static krb5_error_code
decrypt_tkt_enc_part (krb5_context context,
krb5_keyblock *key,
EncryptedData *enc_part,
EncTicketPart *decr_part)
{
krb5_error_code ret;
krb5_data plain;
size_t len;
krb5_crypto crypto;
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret)
return ret;
ret = krb5_decrypt_EncryptedData (context,
crypto,
KRB5_KU_TICKET,
enc_part,
&plain);
krb5_crypto_destroy(context, crypto);
if (ret)
return ret;
ret = krb5_decode_EncTicketPart(context, plain.data, plain.length,
decr_part, &len);
krb5_data_free (&plain);
return ret;
}
static void
print_and_decode_tkt (krb5_context context,
krb5_data *ticket,
krb5_principal server,
krb5_enctype enctype)
{
krb5_error_code ret;
krb5_crypto crypto;
krb5_data dec_data;
size_t len;
EncTicketPart decr_part;
krb5_keyblock key;
Ticket tkt;
ret = decode_Ticket (ticket->data, ticket->length, &tkt, &len);
if (ret)
krb5_err (context, 1, ret, "decode_Ticket");
ret = krb5_string_to_key (context, enctype, "foo", server, &key);
if (ret)
krb5_err (context, 1, ret, "krb5_string_to_key");
ret = krb5_crypto_init(context, &key, 0, &crypto);
if (ret)
krb5_err (context, 1, ret, "krb5_crypto_init");
ret = krb5_decrypt_EncryptedData (context, crypto, KRB5_KU_TICKET,
&tkt.enc_part, &dec_data);
krb5_crypto_destroy (context, crypto);
if (ret)
krb5_err (context, 1, ret, "krb5_decrypt_EncryptedData");
ret = krb5_decode_EncTicketPart (context, dec_data.data, dec_data.length,
&decr_part, &len);
krb5_data_free (&dec_data);
if (ret)
krb5_err (context, 1, ret, "krb5_decode_EncTicketPart");
}
krb5_error_code
_kdc_do_524(krb5_context context,
krb5_kdc_configuration *config,
const Ticket *t, krb5_data *reply,
const char *from, struct sockaddr *addr)
{
krb5_error_code ret = 0;
krb5_crypto crypto;
hdb_entry_ex *server = NULL;
Key *skey;
krb5_data et_data;
EncTicketPart et;
EncryptedData ticket;
krb5_storage *sp;
char *spn = NULL;
unsigned char buf[MAX_KTXT_LEN + 4 * 4];
size_t len;
int kvno = 0;
if(!config->enable_524) {
ret = KRB5KDC_ERR_POLICY;
kdc_log(context, config, 0,
"Rejected ticket conversion request from %s", from);
goto out;
}
ret = fetch_server (context, config, t, &spn, &server, from);
if (ret) {
goto out;
}
ret = hdb_enctype2key(context, &server->entry, t->enc_part.etype, &skey);
if(ret){
kdc_log(context, config, 0,
"No suitable key found for server (%s) from %s", spn, from);
goto out;
}
ret = krb5_crypto_init(context, &skey->key, 0, &crypto);
if (ret) {
kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
krb5_get_err_text(context, ret));
goto out;
}
ret = krb5_decrypt_EncryptedData (context,
crypto,
KRB5_KU_TICKET,
&t->enc_part,
&et_data);
krb5_crypto_destroy(context, crypto);
if(ret){
kdc_log(context, config, 0,
"Failed to decrypt ticket from %s for %s", from, spn);
goto out;
}
ret = krb5_decode_EncTicketPart(context, et_data.data, et_data.length,
&et, &len);
krb5_data_free(&et_data);
if(ret){
kdc_log(context, config, 0,
"Failed to decode ticket from %s for %s", from, spn);
goto out;
}
ret = log_524 (context, config, &et, from, spn);
if (ret) {
free_EncTicketPart(&et);
goto out;
}
ret = verify_flags (context, config, &et, spn);
if (ret) {
free_EncTicketPart(&et);
goto out;
}
ret = set_address (context, config, &et, addr, from);
if (ret) {
free_EncTicketPart(&et);
goto out;
}
ret = encode_524_response(context, config, spn, et, t,
server, &ticket, &kvno);
free_EncTicketPart(&et);
out:
/* make reply */
memset(buf, 0, sizeof(buf));
sp = krb5_storage_from_mem(buf, sizeof(buf));
if (sp) {
krb5_store_int32(sp, ret);
if(ret == 0){
krb5_store_int32(sp, kvno);
krb5_store_data(sp, ticket.cipher);
/* Aargh! This is coded as a KTEXT_ST. */
krb5_storage_seek(sp, MAX_KTXT_LEN - ticket.cipher.length, SEEK_CUR);
krb5_store_int32(sp, 0); /* mbz */
free_EncryptedData(&ticket);
}
ret = krb5_storage_to_data(sp, reply);
reply->length = krb5_storage_seek(sp, 0, SEEK_CUR);
krb5_storage_free(sp);
} else
krb5_data_zero(reply);
if(spn)
free(spn);
if(server)
_kdc_free_ent (context, server);
return ret;
}
