sulogin: initial import from sysvinit
Import the source and manpage of sulogin. Only the selinux #ifdef is changed to match our autotool setup. Signed-off-by: Dave Reisner <dreisner@archlinux.org>
This commit is contained in:
parent
208848ef27
commit
7d8a8d2cd9
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@ -14,6 +14,7 @@ endif
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if BUILD_LOGIN_UTILS
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if BUILD_LOGIN_UTILS
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bin_PROGRAMS += login
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bin_PROGRAMS += login
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sbin_PROGRAMS += sulogin
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usrbin_exec_PROGRAMS += \
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usrbin_exec_PROGRAMS += \
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chfn \
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chfn \
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chsh \
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chsh \
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@ -26,7 +27,8 @@ dist_man_MANS += \
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login.1 \
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login.1 \
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newgrp.1 \
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newgrp.1 \
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vigr.8 \
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vigr.8 \
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vipw.8
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vipw.8 \
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sulogin.8
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# login, chfn and chsh libs
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# login, chfn and chsh libs
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login_ldadd_common =
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login_ldadd_common =
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@ -57,6 +59,7 @@ chsh_LDADD = $(login_ldadd_common)
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login_LDADD = $(login_ldadd_common)
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login_LDADD = $(login_ldadd_common)
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newgrp_LDADD =
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newgrp_LDADD =
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vipw_LDADD =
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vipw_LDADD =
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sulogin_LDADD =
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chfn_CFLAGS = $(SUID_CFLAGS) $(AM_CFLAGS)
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chfn_CFLAGS = $(SUID_CFLAGS) $(AM_CFLAGS)
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chsh_CFLAGS = $(SUID_CFLAGS) $(AM_CFLAGS)
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chsh_CFLAGS = $(SUID_CFLAGS) $(AM_CFLAGS)
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@ -70,6 +73,7 @@ login_ldadd_common += -lpam -lpam_misc
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if HAVE_LIBCRYPT
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if HAVE_LIBCRYPT
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newgrp_LDADD += -lcrypt
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newgrp_LDADD += -lcrypt
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sulogin_LDADD += -lcrypt
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endif
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endif
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if HAVE_AUDIT
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if HAVE_AUDIT
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@ -0,0 +1,87 @@
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'\" -*- coding: UTF-8 -*-
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.\" Copyright (C) 1998-2006 Miquel van Smoorenburg.
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.TH SULOGIN 8 "17 Jan 2006" "" "Linux System Administrator's Manual"
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.SH NAME
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sulogin \- Single-user login
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.SH SYNOPSIS
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.B sulogin
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[ \fB\-e\fP ]
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[ \fB\-p\fP ]
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[ \fB\-t\fP \fISECONDS\fP ]
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[ \fITTY\fP ]
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.SH DESCRIPTION
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.I sulogin
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is invoked by \fBinit(8)\fP when the system goes into single user mode.
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(This is done through an entry in \fIinittab(5)\fP.)
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\fBInit\fP also
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tries to execute \fIsulogin\fP when
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the boot loader (e.g., \fBgrub\fP(8))
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passes it the \fB\-b\fP option.
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.PP
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The user is prompted
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.IP "" .5i
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Give root password for system maintenance
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.br
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(or type Control\-D for normal startup):
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.PP
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\fIsulogin\fP will be connected to the current terminal, or to the
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optional device that can be specified on the command line
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(typically \fB/dev/console\fP).
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.PP
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If the \fB\-t\fP option is used then the program only waits
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the given number of seconds for user input.
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.PP
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If the \fB\-p\fP option is used then the single-user shell is invoked
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with a \fIdash\fP as the first character in \fIargv[0]\fP.
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This causes the shell process to behave as a login shell.
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The default is \fInot\fP to do this,
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so that the shell will \fInot\fP read \fB/etc/profile\fP
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or \fB$HOME/.profile\fP at startup.
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.PP
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After the user exits the single-user shell,
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or presses control\-D at the prompt,
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the system will (continue to) boot to the default runlevel.
