OSX/utilities/src/SecFileLocations.c

   1 /*
   2  * Copyright (c) 2012-2016 Apple Inc. All Rights Reserved.
   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 //  SecFileLocations.c
  26 //  utilities
  27 //
  28
  29 /*
  30     This file incorporates code from securityd_files.c (iOS) and iOSforOSX.c (OSX).
  31  */
  32
  33 #include <TargetConditionals.h>
  34 #include <AssertMacros.h>
  35 #include <CoreFoundation/CFPriv.h>
  36 #include <CoreFoundation/CFString.h>
  37 #include <CoreFoundation/CFURL.h>
  38 #include <CoreFoundation/CFUtilities.h>
  39 #include <utilities/SecCFWrappers.h>
  40 #include <utilities/SecCFRelease.h>
  41 #include <sys/stat.h>
  42 #include <uuid/uuid.h>
  43 #include <copyfile.h>
  44 #include <syslog.h>
  45
  46 #include "SecFileLocations.h"
  47
  48 static CFURLRef sCustomHomeURL = NULL;
  49
  50 static CFURLRef SecCopyHomeURL(void)
  51 {
  52     // This returns a CFURLRef so that it can be passed as the second parameter
  53     // to CFURLCreateCopyAppendingPathComponent
  54
  55     CFURLRef homeURL = sCustomHomeURL;
  56     if (homeURL) {
  57         CFRetain(homeURL);
  58     } else {
  59 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
  60         // We would use CFCopyHomeDirectoryURL but it doesn't exist on MACOS.
  61         // This does the same.
  62         homeURL = CFCopyHomeDirectoryURLForUser(NULL);
  63 #else
  64         homeURL = CFCopyHomeDirectoryURL();
  65 #endif
  66     }
  67
  68     return homeURL;
  69 }
  70
  71 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
  72 static const char * get_host_uuid()
  73 {
  74     static uuid_string_t hostuuid = {};
  75     static dispatch_once_t onceToken;
  76     dispatch_once(&onceToken, ^{
  77         struct timespec timeout = {30, 0};
  78         uuid_t uuid = {};
  79         if (gethostuuid(uuid, &timeout) == 0) {
  80             uuid_unparse(uuid, hostuuid);
  81         } else {
  82             secerror("failed to get host uuid");
  83         }
  84     });
  85
  86     return hostuuid;
  87 }
  88
  89 static CFStringRef copy_keychain_uuid_path(CFURLRef keyChainBaseURL)
  90 {
  91     CFStringRef baseURLString = NULL;
  92     CFStringRef uuid_path = NULL;
  93
  94     require(keyChainBaseURL, done);
  95
  96     baseURLString = CFURLCopyFileSystemPath(keyChainBaseURL, kCFURLPOSIXPathStyle);
  97     require(baseURLString, done);
  98
  99     uuid_path = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%@/%s"), baseURLString, get_host_uuid());
 100
 101 done:
 102     CFReleaseSafe(baseURLString);
 103     return uuid_path;
 104 }
 105
 106 // See _kb_verify_create_path in securityd
 107 static bool keychain_verify_create_path(const char *keychainBasePath)
 108 {
 109     bool created = false;
 110     struct stat st_info = {};
 111     char new_path[PATH_MAX] = {};
 112     char kb_path[PATH_MAX] = {};
 113     snprintf(kb_path, sizeof(kb_path), "%s", keychainBasePath);
 114     if (lstat(kb_path, &st_info) == 0) {
 115         if (S_ISDIR(st_info.st_mode)) {
 116             created = true;
 117         } else {
 118             secerror("invalid directory at '%s' moving aside", kb_path);
 119             snprintf(new_path, sizeof(new_path), "%s-invalid", kb_path);
 120             unlink(new_path);
 121             if (rename(kb_path, new_path) != 0) {
 122                 secerror("failed to rename file: %s (%s)", kb_path, strerror(errno));
 123                 goto done;
 124             }
 125         }
 126     }
 127     if (!created) {
 128         require_action(mkpath_np(kb_path, 0700) == 0, done, secerror("could not create path: %s (%s)", kb_path, strerror(errno)));
 129         created = true;
 130     }
 131
 132 done:
 133     return created;
 134 }
 135 #endif /*(TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) */
 136
 137 static CFURLRef SecCopyBaseFilesURL()
 138 {
 139     CFURLRef baseURL = sCustomHomeURL;
 140     if (baseURL) {
 141         CFRetain(baseURL);
 142     } else {
 143 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED))
 144         baseURL = SecCopyHomeURL();
 145 #else
 146         baseURL = CFURLCreateWithFileSystemPath(NULL, CFSTR("/"), kCFURLPOSIXPathStyle, true);
 147 #endif
 148     }
 149     return baseURL;
 150 }
 151
 152 static CFURLRef SecCopyURLForFileInBaseDirectory(CFStringRef directoryPath, CFStringRef fileName)
 153 {
 154     CFURLRef fileURL = NULL;
 155     CFStringRef suffix = NULL;
 156     CFURLRef homeURL = SecCopyBaseFilesURL();
 157
 158     if (fileName)
 159         suffix = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%@/%@"), directoryPath, fileName);
 160     else
 161     if (directoryPath)
 162         suffix = CFStringCreateCopy(kCFAllocatorDefault, directoryPath);
