mirror of
https://github.com/owncast/owncast.git
synced 2024-12-18 15:23:55 +03:00
128 lines
3.8 KiB
Go
128 lines
3.8 KiB
Go
package inbox
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import (
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"context"
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"crypto/x509"
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"encoding/pem"
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"net/http"
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"net/url"
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"strings"
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"github.com/pkg/errors"
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"github.com/go-fed/httpsig"
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"github.com/owncast/owncast/activitypub/apmodels"
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"github.com/owncast/owncast/activitypub/persistence"
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"github.com/owncast/owncast/activitypub/resolvers"
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"github.com/owncast/owncast/core/data"
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log "github.com/sirupsen/logrus"
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)
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func handle(request apmodels.InboxRequest) {
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if verified, err := Verify(request.Request); err != nil {
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log.Debugln("Error in attempting to verify request", err)
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return
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} else if !verified {
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log.Debugln("Request failed verification", err)
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return
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}
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if err := resolvers.Resolve(context.Background(), request.Body, handleUpdateRequest, handleFollowInboxRequest, handleLikeRequest, handleAnnounceRequest, handleUndoInboxRequest, handleCreateRequest); err != nil {
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log.Debugln("resolver error:", err)
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}
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}
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// Verify will Verify the http signature of an inbound request as well as
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// check it against the list of blocked domains.
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func Verify(request *http.Request) (bool, error) {
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verifier, err := httpsig.NewVerifier(request)
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if err != nil {
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return false, errors.Wrap(err, "failed to create key verifier for request")
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}
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pubKeyID, err := url.Parse(verifier.KeyId())
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if err != nil {
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return false, errors.Wrap(err, "failed to parse key to get key ID")
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}
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// Force federation only via servers using https.
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if pubKeyID.Scheme != "https" {
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return false, errors.New("federated servers must use https: " + pubKeyID.String())
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}
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signature := request.Header.Get("signature")
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var algorithmString string
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signatureComponents := strings.Split(signature, ",")
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for _, component := range signatureComponents {
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kv := strings.Split(component, "=")
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if kv[0] == "algorithm" {
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algorithmString = kv[1]
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break
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}
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}
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algorithmString = strings.Trim(algorithmString, "\"")
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if algorithmString == "" {
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return false, errors.New("Unable to determine algorithm to verify request")
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}
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actor, err := resolvers.GetResolvedActorFromIRI(pubKeyID.String())
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if err != nil {
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return false, errors.Wrap(err, "failed to resolve actor from IRI to fetch key")
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}
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// Test to see if the actor is in the list of blocked federated domains.
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if isBlockedDomain(actor.ActorIri.Hostname()) {
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return false, errors.New("domain is blocked")
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}
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// If actor is specifically blocked, then fail validation.
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if blocked, err := isBlockedActor(actor.ActorIri); err != nil || blocked {
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return false, err
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}
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key := actor.W3IDSecurityV1PublicKey.Begin().Get().GetW3IDSecurityV1PublicKeyPem().Get()
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block, _ := pem.Decode([]byte(key))
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if block == nil {
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log.Errorln("failed to parse PEM block containing the public key")
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return false, errors.New("failed to parse PEM block containing the public key")
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}
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parsedKey, err := x509.ParsePKIXPublicKey(block.Bytes)
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if err != nil {
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log.Errorln("failed to parse DER encoded public key: " + err.Error())
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return false, errors.Wrap(err, "failed to parse DER encoded public key")
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}
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var algorithm httpsig.Algorithm = httpsig.Algorithm(algorithmString)
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// The verifier will verify the Digest in addition to the HTTP signature
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if err := verifier.Verify(parsedKey, algorithm); err != nil {
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log.Warnln("verification error for", pubKeyID, err)
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return false, errors.Wrap(err, "verification error: "+pubKeyID.String())
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}
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return true, nil
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}
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func isBlockedDomain(domain string) bool {
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blockedDomains := data.GetBlockedFederatedDomains()
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for _, blockedDomain := range blockedDomains {
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if strings.Contains(domain, blockedDomain) {
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return true
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}
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}
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return false
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}
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func isBlockedActor(actorIRI *url.URL) (bool, error) {
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blockedactor, err := persistence.GetFollower(actorIRI.String())
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if blockedactor != nil && blockedactor.DisabledAt != nil {
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return true, errors.Wrap(err, "remote actor is blocked")
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}
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return false, nil
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}
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