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cf851879 | 1 | /* $OpenBSD: key.c,v 1.66 2006/08/01 23:22:47 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 | |
cf851879 | 39 | #include <stdio.h> |
00146caa | 40 | #include <string.h> |
41 | ||
4fe2af09 | 42 | #include "xmalloc.h" |
43 | #include "key.h" | |
fa08c86b | 44 | #include "rsa.h" |
a306f2dd | 45 | #include "uuencode.h" |
fa08c86b | 46 | #include "buffer.h" |
47 | #include "bufaux.h" | |
42f11eb2 | 48 | #include "log.h" |
4fe2af09 | 49 | |
50 | Key * | |
51 | key_new(int type) | |
52 | { | |
53 | Key *k; | |
54 | RSA *rsa; | |
55 | DSA *dsa; | |
52e3daed | 56 | k = xcalloc(1, sizeof(*k)); |
4fe2af09 | 57 | k->type = type; |
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 | } | |
3ddc795d | 92 | |
fa08c86b | 93 | Key * |
94 | key_new_private(int type) | |
95 | { | |
96 | Key *k = key_new(type); | |
97 | switch (k->type) { | |
98 | case KEY_RSA1: | |
99 | case KEY_RSA: | |
b775c6f2 | 100 | if ((k->rsa->d = BN_new()) == NULL) |
101 | fatal("key_new_private: BN_new failed"); | |
102 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
103 | fatal("key_new_private: BN_new failed"); | |
104 | if ((k->rsa->q = BN_new()) == NULL) | |
105 | fatal("key_new_private: BN_new failed"); | |
106 | if ((k->rsa->p = BN_new()) == NULL) | |
107 | fatal("key_new_private: BN_new failed"); | |
108 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
109 | fatal("key_new_private: BN_new failed"); | |
110 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
111 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 112 | break; |
113 | case KEY_DSA: | |
b775c6f2 | 114 | if ((k->dsa->priv_key = BN_new()) == NULL) |
115 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 116 | break; |
117 | case KEY_UNSPEC: | |
118 | break; | |
119 | default: | |
120 | break; | |
121 | } | |
122 | return k; | |
123 | } | |
3ddc795d | 124 | |
4fe2af09 | 125 | void |
126 | key_free(Key *k) | |
127 | { | |
7016f7cf | 128 | if (k == NULL) |
353d48db | 129 | fatal("key_free: key is NULL"); |
4fe2af09 | 130 | switch (k->type) { |
fa08c86b | 131 | case KEY_RSA1: |
4fe2af09 | 132 | case KEY_RSA: |
133 | if (k->rsa != NULL) | |
134 | RSA_free(k->rsa); | |
135 | k->rsa = NULL; | |
136 | break; | |
137 | case KEY_DSA: | |
138 | if (k->dsa != NULL) | |
139 | DSA_free(k->dsa); | |
140 | k->dsa = NULL; | |
141 | break; | |
fa08c86b | 142 | case KEY_UNSPEC: |
143 | break; | |
4fe2af09 | 144 | default: |
145 | fatal("key_free: bad key type %d", k->type); | |
146 | break; | |
147 | } | |
148 | xfree(k); | |
149 | } | |
b6c7b7b7 | 150 | |
4fe2af09 | 151 | int |
b6c7b7b7 | 152 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 153 | { |
154 | if (a == NULL || b == NULL || a->type != b->type) | |
155 | return 0; | |
156 | switch (a->type) { | |
fa08c86b | 157 | case KEY_RSA1: |
4fe2af09 | 158 | case KEY_RSA: |
159 | return a->rsa != NULL && b->rsa != NULL && | |
160 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
161 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
4fe2af09 | 162 | case KEY_DSA: |
163 | return a->dsa != NULL && b->dsa != NULL && | |
164 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
165 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
166 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
167 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
4fe2af09 | 168 | default: |
a306f2dd | 169 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 170 | break; |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
21289cd0 | 175 | u_char* |
b6c7b7b7 | 176 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
