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 /* \summary: Kerberos printer */ 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <netdissect-stdinc.h> 31 32 #include "netdissect.h" 33 #include "extract.h" 34 35 static const char tstr[] = " [|kerberos]"; 36 37 static const u_char *c_print(netdissect_options *, register const u_char *, register const u_char *); 38 static const u_char *krb4_print_hdr(netdissect_options *, const u_char *); 39 static void krb4_print(netdissect_options *, const u_char *); 40 41 #define AUTH_MSG_KDC_REQUEST 1<<1 42 #define AUTH_MSG_KDC_REPLY 2<<1 43 #define AUTH_MSG_APPL_REQUEST 3<<1 44 #define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1 45 #define AUTH_MSG_ERR_REPLY 5<<1 46 #define AUTH_MSG_PRIVATE 6<<1 47 #define AUTH_MSG_SAFE 7<<1 48 #define AUTH_MSG_APPL_ERR 8<<1 49 #define AUTH_MSG_DIE 63<<1 50 51 #define KERB_ERR_OK 0 52 #define KERB_ERR_NAME_EXP 1 53 #define KERB_ERR_SERVICE_EXP 2 54 #define KERB_ERR_AUTH_EXP 3 55 #define KERB_ERR_PKT_VER 4 56 #define KERB_ERR_NAME_MAST_KEY_VER 5 57 #define KERB_ERR_SERV_MAST_KEY_VER 6 58 #define KERB_ERR_BYTE_ORDER 7 59 #define KERB_ERR_PRINCIPAL_UNKNOWN 8 60 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9 61 #define KERB_ERR_NULL_KEY 10 62 63 struct krb { 64 uint8_t pvno; /* Protocol Version */ 65 uint8_t type; /* Type+B */ 66 }; 67 68 static const struct tok type2str[] = { 69 { AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" }, 70 { AUTH_MSG_KDC_REPLY, "KDC_REPLY" }, 71 { AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" }, 72 { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" }, 73 { AUTH_MSG_ERR_REPLY, "ERR_REPLY" }, 74 { AUTH_MSG_PRIVATE, "PRIVATE" }, 75 { AUTH_MSG_SAFE, "SAFE" }, 76 { AUTH_MSG_APPL_ERR, "APPL_ERR" }, 77 { AUTH_MSG_DIE, "DIE" }, 78 { 0, NULL } 79 }; 80 81 static const struct tok kerr2str[] = { 82 { KERB_ERR_OK, "OK" }, 83 { KERB_ERR_NAME_EXP, "NAME_EXP" }, 84 { KERB_ERR_SERVICE_EXP, "SERVICE_EXP" }, 85 { KERB_ERR_AUTH_EXP, "AUTH_EXP" }, 86 { KERB_ERR_PKT_VER, "PKT_VER" }, 87 { KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" }, 88 { KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" }, 89 { KERB_ERR_BYTE_ORDER, "BYTE_ORDER" }, 90 { KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" }, 91 { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" }, 92 { KERB_ERR_NULL_KEY, "NULL_KEY"}, 93 { 0, NULL} 94 }; 95 96 static const u_char * 97 c_print(netdissect_options *ndo, 98 register const u_char *s, register const u_char *ep) 99 { 100 register u_char c; 101 register int flag; 102 103 flag = 1; 104 while (s < ep) { 105 c = *s++; 106 if (c == '\0') { 107 flag = 0; 108 break; 109 } 110 if (!ND_ISASCII(c)) { 111 c = ND_TOASCII(c); 112 ND_PRINT((ndo, "M-")); 113 } 114 if (!ND_ISPRINT(c)) { 115 c ^= 0x40; /* DEL to ?, others to alpha */ 116 ND_PRINT((ndo, "^")); 117 } 118 ND_PRINT((ndo, "%c", c)); 