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more work on websocket support

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This commit is contained in:
Shivaram Lingamneni 2020-05-04 22:29:10 -04:00
parent 25813f6d3a
commit 3dc5c8de78
17 changed files with 830 additions and 444 deletions
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16
conventional.yaml
View File

@ -40,9 +40,12 @@ server:
# "/hidden_service_sockets/oragono_tor_sock": # "/hidden_service_sockets/oragono_tor_sock":
# tor: true # tor: true
# Example of a WebSocket listener. # Example of a WebSocket listener:
#"127.0.0.1:8080": # ":4430":
# websocket: true # websocket: true
# tls:
# key: tls.key
# cert: tls.crt
# sets the permissions for Unix listen sockets. on a typical Linux system, # sets the permissions for Unix listen sockets. on a typical Linux system,
# the default is 0775 or 0755, which prevents other users/groups from connecting # the default is 0775 or 0755, which prevents other users/groups from connecting
@ -85,6 +88,15 @@ server:
# should clients include this STS policy when they ship their inbuilt preload lists? # should clients include this STS policy when they ship their inbuilt preload lists?
preload: false preload: false
websockets:
# sets the Origin headers that will be accepted for websocket connections.
# an empty list means any value (or no value) is allowed. the main use of this
# is to prevent malicious third-party Javascript from co-opting non-malicious
# clients (i.e., mainstream browsers) to DDoS your server.
allowed-origins:
# - "https://oragono.io"
# - "https://*.oragono.io"
# casemapping controls what kinds of strings are permitted as identifiers (nicknames, # casemapping controls what kinds of strings are permitted as identifiers (nicknames,
# channel names, account names, etc.), and how they are normalized for case. # channel names, account names, etc.), and how they are normalized for case.
# with the recommended default of 'precis', utf-8 identifiers that are "sane" # with the recommended default of 'precis', utf-8 identifiers that are "sane"

81
irc/client.go
View File

@ -254,26 +254,31 @@ type ClientDetails struct {
} }
// RunClient sets up a new client and runs its goroutine. // RunClient sets up a new client and runs its goroutine.
func (server *Server) RunClient(conn clientConn, proxyLine string) { func (server *Server) RunClient(conn IRCConn) {
proxiedConn := conn.UnderlyingConn()
var isBanned bool var isBanned bool
var banMsg string var banMsg string
var realIP net.IP realIP := utils.AddrToIP(proxiedConn.RemoteAddr())
if conn.Config.Tor { var proxiedIP net.IP
realIP = utils.IPv4LoopbackAddress if proxiedConn.Config.Tor {
// cover up details of the tor proxying infrastructure (not a user privacy concern,
// but a hardening measure):
proxiedIP = utils.IPv4LoopbackAddress
isBanned, banMsg = server.checkTorLimits() isBanned, banMsg = server.checkTorLimits()
} else { } else {
realIP = utils.AddrToIP(conn.Conn.RemoteAddr()) ipToCheck := realIP
// skip the ban check for k8s-style proxy-before-TLS if proxiedConn.ProxiedIP != nil {
if proxyLine == "" { proxiedIP = proxiedConn.ProxiedIP
isBanned, banMsg = server.checkBans(realIP) ipToCheck = proxiedIP
} }
isBanned, banMsg = server.checkBans(ipToCheck)
} }
if isBanned { if isBanned {
// this might not show up properly on some clients, // this might not show up properly on some clients,
// but our objective here is just to close the connection out before it has a load impact on us // but our objective here is just to close the connection out before it has a load impact on us
conn.Conn.Write([]byte(fmt.Sprintf(errorMsg, banMsg))) conn.Write([]byte(fmt.Sprintf(errorMsg, banMsg)))
conn.Conn.Close() conn.Close()
return return
} }
@ -282,13 +287,13 @@ func (server *Server) RunClient(conn clientConn, proxyLine string) {
now := time.Now().UTC() now := time.Now().UTC()
config := server.Config() config := server.Config()
// give them 1k of grace over the limit: // give them 1k of grace over the limit:
socket := NewSocket(conn.Conn, ircmsg.MaxlenTagsFromClient+512+1024, config.Server.MaxSendQBytes) socket := NewSocket(conn, config.Server.MaxSendQBytes)
client := &Client{ client := &Client{
lastSeen: now, lastSeen: now,
lastActive: now, lastActive: now,
channels: make(ChannelSet), channels: make(ChannelSet),
ctime: now, ctime: now,
isSTSOnly: conn.Config.STSOnly, isSTSOnly: proxiedConn.Config.STSOnly,
languages: server.Languages().Default(), languages: server.Languages().Default(),
loginThrottle: connection_limits.GenericThrottle{ loginThrottle: connection_limits.GenericThrottle{
Duration: config.Accounts.LoginThrottling.Duration, Duration: config.Accounts.LoginThrottling.Duration,
@ -299,6 +304,8 @@ func (server *Server) RunClient(conn clientConn, proxyLine string) {
nick: "*", // * is used until actual nick is given nick: "*", // * is used until actual nick is given
nickCasefolded: "*", nickCasefolded: "*",
nickMaskString: "*", // * is used until actual nick is given nickMaskString: "*", // * is used until actual nick is given
realIP: realIP,
proxiedIP: proxiedIP,
} }
client.writerSemaphore.Initialize(1) client.writerSemaphore.Initialize(1)
client.history.Initialize(config.History.ClientLength, config.History.AutoresizeWindow) client.history.Initialize(config.History.ClientLength, config.History.AutoresizeWindow)
@ -311,7 +318,8 @@ func (server *Server) RunClient(conn clientConn, proxyLine string) {
ctime: now, ctime: now,
lastActive: now, lastActive: now,
realIP: realIP, realIP: realIP,
isTor: conn.Config.Tor, proxiedIP: proxiedIP,
isTor: proxiedConn.Config.Tor,
} }
client.sessions = []*Session{session} client.sessions = []*Session{session}
@ -322,34 +330,28 @@ func (server *Server) RunClient(conn clientConn, proxyLine string) {
client.SetMode(defaultMode, true) client.SetMode(defaultMode, true)
} }
if conn.Config.TLSConfig != nil { if proxiedConn.Config.TLSConfig != nil {
client.SetMode(modes.TLS, true) client.SetMode(modes.TLS, true)
// error is not useful to us here anyways so we can ignore it // error is not useful to us here anyways so we can ignore it
session.certfp, _ = socket.CertFP() session.certfp, _ = utils.GetCertFP(proxiedConn.Conn, RegisterTimeout)
} }
if conn.Config.Tor { if session.isTor {
client.SetMode(modes.TLS, true) client.SetMode(modes.TLS, true)
// cover up details of the tor proxying infrastructure (not a user privacy concern,
// but a hardening measure):
session.proxiedIP = utils.IPv4LoopbackAddress
client.proxiedIP = session.proxiedIP
session.rawHostname = config.Server.TorListeners.Vhost session.rawHostname = config.Server.TorListeners.Vhost
client.rawHostname = session.rawHostname client.rawHostname = session.rawHostname
} else { } else {
remoteAddr := conn.Conn.RemoteAddr()
if realIP.IsLoopback() || utils.IPInNets(realIP, config.Server.secureNets) { if realIP.IsLoopback() || utils.IPInNets(realIP, config.Server.secureNets) {
// treat local connections as secure (may be overridden later by WEBIRC) // treat local connections as secure (may be overridden later by WEBIRC)
client.SetMode(modes.TLS, true) client.SetMode(modes.TLS, true)
} }
if config.Server.CheckIdent && !utils.AddrIsUnix(remoteAddr) { if config.Server.CheckIdent {
client.doIdentLookup(conn.Conn) client.doIdentLookup(proxiedConn.Conn)
} }
} }
client.realIP = session.realIP
server.stats.Add() server.stats.Add()
client.run(session, proxyLine) client.run(session)
} }
func (server *Server) AddAlwaysOnClient(account ClientAccount, chnames []string, lastSeen time.Time) { func (server *Server) AddAlwaysOnClient(account ClientAccount, chnames []string, lastSeen time.Time) {
@ -476,21 +478,19 @@ func (client *Client) lookupHostname(session *Session, overwrite bool) {
} }
func (client *Client) doIdentLookup(conn net.Conn) { func (client *Client) doIdentLookup(conn net.Conn) {
_, serverPortString, err := net.SplitHostPort(conn.LocalAddr().String()) localTCPAddr, ok := conn.LocalAddr().(*net.TCPAddr)
if err != nil { if !ok {
client.server.logger.Error("internal", "bad server address", err.Error())
return return
} }
serverPort, _ := strconv.Atoi(serverPortString) serverPort := localTCPAddr.Port
clientHost, clientPortString, err := net.SplitHostPort(conn.RemoteAddr().String()) remoteTCPAddr, ok := conn.RemoteAddr().(*net.TCPAddr)
if err != nil { if !ok {
client.server.logger.Error("internal", "bad client address", err.Error())
return return
} }
clientPort, _ := strconv.Atoi(clientPortString) clientPort := remoteTCPAddr.Port
client.Notice(client.t("*** Looking up your username")) client.Notice(client.t("*** Looking up your username"))
resp, err := ident.Query(clientHost, serverPort, clientPort, IdentTimeoutSeconds) resp, err := ident.Query(remoteTCPAddr.IP.String(), serverPort, clientPort, IdentTimeoutSeconds)
if err == nil { if err == nil {
err := client.SetNames(resp.Identifier, "", true) err := client.SetNames(resp.Identifier, "", true)
if err == nil { if err == nil {
@ -567,7 +567,7 @@ func (client *Client) t(originalString string) string {
// main client goroutine: read lines and execute the corresponding commands // main client goroutine: read lines and execute the corresponding commands
// `proxyLine` is the PROXY-before-TLS line, if there was one // `proxyLine` is the PROXY-before-TLS line, if there was one
func (client *Client) run(session *Session, proxyLine string) { func (client *Client) run(session *Session) {
defer func() { defer func() {
if r := recover(); r != nil { if r := recover(); r != nil {
@ -601,14 +601,7 @@ func (client *Client) run(session *Session, proxyLine string) {
firstLine := !isReattach firstLine := !isReattach
for { for {
var line string line, err := session.socket.Read()
var err error
if proxyLine == "" {
line, err = session.socket.Read()
} else {
line = proxyLine // pretend we're just now receiving the proxy-before-TLS line
proxyLine = ""
}
if err != nil { if err != nil {
quitMessage := "connection closed" quitMessage := "connection closed"
if err == errReadQ { if err == errReadQ {
@ -681,7 +674,7 @@ func (client *Client) run(session *Session, proxyLine string) {
break break
} else if session.client != client { } else if session.client != client {
// bouncer reattach // bouncer reattach
go session.client.run(session, "") go session.client.run(session)
break break
} }
} }

