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common/cmd_tpm.c
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/* |
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* Copyright (c) 2013 The Chromium OS Authors. |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ #include <common.h> #include <command.h> |
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#include <dm.h> |
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#include <malloc.h> |
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#include <tpm.h> |
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#include <asm/unaligned.h> #include <linux/string.h> |
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/* Useful constants */ enum { DIGEST_LENGTH = 20, /* max lengths, valid for RSA keys <= 2048 bits */ TPM_PUBKEY_MAX_LENGTH = 288, }; |
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/** * Print a byte string in hexdecimal format, 16-bytes per line. * * @param data byte string to be printed * @param count number of bytes to be printed */ static void print_byte_string(uint8_t *data, size_t count) { int i, print_newline = 0; |
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for (i = 0; i < count; i++) { printf(" %02x", data[i]); print_newline = (i % 16 == 15); if (print_newline) putc(' '); } /* Avoid duplicated newline at the end */ if (!print_newline) putc(' '); } /** * Convert a text string of hexdecimal values into a byte string. |
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* |
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* @param bytes text string of hexdecimal values with no space * between them * @param data output buffer for byte string. The caller has to make * sure it is large enough for storing the output. If * NULL is passed, a large enough buffer will be allocated, * and the caller must free it. * @param count_ptr output variable for the length of byte string * @return pointer to output buffer |
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*/ |
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static void *parse_byte_string(char *bytes, uint8_t *data, size_t *count_ptr) { char byte[3]; size_t count, length; int i; |
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if (!bytes) return NULL; |
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length = strlen(bytes); count = length / 2; if (!data) data = malloc(count); if (!data) return NULL; byte[2] = '\0'; for (i = 0; i < length; i += 2) { byte[0] = bytes[i]; byte[1] = bytes[i + 1]; data[i / 2] = (uint8_t)simple_strtoul(byte, NULL, 16); |
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} |
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if (count_ptr) *count_ptr = count; return data; } /** |
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* report_return_code() - Report any error and return failure or success |
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* * @param return_code TPM command return code * @return value of enum command_ret_t */ |
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static int report_return_code(int return_code) |
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{ |
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if (return_code) { printf("Error: %d ", return_code); |
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return CMD_RET_FAILURE; |
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} else { |
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return CMD_RET_SUCCESS; |
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} |
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} /** * Return number of values defined by a type string. * * @param type_str type string * @return number of values of type string */ static int type_string_get_num_values(const char *type_str) { return strlen(type_str); } /** * Return total size of values defined by a type string. * * @param type_str type string * @return total size of values of type string, or 0 if type string * contains illegal type character. */ static size_t type_string_get_space_size(const char *type_str) { size_t size; for (size = 0; *type_str; type_str++) { switch (*type_str) { case 'b': size += 1; break; case 'w': size += 2; break; case 'd': size += 4; break; default: return 0; } |
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} |
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return size; |
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} |
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/** * Allocate a buffer large enough to hold values defined by a type * string. The caller has to free the buffer. * * @param type_str type string * @param count pointer for storing size of buffer * @return pointer to buffer or NULL on error */ static void *type_string_alloc(const char *type_str, uint32_t *count) { void *data; size_t size; size = type_string_get_space_size(type_str); if (!size) return NULL; data = malloc(size); if (data) *count = size; |
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return data; } /** * Pack values defined by a type string into a buffer. The buffer must have * large enough space. * * @param type_str type string * @param values text strings of values to be packed * @param data output buffer of values * @return 0 on success, non-0 on error */ static int type_string_pack(const char *type_str, char * const values[], uint8_t *data) |
