print-krb.c revision 17680 
1/*
2 * Copyright (c) 1995, 1996
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
25static char rcsid[] =
26    "@(#) $Header: print-krb.c,v 1.6 96/07/23 14:17:24 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
47const u_char *c_print(register const u_char *, register const u_char *);
48const u_char *krb4_print_hdr(const u_char *);
49void krb4_print(const u_char *);
50void 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
75struct krb {
76    u_char pvno;		/* Protocol Version */
77    u_char type;		/* Type+B */
78};
79
80static char tstr[] = " [|kerberos]";
81
82static 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
95static 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
129const u_char *
130c_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 (ep == NULL || 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
158const u_char *
159krb4_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	TCHECK2(cp, 0);
166	PRINT;
167	TCHECK2(cp, 0);
168	putchar('.'); PRINT;
169	TCHECK2(cp, 0);
170	putchar('@'); PRINT;
171	return(cp);
172
173trunc:
174	fputs(tstr, stdout);
175	return(NULL);
176
177#undef PRINT
178}
179
180void
181krb4_print(const u_char *cp)
182{
183	register const struct krb *kp;
184	u_char type;
185	u_short len;
186
187#define PRINT		if ((cp=c_print(cp, snapend))==NULL) goto trunc
188/*  True if struct krb is little endian */
189#define IS_LENDIAN(kp)	(((kp)->type & 0x01) != 0)
190#define KTOHSP(kp, cp)	(IS_LENDIAN(kp) ? vtohsp(cp) : ntohsp(cp))
191
192	kp = (struct krb *)cp;
193
194	if ((&kp->type) >= snapend) {
195		fputs(tstr, stdout);
196		return;
197	}
198
199	type = kp->type & (0xFF << 1);
200
201	printf(" %s %s: ",
202	    IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
203
204	switch (type) {
205
206	case AUTH_MSG_KDC_REQUEST:
207		if ((cp = krb4_print_hdr(cp)) == NULL)
208			return;
209		 cp += 4; 	  /* ctime */
210		 TCHECK2(cp, 0);
211		 printf(" %dmin ", *cp++ * 5);
212		 TCHECK2(cp, 0);
213		 PRINT;
214		 TCHECK2(cp, 0);
215		 putchar('.');  PRINT;
216		 break;
217
218	case AUTH_MSG_APPL_REQUEST:
219		cp += 2;
220		TCHECK2(cp, 0);
221		printf("v%d ", *cp++);
222		TCHECK2(cp, 0);
223		PRINT;
224		TCHECK2(cp, 0);
225		printf(" (%d)", *cp++);
226		TCHECK2(cp, 0);
227		printf(" (%d)", *cp);
228		TCHECK2(cp, 0);
229		break;
230
231	case AUTH_MSG_KDC_REPLY:
232		if ((cp = krb4_print_hdr(cp)) == NULL)
233			return;
234		cp += 10;	/* timestamp + n + exp + kvno */
235		TCHECK2(cp, 0);
236		len = KTOHSP(kp, cp);
237		printf(" (%d)", len);
238		TCHECK2(cp, 0);
239		break;
240
241	case AUTH_MSG_ERR_REPLY:
242		if ((cp = krb4_print_hdr(cp)) == NULL)
243			return;
244		cp += 4; 	  /* timestamp */
245		TCHECK2(cp, 0);
246		printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
247		cp += 4;
248		TCHECK2(cp, 0);
249		PRINT;
250		break;
251
252	default:
253		fputs("(unknown)", stdout);
254		break;
255	}
256
257	return;
258trunc:
259	fputs(tstr, stdout);
260}
261
262void
263krb_print(const u_char *dat, u_int length)
264{
265	register const struct krb *kp;
266
267	kp = (struct krb *)dat;
268
269	if (dat >= snapend) {
270		fputs(tstr, stdout);
271		return;
272	}
273
274	switch (kp->pvno) {
275
276	case 1:
277	case 2:
278	case 3:
279		printf(" v%d", kp->pvno);
280		break;
281
282	case 4:
283		printf(" v%d", kp->pvno);
284		krb4_print((const u_char*)kp);
285		break;
286
287	case 106:
288	case 107:
289		fputs(" v5", stdout);
290		/* Decode ASN.1 here "someday" */
291		break;
292	}
293	return;
294}
295