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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" |
b775c6f2 | 35 | RCSID("$OpenBSD: key.c,v 1.38 2001/12/27 18:22:16 markus 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: |
b775c6f2 | 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"); | |
4fe2af09 | 69 | k->rsa = rsa; |
70 | break; | |
71 | case KEY_DSA: | |
b775c6f2 | 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"); | |
4fe2af09 | 82 | k->dsa = dsa; |
83 | break; | |
fa08c86b | 84 | case KEY_UNSPEC: |
4fe2af09 | 85 | break; |
86 | default: | |
87 | fatal("key_new: bad key type %d", k->type); | |
88 | break; | |
89 | } | |
90 | return k; | |
91 | } | |
fa08c86b | 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: | |
b775c6f2 | 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"); | |
fa08c86b | 111 | break; |
112 | case KEY_DSA: | |
b775c6f2 | 113 | if ((k->dsa->priv_key = BN_new()) == NULL) |
114 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 115 | break; |
116 | case KEY_UNSPEC: | |
117 | break; | |
118 | default: | |
119 | break; | |
120 | } | |
121 | return k; | |
122 | } | |
4fe2af09 | 123 | void |
124 | key_free(Key *k) | |
125 | { | |
126 | switch (k->type) { | |
fa08c86b | 127 | case KEY_RSA1: |
4fe2af09 | 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; | |
fa08c86b | 138 | case KEY_UNSPEC: |
139 | break; | |
4fe2af09 | 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) { | |
fa08c86b | 152 | case KEY_RSA1: |
4fe2af09 | 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: | |
a306f2dd | 166 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 167 | break; |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
396c147e | 172 | static u_char* |
301e8e5b | 173 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length) |
4fe2af09 | 174 | { |
79c9ac1b | 175 | EVP_MD *md = NULL; |
176 | EVP_MD_CTX ctx; | |
1e3b8b07 | 177 | u_char *blob = NULL; |
301e8e5b | 178 | u_char *retval = NULL; |
4fe2af09 | 179 | int len = 0; |
a306f2dd | 180 | int nlen, elen; |
4fe2af09 | 181 | |
301e8e5b | 182 | *dgst_raw_length = 0; |
183 | ||
79c9ac1b | 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 | } | |
4fe2af09 | 195 | switch (k->type) { |
fa08c86b | 196 | case KEY_RSA1: |
4fe2af09 | 197 | nlen = BN_num_bytes(k->rsa->n); |
198 | elen = BN_num_bytes(k->rsa->e); | |
199 | len = nlen + elen; | |
a306f2dd | 200 | blob = xmalloc(len); |
201 | BN_bn2bin(k->rsa->n, blob); | |
202 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 203 | break; |
204 | case KEY_DSA: | |
fa08c86b | 205 | case KEY_RSA: |
206 | key_to_blob(k, &blob, &len); | |
207 | break; | |
208 | case KEY_UNSPEC: | |
209 | return retval; | |
4fe2af09 | 210 | break; |
211 | default: | |
301e8e5b | 212 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 213 | break; |
214 | } | |
a306f2dd | 215 | if (blob != NULL) { |
301e8e5b | 216 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 217 | EVP_DigestInit(&ctx, md); |
218 | EVP_DigestUpdate(&ctx, blob, len); | |
301e8e5b | 219 | EVP_DigestFinal(&ctx, retval, NULL); |
220 | *dgst_raw_length = md->md_size; | |
a306f2dd | 221 | memset(blob, 0, len); |
222 | xfree(blob); | |
301e8e5b | 223 | } else { |
224 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 225 | } |
226 | return retval; | |
227 | } | |
228 | ||
396c147e | 229 | static char* |
cd332296 | 230 | key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) |
301e8e5b | 231 | { |
232 | char *retval; | |
233 | int i; | |
234 | ||
a88b7b57 | 235 | retval = xmalloc(dgst_raw_len * 3 + 1); |
