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