There are two different TPM standards. U-Boot supports both but each has its own set of functions. We really need a single TPM API that can call one or the other. This is not always possible as there are some differences between the two standards, but it is mostly possible.
Add an API to handle this. So far it is not plumbed into the build and only supports TPMv1.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
include/tpm_api.h | 322 ++++++++++++++++++++++++++++++++++++++++++++++ lib/tpm_api.c | 215 +++++++++++++++++++++++++++++++ 2 files changed, 537 insertions(+) create mode 100644 include/tpm_api.h create mode 100644 lib/tpm_api.c
diff --git a/include/tpm_api.h b/include/tpm_api.h new file mode 100644 index 00000000000..f13d98cae47 --- /dev/null +++ b/include/tpm_api.h @@ -0,0 +1,322 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2013 The Chromium OS Authors. + * Coypright (c) 2013 Guntermann & Drunck GmbH + */ + +#ifndef __TPM_API_H +#define __TPM_API_H + +#include <tpm-common.h> +#include <tpm-v1.h> +#include <tpm-v2.h> + +/** + * Issue a TPM_Startup command. + * + * @param dev TPM device + * @param mode TPM startup mode + * @return return code of the operation + */ +u32 tpm_startup(struct udevice *dev, enum tpm_startup_type mode); + +/** + * Issue a TPM_SelfTestFull command. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_self_test_full(struct udevice *dev); + +/** + * Issue a TPM_ContinueSelfTest command. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_continue_self_test(struct udevice *dev); + +/** + * Issue a TPM_NV_DefineSpace command. The implementation is limited + * to specify TPM_NV_ATTRIBUTES and size of the area. The area index + * could be one of the special value listed in enum tpm_nv_index. + * + * @param dev TPM device + * @param index index of the area + * @param perm TPM_NV_ATTRIBUTES of the area + * @param size size of the area + * @return return code of the operation + */ +u32 tpm_nv_define_space(struct udevice *dev, u32 index, u32 perm, u32 size); + +/** + * Issue a TPM_NV_ReadValue command. This implementation is limited + * to read the area from offset 0. The area index could be one of + * the special value listed in enum tpm_nv_index. + * + * @param dev TPM device + * @param index index of the area + * @param data output buffer of the area contents + * @param count size of output buffer + * @return return code of the operation + */ +u32 tpm_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count); + +/** + * Issue a TPM_NV_WriteValue command. This implementation is limited + * to write the area from offset 0. The area index could be one of + * the special value listed in enum tpm_nv_index. + * + * @param dev TPM device + * @param index index of the area + * @param data input buffer to be wrote to the area + * @param length length of data bytes of input buffer + * @return return code of the operation + */ +u32 tpm_nv_write_value(struct udevice *dev, u32 index, const void *data, + u32 length); + +/** + * Issue a TPM_Extend command. + * + * @param dev TPM device + * @param index index of the PCR + * @param in_digest 160-bit value representing the event to be + * recorded + * @param out_digest 160-bit PCR value after execution of the + * command + * @return return code of the operation + */ +u32 tpm_pcr_extend(struct udevice *dev, u32 index, const void *in_digest, + void *out_digest); + +/** + * Issue a TPM_PCRRead command. + * + * @param dev TPM device + * @param index index of the PCR + * @param data output buffer for contents of the named PCR + * @param count size of output buffer + * @return return code of the operation + */ +u32 tpm_pcr_read(struct udevice *dev, u32 index, void *data, size_t count); + +/** + * Issue a TSC_PhysicalPresence command. TPM physical presence flag + * is bit-wise OR'ed of flags listed in enum tpm_physical_presence. + * + * @param dev TPM device + * @param presence TPM physical presence flag + * @return return code of the operation + */ +u32 tpm_tsc_physical_presence(struct udevice *dev, u16 presence); + +/** + * Issue a TPM_ReadPubek command. + * + * @param dev TPM device + * @param data output buffer for the public endorsement key + * @param count size of output buffer + * @return return code of the operation + */ +u32 tpm_read_pubek(struct udevice *dev, void *data, size_t count); + +/** + * Issue a TPM_ForceClear command. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_force_clear(struct udevice *dev); + +/** + * Issue a TPM_PhysicalEnable command. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_physical_enable(struct udevice *dev); + +/** + * Issue a TPM_PhysicalDisable command. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_physical_disable(struct udevice *dev); + +/** + * Issue a TPM_PhysicalSetDeactivated command. + * + * @param dev TPM device + * @param state boolean state of the deactivated flag + * @return return code of the operation + */ +u32 tpm_physical_set_deactivated(struct udevice *dev, u8 state); + +/** + * Issue a TPM_GetCapability command. This implementation is limited + * to query sub_cap index that is 4-byte wide. + * + * @param dev TPM device + * @param cap_area partition of capabilities + * @param sub_cap further definition of capability, which is + * limited to be 4-byte wide + * @param cap output buffer for capability information + * @param count size of output buffer + * @return return code of the operation + */ +u32 tpm_get_capability(struct udevice *dev, u32 cap_area, u32 sub_cap, + void *cap, size_t count); + +/** + * Issue a TPM_FlushSpecific command for a AUTH resource. + * + * @param dev TPM device + * @param auth_handle handle of the auth session + * @return return code of the operation + */ +u32 tpm_terminate_auth_session(struct udevice *dev, u32 auth_handle); + +/** + * Issue a TPM_OIAP command to setup an object independent authorization + * session. + * Information about the session is stored internally. + * If there was already an OIAP session active it is terminated and a new + * session is set up. + * + * @param dev TPM device + * @param auth_handle pointer to the (new) auth handle or NULL. + * @return return code of the operation + */ +u32 tpm_oiap(struct udevice *dev, u32 *auth_handle); + +/** + * Ends an active OIAP session. + * + * @param dev TPM device + * @return return code of the operation + */ +u32 tpm_end_oiap(struct udevice *dev); + +/** + * Issue a TPM_LoadKey2 (Auth1) command using an OIAP session for authenticating + * the usage of the parent key. + * + * @param dev TPM device + * @param parent_handle handle of the parent key. + * @param key pointer to the key structure (TPM_KEY or TPM_KEY12). + * @param key_length size of the key structure + * @param parent_key_usage_auth usage auth for the parent key + * @param key_handle pointer to the key handle + * @return return code of the operation + */ +u32 tpm_load_key2_oiap(struct udevice *dev, u32 parent_handle, const void *key, + size_t key_length, const void *parent_key_usage_auth, + u32 *key_handle); + +/** + * Issue a TPM_GetPubKey (Auth1) command using an OIAP session for + * authenticating the usage of the key. + * + * @param dev TPM device + * @param key_handle handle of the key + * @param usage_auth usage auth for the key + * @param pubkey pointer to the pub key buffer; may be NULL if the pubkey + * should not be stored. + * @param pubkey_len pointer to the pub key buffer len. On entry: the size of + * the provided pubkey buffer. On successful exit: the size + * of the stored TPM_PUBKEY structure (iff pubkey != NULL). + * @return return code of the operation + */ +u32 tpm_get_pub_key_oiap(struct udevice *dev, u32 key_handle, + const void *usage_auth, void *pubkey, + size_t *pubkey_len); + +/** + * Get the TPM permissions + * + * @param dev TPM device + * @param perm Returns permissions value + * @return return code of the operation + */ +u32 tpm_get_permissions(struct udevice *dev, u32 index, u32 *perm); + +/** + * Flush a resource with a given handle and type from the TPM + * + * @param dev TPM device + * @param key_handle handle of the resource + * @param resource_type type of the resource + * @return return code of the operation + */ +u32 tpm_flush_specific(struct udevice *dev, u32 key_handle, u32 resource_type); + +#ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1 +/** + * Search for a key by usage AuthData and the hash of the parent's pub key. + * + * @param dev TPM device + * @param auth Usage auth of the key to search for + * @param pubkey_digest SHA1 hash of the pub key structure of the key + * @param[out] handle The handle of the key (Non-null iff found) + * @return 0 if key was found in TPM; != 0 if not. + */ +u32 tpm_find_key_sha1(struct udevice *dev, const u8 auth[20], + const u8 pubkey_digest[20], u32 *handle); +#endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */ + +/** + * Read random bytes from the TPM RNG. The implementation deals with the fact + * that the TPM may legally return fewer bytes than requested by retrying + * until @p count bytes have been received. + * + * @param dev TPM device + * @param data output buffer for the random bytes + * @param count size of output buffer + * @return return code of the operation + */ +u32 tpm_get_random(struct udevice *dev, void *data, u32 count); + +/** + * tpm_finalise_physical_presence() - Finalise physical presence + * + * @param dev TPM device + * @return return code of the operation (0 = success) + */ +u32 tpm_finalise_physical_presence(struct udevice *dev); + +/** + * tpm_nv_enable_locking() - lock the non-volatile space + * + * @param dev TPM device + * @return return code of the operation (0 = success) + */ +u32 tpm_nv_enable_locking(struct udevice *dev); + +/** + * tpm_set_global_lock() - set the global lock + * + * @param dev TPM device + * @return return code of the operation (0 = success) + */ +u32 tpm_set_global_lock(struct udevice *dev); + +/** + * tpm_write_lock() - lock the non-volatile space + * + * @param dev TPM device + * @param index Index of space to lock + * @return return code of the operation (0 = success) + */ +u32 tpm_write_lock(struct udevice *dev, u32 index); + +/** + * tpm_resume() - start up the TPM from resume (after suspend) + * + * @param dev TPM device + * @return return code of the operation (0 = success) + */ +u32 tpm_resume(struct udevice *dev); + +#endif /* __TPM_API_H */ diff --git a/lib/tpm_api.c b/lib/tpm_api.c new file mode 100644 index 00000000000..758350bd18d --- /dev/null +++ b/lib/tpm_api.