1 /* ssl/s2_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include "ssl_locl.h"
60 #ifndef OPENSSL_NO_SSL2
61 # include <stdio.h>
62 # include <openssl/objects.h>
63 # include <openssl/evp.h>
64 # include <openssl/md5.h>
65
66 const char ssl2_version_str[] = "SSLv2" OPENSSL_VERSION_PTEXT;
67
68 # define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
69
70 /* list of available SSLv2 ciphers (sorted by id) */
71 OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[] = {
72 /* NULL_WITH_MD5 v3 */
73 # if 0
74 {
75 1,
76 SSL2_TXT_NULL_WITH_MD5,
77 SSL2_CK_NULL_WITH_MD5,
78 SSL_kRSA | SSL_aRSA | SSL_eNULL | SSL_MD5 | SSL_SSLV2,
79 SSL_EXPORT | SSL_EXP40 | SSL_STRONG_NONE,
80 0,
81 0,
82 0,
83 SSL_ALL_CIPHERS,
84 SSL_ALL_STRENGTHS,
85 },
86 # endif
87 /* RC4_128_WITH_MD5 */
88 {
89 1,
90 SSL2_TXT_RC4_128_WITH_MD5,
91 SSL2_CK_RC4_128_WITH_MD5,
92 SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
93 SSL_NOT_EXP | SSL_MEDIUM,
94 0,
95 128,
96 128,
97 SSL_ALL_CIPHERS,
98 SSL_ALL_STRENGTHS,
99 },
100
101 # if 0
102 /* RC4_128_EXPORT40_WITH_MD5 */
103 {
104 1,
105 SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
106 SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
107 SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
108 SSL_EXPORT | SSL_EXP40,
109 SSL2_CF_5_BYTE_ENC,
110 40,
111 128,
112 SSL_ALL_CIPHERS,
113 SSL_ALL_STRENGTHS,
114 },
115 # endif
116
117 /* RC2_128_CBC_WITH_MD5 */
118 {
119 1,
120 SSL2_TXT_RC2_128_CBC_WITH_MD5,
121 SSL2_CK_RC2_128_CBC_WITH_MD5,
122 SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
123 SSL_NOT_EXP | SSL_MEDIUM,
124 0,
125 128,
126 128,
127 SSL_ALL_CIPHERS,
128 SSL_ALL_STRENGTHS,
129 },
130
131 # if 0
132 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
133 {
134 1,
135 SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
136 SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
137 SSL_kRSA | SSL_aRSA | SSL_RC2 | SSL_MD5 | SSL_SSLV2,
138 SSL_EXPORT | SSL_EXP40,
139 SSL2_CF_5_BYTE_ENC,
140 40,
141 128,
142 SSL_ALL_CIPHERS,
143 SSL_ALL_STRENGTHS,
144 },
145 # endif
146
147 /* IDEA_128_CBC_WITH_MD5 */
148 # ifndef OPENSSL_NO_IDEA
149 {
150 1,
151 SSL2_TXT_IDEA_128_CBC_WITH_MD5,
152 SSL2_CK_IDEA_128_CBC_WITH_MD5,
153 SSL_kRSA | SSL_aRSA | SSL_IDEA | SSL_MD5 | SSL_SSLV2,
154 SSL_NOT_EXP | SSL_MEDIUM,
155 0,
156 128,
157 128,
158 SSL_ALL_CIPHERS,
159 SSL_ALL_STRENGTHS,
160 },
161 # endif
162
163 # if 0
164 /* DES_64_CBC_WITH_MD5 */
165 {
166 1,
167 SSL2_TXT_DES_64_CBC_WITH_MD5,
168 SSL2_CK_DES_64_CBC_WITH_MD5,
169 SSL_kRSA | SSL_aRSA | SSL_DES | SSL_MD5 | SSL_SSLV2,
170 SSL_NOT_EXP | SSL_LOW,
171 0,
172 56,
173 56,
174 SSL_ALL_CIPHERS,
175 SSL_ALL_STRENGTHS,
176 },
177 # endif
178
179 /* DES_192_EDE3_CBC_WITH_MD5 */
180 {
181 1,
182 SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
183 SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
184 SSL_kRSA | SSL_aRSA | SSL_3DES | SSL_MD5 | SSL_SSLV2,
185 SSL_NOT_EXP | SSL_HIGH,
186 0,
187 168,
188 168,
189 SSL_ALL_CIPHERS,
190 SSL_ALL_STRENGTHS,
191 },
192 /* RC4_64_WITH_MD5 */
193 # if 0
194 {
195 1,
196 SSL2_TXT_RC4_64_WITH_MD5,
197 SSL2_CK_RC4_64_WITH_MD5,
198 SSL_kRSA | SSL_aRSA | SSL_RC4 | SSL_MD5 | SSL_SSLV2,
199 SSL_NOT_EXP | SSL_LOW,
200 SSL2_CF_8_BYTE_ENC,
201 64,
202 64,
203 SSL_ALL_CIPHERS,
204 SSL_ALL_STRENGTHS,
205 },
206 # endif
207 /* NULL SSLeay (testing) */
208 # if 0
209 {
210 0,
211 SSL2_TXT_NULL,
212 SSL2_CK_NULL,
213 0,
214 SSL_STRONG_NONE,
215 0,
216 0,
217 0,
218 SSL_ALL_CIPHERS,
219 SSL_ALL_STRENGTHS,
220 },
221 # endif
