1/* ssl/s23_clnt.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 *

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75 if (ver == SSL3_VERSION)
76 return(SSLv3_client_method());
77 else if (ver == TLS1_VERSION)
78 return(TLSv1_client_method());
79 else
80 return(NULL);
81 }
82
83IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
84 ssl_undefined_function,
85 ssl23_connect,
86 ssl23_get_client_method)
87
88int ssl23_connect(SSL *s)
89 {
90 BUF_MEM *buf=NULL;
91 unsigned long Time=(unsigned long)time(NULL);
92 void (*cb)(const SSL *ssl,int type,int val)=NULL;
93 int ret= -1;
94 int new_state,state;
95
96 RAND_add(&Time,sizeof(Time),0);
97 ERR_clear_error();
98 clear_sys_error();
99

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197 return(ret);
198 }
199
200
201static int ssl23_client_hello(SSL *s)
202 {
203 unsigned char *buf;
204 unsigned char *p,*d;
205 int i,j,ch_len;
206 unsigned long Time,l;
207 int ssl2_compat;
208 int version = 0, version_major, version_minor;
209 SSL_COMP *comp;
210 int ret;
211
212 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
213
214 if (!(s->options & SSL_OP_NO_TLSv1))
215 {
216 version = TLS1_VERSION;
217 }
218 else if (!(s->options & SSL_OP_NO_SSLv3))
219 {
220 version = SSL3_VERSION;
221 }
222 else if (!(s->options & SSL_OP_NO_SSLv2))
223 {
224 version = SSL2_VERSION;
225 }
226
227 buf=(unsigned char *)s->init_buf->data;
228 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
229 {
230#if 0
231 /* don't reuse session-id's */
232 if (!ssl_get_new_session(s,0))
233 {
234 return(-1);
235 }
236#endif
237
238 p=s->s3->client_random;
239 Time=(unsigned long)time(NULL); /* Time */
240 l2n(Time,p);
241 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
242 return -1;
243
244 if (version == TLS1_VERSION)
245 {
246 version_major = TLS1_VERSION_MAJOR;
247 version_minor = TLS1_VERSION_MINOR;
248 }
249 else if (version == SSL3_VERSION)
250 {
251 version_major = SSL3_VERSION_MAJOR;
252 version_minor = SSL3_VERSION_MINOR;
253 }
254 else if (version == SSL2_VERSION)
255 {
256 version_major = SSL2_VERSION_MAJOR;
257 version_minor = SSL2_VERSION_MINOR;
258 }
259 else
260 {
261 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
262 return(-1);
263 }
264
265 s->client_version = version;
266
267 if (ssl2_compat)
268 {
269 /* create SSL 2.0 compatible Client Hello */
270
271 /* two byte record header will be written last */
272 d = &(buf[2]);
273 p = d + 9; /* leave space for message type, version, individual length fields */
274
275 *(d++) = SSL2_MT_CLIENT_HELLO;
276 *(d++) = version_major;
277 *(d++) = version_minor;
278
279 /* Ciphers supported */
280 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
281 if (i == 0)
282 {
283 /* no ciphers */
284 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
285 return -1;
286 }
287 s2n(i,d);
288 p+=i;
289
290 /* put in the session-id length (zero since there is no reuse) */
291#if 0
292 s->session->session_id_length=0;
293#endif
294 s2n(0,d);
295
296 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
297 ch_len=SSL2_CHALLENGE_LENGTH;
298 else
299 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
300
301 /* write out sslv2 challenge */
302 if (SSL3_RANDOM_SIZE < ch_len)
303 i=SSL3_RANDOM_SIZE;
304 else
305 i=ch_len;
306 s2n(i,d);
307 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
308 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
309 return -1;
310
311 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
312 p+=i;
313
314 i= p- &(buf[2]);
315 buf[0]=((i>>8)&0xff)|0x80;
316 buf[1]=(i&0xff);
317
318 /* number of bytes to write */
319 s->init_num=i+2;
320 s->init_off=0;
321
322 ssl3_finish_mac(s,&(buf[2]),i);
323 }
324 else
325 {
326 /* create Client Hello in SSL 3.0/TLS 1.0 format */
327
328 /* do the record header (5 bytes) and handshake message header (4 bytes) last */
329 d = p = &(buf[9]);
330
331 *(p++) = version_major;
332 *(p++) = version_minor;
333
334 /* Random stuff */
335 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
336 p += SSL3_RANDOM_SIZE;
337
338 /* Session ID (zero since there is no reuse) */
339 *(p++) = 0;
340
341 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
342 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
343 if (i == 0)
344 {
345 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
346 return -1;
347 }
348 s2n(i,p);
349 p+=i;
350
351 /* COMPRESSION */
352 if (s->ctx->comp_methods == NULL)
353 j=0;
354 else
355 j=sk_SSL_COMP_num(s->ctx->comp_methods);
356 *(p++)=1+j;
357 for (i=0; i<j; i++)
358 {
359 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
360 *(p++)=comp->id;
361 }
362 *(p++)=0; /* Add the NULL method */
363
364 l = p-d;
365 *p = 42;
366
367 /* fill in 4-byte handshake header */
368 d=&(buf[5]);
369 *(d++)=SSL3_MT_CLIENT_HELLO;
370 l2n3(l,d);
371
372 l += 4;
373
374 if (l > SSL3_RT_MAX_PLAIN_LENGTH)
375 {
376 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
377 return -1;
378 }
379
380 /* fill in 5-byte record header */
381 d=buf;
382 *(d++) = SSL3_RT_HANDSHAKE;
383 *(d++) = version_major;
384 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
385 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
386 s2n((int)l,d);
387
388 /* number of bytes to write */
389 s->init_num=p-buf;
390 s->init_off=0;
391
392 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
393 }
394
395 s->state=SSL23_ST_CW_CLNT_HELLO_B;
396 s->init_off=0;
397 }
398
399 /* SSL3_ST_CW_CLNT_HELLO_B */
400 ret = ssl23_write_bytes(s);
401
402 if ((ret >= 2) && s->msg_callback)
403 {
404 /* Client Hello has been sent; tell msg_callback */
405
406 if (ssl2_compat)
407 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
408 else
409 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
410 }
411
412 return ret;
413 }
414
415static int ssl23_get_server_hello(SSL *s)
416 {
417 char buf[8];
418 unsigned char *p;
419 int i;

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