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 1.16 2002-08-01 08:53:14 risso Exp $";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <errno.h>
  36 #include <stdio.h>
  37
  38 #include "interface.h"
  39 #include "addrtoname.h"
  40
  41 const u_char *c_print(register const u_char *, register const u_char *);
  42 const u_char *krb4_print_hdr(const u_char *);
  43 void krb4_print(const u_char *);
  44 void krb_print(const u_char *, u_int);
  45
  46
  47 #define AUTH_MSG_KDC_REQUEST                    1<<1
  48 #define AUTH_MSG_KDC_REPLY                      2<<1
  49 #define AUTH_MSG_APPL_REQUEST                   3<<1
  50 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
  51 #define AUTH_MSG_ERR_REPLY                      5<<1
  52 #define AUTH_MSG_PRIVATE                        6<<1
  53 #define AUTH_MSG_SAFE                           7<<1
  54 #define AUTH_MSG_APPL_ERR                       8<<1
  55 #define AUTH_MSG_DIE                            63<<1
  56
  57 #define KERB_ERR_OK                             0
  58 #define KERB_ERR_NAME_EXP                       1
  59 #define KERB_ERR_SERVICE_EXP                    2
  60 #define KERB_ERR_AUTH_EXP                       3
  61 #define KERB_ERR_PKT_VER                        4
  62 #define KERB_ERR_NAME_MAST_KEY_VER              5
  63 #define KERB_ERR_SERV_MAST_KEY_VER              6
  64 #define KERB_ERR_BYTE_ORDER                     7
  65 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
  66 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
  67 #define KERB_ERR_NULL_KEY                       10
  68
  69 struct krb {
  70         u_char pvno;            /* Protocol Version */
  71         u_char type;            /* Type+B */
  72 };
  73
  74 static char tstr[] = " [|kerberos]";
  75
  76 static struct tok type2str[] = {
  77         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
  78         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
  79         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
  80         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
  81         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
  82         { AUTH_MSG_PRIVATE,             "PRIVATE" },
  83         { AUTH_MSG_SAFE,                "SAFE" },
  84         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
  85         { AUTH_MSG_DIE,                 "DIE" },
  86         { 0,                            NULL }
  87 };
  88
  89 static struct tok kerr2str[] = {
  90         { KERB_ERR_OK,                  "OK" },
  91         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
  92         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
  93         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
  94         { KERB_ERR_PKT_VER,             "PKT_VER" },
  95         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
  96         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
  97         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
  98         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
  99         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
 100         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
 101         { 0,                            NULL}
 102 };
 103
 104
 105 /* little endian (unaligned) to host byte order */
 106 /* XXX need to look at this... */
 107 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
 108                              (( ((char *)(x))[1] ) <<  8)  | \
 109                              (( ((char *)(x))[2] ) << 16)  | \
 110                              (( ((char *)(x))[3] ) << 24))
 111 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
 112                              (( ((char *)(x))[1] ) <<  8))
 113 /* network (big endian) (unaligned) to host byte order */
 114 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
 115                              (( ((char *)(x))[2] ) <<  8)  | \
 116                              (( ((char *)(x))[1] ) << 16)  | \
 117                              (( ((char *)(x))[0] ) << 24))
 118 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
 119                              (( ((char *)(x))[0] ) <<  8))
 120
 121
 122
 123 const u_char *
 124 c_print(register const u_char *s, register const u_char *ep)
 125 {
 126         register u_char c;
 127         register int flag;
 128
 129         flag = 1;
 130         while (s < ep) {
 131                 c = *s++;
 132                 if (c == '\0') {
 133                         flag = 0;
 134                         break;
 135                 }
 136                 if (!isascii(c)) {
 137                         c = toascii(c);
 138                         putchar('M');
 139                         putchar('-');
 140                 }
 141                 if (!isprint(c)) {
 142                         c ^= 0x40;      /* DEL to ?, others to alpha */
 143                         putchar('^');
 144                 }
 145                 putchar(c);
 146         }
 147         if (flag)
 148                 return NULL;
 149         return (s);
 150 }
 151
 152 const u_char *
 153 krb4_print_hdr(const u_char *cp)
 154 {
 155         cp += 2;
 156
 157 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 158
 159         PRINT;
 160         putchar('.');
 161         PRINT;
 162         putchar('@');
 163         PRINT;
 164         return (cp);
 165
 166 trunc:
 167         fputs(tstr, stdout);
 168         return (NULL);
 169
 170 #undef PRINT
 171 }
 172
 173 void
 174 krb4_print(const u_char *cp)
 175 {
 176         register const struct krb *kp;
 177         u_char type;
 178         u_short len;
 179
 180 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 181 /*  True if struct krb is little endian */
 182 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
 183 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
 184
 185         kp = (struct krb *)cp;
 186
 187         if ((&kp->type) >= snapend) {
 188                 fputs(tstr, stdout);
 189                 return;
 190         }
 191
 192         type = kp->type & (0xFF << 1);
 193
 194         printf(" %s %s: ",
 195             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
 196
 197         switch (type) {
 198
 199         case AUTH_MSG_KDC_REQUEST:
 200                 if ((cp = krb4_print_hdr(cp)) == NULL)
 201                         return;
 202                 cp += 4;        /* ctime */
 203                 TCHECK(*cp);
 204                 printf(" %dmin ", *cp++ * 5);
 205                 PRINT;
 206                 putchar('.');
 207                 PRINT;
 208                 break;
 209
 210         case AUTH_MSG_APPL_REQUEST:
 211                 cp += 2;
 212                 TCHECK(*cp);
 213                 printf("v%d ", *cp++);
 214                 PRINT;
 215                 TCHECK(*cp);
 216                 printf(" (%d)", *cp++);
 217                 TCHECK(*cp);
 218                 printf(" (%d)", *cp);
 219                 break;
 220
 221         case AUTH_MSG_KDC_REPLY:
 222                 if ((cp = krb4_print_hdr(cp)) == NULL)
 223                         return;
 224                 cp += 10;       /* timestamp + n + exp + kvno */
 225                 TCHECK2(*cp, sizeof(short));
 226                 len = KTOHSP(kp, cp);
 227                 printf(" (%d)", len);
 228                 break;
 229
 230         case AUTH_MSG_ERR_REPLY:
 231                 if ((cp = krb4_print_hdr(cp)) == NULL)
 232                         return;
 233                 cp += 4;          /* timestamp */
 234                 TCHECK2(*cp, sizeof(short));
 235                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
 236                 cp += 4;
 237                 PRINT;
 238                 break;
 239
 240         default:
 241                 fputs("(unknown)", stdout);
 242                 break;
 243         }
 244
 245         return;
 246 trunc:
 247         fputs(tstr, stdout);
 248 }
 249
 250 void
 251 krb_print(const u_char *dat, u_int length)
 252 {
 253         register const struct krb *kp;
 254
 255         kp = (struct krb *)dat;
 256
 257         if (dat >= snapend) {
 258                 fputs(tstr, stdout);
 259                 return;
 260         }
 261
 262         switch (kp->pvno) {
 263
 264         case 1:
 265         case 2:
 266         case 3:
 267                 printf(" v%d", kp->pvno);
 268                 break;
 269
 270         case 4:
 271                 printf(" v%d", kp->pvno);
 272                 krb4_print((const u_char *)kp);
 273                 break;
 274
 275         case 106:
 276         case 107:
 277                 fputs(" v5", stdout);
 278                 /* Decode ASN.1 here "someday" */
 279                 break;
 280         }
 281         return;
 282 }