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 /* RC4_128_EXPORT40_WITH_MD5 */
101 {
102 1,
103 SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
104 SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
105 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
106 SSL_EXPORT|SSL_EXP40,
107 SSL2_CF_5_BYTE_ENC,
108 40,
109 128,
110 SSL_ALL_CIPHERS,
111 SSL_ALL_STRENGTHS,
112 },
113 /* RC2_128_CBC_WITH_MD5 */
114 {
115 1,
116 SSL2_TXT_RC2_128_CBC_WITH_MD5,
117 SSL2_CK_RC2_128_CBC_WITH_MD5,
118 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
119 SSL_NOT_EXP|SSL_MEDIUM,
120 0,
121 128,
122 128,
123 SSL_ALL_CIPHERS,
124 SSL_ALL_STRENGTHS,
125 },
126 /* RC2_128_CBC_EXPORT40_WITH_MD5 */
127 {
128 1,
129 SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
130 SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
131 SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
132 SSL_EXPORT|SSL_EXP40,
133 SSL2_CF_5_BYTE_ENC,
134 40,
135 128,
136 SSL_ALL_CIPHERS,
137 SSL_ALL_STRENGTHS,
138 },
139 /* IDEA_128_CBC_WITH_MD5 */
140 #ifndef OPENSSL_NO_IDEA
141 {
142 1,
143 SSL2_TXT_IDEA_128_CBC_WITH_MD5,
144 SSL2_CK_IDEA_128_CBC_WITH_MD5,
145 SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
146 SSL_NOT_EXP|SSL_MEDIUM,
147 0,
148 128,
149 128,
150 SSL_ALL_CIPHERS,
151 SSL_ALL_STRENGTHS,
152 },
153 #endif
154 /* DES_64_CBC_WITH_MD5 */
155 {
156 1,
157 SSL2_TXT_DES_64_CBC_WITH_MD5,
158 SSL2_CK_DES_64_CBC_WITH_MD5,
159 SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2,
160 SSL_NOT_EXP|SSL_LOW,
161 0,
162 56,
163 56,
164 SSL_ALL_CIPHERS,
165 SSL_ALL_STRENGTHS,
166 },
167 /* DES_192_EDE3_CBC_WITH_MD5 */
168 {
169 1,
170 SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
171 SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
172 SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2,
173 SSL_NOT_EXP|SSL_HIGH,
174 0,
175 168,
176 168,
177 SSL_ALL_CIPHERS,
178 SSL_ALL_STRENGTHS,
179 },
180 /* RC4_64_WITH_MD5 */
181 #if 0
182 {
183 1,
184 SSL2_TXT_RC4_64_WITH_MD5,
185 SSL2_CK_RC4_64_WITH_MD5,
186 SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
187 SSL_NOT_EXP|SSL_LOW,
188 SSL2_CF_8_BYTE_ENC,
189 64,
190 64,
191 SSL_ALL_CIPHERS,
192 SSL_ALL_STRENGTHS,
193 },
194 #endif
195 /* NULL SSLeay (testing) */
196 #if 0
197 {
198 0,
199 SSL2_TXT_NULL,
200 SSL2_CK_NULL,
201 0,
202 SSL_STRONG_NONE,
203 0,
204 0,
205 0,
206 SSL_ALL_CIPHERS,
207 SSL_ALL_STRENGTHS,
208 },
209 #endif
210
211 /* end of list :-) */
212 };
213
ssl2_default_timeout(void)214 long ssl2_default_timeout(void)
215 {
216 return(300);
217 }
218
IMPLEMENT_ssl2_meth_func(sslv2_base_method,ssl_undefined_function,ssl_undefined_function,ssl_bad_method)219 IMPLEMENT_ssl2_meth_func(sslv2_base_method,
220 ssl_undefined_function,
221 ssl_undefined_function,
222 ssl_bad_method)
223
224 int ssl2_num_ciphers(void)
225 {
226 return(SSL2_NUM_CIPHERS);
227 }
228
ssl2_get_cipher(unsigned int u)229 SSL_CIPHER *ssl2_get_cipher(unsigned int u)
230 {
231 if (u < SSL2_NUM_CIPHERS)
232 return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
233 else
234 return(NULL);
235 }
236
ssl2_pending(const SSL * s)237 int ssl2_pending(const SSL *s)
238 {
239 return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
240 }
241
ssl2_new(SSL * s)242 int ssl2_new(SSL *s)
243 {
244 SSL2_STATE *s2;
245
246 if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
247 memset(s2,0,sizeof *s2);
248
249 #if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
250 # error "assertion failed"
251 #endif
252
253 if ((s2->rbuf=OPENSSL_malloc(
254 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
255 /* wbuf needs one byte more because when using two-byte headers,
256 * we leave the first byte unused in do_ssl_write (s2_pkt.c) */
257 if ((s2->wbuf=OPENSSL_malloc(
258 SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
259 s->s2=s2;
260
261 ssl2_clear(s);
262 return(1);
263 err:
264 if (s2 != NULL)
265 {
266 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
267 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
268 OPENSSL_free(s2);
269 }
270 return(0);
271 }
272
ssl2_free(SSL * s)273 void ssl2_free(SSL *s)
274 {
275 SSL2_STATE *s2;
276
277 if(s == NULL)
278 return;
279
280 s2=s->s2;
281 if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
282 if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
283 OPENSSL_cleanse(s2,sizeof *s2);
284 OPENSSL_free(s2);
285 s->s2=NULL;
286 }
287
ssl2_clear(SSL * s)288 void ssl2_clear(SSL *s)
289 {
290 SSL2_STATE *s2;
291 unsigned char *rbuf,*wbuf;
292
293 s2=s->s2;
294
