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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 | } |
3171bad6 | 65 | if (allocbytes != NULL) |
829754a6 | 66 | *allocbytes = WPACKET_get_curr(pkt); |
b7273855 | 67 | |
0217dd19 | 68 | return 1; |
b7273855 MC |
69 | } |
70 | ||
1ff84340 MC |
71 | int WPACKET_sub_reserve_bytes__(WPACKET *pkt, size_t len, |
72 | unsigned char **allocbytes, size_t lenbytes) | |
b2b3024e | 73 | { |
1ff84340 | 74 | if (!WPACKET_reserve_bytes(pkt, lenbytes + len, allocbytes)) |
b2b3024e MC |
75 | return 0; |
76 | ||
1ff84340 MC |
77 | *allocbytes += lenbytes; |
78 | ||
b2b3024e MC |
79 | return 1; |
80 | } | |
81 | ||
871bc59b MC |
82 | static size_t maxmaxsize(size_t lenbytes) |
83 | { | |
84 | if (lenbytes >= sizeof(size_t) || lenbytes == 0) | |
85 | return SIZE_MAX; | |
df065a2b MC |
86 | |
87 | return ((size_t)1 << (lenbytes * 8)) - 1 + lenbytes; | |
871bc59b MC |
88 | } |
89 | ||
9b36b7d9 | 90 | static int wpacket_intern_init_len(WPACKET *pkt, size_t lenbytes) |
b7273855 | 91 | { |
de451856 MC |
92 | unsigned char *lenchars; |
93 | ||
de451856 | 94 | pkt->curr = 0; |
0217dd19 | 95 | pkt->written = 0; |
b7273855 | 96 | |
0217dd19 MC |
97 | pkt->subs = OPENSSL_zalloc(sizeof(*pkt->subs)); |
98 | if (pkt->subs == NULL) | |
99 | return 0; | |
b7273855 | 100 | |
0217dd19 | 101 | if (lenbytes == 0) |
b7273855 | 102 | return 1; |
b7273855 | 103 | |
0217dd19 MC |
104 | pkt->subs->pwritten = lenbytes; |
105 | pkt->subs->lenbytes = lenbytes; | |
106 | ||
de451856 | 107 | if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) { |
0217dd19 MC |
108 | OPENSSL_free(pkt->subs); |
109 | pkt->subs = NULL; | |
b7273855 MC |
110 | return 0; |
111 | } | |
9b36b7d9 | 112 | pkt->subs->packet_len = lenchars - GETBUF(pkt); |
b7273855 MC |
113 | |
114 | return 1; | |
115 | } | |
116 | ||
9b36b7d9 MC |
117 | int WPACKET_init_static_len(WPACKET *pkt, unsigned char *buf, size_t len, |
118 | size_t lenbytes) | |
119 | { | |
120 | size_t max = maxmaxsize(lenbytes); | |
121 | ||
122 | /* Internal API, so should not fail */ | |
123 | assert(buf != NULL && len > 0); | |
124 | if (buf == NULL || len == 0) | |
125 | return 0; | |
126 | ||
127 | pkt->staticbuf = buf; | |
128 | pkt->buf = NULL; | |
129 | pkt->maxsize = (max < len) ? max : len; | |
130 | ||
131 | return wpacket_intern_init_len(pkt, lenbytes); | |
132 | } | |
133 | ||
134 | int WPACKET_init_len(WPACKET *pkt, BUF_MEM *buf, size_t lenbytes) | |
135 | { | |
136 | /* Internal API, so should not fail */ | |
137 | assert(buf != NULL); | |
138 | if (buf == NULL) | |
139 | return 0; | |
140 | ||
141 | pkt->staticbuf = NULL; | |
142 | pkt->buf = buf; | |
143 | pkt->maxsize = maxmaxsize(lenbytes); | |
144 | ||
145 | return wpacket_intern_init_len(pkt, lenbytes); | |
146 | } | |
147 | ||
ae2f7b37 | 148 | int WPACKET_init(WPACKET *pkt, BUF_MEM *buf) |
b7273855 | 149 | { |
ae2f7b37 | 150 | return WPACKET_init_len(pkt, buf, 0); |
b7273855 MC |
151 | } |
152 | ||
