| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | system call wrapper interface.
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| 4 | Copyright (C) Andrew Tridgell 2002
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| 5 | Copyright (C) Andrew Barteltt 2002
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 3 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 |
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| 21 | /*
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| 22 | This file may assume linkage with smbd - for things like become_root()
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| 23 | etc.
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| 24 | */
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| 25 |
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| 26 | #include "includes.h"
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| 27 |
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| 28 | #ifndef HAVE_GETGROUPLIST
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| 29 |
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| 30 | /*
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| 31 | This is a *much* faster way of getting the list of groups for a user
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| 32 | without changing the current supplementary group list. The old
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| 33 | method used getgrent() which could take 20 minutes on a really big
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| 34 | network with hundeds of thousands of groups and users. The new method
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| 35 | takes a couple of seconds.
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| 36 |
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| 37 | NOTE!! this function only works if it is called as root!
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| 38 | */
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| 39 |
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| 40 | static int getgrouplist_internals(const char *user, gid_t gid, gid_t *groups,
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| 41 | int *grpcnt)
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| 42 | {
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| 43 | gid_t *gids_saved;
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| 44 | int ret, ngrp_saved, num_gids;
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| 45 |
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| 46 | if (non_root_mode()) {
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| 47 | *grpcnt = 0;
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| 48 | return 0;
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| 49 | }
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| 50 |
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| 51 | /* work out how many groups we need to save */
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| 52 | ngrp_saved = getgroups(0, NULL);
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| 53 | if (ngrp_saved == -1) {
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| 54 | /* this shouldn't happen */
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| 55 | return -1;
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| 56 | }
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| 57 |
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| 58 | gids_saved = SMB_MALLOC_ARRAY(gid_t, ngrp_saved+1);
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| 59 | if (!gids_saved) {
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| 60 | errno = ENOMEM;
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| 61 | return -1;
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| 62 | }
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| 63 |
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| 64 | ngrp_saved = getgroups(ngrp_saved, gids_saved);
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| 65 | if (ngrp_saved == -1) {
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| 66 | SAFE_FREE(gids_saved);
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| 67 | /* very strange! */
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| 68 | return -1;
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| 69 | }
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| 70 |
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| 71 | if (initgroups(user, gid) != 0) {
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| 72 | DEBUG(0, ("getgrouplist_internals: initgroups() failed!\n"));
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| 73 | SAFE_FREE(gids_saved);
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| 74 | return -1;
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| 75 | }
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| 76 |
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| 77 | /* this must be done to cope with systems that put the current egid in the
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| 78 | return from getgroups() */
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| 79 | save_re_gid();
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| 80 | set_effective_gid(gid);
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| 81 | setgid(gid);
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