xref: /titanic_51/usr/src/cmd/krb5/krb5kdc/dispatch.c (revision 21b926adb26b0bf23fe75045ed308af582303bd0)
1 /*
2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*
7  * kdc/dispatch.c
8  *
9  * Copyright 1990 by the Massachusetts Institute of Technology.
10  *
11  * Export of this software from the United States of America may
12  *   require a specific license from the United States Government.
13  *   It is the responsibility of any person or organization contemplating
14  *   export to obtain such a license before exporting.
15  *
16  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
17  * distribute this software and its documentation for any purpose and
18  * without fee is hereby granted, provided that the above copyright
19  * notice appear in all copies and that both that copyright notice and
20  * this permission notice appear in supporting documentation, and that
21  * the name of M.I.T. not be used in advertising or publicity pertaining
22  * to distribution of the software without specific, written prior
23  * permission.  Furthermore if you modify this software you must label
24  * your software as modified software and not distribute it in such a
25  * fashion that it might be confused with the original M.I.T. software.
26  * M.I.T. makes no representations about the suitability of
27  * this software for any purpose.  It is provided "as is" without express
28  * or implied warranty.
29  *
30  *
31  * Dispatch an incoming packet.
32  */
33 
34 
35 #include "k5-int.h"
36 #include <syslog.h>
37 #include "kdc_util.h"
38 #include "extern.h"
39 #include "adm_proto.h"
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
42 #include <string.h>
43 
44 static krb5_int32 last_usec = 0, last_os_random = 0;
45 
46 krb5_error_code
47 dispatch(krb5_data *pkt, const krb5_fulladdr *from, krb5_data **response)
48 {
49 
50     krb5_error_code retval;
51     krb5_kdc_req *as_req;
52     krb5_int32 now, now_usec;
53 
54     /* decode incoming packet, and dispatch */
55 
56 #ifndef NOCACHE
57     /* try the replay lookaside buffer */
58     if (kdc_check_lookaside(pkt, response)) {
59 	/* a hit! */
60 	const char *name = 0;
61 	char buf[46];
62 
63 	name = (char *) inet_ntop (ADDRTYPE2FAMILY (from->address->addrtype),
64 			  from->address->contents, buf, sizeof (buf));
65 	if (name == 0)
66 	    name = "[unknown address type]";
67 	krb5_klog_syslog(LOG_INFO,
68 			 "DISPATCH: repeated (retransmitted?) request from %s, resending previous response",
69 			 name);
70 	return 0;
71     }
72 #endif
73 /* SUNW14resync XXX */
74 #if 0
75     retval = krb5_crypto_us_timeofday(&now, &now_usec);
76     if (retval == 0) {
77       krb5_int32 usec_difference = now_usec-last_usec;
78       krb5_data data;
79       if(last_os_random == 0)
80 	last_os_random = now;
81       /* Grab random data from OS every hour*/
82       if(now-last_os_random >= 60*60) {
83 	krb5_c_random_os_entropy(kdc_context, 0, NULL);
84 	last_os_random = now;
85       }
86 
87       data.length = sizeof(krb5_int32);
88       data.data = (void *) &usec_difference;
89 
90       krb5_c_random_add_entropy(kdc_context,
91 				KRB5_C_RANDSOURCE_TIMING, &data);
92       last_usec = now_usec;
93     }
94 #endif
95     /* try TGS_REQ first; they are more common! */
96 
97     if (krb5_is_tgs_req(pkt)) {
98 	retval = process_tgs_req(pkt, from, response);
99     } else if (krb5_is_as_req(pkt)) {
100 	if (!(retval = decode_krb5_as_req(pkt, &as_req))) {
101 	    /*
102 	     * setup_server_realm() sets up the global realm-specific data
103 	     * pointer.
104 	     */
105 	    if (!(retval = setup_server_realm(as_req->server))) {
106 		retval = process_as_req(as_req, pkt, from, response);
107 	    }
108 	    krb5_free_kdc_req(kdc_context, as_req);
109 	}
110     }
111 #ifdef KRB5_KRB4_COMPAT
112     else if (pkt->data[0] == 4)		/* old version */
113 	retval = process_v4(pkt, from, response);
114 #endif
115     else
116 	retval = KRB5KRB_AP_ERR_MSG_TYPE;
117 #ifndef NOCACHE
118     /* put the response into the lookaside buffer */
119     if (!retval)
120 	kdc_insert_lookaside(pkt, *response);
121 #endif
122 
123     return retval;
124 }
125