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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" | |
396c147e | 39 | RCSID("$OpenBSD: authfile.c,v 1.37 2001/06/23 15:12:17 itojun 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 | |
396c147e | 65 | static 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); | |
449c5ba5 | 128 | buffer_put_cstring(&encrypted, comment); |
5260325f | 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); |
58cfa257 | 143 | if (fd < 0) { |
144 | error("open %s failed: %s.", filename, strerror(errno)); | |
5260325f | 145 | return 0; |
58cfa257 | 146 | } |
a408af76 | 147 | if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
5260325f | 148 | buffer_len(&encrypted)) { |
58cfa257 | 149 | error("write to key file %s failed: %s", filename, |
5260325f | 150 | strerror(errno)); |
151 | buffer_free(&encrypted); | |
a408af76 | 152 | close(fd); |
77bb0bca | 153 | unlink(filename); |
5260325f | 154 | return 0; |
155 | } | |
a408af76 | 156 | close(fd); |
5260325f | 157 | buffer_free(&encrypted); |
158 | return 1; | |
8efc0c15 | 159 | } |
160 | ||
aeaa3d9e | 161 | /* save SSH v2 key in OpenSSL PEM format */ |
396c147e | 162 | static int |
aeaa3d9e | 163 | key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
164 | const char *comment) | |
a306f2dd | 165 | { |
166 | FILE *fp; | |
167 | int fd; | |
fa08c86b | 168 | int success = 0; |
169 | int len = strlen(_passphrase); | |
170 | char *passphrase = (len > 0) ? (char *)_passphrase : NULL; | |
171 | EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; | |
a306f2dd | 172 | |
173 | if (len > 0 && len <= 4) { | |
58cfa257 | 174 | error("passphrase too short: have %d bytes, need > 4", len); |
a306f2dd | 175 | return 0; |
176 | } | |
177 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); | |
178 | if (fd < 0) { | |
58cfa257 | 179 | error("open %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 180 | return 0; |
181 | } | |
182 | fp = fdopen(fd, "w"); | |
183 | if (fp == NULL ) { | |
58cfa257 | 184 | error("fdopen %s failed: %s.", filename, strerror(errno)); |
a306f2dd | 185 | close(fd); |
186 | return 0; | |
187 | } | |
fa08c86b | 188 | switch (key->type) { |
569807fb | 189 | case KEY_DSA: |
190 | success = PEM_write_DSAPrivateKey(fp, key->dsa, | |
191 | cipher, passphrase, len, NULL, NULL); | |
192 | break; | |
193 | case KEY_RSA: | |
194 | success = PEM_write_RSAPrivateKey(fp, key->rsa, | |
195 | cipher, passphrase, len, NULL, NULL); | |
196 | break; | |
a306f2dd | 197 | } |
198 | fclose(fp); | |
199 | return success; | |
200 | } | |
201 | ||
202 | int | |
aeaa3d9e | 203 | key_save_private(Key *key, const char *filename, const char *passphrase, |
a306f2dd | 204 | const char *comment) |
205 | { | |
206 | switch (key->type) { | |
fa08c86b | 207 | case KEY_RSA1: |
aeaa3d9e | 208 | return key_save_private_rsa1(key, filename, passphrase, |
209 | comment); | |
a306f2dd | 210 | break; |
211 | case KEY_DSA: | |
fa08c86b | 212 | case KEY_RSA: |
aeaa3d9e | 213 | return key_save_private_pem(key, filename, passphrase, |
214 | comment); | |
a306f2dd | 215 | break; |
216 | default: | |
217 | break; | |
218 | } | |
58cfa257 | 219 | error("key_save_private: cannot save key type %d", key->type); |
a306f2dd | 220 | return 0; |
221 | } | |
222 | ||
aa3378df | 223 | /* |
aeaa3d9e | 224 | * Loads the public part of the ssh v1 key file. Returns NULL if an error was |
225 | * encountered (the file does not exist or is not readable), and the key | |
aa3378df | 226 | * otherwise. |
227 | */ | |
8efc0c15 | 228 | |
396c147e | 229 | static Key * |
aeaa3d9e | 230 | key_load_public_rsa1(int fd, const char *filename, char **commentp) |
8efc0c15 | 231 | { |
