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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; | |
52e3daed | 52 | k = xcalloc(1, sizeof(*k)); |
4fe2af09 | 53 | k->type = type; |
a306f2dd | 54 | k->dsa = NULL; |
55 | k->rsa = NULL; | |
4fe2af09 | 56 | switch (k->type) { |
fa08c86b | 57 | case KEY_RSA1: |
4fe2af09 | 58 | case KEY_RSA: |
b775c6f2 | 59 | if ((rsa = RSA_new()) == NULL) |
60 | fatal("key_new: RSA_new failed"); | |
61 | if ((rsa->n = BN_new()) == NULL) | |
62 | fatal("key_new: BN_new failed"); | |
63 | if ((rsa->e = BN_new()) == NULL) | |
64 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 65 | k->rsa = rsa; |
66 | break; | |
67 | case KEY_DSA: | |
b775c6f2 | 68 | if ((dsa = DSA_new()) == NULL) |
69 | fatal("key_new: DSA_new failed"); | |
70 | if ((dsa->p = BN_new()) == NULL) | |
71 | fatal("key_new: BN_new failed"); | |
72 | if ((dsa->q = BN_new()) == NULL) | |
73 | fatal("key_new: BN_new failed"); | |
74 | if ((dsa->g = BN_new()) == NULL) | |
75 | fatal("key_new: BN_new failed"); | |
76 | if ((dsa->pub_key = BN_new()) == NULL) | |
77 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 78 | k->dsa = dsa; |
79 | break; | |
fa08c86b | 80 | case KEY_UNSPEC: |
4fe2af09 | 81 | break; |
82 | default: | |
83 | fatal("key_new: bad key type %d", k->type); | |
84 | break; | |
85 | } | |
86 | return k; | |
87 | } | |
3ddc795d | 88 | |
fa08c86b | 89 | Key * |
90 | key_new_private(int type) | |
91 | { | |
92 | Key *k = key_new(type); | |
93 | switch (k->type) { | |
94 | case KEY_RSA1: | |
95 | case KEY_RSA: | |
b775c6f2 | 96 | if ((k->rsa->d = BN_new()) == NULL) |
97 | fatal("key_new_private: BN_new failed"); | |
98 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
99 | fatal("key_new_private: BN_new failed"); | |
100 | if ((k->rsa->q = BN_new()) == NULL) | |
101 | fatal("key_new_private: BN_new failed"); | |
102 | if ((k->rsa->p = BN_new()) == NULL) | |
103 | fatal("key_new_private: BN_new failed"); | |
104 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
105 | fatal("key_new_private: BN_new failed"); | |
106 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
107 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 108 | break; |
109 | case KEY_DSA: | |
b775c6f2 | 110 | if ((k->dsa->priv_key = BN_new()) == NULL) |
111 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 112 | break; |
113 | case KEY_UNSPEC: | |
114 | break; | |
115 | default: | |
116 | break; | |
117 | } | |
118 | return k; | |
119 | } | |
3ddc795d | 120 | |
4fe2af09 | 121 | void |
122 | key_free(Key *k) | |
123 | { | |
7016f7cf | 124 | if (k == NULL) |
353d48db | 125 | fatal("key_free: key is NULL"); |
4fe2af09 | 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 | } | |
b6c7b7b7 | 146 | |
4fe2af09 | 147 | int |
b6c7b7b7 | 148 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 149 | { |
150 | if (a == NULL || b == NULL || a->type != b->type) | |
151 | return 0; | |
152 | switch (a->type) { | |
fa08c86b | 153 | case KEY_RSA1: |
4fe2af09 | 154 | case KEY_RSA: |
155 | return a->rsa != NULL && b->rsa != NULL && | |
156 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
157 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
4fe2af09 | 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; | |
4fe2af09 | 164 | default: |
a306f2dd | 165 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 166 | break; |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
21289cd0 | 171 | u_char* |
b6c7b7b7 | 172 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
173 | u_int *dgst_raw_length) | |
4fe2af09 | 174 | { |
714954dc | 175 | const EVP_MD *md = NULL; |
