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Commit | Line | Data |
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4fe2af09 | 1 | /* |
bcbf86ec | 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 | * | |
a96070d4 | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
4fe2af09 | 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. | |
4fe2af09 | 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 | */ | |
4fe2af09 | 34 | #include "includes.h" |
6aacefa7 | 35 | RCSID("$OpenBSD: key.c,v 1.35 2001/12/05 10:06:12 deraadt Exp $"); |
42f11eb2 | 36 | |
4fe2af09 | 37 | #include <openssl/evp.h> |
42f11eb2 | 38 | |
4fe2af09 | 39 | #include "xmalloc.h" |
40 | #include "key.h" | |
fa08c86b | 41 | #include "rsa.h" |
42 | #include "ssh-dss.h" | |
43 | #include "ssh-rsa.h" | |
a306f2dd | 44 | #include "uuencode.h" |
fa08c86b | 45 | #include "buffer.h" |
46 | #include "bufaux.h" | |
42f11eb2 | 47 | #include "log.h" |
4fe2af09 | 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; | |
383546c4 | 57 | k->flags = 0; |
a306f2dd | 58 | k->dsa = NULL; |
59 | k->rsa = NULL; | |
4fe2af09 | 60 | switch (k->type) { |
fa08c86b | 61 | case KEY_RSA1: |
4fe2af09 | 62 | case KEY_RSA: |
63 | rsa = RSA_new(); | |
64 | rsa->n = BN_new(); | |
65 | rsa->e = BN_new(); | |
66 | k->rsa = rsa; | |
67 | break; | |
68 | case KEY_DSA: | |
69 | dsa = DSA_new(); | |
70 | dsa->p = BN_new(); | |
71 | dsa->q = BN_new(); | |
72 | dsa->g = BN_new(); | |
73 | dsa->pub_key = BN_new(); | |
74 | k->dsa = dsa; | |
75 | break; | |
fa08c86b | 76 | case KEY_UNSPEC: |
4fe2af09 | 77 | break; |
78 | default: | |
79 | fatal("key_new: bad key type %d", k->type); | |
80 | break; | |
81 | } | |
82 | return k; | |
83 | } | |
fa08c86b | 84 | Key * |
85 | key_new_private(int type) | |
86 | { | |
87 | Key *k = key_new(type); | |
88 | switch (k->type) { | |
89 | case KEY_RSA1: | |
90 | case KEY_RSA: | |
91 | k->rsa->d = BN_new(); | |
92 | k->rsa->iqmp = BN_new(); | |
93 | k->rsa->q = BN_new(); | |
94 | k->rsa->p = BN_new(); | |
95 | k->rsa->dmq1 = BN_new(); | |
96 | k->rsa->dmp1 = BN_new(); | |
97 | break; | |
98 | case KEY_DSA: | |
99 | k->dsa->priv_key = BN_new(); | |
100 | break; | |
101 | case KEY_UNSPEC: | |
102 | break; | |
103 | default: | |
104 | break; | |
105 | } | |
106 | return k; | |
107 | } | |
4fe2af09 | 108 | void |
109 | key_free(Key *k) | |
110 | { | |
111 | switch (k->type) { | |
fa08c86b | 112 | case KEY_RSA1: |
4fe2af09 | 113 | case KEY_RSA: |
114 | if (k->rsa != NULL) | |
115 | RSA_free(k->rsa); | |
116 | k->rsa = NULL; | |
117 | break; | |
118 | case KEY_DSA: | |
119 | if (k->dsa != NULL) | |
120 | DSA_free(k->dsa); | |
121 | k->dsa = NULL; | |
122 | break; | |
fa08c86b | 123 | case KEY_UNSPEC: |
124 | break; | |
4fe2af09 | 125 | default: |
126 | fatal("key_free: bad key type %d", k->type); | |
127 | break; | |
128 | } | |
129 | xfree(k); | |
130 | } | |
131 | int | |
132 | key_equal(Key *a, Key *b) | |
133 | { | |
134 | if (a == NULL || b == NULL || a->type != b->type) | |
135 | return 0; | |
136 | switch (a->type) { | |
fa08c86b | 137 | case KEY_RSA1: |
4fe2af09 | 138 | case KEY_RSA: |
139 | return a->rsa != NULL && b->rsa != NULL && | |
140 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
141 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
142 | break; | |
143 | case KEY_DSA: | |
144 | return a->dsa != NULL && b->dsa != NULL && | |
145 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
