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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" | |
569807fb | 39 | RCSID("$OpenBSD: authfile.c,v 1.30 2001/03/26 23:12:42 markus 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" |
8efc0c15 | 53 | |
aeaa3d9e | 54 | /* Version identification string for SSH v1 identity files. */ |
7e2183c0 | 55 | static const char authfile_id_string[] = |
56 | "SSH PRIVATE KEY FILE FORMAT 1.1\n"; | |
8efc0c15 | 57 | |
aa3378df | 58 | /* |
59 | * Saves the authentication (private) key in a file, encrypting it with | |
60 | * passphrase. The identification of the file (lowest 64 bits of n) will | |
61 | * precede the key to provide identification of the key without needing a | |
62 | * passphrase. | |
63 | */ | |
8efc0c15 | 64 | |
65 | int | |
aeaa3d9e | 66 | key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
67 | const char *comment) | |
8efc0c15 | 68 | { |
5260325f | 69 | Buffer buffer, encrypted; |
70 | char buf[100], *cp; | |
a408af76 | 71 | int fd, i; |
94ec8c6b | 72 | CipherContext ciphercontext; |
73 | Cipher *cipher; | |
5260325f | 74 | u_int32_t rand; |
75 | ||
aa3378df | 76 | /* |
77 | * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting | |
78 | * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. | |
79 | */ | |
5260325f | 80 | if (strcmp(passphrase, "") == 0) |
94ec8c6b | 81 | cipher = cipher_by_number(SSH_CIPHER_NONE); |
5260325f | 82 | else |
94ec8c6b | 83 | cipher = cipher_by_number(SSH_AUTHFILE_CIPHER); |
84 | if (cipher == NULL) | |
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. */ | |
91 | rand = arc4random(); | |
92 | buf[0] = rand & 0xff; | |
93 | buf[1] = (rand >> 8) & 0xff; | |
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. */ | |
94ec8c6b | 121 | buffer_put_char(&encrypted, cipher->number); |
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); | |
5260325f | 128 | buffer_put_string(&encrypted, comment, strlen(comment)); |
129 | ||
130 | /* Allocate space for the private part of the key in the buffer. */ | |
131 | buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); | |
132 | ||
94ec8c6b | 133 | cipher_set_key_string(&ciphercontext, cipher, passphrase); |
1e3b8b07 | 134 | cipher_encrypt(&ciphercontext, (u_char *) cp, |
135 | (u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); | |
94ec8c6b | 136 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
5260325f | 137 | |
138 | /* Destroy temporary data. */ | |
139 | memset(buf, 0, sizeof(buf)); | |
140 | buffer_free(&buffer); | |
141 | ||
a408af76 | 142 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
143 | if (fd < 0) | |
5260325f | 144 | return 0; |
a408af76 | 145 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
5260325f | 146 | buffer_len(&encrypted)) { |
147 | debug("Write to key file %.200s failed: %.100s", filename, | |
148 | strerror(errno)); | |
149 | buffer_free(&encrypted); | |
a408af76 | 150 | close(fd); |
77bb0bca | 151 | unlink(filename); |
5260325f | 152 | return 0; |
153 | } | |
a408af76 | 154 | close(fd); |
5260325f | 155 | buffer_free(&encrypted); |
156 | return 1; | |
8efc0c15 | 157 | } |
158 | ||
aeaa3d9e | 159 | /* save SSH v2 key in OpenSSL PEM format */ |
a306f2dd | 160 | int |
aeaa3d9e | 161 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
162 | const char *comment) | |
a306f2dd | 163 | { |
164 | FILE *fp; | |
165 | int fd; | |
fa08c86b | 166 | int success = 0; |
167 | int len = strlen(_passphrase); | |
168 | char *passphrase = (len > 0) ? (char *)_passphrase : NULL; | |
169 | EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; | |
a306f2dd | 170 | |
171 | if (len > 0 && len <= 4) { | |
172 | error("passphrase too short: %d bytes", len); | |
173 | errno = 0; | |
174 | return 0; | |
175 | } | |
176 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
177 | if (fd < 0) { | |
178 | debug("open %s failed", filename); | |
179 | return 0; | |
180 | } | |
