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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"
665a873d 39RCSID("$OpenBSD: authfile.c,v 1.61 2005/06/17 02:44:32 djm 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"
996d5e62 54#include "misc.h"
665a873d 55#include "atomicio.h"
3c0ef626 56
57/* Version identification string for SSH v1 identity files. */
58static const char authfile_id_string[] =
59 "SSH PRIVATE KEY FILE FORMAT 1.1\n";
60
61/*
62 * Saves the authentication (private) key in a file, encrypting it with
63 * passphrase. The identification of the file (lowest 64 bits of n) will
64 * precede the key to provide identification of the key without needing a
65 * passphrase.
66 */
67
68static int
69key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
70 const char *comment)
71{
72 Buffer buffer, encrypted;
e9a17296 73 u_char buf[100], *cp;
74 int fd, i, cipher_num;
3c0ef626 75 CipherContext ciphercontext;
76 Cipher *cipher;
c9f39d2c 77 u_int32_t rnd;
3c0ef626 78
79 /*
80 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
81 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
82 */
e9a17296 83 cipher_num = (strcmp(passphrase, "") == 0) ?
84 SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
85 if ((cipher = cipher_by_number(cipher_num)) == NULL)
3c0ef626 86 fatal("save_private_key_rsa: bad cipher");
87
88 /* This buffer is used to built the secret part of the private key. */
89 buffer_init(&buffer);
90
91 /* Put checkbytes for checking passphrase validity. */
c9f39d2c 92 rnd = arc4random();
93 buf[0] = rnd & 0xff;
94 buf[1] = (rnd >> 8) & 0xff;
3c0ef626 95 buf[2] = buf[0];
96 buf[3] = buf[1];
97 buffer_append(&buffer, buf, 4);
98
99 /*
100 * Store the private key (n and e will not be stored because they
101 * will be stored in plain text, and storing them also in encrypted
102 * format would just give known plaintext).
103 */
104 buffer_put_bignum(&buffer, key->rsa->d);
105 buffer_put_bignum(&buffer, key->rsa->iqmp);
106 buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
107 buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
108
109 /* Pad the part to be encrypted until its size is a multiple of 8. */
110 while (buffer_len(&buffer) % 8 != 0)
111 buffer_put_char(&buffer, 0);
112
113 /* This buffer will be used to contain the data in the file. */
114 buffer_init(&encrypted);
115
116 /* First store keyfile id string. */
117 for (i = 0; authfile_id_string[i]; i++)
118 buffer_put_char(&encrypted, authfile_id_string[i]);
119 buffer_put_char(&encrypted, 0);
120
121 /* Store cipher type. */
e9a17296 122 buffer_put_char(&encrypted, cipher_num);
3c0ef626 123 buffer_put_int(&encrypted, 0); /* For future extension */
124
125 /* Store public key. This will be in plain text. */
126 buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
127 buffer_put_bignum(&encrypted, key->rsa->n);
128 buffer_put_bignum(&encrypted, key->rsa->e);
129 buffer_put_cstring(&encrypted, comment);
130
131 /* Allocate space for the private part of the key in the buffer. */
e9a17296 132 cp = buffer_append_space(&encrypted, buffer_len(&buffer));
3c0ef626 133
e9a17296 134 cipher_set_key_string(&ciphercontext, cipher, passphrase,
135 CIPHER_ENCRYPT);
136 cipher_crypt(&ciphercontext, cp,
137 buffer_ptr(&buffer), buffer_len(&buffer));
138 cipher_cleanup(&ciphercontext);
3c0ef626 139 memset(&ciphercontext, 0, sizeof(ciphercontext));
140
141 /* Destroy temporary data. */
142 memset(buf, 0, sizeof(buf));
143 buffer_free(&buffer);
144
145 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
