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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; | |
4fe2af09 | 159 | case KEY_DSA: |
160 | return a->dsa != NULL && b->dsa != NULL && | |
161 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
162 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
163 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
164 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
4fe2af09 | 165 | default: |
a306f2dd | 166 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 167 | break; |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
21289cd0 | 172 | u_char* |
b6c7b7b7 | 173 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
174 | u_int *dgst_raw_length) | |
4fe2af09 | 175 | { |
714954dc | 176 | const EVP_MD *md = NULL; |
79c9ac1b | 177 | EVP_MD_CTX ctx; |
1e3b8b07 | 178 | u_char *blob = NULL; |
301e8e5b | 179 | u_char *retval = NULL; |
c66f9d0e | 180 | u_int len = 0; |
a306f2dd | 181 | int nlen, elen; |
4fe2af09 | 182 | |
301e8e5b | 183 | *dgst_raw_length = 0; |
184 | ||
79c9ac1b | 185 | switch (dgst_type) { |
186 | case SSH_FP_MD5: | |
187 | md = EVP_md5(); | |
188 | break; | |
189 | case SSH_FP_SHA1: | |
190 | md = EVP_sha1(); | |
191 | break; | |
192 | default: | |
193 | fatal("key_fingerprint_raw: bad digest type %d", | |
194 | dgst_type); | |
195 | } | |
4fe2af09 | 196 | switch (k->type) { |
fa08c86b | 197 | case KEY_RSA1: |
4fe2af09 | 198 | nlen = BN_num_bytes(k->rsa->n); |
199 | elen = BN_num_bytes(k->rsa->e); | |
200 | len = nlen + elen; | |
a306f2dd | 201 | blob = xmalloc(len); |
202 | BN_bn2bin(k->rsa->n, blob); | |
203 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 204 | break; |
205 | case KEY_DSA: | |
fa08c86b | 206 | case KEY_RSA: |
207 | key_to_blob(k, &blob, &len); | |
208 | break; | |
209 | case KEY_UNSPEC: | |
210 | return retval; | |
4fe2af09 | 211 | default: |
301e8e5b | 212 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 213 | break; |
214 | } | |
a306f2dd | 215 | if (blob != NULL) { |
301e8e5b | 216 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 217 | EVP_DigestInit(&ctx, md); |
218 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 219 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 220 | memset(blob, 0, len); |
221 | xfree(blob); | |
301e8e5b | 222 | } else { |
223 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 224 | } |
225 | return retval; | |
226 | } | |
227 | ||
343288b8 | 228 | static char * |
229 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 230 | { |
231 | char *retval; | |
2ceb8101 | 232 | u_int i; |
301e8e5b | 233 | |
a88b7b57 | 234 | retval = xmalloc(dgst_raw_len * 3 + 1); |
301e8e5b | 235 | retval[0] = '\0'; |
184eed6a | 236 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 237 | char hex[4]; |
238 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 239 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 240 | } |
956b0f56 | 241 | |
242 | /* Remove the trailing ':' character */ | |
301e8e5b | 243 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
244 | return retval; | |
245 | } | |
246 | ||
343288b8 | 247 | static char * |
248 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 249 | { |
250 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
251 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
252 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 253 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 254 | char *retval; |
255 | ||
256 | rounds = (dgst_raw_len / 2) + 1; | |
257 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
08345971 | 258 | retval[j++] = 'x'; |
259 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 260 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 261 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
262 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 263 | seed) % 6; |
