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/* vi: set sw=4 ts=4: */
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <termios.h>
#include <unistd.h>
#include <utmp.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <ctype.h>
#include <time.h>
#include "busybox.h"
// sulogin defines
#define SULOGIN_PROMPT "\nGive root password for system maintenance\n" \
"(or type Control-D for normal startup):"
static const char *forbid[] = {
"ENV",
"BASH_ENV",
"HOME",
"IFS",
"PATH",
"SHELL",
"LD_LIBRARY_PATH",
"LD_PRELOAD",
"LD_TRACE_LOADED_OBJECTS",
"LD_BIND_NOW",
"LD_AOUT_LIBRARY_PATH",
"LD_AOUT_PRELOAD",
"LD_NOWARN",
"LD_KEEPDIR",
(char *) 0
};
static void catchalarm(int junk)
{
exit(EXIT_FAILURE);
}
extern int sulogin_main(int argc, char **argv)
{
char *cp;
char *device = (char *) 0;
const char *name = "root";
int timeout = 0;
static char pass[BUFSIZ];
struct termios termio;
struct passwd pwent;
struct passwd *pwd;
time_t start, now;
const char **p;
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
struct spwd *spwd = NULL;
#endif /* CONFIG_FEATURE_SHADOWPASSWDS */
tcgetattr(0, &termio);
/* set control chars */
termio.c_cc[VINTR] = 3; /* C-c */
termio.c_cc[VQUIT] = 28; /* C-\ */
termio.c_cc[VERASE] = 127; /* C-? */
termio.c_cc[VKILL] = 21; /* C-u */
termio.c_cc[VEOF] = 4; /* C-d */
termio.c_cc[VSTART] = 17; /* C-q */
termio.c_cc[VSTOP] = 19; /* C-s */
termio.c_cc[VSUSP] = 26; /* C-z */
/* use line dicipline 0 */
termio.c_line = 0;
/* Make it be sane */
termio.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
termio.c_cflag |= CREAD|HUPCL|CLOCAL;
/* input modes */
termio.c_iflag = ICRNL | IXON | IXOFF;
/* output modes */
termio.c_oflag = OPOST | ONLCR;
/* local modes */
termio.c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
tcsetattr(0, TCSANOW, &termio);
openlog("sulogin", LOG_PID | LOG_CONS | LOG_NOWAIT, LOG_AUTH);
if (argc > 1) {
if (strncmp(argv[1], "-t", 2) == 0) {
if (strcmp(argv[1], "-t") == 0) {
if (argc > 2) {
timeout = atoi(argv[2]);
if (argc > 3) {
device = argv[3];
}
}
} else {
if (argc > 2) {
device = argv[2];
}
}
} else {
device = argv[1];
}
if (device) {
close(0);
close(1);
close(2);
if (open(device, O_RDWR) >= 0) {
dup(0);
dup(0);
} else {
syslog(LOG_WARNING, "cannot open %s\n", device);
exit(EXIT_FAILURE);
}
}
}
if (access(bb_path_passwd_file, 0) == -1) {
syslog(LOG_WARNING, "No password file\n");
bb_error_msg_and_die("No password file\n");
}
if (!isatty(0) || !isatty(1) || !isatty(2)) {
exit(EXIT_FAILURE);
}
/* Clear out anything dangerous from the environment */
for (p = forbid; *p; p++)
unsetenv(*p);
signal(SIGALRM, catchalarm);
alarm(timeout);
if (!(pwd = getpwnam(name))) {
syslog(LOG_WARNING, "No password entry for `root'\n");
bb_error_msg_and_die("No password entry for `root'\n");
}
pwent = *pwd;
#ifdef CONFIG_FEATURE_SHADOWPASSWDS
spwd = NULL;
if (pwd && ((strcmp(pwd->pw_passwd, "x") == 0)
|| (strcmp(pwd->pw_passwd, "*") == 0))) {
endspent();
spwd = getspnam(name);
if (spwd) {
pwent.pw_passwd = spwd->sp_pwdp;
}
}
#endif /* CONFIG_FEATURE_SHADOWPASSWDS */
while (1) {
cp = getpass(SULOGIN_PROMPT);
if (!cp || !*cp) {
puts("\n");
fflush(stdout);
syslog(LOG_INFO, "Normal startup\n");
exit(EXIT_SUCCESS);
} else {
safe_strncpy(pass, cp, sizeof(pass));
bzero(cp, strlen(cp));
}
if (strcmp(pw_encrypt(pass, pwent.pw_passwd), pwent.pw_passwd) == 0) {
break;
}
time(&start);
now = start;
while (difftime(now, start) < FAIL_DELAY) {
sleep(FAIL_DELAY);
time(&now);
}
puts("Login incorrect");
fflush(stdout);
syslog(LOG_WARNING, "Incorrect root password\n");
}
bzero(pass, strlen(pass));
alarm(0);
signal(SIGALRM, SIG_DFL);
puts("Entering System Maintenance Mode\n");
fflush(stdout);
syslog(LOG_INFO, "System Maintenance Mode\n");
run_shell(pwent.pw_shell, 1, 0, 0);
return (0);
}
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