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comparison src/permissions.c @ 0:08114f7dcc23 0.2.21

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this is masqmail-0.2.21 from oliver kurth
author meillo@marmaro.de
date Fri, 26 Sep 2008 17:05:23 +0200
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children 26e34ae9a3e3
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-1:000000000000 0:08114f7dcc23
1 /* MasqMail
2 Copyright (C) 2000 Oliver Kurth
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #include "masqmail.h"
20 #include <pwd.h>
21 #include <grp.h>
22
23 /* is there really no function in libc for this? */
24 gboolean is_ingroup(uid_t uid, gid_t gid)
25 {
26 struct group *grent = getgrgid(gid);
27
28 if(grent){
29 struct passwd *pwent = getpwuid(uid);
30 if(pwent){
31 char *entry;
32 int i = 0;
33 while((entry = grent->gr_mem[i++])){
34 if(strcmp(pwent->pw_name, entry) == 0)
35 return TRUE;
36 }
37 }
38 }
39 return FALSE;
40 }
41
42 gboolean is_privileged_user(uid_t uid)
43 {
44 return (uid == 0) || (uid == conf.mail_uid) || (is_ingroup(uid, conf.mail_gid));
45 }
46
47 void set_euidgid(gint uid, gint gid, uid_t *old_uid, gid_t *old_gid)
48 {
49 if(old_uid) *old_uid = geteuid();
50 if(old_gid) *old_gid = getegid();
51
52 seteuid(0);
53
54 if(setegid(gid) != 0){
55 logwrite(LOG_ALERT, "could not change gid to %d: %s\n",
56 gid, strerror(errno));
57 exit(EXIT_FAILURE);
58 }
59 if(seteuid(uid) != 0){
60 logwrite(LOG_ALERT, "could not change uid to %d: %s\n",
61 uid, strerror(errno));
62 exit(EXIT_FAILURE);
63 }
64 }
65
66 void set_identity(uid_t old_uid, gchar *task_name)
67 {
68 if(!conf.run_as_user){
69 if(!is_privileged_user(old_uid)){
70 fprintf(stderr,
71 "must be root, %s or in group %s for %s.\n",
72 DEF_MAIL_USER, DEF_MAIL_GROUP, task_name);
73 exit(EXIT_FAILURE);
74 }
75
76 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
77 }
78 }