146 if (fd < 0) {
147 error("open %s failed: %s.", filename, strerror(errno));
cdd66111 148 buffer_free(&encrypted);
3c0ef626 149 return 0;
150 }
665a873d 151 if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
152 buffer_len(&encrypted)) != buffer_len(&encrypted)) {
3c0ef626 153 error("write to key file %s failed: %s", filename,
e9a17296 154 strerror(errno));
3c0ef626 155 buffer_free(&encrypted);
156 close(fd);
157 unlink(filename);
158 return 0;
159 }
160 close(fd);
161 buffer_free(&encrypted);
162 return 1;
163}
164
165/* save SSH v2 key in OpenSSL PEM format */
166static int
167key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
168 const char *comment)
169{
170 FILE *fp;
171 int fd;
172 int success = 0;
173 int len = strlen(_passphrase);
e9a17296 174 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
175 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
3c0ef626 176
177 if (len > 0 && len <= 4) {
178 error("passphrase too short: have %d bytes, need > 4", len);
179 return 0;
180 }
181 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
182 if (fd < 0) {
183 error("open %s failed: %s.", filename, strerror(errno));
184 return 0;
185 }
186 fp = fdopen(fd, "w");
187 if (fp == NULL ) {
188 error("fdopen %s failed: %s.", filename, strerror(errno));
189 close(fd);
190 return 0;
191 }
192 switch (key->type) {
193 case KEY_DSA:
194 success = PEM_write_DSAPrivateKey(fp, key->dsa,
195 cipher, passphrase, len, NULL, NULL);
196 break;
197 case KEY_RSA:
198 success = PEM_write_RSAPrivateKey(fp, key->rsa,
199 cipher, passphrase, len, NULL, NULL);
200 break;
201 }
202 fclose(fp);
203 return success;
204}
205
206int
207key_save_private(Key *key, const char *filename, const char *passphrase,
208 const char *comment)
209{
210 switch (key->type) {
211 case KEY_RSA1:
212 return key_save_private_rsa1(key, filename, passphrase,
213 comment);
214 break;
215 case KEY_DSA:
216 case KEY_RSA:
217 return key_save_private_pem(key, filename, passphrase,
218 comment);
219 break;
220 default:
221 break;
222 }
223 error("key_save_private: cannot save key type %d", key->type);
224 return 0;
225}
226
227/*
228 * Loads the public part of the ssh v1 key file. Returns NULL if an error was
229 * encountered (the file does not exist or is not readable), and the key
230 * otherwise.
231 */
232
233static Key *
234key_load_public_rsa1(int fd, const char *filename, char **commentp)
235{
236 Buffer buffer;
237 Key *pub;
6a9b3198 238 struct stat st;
3c0ef626 239 char *cp;
665a873d 240 u_int i;
c9f39d2c 241 size_t len;
3c0ef626 242
6a9b3198 243 if (fstat(fd, &st) < 0) {
244 error("fstat for key file %.200s failed: %.100s",
245 filename, strerror(errno));
246 return NULL;
247 }
996d5e62 248 if (st.st_size > 1*1024*1024) {
249 error("key file %.200s too large", filename);
250 return NULL;
251 }
c9f39d2c 252 len = (size_t)st.st_size; /* truncated */
3c0ef626 253
254 buffer_init(&buffer);
e9a17296 255 cp = buffer_append_space(&buffer, len);
3c0ef626 256
665a873d 257 if (atomicio(read, fd, cp, len) != len) {
3c0ef626 258 debug("Read from key file %.200s failed: %.100s", filename,
259 strerror(errno));
260 buffer_free(&buffer);
261 return NULL;
262 }
263
264 /* Check that it is at least big enough to contain the ID string. */
265 if (len < sizeof(authfile_id_string)) {
266 debug3("Not a RSA1 key file %.200s.", filename);
267 buffer_free(&buffer);
268 return NULL;
269 }
270 /*
271 * Make sure it begins with the id string. Consume the id string
272 * from the buffer.
