]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * read_bignum(): | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * | |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
11 | * | |
12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | */ | |
34 | #include "includes.h" | |
35 | RCSID("$OpenBSD: key.c,v 1.25 2001/04/17 10:53:24 markus Exp $"); | |
36 | ||
37 | #include <openssl/evp.h> | |
38 | ||
39 | #include "xmalloc.h" | |
40 | #include "key.h" | |
41 | #include "rsa.h" | |
42 | #include "ssh-dss.h" | |
43 | #include "ssh-rsa.h" | |
44 | #include "uuencode.h" | |
45 | #include "buffer.h" | |
46 | #include "bufaux.h" | |
47 | #include "log.h" | |
48 | ||
49 | Key * | |
50 | key_new(int type) | |
51 | { | |
52 | Key *k; | |
53 | RSA *rsa; | |
54 | DSA *dsa; | |
55 | k = xmalloc(sizeof(*k)); | |
56 | k->type = type; | |
57 | k->dsa = NULL; | |
58 | k->rsa = NULL; | |
59 | switch (k->type) { | |
60 | case KEY_RSA1: | |
61 | case KEY_RSA: | |
62 | rsa = RSA_new(); | |
63 | rsa->n = BN_new(); | |
64 | rsa->e = BN_new(); | |
65 | k->rsa = rsa; | |
66 | break; | |
67 | case KEY_DSA: | |
68 | dsa = DSA_new(); | |
69 | dsa->p = BN_new(); | |
70 | dsa->q = BN_new(); | |
71 | dsa->g = BN_new(); | |
72 | dsa->pub_key = BN_new(); | |
73 | k->dsa = dsa; | |
74 | break; | |
75 | case KEY_UNSPEC: | |
76 | break; | |
77 | default: | |
78 | fatal("key_new: bad key type %d", k->type); | |
79 | break; | |
80 | } | |
81 | return k; | |
82 | } | |
83 | Key * | |
84 | key_new_private(int type) | |
85 | { | |
86 | Key *k = key_new(type); | |
87 | switch (k->type) { | |
88 | case KEY_RSA1: | |
89 | case KEY_RSA: | |
90 | k->rsa->d = BN_new(); | |
91 | k->rsa->iqmp = BN_new(); | |
92 | k->rsa->q = BN_new(); | |
93 | k->rsa->p = BN_new(); | |
94 | k->rsa->dmq1 = BN_new(); | |
95 | k->rsa->dmp1 = BN_new(); | |
96 | break; | |
97 | case KEY_DSA: | |
98 | k->dsa->priv_key = BN_new(); | |
99 | break; | |
100 | case KEY_UNSPEC: | |
101 | break; | |
102 | default: | |
103 | break; | |
104 | } | |
105 | return k; | |
106 | } | |
107 | void | |
108 | key_free(Key *k) | |
109 | { | |
110 | switch (k->type) { | |
111 | case KEY_RSA1: | |
112 | case KEY_RSA: | |
113 | if (k->rsa != NULL) | |
114 | RSA_free(k->rsa); | |
115 | k->rsa = NULL; | |
116 | break; | |
117 | case KEY_DSA: | |
118 | if (k->dsa != NULL) | |
119 | DSA_free(k->dsa); | |
120 | k->dsa = NULL; | |
121 | break; | |
122 | case KEY_UNSPEC: | |
123 | break; | |
124 | default: | |
125 | fatal("key_free: bad key type %d", k->type); | |
126 | break; | |
127 | } | |
128 | xfree(k); | |
129 | } | |
130 | int | |
131 | key_equal(Key *a, Key *b) | |
132 | { | |
133 | if (a == NULL || b == NULL || a->type != b->type) | |
134 | return 0; | |
135 | switch (a->type) { | |
136 | case KEY_RSA1: | |
137 | case KEY_RSA: | |
138 | return a->rsa != NULL && b->rsa != NULL && | |
139 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
140 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
141 | break; | |
142 | case KEY_DSA: | |
143 | return a->dsa != NULL && b->dsa != NULL && | |
144 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
145 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
146 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
147 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
148 | break; | |
149 | default: | |
150 | fatal("key_equal: bad key type %d", a->type); | |
151 | break; | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
156 | u_char* | |
157 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length) | |
158 | { | |
159 | EVP_MD *md = NULL; | |
160 | EVP_MD_CTX ctx; | |
161 | u_char *blob = NULL; | |
