1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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 #include "k5-int.h"
28
29 /*
30 Decrypts dec_ticket->enc_part
31 using *srv_key, and places result in dec_ticket->enc_part2.
32 The storage of dec_ticket->enc_part2 will be allocated before return.
33
34 returns errors from encryption routines, system errors
35
36 */
37
38 krb5_error_code KRB5_CALLCONV
krb5_decrypt_tkt_part(krb5_context context,const krb5_keyblock * srv_key,krb5_ticket * ticket)39 krb5_decrypt_tkt_part(krb5_context context, const krb5_keyblock *srv_key,
40 krb5_ticket *ticket)
41 {
42 krb5_enc_tkt_part *dec_tkt_part;
43 krb5_data scratch;
44 krb5_error_code retval;
45
46 if (!krb5_c_valid_enctype(ticket->enc_part.enctype))
47 return KRB5_PROG_ETYPE_NOSUPP;
48
49 if (!krb5_is_permitted_enctype(context, ticket->enc_part.enctype))
50 return KRB5_NOPERM_ETYPE;
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 /* now decode the decrypted stuff */
65 retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part);
66 if (!retval) {
67 ticket->enc_part2 = dec_tkt_part;
68 }
69 zapfree(scratch.data, scratch.length);
70 return retval;
71 }
72