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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" |
42f11eb2 | 35 | |
4fe2af09 | 36 | #include <openssl/evp.h> |
42f11eb2 | 37 | |
4fe2af09 | 38 | #include "xmalloc.h" |
39 | #include "key.h" | |
fa08c86b | 40 | #include "rsa.h" |
a306f2dd | 41 | #include "uuencode.h" |
fa08c86b | 42 | #include "buffer.h" |
43 | #include "bufaux.h" | |
42f11eb2 | 44 | #include "log.h" |
4fe2af09 | 45 | |
46 | Key * | |
47 | key_new(int type) | |
48 | { | |
49 | Key *k; | |
50 | RSA *rsa; | |
51 | DSA *dsa; | |
52 | k = xmalloc(sizeof(*k)); | |
53 | k->type = type; | |
383546c4 | 54 | k->flags = 0; |
a306f2dd | 55 | k->dsa = NULL; |
56 | k->rsa = NULL; | |
4fe2af09 | 57 | switch (k->type) { |
fa08c86b | 58 | case KEY_RSA1: |
4fe2af09 | 59 | case KEY_RSA: |
b775c6f2 | 60 | if ((rsa = RSA_new()) == NULL) |
61 | fatal("key_new: RSA_new failed"); | |
62 | if ((rsa->n = BN_new()) == NULL) | |
63 | fatal("key_new: BN_new failed"); | |
64 | if ((rsa->e = BN_new()) == NULL) | |
65 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 66 | k->rsa = rsa; |
67 | break; | |
68 | case KEY_DSA: | |
b775c6f2 | 69 | if ((dsa = DSA_new()) == NULL) |
70 | fatal("key_new: DSA_new failed"); | |
71 | if ((dsa->p = BN_new()) == NULL) | |
72 | fatal("key_new: BN_new failed"); | |
73 | if ((dsa->q = BN_new()) == NULL) | |
74 | fatal("key_new: BN_new failed"); | |
75 | if ((dsa->g = BN_new()) == NULL) | |
76 | fatal("key_new: BN_new failed"); | |
77 | if ((dsa->pub_key = BN_new()) == NULL) | |
78 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 79 | k->dsa = dsa; |
80 | break; | |
fa08c86b | 81 | case KEY_UNSPEC: |
4fe2af09 | 82 | break; |
83 | default: | |
84 | fatal("key_new: bad key type %d", k->type); | |
85 | break; | |
86 | } | |
87 | return k; | |
88 | } | |
3ddc795d | 89 | |
fa08c86b | 90 | Key * |
91 | key_new_private(int type) | |
92 | { | |
93 | Key *k = key_new(type); | |
94 | switch (k->type) { | |
95 | case KEY_RSA1: | |
96 | case KEY_RSA: | |
b775c6f2 | 97 | if ((k->rsa->d = BN_new()) == NULL) |
98 | fatal("key_new_private: BN_new failed"); | |
99 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
100 | fatal("key_new_private: BN_new failed"); | |
101 | if ((k->rsa->q = BN_new()) == NULL) | |
102 | fatal("key_new_private: BN_new failed"); | |
103 | if ((k->rsa->p = BN_new()) == NULL) | |
104 | fatal("key_new_private: BN_new failed"); | |
105 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
106 | fatal("key_new_private: BN_new failed"); | |
107 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
108 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 109 | break; |
110 | case KEY_DSA: | |
b775c6f2 | 111 | if ((k->dsa->priv_key = BN_new()) == NULL) |
112 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 113 | break; |
114 | case KEY_UNSPEC: | |
115 | break; | |
116 | default: | |
117 | break; | |
118 | } | |
119 | return k; | |
120 | } | |
3ddc795d | 121 | |
4fe2af09 | 122 | void |
123 | key_free(Key *k) | |
124 | { | |
7016f7cf | 125 | if (k == NULL) |
126 | fatal("key_free: key is NULL); | |
4fe2af09 | 127 | switch (k->type) { |
fa08c86b | 128 | case KEY_RSA1: |
4fe2af09 | 129 | case KEY_RSA: |
130 | if (k->rsa != NULL) | |
131 | RSA_free(k->rsa); | |
132 | k->rsa = NULL; | |
133 | break; | |
134 | case KEY_DSA: | |
135 | if (k->dsa != NULL) | |
136 | DSA_free(k->dsa); | |
137 | k->dsa = NULL; | |
138 | break; | |
fa08c86b | 139 | case KEY_UNSPEC: |
140 | break; | |
4fe2af09 | 141 | default: |
142 | fatal("key_free: bad key type %d", k->type); | |
143 | break; | |
144 | } | |
145 | xfree(k); | |
146 | } | |
b6c7b7b7 | 147 | |
4fe2af09 | 148 | int |
b6c7b7b7 | 149 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 150 | { |
