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-rw-r--r--sshbuf-getput-basic.c421
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diff --git a/sshbuf-getput-basic.c b/sshbuf-getput-basic.c
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1/* $OpenBSD: sshbuf-getput-basic.c,v 1.1 2014/04/30 05:29:56 djm Exp $ */
2/*
3 * Copyright (c) 2011 Damien Miller
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#define SSHBUF_INTERNAL
19#include "includes.h"
20
21#include <sys/types.h>
22#include <stdlib.h>
23#include <stdio.h>
24#include <string.h>
25
26#include "ssherr.h"
27#include "sshbuf.h"
28
29int
30sshbuf_get(struct sshbuf *buf, void *v, size_t len)
31{
32 const u_char *p = sshbuf_ptr(buf);
33 int r;
34
35 if ((r = sshbuf_consume(buf, len)) < 0)
36 return r;
37 if (v != NULL)
38 memcpy(v, p, len);
39 return 0;
40}
41
42int
43sshbuf_get_u64(struct sshbuf *buf, u_int64_t *valp)
44{
45 const u_char *p = sshbuf_ptr(buf);
46 int r;
47
48 if ((r = sshbuf_consume(buf, 8)) < 0)
49 return r;
50 if (valp != NULL)
51 *valp = PEEK_U64(p);
52 return 0;
53}
54
55int
56sshbuf_get_u32(struct sshbuf *buf, u_int32_t *valp)
57{
58 const u_char *p = sshbuf_ptr(buf);
59 int r;
60
61 if ((r = sshbuf_consume(buf, 4)) < 0)
62 return r;
63 if (valp != NULL)
64 *valp = PEEK_U32(p);
65 return 0;
66}
67
68int
69sshbuf_get_u16(struct sshbuf *buf, u_int16_t *valp)
70{
71 const u_char *p = sshbuf_ptr(buf);
72 int r;
73
74 if ((r = sshbuf_consume(buf, 2)) < 0)
75 return r;
76 if (valp != NULL)
77 *valp = PEEK_U16(p);
78 return 0;
79}
80
81int
82sshbuf_get_u8(struct sshbuf *buf, u_char *valp)
83{
84 const u_char *p = sshbuf_ptr(buf);
85 int r;
86
87 if ((r = sshbuf_consume(buf, 1)) < 0)
88 return r;
89 if (valp != NULL)
90 *valp = (u_int8_t)*p;
91 return 0;
92}
93
94int
95sshbuf_get_string(struct sshbuf *buf, u_char **valp, size_t *lenp)
96{
97 const u_char *val;
98 size_t len;
99 int r;
100
101 if (valp != NULL)
102 *valp = NULL;
103 if (lenp != NULL)
104 *lenp = 0;
105 if ((r = sshbuf_get_string_direct(buf, &val, &len)) < 0)
106 return r;
107 if (valp != NULL) {
108 if ((*valp = malloc(len + 1)) == NULL) {
109 SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
110 return SSH_ERR_ALLOC_FAIL;
111 }
112 memcpy(*valp, val, len);
113 (*valp)[len] = '\0';
114 }
115 if (lenp != NULL)
116 *lenp = len;
117 return 0;
118}
119
120int
121sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp, size_t *lenp)
122{
123 size_t len;
124 const u_char *p;
125 int r;
126
127 if (valp != NULL)
128 *valp = NULL;
129 if (lenp != NULL)
130 *lenp = 0;
131 if ((r = sshbuf_peek_string_direct(buf, &p, &len)) < 0)
132 return r;
133 if (valp != 0)
134 *valp = p;
135 if (lenp != NULL)
136 *lenp = len;
137 if (sshbuf_consume(buf, len + 4) != 0) {
