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00146caa | 1 | /* $OpenBSD: key.c,v 1.65 2006/07/22 20:48:23 stevesk Exp $ */ |
4fe2af09 | 2 | /* |
bcbf86ec | 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 | * | |
a96070d4 | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
4fe2af09 | 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. | |
4fe2af09 | 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 | */ | |
4fe2af09 | 35 | #include "includes.h" |
42f11eb2 | 36 | |
4fe2af09 | 37 | #include <openssl/evp.h> |
42f11eb2 | 38 | |
00146caa | 39 | #include <string.h> |
40 | ||
4fe2af09 | 41 | #include "xmalloc.h" |
42 | #include "key.h" | |
fa08c86b | 43 | #include "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; | |
52e3daed | 55 | k = xcalloc(1, sizeof(*k)); |
4fe2af09 | 56 | k->type = type; |
a306f2dd | 57 | k->dsa = NULL; |
58 | k->rsa = NULL; | |
4fe2af09 | 59 | switch (k->type) { |
fa08c86b | 60 | case KEY_RSA1: |
4fe2af09 | 61 | case KEY_RSA: |
b775c6f2 | 62 | if ((rsa = RSA_new()) == NULL) |
63 | fatal("key_new: RSA_new failed"); | |
64 | if ((rsa->n = BN_new()) == NULL) | |
65 | fatal("key_new: BN_new failed"); | |
66 | if ((rsa->e = BN_new()) == NULL) | |
67 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 68 | k->rsa = rsa; |
69 | break; | |
70 | case KEY_DSA: | |
b775c6f2 | 71 | if ((dsa = DSA_new()) == NULL) |
72 | fatal("key_new: DSA_new failed"); | |
73 | if ((dsa->p = BN_new()) == NULL) | |
74 | fatal("key_new: BN_new failed"); | |
75 | if ((dsa->q = BN_new()) == NULL) | |
76 | fatal("key_new: BN_new failed"); | |
77 | if ((dsa->g = BN_new()) == NULL) | |
78 | fatal("key_new: BN_new failed"); | |
79 | if ((dsa->pub_key = BN_new()) == NULL) | |
80 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 81 | k->dsa = dsa; |
82 | break; | |
fa08c86b | 83 | case KEY_UNSPEC: |
4fe2af09 | 84 | break; |
85 | default: | |
86 | fatal("key_new: bad key type %d", k->type); | |
87 | break; | |
88 | } | |
89 | return k; | |
90 | } | |
3ddc795d | 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 | } | |
3ddc795d | 123 | |
4fe2af09 | 124 | void |
125 | key_free(Key *k) | |
126 | { | |
7016f7cf | 127 | if (k == NULL) |
353d48db | 128 | fatal("key_free: key is NULL"); |
4fe2af09 | 129 | switch (k->type) { |
fa08c86b | 130 | case KEY_RSA1: |
4fe2af09 | 131 | case KEY_RSA: |
132 | if (k->rsa != NULL) | |
133 | RSA_free(k->rsa); | |
134 | k->rsa = NULL; | |
135 | break; | |
136 | case KEY_DSA: | |
137 | if (k->dsa != NULL) | |
138 | DSA_free(k->dsa); | |
139 | k->dsa = NULL; | |
140 | break; | |
fa08c86b | 141 | case KEY_UNSPEC: |
142 | break; | |
4fe2af09 | 143 | default: |
144 | fatal("key_free: bad key type %d", k->type); | |
145 | break; | |
146 | } | |
147 | xfree(k); | |
148 | } | |
b6c7b7b7 | 149 | |
4fe2af09 | 150 | int |
b6c7b7b7 | 151 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 152 | { |
153 | if (a == NULL || b == NULL || a->type != b->type) | |
154 | return 0; | |
155 | switch (a->type) { | |
fa08c86b | 156 | case KEY_RSA1: |
4fe2af09 | 157 | case KEY_RSA: |
158 | return a->rsa != NULL && b->rsa != NULL && | |
159 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
160 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
4fe2af09 | 161 | case KEY_DSA: |
162 | return a->dsa != NULL && b->dsa != NULL && | |
163 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
164 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
165 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
166 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
4fe2af09 | 167 | default: |
a306f2dd | 168 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 169 | break; |
170 | } | |
171 | return 0; | |
172 | } | |
173 | ||
21289cd0 | 174 | u_char* |