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.SH ENVIRONMENT VARIABLES
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\fIsulogin\fP looks for the environment variable \fBSUSHELL\fP or
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\fBsushell\fP to determine what shell to start. If the environment variable
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is not set, it will try to execute root's shell from /etc/passwd. If that
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fails it will fall back to \fB/bin/sh\fP.
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.PP
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This is very valuable together with the \fB\-b\fP option to init. To boot
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the system into single user mode, with the root file system mounted read/write,
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using a special "fail safe" shell that is statically linked (this example
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is valid for the LILO bootprompt)
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.PP
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boot: linux \-b rw sushell=/sbin/sash
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.SH FALLBACK METHODS
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\fIsulogin\fP checks the root password using the standard method (getpwnam)
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first.
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Then, if the \fB\-e\fP option was specified,
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\fIsulogin\fP examines these files directly to find the root password:
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.PP
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/etc/passwd,
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.br
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/etc/shadow (if present)
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.PP
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If they are damaged or nonexistent, sulogin will start a root shell
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without asking for a password. Only use the \fB\-e\fP option if you
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are sure the console is physically protected against unauthorized access.
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.SH AUTHOR
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Miquel van Smoorenburg <miquels@cistron.nl>
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.SH SEE ALSO
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init(8), inittab(5).
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@ -0,0 +1,605 @@
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/*
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* sulogin This program gives Linux machines a reasonable
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* secure way to boot single user. It forces the
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* user to supply the root password before a
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* shell is started.
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*
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* If there is a shadow password file and the
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* encrypted root password is "x" the shadow
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* password will be used.
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*
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* Version: @(#)sulogin 2.85-3 23-Apr-2003 miquels@cistron.nl
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*
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* Copyright (C) 1998-2003 Miquel van Smoorenburg.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <pwd.h>
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#include <shadow.h>
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#include <termios.h>
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#include <sys/ttydefaults.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#if defined(__GLIBC__)
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# include <crypt.h>
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#endif
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#ifdef HAVE_LIBSELINUX
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# include <selinux/selinux.h>
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# include <selinux/get_context_list.h>
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#endif
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#define CHECK_DES 1
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#define CHECK_MD5 1
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#define F_PASSWD "/etc/passwd"
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#define F_SHADOW "/etc/shadow"
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#define BINSH "/bin/sh"
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#define STATICSH "/bin/sash"
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static int timeout;
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static int profile;
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static void (*saved_sigint) = SIG_DFL;
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static void (*saved_sigtstp) = SIG_DFL;
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static void (*saved_sigquit) = SIG_DFL;
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#ifndef IUCLC
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# define IUCLC 0
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#endif
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#if defined(SANE_TIO) && (SANE_TIO == 1)
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/*
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* Fix the tty modes and set reasonable defaults.
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* (I'm not sure if this is needed under Linux, but..)
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*/
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static
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void fixtty(void)
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{
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struct termios tty;
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int serial;
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/* Skip serial console */
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if (ioctl (0, TIOCMGET, (char*)&serial) == 0)
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goto out;
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/* Expected error */
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serial = errno = 0;
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tcgetattr(0, &tty);
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/* Use defaults of <sys/ttydefaults.h> for base settings */
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tty.c_iflag |= TTYDEF_IFLAG;
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tty.c_oflag |= TTYDEF_OFLAG;
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tty.c_lflag |= TTYDEF_LFLAG;
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tty.c_cflag |= (TTYDEF_SPEED | TTYDEF_CFLAG);
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/* Sane setting, allow eight bit characters, no carriage return delay
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* the same result as `stty sane cr0 pass8'
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*/
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tty.c_iflag |= (BRKINT | ICRNL | IMAXBEL);
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#ifdef IUTF8 /* Not defined on FreeBSD */
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tty.c_iflag |= IUTF8;
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#endif /* IUTF8 */
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tty.c_iflag &= ~(IGNBRK | INLCR | IGNCR | IXOFF | IUCLC | IXANY | ISTRIP);
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tty.c_oflag |= (OPOST | ONLCR | NL0 | CR0 | TAB0 | BS0 | VT0 | FF0);
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tty.c_oflag &= ~(OLCUC | OCRNL | ONOCR | ONLRET | OFILL | OFDEL |\
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NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
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tty.c_lflag |= (ISIG | ICANON | IEXTEN | ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE);
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tty.c_lflag &= ~(ECHONL | NOFLSH | XCASE | TOSTOP | ECHOPRT);
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tty.c_cflag |= (CREAD | CS8 | B9600);
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tty.c_cflag &= ~(PARENB);
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/* VTIME and VMIN can overlap with VEOF and VEOL since they are
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* only used for non-canonical mode. We just set the at the
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* beginning, so nothing bad should happen.
