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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
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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 return (uid == 0) || (uid == conf.mail_uid) || (is_ingroup(uid, conf.mail_gid));
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55 }
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56
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57 void
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58 set_euidgid(gint uid, gint gid, uid_t * old_uid, gid_t * old_gid)
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59 {
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60 if (old_uid)
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61 *old_uid = geteuid();
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62 if (old_gid)
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63 *old_gid = getegid();
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64
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65 seteuid(0);
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66
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67 if (setegid(gid) != 0) {
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68 logwrite(LOG_ALERT, "could not change gid to %d: %s\n", gid, strerror(errno));
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69 exit(EXIT_FAILURE);
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70 }
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71 if (seteuid(uid) != 0) {
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72 logwrite(LOG_ALERT, "could not change uid to %d: %s\n", uid, strerror(errno));
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73 exit(EXIT_FAILURE);
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74 }
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75 }
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76
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77 void
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78 set_identity(uid_t old_uid, gchar * task_name)
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79 {
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80 if (!conf.run_as_user) {
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81 if (!is_privileged_user(old_uid)) {
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82 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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83 exit(EXIT_FAILURE);
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84 }
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85
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86 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
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87 }
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88 }
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