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Tue, 25 May 2021 06:47:53 -0700 (PDT) MIME-Version: 1.0 References: <20210514005337.5243-1-masahisa.kojima@linaro.org> <20210514005337.5243-4-masahisa.kojima@linaro.org> <7eecf28f-0e5b-70ff-0f8d-4992458bf0d9@gmx.de> In-Reply-To: <7eecf28f-0e5b-70ff-0f8d-4992458bf0d9@gmx.de> From: Masahisa Kojima Date: Tue, 25 May 2021 22:47:40 +0900 Message-ID: Subject: Re: [PATCH v8 3/3] efi_loader: add PE/COFF image measurement To: Heinrich Schuchardt Cc: Alexander Graf , Simon Glass , Ilias Apalodimas , Dhananjay Phadke , Takahiro Akashi , Alexandru Gagniuc , u-boot@lists.denx.de Content-Type: text/plain; charset="UTF-8" X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.34 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.102.4 at phobos.denx.de X-Virus-Status: Clean On Tue, 25 May 2021 at 21:57, Heinrich Schuchardt wrote: > > On 14.05.21 02:53, Masahisa Kojima wrote: > > "TCG PC Client Platform Firmware Profile Specification" > > requires to measure every attempt to load and execute > > a OS Loader(a UEFI application) into PCR[4]. > > This commit adds the PE/COFF image measurement, extends PCR, > > and appends measurement into Event Log. > > > > Acked-by: Ilias Apalodimas > > Tested-by: Ilias Apalodimas > > Signed-off-by: Masahisa Kojima > > --- > > > > (no changes since v7) > > > > Changes in v7: > > - include hash-checksum.h instead of rsa.h > > - select HASH_CALCULATE in Kconfig, not to update lib/Makefile > > - rebased the base code > > > > Changes in v6: > > - update lib/Makefile to add hash-checksum.c as a compilation target > > > > (no changes since v2) > > > > Changes in v2: > > - Remove duplicate include > > - Remove unnecessary __packed attribute > > - Add all EV_EFI_* event definition > > - Create common function to prepare 8-byte aligned image > > - Add measurement for EV_EFI_BOOT_SERVICES_DRIVER and > > EV_EFI_RUNTIME_SERVICES_DRIVER > > - Use efi_search_protocol() to get device_path > > - Add function comment > > > > include/efi_loader.h | 6 + > > include/efi_tcg2.h | 9 ++ > > include/tpm-v2.h | 18 +++ > > lib/efi_loader/Kconfig | 1 + > > lib/efi_loader/efi_image_loader.c | 59 +++++++-- > > lib/efi_loader/efi_tcg2.c | 207 ++++++++++++++++++++++++++++-- > > 6 files changed, 276 insertions(+), 24 deletions(-) > > > > diff --git a/include/efi_loader.h b/include/efi_loader.h > > index de1a496a97..9f2854a255 100644 > > --- a/include/efi_loader.h > > +++ b/include/efi_loader.h > > @@ -426,6 +426,10 @@ efi_status_t efi_disk_register(void); > > efi_status_t efi_rng_register(void); > > /* Called by efi_init_obj_list() to install EFI_TCG2_PROTOCOL */ > > efi_status_t efi_tcg2_register(void); > > +/* measure the pe-coff image, extend PCR and add Event Log */ > > +efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size, > > + struct efi_loaded_image_obj *handle, > > + struct efi_loaded_image *loaded_image_info); > > /* Create handles and protocols for the partitions of a block device */ > > int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc, > > const char *if_typename, int diskid, > > @@ -847,6 +851,8 @@ bool efi_secure_boot_enabled(void); > > > > bool efi_capsule_auth_enabled(void); > > > > +void *efi_prepare_aligned_image(void *efi, u64 *efi_size, void **new_efi); > > + > > bool efi_image_parse(void *efi, size_t len, struct efi_image_regions **regp, > > WIN_CERTIFICATE **auth, size_t *auth_len); > > > > diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h > > index 40e241ce31..bcfb98168a 100644 > > --- a/include/efi_tcg2.h > > +++ b/include/efi_tcg2.h > > @@ -9,6 +9,7 @@ > > #if !defined _EFI_TCG2_PROTOCOL_H_ > > #define _EFI_TCG2_PROTOCOL_H_ > > > > +#include > > #include > > > > #define EFI_TCG2_PROTOCOL_GUID \ > > @@ -53,6 +54,14 @@ struct efi_tcg2_event { > > u8 event[]; > > } __packed; > > > > +struct uefi_image_load_event { > > + efi_physical_addr_t image_location_in_memory; > > + u64 image_length_in_memory; > > + u64 image_link_time_address; > > + u64 length_of_device_path; > > + struct efi_device_path device_path[]; > > +}; > > + > > struct efi_tcg2_boot_service_capability { > > u8 size; > > struct efi_tcg2_version structure_version; > > diff --git a/include/tpm-v2.h b/include/tpm-v2.h > > index 7de7d6a57d..247b386967 100644 > > --- a/include/tpm-v2.h > > +++ b/include/tpm-v2.h > > @@ -70,6 +70,24 @@ struct udevice; > > #define EV_TABLE_OF_DEVICES ((u32)0x0000000B) > > #define EV_COMPACT_HASH ((u32)0x0000000C) > > > > +/* > > + * event types, cf. > > + * "TCG PC Client Platform Firmware Profile Specification", Family "2.0" > > + * rev 1.04, June 3, 2019 > > + */ > > +#define EV_EFI_EVENT_BASE ((u32)0x80000000) > > +#define EV_EFI_VARIABLE_DRIVER_CONFIG ((u32)0x80000001) > > +#define EV_EFI_VARIABLE_BOOT ((u32)0x80000002) > > +#define EV_EFI_BOOT_SERVICES_APPLICATION ((u32)0x80000003) > > +#define EV_EFI_BOOT_SERVICES_DRIVER ((u32)0x80000004) > > +#define EV_EFI_RUNTIME_SERVICES_DRIVER ((u32)0x80000005) > > +#define EV_EFI_GPT_EVENT ((u32)0x80000006) > > +#define EV_EFI_ACTION ((u32)0x80000007) > > +#define EV_EFI_PLATFORM_FIRMWARE_BLOB ((u32)0x80000008) > > +#define EV_EFI_HANDOFF_TABLES ((u32)0x80000009) > > +#define EV_EFI_HCRTM_EVENT ((u32)0x80000010) > > +#define EV_EFI_VARIABLE_AUTHORITY ((u32)0x800000E0) > > + > > /* TPMS_TAGGED_PROPERTY Structure */ > > struct tpms_tagged_property { > > u32 property; > > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig > > index 98845b8ba3..0e6200fa25 100644 > > --- a/lib/efi_loader/Kconfig > > +++ b/lib/efi_loader/Kconfig > > @@ -309,6 +309,7 @@ config EFI_TCG2_PROTOCOL > > select SHA512_ALGO > > select SHA384 > > select SHA512 > > + select HASH_CALCULATE > > help > > Provide a EFI_TCG2_PROTOCOL implementation using the TPM hardware > > of the platform. > > diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c > > index fe1ee198e2..f37a85e56e 100644 > > --- a/lib/efi_loader/efi_image_loader.c > > +++ b/lib/efi_loader/efi_image_loader.c > > @@ -302,6 +302,40 @@ static int cmp_pe_section(const void *arg1, const void *arg2) > > return 1; > > } > > > > +/** > > + * efi_prepare_aligned_image() - prepare 8-byte aligned image > > + * @efi: pointer to the EFI binary > > + * @efi_size: size of @efi binary > > + * @new_efi: pointer to the newly allocated image > > + * > > + * If @efi is not 8-byte aligned, this function newly allocates > > + * the image buffer and updates @efi_size. > > + * > > + * Return: valid pointer to a image, return NULL if allocation fails. > > + */ > > +void *efi_prepare_aligned_image(void *efi, u64 *efi_size, void **new_efi) > > +{ > > + size_t new_efi_size; > > + void *p; > > + > > + /* > > + * Size must be 8-byte aligned and the trailing bytes must be > > + * zero'ed. Otherwise hash value may be incorrect. > > + */ > > + if (!IS_ALIGNED(*efi_size, 8)) { > > Why don't you unconditionally copy to a new buffer? Then the caller can > free the return value