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3c0ef626 | 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" | |
416fd2a8 | 39 | RCSID("$OpenBSD: authfile.c,v 1.55 2003/09/18 07:56:05 markus Exp $"); |
3c0ef626 | 40 | |
41 | #include <openssl/err.h> | |
42 | #include <openssl/evp.h> | |
43 | #include <openssl/pem.h> | |
44 | ||
45 | #include "cipher.h" | |
46 | #include "xmalloc.h" | |
47 | #include "buffer.h" | |
48 | #include "bufaux.h" | |
49 | #include "key.h" | |
50 | #include "ssh.h" | |
51 | #include "log.h" | |
52 | #include "authfile.h" | |
e9a17296 | 53 | #include "rsa.h" |
3c0ef626 | 54 | |
55 | /* Version identification string for SSH v1 identity files. */ | |
56 | static const char authfile_id_string[] = | |
57 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; | |
58 | ||
59 | /* | |
60 | * Saves the authentication (private) key in a file, encrypting it with | |
61 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
62 | * precede the key to provide identification of the key without needing a | |
63 | * passphrase. | |
64 | */ | |
65 | ||
66 | static int | |
67 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, | |
68 | const char *comment) | |
69 | { | |
70 | Buffer buffer, encrypted; | |
e9a17296 | 71 | u_char buf[100], *cp; |
72 | int fd, i, cipher_num; | |
3c0ef626 | 73 | CipherContext ciphercontext; |
74 | Cipher *cipher; | |
75 | u_int32_t rand; | |
76 | ||
77 | /* | |
78 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
79 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
80 | */ | |
e9a17296 | 81 | cipher_num = (strcmp(passphrase, "") == 0) ? |
82 | SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; | |
83 | if ((cipher = cipher_by_number(cipher_num)) == NULL) | |
3c0ef626 | 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->rsa->d); | |
103 | buffer_put_bignum(&buffer, key->rsa->iqmp); | |
104 | buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ | |
105 | buffer_put_bignum(&buffer, key->rsa->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 | for (i = 0; authfile_id_string[i]; i++) | |
116 | buffer_put_char(&encrypted, authfile_id_string[i]); | |
117 | buffer_put_char(&encrypted, 0); | |
118 | ||
119 | /* Store cipher type. */ | |
e9a17296 | 120 | buffer_put_char(&encrypted, cipher_num); |
3c0ef626 | 121 | buffer_put_int(&encrypted, 0); /* For future extension */ |
122 | ||
123 | /* Store public key. This will be in plain text. */ | |
124 | buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); | |
125 | buffer_put_bignum(&encrypted, key->rsa->n); | |
126 | buffer_put_bignum(&encrypted, key->rsa->e); | |
127 | buffer_put_cstring(&encrypted, comment); | |
128 | ||
129 | /* Allocate space for the private part of the key in the buffer. */ | |
e9a17296 | 130 | cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
3c0ef626 | 131 | |
e9a17296 | 132 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
133 | CIPHER_ENCRYPT); | |
134 | cipher_crypt(&ciphercontext, cp, | |
135 | buffer_ptr(&buffer), buffer_len(&buffer)); | |
136 | cipher_cleanup(&ciphercontext); | |
3c0ef626 | 137 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
138 | ||
139 | /* Destroy temporary data. */ | |
140 | memset(buf, 0, sizeof(buf)); | |
141 | buffer_free(&buffer); | |
142 | ||
143 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
144 | if (fd < 0) { | |
145 | error("open %s failed: %s.", filename, strerror(errno)); | |
416fd2a8 | 146 | buffer_free(&encrypted); |
3c0ef626 | 147 | return 0; |
148 | } | |
149 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != | |
150 | buffer_len(&encrypted)) { | |
151 | error("write to key file %s failed: %s", filename, | |
e9a17296 | 152 | strerror(errno)); |
3c0ef626 | 153 | buffer_free(&encrypted); |
154 | close(fd); | |
155 | unlink(filename); | |
156 | return 0; | |
157 | } | |
158 | close(fd); | |
159 | buffer_free(&encrypted); | |
160 | return 1; | |
161 | } | |
162 | ||
163 | /* save SSH v2 key in OpenSSL PEM format */ | |
164 | static int | |
165 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, | |
