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[apple/security.git] / OSX / libsecurity_transform / lib / EncodeDecodeTransforms.c
1 /*
2 * Copyright (c) 2010-2012,2014 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 #include "SecEncodeTransform.h"
25 #include "SecDecodeTransform.h"
26 #include "SecCustomTransform.h"
27 #include "CoreFoundation/CoreFoundation.h"
28 #include "misc.h"
29 #include "Utilities.h"
30 #include <zlib.h>
31 #include <malloc/malloc.h>
32
33 const static CFStringRef DecodeName = CFSTR("com.apple.security.Decoder");
34 const static CFStringRef EncodeName = CFSTR("com.apple.security.Encoder");
35 // base32 & base64 are as per RFC 4648
36 const CFStringRef kSecBase64Encoding = CFSTR("base64");
37 const CFStringRef kSecBase32Encoding = CFSTR("base32");
38 // kSecBase32FDEEncoding is SPI (8436055), it avoids I and O, and uses 8 and 9.
39 // Not good for number form dislexics, but avoids the appearance of a conflict
40 // between 0 and O or 1 and I (note: 0 and 1 are not used anyway, so there is
41 // no conflict).
42 const CFStringRef kSecBase32FDEEncoding = CFSTR("base32FDE");
43 const CFStringRef kSecZLibEncoding = CFSTR("zlib");
44 const CFStringRef kSecEncodeTypeAttribute = CFSTR("EncodeType");
45 const CFStringRef kSecDecodeTypeAttribute = CFSTR("DecodeType");
46 const CFStringRef kSecEncodeLineLengthAttribute = CFSTR("LineLength");
47 const CFStringRef kSecCompressionRatio = CFSTR("CompressionRatio");
48
49 // There is no way to initialize a const CFNumberRef, so these
50 // either need to be non-const, or they need to be a CF type
51 // with a const constructor (CFStringRef).
52 const CFStringRef kSecLineLength64 = CFSTR("64");
53 const CFStringRef kSecLineLength76 = CFSTR("76");
54
55 static unsigned char Base64Vals[] =
56 {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
57 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
58 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
59 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
60 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
61 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
62 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
63 0x3c, 0x3d, 0xff, 0xff, 0xff, 0x40, 0xff, 0xff,
64 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
65 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
66 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
67 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
68 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
69 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
70 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
71 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff,
72 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
73 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
74 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
75 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
76 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
77 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
78 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
79 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
80 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
81 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
82 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
83 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
84 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
85 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
86 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
87 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
88
89 static char Base64Chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
90 "abcdefghijklmnopqrstuvwxyz"
91 "0123456789"
92 "+/=";
93
94 static unsigned char Base32Vals[] = {0xff, 0xff, 0xff,
95 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
96 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
97 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
98 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
99 0xff, 0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0xff, 0xff,
100 0xff, 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03,
101 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
102 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
103 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
104 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
105 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
106 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
107 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
108 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
109 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
110 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
111 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
112 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
113 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
114 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
115 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
116 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
117 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
118
119 static unsigned char Base32FDEVals[] = {0xff, 0xff, 0xff,
120 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
121 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
122 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
123 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
124 0xff, 0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x08, 0x12,
125 0xff, 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03,
126 0x04, 0x05, 0x06, 0x07, 0xff, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
127 0x0f, 0x10, 0x11, 0xff, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
128 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
129 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
130 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
131 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
132 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
133 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
134 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
135 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
136 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
137 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
