/
http.go
205 lines (174 loc) · 4.61 KB
/
http.go
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package resolver
import (
"bytes"
"context"
"crypto/sha256"
"errors"
"net"
"net/http"
"runtime"
"strings"
"github.com/gorilla/mux"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
. "github.com/onlineconf/onlineconf/admin/go/common"
)
var (
ErrEmptyIP = errors.New("IP address is empty")
ErrParseIP = errors.New("Failed to parse IP address")
)
type Server struct {
Host string
IP net.IP
Datacenter string
}
var configSemaphore chan struct{}
func init() {
maxResolvers := int(0.8 * float32(runtime.GOMAXPROCS(0)))
if maxResolvers < 1 {
maxResolvers = 1
}
configSemaphore = make(chan struct{}, maxResolvers)
}
func authMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
if username, password, ok := req.BasicAuth(); ok {
pwdHash, usernameExists := treeI.getServicePwdHash(username)
if usernameExists && pwdHashEquals(req.Context(), pwdHash, password) {
req = AddUsernameToRequest(req, username)
next.ServeHTTP(w, req)
return
}
}
w.Header().Add("WWW-Authenticate", "Basic realm=onlineconf-updater")
w.WriteHeader(401)
})
}
func RegisterRoutes(r *mux.Router) {
r.Use(authMiddleware)
r.Path("/config").Methods("GET").HandlerFunc(serveConfig)
r.Path("/activity").Methods("POST").HandlerFunc(serveActivity)
}
func serveConfig(w http.ResponseWriter, req *http.Request) {
server, clientMTime := serverStatus(w, req)
if server == nil {
return
}
mtime := treeI.mtime
if clientMTime >= mtime {
w.Header().Add("X-OnlineConf-Admin-Last-Modified", mtime)
http.Error(w, "", 304)
return
}
configSemaphore <- struct{}{}
defer func() { <-configSemaphore }()
sg := newServerGraph(req.Context(), &treeI, *server)
if sg.suspended(req.Context()) {
log.Ctx(req.Context()).Info().Msg("suspended")
w.Header().Set("X-OnlineConf-Suspended", "true")
w.Header().Add("X-OnlineConf-Admin-Last-Modified", clientMTime)
http.Error(w, "", 304)
return
}
ser := newSerializer(req.Context(), sg, strings.HasPrefix(req.UserAgent(), "libwww-perl"))
body, err := ser.serialize()
if err != nil {
WriteServerError(req.Context(), w, err)
return
}
w.Header().Add("X-OnlineConf-Admin-Last-Modified", sg.mtime)
w.Write(body)
}
func serveActivity(w http.ResponseWriter, req *http.Request) {
server, _ := serverStatus(w, req)
if server != nil {
w.WriteHeader(200)
}
}
func serverStatus(w http.ResponseWriter, req *http.Request) (*Server, string) {
server, err := authenticateByIP(req)
if err != nil {
WriteServerError(req.Context(), w, err)
return nil, ""
}
if server == nil {
http.Error(w, "", 403)
return nil, ""
}
log.Ctx(req.Context()).Info().Str("host", server.Host).Str("ip", server.IP.String()).Msg("")
server.Datacenter = req.Header.Get("X-OnlineConf-Client-Datacenter")
clientVersion := req.Header.Get("X-OnlineConf-Client-Version")
if clientVersion == "" {
http.Error(w, "Invalid X-OnlineConf-Client-Version", 400)
return nil, ""
}
clientMTime := req.Header.Get("X-OnlineConf-Client-MTime")
if clientVersion != "TEST" && server.Host != "" {
err = updateServerActivity(req.Context(), server, clientMTime, clientVersion)
if err != nil {
WriteServerError(req.Context(), w, err)
return nil, ""
}
}
return server, clientMTime
}
func authenticateByIP(req *http.Request) (*Server, error) {
ipstr, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
ipstr = req.RemoteAddr
}
if ipstr == "" {
return nil, ErrEmptyIP
}
ip := net.ParseIP(ipstr)
if ip == nil {
return nil, ErrParseIP
}
ephemeralIPs := treeI.getEphemeralIPs()
for _, ipnet := range ephemeralIPs {
if ipnet.Contains(ip) {
return &Server{IP: ip}, nil
}
}
host := req.Header.Get("X-OnlineConf-Client-Host")
if host == "" {
hosts, err := net.LookupAddr(ipstr)
if err != nil {
return nil, err
}
if len(hosts) == 0 {
return nil, nil
}
if len(hosts) > 1 {
arr := zerolog.Arr()
for _, host := range hosts {
arr.Str(host)
}
log.Ctx(req.Context()).Warn().Str("ip", ipstr).Array("hosts", arr).Msg("more then one PTR record found")
}
host = hosts[0]
}
ips, err := net.LookupHost(host)
if err != nil {
return nil, err
}
ok := false
for _, ip := range ips {
if ip == ipstr {
ok = true
break
}
}
if !ok {
return nil, nil
}
return &Server{Host: strings.TrimSuffix(host, "."), IP: ip}, nil
}
func pwdHashEquals(ctx context.Context, pwdHash []byte, password string) bool {
h := sha256.New()
if _, err := h.Write([]byte(password)); err != nil {
log.Ctx(ctx).Error().Err(err).Msg("failed to calculate sha256 hash")
return false
}
return bytes.Equal(pwdHash, h.Sum(nil))
}