177 | u_int *dgst_raw_length) | |
4fe2af09 | 178 | { |
714954dc | 179 | const EVP_MD *md = NULL; |
79c9ac1b | 180 | EVP_MD_CTX ctx; |
1e3b8b07 | 181 | u_char *blob = NULL; |
301e8e5b | 182 | u_char *retval = NULL; |
c66f9d0e | 183 | u_int len = 0; |
a306f2dd | 184 | int nlen, elen; |
4fe2af09 | 185 | |
301e8e5b | 186 | *dgst_raw_length = 0; |
187 | ||
79c9ac1b | 188 | switch (dgst_type) { |
189 | case SSH_FP_MD5: | |
190 | md = EVP_md5(); | |
191 | break; | |
192 | case SSH_FP_SHA1: | |
193 | md = EVP_sha1(); | |
194 | break; | |
195 | default: | |
196 | fatal("key_fingerprint_raw: bad digest type %d", | |
197 | dgst_type); | |
198 | } | |
4fe2af09 | 199 | switch (k->type) { |
fa08c86b | 200 | case KEY_RSA1: |
4fe2af09 | 201 | nlen = BN_num_bytes(k->rsa->n); |
202 | elen = BN_num_bytes(k->rsa->e); | |
203 | len = nlen + elen; | |
a306f2dd | 204 | blob = xmalloc(len); |
205 | BN_bn2bin(k->rsa->n, blob); | |
206 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 207 | break; |
208 | case KEY_DSA: | |
fa08c86b | 209 | case KEY_RSA: |
210 | key_to_blob(k, &blob, &len); | |
211 | break; | |
212 | case KEY_UNSPEC: | |
213 | return retval; | |
4fe2af09 | 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 | |
52e3daed | 237 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
184eed6a | 238 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 239 | char hex[4]; |
240 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 241 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 242 | } |
956b0f56 | 243 | |
244 | /* Remove the trailing ':' character */ | |
301e8e5b | 245 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
246 | return retval; | |
247 | } | |
248 | ||
343288b8 | 249 | static char * |
250 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 251 | { |
252 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
253 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
254 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 255 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 256 | char *retval; |
257 | ||
258 | rounds = (dgst_raw_len / 2) + 1; | |
52e3daed | 259 | retval = xcalloc((rounds * 6), sizeof(char)); |
08345971 | 260 | retval[j++] = 'x'; |
261 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 262 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 263 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
264 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 265 | seed) % 6; |
08345971 | 266 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
267 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 268 | (seed / 6)) % 6; |
08345971 | 269 | retval[j++] = vowels[idx0]; |
270 | retval[j++] = consonants[idx1]; | |
271 | retval[j++] = vowels[idx2]; | |
272 | if ((i + 1) < rounds) { | |
273 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
274 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
275 | retval[j++] = consonants[idx3]; | |
276 | retval[j++] = '-'; | |
277 | retval[j++] = consonants[idx4]; | |
301e8e5b | 278 | seed = ((seed * 5) + |
08345971 | 279 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
280 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 281 | } |
282 | } else { | |
283 | idx0 = seed % 6; | |
284 | idx1 = 16; | |
285 | idx2 = seed / 6; | |
08345971 | 286 | retval[j++] = vowels[idx0]; |
287 | retval[j++] = consonants[idx1]; | |
288 | retval[j++] = vowels[idx2]; | |
301e8e5b | 289 | } |
290 | } | |
08345971 | 291 | retval[j++] = 'x'; |
292 | retval[j++] = '\0'; | |
301e8e5b | 293 | return retval; |
294 | } | |
295 | ||
343288b8 | 296 | char * |
b6c7b7b7 | 297 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 298 | { |
