17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * lib/krb5/krb/decrypt_tk.c
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * Copyright 1990 by the Massachusetts Institute of Technology.
57c478bd9Sstevel@tonic-gate * All Rights Reserved.
67c478bd9Sstevel@tonic-gate *
77c478bd9Sstevel@tonic-gate * Export of this software from the United States of America may
87c478bd9Sstevel@tonic-gate * require a specific license from the United States Government.
97c478bd9Sstevel@tonic-gate * It is the responsibility of any person or organization contemplating
107c478bd9Sstevel@tonic-gate * export to obtain such a license before exporting.
11*1da57d55SToomas Soome *
127c478bd9Sstevel@tonic-gate * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
137c478bd9Sstevel@tonic-gate * distribute this software and its documentation for any purpose and
147c478bd9Sstevel@tonic-gate * without fee is hereby granted, provided that the above copyright
157c478bd9Sstevel@tonic-gate * notice appear in all copies and that both that copyright notice and
167c478bd9Sstevel@tonic-gate * this permission notice appear in supporting documentation, and that
177c478bd9Sstevel@tonic-gate * the name of M.I.T. not be used in advertising or publicity pertaining
187c478bd9Sstevel@tonic-gate * to distribution of the software without specific, written prior
197c478bd9Sstevel@tonic-gate * permission. Furthermore if you modify this software you must label
207c478bd9Sstevel@tonic-gate * your software as modified software and not distribute it in such a
217c478bd9Sstevel@tonic-gate * fashion that it might be confused with the original M.I.T. software.
227c478bd9Sstevel@tonic-gate * M.I.T. makes no representations about the suitability of
237c478bd9Sstevel@tonic-gate * this software for any purpose. It is provided "as is" without express
247c478bd9Sstevel@tonic-gate * or implied warranty.
25*1da57d55SToomas Soome *
267c478bd9Sstevel@tonic-gate *
277c478bd9Sstevel@tonic-gate * krb5_decrypt_tkt_part() function.
287c478bd9Sstevel@tonic-gate */
297c478bd9Sstevel@tonic-gate
307c478bd9Sstevel@tonic-gate #include <k5-int.h>
317c478bd9Sstevel@tonic-gate
327c478bd9Sstevel@tonic-gate /*
337c478bd9Sstevel@tonic-gate Decrypts dec_ticket->enc_part
347c478bd9Sstevel@tonic-gate using *srv_key, and places result in dec_ticket->enc_part2.
357c478bd9Sstevel@tonic-gate The storage of dec_ticket->enc_part2 will be allocated before return.
367c478bd9Sstevel@tonic-gate
377c478bd9Sstevel@tonic-gate returns errors from encryption routines, system errors
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate */
407c478bd9Sstevel@tonic-gate
417c478bd9Sstevel@tonic-gate /*ARGSUSED*/
42505d05c7Sgtb krb5_error_code KRB5_CALLCONV
krb5_decrypt_tkt_part(krb5_context context,const krb5_keyblock * srv_key,register krb5_ticket * ticket)43505d05c7Sgtb krb5_decrypt_tkt_part(krb5_context context, const krb5_keyblock *srv_key, register krb5_ticket *ticket)
447c478bd9Sstevel@tonic-gate {
457c478bd9Sstevel@tonic-gate krb5_enc_tkt_part *dec_tkt_part;
467c478bd9Sstevel@tonic-gate krb5_data scratch;
477c478bd9Sstevel@tonic-gate krb5_error_code retval;
487c478bd9Sstevel@tonic-gate
49505d05c7Sgtb if (!krb5_c_valid_enctype(ticket->enc_part.enctype))
507c478bd9Sstevel@tonic-gate return KRB5_PROG_ETYPE_NOSUPP;
517c478bd9Sstevel@tonic-gate
527c478bd9Sstevel@tonic-gate scratch.length = ticket->enc_part.ciphertext.length;
537c478bd9Sstevel@tonic-gate if (!(scratch.data = malloc(ticket->enc_part.ciphertext.length)))
547c478bd9Sstevel@tonic-gate return(ENOMEM);
557c478bd9Sstevel@tonic-gate
567c478bd9Sstevel@tonic-gate /* call the encryption routine */
57505d05c7Sgtb if ((retval = krb5_c_decrypt(context, srv_key,
587c478bd9Sstevel@tonic-gate KRB5_KEYUSAGE_KDC_REP_TICKET, 0,
59505d05c7Sgtb &ticket->enc_part, &scratch))) {
607c478bd9Sstevel@tonic-gate free(scratch.data);
617c478bd9Sstevel@tonic-gate return retval;
627c478bd9Sstevel@tonic-gate }
637c478bd9Sstevel@tonic-gate
647c478bd9Sstevel@tonic-gate #define clean_scratch() {memset(scratch.data, 0, scratch.length); \
657c478bd9Sstevel@tonic-gate free(scratch.data);}
667c478bd9Sstevel@tonic-gate
677c478bd9Sstevel@tonic-gate /* now decode the decrypted stuff */
687c478bd9Sstevel@tonic-gate retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part);
697c478bd9Sstevel@tonic-gate if (!retval) {
707c478bd9Sstevel@tonic-gate ticket->enc_part2 = dec_tkt_part;
717c478bd9Sstevel@tonic-gate }
727c478bd9Sstevel@tonic-gate clean_scratch();
737c478bd9Sstevel@tonic-gate return retval;
747c478bd9Sstevel@tonic-gate }
75