301e8e5b | 236 | retval[0] = '\0'; |
184eed6a | 237 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 238 | char hex[4]; |
239 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
240 | strlcat(retval, hex, dgst_raw_len * 3); | |
241 | } | |
242 | retval[(dgst_raw_len * 3) - 1] = '\0'; | |
243 | return retval; | |
244 | } | |
245 | ||
396c147e | 246 | static char* |
cd332296 | 247 | key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) |
301e8e5b | 248 | { |
249 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
250 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
251 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 252 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 253 | char *retval; |
254 | ||
255 | rounds = (dgst_raw_len / 2) + 1; | |
256 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
08345971 | 257 | retval[j++] = 'x'; |
258 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 259 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 260 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
261 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 262 | seed) % 6; |
08345971 | 263 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
264 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 265 | (seed / 6)) % 6; |
08345971 | 266 | retval[j++] = vowels[idx0]; |
267 | retval[j++] = consonants[idx1]; | |
268 | retval[j++] = vowels[idx2]; | |
269 | if ((i + 1) < rounds) { | |
270 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
271 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
272 | retval[j++] = consonants[idx3]; | |
273 | retval[j++] = '-'; | |
274 | retval[j++] = consonants[idx4]; | |
301e8e5b | 275 | seed = ((seed * 5) + |
08345971 | 276 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
277 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 278 | } |
279 | } else { | |
280 | idx0 = seed % 6; | |
281 | idx1 = 16; | |
282 | idx2 = seed / 6; | |
08345971 | 283 | retval[j++] = vowels[idx0]; |
284 | retval[j++] = consonants[idx1]; | |
285 | retval[j++] = vowels[idx2]; | |
301e8e5b | 286 | } |
287 | } | |
08345971 | 288 | retval[j++] = 'x'; |
289 | retval[j++] = '\0'; | |
301e8e5b | 290 | return retval; |
291 | } | |
292 | ||
293 | char* | |
22138a36 | 294 | key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 295 | { |
cd332296 | 296 | char *retval = NULL; |
301e8e5b | 297 | u_char *dgst_raw; |
cd332296 | 298 | size_t dgst_raw_len; |
184eed6a | 299 | |
301e8e5b | 300 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
301 | if (!dgst_raw) | |
22138a36 | 302 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 303 | switch (dgst_rep) { |
301e8e5b | 304 | case SSH_FP_HEX: |
305 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
306 | break; | |
307 | case SSH_FP_BUBBLEBABBLE: | |
308 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
309 | break; | |
310 | default: | |
311 | fatal("key_fingerprint_ex: bad digest representation %d", | |
312 | dgst_rep); | |
313 | break; | |
314 | } | |
315 | memset(dgst_raw, 0, dgst_raw_len); | |
316 | xfree(dgst_raw); | |
317 | return retval; | |
318 | } | |
319 | ||
4fe2af09 | 320 | /* |
321 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
322 | * the pointer. The integer must already be initialized. This function is | |
323 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
324 | * last processed (and maybe modified) character. Note that this may modify | |
325 | * the buffer containing the number. | |
326 | */ | |
396c147e | 327 | static int |
4fe2af09 | 328 | read_bignum(char **cpp, BIGNUM * value) |
329 | { | |
