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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
4 | * All rights reserved | |
5260325f | 5 | * This file contains functions for reading and writing identity files, and |
6 | * for reading the passphrase from the user. | |
6ae2364d | 7 | * |
bcbf86ec | 8 | * As far as I am concerned, the code I have written for this software |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | * | |
14 | * | |
15 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
16 | * | |
17 | * Redistribution and use in source and binary forms, with or without | |
18 | * modification, are permitted provided that the following conditions | |
19 | * are met: | |
20 | * 1. Redistributions of source code must retain the above copyright | |
21 | * notice, this list of conditions and the following disclaimer. | |
22 | * 2. Redistributions in binary form must reproduce the above copyright | |
23 | * notice, this list of conditions and the following disclaimer in the | |
24 | * documentation and/or other materials provided with the distribution. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 36 | */ |
8efc0c15 | 37 | |
38 | #include "includes.h" | |
bcbf86ec | 39 | RCSID("$OpenBSD: authfile.c,v 1.19 2000/09/07 20:27:49 deraadt Exp $"); |
8efc0c15 | 40 | |
41 | #include <openssl/bn.h> | |
a306f2dd | 42 | #include <openssl/dsa.h> |
43 | #include <openssl/rsa.h> | |
44 | #include <openssl/pem.h> | |
45 | #include <openssl/evp.h> | |
46 | ||
8efc0c15 | 47 | #include "xmalloc.h" |
48 | #include "buffer.h" | |
49 | #include "bufaux.h" | |
50 | #include "cipher.h" | |
51 | #include "ssh.h" | |
a306f2dd | 52 | #include "key.h" |
8efc0c15 | 53 | |
54 | /* Version identification string for identity files. */ | |
55 | #define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n" | |
56 | ||
aa3378df | 57 | /* |
58 | * Saves the authentication (private) key in a file, encrypting it with | |
59 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
60 | * precede the key to provide identification of the key without needing a | |
61 | * passphrase. | |
62 | */ | |
8efc0c15 | 63 | |
64 | int | |
a306f2dd | 65 | save_private_key_rsa(const char *filename, const char *passphrase, |
66 | RSA *key, const char *comment) | |
8efc0c15 | 67 | { |
5260325f | 68 | Buffer buffer, encrypted; |
69 | char buf[100], *cp; | |
a408af76 | 70 | int fd, i; |
5260325f | 71 | CipherContext cipher; |
72 | int cipher_type; | |
73 | u_int32_t rand; | |
74 | ||
aa3378df | 75 | /* |
76 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
77 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
78 | */ | |
5260325f | 79 | if (strcmp(passphrase, "") == 0) |
80 | cipher_type = SSH_CIPHER_NONE; | |
81 | else | |
82 | cipher_type = SSH_AUTHFILE_CIPHER; | |
83 | ||
84 | /* This buffer is used to built the secret part of the private key. */ | |
85 | buffer_init(&buffer); | |
86 | ||
87 | /* Put checkbytes for checking passphrase validity. */ | |
88 | rand = arc4random(); | |
89 | buf[0] = rand & 0xff; | |
90 | buf[1] = (rand >> 8) & 0xff; | |
91 | buf[2] = buf[0]; | |
92 | buf[3] = buf[1]; | |
93 | buffer_append(&buffer, buf, 4); | |
94 | ||
aa3378df | 95 | /* |
96 | * Store the private key (n and e will not be stored because they | |
97 | * will be stored in plain text, and storing them also in encrypted | |
98 | * format would just give known plaintext). | |
99 | */ | |
5260325f | 100 | buffer_put_bignum(&buffer, key->d); |
101 | buffer_put_bignum(&buffer, key->iqmp); | |
102 | buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */ | |
103 | buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */ | |
104 | ||
105 | /* Pad the part to be encrypted until its size is a multiple of 8. */ | |
106 | while (buffer_len(&buffer) % 8 != 0) | |
107 | buffer_put_char(&buffer, 0); | |
108 | ||
109 | /* This buffer will be used to contain the data in the file. */ | |
110 | buffer_init(&encrypted); | |
111 | ||
