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b7273855 MC |
1 | /* |
2 | * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the OpenSSL license (the "License"). You may not use | |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
8 | */ | |
9 | ||
c39609aa | 10 | #include <assert.h> |
b7273855 MC |
11 | #include "packet_locl.h" |
12 | ||
871bc59b MC |
13 | #define DEFAULT_BUF_SIZE 256 |
14 | ||
0217dd19 | 15 | int WPACKET_allocate_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes) |
1ff84340 MC |
16 | { |
17 | if (!WPACKET_reserve_bytes(pkt, len, allocbytes)) | |
18 | return 0; | |
ff819477 | 19 | |
1ff84340 MC |
20 | pkt->written += len; |
21 | pkt->curr += len; | |
1ff84340 MC |
22 | return 1; |
23 | } | |
24 | ||
25 | int WPACKET_sub_allocate_bytes__(WPACKET *pkt, size_t len, | |
26 | unsigned char **allocbytes, size_t lenbytes) | |
27 | { | |
28 | if (!WPACKET_start_sub_packet_len__(pkt, lenbytes) | |
29 | || !WPACKET_allocate_bytes(pkt, len, allocbytes) | |
30 | || !WPACKET_close(pkt)) | |
31 | return 0; | |
32 | ||
33 | return 1; | |
34 | } | |
35 | ||
9b36b7d9 MC |
36 | #define GETBUF(p) (((p)->staticbuf != NULL) \ |
37 | ? (p)->staticbuf : (unsigned char *)(p)->buf->data) | |
38 | ||
1ff84340 | 39 | int WPACKET_reserve_bytes(WPACKET *pkt, size_t len, unsigned char **allocbytes) |
b7273855 | 40 | { |
c39609aa MC |
41 | /* Internal API, so should not fail */ |
42 | assert(pkt->subs != NULL && len != 0); | |
0217dd19 MC |
43 | if (pkt->subs == NULL || len == 0) |
44 | return 0; | |
b7273855 | 45 | |
6ae4f5e0 | 46 | if (pkt->maxsize - pkt->written < len) |
b7273855 MC |
47 | return 0; |
48 | ||
9b36b7d9 | 49 | if (pkt->staticbuf == NULL && (pkt->buf->length - pkt->written < len)) { |
b7273855 | 50 | size_t newlen; |
f789b04f | 51 | size_t reflen; |
b7273855 | 52 | |
f789b04f MC |
53 | reflen = (len > pkt->buf->length) ? len : pkt->buf->length; |
54 | ||
55 | if (reflen > SIZE_MAX / 2) { | |
b7273855 | 56 | newlen = SIZE_MAX; |
871bc59b | 57 | } else { |
f789b04f MC |
58 | newlen = reflen * 2; |
59 | if (newlen < DEFAULT_BUF_SIZE) | |
60 | newlen = DEFAULT_BUF_SIZE; | |
871bc59b | 61 | } |
0217dd19 MC |
62 | if (BUF_MEM_grow(pkt->buf, newlen) == 0) |
63 | return 0; | |
b7273855 | 64 | } |
9b36b7d9 | 65 | *allocbytes = GETBUF(pkt) + pkt->curr; |
b7273855 | 66 | |
0217dd19 | 67 | return 1; |
b7273855 MC |
68 | } |
69 | ||
1ff84340 MC |
70 | int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len, |
71 | unsigned char **allocbytes, size_t lenbytes) | |
b2b3024e | 72 | { |
1ff84340 | 73 | if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes)) |
b2b3024e MC |
74 | return 0; |
75 | ||
1ff84340 MC |
76 | *allocbytes += lenbytes; |
77 | ||
b2b3024e MC |
78 | return 1; |
79 | } | |
80 | ||
871bc59b MC |
81 | static size_t maxmaxsize(size_t lenbytes) |
82 | { | |
83 | if (lenbytes >= sizeof(size_t) || lenbytes == 0) | |
84 | return SIZE_MAX; | |
df065a2b MC |
85 | |
86 | return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes; | |
871bc59b MC |
87 | } |
88 | ||
9b36b7d9 | 89 | static int wpacket_intern_init_len(WPACKET *pkt, size_t lenbytes) |
b7273855 | 90 | { |
de451856 MC |
91 | unsigned char *lenchars; |
92 | ||
de451856 | 93 | pkt->curr = 0; |
0217dd19 | 94 | pkt->written = 0; |
