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366 lines
11 KiB
C
366 lines
11 KiB
C
/*
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* This file implements the CLIENT Session ID cache.
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*
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* $Id: sslnonce.c,v 1.12 2002/04/04 00:14:11 nelsonb%netscape.com Exp $
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*/
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#include "nssrenam.h"
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#include "cert.h"
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#include "secitem.h"
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#include "ssl.h"
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#include "sslimpl.h"
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#include "sslproto.h"
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#include "nssilock.h"
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#include "nsslocks.h"
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#if (defined(XP_UNIX) || defined(XP_WIN) || defined(_WINDOWS) || defined(XP_BEOS)) && !defined(_WIN32_WCE)
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#include <time.h>
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#endif
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PRUint32 ssl_sid_timeout = 100;
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PRUint32 ssl3_sid_timeout = 86400L; /* 24 hours */
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static sslSessionID *cache;
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static PZLock * cacheLock;
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/* sids can be in one of 4 states:
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*
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* never_cached, created, but not yet put into cache.
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* in_client_cache, in the client cache's linked list.
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* in_server_cache, entry came from the server's cache file.
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* invalid_cache has been removed from the cache.
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*/
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#define LOCK_CACHE lock_cache()
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#define UNLOCK_CACHE PZ_Unlock(cacheLock)
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static void
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lock_cache(void)
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{
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/* XXX Since the client session cache has no init function, we must
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* XXX init the cacheLock on the first call. Fix in NSS 3.0.
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*/
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if (!cacheLock)
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nss_InitLock(&cacheLock, nssILockCache);
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PZ_Lock(cacheLock);
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}
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/* BEWARE: This function gets called for both client and server SIDs !!
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* If the unreferenced sid is not in the cache, Free sid and its contents.
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*/
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static void
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ssl_DestroySID(sslSessionID *sid)
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{
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SSL_TRC(8, ("SSL: destroy sid: sid=0x%x cached=%d", sid, sid->cached));
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PORT_Assert((sid->references == 0));
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if (sid->cached == in_client_cache)
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return; /* it will get taken care of next time cache is traversed. */
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if (sid->version < SSL_LIBRARY_VERSION_3_0) {
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SECITEM_ZfreeItem(&sid->u.ssl2.masterKey, PR_FALSE);
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SECITEM_ZfreeItem(&sid->u.ssl2.cipherArg, PR_FALSE);
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}
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if (sid->peerID != NULL)
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PORT_Free((void *)sid->peerID); /* CONST */
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if (sid->urlSvrName != NULL)
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PORT_Free((void *)sid->urlSvrName); /* CONST */
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if ( sid->peerCert ) {
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CERT_DestroyCertificate(sid->peerCert);
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}
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if ( sid->localCert ) {
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CERT_DestroyCertificate(sid->localCert);
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}
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PORT_ZFree(sid, sizeof(sslSessionID));
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}
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/* BEWARE: This function gets called for both client and server SIDs !!
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* Decrement reference count, and
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* free sid if ref count is zero, and sid is not in the cache.
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* Does NOT remove from the cache first.
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* If the sid is still in the cache, it is left there until next time
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* the cache list is traversed.
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*/
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static void
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ssl_FreeLockedSID(sslSessionID *sid)
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{
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PORT_Assert(sid->references >= 1);
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if (--sid->references == 0) {
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ssl_DestroySID(sid);
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}
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}
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/* BEWARE: This function gets called for both client and server SIDs !!
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* Decrement reference count, and
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* free sid if ref count is zero, and sid is not in the cache.
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* Does NOT remove from the cache first.
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* These locks are necessary because the sid _might_ be in the cache list.
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*/
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void
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ssl_FreeSID(sslSessionID *sid)
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{
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LOCK_CACHE;
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ssl_FreeLockedSID(sid);
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UNLOCK_CACHE;
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}
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/************************************************************************/
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/*
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** Lookup sid entry in cache by Address, port, and peerID string.
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** If found, Increment reference count, and return pointer to caller.
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** If it has timed out or ref count is zero, remove from list and free it.
