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config.go
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/
config.go
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/*
* Copyright (c) 2016, Psiphon Inc.
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package server
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"net"
"strconv"
"strings"
"github.com/Psiphon-Inc/crypto/nacl/box"
"github.com/Psiphon-Inc/crypto/ssh"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/protocol"
)
const (
SERVER_CONFIG_FILENAME = "psiphond.config"
SERVER_TRAFFIC_RULES_FILENAME = "psiphond-traffic-rules.config"
SERVER_ENTRY_FILENAME = "server-entry.dat"
DEFAULT_SERVER_IP_ADDRESS = "127.0.0.1"
WEB_SERVER_SECRET_BYTE_LENGTH = 32
DISCOVERY_VALUE_KEY_BYTE_LENGTH = 32
SSH_USERNAME_SUFFIX_BYTE_LENGTH = 8
SSH_PASSWORD_BYTE_LENGTH = 32
SSH_RSA_HOST_KEY_BITS = 2048
SSH_OBFUSCATED_KEY_BYTE_LENGTH = 32
)
// Config specifies the configuration and behavior of a Psiphon
// server.
type Config struct {
// LogLevel specifies the log level. Valid values are:
// panic, fatal, error, warn, info, debug
LogLevel string
// LogFilename specifies the path of the file to log
// to. When blank, logs are written to stderr.
LogFilename string
// SkipPanickingLogWriter disables panicking when
// unable to write any logs.
SkipPanickingLogWriter bool
// DiscoveryValueHMACKey is the network-wide secret value
// used to determine a unique discovery strategy.
DiscoveryValueHMACKey string
// GeoIPDatabaseFilenames are paths of GeoIP2/GeoLite2
// MaxMind database files. When empty, no GeoIP lookups are
// performed. Each file is queried, in order, for the
// logged fields: country code, city, and ISP. Multiple
// file support accomodates the MaxMind distribution where
// ISP data in a separate file.
GeoIPDatabaseFilenames []string
// PsinetDatabaseFilename is the path of the Psiphon automation
// jsonpickle format Psiphon API data file.
PsinetDatabaseFilename string
// HostID is the ID of the server host; this is used for API
// event logging.
HostID string
// ServerIPAddress is the public IP address of the server.
ServerIPAddress string
// WebServerPort is the listening port of the web server.
// When <= 0, no web server component is run.
WebServerPort int
// WebServerSecret is the unique secret value that the client
// must supply to make requests to the web server.
WebServerSecret string
// WebServerCertificate is the certificate the client uses to
// authenticate the web server.
WebServerCertificate string
// WebServerPrivateKey is the private key the web server uses to
// authenticate itself to clients.
WebServerPrivateKey string
// WebServerPortForwardAddress specifies the expected network
// address ("<host>:<port>") specified in a client's port forward
// HostToConnect and PortToConnect when the client is making a
// tunneled connection to the web server. This address is always
// exempted from validation against SSH_DISALLOWED_PORT_FORWARD_HOSTS
// and AllowTCPPorts.
WebServerPortForwardAddress string
// WebServerPortForwardRedirectAddress specifies an alternate
// destination address to be substituted and dialed instead of
// the original destination when the port forward destination is
// WebServerPortForwardAddress.
WebServerPortForwardRedirectAddress string
// TunnelProtocolPorts specifies which tunnel protocols to run
// and which ports to listen on for each protocol. Valid tunnel
// protocols include: "SSH", "OSSH", "UNFRONTED-MEEK-OSSH",
// "UNFRONTED-MEEK-HTTPS-OSSH", "FRONTED-MEEK-OSSH",
// "FRONTED-MEEK-HTTP-OSSH".
TunnelProtocolPorts map[string]int
// SSHPrivateKey is the SSH host key. The same key is used for
// all protocols, run by this server instance, which use SSH.
SSHPrivateKey string
// SSHServerVersion is the server version presented in the
// identification string. The same value is used for all
// protocols, run by this server instance, which use SSH.
SSHServerVersion string
// SSHUserName is the SSH user name to be presented by the
// the tunnel-core client. The same value is used for all
// protocols, run by this server instance, which use SSH.
SSHUserName string
// SSHPassword is the SSH password to be presented by the
// the tunnel-core client. The same value is used for all
// protocols, run by this server instance, which use SSH.
