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f97fb6ca | 1 | /* $OpenBSD: key.c,v 1.76 2008/06/12 22:03:36 grunk 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. |
f97fb6ca | 14 | * Copyright (c) 2008 Alexander von Gernler. All rights reserved. |
4fe2af09 | 15 | * |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
4fe2af09 | 24 | * |
25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
31652869 | 36 | |
4fe2af09 | 37 | #include "includes.h" |
42f11eb2 | 38 | |
aff73c5f | 39 | #include <sys/param.h> |
31652869 | 40 | #include <sys/types.h> |
41 | ||
4fe2af09 | 42 | #include <openssl/evp.h> |
6e013118 | 43 | #include <openbsd-compat/openssl-compat.h> |
42f11eb2 | 44 | |
24436b92 | 45 | #include <stdarg.h> |
cf851879 | 46 | #include <stdio.h> |
00146caa | 47 | #include <string.h> |
48 | ||
4fe2af09 | 49 | #include "xmalloc.h" |
50 | #include "key.h" | |
fa08c86b | 51 | #include "rsa.h" |
a306f2dd | 52 | #include "uuencode.h" |
fa08c86b | 53 | #include "buffer.h" |
42f11eb2 | 54 | #include "log.h" |
4fe2af09 | 55 | |
56 | Key * | |
57 | key_new(int type) | |
58 | { | |
59 | Key *k; | |
60 | RSA *rsa; | |
61 | DSA *dsa; | |
52e3daed | 62 | k = xcalloc(1, sizeof(*k)); |
4fe2af09 | 63 | k->type = type; |
a306f2dd | 64 | k->dsa = NULL; |
65 | k->rsa = NULL; | |
4fe2af09 | 66 | switch (k->type) { |
fa08c86b | 67 | case KEY_RSA1: |
4fe2af09 | 68 | case KEY_RSA: |
b775c6f2 | 69 | if ((rsa = RSA_new()) == NULL) |
70 | fatal("key_new: RSA_new failed"); | |
71 | if ((rsa->n = BN_new()) == NULL) | |
72 | fatal("key_new: BN_new failed"); | |
73 | if ((rsa->e = BN_new()) == NULL) | |
74 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 75 | k->rsa = rsa; |
76 | break; | |
77 | case KEY_DSA: | |
b775c6f2 | 78 | if ((dsa = DSA_new()) == NULL) |
79 | fatal("key_new: DSA_new failed"); | |
80 | if ((dsa->p = BN_new()) == NULL) | |
81 | fatal("key_new: BN_new failed"); | |
82 | if ((dsa->q = BN_new()) == NULL) | |
83 | fatal("key_new: BN_new failed"); | |
84 | if ((dsa->g = BN_new()) == NULL) | |
85 | fatal("key_new: BN_new failed"); | |
86 | if ((dsa->pub_key = BN_new()) == NULL) | |
87 | fatal("key_new: BN_new failed"); | |
4fe2af09 | 88 | k->dsa = dsa; |
89 | break; | |
fa08c86b | 90 | case KEY_UNSPEC: |
4fe2af09 | 91 | break; |
92 | default: | |
93 | fatal("key_new: bad key type %d", k->type); | |
94 | break; | |
95 | } | |
96 | return k; | |
97 | } | |
3ddc795d | 98 | |
fa08c86b | 99 | Key * |
100 | key_new_private(int type) | |
101 | { | |
102 | Key *k = key_new(type); | |
103 | switch (k->type) { | |
104 | case KEY_RSA1: | |
105 | case KEY_RSA: | |
b775c6f2 | 106 | if ((k->rsa->d = BN_new()) == NULL) |
107 | fatal("key_new_private: BN_new failed"); | |
108 | if ((k->rsa->iqmp = BN_new()) == NULL) | |
109 | fatal("key_new_private: BN_new failed"); | |
110 | if ((k->rsa->q = BN_new()) == NULL) | |
111 | fatal("key_new_private: BN_new failed"); | |
112 | if ((k->rsa->p = BN_new()) == NULL) | |
113 | fatal("key_new_private: BN_new failed"); | |
114 | if ((k->rsa->dmq1 = BN_new()) == NULL) | |
115 | fatal("key_new_private: BN_new failed"); | |
116 | if ((k->rsa->dmp1 = BN_new()) == NULL) | |
117 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 118 | break; |
119 | case KEY_DSA: | |
b775c6f2 | 120 | if ((k->dsa->priv_key = BN_new()) == NULL) |
121 | fatal("key_new_private: BN_new failed"); | |
fa08c86b | 122 | break; |
123 | case KEY_UNSPEC: | |
124 | break; | |
125 | default: | |
126 | break; | |
127 | } | |
128 | return k; | |
129 | } | |
3ddc795d | 130 | |
4fe2af09 | 131 | void |
132 | key_free(Key *k) | |
133 | { | |
7016f7cf | 134 | if (k == NULL) |
353d48db | 135 | fatal("key_free: key is NULL"); |
4fe2af09 | 136 | switch (k->type) { |
fa08c86b | 137 | case KEY_RSA1: |
4fe2af09 | 138 | case KEY_RSA: |
139 | if (k->rsa != NULL) | |
140 | RSA_free(k->rsa); | |
141 | k->rsa = NULL; | |
142 | break; | |
143 | case KEY_DSA: | |
144 | if (k->dsa != NULL) | |
145 | DSA_free(k->dsa); | |
146 | k->dsa = NULL; | |
147 | break; | |
fa08c86b | 148 | case KEY_UNSPEC: |
149 | break; | |
4fe2af09 | 150 | default: |
