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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" | |
41feb690 | 39 | RCSID("$OpenBSD: authfile.c,v 1.60 2004/12/11 01:48:56 dtucker 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" |
41feb690 | 54 | #include "misc.h" |
8efc0c15 | 55 | |
aeaa3d9e | 56 | /* Version identification string for SSH v1 identity files. */ |
7e2183c0 | 57 | static const char authfile_id_string[] = |
58 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; | |
8efc0c15 | 59 | |
aa3378df | 60 | /* |
61 | * Saves the authentication (private) key in a file, encrypting it with | |
62 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
63 | * precede the key to provide identification of the key without needing a | |
64 | * passphrase. | |
65 | */ | |
8efc0c15 | 66 | |
396c147e | 67 | static int |
aeaa3d9e | 68 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
69 | const char *comment) | |
8efc0c15 | 70 | { |
5260325f | 71 | Buffer buffer, encrypted; |
20905a8e | 72 | u_char buf[100], *cp; |
3ee832e5 | 73 | int fd, i, cipher_num; |
94ec8c6b | 74 | CipherContext ciphercontext; |
75 | Cipher *cipher; | |
ca75d7de | 76 | u_int32_t rnd; |
5260325f | 77 | |
aa3378df | 78 | /* |
79 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
80 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
81 | */ | |
3ee832e5 | 82 | cipher_num = (strcmp(passphrase, "") == 0) ? |
83 | SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; | |
84 | if ((cipher = cipher_by_number(cipher_num)) == NULL) | |
94ec8c6b | 85 | fatal("save_private_key_rsa: bad cipher"); |
5260325f | 86 | |
87 | /* This buffer is used to built the secret part of the private key. */ | |
88 | buffer_init(&buffer); | |
89 | ||
90 | /* Put checkbytes for checking passphrase validity. */ | |
ca75d7de | 91 | rnd = arc4random(); |
92 | buf[0] = rnd & 0xff; | |
93 | buf[1] = (rnd >> 8) & 0xff; | |
5260325f | 94 | buf[2] = buf[0]; |
95 | buf[3] = buf[1]; | |
96 | buffer_append(&buffer, buf, 4); | |
97 | ||
aa3378df | 98 | /* |
99 | * Store the private key (n and e will not be stored because they | |
100 | * will be stored in plain text, and storing them also in encrypted | |
101 | * format would just give known plaintext). | |
102 | */ | |
aeaa3d9e | 103 | buffer_put_bignum(&buffer, key->rsa->d); |
104 | buffer_put_bignum(&buffer, key->rsa->iqmp); | |
105 | buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ | |
106 | buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ | |
5260325f | 107 | |
108 | /* Pad the part to be encrypted until its size is a multiple of 8. */ | |
109 | while (buffer_len(&buffer) % 8 != 0) | |
110 | buffer_put_char(&buffer, 0); | |
111 | ||
112 | /* This buffer will be used to contain the data in the file. */ | |
113 | buffer_init(&encrypted); | |
114 | ||
115 | /* First store keyfile id string. */ | |
7e2183c0 | 116 | for (i = 0; authfile_id_string[i]; i++) |
117 | buffer_put_char(&encrypted, authfile_id_string[i]); | |
5260325f | 118 | buffer_put_char(&encrypted, 0); |
119 | ||
120 | /* Store cipher type. */ | |
3ee832e5 | 121 | buffer_put_char(&encrypted, cipher_num); |
5260325f | 122 | buffer_put_int(&encrypted, 0); /* For future extension */ |
123 | ||
124 | /* Store public key. This will be in plain text. */ | |
aeaa3d9e | 125 | buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); |
126 | buffer_put_bignum(&encrypted, key->rsa->n); | |
127 | buffer_put_bignum(&encrypted, key->rsa->e); | |
449c5ba5 | 128 | buffer_put_cstring(&encrypted, comment); |
5260325f | 129 | |
130 | /* Allocate space for the private part of the key in the buffer. */ | |
6c0fa2b1 | 131 | cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
5260325f | 132 | |
3ee832e5 | 133 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
134 | CIPHER_ENCRYPT); | |