SSHPassword string
// ObfuscatedSSHKey is the secret key for use in the Obfuscated
// SSH protocol. The same secret key is used for all protocols,
// run by this server instance, which use Obfuscated SSH.
ObfuscatedSSHKey string
// MeekCookieEncryptionPrivateKey is the NaCl private key used
// to decrypt meek cookie payload sent from clients. The same
// key is used for all meek protocols run by this server instance.
MeekCookieEncryptionPrivateKey string
// MeekObfuscatedKey is the secret key used for obfuscating
// meek cookies sent from clients. The same key is used for all
// meek protocols run by this server instance.
MeekObfuscatedKey string
// MeekProhibitedHeaders is a list of HTTP headers to check for
// in client requests. If one of these headers is found, the
// request fails. This is used to defend against abuse.
MeekProhibitedHeaders []string
// MeekProxyForwardedForHeaders is a list of HTTP headers which
// may be added by downstream HTTP proxies or CDNs in front
// of clients. These headers supply the original client IP
// address, which is geolocated for stats purposes. Headers
// include, for example, X-Forwarded-For. The header's value
// is assumed to be a comma delimted list of IP addresses where
// the client IP is the first IP address in the list. Meek protocols
// look for these headers and use the client IP address from
// the header if any one is present and the value is a valid
// IP address; otherwise the direct connection remote address is
// used as the client IP.
MeekProxyForwardedForHeaders []string
// UDPInterceptUdpgwServerAddress specifies the network address of
// a udpgw server which clients may be port forwarding to. When
// specified, these TCP port forwards are intercepted and handled
// directly by this server, which parses the SSH channel using the
// udpgw protocol. Handling includes udpgw transparent DNS: tunneled
// UDP DNS packets are rerouted to the host's DNS server.
//
// The intercept is applied before the port forward destination is
// validated against SSH_DISALLOWED_PORT_FORWARD_HOSTS and
// AllowTCPPorts. So the intercept address may be any otherwise
// prohibited destination.
UDPInterceptUdpgwServerAddress string
// DNSResolverIPAddress specifies the IP address of a DNS server
// to be used when "/etc/resolv.conf" doesn't exist or fails to
// parse. When blank, "/etc/resolv.conf" must contain a usable
// "nameserver" entry.
DNSResolverIPAddress string
// LoadMonitorPeriodSeconds indicates how frequently to log server
// load information (number of connected clients per tunnel protocol,
// number of running goroutines, amount of memory allocated, etc.)
// The default, 0, disables load logging.
LoadMonitorPeriodSeconds int
// ProcessProfileOutputDirectory is the path of a directory to which
// process profiles will be written when signaled with SIGUSR2. The
// files are overwritten on each invocation. When set to the default
// value, blank, no profiles are written on SIGUSR2. Profiles include
// the default profiles here: https://golang.org/pkg/runtime/pprof/#Profile.
ProcessProfileOutputDirectory string
// ProcessBlockProfileDurationSeconds specifies the sample duration for
// "block" profiling. For the default, 0, no "block" profile is taken.
ProcessBlockProfileDurationSeconds int
// ProcessCPUProfileDurationSeconds specifies the sample duration for
// CPU profiling. For the default, 0, no CPU profile is taken.
ProcessCPUProfileDurationSeconds int
// TrafficRulesFilename is the path of a file containing a JSON-encoded
// TrafficRulesSet, the traffic rules to apply to Psiphon client tunnels.
TrafficRulesFilename string
// OSLConfigFilename is the path of a file containing a JSON-encoded
// OSL Config, the OSL schemes to apply to Psiphon client tunnels.
OSLConfigFilename string
}
// RunWebServer indicates whether to run a web server component.
func (config *Config) RunWebServer() bool {
return config.WebServerPort > 0
}
// RunLoadMonitor indicates whether to monitor and log server load.
func (config *Config) RunLoadMonitor() bool {
return config.LoadMonitorPeriodSeconds > 0
}
// LoadConfig loads and validates a JSON encoded server config.