138 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
139 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
140 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
141 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
142 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
143
144 /* --------------------------------------------------------------------------
145 function: DecodeTransform
146 description: This function returns a block that implements the
147 Decode Transfrom
148 -------------------------------------------------------------------------- */
149 static SecTransformInstanceBlock DecodeTransform(CFStringRef name,
150 SecTransformRef newTransform,
151 SecTransformImplementationRef ref)
152 {
153 SecTransformInstanceBlock instanceBlock =
154 ^{
155 CFErrorRef result = NULL;
156 SecTransformCustomSetAttribute(ref, kSecDecodeTypeAttribute,
157 kSecTransformMetaAttributeRequired, kCFBooleanTrue);
158
159 SecTransformSetAttributeAction(ref,
160 kSecTransformActionAttributeNotification,
161 kSecDecodeTypeAttribute,
162 ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
163 {
164 if (NULL == value || CFGetTypeID(value) != CFStringGetTypeID())
165 {
166 CFErrorRef errorResult = fancy_error(kSecTransformErrorDomain,
167 kSecTransformErrorInvalidInput,
168 CFSTR("Decode type was not a CFStringRef"));
169 return (CFTypeRef)errorResult;
170 }
171 // value is a CFStringRef
172 if (kCFCompareEqualTo == CFStringCompare(value, kSecBase64Encoding, 0))
173 {
174 __block struct { unsigned char a[4]; } leftover;
175 static const short int in_chunk_size = 4;
176 static const short int out_chunk_size = 3;
177 __block int leftover_cnt = 0;
178
179 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
180 ^(CFTypeRef value)
181 {
182 CFDataRef d = value;
183 CFIndex enc_cnt = d ? CFDataGetLength(d) : 0;
184 const unsigned char *enc = d ? CFDataGetBytePtr(d) : NULL;
185 const unsigned char *enc_end = enc + enc_cnt;
186 long n_chunks = (leftover_cnt + enc_cnt) / out_chunk_size + 1;
187
188 unsigned char *out_base = malloc(n_chunks * out_chunk_size);
189 if (!out_base) {
190 return (CFTypeRef) GetNoMemoryError();
191 }
192 unsigned char *out_end = out_base + n_chunks * out_chunk_size;
193 unsigned char *out = out_base;
194 int chunk_i = leftover_cnt;
195
196 for(; enc < enc_end || !enc; chunk_i++) {
197 unsigned char ch, b;
198 if (enc) {
199 ch = *enc++;
200 } else {
201 ch = '=';
202 }
203 if (ch == ' ' || ch == '\n' || ch == '\r') {
204 chunk_i -= 1;
205 continue;
206 }
207
208 b = Base64Vals[ch];
209 if (b != 0xff) {
210 leftover.a[chunk_i] = b;
211 }
212
213 if (chunk_i == in_chunk_size-1 || ch == '=') {
214 *out = (leftover.a[0] & 0x3f) << 2;
215 *out++ |= ((leftover.a[1] & 0x3f) >> 4);
216 *out = (leftover.a[1] & 0x0f) << 4;
217 *out++ |= (leftover.a[2] & 0x3f) >> 2;
218 *out = (leftover.a[2] & 0x03) << 6;
219 *out++ |= (leftover.a[3] & 0x3f);
220
221 out -= 3 - chunk_i;
222 if (ch == '=') {
223 if (chunk_i != 0) {
224 out--;
225 }
226 chunk_i = -1;
227 break;
228 }
229 chunk_i = -1;
230 }
231 }
232 leftover_cnt = (chunk_i > 0) ? chunk_i : 0;
233 if (out > out_end) {
234 // We really shouldn't get here, but if we do we just smashed something.
235 abort();
236 }
237
238 CFDataRef ret = CFDataCreateWithBytesNoCopy(NULL, out_base, out - out_base, kCFAllocatorMalloc);
239 if (!d) {
240 SecTransformCustomSetAttribute(ref, kSecTransformOutputAttributeName,
241 kSecTransformMetaAttributeValue, ret);
242 CFReleaseNull(ret);
243 ret = NULL;
244 }
245 return (CFTypeRef)ret;
246 });
247 }
248 else if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32Encoding, 0) || kCFCompareEqualTo == CFStringCompare(value, kSecBase32FDEEncoding, 0))
249 {
250 __block struct { uint64_t a[2]; } accumulator = { .a = {0, 0}};
251 __block short int bits_accumulated = 0;
252 //static const short int in_chunk_size = 5, out_chunk_size = 8;
253 static const short int out_chunk_size = 8;
254 const short int full_accumulator = 80;
255 unsigned char *base32values = NULL;
256
257 if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32Encoding, 0)) {
258 base32values = Base32Vals;
259 } else if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32FDEEncoding, 0)) {
260 base32values = Base32FDEVals;
261 }
262
263 if (NULL == base32values) {
264 // There is only one supported type, so we don't want to mention it in an error message
265 CFErrorRef bad_type = CreateSecTransformErrorRef(kSecTransformErrorInvalidInput, "Unknown base32 type '%@'", value);
266
267 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, bad_type);
268
269 return (CFTypeRef)bad_type;
270 }
271
272 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
273 ^(CFTypeRef value)
274 {
275 CFDataRef d = value;
276 CFIndex enc_cnt = d ? CFDataGetLength(d) : 0;
277 const unsigned char *enc = d ? CFDataGetBytePtr(d) : NULL;
278 const unsigned char *enc_end = enc + enc_cnt;
279 long n_chunks = (bits_accumulated/8 + enc_cnt) / out_chunk_size + 1;
280
281 unsigned char *out_base = malloc(n_chunks * out_chunk_size);
282 if (!out_base) {
283 return (CFTypeRef)GetNoMemoryError();
284 }
285 unsigned char *out_end = out_base + n_chunks * out_chunk_size;
286 unsigned char *out = out_base;
287
288 for(; enc < enc_end || !d;) {
289 unsigned char ch, b;
290 if (enc) {
291 ch = *enc++;
292 } else {
293 ch = '=';
294 }
295
296 b = base32values[ch];
297 if (b == 0xff) {
298 continue;
299 }
300
301 if (ch != '=') {
302 // 5 new low order bits
303 accumulator.a[1] = accumulator.a[1] << 5 | (0x1f & (accumulator.a[0] >> (64 -5)));
304 accumulator.a[0] = accumulator.a[0] << 5 | b;
305 bits_accumulated += 5;
306 }
307 if (bits_accumulated == full_accumulator || ch == '=') {
308 short shifted = 0;
309 for(; shifted + bits_accumulated < full_accumulator; shifted += 5) {
310 accumulator.a[1] = accumulator.a[1] << 5 | (0x1f & accumulator.a[0] >> (64 -5));
311 accumulator.a[0] = accumulator.a[0] << 5;
312 }
313 for(; bits_accumulated >= 8; bits_accumulated -= 8) {
314 // Get 8 high bits
315 *out++ = accumulator.a[1] >> (80 - 64 - 8);
316 accumulator.a[1] = (accumulator.a[1] << 8 | accumulator.a[0] >> (64 - 8)) & 0xffff;
317 accumulator.a[0] = accumulator.a[0] << 8;
318 }
319 bits_accumulated = 0;
320 if (ch == '=') {
321 break;
322 }
323 }
324 }
325 if (out > out_end) {
326 // We really shouldn't get here, but if we do we just smashed something.
