot;
	if (realpath(removeTrailingSlash(relBase).c_str(), realroot) == NULL)
		UnixError::throwMe();
	mRelBase = realroot;
	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;
	fts_close(mFTS);	// do not check error - it's not worth aborting over (double fault etc.)
}


//
// 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;
	}
	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)) {
		static const char ds_store[] = ".DS_Store";
		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++;

			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, string(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 (strcasecmp(ent->fts_name, ds_store) == 0)
				MacOSError::throwMe(errSecCSDSStoreSymlink);
                
			if (Rule *rule = findRule(relpath))
				if (!(rule->flags & (omitted | exclusion)))
					next(ent, rule->flags & ~nested, string(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, string(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
{
	// process first-directory exclusions
	size_t firstslash = path.find('/');
	if (firstslash != string::npos)
		if (Rule *rule = findRule(path.substr(0, firstslash)))
			if (rule->flags & exclusion)
				return rule->flags & softTarget;
	
	// process full match
	if (Rule *rule = findRule(path))
		return !(rule->flags & (omitted | exclusion)) || (rule->flags & softTarget);
	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
Commit	Line	Data
b1ab9ed8	1	/*
d8f41ccd	2	* Copyright (c) 2006-2014 Apple Inc. All Rights Reserved.
b1ab9ed8 A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23
	24	//
	25	// resource directory construction and verification
	26	//
	27	#include "resources.h"
	28	#include "csutilities.h"
427c49bc A	29	#include <security_utilities/unix++.h>
427c49bc A	30	#include <security_utilities/debugging.h>
b1ab9ed8 A	31	#include <Security/CSCommon.h>
	32	#include <security_utilities/unix++.h>
	33	#include <security_utilities/cfmunge.h>
	34
e3d3b979 A	35	// These are pretty nasty, but are a quick safe fix
	36	// to pass information down to the gatekeeper collection tool
	37	extern "C" {
	38	int GKBIS_DS_Store_Present;
	39	int GKBIS_Dot_underbar_Present;
	40	int GKBIS_Num_localizations;
	41	int GKBIS_Num_files;
	42	int GKBIS_Num_dirs;
	43	int GKBIS_Num_symlinks;
	44	}
	45
b1ab9ed8 A	46	namespace Security {
	47	namespace CodeSigning {
	48
	49
80e23899 A	50	static string removeTrailingSlash(string path)
	51	{
	52	if (path.substr(path.length()-2, 2) == "/.")
	53	return path.substr(0, path.length()-2);
	54	else if (path.substr(path.length()-1, 1) == "/")
	55	return path.substr(0, path.length()-1);
	56	else
	57	return path;
	58	}
	59
b1ab9ed8 A	60	//
	61	// Construction and maintainance
	62	//
80e23899 A	63	ResourceBuilder::ResourceBuilder(const std::string &root, const std::string &relBase,
	64	CFDictionaryRef rulesDict, CodeDirectory::HashAlgorithm hashType, bool strict, const MacOSErrorSet& toleratedErrors)
	65	: mHashType(hashType),
	66	mCheckUnreadable(strict && toleratedErrors.find(errSecCSSignatureNotVerifiable) == toleratedErrors.end()),
	67	mCheckUnknownType(strict && toleratedErrors.find(errSecCSResourceNotSupported) == toleratedErrors.end())
b1ab9ed8	68	{
80e23899	69	assert(!root.empty());
5c19dc3a A	70	char realroot[PATH_MAX];
	71	if (realpath(root.c_str(), realroot) == NULL)
	72	UnixError::throwMe();
	73	mRoot = realroot;
	74	if (realpath(removeTrailingSlash(relBase).c_str(), realroot) == NULL)
	75	UnixError::throwMe();
	76	mRelBase = realroot;
80e23899 A	77	if (mRoot != mRelBase && mRelBase != mRoot + "/Contents")
80e23899 A	78	MacOSError::throwMe(errSecCSInternalError);
427c49bc A	79	const char * paths[2] = { mRoot.c_str(), NULL };
	80	mFTS = fts_open((char * const *)paths, FTS_PHYSICAL \| FTS_COMFOLLOW \| FTS_NOCHDIR, NULL);
	81	if (!mFTS)
	82	UnixError::throwMe();
	83	mRawRules = rulesDict;
b1ab9ed8 A	84	CFDictionary rules(rulesDict, errSecCSResourceRulesInvalid);
b1ab9ed8 A	85	rules.apply(this, &ResourceBuilder::addRule);
b1ab9ed8 A	86	}
	87
	88	ResourceBuilder::~ResourceBuilder()
	89	{
	90	for (Rules::iterator it = mRules.begin(); it != mRules.end(); ++it)
	91	delete *it;
d8f41ccd	92	fts_close(mFTS); // do not check error - it's not worth aborting over (double fault etc.)
