Update documentation with the UEFI changes
Adding UEFI authenticated variables related information
to the documentation.
Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Change-Id: Ic4fd4b6d73994f8a1ddf0ce4e3a0706589f1fd54
diff --git a/docs/services/image/smm-gateway-layers.svg b/docs/services/image/smm-gateway-layers.svg
index e930e6c..5c3e0d6 100644
--- a/docs/services/image/smm-gateway-layers.svg
+++ b/docs/services/image/smm-gateway-layers.svg
@@ -1,4 +1,4 @@
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width: 118px; height: 1px; padding-top: 60px; margin-left: 381px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Attributes<br />8 byte</div></div></div></foreignObject><text x="440" y="64" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Attributes...</text></switch></g><rect x="500" y="30" width="120" height="60" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 60px; margin-left: 501px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Name<br /><NameSize> byte</div></div></div></foreignObject><text x="560" y="64" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Name...</text></switch></g><rect x="620" y="30" width="120" height="60" fill="#dae8fc" stroke="#6c8ebf" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 60px; margin-left: 621px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Data<br /><DataSize> byte</div></div></div></foreignObject><text x="680" y="64" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Data...</text></switch></g><rect x="250" y="170" width="860" height="100" rx="15" ry="15" fill="#dae8fc" stroke="#6c8ebf" pointer-events="none"/><rect x="250" y="170" width="860" height="100" rx="15" ry="15" fill="#cce5ff" stroke="#36393d" pointer-events="none"/><rect x="260" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 261px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">TimeStamp<br />16 byte</div></div></div></foreignObject><text x="320" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">TimeStamp...</text></switch></g><rect x="380" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 381px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">dwLength<br />8 byte</div></div></div></foreignObject><text x="440" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">dwLength...</text></switch></g><rect x="500" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 501px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">wRevision<br />8 byte</div></div></div></foreignObject><text x="560" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">wRevision...</text></switch></g><rect x="620" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 621px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">wCertificateType<br />8 byte</div></div></div></foreignObject><text x="680" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">wCertificateType...</text></switch></g><rect x="740" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 741px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">CertType<br />16 byte</div></div></div></foreignObject><text x="800" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">CertType...</text></switch></g><rect x="860" y="206.36" width="120" height="54.55" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 234px; margin-left: 981px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Payload</div></div></div></foreignObject><text x="1040" y="237" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Payload</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 138px; height: 1px; padding-top: 184px; margin-left: 971px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">UEFI Variable</div></div></div></foreignObject><text x="1040" y="187" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">UEFI Variable</text></switch></g><rect x="525" y="350" width="1030" height="110" rx="16.5" ry="16.5" fill="#f8cecc" stroke="#b85450" pointer-events="none"/><rect x="545.93" y="390" width="69.07" height="60" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 67px; height: 1px; padding-top: 420px; margin-left: 547px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Sign. Type<br />16 byte</div></div></div></foreignObject><text x="580" y="424" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Sign. Type...</text></switch></g><rect x="615" y="390" width="90" height="60" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 88px; height: 1px; padding-top: 420px; margin-left: 616px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Sign. List Size<br />4 byte</div></div></div></foreignObject><text x="660" y="424" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Sign. List Size...</text></switch></g><rect x="705" y="390" width="100" height="60" fill="#fff2cc" stroke="#d6b656" pointer-events="none"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 420px; margin-left: 706px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">Sign. 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diff --git a/docs/services/uefi-smm-services.rst b/docs/services/uefi-smm-services.rst
index c21ea4c..c2a6079 100644
--- a/docs/services/uefi-smm-services.rst
+++ b/docs/services/uefi-smm-services.rst
@@ -28,8 +28,8 @@
is structured in the same way as other service providers within the TS project. Features of this
component are:
- * Source file location: ``components/service/smm_variable``
- * Public interface definitions: ``protocols/service/smm_variable``
+ * Source file location: ``components/service/uefi/smm_variable``
+ * Public interface definitions: ``protocols/service/uefi/smm_variable``
* Can be used with any RPC layer - not tied to MM Communicate RPC.
* Volatile and non-volatile storage is accessed via instances of the common *storage_backend* interface.
@@ -38,9 +38,11 @@
* An MM Communicate based RPC endpoint.
* A *mock_store* instance for volatile variables.
* A *secure_storage_client* for non-volatile variables.
