PPP autologin code from freebsd; do not use until pppd has been checked for security...

4 files changed, 61 insertions, 7 deletions

diff --git a/libexec/getty/gettytab.5 b/libexec/getty/gettytab.5
index fa17e6d9ecd..dac31429b55 100644
--- a/libexec/getty/gettytab.5
+++ b/libexec/getty/gettytab.5
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)gettytab.5	8.4 (Berkeley) 4/19/94
-.\"	$Id: gettytab.5,v 1.2 1996/08/11 05:41:42 deraadt Exp $
+.\"	$Id: gettytab.5,v 1.3 1996/12/10 07:58:29 deraadt Exp $
 .\"
 .Dd April 19, 1994
 .Dt GETTYTAB 5
@@ -149,6 +149,7 @@ hangup line on last close
 .It "pe	bool	false	use printer (hard copy) erase algorithm"
 .It "pf	num	0	delay"
 between first prompt and following flush (seconds)
+.It "pp	str	unused	PPP authentication program"
 .It "ps	bool	false	line connected to a"
 .Tn MICOM
 port selector
@@ -351,6 +352,12 @@ implementation.
 does not check parity of input characters in
 .Dv RAW
 mode.
+.Pp
+If
+.Em \&pp
+string is specified and a PPP link bringup sequence is recognized,
+getty will invoke the program referenced by the pp option.  This
+can be used to handle incoming PPP calls.
 .Sh SEE ALSO
 .Xr login 1 ,
 .Xr gethostname 2 ,
diff --git a/libexec/getty/gettytab.h b/libexec/getty/gettytab.h
index 155b774fc61..702e6e76407 100644
--- a/libexec/getty/gettytab.h
+++ b/libexec/getty/gettytab.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)gettytab.h	8.2 (Berkeley) 3/30/94
- *	$Id: gettytab.h,v 1.1.1.1 1995/10/18 08:43:17 deraadt Exp $
+ *	$Id: gettytab.h,v 1.2 1996/12/10 07:58:31 deraadt Exp $
  */
 
 /*
@@ -85,6 +85,7 @@ struct gettyflags {
 #define FL	gettystrs[21].value
 #define WE	gettystrs[22].value
 #define LN	gettystrs[23].value
+#define PP	gettystrs[25].value
 
 /*
  * Numeric definitions.
diff --git a/libexec/getty/init.c b/libexec/getty/init.c
index dc9b9f44956..3353bd016a1 100644
--- a/libexec/getty/init.c
+++ b/libexec/getty/init.c
@@ -33,7 +33,7 @@
 
 #ifndef lint
 /*static char sccsid[] = "from: @(#)init.c	8.1 (Berkeley) 6/4/93";*/
-static char rcsid[] = "$Id: init.c,v 1.2 1996/05/17 22:41:16 deraadt Exp $";
+static char rcsid[] = "$Id: init.c,v 1.3 1996/12/10 07:58:33 deraadt Exp $";
 #endif /* not lint */
 
 /*
@@ -73,6 +73,7 @@ struct	gettystrs gettystrs[] = {
 	{ "fl", &tmode.c_cc[VDISCARD] },/* flush output */
 	{ "we", &tmode.c_cc[VWERASE] },	/* word erase */
 	{ "ln", &tmode.c_cc[VLNEXT] },	/* literal next */
+	{ "pp" },			/* ppp login program */
 	{ 0 }
 };
 
diff --git a/libexec/getty/main.c b/libexec/getty/main.c
index 06fdaf02dcf..44b2b942c1e 100644
--- a/libexec/getty/main.c
+++ b/libexec/getty/main.c
@@ -39,7 +39,7 @@ static char copyright[] =
 
 #ifndef lint
 /*static char sccsid[] = "from: @(#)main.c	8.1 (Berkeley) 6/20/93";*/
-static char rcsid[] = "$Id: main.c,v 1.4 1996/05/22 12:10:13 deraadt Exp $";
+static char rcsid[] = "$Id: main.c,v 1.5 1996/12/10 07:58:34 deraadt Exp $";
 #endif /* not lint */
 
 #include <sys/param.h>
@@ -73,6 +73,16 @@ static char rcsid[] = "$Id: main.c,v 1.4 1996/05/22 12:10:13 deraadt Exp $";
  */
 #define GETTY_TIMEOUT	60 /* seconds */
 
+/* defines for auto detection of incoming PPP calls (->PAP/CHAP) */
+
+#define PPP_FRAME           0x7e  /* PPP Framing character */
+#define PPP_STATION         0xff  /* "All Station" character */
+#define PPP_ESCAPE          0x7d  /* Escape Character */
+#define PPP_CONTROL         0x03  /* PPP Control Field */
+#define PPP_CONTROL_ESCAPED 0x23  /* PPP Control Field, escaped */
+#define PPP_LCP_HI          0xc0  /* LCP protocol - high byte */
+#define PPP_LCP_LOW         0x21  /* LCP protocol - low byte */
+
 struct termios tmode, omode;
 
 int crmod, digit, lower, upper;
@@ -167,6 +177,7 @@ main(argc, argv)
 	long allflags;
 	int repcnt = 0, failopenlogged = 0;
 	struct rlimit limit;
+	int rval;
 
 	signal(SIGINT, SIG_IGN);
 /*
@@ -284,7 +295,11 @@ main(argc, argv)
 			signal(SIGALRM, dingdong);
 			alarm(TO);
 		}
-		if (getname()) {
+		if ((rval = getname()) == 2) {
+			execle(PP, "ppplogin", ttyn, (char *) 0, env);
+			syslog(LOG_ERR, "%s: %m", PP);
+			exit(1);
+		} else if (rval) {
 			register int i;
 
 			oflush();
@@ -336,7 +351,9 @@ getname()
 {
 	register int c;
 	register char *np;
-	char cs;
+	unsigned char cs;
+	int ppp_state;
+	int ppp_connection = 0;
 
 	/*
 	 * Interrupt may happen if we use CBREAK mode
@@ -365,6 +382,34 @@ getname()
 			exit(0);
 		if ((c = cs&0177) == 0)
 			return (0);
+
+		/*
+		 * PPP detection state machine..
+		 * Look for sequences:
+		 * PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or
+		 * PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC)
+		 * See RFC1662.
+		 * Derived from code from Michael Hancock <michaelh@cet.co.jp>
+		 * and Erik 'PPP' Olson <eriko@wrq.com>
+		 */
+		if (PP && cs == PPP_FRAME) {
+			ppp_state = 1;
+		} else if (ppp_state == 1 && cs == PPP_STATION) {
+			ppp_state = 2;
+		} else if (ppp_state == 2 && cs == PPP_ESCAPE) {
+			ppp_state = 3;
+		} else if ((ppp_state == 2 && cs == PPP_CONTROL) ||
+		    (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) {
+			ppp_state = 4;
+		} else if (ppp_state == 4 && cs == PPP_LCP_HI) {
+			ppp_state = 5;
+		} else if (ppp_state == 5 && cs == PPP_LCP_LOW) {
+			ppp_connection = 1;
+			break;
+		} else {
+			ppp_state = 0;
+		}
+
 		if (c == EOT)
 			exit(1);
 		if (c == '\r' || c == '\n' || np >= &name[sizeof name]) {
@@ -410,7 +455,7 @@ getname()
 		for (np = name; *np; np++)
 			if (isupper(*np))
 				*np = tolower(*np);
-	return (1);
+	return (1 + ppp_connection);
 }
 
 static void