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ff7ec503 | 1 | /* $OpenBSD: key.c,v 1.68 2006/11/06 21:25:28 markus Exp $ */ |
3c0ef626 | 2 | /* |
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 | * | |
13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. | |
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. | |
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 | */ | |
9108f8d9 | 35 | |
3c0ef626 | 36 | #include "includes.h" |
9108f8d9 | 37 | |
38 | #include <sys/types.h> | |
3c0ef626 | 39 | |
40 | #include <openssl/evp.h> | |
41 | ||
9108f8d9 | 42 | #include <stdarg.h> |
43 | #include <stdio.h> | |
44 | #include <string.h> | |
45 | ||
3c0ef626 | 46 | #include "xmalloc.h" |
47 | #include "key.h" | |
48 | #include "rsa.h" | |
3c0ef626 | 49 | #include "uuencode.h" |
50 | #include "buffer.h" | |
3c0ef626 | 51 | #include "log.h" |
52 | ||
53 | Key * | |
54 | key_new(int type) | |
55 | { | |
56 | Key *k; | |
57 | RSA *rsa; | |
58 | DSA *dsa; | |
9108f8d9 | 59 | k = xcalloc(1, sizeof(*k)); |
3c0ef626 | 60 | k->type = type; |
3c0ef626 | 61 | k->dsa = NULL; |
62 | k->rsa = NULL; | |
63 | switch (k->type) { | |
64 | case KEY_RSA1: | |
65 | case KEY_RSA: | |
e9a17296 | 66 | if ((rsa = RSA_new()) == NULL) |
67 | fatal("key_new: RSA_new failed"); | |
68 | if ((rsa->n = BN_new()) == NULL) | |
69 | fatal("key_new: BN_new failed"); | |
70 | if ((rsa->e = BN_new()) == NULL) | |
71 | fatal("key_new: BN_new failed"); | |
3c0ef626 | 72 | k->rsa = rsa; |
73 | break; | |
74 | case KEY_DSA: | |
e9a17296 | 75 | if ((dsa = DSA_new()) == NULL) |
76 | fatal("key_new: DSA_new failed"); | |
77 | if ((dsa->p = BN_new()) == NULL) | |
78 | fatal("key_new: BN_new failed"); | |
79 | if ((dsa->q = BN_new()) == NULL) | |
80 | fatal("key_new: BN_new failed"); | |
81 | if ((dsa->g = BN_new()) == NULL) | |
82 | fatal("key_new: BN_new failed"); | |
83 | if ((dsa->pub_key = BN_new()) == NULL) | |
84 | fatal("key_new: BN_new failed"); | |
3c0ef626 | 85 | k->dsa = dsa; |
86 | break; | |
87 | case KEY_UNSPEC: | |
88 | break; | |
89 | default: | |
90 | fatal("key_new: bad key type %d", k->type); | |
91 | break; | |
92 | } | |
93 | return k; | |
94 | } | |
680cee3b | 95 | |
3c0ef626 | 96 | Key * |
97 | key_new_private(int type) | |
98 | { | |
99 | Key *k = key_new(type); | |
100 | switch (k->type) { | |
101 | case KEY_RSA1: | |
102 | case KEY_RSA: | |
e9a17296 | 103 | if ((k->rsa->d = BN_new()) == NULL) |
104 | fatal("key_new_private: BN_new failed"); | |
105 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
106 | fatal("key_new_private: BN_new failed"); | |
107 | if ((k->rsa->q = BN_new()) == NULL) | |
108 | fatal("key_new_private: BN_new failed"); | |
109 | if ((k->rsa->p = BN_new()) == NULL) | |
110 | fatal("key_new_private: BN_new failed"); | |
111 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
112 | fatal("key_new_private: BN_new failed"); | |
113 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
114 | fatal("key_new_private: BN_new failed"); | |
3c0ef626 | 115 | break; |
116 | case KEY_DSA: | |
e9a17296 | 117 | if ((k->dsa->priv_key = BN_new()) == NULL) |
118 | fatal("key_new_private: BN_new failed"); | |
3c0ef626 | 119 | break; |
120 | case KEY_UNSPEC: | |
121 | break; | |
122 | default: | |
123 | break; | |
124 | } | |