166 | const char *comment) | |
167 | { | |
168 | FILE *fp; | |
169 | int fd; | |
170 | int success = 0; | |
171 | int len = strlen(_passphrase); | |
e9a17296 | 172 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
173 | const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; | |
3c0ef626 | 174 | |
175 | if (len > 0 && len <= 4) { | |
176 | error("passphrase too short: have %d bytes, need > 4", len); | |
177 | return 0; | |
178 | } | |
179 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
180 | if (fd < 0) { | |
181 | error("open %s failed: %s.", filename, strerror(errno)); | |
182 | return 0; | |
183 | } | |
184 | fp = fdopen(fd, "w"); | |
185 | if (fp == NULL ) { | |
186 | error("fdopen %s failed: %s.", filename, strerror(errno)); | |
187 | close(fd); | |
188 | return 0; | |
189 | } | |
190 | switch (key->type) { | |
191 | case KEY_DSA: | |
192 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
193 | cipher, passphrase, len, NULL, NULL); | |
194 | break; | |
195 | case KEY_RSA: | |
196 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
197 | cipher, passphrase, len, NULL, NULL); | |
198 | break; | |
199 | } | |
200 | fclose(fp); | |
201 | return success; | |
202 | } | |
203 | ||
204 | int | |
205 | key_save_private(Key *key, const char *filename, const char *passphrase, | |
206 | const char *comment) | |
207 | { | |
208 | switch (key->type) { | |
209 | case KEY_RSA1: | |
210 | return key_save_private_rsa1(key, filename, passphrase, | |
211 | comment); | |
212 | break; | |
213 | case KEY_DSA: | |
214 | case KEY_RSA: | |
215 | return key_save_private_pem(key, filename, passphrase, | |
216 | comment); | |
217 | break; | |
218 | default: | |
219 | break; | |
220 | } | |
221 | error("key_save_private: cannot save key type %d", key->type); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was | |
227 | * encountered (the file does not exist or is not readable), and the key | |
228 | * otherwise. | |
229 | */ | |
230 | ||
231 | static Key * | |
232 | key_load_public_rsa1(int fd, const char *filename, char **commentp) | |
233 | { | |
234 | Buffer buffer; | |
235 | Key *pub; | |
1c14df9e | 236 | struct stat st; |
3c0ef626 | 237 | char *cp; |
238 | int i; | |
239 | off_t len; | |
240 | ||
1c14df9e | 241 | if (fstat(fd, &st) < 0) { |
242 | error("fstat for key file %.200s failed: %.100s", | |
243 | filename, strerror(errno)); | |
244 | return NULL; | |
245 | } | |
246 | len = st.st_size; | |
3c0ef626 | 247 | |
248 | buffer_init(&buffer); | |
e9a17296 | 249 | cp = buffer_append_space(&buffer, len); |
3c0ef626 | 250 | |
251 | if (read(fd, cp, (size_t) len) != (size_t) len) { | |
252 | debug("Read from key file %.200s failed: %.100s", filename, | |
253 | strerror(errno)); | |
254 | buffer_free(&buffer); | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | /* Check that it is at least big enough to contain the ID string. */ | |
259 | if (len < sizeof(authfile_id_string)) { | |
260 | debug3("Not a RSA1 key file %.200s.", filename); | |
261 | buffer_free(&buffer); | |
262 | return NULL; | |
263 | } | |
264 | /* | |
265 | * Make sure it begins with the id string. Consume the id string | |
266 | * from the buffer. | |
267 | */ | |
268 | for (i = 0; i < sizeof(authfile_id_string); i++) | |
269 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
270 | debug3("Not a RSA1 key file %.200s.", filename); | |
271 | buffer_free(&buffer); | |
272 | return NULL; | |
273 | } | |
274 | /* Skip cipher type and reserved data. */ | |
275 | (void) buffer_get_char(&buffer); /* cipher type */ | |
276 | (void) buffer_get_int(&buffer); /* reserved */ | |
277 | ||
278 | /* Read the public key from the buffer. */ | |
ff2d7a98 | 279 | (void) buffer_get_int(&buffer); |
3c0ef626 | 280 | pub = key_new(KEY_RSA1); |
281 | buffer_get_bignum(&buffer, pub->rsa->n); | |
282 | buffer_get_bignum(&buffer, pub->rsa->e); | |
283 | if (commentp) | |
284 | *commentp = buffer_get_string(&buffer, NULL); | |
285 | /* The encrypted private part is not parsed by this function. */ | |
286 | ||
287 | buffer_free(&buffer); | |
288 | return pub; | |