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{ |
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size_t offset; uint32_t value; for (offset = 0; *type_str; type_str++, values++) { value = simple_strtoul(values[0], NULL, 0); switch (*type_str) { case 'b': data[offset] = value; offset += 1; break; case 'w': put_unaligned_be16(value, data + offset); offset += 2; break; case 'd': put_unaligned_be32(value, data + offset); offset += 4; |
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break; |
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default: return -1; |
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} |
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} return 0; } /** * Read values defined by a type string from a buffer, and write these values * to environment variables. * * @param type_str type string * @param data input buffer of values * @param vars names of environment variables * @return 0 on success, non-0 on error */ static int type_string_write_vars(const char *type_str, uint8_t *data, char * const vars[]) { size_t offset; uint32_t value; for (offset = 0; *type_str; type_str++, vars++) { switch (*type_str) { case 'b': value = data[offset]; offset += 1; break; case 'w': value = get_unaligned_be16(data + offset); offset += 2; |
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break; |
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case 'd': value = get_unaligned_be32(data + offset); offset += 4; break; default: return -1; |
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} |
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if (setenv_ulong(*vars, value)) return -1; |
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} |
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return 0; |
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} |
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static int do_tpm_startup(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { enum tpm_startup_type mode; |
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if (argc != 2) return CMD_RET_USAGE; if (!strcasecmp("TPM_ST_CLEAR", argv[1])) { mode = TPM_ST_CLEAR; } else if (!strcasecmp("TPM_ST_STATE", argv[1])) { mode = TPM_ST_STATE; } else if (!strcasecmp("TPM_ST_DEACTIVATED", argv[1])) { mode = TPM_ST_DEACTIVATED; } else { printf("Couldn't recognize mode string: %s ", argv[1]); return CMD_RET_FAILURE; } |
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return report_return_code(tpm_startup(mode)); |
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} static int do_tpm_nv_define_space(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, perm, size; if (argc != 4) return CMD_RET_USAGE; index = simple_strtoul(argv[1], NULL, 0); perm = simple_strtoul(argv[2], NULL, 0); size = simple_strtoul(argv[3], NULL, 0); |
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return report_return_code(tpm_nv_define_space(index, perm, size)); |
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} |
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static int do_tpm_nv_read_value(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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uint32_t index, count, rc; void *data; |
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if (argc != 4) return CMD_RET_USAGE; index = simple_strtoul(argv[1], NULL, 0); data = (void *)simple_strtoul(argv[2], NULL, 0); count = simple_strtoul(argv[3], NULL, 0); rc = tpm_nv_read_value(index, data, count); if (!rc) { puts("area content: "); print_byte_string(data, count); |
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} |
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return report_return_code(rc); |
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} static int do_tpm_nv_write_value(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, rc; size_t count; void *data; if (argc != 3) return CMD_RET_USAGE; index = simple_strtoul(argv[1], NULL, 0); data = parse_byte_string(argv[2], NULL, &count); if (!data) { printf("Couldn't parse byte string %s ", argv[2]); return CMD_RET_FAILURE; |
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} |
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rc = tpm_nv_write_value(index, data, count); free(data); |
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return report_return_code(rc); |
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} static int do_tpm_extend(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, rc; uint8_t in_digest[20], out_digest[20]; if (argc != 3) return CMD_RET_USAGE; index = simple_strtoul(argv[1], NULL, 0); if (!parse_byte_string(argv[2], in_digest, NULL)) { printf("Couldn't parse byte string %s ", argv[2]); return CMD_RET_FAILURE; |
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} |
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rc = tpm_extend(index, in_digest, out_digest); if (!rc) { puts("PCR value after execution of the command: "); print_byte_string(out_digest, sizeof(out_digest)); |
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} |