42
irc/config.go
View File

@ -56,16 +56,6 @@ type listenerConfigBlock struct {
WebSocket bool WebSocket bool
} }
// listenerConfig is the config governing a particular listener (bound address),
// in particular whether it has TLS or Tor (or both) enabled.
type listenerConfig struct {
TLSConfig *tls.Config
Tor bool
STSOnly bool
ProxyBeforeTLS bool
WebSocket bool
}
type PersistentStatus uint type PersistentStatus uint
const ( const (
@ -488,8 +478,12 @@ type Config struct {
Listeners map[string]listenerConfigBlock Listeners map[string]listenerConfigBlock
UnixBindMode os.FileMode `yaml:"unix-bind-mode"` UnixBindMode os.FileMode `yaml:"unix-bind-mode"`
TorListeners TorListenersConfig `yaml:"tor-listeners"` TorListeners TorListenersConfig `yaml:"tor-listeners"`
Websockets struct {
AllowedOrigins []string `yaml:"allowed-origins"`
allowedOriginRegexps []*regexp.Regexp
}
// they get parsed into this internal representation: // they get parsed into this internal representation:
trueListeners map[string]listenerConfig trueListeners map[string]utils.ListenerConfig
STS STSConfig STS STSConfig
LookupHostnames *bool `yaml:"lookup-hostnames"` LookupHostnames *bool `yaml:"lookup-hostnames"`
lookupHostnames bool lookupHostnames bool
@ -767,9 +761,10 @@ func (conf *Config) prepareListeners() (err error) {
return fmt.Errorf("No listeners were configured") return fmt.Errorf("No listeners were configured")
} }
conf.Server.trueListeners = make(map[string]listenerConfig) conf.Server.trueListeners = make(map[string]utils.ListenerConfig)
for addr, block := range conf.Server.Listeners { for addr, block := range conf.Server.Listeners {
var lconf listenerConfig var lconf utils.ListenerConfig
lconf.ProxyDeadline = time.Minute
lconf.Tor = block.Tor lconf.Tor = block.Tor
lconf.STSOnly = block.STSOnly lconf.STSOnly = block.STSOnly
if lconf.STSOnly && !conf.Server.STS.Enabled { if lconf.STSOnly && !conf.Server.STS.Enabled {
@ -781,7 +776,7 @@ func (conf *Config) prepareListeners() (err error) {
return err return err
} }
lconf.TLSConfig = tlsConfig lconf.TLSConfig = tlsConfig
lconf.ProxyBeforeTLS = block.TLS.Proxy lconf.RequireProxy = block.TLS.Proxy
} }
lconf.WebSocket = block.WebSocket lconf.WebSocket = block.WebSocket
conf.Server.trueListeners[addr] = lconf conf.Server.trueListeners[addr] = lconf
@ -849,6 +844,14 @@ func LoadConfig(filename string) (config *Config, err error) {
return nil, fmt.Errorf("failed to prepare listeners: %v", err) return nil, fmt.Errorf("failed to prepare listeners: %v", err)
} }
for _, glob := range config.Server.Websockets.AllowedOrigins {
globre, err := utils.CompileGlob(glob)
if err != nil {
return nil, fmt.Errorf("invalid websocket allowed-origin expression: %s", glob)
}
config.Server.Websockets.allowedOriginRegexps = append(config.Server.Websockets.allowedOriginRegexps, globre)
}
if config.Server.STS.Enabled { if config.Server.STS.Enabled {
if config.Server.STS.Port < 0 || config.Server.STS.Port > 65535 { if config.Server.STS.Port < 0 || config.Server.STS.Port > 65535 {
return nil, fmt.Errorf("STS port is incorrect, should be 0 if disabled: %d", config.Server.STS.Port) return nil, fmt.Errorf("STS port is incorrect, should be 0 if disabled: %d", config.Server.STS.Port)
@ -1206,6 +1209,11 @@ func (config *Config) Diff(oldConfig *Config) (addedCaps, removedCaps *caps.Set)
} }
func compileGuestRegexp(guestFormat string, casemapping Casemapping) (standard, folded *regexp.Regexp, err error) { func compileGuestRegexp(guestFormat string, casemapping Casemapping) (standard, folded *regexp.Regexp, err error) {
standard, err = utils.CompileGlob(guestFormat)
if err != nil {
return
}
starIndex := strings.IndexByte(guestFormat, '*') starIndex := strings.IndexByte(guestFormat, '*')
if starIndex == -1 { if starIndex == -1 {
return nil, nil, errors.New("guest format must contain exactly one *") return nil, nil, errors.New("guest format must contain exactly one *")
@ -1215,10 +1223,6 @@ func compileGuestRegexp(guestFormat string, casemapping Casemapping) (standard,
if strings.IndexByte(final, '*') != -1 { if strings.IndexByte(final, '*') != -1 {
return nil, nil, errors.New("guest format must contain exactly one *") return nil, nil, errors.New("guest format must contain exactly one *")
} }
standard, err = regexp.Compile(fmt.Sprintf("^%s(.*)%s$", initial, final))
if err != nil {
return
}
initialFolded, err := casefoldWithSetting(initial, casemapping) initialFolded, err := casefoldWithSetting(initial, casemapping)
if err != nil { if err != nil {
return return
@ -1227,6 +1231,6 @@ func compileGuestRegexp(guestFormat string, casemapping Casemapping) (standard,
if err != nil { if err != nil {
return return
} }
folded, err = regexp.Compile(fmt.Sprintf("^%s(.*)%s$", initialFolded, finalFolded)) folded, err = utils.CompileGlob(fmt.Sprintf("%s*%s", initialFolded, finalFolded))
return return
} }

