2 Unix SMB/CIFS implementation.
3 session handling for utmp and PAM
5 Copyright (C) tridge@samba.org 2001
6 Copyright (C) abartlet@samba.org 2001
7 Copyright (C) Gerald (Jerry) Carter 2006
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /* a "session" is claimed when we do a SessionSetupX operation
24 and is yielded when the corresponding vuid is destroyed.
26 sessions are used to populate utmp and PAM session structures
30 #include "smbd/globals.h"
34 /********************************************************************
35 called when a session is created
36 ********************************************************************/
38 bool session_claim(struct smbd_server_connection
*sconn
, user_struct
*vuser
)
40 struct server_id pid
= sconn_server_id(sconn
);
43 struct sessionid sessionid
;
45 struct db_record
*rec
;
48 vuser
->session_keystr
= NULL
;
50 /* don't register sessions for the guest user - its just too
51 expensive to go through pam session code for browsing etc */
52 if (vuser
->session_info
->guest
) {
56 if (!sessionid_init()) {
60 ZERO_STRUCT(sessionid
);
67 for (i
=1;i
<MAX_SESSION_ID
;i
++) {
70 * This is very inefficient and needs fixing -- vl
73 struct server_id sess_pid
;
75 snprintf(keystr
, sizeof(keystr
), "ID/%d", i
);
77 rec
= sessionid_fetch_record(NULL
, keystr
);
79 DEBUG(1, ("Could not lock \"%s\"\n", keystr
));
83 if (rec
->value
.dsize
!= sizeof(sessionid
)) {
84 DEBUG(1, ("Re-using invalid record\n"));
89 ((char *)rec
->value
.dptr
)
90 + offsetof(struct sessionid
, pid
),
93 if (!process_exists(sess_pid
)) {
94 DEBUG(5, ("%s has died -- re-using session\n",
95 procid_str_static(&sess_pid
)));
102 if (i
== MAX_SESSION_ID
) {
103 SMB_ASSERT(rec
== NULL
);
104 DEBUG(1,("session_claim: out of session IDs "
105 "(max is %d)\n", MAX_SESSION_ID
));
109 snprintf(sessionid
.id_str
, sizeof(sessionid
.id_str
),
110 SESSION_UTMP_TEMPLATE
, i
);
113 snprintf(keystr
, sizeof(keystr
), "ID/%s/%u",
114 procid_str_static(&pid
), vuser
->vuid
);
116 rec
= sessionid_fetch_record(NULL
, keystr
);
118 DEBUG(1, ("Could not lock \"%s\"\n", keystr
));
122 snprintf(sessionid
.id_str
, sizeof(sessionid
.id_str
),
123 SESSION_TEMPLATE
, (long unsigned int)sys_getpid(),
127 SMB_ASSERT(rec
!= NULL
);
129 /* If 'hostname lookup' == yes, then do the DNS lookup. This is
130 needed because utmp and PAM both expect DNS names
132 client_name() handles this case internally.
135 fstrcpy(sessionid
.username
, vuser
->session_info
->unix_name
);
136 fstrcpy(sessionid
.hostname
, sconn
->client_id
.name
);
137 sessionid
.id_num
= i
; /* Only valid for utmp sessions */
139 sessionid
.uid
= vuser
->session_info
->utok
.uid
;
140 sessionid
.gid
= vuser
->session_info
->utok
.gid
;
141 fstrcpy(sessionid
.remote_machine
, get_remote_machine_name());
142 fstrcpy(sessionid
.ip_addr_str
, sconn
->client_id
.addr
);
143 sessionid
.connect_start
= time(NULL
);
145 if (!smb_pam_claim_session(sessionid
.username
, sessionid
.id_str
,
146 sessionid
.hostname
)) {
147 DEBUG(1,("pam_session rejected the session for %s [%s]\n",
148 sessionid
.username
, sessionid
.id_str
));
154 data
.dptr
= (uint8
*)&sessionid
;
155 data
.dsize
= sizeof(sessionid
);
157 status
= rec
->store(rec
, data
, TDB_REPLACE
);
161 if (!NT_STATUS_IS_OK(status
)) {
162 DEBUG(1,("session_claim: unable to create session id "
163 "record: %s\n", nt_errstr(status
)));
168 sys_utmp_claim(sessionid
.username
, sessionid
.hostname
,
169 sessionid
.ip_addr_str
,
170 sessionid
.id_str
, sessionid
.id_num
);
173 vuser
->session_keystr
= talloc_strdup(vuser
, keystr
);
174 if (!vuser
->session_keystr
) {
175 DEBUG(0, ("session_claim: talloc_strdup() failed for session_keystr\n"));
181 /********************************************************************
182 called when a session is destroyed
183 ********************************************************************/
185 void session_yield(user_struct
*vuser
)
187 struct sessionid sessionid
;
188 struct db_record
*rec
;
190 if (!vuser
->session_keystr
) {
194 rec
= sessionid_fetch_record(NULL
, vuser
->session_keystr
);
199 if (rec
->value
.dsize
!= sizeof(sessionid
))
202 memcpy(&sessionid
, rec
->value
.dptr
, sizeof(sessionid
));
205 sys_utmp_yield(sessionid
.username
, sessionid
.hostname
,
206 sessionid
.ip_addr_str
,
207 sessionid
.id_str
, sessionid
.id_num
);
210 smb_pam_close_session(sessionid
.username
, sessionid
.id_str
,
213 rec
->delete_rec(rec
);
218 /********************************************************************
219 ********************************************************************/
221 struct session_list
{
224 struct sessionid
*sessions
;
227 static int gather_sessioninfo(const char *key
, struct sessionid
*session
,
230 struct session_list
*sesslist
= (struct session_list
*)private_data
;
232 sesslist
->sessions
= TALLOC_REALLOC_ARRAY(
233 sesslist
->mem_ctx
, sesslist
->sessions
, struct sessionid
,
236 if (!sesslist
->sessions
) {
241 memcpy(&sesslist
->sessions
[sesslist
->count
], session
,
242 sizeof(struct sessionid
));
246 DEBUG(7, ("gather_sessioninfo session from %s@%s\n",
247 session
->username
, session
->remote_machine
));
252 /********************************************************************
253 ********************************************************************/
255 int list_sessions(TALLOC_CTX
*mem_ctx
, struct sessionid
**session_list
)
257 struct session_list sesslist
;
260 sesslist
.mem_ctx
= mem_ctx
;
262 sesslist
.sessions
= NULL
;
264 ret
= sessionid_traverse_read(gather_sessioninfo
, (void *) &sesslist
);
266 DEBUG(3, ("Session traverse failed\n"));
267 SAFE_FREE(sesslist
.sessions
);
268 *session_list
= NULL
;
272 *session_list
= sesslist
.sessions
;
273 return sesslist
.count
;