[PATCH 1/4] tools: mkeficapsule: add firmwware image signing

Heinrich Schuchardt
2021-05-13T05:35:36Z

On 5/13/21 7:00 AM, AKASHI Takahiro wrote:
> On Thu, May 13, 2021 at 06:22:39AM +0200, Heinrich Schuchardt wrote:
>> On 5/13/21 5:08 AM, AKASHI Takahiro wrote:
>>> On Wed, May 12, 2021 at 10:56:41AM +0200, Heinrich Schuchardt wrote:
>>>> On 12.05.21 06:57, AKASHI Takahiro wrote:
>>>>> With this enhancement, mkeficapsule will be able to create a capsule
>>>>> file with a signature which will be verified later by FMP's SetImage().
>>>>>
>>>>> We will have to specify addtional command parameters:
>>>>> -monotonic-cout <count> : monotonic count
>>>>> -private-key <private key file> : private key file
>>>>> -certificate <certificate file> : certificate file
>>>>> Only when those parameters are given, a signature will be added
>>>>> to a capsule file.
>>>>>
>>>>> Users are expected to maintain the monotonic count for each firmware
>>>>> image.
>>>>>
>>>>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
>>>>> ---
>>>>> tools/Makefile | 4 +
>>>>> tools/mkeficapsule.c | 324 +++++++++++++++++++++++++++++++++++++++----
>>>>> 2 files changed, 303 insertions(+), 25 deletions(-)
>>>>>
>>>>> diff --git a/tools/Makefile b/tools/Makefile
>>>>> index d020c55d6644..02eae0286e20 100644
>>>>> --- a/tools/Makefile
>>>>> +++ b/tools/Makefile
>>>>> @@ -231,6 +231,10 @@ hostprogs-$(CONFIG_MIPS) += mips-relocs
>>>>> hostprogs-$(CONFIG_ASN1_COMPILER) += asn1_compiler
>>>>> HOSTCFLAGS_asn1_compiler.o = -idirafter $(srctree)/include
>>>>>
>>>>> +ifneq ($(CONFIG_EFI_CAPSULE_AUTHENTICATE),)
>>>>> +HOSTLDLIBS_mkeficapsule += \
>>>>> + $(shell pkg-config --libs libssl libcrypto 2> /dev/null || echo "-lssl -lcrypto")
>>>>
>>>> I don't expect any user wants to install two tool versions in parallel.
>>>>
>>>> The tool should always be able to add a signature.
>>>> Adding a signature must be optional.
>>>
>>> It seems to me that those two statements mutually contradict.
>>> Or do you intend to say that we should have a separate kconfig
>>> option to enable/disable signing feature in mkeficapsule?
>>>
>>> If so, I can agree.
>>>
>>> In either way, we should have an option to turn on/off this functionality
>>> as not all users use signed capsules.
>>
>> I want to have a single binary to distribute with Linux distros (e.g.
>> Debian/Ubuntu package u-boot-tools).
>>
>> This should allow both
>>
>> - create signed capsules
>> - create unsigned capsules
>>
>> The user shall select signing via command line parameters.
>>
>> Support for signing via the tool shall not depend on board Kconfig
>> parameters.
>
> That is why I proposed that we create a new kconfig option.

What do you want to configure? Signing shall always be enabled in
mkeficapsule.

>
> Please note that enabling signing feature in mkeficapsule
> requires openssl library, and we should not enforce users who don't
> need this feature to install an unnecessary package.

Why? There are dozens of other packages depending on OpenSSL on a
developer's machine.

