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 #ifndef lint 25 static const char rcsid[] = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-krb.c,v 1.12 1999/11/21 09:36:55 fenner Exp $"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/socket.h> 36 37 #include <netinet/in.h> 38 #include <netinet/in_systm.h> 39 #include <netinet/ip.h> 40 #include <netinet/ip_var.h> 41 #include <netinet/udp.h> 42 #include <netinet/udp_var.h> 43 44 #include <ctype.h> 45 #include <errno.h> 46 #include <stdio.h> 47 48 #include "interface.h" 49 #include "addrtoname.h" 50 51 const u_char *c_print(register const u_char *, register const u_char *); 52 const u_char *krb4_print_hdr(const u_char *); 53 void krb4_print(const u_char *); 54 void krb_print(const u_char *, u_int); 55 56 57 #define AUTH_MSG_KDC_REQUEST 1<<1 58 #define AUTH_MSG_KDC_REPLY 2<<1 59 #define AUTH_MSG_APPL_REQUEST 3<<1 60 #define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1 61 #define AUTH_MSG_ERR_REPLY 5<<1 62 #define AUTH_MSG_PRIVATE 6<<1 63 #define AUTH_MSG_SAFE 7<<1 64 #define AUTH_MSG_APPL_ERR 8<<1 65 #define AUTH_MSG_DIE 63<<1 66 67 #define KERB_ERR_OK 0 68 #define KERB_ERR_NAME_EXP 1 69 #define KERB_ERR_SERVICE_EXP 2 70 #define KERB_ERR_AUTH_EXP 3 71 #define KERB_ERR_PKT_VER 4 72 #define KERB_ERR_NAME_MAST_KEY_VER 5 73 #define KERB_ERR_SERV_MAST_KEY_VER 6 74 #define KERB_ERR_BYTE_ORDER 7 75 #define KERB_ERR_PRINCIPAL_UNKNOWN 8 76 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9 77 #define KERB_ERR_NULL_KEY 10 78 79 struct krb { 80 u_char pvno; /* Protocol Version */ 81 u_char type; /* Type+B */ 82 }; 83 84 static char tstr[] = " [|kerberos]"; 85 86 static struct tok type2str[] = { 87 { AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" }, 88 { AUTH_MSG_KDC_REPLY, "KDC_REPLY" }, 89 { AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" }, 90 { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" }, 91 { AUTH_MSG_ERR_REPLY, "ERR_REPLY" }, 92 { AUTH_MSG_PRIVATE, "PRIVATE" }, 93 { AUTH_MSG_SAFE, "SAFE" }, 94 { AUTH_MSG_APPL_ERR, "APPL_ERR" }, 95 { AUTH_MSG_DIE, "DIE" }, 96 { 0, NULL } 97 }; 98 99 static struct tok kerr2str[] = { 100 { KERB_ERR_OK, "OK" }, 101 { KERB_ERR_NAME_EXP, "NAME_EXP" }, 102 { KERB_ERR_SERVICE_EXP, "SERVICE_EXP" }, 103 { KERB_ERR_AUTH_EXP, "AUTH_EXP" }, 104 { KERB_ERR_PKT_VER, "PKT_VER" }, 105 { KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" }, 106 { KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" }, 107 { KERB_ERR_BYTE_ORDER, "BYTE_ORDER" }, 108 { KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" }, 109 { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" }, 110 { KERB_ERR_NULL_KEY, "NULL_KEY"}, 111 { 0, NULL} 112 }; 113 114 115 /* little endian (unaligned) to host byte order */ 116 /* XXX need to look at this... */ 117 #define vtohlp(x) ((( ((char *)(x))[0] ) ) | \ 118 (( ((char *)(x))[1] ) << 8) | \ 119 (( ((char *)(x))[2] ) << 16) | \ 120 (( ((char *)(x))[3] ) << 24)) 121 #define vtohsp(x) ((( ((char *)(x))[0] ) ) | \ 122 (( ((char *)(x))[1] ) << 8)) 123 /* network (big endian) (unaligned) to host byte order */ 124 #define ntohlp(x) ((( ((char *)(x))[3] ) ) | \ 125 (( ((char *)(x))[2] ) << 8) | \ 