327 abort();
328 }
329
330 CFDataRef ret = CFDataCreateWithBytesNoCopy(NULL, out_base, out - out_base, kCFAllocatorMalloc);
331 if (!d) {
332 SecTransformCustomSetAttribute(ref, kSecTransformOutputAttributeName,
333 kSecTransformMetaAttributeValue, ret);
334 CFReleaseNull(ret);
335 ret = NULL;
336 }
337 return (CFTypeRef)ret;
338 });
339 }
340 else if (kCFCompareEqualTo == CFStringCompare(value, kSecZLibEncoding, 0))
341 {
342 __block z_stream zs;
343 __block Boolean started = FALSE;
344
345 CFBooleanRef hasRatio = (CFBooleanRef)SecTranformCustomGetAttribute(ref,
346 kSecCompressionRatio, kSecTransformMetaAttributeHasOutboundConnections);
347 Boolean ratio_connected = (kCFBooleanTrue == hasRatio);
348
349 bzero(&zs, sizeof(zs));
350
351 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
352 ^(CFTypeRef value)
353 {
354 CFDataRef d = value;
355 if (!started) {
356 if (!d) {
357 return (CFTypeRef)NULL;
358 }
359 started = TRUE;
360 inflateInit(&zs);
361 }
362
363 if (d) {
364 zs.next_in = (UInt8 *)(CFDataGetBytePtr(d)); // we know that zlib will not 'futz' with the data
365 zs.avail_in = (uInt)CFDataGetLength(d);
366 } else {
367 zs.next_in = NULL;
368 zs.avail_in = 0;
369 }
370
371 int rc = Z_OK;
372
373 CFIndex buf_sz = malloc_good_size(zs.avail_in ? zs.avail_in : 1024 * 4);
374
375 while ((d && zs.avail_in) || (d == NULL && rc != Z_STREAM_END)) {
376 unsigned char *buf = malloc(buf_sz);
377 if (!buf) {
378 return (CFTypeRef)GetNoMemoryError();
379 }
380
381 zs.next_out = buf;
382 zs.avail_out = (uInt)buf_sz;
383
384 rc = inflate(&zs, d ? Z_NO_FLUSH : Z_FINISH);
385
386 CFIndex buf_used = buf_sz - zs.avail_out;
387 #ifdef DEBUG_ZLIB_MEMORY_USE
388 // It might be useful to look at these and tweak things like when we should use DataCreate vs. DataCreateWithBytesNoCopy
389 CFfprintf(stderr, ">>zavail_in %d buf_sz %d; d %p; ", zs.avail_in, buf_sz, d);
390 CFfprintf(stderr, "rc=%d %s", rc, (rc == Z_OK) ? "Z_OK" : (rc == Z_STREAM_END) ? "Z_STREAM_END" : (rc == Z_BUF_ERROR) ? "Z_BUF_ERROR" : "?");
391 CFfprintf(stderr, " (output used %d, input left %d)\n", buf_used, zs.avail_in);
392 #endif
393 if (rc == Z_OK || rc == Z_STREAM_END) {
394 CFDataRef d;
395 if ((4 * buf_used) / buf_sz <= 1) {
396 // we would waste 25%+ of the buffer, make a smaller copy and release the original
397 d = CFDataCreate(NULL, buf, buf_used);
398 free(buf);
399 } else {
400 d = CFDataCreateWithBytesNoCopy(NULL, buf, buf_used, kCFAllocatorMalloc);
401 }
402 SecTransformCustomSetAttribute(ref, kSecTransformOutputAttributeName,
403 kSecTransformMetaAttributeValue, d);
404 CFReleaseNull(d);
405 } else if (rc == Z_BUF_ERROR) {
406 free(buf);
407 if ((int)buf_sz > (1 << Z_BEST_COMPRESSION) && 0 == zs.avail_in) {
408 // zlib has an odd convention about EOF and Z_BUF_ERROR, see http://www.zlib.net/zlib_how.html
409 // Z_BUF_ERROR can mean "you don't have a big enough output buffer, please enlarge", or "the input buffer is
410 // empty, please get more data". So if we get Z_BUF_ERROR, and there are 0 bytes of input, and the output
411 // buffer is larger the the maximum number of bytes a single symbol can decode to (2^compression level, which
412 // is at most Z_BEST_COMPRESSION) we KNOW the complaint isn't about the output buffer, but the input
413 // buffer and we are free to go. NOTE: we will only hit this if we are at the end of the stream, and the prior
414 // data chunk was already entirely decoded.
