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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" | |
2ceb8101 | 39 | RCSID("$OpenBSD: authfile.c,v 1.61 2005/06/17 02:44:32 djm 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" |
2ceb8101 | 55 | #include "atomicio.h" |
8efc0c15 | 56 | |
aeaa3d9e | 57 | /* Version identification string for SSH v1 identity files. */ |
7e2183c0 | 58 | static const char authfile_id_string[] = |
59 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; | |
8efc0c15 | 60 | |
aa3378df | 61 | /* |
62 | * Saves the authentication (private) key in a file, encrypting it with | |
63 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
64 | * precede the key to provide identification of the key without needing a | |
65 | * passphrase. | |
66 | */ | |
8efc0c15 | 67 | |
396c147e | 68 | static int |
aeaa3d9e | 69 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
70 | const char *comment) | |
8efc0c15 | 71 | { |
5260325f | 72 | Buffer buffer, encrypted; |
20905a8e | 73 | u_char buf[100], *cp; |
3ee832e5 | 74 | int fd, i, cipher_num; |
94ec8c6b | 75 | CipherContext ciphercontext; |
76 | Cipher *cipher; | |
ca75d7de | 77 | u_int32_t rnd; |
5260325f | 78 | |
aa3378df | 79 | /* |
80 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
81 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
82 | */ | |
3ee832e5 | 83 | cipher_num = (strcmp(passphrase, "") == 0) ? |
84 | SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; | |
85 | if ((cipher = cipher_by_number(cipher_num)) == NULL) | |
94ec8c6b | 86 | fatal("save_private_key_rsa: bad cipher"); |
5260325f | 87 | |
88 | /* This buffer is used to built the secret part of the private key. */ | |
89 | buffer_init(&buffer); | |
90 | ||
91 | /* Put checkbytes for checking passphrase validity. */ | |
ca75d7de | 92 | rnd = arc4random(); |
93 | buf[0] = rnd & 0xff; | |
94 | buf[1] = (rnd >> 8) & 0xff; | |
5260325f | 95 | buf[2] = buf[0]; |
96 | buf[3] = buf[1]; | |
97 | buffer_append(&buffer, buf, 4); | |
98 | ||
aa3378df | 99 | /* |
100 | * Store the private key (n and e will not be stored because they | |
101 | * will be stored in plain text, and storing them also in encrypted | |
102 | * format would just give known plaintext). | |
103 | */ | |
aeaa3d9e | 104 | buffer_put_bignum(&buffer, key->rsa->d); |
105 | buffer_put_bignum(&buffer, key->rsa->iqmp); | |
106 | buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ | |
107 | buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ | |
5260325f | 108 | |
109 | /* Pad the part to be encrypted until its size is a multiple of 8. */ | |
110 | while (buffer_len(&buffer) % 8 != 0) | |
111 | buffer_put_char(&buffer, 0); | |
112 | ||
113 | /* This buffer will be used to contain the data in the file. */ | |
114 | buffer_init(&encrypted); | |
115 | ||
116 | /* First store keyfile id string. */ | |
7e2183c0 | 117 | for (i = 0; authfile_id_string[i]; i++) |
118 | buffer_put_char(&encrypted, authfile_id_string[i]); | |
5260325f | 119 | buffer_put_char(&encrypted, 0); |
120 | ||
121 | /* Store cipher type. */ | |
3ee832e5 | 122 | buffer_put_char(&encrypted, cipher_num); |
5260325f | 123 | buffer_put_int(&encrypted, 0); /* For future extension */ |
124 | ||
125 | /* Store public key. This will be in plain text. */ | |
aeaa3d9e | 126 | buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); |
127 | buffer_put_bignum(&encrypted, key->rsa->n); | |
128 | buffer_put_bignum(&encrypted, key->rsa->e); | |
449c5ba5 | 129 | buffer_put_cstring(&encrypted, comment); |
5260325f | 130 | |
131 | /* Allocate space for the private part of the key in the buffer. */ | |
6c0fa2b1 | 132 | cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
5260325f | 133 | |
3ee832e5 | 134 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
135 | CIPHER_ENCRYPT); | |
