source: branches/samba-3.2.x/source/smbd/session.c@ 198

Last change on this file since 198 was 133, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.0pre3
File size: 8.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 session handling for utmp and PAM
4
5 Copyright (C) tridge@samba.org 2001
6 Copyright (C) abartlet@samba.org 2001
7 Copyright (C) Gerald (Jerry) Carter 2006
8
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.
13
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.
18
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/>.
21*/
22
23/* a "session" is claimed when we do a SessionSetupX operation
24 and is yielded when the corresponding vuid is destroyed.
25
26 sessions are used to populate utmp and PAM session structures
27*/
28
29#include "includes.h"
30
31/********************************************************************
32********************************************************************/
33
34static struct db_context *session_db_ctx(void)
35{
36 static struct db_context *ctx;
37
38 if (ctx)
39 return ctx;
40
41 ctx = db_open(NULL, lock_path("sessionid.tdb"), 0,
42 TDB_CLEAR_IF_FIRST|TDB_DEFAULT,
43 O_RDWR | O_CREAT, 0644);
44 return ctx;
45}
46
47bool session_init(void)
48{
49 if (session_db_ctx() == NULL) {
50 DEBUG(1,("session_init: failed to open sessionid tdb\n"));
51 return False;
52 }
53
54 return True;
55}
56
57/********************************************************************
58 called when a session is created
59********************************************************************/
60
61bool session_claim(user_struct *vuser)
62{
63 TDB_DATA key, data;
64 int i = 0;
65 struct sessionid sessionid;
66 struct server_id pid = procid_self();
67 fstring keystr;
68 const char * hostname;
69 struct db_context *ctx;
70 struct db_record *rec;
71 NTSTATUS status;
72 char addr[INET6_ADDRSTRLEN];
73
74 vuser->session_keystr = NULL;
75
76 /* don't register sessions for the guest user - its just too
77 expensive to go through pam session code for browsing etc */
78 if (vuser->guest) {
79 return True;
80 }
81
82 if (!(ctx = session_db_ctx())) {
83 return False;
84 }
85
86 ZERO_STRUCT(sessionid);
87
88 data.dptr = NULL;
89 data.dsize = 0;
90
91 if (lp_utmp()) {
92
93 for (i=1;i<MAX_SESSION_ID;i++) {
94
95 /*
96 * This is very inefficient and needs fixing -- vl
97 */
98
99 struct server_id sess_pid;
100
101 snprintf(keystr, sizeof(keystr), "ID/%d", i);
102 key = string_term_tdb_data(keystr);
103
104 rec = ctx->fetch_locked(ctx, NULL, key);
105
106 if (rec == NULL) {
107 DEBUG(1, ("Could not lock \"%s\"\n", keystr));
108 return False;
109 }
110
111 if (rec->value.dsize != sizeof(sessionid)) {
112 DEBUG(1, ("Re-using invalid record\n"));
113 break;
114 }
115
116 sess_pid = ((struct sessionid *)rec->value.dptr)->pid;
117
118 if (!process_exists(sess_pid)) {
119 DEBUG(5, ("%s has died -- re-using session\n",
120 procid_str_static(&sess_pid)));
121 break;
122 }
123
124 TALLOC_FREE(rec);
125 }
126
127 if (i == MAX_SESSION_ID) {
128 SMB_ASSERT(rec == NULL);
129 DEBUG(1,("session_claim: out of session IDs "
130 "(max is %d)\n", MAX_SESSION_ID));
131 return False;
132 }
133
134 snprintf(sessionid.id_str, sizeof(sessionid.id_str),
135 SESSION_UTMP_TEMPLATE, i);
136 } else
137 {
138 snprintf(keystr, sizeof(keystr), "ID/%s/%u",
139 procid_str_static(&pid), vuser->vuid);
140 key = string_term_tdb_data(keystr);
141
142 rec = ctx->fetch_locked(ctx, NULL, key);
143
144 if (rec == NULL) {
145 DEBUG(1, ("Could not lock \"%s\"\n", keystr));
146 return False;
147 }
148
149 snprintf(sessionid.id_str, sizeof(sessionid.id_str),
150 SESSION_TEMPLATE, (long unsigned int)sys_getpid(),
151 vuser->vuid);
152 }
153
154 SMB_ASSERT(rec != NULL);
155
156 /* If 'hostname lookup' == yes, then do the DNS lookup. This is
157 needed because utmp and PAM both expect DNS names
158
159 client_name() handles this case internally.