ae2f7b37 | 153 | int WPACKET_set_flags(WPACKET *pkt, unsigned int flags) |
b7273855 | 154 | { |
c39609aa MC |
155 | /* Internal API, so should not fail */ |
156 | assert(pkt->subs != NULL); | |
0217dd19 MC |
157 | if (pkt->subs == NULL) |
158 | return 0; | |
159 | ||
160 | pkt->subs->flags = flags; | |
b7273855 MC |
161 | |
162 | return 1; | |
163 | } | |
164 | ||
c0f9e23c MC |
165 | /* Store the |value| of length |len| at location |data| */ |
166 | static int put_value(unsigned char *data, size_t value, size_t len) | |
82657355 | 167 | { |
c0f9e23c | 168 | for (data += len - 1; len > 0; len--) { |
82657355 MC |
169 | *data = (unsigned char)(value & 0xff); |
170 | data--; | |
171 | value >>= 8; | |
172 | } | |
173 | ||
174 | /* Check whether we could fit the value in the assigned number of bytes */ | |
175 | if (value > 0) | |
176 | return 0; | |
177 | ||
178 | return 1; | |
179 | } | |
180 | ||
0217dd19 | 181 | |
b7273855 | 182 | /* |
a2b7e655 MC |
183 | * Internal helper function used by WPACKET_close(), WPACKET_finish() and |
184 | * WPACKET_fill_lengths() to close a sub-packet and write out its length if | |
185 | * necessary. If |doclose| is 0 then it goes through the motions of closing | |
186 | * (i.e. it fills in all the lengths), but doesn't actually close anything. | |
b7273855 | 187 | */ |
a2b7e655 | 188 | static int wpacket_intern_close(WPACKET *pkt, WPACKET_SUB *sub, int doclose) |
b7273855 | 189 | { |
de451856 | 190 | size_t packlen = pkt->written - sub->pwritten; |
b7273855 | 191 | |
0217dd19 | 192 | if (packlen == 0 |
c0f9e23c | 193 | && (sub->flags & WPACKET_FLAGS_NON_ZERO_LENGTH) != 0) |
b7273855 MC |
194 | return 0; |
195 | ||
196 | if (packlen == 0 | |
de451856 | 197 | && sub->flags & WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH) { |
a2b7e655 MC |
198 | /* We can't handle this case. Return an error */ |
199 | if (!doclose) | |
200 | return 0; | |
201 | ||
ae2f7b37 | 202 | /* Deallocate any bytes allocated for the length of the WPACKET */ |
0217dd19 MC |
203 | if ((pkt->curr - sub->lenbytes) == sub->packet_len) { |
204 | pkt->written -= sub->lenbytes; | |
205 | pkt->curr -= sub->lenbytes; | |
b7273855 MC |
206 | } |
207 | ||
208 | /* Don't write out the packet length */ | |
de451856 MC |
209 | sub->packet_len = 0; |
210 | sub->lenbytes = 0; | |
b7273855 MC |
211 | } |
212 | ||
ae2f7b37 | 213 | /* Write out the WPACKET length if needed */ |
609b0852 | 214 | if (sub->lenbytes > 0 |
9b36b7d9 MC |
215 | && !put_value(&GETBUF(pkt)[sub->packet_len], packlen, |
216 | sub->lenbytes)) | |
b7273855 | 217 | return 0; |
b7273855 | 218 | |
a2b7e655 MC |
219 | if (doclose) { |
220 | pkt->subs = sub->parent; | |
221 | OPENSSL_free(sub); | |
222 | } | |
223 | ||
224 | return 1; | |
225 | } | |
226 | ||
227 | int WPACKET_fill_lengths(WPACKET *pkt) | |
228 | { | |
229 | WPACKET_SUB *sub; | |
230 | ||
231 | assert(pkt->subs != NULL); | |
232 | if (pkt->subs == NULL) | |
233 | return 0; | |
234 | ||
fed60a78 | 235 | for (sub = pkt->subs; sub != NULL; sub = sub->parent) { |
