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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" | |
ca75d7de | 39 | RCSID("$OpenBSD: authfile.c,v 1.57 2004/06/21 17:36:31 avsm 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 | 56 | static 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 | 66 | static int |
aeaa3d9e | 67 | key_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; | |
ca75d7de | 75 | u_int32_t rnd; |
5260325f | 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. */ | |
ca75d7de | 90 | rnd = arc4random(); |
91 | buf[0] = rnd & 0xff; | |
92 | buf[1] = (rnd >> 8) & 0xff; | |
5260325f | 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 | 164 | static int |
aeaa3d9e | 165 | key_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 | ||
204 | int | |
aeaa3d9e | 205 | key_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 | 231 | static Key * |
aeaa3d9e | 232 | key_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; |
f6be21a0 | 239 | size_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 | } | |
f6be21a0 | 246 | if (st.st_size > 1*1024*1024) |
247 | close(fd); | |
248 | len = (size_t)st.st_size; /* truncated */ | |
5260325f | 249 | |
250 | buffer_init(&buffer); | |
6c0fa2b1 | 251 | cp = buffer_append_space(&buffer, len); |
5260325f | 252 | |
a408af76 | 253 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 254 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 255 | strerror(errno)); |
5260325f | 256 | buffer_free(&buffer); |
aeaa3d9e | 257 | return NULL; |
5260325f | 258 | } |
5260325f | 259 | |
7e2183c0 | 260 | /* Check that it is at least big enough to contain the ID string. */ |
261 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 262 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 263 | buffer_free(&buffer); |
aeaa3d9e | 264 | return NULL; |
5260325f | 265 | } |
aa3378df | 266 | /* |
267 | * Make sure it begins with the id string. Consume the id string | |
268 | * from the buffer. | |
269 | */ | |
7e2183c0 | 270 | for (i = 0; i < sizeof(authfile_id_string); i++) |
271 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 272 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 273 | buffer_free(&buffer); |
aeaa3d9e | 274 | return NULL; |
5260325f | 275 | } |
276 | /* Skip cipher type and reserved data. */ | |
277 | (void) buffer_get_char(&buffer); /* cipher type */ | |
278 | (void) buffer_get_int(&buffer); /* reserved */ | |
279 | ||
280 | /* Read the public key from the buffer. */ | |
1169c3df | 281 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 282 | pub = key_new(KEY_RSA1); |
283 | buffer_get_bignum(&buffer, pub->rsa->n); | |
284 | buffer_get_bignum(&buffer, pub->rsa->e); | |
285 | if (commentp) | |
286 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 287 | /* The encrypted private part is not parsed by this function. */ |
288 | ||
8efc0c15 | 289 | buffer_free(&buffer); |
aeaa3d9e | 290 | return pub; |
8efc0c15 | 291 | } |
292 | ||
aeaa3d9e | 293 | /* load public key from private-key file, works only for SSH v1 */ |
294 | Key * | |
295 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 296 | { |
aeaa3d9e | 297 | Key *pub; |
298 | int fd; | |
299 | ||
300 | if (type == KEY_RSA1) { | |
301 | fd = open(filename, O_RDONLY); | |
302 | if (fd < 0) | |
303 | return NULL; | |
304 | pub = key_load_public_rsa1(fd, filename, commentp); | |
305 | close(fd); | |
306 | return pub; | |
a306f2dd | 307 | } |
aeaa3d9e | 308 | return NULL; |
a306f2dd | 309 | } |
310 | ||
aa3378df | 311 | /* |
312 | * Loads the private key from the file. Returns 0 if an error is encountered | |
313 | * (file does not exist or is not readable, or passphrase is bad). This | |
314 | * initializes the private key. | |
315 | * Assumes we are called under uid of the owner of the file. | |
316 | */ | |
8efc0c15 | 317 | |
396c147e | 318 | static Key * |
aeaa3d9e | 319 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
320 | char **commentp) | |
8efc0c15 | 321 | { |
a306f2dd | 322 | int i, check1, check2, cipher_type; |
f6be21a0 | 323 | size_t len; |