295 rbuf=s2->rbuf;
296 wbuf=s2->wbuf;
297
298 memset(s2,0,sizeof *s2);
299
300 s2->rbuf=rbuf;
301 s2->wbuf=wbuf;
302 s2->clear_text=1;
303 s->packet=s2->rbuf;
304 s->version=SSL2_VERSION;
305 s->packet_length=0;
306 }
307
ssl2_ctrl(SSL * s,int cmd,long larg,void * parg)308 long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
309 {
310 int ret=0;
311
312 switch(cmd)
313 {
314 case SSL_CTRL_GET_SESSION_REUSED:
315 ret=s->hit;
316 break;
317 default:
318 break;
319 }
320 return(ret);
321 }
322
ssl2_callback_ctrl(SSL * s,int cmd,void (* fp)(void))323 long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
324 {
325 return(0);
326 }
327
ssl2_ctx_ctrl(SSL_CTX * ctx,int cmd,long larg,void * parg)328 long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
329 {
330 return(0);
331 }
332
ssl2_ctx_callback_ctrl(SSL_CTX * ctx,int cmd,void (* fp)(void))333 long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
334 {
335 return(0);
336 }
337
338 /* This function needs to check if the ciphers required are actually
339 * available */
ssl2_get_cipher_by_char(const unsigned char * p)340 SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
341 {
342 SSL_CIPHER c,*cp;
343 unsigned long id;
344
345 id=0x02000000L|((unsigned long)p[0]<<16L)|
346 ((unsigned long)p[1]<<8L)|(unsigned long)p[2];
347 c.id=id;
348 cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
349 (char *)ssl2_ciphers,
350 SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER),
351 FP_ICC ssl_cipher_id_cmp);
352 if ((cp == NULL) || (cp->valid == 0))
353 return NULL;
354 else
355 return cp;
356 }
357
ssl2_put_cipher_by_char(const SSL_CIPHER * c,unsigned char * p)358 int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
359 {
360 long l;
361
362 if (p != NULL)
363 {
364 l=c->id;
365 if ((l & 0xff000000) != 0x02000000) return(0);
366 p[0]=((unsigned char)(l>>16L))&0xFF;
367 p[1]=((unsigned char)(l>> 8L))&0xFF;
368 p[2]=((unsigned char)(l ))&0xFF;
369 }
370 return(3);
371 }
372
ssl2_generate_key_material(SSL * s)373 int ssl2_generate_key_material(SSL *s)
374 {
375 unsigned int i;
376 EVP_MD_CTX ctx;
377 unsigned char *km;
378 unsigned char c='0';
379 const EVP_MD *md5;
380
381 md5 = EVP_md5();
382
383 #ifdef CHARSET_EBCDIC
384 c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
385 see SSLv2 docu */
386 #endif
387 EVP_MD_CTX_init(&ctx);
388 km=s->s2->key_material;
389
390 if (s->session->master_key_length < 0 ||
391 s->session->master_key_length > (int)sizeof(s->session->master_key))
392 {
393 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
394 return 0;
395 }
396
397 for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
398 {
399 if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
400 (int)sizeof(s->s2->key_material))
401 {
402 /* EVP_DigestFinal_ex() below would write beyond buffer */
403 SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
404 return 0;
405 }
406
407 EVP_DigestInit_ex(&ctx, md5, NULL);
408
409 OPENSSL_assert(s->session->master_key_length >= 0
410 && s->session->master_key_length
411 < (int)sizeof(s->session->master_key));
412 EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
413 EVP_DigestUpdate(&ctx,&c,1);
414 c++;
415 EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
416 EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
417 EVP_DigestFinal_ex(&ctx,km,NULL);
418 km += EVP_MD_size(md5);
419 }
420
421 EVP_MD_CTX_cleanup(&ctx);
422 return 1;
423 }
424
ssl2_return_error(SSL * s,int err)425 void ssl2_return_error(SSL *s, int err)
426 {
427 if (!s->error)
428 {
429 s->error=3;
430 s->error_code=err;
431
432 ssl2_write_error(s);
433 }
434 }
435
436
ssl2_write_error(SSL * s)437 void ssl2_write_error(SSL *s)
438 {
439 unsigned char buf[3];
440 int i,error;
441
442 buf[0]=SSL2_MT_ERROR;
443 buf[1]=(s->error_code>>8)&0xff;
444 buf[2]=(s->error_code)&0xff;
445
446 /* state=s->rwstate;*/
447
448 error=s->error; /* number of bytes left to write */
449 s->error=0;
450 OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
451 i=ssl2_write(s,&(buf[3-error]),error);
452
453 /* if (i == error) s->rwstate=state; */
454
455 if (i < 0)
456 s->error=error;
457 else
458 {
459 s->error=error-i;
460
461 if (s->error == 0)
462 if (s->msg_callback)
463 s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
464 }
465 }
466
ssl2_shutdown(SSL * s)467 int ssl2_shutdown(SSL *s)
468 {
469 s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
470 return(1);
471 }
472 #else /* !OPENSSL_NO_SSL2 */
473
474 # if PEDANTIC
475 static void *dummy=&dummy;
476 # endif
477
478 #endif
479