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server.go
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server.go
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package tunnel
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/paralus/relay/pkg/proxy"
"github.com/paralus/relay/pkg/relaylogger"
"github.com/paralus/relay/pkg/sessions"
"github.com/inconshreveable/go-vhost"
peerclient "github.com/paralus/paralus/pkg/sentry/peering"
"github.com/paralus/relay/pkg/audit"
"github.com/paralus/relay/pkg/utils"
"golang.org/x/net/http2"
)
// Server server definition
type Server struct {
// Type of the server. Relay means user-facing
// Dialin means cluster-facing
Type string
// Name specifies the service names example kubectl, kubeweb, etc.
Name string
// ServerName of the listening server.
ServerName string
// Protocol specifies protocol used http(s)
Protocol string
// RootCA used to verify TLS client connections
RootCA []byte
// ServerCRT used for the server
ServerCRT []byte
// ServerKEY used for the server
ServerKEY []byte
// DialinServerName specify the dialin server name
// valid only for relay server types.
DialinServerName string
// ProbeSNI specifies sni used to find peers
//ProbeSNI string
// DialinPool where dialin connections are parked
// valid only for dialin server types
DialinPool *dialinPool
// httpClient used to forward users connections to dialin
httpClient *http.Client
// httpServer used to server user connections
httpServer *http.Server
Provisioner *authzProvisioner
auditPath string
}
// RelayConn connection info
type RelayConn struct {
// Conn is the network connection
Conn net.Conn
// Type of the server. Relay means user-facing
// Dialin means cluster-facing
Type string
// ServerName of the server which accepted the connection
ServerName string
// CertSNI derived from client certificate
CertSNI string
// PeerID derived from client certificate
PeerID string
// server block of this connection
server *Server
// dialinCachedKey already stiched to a dialin
dialinCachedKey string
}
// ServerListen defines a listen object
type ServerListen struct {
// Addr specifies the listen address
Addr string
// Protocol of all servers listening in above address
Protocol string
// RootCAs used to verify TLS client connections
RootCAs []string
// List of certs used to terminate listening *.format supported
Certs []utils.SNICertificate
// ServerList are the servers using above listen address
ServerList []*Server
//Mux tls sni muxer
Mux *vhost.TLSMuxer
}
type kubeError struct {
Kind string `json:"kind"`
APIVersion string `json:"apiVersion"`
Metadata []string `json:"metadata"`
Status string `json:"status"`
Message string `json:"message"`
Reason string `json:"reason"`
Code int `json:"code"`
}
var (
//Config server config
Config *ServerConfig
//Servers map, key by ServerName
Servers = make(map[string]*Server)
//ServerAddrs Servers grouped with listen address
ServerAddrs = make(map[string][]*Server)
//ServerListeners list of listen objects
ServerListeners []*ServerListen
// connections list of relay net.Conn/tls.Conn ojects
connections = make(map[string]*RelayConn)
// connectionsRWMu read write lock for the Connections map
connectionsRWMu sync.RWMutex
slog *relaylogger.RelayLog
)
func (srv *Server) disconnected(addr string) {
s := strings.Split(addr, utils.JoinString)
if len(s) < 3 {
slog.Error(
fmt.Errorf("error from disconnected callback invalid key"),
addr,
)
return
}
remoteAddr := s[2]
if remoteAddr != "" {
deleteConnections(remoteAddr)
}
}
// loadRelayServers from configuration
