OSX/sec/ProjectHeaders/Security/SecureObjectSync/SOSPeerInfoCollections.c

   1 /*
   2  * Copyright (c) 2013-2014 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 #include <Security/SecureObjectSync/SOSPeerInfoCollections.h>
  26
  27 #include <CoreFoundation/CoreFoundation.h>
  28 #include <utilities/SecCFWrappers.h>
  29 #include <utilities/SecCFError.h>
  30 #include <utilities/SecXPCError.h>
  31 #include <corecrypto/ccder.h>
  32 #include <Security/SecureObjectSync/SOSInternal.h>
  33 #include <AssertMacros.h>
  34 #include <SOSPeerInfoDER.h>
  35
  36 //
  37 // PeerInfoSetby ID handling
  38 //
  39
  40 //
  41 //
  42 // CFSetRetainCallback
  43 //
  44
  45 static CFStringRef GetIDOrString(const void *object) {
  46     return isSOSPeerInfo(object) ?
  47             SOSPeerInfoGetPeerID((SOSPeerInfoRef)object) :
  48             (isString(object) ? (CFStringRef) object : NULL);
  49 }
  50
  51 static Boolean          SOSPeerInfoIDEqual(const void *value1, const void *value2)
  52 {
  53     return CFEqualSafe(GetIDOrString(value1), GetIDOrString(value2));
  54 }
  55
  56 static CFHashCode       SOSPeerInfoIDHash(const void *value)
  57 {
  58     return CFHash(GetIDOrString(value));
  59 }
  60
  61 bool SOSPeerInfoSetContainsIdenticalPeers(CFSetRef set1, CFSetRef set2){
  62
  63     __block bool result = true;
  64
  65     if(!CFEqualSafe(set1, set2))
  66         return false;
  67
  68     CFSetForEach(set1, ^(const void *value) {
  69         SOSPeerInfoRef peer1 = (SOSPeerInfoRef)value;
  70         SOSPeerInfoRef peer2 = (SOSPeerInfoRef)CFSetGetValue(set2, peer1);
  71         result &= CFEqualSafe(peer1, peer2);
  72     });
  73     return result;
  74 }
  75 const CFSetCallBacks kSOSPeerSetCallbacks = {0, SecCFRetainForCollection, SecCFReleaseForCollection, CFCopyDescription, SOSPeerInfoIDEqual, SOSPeerInfoIDHash};
  76
  77 CFMutableSetRef CFSetCreateMutableForSOSPeerInfosByID(CFAllocatorRef allocator)
  78 {
  79     return CFSetCreateMutable(allocator, 0, &kSOSPeerSetCallbacks);
  80 }
  81
  82 SOSPeerInfoRef SOSPeerInfoSetFindByID(CFSetRef set, CFStringRef id) {
  83     return (SOSPeerInfoRef) CFSetGetValue(set, id);
  84 }
  85
  86 //
  87 // CFArray of Peer Info handling
  88 //
  89
  90 void CFArrayOfSOSPeerInfosSortByID(CFMutableArrayRef peerInfoArray)
  91 {
  92     CFArraySortValues(peerInfoArray, CFRangeMake(0, CFArrayGetCount(peerInfoArray)), SOSPeerInfoCompareByID, NULL);
  93 }
  94
  95
  96 //
  97 // PeerInfoArray encoding decoding
  98 //
  99
 100 CFMutableArrayRef SOSPeerInfoArrayCreateFromDER(CFAllocatorRef allocator, CFErrorRef* error,
 101                                                 const uint8_t** der_p, const uint8_t *der_end) {
 102     CFMutableArrayRef pia = CFArrayCreateMutableForCFTypes(allocator);
 103
 104     const uint8_t *sequence_end;
 105
 106     *der_p = ccder_decode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, &sequence_end, *der_p, der_end);
 107
 108     require_action(*der_p, fail, SOSCreateError(kSOSErrorBadFormat, CFSTR("Bad Peer Info Array Sequence Header"), NULL, error));
 109
 110     while (sequence_end != *der_p) {
 111         SOSPeerInfoRef pi = SOSPeerInfoCreateFromDER(allocator, error, der_p, sequence_end);
 112
 113         if (pi == NULL || *der_p == NULL) {
 114             SOSCreateError(kSOSErrorBadFormat, CFSTR("Bad Peer Info Array DER"), (error != NULL ? *error : NULL), error);
 115             CFReleaseNull(pi);
 116             goto fail;
 117         }
 118
 119         CFArrayAppendValue(pia, pi);
 120         CFReleaseSafe(pi);
 121     }
 122
 123     if (!pia)
 124         *der_p = NULL;
 125     return pia;
 126
 127 fail:
 128     CFReleaseNull(pia);
 129     *der_p = NULL;
 130     return NULL;
 131 }
 132
 133 size_t SOSPeerInfoArrayGetDEREncodedSize(CFArrayRef pia, CFErrorRef *error) {
 134     __block size_t array_size = 0;
 135     __block bool fail = false;
 136
 137     CFArrayForEach(pia, ^(const void *value) {
 138         if (isSOSPeerInfo(value)) {
 139             SOSPeerInfoRef pi = (SOSPeerInfoRef) value;
 140             size_t pi_size = SOSPeerInfoGetDEREncodedSize(pi, error);
 141
 142             fail = (pi_size == 0);
 143             array_size += pi_size;
 144         } else {
 145             SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Non SOSPeerInfo in array"), (error != NULL ? *error : NULL), error);
 146             fail = true;
 147         }
 148     });
 149
 150     return fail ? 0 : ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE, array_size);
 151 }
 152
 153 uint8_t* SOSPeerInfoArrayEncodeToDER(CFArrayRef pia, CFErrorRef* error, const uint8_t* der, uint8_t* der_end_param) {
 154
 155     uint8_t* const sequence_end = der_end_param;
 156     __block uint8_t* der_end = der_end_param;
 157
 158     CFArrayForEachReverse(pia, ^(const void *value) {
 159         SOSPeerInfoRef pi = (SOSPeerInfoRef) value;
 160         if (CFGetTypeID(pi) != SOSPeerInfoGetTypeID()) {
 161             SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Non SOSPeerInfo in array"), NULL, error);
 162             der_end = NULL; // Indicate error and continue.