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*/
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tty.c_cc[VTIME] = 0;
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tty.c_cc[VMIN] = 1;
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tty.c_cc[VINTR] = CINTR;
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tty.c_cc[VQUIT] = CQUIT;
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tty.c_cc[VERASE] = CERASE; /* ASCII DEL (0177) */
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tty.c_cc[VKILL] = CKILL;
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tty.c_cc[VEOF] = CEOF;
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tty.c_cc[VSWTC] = _POSIX_VDISABLE;
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tty.c_cc[VSTART] = CSTART;
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tty.c_cc[VSTOP] = CSTOP;
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tty.c_cc[VSUSP] = CSUSP;
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tty.c_cc[VEOL] = _POSIX_VDISABLE;
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tty.c_cc[VREPRINT] = CREPRINT;
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tty.c_cc[VDISCARD] = CDISCARD;
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tty.c_cc[VWERASE] = CWERASE;
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tty.c_cc[VLNEXT] = CLNEXT;
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tty.c_cc[VEOL2] = _POSIX_VDISABLE;
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tcsetattr(0, TCSANOW, &tty);
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out:
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return;
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}
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#endif
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/*
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* Called at timeout.
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*/
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static
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# ifdef __GNUC__
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void alrm_handler(int sig __attribute__((unused)))
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# else
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void alrm_handler(int sig)
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# endif
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{
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}
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/*
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* See if an encrypted password is valid. The encrypted
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* password is checked for traditional-style DES and
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* FreeBSD-style MD5 encryption.
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*/
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static
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int valid(const char *pass)
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{
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const char *s;
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char id[5];
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size_t len;
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off_t off;
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if (pass[0] == 0) return 1;
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#if CHECK_MD5
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if (pass[0] != '$') goto check_des;
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/*
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* up to 4 bytes for the signature e.g. $1$
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*/
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for(s = pass+1; *s && *s != '$'; s++)
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;
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if (*s++ != '$') return 0;
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if ((off = (off_t)(s-pass)) > 4 || off < 3) return 0;
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memset(id, '\0', sizeof(id));
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strncpy(id, pass, off);
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/*
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||||||
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* up to 16 bytes for the salt
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||||||
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*/
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||||||
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for(; *s && *s != '$'; s++)
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;
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||||||
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if (*s++ != '$') return 0;
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if ((off_t)(s-pass) > 16) return 0;
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||||||
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len = strlen(s);
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||||||
|
|
||||||
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/*
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||||||
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* the MD5 hash (128 bits or 16 bytes) encoded in base64 = 22 bytes
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||||||
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*/
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if ((strcmp(id, "$1$") == 0) && (len < 22 || len > 24)) return 0;
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/*
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* the SHA-256 hash 43 bytes
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*/
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if ((strcmp(id, "$5$") == 0) && (len < 42 || len > 44)) return 0;
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||||||
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/*
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* the SHA-512 hash 86 bytes
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||||||
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*/
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if ((strcmp(id, "$6$") == 0) && (len < 85 || len > 87)) return 0;
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/*
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||||||
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* e.g. Blowfish hash
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||||||
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*/
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||||||
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return 1;
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check_des:
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#endif
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#if CHECK_DES
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if (strlen(pass) != 13) return 0;
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for (s = pass; *s; s++) {
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if ((*s < '0' || *s > '9') &&
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(*s < 'a' || *s > 'z') &&
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(*s < 'A' || *s > 'Z') &&
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*s != '.' && *s != '/') return 0;
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}
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#endif
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return 1;
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}
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||||||
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/*
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||||||
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* Set a variable if the value is not NULL.
