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
   9     Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
  10     ("Apple") in consideration of your agreement to the following terms, and your
  11     use, installation, modification or redistribution of this Apple software
  12     constitutes acceptance of these terms.  If you do not agree with these terms,
  13     please do not use, install, modify or redistribute this Apple software.
  14
  15     In consideration of your agreement to abide by the following terms, and subject
  16     to these terms, Apple grants you a personal, non-exclusive license, under Apple's
  17     copyrights in this original Apple software (the "Apple Software"), to use,
  18     reproduce, modify and redistribute the Apple Software, with or without
  19     modifications, in source and/or binary forms; provided that if you redistribute
  20     the Apple Software in its entirety and without modifications, you must retain
  21     this notice and the following text and disclaimers in all such redistributions of
  22     the Apple Software.  Neither the name, trademarks, service marks or logos of
  23     Apple Computer, Inc. may be used to endorse or promote products derived from the
  24     Apple Software without specific prior written permission from Apple.  Except as
  25     expressly stated in this notice, no other rights or licenses, express or implied,
  26     are granted by Apple herein, including but not limited to any patent rights that
  27     may be infringed by your derivative works or by other works in which the Apple
  28     Software may be incorporated.
  29
  30     The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
  31     WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
  32     WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  33     PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
  34     COMBINATION WITH YOUR PRODUCTS.
  35
  36     IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
  37     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  38     GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39     ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
  40     OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
  41     (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
  42     ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  43  */
  44
  45 #include "ConfigurationAuthority.h"
  46 #include "ConfigurationRights.h"
  47
  48 #include <AssertMacros.h>
  49
  50
  51 static AuthorizationRef gAuthRef = 0;
  52
  53 static AuthorizationItem        gAuthorizations[] = {   { UPDATE_SC_RIGHT, 0, NULL, 0 },
  54                                                                                                         { EDIT_SYS_KEYCHAIN_RIGHT, 0, NULL, 0 }};
  55 static AuthorizationRights      gAuthSet = { sizeof gAuthorizations / sizeof gAuthorizations[0], gAuthorizations };
  56
  57 static CFDictionaryRef  CreateRightsDict( CFStringRef prompt)
  58 /* Create a CFDictionary decribing an auth right. See /etc/authorization for examples. */
  59 /* Specifies that the right requires admin authentication, which persists for 5 minutes. */
  60 {
  61         CFMutableDictionaryRef  dict = NULL, tmpDict;
  62         CFMutableArrayRef               mechanisms;
  63         CFNumberRef                             timeout;
  64         int                                             val;
  65
  66         tmpDict = CFDictionaryCreateMutable( (CFAllocatorRef) NULL, 0, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
  67         require( tmpDict != NULL, MakeDictFailed);
  68
  69         CFDictionaryAddValue(tmpDict, CFSTR("class"), CFSTR("user"));
  70         CFDictionaryAddValue(tmpDict, CFSTR("comment"), prompt);
  71         CFDictionaryAddValue(tmpDict, CFSTR("group"), CFSTR("admin"));
  72
  73         mechanisms = CFArrayCreateMutable((CFAllocatorRef) NULL, 1, &kCFTypeArrayCallBacks);
  74         require( mechanisms != NULL, MakeArrayFailed);
  75         CFArrayAppendValue( mechanisms, CFSTR("builtin:authenticate"));
  76         CFDictionaryAddValue( tmpDict, CFSTR("mechanisms"), mechanisms);
  77
  78         val = 300;      // seconds
  79         timeout = CFNumberCreate((CFAllocatorRef) NULL, kCFNumberIntType, &val);
  80         require( timeout != NULL, MakeIntFailed);
  81         CFDictionaryAddValue( tmpDict, CFSTR("timeout"), timeout);
  82         CFDictionaryAddValue( tmpDict, CFSTR("shared"), kCFBooleanTrue);
