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4fe2af09 | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * 3. All advertising materials mentioning features or use of this software | |
13 | * must display the following acknowledgement: | |
14 | * This product includes software developed by Markus Friedl. | |
15 | * 4. The name of the author may not be used to endorse or promote products | |
16 | * derived from this software without specific prior written permission. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
29 | /* | |
30 | * read_bignum(): | |
31 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
32 | */ | |
33 | ||
34 | #include "includes.h" | |
35484284 | 35 | #include "ssh.h" |
4fe2af09 | 36 | #include <openssl/rsa.h> |
37 | #include <openssl/dsa.h> | |
38 | #include <openssl/evp.h> | |
4fe2af09 | 39 | #include "xmalloc.h" |
40 | #include "key.h" | |
a306f2dd | 41 | #include "dsa.h" |
42 | #include "uuencode.h" | |
43 | ||
44 | #define SSH_DSS "ssh-dss" | |
4fe2af09 | 45 | |
46 | Key * | |
47 | key_new(int type) | |
48 | { | |
49 | Key *k; | |
50 | RSA *rsa; | |
51 | DSA *dsa; | |
52 | k = xmalloc(sizeof(*k)); | |
53 | k->type = type; | |
a306f2dd | 54 | k->dsa = NULL; |
55 | k->rsa = NULL; | |
4fe2af09 | 56 | switch (k->type) { |
57 | case KEY_RSA: | |
58 | rsa = RSA_new(); | |
59 | rsa->n = BN_new(); | |
60 | rsa->e = BN_new(); | |
61 | k->rsa = rsa; | |
62 | break; | |
63 | case KEY_DSA: | |
64 | dsa = DSA_new(); | |
65 | dsa->p = BN_new(); | |
66 | dsa->q = BN_new(); | |
67 | dsa->g = BN_new(); | |
68 | dsa->pub_key = BN_new(); | |
69 | k->dsa = dsa; | |
70 | break; | |
71 | case KEY_EMPTY: | |
4fe2af09 | 72 | break; |
73 | default: | |
74 | fatal("key_new: bad key type %d", k->type); | |
75 | break; | |
76 | } | |
77 | return k; | |
78 | } | |
79 | void | |
80 | key_free(Key *k) | |
81 | { | |
82 | switch (k->type) { | |
83 | case KEY_RSA: | |
84 | if (k->rsa != NULL) | |
85 | RSA_free(k->rsa); | |
86 | k->rsa = NULL; | |
87 | break; | |
88 | case KEY_DSA: | |
89 | if (k->dsa != NULL) | |
90 | DSA_free(k->dsa); | |
91 | k->dsa = NULL; | |
92 | break; | |
93 | default: | |
94 | fatal("key_free: bad key type %d", k->type); | |
95 | break; | |
96 | } | |
97 | xfree(k); | |
98 | } | |
99 | int | |
100 | key_equal(Key *a, Key *b) | |
101 | { | |
102 | if (a == NULL || b == NULL || a->type != b->type) | |
103 | return 0; | |
104 | switch (a->type) { | |
105 | case KEY_RSA: | |
106 | return a->rsa != NULL && b->rsa != NULL && | |
107 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
108 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
109 | break; | |
110 | case KEY_DSA: | |
111 | return a->dsa != NULL && b->dsa != NULL && | |
112 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
113 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
114 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
115 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
116 | break; | |
117 | default: | |
a306f2dd | 118 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 119 | break; |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
124 | #define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x" | |
125 | ||
126 | /* | |
127 | * Generate key fingerprint in ascii format. | |
128 | * Based on ideas and code from Bjoern Groenvall <bg@sics.se> | |
129 | */ | |
130 | char * | |
131 | key_fingerprint(Key *k) | |
132 | { | |
133 | static char retval[80]; | |
a306f2dd | 134 | unsigned char *blob = NULL; |
4fe2af09 | 135 | int len = 0; |
a306f2dd | 136 | int nlen, elen; |
4fe2af09 | 137 | |
138 | switch (k->type) { | |
139 | case KEY_RSA: | |
140 | nlen = BN_num_bytes(k->rsa->n); | |
141 | elen = BN_num_bytes(k->rsa->e); | |
142 | len = nlen + elen; | |
a306f2dd | 143 | blob = xmalloc(len); |
144 | BN_bn2bin(k->rsa->n, blob); | |
145 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 146 | break; |
147 | case KEY_DSA: | |
a306f2dd | 148 | dsa_make_key_blob(k, &blob, &len); |
4fe2af09 | 149 | break; |
150 | default: | |
151 | fatal("key_fingerprint: bad key type %d", k->type); | |
152 | break; | |
153 | } | |
a306f2dd | 154 | if (blob != NULL) { |
4fe2af09 | 155 | unsigned char d[16]; |
156 | EVP_MD_CTX md; | |
157 | EVP_DigestInit(&md, EVP_md5()); | |
a306f2dd | 158 | EVP_DigestUpdate(&md, blob, len); |
4fe2af09 | 159 | EVP_DigestFinal(&md, d, NULL); |
160 | snprintf(retval, sizeof(retval), FPRINT, | |
161 | d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], | |
162 | d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); | |
a306f2dd | 163 | memset(blob, 0, len); |
164 | xfree(blob); | |
4fe2af09 | 165 | } |
166 | return retval; | |
167 | } | |
168 | ||
169 | /* | |
170 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