136 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 137 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 138 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 139 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
5260325f | 140 | |
141 | /* Destroy temporary data. */ | |
142 | memset(buf, 0, sizeof(buf)); | |
143 | buffer_free(&buffer); | |
144 | ||
a408af76 | 145 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
58cfa257 | 146 | if (fd < 0) { |
147 | error("open %s failed: %s.", filename, strerror(errno)); | |
1bd71826 | 148 | buffer_free(&encrypted); |
5260325f | 149 | return 0; |
58cfa257 | 150 | } |
2ceb8101 | 151 | if (atomicio(vwrite, fd, buffer_ptr(&encrypted), |
152 | buffer_len(&encrypted)) != buffer_len(&encrypted)) { | |
58cfa257 | 153 | error("write to key file %s failed: %s", filename, |
184eed6a | 154 | strerror(errno)); |
5260325f | 155 | buffer_free(&encrypted); |
a408af76 | 156 | close(fd); |
77bb0bca | 157 | unlink(filename); |
5260325f | 158 | return 0; |
159 | } | |
a408af76 | 160 | close(fd); |
5260325f | 161 | buffer_free(&encrypted); |
162 | return 1; | |
8efc0c15 | 163 | } |
164 | ||
aeaa3d9e | 165 | /* save SSH v2 key in OpenSSL PEM format */ |
396c147e | 166 | static int |
aeaa3d9e | 167 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
168 | const char *comment) | |
a306f2dd | 169 | { |
170 | FILE *fp; | |
171 | int fd; | |
fa08c86b | 172 | int success = 0; |
173 | int len = strlen(_passphrase); | |
c66f9d0e | 174 | u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
714954dc | 175 | const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
a306f2dd | 176 | |
177 | if (len > 0 && len <= 4) { | |
58cfa257 | 178 | error("passphrase too short: have %d bytes, need > 4", len); |
a306f2dd | 179 | return 0; |
180 | } | |
181 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
182 | if (fd < 0) { | |
58cfa257 | 183 | error("open %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 184 | return 0; |
185 | } | |
186 | fp = fdopen(fd, "w"); | |
187 | if (fp == NULL ) { | |
58cfa257 | 188 | error("fdopen %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 189 | close(fd); |
190 | return 0; | |
191 | } | |
fa08c86b | 192 | switch (key->type) { |
569807fb | 193 | case KEY_DSA: |
194 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
195 | cipher, passphrase, len, NULL, NULL); | |
196 | break; | |
197 | case KEY_RSA: | |
198 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
199 | cipher, passphrase, len, NULL, NULL); | |
200 | break; | |
a306f2dd | 201 | } |
202 | fclose(fp); | |
203 | return success; | |
204 | } | |
205 | ||
206 | int | |
aeaa3d9e | 207 | key_save_private(Key *key, const char *filename, const char *passphrase, |
a306f2dd | 208 | const char *comment) |
209 | { | |
210 | switch (key->type) { | |
fa08c86b | 211 | case KEY_RSA1: |
aeaa3d9e | 212 | return key_save_private_rsa1(key, filename, passphrase, |
213 | comment); | |
a306f2dd | 214 | break; |
215 | case KEY_DSA: | |
fa08c86b | 216 | case KEY_RSA: |
aeaa3d9e | 217 | return key_save_private_pem(key, filename, passphrase, |
218 | comment); | |
a306f2dd | 219 | break; |
220 | default: | |
221 | break; | |
222 | } | |
58cfa257 | 223 | error("key_save_private: cannot save key type %d", key->type); |
a306f2dd | 224 | return 0; |
225 | } | |
226 | ||
aa3378df | 227 | /* |
aeaa3d9e | 228 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
229 | * encountered (the file does not exist or is not readable), and the key | |
aa3378df | 230 | * otherwise. |
231 | */ | |
8efc0c15 | 232 | |
396c147e | 233 | static Key * |
aeaa3d9e | 234 | key_load_public_rsa1(int fd, const char *filename, char **commentp) |
8efc0c15 | 235 | { |
5260325f | 236 | Buffer buffer; |
aeaa3d9e | 237 | Key *pub; |
378d9956 | 238 | struct stat st; |
5260325f | 239 | char *cp; |
2ceb8101 | 240 | u_int i; |
f6be21a0 | 241 | size_t len; |
5260325f | 242 | |
378d9956 | 243 | if (fstat(fd, &st) < 0) { |