151 | fatal("key_free: bad key type %d", k->type); | |
152 | break; | |
153 | } | |
154 | xfree(k); | |
155 | } | |
b6c7b7b7 | 156 | |
4fe2af09 | 157 | int |
b6c7b7b7 | 158 | key_equal(const Key *a, const Key *b) |
4fe2af09 | 159 | { |
160 | if (a == NULL || b == NULL || a->type != b->type) | |
161 | return 0; | |
162 | switch (a->type) { | |
fa08c86b | 163 | case KEY_RSA1: |
4fe2af09 | 164 | case KEY_RSA: |
165 | return a->rsa != NULL && b->rsa != NULL && | |
166 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
167 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
4fe2af09 | 168 | case KEY_DSA: |
169 | return a->dsa != NULL && b->dsa != NULL && | |
170 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
171 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
172 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
173 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
4fe2af09 | 174 | default: |
a306f2dd | 175 | fatal("key_equal: bad key type %d", a->type); |
4fe2af09 | 176 | } |
4fe2af09 | 177 | } |
178 | ||
21289cd0 | 179 | u_char* |
b6c7b7b7 | 180 | key_fingerprint_raw(const Key *k, enum fp_type dgst_type, |
181 | u_int *dgst_raw_length) | |
4fe2af09 | 182 | { |
714954dc | 183 | const EVP_MD *md = NULL; |
79c9ac1b | 184 | EVP_MD_CTX ctx; |
1e3b8b07 | 185 | u_char *blob = NULL; |
301e8e5b | 186 | u_char *retval = NULL; |
c66f9d0e | 187 | u_int len = 0; |
a306f2dd | 188 | int nlen, elen; |
4fe2af09 | 189 | |
301e8e5b | 190 | *dgst_raw_length = 0; |
191 | ||
79c9ac1b | 192 | switch (dgst_type) { |
193 | case SSH_FP_MD5: | |
194 | md = EVP_md5(); | |
195 | break; | |
196 | case SSH_FP_SHA1: | |
197 | md = EVP_sha1(); | |
198 | break; | |
199 | default: | |
200 | fatal("key_fingerprint_raw: bad digest type %d", | |
201 | dgst_type); | |
202 | } | |
4fe2af09 | 203 | switch (k->type) { |
fa08c86b | 204 | case KEY_RSA1: |
4fe2af09 | 205 | nlen = BN_num_bytes(k->rsa->n); |
206 | elen = BN_num_bytes(k->rsa->e); | |
207 | len = nlen + elen; | |
a306f2dd | 208 | blob = xmalloc(len); |
209 | BN_bn2bin(k->rsa->n, blob); | |
210 | BN_bn2bin(k->rsa->e, blob + nlen); | |
4fe2af09 | 211 | break; |
212 | case KEY_DSA: | |
fa08c86b | 213 | case KEY_RSA: |
214 | key_to_blob(k, &blob, &len); | |
215 | break; | |
216 | case KEY_UNSPEC: | |
217 | return retval; | |
4fe2af09 | 218 | default: |
301e8e5b | 219 | fatal("key_fingerprint_raw: bad key type %d", k->type); |
4fe2af09 | 220 | break; |
221 | } | |
a306f2dd | 222 | if (blob != NULL) { |
301e8e5b | 223 | retval = xmalloc(EVP_MAX_MD_SIZE); |
74fc9186 | 224 | EVP_DigestInit(&ctx, md); |
225 | EVP_DigestUpdate(&ctx, blob, len); | |
a209a158 | 226 | EVP_DigestFinal(&ctx, retval, dgst_raw_length); |
a306f2dd | 227 | memset(blob, 0, len); |
228 | xfree(blob); | |
301e8e5b | 229 | } else { |
230 | fatal("key_fingerprint_raw: blob is null"); | |
4fe2af09 | 231 | } |
232 | return retval; | |
233 | } | |
234 | ||
343288b8 | 235 | static char * |
236 | key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 237 | { |
238 | char *retval; | |
2ceb8101 | 239 | u_int i; |
301e8e5b | 240 | |
52e3daed | 241 | retval = xcalloc(1, dgst_raw_len * 3 + 1); |
184eed6a | 242 | for (i = 0; i < dgst_raw_len; i++) { |
301e8e5b | 243 | char hex[4]; |
244 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
956b0f56 | 245 | strlcat(retval, hex, dgst_raw_len * 3 + 1); |
301e8e5b | 246 | } |
956b0f56 | 247 | |
248 | /* Remove the trailing ':' character */ | |
301e8e5b | 249 | retval[(dgst_raw_len * 3) - 1] = '\0'; |
250 | return retval; | |
251 | } | |
252 | ||
343288b8 | 253 | static char * |
254 | key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len) | |
301e8e5b | 255 | { |
256 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
257 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
258 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
08345971 | 259 | u_int i, j = 0, rounds, seed = 1; |
301e8e5b | 260 | char *retval; |
261 | ||
262 | rounds = (dgst_raw_len / 2) + 1; | |
52e3daed | 263 | retval = xcalloc((rounds * 6), sizeof(char)); |
08345971 | 264 | retval[j++] = 'x'; |
265 | for (i = 0; i < rounds; i++) { | |