135 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 136 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 137 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 138 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
5260325f | 139 | |
140 | /* Destroy temporary data. */ | |
141 | memset(buf, 0, sizeof(buf)); | |
142 | buffer_free(&buffer); | |
143 | ||
a408af76 | 144 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
58cfa257 | 145 | if (fd < 0) { |
146 | error("open %s failed: %s.", filename, strerror(errno)); | |
1bd71826 | 147 | buffer_free(&encrypted); |
5260325f | 148 | return 0; |
58cfa257 | 149 | } |
a408af76 | 150 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
5260325f | 151 | buffer_len(&encrypted)) { |
58cfa257 | 152 | error("write to key file %s failed: %s", filename, |
184eed6a | 153 | strerror(errno)); |
5260325f | 154 | buffer_free(&encrypted); |
a408af76 | 155 | close(fd); |
77bb0bca | 156 | unlink(filename); |
5260325f | 157 | return 0; |
158 | } | |
a408af76 | 159 | close(fd); |
5260325f | 160 | buffer_free(&encrypted); |
161 | return 1; | |
8efc0c15 | 162 | } |
163 | ||
aeaa3d9e | 164 | /* save SSH v2 key in OpenSSL PEM format */ |
396c147e | 165 | static int |
aeaa3d9e | 166 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
167 | const char *comment) | |
a306f2dd | 168 | { |
169 | FILE *fp; | |
170 | int fd; | |
fa08c86b | 171 | int success = 0; |
172 | int len = strlen(_passphrase); | |
c66f9d0e | 173 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
714954dc | 174 | const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
a306f2dd | 175 | |
176 | if (len > 0 && len <= 4) { | |
58cfa257 | 177 | error("passphrase too short: have %d bytes, need > 4", len); |
a306f2dd | 178 | return 0; |
179 | } | |
180 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
181 | if (fd < 0) { | |
58cfa257 | 182 | error("open %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 183 | return 0; |
184 | } | |
185 | fp = fdopen(fd, "w"); | |
186 | if (fp == NULL ) { | |
58cfa257 | 187 | error("fdopen %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 188 | close(fd); |
189 | return 0; | |
190 | } | |
fa08c86b | 191 | switch (key->type) { |
569807fb | 192 | case KEY_DSA: |
193 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
194 | cipher, passphrase, len, NULL, NULL); | |
195 | break; | |
196 | case KEY_RSA: | |
197 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
198 | cipher, passphrase, len, NULL, NULL); | |
199 | break; | |
a306f2dd | 200 | } |
201 | fclose(fp); | |
202 | return success; | |
203 | } | |
204 | ||
205 | int | |
aeaa3d9e | 206 | key_save_private(Key *key, const char *filename, const char *passphrase, |
a306f2dd | 207 | const char *comment) |
208 | { | |
209 | switch (key->type) { | |
fa08c86b | 210 | case KEY_RSA1: |
aeaa3d9e | 211 | return key_save_private_rsa1(key, filename, passphrase, |
212 | comment); | |
a306f2dd | 213 | break; |
214 | case KEY_DSA: | |
fa08c86b | 215 | case KEY_RSA: |
aeaa3d9e | 216 | return key_save_private_pem(key, filename, passphrase, |
217 | comment); | |
a306f2dd | 218 | break; |
219 | default: | |
220 | break; | |
221 | } | |
58cfa257 | 222 | error("key_save_private: cannot save key type %d", key->type); |
a306f2dd | 223 | return 0; |
224 | } | |
225 | ||
aa3378df | 226 | /* |
aeaa3d9e | 227 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
228 | * encountered (the file does not exist or is not readable), and the key | |
aa3378df | 229 | * otherwise. |
230 | */ | |
8efc0c15 | 231 | |
396c147e | 232 | static Key * |
aeaa3d9e | 233 | key_load_public_rsa1(int fd, const char *filename, char **commentp) |
8efc0c15 | 234 | { |
5260325f | 235 | Buffer buffer; |
aeaa3d9e | 236 | Key *pub; |
378d9956 | 237 | struct stat st; |
5260325f | 238 | char *cp; |
aeaa3d9e | 239 | int i; |
f6be21a0 | 240 | size_t len; |
5260325f | 241 | |
378d9956 | 242 | if (fstat(fd, &st) < 0) { |
243 | error("fstat for key file %.200s failed: %.100s", | |