146 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
147 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
148 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
149 | break; | |
150 | default: | |
a306f2dd | 151 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 152 | break; |
153 | } | |
154 | return 0; | |
155 | } | |
156 | ||
396c147e | 157 | static u_char* |
301e8e5b | 158 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length) |
4fe2af09 | 159 | { |
79c9ac1b | 160 | EVP_MD *md = NULL; |
161 | EVP_MD_CTX ctx; | |
1e3b8b07 | 162 | u_char *blob = NULL; |
301e8e5b | 163 | u_char *retval = NULL; |
4fe2af09 | 164 | int len = 0; |
a306f2dd | 165 | int nlen, elen; |
4fe2af09 | 166 | |
301e8e5b | 167 | *dgst_raw_length = 0; |
168 | ||
79c9ac1b | 169 | switch (dgst_type) { |
170 | case SSH_FP_MD5: | |
171 | md = EVP_md5(); | |
172 | break; | |
173 | case SSH_FP_SHA1: | |
174 | md = EVP_sha1(); | |
175 | break; | |
176 | default: | |
177 | fatal("key_fingerprint_raw: bad digest type %d", | |
178 | dgst_type); | |
179 | } | |
4fe2af09 | 180 | switch (k->type) { |
fa08c86b | 181 | case KEY_RSA1: |
4fe2af09 | 182 | nlen = BN_num_bytes(k->rsa->n); |
183 | elen = BN_num_bytes(k->rsa->e); | |
184 | len = nlen + elen; | |
a306f2dd | 185 | blob = xmalloc(len); |
186 | BN_bn2bin(k->rsa->n, blob); | |
187 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 188 | break; |
189 | case KEY_DSA: | |
fa08c86b | 190 | case KEY_RSA: |
191 | key_to_blob(k, &blob, &len); | |
192 | break; | |
193 | case KEY_UNSPEC: | |
194 | return retval; | |
4fe2af09 | 195 | break; |
196 | default: | |
301e8e5b | 197 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 198 | break; |
199 | } | |
a306f2dd | 200 | if (blob != NULL) { |
301e8e5b | 201 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 202 | EVP_DigestInit(&ctx, md); |
203 | EVP_DigestUpdate(&ctx, blob, len); | |
301e8e5b | 204 | EVP_DigestFinal(&ctx, retval, NULL); |
205 | *dgst_raw_length = md->md_size; | |
a306f2dd | 206 | memset(blob, 0, len); |
207 | xfree(blob); | |
301e8e5b | 208 | } else { |
209 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 210 | } |
211 | return retval; | |
212 | } | |
213 | ||
396c147e | 214 | static char* |
cd332296 | 215 | key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) |
301e8e5b | 216 | { |
217 | char *retval; | |
218 | int i; | |
219 | ||
a88b7b57 | 220 | retval = xmalloc(dgst_raw_len * 3 + 1); |
301e8e5b | 221 | retval[0] = '\0'; |
222 | for(i = 0; i < dgst_raw_len; i++) { | |
223 | char hex[4]; | |
224 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
225 | strlcat(retval, hex, dgst_raw_len * 3); | |
226 | } | |
227 | retval[(dgst_raw_len * 3) - 1] = '\0'; | |
228 | return retval; | |
229 | } | |
230 | ||
396c147e | 231 | static char* |
cd332296 | 232 | key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) |
301e8e5b | 233 | { |
234 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
235 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
236 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 237 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 238 | char *retval; |
239 | ||
240 | rounds = (dgst_raw_len / 2) + 1; | |
241 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
08345971 | 242 | retval[j++] = 'x'; |
243 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 244 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 245 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
