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dd984467 | 1 | /* $OpenBSD: authfile.c,v 1.69 2006/07/11 20:27:56 stevesk Exp $ */ |
8efc0c15 | 2 | /* |
5260325f | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
5260325f | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
5 | * All rights reserved | |
5260325f | 6 | * This file contains functions for reading and writing identity files, and |
7 | * for reading the passphrase from the user. | |
6ae2364d | 8 | * |
bcbf86ec | 9 | * As far as I am concerned, the code I have written for this software |
10 | * can be used freely for any purpose. Any derived versions of this | |
11 | * software must be clearly marked as such, and if the derived work is | |
12 | * incompatible with the protocol description in the RFC file, it must be | |
13 | * called by a name other than "ssh" or "Secure Shell". | |
14 | * | |
15 | * | |
16 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
17 | * | |
18 | * Redistribution and use in source and binary forms, with or without | |
19 | * modification, are permitted provided that the following conditions | |
20 | * are met: | |
21 | * 1. Redistributions of source code must retain the above copyright | |
22 | * notice, this list of conditions and the following disclaimer. | |
23 | * 2. Redistributions in binary form must reproduce the above copyright | |
24 | * notice, this list of conditions and the following disclaimer in the | |
25 | * documentation and/or other materials provided with the distribution. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
28 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
29 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
30 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
31 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
32 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
33 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
34 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
35 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
36 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 37 | */ |
8efc0c15 | 38 | |
39 | #include "includes.h" | |
4095f623 | 40 | |
41 | #include <sys/types.h> | |
42 | #include <sys/stat.h> | |
8efc0c15 | 43 | |
fa08c86b | 44 | #include <openssl/err.h> |
a306f2dd | 45 | #include <openssl/evp.h> |
42f11eb2 | 46 | #include <openssl/pem.h> |
a306f2dd | 47 | |
dd984467 | 48 | #include <errno.h> |
d3221cca | 49 | #include <fcntl.h> |
50 | ||
42f11eb2 | 51 | #include "cipher.h" |
8efc0c15 | 52 | #include "xmalloc.h" |
53 | #include "buffer.h" | |
54 | #include "bufaux.h" | |
a306f2dd | 55 | #include "key.h" |
42f11eb2 | 56 | #include "ssh.h" |
57 | #include "log.h" | |
5ca51e19 | 58 | #include "authfile.h" |
cf184a44 | 59 | #include "rsa.h" |
41feb690 | 60 | #include "misc.h" |
2ceb8101 | 61 | #include "atomicio.h" |
8efc0c15 | 62 | |
aeaa3d9e | 63 | /* Version identification string for SSH v1 identity files. */ |
7e2183c0 | 64 | static const char authfile_id_string[] = |
65 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; | |
8efc0c15 | 66 | |
aa3378df | 67 | /* |
68 | * Saves the authentication (private) key in a file, encrypting it with | |
69 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
70 | * precede the key to provide identification of the key without needing a | |
71 | * passphrase. | |
72 | */ | |
8efc0c15 | 73 | |
396c147e | 74 | static int |
aeaa3d9e | 75 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
76 | const char *comment) | |
8efc0c15 | 77 | { |
5260325f | 78 | Buffer buffer, encrypted; |
20905a8e | 79 | u_char buf[100], *cp; |
3ee832e5 | 80 | int fd, i, cipher_num; |
94ec8c6b | 81 | CipherContext ciphercontext; |
82 | Cipher *cipher; | |
