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/rsa.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65 #include <openssl/md5.h>
66
67 static long ssl2_default_timeout(void );
68 const char ssl2_version_str[]="SSLv2" OPENSSL_VERSION_PTEXT;
69
70 #define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
71
72 OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
73 /* NULL_WITH_MD5 v3 */
74 #if 0
75 {
76 1,
77 SSL2_TXT_NULL_WITH_MD5,
78 SSL2_CK_NULL_WITH_MD5,
79 SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2,
80 SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE,
81 0,
82 0,
83 0,
84 SSL_ALL_CIPHERS,
85 SSL_ALL_STRENGTHS,
86 },
87 #endif
88 /* RC4_128_EXPORT40_WITH_MD5 */
89 {
90 1,
91 SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
92 SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
93 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
94 SSL_EXPORT|SSL_EXP40,
95 SSL2_CF_5_BYTE_ENC,
96 40,
97 128,
98 SSL_ALL_CIPHERS,
99 SSL_ALL_STRENGTHS,
100 },
101 /* RC4_128_WITH_MD5 */
102 {
103 1,
104 SSL2_TXT_RC4_128_WITH_MD5,
105 SSL2_CK_RC4_128_WITH_MD5,
106 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
107 SSL_NOT_EXP|SSL_MEDIUM,
108 0,
109 128,
110 128,
111 SSL_ALL_CIPHERS,
112 SSL_ALL_STRENGTHS,
113 },
114 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
115 {
116 1,
117 SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
118 SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
119 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
120 SSL_EXPORT|SSL_EXP40,
121 SSL2_CF_5_BYTE_ENC,
122 40,
123 128,
124 SSL_ALL_CIPHERS,
125 SSL_ALL_STRENGTHS,
126 },
127 /* RC2_128_CBC_WITH_MD5 */
128 {
129 1,
130 SSL2_TXT_RC2_128_CBC_WITH_MD5,
131 SSL2_CK_RC2_128_CBC_WITH_MD5,
132 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
133 SSL_NOT_EXP|SSL_MEDIUM,
134 0,
135 128,
136 128,
137 SSL_ALL_CIPHERS,
138 SSL_ALL_STRENGTHS,
139 },
140 /* IDEA_128_CBC_WITH_MD5 */
141 #ifndef OPENSSL_NO_IDEA
142 {
143 1,
144 SSL2_TXT_IDEA_128_CBC_WITH_MD5,
145 SSL2_CK_IDEA_128_CBC_WITH_MD5,
146 SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
147 SSL_NOT_EXP|SSL_MEDIUM,
148 0,
149 128,
150 128,
151 SSL_ALL_CIPHERS,
152 SSL_ALL_STRENGTHS,
153 },
154 #endif
155 /* DES_64_CBC_WITH_MD5 */
156 {
157 1,
158 SSL2_TXT_DES_64_CBC_WITH_MD5,
159 SSL2_CK_DES_64_CBC_WITH_MD5,
160 SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2,
161 SSL_NOT_EXP|SSL_LOW,
162 0,
163 56,
164 56,
165 SSL_ALL_CIPHERS,
166 SSL_ALL_STRENGTHS,
167 },
168 /* DES_192_EDE3_CBC_WITH_MD5 */
169 {
170 1,
171 SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
172 SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
173 SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2,
174 SSL_NOT_EXP|SSL_HIGH,
175 0,
176 168,
177 168,
178 SSL_ALL_CIPHERS,
179 SSL_ALL_STRENGTHS,
180 },
181 /* RC4_64_WITH_MD5 */
182 #if 0
183 {
184 1,
185 SSL2_TXT_RC4_64_WITH_MD5,
186 SSL2_CK_RC4_64_WITH_MD5,
187 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
188 SSL_NOT_EXP|SSL_LOW,
189 SSL2_CF_8_BYTE_ENC,
190 64,
191 64,
192 SSL_ALL_CIPHERS,
193 SSL_ALL_STRENGTHS,
194 },
195 #endif
196 /* NULL SSLeay (testing) */
197 #if 0
198 {
199 0,
200 SSL2_TXT_NULL,
201 SSL2_CK_NULL,
202 0,
203 SSL_STRONG_NONE,
204 0,
205 0,
206 0,
207 SSL_ALL_CIPHERS,
208 SSL_ALL_STRENGTHS,
209 },
210 #endif
211
212 /* end of list :-) */
213 };
214
215 static SSL_METHOD SSLv2_data= {
216 SSL2_VERSION,
217 ssl2_new, /* local */
218 ssl2_clear, /* local */
219 ssl2_free, /* local */
220 ssl_undefined_function,
221 ssl_undefined_function,
222 ssl2_read,
223 ssl2_peek,
224 ssl2_write,
225 ssl2_shutdown,
226 ssl_ok, /* NULL - renegotiate */
