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annotate src/permissions.c @ 216:84bf7a6b6ccd

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added misc/list-versions This script helps to check if the versions numbers in the project are the same as the one for the release. This script is motivated by the 0.2.27 release in which masqmail introduces itself as being version 0.2.26.
author meillo@marmaro.de
date Mon, 19 Jul 2010 14:01:13 +0200
parents 3cbcc46c7d49
children 996b53a50f55
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1 /* MasqMail
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2 Copyright (C) 2000 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18
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19 #include <pwd.h>
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20 #include <grp.h>
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21
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22 #include "masqmail.h"
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23
0
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24 /* is there really no function in libc for this? */
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25 gboolean
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26 is_ingroup(uid_t uid, gid_t gid)
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27 {
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28 struct group *grent = getgrgid(gid);
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29 struct passwd *pwent = getpwuid(uid);
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30 char *entry;
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31 int i = 0;
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32
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33 if (!grent) {
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34 return FALSE;
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35 }
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36 if (!pwent) {
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37 return FALSE;
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38 }
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39 /* check primary group */
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40 if (pwent->pw_gid == gid) {
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41 return TRUE;
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42 }
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43 /* check secondary groups */
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44 while ((entry = grent->gr_mem[i++])) {
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45 if (strcmp(pwent->pw_name, entry) == 0)
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46 return TRUE;
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47 }
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48 return FALSE;
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49 }
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50
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51 gboolean
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52 is_privileged_user(uid_t uid)
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53 {
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54 /* uncomment these lines if you need the `uucp' group to be trusted too
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55 struct group* grent = getgrnam("uucp");
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56
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57 if (is_ingroup(uid, grent->gr_gid)) {
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58 return TRUE;
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59 }
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60 */
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61
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62 return (uid == 0) || (uid == conf.mail_uid) || (is_ingroup(uid, conf.mail_gid));
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63 }
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64
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65 void
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66 set_euidgid(gint uid, gint gid, uid_t * old_uid, gid_t * old_gid)
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67 {
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68 if (old_uid)
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69 *old_uid = geteuid();
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70 if (old_gid)
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71 *old_gid = getegid();
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72
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73 seteuid(0);
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74
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75 if (setegid(gid) != 0) {
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76 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", gid, strerror(errno));
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77 exit(EXIT_FAILURE);
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78 }
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79 if (seteuid(uid) != 0) {
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80 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", uid, strerror(errno));
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81 exit(EXIT_FAILURE);
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82 }
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83 }
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84
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85 void
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86 set_identity(uid_t old_uid, gchar * task_name)
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87 {
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88 if (!conf.run_as_user) {
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89 if (!is_privileged_user(old_uid)) {
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90 fprintf(stderr, "must be root, %s or in group %s for %s.\n", DEF_MAIL_USER, DEF_MAIL_GROUP, task_name);
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91 exit(EXIT_FAILURE);
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92 }
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93
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94 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
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95 }
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96 }