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return report_return_code(rc); |
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} static int do_tpm_pcr_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, count, rc; void *data; if (argc != 4) return CMD_RET_USAGE; index = simple_strtoul(argv[1], NULL, 0); data = (void *)simple_strtoul(argv[2], NULL, 0); count = simple_strtoul(argv[3], NULL, 0); |
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rc = tpm_pcr_read(index, data, count); if (!rc) { puts("Named PCR content: "); print_byte_string(data, count); |
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} |
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return report_return_code(rc); |
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} |
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static int do_tpm_tsc_physical_presence(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint16_t presence; if (argc != 2) return CMD_RET_USAGE; presence = (uint16_t)simple_strtoul(argv[1], NULL, 0); |
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return report_return_code(tpm_tsc_physical_presence(presence)); |
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} static int do_tpm_read_pubek(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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uint32_t count, rc; void *data; if (argc != 3) return CMD_RET_USAGE; data = (void *)simple_strtoul(argv[1], NULL, 0); count = simple_strtoul(argv[2], NULL, 0); rc = tpm_read_pubek(data, count); if (!rc) { puts("pubek value: "); print_byte_string(data, count); } |
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return report_return_code(rc); |
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} |
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static int do_tpm_physical_set_deactivated(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint8_t state; if (argc != 2) return CMD_RET_USAGE; state = (uint8_t)simple_strtoul(argv[1], NULL, 0); |
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return report_return_code(tpm_physical_set_deactivated(state)); |
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} static int do_tpm_get_capability(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t cap_area, sub_cap, rc; void *cap; size_t count; if (argc != 5) return CMD_RET_USAGE; cap_area = simple_strtoul(argv[1], NULL, 0); sub_cap = simple_strtoul(argv[2], NULL, 0); cap = (void *)simple_strtoul(argv[3], NULL, 0); count = simple_strtoul(argv[4], NULL, 0); rc = tpm_get_capability(cap_area, sub_cap, cap, count); if (!rc) { puts("capability information: "); print_byte_string(cap, count); } |
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return report_return_code(rc); |
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} |
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#define TPM_COMMAND_NO_ARG(cmd) \ static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \ int argc, char * const argv[]) \ { \ if (argc != 1) \ return CMD_RET_USAGE; \ |
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return report_return_code(cmd()); \ |
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} TPM_COMMAND_NO_ARG(tpm_init) TPM_COMMAND_NO_ARG(tpm_self_test_full) TPM_COMMAND_NO_ARG(tpm_continue_self_test) TPM_COMMAND_NO_ARG(tpm_force_clear) TPM_COMMAND_NO_ARG(tpm_physical_enable) TPM_COMMAND_NO_ARG(tpm_physical_disable) |
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static int get_tpm(struct udevice **devp) { int rc; rc = uclass_first_device(UCLASS_TPM, devp); if (rc) { printf("Could not find TPM (ret=%d) ", rc); return CMD_RET_FAILURE; } return 0; } |
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static int do_tpm_info(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) { struct udevice *dev; char buf[80]; int rc; rc = get_tpm(&dev); if (rc) return rc; rc = tpm_get_desc(dev, buf, sizeof(buf)); if (rc < 0) { printf("Couldn't get TPM info (%d) ", rc); return CMD_RET_FAILURE; } printf("%s ", buf); return 0; } |
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static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { |
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struct udevice *dev; |
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void *command; uint8_t response[1024]; size_t count, response_length = sizeof(response); uint32_t rc; command = parse_byte_string(argv[1], NULL, &count); if (!command) { printf("Couldn't parse byte string %s ", argv[1]); return CMD_RET_FAILURE; } |
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rc = get_tpm(&dev); if (rc) return rc; rc = tpm_xfer(dev, command, count, response, &response_length); |
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free(command); if (!rc) { puts("tpm response: "); print_byte_string(response, response_length); } |
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return report_return_code(rc); |
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} static int do_tpm_nv_define(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, perm, size; if (argc != 4) return CMD_RET_USAGE; size = type_string_get_space_size(argv[1]); if (!size) { printf("Couldn't parse arguments "); return CMD_RET_USAGE; } index = simple_strtoul(argv[2], NULL, 0); perm = simple_strtoul(argv[3], NULL, 0); |
