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 /* \summary: Kerberos printer */
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <netdissect-stdinc.h>
31
32 #include "netdissect.h"
33 #include "extract.h"
34
35 static const char tstr[] = " [|kerberos]";
36
37 static const u_char *c_print(netdissect_options *, register const u_char *, register const u_char *);
38 static const u_char *krb4_print_hdr(netdissect_options *, const u_char *);
39 static void krb4_print(netdissect_options *, const u_char *);
40
41 #define AUTH_MSG_KDC_REQUEST 1<<1
42 #define AUTH_MSG_KDC_REPLY 2<<1
43 #define AUTH_MSG_APPL_REQUEST 3<<1
44 #define AUTH_MSG_APPL_REQUEST_MUTUAL 4<<1
45 #define AUTH_MSG_ERR_REPLY 5<<1
46 #define AUTH_MSG_PRIVATE 6<<1
47 #define AUTH_MSG_SAFE 7<<1
48 #define AUTH_MSG_APPL_ERR 8<<1
49 #define AUTH_MSG_DIE 63<<1
50
51 #define KERB_ERR_OK 0
52 #define KERB_ERR_NAME_EXP 1
53 #define KERB_ERR_SERVICE_EXP 2
54 #define KERB_ERR_AUTH_EXP 3
55 #define KERB_ERR_PKT_VER 4
56 #define KERB_ERR_NAME_MAST_KEY_VER 5
57 #define KERB_ERR_SERV_MAST_KEY_VER 6
58 #define KERB_ERR_BYTE_ORDER 7
59 #define KERB_ERR_PRINCIPAL_UNKNOWN 8
60 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE 9
61 #define KERB_ERR_NULL_KEY 10
62
63 struct krb {
64 uint8_t pvno; /* Protocol Version */
65 uint8_t type; /* Type+B */
66 };
67
68 static const struct tok type2str[] = {
69 { AUTH_MSG_KDC_REQUEST, "KDC_REQUEST" },
70 { AUTH_MSG_KDC_REPLY, "KDC_REPLY" },
71 { AUTH_MSG_APPL_REQUEST, "APPL_REQUEST" },
72 { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
73 { AUTH_MSG_ERR_REPLY, "ERR_REPLY" },
74 { AUTH_MSG_PRIVATE, "PRIVATE" },
75 { AUTH_MSG_SAFE, "SAFE" },
76 { AUTH_MSG_APPL_ERR, "APPL_ERR" },
77 { AUTH_MSG_DIE, "DIE" },
78 { 0, NULL }
79 };
80
81 static const struct tok kerr2str[] = {
82 { KERB_ERR_OK, "OK" },
83 { KERB_ERR_NAME_EXP, "NAME_EXP" },
84 { KERB_ERR_SERVICE_EXP, "SERVICE_EXP" },
85 { KERB_ERR_AUTH_EXP, "AUTH_EXP" },
86 { KERB_ERR_PKT_VER, "PKT_VER" },
87 { KERB_ERR_NAME_MAST_KEY_VER, "NAME_MAST_KEY_VER" },
88 { KERB_ERR_SERV_MAST_KEY_VER, "SERV_MAST_KEY_VER" },
89 { KERB_ERR_BYTE_ORDER, "BYTE_ORDER" },
90 { KERB_ERR_PRINCIPAL_UNKNOWN, "PRINCIPAL_UNKNOWN" },
91 { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
92 { KERB_ERR_NULL_KEY, "NULL_KEY"},
93 { 0, NULL}
94 };
95
96 static const u_char *
c_print(netdissect_options * ndo,register const u_char * s,register const u_char * ep)97 c_print(netdissect_options *ndo,
98 register const u_char *s, register const u_char *ep)
99 {
100 register u_char c;
101 register int flag;
102
103 flag = 1;
104 while (s < ep) {
105 c = *s++;
106 if (c == '\0') {
107 flag = 0;
108 break;
109 }
110 if (!ND_ISASCII(c)) {
111 c = ND_TOASCII(c);
112 ND_PRINT((ndo, "M-"));
113 }
114 if (!ND_ISPRINT(c)) {
115 c ^= 0x40; /* DEL to ?, others to alpha */
116 ND_PRINT((ndo, "^"));
117 }
118 ND_PRINT((ndo, "%c", c));
119 }
120 if (flag)
121 return NULL;
122 return (s);
123 }
124
125 static const u_char *
