/********************************************************************************/

/*                    */

/*         Attestation Commands         */

/*           Written by Ken Goldman       */

/*           IBM Thomas J. Watson Research Center     */

/*            $Id: AttestationCommands.c 1658 2021-01-22 23:14:01Z kgoldman $ */

/*                    */

/*  Licenses and Notices              */

/*                    */

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/*  (c) Copyright IBM Corp. and others, 2016 - 2021       */

/*                    */

/********************************************************************************/

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "Certify_fp.h"

#if CC_Certify  // Conditional expansion of this file

TPM_RC

TPM2_Certify(

       Certify_In      *in,            // IN: input parameter list

       Certify_Out     *out            // OUT: output parameter list

       )

{

    TPMS_ATTEST             certifyInfo;

    OBJECT                  *signObject = HandleToObject(in->signHandle);

    OBJECT                  *certifiedObject = HandleToObject(in->objectHandle);

    // Input validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_Certify_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_Certify_inScheme;

    // Command Output

    // Filling in attest information

    // Common fields

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData,

         &certifyInfo);

    // Certify specific fields

    certifyInfo.type = TPM_ST_ATTEST_CERTIFY;

    // NOTE: the certified object is not allowed to be TPM_ALG_NULL so

    // 'certifiedObject' will never be NULL

    certifyInfo.attested.certify.name = certifiedObject->name;

    // When using an anonymous signing scheme, need to set the qualified Name to the

    // empty buffer to avoid correlation between keys

    if(CryptIsSchemeAnonymous(in->inScheme.scheme))

  certifyInfo.attested.certify.qualifiedName.t.size = 0;

    else

  certifyInfo.attested.certify.qualifiedName = certifiedObject->qualifiedName;

    // Sign attestation structure.  A NULL signature will be returned if

    // signHandle is TPM_RH_NULL.  A TPM_RC_NV_UNAVAILABLE, TPM_RC_NV_RATE,

    // TPM_RC_VALUE, TPM_RC_SCHEME or TPM_RC_ATTRIBUTES error may be returned

    // by SignAttestInfo()

    return SignAttestInfo(signObject, &in->inScheme, &certifyInfo,

        &in->qualifyingData, &out->certifyInfo, &out->signature);

}

#endif // CC_Certify

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "CertifyCreation_fp.h"

#if CC_CertifyCreation  // Conditional expansion of this file

TPM_RC

TPM2_CertifyCreation(

         CertifyCreation_In      *in,            // IN: input parameter list

         CertifyCreation_Out     *out            // OUT: output parameter list

         )

{

    TPMT_TK_CREATION        ticket;

    TPMS_ATTEST             certifyInfo;

    OBJECT                  *certified = HandleToObject(in->objectHandle);

    OBJECT                  *signObject = HandleToObject(in->signHandle);

    // Input Validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_CertifyCreation_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_CertifyCreation_inScheme;

    // CertifyCreation specific input validation

    // Re-compute ticket

    TicketComputeCreation(in->creationTicket.hierarchy, &certified->name,

        &in->creationHash, &ticket);

    // Compare ticket

    if(!MemoryEqual2B(&ticket.digest.b, &in->creationTicket.digest.b))

  return TPM_RCS_TICKET + RC_CertifyCreation_creationTicket;

    // Command Output

    // Common fields

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData,

         &certifyInfo);

    // CertifyCreation specific fields

    // Attestation type

    certifyInfo.type = TPM_ST_ATTEST_CREATION;

    certifyInfo.attested.creation.objectName = certified->name;

    // Copy the creationHash

    certifyInfo.attested.creation.creationHash = in->creationHash;

    // Sign attestation structure.  A NULL signature will be returned if

    // signObject is TPM_RH_NULL.  A TPM_RC_NV_UNAVAILABLE, TPM_RC_NV_RATE,

    // TPM_RC_VALUE, TPM_RC_SCHEME or TPM_RC_ATTRIBUTES error may be returned at

    // this point

    return SignAttestInfo(signObject, &in->inScheme, &certifyInfo,

        &in->qualifyingData, &out->certifyInfo,

        &out->signature);

}

#endif // CC_CertifyCreation

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "Quote_fp.h"

#if CC_Quote  // Conditional expansion of this file

TPM_RC

TPM2_Quote(

     Quote_In        *in,            // IN: input parameter list

     Quote_Out       *out            // OUT: output parameter list

     )

{

    TPMI_ALG_HASH            hashAlg;

    TPMS_ATTEST              quoted;

