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208cc0ee | 1 | /* $OpenBSD: key.c,v 1.73 2008/06/12 00:13:13 otto Exp $ */ |
4fe2af09 | 2 | /* |
bcbf86ec | 3 | * read_bignum(): |
4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * | |
6 | * As far as I am concerned, the code I have written for this software | |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
12 | * | |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
4fe2af09 | 14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
4fe2af09 | 23 | * |
24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
31652869 | 35 | |
4fe2af09 | 36 | #include "includes.h" |
42f11eb2 | 37 | |
aff73c5f | 38 | #include <sys/param.h> |
31652869 | 39 | #include <sys/types.h> |
40 | ||
4fe2af09 | 41 | #include <openssl/evp.h> |
6e013118 | 42 | #include <openbsd-compat/openssl-compat.h> |
42f11eb2 | 43 | |
24436b92 | 44 | #include <stdarg.h> |
cf851879 | 45 | #include <stdio.h> |
00146caa | 46 | #include <string.h> |
47 | ||
4fe2af09 | 48 | #include "xmalloc.h" |
49 | #include "key.h" | |
fa08c86b | 50 | #include "rsa.h" |
a306f2dd | 51 | #include "uuencode.h" |
fa08c86b | 52 | #include "buffer.h" |
42f11eb2 | 53 | #include "log.h" |
4fe2af09 | 54 | |
55 | Key * | |
56 | key_new(int type) | |
57 | { | |
58 | Key *k; | |
59 | RSA *rsa; | |
60 | DSA *dsa; | |
52e3daed | 61 | k = xcalloc(1, sizeof(*k)); |
4fe2af09 | 62 | k->type = type; |
a306f2dd | 63 | k->dsa = NULL; |
64 | k->rsa = NULL; | |
4fe2af09 | 65 | switch (k->type) { |
fa08c86b | 66 | case KEY_RSA1: |
4fe2af09 | 67 | case KEY_RSA: |
b775c6f2 | 68 | if ((rsa = RSA_new()) == NULL) |
69 | fatal("key_new: RSA_new failed"); | |
70 | if ((rsa->n = BN_new()) == NULL) | |
71 | fatal("key_new: BN_new failed"); | |
72 | if ((rsa->e = BN_new()) == NULL) | |
73 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 74 | k->rsa = rsa; |
75 | break; | |
76 | case KEY_DSA: | |
b775c6f2 | 77 | if ((dsa = DSA_new()) == NULL) |
78 | fatal("key_new: DSA_new failed"); | |
79 | if ((dsa->p = BN_new()) == NULL) | |
80 | fatal("key_new: BN_new failed"); | |
81 | if ((dsa->q = BN_new()) == NULL) | |
82 | fatal("key_new: BN_new failed"); | |
83 | if ((dsa->g = BN_new()) == NULL) | |
84 | fatal("key_new: BN_new failed"); | |
85 | if ((dsa->pub_key = BN_new()) == NULL) | |
86 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 87 | k->dsa = dsa; |
88 | break; | |
fa08c86b | 89 | case KEY_UNSPEC: |
4fe2af09 | 90 | break; |
91 | default: | |
92 | fatal("key_new: bad key type %d", k->type); | |
93 | break; | |
94 | } | |
95 | return k; | |
96 | } | |
3ddc795d | 97 | |
fa08c86b | 98 | Key * |
99 | key_new_private(int type) | |
100 | { | |
101 | Key *k = key_new(type); | |
102 | switch (k->type) { | |
103 | case KEY_RSA1: | |
104 | case KEY_RSA: | |
b775c6f2 | 105 | if ((k->rsa->d = BN_new()) == NULL) |
106 | fatal("key_new_private: BN_new failed"); | |
107 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
108 | fatal("key_new_private: BN_new failed"); | |
109 | if ((k->rsa->q = BN_new()) == NULL) | |
110 | fatal("key_new_private: BN_new failed"); | |
111 | if ((k->rsa->p = BN_new()) == NULL) | |
112 | fatal("key_new_private: BN_new failed"); | |
113 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
114 | fatal("key_new_private: BN_new failed"); | |
115 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
116 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 117 | break; |
118 | case KEY_DSA: | |
b775c6f2 | 119 | if ((k->dsa->priv_key = BN_new()) == NULL) |
120 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 121 | break; |
122 | case KEY_UNSPEC: | |
123 | break; | |
124 | default: | |
125 | break; | |
126 | } | |
127 | return k; | |
128 | } | |
3ddc795d | 129 | |
4fe2af09 | 130 | void |
131 | key_free(Key *k) | |
132 | { | |
7016f7cf | 133 | if (k == NULL) |
353d48db | 134 | fatal("key_free: key is NULL"); |
4fe2af09 | 135 | switch (k->type) { |
fa08c86b | 136 | case KEY_RSA1: |
4fe2af09 | 137 | case KEY_RSA: |
138 | if (k->rsa != NULL) | |
