Add support for printking Kerberos v4 packets (file I forgot to add)

Obtained from:	John Hawkinson <jhawk@mit.edu> by way of comp.protocols.kerberos

1 files changed, 294 insertions, 0 deletions

diff --git a/usr.sbin/tcpdump/tcpdump/print-krb.c b/usr.sbin/tcpdump/tcpdump/print-krb.c
new file mode 100644
index 0000000..e547072
--- /dev/null
+++ b/usr.sbin/tcpdump/tcpdump/print-krb.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (c) 1995
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Initial contribution from John Hawkinson (jhawk@mit.edu).
+ */
+
+#ifndef lint
+static char rcsid[] =
+	"$Id$";
+/*
+    "@(#) Header: /afs/sipb/project/tcpdump/src/tcpdump-3.0.2/RCS/print-krb.c,v 1.3 1995/08/16 05:33:27 jhawk Exp ";
+*/
+#endif
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "interface.h"
+#include "addrtoname.h"
+
+const char *c_print(register const u_char *s, register const u_char *ep);
+const u_char *krb4_print_hdr(const u_char *cp);
+void krb4_print(const u_char *cp);
+void krb_print(const u_char *dat, int length);
+
+
+#define         AUTH_MSG_KDC_REQUEST                     1<<1
+#define         AUTH_MSG_KDC_REPLY                       2<<1
+#define         AUTH_MSG_APPL_REQUEST                    3<<1
+#define         AUTH_MSG_APPL_REQUEST_MUTUAL             4<<1
+#define         AUTH_MSG_ERR_REPLY                       5<<1
+#define         AUTH_MSG_PRIVATE                         6<<1
+#define         AUTH_MSG_SAFE                            7<<1
+#define         AUTH_MSG_APPL_ERR                        8<<1
+#define         AUTH_MSG_DIE                            63<<1
+
+#define         KERB_ERR_OK                              0
+#define         KERB_ERR_NAME_EXP                        1
+#define         KERB_ERR_SERVICE_EXP                     2
+#define         KERB_ERR_AUTH_EXP                        3
+#define         KERB_ERR_PKT_VER                         4
+#define         KERB_ERR_NAME_MAST_KEY_VER               5
+#define         KERB_ERR_SERV_MAST_KEY_VER               6
+#define         KERB_ERR_BYTE_ORDER                      7
+#define         KERB_ERR_PRINCIPAL_UNKNOWN               8
+#define         KERB_ERR_PRINCIPAL_NOT_UNIQUE            9
+#define         KERB_ERR_NULL_KEY                       10
+
+struct krb {
+  u_char pvno;		/* Protocol Version */
+  u_char type;		/* Type+B */
+} ;
+
+static char tstr[] = " [|kerberos]";
+
+static struct token type2str[] = { 
+    { AUTH_MSG_KDC_REQUEST,		"KDC_REQUEST" },
+    { AUTH_MSG_KDC_REPLY,		"KDC_REPLY" },
+    { AUTH_MSG_APPL_REQUEST,		"APPL_REQUEST" },
+    { AUTH_MSG_APPL_REQUEST_MUTUAL,	"APPL_REQUEST_MUTUAL" },
+    { AUTH_MSG_ERR_REPLY,		"ERR_REPLY" },
+    { AUTH_MSG_PRIVATE,			"PRIVATE" },
+    { AUTH_MSG_SAFE,			"SAFE" },
+    { AUTH_MSG_APPL_ERR,		"APPL_ERR" },
+    { AUTH_MSG_DIE,			"DIE" },
+    { 0,				NULL }
+};
+
+static struct token kerr2str[] = {
+    { KERB_ERR_OK,                 	"OK" },
+    { KERB_ERR_NAME_EXP,           	"NAME_EXP" },
+    { KERB_ERR_SERVICE_EXP,    	   	"SERVICE_EXP" },
+    { KERB_ERR_AUTH_EXP,           	"AUTH_EXP" },   
+    { KERB_ERR_PKT_VER,            	"PKT_VER" }, 
+    { KERB_ERR_NAME_MAST_KEY_VER,   	"NAME_MAST_KEY_VER" },
+    { KERB_ERR_SERV_MAST_KEY_VER,  	"SERV_MAST_KEY_VER" },
+    { KERB_ERR_BYTE_ORDER,         	"BYTE_ORDER" },       
+    { KERB_ERR_PRINCIPAL_UNKNOWN,  	"PRINCIPAL_UNKNOWN" },
+    { KERB_ERR_PRINCIPAL_NOT_UNIQUE,	"PRINCIPAL_NOT_UNIQUE" },
+    { KERB_ERR_NULL_KEY,            	"NULL_KEY"},    	 
+    { 0,				NULL}
+  };
+
+