    OBJECT                 *signObject = HandleToObject(in->signHandle);

    // Input Validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_Quote_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_Quote_inScheme;

    // Command Output

    // Filling in attest information

    // Common fields

    // FillInAttestInfo may return TPM_RC_SCHEME or TPM_RC_KEY

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData, &quoted);

    // Quote specific fields

    // Attestation type

    quoted.type = TPM_ST_ATTEST_QUOTE;

    // Get hash algorithm in sign scheme.  This hash algorithm is used to

    // compute PCR digest. If there is no algorithm, then the PCR cannot

    // be digested and this command returns TPM_RC_SCHEME

    hashAlg = in->inScheme.details.any.hashAlg;

    if(hashAlg == TPM_ALG_NULL)

  return TPM_RCS_SCHEME + RC_Quote_inScheme;

    // Compute PCR digest

    PCRComputeCurrentDigest(hashAlg, &in->PCRselect,

          &quoted.attested.quote.pcrDigest);

    // Copy PCR select.  "PCRselect" is modified in PCRComputeCurrentDigest

    // function

    quoted.attested.quote.pcrSelect = in->PCRselect;

    // Sign attestation structure.  A NULL signature will be returned if

    // signObject is NULL.

    return SignAttestInfo(signObject, &in->inScheme, &quoted, &in->qualifyingData,

        &out->quoted, &out->signature);

}

#endif // CC_Quote

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "GetSessionAuditDigest_fp.h"

#if CC_GetSessionAuditDigest  // Conditional expansion of this file

TPM_RC

TPM2_GetSessionAuditDigest(

         GetSessionAuditDigest_In    *in,            // IN: input parameter list

         GetSessionAuditDigest_Out   *out            // OUT: output parameter list

         )

{

    SESSION                 *session = SessionGet(in->sessionHandle);

    TPMS_ATTEST              auditInfo;

    OBJECT                 *signObject = HandleToObject(in->signHandle);

    // Input Validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_GetSessionAuditDigest_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_GetSessionAuditDigest_inScheme;

    // session must be an audit session

    if(session->attributes.isAudit == CLEAR)

  return TPM_RCS_TYPE + RC_GetSessionAuditDigest_sessionHandle;

    // Command Output

    // Fill in attest information common fields

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData,

         &auditInfo);

    // SessionAuditDigest specific fields

    auditInfo.type = TPM_ST_ATTEST_SESSION_AUDIT;

    auditInfo.attested.sessionAudit.sessionDigest = session->u2.auditDigest;

    // Exclusive audit session

    auditInfo.attested.sessionAudit.exclusiveSession

  = (g_exclusiveAuditSession == in->sessionHandle);

    // Sign attestation structure.  A NULL signature will be returned if

    // signObject is NULL.

    return SignAttestInfo(signObject, &in->inScheme, &auditInfo,

        &in->qualifyingData, &out->auditInfo,

        &out->signature);

}

#endif // CC_GetSessionAuditDigest

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "GetCommandAuditDigest_fp.h"

#if CC_GetCommandAuditDigest  // Conditional expansion of this file

TPM_RC

TPM2_GetCommandAuditDigest(

         GetCommandAuditDigest_In    *in,            // IN: input parameter list

         GetCommandAuditDigest_Out   *out            // OUT: output parameter list

         )

{

    TPM_RC                  result;

    TPMS_ATTEST             auditInfo;

    OBJECT                 *signObject = HandleToObject(in->signHandle);

    // Input validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_GetCommandAuditDigest_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_GetCommandAuditDigest_inScheme;

    // Command Output

    // Fill in attest information common fields

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData,

         &auditInfo);

    // CommandAuditDigest specific fields

    auditInfo.type = TPM_ST_ATTEST_COMMAND_AUDIT;

    auditInfo.attested.commandAudit.digestAlg = gp.auditHashAlg;

    auditInfo.attested.commandAudit.auditCounter = gp.auditCounter;

    // Copy command audit log

    auditInfo.attested.commandAudit.auditDigest = gr.commandAuditDigest;

    CommandAuditGetDigest(&auditInfo.attested.commandAudit.commandDigest);

    // Sign attestation structure.  A NULL signature will be returned if

    // signHandle is TPM_RH_NULL.  A TPM_RC_NV_UNAVAILABLE, TPM_RC_NV_RATE,

    // TPM_RC_VALUE, TPM_RC_SCHEME or TPM_RC_ATTRIBUTES error may be returned at

    // this point

    result = SignAttestInfo(signObject, &in->inScheme, &auditInfo,

          &in->qualifyingData, &out->auditInfo,

          &out->signature);