222
223 /* end of list :-) */
224 };
225
ssl2_default_timeout(void)226 long ssl2_default_timeout(void)
227 {
228 return (300);
229 }
230
IMPLEMENT_ssl2_meth_func(sslv2_base_method,ssl_undefined_function,ssl_undefined_function,ssl_bad_method)231 IMPLEMENT_ssl2_meth_func(sslv2_base_method,
232 ssl_undefined_function,
233 ssl_undefined_function, ssl_bad_method)
234
235 int ssl2_num_ciphers(void)
236 {
237 return (SSL2_NUM_CIPHERS);
238 }
239
ssl2_get_cipher(unsigned int u)240 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
241 {
242 if (u < SSL2_NUM_CIPHERS)
243 return (&(ssl2_ciphers[SSL2_NUM_CIPHERS - 1 - u]));
244 else
245 return (NULL);
246 }
247
ssl2_pending(const SSL * s)248 int ssl2_pending(const SSL *s)
249 {
250 return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
251 }
252
ssl2_new(SSL * s)253 int ssl2_new(SSL *s)
254 {
255 SSL2_STATE *s2;
256
257 if ((s2 = OPENSSL_malloc(sizeof *s2)) == NULL)
258 goto err;
259 memset(s2, 0, sizeof *s2);
260
261 # if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
262 # error "assertion failed"
263 # endif
264
265 if ((s2->rbuf =
266 OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2)) == NULL)
267 goto err;
268 /*
269 * wbuf needs one byte more because when using two-byte headers, we leave
270 * the first byte unused in do_ssl_write (s2_pkt.c)
271 */
272 if ((s2->wbuf =
273 OPENSSL_malloc(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 3)) == NULL)
274 goto err;
275 s->s2 = s2;
276
277 ssl2_clear(s);
278 return (1);
279 err:
280 if (s2 != NULL) {
281 if (s2->wbuf != NULL)
282 OPENSSL_free(s2->wbuf);
283 if (s2->rbuf != NULL)
284 OPENSSL_free(s2->rbuf);
285 OPENSSL_free(s2);
286 }
287 return (0);
288 }
289
ssl2_free(SSL * s)290 void ssl2_free(SSL *s)
291 {
292 SSL2_STATE *s2;
293
294 if (s == NULL)
295 return;
296
297 s2 = s->s2;
298 if (s2->rbuf != NULL)
299 OPENSSL_free(s2->rbuf);
300 if (s2->wbuf != NULL)
301 OPENSSL_free(s2->wbuf);
302 OPENSSL_cleanse(s2, sizeof *s2);
303 OPENSSL_free(s2);
304 s->s2 = NULL;
305 }
306
ssl2_clear(SSL * s)307 void ssl2_clear(SSL *s)
308 {
309 SSL2_STATE *s2;
310 unsigned char *rbuf, *wbuf;
311
312 s2 = s->s2;
313
314 rbuf = s2->rbuf;
315 wbuf = s2->wbuf;
316
317 memset(s2, 0, sizeof *s2);
318
319 s2->rbuf = rbuf;
320 s2->wbuf = wbuf;
321 s2->clear_text = 1;
322 s->packet = s2->rbuf;
323 s->version = SSL2_VERSION;
324 s->packet_length = 0;
325 }
326
ssl2_ctrl(SSL * s,int cmd,long larg,void * parg)327 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
328 {
329 int ret = 0;
330
331 switch (cmd) {
332 case SSL_CTRL_GET_SESSION_REUSED:
333 ret = s->hit;
334 break;
335 case SSL_CTRL_CHECK_PROTO_VERSION:
336 return ssl3_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, larg, parg);
337 default:
338 break;
339 }
340 return (ret);
341 }
342
ssl2_callback_ctrl(SSL * s,int cmd,void (* fp)(void))343 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp) (void))
344 {
345 return (0);
346 }
347
ssl2_ctx_ctrl(SSL_CTX * ctx,int cmd,long larg,void * parg)348 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
349 {
350 return (0);
351 }
352
ssl2_ctx_callback_ctrl(SSL_CTX * ctx,int cmd,void (* fp)(void))353 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp) (void))
354 {
355 return (0);
356 }
357
358 /*
359 * This function needs to check if the ciphers required are actually
360 * available
361 */
ssl2_get_cipher_by_char(const unsigned char * p)362 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
363 {
364 SSL_CIPHER c, *cp;
365 unsigned long id;
366