139 | RSA_free(k->rsa); | |
140 | k->rsa = NULL; | |
141 | break; | |
142 | case KEY_DSA: | |
143 | if (k->dsa != NULL) | |
144 | DSA_free(k->dsa); | |
145 | k->dsa = NULL; | |
146 | break; | |
fa08c86b | 147 | case KEY_UNSPEC: |
148 | break; | |
4fe2af09 | 149 | default: |
150 | fatal("key_free: bad key type %d", k->type); | |
151 | break; | |
152 | } | |
153 | xfree(k); | |
154 | } | |
b6c7b7b7 | 155 | |
4fe2af09 | 156 | int |
b6c7b7b7 | 157 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 158 | { |
159 | if (a == NULL || b == NULL || a->type != b->type) | |
160 | return 0; | |
161 | switch (a->type) { | |
fa08c86b | 162 | case KEY_RSA1: |
4fe2af09 | 163 | case KEY_RSA: |
164 | return a->rsa != NULL && b->rsa != NULL && | |
165 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
166 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
4fe2af09 | 167 | case KEY_DSA: |
168 | return a->dsa != NULL && b->dsa != NULL && | |
169 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
170 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
171 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
172 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
4fe2af09 | 173 | default: |
a306f2dd | 174 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 175 | } |
4fe2af09 | 176 | } |
177 | ||
21289cd0 | 178 | u_char* |
b6c7b7b7 | 179 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
180 | u_int *dgst_raw_length) | |
4fe2af09 | 181 | { |
714954dc | 182 | const EVP_MD *md = NULL; |
79c9ac1b | 183 | EVP_MD_CTX ctx; |
1e3b8b07 | 184 | u_char *blob = NULL; |
301e8e5b | 185 | u_char *retval = NULL; |
c66f9d0e | 186 | u_int len = 0; |
a306f2dd | 187 | int nlen, elen; |
4fe2af09 | 188 | |
301e8e5b | 189 | *dgst_raw_length = 0; |
190 | ||
79c9ac1b | 191 | switch (dgst_type) { |
192 | case SSH_FP_MD5: | |
193 | md = EVP_md5(); | |
194 | break; | |
195 | case SSH_FP_SHA1: | |
196 | md = EVP_sha1(); | |
197 | break; | |
198 | default: | |
199 | fatal("key_fingerprint_raw: bad digest type %d", | |
200 | dgst_type); | |
201 | } | |
4fe2af09 | 202 | switch (k->type) { |
fa08c86b | 203 | case KEY_RSA1: |
4fe2af09 | 204 | nlen = BN_num_bytes(k->rsa->n); |
205 | elen = BN_num_bytes(k->rsa->e); | |
206 | len = nlen + elen; | |
a306f2dd | 207 | blob = xmalloc(len); |
208 | BN_bn2bin(k->rsa->n, blob); | |
209 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 210 | break; |
211 | case KEY_DSA: | |
fa08c86b | 212 | case KEY_RSA: |
213 | key_to_blob(k, &blob, &len); | |
214 | break; | |
215 | case KEY_UNSPEC: | |
216 | return retval; | |
4fe2af09 | 217 | default: |
301e8e5b | 218 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 219 | break; |
220 | } | |
a306f2dd | 221 | if (blob != NULL) { |
301e8e5b | 222 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 223 | EVP_DigestInit(&ctx, md); |
224 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 225 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 226 | memset(blob, 0, len); |
227 | xfree(blob); | |
301e8e5b | 228 | } else { |
229 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 230 | } |
231 | return retval; | |
232 | } | |
233 | ||
343288b8 | 234 | static char * |
235 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 236 | { |
237 | char *retval; | |
2ceb8101 | 238 | u_int i; |
301e8e5b | 239 | |
52e3daed | 240 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
184eed6a | 241 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 242 | char hex[4]; |
243 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 244 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 245 | } |
956b0f56 | 246 | |
247 | /* Remove the trailing ':' character */ | |
301e8e5b | 248 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
249 | return retval; | |
250 | } | |
251 | ||
343288b8 | 252 | static char * |
253 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 254 | { |
255 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
256 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