    // Internal Data Update

    if(result == TPM_RC_SUCCESS && in->signHandle != TPM_RH_NULL)

  // Reset log

  gr.commandAuditDigest.t.size = 0;

    return result;

}

#endif // CC_GetCommandAuditDigest

#include "Tpm.h"

#include "Attest_spt_fp.h"

#include "GetTime_fp.h"

#if CC_GetTime  // Conditional expansion of this file

TPM_RC

TPM2_GetTime(

       GetTime_In      *in,            // IN: input parameter list

       GetTime_Out     *out            // OUT: output parameter list

       )

{

    TPMS_ATTEST             timeInfo;

    OBJECT                 *signObject = HandleToObject(in->signHandle);

    // Input Validation

    if(!IsSigningObject(signObject))

  return TPM_RCS_KEY + RC_GetTime_signHandle;

    if(!CryptSelectSignScheme(signObject, &in->inScheme))

  return TPM_RCS_SCHEME + RC_GetTime_inScheme;

    // Command Output

    // Fill in attest common fields

    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData, &timeInfo);

    // GetClock specific fields

    timeInfo.type = TPM_ST_ATTEST_TIME;

    timeInfo.attested.time.time.time = g_time;

    TimeFillInfo(&timeInfo.attested.time.time.clockInfo);

    // Firmware version in plain text

    timeInfo.attested.time.firmwareVersion

  = (((UINT64)gp.firmwareV1) << 32) + gp.firmwareV2;

    // Sign attestation structure.  A NULL signature will be returned if

    // signObject is NULL.

    return SignAttestInfo(signObject, &in->inScheme, &timeInfo, &in->qualifyingData,

        &out->timeInfo, &out->signature);

}

#endif // CC_GetTime

#include "Tpm.h"

#include "CertifyX509_fp.h"

#include "X509.h"

#include "TpmASN1_fp.h"

#include "X509_spt_fp.h"

#include "Attest_spt_fp.h"

#if CC_CertifyX509 // Conditional expansion of this file

#if CERTIFYX509_DEBUG

#  include "tpm_to_platform_interface.h"

#endif

/* Error Returns  Meaning*/

/* TPM_RC_ATTRIBUTES  the attributes of objectHandle are not compatible with the KeyUsage() or TPMA_OBJECT values in the extensions fields */

/* TPM_RC_BINDING the public and private portions of the key are not properly bound. */

/* TPM_RC_HASH  the hash algorithm in the scheme is not supported */

/* TPM_RC_KEY signHandle does not reference a signing key; */

/* TPM_RC_SCHEME  the scheme is not compatible with sign key type, or input scheme is not compatible with default scheme, or the chosen scheme is not a valid sign scheme */

    /* TPM_RC_VALUE most likely a problem with the format of partialCertificate */

TPM_RC

TPM2_CertifyX509(

     CertifyX509_In          *in,          // IN: input parameter list

     CertifyX509_Out         *out            // OUT: output parameter list

     )

{

    TPM_RC                   result;

    OBJECT                  *signKey = HandleToObject(in->signHandle);

    OBJECT                  *object = HandleToObject(in->objectHandle);

    HASH_STATE               hash;

    INT16                    length;        // length for a tagged element

    ASN1UnmarshalContext     ctx;

    ASN1MarshalContext       ctxOut;

    // certTBS holds an array of pointers and lengths. Each entry references the

    // corresponding value in a TBSCertificate structure. For example, the 1th

    // element references the version number

    stringRef                certTBS[REF_COUNT] = {{0}};

#define ALLOWED_SEQUENCES   (SUBJECT_PUBLIC_KEY_REF - SIGNATURE_REF)

    stringRef                partial[ALLOWED_SEQUENCES] = {{0}};

    INT16                    countOfSequences = 0;

    INT16                    i;

    //

#if CERTIFYX509_DEBUG

    DebugFileInit();

    DebugDumpBuffer(in->partialCertificate.t.size, in->partialCertificate.t.buffer,

        "partialCertificate");

#endif

    // Input Validation

    if(in->reserved.b.size != 0)

  return TPM_RC_SIZE + RC_CertifyX509_reserved;

    // signing key must be able to sign

    if(!IsSigningObject(signKey))

  return TPM_RCS_KEY + RC_CertifyX509_signHandle;

    // Pick a scheme for sign.  If the input sign scheme is not compatible with

    // the default scheme, return an error.

    if(!CryptSelectSignScheme(signKey, &in->inScheme))

  return TPM_RCS_SCHEME + RC_CertifyX509_inScheme;

    // Make sure that the public Key encoding is known

    if(X509AddPublicKey(NULL, object) == 0)

  return TPM_RCS_ASYMMETRIC + RC_CertifyX509_objectHandle;

    // Unbundle 'partialCertificate'.