b6c7b7b7 | 175 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
176 | u_int *dgst_raw_length) | |
4fe2af09 | 177 | { |
714954dc | 178 | const EVP_MD *md = NULL; |
79c9ac1b | 179 | EVP_MD_CTX ctx; |
1e3b8b07 | 180 | u_char *blob = NULL; |
301e8e5b | 181 | u_char *retval = NULL; |
c66f9d0e | 182 | u_int len = 0; |
a306f2dd | 183 | int nlen, elen; |
4fe2af09 | 184 | |
301e8e5b | 185 | *dgst_raw_length = 0; |
186 | ||
79c9ac1b | 187 | switch (dgst_type) { |
188 | case SSH_FP_MD5: | |
189 | md = EVP_md5(); | |
190 | break; | |
191 | case SSH_FP_SHA1: | |
192 | md = EVP_sha1(); | |
193 | break; | |
194 | default: | |
195 | fatal("key_fingerprint_raw: bad digest type %d", | |
196 | dgst_type); | |
197 | } | |
4fe2af09 | 198 | switch (k->type) { |
fa08c86b | 199 | case KEY_RSA1: |
4fe2af09 | 200 | nlen = BN_num_bytes(k->rsa->n); |
201 | elen = BN_num_bytes(k->rsa->e); | |
202 | len = nlen + elen; | |
a306f2dd | 203 | blob = xmalloc(len); |
204 | BN_bn2bin(k->rsa->n, blob); | |
205 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 206 | break; |
207 | case KEY_DSA: | |
fa08c86b | 208 | case KEY_RSA: |
209 | key_to_blob(k, &blob, &len); | |
210 | break; | |
211 | case KEY_UNSPEC: | |
212 | return retval; | |
4fe2af09 | 213 | default: |
301e8e5b | 214 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 215 | break; |
216 | } | |
a306f2dd | 217 | if (blob != NULL) { |
301e8e5b | 218 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 219 | EVP_DigestInit(&ctx, md); |
220 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 221 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 222 | memset(blob, 0, len); |
223 | xfree(blob); | |
301e8e5b | 224 | } else { |
225 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 226 | } |
227 | return retval; | |
228 | } | |
229 | ||
343288b8 | 230 | static char * |
231 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 232 | { |
233 | char *retval; | |
2ceb8101 | 234 | u_int i; |
301e8e5b | 235 | |
52e3daed | 236 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
184eed6a | 237 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 238 | char hex[4]; |
239 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 240 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 241 | } |
956b0f56 | 242 | |
243 | /* Remove the trailing ':' character */ | |
301e8e5b | 244 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
245 | return retval; | |
246 | } | |
247 | ||
343288b8 | 248 | static char * |
249 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 250 | { |
251 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
252 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
253 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 254 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 255 | char *retval; |
256 | ||
257 | rounds = (dgst_raw_len / 2) + 1; | |
52e3daed | 258 | retval = xcalloc((rounds * 6), sizeof(char)); |
08345971 | 259 | retval[j++] = 'x'; |
260 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 261 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 262 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
263 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 264 | seed) % 6; |
08345971 | 265 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
266 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 267 | (seed / 6)) % 6; |
08345971 | 268 | retval[j++] = vowels[idx0]; |
269 | retval[j++] = consonants[idx1]; | |
270 | retval[j++] = vowels[idx2]; | |
271 | if ((i + 1) < rounds) { | |
272 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
273 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
274 | retval[j++] = consonants[idx3]; | |
275 | retval[j++] = '-'; | |
276 | retval[j++] = consonants[idx4]; | |