257 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 258 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 259 | char *retval; |
260 | ||
261 | rounds = (dgst_raw_len / 2) + 1; | |
52e3daed | 262 | retval = xcalloc((rounds * 6), sizeof(char)); |
08345971 | 263 | retval[j++] = 'x'; |
264 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 265 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 266 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
267 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 268 | seed) % 6; |
08345971 | 269 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
270 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 271 | (seed / 6)) % 6; |
08345971 | 272 | retval[j++] = vowels[idx0]; |
273 | retval[j++] = consonants[idx1]; | |
274 | retval[j++] = vowels[idx2]; | |
275 | if ((i + 1) < rounds) { | |
276 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
277 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
278 | retval[j++] = consonants[idx3]; | |
279 | retval[j++] = '-'; | |
280 | retval[j++] = consonants[idx4]; | |
301e8e5b | 281 | seed = ((seed * 5) + |
08345971 | 282 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
283 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 284 | } |
285 | } else { | |
286 | idx0 = seed % 6; | |
287 | idx1 = 16; | |
288 | idx2 = seed / 6; | |
08345971 | 289 | retval[j++] = vowels[idx0]; |
290 | retval[j++] = consonants[idx1]; | |
291 | retval[j++] = vowels[idx2]; | |
301e8e5b | 292 | } |
293 | } | |
08345971 | 294 | retval[j++] = 'x'; |
295 | retval[j++] = '\0'; | |
301e8e5b | 296 | return retval; |
297 | } | |
298 | ||
aff73c5f | 299 | /* |
300 | * Draw an ASCII-Art representing the fingerprint so human brain can | |
301 | * profit from its built-in pattern recognition ability. | |
302 | * This technique is called "random art" and can be found in some | |
303 | * scientific publications like this original paper: | |
304 | * | |
305 | * "Hash Visualization: a New Technique to improve Real-World Security", | |
306 | * Perrig A. and Song D., 1999, International Workshop on Cryptographic | |
307 | * Techniques and E-Commerce (CrypTEC '99) | |
308 | * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf | |
309 | * | |
310 | * The subject came up in a talk by Dan Kaminsky, too. | |
311 | * | |
312 | * If you see the picture is different, the key is different. | |
313 | * If the picture looks the same, you still know nothing. | |
314 | * | |
315 | * The algorithm used here is a worm crawling over a discrete plane, | |
316 | * leaving a trace (augmenting the field) everywhere it goes. | |
317 | * Movement is taken from dgst_raw 2bit-wise. Bumping into walls | |
318 | * makes the respective movement vector be ignored for this turn. | |
319 | * Graphs are not unambiguous, because circles in graphs can be | |
320 | * walked in either direction. | |
321 | */ | |
208cc0ee | 322 | #define FLDSIZE_Y (8 + 1) |
323 | #define FLDSIZE_X (8 * 2 + 1) | |
aff73c5f | 324 | static char * |
325 | key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len) | |
326 | { | |
327 | /* | |
328 | * Chars to be used after each other every time the worm | |
329 | * intersects with itself. Matter of taste. | |
330 | */ | |
208cc0ee | 331 | char *augmentation_string = " .o+=*BOX@%&#/^S"; |
aff73c5f | 332 | char *retval, *p; |
e3115002 | 333 | u_char field[FLDSIZE_X][FLDSIZE_Y]; |
aff73c5f | 334 | u_int i, b; |
335 | int x, y; | |
97841001 | 336 | size_t len = strlen(augmentation_string) - 1; |
aff73c5f | 337 | |
338 | retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2)); | |
339 | ||
340 | /* initialize field */ | |
e3115002 | 341 | memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
aff73c5f | 342 | x = FLDSIZE_X / 2; |
343 | y = FLDSIZE_Y / 2; | |
aff73c5f | 344 | |
345 | /* process raw key */ | |
346 | for (i = 0; i < dgst_raw_len; i++) { | |
347 | int input; | |
348 | /* each byte conveys four 2-bit move commands */ | |
349 | input = dgst_raw[i]; | |