5260325f | 324 | Buffer buffer, decrypted; |
20905a8e | 325 | u_char *cp; |
94ec8c6b | 326 | CipherContext ciphercontext; |
327 | Cipher *cipher; | |
aeaa3d9e | 328 | Key *prv = NULL; |
378d9956 | 329 | struct stat st; |
5260325f | 330 | |
378d9956 | 331 | if (fstat(fd, &st) < 0) { |
332 | error("fstat for key file %.200s failed: %.100s", | |
333 | filename, strerror(errno)); | |
334 | close(fd); | |
335 | return NULL; | |
336 | } | |
f6be21a0 | 337 | if (st.st_size > 1*1024*1024) { |
338 | close(fd); | |
339 | return (NULL); | |
340 | } | |
341 | len = (size_t)st.st_size; /* truncated */ | |
5260325f | 342 | |
343 | buffer_init(&buffer); | |
6c0fa2b1 | 344 | cp = buffer_append_space(&buffer, len); |
5260325f | 345 | |
a408af76 | 346 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 347 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 348 | strerror(errno)); |
5260325f | 349 | buffer_free(&buffer); |
a408af76 | 350 | close(fd); |
aeaa3d9e | 351 | return NULL; |
5260325f | 352 | } |
5260325f | 353 | |
7e2183c0 | 354 | /* Check that it is at least big enough to contain the ID string. */ |
355 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 356 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 357 | buffer_free(&buffer); |
81333640 | 358 | close(fd); |
aeaa3d9e | 359 | return NULL; |
5260325f | 360 | } |
aa3378df | 361 | /* |
362 | * Make sure it begins with the id string. Consume the id string | |
363 | * from the buffer. | |
364 | */ | |
7e2183c0 | 365 | for (i = 0; i < sizeof(authfile_id_string); i++) |
366 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 367 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 368 | buffer_free(&buffer); |
81333640 | 369 | close(fd); |
aeaa3d9e | 370 | return NULL; |
5260325f | 371 | } |
81333640 | 372 | |
5260325f | 373 | /* Read cipher type. */ |
374 | cipher_type = buffer_get_char(&buffer); | |
375 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
376 | ||
377 | /* Read the public key from the buffer. */ | |
1169c3df | 378 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 379 | prv = key_new_private(KEY_RSA1); |
380 | ||
381 | buffer_get_bignum(&buffer, prv->rsa->n); | |
382 | buffer_get_bignum(&buffer, prv->rsa->e); | |
383 | if (commentp) | |
384 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 385 | else |
386 | xfree(buffer_get_string(&buffer, NULL)); | |
387 | ||
388 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 389 | cipher = cipher_by_number(cipher_type); |
390 | if (cipher == NULL) { | |
391 | debug("Unsupported cipher %d used in key file %.200s.", | |
392 | cipher_type, filename); | |
5260325f | 393 | buffer_free(&buffer); |
394 | goto fail; | |
395 | } | |
396 | /* Initialize space for decrypted data. */ | |
397 | buffer_init(&decrypted); | |
6c0fa2b1 | 398 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
5260325f | 399 | |
400 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
3ee832e5 | 401 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
402 | CIPHER_DECRYPT); | |
403 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 404 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 405 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 406 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 407 | buffer_free(&buffer); |
5260325f | 408 | |
409 | check1 = buffer_get_char(&decrypted); | |
410 | check2 = buffer_get_char(&decrypted); | |
411 | if (check1 != buffer_get_char(&decrypted) || | |
412 | check2 != buffer_get_char(&decrypted)) { | |
413 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 414 | debug("Bad passphrase supplied for key file %.200s.", |
415 | filename); | |
5260325f | 416 | /* Bad passphrase. */ |
417 | buffer_free(&decrypted); | |
aeaa3d9e | 418 | goto fail; |
5260325f | 419 | } |
420 | /* Read the rest of the private key. */ | |
aeaa3d9e | 421 | buffer_get_bignum(&decrypted, prv->rsa->d); |
422 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
423 | /* in SSL and SSH v1 p and q are exchanged */ | |
424 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