cd332296 | 299 | char *retval = NULL; |
301e8e5b | 300 | u_char *dgst_raw; |
a209a158 | 301 | u_int dgst_raw_len; |
184eed6a | 302 | |
301e8e5b | 303 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
304 | if (!dgst_raw) | |
22138a36 | 305 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 306 | switch (dgst_rep) { |
301e8e5b | 307 | case SSH_FP_HEX: |
308 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
309 | break; | |
310 | case SSH_FP_BUBBLEBABBLE: | |
311 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
312 | break; | |
313 | default: | |
314 | fatal("key_fingerprint_ex: bad digest representation %d", | |
315 | dgst_rep); | |
316 | break; | |
317 | } | |
318 | memset(dgst_raw, 0, dgst_raw_len); | |
319 | xfree(dgst_raw); | |
320 | return retval; | |
321 | } | |
322 | ||
4fe2af09 | 323 | /* |
324 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
325 | * the pointer. The integer must already be initialized. This function is | |
326 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
327 | * last processed (and maybe modified) character. Note that this may modify | |
328 | * the buffer containing the number. | |
329 | */ | |
396c147e | 330 | static int |
4fe2af09 | 331 | read_bignum(char **cpp, BIGNUM * value) |
332 | { | |
333 | char *cp = *cpp; | |
334 | int old; | |
335 | ||
336 | /* Skip any leading whitespace. */ | |
337 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
338 | ; | |
339 | ||
340 | /* Check that it begins with a decimal digit. */ | |
341 | if (*cp < '0' || *cp > '9') | |
342 | return 0; | |
343 | ||
344 | /* Save starting position. */ | |
345 | *cpp = cp; | |
346 | ||
347 | /* Move forward until all decimal digits skipped. */ | |
348 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
349 | ; | |
350 | ||
351 | /* Save the old terminating character, and replace it by \0. */ | |
352 | old = *cp; | |
353 | *cp = 0; | |
354 | ||
355 | /* Parse the number. */ | |
356 | if (BN_dec2bn(&value, *cpp) == 0) | |
357 | return 0; | |
358 | ||
359 | /* Restore old terminating character. */ | |
360 | *cp = old; | |
361 | ||
362 | /* Move beyond the number and return success. */ | |
363 | *cpp = cp; | |
364 | return 1; | |
365 | } | |
3ddc795d | 366 | |
396c147e | 367 | static int |
4fe2af09 | 368 | write_bignum(FILE *f, BIGNUM *num) |
369 | { | |
370 | char *buf = BN_bn2dec(num); | |
371 | if (buf == NULL) { | |
372 | error("write_bignum: BN_bn2dec() failed"); | |
373 | return 0; | |
374 | } | |
375 | fprintf(f, " %s", buf); | |
c48c32c1 | 376 | OPENSSL_free(buf); |
4fe2af09 | 377 | return 1; |
378 | } | |
fa08c86b | 379 | |
cb8c7bad | 380 | /* returns 1 ok, -1 error */ |
fa08c86b | 381 | int |
a306f2dd | 382 | key_read(Key *ret, char **cpp) |
4fe2af09 | 383 | { |
a306f2dd | 384 | Key *k; |
fa08c86b | 385 | int success = -1; |
386 | char *cp, *space; | |
387 | int len, n, type; | |
388 | u_int bits; | |
1e3b8b07 | 389 | u_char *blob; |
a306f2dd | 390 | |
391 | cp = *cpp; | |
392 | ||
6aacefa7 | 393 | switch (ret->type) { |
fa08c86b | 394 | case KEY_RSA1: |
a306f2dd | 395 | /* Get number of bits. */ |
396 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 397 | return -1; /* Bad bit count... */ |
a306f2dd | 398 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
399 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 400 | if (bits == 0) |
fa08c86b | 401 | return -1; |
a306f2dd | 402 | *cpp = cp; |
4fe2af09 | 403 | /* Get public exponent, public modulus. */ |
404 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 405 | return -1; |
4fe2af09 | 406 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 407 | return -1; |
408 | success = 1; | |