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2019 Google LLC + */ + +#include <common.h> +#include <dm.h> +#include <log.h> +#include <tpm_api.h> +#include <tpm-v1.h> +#include <tpm-v2.h> +#include <tpm_api.h> + +static bool is_tpm1(struct udevice *dev) +{ + return IS_ENABLED(CONFIG_TPM_V1) && tpm_get_version(dev) == TPM_V1; +} + +u32 tpm_startup(struct udevice *dev, enum tpm_startup_type mode) +{ + if (is_tpm1(dev)) + return tpm1_startup(dev, mode); + else + return -ENOSYS; +} + +u32 tpm_resume(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_startup(dev, TPM_ST_STATE); + else + return -ENOSYS; +} + +u32 tpm_self_test_full(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_self_test_full(dev); + else + return -ENOSYS; +} + +u32 tpm_continue_self_test(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_continue_self_test(dev); + else + return -ENOSYS; +} + +u32 tpm_clear_and_reenable(struct udevice *dev) +{ + u32 ret; + + log_info("TPM: Clear and re-enable\n"); + ret = tpm_force_clear(dev); + if (ret != TPM_SUCCESS) { + log_err("Can't initiate a force clear\n"); + return ret; + } + + if (is_tpm1(dev)) { + ret = tpm1_physical_enable(dev); + if (ret != TPM_SUCCESS) { + log_err("TPM: Can't set enabled state\n"); + return ret; + } + + ret = tpm1_physical_set_deactivated(dev, 0); + if (ret != TPM_SUCCESS) { + log_err("TPM: Can't set deactivated state\n"); + return ret; + } + } else { + return -ENOSYS; + } + + return TPM_SUCCESS; +} + +u32 tpm_nv_enable_locking(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_nv_define_space(dev, TPM_NV_INDEX_LOCK, 0, 0); + else + return -ENOSYS; +} + +u32 tpm_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count) +{ + if (is_tpm1(dev)) + return tpm1_nv_read_value(dev, index, data, count); + else + return -ENOSYS; +} + +u32 tpm_nv_write_value(struct udevice *dev, u32 index, const void *data, + u32 count) +{ + if (is_tpm1(dev)) + return tpm1_nv_write_value(dev, index, data, count); + else + return -ENOSYS; +} + +u32 tpm_set_global_lock(struct udevice *dev) +{ + return tpm_nv_write_value(dev, TPM_NV_INDEX_0, NULL, 0); +} + +u32 tpm_write_lock(struct udevice *dev, u32 index) +{ + if (is_tpm1(dev)) + return -ENOSYS; + else + return -ENOSYS; +} + +u32 tpm_pcr_extend(struct udevice *dev, u32 index, const void *in_digest, + void *out_digest) +{ + if (is_tpm1(dev)) + return tpm1_extend(dev, index, in_digest, out_digest); + else + return -ENOSYS; +} + +u32 tpm_pcr_read(struct udevice *dev, u32 index, void *data, size_t count) +{ + if (is_tpm1(dev)) + return tpm1_pcr_read(dev, index, data, count); + else + return -ENOSYS; +} + +u32 tpm_tsc_physical_presence(struct udevice *dev, u16 presence) +{ + if (is_tpm1(dev)) + return tpm1_tsc_physical_presence(dev, presence); + else + return -ENOSYS; +} + +u32 tpm_finalise_physical_presence(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_finalise_physical_presence(dev); + else + return -ENOSYS; +} + +u32 tpm_read_pubek(struct udevice *dev, void *data, size_t count) +{ + if (is_tpm1(dev)) + return tpm1_read_pubek(dev, data, count); + else + return -ENOSYS; /* not implemented yet */ +} + +u32 tpm_force_clear(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_force_clear(dev); + else + return -ENOSYS; +} + +u32 tpm_physical_enable(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_physical_enable(dev); + else + return -ENOSYS; +} + +u32 tpm_physical_disable(struct udevice *dev) +{ + if (is_tpm1(dev)) + return tpm1_physical_disable(dev); + else + return -ENOSYS; +} + +u32 tpm_physical_set_deactivated(struct udevice *dev, u8 state) +{ + if (is_tpm1(dev)) + return tpm1_physical_set_deactivated(dev, state); + else + return -ENOSYS; +} + +u32 tpm_get_capability(struct udevice *dev, u32 cap_area, u32 sub_cap, + void *cap, size_t count) +{ + if (is_tpm1(dev)) + return tpm1_get_capability(dev, cap_area, sub_cap, cap, count); + else + return -ENOSYS; +} + +u32 tpm_get_permissions(struct udevice *dev, u32 index, u32 *perm) +{ + if (is_tpm1(dev)) + return tpm1_get_permissions(dev, index, perm); + else + return -ENOSYS; /* not implemented yet */ +} + +u32 tpm_get_random(struct udevice *dev, void *data, u32 count) +{ + if (is_tpm1(dev)) + return tpm1_get_random(dev, data, count); + else + return -ENOSYS; /* not implemented yet */ +}