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-rw-r--r--src/lib/libssl/ssl_sess.c637
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diff --git a/src/lib/libssl/ssl_sess.c b/src/lib/libssl/ssl_sess.c
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index 681499f08a..0000000000
--- a/src/lib/libssl/ssl_sess.c
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1/* ssl/ssl_sess.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 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include <openssl/lhash.h>
61#include <openssl/rand.h>
62#include "ssl_locl.h"
63
64static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
65static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
66static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
67static int ssl_session_num=0;
68static STACK *ssl_session_meth=NULL;
69
70SSL_SESSION *SSL_get_session(SSL *ssl)
71 {
72 return(ssl->session);
73 }
74
75int SSL_SESSION_get_ex_new_index(long argl, char *argp, int (*new_func)(),
76 int (*dup_func)(), void (*free_func)())
77 {
78 ssl_session_num++;
79 return(CRYPTO_get_ex_new_index(ssl_session_num-1,
80 &ssl_session_meth,
81 argl,argp,new_func,dup_func,free_func));
82 }
83
84int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
85 {
86 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
87 }
88
89void *SSL_SESSION_get_ex_data(SSL_SESSION *s, int idx)
90 {
91 return(CRYPTO_get_ex_data(&s->ex_data,idx));
92 }
93
94SSL_SESSION *SSL_SESSION_new(void)
95 {
96 SSL_SESSION *ss;
97
98 ss=(SSL_SESSION *)Malloc(sizeof(SSL_SESSION));
99 if (ss == NULL)
100 {
101 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
102 return(0);
103 }
104 memset(ss,0,sizeof(SSL_SESSION));
105
106 ss->references=1;
107 ss->timeout=60*5+4; /* 5 minute timeout by default */
108 ss->time=time(NULL);
109 ss->prev=NULL;
110 ss->next=NULL;
111 ss->compress_meth=0;
112 CRYPTO_new_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
113 return(ss);
114 }
115
116int ssl_get_new_session(SSL *s, int session)
117 {
118 /* This gets used by clients and servers. */
119
120 SSL_SESSION *ss=NULL;
121
122 if ((ss=SSL_SESSION_new()) == NULL) return(0);
123
124 /* If the context has a default timeout, use it */
125 if (s->ctx->session_timeout == 0)
126 ss->timeout=SSL_get_default_timeout(s);
127 else
128 ss->timeout=s->ctx->session_timeout;
129
130 if (s->session != NULL)
131 {
132 SSL_SESSION_free(s->session);
133 s->session=NULL;
134 }
135
136 if (session)
137 {
138 if (s->version == SSL2_VERSION)
139 {
140 ss->ssl_version=SSL2_VERSION;
141 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
142 }
143 else if (s->version == SSL3_VERSION)
144 {
145 ss->ssl_version=SSL3_VERSION;
146 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
147 }
148 else if (s->version == TLS1_VERSION)
149 {
150 ss->ssl_version=TLS1_VERSION;
151 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
152 }
153 else
154 {
155 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
156 SSL_SESSION_free(ss);
157 return(0);
158 }
159
160 for (;;)
161 {
162 SSL_SESSION *r;
163
164 RAND_bytes(ss->session_id,ss->session_id_length);
165 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
166 r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,
167 (char *)ss);
168 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
169 if (r == NULL) break;
170 /* else - woops a session_id match */
171 /* XXX should also check external cache!
172 * (But the probability of a collision is negligible, anyway...) */
173 }
174 }
175 else
176 {
177 ss->session_id_length=0;
178 }
179
180 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
181 ss->sid_ctx_length=s->sid_ctx_length;
182 s->session=ss;
183 ss->ssl_version=s->version;
184
185 return(1);
186 }
187
188int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len)
189 {
190 /* This is used only by servers. */
191
192 SSL_SESSION *ret=NULL,data;
193 int fatal = 0;
194
195 /* conn_init();*/
196 data.ssl_version=s->version;
197 data.session_id_length=len;
198 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
199 goto err;
200 memcpy(data.session_id,session_id,len);
201
202 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
203 {
204 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
205 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
206 if (ret != NULL)
207 /* don't allow other threads to steal it: */
208 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
209 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
210 }
211
212 if (ret == NULL)
213 {
214 int copy=1;
215
216 s->ctx->stats.sess_miss++;
217 ret=NULL;
218 if (s->ctx->get_session_cb != NULL
219 && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))
220 != NULL)
221 {
222 s->ctx->stats.sess_cb_hit++;
223
224 /* Increment reference count now if the session callback
225 * asks us to do so (note that if the session structures
226 * returned by the callback are shared between threads,
227 * it must handle the reference count itself [i.e. copy == 0],
228 * or things won't be thread-safe). */
229 if (copy)
230 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