4fe2af09 | 409 | break; |
fa08c86b | 410 | case KEY_UNSPEC: |
411 | case KEY_RSA: | |
4fe2af09 | 412 | case KEY_DSA: |
fa08c86b | 413 | space = strchr(cp, ' '); |
414 | if (space == NULL) { | |
79cfe67c | 415 | debug3("key_read: missing whitespace"); |
fa08c86b | 416 | return -1; |
417 | } | |
418 | *space = '\0'; | |
419 | type = key_type_from_name(cp); | |
420 | *space = ' '; | |
421 | if (type == KEY_UNSPEC) { | |
79cfe67c | 422 | debug3("key_read: missing keytype"); |
fa08c86b | 423 | return -1; |
424 | } | |
425 | cp = space+1; | |
426 | if (*cp == '\0') { | |
427 | debug3("key_read: short string"); | |
428 | return -1; | |
429 | } | |
430 | if (ret->type == KEY_UNSPEC) { | |
431 | ret->type = type; | |
432 | } else if (ret->type != type) { | |
433 | /* is a key, but different type */ | |
434 | debug3("key_read: type mismatch"); | |
cb8c7bad | 435 | return -1; |
fa08c86b | 436 | } |
a306f2dd | 437 | len = 2*strlen(cp); |
438 | blob = xmalloc(len); | |
439 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 440 | if (n < 0) { |
71276795 | 441 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 442 | xfree(blob); |
fa08c86b | 443 | return -1; |
1d1ffb87 | 444 | } |
a27002e5 | 445 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 446 | xfree(blob); |
71276795 | 447 | if (k == NULL) { |
fa08c86b | 448 | error("key_read: key_from_blob %s failed", cp); |
449 | return -1; | |
71276795 | 450 | } |
fa08c86b | 451 | if (k->type != type) { |
452 | error("key_read: type mismatch: encoding error"); | |
453 | key_free(k); | |
454 | return -1; | |
455 | } | |
456 | /*XXXX*/ | |
457 | if (ret->type == KEY_RSA) { | |
458 | if (ret->rsa != NULL) | |
459 | RSA_free(ret->rsa); | |
460 | ret->rsa = k->rsa; | |
461 | k->rsa = NULL; | |
462 | success = 1; | |
463 | #ifdef DEBUG_PK | |
464 | RSA_print_fp(stderr, ret->rsa, 8); | |
465 | #endif | |
466 | } else { | |
467 | if (ret->dsa != NULL) | |
468 | DSA_free(ret->dsa); | |
469 | ret->dsa = k->dsa; | |
470 | k->dsa = NULL; | |
471 | success = 1; | |
472 | #ifdef DEBUG_PK | |
473 | DSA_print_fp(stderr, ret->dsa, 8); | |
474 | #endif | |
475 | } | |
476 | /*XXXX*/ | |
2f98d223 | 477 | key_free(k); |
fa08c86b | 478 | if (success != 1) |
479 | break; | |
71276795 | 480 | /* advance cp: skip whitespace and data */ |
481 | while (*cp == ' ' || *cp == '\t') | |
482 | cp++; | |
483 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
484 | cp++; | |
485 | *cpp = cp; | |
4fe2af09 | 486 | break; |
487 | default: | |
a306f2dd | 488 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 489 | break; |
490 | } | |
fa08c86b | 491 | return success; |
4fe2af09 | 492 | } |
3ddc795d | 493 | |
4fe2af09 | 494 | int |
b6c7b7b7 | 495 | key_write(const Key *key, FILE *f) |
4fe2af09 | 496 | { |
c66f9d0e | 497 | int n, success = 0; |
498 | u_int len, bits = 0; | |
661e45a0 | 499 | u_char *blob; |
500 | char *uu; | |
4fe2af09 | 501 | |
fa08c86b | 502 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 503 | /* size of modulus 'n' */ |
504 | bits = BN_num_bits(key->rsa->n); | |
505 | fprintf(f, "%u", bits); | |
506 | if (write_bignum(f, key->rsa->e) && | |
507 | write_bignum(f, key->rsa->n)) { | |
508 | success = 1; | |
509 | } else { | |
510 | error("key_write: failed for RSA key"); | |
511 | } | |
fa08c86b | 512 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
513 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 514 | key_to_blob(key, &blob, &len); |
a306f2dd | 515 | uu = xmalloc(2*len); |
1d1ffb87 | 516 | n = uuencode(blob, len, uu, 2*len); |
517 | if (n > 0) { | |
fa08c86b | 518 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 519 | success = 1; |
