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[FreeBSD/FreeBSD.git] / contrib / tcpdump / 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 1.15 2000/09/29 04:58:42 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
39 #include <ctype.h>
40 #include <errno.h>
41 #include <stdio.h>
42
43 #include "interface.h"
44 #include "addrtoname.h"
45
46 const u_char *c_print(register const u_char *, register const u_char *);
47 const u_char *krb4_print_hdr(const u_char *);
48 void krb4_print(const u_char *);
49 void krb_print(const u_char *, u_int);
50
51
52 #define AUTH_MSG_KDC_REQUEST                    1<<1
53 #define AUTH_MSG_KDC_REPLY                      2<<1
54 #define AUTH_MSG_APPL_REQUEST                   3<<1
55 #define AUTH_MSG_APPL_REQUEST_MUTUAL            4<<1
56 #define AUTH_MSG_ERR_REPLY                      5<<1
57 #define AUTH_MSG_PRIVATE                        6<<1
58 #define AUTH_MSG_SAFE                           7<<1
59 #define AUTH_MSG_APPL_ERR                       8<<1
60 #define AUTH_MSG_DIE                            63<<1
61
62 #define KERB_ERR_OK                             0
63 #define KERB_ERR_NAME_EXP                       1
64 #define KERB_ERR_SERVICE_EXP                    2
65 #define KERB_ERR_AUTH_EXP                       3
66 #define KERB_ERR_PKT_VER                        4
67 #define KERB_ERR_NAME_MAST_KEY_VER              5
68 #define KERB_ERR_SERV_MAST_KEY_VER              6
69 #define KERB_ERR_BYTE_ORDER                     7
70 #define KERB_ERR_PRINCIPAL_UNKNOWN              8
71 #define KERB_ERR_PRINCIPAL_NOT_UNIQUE           9
72 #define KERB_ERR_NULL_KEY                       10
73
74 struct krb {
75         u_char pvno;            /* Protocol Version */
76         u_char type;            /* Type+B */
77 };
78
79 static char tstr[] = " [|kerberos]";
80
81 static struct tok type2str[] = {
82         { AUTH_MSG_KDC_REQUEST,         "KDC_REQUEST" },
83         { AUTH_MSG_KDC_REPLY,           "KDC_REPLY" },
84         { AUTH_MSG_APPL_REQUEST,        "APPL_REQUEST" },
85         { AUTH_MSG_APPL_REQUEST_MUTUAL, "APPL_REQUEST_MUTUAL" },
86         { AUTH_MSG_ERR_REPLY,           "ERR_REPLY" },
87         { AUTH_MSG_PRIVATE,             "PRIVATE" },
88         { AUTH_MSG_SAFE,                "SAFE" },
89         { AUTH_MSG_APPL_ERR,            "APPL_ERR" },
90         { AUTH_MSG_DIE,                 "DIE" },
91         { 0,                            NULL }
92 };
93
94 static struct tok kerr2str[] = {
95         { KERB_ERR_OK,                  "OK" },
96         { KERB_ERR_NAME_EXP,            "NAME_EXP" },
97         { KERB_ERR_SERVICE_EXP,         "SERVICE_EXP" },
98         { KERB_ERR_AUTH_EXP,            "AUTH_EXP" },
99         { KERB_ERR_PKT_VER,             "PKT_VER" },
100         { KERB_ERR_NAME_MAST_KEY_VER,   "NAME_MAST_KEY_VER" },
101         { KERB_ERR_SERV_MAST_KEY_VER,   "SERV_MAST_KEY_VER" },
102         { KERB_ERR_BYTE_ORDER,          "BYTE_ORDER" },
103         { KERB_ERR_PRINCIPAL_UNKNOWN,   "PRINCIPAL_UNKNOWN" },
104         { KERB_ERR_PRINCIPAL_NOT_UNIQUE,"PRINCIPAL_NOT_UNIQUE" },
105         { KERB_ERR_NULL_KEY,            "NULL_KEY"},
106         { 0,                            NULL}
107 };
108
109
110 /* little endian (unaligned) to host byte order */
111 /* XXX need to look at this... */
112 #define vtohlp(x)           ((( ((char *)(x))[0] )      )  | \
113                              (( ((char *)(x))[1] ) <<  8)  | \
114                              (( ((char *)(x))[2] ) << 16)  | \
115                              (( ((char *)(x))[3] ) << 24))
116 #define vtohsp(x)          ((( ((char *)(x))[0] )      )  | \
117                              (( ((char *)(x))[1] ) <<  8))
118 /* network (big endian) (unaligned) to host byte order */
119 #define ntohlp(x)           ((( ((char *)(x))[3] )      )  | \
120                              (( ((char *)(x))[2] ) <<  8)  | \
121                              (( ((char *)(x))[1] ) << 16)  | \
122                              (( ((char *)(x))[0] ) << 24))
123 #define ntohsp(x)          ((( ((char *)(x))[1] )      )  | \
124                              (( ((char *)(x))[0] ) <<  8))
125
126
127
128 const u_char *
129 c_print(register const u_char *s, register const u_char *ep)
130 {
131         register u_char c;
132         register int flag;
133
134         flag = 1;
