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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"
1bd71826 39RCSID("$OpenBSD: authfile.c,v 1.55 2003/09/18 07:56:05 markus Exp $");
8efc0c15 40
fa08c86b 41#include <openssl/err.h>
a306f2dd 42#include <openssl/evp.h>
42f11eb2 43#include <openssl/pem.h>
a306f2dd 44
42f11eb2 45#include "cipher.h"
8efc0c15 46#include "xmalloc.h"
47#include "buffer.h"
48#include "bufaux.h"
a306f2dd 49#include "key.h"
42f11eb2 50#include "ssh.h"
51#include "log.h"
5ca51e19 52#include "authfile.h"
cf184a44 53#include "rsa.h"
8efc0c15 54
aeaa3d9e 55/* Version identification string for SSH v1 identity files. */
7e2183c0 56static const char authfile_id_string[] =
57 "SSH PRIVATE KEY FILE FORMAT 1.1\n";
8efc0c15 58
aa3378df 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 */
8efc0c15 65
396c147e 66static int
aeaa3d9e 67key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
68 const char *comment)
8efc0c15 69{
5260325f 70 Buffer buffer, encrypted;
20905a8e 71 u_char buf[100], *cp;
3ee832e5 72 int fd, i, cipher_num;
94ec8c6b 73 CipherContext ciphercontext;
74 Cipher *cipher;
5260325f 75 u_int32_t rand;
76
aa3378df 77 /*
78 * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
79 * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
80 */
3ee832e5 81 cipher_num = (strcmp(passphrase, "") == 0) ?
82 SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
83 if ((cipher = cipher_by_number(cipher_num)) == NULL)
94ec8c6b 84 fatal("save_private_key_rsa: bad cipher");
5260325f 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
aa3378df 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 */
aeaa3d9e 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 */
5260325f 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. */
7e2183c0 115 for (i = 0; authfile_id_string[i]; i++)
116 buffer_put_char(&encrypted, authfile_id_string[i]);
5260325f 117 buffer_put_char(&encrypted, 0);
118
119 /* Store cipher type. */
3ee832e5 120 buffer_put_char(&encrypted, cipher_num);
5260325f 121 buffer_put_int(&encrypted, 0); /* For future extension */
122
123 /* Store public key. This will be in plain text. */
aeaa3d9e 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);
449c5ba5 127 buffer_put_cstring(&encrypted, comment);
5260325f 128
129 /* Allocate space for the private part of the key in the buffer. */
6c0fa2b1 130 cp = buffer_append_space(&encrypted, buffer_len(&buffer));
5260325f 131
3ee832e5 132 cipher_set_key_string(&ciphercontext, cipher, passphrase,
133 CIPHER_ENCRYPT);
134 cipher_crypt(&ciphercontext, cp,
20905a8e 135 buffer_ptr(&buffer), buffer_len(&buffer));
3ee832e5 136 cipher_cleanup(&ciphercontext);
94ec8c6b 137 memset(&ciphercontext, 0, sizeof(ciphercontext));
5260325f 138
139 /* Destroy temporary data. */
140 memset(buf, 0, sizeof(buf));
141 buffer_free(&buffer);
142
a408af76 143 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
58cfa257 144 if (fd < 0) {
145 error("open %s failed: %s.", filename, strerror(errno));
1bd71826 146 buffer_free(&encrypted);
5260325f 147 return 0;
58cfa257 148 }
a408af76 149 if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
5260325f 150 buffer_len(&encrypted)) {
58cfa257 151 error("write to key file %s failed: %s", filename,
184eed6a 152 strerror(errno));
5260325f 153 buffer_free(&encrypted);
a408af76 154 close(fd);
77bb0bca 155 unlink(filename);
5260325f 156 return 0;
157 }
a408af76 158 close(fd);
5260325f 159 buffer_free(&encrypted);
160 return 1;
8efc0c15 161}
162
aeaa3d9e 163/* save SSH v2 key in OpenSSL PEM format */
396c147e 164static int
aeaa3d9e 165key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
166 const char *comment)
a306f2dd 167{
168 FILE *fp;
169 int fd;
fa08c86b 170 int success = 0;
171 int len = strlen(_passphrase);
c66f9d0e 172 u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
714954dc 173 const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
a306f2dd 174
175 if (len > 0 && len <= 4) {
58cfa257 176 error("passphrase too short: have %d bytes, need > 4", len);
a306f2dd 177 return 0;
178 }
179 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
180 if (fd < 0) {
58cfa257 181 error("open %s failed: %s.", filename, strerror(errno));
a306f2dd 182 return 0;
183 }
184 fp = fdopen(fd, "w");