227 ssl_ok, /* NULL - check renegotiate */
228 ssl2_ctrl, /* local */
229 ssl2_ctx_ctrl, /* local */
230 ssl2_get_cipher_by_char,
231 ssl2_put_cipher_by_char,
232 ssl2_pending,
233 ssl2_num_ciphers,
234 ssl2_get_cipher,
235 ssl_bad_method,
236 ssl2_default_timeout,
237 &ssl3_undef_enc_method,
238 ssl_undefined_function,
239 ssl2_callback_ctrl, /* local */
240 ssl2_ctx_callback_ctrl, /* local */
241 };
242
ssl2_default_timeout(void)243 static long ssl2_default_timeout(void)
244 {
245 return(300);
246 }
247
sslv2_base_method(void)248 SSL_METHOD *sslv2_base_method(void)
249 {
250 return(&SSLv2_data);
251 }
252
ssl2_num_ciphers(void)253 int ssl2_num_ciphers(void)
254 {
255 return(SSL2_NUM_CIPHERS);
256 }
257
ssl2_get_cipher(unsigned int u)258 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
259 {
260 if (u < SSL2_NUM_CIPHERS)
261 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
262 else
263 return(NULL);
264 }
265
ssl2_pending(const SSL * s)266 int ssl2_pending(const SSL *s)
267 {
268 return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
269 }
270
ssl2_new(SSL * s)271 int ssl2_new(SSL *s)
272 {
273 SSL2_STATE *s2;
274
275 if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
276 memset(s2,0,sizeof *s2);
277
278 #if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
279 # error "assertion failed"
280 #endif
281
282 if ((s2->rbuf=OPENSSL_malloc(
283 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
284 /* wbuf needs one byte more because when using two-byte headers,
285 * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
286 if ((s2->wbuf=OPENSSL_malloc(
287 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
288 s->s2=s2;
289
290 ssl2_clear(s);
291 return(1);
292 err:
293 if (s2 != NULL)
294 {
295 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
296 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
297 OPENSSL_free(s2);
298 }
299 return(0);
300 }
301
ssl2_free(SSL * s)302 void ssl2_free(SSL *s)
303 {
304 SSL2_STATE *s2;
305
306 if(s == NULL)
307 return;
308
309 s2=s->s2;
310 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
311 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
312 OPENSSL_cleanse(s2,sizeof *s2);
313 OPENSSL_free(s2);
314 s->s2=NULL;
315 }
316
ssl2_clear(SSL * s)317 void ssl2_clear(SSL *s)
318 {
319 SSL2_STATE *s2;
320 unsigned char *rbuf,*wbuf;
321
322 s2=s->s2;
323
324 rbuf=s2->rbuf;
325 wbuf=s2->wbuf;
326
327 memset(s2,0,sizeof *s2);
328
329 s2->rbuf=rbuf;
330 s2->wbuf=wbuf;
331 s2->clear_text=1;
332 s->packet=s2->rbuf;
333 s->version=SSL2_VERSION;
334 s->packet_length=0;
335 }
336
ssl2_ctrl(SSL * s,int cmd,long larg,void * parg)337 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
338 {
339 int ret=0;
340
341 switch(cmd)
342 {
343 case SSL_CTRL_GET_SESSION_REUSED:
344 ret=s->hit;
345 break;
346 default:
347 break;
348 }
349 return(ret);
350 }
351
ssl2_callback_ctrl(SSL * s,int cmd,void (* fp)())352 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)())
353 {
354 return(0);
355 }
356
ssl2_ctx_ctrl(SSL_CTX * ctx,int cmd,long larg,void * parg)357 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
358 {
359 return(0);
360 }
361
ssl2_ctx_callback_ctrl(SSL_CTX * ctx,int cmd,void (* fp)())362 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
363 {
364 return(0);
365 }
366
367 /* This function needs to check if the ciphers required are actually
368 * available */
ssl2_get_cipher_by_char(const unsigned char * p)369 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
370 {
371 static int init=1;
372 static SSL_CIPHER *sorted[SSL2_NUM_CIPHERS];
373 SSL_CIPHER c,*cp= &c,**cpp;
374 unsigned long id;
375 int i;
376
