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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 | |
6ae2364d | 5 | * |
bcbf86ec | 6 | * As far as I am concerned, the code I have written for this software |
7 | * can be used freely for any purpose. Any derived versions of this | |
8 | * software must be clearly marked as such, and if the derived work is | |
9 | * incompatible with the protocol description in the RFC file, it must be | |
10 | * called by a name other than "ssh" or "Secure Shell". | |
11 | * | |
12 | * | |
13 | * Copyright (c) 1999 Niels Provos. All rights reserved. | |
a96070d4 | 14 | * Copyright (c) 1999, 2000 Markus Friedl. All rights reserved. |
bcbf86ec | 15 | * |
16 | * Redistribution and use in source and binary forms, with or without | |
17 | * modification, are permitted provided that the following conditions | |
18 | * are met: | |
19 | * 1. Redistributions of source code must retain the above copyright | |
20 | * notice, this list of conditions and the following disclaimer. | |
21 | * 2. Redistributions in binary form must reproduce the above copyright | |
22 | * notice, this list of conditions and the following disclaimer in the | |
23 | * documentation and/or other materials provided with the distribution. | |
6ae2364d | 24 | * |
bcbf86ec | 25 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
26 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
27 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
28 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
30 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
31 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
32 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
33 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
34 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
5260325f | 35 | */ |
8efc0c15 | 36 | |
37 | #include "includes.h" | |
18ae3c67 | 38 | RCSID("$OpenBSD: cipher.c,v 1.63 2003/04/12 10:13:57 markus Exp $"); |
8efc0c15 | 39 | |
a8be9f80 | 40 | #include "xmalloc.h" |
42f11eb2 | 41 | #include "log.h" |
42 | #include "cipher.h" | |
8efc0c15 | 43 | |
44 | #include <openssl/md5.h> | |
70fc1609 | 45 | |
a068d86f | 46 | #if OPENSSL_VERSION_NUMBER < 0x00906000L |
47 | #define SSH_OLD_EVP | |
48 | #define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data) | |
49 | #endif | |
50 | ||
135247df | 51 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
52 | #include "rijndael.h" | |
53 | static const EVP_CIPHER *evp_rijndael(void); | |
54 | #endif | |
7b5edc2b | 55 | static const EVP_CIPHER *evp_ssh1_3des(void); |
56 | static const EVP_CIPHER *evp_ssh1_bf(void); | |
8efc0c15 | 57 | |
3ee832e5 | 58 | struct Cipher { |
59 | char *name; | |
60 | int number; /* for ssh1 only */ | |
61 | u_int block_size; | |
62 | u_int key_len; | |
7b5edc2b | 63 | const EVP_CIPHER *(*evptype)(void); |
70fc1609 | 64 | } ciphers[] = { |
65 | { "none", SSH_CIPHER_NONE, 8, 0, EVP_enc_null }, | |
66 | { "des", SSH_CIPHER_DES, 8, 8, EVP_des_cbc }, | |
67 | { "3des", SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des }, | |
68 | { "blowfish", SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf }, | |
69 | ||
70 | { "3des-cbc", SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc }, | |
71 | { "blowfish-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc }, | |
