Fastbootd: flashing certification (5ccecfd2) · Commits · e / os / android_system_core

fastbootd/Android.mk

+3 −1

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ LOCAL_SRC_FILES := \
		commands/virtual_partitions.c \
		fastbootd.c \
		protocol.c \
		secure.c \
		transport.c \
		trigger.c \
		usb_linux_client.c \
		@@ -37,11 +38,12 @@ LOCAL_SRC_FILES := \

		LOCAL_MODULE := fastbootd
		LOCAL_MODULE_TAGS := optional
		LOCAL_CFLAGS := -Wall -Werror -Wno-unused-parameter
		LOCAL_CFLAGS := -Wall -Werror -Wno-unused-parameter -DFLASH_CERT
		LOCAL_LDFLAGS := -ldl

		LOCAL_SHARED_LIBRARIES := \
		libhardware \
		libcrypto \
		libhardware_legacy

		LOCAL_STATIC_LIBRARIES := \

fastbootd/commands.c

+32 −7

Original line number	Diff line number	Diff line
		@@ -52,6 +52,8 @@

		static void cmd_boot(struct protocol_handle phandle, const char arg)
		{
		int sz, atags_sz, new_atags_sz;
		int rv;
		unsigned kernel_actual;
		unsigned ramdisk_actual;
		unsigned second_actual;
		@@ -59,9 +61,11 @@ static void cmd_boot(struct protocol_handle phandle, const char arg)
		void *ramdisk_ptr;
		void *second_ptr;
		struct boot_img_hdr *hdr;
		int sz, atags_sz, new_atags_sz;
		int rv;
		char ptr = NULL, atags_ptr = NULL, *new_atags = NULL;
		char *ptr = NULL;
		char *atags_ptr = NULL;
		char *new_atags = NULL;
		int data_fd = 0;

		D(DEBUG, "cmd_boot %s\n", arg);

		if (phandle->download_fd < 0) {
		@@ -75,9 +79,18 @@ static void cmd_boot(struct protocol_handle phandle, const char arg)
		goto error;
		}

		sz = get_file_size(phandle->download_fd);
		// TODO: With cms we can also verify partition name included as
		// cms signed attribute
		if (flash_validate_certificate(phandle->download_fd, &data_fd) != 1) {
		fastboot_fail(phandle, "Access forbiden you need the certificate");
		return;
		}

		sz = get_file_size(data_fd);

		ptr = (char *) mmap(NULL, sz, PROT_READ,
		MAP_POPULATE \| MAP_PRIVATE, phandle->download_fd, 0);
		MAP_POPULATE \| MAP_PRIVATE, data_fd, 0);

		hdr = (struct boot_img_hdr *) ptr;

		if (ptr == MAP_FAILED) {
		@@ -130,6 +143,7 @@ static void cmd_boot(struct protocol_handle phandle, const char arg)
		free(atags_ptr);
		munmap(ptr, sz);
		free(new_atags);
		close(data_fd);

		D(INFO, "Kexec going to reboot");
		reboot(LINUX_REBOOT_CMD_KEXEC);
		@@ -256,6 +270,7 @@ static void cmd_flash(struct protocol_handle phandle, const char arg)
		char data[BOOT_MAGIC_SIZE];
		char path[PATH_MAX];
		ssize_t header_sz = 0;
		int data_fd = 0;

		D(DEBUG, "cmd_flash %s\n", arg);

		@@ -273,9 +288,14 @@ static void cmd_flash(struct protocol_handle phandle, const char arg)
		return;
		}

		if (flash_validate_certificate(phandle->download_fd, &data_fd) != 1) {
		fastboot_fail(phandle, "Access forbiden you need certificate");
		return;
		}

		// TODO: Maybe its goot idea to check whether the partition is just bootable partition
		if (!strcmp(arg, "boot") \|\| !strcmp(arg, "recovery")) {
		if (read_data_once(phandle->download_fd, data, BOOT_MAGIC_SIZE) < BOOT_MAGIC_SIZE) {
		if (read_data_once(data_fd, data, BOOT_MAGIC_SIZE) < BOOT_MAGIC_SIZE) {
		fastboot_fail(phandle, "incoming data read error, cannot read boot header");
		return;
		}
		@@ -287,7 +307,10 @@ static void cmd_flash(struct protocol_handle phandle, const char arg)

		partition = flash_get_partiton(path);

		sz = get_file_size64(phandle->download_fd);
		sz = get_file_size64(data_fd);

		sz -= header_sz;

		if (sz > get_file_size64(partition)) {
		flash_close(partition);
		D(WARN, "size of file too large");
		@@ -304,6 +327,8 @@ static void cmd_flash(struct protocol_handle phandle, const char arg)
		D(INFO, "partition '%s' updated\n", arg);

		flash_close(partition);
		close(data_fd);
		//TODO: check who is closing phandle->download_fd

		fastboot_okay(phandle, "");
		}

fastbootd/commands/flash.c

+47 −0

Original line number	Diff line number	Diff line
		@@ -39,6 +39,9 @@
		#include "utils.h"
		#include "commands/partitions.h"

		#ifdef FLASH_CERT
		#include "secure.h"
		#endif

		#define ALLOWED_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-."
		#define BUFFER_SIZE 1024 * 1024
		@@ -112,3 +115,47 @@ int flash_write(int partition_fd, int data_fd, ssize_t size, ssize_t skip)

		return 0;
		}

		#ifdef FLASH_CERT

		int flash_validate_certificate(int signed_fd, int *data_fd) {
		int ret = 0;
		const char *cert_path;
		X509_STORE *store = NULL;
		CMS_ContentInfo *content_info;
		BIO *content;

		cert_path = fastboot_getvar("certificate-path");
		if (!strcmp(cert_path, "")) {
		D(ERR, "could not find cert-key value in config file");
		goto finish;
		}

		store = cert_store_from_path(cert_path);
		if (store == NULL) {
		D(ERR, "unable to create certification store");
		goto finish;
		}

		if (cert_read(signed_fd, &content_info, &content)) {
		D(ERR, "reading data failed");
		goto finish;
		}

		ret = cert_verify(content, content_info, store, data_fd);
		cert_release(content, content_info);

		return ret;

		finish:
		if (store != NULL)
		cert_release_store(store);

		return ret;
		}

		#else
		int flash_validate_certificate(int signed_fd, int *data_fd) {
		return 1;
		}
		#endif

fastbootd/commands/flash.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -58,5 +58,7 @@ static inline ssize_t read_data_once(int fd, char *buffer, ssize_t size) {
		return readcount;
		}

		int flash_validate_certificate(int signed_fd, int *data_fd);

		#endif

fastbootd/fastbootd.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@

		#include "debug.h"
		#include "trigger.h"
		#include "secure.h"

		unsigned int debug_level = DEBUG;

		@@ -36,6 +37,7 @@ int main(int argc, char **argv)
		klog_init();
		klog_set_level(6);

		cert_init_crypto();
		config_init();
		load_trigger();
		commands_init();