    // Initialize the unmarshaling context

    if(!ASN1UnmarshalContextInitialize(&ctx, in->partialCertificate.t.size,

               in->partialCertificate.t.buffer))

  return TPM_RCS_VALUE + RC_CertifyX509_partialCertificate;

    // Make sure that this is a constructed SEQUENCE

    length = ASN1NextTag(&ctx);

    // Must be a constructed SEQUENCE that uses all of the input parameter

    if((ctx.tag != (ASN1_CONSTRUCTED_SEQUENCE))

       || ((ctx.offset + length) != in->partialCertificate.t.size))

  return TPM_RCS_SIZE + RC_CertifyX509_partialCertificate;

    // This scans through the contents of the outermost SEQUENCE. This would be the

    // 'issuer', 'validity', 'subject', 'issuerUniqueID' (optional),

    // 'subjectUniqueID' (optional), and 'extensions.'

    while(ctx.offset < ctx.size)

  {

      INT16           startOfElement = ctx.offset;

      //

      // Read the next tag and length field.

      length = ASN1NextTag(&ctx);

      if(length < 0)

    break;

      if(ctx.tag == ASN1_CONSTRUCTED_SEQUENCE)

          {

              partial[countOfSequences].buf = &ctx.buffer[startOfElement];

              ctx.offset += length;

              partial[countOfSequences].len = (INT16)ctx.offset - startOfElement;

              if(++countOfSequences > ALLOWED_SEQUENCES)

                  break;

          }

      else if(ctx.tag  == X509_EXTENSIONS)

          {

              if(certTBS[EXTENSIONS_REF].len != 0)

                  return TPM_RCS_VALUE + RC_CertifyX509_partialCertificate;

              certTBS[EXTENSIONS_REF].buf = &ctx.buffer[startOfElement];

              ctx.offset += length;

              certTBS[EXTENSIONS_REF].len =

                  (INT16)ctx.offset - startOfElement;

          }

      else

    return TPM_RCS_VALUE + RC_CertifyX509_partialCertificate;

  }

    // Make sure that we used all of the data and found at least the required

    // number of elements.

    if((ctx.offset != ctx.size) || (countOfSequences < 3)

       || (countOfSequences > 4)

       || (certTBS[EXTENSIONS_REF].buf == NULL))

  return TPM_RCS_VALUE + RC_CertifyX509_partialCertificate;

    // Now that we know how many sequences there were, we can put them where they

    // belong

    for(i = 0; i < countOfSequences; i++)

  certTBS[SUBJECT_KEY_REF - i] = partial[countOfSequences - 1 - i];

    // If only three SEQUENCES, then the TPM needs to produce the signature algorithm.

    // See if it can

    if((countOfSequences == 3) &&

       (X509AddSigningAlgorithm(NULL, signKey, &in->inScheme) == 0))

  return TPM_RCS_SCHEME + RC_CertifyX509_signHandle;

    // Process the extensions

    result = X509ProcessExtensions(object, &certTBS[EXTENSIONS_REF]);

    if(result != TPM_RC_SUCCESS)

  // If the extension has the TPMA_OBJECT extension and the attributes don't

  // match, then the error code will be TPM_RCS_ATTRIBUTES. Otherwise, the error

  // indicates a malformed partialCertificate.

  return result + ((result == TPM_RCS_ATTRIBUTES)

       ? RC_CertifyX509_objectHandle

       : RC_CertifyX509_partialCertificate);

    // Command Output

    // Create the addedToCertificate values

    // Build the addedToCertificate from the bottom up.

    // Initialize the context structure

    ASN1InitialializeMarshalContext(&ctxOut, sizeof(out->addedToCertificate.t.buffer),

            out->addedToCertificate.t.buffer);

    // Place a marker for the overall context

    ASN1StartMarshalContext(&ctxOut);  // SEQUENCE for addedToCertificate

    // Add the subject public key descriptor

    certTBS[SUBJECT_PUBLIC_KEY_REF].len = X509AddPublicKey(&ctxOut, object);

    certTBS[SUBJECT_PUBLIC_KEY_REF].buf = ctxOut.buffer + ctxOut.offset;

    // If the caller didn't provide the algorithm identifier, create it

    if(certTBS[SIGNATURE_REF].len == 0)

  {

      certTBS[SIGNATURE_REF].len = X509AddSigningAlgorithm(&ctxOut, signKey,

                 &in->inScheme);

      certTBS[SIGNATURE_REF].buf = ctxOut.buffer + ctxOut.offset;

  }

    // Create the serial number value. Use the out->tbsDigest as scratch.