415 rc = Z_STREAM_END;
416 }
417 buf_sz = malloc_good_size(buf_sz * 2);
418 } else {
419 free(buf);
420 CFStringRef emsg = CFStringCreateWithFormat(NULL, NULL, CFSTR("Zlib error#%d"), rc);
421 CFErrorRef err = fancy_error(kSecTransformErrorDomain, kSecTransformErrorInvalidInput, emsg);
422 CFReleaseNull(emsg);
423 return (CFTypeRef)err;
424 }
425 }
426
427 if (ratio_connected && zs.total_in && zs.total_out) {
428 float r = (float)zs.total_in / zs.total_out;
429 CFNumberRef ratio = CFNumberCreate(NULL, kCFNumberFloatType, &r);
430 SecTransformCustomSetAttribute(ref, kSecCompressionRatio,
431 kSecTransformMetaAttributeValue, ratio);
432 CFReleaseNull(ratio);
433 }
434
435 if (rc == Z_OK) {
436 return (CFTypeRef)SecTransformNoData();
437 } else if (rc == Z_STREAM_END) {
438 inflateEnd(&zs);
439 started = FALSE;
440 return (CFTypeRef)NULL;
441 }
442 CFStringRef emsg = CFStringCreateWithFormat(NULL, NULL, CFSTR("Zlib error#%d"), rc);
443 CFErrorRef err = fancy_error(kSecTransformErrorDomain, kSecTransformErrorInvalidInput, emsg);
444 CFReleaseNull(emsg);
445 return (CFTypeRef)err;
446 });
447 }
448 else
449 {
450 CFErrorRef bad_type = CreateSecTransformErrorRef(kSecTransformErrorInvalidInput, "Unsupported decode type '%@', supported types are kSecBase64Encoding, kSecBase32Encoding, and kSecGZipEncoding", value);
451
452 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, bad_type);
453
454 return (CFTypeRef)bad_type;
455 }
456 return value;
457 });
458
459 return result;
460 };
461
462 return Block_copy(instanceBlock);
463 }
464
465
466 SecTransformRef SecDecodeTransformCreate(CFTypeRef DecodeType, CFErrorRef* error) {
467
468 static dispatch_once_t once;
469 __block Boolean ok = TRUE;
470 CFErrorRef localError = NULL;
471
472 dispatch_block_t aBlock = ^
473 {
474 ok = SecTransformRegister(DecodeName, &DecodeTransform, (CFErrorRef*)&localError);
475 };
476
477 dispatch_once(&once, aBlock);
478
479 if (!ok || NULL != localError)
480 {
481 if (NULL != error)
482 {
483 *error = localError;
484 }
485 return NULL;
486 }
487
488 SecTransformRef tr = SecTransformCreate(DecodeName, &localError);
489 if (!tr || NULL != localError)
490 {
491 // There might be a leak if tr is returned but localError is
492 // not NULL, but that should not happen
493 if (NULL != error)
494 {
495 *error = localError;
496 }
497 CFSafeRelease(tr); // protect against leaking tr
498 return NULL;
499 }
500
501 SecTransformSetAttribute(tr, kSecDecodeTypeAttribute, DecodeType, &localError);
502 if (NULL != localError)
503 {
504 CFReleaseNull(tr);
505 tr = NULL;
506 if (NULL != error)
507 {
508 *error = localError;
509 }
510 }
511
512 return tr;
513 }
514
515 static
516 unsigned char *encode_base64(const unsigned char *bin, unsigned char *base64, CFIndex bin_cnt) {
517 for(; bin_cnt > 0; bin_cnt -= 3, base64 += 4, bin += 3) {
518 switch (bin_cnt)
519 {
520 default:
521 case 3:
522 base64[0] = Base64Chars[((bin[0] >> 2) & 0x3f)];
523 base64[1] = Base64Chars[((bin[0] & 0x03) << 4) |
524 ((bin[1] >> 4) & 0x0f)];
525 base64[2] = Base64Chars[((bin[1] & 0x0f) << 2) |
526 ((bin[2] >> 6) & 0x03)];
527 base64[3] = Base64Chars[(bin[2] & 0x3f)];
528 break;
529
530 case 2:
531 base64[3] = '=';
532 base64[0] = Base64Chars[((bin[0] >> 2) & 0x3f)];
533 base64[1] = Base64Chars[((bin[0] & 0x03) << 4) |
534 ((bin[1] >> 4) & 0x0f)];
535 base64[2] = Base64Chars[((bin[1] & 0x0f) << 2)];
536 break;
537
538 case 1:
539 base64[3] = base64[2] = '=';
540 base64[0] = Base64Chars[((bin[0] >> 2) & 0x3f)];
541 base64[1] = Base64Chars[((bin[0] & 0x03) << 4)];
542 break;
543
544 case 0:
545 base64[0] = base64[1] = base64[2] = base64[3] = '=';
546 break;
547 }
548 }
549
550 return base64;
551 }
552
553
554 /* --------------------------------------------------------------------------
