Re: [PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
On Sun, May 10, 2020 at 04:56:21PM +0530, Sughosh Ganu wrote:
> On Fri, 8 May 2020 at 06:12, Akashi Takahiro
> wrote:
>
> > On Thu, May 07, 2020 at 05:20:35PM +0530, Sughosh Ganu wrote:
> > > On Thu, 7 May 2020 at 13:49, Akashi Takahiro > >
> > > wrote:
> > >
> > > > Sughosh,
> > > >
> > > > On Thu, Apr 30, 2020 at 11:06:28PM +0530, Sughosh Ganu wrote:
> > > > > Add support for authenticating uefi capsules. Most of the signature
> > > > > verification functionality is shared with the uefi secure boot
> > > > > feature.
> > > > >
> > > > > The root certificate containing the public key used for the signature
> > > > > verification is stored as an efi variable, similar to the variables
> > > > > used for uefi secure boot. The root certificate is stored as an efi
> > > > > signature list(esl) file -- this file contains the x509 certificate
> > > > > which is the root certificate.
> > > > >
> > > > > Signed-off-by: Sughosh Ganu
> > > > > ---
> > > > > include/efi_api.h | 17 +
> > > > > include/efi_loader.h | 8 ++-
> > > > > lib/efi_loader/Kconfig | 16 +
> > > > > lib/efi_loader/efi_capsule.c | 126
> > +
> > > > > lib/efi_loader/efi_signature.c | 4 +-
> > > > > 5 files changed, 167 insertions(+), 4 deletions(-)
> > > > >
> > > >
> > >
> > >
> > >
> > > > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > > > > index ec2976ceba..245deabbed 100644
> > > > > --- a/lib/efi_loader/Kconfig
> > > > > +++ b/lib/efi_loader/Kconfig
> > > > > @@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
> > > > > help
> > > > > Define storage device, say 1:1, for storing FIT image
> > > > >
> > > > > +config EFI_CAPSULE_AUTHENTICATE
> > > > > + bool "Update Capsule authentication"
> > > > > + depends on EFI_HAVE_CAPSULE_SUPPORT
> > > > > + depends on EFI_CAPSULE_ON_DISK
> > > > > + depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
> > > >
> > > > Do we need those two configurations?
> > > >
> > >
> > > Right, I think we can just do with the EFI_CAPSULE_ON_DISK. Will change.
> >
> > Actually I don't think we need EFI_CAPSULE_ON_DISK neither.
> >
>
> We at least need EFI_HAVE_CAPSULE_SUPPORT, isn't it.
Ah, yes of course.
-Takahiro Akashi
>
> >
> > >
> > > >
> > > > > + select SHA256
> > > > > + select RSA
> > > > > + select RSA_VERIFY
> > > > > + select RSA_VERIFY_WITH_PKEY
> > > > > + select X509_CERTIFICATE_PARSER
> > > > > + select PKCS7_MESSAGE_PARSER
> > > > > + default n
> > > > > + help
> > > > > + Select this option if you want to enable capsule
> > > > > + authentication
> > > > > +
> > > > > config EFI_DEVICE_PATH_TO_TEXT
> > > > > bool "Device path to text protocol"
> > > > > default y
> > > > > diff --git a/lib/efi_loader/efi_capsule.c
> > b/lib/efi_loader/efi_capsule.c
> > > > > index 931d363edc..a265d36ff0 100644
> > > > > --- a/lib/efi_loader/efi_capsule.c
> > > > > +++ b/lib/efi_loader/efi_capsule.c
> > > > > @@ -12,6 +12,10 @@
> > > > > #include
> > > > > #include
> > > > > #include
> > > > > +#include "../lib/crypto/pkcs7_parser.h"
> > > > > +
> > > >
> > > > As you might notice, the location was changed by
> > > > my recent patch.
> > > >
> > >
> > > Will check and update.
> > >
> > >
> > > >
> > > > > +#include
> > > > > +#include
> > > > >
> > > > > const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
> > > > > static const efi_guid_t efi_guid_firmware_management_capsule_id =
> > > > > @@ -245,6 +249,128 @@ out:
> > > > >
> > > > > return ret;
> > > > > }
> > > > > +
> > > > > +#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> > > > > +
> > > > > +const efi_guid_t efi_guid_capsule_root_cert_guid =
> > > > > + EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> > > > > +
> > > > > +__weak u16 *efi_get_truststore_name(void)
> > > > > +{
> > > > > + return L"CRT";
> > > >
> > > > This variable is not defined by UEFI specification, isn't it?