08345971 | 264 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
265 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 266 | (seed / 6)) % 6; |
08345971 | 267 | retval[j++] = vowels[idx0]; |
268 | retval[j++] = consonants[idx1]; | |
269 | retval[j++] = vowels[idx2]; | |
270 | if ((i + 1) < rounds) { | |
271 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
272 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
273 | retval[j++] = consonants[idx3]; | |
274 | retval[j++] = '-'; | |
275 | retval[j++] = consonants[idx4]; | |
301e8e5b | 276 | seed = ((seed * 5) + |
08345971 | 277 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
278 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 279 | } |
280 | } else { | |
281 | idx0 = seed % 6; | |
282 | idx1 = 16; | |
283 | idx2 = seed / 6; | |
08345971 | 284 | retval[j++] = vowels[idx0]; |
285 | retval[j++] = consonants[idx1]; | |
286 | retval[j++] = vowels[idx2]; | |
301e8e5b | 287 | } |
288 | } | |
08345971 | 289 | retval[j++] = 'x'; |
290 | retval[j++] = '\0'; | |
301e8e5b | 291 | return retval; |
292 | } | |
293 | ||
343288b8 | 294 | char * |
b6c7b7b7 | 295 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 296 | { |
cd332296 | 297 | char *retval = NULL; |
301e8e5b | 298 | u_char *dgst_raw; |
a209a158 | 299 | u_int dgst_raw_len; |
184eed6a | 300 | |
301e8e5b | 301 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
302 | if (!dgst_raw) | |
22138a36 | 303 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 304 | switch (dgst_rep) { |
301e8e5b | 305 | case SSH_FP_HEX: |
306 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
307 | break; | |
308 | case SSH_FP_BUBBLEBABBLE: | |
309 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
310 | break; | |
311 | default: | |
312 | fatal("key_fingerprint_ex: bad digest representation %d", | |
313 | dgst_rep); | |
314 | break; | |
315 | } | |
316 | memset(dgst_raw, 0, dgst_raw_len); | |
317 | xfree(dgst_raw); | |
318 | return retval; | |
319 | } | |
320 | ||
4fe2af09 | 321 | /* |
322 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
323 | * the pointer. The integer must already be initialized. This function is | |
324 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
325 | * last processed (and maybe modified) character. Note that this may modify | |
326 | * the buffer containing the number. | |
327 | */ | |
396c147e | 328 | static int |
4fe2af09 | 329 | read_bignum(char **cpp, BIGNUM * value) |
330 | { | |
331 | char *cp = *cpp; | |
332 | int old; | |
333 | ||
334 | /* Skip any leading whitespace. */ | |
335 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
336 | ; | |
337 | ||
338 | /* Check that it begins with a decimal digit. */ | |
339 | if (*cp < '0' || *cp > '9') | |
340 | return 0; | |
341 | ||
342 | /* Save starting position. */ | |
343 | *cpp = cp; | |
344 | ||
345 | /* Move forward until all decimal digits skipped. */ | |
346 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
347 | ; | |
348 | ||
349 | /* Save the old terminating character, and replace it by \0. */ | |
350 | old = *cp; | |
351 | *cp = 0; | |
352 | ||
353 | /* Parse the number. */ | |
354 | if (BN_dec2bn(&value, *cpp) == 0) | |
355 | return 0; | |
356 | ||
357 | /* Restore old terminating character. */ | |
358 | *cp = old; | |
359 | ||
360 | /* Move beyond the number and return success. */ | |
361 | *cpp = cp; | |
362 | return 1; | |
363 | } | |
3ddc795d | 364 | |
396c147e | 365 | static int |
4fe2af09 | 366 | write_bignum(FILE *f, BIGNUM *num) |
367 | { | |
368 | char *buf = BN_bn2dec(num); | |
369 | if (buf == NULL) { | |
370 | error("write_bignum: BN_bn2dec() failed"); | |
371 | return 0; | |
372 | } | |
373 | fprintf(f, " %s", buf); | |
c48c32c1 | 374 | OPENSSL_free(buf); |
4fe2af09 | 375 | return 1; |
376 | } | |
fa08c86b | 377 | |
cb8c7bad | 378 | /* returns 1 ok, -1 error */ |
fa08c86b | 379 | int |
a306f2dd | 380 | key_read(Key *ret, char **cpp) |
