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3c0ef626 | 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, 2001 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" | |
e9a17296 | 35 | RCSID("$OpenBSD: key.c,v 1.41 2002/02/28 15:46:33 markus Exp $"); |
3c0ef626 | 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->flags = 0; | |
58 | k->dsa = NULL; | |
59 | k->rsa = NULL; | |
60 | switch (k->type) { | |
61 | case KEY_RSA1: | |
62 | case KEY_RSA: | |
e9a17296 | 63 | if ((rsa = RSA_new()) == NULL) |
64 | fatal("key_new: RSA_new failed"); | |
65 | if ((rsa->n = BN_new()) == NULL) | |
66 | fatal("key_new: BN_new failed"); | |
67 | if ((rsa->e = BN_new()) == NULL) | |
68 | fatal("key_new: BN_new failed"); | |
3c0ef626 | 69 | k->rsa = rsa; |
70 | break; | |
71 | case KEY_DSA: | |
e9a17296 | 72 | if ((dsa = DSA_new()) == NULL) |
73 | fatal("key_new: DSA_new failed"); | |
74 | if ((dsa->p = BN_new()) == NULL) | |
75 | fatal("key_new: BN_new failed"); | |
76 | if ((dsa->q = BN_new()) == NULL) | |
77 | fatal("key_new: BN_new failed"); | |
78 | if ((dsa->g = BN_new()) == NULL) | |
79 | fatal("key_new: BN_new failed"); | |
80 | if ((dsa->pub_key = BN_new()) == NULL) | |
81 | fatal("key_new: BN_new failed"); | |
3c0ef626 | 82 | k->dsa = dsa; |
83 | break; | |
84 | case KEY_UNSPEC: | |
85 | break; | |
86 | default: | |
87 | fatal("key_new: bad key type %d", k->type); | |
88 | break; | |
89 | } | |
90 | return k; | |
91 | } | |
92 | Key * | |
93 | key_new_private(int type) | |
94 | { | |
95 | Key *k = key_new(type); | |
96 | switch (k->type) { | |
97 | case KEY_RSA1: | |
98 | case KEY_RSA: | |
e9a17296 | 99 | if ((k->rsa->d = BN_new()) == NULL) |
100 | fatal("key_new_private: BN_new failed"); | |
101 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
102 | fatal("key_new_private: BN_new failed"); | |
103 | if ((k->rsa->q = BN_new()) == NULL) | |
104 | fatal("key_new_private: BN_new failed"); | |
105 | if ((k->rsa->p = BN_new()) == NULL) | |
106 | fatal("key_new_private: BN_new failed"); | |
107 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
108 | fatal("key_new_private: BN_new failed"); | |
109 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
110 | fatal("key_new_private: BN_new failed"); | |
3c0ef626 | 111 | break; |
112 | case KEY_DSA: | |
e9a17296 | 113 | if ((k->dsa->priv_key = BN_new()) == NULL) |
114 | fatal("key_new_private: BN_new failed"); | |
3c0ef626 | 115 | break; |
116 | case KEY_UNSPEC: | |
117 | break; | |
118 | default: | |
119 | break; | |
120 | } | |
121 | return k; | |
122 | } | |
123 | void | |
124 | key_free(Key *k) | |
125 | { | |
126 | switch (k->type) { | |
127 | case KEY_RSA1: | |
128 | case KEY_RSA: | |
129 | if (k->rsa != NULL) | |
130 | RSA_free(k->rsa); | |
131 | k->rsa = NULL; | |
132 | break; | |
133 | case KEY_DSA: | |
134 | if (k->dsa != NULL) | |
135 | DSA_free(k->dsa); | |
136 | k->dsa = NULL; | |
137 | break; | |
138 | case KEY_UNSPEC: | |
139 | break; | |
140 | default: | |
141 | fatal("key_free: bad key type %d", k->type); | |
142 | break; | |
143 | } | |
144 | xfree(k); | |
145 | } | |
146 | int | |
147 | key_equal(Key *a, Key *b) | |
148 | { | |
149 | if (a == NULL || b == NULL || a->type != b->type) | |
150 | return 0; | |
151 | switch (a->type) { | |
152 | case KEY_RSA1: | |