5260325f | 232 | Buffer buffer; |
aeaa3d9e | 233 | Key *pub; |
5260325f | 234 | char *cp; |
aeaa3d9e | 235 | int i; |
236 | off_t len; | |
5260325f | 237 | |
a408af76 | 238 | len = lseek(fd, (off_t) 0, SEEK_END); |
239 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 240 | |
241 | buffer_init(&buffer); | |
242 | buffer_append_space(&buffer, &cp, len); | |
243 | ||
a408af76 | 244 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 245 | debug("Read from key file %.200s failed: %.100s", filename, |
a306f2dd | 246 | strerror(errno)); |
5260325f | 247 | buffer_free(&buffer); |
aeaa3d9e | 248 | return NULL; |
5260325f | 249 | } |
5260325f | 250 | |
7e2183c0 | 251 | /* Check that it is at least big enough to contain the ID string. */ |
252 | if (len < sizeof(authfile_id_string)) { | |
58cfa257 | 253 | debug3("No RSA1 key file %.200s.", filename); |
5260325f | 254 | buffer_free(&buffer); |
aeaa3d9e | 255 | return NULL; |
5260325f | 256 | } |
aa3378df | 257 | /* |
258 | * Make sure it begins with the id string. Consume the id string | |
259 | * from the buffer. | |
260 | */ | |
7e2183c0 | 261 | for (i = 0; i < sizeof(authfile_id_string); i++) |
262 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
58cfa257 | 263 | debug3("No RSA1 key file %.200s.", filename); |
5260325f | 264 | buffer_free(&buffer); |
aeaa3d9e | 265 | return NULL; |
5260325f | 266 | } |
267 | /* Skip cipher type and reserved data. */ | |
268 | (void) buffer_get_char(&buffer); /* cipher type */ | |
269 | (void) buffer_get_int(&buffer); /* reserved */ | |
270 | ||
271 | /* Read the public key from the buffer. */ | |
272 | buffer_get_int(&buffer); | |
aeaa3d9e | 273 | pub = key_new(KEY_RSA1); |
274 | buffer_get_bignum(&buffer, pub->rsa->n); | |
275 | buffer_get_bignum(&buffer, pub->rsa->e); | |
276 | if (commentp) | |
277 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 278 | /* The encrypted private part is not parsed by this function. */ |
279 | ||
8efc0c15 | 280 | buffer_free(&buffer); |
aeaa3d9e | 281 | return pub; |
8efc0c15 | 282 | } |
283 | ||
aeaa3d9e | 284 | /* load public key from private-key file, works only for SSH v1 */ |
285 | Key * | |
286 | key_load_public_type(int type, const char *filename, char **commentp) | |
a306f2dd | 287 | { |
aeaa3d9e | 288 | Key *pub; |
289 | int fd; | |
290 | ||
291 | if (type == KEY_RSA1) { | |
292 | fd = open(filename, O_RDONLY); | |
293 | if (fd < 0) | |
294 | return NULL; | |
295 | pub = key_load_public_rsa1(fd, filename, commentp); | |
296 | close(fd); | |
297 | return pub; | |
a306f2dd | 298 | } |
aeaa3d9e | 299 | return NULL; |
a306f2dd | 300 | } |
301 | ||
aa3378df | 302 | /* |
303 | * Loads the private key from the file. Returns 0 if an error is encountered | |
304 | * (file does not exist or is not readable, or passphrase is bad). This | |
305 | * initializes the private key. | |
306 | * Assumes we are called under uid of the owner of the file. | |
307 | */ | |
8efc0c15 | 308 | |
396c147e | 309 | static Key * |
aeaa3d9e | 310 | key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
311 | char **commentp) | |
8efc0c15 | 312 | { |
a306f2dd | 313 | int i, check1, check2, cipher_type; |
5260325f | 314 | off_t len; |
315 | Buffer buffer, decrypted; | |
316 | char *cp; | |
94ec8c6b | 317 | CipherContext ciphercontext; |
318 | Cipher *cipher; | |
5260325f | 319 | BN_CTX *ctx; |
320 | BIGNUM *aux; | |
aeaa3d9e | 321 | Key *prv = NULL; |
5260325f | 322 | |
a408af76 | 323 | len = lseek(fd, (off_t) 0, SEEK_END); |
324 | lseek(fd, (off_t) 0, SEEK_SET); | |
5260325f | 325 | |
326 | buffer_init(&buffer); | |
327 | buffer_append_space(&buffer, &cp, len); | |
328 | ||
a408af76 | 329 | if (read(fd, cp, (size_t) len) != (size_t) len) { |