162 | u_char *retval = NULL; | |
163 | int len = 0; | |
164 | int nlen, elen; | |
165 | ||
166 | *dgst_raw_length = 0; | |
167 | ||
168 | switch (dgst_type) { | |
169 | case SSH_FP_MD5: | |
170 | md = EVP_md5(); | |
171 | break; | |
172 | case SSH_FP_SHA1: | |
173 | md = EVP_sha1(); | |
174 | break; | |
175 | default: | |
176 | fatal("key_fingerprint_raw: bad digest type %d", | |
177 | dgst_type); | |
178 | } | |
179 | switch (k->type) { | |
180 | case KEY_RSA1: | |
181 | nlen = BN_num_bytes(k->rsa->n); | |
182 | elen = BN_num_bytes(k->rsa->e); | |
183 | len = nlen + elen; | |
184 | blob = xmalloc(len); | |
185 | BN_bn2bin(k->rsa->n, blob); | |
186 | BN_bn2bin(k->rsa->e, blob + nlen); | |
187 | break; | |
188 | case KEY_DSA: | |
189 | case KEY_RSA: | |
190 | key_to_blob(k, &blob, &len); | |
191 | break; | |
192 | case KEY_UNSPEC: | |
193 | return retval; | |
194 | break; | |
195 | default: | |
196 | fatal("key_fingerprint_raw: bad key type %d", k->type); | |
197 | break; | |
198 | } | |
199 | if (blob != NULL) { | |
200 | retval = xmalloc(EVP_MAX_MD_SIZE); | |
201 | EVP_DigestInit(&ctx, md); | |
202 | EVP_DigestUpdate(&ctx, blob, len); | |
203 | EVP_DigestFinal(&ctx, retval, NULL); | |
204 | *dgst_raw_length = md->md_size; | |
205 | memset(blob, 0, len); | |
206 | xfree(blob); | |
207 | } else { | |
208 | fatal("key_fingerprint_raw: blob is null"); | |
209 | } | |
210 | return retval; | |
211 | } | |
212 | ||
213 | char* | |
214 | key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) | |
215 | { | |
216 | char *retval; | |
217 | int i; | |
218 | ||
219 | retval = xmalloc(dgst_raw_len * 3 + 1); | |
220 | retval[0] = '\0'; | |
221 | for(i = 0; i < dgst_raw_len; i++) { | |
222 | char hex[4]; | |
223 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
224 | strlcat(retval, hex, dgst_raw_len * 3); | |
225 | } | |
226 | retval[(dgst_raw_len * 3) - 1] = '\0'; | |
227 | return retval; | |
228 | } | |
229 | ||
230 | char* | |
231 | key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) | |
232 | { | |
233 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
234 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
235 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
236 | u_int i, j = 0, rounds, seed = 1; | |
237 | char *retval; | |
238 | ||
239 | rounds = (dgst_raw_len / 2) + 1; | |
240 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
241 | retval[j++] = 'x'; | |
242 | for (i = 0; i < rounds; i++) { | |
243 | u_int idx0, idx1, idx2, idx3, idx4; | |
244 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { | |
245 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
246 | seed) % 6; | |
247 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; | |
248 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
249 | (seed / 6)) % 6; | |
250 | retval[j++] = vowels[idx0]; | |
251 | retval[j++] = consonants[idx1]; | |
252 | retval[j++] = vowels[idx2]; | |
253 | if ((i + 1) < rounds) { | |
254 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
255 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
256 | retval[j++] = consonants[idx3]; | |
257 | retval[j++] = '-'; | |
258 | retval[j++] = consonants[idx4]; | |
259 | seed = ((seed * 5) + | |
260 | ((((u_int)(dgst_raw[2 * i])) * 7) + | |
261 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
262 | } | |
263 | } else { | |
264 | idx0 = seed % 6; | |
265 | idx1 = 16; | |
266 | idx2 = seed / 6; | |
267 | retval[j++] = vowels[idx0]; | |
268 | retval[j++] = consonants[idx1]; | |
269 | retval[j++] = vowels[idx2]; | |
270 | } | |
271 | } | |
272 | retval[j++] = 'x'; | |
273 | retval[j++] = '\0'; | |