153 | case KEY_RSA: | |
154 | return a->rsa != NULL && b->rsa != NULL && | |
155 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
156 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
157 | break; | |
158 | case KEY_DSA: | |
159 | return a->dsa != NULL && b->dsa != NULL && | |
160 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
161 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
162 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
163 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
164 | break; | |
165 | default: | |
166 | fatal("key_equal: bad key type %d", a->type); | |
167 | break; | |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static u_char* | |
e9a17296 | 173 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length) |
3c0ef626 | 174 | { |
e9a17296 | 175 | const EVP_MD *md = NULL; |
3c0ef626 | 176 | EVP_MD_CTX ctx; |
177 | u_char *blob = NULL; | |
178 | u_char *retval = NULL; | |
e9a17296 | 179 | u_int len = 0; |
3c0ef626 | 180 | int nlen, elen; |
181 | ||
182 | *dgst_raw_length = 0; | |
183 | ||
184 | switch (dgst_type) { | |
185 | case SSH_FP_MD5: | |
186 | md = EVP_md5(); | |
187 | break; | |
188 | case SSH_FP_SHA1: | |
189 | md = EVP_sha1(); | |
190 | break; | |
191 | default: | |
192 | fatal("key_fingerprint_raw: bad digest type %d", | |
193 | dgst_type); | |
194 | } | |
195 | switch (k->type) { | |
196 | case KEY_RSA1: | |
197 | nlen = BN_num_bytes(k->rsa->n); | |
198 | elen = BN_num_bytes(k->rsa->e); | |
199 | len = nlen + elen; | |
200 | blob = xmalloc(len); | |
201 | BN_bn2bin(k->rsa->n, blob); | |
202 | BN_bn2bin(k->rsa->e, blob + nlen); | |
203 | break; | |
204 | case KEY_DSA: | |
205 | case KEY_RSA: | |
206 | key_to_blob(k, &blob, &len); | |
207 | break; | |
208 | case KEY_UNSPEC: | |
209 | return retval; | |
210 | break; | |
211 | default: | |
212 | fatal("key_fingerprint_raw: bad key type %d", k->type); | |
213 | break; | |
214 | } | |
215 | if (blob != NULL) { | |
216 | retval = xmalloc(EVP_MAX_MD_SIZE); | |
217 | EVP_DigestInit(&ctx, md); | |
218 | EVP_DigestUpdate(&ctx, blob, len); | |
e9a17296 | 219 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
3c0ef626 | 220 | memset(blob, 0, len); |
221 | xfree(blob); | |
222 | } else { | |
223 | fatal("key_fingerprint_raw: blob is null"); | |
224 | } | |
225 | return retval; | |
226 | } | |
227 | ||
228 | static char* | |
e9a17296 | 229 | key_fingerprint_hex(u_char* dgst_raw, u_int dgst_raw_len) |
3c0ef626 | 230 | { |
231 | char *retval; | |
232 | int i; | |
233 | ||
234 | retval = xmalloc(dgst_raw_len * 3 + 1); | |
235 | retval[0] = '\0'; | |
e9a17296 | 236 | for (i = 0; i < dgst_raw_len; i++) { |
3c0ef626 | 237 | char hex[4]; |
238 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
239 | strlcat(retval, hex, dgst_raw_len * 3); | |
240 | } | |
241 | retval[(dgst_raw_len * 3) - 1] = '\0'; | |
242 | return retval; | |
243 | } | |
244 | ||
245 | static char* | |
e9a17296 | 246 | key_fingerprint_bubblebabble(u_char* dgst_raw, u_int dgst_raw_len) |
3c0ef626 | 247 | { |
248 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
249 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
250 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
251 | u_int i, j = 0, rounds, seed = 1; | |
252 | char *retval; | |