151 | if (a == NULL || b == NULL || a->type != b->type) | |
152 | return 0; | |
153 | switch (a->type) { | |
fa08c86b | 154 | case KEY_RSA1: |
4fe2af09 | 155 | case KEY_RSA: |
156 | return a->rsa != NULL && b->rsa != NULL && | |
157 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
158 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
159 | break; | |
160 | case KEY_DSA: | |
161 | return a->dsa != NULL && b->dsa != NULL && | |
162 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
163 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
164 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
165 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
166 | break; | |
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 | break; |
214 | default: | |
301e8e5b | 215 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 216 | break; |
217 | } | |
a306f2dd | 218 | if (blob != NULL) { |
301e8e5b | 219 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 220 | EVP_DigestInit(&ctx, md); |
221 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 222 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 223 | memset(blob, 0, len); |
224 | xfree(blob); | |
301e8e5b | 225 | } else { |
226 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 227 | } |
228 | return retval; | |
229 | } | |
230 | ||
343288b8 | 231 | static char * |
232 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 233 | { |
234 | char *retval; | |
2ceb8101 | 235 | u_int i; |
301e8e5b | 236 | |
a88b7b57 | 237 | retval = xmalloc(dgst_raw_len * 3 + 1); |
301e8e5b | 238 | retval[0] = '\0'; |
184eed6a | 239 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 240 | char hex[4]; |
241 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 242 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 243 | } |
956b0f56 | 244 | |
245 | /* Remove the trailing ':' character */ | |
301e8e5b | 246 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
247 | return retval; | |
248 | } | |
249 | ||
343288b8 | 250 | static char * |
251 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 252 | { |
253 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
254 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
255 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 256 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 257 | char *retval; |
258 | ||
259 | rounds = (dgst_raw_len / 2) + 1; | |
260 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
08345971 | 261 | retval[j++] = 'x'; |
262 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 263 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 264 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
265 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 266 | seed) % 6; |
08345971 | 267 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
268 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 269 | (seed / 6)) % 6; |
08345971 | 270 | retval[j++] = vowels[idx0]; |
271 | retval[j++] = consonants[idx1]; | |
272 | retval[j++] = vowels[idx2]; | |
273 | if ((i + 1) < rounds) { | |
274 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
275 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
276 | retval[j++] = consonants[idx3]; | |
277 | retval[j++] = '-'; | |
278 | retval[j++] = consonants[idx4]; | |
301e8e5b | 279 | seed = ((seed * 5) + |
08345971 | 280 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
281 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 282 | } |
283 | } else { | |
284 | idx0 = seed % 6; | |
285 | idx1 = 16; | |
286 | idx2 = seed / 6; | |
08345971 | 287 | retval[j++] = vowels[idx0]; |
288 | retval[j++] = consonants[idx1]; | |
289 | retval[j++] = vowels[idx2]; | |