181 | fp = fdopen(fd, "w"); | |
182 | if (fp == NULL ) { | |
183 | debug("fdopen %s failed", filename); | |
184 | close(fd); | |
185 | return 0; | |
186 | } | |
fa08c86b | 187 | switch (key->type) { |
569807fb | 188 | case KEY_DSA: |
189 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
190 | cipher, passphrase, len, NULL, NULL); | |
191 | break; | |
192 | case KEY_RSA: | |
193 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
194 | cipher, passphrase, len, NULL, NULL); | |
195 | break; | |
a306f2dd | 196 | } |
197 | fclose(fp); | |
198 | return success; | |
199 | } | |
200 | ||
201 | int | |
aeaa3d9e | 202 | key_save_private(Key *key, const char *filename, const char *passphrase, |
a306f2dd | 203 | const char *comment) |
204 | { | |
205 | switch (key->type) { | |
fa08c86b | 206 | case KEY_RSA1: |
aeaa3d9e | 207 | return key_save_private_rsa1(key, filename, passphrase, |
208 | comment); | |
a306f2dd | 209 | break; |
210 | case KEY_DSA: | |
fa08c86b | 211 | case KEY_RSA: |
aeaa3d9e | 212 | return key_save_private_pem(key, filename, passphrase, |
213 | comment); | |
a306f2dd | 214 | break; |
215 | default: | |
216 | break; | |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
aa3378df | 221 | /* |
aeaa3d9e | 222 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
223 | * encountered (the file does not exist or is not readable), and the key | |
aa3378df | 224 | * otherwise. |
225 | */ | |
8efc0c15 | 226 | |
aeaa3d9e | 227 | Key * |
228 | key_load_public_rsa1(int fd, const char *filename, char **commentp) | |
8efc0c15 | 229 | { |
5260325f | 230 | Buffer buffer; |
aeaa3d9e | 231 | Key *pub; |
5260325f | 232 | char *cp; |
aeaa3d9e | 233 | int i; |
234 | off_t len; | |
5260325f | 235 | |
a408af76 | 236 | len = lseek(fd, (off_t) 0, SEEK_END); |
237 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 238 | |
239 | buffer_init(&buffer); | |
240 | buffer_append_space(&buffer, &cp, len); | |
241 | ||
a408af76 | 242 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 243 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 244 | strerror(errno)); |
5260325f | 245 | buffer_free(&buffer); |
aeaa3d9e | 246 | return NULL; |
5260325f | 247 | } |
5260325f | 248 | |
7e2183c0 | 249 | /* Check that it is at least big enough to contain the ID string. */ |
250 | if (len < sizeof(authfile_id_string)) { | |
fa08c86b | 251 | debug3("Bad RSA1 key file %.200s.", filename); |
5260325f | 252 | buffer_free(&buffer); |
aeaa3d9e | 253 | return NULL; |
5260325f | 254 | } |
aa3378df | 255 | /* |
256 | * Make sure it begins with the id string. Consume the id string | |
257 | * from the buffer. | |
258 | */ | |
7e2183c0 | 259 | for (i = 0; i < sizeof(authfile_id_string); i++) |
260 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
fa08c86b | 261 | debug3("Bad RSA1 key file %.200s.", filename); |
5260325f | 262 | buffer_free(&buffer); |
aeaa3d9e | 263 | return NULL; |
5260325f | 264 | } |
265 | /* Skip cipher type and reserved data. */ | |
266 | (void) buffer_get_char(&buffer); /* cipher type */ | |
267 | (void) buffer_get_int(&buffer); /* reserved */ | |
268 | ||
269 | /* Read the public key from the buffer. */ | |
270 | buffer_get_int(&buffer); | |
aeaa3d9e | 271 | pub = key_new(KEY_RSA1); |
272 | buffer_get_bignum(&buffer, pub->rsa->n); | |
273 | buffer_get_bignum(&buffer, pub->rsa->e); | |
274 | if (commentp) | |
275 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 276 | /* The encrypted private part is not parsed by this function. */ |
277 | ||
8efc0c15 | 278 | buffer_free(&buffer); |
aeaa3d9e | 279 | return pub; |
8efc0c15 | 280 | } |
281 | ||
aeaa3d9e | 282 | /* load public key from private-key file, works only for SSH v1 */ |
283 | Key * | |
284 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 285 | { |
aeaa3d9e | 286 | Key *pub; |
287 | int fd; | |
288 | ||
289 | if (type == KEY_RSA1) { | |
290 | fd = open(filename, O_RDONLY); | |
291 | if (fd < 0) | |