185 if (fp == NULL ) {
58cfa257 186 error("fdopen %s failed: %s.", filename, strerror(errno));
a306f2dd 187 close(fd);
188 return 0;
189 }
fa08c86b 190 switch (key->type) {
569807fb 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;
a306f2dd 199 }
200 fclose(fp);
201 return success;
202}
203
204int
aeaa3d9e 205key_save_private(Key *key, const char *filename, const char *passphrase,
a306f2dd 206 const char *comment)
207{
208 switch (key->type) {
fa08c86b 209 case KEY_RSA1:
aeaa3d9e 210 return key_save_private_rsa1(key, filename, passphrase,
211 comment);
a306f2dd 212 break;
213 case KEY_DSA:
fa08c86b 214 case KEY_RSA:
aeaa3d9e 215 return key_save_private_pem(key, filename, passphrase,
216 comment);
a306f2dd 217 break;
218 default:
219 break;
220 }
58cfa257 221 error("key_save_private: cannot save key type %d", key->type);
a306f2dd 222 return 0;
223}
224
aa3378df 225/*
aeaa3d9e 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
aa3378df 228 * otherwise.
229 */
8efc0c15 230
396c147e 231static Key *
aeaa3d9e 232key_load_public_rsa1(int fd, const char *filename, char **commentp)
8efc0c15 233{
5260325f 234 Buffer buffer;
aeaa3d9e 235 Key *pub;
378d9956 236 struct stat st;
5260325f 237 char *cp;
aeaa3d9e 238 int i;
239 off_t len;
5260325f 240
378d9956 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;
5260325f 247
248 buffer_init(&buffer);
6c0fa2b1 249 cp = buffer_append_space(&buffer, len);
5260325f 250
a408af76 251 if (read(fd, cp, (size_t) len) != (size_t) len) {
5260325f 252 debug("Read from key file %.200s failed: %.100s", filename,
a306f2dd 253 strerror(errno));
5260325f 254 buffer_free(&buffer);
aeaa3d9e 255 return NULL;
5260325f 256 }
5260325f 257
7e2183c0 258 /* Check that it is at least big enough to contain the ID string. */
259 if (len < sizeof(authfile_id_string)) {
2cdccb44 260 debug3("Not a RSA1 key file %.200s.", filename);
5260325f 261 buffer_free(&buffer);
aeaa3d9e 262 return NULL;
5260325f 263 }
aa3378df 264 /*
265 * Make sure it begins with the id string. Consume the id string
266 * from the buffer.
267 */
7e2183c0 268 for (i = 0; i < sizeof(authfile_id_string); i++)
269 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
2cdccb44 270 debug3("Not a RSA1 key file %.200s.", filename);
5260325f 271 buffer_free(&buffer);
aeaa3d9e 272 return NULL;
5260325f 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. */
1169c3df 279 (void) buffer_get_int(&buffer);
aeaa3d9e 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);
5260325f 285 /* The encrypted private part is not parsed by this function. */
286
8efc0c15 287 buffer_free(&buffer);
aeaa3d9e 288 return pub;
8efc0c15 289}
290
aeaa3d9e 291/* load public key from private-key file, works only for SSH v1 */
292Key *
293key_load_public_type(int type, const char *filename, char **commentp)
a306f2dd 294{
aeaa3d9e 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;
a306f2dd 305 }
aeaa3d9e 306 return NULL;
a306f2dd 307}
308
aa3378df 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 */
8efc0c15 315
396c147e 316static Key *
aeaa3d9e 317key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
318 char **commentp)
8efc0c15 319{
a306f2dd 320 int i, check1, check2, cipher_type;
5260325f 321 off_t len;
322 Buffer buffer, decrypted;
20905a8e 323 u_char *cp;
94ec8c6b 324 CipherContext ciphercontext;
325 Cipher *cipher;
aeaa3d9e 326 Key *prv = NULL;
378d9956 327 struct stat st;
5260325f 328
378d9956 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;
5260325f 336
337 buffer_init(&buffer);
6c0fa2b1 338 cp = buffer_append_space(&buffer, len);
5260325f 339
a408af76 340 if (read(fd, cp, (size_t) len) != (size_t) len) {
5260325f 341 debug("Read from key file %.200s failed: %.100s", filename,
fa08c86b 342 strerror(errno));
5260325f 343 buffer_free(&buffer);
a408af76 344 close(fd);
aeaa3d9e 345 return NULL;
5260325f 346 }
5260325f 347
7e2183c0 348 /* Check that it is at least big enough to contain the ID string. */
349 if (len < sizeof(authfile_id_string)) {
2cdccb44 350 debug3("Not a RSA1 key file %.200s.", filename);
5260325f 351 buffer_free(&buffer);
81333640 352 close(fd);
aeaa3d9e 353 return NULL;
5260325f 354 }
aa3378df 355 /*
356 * Make sure it begins with the id string. Consume the id string
357 * from the buffer.