301e8e5b | 266 | u_int idx0, idx1, idx2, idx3, idx4; |
08345971 | 267 | if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) { |
268 | idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + | |
301e8e5b | 269 | seed) % 6; |
08345971 | 270 | idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15; |
271 | idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + | |
301e8e5b | 272 | (seed / 6)) % 6; |
08345971 | 273 | retval[j++] = vowels[idx0]; |
274 | retval[j++] = consonants[idx1]; | |
275 | retval[j++] = vowels[idx2]; | |
276 | if ((i + 1) < rounds) { | |
277 | idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15; | |
278 | idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15; | |
279 | retval[j++] = consonants[idx3]; | |
280 | retval[j++] = '-'; | |
281 | retval[j++] = consonants[idx4]; | |
301e8e5b | 282 | seed = ((seed * 5) + |
08345971 | 283 | ((((u_int)(dgst_raw[2 * i])) * 7) + |
284 | ((u_int)(dgst_raw[(2 * i) + 1])))) % 36; | |
301e8e5b | 285 | } |
286 | } else { | |
287 | idx0 = seed % 6; | |
288 | idx1 = 16; | |
289 | idx2 = seed / 6; | |
08345971 | 290 | retval[j++] = vowels[idx0]; |
291 | retval[j++] = consonants[idx1]; | |
292 | retval[j++] = vowels[idx2]; | |
301e8e5b | 293 | } |
294 | } | |
08345971 | 295 | retval[j++] = 'x'; |
296 | retval[j++] = '\0'; | |
301e8e5b | 297 | return retval; |
298 | } | |
299 | ||
aff73c5f | 300 | /* |
301 | * Draw an ASCII-Art representing the fingerprint so human brain can | |
302 | * profit from its built-in pattern recognition ability. | |
303 | * This technique is called "random art" and can be found in some | |
304 | * scientific publications like this original paper: | |
305 | * | |
306 | * "Hash Visualization: a New Technique to improve Real-World Security", | |
307 | * Perrig A. and Song D., 1999, International Workshop on Cryptographic | |
308 | * Techniques and E-Commerce (CrypTEC '99) | |
309 | * sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf | |
310 | * | |
311 | * The subject came up in a talk by Dan Kaminsky, too. | |
312 | * | |
313 | * If you see the picture is different, the key is different. | |
314 | * If the picture looks the same, you still know nothing. | |
315 | * | |
316 | * The algorithm used here is a worm crawling over a discrete plane, | |
317 | * leaving a trace (augmenting the field) everywhere it goes. | |
318 | * Movement is taken from dgst_raw 2bit-wise. Bumping into walls | |
319 | * makes the respective movement vector be ignored for this turn. | |
320 | * Graphs are not unambiguous, because circles in graphs can be | |
321 | * walked in either direction. | |
322 | */ | |
79c0e3e6 | 323 | |
324 | /* | |
325 | * Field sizes for the random art. Have to be odd, so the starting point | |
326 | * can be in the exact middle of the picture, and FLDBASE should be >=8 . | |
327 | * Else pictures would be too dense, and drawing the frame would | |
328 | * fail, too, because the key type would not fit in anymore. | |
329 | */ | |
330 | #define FLDBASE 8 | |
331 | #define FLDSIZE_Y (FLDBASE + 1) | |
332 | #define FLDSIZE_X (FLDBASE * 2 + 1) | |
aff73c5f | 333 | static char * |
79c0e3e6 | 334 | key_fingerprint_randomart(u_char *dgst_raw, u_int dgst_raw_len, const Key *k) |
aff73c5f | 335 | { |
336 | /* | |
337 | * Chars to be used after each other every time the worm | |
338 | * intersects with itself. Matter of taste. | |
339 | */ | |
2bb50d23 | 340 | char *augmentation_string = " .o+=*BOX@%&#/^SE"; |
aff73c5f | 341 | char *retval, *p; |
e3115002 | 342 | u_char field[FLDSIZE_X][FLDSIZE_Y]; |
aff73c5f | 343 | u_int i, b; |
344 | int x, y; | |
97841001 | 345 | size_t len = strlen(augmentation_string) - 1; |
aff73c5f | 346 | |
347 | retval = xcalloc(1, (FLDSIZE_X + 3) * (FLDSIZE_Y + 2)); | |
348 | ||
349 | /* initialize field */ | |
e3115002 | 350 | memset(field, 0, FLDSIZE_X * FLDSIZE_Y * sizeof(char)); |
aff73c5f | 351 | x = FLDSIZE_X / 2; |
352 | y = FLDSIZE_Y / 2; | |
aff73c5f | 353 | |
354 | /* process raw key */ | |
355 | for (i = 0; i < dgst_raw_len; i++) { | |
356 | int input; | |
357 | /* each byte conveys four 2-bit move commands */ | |