unconditionally. > > > + new_efi_size = ALIGN(*efi_size, 8); > > + p = calloc(new_efi_size, 1); > > + if (!p) > > + return NULL; > > + memcpy(p, efi, *efi_size); > > + *efi_size = new_efi_size; > > + *new_efi = p; > > + return p; > > + } else { > > + return efi; > > + } > > +} > > + > > /** > > * efi_image_parse() - parse a PE image > > * @efi: Pointer to image > > @@ -561,7 +595,7 @@ static bool efi_image_authenticate(void *efi, size_t efi_size) > > struct efi_signature_store *db = NULL, *dbx = NULL; > > void *new_efi = NULL; > > u8 *auth, *wincerts_end; > > - size_t new_efi_size, auth_size; > > + size_t auth_size; > > bool ret = false; > > > > EFI_PRINT("%s: Enter, %d\n", __func__, ret); > > @@ -569,19 +603,9 @@ static bool efi_image_authenticate(void *efi, size_t efi_size) > > if (!efi_secure_boot_enabled()) > > return true; > > > > - /* > > - * Size must be 8-byte aligned and the trailing bytes must be > > - * zero'ed. Otherwise hash value may be incorrect. > > - */ > > - if (efi_size & 0x7) { > > - new_efi_size = (efi_size + 0x7) & ~0x7ULL; > > - new_efi = calloc(new_efi_size, 1); > > - if (!new_efi) > > - return false; > > - memcpy(new_efi, efi, efi_size); > > - efi = new_efi; > > - efi_size = new_efi_size; > > - } > > + efi = efi_prepare_aligned_image(efi, (u64 *)&efi_size, &new_efi); > > + if (!efi) > > + return false; > > > > if (!efi_image_parse(efi, efi_size, ®s, &wincerts, > > &wincerts_len)) { > > @@ -891,6 +915,13 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, > > goto err; > > } > > > > +#if CONFIG_IS_ENABLED(EFI_TCG2_PROTOCOL) > > + /* Measure an PE/COFF image */ > > + if (tcg2_measure_pe_image(efi, efi_size, handle, > > + loaded_image_info)) > > + log_err("PE image measurement failed\n"); > > +#endif > > + > > /* Copy PE headers */ > > memcpy(efi_reloc, efi, > > sizeof(*dos) > > diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c > > index c8616bf31e..316eaf572b 100644 > > --- a/lib/efi_loader/efi_tcg2.c > > +++ b/lib/efi_loader/efi_tcg2.c > > @@ -13,8 +13,10 @@ > > #include > > #include > > #include > > +#include > > #include > > #include > > +#include > > #include > > #include > > #include > > @@ -706,6 +708,183 @@ out: > > return EFI_EXIT(ret); > > } > > > > +/** > > + * tcg2_hash_pe_image() - calculate PE/COFF image hash > > + * > > + * @efi: pointer to the EFI binary > > + * @efi_size: size of @efi binary > > + * @digest_list: list of digest algorithms to extend > > + * > > + * Return: status code > > + */ > > +static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size, > > + struct tpml_digest_values *digest_list) > > +{ > > + WIN_CERTIFICATE *wincerts = NULL; > > + size_t wincerts_len; > > + struct efi_image_regions *regs = NULL; > > + void *new_efi = NULL; > > + u8 hash[TPM2_SHA512_DIGEST_SIZE]; > > + efi_status_t ret; > > + u32 active; > > + int i; > > + > > + efi = efi_prepare_aligned_image(efi, &efi_size, &new_efi); > > + if (!efi) > > + return EFI_OUT_OF_RESOURCES; > > + > > + if (!efi_image_parse(efi, efi_size, ®s, &wincerts, > > + &wincerts_len)) { > > + log_err("Parsing PE executable image failed\n"); > > + ret = EFI_INVALID_PARAMETER; > > + goto out; > > + } > > + > > + ret = __get_active_pcr_banks(&active); > > + if (ret != EFI_SUCCESS) { > > + ret = EFI_DEVICE_ERROR; > > + goto out; > > + } > > + > > + digest_list->count = 0; > > + for (i = 0; i < MAX_HASH_COUNT; i++) { > > + u16 hash_alg = hash_algo_list[i].hash_alg; > > + > > + if (!