292 | return NULL; | |
293 | pub = key_load_public_rsa1(fd, filename, commentp); | |
294 | close(fd); | |
295 | return pub; | |
a306f2dd | 296 | } |
aeaa3d9e | 297 | return NULL; |
a306f2dd | 298 | } |
299 | ||
aa3378df | 300 | /* |
301 | * Loads the private key from the file. Returns 0 if an error is encountered | |
302 | * (file does not exist or is not readable, or passphrase is bad). This | |
303 | * initializes the private key. | |
304 | * Assumes we are called under uid of the owner of the file. | |
305 | */ | |
8efc0c15 | 306 | |
aeaa3d9e | 307 | Key * |
308 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, | |
309 | char **commentp) | |
8efc0c15 | 310 | { |
a306f2dd | 311 | int i, check1, check2, cipher_type; |
5260325f | 312 | off_t len; |
313 | Buffer buffer, decrypted; | |
314 | char *cp; | |
94ec8c6b | 315 | CipherContext ciphercontext; |
316 | Cipher *cipher; | |
5260325f | 317 | BN_CTX *ctx; |
318 | BIGNUM *aux; | |
aeaa3d9e | 319 | Key *prv = NULL; |
5260325f | 320 | |
a408af76 | 321 | len = lseek(fd, (off_t) 0, SEEK_END); |
322 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 323 | |
324 | buffer_init(&buffer); | |
325 | buffer_append_space(&buffer, &cp, len); | |
326 | ||
a408af76 | 327 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 328 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 329 | strerror(errno)); |
5260325f | 330 | buffer_free(&buffer); |
a408af76 | 331 | close(fd); |
aeaa3d9e | 332 | return NULL; |
5260325f | 333 | } |
5260325f | 334 | |
7e2183c0 | 335 | /* Check that it is at least big enough to contain the ID string. */ |
336 | if (len < sizeof(authfile_id_string)) { | |
fa08c86b | 337 | debug3("Bad RSA1 key file %.200s.", filename); |
5260325f | 338 | buffer_free(&buffer); |
81333640 | 339 | close(fd); |
aeaa3d9e | 340 | return NULL; |
5260325f | 341 | } |
aa3378df | 342 | /* |
343 | * Make sure it begins with the id string. Consume the id string | |
344 | * from the buffer. | |
345 | */ | |
7e2183c0 | 346 | for (i = 0; i < sizeof(authfile_id_string); i++) |
347 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
fa08c86b | 348 | debug3("Bad RSA1 key file %.200s.", filename); |
5260325f | 349 | buffer_free(&buffer); |
81333640 | 350 | close(fd); |
aeaa3d9e | 351 | return NULL; |
5260325f | 352 | } |
81333640 | 353 | |
5260325f | 354 | /* Read cipher type. */ |
355 | cipher_type = buffer_get_char(&buffer); | |
356 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
357 | ||
358 | /* Read the public key from the buffer. */ | |
359 | buffer_get_int(&buffer); | |
aeaa3d9e | 360 | prv = key_new_private(KEY_RSA1); |
361 | ||
362 | buffer_get_bignum(&buffer, prv->rsa->n); | |
363 | buffer_get_bignum(&buffer, prv->rsa->e); | |
364 | if (commentp) | |
365 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 366 | else |
367 | xfree(buffer_get_string(&buffer, NULL)); | |
368 | ||
369 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 370 | cipher = cipher_by_number(cipher_type); |
371 | if (cipher == NULL) { | |
372 | debug("Unsupported cipher %d used in key file %.200s.", | |
373 | cipher_type, filename); | |
5260325f | 374 | buffer_free(&buffer); |
375 | goto fail; | |
376 | } | |
377 | /* Initialize space for decrypted data. */ | |
378 | buffer_init(&decrypted); | |
379 | buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); | |
380 | ||
381 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
94ec8c6b | 382 | cipher_set_key_string(&ciphercontext, cipher, passphrase); |
1e3b8b07 | 383 | cipher_decrypt(&ciphercontext, (u_char *) cp, |
384 | (u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); | |
94ec8c6b | 385 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 386 | buffer_free(&buffer); |
5260325f | 387 | |
388 | check1 = buffer_get_char(&decrypted); | |
389 | check2 = buffer_get_char(&decrypted); | |
390 | if (check1 != buffer_get_char(&decrypted) || | |
391 | check2 != buffer_get_char(&decrypted)) { | |
