diff options
Diffstat (limited to 'src/security/tpm')
| -rw-r--r-- | src/security/tpm/Kconfig | 17 | ||||
| -rw-r--r-- | src/security/tpm/Makefile.inc | 45 | ||||
| -rw-r--r-- | src/security/tpm/tspi.h | 7 | ||||
| -rw-r--r-- | src/security/tpm/tspi/crtm.c | 197 | ||||
| -rw-r--r-- | src/security/tpm/tspi/crtm.h | 65 | ||||
| -rw-r--r-- | src/security/tpm/tspi/log.c | 12 | ||||
| -rw-r--r-- | src/security/tpm/tspi/tspi.c | 52 |
7 files changed, 356 insertions, 39 deletions
diff --git a/src/security/tpm/Kconfig b/src/security/tpm/Kconfig index 1766939c4c..d8652b2017 100644 --- a/src/security/tpm/Kconfig +++ b/src/security/tpm/Kconfig @@ -100,4 +100,21 @@ config TPM_STARTUP_IGNORE_POSTINIT or VBOOT on the Intel Arrandale processor, which issues a CPU-only reset during the romstage. +config TPM_MEASURED_BOOT + bool "Enable Measured Boot" + default n + select VBOOT_LIB + depends on TPM1 || TPM2 + depends on !VBOOT_RETURN_FROM_VERSTAGE + help + Enables measured boot (experimental) + +config TPM_MEASURED_BOOT_RUNTIME_DATA + string "Runtime data whitelist" + default "" + depends on TPM_MEASURED_BOOT + help + Runtime data whitelist of cbfs filenames. Needs to be a + comma separated list + endmenu # Trusted Platform Module (tpm) diff --git a/src/security/tpm/Makefile.inc b/src/security/tpm/Makefile.inc index a2d32cff89..c36183dd9b 100644 --- a/src/security/tpm/Makefile.inc +++ b/src/security/tpm/Makefile.inc @@ -6,22 +6,17 @@ ifeq ($(CONFIG_TPM1),y) ramstage-y += tss/tcg-1.2/tss.c romstage-y += tss/tcg-1.2/tss.c - -verstage-$(CONFIG_VBOOT) += tss/tcg-1.2/tss.c -postcar-$(CONFIG_VBOOT) += tss/tcg-1.2/tss.c +bootblock-y += tss/tcg-1.2/tss.c +verstage-y += tss/tcg-1.2/tss.c +postcar-y += tss/tcg-1.2/tss.c ## TSPI ramstage-y += tspi/tspi.c romstage-y += tspi/tspi.c - -verstage-$(CONFIG_VBOOT) += tspi/tspi.c -postcar-$(CONFIG_VBOOT) += tspi/tspi.c - -ramstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -romstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -verstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -postcar-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c +bootblock-y += tspi/tspi.c +verstage-y += tspi/tspi.c +postcar-y += tspi/tspi.c endif # CONFIG_TPM1 @@ -39,17 +34,31 @@ verstage-$(CONFIG_VBOOT) += tss/tcg-2.0/tss.c postcar-y += tss/tcg-2.0/tss_marshaling.c postcar-y += tss/tcg-2.0/tss.c +bootblock-y += tss/tcg-2.0/tss_marshaling.c +bootblock-y += tss/tcg-2.0/tss.c + ## TSPI ramstage-y += tspi/tspi.c romstage-y += tspi/tspi.c - +bootblock-y += tspi/tspi.c verstage-$(CONFIG_VBOOT) += tspi/tspi.c -postcar-$(CONFIG_VBOOT) += tspi/tspi.c - -ramstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -romstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -verstage-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c -postcar-$(CONFIG_VBOOT_MEASURED_BOOT) += tspi/log.c +postcar-y += tspi/tspi.c endif # CONFIG_TPM2 + +ifeq ($(CONFIG_TPM_MEASURED_BOOT),y) + +bootblock-y += tspi/crtm.c +verstage-y += tspi/crtm.c +romstage-y += tspi/crtm.c +ramstage-y += tspi/crtm.c +postcar-y += tspi/crtm.c + +ramstage-y += tspi/log.c +romstage-y += tspi/log.c +verstage-y += tspi/log.c +postcar-y += tspi/log.c +bootblock-y += tspi/log.c + +endif # CONFIG_TPM_MEASURED_BOOT diff --git a/src/security/tpm/tspi.h b/src/security/tpm/tspi.h index 6854401d03..7ea90e280e 100644 --- a/src/security/tpm/tspi.h +++ b/src/security/tpm/tspi.h @@ -24,6 +24,12 @@ #define HASH_DATA_CHUNK_SIZE 1024 /** + * Get the pointer to the single instance of global + * tcpa log data, and initialize it when necessary + */ +struct tcpa_table *tcpa_log_init(void); + +/** * Clears the pre-RAM tcpa log data and initializes * any content with default values */ @@ -47,6 +53,7 @@ void tcpa_log_add_table_entry(const char *name, const uint32_t pcr, */ void tcpa_log_dump(void *unused); + /** * Ask vboot for a digest and extend a TPM PCR with it. * @param pcr sets the pcr index diff --git a/src/security/tpm/tspi/crtm.c b/src/security/tpm/tspi/crtm.c new file mode 100644 index 0000000000..dc7d7d21f0 --- /dev/null +++ b/src/security/tpm/tspi/crtm.c @@ -0,0 +1,197 @@ +/* + * This file is part of the coreboot project. + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <console/console.h> +#include <fmap.h> +#include <cbfs.h> +#include "crtm.h" +#include <string.h> + +/* + * This function sets the TCPA log namespace + * for the cbfs file (region) lookup. + */ +static int create_tcpa_metadata(const struct region_device *rdev, + const char *cbfs_name, char log_string[TCPA_PCR_HASH_NAME]) +{ + int i; + struct region_device fmap; + static const char *const fmap_cbfs_names[] = { + "COREBOOT", + "FW_MAIN_A", + "FW_MAIN_B", + "RW_LEGACY" + }; + + for (i = 0; i < ARRAY_SIZE(fmap_cbfs_names); i++) { + if (fmap_locate_area_as_rdev(fmap_cbfs_names[i], &fmap) == 0) { + if (region_is_subregion(region_device_region(&fmap), + region_device_region(rdev))) { + snprintf(log_string, TCPA_PCR_HASH_NAME, + "FMAP: %s CBFS: %s", + fmap_cbfs_names[i], cbfs_name); + return 0; + } + } + } + + return -1; +} + +static int tcpa_log_initialized; +static inline int tcpa_log_available(void) +{ + if (ENV_BOOTBLOCK) + return tcpa_log_initialized; + + return 1; +} + +uint32_t tspi_init_crtm(void) +{ + struct prog bootblock = PROG_INIT(PROG_BOOTBLOCK, "bootblock"); + + /* Initialize TCPA PRERAM log. */ + if (!tcpa_log_available()) { + tcpa_preram_log_clear(); + tcpa_log_initialized = 1; + } else { + printk(BIOS_WARNING, "TSPI: CRTM already initialized!\n"); + return VB2_SUCCESS; + } + + /* measure bootblock from RO */ + struct cbfsf bootblock_data; + struct region_device bootblock_fmap; + if (fmap_locate_area_as_rdev("BOOTBLOCK", &bootblock_fmap) == 0) { + if (tpm_measure_region(&bootblock_fmap, + TPM_CRTM_PCR, + "FMAP: BOOTBLOCK")) + return VB2_ERROR_UNKNOWN; + } else { + if (cbfs_boot_locate(&bootblock_data, + prog_name(&bootblock), NULL)) { + /* + * measurement is done in + * tspi_measure_cbfs_hook() + */ + printk(BIOS_INFO, + "TSPI: Couldn't measure bootblock into CRTM!