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print-krb.c revision 1.2.12.1 
      1 /*
      2  * Copyright (c) 1995, 1996, 1997
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  *
     21  * Initial contribution from John Hawkinson (jhawk (at) mit.edu).
     22  */
     23 
     24 #include <sys/cdefs.h>
     25 #ifndef lint
     26 #if 0
     27 static const char rcsid[] _U_ =
     28     "@(#) Header: /tcpdump/master/tcpdump/print-krb.c,v 1.23 2003-11-16 09:36:26 guy Exp ";
     29 #else
     30 __RCSID("$NetBSD: print-krb.c,v 1.2.12.1 2013/06/23 06:28:29 tls Exp $");
     31 #endif
     32 #endif
     33 
     34 #ifdef HAVE_CONFIG_H
     35 #include "config.h"
     36 #endif
     37 
     38 #include <tcpdump-stdinc.h>
     39 
     40 #include <stdio.h>
     41 
     42 #include "interface.h"
     43 #include "addrtoname.h"
     44 #include "extract.h"
     45 
     46 static const u_char *c_print(register const u_char *, register const u_char *);
     47 static const u_char *krb4_print_hdr(const u_char *);
     48 static void krb4_print(const u_char *);
     49 
     50 #define AUTH_MSG_KDC_REQUEST			1<<1
     51 #define AUTH_MSG_KDC_REPLY			2<<1
     52 #define AUTH_MSG_APPL_REQUEST			3<<1
     53 #define AUTH_MSG_APPL_REQUEST_MUTUAL		4<<1
     54 #define AUTH_MSG_ERR_REPLY			5<<1
     55 #define AUTH_MSG_PRIVATE			6<<1
     56 #define AUTH_MSG_SAFE				7<<1
     57 #define AUTH_MSG_APPL_ERR			8<<1
     58 #define AUTH_MSG_DIE				63<<1
     59 
     60 #define KERB_ERR_OK				0
     61 #define KERB_ERR_NAME_EXP			1
     62 #define KERB_ERR_SERVICE_EXP			2
     63 #define KERB_ERR_AUTH_EXP			3
     64 #define KERB_ERR_PKT_VER			4
     65 #define KERB_ERR_NAME_MAST_KEY_VER		5
     66 #define KERB_ERR_SERV_MAST_KEY_VER		6
     67 #define KERB_ERR_BYTE_ORDER			7
     68 #define KERB_ERR_PRINCIPAL_UNKNOWN		8
     69 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE		9
     70 #define KERB_ERR_NULL_KEY			10
     71 
     72 struct krb {
     73 	u_int8_t pvno;		/* Protocol Version */
     74 	u_int8_t type;		/* Type+B */
     75 };
     76 
     77 static char tstr[] = " [|kerberos]";
     78 
     79 static struct tok type2str[] = {
     80 	{ AUTH_MSG_KDC_REQUEST,		"KDC_REQUEST" },
     81 	{ AUTH_MSG_KDC_REPLY,		"KDC_REPLY" },
     82 	{ AUTH_MSG_APPL_REQUEST,	"APPL_REQUEST" },
     83 	{ AUTH_MSG_APPL_REQUEST_MUTUAL,	"APPL_REQUEST_MUTUAL" },
     84 	{ AUTH_MSG_ERR_REPLY,		"ERR_REPLY" },
     85 	{ AUTH_MSG_PRIVATE,		"PRIVATE" },
     86 	{ AUTH_MSG_SAFE,		"SAFE" },
     87 	{ AUTH_MSG_APPL_ERR,		"APPL_ERR" },
     88 	{ AUTH_MSG_DIE,			"DIE" },
     89 	{ 0,				NULL }
     90 };
     91 
     92 static struct tok kerr2str[] = {
     93 	{ KERB_ERR_OK,			"OK" },
     94 	{ KERB_ERR_NAME_EXP,		"NAME_EXP" },
     95 	{ KERB_ERR_SERVICE_EXP,		"SERVICE_EXP" },
     96 	{ KERB_ERR_AUTH_EXP,		"AUTH_EXP" },
     97 	{ KERB_ERR_PKT_VER,		"PKT_VER" },
     98 	{ KERB_ERR_NAME_MAST_KEY_VER,	"NAME_MAST_KEY_VER" },
     99 	{ KERB_ERR_SERV_MAST_KEY_VER,	"SERV_MAST_KEY_VER" },
    100 	{ KERB_ERR_BYTE_ORDER,		"BYTE_ORDER" },
    101 	{ KERB_ERR_PRINCIPAL_UNKNOWN,	"PRINCIPAL_UNKNOWN" },
    102 	{ KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
    103 	{ KERB_ERR_NULL_KEY,		"NULL_KEY"},
    104 	{ 0,				NULL}
    105 };
    106 
    107 static const u_char *
    108 c_print(register const u_char *s, register const u_char *ep)
    109 {
    110 	register u_char c;
    111 	register int flag;
    112 
    113 	flag = 1;
    114 	while (s < ep) {
    115 		c = *s++;
    116 		if (c == '\0') {
    117 			flag = 0;
    118 			break;