231
232 /* The following should not return 1, otherwise,
233 * things are very strange */
234 SSL_CTX_add_session(s->ctx,ret);
235 }
236 if (ret == NULL)
237 goto err;
238 }
239
240 /* Now ret is non-NULL, and we own one of its reference counts. */
241
242 if((s->verify_mode&SSL_VERIFY_PEER)
243 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length
244 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)))
245 {
246 /* We've found the session named by the client, but we don't
247 * want to use it in this context. */
248
249 if (s->sid_ctx_length == 0)
250 {
251 /* application should have used SSL[_CTX]_set_session_id_context
252 * -- we could tolerate this and just pretend we never heard
253 * of this session, but then applications could effectively
254 * disable the session cache by accident without anyone noticing */
255
256 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
257 fatal = 1;
258 goto err;
259 }
260 else
261 {
262#if 0 /* The client cannot always know when a session is not appropriate,
263 * so we shouldn't generate an error message. */
264
265 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
266#endif
267 goto err; /* treat like cache miss */
268 }
269 }
270
271 if (ret->cipher == NULL)
272 {
273 unsigned char buf[5],*p;
274 unsigned long l;
275
276 p=buf;
277 l=ret->cipher_id;
278 l2n(l,p);
279 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
280 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
281 else
282 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
283 if (ret->cipher == NULL)
284 goto err;
285 }
286
287
288#if 0 /* This is way too late. */
289
290 /* If a thread got the session, then 'swaped', and another got
291 * it and then due to a time-out decided to 'Free' it we could
292 * be in trouble. So I'll increment it now, then double decrement
293 * later - am I speaking rubbish?. */
294 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
295#endif
296
297 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
298 {
299 s->ctx->stats.sess_timeout++;
300 /* remove it from the cache */
301 SSL_CTX_remove_session(s->ctx,ret);
302 goto err;
303 }
304
305 s->ctx->stats.sess_hit++;
306
307 /* ret->time=time(NULL); */ /* rezero timeout? */
308 /* again, just leave the session
309 * if it is the same session, we have just incremented and
310 * then decremented the reference count :-) */
311 if (s->session != NULL)
312 SSL_SESSION_free(s->session);
313 s->session=ret;
314 return(1);
315
316 err:
317 if (ret != NULL)
318 SSL_SESSION_free(ret);
319 if (fatal)
320 return -1;
321 else
322 return 0;
323 }
324
325int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
326 {
327 int ret=0;
328 SSL_SESSION *s;
329
330 /* conn_init(); */
331 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
332
333 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
334 s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
335
336 /* Put on the end of the queue unless it is already in the cache */
337 if (s == NULL)
338 SSL_SESSION_list_add(ctx,c);
339
340 /* If the same session if is being 're-added', Free the old
341 * one when the last person stops using it.
342 * This will also work if it is alread in the cache.
343 * The references will go up and then down :-) */
344 if (s != NULL)
345 {
346 SSL_SESSION_free(s);
347 ret=0;
348 }
349 else
350 {
351 ret=1;
352
353 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
354 {
355 while (SSL_CTX_sess_number(ctx) >
356 SSL_CTX_sess_get_cache_size(ctx))
357 {
358 if (!remove_session_lock(ctx,
359 ctx->session_cache_tail, 0))
360 break;
361 else
362 ctx->stats.sess_cache_full++;
363 }
364 }
365 }
366 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
367 return(ret);
368 }
369
370int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
371{
372 return remove_session_lock(ctx, c, 1);
373}
374
375static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
376 {
377 SSL_SESSION *r;
378 int ret=0;
379
380 if ((c != NULL) && (c->session_id_length != 0))
381 {
382 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
383 r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
384 if (r != NULL)
385 {
386 ret=1;
387 SSL_SESSION_list_remove(ctx,c);
388 }
389
390 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
391
392 if (ret)
393 {
394 r->not_resumable=1;
395 if (ctx->remove_session_cb != NULL)
396 ctx->remove_session_cb(ctx,r);
397 SSL_SESSION_free(r);
398 }
399 }
400 else
401 ret=0;
402 return(ret);
403 }
404
405void SSL_SESSION_free(SSL_SESSION *ss)
406 {
407 int i;
408
409 if(ss == NULL)
410 return;
411
412 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
413#ifdef REF_PRINT
414 REF_PRINT("SSL_SESSION",ss);
415#endif
416 if (i > 0) return;
417#ifdef REF_CHECK
418 if (i < 0)
419 {
420 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
421 abort(); /* ok */
422 }
423#endif
424
425 CRYPTO_free_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
426
427 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
428 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