273 */
274 for (i = 0; i < sizeof(authfile_id_string); i++)
275 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
276 debug3("Not a RSA1 key file %.200s.", filename);
277 buffer_free(&buffer);
278 return NULL;
279 }
280 /* Skip cipher type and reserved data. */
281 (void) buffer_get_char(&buffer); /* cipher type */
282 (void) buffer_get_int(&buffer); /* reserved */
283
284 /* Read the public key from the buffer. */
680cee3b 285 (void) buffer_get_int(&buffer);
3c0ef626 286 pub = key_new(KEY_RSA1);
287 buffer_get_bignum(&buffer, pub->rsa->n);
288 buffer_get_bignum(&buffer, pub->rsa->e);
289 if (commentp)
290 *commentp = buffer_get_string(&buffer, NULL);
291 /* The encrypted private part is not parsed by this function. */
292
293 buffer_free(&buffer);
294 return pub;
295}
296
297/* load public key from private-key file, works only for SSH v1 */
298Key *
299key_load_public_type(int type, const char *filename, char **commentp)
300{
301 Key *pub;
302 int fd;
303
304 if (type == KEY_RSA1) {
305 fd = open(filename, O_RDONLY);
306 if (fd < 0)
307 return NULL;
308 pub = key_load_public_rsa1(fd, filename, commentp);
309 close(fd);
310 return pub;
311 }
312 return NULL;
313}
314
315/*
316 * Loads the private key from the file. Returns 0 if an error is encountered
317 * (file does not exist or is not readable, or passphrase is bad). This
318 * initializes the private key.
319 * Assumes we are called under uid of the owner of the file.
320 */
321
322static Key *
323key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
324 char **commentp)
325{
665a873d 326 u_int i;
327 int check1, check2, cipher_type;
c9f39d2c 328 size_t len;
3c0ef626 329 Buffer buffer, decrypted;
e9a17296 330 u_char *cp;
3c0ef626 331 CipherContext ciphercontext;
332 Cipher *cipher;
3c0ef626 333 Key *prv = NULL;
6a9b3198 334 struct stat st;
3c0ef626 335
6a9b3198 336 if (fstat(fd, &st) < 0) {
337 error("fstat for key file %.200s failed: %.100s",
338 filename, strerror(errno));
339 close(fd);
340 return NULL;
341 }
c9f39d2c 342 if (st.st_size > 1*1024*1024) {
996d5e62 343 error("key file %.200s too large", filename);
c9f39d2c 344 close(fd);
345 return (NULL);
346 }
347 len = (size_t)st.st_size; /* truncated */
3c0ef626 348
349 buffer_init(&buffer);
e9a17296 350 cp = buffer_append_space(&buffer, len);
3c0ef626 351
665a873d 352 if (atomicio(read, fd, cp, len) != len) {
3c0ef626 353 debug("Read from key file %.200s failed: %.100s", filename,
354 strerror(errno));
355 buffer_free(&buffer);
356 close(fd);
357 return NULL;
358 }
359
360 /* Check that it is at least big enough to contain the ID string. */
361 if (len < sizeof(authfile_id_string)) {
362 debug3("Not a RSA1 key file %.200s.", filename);
363 buffer_free(&buffer);
364 close(fd);
365 return NULL;
366 }
367 /*
368 * Make sure it begins with the id string. Consume the id string
369 * from the buffer.
370 */
371 for (i = 0; i < sizeof(authfile_id_string); i++)
372 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
373 debug3("Not a RSA1 key file %.200s.", filename);
374 buffer_free(&buffer);
375 close(fd);
376 return NULL;
377 }
378
379 /* Read cipher type. */
380 cipher_type = buffer_get_char(&buffer);
381 (void) buffer_get_int(&buffer); /* Reserved data. */
382
383 /* Read the public key from the buffer. */
680cee3b 384 (void) buffer_get_int(&buffer);
3c0ef626 385 prv = key_new_private(KEY_RSA1);
386
387 buffer_get_bignum(&buffer, prv->rsa->n);
388 buffer_get_bignum(&buffer, prv->rsa->e);
389 if (commentp)
390 *commentp = buffer_get_string(&buffer, NULL);
391 else
392 xfree(buffer_get_string(&buffer, NULL));
393
394 /* Check that it is a supported cipher. */
395 cipher = cipher_by_number(cipher_type);
396 if (cipher == NULL) {