253 | ||
254 | rounds = (dgst_raw_len / 2) + 1; | |
255 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
256 | retval[j++] = 'x'; | |
257 | for (i = 0; i < rounds; i++) { | |
258 | u_int idx0, idx1, idx2, idx3, idx4; | |
259 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { | |
260 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
261 | seed) % 6; | |
262 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; | |
263 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
264 | (seed / 6)) % 6; | |
265 | retval[j++] = vowels[idx0]; | |
266 | retval[j++] = consonants[idx1]; | |
267 | retval[j++] = vowels[idx2]; | |
268 | if ((i + 1) < rounds) { | |
269 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
270 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
271 | retval[j++] = consonants[idx3]; | |
272 | retval[j++] = '-'; | |
273 | retval[j++] = consonants[idx4]; | |
274 | seed = ((seed * 5) + | |
275 | ((((u_int)(dgst_raw[2 * i])) * 7) + | |
276 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
277 | } | |
278 | } else { | |
279 | idx0 = seed % 6; | |
280 | idx1 = 16; | |
281 | idx2 = seed / 6; | |
282 | retval[j++] = vowels[idx0]; | |
283 | retval[j++] = consonants[idx1]; | |
284 | retval[j++] = vowels[idx2]; | |
285 | } | |
286 | } | |
287 | retval[j++] = 'x'; | |
288 | retval[j++] = '\0'; | |
289 | return retval; | |
290 | } | |
291 | ||
292 | char* | |
293 | key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) | |
294 | { | |
295 | char *retval = NULL; | |
296 | u_char *dgst_raw; | |
e9a17296 | 297 | u_int dgst_raw_len; |
298 | ||
3c0ef626 | 299 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
300 | if (!dgst_raw) | |
301 | fatal("key_fingerprint: null from key_fingerprint_raw()"); | |
e9a17296 | 302 | switch (dgst_rep) { |
3c0ef626 | 303 | case SSH_FP_HEX: |
304 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
305 | break; | |
306 | case SSH_FP_BUBBLEBABBLE: | |
307 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
308 | break; | |
309 | default: | |
310 | fatal("key_fingerprint_ex: bad digest representation %d", | |
311 | dgst_rep); | |
312 | break; | |
313 | } | |
314 | memset(dgst_raw, 0, dgst_raw_len); | |
315 | xfree(dgst_raw); | |
316 | return retval; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
321 | * the pointer. The integer must already be initialized. This function is | |
322 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
323 | * last processed (and maybe modified) character. Note that this may modify | |
324 | * the buffer containing the number. | |
325 | */ | |
326 | static int | |
327 | read_bignum(char **cpp, BIGNUM * value) | |
328 | { | |
329 | char *cp = *cpp; | |
330 | int old; | |
331 | ||
332 | /* Skip any leading whitespace. */ | |
333 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
334 | ; | |
335 | ||
336 | /* Check that it begins with a decimal digit. */ | |
337 | if (*cp < '0' || *cp > '9') | |
338 | return 0; | |
339 | ||
340 | /* Save starting position. */ | |
341 | *cpp = cp; | |
342 | ||
343 | /* Move forward until all decimal digits skipped. */ | |
344 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
345 | ; | |
346 | ||
347 | /* Save the old terminating character, and replace it by \0. */ | |
348 | old = *cp; | |
349 | *cp = 0; | |
