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 */
127 CRYPTO_new_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
131 int ssl_get_new_session(s, session)
135 SSL_SESSION *ss=NULL;
137 if ((ss=SSL_SESSION_new()) == NULL) return(0);
139 /* If the context has a default timeout, use it */
140 if (s->ctx->session_timeout == 0)
141 ss->timeout=SSL_get_default_timeout(s);
143 ss->timeout=s->ctx->session_timeout;
145 if (s->session != NULL)
147 SSL_SESSION_free(s->session);
153 if (s->version == SSL2_CLIENT_VERSION)
155 ss->ssl_version=SSL2_VERSION;
156 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
158 else if (s->version == SSL3_VERSION)
160 ss->ssl_version=SSL3_VERSION;
161 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
163 else if (s->version == TLS1_VERSION)
165 ss->ssl_version=TLS1_VERSION;
166 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
170 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
171 SSL_SESSION_free(ss);
179 RAND_bytes(ss->session_id,ss->session_id_length);
180 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
181 r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,
183 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
184 if (r == NULL) break;
185 /* else - woops a session_id match */
190 ss->session_id_length=0;
194 ss->ssl_version=s->version;
199 int ssl_get_prev_session(s,session_id,len)
201 unsigned char *session_id;
204 SSL_SESSION *ret=NULL,data;
207 data.ssl_version=s->version;
208 data.session_id_length=len;
209 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
211 memcpy(data.session_id,session_id,len);;
213 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
215 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
216 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
217 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
224 s->ctx->stats.sess_miss++;
226 if ((s->ctx->get_session_cb != NULL) &&
227 ((ret=s->ctx->get_session_cb(s,session_id,len,©))
230 s->ctx->stats.sess_cb_hit++;
232 /* The following should not return 1, otherwise,
233 * things are very strange */
234 SSL_CTX_add_session(s->ctx,ret);
237 SSL_SESSION_free(ret);
239 if (ret == NULL) return(0);
242 if (ret->cipher == NULL)
250 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
251 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
253 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
254 if (ret->cipher == NULL)
258 /* If a thread got the session, then 'swaped', and another got
259 * it and then due to a time-out decided to 'Free' it we could
260 * be in trouble. So I'll increment it now, then double decrement
261 * later - am I speaking rubbish?. */
262 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
264 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
266 s->ctx->stats.sess_timeout++;
267 /* remove it from the cache */
268 SSL_CTX_remove_session(s->ctx,ret);
269 SSL_SESSION_free(ret); /* again to actually Free it */
273 s->ctx->stats.sess_hit++;
275 /* ret->time=time(NULL); */ /* rezero timeout? */
276 /* again, just leave the session
277 * if it is the same session, we have just incremented and
278 * then decremented the reference count :-) */
279 if (s->session != NULL)
280 SSL_SESSION_free(s->session);
285 int SSL_CTX_add_session(ctx,c)
293 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
295 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
296 s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
298 /* Put on the end of the queue unless it is already in the cache */
300 SSL_SESSION_list_add(ctx,c);
302 /* If the same session if is being 're-added', Free the old
303 * one when the last person stops using it.
304 * This will also work if it is alread in the cache.
305 * The references will go up and then down :-) */
315 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
317 while (SSL_CTX_sess_number(ctx) >
318 SSL_CTX_sess_get_cache_size(ctx))
320 if (!SSL_CTX_remove_session(ctx,
321 ctx->session_cache_tail))
324 ctx->stats.sess_cache_full++;
328 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
332 int SSL_CTX_remove_session(ctx,c)
339 if ((c != NULL) && (c->session_id_length != 0))
341 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
342 r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
346 SSL_SESSION_list_remove(ctx,c);
349 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
354 if (ctx->remove_session_cb != NULL)
355 ctx->remove_session_cb(ctx,r);
364 void SSL_SESSION_free(ss)
372 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
374 REF_PRINT("SSL_SESSION",ss);
380 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
385 CRYPTO_free_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
387 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
388 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
389 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
390 if (ss->cert != NULL) ssl_cert_free(ss->cert);
391 if (ss->peer != NULL) X509_free(ss->peer);
392 if (ss->ciphers != NULL) sk_free(ss->ciphers);
393 memset(ss,0,sizeof(*ss));
397 int SSL_set_session(s, session)
399 SSL_SESSION *session;
406 meth=s->ctx->method->get_ssl_method(session->ssl_version);
408 meth=s->method->get_ssl_method(session->ssl_version);
411 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
415 if (meth != s->method)
417 if (!SSL_set_ssl_method(s,meth))
419 if (s->ctx->session_timeout == 0)
420 session->timeout=SSL_get_default_timeout(s);
422 session->timeout=s->ctx->session_timeout;
425 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
426 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
427 if (s->session != NULL)
428 SSL_SESSION_free(s->session);
430 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
435 if (s->session != NULL)
437 SSL_SESSION_free(s->session);
442 if (meth != s->method)
444 if (!SSL_set_ssl_method(s,meth))
452 long SSL_SESSION_set_timeout(s,t)
456 if (s == NULL) return(0);
461 long SSL_SESSION_get_timeout(s)
464 if (s == NULL) return(0);
468 long SSL_SESSION_get_time(s)
471 if (s == NULL) return(0);
475 long SSL_SESSION_set_time(s,t)
479 if (s == NULL) return(0);
484 long SSL_CTX_set_timeout(s,t)
489 if (s == NULL) return(0);
490 l=s->session_timeout;
491 s->session_timeout=t;
495 long SSL_CTX_get_timeout(s)
498 if (s == NULL) return(0);
499 return(s->session_timeout);
502 typedef struct timeout_param_st
509 static void timeout(s,p)
513 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
515 /* The reason we don't call SSL_CTX_remove_session() is to
516 * save on locking overhead */
517 lh_delete(p->cache,(char *)s);
518 SSL_SESSION_list_remove(p->ctx,s);
520 if (p->ctx->remove_session_cb != NULL)
521 p->ctx->remove_session_cb(p->ctx,s);
526 void SSL_CTX_flush_sessions(s,t)
534 tp.cache=s->sessions;
535 if (tp.cache == NULL) return;
537 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
538 i=tp.cache->down_load;
539 tp.cache->down_load=0;
540 lh_doall_arg(tp.cache,(void (*)())timeout,(char *)&tp);
541 tp.cache->down_load=i;
542 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
545 int ssl_clear_bad_session(s)
548 if ( (s->session != NULL) &&
549 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
550 !(SSL_in_init(s) || SSL_in_before(s)))
552 SSL_CTX_remove_session(s->ctx,s->session);
559 /* locked by SSL_CTX in the calling function */
560 static void SSL_SESSION_list_remove(ctx,s)
564 if ((s->next == NULL) || (s->prev == NULL)) return;
566 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
567 { /* last element in list */
568 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
569 { /* only one element in list */
570 ctx->session_cache_head=NULL;
571 ctx->session_cache_tail=NULL;
575 ctx->session_cache_tail=s->prev;
576 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
581 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
582 { /* first element in list */
583 ctx->session_cache_head=s->next;
584 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
587 { /* middle of list */
588 s->next->prev=s->prev;
589 s->prev->next=s->next;
592 s->prev=s->next=NULL;
595 static void SSL_SESSION_list_add(ctx,s)
599 if ((s->next != NULL) && (s->prev != NULL))
600 SSL_SESSION_list_remove(ctx,s);
602 if (ctx->session_cache_head == NULL)
604 ctx->session_cache_head=s;
605 ctx->session_cache_tail=s;
606 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
607 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
611 s->next=ctx->session_cache_head;
613 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
614 ctx->session_cache_head=s;