a2b7e655 MC |
236 | if (!wpacket_intern_close(pkt, sub, 0)) |
237 | return 0; | |
fed60a78 | 238 | } |
b7273855 MC |
239 | |
240 | return 1; | |
241 | } | |
242 | ||
0217dd19 | 243 | int WPACKET_close(WPACKET *pkt) |
b7273855 | 244 | { |
c39609aa MC |
245 | /* |
246 | * Internal API, so should not fail - but we do negative testing of this | |
247 | * so no assert (otherwise the tests fail) | |
248 | */ | |
0217dd19 | 249 | if (pkt->subs == NULL || pkt->subs->parent == NULL) |
b7273855 MC |
250 | return 0; |
251 | ||
a2b7e655 | 252 | return wpacket_intern_close(pkt, pkt->subs, 1); |
b7273855 MC |
253 | } |
254 | ||
0217dd19 | 255 | int WPACKET_finish(WPACKET *pkt) |
b7273855 | 256 | { |
0217dd19 MC |
257 | int ret; |
258 | ||
c39609aa MC |
259 | /* |
260 | * Internal API, so should not fail - but we do negative testing of this | |
261 | * so no assert (otherwise the tests fail) | |
262 | */ | |
0217dd19 MC |
263 | if (pkt->subs == NULL || pkt->subs->parent != NULL) |
264 | return 0; | |
265 | ||
a2b7e655 | 266 | ret = wpacket_intern_close(pkt, pkt->subs, 1); |
871bc59b MC |
267 | if (ret) { |
268 | OPENSSL_free(pkt->subs); | |
269 | pkt->subs = NULL; | |
270 | } | |
de451856 | 271 | |
0217dd19 | 272 | return ret; |
b7273855 MC |
273 | } |
274 | ||
869d0a37 | 275 | int WPACKET_start_sub_packet_len__(WPACKET *pkt, size_t lenbytes) |
b7273855 | 276 | { |
0217dd19 | 277 | WPACKET_SUB *sub; |
de451856 | 278 | unsigned char *lenchars; |
b7273855 | 279 | |
c39609aa MC |
280 | /* Internal API, so should not fail */ |
281 | assert(pkt->subs != NULL); | |
0217dd19 | 282 | if (pkt->subs == NULL) |
b7273855 MC |
283 | return 0; |
284 | ||
0217dd19 MC |
285 | sub = OPENSSL_zalloc(sizeof(*sub)); |
286 | if (sub == NULL) | |
b7273855 MC |
287 | return 0; |
288 | ||
0217dd19 MC |
289 | sub->parent = pkt->subs; |
290 | pkt->subs = sub; | |
291 | sub->pwritten = pkt->written + lenbytes; | |
292 | sub->lenbytes = lenbytes; | |
293 | ||
294 | if (lenbytes == 0) { | |
de451856 | 295 | sub->packet_len = 0; |
0217dd19 MC |
296 | return 1; |
297 | } | |
298 | ||
de451856 | 299 | if (!WPACKET_allocate_bytes(pkt, lenbytes, &lenchars)) |
0217dd19 | 300 | return 0; |
4b0fc9fc | 301 | /* Convert to an offset in case the underlying BUF_MEM gets realloc'd */ |
9b36b7d9 | 302 | sub->packet_len = lenchars - GETBUF(pkt); |
b7273855 MC |
303 | |
304 | return 1; | |
305 | } | |
306 | ||
0217dd19 MC |
307 | int WPACKET_start_sub_packet(WPACKET *pkt) |
308 | { | |
869d0a37 | 309 | return WPACKET_start_sub_packet_len__(pkt, 0); |
0217dd19 MC |
310 | } |
311 | ||
08029dfa | 312 | int WPACKET_put_bytes__(WPACKET *pkt, unsigned int val, size_t size) |
b7273855 MC |
313 | { |
314 | unsigned char *data; | |
315 | ||
c39609aa MC |
316 | /* Internal API, so should not fail */ |
317 | assert(size <= sizeof(unsigned int)); | |
c0f9e23c | 318 | |
de451856 | 319 | if (size > sizeof(unsigned int) |
82657355 MC |
320 | || !WPACKET_allocate_bytes(pkt, size, &data) |