// This creates a server objects and add to
// Servers map with key as server name (*.DNS)
func loadRelayServers(config *ServerConfig) {
slog.Info("Loading Servers form config")
// Process config to prepare kubectl relay servers
for name, relay := range config.Relays {
provisioner, err := newAuthzProvisioner()
if err != nil {
slog.Error(err, "Unable to create provisioned")
return
}
Servers[relay.ServerName] = &Server{
Type: utils.RELAY,
Name: name,
ServerName: relay.ServerName,
RootCA: relay.RootCA,
ServerCRT: relay.ServerCRT,
ServerKEY: relay.ServerKEY,
Protocol: relay.Protocol,
DialinServerName: relay.DialinSfx,
httpServer: &http.Server{},
Provisioner: provisioner,
auditPath: config.AuditPath,
}
if len(ServerAddrs[relay.Addr]) > 0 {
// check protocol
if ServerAddrs[relay.Addr][0].Protocol == relay.Protocol {
ServerAddrs[relay.Addr] = append(ServerAddrs[relay.Addr], Servers[relay.ServerName])
} else {
// all servers listening on same address should have same
// protocol
slog.Info(
"Protocol missmatch for same addresses in relay",
"name", name,
"address", relay.Addr,
"protocol", relay.Protocol,
"expected", ServerAddrs[relay.Addr][0].Protocol,
)
}
} else {
ServerAddrs[relay.Addr] = append(ServerAddrs[relay.Addr], Servers[relay.ServerName])
}
}
// Process config to prepare cd relay servers
for name, relay := range config.CDRelays {
Servers[relay.ServerName] = &Server{
Type: utils.CDRELAY,
Name: name,
ServerName: relay.ServerName,
RootCA: relay.RootCA,
ServerCRT: relay.ServerCRT,
ServerKEY: relay.ServerKEY,
Protocol: relay.Protocol,
DialinServerName: relay.DialinSfx,
auditPath: config.AuditPath,
}
if len(ServerAddrs[relay.Addr]) > 0 {
// check protocol
if ServerAddrs[relay.Addr][0].Protocol == relay.Protocol {
ServerAddrs[relay.Addr] = append(ServerAddrs[relay.Addr], Servers[relay.ServerName])
} else {
// all servers listening on same address should have same
// protocol
slog.Info(
"Protocol missmatch for same addresses in relay",
"name", name,
"address", relay.Addr,
"protocol", relay.Protocol,
"expected", ServerAddrs[relay.Addr][0].Protocol,
)
}
} else {
ServerAddrs[relay.Addr] = append(ServerAddrs[relay.Addr], Servers[relay.ServerName])
}
}
// Process config to prepare servers
for name, dialin := range config.Dialins {
s := &Server{
Type: utils.DIALIN,
Name: name,
ServerName: dialin.ServerName,
RootCA: dialin.RootCA,
ServerCRT: dialin.ServerCRT,
ServerKEY: dialin.ServerKEY,
Protocol: dialin.Protocol,
}
t := &http2.Transport{}
pool := newDialinPool(t, s.disconnected, slog)
t.ConnPool = pool
s.DialinPool = pool
s.httpClient = &http.Client{
Transport: t,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
Servers[dialin.ServerName] = s
if len(ServerAddrs[dialin.Addr]) > 0 {
// check protocol
if ServerAddrs[dialin.Addr][0].Protocol == dialin.Protocol {
ServerAddrs[dialin.Addr] = append(ServerAddrs[dialin.Addr], Servers[dialin.ServerName])
} else {
slog.Info(
"Protocol missmatch for same addresses in dilain",
"name", name,
"address", dialin.Addr,
"protocol", dialin.Protocol,
"expected", ServerAddrs[dialin.Addr][0].Protocol,
)
}
} else {
ServerAddrs[dialin.Addr] = append(ServerAddrs[dialin.Addr], Servers[dialin.ServerName])
}
}
slog.Debug(
"Loaded Servers",
"Servers", Servers,
)
slog.Debug(
"Loaded ServerAddrs",
"ServerAddrs", ServerAddrs,
)
// Prepare listener list
for name, srvlst := range ServerAddrs {
var listenAddr string
// override server listern address with relayIP if present.
// This is for running mutliple instance of relay in the same
// development host.