112 | /* First store keyfile id string. */ | |
113 | cp = AUTHFILE_ID_STRING; | |
114 | for (i = 0; cp[i]; i++) | |
115 | buffer_put_char(&encrypted, cp[i]); | |
116 | buffer_put_char(&encrypted, 0); | |
117 | ||
118 | /* Store cipher type. */ | |
119 | buffer_put_char(&encrypted, cipher_type); | |
120 | buffer_put_int(&encrypted, 0); /* For future extension */ | |
121 | ||
122 | /* Store public key. This will be in plain text. */ | |
123 | buffer_put_int(&encrypted, BN_num_bits(key->n)); | |
124 | buffer_put_bignum(&encrypted, key->n); | |
125 | buffer_put_bignum(&encrypted, key->e); | |
126 | buffer_put_string(&encrypted, comment, strlen(comment)); | |
127 | ||
128 | /* Allocate space for the private part of the key in the buffer. */ | |
129 | buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); | |
130 | ||
8ce64345 | 131 | cipher_set_key_string(&cipher, cipher_type, passphrase); |
5260325f | 132 | cipher_encrypt(&cipher, (unsigned char *) cp, |
133 | (unsigned char *) buffer_ptr(&buffer), | |
134 | buffer_len(&buffer)); | |
135 | memset(&cipher, 0, sizeof(cipher)); | |
136 | ||
137 | /* Destroy temporary data. */ | |
138 | memset(buf, 0, sizeof(buf)); | |
139 | buffer_free(&buffer); | |
140 | ||
a408af76 | 141 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
142 | if (fd < 0) | |
5260325f | 143 | return 0; |
a408af76 | 144 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
5260325f | 145 | buffer_len(&encrypted)) { |
146 | debug("Write to key file %.200s failed: %.100s", filename, | |
147 | strerror(errno)); | |
148 | buffer_free(&encrypted); | |
a408af76 | 149 | close(fd); |
5260325f | 150 | remove(filename); |
151 | return 0; | |
152 | } | |
a408af76 | 153 | close(fd); |
5260325f | 154 | buffer_free(&encrypted); |
155 | return 1; | |
8efc0c15 | 156 | } |
157 | ||
a306f2dd | 158 | /* save DSA key in OpenSSL PEM format */ |
159 | ||
160 | int | |
161 | save_private_key_dsa(const char *filename, const char *passphrase, | |
162 | DSA *dsa, const char *comment) | |
163 | { | |
164 | FILE *fp; | |
165 | int fd; | |
166 | int success = 1; | |
167 | int len = strlen(passphrase); | |
168 | ||
169 | if (len > 0 && len <= 4) { | |
170 | error("passphrase too short: %d bytes", len); | |
171 | errno = 0; | |
172 | return 0; | |
173 | } | |
174 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
175 | if (fd < 0) { | |
176 | debug("open %s failed", filename); | |
177 | return 0; | |
178 | } | |
179 | fp = fdopen(fd, "w"); | |
180 | if (fp == NULL ) { | |
181 | debug("fdopen %s failed", filename); | |
182 | close(fd); | |
183 | return 0; | |
184 | } | |
185 | if (len > 0) { | |
186 | if (!PEM_write_DSAPrivateKey(fp, dsa, EVP_des_ede3_cbc(), | |
187 | (char *)passphrase, strlen(passphrase), NULL, NULL)) | |
188 | success = 0; | |
189 | } else { | |
190 | if (!PEM_write_DSAPrivateKey(fp, dsa, NULL, | |
191 | NULL, 0, NULL, NULL)) | |
192 | success = 0; | |
193 | } | |
194 | fclose(fp); | |
195 | return success; | |
196 | } | |
197 | ||
198 | int | |
199 | save_private_key(const char *filename, const char *passphrase, Key *key, | |
200 | const char *comment) | |
201 | { | |
202 | switch (key->type) { | |
203 | case KEY_RSA: | |
204 | return save_private_key_rsa(filename, passphrase, key->rsa, comment); | |
205 | break; | |
206 | case KEY_DSA: | |
207 | return save_private_key_dsa(filename, passphrase, key->dsa, comment); | |
208 | break; | |
209 | default: | |
210 | break; | |
211 | } | |
212 | return 0; | |
213 | } | |
214 | ||
aa3378df | 215 | /* |
216 | * Loads the public part of the key file. Returns 0 if an error was | |
217 | * encountered (the file does not exist or is not readable), and non-zero | |
218 | * otherwise. | |
219 | */ | |
8efc0c15 | 220 | |
221 | int | |
a306f2dd | 222 | load_public_key_rsa(const char *filename, RSA * pub, char **comment_return) |
8efc0c15 | 223 | { |
a408af76 | 224 | int fd, i; |
5260325f | 225 | off_t len; |
226 | Buffer buffer; | |
227 | char *cp; | |