|
||||||
|
*/
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||||||
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static
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||||||
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void set(char **var, char *val)
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||||||
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{
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||||||
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if (val) *var = val;
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||||||
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}
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||||||
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|
||||||
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/*
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||||||
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* Get the root password entry.
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||||||
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*/
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||||||
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static
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||||||
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struct passwd *getrootpwent(int try_manually)
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||||||
|
{
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||||||
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static struct passwd pwd;
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||||||
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struct passwd *pw;
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||||||
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struct spwd *spw;
|
||||||
|
FILE *fp;
|
||||||
|
static char line[256];
|
||||||
|
static char sline[256];
|
||||||
|
char *p;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* First, we try to get the password the standard
|
||||||
|
* way using normal library calls.
|
||||||
|
*/
|
||||||
|
if ((pw = getpwnam("root")) &&
|
||||||
|
!strcmp(pw->pw_passwd, "x") &&
|
||||||
|
(spw = getspnam("root")))
|
||||||
|
pw->pw_passwd = spw->sp_pwdp;
|
||||||
|
if (pw || !try_manually) return pw;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If we come here, we could not retrieve the root
|
||||||
|
* password through library calls and we try to
|
||||||
|
* read the password and shadow files manually.
|
||||||
|
*/
|
||||||
|
pwd.pw_name = "root";
|
||||||
|
pwd.pw_passwd = "";
|
||||||
|
pwd.pw_gecos = "Super User";
|
||||||
|
pwd.pw_dir = "/";
|
||||||
|
pwd.pw_shell = "";
|
||||||
|
pwd.pw_uid = 0;
|
||||||
|
pwd.pw_gid = 0;
|
||||||
|
|
||||||
|
if ((fp = fopen(F_PASSWD, "r")) == NULL) {
|
||||||
|
perror(F_PASSWD);
|
||||||
|
return &pwd;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Find root in the password file.
|
||||||
|
*/
|
||||||
|
while((p = fgets(line, 256, fp)) != NULL) {
|
||||||
|
if (strncmp(line, "root:", 5) != 0)
|
||||||
|
continue;
|
||||||
|
p += 5;
|
||||||
|
set(&pwd.pw_passwd, strsep(&p, ":"));
|
||||||
|
(void)strsep(&p, ":");
|
||||||
|
(void)strsep(&p, ":");
|
||||||
|
set(&pwd.pw_gecos, strsep(&p, ":"));
|
||||||
|
set(&pwd.pw_dir, strsep(&p, ":"));
|
||||||
|
set(&pwd.pw_shell, strsep(&p, "\n"));
|
||||||
|
p = line;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
fclose(fp);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If the encrypted password is valid
|
||||||
|
* or not found, return.
|
||||||
|
*/
|
||||||
|
if (p == NULL) {
|
||||||
|
fprintf(stderr, "%s: no entry for root\n", F_PASSWD);
|
||||||
|
return &pwd;
|
||||||
|
}
|
||||||
|
if (valid(pwd.pw_passwd)) return &pwd;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The password is invalid. If there is a
|
||||||
|
* shadow password, try it.
|
||||||
|
*/
|
||||||
|
strcpy(pwd.pw_passwd, "");
|
||||||
|
if ((fp = fopen(F_SHADOW, "r")) == NULL) {
|
||||||
|
fprintf(stderr, "%s: root password garbled\n", F_PASSWD);
|
||||||
|
return &pwd;
|
||||||
|
}
|
||||||
|
while((p = fgets(sline, 256, fp)) != NULL) {
|
||||||
|
if (strncmp(sline, "root:", 5) != 0)
|
||||||
|
continue;
|
||||||
|
p += 5;
|
||||||
|
set(&pwd.pw_passwd, strsep(&p, ":"));
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
fclose(fp);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* If the password is still invalid,
|
||||||
|
* NULL it, and return.