301e8e5b | 277 | seed = ((seed * 5) + |
08345971 | 278 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
279 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 280 | } |
281 | } else { | |
282 | idx0 = seed % 6; | |
283 | idx1 = 16; | |
284 | idx2 = seed / 6; | |
08345971 | 285 | retval[j++] = vowels[idx0]; |
286 | retval[j++] = consonants[idx1]; | |
287 | retval[j++] = vowels[idx2]; | |
301e8e5b | 288 | } |
289 | } | |
08345971 | 290 | retval[j++] = 'x'; |
291 | retval[j++] = '\0'; | |
301e8e5b | 292 | return retval; |
293 | } | |
294 | ||
343288b8 | 295 | char * |
b6c7b7b7 | 296 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 297 | { |
cd332296 | 298 | char *retval = NULL; |
301e8e5b | 299 | u_char *dgst_raw; |
a209a158 | 300 | u_int dgst_raw_len; |
184eed6a | 301 | |
301e8e5b | 302 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
303 | if (!dgst_raw) | |
22138a36 | 304 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 305 | switch (dgst_rep) { |
301e8e5b | 306 | case SSH_FP_HEX: |
307 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
308 | break; | |
309 | case SSH_FP_BUBBLEBABBLE: | |
310 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
311 | break; | |
312 | default: | |
313 | fatal("key_fingerprint_ex: bad digest representation %d", | |
314 | dgst_rep); | |
315 | break; | |
316 | } | |
317 | memset(dgst_raw, 0, dgst_raw_len); | |
318 | xfree(dgst_raw); | |
319 | return retval; | |
320 | } | |
321 | ||
4fe2af09 | 322 | /* |
323 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
324 | * the pointer. The integer must already be initialized. This function is | |
325 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
326 | * last processed (and maybe modified) character. Note that this may modify | |
327 | * the buffer containing the number. | |
328 | */ | |
396c147e | 329 | static int |
4fe2af09 | 330 | read_bignum(char **cpp, BIGNUM * value) |
331 | { | |
332 | char *cp = *cpp; | |
333 | int old; | |
334 | ||
335 | /* Skip any leading whitespace. */ | |
336 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
337 | ; | |
338 | ||
339 | /* Check that it begins with a decimal digit. */ | |
340 | if (*cp < '0' || *cp > '9') | |
341 | return 0; | |
342 | ||
343 | /* Save starting position. */ | |
344 | *cpp = cp; | |
345 | ||
346 | /* Move forward until all decimal digits skipped. */ | |
347 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
348 | ; | |
349 | ||
350 | /* Save the old terminating character, and replace it by \0. */ | |
351 | old = *cp; | |
352 | *cp = 0; | |
353 | ||
354 | /* Parse the number. */ | |
355 | if (BN_dec2bn(&value, *cpp) == 0) | |
356 | return 0; | |
357 | ||
358 | /* Restore old terminating character. */ | |
359 | *cp = old; | |
360 | ||
361 | /* Move beyond the number and return success. */ | |
362 | *cpp = cp; | |
363 | return 1; | |
364 | } | |
3ddc795d | 365 | |
396c147e | 366 | static int |
4fe2af09 | 367 | write_bignum(FILE *f, BIGNUM *num) |
368 | { | |
369 | char *buf = BN_bn2dec(num); | |
370 | if (buf == NULL) { | |
371 | error("write_bignum: BN_bn2dec() failed"); | |
372 | return 0; | |
373 | } | |
374 | fprintf(f, " %s", buf); | |
c48c32c1 | 375 | OPENSSL_free(buf); |
4fe2af09 | 376 | return 1; |
377 | } | |
fa08c86b | 378 | |
cb8c7bad | 379 | /* returns 1 ok, -1 error */ |
fa08c86b | 380 | int |
a306f2dd | 381 | key_read(Key *ret, char **cpp) |
4fe2af09 | 382 | { |
a306f2dd | 383 | Key *k; |
fa08c86b | 384 | int success = -1; |
385 | char *cp, *space; | |
386 | int len, n, type; | |
387 | u_int bits; | |
1e3b8b07 | 388 | u_char *blob; |
a306f2dd | 389 | |
390 | cp = *cpp; | |
391 | ||
6aacefa7 | 392 | switch (ret->type) { |
fa08c86b | 393 | case KEY_RSA1: |
a306f2dd | 394 | /* Get number of bits. */ |