125 | return k; | |
126 | } | |
680cee3b | 127 | |
3c0ef626 | 128 | void |
129 | key_free(Key *k) | |
130 | { | |
9108f8d9 | 131 | if (k == NULL) |
132 | fatal("key_free: key is NULL"); | |
3c0ef626 | 133 | switch (k->type) { |
134 | case KEY_RSA1: | |
135 | case KEY_RSA: | |
136 | if (k->rsa != NULL) | |
137 | RSA_free(k->rsa); | |
138 | k->rsa = NULL; | |
139 | break; | |
140 | case KEY_DSA: | |
141 | if (k->dsa != NULL) | |
142 | DSA_free(k->dsa); | |
143 | k->dsa = NULL; | |
144 | break; | |
145 | case KEY_UNSPEC: | |
146 | break; | |
147 | default: | |
148 | fatal("key_free: bad key type %d", k->type); | |
149 | break; | |
150 | } | |
151 | xfree(k); | |
152 | } | |
cdd66111 | 153 | |
3c0ef626 | 154 | int |
cdd66111 | 155 | key_equal(const Key *a, const Key *b) |
3c0ef626 | 156 | { |
157 | if (a == NULL || b == NULL || a->type != b->type) | |
158 | return 0; | |
159 | switch (a->type) { | |
160 | case KEY_RSA1: | |
161 | case KEY_RSA: | |
162 | return a->rsa != NULL && b->rsa != NULL && | |
163 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
164 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
3c0ef626 | 165 | case KEY_DSA: |
166 | return a->dsa != NULL && b->dsa != NULL && | |
167 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
168 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
169 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
170 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
3c0ef626 | 171 | default: |
172 | fatal("key_equal: bad key type %d", a->type); | |
173 | break; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
0fff78ff | 178 | u_char* |
cdd66111 | 179 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
180 | u_int *dgst_raw_length) | |
3c0ef626 | 181 | { |
e9a17296 | 182 | const EVP_MD *md = NULL; |
3c0ef626 | 183 | EVP_MD_CTX ctx; |
184 | u_char *blob = NULL; | |
185 | u_char *retval = NULL; | |
e9a17296 | 186 | u_int len = 0; |
3c0ef626 | 187 | int nlen, elen; |
188 | ||
189 | *dgst_raw_length = 0; | |
190 | ||
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 | } | |
202 | switch (k->type) { | |
203 | case KEY_RSA1: | |
204 | nlen = BN_num_bytes(k->rsa->n); | |
205 | elen = BN_num_bytes(k->rsa->e); | |
206 | len = nlen + elen; | |
207 | blob = xmalloc(len); | |
208 | BN_bn2bin(k->rsa->n, blob); | |
209 | BN_bn2bin(k->rsa->e, blob + nlen); | |
210 | break; | |
211 | case KEY_DSA: | |
212 | case KEY_RSA: | |
213 | key_to_blob(k, &blob, &len); | |
214 | break; | |
215 | case KEY_UNSPEC: | |
216 | return retval; | |
3c0ef626 | 217 | default: |
218 | fatal("key_fingerprint_raw: bad key type %d", k->type); | |
219 | break; | |
220 | } | |
221 | if (blob != NULL) { | |
222 | retval = xmalloc(EVP_MAX_MD_SIZE); | |
223 | EVP_DigestInit(&ctx, md); | |
224 | EVP_DigestUpdate(&ctx, blob, len); | |
e9a17296 | 225 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
3c0ef626 | 226 | memset(blob, 0, len); |
227 | xfree(blob); | |
228 | } else { | |
229 | fatal("key_fingerprint_raw: blob is null"); | |
230 | } | |
231 | return retval; | |
232 | } | |
233 | ||
41b2f314 | 234 | static char * |
235 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
3c0ef626 | 236 | { |
237 | char *retval; | |
665a873d | 238 | u_int i; |
3c0ef626 | 239 | |