555 function: DecodeTransform
556 description: This function returns a block that implements the
557 Decode Transfrom
558 -------------------------------------------------------------------------- */
559 static SecTransformInstanceBlock EncodeTransform(CFStringRef name,
560 SecTransformRef newTransform,
561 SecTransformImplementationRef ref)
562
563 {
564 SecTransformInstanceBlock instanceBlock =
565 ^{
566 CFErrorRef result = NULL;
567 SecTransformCustomSetAttribute(ref, kSecEncodeTypeAttribute,
568 kSecTransformMetaAttributeRequired, kCFBooleanTrue);
569
570 __block int line_length = 0, target_line_length = 0;
571
572 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification,
573 kSecEncodeLineLengthAttribute,
574 ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
575 {
576 SecTransformPushbackAttribute(ref, attribute, value);
577 return value;
578 });
579
580 CFTypeRef (^new_line_length)(int out_chunk_size, CFTypeRef value) = ^(int out_chunk_size, CFTypeRef value)
581 {
582 if (CFGetTypeID(value) == CFNumberGetTypeID()) {
583 CFNumberGetValue((CFNumberRef)value, kCFNumberIntType, &target_line_length);
584 } else if (CFGetTypeID(value) == CFStringGetTypeID()) {
585 int requested_length = CFStringGetIntValue(value);
586 if (requested_length == 0 && CFStringCompare(CFSTR("0"), value, kCFCompareAnchored)) {
587 CFErrorRef error = CreateSecTransformErrorRef(kSecTransformErrorInvalidInput, "Could not convert '%@' to a number, please set %@ to a numeric value", kSecEncodeLineLengthAttribute, value);
588 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, error);
589 CFReleaseNull(error);
590 } else {
591 target_line_length = requested_length;
592 }
593 } else {
594 CFStringRef valueType = CFCopyTypeIDDescription(CFGetTypeID(value));
595 CFErrorRef error = CreateSecTransformErrorRef(kSecTransformErrorInvalidType, "%@ requires a CFNumber, but was set to a %@ (%@)", kSecEncodeLineLengthAttribute, valueType, value);
596 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, error);
597 CFReleaseNull(valueType);
598 CFReleaseNull(error);
599 }
600 target_line_length -= target_line_length % out_chunk_size;
601
602 if (target_line_length < 0) {
603 target_line_length = 0;
604 }
605
606 return value;
607 };
608
609 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification,
610 kSecEncodeTypeAttribute,
611 ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
612 {
613 if (NULL == value || CFGetTypeID(value) != CFStringGetTypeID())
614 {
615 CFErrorRef errorResult = fancy_error(kSecTransformErrorDomain,
616 kSecTransformErrorInvalidInput,
617 CFSTR("Encode type was not a CFStringRef"));
618 return (CFTypeRef)errorResult;
619 }
620
621 if (kCFCompareEqualTo == CFStringCompare(value, kSecBase64Encoding, 0))
622 {
623 __block struct { unsigned char a[3]; } leftover;
624 static const short int in_chunk_size = 3, out_chunk_size = 4;
625 __block CFIndex leftover_cnt = 0;
626
627 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification,
628 kSecEncodeLineLengthAttribute,
629 ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
630 {
631 return new_line_length(out_chunk_size, value);
632 });
633
634 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
635 ^(CFTypeRef value)
636 {
637 CFDataRef d = value;
638 CFIndex in_len = d ? CFDataGetLength(d) : 0;
639 const unsigned char *in = d ? CFDataGetBytePtr(d) : NULL;
640 CFIndex n_chunks = in_len / in_chunk_size + 3;
641 CFIndex buf_len = n_chunks * out_chunk_size;
642 CFIndex line_len=0;
643
644 if (target_line_length)
645 {
646 line_len=(n_chunks * out_chunk_size) / target_line_length;
647 }
648 if ( (in_len<0)
649 || (leftover_cnt<0)
650 #if __LLP64__
651 || (n_chunks > LONG_LONG_MAX/out_chunk_size)