358 | input = dgst_raw[i]; | |
359 | for (b = 0; b < 4; b++) { | |
360 | /* evaluate 2 bit, rest is shifted later */ | |
361 | x += (input & 0x1) ? 1 : -1; | |
362 | y += (input & 0x2) ? 1 : -1; | |
363 | ||
364 | /* assure we are still in bounds */ | |
365 | x = MAX(x, 0); | |
366 | y = MAX(y, 0); | |
367 | x = MIN(x, FLDSIZE_X - 1); | |
368 | y = MIN(y, FLDSIZE_Y - 1); | |
369 | ||
370 | /* augment the field */ | |
e3115002 | 371 | field[x][y]++; |
aff73c5f | 372 | input = input >> 2; |
373 | } | |
374 | } | |
2bb50d23 | 375 | |
376 | /* mark starting point and end point*/ | |
377 | field[FLDSIZE_X / 2][FLDSIZE_Y / 2] = len - 1; | |
378 | field[x][y] = len; | |
aff73c5f | 379 | |
380 | /* fill in retval */ | |
79c0e3e6 | 381 | snprintf(retval, 10, "+--[%4s]", key_type(k)); |
382 | p = strchr(retval, '\0'); | |
aff73c5f | 383 | |
384 | /* output upper border */ | |
79c0e3e6 | 385 | for (i = 0; i < FLDSIZE_X - 8; i++) |
aff73c5f | 386 | *p++ = '-'; |
387 | *p++ = '+'; | |
388 | *p++ = '\n'; | |
389 | ||
390 | /* output content */ | |
391 | for (y = 0; y < FLDSIZE_Y; y++) { | |
392 | *p++ = '|'; | |
393 | for (x = 0; x < FLDSIZE_X; x++) | |
97841001 | 394 | *p++ = augmentation_string[MIN(field[x][y], len)]; |
aff73c5f | 395 | *p++ = '|'; |
396 | *p++ = '\n'; | |
397 | } | |
398 | ||
399 | /* output lower border */ | |
400 | *p++ = '+'; | |
401 | for (i = 0; i < FLDSIZE_X; i++) | |
402 | *p++ = '-'; | |
403 | *p++ = '+'; | |
404 | ||
405 | return retval; | |
406 | } | |
407 | ||
343288b8 | 408 | char * |
b6c7b7b7 | 409 | key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) |
301e8e5b | 410 | { |
cd332296 | 411 | char *retval = NULL; |
301e8e5b | 412 | u_char *dgst_raw; |
a209a158 | 413 | u_int dgst_raw_len; |
184eed6a | 414 | |
301e8e5b | 415 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); |
416 | if (!dgst_raw) | |
22138a36 | 417 | fatal("key_fingerprint: null from key_fingerprint_raw()"); |
6aacefa7 | 418 | switch (dgst_rep) { |
301e8e5b | 419 | case SSH_FP_HEX: |
420 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
421 | break; | |
422 | case SSH_FP_BUBBLEBABBLE: | |
423 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
424 | break; | |
aff73c5f | 425 | case SSH_FP_RANDOMART: |
79c0e3e6 | 426 | retval = key_fingerprint_randomart(dgst_raw, dgst_raw_len, k); |
aff73c5f | 427 | break; |
301e8e5b | 428 | default: |
429 | fatal("key_fingerprint_ex: bad digest representation %d", | |
430 | dgst_rep); | |
431 | break; | |
432 | } | |
433 | memset(dgst_raw, 0, dgst_raw_len); | |
434 | xfree(dgst_raw); | |
435 | return retval; | |
436 | } | |
437 | ||
4fe2af09 | 438 | /* |
439 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
440 | * the pointer. The integer must already be initialized. This function is | |
441 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
442 | * last processed (and maybe modified) character. Note that this may modify | |
443 | * the buffer containing the number. | |
444 | */ | |
396c147e | 445 | static int |
4fe2af09 | 446 | read_bignum(char **cpp, BIGNUM * value) |
447 | { | |
448 | char *cp = *cpp; | |
449 | int old; | |
450 | ||
451 | /* Skip any leading whitespace. */ | |
452 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
453 | ; | |
454 | ||
455 | /* Check that it begins with a decimal digit. */ | |
456 | if (*cp < '0' || *cp > '9') | |
457 | return 0; | |
458 | ||
459 | /* Save starting position. */ | |
460 | *cpp = cp; | |
461 | ||
462 | /* Move forward until all decimal digits skipped. */ | |
463 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
464 | ; | |
465 | ||
466 | /* Save the old terminating character, and replace it by \0. */ | |
467 | old = *cp; | |
468 | *cp = 0; | |
469 | ||
470 | /* Parse the number. */ | |
471 | if (BN_dec2bn(&value, *cpp) == 0) | |
472 | return 0; | |
473 | ||
474 | /* Restore old terminating character. */ | |
475 | *cp = old; | |
476 | ||
477 | /* Move beyond the number and return success. */ | |
478 | *cpp = cp; | |
479 | return 1; | |
480 | } | |
3ddc795d | 481 | |
396c147e | 482 | static int |
4fe2af09 | 483 | write_bignum(FILE *f, BIGNUM *num) |
