1 #pragma ident "%Z%%M% %I% %E% SMI"
2 /*
3 * lib/krb5/krb/decrypt_tk.c
4 *
5 * Copyright 1990 by the Massachusetts Institute of Technology.
6 * All Rights Reserved.
7 *
8 * Export of this software from the United States of America may
9 * require a specific license from the United States Government.
10 * It is the responsibility of any person or organization contemplating
11 * export to obtain such a license before exporting.
12 *
13 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
14 * distribute this software and its documentation for any purpose and
15 * without fee is hereby granted, provided that the above copyright
16 * notice appear in all copies and that both that copyright notice and
17 * this permission notice appear in supporting documentation, and that
18 * the name of M.I.T. not be used in advertising or publicity pertaining
19 * to distribution of the software without specific, written prior
20 * permission. Furthermore if you modify this software you must label
21 * your software as modified software and not distribute it in such a
22 * fashion that it might be confused with the original M.I.T. software.
23 * M.I.T. makes no representations about the suitability of
24 * this software for any purpose. It is provided "as is" without express
25 * or implied warranty.
26 *
27 *
28 * krb5_decrypt_tkt_part() function.
29 */
30
31 #include <k5-int.h>
32
33 /*
34 Decrypts dec_ticket->enc_part
35 using *srv_key, and places result in dec_ticket->enc_part2.
36 The storage of dec_ticket->enc_part2 will be allocated before return.
37
38 returns errors from encryption routines, system errors
39
40 */
41
42 /*ARGSUSED*/
43 krb5_error_code KRB5_CALLCONV
krb5_decrypt_tkt_part(krb5_context context,const krb5_keyblock * srv_key,register krb5_ticket * ticket)44 krb5_decrypt_tkt_part(krb5_context context, const krb5_keyblock *srv_key, register krb5_ticket *ticket)
45 {
46 krb5_enc_tkt_part *dec_tkt_part;
47 krb5_data scratch;
48 krb5_error_code retval;
49
50 if (!krb5_c_valid_enctype(ticket->enc_part.enctype))
51 return KRB5_PROG_ETYPE_NOSUPP;
52
53 scratch.length = ticket->enc_part.ciphertext.length;
54 if (!(scratch.data = malloc(ticket->enc_part.ciphertext.length)))
55 return(ENOMEM);
56
57 /* call the encryption routine */
58 if ((retval = krb5_c_decrypt(context, srv_key,
59 KRB5_KEYUSAGE_KDC_REP_TICKET, 0,
60 &ticket->enc_part, &scratch))) {
61 free(scratch.data);
62 return retval;
63 }
64
65 #define clean_scratch() {memset(scratch.data, 0, scratch.length); \
66 free(scratch.data);}
67
68 /* now decode the decrypted stuff */
69 retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part);
70 if (!retval) {
71 ticket->enc_part2 = dec_tkt_part;
72 }
73 clean_scratch();
74 return retval;
75 }
76