ca75d7de | 83 | u_int32_t rnd; |
5260325f | 84 | |
aa3378df | 85 | /* |
86 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
87 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
88 | */ | |
3ee832e5 | 89 | cipher_num = (strcmp(passphrase, "") == 0) ? |
90 | SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; | |
91 | if ((cipher = cipher_by_number(cipher_num)) == NULL) | |
94ec8c6b | 92 | fatal("save_private_key_rsa: bad cipher"); |
5260325f | 93 | |
94 | /* This buffer is used to built the secret part of the private key. */ | |
95 | buffer_init(&buffer); | |
96 | ||
97 | /* Put checkbytes for checking passphrase validity. */ | |
ca75d7de | 98 | rnd = arc4random(); |
99 | buf[0] = rnd & 0xff; | |
100 | buf[1] = (rnd >> 8) & 0xff; | |
5260325f | 101 | buf[2] = buf[0]; |
102 | buf[3] = buf[1]; | |
103 | buffer_append(&buffer, buf, 4); | |
104 | ||
aa3378df | 105 | /* |
106 | * Store the private key (n and e will not be stored because they | |
107 | * will be stored in plain text, and storing them also in encrypted | |
108 | * format would just give known plaintext). | |
109 | */ | |
aeaa3d9e | 110 | buffer_put_bignum(&buffer, key->rsa->d); |
111 | buffer_put_bignum(&buffer, key->rsa->iqmp); | |
112 | buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ | |
113 | buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ | |
5260325f | 114 | |
115 | /* Pad the part to be encrypted until its size is a multiple of 8. */ | |
116 | while (buffer_len(&buffer) % 8 != 0) | |
117 | buffer_put_char(&buffer, 0); | |
118 | ||
119 | /* This buffer will be used to contain the data in the file. */ | |
120 | buffer_init(&encrypted); | |
121 | ||
122 | /* First store keyfile id string. */ | |
7e2183c0 | 123 | for (i = 0; authfile_id_string[i]; i++) |
124 | buffer_put_char(&encrypted, authfile_id_string[i]); | |
5260325f | 125 | buffer_put_char(&encrypted, 0); |
126 | ||
127 | /* Store cipher type. */ | |
3ee832e5 | 128 | buffer_put_char(&encrypted, cipher_num); |
5260325f | 129 | buffer_put_int(&encrypted, 0); /* For future extension */ |
130 | ||
131 | /* Store public key. This will be in plain text. */ | |
aeaa3d9e | 132 | buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); |
133 | buffer_put_bignum(&encrypted, key->rsa->n); | |
134 | buffer_put_bignum(&encrypted, key->rsa->e); | |
449c5ba5 | 135 | buffer_put_cstring(&encrypted, comment); |
5260325f | 136 | |
137 | /* Allocate space for the private part of the key in the buffer. */ | |
6c0fa2b1 | 138 | cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
5260325f | 139 | |
3ee832e5 | 140 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
141 | CIPHER_ENCRYPT); | |
142 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 143 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 144 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 145 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
5260325f | 146 | |
147 | /* Destroy temporary data. */ | |
148 | memset(buf, 0, sizeof(buf)); | |
149 | buffer_free(&buffer); | |
150 | ||
a408af76 | 151 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
58cfa257 | 152 | if (fd < 0) { |
153 | error("open %s failed: %s.", filename, strerror(errno)); | |
1bd71826 | 154 | buffer_free(&encrypted); |
5260325f | 155 | return 0; |
58cfa257 | 156 | } |
2ceb8101 | 157 | if (atomicio(vwrite, fd, buffer_ptr(&encrypted), |
158 | buffer_len(&encrypted)) != buffer_len(&encrypted)) { | |
58cfa257 | 159 | error("write to key file %s failed: %s", filename, |
184eed6a | 160 | strerror(errno)); |
5260325f | 161 | buffer_free(&encrypted); |
a408af76 | 162 | close(fd); |
77bb0bca | 163 | unlink(filename); |
5260325f | 164 | return 0; |
165 | } | |
a408af76 | 166 | close(fd); |