274 | return retval; | |
275 | } | |
276 | ||
277 | char* | |
278 | key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) | |
279 | { | |
280 | char *retval = NULL; | |
281 | u_char *dgst_raw; | |
282 | size_t dgst_raw_len; | |
283 | ||
284 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); | |
285 | if (!dgst_raw) | |
286 | fatal("key_fingerprint: null from key_fingerprint_raw()"); | |
287 | switch(dgst_rep) { | |
288 | case SSH_FP_HEX: | |
289 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
290 | break; | |
291 | case SSH_FP_BUBBLEBABBLE: | |
292 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
293 | break; | |
294 | default: | |
295 | fatal("key_fingerprint_ex: bad digest representation %d", | |
296 | dgst_rep); | |
297 | break; | |
298 | } | |
299 | memset(dgst_raw, 0, dgst_raw_len); | |
300 | xfree(dgst_raw); | |
301 | return retval; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
306 | * the pointer. The integer must already be initialized. This function is | |
307 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
308 | * last processed (and maybe modified) character. Note that this may modify | |
309 | * the buffer containing the number. | |
310 | */ | |
311 | int | |
312 | read_bignum(char **cpp, BIGNUM * value) | |
313 | { | |
314 | char *cp = *cpp; | |
315 | int old; | |
316 | ||
317 | /* Skip any leading whitespace. */ | |
318 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
319 | ; | |
320 | ||
321 | /* Check that it begins with a decimal digit. */ | |
322 | if (*cp < '0' || *cp > '9') | |
323 | return 0; | |
324 | ||
325 | /* Save starting position. */ | |
326 | *cpp = cp; | |
327 | ||
328 | /* Move forward until all decimal digits skipped. */ | |
329 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
330 | ; | |
331 | ||
332 | /* Save the old terminating character, and replace it by \0. */ | |
333 | old = *cp; | |
334 | *cp = 0; | |
335 | ||
336 | /* Parse the number. */ | |
337 | if (BN_dec2bn(&value, *cpp) == 0) | |
338 | return 0; | |
339 | ||
340 | /* Restore old terminating character. */ | |
341 | *cp = old; | |
342 | ||
343 | /* Move beyond the number and return success. */ | |
344 | *cpp = cp; | |
345 | return 1; | |
346 | } | |
347 | int | |
348 | write_bignum(FILE *f, BIGNUM *num) | |
349 | { | |
350 | char *buf = BN_bn2dec(num); | |
351 | if (buf == NULL) { | |
352 | error("write_bignum: BN_bn2dec() failed"); | |
353 | return 0; | |
354 | } | |
355 | fprintf(f, " %s", buf); | |
356 | xfree(buf); | |
357 | return 1; | |
358 | } | |
359 | ||
360 | /* returns 1 ok, -1 error, 0 type mismatch */ | |
361 | int | |
362 | key_read(Key *ret, char **cpp) | |
363 | { | |
364 | Key *k; | |
365 | int success = -1; | |
366 | char *cp, *space; | |
367 | int len, n, type; | |
368 | u_int bits; | |
369 | u_char *blob; | |
370 | ||
371 | cp = *cpp; | |
372 | ||
373 | switch(ret->type) { | |
374 | case KEY_RSA1: | |
375 | /* Get number of bits. */ | |
376 | if (*cp < '0' || *cp > '9') | |
377 | return -1; /* Bad bit count... */ | |
378 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) | |
379 | bits = 10 * bits + *cp - '0'; | |
380 | if (bits == 0) | |
381 | return -1; | |
382 | *cpp = cp; | |
383 | /* Get public exponent, public modulus. */ | |
384 | if (!read_bignum(cpp, ret->rsa->e)) | |
385 | return -1; | |
386 | if (!read_bignum(cpp, ret->rsa->n)) | |
387 | return -1; | |
388 | success = 1; | |
389 | break; | |
390 | case KEY_UNSPEC: | |
391 | case KEY_RSA: | |
392 | case KEY_DSA: | |
393 | space = strchr(cp, ' '); | |
394 | if (space == NULL) { | |
395 | debug3("key_read: no space"); | |
396 | return -1; | |
397 | } | |