484 | { | |
485 | char *buf = BN_bn2dec(num); | |
486 | if (buf == NULL) { | |
487 | error("write_bignum: BN_bn2dec() failed"); | |
488 | return 0; | |
489 | } | |
490 | fprintf(f, " %s", buf); | |
c48c32c1 | 491 | OPENSSL_free(buf); |
4fe2af09 | 492 | return 1; |
493 | } | |
fa08c86b | 494 | |
cb8c7bad | 495 | /* returns 1 ok, -1 error */ |
fa08c86b | 496 | int |
a306f2dd | 497 | key_read(Key *ret, char **cpp) |
4fe2af09 | 498 | { |
a306f2dd | 499 | Key *k; |
fa08c86b | 500 | int success = -1; |
501 | char *cp, *space; | |
502 | int len, n, type; | |
503 | u_int bits; | |
1e3b8b07 | 504 | u_char *blob; |
a306f2dd | 505 | |
506 | cp = *cpp; | |
507 | ||
6aacefa7 | 508 | switch (ret->type) { |
fa08c86b | 509 | case KEY_RSA1: |
a306f2dd | 510 | /* Get number of bits. */ |
511 | if (*cp < '0' || *cp > '9') | |
fa08c86b | 512 | return -1; /* Bad bit count... */ |
a306f2dd | 513 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) |
514 | bits = 10 * bits + *cp - '0'; | |
4fe2af09 | 515 | if (bits == 0) |
fa08c86b | 516 | return -1; |
a306f2dd | 517 | *cpp = cp; |
4fe2af09 | 518 | /* Get public exponent, public modulus. */ |
519 | if (!read_bignum(cpp, ret->rsa->e)) | |
fa08c86b | 520 | return -1; |
4fe2af09 | 521 | if (!read_bignum(cpp, ret->rsa->n)) |
fa08c86b | 522 | return -1; |
523 | success = 1; | |
4fe2af09 | 524 | break; |
fa08c86b | 525 | case KEY_UNSPEC: |
526 | case KEY_RSA: | |
4fe2af09 | 527 | case KEY_DSA: |
fa08c86b | 528 | space = strchr(cp, ' '); |
529 | if (space == NULL) { | |
79cfe67c | 530 | debug3("key_read: missing whitespace"); |
fa08c86b | 531 | return -1; |
532 | } | |
533 | *space = '\0'; | |
534 | type = key_type_from_name(cp); | |
535 | *space = ' '; | |
536 | if (type == KEY_UNSPEC) { | |
79cfe67c | 537 | debug3("key_read: missing keytype"); |
fa08c86b | 538 | return -1; |
539 | } | |
540 | cp = space+1; | |
541 | if (*cp == '\0') { | |
542 | debug3("key_read: short string"); | |
543 | return -1; | |
544 | } | |
545 | if (ret->type == KEY_UNSPEC) { | |
546 | ret->type = type; | |
547 | } else if (ret->type != type) { | |
548 | /* is a key, but different type */ | |
549 | debug3("key_read: type mismatch"); | |
cb8c7bad | 550 | return -1; |
fa08c86b | 551 | } |
a306f2dd | 552 | len = 2*strlen(cp); |
553 | blob = xmalloc(len); | |
554 | n = uudecode(cp, blob, len); | |
1d1ffb87 | 555 | if (n < 0) { |
71276795 | 556 | error("key_read: uudecode %s failed", cp); |
2f98d223 | 557 | xfree(blob); |
fa08c86b | 558 | return -1; |
1d1ffb87 | 559 | } |
a27002e5 | 560 | k = key_from_blob(blob, (u_int)n); |
2f98d223 | 561 | xfree(blob); |
71276795 | 562 | if (k == NULL) { |
fa08c86b | 563 | error("key_read: key_from_blob %s failed", cp); |
564 | return -1; | |
71276795 | 565 | } |
fa08c86b | 566 | if (k->type != type) { |
567 | error("key_read: type mismatch: encoding error"); | |
568 | key_free(k); | |
569 | return -1; | |
570 | } | |
571 | /*XXXX*/ | |
572 | if (ret->type == KEY_RSA) { | |
573 | if (ret->rsa != NULL) | |
574 | RSA_free(ret->rsa); | |
575 | ret->rsa = k->rsa; | |
576 | k->rsa = NULL; | |
577 | success = 1; | |
578 | #ifdef DEBUG_PK | |
579 | RSA_print_fp(stderr, ret->rsa, 8); | |
580 | #endif | |
581 | } else { | |
582 | if (ret->dsa != NULL) | |
583 | DSA_free(ret->dsa); | |
584 | ret->dsa = k->dsa; | |
585 | k->dsa = NULL; | |
586 | success = 1; | |
587 | #ifdef DEBUG_PK | |
588 | DSA_print_fp(stderr, ret->dsa, 8); | |
589 | #endif | |
590 | } | |
591 | /*XXXX*/ | |
2f98d223 | 592 | key_free(k); |
fa08c86b | 593 | if (success != 1) |
594 | break; | |
71276795 | 595 | /* advance cp: skip whitespace and data */ |
596 | while (*cp == ' ' || *cp == '\t') | |
597 | cp++; | |
598 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
599 | cp++; | |
600 | *cpp = cp; | |
4fe2af09 | 601 | break; |
602 | default: | |
a306f2dd | 603 | fatal("key_read: bad key type: %d", ret->type); |
4fe2af09 | 604 | break; |
605 | } | |
fa08c86b | 606 | return success; |
4fe2af09 | 607 | } |
3ddc795d | 608 | |
4fe2af09 | 609 | int |
b6c7b7b7 | 610 | key_write(const Key *key, FILE *f) |
4fe2af09 | 611 | { |