\n"); + return VB2_ERROR_UNKNOWN; + } + } + + return VB2_SUCCESS; +} + +static bool is_runtime_data(const char *name) +{ + const char *whitelist = CONFIG_TPM_MEASURED_BOOT_RUNTIME_DATA; + size_t whitelist_len = sizeof(CONFIG_TPM_MEASURED_BOOT_RUNTIME_DATA) - 1; + size_t name_len = strlen(name); + int i; + + if (!whitelist_len || !name_len) + return false; + + for (i = 0; (i + name_len) <= whitelist_len; i++) { + if (!strcmp(whitelist + i, name)) + return true; + } + + return false; +} + +uint32_t tspi_measure_cbfs_hook(struct cbfsf *fh, const char *name) +{ + uint32_t pcr_index; + uint32_t cbfs_type; + struct region_device rdev; + char tcpa_metadata[TCPA_PCR_HASH_NAME]; + + if (!tcpa_log_available()) { + if (tspi_init_crtm() != VB2_SUCCESS) { + printk(BIOS_WARNING, + "Initializing CRTM failed!"); + return 0; + } + printk(BIOS_DEBUG, "CRTM initialized."); + } + + cbfsf_file_type(fh, &cbfs_type); + cbfs_file_data(&rdev, fh); + + switch (cbfs_type) { + case CBFS_TYPE_MRC: + case CBFS_TYPE_MRC_CACHE: + pcr_index = TPM_RUNTIME_DATA_PCR; + break; + case CBFS_TYPE_STAGE: + case CBFS_TYPE_SELF: + case CBFS_TYPE_FIT: + pcr_index = TPM_CRTM_PCR; + break; + default: + if (is_runtime_data(name)) + pcr_index = TPM_RUNTIME_DATA_PCR; + else + pcr_index = TPM_CRTM_PCR; + break; + } + + if (create_tcpa_metadata(&rdev, name, tcpa_metadata) < 0) + return VB2_ERROR_UNKNOWN; + + return tpm_measure_region(&rdev, pcr_index, tcpa_metadata); +} + +int tspi_measure_cache_to_pcr(void) +{ + int i; + enum vb2_hash_algorithm hash_alg; + struct tcpa_table *tclt = tcpa_log_init(); + + if (!tclt) { + printk(BIOS_WARNING, "TCPA: Log non-existent!\n"); + return VB2_ERROR_UNKNOWN; + } + if (CONFIG(TPM1)) { + hash_alg = VB2_HASH_SHA1; + } else { /* CONFIG_TPM2 */ + hash_alg = VB2_HASH_SHA256; + } + + + printk(BIOS_DEBUG, "TPM: Write digests cached in TCPA log to PCR\n"); + for (i = 0; i < tclt->num_entries; i++) { + struct tcpa_entry *tce = &tclt->entries[i]; + if (tce) { + printk(BIOS_DEBUG, "TPM: Write digest for" + " %s into PCR %d\n", + tce->name, tce->pcr); + int result = tlcl_extend(tce->pcr, + tce->digest, + NULL); + if (result != TPM_SUCCESS) { + printk(BIOS_ERR, "TPM: Writing digest" + " of %s into PCR failed with error" + " %d\n", + tce->name, result); + return VB2_ERROR_UNKNOWN; + } + } + } + + return VB2_SUCCESS; +} diff --git a/src/security/tpm/tspi/crtm.h b/src/security/tpm/tspi/crtm.h new file mode 100644 index 0000000000..dfd91e1c0e --- /dev/null +++ b/src/security/tpm/tspi/crtm.h @@ -0,0 +1,65 @@ +/* + * This file is part of the coreboot project. + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __SECURITY_TSPI_CRTM_H__ +#define __SECURITY_TSPI_CRTM_H__ + +#include <commonlib/cbfs.h> +#include <program_loading.h> +#include <security/tpm/tspi.h> +#include <types.h> + +/* CRTM */ +#define TPM_CRTM_PCR 2 + +/* PCR for measuring data which changes during runtime + * e.g. CMOS, NVRAM... + */ +#define TPM_RUNTIME_DATA_PCR 3 + +/* + * Initializes the Core Root of Trust for Measurements + * in coreboot. The initial code in a chain of trust must measure + * itself. + * + * Summary: + * + Measures bootblock in CBFS or BOOTBLOCK FMAP partition. + * + If vboot starts in romstage, it measures the romstage + * in CBFS. + * + Measure the verstage if it is compiled as separate + * stage. + * + * Takes the current vboot context as parameter for s3 checks. + * returns on success VB2_SUCCESS, else a vboot error. + */ +uint32_t tspi_init_crtm(void); + +/** + * Measure digests cached in TCPA log entries into PCRs + */ +int tspi_measure_cache_to_pcr(void); + +#if CONFIG(TPM_MEASURED_BOOT) +/* + * Measures cbfs data via hook (cbfs) + * fh is the cbfs file handle to measure + * return 0 if successful, else an error + */ +uint32_t tspi_measure_cbfs_hook(struct cbfsf *fh, const char *name); + +#else +#define tspi_measure_cbfs_hook(fh, name) 0 +#endif + +#endif /* __SECURITY_TSPI_CRTM_H__ */ diff --git a/src/security/tpm/tspi/log.c b/src/security/tpm/tspi/log.c index 068d78da19..e43f74d069 100644 --- a/src/security/tpm/tspi/log.c +++ b/src/security/tpm/tspi/log.c @@ -16,7 +16,7 @@ #include <security/tpm/tspi.h> #include <region_file.h> #include <string.h> -#include <security/vboot/symbols.h> +#include <symbols.h> #include <cbmem.h> #include <bootstate.h> #include <vb2_sha.h> @@ -42,7 +42,7 @@ static struct tcpa_table *tcpa_cbmem_init(void) return tclt; } -static struct tcpa_table *tcpa_log_init(void) +struct tcpa_table *tcpa_log_init(void) { MAYBE_STATIC_BSS struct tcpa_table *tclt = NULL; @@ -50,12 +50,12 @@ static struct tcpa_table *tcpa_log_init(void) * If cbmem isn't available use CAR or SRAM */ if (!cbmem_possibly_online() && !CONFIG(VBOOT_RETURN_FROM_VERSTAGE)) - return (struct tcpa_table *)_vboot2_tpm_log; + return (struct tcpa_table *)_tpm_tcpa_log; else if (ENV_ROMSTAGE && !CONFIG(VBOOT_RETURN_FROM_VERSTAGE)) { tclt = tcpa_cbmem_init(); if (!tclt) - return (struct tcpa_table *)_vboot2_tpm_log; + return (struct tcpa_table *)_tpm_tcpa_log; } else { tclt = tcpa_cbmem_init(); } @@ -128,7 +128,7 @@ void tcpa_log_add_table_entry(const char *name, const uint32_t pcr, void tcpa_preram_log_clear(void) { printk(BIOS_INFO, "TCPA: Clearing coreboot TCPA log\n"); - struct tcpa_table *tclt = (struct tcpa_table *)_vboot2_tpm_log; + struct tcpa_table *tclt = (struct tcpa_table *)_tpm_tcpa_log; tclt->max_entries = MAX_TCPA_LOG_ENTRIES; tclt->num_entries = 0; } @@ -136,7 +136,7 @@ void tcpa_preram_log_clear(void) #if !CONFIG(VBOOT_RETURN_FROM_VERSTAGE) static void recover_tcpa_log(int is_recovery) { - struct tcpa_table *preram_log = (struct tcpa_table *)_vboot2_tpm_log; + struct tcpa_table *preram_log = (struct tcpa_table *)_tpm_tcpa_log; struct tcpa_table *ram_log = NULL; int i; diff --git a/src/security/tpm/tspi/tspi.c b/src/security/tpm/tspi/tspi.c index 0095183ca2..4f0cc972a7 100644 --- a/src/security/tpm/tspi/tspi.c +++ b/src/security/tpm/tspi/tspi.c @@ -14,13 +14,14 @@ #include <console/cbmem_console.h> #include <console/console.h> +#include <security/tpm/tspi/crtm.h> #include <security/tpm/tspi.h> #include <security/tpm/tss.h> -#if CONFIG(VBOOT) +#include <assert.h> +#include <security/vboot/misc.h> +#include <string.h> #include <vb2_api.h> #include <vb2_sha.h> -#include <assert.h> -#endif #if CONFIG(TPM1) static uint32_t tpm1_invoke_state_machine(void) @@ -100,6 +101,18 @@ static uint32_t tpm_setup_epilogue(uint32_t result) return result; } +static int tpm_is_setup; +static inline int tspi_tpm_is_setup(void) +{ + if (CONFIG(VBOOT)) + return vboot_logic_executed() || tpm_is_setup; + + if (ENV_RAMSTAGE) + return tpm_is_setup; + + return 0; +} + /* * tpm_setup starts the TPM and establishes the root of trust for the * anti-rollback mechanism. tpm_setup can fail for three reasons. 1 A bug. @@ -170,7 +183,10 @@ uint32_t tpm_setup(int s3flag) #if CONFIG(TPM1) result = tpm1_invoke_state_machine(); #endif + if (CONFIG(TPM_MEASURED_BOOT)) + result = tspi_measure_cache_to_pcr(); + tpm_is_setup = 1; return tpm_setup_epilogue(result); } @@ -210,18 +226,27 @@ uint32_t tpm_extend_pcr(int pcr, enum vb2_hash_algorithm digest_algo, if (!digest) return TPM_E_IOERROR; - result = tlcl_extend(pcr, digest, NULL); - if (result != TPM_SUCCESS) - return result; + if (tspi_tpm_is_setup()) { + result = tlcl_lib_init(); + if (result != TPM_SUCCESS) { + printk(BIOS_ERR, "TPM: Can't initialize library.\n"); + return result; + } + + printk(BIOS_DEBUG, "TPM: Extending digest for %s into PCR %d\n", name, pcr); + result = tlcl_extend(pcr, digest, NULL); + if (result != TPM_SUCCESS) + return result; + } - if (CONFIG(VBOOT_MEASURED_BOOT)) + if (CONFIG(TPM_MEASURED_BOOT)) tcpa_log_add_table_entry(name, pcr, digest_algo, digest, digest_len); return TPM_SUCCESS; } -#if CONFIG(VBOOT) +#if CONFIG(VBOOT_LIB) uint32_t tpm_measure_region(const struct region_device *rdev, uint8_t pcr, const char *rname) { @@ -234,11 +259,7 @@ uint32_t tpm_measure_region(const struct region_device *rdev, uint8_t pcr, if (!rdev || !rname) return TPM_E_INVALID_ARG; - result = tlcl_lib_init(); - if (result != TPM_SUCCESS) { - printk(BIOS_ERR, "TPM: Can't initialize library.\n"); - return result; - } + if (CONFIG(TPM1)) { hash_alg = VB2_HASH_SHA1; } else { /* CONFIG_TPM2 */ @@ -277,7 +298,8 @@ uint32_t tpm_measure_region(const struct region_device *rdev, uint8_t pcr, printk(BIOS_ERR, "TPM: Extending hash into PCR failed.\n"); return result; } - printk(BIOS_DEBUG, "TPM: Measured %s into PCR %d\n", rname, pcr); + printk(BIOS_DEBUG, "TPM: Digest of %s to PCR %d %s\n", + rname, pcr, tspi_tpm_is_setup() ? "measured" : "logged"); return TPM_SUCCESS; } -#endif /* VBOOT */ +#endif /* VBOOT_LIB */ |