350 | ||
351 | /* Parse the number. */ | |
352 | if (BN_dec2bn(&value, *cpp) == 0) | |
353 | return 0; | |
354 | ||
355 | /* Restore old terminating character. */ | |
356 | *cp = old; | |
357 | ||
358 | /* Move beyond the number and return success. */ | |
359 | *cpp = cp; | |
360 | return 1; | |
361 | } | |
362 | static int | |
363 | write_bignum(FILE *f, BIGNUM *num) | |
364 | { | |
365 | char *buf = BN_bn2dec(num); | |
366 | if (buf == NULL) { | |
367 | error("write_bignum: BN_bn2dec() failed"); | |
368 | return 0; | |
369 | } | |
370 | fprintf(f, " %s", buf); | |
371 | OPENSSL_free(buf); | |
372 | return 1; | |
373 | } | |
374 | ||
375 | /* returns 1 ok, -1 error */ | |
376 | int | |
377 | key_read(Key *ret, char **cpp) | |
378 | { | |
379 | Key *k; | |
380 | int success = -1; | |
381 | char *cp, *space; | |
382 | int len, n, type; | |
383 | u_int bits; | |
384 | u_char *blob; | |
385 | ||
386 | cp = *cpp; | |
387 | ||
e9a17296 | 388 | switch (ret->type) { |
3c0ef626 | 389 | case KEY_RSA1: |
390 | /* Get number of bits. */ | |
391 | if (*cp < '0' || *cp > '9') | |
392 | return -1; /* Bad bit count... */ | |
393 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) | |
394 | bits = 10 * bits + *cp - '0'; | |
395 | if (bits == 0) | |
396 | return -1; | |
397 | *cpp = cp; | |
398 | /* Get public exponent, public modulus. */ | |
399 | if (!read_bignum(cpp, ret->rsa->e)) | |
400 | return -1; | |
401 | if (!read_bignum(cpp, ret->rsa->n)) | |
402 | return -1; | |
403 | success = 1; | |
404 | break; | |
405 | case KEY_UNSPEC: | |
406 | case KEY_RSA: | |
407 | case KEY_DSA: | |
408 | space = strchr(cp, ' '); | |
409 | if (space == NULL) { | |
410 | debug3("key_read: no space"); | |
411 | return -1; | |
412 | } | |
413 | *space = '\0'; | |
414 | type = key_type_from_name(cp); | |
415 | *space = ' '; | |
416 | if (type == KEY_UNSPEC) { | |
417 | debug3("key_read: no key found"); | |
418 | return -1; | |
419 | } | |
420 | cp = space+1; | |
421 | if (*cp == '\0') { | |
422 | debug3("key_read: short string"); | |
423 | return -1; | |
424 | } | |
425 | if (ret->type == KEY_UNSPEC) { | |
426 | ret->type = type; | |
427 | } else if (ret->type != type) { | |
428 | /* is a key, but different type */ | |
429 | debug3("key_read: type mismatch"); | |
430 | return -1; | |
431 | } | |
432 | len = 2*strlen(cp); | |
433 | blob = xmalloc(len); | |
434 | n = uudecode(cp, blob, len); | |
435 | if (n < 0) { | |
436 | error("key_read: uudecode %s failed", cp); | |
e9a17296 | 437 | xfree(blob); |
3c0ef626 | 438 | return -1; |
439 | } | |
440 | k = key_from_blob(blob, n); | |
e9a17296 | 441 | xfree(blob); |
3c0ef626 | 442 | if (k == NULL) { |
443 | error("key_read: key_from_blob %s failed", cp); | |
444 | return -1; | |
445 | } | |
3c0ef626 | 446 | if (k->type != type) { |
447 | error("key_read: type mismatch: encoding error"); | |
448 | key_free(k); | |
449 | return -1; | |
450 | } | |
451 | /*XXXX*/ | |
452 | if (ret->type == KEY_RSA) { | |
453 | if (ret->rsa != NULL) | |
454 | RSA_free(ret->rsa); | |
455 | ret->rsa = k->rsa; | |
456 | k->rsa = NULL; | |
457 | success = 1; | |
458 | #ifdef DEBUG_PK | |
459 | RSA_print_fp(stderr, ret->rsa, 8); | |
460 | #endif | |
461 | } else { | |
462 | if (ret->dsa != NULL) | |
463 | DSA_free(ret->dsa); | |
