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 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 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 (!isascii(c)) { 116 c = toascii(c); 117 putchar('M'); 118 putchar('-'); 119 } 120 if (!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