Best regards

Heinrich

>
> -Takahiro Akashi
>
>> Best regards
>>
>> Heinrich
>>
>>>
>>>>> +endif
>>>>> mkeficapsule-objs := mkeficapsule.o $(LIBFDT_OBJS)
>>>>> hostprogs-$(CONFIG_EFI_HAVE_CAPSULE_SUPPORT) += mkeficapsule
>>>>>
>>>>> diff --git a/tools/mkeficapsule.c b/tools/mkeficapsule.c
>>>>> index de0a62898886..34ff1bdd82eb 100644
>>>>> --- a/tools/mkeficapsule.c
>>>>> +++ b/tools/mkeficapsule.c
>>>>> @@ -18,7 +18,17 @@
>>>>> #include <sys/stat.h>
>>>>> #include <sys/types.h>
>>>>>
>>>>> -#include "fdt_host.h"
>>>>> +#include <linux/kconfig.h>
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>>> +#include <openssl/asn1.h>
>>>>> +#include <openssl/bio.h>
>>>>> +#include <openssl/evp.h>
>>>>> +#include <openssl/err.h>
>>>>> +#include <openssl/pem.h>
>>>>> +#include <openssl/pkcs7.h>
>>>>> +#endif
>>>>> +
>>>>> +#include <linux/libfdt.h>
>>>>>
>>>>> typedef __u8 u8;
>>>>> typedef __u16 u16;
>>>>> @@ -46,6 +56,13 @@ efi_guid_t efi_guid_image_type_uboot_fit =
>>>>> EFI_FIRMWARE_IMAGE_TYPE_UBOOT_FIT_GUID;
>>>>> efi_guid_t efi_guid_image_type_uboot_raw =
>>>>> EFI_FIRMWARE_IMAGE_TYPE_UBOOT_RAW_GUID;
>>>>> +efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
>>>>> +
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>>> +static const char *opts_short = "f:r:i:I:v:D:K:P:C:m:dOh";
>>>>> +#else
>>>>> +static const char *opts_short = "f:r:i:I:v:D:K:Oh";
>>>>> +#endif
>>>>>
>>>>> static struct option options[] = {
>>>>> {"fit", required_argument, NULL, 'f'},
>>>>> @@ -54,6 +71,12 @@ static struct option options[] = {
>>>>> {"instance", required_argument, NULL, 'I'},
>>>>> {"dtb", required_argument, NULL, 'D'},
>>>>> {"public key", required_argument, NULL, 'K'},
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>> + {"private-key", required_argument, NULL, 'P'},
>>>>> + {"certificate", required_argument, NULL, 'C'},
>>>>> + {"monotonic-count", required_argument, NULL, 'm'},
>>>>
>>>> These options should not be required.
>>>
>>> I don't get you. What do you mean?
>>>
>>>>> + {"dump-sig", no_argument, NULL, 'd'},
>>>>> +#endif
>>>>> {"overlay", no_argument, NULL, 'O'},
>>>>> {"help", no_argument, NULL, 'h'},
>>>>> {NULL, 0, NULL, 0},
>>>>> @@ -70,6 +93,12 @@ static void print_usage(void)
>>>>> "\t-I, --instance <instance> update hardware instance\n"
>>>>> "\t-K, --public-key <key file> public key esl file\n"
>>>>> "\t-D, --dtb <dtb file> dtb file\n"
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>>> + "\t-P, --private-key <privkey file> private key file\n"
>>>>> + "\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"
>>>>> +#endif
>>>>> "\t-O, --overlay the dtb file is an overlay\n"
>>>>> "\t-h, --help print a help message\n",
>>>>> tool_name);
>>>>> @@ -249,12 +278,167 @@ err:
>>>>> return ret;
>>>>> }
>>>>>
>>>>> +struct auth_context {
>>>>> + char *key_file;
>>>>> + char *cert_file;
>>>>> + u8 *image_data;
>>>>> + size_t image_size;
>>>>> + struct efi_firmware_image_authentication auth;
>>>>> + u8 *sig_data;
>>>>> + size_t sig_size;
>>>>> +};
>>>>> +
>>>>> +static int dump_sig;
>>>>> +
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>>> +static EVP_PKEY *fileio_read_pkey(const char *filename)
>>>>> +{
>>>>> + EVP_PKEY *key = NULL;
>>>>> + BIO *bio;
>>>>> +
>>>>> + bio = BIO_new_file(filename, "r");
>>>>> + if (!bio)
>>>>> + goto out;
>>>>> +
>>>>> + key = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
>>>>> +
>>>>> +out:
>>>>> + BIO_free_all(bio);
>>>>> + if (!key) {
>>>>> + printf("Can't load key from file '%s'\n", filename);
>>>>
>>>> Please, you use fprintf(stderr,) for error messages.