397 debug("Unsupported cipher %d used in key file %.200s.",
398 cipher_type, filename);
399 buffer_free(&buffer);
400 goto fail;
401 }
402 /* Initialize space for decrypted data. */
403 buffer_init(&decrypted);
e9a17296 404 cp = buffer_append_space(&decrypted, buffer_len(&buffer));
3c0ef626 405
406 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
e9a17296 407 cipher_set_key_string(&ciphercontext, cipher, passphrase,
408 CIPHER_DECRYPT);
409 cipher_crypt(&ciphercontext, cp,
410 buffer_ptr(&buffer), buffer_len(&buffer));
411 cipher_cleanup(&ciphercontext);
3c0ef626 412 memset(&ciphercontext, 0, sizeof(ciphercontext));
413 buffer_free(&buffer);
414
415 check1 = buffer_get_char(&decrypted);
416 check2 = buffer_get_char(&decrypted);
417 if (check1 != buffer_get_char(&decrypted) ||
418 check2 != buffer_get_char(&decrypted)) {
419 if (strcmp(passphrase, "") != 0)
420 debug("Bad passphrase supplied for key file %.200s.",
421 filename);
422 /* Bad passphrase. */
423 buffer_free(&decrypted);
424 goto fail;
425 }
426 /* Read the rest of the private key. */
427 buffer_get_bignum(&decrypted, prv->rsa->d);
428 buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
429 /* in SSL and SSH v1 p and q are exchanged */
430 buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
431 buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
432
433 /* calculate p-1 and q-1 */
e9a17296 434 rsa_generate_additional_parameters(prv->rsa);
3c0ef626 435
436 buffer_free(&decrypted);
6a9b3198 437
438 /* enable blinding */
439 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
440 error("key_load_private_rsa1: RSA_blinding_on failed");
441 goto fail;
442 }
3c0ef626 443 close(fd);
444 return prv;
445
446fail:
447 if (commentp)
448 xfree(*commentp);
449 close(fd);
450 key_free(prv);
451 return NULL;
452}
453
f5799ae1 454Key *
3c0ef626 455key_load_private_pem(int fd, int type, const char *passphrase,
456 char **commentp)
457{
458 FILE *fp;
459 EVP_PKEY *pk = NULL;
460 Key *prv = NULL;
461 char *name = "<no key>";
462
463 fp = fdopen(fd, "r");
464 if (fp == NULL) {
465 error("fdopen failed: %s", strerror(errno));
466 close(fd);
467 return NULL;
468 }
469 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
470 if (pk == NULL) {
471 debug("PEM_read_PrivateKey failed");
472 (void)ERR_get_error();
473 } else if (pk->type == EVP_PKEY_RSA &&
e9a17296 474 (type == KEY_UNSPEC||type==KEY_RSA)) {
3c0ef626 475 prv = key_new(KEY_UNSPEC);
476 prv->rsa = EVP_PKEY_get1_RSA(pk);
477 prv->type = KEY_RSA;
478 name = "rsa w/o comment";
479#ifdef DEBUG_PK
480 RSA_print_fp(stderr, prv->rsa, 8);
481#endif
6a9b3198 482 if (RSA_blinding_on(prv->rsa, NULL) != 1) {
483 error("key_load_private_pem: RSA_blinding_on failed");
484 key_free(prv);
485 prv = NULL;
486 }
3c0ef626 487 } else if (pk->type == EVP_PKEY_DSA &&
e9a17296 488 (type == KEY_UNSPEC||type==KEY_DSA)) {
3c0ef626 489 prv = key_new(KEY_UNSPEC);
490 prv->dsa = EVP_PKEY_get1_DSA(pk);
491 prv->type = KEY_DSA;
492 name = "dsa w/o comment";
493#ifdef DEBUG_PK
494 DSA_print_fp(stderr, prv->dsa, 8);
495#endif
496 } else {
497 error("PEM_read_PrivateKey: mismatch or "
498 "unknown EVP_PKEY save_type %d", pk->save_type);
499 }
500 fclose(fp);
501 if (pk != NULL)
502 EVP_PKEY_free(pk);
503 if (prv != NULL && commentp)
504 *commentp = xstrdup(name);
505 debug("read PEM private key done: type %s",
506 prv ? key_type(prv) : "<unknown>");
507 return prv;
508}
509
510static int
511key_perm_ok(int fd, const char *filename)
512{
513 struct stat st;
514
515 if (fstat(fd, &st) < 0)
516 return 0;
517 /*
518 * if a key owned by the user is accessed, then we check the
519 * permissions of the file. if the key owned by a different user,
520 * then we don't care.