228 | ||
a408af76 | 229 | fd = open(filename, O_RDONLY); |
230 | if (fd < 0) | |
5260325f | 231 | return 0; |
a408af76 | 232 | len = lseek(fd, (off_t) 0, SEEK_END); |
233 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 234 | |
235 | buffer_init(&buffer); | |
236 | buffer_append_space(&buffer, &cp, len); | |
237 | ||
a408af76 | 238 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 239 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 240 | strerror(errno)); |
5260325f | 241 | buffer_free(&buffer); |
a408af76 | 242 | close(fd); |
5260325f | 243 | return 0; |
244 | } | |
a408af76 | 245 | close(fd); |
5260325f | 246 | |
247 | /* Check that it is at least big enought to contain the ID string. */ | |
248 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { | |
249 | debug("Bad key file %.200s.", filename); | |
250 | buffer_free(&buffer); | |
251 | return 0; | |
252 | } | |
aa3378df | 253 | /* |
254 | * Make sure it begins with the id string. Consume the id string | |
255 | * from the buffer. | |
256 | */ | |
5260325f | 257 | for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
a408af76 | 258 | if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { |
5260325f | 259 | debug("Bad key file %.200s.", filename); |
260 | buffer_free(&buffer); | |
261 | return 0; | |
262 | } | |
263 | /* Skip cipher type and reserved data. */ | |
264 | (void) buffer_get_char(&buffer); /* cipher type */ | |
265 | (void) buffer_get_int(&buffer); /* reserved */ | |
266 | ||
267 | /* Read the public key from the buffer. */ | |
268 | buffer_get_int(&buffer); | |
a306f2dd | 269 | /* XXX alloc */ |
270 | if (pub->n == NULL) | |
271 | pub->n = BN_new(); | |
5260325f | 272 | buffer_get_bignum(&buffer, pub->n); |
a306f2dd | 273 | /* XXX alloc */ |
274 | if (pub->e == NULL) | |
275 | pub->e = BN_new(); | |
5260325f | 276 | buffer_get_bignum(&buffer, pub->e); |
277 | if (comment_return) | |
278 | *comment_return = buffer_get_string(&buffer, NULL); | |
279 | /* The encrypted private part is not parsed by this function. */ | |
280 | ||
8efc0c15 | 281 | buffer_free(&buffer); |
5260325f | 282 | |
283 | return 1; | |
8efc0c15 | 284 | } |
285 | ||
bcbf86ec | 286 | /* load public key from private-key file */ |
a306f2dd | 287 | int |
288 | load_public_key(const char *filename, Key * key, char **comment_return) | |
289 | { | |
290 | switch (key->type) { | |
291 | case KEY_RSA: | |
292 | return load_public_key_rsa(filename, key->rsa, comment_return); | |
293 | break; | |
294 | case KEY_DSA: | |
295 | default: | |
296 | break; | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
aa3378df | 301 | /* |
302 | * Loads the private key from the file. Returns 0 if an error is encountered | |
303 | * (file does not exist or is not readable, or passphrase is bad). This | |
304 | * initializes the private key. | |
305 | * Assumes we are called under uid of the owner of the file. | |
306 | */ | |
8efc0c15 | 307 | |
308 | int | |
a306f2dd | 309 | load_private_key_rsa(int fd, const char *filename, |
310 | const char *passphrase, RSA * prv, char **comment_return) | |
8efc0c15 | 311 | { |
a306f2dd | 312 | int i, check1, check2, cipher_type; |
5260325f | 313 | off_t len; |
314 | Buffer buffer, decrypted; | |
315 | char *cp; | |
316 | CipherContext cipher; | |
317 | BN_CTX *ctx; | |
318 | BIGNUM *aux; | |
5260325f | 319 | |
a408af76 | 320 | len = lseek(fd, (off_t) 0, SEEK_END); |
321 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 322 | |
323 | buffer_init(&buffer); | |
324 | buffer_append_space(&buffer, &cp, len); | |
325 | ||
a408af76 | 326 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 327 | debug("Read from key file %.200s failed: %.100s", filename, |
328 | strerror(errno)); | |
329 | buffer_free(&buffer); | |
a408af76 | 330 | close(fd); |
5260325f | 331 | return 0; |
332 | } | |
a408af76 | 333 | close(fd); |
5260325f | 334 | |
335 | /* Check that it is at least big enought to contain the ID string. */ | |