244 | filename, strerror(errno)); | |
245 | return NULL; | |
246 | } | |
528afafa | 247 | if (st.st_size > 1*1024*1024) { |
248 | error("key file %.200s too large", filename); | |
249 | return NULL; | |
250 | } | |
f6be21a0 | 251 | len = (size_t)st.st_size; /* truncated */ |
5260325f | 252 | |
253 | buffer_init(&buffer); | |
6c0fa2b1 | 254 | cp = buffer_append_space(&buffer, len); |
5260325f | 255 | |
a408af76 | 256 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 257 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 258 | strerror(errno)); |
5260325f | 259 | buffer_free(&buffer); |
aeaa3d9e | 260 | return NULL; |
5260325f | 261 | } |
5260325f | 262 | |
7e2183c0 | 263 | /* Check that it is at least big enough to contain the ID string. */ |
264 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 265 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 266 | buffer_free(&buffer); |
aeaa3d9e | 267 | return NULL; |
5260325f | 268 | } |
aa3378df | 269 | /* |
270 | * Make sure it begins with the id string. Consume the id string | |
271 | * from the buffer. | |
272 | */ | |
7e2183c0 | 273 | for (i = 0; i < sizeof(authfile_id_string); i++) |
274 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 275 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 276 | buffer_free(&buffer); |
aeaa3d9e | 277 | return NULL; |
5260325f | 278 | } |
279 | /* Skip cipher type and reserved data. */ | |
280 | (void) buffer_get_char(&buffer); /* cipher type */ | |
281 | (void) buffer_get_int(&buffer); /* reserved */ | |
282 | ||
283 | /* Read the public key from the buffer. */ | |
1169c3df | 284 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 285 | pub = key_new(KEY_RSA1); |
286 | buffer_get_bignum(&buffer, pub->rsa->n); | |
287 | buffer_get_bignum(&buffer, pub->rsa->e); | |
288 | if (commentp) | |
289 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 290 | /* The encrypted private part is not parsed by this function. */ |
291 | ||
8efc0c15 | 292 | buffer_free(&buffer); |
aeaa3d9e | 293 | return pub; |
8efc0c15 | 294 | } |
295 | ||
aeaa3d9e | 296 | /* load public key from private-key file, works only for SSH v1 */ |
297 | Key * | |
298 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 299 | { |
aeaa3d9e | 300 | Key *pub; |
301 | int fd; | |
302 | ||
303 | if (type == KEY_RSA1) { | |
304 | fd = open(filename, O_RDONLY); | |
305 | if (fd < 0) | |
306 | return NULL; | |
307 | pub = key_load_public_rsa1(fd, filename, commentp); | |
308 | close(fd); | |
309 | return pub; | |
a306f2dd | 310 | } |
aeaa3d9e | 311 | return NULL; |
a306f2dd | 312 | } |
313 | ||
aa3378df | 314 | /* |
315 | * Loads the private key from the file. Returns 0 if an error is encountered | |
316 | * (file does not exist or is not readable, or passphrase is bad). This | |
317 | * initializes the private key. | |
318 | * Assumes we are called under uid of the owner of the file. | |
319 | */ | |
8efc0c15 | 320 | |
396c147e | 321 | static Key * |
aeaa3d9e | 322 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
323 | char **commentp) | |
8efc0c15 | 324 | { |
a306f2dd | 325 | int i, check1, check2, cipher_type; |
f6be21a0 | 326 | size_t len; |
5260325f | 327 | Buffer buffer, decrypted; |
20905a8e | 328 | u_char *cp; |
94ec8c6b | 329 | CipherContext ciphercontext; |
330 | Cipher *cipher; | |
aeaa3d9e | 331 | Key *prv = NULL; |
378d9956 | 332 | struct stat st; |
5260325f | 333 | |
378d9956 | 334 | if (fstat(fd, &st) < 0) { |
335 | error("fstat for key file %.200s failed: %.100s", | |
336 | filename, strerror(errno)); | |
337 | close(fd); | |
338 | return NULL; | |
339 | } | |
f6be21a0 | 340 | if (st.st_size > 1*1024*1024) { |
528afafa | 341 | error("key file %.200s too large", filename); |
f6be21a0 | 342 | close(fd); |
343 | return (NULL); | |
344 | } | |
345 | len = (size_t)st.st_size; /* truncated */ | |
5260325f | 346 | |