> > > > How can this variable be protected?
> > > >
> > >
> > > This is not part of the uefi specification. The uefi specification does
> > not
> > > mandate any particular method for storing the root certificate to be used
> > > for capsule authentication. The edk2 code gets the root certificate
> > through
> > > a pcd. I had tried using KEK variable for storing the root certificate,
> > and
> > > had also come up with an implementation. However, the addition/deletion
> > and
> > > update of the secure variables is very closely tied with the secure boot
> > > feature and the secure boot state of the system, which is the reason why
> > i
> > > dropped that solution and used a separate variable, which can be defined
> > by
> > > the vendor to store the root certificate.
> >
> > My concern is that, without any protection, the value of this variable
> > can be modified by a mal-user.
> > (One simple solution would be to set this variable read-only.)
> >
>
> Yes, that is
Re: [PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
On Fri, 8 May 2020 at 06:12, Akashi Takahiro
wrote:
> On Thu, May 07, 2020 at 05:20:35PM +0530, Sughosh Ganu wrote:
> > On Thu, 7 May 2020 at 13:49, Akashi Takahiro >
> > wrote:
> >
> > > Sughosh,
> > >
> > > On Thu, Apr 30, 2020 at 11:06:28PM +0530, Sughosh Ganu wrote:
> > > > Add support for authenticating uefi capsules. Most of the signature
> > > > verification functionality is shared with the uefi secure boot
> > > > feature.
> > > >
> > > > The root certificate containing the public key used for the signature
> > > > verification is stored as an efi variable, similar to the variables
> > > > used for uefi secure boot. The root certificate is stored as an efi
> > > > signature list(esl) file -- this file contains the x509 certificate
> > > > which is the root certificate.
> > > >
> > > > Signed-off-by: Sughosh Ganu
> > > > ---
> > > > include/efi_api.h | 17 +
> > > > include/efi_loader.h | 8 ++-
> > > > lib/efi_loader/Kconfig | 16 +
> > > > lib/efi_loader/efi_capsule.c | 126
> +
> > > > lib/efi_loader/efi_signature.c | 4 +-
> > > > 5 files changed, 167 insertions(+), 4 deletions(-)
> > > >
> > >
> >
> >
> >
> > > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > > > index ec2976ceba..245deabbed 100644
> > > > --- a/lib/efi_loader/Kconfig
> > > > +++ b/lib/efi_loader/Kconfig
> > > > @@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
> > > > help
> > > > Define storage device, say 1:1, for storing FIT image
> > > >
> > > > +config EFI_CAPSULE_AUTHENTICATE
> > > > + bool "Update Capsule authentication"
> > > > + depends on EFI_HAVE_CAPSULE_SUPPORT
> > > > + depends on EFI_CAPSULE_ON_DISK
> > > > + depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
> > >
> > > Do we need those two configurations?
> > >
> >
> > Right, I think we can just do with the EFI_CAPSULE_ON_DISK. Will change.
>
> Actually I don't think we need EFI_CAPSULE_ON_DISK neither.
>
We at least need EFI_HAVE_CAPSULE_SUPPORT, isn't it.
>
> >
> > >
> > > > + select SHA256
> > > > + select RSA
> > > > + select RSA_VERIFY
> > > > + select RSA_VERIFY_WITH_PKEY
> > > > + select X509_CERTIFICATE_PARSER
> > > > + select PKCS7_MESSAGE_PARSER
> > > > + default n
> > > > + help
> > > > + Select this option if you want to enable capsule
> > > > + authentication
> > > > +
> > > > config EFI_DEVICE_PATH_TO_TEXT
> > > > bool "Device path to text protocol"
> > > > default y
> > > > diff --git a/lib/efi_loader/efi_capsule.c
> b/lib/efi_loader/efi_capsule.c
> > > > index 931d363edc..a265d36ff0 100644
> > > > --- a/lib/efi_loader/efi_capsule.c
> > > > +++ b/lib/efi_loader/efi_capsule.c
> > > > @@ -12,6 +12,10 @@
> > > > #include
> > > > #include
> > > > #include
> > > > +#include "../lib/crypto/pkcs7_parser.h"
> > > > +
> > >
> > > As you might notice, the location was changed by
> > > my recent patch.
> > >
> >
> > Will check and update.
