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mkeficapsule: Add support for generating empty capsules

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The Dependable Boot specification[1] describes the structure of the
firmware accept and revert capsules. These are empty capsules which
are used for signalling the acceptance or rejection of the updated
firmware by the OS. Add support for generating these empty capsules.

[1] - https://git.codelinaro.org/linaro/dependable-boot/mbfw/uploads/6f7ddfe3be24e18d4319e108a758d02e/mbfw.pdf

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
This commit is contained in:
Sughosh Ganu 2022-10-21 18:16:06 +05:30 committed by Tom Rini
parent 873cf8ac70
commit 6da9271af1
3 changed files with 119 additions and 14 deletions
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29
doc/mkeficapsule.1
View file

@ -8,7 +8,7 @@ mkeficapsule \- Generate EFI capsule file for U-Boot
.SH SYNOPSIS
.B mkeficapsule
.RI [ options "] " image-blob " " capsule-file
.RI [ options ] " " [ image-blob ] " " capsule-file
.SH "DESCRIPTION"
.B mkeficapsule
@ -23,8 +23,13 @@ Optionally, a capsule file can be signed with a given private key.
In this case, the update will be authenticated by verifying the signature
before applying.
Additionally, an empty capsule file can be generated for acceptance or
rejection of firmware images by a governing component like an Operating
System. The empty capsules do not require an image-blob input file.
.B mkeficapsule
takes any type of image files, including:
takes any type of image files when generating non empty capsules, including:
.TP
.I raw image
format is a single binary blob of any type of firmware.
@ -36,18 +41,16 @@ multiple binary blobs in a single capsule file.
This type of image file can be generated by
.BR mkimage .
.PP
If you want to use other types than above two, you should explicitly
specify a guid for the FMP driver.
.SH "OPTIONS"
.TP
.BI "-g\fR,\fB --guid " guid-string
Specify guid for image blob type. The format is:
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
The first three elements are in little endian, while the rest
is in big endian.
is in big endian. The option must be specified for all non empty and
image acceptance capsules
.TP
.BI "-i\fR,\fB --index " index
@ -57,6 +60,18 @@ Specify an image index
.BI "-I\fR,\fB --instance " instance
Specify a hardware instance
.PP
For generation of firmware accept empty capsule
.BR --guid
is mandatory
.TP
.BI "-A\fR,\fB --fw-accept "
Generate a firmware acceptance empty capsule
.TP
.BI "-R\fR,\fB --fw-revert "
Generate a firmware revert empty capsule
.TP
.BR -h ", " --help
Print a help message

8
tools/eficapsule.h
View file

@ -41,6 +41,14 @@ typedef struct {
EFI_GUID(0x4aafd29d, 0x68df, 0x49ee, 0x8a, 0xa9, \
0x34, 0x7d, 0x37, 0x56, 0x65, 0xa7)
#define FW_ACCEPT_OS_GUID \
EFI_GUID(0x0c996046, 0xbcc0, 0x4d04, 0x85, 0xec, \
0xe1, 0xfc, 0xed, 0xf1, 0xc6, 0xf8)
#define FW_REVERT_OS_GUID \
EFI_GUID(0xacd58b4b, 0xc0e8, 0x475f, 0x99, 0xb5, \
0x6b, 0x3f, 0x7e, 0x07, 0xaa, 0xf0)
/* flags */
#define CAPSULE_FLAGS_PERSIST_ACROSS_RESET 0x00010000

