/
reproduced_pcrs.go
163 lines (143 loc) · 4.04 KB
/
reproduced_pcrs.go
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package models
import (
"crypto/sha512"
"encoding/json"
"fmt"
"sort"
"time"
"github.com/immune-gmbh/attestation-sdk/pkg/types"
"github.com/9elements/converged-security-suite/v2/pkg/registers"
"github.com/9elements/converged-security-suite/v2/pkg/tpmdetection"
)
// ReproducedPCRs represents a single row `reproduced_pcrs` table
type ReproducedPCRs struct {
ID uint64 `db:"id,pk"`
HashStable types.HashValue `db:"hash_stable"`
Registers string `db:"registers"`
RegistersSHA512 types.HashValue `db:"registers_sha512"`
TPMDevice string `db:"tpm_device"`
PCR0SHA1 []byte `db:"pcr0_sha1"`
PCR0SHA256 []byte `db:"pcr0_sha256"`
Timestamp time.Time `db:"timestamp"`
}
// ParseResgisters returns unmarshalled registers
func (r ReproducedPCRs) ParseResgisters() (registers.Registers, error) {
if len(r.Registers) == 0 {
return nil, nil
}
var regs registers.Registers
if err := json.Unmarshal([]byte(r.Registers), ®s); err != nil {
return nil, err
}
return regs, nil
}
// ParseTPMDevice returns detected TPM device
func (r ReproducedPCRs) ParseTPMDevice() (tpmdetection.Type, error) {
return fromTPMType(tpmType(r.TPMDevice))
}
// NewReproducedPCRs creates a new ReproducedPCRs object
func NewReproducedPCRs(
hashStable types.HashValue,
regs registers.Registers,
tpmDevice tpmdetection.Type,
pcr0SHA1 []byte,
pcr0SHA256 []byte,
) (ReproducedPCRs, error) {
tpm, err := toTPMType(tpmDevice)
if err != nil {
return ReproducedPCRs{}, err
}
sort.Slice(regs, func(i, j int) bool {
return regs[i].ID() < regs[j].ID()
})
regsMarshalled, err := json.Marshal(regs)
if err != nil {
return ReproducedPCRs{}, fmt.Errorf("failed to marshal registers to json: '%w'", err)
}
registersSHA512, err := getRegistersKey(regs)
if err != nil {
return ReproducedPCRs{}, err
}
return ReproducedPCRs{
HashStable: hashStable,
Registers: string(regsMarshalled),
RegistersSHA512: registersSHA512,
TPMDevice: string(tpm),
PCR0SHA1: pcr0SHA1,
PCR0SHA256: pcr0SHA256,
}, nil
}
// UniqueKey represents a unique search index for reproduced_pcrs table
type UniqueKey struct {
HashStable types.HashValue
RegistersSHA512 types.HashValue
TPMDevice string
}
// NewUniqueKey create a new UniqueKey object
func NewUniqueKey(
hashStable types.HashValue,
regs registers.Registers,
tpmDevice tpmdetection.Type,
) (UniqueKey, error) {
tpm, err := toTPMType(tpmDevice)
if err != nil {
return UniqueKey{}, err
}
sort.Slice(regs, func(i, j int) bool {
return regs[i].ID() < regs[j].ID()
})
registersSHA512, err := getRegistersKey(regs)
if err != nil {
return UniqueKey{}, err
}
return UniqueKey{
HashStable: hashStable,
RegistersSHA512: registersSHA512,
TPMDevice: string(tpm),
}, nil
}
func getRegistersKey(regs registers.Registers) (types.HashValue, error) {
if !sort.SliceIsSorted(regs, func(i, j int) bool {
return regs[i].ID() < regs[j].ID()
}) {
panic("registers are not sorted")
}
h := sha512.New()
for _, reg := range regs {
h.Write([]byte(reg.ID()))
b, err := registers.ValueBytes(reg)
if err != nil {
return nil, fmt.Errorf("failed to marshal register: '%s', err: '%w'", reg.ID(), err)
}
h.Write(b)
}
return types.HashValue(h.Sum(nil)), nil
}
type tpmType string
const (
unknownTPMType tpmType = "unknown"
tpm12Type tpmType = "1.2"
tpm20Type tpmType = "2.0"
)
func toTPMType(in tpmdetection.Type) (tpmType, error) {
switch in {
case tpmdetection.TypeNoTPM:
return unknownTPMType, nil
case tpmdetection.TypeTPM12:
return tpm12Type, nil
case tpmdetection.TypeTPM20:
return tpm20Type, nil
}
return unknownTPMType, fmt.Errorf("unknown TPM type: '%v'", in)
}
func fromTPMType(in tpmType) (tpmdetection.Type, error) {
switch in {
case unknownTPMType:
return tpmdetection.TypeNoTPM, nil
case tpm12Type:
return tpmdetection.TypeTPM12, nil
case tpm20Type:
return tpmdetection.TypeTPM20, nil
}
return tpmdetection.TypeNoTPM, fmt.Errorf("unknown TPM type: '%v'", in)
}