246 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 247 | seed) % 6; |
08345971 | 248 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
249 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 250 | (seed / 6)) % 6; |
08345971 | 251 | retval[j++] = vowels[idx0]; |
252 | retval[j++] = consonants[idx1]; | |
253 | retval[j++] = vowels[idx2]; | |
254 | if ((i + 1) < rounds) { | |
255 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
256 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
257 | retval[j++] = consonants[idx3]; | |
258 | retval[j++] = '-'; | |
259 | retval[j++] = consonants[idx4]; | |
301e8e5b | 260 | seed = ((seed * 5) + |
08345971 | 261 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
262 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 263 | } |
264 | } else { | |
265 | idx0 = seed % 6; | |
266 | idx1 = 16; | |
267 | idx2 = seed / 6; | |
08345971 | 268 | retval[j++] = vowels[idx0]; |
269 | retval[j++] = consonants[idx1]; | |
270 | retval[j++] = vowels[idx2]; | |
301e8e5b | 271 | } |
272 | } | |
08345971 | 273 | retval[j++] = 'x'; |
274 | retval[j++] = '\0'; | |
301e8e5b | 275 | return retval; |
276 | } | |
277 | ||
278 | char* | |
22138a36 | 279 | key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 280 | { |
cd332296 | 281 | char *retval = NULL; |
301e8e5b | 282 | u_char *dgst_raw; |
cd332296 | 283 | size_t dgst_raw_len; |
301e8e5b | 284 | |
285 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); | |
286 | if (!dgst_raw) | |
22138a36 | 287 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 288 | switch (dgst_rep) { |
301e8e5b | 289 | case SSH_FP_HEX: |
290 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
291 | break; | |
292 | case SSH_FP_BUBBLEBABBLE: | |
293 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
294 | break; | |
295 | default: | |
296 | fatal("key_fingerprint_ex: bad digest representation %d", | |
297 | dgst_rep); | |
298 | break; | |
299 | } | |
300 | memset(dgst_raw, 0, dgst_raw_len); | |
301 | xfree(dgst_raw); | |
302 | return retval; | |
303 | } | |
304 | ||
4fe2af09 | 305 | /* |
306 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
307 | * the pointer. The integer must already be initialized. This function is | |
308 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
309 | * last processed (and maybe modified) character. Note that this may modify | |
310 | * the buffer containing the number. | |
311 | */ | |
396c147e | 312 | static int |
4fe2af09 | 313 | read_bignum(char **cpp, BIGNUM * value) |
314 | { | |
315 | char *cp = *cpp; | |
316 | int old; | |
317 | ||
318 | /* Skip any leading whitespace. */ | |
319 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
320 | ; | |
321 | ||
322 | /* Check that it begins with a decimal digit. */ | |
323 | if (*cp < '0' || *cp > '9') | |
324 | return 0; | |
325 | ||
326 | /* Save starting position. */ | |
327 | *cpp = cp; | |
328 | ||
329 | /* Move forward until all decimal digits skipped. */ | |
330 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
331 | ; | |
332 | ||
333 | /* Save the old terminating character, and replace it by \0. */ | |
334 | old = *cp; | |
335 | *cp = 0; | |
336 | ||
337 | /* Parse the number. */ | |
338 | if (BN_dec2bn(&value, *cpp) == 0) | |
339 | return 0; | |
340 | ||
341 | /* Restore old terminating character. */ | |
342 | *cp = old; | |
343 | ||