347 | buffer_init(&buffer); | |
6c0fa2b1 | 348 | cp = buffer_append_space(&buffer, len); |
5260325f | 349 | |
a408af76 | 350 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 351 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 352 | strerror(errno)); |
5260325f | 353 | buffer_free(&buffer); |
a408af76 | 354 | close(fd); |
aeaa3d9e | 355 | return NULL; |
5260325f | 356 | } |
5260325f | 357 | |
7e2183c0 | 358 | /* Check that it is at least big enough to contain the ID string. */ |
359 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 360 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 361 | buffer_free(&buffer); |
81333640 | 362 | close(fd); |
aeaa3d9e | 363 | return NULL; |
5260325f | 364 | } |
aa3378df | 365 | /* |
366 | * Make sure it begins with the id string. Consume the id string | |
367 | * from the buffer. | |
368 | */ | |
7e2183c0 | 369 | for (i = 0; i < sizeof(authfile_id_string); i++) |
370 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 371 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 372 | buffer_free(&buffer); |
81333640 | 373 | close(fd); |
aeaa3d9e | 374 | return NULL; |
5260325f | 375 | } |
81333640 | 376 | |
5260325f | 377 | /* Read cipher type. */ |
378 | cipher_type = buffer_get_char(&buffer); | |
379 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
380 | ||
381 | /* Read the public key from the buffer. */ | |
1169c3df | 382 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 383 | prv = key_new_private(KEY_RSA1); |
384 | ||
385 | buffer_get_bignum(&buffer, prv->rsa->n); | |
386 | buffer_get_bignum(&buffer, prv->rsa->e); | |
387 | if (commentp) | |
388 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 389 | else |
390 | xfree(buffer_get_string(&buffer, NULL)); | |
391 | ||
392 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 393 | cipher = cipher_by_number(cipher_type); |
394 | if (cipher == NULL) { | |
395 | debug("Unsupported cipher %d used in key file %.200s.", | |
396 | cipher_type, filename); | |
5260325f | 397 | buffer_free(&buffer); |
398 | goto fail; | |
399 | } | |
400 | /* Initialize space for decrypted data. */ | |
401 | buffer_init(&decrypted); | |
6c0fa2b1 | 402 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
5260325f | 403 | |
404 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
3ee832e5 | 405 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
406 | CIPHER_DECRYPT); | |
407 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 408 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 409 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 410 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 411 | buffer_free(&buffer); |
5260325f | 412 | |
413 | check1 = buffer_get_char(&decrypted); | |
414 | check2 = buffer_get_char(&decrypted); | |
415 | if (check1 != buffer_get_char(&decrypted) || | |
416 | check2 != buffer_get_char(&decrypted)) { | |
417 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 418 | debug("Bad passphrase supplied for key file %.200s.", |
419 | filename); | |
5260325f | 420 | /* Bad passphrase. */ |
421 | buffer_free(&decrypted); | |
aeaa3d9e | 422 | goto fail; |
5260325f | 423 | } |
424 | /* Read the rest of the private key. */ | |
aeaa3d9e | 425 | buffer_get_bignum(&decrypted, prv->rsa->d); |
426 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
427 | /* in SSL and SSH v1 p and q are exchanged */ | |
428 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
429 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 430 | |
aeaa3d9e | 431 | /* calculate p-1 and q-1 */ |
b775c6f2 | 432 | rsa_generate_additional_parameters(prv->rsa); |
5260325f | 433 | |
434 | buffer_free(&decrypted); | |
15e98f49 | 435 | |
436 | /* enable blinding */ | |
437 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { | |
438 | error("key_load_private_rsa1: RSA_blinding_on failed"); | |
439 | goto fail; | |
440 | } | |
