1/* 2 * lib/krb5/krb/decode_kdc.c 3 * 4 * Copyright 1990 by the Massachusetts Institute of Technology. 5 * All Rights Reserved. 6 * 7 * Export of this software from the United States of America may 8 * require a specific license from the United States Government. 9 * It is the responsibility of any person or organization contemplating 10 * export to obtain such a license before exporting. 11 * 12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 13 * distribute this software and its documentation for any purpose and 14 * without fee is hereby granted, provided that the above copyright 15 * notice appear in all copies and that both that copyright notice and 16 * this permission notice appear in supporting documentation, and that 17 * the name of M.I.T. not be used in advertising or publicity pertaining 18 * to distribution of the software without specific, written prior 19 * permission. Furthermore if you modify this software you must label 20 * your software as modified software and not distribute it in such a 21 * fashion that it might be confused with the original M.I.T. software. 22 * M.I.T. makes no representations about the suitability of 23 * this software for any purpose. It is provided "as is" without express 24 * or implied warranty. 25 * 26 * 27 * krb5_decode_kdc_rep() function. 28 */ 29 30#include "k5-int.h" 31 32/* 33 Takes a KDC_REP message and decrypts encrypted part using etype and 34 *key, putting result in *rep. 35 dec_rep->client,ticket,session,last_req,server,caddrs 36 are all set to allocated storage which should be freed by the caller 37 when finished with the response. 38 39 If the response isn't a KDC_REP (tgs or as), it returns an error from 40 the decoding routines. 41 42 returns errors from encryption routines, system errors 43 */ 44 45krb5_error_code 46krb5_decode_kdc_rep(krb5_context context, krb5_data *enc_rep, const krb5_keyblock *key, krb5_kdc_rep **dec_rep) 47{ 48 krb5_error_code retval; 49 krb5_kdc_rep *local_dec_rep; 50 krb5_keyusage usage; 51 52 if (krb5_is_as_rep(enc_rep)) { 53 usage = KRB5_KEYUSAGE_AS_REP_ENCPART; 54 retval = decode_krb5_as_rep(enc_rep, &local_dec_rep); 55 } else if (krb5_is_tgs_rep(enc_rep)) { 56 usage = KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY; 57 /* KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY would go here, except 58 that this client code base doesn't ever put a subkey in the 59 tgs_req authenticator, so the tgs_rep is never encrypted in 60 one. (Check send_tgs.c:krb5_send_tgs_basic(), near the top 61 where authent.subkey is set to 0) */ 62 retval = decode_krb5_tgs_rep(enc_rep, &local_dec_rep); 63 } else { 64 return KRB5KRB_AP_ERR_MSG_TYPE; 65 } 66 67 if (retval) 68 return retval; 69 70 if ((retval = krb5_kdc_rep_decrypt_proc(context, key, &usage, 71 local_dec_rep))) 72 krb5_free_kdc_rep(context, local_dec_rep); 73 else 74 *dec_rep = local_dec_rep; 75 return(retval); 76} 77 78