330 | char *cp = *cpp; | |
331 | int old; | |
332 | ||
333 | /* Skip any leading whitespace. */ | |
334 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
335 | ; | |
336 | ||
337 | /* Check that it begins with a decimal digit. */ | |
338 | if (*cp < '0' || *cp > '9') | |
339 | return 0; | |
340 | ||
341 | /* Save starting position. */ | |
342 | *cpp = cp; | |
343 | ||
344 | /* Move forward until all decimal digits skipped. */ | |
345 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
346 | ; | |
347 | ||
348 | /* Save the old terminating character, and replace it by \0. */ | |
349 | old = *cp; | |
350 | *cp = 0; | |
351 | ||
352 | /* Parse the number. */ | |
353 | if (BN_dec2bn(&value, *cpp) == 0) | |
354 | return 0; | |
355 | ||
356 | /* Restore old terminating character. */ | |
357 | *cp = old; | |
358 | ||
359 | /* Move beyond the number and return success. */ | |
360 | *cpp = cp; | |
361 | return 1; | |
362 | } | |
396c147e | 363 | static int |
4fe2af09 | 364 | write_bignum(FILE *f, BIGNUM *num) |
365 | { | |
366 | char *buf = BN_bn2dec(num); | |
367 | if (buf == NULL) { | |
368 | error("write_bignum: BN_bn2dec() failed"); | |
369 | return 0; | |
370 | } | |
371 | fprintf(f, " %s", buf); | |
c48c32c1 | 372 | OPENSSL_free(buf); |
4fe2af09 | 373 | return 1; |
374 | } | |
fa08c86b | 375 | |
cb8c7bad | 376 | /* returns 1 ok, -1 error */ |
fa08c86b | 377 | int |
a306f2dd | 378 | key_read(Key *ret, char **cpp) |
4fe2af09 | 379 | { |
a306f2dd | 380 | Key *k; |
fa08c86b | 381 | int success = -1; |
382 | char *cp, *space; | |
383 | int len, n, type; | |
384 | u_int bits; | |
1e3b8b07 | 385 | u_char *blob; |
a306f2dd | 386 | |
387 | cp = *cpp; | |
388 | ||
6aacefa7 | 389 | switch (ret->type) { |
fa08c86b | 390 | case KEY_RSA1: |
a306f2dd | 391 | /* Get number of bits. */ |
392 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 393 | return -1; /* Bad bit count... */ |
a306f2dd | 394 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
395 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 396 | if (bits == 0) |
fa08c86b | 397 | return -1; |
a306f2dd | 398 | *cpp = cp; |
4fe2af09 | 399 | /* Get public exponent, public modulus. */ |
400 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 401 | return -1; |
4fe2af09 | 402 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 403 | return -1; |
404 | success = 1; | |
4fe2af09 | 405 | break; |
fa08c86b | 406 | case KEY_UNSPEC: |
407 | case KEY_RSA: | |
4fe2af09 | 408 | case KEY_DSA: |
fa08c86b | 409 | space = strchr(cp, ' '); |
410 | if (space == NULL) { | |
411 | debug3("key_read: no space"); | |
412 | return -1; | |
413 | } | |
414 | *space = '\0'; | |
415 | type = key_type_from_name(cp); | |
416 | *space = ' '; | |
417 | if (type == KEY_UNSPEC) { | |
418 | debug3("key_read: no key found"); | |
419 | return -1; | |
420 | } | |
421 | cp = space+1; | |
422 | if (*cp == '\0') { | |
423 | debug3("key_read: short string"); | |
424 | return -1; | |
425 | } | |
426 | if (ret->type == KEY_UNSPEC) { | |
427 | ret->type = type; | |
428 | } else if (ret->type != type) { | |
429 | /* is a key, but different type */ | |
430 | debug3("key_read: type mismatch"); | |
cb8c7bad | 431 | return -1; |
fa08c86b | 432 | } |
a306f2dd | 433 | len = 2*strlen(cp); |
434 | blob = xmalloc(len); | |
435 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 436 | if (n < 0) { |
71276795 | 437 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 438 | xfree(blob); |
fa08c86b | 439 | return -1; |
1d1ffb87 | 440 | } |
fa08c86b | 441 | k = key_from_blob(blob, n); |
2f98d223 | 442 | xfree(blob); |