652 || (buf_len > LONG_LONG_MAX-line_len)
653 #else
654 || (n_chunks > LONG_MAX/out_chunk_size)
655 || (buf_len > LONG_MAX-line_len)
656 #endif
657 || (buf_len+line_len<in_len))
658 {
659 CFErrorRef errorResult = fancy_error(kSecTransformErrorDomain,
660 kSecTransformErrorInvalidLength,
661 CFSTR("Invalid length"));
662 return (CFTypeRef)errorResult;
663 }
664 buf_len+=line_len;
665 unsigned char *out = malloc(buf_len);
666 unsigned char *out_end = out + buf_len, *out_base = out;
667 if (!out)
668 {
669 return (CFTypeRef)GetNoMemoryError();
670 }
671 if ((leftover_cnt) && (in_chunk_size>= leftover_cnt))
672 {
673 CFIndex copy_len = in_chunk_size - leftover_cnt;
674 copy_len = (copy_len > in_len) ? in_len : copy_len;
675 memcpy(leftover.a + leftover_cnt, in, copy_len);
676
677 if (copy_len + leftover_cnt == in_chunk_size || d == NULL)
678 {
679 out = encode_base64(leftover.a, out, copy_len + leftover_cnt);
680 if (in)
681 {
682 in += copy_len;
683 in_len -= copy_len;
684 }
685 }
686 else
687 {
688 free(out);
689 leftover_cnt += copy_len;
690 return (CFTypeRef)SecTransformNoData();
691 }
692 }
693
694 CFIndex chunked_in_len;
695 while (in_len >= in_chunk_size)
696 {
697 chunked_in_len = in_len - (in_len % in_chunk_size);
698 if (target_line_length)
699 {
700 if (target_line_length <= line_length + out_chunk_size)
701 {
702 *out++ = '\n';
703 line_length = 0;
704 }
705 int max_process = (((target_line_length - line_length) / out_chunk_size) * in_chunk_size);
706 chunked_in_len = (chunked_in_len < max_process) ? chunked_in_len : max_process;
707 }
708 unsigned char *old_out = out;
709 out = encode_base64(in, out, chunked_in_len);
710 line_length += out - old_out;
711 in += chunked_in_len;
712 in_len -= chunked_in_len;
713 }
714 leftover_cnt = in_len;
715 if (leftover_cnt)
716 {
717 memcpy(leftover.a, in, leftover_cnt);
718 }
719
720 if (out > out_end)
721 {
722 // we should never hit this, but if we do there is no recovery: we smashed past a buffer into the heap
723 abort();
724 }
725
726 CFTypeRef ret = CFDataCreateWithBytesNoCopy(NULL, out_base, out - out_base, kCFAllocatorMalloc);
727 if (!d)
728 {
729 SecTransformCustomSetAttribute(ref,kSecTransformOutputAttributeName, kSecTransformMetaAttributeValue, ret);
730 CFReleaseNull(ret);
731 ret = NULL;
732 }
733 return ret;
734 });
735 }
736 else if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32Encoding, 0) || kCFCompareEqualTo == CFStringCompare(value, kSecBase32FDEEncoding, 0))
737 {
738 __block struct { uint64_t a[2]; } accumulator = { .a = {0, 0} };
739 __block short int bits_accumulated = 0;
740 static const short int in_chunk_size = 5;
741 static const short int out_chunk_size = 8;
742 char *base32alphabet = NULL;
743
744 if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32Encoding, 0)) {
745 base32alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
746 } else if (kCFCompareEqualTo == CFStringCompare(value, kSecBase32FDEEncoding, 0)) {
747 base32alphabet = "ABCDEFGH8JKLMNOPQR9TUVWXYZ234567";
748 }
749
750 if (NULL == base32alphabet) {
751 // There is only one supported type, so we don't want to mention it in an error message
752 CFErrorRef bad_type = CreateSecTransformErrorRef(kSecTransformErrorInvalidInput, "Unknown base32 type '%@'", value);
753
754 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, bad_type);
755
756 return (CFTypeRef)bad_type;
757 }
758
759 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification,
760 kSecEncodeLineLengthAttribute,
761 ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
762 {
763 return new_line_length(out_chunk_size, value);
764 });
765
766 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
767 ^(CFTypeRef value)
768 {
769 CFDataRef d = value;
770 CFIndex in_len = d ? CFDataGetLength(d) : 0;