func LoadConfig(configJSON []byte) (*Config, error) {
var config Config
err := json.Unmarshal(configJSON, &config)
if err != nil {
return nil, common.ContextError(err)
}
if config.ServerIPAddress == "" {
return nil, errors.New("ServerIPAddress is required")
}
if config.WebServerPort > 0 && (config.WebServerSecret == "" || config.WebServerCertificate == "" ||
config.WebServerPrivateKey == "") {
return nil, errors.New(
"Web server requires WebServerSecret, WebServerCertificate, WebServerPrivateKey")
}
if config.WebServerPortForwardAddress != "" {
if err := validateNetworkAddress(config.WebServerPortForwardAddress, false); err != nil {
return nil, errors.New("WebServerPortForwardAddress is invalid")
}
}
if config.WebServerPortForwardRedirectAddress != "" {
if config.WebServerPortForwardAddress == "" {
return nil, errors.New(
"WebServerPortForwardRedirectAddress requires WebServerPortForwardAddress")
}
if err := validateNetworkAddress(config.WebServerPortForwardRedirectAddress, false); err != nil {
return nil, errors.New("WebServerPortForwardRedirectAddress is invalid")
}
}
for tunnelProtocol, _ := range config.TunnelProtocolPorts {
if !common.Contains(protocol.SupportedTunnelProtocols, tunnelProtocol) {
return nil, fmt.Errorf("Unsupported tunnel protocol: %s", tunnelProtocol)
}
if protocol.TunnelProtocolUsesSSH(tunnelProtocol) ||
protocol.TunnelProtocolUsesObfuscatedSSH(tunnelProtocol) {
if config.SSHPrivateKey == "" || config.SSHServerVersion == "" ||
config.SSHUserName == "" || config.SSHPassword == "" {
return nil, fmt.Errorf(
"Tunnel protocol %s requires SSHPrivateKey, SSHServerVersion, SSHUserName, SSHPassword",
tunnelProtocol)
}
}
if protocol.TunnelProtocolUsesObfuscatedSSH(tunnelProtocol) {
if config.ObfuscatedSSHKey == "" {
return nil, fmt.Errorf(
"Tunnel protocol %s requires ObfuscatedSSHKey",
tunnelProtocol)
}
}
if protocol.TunnelProtocolUsesMeekHTTP(tunnelProtocol) ||
protocol.TunnelProtocolUsesMeekHTTPS(tunnelProtocol) {
if config.MeekCookieEncryptionPrivateKey == "" || config.MeekObfuscatedKey == "" {
return nil, fmt.Errorf(
"Tunnel protocol %s requires MeekCookieEncryptionPrivateKey, MeekObfuscatedKey",
tunnelProtocol)
}
}
}
if config.UDPInterceptUdpgwServerAddress != "" {
if err := validateNetworkAddress(config.UDPInterceptUdpgwServerAddress, true); err != nil {
return nil, fmt.Errorf("UDPInterceptUdpgwServerAddress is invalid: %s", err)
}
}
if config.DNSResolverIPAddress != "" {
if net.ParseIP(config.DNSResolverIPAddress) == nil {
return nil, fmt.Errorf("DNSResolverIPAddress is invalid")
}
}
return &config, nil
}
func validateNetworkAddress(address string, requireIPaddress bool) error {
host, portStr, err := net.SplitHostPort(address)
if err != nil {
return err
}
if requireIPaddress && net.ParseIP(host) == nil {
return errors.New("host must be an IP address")
}
port, err := strconv.Atoi(portStr)
if err != nil {
return err
}
if port < 0 || port > 65535 {
return errors.New("invalid port")
}
return nil
}
// GenerateConfigParams specifies customizations to be applied to
// a generated server config.
type GenerateConfigParams struct {
LogFilename string
SkipPanickingLogWriter bool
LogLevel string
ServerIPAddress string
WebServerPort int
EnableSSHAPIRequests bool
TunnelProtocolPorts map[string]int
TrafficRulesFilename string
}
// GenerateConfig creates a new Psiphon server config. It returns JSON
// encoded configs and a client-compatible "server entry" for the server. It
// generates all necessary secrets and key material, which are emitted in
// the config file and server entry as necessary.