425 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 426 | |
aeaa3d9e | 427 | /* calculate p-1 and q-1 */ |
b775c6f2 | 428 | rsa_generate_additional_parameters(prv->rsa); |
5260325f | 429 | |
430 | buffer_free(&decrypted); | |
15e98f49 | 431 | |
432 | /* enable blinding */ | |
433 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { | |
434 | error("key_load_private_rsa1: RSA_blinding_on failed"); | |
435 | goto fail; | |
436 | } | |
81333640 | 437 | close(fd); |
aeaa3d9e | 438 | return prv; |
439 | ||
440 | fail: | |
441 | if (commentp) | |
442 | xfree(*commentp); | |
443 | close(fd); | |
444 | key_free(prv); | |
445 | return NULL; | |
8efc0c15 | 446 | } |
a306f2dd | 447 | |
39c00dc2 | 448 | Key * |
aeaa3d9e | 449 | key_load_private_pem(int fd, int type, const char *passphrase, |
450 | char **commentp) | |
a306f2dd | 451 | { |
a306f2dd | 452 | FILE *fp; |
fa08c86b | 453 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 454 | Key *prv = NULL; |
fa08c86b | 455 | char *name = "<no key>"; |
a306f2dd | 456 | |
a306f2dd | 457 | fp = fdopen(fd, "r"); |
458 | if (fp == NULL) { | |
58cfa257 | 459 | error("fdopen failed: %s", strerror(errno)); |
81333640 | 460 | close(fd); |
aeaa3d9e | 461 | return NULL; |
a306f2dd | 462 | } |
fa08c86b | 463 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
464 | if (pk == NULL) { | |
ae88ea7e | 465 | debug("PEM_read_PrivateKey failed"); |
fa08c86b | 466 | (void)ERR_get_error(); |
aeaa3d9e | 467 | } else if (pk->type == EVP_PKEY_RSA && |
184eed6a | 468 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
aeaa3d9e | 469 | prv = key_new(KEY_UNSPEC); |
470 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
471 | prv->type = KEY_RSA; | |
472 | name = "rsa w/o comment"; | |
fa08c86b | 473 | #ifdef DEBUG_PK |
aeaa3d9e | 474 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 475 | #endif |
15e98f49 | 476 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
477 | error("key_load_private_pem: RSA_blinding_on failed"); | |
478 | key_free(prv); | |
479 | prv = NULL; | |
480 | } | |
aeaa3d9e | 481 | } else if (pk->type == EVP_PKEY_DSA && |
184eed6a | 482 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
aeaa3d9e | 483 | prv = key_new(KEY_UNSPEC); |
484 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
485 | prv->type = KEY_DSA; | |
486 | name = "dsa w/o comment"; | |
fa08c86b | 487 | #ifdef DEBUG_PK |
aeaa3d9e | 488 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 489 | #endif |
fa08c86b | 490 | } else { |
491 | error("PEM_read_PrivateKey: mismatch or " | |
492 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 493 | } |
a306f2dd | 494 | fclose(fp); |
fa08c86b | 495 | if (pk != NULL) |
496 | EVP_PKEY_free(pk); | |
aeaa3d9e | 497 | if (prv != NULL && commentp) |
498 | *commentp = xstrdup(name); | |
499 | debug("read PEM private key done: type %s", | |
500 | prv ? key_type(prv) : "<unknown>"); | |
501 | return prv; | |
a306f2dd | 502 | } |
503 | ||
396c147e | 504 | static int |
aeaa3d9e | 505 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 506 | { |
a306f2dd | 507 | struct stat st; |
508 | ||
d842a5eb | 509 | if (fstat(fd, &st) < 0) |
510 | return 0; | |
511 | /* | |
512 | * if a key owned by the user is accessed, then we check the | |
513 | * permissions of the file. if the key owned by a different user, | |
514 | * then we don't care. | |
515 | */ | |
9cd45ea4 | 516 | #ifdef HAVE_CYGWIN |
22d89d24 | 517 | if (check_ntsec(filename)) |
9cd45ea4 | 518 | #endif |
d842a5eb | 519 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
a306f2dd | 520 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
521 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
522 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
d842a5eb | 523 | error("Permissions 0%3.3o for '%s' are too open.", |
b9ed513a | 524 | (u_int)st.st_mode & 0777, filename); |
a306f2dd | 525 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 526 | error("This private key will be ignored."); |
a306f2dd | 527 | return 0; |
528 | } | |
aeaa3d9e | 529 | return 1; |
530 | } | |
81333640 | 531 | |