>>>>
>>>>> + ERR_print_errors_fp(stderr);
>>>>> + }
>>>>> +
>>>>> + return key;
>>>>> +}
>>>>> +
>>>>> +static X509 *fileio_read_cert(const char *filename)
>>>>> +{
>>>>> + X509 *cert = NULL;
>>>>> + BIO *bio;
>>>>> +
>>>>> + bio = BIO_new_file(filename, "r");
>>>>> + if (!bio)
>>>>> + goto out;
>>>>> +
>>>>> + cert = PEM_read_bio_X509(bio, NULL, NULL, NULL);
>>>>> +
>>>>> +out:
>>>>> + BIO_free_all(bio);
>>>>> + if (!cert) {
>>>>> + printf("Can't load certificate from file '%s'\n", filename);
>>>>
>>>> fprintf(stderr,)
>>>>
>>>>> + ERR_print_errors_fp(stderr);
>>>>> + }
>>>>> +
>>>>> + return cert;
>>>>> +}
>>>>> +
>>>>> +static int create_auth_data(struct auth_context *ctx)
>>>>> +{
>>>>> + EVP_PKEY *key = NULL;
>>>>> + X509 *cert = NULL;
>>>>> + BIO *data_bio = NULL;
>>>>> + const EVP_MD *md;
>>>>> + PKCS7 *p7;
>>>>> + int flags, ret = -1;
>>>>> +
>>>>> + OpenSSL_add_all_digests();
>>>>> + OpenSSL_add_all_ciphers();
>>>>> + ERR_load_crypto_strings();
>>>>> +
>>>>> + key = fileio_read_pkey(ctx->key_file);
>>>>> + if (!key)
>>>>> + goto err;
>>>>> + cert = fileio_read_cert(ctx->cert_file);
>>>>> + if (!cert)
>>>>> + goto err;
>>>>> +
>>>>> + /*
>>>>> + * create a BIO, containing:
>>>>> + * * firmware image
>>>>> + * * monotonic count
>>>>> + * in this order!
>>>>> + * See EDK2's FmpAuthenticatedHandlerRsa2048Sha256()
>>>>> + */
>>>>> + data_bio = BIO_new(BIO_s_mem());
>>>>> + BIO_write(data_bio, ctx->image_data, ctx->image_size);
>>>>> + BIO_write(data_bio, &ctx->auth.monotonic_count,
>>>>> + sizeof(ctx->auth.monotonic_count));
>>>>> +
>>>>> + md = EVP_get_digestbyname("SHA256");
>>>>> + if (!md)
>>>>> + goto err;
>>>>> +
>>>>> + /* create signature */
>>>>> + /* TODO: maybe add PKCS7_NOATTR and PKCS7_NOSMIMECAP */
>>>>
>>>> PKCS7_NOATTR is a value without any documentation in the code.
>>>
>>> Nak.
>>> Those macros are part of openssl library. See openssl/pkcs7.h.
>>>
>>>> Please, replace variable names by a long text describing what it missing.
>>>>
>>>>> + flags = PKCS7_BINARY | PKCS7_DETACHED;
>>>>
>>>> Those constants lack documentation in the code.
>>>
>>> Nak again.
