The Tcpdump Group git mirrors - tcpdump/blob - print-krb.c

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