71276795 | 443 | if (k == NULL) { |
fa08c86b | 444 | error("key_read: key_from_blob %s failed", cp); |
445 | return -1; | |
71276795 | 446 | } |
fa08c86b | 447 | if (k->type != type) { |
448 | error("key_read: type mismatch: encoding error"); | |
449 | key_free(k); | |
450 | return -1; | |
451 | } | |
452 | /*XXXX*/ | |
453 | if (ret->type == KEY_RSA) { | |
454 | if (ret->rsa != NULL) | |
455 | RSA_free(ret->rsa); | |
456 | ret->rsa = k->rsa; | |
457 | k->rsa = NULL; | |
458 | success = 1; | |
459 | #ifdef DEBUG_PK | |
460 | RSA_print_fp(stderr, ret->rsa, 8); | |
461 | #endif | |
462 | } else { | |
463 | if (ret->dsa != NULL) | |
464 | DSA_free(ret->dsa); | |
465 | ret->dsa = k->dsa; | |
466 | k->dsa = NULL; | |
467 | success = 1; | |
468 | #ifdef DEBUG_PK | |
469 | DSA_print_fp(stderr, ret->dsa, 8); | |
470 | #endif | |
471 | } | |
472 | /*XXXX*/ | |
2f98d223 | 473 | key_free(k); |
fa08c86b | 474 | if (success != 1) |
475 | break; | |
71276795 | 476 | /* advance cp: skip whitespace and data */ |
477 | while (*cp == ' ' || *cp == '\t') | |
478 | cp++; | |
479 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
480 | cp++; | |
481 | *cpp = cp; | |
4fe2af09 | 482 | break; |
483 | default: | |
a306f2dd | 484 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 485 | break; |
486 | } | |
fa08c86b | 487 | return success; |
4fe2af09 | 488 | } |
489 | int | |
490 | key_write(Key *key, FILE *f) | |
491 | { | |
492 | int success = 0; | |
1e3b8b07 | 493 | u_int bits = 0; |
4fe2af09 | 494 | |
fa08c86b | 495 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 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 | } | |
fa08c86b | 505 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
506 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
a306f2dd | 507 | int len, n; |
1e3b8b07 | 508 | u_char *blob, *uu; |
fa08c86b | 509 | key_to_blob(key, &blob, &len); |
a306f2dd | 510 | uu = xmalloc(2*len); |
1d1ffb87 | 511 | n = uuencode(blob, len, uu, 2*len); |
512 | if (n > 0) { | |
fa08c86b | 513 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 514 | success = 1; |
515 | } | |
a306f2dd | 516 | xfree(blob); |
517 | xfree(uu); | |
4fe2af09 | 518 | } |
519 | return success; | |
520 | } | |
1d1ffb87 | 521 | char * |
522 | key_type(Key *k) | |
523 | { | |
524 | switch (k->type) { | |
fa08c86b | 525 | case KEY_RSA1: |
526 | return "RSA1"; | |
527 | break; | |
1d1ffb87 | 528 | case KEY_RSA: |
529 | return "RSA"; | |
530 | break; | |
531 | case KEY_DSA: | |
532 | return "DSA"; | |
533 | break; | |
534 | } | |
535 | return "unknown"; | |
536 | } | |
fa08c86b | 537 | char * |
538 | key_ssh_name(Key *k) | |
539 | { | |
540 | switch (k->type) { | |
541 | case KEY_RSA: | |
542 | return "ssh-rsa"; | |
543 | break; | |
544 | case KEY_DSA: | |
545 | return "ssh-dss"; | |
546 | break; | |
547 | } | |
548 | return "ssh-unknown"; | |
549 | } | |
550 | u_int | |
6aacefa7 | 551 | key_size(Key *k) |
552 | { | |
2e73a022 | 553 | switch (k->type) { |
fa08c86b | 554 | case KEY_RSA1: |
2e73a022 | 555 | case KEY_RSA: |
556 | return BN_num_bits(k->rsa->n); | |
557 | break; | |
558 | case KEY_DSA: | |
559 | return BN_num_bits(k->dsa->p); | |
560 | break; | |
561 | } | |
562 | return 0; | |
563 | } | |
fa08c86b | 564 | |
396c147e | 565 | static RSA * |
1e3b8b07 | 566 | rsa_generate_private_key(u_int bits) |
fa08c86b | 567 | { |
2b87da3b | 568 | RSA *private; |
569 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
570 | if (private == NULL) | |
571 | fatal("rsa_generate_private_key: key generation failed."); | |
572 | return private; | |
