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config.go
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package kpx
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/google/uuid"
"github.com/howeyc/gopass"
"github.com/palantir/stacktrace"
"golang.org/x/text/encoding/charmap"
yaml2 "gopkg.in/yaml.v2"
)
type Config struct {
conf Conf
pac string
lastProxies map[string]time.Time
lastMMutex sync.RWMutex
certsManager *CertsManager
disableAutoUpdate bool
hostsCache map[string]*HostCache
hostsCacheMutex sync.RWMutex
pacsCache map[string]string
needFastReload bool
}
type HostCache struct {
rule *ConfRule
proxy []*ConfProxy
}
const EXPERIMENTAL_CONNETION_POOLS = "connection-pools"
const EXPERIMENTAL_HOSTS_CACHE = "hosts-cache"
const CREDENTIAL_KERBEROS = "kerberos"
func NewConfig(name string) (*Config, error) {
var config = Config{
conf: Conf{
Proxies: make(map[string]*ConfProxy),
Rules: make([]*ConfRule, 0),
SocksRules: make([]*ConfRule, 0),
ConnectTimeout: DEFAULT_CONNECT_TIMEOUT,
IdleTimeout: DEFAULT_IDLE_TIMOUT,
CloseTimeout: DEFAULT_CLOSE_TIMEOUT,
},
lastProxies: map[string]time.Time{},
hostsCache: map[string]*HostCache{},
pacsCache: map[string]string{},
}
var err error
if name == "" {
err = config.readFromConfig()
} else {
err = config.readFromFile(name)
}
config.conf.Trace = config.conf.Trace || options.Trace
config.conf.Debug = config.conf.Debug || options.Debug || config.conf.Trace
config.conf.Verbose = config.conf.Verbose || options.Verbose || config.conf.Debug
config.conf.experimentalConnectionPools = isExperimental(config.conf.Experimental, EXPERIMENTAL_CONNETION_POOLS)
config.conf.experimentalHostsCache = isExperimental(config.conf.Experimental, EXPERIMENTAL_HOSTS_CACHE)
if err != nil {
return nil, stacktrace.Propagate(err, "unable to read config")
}
err = config.check()
if err != nil {
return nil, stacktrace.Propagate(err, "invalid config")
}
err = config.build()
if err != nil {
return nil, stacktrace.Propagate(err, "unable to build config")
}
err = config.genPac()
if err != nil {
return nil, stacktrace.Propagate(err, "unable to build config pac")
}
err = config.genCerts()
if err != nil {
return nil, stacktrace.Propagate(err, "unable to load certificates")
}
return &config, nil
}
func isExperimental(conf string, name string) bool {
return strings.Contains(" "+strings.ReplaceAll(conf, ",", " ")+" ", " "+name+" ")
}
func (c *Config) readFromConfig() error {
c.conf.Bind = options.bindHost
c.conf.Port = options.bindPort
c.conf.Proxies = map[string]*ConfProxy{}
proxyName := "krb"
proxyType := ProxyKerberos
proxySpn := "HTTP"
proxyCred := "user"
c.conf.Proxies[proxyName] = &ConfProxy{
Type: &proxyType,
Spn: &proxySpn,
Realm: &options.domain,
Host: &options.proxyHost,
Port: options.proxyPort,
Credential: &proxyCred,
}
c.conf.Credentials = map[string]*ConfCred{}
c.conf.Credentials[proxyCred] = &ConfCred{
Login: &options.login,
}
c.conf.Rules = make([]*ConfRule, 1)
ruleHost := "*"
c.conf.Rules[0] = &ConfRule{
Host: &ruleHost,
Proxy: &proxyName,
}
return nil
}
func (c *Config) readFromFile(filename string) error {
var yaml []byte
var err error
yaml, err = os.ReadFile(filename)
if err != nil {
return stacktrace.Propagate(err, "unable to read file")
}
if strings.HasPrefix(strings.TrimSpace(string(yaml)), "{") {
err = json.Unmarshal(yaml, &c.conf)
} else {
err = yaml2.Unmarshal(yaml, &c.conf)
}
if err != nil {
return stacktrace.Propagate(err, "unable to read file as yaml/json")
}
if options.Listen != "" {
h, p := splitHostPort(options.Listen, "127.0.0.1", "0", true)
c.conf.Bind = h