367 id = 0x02000000L | ((unsigned long)p[0] << 16L) |
368 ((unsigned long)p[1] << 8L) | (unsigned long)p[2];
369 c.id = id;
370 cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
371 (char *)ssl2_ciphers,
372 SSL2_NUM_CIPHERS, sizeof(SSL_CIPHER),
373 FP_ICC ssl_cipher_id_cmp);
374 if ((cp == NULL) || (cp->valid == 0))
375 return NULL;
376 else
377 return cp;
378 }
379
ssl2_put_cipher_by_char(const SSL_CIPHER * c,unsigned char * p)380 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
381 {
382 long l;
383
384 if (p != NULL) {
385 l = c->id;
386 if ((l & 0xff000000) != 0x02000000 && l != SSL3_CK_FALLBACK_SCSV)
387 return (0);
388 p[0] = ((unsigned char)(l >> 16L)) & 0xFF;
389 p[1] = ((unsigned char)(l >> 8L)) & 0xFF;
390 p[2] = ((unsigned char)(l)) & 0xFF;
391 }
392 return (3);
393 }
394
ssl2_generate_key_material(SSL * s)395 int ssl2_generate_key_material(SSL *s)
396 {
397 unsigned int i;
398 EVP_MD_CTX ctx;
399 unsigned char *km;
400 unsigned char c = '0';
401 const EVP_MD *md5;
402
403 md5 = EVP_md5();
404
405 # ifdef CHARSET_EBCDIC
406 c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0', see
407 * SSLv2 docu */
408 # endif
409 EVP_MD_CTX_init(&ctx);
410 km = s->s2->key_material;
411
412 if (s->session->master_key_length < 0 ||
413 s->session->master_key_length > (int)sizeof(s->session->master_key)) {
414 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
415 return 0;
416 }
417
418 for (i = 0; i < s->s2->key_material_length; i += EVP_MD_size(md5)) {
419 if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
420 (int)sizeof(s->s2->key_material)) {
421 /*
422 * EVP_DigestFinal_ex() below would write beyond buffer
423 */
424 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
425 return 0;
426 }
427
428 EVP_DigestInit_ex(&ctx, md5, NULL);
429
430 OPENSSL_assert(s->session->master_key_length >= 0
431 && s->session->master_key_length
432 <= (int)sizeof(s->session->master_key));
433 EVP_DigestUpdate(&ctx, s->session->master_key,
434 s->session->master_key_length);
435 EVP_DigestUpdate(&ctx, &c, 1);
436 c++;
437 EVP_DigestUpdate(&ctx, s->s2->challenge, s->s2->challenge_length);
438 EVP_DigestUpdate(&ctx, s->s2->conn_id, s->s2->conn_id_length);
439 EVP_DigestFinal_ex(&ctx, km, NULL);
440 km += EVP_MD_size(md5);
441 }
442
443 EVP_MD_CTX_cleanup(&ctx);
444 return 1;
445 }
446
ssl2_return_error(SSL * s,int err)447 void ssl2_return_error(SSL *s, int err)
448 {
449 if (!s->error) {
450 s->error = 3;
451 s->error_code = err;
452
453 ssl2_write_error(s);
454 }
455 }
456
ssl2_write_error(SSL * s)457 void ssl2_write_error(SSL *s)
458 {
459 unsigned char buf[3];
460 int i, error;
461
462 buf[0] = SSL2_MT_ERROR;
463 buf[1] = (s->error_code >> 8) & 0xff;
464 buf[2] = (s->error_code) & 0xff;
465
466 /* state=s->rwstate;*/
467
468 error = s->error; /* number of bytes left to write */
469 s->error = 0;
470 OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
471 i = ssl2_write(s, &(buf[3 - error]), error);
472
473 /* if (i == error) s->rwstate=state; */
474
475 if (i < 0)
476 s->error = error;
477 else {
478 s->error = error - i;
479
480 if (s->error == 0)
481 if (s->msg_callback) {
482 /* ERROR */
483 s->msg_callback(1, s->version, 0, buf, 3, s,
484 s->msg_callback_arg);
485 }
486 }
487 }
488
ssl2_shutdown(SSL * s)489 int ssl2_shutdown(SSL *s)
490 {
491 s->shutdown = (SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
492 return (1);
493 }
494 #else /* !OPENSSL_NO_SSL2 */
495
496 # if PEDANTIC
497 static void *dummy = &dummy;
498 # endif
499
500 #endif
501