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"
32 /********************************************************************
33 called when a session is created
34 ********************************************************************/
36 bool session_claim(struct server_id pid
, user_struct
*vuser
)
40 struct sessionid sessionid
;
42 const char * hostname
;
43 struct db_record
*rec
;
45 char addr
[INET6_ADDRSTRLEN
];
47 vuser
->session_keystr
= NULL
;
49 /* don't register sessions for the guest user - its just too
50 expensive to go through pam session code for browsing etc */
51 if (vuser
->server_info
->guest
) {
55 if (!sessionid_init()) {
59 ZERO_STRUCT(sessionid
);
66 for (i
=1;i
<MAX_SESSION_ID
;i
++) {
69 * This is very inefficient and needs fixing -- vl
72 struct server_id sess_pid
;
74 snprintf(keystr
, sizeof(keystr
), "ID/%d", i
);
76 rec
= sessionid_fetch_record(NULL
, keystr
);
78 DEBUG(1, ("Could not lock \"%s\"\n", keystr
));
82 if (rec
->value
.dsize
!= sizeof(sessionid
)) {
83 DEBUG(1, ("Re-using invalid record\n"));
88 ((char *)rec
->value
.dptr
)
89 + offsetof(struct sessionid
, pid
),
92 if (!process_exists(sess_pid
)) {
93 DEBUG(5, ("%s has died -- re-using session\n",
94 procid_str_static(&sess_pid
)));
101 if (i
== MAX_SESSION_ID
) {
102 SMB_ASSERT(rec
== NULL
);
103 DEBUG(1,("session_claim: out of session IDs "
104 "(max is %d)\n", MAX_SESSION_ID
));
108 snprintf(sessionid
.id_str
, sizeof(sessionid
.id_str
),
109 SESSION_UTMP_TEMPLATE
, i
);
112 snprintf(keystr
, sizeof(keystr
), "ID/%s/%u",
113 procid_str_static(&pid
), vuser
->vuid
);
115 rec
= sessionid_fetch_record(NULL
, keystr
);
117 DEBUG(1, ("Could not lock \"%s\"\n", keystr
));
121 snprintf(sessionid
.id_str
, sizeof(sessionid
.id_str
),
122 SESSION_TEMPLATE
, (long unsigned int)sys_getpid(),
126 SMB_ASSERT(rec
!= NULL
);
128 /* If 'hostname lookup' == yes, then do the DNS lookup. This is
129 needed because utmp and PAM both expect DNS names
131 client_name() handles this case internally.
134 hostname
= client_name(get_client_fd());
135 if (strcmp(hostname
, "UNKNOWN") == 0) {
136 hostname
= client_addr(get_client_fd(),addr
,sizeof(addr
));
139 fstrcpy(sessionid
.username
, vuser
->server_info
->unix_name
);
140 fstrcpy(sessionid
.hostname
, hostname
);
141 sessionid
.id_num
= i
; /* Only valid for utmp sessions */
143 sessionid
.uid
= vuser
->server_info
->utok
.uid
;
144 sessionid
.gid
= vuser
->server_info
->utok
.gid
;
145 fstrcpy(sessionid
.remote_machine
, get_remote_machine_name());
146 fstrcpy(sessionid
.ip_addr_str
,
147 client_addr(get_client_fd(),addr
,sizeof(addr
)));
148 sessionid
.connect_start
= time(NULL
);
150 if (!smb_pam_claim_session(sessionid
.username
, sessionid
.id_str
,
151 sessionid
.hostname
)) {
152 DEBUG(1,("pam_session rejected the session for %s [%s]\n",
153 sessionid
.username
, sessionid
.id_str
));
159 data
.dptr
= (uint8
*)&sessionid
;
160 data
.dsize
= sizeof(sessionid
);
162 status
= rec
->store(rec
, data
, TDB_REPLACE
);
166 if (!NT_STATUS_IS_OK(status
)) {
167 DEBUG(1,("session_claim: unable to create session id "
168 "record: %s\n", nt_errstr(status
)));
173 sys_utmp_claim(sessionid
.username
, sessionid
.hostname
,
174 sessionid
.ip_addr_str
,
175 sessionid
.id_str
, sessionid
.id_num
);
178 vuser
->session_keystr
= talloc_strdup(vuser
, keystr
);
179 if (!vuser
->session_keystr
) {
180 DEBUG(0, ("session_claim: talloc_strdup() failed for session_keystr\n"));
186 /********************************************************************
187 called when a session is destroyed
188 ********************************************************************/
190 void session_yield(user_struct
*vuser
)
192 struct sessionid sessionid
;
193 struct db_record
*rec
;
195 if (!vuser
->session_keystr
) {
199 rec
= sessionid_fetch_record(NULL
, vuser
->session_keystr
);
204 if (rec
->value
.dsize
!= sizeof(sessionid
))
207 memcpy(&sessionid
, rec
->value
.dptr
, sizeof(sessionid
));
210 sys_utmp_yield(sessionid
.username
, sessionid
.hostname
,
211 sessionid
.ip_addr_str
,
212 sessionid
.id_str
, sessionid
.id_num
);
215 smb_pam_close_session(sessionid
.username
, sessionid
.id_str
,
218 rec
->delete_rec(rec
);
223 /********************************************************************
224 ********************************************************************/
226 struct session_list
{
229 struct sessionid
*sessions
;
232 static int gather_sessioninfo(const char *key
, struct sessionid
*session
,
235 struct session_list
*sesslist
= (struct session_list
*)private_data
;
237 sesslist
->sessions
= TALLOC_REALLOC_ARRAY(
238 sesslist
->mem_ctx
, sesslist
->sessions
, struct sessionid
,
241 if (!sesslist
->sessions
) {
246 memcpy(&sesslist
->sessions
[sesslist
->count
], session
,
247 sizeof(struct sessionid
));
251 DEBUG(7, ("gather_sessioninfo session from %s@%s\n",
252 session
->username
, session
->remote_machine
));
257 /********************************************************************
258 ********************************************************************/
260 int list_sessions(TALLOC_CTX
*mem_ctx
, struct sessionid
**session_list
)
262 struct session_list sesslist
;
265 sesslist
.mem_ctx
= mem_ctx
;
267 sesslist
.sessions
= NULL
;
269 ret
= sessionid_traverse_read(gather_sessioninfo
, (void *) &sesslist
);
271 DEBUG(3, ("Session traverse failed\n"));
272 SAFE_FREE(sesslist
.sessions
);
273 *session_list
= NULL
;
277 *session_list
= sesslist
.sessions
;
278 return sesslist
.count
;