395 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 396 | return -1; /* Bad bit count... */ |
a306f2dd | 397 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
398 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 399 | if (bits == 0) |
fa08c86b | 400 | return -1; |
a306f2dd | 401 | *cpp = cp; |
4fe2af09 | 402 | /* Get public exponent, public modulus. */ |
403 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 404 | return -1; |
4fe2af09 | 405 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 406 | return -1; |
407 | success = 1; | |
4fe2af09 | 408 | break; |
fa08c86b | 409 | case KEY_UNSPEC: |
410 | case KEY_RSA: | |
4fe2af09 | 411 | case KEY_DSA: |
fa08c86b | 412 | space = strchr(cp, ' '); |
413 | if (space == NULL) { | |
79cfe67c | 414 | debug3("key_read: missing whitespace"); |
fa08c86b | 415 | return -1; |
416 | } | |
417 | *space = '\0'; | |
418 | type = key_type_from_name(cp); | |
419 | *space = ' '; | |
420 | if (type == KEY_UNSPEC) { | |
79cfe67c | 421 | debug3("key_read: missing keytype"); |
fa08c86b | 422 | return -1; |
423 | } | |
424 | cp = space+1; | |
425 | if (*cp == '\0') { | |
426 | debug3("key_read: short string"); | |
427 | return -1; | |
428 | } | |
429 | if (ret->type == KEY_UNSPEC) { | |
430 | ret->type = type; | |
431 | } else if (ret->type != type) { | |
432 | /* is a key, but different type */ | |
433 | debug3("key_read: type mismatch"); | |
cb8c7bad | 434 | return -1; |
fa08c86b | 435 | } |
a306f2dd | 436 | len = 2*strlen(cp); |
437 | blob = xmalloc(len); | |
438 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 439 | if (n < 0) { |
71276795 | 440 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 441 | xfree(blob); |
fa08c86b | 442 | return -1; |
1d1ffb87 | 443 | } |
a27002e5 | 444 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 445 | xfree(blob); |
71276795 | 446 | if (k == NULL) { |
fa08c86b | 447 | error("key_read: key_from_blob %s failed", cp); |
448 | return -1; | |
71276795 | 449 | } |
fa08c86b | 450 | if (k->type != type) { |
451 | error("key_read: type mismatch: encoding error"); | |
452 | key_free(k); | |
453 | return -1; | |
454 | } | |
455 | /*XXXX*/ | |
456 | if (ret->type == KEY_RSA) { | |
457 | if (ret->rsa != NULL) | |
458 | RSA_free(ret->rsa); | |
459 | ret->rsa = k->rsa; | |
460 | k->rsa = NULL; | |
461 | success = 1; | |
462 | #ifdef DEBUG_PK | |
463 | RSA_print_fp(stderr, ret->rsa, 8); | |
464 | #endif | |
465 | } else { | |
466 | if (ret->dsa != NULL) | |
467 | DSA_free(ret->dsa); | |
468 | ret->dsa = k->dsa; | |
469 | k->dsa = NULL; | |
470 | success = 1; | |
471 | #ifdef DEBUG_PK | |
472 | DSA_print_fp(stderr, ret->dsa, 8); | |
473 | #endif | |
474 | } | |
475 | /*XXXX*/ | |
2f98d223 | 476 | key_free(k); |
fa08c86b | 477 | if (success != 1) |
478 | break; | |
71276795 | 479 | /* advance cp: skip whitespace and data */ |
480 | while (*cp == ' ' || *cp == '\t') | |
481 | cp++; | |
482 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
483 | cp++; | |
484 | *cpp = cp; | |
4fe2af09 | 485 | break; |
486 | default: | |
a306f2dd | 487 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 488 | break; |
489 | } | |
fa08c86b | 490 | return success; |
4fe2af09 | 491 | } |
3ddc795d | 492 | |
4fe2af09 | 493 | int |
b6c7b7b7 | 494 | key_write(const Key *key, FILE *f) |
4fe2af09 | 495 | { |
c66f9d0e | 496 | int n, success = 0; |
497 | u_int len, bits = 0; | |
661e45a0 | 498 | u_char *blob; |
499 | char *uu; | |
4fe2af09 | 500 | |
fa08c86b | 501 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 502 | /* size of modulus 'n' */ |
503 | bits = BN_num_bits(key->rsa->n); | |
504 | fprintf(f, "%u", bits); | |
505 | if (write_bignum(f, key->rsa->e) && | |
506 | write_bignum(f, key->rsa->n)) { | |
507 | success = 1; | |
