Add options for embedding the public key esl(efi signature list) file to the platform's dtb. The esl file is then retrieved and used for authenticating the capsule to be used for updating firmare components on the platform.
The esl file can now be embedded in the dtb by invoking the following command mkeficapsule -K <pub_key.esl> -D <dtb>
This will create a node named 'signature' in the dtb, and the esl file will be stored as 'capsule-key'
Signed-off-by: Sughosh Ganu sughosh.ganu@linaro.org --- tools/Makefile | 1 + tools/mkeficapsule.c | 198 ++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 186 insertions(+), 13 deletions(-)
diff --git a/tools/Makefile b/tools/Makefile index 66d9376803..6d7b48fb57 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -218,6 +218,7 @@ hostprogs-$(CONFIG_MIPS) += mips-relocs hostprogs-$(CONFIG_ASN1_COMPILER) += asn1_compiler HOSTCFLAGS_asn1_compiler.o = -idirafter $(srctree)/include
+mkeficapsule-objs := mkeficapsule.o $(LIBFDT_OBJS) hostprogs-$(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) += mkeficapsule
# We build some files with extra pedantic flags to try to minimize things diff --git a/tools/mkeficapsule.c b/tools/mkeficapsule.c index 45e27d74a5..ce05da12d6 100644 --- a/tools/mkeficapsule.c +++ b/tools/mkeficapsule.c @@ -4,16 +4,22 @@ * Author: AKASHI Takahiro */
+#include <errno.h> #include <getopt.h> #include <malloc.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <unistd.h> #include <linux/types.h> + +#include <sys/mman.h> #include <sys/stat.h> #include <sys/types.h>
+#include "fdt_host.h" + typedef __u8 u8; typedef __u16 u16; typedef __u32 u32; @@ -23,6 +29,8 @@ typedef __s32 s32;
#define aligned_u64 __aligned_u64
+#define SIGNATURE_NODENAME "signature" + #ifndef __packed #define __packed __attribute__((packed)) #endif @@ -43,6 +51,8 @@ static struct option options[] = { {"raw", required_argument, NULL, 'r'}, {"index", required_argument, NULL, 'i'}, {"instance", required_argument, NULL, 'I'}, + {"dtb", required_argument, NULL, 'D'}, + {"public key", required_argument, NULL, 'K'}, {"version", required_argument, NULL, 'v'}, {"help", no_argument, NULL, 'h'}, {NULL, 0, NULL, 0}, @@ -52,15 +62,154 @@ static void print_usage(void) { printf("Usage: %s [options] <output file>\n" "Options:\n" - "\t--fit <fit image> new FIT image file\n" - "\t--raw <raw image> new raw image file\n" - "\t--index <index> update image index\n" - "\t--instance <instance> update hardware instance\n" - "\t--version <version> firmware version\n" - "\t--help print a help message\n", + "\t--fit <fit image> new FIT image file\n" + "\t--raw <raw image> new raw image file\n" + "\t--index <index> update image index\n" + "\t--instance <instance> update hardware instance\n" + "\t--version <version> firmware version\n" + "\t--public-key <key file> public key esl file\n" + "\t--dtb <dtb file> dtb file\n" + "\t--help print a help message\n", tool_name); }
+static int fdt_add_pub_key_data(void *sptr, void *dptr, size_t key_size) +{ + int parent; + int ret = 0; + + parent = fdt_subnode_offset(dptr, 0, SIGNATURE_NODENAME); + if (parent == -FDT_ERR_NOTFOUND) { + parent = fdt_add_subnode(dptr, 0, SIGNATURE_NODENAME); + if (parent < 0) { + ret = parent; + if (ret != -FDT_ERR_NOSPACE) { + fprintf(stderr, + "Couldn't create signature node: %s\n", + fdt_strerror(parent)); + } + } + } + if (ret) + goto done; + + /* Write the key to the FDT node */ + ret = fdt_setprop(dptr, parent, "capsule-key", + sptr, key_size); + +done: + if (ret) + ret = ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO; + + return ret; +} + +static int add_public_key(const char *pkey_file, const char *dtb_file) +{ + int ret; + int srcfd = 0; + int destfd = 