81333640 | 441 | close(fd); |
aeaa3d9e | 442 | return prv; |
443 | ||
444 | fail: | |
445 | if (commentp) | |
446 | xfree(*commentp); | |
447 | close(fd); | |
448 | key_free(prv); | |
449 | return NULL; | |
8efc0c15 | 450 | } |
a306f2dd | 451 | |
39c00dc2 | 452 | Key * |
aeaa3d9e | 453 | key_load_private_pem(int fd, int type, const char *passphrase, |
454 | char **commentp) | |
a306f2dd | 455 | { |
a306f2dd | 456 | FILE *fp; |
fa08c86b | 457 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 458 | Key *prv = NULL; |
fa08c86b | 459 | char *name = "<no key>"; |
a306f2dd | 460 | |
a306f2dd | 461 | fp = fdopen(fd, "r"); |
462 | if (fp == NULL) { | |
58cfa257 | 463 | error("fdopen failed: %s", strerror(errno)); |
81333640 | 464 | close(fd); |
aeaa3d9e | 465 | return NULL; |
a306f2dd | 466 | } |
fa08c86b | 467 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
468 | if (pk == NULL) { | |
ae88ea7e | 469 | debug("PEM_read_PrivateKey failed"); |
fa08c86b | 470 | (void)ERR_get_error(); |
aeaa3d9e | 471 | } else if (pk->type == EVP_PKEY_RSA && |
184eed6a | 472 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
aeaa3d9e | 473 | prv = key_new(KEY_UNSPEC); |
474 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
475 | prv->type = KEY_RSA; | |
476 | name = "rsa w/o comment"; | |
fa08c86b | 477 | #ifdef DEBUG_PK |
aeaa3d9e | 478 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 479 | #endif |
15e98f49 | 480 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
481 | error("key_load_private_pem: RSA_blinding_on failed"); | |
482 | key_free(prv); | |
483 | prv = NULL; | |
484 | } | |
aeaa3d9e | 485 | } else if (pk->type == EVP_PKEY_DSA && |
184eed6a | 486 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
aeaa3d9e | 487 | prv = key_new(KEY_UNSPEC); |
488 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
489 | prv->type = KEY_DSA; | |
490 | name = "dsa w/o comment"; | |
fa08c86b | 491 | #ifdef DEBUG_PK |
aeaa3d9e | 492 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 493 | #endif |
fa08c86b | 494 | } else { |
495 | error("PEM_read_PrivateKey: mismatch or " | |
496 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 497 | } |
a306f2dd | 498 | fclose(fp); |
fa08c86b | 499 | if (pk != NULL) |
500 | EVP_PKEY_free(pk); | |
aeaa3d9e | 501 | if (prv != NULL && commentp) |
502 | *commentp = xstrdup(name); | |
503 | debug("read PEM private key done: type %s", | |
504 | prv ? key_type(prv) : "<unknown>"); | |
505 | return prv; | |
a306f2dd | 506 | } |
507 | ||
396c147e | 508 | static int |
aeaa3d9e | 509 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 510 | { |
a306f2dd | 511 | struct stat st; |
512 | ||
d842a5eb | 513 | if (fstat(fd, &st) < 0) |
514 | return 0; | |
515 | /* | |
516 | * if a key owned by the user is accessed, then we check the | |
517 | * permissions of the file. if the key owned by a different user, | |
518 | * then we don't care. | |
519 | */ | |
9cd45ea4 | 520 | #ifdef HAVE_CYGWIN |
22d89d24 | 521 | if (check_ntsec(filename)) |
9cd45ea4 | 522 | #endif |
d842a5eb | 523 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
a306f2dd | 524 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
525 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
526 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
d842a5eb | 527 | error("Permissions 0%3.3o for '%s' are too open.", |
b9ed513a | 528 | (u_int)st.st_mode & 0777, filename); |
a306f2dd | 529 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 530 | error("This private key will be ignored."); |
a306f2dd | 531 | return 0; |
532 | } | |
aeaa3d9e | 533 | return 1; |
534 | } | |
81333640 | 535 | |
aeaa3d9e | 536 | Key * |
537 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
538 | char **commentp) | |
539 | { | |
540 | int fd; | |
541 | ||
542 | fd = open(filename, O_RDONLY); | |
543 | if (fd < 0) | |
544 | return NULL; | |
