2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
65 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
66 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
68 static void SSL_SESSION_list_remove();
69 static void SSL_SESSION_list_add();
72 static int ssl_session_num=0;
73 static STACK *ssl_session_meth=NULL;
75 SSL_SESSION *SSL_get_session(ssl)
81 int SSL_SESSION_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
89 return(CRYPTO_get_ex_new_index(ssl_session_num-1,
91 argl,argp,new_func,dup_func,free_func));
94 int SSL_SESSION_set_ex_data(s,idx,arg)
99 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
102 char *SSL_SESSION_get_ex_data(s,idx)
106 return(CRYPTO_get_ex_data(&s->ex_data,idx));
109 SSL_SESSION *SSL_SESSION_new()
113 ss=(SSL_SESSION *)Malloc(sizeof(SSL_SESSION));
116 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
119 memset(ss,0,sizeof(SSL_SESSION));
122 ss->timeout=60*5+4; /* 5 minute timeout by default */
126 CRYPTO_new_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
130 int ssl_get_new_session(s, session)
134 SSL_SESSION *ss=NULL;
136 if ((ss=SSL_SESSION_new()) == NULL) return(0);
138 /* If the context has a default timeout, use it */
139 if (s->ctx->session_timeout != 0)
140 ss->timeout=SSL_get_default_timeout(s);
142 if (s->session != NULL)
144 SSL_SESSION_free(s->session);
150 if (s->version == SSL2_CLIENT_VERSION)
152 ss->ssl_version=SSL2_VERSION;
153 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
155 else if (s->version == SSL3_VERSION)
157 ss->ssl_version=SSL3_VERSION;
158 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
160 else if (s->version == TLS1_VERSION)
162 ss->ssl_version=TLS1_VERSION;
163 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
167 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
168 SSL_SESSION_free(ss);
176 RAND_bytes(ss->session_id,ss->session_id_length);
177 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
178 r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,
180 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
181 if (r == NULL) break;
182 /* else - woops a session_id match */
187 ss->session_id_length=0;
191 ss->ssl_version=s->version;
196 int ssl_get_prev_session(s,session_id,len)
198 unsigned char *session_id;
201 SSL_SESSION *ret=NULL,data;
204 data.ssl_version=s->version;
205 data.session_id_length=len;
206 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
208 memcpy(data.session_id,session_id,len);;
210 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
212 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
213 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
214 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
223 if ((s->ctx->get_session_cb != NULL) &&
224 ((ret=s->ctx->get_session_cb(s,session_id,len,©))
227 s->ctx->sess_cb_hit++;
229 /* The following should not return 1, otherwise,
230 * things are very strange */
231 SSL_CTX_add_session(s->ctx,ret);
234 SSL_SESSION_free(ret);
236 if (ret == NULL) return(0);
239 if (ret->cipher == NULL)
247 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
248 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
250 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
251 if (ret->cipher == NULL)
255 /* If a thread got the session, then 'swaped', and another got
256 * it and then due to a time-out decided to 'Free' it we could
257 * be in trouble. So I'll increment it now, then double decrement
258 * later - am I speaking rubbish?. */
259 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
261 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
263 s->ctx->sess_timeout++;
264 /* remove it from the cache */
265 SSL_CTX_remove_session(s->ctx,ret);
266 SSL_SESSION_free(ret); /* again to actually Free it */
272 /* ret->time=time(NULL); */ /* rezero timeout? */
273 /* again, just leave the session
274 * if it is the same session, we have just incremented and
275 * then decremented the reference count :-) */
276 if (s->session != NULL)
277 SSL_SESSION_free(s->session);
282 int SSL_CTX_add_session(ctx,c)
290 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
292 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
293 s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
295 /* Put on the end of the queue unless it is already in the cache */
297 SSL_SESSION_list_add(ctx,c);
299 /* If the same session if is being 're-added', Free the old
300 * one when the last person stops using it.
301 * This will also work if it is alread in the cache.
