masqmail

view src/permissions.c @ 246:4cff8638dd9b

find changesets by author, revision, files, or words in the commit message
SMTP client: tries EHLO now always first Changed the behavior of the SMTP client. Now always an EHLO greeting is sent, no matter what kind of greeting text the server had sent. If the EHLO failed, an HELO greeting is tried as fall back. This is the behavior RFC 2821 requires (section 3.2). This change will fix setups that were not possible to sent to a server because that requires AUTH but hadn't said ``ESMTP'' in its greeting message. See also: Debian bug #349211 Thanks to Steffen (inne)
author markus schnalke <meillo@marmaro.de>
date Thu, 28 Oct 2010 16:40:02 -0300
parents 3cbcc46c7d49
children fc1c6425c024
line source
1 /* MasqMail
2 Copyright (C) 2000 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #include <pwd.h>
21 #include <grp.h>
22
23 #include "masqmail.h"
24
25 /* is there really no function in libc for this? */
26 gboolean
27 is_ingroup(uid_t uid, gid_t gid)
28 {
29 struct group *grent = getgrgid(gid);
30 struct passwd *pwent = getpwuid(uid);
31 char *entry;
32 int i = 0;
33
34 if (!grent) {
35 return FALSE;
36 }
37 if (!pwent) {
38 return FALSE;
39 }
40 /* check primary group */
41 if (pwent->pw_gid == gid) {
42 return TRUE;
43 }
44 /* check secondary groups */
45 while ((entry = grent->gr_mem[i++])) {
46 if (strcmp(pwent->pw_name, entry) == 0)
47 return TRUE;
48 }
49 return FALSE;
50 }
51
52 gboolean
53 is_privileged_user(uid_t uid)
54 {
55 /* uncomment these lines if you need the `uucp' group to be trusted too
56 struct group* grent = getgrnam("uucp");
57
58 if (is_ingroup(uid, grent->gr_gid)) {
59 return TRUE;
60 }
61 */
62
63 return (uid == 0) || (uid == conf.mail_uid) || (is_ingroup(uid, conf.mail_gid));
64 }
65
66 void
67 set_euidgid(gint uid, gint gid, uid_t * old_uid, gid_t * old_gid)
68 {
69 if (old_uid)
70 *old_uid = geteuid();
71 if (old_gid)
72 *old_gid = getegid();
73
74 seteuid(0);
75
76 if (setegid(gid) != 0) {
77 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", gid, strerror(errno));
78 exit(EXIT_FAILURE);
79 }
80 if (seteuid(uid) != 0) {
81 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", uid, strerror(errno));
82 exit(EXIT_FAILURE);
83 }
84 }
85
86 void
87 set_identity(uid_t old_uid, gchar * task_name)
88 {
89 if (!conf.run_as_user) {
90 if (!is_privileged_user(old_uid)) {
91 fprintf(stderr, "must be root, %s or in group %s for %s.\n", DEF_MAIL_USER, DEF_MAIL_GROUP, task_name);
92 exit(EXIT_FAILURE);
93 }
94
95 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
96 }
97 }