79c9ac1b | 176 | EVP_MD_CTX ctx; |
1e3b8b07 | 177 | u_char *blob = NULL; |
301e8e5b | 178 | u_char *retval = NULL; |
c66f9d0e | 179 | u_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 | default: |
301e8e5b | 211 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 212 | break; |
213 | } | |
a306f2dd | 214 | if (blob != NULL) { |
301e8e5b | 215 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 216 | EVP_DigestInit(&ctx, md); |
217 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 218 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 219 | memset(blob, 0, len); |
220 | xfree(blob); | |
301e8e5b | 221 | } else { |
222 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 223 | } |
224 | return retval; | |
225 | } | |
226 | ||
343288b8 | 227 | static char * |
228 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 229 | { |
230 | char *retval; | |
2ceb8101 | 231 | u_int i; |
301e8e5b | 232 | |
52e3daed | 233 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
184eed6a | 234 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 235 | char hex[4]; |
236 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 237 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 238 | } |
956b0f56 | 239 | |
240 | /* Remove the trailing ':' character */ | |
301e8e5b | 241 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
242 | return retval; | |
243 | } | |
244 | ||
343288b8 | 245 | static char * |
246 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 247 | { |
248 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
249 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
250 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 251 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 252 | char *retval; |
253 | ||
254 | rounds = (dgst_raw_len / 2) + 1; | |
52e3daed | 255 | retval = xcalloc((rounds * 6), sizeof(char)); |
08345971 | 256 | retval[j++] = 'x'; |
257 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 258 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 259 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
260 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 261 | seed) % 6; |
08345971 | 262 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
263 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 264 | (seed / 6)) % 6; |
08345971 | 265 | retval[j++] = vowels[idx0]; |
266 | retval[j++] = consonants[idx1]; | |
267 | retval[j++] = vowels[idx2]; | |
268 | if ((i + 1) < rounds) { | |
269 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
270 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
271 | retval[j++] = consonants[idx3]; | |
272 | retval[j++] = '-'; | |
273 | retval[j++] = consonants[idx4]; | |
301e8e5b | 274 | seed = ((seed * 5) + |
08345971 | 275 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
276 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 277 | } |
278 | } else { | |
279 | idx0 = seed % 6; | |
280 | idx1 = 16; | |
281 | idx2 = seed / 6; | |
08345971 | 282 | retval[j++] = vowels[idx0]; |
283 | retval[j++] = consonants[idx1]; | |
284 | retval[j++] = vowels[idx2]; | |
301e8e5b | 285 | } |
286 | } | |
08345971 | 287 | retval[j++] = 'x'; |
288 | retval[j++] = '\0'; | |
301e8e5b | 289 | return retval; |
290 | } | |
291 | ||
343288b8 | 292 | char * |
b6c7b7b7 | 293 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 294 | { |
cd332296 | 295 | char *retval = NULL; |
301e8e5b | 296 | u_char *dgst_raw; |
a209a158 | 297 | u_int dgst_raw_len; |
184eed6a | 298 | |
301e8e5b | 299 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
300 | if (!dgst_raw) | |