>>>
>>>>> + p7 = PKCS7_sign(NULL, NULL, NULL, data_bio, flags | PKCS7_PARTIAL);
>>>>> + if (!p7)
>>>>> + goto err;
>>>>> + if (!PKCS7_sign_add_signer(p7, cert, key, md, flags))
>>>>> + goto err;
>>>>> + if (!PKCS7_final(p7, data_bio, flags))
>>>>> + goto err;
>>>>> +
>>>>> + /* convert pkcs7 into DER */
>>>>> + ctx->sig_data = NULL;
>>>>> + ctx->sig_size = ASN1_item_i2d((ASN1_VALUE *)p7, &ctx->sig_data,
>>>>> + ASN1_ITEM_rptr(PKCS7));
>>>>> + if (!ctx->sig_size)
>>>>> + goto err;
>>>>> +
>>>>> + /* fill auth_info */
>>>>> + ctx->auth.auth_info.hdr.dwLength = sizeof(ctx->auth.auth_info)
>>>>> + + ctx->sig_size;
>>>>> + ctx->auth.auth_info.hdr.wRevision = WIN_CERT_REVISION_2_0;
>>>>> + ctx->auth.auth_info.hdr.wCertificateType = WIN_CERT_TYPE_EFI_GUID;
>>>>> + memcpy(&ctx->auth.auth_info.cert_type, &efi_guid_cert_type_pkcs7,
>>>>> + sizeof(efi_guid_cert_type_pkcs7));
>>>>> +
>>>>> + ret = 0;
>>>>> +err:
>>>>> + BIO_free_all(data_bio);
>>>>> + EVP_PKEY_free(key);
>>>>> + X509_free(cert);
>>>>> +
>>>>> + return ret;
>>>>> +}
>>>>> +
>>>>> +static int dump_signature(const char *path, u8 *signature, size_t sig_size)
>>>>> +{
>>>>> + char *sig_path;
>>>>> + FILE *f;
>>>>> + size_t size;
>>>>> + int ret = -1;
>>>>> +
>>>>> + sig_path = malloc(strlen(path) + 3 + 1);
>>>>> + if (!sig_path)
>>>>> + return ret;
>>>>> +
>>>>> + sprintf(sig_path, "%s.p7", path);
>>>>> + f = fopen(sig_path, "w");
>>>>> + if (!f)
>>>>> + goto err;
>>>>> +
>>>>> + size = fwrite(signature, 1, sig_size, f);
>>>>> + if (size == sig_size)
>>>>> + ret = 0;
>>>>> +
>>>>> + fclose(f);
>>>>> +err:
>>>>> + free(sig_path);
>>>>> + return ret;
>>>>> +}
>>>>> +#endif
>>>>> +
>>>>> static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> - unsigned long index, unsigned long instance)
>>>>> + unsigned long index, unsigned long instance,
>>>>> + uint64_t mcount, char *privkey_file, char *cert_file)
>>>>> {
>>>>> struct efi_capsule_header header;
>>>>> struct efi_firmware_management_capsule_header capsule;
>>>>> struct efi_firmware_management_capsule_image_header image;
>>>>> + struct auth_context auth_context;
>>>>> FILE *f, *g;
>>>>> struct stat bin_stat;
>>>>> u8 *data;
>>>>> @@ -266,6 +450,7 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> printf("\tbin: %s\n\ttype: %pUl\n", bin, guid);
>>>>> printf("\tindex: %ld\n\tinstance: %ld\n", index, instance);
>>>>> #endif
>>>>> + auth_context.sig_size = 0;
>>>>>
>>>>> g = fopen(bin, "r");
>>>>> if (!g) {
>>>>> @@ -281,11 +466,36 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> printf("cannot allocate memory: %zx\n", (size_t)bin_stat.st_size);
>>>>> goto err_1;
>>>>> }
>>>>> - f = fopen(path, "w");
>>>>> - if (!f) {
>>>>> - printf("cannot open %s\n", path);
>>>>> +
>>>>> + size = fread(data, 1, bin_stat.st_size, g);
>>>>> + if (size < bin_stat.st_size) {
>>>>> + printf("read failed (%zx)\n", size);
>>>>> goto err_2;
>>>>> }
>>>>> +
>>>>> + /* first, calculate signature to determine its size */
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>>> + if (privkey_file && cert_file) {
>>>>> + auth_context.key_file = privkey_file;
>>>>> + auth_context.cert_file = cert_file;
>>>>> + auth_context.auth.monotonic_count = mcount;
>>>>> + auth_context.image_data = data;
>>>>> + auth_context.image_size = bin_stat.st_size;
>>>>> +
>>>>> + if (create_auth_data(&auth_context)) {