0; + void *sptr = NULL; + void *dptr = NULL; + off_t src_size; + struct stat pub_key; + struct stat dtb; + + /* Find out the size of the public key */ + srcfd = open(pkey_file, O_RDONLY); + if (srcfd == -1) { + fprintf(stderr, "%s: Can't open %s: %s\n", + __func__, pkey_file, strerror(errno)); + goto err; + } + + ret = fstat(srcfd, &pub_key); + if (ret == -1) { + fprintf(stderr, "%s: Can't stat %s: %s\n", + __func__, pkey_file, strerror(errno)); + goto err; + } + + src_size = pub_key.st_size; + + /* mmap the public key esl file */ + sptr = mmap(0, src_size, PROT_READ, MAP_SHARED, srcfd, 0); + if ((sptr == MAP_FAILED) || (errno != 0)) { + fprintf(stderr, "%s: Failed to mmap %s:%s\n", + __func__, pkey_file, strerror(errno)); + goto err; + } + + /* Open the dest FDT */ + destfd = open(dtb_file, O_RDWR); + if (destfd == -1) { + fprintf(stderr, "%s: Can't open %s: %s\n", + __func__, dtb_file, strerror(errno)); + goto err; + } + + ret = fstat(destfd, &dtb); + if (ret == -1) { + fprintf(stderr, "%s: Can't stat %s: %s\n", + __func__, dtb_file, strerror(errno)); + goto err; + } + + dtb.st_size += src_size; + if (ftruncate(destfd, dtb.st_size)) { + fprintf(stderr, "%s: Can't expand %s: %s\n", + __func__, dtb_file, strerror(errno)); + goto err;; + } + + errno = 0; + /* mmap the dtb file */ + dptr = mmap(0, dtb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, + destfd, 0); + if ((dptr == MAP_FAILED) || (errno != 0)) { + fprintf(stderr, "%s: Failed to mmap %s:%s\n", + __func__, dtb_file, strerror(errno)); + goto err; + } + + if (fdt_check_header(dptr)) { + fprintf(stderr, "%s: Invalid FDT header\n", __func__); + goto err; + } + + ret = fdt_open_into(dptr, dptr, dtb.st_size); + if (ret) { + fprintf(stderr, "%s: Cannot expand FDT: %s\n", + __func__, fdt_strerror(ret)); + goto err; + } + + /* Copy the esl file to the expanded FDT */ + ret = fdt_add_pub_key_data(sptr, dptr, src_size); + if (ret < 0) { + fprintf(stderr, "%s: Unable to add public key to the FDT\n", + __func__); + goto err; + } + + return 0; + +err: + if (sptr) + munmap(sptr, src_size); + + if (dptr) + munmap(dptr, dtb.st_size); + + if (srcfd >= 0) + close(srcfd); + + if (destfd >= 0) + close(destfd); + + return -1; +} + static int create_fwbin(char *path, char *bin, efi_guid_t *guid, unsigned long version, unsigned long index, unsigned long instance) @@ -171,17 +320,22 @@ err_1: int main(int argc, char **argv) { char *file; + char *pkey_file; + char *dtb_file; efi_guid_t *guid; unsigned long index, instance, version; int c, idx; + int ret;
file = NULL; + pkey_file = NULL; + dtb_file = NULL; guid = NULL; index = 0; instance = 0; version = 0; for (;;) { - c = getopt_long(argc, argv, "f:r:i:I:v:h", options, &idx); + c = getopt_long(argc, argv, "f:r:i:I:v:D:K:h", options, &idx); if (c == -1) break;
@@ -211,22 +365,40 @@ int main(int argc, char **argv) case 'v': version = strtoul(optarg, NULL, 0); break; + case 'K': + if (pkey_file) { + printf("Public Key already specified\n"); + return -1; + } + pkey_file = optarg; + break; + case 'D': + if (dtb_file) { + printf("DTB file already specified\n"); + return -1; + } + dtb_file = optarg; + break; case 'h': print_usage(); return 0; } }
- /* need a output file */ - if (argc != optind + 1) { + /* need a fit image file or raw image file */ + if (!file && !pkey_file && !dtb_file) { print_usage(); return -1; }
- /* need a fit image file or raw image file */ - if (!file) { - print_usage(); - return -1; + if (pkey_file && dtb_file) { + ret = add_public_key(pkey_file, dtb_file); + if (ret == -1) { + printf("Adding public key to the dtb failed\n"); + return -1; + } else { + return 0; + } }
if (create_fwbin(argv[optind], file, guid, version, index, instance)