72 | { "cast128-cbc", SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc }, | |
73 | { "arcfour", SSH_CIPHER_SSH2, 8, 16, EVP_rc4 }, | |
135247df | 74 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
70fc1609 | 75 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, evp_rijndael }, |
76 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, evp_rijndael }, | |
77 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, | |
bf03f2da | 78 | { "rijndael-cbc@lysator.liu.se", |
79 | SSH_CIPHER_SSH2, 16, 32, evp_rijndael }, | |
135247df | 80 | #else |
81 | { "aes128-cbc", SSH_CIPHER_SSH2, 16, 16, EVP_aes_128_cbc }, | |
82 | { "aes192-cbc", SSH_CIPHER_SSH2, 16, 24, EVP_aes_192_cbc }, | |
83 | { "aes256-cbc", SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, | |
84 | { "rijndael-cbc@lysator.liu.se", | |
85 | SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, | |
86 | #endif | |
70fc1609 | 87 | |
88 | { NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } | |
94ec8c6b | 89 | }; |
90 | ||
91 | /*--*/ | |
92 | ||
762715ce | 93 | u_int |
3ee832e5 | 94 | cipher_blocksize(Cipher *c) |
95 | { | |
96 | return (c->block_size); | |
97 | } | |
3ddc795d | 98 | |
762715ce | 99 | u_int |
3ee832e5 | 100 | cipher_keylen(Cipher *c) |
101 | { | |
102 | return (c->key_len); | |
103 | } | |
3ddc795d | 104 | |
762715ce | 105 | u_int |
bf8269a9 | 106 | cipher_get_number(Cipher *c) |
107 | { | |
108 | return (c->number); | |
109 | } | |
3ee832e5 | 110 | |
1e3b8b07 | 111 | u_int |
94ec8c6b | 112 | cipher_mask_ssh1(int client) |
8ce64345 | 113 | { |
1e3b8b07 | 114 | u_int mask = 0; |
184eed6a | 115 | mask |= 1 << SSH_CIPHER_3DES; /* Mandatory */ |
94ec8c6b | 116 | mask |= 1 << SSH_CIPHER_BLOWFISH; |
117 | if (client) { | |
118 | mask |= 1 << SSH_CIPHER_DES; | |
119 | } | |
5260325f | 120 | return mask; |
8efc0c15 | 121 | } |
94ec8c6b | 122 | |
123 | Cipher * | |
124 | cipher_by_name(const char *name) | |
8ce64345 | 125 | { |
94ec8c6b | 126 | Cipher *c; |
127 | for (c = ciphers; c->name != NULL; c++) | |
128 | if (strcasecmp(c->name, name) == 0) | |
129 | return c; | |
130 | return NULL; | |
8ce64345 | 131 | } |
8efc0c15 | 132 | |
94ec8c6b | 133 | Cipher * |
134 | cipher_by_number(int id) | |
8efc0c15 | 135 | { |
94ec8c6b | 136 | Cipher *c; |
137 | for (c = ciphers; c->name != NULL; c++) | |
138 | if (c->number == id) | |
139 | return c; | |
140 | return NULL; | |
8efc0c15 | 141 | } |
142 | ||
a8be9f80 | 143 | #define CIPHER_SEP "," |
144 | int | |
145 | ciphers_valid(const char *names) | |
146 | { | |
94ec8c6b | 147 | Cipher *c; |
089fbbd2 | 148 | char *ciphers, *cp; |
a8be9f80 | 149 | char *p; |
a8be9f80 | 150 | |
71276795 | 151 | if (names == NULL || strcmp(names, "") == 0) |
a8be9f80 | 152 | return 0; |
089fbbd2 | 153 | ciphers = cp = xstrdup(names); |
94ec8c6b | 154 | for ((p = strsep(&cp, CIPHER_SEP)); p && *p != '\0'; |
184eed6a | 155 | (p = strsep(&cp, CIPHER_SEP))) { |
94ec8c6b | 156 | c = cipher_by_name(p); |
157 | if (c == NULL || c->number != SSH_CIPHER_SSH2) { | |
158 | debug("bad cipher %s [%s]", p, names); | |
a8be9f80 | 159 | xfree(ciphers); |
160 | return 0; | |
94ec8c6b | 161 | } else { |
33de75a3 | 162 | debug3("cipher ok: %s [%s]", p, names); |
a8be9f80 | 163 | } |
164 | } | |
33de75a3 | 165 | debug3("ciphers ok: [%s]", names); |