60
irc/gateways.go
View File

@ -7,10 +7,7 @@ package irc
import ( import (
"errors" "errors"
"fmt"
"net" "net"
"strings"
"time"
"github.com/oragono/oragono/irc/modes" "github.com/oragono/oragono/irc/modes"
"github.com/oragono/oragono/irc/utils" "github.com/oragono/oragono/irc/utils"
@ -58,7 +55,7 @@ func (wc *webircConfig) Populate() (err error) {
} }
// ApplyProxiedIP applies the given IP to the client. // ApplyProxiedIP applies the given IP to the client.
func (client *Client) ApplyProxiedIP(session *Session, proxiedIP string, tls bool) (err error, quitMsg string) { func (client *Client) ApplyProxiedIP(session *Session, proxiedIP net.IP, tls bool) (err error, quitMsg string) {
// PROXY and WEBIRC are never accepted from a Tor listener, even if the address itself // PROXY and WEBIRC are never accepted from a Tor listener, even if the address itself
// is whitelisted: // is whitelisted:
if session.isTor { if session.isTor {
@ -66,12 +63,12 @@ func (client *Client) ApplyProxiedIP(session *Session, proxiedIP string, tls boo
} }
// ensure IP is sane // ensure IP is sane
parsedProxiedIP := net.ParseIP(proxiedIP).To16() if proxiedIP == nil {
if parsedProxiedIP == nil { return errBadProxyLine, "proxied IP is not valid"
return errBadProxyLine, fmt.Sprintf(client.t("Proxied IP address is not valid: [%s]"), proxiedIP)
} }
proxiedIP = proxiedIP.To16()
isBanned, banMsg := client.server.checkBans(parsedProxiedIP) isBanned, banMsg := client.server.checkBans(proxiedIP)
if isBanned { if isBanned {
return errBanned, banMsg return errBanned, banMsg
} }
@ -80,12 +77,12 @@ func (client *Client) ApplyProxiedIP(session *Session, proxiedIP string, tls boo
client.server.connectionLimiter.RemoveClient(session.realIP) client.server.connectionLimiter.RemoveClient(session.realIP)
// given IP is sane! override the client's current IP // given IP is sane! override the client's current IP
client.server.logger.Info("connect-ip", "Accepted proxy IP for client", parsedProxiedIP.String()) client.server.logger.Info("connect-ip", "Accepted proxy IP for client", proxiedIP.String())
client.stateMutex.Lock() client.stateMutex.Lock()
defer client.stateMutex.Unlock() defer client.stateMutex.Unlock()
client.proxiedIP = parsedProxiedIP client.proxiedIP = proxiedIP
session.proxiedIP = parsedProxiedIP session.proxiedIP = proxiedIP
// nickmask will be updated when the client completes registration // nickmask will be updated when the client completes registration
// set tls info // set tls info
session.certfp = "" session.certfp = ""
@ -110,50 +107,17 @@ func handleProxyCommand(server *Server, client *Client, session *Session, line s
} }
}() }()
params := strings.Fields(line) ip, err := utils.ParseProxyLine(line)
if len(params) != 6 { if err != nil {
return errBadProxyLine return err
} }
if utils.IPInNets(client.realIP, server.Config().Server.proxyAllowedFromNets) { if utils.IPInNets(client.realIP, server.Config().Server.proxyAllowedFromNets) {
// assume PROXY connections are always secure // assume PROXY connections are always secure
err, quitMsg = client.ApplyProxiedIP(session, params[2], true) err, quitMsg = client.ApplyProxiedIP(session, ip, true)
return return
} else { } else {
// real source IP is not authorized to issue PROXY: // real source IP is not authorized to issue PROXY:
return errBadGatewayAddress return errBadGatewayAddress
} }
} }
// read a PROXY line one byte at a time, to ensure we don't read anything beyond
// that into a buffer, which would break the TLS handshake
func readRawProxyLine(conn net.Conn) (result string) {
// normally this is covered by ping timeouts, but we're doing this outside
// of the normal client goroutine:
conn.SetDeadline(time.Now().Add(time.Minute))
defer conn.SetDeadline(time.Time{})
var buf [maxProxyLineLen]byte
oneByte := make([]byte, 1)
i := 0
for i < maxProxyLineLen {
n, err := conn.Read(oneByte)
if err != nil {
return
} else if n == 1 {
buf[i] = oneByte[0]
if buf[i] == '\n' {
candidate := string(buf[0 : i+1])
if strings.HasPrefix(candidate, "PROXY") {
return candidate
} else {
return
}
}
i += 1
}
}
// no \r\n, fail out
return
}

3
irc/handlers.go
View File

@ -10,6 +10,7 @@ import (
"bytes" "bytes"
"encoding/base64" "encoding/base64"
"fmt" "fmt"
"net"
"os" "os"
"runtime" "runtime"
"runtime/debug" "runtime/debug"
@ -2581,7 +2582,7 @@ func webircHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Re
continue continue
} }
err, quitMsg := client.ApplyProxiedIP(rb.session, msg.Params[3], secure) err, quitMsg := client.ApplyProxiedIP(rb.session, net.ParseIP(msg.Params[3]), secure)
if err != nil { if err != nil {
client.Quit(quitMsg, rb.session) client.Quit(quitMsg, rb.session)
return true return true

