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@mit.edu). 22 */ 23 24 #include <sys/cdefs.h> 25 #ifndef lint 26 __RCSID("$NetBSD: print-krb.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 27 #endif 28 29 #define NETDISSECT_REWORKED 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <tcpdump-stdinc.h> 35 36 #include "interface.h" 37 #include "extract.h" 38 39 static const char tstr[] = " [|kerberos]"; 40 41 static const u_char *c_print(netdissect_options *, register const u_char *, register const u_char *); 42 static const u_char *krb4_print_hdr(netdissect_options *, const u_char *); 43 static void krb4_print(netdissect_options *, 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 uint8_t pvno; /* Protocol Version */ 69 uint8_t type; /* Type+B */ 70 }; 71 72 static const struct tok type2str[] = { 73 { AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" }, 74 { AUTH_MSG_KDC_REPLY, "KDC_REPLY" }, 75 { AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" }, 76 { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" }, 77 { AUTH_MSG_ERR_REPLY, "ERR_REPLY" }, 78 { AUTH_MSG_PRIVATE, "PRIVATE" }, 79 { AUTH_MSG_SAFE, "SAFE" }, 80 { AUTH_MSG_APPL_ERR, "APPL_ERR" }, 81 { AUTH_MSG_DIE, "DIE" }, 82 { 0, NULL } 83 }; 84 85 static const struct tok kerr2str[] = { 86 { KERB_ERR_OK, "OK" }, 87 { KERB_ERR_NAME_EXP, "NAME_EXP" }, 88 { KERB_ERR_SERVICE_EXP, "SERVICE_EXP" }, 89 { KERB_ERR_AUTH_EXP, "AUTH_EXP" }, 90 { KERB_ERR_PKT_VER, "PKT_VER" }, 91 { KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" }, 92 { KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" }, 93 { KERB_ERR_BYTE_ORDER, "BYTE_ORDER" }, 94 { KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" }, 95 { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" }, 96 { KERB_ERR_NULL_KEY, "NULL_KEY"}, 97 { 0, NULL} 98 }; 99 100 static const u_char * 101 c_print(netdissect_options *ndo, 102 register const u_char *s, register const u_char *ep) 103 { 104 register u_char c; 105 register int flag; 106 107 flag = 1; 108 while (s < ep) { 109 c = *s++; 110 if (c == '\0') { 111 flag = 0; 112 break; 113 } 114 if (!ND_ISASCII(c)) { 115 c = ND_TOASCII(c); 116 ND_PRINT((ndo, "M-")); 117 } 118 if (!ND_ISPRINT(c)) { 119 c ^= 0x40; /* DEL to ?, others to alpha */ 120 ND_PRINT((ndo, "^")); 121 } 122 ND_PRINT((ndo, "%c", c)); 123 } 124 if (flag) 125 return NULL; 126 return (s); 127 } 128 129 static const u_char * 130 krb4_print_hdr(netdissect_options *ndo, 131 const u_char *cp) 132 { 133 cp += 2; 134 135 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc 136 137 PRINT; 138 ND_PRINT((ndo, ".")); 139 PRINT; 140 ND_PRINT((ndo, "@")); 141 PRINT; 142 return (cp); 143 144 trunc: 145 ND_PRINT((ndo, "%s", tstr)); 146 return (NULL); 147 148 #undef PRINT 149 } 150 151 static void 152 krb4_print(netdissect_options *ndo, 153 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(ndo, cp, ndo->ndo_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) >= ndo->ndo_snapend) { 167 ND_PRINT((ndo, "%s", tstr)); 168 return; 169 } 170 171 type = kp->type & (0xFF << 1); 172 173 ND_PRINT((ndo, " %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(ndo, cp)) == NULL) 180 return; 181 cp += 4; /* ctime */ 182 ND_TCHECK(*cp); 183 ND_PRINT((ndo, " %dmin ", *cp++ * 5)); 184 PRINT; 185 ND_PRINT((ndo, ".")); 186 PRINT; 187 break; 188 189 case AUTH_MSG_APPL_REQUEST: 190 cp += 2; 191 ND_TCHECK(*cp); 192 ND_PRINT((ndo, "v%d ", *cp++)); 193 PRINT; 194 ND_TCHECK(*cp); 195 ND_PRINT((ndo, " (%d)", *cp++)); 196 ND_TCHECK(*cp); 197 ND_PRINT((ndo, " (%d)", *cp)); 198 break; 199 200 case AUTH_MSG_KDC_REPLY: 201 if ((cp = krb4_print_hdr(ndo, cp)) == NULL) 202 return; 203 cp += 10; /* timestamp + n + exp + kvno */ 204 ND_TCHECK2(*cp, sizeof(short)); 205 len = KTOHSP(kp, cp); 206 ND_PRINT((ndo, " (%d)", len)); 207 break; 208 209 case AUTH_MSG_ERR_REPLY: 210 if ((cp = krb4_print_hdr(ndo, cp)) == NULL) 211 return; 212 cp += 4; /* timestamp */ 213 ND_TCHECK2(*cp, sizeof(short)); 214 ND_PRINT((ndo, " %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)))); 215 cp += 4; 216 PRINT; 217 break; 218 219 default: 220 ND_PRINT((ndo, "(unknown)")); 221 break; 222 } 223 224 return; 225 trunc: 226 ND_PRINT((ndo, "%s", tstr)); 227 } 228 229 void 230 krb_print(netdissect_options *ndo, 231 const u_char *dat) 232 { 233 register const struct krb *kp; 234 235 kp = (struct krb *)dat; 236 237 if (dat >= ndo->ndo_snapend) { 238 ND_PRINT((ndo, "%s", tstr)); 239 return; 240 } 241 242 switch (kp->pvno) { 243 244 case 1: 245 case 2: 246 case 3: 247 ND_PRINT((ndo, " v%d", kp->pvno)); 248 break; 249 250 case 4: 251 ND_PRINT((ndo, " v%d", kp->pvno)); 252 krb4_print(ndo, (const u_char *)kp); 253 break; 254 255 case 106: 256 case 107: 257 ND_PRINT((ndo, " v5")); 258 /* Decode ASN.1 here "someday" */ 259 break; 260 } 261 return; 262 } 263