22138a36 | 301 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 302 | switch (dgst_rep) { |
301e8e5b | 303 | case SSH_FP_HEX: |
304 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
305 | break; | |
306 | case SSH_FP_BUBBLEBABBLE: | |
307 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
308 | break; | |
309 | default: | |
310 | fatal("key_fingerprint_ex: bad digest representation %d", | |
311 | dgst_rep); | |
312 | break; | |
313 | } | |
314 | memset(dgst_raw, 0, dgst_raw_len); | |
315 | xfree(dgst_raw); | |
316 | return retval; | |
317 | } | |
318 | ||
4fe2af09 | 319 | /* |
320 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
321 | * the pointer. The integer must already be initialized. This function is | |
322 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
323 | * last processed (and maybe modified) character. Note that this may modify | |
324 | * the buffer containing the number. | |
325 | */ | |
396c147e | 326 | static int |
4fe2af09 | 327 | read_bignum(char **cpp, BIGNUM * value) |
328 | { | |
329 | char *cp = *cpp; | |
330 | int old; | |
331 | ||
332 | /* Skip any leading whitespace. */ | |
333 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
334 | ; | |
335 | ||
336 | /* Check that it begins with a decimal digit. */ | |
337 | if (*cp < '0' || *cp > '9') | |
338 | return 0; | |
339 | ||
340 | /* Save starting position. */ | |
341 | *cpp = cp; | |
342 | ||
343 | /* Move forward until all decimal digits skipped. */ | |
344 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
345 | ; | |
346 | ||
347 | /* Save the old terminating character, and replace it by \0. */ | |
348 | old = *cp; | |
349 | *cp = 0; | |
350 | ||
351 | /* Parse the number. */ | |
352 | if (BN_dec2bn(&value, *cpp) == 0) | |
353 | return 0; | |
354 | ||
355 | /* Restore old terminating character. */ | |
356 | *cp = old; | |
357 | ||
358 | /* Move beyond the number and return success. */ | |
359 | *cpp = cp; | |
360 | return 1; | |
361 | } | |
3ddc795d | 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) { | |
79cfe67c | 411 | debug3("key_read: missing whitespace"); |
fa08c86b | 412 | return -1; |
413 | } | |
414 | *space = '\0'; | |
415 | type = key_type_from_name(cp); | |
416 | *space = ' '; | |
417 | if (type == KEY_UNSPEC) { | |
79cfe67c | 418 | debug3("key_read: missing keytype"); |
fa08c86b | 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 | } |
a27002e5 | 441 | k = key_from_blob(blob, (u_int)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 | } |
3ddc795d | 489 | |
4fe2af09 | 490 | int |
b6c7b7b7 | 491 | key_write(const Key *key, FILE *f) |
4fe2af09 | 492 | { |
c66f9d0e | 493 | int n, success = 0; |
494 | u_int len, bits = 0; | |
661e45a0 | 495 | u_char *blob; |
496 | char *uu; | |
4fe2af09 | 497 | |
fa08c86b | 498 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 499 | /* size of modulus 'n' */ |
500 | bits = BN_num_bits(key->rsa->n); | |
501 | fprintf(f, "%u", bits); | |
502 | if (write_bignum(f, key->rsa->e) && | |
503 | write_bignum(f, key->rsa->n)) { | |
504 | success = 1; | |
505 | } else { | |
506 | error("key_write: failed for RSA key"); | |
507 | } | |
fa08c86b | 508 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
509 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 510 | key_to_blob(key, &blob, &len); |
a306f2dd | 511 | uu = xmalloc(2*len); |
1d1ffb87 | 512 | n = uuencode(blob, len, uu, 2*len); |
513 | if (n > 0) { | |
fa08c86b | 514 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 515 | success = 1; |
516 | } | |
a306f2dd | 517 | xfree(blob); |
518 | xfree(uu); | |
4fe2af09 | 519 | } |
520 | return success; | |