350 | for (b = 0; b < 4; b++) { | |
351 | /* evaluate 2 bit, rest is shifted later */ | |
352 | x += (input & 0x1) ? 1 : -1; | |
353 | y += (input & 0x2) ? 1 : -1; | |
354 | ||
355 | /* assure we are still in bounds */ | |
356 | x = MAX(x, 0); | |
357 | y = MAX(y, 0); | |
358 | x = MIN(x, FLDSIZE_X - 1); | |
359 | y = MIN(y, FLDSIZE_Y - 1); | |
360 | ||
361 | /* augment the field */ | |
e3115002 | 362 | field[x][y]++; |
aff73c5f | 363 | input = input >> 2; |
364 | } | |
365 | } | |
208cc0ee | 366 | field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len; |
aff73c5f | 367 | |
368 | /* fill in retval */ | |
369 | p = retval; | |
370 | ||
371 | /* output upper border */ | |
372 | *p++ = '+'; | |
373 | for (i = 0; i < FLDSIZE_X; i++) | |
374 | *p++ = '-'; | |
375 | *p++ = '+'; | |
376 | *p++ = '\n'; | |
377 | ||
378 | /* output content */ | |
379 | for (y = 0; y < FLDSIZE_Y; y++) { | |
380 | *p++ = '|'; | |
381 | for (x = 0; x < FLDSIZE_X; x++) | |
97841001 | 382 | *p++ = augmentation_string[MIN(field[x][y], len)]; |
aff73c5f | 383 | *p++ = '|'; |
384 | *p++ = '\n'; | |
385 | } | |
386 | ||
387 | /* output lower border */ | |
388 | *p++ = '+'; | |
389 | for (i = 0; i < FLDSIZE_X; i++) | |
390 | *p++ = '-'; | |
391 | *p++ = '+'; | |
392 | ||
393 | return retval; | |
394 | } | |
395 | ||
343288b8 | 396 | char * |
b6c7b7b7 | 397 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 398 | { |
cd332296 | 399 | char *retval = NULL; |
301e8e5b | 400 | u_char *dgst_raw; |
a209a158 | 401 | u_int dgst_raw_len; |
184eed6a | 402 | |
301e8e5b | 403 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
404 | if (!dgst_raw) | |
22138a36 | 405 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 406 | switch (dgst_rep) { |
301e8e5b | 407 | case SSH_FP_HEX: |
408 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
409 | break; | |
410 | case SSH_FP_BUBBLEBABBLE: | |
411 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
412 | break; | |
aff73c5f | 413 | case SSH_FP_RANDOMART: |
414 | retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len); | |
415 | break; | |
301e8e5b | 416 | default: |
417 | fatal("key_fingerprint_ex: bad digest representation %d", | |
418 | dgst_rep); | |
419 | break; | |
420 | } | |
421 | memset(dgst_raw, 0, dgst_raw_len); | |
422 | xfree(dgst_raw); | |
423 | return retval; | |
424 | } | |
425 | ||
4fe2af09 | 426 | /* |
427 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
428 | * the pointer. The integer must already be initialized. This function is | |
429 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
430 | * last processed (and maybe modified) character. Note that this may modify | |
431 | * the buffer containing the number. | |
432 | */ | |
396c147e | 433 | static int |
4fe2af09 | 434 | read_bignum(char **cpp, BIGNUM * value) |
435 | { | |
436 | char *cp = *cpp; | |
437 | int old; | |
438 | ||
439 | /* Skip any leading whitespace. */ | |
440 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
441 | ; | |
442 | ||
443 | /* Check that it begins with a decimal digit. */ | |
444 | if (*cp < '0' || *cp > '9') | |
445 | return 0; | |
446 | ||
447 | /* Save starting position. */ | |
448 | *cpp = cp; | |
449 | ||
450 | /* Move forward until all decimal digits skipped. */ | |
451 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
452 | ; | |
453 | ||
454 | /* Save the old terminating character, and replace it by \0. */ | |
455 | old = *cp; | |
456 | *cp = 0; | |
457 | ||
458 | /* Parse the number. */ | |
459 | if (BN_dec2bn(&value, *cpp) == 0) | |
460 | return 0; | |
461 | ||
462 | /* Restore old terminating character. */ | |
463 | *cp = old; | |
464 | ||
465 | /* Move beyond the number and return success. */ | |
466 | *cpp = cp; | |
467 | return 1; | |
468 | } | |
3ddc795d | 469 | |
396c147e | 470 | static int |
4fe2af09 | 471 | write_bignum(FILE *f, BIGNUM *num) |
472 | { | |
473 | char *buf = BN_bn2dec(num); | |
474 | if (buf == NULL) { | |
475 | error("write_bignum: BN_bn2dec() failed"); | |