9108f8d9 | 240 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
e9a17296 | 241 | for (i = 0; i < dgst_raw_len; i++) { |
3c0ef626 | 242 | char hex[4]; |
243 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
0fff78ff | 244 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
3c0ef626 | 245 | } |
0fff78ff | 246 | |
247 | /* Remove the trailing ':' character */ | |
3c0ef626 | 248 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
249 | return retval; | |
250 | } | |
251 | ||
41b2f314 | 252 | static char * |
253 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
3c0ef626 | 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' }; | |
258 | u_int i, j = 0, rounds, seed = 1; | |
259 | char *retval; | |
260 | ||
261 | rounds = (dgst_raw_len / 2) + 1; | |
9108f8d9 | 262 | retval = xcalloc((rounds * 6), sizeof(char)); |
3c0ef626 | 263 | retval[j++] = 'x'; |
264 | for (i = 0; i < rounds; i++) { | |
265 | u_int idx0, idx1, idx2, idx3, idx4; | |
266 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { | |
267 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
268 | seed) % 6; | |
269 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; | |
270 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
271 | (seed / 6)) % 6; | |
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]; | |
281 | seed = ((seed * 5) + | |
282 | ((((u_int)(dgst_raw[2 * i])) * 7) + | |
283 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
284 | } | |
285 | } else { | |
286 | idx0 = seed % 6; | |
287 | idx1 = 16; | |
288 | idx2 = seed / 6; | |
289 | retval[j++] = vowels[idx0]; | |
290 | retval[j++] = consonants[idx1]; | |
291 | retval[j++] = vowels[idx2]; | |
292 | } | |
293 | } | |
294 | retval[j++] = 'x'; | |
295 | retval[j++] = '\0'; | |
296 | return retval; | |
297 | } | |
298 | ||
41b2f314 | 299 | char * |
cdd66111 | 300 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
3c0ef626 | 301 | { |
302 | char *retval = NULL; | |
303 | u_char *dgst_raw; | |
e9a17296 | 304 | u_int dgst_raw_len; |
305 | ||
3c0ef626 | 306 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
307 | if (!dgst_raw) | |
308 | fatal("key_fingerprint: null from key_fingerprint_raw()"); | |
e9a17296 | 309 | switch (dgst_rep) { |
3c0ef626 | 310 | case SSH_FP_HEX: |
311 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
312 | break; | |
313 | case SSH_FP_BUBBLEBABBLE: | |
314 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
315 | break; | |
316 | default: | |
317 | fatal("key_fingerprint_ex: bad digest representation %d", | |
318 | dgst_rep); | |
319 | break; | |
320 | } | |
321 | memset(dgst_raw, 0, dgst_raw_len); | |
322 | xfree(dgst_raw); | |
323 | return retval; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
328 | * the pointer. The integer must already be initialized. This function is | |
329 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
330 | * last processed (and maybe modified) character. Note that this may modify | |
331 | * the buffer containing the number. | |
332 | */ | |
333 | static int | |
334 | read_bignum(char **cpp, BIGNUM * value) | |
335 | { | |
336 | char *cp = *cpp; | |
337 | int old; | |
338 | ||
339 | /* Skip any leading whitespace. */ | |
340 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
341 | ; | |
342 | ||
343 | /* Check that it begins with a decimal digit. */ | |