520 | } | |
a306f2dd | 521 | xfree(blob); |
522 | xfree(uu); | |
4fe2af09 | 523 | } |
524 | return success; | |
525 | } | |
3ddc795d | 526 | |
b6c7b7b7 | 527 | const char * |
528 | key_type(const Key *k) | |
1d1ffb87 | 529 | { |
530 | switch (k->type) { | |
fa08c86b | 531 | case KEY_RSA1: |
532 | return "RSA1"; | |
1d1ffb87 | 533 | case KEY_RSA: |
534 | return "RSA"; | |
1d1ffb87 | 535 | case KEY_DSA: |
536 | return "DSA"; | |
1d1ffb87 | 537 | } |
538 | return "unknown"; | |
539 | } | |
3ddc795d | 540 | |
b6c7b7b7 | 541 | const char * |
542 | key_ssh_name(const Key *k) | |
fa08c86b | 543 | { |
544 | switch (k->type) { | |
545 | case KEY_RSA: | |
546 | return "ssh-rsa"; | |
fa08c86b | 547 | case KEY_DSA: |
548 | return "ssh-dss"; | |
fa08c86b | 549 | } |
550 | return "ssh-unknown"; | |
551 | } | |
3ddc795d | 552 | |
fa08c86b | 553 | u_int |
b6c7b7b7 | 554 | key_size(const Key *k) |
6aacefa7 | 555 | { |
2e73a022 | 556 | switch (k->type) { |
fa08c86b | 557 | case KEY_RSA1: |
2e73a022 | 558 | case KEY_RSA: |
559 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 560 | case KEY_DSA: |
561 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 562 | } |
563 | return 0; | |
564 | } | |
fa08c86b | 565 | |
396c147e | 566 | static RSA * |
1e3b8b07 | 567 | rsa_generate_private_key(u_int bits) |
fa08c86b | 568 | { |
2b87da3b | 569 | RSA *private; |
5ef36928 | 570 | |
2b87da3b | 571 | private = RSA_generate_key(bits, 35, NULL, NULL); |
572 | if (private == NULL) | |
573 | fatal("rsa_generate_private_key: key generation failed."); | |
574 | return private; | |
fa08c86b | 575 | } |
576 | ||
396c147e | 577 | static DSA* |
1e3b8b07 | 578 | dsa_generate_private_key(u_int bits) |
fa08c86b | 579 | { |
580 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 581 | |
fa08c86b | 582 | if (private == NULL) |
583 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
584 | if (!DSA_generate_key(private)) | |
2b87da3b | 585 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
586 | if (private == NULL) | |
587 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 588 | return private; |
589 | } | |
590 | ||
591 | Key * | |
1e3b8b07 | 592 | key_generate(int type, u_int bits) |
fa08c86b | 593 | { |
594 | Key *k = key_new(KEY_UNSPEC); | |
595 | switch (type) { | |
2b87da3b | 596 | case KEY_DSA: |
fa08c86b | 597 | k->dsa = dsa_generate_private_key(bits); |
598 | break; | |
599 | case KEY_RSA: | |
600 | case KEY_RSA1: | |
601 | k->rsa = rsa_generate_private_key(bits); | |
602 | break; | |
603 | default: | |
2b87da3b | 604 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 605 | } |
2b87da3b | 606 | k->type = type; |
fa08c86b | 607 | return k; |
608 | } | |
609 | ||
610 | Key * | |
b6c7b7b7 | 611 | key_from_private(const Key *k) |
fa08c86b | 612 | { |
613 | Key *n = NULL; | |
614 | switch (k->type) { | |
2b87da3b | 615 | case KEY_DSA: |
fa08c86b | 616 | n = key_new(k->type); |
617 | BN_copy(n->dsa->p, k->dsa->p); | |
618 | BN_copy(n->dsa->q, k->dsa->q); | |
619 | BN_copy(n->dsa->g, k->dsa->g); | |
620 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
621 | break; | |
622 | case KEY_RSA: | |
623 | case KEY_RSA1: | |
624 | n = key_new(k->type); | |
625 | BN_copy(n->rsa->n, k->rsa->n); | |
626 | BN_copy(n->rsa->e, k->rsa->e); | |
627 | break; | |
628 | default: | |
2b87da3b | 629 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 630 | break; |
631 | } | |
632 | return n; | |
633 | } | |
634 | ||
635 | int | |
636 | key_type_from_name(char *name) | |
637 | { | |
6aacefa7 | 638 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 639 | return KEY_RSA1; |
