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Nitro Secure Module (NSM)[1] device is used in AWS Nitro Enclaves[2] for stripped down TPM functionality like cryptographic attestation. The requests to and responses from NSM device are CBOR[3] encoded. This commit adds support for NSM device in QEMU. Although related to AWS Nitro Enclaves, the virito-nsm device is independent and can be used in other machine types as well. The libcbor[4] library has been used for the CBOR encoding and decoding functionalities. [1] https://lists.oasis-open.org/archives/virtio-comment/202310/msg00387.html [2] https://docs.aws.amazon.com/enclaves/latest/user/nitro-enclave.html [3] http://cbor.io/ [4] https://libcbor.readthedocs.io/en/latest/ Signed-off-by: Dorjoy Chowdhury <dorjoychy111@gmail.com> Reviewed-by: Alexander Graf <graf@amazon.com> Link: https://lore.kernel.org/r/20241008211727.49088-3-dorjoychy111@gmail.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
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* AWS Nitro Secure Module (NSM) device
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*
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* Copyright (c) 2024 Dorjoy Chowdhury <dorjoychy111@gmail.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#ifndef QEMU_VIRTIO_NSM_H
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#define QEMU_VIRTIO_NSM_H
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#include "crypto/hash.h"
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#include "hw/virtio/virtio.h"
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#include "qom/object.h"
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#define NSM_MAX_PCRS 32
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#define TYPE_VIRTIO_NSM "virtio-nsm-device"
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OBJECT_DECLARE_SIMPLE_TYPE(VirtIONSM, VIRTIO_NSM)
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#define VIRTIO_NSM_GET_PARENT_CLASS(obj) \
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OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_NSM)
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struct PCRInfo {
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bool locked;
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uint8_t data[QCRYPTO_HASH_DIGEST_LEN_SHA384];
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};
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struct VirtIONSM {
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VirtIODevice parent_obj;
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/* Only one vq - guest puts request and response buffers on it */
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VirtQueue *vq;
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/* NSM State */
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uint16_t max_pcrs;
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struct PCRInfo pcrs[NSM_MAX_PCRS];
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char *digest;
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char *module_id;
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uint8_t version_major;
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uint8_t version_minor;
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uint8_t version_patch;
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bool (*extend_pcr)(VirtIONSM *vnsm, int ind, uint8_t *data, uint16_t len);
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void (*lock_pcr)(VirtIONSM *vnsm, int ind);
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};
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#endif
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