344 | if (*cp < '0' || *cp > '9') | |
345 | return 0; | |
346 | ||
347 | /* Save starting position. */ | |
348 | *cpp = cp; | |
349 | ||
350 | /* Move forward until all decimal digits skipped. */ | |
351 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
352 | ; | |
353 | ||
354 | /* Save the old terminating character, and replace it by \0. */ | |
355 | old = *cp; | |
356 | *cp = 0; | |
357 | ||
358 | /* Parse the number. */ | |
359 | if (BN_dec2bn(&value, *cpp) == 0) | |
360 | return 0; | |
361 | ||
362 | /* Restore old terminating character. */ | |
363 | *cp = old; | |
364 | ||
365 | /* Move beyond the number and return success. */ | |
366 | *cpp = cp; | |
367 | return 1; | |
368 | } | |
680cee3b | 369 | |
3c0ef626 | 370 | static int |
371 | write_bignum(FILE *f, BIGNUM *num) | |
372 | { | |
373 | char *buf = BN_bn2dec(num); | |
374 | if (buf == NULL) { | |
375 | error("write_bignum: BN_bn2dec() failed"); | |
376 | return 0; | |
377 | } | |
378 | fprintf(f, " %s", buf); | |
379 | OPENSSL_free(buf); | |
380 | return 1; | |
381 | } | |
382 | ||
383 | /* returns 1 ok, -1 error */ | |
384 | int | |
385 | key_read(Key *ret, char **cpp) | |
386 | { | |
387 | Key *k; | |
388 | int success = -1; | |
389 | char *cp, *space; | |
390 | int len, n, type; | |
391 | u_int bits; | |
392 | u_char *blob; | |
393 | ||
394 | cp = *cpp; | |
395 | ||
e9a17296 | 396 | switch (ret->type) { |
3c0ef626 | 397 | case KEY_RSA1: |
398 | /* Get number of bits. */ | |
399 | if (*cp < '0' || *cp > '9') | |
400 | return -1; /* Bad bit count... */ | |
401 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) | |
402 | bits = 10 * bits + *cp - '0'; | |
403 | if (bits == 0) | |
404 | return -1; | |
405 | *cpp = cp; | |
406 | /* Get public exponent, public modulus. */ | |
407 | if (!read_bignum(cpp, ret->rsa->e)) | |
408 | return -1; | |
409 | if (!read_bignum(cpp, ret->rsa->n)) | |
410 | return -1; | |
411 | success = 1; | |
412 | break; | |
413 | case KEY_UNSPEC: | |
414 | case KEY_RSA: | |
415 | case KEY_DSA: | |
416 | space = strchr(cp, ' '); | |
417 | if (space == NULL) { | |
6a9b3198 | 418 | debug3("key_read: missing whitespace"); |
3c0ef626 | 419 | return -1; |
420 | } | |
421 | *space = '\0'; | |
422 | type = key_type_from_name(cp); | |
423 | *space = ' '; | |
424 | if (type == KEY_UNSPEC) { | |
6a9b3198 | 425 | debug3("key_read: missing keytype"); |
3c0ef626 | 426 | return -1; |
427 | } | |
428 | cp = space+1; | |
429 | if (*cp == '\0') { | |
430 | debug3("key_read: short string"); | |
431 | return -1; | |
432 | } | |
433 | if (ret->type == KEY_UNSPEC) { | |
434 | ret->type = type; | |
435 | } else if (ret->type != type) { | |
436 | /* is a key, but different type */ | |
437 | debug3("key_read: type mismatch"); | |
438 | return -1; | |
439 | } | |
440 | len = 2*strlen(cp); | |
441 | blob = xmalloc(len); | |
442 | n = uudecode(cp, blob, len); | |
443 | if (n < 0) { | |
444 | error("key_read: uudecode %s failed", cp); | |
e9a17296 | 445 | xfree(blob); |
3c0ef626 | 446 | return -1; |
447 | } | |
0fff78ff | 448 | k = key_from_blob(blob, (u_int)n); |
e9a17296 | 449 | xfree(blob); |
3c0ef626 | 450 | if (k == NULL) { |
451 | error("key_read: key_from_blob %s failed", cp); | |
452 | return -1; | |
453 | } | |
