51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
package security
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import (
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"net/http"
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"net/url"
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"github.com/gin-gonic/gin"
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"github.com/go-fed/httpsig"
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"github.com/superseriousbusiness/gotosocial/internal/util"
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)
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// SignatureCheck checks whether an incoming http request has been signed. If so, it will check if the domain
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// that signed the request is permitted to access the server. If it is permitted, the handler will set the key
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// verifier in the gin context for use down the line.
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func (m *Module) SignatureCheck(c *gin.Context) {
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l := m.log.WithField("func", "DomainBlockChecker")
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// set this extra field for signature validation
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c.Request.Header.Set("host", m.config.Host)
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// create the verifier from the request
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// if the request is signed, it will have a signature header
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verifier, err := httpsig.NewVerifier(c.Request)
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if err == nil {
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// the request was signed!
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// The key ID should be given in the signature so that we know where to fetch it from the remote server.
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// This will be something like https://example.org/users/whatever_requesting_user#main-key
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requestingPublicKeyID, err := url.Parse(verifier.KeyId())
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if err == nil && requestingPublicKeyID != nil {
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// we managed to parse the url!
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// if the domain is blocked we want to bail as early as possible
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blocked, err := m.db.IsURIBlocked(c.Request.Context(), requestingPublicKeyID)
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if err != nil {
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l.Errorf("could not tell if domain %s was blocked or not: %s", requestingPublicKeyID.Host, err)
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c.AbortWithStatus(http.StatusInternalServerError)
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return
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}
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if blocked {
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l.Infof("domain %s is blocked", requestingPublicKeyID.Host)
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c.AbortWithStatus(http.StatusForbidden)
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return
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}
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// set the verifier on the context here to save some work further down the line
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c.Set(string(util.APRequestingPublicKeyVerifier), verifier)
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}
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}
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}
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