From 00c1ae9c3963b23f1fe010fee051ffb1be1eb7ae Mon Sep 17 00:00:00 2001
From: Theo de Raadt <deraadt@cvs.openbsd.org>
Date: Wed, 20 Dec 1995 09:48:25 +0000
Subject: add ability to zero out entry; from millert@cs.colorado.edu; netbsd
 pr#1851 also add a prototype for skeyzero()

---
 lib/libskey/skey.h          |  3 ++-
 lib/libskey/skeylogin.c     | 30 +++++++++++++++++++++++++++++-
 usr.bin/skeyinit/skeyinit.1 |  3 +++
 usr.bin/skeyinit/skeyinit.c | 26 ++++++++++++++++++--------
 4 files changed, 52 insertions(+), 10 deletions(-)

diff --git a/lib/libskey/skey.h b/lib/libskey/skey.h
index 1cc7c4a4b1c..1d7f596a9ea 100644
--- a/lib/libskey/skey.h
+++ b/lib/libskey/skey.h
@@ -11,7 +11,7 @@
  *
  * Main client header
  *
- * $Id: skey.h,v 1.1 1995/10/18 08:43:11 deraadt Exp $
+ * $Id: skey.h,v 1.2 1995/12/20 09:48:23 deraadt Exp $
  */
 
 #if	defined(__TURBOC__) || defined(__STDC__) || defined(LATTICE)
@@ -61,6 +61,7 @@ void rip __ARGS ((char *buf));
 int skeychallenge __ARGS ((struct skey * mp, char *name, char *ss));
 int skeylookup __ARGS ((struct skey * mp, char *name));
 int skeyverify __ARGS ((struct skey * mp, char *response));
+int skeyzero __ARGS ((struct skey * mp, char *response));
 void sevenbit __ARGS ((char *s));
 void backspace __ARGS ((char *s));
 char *skipspace __ARGS ((char *s));
diff --git a/lib/libskey/skeylogin.c b/lib/libskey/skeylogin.c
index 0c7a7feaa6a..000a61b6200 100644
--- a/lib/libskey/skeylogin.c
+++ b/lib/libskey/skeylogin.c
@@ -8,7 +8,7 @@
  *
  * S/KEY verification check, lookups, and authentication.
  * 
- * $Id: skeylogin.c,v 1.1 1995/10/18 08:43:11 deraadt Exp $
+ * $Id: skeylogin.c,v 1.2 1995/12/20 09:48:24 deraadt Exp $
  */
 
 #include <sys/param.h>
@@ -364,3 +364,31 @@ skey_authenticate (username)
 	}
 	return -1;
 }
+
+/* Comment out user's entry in the s/key database
+ *
+ * Return codes:
+ * -1: Write error; database unchanged
+ *  0:  Database updated
+ *
+ * The database file is always closed by this call.
+ */
+int
+skeyzero(mp, response)
+	struct skey *mp;
+	char *response;
+{
+	/*
+	 * Seek to the right place and write comment character
+	 * which effectively zero's out the entry.
+	 */
+	fseek(mp->keyfile, mp->recstart, 0);
+	if (fputc('#', mp->keyfile) == EOF) {
+		fclose(mp->keyfile);
+		return -1;
+	}
+
+	fclose(mp->keyfile);
+	
+	return 0;
+}
diff --git a/usr.bin/skeyinit/skeyinit.1 b/usr.bin/skeyinit/skeyinit.1
index 249a886cc00..725dc5340e0 100644
--- a/usr.bin/skeyinit/skeyinit.1
+++ b/usr.bin/skeyinit/skeyinit.1
@@ -10,6 +10,7 @@
 .Sh SYNOPSIS
 .Nm skeyinit
 .Op Fl s
+.Op Fl z
 .Op Ar user
 .Sh DESCRIPTION
 .Nm skeyinit
@@ -28,6 +29,8 @@ then run
 in another window to generate the correct 6 english words
 for that count and seed.
 You can then "cut-and-paste" or type the words into the skeyinit window.
+.It Fl z
+allows the user to zero their S/Key entry.
 .It Ar user
 the username to be changed/added. By default the current user is
 operated on.
diff --git a/usr.bin/skeyinit/skeyinit.c b/usr.bin/skeyinit/skeyinit.c
index 684af16d9b8..b94327239f5 100644
--- a/usr.bin/skeyinit/skeyinit.c
+++ b/usr.bin/skeyinit/skeyinit.c
@@ -29,13 +29,14 @@
 #define NAMELEN 2
 
 int skeylookup __ARGS((struct skey * mp, char *name));
+int skeyzero __ARGS((struct skey * mp, char *name));
 
 int
 main(argc, argv)
 	int     argc;
 	char   *argv[];
 {
-	int     rval, n, nn, i, defaultsetup, l;
+	int     rval, n, nn, i, defaultsetup, l, zerokey = 0;
 	time_t  now;
 	char	hostname[MAXHOSTNAMELEN];
 	char    seed[18], tmp[80], key[8], defaultseed[17];
@@ -63,14 +64,15 @@ main(argc, argv)
 		err(1, "Who are you?");
 
 	defaultsetup = 1;
-	if (argc > 1) {
-		if (strcmp("-s", argv[1]) == 0)
+	for (i=1; i < argc; i++) {
+		if (strcmp("-s", argv[i]) == 0)
 			defaultsetup = 0;
-		else
-			pp = getpwnam(argv[1]);
-
-		if (argc > 2)
-			pp = getpwnam(argv[2]);
+		else if (strcmp("-z", argv[i]) == 0)
+			zerokey = 1;
+		else {
+			pp = getpwnam(argv[i]);
+			break;
+		}
 	}
 	if (pp == NULL) {
 		err(1, "User unknown");
@@ -104,6 +106,10 @@ main(argc, argv)
 	case -1:
 		err(1, "cannot open database");
 	case 0:
+		/* comment out user if asked to */
+		if (zerokey)
+			exit(skeyzero(&skey, pp->pw_name));
+
 		printf("[Updating %s]\n", pp->pw_name);
 		printf("Old key: %s\n", skey.seed);
 
@@ -127,6 +133,10 @@ main(argc, argv)
 		}
 		break;
 	case 1:
+		if (zerokey) {
+			printf("You have no entry to zero.\n");
+			exit(1);
+		}
 		printf("[Adding %s]\n", pp->pw_name);
 		break;
 	}
-- 
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