summaryrefslogtreecommitdiff
path: root/source3/smbd/session.c
blob: 01a8194d2f303e6ea75e40678c94c7ba2632b67e (plain)
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
163
164
165
166
167
/* 
   Unix SMB/CIFS implementation.
   session handling for utmp and PAM

   Copyright (C) tridge@samba.org       2001
   Copyright (C) abartlet@samba.org     2001
   Copyright (C) Gerald (Jerry) Carter  2006   
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

/* 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"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "dbwrap/dbwrap.h"
#include "session.h"
#include "auth.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/security/security.h"
#include "messages.h"

/********************************************************************
 called when a session is created
********************************************************************/

bool session_claim(struct smbXsrv_session *session)
{
	struct auth_session_info *session_info =
		session->global->auth_session_info;
	const char *username;
	const char *hostname;
	unsigned int id_num;
	fstring id_str;

	/* don't register sessions for the guest user - its just too
	   expensive to go through pam session code for browsing etc */
	if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
		return true;
	}

	id_num = session->global->session_global_id;

	snprintf(id_str, sizeof(id_str), "smb/%u", id_num);

	/* Make clear that we require the optional unix_token in the source3 code */
	SMB_ASSERT(session_info->unix_token);

	username = session_info->unix_info->unix_name;
	hostname = session->global->channels[0].remote_name;

	if (!smb_pam_claim_session(username, id_str, hostname)) {
		DEBUG(1,("pam_session rejected the session for %s [%s]\n",
				username, id_str));
		return false;
	}

	if (lp_utmp()) {
		sys_utmp_claim(username, hostname, id_str, id_num);
	}

	return true;
}

/********************************************************************
 called when a session is destroyed
********************************************************************/

void session_yield(struct smbXsrv_session *session)
{
	struct auth_session_info *session_info =
		session->global->auth_session_info;
	const char *username;
	const char *hostname;
	unsigned int id_num;
	fstring id_str = "";

	id_num = session->global->session_global_id;

	snprintf(id_str, sizeof(id_str), "smb/%u", id_num);

	/* Make clear that we require the optional unix_token in the source3 code */
	SMB_ASSERT(session_info->unix_token);

	username = session_info->unix_info->unix_name;
	hostname = session->global->channels[0].remote_name;

	if (lp_utmp()) {
		sys_utmp_yield(username, hostname, id_str, id_num);
	}

	smb_pam_close_session(username, id_str, hostname);
}

/********************************************************************
********************************************************************/

struct session_list {
	TALLOC_CTX *mem_ctx;
	int count;
	struct sessionid *sessions;
};

static int gather_sessioninfo(const char *key, struct sessionid *session,
			      void *private_data)
{
	struct session_list *sesslist = (struct session_list *)private_data;

	sesslist->sessions = talloc_realloc(
		sesslist->mem_ctx, sesslist->sessions, struct sessionid,
		sesslist->count+1);

	if (!sesslist->sessions) {
		sesslist->count = 0;
		return -1;
	}

	memcpy(&sesslist->sessions[sesslist->count], session,
	       sizeof(struct sessionid));

	sesslist->count++;

	DEBUG(7, ("gather_sessioninfo session from %s@%s\n",
		  session->username, session->remote_machine));

	return 0;
}

/********************************************************************
********************************************************************/

int list_sessions(TALLOC_CTX *mem_ctx, struct sessionid **session_list)
{
	struct session_list sesslist;
	NTSTATUS status;

	sesslist.mem_ctx = mem_ctx;
	sesslist.count = 0;
	sesslist.sessions = NULL;

	status = sessionid_traverse_read(gather_sessioninfo, (void *) &sesslist);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(3, ("Session traverse failed\n"));
		SAFE_FREE(sesslist.sessions);
		*session_list = NULL;
		return 0;
	}

	*session_list = sesslist.sessions;
	return sesslist.count;
}