if utils.RelayIPFromConfig == "" {
listenAddr = name
} else {
listenAddr = utils.RelayIPFromConfig
}
srvlistener := &ServerListen{
Addr: listenAddr,
Protocol: srvlst[0].Protocol,
ServerList: srvlst,
}
// set the list cert/key paires for this listener
for _, srv := range srvlst {
snicert := utils.SNICertificate{
CertFile: srv.ServerCRT,
KeyFile: srv.ServerKEY,
}
srvlistener.Certs = append(srvlistener.Certs, snicert)
// set the rootCA list for this listener
srvlistener.RootCAs = append(srvlistener.RootCAs, string(srv.RootCA))
}
ServerListeners = append(ServerListeners, srvlistener)
}
slog.Info(
"Loaded server ",
"num-listeners", len(ServerListeners),
)
}
func (srv *Server) connectRequest(key string, msg *utils.ControlMessage, r io.Reader) (*http.Request, error) {
req, err := http.NewRequest(http.MethodPut, srv.DialinPool.URL(key), r)
if err != nil {
return nil, fmt.Errorf("could not create request: %s", err)
}
// write message to header
utils.WriteToHeader(req.Header, msg)
return req, nil
}
// dialinLookup check for cluster connection
func dialinCountLookup(sni string) int {
for _, dsrv := range Servers {
if dsrv.Type == utils.DIALIN {
// look dialin pool to find dilain connection key
cnt, err := dsrv.DialinPool.GetDialinConnectorCount(sni)
if err == nil {
return cnt
}
}
}
return 0
}
// ProcessPeerForwards ...
func (srv *Server) ProcessPeerForwards(w http.ResponseWriter, r *http.Request, lg *relaylogger.RelayLog, relayIP string, certIssue int64) {
lg.Debug("ProcessPeerForwards:", relayIP, r.TLS.ServerName)
_, port, err := net.SplitHostPort(relayIP)
if err != nil {
port = "443"
}
tlscfg, err := ClientTLSConfigFromBytes(srv.ServerCRT, srv.ServerKEY, srv.RootCA, r.TLS.ServerName+":"+port)
if err != nil {
lg.Error(
err,
"Failed to process peer configs",
)
return
}
//setsup the upgradeaware peer handler
peerHandler, err := proxy.PeerKubeHandler(tlscfg, relayIP)
if err != nil {
lg.Error(
err,
"unable to create peer handler",
)
return
}
utils.SetXForwardedFor(r.Header, r.RemoteAddr)
//Update the UUID in the header to detect loops
utils.SetXRAYUUID(r.Header)
r.Header.Set("X-Paralus-User-Cert-Issued", strconv.FormatInt(certIssue, 10))
// set peer security upstream headers
err = utils.PeerSetHeaderNonce(r.Header)
if err != nil {
lg.Error(
err,
"unable to set security headers in peer upstream",
)
return
}
//upgradeaware upstreaming
peerHandler.ServeHTTP(w, r)
lg.Debug(
"done Serving peerHandler.ServeHTTP ",
)
}
// ProcessCDPeerForwards ...
func (srv *Server) ProcessCDPeerForwards(ctx context.Context, conn net.Conn, lg *relaylogger.RelayLog, relayIP string, state tls.ConnectionState) {
var peerAddr string
lg.Debug("ProcessCDPeerForwards:", relayIP, state.ServerName)
_, port, err := net.SplitHostPort(relayIP)
if err != nil {
port = "443"
peerAddr = relayIP + ":443"
}
tlscfg, err := ClientTLSConfigFromBytes(srv.ServerCRT, srv.ServerKEY, srv.RootCA, state.ServerName+":"+port)
if err != nil {
lg.Error(
err,
"Failed to process peer configs",
)
return
}
pconn, err := tls.Dial("tcp", peerAddr, tlscfg)
if err != nil {
lg.Error(
err,
"failed to connect to peer",
"addr", peerAddr,
)
return
}
defer pconn.Close()
utils.Transfer(flushWriter{pconn, lg, pconn}, conn, lg, "client to cdpeer")
processCDPeerForwardDone:
for {