476 | return 0; | |
477 | } | |
478 | fprintf(f, " %s", buf); | |
c48c32c1 | 479 | OPENSSL_free(buf); |
4fe2af09 | 480 | return 1; |
481 | } | |
fa08c86b | 482 | |
cb8c7bad | 483 | /* returns 1 ok, -1 error */ |
fa08c86b | 484 | int |
a306f2dd | 485 | key_read(Key *ret, char **cpp) |
4fe2af09 | 486 | { |
a306f2dd | 487 | Key *k; |
fa08c86b | 488 | int success = -1; |
489 | char *cp, *space; | |
490 | int len, n, type; | |
491 | u_int bits; | |
1e3b8b07 | 492 | u_char *blob; |
a306f2dd | 493 | |
494 | cp = *cpp; | |
495 | ||
6aacefa7 | 496 | switch (ret->type) { |
fa08c86b | 497 | case KEY_RSA1: |
a306f2dd | 498 | /* Get number of bits. */ |
499 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 500 | return -1; /* Bad bit count... */ |
a306f2dd | 501 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
502 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 503 | if (bits == 0) |
fa08c86b | 504 | return -1; |
a306f2dd | 505 | *cpp = cp; |
4fe2af09 | 506 | /* Get public exponent, public modulus. */ |
507 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 508 | return -1; |
4fe2af09 | 509 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 510 | return -1; |
511 | success = 1; | |
4fe2af09 | 512 | break; |
fa08c86b | 513 | case KEY_UNSPEC: |
514 | case KEY_RSA: | |
4fe2af09 | 515 | case KEY_DSA: |
fa08c86b | 516 | space = strchr(cp, ' '); |
517 | if (space == NULL) { | |
79cfe67c | 518 | debug3("key_read: missing whitespace"); |
fa08c86b | 519 | return -1; |
520 | } | |
521 | *space = '\0'; | |
522 | type = key_type_from_name(cp); | |
523 | *space = ' '; | |
524 | if (type == KEY_UNSPEC) { | |
79cfe67c | 525 | debug3("key_read: missing keytype"); |
fa08c86b | 526 | return -1; |
527 | } | |
528 | cp = space+1; | |
529 | if (*cp == '\0') { | |
530 | debug3("key_read: short string"); | |
531 | return -1; | |
532 | } | |
533 | if (ret->type == KEY_UNSPEC) { | |
534 | ret->type = type; | |
535 | } else if (ret->type != type) { | |
536 | /* is a key, but different type */ | |
537 | debug3("key_read: type mismatch"); | |
cb8c7bad | 538 | return -1; |
fa08c86b | 539 | } |
a306f2dd | 540 | len = 2*strlen(cp); |
541 | blob = xmalloc(len); | |
542 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 543 | if (n < 0) { |
71276795 | 544 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 545 | xfree(blob); |
fa08c86b | 546 | return -1; |
1d1ffb87 | 547 | } |
a27002e5 | 548 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 549 | xfree(blob); |
71276795 | 550 | if (k == NULL) { |
fa08c86b | 551 | error("key_read: key_from_blob %s failed", cp); |
552 | return -1; | |
71276795 | 553 | } |
fa08c86b | 554 | if (k->type != type) { |
555 | error("key_read: type mismatch: encoding error"); | |
556 | key_free(k); | |
557 | return -1; | |
558 | } | |
559 | /*XXXX*/ | |
560 | if (ret->type == KEY_RSA) { | |
561 | if (ret->rsa != NULL) | |
562 | RSA_free(ret->rsa); | |
563 | ret->rsa = k->rsa; | |
564 | k->rsa = NULL; | |
565 | success = 1; | |
566 | #ifdef DEBUG_PK | |
567 | RSA_print_fp(stderr, ret->rsa, 8); | |
568 | #endif | |
569 | } else { | |
570 | if (ret->dsa != NULL) | |
571 | DSA_free(ret->dsa); | |
572 | ret->dsa = k->dsa; | |
573 | k->dsa = NULL; | |
574 | success = 1; | |
575 | #ifdef DEBUG_PK | |
576 | DSA_print_fp(stderr, ret->dsa, 8); | |
577 | #endif | |
578 | } | |
579 | /*XXXX*/ | |
2f98d223 | 580 | key_free(k); |
fa08c86b | 581 | if (success != 1) |
582 | break; | |
71276795 | 583 | /* advance cp: skip whitespace and data */ |
584 | while (*cp == ' ' || *cp == '\t') | |
585 | cp++; | |
586 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
587 | cp++; | |
588 | *cpp = cp; | |
4fe2af09 | 589 | break; |
590 | default: | |
a306f2dd | 591 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 592 | break; |
593 | } | |
fa08c86b | 594 | return success; |
4fe2af09 | 595 | } |
3ddc795d | 596 | |
4fe2af09 | 597 | int |
b6c7b7b7 | 598 | key_write(const Key *key, FILE *f) |
4fe2af09 | 599 | { |
c66f9d0e | 600 | int n, success = 0; |