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return report_return_code(tpm_nv_define_space(index, perm, size)); |
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} static int do_tpm_nv_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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uint32_t index, count, err; void *data; |
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if (argc < 3) return CMD_RET_USAGE; if (argc != 3 + type_string_get_num_values(argv[1])) return CMD_RET_USAGE; index = simple_strtoul(argv[2], NULL, 0); data = type_string_alloc(argv[1], &count); if (!data) { printf("Couldn't parse arguments "); return CMD_RET_USAGE; |
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} |
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err = tpm_nv_read_value(index, data, count); if (!err) { if (type_string_write_vars(argv[1], data, argv + 3)) { printf("Couldn't write to variables "); err = ~0; } |
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} |
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free(data); |
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return report_return_code(err); |
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} static int do_tpm_nv_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t index, count, err; void *data; if (argc < 3) return CMD_RET_USAGE; if (argc != 3 + type_string_get_num_values(argv[1])) return CMD_RET_USAGE; index = simple_strtoul(argv[2], NULL, 0); data = type_string_alloc(argv[1], &count); if (!data) { printf("Couldn't parse arguments "); return CMD_RET_USAGE; } if (type_string_pack(argv[1], argv + 3, data)) { printf("Couldn't parse arguments "); free(data); return CMD_RET_USAGE; } err = tpm_nv_write_value(index, data, count); free(data); |
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return report_return_code(err); |
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} |
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#ifdef CONFIG_TPM_AUTH_SESSIONS static int do_tpm_oiap(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t auth_handle, err; err = tpm_oiap(&auth_handle); |
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return report_return_code(err); |
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} static int do_tpm_load_key2_oiap(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t parent_handle, key_len, key_handle, err; uint8_t usage_auth[DIGEST_LENGTH]; void *key; if (argc < 5) return CMD_RET_USAGE; parent_handle = simple_strtoul(argv[1], NULL, 0); key = (void *)simple_strtoul(argv[2], NULL, 0); key_len = simple_strtoul(argv[3], NULL, 0); if (strlen(argv[4]) != 2 * DIGEST_LENGTH) return CMD_RET_FAILURE; parse_byte_string(argv[4], usage_auth, NULL); err = tpm_load_key2_oiap(parent_handle, key, key_len, usage_auth, &key_handle); if (!err) printf("Key handle is 0x%x ", key_handle); |
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return report_return_code(err); |
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} static int do_tpm_get_pub_key_oiap(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { uint32_t key_handle, err; uint8_t usage_auth[DIGEST_LENGTH]; uint8_t pub_key_buffer[TPM_PUBKEY_MAX_LENGTH]; size_t pub_key_len = sizeof(pub_key_buffer); if (argc < 3) return CMD_RET_USAGE; key_handle = simple_strtoul(argv[1], NULL, 0); if (strlen(argv[2]) != 2 * DIGEST_LENGTH) return CMD_RET_FAILURE; parse_byte_string(argv[2], usage_auth, NULL); err = tpm_get_pub_key_oiap(key_handle, usage_auth, pub_key_buffer, &pub_key_len); if (!err) { printf("dump of received pub key structure: "); print_byte_string(pub_key_buffer, pub_key_len); } |
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return report_return_code(err); |
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} TPM_COMMAND_NO_ARG(tpm_end_oiap) #endif /* CONFIG_TPM_AUTH_SESSIONS */ |
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#define MAKE_TPM_CMD_ENTRY(cmd) \ U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "") static cmd_tbl_t tpm_commands[] = { |
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U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""), |
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U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""), U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm_startup, "", ""), U_BOOT_CMD_MKENT(self_test_full, 0, 1, do_tpm_self_test_full, "", ""), U_BOOT_CMD_MKENT(continue_self_test, 0, 1, do_tpm_continue_self_test, "", ""), U_BOOT_CMD_MKENT(force_clear, 0, 1, do_tpm_force_clear, "", ""), U_BOOT_CMD_MKENT(physical_enable, 0, 1, do_tpm_physical_enable, "", ""), U_BOOT_CMD_MKENT(physical_disable, 0, 1, do_tpm_physical_disable, "", ""), U_BOOT_CMD_MKENT(nv_define_space, 0, 1, do_tpm_nv_define_space, "", ""), U_BOOT_CMD_MKENT(nv_read_value, 0, 1, do_tpm_nv_read_value, "", ""), U_BOOT_CMD_MKENT(nv_write_value, 0, 1, do_tpm_nv_write_value, "", ""), U_BOOT_CMD_MKENT(extend, 0, 1, do_tpm_extend, "", ""), U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""), U_BOOT_CMD_MKENT(tsc_physical_presence, 0, 1, do_tpm_tsc_physical_presence, "", ""), U_BOOT_CMD_MKENT(read_pubek, 0, 1, do_tpm_read_pubek, "", ""), U_BOOT_CMD_MKENT(physical_set_deactivated, 0, 1, do_tpm_physical_set_deactivated, "", ""), U_BOOT_CMD_MKENT(get_capability, 0, 1, do_tpm_get_capability, "", ""), U_BOOT_CMD_MKENT(raw_transfer, 0, 1, do_tpm_raw_transfer, "", ""), U_BOOT_CMD_MKENT(nv_define, 0, 1, do_tpm_nv_define, "", ""), U_BOOT_CMD_MKENT(nv_read, 0, 1, do_tpm_nv_read, "", ""), U_BOOT_CMD_MKENT(nv_write, 0, 1, do_tpm_nv_write, "", ""), |
