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.]
63 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
64 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
66 static void SSL_SESSION_list_remove();
67 static void SSL_SESSION_list_add();
70 static int ssl_session_num=0;
71 static STACK *ssl_session_meth=NULL;
73 SSL_SESSION *SSL_get_session(ssl)
79 int SSL_SESSION_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
87 return(CRYPTO_get_ex_new_index(ssl_session_num-1,
89 argl,argp,new_func,dup_func,free_func));
92 int SSL_SESSION_set_ex_data(s,idx,arg)
97 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
100 char *SSL_SESSION_get_ex_data(s,idx)
104 return(CRYPTO_get_ex_data(&s->ex_data,idx));
107 SSL_SESSION *SSL_SESSION_new()
111 ss=(SSL_SESSION *)Malloc(sizeof(SSL_SESSION));
114 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
117 memset(ss,0,sizeof(SSL_SESSION));
120 ss->timeout=60*5+4; /* 5 minute timeout by default */
124 CRYPTO_new_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
128 int ssl_get_new_session(s, session)
132 SSL_SESSION *ss=NULL;
134 if ((ss=SSL_SESSION_new()) == NULL) return(0);
136 /* If the context has a default timeout, use it */
137 if (s->ctx->session_timeout != 0)
138 ss->timeout=SSL_get_default_timeout(s);
140 if (s->session != NULL)
142 SSL_SESSION_free(s->session);
148 if (s->version == SSL2_CLIENT_VERSION)
150 ss->ssl_version=SSL2_VERSION;
151 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
153 else if (s->version == SSL3_VERSION)
155 ss->ssl_version=SSL3_VERSION;
156 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
158 else if (s->version == TLS1_VERSION)
160 ss->ssl_version=TLS1_VERSION;
161 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
165 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
166 SSL_SESSION_free(ss);
174 RAND_bytes(ss->session_id,ss->session_id_length);
175 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
176 r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,
178 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
179 if (r == NULL) break;
180 /* else - woops a session_id match */
185 ss->session_id_length=0;
189 ss->ssl_version=s->version;
194 int ssl_get_prev_session(s,session_id,len)
196 unsigned char *session_id;
199 SSL_SESSION *ret=NULL,data;
202 data.ssl_version=s->version;
203 data.session_id_length=len;
204 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
206 memcpy(data.session_id,session_id,len);;
208 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
210 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
211 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
212 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
221 if ((s->ctx->get_session_cb != NULL) &&
222 ((ret=s->ctx->get_session_cb(s,session_id,len,©))
225 s->ctx->sess_cb_hit++;
227 /* The following should not return 1, otherwise,
228 * things are very strange */
229 SSL_CTX_add_session(s->ctx,ret);
232 SSL_SESSION_free(ret);
234 if (ret == NULL) return(0);
237 if (ret->cipher == NULL)
245 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
246 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
248 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
249 if (ret->cipher == NULL)
253 /* If a thread got the session, then 'swaped', and another got
254 * it and then due to a time-out decided to 'Free' it we could
255 * be in trouble. So I'll increment it now, then double decrement
256 * later - am I speaking rubbish?. */
257 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
259 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
261 s->ctx->sess_timeout++;
262 /* remove it from the cache */
263 SSL_CTX_remove_session(s->ctx,ret);
264 SSL_SESSION_free(ret); /* again to actually Free it */
270 /* ret->time=time(NULL); */ /* rezero timeout? */
271 /* again, just leave the session
272 * if it is the same session, we have just incremented and
273 * then decremented the reference count :-) */
274 if (s->session != NULL)
275 SSL_SESSION_free(s->session);
280 int SSL_CTX_add_session(ctx,c)
288 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
290 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
291 s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
293 /* Put on the end of the queue unless it is already in the cache */
295 SSL_SESSION_list_add(ctx,c);
297 /* If the same session if is being 're-added', Free the old
298 * one when the last person stops using it.
299 * This will also work if it is alread in the cache.