6aacefa7 | 640 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 641 | return KEY_RSA; |
6aacefa7 | 642 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 643 | return KEY_DSA; |
6aacefa7 | 644 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 645 | return KEY_RSA; |
6aacefa7 | 646 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 647 | return KEY_DSA; |
648 | } | |
539af7f5 | 649 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 650 | return KEY_UNSPEC; |
651 | } | |
652 | ||
e961a8f9 | 653 | int |
654 | key_names_valid2(const char *names) | |
655 | { | |
656 | char *s, *cp, *p; | |
657 | ||
658 | if (names == NULL || strcmp(names, "") == 0) | |
659 | return 0; | |
660 | s = cp = xstrdup(names); | |
661 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 662 | (p = strsep(&cp, ","))) { |
e961a8f9 | 663 | switch (key_type_from_name(p)) { |
664 | case KEY_RSA1: | |
665 | case KEY_UNSPEC: | |
666 | xfree(s); | |
667 | return 0; | |
668 | } | |
669 | } | |
670 | debug3("key names ok: [%s]", names); | |
671 | xfree(s); | |
672 | return 1; | |
673 | } | |
674 | ||
fa08c86b | 675 | Key * |
b6c7b7b7 | 676 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 677 | { |
678 | Buffer b; | |
fa08c86b | 679 | int rlen, type; |
63488674 | 680 | char *ktype = NULL; |
fa08c86b | 681 | Key *key = NULL; |
682 | ||
683 | #ifdef DEBUG_PK | |
684 | dump_base64(stderr, blob, blen); | |
685 | #endif | |
686 | buffer_init(&b); | |
687 | buffer_append(&b, blob, blen); | |
63488674 | 688 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
689 | error("key_from_blob: can't read key type"); | |
690 | goto out; | |
691 | } | |
692 | ||
fa08c86b | 693 | type = key_type_from_name(ktype); |
694 | ||
6aacefa7 | 695 | switch (type) { |
fa08c86b | 696 | case KEY_RSA: |
697 | key = key_new(type); | |
63488674 | 698 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
699 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
700 | error("key_from_blob: can't read rsa key"); | |
701 | key_free(key); | |
702 | key = NULL; | |
703 | goto out; | |
704 | } | |
fa08c86b | 705 | #ifdef DEBUG_PK |
706 | RSA_print_fp(stderr, key->rsa, 8); | |
707 | #endif | |
708 | break; | |
709 | case KEY_DSA: | |
710 | key = key_new(type); | |
63488674 | 711 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
712 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
713 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
714 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
715 | error("key_from_blob: can't read dsa key"); | |
716 | key_free(key); | |
717 | key = NULL; | |
718 | goto out; | |
719 | } | |
fa08c86b | 720 | #ifdef DEBUG_PK |
721 | DSA_print_fp(stderr, key->dsa, 8); | |
722 | #endif | |
723 | break; | |
724 | case KEY_UNSPEC: | |
725 | key = key_new(type); | |
726 | break; | |
727 | default: | |
728 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 729 | goto out; |
fa08c86b | 730 | } |
731 | rlen = buffer_len(&b); | |
732 | if (key != NULL && rlen != 0) | |
733 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 734 | out: |
735 | if (ktype != NULL) | |
736 | xfree(ktype); | |
fa08c86b | 737 | buffer_free(&b); |
738 | return key; | |
739 | } | |
740 | ||
741 | int | |
b6c7b7b7 | 742 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 743 | { |
744 | Buffer b; | |
745 | int len; | |
fa08c86b | 746 | |
747 | if (key == NULL) { | |
748 | error("key_to_blob: key == NULL"); | |
749 | return 0; | |
750 | } | |
751 | buffer_init(&b); | |
6aacefa7 | 752 | switch (key->type) { |
fa08c86b | 753 | case KEY_DSA: |
754 | buffer_put_cstring(&b, key_ssh_name(key)); | |
755 | buffer_put_bignum2(&b, key->dsa->p); | |