136
irc/ircconn.go Normal file
View File

@ -0,0 +1,136 @@
package irc
import (
"bufio"
"bytes"
"net"
"unicode/utf8"
"github.com/gorilla/websocket"
"github.com/goshuirc/irc-go/ircmsg"
"github.com/oragono/oragono/irc/utils"
)
const (
maxReadQBytes = ircmsg.MaxlenTagsFromClient + 512 + 1024
)
var (
crlf = []byte{'\r', '\n'}
)
// IRCConn abstracts away the distinction between a regular
// net.Conn (which includes both raw TCP and TLS) and a websocket.
// it doesn't expose Read and Write because websockets are message-oriented,
// not stream-oriented.
type IRCConn interface {
UnderlyingConn() *utils.ProxiedConnection
Write([]byte) error
WriteBuffers([][]byte) error
ReadLine() (line []byte, err error)
Close() error
}
// IRCStreamConn is an IRCConn over a regular stream connection.
type IRCStreamConn struct {
conn *utils.ProxiedConnection
reader *bufio.Reader
}
func NewIRCStreamConn(conn *utils.ProxiedConnection) *IRCStreamConn {
return &IRCStreamConn{
conn: conn,
}
}
func (cc *IRCStreamConn) UnderlyingConn() *utils.ProxiedConnection {
return cc.conn
}
func (cc *IRCStreamConn) Write(buf []byte) (err error) {
_, err = cc.conn.Write(buf)
return
}
func (cc *IRCStreamConn) WriteBuffers(buffers [][]byte) (err error) {
// on Linux, with a plaintext TCP or Unix domain socket,
// the Go runtime will optimize this into a single writev(2) call:
_, err = (*net.Buffers)(&buffers).WriteTo(cc.conn)
return
}
func (cc *IRCStreamConn) ReadLine() (line []byte, err error) {
// lazy initialize the reader in case the IP is banned
if cc.reader == nil {
cc.reader = bufio.NewReaderSize(cc.conn, maxReadQBytes)
}
var isPrefix bool
line, isPrefix, err = cc.reader.ReadLine()
if isPrefix {
return nil, errReadQ
}
line = bytes.TrimSuffix(line, crlf)
return
}
func (cc *IRCStreamConn) Close() (err error) {
return cc.conn.Close()
}
// IRCWSConn is an IRCConn over a websocket.
type IRCWSConn struct {
conn *websocket.Conn
}
func NewIRCWSConn(conn *websocket.Conn) IRCWSConn {
return IRCWSConn{conn: conn}
}
func (wc IRCWSConn) UnderlyingConn() *utils.ProxiedConnection {
pConn, ok := wc.conn.UnderlyingConn().(*utils.ProxiedConnection)
if ok {
return pConn
} else {
// this can't happen
return nil
}
}
func (wc IRCWSConn) Write(buf []byte) (err error) {
buf = bytes.TrimSuffix(buf, crlf)
// there's not much we can do about this;
// silently drop the message
if !utf8.Valid(buf) {
return nil
}
return wc.conn.WriteMessage(websocket.TextMessage, buf)
}
func (wc IRCWSConn) WriteBuffers(buffers [][]byte) (err error) {
for _, buf := range buffers {
err = wc.Write(buf)
if err != nil {
return
}
}
return
}
func (wc IRCWSConn) ReadLine() (line []byte, err error) {
for {
var messageType int
messageType, line, err = wc.conn.ReadMessage()
// on empty message or non-text message, try again, block if necessary
if err != nil || (messageType == websocket.TextMessage && len(line) != 0) {
return
}
}
}
func (wc IRCWSConn) Close() (err error) {
return wc.conn.Close()
}

209
irc/listeners.go Normal file
View File

@ -0,0 +1,209 @@
// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
// released under the MIT license
package irc
import (
"errors"
"net"
"net/http"
"os"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/oragono/oragono/irc/utils"
)
var (
errCantReloadListener = errors.New("can't switch a listener between stream and websocket")
)
// IRCListener is an abstract wrapper for a listener (TCP port or unix domain socket).
// Server tracks these by listen address and can reload or stop them during rehash.
type IRCListener interface {
Reload(config utils.ListenerConfig) error
Stop() error
}
// NewListener creates a new listener according to the specifications in the config file
func NewListener(server *Server, addr string, config utils.ListenerConfig, bindMode os.FileMode) (result IRCListener, err error) {
baseListener, err := createBaseListener(addr, bindMode)
if err != nil {
return
}
wrappedListener := utils.NewReloadableListener(baseListener, config)
if config.WebSocket {
return NewWSListener(server, addr, wrappedListener, config)
} else {
return NewNetListener(server, addr, wrappedListener, config)
}
}
func createBaseListener(addr string, bindMode os.FileMode) (listener net.Listener, err error) {
addr = strings.TrimPrefix(addr, "unix:")
if strings.HasPrefix(addr, "/") {
// https://stackoverflow.com/a/34881585
os.Remove(addr)
listener, err = net.Listen("unix", addr)
if err == nil && bindMode != 0 {
os.Chmod(addr, bindMode)
}
} else {
listener, err = net.Listen("tcp", addr)
}
return
}
// NetListener is an IRCListener for a regular stream socket (TCP or unix domain)
type NetListener struct {
listener *utils.ReloadableListener
server *Server
addr string
}
func NewNetListener(server *Server, addr string, listener *utils.ReloadableListener, config utils.ListenerConfig) (result *NetListener, err error) {
nl := NetListener{
server: server,
listener: listener,
addr: addr,
}
go nl.serve()
return &nl, nil
}
func (nl *NetListener) Reload(config utils.ListenerConfig) error {
if config.WebSocket {
return errCantReloadListener
}
nl.listener.Reload(config)
return nil
}
func (nl *NetListener) Stop() error {
return nl.listener.Close()
}
// ensure that any IP we got from the PROXY line is trustworthy (otherwise, clear it)
func validateProxiedIP(conn *utils.ProxiedConnection, config *Config) {
if !utils.IPInNets(utils.AddrToIP(conn.RemoteAddr()), config.Server.proxyAllowedFromNets) {
conn.ProxiedIP = nil
}
}
func (nl *NetListener) serve() {
for {
conn, err := nl.listener.Accept()
if err == nil {
// hand off the connection
pConn, ok := conn.(*utils.ProxiedConnection)
if ok {
if pConn.ProxiedIP != nil {
validateProxiedIP(pConn, nl.server.Config())
}
go nl.server.RunClient(NewIRCStreamConn(pConn))
} else {
nl.server.logger.Error("internal", "invalid connection type", nl.addr)
}
} else if err == utils.ErrNetClosing {
return
} else {
nl.server.logger.Error("internal", "accept error", nl.addr, err.Error())
}
}
}
// WSListener is a listener for IRC-over-websockets (initially HTTP, then upgraded to a
// different application protocol that provides a message-based API, possibly with TLS)
type WSListener struct {
sync.Mutex // tier 1
listener *utils.ReloadableListener
httpServer *http.Server
server *Server
addr string
config utils.ListenerConfig
}
func NewWSListener(server *Server, addr string, listener *utils.ReloadableListener, config utils.ListenerConfig) (result *WSListener, err error) {
result = &WSListener{
listener: listener,
server: server,
addr: addr,
config: config,
}
result.httpServer = &http.Server{
Handler: http.HandlerFunc(result.handle),
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
}
go result.httpServer.Serve(listener)
return
}
func (wl *WSListener) Reload(config utils.ListenerConfig) error {
if !config.WebSocket {
return errCantReloadListener
}
wl.listener.Reload(config)
return nil
}
func (wl *WSListener) Stop() error {
return wl.httpServer.Close()
}
func (wl *WSListener) handle(w http.ResponseWriter, r *http.Request) {
config := wl.server.Config()
proxyAllowedFrom := config.Server.proxyAllowedFromNets
proxiedIP := utils.HandleXForwardedFor(r.RemoteAddr, r.Header.Get("X-Forwarded-For"), proxyAllowedFrom)
wsUpgrader := websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
if len(config.Server.Websockets.allowedOriginRegexps) == 0 {
return true
}
origin := strings.TrimSpace(r.Header.Get("Origin"))
if len(origin) == 0 {
return false
}
for _, re := range config.Server.Websockets.allowedOriginRegexps {
if re.MatchString(origin) {
return true
}
}
return false
},
}
conn, err := wsUpgrader.Upgrade(w, r, nil)
if err != nil {
wl.server.logger.Info("internal", "websocket upgrade error", wl.addr, err.Error())
return
}
pConn, ok := conn.UnderlyingConn().(*utils.ProxiedConnection)
if !ok {
wl.server.logger.Error("internal", "non-proxied connection on websocket", wl.addr)
conn.Close()
return
}
if pConn.ProxiedIP != nil {
validateProxiedIP(pConn, config)
} else {
// if there was no PROXY protocol IP, use the validated X-Forwarded-For IP instead,
// unless it is redundant
if proxiedIP != nil && !proxiedIP.Equal(utils.AddrToIP(pConn.RemoteAddr())) {
pConn.ProxiedIP = proxiedIP
}
}
// avoid a DoS attack from buffering excessively large messages:
conn.SetReadLimit(maxReadQBytes)
go wl.server.RunClient(NewIRCWSConn(conn))
}