377 if (init)
378 {
379 CRYPTO_w_lock(CRYPTO_LOCK_SSL);
380
381 if (init)
382 {
383 for (i=0; i<SSL2_NUM_CIPHERS; i++)
384 sorted[i]= &(ssl2_ciphers[i]);
385
386 qsort((char *)sorted,
387 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
388 FP_ICC ssl_cipher_ptr_id_cmp);
389
390 init=0;
391 }
392
393 CRYPTO_w_unlock(CRYPTO_LOCK_SSL);
394 }
395
396 id=0x02000000L|((unsigned long)p[0]<<16L)|
397 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
398 c.id=id;
399 cpp=(SSL_CIPHER **)OBJ_bsearch((char *)&cp,
400 (char *)sorted,
401 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER *),
402 FP_ICC ssl_cipher_ptr_id_cmp);
403 if ((cpp == NULL) || !(*cpp)->valid)
404 return(NULL);
405 else
406 return(*cpp);
407 }
408
ssl2_put_cipher_by_char(const SSL_CIPHER * c,unsigned char * p)409 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
410 {
411 long l;
412
413 if (p != NULL)
414 {
415 l=c->id;
416 if ((l & 0xff000000) != 0x02000000) return(0);
417 p[0]=((unsigned char)(l>>16L))&0xFF;
418 p[1]=((unsigned char)(l>> 8L))&0xFF;
419 p[2]=((unsigned char)(l ))&0xFF;
420 }
421 return(3);
422 }
423
ssl2_generate_key_material(SSL * s)424 int ssl2_generate_key_material(SSL *s)
425 {
426 unsigned int i;
427 EVP_MD_CTX ctx;
428 unsigned char *km;
429 unsigned char c='0';
430 const EVP_MD *md5;
431
432 md5 = EVP_md5();
433
434 #ifdef CHARSET_EBCDIC
435 c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
436 see SSLv2 docu */
437 #endif
438 EVP_MD_CTX_init(&ctx);
439 km=s->s2->key_material;
440
441 if (s->session->master_key_length < 0 || s->session->master_key_length > sizeof s->session->master_key)
442 {
443 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
444 return 0;
445 }
446
447 for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
448 {
449 if (((km - s->s2->key_material) + EVP_MD_size(md5)) > sizeof s->s2->key_material)
450 {
451 /* EVP_DigestFinal_ex() below would write beyond buffer */
452 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
453 return 0;
454 }
455
456 EVP_DigestInit_ex(&ctx, md5, NULL);
457
458 OPENSSL_assert(s->session->master_key_length >= 0
459 && s->session->master_key_length
460 < sizeof s->session->master_key);
461 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
462 EVP_DigestUpdate(&ctx,&c,1);
463 c++;
464 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
465 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
466 EVP_DigestFinal_ex(&ctx,km,NULL);
467 km += EVP_MD_size(md5);
468 }
469
470 EVP_MD_CTX_cleanup(&ctx);
471 return 1;
472 }
473
ssl2_return_error(SSL * s,int err)474 void ssl2_return_error(SSL *s, int err)
475 {
476 if (!s->error)
477 {
478 s->error=3;
479 s->error_code=err;
480
481 ssl2_write_error(s);
482 }
483 }
484
485
ssl2_write_error(SSL * s)486 void ssl2_write_error(SSL *s)
487 {
488 unsigned char buf[3];
489 int i,error;
490
491 buf[0]=SSL2_MT_ERROR;
492 buf[1]=(s->error_code>>8)&0xff;
493 buf[2]=(s->error_code)&0xff;
494
495 /* state=s->rwstate;*/
496
497 error=s->error; /* number of bytes left to write */
498 s->error=0;
499 OPENSSL_assert(error >= 0 && error <= sizeof buf);
500 i=ssl2_write(s,&(buf[3-error]),error);
501
502 /* if (i == error) s->rwstate=state; */
503
504 if (i < 0)
505 s->error=error;
506 else
507 {
508 s->error=error-i;
509
510 if (s->error == 0)
511 if (s->msg_callback)
512 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
513 }
514 }
515
ssl2_shutdown(SSL * s)516 int ssl2_shutdown(SSL *s)
517 {
518 s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
519 return(1);
520 }
521 #else /* !OPENSSL_NO_SSL2 */
522
523 # if PEDANTIC
524 static void *dummy=&dummy;
525 # endif
526
527 #endif
528