1 /* 2 * lib/krb5/krb/decrypt_tk.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_decrypt_tkt_part() function. 28 */ 29 30 #include <k5-int.h> 31 32 /* 33 Decrypts dec_ticket->enc_part 34 using *srv_key, and places result in dec_ticket->enc_part2. 35 The storage of dec_ticket->enc_part2 will be allocated before return. 36 37 returns errors from encryption routines, system errors 38 39 */ 40 41 /*ARGSUSED*/ 42 krb5_error_code KRB5_CALLCONV 43 krb5_decrypt_tkt_part(krb5_context context, const krb5_keyblock *srv_key, register krb5_ticket *ticket) 44 { 45 krb5_enc_tkt_part *dec_tkt_part; 46 krb5_data scratch; 47 krb5_error_code retval; 48 49 if (!krb5_c_valid_enctype(ticket->enc_part.enctype)) 50 return KRB5_PROG_ETYPE_NOSUPP; 51 52 scratch.length = ticket->enc_part.ciphertext.length; 53 if (!(scratch.data = malloc(ticket->enc_part.ciphertext.length))) 54 return(ENOMEM); 55 56 /* call the encryption routine */ 57 if ((retval = krb5_c_decrypt(context, srv_key, 58 KRB5_KEYUSAGE_KDC_REP_TICKET, 0, 59 &ticket->enc_part, &scratch))) { 60 free(scratch.data); 61 return retval; 62 } 63 64 #define clean_scratch() {memset(scratch.data, 0, scratch.length); \ 65 free(scratch.data);} 66 67 /* now decode the decrypted stuff */ 68 retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part); 69 if (!retval) { 70 ticket->enc_part2 = dec_tkt_part; 71 } 72 clean_scratch(); 73 return retval; 74 } 75