244 | error("fstat for key file %.200s failed: %.100s", | |
245 | filename, strerror(errno)); | |
246 | return NULL; | |
247 | } | |
528afafa | 248 | if (st.st_size > 1*1024*1024) { |
249 | error("key file %.200s too large", filename); | |
250 | return NULL; | |
251 | } | |
f6be21a0 | 252 | len = (size_t)st.st_size; /* truncated */ |
5260325f | 253 | |
254 | buffer_init(&buffer); | |
6c0fa2b1 | 255 | cp = buffer_append_space(&buffer, len); |
5260325f | 256 | |
2ceb8101 | 257 | if (atomicio(read, fd, cp, len) != len) { |
5260325f | 258 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 259 | strerror(errno)); |
5260325f | 260 | buffer_free(&buffer); |
aeaa3d9e | 261 | return NULL; |
5260325f | 262 | } |
5260325f | 263 | |
7e2183c0 | 264 | /* Check that it is at least big enough to contain the ID string. */ |
265 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 266 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 267 | buffer_free(&buffer); |
aeaa3d9e | 268 | return NULL; |
5260325f | 269 | } |
aa3378df | 270 | /* |
271 | * Make sure it begins with the id string. Consume the id string | |
272 | * from the buffer. | |
273 | */ | |
7e2183c0 | 274 | for (i = 0; i < sizeof(authfile_id_string); i++) |
275 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 276 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 277 | buffer_free(&buffer); |
aeaa3d9e | 278 | return NULL; |
5260325f | 279 | } |
280 | /* Skip cipher type and reserved data. */ | |
281 | (void) buffer_get_char(&buffer); /* cipher type */ | |
282 | (void) buffer_get_int(&buffer); /* reserved */ | |
283 | ||
284 | /* Read the public key from the buffer. */ | |
1169c3df | 285 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 286 | pub = key_new(KEY_RSA1); |
287 | buffer_get_bignum(&buffer, pub->rsa->n); | |
288 | buffer_get_bignum(&buffer, pub->rsa->e); | |
289 | if (commentp) | |
290 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 291 | /* The encrypted private part is not parsed by this function. */ |
292 | ||
8efc0c15 | 293 | buffer_free(&buffer); |
aeaa3d9e | 294 | return pub; |
8efc0c15 | 295 | } |
296 | ||
aeaa3d9e | 297 | /* load public key from private-key file, works only for SSH v1 */ |
298 | Key * | |
299 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 300 | { |
aeaa3d9e | 301 | Key *pub; |
302 | int fd; | |
303 | ||
304 | if (type == KEY_RSA1) { | |
305 | fd = open(filename, O_RDONLY); | |
306 | if (fd < 0) | |
307 | return NULL; | |
308 | pub = key_load_public_rsa1(fd, filename, commentp); | |
309 | close(fd); | |
310 | return pub; | |
a306f2dd | 311 | } |
aeaa3d9e | 312 | return NULL; |
a306f2dd | 313 | } |
314 | ||
aa3378df | 315 | /* |
316 | * Loads the private key from the file. Returns 0 if an error is encountered | |
317 | * (file does not exist or is not readable, or passphrase is bad). This | |
318 | * initializes the private key. | |
319 | * Assumes we are called under uid of the owner of the file. | |
320 | */ | |
8efc0c15 | 321 | |
396c147e | 322 | static Key * |
aeaa3d9e | 323 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
324 | char **commentp) | |
8efc0c15 | 325 | { |
2ceb8101 | 326 | u_int i; |
327 | int check1, check2, cipher_type; | |
f6be21a0 | 328 | size_t len; |
5260325f | 329 | Buffer buffer, decrypted; |
20905a8e | 330 | u_char *cp; |
94ec8c6b | 331 | CipherContext ciphercontext; |
332 | Cipher *cipher; | |
aeaa3d9e | 333 | Key *prv = NULL; |
378d9956 | 334 | struct stat st; |
5260325f | 335 | |
378d9956 | 336 | if (fstat(fd, &st) < 0) { |
337 | error("fstat for key file %.200s failed: %.100s", | |
338 | filename, strerror(errno)); | |
339 | close(fd); | |
340 | return NULL; | |
341 | } | |
f6be21a0 | 342 | if (st.st_size > 1*1024*1024) { |
528afafa | 343 | error("key file %.200s too large", filename); |
f6be21a0 | 344 | close(fd); |
345 | return (NULL); | |
346 | } | |
347 | len = (size_t)st.st_size; /* truncated */ | |