3c0ef626 | 454 | if (k->type != type) { |
455 | error("key_read: type mismatch: encoding error"); | |
456 | key_free(k); | |
457 | return -1; | |
458 | } | |
459 | /*XXXX*/ | |
460 | if (ret->type == KEY_RSA) { | |
461 | if (ret->rsa != NULL) | |
462 | RSA_free(ret->rsa); | |
463 | ret->rsa = k->rsa; | |
464 | k->rsa = NULL; | |
465 | success = 1; | |
466 | #ifdef DEBUG_PK | |
467 | RSA_print_fp(stderr, ret->rsa, 8); | |
468 | #endif | |
469 | } else { | |
470 | if (ret->dsa != NULL) | |
471 | DSA_free(ret->dsa); | |
472 | ret->dsa = k->dsa; | |
473 | k->dsa = NULL; | |
474 | success = 1; | |
475 | #ifdef DEBUG_PK | |
476 | DSA_print_fp(stderr, ret->dsa, 8); | |
477 | #endif | |
478 | } | |
479 | /*XXXX*/ | |
e9a17296 | 480 | key_free(k); |
3c0ef626 | 481 | if (success != 1) |
482 | break; | |
3c0ef626 | 483 | /* advance cp: skip whitespace and data */ |
484 | while (*cp == ' ' || *cp == '\t') | |
485 | cp++; | |
486 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
487 | cp++; | |
488 | *cpp = cp; | |
489 | break; | |
490 | default: | |
491 | fatal("key_read: bad key type: %d", ret->type); | |
492 | break; | |
493 | } | |
494 | return success; | |
495 | } | |
680cee3b | 496 | |
3c0ef626 | 497 | int |
cdd66111 | 498 | key_write(const Key *key, FILE *f) |
3c0ef626 | 499 | { |
e9a17296 | 500 | int n, success = 0; |
501 | u_int len, bits = 0; | |
41b2f314 | 502 | u_char *blob; |
503 | char *uu; | |
3c0ef626 | 504 | |
505 | if (key->type == KEY_RSA1 && key->rsa != NULL) { | |
506 | /* size of modulus 'n' */ | |
507 | bits = BN_num_bits(key->rsa->n); | |
508 | fprintf(f, "%u", bits); | |
509 | if (write_bignum(f, key->rsa->e) && | |
510 | write_bignum(f, key->rsa->n)) { | |
511 | success = 1; | |
512 | } else { | |
513 | error("key_write: failed for RSA key"); | |
514 | } | |
515 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || | |
516 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
3c0ef626 | 517 | key_to_blob(key, &blob, &len); |
518 | uu = xmalloc(2*len); | |
519 | n = uuencode(blob, len, uu, 2*len); | |
520 | if (n > 0) { | |
521 | fprintf(f, "%s %s", key_ssh_name(key), uu); | |
522 | success = 1; | |
523 | } | |
524 | xfree(blob); | |
525 | xfree(uu); | |
526 | } | |
527 | return success; | |
528 | } | |
680cee3b | 529 | |
cdd66111 | 530 | const char * |
531 | key_type(const Key *k) | |
3c0ef626 | 532 | { |
533 | switch (k->type) { | |
534 | case KEY_RSA1: | |
535 | return "RSA1"; | |
3c0ef626 | 536 | case KEY_RSA: |
537 | return "RSA"; | |
3c0ef626 | 538 | case KEY_DSA: |
539 | return "DSA"; | |
3c0ef626 | 540 | } |
541 | return "unknown"; | |
542 | } | |
680cee3b | 543 | |
cdd66111 | 544 | const char * |
545 | key_ssh_name(const Key *k) | |
3c0ef626 | 546 | { |
547 | switch (k->type) { | |
548 | case KEY_RSA: | |
549 | return "ssh-rsa"; | |
3c0ef626 | 550 | case KEY_DSA: |
551 | return "ssh-dss"; | |
3c0ef626 | 552 | } |
553 | return "ssh-unknown"; | |
554 | } | |
680cee3b | 555 | |
3c0ef626 | 556 | u_int |
cdd66111 | 557 | key_size(const Key *k) |
e9a17296 | 558 | { |
3c0ef626 | 559 | switch (k->type) { |
560 | case KEY_RSA1: | |
561 | case KEY_RSA: | |
562 | return BN_num_bits(k->rsa->n); | |
3c0ef626 | 563 | case KEY_DSA: |
564 | return BN_num_bits(k->dsa->p); | |
3c0ef626 | 565 | } |
566 | return 0; | |
567 | } | |