358 */
7e2183c0 359 for (i = 0; i < sizeof(authfile_id_string); i++)
360 if (buffer_get_char(&buffer) != authfile_id_string[i]) {
2cdccb44 361 debug3("Not a RSA1 key file %.200s.", filename);
5260325f 362 buffer_free(&buffer);
81333640 363 close(fd);
aeaa3d9e 364 return NULL;
5260325f 365 }
81333640 366
5260325f 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. */
1169c3df 372 (void) buffer_get_int(&buffer);
aeaa3d9e 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);
5260325f 379 else
380 xfree(buffer_get_string(&buffer, NULL));
381
382 /* Check that it is a supported cipher. */
94ec8c6b 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);
5260325f 387 buffer_free(&buffer);
388 goto fail;
389 }
390 /* Initialize space for decrypted data. */
391 buffer_init(&decrypted);
6c0fa2b1 392 cp = buffer_append_space(&decrypted, buffer_len(&buffer));
5260325f 393
394 /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
3ee832e5 395 cipher_set_key_string(&ciphercontext, cipher, passphrase,
396 CIPHER_DECRYPT);
397 cipher_crypt(&ciphercontext, cp,
20905a8e 398 buffer_ptr(&buffer), buffer_len(&buffer));
3ee832e5 399 cipher_cleanup(&ciphercontext);
94ec8c6b 400 memset(&ciphercontext, 0, sizeof(ciphercontext));
8efc0c15 401 buffer_free(&buffer);
5260325f 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)
aeaa3d9e 408 debug("Bad passphrase supplied for key file %.200s.",
409 filename);
5260325f 410 /* Bad passphrase. */
411 buffer_free(&decrypted);
aeaa3d9e 412 goto fail;
5260325f 413 }
414 /* Read the rest of the private key. */
aeaa3d9e 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 */
5260325f 420
aeaa3d9e 421 /* calculate p-1 and q-1 */
b775c6f2 422 rsa_generate_additional_parameters(prv->rsa);
5260325f 423
424 buffer_free(&decrypted);
15e98f49 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 }
81333640 431 close(fd);
aeaa3d9e 432 return prv;
433
434fail:
435 if (commentp)
436 xfree(*commentp);
437 close(fd);
438 key_free(prv);
439 return NULL;
8efc0c15 440}
a306f2dd 441
39c00dc2 442Key *
aeaa3d9e 443key_load_private_pem(int fd, int type, const char *passphrase,
444 char **commentp)
a306f2dd 445{
a306f2dd 446 FILE *fp;
fa08c86b 447 EVP_PKEY *pk = NULL;
aeaa3d9e 448 Key *prv = NULL;
fa08c86b 449 char *name = "<no key>";
a306f2dd 450
a306f2dd 451 fp = fdopen(fd, "r");
452 if (fp == NULL) {
58cfa257 453 error("fdopen failed: %s", strerror(errno));
81333640 454 close(fd);
aeaa3d9e 455 return NULL;
a306f2dd 456 }
fa08c86b 457 pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
458 if (pk == NULL) {
ae88ea7e 459 debug("PEM_read_PrivateKey failed");
fa08c86b 460 (void)ERR_get_error();
aeaa3d9e 461 } else if (pk->type == EVP_PKEY_RSA &&
184eed6a 462 (type == KEY_UNSPEC||type==KEY_RSA)) {
aeaa3d9e 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";
fa08c86b 467#ifdef DEBUG_PK
aeaa3d9e 468 RSA_print_fp(stderr, prv->rsa, 8);
fa08c86b 469#endif
15e98f49 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 }
aeaa3d9e 475 } else if (pk->type == EVP_PKEY_DSA &&
184eed6a 476 (type == KEY_UNSPEC||type==KEY_DSA)) {
aeaa3d9e 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";
fa08c86b 481#ifdef DEBUG_PK
aeaa3d9e 482 DSA_print_fp(stderr, prv->dsa, 8);
fa08c86b 483#endif
fa08c86b 484 } else {
485 error("PEM_read_PrivateKey: mismatch or "
486 "unknown EVP_PKEY save_type %d", pk->save_type);
a306f2dd 487 }