(active & alg_to_mask(hash_alg))) > > + continue; > > + switch (hash_alg) { > > + case TPM2_ALG_SHA1: > > + hash_calculate("sha1", regs->reg, regs->num, hash); > > + break; > > + case TPM2_ALG_SHA256: > > + hash_calculate("sha256", regs->reg, regs->num, hash); > > + break; > > + case TPM2_ALG_SHA384: > > + hash_calculate("sha384", regs->reg, regs->num, hash); > > + break; > > + case TPM2_ALG_SHA512: > > + hash_calculate("sha512", regs->reg, regs->num, hash); > > + break; > > + default: > > + EFI_PRINT("Unsupported algorithm %x\n", hash_alg); > > + return EFI_INVALID_PARAMETER; > > + } > > + digest_list->digests[i].hash_alg = hash_alg; > > + memcpy(&digest_list->digests[i].digest, hash, (u32)alg_to_len(hash_alg)); > > + digest_list->count++; > > + } > > + > > +out: > > + free(new_efi); > > new_efi may be a buffer allocated with calloc() in > efi_prepare_aligned_image() or it may be a buffer passed by an EFI > application to LoadImage(). You must not free() memory that was never > allocated via calloc() or malloc(). new_efi will possibly point two kinds of pointer, calloced buffer in efi_prepare_aligned_image() or NULL. Buffer passed by an EFI application to LoadImage() is preserved in variable "efi" and will not be freed in my code. Ilias also pointed that efi_prepare_aligned_image() returns and stores the same pointer looks a bit weird, current implementation is easy to get misunderstood. So I would like to remove **new_efi parameter from efi_prepare_aligned_image(), code will be something like: + new_efi = efi_prepare_aligned_image(efi, (u64 *)&efi_size); - if (!efi_image_parse(efi, efi_size, ®s, &wincerts, + if (!efi_image_parse(new_efi, efi_size, ®s, &wincerts, <--snip--> + if (new_efi != efi) free(new_efi); "new_efi" will point newly calloced buffer or Buffer passed by an EFI application to LoadImage(). "efi" always preserves the buffer passed by an EFI application to LoadImage(). Thanks, Masahisa Kojima > > Best regards > > Heinrich > > > + free(regs); > > + > > + return ret; > > +} > > + > > +/** > > + * tcg2_measure_pe_image() - measure PE/COFF image > > + * > > + * @efi: pointer to the EFI binary > > + * @efi_size: size of @efi binary > > + * @handle: loaded image handle > > + * @loaded_image: loaded image protocol > > + * > > + * Return: status code > > + */ > > +efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size, > > + struct efi_loaded_image_obj *handle, > > + struct efi_loaded_image *loaded_image) > > +{ > > + struct tpml_digest_values digest_list; > > + efi_status_t ret; > > + struct udevice *dev; > > + u32 pcr_index, event_type, event_size; > > + struct uefi_image_load_event *image_load_event; > > + struct efi_device_path *device_path; > > + u32 device_path_length; > > + IMAGE_DOS_HEADER *dos; > > + IMAGE_NT_HEADERS32 *nt; > > + struct efi_handler *handler; > > + > > + ret = platform_get_tpm2_device(&dev); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + switch (handle->image_type) { > > + case IMAGE_SUBSYSTEM_EFI_APPLICATION: > > + pcr_index = 4; > > + event_type = EV_EFI_BOOT_SERVICES_APPLICATION; > > + break; > > + case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER: > > + pcr_index = 2; > > + event_type = EV_EFI_BOOT_SERVICES_DRIVER; > > + break; > > + case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER: > > + pcr_index = 2; > > + event_type = EV_EFI_RUNTIME_SERVICES_DRIVER; > > + break; > > + default: > > + return EFI_UNSUPPORTED; > > + } > > + > > + ret = tcg2_hash_pe_image(efi, efi_size, &digest_list); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + ret = EFI_CALL(efi_search_protocol(&handle->header, > > + &efi_guid_loaded_image_device_path, > > + &handler)); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + device_path = EFI_CALL(handler->protocol_interface); > > + device_path_length = efi_dp_size(device_path); > > + if (device_path_length > 0) { > > + /* add end node size */ > > + device_path_length += sizeof(struct efi_device_path); > > + } > > + event_size = sizeof(struct uefi_image_load_event) + device_path_length; > > + image_load_event = (struct uefi_image_load_event *)malloc(event_size); > > + if (!image_load_event) > > + return EFI_OUT_OF_RESOURCES; > > + > > + image_load_event->image_location_in_memory = (efi_physical_addr_t)efi; > > + image_load_event->image_length_in_memory = efi_size; > > + image_load_event->length_of_device_path = device_path_length; > > + > > + dos = (IMAGE_DOS_HEADER *)efi; > > + nt = (IMAGE_NT_HEADERS32 *)(efi + dos->e_lfanew); > > + if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) { > > + IMAGE_NT_HEADERS64 *nt64 = (IMAGE_NT_HEADERS64 *)nt; > > + > > + image_load_event->image_link_time_address = > > + nt64->OptionalHeader.ImageBase; > > + } else if (nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC) { > > + image_load_event->image_link_time_address = > > + nt->OptionalHeader.ImageBase; > > + } else { > > + ret = EFI_INVALID_PARAMETER; > > + goto out; > > + } > > + > > + if (device_path_length > 0) { > > + memcpy(image_load_event->device_path, device_path, > > + device_path_length); > > + } > > + > > + ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list, > > + event_size, (u8 *)image_load_event); > > + > > +out: > > + free(image_load_event); > > + > > + return ret; > > +} > > + > > /** > > * efi_tcg2_hash_log_extend_event() - extend and optionally log events > > * > > @@ -758,24 +937,32 @@ efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags, > > /* > > * if PE_COFF_IMAGE is set we need to make sure the image is not > > * corrupted, verify it and hash the PE/COFF image in accordance with > > - * the procedure specified in "Calculating the PE Image Hash" > > - * section of the "Windows Authenticode Portable Executable Signature > > + * the procedure specified in "Calculating the PE Image Hash" > > + * section of the "Windows Authenticode Portable Executable Signature > > * Format" > > - * Not supported for now > > */ > > if (flags & PE_COFF_IMAGE) { > > - ret = EFI_UNSUPPORTED; > > - goto out; > > - } > > + IMAGE_NT_HEADERS32 *nt; > > > > - pcr_index = efi_tcg_event->header.pcr_index; > > - event_type = efi_tcg_event->header.event_type; > > + ret = efi_check_pe((void *)data_to_hash, data_to_hash_len, > > + (void **)&nt); > > + if (ret != EFI_SUCCESS) { > > + log_err("Not a valid PE-COFF file\n"); > > + goto out; > > + } > > + ret = tcg2_hash_pe_image((void *)data_to_hash, data_to_hash_len, > > + &digest_list); > > + } else { > > + ret = tcg2_create_digest((u8 *)(uintptr_t)data_to_hash, > > + data_to_hash_len, &digest_list); > > + } > > > > - ret = tcg2_create_digest((u8 *)(uintptr_t)data_to_hash, > > - data_to_hash_len, &digest_list); > > if (ret != EFI_SUCCESS) > > goto out; > > > > + pcr_index = efi_tcg_event->header.pcr_index; > > + event_type = efi_tcg_event->header.event_type; > > + > > ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); > > if (ret != EFI_SUCCESS) > > goto out; > > >