289 | } | |
290 | ||
291 | /* load public key from private-key file, works only for SSH v1 */ | |
292 | Key * | |
293 | key_load_public_type(int type, const char *filename, char **commentp) | |
294 | { | |
295 | Key *pub; | |
296 | int fd; | |
297 | ||
298 | if (type == KEY_RSA1) { | |
299 | fd = open(filename, O_RDONLY); | |
300 | if (fd < 0) | |
301 | return NULL; | |
302 | pub = key_load_public_rsa1(fd, filename, commentp); | |
303 | close(fd); | |
304 | return pub; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Loads the private key from the file. Returns 0 if an error is encountered | |
311 | * (file does not exist or is not readable, or passphrase is bad). This | |
312 | * initializes the private key. | |
313 | * Assumes we are called under uid of the owner of the file. | |
314 | */ | |
315 | ||
316 | static Key * | |
317 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, | |
318 | char **commentp) | |
319 | { | |
320 | int i, check1, check2, cipher_type; | |
321 | off_t len; | |
322 | Buffer buffer, decrypted; | |
e9a17296 | 323 | u_char *cp; |
3c0ef626 | 324 | CipherContext ciphercontext; |
325 | Cipher *cipher; | |
3c0ef626 | 326 | Key *prv = NULL; |
1c14df9e | 327 | struct stat st; |
3c0ef626 | 328 | |
1c14df9e | 329 | if (fstat(fd, &st) < 0) { |
330 | error("fstat for key file %.200s failed: %.100s", | |
331 | filename, strerror(errno)); | |
332 | close(fd); | |
333 | return NULL; | |
334 | } | |
335 | len = st.st_size; | |
3c0ef626 | 336 | |
337 | buffer_init(&buffer); | |
e9a17296 | 338 | cp = buffer_append_space(&buffer, len); |
3c0ef626 | 339 | |
340 | if (read(fd, cp, (size_t) len) != (size_t) len) { | |
341 | debug("Read from key file %.200s failed: %.100s", filename, | |
342 | strerror(errno)); | |
343 | buffer_free(&buffer); | |
344 | close(fd); | |
345 | return NULL; | |
346 | } | |
347 | ||
348 | /* Check that it is at least big enough to contain the ID string. */ | |
349 | if (len < sizeof(authfile_id_string)) { | |
350 | debug3("Not a RSA1 key file %.200s.", filename); | |
351 | buffer_free(&buffer); | |
352 | close(fd); | |
353 | return NULL; | |
354 | } | |
355 | /* | |
356 | * Make sure it begins with the id string. Consume the id string | |
357 | * from the buffer. | |
358 | */ | |
359 | for (i = 0; i < sizeof(authfile_id_string); i++) | |
360 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
361 | debug3("Not a RSA1 key file %.200s.", filename); | |
362 | buffer_free(&buffer); | |
363 | close(fd); | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | /* Read cipher type. */ | |
368 | cipher_type = buffer_get_char(&buffer); | |
369 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
370 | ||
371 | /* Read the public key from the buffer. */ | |
ff2d7a98 | 372 | (void) buffer_get_int(&buffer); |
3c0ef626 | 373 | prv = key_new_private(KEY_RSA1); |
374 | ||
375 | buffer_get_bignum(&buffer, prv->rsa->n); | |
376 | buffer_get_bignum(&buffer, prv->rsa->e); | |
377 | if (commentp) | |
378 | *commentp = buffer_get_string(&buffer, NULL); | |
379 | else | |
380 | xfree(buffer_get_string(&buffer, NULL)); | |
381 | ||
382 | /* Check that it is a supported cipher. */ | |
383 | cipher = cipher_by_number(cipher_type); | |
384 | if (cipher == NULL) { | |
385 | debug("Unsupported cipher %d used in key file %.200s.", | |
386 | cipher_type, filename); | |
387 | buffer_free(&buffer); | |
388 | goto fail; | |
389 | } | |
390 | /* Initialize space for decrypted data. */ | |
391 | buffer_init(&decrypted); | |
e9a17296 | 392 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
3c0ef626 | 393 | |
394 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
e9a17296 | 395 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
396 | CIPHER_DECRYPT); | |
397 | cipher_crypt(&ciphercontext, cp, | |
398 | buffer_ptr(&buffer), buffer_len(&buffer)); | |
399 | cipher_cleanup(&ciphercontext); | |
3c0ef626 | 400 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
401 | buffer_free(&buffer); | |
402 | ||
403 | check1 = buffer_get_char(&decrypted); | |
404 | check2 = buffer_get_char(&decrypted); | |