5260325f | 167 | buffer_free(&encrypted); |
168 | return 1; | |
8efc0c15 | 169 | } |
170 | ||
aeaa3d9e | 171 | /* save SSH v2 key in OpenSSL PEM format */ |
396c147e | 172 | static int |
aeaa3d9e | 173 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
174 | const char *comment) | |
a306f2dd | 175 | { |
176 | FILE *fp; | |
177 | int fd; | |
fa08c86b | 178 | int success = 0; |
179 | int len = strlen(_passphrase); | |
c66f9d0e | 180 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
714954dc | 181 | const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
a306f2dd | 182 | |
183 | if (len > 0 && len <= 4) { | |
58cfa257 | 184 | error("passphrase too short: have %d bytes, need > 4", len); |
a306f2dd | 185 | return 0; |
186 | } | |
187 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
188 | if (fd < 0) { | |
58cfa257 | 189 | error("open %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 190 | return 0; |
191 | } | |
192 | fp = fdopen(fd, "w"); | |
193 | if (fp == NULL ) { | |
58cfa257 | 194 | error("fdopen %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 195 | close(fd); |
196 | return 0; | |
197 | } | |
fa08c86b | 198 | switch (key->type) { |
569807fb | 199 | case KEY_DSA: |
200 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
201 | cipher, passphrase, len, NULL, NULL); | |
202 | break; | |
203 | case KEY_RSA: | |
204 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
205 | cipher, passphrase, len, NULL, NULL); | |
206 | break; | |
a306f2dd | 207 | } |
208 | fclose(fp); | |
209 | return success; | |
210 | } | |
211 | ||
212 | int | |
aeaa3d9e | 213 | key_save_private(Key *key, const char *filename, const char *passphrase, |
a306f2dd | 214 | const char *comment) |
215 | { | |
216 | switch (key->type) { | |
fa08c86b | 217 | case KEY_RSA1: |
aeaa3d9e | 218 | return key_save_private_rsa1(key, filename, passphrase, |
219 | comment); | |
a306f2dd | 220 | case KEY_DSA: |
fa08c86b | 221 | case KEY_RSA: |
aeaa3d9e | 222 | return key_save_private_pem(key, filename, passphrase, |
223 | comment); | |
a306f2dd | 224 | default: |
225 | break; | |
226 | } | |
58cfa257 | 227 | error("key_save_private: cannot save key type %d", key->type); |
a306f2dd | 228 | return 0; |
229 | } | |
230 | ||
aa3378df | 231 | /* |
aeaa3d9e | 232 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
233 | * encountered (the file does not exist or is not readable), and the key | |
aa3378df | 234 | * otherwise. |
235 | */ | |
8efc0c15 | 236 | |
396c147e | 237 | static Key * |
aeaa3d9e | 238 | key_load_public_rsa1(int fd, const char *filename, char **commentp) |
8efc0c15 | 239 | { |
5260325f | 240 | Buffer buffer; |
aeaa3d9e | 241 | Key *pub; |
378d9956 | 242 | struct stat st; |
5260325f | 243 | char *cp; |
2ceb8101 | 244 | u_int i; |
f6be21a0 | 245 | size_t len; |
5260325f | 246 | |
378d9956 | 247 | if (fstat(fd, &st) < 0) { |
248 | error("fstat for key file %.200s failed: %.100s", | |
249 | filename, strerror(errno)); | |
250 | return NULL; | |
251 | } | |
528afafa | 252 | if (st.st_size > 1*1024*1024) { |
253 | error("key file %.200s too large", filename); | |
254 | return NULL; | |
255 | } | |
f6be21a0 | 256 | len = (size_t)st.st_size; /* truncated */ |
5260325f | 257 | |
258 | buffer_init(&buffer); | |
6c0fa2b1 | 259 | cp = buffer_append_space(&buffer, len); |
5260325f | 260 | |
2ceb8101 | 261 | if (atomicio(read, fd, cp, len) != len) { |
5260325f | 262 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 263 | strerror(errno)); |
5260325f | 264 | buffer_free(&buffer); |
aeaa3d9e | 265 | return NULL; |
5260325f | 266 | } |
5260325f | 267 | |
7e2183c0 | 268 | /* Check that it is at least big enough to contain the ID string. */ |