5260325f | 330 | debug("Read from key file %.200s failed: %.100s", filename, |
fa08c86b | 331 | strerror(errno)); |
5260325f | 332 | buffer_free(&buffer); |
a408af76 | 333 | close(fd); |
aeaa3d9e | 334 | return NULL; |
5260325f | 335 | } |
5260325f | 336 | |
7e2183c0 | 337 | /* Check that it is at least big enough to contain the ID string. */ |
338 | if (len < sizeof(authfile_id_string)) { | |
58cfa257 | 339 | debug3("No RSA1 key file %.200s.", filename); |
5260325f | 340 | buffer_free(&buffer); |
81333640 | 341 | close(fd); |
aeaa3d9e | 342 | return NULL; |
5260325f | 343 | } |
aa3378df | 344 | /* |
345 | * Make sure it begins with the id string. Consume the id string | |
346 | * from the buffer. | |
347 | */ | |
7e2183c0 | 348 | for (i = 0; i < sizeof(authfile_id_string); i++) |
349 | if (buffer_get_char(&buffer) != authfile_id_string[i]) { | |
58cfa257 | 350 | debug3("No RSA1 key file %.200s.", filename); |
5260325f | 351 | buffer_free(&buffer); |
81333640 | 352 | close(fd); |
aeaa3d9e | 353 | return NULL; |
5260325f | 354 | } |
81333640 | 355 | |
5260325f | 356 | /* Read cipher type. */ |
357 | cipher_type = buffer_get_char(&buffer); | |
358 | (void) buffer_get_int(&buffer); /* Reserved data. */ | |
359 | ||
360 | /* Read the public key from the buffer. */ | |
361 | buffer_get_int(&buffer); | |
aeaa3d9e | 362 | prv = key_new_private(KEY_RSA1); |
363 | ||
364 | buffer_get_bignum(&buffer, prv->rsa->n); | |
365 | buffer_get_bignum(&buffer, prv->rsa->e); | |
366 | if (commentp) | |
367 | *commentp = buffer_get_string(&buffer, NULL); | |
5260325f | 368 | else |
369 | xfree(buffer_get_string(&buffer, NULL)); | |
370 | ||
371 | /* Check that it is a supported cipher. */ | |
94ec8c6b | 372 | cipher = cipher_by_number(cipher_type); |
373 | if (cipher == NULL) { | |
374 | debug("Unsupported cipher %d used in key file %.200s.", | |
375 | cipher_type, filename); | |
5260325f | 376 | buffer_free(&buffer); |
377 | goto fail; | |
378 | } | |
379 | /* Initialize space for decrypted data. */ | |
380 | buffer_init(&decrypted); | |
381 | buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); | |
382 | ||
383 | /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ | |
94ec8c6b | 384 | cipher_set_key_string(&ciphercontext, cipher, passphrase); |
1e3b8b07 | 385 | cipher_decrypt(&ciphercontext, (u_char *) cp, |
386 | (u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); | |
94ec8c6b | 387 | memset(&ciphercontext, 0, sizeof(ciphercontext)); |
8efc0c15 | 388 | buffer_free(&buffer); |
5260325f | 389 | |
390 | check1 = buffer_get_char(&decrypted); | |
391 | check2 = buffer_get_char(&decrypted); | |
392 | if (check1 != buffer_get_char(&decrypted) || | |
393 | check2 != buffer_get_char(&decrypted)) { | |
394 | if (strcmp(passphrase, "") != 0) | |
aeaa3d9e | 395 | debug("Bad passphrase supplied for key file %.200s.", |
396 | filename); | |
5260325f | 397 | /* Bad passphrase. */ |
398 | buffer_free(&decrypted); | |
aeaa3d9e | 399 | goto fail; |
5260325f | 400 | } |
401 | /* Read the rest of the private key. */ | |
aeaa3d9e | 402 | buffer_get_bignum(&decrypted, prv->rsa->d); |
403 | buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ | |
404 | /* in SSL and SSH v1 p and q are exchanged */ | |
405 | buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ | |
406 | buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ | |
5260325f | 407 | |
aeaa3d9e | 408 | /* calculate p-1 and q-1 */ |
5260325f | 409 | ctx = BN_CTX_new(); |
410 | aux = BN_new(); | |
411 | ||
aeaa3d9e | 412 | BN_sub(aux, prv->rsa->q, BN_value_one()); |
413 | BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx); | |
5260325f | 414 | |