521 | } | |
3ddc795d | 522 | |
b6c7b7b7 | 523 | const char * |
524 | key_type(const Key *k) | |
1d1ffb87 | 525 | { |
526 | switch (k->type) { | |
fa08c86b | 527 | case KEY_RSA1: |
528 | return "RSA1"; | |
1d1ffb87 | 529 | case KEY_RSA: |
530 | return "RSA"; | |
1d1ffb87 | 531 | case KEY_DSA: |
532 | return "DSA"; | |
1d1ffb87 | 533 | } |
534 | return "unknown"; | |
535 | } | |
3ddc795d | 536 | |
b6c7b7b7 | 537 | const char * |
538 | key_ssh_name(const Key *k) | |
fa08c86b | 539 | { |
540 | switch (k->type) { | |
541 | case KEY_RSA: | |
542 | return "ssh-rsa"; | |
fa08c86b | 543 | case KEY_DSA: |
544 | return "ssh-dss"; | |
fa08c86b | 545 | } |
546 | return "ssh-unknown"; | |
547 | } | |
3ddc795d | 548 | |
fa08c86b | 549 | u_int |
b6c7b7b7 | 550 | key_size(const Key *k) |
6aacefa7 | 551 | { |
2e73a022 | 552 | switch (k->type) { |
fa08c86b | 553 | case KEY_RSA1: |
2e73a022 | 554 | case KEY_RSA: |
555 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 556 | case KEY_DSA: |
557 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 558 | } |
559 | return 0; | |
560 | } | |
fa08c86b | 561 | |
396c147e | 562 | static RSA * |
1e3b8b07 | 563 | rsa_generate_private_key(u_int bits) |
fa08c86b | 564 | { |
2b87da3b | 565 | RSA *private; |
5ef36928 | 566 | |
2b87da3b | 567 | private = RSA_generate_key(bits, 35, NULL, NULL); |
568 | if (private == NULL) | |
569 | fatal("rsa_generate_private_key: key generation failed."); | |
570 | return private; | |
fa08c86b | 571 | } |
572 | ||
396c147e | 573 | static DSA* |
1e3b8b07 | 574 | dsa_generate_private_key(u_int bits) |
fa08c86b | 575 | { |
576 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 577 | |
fa08c86b | 578 | if (private == NULL) |
579 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
580 | if (!DSA_generate_key(private)) | |
2b87da3b | 581 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
582 | if (private == NULL) | |
583 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 584 | return private; |
585 | } | |
586 | ||
587 | Key * | |
1e3b8b07 | 588 | key_generate(int type, u_int bits) |
fa08c86b | 589 | { |
590 | Key *k = key_new(KEY_UNSPEC); | |
591 | switch (type) { | |
2b87da3b | 592 | case KEY_DSA: |
fa08c86b | 593 | k->dsa = dsa_generate_private_key(bits); |
594 | break; | |
595 | case KEY_RSA: | |
596 | case KEY_RSA1: | |
597 | k->rsa = rsa_generate_private_key(bits); | |
598 | break; | |
599 | default: | |
2b87da3b | 600 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 601 | } |
2b87da3b | 602 | k->type = type; |
fa08c86b | 603 | return k; |
604 | } | |
605 | ||
606 | Key * | |
b6c7b7b7 | 607 | key_from_private(const Key *k) |
fa08c86b | 608 | { |
609 | Key *n = NULL; | |
610 | switch (k->type) { | |
2b87da3b | 611 | case KEY_DSA: |
fa08c86b | 612 | n = key_new(k->type); |
613 | BN_copy(n->dsa->p, k->dsa->p); | |
614 | BN_copy(n->dsa->q, k->dsa->q); | |
615 | BN_copy(n->dsa->g, k->dsa->g); | |
616 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
617 | break; | |
618 | case KEY_RSA: | |
619 | case KEY_RSA1: | |
620 | n = key_new(k->type); | |
621 | BN_copy(n->rsa->n, k->rsa->n); | |
622 | BN_copy(n->rsa->e, k->rsa->e); | |
623 | break; | |
624 | default: | |
2b87da3b | 625 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 626 | break; |
627 | } | |
628 | return n; | |
629 | } | |
630 | ||
631 | int | |
632 | key_type_from_name(char *name) | |
633 | { | |
6aacefa7 | 634 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 635 | return KEY_RSA1; |
6aacefa7 | 636 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 637 | return KEY_RSA; |