4fe2af09 | 381 | { |
a306f2dd | 382 | Key *k; |
fa08c86b | 383 | int success = -1; |
384 | char *cp, *space; | |
385 | int len, n, type; | |
386 | u_int bits; | |
1e3b8b07 | 387 | u_char *blob; |
a306f2dd | 388 | |
389 | cp = *cpp; | |
390 | ||
6aacefa7 | 391 | switch (ret->type) { |
fa08c86b | 392 | case KEY_RSA1: |
a306f2dd | 393 | /* Get number of bits. */ |
394 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 395 | return -1; /* Bad bit count... */ |
a306f2dd | 396 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
397 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 398 | if (bits == 0) |
fa08c86b | 399 | return -1; |
a306f2dd | 400 | *cpp = cp; |
4fe2af09 | 401 | /* Get public exponent, public modulus. */ |
402 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 403 | return -1; |
4fe2af09 | 404 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 405 | return -1; |
406 | success = 1; | |
4fe2af09 | 407 | break; |
fa08c86b | 408 | case KEY_UNSPEC: |
409 | case KEY_RSA: | |
4fe2af09 | 410 | case KEY_DSA: |
fa08c86b | 411 | space = strchr(cp, ' '); |
412 | if (space == NULL) { | |
79cfe67c | 413 | debug3("key_read: missing whitespace"); |
fa08c86b | 414 | return -1; |
415 | } | |
416 | *space = '\0'; | |
417 | type = key_type_from_name(cp); | |
418 | *space = ' '; | |
419 | if (type == KEY_UNSPEC) { | |
79cfe67c | 420 | debug3("key_read: missing keytype"); |
fa08c86b | 421 | return -1; |
422 | } | |
423 | cp = space+1; | |
424 | if (*cp == '\0') { | |
425 | debug3("key_read: short string"); | |
426 | return -1; | |
427 | } | |
428 | if (ret->type == KEY_UNSPEC) { | |
429 | ret->type = type; | |
430 | } else if (ret->type != type) { | |
431 | /* is a key, but different type */ | |
432 | debug3("key_read: type mismatch"); | |
cb8c7bad | 433 | return -1; |
fa08c86b | 434 | } |
a306f2dd | 435 | len = 2*strlen(cp); |
436 | blob = xmalloc(len); | |
437 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 438 | if (n < 0) { |
71276795 | 439 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 440 | xfree(blob); |
fa08c86b | 441 | return -1; |
1d1ffb87 | 442 | } |
a27002e5 | 443 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 444 | xfree(blob); |
71276795 | 445 | if (k == NULL) { |
fa08c86b | 446 | error("key_read: key_from_blob %s failed", cp); |
447 | return -1; | |
71276795 | 448 | } |
fa08c86b | 449 | if (k->type != type) { |
450 | error("key_read: type mismatch: encoding error"); | |
451 | key_free(k); | |
452 | return -1; | |
453 | } | |
454 | /*XXXX*/ | |
455 | if (ret->type == KEY_RSA) { | |
456 | if (ret->rsa != NULL) | |
457 | RSA_free(ret->rsa); | |
458 | ret->rsa = k->rsa; | |
459 | k->rsa = NULL; | |
460 | success = 1; | |
461 | #ifdef DEBUG_PK | |
462 | RSA_print_fp(stderr, ret->rsa, 8); | |
463 | #endif | |
464 | } else { | |
465 | if (ret->dsa != NULL) | |
466 | DSA_free(ret->dsa); | |
467 | ret->dsa = k->dsa; | |
468 | k->dsa = NULL; | |
469 | success = 1; | |
470 | #ifdef DEBUG_PK | |
471 | DSA_print_fp(stderr, ret->dsa, 8); | |
472 | #endif | |
473 | } | |
474 | /*XXXX*/ | |
2f98d223 | 475 | key_free(k); |
fa08c86b | 476 | if (success != 1) |
477 | break; | |
71276795 | 478 | /* advance cp: skip whitespace and data */ |
479 | while (*cp == ' ' || *cp == '\t') | |
480 | cp++; | |
481 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
482 | cp++; | |
483 | *cpp = cp; | |
4fe2af09 | 484 | break; |
485 | default: | |
a306f2dd | 486 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 487 | break; |
488 | } | |
fa08c86b | 489 | return success; |
4fe2af09 | 490 | } |
3ddc795d | 491 | |
4fe2af09 | 492 | int |
b6c7b7b7 | 493 | key_write(const Key *key, FILE *f) |
4fe2af09 | 494 | { |
c66f9d0e | 495 | int n, success = 0; |
496 | u_int len, bits = 0; | |
661e45a0 | 497 | u_char *blob; |
498 | char *uu; | |
4fe2af09 | 499 | |
