70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
|
package security
|
||
|
|
|
||
|
|
import (
|
||
|
|
"net/http"
|
||
|
|
"net/url"
|
||
|
|
|
||
|
|
"github.com/gin-gonic/gin"
|
||
|
|
"github.com/go-fed/httpsig"
|
||
|
|
"github.com/superseriousbusiness/gotosocial/internal/db"
|
||
|
|
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
|
||
|
|
"github.com/superseriousbusiness/gotosocial/internal/util"
|
||
|
|
)
|
||
|
|
|
||
|
|
// SignatureCheck checks whether an incoming http request has been signed. If so, it will check if the domain
|
||
|
|
// that signed the request is permitted to access the server. If it is permitted, the handler will set the key
|
||
|
|
// verifier in the gin context for use down the line.
|
||
|
|
func (m *Module) SignatureCheck(c *gin.Context) {
|
||
|
|
l := m.log.WithField("func", "DomainBlockChecker")
|
||
|
|
|
||
|
|
// set this extra field for signature validation
|
||
|
|
c.Request.Header.Set("host", m.config.Host)
|
||
|
|
|
||
|
|
// create the verifier from the request
|
||
|
|
// if the request is signed, it will have a signature header
|
||
|
|
verifier, err := httpsig.NewVerifier(c.Request)
|
||
|
|
if err == nil {
|
||
|
|
// the request was signed!
|
||
|
|
|
||
|
|
// The key ID should be given in the signature so that we know where to fetch it from the remote server.
|
||
|
|
// This will be something like https://example.org/users/whatever_requesting_user#main-key
|
||
|
|
requestingPublicKeyID, err := url.Parse(verifier.KeyId())
|
||
|
|
if err == nil && requestingPublicKeyID != nil {
|
||
|
|
// we managed to parse the url!
|
||
|
|
|
||
|
|
// if the domain is blocked we want to bail as early as possible
|
||
|
|
blockedDomain, err := m.blockedDomain(requestingPublicKeyID.Host)
|
||
|
|
if err != nil {
|
||
|
|
l.Errorf("could not tell if domain %s was blocked or not: %s", requestingPublicKeyID.Host, err)
|
||
|
|
c.AbortWithStatus(http.StatusInternalServerError)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if blockedDomain {
|
||
|
|
l.Infof("domain %s is blocked", requestingPublicKeyID.Host)
|
||
|
|
c.AbortWithStatus(http.StatusForbidden)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
// set the verifier on the context here to save some work further down the line
|
||
|
|
c.Set(string(util.APRequestingPublicKeyVerifier), verifier)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *Module) blockedDomain(host string) (bool, error) {
|
||
|
|
b := >smodel.DomainBlock{}
|
||
|
|
err := m.db.GetWhere([]db.Where{{Key: "domain", Value: host, CaseInsensitive: true}}, b)
|
||
|
|
if err == nil {
|
||
|
|
// block exists
|
||
|
|
return true, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
if _, ok := err.(db.ErrNoEntries); ok {
|
||
|
|
// there are no entries so there's no block
|
||
|
|
return false, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// there's an actual error
|
||
|
|
return false, err
|
||
|
|
}
|