> >
> >
> > >
> > > > +#include
> > > > +#include
> > > >
> > > > const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
> > > > static const efi_guid_t efi_guid_firmware_management_capsule_id =
> > > > @@ -245,6 +249,128 @@ out:
> > > >
> > > > return ret;
> > > > }
> > > > +
> > > > +#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> > > > +
> > > > +const efi_guid_t efi_guid_capsule_root_cert_guid =
> > > > + EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> > > > +
> > > > +__weak u16 *efi_get_truststore_name(void)
> > > > +{
> > > > + return L"CRT";
> > >
> > > This variable is not defined by UEFI specification, isn't it?
> > > How can this variable be protected?
> > >
> >
> > This is not part of the uefi specification. The uefi specification does
> not
> > mandate any particular method for storing the root certificate to be used
> > for capsule authentication. The edk2 code gets the root certificate
> through
> > a pcd. I had tried using KEK variable for storing the root certificate,
> and
> > had also come up with an implementation. However, the addition/deletion
> and
> > update of the secure variables is very closely tied with the secure boot
> > feature and the secure boot state of the system, which is the reason why
> i
> > dropped that solution and used a separate variable, which can be defined
> by
> > the vendor to store the root certificate.
>
> My concern is that, without any protection, the value of this variable
> can be modified by a mal-user.
> (One simple solution would be to set this variable read-only.)
>
Yes, that is one solution. This will also be taken care of in a scenario
where the platform is booted in a trusted chain, and the env is also part
of the image which gets verified by the previous stage(e.g BL2) before
jumping to the u-boot image. If there is any change in the u-boot image,
that would result in a boot failure -- but that would need the env to be
part of the u-boot image whic
Re: [PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
On Thu, May 07, 2020 at 05:20:35PM +0530, Sughosh Ganu wrote:
> On Thu, 7 May 2020 at 13:49, Akashi Takahiro
> wrote:
>
> > Sughosh,
> >
> > On Thu, Apr 30, 2020 at 11:06:28PM +0530, Sughosh Ganu wrote:
> > > Add support for authenticating uefi capsules. Most of the signature
> > > verification functionality is shared with the uefi secure boot
> > > feature.
> > >
> > > The root certificate containing the public key used for the signature
> > > verification is stored as an efi variable, similar to the variables
> > > used for uefi secure boot. The root certificate is stored as an efi
> > > signature list(esl) file -- this file contains the x509 certificate
> > > which is the root certificate.
> > >
> > > Signed-off-by: Sughosh Ganu
> > > ---
> > > include/efi_api.h | 17 +
> > > include/efi_loader.h | 8 ++-
> > > lib/efi_loader/Kconfig | 16 +
> > > lib/efi_loader/efi_capsule.c | 126 +
> > > lib/efi_loader/efi_signature.c | 4 +-
> > > 5 files changed, 167 insertions(+), 4 deletions(-)
> > >
> >
>
>
>
> > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > > index ec2976ceba..245deabbed 100644
> > > --- a/lib/efi_loader/Kconfig
> > > +++ b/lib/efi_loader/Kconfig
> > > @@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
> > > help
> > > Define storage device, say 1:1, for storing FIT image
> > >
> > > +config EFI_CAPSULE_AUTHENTICATE
> > > + bool "Update Capsule authentication"
> > > + depends on EFI_HAVE_CAPSULE_SUPPORT
> > > + depends on EFI_CAPSULE_ON_DISK
> > > + depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
> >
> > Do we need those two configurations?
> >
>
> Right, I think we can just do with the EFI_CAPSULE_ON_DISK. Will change.
Actually I don't think we need EFI_CAPSULE_ON_DISK neither.
>
> >
> > > + select SHA256
> > > + select RSA
> > > + select RSA_VERIFY
> > > + select RSA_VERIFY_WITH_PKEY
> > > + select X509_CERTIFICATE_PARSER
> > > + select PKCS7_MESSAGE_PARSER
> > > + default n
> > > + help
> > > + Select this option if you want to enable capsule
> > > + authentication
> > > +
> > > config EFI_DEVICE_PATH_TO_TEXT
> > > bool "Device path to text protocol"
> > > default y
> > > diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> > > index 931d363edc..a265d36ff0 100644
> > > --- a/lib/efi_loader/efi_capsule.c
> > > +++ b/lib/efi_loader/efi_capsule.c
> > > @@ -12,6 +12,10 @@
> > > #include
> > > #include
> > > #include
> > > +#include "../lib/crypto/pkcs7_parser.h"
> > > +
> >
> > As you might notice, the location was changed by
> > my recent patch.
