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1.2 ! djm 1: /* $OpenBSD: sshbuf-getput-basic.c,v 1.1 2014/04/30 05:29:56 djm Exp $ */
1.1 djm 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: #include <sys/types.h>
19: #include <stdlib.h>
20: #include <stdio.h>
21: #include <string.h>
22:
23: #include "ssherr.h"
24: #define SSHBUF_INTERNAL
25: #include "sshbuf.h"
26:
27: int
28: sshbuf_get(struct sshbuf *buf, void *v, size_t len)
29: {
30: const u_char *p = sshbuf_ptr(buf);
31: int r;
32:
33: if ((r = sshbuf_consume(buf, len)) < 0)
34: return r;
35: if (v != NULL)
36: memcpy(v, p, len);
37: return 0;
38: }
39:
40: int
41: sshbuf_get_u64(struct sshbuf *buf, u_int64_t *valp)
42: {
43: const u_char *p = sshbuf_ptr(buf);
44: int r;
45:
46: if ((r = sshbuf_consume(buf, 8)) < 0)
47: return r;
48: if (valp != NULL)
49: *valp = PEEK_U64(p);
50: return 0;
51: }
52:
53: int
54: sshbuf_get_u32(struct sshbuf *buf, u_int32_t *valp)
55: {
56: const u_char *p = sshbuf_ptr(buf);
57: int r;
58:
59: if ((r = sshbuf_consume(buf, 4)) < 0)
60: return r;
61: if (valp != NULL)
62: *valp = PEEK_U32(p);
63: return 0;
64: }
65:
66: int
67: sshbuf_get_u16(struct sshbuf *buf, u_int16_t *valp)
68: {
69: const u_char *p = sshbuf_ptr(buf);
70: int r;
71:
72: if ((r = sshbuf_consume(buf, 2)) < 0)
73: return r;
74: if (valp != NULL)
75: *valp = PEEK_U16(p);
76: return 0;
77: }
78:
79: int
80: sshbuf_get_u8(struct sshbuf *buf, u_char *valp)
81: {
82: const u_char *p = sshbuf_ptr(buf);
83: int r;
84:
85: if ((r = sshbuf_consume(buf, 1)) < 0)
86: return r;
87: if (valp != NULL)
88: *valp = (u_int8_t)*p;
89: return 0;
90: }
91:
92: int
93: sshbuf_get_string(struct sshbuf *buf, u_char **valp, size_t *lenp)
94: {
95: const u_char *val;
96: size_t len;
97: int r;
98:
99: if (valp != NULL)
100: *valp = NULL;
101: if (lenp != NULL)
102: *lenp = 0;
103: if ((r = sshbuf_get_string_direct(buf, &val, &len)) < 0)
104: return r;
105: if (valp != NULL) {
106: if ((*valp = malloc(len + 1)) == NULL) {
107: SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
108: return SSH_ERR_ALLOC_FAIL;
109: }
110: memcpy(*valp, val, len);
111: (*valp)[len] = '\0';
112: }
113: if (lenp != NULL)
114: *lenp = len;
115: return 0;
116: }
117:
118: int
119: sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp, size_t *lenp)
120: {
121: size_t len;
122: const u_char *p;
123: int r;
124:
125: if (valp != NULL)
126: *valp = NULL;
127: if (lenp != NULL)
128: *lenp = 0;
129: if ((r = sshbuf_peek_string_direct(buf, &p, &len)) < 0)
130: return r;
131: if (valp != 0)
132: *valp = p;
133: if (lenp != NULL)
134: *lenp = len;
135: if (sshbuf_consume(buf, len + 4) != 0) {
136: /* Shouldn't happen */
137: SSHBUF_DBG(("SSH_ERR_INTERNAL_ERROR"));
