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cmd/relaypoolsrv: Allow validation of relay join requests by certificate (fixes #7196) (#7217)

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This commit is contained in:
Roberto Santalla 2020-12-21 11:55:16 +01:00 committed by GitHub
parent c845e245a1
commit b5de49917c
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 41 additions and 4 deletions
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21
cmd/strelaypoolsrv/main.go
View File

@ -6,9 +6,11 @@ import (
"compress/gzip"
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"flag"
"fmt"
"github.com/syncthing/syncthing/lib/protocol"
"io"
"io/ioutil"
"log"
@ -208,6 +210,7 @@ func main() {
tlsCfg := &tls.Config{
Certificates: []tls.Certificate{cert},
MinVersion: tls.VersionTLS10, // No SSLv3
ClientAuth: tls.RequestClientCert,
CipherSuites: []uint16{
// No RC4
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
@ -338,6 +341,12 @@ func handleGetRequest(rw http.ResponseWriter, r *http.Request) {
}
func handlePostRequest(w http.ResponseWriter, r *http.Request) {
var relayCert *x509.Certificate
if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
relayCert = r.TLS.PeerCertificates[0]
log.Printf("Got TLS cert from relay server")
}
var newRelay relay
err := json.NewDecoder(r.Body).Decode(&newRelay)
r.Body.Close()
@ -359,6 +368,16 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
return
}
if relayCert != nil {
advertisedId := uri.Query().Get("id")
idFromCert := protocol.NewDeviceID(relayCert.Raw).String()
if advertisedId != idFromCert {
log.Println("Warning: Relay server requested to join with an ID different from the join request, rejecting")
http.Error(w, "mismatched advertised id and join request cert", http.StatusBadRequest)
return
}
}
host, port, err := net.SplitHostPort(uri.Host)
if err != nil {
if debug {
@ -379,7 +398,7 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
if ip == nil || ip.IsUnspecified() {
uri.Host = net.JoinHostPort(rhost, port)
newRelay.URL = uri.String()
} else if host != rhost {
} else if host != rhost && relayCert == nil {
if debug {
log.Println("IP address advertised does not match client IP address", r.RemoteAddr, uri)
}

2
cmd/strelaysrv/main.go
View File

@ -247,7 +247,7 @@ func main() {
for _, pool := range pools {
pool = strings.TrimSpace(pool)
if len(pool) > 0 {
go poolHandler(pool, uri, mapping)
go poolHandler(pool, uri, mapping, cert)
}
}

22
cmd/strelaysrv/pool.go
View File

@ -4,6 +4,7 @@ package main
import (
"bytes"
"crypto/tls"
"encoding/json"
"io/ioutil"
"log"
@ -16,7 +17,7 @@ const (
httpStatusEnhanceYourCalm = 429
)
func poolHandler(pool string, uri *url.URL, mapping mapping) {
func poolHandler(pool string, uri *url.URL, mapping mapping, ownCert tls.Certificate) {
if debug {
log.Println("Joining", pool)
}
@ -31,7 +32,24 @@ func poolHandler(pool string, uri *url.URL, mapping mapping) {
uriCopy.String(),
})
resp, err := httpClient.Post(pool, "application/json", &b)
poolUrl, err := url.Parse(pool)
if err != nil {
log.Printf("Could not parse pool url '%s': %v", pool, err)
}
client := http.DefaultClient
if poolUrl.Scheme == "https" {
// Sent our certificate in join request
client = &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
Certificates: []tls.Certificate{ownCert},
},
},
}
}
resp, err := client.Post(pool, "application/json", &b)
if err != nil {
log.Printf("Error joining pool %v: HTTP request: %v", pool, err)
time.Sleep(time.Minute)