227
irc/server.go
View File

@ -7,7 +7,6 @@ package irc
import ( import (
"bufio" "bufio"
"crypto/tls"
"fmt" "fmt"
"net" "net"
"net/http" "net/http"
@ -53,17 +52,6 @@ var (
throttleMessage = "You have attempted to connect too many times within a short duration. Wait a while, and you will be able to connect." throttleMessage = "You have attempted to connect too many times within a short duration. Wait a while, and you will be able to connect."
) )
// ListenerWrapper wraps a listener so it can be safely reconfigured or stopped
type ListenerWrapper struct {
// protects atomic update of config and shouldStop:
sync.Mutex // tier 1
listener net.Listener
// optional WebSocket endpoint
httpServer *http.Server
config listenerConfig
shouldStop bool
}
// Server is the main Oragono server. // Server is the main Oragono server.
type Server struct { type Server struct {
accounts AccountManager accounts AccountManager
@ -77,7 +65,7 @@ type Server struct {
dlines *DLineManager dlines *DLineManager
helpIndexManager HelpIndexManager helpIndexManager HelpIndexManager
klines *KLineManager klines *KLineManager
listeners map[string]*ListenerWrapper listeners map[string]IRCListener
logger *logger.Manager logger *logger.Manager
monitorManager MonitorManager monitorManager MonitorManager
name string name string
@ -105,17 +93,12 @@ var (
} }
) )
type clientConn struct {
Conn net.Conn
Config listenerConfig
}
// NewServer returns a new Oragono server. // NewServer returns a new Oragono server.
func NewServer(config *Config, logger *logger.Manager) (*Server, error) { func NewServer(config *Config, logger *logger.Manager) (*Server, error) {
// initialize data structures // initialize data structures
server := &Server{ server := &Server{
ctime: time.Now().UTC(), ctime: time.Now().UTC(),
listeners: make(map[string]*ListenerWrapper), listeners: make(map[string]IRCListener),
logger: logger, logger: logger,
rehashSignal: make(chan os.Signal, 1), rehashSignal: make(chan os.Signal, 1),
signals: make(chan os.Signal, len(ServerExitSignals)), signals: make(chan os.Signal, len(ServerExitSignals)),
@ -223,176 +206,6 @@ func (server *Server) checkTorLimits() (banned bool, message string) {
} }
} }
//
// IRC protocol listeners
//
// createListener starts a given listener.
func (server *Server) createListener(addr string, conf listenerConfig, bindMode os.FileMode) (*ListenerWrapper, error) {
if conf.WebSocket {
return server.createWSListener(addr, conf)
}
return server.createNetListener(addr, conf, bindMode)
}
func (server *Server) isTrusted(ip string) bool {
netIP := net.ParseIP(ip)
return utils.IPInNets(netIP, server.Config().Server.proxyAllowedFromNets)
}
func (server *Server) followHTTPForwards(addr string, forwards string) string {
if !server.isTrusted(addr) {
return addr
}
forwardIPs := strings.Split(forwards, ",")
// Iterate backwards to have the inner-most proxy first.
for i := len(forwardIPs) - 1; i >= 0; i-- {
// Using i so that addr points to the last item after the end of the loop.
addr = forwardIPs[i]
if !server.isTrusted(addr) {
return addr
}
}
// All IPs are trusted? weird. Let's take the last one and call it a day.
return addr
}
// createWSListener starts a given WebSocket listener.
func (server *Server) createWSListener(addr string, conf listenerConfig) (*ListenerWrapper, error) {
var listener net.Listener
var err error
handler := func(w http.ResponseWriter, r *http.Request) {
remoteAddr := r.RemoteAddr
if header, ok := r.Header["X-Forwarded-For"]; ok {
remoteAddr = server.followHTTPForwards(remoteAddr, header[len(header)-1])
}
conn, err := wsUpgrader.Upgrade(w, r, nil)
if err != nil {
server.logger.Error("internal", "upgrade error", addr, err.Error())
return
}
newConn := clientConn{
Conn: WSContainer{conn},
Config: conf,
}
server.RunClient(newConn, "")
}
endpoint := http.Server{
Addr: addr,
Handler: http.HandlerFunc(handler),
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
if conf.TLSConfig != nil {
listener, err = tls.Listen("tcp", addr, conf.TLSConfig)
} else {
listener, err = net.Listen("tcp", addr)
}
if err != nil {
return nil, err
}
// throw our details to the server so we can be modified/killed later
wrapper := ListenerWrapper{
listener: listener,
httpServer: &endpoint,
config: conf,
shouldStop: false,
}
go func() {
err := endpoint.Serve(listener)
if err != nil {
server.logger.Error("internal", "Failed to start WebSocket listener on", addr)
}
}()
return &wrapper, nil
}
// createNetListener starts a given unix or TCP listener.
func (server *Server) createNetListener(addr string, conf listenerConfig, bindMode os.FileMode) (*ListenerWrapper, error) {
var listener net.Listener
var err error
addr = strings.TrimPrefix(addr, "unix:")
if strings.HasPrefix(addr, "/") {
// https://stackoverflow.com/a/34881585
os.Remove(addr)
listener, err = net.Listen("unix", addr)
if err == nil && bindMode != 0 {
os.Chmod(addr, bindMode)
}
} else {
listener, err = net.Listen("tcp", addr)
}
if err != nil {
return nil, err
}
// throw our details to the server so we can be modified/killed later
wrapper := ListenerWrapper{
listener: listener,
config: conf,
shouldStop: false,
}
var shouldStop bool
// setup accept goroutine
go func() {
for {
conn, err := listener.Accept()
// synchronously access config data:
wrapper.Lock()
shouldStop = wrapper.shouldStop
conf := wrapper.config
wrapper.Unlock()
if shouldStop {
if conn != nil {
conn.Close()
}
listener.Close()
return
} else if err == nil {
var proxyLine string
if conf.ProxyBeforeTLS {
proxyLine = readRawProxyLine(conn)
if proxyLine == "" {
server.logger.Error("internal", "bad TLS-proxy line from", addr)
conn.Close()
continue
}
}
if conf.TLSConfig != nil {
conn = tls.Server(conn, conf.TLSConfig)
}
newConn := clientConn{
Conn: conn,
Config: conf,
}
// hand off the connection
go server.RunClient(newConn, proxyLine)
} else {
server.logger.Error("internal", "accept error", addr, err.Error())
}
}
}()
return &wrapper, nil
}
// //
// server functionality // server functionality
// //
@ -911,9 +724,9 @@ func (server *Server) loadDatastore(config *Config) error {
} }
func (server *Server) setupListeners(config *Config) (err error) { func (server *Server) setupListeners(config *Config) (err error) {
logListener := func(addr string, config listenerConfig) { logListener := func(addr string, config utils.ListenerConfig) {
server.logger.Info("listeners", server.logger.Info("listeners",
fmt.Sprintf("now listening on %s, tls=%t, tlsproxy=%t, tor=%t, websocket=%t.", addr, (config.TLSConfig != nil), config.ProxyBeforeTLS, config.Tor, config.WebSocket), fmt.Sprintf("now listening on %s, tls=%t, tlsproxy=%t, tor=%t, websocket=%t.", addr, (config.TLSConfig != nil), config.RequireProxy, config.Tor, config.WebSocket),
) )
} }
@ -922,16 +735,22 @@ func (server *Server) setupListeners(config *Config) (err error) {
currentListener := server.listeners[addr] currentListener := server.listeners[addr]
newConfig, stillConfigured := config.Server.trueListeners[addr] newConfig, stillConfigured := config.Server.trueListeners[addr]
currentListener.Lock()
currentListener.shouldStop = !stillConfigured
currentListener.config = newConfig
currentListener.Unlock()
if stillConfigured { if stillConfigured {
err := currentListener.Reload(newConfig)
// attempt to stop and replace the listener if the reload failed
if err != nil {
currentListener.Stop()
newListener, err := NewListener(server, addr, newConfig, config.Server.UnixBindMode)
if err != nil {
delete(server.listeners, addr)
return err
} else {
server.listeners[addr] = newListener
}
}
logListener(addr, newConfig) logListener(addr, newConfig)
} else { } else {
// tell the listener it should stop by interrupting its Accept() call: currentListener.Stop()
currentListener.listener.Close()
delete(server.listeners, addr) delete(server.listeners, addr)
server.logger.Info("listeners", fmt.Sprintf("stopped listening on %s.", addr)) server.logger.Info("listeners", fmt.Sprintf("stopped listening on %s.", addr))
} }
@ -945,17 +764,17 @@ func (server *Server) setupListeners(config *Config) (err error) {
} }
_, exists := server.listeners[newAddr] _, exists := server.listeners[newAddr]
if !exists { if !exists {
// make new listener // make a new listener
listener, listenerErr := server.createListener(newAddr, newConfig, config.Server.UnixBindMode) newListener, listenerErr := NewListener(server, newAddr, newConfig, config.Server.UnixBindMode)
if listenerErr != nil { if err != nil {
server.logger.Error("server", "couldn't listen on", newAddr, listenerErr.Error()) server.logger.Error("server", "couldn't listen on", newAddr, listenerErr.Error())
err = listenerErr err = listenerErr
continue } else {
} server.listeners[newAddr] = newListener
server.listeners[newAddr] = listener
logListener(newAddr, newConfig) logListener(newAddr, newConfig)
} }
} }
}
if publicPlaintextListener != "" { if publicPlaintextListener != "" {
server.logger.Warning("listeners", fmt.Sprintf("Your server is configured with public plaintext listener %s. Consider disabling it for improved security and privacy.", publicPlaintextListener)) server.logger.Warning("listeners", fmt.Sprintf("Your server is configured with public plaintext listener %s. Consider disabling it for improved security and privacy.", publicPlaintextListener))

