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lijia
256
print-krb.c
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256
print-krb.c
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/*
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* Copyright (c) 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Initial contribution from John Hawkinson (jhawk@mit.edu).
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "extract.h"
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static const char tstr[] = " [|kerberos]";
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static const u_char *c_print(netdissect_options *, register const u_char *, register const u_char *);
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static const u_char *krb4_print_hdr(netdissect_options *, const u_char *);
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static void krb4_print(netdissect_options *, const u_char *);
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#define AUTH_MSG_KDC_REQUEST 1<<1
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#define AUTH_MSG_KDC_REPLY 2<<1
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#define AUTH_MSG_APPL_REQUEST 3<<1
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#define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1
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#define AUTH_MSG_ERR_REPLY 5<<1
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#define AUTH_MSG_PRIVATE 6<<1
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#define AUTH_MSG_SAFE 7<<1
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#define AUTH_MSG_APPL_ERR 8<<1
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#define AUTH_MSG_DIE 63<<1
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#define KERB_ERR_OK 0
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#define KERB_ERR_NAME_EXP 1
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#define KERB_ERR_SERVICE_EXP 2
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#define KERB_ERR_AUTH_EXP 3
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#define KERB_ERR_PKT_VER 4
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#define KERB_ERR_NAME_MAST_KEY_VER 5
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#define KERB_ERR_SERV_MAST_KEY_VER 6
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#define KERB_ERR_BYTE_ORDER 7
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#define KERB_ERR_PRINCIPAL_UNKNOWN 8
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#define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9
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#define KERB_ERR_NULL_KEY 10
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struct krb {
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uint8_t pvno; /* Protocol Version */
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uint8_t type; /* Type+B */
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};
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static const struct tok type2str[] = {
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{ AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" },
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{ AUTH_MSG_KDC_REPLY, "KDC_REPLY" },
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{ AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" },
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{ AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
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{ AUTH_MSG_ERR_REPLY, "ERR_REPLY" },
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{ AUTH_MSG_PRIVATE, "PRIVATE" },
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{ AUTH_MSG_SAFE, "SAFE" },
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{ AUTH_MSG_APPL_ERR, "APPL_ERR" },
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{ AUTH_MSG_DIE, "DIE" },
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{ 0, NULL }
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};
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static const struct tok kerr2str[] = {
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{ KERB_ERR_OK, "OK" },
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{ KERB_ERR_NAME_EXP, "NAME_EXP" },
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{ KERB_ERR_SERVICE_EXP, "SERVICE_EXP" },
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{ KERB_ERR_AUTH_EXP, "AUTH_EXP" },
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{ KERB_ERR_PKT_VER, "PKT_VER" },
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{ KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" },
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{ KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" },
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{ KERB_ERR_BYTE_ORDER, "BYTE_ORDER" },
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{ KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" },
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{ KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
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{ KERB_ERR_NULL_KEY, "NULL_KEY"},
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{ 0, NULL}
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};
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static const u_char *
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c_print(netdissect_options *ndo,
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register const u_char *s, register const u_char *ep)
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{
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register u_char c;
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register int flag;
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flag = 1;
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while (s < ep) {
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c = *s++;
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if (c == '\0') {
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flag = 0;
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break;
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}
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if (!ND_ISASCII(c)) {
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c = ND_TOASCII(c);
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ND_PRINT((ndo, "M-"));
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}
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if (!ND_ISPRINT(c)) {
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c ^= 0x40; /* DEL to ?, others to alpha */
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ND_PRINT((ndo, "^"));
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}
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ND_PRINT((ndo, "%c", c));
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}
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if (flag)
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return NULL;
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return (s);
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}
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static const u_char *
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krb4_print_hdr(netdissect_options *ndo,
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const u_char *cp)
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{
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cp += 2;
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#define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
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PRINT;
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ND_PRINT((ndo, "."));
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PRINT;
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ND_PRINT((ndo, "@"));
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PRINT;
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return (cp);
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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return (NULL);
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#undef PRINT
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}
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static void
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krb4_print(netdissect_options *ndo,
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const u_char *cp)
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{
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register const struct krb *kp;
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u_char type;
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u_short len;
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#define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
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/* True if struct krb is little endian */
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#define IS_LENDIAN(kp) (((kp)->type & 0x01) != 0)
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#define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp))
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kp = (const struct krb *)cp;
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if ((&kp->type) >= ndo->ndo_snapend) {
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ND_PRINT((ndo, "%s", tstr));
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return;
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}
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type = kp->type & (0xFF << 1);
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ND_PRINT((ndo, " %s %s: ",
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IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type)));
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switch (type) {
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case AUTH_MSG_KDC_REQUEST:
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if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
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return;
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cp += 4; /* ctime */
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ND_TCHECK(*cp);
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ND_PRINT((ndo, " %dmin ", *cp++ * 5));
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PRINT;
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ND_PRINT((ndo, "."));
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PRINT;
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break;
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case AUTH_MSG_APPL_REQUEST:
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cp += 2;
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ND_TCHECK(*cp);
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ND_PRINT((ndo, "v%d ", *cp++));
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PRINT;
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ND_TCHECK(*cp);
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ND_PRINT((ndo, " (%d)", *cp++));
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ND_TCHECK(*cp);
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ND_PRINT((ndo, " (%d)", *cp));
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break;
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case AUTH_MSG_KDC_REPLY:
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if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
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return;
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cp += 10; /* timestamp + n + exp + kvno */
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ND_TCHECK2(*cp, sizeof(short));
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len = KTOHSP(kp, cp);
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ND_PRINT((ndo, " (%d)", len));
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break;
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case AUTH_MSG_ERR_REPLY:
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if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
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return;
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cp += 4; /* timestamp */
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ND_TCHECK2(*cp, sizeof(short));
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ND_PRINT((ndo, " %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp))));
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cp += 4;
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PRINT;
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break;
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default:
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ND_PRINT((ndo, "(unknown)"));
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break;
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}
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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void
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krb_print(netdissect_options *ndo,
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const u_char *dat)
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{
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register const struct krb *kp;
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kp = (const struct krb *)dat;
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if (dat >= ndo->ndo_snapend) {
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ND_PRINT((ndo, "%s", tstr));
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return;
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}
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switch (kp->pvno) {
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case 1:
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case 2:
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case 3:
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ND_PRINT((ndo, " v%d", kp->pvno));
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break;
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case 4:
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ND_PRINT((ndo, " v%d", kp->pvno));
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krb4_print(ndo, (const u_char *)kp);
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break;
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case 106:
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case 107:
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ND_PRINT((ndo, " v5"));
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/* Decode ASN.1 here "someday" */
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break;
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}
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return;
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}
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