336 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { | |
337 | debug("Bad key file %.200s.", filename); | |
338 | buffer_free(&buffer); | |
339 | return 0; | |
340 | } | |
aa3378df | 341 | /* |
342 | * Make sure it begins with the id string. Consume the id string | |
343 | * from the buffer. | |
344 | */ | |
5260325f | 345 | for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
346 | if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) { | |
347 | debug("Bad key file %.200s.", filename); | |
348 | buffer_free(&buffer); | |
349 | return 0; | |
350 | } | |
351 | /* Read cipher type. */ | |
352 | cipher_type = buffer_get_char(&buffer); | |
353 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
354 | ||
355 | /* Read the public key from the buffer. */ | |
356 | buffer_get_int(&buffer); | |
357 | prv->n = BN_new(); | |
358 | buffer_get_bignum(&buffer, prv->n); | |
359 | prv->e = BN_new(); | |
360 | buffer_get_bignum(&buffer, prv->e); | |
361 | if (comment_return) | |
362 | *comment_return = buffer_get_string(&buffer, NULL); | |
363 | else | |
364 | xfree(buffer_get_string(&buffer, NULL)); | |
365 | ||
366 | /* Check that it is a supported cipher. */ | |
8ce64345 | 367 | if (((cipher_mask1() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) & |
5260325f | 368 | (1 << cipher_type)) == 0) { |
369 | debug("Unsupported cipher %.100s used in key file %.200s.", | |
370 | cipher_name(cipher_type), filename); | |
371 | buffer_free(&buffer); | |
372 | goto fail; | |
373 | } | |
374 | /* Initialize space for decrypted data. */ | |
375 | buffer_init(&decrypted); | |
376 | buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); | |
377 | ||
378 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
8ce64345 | 379 | cipher_set_key_string(&cipher, cipher_type, passphrase); |
5260325f | 380 | cipher_decrypt(&cipher, (unsigned char *) cp, |
381 | (unsigned char *) buffer_ptr(&buffer), | |
382 | buffer_len(&buffer)); | |
383 | ||
8efc0c15 | 384 | buffer_free(&buffer); |
5260325f | 385 | |
386 | check1 = buffer_get_char(&decrypted); | |
387 | check2 = buffer_get_char(&decrypted); | |
388 | if (check1 != buffer_get_char(&decrypted) || | |
389 | check2 != buffer_get_char(&decrypted)) { | |
390 | if (strcmp(passphrase, "") != 0) | |
391 | debug("Bad passphrase supplied for key file %.200s.", filename); | |
392 | /* Bad passphrase. */ | |
393 | buffer_free(&decrypted); | |
394 | fail: | |
395 | BN_clear_free(prv->n); | |
a306f2dd | 396 | prv->n = NULL; |
5260325f | 397 | BN_clear_free(prv->e); |
a306f2dd | 398 | prv->e = NULL; |
5260325f | 399 | if (comment_return) |
400 | xfree(*comment_return); | |
401 | return 0; | |
402 | } | |
403 | /* Read the rest of the private key. */ | |
404 | prv->d = BN_new(); | |
405 | buffer_get_bignum(&decrypted, prv->d); | |
406 | prv->iqmp = BN_new(); | |
407 | buffer_get_bignum(&decrypted, prv->iqmp); /* u */ | |
408 | /* in SSL and SSH p and q are exchanged */ | |
409 | prv->q = BN_new(); | |
410 | buffer_get_bignum(&decrypted, prv->q); /* p */ | |
411 | prv->p = BN_new(); | |
412 | buffer_get_bignum(&decrypted, prv->p); /* q */ | |
413 | ||
414 | ctx = BN_CTX_new(); | |
415 | aux = BN_new(); | |
416 | ||
417 | BN_sub(aux, prv->q, BN_value_one()); | |
418 | prv->dmq1 = BN_new(); | |
419 | BN_mod(prv->dmq1, prv->d, aux, ctx); | |
420 | ||
421 | BN_sub(aux, prv->p, BN_value_one()); | |
422 | prv->dmp1 = BN_new(); | |
423 | BN_mod(prv->dmp1, prv->d, aux, ctx); | |
424 | ||
425 | BN_clear_free(aux); | |
426 | BN_CTX_free(ctx); | |
427 | ||
428 | buffer_free(&decrypted); | |
429 | ||
430 | return 1; | |
8efc0c15 | 431 | } |
a306f2dd | 432 | |
433 | int | |
434 | load_private_key_dsa(int fd, const char *passphrase, Key *k, char **comment_return) | |
435 | { | |
436 | DSA *dsa; | |
437 | BIO *in; | |
438 | FILE *fp; | |
439 | ||
440 | in = BIO_new(BIO_s_file()); | |
441 | if (in == NULL) { | |
442 | error("BIO_new failed"); | |
443 | return 0; | |
444 | } | |
445 | fp = fdopen(fd, "r"); | |