50
irc/socket.go
View File

@ -5,22 +5,15 @@
package irc package irc
import ( import (
"bufio"
"crypto/sha256"
"crypto/tls"
"encoding/hex"
"errors" "errors"
"io" "io"
"net"
"strings" "strings"
"sync" "sync"
"time"
"github.com/oragono/oragono/irc/utils" "github.com/oragono/oragono/irc/utils"
) )
var ( var (
handshakeTimeout = RegisterTimeout
errSendQExceeded = errors.New("SendQ exceeded") errSendQExceeded = errors.New("SendQ exceeded")
sendQExceededMessage = []byte("\r\nERROR :SendQ Exceeded\r\n") sendQExceededMessage = []byte("\r\nERROR :SendQ Exceeded\r\n")
@ -30,8 +23,7 @@ var (
type Socket struct { type Socket struct {
sync.Mutex sync.Mutex
conn net.Conn conn IRCConn
reader *bufio.Reader
maxSendQBytes int maxSendQBytes int
@ -47,10 +39,9 @@ type Socket struct {
} }
// NewSocket returns a new Socket. // NewSocket returns a new Socket.
func NewSocket(conn net.Conn, maxReadQBytes int, maxSendQBytes int) *Socket { func NewSocket(conn IRCConn, maxSendQBytes int) *Socket {
result := Socket{ result := Socket{
conn: conn, conn: conn,
reader: bufio.NewReaderSize(conn, maxReadQBytes),
maxSendQBytes: maxSendQBytes, maxSendQBytes: maxSendQBytes,
} }
result.writerSemaphore.Initialize(1) result.writerSemaphore.Initialize(1)
@ -66,43 +57,13 @@ func (socket *Socket) Close() {
socket.wakeWriter() socket.wakeWriter()
} }
// CertFP returns the fingerprint of the certificate provided by the client.
func (socket *Socket) CertFP() (string, error) {
var tlsConn, isTLS = socket.conn.(*tls.Conn)
if !isTLS {
return "", errNotTLS
}
// ensure handehake is performed, and timeout after a few seconds
tlsConn.SetDeadline(time.Now().Add(handshakeTimeout))
err := tlsConn.Handshake()
tlsConn.SetDeadline(time.Time{})
if err != nil {
return "", err
}
peerCerts := tlsConn.ConnectionState().PeerCertificates
if len(peerCerts) < 1 {
return "", errNoPeerCerts
}
rawCert := sha256.Sum256(peerCerts[0].Raw)
fingerprint := hex.EncodeToString(rawCert[:])
return fingerprint, nil
}
// Read returns a single IRC line from a Socket. // Read returns a single IRC line from a Socket.
func (socket *Socket) Read() (string, error) { func (socket *Socket) Read() (string, error) {
if socket.IsClosed() { if socket.IsClosed() {
return "", io.EOF return "", io.EOF
} }
lineBytes, isPrefix, err := socket.reader.ReadLine() lineBytes, err := socket.conn.ReadLine()
if isPrefix {
return "", errReadQ
}
// convert bytes to string // convert bytes to string
line := string(lineBytes) line := string(lineBytes)
@ -183,7 +144,7 @@ func (socket *Socket) BlockingWrite(data []byte) (err error) {
return io.EOF return io.EOF
} }
_, err = socket.conn.Write(data) err = socket.conn.Write(data)
if err != nil { if err != nil {
socket.finalize() socket.finalize()
} }
@ -255,8 +216,7 @@ func (socket *Socket) performWrite() (closed bool) {
var err error var err error
if 0 < len(buffers) { if 0 < len(buffers) {
// on Linux, the runtime will optimize this into a single writev(2) call: socket.conn.WriteBuffers(buffers)
_, err = (*net.Buffers)(&buffers).WriteTo(socket.conn)
} }
closed = closed || err != nil closed = closed || err != nil

34
irc/utils/crypto.go
View File

@ -5,12 +5,16 @@ package utils
import ( import (
"crypto/rand" "crypto/rand"
"crypto/sha256"
"crypto/subtle" "crypto/subtle"
"crypto/tls"
"encoding/base32" "encoding/base32"
"encoding/base64" "encoding/base64"
"encoding/hex" "encoding/hex"
"errors" "errors"
"net"
"strings" "strings"
"time"
) )
var ( var (
@ -18,6 +22,10 @@ var (
B32Encoder = base32.NewEncoding("abcdefghijkmnpqrstuvwxyz23456789").WithPadding(base32.NoPadding) B32Encoder = base32.NewEncoding("abcdefghijkmnpqrstuvwxyz23456789").WithPadding(base32.NoPadding)
ErrInvalidCertfp = errors.New("Invalid certfp") ErrInvalidCertfp = errors.New("Invalid certfp")
ErrNoPeerCerts = errors.New("No certfp available")
ErrNotTLS = errors.New("Connection is not TLS")
) )
const ( const (
@ -83,3 +91,29 @@ func NormalizeCertfp(certfp string) (result string, err error) {
} }
return return
} }
func GetCertFP(conn net.Conn, handshakeTimeout time.Duration) (result string, err error) {
tlsConn, isTLS := conn.(*tls.Conn)
if !isTLS {
return "", ErrNotTLS
}
// ensure handshake is performed
tlsConn.SetDeadline(time.Now().Add(handshakeTimeout))
err = tlsConn.Handshake()
tlsConn.SetDeadline(time.Time{})
if err != nil {
return "", err
}
peerCerts := tlsConn.ConnectionState().PeerCertificates
if len(peerCerts) < 1 {
return "", ErrNoPeerCerts
}
rawCert := sha256.Sum256(peerCerts[0].Raw)
fingerprint := hex.EncodeToString(rawCert[:])
return fingerprint, nil
}