b7273855 | 95 | |
0217dd19 MC |
96 | pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs)); |
97 | if (pkt->subs == NULL) | |
98 | return 0; | |
b7273855 | 99 | |
0217dd19 | 100 | if (lenbytes == 0) |
b7273855 | 101 | return 1; |
b7273855 | 102 | |
0217dd19 MC |
103 | pkt->subs->pwritten = lenbytes; |
104 | pkt->subs->lenbytes = lenbytes; | |
105 | ||
de451856 | 106 | if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) { |
0217dd19 MC |
107 | OPENSSL_free(pkt->subs); |
108 | pkt->subs = NULL; | |
b7273855 MC |
109 | return 0; |
110 | } | |
9b36b7d9 | 111 | pkt->subs->packet_len = lenchars - GETBUF(pkt); |
b7273855 MC |
112 | |
113 | return 1; | |
114 | } | |
115 | ||
9b36b7d9 MC |
116 | int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len, |
117 | size_t lenbytes) | |
118 | { | |
119 | size_t max = maxmaxsize(lenbytes); | |
120 | ||
121 | /* Internal API, so should not fail */ | |
122 | assert(buf != NULL && len > 0); | |
123 | if (buf == NULL || len == 0) | |
124 | return 0; | |
125 | ||
126 | pkt->staticbuf = buf; | |
127 | pkt->buf = NULL; | |
128 | pkt->maxsize = (max < len) ? max : len; | |
129 | ||
130 | return wpacket_intern_init_len(pkt, lenbytes); | |
131 | } | |
132 | ||
133 | int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes) | |
134 | { | |
135 | /* Internal API, so should not fail */ | |
136 | assert(buf != NULL); | |
137 | if (buf == NULL) | |
138 | return 0; | |
139 | ||
140 | pkt->staticbuf = NULL; | |
141 | pkt->buf = buf; | |
142 | pkt->maxsize = maxmaxsize(lenbytes); | |
143 | ||
144 | return wpacket_intern_init_len(pkt, lenbytes); | |
145 | } | |
146 | ||
ae2f7b37 | 147 | int WPACKET_init(WPACKET *pkt, BUF_MEM *buf) |
b7273855 | 148 | { |
ae2f7b37 | 149 | return WPACKET_init_len(pkt, buf, 0); |
b7273855 MC |
150 | } |
151 | ||
ae2f7b37 | 152 | int WPACKET_set_flags(WPACKET *pkt, unsigned int flags) |
b7273855 | 153 | { |
c39609aa MC |
154 | /* Internal API, so should not fail */ |
155 | assert(pkt->subs != NULL); | |
0217dd19 MC |
156 | if (pkt->subs == NULL) |
157 | return 0; | |
158 | ||
159 | pkt->subs->flags = flags; | |
b7273855 MC |
160 | |
161 | return 1; | |
162 | } | |
163 | ||
c0f9e23c MC |
164 | /* Store the |value| of length |len| at location |data| */ |
165 | static int put_value(unsigned char *data, size_t value, size_t len) | |
82657355 | 166 | { |
c0f9e23c | 167 | for (data += len - 1; len > 0; len--) { |
82657355 MC |
168 | *data = (unsigned char)(value & 0xff); |
169 | data--; | |
170 | value >>= 8; | |
171 | } | |
172 | ||
173 | /* Check whether we could fit the value in the assigned number of bytes */ | |
174 | if (value > 0) | |
175 | return 0; | |
176 | ||
177 | return 1; | |
178 | } | |
179 | ||
0217dd19 | 180 | |
b7273855 | 181 | /* |
0217dd19 MC |
182 | * Internal helper function used by WPACKET_close() and WPACKET_finish() to |
183 | * close a sub-packet and write out its length if necessary. | |
b7273855 | 184 | */ |
0217dd19 | 185 | static int wpacket_intern_close(WPACKET *pkt) |
b7273855 | 186 | { |
0217dd19 | 187 | WPACKET_SUB *sub = pkt->subs; |
de451856 | 188 | size_t packlen = pkt->written - sub->pwritten; |
b7273855 | 189 | |
0217dd19 | 190 | if (packlen == 0 |
c0f9e23c | 191 | && (sub->flags & WPACKET_FLAGS_NON_ZERO_LENGTH) != 0) |
b7273855 MC |