select {
case <-ctx.Done():
break processCDPeerForwardDone
}
}
// wait 2 sec before closing
time.Sleep(2 * time.Second)
return
}
// ProcessRelayRequest process user-facing request
func (srv *Server) ProcessRelayRequest(w http.ResponseWriter, r *http.Request, lg *relaylogger.RelayLog) {
var (
paralusUserName string
sessionKey string
clusterServerName string
clusterID string
dialinSNI string
certIssue int64
dialinAttempt int
ok bool
session *sessions.UserSession
)
srvlog := lg.WithName("RelayRequest")
srvlog.Debug(
"processing relay request",
)
// prepare the dilain lookup key
if r.TLS.ServerName == srv.ServerName {
srvlog.Error(
nil,
"Wildcard ServerName is expected",
"ServerName", srv.ServerName,
"expected SNI", "*."+srv.ServerName,
)
errStirng := "ERROR: Unauthenticated access not allowed. Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "invalid cert in kubeconfig", http.StatusUnauthorized)
return
}
srvlog.Debug("ProcessRelayRequest", "r.TLS.ServerName", r.TLS.ServerName, "srv.ServerName", srv.ServerName)
strs := strings.Split(r.TLS.ServerName, strings.ReplaceAll(srv.ServerName, "*", ""))
if len(strs) <= 0 {
srvlog.Error(
nil,
"ServeName is not the suffix of SNI",
"ServerName", srv.ServerName,
"SNI", r.TLS.ServerName,
)
errStirng := "ERROR: Unauthenticated access not allowed. Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "invalid cert in kubeconfig", http.StatusUnauthorized)
return
}
if len(r.TLS.PeerCertificates) <= 0 {
srvlog.Error(
nil,
"did not find any peer certificates in the request",
)
errStirng := "ERROR: Unauthenticated access not allowed. Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "invalid cert in kubeconfig", http.StatusUnauthorized)
return
}
if r.TLS.PeerCertificates[0].Subject.CommonName == "" {
srvlog.Error(
nil,
"cerficate CN is empty",
)
errStirng := "ERROR: Unauthenticated access not allowed. Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "invalid cert in kubeconfig", http.StatusUnauthorized)
return
}
issueDate := r.TLS.PeerCertificates[0].NotBefore
certIssue = issueDate.Unix()
srvlog.Debug("certificate usse epoch in secs", certIssue)
sessionKey = ""
session = nil
//check the request is from a peer relay
if r.Header.Get("X-Paralus-XRAY-RELAYUUID") == "" {
srvlog.Debug(
"procesing user request common name from cert",
"CN", r.TLS.PeerCertificates[0].Subject.CommonName,
)
//User name is extracted from client certificate CN
paralusUserName = r.TLS.PeerCertificates[0].Subject.CommonName
sessionKey = r.TLS.ServerName + ":" + paralusUserName
session, ok = sessions.GetUserSession(sessionKey)
if !ok {
//Create session for the user
session = &sessions.UserSession{
Type: srv.Type,
ServerName: srv.ServerName,
CertSNI: r.TLS.ServerName,
DialinCachedKey: "",
ErrorFlag: false,
}
sessions.AddUserSession(session, sessionKey)
srvlog.Info(
"Created new session",
"key", sessionKey,
)
} else {
srvlog.Debug(
"Found existing session",
"key", sessionKey,
"dialin sticky key", session.DialinCachedKey,
)
}
clusterID = strs[0]
dialinSNI = strings.ReplaceAll(srv.DialinServerName, "*", strs[0])
dialinAttempt = 0
} else {
var err error
// to protect from a bad actor injecting rogue headers we need
// to validate the request tls parametes to make sure the client cert
// has expcted values.