fa08c86b | 573 | } |
574 | ||
396c147e | 575 | static DSA* |
1e3b8b07 | 576 | dsa_generate_private_key(u_int bits) |
fa08c86b | 577 | { |
578 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
579 | if (private == NULL) | |
580 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
581 | if (!DSA_generate_key(private)) | |
2b87da3b | 582 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
583 | if (private == NULL) | |
584 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 585 | return private; |
586 | } | |
587 | ||
588 | Key * | |
1e3b8b07 | 589 | key_generate(int type, u_int bits) |
fa08c86b | 590 | { |
591 | Key *k = key_new(KEY_UNSPEC); | |
592 | switch (type) { | |
2b87da3b | 593 | case KEY_DSA: |
fa08c86b | 594 | k->dsa = dsa_generate_private_key(bits); |
595 | break; | |
596 | case KEY_RSA: | |
597 | case KEY_RSA1: | |
598 | k->rsa = rsa_generate_private_key(bits); | |
599 | break; | |
600 | default: | |
2b87da3b | 601 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 602 | } |
2b87da3b | 603 | k->type = type; |
fa08c86b | 604 | return k; |
605 | } | |
606 | ||
607 | Key * | |
608 | key_from_private(Key *k) | |
609 | { | |
610 | Key *n = NULL; | |
611 | switch (k->type) { | |
2b87da3b | 612 | case KEY_DSA: |
fa08c86b | 613 | n = key_new(k->type); |
614 | BN_copy(n->dsa->p, k->dsa->p); | |
615 | BN_copy(n->dsa->q, k->dsa->q); | |
616 | BN_copy(n->dsa->g, k->dsa->g); | |
617 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
618 | break; | |
619 | case KEY_RSA: | |
620 | case KEY_RSA1: | |
621 | n = key_new(k->type); | |
622 | BN_copy(n->rsa->n, k->rsa->n); | |
623 | BN_copy(n->rsa->e, k->rsa->e); | |
624 | break; | |
625 | default: | |
2b87da3b | 626 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 627 | break; |
628 | } | |
629 | return n; | |
630 | } | |
631 | ||
632 | int | |
633 | key_type_from_name(char *name) | |
634 | { | |
6aacefa7 | 635 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 636 | return KEY_RSA1; |
6aacefa7 | 637 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 638 | return KEY_RSA; |
6aacefa7 | 639 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 640 | return KEY_DSA; |
6aacefa7 | 641 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 642 | return KEY_RSA; |
6aacefa7 | 643 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 644 | return KEY_DSA; |
645 | } | |
539af7f5 | 646 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 647 | return KEY_UNSPEC; |
648 | } | |
649 | ||
e961a8f9 | 650 | int |
651 | key_names_valid2(const char *names) | |
652 | { | |
653 | char *s, *cp, *p; | |
654 | ||
655 | if (names == NULL || strcmp(names, "") == 0) | |
656 | return 0; | |
657 | s = cp = xstrdup(names); | |
658 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 659 | (p = strsep(&cp, ","))) { |
e961a8f9 | 660 | switch (key_type_from_name(p)) { |
661 | case KEY_RSA1: | |
662 | case KEY_UNSPEC: | |
663 | xfree(s); | |
664 | return 0; | |
665 | } | |
666 | } | |
667 | debug3("key names ok: [%s]", names); | |
668 | xfree(s); | |
669 | return 1; | |
670 | } | |
671 | ||
fa08c86b | 672 | Key * |
cf54363d | 673 | key_from_blob(u_char *blob, int blen) |
fa08c86b | 674 | { |
675 | Buffer b; | |
676 | char *ktype; | |
677 | int rlen, type; | |
678 | Key *key = NULL; | |
679 | ||
680 | #ifdef DEBUG_PK | |
681 | dump_base64(stderr, blob, blen); | |
682 | #endif | |
683 | buffer_init(&b); | |
684 | buffer_append(&b, blob, blen); | |
685 | ktype = buffer_get_string(&b, NULL); | |
686 | type = key_type_from_name(ktype); | |
687 | ||
6aacefa7 | 688 | switch (type) { |
