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Use r.RemoteAddr to check /metrics endpoint network access

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HTTP headers like X-Forwarded-For or X-Real-Ip can be easily spoofed. As
such, it cannot be used to test if the client IP is allowed.

The recommendation is to use HTTP Basic authentication to protect the
metrics endpoint, or run Miniflux behind a trusted reverse-proxy.
This commit is contained in:
Frédéric Guillot 2023-03-11 20:36:52 -08:00
parent 877dbed5e8
commit b46b5dfb2a
2 changed files with 19 additions and 13 deletions
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23
http/request/client_ip.go
View file

@ -10,15 +10,7 @@ import (
"strings" "strings"
) )
func dropIPv6zone(address string) string { // FindClientIP returns the client real IP address based on trusted Reverse-Proxy HTTP headers.
i := strings.IndexByte(address, '%')
if i != -1 {
address = address[:i]
}
return address
}
// FindClientIP returns client real IP address.
func FindClientIP(r *http.Request) string { func FindClientIP(r *http.Request) string {
headers := []string{"X-Forwarded-For", "X-Real-Ip"} headers := []string{"X-Forwarded-For", "X-Real-Ip"}
for _, header := range headers { for _, header := range headers {
@ -36,6 +28,11 @@ func FindClientIP(r *http.Request) string {
} }
// Fallback to TCP/IP source IP address. // Fallback to TCP/IP source IP address.
return FindRemoteIP(r)
}
// FindRemoteIP returns remote client IP address.
func FindRemoteIP(r *http.Request) string {
remoteIP, _, err := net.SplitHostPort(r.RemoteAddr) remoteIP, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil { if err != nil {
remoteIP = r.RemoteAddr remoteIP = r.RemoteAddr
@ -49,3 +46,11 @@ func FindClientIP(r *http.Request) string {
return remoteIP return remoteIP
} }
func dropIPv6zone(address string) string {
i := strings.IndexByte(address, '%')
if i != -1 {
address = address[:i]
}
return address
}

9
service/httpd/httpd.go
View file

@ -208,7 +208,7 @@ func setupHandler(store *storage.Storage, pool *worker.Pool) *mux.Router {
// Returns a 404 if the client is not authorized to access the metrics endpoint. // Returns a 404 if the client is not authorized to access the metrics endpoint.
if route.GetName() == "metrics" && !isAllowedToAccessMetricsEndpoint(r) { if route.GetName() == "metrics" && !isAllowedToAccessMetricsEndpoint(r) {
logger.Error(`[Metrics] Client not allowed: %s`, request.ClientIP(r)) logger.Error(`[Metrics] [ClientIP=%s] Client not allowed (%s)`, request.ClientIP(r), r.RemoteAddr)
http.NotFound(w, r) http.NotFound(w, r)
return return
} }
@ -222,9 +222,8 @@ func setupHandler(store *storage.Storage, pool *worker.Pool) *mux.Router {
} }
func isAllowedToAccessMetricsEndpoint(r *http.Request) bool { func isAllowedToAccessMetricsEndpoint(r *http.Request) bool {
clientIP := request.ClientIP(r)
if config.Opts.MetricsUsername() != "" && config.Opts.MetricsPassword() != "" { if config.Opts.MetricsUsername() != "" && config.Opts.MetricsPassword() != "" {
clientIP := request.ClientIP(r)
username, password, authOK := r.BasicAuth() username, password, authOK := r.BasicAuth()
if !authOK { if !authOK {
logger.Info("[Metrics] [ClientIP=%s] No authentication header sent", clientIP) logger.Info("[Metrics] [ClientIP=%s] No authentication header sent", clientIP)
@ -248,7 +247,9 @@ func isAllowedToAccessMetricsEndpoint(r *http.Request) bool {
logger.Fatal(`[Metrics] Unable to parse CIDR %v`, err) logger.Fatal(`[Metrics] Unable to parse CIDR %v`, err)
} }
if network.Contains(net.ParseIP(clientIP)) { // We use r.RemoteAddr in this case because HTTP headers like X-Forwarded-For can be easily spoofed.
// The recommendation is to use HTTP Basic authentication.
if network.Contains(net.ParseIP(request.FindRemoteIP(r))) {
return true return true
} }
} }