5260325f | 348 | |
349 | buffer_init(&buffer); | |
6c0fa2b1 | 350 | cp = buffer_append_space(&buffer, len); |
5260325f | 351 | |
2ceb8101 | 352 | if (atomicio(read, fd, cp, len) != len) { |
5260325f | 353 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 354 | strerror(errno)); |
5260325f | 355 | buffer_free(&buffer); |
a408af76 | 356 | close(fd); |
aeaa3d9e | 357 | return NULL; |
5260325f | 358 | } |
5260325f | 359 | |
7e2183c0 | 360 | /* Check that it is at least big enough to contain the ID string. */ |
361 | if (len < sizeof(authfile_id_string)) { | |
2cdccb44 | 362 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 363 | buffer_free(&buffer); |
81333640 | 364 | close(fd); |
aeaa3d9e | 365 | return NULL; |
5260325f | 366 | } |
aa3378df | 367 | /* |
368 | * Make sure it begins with the id string. Consume the id string | |
369 | * from the buffer. | |
370 | */ | |
7e2183c0 | 371 | for (i = 0; i < sizeof(authfile_id_string); i++) |
372 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
2cdccb44 | 373 | debug3("Not a RSA1 key file %.200s.", filename); |
5260325f | 374 | buffer_free(&buffer); |
81333640 | 375 | close(fd); |
aeaa3d9e | 376 | return NULL; |
5260325f | 377 | } |
81333640 | 378 | |
5260325f | 379 | /* Read cipher type. */ |
380 | cipher_type = buffer_get_char(&buffer); | |
381 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
382 | ||
383 | /* Read the public key from the buffer. */ | |
1169c3df | 384 | (void) buffer_get_int(&buffer); |
aeaa3d9e | 385 | prv = key_new_private(KEY_RSA1); |
386 | ||
387 | buffer_get_bignum(&buffer, prv->rsa->n); | |
388 | buffer_get_bignum(&buffer, prv->rsa->e); | |
389 | if (commentp) | |
390 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 391 | else |
392 | xfree(buffer_get_string(&buffer, NULL)); | |
393 | ||
394 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 395 | cipher = cipher_by_number(cipher_type); |
396 | if (cipher == NULL) { | |
397 | debug("Unsupported cipher %d used in key file %.200s.", | |
398 | cipher_type, filename); | |
5260325f | 399 | buffer_free(&buffer); |
400 | goto fail; | |
401 | } | |
402 | /* Initialize space for decrypted data. */ | |
403 | buffer_init(&decrypted); | |
6c0fa2b1 | 404 | cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
5260325f | 405 | |
406 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
3ee832e5 | 407 | cipher_set_key_string(&ciphercontext, cipher, passphrase, |
408 | CIPHER_DECRYPT); | |
409 | cipher_crypt(&ciphercontext, cp, | |
20905a8e | 410 | buffer_ptr(&buffer), buffer_len(&buffer)); |
3ee832e5 | 411 | cipher_cleanup(&ciphercontext); |
94ec8c6b | 412 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 413 | buffer_free(&buffer); |
5260325f | 414 | |
415 | check1 = buffer_get_char(&decrypted); | |
416 | check2 = buffer_get_char(&decrypted); | |
417 | if (check1 != buffer_get_char(&decrypted) || | |
418 | check2 != buffer_get_char(&decrypted)) { | |
419 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 420 | debug("Bad passphrase supplied for key file %.200s.", |
421 | filename); | |
5260325f | 422 | /* Bad passphrase. */ |
423 | buffer_free(&decrypted); | |
aeaa3d9e | 424 | goto fail; |
5260325f | 425 | } |
426 | /* Read the rest of the private key. */ | |
aeaa3d9e | 427 | buffer_get_bignum(&decrypted, prv->rsa->d); |
428 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
429 | /* in SSL and SSH v1 p and q are exchanged */ | |
430 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
431 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 432 | |
aeaa3d9e | 433 | /* calculate p-1 and q-1 */ |
b775c6f2 | 434 | rsa_generate_additional_parameters(prv->rsa); |
5260325f | 435 | |
436 | buffer_free(&decrypted); | |
15e98f49 | 437 | |
438 | /* enable blinding */ | |
439 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { | |
440 | error("key_load_private_rsa1: RSA_blinding_on failed"); | |
441 | goto fail; | |
