owncast/router/middleware/auth.go
2021-08-03 12:23:20 -07:00

112 lines
3.7 KiB
Go

package middleware
import (
"crypto/subtle"
"net/http"
"strings"
"github.com/owncast/owncast/core/data"
"github.com/owncast/owncast/core/user"
log "github.com/sirupsen/logrus"
)
type ExternalAccessTokenHandlerFunc func(user.ExternalAPIUser, http.ResponseWriter, *http.Request)
// RequireAdminAuth wraps a handler requiring HTTP basic auth for it using the given
// the stream key as the password and and a hardcoded "admin" for username.
func RequireAdminAuth(handler http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
username := "admin"
password := data.GetStreamKey()
realm := "Owncast Authenticated Request"
// The following line is kind of a work around.
// If you want HTTP Basic Auth + Cors it requires _explicit_ origins to be provided in the
// Access-Control-Allow-Origin header. So we just pull out the origin header and specify it.
// If we want to lock down admin APIs to not be CORS accessible for anywhere, this is where we would do that.
w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin"))
w.Header().Set("Access-Control-Allow-Credentials", "true")
w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")
// For request needing CORS, send a 204.
if r.Method == "OPTIONS" {
w.WriteHeader(http.StatusNoContent)
return
}
user, pass, ok := r.BasicAuth()
// Failed
if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 {
w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`)
http.Error(w, "Unauthorized", http.StatusUnauthorized)
log.Debugln("Failed authentication for", r.URL.Path, "from", r.RemoteAddr, r.UserAgent())
return
}
handler(w, r)
}
}
func accessDenied(w http.ResponseWriter) {
w.WriteHeader(http.StatusUnauthorized) //nolint
w.Write([]byte("unauthorized")) //nolint
}
// RequireExternalAPIAccessToken will validate a 3rd party access token.
func RequireExternalAPIAccessToken(scope string, handler ExternalAccessTokenHandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// We should accept 3rd party preflight OPTIONS requests.
if r.Method == "OPTIONS" {
// All OPTIONS requests should have a wildcard CORS header.
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusNoContent)
return
}
authHeader := strings.Split(r.Header.Get("Authorization"), "Bearer ")
token := strings.Join(authHeader, "")
if len(authHeader) == 0 || token == "" {
log.Warnln("invalid access token")
accessDenied(w)
return
}
integration, err := user.GetExternalAPIUserForAccessTokenAndScope(token, scope)
if integration == nil || err != nil {
accessDenied(w)
return
}
// All auth'ed 3rd party requests should have a wildcard CORS header.
w.Header().Set("Access-Control-Allow-Origin", "*")
handler(*integration, w, r)
if err := user.SetExternalAPIUserAccessTokenAsUsed(token); err != nil {
log.Debugln("token not found when updating last_used timestamp")
}
})
}
// RequireUserAccessToken will validate a provided user's access token and make sure the associated user is enabled.
// Not to be used for validating 3rd party access.
func RequireUserAccessToken(handler http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
accessToken := r.URL.Query().Get("accessToken")
if accessToken == "" {
accessDenied(w)
return
}
// A user is required to use the websocket
user := user.GetUserByToken(accessToken)
if user == nil || !user.IsEnabled() {
accessDenied(w)
return
}
handler(w, r)
})
}