160 */
161
162 hostname = client_name(get_client_fd());
163 if (strcmp(hostname, "UNKNOWN") == 0) {
164 hostname = client_addr(get_client_fd(),addr,sizeof(addr));
165 }
166
167 fstrcpy(sessionid.username, vuser->user.unix_name);
168 fstrcpy(sessionid.hostname, hostname);
169 sessionid.id_num = i; /* Only valid for utmp sessions */
170 sessionid.pid = pid;
171 sessionid.uid = vuser->uid;
172 sessionid.gid = vuser->gid;
173 fstrcpy(sessionid.remote_machine, get_remote_machine_name());
174 fstrcpy(sessionid.ip_addr_str,
175 client_addr(get_client_fd(),addr,sizeof(addr)));
176 sessionid.connect_start = time(NULL);
177
178 if (!smb_pam_claim_session(sessionid.username, sessionid.id_str,
179 sessionid.hostname)) {
180 DEBUG(1,("pam_session rejected the session for %s [%s]\n",
181 sessionid.username, sessionid.id_str));
182
183 TALLOC_FREE(rec);
184 return False;
185 }
186
187 data.dptr = (uint8 *)&sessionid;
188 data.dsize = sizeof(sessionid);
189
190 status = rec->store(rec, data, TDB_REPLACE);
191
192 TALLOC_FREE(rec);
193
194 if (!NT_STATUS_IS_OK(status)) {
195 DEBUG(1,("session_claim: unable to create session id "
196 "record: %s\n", nt_errstr(status)));
197 return False;
198 }
199
200 if (lp_utmp()) {
201 sys_utmp_claim(sessionid.username, sessionid.hostname,
202 sessionid.ip_addr_str,
203 sessionid.id_str, sessionid.id_num);
204 }
205
206 vuser->session_keystr = talloc_strdup(vuser, keystr);
207 if (!vuser->session_keystr) {
208 DEBUG(0, ("session_claim: talloc_strdup() failed for session_keystr\n"));
209 return False;
210 }
211 return True;
212}
213
214/********************************************************************
215 called when a session is destroyed
216********************************************************************/
217
218void session_yield(user_struct *vuser)
219{
220 TDB_DATA key;
221 struct sessionid sessionid;
222 struct db_context *ctx;
223 struct db_record *rec;
224
225 if (!(ctx = session_db_ctx())) return;
226
227 if (!vuser->session_keystr) {
228 return;
229 }
230
231 key = string_term_tdb_data(vuser->session_keystr);
232
233 if (!(rec = ctx->fetch_locked(ctx, NULL, key))) {
234 return;
235 }
236
237 if (rec->value.dsize != sizeof(sessionid))
238 return;
239
240 memcpy(&sessionid, rec->value.dptr, sizeof(sessionid));
241
242 if (lp_utmp()) {
243 sys_utmp_yield(sessionid.username, sessionid.hostname,
244 sessionid.ip_addr_str,
245 sessionid.id_str, sessionid.id_num);
246 }
247
248 smb_pam_close_session(sessionid.username, sessionid.id_str,
249 sessionid.hostname);
250
251 rec->delete_rec(rec);
252
253 TALLOC_FREE(rec);
254}
255
256/********************************************************************
257********************************************************************/
258
259static bool session_traverse(int (*fn)(struct db_record *db,
260 void *private_data),
261 void *private_data)
262{
263 struct db_context *ctx;
264
265 if (!(ctx = session_db_ctx())) {
266 DEBUG(3, ("No tdb opened\n"));
267 return False;
268 }
269
270 ctx->traverse_read(ctx, fn, private_data);
271 return True;
272}
273
274/********************************************************************
275********************************************************************/
276
277struct session_list {
278 TALLOC_CTX *mem_ctx;
279 int count;
280 struct sessionid *sessions;
281};
282
283static int gather_sessioninfo(struct db_record *rec, void *state)
284{
285 struct session_list *sesslist = (struct session_list *) state;
286 const struct sessionid *current =
287 (const struct sessionid *) rec->value.dptr;
288
289 sesslist->sessions = TALLOC_REALLOC_ARRAY(
290 sesslist->mem_ctx, sesslist->sessions, struct sessionid,
291 sesslist->count+1);
292
293 if (!sesslist->sessions) {
294 sesslist->count = 0;
295 return -1;
296 }
297
298 memcpy(&sesslist->sessions[sesslist->count], current,
299 sizeof(struct sessionid));
300
301 sesslist->count++;
302
303 DEBUG(7,("gather_sessioninfo session from %s@%s\n",
304 current->username, current->remote_machine));
305
306 return 0;
307}
308
309/********************************************************************
310********************************************************************/
311
312int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
313{
314 struct session_list sesslist;
315
316 sesslist.mem_ctx = mem_ctx;
317 sesslist.count = 0;
318 sesslist.sessions = NULL;
319
320 if (!session_traverse(gather_sessioninfo, (void *) &sesslist)) {
321 DEBUG(3, ("Session traverse failed\n"));
322 SAFE_FREE(sesslist.sessions);
323 *session_list = NULL;
324 return 0;
325 }
326
327 *session_list = sesslist.sessions;
328 return sesslist.count;
329}
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