442 | } | |
81333640 | 443 | close(fd); |
aeaa3d9e | 444 | return prv; |
445 | ||
446 | fail: | |
447 | if (commentp) | |
448 | xfree(*commentp); | |
449 | close(fd); | |
450 | key_free(prv); | |
451 | return NULL; | |
8efc0c15 | 452 | } |
a306f2dd | 453 | |
39c00dc2 | 454 | Key * |
aeaa3d9e | 455 | key_load_private_pem(int fd, int type, const char *passphrase, |
456 | char **commentp) | |
a306f2dd | 457 | { |
a306f2dd | 458 | FILE *fp; |
fa08c86b | 459 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 460 | Key *prv = NULL; |
fa08c86b | 461 | char *name = "<no key>"; |
a306f2dd | 462 | |
a306f2dd | 463 | fp = fdopen(fd, "r"); |
464 | if (fp == NULL) { | |
58cfa257 | 465 | error("fdopen failed: %s", strerror(errno)); |
81333640 | 466 | close(fd); |
aeaa3d9e | 467 | return NULL; |
a306f2dd | 468 | } |
fa08c86b | 469 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
470 | if (pk == NULL) { | |
ae88ea7e | 471 | debug("PEM_read_PrivateKey failed"); |
fa08c86b | 472 | (void)ERR_get_error(); |
aeaa3d9e | 473 | } else if (pk->type == EVP_PKEY_RSA && |
184eed6a | 474 | (type == KEY_UNSPEC||type==KEY_RSA)) { |
aeaa3d9e | 475 | prv = key_new(KEY_UNSPEC); |
476 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
477 | prv->type = KEY_RSA; | |
478 | name = "rsa w/o comment"; | |
fa08c86b | 479 | #ifdef DEBUG_PK |
aeaa3d9e | 480 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 481 | #endif |
15e98f49 | 482 | if (RSA_blinding_on(prv->rsa, NULL) != 1) { |
483 | error("key_load_private_pem: RSA_blinding_on failed"); | |
484 | key_free(prv); | |
485 | prv = NULL; | |
486 | } | |
aeaa3d9e | 487 | } else if (pk->type == EVP_PKEY_DSA && |
184eed6a | 488 | (type == KEY_UNSPEC||type==KEY_DSA)) { |
aeaa3d9e | 489 | prv = key_new(KEY_UNSPEC); |
490 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
491 | prv->type = KEY_DSA; | |
492 | name = "dsa w/o comment"; | |
fa08c86b | 493 | #ifdef DEBUG_PK |
aeaa3d9e | 494 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 495 | #endif |
fa08c86b | 496 | } else { |
497 | error("PEM_read_PrivateKey: mismatch or " | |
498 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 499 | } |
a306f2dd | 500 | fclose(fp); |
fa08c86b | 501 | if (pk != NULL) |
502 | EVP_PKEY_free(pk); | |
aeaa3d9e | 503 | if (prv != NULL && commentp) |
504 | *commentp = xstrdup(name); | |
505 | debug("read PEM private key done: type %s", | |
506 | prv ? key_type(prv) : "<unknown>"); | |
507 | return prv; | |
a306f2dd | 508 | } |
509 | ||
396c147e | 510 | static int |
aeaa3d9e | 511 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 512 | { |
a306f2dd | 513 | struct stat st; |
514 | ||
d842a5eb | 515 | if (fstat(fd, &st) < 0) |
516 | return 0; | |
517 | /* | |
518 | * if a key owned by the user is accessed, then we check the | |
519 | * permissions of the file. if the key owned by a different user, | |
520 | * then we don't care. | |
521 | */ | |
9cd45ea4 | 522 | #ifdef HAVE_CYGWIN |
22d89d24 | 523 | if (check_ntsec(filename)) |
9cd45ea4 | 524 | #endif |
d842a5eb | 525 | if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
a306f2dd | 526 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
527 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
528 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
d842a5eb | 529 | error("Permissions 0%3.3o for '%s' are too open.", |
b9ed513a | 530 | (u_int)st.st_mode & 0777, filename); |
a306f2dd | 531 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 532 | error("This private key will be ignored."); |
a306f2dd | 533 | return 0; |
534 | } | |
aeaa3d9e | 535 | return 1; |
536 | } | |
81333640 | 537 | |
aeaa3d9e | 538 | Key * |
539 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
540 | char **commentp) | |
541 | { | |
542 | int fd; | |
543 | ||
544 | fd = open(filename, O_RDONLY); | |
545 | if (fd < 0) | |
546 | return NULL; | |