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*/
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sslSessionID *
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ssl_LookupSID(const PRIPv6Addr *addr, PRUint16 port, const char *peerID,
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const char * urlSvrName)
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{
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sslSessionID **sidp;
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sslSessionID * sid;
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PRUint32 now;
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if (!urlSvrName)
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return NULL;
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now = ssl_Time();
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LOCK_CACHE;
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sidp = &cache;
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while ((sid = *sidp) != 0) {
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PORT_Assert(sid->cached == in_client_cache);
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PORT_Assert(sid->references >= 1);
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SSL_TRC(8, ("SSL: Lookup1: sid=0x%x", sid));
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if (sid->expirationTime < now || !sid->references) {
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/*
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** This session-id timed out, or was orphaned.
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** Don't even care who it belongs to, blow it out of our cache.
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*/
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SSL_TRC(7, ("SSL: lookup1, throwing sid out, age=%d refs=%d",
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now - sid->creationTime, sid->references));
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*sidp = sid->next; /* delink it from the list. */
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sid->cached = invalid_cache; /* mark not on list. */
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if (!sid->references)
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ssl_DestroySID(sid);
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else
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ssl_FreeLockedSID(sid); /* drop ref count, free. */
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} else if (!memcmp(&sid->addr, addr, sizeof(PRIPv6Addr)) && /* server IP addr matches */
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(sid->port == port) && /* server port matches */
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/* proxy (peerID) matches */
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(((peerID == NULL) && (sid->peerID == NULL)) ||
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((peerID != NULL) && (sid->peerID != NULL) &&
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PORT_Strcmp(sid->peerID, peerID) == 0)) &&
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/* is cacheable */
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(sid->version < SSL_LIBRARY_VERSION_3_0 ||
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sid->u.ssl3.resumable) &&
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/* server hostname matches. */
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(sid->urlSvrName != NULL) &&
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((0 == PORT_Strcmp(urlSvrName, sid->urlSvrName)) ||
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((sid->peerCert != NULL) && (SECSuccess ==
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CERT_VerifyCertName(sid->peerCert, urlSvrName))) )
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) {
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/* Hit */
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sid->lastAccessTime = now;
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sid->references++;
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break;
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} else {
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sidp = &sid->next;
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}
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}
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UNLOCK_CACHE;
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return sid;
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}
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/*
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** Add an sid to the cache or return a previously cached entry to the cache.
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** Although this is static, it is called via ss->sec.cache().
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*/
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static void
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CacheSID(sslSessionID *sid)
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{
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PRUint32 expirationPeriod;
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SSL_TRC(8, ("SSL: Cache: sid=0x%x cached=%d addr=0x%08x%08x%08x%08x port=0x%04x "
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"time=%x cached=%d",
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sid, sid->cached, sid->addr.pr_s6_addr32[0],
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sid->addr.pr_s6_addr32[1], sid->addr.pr_s6_addr32[2],
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sid->addr.pr_s6_addr32[3], sid->port, sid->creationTime,
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sid->cached));
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if (sid->cached == in_client_cache)
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return;
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/* XXX should be different trace for version 2 vs. version 3 */
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if (sid->version < SSL_LIBRARY_VERSION_3_0) {
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expirationPeriod = ssl_sid_timeout;
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PRINT_BUF(8, (0, "sessionID:",
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sid->u.ssl2.sessionID, sizeof(sid->u.ssl2.sessionID)));
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PRINT_BUF(8, (0, "masterKey:",
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sid->u.ssl2.masterKey.data, sid->u.ssl2.masterKey.len));
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PRINT_BUF(8, (0, "cipherArg:",
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sid->u.ssl2.cipherArg.data, sid->u.ssl2.cipherArg.len));
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} else {
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if (sid->u.ssl3.sessionIDLength == 0)
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return;
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expirationPeriod = ssl3_sid_timeout;
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PRINT_BUF(8, (0, "sessionID:",
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sid->u.ssl3.sessionID, sid->u.ssl3.sessionIDLength));
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}
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PORT_Assert(sid->creationTime != 0 && sid->expirationTime != 0);
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if (!sid->creationTime)
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sid->lastAccessTime = sid->creationTime = ssl_Time();
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if (!sid->expirationTime)
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sid->expirationTime = sid->creationTime + expirationPeriod;
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/*
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* Put sid into the cache. Bump reference count to indicate that
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* cache is holding a reference. Uncache will reduce the cache
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* reference.