6aacefa7 | 638 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 639 | return KEY_DSA; |
6aacefa7 | 640 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 641 | return KEY_RSA; |
6aacefa7 | 642 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 643 | return KEY_DSA; |
644 | } | |
539af7f5 | 645 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 646 | return KEY_UNSPEC; |
647 | } | |
648 | ||
e961a8f9 | 649 | int |
650 | key_names_valid2(const char *names) | |
651 | { | |
652 | char *s, *cp, *p; | |
653 | ||
654 | if (names == NULL || strcmp(names, "") == 0) | |
655 | return 0; | |
656 | s = cp = xstrdup(names); | |
657 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 658 | (p = strsep(&cp, ","))) { |
e961a8f9 | 659 | switch (key_type_from_name(p)) { |
660 | case KEY_RSA1: | |
661 | case KEY_UNSPEC: | |
662 | xfree(s); | |
663 | return 0; | |
664 | } | |
665 | } | |
666 | debug3("key names ok: [%s]", names); | |
667 | xfree(s); | |
668 | return 1; | |
669 | } | |
670 | ||
fa08c86b | 671 | Key * |
b6c7b7b7 | 672 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 673 | { |
674 | Buffer b; | |
fa08c86b | 675 | int rlen, type; |
63488674 | 676 | char *ktype = NULL; |
fa08c86b | 677 | Key *key = NULL; |
678 | ||
679 | #ifdef DEBUG_PK | |
680 | dump_base64(stderr, blob, blen); | |
681 | #endif | |
682 | buffer_init(&b); | |
683 | buffer_append(&b, blob, blen); | |
63488674 | 684 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
685 | error("key_from_blob: can't read key type"); | |
686 | goto out; | |
687 | } | |
688 | ||
fa08c86b | 689 | type = key_type_from_name(ktype); |
690 | ||
6aacefa7 | 691 | switch (type) { |
fa08c86b | 692 | case KEY_RSA: |
693 | key = key_new(type); | |
63488674 | 694 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
695 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
696 | error("key_from_blob: can't read rsa key"); | |
697 | key_free(key); | |
698 | key = NULL; | |
699 | goto out; | |
700 | } | |
fa08c86b | 701 | #ifdef DEBUG_PK |
702 | RSA_print_fp(stderr, key->rsa, 8); | |
703 | #endif | |
704 | break; | |
705 | case KEY_DSA: | |
706 | key = key_new(type); | |
63488674 | 707 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
708 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
709 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
710 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
711 | error("key_from_blob: can't read dsa key"); | |
712 | key_free(key); | |
713 | key = NULL; | |
714 | goto out; | |
715 | } | |
fa08c86b | 716 | #ifdef DEBUG_PK |
717 | DSA_print_fp(stderr, key->dsa, 8); | |
718 | #endif | |
719 | break; | |
720 | case KEY_UNSPEC: | |
721 | key = key_new(type); | |
722 | break; | |
723 | default: | |
724 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 725 | goto out; |
fa08c86b | 726 | } |
727 | rlen = buffer_len(&b); | |
728 | if (key != NULL && rlen != 0) | |
729 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 730 | out: |
731 | if (ktype != NULL) | |
732 | xfree(ktype); | |
fa08c86b | 733 | buffer_free(&b); |
734 | return key; | |
735 | } | |
736 | ||
737 | int | |
b6c7b7b7 | 738 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 739 | { |
740 | Buffer b; | |
741 | int len; | |
fa08c86b | 742 | |
743 | if (key == NULL) { | |
744 | error("key_to_blob: key == NULL"); | |
745 | return 0; | |
746 | } | |
747 | buffer_init(&b); | |
6aacefa7 | 748 | switch (key->type) { |
fa08c86b | 749 | case KEY_DSA: |
750 | buffer_put_cstring(&b, key_ssh_name(key)); | |
751 | buffer_put_bignum2(&b, key->dsa->p); | |
752 | buffer_put_bignum2(&b, key->dsa->q); | |