30
irc/utils/glob.go Normal file
View File

@ -0,0 +1,30 @@
// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
// released under the MIT license
package utils
import (
"bytes"
"regexp"
"strings"
)
// yet another glob implementation in Go
func CompileGlob(glob string) (result *regexp.Regexp, err error) {
var buf bytes.Buffer
buf.WriteByte('^')
for {
i := strings.IndexByte(glob, '*')
if i == -1 {
buf.WriteString(regexp.QuoteMeta(glob))
break
} else {
buf.WriteString(regexp.QuoteMeta(glob[:i]))
buf.WriteString(".*")
glob = glob[i+1:]
}
}
buf.WriteByte('$')
return regexp.Compile(buf.String())
}

37
irc/utils/glob_test.go Normal file
View File

@ -0,0 +1,37 @@
// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
// released under the MIT license
package utils
import (
"regexp"
"testing"
)
func globMustCompile(glob string) *regexp.Regexp {
re, err := CompileGlob(glob)
if err != nil {
panic(err)
}
return re
}
func assertMatches(glob, str string, match bool, t *testing.T) {
re := globMustCompile(glob)
if re.MatchString(str) != match {
t.Errorf("should %s match %s? %t, but got %t instead", glob, str, match, !match)
}
}
func TestGlob(t *testing.T) {
assertMatches("https://testnet.oragono.io", "https://testnet.oragono.io", true, t)
assertMatches("https://*.oragono.io", "https://testnet.oragono.io", true, t)
assertMatches("*://*.oragono.io", "https://testnet.oragono.io", true, t)
assertMatches("*://*.oragono.io", "https://oragono.io", false, t)
assertMatches("*://*.oragono.io", "https://githubusercontent.com", false, t)
assertMatches("", "", true, t)
assertMatches("", "x", false, t)
assertMatches("*", "", true, t)
assertMatches("*", "x", true, t)
}

49
irc/utils/net.go
View File

@ -22,19 +22,13 @@ var (
func AddrToIP(addr net.Addr) net.IP { func AddrToIP(addr net.Addr) net.IP {
if tcpaddr, ok := addr.(*net.TCPAddr); ok { if tcpaddr, ok := addr.(*net.TCPAddr); ok {
return tcpaddr.IP.To16() return tcpaddr.IP.To16()
} else if AddrIsUnix(addr) { } else if _, ok := addr.(*net.UnixAddr); ok {
return IPv4LoopbackAddress return IPv4LoopbackAddress
} else { } else {
return nil return nil
} }
} }
// AddrIsUnix returns whether the address is a unix domain socket.
func AddrIsUnix(addr net.Addr) bool {
_, ok := addr.(*net.UnixAddr)
return ok
}
// IPStringToHostname converts a string representation of an IP address to an IRC-ready hostname // IPStringToHostname converts a string representation of an IP address to an IRC-ready hostname
func IPStringToHostname(ipStr string) string { func IPStringToHostname(ipStr string) string {
if 0 < len(ipStr) && ipStr[0] == ':' { if 0 < len(ipStr) && ipStr[0] == ':' {
@ -158,3 +152,44 @@ func ParseNetList(netList []string) (nets []net.IPNet, err error) {
} }
return return
} }
// Process the X-Forwarded-For header, validating against a list of trusted IPs.
// Returns the address that the request was forwarded for, or nil if no trustworthy
// data was available.
func HandleXForwardedFor(remoteAddr string, xForwardedFor string, whitelist []net.IPNet) (result net.IP) {
// http.Request.RemoteAddr "has no defined format". with TCP it's typically "127.0.0.1:23784",
// with unix domain it's typically "@"
var remoteIP net.IP
host, _, err := net.SplitHostPort(remoteAddr)
if err != nil {
remoteIP = IPv4LoopbackAddress
} else {
remoteIP = net.ParseIP(host)
}
if remoteIP == nil || !IPInNets(remoteIP, whitelist) {
return remoteIP
}
// walk backwards through the X-Forwarded-For chain looking for an IP
// that is *not* trusted. that means it was added by one of our trusted
// forwarders (either remoteIP or something ahead of it in the chain)
// and we can trust it:
result = remoteIP
forwardedIPs := strings.Split(xForwardedFor, ",")
for i := len(forwardedIPs) - 1; i >= 0; i-- {
proxiedIP := net.ParseIP(strings.TrimSpace(forwardedIPs[i]))
if proxiedIP == nil {
return
} else if !IPInNets(proxiedIP, whitelist) {
return proxiedIP
} else {
result = proxiedIP
}
}
// no valid untrusted IPs were found in the chain;
// return either the last valid and trusted IP (which must be the origin),
// or nil:
return
}

36
irc/utils/net_test.go
View File

@ -159,3 +159,39 @@ func TestNormalizedNetFromString(t *testing.T) {
assertEqual(NetToNormalizedString(network), "2001:db8::1", t) assertEqual(NetToNormalizedString(network), "2001:db8::1", t)
assertEqual(network.Contains(net.ParseIP("2001:0db8::1")), true, t) assertEqual(network.Contains(net.ParseIP("2001:0db8::1")), true, t)
} }
func checkXFF(remoteAddr, forwardedHeader string, expectedStr string, t *testing.T) {
whitelistCIDRs := []string{"10.0.0.0/8", "127.0.0.1/8"}
var whitelist []net.IPNet
for _, str := range whitelistCIDRs {
_, wlNet, err := net.ParseCIDR(str)
if err != nil {
panic(err)
}
whitelist = append(whitelist, *wlNet)
}
expected := net.ParseIP(expectedStr)
actual := HandleXForwardedFor(remoteAddr, forwardedHeader, whitelist)
if !actual.Equal(expected) {
t.Errorf("handling %s and %s, expected %s, got %s", remoteAddr, forwardedHeader, expected, actual)
}
}
func TestXForwardedFor(t *testing.T) {
checkXFF("8.8.4.4:9999", "", "8.8.4.4", t)
// forged XFF header from untrustworthy external IP, should be ignored:
checkXFF("8.8.4.4:9999", "1.1.1.1", "8.8.4.4", t)
checkXFF("10.0.0.4:28432", "", "10.0.0.4", t)
checkXFF("10.0.0.4:28432", "8.8.4.4", "8.8.4.4", t)
checkXFF("10.0.0.4:28432", "10.0.0.3", "10.0.0.3", t)
checkXFF("10.0.0.4:28432", "1.1.1.1, 8.8.4.4", "8.8.4.4", t)
checkXFF("10.0.0.4:28432", "8.8.4.4, 1.1.1.1, 10.0.0.3", "1.1.1.1", t)
checkXFF("10.0.0.4:28432", "10.0.0.1, 10.0.0.2, 10.0.0.3", "10.0.0.1", t)
checkXFF("@", "8.8.4.4, 1.1.1.1, 10.0.0.3", "1.1.1.1", t)
}