aeaa3d9e | 415 | BN_sub(aux, prv->rsa->p, BN_value_one()); |
416 | BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx); | |
5260325f | 417 | |
418 | BN_clear_free(aux); | |
419 | BN_CTX_free(ctx); | |
420 | ||
421 | buffer_free(&decrypted); | |
81333640 | 422 | close(fd); |
aeaa3d9e | 423 | return prv; |
424 | ||
425 | fail: | |
426 | if (commentp) | |
427 | xfree(*commentp); | |
428 | close(fd); | |
429 | key_free(prv); | |
430 | return NULL; | |
8efc0c15 | 431 | } |
a306f2dd | 432 | |
396c147e | 433 | static Key * |
aeaa3d9e | 434 | key_load_private_pem(int fd, int type, const char *passphrase, |
435 | char **commentp) | |
a306f2dd | 436 | { |
a306f2dd | 437 | FILE *fp; |
fa08c86b | 438 | EVP_PKEY *pk = NULL; |
aeaa3d9e | 439 | Key *prv = NULL; |
fa08c86b | 440 | char *name = "<no key>"; |
a306f2dd | 441 | |
a306f2dd | 442 | fp = fdopen(fd, "r"); |
443 | if (fp == NULL) { | |
58cfa257 | 444 | error("fdopen failed: %s", strerror(errno)); |
81333640 | 445 | close(fd); |
aeaa3d9e | 446 | return NULL; |
a306f2dd | 447 | } |
fa08c86b | 448 | pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
449 | if (pk == NULL) { | |
ae88ea7e | 450 | debug("PEM_read_PrivateKey failed"); |
fa08c86b | 451 | (void)ERR_get_error(); |
aeaa3d9e | 452 | } else if (pk->type == EVP_PKEY_RSA && |
453 | (type == KEY_UNSPEC||type==KEY_RSA)) { | |
454 | prv = key_new(KEY_UNSPEC); | |
455 | prv->rsa = EVP_PKEY_get1_RSA(pk); | |
456 | prv->type = KEY_RSA; | |
457 | name = "rsa w/o comment"; | |
fa08c86b | 458 | #ifdef DEBUG_PK |
aeaa3d9e | 459 | RSA_print_fp(stderr, prv->rsa, 8); |
fa08c86b | 460 | #endif |
aeaa3d9e | 461 | } else if (pk->type == EVP_PKEY_DSA && |
462 | (type == KEY_UNSPEC||type==KEY_DSA)) { | |
463 | prv = key_new(KEY_UNSPEC); | |
464 | prv->dsa = EVP_PKEY_get1_DSA(pk); | |
465 | prv->type = KEY_DSA; | |
466 | name = "dsa w/o comment"; | |
fa08c86b | 467 | #ifdef DEBUG_PK |
aeaa3d9e | 468 | DSA_print_fp(stderr, prv->dsa, 8); |
fa08c86b | 469 | #endif |
fa08c86b | 470 | } else { |
471 | error("PEM_read_PrivateKey: mismatch or " | |
472 | "unknown EVP_PKEY save_type %d", pk->save_type); | |
a306f2dd | 473 | } |
a306f2dd | 474 | fclose(fp); |
fa08c86b | 475 | if (pk != NULL) |
476 | EVP_PKEY_free(pk); | |
aeaa3d9e | 477 | if (prv != NULL && commentp) |
478 | *commentp = xstrdup(name); | |
479 | debug("read PEM private key done: type %s", | |
480 | prv ? key_type(prv) : "<unknown>"); | |
481 | return prv; | |
a306f2dd | 482 | } |
483 | ||
396c147e | 484 | static int |
aeaa3d9e | 485 | key_perm_ok(int fd, const char *filename) |
a306f2dd | 486 | { |
a306f2dd | 487 | struct stat st; |
488 | ||
22d89d24 | 489 | /* check owner and modes */ |
9cd45ea4 | 490 | #ifdef HAVE_CYGWIN |
22d89d24 | 491 | if (check_ntsec(filename)) |
9cd45ea4 | 492 | #endif |
a306f2dd | 493 | if (fstat(fd, &st) < 0 || |
1e3b8b07 | 494 | (st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) || |
a306f2dd | 495 | (st.st_mode & 077) != 0) { |
496 | close(fd); | |
497 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
498 | error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); | |
499 | error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); | |
500 | error("Bad ownership or mode(0%3.3o) for '%s'.", | |
81333640 | 501 | st.st_mode & 0777, filename); |
a306f2dd | 502 | error("It is recommended that your private key files are NOT accessible by others."); |
aeaa3d9e | 503 | error("This private key will be ignored."); |
a306f2dd | 504 | return 0; |
505 | } | |
aeaa3d9e | 506 | return 1; |
507 | } | |
81333640 | 508 | |
aeaa3d9e | 509 | Key * |
510 | key_load_private_type(int type, const char *filename, const char *passphrase, | |
511 | char **commentp) | |
512 | { | |
513 | int fd; | |