// GenerateConfig uses sample values for many fields. The intention is for
// generated configs to be used for testing or as a template for production
// setup, not to generate production-ready configurations.
func GenerateConfig(params *GenerateConfigParams) ([]byte, []byte, []byte, error) {
// Input validation
if net.ParseIP(params.ServerIPAddress) == nil {
return nil, nil, nil, common.ContextError(errors.New("invalid IP address"))
}
if len(params.TunnelProtocolPorts) == 0 {
return nil, nil, nil, common.ContextError(errors.New("no tunnel protocols"))
}
usedPort := make(map[int]bool)
if params.WebServerPort != 0 {
usedPort[params.WebServerPort] = true
}
usingMeek := false
for tunnelProtocol, port := range params.TunnelProtocolPorts {
if !common.Contains(protocol.SupportedTunnelProtocols, tunnelProtocol) {
return nil, nil, nil, common.ContextError(errors.New("invalid tunnel protocol"))
}
if usedPort[port] {
return nil, nil, nil, common.ContextError(errors.New("duplicate listening port"))
}
usedPort[port] = true
if protocol.TunnelProtocolUsesMeekHTTP(tunnelProtocol) ||
protocol.TunnelProtocolUsesMeekHTTPS(tunnelProtocol) {
usingMeek = true
}
}
// Web server config
var webServerSecret, webServerCertificate,
webServerPrivateKey, webServerPortForwardAddress string
if params.WebServerPort != 0 {
var err error
webServerSecret, err = common.MakeRandomStringHex(WEB_SERVER_SECRET_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
webServerCertificate, webServerPrivateKey, err = GenerateWebServerCertificate("")
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
webServerPortForwardAddress = net.JoinHostPort(
params.ServerIPAddress, strconv.Itoa(params.WebServerPort))
}
// SSH config
// TODO: use other key types: anti-fingerprint by varying params
rsaKey, err := rsa.GenerateKey(rand.Reader, SSH_RSA_HOST_KEY_BITS)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
sshPrivateKey := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(rsaKey),
},
)
signer, err := ssh.NewSignerFromKey(rsaKey)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
sshPublicKey := signer.PublicKey()
sshUserNameSuffix, err := common.MakeRandomStringHex(SSH_USERNAME_SUFFIX_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
sshUserName := "psiphon_" + sshUserNameSuffix
sshPassword, err := common.MakeRandomStringHex(SSH_PASSWORD_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
// TODO: vary version string for anti-fingerprint
sshServerVersion := "SSH-2.0-Psiphon"
// Obfuscated SSH config
obfuscatedSSHKey, err := common.MakeRandomStringHex(SSH_OBFUSCATED_KEY_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
// Meek config
var meekCookieEncryptionPublicKey, meekCookieEncryptionPrivateKey, meekObfuscatedKey string
if usingMeek {
rawMeekCookieEncryptionPublicKey, rawMeekCookieEncryptionPrivateKey, err :=
box.GenerateKey(rand.Reader)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
meekCookieEncryptionPublicKey = base64.StdEncoding.EncodeToString(rawMeekCookieEncryptionPublicKey[:])
meekCookieEncryptionPrivateKey = base64.StdEncoding.EncodeToString(rawMeekCookieEncryptionPrivateKey[:])
meekObfuscatedKey, err = common.MakeRandomStringHex(SSH_OBFUSCATED_KEY_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
}
// Other config
discoveryValueHMACKey, err := common.MakeRandomStringBase64(DISCOVERY_VALUE_KEY_BYTE_LENGTH)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
// Assemble configs and server entry
// Note: this config is intended for either testing or as an illustrative
// example or template and is not intended for production deployment.
logLevel := params.LogLevel
if logLevel == "" {
logLevel = "info"
}
config := &Config{
LogLevel: logLevel,
LogFilename: params.LogFilename,
SkipPanickingLogWriter: params.SkipPanickingLogWriter,
GeoIPDatabaseFilenames: nil,
HostID: "example-host-id",
ServerIPAddress: params.ServerIPAddress,
DiscoveryValueHMACKey: discoveryValueHMACKey,
WebServerPort: params.WebServerPort,