119 } 120 if (flag) 121 return NULL; 122 return (s); 123 } 124 125 static const u_char * 126 krb4_print_hdr(netdissect_options *ndo, 127 const u_char *cp) 128 { 129 cp += 2; 130 131 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc 132 133 PRINT; 134 ND_PRINT((ndo, ".")); 135 PRINT; 136 ND_PRINT((ndo, "@")); 137 PRINT; 138 return (cp); 139 140 trunc: 141 ND_PRINT((ndo, "%s", tstr)); 142 return (NULL); 143 144 #undef PRINT 145 } 146 147 static void 148 krb4_print(netdissect_options *ndo, 149 const u_char *cp) 150 { 151 register const struct krb *kp; 152 u_char type; 153 u_short len; 154 155 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc 156 /* True if struct krb is little endian */ 157 #define IS_LENDIAN(kp) (((kp)->type & 0x01) != 0) 158 #define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp)) 159 160 kp = (const struct krb *)cp; 161 162 if ((&kp->type) >= ndo->ndo_snapend) { 163 ND_PRINT((ndo, "%s", tstr)); 164 return; 165 } 166 167 type = kp->type & (0xFF << 1); 168 169 ND_PRINT((ndo, " %s %s: ", 170 IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type))); 171 172 switch (type) { 173 174 case AUTH_MSG_KDC_REQUEST: 175 if ((cp = krb4_print_hdr(ndo, cp)) == NULL) 176 return; 177 cp += 4; /* ctime */ 178 ND_TCHECK(*cp); 179 ND_PRINT((ndo, " %dmin ", *cp++ * 5)); 180 PRINT; 181 ND_PRINT((ndo, ".")); 182 PRINT; 183 break; 184 185 case AUTH_MSG_APPL_REQUEST: 186 cp += 2; 187 ND_TCHECK(*cp); 188 ND_PRINT((ndo, "v%d ", *cp++)); 189 PRINT; 190 ND_TCHECK(*cp); 191 ND_PRINT((ndo, " (%d)", *cp++)); 192 ND_TCHECK(*cp); 193 ND_PRINT((ndo, " (%d)", *cp)); 194 break; 195 196 case AUTH_MSG_KDC_REPLY: 197 if ((cp = krb4_print_hdr(ndo, cp)) == NULL) 198 return; 199 cp += 10; /* timestamp + n + exp + kvno */ 200 ND_TCHECK2(*cp, sizeof(short)); 201 len = KTOHSP(kp, cp); 202 ND_PRINT((ndo, " (%d)", len)); 203 break; 204 205 case AUTH_MSG_ERR_REPLY: 206 if ((cp = krb4_print_hdr(ndo, cp)) == NULL) 207 return; 208 cp += 4; /* timestamp */ 209 ND_TCHECK2(*cp, sizeof(short)); 210 ND_PRINT((ndo, " %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)))); 211 cp += 4; 212 PRINT; 213 break; 214 215 default: 216 ND_PRINT((ndo, "(unknown)")); 217 break; 218 } 219 220 return; 221 trunc: 222 ND_PRINT((ndo, "%s", tstr)); 223 } 224 225 void 226 krb_print(netdissect_options *ndo, 227 const u_char *dat) 228 { 229 register const struct krb *kp; 230 231 kp = (const struct krb *)dat; 232 233 if (dat >= ndo->ndo_snapend) { 234 ND_PRINT((ndo, "%s", tstr)); 235 return; 236 } 237 238 switch (kp->pvno) { 239 240 case 1: 241 case 2: 242 case 3: 243 ND_PRINT((ndo, " v%d", kp->pvno)); 244 break; 245 246 case 4: 247 ND_PRINT((ndo, " v%d", kp->pvno)); 248 krb4_print(ndo, (const u_char *)kp); 249 break; 250 251 case 106: 252 case 107: 253 ND_PRINT((ndo, " v5")); 254 /* Decode ASN.1 here "someday" */ 255 break; 256 } 257 return; 258 } 259
