mDNSMacOSX/PreferencePane/ConfigurationAuthority.c

   1 /*
   2     File: ConfigurationAuthority.c
   3
   4     Abstract: Interface to system security framework that manages access
   5     to protected resources like system configuration preferences.
   6
   7     Copyright: (c) Copyright 2005 Apple Computer, Inc. All rights reserved.
   8
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  44     Change History (most recent first):
  45
  46 $Log: ConfigurationAuthority.c,v $
  47 Revision 1.2  2005/08/07 22:48:05  mkrochma
  48 <rdar://problem/4204003> Bonjour Pref Pane returns -927 when "system.preferences" is not shared
  49
  50 Revision 1.1  2005/02/05 02:28:22  cheshire
  51 Add Preference Pane to facilitate testing of DDNS & wide-area features
  52
  53 */
  54
  55 #include "ConfigurationAuthority.h"
  56 #include "ConfigurationRights.h"
  57
  58 #include <AssertMacros.h>
  59
  60
  61 static AuthorizationRef gAuthRef = 0;
  62
  63 static AuthorizationItem        gAuthorizations[] = {   { UPDATE_SC_RIGHT, 0, NULL, 0 },
  64                                                                                                         { EDIT_SYS_KEYCHAIN_RIGHT, 0, NULL, 0 }};
  65 static AuthorizationRights      gAuthSet = { sizeof gAuthorizations / sizeof gAuthorizations[0], gAuthorizations };
  66
  67 static CFDictionaryRef  CreateRightsDict( CFStringRef prompt)
  68 /* Create a CFDictionary decribing an auth right. See /etc/authorization for examples. */
  69 /* Specifies that the right requires admin authentication, which persists for 5 minutes. */
  70 {
  71         CFMutableDictionaryRef  dict = NULL, tmpDict;
  72         CFMutableArrayRef               mechanisms;
  73         CFNumberRef                             timeout;
  74         int                                             val;
  75
  76         tmpDict = CFDictionaryCreateMutable( (CFAllocatorRef) NULL, 0, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
  77         require( tmpDict != NULL, MakeDictFailed);
  78
  79         CFDictionaryAddValue(tmpDict, CFSTR("class"), CFSTR("user"));
  80         CFDictionaryAddValue(tmpDict, CFSTR("comment"), prompt);
  81         CFDictionaryAddValue(tmpDict, CFSTR("group"), CFSTR("admin"));
  82
  83         mechanisms = CFArrayCreateMutable((CFAllocatorRef) NULL, 1, &kCFTypeArrayCallBacks);
  84         require( mechanisms != NULL, MakeArrayFailed);
  85         CFArrayAppendValue( mechanisms, CFSTR("builtin:authenticate"));
  86         CFDictionaryAddValue( tmpDict, CFSTR("mechanisms"), mechanisms);
  87
  88         val = 300;      // seconds
  89         timeout = CFNumberCreate((CFAllocatorRef) NULL, kCFNumberIntType, &val);
  90         require( timeout != NULL, MakeIntFailed);
  91         CFDictionaryAddValue( tmpDict, CFSTR("timeout"), timeout);
  92         CFDictionaryAddValue( tmpDict, CFSTR("shared"), kCFBooleanTrue);
  93
  94         dict = tmpDict;
  95         tmpDict = NULL;
  96
  97         CFRelease( timeout);
  98 MakeIntFailed:
  99         CFRelease( mechanisms);
 100 MakeArrayFailed:
 101         if ( tmpDict)
 102                 CFRelease( tmpDict);
 103 MakeDictFailed:
 104         return dict;
 105 }
 106
 107 OSStatus InitConfigAuthority(void)
 108 /* Initialize the authorization record-keeping */
 109 {
 110         OSStatus        err;
 111         CFDictionaryRef dict;
 112         CFStringRef             rightInfo;
 113
 114         err = AuthorizationCreate((AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 115                                                                 (AuthorizationFlags) 0, &gAuthRef);
 116         require_noerr( err, NewAuthFailed);
 117
 118         err = AuthorizationRightGet( UPDATE_SC_RIGHT, (CFDictionaryRef*) NULL);
 119         if( err == errAuthorizationDenied)
 120         {
 121                 rightInfo = CFCopyLocalizedString(CFSTR("Authentication required to set Dynamic DNS preferences."),
 122                                                 CFSTR("Describes operation that requires user authorization"));
 123                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 124                 dict = CreateRightsDict(rightInfo);
 125                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 126
 127                 err = AuthorizationRightSet(gAuthRef, UPDATE_SC_RIGHT, dict, (CFStringRef) NULL,
 128                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 129                 CFRelease(rightInfo);
 130                 CFRelease(dict);
 131         }
 132         require_noerr( err, AuthSetFailed);
 133
 134         err = AuthorizationRightGet( EDIT_SYS_KEYCHAIN_RIGHT, (CFDictionaryRef*) NULL);
 135         if( err == errAuthorizationDenied)
 136         {
 137                 rightInfo = CFCopyLocalizedString( CFSTR("Authentication required to edit System Keychain."),
 138                                                 CFSTR("Describes operation that requires user authorization"));
 139                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 140                 dict = CreateRightsDict( rightInfo);
 141                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 142
 143                 err = AuthorizationRightSet(gAuthRef, EDIT_SYS_KEYCHAIN_RIGHT, dict, (CFStringRef) NULL,
 144                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 145                 CFRelease( rightInfo);
 146                 CFRelease( dict);
 147         }
 148         require_noerr( err, AuthSetFailed);
 149
 150 AuthSetFailed:
 151 GetStrFailed:
 152 NewAuthFailed:
 153         return err;
 154 }
 155
 156 OSStatus        AttemptAcquireAuthority( Boolean allowUI)
 157 /* Try to get permission for privileged ops, either implicitly or by asking the user for */
 158 /* authority to perform operations (if necessary) */
 159 {
 160         AuthorizationFlags      allowFlag = allowUI ? kAuthorizationFlagInteractionAllowed : 0;
 161         OSStatus                        err;
 162
 163         err = AuthorizationCopyRights( gAuthRef, &gAuthSet, (AuthorizationEnvironment*) NULL,
 164                                                                         kAuthorizationFlagExtendRights | kAuthorizationFlagPreAuthorize |
 165                                                                         allowFlag,
 166                                                                         (AuthorizationRights**) NULL);
 167         return err;
 168 }
 169
 170 OSStatus ReleaseAuthority(void)
 171 /* Discard authority to perform operations */
 172 {
 173         (void) AuthorizationFree( gAuthRef, kAuthorizationFlagDestroyRights);
 174         gAuthRef = 0;
 175         return AuthorizationCreate( (AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 176                                                                 (AuthorizationFlags) 0, &gAuthRef);
 177 }
 178
 179 Boolean CurrentlyAuthorized(void)
 180 {
 181         OSStatus err = AttemptAcquireAuthority(true);
 182         return err == noErr;
 183 }
 184
 185
 186 OSStatus ExternalizeAuthority(AuthorizationExternalForm *pAuth)
 187 /* Package up current authorizations for transfer to another process */
 188 {
 189         return AuthorizationMakeExternalForm(gAuthRef, pAuth);
 190 }