a8be9f80 | 166 | xfree(ciphers); |
167 | return 1; | |
168 | } | |
169 | ||
aa3378df | 170 | /* |
171 | * Parses the name of the cipher. Returns the number of the corresponding | |
172 | * cipher, or -1 on error. | |
173 | */ | |
8efc0c15 | 174 | |
175 | int | |
176 | cipher_number(const char *name) | |
177 | { | |
94ec8c6b | 178 | Cipher *c; |
71276795 | 179 | if (name == NULL) |
180 | return -1; | |
94ec8c6b | 181 | c = cipher_by_name(name); |
182 | return (c==NULL) ? -1 : c->number; | |
183 | } | |
184 | ||
185 | char * | |
186 | cipher_name(int id) | |
187 | { | |
188 | Cipher *c = cipher_by_number(id); | |
189 | return (c==NULL) ? "<unknown>" : c->name; | |
190 | } | |
191 | ||
192 | void | |
70fc1609 | 193 | cipher_init(CipherContext *cc, Cipher *cipher, |
194 | const u_char *key, u_int keylen, const u_char *iv, u_int ivlen, | |
195 | int encrypt) | |
94ec8c6b | 196 | { |
70fc1609 | 197 | static int dowarn = 1; |
a068d86f | 198 | #ifdef SSH_OLD_EVP |
199 | EVP_CIPHER *type; | |
200 | #else | |
70fc1609 | 201 | const EVP_CIPHER *type; |
a068d86f | 202 | #endif |
70fc1609 | 203 | int klen; |
204 | ||
205 | if (cipher->number == SSH_CIPHER_DES) { | |
206 | if (dowarn) { | |
207 | error("Warning: use of DES is strongly discouraged " | |
208 | "due to cryptographic weaknesses"); | |
209 | dowarn = 0; | |
210 | } | |
211 | if (keylen > 8) | |
212 | keylen = 8; | |
213 | } | |
214 | cc->plaintext = (cipher->number == SSH_CIPHER_NONE); | |
215 | ||
94ec8c6b | 216 | if (keylen < cipher->key_len) |
217 | fatal("cipher_init: key length %d is insufficient for %s.", | |
218 | keylen, cipher->name); | |
219 | if (iv != NULL && ivlen < cipher->block_size) | |
220 | fatal("cipher_init: iv length %d is insufficient for %s.", | |
221 | ivlen, cipher->name); | |
222 | cc->cipher = cipher; | |
70fc1609 | 223 | |
224 | type = (*cipher->evptype)(); | |
225 | ||
226 | EVP_CIPHER_CTX_init(&cc->evp); | |
a068d86f | 227 | #ifdef SSH_OLD_EVP |
228 | if (type->key_len > 0 && type->key_len != keylen) { | |
229 | debug("cipher_init: set keylen (%d -> %d)", | |
230 | type->key_len, keylen); | |
231 | type->key_len = keylen; | |
232 | } | |
233 | EVP_CipherInit(&cc->evp, type, (u_char *)key, (u_char *)iv, | |
234 | (encrypt == CIPHER_ENCRYPT)); | |
235 | #else | |
70fc1609 | 236 | if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv, |
237 | (encrypt == CIPHER_ENCRYPT)) == 0) | |
238 | fatal("cipher_init: EVP_CipherInit failed for %s", | |
239 | cipher->name); | |
240 | klen = EVP_CIPHER_CTX_key_length(&cc->evp); | |
241 | if (klen > 0 && keylen != klen) { | |
a77673cc | 242 | debug2("cipher_init: set keylen (%d -> %d)", klen, keylen); |
70fc1609 | 243 | if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0) |
244 | fatal("cipher_init: set keylen failed (%d -> %d)", | |
245 | klen, keylen); | |
246 | } | |
247 | if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0) | |
248 | fatal("cipher_init: EVP_CipherInit: set key failed for %s", | |
249 | cipher->name); | |
a068d86f | 250 | #endif |
94ec8c6b | 251 | } |
252 | ||
253 | void | |
3ee832e5 | 254 | cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len) |
94ec8c6b | 255 | { |
256 | if (len % cc->cipher->block_size) | |
257 | fatal("cipher_encrypt: bad plaintext length %d", len); | |