301e8e5b | 290 | } |
291 | } | |
08345971 | 292 | retval[j++] = 'x'; |
293 | retval[j++] = '\0'; | |
301e8e5b | 294 | return retval; |
295 | } | |
296 | ||
343288b8 | 297 | char * |
b6c7b7b7 | 298 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 299 | { |
cd332296 | 300 | char *retval = NULL; |
301e8e5b | 301 | u_char *dgst_raw; |
a209a158 | 302 | u_int dgst_raw_len; |
184eed6a | 303 | |
301e8e5b | 304 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
305 | if (!dgst_raw) | |
22138a36 | 306 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 307 | switch (dgst_rep) { |
301e8e5b | 308 | case SSH_FP_HEX: |
309 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
310 | break; | |
311 | case SSH_FP_BUBBLEBABBLE: | |
312 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
313 | break; | |
314 | default: | |
315 | fatal("key_fingerprint_ex: bad digest representation %d", | |
316 | dgst_rep); | |
317 | break; | |
318 | } | |
319 | memset(dgst_raw, 0, dgst_raw_len); | |
320 | xfree(dgst_raw); | |
321 | return retval; | |
322 | } | |
323 | ||
4fe2af09 | 324 | /* |
325 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
326 | * the pointer. The integer must already be initialized. This function is | |
327 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
328 | * last processed (and maybe modified) character. Note that this may modify | |
329 | * the buffer containing the number. | |
330 | */ | |
396c147e | 331 | static int |
4fe2af09 | 332 | read_bignum(char **cpp, BIGNUM * value) |
333 | { | |
334 | char *cp = *cpp; | |
335 | int old; | |
336 | ||
337 | /* Skip any leading whitespace. */ | |
338 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
339 | ; | |
340 | ||
341 | /* Check that it begins with a decimal digit. */ | |
342 | if (*cp < '0' || *cp > '9') | |
343 | return 0; | |
344 | ||
345 | /* Save starting position. */ | |
346 | *cpp = cp; | |
347 | ||
348 | /* Move forward until all decimal digits skipped. */ | |
349 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
350 | ; | |
351 | ||
352 | /* Save the old terminating character, and replace it by \0. */ | |
353 | old = *cp; | |
354 | *cp = 0; | |
355 | ||
356 | /* Parse the number. */ | |
357 | if (BN_dec2bn(&value, *cpp) == 0) | |
358 | return 0; | |
359 | ||
360 | /* Restore old terminating character. */ | |
361 | *cp = old; | |
362 | ||
363 | /* Move beyond the number and return success. */ | |
364 | *cpp = cp; | |
365 | return 1; | |
366 | } | |
3ddc795d | 367 | |
396c147e | 368 | static int |
4fe2af09 | 369 | write_bignum(FILE *f, BIGNUM *num) |
370 | { | |
371 | char *buf = BN_bn2dec(num); | |
372 | if (buf == NULL) { | |
373 | error("write_bignum: BN_bn2dec() failed"); | |
374 | return 0; | |
375 | } | |
376 | fprintf(f, " %s", buf); | |
c48c32c1 | 377 | OPENSSL_free(buf); |
4fe2af09 | 378 | return 1; |
379 | } | |
fa08c86b | 380 | |
cb8c7bad | 381 | /* returns 1 ok, -1 error */ |
fa08c86b | 382 | int |
a306f2dd | 383 | key_read(Key *ret, char **cpp) |
4fe2af09 | 384 | { |
a306f2dd | 385 | Key *k; |
fa08c86b | 386 | int success = -1; |
387 | char *cp, *space; | |
388 | int len, n, type; | |
389 | u_int bits; | |
1e3b8b07 | 390 | u_char *blob; |
a306f2dd | 391 | |
392 | cp = *cpp; | |
393 | ||
6aacefa7 | 394 | switch (ret->type) { |
fa08c86b | 395 | case KEY_RSA1: |
a306f2dd | 396 | /* Get number of bits. */ |
397 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 398 | return -1; /* Bad bit count... */ |
a306f2dd | 399 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
400 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 401 | if (bits == 0) |
fa08c86b | 402 | return -1; |
a306f2dd | 403 | *cpp = cp; |
4fe2af09 | 404 | /* Get public exponent, public modulus. */ |