269 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 270 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 271 | buffer_free(&buffer); |
aeaa3d9e | 272 | return NULL; |
5260325f | 273 | } |
aa3378df | 274 | /* |
275 | * Make sure it begins with the id string. Consume the id string | |
276 | * from the buffer. | |
277 | */ | |
7e2183c0 | 278 | for (i = 0; i < sizeof(authfile_id_string); i++) |
279 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 280 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 281 | buffer_free(&buffer); |
aeaa3d9e | 282 | return NULL; |
5260325f | 283 | } |
284 | /* Skip cipher type and reserved data. */ | |
285 | (void) buffer_get_char(&buffer); /* cipher type */ | |
286 | (void) buffer_get_int(&buffer); /* reserved */ | |
287 | ||
288 | /* Read the public key from the buffer. */ | |
1169c3df | 289 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 290 | pub = key_new(KEY_RSA1); |
291 | buffer_get_bignum(&buffer, pub->rsa->n); | |
292 | buffer_get_bignum(&buffer, pub->rsa->e); | |
293 | if (commentp) | |
294 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 295 | /* The encrypted private part is not parsed by this function. */ |
296 | ||
8efc0c15 | 297 | buffer_free(&buffer); |
aeaa3d9e | 298 | return pub; |
8efc0c15 | 299 | } |
300 | ||
aeaa3d9e | 301 | /* load public key from private-key file, works only for SSH v1 */ |
302 | Key * | |
303 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 304 | { |
aeaa3d9e | 305 | Key *pub; |
306 | int fd; | |
307 | ||
308 | if (type == KEY_RSA1) { | |
309 | fd = open(filename, O_RDONLY); | |
310 | if (fd < 0) | |
311 | return NULL; | |
312 | pub = key_load_public_rsa1(fd, filename, commentp); | |
313 | close(fd); | |
314 | return pub; | |
a306f2dd | 315 | } |
aeaa3d9e | 316 | return NULL; |
a306f2dd | 317 | } |
318 | ||
aa3378df | 319 | /* |
320 | * Loads the private key from the file. Returns 0 if an error is encountered | |
321 | * (file does not exist or is not readable, or passphrase is bad). This | |
322 | * initializes the private key. | |
323 | * Assumes we are called under uid of the owner of the file. | |
324 | */ | |
8efc0c15 | 325 | |
396c147e | 326 | static Key * |
aeaa3d9e | 327 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
328 | char **commentp) | |
8efc0c15 | 329 | { |
2ceb8101 | 330 | u_int i; |
331 | int check1, check2, cipher_type; | |
f6be21a0 | 332 | size_t len; |
5260325f | 333 | Buffer buffer, decrypted; |
20905a8e | 334 | u_char *cp; |
94ec8c6b | 335 | CipherContext ciphercontext; |
336 | Cipher *cipher; | |
aeaa3d9e | 337 | Key *prv = NULL; |
378d9956 | 338 | struct stat st; |
5260325f | 339 | |
378d9956 | 340 | if (fstat(fd, &st) < 0) { |
341 | error("fstat for key file %.200s failed: %.100s", | |
342 | filename, strerror(errno)); | |
343 | close(fd); | |
344 | return NULL; | |
345 | } | |
f6be21a0 | 346 | if (st.st_size > 1*1024*1024) { |
528afafa | 347 | error("key file %.200s too large", filename); |
f6be21a0 | 348 | close(fd); |
349 | return (NULL); | |
350 | } | |
351 | len = (size_t)st.st_size; /* truncated */ | |
5260325f | 352 | |
353 | buffer_init(&buffer); | |
6c0fa2b1 | 354 | cp = buffer_append_space(&buffer, len); |
5260325f | 355 | |
2ceb8101 | 356 | if (atomicio(read, fd, cp, len) != len) { |
5260325f | 357 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 358 | strerror(errno)); |
5260325f | 359 | buffer_free(&buffer); |
a408af76 | 360 | close(fd); |
aeaa3d9e | 361 | return NULL; |
5260325f | 362 | } |
5260325f | 363 | |
7e2183c0 | 364 | /* Check that it is at least big enough to contain the ID string. */ |
365 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 366 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 367 | buffer_free(&buffer); |
