Abstract: Systems and methods in accordance with various embodiments of the present disclosure provide secure filtering of transactions at a hardware and protocol level using a security device included on a server. In particular, various embodiments provide approaches for filtering transactions on various buses, such as SMBus, PMBus, I2C, and SPI, within a server. This filtering logic can be utilized to modify requests for access to devices on those busses, certain memory or registers within the devices, and/or limit the quantity of transactions on those busses. Embodiments may provide a policy engine through which the filtering logic applied to a given bus or buses may be modified. When a transaction is received, one or more attributes of the transaction can be compared to one or more policies. If there is a match, the transaction can be modified according to the matched policy.

Abstract: Disclosed herein are techniques for maintaining a secure execution environment on a server. In one embodiment, the server includes a bus manager circuit. The bus manager circuit comprises a first bus interface configured to be coupled with a first hardware device of the server, and a second bus interface configured to be coupled with a second hardware device of the sever. The bus manager further includes a control module. Under a first mode of operation, the control module is configured to receive an access request from the first hardware device to access the second hardware device, and responsive to determining not to grant the access request based on a pre-determined access policy, and block at least some of data bits corresponding to the access request from the second bus interface. The control module may also process the access request in a different manner under other modes of operations.

Abstract: Disclosed herein are techniques for maintaining a secure execution environment on a server. In one embodiment, the server includes a bus manager circuit. The bus manager circuit comprises a first bus interface configured to be coupled with a first hardware device of the server, and a second bus interface configured to be coupled with a second hardware device of the sever. The bus manager further includes a control module. Under a first mode of operation, the control module is configured to receive an access request from the first hardware device to access the second hardware device, and responsive to determining not to grant the access request based on a pre-determined access policy, and block at least some of data bits corresponding to the access request from the second bus interface. The control module may also process the access request in a different manner under other modes of operations.