514 | ||
515 | fd = open(filename, O_RDONLY); | |
516 | if (fd < 0) | |
517 | return NULL; | |
518 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 519 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 520 | close(fd); |
521 | return NULL; | |
522 | } | |
523 | switch (type) { | |
524 | case KEY_RSA1: | |
525 | return key_load_private_rsa1(fd, filename, passphrase, | |
526 | commentp); | |
527 | /* closes fd */ | |
a306f2dd | 528 | break; |
529 | case KEY_DSA: | |
fa08c86b | 530 | case KEY_RSA: |
531 | case KEY_UNSPEC: | |
aeaa3d9e | 532 | return key_load_private_pem(fd, type, passphrase, commentp); |
533 | /* closes fd */ | |
81333640 | 534 | break; |
a306f2dd | 535 | default: |
81333640 | 536 | close(fd); |
a306f2dd | 537 | break; |
538 | } | |
aeaa3d9e | 539 | return NULL; |
540 | } | |
541 | ||
542 | Key * | |
543 | key_load_private(const char *filename, const char *passphrase, | |
544 | char **commentp) | |
545 | { | |
eb2e1595 | 546 | Key *pub, *prv; |
aeaa3d9e | 547 | int fd; |
548 | ||
549 | fd = open(filename, O_RDONLY); | |
550 | if (fd < 0) | |
551 | return NULL; | |
552 | if (!key_perm_ok(fd, filename)) { | |
58cfa257 | 553 | error("bad permissions: ignore key: %s", filename); |
aeaa3d9e | 554 | close(fd); |
555 | return NULL; | |
556 | } | |
557 | pub = key_load_public_rsa1(fd, filename, commentp); | |
558 | lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ | |
559 | if (pub == NULL) { | |
560 | /* closes fd */ | |
eb2e1595 | 561 | prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
562 | /* use the filename as a comment for PEM */ | |
563 | if (commentp && prv) | |
a10bdd7c | 564 | *commentp = xstrdup(filename); |
aeaa3d9e | 565 | } else { |
566 | /* it's a SSH v1 key if the public key part is readable */ | |
567 | key_free(pub); | |
568 | /* closes fd */ | |
eb2e1595 | 569 | prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
aeaa3d9e | 570 | } |
eb2e1595 | 571 | return prv; |
a306f2dd | 572 | } |
bcbf86ec | 573 | |
396c147e | 574 | static int |
aeaa3d9e | 575 | key_try_load_public(Key *k, const char *filename, char **commentp) |
bcbf86ec | 576 | { |
577 | FILE *f; | |
aeaa3d9e | 578 | char line[4096]; |
bcbf86ec | 579 | char *cp; |
580 | ||
581 | f = fopen(filename, "r"); | |
582 | if (f != NULL) { | |
583 | while (fgets(line, sizeof(line), f)) { | |
584 | line[sizeof(line)-1] = '\0'; | |
585 | cp = line; | |
586 | switch(*cp){ | |
587 | case '#': | |
588 | case '\n': | |
589 | case '\0': | |
590 | continue; | |
591 | } | |
592 | /* Skip leading whitespace. */ | |
593 | for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) | |
594 | ; | |
595 | if (*cp) { | |
fa08c86b | 596 | if (key_read(k, &cp) == 1) { |
bcbf86ec | 597 | if (commentp) |
598 | *commentp=xstrdup(filename); | |
599 | fclose(f); | |
600 | return 1; | |
601 | } | |
602 | } | |
603 | } | |
604 | fclose(f); | |
605 | } | |
606 | return 0; | |
607 | } | |
608 | ||
aeaa3d9e | 609 | /* load public key from ssh v1 private or any pubkey file */ |
610 | Key * | |
611 | key_load_public(const char *filename, char **commentp) | |
bcbf86ec | 612 | { |
aeaa3d9e | 613 | Key *pub; |
614 | char file[MAXPATHLEN]; | |
615 | ||
616 | pub = key_load_public_type(KEY_RSA1, filename, commentp); | |
617 | if (pub != NULL) | |
618 | return pub; | |
619 | pub = key_new(KEY_UNSPEC); | |
620 | if (key_try_load_public(pub, filename, commentp) == 1) | |
621 | return pub; | |
622 | if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && | |
623 | (strlcat(file, ".pub", sizeof file) < sizeof(file)) && | |
624 | (key_try_load_public(pub, file, commentp) == 1)) | |
625 | return pub; | |
626 | key_free(pub); | |
627 | return NULL; | |
bcbf86ec | 628 | } |