464 | ret->dsa = k->dsa; | |
465 | k->dsa = NULL; | |
466 | success = 1; | |
467 | #ifdef DEBUG_PK | |
468 | DSA_print_fp(stderr, ret->dsa, 8); | |
469 | #endif | |
470 | } | |
471 | /*XXXX*/ | |
e9a17296 | 472 | key_free(k); |
3c0ef626 | 473 | if (success != 1) |
474 | break; | |
3c0ef626 | 475 | /* advance cp: skip whitespace and data */ |
476 | while (*cp == ' ' || *cp == '\t') | |
477 | cp++; | |
478 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
479 | cp++; | |
480 | *cpp = cp; | |
481 | break; | |
482 | default: | |
483 | fatal("key_read: bad key type: %d", ret->type); | |
484 | break; | |
485 | } | |
486 | return success; | |
487 | } | |
488 | int | |
489 | key_write(Key *key, FILE *f) | |
490 | { | |
e9a17296 | 491 | int n, success = 0; |
492 | u_int len, bits = 0; | |
493 | u_char *blob, *uu; | |
3c0ef626 | 494 | |
495 | if (key->type == KEY_RSA1 && key->rsa != NULL) { | |
496 | /* size of modulus 'n' */ | |
497 | bits = BN_num_bits(key->rsa->n); | |
498 | fprintf(f, "%u", bits); | |
499 | if (write_bignum(f, key->rsa->e) && | |
500 | write_bignum(f, key->rsa->n)) { | |
501 | success = 1; | |
502 | } else { | |
503 | error("key_write: failed for RSA key"); | |
504 | } | |
505 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || | |
506 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
3c0ef626 | 507 | key_to_blob(key, &blob, &len); |
508 | uu = xmalloc(2*len); | |
509 | n = uuencode(blob, len, uu, 2*len); | |
510 | if (n > 0) { | |
511 | fprintf(f, "%s %s", key_ssh_name(key), uu); | |
512 | success = 1; | |
513 | } | |
514 | xfree(blob); | |
515 | xfree(uu); | |
516 | } | |
517 | return success; | |
518 | } | |
519 | char * | |
520 | key_type(Key *k) | |
521 | { | |
522 | switch (k->type) { | |
523 | case KEY_RSA1: | |
524 | return "RSA1"; | |
525 | break; | |
526 | case KEY_RSA: | |
527 | return "RSA"; | |
528 | break; | |
529 | case KEY_DSA: | |
530 | return "DSA"; | |
531 | break; | |
532 | } | |
533 | return "unknown"; | |
534 | } | |
535 | char * | |
536 | key_ssh_name(Key *k) | |
537 | { | |
538 | switch (k->type) { | |
539 | case KEY_RSA: | |
540 | return "ssh-rsa"; | |
541 | break; | |
542 | case KEY_DSA: | |
543 | return "ssh-dss"; | |
544 | break; | |
545 | } | |
546 | return "ssh-unknown"; | |
547 | } | |
548 | u_int | |
e9a17296 | 549 | key_size(Key *k) |
550 | { | |
3c0ef626 | 551 | switch (k->type) { |
552 | case KEY_RSA1: | |
553 | case KEY_RSA: | |
554 | return BN_num_bits(k->rsa->n); | |
555 | break; | |
556 | case KEY_DSA: | |
557 | return BN_num_bits(k->dsa->p); | |
558 | break; | |
559 | } | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static RSA * | |
564 | rsa_generate_private_key(u_int bits) | |
565 | { | |
566 | RSA *private; | |
567 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
568 | if (private == NULL) | |
569 | fatal("rsa_generate_private_key: key generation failed."); | |
570 | return private; | |
571 | } | |
572 | ||
573 | static DSA* | |
574 | dsa_generate_private_key(u_int bits) | |
575 | { | |
576 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
577 | if (private == NULL) | |
578 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
579 | if (!DSA_generate_key(private)) | |
580 | fatal("dsa_generate_private_key: DSA_generate_key failed."); | |
