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
|
/*
Unix SMB/CIFS implementation.
system call wrapper interface.
Copyright (C) Andrew Tridgell 2002
Copyright (C) Andrew Barteltt 2002
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.
*/
/*
This file may assume linkage with smbd - for things like become_root()
etc.
*/
#include "includes.h"
#ifndef HAVE_GETGROUPLIST
/*
This is a *much* faster way of getting the list of groups for a user
without changing the current supplementary group list. The old
method used getgrent() which could take 20 minutes on a really big
network with hundeds of thousands of groups and users. The new method
takes a couple of seconds.
NOTE!! this function only works if it is called as root!
*/
static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
int *grpcnt)
{
gid_t *gids_saved;
int ret, ngrp_saved, num_gids;
if (non_root_mode()) {
*grpcnt = 0;
return 0;
}
/* work out how many groups we need to save */
ngrp_saved = getgroups(0, NULL);
if (ngrp_saved == -1) {
/* this shouldn't happen */
return -1;
}
gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
if (!gids_saved) {
errno = ENOMEM;
return -1;
}
ngrp_saved = getgroups(ngrp_saved, gids_saved);
if (ngrp_saved == -1) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
if (initgroups(user, gid) != 0) {
DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
SAFE_FREE(gids_saved);
return -1;
}
/* this must be done to cope with systems that put the current egid in the
return from getgroups() */
save_re_gid();
set_effective_gid(gid);
setgid(gid);
num_gids = getgroups(0, NULL);
if (num_gids == -1) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
if (num_gids + 1 > *grpcnt) {
*grpcnt = num_gids + 1;
ret = -1;
} else {
ret = getgroups(*grpcnt - 1, &groups[1]);
if (ret < 0) {
SAFE_FREE(gids_saved);
/* very strange! */
return -1;
}
groups[0] = gid;
*grpcnt = ret + 1;
}
restore_re_gid();
if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
/* yikes! */
DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
smb_panic("getgrouplist: failed to reset group list!\n");
free(gids_saved);
return -1;
}
free(gids_saved);
return ret;
}
#endif
static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
{
int retval;
BOOL winbind_env;
DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
/* This is only ever called for Unix users, remote memberships are
* always determined by the info3 coming back from auth3 or the
* PAC. */
winbind_env = winbind_env_set();
winbind_off();
#ifdef HAVE_GETGROUPLIST
retval = getgrouplist(user, gid, groups, grpcnt);
#else
become_root();
retval = getgrouplist_internals(user, gid, groups, grpcnt);
unbecome_root();
#endif
/* allow winbindd lookups, but only if they were not already disabled */
if (!winbind_env) {
winbind_on();
}
return retval;
}
BOOL getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
gid_t primary_gid,
gid_t **ret_groups, size_t *p_ngroups)
{
size_t ngrp;
int max_grp;
gid_t *temp_groups;
gid_t *groups;
int i;
max_grp = groups_max();
temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
if (! temp_groups) {
return False;
}
if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
temp_groups = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
if (!temp_groups) {
return False;
}
if (sys_getgrouplist(user, primary_gid,
temp_groups, &max_grp) == -1) {
DEBUG(0, ("get_user_groups: failed to get the unix "
"group list\n"));
SAFE_FREE(temp_groups);
return False;
}
}
ngrp = 0;
groups = NULL;
/* Add in primary group first */
if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
SAFE_FREE(temp_groups);
return False;
}
for (i=0; i<max_grp; i++) {
if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
&groups, &ngrp)) {
SAFE_FREE(temp_groups);
return False;
}
}
*p_ngroups = ngrp;
*ret_groups = groups;
SAFE_FREE(temp_groups);
return True;
}
|