547 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 548 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 549 | close(fd); |
550 | return NULL; | |
551 | } | |
552 | switch (type) { | |
553 | case KEY_RSA1: | |
554 | return key_load_private_rsa1(fd, filename, passphrase, | |
555 | commentp); | |
556 | /* closes fd */ | |
a306f2dd | 557 | break; |
558 | case KEY_DSA: | |
fa08c86b | 559 | case KEY_RSA: |
560 | case KEY_UNSPEC: | |
aeaa3d9e | 561 | return key_load_private_pem(fd, type, passphrase, commentp); |
562 | /* closes fd */ | |
81333640 | 563 | break; |
a306f2dd | 564 | default: |
81333640 | 565 | close(fd); |
a306f2dd | 566 | break; |
567 | } | |
aeaa3d9e | 568 | return NULL; |
569 | } | |
570 | ||
571 | Key * | |
572 | key_load_private(const char *filename, const char *passphrase, | |
573 | char **commentp) | |
574 | { | |
eb2e1595 | 575 | Key *pub, *prv; |
aeaa3d9e | 576 | int fd; |
577 | ||
578 | fd = open(filename, O_RDONLY); | |
579 | if (fd < 0) | |
580 | return NULL; | |
581 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 582 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 583 | close(fd); |
584 | return NULL; | |
585 | } | |
586 | pub = key_load_public_rsa1(fd, filename, commentp); | |
587 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
588 | if (pub == NULL) { | |
589 | /* closes fd */ | |
eb2e1595 | 590 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
591 | /* use the filename as a comment for PEM */ | |
592 | if (commentp && prv) | |
a10bdd7c | 593 | *commentp = xstrdup(filename); |
aeaa3d9e | 594 | } else { |
595 | /* it's a SSH v1 key if the public key part is readable */ | |
596 | key_free(pub); | |
597 | /* closes fd */ | |
eb2e1595 | 598 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
aeaa3d9e | 599 | } |
eb2e1595 | 600 | return prv; |
a306f2dd | 601 | } |
bcbf86ec | 602 | |
396c147e | 603 | static int |
aeaa3d9e | 604 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 605 | { |
606 | FILE *f; | |
ea067773 | 607 | char line[SSH_MAX_PUBKEY_BYTES]; |
bcbf86ec | 608 | char *cp; |
41feb690 | 609 | u_long linenum = 0; |
bcbf86ec | 610 | |
611 | f = fopen(filename, "r"); | |
612 | if (f != NULL) { | |
ea067773 | 613 | while (read_keyfile_line(f, filename, line, sizeof(line), |
614 | &linenum) != -1) { | |
bcbf86ec | 615 | cp = line; |
6aacefa7 | 616 | switch (*cp) { |
bcbf86ec | 617 | case '#': |
618 | case '\n': | |
619 | case '\0': | |
620 | continue; | |
621 | } | |
622 | /* Skip leading whitespace. */ | |
623 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
624 | ; | |
625 | if (*cp) { | |
fa08c86b | 626 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 627 | if (commentp) |
628 | *commentp=xstrdup(filename); | |
629 | fclose(f); | |
630 | return 1; | |
631 | } | |
632 | } | |
633 | } | |
634 | fclose(f); | |
635 | } | |
636 | return 0; | |
637 | } | |
638 | ||
aeaa3d9e | 639 | /* load public key from ssh v1 private or any pubkey file */ |
640 | Key * | |
641 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 642 | { |
aeaa3d9e | 643 | Key *pub; |
644 | char file[MAXPATHLEN]; | |
645 | ||
3566c73c | 646 | /* try rsa1 private key */ |
aeaa3d9e | 647 | pub = key_load_public_type(KEY_RSA1, filename, commentp); |
648 | if (pub != NULL) | |
649 | return pub; | |
3566c73c | 650 | |
651 | /* try rsa1 public key */ | |
652 | pub = key_new(KEY_RSA1); | |
653 | if (key_try_load_public(pub, filename, commentp) == 1) | |
654 | return pub; | |
655 | key_free(pub); | |
656 | ||
657 | /* try ssh2 public key */ | |
aeaa3d9e | 658 | pub = key_new(KEY_UNSPEC); |
659 | if (key_try_load_public(pub, filename, commentp) == 1) | |
660 | return pub; | |
661 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
662 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
663 | (key_try_load_public(pub, file, commentp) == 1)) | |
664 | return pub; | |
665 | key_free(pub); | |
666 | return NULL; | |
bcbf86ec | 667 | } |