 163         }
 164         if (der_end)
 165             der_end = SOSPeerInfoEncodeToDER(pi, error, der, der_end);
 166     });
 167
 168     if (der_end == NULL)
 169         return NULL;
 170
 171     return ccder_encode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, sequence_end, der, der_end);
 172 }
 173
 174
 175 CFMutableSetRef SOSPeerInfoSetCreateFromArrayDER(CFAllocatorRef allocator, const CFSetCallBacks *callbacks, CFErrorRef* error,
 176                                                  const uint8_t** der_p, const uint8_t *der_end) {
 177     CFMutableSetRef result = NULL;
 178
 179     CFArrayRef peers = SOSPeerInfoArrayCreateFromDER(allocator, error, der_p, der_end);
 180
 181     if (peers) {
 182         result = CFSetCreateMutable(allocator, 0, callbacks);
 183         CFSetSetValues(result, peers);
 184     }
 185
 186     CFReleaseNull(peers);
 187     return result;
 188 }
 189
 190 size_t SOSPeerInfoSetGetDEREncodedArraySize(CFSetRef pia, CFErrorRef *error) {
 191     __block size_t array_size = 0;
 192     __block bool fail = false;
 193
 194     CFSetForEach(pia, ^(const void *value) {
 195         if (isSOSPeerInfo(value)) {
 196             SOSPeerInfoRef pi = (SOSPeerInfoRef) value;
 197             size_t pi_size = SOSPeerInfoGetDEREncodedSize(pi, error);
 198
 199             fail = (pi_size == 0);
 200             array_size += pi_size;
 201         } else {
 202             SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Non SOSPeerInfo in array"), (error != NULL ? *error : NULL), error);
 203             fail = true;
 204         }
 205     });
 206
 207     return fail ? 0 : ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE, array_size);
 208 }
 209
 210 uint8_t* SOSPeerInfoSetEncodeToArrayDER(CFSetRef pis, CFErrorRef* error, const uint8_t* der, uint8_t* der_end) {
 211     CFMutableArrayRef pia = CFSetCopyValues(pis);
 212
 213     CFArrayOfSOSPeerInfosSortByID(pia);
 214
 215     uint8_t* result = SOSPeerInfoArrayEncodeToDER(pia, error, der, der_end);
 216
 217     CFReleaseNull(pia);
 218
 219     return result;
 220 }
 221
 222
 223
 224 CFArrayRef CreateArrayOfPeerInfoWithXPCObject(xpc_object_t peerArray, CFErrorRef* error) {
 225     if (!peerArray) {
 226         SecCFCreateErrorWithFormat(kSecXPCErrorUnexpectedNull, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("Unexpected Null Array to encode"));
 227         return NULL;
 228     }
 229
 230     if (xpc_get_type(peerArray) != XPC_TYPE_DATA) {
 231         SecCFCreateErrorWithFormat(kSecXPCErrorUnexpectedType, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("Array of peer info not array, got %@"), peerArray);
 232         return NULL;
 233     }
 234
 235     const uint8_t* der = xpc_data_get_bytes_ptr(peerArray);
 236     const uint8_t* der_end = der + xpc_data_get_length(peerArray);
 237
 238     return SOSPeerInfoArrayCreateFromDER(kCFAllocatorDefault, error, &der, der_end);
 239 }
 240
 241 xpc_object_t CreateXPCObjectWithArrayOfPeerInfo(CFArrayRef array, CFErrorRef *error) {
 242     size_t data_size = SOSPeerInfoArrayGetDEREncodedSize(array, error);
 243     if (data_size == 0)
 244         return NULL;
 245     uint8_t *data = (uint8_t *)malloc(data_size);
 246     if (!data) return NULL;
 247
 248     xpc_object_t result = NULL;
 249     if (SOSPeerInfoArrayEncodeToDER(array, error, data, data + data_size))
 250         result = xpc_data_create(data, data_size);
 251
 252     free(data);
 253     return result;
 254 }