|
||||||
|
*/
|
||||||
|
if (p == NULL) {
|
||||||
|
fprintf(stderr, "%s: no entry for root\n", F_SHADOW);
|
||||||
|
strcpy(pwd.pw_passwd, "");
|
||||||
|
}
|
||||||
|
if (!valid(pwd.pw_passwd)) {
|
||||||
|
fprintf(stderr, "%s: root password garbled\n", F_SHADOW);
|
||||||
|
strcpy(pwd.pw_passwd, ""); }
|
||||||
|
return &pwd;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Ask for the password. Note that there is no
|
||||||
|
* default timeout as we normally skip this during boot.
|
||||||
|
*/
|
||||||
|
static
|
||||||
|
char *getpasswd(char *crypted)
|
||||||
|
{
|
||||||
|
struct sigaction sa;
|
||||||
|
struct termios old, tty;
|
||||||
|
static char pass[128];
|
||||||
|
char *ret = pass;
|
||||||
|
int i;
|
||||||
|
#if defined(USE_ONELINE)
|
||||||
|
if (crypted[0])
|
||||||
|
printf("Give root password for login: ");
|
||||||
|
else
|
||||||
|
printf("Press enter for login: ");
|
||||||
|
#else
|
||||||
|
if (crypted[0])
|
||||||
|
printf("Give root password for maintenance\n");
|
||||||
|
else
|
||||||
|
printf("Press enter for maintenance");
|
||||||
|
printf("(or type Control-D to continue): ");
|
||||||
|
#endif
|
||||||
|
fflush(stdout);
|
||||||
|
|
||||||
|
tcgetattr(0, &old);
|
||||||
|
tcgetattr(0, &tty);
|
||||||
|
tty.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
|
||||||
|
tty.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
|
||||||
|
tcsetattr(0, TCSANOW, &tty);
|
||||||
|
|
||||||
|
pass[sizeof(pass) - 1] = 0;
|
||||||
|
|
||||||
|
sa.sa_handler = alrm_handler;
|
||||||
|
sa.sa_flags = 0;
|
||||||
|
sigaction(SIGALRM, &sa, NULL);
|
||||||
|
if (timeout) alarm(timeout);
|
||||||
|
|
||||||
|
if (read(0, pass, sizeof(pass) - 1) <= 0)
|
||||||
|
ret = NULL;
|
||||||
|
else {
|
||||||
|
for(i = 0; i < (int)sizeof(pass) && pass[i]; i++)
|
||||||
|
if (pass[i] == '\r' || pass[i] == '\n') {
|
||||||
|
pass[i] = 0;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
alarm(0);
|
||||||
|
tcsetattr(0, TCSANOW, &old);
|
||||||
|
printf("\n");
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Password was OK, execute a shell.
|
||||||
|
*/
|
||||||
|
static
|
||||||
|
void sushell(struct passwd *pwd)
|
||||||
|
{
|
||||||
|
char shell[128];
|
||||||
|
char home[128];
|
||||||
|
char *p;
|
||||||
|
char *sushell;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Set directory and shell.
|
||||||
|
*/
|
||||||
|
(void)chdir(pwd->pw_dir);
|
||||||
|
if ((p = getenv("SUSHELL")) != NULL)
|
||||||
|
sushell = p;
|
||||||
|
else if ((p = getenv("sushell")) != NULL)
|
||||||
|
sushell = p;
|
||||||
|
else {
|
||||||
|
if (pwd->pw_shell[0])
|
||||||
|
sushell = pwd->pw_shell;
|
||||||
|
else
|
||||||
|
sushell = BINSH;
|
||||||
|
}
|
||||||
|
if ((p = strrchr(sushell, '/')) == NULL)
|
||||||
|
p = sushell;
|
||||||
|
else
|
||||||
|
p++;
|
||||||
|
snprintf(shell, sizeof(shell), profile ? "-%s" : "%s", p);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Set some important environment variables.