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*/
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LOCK_CACHE;
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sid->references++;
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sid->cached = in_client_cache;
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sid->next = cache;
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cache = sid;
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UNLOCK_CACHE;
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}
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/*
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* If sid "zap" is in the cache,
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* removes sid from cache, and decrements reference count.
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* Caller must hold cache lock.
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*/
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static void
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UncacheSID(sslSessionID *zap)
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{
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sslSessionID **sidp = &cache;
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sslSessionID *sid;
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if (zap->cached != in_client_cache) {
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return;
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}
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SSL_TRC(8,("SSL: Uncache: zap=0x%x cached=%d addr=0x%08x%08x%08x%08x port=0x%04x "
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"time=%x cipher=%d",
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zap, zap->cached, zap->addr.pr_s6_addr32[0],
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zap->addr.pr_s6_addr32[1], zap->addr.pr_s6_addr32[2],
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zap->addr.pr_s6_addr32[3], zap->port, zap->creationTime,
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zap->u.ssl2.cipherType));
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if (zap->version < SSL_LIBRARY_VERSION_3_0) {
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PRINT_BUF(8, (0, "sessionID:",
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zap->u.ssl2.sessionID, sizeof(zap->u.ssl2.sessionID)));
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PRINT_BUF(8, (0, "masterKey:",
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zap->u.ssl2.masterKey.data, zap->u.ssl2.masterKey.len));
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PRINT_BUF(8, (0, "cipherArg:",
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zap->u.ssl2.cipherArg.data, zap->u.ssl2.cipherArg.len));
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}
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/* See if it's in the cache, if so nuke it */
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while ((sid = *sidp) != 0) {
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if (sid == zap) {
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/*
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** Bingo. Reduce reference count by one so that when
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** everyone is done with the sid we can free it up.
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*/
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*sidp = zap->next;
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zap->cached = invalid_cache;
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ssl_FreeLockedSID(zap);
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return;
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}
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sidp = &sid->next;
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}
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}
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/* If sid "zap" is in the cache,
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* removes sid from cache, and decrements reference count.
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* Although this function is static, it is called externally via
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* ss->sec.uncache().
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*/
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static void
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LockAndUncacheSID(sslSessionID *zap)
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{
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LOCK_CACHE;
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UncacheSID(zap);
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UNLOCK_CACHE;
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}
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/* choose client or server cache functions for this sslsocket. */
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void
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ssl_ChooseSessionIDProcs(sslSecurityInfo *sec)
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{
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if (sec->isServer) {
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sec->cache = ssl_sid_cache;
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sec->uncache = ssl_sid_uncache;
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} else {
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sec->cache = CacheSID;
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sec->uncache = LockAndUncacheSID;
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}
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}
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/* wipe out the entire client session cache. */
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void
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SSL_ClearSessionCache(void)
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{
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LOCK_CACHE;
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while(cache != NULL)
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UncacheSID(cache);
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UNLOCK_CACHE;
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}
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/* returns an unsigned int containing the number of seconds in PR_Now() */
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PRUint32
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ssl_Time(void)
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{
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PRUint32 myTime;
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#if (defined(XP_UNIX) || defined(XP_WIN) || defined(_WINDOWS) || defined(XP_BEOS)) && !defined(_WIN32_WCE)
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myTime = time(NULL); /* accurate until the year 2038. */
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#else
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/* portable, but possibly slower */
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PRTime now;
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PRInt64 ll;
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now = PR_Now();
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LL_I2L(ll, 1000000L);
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LL_DIV(now, now, ll);
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LL_L2UI(myTime, now);
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#endif
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return myTime;
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}
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