fa08c86b | 500 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 501 | /* size of modulus 'n' */ |
502 | bits = BN_num_bits(key->rsa->n); | |
503 | fprintf(f, "%u", bits); | |
504 | if (write_bignum(f, key->rsa->e) && | |
505 | write_bignum(f, key->rsa->n)) { | |
506 | success = 1; | |
507 | } else { | |
508 | error("key_write: failed for RSA key"); | |
509 | } | |
fa08c86b | 510 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
511 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 512 | key_to_blob(key, &blob, &len); |
a306f2dd | 513 | uu = xmalloc(2*len); |
1d1ffb87 | 514 | n = uuencode(blob, len, uu, 2*len); |
515 | if (n > 0) { | |
fa08c86b | 516 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 517 | success = 1; |
518 | } | |
a306f2dd | 519 | xfree(blob); |
520 | xfree(uu); | |
4fe2af09 | 521 | } |
522 | return success; | |
523 | } | |
3ddc795d | 524 | |
b6c7b7b7 | 525 | const char * |
526 | key_type(const Key *k) | |
1d1ffb87 | 527 | { |
528 | switch (k->type) { | |
fa08c86b | 529 | case KEY_RSA1: |
530 | return "RSA1"; | |
1d1ffb87 | 531 | case KEY_RSA: |
532 | return "RSA"; | |
1d1ffb87 | 533 | case KEY_DSA: |
534 | return "DSA"; | |
1d1ffb87 | 535 | } |
536 | return "unknown"; | |
537 | } | |
3ddc795d | 538 | |
b6c7b7b7 | 539 | const char * |
540 | key_ssh_name(const Key *k) | |
fa08c86b | 541 | { |
542 | switch (k->type) { | |
543 | case KEY_RSA: | |
544 | return "ssh-rsa"; | |
fa08c86b | 545 | case KEY_DSA: |
546 | return "ssh-dss"; | |
fa08c86b | 547 | } |
548 | return "ssh-unknown"; | |
549 | } | |
3ddc795d | 550 | |
fa08c86b | 551 | u_int |
b6c7b7b7 | 552 | key_size(const Key *k) |
6aacefa7 | 553 | { |
2e73a022 | 554 | switch (k->type) { |
fa08c86b | 555 | case KEY_RSA1: |
2e73a022 | 556 | case KEY_RSA: |
557 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 558 | case KEY_DSA: |
559 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 560 | } |
561 | return 0; | |
562 | } | |
fa08c86b | 563 | |
396c147e | 564 | static RSA * |
1e3b8b07 | 565 | rsa_generate_private_key(u_int bits) |
fa08c86b | 566 | { |
2b87da3b | 567 | RSA *private; |
5ef36928 | 568 | |
2b87da3b | 569 | private = RSA_generate_key(bits, 35, NULL, NULL); |
570 | if (private == NULL) | |
571 | fatal("rsa_generate_private_key: key generation failed."); | |
572 | return private; | |
fa08c86b | 573 | } |
574 | ||
396c147e | 575 | static DSA* |
1e3b8b07 | 576 | dsa_generate_private_key(u_int bits) |
fa08c86b | 577 | { |
578 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 579 | |
fa08c86b | 580 | if (private == NULL) |
581 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
582 | if (!DSA_generate_key(private)) | |
2b87da3b | 583 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
584 | if (private == NULL) | |
585 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 586 | return private; |
587 | } | |
588 | ||
589 | Key * | |
1e3b8b07 | 590 | key_generate(int type, u_int bits) |
fa08c86b | 591 | { |
592 | Key *k = key_new(KEY_UNSPEC); | |
593 | switch (type) { | |
2b87da3b | 594 | case KEY_DSA: |
fa08c86b | 595 | k->dsa = dsa_generate_private_key(bits); |
596 | break; | |
597 | case KEY_RSA: | |
598 | case KEY_RSA1: | |
599 | k->rsa = rsa_generate_private_key(bits); | |
600 | break; | |
601 | default: | |
2b87da3b | 602 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 603 | } |
2b87da3b | 604 | k->type = type; |
fa08c86b | 605 | return k; |
606 | } | |
607 | ||
608 | Key * | |
b6c7b7b7 | 609 | key_from_private(const Key *k) |
fa08c86b | 610 | { |
611 | Key *n = NULL; | |
612 | switch (k->type) { | |
2b87da3b | 613 | case KEY_DSA: |
fa08c86b | 614 | n = key_new(k->type); |
615 | BN_copy(n->dsa->p, k->dsa->p); | |
616 | BN_copy(n->dsa->q, k->dsa->q); | |
617 | BN_copy(n->dsa->g, k->dsa->g); | |
618 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
619 | break; | |
620 | case KEY_RSA: | |
621 | case KEY_RSA1: | |