508 | } else { | |
509 | error("key_write: failed for RSA key"); | |
510 | } | |
fa08c86b | 511 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
512 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 513 | key_to_blob(key, &blob, &len); |
a306f2dd | 514 | uu = xmalloc(2*len); |
1d1ffb87 | 515 | n = uuencode(blob, len, uu, 2*len); |
516 | if (n > 0) { | |
fa08c86b | 517 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 518 | success = 1; |
519 | } | |
a306f2dd | 520 | xfree(blob); |
521 | xfree(uu); | |
4fe2af09 | 522 | } |
523 | return success; | |
524 | } | |
3ddc795d | 525 | |
b6c7b7b7 | 526 | const char * |
527 | key_type(const Key *k) | |
1d1ffb87 | 528 | { |
529 | switch (k->type) { | |
fa08c86b | 530 | case KEY_RSA1: |
531 | return "RSA1"; | |
1d1ffb87 | 532 | case KEY_RSA: |
533 | return "RSA"; | |
1d1ffb87 | 534 | case KEY_DSA: |
535 | return "DSA"; | |
1d1ffb87 | 536 | } |
537 | return "unknown"; | |
538 | } | |
3ddc795d | 539 | |
b6c7b7b7 | 540 | const char * |
541 | key_ssh_name(const Key *k) | |
fa08c86b | 542 | { |
543 | switch (k->type) { | |
544 | case KEY_RSA: | |
545 | return "ssh-rsa"; | |
fa08c86b | 546 | case KEY_DSA: |
547 | return "ssh-dss"; | |
fa08c86b | 548 | } |
549 | return "ssh-unknown"; | |
550 | } | |
3ddc795d | 551 | |
fa08c86b | 552 | u_int |
b6c7b7b7 | 553 | key_size(const Key *k) |
6aacefa7 | 554 | { |
2e73a022 | 555 | switch (k->type) { |
fa08c86b | 556 | case KEY_RSA1: |
2e73a022 | 557 | case KEY_RSA: |
558 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 559 | case KEY_DSA: |
560 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 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; |
5ef36928 | 569 | |
2b87da3b | 570 | private = RSA_generate_key(bits, 35, NULL, NULL); |
571 | if (private == NULL) | |
572 | fatal("rsa_generate_private_key: key generation failed."); | |
573 | return private; | |
fa08c86b | 574 | } |
575 | ||
396c147e | 576 | static DSA* |
1e3b8b07 | 577 | dsa_generate_private_key(u_int bits) |
fa08c86b | 578 | { |
579 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 580 | |
fa08c86b | 581 | if (private == NULL) |
582 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
583 | if (!DSA_generate_key(private)) | |
2b87da3b | 584 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
585 | if (private == NULL) | |
586 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 587 | return private; |
588 | } | |
589 | ||
590 | Key * | |
1e3b8b07 | 591 | key_generate(int type, u_int bits) |
fa08c86b | 592 | { |
593 | Key *k = key_new(KEY_UNSPEC); | |
594 | switch (type) { | |
2b87da3b | 595 | case KEY_DSA: |
fa08c86b | 596 | k->dsa = dsa_generate_private_key(bits); |
597 | break; | |
598 | case KEY_RSA: | |
599 | case KEY_RSA1: | |
600 | k->rsa = rsa_generate_private_key(bits); | |
601 | break; | |
602 | default: | |
2b87da3b | 603 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 604 | } |
2b87da3b | 605 | k->type = type; |
fa08c86b | 606 | return k; |
607 | } | |
608 | ||
609 | Key * | |
b6c7b7b7 | 610 | key_from_private(const Key *k) |
fa08c86b | 611 | { |
612 | Key *n = NULL; | |
613 | switch (k->type) { | |
2b87da3b | 614 | case KEY_DSA: |
fa08c86b | 615 | n = key_new(k->type); |
616 | BN_copy(n->dsa->p, k->dsa->p); | |
617 | BN_copy(n->dsa->q, k->dsa->q); | |
618 | BN_copy(n->dsa->g, k->dsa->g); | |
619 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
620 | break; | |
621 | case KEY_RSA: | |
622 | case KEY_RSA1: | |
623 | n = key_new(k->type); | |
624 | BN_copy(n->rsa->n, k->rsa->n); | |
625 | BN_copy(n->rsa->e, k->rsa->e); | |
626 | break; | |
627 | default: | |
2b87da3b | 628 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 629 | break; |
630 | } | |
631 | return n; | |
632 | } | |