WebServerSecret: webServerSecret,
WebServerCertificate: webServerCertificate,
WebServerPrivateKey: webServerPrivateKey,
WebServerPortForwardAddress: webServerPortForwardAddress,
SSHPrivateKey: string(sshPrivateKey),
SSHServerVersion: sshServerVersion,
SSHUserName: sshUserName,
SSHPassword: sshPassword,
ObfuscatedSSHKey: obfuscatedSSHKey,
TunnelProtocolPorts: params.TunnelProtocolPorts,
DNSResolverIPAddress: "8.8.8.8",
UDPInterceptUdpgwServerAddress: "127.0.0.1:7300",
MeekCookieEncryptionPrivateKey: meekCookieEncryptionPrivateKey,
MeekObfuscatedKey: meekObfuscatedKey,
MeekProhibitedHeaders: nil,
MeekProxyForwardedForHeaders: []string{"X-Forwarded-For"},
LoadMonitorPeriodSeconds: 300,
TrafficRulesFilename: params.TrafficRulesFilename,
}
encodedConfig, err := json.MarshalIndent(config, "\n", " ")
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
intPtr := func(i int) *int {
return &i
}
trafficRulesSet := &TrafficRulesSet{
DefaultRules: TrafficRules{
RateLimits: RateLimits{
ReadUnthrottledBytes: new(int64),
ReadBytesPerSecond: new(int64),
WriteUnthrottledBytes: new(int64),
WriteBytesPerSecond: new(int64),
},
IdleTCPPortForwardTimeoutMilliseconds: intPtr(DEFAULT_IDLE_TCP_PORT_FORWARD_TIMEOUT_MILLISECONDS),
IdleUDPPortForwardTimeoutMilliseconds: intPtr(DEFAULT_IDLE_UDP_PORT_FORWARD_TIMEOUT_MILLISECONDS),
MaxTCPPortForwardCount: intPtr(DEFAULT_MAX_TCP_PORT_FORWARD_COUNT),
MaxUDPPortForwardCount: intPtr(DEFAULT_MAX_UDP_PORT_FORWARD_COUNT),
AllowTCPPorts: nil,
AllowUDPPorts: nil,
},
}
encodedTrafficRulesSet, err := json.MarshalIndent(trafficRulesSet, "\n", " ")
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
capabilities := []string{}
if params.EnableSSHAPIRequests {
capabilities = append(capabilities, protocol.CAPABILITY_SSH_API_REQUESTS)
}
if params.WebServerPort != 0 {
capabilities = append(capabilities, protocol.CAPABILITY_UNTUNNELED_WEB_API_REQUESTS)
}
for tunnelProtocol, _ := range params.TunnelProtocolPorts {
capabilities = append(capabilities, protocol.GetCapability(tunnelProtocol))
}
sshPort := params.TunnelProtocolPorts["SSH"]
obfuscatedSSHPort := params.TunnelProtocolPorts["OSSH"]
// Meek port limitations
// - fronted meek protocols are hard-wired in the client to be port 443 or 80.
// - only one other meek port may be specified.
meekPort := params.TunnelProtocolPorts["UNFRONTED-MEEK-OSSH"]
if meekPort == 0 {
meekPort = params.TunnelProtocolPorts["UNFRONTED-MEEK-HTTPS-OSSH"]
}
if meekPort == 0 {
meekPort = params.TunnelProtocolPorts["UNFRONTED-MEEK-SESSION-TICKET-OSSH"]
}
// Note: fronting params are a stub; this server entry will exercise
// client and server fronting code paths, but not actually traverse
// a fronting hop.
serverEntryWebServerPort := ""
strippedWebServerCertificate := ""
if params.WebServerPort != 0 {
serverEntryWebServerPort = fmt.Sprintf("%d", params.WebServerPort)
// Server entry format omits the BEGIN/END lines and newlines
lines := strings.Split(webServerCertificate, "\n")
strippedWebServerCertificate = strings.Join(lines[1:len(lines)-2], "")
}
serverEntry := &protocol.ServerEntry{
IpAddress: params.ServerIPAddress,
WebServerPort: serverEntryWebServerPort,
WebServerSecret: webServerSecret,
WebServerCertificate: strippedWebServerCertificate,
SshPort: sshPort,
SshUsername: sshUserName,
SshPassword: sshPassword,
SshHostKey: base64.RawStdEncoding.EncodeToString(sshPublicKey.Marshal()),
SshObfuscatedPort: obfuscatedSSHPort,
SshObfuscatedKey: obfuscatedSSHKey,
Capabilities: capabilities,
Region: "US",
MeekServerPort: meekPort,
MeekCookieEncryptionPublicKey: meekCookieEncryptionPublicKey,
MeekObfuscatedKey: meekObfuscatedKey,
MeekFrontingHosts: []string{params.ServerIPAddress},
MeekFrontingAddresses: []string{params.ServerIPAddress},
MeekFrontingDisableSNI: false,
}
encodedServerEntry, err := protocol.EncodeServerEntry(serverEntry)
if err != nil {
return nil, nil, nil, common.ContextError(err)
}
return encodedConfig, encodedTrafficRulesSet, []byte(encodedServerEntry), nil
}