622 | n = key_new(k->type); | |
623 | BN_copy(n->rsa->n, k->rsa->n); | |
624 | BN_copy(n->rsa->e, k->rsa->e); | |
625 | break; | |
626 | default: | |
2b87da3b | 627 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 628 | break; |
629 | } | |
630 | return n; | |
631 | } | |
632 | ||
633 | int | |
634 | key_type_from_name(char *name) | |
635 | { | |
6aacefa7 | 636 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 637 | return KEY_RSA1; |
6aacefa7 | 638 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 639 | return KEY_RSA; |
6aacefa7 | 640 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 641 | return KEY_DSA; |
6aacefa7 | 642 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 643 | return KEY_RSA; |
6aacefa7 | 644 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 645 | return KEY_DSA; |
646 | } | |
539af7f5 | 647 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 648 | return KEY_UNSPEC; |
649 | } | |
650 | ||
e961a8f9 | 651 | int |
652 | key_names_valid2(const char *names) | |
653 | { | |
654 | char *s, *cp, *p; | |
655 | ||
656 | if (names == NULL || strcmp(names, "") == 0) | |
657 | return 0; | |
658 | s = cp = xstrdup(names); | |
659 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 660 | (p = strsep(&cp, ","))) { |
e961a8f9 | 661 | switch (key_type_from_name(p)) { |
662 | case KEY_RSA1: | |
663 | case KEY_UNSPEC: | |
664 | xfree(s); | |
665 | return 0; | |
666 | } | |
667 | } | |
668 | debug3("key names ok: [%s]", names); | |
669 | xfree(s); | |
670 | return 1; | |
671 | } | |
672 | ||
fa08c86b | 673 | Key * |
b6c7b7b7 | 674 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 675 | { |
676 | Buffer b; | |
fa08c86b | 677 | int rlen, type; |
63488674 | 678 | char *ktype = NULL; |
fa08c86b | 679 | Key *key = NULL; |
680 | ||
681 | #ifdef DEBUG_PK | |
682 | dump_base64(stderr, blob, blen); | |
683 | #endif | |
684 | buffer_init(&b); | |
685 | buffer_append(&b, blob, blen); | |
63488674 | 686 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
687 | error("key_from_blob: can't read key type"); | |
688 | goto out; | |
689 | } | |
690 | ||
fa08c86b | 691 | type = key_type_from_name(ktype); |
692 | ||
6aacefa7 | 693 | switch (type) { |
fa08c86b | 694 | case KEY_RSA: |
695 | key = key_new(type); | |
63488674 | 696 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
697 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
698 | error("key_from_blob: can't read rsa key"); | |
699 | key_free(key); | |
700 | key = NULL; | |
701 | goto out; | |
702 | } | |
fa08c86b | 703 | #ifdef DEBUG_PK |
704 | RSA_print_fp(stderr, key->rsa, 8); | |
705 | #endif | |
706 | break; | |
707 | case KEY_DSA: | |
708 | key = key_new(type); | |
63488674 | 709 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
710 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
711 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
712 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
713 | error("key_from_blob: can't read dsa key"); | |
714 | key_free(key); | |
715 | key = NULL; | |
716 | goto out; | |
717 | } | |
fa08c86b | 718 | #ifdef DEBUG_PK |
719 | DSA_print_fp(stderr, key->dsa, 8); | |
720 | #endif | |
721 | break; | |
722 | case KEY_UNSPEC: | |
723 | key = key_new(type); | |
724 | break; | |
725 | default: | |
726 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 727 | goto out; |
fa08c86b | 728 | } |
729 | rlen = buffer_len(&b); | |
730 | if (key != NULL && rlen != 0) | |
731 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 732 | out: |
733 | if (ktype != NULL) | |
734 | xfree(ktype); | |
fa08c86b | 735 | buffer_free(&b); |
736 | return key; | |
737 | } | |
738 | ||
739 | int | |
b6c7b7b7 | 740 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 741 | { |
742 | Buffer b; | |
743 | int len; | |
fa08c86b | 744 | |
745 | if (key == NULL) { | |
746 | error("key_to_blob: key == NULL"); | |