633 | ||
634 | int | |
635 | key_type_from_name(char *name) | |
636 | { | |
6aacefa7 | 637 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 638 | return KEY_RSA1; |
6aacefa7 | 639 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 640 | return KEY_RSA; |
6aacefa7 | 641 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 642 | return KEY_DSA; |
6aacefa7 | 643 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 644 | return KEY_RSA; |
6aacefa7 | 645 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 646 | return KEY_DSA; |
647 | } | |
539af7f5 | 648 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 649 | return KEY_UNSPEC; |
650 | } | |
651 | ||
e961a8f9 | 652 | int |
653 | key_names_valid2(const char *names) | |
654 | { | |
655 | char *s, *cp, *p; | |
656 | ||
657 | if (names == NULL || strcmp(names, "") == 0) | |
658 | return 0; | |
659 | s = cp = xstrdup(names); | |
660 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 661 | (p = strsep(&cp, ","))) { |
e961a8f9 | 662 | switch (key_type_from_name(p)) { |
663 | case KEY_RSA1: | |
664 | case KEY_UNSPEC: | |
665 | xfree(s); | |
666 | return 0; | |
667 | } | |
668 | } | |
669 | debug3("key names ok: [%s]", names); | |
670 | xfree(s); | |
671 | return 1; | |
672 | } | |
673 | ||
fa08c86b | 674 | Key * |
b6c7b7b7 | 675 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 676 | { |
677 | Buffer b; | |
fa08c86b | 678 | int rlen, type; |
63488674 | 679 | char *ktype = NULL; |
fa08c86b | 680 | Key *key = NULL; |
681 | ||
682 | #ifdef DEBUG_PK | |
683 | dump_base64(stderr, blob, blen); | |
684 | #endif | |
685 | buffer_init(&b); | |
686 | buffer_append(&b, blob, blen); | |
63488674 | 687 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
688 | error("key_from_blob: can't read key type"); | |
689 | goto out; | |
690 | } | |
691 | ||
fa08c86b | 692 | type = key_type_from_name(ktype); |
693 | ||
6aacefa7 | 694 | switch (type) { |
fa08c86b | 695 | case KEY_RSA: |
696 | key = key_new(type); | |
63488674 | 697 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
698 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
699 | error("key_from_blob: can't read rsa key"); | |
700 | key_free(key); | |
701 | key = NULL; | |
702 | goto out; | |
703 | } | |
fa08c86b | 704 | #ifdef DEBUG_PK |
705 | RSA_print_fp(stderr, key->rsa, 8); | |
706 | #endif | |
707 | break; | |
708 | case KEY_DSA: | |
709 | key = key_new(type); | |
63488674 | 710 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
711 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
712 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
713 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
714 | error("key_from_blob: can't read dsa key"); | |
715 | key_free(key); | |
716 | key = NULL; | |
717 | goto out; | |
718 | } | |
fa08c86b | 719 | #ifdef DEBUG_PK |
720 | DSA_print_fp(stderr, key->dsa, 8); | |
721 | #endif | |
722 | break; | |
723 | case KEY_UNSPEC: | |
724 | key = key_new(type); | |
725 | break; | |
726 | default: | |
727 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 728 | goto out; |
fa08c86b | 729 | } |
730 | rlen = buffer_len(&b); | |
731 | if (key != NULL && rlen != 0) | |
732 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 733 | out: |
734 | if (ktype != NULL) | |
735 | xfree(ktype); | |
fa08c86b | 736 | buffer_free(&b); |
737 | return key; | |
738 | } | |
739 | ||
740 | int | |
b6c7b7b7 | 741 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 742 | { |
743 | Buffer b; | |
744 | int len; | |
fa08c86b | 745 | |
746 | if (key == NULL) { | |
747 | error("key_to_blob: key == NULL"); | |
748 | return 0; | |
749 | } | |
750 | buffer_init(&b); | |
6aacefa7 | 751 | switch (key->type) { |
fa08c86b | 752 | case KEY_DSA: |
