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/* SPDX-License-Identifier: BSD-3-Clause */
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "tpm2.h"
#include "tpm2_capability.h"
#define APPEND_CAPABILITY_INFORMATION(capability, field, subfield, max_count) \
if (fetched_data->data.capability.count > max_count - property_count) { \
fetched_data->data.capability.count = max_count - property_count; \
} \
\
memmove(&(*capability_data)->data.capability.field[property_count], \
fetched_data->data.capability.field, \
fetched_data->data.capability.count * sizeof(fetched_data->data.capability.field[0])); \
property_count += fetched_data->data.capability.count; \
\
(*capability_data)->data.capability.count = property_count; \
\
if (more_data && property_count < count && fetched_data->data.capability.count) { \
property = (*capability_data)->data.capability.field[property_count - 1]subfield + 1; \
} else { \
more_data = false; \
}
tool_rc tpm2_capability_get_ex(ESYS_CONTEXT *ectx, TPM2_CAP capability,
UINT32 property, UINT32 count, bool ignore_more_data,
TPMS_CAPABILITY_DATA **capability_data) {
TPMI_YES_NO more_data = 0;
UINT32 property_count = 0;
*capability_data = NULL;
do {
/* fetch capability info */
TPMS_CAPABILITY_DATA *fetched_data = NULL;
tool_rc rc = tpm2_get_capability(ectx, ESYS_TR_NONE, ESYS_TR_NONE,
ESYS_TR_NONE, capability, property, count - property_count,
&more_data, &fetched_data);
LOG_INFO("GetCapability: capability: 0x%x, property: 0x%x", capability,
property);
if (rc != tool_rc_success) {
if (*capability_data) {
free(*capability_data);
*capability_data = NULL;
}
return rc;
}
if (fetched_data->capability != capability) {
LOG_ERR("TPM returned different capability than requested: 0x%x != "
"0x%x", fetched_data->capability, capability);
free(fetched_data);
if (*capability_data) {
free(*capability_data);
*capability_data = NULL;
}
return tool_rc_general_error;
}
if (*capability_data == NULL) {
/* reuse the TPM's result structure */
*capability_data = fetched_data;
if (!more_data || ignore_more_data) {
/* there won't be another iteration of the loop, just return the result unmodified */
return tool_rc_success;
}
}
/* append the TPM's results to the initial structure, as long as there is still space left */
switch (capability) {
case TPM2_CAP_ALGS:
APPEND_CAPABILITY_INFORMATION(algorithms, algProperties, .alg,
TPM2_MAX_CAP_ALGS);
break;
case TPM2_CAP_HANDLES:
APPEND_CAPABILITY_INFORMATION(handles, handle,,
TPM2_MAX_CAP_HANDLES);
break;
case TPM2_CAP_COMMANDS:
APPEND_CAPABILITY_INFORMATION(command, commandAttributes,,
TPM2_MAX_CAP_CC);
/* workaround because tpm2-tss does not implement attribute commandIndex for TPMA_CC */
property &= TPMA_CC_COMMANDINDEX_MASK;
break;
case TPM2_CAP_PP_COMMANDS:
APPEND_CAPABILITY_INFORMATION(ppCommands, commandCodes,,
TPM2_MAX_CAP_CC);
break;
case TPM2_CAP_AUDIT_COMMANDS:
APPEND_CAPABILITY_INFORMATION(auditCommands, commandCodes,,
TPM2_MAX_CAP_CC);
break;
case TPM2_CAP_PCRS:
APPEND_CAPABILITY_INFORMATION(assignedPCR, pcrSelections, .hash,
TPM2_NUM_PCR_BANKS);
break;
case TPM2_CAP_TPM_PROPERTIES:
APPEND_CAPABILITY_INFORMATION(tpmProperties, tpmProperty, .property,
TPM2_MAX_TPM_PROPERTIES);
break;
case TPM2_CAP_PCR_PROPERTIES:
APPEND_CAPABILITY_INFORMATION(pcrProperties, pcrProperty, .tag,
TPM2_MAX_PCR_PROPERTIES);
break;
case TPM2_CAP_ECC_CURVES:
APPEND_CAPABILITY_INFORMATION(eccCurves, eccCurves,,
TPM2_MAX_ECC_CURVES);
break;
default:
LOG_ERR("Unsupported capability with moreData True,"
"try with option -i, got: 0x%x\n", capability);
if (fetched_data != *capability_data) {
free(fetched_data);
}
free(*capability_data);
*capability_data = NULL;
return tool_rc_general_error;
}
if (fetched_data != *capability_data) {
free(fetched_data);
}
} while (more_data);
return tool_rc_success;
}
tool_rc tpm2_capability_get(ESYS_CONTEXT *ectx, TPM2_CAP capability,
UINT32 property, UINT32 count,
TPMS_CAPABILITY_DATA **capability_data) {
return tpm2_capability_get_ex(ectx, capability,
property, count, false, capability_data);
}
tool_rc tpm2_capability_find_vacant_persistent_handle(ESYS_CONTEXT *ctx,
bool is_platform, TPMI_DH_PERSISTENT *vacant) {
TPMS_CAPABILITY_DATA *capability_data;
bool handle_found = false;
tool_rc rc = tpm2_capability_get(ctx, TPM2_CAP_HANDLES,
TPM2_PERSISTENT_FIRST, TPM2_MAX_CAP_HANDLES, &capability_data);
if (rc != tool_rc_success) {
return rc;
}
UINT32 count = capability_data->data.handles.count;
if (count == 0) {
/* There aren't any persistent handles, so use the first */
*vacant = is_platform ? TPM2_PLATFORM_PERSISTENT : TPM2_PERSISTENT_FIRST;
handle_found = true;
} else if (count == TPM2_MAX_CAP_HANDLES) {
/* All persistent handles are already in use */
goto out;
} else if (count < TPM2_MAX_CAP_HANDLES) {
/*
* iterate over used handles to ensure we're selecting
* the next available handle.
*
* Platform handles start at a higher hange
*/
UINT32 i;
for (i = is_platform ? TPM2_PLATFORM_PERSISTENT : TPM2_PERSISTENT_FIRST;
i <= (UINT32) TPM2_PERSISTENT_LAST; ++i) {
bool inuse = false;
UINT32 c;
for (c = 0; c < count; ++c) {
if (capability_data->data.handles.handle[c] == i) {
inuse = true;
break;
}
}
if (!is_platform && i >= TPM2_PLATFORM_PERSISTENT) {
break;
}
if (!inuse) {
*vacant = i;
handle_found = true;
break;
}
}
}
out:
free(capability_data);
return handle_found ? tool_rc_success : tool_rc_general_error;
}
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