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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * This file contains functions for reading and writing identity files, and | |
6 | * for reading the passphrase from the user. | |
7 | * | |
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. | |
36 | */ | |
37 | ||
38 | #include "includes.h" | |
39 | RCSID("$OpenBSD: authfile.c,v 1.24 2000/12/20 19:26:56 markus Exp $"); | |
40 | ||
41 | #include <openssl/bn.h> | |
42 | #include <openssl/dsa.h> | |
43 | #include <openssl/rsa.h> | |
44 | #include <openssl/err.h> | |
45 | #include <openssl/pem.h> | |
46 | #include <openssl/evp.h> | |
47 | ||
48 | #include "xmalloc.h" | |
49 | #include "buffer.h" | |
50 | #include "bufaux.h" | |
51 | #include "ssh.h" | |
52 | #include "key.h" | |
53 | ||
54 | /* Version identification string for identity files. */ | |
55 | #define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n" | |
56 | ||
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 | */ | |
63 | ||
64 | int | |
65 | save_private_key_rsa1(const char *filename, const char *passphrase, | |
66 | RSA *key, const char *comment) | |
67 | { | |
68 | Buffer buffer, encrypted; | |
69 | char buf[100], *cp; | |
70 | int fd, i; | |
71 | CipherContext ciphercontext; | |
72 | Cipher *cipher; | |
73 | u_int32_t rand; | |
74 | ||
75 | /* | |
76 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
77 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
78 | */ | |
79 | if (strcmp(passphrase, "") == 0) | |
80 | cipher = cipher_by_number(SSH_CIPHER_NONE); | |
81 | else | |
82 | cipher = cipher_by_number(SSH_AUTHFILE_CIPHER); | |
83 | if (cipher == NULL) | |
84 | fatal("save_private_key_rsa: bad cipher"); | |
85 | ||
86 | /* This buffer is used to built the secret part of the private key. */ | |
87 | buffer_init(&buffer); | |
88 | ||
89 | /* Put checkbytes for checking passphrase validity. */ | |
90 | rand = arc4random(); | |
91 | buf[0] = rand & 0xff; | |
92 | buf[1] = (rand >> 8) & 0xff; | |
93 | buf[2] = buf[0]; | |
94 | buf[3] = buf[1]; | |
95 | buffer_append(&buffer, buf, 4); | |
96 | ||
97 | /* | |
98 | * Store the private key (n and e will not be stored because they | |
99 | * will be stored in plain text, and storing them also in encrypted | |
100 | * format would just give known plaintext). | |
101 | */ | |
102 | buffer_put_bignum(&buffer, key->d); | |
103 | buffer_put_bignum(&buffer, key->iqmp); | |
104 | buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */ | |
105 | buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */ | |
106 | ||
107 | /* Pad the part to be encrypted until its size is a multiple of 8. */ | |
108 | while (buffer_len(&buffer) % 8 != 0) | |
109 | buffer_put_char(&buffer, 0); | |
110 | ||
111 | /* This buffer will be used to contain the data in the file. */ | |
112 | buffer_init(&encrypted); | |
113 | ||
114 | /* First store keyfile id string. */ | |
115 | cp = AUTHFILE_ID_STRING; | |
116 | for (i = 0; cp[i]; i++) | |
117 | buffer_put_char(&encrypted, cp[i]); | |
118 | buffer_put_char(&encrypted, 0); | |
119 | ||
120 | /* Store cipher type. */ | |
121 | buffer_put_char(&encrypted, cipher->number); | |
122 | buffer_put_int(&encrypted, 0); /* For future extension */ | |
123 | ||
124 | /* Store public key. This will be in plain text. */ | |
125 | buffer_put_int(&encrypted, BN_num_bits(key->n)); | |
126 | buffer_put_bignum(&encrypted, key->n); | |
127 | buffer_put_bignum(&encrypted, key->e); | |
128 | buffer_put_string(&encrypted, comment, strlen(comment)); | |
129 | ||
130 | /* Allocate space for the private part of the key in the buffer. */ | |
131 | buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); | |
132 | ||
133 | cipher_set_key_string(&ciphercontext, cipher, passphrase); | |