398 | *space = '\0'; | |
399 | type = key_type_from_name(cp); | |
400 | *space = ' '; | |
401 | if (type == KEY_UNSPEC) { | |
402 | debug3("key_read: no key found"); | |
403 | return -1; | |
404 | } | |
405 | cp = space+1; | |
406 | if (*cp == '\0') { | |
407 | debug3("key_read: short string"); | |
408 | return -1; | |
409 | } | |
410 | if (ret->type == KEY_UNSPEC) { | |
411 | ret->type = type; | |
412 | } else if (ret->type != type) { | |
413 | /* is a key, but different type */ | |
414 | debug3("key_read: type mismatch"); | |
415 | return 0; | |
416 | } | |
417 | len = 2*strlen(cp); | |
418 | blob = xmalloc(len); | |
419 | n = uudecode(cp, blob, len); | |
420 | if (n < 0) { | |
421 | error("key_read: uudecode %s failed", cp); | |
422 | return -1; | |
423 | } | |
424 | k = key_from_blob(blob, n); | |
425 | if (k == NULL) { | |
426 | error("key_read: key_from_blob %s failed", cp); | |
427 | return -1; | |
428 | } | |
429 | xfree(blob); | |
430 | if (k->type != type) { | |
431 | error("key_read: type mismatch: encoding error"); | |
432 | key_free(k); | |
433 | return -1; | |
434 | } | |
435 | /*XXXX*/ | |
436 | if (ret->type == KEY_RSA) { | |
437 | if (ret->rsa != NULL) | |
438 | RSA_free(ret->rsa); | |
439 | ret->rsa = k->rsa; | |
440 | k->rsa = NULL; | |
441 | success = 1; | |
442 | #ifdef DEBUG_PK | |
443 | RSA_print_fp(stderr, ret->rsa, 8); | |
444 | #endif | |
445 | } else { | |
446 | if (ret->dsa != NULL) | |
447 | DSA_free(ret->dsa); | |
448 | ret->dsa = k->dsa; | |
449 | k->dsa = NULL; | |
450 | success = 1; | |
451 | #ifdef DEBUG_PK | |
452 | DSA_print_fp(stderr, ret->dsa, 8); | |
453 | #endif | |
454 | } | |
455 | /*XXXX*/ | |
456 | if (success != 1) | |
457 | break; | |
458 | key_free(k); | |
459 | /* advance cp: skip whitespace and data */ | |
460 | while (*cp == ' ' || *cp == '\t') | |
461 | cp++; | |
462 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
463 | cp++; | |
464 | *cpp = cp; | |
465 | break; | |
466 | default: | |
467 | fatal("key_read: bad key type: %d", ret->type); | |
468 | break; | |
469 | } | |
470 | return success; | |
471 | } | |
472 | int | |
473 | key_write(Key *key, FILE *f) | |
474 | { | |
475 | int success = 0; | |
476 | u_int bits = 0; | |
477 | ||
478 | if (key->type == KEY_RSA1 && key->rsa != NULL) { | |
479 | /* size of modulus 'n' */ | |
480 | bits = BN_num_bits(key->rsa->n); | |
481 | fprintf(f, "%u", bits); | |
482 | if (write_bignum(f, key->rsa->e) && | |
483 | write_bignum(f, key->rsa->n)) { | |
484 | success = 1; | |
485 | } else { | |
486 | error("key_write: failed for RSA key"); | |
487 | } | |
488 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || | |
489 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
490 | int len, n; | |
491 | u_char *blob, *uu; | |
492 | key_to_blob(key, &blob, &len); | |
493 | uu = xmalloc(2*len); | |
494 | n = uuencode(blob, len, uu, 2*len); | |
495 | if (n > 0) { | |
496 | fprintf(f, "%s %s", key_ssh_name(key), uu); | |
497 | success = 1; | |
498 | } | |
499 | xfree(blob); | |
500 | xfree(uu); | |
501 | } | |
502 | return success; | |
503 | } | |
504 | char * | |
505 | key_type(Key *k) | |
506 | { | |
507 | switch (k->type) { | |
508 | case KEY_RSA1: | |
509 | return "RSA1"; | |
510 | break; | |
511 | case KEY_RSA: | |
512 | return "RSA"; | |
513 | break; | |
514 | case KEY_DSA: | |
515 | return "DSA"; | |
516 | break; | |
517 | } | |
518 | return "unknown"; | |
519 | } | |
520 | char * | |
521 | key_ssh_name(Key *k) | |
522 | { | |
523 | switch (k->type) { | |
524 | case KEY_RSA: | |
525 | return "ssh-rsa"; | |
526 | break; | |
527 | case KEY_DSA: | |
528 | return "ssh-dss"; | |
