masqmail-0.2

view src/permissions.c @ 75:257a9e6d1a8e

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fixed correct processing of mails with data lines longer 4096 chars Mail messages with lines longer than 4096 chars were already read correctly, i.e. the spool files were correct. This commit fixes the reading of spool files with long lines. The old behavior was that the message body was truncated right before the first line longer 4096 chars. The number comes from MAX_DATALINE.
author meillo@marmaro.de
date Wed, 16 Jun 2010 19:06:34 +0200
parents 26e34ae9a3e3
children ffeff2c33799
line source
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 <pwd.h>
20 #include <grp.h>
21
22 #include "masqmail.h"
23
24 /* is there really no function in libc for this? */
25 gboolean
26 is_ingroup(uid_t uid, gid_t gid)
27 {
28 struct group *grent = getgrgid(gid);
29
30 if (grent) {
31 struct passwd *pwent = getpwuid(uid);
32 if (pwent) {
33 char *entry;
34 int i = 0;
35 while ((entry = grent->gr_mem[i++])) {
36 if (strcmp(pwent->pw_name, entry) == 0)
37 return TRUE;
38 }
39 }
40 }
41 return FALSE;
42 }
43
44 gboolean
45 is_privileged_user(uid_t uid)
46 {
47 return (uid == 0) || (uid == conf.mail_uid) || (is_ingroup(uid, conf.mail_gid));
48 }
49
50 void
51 set_euidgid(gint uid, gint gid, uid_t * old_uid, gid_t * old_gid)
52 {
53 if (old_uid)
54 *old_uid = geteuid();
55 if (old_gid)
56 *old_gid = getegid();
57
58 seteuid(0);
59
60 if (setegid(gid) != 0) {
61 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", gid, strerror(errno));
62 exit(EXIT_FAILURE);
63 }
64 if (seteuid(uid) != 0) {
65 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", uid, strerror(errno));
66 exit(EXIT_FAILURE);
67 }
68 }
69
70 void
71 set_identity(uid_t old_uid, gchar * task_name)
72 {
73 if (!conf.run_as_user) {
74 if (!is_privileged_user(old_uid)) {
75 fprintf(stderr, "must be root, %s or in group %s for %s.\n", DEF_MAIL_USER, DEF_MAIL_GROUP, task_name);
76 exit(EXIT_FAILURE);
77 }
78
79 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
80 }
81 }