134 | cipher_encrypt(&ciphercontext, (u_char *) cp, | |
135 | (u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); | |
136 | memset(&ciphercontext, 0, sizeof(ciphercontext)); | |
137 | ||
138 | /* Destroy temporary data. */ | |
139 | memset(buf, 0, sizeof(buf)); | |
140 | buffer_free(&buffer); | |
141 | ||
142 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
143 | if (fd < 0) | |
144 | return 0; | |
145 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != | |
146 | buffer_len(&encrypted)) { | |
147 | debug("Write to key file %.200s failed: %.100s", filename, | |
148 | strerror(errno)); | |
149 | buffer_free(&encrypted); | |
150 | close(fd); | |
151 | unlink(filename); | |
152 | return 0; | |
153 | } | |
154 | close(fd); | |
155 | buffer_free(&encrypted); | |
156 | return 1; | |
157 | } | |
158 | ||
159 | /* save SSH2 key in OpenSSL PEM format */ | |
160 | int | |
161 | save_private_key_ssh2(const char *filename, const char *_passphrase, | |
162 | Key *key, const char *comment) | |
163 | { | |
164 | FILE *fp; | |
165 | int fd; | |
166 | int success = 0; | |
167 | int len = strlen(_passphrase); | |
168 | char *passphrase = (len > 0) ? (char *)_passphrase : NULL; | |
169 | EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; | |
170 | ||
171 | if (len > 0 && len <= 4) { | |
172 | error("passphrase too short: %d bytes", len); | |
173 | errno = 0; | |
174 | return 0; | |
175 | } | |
176 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
177 | if (fd < 0) { | |
178 | debug("open %s failed", filename); | |
179 | return 0; | |
180 | } | |
181 | fp = fdopen(fd, "w"); | |
182 | if (fp == NULL ) { | |
183 | debug("fdopen %s failed", filename); | |
184 | close(fd); | |
185 | return 0; | |
186 | } | |
187 | switch (key->type) { | |
188 | case KEY_DSA: | |
189 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
190 | cipher, passphrase, len, NULL, NULL); | |
191 | break; | |
192 | case KEY_RSA: | |
193 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
194 | cipher, passphrase, len, NULL, NULL); | |
195 | break; | |
196 | } | |
197 | fclose(fp); | |
198 | return success; | |
199 | } | |
200 | ||
201 | int | |
202 | save_private_key(const char *filename, const char *passphrase, Key *key, | |
203 | const char *comment) | |
204 | { | |
205 | switch (key->type) { | |
206 | case KEY_RSA1: | |
207 | return save_private_key_rsa1(filename, passphrase, key->rsa, comment); | |
208 | break; | |
209 | case KEY_DSA: | |
210 | case KEY_RSA: | |
211 | return save_private_key_ssh2(filename, passphrase, key, comment); | |
212 | break; | |
213 | default: | |
214 | break; | |
215 | } | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* | |
220 | * Loads the public part of the key file. Returns 0 if an error was | |
221 | * encountered (the file does not exist or is not readable), and non-zero | |
222 | * otherwise. | |
223 | */ | |
224 | ||
225 | int | |
226 | load_public_key_rsa(const char *filename, RSA * pub, char **comment_return) | |
227 | { | |
228 | int fd, i; | |
229 | off_t len; | |
230 | Buffer buffer; | |
231 | char *cp; | |
232 | ||
233 | fd = open(filename, O_RDONLY); | |
234 | if (fd < 0) | |
235 | return 0; | |
236 | len = lseek(fd, (off_t) 0, SEEK_END); | |
237 | lseek(fd, (off_t) 0, SEEK_SET); | |
238 | ||
239 | buffer_init(&buffer); | |
240 | buffer_append_space(&buffer, &cp, len); | |
241 | ||
242 | if (read(fd, cp, (size_t) len) != (size_t) len) { | |
243 | debug("Read from key file %.200s failed: %.100s", filename, | |
244 | strerror(errno)); | |
245 | buffer_free(&buffer); | |
246 | close(fd); | |
247 | return 0; | |
248 | } | |
249 | close(fd); | |
250 | ||
251 | /* Check that it is at least big enought to contain the ID string. */ | |
252 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { | |
253 | debug3("Bad RSA1 key file %.200s.", filename); | |
254 | buffer_free(&buffer); | |
255 | return 0; | |
256 | } | |
257 | /* | |
258 | * Make sure it begins with the id string. Consume the id string | |
259 | * from the buffer. | |
260 | */ | |
261 | for (i = 0; i < (u_int) strlen(AUTHFILE_ID_STRING) + 1; i++) | |
262 | if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { | |
263 | debug3("Bad RSA1 key file %.200s.", filename); | |
264 | buffer_free(&buffer); | |
265 | return 0; | |
266 | } | |
267 | /* Skip cipher type and reserved data. */ | |
268 | (void) buffer_get_char(&buffer); /* cipher type */ | |
269 | (void) buffer_get_int(&buffer); /* reserved */ | |
270 | ||
271 | /* Read the public key from the buffer. */ | |
272 | buffer_get_int(&buffer); | |
273 | /* XXX alloc */ | |
274 | if (pub->n == NULL) | |
275 | pub->n = BN_new(); | |
276 | buffer_get_bignum(&buffer, pub->n); | |
277 | /* XXX alloc */ | |
278 | if (pub->e == NULL) | |
279 | pub->e = BN_new(); | |
280 | buffer_get_bignum(&buffer, pub->e); | |
281 | if (comment_return) | |
282 | *comment_return = buffer_get_string(&buffer, NULL); | |
283 | /* The encrypted private part is not parsed by this function. */ | |
284 | ||
285 | buffer_free(&buffer); | |
286 | ||
287 | return 1; | |
288 | } | |
289 | ||
290 | /* load public key from private-key file */ | |
291 | int | |
292 | load_public_key(const char *filename, Key * key, char **comment_return) | |
293 | { | |
294 | switch (key->type) { | |
295 | case KEY_RSA1: | |
296 | return load_public_key_rsa(filename, key->rsa, comment_return); | |
297 | break; | |
298 | case KEY_DSA: | |
299 | case KEY_RSA: | |
300 | default: | |
301 | break; | |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Loads the private key from the file. Returns 0 if an error is encountered | |
308 | * (file does not exist or is not readable, or passphrase is bad). This | |
309 | * initializes the private key. | |
310 | * Assumes we are called under uid of the owner of the file. | |
311 | */ | |
312 | ||
313 | int | |
314 | load_private_key_rsa1(int fd, const char *filename, | |
315 | const char *passphrase, RSA * prv, char **comment_return) | |
316 | { | |
317 | int i, check1, check2, cipher_type; | |
318 | off_t len; | |
319 | Buffer buffer, decrypted; | |
320 | char *cp; | |
321 | CipherContext ciphercontext; | |
322 | Cipher *cipher; | |
323 | BN_CTX *ctx; | |
324 | BIGNUM *aux; | |
325 | ||
326 | len = lseek(fd, (off_t) 0, SEEK_END); | |
327 | lseek(fd, (off_t) 0, SEEK_SET); | |
328 | ||
329 | buffer_init(&buffer); | |
330 | buffer_append_space(&buffer, &cp, len); | |
331 | ||
332 | if (read(fd, cp, (size_t) len) != (size_t) len) { | |
333 | debug("Read from key file %.200s failed: %.100s", filename, | |
334 | strerror(errno)); | |
335 | buffer_free(&buffer); | |
336 | close(fd); | |
337 | return 0; | |
338 | } | |
339 | close(fd); | |
340 | ||
341 | /* Check that it is at least big enought to contain the ID string. */ | |
342 | if (len < strlen(AUTHFILE_ID_STRING) + 1) { | |
343 | debug3("Bad RSA1 key file %.200s.", filename); | |
344 | buffer_free(&buffer); | |
345 | return 0; | |
346 | } | |
347 | /* | |
348 | * Make sure it begins with the id string. Consume the id string | |
349 | * from the buffer. | |
350 | */ | |
351 | for (i = 0; i < (u_int) strlen(AUTHFILE_ID_STRING) + 1; i++) | |
352 | if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { | |
353 | debug3("Bad RSA1 key file %.200s.", filename); | |
354 | buffer_free(&buffer); | |
355 | return 0; | |
356 | } | |
357 | /* Read cipher type. */ | |
358 | cipher_type = buffer_get_char(&buffer); | |
359 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
360 | ||
361 | /* Read the public key from the buffer. */ | |
362 | buffer_get_int(&buffer); | |
363 | prv->n = BN_new(); | |