>>>>> + printf("Signing firmware image failed\n");
>>>>> + goto err_3;
>>>>> + }
>>>>> +
>>>>> + if (dump_sig &&
>>>>> + dump_signature(path, auth_context.sig_data,
>>>>> + auth_context.sig_size)) {
>>>>> + printf("Creating signature file failed\n");
>>>>> + goto err_3;
>>>>> + }
>>>>> + }
>>>>> +#endif
>>>>> +
>>>>> header.capsule_guid = efi_guid_fm_capsule;
>>>>> header.header_size = sizeof(header);
>>>>> /* TODO: The current implementation ignores flags */
>>>>> @@ -294,11 +504,20 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> + sizeof(capsule) + sizeof(u64)
>>>>> + sizeof(image)
>>>>> + bin_stat.st_size;
>>>>> + if (auth_context.sig_size)
>>>>> + header.capsule_image_size += sizeof(auth_context.auth)
>>>>> + + auth_context.sig_size;
>>>>> +
>>>>> + f = fopen(path, "w");
>>>>> + if (!f) {
>>>>> + printf("cannot open %s\n", path);
>>>>> + goto err_3;
>>>>> + }
>>>>>
>>>>> size = fwrite(&header, 1, sizeof(header), f);
>>>>> if (size < sizeof(header)) {
>>>>> printf("write failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> + goto err_4;
>>>>> }
>>>>>
>>>>> capsule.version = 0x00000001;
>>>>> @@ -307,13 +526,13 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> size = fwrite(&capsule, 1, sizeof(capsule), f);
>>>>> if (size < (sizeof(capsule))) {
>>>>> printf("write failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> + goto err_4;
>>>>> }
>>>>> offset = sizeof(capsule) + sizeof(u64);
>>>>> size = fwrite(&offset, 1, sizeof(offset), f);
>>>>> if (size < sizeof(offset)) {
>>>>> printf("write failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> + goto err_4;
>>>>> }
>>>>>
>>>>> image.version = 0x00000003;
>>>>> @@ -323,34 +542,61 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
>>>>> image.reserved[1] = 0;
>>>>> image.reserved[2] = 0;
>>>>> image.update_image_size = bin_stat.st_size;
>>>>> + if (auth_context.sig_size)
>>>>> + image.update_image_size += sizeof(auth_context.auth)
>>>>> + + auth_context.sig_size;
>>>>> image.update_vendor_code_size = 0; /* none */
>>>>> image.update_hardware_instance = instance;
>>>>> image.image_capsule_support = 0;
>>>>> + if (auth_context.sig_size)
>>>>> + image.image_capsule_support |= CAPSULE_SUPPORT_AUTHENTICATION;
>>>>>
>>>>> size = fwrite(&image, 1, sizeof(image), f);
>>>>> if (size < sizeof(image)) {
>>>>> printf("write failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> + goto err_4;
>>>>> }
>>>>> - size = fread(data, 1, bin_stat.st_size, g);
>>>>> - if (size < bin_stat.st_size) {
>>>>> - printf("read failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> +
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> We don't want to use #if if avoidable.
>>>
>>> For this specific chunk of code, we can remove #ifdef,
>>> but we should not remove #ifdef elsewhere.
>>>
>>> -Takahiro Akashi
>>>
>>>
>>>>> + if (auth_context.sig_size) {
>>>>> + size = fwrite(&auth_context.auth, 1,
>>>>> + sizeof(auth_context.auth), f);
>>>>> + if (size < sizeof(auth_context.auth)) {
>>>>> + printf("write failed (%zx)\n", size);
>>>>> + goto err_4;
>>>>> + }
>>>>> + size = fwrite(auth_context.sig_data, 1,
>>>>> + auth_context.sig_size, f);
>>>>> + if (size < auth_context.sig_size) {
>>>>> + printf("write failed (%zx)\n", size);
>>>>> + goto err_4;
>>>>> + }
>>>>> }
>>>>> +#endif
>>>>> +