344 | /* Move beyond the number and return success. */ | |
345 | *cpp = cp; | |
346 | return 1; | |
347 | } | |
396c147e | 348 | static int |
4fe2af09 | 349 | write_bignum(FILE *f, BIGNUM *num) |
350 | { | |
351 | char *buf = BN_bn2dec(num); | |
352 | if (buf == NULL) { | |
353 | error("write_bignum: BN_bn2dec() failed"); | |
354 | return 0; | |
355 | } | |
356 | fprintf(f, " %s", buf); | |
c48c32c1 | 357 | OPENSSL_free(buf); |
4fe2af09 | 358 | return 1; |
359 | } | |
fa08c86b | 360 | |
cb8c7bad | 361 | /* returns 1 ok, -1 error */ |
fa08c86b | 362 | int |
a306f2dd | 363 | key_read(Key *ret, char **cpp) |
4fe2af09 | 364 | { |
a306f2dd | 365 | Key *k; |
fa08c86b | 366 | int success = -1; |
367 | char *cp, *space; | |
368 | int len, n, type; | |
369 | u_int bits; | |
1e3b8b07 | 370 | u_char *blob; |
a306f2dd | 371 | |
372 | cp = *cpp; | |
373 | ||
6aacefa7 | 374 | switch (ret->type) { |
fa08c86b | 375 | case KEY_RSA1: |
a306f2dd | 376 | /* Get number of bits. */ |
377 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 378 | return -1; /* Bad bit count... */ |
a306f2dd | 379 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
380 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 381 | if (bits == 0) |
fa08c86b | 382 | return -1; |
a306f2dd | 383 | *cpp = cp; |
4fe2af09 | 384 | /* Get public exponent, public modulus. */ |
385 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 386 | return -1; |
4fe2af09 | 387 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 388 | return -1; |
389 | success = 1; | |
4fe2af09 | 390 | break; |
fa08c86b | 391 | case KEY_UNSPEC: |
392 | case KEY_RSA: | |
4fe2af09 | 393 | case KEY_DSA: |
fa08c86b | 394 | space = strchr(cp, ' '); |
395 | if (space == NULL) { | |
396 | debug3("key_read: no space"); | |
397 | return -1; | |
398 | } | |
399 | *space = '\0'; | |
400 | type = key_type_from_name(cp); | |
401 | *space = ' '; | |
402 | if (type == KEY_UNSPEC) { | |
403 | debug3("key_read: no key found"); | |
404 | return -1; | |
405 | } | |
406 | cp = space+1; | |
407 | if (*cp == '\0') { | |
408 | debug3("key_read: short string"); | |
409 | return -1; | |
410 | } | |
411 | if (ret->type == KEY_UNSPEC) { | |
412 | ret->type = type; | |
413 | } else if (ret->type != type) { | |
414 | /* is a key, but different type */ | |
415 | debug3("key_read: type mismatch"); | |
cb8c7bad | 416 | return -1; |
fa08c86b | 417 | } |
a306f2dd | 418 | len = 2*strlen(cp); |
419 | blob = xmalloc(len); | |
420 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 421 | if (n < 0) { |
71276795 | 422 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 423 | xfree(blob); |
fa08c86b | 424 | return -1; |
1d1ffb87 | 425 | } |
fa08c86b | 426 | k = key_from_blob(blob, n); |
2f98d223 | 427 | xfree(blob); |
71276795 | 428 | if (k == NULL) { |
fa08c86b | 429 | error("key_read: key_from_blob %s failed", cp); |
430 | return -1; | |
71276795 | 431 | } |
fa08c86b | 432 | if (k->type != type) { |
433 | error("key_read: type mismatch: encoding error"); | |
434 | key_free(k); | |
435 | return -1; | |
436 | } | |
437 | /*XXXX*/ | |
438 | if (ret->type == KEY_RSA) { | |
439 | if (ret->rsa != NULL) | |
440 | RSA_free(ret->rsa); | |
441 | ret->rsa = k->rsa; | |
442 | k->rsa = NULL; | |
443 | success = 1; | |
444 | #ifdef DEBUG_PK | |
445 | RSA_print_fp(stderr, ret->rsa, 8); | |
446 | #endif | |
447 | } else { | |
448 | if (ret->dsa != NULL) | |
449 | DSA_free(ret->dsa); | |
450 | ret->dsa = k->dsa; | |
