Port over the last of the tinylogin applets

 -Erik

1 files changed, 184 insertions, 0 deletions

diff --git a/loginutils/sulogin.c b/loginutils/sulogin.c
new file mode 100644
index 000000000..a654ffb89
--- /dev/null
+++ b/loginutils/sulogin.c
@@ -0,0 +1,184 @@
+/* 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(passwd_file, 0) == -1) {
+		syslog(LOG_WARNING, "No password file\n");
+		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");
+		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);
+}