gotosocial/internal/api/security/signaturecheck.go
Tobi Smethurst d389e7b150
Domain block (#76)
* start work on admin domain blocking

* move stuff around + further work on domain blocks

* move + restructure processor

* prep work for deleting account

* tidy

* go fmt

* formatting

* domain blocking more work

* check domain blocks way earlier on

* progress on delete account

* delete more stuff when an account is gone

* and more...

* domain blocky block block

* get individual domain block, delete a block
2021-07-05 13:23:03 +02:00

69 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 := &gtsmodel.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
}