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Add support for multiple trusted headers

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This commit is contained in:
Martin Polden 2018-07-25 21:05:08 +02:00
parent e282ac2729
commit 91f0c17c94
3 changed files with 33 additions and 26 deletions
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20
cmd/ipd/main.go
View File

@ -14,13 +14,13 @@ import (
func main() {
var opts struct {
CountryDBPath string `short:"f" long:"country-db" description:"Path to GeoIP country database" value-name:"FILE" default:""`
CityDBPath string `short:"c" long:"city-db" description:"Path to GeoIP city database" value-name:"FILE" default:""`
Listen string `short:"l" long:"listen" description:"Listening address" value-name:"ADDR" default:":8080"`
ReverseLookup bool `short:"r" long:"reverse-lookup" description:"Perform reverse hostname lookups"`
PortLookup bool `short:"p" long:"port-lookup" description:"Enable port lookup"`
Template string `short:"t" long:"template" description:"Path to template" default:"index.html" value-name:"FILE"`
IPHeader string `short:"H" long:"trusted-header" description:"Header to trust for remote IP, if present (e.g. X-Real-IP)" value-name:"NAME"`
CountryDBPath string `short:"f" long:"country-db" description:"Path to GeoIP country database" value-name:"FILE" default:""`
CityDBPath string `short:"c" long:"city-db" description:"Path to GeoIP city database" value-name:"FILE" default:""`
Listen string `short:"l" long:"listen" description:"Listening address" value-name:"ADDR" default:":8080"`
ReverseLookup bool `short:"r" long:"reverse-lookup" description:"Perform reverse hostname lookups"`
PortLookup bool `short:"p" long:"port-lookup" description:"Enable port lookup"`
Template string `short:"t" long:"template" description:"Path to template" default:"index.html" value-name:"FILE"`
IPHeaders []string `short:"H" long:"trusted-header" description:"Header to trust for remote IP, if present (e.g. X-Real-IP)" value-name:"NAME"`
}
_, err := flags.ParseArgs(&opts, os.Args)
if err != nil {
@ -35,7 +35,7 @@ func main() {
server := http.New(db)
server.Template = opts.Template
server.IPHeader = opts.IPHeader
server.IPHeaders = opts.IPHeaders
if opts.ReverseLookup {
log.Println("Enabling reverse lookup")
server.LookupAddr = iputil.LookupAddr
@ -44,8 +44,8 @@ func main() {
log.Println("Enabling port lookup")
server.LookupPort = iputil.LookupPort
}
if opts.IPHeader != "" {
log.Printf("Trusting header %s to contain correct remote IP", opts.IPHeader)
if len(opts.IPHeaders) > 0 {
log.Printf("Trusting header(s) %+v to contain correct remote IP", opts.IPHeaders)
}
log.Printf("Listening on http://%s", opts.Listen)

18
http/http.go
View File

@ -22,7 +22,7 @@ const (
type Server struct {
Template string
IPHeader string
IPHeaders []string
LookupAddr func(net.IP) (string, error)
LookupPort func(net.IP, uint64) error
db database.Client
@ -47,8 +47,14 @@ func New(db database.Client) *Server {
return &Server{db: db}
}
func ipFromRequest(header string, r *http.Request) (net.IP, error) {
remoteIP := r.Header.Get(header)
func ipFromRequest(headers []string, r *http.Request) (net.IP, error) {
remoteIP := ""
for _, header := range headers {
remoteIP = r.Header.Get(header)
if remoteIP != "" {
break
}
}
if remoteIP == "" {
host, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
@ -64,7 +70,7 @@ func ipFromRequest(header string, r *http.Request) (net.IP, error) {
}
func (s *Server) newResponse(r *http.Request) (Response, error) {
ip, err := ipFromRequest(s.IPHeader, r)
ip, err := ipFromRequest(s.IPHeaders, r)
if err != nil {
return Response{}, err
}
@ -91,7 +97,7 @@ func (s *Server) newPortResponse(r *http.Request) (PortResponse, error) {
if err != nil || port < 1 || port > 65355 {
return PortResponse{Port: port}, fmt.Errorf("invalid port: %d", port)
}
ip, err := ipFromRequest(s.IPHeader, r)
ip, err := ipFromRequest(s.IPHeaders, r)
if err != nil {
return PortResponse{Port: port}, err
}
@ -104,7 +110,7 @@ func (s *Server) newPortResponse(r *http.Request) (PortResponse, error) {
}
func (s *Server) CLIHandler(w http.ResponseWriter, r *http.Request) *appError {
ip, err := ipFromRequest(s.IPHeader, r)
ip, err := ipFromRequest(s.IPHeaders, r)
if err != nil {
return internalServerError(err)
}

21
http/http_test.go
View File

@ -149,16 +149,17 @@ func TestJSONHandlers(t *testing.T) {
func TestIPFromRequest(t *testing.T) {
var tests = []struct {
remoteAddr string
headerKey string
headerValue string
trustedHeader string
out string
remoteAddr string
headerKey string
headerValue string
trustedHeaders []string
out string
}{
{"127.0.0.1:9999", "", "", "", "127.0.0.1"}, // No header given
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", "", "127.0.0.1"}, // Trusted header is empty
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", "X-Foo-Bar", "127.0.0.1"}, // Trusted header does not match
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", "X-Real-IP", "1.3.3.7"}, // Trusted header matches
{"127.0.0.1:9999", "", "", nil, "127.0.0.1"}, // No header given
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", nil, "127.0.0.1"}, // Trusted header is empty
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", []string{"X-Foo-Bar"}, "127.0.0.1"}, // Trusted header does not match
{"127.0.0.1:9999", "X-Real-IP", "1.3.3.7", []string{"X-Real-IP", "X-Forwarded-For"}, "1.3.3.7"}, // Trusted header matches
{"127.0.0.1:9999", "X-Forwarded-For", "1.3.3.7", []string{"X-Real-IP", "X-Forwarded-For"}, "1.3.3.7"}, // Second trusted header matches
}
for _, tt := range tests {
r := &http.Request{
@ -166,7 +167,7 @@ func TestIPFromRequest(t *testing.T) {
Header: http.Header{},
}
r.Header.Add(tt.headerKey, tt.headerValue)
ip, err := ipFromRequest(tt.trustedHeader, r)
ip, err := ipFromRequest(tt.trustedHeaders, r)
if err != nil {
t.Fatal(err)
}