405 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 406 | return -1; |
4fe2af09 | 407 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 408 | return -1; |
409 | success = 1; | |
4fe2af09 | 410 | break; |
fa08c86b | 411 | case KEY_UNSPEC: |
412 | case KEY_RSA: | |
4fe2af09 | 413 | case KEY_DSA: |
fa08c86b | 414 | space = strchr(cp, ' '); |
415 | if (space == NULL) { | |
79cfe67c | 416 | debug3("key_read: missing whitespace"); |
fa08c86b | 417 | return -1; |
418 | } | |
419 | *space = '\0'; | |
420 | type = key_type_from_name(cp); | |
421 | *space = ' '; | |
422 | if (type == KEY_UNSPEC) { | |
79cfe67c | 423 | debug3("key_read: missing keytype"); |
fa08c86b | 424 | return -1; |
425 | } | |
426 | cp = space+1; | |
427 | if (*cp == '\0') { | |
428 | debug3("key_read: short string"); | |
429 | return -1; | |
430 | } | |
431 | if (ret->type == KEY_UNSPEC) { | |
432 | ret->type = type; | |
433 | } else if (ret->type != type) { | |
434 | /* is a key, but different type */ | |
435 | debug3("key_read: type mismatch"); | |
cb8c7bad | 436 | return -1; |
fa08c86b | 437 | } |
a306f2dd | 438 | len = 2*strlen(cp); |
439 | blob = xmalloc(len); | |
440 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 441 | if (n < 0) { |
71276795 | 442 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 443 | xfree(blob); |
fa08c86b | 444 | return -1; |
1d1ffb87 | 445 | } |
a27002e5 | 446 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 447 | xfree(blob); |
71276795 | 448 | if (k == NULL) { |
fa08c86b | 449 | error("key_read: key_from_blob %s failed", cp); |
450 | return -1; | |
71276795 | 451 | } |
fa08c86b | 452 | if (k->type != type) { |
453 | error("key_read: type mismatch: encoding error"); | |
454 | key_free(k); | |
455 | return -1; | |
456 | } | |
457 | /*XXXX*/ | |
458 | if (ret->type == KEY_RSA) { | |
459 | if (ret->rsa != NULL) | |
460 | RSA_free(ret->rsa); | |
461 | ret->rsa = k->rsa; | |
462 | k->rsa = NULL; | |
463 | success = 1; | |
464 | #ifdef DEBUG_PK | |
465 | RSA_print_fp(stderr, ret->rsa, 8); | |
466 | #endif | |
467 | } else { | |
468 | if (ret->dsa != NULL) | |
469 | DSA_free(ret->dsa); | |
470 | ret->dsa = k->dsa; | |
471 | k->dsa = NULL; | |
472 | success = 1; | |
473 | #ifdef DEBUG_PK | |
474 | DSA_print_fp(stderr, ret->dsa, 8); | |
475 | #endif | |
476 | } | |
477 | /*XXXX*/ | |
2f98d223 | 478 | key_free(k); |
fa08c86b | 479 | if (success != 1) |
480 | break; | |
71276795 | 481 | /* advance cp: skip whitespace and data */ |
482 | while (*cp == ' ' || *cp == '\t') | |
483 | cp++; | |
484 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
485 | cp++; | |
486 | *cpp = cp; | |
4fe2af09 | 487 | break; |
488 | default: | |
a306f2dd | 489 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 490 | break; |
491 | } | |
fa08c86b | 492 | return success; |
4fe2af09 | 493 | } |
3ddc795d | 494 | |
4fe2af09 | 495 | int |
b6c7b7b7 | 496 | key_write(const Key *key, FILE *f) |
4fe2af09 | 497 | { |
c66f9d0e | 498 | int n, success = 0; |
499 | u_int len, bits = 0; | |
661e45a0 | 500 | u_char *blob; |
501 | char *uu; | |
4fe2af09 | 502 | |
fa08c86b | 503 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 504 | /* size of modulus 'n' */ |
505 | bits = BN_num_bits(key->rsa->n); | |
506 | fprintf(f, "%u", bits); | |
507 | if (write_bignum(f, key->rsa->e) && | |
508 | write_bignum(f, key->rsa->n)) { | |
509 | success = 1; | |
510 | } else { | |
511 | error("key_write: failed for RSA key"); | |
512 | } | |
fa08c86b | 513 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
514 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 515 | key_to_blob(key, &blob, &len); |
a306f2dd | 516 | uu = xmalloc(2*len); |
1d1ffb87 | 517 | n = uuencode(blob, len, uu, 2*len); |
