112 lines
3.5 KiB
Go
112 lines
3.5 KiB
Go
package signature
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import (
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"errors"
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"fmt"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/util/collection"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/util/signature"
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)
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type signatureProvider interface {
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GetBodySignature() *refs.Signature
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GetMetaSignature() *refs.Signature
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GetOriginSignature() *refs.Signature
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}
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// VerifyServiceMessage verifies service message.
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func VerifyServiceMessage(msg interface{}) error {
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switch v := msg.(type) {
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case nil:
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return nil
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case serviceRequest:
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return verifyServiceRequest(v)
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case serviceResponse:
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return verifyServiceResponse(v)
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default:
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panic(fmt.Sprintf("unsupported session message %T", v))
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}
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}
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func verifyServiceRequest(v serviceRequest) error {
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meta := v.GetMetaHeader()
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verificationHeader := v.GetVerificationHeader()
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body := serviceMessageBody(v)
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size := collection.Max(body.StableSize(), meta.StableSize(), verificationHeader.StableSize())
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buf := make([]byte, 0, size)
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return verifyServiceRequestRecursive(body, meta, verificationHeader, buf)
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}
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func verifyServiceRequestRecursive(body stableMarshaler, meta *session.RequestMetaHeader, verify *session.RequestVerificationHeader, buf []byte) error {
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verificationHeaderOrigin := verify.GetOrigin()
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metaOrigin := meta.GetOrigin()
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stop, err := verifyMessageParts(body, meta, verificationHeaderOrigin, verificationHeaderOrigin != nil, verify, buf)
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if err != nil {
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return err
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}
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if stop {
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return nil
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}
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return verifyServiceRequestRecursive(body, metaOrigin, verificationHeaderOrigin, buf)
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}
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func verifyMessageParts(body, meta, originHeader stableMarshaler, hasOriginHeader bool, sigProvider signatureProvider, buf []byte) (stop bool, err error) {
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if err := verifyServiceMessagePart(meta, sigProvider.GetMetaSignature, buf); err != nil {
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return false, fmt.Errorf("could not verify meta header: %w", err)
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}
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if err := verifyServiceMessagePart(originHeader, sigProvider.GetOriginSignature, buf); err != nil {
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return false, fmt.Errorf("could not verify origin of verification header: %w", err)
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}
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if !hasOriginHeader {
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if err := verifyServiceMessagePart(body, sigProvider.GetBodySignature, buf); err != nil {
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return false, fmt.Errorf("could not verify body: %w", err)
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}
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return true, nil
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}
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if sigProvider.GetBodySignature() != nil {
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return false, errors.New("body signature misses at the matryoshka upper level")
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}
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return false, nil
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}
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func verifyServiceResponse(v serviceResponse) error {
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meta := v.GetMetaHeader()
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verificationHeader := v.GetVerificationHeader()
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body := serviceMessageBody(v)
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size := collection.Max(body.StableSize(), meta.StableSize(), verificationHeader.StableSize())
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buf := make([]byte, 0, size)
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return verifyServiceResponseRecursive(body, meta, verificationHeader, buf)
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}
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func verifyServiceResponseRecursive(body stableMarshaler, meta *session.ResponseMetaHeader, verify *session.ResponseVerificationHeader, buf []byte) error {
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verificationHeaderOrigin := verify.GetOrigin()
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metaOrigin := meta.GetOrigin()
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stop, err := verifyMessageParts(body, meta, verificationHeaderOrigin, verificationHeaderOrigin != nil, verify, buf)
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if err != nil {
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return err
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}
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if stop {
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return nil
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}
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return verifyServiceResponseRecursive(body, metaOrigin, verificationHeaderOrigin, buf)
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}
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func verifyServiceMessagePart(part stableMarshaler, sigRdr func() *refs.Signature, buf []byte) error {
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return signature.VerifyDataWithSource(
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&StableMarshalerWrapper{part},
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sigRdr,
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signature.WithBuffer(buf),
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)
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}
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