    119 		}
    120 		if (!isascii(c)) {
    121 			c = toascii(c);
    122 			putchar('M');
    123 			putchar('-');
    124 		}
    125 		if (!isprint(c)) {
    126 			c ^= 0x40;	/* DEL to ?, others to alpha */
    127 			putchar('^');
    128 		}
    129 		putchar(c);
    130 	}
    131 	if (flag)
    132 		return NULL;
    133 	return (s);
    134 }
    135 
    136 static const u_char *
    137 krb4_print_hdr(const u_char *cp)
    138 {
    139 	cp += 2;
    140 
    141 #define PRINT		if ((cp = c_print(cp, snapend)) == NULL) goto trunc
    142 
    143 	PRINT;
    144 	putchar('.');
    145 	PRINT;
    146 	putchar('@');
    147 	PRINT;
    148 	return (cp);
    149 
    150 trunc:
    151 	fputs(tstr, stdout);
    152 	return (NULL);
    153 
    154 #undef PRINT
    155 }
    156 
    157 static void
    158 krb4_print(const u_char *cp)
    159 {
    160 	register const struct krb *kp;
    161 	u_char type;
    162 	u_short len;
    163 
    164 #define PRINT		if ((cp = c_print(cp, snapend)) == NULL) goto trunc
    165 /*  True if struct krb is little endian */
    166 #define IS_LENDIAN(kp)	(((kp)->type & 0x01) != 0)
    167 #define KTOHSP(kp, cp)	(IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp))
    168 
    169 	kp = (struct krb *)cp;
    170 
    171 	if ((&kp->type) >= snapend) {
    172 		fputs(tstr, stdout);
    173 		return;
    174 	}
    175 
    176 	type = kp->type & (0xFF << 1);
    177 
    178 	printf(" %s %s: ",
    179 	    IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
    180 
    181 	switch (type) {
    182 
    183 	case AUTH_MSG_KDC_REQUEST:
    184 		if ((cp = krb4_print_hdr(cp)) == NULL)
    185 			return;
    186 		cp += 4;	/* ctime */
    187 		TCHECK(*cp);
    188 		printf(" %dmin ", *cp++ * 5);
    189 		PRINT;
    190 		putchar('.');
    191 		PRINT;
    192 		break;
    193 
    194 	case AUTH_MSG_APPL_REQUEST:
    195 		cp += 2;
    196 		TCHECK(*cp);
    197 		printf("v%d ", *cp++);
    198 		PRINT;
    199 		TCHECK(*cp);
    200 		printf(" (%d)", *cp++);
    201 		TCHECK(*cp);
    202 		printf(" (%d)", *cp);
    203 		break;
    204 
    205 	case AUTH_MSG_KDC_REPLY:
    206 		if ((cp = krb4_print_hdr(cp)) == NULL)
    207 			return;
    208 		cp += 10;	/* timestamp + n + exp + kvno */
    209 		TCHECK2(*cp, sizeof(short));
    210 		len = KTOHSP(kp, cp);
    211 		printf(" (%d)", len);
    212 		break;
    213 
    214 	case AUTH_MSG_ERR_REPLY:
    215 		if ((cp = krb4_print_hdr(cp)) == NULL)
    216 			return;
    217 		cp += 4; 	  /* timestamp */
    218 		TCHECK2(*cp, sizeof(short));
    219 		printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
    220 		cp += 4;
    221 		PRINT;
    222 		break;
    223 
    224 	default:
    225 		fputs("(unknown)", stdout);
    226 		break;
    227 	}
    228 
    229 	return;
    230 trunc:
    231 	fputs(tstr, stdout);
    232 }
    233 
    234 void
    235 krb_print(const u_char *dat)
    236 {
    237 	register const struct krb *kp;
    238 
    239 	kp = (struct krb *)dat;
    240 
    241 	if (dat >= snapend) {
    242 		fputs(tstr, stdout);
    243 		return;
    244 	}
    245 
    246 	switch (kp->pvno) {
    247 
    248 	case 1:
    249 	case 2:
    250 	case 3:
    251 		printf(" v%d", kp->pvno);
    252 		break;
    253 
    254 	case 4:
    255 		printf(" v%d", kp->pvno);
    256 		krb4_print((const u_char *)kp);
    257 		break;
    258 
    259 	case 106:
    260 	case 107:
    261 		fputs(" v5", stdout);
    262 		/* Decode ASN.1 here "someday" */
    263 		break;
    264 	}
    265 	return;
    266 }
    267