302 * The references will go up and then down :-) */
312 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
314 while (SSL_CTX_sess_number(ctx) >
315 SSL_CTX_sess_get_cache_size(ctx))
317 if (!SSL_CTX_remove_session(ctx,
318 ctx->session_cache_tail))
321 ctx->sess_cache_full++;
325 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
329 int SSL_CTX_remove_session(ctx,c)
336 if ((c != NULL) && (c->session_id_length != 0))
338 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
339 r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
343 SSL_SESSION_list_remove(ctx,c);
346 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
351 if (ctx->remove_session_cb != NULL)
352 ctx->remove_session_cb(ctx,r);
361 void SSL_SESSION_free(ss)
366 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
368 REF_PRINT("SSL_SESSION",ss);
374 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
379 CRYPTO_free_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
381 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
382 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
383 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
384 if (ss->cert != NULL) ssl_cert_free(ss->cert);
385 if (ss->peer != NULL) X509_free(ss->peer);
386 if (ss->ciphers != NULL) sk_free(ss->ciphers);
387 memset(ss,0,sizeof(*ss));
391 int SSL_set_session(s, session)
393 SSL_SESSION *session;
400 meth=s->ctx->method->get_ssl_method(session->ssl_version);
402 meth=s->method->get_ssl_method(session->ssl_version);
405 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
409 if (meth != s->method)
411 if (!SSL_set_ssl_method(s,meth))
413 session->timeout=SSL_get_default_timeout(s);
416 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
417 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
418 if (s->session != NULL)
419 SSL_SESSION_free(s->session);
421 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
426 if (s->session != NULL)
428 SSL_SESSION_free(s->session);
435 long SSL_SESSION_set_timeout(s,t)
439 if (s == NULL) return(0);
444 long SSL_SESSION_get_timeout(s)
447 if (s == NULL) return(0);
451 long SSL_SESSION_get_time(s)
454 if (s == NULL) return(0);
458 long SSL_SESSION_set_time(s,t)
462 if (s == NULL) return(0);
467 typedef struct timeout_param_st
474 static void timeout(s,p)
478 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
480 /* The reason we don't call SSL_CTX_remove_session() is to
481 * save on locking overhead */
482 lh_delete(p->cache,(char *)s);
483 SSL_SESSION_list_remove(p->ctx,s);
485 if (p->ctx->remove_session_cb != NULL)
486 p->ctx->remove_session_cb(p->ctx,s);
491 void SSL_CTX_flush_sessions(s,t)
499 tp.cache=SSL_CTX_sessions(s);
500 if (tp.cache == NULL) return;
502 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
503 i=tp.cache->down_load;
504 tp.cache->down_load=0;
505 lh_doall_arg(tp.cache,(void (*)())timeout,(char *)&tp);
506 tp.cache->down_load=i;
507 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
510 int ssl_clear_bad_session(s)
513 if ( (s->session != NULL) &&
514 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
515 !(SSL_in_init(s) || SSL_in_before(s)))
517 SSL_CTX_remove_session(s->ctx,s->session);
524 /* locked by SSL_CTX in the calling function */
525 static void SSL_SESSION_list_remove(ctx,s)
529 if ((s->next == NULL) || (s->prev == NULL)) return;
531 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
532 { /* last element in list */
533 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
534 { /* only one element in list */
535 ctx->session_cache_head=NULL;
536 ctx->session_cache_tail=NULL;
540 ctx->session_cache_tail=s->prev;
541 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
546 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
547 { /* first element in list */
548 ctx->session_cache_head=s->next;
549 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
552 { /* middle of list */
553 s->next->prev=s->prev;
554 s->prev->next=s->next;
557 s->prev=s->next=NULL;
560 static void SSL_SESSION_list_add(ctx,s)
564 if ((s->next != NULL) && (s->prev != NULL))
565 SSL_SESSION_list_remove(ctx,s);
567 if (ctx->session_cache_head == NULL)
569 ctx->session_cache_head=s;
570 ctx->session_cache_tail=s;
571 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
572 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
576 s->next=ctx->session_cache_head;
578 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
579 ctx->session_cache_head=s;