96
tools/mkeficapsule.c
View file

@ -29,7 +29,13 @@ static const char *tool_name = "mkeficapsule";
efi_guid_t efi_guid_fm_capsule = EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
static const char *opts_short = "g:i:I:v:p:c:m:dh";
static const char *opts_short = "g:i:I:v:p:c:m:dhAR";
enum {
CAPSULE_NORMAL_BLOB = 0,
CAPSULE_ACCEPT,
CAPSULE_REVERT,
} capsule_type;
static struct option options[] = {
{"guid", required_argument, NULL, 'g'},
@ -39,6 +45,8 @@ static struct option options[] = {
{"certificate", required_argument, NULL, 'c'},
{"monotonic-count", required_argument, NULL, 'm'},
{"dump-sig", no_argument, NULL, 'd'},
{"fw-accept", no_argument, NULL, 'A'},
{"fw-revert", no_argument, NULL, 'R'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0},
};
@ -55,6 +63,8 @@ static void print_usage(void)
"\t-c, --certificate <cert file> signer's certificate file\n"
"\t-m, --monotonic-count <count> monotonic count\n"
"\t-d, --dump_sig dump signature (*.p7)\n"
"\t-A, --fw-accept firmware accept capsule, requires GUID, no image blob\n"
"\t-R, --fw-revert firmware revert capsule, takes no GUID, no image blob\n"
"\t-h, --help print a help message\n",
tool_name);
}
@ -564,6 +574,49 @@ void convert_uuid_to_guid(unsigned char *buf)
buf[7] = c;
}
static int create_empty_capsule(char *path, efi_guid_t *guid, bool fw_accept)
{
struct efi_capsule_header header = { 0 };
FILE *f = NULL;
int ret = -1;
efi_guid_t fw_accept_guid = FW_ACCEPT_OS_GUID;
efi_guid_t fw_revert_guid = FW_REVERT_OS_GUID;
efi_guid_t capsule_guid;
f = fopen(path, "w");
if (!f) {
fprintf(stderr, "cannot open %s\n", path);
goto err;
}
capsule_guid = fw_accept ? fw_accept_guid : fw_revert_guid;
memcpy(&header.capsule_guid, &capsule_guid, sizeof(efi_guid_t));
header.header_size = sizeof(header);
header.flags = 0;
header.capsule_image_size = fw_accept ?
sizeof(header) + sizeof(efi_guid_t) : sizeof(header);
if (write_capsule_file(f, &header, sizeof(header),
"Capsule header"))
goto err;
if (fw_accept) {
if (write_capsule_file(f, guid, sizeof(*guid),
"FW Accept Capsule Payload"))
goto err;
}
ret = 0;
err:
if (f)
fclose(f);
return ret;
}
/**
* main - main entry function of mkeficapsule
* @argc: Number of arguments
@ -592,6 +645,7 @@ int main(int argc, char **argv)
privkey_file = NULL;
cert_file = NULL;
dump_sig = 0;
capsule_type = CAPSULE_NORMAL_BLOB;
for (;;) {
c = getopt_long(argc, argv, opts_short, options, &idx);
if (c == -1)
@ -639,22 +693,50 @@ int main(int argc, char **argv)
case 'd':
dump_sig = 1;
break;
case 'h':
case 'A':
if (capsule_type) {
fprintf(stderr,
"Select either of Accept or Revert capsule generation\n");
exit(1);
}
capsule_type = CAPSULE_ACCEPT;
break;
case 'R':
if (capsule_type) {
fprintf(stderr,
"Select either of Accept or Revert capsule generation\n");
exit(1);
}
capsule_type = CAPSULE_REVERT;
break;
default:
print_usage();
exit(EXIT_SUCCESS);
}
}
/* check necessary parameters */
if ((argc != optind + 2) || !guid ||
((privkey_file && !cert_file) ||
(!privkey_file && cert_file))) {
if ((capsule_type == CAPSULE_NORMAL_BLOB &&
((argc != optind + 2) || !guid ||
((privkey_file && !cert_file) ||
(!privkey_file && cert_file)))) ||
(capsule_type != CAPSULE_NORMAL_BLOB &&
((argc != optind + 1) ||
((capsule_type == CAPSULE_ACCEPT) && !guid) ||
((capsule_type == CAPSULE_REVERT) && guid)))) {
print_usage();
exit(EXIT_FAILURE);
}
if (create_fwbin(argv[argc - 1], argv[argc - 2], guid, index, instance,
mcount, privkey_file, cert_file) < 0) {
if (capsule_type != CAPSULE_NORMAL_BLOB) {
if (create_empty_capsule(argv[argc - 1], guid,
capsule_type == CAPSULE_ACCEPT) < 0) {
fprintf(stderr, "Creating empty capsule failed\n");
exit(EXIT_FAILURE);
}
} else if (create_fwbin(argv[argc - 1], argv[argc - 2], guid,
index, instance, mcount, privkey_file,
cert_file) < 0) {
fprintf(stderr, "Creating firmware capsule failed\n");
exit(EXIT_FAILURE);
}