b1ab9ed8 A	93	}
	94
	95
	96	//
	97	// Parse and add one matching rule
	98	//
	99	void ResourceBuilder::addRule(CFTypeRef key, CFTypeRef value)
	100	{
	101	string pattern = cfString(key, errSecCSResourceRulesInvalid);
	102	unsigned weight = 1;
	103	uint32_t flags = 0;
	104	if (CFGetTypeID(value) == CFBooleanGetTypeID()) {
	105	if (value == kCFBooleanFalse)
	106	flags \|= omitted;
	107	} else {
	108	CFDictionary rule(value, errSecCSResourceRulesInvalid);
	109	if (CFNumberRef weightRef = rule.get<CFNumberRef>("weight"))
	110	weight = cfNumber<unsigned int>(weightRef);
	111	if (CFBooleanRef omitRef = rule.get<CFBooleanRef>("omit"))
	112	if (omitRef == kCFBooleanTrue)
	113	flags \|= omitted;
	114	if (CFBooleanRef optRef = rule.get<CFBooleanRef>("optional"))
	115	if (optRef == kCFBooleanTrue)
	116	flags \|= optional;
427c49bc A	117	if (CFBooleanRef nestRef = rule.get<CFBooleanRef>("nested"))
	118	if (nestRef == kCFBooleanTrue)
	119	flags \|= nested;
b1ab9ed8 A	120	}
	121	addRule(new Rule(pattern, weight, flags));
	122	}
	123
e3d3b979 A	124	static bool findStringEndingNoCase(const char path, const char end)
	125	{
	126	size_t len_path = strlen(path);
	127	size_t len_end = strlen(end);
	128
	129	if (len_path >= len_end) {
	130	return strcasecmp(path + (len_path - len_end), end) == 0;
	131	} else
	132	return false;
	133	}
b1ab9ed8 A	134
	135	//
	136	// Locate the next non-ignored file, look up its rule, and return it.
	137	// Returns NULL when we're out of files.
	138	//
427c49bc	139	void ResourceBuilder::scan(Scanner next)
b1ab9ed8	140	{
427c49bc	141	bool first = true;
e3d3b979	142
427c49bc	143	while (FTSENT *ent = fts_read(mFTS)) {
d8f41ccd	144	static const char ds_store[] = ".DS_Store";
427c49bc	145	const char *relpath = ent->fts_path + mRoot.size() + 1; // skip prefix + "/"
80e23899 A	146	std::string rp;
	147	if (mRelBase != mRoot) {
	148	assert(mRelBase == mRoot + "/Contents");
	149	rp = "../" + string(relpath);
	150	if (rp.substr(0, 12) == "../Contents/")
	151	rp = rp.substr(12);
	152	relpath = rp.c_str();
	153	}
427c49bc A	154	switch (ent->fts_info) {
	155	case FTS_F:
	156	secdebug("rdirenum", "file %s", ent->fts_path);
e3d3b979 A	157	GKBIS_Num_files++;
	158
	159	// These are checks for the gatekeeper collection
	160	static const char underbar[] = "._";
	161	if (strncasecmp(ent->fts_name, underbar, strlen(underbar)) == 0)
	162	GKBIS_Dot_underbar_Present++;
	163
e3d3b979 A	164	if (strcasecmp(ent->fts_name, ds_store) == 0)
	165	GKBIS_DS_Store_Present++;
	166
427c49bc A	167	if (Rule *rule = findRule(relpath))
427c49bc A	168	if (!(rule->flags & (omitted \| exclusion)))
d87e1158	169	next(ent, rule->flags, string(relpath), rule);
427c49bc A	170	break;
	171	case FTS_SL:
	172	// symlinks cannot ever be nested code, so quietly convert to resource file
	173	secdebug("rdirenum", "symlink %s", ent->fts_path);
e3d3b979	174	GKBIS_Num_symlinks++;
d8f41ccd A	175
	176	if (strcasecmp(ent->fts_name, ds_store) == 0)
	177	MacOSError::throwMe(errSecCSDSStoreSymlink);
e3d3b979	178
427c49bc A	179	if (Rule *rule = findRule(relpath))
427c49bc A	180	if (!(rule->flags & (omitted \| exclusion)))
d87e1158	181	next(ent, rule->flags & ~nested, string(relpath), rule);
427c49bc A	182	break;
	183	case FTS_D:
	184	secdebug("rdirenum", "entering %s", ent->fts_path);
e3d3b979 A	185	GKBIS_Num_dirs++;
e3d3b979 A	186
427c49bc A	187	if (!first) { // skip root directory (relpath invalid)
	188	if (Rule *rule = findRule(relpath)) {
	189	if (rule->flags & nested) {
	190	if (strchr(ent->fts_name, '.')) { // nested, has extension -> treat as nested bundle
d87e1158	191	next(ent, rule->flags, string(relpath), rule);
427c49bc A	192	fts_set(mFTS, ent, FTS_SKIP);
	193	}
	194	} else if (rule->flags & exclusion) { // exclude the whole directory
	195	fts_set(mFTS, ent, FTS_SKIP);
	196	}
	197	// else treat as normal directory and descend into it
b1ab9ed8	198	}
427c49bc	199	}
e3d3b979 A	200	// Report the number of localizations
	201	if (findStringEndingNoCase(ent->fts_name, ".lproj"))
	202	GKBIS_Num_localizations++;
427c49bc	203	first = false;
e3d3b979	204
427c49bc A	205	break;
	206	case FTS_DP:
	207	secdebug("rdirenum", "leaving %s", ent->fts_path);
	208	break;
80e23899 A	209	case FTS_DNR:
	210	secdebug("rdirenum", "cannot read directory %s", ent->fts_path);
	211	if (mCheckUnreadable)
	212	MacOSError::throwMe(errSecCSSignatureNotVerifiable);
	213	break;
427c49bc A	214	default:
	215	secdebug("rdirenum", "type %d (errno %d): %s",
	216	ent->fts_info, ent->fts_errno, ent->fts_path);
80e23899 A	217	if (mCheckUnknownType)
80e23899 A	218	MacOSError::throwMe(errSecCSResourceNotSupported);
427c49bc	219	break;
b1ab9ed8	220	}
b1ab9ed8	221	}
b1ab9ed8 A	222	}
	223
	224
	225	//
427c49bc A	226	// Check a single for for inclusion in the resource envelope
	227	//
	228	bool ResourceBuilder::includes(string path) const
	229	{
5c19dc3a A	230	// process first-directory exclusions
	231	size_t firstslash = path.find('/');
	232	if (firstslash != string::npos)
	233	if (Rule *rule = findRule(path.substr(0, firstslash)))
	234	if (rule->flags & exclusion)
	235	return rule->flags & softTarget;
	236
	237	// process full match
427c49bc	238	if (Rule *rule = findRule(path))
5c19dc3a	239	return !(rule->flags & (omitted \| exclusion)) \|\| (rule->flags & softTarget);
427c49bc A	240	else
	241	return false;
	242	}
	243
	244
	245	//
	246	// Find the best-matching resource rule for an alleged resource file.
	247	// Returns NULL if no rule matches, or an exclusion rule applies.