451 | k->dsa = NULL; | |
452 | success = 1; | |
453 | #ifdef DEBUG_PK | |
454 | DSA_print_fp(stderr, ret->dsa, 8); | |
455 | #endif | |
456 | } | |
457 | /*XXXX*/ | |
2f98d223 | 458 | key_free(k); |
fa08c86b | 459 | if (success != 1) |
460 | break; | |
71276795 | 461 | /* advance cp: skip whitespace and data */ |
462 | while (*cp == ' ' || *cp == '\t') | |
463 | cp++; | |
464 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
465 | cp++; | |
466 | *cpp = cp; | |
4fe2af09 | 467 | break; |
468 | default: | |
a306f2dd | 469 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 470 | break; |
471 | } | |
fa08c86b | 472 | return success; |
4fe2af09 | 473 | } |
474 | int | |
475 | key_write(Key *key, FILE *f) | |
476 | { | |
477 | int success = 0; | |
1e3b8b07 | 478 | u_int bits = 0; |
4fe2af09 | 479 | |
fa08c86b | 480 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 481 | /* size of modulus 'n' */ |
482 | bits = BN_num_bits(key->rsa->n); | |
483 | fprintf(f, "%u", bits); | |
484 | if (write_bignum(f, key->rsa->e) && | |
485 | write_bignum(f, key->rsa->n)) { | |
486 | success = 1; | |
487 | } else { | |
488 | error("key_write: failed for RSA key"); | |
489 | } | |
fa08c86b | 490 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
491 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
a306f2dd | 492 | int len, n; |
1e3b8b07 | 493 | u_char *blob, *uu; |
fa08c86b | 494 | key_to_blob(key, &blob, &len); |
a306f2dd | 495 | uu = xmalloc(2*len); |
1d1ffb87 | 496 | n = uuencode(blob, len, uu, 2*len); |
497 | if (n > 0) { | |
fa08c86b | 498 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 499 | success = 1; |
500 | } | |
a306f2dd | 501 | xfree(blob); |
502 | xfree(uu); | |
4fe2af09 | 503 | } |
504 | return success; | |
505 | } | |
1d1ffb87 | 506 | char * |
507 | key_type(Key *k) | |
508 | { | |
509 | switch (k->type) { | |
fa08c86b | 510 | case KEY_RSA1: |
511 | return "RSA1"; | |
512 | break; | |
1d1ffb87 | 513 | case KEY_RSA: |
514 | return "RSA"; | |
515 | break; | |
516 | case KEY_DSA: | |
517 | return "DSA"; | |
518 | break; | |
519 | } | |
520 | return "unknown"; | |
521 | } | |
fa08c86b | 522 | char * |
523 | key_ssh_name(Key *k) | |
524 | { | |
525 | switch (k->type) { | |
526 | case KEY_RSA: | |
527 | return "ssh-rsa"; | |
528 | break; | |
529 | case KEY_DSA: | |
530 | return "ssh-dss"; | |
531 | break; | |
532 | } | |
533 | return "ssh-unknown"; | |
534 | } | |
535 | u_int | |
6aacefa7 | 536 | key_size(Key *k) |
537 | { | |
2e73a022 | 538 | switch (k->type) { |
fa08c86b | 539 | case KEY_RSA1: |
2e73a022 | 540 | case KEY_RSA: |
541 | return BN_num_bits(k->rsa->n); | |
542 | break; | |
543 | case KEY_DSA: | |
544 | return BN_num_bits(k->dsa->p); | |
545 | break; | |
546 | } | |
547 | return 0; | |
548 | } | |
fa08c86b | 549 | |
396c147e | 550 | static RSA * |
1e3b8b07 | 551 | rsa_generate_private_key(u_int bits) |
fa08c86b | 552 | { |
2b87da3b | 553 | RSA *private; |
554 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
555 | if (private == NULL) | |
556 | fatal("rsa_generate_private_key: key generation failed."); | |
557 | return private; | |
fa08c86b | 558 | } |
559 | ||
396c147e | 560 | static DSA* |
1e3b8b07 | 561 | dsa_generate_private_key(u_int bits) |
fa08c86b | 562 | { |
563 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
564 | if (private == NULL) | |
565 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
566 | if (!DSA_generate_key(private)) | |