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#ifdef CONFIG_TPM_AUTH_SESSIONS U_BOOT_CMD_MKENT(oiap, 0, 1, do_tpm_oiap, "", ""), U_BOOT_CMD_MKENT(end_oiap, 0, 1, do_tpm_end_oiap, "", ""), U_BOOT_CMD_MKENT(load_key2_oiap, 0, 1, do_tpm_load_key2_oiap, "", ""), U_BOOT_CMD_MKENT(get_pub_key_oiap, 0, 1, do_tpm_get_pub_key_oiap, "", ""), #endif /* CONFIG_TPM_AUTH_SESSIONS */ |
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}; static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { cmd_tbl_t *tpm_cmd; if (argc < 2) return CMD_RET_USAGE; tpm_cmd = find_cmd_tbl(argv[1], tpm_commands, ARRAY_SIZE(tpm_commands)); if (!tpm_cmd) return CMD_RET_USAGE; |
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return tpm_cmd->cmd(cmdtp, flag, argc - 1, argv + 1); |
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713 |
} |
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U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPM command", "cmd args... " " - Issue TPM command <cmd> with arguments <args...>. " "Admin Startup and State Commands: " |
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" info - Show information about the TPM " |
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" init " " - Put TPM into a state where it waits for 'startup' command. " " startup mode " " - Issue TPM_Starup command. <mode> is one of TPM_ST_CLEAR, " " TPM_ST_STATE, and TPM_ST_DEACTIVATED. " "Admin Testing Commands: " " self_test_full " " - Test all of the TPM capabilities. " " continue_self_test " " - Inform TPM that it should complete the self-test. " "Admin Opt-in Commands: " " physical_enable " " - Set the PERMANENT disable flag to FALSE using physical presence as " " authorization. " " physical_disable " " - Set the PERMANENT disable flag to TRUE using physical presence as " " authorization. " " physical_set_deactivated 0|1 " " - Set deactivated flag. " "Admin Ownership Commands: " " force_clear " " - Issue TPM_ForceClear command. " " tsc_physical_presence flags " " - Set TPM device's Physical Presence flags to <flags>. " "The Capability Commands: " " get_capability cap_area sub_cap addr count " " - Read <count> bytes of TPM capability indexed by <cap_area> and " " <sub_cap> to memory address <addr>. " |
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#ifdef CONFIG_TPM_AUTH_SESSIONS "Storage functions " " loadkey2_oiap parent_handle key_addr key_len usage_auth " " - loads a key data from memory address <key_addr>, <key_len> bytes " " into TPM using the parent key <parent_handle> with authorization " " <usage_auth> (20 bytes hex string). " " get_pub_key_oiap key_handle usage_auth " " - get the public key portion of a loaded key <key_handle> using " " authorization <usage auth> (20 bytes hex string) " #endif /* CONFIG_TPM_AUTH_SESSIONS */ |
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"Endorsement Key Handling Commands: " " read_pubek addr count " " - Read <count> bytes of the public endorsement key to memory " " address <addr> " "Integrity Collection and Reporting Commands: " " extend index digest_hex_string " " - Add a new measurement to a PCR. Update PCR <index> with the 20-bytes " " <digest_hex_string> " " pcr_read index addr count " " - Read <count> bytes from PCR <index> to memory address <addr>. " |
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#ifdef CONFIG_TPM_AUTH_SESSIONS "Authorization Sessions " " oiap " " - setup an OIAP session " " end_oiap " " - terminates an active OIAP session " #endif /* CONFIG_TPM_AUTH_SESSIONS */ |
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"Non-volatile Storage Commands: " " nv_define_space index permission size " " - Establish a space at index <index> with <permission> of <size> bytes. " " nv_read_value index addr count " " - Read <count> bytes from space <index> to memory address <addr>. " " nv_write_value index addr count " " - Write <count> bytes from memory address <addr> to space <index>. " "Miscellaneous helper functions: " " raw_transfer byte_string " " - Send a byte string <byte_string> to TPM and print the response. " " Non-volatile storage helper functions: " " These helper functions treat a non-volatile space as a non-padded " " sequence of integer values. These integer values are defined by a type " " string, which is a text string of 'bwd' characters: 'b' means a 8-bit " " value, 'w' 16-bit value, 'd' 32-bit value. All helper functions take " " a type string as their first argument. " " nv_define type_string index perm " " - Define a space <index> with permission <perm>. " " nv_read types_string index vars... " " - Read from space <index> to environment variables <vars...>. " " nv_write types_string index values... " " - Write to space <index> from values <values...>. " |
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); |