src/tss2-sys/api/Tss2_Sys_StartAuthSession.c

/* SPDX-License-Identifier: BSD-2-Clause */
/***********************************************************************;
 * Copyright (c) 2015 - 2017, Intel Corporation
 * All rights reserved.
 ***********************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "tss2_tpm2_types.h"
#include "tss2_mu.h"
#include "sysapi_util.h"

TSS2_RC Tss2_Sys_StartAuthSession_Prepare(
    TSS2_SYS_CONTEXT *sysContext,
    TPMI_DH_OBJECT tpmKey,
    TPMI_DH_ENTITY bind,
    const TPM2B_NONCE *nonceCaller,
    const TPM2B_ENCRYPTED_SECRET *encryptedSalt,
    TPM2_SE sessionType,
    const TPMT_SYM_DEF *symmetric,
    TPMI_ALG_HASH authHash)
{
    _TSS2_SYS_CONTEXT_BLOB *ctx = syscontext_cast(sysContext);
    TSS2_RC rval;

    if (!ctx || !symmetric)
        return TSS2_SYS_RC_BAD_REFERENCE;

    if (IsAlgorithmWeak(authHash, 0))
        return TSS2_SYS_RC_BAD_VALUE;

    rval = CommonPreparePrologue(ctx, TPM2_CC_StartAuthSession);
    if (rval)
        return rval;

    rval = Tss2_MU_UINT32_Marshal(tpmKey, ctx->cmdBuffer,
                                  ctx->maxCmdSize,
                                  &ctx->nextData);
    if (rval)
        return rval;

    rval = Tss2_MU_UINT32_Marshal(bind, ctx->cmdBuffer,
                                  ctx->maxCmdSize,
                                  &ctx->nextData);
    if (rval)
        return rval;

    if (!nonceCaller) {
        ctx->decryptNull = 1;

        rval = Tss2_MU_UINT16_Marshal(0, ctx->cmdBuffer,
                                      ctx->maxCmdSize,
                                      &ctx->nextData);
    } else {

        rval = Tss2_MU_TPM2B_NONCE_Marshal(nonceCaller, ctx->cmdBuffer,
                                           ctx->maxCmdSize,
                                           &ctx->nextData);
    }

    if (rval)
        return rval;

    if (!encryptedSalt) {
        rval = Tss2_MU_UINT16_Marshal(0, ctx->cmdBuffer,
                                      ctx->maxCmdSize,
                                      &ctx->nextData);

    } else {

        rval = Tss2_MU_TPM2B_ENCRYPTED_SECRET_Marshal(encryptedSalt,
                                                      ctx->cmdBuffer,
                                                      ctx->maxCmdSize,
                                                      &ctx->nextData);
    }

    if (rval)
        return rval;

    rval = Tss2_MU_UINT8_Marshal(sessionType, ctx->cmdBuffer,
                                 ctx->maxCmdSize,
                                 &ctx->nextData);
    if (rval)
        return rval;

    rval = Tss2_MU_TPMT_SYM_DEF_Marshal(symmetric, ctx->cmdBuffer,
                                        ctx->maxCmdSize,
                                        &ctx->nextData);
    if (rval)
        return rval;

    rval = Tss2_MU_UINT16_Marshal(authHash, ctx->cmdBuffer,
                                  ctx->maxCmdSize,
                                  &ctx->nextData);
    if (rval)
        return rval;

    ctx->decryptAllowed = 1;
    ctx->encryptAllowed = 1;
    ctx->authAllowed = 1;

    return CommonPrepareEpilogue(ctx);
}

TSS2_RC Tss2_Sys_StartAuthSession_Complete(
    TSS2_SYS_CONTEXT *sysContext,
    TPMI_SH_AUTH_SESSION *sessionHandle,
    TPM2B_NONCE *nonceTPM)
{
    _TSS2_SYS_CONTEXT_BLOB *ctx = syscontext_cast(sysContext);
    TSS2_RC rval;

    if (!ctx)
        return TSS2_SYS_RC_BAD_REFERENCE;

    rval = Tss2_MU_UINT32_Unmarshal(ctx->cmdBuffer,
                                    ctx->maxCmdSize,
                                    &ctx->nextData,
                                    sessionHandle);
    if (rval)
        return rval;

    rval = CommonComplete(ctx);
    if (rval)
        return rval;

    return Tss2_MU_TPM2B_NONCE_Unmarshal(ctx->cmdBuffer,
                                         ctx->maxCmdSize,
                                         &ctx->nextData, nonceTPM);
}

TSS2_RC Tss2_Sys_StartAuthSession(
    TSS2_SYS_CONTEXT *sysContext,
    TPMI_DH_OBJECT tpmKey,
    TPMI_DH_ENTITY bind,
    TSS2L_SYS_AUTH_COMMAND const *cmdAuthsArray,
    const TPM2B_NONCE *nonceCaller,
    const TPM2B_ENCRYPTED_SECRET *encryptedSalt,
    TPM2_SE sessionType,
    const TPMT_SYM_DEF *symmetric,
    TPMI_ALG_HASH authHash,
    TPMI_SH_AUTH_SESSION *sessionHandle,
    TPM2B_NONCE *nonceTPM,
    TSS2L_SYS_AUTH_RESPONSE *rspAuthsArray)
{
    _TSS2_SYS_CONTEXT_BLOB *ctx = syscontext_cast(sysContext);
    TSS2_RC rval;

    if (!symmetric)
        return TSS2_SYS_RC_BAD_REFERENCE;

    rval = Tss2_Sys_StartAuthSession_Prepare(sysContext, tpmKey, bind, nonceCaller, encryptedSalt, sessionType, symmetric, authHash);
    if (rval)
        return rval;

    rval = CommonOneCall(ctx, cmdAuthsArray, rspAuthsArray);
    if (rval)
        return rval;

    return Tss2_Sys_StartAuthSession_Complete(sysContext, sessionHandle, nonceTPM);
}