krb4_print_hdr(netdissect_options * ndo,const u_char * cp)126 krb4_print_hdr(netdissect_options *ndo,
127 const u_char *cp)
128 {
129 cp += 2;
130
131 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
132
133 PRINT;
134 ND_PRINT((ndo, "."));
135 PRINT;
136 ND_PRINT((ndo, "@"));
137 PRINT;
138 return (cp);
139
140 trunc:
141 ND_PRINT((ndo, "%s", tstr));
142 return (NULL);
143
144 #undef PRINT
145 }
146
147 static void
krb4_print(netdissect_options * ndo,const u_char * cp)148 krb4_print(netdissect_options *ndo,
149 const u_char *cp)
150 {
151 register const struct krb *kp;
152 u_char type;
153 u_short len;
154
155 #define PRINT if ((cp = c_print(ndo, cp, ndo->ndo_snapend)) == NULL) goto trunc
156 /* True if struct krb is little endian */
157 #define IS_LENDIAN(kp) (((kp)->type & 0x01) != 0)
158 #define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp))
159
160 kp = (const struct krb *)cp;
161
162 if ((&kp->type) >= ndo->ndo_snapend) {
163 ND_PRINT((ndo, "%s", tstr));
164 return;
165 }
166
167 type = kp->type & (0xFF << 1);
168
169 ND_PRINT((ndo, " %s %s: ",
170 IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type)));
171
172 switch (type) {
173
174 case AUTH_MSG_KDC_REQUEST:
175 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
176 return;
177 cp += 4; /* ctime */
178 ND_TCHECK(*cp);
179 ND_PRINT((ndo, " %dmin ", *cp++ * 5));
180 PRINT;
181 ND_PRINT((ndo, "."));
182 PRINT;
183 break;
184
185 case AUTH_MSG_APPL_REQUEST:
186 cp += 2;
187 ND_TCHECK(*cp);
188 ND_PRINT((ndo, "v%d ", *cp++));
189 PRINT;
190 ND_TCHECK(*cp);
191 ND_PRINT((ndo, " (%d)", *cp++));
192 ND_TCHECK(*cp);
193 ND_PRINT((ndo, " (%d)", *cp));
194 break;
195
196 case AUTH_MSG_KDC_REPLY:
197 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
198 return;
199 cp += 10; /* timestamp + n + exp + kvno */
200 ND_TCHECK2(*cp, sizeof(short));
201 len = KTOHSP(kp, cp);
202 ND_PRINT((ndo, " (%d)", len));
203 break;
204
205 case AUTH_MSG_ERR_REPLY:
206 if ((cp = krb4_print_hdr(ndo, cp)) == NULL)
207 return;
208 cp += 4; /* timestamp */
209 ND_TCHECK2(*cp, sizeof(short));
210 ND_PRINT((ndo, " %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp))));
211 cp += 4;
212 PRINT;
213 break;
214
215 default:
216 ND_PRINT((ndo, "(unknown)"));
217 break;
218 }
219
220 return;
221 trunc:
222 ND_PRINT((ndo, "%s", tstr));
223 }
224
225 void
krb_print(netdissect_options * ndo,const u_char * dat)226 krb_print(netdissect_options *ndo,
227 const u_char *dat)
228 {
229 register const struct krb *kp;
230
231 kp = (const struct krb *)dat;
232
233 if (dat >= ndo->ndo_snapend) {
234 ND_PRINT((ndo, "%s", tstr));
235 return;
236 }
237
238 switch (kp->pvno) {
239
240 case 1:
241 case 2:
242 case 3:
243 ND_PRINT((ndo, " v%d", kp->pvno));
244 break;
245
246 case 4:
247 ND_PRINT((ndo, " v%d", kp->pvno));
248 krb4_print(ndo, (const u_char *)kp);
249 break;
250
251 case 106:
252 case 107:
253 ND_PRINT((ndo, " v5"));
254 /* Decode ASN.1 here "someday" */
255 break;
256 }
257 return;
258 }
259