126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2008 - 2010, Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* Separated from setup.c. --marekm
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <grp.h>
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#include <errno.h>
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#include "prototypes.h"
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#include "defines.h"
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#include <pwd.h>
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#include "getdef.h"
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/*
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* setup_groups - set the group credentials
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* set the group ID to the value from the password file entry
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* set the supplementary group IDs
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*
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* In case of PAM enabled configurations, this shall be called before
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* pam_setcred.
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*
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* Returns 0 on success, or -1 on failure.
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*/
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int setup_groups (const struct passwd *info)
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{
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/*
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* Set the real group ID to the primary group ID in the password
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* file.
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*/
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if (setgid (info->pw_gid) == -1) {
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int err = errno;
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perror ("setgid");
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SYSLOG ((LOG_ERR, "bad group ID `%d' for user `%s': %s\n",
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info->pw_gid, info->pw_name, strerror (err)));
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closelog ();
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return -1;
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}
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#ifdef HAVE_INITGROUPS
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/*
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* For systems which support multiple concurrent groups, go get
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* the group set from the /etc/group file.
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*/
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if (initgroups (info->pw_name, info->pw_gid) == -1) {
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int err = errno;
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perror ("initgroups");
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SYSLOG ((LOG_ERR, "initgroups failed for user `%s': %s\n",
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info->pw_name, strerror (err)));
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closelog ();
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return -1;
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}
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#endif
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return 0;
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}
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/*
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* change_uid - Set the real UID
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*
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* Returns 0 on success, or -1 on failure.
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*/
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int change_uid (const struct passwd *info)
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{
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/*
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* Set the real UID to the UID value in the password file.
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*/
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if (setuid (info->pw_uid) != 0) {
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int err = errno;
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perror ("setuid");
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SYSLOG ((LOG_ERR, "bad user ID `%d' for user `%s': %s\n",
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(int) info->pw_uid, info->pw_name, strerror (err)));
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closelog ();
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return -1;
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}
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return 0;
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}
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/*
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* setup_uid_gid() performs the following steps -
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*
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* set the group ID to the value from the password file entry
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* set the supplementary group IDs
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* optionally call specified function which may add more groups
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* set the user ID to the value from the password file entry
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*
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* Returns 0 on success, or -1 on failure.
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*/
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#if defined (HAVE_INITGROUPS) && ! (defined USE_PAM)
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int setup_uid_gid (const struct passwd *info, bool is_console)
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#else
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int setup_uid_gid (const struct passwd *info)
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#endif
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{
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if (setup_groups (info) < 0) {
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return -1;
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}
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#if defined (HAVE_INITGROUPS) && ! defined (USE_PAM)
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if (is_console) {
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const char *cp = getdef_str ("CONSOLE_GROUPS");
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if ((NULL != cp) && (add_groups (cp) != 0)) {
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perror ("Warning: add_groups");
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}
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}
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#endif /* HAVE_INITGROUPS && !USE_PAM*/
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if (change_uid (info) < 0) {
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return -1;
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}
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return 0;
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}
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