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      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 #ifndef lint
     25 static const char rcsid[] _U_ =
     26     "@(#) $Header: /tcpdump/master/tcpdump/print-krb.c,v 1.23 2003-11-16 09:36:26 guy Exp $";
     27 #endif
     28 
     29 #ifdef HAVE_CONFIG_H
     30 #include "config.h"
     31 #endif
     32 
     33 #include <tcpdump-stdinc.h>
     34 
     35 #include <stdio.h>
     36 
     37 #include "interface.h"
     38 #include "addrtoname.h"
     39 #include "extract.h"
     40 
     41 static const u_char *c_print(register const u_char *, register const u_char *);
     42 static const u_char *krb4_print_hdr(const u_char *);
     43 static void krb4_print(const u_char *);
     44 
     45 #define AUTH_MSG_KDC_REQUEST			1<<1
     46 #define AUTH_MSG_KDC_REPLY			2<<1
     47 #define AUTH_MSG_APPL_REQUEST			3<<1
     48 #define AUTH_MSG_APPL_REQUEST_MUTUAL		4<<1
     49 #define AUTH_MSG_ERR_REPLY			5<<1
     50 #define AUTH_MSG_PRIVATE			6<<1
     51 #define AUTH_MSG_SAFE				7<<1
     52 #define AUTH_MSG_APPL_ERR			8<<1
     53 #define AUTH_MSG_DIE				63<<1
     54 
     55 #define KERB_ERR_OK				0
     56 #define KERB_ERR_NAME_EXP			1
     57 #define KERB_ERR_SERVICE_EXP			2
     58 #define KERB_ERR_AUTH_EXP			3
     59 #define KERB_ERR_PKT_VER			4
     60 #define KERB_ERR_NAME_MAST_KEY_VER		5
     61 #define KERB_ERR_SERV_MAST_KEY_VER		6
     62 #define KERB_ERR_BYTE_ORDER			7
     63 #define KERB_ERR_PRINCIPAL_UNKNOWN		8
     64 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE		9
     65 #define KERB_ERR_NULL_KEY			10
     66 
     67 struct krb {
     68 	u_int8_t pvno;		/* Protocol Version */
     69 	u_int8_t type;		/* Type+B */
     70 };
     71 
     72 static char tstr[] = " [|kerberos]";
     73 
     74 static const struct tok type2str[] = {
     75 	{ AUTH_MSG_KDC_REQUEST,		"KDC_REQUEST" },
     76 	{ AUTH_MSG_KDC_REPLY,		"KDC_REPLY" },
     77 	{ AUTH_MSG_APPL_REQUEST,	"APPL_REQUEST" },
     78 	{ AUTH_MSG_APPL_REQUEST_MUTUAL,	"APPL_REQUEST_MUTUAL" },
     79 	{ AUTH_MSG_ERR_REPLY,		"ERR_REPLY" },
     80 	{ AUTH_MSG_PRIVATE,		"PRIVATE" },
     81 	{ AUTH_MSG_SAFE,		"SAFE" },
     82 	{ AUTH_MSG_APPL_ERR,		"APPL_ERR" },
     83 	{ AUTH_MSG_DIE,			"DIE" },
     84 	{ 0,				NULL }
     85 };
     86 
     87 static const struct tok kerr2str[] = {
     88 	{ KERB_ERR_OK,			"OK" },
     89 	{ KERB_ERR_NAME_EXP,		"NAME_EXP" },
     90 	{ KERB_ERR_SERVICE_EXP,		"SERVICE_EXP" },
     91 	{ KERB_ERR_AUTH_EXP,		"AUTH_EXP" },
     92 	{ KERB_ERR_PKT_VER,		"PKT_VER" },
     93 	{ KERB_ERR_NAME_MAST_KEY_VER,	"NAME_MAST_KEY_VER" },
     94 	{ KERB_ERR_SERV_MAST_KEY_VER,	"SERV_MAST_KEY_VER" },
     95 	{ KERB_ERR_BYTE_ORDER,		"BYTE_ORDER" },
     96 	{ KERB_ERR_PRINCIPAL_UNKNOWN,	"PRINCIPAL_UNKNOWN" },
     97 	{ KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
     98 	{ KERB_ERR_NULL_KEY,		"NULL_KEY"},
     99 	{ 0,				NULL}
    100 };
    101 
    102 static const u_char *
    103 c_print(register const u_char *s, register const u_char *ep)
    104 {
    105 	register u_char c;
    106 	register int flag;
    107 
    108 	flag = 1;
    109 	while (s < ep) {
    110 		c = *s++;
    111 		if (c == '\0') {
    112 			flag = 0;
    113 			break;
    114 		}
    115 		if (!ND_ISASCII(c)) {
    116 			c = ND_TOASCII(c);
    117 			putchar('M');
    118 			putchar('-');
    119 		}
    120 		if (!ND_ISPRINT(c)) {
