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 1.14 2000-09-23 08:54:34 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 #include <netinet/in_systm.h>
  39
  40 #include <ctype.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46
  47 const u_char *c_print(register const u_char *, register const u_char *);
  48 const u_char *krb4_print_hdr(const u_char *);
  49 void krb4_print(const u_char *);
  50 void krb_print(const u_char *, u_int);
  51
  52
  53 #define AUTH_MSG_KDC_REQUEST                    1<<1
  54 #define AUTH_MSG_KDC_REPLY                      2<<1
  55 #define AUTH_MSG_APPL_REQUEST                   3<<1
  56 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
  57 #define AUTH_MSG_ERR_REPLY                      5<<1
  58 #define AUTH_MSG_PRIVATE                        6<<1
  59 #define AUTH_MSG_SAFE                           7<<1
  60 #define AUTH_MSG_APPL_ERR                       8<<1
  61 #define AUTH_MSG_DIE                            63<<1
  62
  63 #define KERB_ERR_OK                             0
  64 #define KERB_ERR_NAME_EXP                       1
  65 #define KERB_ERR_SERVICE_EXP                    2
  66 #define KERB_ERR_AUTH_EXP                       3
  67 #define KERB_ERR_PKT_VER                        4
  68 #define KERB_ERR_NAME_MAST_KEY_VER              5
  69 #define KERB_ERR_SERV_MAST_KEY_VER              6
  70 #define KERB_ERR_BYTE_ORDER                     7
  71 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
  72 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
  73 #define KERB_ERR_NULL_KEY                       10
  74
  75 struct krb {
  76         u_char pvno;            /* Protocol Version */
  77         u_char type;            /* Type+B */
  78 };
  79
  80 static char tstr[] = " [|kerberos]";
  81
  82 static struct tok type2str[] = {
  83         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
  84         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
  85         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
  86         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
  87         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
  88         { AUTH_MSG_PRIVATE,             "PRIVATE" },
  89         { AUTH_MSG_SAFE,                "SAFE" },
  90         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
  91         { AUTH_MSG_DIE,                 "DIE" },
  92         { 0,                            NULL }
  93 };
  94
  95 static struct tok kerr2str[] = {
  96         { KERB_ERR_OK,                  "OK" },
  97         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
  98         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
  99         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
 100         { KERB_ERR_PKT_VER,             "PKT_VER" },
 101         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
 102         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
 103         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
 104         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
 105         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
 106         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
 107         { 0,                            NULL}
 108 };
 109
 110
 111 /* little endian (unaligned) to host byte order */
 112 /* XXX need to look at this... */
 113 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
 114                              (( ((char *)(x))[1] ) <<  8)  | \
 115                              (( ((char *)(x))[2] ) << 16)  | \
 116                              (( ((char *)(x))[3] ) << 24))
 117 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
 118                              (( ((char *)(x))[1] ) <<  8))
 119 /* network (big endian) (unaligned) to host byte order */
 120 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
 121                              (( ((char *)(x))[2] ) <<  8)  | \
 122                              (( ((char *)(x))[1] ) << 16)  | \
 123                              (( ((char *)(x))[0] ) << 24))
 124 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
 125                              (( ((char *)(x))[0] ) <<  8))
 126
 127
 128
 129 const u_char *
 130 c_print(register const u_char *s, register const u_char *ep)
 131 {
 132         register u_char c;
 133         register int flag;
 134
 135         flag = 1;
 136         while (s < ep) {
 137                 c = *s++;
 138                 if (c == '\0') {
 139                         flag = 0;
 140                         break;
 141                 }
 142                 if (!isascii(c)) {
 143                         c = toascii(c);
 144                         putchar('M');
 145                         putchar('-');
 146                 }
 147                 if (!isprint(c)) {
 148                         c ^= 0x40;      /* DEL to ?, others to alpha */
 149                         putchar('^');
 150                 }
 151                 putchar(c);
 152         }
 153         if (flag)
 154                 return NULL;
 155         return (s);
 156 }
 157
 158 const u_char *
 159 krb4_print_hdr(const u_char *cp)
 160 {
 161         cp += 2;
 162
 163 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 164
 165         PRINT;
 166         putchar('.');
 167         PRINT;
 168         putchar('@');
 169         PRINT;
 170         return (cp);
 171
 172 trunc:
 173         fputs(tstr, stdout);
 174         return (NULL);
 175
 176 #undef PRINT
 177 }
 178
 179 void
 180 krb4_print(const u_char *cp)
 181 {
 182         register const struct krb *kp;
 183         u_char type;
 184         u_short len;
 185
 186 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
 187 /*  True if struct krb is little endian */
 188 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
 189 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
 190
 191         kp = (struct krb *)cp;
 192
 193         if ((&kp->type) >= snapend) {
 194                 fputs(tstr, stdout);
 195                 return;
 196         }
 197
 198         type = kp->type & (0xFF << 1);
 199
 200         printf(" %s %s: ",
 201             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
 202
 203         switch (type) {
 204
 205         case AUTH_MSG_KDC_REQUEST:
 206                 if ((cp = krb4_print_hdr(cp)) == NULL)
 207                         return;
 208                 cp += 4;        /* ctime */
 209                 TCHECK(*cp);
 210                 printf(" %dmin ", *cp++ * 5);
 211                 PRINT;
 212                 putchar('.');
 213                 PRINT;
 214                 break;
 215
 216         case AUTH_MSG_APPL_REQUEST:
 217                 cp += 2;
 218                 TCHECK(*cp);
 219                 printf("v%d ", *cp++);
 220                 PRINT;
 221                 TCHECK(*cp);
 222                 printf(" (%d)", *cp++);
 223                 TCHECK(*cp);
 224                 printf(" (%d)", *cp);
 225                 break;
 226
 227         case AUTH_MSG_KDC_REPLY:
 228                 if ((cp = krb4_print_hdr(cp)) == NULL)
 229                         return;
 230                 cp += 10;       /* timestamp + n + exp + kvno */
 231                 TCHECK2(*cp, sizeof(short));
 232                 len = KTOHSP(kp, cp);
 233                 printf(" (%d)", len);
 234                 break;
 235
 236         case AUTH_MSG_ERR_REPLY:
 237                 if ((cp = krb4_print_hdr(cp)) == NULL)
 238                         return;
 239                 cp += 4;          /* timestamp */
 240                 TCHECK2(*cp, sizeof(short));
 241                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
 242                 cp += 4;
 243                 PRINT;
 244                 break;
 245
 246         default:
 247                 fputs("(unknown)", stdout);
 248                 break;
 249         }
 250
 251         return;
 252 trunc:
 253         fputs(tstr, stdout);
 254 }
 255
 256 void
 257 krb_print(const u_char *dat, u_int length)
 258 {
 259         register const struct krb *kp;
 260
 261         kp = (struct krb *)dat;
 262
 263         if (dat >= snapend) {
 264                 fputs(tstr, stdout);
 265                 return;
 266         }
 267
 268         switch (kp->pvno) {
 269
 270         case 1:
 271         case 2:
 272         case 3:
 273                 printf(" v%d", kp->pvno);
 274                 break;
 275
 276         case 4:
 277                 printf(" v%d", kp->pvno);
 278                 krb4_print((const u_char *)kp);
 279                 break;
 280
 281         case 106:
 282         case 107:
 283                 fputs(" v5", stdout);
 284                 /* Decode ASN.1 here "someday" */
 285                 break;
 286         }
 287         return;
 288 }