> >
>
> Will check and update.
>
>
> >
> > > +#include
> > > +#include
> > >
> > > const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
> > > static const efi_guid_t efi_guid_firmware_management_capsule_id =
> > > @@ -245,6 +249,128 @@ out:
> > >
> > > return ret;
> > > }
> > > +
> > > +#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> > > +
> > > +const efi_guid_t efi_guid_capsule_root_cert_guid =
> > > + EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> > > +
> > > +__weak u16 *efi_get_truststore_name(void)
> > > +{
> > > + return L"CRT";
> >
> > This variable is not defined by UEFI specification, isn't it?
> > How can this variable be protected?
> >
>
> This is not part of the uefi specification. The uefi specification does not
> mandate any particular method for storing the root certificate to be used
> for capsule authentication. The edk2 code gets the root certificate through
> a pcd. I had tried using KEK variable for storing the root certificate, and
> had also come up with an implementation. However, the addition/deletion and
> update of the secure variables is very closely tied with the secure boot
> feature and the secure boot state of the system, which is the reason why i
> dropped that solution and used a separate variable, which can be defined by
> the vendor to store the root certificate.
My concern is that, without any protection, the value of this variable
can be modified by a mal-user.
(One simple solution would be to set this variable read-only.)
>
> >
> > > +}
> > > +
> > > +__weak const efi_guid_t *efi_get_truststore_vendor(void)
> > > +{
> > > +
> > > + return &efi_guid_capsule_root_cert_guid;
> > > +}
> > > +
> > > +/**
> > > + * efi_capsule_authenticate() - Authenticate a uefi capsule
> > > + *
> > > + * @capsule: Capsule file with the authentication
> > > + * header
> > > + * @capsule_size:Size of the entire capsule
> > > + * @image: pointer to the image payload minus the
> > > + * authentication header
> > > + * @image_size: size of the image payload
> > > + *
> > > + * Authenticate the capsule signature with the public key contained
> > > + * in the root certificate stored as an efi environment variable
> >
Re: [PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
On Thu, 7 May 2020 at 13:49, Akashi Takahiro
wrote:
> Sughosh,
>
> On Thu, Apr 30, 2020 at 11:06:28PM +0530, Sughosh Ganu wrote:
> > Add support for authenticating uefi capsules. Most of the signature
> > verification functionality is shared with the uefi secure boot
> > feature.
> >
> > The root certificate containing the public key used for the signature
> > verification is stored as an efi variable, similar to the variables
> > used for uefi secure boot. The root certificate is stored as an efi
> > signature list(esl) file -- this file contains the x509 certificate
> > which is the root certificate.
> >
> > Signed-off-by: Sughosh Ganu
> > ---
> > include/efi_api.h | 17 +
> > include/efi_loader.h | 8 ++-
> > lib/efi_loader/Kconfig | 16 +
> > lib/efi_loader/efi_capsule.c | 126 +
> > lib/efi_loader/efi_signature.c | 4 +-
> > 5 files changed, 167 insertions(+), 4 deletions(-)
> >
>
> diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > index ec2976ceba..245deabbed 100644
> > --- a/lib/efi_loader/Kconfig
> > +++ b/lib/efi_loader/Kconfig
> > @@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
> > help
> > Define storage device, say 1:1, for storing FIT image
> >
> > +config EFI_CAPSULE_AUTHENTICATE
> > + bool "Update Capsule authentication"
> > + depends on EFI_HAVE_CAPSULE_SUPPORT
> > + depends on EFI_CAPSULE_ON_DISK
> > + depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
>
> Do we need those two configurations?
>
Right, I think we can just do with the EFI_CAPSULE_ON_DISK. Will change.
>
> > + select SHA256
> > + select RSA
> > + select RSA_VERIFY
> > + select RSA_VERIFY_WITH_PKEY
> > + select X509_CERTIFICATE_PARSER
> > + select PKCS7_MESSAGE_PARSER
> > + default n
> > + help
> > + Select this option if you want to enable capsule
> > + authentication
> > +
> > config EFI_DEVICE_PATH_TO_TEXT
> > bool "Device path to text protocol"
> > default y
> > diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> > index 931d363edc..a265d36ff0 100644
> > --- a/lib/efi_loader/efi_capsule.c
> > +++ b/lib/efi_loader/efi_capsule.c
> > @@ -12,6 +12,10 @@
> > #include
> > #include
> > #include
> > +#include "../lib/crypto/pkcs7_parser.h"
> > +
>
> As you might notice, the location was changed by
> my recent patch.