756 | buffer_put_bignum2(&b, key->dsa->q); | |
757 | buffer_put_bignum2(&b, key->dsa->g); | |
758 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
759 | break; | |
760 | case KEY_RSA: | |
761 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 762 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 763 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 764 | break; |
765 | default: | |
f7436b8c | 766 | error("key_to_blob: unsupported key type %d", key->type); |
767 | buffer_free(&b); | |
768 | return 0; | |
fa08c86b | 769 | } |
770 | len = buffer_len(&b); | |
fa08c86b | 771 | if (lenp != NULL) |
772 | *lenp = len; | |
eb9f2fab | 773 | if (blobp != NULL) { |
774 | *blobp = xmalloc(len); | |
775 | memcpy(*blobp, buffer_ptr(&b), len); | |
776 | } | |
777 | memset(buffer_ptr(&b), 0, len); | |
778 | buffer_free(&b); | |
fa08c86b | 779 | return len; |
780 | } | |
781 | ||
782 | int | |
783 | key_sign( | |
b6c7b7b7 | 784 | const Key *key, |
c66f9d0e | 785 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 786 | const u_char *data, u_int datalen) |
fa08c86b | 787 | { |
6aacefa7 | 788 | switch (key->type) { |
fa08c86b | 789 | case KEY_DSA: |
790 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 791 | case KEY_RSA: |
792 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 793 | default: |
d77347cc | 794 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 795 | return -1; |
fa08c86b | 796 | } |
797 | } | |
798 | ||
3ed81c99 | 799 | /* |
800 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
801 | * and -1 on error. | |
802 | */ | |
fa08c86b | 803 | int |
804 | key_verify( | |
b6c7b7b7 | 805 | const Key *key, |
806 | const u_char *signature, u_int signaturelen, | |
807 | const u_char *data, u_int datalen) | |
fa08c86b | 808 | { |
c10d042a | 809 | if (signaturelen == 0) |
810 | return -1; | |
811 | ||
6aacefa7 | 812 | switch (key->type) { |
fa08c86b | 813 | case KEY_DSA: |
814 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 815 | case KEY_RSA: |
816 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 817 | default: |
d77347cc | 818 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 819 | return -1; |
fa08c86b | 820 | } |
821 | } | |
d0074658 | 822 | |
823 | /* Converts a private to a public key */ | |
d0074658 | 824 | Key * |
b6c7b7b7 | 825 | key_demote(const Key *k) |
d0074658 | 826 | { |
827 | Key *pk; | |
762715ce | 828 | |
52e3daed | 829 | pk = xcalloc(1, sizeof(*pk)); |
d0074658 | 830 | pk->type = k->type; |
831 | pk->flags = k->flags; | |
832 | pk->dsa = NULL; | |
833 | pk->rsa = NULL; | |
834 | ||
835 | switch (k->type) { | |
836 | case KEY_RSA1: | |
837 | case KEY_RSA: | |
838 | if ((pk->rsa = RSA_new()) == NULL) | |
839 | fatal("key_demote: RSA_new failed"); | |
840 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
841 | fatal("key_demote: BN_dup failed"); | |
842 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
843 | fatal("key_demote: BN_dup failed"); | |
844 | break; | |
845 | case KEY_DSA: | |
846 | if ((pk->dsa = DSA_new()) == NULL) | |
847 | fatal("key_demote: DSA_new failed"); | |
848 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
849 | fatal("key_demote: BN_dup failed"); | |
850 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
851 | fatal("key_demote: BN_dup failed"); | |
852 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
853 | fatal("key_demote: BN_dup failed"); | |
854 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
855 | fatal("key_demote: BN_dup failed"); | |
856 | break; | |
857 | default: | |
858 | fatal("key_free: bad key type %d", k->type); | |
859 | break; | |
860 | } | |
861 | ||
862 | return (pk); | |
863 | } |