192 | return 0; |
193 | ||
194 | if (packlen == 0 | |
de451856 | 195 | && sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) { |
ae2f7b37 | 196 | /* Deallocate any bytes allocated for the length of the WPACKET */ |
0217dd19 MC |
197 | if ((pkt->curr - sub->lenbytes) == sub->packet_len) { |
198 | pkt->written -= sub->lenbytes; | |
199 | pkt->curr -= sub->lenbytes; | |
b7273855 MC |
200 | } |
201 | ||
202 | /* Don't write out the packet length */ | |
de451856 MC |
203 | sub->packet_len = 0; |
204 | sub->lenbytes = 0; | |
b7273855 MC |
205 | } |
206 | ||
ae2f7b37 | 207 | /* Write out the WPACKET length if needed */ |
609b0852 | 208 | if (sub->lenbytes > 0 |
9b36b7d9 MC |
209 | && !put_value(&GETBUF(pkt)[sub->packet_len], packlen, |
210 | sub->lenbytes)) | |
b7273855 | 211 | return 0; |
b7273855 | 212 | |
0217dd19 MC |
213 | pkt->subs = sub->parent; |
214 | OPENSSL_free(sub); | |
b7273855 MC |
215 | |
216 | return 1; | |
217 | } | |
218 | ||
0217dd19 | 219 | int WPACKET_close(WPACKET *pkt) |
b7273855 | 220 | { |
c39609aa MC |
221 | /* |
222 | * Internal API, so should not fail - but we do negative testing of this | |
223 | * so no assert (otherwise the tests fail) | |
224 | */ | |
0217dd19 | 225 | if (pkt->subs == NULL || pkt->subs->parent == NULL) |
b7273855 MC |
226 | return 0; |
227 | ||
0217dd19 | 228 | return wpacket_intern_close(pkt); |
b7273855 MC |
229 | } |
230 | ||
0217dd19 | 231 | int WPACKET_finish(WPACKET *pkt) |
b7273855 | 232 | { |
0217dd19 MC |
233 | int ret; |
234 | ||
c39609aa MC |
235 | /* |
236 | * Internal API, so should not fail - but we do negative testing of this | |
237 | * so no assert (otherwise the tests fail) | |
238 | */ | |
0217dd19 MC |
239 | if (pkt->subs == NULL || pkt->subs->parent != NULL) |
240 | return 0; | |
241 | ||
242 | ret = wpacket_intern_close(pkt); | |
871bc59b MC |
243 | if (ret) { |
244 | OPENSSL_free(pkt->subs); | |
245 | pkt->subs = NULL; | |
246 | } | |
de451856 | 247 | |
0217dd19 | 248 | return ret; |
b7273855 MC |
249 | } |
250 | ||
869d0a37 | 251 | int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes) |
b7273855 | 252 | { |
0217dd19 | 253 | WPACKET_SUB *sub; |
de451856 | 254 | unsigned char *lenchars; |
b7273855 | 255 | |
c39609aa MC |
256 | /* Internal API, so should not fail */ |
257 | assert(pkt->subs != NULL); | |
0217dd19 | 258 | if (pkt->subs == NULL) |
b7273855 MC |
259 | return 0; |
260 | ||
0217dd19 MC |
261 | sub = OPENSSL_zalloc(sizeof(*sub)); |
262 | if (sub == NULL) | |
b7273855 MC |
263 | return 0; |
264 | ||
0217dd19 MC |
265 | sub->parent = pkt->subs; |
266 | pkt->subs = sub; | |
267 | sub->pwritten = pkt->written + lenbytes; | |
268 | sub->lenbytes = lenbytes; | |
269 | ||
270 | if (lenbytes == 0) { | |
de451856 | 271 | sub->packet_len = 0; |
0217dd19 MC |
272 | return 1; |
273 | } | |
274 | ||
de451856 | 275 | if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) |
0217dd19 | 276 | return 0; |
4b0fc9fc | 277 | /* Convert to an offset in case the underlying BUF_MEM gets realloc'd */ |
9b36b7d9 | 278 | sub->packet_len = lenchars - GETBUF(pkt); |
b7273855 MC |
279 | |
280 | return 1; | |
281 | } | |
282 | ||
0217dd19 MC |
283 | int WPACKET_start_sub_packet(WPACKET *pkt) |
284 | { | |
869d0a37 | 285 | return WPACKET_start_sub_packet_len__(pkt, 0); |
