OSX/utilities/der_set.c

   1 /*
   2  * Copyright (c) 2015 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 <stdio.h>
  26 #include "der_set.h"
  27
  28 #include "utilities/SecCFRelease.h"
  29 #include "utilities/der_plist.h"
  30 #include "utilities/der_plist_internal.h"
  31 #include "utilities/SecCFWrappers.h"
  32
  33 #include <corecrypto/ccder.h>
  34 #include <CoreFoundation/CoreFoundation.h>
  35
  36 const uint8_t* der_decode_set(CFAllocatorRef allocator, CFOptionFlags mutability,
  37                                      CFSetRef* set, CFErrorRef *error,
  38                                      const uint8_t* der, const uint8_t *der_end)
  39 {
  40     if (NULL == der)
  41         return NULL;
  42
  43     const uint8_t *payload_end = 0;
  44     const uint8_t *payload = ccder_decode_constructed_tl(CCDER_CONSTRUCTED_CFSET, &payload_end, der, der_end);
  45
  46     if (NULL == payload) {
  47         SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown data encoding, expected CCDER_CONSTRUCTED_CFSET"), NULL, error);
  48         return NULL;
  49     }
  50
  51     CFMutableSetRef theSet = (set && *set) ? CFSetCreateMutableCopy(allocator, 0, *set)
  52                                            : CFSetCreateMutable(allocator, 0, &kCFTypeSetCallBacks);
  53
  54     if (NULL == theSet) {
  55         SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("Failed to create set"), NULL, error);
  56         payload = NULL;
  57         goto exit;
  58     }
  59
  60     while (payload != NULL && payload < payload_end) {
  61         CFTypeRef value = NULL;
  62
  63         payload = der_decode_plist(allocator, mutability, &value, error, payload, payload_end);
  64
  65         if (payload) {
  66             CFSetAddValue(theSet, value);
  67         }
  68         CFReleaseNull(value);
  69     }
  70
  71
  72 exit:
  73     if (payload == payload_end && set) {
  74         CFTransferRetained(*set, theSet);
  75     }
  76
  77     CFReleaseNull(theSet);
  78
  79     return payload;
  80 }
  81
  82 struct size_context {
  83     bool   success;
  84     size_t size;
  85     CFErrorRef *error;
  86 };
  87
  88 static void add_value_size(const void *value_void, void *context_void)
  89 {
  90     CFTypeRef value = (CFTypeRef) value_void;
  91     struct size_context *context = (struct size_context*) context_void;
  92
  93     if (!context->success)
  94         return;
  95
  96     size_t kv_size = der_sizeof_plist(value, context->error);
  97     if (kv_size == 0) {
  98         context->success = false;
  99         return;
 100     }
 101
 102     context->size += kv_size;
 103 }
 104
 105 size_t der_sizeof_set(CFSetRef dict, CFErrorRef *error)
 106 {
 107     struct size_context context = { .success = true, .size = 0, .error = error };
 108
 109     CFSetApplyFunction(dict, add_value_size, &context);
 110
 111     if (!context.success)
 112         return 0;
 113
 114     return ccder_sizeof(CCDER_CONSTRUCTED_CFSET, context.size);
 115 }
 116
 117 struct encode_context {
 118     bool         success;
 119     CFErrorRef * error;
 120     CFMutableArrayRef list;
 121     CFAllocatorRef allocator;
 122 };
 123
 124 static void add_sequence_to_array(const void *value_void, void *context_void)
 125 {
 126     struct encode_context *context = (struct encode_context *) context_void;
 127     if (context->success) {
 128         size_t der_size = der_sizeof_plist(value_void, context->error);
 129         if (der_size == 0) {
 130             context-> success = false;
 131         } else {
 132             CFMutableDataRef value = CFDataCreateMutable(context->allocator, der_size);
 133             CFDataSetLength(value, der_size);
 134
 135             uint8_t* const encode_begin = CFDataGetMutableBytePtr(value);
 136             uint8_t *encode_end = encode_begin + der_size;
 137
 138             encode_end = der_encode_plist(value_void, context->error, encode_begin, encode_end);
 139
 140             if (encode_end != NULL) {
 141                 CFDataDeleteBytes(value, CFRangeMake(0, (encode_end - encode_begin)));
 142                 CFArrayAppendValue(context->list, value);
 143             } else {
 144                 context-> success = false;
 145             }
 146             CFReleaseNull(value);
 147         }
 148     }
 149 }
 150
 151 static CFComparisonResult cfdata_compare_contents(const void *val1, const void *val2, void *context __unused)
 152 {
 153     return CFDataCompare((CFDataRef) val1, (CFDataRef) val2);
 154 }
 155
 156
 157 uint8_t* der_encode_set(CFSetRef set, CFErrorRef *error,
 158                                const uint8_t *der, uint8_t *der_end)
 159 {
 160     CFMutableArrayRef elements = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
 161
 162     struct encode_context context = { .success = true, .error = error, .list = elements };
 163     CFSetApplyFunction(set, add_sequence_to_array, &context);
 164
 165     if (!context.success) {
 166         CFReleaseNull(elements);
 167         return NULL;
 168     }
 169
 170     CFRange allOfThem = CFRangeMake(0, CFArrayGetCount(elements));
 171
 172     CFArraySortValues(elements, allOfThem, cfdata_compare_contents, NULL);
 173
 174     uint8_t* original_der_end = der_end;
 175
 176     for(CFIndex position = CFArrayGetCount(elements); position > 0;) {
 177         --position;
 178         CFDataRef data = CFArrayGetValueAtIndex(elements, position);
 179         der_end = ccder_encode_body(CFDataGetLength(data), CFDataGetBytePtr(data), der, der_end);
 180     }
 181
 182     CFReleaseNull(elements);
 183
 184     return ccder_encode_constructed_tl(CCDER_CONSTRUCTED_CFSET, original_der_end, der, der_end);
 185
 186 }