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/*
Unix SMB/Netbios implementation.
Version 2.0
session handling for utmp and PAM
Copyright (C) tridge@samba.org 2001
Copyright (C) abartlet@pcug.org.au 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* a "session" is claimed when we do a SessionSetupX operation
and is yielded when the corresponding vuid is destroyed.
sessions are used to populate utmp and PAM session structures
*/
#include "includes.h"
#if defined(WITH_PAM) || defined(WITH_UTMP)
static TDB_CONTEXT *tdb;
struct sessionid {
fstring username;
fstring hostname;
fstring id_str;
uint32 id_num;
uint32 pid;
};
/* called when a session is created */
BOOL session_claim(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
int i;
TDB_DATA data;
struct sessionid sessionid;
pstring dbuf;
int dlen;
uint32 pid = (uint32)sys_getpid();
TDB_DATA key;
fstring keystr;
char * hostname;
vuser->session_id = 0;
/* don't register sessions for the guest user - its just too
expensive to go through pam session code for browsing etc */
if (strequal(vuser->user.unix_name,lp_guestaccount(-1))) {
return True;
}
if (!tdb) {
tdb = tdb_open_log(lock_path("sessionid.tdb"), 0, TDB_CLEAR_IF_FIRST,
O_RDWR | O_CREAT, 0644);
if (!tdb) {
DEBUG(1,("session_claim: failed to open sessionid tdb\n"));
return False;
}
}
ZERO_STRUCT(sessionid);
data.dptr = NULL;
data.dsize = 0;
for (i=1;i<MAX_SESSION_ID;i++) {
slprintf(keystr, sizeof(keystr)-1, "ID/%d", i);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
if (tdb_store(tdb, key, data, TDB_INSERT) == 0) break;
}
if (i == MAX_SESSION_ID) {
DEBUG(1,("session_claim: out of session IDs (max is %d)\n",
MAX_SESSION_ID));
return False;
}
hostname = client_name();
if (strequal(hostname,"UNKNOWN"))
hostname = client_addr();
fstrcpy(sessionid.username, vuser->user.unix_name);
fstrcpy(sessionid.hostname, hostname);
slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1, SESSION_TEMPLATE, i);
sessionid.id_num = i;
sessionid.pid = pid;
if (!smb_pam_claim_session(sessionid.username, sessionid.id_str, sessionid.hostname)) {
DEBUG(1,("pam_session rejected the session for %s [%s]\n",
sessionid.username, sessionid.id_str));
tdb_delete(tdb, key);
return False;
}
dlen = tdb_pack(dbuf, sizeof(dbuf), "fffdd",
sessionid.username, sessionid.hostname, sessionid.id_str,
sessionid.id_num, sessionid.pid);
data.dptr = dbuf;
data.dsize = dlen;
if (tdb_store(tdb, key, data, TDB_MODIFY) != 0) {
DEBUG(1,("session_claim: unable to create session id record\n"));
return False;
}
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_claim(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
vuser->session_id = i;
return True;
}
/* called when a session is destroyed */
void session_yield(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
TDB_DATA data;
struct sessionid sessionid;
TDB_DATA key;
fstring keystr;
if (!tdb) return;
if (vuser->session_id == 0) {
return;
}
slprintf(keystr, sizeof(keystr)-1, "ID/%d", vuser->session_id);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
data = tdb_fetch(tdb, key);
if (data.dptr == NULL) {
return;
}
tdb_unpack(data.dptr, data.dsize, "fffdd",
&sessionid.username, &sessionid.hostname, &sessionid.id_str,
&sessionid.id_num, &sessionid.pid);
safe_free(data.dptr);
data.dptr = NULL;
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_yield(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
smb_pam_close_session(sessionid.username, sessionid.id_str, sessionid.hostname);
tdb_delete(tdb, key);
}
#else
/* null functions - no session support needed */
BOOL session_claim(uint16 vuid) { return True; }
void session_yield(uint16 vuid) {}
#endif
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