0217dd19 MC |
286 | } |
287 | ||
08029dfa | 288 | int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size) |
b7273855 MC |
289 | { |
290 | unsigned char *data; | |
291 | ||
c39609aa MC |
292 | /* Internal API, so should not fail */ |
293 | assert(size <= sizeof(unsigned int)); | |
c0f9e23c | 294 | |
de451856 | 295 | if (size > sizeof(unsigned int) |
82657355 MC |
296 | || !WPACKET_allocate_bytes(pkt, size, &data) |
297 | || !put_value(data, val, size)) | |
b7273855 MC |
298 | return 0; |
299 | ||
300 | return 1; | |
301 | } | |
302 | ||
ae2f7b37 | 303 | int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize) |
b7273855 | 304 | { |
871bc59b MC |
305 | WPACKET_SUB *sub; |
306 | size_t lenbytes; | |
307 | ||
c39609aa MC |
308 | /* Internal API, so should not fail */ |
309 | assert(pkt->subs != NULL); | |
871bc59b MC |
310 | if (pkt->subs == NULL) |
311 | return 0; | |
312 | ||
313 | /* Find the WPACKET_SUB for the top level */ | |
de451856 MC |
314 | for (sub = pkt->subs; sub->parent != NULL; sub = sub->parent) |
315 | continue; | |
871bc59b MC |
316 | |
317 | lenbytes = sub->lenbytes; | |
318 | if (lenbytes == 0) | |
319 | lenbytes = sizeof(pkt->maxsize); | |
320 | ||
321 | if (maxmaxsize(lenbytes) < maxsize || maxsize < pkt->written) | |
322 | return 0; | |
323 | ||
0217dd19 | 324 | pkt->maxsize = maxsize; |
b7273855 MC |
325 | |
326 | return 1; | |
327 | } | |
328 | ||
ae2f7b37 | 329 | int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len) |
b7273855 MC |
330 | { |
331 | unsigned char *dest; | |
332 | ||
333 | if (len == 0) | |
334 | return 1; | |
335 | ||
ae2f7b37 | 336 | if (!WPACKET_allocate_bytes(pkt, len, &dest)) |
b7273855 MC |
337 | return 0; |
338 | ||
339 | memcpy(dest, src, len); | |
340 | ||
341 | return 1; | |
342 | } | |
343 | ||
869d0a37 MC |
344 | int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len, |
345 | size_t lenbytes) | |
fb790f16 | 346 | { |
869d0a37 | 347 | if (!WPACKET_start_sub_packet_len__(pkt, lenbytes) |
fb790f16 MC |
348 | || !WPACKET_memcpy(pkt, src, len) |
349 | || !WPACKET_close(pkt)) | |
350 | return 0; | |
351 | ||
352 | return 1; | |
353 | } | |
354 | ||
ae2f7b37 | 355 | int WPACKET_get_total_written(WPACKET *pkt, size_t *written) |
b7273855 | 356 | { |
c39609aa MC |
357 | /* Internal API, so should not fail */ |
358 | assert(written != NULL); | |
871bc59b | 359 | if (written == NULL) |
b7273855 MC |
360 | return 0; |
361 | ||
0217dd19 | 362 | *written = pkt->written; |
b7273855 MC |
363 | |
364 | return 1; | |
365 | } | |
366 | ||
ae2f7b37 | 367 | int WPACKET_get_length(WPACKET *pkt, size_t *len) |
b7273855 | 368 | { |
c39609aa MC |
369 | /* Internal API, so should not fail */ |
370 | assert(pkt->subs != NULL && len != NULL); | |
0217dd19 | 371 | if (pkt->subs == NULL || len == NULL) |
b7273855 MC |
372 | return 0; |
373 | ||
0217dd19 | 374 | *len = pkt->written - pkt->subs->pwritten; |
b7273855 MC |
375 | |
376 | return 1; | |
377 | } | |
871bc59b | 378 | |
871bc59b MC |
379 | void WPACKET_cleanup(WPACKET *pkt) |
380 | { | |
381 | WPACKET_SUB *sub, *parent; | |
382 | ||
383 | for (sub = pkt->subs; sub != NULL; sub = parent) { | |
384 | parent = sub->parent; | |
385 | OPENSSL_free(sub); | |
386 | } | |
387 | pkt->subs = NULL; | |
388 | } |