// 1. using a shared 256 key aes encryption blob added with a nonce
// validate the decrypted text using shared key produces expected result
// to make sure no tampering in headers
/*
if utils.CheckRelayLoops(r.Header) {
var allIds string
if uuidHdr, ok := r.Header["X-Paralus-XRAY-RELAYUUID"]; ok {
allIds = strings.Join(uuidHdr, ", ")
}
srvlog.Error(
fmt.Errorf("LOOP detected in peerforwards"),
"failed peer loop detection check RelayUUID", utils.RelayUUID,
"header X-Paralus-XRAY-RELAYUUID allIds", allIds,
)
}
*/
if !utils.CheckPeerHeaders(r.Header) {
srvlog.Error(
fmt.Errorf("failed to validate the peer upstream security header"),
"failed peer upstream due to secuity reasons",
)
errStirng := "ERROR: Unauthenticated access not allowed . Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "failed to validate request in peer proxy", http.StatusUnauthorized)
return
}
paralusUserName = r.Header.Get("X-Paralus-User")
clusterServerName = r.Header.Get("X-Paralus-Cluster-ServerName")
clusterID = utils.SanitizeValues(r.Header.Get("X-Paralus-Cluster-ID"))
issDateSecStr := r.Header.Get("X-Paralus-User-Cert-Issued")
if issDateSecStr == "" {
srvlog.Error(
fmt.Errorf("peer did not send a valid user cert issue date header"),
"failed peer upstream due to missing cert issuedate header",
)
}
certIssue, err = strconv.ParseInt(issDateSecStr, 10, 64)
if err != nil {
srvlog.Error(
fmt.Errorf("peer did not send a valid user cert issue date header"),
"failed peer upstream due to missing cert issuedate header",
)
}
srvlog.Debug(
"forwarded request from peer",
"paralusUserName", paralusUserName,
"clusterServerName", clusterServerName,
"clusterID", clusterID,
"certIssue:", certIssue,
)
if paralusUserName == "" || clusterServerName == "" || clusterID == "" {
srvlog.Error(
nil,
"Did not find required headers",
"X-Paralus-User", paralusUserName,
"X-Paralus-Cluster-Name", clusterServerName,
"X-Paralus-Cluster-ID", clusterID,
)
errStirng := "ERROR: Unauthenticated access not allowed (kubeconfig invalid cert). Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "failed to find user/cluster details", http.StatusUnauthorized)
return
}
sessionKey = clusterServerName + ":" + paralusUserName
session, ok = sessions.GetUserSession(sessionKey)
if !ok {
//Create session for the user
session = &sessions.UserSession{
Type: srv.Type,
ServerName: srv.ServerName,
CertSNI: clusterServerName,
DialinCachedKey: "",
ErrorFlag: false,
}
sessions.AddUserSession(session, sessionKey)
srvlog.Info(
"Created new session",
"key", sessionKey,
)
} else {
srvlog.Debug(
"Found existing session",
"key", sessionKey,
"dialin sticky key", session.DialinCachedKey,
)
}
//prifixName is the clusterid/uuid for the endpoint
dialinSNI = strings.ReplaceAll(srv.DialinServerName, "*", clusterID)
dialinAttempt = 0
}
r.Header.Set("X-Paralus-Audit", "yes")
retryDialin:
// get the dialin server instance
if dsrv, ok := Servers[srv.DialinServerName]; ok {
if session.DialinCachedKey == "" {
// look dialin pool to find dilain connection key
key, err := dsrv.DialinPool.GetDialinConnectorKey(dialinSNI)
if err != nil {
srvlog.Info(
"No dialins",
"error", err,
"dialinAttempt", dialinAttempt,
)
// Lookup peerCache to fetch cluster connection
// On cache-miss send the probe, wait and retry 5 times
relayIP, found := peerclient.GetPeerCache(utils.PeerCache, dialinSNI)
if found {
// forward the client request to peer upstream
r.Header.Set("X-Paralus-User", paralusUserName)
r.Header.Set("X-Paralus-Cluster-ServerName", r.TLS.ServerName)
r.Header.Set("X-Paralus-Cluster-ID", clusterID)
r.Header.Del("X-Paralus-Audit")
srv.ProcessPeerForwards(w, r, lg, relayIP, certIssue)
return
} else {
if dialinAttempt == 0 {
go SendPeerProbe(PeerProbeChanel, dialinSNI)
}
dialinAttempt++
if dialinAttempt > 7 {
errStirng := "ERROR: failed to forward request to cluster. Please retry"
jsonError(w, errStirng, "failed to find connection", http.StatusInternalServerError)
return
}
// wait for total ~20 sec to learn from core
// else drop the connection
time.Sleep(3 * time.Second)
goto retryDialin
}
} else {
//cache it
session.DialinCachedKey = key
}
} else {
//verify cache is valid
if !dsrv.DialinPool.CheckDialinKeyExist(session.DialinCachedKey) {
session.DialinCachedKey = ""
goto retryDialin
}
}
srvlog.Debug(
"dialin connection lookup",
"key", session.DialinCachedKey,
"sessionKey", sessionKey,
)
//unix socket for stiching user request to dialin
socketPath := utils.UNIXSOCKET + srv.DialinServerName
if session.UserName == "" {
userName, roleName, isRead, isOrgAdmin, enforceOrgAdminSecret, err := srv.Provisioner.ProvisionAuthzForUser(socketPath, paralusUserName, r.TLS.ServerName, session.DialinCachedKey, session.ErrorFlag, false, certIssue)
if err != nil {
var errStirng string
srvlog.Error(
err,
"unable to provision authz for user",
)
if userName == "" {
errStirng = "ERROR: Unauthenticated access not allowed. Please log in to the portal via browser, or set up API key, for access via the secure kubectl proxy. Error:" + err.Error()
} else {
errStirng = "ERROR: Connection timed-out. Unable to provision cluster RBAC. Please retry."