    121 			c ^= 0x40;	/* DEL to ?, others to alpha */
    122 			putchar('^');
    123 		}
    124 		putchar(c);
    125 	}
    126 	if (flag)
    127 		return NULL;
    128 	return (s);
    129 }
    130 
    131 static const u_char *
    132 krb4_print_hdr(const u_char *cp)
    133 {
    134 	cp += 2;
    135 
    136 #define PRINT		if ((cp = c_print(cp, snapend)) == NULL) goto trunc
    137 
    138 	PRINT;
    139 	putchar('.');
    140 	PRINT;
    141 	putchar('@');
    142 	PRINT;
    143 	return (cp);
    144 
    145 trunc:
    146 	fputs(tstr, stdout);
    147 	return (NULL);
    148 
    149 #undef PRINT
    150 }
    151 
    152 static void
    153 krb4_print(const u_char *cp)
    154 {
    155 	register const struct krb *kp;
    156 	u_char type;
    157 	u_short len;
    158 
    159 #define PRINT		if ((cp = c_print(cp, snapend)) == NULL) goto trunc
    160 /*  True if struct krb is little endian */
    161 #define IS_LENDIAN(kp)	(((kp)->type & 0x01) != 0)
    162 #define KTOHSP(kp, cp)	(IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp))
    163 
    164 	kp = (struct krb *)cp;
    165 
    166 	if ((&kp->type) >= snapend) {
    167 		fputs(tstr, stdout);
    168 		return;
    169 	}
    170 
    171 	type = kp->type & (0xFF << 1);
    172 
    173 	printf(" %s %s: ",
    174 	    IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
    175 
    176 	switch (type) {
    177 
    178 	case AUTH_MSG_KDC_REQUEST:
    179 		if ((cp = krb4_print_hdr(cp)) == NULL)
    180 			return;
    181 		cp += 4;	/* ctime */
    182 		TCHECK(*cp);
    183 		printf(" %dmin ", *cp++ * 5);
    184 		PRINT;
    185 		putchar('.');
    186 		PRINT;
    187 		break;
    188 
    189 	case AUTH_MSG_APPL_REQUEST:
    190 		cp += 2;
    191 		TCHECK(*cp);
    192 		printf("v%d ", *cp++);
    193 		PRINT;
    194 		TCHECK(*cp);
    195 		printf(" (%d)", *cp++);
    196 		TCHECK(*cp);
    197 		printf(" (%d)", *cp);
    198 		break;
    199 
    200 	case AUTH_MSG_KDC_REPLY:
    201 		if ((cp = krb4_print_hdr(cp)) == NULL)
    202 			return;
    203 		cp += 10;	/* timestamp + n + exp + kvno */
    204 		TCHECK2(*cp, sizeof(short));
    205 		len = KTOHSP(kp, cp);
    206 		printf(" (%d)", len);
    207 		break;
    208 
    209 	case AUTH_MSG_ERR_REPLY:
    210 		if ((cp = krb4_print_hdr(cp)) == NULL)
    211 			return;
    212 		cp += 4; 	  /* timestamp */
    213 		TCHECK2(*cp, sizeof(short));
    214 		printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
    215 		cp += 4;
    216 		PRINT;
    217 		break;
    218 
    219 	default:
    220 		fputs("(unknown)", stdout);
    221 		break;
    222 	}
    223 
    224 	return;
    225 trunc:
    226 	fputs(tstr, stdout);
    227 }
    228 
    229 void
    230 krb_print(const u_char *dat)
    231 {
    232 	register const struct krb *kp;
    233 
    234 	kp = (struct krb *)dat;
    235 
    236 	if (dat >= snapend) {
    237 		fputs(tstr, stdout);
    238 		return;
    239 	}
    240 
    241 	switch (kp->pvno) {
    242 
    243 	case 1:
    244 	case 2:
    245 	case 3:
    246 		printf(" v%d", kp->pvno);
    247 		break;
    248 
    249 	case 4:
    250 		printf(" v%d", kp->pvno);
    251 		krb4_print((const u_char *)kp);
    252 		break;
    253 
    254 	case 106:
    255 	case 107:
    256 		fputs(" v5", stdout);
    257 		/* Decode ASN.1 here "someday" */
    258 		break;
    259 	}
    260 	return;
    261 }
    262