128 lines
3.4 KiB
Go
128 lines
3.4 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/signature"
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"golang.org/x/sync/errgroup"
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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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return verifyServiceRequestRecursive(body, meta, verificationHeader)
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}
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func verifyServiceRequestRecursive(body stableMarshaler, meta *session.RequestMetaHeader, verify *session.RequestVerificationHeader) 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)
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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)
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}
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func verifyMessageParts(body, meta, originHeader stableMarshaler, hasOriginHeader bool, sigProvider signatureProvider) (stop bool, err error) {
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eg := &errgroup.Group{}
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eg.Go(func() error {
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if err := verifyServiceMessagePart(meta, sigProvider.GetMetaSignature); err != nil {
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return fmt.Errorf("could not verify meta header: %w", err)
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}
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return nil
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})
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eg.Go(func() error {
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if err := verifyServiceMessagePart(originHeader, sigProvider.GetOriginSignature); err != nil {
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return fmt.Errorf("could not verify origin of verification header: %w", err)
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}
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return nil
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})
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if !hasOriginHeader {
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eg.Go(func() error {
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if err := verifyServiceMessagePart(body, sigProvider.GetBodySignature); err != nil {
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return fmt.Errorf("could not verify body: %w", err)
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}
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return nil
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})
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}
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if err := eg.Wait(); err != nil {
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return false, err
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}
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if !hasOriginHeader {
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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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return verifyServiceResponseRecursive(body, meta, verificationHeader)
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}
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func verifyServiceResponseRecursive(body stableMarshaler, meta *session.ResponseMetaHeader, verify *session.ResponseVerificationHeader) 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)
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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)
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}
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func verifyServiceMessagePart(part stableMarshaler, sigRdr func() *refs.Signature) error {
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wrapper := StableMarshalerWrapper{
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SM: part,
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}
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return signature.VerifyDataWithSource(
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wrapper,
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sigRdr,
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)
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}
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