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