|
||||||
|
*/
|
||||||
|
getcwd(home, sizeof(home));
|
||||||
|
setenv("HOME", home, 1);
|
||||||
|
setenv("LOGNAME", "root", 1);
|
||||||
|
setenv("USER", "root", 1);
|
||||||
|
if (!profile)
|
||||||
|
setenv("SHLVL","0",1);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Try to execute a shell.
|
||||||
|
*/
|
||||||
|
setenv("SHELL", sushell, 1);
|
||||||
|
signal(SIGINT, saved_sigint);
|
||||||
|
signal(SIGTSTP, saved_sigtstp);
|
||||||
|
signal(SIGQUIT, saved_sigquit);
|
||||||
|
#ifdef WITH_SELINUX
|
||||||
|
if (is_selinux_enabled() > 0) {
|
||||||
|
security_context_t scon=NULL;
|
||||||
|
char *seuser=NULL;
|
||||||
|
char *level=NULL;
|
||||||
|
if (getseuserbyname("root", &seuser, &level) == 0)
|
||||||
|
if (get_default_context_with_level(seuser, level, 0, &scon) == 0) {
|
||||||
|
if (setexeccon(scon) != 0)
|
||||||
|
fprintf(stderr, "setexeccon faile\n");
|
||||||
|
freecon(scon);
|
||||||
|
}
|
||||||
|
free(seuser);
|
||||||
|
free(level);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
execl(sushell, shell, NULL);
|
||||||
|
perror(sushell);
|
||||||
|
|
||||||
|
setenv("SHELL", BINSH, 1);
|
||||||
|
execl(BINSH, profile ? "-sh" : "sh", NULL);
|
||||||
|
perror(BINSH);
|
||||||
|
|
||||||
|
/* Fall back to staticly linked shell if both the users shell
|
||||||
|
and /bin/sh failed to execute. */
|
||||||
|
setenv("SHELL", STATICSH, 1);
|
||||||
|
execl(STATICSH, STATICSH, NULL);
|
||||||
|
perror(STATICSH);
|
||||||
|
}
|
||||||
|
|
||||||
|
static
|
||||||
|
void usage(void)
|
||||||
|
{
|
||||||
|
fprintf(stderr, "Usage: sulogin [-e] [-p] [-t timeout] [tty device]\n");
|
||||||
|
}
|
||||||
|
|
||||||
|
int main(int argc, char **argv)
|
||||||
|
{
|
||||||
|
char *tty = NULL;
|
||||||
|
char *p;
|
||||||
|
struct passwd *pwd;
|
||||||
|
int c, fd = -1;
|
||||||
|
int opt_e = 0;
|
||||||
|
pid_t pid, pgrp, ppgrp, ttypgrp;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* See if we have a timeout flag.
|
||||||
|
*/
|
||||||
|
opterr = 0;
|
||||||
|
while((c = getopt(argc, argv, "ept:")) != EOF) switch(c) {
|
||||||
|
case 't':
|
||||||
|
timeout = atoi(optarg);
|
||||||
|
break;
|
||||||
|
case 'p':
|
||||||
|
profile = 1;
|
||||||
|
break;
|
||||||
|
case 'e':
|
||||||
|
opt_e = 1;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
usage();
|
||||||
|
/* Do not exit! */
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (geteuid() != 0) {
|
||||||
|
fprintf(stderr, "sulogin: only root can run sulogin.\n");
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* See if we need to open an other tty device.