392 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 393 | debug("Bad passphrase supplied for key file %.200s.", |
394 | filename); | |
5260325f | 395 | /* Bad passphrase. */ |
396 | buffer_free(&decrypted); | |
aeaa3d9e | 397 | goto fail; |
5260325f | 398 | } |
399 | /* Read the rest of the private key. */ | |
aeaa3d9e | 400 | buffer_get_bignum(&decrypted, prv->rsa->d); |
401 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
402 | /* in SSL and SSH v1 p and q are exchanged */ | |
403 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
404 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 405 | |
aeaa3d9e | 406 | /* calculate p-1 and q-1 */ |
5260325f | 407 | ctx = BN_CTX_new(); |
408 | aux = BN_new(); | |
409 | ||
aeaa3d9e | 410 | BN_sub(aux, prv->rsa->q, BN_value_one()); |
411 | BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx); | |
5260325f | 412 | |
aeaa3d9e | 413 | BN_sub(aux, prv->rsa->p, BN_value_one()); |
414 | BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx); | |
5260325f | 415 | |
416 | BN_clear_free(aux); | |
417 | BN_CTX_free(ctx); | |
418 | ||
419 | buffer_free(&decrypted); | |
81333640 | 420 | close(fd); |
aeaa3d9e | 421 | return prv; |
422 | ||
423 | fail: | |
424 | if (commentp) | |
425 | xfree(*commentp); | |
426 | close(fd); | |
427 | key_free(prv); | |
428 | return NULL; | |
8efc0c15 | 429 | } |
a306f2dd | 430 | |
aeaa3d9e | 431 | Key * |
432 | key_load_private_pem(int fd, int type, const char *passphrase, | |
433 | char **commentp) | |
a306f2dd | 434 | { |
a306f2dd | 435 | FILE *fp; |
fa08c86b | 436 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 437 | Key *prv = NULL; |
fa08c86b | 438 | char *name = "<no key>"; |
a306f2dd | 439 | |
a306f2dd | 440 | fp = fdopen(fd, "r"); |
441 | if (fp == NULL) { | |
442 | error("fdopen failed"); | |
81333640 | 443 | close(fd); |
aeaa3d9e | 444 | return NULL; |
a306f2dd | 445 | } |
fa08c86b | 446 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
447 | if (pk == NULL) { | |
448 | debug("PEM_read_PrivateKey failed"); | |
449 | (void)ERR_get_error(); | |
aeaa3d9e | 450 | } else if (pk->type == EVP_PKEY_RSA && |
451 | (type == KEY_UNSPEC||type==KEY_RSA)) { | |
452 | prv = key_new(KEY_UNSPEC); | |
453 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
454 | prv->type = KEY_RSA; | |
455 | name = "rsa w/o comment"; | |
fa08c86b | 456 | #ifdef DEBUG_PK |
aeaa3d9e | 457 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 458 | #endif |
aeaa3d9e | 459 | } else if (pk->type == EVP_PKEY_DSA && |
460 | (type == KEY_UNSPEC||type==KEY_DSA)) { | |
461 | prv = key_new(KEY_UNSPEC); | |
462 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
463 | prv->type = KEY_DSA; | |
464 | name = "dsa w/o comment"; | |
fa08c86b | 465 | #ifdef DEBUG_PK |
aeaa3d9e | 466 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 467 | #endif |
fa08c86b | 468 | } else { |
469 | error("PEM_read_PrivateKey: mismatch or " | |
470 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 471 | } |
a306f2dd | 472 | fclose(fp); |
fa08c86b | 473 | if (pk != NULL) |
474 | EVP_PKEY_free(pk); | |
aeaa3d9e | 475 | if (prv != NULL && commentp) |
476 | *commentp = xstrdup(name); | |
477 | debug("read PEM private key done: type %s", | |
478 | prv ? key_type(prv) : "<unknown>"); | |
479 | return prv; | |
a306f2dd | 480 | } |
481 | ||
482 | int | |
aeaa3d9e | 483 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 484 | { |
a306f2dd | 485 | struct stat st; |
486 | ||
22d89d24 | 487 | /* check owner and modes */ |
9cd45ea4 | 488 | #ifdef HAVE_CYGWIN |
22d89d24 | 489 | if (check_ntsec(filename)) |
9cd45ea4 | 490 | #endif |
a306f2dd | 491 | if (fstat(fd, &st) < 0 || |
1e3b8b07 | 492 | (st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) || |
a306f2dd | 493 | (st.st_mode & 077) != 0) { |
494 | close(fd); | |
495 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
496 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