>>>>> size = fwrite(data, 1, bin_stat.st_size, f);
>>>>> if (size < bin_stat.st_size) {
>>>>> printf("write failed (%zx)\n", size);
>>>>> - goto err_3;
>>>>> + goto err_4;
>>>>> }
>>>>>
>>>>> fclose(f);
>>>>> fclose(g);
>>>>> free(data);
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>> + if (auth_context.sig_size)
>>>>> + OPENSSL_free(auth_context.sig_data);
>>>>> +#endif
>>>>>
>>>>> return 0;
>>>>>
>>>>> -err_3:
>>>>> +err_4:
>>>>> fclose(f);
>>>>> +err_3:
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>> + if (auth_context.sig_size)
>>>>> + OPENSSL_free(auth_context.sig_data);
>>>>> +#endif
>>>>> err_2:
>>>>> free(data);
>>>>> err_1:
>>>>> @@ -359,10 +605,6 @@ err_1:
>>>>> return -1;
>>>>> }
>>>>>
>>>>> -/*
>>>>> - * Usage:
>>>>> - * $ mkeficapsule -f <firmware binary>
>>>>> - */
>>>>> int main(int argc, char **argv)
>>>>> {
>>>>> char *file;
>>>>> @@ -370,6 +612,8 @@ int main(int argc, char **argv)
>>>>> char *dtb_file;
>>>>> efi_guid_t *guid;
>>>>> unsigned long index, instance;
>>>>> + uint64_t mcount;
>>>>> + char *privkey_file, *cert_file;
>>>>> int c, idx;
>>>>> int ret;
>>>>> bool overlay = false;
>>>>> @@ -380,8 +624,12 @@ int main(int argc, char **argv)
>>>>> guid = NULL;
>>>>> index = 0;
>>>>> instance = 0;
>>>>> + mcount = 0;
>>>>> + privkey_file = NULL;
>>>>> + cert_file = NULL;
>>>>> + dump_sig = 0;
>>>>> for (;;) {
>>>>> - c = getopt_long(argc, argv, "f:r:i:I:v:D:K:Oh", options, &idx);
>>>>> + c = getopt_long(argc, argv, opts_short, options, &idx);
>>>>> if (c == -1)
>>>>> break;
>>>>>
>>>>> @@ -422,6 +670,28 @@ int main(int argc, char **argv)
>>>>> }
>>>>> dtb_file = optarg;
>>>>> break;
>>>>> +#if IS_ENABLED(CONFIG_EFI_CAPSULE_AUTHENTICATE)
>>>>
>>>> see above
>>>>
>>>> Best regards
>>>>
>>>> Heinrich
>>>>
>>>>> + case 'P':
>>>>> + if (privkey_file) {
>>>>> + printf("Private Key already specified\n");
>>>>> + return -1;
>>>>> + }
>>>>> + privkey_file = optarg;
>>>>> + break;
>>>>> + case 'C':
>>>>> + if (cert_file) {
>>>>> + printf("Certificate file already specified\n");
>>>>> + return -1;
>>>>> + }
>>>>> + cert_file = optarg;
>>>>> + break;
>>>>> + case 'm':
>>>>> + mcount = strtoul(optarg, NULL, 0);
>>>>> + break;
>>>>> + case 'd':
>>>>> + dump_sig = 1;
>>>>> + break;
>>>>> +#endif
>>>>> case 'O':
>>>>> overlay = true;
>>>>> break;
>>>>> @@ -431,8 +701,12 @@ int main(int argc, char **argv)
>>>>> }
>>>>> }
>>>>>
>>>>> - /* need a fit image file or raw image file */
>>>>> - if (!file && !pkey_file && !dtb_file) {
>>>>> + /* check necessary parameters */
>>>>> + if ((file && (!(optind < argc) ||
>>>>> + (privkey_file && !cert_file) ||
>>>>> + (!privkey_file && cert_file))) ||
>>>>> + ((pkey_file && !dtb_file) ||
>>>>> + (!pkey_file && dtb_file))) {
>>>>> print_usage();
>>>>> exit(EXIT_FAILURE);
>>>>> }
>>>>> @@ -442,12 +716,12 @@ int main(int argc, char **argv)
>>>>> if (ret == -1) {
>>>>> printf("Adding public key to the dtb failed\n");
>>>>> exit(EXIT_FAILURE);
>>>>> - } else {
>>>>> - exit(EXIT_SUCCESS);
>>>>> }
>>>>> }
>>>>>
>>>>> - if (create_fwbin(argv[optind], file, guid, index, instance)
>>>>> + if (optind < argc &&
>>>>> + create_fwbin(argv[optind], file, guid, index, instance,
>>>>> + mcount, privkey_file, cert_file)
>>>>> < 0) {
>>>>> printf("Creating firmware capsule failed\n");
>>>>> exit(EXIT_FAILURE);
>>>>>
>>>>
>>