568 | ||
569 | static RSA * | |
570 | rsa_generate_private_key(u_int bits) | |
571 | { | |
572 | RSA *private; | |
9108f8d9 | 573 | |
3c0ef626 | 574 | private = RSA_generate_key(bits, 35, NULL, NULL); |
575 | if (private == NULL) | |
576 | fatal("rsa_generate_private_key: key generation failed."); | |
577 | return private; | |
578 | } | |
579 | ||
580 | static DSA* | |
581 | dsa_generate_private_key(u_int bits) | |
582 | { | |
583 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
9108f8d9 | 584 | |
3c0ef626 | 585 | if (private == NULL) |
586 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
587 | if (!DSA_generate_key(private)) | |
588 | fatal("dsa_generate_private_key: DSA_generate_key failed."); | |
589 | if (private == NULL) | |
590 | fatal("dsa_generate_private_key: NULL."); | |
591 | return private; | |
592 | } | |
593 | ||
594 | Key * | |
595 | key_generate(int type, u_int bits) | |
596 | { | |
597 | Key *k = key_new(KEY_UNSPEC); | |
598 | switch (type) { | |
599 | case KEY_DSA: | |
600 | k->dsa = dsa_generate_private_key(bits); | |
601 | break; | |
602 | case KEY_RSA: | |
603 | case KEY_RSA1: | |
604 | k->rsa = rsa_generate_private_key(bits); | |
605 | break; | |
606 | default: | |
607 | fatal("key_generate: unknown type %d", type); | |
608 | } | |
609 | k->type = type; | |
610 | return k; | |
611 | } | |
612 | ||
613 | Key * | |
cdd66111 | 614 | key_from_private(const Key *k) |
3c0ef626 | 615 | { |
616 | Key *n = NULL; | |
617 | switch (k->type) { | |
618 | case KEY_DSA: | |
619 | n = key_new(k->type); | |
ff7ec503 | 620 | if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
621 | (BN_copy(n->dsa->q, k->dsa->q) == NULL) || | |
622 | (BN_copy(n->dsa->g, k->dsa->g) == NULL) || | |
623 | (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) | |
624 | fatal("key_from_private: BN_copy failed"); | |
3c0ef626 | 625 | break; |
626 | case KEY_RSA: | |
627 | case KEY_RSA1: | |
628 | n = key_new(k->type); | |
ff7ec503 | 629 | if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
630 | (BN_copy(n->rsa->e, k->rsa->e) == NULL)) | |
631 | fatal("key_from_private: BN_copy failed"); | |
3c0ef626 | 632 | break; |
633 | default: | |
634 | fatal("key_from_private: unknown type %d", k->type); | |
635 | break; | |
636 | } | |
637 | return n; | |
638 | } | |
639 | ||
640 | int | |
641 | key_type_from_name(char *name) | |
642 | { | |
e9a17296 | 643 | if (strcmp(name, "rsa1") == 0) { |
3c0ef626 | 644 | return KEY_RSA1; |
e9a17296 | 645 | } else if (strcmp(name, "rsa") == 0) { |
3c0ef626 | 646 | return KEY_RSA; |
e9a17296 | 647 | } else if (strcmp(name, "dsa") == 0) { |
3c0ef626 | 648 | return KEY_DSA; |
e9a17296 | 649 | } else if (strcmp(name, "ssh-rsa") == 0) { |
3c0ef626 | 650 | return KEY_RSA; |
e9a17296 | 651 | } else if (strcmp(name, "ssh-dss") == 0) { |
3c0ef626 | 652 | return KEY_DSA; |
653 | } | |
654 | debug2("key_type_from_name: unknown key type '%s'", name); | |
655 | return KEY_UNSPEC; | |
656 | } | |
657 | ||
658 | int | |
659 | key_names_valid2(const char *names) | |
660 | { | |
661 | char *s, *cp, *p; | |
662 | ||
663 | if (names == NULL || strcmp(names, "") == 0) | |
664 | return 0; | |
665 | s = cp = xstrdup(names); | |
666 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
e9a17296 | 667 | (p = strsep(&cp, ","))) { |