126 (( ((char *)(x))[1] ) << 16) | \ 127 (( ((char *)(x))[0] ) << 24)) 128 #define ntohsp(x) ((( ((char *)(x))[1] ) ) | \ 129 (( ((char *)(x))[0] ) << 8)) 130 131 132 133 const u_char * 134 c_print(register const u_char *s, register const u_char *ep) 135 { 136 register u_char c; 137 register int flag; 138 139 flag = 1; 140 while (s < ep) { 141 c = *s++; 142 if (c == '\0') { 143 flag = 0; 144 break; 145 } 146 if (!isascii(c)) { 147 c = toascii(c); 148 putchar('M'); 149 putchar('-'); 150 } 151 if (!isprint(c)) { 152 c ^= 0x40; /* DEL to ?, others to alpha */ 153 putchar('^'); 154 } 155 putchar(c); 156 } 157 if (flag) 158 return NULL; 159 return (s); 160 } 161 162 const u_char * 163 krb4_print_hdr(const u_char *cp) 164 { 165 cp += 2; 166 167 #define PRINT if ((cp = c_print(cp, snapend)) == NULL) goto trunc 168 169 PRINT; 170 putchar('.'); 171 PRINT; 172 putchar('@'); 173 PRINT; 174 return (cp); 175 176 trunc: 177 fputs(tstr, stdout); 178 return (NULL); 179 180 #undef PRINT 181 } 182 183 void 184 krb4_print(const u_char *cp) 185 { 186 register const struct krb *kp; 187 u_char type; 188 u_short len; 189 190 #define PRINT if ((cp = c_print(cp, snapend)) == NULL) goto trunc 191 /* True if struct krb is little endian */ 192 #define IS_LENDIAN(kp) (((kp)->type & 0x01) != 0) 193 #define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp)) 194 195 kp = (struct krb *)cp; 196 197 if ((&kp->type) >= snapend) { 198 fputs(tstr, stdout); 199 return; 200 } 201 202 type = kp->type & (0xFF << 1); 203 204 printf(" %s %s: ", 205 IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type)); 206 207 switch (type) { 208 209 case AUTH_MSG_KDC_REQUEST: 210 if ((cp = krb4_print_hdr(cp)) == NULL) 211 return; 212 cp += 4; /* ctime */ 213 TCHECK(*cp); 214 printf(" %dmin ", *cp++ * 5); 215 PRINT; 216 putchar('.'); 217 PRINT; 218 break; 219 220 case AUTH_MSG_APPL_REQUEST: 221 cp += 2; 222 TCHECK(*cp); 223 printf("v%d ", *cp++); 224 PRINT; 225 TCHECK(*cp); 226 printf(" (%d)", *cp++); 227 TCHECK(*cp); 228 printf(" (%d)", *cp); 229 break; 230 231 case AUTH_MSG_KDC_REPLY: 232 if ((cp = krb4_print_hdr(cp)) == NULL) 233 return; 234 cp += 10; /* timestamp + n + exp + kvno */ 235 TCHECK2(*cp, sizeof(short)); 236 len = KTOHSP(kp, cp); 237 printf(" (%d)", len); 238 break; 239 240 case AUTH_MSG_ERR_REPLY: 241 if ((cp = krb4_print_hdr(cp)) == NULL) 242 return; 243 cp += 4; /* timestamp */ 244 TCHECK2(*cp, sizeof(short)); 245 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp))); 246 cp += 4; 247 PRINT; 248 break; 249 250 default: 251 fputs("(unknown)", stdout); 252 break; 253 } 254 255 return; 256 trunc: 257 fputs(tstr, stdout); 258 } 259 260 void 261 krb_print(const u_char *dat, u_int length) 262 { 263 register const struct krb *kp; 264 265 kp = (struct krb *)dat; 266 267 if (dat >= snapend) { 268 fputs(tstr, stdout); 269 return; 270 } 271 272 switch (kp->pvno) { 273 274 case 1: 275 case 2: 276 case 3: 277 printf(" v%d", kp->pvno); 278 break; 279 280 case 4: 281 printf(" v%d", kp->pvno); 282 krb4_print((const u_char *)kp); 283 break; 284 285 case 106: 286 case 107: 287 fputs(" v5", stdout); 288 /* Decode ASN.1 here "someday" */ 289 break; 290 } 291 return; 292 } 293