581 | if (private == NULL) | |
582 | fatal("dsa_generate_private_key: NULL."); | |
583 | return private; | |
584 | } | |
585 | ||
586 | Key * | |
587 | key_generate(int type, u_int bits) | |
588 | { | |
589 | Key *k = key_new(KEY_UNSPEC); | |
590 | switch (type) { | |
591 | case KEY_DSA: | |
592 | k->dsa = dsa_generate_private_key(bits); | |
593 | break; | |
594 | case KEY_RSA: | |
595 | case KEY_RSA1: | |
596 | k->rsa = rsa_generate_private_key(bits); | |
597 | break; | |
598 | default: | |
599 | fatal("key_generate: unknown type %d", type); | |
600 | } | |
601 | k->type = type; | |
602 | return k; | |
603 | } | |
604 | ||
605 | Key * | |
606 | key_from_private(Key *k) | |
607 | { | |
608 | Key *n = NULL; | |
609 | switch (k->type) { | |
610 | case KEY_DSA: | |
611 | n = key_new(k->type); | |
612 | BN_copy(n->dsa->p, k->dsa->p); | |
613 | BN_copy(n->dsa->q, k->dsa->q); | |
614 | BN_copy(n->dsa->g, k->dsa->g); | |
615 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
616 | break; | |
617 | case KEY_RSA: | |
618 | case KEY_RSA1: | |
619 | n = key_new(k->type); | |
620 | BN_copy(n->rsa->n, k->rsa->n); | |
621 | BN_copy(n->rsa->e, k->rsa->e); | |
622 | break; | |
623 | default: | |
624 | fatal("key_from_private: unknown type %d", k->type); | |
625 | break; | |
626 | } | |
627 | return n; | |
628 | } | |
629 | ||
630 | int | |
631 | key_type_from_name(char *name) | |
632 | { | |
e9a17296 | 633 | if (strcmp(name, "rsa1") == 0) { |
3c0ef626 | 634 | return KEY_RSA1; |
e9a17296 | 635 | } else if (strcmp(name, "rsa") == 0) { |
3c0ef626 | 636 | return KEY_RSA; |
e9a17296 | 637 | } else if (strcmp(name, "dsa") == 0) { |
3c0ef626 | 638 | return KEY_DSA; |
e9a17296 | 639 | } else if (strcmp(name, "ssh-rsa") == 0) { |
3c0ef626 | 640 | return KEY_RSA; |
e9a17296 | 641 | } else if (strcmp(name, "ssh-dss") == 0) { |
3c0ef626 | 642 | return KEY_DSA; |
643 | } | |
644 | debug2("key_type_from_name: unknown key type '%s'", name); | |
645 | return KEY_UNSPEC; | |
646 | } | |
647 | ||
648 | int | |
649 | key_names_valid2(const char *names) | |
650 | { | |
651 | char *s, *cp, *p; | |
652 | ||
653 | if (names == NULL || strcmp(names, "") == 0) | |
654 | return 0; | |
655 | s = cp = xstrdup(names); | |
656 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
e9a17296 | 657 | (p = strsep(&cp, ","))) { |
3c0ef626 | 658 | switch (key_type_from_name(p)) { |
659 | case KEY_RSA1: | |
660 | case KEY_UNSPEC: | |
661 | xfree(s); | |
662 | return 0; | |
663 | } | |
664 | } | |
665 | debug3("key names ok: [%s]", names); | |
666 | xfree(s); | |
667 | return 1; | |
668 | } | |
669 | ||
670 | Key * | |
671 | key_from_blob(u_char *blob, int blen) | |
672 | { | |
673 | Buffer b; | |
674 | char *ktype; | |
675 | int rlen, type; | |
676 | Key *key = NULL; | |
677 | ||
678 | #ifdef DEBUG_PK | |
679 | dump_base64(stderr, blob, blen); | |
680 | #endif | |
681 | buffer_init(&b); | |
682 | buffer_append(&b, blob, blen); | |
683 | ktype = buffer_get_string(&b, NULL); | |
684 | type = key_type_from_name(ktype); | |
685 | ||
e9a17296 | 686 | switch (type) { |
3c0ef626 | 687 | case KEY_RSA: |
688 | key = key_new(type); | |
689 | buffer_get_bignum2(&b, key->rsa->e); | |
690 | buffer_get_bignum2(&b, key->rsa->n); | |
691 | #ifdef DEBUG_PK | |
692 | RSA_print_fp(stderr, key->rsa, 8); | |
