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
31 /********************************************************************
32 ********************************************************************/
34 static struct db_context *session_db_ctx(void)
36 static struct db_context *ctx;
41 ctx = db_open(NULL, lock_path("sessionid.tdb"), 0,
42 TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
43 O_RDWR | O_CREAT, 0644);
47 BOOL session_init(void)
49 if (session_db_ctx() == NULL) {
50 DEBUG(1,("session_init: failed to open sessionid tdb\n"));
57 /********************************************************************
58 called when a session is created
59 ********************************************************************/
61 BOOL session_claim(user_struct *vuser)
66 struct in_addr *client_ip;
67 struct sessionid sessionid;
68 struct server_id pid = procid_self();
71 struct db_context *ctx;
72 struct db_record *rec;
75 vuser->session_keystr = NULL;
77 /* don't register sessions for the guest user - its just too
78 expensive to go through pam session code for browsing etc */
83 if (!(ctx = session_db_ctx())) {
87 ZERO_STRUCT(sessionid);
94 for (i=1;i<MAX_SESSION_ID;i++) {
97 * This is very inefficient and needs fixing -- vl
100 struct server_id sess_pid;
102 snprintf(keystr, sizeof(keystr), "ID/%d", i);
103 key = string_term_tdb_data(keystr);
105 rec = ctx->fetch_locked(ctx, NULL, key);
108 DEBUG(1, ("Could not lock \"%s\"\n", keystr));
112 if (rec->value.dsize != sizeof(sessionid)) {
113 DEBUG(1, ("Re-using invalid record\n"));
117 sess_pid = ((struct sessionid *)rec->value.dptr)->pid;
119 if (!process_exists(sess_pid)) {
120 DEBUG(5, ("%s has died -- re-using session\n",
121 procid_str_static(&sess_pid)));
128 if (i == MAX_SESSION_ID) {
129 SMB_ASSERT(rec == NULL);
130 DEBUG(1,("session_claim: out of session IDs "
131 "(max is %d)\n", MAX_SESSION_ID));
135 snprintf(sessionid.id_str, sizeof(sessionid.id_str),
136 SESSION_UTMP_TEMPLATE, i);
139 snprintf(keystr, sizeof(keystr), "ID/%s/%u",
140 procid_str_static(&pid), vuser->vuid);
141 key = string_term_tdb_data(keystr);
143 rec = ctx->fetch_locked(ctx, NULL, key);
146 DEBUG(1, ("Could not lock \"%s\"\n", keystr));
150 snprintf(sessionid.id_str, sizeof(sessionid.id_str),
151 SESSION_TEMPLATE, (long unsigned int)sys_getpid(),
155 SMB_ASSERT(rec != NULL);
157 /* If 'hostname lookup' == yes, then do the DNS lookup. This is
158 needed because utmp and PAM both expect DNS names
160 client_name() handles this case internally.
163 hostname = client_name();
164 if (strcmp(hostname, "UNKNOWN") == 0) {
165 hostname = client_addr();
168 fstrcpy(sessionid.username, vuser->user.unix_name);
169 fstrcpy(sessionid.hostname, hostname);
170 sessionid.id_num = i; /* Only valid for utmp sessions */
172 sessionid.uid = vuser->uid;
173 sessionid.gid = vuser->gid;
174 fstrcpy(sessionid.remote_machine, get_remote_machine_name());
175 fstrcpy(sessionid.ip_addr, client_addr());
176 sessionid.connect_start = time(NULL);
178 client_ip = client_inaddr(&sa);
180 if (!smb_pam_claim_session(sessionid.username, sessionid.id_str,
181 sessionid.hostname)) {
182 DEBUG(1,("pam_session rejected the session for %s [%s]\n",
183 sessionid.username, sessionid.id_str));
189 data.dptr = (uint8 *)&sessionid;
190 data.dsize = sizeof(sessionid);
192 status = rec->store(rec, data, TDB_REPLACE);
196 if (!NT_STATUS_IS_OK(status)) {
197 DEBUG(1,("session_claim: unable to create session id "
198 "record: %s\n", nt_errstr(status)));
203 sys_utmp_claim(sessionid.username, sessionid.hostname,
205 sessionid.id_str, sessionid.id_num);
210 vuser->session_keystr = talloc_strdup(vuser, keystr);
211 if (!vuser->session_keystr) {
212 DEBUG(0, ("session_claim: talloc_strdup() failed for "
213 "session_keystr\n"));
219 /********************************************************************
220 called when a session is destroyed
221 ********************************************************************/
223 void session_yield(user_struct *vuser)
226 struct sessionid sessionid;
227 struct in_addr *client_ip;
228 struct db_context *ctx;
229 struct db_record *rec;
231 if (!(ctx = session_db_ctx())) return;
233 if (!vuser->session_keystr) {
237 key = string_term_tdb_data(vuser->session_keystr);
239 if (!(rec = ctx->fetch_locked(ctx, NULL, key))) {
243 if (rec->value.dsize != sizeof(sessionid))
246 memcpy(&sessionid, rec->value.dptr, sizeof(sessionid));
248 client_ip = interpret_addr2(sessionid.ip_addr);
251 sys_utmp_yield(sessionid.username, sessionid.hostname,
253 sessionid.id_str, sessionid.id_num);
256 smb_pam_close_session(sessionid.username, sessionid.id_str,
259 rec->delete_rec(rec);
264 /********************************************************************
265 ********************************************************************/
267 static BOOL session_traverse(int (*fn)(struct db_record *db,
271 struct db_context *ctx;
273 if (!(ctx = session_db_ctx())) {
274 DEBUG(3, ("No tdb opened\n"));
278 ctx->traverse_read(ctx, fn, private_data);
282 /********************************************************************
283 ********************************************************************/
285 struct session_list {
288 struct sessionid *sessions;
291 static int gather_sessioninfo(struct db_record *rec, void *state)
293 struct session_list *sesslist = (struct session_list *) state;
294 const struct sessionid *current =
295 (const struct sessionid *) rec->value.dptr;
297 sesslist->sessions = TALLOC_REALLOC_ARRAY(
298 sesslist->mem_ctx, sesslist->sessions, struct sessionid,
301 if (!sesslist->sessions) {
306 memcpy(&sesslist->sessions[sesslist->count], current,
307 sizeof(struct sessionid));
311 DEBUG(7,("gather_sessioninfo session from %s@%s\n",
312 current->username, current->remote_machine));
317 /********************************************************************
318 ********************************************************************/
320 int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
322 struct session_list sesslist;
324 sesslist.mem_ctx = mem_ctx;
326 sesslist.sessions = NULL;
328 if (!session_traverse(gather_sessioninfo, (void *) &sesslist)) {
329 DEBUG(3, ("Session traverse failed\n"));
330 SAFE_FREE(sesslist.sessions);
331 *session_list = NULL;
335 *session_list = sesslist.sessions;
336 return sesslist.count;