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tpm2: add tpm2_is_encryption_session()

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This commit is contained in:
Dan Streetman 2022-12-07 11:23:59 -05:00
parent 8139407ec1
commit e976445d03
2 changed files with 17 additions and 0 deletions
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16
src/shared/tpm2-util.c
View file

@ -52,6 +52,7 @@ TSS2_RC (*sym_Esys_PolicyPCR)(ESYS_CONTEXT *esysContext, ESYS_TR policySession,
TSS2_RC (*sym_Esys_ReadPublic)(ESYS_CONTEXT *esysContext, ESYS_TR objectHandle, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, TPM2B_PUBLIC **outPublic, TPM2B_NAME **name, TPM2B_NAME **qualifiedName);
TSS2_RC (*sym_Esys_StartAuthSession)(ESYS_CONTEXT *esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE *nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF *symmetric, TPMI_ALG_HASH authHash, ESYS_TR *sessionHandle) = NULL;
TSS2_RC (*sym_Esys_Startup)(ESYS_CONTEXT *esysContext, TPM2_SU startupType) = NULL;
TSS2_RC (*sym_Esys_TRSess_GetAttributes)(ESYS_CONTEXT *esysContext, ESYS_TR session, TPMA_SESSION *flags);
TSS2_RC (*sym_Esys_TRSess_SetAttributes)(ESYS_CONTEXT *esysContext, ESYS_TR session, TPMA_SESSION flags, TPMA_SESSION mask);
TSS2_RC (*sym_Esys_TR_GetName)(ESYS_CONTEXT *esysContext, ESYS_TR handle, TPM2B_NAME **name);
TSS2_RC (*sym_Esys_TR_Deserialize)(ESYS_CONTEXT *esys_context, uint8_t const *buffer, size_t buffer_size, ESYS_TR *esys_handle);
@ -93,6 +94,7 @@ int dlopen_tpm2(void) {
DLSYM_ARG(Esys_ReadPublic),
DLSYM_ARG(Esys_StartAuthSession),
DLSYM_ARG(Esys_Startup),
DLSYM_ARG(Esys_TRSess_GetAttributes),
DLSYM_ARG(Esys_TRSess_SetAttributes),
DLSYM_ARG(Esys_TR_FromTPMPublic),
DLSYM_ARG(Esys_TR_GetName),
@ -1393,6 +1395,20 @@ static void hash_pin(const char *pin, size_t len, TPM2B_AUTH *auth) {
sha256_finish_ctx(&hash, auth->buffer);
}
static bool tpm2_is_encryption_session(Tpm2Context *c, const Tpm2Handle *session) {
TPMA_SESSION flags = 0;
TSS2_RC rc;
assert(c);
assert(session);
rc = sym_Esys_TRSess_GetAttributes(c->esys_context, session->esys_handle, &flags);
if (rc != TSS2_RC_SUCCESS)
return false;
return (flags & TPMA_SESSION_DECRYPT) && (flags & TPMA_SESSION_ENCRYPT);
}
static int tpm2_make_encryption_session(
Tpm2Context *c,
const Tpm2Handle *primary,

1
src/shared/tpm2-util.h
View file

@ -56,6 +56,7 @@ extern TSS2_RC (*sym_Esys_PolicyGetDigest)(ESYS_CONTEXT *esysContext, ESYS_TR po
extern TSS2_RC (*sym_Esys_PolicyPCR)(ESYS_CONTEXT *esysContext, ESYS_TR policySession, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_DIGEST *pcrDigest, const TPML_PCR_SELECTION *pcrs);
extern TSS2_RC (*sym_Esys_StartAuthSession)(ESYS_CONTEXT *esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE *nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF *symmetric, TPMI_ALG_HASH authHash, ESYS_TR *sessionHandle);
extern TSS2_RC (*sym_Esys_Startup)(ESYS_CONTEXT *esysContext, TPM2_SU startupType);
extern TSS2_RC (*sym_Esys_TRSess_GetAttributes)(ESYS_CONTEXT *esysContext, ESYS_TR session, TPMA_SESSION *flags);
extern TSS2_RC (*sym_Esys_TRSess_SetAttributes)(ESYS_CONTEXT *esysContext, ESYS_TR session, TPMA_SESSION flags, TPMA_SESSION mask);
extern TSS2_RC (*sym_Esys_TR_GetName)(ESYS_CONTEXT *esysContext, ESYS_TR handle, TPM2B_NAME **name);
extern TSS2_RC (*sym_Esys_TR_SetAuth)(ESYS_CONTEXT *esysContext, ESYS_TR handle, TPM2B_AUTH const *authValue);