aeaa3d9e | 532 | Key * |
533 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
534 | char **commentp) | |
535 | { | |
536 | int fd; | |
537 | ||
538 | fd = open(filename, O_RDONLY); | |
539 | if (fd < 0) | |
540 | return NULL; | |
541 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 542 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 543 | close(fd); |
544 | return NULL; | |
545 | } | |
546 | switch (type) { | |
547 | case KEY_RSA1: | |
548 | return key_load_private_rsa1(fd, filename, passphrase, | |
549 | commentp); | |
550 | /* closes fd */ | |
a306f2dd | 551 | break; |
552 | case KEY_DSA: | |
fa08c86b | 553 | case KEY_RSA: |
554 | case KEY_UNSPEC: | |
aeaa3d9e | 555 | return key_load_private_pem(fd, type, passphrase, commentp); |
556 | /* closes fd */ | |
81333640 | 557 | break; |
a306f2dd | 558 | default: |
81333640 | 559 | close(fd); |
a306f2dd | 560 | break; |
561 | } | |
aeaa3d9e | 562 | return NULL; |
563 | } | |
564 | ||
565 | Key * | |
566 | key_load_private(const char *filename, const char *passphrase, | |
567 | char **commentp) | |
568 | { | |
eb2e1595 | 569 | Key *pub, *prv; |
aeaa3d9e | 570 | int fd; |
571 | ||
572 | fd = open(filename, O_RDONLY); | |
573 | if (fd < 0) | |
574 | return NULL; | |
575 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 576 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 577 | close(fd); |
578 | return NULL; | |
579 | } | |
580 | pub = key_load_public_rsa1(fd, filename, commentp); | |
581 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
582 | if (pub == NULL) { | |
583 | /* closes fd */ | |
eb2e1595 | 584 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
585 | /* use the filename as a comment for PEM */ | |
586 | if (commentp && prv) | |
a10bdd7c | 587 | *commentp = xstrdup(filename); |
aeaa3d9e | 588 | } else { |
589 | /* it's a SSH v1 key if the public key part is readable */ | |
590 | key_free(pub); | |
591 | /* closes fd */ | |
eb2e1595 | 592 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
aeaa3d9e | 593 | } |
eb2e1595 | 594 | return prv; |
a306f2dd | 595 | } |
bcbf86ec | 596 | |
396c147e | 597 | static int |
aeaa3d9e | 598 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 599 | { |
600 | FILE *f; | |
aeaa3d9e | 601 | char line[4096]; |
bcbf86ec | 602 | char *cp; |
603 | ||
604 | f = fopen(filename, "r"); | |
605 | if (f != NULL) { | |
606 | while (fgets(line, sizeof(line), f)) { | |
607 | line[sizeof(line)-1] = '\0'; | |
608 | cp = line; | |
6aacefa7 | 609 | switch (*cp) { |
bcbf86ec | 610 | case '#': |
611 | case '\n': | |
612 | case '\0': | |
613 | continue; | |
614 | } | |
615 | /* Skip leading whitespace. */ | |
616 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
617 | ; | |
618 | if (*cp) { | |
fa08c86b | 619 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 620 | if (commentp) |
621 | *commentp=xstrdup(filename); | |
622 | fclose(f); | |
623 | return 1; | |
624 | } | |
625 | } | |
626 | } | |
627 | fclose(f); | |
628 | } | |
629 | return 0; | |
630 | } | |
631 | ||
aeaa3d9e | 632 | /* load public key from ssh v1 private or any pubkey file */ |
633 | Key * | |
634 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 635 | { |
aeaa3d9e | 636 | Key *pub; |
637 | char file[MAXPATHLEN]; | |
638 | ||
3566c73c | 639 | /* try rsa1 private key */ |
aeaa3d9e | 640 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
641 | if (pub != NULL) | |
642 | return pub; | |
3566c73c | 643 | |
644 | /* try rsa1 public key */ | |
645 | pub = key_new(KEY_RSA1); | |
646 | if (key_try_load_public(pub, filename, commentp) == 1) | |
647 | return pub; | |
648 | key_free(pub); | |
649 | ||
650 | /* try ssh2 public key */ | |
aeaa3d9e | 651 | pub = key_new(KEY_UNSPEC); |
652 | if (key_try_load_public(pub, filename, commentp) == 1) | |
653 | return pub; | |
654 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
655 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
656 | (key_try_load_public(pub, file, commentp) == 1)) | |
657 | return pub; | |
658 | key_free(pub); | |
659 | return NULL; | |
bcbf86ec | 660 | } |