771 const unsigned char *in = d ? CFDataGetBytePtr(d) : NULL;
772 const unsigned char *in_end = in + in_len;
773 CFIndex n_chunks = in_len / in_chunk_size + 3;
774 CFIndex buf_len = n_chunks * out_chunk_size;
775 if (target_line_length)
776 {
777 buf_len += (n_chunks * out_chunk_size) / target_line_length;
778 }
779 __block unsigned char *out = malloc(buf_len);
780 unsigned char *out_end = out + buf_len, *out_base = out;
781 if (!out) {
782 return (CFTypeRef)GetNoMemoryError();
783 }
784
785 void (^chunk)(void) = ^{
786 // Grab the 5 bit (log(32)==5) values from the 80 bit accumulator. Most signifigant bits first
787
788 // (this could be done without the loop, which would save few cycles at the end of a stream)
789 short int shift = 80 - bits_accumulated;
790 for(; shift > 0; shift -= 8) {
791 accumulator.a[1] = accumulator.a[1] << 8 | accumulator.a[0] >> (64 - 8);
792 accumulator.a[0] = accumulator.a[0] << 8;
793 }
794
795 for(; bits_accumulated > 0; bits_accumulated -= 5) {
796 *out++ = base32alphabet[(accumulator.a[1] >> 11) & 0x1f];
797 accumulator.a[1] = 0xffff & (accumulator.a[1] << 5 | (accumulator.a[0] >> (64 - 5)));
798 accumulator.a[0] = accumulator.a[0] << 5;
799 if (++line_length >= target_line_length && target_line_length) {
800 *out++ = '\n';
801 line_length = 0;
802 }
803 }
804 bits_accumulated = 0;
805 };
806
807 for (; in < in_end; in++)
808 {
809 accumulator.a[1] = accumulator.a[1] << 8 | accumulator.a[0] >> (64 - 8);
810 accumulator.a[0] = accumulator.a[0] << 8 | *in;
811 bits_accumulated += 8;
812 if (bits_accumulated == 8*in_chunk_size)
813 {
814 chunk();
815 }
816 }
817
818 if (!d && bits_accumulated) {
819 short int padding = 0;
820 switch(bits_accumulated) {
821 case 8:
822 padding = 6;
823 break;
824 case 16:
825 padding = 4;
826 break;
827 case 24:
828 padding = 3;
829 break;
830 case 32:
831 padding = 1;
832 break;
833 }
834 chunk();
835 int i;
836 for(i = 0; i < padding; i++) {
837 *out++ = '=';
838 }
839 }
840
841 if (out > out_end) {
842 // we should never hit this, but if we do there is no recovery: we smashed past a buffer into the heap
843 abort();
844 }
845
846 CFTypeRef ret = NULL;
847 if (out - out_base) {
848 ret = CFDataCreateWithBytesNoCopy(NULL, out_base, out - out_base, kCFAllocatorMalloc);
849 } else {
850 ret = CFRetainSafe(SecTransformNoData());
851 }
852 if (!d) {
853 if (ret != SecTransformNoData()) {
854 SecTransformCustomSetAttribute(ref, kSecTransformOutputAttributeName,
855 kSecTransformMetaAttributeValue, ret);
856 }
857 CFSafeRelease(ret);
858 ret = NULL;
859 }
860 return ret;
861 });
862 }
863 else if (kCFCompareEqualTo == CFStringCompare(value, kSecZLibEncoding, 0))
864 {
865 __block z_stream zs;
866 bzero(&zs, sizeof(zs));
867 __block int clevel = Z_DEFAULT_COMPRESSION;
868 __block Boolean started = FALSE;
869
870 CFBooleanRef hasRatio = (CFBooleanRef)SecTranformCustomGetAttribute(ref, kSecCompressionRatio,
871 kSecTransformMetaAttributeHasOutboundConnections);
872
873 Boolean ratio_connected = (kCFBooleanTrue == hasRatio);
874
875 SecTransformSetDataAction(ref, kSecTransformActionProcessData,
876 ^(CFTypeRef value)
877 {
878 CFDataRef d = value;
879
880 if (!started) {
881 started = TRUE;
882 deflateInit(&zs, clevel);
883 }
884
885 if (d) {
886 zs.next_in = (UInt8 *)CFDataGetBytePtr(d); // We know that xLib will not 'Futz' with the data
887 zs.avail_in = (uInt)CFDataGetLength(d);
888 } else {
889 zs.next_in = NULL;
890 zs.avail_in = 0;
891 }
892
893 int rc = Z_BUF_ERROR;
894
895 CFIndex buf_sz = malloc_good_size(zs.avail_in ? zs.avail_in : 1024 * 4);
896
897 while ((d && zs.avail_in) || (d == NULL && rc != Z_STREAM_END)) {
898 unsigned char *buf = malloc(buf_sz);
899 if (!buf) {
900 return (CFTypeRef)GetNoMemoryError();