497 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
498 | error("Bad ownership or mode(0%3.3o) for '%s'.", | |
81333640 | 499 | st.st_mode & 0777, filename); |
a306f2dd | 500 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 501 | error("This private key will be ignored."); |
a306f2dd | 502 | return 0; |
503 | } | |
aeaa3d9e | 504 | return 1; |
505 | } | |
81333640 | 506 | |
aeaa3d9e | 507 | Key * |
508 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
509 | char **commentp) | |
510 | { | |
511 | int fd; | |
512 | ||
513 | fd = open(filename, O_RDONLY); | |
514 | if (fd < 0) | |
515 | return NULL; | |
516 | if (!key_perm_ok(fd, filename)) { | |
517 | debug("bad permissions: ignore key: %s", filename); | |
518 | close(fd); | |
519 | return NULL; | |
520 | } | |
521 | switch (type) { | |
522 | case KEY_RSA1: | |
523 | return key_load_private_rsa1(fd, filename, passphrase, | |
524 | commentp); | |
525 | /* closes fd */ | |
a306f2dd | 526 | break; |
527 | case KEY_DSA: | |
fa08c86b | 528 | case KEY_RSA: |
529 | case KEY_UNSPEC: | |
aeaa3d9e | 530 | return key_load_private_pem(fd, type, passphrase, commentp); |
531 | /* closes fd */ | |
81333640 | 532 | break; |
a306f2dd | 533 | default: |
81333640 | 534 | close(fd); |
a306f2dd | 535 | break; |
536 | } | |
aeaa3d9e | 537 | return NULL; |
538 | } | |
539 | ||
540 | Key * | |
541 | key_load_private(const char *filename, const char *passphrase, | |
542 | char **commentp) | |
543 | { | |
544 | Key *pub; | |
545 | int fd; | |
546 | ||
547 | fd = open(filename, O_RDONLY); | |
548 | if (fd < 0) | |
549 | return NULL; | |
550 | if (!key_perm_ok(fd, filename)) { | |
551 | debug("bad permissions: ignore key: %s", filename); | |
552 | close(fd); | |
553 | return NULL; | |
554 | } | |
555 | pub = key_load_public_rsa1(fd, filename, commentp); | |
556 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
557 | if (pub == NULL) { | |
558 | /* closes fd */ | |
559 | return key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); | |
560 | } else { | |
561 | /* it's a SSH v1 key if the public key part is readable */ | |
562 | key_free(pub); | |
563 | /* closes fd */ | |
564 | return key_load_private_rsa1(fd, filename, passphrase, NULL); | |
565 | } | |
a306f2dd | 566 | } |
bcbf86ec | 567 | |
568 | int | |
aeaa3d9e | 569 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 570 | { |
571 | FILE *f; | |
aeaa3d9e | 572 | char line[4096]; |
bcbf86ec | 573 | char *cp; |
574 | ||
575 | f = fopen(filename, "r"); | |
576 | if (f != NULL) { | |
577 | while (fgets(line, sizeof(line), f)) { | |
578 | line[sizeof(line)-1] = '\0'; | |
579 | cp = line; | |
580 | switch(*cp){ | |
581 | case '#': | |
582 | case '\n': | |
583 | case '\0': | |
584 | continue; | |
585 | } | |
586 | /* Skip leading whitespace. */ | |
587 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
588 | ; | |
589 | if (*cp) { | |
fa08c86b | 590 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 591 | if (commentp) |
592 | *commentp=xstrdup(filename); | |
593 | fclose(f); | |
594 | return 1; | |
595 | } | |
596 | } | |
597 | } | |
598 | fclose(f); | |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
aeaa3d9e | 603 | /* load public key from ssh v1 private or any pubkey file */ |
604 | Key * | |
605 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 606 | { |
aeaa3d9e | 607 | Key *pub; |
608 | char file[MAXPATHLEN]; | |
609 | ||
610 | pub = key_load_public_type(KEY_RSA1, filename, commentp); | |
611 | if (pub != NULL) | |
612 | return pub; | |
613 | pub = key_new(KEY_UNSPEC); | |
614 | if (key_try_load_public(pub, filename, commentp) == 1) | |
615 | return pub; | |
616 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
617 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
618 | (key_try_load_public(pub, file, commentp) == 1)) | |
619 | return pub; | |
620 | key_free(pub); | |
621 | return NULL; | |
bcbf86ec | 622 | } |