171 | * the pointer. The integer must already be initialized. This function is | |
172 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
173 | * last processed (and maybe modified) character. Note that this may modify | |
174 | * the buffer containing the number. | |
175 | */ | |
176 | int | |
177 | read_bignum(char **cpp, BIGNUM * value) | |
178 | { | |
179 | char *cp = *cpp; | |
180 | int old; | |
181 | ||
182 | /* Skip any leading whitespace. */ | |
183 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
184 | ; | |
185 | ||
186 | /* Check that it begins with a decimal digit. */ | |
187 | if (*cp < '0' || *cp > '9') | |
188 | return 0; | |
189 | ||
190 | /* Save starting position. */ | |
191 | *cpp = cp; | |
192 | ||
193 | /* Move forward until all decimal digits skipped. */ | |
194 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
195 | ; | |
196 | ||
197 | /* Save the old terminating character, and replace it by \0. */ | |
198 | old = *cp; | |
199 | *cp = 0; | |
200 | ||
201 | /* Parse the number. */ | |
202 | if (BN_dec2bn(&value, *cpp) == 0) | |
203 | return 0; | |
204 | ||
205 | /* Restore old terminating character. */ | |
206 | *cp = old; | |
207 | ||
208 | /* Move beyond the number and return success. */ | |
209 | *cpp = cp; | |
210 | return 1; | |
211 | } | |
212 | int | |
213 | write_bignum(FILE *f, BIGNUM *num) | |
214 | { | |
215 | char *buf = BN_bn2dec(num); | |
216 | if (buf == NULL) { | |
217 | error("write_bignum: BN_bn2dec() failed"); | |
218 | return 0; | |
219 | } | |
220 | fprintf(f, " %s", buf); | |
221 | free(buf); | |
222 | return 1; | |
223 | } | |
a306f2dd | 224 | unsigned int |
225 | key_read(Key *ret, char **cpp) | |
4fe2af09 | 226 | { |
a306f2dd | 227 | Key *k; |
228 | unsigned int bits = 0; | |
229 | char *cp; | |
230 | int len, n; | |
231 | unsigned char *blob; | |
232 | ||
233 | cp = *cpp; | |
234 | ||
4fe2af09 | 235 | switch(ret->type) { |
236 | case KEY_RSA: | |
a306f2dd | 237 | /* Get number of bits. */ |
238 | if (*cp < '0' || *cp > '9') | |
239 | return 0; /* Bad bit count... */ | |
240 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) | |
241 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 242 | if (bits == 0) |
243 | return 0; | |
a306f2dd | 244 | *cpp = cp; |
4fe2af09 | 245 | /* Get public exponent, public modulus. */ |
246 | if (!read_bignum(cpp, ret->rsa->e)) | |
247 | return 0; | |
248 | if (!read_bignum(cpp, ret->rsa->n)) | |
249 | return 0; | |
250 | break; | |
251 | case KEY_DSA: | |
a306f2dd | 252 | if (strncmp(cp, SSH_DSS " ", 7) != 0) |
4fe2af09 | 253 | return 0; |
a306f2dd | 254 | cp += 7; |
255 | len = 2*strlen(cp); | |
256 | blob = xmalloc(len); | |
257 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 258 | if (n < 0) { |
259 | error("uudecode %s failed", cp); | |
260 | return 0; | |
261 | } | |
a306f2dd | 262 | k = dsa_key_from_blob(blob, n); |
263 | if (k == NULL) | |
264 | return 0; | |
265 | xfree(blob); | |
266 | if (ret->dsa != NULL) | |
267 | DSA_free(ret->dsa); | |
268 | ret->dsa = k->dsa; | |
269 | k->dsa = NULL; | |
270 | key_free(k); | |
271 | bits = BN_num_bits(ret->dsa->p); | |
272 | cp = strchr(cp, '='); | |
273 | if (cp == NULL) | |
4fe2af09 | 274 | return 0; |
a306f2dd | 275 | *cpp = cp + 1; |
4fe2af09 | 276 | break; |
277 | default: | |
a306f2dd | 278 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 279 | break; |
280 | } | |
a306f2dd | 281 | return bits; |
4fe2af09 | 282 | } |
283 | int | |
284 | key_write(Key *key, FILE *f) | |
285 | { | |
286 | int success = 0; | |
287 | unsigned int bits = 0; | |
288 | ||
289 | if (key->type == KEY_RSA && key->rsa != NULL) { | |
290 | /* size of modulus 'n' */ | |
291 | bits = BN_num_bits(key->rsa->n); | |
292 | fprintf(f, "%u", bits); | |
293 | if (write_bignum(f, key->rsa->e) && | |
294 | write_bignum(f, key->rsa->n)) { | |
295 | success = 1; | |
296 | } else { | |
297 | error("key_write: failed for RSA key"); | |
298 | } | |
299 | } else if (key->type == KEY_DSA && key->dsa != NULL) { | |
a306f2dd | 300 | int len, n; |
301 | unsigned char *blob, *uu; | |
302 | dsa_make_key_blob(key, &blob, &len); | |
303 | uu = xmalloc(2*len); | |
1d1ffb87 | 304 | n = uuencode(blob, len, uu, 2*len); |
305 | if (n > 0) { | |
306 | fprintf(f, "%s %s", SSH_DSS, uu); | |
307 | success = 1; | |
308 | } | |
a306f2dd | 309 | xfree(blob); |
310 | xfree(uu); | |
4fe2af09 | 311 | } |
312 | return success; | |
313 | } | |
1d1ffb87 | 314 | char * |
315 | key_type(Key *k) | |
316 | { | |
317 | switch (k->type) { | |
318 | case KEY_RSA: | |
319 | return "RSA"; | |
320 | break; | |
321 | case KEY_DSA: | |
322 | return "DSA"; | |
323 | break; | |
324 | } | |
325 | return "unknown"; | |
326 | } |