529 | break; | |
530 | } | |
531 | return "ssh-unknown"; | |
532 | } | |
533 | u_int | |
534 | key_size(Key *k){ | |
535 | switch (k->type) { | |
536 | case KEY_RSA1: | |
537 | case KEY_RSA: | |
538 | return BN_num_bits(k->rsa->n); | |
539 | break; | |
540 | case KEY_DSA: | |
541 | return BN_num_bits(k->dsa->p); | |
542 | break; | |
543 | } | |
544 | return 0; | |
545 | } | |
546 | ||
547 | RSA * | |
548 | rsa_generate_private_key(u_int bits) | |
549 | { | |
550 | RSA *private; | |
551 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
552 | if (private == NULL) | |
553 | fatal("rsa_generate_private_key: key generation failed."); | |
554 | return private; | |
555 | } | |
556 | ||
557 | DSA* | |
558 | dsa_generate_private_key(u_int bits) | |
559 | { | |
560 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
561 | if (private == NULL) | |
562 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
563 | if (!DSA_generate_key(private)) | |
564 | fatal("dsa_generate_private_key: DSA_generate_key failed."); | |
565 | if (private == NULL) | |
566 | fatal("dsa_generate_private_key: NULL."); | |
567 | return private; | |
568 | } | |
569 | ||
570 | Key * | |
571 | key_generate(int type, u_int bits) | |
572 | { | |
573 | Key *k = key_new(KEY_UNSPEC); | |
574 | switch (type) { | |
575 | case KEY_DSA: | |
576 | k->dsa = dsa_generate_private_key(bits); | |
577 | break; | |
578 | case KEY_RSA: | |
579 | case KEY_RSA1: | |
580 | k->rsa = rsa_generate_private_key(bits); | |
581 | break; | |
582 | default: | |
583 | fatal("key_generate: unknown type %d", type); | |
584 | } | |
585 | k->type = type; | |
586 | return k; | |
587 | } | |
588 | ||
589 | Key * | |
590 | key_from_private(Key *k) | |
591 | { | |
592 | Key *n = NULL; | |
593 | switch (k->type) { | |
594 | case KEY_DSA: | |
595 | n = key_new(k->type); | |
596 | BN_copy(n->dsa->p, k->dsa->p); | |
597 | BN_copy(n->dsa->q, k->dsa->q); | |
598 | BN_copy(n->dsa->g, k->dsa->g); | |
599 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
600 | break; | |
601 | case KEY_RSA: | |
602 | case KEY_RSA1: | |
603 | n = key_new(k->type); | |
604 | BN_copy(n->rsa->n, k->rsa->n); | |
605 | BN_copy(n->rsa->e, k->rsa->e); | |
606 | break; | |
607 | default: | |
608 | fatal("key_from_private: unknown type %d", k->type); | |
609 | break; | |
610 | } | |
611 | return n; | |
612 | } | |
613 | ||
614 | int | |
615 | key_type_from_name(char *name) | |
616 | { | |
617 | if (strcmp(name, "rsa1") == 0){ | |
618 | return KEY_RSA1; | |
619 | } else if (strcmp(name, "rsa") == 0){ | |
620 | return KEY_RSA; | |
621 | } else if (strcmp(name, "dsa") == 0){ | |
622 | return KEY_DSA; | |
623 | } else if (strcmp(name, "ssh-rsa") == 0){ | |
624 | return KEY_RSA; | |
625 | } else if (strcmp(name, "ssh-dss") == 0){ | |
626 | return KEY_DSA; | |
627 | } | |
628 | debug2("key_type_from_name: unknown key type '%s'", name); | |
629 | return KEY_UNSPEC; | |
630 | } | |
631 | ||
632 | int | |
633 | key_names_valid2(const char *names) | |
634 | { | |
635 | char *s, *cp, *p; | |
636 | ||
637 | if (names == NULL || strcmp(names, "") == 0) | |
638 | return 0; | |
639 | s = cp = xstrdup(names); | |
640 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
641 | (p = strsep(&cp, ","))) { | |
642 | switch (key_type_from_name(p)) { | |
643 | case KEY_RSA1: | |
644 | case KEY_UNSPEC: | |
645 | xfree(s); | |
646 | return 0; | |
647 | } | |
648 | } | |
649 | debug3("key names ok: [%s]", names); | |
650 | xfree(s); | |
651 | return 1; | |
652 | } | |
653 | ||
654 | Key * | |
655 | key_from_blob(char *blob, int blen) | |
656 | { | |
657 | Buffer b; | |
658 | char *ktype; | |