81333640 | 368 | close(fd); |
aeaa3d9e | 369 | return NULL; |
5260325f | 370 | } |
aa3378df | 371 | /* |
372 | * Make sure it begins with the id string. Consume the id string | |
373 | * from the buffer. | |
374 | */ | |
7e2183c0 | 375 | for (i = 0; i < sizeof(authfile_id_string); i++) |
376 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 377 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 378 | buffer_free(&buffer); |
81333640 | 379 | close(fd); |
aeaa3d9e | 380 | return NULL; |
5260325f | 381 | } |
81333640 | 382 | |
5260325f | 383 | /* Read cipher type. */ |
384 | cipher_type = buffer_get_char(&buffer); | |
385 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
386 | ||
387 | /* Read the public key from the buffer. */ | |
1169c3df | 388 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 389 | prv = key_new_private(KEY_RSA1); |
390 | ||
391 | buffer_get_bignum(&buffer, prv->rsa->n); | |
392 | buffer_get_bignum(&buffer, prv->rsa->e); | |
393 | if (commentp) | |
394 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 395 | else |
396 | xfree(buffer_get_string(&buffer, NULL)); | |
397 | ||
398 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 399 | cipher = cipher_by_number(cipher_type); |
400 | if (cipher == NULL) { | |
401 | debug("Unsupported cipher %d used in key file %.200s.", | |
402 | cipher_type, filename); | |
5260325f | 403 | buffer_free(&buffer); |
404 | goto fail; | |
405 | } | |
406 | /* Initialize space for decrypted data. */ | |
407 | buffer_init(&decrypted); | |
6c0fa2b1 | 408 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
5260325f | 409 | |
410 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
3ee832e5 | 411 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
412 | CIPHER_DECRYPT); | |
413 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 414 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 415 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 416 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 417 | buffer_free(&buffer); |
5260325f | 418 | |
419 | check1 = buffer_get_char(&decrypted); | |
420 | check2 = buffer_get_char(&decrypted); | |
421 | if (check1 != buffer_get_char(&decrypted) || | |
422 | check2 != buffer_get_char(&decrypted)) { | |
423 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 424 | debug("Bad passphrase supplied for key file %.200s.", |
425 | filename); | |
5260325f | 426 | /* Bad passphrase. */ |
427 | buffer_free(&decrypted); | |
aeaa3d9e | 428 | goto fail; |
5260325f | 429 | } |
430 | /* Read the rest of the private key. */ | |
aeaa3d9e | 431 | buffer_get_bignum(&decrypted, prv->rsa->d); |
432 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
433 | /* in SSL and SSH v1 p and q are exchanged */ | |
434 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
435 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 436 | |
aeaa3d9e | 437 | /* calculate p-1 and q-1 */ |
b775c6f2 | 438 | rsa_generate_additional_parameters(prv->rsa); |
5260325f | 439 | |
440 | buffer_free(&decrypted); | |
15e98f49 | 441 | |
442 | /* enable blinding */ | |
443 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { | |
444 | error("key_load_private_rsa1: RSA_blinding_on failed"); | |
445 | goto fail; | |
446 | } | |
81333640 | 447 | close(fd); |
aeaa3d9e | 448 | return prv; |
449 | ||
450 | fail: | |
451 | if (commentp) | |
452 | xfree(*commentp); | |
453 | close(fd); | |
454 | key_free(prv); | |
455 | return NULL; | |
8efc0c15 | 456 | } |
a306f2dd | 457 | |
39c00dc2 | 458 | Key * |
aeaa3d9e | 459 | key_load_private_pem(int fd, int type, const char *passphrase, |
460 | char **commentp) | |
a306f2dd | 461 | { |
a306f2dd | 462 | FILE *fp; |
