1 /* $OpenBSD: sshbuf-misc.c,v 1.18 2022/01/22 00:43:43 djm Exp $ */
3 * Copyright (c) 2011 Damien Miller
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.
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.
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <netinet/in.h>
36 #define SSHBUF_INTERNAL
40 sshbuf_dump_data(const void *s, size_t len, FILE *f)
43 const u_char *p = (const u_char *)s;
45 for (i = 0; i < len; i += 16) {
46 fprintf(f, "%.4zu: ", i);
47 for (j = i; j < i + 16; j++) {
49 fprintf(f, "%02x ", p[j]);
54 for (j = i; j < i + 16; j++) {
56 if (isascii(p[j]) && isprint(p[j]))
57 fprintf(f, "%c", p[j]);
67 sshbuf_dump(const struct sshbuf *buf, FILE *f)
69 fprintf(f, "buffer len = %zu\n", sshbuf_len(buf));
70 sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
74 sshbuf_dtob16(struct sshbuf *buf)
76 size_t i, j, len = sshbuf_len(buf);
77 const u_char *p = sshbuf_ptr(buf);
79 const char hex[] = "0123456789abcdef";
83 if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
85 for (i = j = 0; i < len; i++) {
86 ret[j++] = hex[(p[i] >> 4) & 0xf];
87 ret[j++] = hex[p[i] & 0xf];
94 sshbuf_dtob64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
100 if (d == NULL || b64 == NULL || sshbuf_len(d) >= SIZE_MAX / 2)
101 return SSH_ERR_INVALID_ARGUMENT;
102 if (sshbuf_len(d) == 0)
104 slen = ((sshbuf_len(d) + 2) / 3) * 4 + 1;
105 if ((s = malloc(slen)) == NULL)
106 return SSH_ERR_ALLOC_FAIL;
107 if (b64_ntop(sshbuf_ptr(d), sshbuf_len(d), s, slen) == -1) {
108 r = SSH_ERR_INTERNAL_ERROR;
112 for (i = 0; s[i] != '\0'; i++) {
113 if ((r = sshbuf_put_u8(b64, s[i])) != 0)
115 if (i % 70 == 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
118 if ((i - 1) % 70 != 69 && (r = sshbuf_put_u8(b64, '\n')) != 0)
121 if ((r = sshbuf_put(b64, s, strlen(s))) != 0)
132 sshbuf_dtob64_string(const struct sshbuf *buf, int wrap)
137 if ((tmp = sshbuf_new()) == NULL)
139 if (sshbuf_dtob64(buf, tmp, wrap) != 0) {
143 ret = sshbuf_dup_string(tmp);
149 sshbuf_b64tod(struct sshbuf *buf, const char *b64)
151 size_t plen = strlen(b64);
157 if ((p = malloc(plen)) == NULL)
158 return SSH_ERR_ALLOC_FAIL;
159 if ((nlen = b64_pton(b64, p, plen)) < 0) {
161 return SSH_ERR_INVALID_FORMAT;
163 if ((r = sshbuf_put(buf, p, nlen)) < 0) {
172 sshbuf_dtourlb64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
174 int r = SSH_ERR_INTERNAL_ERROR;
176 struct sshbuf *b = NULL;
179 if ((b = sshbuf_new()) == NULL)
180 return SSH_ERR_ALLOC_FAIL;
181 /* Encode using regular base64; we'll transform it once done */
182 if ((r = sshbuf_dtob64(d, b, wrap)) != 0)
184 /* remove padding from end of encoded string*/
187 if (l <= 1 || sshbuf_ptr(b) == NULL) {
188 r = SSH_ERR_INTERNAL_ERROR;
191 if (sshbuf_ptr(b)[l - 1] != '=')
193 if ((r = sshbuf_consume_end(b, 1)) != 0)
196 /* Replace characters with rfc4648 equivalents */
198 if ((p = sshbuf_mutable_ptr(b)) == NULL) {
199 r = SSH_ERR_INTERNAL_ERROR;
202 for (i = 0; i < l; i++) {
205 else if (p[i] == '/')
208 r = sshbuf_putb(b64, b);
215 sshbuf_dup_string(struct sshbuf *buf)
217 const u_char *p = NULL, *s = sshbuf_ptr(buf);
218 size_t l = sshbuf_len(buf);
221 if (s == NULL || l > SIZE_MAX)
223 /* accept a nul only as the last character in the buffer */
224 if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
227 l--; /* the nul is put back below */
229 if ((r = malloc(l + 1)) == NULL)
238 sshbuf_cmp(const struct sshbuf *b, size_t offset,
239 const void *s, size_t len)
241 if (sshbuf_ptr(b) == NULL)
242 return SSH_ERR_INTERNAL_ERROR;
243 if (offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
244 return SSH_ERR_INVALID_ARGUMENT;
245 if (offset + len > sshbuf_len(b))
246 return SSH_ERR_MESSAGE_INCOMPLETE;
247 if (timingsafe_bcmp(sshbuf_ptr(b) + offset, s, len) != 0)
248 return SSH_ERR_INVALID_FORMAT;
253 sshbuf_find(const struct sshbuf *b, size_t start_offset,
254 const void *s, size_t len, size_t *offsetp)
260 if (sshbuf_ptr(b) == NULL)
261 return SSH_ERR_INTERNAL_ERROR;
262 if (start_offset > SSHBUF_SIZE_MAX || len > SSHBUF_SIZE_MAX || len == 0)
263 return SSH_ERR_INVALID_ARGUMENT;
264 if (start_offset > sshbuf_len(b) || start_offset + len > sshbuf_len(b))
265 return SSH_ERR_MESSAGE_INCOMPLETE;
266 if ((p = memmem(sshbuf_ptr(b) + start_offset,
267 sshbuf_len(b) - start_offset, s, len)) == NULL)
268 return SSH_ERR_INVALID_FORMAT;
270 *offsetp = (const u_char *)p - sshbuf_ptr(b);
275 sshbuf_read(int fd, struct sshbuf *buf, size_t maxlen, size_t *rlen)
284 if ((r = sshbuf_reserve(buf, maxlen, &d)) != 0)
286 rr = read(fd, d, maxlen);
289 /* Adjust the buffer to include only what was actually read */
290 if ((adjust = maxlen - (rr > 0 ? rr : 0)) != 0) {
291 if ((r = sshbuf_consume_end(buf, adjust)) != 0) {
292 /* avoid returning uninitialised data to caller */
293 memset(d + rr, '\0', adjust);
294 return SSH_ERR_INTERNAL_ERROR; /* shouldn't happen */
299 return SSH_ERR_SYSTEM_ERROR;
300 } else if (rr == 0) {
302 return SSH_ERR_SYSTEM_ERROR;