c66f9d0e | 612 | int n, success = 0; |
613 | u_int len, bits = 0; | |
661e45a0 | 614 | u_char *blob; |
615 | char *uu; | |
4fe2af09 | 616 | |
fa08c86b | 617 | if (key->type == KEY_RSA1 && key->rsa != NULL) { |
4fe2af09 | 618 | /* size of modulus 'n' */ |
619 | bits = BN_num_bits(key->rsa->n); | |
620 | fprintf(f, "%u", bits); | |
621 | if (write_bignum(f, key->rsa->e) && | |
622 | write_bignum(f, key->rsa->n)) { | |
623 | success = 1; | |
624 | } else { | |
625 | error("key_write: failed for RSA key"); | |
626 | } | |
fa08c86b | 627 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || |
628 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
fa08c86b | 629 | key_to_blob(key, &blob, &len); |
a306f2dd | 630 | uu = xmalloc(2*len); |
1d1ffb87 | 631 | n = uuencode(blob, len, uu, 2*len); |
632 | if (n > 0) { | |
fa08c86b | 633 | fprintf(f, "%s %s", key_ssh_name(key), uu); |
1d1ffb87 | 634 | success = 1; |
635 | } | |
a306f2dd | 636 | xfree(blob); |
637 | xfree(uu); | |
4fe2af09 | 638 | } |
639 | return success; | |
640 | } | |
3ddc795d | 641 | |
b6c7b7b7 | 642 | const char * |
643 | key_type(const Key *k) | |
1d1ffb87 | 644 | { |
645 | switch (k->type) { | |
fa08c86b | 646 | case KEY_RSA1: |
647 | return "RSA1"; | |
1d1ffb87 | 648 | case KEY_RSA: |
649 | return "RSA"; | |
1d1ffb87 | 650 | case KEY_DSA: |
651 | return "DSA"; | |
1d1ffb87 | 652 | } |
653 | return "unknown"; | |
654 | } | |
3ddc795d | 655 | |
b6c7b7b7 | 656 | const char * |
657 | key_ssh_name(const Key *k) | |
fa08c86b | 658 | { |
659 | switch (k->type) { | |
660 | case KEY_RSA: | |
661 | return "ssh-rsa"; | |
fa08c86b | 662 | case KEY_DSA: |
663 | return "ssh-dss"; | |
fa08c86b | 664 | } |
665 | return "ssh-unknown"; | |
666 | } | |
3ddc795d | 667 | |
fa08c86b | 668 | u_int |
b6c7b7b7 | 669 | key_size(const Key *k) |
6aacefa7 | 670 | { |
2e73a022 | 671 | switch (k->type) { |
fa08c86b | 672 | case KEY_RSA1: |
2e73a022 | 673 | case KEY_RSA: |
674 | return BN_num_bits(k->rsa->n); | |
2e73a022 | 675 | case KEY_DSA: |
676 | return BN_num_bits(k->dsa->p); | |
2e73a022 | 677 | } |
678 | return 0; | |
679 | } | |
fa08c86b | 680 | |
396c147e | 681 | static RSA * |
1e3b8b07 | 682 | rsa_generate_private_key(u_int bits) |
fa08c86b | 683 | { |
2b87da3b | 684 | RSA *private; |
5ef36928 | 685 | |
2b87da3b | 686 | private = RSA_generate_key(bits, 35, NULL, NULL); |
687 | if (private == NULL) | |
688 | fatal("rsa_generate_private_key: key generation failed."); | |
689 | return private; | |
fa08c86b | 690 | } |
691 | ||
396c147e | 692 | static DSA* |
1e3b8b07 | 693 | dsa_generate_private_key(u_int bits) |
fa08c86b | 694 | { |
695 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
5ef36928 | 696 | |
fa08c86b | 697 | if (private == NULL) |
698 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
699 | if (!DSA_generate_key(private)) | |
2b87da3b | 700 | fatal("dsa_generate_private_key: DSA_generate_key failed."); |
701 | if (private == NULL) | |
702 | fatal("dsa_generate_private_key: NULL."); | |
fa08c86b | 703 | return private; |
704 | } | |
705 | ||
706 | Key * | |
1e3b8b07 | 707 | key_generate(int type, u_int bits) |
fa08c86b | 708 | { |
709 | Key *k = key_new(KEY_UNSPEC); | |
710 | switch (type) { | |
2b87da3b | 711 | case KEY_DSA: |
fa08c86b | 712 | k->dsa = dsa_generate_private_key(bits); |
713 | break; | |
714 | case KEY_RSA: | |
715 | case KEY_RSA1: | |
716 | k->rsa = rsa_generate_private_key(bits); | |
717 | break; | |
718 | default: | |
2b87da3b | 719 | fatal("key_generate: unknown type %d", type); |
fa08c86b | 720 | } |
2b87da3b | 721 | k->type = type; |
fa08c86b | 722 | return k; |
723 | } | |
724 | ||
725 | Key * | |
b6c7b7b7 | 726 | key_from_private(const Key *k) |
fa08c86b | 727 | { |
728 | Key *n = NULL; | |
729 | switch (k->type) { | |
2b87da3b | 730 | case KEY_DSA: |
fa08c86b | 731 | n = key_new(k->type); |
e516451d | 732 | if ((BN_copy(n->dsa->p, k->dsa->p) == NULL) || |
733 | (BN_copy(n->dsa->q, k->dsa->q) == NULL) || | |
734 | (BN_copy(n->dsa->g, k->dsa->g) == NULL) || | |
735 | (BN_copy(n->dsa->pub_key, k->dsa->pub_key) == NULL)) | |
736 | fatal("key_from_private: BN_copy failed"); | |