659 | int rlen, type; | |
660 | Key *key = NULL; | |
661 | ||
662 | #ifdef DEBUG_PK | |
663 | dump_base64(stderr, blob, blen); | |
664 | #endif | |
665 | buffer_init(&b); | |
666 | buffer_append(&b, blob, blen); | |
667 | ktype = buffer_get_string(&b, NULL); | |
668 | type = key_type_from_name(ktype); | |
669 | ||
670 | switch(type){ | |
671 | case KEY_RSA: | |
672 | key = key_new(type); | |
673 | buffer_get_bignum2(&b, key->rsa->e); | |
674 | buffer_get_bignum2(&b, key->rsa->n); | |
675 | #ifdef DEBUG_PK | |
676 | RSA_print_fp(stderr, key->rsa, 8); | |
677 | #endif | |
678 | break; | |
679 | case KEY_DSA: | |
680 | key = key_new(type); | |
681 | buffer_get_bignum2(&b, key->dsa->p); | |
682 | buffer_get_bignum2(&b, key->dsa->q); | |
683 | buffer_get_bignum2(&b, key->dsa->g); | |
684 | buffer_get_bignum2(&b, key->dsa->pub_key); | |
685 | #ifdef DEBUG_PK | |
686 | DSA_print_fp(stderr, key->dsa, 8); | |
687 | #endif | |
688 | break; | |
689 | case KEY_UNSPEC: | |
690 | key = key_new(type); | |
691 | break; | |
692 | default: | |
693 | error("key_from_blob: cannot handle type %s", ktype); | |
694 | break; | |
695 | } | |
696 | rlen = buffer_len(&b); | |
697 | if (key != NULL && rlen != 0) | |
698 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
699 | xfree(ktype); | |
700 | buffer_free(&b); | |
701 | return key; | |
702 | } | |
703 | ||
704 | int | |
705 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) | |
706 | { | |
707 | Buffer b; | |
708 | int len; | |
709 | u_char *buf; | |
710 | ||
711 | if (key == NULL) { | |
712 | error("key_to_blob: key == NULL"); | |
713 | return 0; | |
714 | } | |
715 | buffer_init(&b); | |
716 | switch(key->type){ | |
717 | case KEY_DSA: | |
718 | buffer_put_cstring(&b, key_ssh_name(key)); | |
719 | buffer_put_bignum2(&b, key->dsa->p); | |
720 | buffer_put_bignum2(&b, key->dsa->q); | |
721 | buffer_put_bignum2(&b, key->dsa->g); | |
722 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
723 | break; | |
724 | case KEY_RSA: | |
725 | buffer_put_cstring(&b, key_ssh_name(key)); | |
726 | buffer_put_bignum2(&b, key->rsa->e); | |
727 | buffer_put_bignum2(&b, key->rsa->n); | |
728 | break; | |
729 | default: | |
730 | error("key_to_blob: illegal key type %d", key->type); | |
731 | break; | |
732 | } | |
733 | len = buffer_len(&b); | |
734 | buf = xmalloc(len); | |
735 | memcpy(buf, buffer_ptr(&b), len); | |
736 | memset(buffer_ptr(&b), 0, len); | |
737 | buffer_free(&b); | |
738 | if (lenp != NULL) | |
739 | *lenp = len; | |
740 | if (blobp != NULL) | |
741 | *blobp = buf; | |
742 | return len; | |
743 | } | |
744 | ||
745 | int | |
746 | key_sign( | |
747 | Key *key, | |
748 | u_char **sigp, int *lenp, | |
749 | u_char *data, int datalen) | |
750 | { | |
751 | switch(key->type){ | |
752 | case KEY_DSA: | |
753 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
754 | break; | |
755 | case KEY_RSA: | |
756 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
757 | break; | |
758 | default: | |
759 | error("key_sign: illegal key type %d", key->type); | |
760 | return -1; | |
761 | break; | |
762 | } | |
763 | } | |
764 | ||
765 | int | |
766 | key_verify( | |
767 | Key *key, | |
768 | u_char *signature, int signaturelen, | |
769 | u_char *data, int datalen) | |
770 | { | |
771 | switch(key->type){ | |
772 | case KEY_DSA: | |
773 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
774 | break; | |
775 | case KEY_RSA: | |
776 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
777 | break; | |
778 | default: | |
779 | error("key_verify: illegal key type %d", key->type); | |
780 | return -1; | |
781 | break; | |
782 | } | |
783 | } |