405 | if (check1 != buffer_get_char(&decrypted) || | |
406 | check2 != buffer_get_char(&decrypted)) { | |
407 | if (strcmp(passphrase, "") != 0) | |
408 | debug("Bad passphrase supplied for key file %.200s.", | |
409 | filename); | |
410 | /* Bad passphrase. */ | |
411 | buffer_free(&decrypted); | |
412 | goto fail; | |
413 | } | |
414 | /* Read the rest of the private key. */ | |
415 | buffer_get_bignum(&decrypted, prv->rsa->d); | |
416 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
417 | /* in SSL and SSH v1 p and q are exchanged */ | |
418 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
419 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
420 | ||
421 | /* calculate p-1 and q-1 */ | |
e9a17296 | 422 | rsa_generate_additional_parameters(prv->rsa); |
3c0ef626 | 423 | |
424 | buffer_free(&decrypted); | |
1c14df9e | 425 | |
426 | /* enable blinding */ | |
427 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { | |
428 | error("key_load_private_rsa1: RSA_blinding_on failed"); | |
429 | goto fail; | |
430 | } | |
3c0ef626 | 431 | close(fd); |
432 | return prv; | |
433 | ||
434 | fail: | |
435 | if (commentp) | |
436 | xfree(*commentp); | |
437 | close(fd); | |
438 | key_free(prv); | |
439 | return NULL; | |
440 | } | |
441 | ||
ff2d7a98 | 442 | Key * |
3c0ef626 | 443 | key_load_private_pem(int fd, int type, const char *passphrase, |
444 | char **commentp) | |
445 | { | |
446 | FILE *fp; | |
447 | EVP_PKEY *pk = NULL; | |
448 | Key *prv = NULL; | |
449 | char *name = "<no key>"; | |
450 | ||
451 | fp = fdopen(fd, "r"); | |
452 | if (fp == NULL) { | |
453 | error("fdopen failed: %s", strerror(errno)); | |
454 | close(fd); | |
455 | return NULL; | |
456 | } | |
457 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); | |
458 | if (pk == NULL) { | |
459 | debug("PEM_read_PrivateKey failed"); | |
460 | (void)ERR_get_error(); | |
461 | } else if (pk->type == EVP_PKEY_RSA && | |
e9a17296 | 462 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
3c0ef626 | 463 | prv = key_new(KEY_UNSPEC); |
464 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
465 | prv->type = KEY_RSA; | |
466 | name = "rsa w/o comment"; | |
467 | #ifdef DEBUG_PK | |
468 | RSA_print_fp(stderr, prv->rsa, 8); | |
469 | #endif | |
1c14df9e | 470 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
471 | error("key_load_private_pem: RSA_blinding_on failed"); | |
472 | key_free(prv); | |
473 | prv = NULL; | |
474 | } | |
3c0ef626 | 475 | } else if (pk->type == EVP_PKEY_DSA && |
e9a17296 | 476 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
3c0ef626 | 477 | prv = key_new(KEY_UNSPEC); |
478 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
479 | prv->type = KEY_DSA; | |
480 | name = "dsa w/o comment"; | |
481 | #ifdef DEBUG_PK | |
482 | DSA_print_fp(stderr, prv->dsa, 8); | |
483 | #endif | |
484 | } else { | |
485 | error("PEM_read_PrivateKey: mismatch or " | |
486 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
487 | } | |
488 | fclose(fp); | |
489 | if (pk != NULL) | |
490 | EVP_PKEY_free(pk); | |
491 | if (prv != NULL && commentp) | |
492 | *commentp = xstrdup(name); | |
493 | debug("read PEM private key done: type %s", | |
494 | prv ? key_type(prv) : "<unknown>"); | |
495 | return prv; | |
496 | } | |
497 | ||
498 | static int | |
499 | key_perm_ok(int fd, const char *filename) | |
500 | { | |
501 | struct stat st; | |
502 | ||
503 | if (fstat(fd, &st) < 0) | |
504 | return 0; | |
505 | /* | |
506 | * if a key owned by the user is accessed, then we check the | |
507 | * permissions of the file. if the key owned by a different user, | |
508 | * then we don't care. | |
509 | */ | |
510 | #ifdef HAVE_CYGWIN | |
511 | if (check_ntsec(filename)) | |
512 | #endif | |
513 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { | |
514 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
515 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
516 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
517 | error("Permissions 0%3.3o for '%s' are too open.", | |
70791e56 | 518 | (u_int)st.st_mode & 0777, filename); |
