1 /* Microsoft Reference Implementation for TPM 2.0
2 *
3 * The copyright in this software is being made available under the BSD License,
4 * included below. This software may be subject to other third party and
5 * contributor rights, including patent rights, and no such rights are granted
6 * under this license.
7 *
8 * Copyright (c) Microsoft Corporation
9 *
10 * All rights reserved.
11 *
12 * BSD License
13 *
14 * Redistribution and use in source and binary forms, with or without modification,
15 * are permitted provided that the following conditions are met:
16 *
17 * Redistributions of source code must retain the above copyright notice, this list
18 * of conditions and the following disclaimer.
19 *
20 * Redistributions in binary form must reproduce the above copyright notice, this
21 * list of conditions and the following disclaimer in the documentation and/or
22 * other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
28 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
31 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #include "Tpm.h"
36 #include "DictionaryAttackParameters_fp.h"
37
38 #if CC_DictionaryAttackParameters // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // change the lockout parameters
42 */
43 TPM_RC
TPM2_DictionaryAttackParameters(DictionaryAttackParameters_In * in)44 TPM2_DictionaryAttackParameters(
45 DictionaryAttackParameters_In *in // IN: input parameter list
46 )
47 {
48 // The command needs NV update.
49 RETURN_IF_NV_IS_NOT_AVAILABLE;
50
51 // Internal Data Update
52
53 // Set dictionary attack parameters
54 gp.maxTries = in->newMaxTries;
55 gp.recoveryTime = in->newRecoveryTime;
56 gp.lockoutRecovery = in->lockoutRecovery;
57
58 #if 0 // Errata eliminates this code
59 // This functionality has been disabled. The preferred implementation is now
60 // to leave failedTries unchanged when the parameters are changed. This could
61 // have the effect of putting the TPM into DA lockout if in->newMaxTries is
62 // not greater than the current value of gp.failedTries.
63 // Set failed tries to 0
64 gp.failedTries = 0;
65 #endif
66
67 // Record the changes to NV
68 NV_SYNC_PERSISTENT(failedTries);
69 NV_SYNC_PERSISTENT(maxTries);
70 NV_SYNC_PERSISTENT(recoveryTime);
71 NV_SYNC_PERSISTENT(lockoutRecovery);
72
73 return TPM_RC_SUCCESS;
74 }
75
76 #endif // CC_DictionaryAttackParameters