2 * Copyright (c) 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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
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.
21 * Initial contribution from John Hawkinson (jhawk@mit.edu).
24 /* \summary: Kerberos printer */
30 #include "netdissect-stdinc.h"
32 #include "netdissect.h"
38 * Athena Technical Plan
40 * Kerberos Authentication and Authorization System
41 * by S. P. Miller, B. C. Neuman, J. I. Schiller, and J. H. Saltzer
43 * https://web.mit.edu/Saltzer/www/publications/athenaplan/e.2.1.pdf
45 * 7. Appendix I Design Specifications
49 * RFC 1510, RFC 2630, etc.
53 static const u_char *c_print(netdissect_options *, const u_char *, const u_char *);
54 static const u_char *krb4_print_hdr(netdissect_options *, const u_char *);
55 static void krb4_print(netdissect_options *, const u_char *);
57 #define AUTH_MSG_KDC_REQUEST 1<<1
58 #define AUTH_MSG_KDC_REPLY 2<<1
59 #define AUTH_MSG_APPL_REQUEST 3<<1
60 #define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1
61 #define AUTH_MSG_ERR_REPLY 5<<1
62 #define AUTH_MSG_PRIVATE 6<<1
63 #define AUTH_MSG_SAFE 7<<1
64 #define AUTH_MSG_APPL_ERR 8<<1
65 #define AUTH_MSG_DIE 63<<1
68 #define KERB_ERR_NAME_EXP 1
69 #define KERB_ERR_SERVICE_EXP 2
70 #define KERB_ERR_AUTH_EXP 3
71 #define KERB_ERR_PKT_VER 4
72 #define KERB_ERR_NAME_MAST_KEY_VER 5
73 #define KERB_ERR_SERV_MAST_KEY_VER 6
74 #define KERB_ERR_BYTE_ORDER 7
75 #define KERB_ERR_PRINCIPAL_UNKNOWN 8
76 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9
77 #define KERB_ERR_NULL_KEY 10
80 nd_uint8_t pvno; /* Protocol Version */
81 nd_uint8_t type; /* Type+B */
84 static const struct tok type2str[] = {
85 { AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" },
86 { AUTH_MSG_KDC_REPLY, "KDC_REPLY" },
87 { AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" },
88 { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
89 { AUTH_MSG_ERR_REPLY, "ERR_REPLY" },
90 { AUTH_MSG_PRIVATE, "PRIVATE" },
91 { AUTH_MSG_SAFE, "SAFE" },
92 { AUTH_MSG_APPL_ERR, "APPL_ERR" },
93 { AUTH_MSG_DIE, "DIE" },
97 static const struct tok kerr2str[] = {
98 { KERB_ERR_OK, "OK" },
99 { KERB_ERR_NAME_EXP, "NAME_EXP" },
100 { KERB_ERR_SERVICE_EXP, "SERVICE_EXP" },
101 { KERB_ERR_AUTH_EXP, "AUTH_EXP" },
102 { KERB_ERR_PKT_VER, "PKT_VER" },
103 { KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" },
104 { KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" },
105 { KERB_ERR_BYTE_ORDER, "BYTE_ORDER" },
106 { KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" },
107 { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
108 { KERB_ERR_NULL_KEY, "NULL_KEY"},
112 static const u_char *
113 c_print(netdissect_options *ndo,
114 const u_char *s, const u_char *ep)
127 fn_print_char(ndo, c);
134 static const u_char *
135 krb4_print_hdr(netdissect_options *ndo,
140 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
157 krb4_print(netdissect_options *ndo,
160 const struct krb *kp;
164 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
165 /* True if struct krb is little endian */
166 #define IS_LENDIAN(kp) ((GET_U_1((kp)->type) & 0x01) != 0)
167 #define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? GET_LE_U_2(cp) : GET_BE_U_2(cp))
169 kp = (const struct krb *)cp;
171 type = GET_U_1(kp->type) & (0xFF << 1);
174 IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
178 case AUTH_MSG_KDC_REQUEST:
179 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
182 ND_PRINT(" %umin ", GET_U_1(cp) * 5);
189 case AUTH_MSG_APPL_REQUEST:
191 ND_PRINT("v%u ", GET_U_1(cp));
194 ND_PRINT(" (%u)", GET_U_1(cp));
196 ND_PRINT(" (%u)", GET_U_1(cp));
199 case AUTH_MSG_KDC_REPLY:
200 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
202 cp += 10; /* timestamp + n + exp + kvno */
203 len = KTOHSP(kp, cp);
204 ND_PRINT(" (%u)", len);
207 case AUTH_MSG_ERR_REPLY:
208 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
210 cp += 4; /* timestamp */
211 ND_PRINT(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
217 ND_PRINT("(unknown)");
227 krb_print(netdissect_options *ndo,
230 const struct krb *kp;
232 ndo->ndo_protocol = "krb";
233 kp = (const struct krb *)dat;
235 if (dat >= ndo->ndo_snapend) {
240 switch (GET_U_1(kp->pvno)) {
245 ND_PRINT(" v%u", GET_U_1(kp->pvno));
249 ND_PRINT(" v%u", GET_U_1(kp->pvno));
250 krb4_print(ndo, (const u_char *)kp);
256 /* Decode ASN.1 here "someday" */