747 | return 0; | |
748 | } | |
749 | buffer_init(&b); | |
6aacefa7 | 750 | switch (key->type) { |
fa08c86b | 751 | case KEY_DSA: |
752 | buffer_put_cstring(&b, key_ssh_name(key)); | |
753 | buffer_put_bignum2(&b, key->dsa->p); | |
754 | buffer_put_bignum2(&b, key->dsa->q); | |
755 | buffer_put_bignum2(&b, key->dsa->g); | |
756 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
757 | break; | |
758 | case KEY_RSA: | |
759 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 760 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 761 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 762 | break; |
763 | default: | |
f7436b8c | 764 | error("key_to_blob: unsupported key type %d", key->type); |
765 | buffer_free(&b); | |
766 | return 0; | |
fa08c86b | 767 | } |
768 | len = buffer_len(&b); | |
fa08c86b | 769 | if (lenp != NULL) |
770 | *lenp = len; | |
eb9f2fab | 771 | if (blobp != NULL) { |
772 | *blobp = xmalloc(len); | |
773 | memcpy(*blobp, buffer_ptr(&b), len); | |
774 | } | |
775 | memset(buffer_ptr(&b), 0, len); | |
776 | buffer_free(&b); | |
fa08c86b | 777 | return len; |
778 | } | |
779 | ||
780 | int | |
781 | key_sign( | |
b6c7b7b7 | 782 | const Key *key, |
c66f9d0e | 783 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 784 | const u_char *data, u_int datalen) |
fa08c86b | 785 | { |
6aacefa7 | 786 | switch (key->type) { |
fa08c86b | 787 | case KEY_DSA: |
788 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 789 | case KEY_RSA: |
790 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 791 | default: |
d77347cc | 792 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 793 | return -1; |
fa08c86b | 794 | } |
795 | } | |
796 | ||
3ed81c99 | 797 | /* |
798 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
799 | * and -1 on error. | |
800 | */ | |
fa08c86b | 801 | int |
802 | key_verify( | |
b6c7b7b7 | 803 | const Key *key, |
804 | const u_char *signature, u_int signaturelen, | |
805 | const u_char *data, u_int datalen) | |
fa08c86b | 806 | { |
c10d042a | 807 | if (signaturelen == 0) |
808 | return -1; | |
809 | ||
6aacefa7 | 810 | switch (key->type) { |
fa08c86b | 811 | case KEY_DSA: |
812 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 813 | case KEY_RSA: |
814 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 815 | default: |
d77347cc | 816 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 817 | return -1; |
fa08c86b | 818 | } |
819 | } | |
d0074658 | 820 | |
821 | /* Converts a private to a public key */ | |
d0074658 | 822 | Key * |
b6c7b7b7 | 823 | key_demote(const Key *k) |
d0074658 | 824 | { |
825 | Key *pk; | |
762715ce | 826 | |
d0074658 | 827 | pk = xmalloc(sizeof(*pk)); |
828 | pk->type = k->type; | |
829 | pk->flags = k->flags; | |
830 | pk->dsa = NULL; | |
831 | pk->rsa = NULL; | |
832 | ||
833 | switch (k->type) { | |
834 | case KEY_RSA1: | |
835 | case KEY_RSA: | |
836 | if ((pk->rsa = RSA_new()) == NULL) | |
837 | fatal("key_demote: RSA_new failed"); | |
838 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
839 | fatal("key_demote: BN_dup failed"); | |
840 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
841 | fatal("key_demote: BN_dup failed"); | |
842 | break; | |
843 | case KEY_DSA: | |
844 | if ((pk->dsa = DSA_new()) == NULL) | |
845 | fatal("key_demote: DSA_new failed"); | |
846 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
847 | fatal("key_demote: BN_dup failed"); | |
848 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
849 | fatal("key_demote: BN_dup failed"); | |
850 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
851 | fatal("key_demote: BN_dup failed"); | |
852 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
853 | fatal("key_demote: BN_dup failed"); | |
854 | break; | |
855 | default: | |
856 | fatal("key_free: bad key type %d", k->type); | |
857 | break; | |
858 | } | |
859 | ||
860 | return (pk); | |
861 | } |