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 #ifndef lint
  25 static const char rcsid[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-krb.c,v 1.17 2002-08-06 04:42:05 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
  40 const u_char *c_print(register const u_char *, register const u_char *);
  41 const u_char *krb4_print_hdr(const u_char *);
  42 void krb4_print(const u_char *);
  43 void krb_print(const u_char *, u_int);
  44
  45
  46 #define AUTH_MSG_KDC_REQUEST                    1<<1
  47 #define AUTH_MSG_KDC_REPLY                      2<<1
  48 #define AUTH_MSG_APPL_REQUEST                   3<<1
  49 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
  50 #define AUTH_MSG_ERR_REPLY                      5<<1
  51 #define AUTH_MSG_PRIVATE                        6<<1
  52 #define AUTH_MSG_SAFE                           7<<1
  53 #define AUTH_MSG_APPL_ERR                       8<<1
  54 #define AUTH_MSG_DIE                            63<<1
  55
  56 #define KERB_ERR_OK                             0
  57 #define KERB_ERR_NAME_EXP                       1
  58 #define KERB_ERR_SERVICE_EXP                    2
  59 #define KERB_ERR_AUTH_EXP                       3
  60 #define KERB_ERR_PKT_VER                        4
  61 #define KERB_ERR_NAME_MAST_KEY_VER              5
  62 #define KERB_ERR_SERV_MAST_KEY_VER              6
  63 #define KERB_ERR_BYTE_ORDER                     7
  64 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
  65 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
  66 #define KERB_ERR_NULL_KEY                       10
  67
  68 struct krb {
  69         u_char pvno;            /* Protocol Version */
  70         u_char type;            /* Type+B */
  71 };
  72
  73 static char tstr[] = " [|kerberos]";
  74
  75 static struct tok type2str[] = {
  76         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
  77         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
  78         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
  79         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
  80         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
  81         { AUTH_MSG_PRIVATE,             "PRIVATE" },
  82         { AUTH_MSG_SAFE,                "SAFE" },
  83         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
  84         { AUTH_MSG_DIE,                 "DIE" },
  85         { 0,                            NULL }
  86 };
  87
  88 static struct tok kerr2str[] = {
  89         { KERB_ERR_OK,                  "OK" },
  90         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
  91         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
  92         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
  93         { KERB_ERR_PKT_VER,             "PKT_VER" },
  94         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
  95         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
  96         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
  97         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
  98         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
  99         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
 100         { 0,                            NULL}
 101 };
 102
 103
 104 /* little endian (unaligned) to host byte order */
 105 /* XXX need to look at this... */
 106 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
 107                              (( ((char *)(x))[1] ) <<  8)  | \
 108                              (( ((char *)(x))[2] ) << 16)  | \
 109                              (( ((char *)(x))[3] ) << 24))
 110 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
 111                              (( ((char *)(x))[1] ) <<  8))
 112 /* network (big endian) (unaligned) to host byte order */
 113 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
 114                              (( ((char *)(x))[2] ) <<  8)  | \
 115                              (( ((char *)(x))[1] ) << 16)  | \
 116                              (( ((char *)(x))[0] ) << 24))
 117 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
 118                              (( ((char *)(x))[0] ) <<  8))
 119
 120
 121
 122 const u_char *
 123 c_print(register const u_char *s, register const u_char *ep)
 124 {
 125         register u_char c;
 126         register int flag;
 127
 128         flag = 1;
 129         while (s < ep) {
 130                 c = *s++;
 131                 if (c == '\0') {
 132                         flag = 0;
 133                         break;
 134                 }
 135                 if (!isascii(c)) {
 136                         c = toascii(c);
 137                         putchar('M');
 138                         putchar('-');
 139                 }
 140                 if (!isprint(c)) {
 141                         c ^= 0x40;      /* DEL to ?, others to alpha */
 142                         putchar('^');
 143                 }
 144                 putchar(c);
 145         }
 146         if (flag)
 147                 return NULL;
 148         return (s);
 149 }
 150
 151 const u_char *
 152 krb4_print_hdr(const u_char *cp)
 153 {
 154         cp += 2;
 155
 156 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 157
 158         PRINT;
 159         putchar('.');
 160         PRINT;
 161         putchar('@');
 162         PRINT;
 163         return (cp);
 164
 165 trunc:
 166         fputs(tstr, stdout);
 167         return (NULL);
 168
 169 #undef PRINT
 170 }
 171
 172 void
 173 krb4_print(const u_char *cp)
 174 {
 175         register const struct krb *kp;
 176         u_char type;
 177         u_short len;
 178
 179 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 180 /*  True if struct krb is little endian */
 181 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
 182 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
 183
 184         kp = (struct krb *)cp;
 185
 186         if ((&kp->type) >= snapend) {
 187                 fputs(tstr, stdout);
 188                 return;
 189         }
 190
 191         type = kp->type & (0xFF << 1);
 192
 193         printf(" %s %s: ",
 194             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
 195
 196         switch (type) {
 197
 198         case AUTH_MSG_KDC_REQUEST:
 199                 if ((cp = krb4_print_hdr(cp)) == NULL)
 200                         return;
 201                 cp += 4;        /* ctime */
 202                 TCHECK(*cp);
 203                 printf(" %dmin ", *cp++ * 5);
 204                 PRINT;
 205                 putchar('.');
 206                 PRINT;
 207                 break;
 208
 209         case AUTH_MSG_APPL_REQUEST:
 210                 cp += 2;
 211                 TCHECK(*cp);
 212                 printf("v%d ", *cp++);
 213                 PRINT;
 214                 TCHECK(*cp);
 215                 printf(" (%d)", *cp++);
 216                 TCHECK(*cp);
 217                 printf(" (%d)", *cp);
 218                 break;
 219
 220         case AUTH_MSG_KDC_REPLY:
 221                 if ((cp = krb4_print_hdr(cp)) == NULL)
 222                         return;
 223                 cp += 10;       /* timestamp + n + exp + kvno */
 224                 TCHECK2(*cp, sizeof(short));
 225                 len = KTOHSP(kp, cp);
 226                 printf(" (%d)", len);
 227                 break;
 228
 229         case AUTH_MSG_ERR_REPLY:
 230                 if ((cp = krb4_print_hdr(cp)) == NULL)
 231                         return;
 232                 cp += 4;          /* timestamp */
 233                 TCHECK2(*cp, sizeof(short));
 234                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
 235                 cp += 4;
 236                 PRINT;
 237                 break;
 238
 239         default:
 240                 fputs("(unknown)", stdout);
 241                 break;
 242         }
 243
 244         return;
 245 trunc:
 246         fputs(tstr, stdout);
 247 }
 248
 249 void
 250 krb_print(const u_char *dat, u_int length)
 251 {
 252         register const struct krb *kp;
 253
 254         kp = (struct krb *)dat;
 255
 256         if (dat >= snapend) {
 257                 fputs(tstr, stdout);
 258                 return;
 259         }
 260
 261         switch (kp->pvno) {
 262
 263         case 1:
 264         case 2:
 265         case 3:
 266                 printf(" v%d", kp->pvno);
 267                 break;
 268
 269         case 4:
 270                 printf(" v%d", kp->pvno);
 271                 krb4_print((const u_char *)kp);
 272                 break;
 273
 274         case 106:
 275         case 107:
 276                 fputs(" v5", stdout);
 277                 /* Decode ASN.1 here "someday" */
 278                 break;
 279         }
 280         return;
 281 }