fa08c86b | 689 | case KEY_RSA: |
690 | key = key_new(type); | |
fa08c86b | 691 | buffer_get_bignum2(&b, key->rsa->e); |
b5c334cc | 692 | buffer_get_bignum2(&b, key->rsa->n); |
fa08c86b | 693 | #ifdef DEBUG_PK |
694 | RSA_print_fp(stderr, key->rsa, 8); | |
695 | #endif | |
696 | break; | |
697 | case KEY_DSA: | |
698 | key = key_new(type); | |
699 | buffer_get_bignum2(&b, key->dsa->p); | |
700 | buffer_get_bignum2(&b, key->dsa->q); | |
701 | buffer_get_bignum2(&b, key->dsa->g); | |
702 | buffer_get_bignum2(&b, key->dsa->pub_key); | |
703 | #ifdef DEBUG_PK | |
704 | DSA_print_fp(stderr, key->dsa, 8); | |
705 | #endif | |
706 | break; | |
707 | case KEY_UNSPEC: | |
708 | key = key_new(type); | |
709 | break; | |
710 | default: | |
711 | error("key_from_blob: cannot handle type %s", ktype); | |
712 | break; | |
713 | } | |
714 | rlen = buffer_len(&b); | |
715 | if (key != NULL && rlen != 0) | |
716 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
717 | xfree(ktype); | |
718 | buffer_free(&b); | |
719 | return key; | |
720 | } | |
721 | ||
722 | int | |
1e3b8b07 | 723 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 724 | { |
725 | Buffer b; | |
726 | int len; | |
1e3b8b07 | 727 | u_char *buf; |
fa08c86b | 728 | |
729 | if (key == NULL) { | |
730 | error("key_to_blob: key == NULL"); | |
731 | return 0; | |
732 | } | |
733 | buffer_init(&b); | |
6aacefa7 | 734 | switch (key->type) { |
fa08c86b | 735 | case KEY_DSA: |
736 | buffer_put_cstring(&b, key_ssh_name(key)); | |
737 | buffer_put_bignum2(&b, key->dsa->p); | |
738 | buffer_put_bignum2(&b, key->dsa->q); | |
739 | buffer_put_bignum2(&b, key->dsa->g); | |
740 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
741 | break; | |
742 | case KEY_RSA: | |
743 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 744 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 745 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 746 | break; |
747 | default: | |
f7436b8c | 748 | error("key_to_blob: unsupported key type %d", key->type); |
749 | buffer_free(&b); | |
750 | return 0; | |
fa08c86b | 751 | } |
752 | len = buffer_len(&b); | |
753 | buf = xmalloc(len); | |
754 | memcpy(buf, buffer_ptr(&b), len); | |
755 | memset(buffer_ptr(&b), 0, len); | |
756 | buffer_free(&b); | |
757 | if (lenp != NULL) | |
758 | *lenp = len; | |
759 | if (blobp != NULL) | |
760 | *blobp = buf; | |
761 | return len; | |
762 | } | |
763 | ||
764 | int | |
765 | key_sign( | |
766 | Key *key, | |
1e3b8b07 | 767 | u_char **sigp, int *lenp, |
768 | u_char *data, int datalen) | |
fa08c86b | 769 | { |
6aacefa7 | 770 | switch (key->type) { |
fa08c86b | 771 | case KEY_DSA: |
772 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
773 | break; | |
774 | case KEY_RSA: | |
775 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
776 | break; | |
777 | default: | |
778 | error("key_sign: illegal key type %d", key->type); | |
779 | return -1; | |
780 | break; | |
781 | } | |
782 | } | |
783 | ||
784 | int | |
785 | key_verify( | |
786 | Key *key, | |
1e3b8b07 | 787 | u_char *signature, int signaturelen, |
788 | u_char *data, int datalen) | |
fa08c86b | 789 | { |
c10d042a | 790 | if (signaturelen == 0) |
791 | return -1; | |
792 | ||
6aacefa7 | 793 | switch (key->type) { |
fa08c86b | 794 | case KEY_DSA: |
795 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
796 | break; | |
797 | case KEY_RSA: | |
798 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
799 | break; | |
800 | default: | |
801 | error("key_verify: illegal key type %d", key->type); | |
802 | return -1; | |
803 | break; | |
804 | } | |
805 | } |