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