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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
#define OLD_NTDOMAIN 1
/*
Unix SMB/Netbios implementation.
Version 1.9.
uid/user handling
Copyright (C) Andrew Tridgell 1992-1998
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.
*/
#include "includes.h"
extern int DEBUGLEVEL;
/* what user is current? */
extern struct current_user current_user;
/****************************************************************************
Become the guest user.
****************************************************************************/
BOOL become_guest(void)
{
static struct passwd *pass=NULL;
if (!pass)
pass = Get_Pwnam(lp_guestaccount(-1),True);
if (!pass) return(False);
#ifdef AIX
/* MWW: From AIX FAQ patch to WU-ftpd: call initgroups before
setting IDs */
initgroups(pass->pw_name, (gid_t)pass->pw_gid);
#endif
set_sec_ctx(pass->pw_uid, pass->pw_gid, 0, NULL);
current_user.conn = NULL;
current_user.vuid = UID_FIELD_INVALID;
return True;
}
/*******************************************************************
Check if a username is OK.
********************************************************************/
static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
{
int i;
for (i=0;i<conn->uid_cache.entries;i++)
if (conn->uid_cache.list[i] == vuser->uid) return(True);
if (!user_ok(vuser->user.unix_name,snum)) return(False);
i = conn->uid_cache.entries % UID_CACHE_SIZE;
conn->uid_cache.list[i] = vuser->uid;
if (conn->uid_cache.entries < UID_CACHE_SIZE)
conn->uid_cache.entries++;
return(True);
}
/****************************************************************************
Become the user of a connection number.
****************************************************************************/
BOOL become_user(connection_struct *conn, uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
int snum;
gid_t gid;
uid_t uid;
char group_c;
if (!conn) {
DEBUG(2,("Connection not open\n"));
return(False);
}
/*
* We need a separate check in security=share mode due to vuid
* always being UID_FIELD_INVALID. If we don't do this then
* in share mode security we are *always* changing uid's between
* SMB's - this hurts performance - Badly.
*/
if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
(current_user.uid == conn->uid)) {
DEBUG(4,("Skipping become_user - already user\n"));
return(True);
} else if ((current_user.conn == conn) &&
(vuser != 0) && (current_user.vuid == vuid) &&
(current_user.uid == vuser->uid)) {
DEBUG(4,("Skipping become_user - already user\n"));
return(True);
}
snum = SNUM(conn);
if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
return False;
if (conn->force_user ||
lp_security() == SEC_SHARE ||
!(vuser) || (vuser->guest)) {
uid = conn->uid;
gid = conn->gid;
current_user.groups = conn->groups;
current_user.ngroups = conn->ngroups;
} else {
if (!vuser) {
DEBUG(2,("Invalid vuid used %d\n",vuid));
return(False);
}
uid = vuser->uid;
gid = vuser->gid;
current_user.ngroups = vuser->n_groups;
current_user.groups = vuser->groups;
}
/*
* See if we should force group for this service.
* If so this overrides any group set in the force
* user code.
*/
if((group_c = *lp_force_group(snum))) {
if(group_c == '+') {
/*
* Only force group if the user is a member of
* the service group. Check the group memberships for
* this user (we already have this) to
* see if we should force the group.
*/
int i;
for (i = 0; i < current_user.ngroups; i++) {
if (current_user.groups[i] == conn->gid) {
gid = conn->gid;
break;
}
}
} else {
gid = conn->gid;
}
}
set_sec_ctx(uid, gid, current_user.ngroups, current_user.groups);
current_user.conn = conn;
current_user.vuid = vuid;
DEBUG(5,("become_user uid=(%d,%d) gid=(%d,%d)\n",
(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
return(True);
}
/****************************************************************************
Unbecome the user of a connection number.
****************************************************************************/
BOOL unbecome_user(void )
{
set_root_sec_ctx();
DEBUG(5,("unbecome_user now uid=(%d,%d) gid=(%d,%d)\n",
(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
current_user.conn = NULL;
current_user.vuid = UID_FIELD_INVALID;
return(True);
}
/****************************************************************************
Become the user of an authenticated connected named pipe.
When this is called we are currently running as the connection
user.
****************************************************************************/
BOOL become_authenticated_pipe_user(pipes_struct *p)
{
BOOL res = push_sec_ctx();
if (!res) {
return False;
}
set_sec_ctx(p->pipe_user.uid, p->pipe_user.gid,
p->pipe_user.ngroups, p->pipe_user.groups);
return True;
}
/****************************************************************************
Unbecome the user of an authenticated connected named pipe.
When this is called we are running as the authenticated pipe
user and need to go back to being the connection user.
****************************************************************************/
BOOL unbecome_authenticated_pipe_user(pipes_struct *p)
{
return pop_sec_ctx();
}
/* Temporarily become a root user. Must match with unbecome_root(). */
void become_root(void)
{
push_sec_ctx();
set_root_sec_ctx();
}
/* Unbecome the root user */
void unbecome_root(void)
{
pop_sec_ctx();
}
#undef OLD_NTDOMAIN
|
