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 void *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_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;
193 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
194 ss->sid_ctx_length=s->sid_ctx_length;
196 ss->ssl_version=s->version;
201 int ssl_get_prev_session(s,session_id,len)
203 unsigned char *session_id;
206 SSL_SESSION *ret=NULL,data;
210 data.ssl_version=s->version;
211 data.session_id_length=len;
212 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
214 memcpy(data.session_id,session_id,len);
216 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
218 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
219 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
220 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
225 s->ctx->stats.sess_miss++;
227 if (s->ctx->get_session_cb != NULL
228 && (ret=s->ctx->get_session_cb(s,session_id,len,©))
231 s->ctx->stats.sess_cb_hit++;
233 /* The following should not return 1, otherwise,
234 * things are very strange */
235 SSL_CTX_add_session(s->ctx,ret);
237 if (ret == NULL) return(0);
240 if((s->verify_mode&SSL_VERIFY_PEER)
241 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length
242 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)))
244 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
250 SSL_SESSION_free(ret);
252 if (ret->cipher == NULL)
254 unsigned char buf[5],*p;
260 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
261 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
263 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
264 if (ret->cipher == NULL)
268 /* If a thread got the session, then 'swaped', and another got
269 * it and then due to a time-out decided to 'Free' it we could
270 * be in trouble. So I'll increment it now, then double decrement
271 * later - am I speaking rubbish?. */
272 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
274 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
276 s->ctx->stats.sess_timeout++;
277 /* remove it from the cache */
278 SSL_CTX_remove_session(s->ctx,ret);
279 SSL_SESSION_free(ret); /* again to actually Free it */
283 s->ctx->stats.sess_hit++;
285 /* ret->time=time(NULL); */ /* rezero timeout? */
286 /* again, just leave the session
287 * if it is the same session, we have just incremented and
288 * then decremented the reference count :-) */
289 if (s->session != NULL)
290 SSL_SESSION_free(s->session);
295 int SSL_CTX_add_session(ctx,c)
303 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
305 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
306 s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
308 /* Put on the end of the queue unless it is already in the cache */
310 SSL_SESSION_list_add(ctx,c);
312 /* If the same session if is being 're-added', Free the old
313 * one when the last person stops using it.
314 * This will also work if it is alread in the cache.
315 * The references will go up and then down :-) */
325 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
327 while (SSL_CTX_sess_number(ctx) >
328 SSL_CTX_sess_get_cache_size(ctx))
330 if (!SSL_CTX_remove_session(ctx,
331 ctx->session_cache_tail))
334 ctx->stats.sess_cache_full++;
338 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
342 int SSL_CTX_remove_session(ctx,c)
349 if ((c != NULL) && (c->session_id_length != 0))
351 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
352 r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
356 SSL_SESSION_list_remove(ctx,c);
359 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
364 if (ctx->remove_session_cb != NULL)
365 ctx->remove_session_cb(ctx,r);
374 void SSL_SESSION_free(ss)
382 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
384 REF_PRINT("SSL_SESSION",ss);
390 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
395 CRYPTO_free_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
397 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
398 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
399 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
400 if (ss->cert != NULL) ssl_cert_free(ss->cert);
401 if (ss->peer != NULL) X509_free(ss->peer);
402 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
403 memset(ss,0,sizeof(*ss));
407 int SSL_set_session(s, session)
409 SSL_SESSION *session;
416 meth=s->ctx->method->get_ssl_method(session->ssl_version);
418 meth=s->method->get_ssl_method(session->ssl_version);
421 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
425 if (meth != s->method)
427 if (!SSL_set_ssl_method(s,meth))
429 if (s->ctx->session_timeout == 0)
430 session->timeout=SSL_get_default_timeout(s);
432 session->timeout=s->ctx->session_timeout;
435 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
436 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
437 if (s->session != NULL)
438 SSL_SESSION_free(s->session);
440 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
445 if (s->session != NULL)
447 SSL_SESSION_free(s->session);
452 if (meth != s->method)
454 if (!SSL_set_ssl_method(s,meth))
462 long SSL_SESSION_set_timeout(s,t)
466 if (s == NULL) return(0);
471 long SSL_SESSION_get_timeout(s)
474 if (s == NULL) return(0);
478 long SSL_SESSION_get_time(s)
481 if (s == NULL) return(0);
485 long SSL_SESSION_set_time(s,t)
489 if (s == NULL) return(0);
494 long SSL_CTX_set_timeout(s,t)
499 if (s == NULL) return(0);
500 l=s->session_timeout;
501 s->session_timeout=t;
505 long SSL_CTX_get_timeout(s)
508 if (s == NULL) return(0);
509 return(s->session_timeout);
512 typedef struct timeout_param_st
519 static void timeout(s,p)
523 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
525 /* The reason we don't call SSL_CTX_remove_session() is to
526 * save on locking overhead */
527 lh_delete(p->cache,(char *)s);
528 SSL_SESSION_list_remove(p->ctx,s);
530 if (p->ctx->remove_session_cb != NULL)
531 p->ctx->remove_session_cb(p->ctx,s);
536 void SSL_CTX_flush_sessions(s,t)
544 tp.cache=s->sessions;
545 if (tp.cache == NULL) return;
547 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
548 i=tp.cache->down_load;
549 tp.cache->down_load=0;
550 lh_doall_arg(tp.cache,(void (*)())timeout,(char *)&tp);
551 tp.cache->down_load=i;
552 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
555 int ssl_clear_bad_session(s)
558 if ( (s->session != NULL) &&
559 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
560 !(SSL_in_init(s) || SSL_in_before(s)))
562 SSL_CTX_remove_session(s->ctx,s->session);
569 /* locked by SSL_CTX in the calling function */
570 static void SSL_SESSION_list_remove(ctx,s)
574 if ((s->next == NULL) || (s->prev == NULL)) return;
576 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
577 { /* last element in list */
578 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
579 { /* only one element in list */
580 ctx->session_cache_head=NULL;
581 ctx->session_cache_tail=NULL;
585 ctx->session_cache_tail=s->prev;
586 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
591 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
592 { /* first element in list */
593 ctx->session_cache_head=s->next;
594 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
597 { /* middle of list */
598 s->next->prev=s->prev;
599 s->prev->next=s->next;
602 s->prev=s->next=NULL;
605 static void SSL_SESSION_list_add(ctx,s)
609 if ((s->next != NULL) && (s->prev != NULL))
610 SSL_SESSION_list_remove(ctx,s);
612 if (ctx->session_cache_head == NULL)
614 ctx->session_cache_head=s;
615 ctx->session_cache_tail=s;
616 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
617 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
621 s->next=ctx->session_cache_head;
623 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
624 ctx->session_cache_head=s;