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
krb5_decrypt_tkt_part(krb5_context context,const krb5_keyblock * srv_key,register krb5_ticket * ticket)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