fa08c86b | 463 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 464 | Key *prv = NULL; |
fa08c86b | 465 | char *name = "<no key>"; |
a306f2dd | 466 | |
a306f2dd | 467 | fp = fdopen(fd, "r"); |
468 | if (fp == NULL) { | |
58cfa257 | 469 | error("fdopen failed: %s", strerror(errno)); |
81333640 | 470 | close(fd); |
aeaa3d9e | 471 | return NULL; |
a306f2dd | 472 | } |
fa08c86b | 473 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
474 | if (pk == NULL) { | |
ae88ea7e | 475 | debug("PEM_read_PrivateKey failed"); |
fa08c86b | 476 | (void)ERR_get_error(); |
aeaa3d9e | 477 | } else if (pk->type == EVP_PKEY_RSA && |
184eed6a | 478 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
aeaa3d9e | 479 | prv = key_new(KEY_UNSPEC); |
480 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
481 | prv->type = KEY_RSA; | |
482 | name = "rsa w/o comment"; | |
fa08c86b | 483 | #ifdef DEBUG_PK |
aeaa3d9e | 484 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 485 | #endif |
15e98f49 | 486 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
487 | error("key_load_private_pem: RSA_blinding_on failed"); | |
488 | key_free(prv); | |
489 | prv = NULL; | |
490 | } | |
aeaa3d9e | 491 | } else if (pk->type == EVP_PKEY_DSA && |
184eed6a | 492 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
aeaa3d9e | 493 | prv = key_new(KEY_UNSPEC); |
494 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
495 | prv->type = KEY_DSA; | |
496 | name = "dsa w/o comment"; | |
fa08c86b | 497 | #ifdef DEBUG_PK |
aeaa3d9e | 498 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 499 | #endif |
fa08c86b | 500 | } else { |
501 | error("PEM_read_PrivateKey: mismatch or " | |
502 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 503 | } |
a306f2dd | 504 | fclose(fp); |
fa08c86b | 505 | if (pk != NULL) |
506 | EVP_PKEY_free(pk); | |
aeaa3d9e | 507 | if (prv != NULL && commentp) |
508 | *commentp = xstrdup(name); | |
509 | debug("read PEM private key done: type %s", | |
510 | prv ? key_type(prv) : "<unknown>"); | |
511 | return prv; | |
a306f2dd | 512 | } |
513 | ||
45660a22 | 514 | int |
aeaa3d9e | 515 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 516 | { |
a306f2dd | 517 | struct stat st; |
518 | ||
d842a5eb | 519 | if (fstat(fd, &st) < 0) |
520 | return 0; | |
521 | /* | |
522 | * if a key owned by the user is accessed, then we check the | |
523 | * permissions of the file. if the key owned by a different user, | |
524 | * then we don't care. | |
525 | */ | |
9cd45ea4 | 526 | #ifdef HAVE_CYGWIN |
22d89d24 | 527 | if (check_ntsec(filename)) |
9cd45ea4 | 528 | #endif |
d842a5eb | 529 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
a306f2dd | 530 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
531 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
532 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
d842a5eb | 533 | error("Permissions 0%3.3o for '%s' are too open.", |
b9ed513a | 534 | (u_int)st.st_mode & 0777, filename); |
a306f2dd | 535 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 536 | error("This private key will be ignored."); |
a306f2dd | 537 | return 0; |
538 | } | |
aeaa3d9e | 539 | return 1; |
540 | } | |
81333640 | 541 | |
aeaa3d9e | 542 | Key * |
543 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
fc231518 | 544 | char **commentp, int *perm_ok) |
aeaa3d9e | 545 | { |
546 | int fd; | |
547 | ||
548 | fd = open(filename, O_RDONLY); | |
549 | if (fd < 0) | |
550 | return NULL; | |
551 | if (!key_perm_ok(fd, filename)) { | |
fc231518 | 552 | if (perm_ok != NULL) |
553 | *perm_ok = 0; | |
58cfa257 | 554 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 555 | close(fd); |
556 | return NULL; | |
557 | } | |
fc231518 | 558 | if (perm_ok != NULL) |
559 | *perm_ok = 1; | |
