Infrastructure/imageproxy
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remove specific denial error from response

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the specific denial error message reveals more about the imageproxy
configuration than it should, such as what hosts are denied.  Instead,
log the full error, but return a generic message that the requested URL
is not allowed.
This commit is contained in:
Will Norris 2019-03-22 03:44:36 +00:00
parent 2612fa4111
commit 7e19b5ca6b
1 changed files with 16 additions and 8 deletions
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24
imageproxy.go
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@ -22,6 +22,7 @@ import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"errors"
"fmt"
"io"
"io/ioutil"
@ -152,8 +153,8 @@ func (p *Proxy) serveImage(w http.ResponseWriter, r *http.Request) {
req.Options.ScaleUp = p.ScaleUp
if err := p.allowed(req); err != nil {
log.Print(err)
http.Error(w, err.Error(), http.StatusForbidden)
log.Printf("%s: %v", err, req)
http.Error(w, msgNotAllowed, http.StatusForbidden)
return
}
@ -184,9 +185,8 @@ func (p *Proxy) serveImage(w http.ResponseWriter, r *http.Request) {
contentType, _, _ := mime.ParseMediaType(resp.Header.Get("Content-Type"))
if resp.ContentLength != 0 && !contentTypeMatches(p.ContentTypes, contentType) {
msg := fmt.Sprintf("forbidden content-type: %q", contentType)
log.Print(msg)
http.Error(w, msg, http.StatusForbidden)
log.Printf("content-type not allowed: %q", contentType)
http.Error(w, msgNotAllowed, http.StatusForbidden)
return
}
w.Header().Set("Content-Type", contentType)
@ -217,6 +217,14 @@ func copyHeader(dst, src http.Header, keys ...string) {
}
}
var (
errReferrer = errors.New("request does not contain an allowed referrer")
errDeniedHost = errors.New("request contains a denied host")
errNotAllowed = errors.New("request does not contain an allowed host or valid signature")
msgNotAllowed = "requested URL is not allowed"
)
// allowed determines whether the specified request contains an allowed
// referrer, host, and signature. It returns an error if the request is not
// allowed.
@ -226,11 +234,11 @@ func (p *Proxy) allowed(r *Request) error {
p.AllowHosts = p.Whitelist
}
if len(p.Referrers) > 0 && !referrerMatches(p.Referrers, r.Original) {
return fmt.Errorf("request does not contain an allowed referrer: %v", r)
return errReferrer
}
if hostMatches(p.DenyHosts, r.URL) {
return fmt.Errorf("request contains a denied host %v", r)
return errDeniedHost
}
if len(p.AllowHosts) == 0 && len(p.SignatureKey) == 0 {
@ -245,7 +253,7 @@ func (p *Proxy) allowed(r *Request) error {
return nil
}
return fmt.Errorf("request does not contain an allowed host or valid signature: %v", r)
return errNotAllowed
}
// contentTypeMatches returns whether contentType matches one of the allowed patterns.