753 | buffer_put_bignum2(&b, key->dsa->g); | |
754 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
755 | break; | |
756 | case KEY_RSA: | |
757 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 758 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 759 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 760 | break; |
761 | default: | |
f7436b8c | 762 | error("key_to_blob: unsupported key type %d", key->type); |
763 | buffer_free(&b); | |
764 | return 0; | |
fa08c86b | 765 | } |
766 | len = buffer_len(&b); | |
fa08c86b | 767 | if (lenp != NULL) |
768 | *lenp = len; | |
eb9f2fab | 769 | if (blobp != NULL) { |
770 | *blobp = xmalloc(len); | |
771 | memcpy(*blobp, buffer_ptr(&b), len); | |
772 | } | |
773 | memset(buffer_ptr(&b), 0, len); | |
774 | buffer_free(&b); | |
fa08c86b | 775 | return len; |
776 | } | |
777 | ||
778 | int | |
779 | key_sign( | |
b6c7b7b7 | 780 | const Key *key, |
c66f9d0e | 781 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 782 | const u_char *data, u_int datalen) |
fa08c86b | 783 | { |
6aacefa7 | 784 | switch (key->type) { |
fa08c86b | 785 | case KEY_DSA: |
786 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 787 | case KEY_RSA: |
788 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 789 | default: |
d77347cc | 790 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 791 | return -1; |
fa08c86b | 792 | } |
793 | } | |
794 | ||
3ed81c99 | 795 | /* |
796 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
797 | * and -1 on error. | |
798 | */ | |
fa08c86b | 799 | int |
800 | key_verify( | |
b6c7b7b7 | 801 | const Key *key, |
802 | const u_char *signature, u_int signaturelen, | |
803 | const u_char *data, u_int datalen) | |
fa08c86b | 804 | { |
c10d042a | 805 | if (signaturelen == 0) |
806 | return -1; | |
807 | ||
6aacefa7 | 808 | switch (key->type) { |
fa08c86b | 809 | case KEY_DSA: |
810 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 811 | case KEY_RSA: |
812 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 813 | default: |
d77347cc | 814 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 815 | return -1; |
fa08c86b | 816 | } |
817 | } | |
d0074658 | 818 | |
819 | /* Converts a private to a public key */ | |
d0074658 | 820 | Key * |
b6c7b7b7 | 821 | key_demote(const Key *k) |
d0074658 | 822 | { |
823 | Key *pk; | |
762715ce | 824 | |
52e3daed | 825 | pk = xcalloc(1, sizeof(*pk)); |
d0074658 | 826 | pk->type = k->type; |
827 | pk->flags = k->flags; | |
828 | pk->dsa = NULL; | |
829 | pk->rsa = NULL; | |
830 | ||
831 | switch (k->type) { | |
832 | case KEY_RSA1: | |
833 | case KEY_RSA: | |
834 | if ((pk->rsa = RSA_new()) == NULL) | |
835 | fatal("key_demote: RSA_new failed"); | |
836 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
837 | fatal("key_demote: BN_dup failed"); | |
838 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
839 | fatal("key_demote: BN_dup failed"); | |
840 | break; | |
841 | case KEY_DSA: | |
842 | if ((pk->dsa = DSA_new()) == NULL) | |
843 | fatal("key_demote: DSA_new failed"); | |
844 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
845 | fatal("key_demote: BN_dup failed"); | |
846 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
847 | fatal("key_demote: BN_dup failed"); | |
848 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
849 | fatal("key_demote: BN_dup failed"); | |
850 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
851 | fatal("key_demote: BN_dup failed"); | |
852 | break; | |
853 | default: | |
854 | fatal("key_free: bad key type %d", k->type); | |
855 | break; | |
856 | } | |
857 | ||
858 | return (pk); | |
859 | } |