fa08c86b | 737 | break; |
738 | case KEY_RSA: | |
739 | case KEY_RSA1: | |
740 | n = key_new(k->type); | |
e516451d | 741 | if ((BN_copy(n->rsa->n, k->rsa->n) == NULL) || |
742 | (BN_copy(n->rsa->e, k->rsa->e) == NULL)) | |
743 | fatal("key_from_private: BN_copy failed"); | |
fa08c86b | 744 | break; |
745 | default: | |
2b87da3b | 746 | fatal("key_from_private: unknown type %d", k->type); |
fa08c86b | 747 | break; |
748 | } | |
749 | return n; | |
750 | } | |
751 | ||
752 | int | |
753 | key_type_from_name(char *name) | |
754 | { | |
6aacefa7 | 755 | if (strcmp(name, "rsa1") == 0) { |
fa08c86b | 756 | return KEY_RSA1; |
6aacefa7 | 757 | } else if (strcmp(name, "rsa") == 0) { |
fa08c86b | 758 | return KEY_RSA; |
6aacefa7 | 759 | } else if (strcmp(name, "dsa") == 0) { |
fa08c86b | 760 | return KEY_DSA; |
6aacefa7 | 761 | } else if (strcmp(name, "ssh-rsa") == 0) { |
fa08c86b | 762 | return KEY_RSA; |
6aacefa7 | 763 | } else if (strcmp(name, "ssh-dss") == 0) { |
fa08c86b | 764 | return KEY_DSA; |
765 | } | |
539af7f5 | 766 | debug2("key_type_from_name: unknown key type '%s'", name); |
fa08c86b | 767 | return KEY_UNSPEC; |
768 | } | |
769 | ||
e961a8f9 | 770 | int |
771 | key_names_valid2(const char *names) | |
772 | { | |
773 | char *s, *cp, *p; | |
774 | ||
775 | if (names == NULL || strcmp(names, "") == 0) | |
776 | return 0; | |
777 | s = cp = xstrdup(names); | |
778 | for ((p = strsep(&cp, ",")); p && *p != '\0'; | |
184eed6a | 779 | (p = strsep(&cp, ","))) { |
e961a8f9 | 780 | switch (key_type_from_name(p)) { |
781 | case KEY_RSA1: | |
782 | case KEY_UNSPEC: | |
783 | xfree(s); | |
784 | return 0; | |
785 | } | |
786 | } | |
787 | debug3("key names ok: [%s]", names); | |
788 | xfree(s); | |
789 | return 1; | |
790 | } | |
791 | ||
fa08c86b | 792 | Key * |
b6c7b7b7 | 793 | key_from_blob(const u_char *blob, u_int blen) |
fa08c86b | 794 | { |
795 | Buffer b; | |
fa08c86b | 796 | int rlen, type; |
63488674 | 797 | char *ktype = NULL; |
fa08c86b | 798 | Key *key = NULL; |
799 | ||
800 | #ifdef DEBUG_PK | |
801 | dump_base64(stderr, blob, blen); | |
802 | #endif | |
803 | buffer_init(&b); | |
804 | buffer_append(&b, blob, blen); | |
63488674 | 805 | if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) { |
806 | error("key_from_blob: can't read key type"); | |
807 | goto out; | |
808 | } | |
809 | ||
fa08c86b | 810 | type = key_type_from_name(ktype); |
811 | ||
6aacefa7 | 812 | switch (type) { |
fa08c86b | 813 | case KEY_RSA: |
814 | key = key_new(type); | |
63488674 | 815 | if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 || |
816 | buffer_get_bignum2_ret(&b, key->rsa->n) == -1) { | |
817 | error("key_from_blob: can't read rsa key"); | |
818 | key_free(key); | |
819 | key = NULL; | |
820 | goto out; | |
821 | } | |
fa08c86b | 822 | #ifdef DEBUG_PK |
823 | RSA_print_fp(stderr, key->rsa, 8); | |
824 | #endif | |
825 | break; | |
826 | case KEY_DSA: | |
827 | key = key_new(type); | |
63488674 | 828 | if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 || |
829 | buffer_get_bignum2_ret(&b, key->dsa->q) == -1 || | |
830 | buffer_get_bignum2_ret(&b, key->dsa->g) == -1 || | |
831 | buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) { | |
832 | error("key_from_blob: can't read dsa key"); | |
833 | key_free(key); | |
834 | key = NULL; | |
835 | goto out; | |
836 | } | |
fa08c86b | 837 | #ifdef DEBUG_PK |
838 | DSA_print_fp(stderr, key->dsa, 8); | |
839 | #endif | |
840 | break; | |
841 | case KEY_UNSPEC: | |
842 | key = key_new(type); | |
843 | break; | |
844 | default: | |
845 | error("key_from_blob: cannot handle type %s", ktype); | |
63488674 | 846 | goto out; |
fa08c86b | 847 | } |
848 | rlen = buffer_len(&b); | |
849 | if (key != NULL && rlen != 0) | |
850 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
63488674 | 851 | out: |
852 | if (ktype != NULL) | |
853 | xfree(ktype); | |
fa08c86b | 854 | buffer_free(&b); |
855 | return key; | |
856 | } | |
857 | ||
858 | int | |
b6c7b7b7 | 859 | key_to_blob(const Key *key, u_char **blobp, u_int *lenp) |
fa08c86b | 860 | { |
861 | Buffer b; | |
862 | int len; | |