a068d86f | 258 | #ifdef SSH_OLD_EVP |
259 | EVP_Cipher(&cc->evp, dest, (u_char *)src, len); | |
260 | #else | |
70fc1609 | 261 | if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0) |
262 | fatal("evp_crypt: EVP_Cipher failed"); | |
a068d86f | 263 | #endif |
94ec8c6b | 264 | } |
265 | ||
266 | void | |
3ee832e5 | 267 | cipher_cleanup(CipherContext *cc) |
94ec8c6b | 268 | { |
a068d86f | 269 | #ifdef SSH_OLD_EVP |
270 | EVP_CIPHER_CTX_cleanup(&cc->evp); | |
271 | #else | |
70fc1609 | 272 | if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0) |
273 | error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed"); | |
a068d86f | 274 | #endif |
8efc0c15 | 275 | } |
276 | ||
aa3378df | 277 | /* |
278 | * Selects the cipher, and keys if by computing the MD5 checksum of the | |
279 | * passphrase and using the resulting 16 bytes as the key. | |
280 | */ | |
8efc0c15 | 281 | |
6ae2364d | 282 | void |
94ec8c6b | 283 | cipher_set_key_string(CipherContext *cc, Cipher *cipher, |
3ee832e5 | 284 | const char *passphrase, int encrypt) |
8efc0c15 | 285 | { |
5260325f | 286 | MD5_CTX md; |
1e3b8b07 | 287 | u_char digest[16]; |
5260325f | 288 | |
289 | MD5_Init(&md); | |
94ec8c6b | 290 | MD5_Update(&md, (const u_char *)passphrase, strlen(passphrase)); |
5260325f | 291 | MD5_Final(digest, &md); |
292 | ||
3ee832e5 | 293 | cipher_init(cc, cipher, digest, 16, NULL, 0, encrypt); |
5260325f | 294 | |
295 | memset(digest, 0, sizeof(digest)); | |
296 | memset(&md, 0, sizeof(md)); | |
8efc0c15 | 297 | } |
70fc1609 | 298 | |
299 | /* Implementations for other non-EVP ciphers */ | |
300 | ||
301 | /* | |
302 | * This is used by SSH1: | |
303 | * | |
304 | * What kind of triple DES are these 2 routines? | |
305 | * | |
306 | * Why is there a redundant initialization vector? | |
307 | * | |
308 | * If only iv3 was used, then, this would till effect have been | |
309 | * outer-cbc. However, there is also a private iv1 == iv2 which | |
310 | * perhaps makes differential analysis easier. On the other hand, the | |
311 | * private iv1 probably makes the CRC-32 attack ineffective. This is a | |
312 | * result of that there is no longer any known iv1 to use when | |
313 | * choosing the X block. | |
314 | */ | |
315 | struct ssh1_3des_ctx | |
316 | { | |
317 | EVP_CIPHER_CTX k1, k2, k3; | |
318 | }; | |
3ddc795d | 319 | |
70fc1609 | 320 | static int |
321 | ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, | |
322 | int enc) | |
323 | { | |
324 | struct ssh1_3des_ctx *c; | |
325 | u_char *k1, *k2, *k3; | |
326 | ||
327 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
328 | c = xmalloc(sizeof(*c)); | |
329 | EVP_CIPHER_CTX_set_app_data(ctx, c); | |
330 | } | |
331 | if (key == NULL) | |
332 | return (1); | |
333 | if (enc == -1) | |
334 | enc = ctx->encrypt; | |
335 | k1 = k2 = k3 = (u_char *) key; | |
336 | k2 += 8; | |
337 | if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) { | |
338 | if (enc) | |
339 | k3 += 16; | |
340 | else | |
341 | k1 += 16; | |
342 | } | |
343 | EVP_CIPHER_CTX_init(&c->k1); | |
344 | EVP_CIPHER_CTX_init(&c->k2); | |
345 | EVP_CIPHER_CTX_init(&c->k3); | |
a068d86f | 346 | #ifdef SSH_OLD_EVP |
347 | EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc); | |
348 | EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc); | |