}
jsonError(w, errStirng, "unable to proxy kubectl service", http.StatusUnauthorized)
session.DialinCachedKey = ""
sessions.DeleteUserSession(sessionKey)
return
}
session.UserName = userName
session.IsReadrole = isRead
session.RoleName = roleName
session.IsOrgAdmin = isOrgAdmin
session.EnforceOrgAdminOnlySecret = enforceOrgAdminSecret
} else {
go func() {
_, roleName, isRead, isOrgAdmin, enforceOrgAdminSecret, err := srv.Provisioner.ProvisionAuthzForUser(socketPath, paralusUserName, r.TLS.ServerName, session.DialinCachedKey, session.ErrorFlag, true, certIssue)
if err != nil {
srvlog.Error(
err,
"unable to provision authz for user",
)
session.UserName = ""
}
session.IsReadrole = isRead
session.RoleName = roleName
session.IsOrgAdmin = isOrgAdmin
session.EnforceOrgAdminOnlySecret = enforceOrgAdminSecret
}()
}
//check readrole vs pod exec
if session.IsReadrole {
if sessions.GetRoleCheck(r.Method, r.URL.Path) {
errStirng := fmt.Sprintf("ERROR: request forbidden for the role %s.", session.RoleName)
jsonError(w, errStirng, "unable to authorize user request", http.StatusUnauthorized)
return
}
}
if session.EnforceOrgAdminOnlySecret && !session.IsOrgAdmin {
if sessions.GetSecretRoleCheck(r.Method, r.URL.Path) {
errStirng := "ERROR: request for secret resource is forbidden. Contact your organization admin"
jsonError(w, errStirng, "unable to authorize user request to secret", http.StatusUnauthorized)
return
}
}
//setsup the upgradeaware unix handler
unixHandler, err := proxy.UnixKubeHandler(socketPath, session.DialinCachedKey, paralusUserName, r.TLS.ServerName)
if err != nil {
srvlog.Error(
err,
"unable to create unix handler",
)
errStirng := "ERROR: failed to forward request to cluster. Please retry"
jsonError(w, errStirng, "unable to create forward handler", http.StatusInternalServerError)
return
}
//These are the headers used by relay-agent to fetch
//user information.
r.Header.Set("X-Paralus-User", session.UserName)
r.Header.Set("X-Paralus-Key", session.DialinCachedKey)
r.Header.Set("X-Paralus-Namespace", "paralus-system")
r.Header.Set("X-Paralus-Sessionkey", sessionKey)
utils.SetXForwardedFor(r.Header, r.RemoteAddr)
utils.SetXRAYUUID(r.Header)
if session.ErrorFlag {
r.Header.Set(utils.HeaderClearSecret, "true")
}
//upgradeaware uinix upstreaming
unixHandler.ServeHTTP(w, r)
srvlog.Debug(
"done Serving unixHandler.ServeHTTP ",
)
if session.ErrorFlag {
session.DialinCachedKey = ""
sessions.DeleteUserSession(sessionKey)
}
}
}
func jsonError(w http.ResponseWriter, message, reason string, code int) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.WriteHeader(code)
resp := &kubeError{Kind: "Status", APIVersion: "v1", Metadata: nil, Status: "Failure", Message: message, Reason: reason, Code: code}
e, err := json.Marshal(resp)
if err == nil {
fmt.Fprintln(w, string(e))
return
}
fmt.Fprintln(w, message+" "+reason)
}
// ServeHTTP requests from userfacing connection
func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
servelog := slog.WithName("RelayServeHTTP")
servelog.Debug(
"start serving user http",
)
if len(r.TLS.PeerCertificates) <= 0 {
servelog.Error(