300 * The references will go up and then down :-) */
310 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
312 while (SSL_CTX_sess_number(ctx) >
313 SSL_CTX_sess_get_cache_size(ctx))
315 if (!SSL_CTX_remove_session(ctx,
316 ctx->session_cache_tail))
319 ctx->sess_cache_full++;
323 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
327 int SSL_CTX_remove_session(ctx,c)
334 if ((c != NULL) && (c->session_id_length != 0))
336 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
337 r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
341 SSL_SESSION_list_remove(ctx,c);
344 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
349 if (ctx->remove_session_cb != NULL)
350 ctx->remove_session_cb(ctx,r);
359 void SSL_SESSION_free(ss)
367 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
369 REF_PRINT("SSL_SESSION",ss);
375 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
380 CRYPTO_free_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
382 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
383 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
384 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
385 if (ss->cert != NULL) ssl_cert_free(ss->cert);
386 if (ss->peer != NULL) X509_free(ss->peer);
387 if (ss->ciphers != NULL) sk_free(ss->ciphers);
388 memset(ss,0,sizeof(*ss));
392 int SSL_set_session(s, session)
394 SSL_SESSION *session;
401 meth=s->ctx->method->get_ssl_method(session->ssl_version);
403 meth=s->method->get_ssl_method(session->ssl_version);
406 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
410 if (meth != s->method)
412 if (!SSL_set_ssl_method(s,meth))
414 session->timeout=SSL_get_default_timeout(s);
417 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
418 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
419 if (s->session != NULL)
420 SSL_SESSION_free(s->session);
422 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
427 if (s->session != NULL)
429 SSL_SESSION_free(s->session);
436 long SSL_SESSION_set_timeout(s,t)
440 if (s == NULL) return(0);
445 long SSL_SESSION_get_timeout(s)
448 if (s == NULL) return(0);
452 long SSL_SESSION_get_time(s)
455 if (s == NULL) return(0);
459 long SSL_SESSION_set_time(s,t)
463 if (s == NULL) return(0);
468 typedef struct timeout_param_st
475 static void timeout(s,p)
479 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
481 /* The reason we don't call SSL_CTX_remove_session() is to
482 * save on locking overhead */
483 lh_delete(p->cache,(char *)s);
484 SSL_SESSION_list_remove(p->ctx,s);
486 if (p->ctx->remove_session_cb != NULL)
487 p->ctx->remove_session_cb(p->ctx,s);
492 void SSL_CTX_flush_sessions(s,t)
500 tp.cache=SSL_CTX_sessions(s);
501 if (tp.cache == NULL) return;
503 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
504 i=tp.cache->down_load;
505 tp.cache->down_load=0;
506 lh_doall_arg(tp.cache,(void (*)())timeout,(char *)&tp);
507 tp.cache->down_load=i;
508 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
511 int ssl_clear_bad_session(s)
514 if ( (s->session != NULL) &&
515 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
516 !(SSL_in_init(s) || SSL_in_before(s)))
518 SSL_CTX_remove_session(s->ctx,s->session);
525 /* locked by SSL_CTX in the calling function */
526 static void SSL_SESSION_list_remove(ctx,s)
530 if ((s->next == NULL) || (s->prev == NULL)) return;
532 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
533 { /* last element in list */
534 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
535 { /* only one element in list */
536 ctx->session_cache_head=NULL;
537 ctx->session_cache_tail=NULL;
541 ctx->session_cache_tail=s->prev;
542 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
547 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
548 { /* first element in list */
549 ctx->session_cache_head=s->next;
550 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
553 { /* middle of list */
554 s->next->prev=s->prev;
555 s->prev->next=s->next;
558 s->prev=s->next=NULL;
561 static void SSL_SESSION_list_add(ctx,s)
565 if ((s->next != NULL) && (s->prev != NULL))
566 SSL_SESSION_list_remove(ctx,s);
568 if (ctx->session_cache_head == NULL)
570 ctx->session_cache_head=s;
571 ctx->session_cache_tail=s;
572 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
573 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
577 s->next=ctx->session_cache_head;
579 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
580 ctx->session_cache_head=s;