docs: use the stdarg.option entity in the popt.common.samba entity
[Samba/gebeck_regimport.git] / source3 / lib / system_smbd.c
blob10d7f38d528b2f6989a775200644045cd4e1ad15
1 /*
2 Unix SMB/CIFS implementation.
3 system call wrapper interface.
4 Copyright (C) Andrew Tridgell 2002
5 Copyright (C) Andrew Barteltt 2002
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 /*
22 This file may assume linkage with smbd - for things like become_root()
23 etc.
26 #include "includes.h"
27 #include "system/passwd.h"
28 #include "nsswitch/winbind_client.h"
29 #include "../lib/util/setid.h"
31 #ifndef HAVE_GETGROUPLIST
33 #ifdef HAVE_GETGRSET
34 static int getgrouplist_getgrset(const char *user, gid_t gid, gid_t *groups,
35 int *grpcnt)
37 char *grplist;
38 char *grp;
39 gid_t temp_gid;
40 int num_gids = 1;
41 int ret = 0;
42 long l;
44 grplist = getgrset(user);
46 DEBUG(10, ("getgrset returned %s\n", grplist));
48 if (grplist == NULL) {
49 return -1;
52 if (*grpcnt > 0) {
53 groups[0] = gid;
56 while ((grp = strsep(&grplist, ",")) != NULL) {
57 l = strtol(grp, NULL, 10);
58 temp_gid = (gid_t) l;
59 if (temp_gid == gid) {
60 continue;
63 if (num_gids + 1 > *grpcnt) {
64 num_gids++;
65 continue;
67 groups[num_gids++] = temp_gid;
69 free(grplist);
71 if (num_gids > *grpcnt) {
72 ret = -1;
74 *grpcnt = num_gids;
76 DEBUG(10, ("Found %d groups for user %s\n", *grpcnt, user));
78 return ret;
81 #else /* HAVE_GETGRSET */
84 This is a *much* faster way of getting the list of groups for a user
85 without changing the current supplementary group list. The old
86 method used getgrent() which could take 20 minutes on a really big
87 network with hundeds of thousands of groups and users. The new method
88 takes a couple of seconds.
90 NOTE!! this function only works if it is called as root!
93 static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
94 int *grpcnt)
96 gid_t *gids_saved;
97 int ret, ngrp_saved, num_gids;
99 if (non_root_mode()) {
100 *grpcnt = 0;
101 return 0;
104 /* work out how many groups we need to save */
105 ngrp_saved = getgroups(0, NULL);
106 if (ngrp_saved == -1) {
107 /* this shouldn't happen */
108 return -1;
111 gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
112 if (!gids_saved) {
113 errno = ENOMEM;
114 return -1;
117 ngrp_saved = getgroups(ngrp_saved, gids_saved);
118 if (ngrp_saved == -1) {
119 SAFE_FREE(gids_saved);
120 /* very strange! */
121 return -1;
124 if (initgroups(user, gid) == -1) {
125 DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
126 SAFE_FREE(gids_saved);
127 return -1;
130 /* this must be done to cope with systems that put the current egid in the
131 return from getgroups() */
132 save_re_gid();
133 set_effective_gid(gid);
134 samba_setgid(gid);
136 num_gids = getgroups(0, NULL);
137 if (num_gids == -1) {
138 SAFE_FREE(gids_saved);
139 /* very strange! */
140 return -1;
143 if (num_gids + 1 > *grpcnt) {
144 *grpcnt = num_gids + 1;
145 ret = -1;
146 } else {
147 ret = getgroups(*grpcnt - 1, &groups[1]);
148 if (ret < 0) {
149 SAFE_FREE(gids_saved);
150 /* very strange! */
151 return -1;
153 groups[0] = gid;
154 *grpcnt = ret + 1;
157 restore_re_gid();
159 if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
160 /* yikes! */
161 DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
162 smb_panic("getgrouplist: failed to reset group list!");
165 free(gids_saved);
166 return ret;
168 #endif /* HAVE_GETGRSET */
169 #endif /* HAVE_GETGROUPLIST */
171 static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
173 int retval;
174 bool winbind_env;
176 DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
178 /* This is only ever called for Unix users, remote memberships are
179 * always determined by the info3 coming back from auth3 or the
180 * PAC. */
181 winbind_env = winbind_env_set();
182 (void)winbind_off();
184 #ifdef HAVE_GETGROUPLIST
185 retval = getgrouplist(user, gid, groups, grpcnt);
186 #else
187 #ifdef HAVE_GETGRSET
188 retval = getgrouplist_getgrset(user, gid, groups, grpcnt);
189 #else
190 become_root();
191 retval = getgrouplist_internals(user, gid, groups, grpcnt);
192 unbecome_root();
193 #endif /* HAVE_GETGRSET */
194 #endif /* HAVE_GETGROUPLIST */
196 /* allow winbindd lookups, but only if they were not already disabled */
197 if (!winbind_env) {
198 (void)winbind_on();
201 return retval;
204 bool getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
205 gid_t primary_gid,
206 gid_t **ret_groups, uint32_t *p_ngroups)
208 uint32_t ngrp;
209 int max_grp;
210 gid_t *temp_groups;
211 gid_t *groups;
212 int i;
214 max_grp = MIN(128, groups_max());
215 temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
216 if (! temp_groups) {
217 return False;
220 if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
221 temp_groups = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
222 if (!temp_groups) {
223 return False;
226 if (sys_getgrouplist(user, primary_gid,
227 temp_groups, &max_grp) == -1) {
228 DEBUG(0, ("get_user_groups: failed to get the unix "
229 "group list\n"));
230 SAFE_FREE(temp_groups);
231 return False;
235 ngrp = 0;
236 groups = NULL;
238 /* Add in primary group first */
239 if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
240 SAFE_FREE(temp_groups);
241 return False;
244 for (i=0; i<max_grp; i++) {
245 if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
246 &groups, &ngrp)) {
247 SAFE_FREE(temp_groups);
248 return False;
252 *p_ngroups = ngrp;
253 *ret_groups = groups;
254 SAFE_FREE(temp_groups);
255 return True;