X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=pppd%2Fmain.c;h=4ec593e067ce6cff787b8101f60cb707faf7cda4;hb=6d89f8d2a2b827a1165e99ea683e6c859e98693e;hp=2141879090fc378c770119c08e03c41700ef3b20;hpb=ef6f6d62459620b334457a58cb17e40f450814dc;p=ppp.git

diff --git a/pppd/main.c b/pppd/main.c
index 2141879..4ec593e 100644
--- a/pppd/main.c
+++ b/pppd/main.c
@@ -18,7 +18,7 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: main.c,v 1.54 1999/03/02 05:36:42 paulus Exp $";
+static char rcsid[] = "$Id: main.c,v 1.56 1999/03/06 11:28:10 paulus Exp $";
 #endif
 
 #include <stdio.h>
@@ -448,7 +448,16 @@ main(argc, argv)
 	hungup = 0;
 	kill_link = 0;
 	sigprocmask(SIG_UNBLOCK, &mask, NULL);
-	while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
+	for (;;) {
+	    /* If the user specified the device name, become the
+	       user before opening it. */
+	    if (!devnam_info.priv)
+		seteuid(uid);
+	    ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
+	    if (!devnam_info.priv)
+		seteuid(0);
+	    if (ttyfd >= 0)
+		break;
 	    if (errno != EINTR)
 		syslog(LOG_ERR, "Failed to open %s: %m", devnam);
 	    if (!persist || errno != EINTR)
@@ -504,7 +513,14 @@ main(argc, argv)
 
 	/* reopen tty if necessary to wait for carrier */
 	if (connector == NULL && modem) {
-	    while ((i = open(devnam, O_RDWR)) < 0) {
+	    for (;;) {
+		if (!devnam_info.priv)
+		    seteuid(uid);
+		i = open(devnam, O_RDWR);
+		if (!devnam_info.priv)
+		    seteuid(0);
+		if (i >= 0)
+		    break;
 		if (errno != EINTR)
 		    syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
 		if (!persist || errno != EINTR || hungup || kill_link)
@@ -1145,7 +1161,7 @@ device_script(program, in, out)
 		close(errfd);
 	    }
 	}
-	setuid(getuid());
+	setuid(uid);
 	setgid(getgid());
 	execl("/bin/sh", "sh", "-c", program, (char *)0);
 	syslog(LOG_ERR, "could not exec /bin/sh: %m");
@@ -1224,10 +1240,10 @@ run_program(prog, args, must_exist, done, arg)
 	int new_fd;
 
 	/* Leave the current location */
-	(void) setsid();    /* No controlling tty. */
+	(void) setsid();	/* No controlling tty. */
 	(void) umask (S_IRWXG|S_IRWXO);
-	(void) chdir ("/"); /* no current directory. */
-	setuid(geteuid());
+	(void) chdir ("/");	/* no current directory. */
+	setuid(0);		/* set real UID = root */
 	setgid(getegid());
 
 	/* Ensure that nothing of our device environment is inherited. */