|
||||||
|
*/
|
||||||
|
saved_sigint = signal(SIGINT, SIG_IGN);
|
||||||
|
saved_sigtstp = signal(SIGQUIT, SIG_IGN);
|
||||||
|
saved_sigquit = signal(SIGTSTP, SIG_IGN);
|
||||||
|
if (optind < argc) tty = argv[optind];
|
||||||
|
|
||||||
|
if (tty || (tty = getenv("CONSOLE"))) {
|
||||||
|
|
||||||
|
if ((fd = open(tty, O_RDWR)) < 0) {
|
||||||
|
perror(tty);
|
||||||
|
fd = dup(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!isatty(fd)) {
|
||||||
|
fprintf(stderr, "%s: not a tty\n", tty);
|
||||||
|
close(fd);
|
||||||
|
} else {
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Only go through this trouble if the new
|
||||||
|
* tty doesn't fall in this process group.
|
||||||
|
*/
|
||||||
|
pid = getpid();
|
||||||
|
pgrp = getpgid(0);
|
||||||
|
ppgrp = getpgid(getppid());
|
||||||
|
ttypgrp = tcgetpgrp(fd);
|
||||||
|
|
||||||
|
if (pgrp != ttypgrp && ppgrp != ttypgrp) {
|
||||||
|
if (pid != getsid(0)) {
|
||||||
|
if (pid == getpgid(0))
|
||||||
|
setpgid(0, getpgid(getppid()));
|
||||||
|
setsid();
|
||||||
|
}
|
||||||
|
|
||||||
|
signal(SIGHUP, SIG_IGN);
|
||||||
|
if (ttypgrp > 0)
|
||||||
|
ioctl(0, TIOCNOTTY, (char *)1);
|
||||||
|
signal(SIGHUP, SIG_DFL);
|
||||||
|
close(0);
|
||||||
|
close(1);
|
||||||
|
close(2);
|
||||||
|
if (fd > 2)
|
||||||
|
close(fd);
|
||||||
|
if ((fd = open(tty, O_RDWR|O_NOCTTY)) < 0) {
|
||||||
|
perror(tty);
|
||||||
|
} else {
|
||||||
|
ioctl(0, TIOCSCTTY, (char *)1);
|
||||||
|
tcsetpgrp(fd, ppgrp);
|
||||||
|
dup2(fd, 0);
|
||||||
|
dup2(fd, 1);
|
||||||
|
dup2(fd, 2);
|
||||||
|
if (fd > 2)
|
||||||
|
close(fd);
|
||||||
|
}
|
||||||
|
} else
|
||||||
|
if (fd > 2)
|
||||||
|
close(fd);
|
||||||
|
}
|
||||||
|
} else if (getpid() == 1) {
|
||||||
|
/* We are init. We hence need to set a session anyway */
|
||||||
|
setsid();
|
||||||
|
if (ioctl(0, TIOCSCTTY, (char *)1))
|
||||||
|
perror("ioctl(TIOCSCTTY)");
|
||||||
|
}
|
||||||
|
|
||||||
|
#if defined(SANE_TIO) && (SANE_TIO == 1)
|
||||||
|
fixtty();
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Get the root password.
|
||||||
|
*/
|
||||||
|
if ((pwd = getrootpwent(opt_e)) == NULL) {
|
||||||
|
fprintf(stderr, "sulogin: cannot open password database!\n");
|
||||||
|
sleep(2);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Ask for the password.
|
||||||
|
*/
|
||||||
|
while(pwd) {
|
||||||
|
if ((p = getpasswd(pwd->pw_passwd)) == NULL) break;
|
||||||
|
if (pwd->pw_passwd[0] == 0 ||
|
||||||
|
strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd) == 0)
|
||||||
|
sushell(pwd);
|
||||||
|
saved_sigquit = signal(SIGQUIT, SIG_IGN);
|
||||||
|
saved_sigtstp = signal(SIGTSTP, SIG_IGN);
|
||||||
|
saved_sigint = signal(SIGINT, SIG_IGN);
|
||||||
|
printf("Login incorrect.\n");
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* User pressed Control-D.
|
||||||
|
*/
|
||||||
|
return 0;
|
||||||
|
}
|
Loading…
Reference in New Issue