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 1.18 2002-09-05 21:25:43 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 static const u_char *c_print(register const u_char *, register const u_char *);
  41 static const u_char *krb4_print_hdr(const u_char *);
  42 static void krb4_print(const u_char *);
  43
  44 #define AUTH_MSG_KDC_REQUEST                    1<<1
  45 #define AUTH_MSG_KDC_REPLY                      2<<1
  46 #define AUTH_MSG_APPL_REQUEST                   3<<1
  47 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
  48 #define AUTH_MSG_ERR_REPLY                      5<<1
  49 #define AUTH_MSG_PRIVATE                        6<<1
  50 #define AUTH_MSG_SAFE                           7<<1
  51 #define AUTH_MSG_APPL_ERR                       8<<1
  52 #define AUTH_MSG_DIE                            63<<1
  53
  54 #define KERB_ERR_OK                             0
  55 #define KERB_ERR_NAME_EXP                       1
  56 #define KERB_ERR_SERVICE_EXP                    2
  57 #define KERB_ERR_AUTH_EXP                       3
  58 #define KERB_ERR_PKT_VER                        4
  59 #define KERB_ERR_NAME_MAST_KEY_VER              5
  60 #define KERB_ERR_SERV_MAST_KEY_VER              6
  61 #define KERB_ERR_BYTE_ORDER                     7
  62 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
  63 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
  64 #define KERB_ERR_NULL_KEY                       10
  65
  66 struct krb {
  67         u_char pvno;            /* Protocol Version */
  68         u_char type;            /* Type+B */
  69 };
  70
  71 static char tstr[] = " [|kerberos]";
  72
  73 static struct tok type2str[] = {
  74         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
  75         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
  76         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
  77         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
  78         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
  79         { AUTH_MSG_PRIVATE,             "PRIVATE" },
  80         { AUTH_MSG_SAFE,                "SAFE" },
  81         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
  82         { AUTH_MSG_DIE,                 "DIE" },
  83         { 0,                            NULL }
  84 };
  85
  86 static struct tok kerr2str[] = {
  87         { KERB_ERR_OK,                  "OK" },
  88         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
  89         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
  90         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
  91         { KERB_ERR_PKT_VER,             "PKT_VER" },
  92         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
  93         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
  94         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
  95         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
  96         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
  97         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
  98         { 0,                            NULL}
  99 };
 100
 101
 102 /* little endian (unaligned) to host byte order */
 103 /* XXX need to look at this... */
 104 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
 105                              (( ((char *)(x))[1] ) <<  8)  | \
 106                              (( ((char *)(x))[2] ) << 16)  | \
 107                              (( ((char *)(x))[3] ) << 24))
 108 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
 109                              (( ((char *)(x))[1] ) <<  8))
 110 /* network (big endian) (unaligned) to host byte order */
 111 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
 112                              (( ((char *)(x))[2] ) <<  8)  | \
 113                              (( ((char *)(x))[1] ) << 16)  | \
 114                              (( ((char *)(x))[0] ) << 24))
 115 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
 116                              (( ((char *)(x))[0] ) <<  8))
 117
 118
 119
 120 static const u_char *
 121 c_print(register const u_char *s, register const u_char *ep)
 122 {
 123         register u_char c;
 124         register int flag;
 125
 126         flag = 1;
 127         while (s < ep) {
 128                 c = *s++;
 129                 if (c == '\0') {
 130                         flag = 0;
 131                         break;
 132                 }
 133                 if (!isascii(c)) {
 134                         c = toascii(c);
 135                         putchar('M');
 136                         putchar('-');
 137                 }
 138                 if (!isprint(c)) {
 139                         c ^= 0x40;      /* DEL to ?, others to alpha */
 140                         putchar('^');
 141                 }
 142                 putchar(c);
 143         }
 144         if (flag)
 145                 return NULL;
 146         return (s);
 147 }
 148
 149 static const u_char *
 150 krb4_print_hdr(const u_char *cp)
 151 {
 152         cp += 2;
 153
 154 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 155
 156         PRINT;
 157         putchar('.');
 158         PRINT;
 159         putchar('@');
 160         PRINT;
 161         return (cp);
 162
 163 trunc:
 164         fputs(tstr, stdout);
 165         return (NULL);
 166
 167 #undef PRINT
 168 }
 169
 170 static void
 171 krb4_print(const u_char *cp)
 172 {
 173         register const struct krb *kp;
 174         u_char type;
 175         u_short len;
 176
 177 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 178 /*  True if struct krb is little endian */
 179 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
 180 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
 181
 182         kp = (struct krb *)cp;
 183
 184         if ((&kp->type) >= snapend) {
 185                 fputs(tstr, stdout);
 186                 return;
 187         }
 188
 189         type = kp->type & (0xFF << 1);
 190
 191         printf(" %s %s: ",
 192             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
 193
 194         switch (type) {
 195
 196         case AUTH_MSG_KDC_REQUEST:
 197                 if ((cp = krb4_print_hdr(cp)) == NULL)
 198                         return;
 199                 cp += 4;        /* ctime */
 200                 TCHECK(*cp);
 201                 printf(" %dmin ", *cp++ * 5);
 202                 PRINT;
 203                 putchar('.');
 204                 PRINT;
 205                 break;
 206
 207         case AUTH_MSG_APPL_REQUEST:
 208                 cp += 2;
 209                 TCHECK(*cp);
 210                 printf("v%d ", *cp++);
 211                 PRINT;
 212                 TCHECK(*cp);
 213                 printf(" (%d)", *cp++);
 214                 TCHECK(*cp);
 215                 printf(" (%d)", *cp);
 216                 break;
 217
 218         case AUTH_MSG_KDC_REPLY:
 219                 if ((cp = krb4_print_hdr(cp)) == NULL)
 220                         return;
 221                 cp += 10;       /* timestamp + n + exp + kvno */
 222                 TCHECK2(*cp, sizeof(short));
 223                 len = KTOHSP(kp, cp);
 224                 printf(" (%d)", len);
 225                 break;
 226
 227         case AUTH_MSG_ERR_REPLY:
 228                 if ((cp = krb4_print_hdr(cp)) == NULL)
 229                         return;
 230                 cp += 4;          /* timestamp */
 231                 TCHECK2(*cp, sizeof(short));
 232                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
 233                 cp += 4;
 234                 PRINT;
 235                 break;
 236
 237         default:
 238                 fputs("(unknown)", stdout);
 239                 break;
 240         }
 241
 242         return;
 243 trunc:
 244         fputs(tstr, stdout);
 245 }
 246
 247 void
 248 krb_print(const u_char *dat)
 249 {
 250         register const struct krb *kp;
 251
 252         kp = (struct krb *)dat;
 253
 254         if (dat >= snapend) {
 255                 fputs(tstr, stdout);
 256                 return;
 257         }
 258
 259         switch (kp->pvno) {
 260
 261         case 1:
 262         case 2:
 263         case 3:
 264                 printf(" v%d", kp->pvno);
 265                 break;
 266
 267         case 4:
 268                 printf(" v%d", kp->pvno);
 269                 krb4_print((const u_char *)kp);
 270                 break;
 271
 272         case 106:
 273         case 107:
 274                 fputs(" v5", stdout);
 275                 /* Decode ASN.1 here "someday" */
 276                 break;
 277         }
 278         return;
 279 }