174
irc/utils/proxy.go Normal file
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@ -0,0 +1,174 @@
// Copyright (c) 2020 Shivaram Lingamneni <slingamn@cs.stanford.edu>
// released under the MIT license
package utils
import (
"crypto/tls"
"errors"
"net"
"strings"
"sync"
"time"
)
// TODO: handle PROXY protocol v2 (the binary protocol)
const (
// https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
// "a 108-byte buffer is always enough to store all the line and a trailing zero
// for string processing."
maxProxyLineLen = 107
)
var (
ErrBadProxyLine = errors.New("invalid PROXY line")
// TODO(golang/go#4373): replace this with the stdlib ErrNetClosing
ErrNetClosing = errors.New("use of closed network connection")
)
// ListenerConfig is all the information about how to process
// incoming IRC connections on a listener.
type ListenerConfig struct {
TLSConfig *tls.Config
ProxyDeadline time.Duration
RequireProxy bool
// these are just metadata for easier tracking,
// they are not used by ReloadableListener:
Tor bool
STSOnly bool
WebSocket bool
}
// read a PROXY line one byte at a time, to ensure we don't read anything beyond
// that into a buffer, which would break the TLS handshake
func readRawProxyLine(conn net.Conn, deadline time.Duration) (result string) {
// normally this is covered by ping timeouts, but we're doing this outside
// of the normal client goroutine:
conn.SetDeadline(time.Now().Add(deadline))
defer conn.SetDeadline(time.Time{})
var buf [maxProxyLineLen]byte
oneByte := make([]byte, 1)
i := 0
for i < maxProxyLineLen {
n, err := conn.Read(oneByte)
if err != nil {
return
} else if n == 1 {
buf[i] = oneByte[0]
if buf[i] == '\n' {
candidate := string(buf[0 : i+1])
if strings.HasPrefix(candidate, "PROXY") {
return candidate
} else {
return
}
}
i += 1
}
}
// no \r\n, fail out
return
}
// ParseProxyLine parses a PROXY protocol (v1) line and returns the remote IP.
func ParseProxyLine(line string) (ip net.IP, err error) {
params := strings.Fields(line)
if len(params) != 6 || params[0] != "PROXY" {
return nil, ErrBadProxyLine
}
ip = net.ParseIP(params[2])
if ip == nil {
return nil, ErrBadProxyLine
}
return ip.To16(), nil
}
/// ProxiedConnection is a net.Conn with some additional data stapled to it;
// the proxied IP, if one was read via the PROXY protocol, and the listener
// configuration.
type ProxiedConnection struct {
net.Conn
ProxiedIP net.IP
Config ListenerConfig
}
// ReloadableListener is a wrapper for net.Listener that allows reloading
// of config data for postprocessing connections (TLS, PROXY protocol, etc.)
type ReloadableListener struct {
// TODO: make this lock-free
sync.Mutex
realListener net.Listener
config ListenerConfig
isClosed bool
}
func NewReloadableListener(realListener net.Listener, config ListenerConfig) *ReloadableListener {
return &ReloadableListener{
realListener: realListener,
config: config,
}
}
func (rl *ReloadableListener) Reload(config ListenerConfig) {
rl.Lock()
rl.config = config
rl.Unlock()
}
func (rl *ReloadableListener) Accept() (conn net.Conn, err error) {
conn, err = rl.realListener.Accept()
rl.Lock()
config := rl.config
isClosed := rl.isClosed
rl.Unlock()
if isClosed {
if err == nil {
conn.Close()
}
err = ErrNetClosing
}
if err != nil {
return nil, err
}
var proxiedIP net.IP
if config.RequireProxy {
// this will occur synchronously on the goroutine calling Accept(),
// but that's OK because this listener *requires* a PROXY line,
// therefore it must be used with proxies that always send the line
// and we won't get slowloris'ed waiting for the client response
proxyLine := readRawProxyLine(conn, config.ProxyDeadline)
proxiedIP, err = ParseProxyLine(proxyLine)
if err != nil {
conn.Close()
return nil, err
}
}
if config.TLSConfig != nil {
conn = tls.Server(conn, config.TLSConfig)
}
return &ProxiedConnection{
Conn: conn,
ProxiedIP: proxiedIP,
Config: config,
}, nil
}
func (rl *ReloadableListener) Close() error {
rl.Lock()
rl.isClosed = true
rl.Unlock()
return rl.realListener.Close()
}
func (rl *ReloadableListener) Addr() net.Addr {
return rl.realListener.Addr()
}

70
irc/websocket.go
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@ -1,70 +0,0 @@
package irc
import (
"bytes"
"errors"
"github.com/gorilla/websocket"
"net/http"
"time"
"unicode/utf8"
)
var wsUpgrader = websocket.Upgrader{
ReadBufferSize: 2 * 1024,
WriteBufferSize: 2 * 1024,
// If a WS session contains sensitive information, and you choose to use
// cookies for authentication (during the HTTP(S) upgrade request), then
// you should check that Origin is a domain under your control. If it
// isn't, then it is possible for users of your site, visiting a naughty
// Origin, to have a WS opened using their credentials. See
// http://www.christian-schneider.net/CrossSiteWebSocketHijacking.html#main.
// We don't care about Origin because the (IRC) authentication is contained
// in the WS stream -- the WS session is not privileged when it is opened.
CheckOrigin: func(r *http.Request) bool { return true },
}
// WSContainer wraps a WebSocket connection so that it implements net.Conn
// entirely.
type WSContainer struct {
*websocket.Conn
}
func (ws WSContainer) Read(b []byte) (n int, err error) {
var messageType int
var bytes []byte
for {
messageType, bytes, err = ws.ReadMessage()
if messageType == websocket.TextMessage {
n = copy(b, bytes)
return
}
if len(bytes) == 0 {
return 0, nil
}
// Throw other kind of messages away.
}
// We don't want to return (0, nil) here because that would mean the
// connection is closed (Read calls must block until data is received).
}
func (ws WSContainer) Write(b []byte) (n int, err error) {
if !utf8.Valid(b) {
return 0, errors.New("outgoing WebSocket message isn't valid UTF-8")
}
b = bytes.TrimSuffix(b, []byte("\r\n"))
n = len(b)
err = ws.WriteMessage(websocket.TextMessage, b)
return
}
// SetDeadline is part of the net.Conn interface.
func (ws WSContainer) SetDeadline(t time.Time) (err error) {
err = ws.SetWriteDeadline(t)
if err != nil {
return
}
err = ws.SetReadDeadline(t)
return
}

16
oragono.yaml
View File

@ -61,9 +61,12 @@ server:
# "/hidden_service_sockets/oragono_tor_sock": # "/hidden_service_sockets/oragono_tor_sock":
# tor: true # tor: true
# Example of a WebSocket listener. # Example of a WebSocket listener:
#"127.0.0.1:8080": # ":4430":
# websocket: true # websocket: true
# tls:
# key: tls.key
# cert: tls.crt
# sets the permissions for Unix listen sockets. on a typical Linux system, # sets the permissions for Unix listen sockets. on a typical Linux system,
# the default is 0775 or 0755, which prevents other users/groups from connecting # the default is 0775 or 0755, which prevents other users/groups from connecting
@ -106,6 +109,15 @@ server:
# should clients include this STS policy when they ship their inbuilt preload lists? # should clients include this STS policy when they ship their inbuilt preload lists?
preload: false preload: false
websockets:
# sets the Origin headers that will be accepted for websocket connections.
# an empty list means any value (or no value) is allowed. the main use of this
# is to prevent malicious third-party Javascript from co-opting non-malicious
# clients (i.e., mainstream browsers) to DDoS your server.
allowed-origins:
# - "https://oragono.io"
# - "https://*.oragono.io"
# casemapping controls what kinds of strings are permitted as identifiers (nicknames, # casemapping controls what kinds of strings are permitted as identifiers (nicknames,
# channel names, account names, etc.), and how they are normalized for case. # channel names, account names, etc.), and how they are normalized for case.
# with the recommended default of 'precis', utf-8 identifiers that are "sane" # with the recommended default of 'precis', utf-8 identifiers that are "sane"