>
Will check and update.
>
> > +#include
> > +#include
> >
> > const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
> > static const efi_guid_t efi_guid_firmware_management_capsule_id =
> > @@ -245,6 +249,128 @@ out:
> >
> > return ret;
> > }
> > +
> > +#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> > +
> > +const efi_guid_t efi_guid_capsule_root_cert_guid =
> > + EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> > +
> > +__weak u16 *efi_get_truststore_name(void)
> > +{
> > + return L"CRT";
>
> This variable is not defined by UEFI specification, isn't it?
> How can this variable be protected?
>
This is not part of the uefi specification. The uefi specification does not
mandate any particular method for storing the root certificate to be used
for capsule authentication. The edk2 code gets the root certificate through
a pcd. I had tried using KEK variable for storing the root certificate, and
had also come up with an implementation. However, the addition/deletion and
update of the secure variables is very closely tied with the secure boot
feature and the secure boot state of the system, which is the reason why i
dropped that solution and used a separate variable, which can be defined by
the vendor to store the root certificate.
>
> > +}
> > +
> > +__weak const efi_guid_t *efi_get_truststore_vendor(void)
> > +{
> > +
> > + return &efi_guid_capsule_root_cert_guid;
> > +}
> > +
> > +/**
> > + * efi_capsule_authenticate() - Authenticate a uefi capsule
> > + *
> > + * @capsule: Capsule file with the authentication
> > + * header
> > + * @capsule_size:Size of the entire capsule
> > + * @image: pointer to the image payload minus the
> > + * authentication header
> > + * @image_size: size of the image payload
> > + *
> > + * Authenticate the capsule signature with the public key contained
> > + * in the root certificate stored as an efi environment variable
> > + *
> > + * Return: EFI_SUCCESS on successfull authentication or
> > + * EFI_SECURITY_VIOLATION on authentication failure
> > + */
> > +efi_status_t efi_capsule_authenticate(const void *capsule,
> > + efi_uintn_t capsule_size,
> > + void **image, efi_uintn_t
> *image_size)
> > +{
> > + uint64_t monotonic_count;
> > + struct efi_signature_store *truststore;
> > + struct pkcs7_message *capsule_sig;
> > + struct efi_image_regions *regs;
> > + struct efi_firmware_ima
Re: [PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
Sughosh,
On Thu, Apr 30, 2020 at 11:06:28PM +0530, Sughosh Ganu wrote:
> Add support for authenticating uefi capsules. Most of the signature
> verification functionality is shared with the uefi secure boot
> feature.
>
> The root certificate containing the public key used for the signature
> verification is stored as an efi variable, similar to the variables
> used for uefi secure boot. The root certificate is stored as an efi
> signature list(esl) file -- this file contains the x509 certificate
> which is the root certificate.
>
> Signed-off-by: Sughosh Ganu
> ---
> include/efi_api.h | 17 +
> include/efi_loader.h | 8 ++-
> lib/efi_loader/Kconfig | 16 +
> lib/efi_loader/efi_capsule.c | 126 +
> lib/efi_loader/efi_signature.c | 4 +-
> 5 files changed, 167 insertions(+), 4 deletions(-)
>
> diff --git a/include/efi_api.h b/include/efi_api.h
> index e518ffa838..8dfa479db4 100644
> --- a/include/efi_api.h
> +++ b/include/efi_api.h
> @@ -1794,6 +1794,23 @@ struct efi_variable_authentication_2 {
> struct win_certificate_uefi_guid auth_info;
> } __attribute__((__packed__));
>
> +/**
> + * efi_firmware_image_authentication - Capsule authentication method
> + * descriptor
> + *
> + * This structure describes an authentication information for
> + * a capsule with IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED set
> + * and should be included as part of the capsule.
> + * Only EFI_CERT_TYPE_PKCS7_GUID is accepted.