3c0ef626 | 668 | switch (key_type_from_name(p)) { |
669 | case KEY_RSA1: | |
670 | case KEY_UNSPEC: | |
671 | xfree(s); | |
672 | return 0; | |
673 | } | |
674 | } | |
675 | debug3("key names ok: [%s]", names); | |
676 | xfree(s); | |
677 | return 1; | |
678 | } | |
679 | ||
680 | Key * | |
cdd66111 | 681 | key_from_blob(const u_char *blob, u_int blen) |
3c0ef626 | 682 | { |
683 | Buffer b; | |
3c0ef626 | 684 | int rlen, type; |
996d5e62 | 685 | char *ktype = NULL; |
3c0ef626 | 686 | Key *key = NULL; |
687 | ||
688 | #ifdef DEBUG_PK | |
689 | dump_base64(stderr, blob, blen); | |
690 | #endif | |
691 | buffer_init(&b); | |
692 | buffer_append(&b, blob, blen); | |
996d5e62 | 693 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
694 | error("key_from_blob: can't read key type"); | |
695 | goto out; | |
696 | } | |
697 | ||
3c0ef626 | 698 | type = key_type_from_name(ktype); |
699 | ||
e9a17296 | 700 | switch (type) { |
3c0ef626 | 701 | case KEY_RSA: |
702 | key = key_new(type); | |
996d5e62 | 703 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
704 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
705 | error("key_from_blob: can't read rsa key"); | |
706 | key_free(key); | |
707 | key = NULL; | |
708 | goto out; | |
709 | } | |
3c0ef626 | 710 | #ifdef DEBUG_PK |
711 | RSA_print_fp(stderr, key->rsa, 8); | |
712 | #endif | |
713 | break; | |
714 | case KEY_DSA: | |
715 | key = key_new(type); | |
996d5e62 | 716 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
717 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
718 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
719 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
720 | error("key_from_blob: can't read dsa key"); | |
721 | key_free(key); | |
722 | key = NULL; | |
723 | goto out; | |
724 | } | |
3c0ef626 | 725 | #ifdef DEBUG_PK |
726 | DSA_print_fp(stderr, key->dsa, 8); | |
727 | #endif | |
728 | break; | |
729 | case KEY_UNSPEC: | |
730 | key = key_new(type); | |
731 | break; | |
732 | default: | |
733 | error("key_from_blob: cannot handle type %s", ktype); | |
996d5e62 | 734 | goto out; |
3c0ef626 | 735 | } |
736 | rlen = buffer_len(&b); | |
737 | if (key != NULL && rlen != 0) | |
738 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
996d5e62 | 739 | out: |
740 | if (ktype != NULL) | |
741 | xfree(ktype); | |
3c0ef626 | 742 | buffer_free(&b); |
743 | return key; | |
744 | } | |
745 | ||
746 | int | |
cdd66111 | 747 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
3c0ef626 | 748 | { |
749 | Buffer b; | |
750 | int len; | |
3c0ef626 | 751 | |
752 | if (key == NULL) { | |
753 | error("key_to_blob: key == NULL"); | |
754 | return 0; | |
755 | } | |
756 | buffer_init(&b); | |
e9a17296 | 757 | switch (key->type) { |
3c0ef626 | 758 | case KEY_DSA: |
759 | buffer_put_cstring(&b, key_ssh_name(key)); | |
760 | buffer_put_bignum2(&b, key->dsa->p); | |
761 | buffer_put_bignum2(&b, key->dsa->q); | |
762 | buffer_put_bignum2(&b, key->dsa->g); | |
763 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
764 | break; | |
765 | case KEY_RSA: | |
766 | buffer_put_cstring(&b, key_ssh_name(key)); | |
767 | buffer_put_bignum2(&b, key->rsa->e); | |
768 | buffer_put_bignum2(&b, key->rsa->n); | |
769 | break; | |
770 | default: | |