138 /* Shouldn't happen */
139 SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
140 SSHBUF_ABORT();
141 return SSH_ERR_INTERNAL_ERROR;
142 }
143 return 0;
144}
145
146int
147sshbuf_peek_string_direct(const struct sshbuf *buf, const u_char **valp,
148 size_t *lenp)
149{
150 u_int32_t len;
151 const u_char *p = sshbuf_ptr(buf);
152
153 if (valp != NULL)
154 *valp = NULL;
155 if (lenp != NULL)
156 *lenp = 0;
157 if (sshbuf_len(buf) < 4) {
158 SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
159 return SSH_ERR_MESSAGE_INCOMPLETE;
160 }
161 len = PEEK_U32(p);
162 if (len > SSHBUF_SIZE_MAX - 4) {
163 SSHBUF_DBG(("SSH_ERR_STRING_TOO_LARGE"));
164 return SSH_ERR_STRING_TOO_LARGE;
165 }
166 if (sshbuf_len(buf) - 4 < len) {
167 SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
168 return SSH_ERR_MESSAGE_INCOMPLETE;
169 }
170 if (valp != 0)
171 *valp = p + 4;
172 if (lenp != NULL)
173 *lenp = len;
174 return 0;
175}
176
177int
178sshbuf_get_cstring(struct sshbuf *buf, char **valp, size_t *lenp)
179{
180 size_t len;
181 const u_char *p, *z;
182 int r;
183
184 if (valp != NULL)
185 *valp = NULL;
186 if (lenp != NULL)
187 *lenp = 0;
188 if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
189 return r;
190 /* Allow a \0 only at the end of the string */
191 if (len > 0 &&
192 (z = memchr(p , '\0', len)) != NULL && z < p + len - 1) {
193 SSHBUF_DBG(("SSH_ERR_INVALID_FORMAT"));
194 return SSH_ERR_INVALID_FORMAT;
195 }
196 if ((r = sshbuf_skip_string(buf)) != 0)
197 return -1;
198 if (valp != NULL) {
199 if ((*valp = malloc(len + 1)) == NULL) {
200 SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
201 return SSH_ERR_ALLOC_FAIL;
202 }
203 memcpy(*valp, p, len);
204 (*valp)[len] = '\0';
205 }
206 if (lenp != NULL)
207 *lenp = (size_t)len;
208 return 0;
209}
210
211int
212sshbuf_get_stringb(struct sshbuf *buf, struct sshbuf *v)
213{
214 u_int32_t len;
215 u_char *p;
216 int r;
217
218 /*
219 * Use sshbuf_peek_string_direct() to figure out if there is
220 * a complete string in 'buf' and copy the string directly
221 * into 'v'.
222 */
223 if ((r = sshbuf_peek_string_direct(buf, NULL, NULL)) != 0 ||
224 (r = sshbuf_get_u32(buf, &len)) != 0 ||
225 (r = sshbuf_reserve(v, len, &p)) != 0 ||
226 (r = sshbuf_get(buf, p, len)) != 0)
227 return r;
228 return 0;
229}
230
231int
232sshbuf_put(struct sshbuf *buf, const void *v, size_t len)
233{
234 u_char *p;
235 int r;
236
237 if ((r = sshbuf_reserve(buf, len, &p)) < 0)
238 return r;
239 memcpy(p, v, len);
240 return 0;
241}
242
243int
244sshbuf_putb(struct sshbuf *buf, const struct sshbuf *v)
245{
246 return sshbuf_put(buf, sshbuf_ptr(v), sshbuf_len(v));
247}
248
249int
250sshbuf_putf(struct sshbuf *buf, const char *fmt, ...)