135         while (s < ep) {
136                 c = *s++;
137                 if (c == '\0') {
138                         flag = 0;
139                         break;
140                 }
141                 if (!isascii(c)) {
142                         c = toascii(c);
143                         putchar('M');
144                         putchar('-');
145                 }
146                 if (!isprint(c)) {
147                         c ^= 0x40;      /* DEL to ?, others to alpha */
148                         putchar('^');
149                 }
150                 putchar(c);
151         }
152         if (flag)
153                 return NULL;
154         return (s);
155 }
156
157 const u_char *
158 krb4_print_hdr(const u_char *cp)
159 {
160         cp += 2;
161
162 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
163
164         PRINT;
165         putchar('.');
166         PRINT;
167         putchar('@');
168         PRINT;
169         return (cp);
170
171 trunc:
172         fputs(tstr, stdout);
173         return (NULL);
174
175 #undef PRINT
176 }
177
178 void
179 krb4_print(const u_char *cp)
180 {
181         register const struct krb *kp;
182         u_char type;
183         u_short len;
184
185 #define PRINT           if ((cp = c_print(cp, snapend)) == NULL) goto trunc
186 /*  True if struct krb is little endian */
187 #define IS_LENDIAN(kp)  (((kp)->type & 0x01) != 0)
188 #define KTOHSP(kp, cp)  (IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
189
190         kp = (struct krb *)cp;
191
192         if ((&kp->type) >= snapend) {
193                 fputs(tstr, stdout);
194                 return;
195         }
196
197         type = kp->type & (0xFF << 1);
198
199         printf(" %s %s: ",
200             IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
201
202         switch (type) {
203
204         case AUTH_MSG_KDC_REQUEST:
205                 if ((cp = krb4_print_hdr(cp)) == NULL)
206                         return;
207                 cp += 4;        /* ctime */
208                 TCHECK(*cp);
209                 printf(" %dmin ", *cp++ * 5);
210                 PRINT;
211                 putchar('.');
212                 PRINT;
213                 break;
214
215         case AUTH_MSG_APPL_REQUEST:
216                 cp += 2;
217                 TCHECK(*cp);
218                 printf("v%d ", *cp++);
219                 PRINT;
220                 TCHECK(*cp);
221                 printf(" (%d)", *cp++);
222                 TCHECK(*cp);
223                 printf(" (%d)", *cp);
224                 break;
225
226         case AUTH_MSG_KDC_REPLY:
227                 if ((cp = krb4_print_hdr(cp)) == NULL)
228                         return;
229                 cp += 10;       /* timestamp + n + exp + kvno */
230                 TCHECK2(*cp, sizeof(short));
231                 len = KTOHSP(kp, cp);
232                 printf(" (%d)", len);
233                 break;
234
235         case AUTH_MSG_ERR_REPLY:
236                 if ((cp = krb4_print_hdr(cp)) == NULL)
237                         return;
238                 cp += 4;          /* timestamp */
239                 TCHECK2(*cp, sizeof(short));
240                 printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
241                 cp += 4;
242                 PRINT;
243                 break;
244
245         default:
246                 fputs("(unknown)", stdout);
247                 break;
248         }
249
250         return;
251 trunc:
252         fputs(tstr, stdout);
253 }
254
255 void
256 krb_print(const u_char *dat, u_int length)
257 {
258         register const struct krb *kp;
259
260         kp = (struct krb *)dat;
261
262         if (dat >= snapend) {
263                 fputs(tstr, stdout);
264                 return;
265         }
266
267         switch (kp->pvno) {
268
269         case 1:
270         case 2:
271         case 3:
272                 printf(" v%d", kp->pvno);
273                 break;
274
275         case 4:
276                 printf(" v%d", kp->pvno);
277                 krb4_print((const u_char *)kp);
278                 break;
279
280         case 106:
281         case 107:
282                 fputs(" v5", stdout);
283                 /* Decode ASN.1 here "someday" */
284                 break;
285         }
286         return;
287 }