3c0ef626 | 519 | error("It is recommended that your private key files are NOT accessible by others."); |
520 | error("This private key will be ignored."); | |
521 | return 0; | |
522 | } | |
523 | return 1; | |
524 | } | |
525 | ||
526 | Key * | |
527 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
528 | char **commentp) | |
529 | { | |
530 | int fd; | |
531 | ||
532 | fd = open(filename, O_RDONLY); | |
533 | if (fd < 0) | |
534 | return NULL; | |
535 | if (!key_perm_ok(fd, filename)) { | |
536 | error("bad permissions: ignore key: %s", filename); | |
537 | close(fd); | |
538 | return NULL; | |
539 | } | |
540 | switch (type) { | |
541 | case KEY_RSA1: | |
542 | return key_load_private_rsa1(fd, filename, passphrase, | |
543 | commentp); | |
544 | /* closes fd */ | |
545 | break; | |
546 | case KEY_DSA: | |
547 | case KEY_RSA: | |
548 | case KEY_UNSPEC: | |
549 | return key_load_private_pem(fd, type, passphrase, commentp); | |
550 | /* closes fd */ | |
551 | break; | |
552 | default: | |
553 | close(fd); | |
554 | break; | |
555 | } | |
556 | return NULL; | |
557 | } | |
558 | ||
559 | Key * | |
560 | key_load_private(const char *filename, const char *passphrase, | |
561 | char **commentp) | |
562 | { | |
563 | Key *pub, *prv; | |
564 | int fd; | |
565 | ||
566 | fd = open(filename, O_RDONLY); | |
567 | if (fd < 0) | |
568 | return NULL; | |
569 | if (!key_perm_ok(fd, filename)) { | |
570 | error("bad permissions: ignore key: %s", filename); | |
571 | close(fd); | |
572 | return NULL; | |
573 | } | |
574 | pub = key_load_public_rsa1(fd, filename, commentp); | |
575 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
576 | if (pub == NULL) { | |
577 | /* closes fd */ | |
578 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); | |
579 | /* use the filename as a comment for PEM */ | |
580 | if (commentp && prv) | |
581 | *commentp = xstrdup(filename); | |
582 | } else { | |
583 | /* it's a SSH v1 key if the public key part is readable */ | |
584 | key_free(pub); | |
585 | /* closes fd */ | |
586 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); | |
587 | } | |
588 | return prv; | |
589 | } | |
590 | ||
591 | static int | |
592 | key_try_load_public(Key *k, const char *filename, char **commentp) | |
593 | { | |
594 | FILE *f; | |
595 | char line[4096]; | |
596 | char *cp; | |
597 | ||
598 | f = fopen(filename, "r"); | |
599 | if (f != NULL) { | |
600 | while (fgets(line, sizeof(line), f)) { | |
601 | line[sizeof(line)-1] = '\0'; | |
602 | cp = line; | |
e9a17296 | 603 | switch (*cp) { |
3c0ef626 | 604 | case '#': |
605 | case '\n': | |
606 | case '\0': | |
607 | continue; | |
608 | } | |
609 | /* Skip leading whitespace. */ | |
610 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
611 | ; | |
612 | if (*cp) { | |
613 | if (key_read(k, &cp) == 1) { | |
614 | if (commentp) | |
615 | *commentp=xstrdup(filename); | |
616 | fclose(f); | |
617 | return 1; | |
618 | } | |
619 | } | |
620 | } | |
621 | fclose(f); | |
622 | } | |
623 | return 0; | |
624 | } | |
625 | ||
626 | /* load public key from ssh v1 private or any pubkey file */ | |
627 | Key * | |
628 | key_load_public(const char *filename, char **commentp) | |
629 | { | |
630 | Key *pub; | |
631 | char file[MAXPATHLEN]; | |
632 | ||
70791e56 | 633 | /* try rsa1 private key */ |
3c0ef626 | 634 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
635 | if (pub != NULL) | |
636 | return pub; | |
70791e56 | 637 | |
638 | /* try rsa1 public key */ | |
639 | pub = key_new(KEY_RSA1); | |
640 | if (key_try_load_public(pub, filename, commentp) == 1) | |
641 | return pub; | |
642 | key_free(pub); | |
643 | ||
644 | /* try ssh2 public key */ | |
3c0ef626 | 645 | pub = key_new(KEY_UNSPEC); |
646 | if (key_try_load_public(pub, filename, commentp) == 1) | |
647 | return pub; | |
648 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
649 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
650 | (key_try_load_public(pub, file, commentp) == 1)) | |
651 | return pub; | |
652 | key_free(pub); | |
653 | return NULL; | |
654 | } |