901 }
902
903 zs.next_out = buf;
904 zs.avail_out = (uInt)buf_sz;
905
906 rc = deflate(&zs, d ? Z_NO_FLUSH : Z_FINISH);
907
908 CFIndex buf_used = buf_sz - zs.avail_out;
909 #ifdef DEBUG_ZLIB_MEMORY_USE
910 // It might be useful to look at these and tweak things like when we should use DataCreate vs. DataCreateWithBytesNoCopy
911 CFfprintf(stderr, "<<zavail_in %d buf_sz %d; d %p; ", zs.avail_in, buf_sz, d);
912 CFfprintf(stderr, "rc=%d %s", rc, (rc == Z_OK) ? "Z_OK" : (rc == Z_STREAM_END) ? "Z_FINISH" : (rc == Z_BUF_ERROR) ? "Z_BUF_ERROR" : "?");
913 CFfprintf(stderr, " (output used %d, input left %d)\n", buf_used, zs.avail_in);
914 #endif
915 if (rc == Z_OK || rc == Z_STREAM_END) {
916 CFDataRef d;
917 if ((4 * buf_used) / buf_sz <= 1) {
918 // we would waste 25%+ of the buffer, make a smaller copy and release the original
919 d = CFDataCreate(NULL, buf, buf_used);
920 free(buf);
921 } else {
922 d = CFDataCreateWithBytesNoCopy(NULL, buf, buf_used, kCFAllocatorMalloc);
923 }
924 SecTransformCustomSetAttribute(ref, kSecTransformOutputAttributeName,
925 kSecTransformMetaAttributeValue, d);
926 CFReleaseNull(d);
927 } else if (rc == Z_BUF_ERROR) {
928 free(buf);
929 buf_sz = malloc_good_size(buf_sz * 2);
930 } else {
931 free(buf);
932 CFStringRef emsg = CFStringCreateWithFormat(NULL, NULL, CFSTR("Zlib error#%d"), rc);
933 CFErrorRef err = fancy_error(kSecTransformErrorDomain, kSecTransformErrorInvalidInput, emsg);
934 CFReleaseNull(emsg);
935 return (CFTypeRef)err;
936 }
937 }
938 if (ratio_connected && zs.total_in && zs.total_out) {
939 float r = (float)zs.total_out / zs.total_in;
940 CFNumberRef ratio = CFNumberCreate(NULL, kCFNumberFloatType, &r);
941 SecTransformCustomSetAttribute(ref, kSecCompressionRatio,
942 kSecTransformMetaAttributeValue, ratio);
943 CFReleaseNull(ratio);
944 }
945 if (d) {
946 return (CFTypeRef)SecTransformNoData();
947 } else {
948 deflateEnd(&zs);
949 started = FALSE;
950 return (CFTypeRef)NULL;
951 }
952 });
953
954 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification,
955 kSecEncodeLineLengthAttribute, ^(SecTransformStringOrAttributeRef attribute, CFTypeRef value)
956 {
957 return value;
958 });
959 }
960 else
961 {
962 CFErrorRef bad_type = CreateSecTransformErrorRef(kSecTransformErrorInvalidInput, "Unsupported encode type '%@', supported types are kSecBase64Encoding, kSecBase32Encoding, and kSecGZipEncoding", value);
963
964 SecTransformCustomSetAttribute(ref, kSecTransformAbortAttributeName, kSecTransformMetaAttributeValue, bad_type);
965
966 return (CFTypeRef)bad_type;
967 }
968
969 return (CFTypeRef)value;
970 });
971
972 return result;
973 };
974
975 return Block_copy(instanceBlock);
976 }
977
978 SecTransformRef SecEncodeTransformCreate(CFTypeRef EncodeType, CFErrorRef* error)
979 {
980
981 static dispatch_once_t once;
982 __block Boolean ok = TRUE;
983 CFErrorRef localError = NULL;
984
985 dispatch_block_t aBlock = ^
986 {
987 ok = SecTransformRegister(EncodeName, &EncodeTransform, (CFErrorRef*)&localError);
988 };
989
990 dispatch_once(&once, aBlock);
991
992 if (!ok || NULL != localError)
993 {
994 if (NULL != error)
995 {
996 *error = localError;
997 }
998
999 return NULL;
1000 }
1001
1002 SecTransformRef tr = SecTransformCreate(EncodeName, &localError);
1003 if (!tr || NULL != localError)
1004 {
1005 if (NULL != error)
1006 {
1007 *error = localError;
1008 }
1009 CFSafeRelease(tr);
1010 return NULL;
1011 }
1012
1013 SecTransformSetAttribute(tr, kSecEncodeTypeAttribute, EncodeType, &localError);
1014 if (NULL != localError)
1015 {
1016 CFReleaseNull(tr);
1017 tr = NULL;
1018 if (NULL != error)
1019 {
1020 *error = localError;
1021 }
1022 }
1023
1024 return tr;
1025 }
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