2b87da3b | 567 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
568 | if (private == NULL) | |
569 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 570 | return private; |
571 | } | |
572 | ||
573 | Key * | |
1e3b8b07 | 574 | key_generate(int type, u_int bits) |
fa08c86b | 575 | { |
576 | Key *k = key_new(KEY_UNSPEC); | |
577 | switch (type) { | |
2b87da3b | 578 | case KEY_DSA: |
fa08c86b | 579 | k->dsa = dsa_generate_private_key(bits); |
580 | break; | |
581 | case KEY_RSA: | |
582 | case KEY_RSA1: | |
583 | k->rsa = rsa_generate_private_key(bits); | |
584 | break; | |
585 | default: | |
2b87da3b | 586 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 587 | } |
2b87da3b | 588 | k->type = type; |
fa08c86b | 589 | return k; |
590 | } | |
591 | ||
592 | Key * | |
593 | key_from_private(Key *k) | |
594 | { | |
595 | Key *n = NULL; | |
596 | switch (k->type) { | |
2b87da3b | 597 | case KEY_DSA: |
fa08c86b | 598 | n = key_new(k->type); |
599 | BN_copy(n->dsa->p, k->dsa->p); | |
600 | BN_copy(n->dsa->q, k->dsa->q); | |
601 | BN_copy(n->dsa->g, k->dsa->g); | |
602 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
603 | break; | |
604 | case KEY_RSA: | |
605 | case KEY_RSA1: | |
606 | n = key_new(k->type); | |
607 | BN_copy(n->rsa->n, k->rsa->n); | |
608 | BN_copy(n->rsa->e, k->rsa->e); | |
609 | break; | |
610 | default: | |
2b87da3b | 611 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 612 | break; |
613 | } | |
614 | return n; | |
615 | } | |
616 | ||
617 | int | |
618 | key_type_from_name(char *name) | |
619 | { | |
6aacefa7 | 620 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 621 | return KEY_RSA1; |
6aacefa7 | 622 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 623 | return KEY_RSA; |
6aacefa7 | 624 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 625 | return KEY_DSA; |
6aacefa7 | 626 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 627 | return KEY_RSA; |
6aacefa7 | 628 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 629 | return KEY_DSA; |
630 | } | |
539af7f5 | 631 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 632 | return KEY_UNSPEC; |
633 | } | |
634 | ||
e961a8f9 | 635 | int |
636 | key_names_valid2(const char *names) | |
637 | { | |
638 | char *s, *cp, *p; | |
639 | ||
640 | if (names == NULL || strcmp(names, "") == 0) | |
641 | return 0; | |
642 | s = cp = xstrdup(names); | |
643 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
644 | (p = strsep(&cp, ","))) { | |
645 | switch (key_type_from_name(p)) { | |
646 | case KEY_RSA1: | |
647 | case KEY_UNSPEC: | |
648 | xfree(s); | |
649 | return 0; | |
650 | } | |
651 | } | |
652 | debug3("key names ok: [%s]", names); | |
653 | xfree(s); | |
654 | return 1; | |
655 | } | |
656 | ||
fa08c86b | 657 | Key * |
cf54363d | 658 | key_from_blob(u_char *blob, int blen) |
fa08c86b | 659 | { |
660 | Buffer b; | |
661 | char *ktype; | |
662 | int rlen, type; | |
663 | Key *key = NULL; | |
664 | ||
665 | #ifdef DEBUG_PK | |
666 | dump_base64(stderr, blob, blen); | |
667 | #endif | |
668 | buffer_init(&b); | |
669 | buffer_append(&b, blob, blen); | |
670 | ktype = buffer_get_string(&b, NULL); | |
671 | type = key_type_from_name(ktype); | |
672 | ||
6aacefa7 | 673 | switch (type) { |
fa08c86b | 674 | case KEY_RSA: |
675 | key = key_new(type); | |
fa08c86b | 676 | buffer_get_bignum2(&b, key->rsa->e); |
b5c334cc | 677 | buffer_get_bignum2(&b, key->rsa->n); |
