Extending secure guest metadata to bind the secure guest to a hardware security module
View Patent ↗A method, system, and computer program product implement a three-factor authorization in a trusted computing environment. The method includes triggering, by a hypervisor, a start of a secure guest by passing control regarding an image of the secure guest and metadata of the secure guest to a trusted firmware, where the secure guest is designed to access a hardware security module (HSM). Upon a successful integrity check of the metadata of the secure guest by the trusted firmware, the secure guest is started using the hypervisor and any sensitive request from the secure guest to the HSM is blocked. The secure guest submits a request with a request structure including a third authorization secret and a characterization of a requested HSM to the trusted firmware. The method also includes binding each HSM protected key generated in the requested HSM in response to the request to the third authorization secret.
1. A computer-implemented method for implementing a three-factor authorization in a trusted computing environment, the method comprising:
triggering, by a hypervisor, a start of a secure guest by passing control regarding an image of the secure guest and metadata of the secure guest to a trusted firmware, wherein the secure guest is designed to access a hardware security module;
upon a successful integrity check of the metadata of the secure guest by the trusted firmware:
starting the secure guest using the hypervisor; and
blocking any sensitive request from the secure guest to the hardware security module;
submitting, by the secure guest, a request comprising a request structure including a third authorization secret and a characterization of a requested hardware security module to the trusted firmware; and
binding, by the trusted firmware, each hardware security module protected key generated in the requested hardware security module in response to the request to the third authorization secret.
2. The computer-implemented method according to claim 1 , further comprising:
unblocking sensitive requests to the requested hardware security module from the secure guest that only operates on at least one of the each hardware security module protected key bound to the third authorization secret.
3. The computer-implemented method according to claim 1 , further comprising:
instructing, by the trusted firmware, the hardware security module to bind each key to be generated to the third authorization secret.
4. The computer-implemented method according to claim 1 , wherein the request structure is integrity protected and partially encrypted such that only the trusted firmware is enabled to decrypt the encrypted part of the request structure and integrity-check the request.
5. The computer-implemented method according to claim 4 , where the encrypted part of the request structure comprises the third authorization secret.
6. The computer-implemented method according to claim 1 , wherein the metadata of the secure guest comprises an extension secret, and the trusted firmware rejects every request that does not contain the extension secret.
7. The computer-implemented method according to claim 1 , wherein the secure guest submits the request to the trusted firmware via a direct firmware call, wherein the request structure and all sensitive cryptography requests target the hardware security module.
8. The computer-implemented method according to claim 1 , wherein each request to the hardware security module that comprises a hardware security module protected key is a sensitive request.
9. The computer-implemented method according to claim 1 , wherein each request that returns a result containing a hardware security module protected key is a sensitive request.
10. The computer-implemented method according to claim 1 wherein the metadata comprises integrity measures of the image.
11. The computer-implemented method according to claim 1 , wherein the metadata comprises security measures.
12. The computer-implemented method according to claim 1 , further comprising:
protecting, by the trusted firmware, the third authorization secret against access from any guest and the hypervisor.
13. The computer-implemented method according to claim 1 , further comprising, upon providing access to the hardware security module to an untrusted component:
instructing, by the trusted firmware, the hardware security module to no longer accept keys bound to the third authorization secret.
14. A system for implementing a three-factor authorization in a trusted computing environment, the system comprising:
one or more processors; and
a memory operationally coupled to the one or more processors, wherein the memory stores program portions which, when executed, enable the one or more processors to perform a method comprising:
triggering, by a hypervisor, a start of a secure guest by passing control regarding an image of the secure guest and metadata of the secure guest to a trusted firmware, wherein the secure guest is designed to access a hardware security module;
upon a successful integrity check of the metadata of the secure guest by the trusted firmware:
starting the secure guest using the hypervisor, and
blocking any sensitive request from the secure guest to the hardware security module;
submitting, by the secure guest, a request comprising a request structure including a third authorization secret and a characterization of a requested hardware security module to the trusted firmware; and
binding, by the trusted firmware, each hardware security module protected key generated in the requested hardware security module in response to the request to the third authorization secret.
15. The system of claim 14 , wherein the method further comprises:
unblocking sensitive requests to the requested hardware security module from the secure guest that only operates on at least one of the each hardware security module protected key bound to the third authorization secret.
16. The system of claim 14 , wherein the method further comprises:
instructing, by the trusted firmware, the hardware security module to bind each key to be generated to the third authorization secret.
17. The system of claim 14 , wherein the request structure is integrity protected and partially encrypted such that only the trusted firmware is enabled to decrypt the encrypted part of the request structure and integrity-check the request.
18. The system of claim 17 , where the encrypted part of the request structure comprises the third authorization secret.
19. The system of claim 14 , wherein the metadata of the secure guest comprises an extension secret.
20. The system of claim 14 , wherein the secure guest submits the request to the trusted firmware via a direct firmware call, wherein the request structure and all sensitive cryptography requests target to the hardware security module.
21. The system of claim 14 , wherein each request to the hardware security module that comprises a hardware security module protected key is sensitive.
22. The system of claim 14 , wherein each request that returns a result containing a hardware security system protected key is a sensitive request.
23. The system of claim 14 , wherein the metadata comprises integrity measures of the image.
24. The system of claim 14 , wherein the method further comprises protecting, by the trusted firmware, the third authorization secret against access from any guest and the hypervisor.
25. A computer program product, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause a device to perform a method of implementing a three-factor authorization in a trusted computing environment, the method comprising:
triggering, by a hypervisor, a start of a secure guest by passing control regarding an image of the secure guest and metadata of the secure guest to a trusted firmware, wherein the secure guest is designed to access a hardware security module;
upon a successful integrity check of the metadata of the secure guest by the trusted firmware:
starting the secure guest using the hypervisor, and
blocking any sensitive request from the secure guest to the hardware security module;
submitting, by the secure guest, a request comprising a request structure including a third authorization secret and a characterization of a requested hardware security module to the trusted firmware; and
binding, by the trusted firmware, each hardware security module protected key generated in the requested hardware security module in response to the request to the third authorization secret.