a306f2dd 488 fclose(fp);
fa08c86b 489 if (pk != NULL)
490 EVP_PKEY_free(pk);
aeaa3d9e 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;
a306f2dd 496}
497
396c147e 498static int
aeaa3d9e 499key_perm_ok(int fd, const char *filename)
a306f2dd 500{
a306f2dd 501 struct stat st;
502
d842a5eb 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 */
9cd45ea4 510#ifdef HAVE_CYGWIN
22d89d24 511 if (check_ntsec(filename))
9cd45ea4 512#endif
d842a5eb 513 if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
a306f2dd 514 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
515 error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
516 error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
d842a5eb 517 error("Permissions 0%3.3o for '%s' are too open.",
b9ed513a 518 (u_int)st.st_mode & 0777, filename);
a306f2dd 519 error("It is recommended that your private key files are NOT accessible by others.");
aeaa3d9e 520 error("This private key will be ignored.");
a306f2dd 521 return 0;
522 }
aeaa3d9e 523 return 1;
524}
81333640 525
aeaa3d9e 526Key *
527key_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)) {
58cfa257 536 error("bad permissions: ignore key: %s", filename);
aeaa3d9e 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 */
a306f2dd 545 break;
546 case KEY_DSA:
fa08c86b 547 case KEY_RSA:
548 case KEY_UNSPEC:
aeaa3d9e 549 return key_load_private_pem(fd, type, passphrase, commentp);
550 /* closes fd */
81333640 551 break;
a306f2dd 552 default:
81333640 553 close(fd);
a306f2dd 554 break;
555 }
aeaa3d9e 556 return NULL;
557}
558
559Key *
560key_load_private(const char *filename, const char *passphrase,
561 char **commentp)
562{
eb2e1595 563 Key *pub, *prv;
aeaa3d9e 564 int fd;
565
566 fd = open(filename, O_RDONLY);
567 if (fd < 0)
568 return NULL;
569 if (!key_perm_ok(fd, filename)) {
58cfa257 570 error("bad permissions: ignore key: %s", filename);
aeaa3d9e 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 */
eb2e1595 578 prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
579 /* use the filename as a comment for PEM */
580 if (commentp && prv)
a10bdd7c 581 *commentp = xstrdup(filename);
aeaa3d9e 582 } else {
583 /* it's a SSH v1 key if the public key part is readable */
584 key_free(pub);
585 /* closes fd */
eb2e1595 586 prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
aeaa3d9e 587 }
eb2e1595 588 return prv;
a306f2dd 589}
bcbf86ec 590
396c147e 591static int
aeaa3d9e 592key_try_load_public(Key *k, const char *filename, char **commentp)
bcbf86ec 593{
594 FILE *f;
aeaa3d9e 595 char line[4096];
bcbf86ec 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;
6aacefa7 603 switch (*cp) {
bcbf86ec 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) {
fa08c86b 613 if (key_read(k, &cp) == 1) {
bcbf86ec 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
aeaa3d9e 626/* load public key from ssh v1 private or any pubkey file */
627Key *
628key_load_public(const char *filename, char **commentp)
bcbf86ec 629{
aeaa3d9e 630 Key *pub;
631 char file[MAXPATHLEN];
632
3566c73c 633 /* try rsa1 private key */
aeaa3d9e 634 pub = key_load_public_type(KEY_RSA1, filename, commentp);
635 if (pub != NULL)
636 return pub;
3566c73c 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 */
aeaa3d9e 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;
bcbf86ec 654}
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