518 | if (n > 0) { | |
fa08c86b | 519 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 520 | success = 1; |
521 | } | |
a306f2dd | 522 | xfree(blob); |
523 | xfree(uu); | |
4fe2af09 | 524 | } |
525 | return success; | |
526 | } | |
3ddc795d | 527 | |
b6c7b7b7 | 528 | const char * |
529 | key_type(const Key *k) | |
1d1ffb87 | 530 | { |
531 | switch (k->type) { | |
fa08c86b | 532 | case KEY_RSA1: |
533 | return "RSA1"; | |
534 | break; | |
1d1ffb87 | 535 | case KEY_RSA: |
536 | return "RSA"; | |
537 | break; | |
538 | case KEY_DSA: | |
539 | return "DSA"; | |
540 | break; | |
541 | } | |
542 | return "unknown"; | |
543 | } | |
3ddc795d | 544 | |
b6c7b7b7 | 545 | const char * |
546 | key_ssh_name(const Key *k) | |
fa08c86b | 547 | { |
548 | switch (k->type) { | |
549 | case KEY_RSA: | |
550 | return "ssh-rsa"; | |
551 | break; | |
552 | case KEY_DSA: | |
553 | return "ssh-dss"; | |
554 | break; | |
555 | } | |
556 | return "ssh-unknown"; | |
557 | } | |
3ddc795d | 558 | |
fa08c86b | 559 | u_int |
b6c7b7b7 | 560 | key_size(const Key *k) |
6aacefa7 | 561 | { |
2e73a022 | 562 | switch (k->type) { |
fa08c86b | 563 | case KEY_RSA1: |
2e73a022 | 564 | case KEY_RSA: |
565 | return BN_num_bits(k->rsa->n); | |
566 | break; | |
567 | case KEY_DSA: | |
568 | return BN_num_bits(k->dsa->p); | |
569 | break; | |
570 | } | |
571 | return 0; | |
572 | } | |
fa08c86b | 573 | |
396c147e | 574 | static RSA * |
1e3b8b07 | 575 | rsa_generate_private_key(u_int bits) |
fa08c86b | 576 | { |
2b87da3b | 577 | RSA *private; |
578 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
579 | if (private == NULL) | |
580 | fatal("rsa_generate_private_key: key generation failed."); | |
581 | return private; | |
fa08c86b | 582 | } |
583 | ||
396c147e | 584 | static DSA* |
1e3b8b07 | 585 | dsa_generate_private_key(u_int bits) |
fa08c86b | 586 | { |
587 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
588 | if (private == NULL) | |
589 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
590 | if (!DSA_generate_key(private)) | |
2b87da3b | 591 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
592 | if (private == NULL) | |
593 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 594 | return private; |
595 | } | |
596 | ||
597 | Key * | |
1e3b8b07 | 598 | key_generate(int type, u_int bits) |
fa08c86b | 599 | { |
600 | Key *k = key_new(KEY_UNSPEC); | |
601 | switch (type) { | |
2b87da3b | 602 | case KEY_DSA: |
fa08c86b | 603 | k->dsa = dsa_generate_private_key(bits); |
604 | break; | |
605 | case KEY_RSA: | |
606 | case KEY_RSA1: | |
607 | k->rsa = rsa_generate_private_key(bits); | |
608 | break; | |
609 | default: | |
2b87da3b | 610 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 611 | } |
2b87da3b | 612 | k->type = type; |
fa08c86b | 613 | return k; |
614 | } | |
615 | ||
616 | Key * | |
b6c7b7b7 | 617 | key_from_private(const Key *k) |
fa08c86b | 618 | { |
619 | Key *n = NULL; | |
620 | switch (k->type) { | |
2b87da3b | 621 | case KEY_DSA: |
fa08c86b | 622 | n = key_new(k->type); |
623 | BN_copy(n->dsa->p, k->dsa->p); | |
624 | BN_copy(n->dsa->q, k->dsa->q); | |
625 | BN_copy(n->dsa->g, k->dsa->g); | |
626 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
627 | break; | |
628 | case KEY_RSA: | |
629 | case KEY_RSA1: | |
630 | n = key_new(k->type); | |
631 | BN_copy(n->rsa->n, k->rsa->n); | |
632 | BN_copy(n->rsa->e, k->rsa->e); | |
633 | break; | |
634 | default: | |
2b87da3b | 635 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 636 | break; |
637 | } | |
638 | return n; | |
639 | } | |
640 | ||
641 | int | |
642 | key_type_from_name(char *name) | |
643 | { | |
6aacefa7 | 644 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 645 | return KEY_RSA1; |