138: SSHBUF_ABORT();
139: return SSH_ERR_INTERNAL_ERROR;
140: }
141: return 0;
142: }
143:
144: int
145: sshbuf_peek_string_direct(const struct sshbuf *buf, const u_char **valp,
146: size_t *lenp)
147: {
148: u_int32_t len;
149: const u_char *p = sshbuf_ptr(buf);
150:
151: if (valp != NULL)
152: *valp = NULL;
153: if (lenp != NULL)
154: *lenp = 0;
155: if (sshbuf_len(buf) < 4) {
156: SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
157: return SSH_ERR_MESSAGE_INCOMPLETE;
158: }
159: len = PEEK_U32(p);
160: if (len > SSHBUF_SIZE_MAX - 4) {
161: SSHBUF_DBG(("SSH_ERR_STRING_TOO_LARGE"));
162: return SSH_ERR_STRING_TOO_LARGE;
163: }
164: if (sshbuf_len(buf) - 4 < len) {
165: SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
166: return SSH_ERR_MESSAGE_INCOMPLETE;
167: }
168: if (valp != 0)
169: *valp = p + 4;
170: if (lenp != NULL)
171: *lenp = len;
172: return 0;
173: }
174:
175: int
176: sshbuf_get_cstring(struct sshbuf *buf, char **valp, size_t *lenp)
177: {
178: size_t len;
179: const u_char *p, *z;
180: int r;
181:
182: if (valp != NULL)
183: *valp = NULL;
184: if (lenp != NULL)
185: *lenp = 0;
186: if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
187: return r;
188: /* Allow a \0 only at the end of the string */
189: if (len > 0 &&
190: (z = memchr(p , '\0', len)) != NULL && z < p + len - 1) {
191: SSHBUF_DBG(("SSH_ERR_INVALID_FORMAT"));
192: return SSH_ERR_INVALID_FORMAT;
193: }
194: if ((r = sshbuf_skip_string(buf)) != 0)
195: return -1;
196: if (valp != NULL) {
197: if ((*valp = malloc(len + 1)) == NULL) {
198: SSHBUF_DBG(("SSH_ERR_ALLOC_FAIL"));
199: return SSH_ERR_ALLOC_FAIL;
200: }
201: memcpy(*valp, p, len);
202: (*valp)[len] = '\0';
203: }
204: if (lenp != NULL)
205: *lenp = (size_t)len;
206: return 0;
207: }
208:
209: int
210: sshbuf_get_stringb(struct sshbuf *buf, struct sshbuf *v)
211: {
212: u_int32_t len;
213: u_char *p;
214: int r;
215:
216: /*
217: * Use sshbuf_peek_string_direct() to figure out if there is
218: * a complete string in 'buf' and copy the string directly
219: * into 'v'.
220: */
221: if ((r = sshbuf_peek_string_direct(buf, NULL, NULL)) != 0 ||
222: (r = sshbuf_get_u32(buf, &len)) != 0 ||
223: (r = sshbuf_reserve(v, len, &p)) != 0 ||
224: (r = sshbuf_get(buf, p, len)) != 0)
225: return r;
226: return 0;
227: }
228:
229: int
230: sshbuf_put(struct sshbuf *buf, const void *v, size_t len)
231: {
232: u_char *p;
233: int r;
234:
235: if ((r = sshbuf_reserve(buf, len, &p)) < 0)
236: return r;
237: memcpy(p, v, len);
238: return 0;
239: }
240:
241: int
242: sshbuf_putb(struct sshbuf *buf, const struct sshbuf *v)
243: {
244: return sshbuf_put(buf, sshbuf_ptr(v), sshbuf_len(v));
245: }
246:
247: int
248: sshbuf_putf(struct sshbuf *buf, const char *fmt, ...)