321 | || !put_value(data, val, size)) | |
b7273855 MC |
322 | return 0; |
323 | ||
324 | return 1; | |
325 | } | |
326 | ||
ae2f7b37 | 327 | int WPACKET_set_max_size(WPACKET *pkt, size_t maxsize) |
b7273855 | 328 | { |
871bc59b MC |
329 | WPACKET_SUB *sub; |
330 | size_t lenbytes; | |
331 | ||
c39609aa MC |
332 | /* Internal API, so should not fail */ |
333 | assert(pkt->subs != NULL); | |
871bc59b MC |
334 | if (pkt->subs == NULL) |
335 | return 0; | |
336 | ||
337 | /* Find the WPACKET_SUB for the top level */ | |
de451856 MC |
338 | for (sub = pkt->subs; sub->parent != NULL; sub = sub->parent) |
339 | continue; | |
871bc59b MC |
340 | |
341 | lenbytes = sub->lenbytes; | |
342 | if (lenbytes == 0) | |
343 | lenbytes = sizeof(pkt->maxsize); | |
344 | ||
345 | if (maxmaxsize(lenbytes) < maxsize || maxsize < pkt->written) | |
346 | return 0; | |
347 | ||
0217dd19 | 348 | pkt->maxsize = maxsize; |
b7273855 MC |
349 | |
350 | return 1; | |
351 | } | |
352 | ||
ae2f7b37 | 353 | int WPACKET_memcpy(WPACKET *pkt, const void *src, size_t len) |
b7273855 MC |
354 | { |
355 | unsigned char *dest; | |
356 | ||
357 | if (len == 0) | |
358 | return 1; | |
359 | ||
ae2f7b37 | 360 | if (!WPACKET_allocate_bytes(pkt, len, &dest)) |
b7273855 MC |
361 | return 0; |
362 | ||
363 | memcpy(dest, src, len); | |
364 | ||
365 | return 1; | |
366 | } | |
367 | ||
869d0a37 MC |
368 | int WPACKET_sub_memcpy__(WPACKET *pkt, const void *src, size_t len, |
369 | size_t lenbytes) | |
fb790f16 | 370 | { |
869d0a37 | 371 | if (!WPACKET_start_sub_packet_len__(pkt, lenbytes) |
fb790f16 MC |
372 | || !WPACKET_memcpy(pkt, src, len) |
373 | || !WPACKET_close(pkt)) | |
374 | return 0; | |
375 | ||
376 | return 1; | |
377 | } | |
378 | ||
ae2f7b37 | 379 | int WPACKET_get_total_written(WPACKET *pkt, size_t *written) |
b7273855 | 380 | { |
c39609aa MC |
381 | /* Internal API, so should not fail */ |
382 | assert(written != NULL); | |
871bc59b | 383 | if (written == NULL) |
b7273855 MC |
384 | return 0; |
385 | ||
0217dd19 | 386 | *written = pkt->written; |
b7273855 MC |
387 | |
388 | return 1; | |
389 | } | |
390 | ||
ae2f7b37 | 391 | int WPACKET_get_length(WPACKET *pkt, size_t *len) |
b7273855 | 392 | { |
c39609aa MC |
393 | /* Internal API, so should not fail */ |
394 | assert(pkt->subs != NULL && len != NULL); | |
0217dd19 | 395 | if (pkt->subs == NULL || len == NULL) |
b7273855 MC |
396 | return 0; |
397 | ||
0217dd19 | 398 | *len = pkt->written - pkt->subs->pwritten; |
b7273855 MC |
399 | |
400 | return 1; | |
401 | } | |
871bc59b | 402 | |
3171bad6 MC |
403 | unsigned char *WPACKET_get_curr(WPACKET *pkt) |
404 | { | |
405 | return GETBUF(pkt) + pkt->curr; | |
406 | } | |
407 | ||
871bc59b MC |
408 | void WPACKET_cleanup(WPACKET *pkt) |
409 | { | |
410 | WPACKET_SUB *sub, *parent; | |
411 | ||
412 | for (sub = pkt->subs; sub != NULL; sub = parent) { | |
413 | parent = sub->parent; | |
414 | OPENSSL_free(sub); | |
415 | } | |
416 | pkt->subs = NULL; | |
417 | } |