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 1.15 2000-09-29 04:58:42 guy 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
  39 #include <ctype.h>
  40 #include <errno.h>
  41 #include <stdio.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45
  46 const u_char *c_print(register const u_char *, register const u_char *);
  47 const u_char *krb4_print_hdr(const u_char *);
  48 void krb4_print(const u_char *);
  49 void krb_print(const u_char *, u_int);
  50
  51
  52 #define AUTH_MSG_KDC_REQUEST                    1<<1
  53 #define AUTH_MSG_KDC_REPLY                      2<<1
  54 #define AUTH_MSG_APPL_REQUEST                   3<<1
  55 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
  56 #define AUTH_MSG_ERR_REPLY                      5<<1
  57 #define AUTH_MSG_PRIVATE                        6<<1
  58 #define AUTH_MSG_SAFE                           7<<1
  59 #define AUTH_MSG_APPL_ERR                       8<<1
  60 #define AUTH_MSG_DIE                            63<<1
  61
  62 #define KERB_ERR_OK                             0
  63 #define KERB_ERR_NAME_EXP                       1
  64 #define KERB_ERR_SERVICE_EXP                    2
  65 #define KERB_ERR_AUTH_EXP                       3
  66 #define KERB_ERR_PKT_VER                        4
  67 #define KERB_ERR_NAME_MAST_KEY_VER              5
  68 #define KERB_ERR_SERV_MAST_KEY_VER              6
  69 #define KERB_ERR_BYTE_ORDER                     7
  70 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
  71 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
  72 #define KERB_ERR_NULL_KEY                       10
  73
  74 struct krb {
  75         u_char pvno;            /* Protocol Version */
  76         u_char type;            /* Type+B */
  77 };
  78
  79 static char tstr[] = " [|kerberos]";
  80
  81 static struct tok type2str[] = {
  82         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
  83         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
  84         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
  85         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
  86         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
  87         { AUTH_MSG_PRIVATE,             "PRIVATE" },
  88         { AUTH_MSG_SAFE,                "SAFE" },
  89         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
  90         { AUTH_MSG_DIE,                 "DIE" },
  91         { 0,                            NULL }
  92 };
  93
  94 static struct tok kerr2str[] = {
  95         { KERB_ERR_OK,                  "OK" },
  96         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
  97         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
  98         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
  99         { KERB_ERR_PKT_VER,             "PKT_VER" },
 100         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
 101         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
 102         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
 103         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
 104         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
 105         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
 106         { 0,                            NULL}
 107 };
 108
 109
 110 /* little endian (unaligned) to host byte order */
 111 /* XXX need to look at this... */
 112 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
 113                              (( ((char *)(x))[1] ) <<  8)  | \
 114                              (( ((char *)(x))[2] ) << 16)  | \
 115                              (( ((char *)(x))[3] ) << 24))
 116 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
 117                              (( ((char *)(x))[1] ) <<  8))
 118 /* network (big endian) (unaligned) to host byte order */
 119 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
 120                              (( ((char *)(x))[2] ) <<  8)  | \
 121                              (( ((char *)(x))[1] ) << 16)  | \
 122                              (( ((char *)(x))[0] ) << 24))
 123 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
 124                              (( ((char *)(x))[0] ) <<  8))
 125
 126
 127
 128 const u_char *
 129 c_print(register const u_char *s, register const u_char *ep)
 130 {
 131         register u_char c;
 132         register int flag;
 133
 134         flag = 1;
 135         while (s < ep) {
 136                 c = *s++;
 137                 if (c == '\0') {
 138                         flag = 0;
 139                         break;
 140                 }
 141                 if (!isascii(c)) {
 142                         c = toascii(c);
 143                         putchar('M');
 144                         putchar('-');
 145                 }
 146                 if (!isprint(c)) {
 147                         c ^= 0x40;      /* DEL to ?, others to alpha */
 148                         putchar('^');
 149                 }
 150                 putchar(c);
 151         }
 152         if (flag)
 153                 return NULL;
 154         return (s);
 155 }
 156
 157 const u_char *
 158 krb4_print_hdr(const u_char *cp)
 159 {
 160         cp += 2;
 161
 162 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 163
 164         PRINT;
 165         putchar('.');
 166         PRINT;
 167         putchar('@');
 168         PRINT;
 169         return (cp);
 170
 171 trunc:
 172         fputs(tstr, stdout);
 173         return (NULL);
 174
 175 #undef PRINT
 176 }
 177
 178 void
 179 krb4_print(const u_char *cp)
 180 {
 181         register const struct krb *kp;
 182         u_char type;
 183         u_short len;
 184
 185 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 186 /*  True if struct krb is little endian */
 187 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
 188 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
 189
 190         kp = (struct krb *)cp;
 191
 192         if ((&kp->type) >= snapend) {
 193                 fputs(tstr, stdout);
 194                 return;
 195         }
 196
 197         type = kp->type & (0xFF << 1);
 198
 199         printf(" %s %s: ",
 200             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
 201
 202         switch (type) {
 203
 204         case AUTH_MSG_KDC_REQUEST:
 205                 if ((cp = krb4_print_hdr(cp)) == NULL)
 206                         return;
 207                 cp += 4;        /* ctime */
 208                 TCHECK(*cp);
 209                 printf(" %dmin ", *cp++ * 5);
 210                 PRINT;
 211                 putchar('.');
 212                 PRINT;
 213                 break;
 214
 215         case AUTH_MSG_APPL_REQUEST:
 216                 cp += 2;
 217                 TCHECK(*cp);
 218                 printf("v%d ", *cp++);
 219                 PRINT;
 220                 TCHECK(*cp);
 221                 printf(" (%d)", *cp++);
 222                 TCHECK(*cp);
 223                 printf(" (%d)", *cp);
 224                 break;
 225
 226         case AUTH_MSG_KDC_REPLY:
 227                 if ((cp = krb4_print_hdr(cp)) == NULL)
 228                         return;
 229                 cp += 10;       /* timestamp + n + exp + kvno */
 230                 TCHECK2(*cp, sizeof(short));
 231                 len = KTOHSP(kp, cp);
 232                 printf(" (%d)", len);
 233                 break;
 234
 235         case AUTH_MSG_ERR_REPLY:
 236                 if ((cp = krb4_print_hdr(cp)) == NULL)
 237                         return;
 238                 cp += 4;          /* timestamp */
 239                 TCHECK2(*cp, sizeof(short));
 240                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
 241                 cp += 4;
 242                 PRINT;
 243                 break;
 244
 245         default:
 246                 fputs("(unknown)", stdout);
 247                 break;
 248         }
 249
 250         return;
 251 trunc:
 252         fputs(tstr, stdout);
 253 }
 254
 255 void
 256 krb_print(const u_char *dat, u_int length)
 257 {
 258         register const struct krb *kp;
 259
 260         kp = (struct krb *)dat;
 261
 262         if (dat >= snapend) {
 263                 fputs(tstr, stdout);
 264                 return;
 265         }
 266
 267         switch (kp->pvno) {
 268
 269         case 1:
 270         case 2:
 271         case 3:
 272                 printf(" v%d", kp->pvno);
 273                 break;
 274
 275         case 4:
 276                 printf(" v%d", kp->pvno);
 277                 krb4_print((const u_char *)kp);
 278                 break;
 279
 280         case 106:
 281         case 107:
 282                 fputs(" v5", stdout);
 283                 /* Decode ASN.1 here "someday" */
 284                 break;
 285         }
 286         return;
 287 }