771 | error("key_to_blob: unsupported key type %d", key->type); | |
772 | buffer_free(&b); | |
773 | return 0; | |
774 | } | |
775 | len = buffer_len(&b); | |
3c0ef626 | 776 | if (lenp != NULL) |
777 | *lenp = len; | |
41b2f314 | 778 | if (blobp != NULL) { |
779 | *blobp = xmalloc(len); | |
780 | memcpy(*blobp, buffer_ptr(&b), len); | |
781 | } | |
782 | memset(buffer_ptr(&b), 0, len); | |
783 | buffer_free(&b); | |
3c0ef626 | 784 | return len; |
785 | } | |
786 | ||
787 | int | |
788 | key_sign( | |
cdd66111 | 789 | const Key *key, |
e9a17296 | 790 | u_char **sigp, u_int *lenp, |
cdd66111 | 791 | const u_char *data, u_int datalen) |
3c0ef626 | 792 | { |
e9a17296 | 793 | switch (key->type) { |
3c0ef626 | 794 | case KEY_DSA: |
795 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
3c0ef626 | 796 | case KEY_RSA: |
797 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
3c0ef626 | 798 | default: |
c9f39d2c | 799 | error("key_sign: invalid key type %d", key->type); |
3c0ef626 | 800 | return -1; |
3c0ef626 | 801 | } |
802 | } | |
803 | ||
f5799ae1 | 804 | /* |
805 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
806 | * and -1 on error. | |
807 | */ | |
3c0ef626 | 808 | int |
809 | key_verify( | |
cdd66111 | 810 | const Key *key, |
811 | const u_char *signature, u_int signaturelen, | |
812 | const u_char *data, u_int datalen) | |
3c0ef626 | 813 | { |
814 | if (signaturelen == 0) | |
815 | return -1; | |
816 | ||
e9a17296 | 817 | switch (key->type) { |
3c0ef626 | 818 | case KEY_DSA: |
819 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
3c0ef626 | 820 | case KEY_RSA: |
821 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
3c0ef626 | 822 | default: |
c9f39d2c | 823 | error("key_verify: invalid key type %d", key->type); |
3c0ef626 | 824 | return -1; |
3c0ef626 | 825 | } |
826 | } | |
700318f3 | 827 | |
828 | /* Converts a private to a public key */ | |
700318f3 | 829 | Key * |
cdd66111 | 830 | key_demote(const Key *k) |
700318f3 | 831 | { |
832 | Key *pk; | |
833 | ||
9108f8d9 | 834 | pk = xcalloc(1, sizeof(*pk)); |
700318f3 | 835 | pk->type = k->type; |
836 | pk->flags = k->flags; | |
837 | pk->dsa = NULL; | |
838 | pk->rsa = NULL; | |
839 | ||
840 | switch (k->type) { | |
841 | case KEY_RSA1: | |
842 | case KEY_RSA: | |
843 | if ((pk->rsa = RSA_new()) == NULL) | |
844 | fatal("key_demote: RSA_new failed"); | |
845 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
846 | fatal("key_demote: BN_dup failed"); | |
847 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
848 | fatal("key_demote: BN_dup failed"); | |
849 | break; | |
850 | case KEY_DSA: | |
851 | if ((pk->dsa = DSA_new()) == NULL) | |
852 | fatal("key_demote: DSA_new failed"); | |
853 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
854 | fatal("key_demote: BN_dup failed"); | |
855 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
856 | fatal("key_demote: BN_dup failed"); | |
857 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
858 | fatal("key_demote: BN_dup failed"); | |
859 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
860 | fatal("key_demote: BN_dup failed"); | |
861 | break; | |
862 | default: | |
863 | fatal("key_free: bad key type %d", k->type); | |
864 | break; | |
865 | } | |
866 | ||
867 | return (pk); | |
868 | } |