349 | EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc); | |
350 | #else | |
70fc1609 | 351 | if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 || |
352 | EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 || | |
353 | EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) { | |
354 | memset(c, 0, sizeof(*c)); | |
355 | xfree(c); | |
356 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
357 | return (0); | |
358 | } | |
a068d86f | 359 | #endif |
70fc1609 | 360 | return (1); |
361 | } | |
3ddc795d | 362 | |
70fc1609 | 363 | static int |
364 | ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len) | |
365 | { | |
366 | struct ssh1_3des_ctx *c; | |
367 | ||
368 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
369 | error("ssh1_3des_cbc: no context"); | |
370 | return (0); | |
371 | } | |
a068d86f | 372 | #ifdef SSH_OLD_EVP |
373 | EVP_Cipher(&c->k1, dest, (u_char *)src, len); | |
374 | EVP_Cipher(&c->k2, dest, dest, len); | |
375 | EVP_Cipher(&c->k3, dest, dest, len); | |
376 | #else | |
70fc1609 | 377 | if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 || |
378 | EVP_Cipher(&c->k2, dest, dest, len) == 0 || | |
379 | EVP_Cipher(&c->k3, dest, dest, len) == 0) | |
380 | return (0); | |
a068d86f | 381 | #endif |
70fc1609 | 382 | return (1); |
383 | } | |
3ddc795d | 384 | |
70fc1609 | 385 | static int |
386 | ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx) | |
387 | { | |
388 | struct ssh1_3des_ctx *c; | |
389 | ||
390 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { | |
391 | memset(c, 0, sizeof(*c)); | |
392 | xfree(c); | |
393 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
394 | } | |
395 | return (1); | |
396 | } | |
3ddc795d | 397 | |
18ae3c67 | 398 | static void |
399 | ssh1_3des_iv(EVP_CIPHER_CTX *evp, int doset, u_char *iv, int len) | |
400 | { | |
401 | struct ssh1_3des_ctx *c; | |
402 | ||
403 | if (len != 24) | |
404 | fatal("%s: bad 3des iv length: %d", __func__, len); | |
405 | if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL) | |
406 | fatal("%s: no 3des context", __func__); | |
407 | if (doset) { | |
408 | debug3("%s: Installed 3DES IV", __func__); | |
409 | memcpy(c->k1.iv, iv, 8); | |
410 | memcpy(c->k2.iv, iv + 8, 8); | |
411 | memcpy(c->k3.iv, iv + 16, 8); | |
412 | } else { | |
413 | debug3("%s: Copying 3DES IV", __func__); | |
414 | memcpy(iv, c->k1.iv, 8); | |
415 | memcpy(iv + 8, c->k2.iv, 8); | |
416 | memcpy(iv + 16, c->k3.iv, 8); | |
417 | } | |
418 | } | |
419 | ||
7b5edc2b | 420 | static const EVP_CIPHER * |
70fc1609 | 421 | evp_ssh1_3des(void) |
422 | { | |
423 | static EVP_CIPHER ssh1_3des; | |
424 | ||
425 | memset(&ssh1_3des, 0, sizeof(EVP_CIPHER)); | |
426 | ssh1_3des.nid = NID_undef; | |
427 | ssh1_3des.block_size = 8; | |
428 | ssh1_3des.iv_len = 0; | |
429 | ssh1_3des.key_len = 16; | |
430 | ssh1_3des.init = ssh1_3des_init; | |
431 | ssh1_3des.cleanup = ssh1_3des_cleanup; | |
432 | ssh1_3des.do_cipher = ssh1_3des_cbc; | |
a068d86f | 433 | #ifndef SSH_OLD_EVP |
70fc1609 | 434 | ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH; |
a068d86f | 435 | #endif |
70fc1609 | 436 | return (&ssh1_3des); |
437 | } | |
438 | ||
439 | /* | |
440 | * SSH1 uses a variation on Blowfish, all bytes must be swapped before | |
441 | * and after encryption/decryption. Thus the swap_bytes stuff (yuk). | |