753 | buffer_put_cstring(&b, key_ssh_name(key)); | |
754 | buffer_put_bignum2(&b, key->dsa->p); | |
755 | buffer_put_bignum2(&b, key->dsa->q); | |
756 | buffer_put_bignum2(&b, key->dsa->g); | |
757 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
758 | break; | |
759 | case KEY_RSA: | |
760 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 761 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 762 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 763 | break; |
764 | default: | |
f7436b8c | 765 | error("key_to_blob: unsupported key type %d", key->type); |
766 | buffer_free(&b); | |
767 | return 0; | |
fa08c86b | 768 | } |
769 | len = buffer_len(&b); | |
fa08c86b | 770 | if (lenp != NULL) |
771 | *lenp = len; | |
eb9f2fab | 772 | if (blobp != NULL) { |
773 | *blobp = xmalloc(len); | |
774 | memcpy(*blobp, buffer_ptr(&b), len); | |
775 | } | |
776 | memset(buffer_ptr(&b), 0, len); | |
777 | buffer_free(&b); | |
fa08c86b | 778 | return len; |
779 | } | |
780 | ||
781 | int | |
782 | key_sign( | |
b6c7b7b7 | 783 | const Key *key, |
c66f9d0e | 784 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 785 | const u_char *data, u_int datalen) |
fa08c86b | 786 | { |
6aacefa7 | 787 | switch (key->type) { |
fa08c86b | 788 | case KEY_DSA: |
789 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 790 | case KEY_RSA: |
791 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 792 | default: |
d77347cc | 793 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 794 | return -1; |
fa08c86b | 795 | } |
796 | } | |
797 | ||
3ed81c99 | 798 | /* |
799 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
800 | * and -1 on error. | |
801 | */ | |
fa08c86b | 802 | int |
803 | key_verify( | |
b6c7b7b7 | 804 | const Key *key, |
805 | const u_char *signature, u_int signaturelen, | |
806 | const u_char *data, u_int datalen) | |
fa08c86b | 807 | { |
c10d042a | 808 | if (signaturelen == 0) |
809 | return -1; | |
810 | ||
6aacefa7 | 811 | switch (key->type) { |
fa08c86b | 812 | case KEY_DSA: |
813 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 814 | case KEY_RSA: |
815 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 816 | default: |
d77347cc | 817 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 818 | return -1; |
fa08c86b | 819 | } |
820 | } | |
d0074658 | 821 | |
822 | /* Converts a private to a public key */ | |
d0074658 | 823 | Key * |
b6c7b7b7 | 824 | key_demote(const Key *k) |
d0074658 | 825 | { |
826 | Key *pk; | |
762715ce | 827 | |
52e3daed | 828 | pk = xcalloc(1, sizeof(*pk)); |
d0074658 | 829 | pk->type = k->type; |
830 | pk->flags = k->flags; | |
831 | pk->dsa = NULL; | |
832 | pk->rsa = NULL; | |
833 | ||
834 | switch (k->type) { | |
835 | case KEY_RSA1: | |
836 | case KEY_RSA: | |
837 | if ((pk->rsa = RSA_new()) == NULL) | |
838 | fatal("key_demote: RSA_new failed"); | |
839 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
840 | fatal("key_demote: BN_dup failed"); | |
841 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
842 | fatal("key_demote: BN_dup failed"); | |
843 | break; | |
844 | case KEY_DSA: | |
845 | if ((pk->dsa = DSA_new()) == NULL) | |
846 | fatal("key_demote: DSA_new failed"); | |
847 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
848 | fatal("key_demote: BN_dup failed"); | |
849 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
850 | fatal("key_demote: BN_dup failed"); | |
851 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
852 | fatal("key_demote: BN_dup failed"); | |
853 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
854 | fatal("key_demote: BN_dup failed"); | |
855 | break; | |
856 | default: | |
857 | fatal("key_free: bad key type %d", k->type); | |
858 | break; | |
859 | } | |
860 | ||
861 | return (pk); | |
862 | } |