364 | buffer_get_bignum(&buffer, prv->n); | |
365 | prv->e = BN_new(); | |
366 | buffer_get_bignum(&buffer, prv->e); | |
367 | if (comment_return) | |
368 | *comment_return = buffer_get_string(&buffer, NULL); | |
369 | else | |
370 | xfree(buffer_get_string(&buffer, NULL)); | |
371 | ||
372 | /* Check that it is a supported cipher. */ | |
373 | cipher = cipher_by_number(cipher_type); | |
374 | if (cipher == NULL) { | |
375 | debug("Unsupported cipher %d used in key file %.200s.", | |
376 | cipher_type, filename); | |
377 | buffer_free(&buffer); | |
378 | goto fail; | |
379 | } | |
380 | /* Initialize space for decrypted data. */ | |
381 | buffer_init(&decrypted); | |
382 | buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); | |
383 | ||
384 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
385 | cipher_set_key_string(&ciphercontext, cipher, passphrase); | |
386 | cipher_decrypt(&ciphercontext, (u_char *) cp, | |
387 | (u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); | |
388 | memset(&ciphercontext, 0, sizeof(ciphercontext)); | |
389 | buffer_free(&buffer); | |
390 | ||
391 | check1 = buffer_get_char(&decrypted); | |
392 | check2 = buffer_get_char(&decrypted); | |
393 | if (check1 != buffer_get_char(&decrypted) || | |
394 | check2 != buffer_get_char(&decrypted)) { | |
395 | if (strcmp(passphrase, "") != 0) | |
396 | debug("Bad passphrase supplied for key file %.200s.", filename); | |
397 | /* Bad passphrase. */ | |
398 | buffer_free(&decrypted); | |
399 | fail: | |
400 | BN_clear_free(prv->n); | |
401 | prv->n = NULL; | |
402 | BN_clear_free(prv->e); | |
403 | prv->e = NULL; | |
404 | if (comment_return) | |
405 | xfree(*comment_return); | |
406 | return 0; | |
407 | } | |
408 | /* Read the rest of the private key. */ | |
409 | prv->d = BN_new(); | |
410 | buffer_get_bignum(&decrypted, prv->d); | |
411 | prv->iqmp = BN_new(); | |
412 | buffer_get_bignum(&decrypted, prv->iqmp); /* u */ | |
413 | /* in SSL and SSH p and q are exchanged */ | |
414 | prv->q = BN_new(); | |
415 | buffer_get_bignum(&decrypted, prv->q); /* p */ | |
416 | prv->p = BN_new(); | |
417 | buffer_get_bignum(&decrypted, prv->p); /* q */ | |
418 | ||
419 | ctx = BN_CTX_new(); | |
420 | aux = BN_new(); | |
421 | ||
422 | BN_sub(aux, prv->q, BN_value_one()); | |
423 | prv->dmq1 = BN_new(); | |
424 | BN_mod(prv->dmq1, prv->d, aux, ctx); | |
425 | ||
426 | BN_sub(aux, prv->p, BN_value_one()); | |
427 | prv->dmp1 = BN_new(); | |
428 | BN_mod(prv->dmp1, prv->d, aux, ctx); | |
429 | ||
430 | BN_clear_free(aux); | |
431 | BN_CTX_free(ctx); | |
432 | ||
433 | buffer_free(&decrypted); | |
434 | ||
435 | return 1; | |
436 | } | |
437 | ||
438 | int | |
439 | load_private_key_ssh2(int fd, const char *passphrase, Key *k, char **comment_return) | |
440 | { | |
441 | FILE *fp; | |
442 | int success = 0; | |
443 | EVP_PKEY *pk = NULL; | |
444 | char *name = "<no key>"; | |
445 | ||
446 | fp = fdopen(fd, "r"); | |
447 | if (fp == NULL) { | |
448 | error("fdopen failed"); | |
449 | return 0; | |
450 | } | |
451 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); | |
452 | if (pk == NULL) { | |
453 | debug("PEM_read_PrivateKey failed"); | |
454 | (void)ERR_get_error(); | |
455 | } else if (pk->type == EVP_PKEY_RSA) { | |
456 | /* replace k->rsa with loaded key */ | |
457 | if (k->type == KEY_RSA || k->type == KEY_UNSPEC) { | |
458 | if (k->rsa != NULL) | |
459 | RSA_free(k->rsa); | |
460 | k->rsa = EVP_PKEY_get1_RSA(pk); | |
461 | k->type = KEY_RSA; | |
462 | name = "rsa w/o comment"; | |
463 | success = 1; | |
464 | #ifdef DEBUG_PK | |
465 | RSA_print_fp(stderr, k->rsa, 8); | |
466 | #endif | |
467 | } | |
468 | } else if (pk->type == EVP_PKEY_DSA) { | |
469 | /* replace k->dsa with loaded key */ | |
470 | if (k->type == KEY_DSA || k->type == KEY_UNSPEC) { | |