6aacefa7 | 646 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 647 | return KEY_RSA; |
6aacefa7 | 648 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 649 | return KEY_DSA; |
6aacefa7 | 650 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 651 | return KEY_RSA; |
6aacefa7 | 652 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 653 | return KEY_DSA; |
654 | } | |
539af7f5 | 655 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 656 | return KEY_UNSPEC; |
657 | } | |
658 | ||
e961a8f9 | 659 | int |
660 | key_names_valid2(const char *names) | |
661 | { | |
662 | char *s, *cp, *p; | |
663 | ||
664 | if (names == NULL || strcmp(names, "") == 0) | |
665 | return 0; | |
666 | s = cp = xstrdup(names); | |
667 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 668 | (p = strsep(&cp, ","))) { |
e961a8f9 | 669 | switch (key_type_from_name(p)) { |
670 | case KEY_RSA1: | |
671 | case KEY_UNSPEC: | |
672 | xfree(s); | |
673 | return 0; | |
674 | } | |
675 | } | |
676 | debug3("key names ok: [%s]", names); | |
677 | xfree(s); | |
678 | return 1; | |
679 | } | |
680 | ||
fa08c86b | 681 | Key * |
b6c7b7b7 | 682 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 683 | { |
684 | Buffer b; | |
fa08c86b | 685 | int rlen, type; |
63488674 | 686 | char *ktype = NULL; |
fa08c86b | 687 | Key *key = NULL; |
688 | ||
689 | #ifdef DEBUG_PK | |
690 | dump_base64(stderr, blob, blen); | |
691 | #endif | |
692 | buffer_init(&b); | |
693 | buffer_append(&b, blob, blen); | |
63488674 | 694 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
695 | error("key_from_blob: can't read key type"); | |
696 | goto out; | |
697 | } | |
698 | ||
fa08c86b | 699 | type = key_type_from_name(ktype); |
700 | ||
6aacefa7 | 701 | switch (type) { |
fa08c86b | 702 | case KEY_RSA: |
703 | key = key_new(type); | |
63488674 | 704 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
705 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
706 | error("key_from_blob: can't read rsa key"); | |
707 | key_free(key); | |
708 | key = NULL; | |
709 | goto out; | |
710 | } | |
fa08c86b | 711 | #ifdef DEBUG_PK |
712 | RSA_print_fp(stderr, key->rsa, 8); | |
713 | #endif | |
714 | break; | |
715 | case KEY_DSA: | |
716 | key = key_new(type); | |
63488674 | 717 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
718 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
719 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
720 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
721 | error("key_from_blob: can't read dsa key"); | |
722 | key_free(key); | |
723 | key = NULL; | |
724 | goto out; | |
725 | } | |
fa08c86b | 726 | #ifdef DEBUG_PK |
727 | DSA_print_fp(stderr, key->dsa, 8); | |
728 | #endif | |
729 | break; | |
730 | case KEY_UNSPEC: | |
731 | key = key_new(type); | |
732 | break; | |
733 | default: | |
734 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 735 | goto out; |
fa08c86b | 736 | } |
737 | rlen = buffer_len(&b); | |
738 | if (key != NULL && rlen != 0) | |
739 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 740 | out: |
741 | if (ktype != NULL) | |
742 | xfree(ktype); | |
fa08c86b | 743 | buffer_free(&b); |
744 | return key; | |
745 | } | |
746 | ||
747 | int | |
b6c7b7b7 | 748 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 749 | { |
750 | Buffer b; | |
751 | int len; | |
fa08c86b | 752 | |
753 | if (key == NULL) { | |
754 | error("key_to_blob: key == NULL"); | |
755 | return 0; | |
756 | } | |
757 | buffer_init(&b); | |
6aacefa7 | 758 | switch (key->type) { |
fa08c86b | 759 | case KEY_DSA: |
760 | buffer_put_cstring(&b, key_ssh_name(key)); | |
761 | buffer_put_bignum2(&b, key->dsa->p); | |
762 | buffer_put_bignum2(&b, key->dsa->q); | |
