s3:smbd/trans2: make use of BVAL() and remove ugly LARGE_SMB_OFF_T ifdef's
[Samba.git] / source3 / lib / system_smbd.c
blob634f88ea9c2c368d3c5241f2f162b2bc70487bd5
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"
30 #ifndef HAVE_GETGROUPLIST
32 #ifdef HAVE_GETGRSET
33 static int getgrouplist_getgrset(const char *user, gid_t gid, gid_t *groups,
34 int *grpcnt)
36 char *grplist;
37 char *grp;
38 gid_t temp_gid;
39 int num_gids = 1;
40 int ret = 0;
41 long l;
43 grplist = getgrset(user);
45 DEBUG(10, ("getgrset returned %s\n", grplist));
47 if (grplist == NULL) {
48 return -1;
51 if (*grpcnt > 0) {
52 groups[0] = gid;
55 while ((grp = strsep(&grplist, ",")) != NULL) {
56 l = strtol(grp, NULL, 10);
57 temp_gid = (gid_t) l;
58 if (temp_gid == gid) {
59 continue;
62 if (num_gids + 1 > *grpcnt) {
63 num_gids++;
64 continue;
66 groups[num_gids++] = temp_gid;
68 free(grplist);
70 if (num_gids > *grpcnt) {
71 ret = -1;
73 *grpcnt = num_gids;
75 DEBUG(10, ("Found %d groups for user %s\n", *grpcnt, user));
77 return ret;
80 #else /* HAVE_GETGRSET */
83 This is a *much* faster way of getting the list of groups for a user
84 without changing the current supplementary group list. The old
85 method used getgrent() which could take 20 minutes on a really big
86 network with hundeds of thousands of groups and users. The new method
87 takes a couple of seconds.
89 NOTE!! this function only works if it is called as root!
92 static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
93 int *grpcnt)
95 gid_t *gids_saved;
96 int ret, ngrp_saved, num_gids;
98 if (non_root_mode()) {
99 *grpcnt = 0;
100 return 0;
103 /* work out how many groups we need to save */
104 ngrp_saved = getgroups(0, NULL);
105 if (ngrp_saved == -1) {
106 /* this shouldn't happen */
107 return -1;
110 gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
111 if (!gids_saved) {
112 errno = ENOMEM;
113 return -1;
116 ngrp_saved = getgroups(ngrp_saved, gids_saved);
117 if (ngrp_saved == -1) {
118 SAFE_FREE(gids_saved);
119 /* very strange! */
120 return -1;
123 if (initgroups(user, gid) == -1) {
124 DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
125 SAFE_FREE(gids_saved);
126 return -1;
129 /* this must be done to cope with systems that put the current egid in the
130 return from getgroups() */
131 save_re_gid();
132 set_effective_gid(gid);
133 setgid(gid);
135 num_gids = getgroups(0, NULL);
136 if (num_gids == -1) {
137 SAFE_FREE(gids_saved);
138 /* very strange! */
139 return -1;
142 if (num_gids + 1 > *grpcnt) {
143 *grpcnt = num_gids + 1;
144 ret = -1;
145 } else {
146 ret = getgroups(*grpcnt - 1, &groups[1]);
147 if (ret < 0) {
148 SAFE_FREE(gids_saved);
149 /* very strange! */
150 return -1;
152 groups[0] = gid;
153 *grpcnt = ret + 1;
156 restore_re_gid();
158 if (sys_setgroups(gid, ngrp_saved, gids_saved) != 0) {
159 /* yikes! */
160 DEBUG(0,("ERROR: getgrouplist: failed to reset group list!\n"));
161 smb_panic("getgrouplist: failed to reset group list!");
164 free(gids_saved);
165 return ret;
167 #endif /* HAVE_GETGRSET */
168 #endif /* HAVE_GETGROUPLIST */
170 static int sys_getgrouplist(const char *user, gid_t gid, gid_t *groups, int *grpcnt)
172 int retval;
173 bool winbind_env;
175 DEBUG(10,("sys_getgrouplist: user [%s]\n", user));
177 /* This is only ever called for Unix users, remote memberships are
178 * always determined by the info3 coming back from auth3 or the
179 * PAC. */
180 winbind_env = winbind_env_set();
181 (void)winbind_off();
183 #ifdef HAVE_GETGROUPLIST
184 retval = getgrouplist(user, gid, groups, grpcnt);
185 #else
186 #ifdef HAVE_GETGRSET
187 retval = getgrouplist_getgrset(user, gid, groups, grpcnt);
188 #else
189 become_root();
190 retval = getgrouplist_internals(user, gid, groups, grpcnt);
191 unbecome_root();
192 #endif /* HAVE_GETGRSET */
193 #endif /* HAVE_GETGROUPLIST */
195 /* allow winbindd lookups, but only if they were not already disabled */
196 if (!winbind_env) {
197 (void)winbind_on();
200 return retval;
203 bool getgroups_unix_user(TALLOC_CTX *mem_ctx, const char *user,
204 gid_t primary_gid,
205 gid_t **ret_groups, uint32_t *p_ngroups)
207 uint32_t ngrp;
208 int max_grp;
209 gid_t *temp_groups;
210 gid_t *groups;
211 int i;
213 max_grp = MIN(128, groups_max());
214 temp_groups = SMB_MALLOC_ARRAY(gid_t, max_grp);
215 if (! temp_groups) {
216 return False;
219 if (sys_getgrouplist(user, primary_gid, temp_groups, &max_grp) == -1) {
220 temp_groups = SMB_REALLOC_ARRAY(temp_groups, gid_t, max_grp);
221 if (!temp_groups) {
222 return False;
225 if (sys_getgrouplist(user, primary_gid,
226 temp_groups, &max_grp) == -1) {
227 DEBUG(0, ("get_user_groups: failed to get the unix "
228 "group list\n"));
229 SAFE_FREE(temp_groups);
230 return False;
234 ngrp = 0;
235 groups = NULL;
237 /* Add in primary group first */
238 if (!add_gid_to_array_unique(mem_ctx, primary_gid, &groups, &ngrp)) {
239 SAFE_FREE(temp_groups);
240 return False;
243 for (i=0; i<max_grp; i++) {
244 if (!add_gid_to_array_unique(mem_ctx, temp_groups[i],
245 &groups, &ngrp)) {
246 SAFE_FREE(temp_groups);
247 return False;
251 *p_ngroups = ngrp;
252 *ret_groups = groups;
253 SAFE_FREE(temp_groups);
254 return True;