> + *
> + * @monotonic_count: Count to prevent replay
> + * @auth_info: Authentication info
> + */
> +struct efi_firmware_image_authentication {
> + uint64_t monotonic_count;
> + struct win_certificate_uefi_guid auth_info;
> +} __attribute__((__packed__));
> +
> /**
> * efi_signature_data - A format of signature
> *
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index 8d923451ce..897710ae3f 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -708,7 +708,7 @@ void efi_deserialize_load_option(struct efi_load_option
> *lo, u8 *data);
> unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8
> **data);
> efi_status_t efi_bootmgr_load(efi_handle_t *handle);
>
> -#ifdef CONFIG_EFI_SECURE_BOOT
> +#if defined(CONFIG_EFI_SECURE_BOOT) ||
> defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> #include
>
> /**
> @@ -783,7 +783,7 @@ bool efi_image_parse(void *efi, size_t len, struct
> efi_image_regions **regp,
>WIN_CERTIFICATE **auth, size_t *auth_len);
> struct pkcs7_message *efi_parse_pkcs7_header(const void *buf, size_t buflen);
>
> -#endif /* CONFIG_EFI_SECURE_BOOT */
> +#endif /* CONFIG_EFI_SECURE_BOOT || CONFIG_EFI_CAPSULE_AUTHENTICATE */
>
> #ifdef CONFIG_EFI_HAVE_CAPSULE_SUPPORT
> /* Capsule update */
> @@ -798,6 +798,10 @@ efi_status_t EFIAPI efi_query_capsule_caps(
> u32 *reset_type);
> #endif /* CONFIG_EFI_HAVE_CAPSULE_SUPPORT */
>
> +efi_status_t efi_capsule_authenticate(const void *capsule,
> + efi_uintn_t capsule_size,
> + void **image, efi_uintn_t *image_size);
> +
> #ifdef CONFIG_EFI_CAPSULE_ON_DISK
> #define EFI_CAPSULE_DIR L"\\EFI\\UpdateCapsule\\"
>
> diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> index ec2976ceba..245deabbed 100644
> --- a/lib/efi_loader/Kconfig
> +++ b/lib/efi_loader/Kconfig
> @@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
> help
> Define storage device, say 1:1, for storing FIT image
>
> +config EFI_CAPSULE_AUTHENTICATE
> + bool "Update Capsule authentication"
> + depends on EFI_HAVE_CAPSULE_SUPPORT
> + depends on EFI_CAPSULE_ON_DISK
> + depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
Do we need those two configurations?
> + select SHA256
> + select RSA
> + select RSA_VERIFY
> + select RSA_VERIFY_WITH_PKEY
> + select X509_CERTIFICATE_PARSER
> + select PKCS7_MESSAGE_PARSER
> + default n
> + help
> + Select this option if you want to enable capsule
> + authentication
> +
> config EFI_DEVICE_PATH_TO_TEXT
> bool "Device path to text protocol"
> default y
> diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> index 931d363edc..a265d36ff0 100644
> --- a/lib/efi_loader/efi_capsule.c
> +++ b/lib/efi_loader/efi_capsule.c
> @@ -12,6 +12,10 @@
> #include
> #include
> #include
> +#include "../lib/crypto/pkcs7_parser.h"
> +
As you might notice, the location was changed by
my recent patch.
> +#include
> +#include
>
> const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
> static const efi_guid_t efi_guid_firmware_management_capsule_id =
> @@ -245,6 +249,128 @@ out:
>
> return ret;
> }
> +
> +#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
> +
> +const efi_guid_t efi_guid_capsule_root_cert_guid =
> + EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
> +
> +__weak u16 *efi
[PATCH 6/8] efi: capsule: Add support for uefi capsule authentication
Add support for authenticating uefi capsules. Most of the signature
verification functionality is shared with the uefi secure boot
feature.
The root certificate containing the public key used for the signature
verification is stored as an efi variable, similar to the variables
used for uefi secure boot. The root certificate is stored as an efi
signature list(esl) file -- this file contains the x509 certificate
which is the root certificate.
Signed-off-by: Sughosh Ganu
---
include/efi_api.h | 17 +
include/efi_loader.h | 8 ++-
lib/efi_loader/Kconfig | 16 +
lib/efi_loader/efi_capsule.c | 126 +
lib/efi_loader/efi_signature.c | 4 +-
5 files changed, 167 insertions(+), 4 deletions(-)
diff --git a/include/efi_api.h b/include/efi_api.h
index e518ffa838..8dfa479db4 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -1794,6 +1794,23 @@ struct efi_variable_authentication_2 {
struct win_certificate_uefi_guid auth_info;
} __attribute__((__packed__));
+/**
+ * efi_firmware_image_authentication - Capsule authentication method
+ * descriptor
+ *
+ * This structure describes an authentication information for
+ * a capsule with IMAGE_ATTRIBUTE_AUTHENTICATION_REQUIRED set
+ * and should be included as part of the capsule.