+ * A *crypto client* for signature verification.
During SP initialization, the *smm-gateway* uses pre-configured information to discover a backend secure
-storage SP for NV storage.
+storage SP for NV storage and a crypto SP to verify signatures needed for UEFI variable authentication.
+Crypto SP is accessible only if UEFI_AUTH_VAR is enabled.
The following diagram illustrates how the *smm_variable* service provider is integrated into the *smm-gateway*.
@@ -115,17 +117,192 @@
- Runtime access controlled by smm_variable service provider.
* - EFI_VARIABLE_HARDWARE_ERROR_RECORD
- no
- -
+ - If the attribute contains this value, VariableName and VendorGuid must comply with the rules
+ stated in Section 8.2.4.2 and Appendix P of the standard.
* - EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
- no
- -
+ - DEPRECATED
+ * - EFI_VARIABLE_ENHANCED_AUTHENTICATED_ACCESS
+ - no
+ - Authentication with EFI_VARIABLE_AUTHENTICATION_3 descriptor is enabled.
* - EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
- - not yet
- - Will be needed for secure boot support
+ - yes
+ - Authentication with EFI_VARIABLE_AUTHENTICATION_2 descriptor is enabled.
* - EFI_VARIABLE_APPEND_WRITE
- yes
- Implemented by overwriting entire variable data.
+Limitations
+'''''''''''
+
+.. list-table::
+ :header-rows: 1
+
+ * - Description
+ - Value
+ * - Maximum size of a single variable
+ - 4096 bytes
+ * - Supported type of signature list element
+ - DER-encoded X.509 certificates
+ * - Supported type of public keys
+ - DER-encoded SignedData structure per PKCS#7 version 1.5, with or without a DER-encoded
+ ContentInfo structure per PKCS#7 version 1.5.
+
+Variable authentication
+'''''''''''''''''''''''
+
+UEFI variable authentication is a method to ensure that a UEFI variable can only be modified
+by those who has proper rights. This restricts only the writing of these variables, while reading
+is only limited by the state of the system (boot versus runtime access).
+
+Key Store Variables
+```````````````````
+Key Store variables store authentication keys, and have predefined special names to specify the
+keys scope (area of effect). When a write access to a variable with an active
+EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute is being made, the signature part of
+the write access will be verified against the appropriate key Store variable.
+Access will only be granted if the signature is valid.
+
+The following table lists which Key Store variables defined by the UEFI standard are implemented.
+
+.. list-table::
+ :header-rows: 1
+
+ * - Variable name
+ - Description
+ - Supported
+ * - Platform Key (PK)
+ - Root of trust. If it is not set the authentication is disabled, all write requests are successful.
+ - yes
+ * - Key Exchange Key Database (KEK)
+ - Protects key store databases from unauthorized modifications.
+ - yes
+ * - Signature Database (db)
+ - If a variable write request is signed by the public key whose private pair is
+ stored here the authentication will pass.
+ - yes
+ * - Blacklist Signature Database (dbx)
+ - Contains signatures of software that must not run on the platform.
+ - no
+ * - Authorized Recovery Signature Database (dbr)
+ - Contains signatures of software that can be run for recovery.
+ - no
+ * - Timestamp Signature Database (dbt)
+ - Same as db, but the timestamp of the certificate is also verified.
+ - no
+
+There is no support for initializing the values of the read-only global variables containing
+default values of the key store variables (e.g. PKDefault, KEKDefault, etc.).
+
+The following diagram shows variable authentication hierarchy.
+
+*A → B means A has the right to verify write request to B*
+
+.. uml::
+
+ @startuml
+ [PK] --> [PK]
+ [PK] --> [KEK]
+ [PK] --> [db]
+ [KEK] --> [db]
+ [db] --> [Common Variable]
+ @enduml
+
+Authenticated Variable Lifecycle
+````````````````````````````````
+
+.. uml::
+
+ @startuml
+
+ start
+ if (Is authentication enabled?)
