OSX/libsecurity_mds/lib/MDSPrefs.cpp

   1 /*
   2  * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 //
  20 // MDSPrefs.cpp
  21 //
  22
  23 #include "MDSPrefs.h"
  24 #include <CoreFoundation/CFPreferences.h>
  25 #include <stdlib.h>
  26
  27 // Construct the preferences object and read the current preference settings.
  28
  29 MDSPrefs::MDSPrefs()
  30     :   mPluginFolders(NULL)
  31 {
  32     if (!readPathFromPrefs() && !readPathFromEnv())
  33         useDefaultPath();
  34 }
  35
  36 // Destroy the preferences object.
  37
  38 MDSPrefs::~MDSPrefs()
  39 {
  40     if (mPluginFolders)
  41         CFRelease(mPluginFolders);
  42 }
  43
  44 // Obtain the plugin path from a preferences file. Returns true on success of false
  45 // if no prefs could be found.
  46
  47 bool
  48 MDSPrefs::readPathFromPrefs()
  49 {
  50     static const CFStringRef kPrefsSuite = CFSTR("com.apple.mds");
  51     static const CFStringRef kPluginPathKey = CFSTR("securityPluginPath");
  52
  53     bool result = true;
  54
  55     CFPreferencesAddSuitePreferencesToApp(kCFPreferencesCurrentApplication, kPrefsSuite);
  56
  57     CFPropertyListRef value;
  58     value = CFPreferencesCopyAppValue(kPluginPathKey, kCFPreferencesCurrentApplication);
  59
  60     if (CFGetTypeID(value) != CFArrayGetTypeID())
  61                 // the prefs object is not an array, so fail
  62                 result = false;
  63
  64         else {
  65         // make sure that all array elements are strings
  66
  67                 CFArrayRef array = (CFArrayRef) value;
  68                 int numItems = CFArrayGetCount(array);
  69                 for (int i = 0; i < numItems; i++)
  70                         if (CFGetTypeID(CFArrayGetValueAtIndex(array, i)) != CFStringGetTypeID()) {
  71                                 result = false;
  72                                 break;
  73                         }
  74         }
  75
  76         if (result)
  77         mPluginFolders = (CFArrayRef) value;
  78         else
  79         CFRelease(value);
  80
  81     return result;
  82 }
  83
  84 bool
  85 MDSPrefs::readPathFromEnv()
  86 {
  87     static const char *kPluginPathEnv = "MDSPATH";
  88     static const CFStringRef kSeparator = CFSTR(":");
  89
  90     char *envValue = getenv(kPluginPathEnv);
  91     if (envValue) {
  92         CFStringRef path = CFStringCreateWithCString(NULL, envValue, kCFStringEncodingUTF8);
  93
  94         mPluginFolders = CFStringCreateArrayBySeparatingStrings(NULL, path, kSeparator);
  95
  96         CFRelease(path);
  97         return true;
  98     }
  99
 100     return false;
 101 }
 102
 103 void
 104 MDSPrefs::useDefaultPath()
 105 {
 106     static const CFStringRef kDefaultPluginPath = CFSTR("/System/Library/Security");
 107
 108     mPluginFolders = CFArrayCreate(NULL, (const void **) &kDefaultPluginPath, 1, &kCFTypeArrayCallBacks);
 109 }
 110
 111 // Retrieve the elements of the plugin path.
 112
 113 int
 114 MDSPrefs::getNumberOfPluginFolders() const
 115 {
 116     if (mPluginFolders)
 117         return CFArrayGetCount(mPluginFolders);
 118
 119     return 0;
 120 }
 121
 122 const char *
 123 MDSPrefs::getPluginFolder(int index)
 124 {
 125     if (mPluginFolders) {
 126         int numValues = CFArrayGetCount(mPluginFolders);
 127         if (index >= 0 && index < numValues) {
 128             CFStringRef value = (CFStringRef) CFArrayGetValueAtIndex(mPluginFolders, index);
 129             if (value) {
 130                 // we have to copy the string since it may be using a different native
 131                 // encoding than the one we want. the copy is put in a temporary buffer,
 132                 // so its lifetime is limited to the next call to getPluginFolder() or to
 133                 // the destruction of the MDSPrefs object. Very long paths will silently fail.
 134
 135                 if (CFStringGetCString(value, mTempBuffer, kTempBufferSize, kCFStringEncodingUTF8))
 136                     return mTempBuffer;
 137             }
 138         }
 139     }
 140
 141     return NULL;
 142 }
 143