429 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
430 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
431 if (ss->peer != NULL) X509_free(ss->peer);
432 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
433 memset(ss,0,sizeof(*ss));
434 Free(ss);
435 }
436
437int SSL_set_session(SSL *s, SSL_SESSION *session)
438 {
439 int ret=0;
440 SSL_METHOD *meth;
441
442 if (session != NULL)
443 {
444 meth=s->ctx->method->get_ssl_method(session->ssl_version);
445 if (meth == NULL)
446 meth=s->method->get_ssl_method(session->ssl_version);
447 if (meth == NULL)
448 {
449 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
450 return(0);
451 }
452
453 if (meth != s->method)
454 {
455 if (!SSL_set_ssl_method(s,meth))
456 return(0);
457 if (s->ctx->session_timeout == 0)
458 session->timeout=SSL_get_default_timeout(s);
459 else
460 session->timeout=s->ctx->session_timeout;
461 }
462
463 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
464 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
465 if (s->session != NULL)
466 SSL_SESSION_free(s->session);
467 s->session=session;
468 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
469 ret=1;
470 }
471 else
472 {
473 if (s->session != NULL)
474 {
475 SSL_SESSION_free(s->session);
476 s->session=NULL;
477 }
478
479 meth=s->ctx->method;
480 if (meth != s->method)
481 {
482 if (!SSL_set_ssl_method(s,meth))
483 return(0);
484 }
485 ret=1;
486 }
487 return(ret);
488 }
489
490long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
491 {
492 if (s == NULL) return(0);
493 s->timeout=t;
494 return(1);
495 }
496
497long SSL_SESSION_get_timeout(SSL_SESSION *s)
498 {
499 if (s == NULL) return(0);
500 return(s->timeout);
501 }
502
503long SSL_SESSION_get_time(SSL_SESSION *s)
504 {
505 if (s == NULL) return(0);
506 return(s->time);
507 }
508
509long SSL_SESSION_set_time(SSL_SESSION *s, long t)
510 {
511 if (s == NULL) return(0);
512 s->time=t;
513 return(t);
514 }
515
516long SSL_CTX_set_timeout(SSL_CTX *s, long t)
517 {
518 long l;
519 if (s == NULL) return(0);
520 l=s->session_timeout;
521 s->session_timeout=t;
522 return(l);
523 }
524
525long SSL_CTX_get_timeout(SSL_CTX *s)
526 {
527 if (s == NULL) return(0);
528 return(s->session_timeout);
529 }
530
531typedef struct timeout_param_st
532 {
533 SSL_CTX *ctx;
534 long time;
535 LHASH *cache;
536 } TIMEOUT_PARAM;
537
538static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
539 {
540 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
541 {
542 /* The reason we don't call SSL_CTX_remove_session() is to
543 * save on locking overhead */
544 lh_delete(p->cache,(char *)s);
545 SSL_SESSION_list_remove(p->ctx,s);
546 s->not_resumable=1;
547 if (p->ctx->remove_session_cb != NULL)
548 p->ctx->remove_session_cb(p->ctx,s);
549 SSL_SESSION_free(s);
550 }
551 }
552
553void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
554 {
555 unsigned long i;
556 TIMEOUT_PARAM tp;
557
558 tp.ctx=s;
559 tp.cache=s->sessions;
560 if (tp.cache == NULL) return;
561 tp.time=t;
562 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
563 i=tp.cache->down_load;
564 tp.cache->down_load=0;
565 lh_doall_arg(tp.cache,(void (*)())timeout,(char *)&tp);
566 tp.cache->down_load=i;
567 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
568 }
569
570int ssl_clear_bad_session(SSL *s)
571 {
572 if ( (s->session != NULL) &&
573 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
574 !(SSL_in_init(s) || SSL_in_before(s)))
575 {
576 SSL_CTX_remove_session(s->ctx,s->session);
577 return(1);
578 }
579 else
580 return(0);
581 }
582
583/* locked by SSL_CTX in the calling function */
584static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
585 {
586 if ((s->next == NULL) || (s->prev == NULL)) return;
587
588 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
589 { /* last element in list */
590 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
591 { /* only one element in list */
592 ctx->session_cache_head=NULL;
593 ctx->session_cache_tail=NULL;
594 }
595 else
596 {
597 ctx->session_cache_tail=s->prev;
598 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
599 }
600 }
601 else
602 {
603 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
604 { /* first element in list */
605 ctx->session_cache_head=s->next;
606 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
607 }
608 else
609 { /* middle of list */
610 s->next->prev=s->prev;
611 s->prev->next=s->next;
612 }
613 }
614 s->prev=s->next=NULL;
615 }
616
617static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
618 {
619 if ((s->next != NULL) && (s->prev != NULL))
620 SSL_SESSION_list_remove(ctx,s);
621
622 if (ctx->session_cache_head == NULL)
623 {
624 ctx->session_cache_head=s;
625 ctx->session_cache_tail=s;
626 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
627 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
628 }
629 else
630 {
631 s->next=ctx->session_cache_head;
632 s->next->prev=s;
633 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
634 ctx->session_cache_head=s;
635 }
636 }
637
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