471 | if (k->dsa != NULL) | |
472 | DSA_free(k->dsa); | |
473 | k->dsa = EVP_PKEY_get1_DSA(pk); | |
474 | k->type = KEY_DSA; | |
475 | name = "dsa w/o comment"; | |
476 | #ifdef DEBUG_PK | |
477 | DSA_print_fp(stderr, k->dsa, 8); | |
478 | #endif | |
479 | success = 1; | |
480 | } | |
481 | } else { | |
482 | error("PEM_read_PrivateKey: mismatch or " | |
483 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
484 | } | |
485 | fclose(fp); | |
486 | if (pk != NULL) | |
487 | EVP_PKEY_free(pk); | |
488 | if (success && comment_return) | |
489 | *comment_return = xstrdup(name); | |
490 | debug("read SSH2 private key done: name %s success %d", name, success); | |
491 | return success; | |
492 | } | |
493 | ||
494 | int | |
495 | load_private_key(const char *filename, const char *passphrase, Key *key, | |
496 | char **comment_return) | |
497 | { | |
498 | int fd; | |
499 | int ret = 0; | |
500 | struct stat st; | |
501 | ||
502 | fd = open(filename, O_RDONLY); | |
503 | if (fd < 0) | |
504 | return 0; | |
505 | ||
506 | /* check owner and modes */ | |
507 | #ifdef HAVE_CYGWIN | |
508 | if (check_ntsec(filename)) | |
509 | #endif | |
510 | if (fstat(fd, &st) < 0 || | |
511 | (st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) || | |
512 | (st.st_mode & 077) != 0) { | |
513 | close(fd); | |
514 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
515 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
516 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
517 | error("Bad ownership or mode(0%3.3o) for '%s'.", | |
518 | st.st_mode & 0777, filename); | |
519 | error("It is recommended that your private key files are NOT accessible by others."); | |
520 | return 0; | |
521 | } | |
522 | switch (key->type) { | |
523 | case KEY_RSA1: | |
524 | if (key->rsa->e != NULL) { | |
525 | BN_clear_free(key->rsa->e); | |
526 | key->rsa->e = NULL; | |
527 | } | |
528 | if (key->rsa->n != NULL) { | |
529 | BN_clear_free(key->rsa->n); | |
530 | key->rsa->n = NULL; | |
531 | } | |
532 | ret = load_private_key_rsa1(fd, filename, passphrase, | |
533 | key->rsa, comment_return); | |
534 | break; | |
535 | case KEY_DSA: | |
536 | case KEY_RSA: | |
537 | case KEY_UNSPEC: | |
538 | ret = load_private_key_ssh2(fd, passphrase, key, comment_return); | |
539 | default: | |
540 | break; | |
541 | } | |
542 | close(fd); | |
543 | return ret; | |
544 | } | |
545 | ||
546 | int | |
547 | do_load_public_key(const char *filename, Key *k, char **commentp) | |
548 | { | |
549 | FILE *f; | |
550 | char line[1024]; | |
551 | char *cp; | |
552 | ||
553 | f = fopen(filename, "r"); | |
554 | if (f != NULL) { | |
555 | while (fgets(line, sizeof(line), f)) { | |
556 | line[sizeof(line)-1] = '\0'; | |
557 | cp = line; | |
558 | switch(*cp){ | |
559 | case '#': | |
560 | case '\n': | |
561 | case '\0': | |
562 | continue; | |
563 | } | |
564 | /* Skip leading whitespace. */ | |
565 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
566 | ; | |
567 | if (*cp) { | |
568 | if (key_read(k, &cp) == 1) { | |
569 | if (commentp) | |
570 | *commentp=xstrdup(filename); | |
571 | fclose(f); | |
572 | return 1; | |
573 | } | |
574 | } | |
575 | } | |
576 | fclose(f); | |
577 | } | |
578 | return 0; | |
579 | } | |
580 | ||
581 | /* load public key from pubkey file */ | |
582 | int | |
583 | try_load_public_key(const char *filename, Key *k, char **commentp) | |
584 | { | |
585 | char pub[MAXPATHLEN]; | |
586 | ||
587 | if (do_load_public_key(filename, k, commentp) == 1) | |
588 | return 1; | |
589 | if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN) | |
590 | return 0; | |
591 | if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN) | |
592 | return 0; | |
593 | if (do_load_public_key(pub, k, commentp) == 1) | |
594 | return 1; | |
595 | return 0; | |
596 | } |