249: {
250: va_list ap;
251: int r;
252:
253: va_start(ap, fmt);
254: r = sshbuf_putfv(buf, fmt, ap);
255: va_end(ap);
256: return r;
257: }
258:
259: int
260: sshbuf_putfv(struct sshbuf *buf, const char *fmt, va_list ap)
261: {
262: va_list ap2;
263: int r, len;
264: u_char *p;
265:
266: va_copy(ap2, ap);
267: if ((len = vsnprintf(NULL, 0, fmt, ap2)) < 0) {
268: r = SSH_ERR_INVALID_ARGUMENT;
269: goto out;
270: }
271: if (len == 0) {
272: r = 0;
273: goto out; /* Nothing to do */
274: }
275: va_end(ap2);
276: va_copy(ap2, ap);
277: if ((r = sshbuf_reserve(buf, (size_t)len + 1, &p)) < 0)
278: goto out;
279: if ((r = vsnprintf((char *)p, len + 1, fmt, ap2)) != len) {
280: r = SSH_ERR_INTERNAL_ERROR;
281: goto out; /* Shouldn't happen */
282: }
283: /* Consume terminating \0 */
284: if ((r = sshbuf_consume_end(buf, 1)) != 0)
285: goto out;
286: r = 0;
287: out:
288: va_end(ap2);
289: return r;
290: }
291:
292: int
293: sshbuf_put_u64(struct sshbuf *buf, u_int64_t val)
294: {
295: u_char *p;
296: int r;
297:
298: if ((r = sshbuf_reserve(buf, 8, &p)) < 0)
299: return r;
300: POKE_U64(p, val);
301: return 0;
302: }
303:
304: int
305: sshbuf_put_u32(struct sshbuf *buf, u_int32_t val)
306: {
307: u_char *p;
308: int r;
309:
310: if ((r = sshbuf_reserve(buf, 4, &p)) < 0)
311: return r;
312: POKE_U32(p, val);
313: return 0;
314: }
315:
316: int
317: sshbuf_put_u16(struct sshbuf *buf, u_int16_t val)
318: {
319: u_char *p;
320: int r;
321:
322: if ((r = sshbuf_reserve(buf, 2, &p)) < 0)
323: return r;
324: POKE_U16(p, val);
325: return 0;
326: }
327:
328: int
329: sshbuf_put_u8(struct sshbuf *buf, u_char val)
330: {
331: u_char *p;
332: int r;
333:
334: if ((r = sshbuf_reserve(buf, 1, &p)) < 0)
335: return r;
336: p[0] = val;
337: return 0;
338: }
339:
340: int
341: sshbuf_put_string(struct sshbuf *buf, const void *v, size_t len)
342: {
343: u_char *d;
344: int r;
345:
346: if (len > SSHBUF_SIZE_MAX - 4) {
347: SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
348: return SSH_ERR_NO_BUFFER_SPACE;
349: }
350: if ((r = sshbuf_reserve(buf, len + 4, &d)) < 0)
351: return r;
352: POKE_U32(d, len);
353: memcpy(d + 4, v, len);
354: return 0;
355: }
356:
357: int
358: sshbuf_put_cstring(struct sshbuf *buf, const char *v)
359: {
1.2 ! djm 360: return sshbuf_put_string(buf, (u_char *)v, v == NULL ? 0 : strlen(v));
1.1 djm 361: }
362:
363: int
364: sshbuf_put_stringb(struct sshbuf *buf, const struct sshbuf *v)
365: {
366: return sshbuf_put_string(buf, sshbuf_ptr(v), sshbuf_len(v));
367: }
368:
369: int
370: sshbuf_froms(struct sshbuf *buf, struct sshbuf **bufp)
371: {
372: const u_char *p;
373: size_t len;
374: struct sshbuf *ret;
375: int r;
376:
377: if (buf == NULL || bufp == NULL)
378: return SSH_ERR_INVALID_ARGUMENT;
379: *bufp = NULL;
380: if ((r = sshbuf_peek_string_direct(buf, &p, &len)) != 0)
381: return r;
382: if ((ret = sshbuf_from(p, len)) == NULL)
383: return SSH_ERR_ALLOC_FAIL;
384: if ((r = sshbuf_consume(buf, len + 4)) != 0 || /* Shouldn't happen */
385: (r = sshbuf_set_parent(ret, buf)) != 0) {
386: sshbuf_free(ret);
387: return r;
388: }
389: *bufp = ret;
390: return 0;
391: }
392:
393: int
394: sshbuf_put_bignum2_bytes(struct sshbuf *buf, const void *v, size_t len)
395: {
396: u_char *d;
397: const u_char *s = (const u_char *)v;
398: int r, prepend;
399:
400: if (len > SSHBUF_SIZE_MAX - 5) {
401: SSHBUF_DBG(("SSH_ERR_NO_BUFFER_SPACE"));
402: return SSH_ERR_NO_BUFFER_SPACE;
403: }
404: /* Skip leading zero bytes */
405: for (; len > 0 && *s == 0; len--, s++)
406: ;
407: /*
408: * If most significant bit is set then prepend a zero byte to
409: * avoid interpretation as a negative number.
410: */
411: prepend = len > 0 && (s[0] & 0x80) != 0;
412: if ((r = sshbuf_reserve(buf, len + 4 + prepend, &d)) < 0)
413: return r;
414: POKE_U32(d, len + prepend);
415: if (prepend)
416: d[4] = 0;
417: memcpy(d + 4 + prepend, s, len);
418: return 0;
419: }