446 | if (fp == NULL) { | |
447 | error("fdopen failed"); | |
448 | return 0; | |
449 | } | |
450 | BIO_set_fp(in, fp, BIO_NOCLOSE); | |
451 | dsa = PEM_read_bio_DSAPrivateKey(in, NULL, NULL, (char *)passphrase); | |
452 | if (dsa == NULL) { | |
453 | debug("PEM_read_bio_DSAPrivateKey failed"); | |
454 | } else { | |
455 | /* replace k->dsa with loaded key */ | |
456 | DSA_free(k->dsa); | |
457 | k->dsa = dsa; | |
458 | } | |
459 | BIO_free(in); | |
460 | fclose(fp); | |
461 | if (comment_return) | |
462 | *comment_return = xstrdup("dsa w/o comment"); | |
463 | debug("read DSA private key done"); | |
464 | #ifdef DEBUG_DSS | |
465 | DSA_print_fp(stderr, dsa, 8); | |
466 | #endif | |
467 | return dsa != NULL ? 1 : 0; | |
468 | } | |
469 | ||
470 | int | |
471 | load_private_key(const char *filename, const char *passphrase, Key *key, | |
472 | char **comment_return) | |
473 | { | |
474 | int fd; | |
475 | int ret = 0; | |
476 | struct stat st; | |
477 | ||
478 | fd = open(filename, O_RDONLY); | |
479 | if (fd < 0) | |
480 | return 0; | |
481 | ||
3c62e7eb | 482 | #ifndef HAVE_CYGWIN |
483 | /* | |
484 | * check owner and modes. | |
485 | * This won't work on Windows under all circumstances so we drop | |
486 | * that check for now. | |
487 | */ | |
a306f2dd | 488 | if (fstat(fd, &st) < 0 || |
489 | (st.st_uid != 0 && st.st_uid != getuid()) || | |
490 | (st.st_mode & 077) != 0) { | |
491 | close(fd); | |
492 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
493 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
494 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
495 | error("Bad ownership or mode(0%3.3o) for '%s'.", | |
496 | st.st_mode & 0777, filename); | |
497 | error("It is recommended that your private key files are NOT accessible by others."); | |
498 | return 0; | |
499 | } | |
3c62e7eb | 500 | #endif |
a306f2dd | 501 | switch (key->type) { |
502 | case KEY_RSA: | |
503 | if (key->rsa->e != NULL) { | |
504 | BN_clear_free(key->rsa->e); | |
505 | key->rsa->e = NULL; | |
506 | } | |
507 | if (key->rsa->n != NULL) { | |
508 | BN_clear_free(key->rsa->n); | |
509 | key->rsa->n = NULL; | |
510 | } | |
511 | ret = load_private_key_rsa(fd, filename, passphrase, | |
512 | key->rsa, comment_return); | |
513 | break; | |
514 | case KEY_DSA: | |
515 | ret = load_private_key_dsa(fd, passphrase, key, comment_return); | |
516 | default: | |
517 | break; | |
518 | } | |
519 | close(fd); | |
520 | return ret; | |
521 | } | |
bcbf86ec | 522 | |
523 | int | |
524 | do_load_public_key(const char *filename, Key *k, char **commentp) | |
525 | { | |
526 | FILE *f; | |
527 | unsigned int bits; | |
528 | char line[1024]; | |
529 | char *cp; | |
530 | ||
531 | f = fopen(filename, "r"); | |
532 | if (f != NULL) { | |
533 | while (fgets(line, sizeof(line), f)) { | |
534 | line[sizeof(line)-1] = '\0'; | |
535 | cp = line; | |
536 | switch(*cp){ | |
537 | case '#': | |
538 | case '\n': | |
539 | case '\0': | |
540 | continue; | |
541 | } | |
542 | /* Skip leading whitespace. */ | |
543 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
544 | ; | |
545 | if (*cp) { | |
546 | bits = key_read(k, &cp); | |
547 | if (bits != 0) { | |
548 | if (commentp) | |
549 | *commentp=xstrdup(filename); | |
550 | fclose(f); | |
551 | return 1; | |
552 | } | |
553 | } | |
554 | } | |
555 | fclose(f); | |
556 | } | |
557 | return 0; | |
558 | } | |
559 | ||
560 | /* load public key from pubkey file */ | |
561 | int | |
562 | try_load_public_key(const char *filename, Key *k, char **commentp) | |
563 | { | |
564 | char pub[MAXPATHLEN]; | |
565 | ||
566 | if (do_load_public_key(filename, k, commentp) == 1) | |
567 | return 1; | |
568 | if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN) | |
569 | return 0; | |
570 | if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN) | |
571 | return 0; | |
572 | if (do_load_public_key(pub, k, commentp) == 1) | |
573 | return 1; | |
574 | return 0; | |
575 | } |