aeaa3d9e | 560 | switch (type) { |
561 | case KEY_RSA1: | |
562 | return key_load_private_rsa1(fd, filename, passphrase, | |
563 | commentp); | |
564 | /* closes fd */ | |
a306f2dd | 565 | case KEY_DSA: |
fa08c86b | 566 | case KEY_RSA: |
567 | case KEY_UNSPEC: | |
aeaa3d9e | 568 | return key_load_private_pem(fd, type, passphrase, commentp); |
569 | /* closes fd */ | |
a306f2dd | 570 | default: |
81333640 | 571 | close(fd); |
a306f2dd | 572 | break; |
573 | } | |
aeaa3d9e | 574 | return NULL; |
575 | } | |
576 | ||
577 | Key * | |
578 | key_load_private(const char *filename, const char *passphrase, | |
579 | char **commentp) | |
580 | { | |
eb2e1595 | 581 | Key *pub, *prv; |
aeaa3d9e | 582 | int fd; |
583 | ||
584 | fd = open(filename, O_RDONLY); | |
585 | if (fd < 0) | |
586 | return NULL; | |
587 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 588 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 589 | close(fd); |
590 | return NULL; | |
591 | } | |
592 | pub = key_load_public_rsa1(fd, filename, commentp); | |
593 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
594 | if (pub == NULL) { | |
595 | /* closes fd */ | |
eb2e1595 | 596 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
597 | /* use the filename as a comment for PEM */ | |
598 | if (commentp && prv) | |
a10bdd7c | 599 | *commentp = xstrdup(filename); |
aeaa3d9e | 600 | } else { |
601 | /* it's a SSH v1 key if the public key part is readable */ | |
602 | key_free(pub); | |
603 | /* closes fd */ | |
eb2e1595 | 604 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
aeaa3d9e | 605 | } |
eb2e1595 | 606 | return prv; |
a306f2dd | 607 | } |
bcbf86ec | 608 | |
396c147e | 609 | static int |
aeaa3d9e | 610 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 611 | { |
612 | FILE *f; | |
ea067773 | 613 | char line[SSH_MAX_PUBKEY_BYTES]; |
bcbf86ec | 614 | char *cp; |
41feb690 | 615 | u_long linenum = 0; |
bcbf86ec | 616 | |
617 | f = fopen(filename, "r"); | |
618 | if (f != NULL) { | |
ea067773 | 619 | while (read_keyfile_line(f, filename, line, sizeof(line), |
620 | &linenum) != -1) { | |
bcbf86ec | 621 | cp = line; |
6aacefa7 | 622 | switch (*cp) { |
bcbf86ec | 623 | case '#': |
624 | case '\n': | |
625 | case '\0': | |
626 | continue; | |
627 | } | |
628 | /* Skip leading whitespace. */ | |
629 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
630 | ; | |
631 | if (*cp) { | |
fa08c86b | 632 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 633 | if (commentp) |
634 | *commentp=xstrdup(filename); | |
635 | fclose(f); | |
636 | return 1; | |
637 | } | |
638 | } | |
639 | } | |
640 | fclose(f); | |
641 | } | |
642 | return 0; | |
643 | } | |
644 | ||
aeaa3d9e | 645 | /* load public key from ssh v1 private or any pubkey file */ |
646 | Key * | |
647 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 648 | { |
aeaa3d9e | 649 | Key *pub; |
650 | char file[MAXPATHLEN]; | |
651 | ||
3566c73c | 652 | /* try rsa1 private key */ |
aeaa3d9e | 653 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
654 | if (pub != NULL) | |
655 | return pub; | |
3566c73c | 656 | |
657 | /* try rsa1 public key */ | |
658 | pub = key_new(KEY_RSA1); | |
659 | if (key_try_load_public(pub, filename, commentp) == 1) | |
660 | return pub; | |
661 | key_free(pub); | |
662 | ||
663 | /* try ssh2 public key */ | |
aeaa3d9e | 664 | pub = key_new(KEY_UNSPEC); |
665 | if (key_try_load_public(pub, filename, commentp) == 1) | |
666 | return pub; | |
667 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
668 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
669 | (key_try_load_public(pub, file, commentp) == 1)) | |
670 | return pub; | |
671 | key_free(pub); | |
672 | return NULL; | |
bcbf86ec | 673 | } |