 163
 164     if (homeURL && suffix)
 165         fileURL = CFURLCreateCopyAppendingPathComponent(kCFAllocatorDefault, homeURL, suffix, false);
 166     CFReleaseSafe(suffix);
 167     CFReleaseSafe(homeURL);
 168     return fileURL;
 169 }
 170
 171 CFURLRef SecCopyURLForFileInKeychainDirectory(CFStringRef fileName)
 172 {
 173 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 174     // need to tack on uuid here
 175     Boolean isDirectory = (fileName == NULL);
 176     CFURLRef resultURL = NULL;
 177     CFStringRef resultStr = NULL;
 178     __block bool directoryExists = false;
 179
 180     CFURLRef keyChainBaseURL = SecCopyURLForFileInBaseDirectory(CFSTR("Library/Keychains"), NULL);
 181     CFStringRef uuid_path = copy_keychain_uuid_path(keyChainBaseURL);
 182     CFStringPerformWithCString(uuid_path, ^(const char *utf8Str) {
 183         directoryExists = keychain_verify_create_path(utf8Str);
 184     });
 185     require(directoryExists, done);
 186     if (fileName)
 187         resultStr = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%@/%@"), uuid_path, fileName);
 188     else
 189         resultStr = CFStringCreateCopy(kCFAllocatorDefault, uuid_path);
 190
 191 done:
 192     CFReleaseSafe(uuid_path);
 193     CFReleaseSafe(keyChainBaseURL);
 194     if (resultStr)
 195     {
 196         resultURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, resultStr, kCFURLPOSIXPathStyle, isDirectory);
 197         CFRelease(resultStr);
 198     }
 199     return resultURL;
 200 #else
 201     return SecCopyURLForFileInBaseDirectory(CFSTR("Library/Keychains"), fileName);
 202 #endif
 203 }
 204
 205 CFURLRef SecCopyURLForFileInUserCacheDirectory(CFStringRef fileName)
 206 {
 207 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 208     Boolean isDirectory = (fileName == NULL);
 209     CFURLRef resultURL = NULL;
 210     CFStringRef cacheDirStr = NULL;
 211     char strBuffer[PATH_MAX + 1];
 212     size_t result = confstr(_CS_DARWIN_USER_CACHE_DIR, strBuffer, sizeof(strBuffer));
 213     if (result == 0) {
 214         syslog(LOG_CRIT, "SecOCSPCacheCopyPath: confstr on _CS_DARWIN_USER_CACHE_DIR failed");
 215         return resultURL;
 216     }
 217     cacheDirStr = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%s/%@"), strBuffer, fileName);
 218     if (cacheDirStr) {
 219         resultURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, cacheDirStr, kCFURLPOSIXPathStyle, isDirectory);
 220     }
 221     CFReleaseSafe(cacheDirStr);
 222     return resultURL;
 223 #else
 224     return SecCopyURLForFileInBaseDirectory(CFSTR("Library/Caches"), fileName);
 225 #endif
 226 }
 227
 228 CFURLRef SecCopyURLForFileInPreferencesDirectory(CFStringRef fileName)
 229 {
 230     return SecCopyURLForFileInBaseDirectory(CFSTR("Library/Preferences"), fileName);
 231 }
 232
 233 CFURLRef SecCopyURLForFileInManagedPreferencesDirectory(CFStringRef fileName)
 234 {
 235     CFURLRef resultURL = NULL;
 236
 237     CFStringRef userName;
 238 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
 239     userName = CFCopyUserName();
 240 #else
 241     userName = CFStringCreateWithCString(kCFAllocatorDefault, "mobile", kCFStringEncodingASCII);
 242 #endif
 243
 244     if (userName) {
 245         CFStringRef path = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("/Library/Managed Preferences/%@/%@"), userName, fileName);
 246         if (path) {
 247             resultURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, path, kCFURLPOSIXPathStyle, false);
 248             CFReleaseSafe(path);
 249         }
 250         CFReleaseSafe(userName);
 251     }
 252
 253     return resultURL;
 254 }
 255
 256 void WithPathInKeychainDirectory(CFStringRef fileName, void(^operation)(const char *utf8String))
 257 {
 258     CFURLRef fileURL = SecCopyURLForFileInKeychainDirectory(fileName);
 259     if (fileURL) {
 260         UInt8 buffer[MAXPATHLEN];
 261         CFURLGetFileSystemRepresentation(fileURL, false, buffer, sizeof(buffer));
 262
 263         operation((const char*)buffer);
 264         CFRelease(fileURL);
 265     }
 266 }
 267
 268 void SetCustomHomeURLString(CFStringRef home_path)
 269 {
 270     CFReleaseNull(sCustomHomeURL);
 271     if (home_path) {
 272         sCustomHomeURL = CFURLCreateWithFileSystemPath(NULL, home_path, kCFURLPOSIXPathStyle, true);
 273     }
 274 }
 275
 276 void SetCustomHomeURL(const char* path)
 277 {
 278     if (path) {
 279         CFStringRef path_cf = CFStringCreateWithCStringNoCopy(NULL, path, kCFStringEncodingUTF8, kCFAllocatorNull);
 280         SetCustomHomeURLString(path_cf);
 281         CFReleaseSafe(path_cf);
 282     } else {
 283         SetCustomHomeURLString(NULL);
 284     }
 285 }
 286
 287