xref: /openssh-portable/sshbuf-misc.c (revision 1a31d02b)
1 /*	$OpenBSD: sshbuf-misc.c,v 1.6 2016/05/02 08:49:03 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 #include "includes.h"
19 
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <netinet/in.h>
23 #include <errno.h>
24 #include <stdlib.h>
25 #ifdef HAVE_STDINT_H
26 #include <stdint.h>
27 #endif
28 #include <stdio.h>
29 #include <limits.h>
30 #include <string.h>
31 #include <resolv.h>
32 #include <ctype.h>
33 
34 #include "ssherr.h"
35 #define SSHBUF_INTERNAL
36 #include "sshbuf.h"
37 
38 void
39 sshbuf_dump_data(const void *s, size_t len, FILE *f)
40 {
41 	size_t i, j;
42 	const u_char *p = (const u_char *)s;
43 
44 	for (i = 0; i < len; i += 16) {
45 		fprintf(f, "%.4zu: ", i);
46 		for (j = i; j < i + 16; j++) {
47 			if (j < len)
48 				fprintf(f, "%02x ", p[j]);
49 			else
50 				fprintf(f, "   ");
51 		}
52 		fprintf(f, " ");
53 		for (j = i; j < i + 16; j++) {
54 			if (j < len) {
55 				if  (isascii(p[j]) && isprint(p[j]))
56 					fprintf(f, "%c", p[j]);
57 				else
58 					fprintf(f, ".");
59 			}
60 		}
61 		fprintf(f, "\n");
62 	}
63 }
64 
65 void
66 sshbuf_dump(struct sshbuf *buf, FILE *f)
67 {
68 	fprintf(f, "buffer %p len = %zu\n", buf, sshbuf_len(buf));
69 	sshbuf_dump_data(sshbuf_ptr(buf), sshbuf_len(buf), f);
70 }
71 
72 char *
73 sshbuf_dtob16(struct sshbuf *buf)
74 {
75 	size_t i, j, len = sshbuf_len(buf);
76 	const u_char *p = sshbuf_ptr(buf);
77 	char *ret;
78 	const char hex[] = "0123456789abcdef";
79 
80 	if (len == 0)
81 		return strdup("");
82 	if (SIZE_MAX / 2 <= len || (ret = malloc(len * 2 + 1)) == NULL)
83 		return NULL;
84 	for (i = j = 0; i < len; i++) {
85 		ret[j++] = hex[(p[i] >> 4) & 0xf];
86 		ret[j++] = hex[p[i] & 0xf];
87 	}
88 	ret[j] = '\0';
89 	return ret;
90 }
91 
92 char *
93 sshbuf_dtob64(struct sshbuf *buf)
94 {
95 	size_t len = sshbuf_len(buf), plen;
96 	const u_char *p = sshbuf_ptr(buf);
97 	char *ret;
98 	int r;
99 
100 	if (len == 0)
101 		return strdup("");
102 	plen = ((len + 2) / 3) * 4 + 1;
103 	if (SIZE_MAX / 2 <= len || (ret = malloc(plen)) == NULL)
104 		return NULL;
105 	if ((r = b64_ntop(p, len, ret, plen)) == -1) {
106 		explicit_bzero(ret, plen);
107 		free(ret);
108 		return NULL;
109 	}
110 	return ret;
111 }
112 
113 int
114 sshbuf_b64tod(struct sshbuf *buf, const char *b64)
115 {
116 	size_t plen = strlen(b64);
117 	int nlen, r;
118 	u_char *p;
119 
120 	if (plen == 0)
121 		return 0;
122 	if ((p = malloc(plen)) == NULL)
123 		return SSH_ERR_ALLOC_FAIL;
124 	if ((nlen = b64_pton(b64, p, plen)) < 0) {
125 		explicit_bzero(p, plen);
126 		free(p);
127 		return SSH_ERR_INVALID_FORMAT;
128 	}
129 	if ((r = sshbuf_put(buf, p, nlen)) < 0) {
130 		explicit_bzero(p, plen);
131 		free(p);
132 		return r;
133 	}
134 	explicit_bzero(p, plen);
135 	free(p);
136 	return 0;
137 }
138 
139 char *
140 sshbuf_dup_string(struct sshbuf *buf)
141 {
142 	const u_char *p = NULL, *s = sshbuf_ptr(buf);
143 	size_t l = sshbuf_len(buf);
144 	char *r;
145 
146 	if (s == NULL || l > SIZE_MAX)
147 		return NULL;
148 	/* accept a nul only as the last character in the buffer */
149 	if (l > 0 && (p = memchr(s, '\0', l)) != NULL) {
150 		if (p != s + l - 1)
151 			return NULL;
152 		l--; /* the nul is put back below */
153 	}
154 	if ((r = malloc(l + 1)) == NULL)
155 		return NULL;
156 	if (l > 0)
157 		memcpy(r, s, l);
158 	r[l] = '\0';
159 	return r;
160 }
161 
162