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/*
Unix SMB/CIFS implementation.
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"
static TDB_CONTEXT *tdb;
/* called when a session is created */
BOOL session_claim(user_struct *vuser)
{
int i = 0;
TDB_DATA data;
struct sockaddr sa;
struct in_addr *client_ip;
struct sessionid sessionid;
uint32 pid = (uint32)sys_getpid();
TDB_DATA key;
fstring keystr;
char * hostname;
int tdb_store_flag; /* If using utmp, we do an inital 'lock hold' store,
but we don't need this if we are just using the
(unique) pid/vuid combination */
vuser->session_keystr = NULL;
/* don't register sessions for the guest user - its just too
expensive to go through pam session code for browsing etc */
if (vuser->guest) {
return True;
}
if (!tdb) {
tdb = tdb_open_ex(lock_path("sessionid.tdb"), 0, TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
O_RDWR | O_CREAT, 0644, smbd_tdb_log);
if (!tdb) {
DEBUG(1,("session_claim: failed to open sessionid tdb\n"));
return False;
}
}
ZERO_STRUCT(sessionid);
data.dptr = NULL;
data.dsize = 0;
if (lp_utmp()) {
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;
}
slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1, SESSION_UTMP_TEMPLATE, i);
tdb_store_flag = TDB_MODIFY;
} else
{
slprintf(keystr, sizeof(keystr)-1, "ID/%lu/%u",
(long unsigned int)sys_getpid(),
vuser->vuid);
slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1,
SESSION_TEMPLATE, (long unsigned int)sys_getpid(),
vuser->vuid);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
tdb_store_flag = TDB_REPLACE;
}
/* If 'hostname lookup' == yes, then do the DNS lookup. This is
needed because utmp and PAM both expect DNS names
client_name() handles this case internally.
*/
hostname = client_name();
if (strcmp(hostname, "UNKNOWN") == 0) {
hostname = client_addr();
}
fstrcpy(sessionid.username, vuser->user.unix_name);
fstrcpy(sessionid.hostname, hostname);
sessionid.id_num = i; /* Only valid for utmp sessions */
sessionid.pid = pid;
sessionid.uid = vuser->uid;
sessionid.gid = vuser->gid;
fstrcpy(sessionid.remote_machine, get_remote_machine_name());
fstrcpy(sessionid.ip_addr, client_addr());
client_ip = client_inaddr(&sa);
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));
if (tdb_store_flag == TDB_MODIFY) {
tdb_delete(tdb, key);
}
return False;
}
data.dptr = (char *)&sessionid;
data.dsize = sizeof(sessionid);
if (tdb_store(tdb, key, data, tdb_store_flag) != 0) {
DEBUG(1,("session_claim: unable to create session id record\n"));
return False;
}
if (lp_utmp()) {
sys_utmp_claim(sessionid.username, sessionid.hostname,
client_ip,
sessionid.id_str, sessionid.id_num);
}
vuser->session_keystr = strdup(keystr);
if (!vuser->session_keystr) {
DEBUG(0, ("session_claim: strdup() failed for session_keystr\n"));
return False;
}
return True;
}
/* called when a session is destroyed */
void session_yield(user_struct *vuser)
{
TDB_DATA dbuf;
struct sessionid sessionid;
struct in_addr *client_ip;
TDB_DATA key;
if (!tdb) return;
if (!vuser->session_keystr) {
return;
}
key.dptr = vuser->session_keystr;
key.dsize = strlen(vuser->session_keystr)+1;
dbuf = tdb_fetch(tdb, key);
if (dbuf.dsize != sizeof(sessionid))
return;
memcpy(&sessionid, dbuf.dptr, sizeof(sessionid));
client_ip = interpret_addr2(sessionid.ip_addr);
SAFE_FREE(dbuf.dptr);
if (lp_utmp()) {
sys_utmp_yield(sessionid.username, sessionid.hostname,
client_ip,
sessionid.id_str, sessionid.id_num);
}
smb_pam_close_session(sessionid.username, sessionid.id_str, sessionid.hostname);
tdb_delete(tdb, key);
}
static BOOL session_traverse(int (*fn)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *), void *state)
{
if (!tdb) {
DEBUG(3, ("No tdb opened\n"));
return False;
}
tdb_traverse(tdb, fn, state);
return True;
}
struct session_list {
int count;
struct sessionid *sessions;
};
static int gather_sessioninfo(TDB_CONTEXT *stdb, TDB_DATA kbuf, TDB_DATA dbuf,
void *state)
{
struct session_list *sesslist = (struct session_list *) state;
const struct sessionid *current = (const struct sessionid *) dbuf.dptr;
sesslist->count += 1;
sesslist->sessions = REALLOC(sesslist->sessions, sesslist->count *
sizeof(struct sessionid));
memcpy(&sesslist->sessions[sesslist->count - 1], current,
sizeof(struct sessionid));
DEBUG(7,("gather_sessioninfo session from %s@%s\n",
current->username, current->remote_machine));
return 0;
}
int list_sessions(struct sessionid **session_list)
{
struct session_list sesslist;
sesslist.count = 0;
sesslist.sessions = NULL;
if (!session_traverse(gather_sessioninfo, (void *) &sesslist)) {
DEBUG(3, ("Session traverse failed\n"));
SAFE_FREE(sesslist.sessions);
*session_list = NULL;
return 0;
}
*session_list = sesslist.sessions;
return sesslist.count;
}
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