fa08c86b | 863 | |
864 | if (key == NULL) { | |
865 | error("key_to_blob: key == NULL"); | |
866 | return 0; | |
867 | } | |
868 | buffer_init(&b); | |
6aacefa7 | 869 | switch (key->type) { |
fa08c86b | 870 | case KEY_DSA: |
871 | buffer_put_cstring(&b, key_ssh_name(key)); | |
872 | buffer_put_bignum2(&b, key->dsa->p); | |
873 | buffer_put_bignum2(&b, key->dsa->q); | |
874 | buffer_put_bignum2(&b, key->dsa->g); | |
875 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
876 | break; | |
877 | case KEY_RSA: | |
878 | buffer_put_cstring(&b, key_ssh_name(key)); | |
fa08c86b | 879 | buffer_put_bignum2(&b, key->rsa->e); |
b5c334cc | 880 | buffer_put_bignum2(&b, key->rsa->n); |
fa08c86b | 881 | break; |
882 | default: | |
f7436b8c | 883 | error("key_to_blob: unsupported key type %d", key->type); |
884 | buffer_free(&b); | |
885 | return 0; | |
fa08c86b | 886 | } |
887 | len = buffer_len(&b); | |
fa08c86b | 888 | if (lenp != NULL) |
889 | *lenp = len; | |
eb9f2fab | 890 | if (blobp != NULL) { |
891 | *blobp = xmalloc(len); | |
892 | memcpy(*blobp, buffer_ptr(&b), len); | |
893 | } | |
894 | memset(buffer_ptr(&b), 0, len); | |
895 | buffer_free(&b); | |
fa08c86b | 896 | return len; |
897 | } | |
898 | ||
899 | int | |
900 | key_sign( | |
b6c7b7b7 | 901 | const Key *key, |
c66f9d0e | 902 | u_char **sigp, u_int *lenp, |
b6c7b7b7 | 903 | const u_char *data, u_int datalen) |
fa08c86b | 904 | { |
6aacefa7 | 905 | switch (key->type) { |
fa08c86b | 906 | case KEY_DSA: |
907 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 908 | case KEY_RSA: |
909 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
fa08c86b | 910 | default: |
d77347cc | 911 | error("key_sign: invalid key type %d", key->type); |
fa08c86b | 912 | return -1; |
fa08c86b | 913 | } |
914 | } | |
915 | ||
3ed81c99 | 916 | /* |
917 | * key_verify returns 1 for a correct signature, 0 for an incorrect signature | |
918 | * and -1 on error. | |
919 | */ | |
fa08c86b | 920 | int |
921 | key_verify( | |
b6c7b7b7 | 922 | const Key *key, |
923 | const u_char *signature, u_int signaturelen, | |
924 | const u_char *data, u_int datalen) | |
fa08c86b | 925 | { |
c10d042a | 926 | if (signaturelen == 0) |
927 | return -1; | |
928 | ||
6aacefa7 | 929 | switch (key->type) { |
fa08c86b | 930 | case KEY_DSA: |
931 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 932 | case KEY_RSA: |
933 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
fa08c86b | 934 | default: |
d77347cc | 935 | error("key_verify: invalid key type %d", key->type); |
fa08c86b | 936 | return -1; |
fa08c86b | 937 | } |
938 | } | |
d0074658 | 939 | |
940 | /* Converts a private to a public key */ | |
d0074658 | 941 | Key * |
b6c7b7b7 | 942 | key_demote(const Key *k) |
d0074658 | 943 | { |
944 | Key *pk; | |
762715ce | 945 | |
52e3daed | 946 | pk = xcalloc(1, sizeof(*pk)); |
d0074658 | 947 | pk->type = k->type; |
948 | pk->flags = k->flags; | |
949 | pk->dsa = NULL; | |
950 | pk->rsa = NULL; | |
951 | ||
952 | switch (k->type) { | |
953 | case KEY_RSA1: | |
954 | case KEY_RSA: | |
955 | if ((pk->rsa = RSA_new()) == NULL) | |
956 | fatal("key_demote: RSA_new failed"); | |
957 | if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL) | |
958 | fatal("key_demote: BN_dup failed"); | |
959 | if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL) | |
960 | fatal("key_demote: BN_dup failed"); | |
961 | break; | |
962 | case KEY_DSA: | |
963 | if ((pk->dsa = DSA_new()) == NULL) | |
964 | fatal("key_demote: DSA_new failed"); | |
965 | if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL) | |
966 | fatal("key_demote: BN_dup failed"); | |
967 | if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL) | |
968 | fatal("key_demote: BN_dup failed"); | |
969 | if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL) | |
970 | fatal("key_demote: BN_dup failed"); | |
971 | if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL) | |
972 | fatal("key_demote: BN_dup failed"); | |
973 | break; | |
974 | default: | |
975 | fatal("key_free: bad key type %d", k->type); | |
976 | break; | |
977 | } | |
978 | ||
979 | return (pk); | |
980 | } |