601 | u_int len, bits = 0; | |
661e45a0 | 602 | u_char *blob; |
603 | char *uu; | |
4fe2af09 | 604 | |
fa08c86b | 605 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 606 | /* size of modulus 'n' */ |
607 | bits = BN_num_bits(key->rsa->n); | |
608 | fprintf(f, "%u", bits); | |
609 | if (write_bignum(f, key->rsa->e) && | |
610 | write_bignum(f, key->rsa->n)) { | |
611 | success = 1; | |
612 | } else { | |
613 | error("key_write: failed for RSA key"); | |
614 | } | |
fa08c86b | 615 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
616 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 617 | key_to_blob(key, &blob, &len); |
a306f2dd | 618 | uu = xmalloc(2*len); |
1d1ffb87 | 619 | n = uuencode(blob, len, uu, 2*len); |
620 | if (n > 0) { | |
fa08c86b | 621 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 622 | success = 1; |
623 | } | |
a306f2dd | 624 | xfree(blob); |
625 | xfree(uu); | |
4fe2af09 | 626 | } |
627 | return success; | |
628 | } | |
3ddc795d | 629 | |
b6c7b7b7 | 630 | const char * |
631 | key_type(const Key *k) | |
1d1ffb87 | 632 | { |
633 | switch (k->type) { | |
fa08c86b | 634 | case KEY_RSA1: |
635 | return "RSA1"; | |
1d1ffb87 | 636 | case KEY_RSA: |
637 | return "RSA"; | |
1d1ffb87 | 638 | case KEY_DSA: |
639 | return "DSA"; | |
1d1ffb87 | 640 | } |
641 | return "unknown"; | |
642 | } | |
3ddc795d | 643 | |
b6c7b7b7 | 644 | const char * |
645 | key_ssh_name(const Key *k) | |
fa08c86b | 646 | { |
647 | switch (k->type) { | |
648 | case KEY_RSA: | |
649 | return "ssh-rsa"; | |
fa08c86b | 650 | case KEY_DSA: |
651 | return "ssh-dss"; | |
fa08c86b | 652 | } |
653 | return "ssh-unknown"; | |
654 | } | |
3ddc795d | 655 | |
fa08c86b | 656 | u_int |
b6c7b7b7 | 657 | key_size(const Key *k) |
6aacefa7 | 658 | { |
2e73a022 | 659 | switch (k->type) { |
fa08c86b | 660 | case KEY_RSA1: |
2e73a022 | 661 | case KEY_RSA: |
662 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 663 | case KEY_DSA: |
664 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 665 | } |
666 | return 0; | |
667 | } | |
fa08c86b | 668 | |
396c147e | 669 | static RSA * |
1e3b8b07 | 670 | rsa_generate_private_key(u_int bits) |
fa08c86b | 671 | { |
2b87da3b | 672 | RSA *private; |
5ef36928 | 673 | |
2b87da3b | 674 | private = RSA_generate_key(bits, 35, NULL, NULL); |
675 | if (private == NULL) | |
676 | fatal("rsa_generate_private_key: key generation failed."); | |
677 | return private; | |
fa08c86b | 678 | } |
679 | ||
396c147e | 680 | static DSA* |
1e3b8b07 | 681 | dsa_generate_private_key(u_int bits) |
fa08c86b | 682 | { |
683 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 684 | |
fa08c86b | 685 | if (private == NULL) |
686 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
687 | if (!DSA_generate_key(private)) | |
2b87da3b | 688 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
689 | if (private == NULL) | |
690 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 691 | return private; |
692 | } | |
693 | ||
694 | Key * | |
1e3b8b07 | 695 | key_generate(int type, u_int bits) |
fa08c86b | 696 | { |
697 | Key *k = key_new(KEY_UNSPEC); | |
698 | switch (type) { | |
2b87da3b | 699 | case KEY_DSA: |
fa08c86b | 700 | k->dsa = dsa_generate_private_key(bits); |
701 | break; | |
702 | case KEY_RSA: | |
703 | case KEY_RSA1: | |
704 | k->rsa = rsa_generate_private_key(bits); | |
705 | break; | |
706 | default: | |
2b87da3b | 707 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 708 | } |
2b87da3b | 709 | k->type = type; |
fa08c86b | 710 | return k; |
711 | } | |
712 | ||
713 | Key * | |
b6c7b7b7 | 714 | key_from_private(const Key *k) |
fa08c86b | 715 | { |
716 | Key *n = NULL; | |
717 | switch (k->type) { | |
2b87da3b | 718 | case KEY_DSA: |
fa08c86b | 719 | n = key_new(k->type); |
e516451d | 720 | if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
721 | (BN_copy(n->dsa->q, k->dsa->q) == NULL) || | |
722 | (BN_copy(n->dsa->g, k->dsa->g) == NULL) || | |
723 | (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) | |