+/* little endian (unaligned) to host byte order */
+#define vtohlp(x)	    ((( ((char*)(x))[0] )      )  | \
+			     (( ((char*)(x))[1] ) <<  8)  | \
+			     (( ((char*)(x))[2] ) << 16)  | \
+			     (( ((char*)(x))[3] ) << 24))
+#define vtohsp(x)          ((( ((char*)(x))[0] )      )  | \
+			     (( ((char*)(x))[1] ) <<  8))
+/* network (big endian) (unaligned) to host byte order */
+#define ntohlp(x)	    ((( ((char*)(x))[3] )      )  | \
+			     (( ((char*)(x))[2] ) <<  8)  | \
+			     (( ((char*)(x))[1] ) << 16)  | \
+			     (( ((char*)(x))[0] ) << 24))
+#define ntohsp(x)          ((( ((char*)(x))[1] )      )  | \
+			     (( ((char*)(x))[0] ) <<  8))
+
+
+
+const char *
+c_print(register const u_char *s, register const u_char *ep)
+{
+	register u_char c;
+	register int flag;
+
+	flag = 1;
+	while (ep == NULL || s < ep) {
+		c = *s++;
+		if (c == '\0') {
+			flag = 0;
+			break;
+		}
+		if (!isascii(c)) {
+			c = toascii(c);
+			putchar('M');
+			putchar('-');
+		}
+		if (!isprint(c)) {
+			c ^= 0x40;	/* DEL to ?, others to alpha */
+			putchar('^');
+		}
+		putchar(c);
+	}
+	if (flag)
+	  return NULL;
+	return(s);
+}
+
+
+const u_char *
+krb4_print_hdr(const u_char *cp)
+{
+	  cp+=2;
+
+#define TCHECK		if (cp >= snapend)  goto trunc
+#define PRINT		if ((cp=c_print(cp, snapend))==NULL) goto trunc
+
+	  TCHECK;
+	  PRINT;
+	  TCHECK;
+	  putchar('.'); PRINT;
+	  TCHECK;
+	  putchar('@'); PRINT;
+	  return(cp);
+
+	  trunc:
+	    fputs(tstr, stdout);
+	    return(NULL);
+
+#undef TCHECK
+#undef PRINT
+}
+
+void krb4_print(const u_char *cp)
+{
+	register const struct krb *kp;
+	u_char type;
+	u_short len;
+
+#define TCHECK		if (cp >= snapend) goto trunc
+#define PRINT		if ((cp=c_print(cp, snapend))==NULL) goto trunc
+#define ENDIAN		(kp->type & 0x01)
+/* ENDIAN is 1 for little, 0 for big */
+
+	kp = (struct krb *)cp;
+
+	if ((&kp->type) >= snapend) {
+		fputs(tstr, stdout);
+		return;
+	}
+
+	type = kp->type & (0xFF << 1);
+
+	printf(" %s %s: ", ENDIAN?"le":"be", tok2str(type2str, NULL, type));
+
+	switch(type) {
+	case AUTH_MSG_KDC_REQUEST:
+	  if ((cp=krb4_print_hdr(cp)) == NULL)
+	    return;
+	  cp+=4; 	  /* ctime */
+	  TCHECK;
+	  printf(" %dmin ", *cp++ * 5);
+	  TCHECK;
+	  PRINT;
+	  TCHECK;
+	  putchar('.');  PRINT;
+	  break;
+	case AUTH_MSG_APPL_REQUEST:
+	  cp+=2;
+	  TCHECK;
+	  printf("v%d ", *cp++);
+	  TCHECK;
+	  PRINT;
+	  TCHECK;
+	  printf(" (%d)", *cp++);
+	  TCHECK;
+	  printf(" (%d)", *cp);
+	  TCHECK;
+	  break;
+	case AUTH_MSG_KDC_REPLY:
+	  if ((cp=krb4_print_hdr(cp)) == NULL)
+	    return;
+	  cp+=10; /* timestamp + n + exp + kvno */
+	  TCHECK;
+	  len=ENDIAN? vtohsp(cp) : ntohsp(cp);
+	  printf(" (%d)", len);
+	  TCHECK;
+	  break;
+	case AUTH_MSG_ERR_REPLY:
+	  if ((cp=krb4_print_hdr(cp)) == NULL)
+	    return;
+	  cp+=4; 	  /* timestamp */
+	  TCHECK;
+	  printf(" %s ", tok2str(kerr2str, NULL,
+				 ENDIAN? vtohlp(cp) :
+				         ntohlp(cp)
+				 ));
+	  cp+=4;
+	  TCHECK;
+	  PRINT;
+	  break;
+	default:
+	  fputs("(unknown)", stdout);
+	  break;
+	}
+
+	return;
+trunc:
+	fputs(tstr, stdout);
+#undef TCHECK
+}
+
+void
+krb_print(const u_char *dat, int length)
+{
+	register const struct krb *kp;
+
+	kp = (struct krb *)dat;
+
+	if (dat >= snapend) {
+	  fputs(tstr, stdout);
+	  return;
+	}
+
+	switch (kp->pvno) {
+	case 1:
+	case 2:
+	case 3:
+	  printf(" v%d", kp->pvno);
+	  break;
+	case 4:
+	  printf(" v%d", kp->pvno);
+	  krb4_print((const u_char*)kp);
+	  break;
+	case 106:
+	case 107:
+	  fputs(" v5", stdout);
+	  /* Decode ASN.1 here "someday" */
+	  break;
+	}
+	return;
+}