442 | */ | |
443 | static void | |
444 | swap_bytes(const u_char *src, u_char *dst, int n) | |
445 | { | |
446 | u_char c[4]; | |
447 | ||
448 | /* Process 4 bytes every lap. */ | |
449 | for (n = n / 4; n > 0; n--) { | |
450 | c[3] = *src++; | |
451 | c[2] = *src++; | |
452 | c[1] = *src++; | |
453 | c[0] = *src++; | |
454 | ||
455 | *dst++ = c[0]; | |
456 | *dst++ = c[1]; | |
457 | *dst++ = c[2]; | |
458 | *dst++ = c[3]; | |
459 | } | |
460 | } | |
3ddc795d | 461 | |
35c4faf5 | 462 | #ifdef SSH_OLD_EVP |
463 | static void bf_ssh1_init (EVP_CIPHER_CTX * ctx, const unsigned char *key, | |
464 | const unsigned char *iv, int enc) | |
465 | { | |
466 | if (iv != NULL) | |
467 | memcpy (&(ctx->oiv[0]), iv, 8); | |
468 | memcpy (&(ctx->iv[0]), &(ctx->oiv[0]), 8); | |
469 | if (key != NULL) | |
470 | BF_set_key (&(ctx->c.bf_ks), EVP_CIPHER_CTX_key_length (ctx), | |
471 | key); | |
472 | } | |
473 | #endif | |
70fc1609 | 474 | static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL; |
3ddc795d | 475 | |
70fc1609 | 476 | static int |
477 | bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) | |
478 | { | |
479 | int ret; | |
480 | ||
481 | swap_bytes(in, out, len); | |
482 | ret = (*orig_bf)(ctx, out, out, len); | |
483 | swap_bytes(out, out, len); | |
484 | return (ret); | |
485 | } | |
3ddc795d | 486 | |
7b5edc2b | 487 | static const EVP_CIPHER * |
70fc1609 | 488 | evp_ssh1_bf(void) |
489 | { | |
490 | static EVP_CIPHER ssh1_bf; | |
491 | ||
492 | memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); | |
493 | orig_bf = ssh1_bf.do_cipher; | |
494 | ssh1_bf.nid = NID_undef; | |
35c4faf5 | 495 | #ifdef SSH_OLD_EVP |
496 | ssh1_bf.init = bf_ssh1_init; | |
497 | #endif | |
70fc1609 | 498 | ssh1_bf.do_cipher = bf_ssh1_cipher; |
499 | ssh1_bf.key_len = 32; | |
500 | return (&ssh1_bf); | |
501 | } | |
502 | ||
135247df | 503 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
70fc1609 | 504 | /* RIJNDAEL */ |
505 | #define RIJNDAEL_BLOCKSIZE 16 | |
506 | struct ssh_rijndael_ctx | |
507 | { | |
508 | rijndael_ctx r_ctx; | |
509 | u_char r_iv[RIJNDAEL_BLOCKSIZE]; | |
510 | }; | |
511 | ||
512 | static int | |
513 | ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, | |
514 | int enc) | |
515 | { | |
516 | struct ssh_rijndael_ctx *c; | |
517 | ||
518 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
519 | c = xmalloc(sizeof(*c)); | |
520 | EVP_CIPHER_CTX_set_app_data(ctx, c); | |
521 | } | |
522 | if (key != NULL) { | |
523 | if (enc == -1) | |
524 | enc = ctx->encrypt; | |
525 | rijndael_set_key(&c->r_ctx, (u_char *)key, | |
526 | 8*EVP_CIPHER_CTX_key_length(ctx), enc); | |
527 | } | |
528 | if (iv != NULL) | |
529 | memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE); | |
530 | return (1); | |
531 | } | |
3ddc795d | 532 | |
70fc1609 | 533 | static int |
534 | ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, | |
535 | u_int len) | |
536 | { | |
537 | struct ssh_rijndael_ctx *c; | |
538 | u_char buf[RIJNDAEL_BLOCKSIZE]; | |
539 | u_char *cprev, *cnow, *plain, *ivp; | |
540 | int i, j, blocks = len / RIJNDAEL_BLOCKSIZE; | |
541 | ||
542 | if (len == 0) | |
543 | return (1); | |
544 | if (len % RIJNDAEL_BLOCKSIZE) | |
545 | fatal("ssh_rijndael_cbc: bad len %d", len); | |
546 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { | |
547 | error("ssh_rijndael_cbc: no context"); | |
548 | return (0); | |
549 | } | |
550 | if (ctx->encrypt) { | |
551 | cnow = dest; | |
552 | plain = (u_char *)src; | |
553 | cprev = c->r_iv; | |
554 | for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE, | |
555 | cnow+=RIJNDAEL_BLOCKSIZE) { | |
556 | for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) | |
557 | buf[j] = plain[j] ^ cprev[j]; | |
558 | rijndael_encrypt(&c->r_ctx, buf, cnow); | |
559 | cprev = cnow; | |
560 | } | |
561 | memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE); | |
562 | } else { | |
563 | cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE); | |
564 | plain = dest+len-RIJNDAEL_BLOCKSIZE; | |
565 | ||
566 | memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE); | |
567 | for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE, | |
568 | plain-=RIJNDAEL_BLOCKSIZE) { | |
569 | rijndael_decrypt(&c->r_ctx, cnow, plain); | |
05976246 | 570 | ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE; |
571 | for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) | |
572 | plain[j] ^= ivp[j]; | |
573 | } | |
574 | memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE); | |
575 | } | |
576 | return (1); | |
577 | } | |
3ddc795d | 578 | |
05976246 | 579 | static int |
580 | ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx) | |
581 | { | |
582 | struct ssh_rijndael_ctx *c; | |
583 | ||
584 | if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { | |
585 | memset(c, 0, sizeof(*c)); | |
586 | xfree(c); | |
587 | EVP_CIPHER_CTX_set_app_data(ctx, NULL); | |
588 | } | |
589 | return (1); | |
590 | } | |
3ddc795d | 591 | |
18ae3c67 | 592 | static void |
593 | ssh_rijndael_iv(EVP_CIPHER_CTX *evp, int doset, u_char * iv, u_int len) | |
594 | { | |
595 | struct ssh_rijndael_ctx *c; | |
596 | ||
597 | if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL) | |
598 | fatal("ssh_rijndael_iv: no context"); | |
599 | if (doset) | |
600 | memcpy(c->r_iv, iv, len); | |
601 | else | |
602 | memcpy(iv, c->r_iv, len); | |
603 | } | |
604 | ||
7b5edc2b | 605 | static const EVP_CIPHER * |
05976246 | 606 | evp_rijndael(void) |
607 | { | |
608 | static EVP_CIPHER rijndal_cbc; | |
609 | ||
610 | memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER)); | |
611 | rijndal_cbc.nid = NID_undef; | |
612 | rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE; | |
613 | rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE; | |
614 | rijndal_cbc.key_len = 16; | |
615 | rijndal_cbc.init = ssh_rijndael_init; | |
616 | rijndal_cbc.cleanup = ssh_rijndael_cleanup; | |
617 | rijndal_cbc.do_cipher = ssh_rijndael_cbc; | |
618 | #ifndef SSH_OLD_EVP | |
619 | rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | | |
a2f883ce | 620 | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV; |
05976246 | 621 | #endif |
622 | return (&rijndal_cbc); | |
bf8269a9 | 623 | } |
135247df | 624 | #endif |
bf8269a9 | 625 | |
762715ce | 626 | /* |
bf8269a9 | 627 | * Exports an IV from the CipherContext required to export the key |
628 | * state back from the unprivileged child to the privileged parent | |
629 | * process. | |
630 | */ | |
631 | ||
632 | int | |
633 | cipher_get_keyiv_len(CipherContext *cc) | |
634 | { | |
635 | Cipher *c = cc->cipher; | |