521 */
522#ifdef HAVE_CYGWIN
523 if (check_ntsec(filename))
524#endif
525 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
526 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
527 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
528 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
529 error("Permissions 0%3.3o for '%s' are too open.",
0fff78ff 530 (u_int)st.st_mode & 0777, filename);
3c0ef626 531 error("It is recommended that your private key files are NOT accessible by others.");
532 error("This private key will be ignored.");
533 return 0;
534 }
535 return 1;
536}
537
538Key *
539key_load_private_type(int type, const char *filename, const char *passphrase,
540 char **commentp)
541{
542 int fd;
543
544 fd = open(filename, O_RDONLY);
545 if (fd < 0)
546 return NULL;
547 if (!key_perm_ok(fd, filename)) {
548 error("bad permissions: ignore key: %s", filename);
549 close(fd);
550 return NULL;
551 }
552 switch (type) {
553 case KEY_RSA1:
554 return key_load_private_rsa1(fd, filename, passphrase,
555 commentp);
556 /* closes fd */
557 break;
558 case KEY_DSA:
559 case KEY_RSA:
560 case KEY_UNSPEC:
561 return key_load_private_pem(fd, type, passphrase, commentp);
562 /* closes fd */
563 break;
564 default:
565 close(fd);
566 break;
567 }
568 return NULL;
569}
570
571Key *
572key_load_private(const char *filename, const char *passphrase,
573 char **commentp)
574{
575 Key *pub, *prv;
576 int fd;
577
578 fd = open(filename, O_RDONLY);
579 if (fd < 0)
580 return NULL;
581 if (!key_perm_ok(fd, filename)) {
582 error("bad permissions: ignore key: %s", filename);
583 close(fd);
584 return NULL;
585 }
586 pub = key_load_public_rsa1(fd, filename, commentp);
587 lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
588 if (pub == NULL) {
589 /* closes fd */
590 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
591 /* use the filename as a comment for PEM */
592 if (commentp && prv)
593 *commentp = xstrdup(filename);
594 } else {
595 /* it's a SSH v1 key if the public key part is readable */
596 key_free(pub);
597 /* closes fd */
598 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
599 }
600 return prv;
601}
602
603static int
604key_try_load_public(Key *k, const char *filename, char **commentp)
605{
606 FILE *f;
996d5e62 607 char line[SSH_MAX_PUBKEY_BYTES];
3c0ef626 608 char *cp;
996d5e62 609 u_long linenum = 0;
3c0ef626 610
611 f = fopen(filename, "r");
612 if (f != NULL) {
996d5e62 613 while (read_keyfile_line(f, filename, line, sizeof(line),
614 &linenum) != -1) {
3c0ef626 615 cp = line;
e9a17296 616 switch (*cp) {
3c0ef626 617 case '#':
618 case '\n':
619 case '\0':
620 continue;
621 }
622 /* Skip leading whitespace. */
623 for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
624 ;
625 if (*cp) {
626 if (key_read(k, &cp) == 1) {
627 if (commentp)
628 *commentp=xstrdup(filename);
629 fclose(f);
630 return 1;
631 }
632 }
633 }
634 fclose(f);
635 }
636 return 0;
637}
638
639/* load public key from ssh v1 private or any pubkey file */
640Key *
641key_load_public(const char *filename, char **commentp)
642{
643 Key *pub;
644 char file[MAXPATHLEN];
645
0fff78ff 646 /* try rsa1 private key */
3c0ef626 647 pub = key_load_public_type(KEY_RSA1, filename, commentp);
648 if (pub != NULL)
649 return pub;
0fff78ff 650
651 /* try rsa1 public key */
652 pub = key_new(KEY_RSA1);
653 if (key_try_load_public(pub, filename, commentp) == 1)
654 return pub;
655 key_free(pub);
656
657 /* try ssh2 public key */
3c0ef626 658 pub = key_new(KEY_UNSPEC);
659 if (key_try_load_public(pub, filename, commentp) == 1)
660 return pub;
661 if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
662 (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
663 (key_try_load_public(pub, file, commentp) == 1))
664 return pub;
665 key_free(pub);
666 return NULL;
667}
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