545 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 546 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 547 | close(fd); |
548 | return NULL; | |
549 | } | |
550 | switch (type) { | |
551 | case KEY_RSA1: | |
552 | return key_load_private_rsa1(fd, filename, passphrase, | |
553 | commentp); | |
554 | /* closes fd */ | |
a306f2dd | 555 | break; |
556 | case KEY_DSA: | |
fa08c86b | 557 | case KEY_RSA: |
558 | case KEY_UNSPEC: | |
aeaa3d9e | 559 | return key_load_private_pem(fd, type, passphrase, commentp); |
560 | /* closes fd */ | |
81333640 | 561 | break; |
a306f2dd | 562 | default: |
81333640 | 563 | close(fd); |
a306f2dd | 564 | break; |
565 | } | |
aeaa3d9e | 566 | return NULL; |
567 | } | |
568 | ||
569 | Key * | |
570 | key_load_private(const char *filename, const char *passphrase, | |
571 | char **commentp) | |
572 | { | |
eb2e1595 | 573 | Key *pub, *prv; |
aeaa3d9e | 574 | int fd; |
575 | ||
576 | fd = open(filename, O_RDONLY); | |
577 | if (fd < 0) | |
578 | return NULL; | |
579 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 580 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 581 | close(fd); |
582 | return NULL; | |
583 | } | |
584 | pub = key_load_public_rsa1(fd, filename, commentp); | |
585 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
586 | if (pub == NULL) { | |
587 | /* closes fd */ | |
eb2e1595 | 588 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
589 | /* use the filename as a comment for PEM */ | |
590 | if (commentp && prv) | |
a10bdd7c | 591 | *commentp = xstrdup(filename); |
aeaa3d9e | 592 | } else { |
593 | /* it's a SSH v1 key if the public key part is readable */ | |
594 | key_free(pub); | |
595 | /* closes fd */ | |
eb2e1595 | 596 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
aeaa3d9e | 597 | } |
eb2e1595 | 598 | return prv; |
a306f2dd | 599 | } |
bcbf86ec | 600 | |
396c147e | 601 | static int |
aeaa3d9e | 602 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 603 | { |
604 | FILE *f; | |
ea067773 | 605 | char line[SSH_MAX_PUBKEY_BYTES]; |
bcbf86ec | 606 | char *cp; |
41feb690 | 607 | u_long linenum = 0; |
bcbf86ec | 608 | |
609 | f = fopen(filename, "r"); | |
610 | if (f != NULL) { | |
ea067773 | 611 | while (read_keyfile_line(f, filename, line, sizeof(line), |
612 | &linenum) != -1) { | |
bcbf86ec | 613 | cp = line; |
6aacefa7 | 614 | switch (*cp) { |
bcbf86ec | 615 | case '#': |
616 | case '\n': | |
617 | case '\0': | |
618 | continue; | |
619 | } | |
620 | /* Skip leading whitespace. */ | |
621 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
622 | ; | |
623 | if (*cp) { | |
fa08c86b | 624 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 625 | if (commentp) |
626 | *commentp=xstrdup(filename); | |
627 | fclose(f); | |
628 | return 1; | |
629 | } | |
630 | } | |
631 | } | |
632 | fclose(f); | |
633 | } | |
634 | return 0; | |
635 | } | |
636 | ||
aeaa3d9e | 637 | /* load public key from ssh v1 private or any pubkey file */ |
638 | Key * | |
639 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 640 | { |
aeaa3d9e | 641 | Key *pub; |
642 | char file[MAXPATHLEN]; | |
643 | ||
3566c73c | 644 | /* try rsa1 private key */ |
aeaa3d9e | 645 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
646 | if (pub != NULL) | |
647 | return pub; | |
3566c73c | 648 | |
649 | /* try rsa1 public key */ | |
650 | pub = key_new(KEY_RSA1); | |
651 | if (key_try_load_public(pub, filename, commentp) == 1) | |
652 | return pub; | |
653 | key_free(pub); | |
654 | ||
655 | /* try ssh2 public key */ | |
aeaa3d9e | 656 | pub = key_new(KEY_UNSPEC); |
657 | if (key_try_load_public(pub, filename, commentp) == 1) | |
658 | return pub; | |
659 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
660 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
661 | (key_try_load_public(pub, file, commentp) == 1)) | |
662 | return pub; | |
663 | key_free(pub); | |
664 | return NULL; | |
bcbf86ec | 665 | } |