    {

  TPM2B                   *digest = &out->tbsDigest.b;

  //

  digest->size = (INT16)CryptHashStart(&hash, signKey->publicArea.nameAlg);

  pAssert(digest->size != 0);

  // The serial number size is the smaller of the digest and the vendor-defined

  // value

  digest->size = MIN(digest->size, SIZE_OF_X509_SERIAL_NUMBER);

  // Add all the parts of the certificate other than the serial number

  // and version number

  for(i = SIGNATURE_REF; i < REF_COUNT; i++)

      CryptDigestUpdate(&hash, certTBS[i].len, certTBS[i].buf);

  // throw in the Name of the signing key...

  CryptDigestUpdate2B(&hash, &signKey->name.b);

  // ...and the Name of the signed key.

  CryptDigestUpdate2B(&hash, &object->name.b);

  // Done

  CryptHashEnd2B(&hash, digest);

    }

    // Add the serial number

    certTBS[SERIAL_NUMBER_REF].len =

  ASN1PushInteger(&ctxOut, out->tbsDigest.t.size, out->tbsDigest.t.buffer);

    certTBS[SERIAL_NUMBER_REF].buf = ctxOut.buffer + ctxOut.offset;

    // Add the static version number

    ASN1StartMarshalContext(&ctxOut);

    ASN1PushUINT(&ctxOut, 2);

    certTBS[VERSION_REF].len =

  ASN1EndEncapsulation(&ctxOut, ASN1_APPLICAIION_SPECIFIC);

    certTBS[VERSION_REF].buf = ctxOut.buffer + ctxOut.offset;

    // Create a fake tag and length for the TBS in the space used for

    // 'addedToCertificate'

    {

  for(length = 0, i = 0; i < REF_COUNT; i++)

      length += certTBS[i].len;

  // Put a fake tag and length into the buffer for use in the tbsDigest

  certTBS[ENCODED_SIZE_REF].len =

      ASN1PushTagAndLength(&ctxOut, ASN1_CONSTRUCTED_SEQUENCE, length);

  certTBS[ENCODED_SIZE_REF].buf = ctxOut.buffer + ctxOut.offset;

  // Restore the buffer pointer to add back the number of octets used for the

  // tag and length

  ctxOut.offset += certTBS[ENCODED_SIZE_REF].len;

    }

    // sanity check

    if(ctxOut.offset < 0)

  return TPM_RC_FAILURE;

    // Create the tbsDigest to sign

    out->tbsDigest.t.size = CryptHashStart(&hash, in->inScheme.details.any.hashAlg);

    for(i = 0; i < REF_COUNT; i++)

  CryptDigestUpdate(&hash, certTBS[i].len, certTBS[i].buf);

    CryptHashEnd2B(&hash, &out->tbsDigest.b);

#if CERTIFYX509_DEBUG

    {

  BYTE                 fullTBS[4096];

  BYTE                *fill = fullTBS;

  int                  j;

  for (j = 0; j < REF_COUNT; j++)

      {

    MemoryCopy(fill, certTBS[j].buf, certTBS[j].len);

    fill += certTBS[j].len;

      }

  DebugDumpBuffer((int)(fill - &fullTBS[0]), fullTBS, "\nfull TBS");

    }

#endif

    // Finish up the processing of addedToCertificate

    // Create the actual tag and length for the addedToCertificate structure

    out->addedToCertificate.t.size =

  ASN1EndEncapsulation(&ctxOut, ASN1_CONSTRUCTED_SEQUENCE);

    // Now move all the addedToContext to the start of the buffer

    MemoryCopy(out->addedToCertificate.t.buffer, ctxOut.buffer + ctxOut.offset,

         out->addedToCertificate.t.size);

#if CERTIFYX509_DEBUG

    DebugDumpBuffer(out->addedToCertificate.t.size, out->addedToCertificate.t.buffer,

        "\naddedToCertificate");

#endif

    // only thing missing is the signature

    result = CryptSign(signKey, &in->inScheme, &out->tbsDigest, &out->signature);

    return result;

}

#endif // CC_CertifyX509