+ * Only EFI_CERT_TYPE_PKCS7_GUID is accepted.
+ *
+ * @monotonic_count: Count to prevent replay
+ * @auth_info: Authentication info
+ */
+struct efi_firmware_image_authentication {
+ uint64_t monotonic_count;
+ struct win_certificate_uefi_guid auth_info;
+} __attribute__((__packed__));
+
/**
* efi_signature_data - A format of signature
*
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 8d923451ce..897710ae3f 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -708,7 +708,7 @@ void efi_deserialize_load_option(struct efi_load_option
*lo, u8 *data);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
efi_status_t efi_bootmgr_load(efi_handle_t *handle);
-#ifdef CONFIG_EFI_SECURE_BOOT
+#if defined(CONFIG_EFI_SECURE_BOOT) || defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
#include
/**
@@ -783,7 +783,7 @@ bool efi_image_parse(void *efi, size_t len, struct
efi_image_regions **regp,
WIN_CERTIFICATE **auth, size_t *auth_len);
struct pkcs7_message *efi_parse_pkcs7_header(const void *buf, size_t buflen);
-#endif /* CONFIG_EFI_SECURE_BOOT */
+#endif /* CONFIG_EFI_SECURE_BOOT || CONFIG_EFI_CAPSULE_AUTHENTICATE */
#ifdef CONFIG_EFI_HAVE_CAPSULE_SUPPORT
/* Capsule update */
@@ -798,6 +798,10 @@ efi_status_t EFIAPI efi_query_capsule_caps(
u32 *reset_type);
#endif /* CONFIG_EFI_HAVE_CAPSULE_SUPPORT */
+efi_status_t efi_capsule_authenticate(const void *capsule,
+ efi_uintn_t capsule_size,
+ void **image, efi_uintn_t *image_size);
+
#ifdef CONFIG_EFI_CAPSULE_ON_DISK
#define EFI_CAPSULE_DIR L"\\EFI\\UpdateCapsule\\"
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index ec2976ceba..245deabbed 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -110,6 +110,22 @@ config EFI_CAPSULE_FIT_DEVICE
help
Define storage device, say 1:1, for storing FIT image
+config EFI_CAPSULE_AUTHENTICATE
+ bool "Update Capsule authentication"
+ depends on EFI_HAVE_CAPSULE_SUPPORT
+ depends on EFI_CAPSULE_ON_DISK
+ depends on EFI_FIRMWARE_MANAGEMENT_PROTOCOL
+ select SHA256
+ select RSA
+ select RSA_VERIFY
+ select RSA_VERIFY_WITH_PKEY
+ select X509_CERTIFICATE_PARSER
+ select PKCS7_MESSAGE_PARSER
+ default n
+ help
+ Select this option if you want to enable capsule
+ authentication
+
config EFI_DEVICE_PATH_TO_TEXT
bool "Device path to text protocol"
default y
diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index 931d363edc..a265d36ff0 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -12,6 +12,10 @@
#include
#include
#include
+#include "../lib/crypto/pkcs7_parser.h"
+
+#include
+#include
const efi_guid_t efi_guid_capsule_report = EFI_CAPSULE_REPORT_GUID;
static const efi_guid_t efi_guid_firmware_management_capsule_id =
@@ -245,6 +249,128 @@ out:
return ret;
}
+
+#if defined(CONFIG_EFI_CAPSULE_AUTHENTICATE)
+
+const efi_guid_t efi_guid_capsule_root_cert_guid =
+ EFI_FIRMWARE_MANAGEMENT_CAPSULE_ID_GUID;
+
+__weak u16 *efi_get_truststore_name(void)
+{
+ return L"CRT";
+}
+
+__weak const efi_guid_t *efi_get_truststore_vendor(void)
+{
+
+ return &efi_guid_capsule_root_cert_guid;
+}
+
+/**
+ * efi_capsule_authenticate() - Authenticate a uefi capsule
+ *
+ * @capsule: Capsule file with the authentication
+ * header
+ * @capsule_size: Size of the entire capsule
+ * @image:
