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-rw-r--r--src/sulogin.c257
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diff --git a/src/sulogin.c b/src/sulogin.c
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+/*
+ * Copyright (c) 1989 - 1994, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2002 - 2006, Tomasz Kłoczko
+ * Copyright (c) 2007 - 2010, Nicolas François
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ * endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <fcntl.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include "defines.h"
+#include "getdef.h"
+#include "prototypes.h"
+#include "pwauth.h"
+/*@-exitarg@*/
+#include "exitcodes.h"
+
+/*
+ * Global variables
+ */
+const char *Prog;
+
+static char name[BUFSIZ];
+static char pass[BUFSIZ];
+
+static struct passwd pwent;
+
+extern char **newenvp;
+extern size_t newenvc;
+
+extern char **environ;
+
+#ifndef ALARM
+#define ALARM 60
+#endif
+
+/* local function prototypes */
+static RETSIGTYPE catch_signals (int);
+
+static RETSIGTYPE catch_signals (unused int sig)
+{
+ _exit (1);
+}
+
+/*
+ * syslogd is usually not running at the time when sulogin is typically
+ * called, cluttering the screen with unnecessary messages. Suggested by
+ * Ivan Nejgebauer <ian@unsux.ns.ac.yu>. --marekm
+ */
+#undef USE_SYSLOG
+
+ /*ARGSUSED*/ int main (int argc, char **argv)
+{
+#ifndef USE_PAM
+ const char *env;
+#endif /* !USE_PAM */
+ char **envp = environ;
+ TERMIO termio;
+ int err = 0;
+
+#ifdef USE_TERMIO
+ ioctl (0, TCGETA, &termio);
+ termio.c_iflag |= (ICRNL | IXON);
+ termio.c_oflag |= (OPOST | ONLCR);
+ termio.c_cflag |= (CREAD);
+ termio.c_lflag |= (ISIG | ICANON | ECHO | ECHOE | ECHOK);
+ ioctl (0, TCSETAF, &termio);
+#endif
+#ifdef USE_TERMIOS
+ tcgetattr (0, &termio);
+ termio.c_iflag |= (ICRNL | IXON);
+ termio.c_oflag |= (CREAD);
+ termio.c_lflag |= (ECHO | ECHOE | ECHOK | ICANON | ISIG);
+ tcsetattr (0, TCSANOW, &termio);
+#endif
+
+ Prog = Basename (argv[0]);
+ (void) setlocale (LC_ALL, "");
+ (void) bindtextdomain (PACKAGE, LOCALEDIR);
+ (void) textdomain (PACKAGE);
+
+#ifdef USE_SYSLOG
+ OPENLOG ("sulogin");
+#endif
+ initenv ();
+ if (argc > 1) {
+ close (0);
+ close (1);
+ close (2);
+
+ if (open (argv[1], O_RDWR) >= 0) {
+ dup (0);
+ dup (0);
+ } else {
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_WARN, "cannot open %s\n", argv[1]);
+ closelog ();
+#endif
+ exit (1);
+ }
+ }
+ if (access (PASSWD_FILE, F_OK) == -1) { /* must be a password file! */
+ (void) puts (_("No password file"));
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_WARN, "No password file\n");
+ closelog ();
+#endif
+ exit (1);
+ }
+#if !defined(DEBUG) && defined(SULOGIN_ONLY_INIT)
+ if (getppid () != 1) { /* parent must be INIT */
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_WARN, "Pid == %d, not 1\n", getppid ());
+ closelog ();
+#endif
+ exit (1);
+ }
+#endif
+ if ((isatty (0) == 0) || (isatty (1) == 0) || (isatty (2) == 0)) {
+#ifdef USE_SYSLOG
+ closelog ();
+#endif
+ exit (1); /* must be a terminal */
+ }
+ /* If we were init, we need to start a new session */
+ if (getppid() == 1) {
+ setsid();
+ if (ioctl(0, TIOCSCTTY, 1) != 0) {
+ (void) fputs (_("TIOCSCTTY failed"), stderr);
+ }
+ }
+ while (NULL != *envp) { /* add inherited environment, */
+ addenv (*envp, NULL); /* some variables change later */
+ envp++;
+ }
+
+#ifndef USE_PAM
+ env = getdef_str ("ENV_TZ");
+ if (NULL != env) {
+ addenv (('/' == *env) ? tz (env) : env, NULL);
+ }
+ env = getdef_str ("ENV_HZ");
+ if (NULL != env) {
+ addenv (env, NULL); /* set the default $HZ, if one */
+ }
+#endif /* !USE_PAM */
+
+ (void) strcpy (name, "root"); /* KLUDGE!!! */
+
+ (void) signal (SIGALRM, catch_signals); /* exit if the timer expires */
+ (void) alarm (ALARM); /* only wait so long ... */
+
+ while (true) { /* repeatedly get login/password pairs */
+ char *cp;
+ pw_entry (name, &pwent); /* get entry from password file */
+ if (pwent.pw_name == (char *) 0) {
+ /*
+ * Fail secure
+ */
+ (void) puts (_("No password entry for 'root'"));
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_WARN, "No password entry for 'root'\n");
+ closelog ();
+#endif
+ exit (1);
+ }
+
+ /*
+ * Here we prompt for the root password, or if no password
+ * is given we just exit.
+ */
+
+ /* get a password for root */
+ cp = getpass (_(
+"\n"
+"Type control-d to proceed with normal startup,\n"
+"(or give root password for system maintenance):"));
+ /*
+ * XXX - can't enter single user mode if root password is
+ * empty. I think this doesn't happen very often :-). But
+ * it will work with standard getpass() (no NULL on EOF).
+ * --marekm
+ */
+ if ((NULL == cp) || ('\0' == *cp)) {
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_INFO, "Normal startup\n");
+ closelog ();
+#endif
+ (void) puts ("");
+#ifdef TELINIT
+ execl (PATH_TELINIT, "telinit", RUNLEVEL, (char *) 0);
+#endif
+ exit (0);
+ } else {
+ STRFCPY (pass, cp);
+ strzero (cp);
+ }
+ if (valid (pass, &pwent)) { /* check encrypted passwords ... */
+ break; /* ... encrypted passwords matched */
+ }
+
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_WARN, "Incorrect root password\n");
+#endif
+ sleep (2);
+ (void) puts (_("Login incorrect"));
+ }
+ strzero (pass);
+ (void) alarm (0);
+ (void) signal (SIGALRM, SIG_DFL);
+ environ = newenvp; /* make new environment active */
+
+ (void) puts (_("Entering System Maintenance Mode"));
+#ifdef USE_SYSLOG
+ SYSLOG (LOG_INFO, "System Maintenance Mode\n");
+#endif
+
+#ifdef USE_SYSLOG
+ closelog ();
+#endif
+ /* exec the shell finally. */
+ err = shell (pwent.pw_shell, (char *) 0, environ);
+
+ return ((err == ENOENT) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
+}
+