1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
Unix SMB/Netbios implementation.
Version 2.0
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"
extern fstring remote_machine;
static TDB_CONTEXT *tdb;
/* called when a session is created */
BOOL session_claim(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
int i;
TDB_DATA data;
struct sessionid sessionid;
uint32 pid = (uint32)sys_getpid();
TDB_DATA key;
fstring keystr;
char * hostname;
vuser->session_id = 0;
/* don't register sessions for the guest user - its just too
expensive to go through pam session code for browsing etc */
if (strequal(vuser->user.unix_name,lp_guestaccount(-1))) {
return True;
}
if (!tdb) {
tdb = tdb_open_log(lock_path("sessionid.tdb"), 0, TDB_CLEAR_IF_FIRST|USE_TDB_MMAP_FLAG,
O_RDWR | O_CREAT, 0644);
if (!tdb) {
DEBUG(1,("session_claim: failed to open sessionid tdb\n"));
return False;
}
}
ZERO_STRUCT(sessionid);
data.dptr = NULL;
data.dsize = 0;
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;
}
hostname = client_name();
if (strequal(hostname,"UNKNOWN"))
hostname = client_addr();
fstrcpy(sessionid.username, vuser->user.unix_name);
fstrcpy(sessionid.hostname, hostname);
slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1, SESSION_TEMPLATE, i);
sessionid.id_num = i;
sessionid.pid = pid;
sessionid.uid = vuser->uid;
sessionid.gid = vuser->gid;
fstrcpy(sessionid.remote_machine, remote_machine);
fstrcpy(sessionid.ip_addr, client_addr());
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));
tdb_delete(tdb, key);
return False;
}
data.dptr = (char *)&sessionid;
data.dsize = sizeof(sessionid);
if (tdb_store(tdb, key, data, TDB_MODIFY) != 0) {
DEBUG(1,("session_claim: unable to create session id record\n"));
return False;
}
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_claim(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
vuser->session_id = i;
return True;
}
/* called when a session is destroyed */
void session_yield(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
TDB_DATA dbuf;
struct sessionid sessionid;
TDB_DATA key;
fstring keystr;
if (!tdb) return;
if (vuser->session_id == 0) {
return;
}
slprintf(keystr, sizeof(keystr)-1, "ID/%d", vuser->session_id);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
dbuf = tdb_fetch(tdb, key);
if (dbuf.dsize != sizeof(sessionid))
return;
memcpy(&sessionid, dbuf.dptr, sizeof(sessionid));
safe_free(dbuf.dptr);
dbuf.dptr = NULL;
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_yield(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
smb_pam_close_session(sessionid.username, sessionid.id_str, sessionid.hostname);
tdb_delete(tdb, key);
}
|