724 | fatal("key_from_private: BN_copy failed"); | |
fa08c86b | 725 | break; |
726 | case KEY_RSA: | |
727 | case KEY_RSA1: | |
728 | n = key_new(k->type); | |
e516451d | 729 | if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
730 | (BN_copy(n->rsa->e, k->rsa->e) == NULL)) | |
731 | fatal("key_from_private: BN_copy failed"); | |
fa08c86b | 732 | break; |
733 | default: | |
2b87da3b | 734 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 735 | break; |
736 | } | |
737 | return n; | |
738 | } | |
739 | ||
740 | int | |
741 | key_type_from_name(char *name) | |
742 | { | |
6aacefa7 | 743 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 744 | return KEY_RSA1; |
6aacefa7 | 745 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 746 | return KEY_RSA; |
6aacefa7 | 747 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 748 | return KEY_DSA; |
6aacefa7 | 749 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 750 | return KEY_RSA; |
6aacefa7 | 751 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 752 | return KEY_DSA; |
753 | } | |
539af7f5 | 754 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 755 | return KEY_UNSPEC; |
756 | } | |
757 | ||
e961a8f9 | 758 | int |
759 | key_names_valid2(const char *names) | |
760 | { | |
761 | char *s, *cp, *p; | |
762 | ||
763 | if (names == NULL || strcmp(names, "") == 0) | |
764 | return 0; | |
765 | s = cp = xstrdup(names); | |
766 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 767 | (p = strsep(&cp, ","))) { |
e961a8f9 | 768 | switch (key_type_from_name(p)) { |
769 | case KEY_RSA1: | |
770 | case KEY_UNSPEC: | |
771 | xfree(s); | |
772 | return 0; | |
773 | } | |
774 | } | |
775 | debug3("key names ok: [%s]", names); | |
776 | xfree(s); | |
777 | return 1; | |
778 | } | |
779 | ||
fa08c86b | 780 | Key * |
b6c7b7b7 | 781 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 782 | { |
783 | Buffer b; | |
fa08c86b | 784 | int rlen, type; |
63488674 | 785 | char *ktype = NULL; |
fa08c86b | 786 | Key *key = NULL; |
787 | ||
788 | #ifdef DEBUG_PK | |
789 | dump_base64(stderr, blob, blen); | |
790 | #endif | |
791 | buffer_init(&b); | |
792 | buffer_append(&b, blob, blen); | |
63488674 | 793 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
794 | error("key_from_blob: can't read key type"); | |
795 | goto out; | |
796 | } | |
797 | ||
fa08c86b | 798 | type = key_type_from_name(ktype); |
799 | ||
6aacefa7 | 800 | switch (type) { |
fa08c86b | 801 | case KEY_RSA: |
802 | key = key_new(type); | |
63488674 | 803 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
804 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
805 | error("key_from_blob: can't read rsa key"); | |
806 | key_free(key); | |
807 | key = NULL; | |
808 | goto out; | |
809 | } | |
fa08c86b | 810 | #ifdef DEBUG_PK |
811 | RSA_print_fp(stderr, key->rsa, 8); | |
812 | #endif | |
813 | break; | |
814 | case KEY_DSA: | |
815 | key = key_new(type); | |
63488674 | 816 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
817 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
818 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
819 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
820 | error("key_from_blob: can't read dsa key"); | |
821 | key_free(key); | |
822 | key = NULL; | |
823 | goto out; | |
824 | } | |
fa08c86b | 825 | #ifdef DEBUG_PK |
826 | DSA_print_fp(stderr, key->dsa, 8); | |
827 | #endif | |
828 | break; | |
829 | case KEY_UNSPEC: | |
830 | key = key_new(type); | |
831 | break; | |
832 | default: | |
833 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 834 | goto out; |
fa08c86b | 835 | } |
836 | rlen = buffer_len(&b); | |
837 | if (key != NULL && rlen != 0) | |
838 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 839 | out: |
840 | if (ktype != NULL) | |
841 | xfree(ktype); | |
fa08c86b | 842 | buffer_free(&b); |
843 | return key; | |
844 | } | |
845 | ||
846 | int | |
b6c7b7b7 | 847 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 848 | { |
849 | Buffer b; | |