636 | int ivlen; | |
637 | ||
638 | if (c->number == SSH_CIPHER_3DES) | |
639 | ivlen = 24; | |
640 | else | |
641 | ivlen = EVP_CIPHER_CTX_iv_length(&cc->evp); | |
642 | return (ivlen); | |
643 | } | |
644 | ||
645 | void | |
646 | cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) | |
647 | { | |
648 | Cipher *c = cc->cipher; | |
bf8269a9 | 649 | int evplen; |
650 | ||
651 | switch (c->number) { | |
652 | case SSH_CIPHER_SSH2: | |
653 | case SSH_CIPHER_DES: | |
654 | case SSH_CIPHER_BLOWFISH: | |
655 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); | |
656 | if (evplen == 0) | |
657 | return; | |
658 | if (evplen != len) | |
1588c277 | 659 | fatal("%s: wrong iv length %d != %d", __func__, |
bf8269a9 | 660 | evplen, len); |
135247df | 661 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
18ae3c67 | 662 | if (c->evptype == evp_rijndael) |
663 | ssh_rijndael_iv(&cc->evp, 0, iv, len); | |
664 | else | |
135247df | 665 | #endif |
18ae3c67 | 666 | memcpy(iv, cc->evp.iv, len); |
667 | break; | |
668 | case SSH_CIPHER_3DES: | |
669 | ssh1_3des_iv(&cc->evp, 0, iv, 24); | |
bf8269a9 | 670 | break; |
bf8269a9 | 671 | default: |
1588c277 | 672 | fatal("%s: bad cipher %d", __func__, c->number); |
bf8269a9 | 673 | } |
bf8269a9 | 674 | } |
675 | ||
676 | void | |
677 | cipher_set_keyiv(CipherContext *cc, u_char *iv) | |
678 | { | |
679 | Cipher *c = cc->cipher; | |
bf8269a9 | 680 | int evplen = 0; |
681 | ||
682 | switch (c->number) { | |
683 | case SSH_CIPHER_SSH2: | |
684 | case SSH_CIPHER_DES: | |
685 | case SSH_CIPHER_BLOWFISH: | |
686 | evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); | |
687 | if (evplen == 0) | |
688 | return; | |
135247df | 689 | #if OPENSSL_VERSION_NUMBER < 0x00907000L |
18ae3c67 | 690 | if (c->evptype == evp_rijndael) |
691 | ssh_rijndael_iv(&cc->evp, 1, iv, evplen); | |
692 | else | |
135247df | 693 | #endif |
18ae3c67 | 694 | memcpy(cc->evp.iv, iv, evplen); |
695 | break; | |
696 | case SSH_CIPHER_3DES: | |
697 | ssh1_3des_iv(&cc->evp, 1, iv, 24); | |
bf8269a9 | 698 | break; |
bf8269a9 | 699 | default: |
1588c277 | 700 | fatal("%s: bad cipher %d", __func__, c->number); |
bf8269a9 | 701 | } |
bf8269a9 | 702 | } |
703 | ||
704 | #if OPENSSL_VERSION_NUMBER < 0x00907000L | |
705 | #define EVP_X_STATE(evp) &(evp).c | |
706 | #define EVP_X_STATE_LEN(evp) sizeof((evp).c) | |
707 | #else | |
708 | #define EVP_X_STATE(evp) (evp).cipher_data | |
709 | #define EVP_X_STATE_LEN(evp) (evp).cipher->ctx_size | |
710 | #endif | |
711 | ||
712 | int | |
713 | cipher_get_keycontext(CipherContext *cc, u_char *dat) | |
714 | { | |
715 | Cipher *c = cc->cipher; | |
9459414c | 716 | int plen = 0; |
bf8269a9 | 717 | |
9459414c | 718 | if (c->evptype == EVP_rc4) { |
719 | plen = EVP_X_STATE_LEN(cc->evp); | |
bf8269a9 | 720 | if (dat == NULL) |
9459414c | 721 | return (plen); |
722 | memcpy(dat, EVP_X_STATE(cc->evp), plen); | |
bf8269a9 | 723 | } |
bf8269a9 | 724 | return (plen); |
725 | } | |
726 | ||
727 | void | |
728 | cipher_set_keycontext(CipherContext *cc, u_char *dat) | |
729 | { | |
730 | Cipher *c = cc->cipher; | |
731 | int plen; | |
732 | ||
9459414c | 733 | if (c->evptype == EVP_rc4) { |
bf8269a9 | 734 | plen = EVP_X_STATE_LEN(cc->evp); |
735 | memcpy(EVP_X_STATE(cc->evp), dat, plen); | |
736 | } | |
70fc1609 | 737 | } |