  83
  84         dict = tmpDict;
  85         tmpDict = NULL;
  86
  87         CFRelease( timeout);
  88 MakeIntFailed:
  89         CFRelease( mechanisms);
  90 MakeArrayFailed:
  91         if ( tmpDict)
  92                 CFRelease( tmpDict);
  93 MakeDictFailed:
  94         return dict;
  95 }
  96
  97 OSStatus InitConfigAuthority(void)
  98 /* Initialize the authorization record-keeping */
  99 {
 100         OSStatus        err;
 101         CFDictionaryRef dict;
 102         CFStringRef             rightInfo;
 103
 104         err = AuthorizationCreate((AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 105                                                                 (AuthorizationFlags) 0, &gAuthRef);
 106         require_noerr( err, NewAuthFailed);
 107
 108         err = AuthorizationRightGet( UPDATE_SC_RIGHT, (CFDictionaryRef*) NULL);
 109         if (err == errAuthorizationDenied)
 110         {
 111                 rightInfo = CFCopyLocalizedString(CFSTR("Authentication required to set Dynamic DNS preferences."),
 112                                                 CFSTR("Describes operation that requires user authorization"));
 113                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 114                 dict = CreateRightsDict(rightInfo);
 115                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 116
 117                 err = AuthorizationRightSet(gAuthRef, UPDATE_SC_RIGHT, dict, (CFStringRef) NULL,
 118                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 119                 CFRelease(rightInfo);
 120                 CFRelease(dict);
 121         }
 122         require_noerr( err, AuthSetFailed);
 123
 124         err = AuthorizationRightGet( EDIT_SYS_KEYCHAIN_RIGHT, (CFDictionaryRef*) NULL);
 125         if (err == errAuthorizationDenied)
 126         {
 127                 rightInfo = CFCopyLocalizedString( CFSTR("Authentication required to edit System Keychain."),
 128                                                 CFSTR("Describes operation that requires user authorization"));
 129                 require_action( rightInfo != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 130                 dict = CreateRightsDict( rightInfo);
 131                 require_action( dict != NULL, GetStrFailed, err=coreFoundationUnknownErr;);
 132
 133                 err = AuthorizationRightSet(gAuthRef, EDIT_SYS_KEYCHAIN_RIGHT, dict, (CFStringRef) NULL,
 134                                                                         (CFBundleRef) NULL, (CFStringRef) NULL);
 135                 CFRelease( rightInfo);
 136                 CFRelease( dict);
 137         }
 138         require_noerr( err, AuthSetFailed);
 139
 140 AuthSetFailed:
 141 GetStrFailed:
 142 NewAuthFailed:
 143         return err;
 144 }
 145
 146 OSStatus        AttemptAcquireAuthority( Boolean allowUI)
 147 /* Try to get permission for privileged ops, either implicitly or by asking the user for */
 148 /* authority to perform operations (if necessary) */
 149 {
 150         AuthorizationFlags      allowFlag = allowUI ? kAuthorizationFlagInteractionAllowed : 0;
 151         OSStatus                        err;
 152
 153         err = AuthorizationCopyRights( gAuthRef, &gAuthSet, (AuthorizationEnvironment*) NULL,
 154                                                                         kAuthorizationFlagExtendRights | kAuthorizationFlagPreAuthorize |
 155                                                                         allowFlag,
 156                                                                         (AuthorizationRights**) NULL);
 157         return err;
 158 }
 159
 160 OSStatus ReleaseAuthority(void)
 161 /* Discard authority to perform operations */
 162 {
 163         (void) AuthorizationFree( gAuthRef, kAuthorizationFlagDefaults);
 164         gAuthRef = 0;
 165         return AuthorizationCreate( (AuthorizationRights*) NULL, (AuthorizationEnvironment*) NULL,
 166                                                                 (AuthorizationFlags) 0, &gAuthRef);
 167 }
 168
 169 Boolean CurrentlyAuthorized(void)
 170 {
 171         OSStatus err = AttemptAcquireAuthority(true);
 172         return err == noErr;
 173 }
 174
 175
 176 OSStatus ExternalizeAuthority(AuthorizationExternalForm *pAuth)
 177 /* Package up current authorizations for transfer to another process */
 178 {
 179         return AuthorizationMakeExternalForm(gAuthRef, pAuth);
 180 }