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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: print-krb.c,v 1.9 97/04/26 14:01:45 leres Exp $";
27 #endif
28
29 #include <sys/param.h>
30 #include <sys/time.h>
31 #include <sys/socket.h>
32
33 #include <netinet/in.h>
34 #include <netinet/in_systm.h>
35 #include <netinet/ip.h>
36 #include <netinet/ip_var.h>
37 #include <netinet/udp.h>
38 #include <netinet/udp_var.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 }