b1ab9ed8	248	//
427c49bc	249	ResourceBuilder::Rule *ResourceBuilder::findRule(string path) const
b1ab9ed8	250	{
427c49bc A	251	Rule *bestRule = NULL;
	252	secdebug("rscan", "test %s", path.c_str());
	253	for (Rules::const_iterator it = mRules.begin(); it != mRules.end(); ++it) {
	254	Rule rule = it;
	255	secdebug("rscan", "try %s", rule->source.c_str());
	256	if (rule->match(path.c_str())) {
	257	secdebug("rscan", "match");
	258	if (rule->flags & exclusion) {
	259	secdebug("rscan", "excluded");
	260	return rule;
	261	}
	262	if (!bestRule \|\| rule->weight > bestRule->weight)
	263	bestRule = rule;
b1ab9ed8 A	264	}
b1ab9ed8 A	265	}
427c49bc A	266	secdebug("rscan", "choosing %s (%d,0x%x)",
	267	bestRule ? bestRule->source.c_str() : "NOTHING",
	268	bestRule ? bestRule->weight : 0,
	269	bestRule ? bestRule->flags : 0);
	270	return bestRule;
b1ab9ed8 A	271	}
	272
	273
	274	//
	275	// Hash a file and return a CFDataRef with the hash
	276	//
427c49bc	277	CFDataRef ResourceBuilder::hashFile(const char *path) const
b1ab9ed8 A	278	{
	279	UnixPlusPlus::AutoFileDesc fd(path);
	280	fd.fcntl(F_NOCACHE, true); // turn off page caching (one-pass)
	281	MakeHash<ResourceBuilder> hasher(this);
	282	hashFileData(fd, hasher.get());
	283	Hashing::Byte digest[hasher->digestLength()];
	284	hasher->finish(digest);
	285	return CFDataCreate(NULL, digest, sizeof(digest));
	286	}
	287
	288
	289	//
	290	// Regex matching objects
	291	//
	292	ResourceBuilder::Rule::Rule(const std::string &pattern, unsigned w, uint32_t f)
427c49bc	293	: weight(w), flags(f), source(pattern)
b1ab9ed8 A	294	{
	295	if (::regcomp(this, pattern.c_str(), REG_EXTENDED \| REG_NOSUB)) //@@@ REG_ICASE?
	296	MacOSError::throwMe(errSecCSResourceRulesInvalid);
	297	secdebug("csresource", "%p rule %s added (weight %d, flags 0x%x)",
	298	this, pattern.c_str(), w, f);
	299	}
	300
	301	ResourceBuilder::Rule::~Rule()
	302	{
	303	::regfree(this);
	304	}
	305
	306	bool ResourceBuilder::Rule::match(const char *s) const
	307	{
	308	switch (::regexec(this, s, 0, NULL, 0)) {
	309	case 0:
	310	return true;
	311	case REG_NOMATCH:
	312	return false;
	313	default:
	314	MacOSError::throwMe(errSecCSResourceRulesInvalid);
	315	}
	316	}
	317
	318
	319	std::string ResourceBuilder::escapeRE(const std::string &s)
	320	{
	321	string r;
	322	for (string::const_iterator it = s.begin(); it != s.end(); ++it) {
	323	char c = *it;
d8f41ccd	324	if (strchr("\\[]{}().+*?", c))
b1ab9ed8 A	325	r.push_back('\\');
	326	r.push_back(c);
	327	}
	328	return r;
	329	}
	330
	331
	332	//
	333	// Resource Seals
	334	//
	335	ResourceSeal::ResourceSeal(CFTypeRef it)
427c49bc	336	: mDict(NULL), mHash(NULL), mRequirement(NULL), mLink(NULL), mFlags(0)
b1ab9ed8 A	337	{
	338	if (it == NULL)
	339	MacOSError::throwMe(errSecCSResourcesInvalid);
	340	if (CFGetTypeID(it) == CFDataGetTypeID()) {
	341	mHash = CFDataRef(it);
b1ab9ed8	342	} else {
427c49bc A	343	int optional = 0;
	344	mDict = CFDictionaryRef(it);
	345	bool err;
	346	if (CFDictionaryGetValue(mDict, CFSTR("requirement")))
	347	err = !cfscan(mDict, "{requirement=%SO,?optional=%B}", &mRequirement, &optional);
	348	else if (CFDictionaryGetValue(mDict, CFSTR("symlink")))
	349	err = !cfscan(mDict, "{symlink=%SO,?optional=%B}", &mLink, &optional);
	350	else
	351	err = !cfscan(mDict, "{hash=%XO,?optional=%B}", &mHash, &optional);
	352	if (err)
b1ab9ed8	353	MacOSError::throwMe(errSecCSResourcesInvalid);
427c49bc A	354	if (optional)
	355	mFlags \|= ResourceBuilder::optional;
	356	if (mRequirement)
	357	mFlags \|= ResourceBuilder::nested;
b1ab9ed8 A	358	}
	359	}
	360
	361
	362	} // end namespace CodeSigning
	363	} // end namespace Security