fa08c86b | 678 | #ifdef DEBUG_PK |
679 | RSA_print_fp(stderr, key->rsa, 8); | |
680 | #endif | |
681 | break; | |
682 | case KEY_DSA: | |
683 | key = key_new(type); | |
684 | buffer_get_bignum2(&b, key->dsa->p); | |
685 | buffer_get_bignum2(&b, key->dsa->q); | |
686 | buffer_get_bignum2(&b, key->dsa->g); | |
687 | buffer_get_bignum2(&b, key->dsa->pub_key); | |
688 | #ifdef DEBUG_PK | |
689 | DSA_print_fp(stderr, key->dsa, 8); | |
690 | #endif | |
691 | break; | |
692 | case KEY_UNSPEC: | |
693 | key = key_new(type); | |
694 | break; | |
695 | default: | |
696 | error("key_from_blob: cannot handle type %s", ktype); | |
697 | break; | |
698 | } | |
699 | rlen = buffer_len(&b); | |
700 | if (key != NULL && rlen != 0) | |
701 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
702 | xfree(ktype); | |
703 | buffer_free(&b); | |
704 | return key; | |
705 | } | |
706 | ||
707 | int | |
1e3b8b07 | 708 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 709 | { |
710 | Buffer b; | |
711 | int len; | |
1e3b8b07 | 712 | u_char *buf; |
fa08c86b | 713 | |
714 | if (key == NULL) { | |
715 | error("key_to_blob: key == NULL"); | |
716 | return 0; | |
717 | } | |
718 | buffer_init(&b); | |
6aacefa7 | 719 | switch (key->type) { |
fa08c86b | 720 | case KEY_DSA: |
721 | buffer_put_cstring(&b, key_ssh_name(key)); | |
722 | buffer_put_bignum2(&b, key->dsa->p); | |
723 | buffer_put_bignum2(&b, key->dsa->q); | |
724 | buffer_put_bignum2(&b, key->dsa->g); | |
725 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
726 | break; | |
727 | case KEY_RSA: | |
728 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 729 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 730 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 731 | break; |
732 | default: | |
f7436b8c | 733 | error("key_to_blob: unsupported key type %d", key->type); |
734 | buffer_free(&b); | |
735 | return 0; | |
fa08c86b | 736 | } |
737 | len = buffer_len(&b); | |
738 | buf = xmalloc(len); | |
739 | memcpy(buf, buffer_ptr(&b), len); | |
740 | memset(buffer_ptr(&b), 0, len); | |
741 | buffer_free(&b); | |
742 | if (lenp != NULL) | |
743 | *lenp = len; | |
744 | if (blobp != NULL) | |
745 | *blobp = buf; | |
746 | return len; | |
747 | } | |
748 | ||
749 | int | |
750 | key_sign( | |
751 | Key *key, | |
1e3b8b07 | 752 | u_char **sigp, int *lenp, |
753 | u_char *data, int datalen) | |
fa08c86b | 754 | { |
6aacefa7 | 755 | switch (key->type) { |
fa08c86b | 756 | case KEY_DSA: |
757 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
758 | break; | |
759 | case KEY_RSA: | |
760 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
761 | break; | |
762 | default: | |
763 | error("key_sign: illegal key type %d", key->type); | |
764 | return -1; | |
765 | break; | |
766 | } | |
767 | } | |
768 | ||
769 | int | |
770 | key_verify( | |
771 | Key *key, | |
1e3b8b07 | 772 | u_char *signature, int signaturelen, |
773 | u_char *data, int datalen) | |
fa08c86b | 774 | { |
c10d042a | 775 | if (signaturelen == 0) |
776 | return -1; | |
777 | ||
6aacefa7 | 778 | switch (key->type) { |
fa08c86b | 779 | case KEY_DSA: |
780 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
781 | break; | |
782 | case KEY_RSA: | |
783 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
784 | break; | |
785 | default: | |
786 | error("key_verify: illegal key type %d", key->type); | |
787 | return -1; | |
788 | break; | |
789 | } | |
790 | } |