Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 1 | // This file was extracted from the TCG Published |
| 2 | // Trusted Platform Module Library |
| 3 | // Part 3: Commands |
| 4 | // Family "2.0" |
| 5 | // Level 00 Revision 01.16 |
| 6 | // October 30, 2014 |
| 7 | |
| 8 | #include "InternalRoutines.h" |
| 9 | #include "PolicySecret_fp.h" |
| 10 | #include "Policy_spt_fp.h" |
| 11 | // |
| 12 | // |
| 13 | // Error Returns Meaning |
| 14 | // |
| 15 | // TPM_RC_CPHASH cpHash for policy was previously set to a value that is not the same |
| 16 | // as cpHashA |
| 17 | // TPM_RC_EXPIRED expiration indicates a time in the past |
| 18 | // TPM_RC_NONCE nonceTPM does not match the nonce associated with policySession |
| 19 | // TPM_RC_SIZE cpHashA is not the size of a digest for the hash associated with |
| 20 | // policySession |
| 21 | // TPM_RC_VALUE input policyID or expiration does not match the internal data in policy |
| 22 | // session |
| 23 | // |
| 24 | TPM_RC |
| 25 | TPM2_PolicySecret( |
| 26 | PolicySecret_In *in, // IN: input parameter list |
| 27 | PolicySecret_Out *out // OUT: output parameter list |
| 28 | ) |
| 29 | { |
| 30 | TPM_RC result; |
| 31 | SESSION *session; |
| 32 | TPM2B_NAME entityName; |
| 33 | UINT32 expiration = (in->expiration < 0) |
| 34 | ? -(in->expiration) : in->expiration; |
| 35 | UINT64 authTimeout = 0; |
| 36 | |
| 37 | // Input Validation |
| 38 | |
| 39 | // Get pointer to the session structure |
| 40 | session = SessionGet(in->policySession); |
| 41 | |
| 42 | //Only do input validation if this is not a trial policy session |
| 43 | if(session->attributes.isTrialPolicy == CLEAR) |
| 44 | { |
| 45 | |
| 46 | if(expiration != 0) |
| 47 | authTimeout = expiration * 1000 + session->startTime; |
| 48 | |
| 49 | result = PolicyParameterChecks(session, authTimeout, |
| 50 | &in->cpHashA, &in->nonceTPM, |
| 51 | RC_PolicySecret_nonceTPM, |
| 52 | RC_PolicySecret_cpHashA, |
| 53 | RC_PolicySecret_expiration); |
| 54 | if(result != TPM_RC_SUCCESS) |
| 55 | return result; |
| 56 | } |
| 57 | |
| 58 | // Internal Data Update |
| 59 | // Need the name of the authorizing entity |
ChromeOS Developer | e85c65b | 2015-07-10 10:12:43 -0700 | [diff] [blame] | 60 | entityName.t.size = EntityGetName(in->authHandle, &entityName.t.name); |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 61 | |
| 62 | // Update policy context with input policyRef and name of auth key |
| 63 | // This value is computed even for trial sessions. Possibly update the cpHash |
| 64 | PolicyContextUpdate(TPM_CC_PolicySecret, &entityName, &in->policyRef, |
| 65 | &in->cpHashA, authTimeout, session); |
| 66 | |
| 67 | // Command Output |
| 68 | |
| 69 | // Create ticket and timeout buffer if in->expiration < 0 and this is not |
| 70 | // a trial session. |
| 71 | // NOTE: PolicyParameterChecks() makes sure that nonceTPM is present |
| 72 | // when expiration is non-zero. |
| 73 | if( in->expiration < 0 |
| 74 | && session->attributes.isTrialPolicy == CLEAR |
| 75 | ) |
| 76 | { |
| 77 | // Generate timeout buffer. The format of output timeout buffer is |
| 78 | // TPM-specific. |
| 79 | // Note: can't do a direct copy because the output buffer is a byte |
| 80 | // array and it may not be aligned to accept a 64-bit value. The method |
| 81 | // used has the side-effect of making the returned value a big-endian, |
| 82 | // 64-bit value that is byte aligned. |
| 83 | out->timeout.t.size = sizeof(UINT64); |
Vadim Bendebury | 99e8883 | 2015-06-04 20:32:54 -0700 | [diff] [blame] | 84 | UINT64_TO_BYTE_ARRAY(authTimeout, out->timeout.t.buffer); |
Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 85 | |
| 86 | // Compute policy ticket |
| 87 | TicketComputeAuth(TPM_ST_AUTH_SECRET, EntityGetHierarchy(in->authHandle), |
| 88 | authTimeout, &in->cpHashA, &in->policyRef, |
| 89 | &entityName, &out->policyTicket); |
| 90 | } |
| 91 | else |
| 92 | { |
| 93 | // timeout buffer is null |
| 94 | out->timeout.t.size = 0; |
| 95 | |
| 96 | // auth ticket is null |
| 97 | out->policyTicket.tag = TPM_ST_AUTH_SECRET; |
| 98 | out->policyTicket.hierarchy = TPM_RH_NULL; |
| 99 | out->policyTicket.digest.t.size = 0; |
| 100 | } |
| 101 | |
| 102 | return TPM_RC_SUCCESS; |
| 103 | } |