nil,
"no client certificate in request",
)
errStirng := "ERROR: Unauthenticated access not allowed. Please log in to the portal and download new kubeconfig"
jsonError(w, errStirng, "invalid cert in kubeconfig", http.StatusUnauthorized)
return
}
//client certificate
servelog.Debug(
"describe client certificate",
"ServerName", r.TLS.ServerName,
"Peer CN", r.TLS.PeerCertificates[0].Subject.CommonName,
"Peer Serial", r.TLS.PeerCertificates[0].Subject.SerialNumber,
"NegotiatedProtocol", r.TLS.NegotiatedProtocol,
"NegotiatedProtocolIsMutual", r.TLS.NegotiatedProtocolIsMutual,
)
switch srv.Type {
case utils.RELAY:
srv.ProcessRelayRequest(w, r, servelog)
default:
servelog.Error(
nil,
"unexpected server type",
"ServerName", srv.ServerName,
"type", srv.Type,
)
}
}
// AddToDialinPool add connection to dialin pool of the server
func (srv *Server) AddToDialinPool(rconn *RelayConn, remoteAddr string) (string, error) {
slog.Info(
"AddToDialinPool",
"identifier", rconn.PeerID,
"ServerName", rconn.ServerName,
"CertSNI", rconn.CertSNI,
)
key, err := srv.DialinPool.AddConn(rconn.Conn, rconn.PeerID, rconn.CertSNI, remoteAddr)
if err != nil {
slog.Error(
err,
"adding connection failed",
"server", srv.ServerName,
)
return "", err
}
slog.Info(
"Added conn to pool of",
"server", srv.ServerName,
)
return key, nil
}
func getSNIMuxDebugString(tmp []byte) string {
dstr := ""
for i := range tmp {
if i >= len(tmp) {
break
}
b := tmp[i]
if b < 32 || b > 126 {
dstr = dstr + " . "
} else {
dstr = dstr + " " + string(b)
}
}
return dstr
}
// StartHTTPSListen start TLS listen on address
// Both user & dialin endpoint listen on 443
// Based on SNI traffic is routed/muxed to appropriate handler
func (sl *ServerListen) StartHTTPSListen(ctx context.Context) {
slistenlog := slog.WithName("Listener")
slistenlog.Info(
"starting listener",
"addr", sl.Addr,
"protocol", sl.Protocol,
"num-servers", len(sl.ServerList),
)
l, err := net.Listen("tcp", sl.Addr)
if err != nil {
slistenlog.Error(
err,
"failed to listen",
"addr", sl.Addr,
)
return
}
//close the listener when ctx is done
go func() {
defer l.Close()
<-ctx.Done()
slistenlog.Info(
"stopping listener",
"address", sl.Addr,
)
}()
sl.Mux, err = vhost.NewTLSMuxer(l, utils.DefaultMuxTimeout)
if err != nil {
slistenlog.Error(
err,
"failed in NewTLSMuxer",
)
return
}
for name, srv := range Servers {
slistenlog.Info(
"start mux listen on ",
"sni", name,
)
snil, err := sl.Mux.Listen(name)
if err != nil {
slistenlog.Error(
err,
"failed in sl.Mux.Listen",
"sni", name,
)
return
}
//listen routine for sni (name)
go srv.sniListen(ctx, name, snil, sl)
if srv.Type == utils.DIALIN && utils.Mode != utils.CDRELAY {
//start the unix socket listen for each
//dialin server block
go srv.startUnixListen(ctx, slistenlog)
}
}
// custom error handler for the mux
go func() {
for {
conn, err := sl.Mux.NextError()
vhostName := ""
tlsConn, ok := conn.(*vhost.TLSConn)
dbgStr := ""
if conn != nil {
tmp := make([]byte, 256)
n, _ := conn.Read(tmp)
if n > 0 {
dbgStr = getSNIMuxDebugString(tmp)
}
}
if ok {
vhostName = tlsConn.Host()
slistenlog.Error(
nil,
"vhostName", vhostName,