693 | #endif | |
694 | break; | |
695 | case KEY_DSA: | |
696 | key = key_new(type); | |
697 | buffer_get_bignum2(&b, key->dsa->p); | |
698 | buffer_get_bignum2(&b, key->dsa->q); | |
699 | buffer_get_bignum2(&b, key->dsa->g); | |
700 | buffer_get_bignum2(&b, key->dsa->pub_key); | |
701 | #ifdef DEBUG_PK | |
702 | DSA_print_fp(stderr, key->dsa, 8); | |
703 | #endif | |
704 | break; | |
705 | case KEY_UNSPEC: | |
706 | key = key_new(type); | |
707 | break; | |
708 | default: | |
709 | error("key_from_blob: cannot handle type %s", ktype); | |
710 | break; | |
711 | } | |
712 | rlen = buffer_len(&b); | |
713 | if (key != NULL && rlen != 0) | |
714 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
715 | xfree(ktype); | |
716 | buffer_free(&b); | |
717 | return key; | |
718 | } | |
719 | ||
720 | int | |
721 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) | |
722 | { | |
723 | Buffer b; | |
724 | int len; | |
725 | u_char *buf; | |
726 | ||
727 | if (key == NULL) { | |
728 | error("key_to_blob: key == NULL"); | |
729 | return 0; | |
730 | } | |
731 | buffer_init(&b); | |
e9a17296 | 732 | switch (key->type) { |
3c0ef626 | 733 | case KEY_DSA: |
734 | buffer_put_cstring(&b, key_ssh_name(key)); | |
735 | buffer_put_bignum2(&b, key->dsa->p); | |
736 | buffer_put_bignum2(&b, key->dsa->q); | |
737 | buffer_put_bignum2(&b, key->dsa->g); | |
738 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
739 | break; | |
740 | case KEY_RSA: | |
741 | buffer_put_cstring(&b, key_ssh_name(key)); | |
742 | buffer_put_bignum2(&b, key->rsa->e); | |
743 | buffer_put_bignum2(&b, key->rsa->n); | |
744 | break; | |
745 | default: | |
746 | error("key_to_blob: unsupported key type %d", key->type); | |
747 | buffer_free(&b); | |
748 | return 0; | |
749 | } | |
750 | len = buffer_len(&b); | |
751 | buf = xmalloc(len); | |
752 | memcpy(buf, buffer_ptr(&b), len); | |
753 | memset(buffer_ptr(&b), 0, len); | |
754 | buffer_free(&b); | |
755 | if (lenp != NULL) | |
756 | *lenp = len; | |
757 | if (blobp != NULL) | |
758 | *blobp = buf; | |
759 | return len; | |
760 | } | |
761 | ||
762 | int | |
763 | key_sign( | |
764 | Key *key, | |
e9a17296 | 765 | u_char **sigp, u_int *lenp, |
766 | u_char *data, u_int datalen) | |
3c0ef626 | 767 | { |
e9a17296 | 768 | switch (key->type) { |
3c0ef626 | 769 | case KEY_DSA: |
770 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
771 | break; | |
772 | case KEY_RSA: | |
773 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
774 | break; | |
775 | default: | |
776 | error("key_sign: illegal key type %d", key->type); | |
777 | return -1; | |
778 | break; | |
779 | } | |
780 | } | |
781 | ||
782 | int | |
783 | key_verify( | |
784 | Key *key, | |
e9a17296 | 785 | u_char *signature, u_int signaturelen, |
786 | u_char *data, u_int datalen) | |
3c0ef626 | 787 | { |
788 | if (signaturelen == 0) | |
789 | return -1; | |
790 | ||
e9a17296 | 791 | switch (key->type) { |
3c0ef626 | 792 | case KEY_DSA: |
793 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
794 | break; | |
795 | case KEY_RSA: | |
796 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
797 | break; | |
798 | default: | |
799 | error("key_verify: illegal key type %d", key->type); | |
800 | return -1; | |
801 | break; | |
802 | } | |
803 | } |