251{
252 va_list ap;
253 int r;
254
255 va_start(ap, fmt);
256 r = sshbuf_putfv(buf, fmt, ap);
257 va_end(ap);
258 return r;
259}
260
261int
262sshbuf_putfv(struct sshbuf *buf, const char *fmt, va_list ap)
263{
264 va_list ap2;
265 int r, len;
266 u_char *p;
267
268 va_copy(ap2, ap);
269 if ((len = vsnprintf(NULL, 0, fmt, ap2)) < 0) {
270 r = SSH_ERR_INVALID_ARGUMENT;
271 goto out;
272 }
273 if (len == 0) {
274 r = 0;
275 goto out; /* Nothing to do */
276 }
277 va_end(ap2);
278 va_copy(ap2, ap);
279 if ((r = sshbuf_reserve(buf, (size_t)len + 1, &p)) < 0)
280 goto out;
281 if ((r = vsnprintf((char *)p, len + 1, fmt, ap2)) != len) {
282 r = SSH_ERR_INTERNAL_ERROR;
283 goto out; /* Shouldn't happen */
284 }
285 /* Consume terminating \0 */
286 if ((r = sshbuf_consume_end(buf, 1)) != 0)
287 goto out;
288 r = 0;
289 out:
290 va_end(ap2);
291 return r;
292}
293
294int
295sshbuf_put_u64(struct sshbuf *buf, u_int64_t val)
296{
297 u_char *p;
298 int r;
299
300 if ((r = sshbuf_reserve(buf, 8, &p)) < 0)
301 return r;
302 POKE_U64(p, val);
303 return 0;
304}
305
306int
307sshbuf_put_u32(struct sshbuf *buf, u_int32_t val)
308{
309 u_char *p;
310 int r;
311
312 if ((r = sshbuf_reserve(buf, 4, &p)) < 0)
313 return r;
314 POKE_U32(p, val);
315 return 0;
316}
317
318int
319sshbuf_put_u16(struct sshbuf *buf, u_int16_t val)
320{
321 u_char *p;
322 int r;
323
324 if ((r = sshbuf_reserve(buf, 2, &p)) < 0)
325 return r;
326 POKE_U16(p, val);
327 return 0;
328}
329
330int
331sshbuf_put_u8(struct sshbuf *buf, u_char val)
332{
333 u_char *p;
334 int r;
335
336 if ((r = sshbuf_reserve(buf, 1, &p)) < 0)
337 return r;
338 p[0] = val;
339 return 0;
340}
341
342int
343sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len)
344{
345 u_char *d;
346 int r;
347
348 if (len > SSHBUF_SIZE_MAX - 4) {
349 SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
350 return SSH_ERR_NO_BUFFER_SPACE;
351 }
352 if ((r = sshbuf_reserve(buf, len + 4, &d)) < 0)
353 return r;
354 POKE_U32(d, len);
355 memcpy(d + 4, v, len);
356 return 0;
357}
358
359int
360sshbuf_put_cstring(struct sshbuf *buf, const char *v)
361{
362 return sshbuf_put_string(buf, (u_char *)v, strlen(v));
363}
364
365int
366sshbuf_put_stringb(struct sshbuf *buf, const struct sshbuf *v)
367{
368 return sshbuf_put_string(buf, sshbuf_ptr(v), sshbuf_len(v));
369}
370
371int
372sshbuf_froms(struct sshbuf *buf, struct sshbuf **bufp)
373{
374 const u_char *p;
375 size_t len;
376 struct sshbuf *ret;
377 int r;
378
379 if (buf == NULL || bufp == NULL)
380 return SSH_ERR_INVALID_ARGUMENT;
381 *bufp = NULL;
382 if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
383 return r;
384 if ((ret = sshbuf_from(p, len)) == NULL)
385 return SSH_ERR_ALLOC_FAIL;
386 if ((r = sshbuf_consume(buf, len + 4)) != 0 || /* Shouldn't happen */
387 (r = sshbuf_set_parent(ret, buf)) != 0) {
388 sshbuf_free(ret);
389 return r;
390 }
391 *bufp = ret;
392 return 0;
393}
394
395int
396sshbuf_put_bignum2_bytes(struct sshbuf *buf, const void *v, size_t len)
397{
398 u_char *d;
399 const u_char *s = (const u_char *)v;
400 int r, prepend;
401
402 if (len > SSHBUF_SIZE_MAX - 5) {
403 SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
404 return SSH_ERR_NO_BUFFER_SPACE;
405 }
406 /* Skip leading zero bytes */
407 for (; len > 0 && *s == 0; len--, s++)
408 ;
409 /*
410 * If most significant bit is set then prepend a zero byte to
411 * avoid interpretation as a negative number.
412 */
413 prepend = len > 0 && (s[0] & 0x80) != 0;
414 if ((r = sshbuf_reserve(buf, len + 4 + prepend, &d)) < 0)
415 return r;
416 POKE_U32(d, len + prepend);
417 if (prepend)
418 d[4] = 0;
419 memcpy(d + 4 + prepend, s, len);
420 return 0;
421}