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 1.1  2005/02/05 02:28:22  cheshire
  48 Add Preference Pane to facilitate testing of DDNS & wide-area features
  49
  50 */
  51
  52 #include "ConfigurationAuthority.h"
  53 #include "ConfigurationRights.h"
  54
  55 #include <AssertMacros.h>
  56
  57
  58 static AuthorizationRef gAuthRef = 0;
  59
  60 static AuthorizationItem        gAuthorizations[] = {   { UPDATE_SC_RIGHT, 0, NULL, 0 },
  61                                                                                                         { EDIT_SYS_KEYCHAIN_RIGHT, 0, NULL, 0 }};
  62 static AuthorizationRights      gAuthSet = { sizeof gAuthorizations / sizeof gAuthorizations[0], gAuthorizations };
  63
  64 static CFDictionaryRef  CreateRightsDict( CFStringRef prompt)
  65 /* Create a CFDictionary decribing an auth right. See /etc/authorization for examples. */
  66 /* Specifies that the right requires admin authentication, which persists for 5 minutes. */
  67 {
  68         CFMutableDictionaryRef  dict = NULL, tmpDict;
  69         CFMutableArrayRef               mechanisms;
  70         CFNumberRef                             timeout;
  71         int                                             val;
  72
  73         tmpDict = CFDictionaryCreateMutable( (CFAllocatorRef) NULL, 0, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
  74         require( tmpDict != NULL, MakeDictFailed);
  75
  76         CFDictionaryAddValue(tmpDict, CFSTR("class"), CFSTR("user"));
  77         CFDictionaryAddValue(tmpDict, CFSTR("comment"), prompt);
  78         CFDictionaryAddValue(tmpDict, CFSTR("group"), CFSTR("admin"));
  79
  80         mechanisms = CFArrayCreateMutable((CFAllocatorRef) NULL, 1, &kCFTypeArrayCallBacks);
  81         require( mechanisms != NULL, MakeArrayFailed);
  82         CFArrayAppendValue( mechanisms, CFSTR("builtin:authenticate"));
  83         CFDictionaryAddValue( tmpDict, CFSTR("mechanisms"), mechanisms);
  84
  85         val = 300;      // seconds
  86         timeout = CFNumberCreate((CFAllocatorRef) NULL, kCFNumberIntType, &val);
  87         require( timeout != NULL, MakeIntFailed);
  88         CFDictionaryAddValue( tmpDict, CFSTR("timeout"), timeout);
  89         CFDictionaryAddValue( tmpDict, CFSTR("shared"), kCFBooleanTrue);
  90
  91         dict = tmpDict;
  92         tmpDict = NULL;
  93
  94         CFRelease( timeout);
  95 MakeIntFailed:
  96         CFRelease( mechanisms);
  97 MakeArrayFailed:
  98         if ( tmpDict)
  99                 CFRelease( tmpDict);
 100 MakeDictFailed:
 101         return dict;
 102 }
 103
 104 OSStatus InitConfigAuthority(void)
 105 /* Initialize the authorization record-keeping */
 106 {
 107         OSStatus        err;
 108         CFDictionaryRef dict;
 109         CFStringRef             rightInfo;
 110
 111         err = AuthorizationCreate((AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 112                                                                 (AuthorizationFlags) 0, &gAuthRef);
 113         require_noerr( err, NewAuthFailed);
 114
 115         err = AuthorizationRightGet( UPDATE_SC_RIGHT, (CFDictionaryRef*) NULL);
 116         if( err == errAuthorizationDenied)
 117         {
 118                 rightInfo = CFCopyLocalizedString(CFSTR("Authentication required to set Dynamic DNS preferences."),
 119                                                 CFSTR("Describes operation that requires user authorization"));
 120                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 121                 dict = CreateRightsDict(rightInfo);
 122                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 123
 124                 err = AuthorizationRightSet(gAuthRef, UPDATE_SC_RIGHT, dict, (CFStringRef) NULL,
 125                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 126                 CFRelease(rightInfo);
 127                 CFRelease(dict);
 128         }
 129         require_noerr( err, AuthSetFailed);
 130
 131         err = AuthorizationRightGet( EDIT_SYS_KEYCHAIN_RIGHT, (CFDictionaryRef*) NULL);
 132         if( err == errAuthorizationDenied)
 133         {
 134                 rightInfo = CFCopyLocalizedString( CFSTR("Authentication required to edit System Keychain."),
 135                                                 CFSTR("Describes operation that requires user authorization"));
 136                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 137                 dict = CreateRightsDict( rightInfo);
 138                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 139
 140                 err = AuthorizationRightSet(gAuthRef, EDIT_SYS_KEYCHAIN_RIGHT, dict, (CFStringRef) NULL,
 141                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 142                 CFRelease( rightInfo);
 143                 CFRelease( dict);
 144         }
 145         require_noerr( err, AuthSetFailed);
 146
 147         (void) AttemptAcquireAuthority( false);
 148
 149 AuthSetFailed:
 150 GetStrFailed:
 151 NewAuthFailed:
 152         return err;
 153 }
 154
 155 OSStatus        AttemptAcquireAuthority( Boolean allowUI)
 156 /* Try to get permission for privileged ops, either implicitly or by asking the user for */
 157 /* authority to perform operations (if necessary) */
 158 {
 159         AuthorizationFlags      allowFlag = allowUI ? kAuthorizationFlagInteractionAllowed : 0;
 160         OSStatus                        err;
 161
 162         err = AuthorizationCopyRights( gAuthRef, &gAuthSet, (AuthorizationEnvironment*) NULL,
 163                                                                         kAuthorizationFlagExtendRights | kAuthorizationFlagPreAuthorize |
 164                                                                         allowFlag,
 165                                                                         (AuthorizationRights**) NULL);
 166         return err;
 167 }
 168
 169 OSStatus ReleaseAuthority(void)
 170 /* Discard authority to perform operations */
 171 {
 172         (void) AuthorizationFree( gAuthRef, kAuthorizationFlagDestroyRights);
 173         gAuthRef = 0;
 174         return AuthorizationCreate( (AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 175                                                                 (AuthorizationFlags) 0, &gAuthRef);
 176 }
 177
 178 Boolean CurrentlyAuthorized(void)
 179 {
 180         OSStatus err;
 181
 182         err = AuthorizationCopyRights(gAuthRef, &gAuthSet, (AuthorizationEnvironment*) NULL,
 183                                                                         (AuthorizationFlags) 0, (AuthorizationRights**) NULL);
 184
 185         return err == noErr;
 186 }
 187
 188
 189 OSStatus ExternalizeAuthority(AuthorizationExternalForm *pAuth)
 190 /* Package up current authorizations for transfer to another process */
 191 {
 192         return AuthorizationMakeExternalForm(gAuthRef, pAuth);
 193 }