Set CSP-Nonce #17

As we overwrite kopano-index handler to serve index from vfs, we need to do this manually.

go.mod

@@ -19,7 +19,8 @@ require (
 	github.com/spf13/viper v1.6.1
 	go.opencensus.io v0.22.2
 	golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa
-	stash.kopano.io/kc/konnect v0.28.0
+	stash.kopano.io/kc/konnect v0.28.1
+	stash.kopano.io/kgol/rndm v1.1.0
 )
 
 replace stash.kopano.io/kc/konnect => github.com/IljaN/konnect v0.29.0-alpha2

pkg/service/v0/service.go

@@ -18,6 +18,7 @@ import (
 	"stash.kopano.io/kc/konnect/bootstrap"
 	kcconfig "stash.kopano.io/kc/konnect/config"
 	"stash.kopano.io/kc/konnect/server"
+	"stash.kopano.io/kgol/rndm"
 )
 
 // Service defines the extension handlers.
@@ -212,9 +213,11 @@ func (k Konnectd) Index() http.HandlerFunc {
 
 	// TODO add environment variable to make the path prefix configurable
 	pp := "/signin/v1"
-
 	indexHTML := bytes.Replace(template, []byte("__PATH_PREFIX__"), []byte(pp), 1)
 
+	nonce := rndm.GenerateRandomString(32)
+	indexHTML = bytes.Replace(indexHTML, []byte("__CSP_NONCE__"), []byte(nonce), 1)
+
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
 		w.Write(indexHTML)