850 | int len; | |
fa08c86b | 851 | |
852 | if (key == NULL) { | |
853 | error("key_to_blob: key == NULL"); | |
854 | return 0; | |
855 | } | |
856 | buffer_init(&b); | |
6aacefa7 | 857 | switch (key->type) { |
fa08c86b | 858 | case KEY_DSA: |
859 | buffer_put_cstring(&b, key_ssh_name(key)); | |
860 | buffer_put_bignum2(&b, key->dsa->p); | |
861 | buffer_put_bignum2(&b, key->dsa->q); | |
862 | buffer_put_bignum2(&b, key->dsa->g); | |
863 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
864 | break; | |
865 | case KEY_RSA: | |
866 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 867 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 868 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 869 | break; |
870 | default: | |
f7436b8c | 871 | error("key_to_blob: unsupported key type %d", key->type); |
872 | buffer_free(&b); | |
873 | return 0; | |
fa08c86b | 874 | } |
875 | len = buffer_len(&b); | |
fa08c86b | 876 | if (lenp != NULL) |
877 | *lenp = len; | |
eb9f2fab | 878 | if (blobp != NULL) { |
879 | *blobp = xmalloc(len); | |
880 | memcpy(*blobp, buffer_ptr(&b), len); | |
881 | } | |
882 | memset(buffer_ptr(&b), 0, len); | |
883 | buffer_free(&b); | |
fa08c86b | 884 | return len; |
885 | } | |
886 | ||
887 | int | |
888 | key_sign( | |
b6c7b7b7 | 889 | const Key *key, |
c66f9d0e | 890 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 891 | const u_char *data, u_int datalen) |
fa08c86b | 892 | { |
6aacefa7 | 893 | switch (key->type) { |
fa08c86b | 894 | case KEY_DSA: |
895 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 896 | case KEY_RSA: |
897 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 898 | default: |
d77347cc | 899 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 900 | return -1; |
fa08c86b | 901 | } |
902 | } | |
903 | ||
3ed81c99 | 904 | /* |
905 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
906 | * and -1 on error. | |
907 | */ | |
fa08c86b | 908 | int |
909 | key_verify( | |
b6c7b7b7 | 910 | const Key *key, |
911 | const u_char *signature, u_int signaturelen, | |
912 | const u_char *data, u_int datalen) | |
fa08c86b | 913 | { |
c10d042a | 914 | if (signaturelen == 0) |
915 | return -1; | |
916 | ||
6aacefa7 | 917 | switch (key->type) { |
fa08c86b | 918 | case KEY_DSA: |
919 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 920 | case KEY_RSA: |
921 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 922 | default: |
d77347cc | 923 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 924 | return -1; |
fa08c86b | 925 | } |
926 | } | |
d0074658 | 927 | |
928 | /* Converts a private to a public key */ | |
d0074658 | 929 | Key * |
b6c7b7b7 | 930 | key_demote(const Key *k) |
d0074658 | 931 | { |
932 | Key *pk; | |
762715ce | 933 | |
52e3daed | 934 | pk = xcalloc(1, sizeof(*pk)); |
d0074658 | 935 | pk->type = k->type; |
936 | pk->flags = k->flags; | |
937 | pk->dsa = NULL; | |
938 | pk->rsa = NULL; | |
939 | ||
940 | switch (k->type) { | |
941 | case KEY_RSA1: | |
942 | case KEY_RSA: | |
943 | if ((pk->rsa = RSA_new()) == NULL) | |
944 | fatal("key_demote: RSA_new failed"); | |
945 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
946 | fatal("key_demote: BN_dup failed"); | |
947 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
948 | fatal("key_demote: BN_dup failed"); | |
949 | break; | |
950 | case KEY_DSA: | |
951 | if ((pk->dsa = DSA_new()) == NULL) | |
952 | fatal("key_demote: DSA_new failed"); | |
953 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
954 | fatal("key_demote: BN_dup failed"); | |
955 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
956 | fatal("key_demote: BN_dup failed"); | |
957 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
958 | fatal("key_demote: BN_dup failed"); | |
959 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
960 | fatal("key_demote: BN_dup failed"); | |
961 | break; | |
962 | default: | |
963 | fatal("key_free: bad key type %d", k->type); | |
964 | break; | |
965 | } | |
966 | ||
967 | return (pk); | |
968 | } |