763 | buffer_put_bignum2(&b, key->dsa->g); | |
764 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
765 | break; | |
766 | case KEY_RSA: | |
767 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 768 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 769 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 770 | break; |
771 | default: | |
f7436b8c | 772 | error("key_to_blob: unsupported key type %d", key->type); |
773 | buffer_free(&b); | |
774 | return 0; | |
fa08c86b | 775 | } |
776 | len = buffer_len(&b); | |
fa08c86b | 777 | if (lenp != NULL) |
778 | *lenp = len; | |
eb9f2fab | 779 | if (blobp != NULL) { |
780 | *blobp = xmalloc(len); | |
781 | memcpy(*blobp, buffer_ptr(&b), len); | |
782 | } | |
783 | memset(buffer_ptr(&b), 0, len); | |
784 | buffer_free(&b); | |
fa08c86b | 785 | return len; |
786 | } | |
787 | ||
788 | int | |
789 | key_sign( | |
b6c7b7b7 | 790 | const Key *key, |
c66f9d0e | 791 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 792 | const u_char *data, u_int datalen) |
fa08c86b | 793 | { |
6aacefa7 | 794 | switch (key->type) { |
fa08c86b | 795 | case KEY_DSA: |
796 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
797 | break; | |
798 | case KEY_RSA: | |
799 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
800 | break; | |
801 | default: | |
d77347cc | 802 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 803 | return -1; |
804 | break; | |
805 | } | |
806 | } | |
807 | ||
3ed81c99 | 808 | /* |
809 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
810 | * and -1 on error. | |
811 | */ | |
fa08c86b | 812 | int |
813 | key_verify( | |
b6c7b7b7 | 814 | const Key *key, |
815 | const u_char *signature, u_int signaturelen, | |
816 | const u_char *data, u_int datalen) | |
fa08c86b | 817 | { |
c10d042a | 818 | if (signaturelen == 0) |
819 | return -1; | |
820 | ||
6aacefa7 | 821 | switch (key->type) { |
fa08c86b | 822 | case KEY_DSA: |
823 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
824 | break; | |
825 | case KEY_RSA: | |
826 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
827 | break; | |
828 | default: | |
d77347cc | 829 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 830 | return -1; |
831 | break; | |
832 | } | |
833 | } | |
d0074658 | 834 | |
835 | /* Converts a private to a public key */ | |
d0074658 | 836 | Key * |
b6c7b7b7 | 837 | key_demote(const Key *k) |
d0074658 | 838 | { |
839 | Key *pk; | |
762715ce | 840 | |
d0074658 | 841 | pk = xmalloc(sizeof(*pk)); |
842 | pk->type = k->type; | |
843 | pk->flags = k->flags; | |
844 | pk->dsa = NULL; | |
845 | pk->rsa = NULL; | |
846 | ||
847 | switch (k->type) { | |
848 | case KEY_RSA1: | |
849 | case KEY_RSA: | |
850 | if ((pk->rsa = RSA_new()) == NULL) | |
851 | fatal("key_demote: RSA_new failed"); | |
852 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
853 | fatal("key_demote: BN_dup failed"); | |
854 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
855 | fatal("key_demote: BN_dup failed"); | |
856 | break; | |
857 | case KEY_DSA: | |
858 | if ((pk->dsa = DSA_new()) == NULL) | |
859 | fatal("key_demote: DSA_new failed"); | |
860 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
861 | fatal("key_demote: BN_dup failed"); | |
862 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
863 | fatal("key_demote: BN_dup failed"); | |
864 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
865 | fatal("key_demote: BN_dup failed"); | |
866 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
867 | fatal("key_demote: BN_dup failed"); | |
868 | break; | |
869 | default: | |
870 | fatal("key_free: bad key type %d", k->type); | |
871 | break; | |
872 | } | |
873 | ||
874 | return (pk); | |
875 | } |