+ if (Enable authentication?) then (yes)
+ :Key Provision
+ {{
+ hide empty description
+
+ state "Set PK" as keyprovision1
+ state "Set KEK (write request must be signed by PK)" as keyprovision2
+ state "Set db (write request must be signed with PK or KEK)" as keyprovision3
+
+ keyprovision1 --> keyprovision2
+ keyprovision2 --> keyprovision3
+ }}
+ ;
+ endif
+ else (yes)
+ switch (Request)
+ case (Clear store\n(disable authentication))
+ :Clear Store
+ {{
+ hide empty description
+
+ state "Delete PK (write request must be signed with PK)" as delete1
+ state "Delete KEK or db (authentication is disabled, so signature is not verified)" as delete2
+
+ delete1 --> delete2
+ }}
+ ;
+ case (Update keys)
+ :Key Update
+ {{
+ hide empty description
+
+ state "Set PK (write request must be signed by original PK)" as keyupdate1
+ state "Set KEK (write request must be signed by new PK)" as keyupdate2
+ state "Set db (write request must be signed with new PK or new KEK)" as keyupdate3
+
+ keyupdate1 --> keyupdate2
+ keyupdate2 --> keyupdate3
+ }}
+ ;
+ case (Reset factory keys)
+
+ skinparam partitionBorderColor red
+ partition "**NOT IMPLEMENTED**" {
+ switch (Recovery method)
+ case ()
+ :Using Setup Mode
+ {{
+ hide empty description
+
+ state "Enter Setup Mode to disable authentication" as recovery1
+ state "Delete PK, KEK, db (signatures are not verified in this mode)" as recovery2
+ state "Leave setup mode, but authentication is still disabled, because PK is empty" as recovery3
+
+ recovery1 -->recovery2
+ recovery2 -->recovery3
+ }}
+ ;
+ case ()
+ :Using default keystores (PKdefault, KEKDefault, dbDefault);
+
+ endswitch
+ }
+
+ case(None)
+ endswitch
+ endif
+
+ end
+
+ @enduml
+
+Variable structure
+``````````````````
+
+.. image:: image/uefi-variable-structure.svg
+
+|
+
+* The elements of the signature verification are stored in or calculated from the fields of the variables:
+ #. Hash: Calculated on Name, GUID, Attributes, Timestamp, Payload fields of the write request
+ #. Public Key: Extracted from the 'Sign. Data' element of the Signature List field in the Payload
+ of the variable responsible for authenticating the request
+ (e.g. in case of KEK request, it will be extracted from PK)
+ #. Signature: Extracted from the 'CertData' field of the write request.
+
SMM Variable Tests
''''''''''''''''''
The following test components exist for the SMM Variable service:
@@ -136,16 +313,16 @@
* - Test Component
- Description
- Included in deployments
- * - ``component/service/smm_variable/backend/test``
+ * - ``component/service/uefi/smm_variable/backend/test``
- | Component tests for the variable_index and variable_store backend
| components. Can be run in a native PC environment.
- ``deployments/component-test/*``
- * - ``component/service/smm_variable/test/service``
+ * - ``component/service/uefi/smm_variable/test/service``
- | End-to-end service level tests that call service operations from
| the perspective of a client. Can be run in a native PC environment
| or on the Arm target platform.
- - | ``deployments/ts-service-test/linux-pc``
- | ``deployments/uefi-test/arm-linux``
+ - | ``deployments/ts-service-test/*``
+ | ``deployments/uefi-test/*``
SMM Gateway Build Configuration
-------------------------------
@@ -164,12 +341,24 @@
- Default value
* - SMM_GATEWAY_MAX_UEFI_VARIABLES
- Maximum number of variables
- - ``deployments/smm-gateway/smm_gateway.c``
+ - ``deployments/smm-gateway/common/smm_gateway.c``
- 40
+ * - UEFI_MAX_VARIABLE_SIZE
+ - Maximum size of the uefi variables in bytes
+ - ``components/service/uefi/smm_variable/backend/uefi_variable_store.c``
+ - 4096
* - SMM_GATEWAY_NV_STORE_SN
- The service ID for the backend NV variable store
- - ``deployments/smm-gateway/smm_gateway.c``
+ - ``deployments/smm-gateway/common/smm_gateway.c``
- Protected Storage SP
+ * - SMM_GATEWAY_CRYPTO_SN
+ - The service ID for the crypto backend
+ - ``deployments/smm-gateway/common/smm_gateway.c``
+ - Crypto SP
+ * - UEFI_AUTH_VAR
+ - Enables or disables UEFI variable authentication
+ - ``components/service/uefi/smm_variable/backend/uefi_variable_store.c``
+ - OFF
MM Communicate RPC Layer
------------------------