c.conf.Port, _ = strconv.Atoi(p)
}
if options.User != "" {
for _, cred := range c.conf.Credentials {
// auto-fill missing login
if cred.Login == nil {
cred.Login = &options.User
cred.Password = nil
}
}
}
return nil
}
func (c *Config) check() (err error) {
// check proxies
for name, proxy := range c.conf.Proxies {
if name == "" || name == ProxyDirect.Name() || name == ProxyNone.Name() || strings.HasPrefix(name, "$") {
return stacktrace.NewError("proxy '%s': name cannot be empty, 'direct', 'none' or start with a '$'", name)
}
if proxy.Type == nil {
return stacktrace.NewError("proxy '%s': must contain 'type' (kerberos,socks,basic,anonymous,pac)", name)
}
proxy.typeValue = proxy.Type.Value()
if proxy.typeValue == -1 {
return stacktrace.NewError("proxy '%s': must contain 'type' (kerberos,socks,basic,anonymous,pac)", name)
}
if *proxy.Type != ProxyPac {
if proxy.Url != nil {
return stacktrace.NewError("proxy '%s': non-pac proxy must not contain 'url'", name)
}
if proxy.Host == nil {
return stacktrace.NewError("proxy '%s': non-pac proxy must contain 'host'", name)
}
if proxy.Port == 0 {
return stacktrace.NewError("proxy '%s': non-pac proxy port number must be > 0", name)
}
if proxy.Credentials != nil {
return stacktrace.NewError("proxy '%s': non-pac proxy must not contain 'credentials'", name)
}
} else {
if proxy.Url == nil {
return stacktrace.NewError("proxy '%s': pac proxy must contain 'url'", name)
}
if proxy.Host != nil {
return stacktrace.NewError("proxy '%s': pac proxy must not contain 'host'", name)
}
if proxy.Port != 0 {
return stacktrace.NewError("proxy '%s': pac proxy port number must be > 0", name)
}
}
if *proxy.Type == ProxyAnonymous || *proxy.Type == ProxyPac {
if proxy.Credential != nil {
return stacktrace.NewError("proxy '%s': anonymous and pac proxies must not contain 'credential'", name)
}
}
if proxy.Credential != nil && *proxy.Credential != "" && *proxy.Credential != CREDENTIAL_KERBEROS && c.conf.Credentials[*proxy.Credential] == nil {
return stacktrace.NewError("proxy '%s': credential '%s' must exist in 'credentials'", name, *proxy.Credential)
}
for _, cred := range c.splitCredentials(proxy.Credentials) {
if cred != CREDENTIAL_KERBEROS && c.conf.Credentials[cred] == nil {
return stacktrace.NewError("proxy '%s': credential '%s' must exist in 'credentials'", name, cred)
}
}
}
// check credentials
for name, cred := range c.conf.Credentials {
if name == "" || name == CREDENTIAL_KERBEROS || strings.HasPrefix(name, "$") {
return stacktrace.NewError("credential '%s': name cannot be empty, 'kerberos' or start with '$'", name)
}
if cred.Password != nil && cred.Login == nil {
return stacktrace.NewError("credential '%s': password cannot be set without login being set", name)
}
}
// check http rules
for i, rule := range c.conf.Rules {
if rule.Host == nil {
return stacktrace.NewError("rule %d: must contain 'host'", i)
}
if rule.Proxy == nil && rule.Dns == nil {
return stacktrace.NewError("rule %d: must contain 'proxy' or 'dns'", i)
}
if rule.Proxy != nil {
if *rule.Proxy != ProxyDirect.Name() && *rule.Proxy != ProxyNone.Name() {
for _, p := range rule.allProxiesName() {
if c.conf.Proxies[p] == nil {
return stacktrace.NewError("rule %d: '%s' must exist in 'proxies', or be 'direct' or 'none'", i, p)
}
}
}
}
if rule.Proxy != nil && rule.Dns != nil {
if *rule.Proxy == ProxyDirect.Name() {
} else if c.conf.Proxies[*rule.Proxy] != nil {
for _, p := range rule.allProxiesName() {
if *c.conf.Proxies[p].Type != ProxySocks {
return stacktrace.NewError("rule %d: rule with dns must have a 'direct' proxy or proxy of type 'socks'", i)
}
}
}
}
if rule.Dns != nil {
hp := strings.Split(*rule.Dns, ":")
if len(hp) == 0 || len(hp) > 2 {
return stacktrace.NewError("rule %d: dns must be like '[IP][:PORT]', i.e 'IP' or 'IP:PORT' or ':PORT'", i)
}
}
}
// check socks rules
for i, rule := range c.conf.SocksRules {
if rule.Host == nil {
return stacktrace.NewError("socks rule %d: must contain 'host'", i)
}
if rule.Proxy == nil && rule.Dns == nil {
return stacktrace.NewError("socks rule %d: must contain 'proxy' or 'dns'", i)
}
if rule.Proxy != nil {
if *rule.Proxy != ProxyDirect.Name() && *rule.Proxy != ProxyNone.Name() {
for _, p := range rule.allProxiesName() {
if c.conf.Proxies[p] == nil {
return stacktrace.NewError("socks rule %d: '%s' must exist in 'proxies', or be 'direct' or 'none'", i, p)
}
}
}
}
if rule.Proxy != nil {
if *rule.Proxy == ProxyDirect.Name() {
} else if c.conf.Proxies[*rule.Proxy] != nil {
for _, p := range rule.allProxiesName() {
if *c.conf.Proxies[p].Type != ProxySocks {
return stacktrace.NewError("socks rule %d: must have a 'direct' proxy or proxy of type 'socks'", i)
} else if c.conf.Proxies[p].Credential != nil && *c.conf.Proxies[p].Credential == "" {
return stacktrace.NewError("socks rule %d: must not have a per-user credential (empty value)", i)
}
}
}
}
if rule.Proxy != nil && rule.Dns != nil {
if *rule.Proxy == ProxyDirect.Name() {
} else if c.conf.Proxies[*rule.Proxy] != nil {
for _, p := range rule.allProxiesName() {
if *c.conf.Proxies[p].Type != ProxySocks {
return stacktrace.NewError("socks rule %d: rule with dns must have a 'direct' proxy or proxy of type 'socks'", i)
}
}
}
}
if rule.Dns != nil {
hp := strings.Split(*rule.Dns, ":")
if len(hp) == 0 || len(hp) > 2 {
return stacktrace.NewError("socks rule %d: dns must be like '[IP][:PORT]', i.e 'IP' or 'IP:PORT' or ':PORT'", i)
}
}
}
return nil
}
func (c *Config) build() error {
if c.conf.Credentials == nil {
c.conf.Credentials = make(map[string]*ConfCred)
}
// build server bind
if c.conf.Bind == "" {
c.conf.Bind = "127.0.0.1"
}
// build server pac proxy string
c.conf.pacProxy = fmt.Sprint("PROXY ", c.conf.Bind, ":", c.conf.Port)
// build rules
for _, rule := range c.conf.Rules {
regex, err := c.regex(*rule.Host)
if err != nil {
return stacktrace.Propagate(err, "unable to compile rule regex")
}
rule.regex = regex
}
for _, rule := range c.conf.SocksRules {
regex, err := c.regex(*rule.Host)
if err != nil {
return stacktrace.Propagate(err, "unable to compile rule regex")
}
rule.regex = regex
}
// add none proxy
noneName := ProxyNone.Name()
noneType := ProxyNone
noneProxy := ConfProxy{
name: &noneName,
Type: &noneType,
typeValue: ProxyNone.Value(),
}
c.conf.Proxies[noneName] = &noneProxy
// add direct proxy
directName := ProxyDirect.Name()
directType := ProxyDirect
directProxy := ConfProxy{
name: &directName,
Type: &directType,
typeValue: ProxyDirect.Value(),
}
c.conf.Proxies[directName] = &directProxy
// add native kerberos credential
kerberosName := CREDENTIAL_KERBEROS
kerberosCred := ConfCred{
name: &kerberosName,
isNative: true,
}
c.conf.Credentials[kerberosName] = &kerberosCred
// build proxies
for name, proxy := range c.conf.Proxies {
proxyName := name
proxy.name = &proxyName
if *proxy.Type == ProxyKerberos || *proxy.Type == ProxyBasic || *proxy.Type == ProxySocks {
//proxy.krb = fmt.Sprint(krb)
switch {
case proxy.Credential == nil:
if *proxy.Type == ProxyKerberos || *proxy.Type == ProxyBasic {
name := fmt.Sprint("$null-", *proxy.name)
proxy.cred = &ConfCred{
name: &name,
isNull: true,
}
c.conf.Credentials[name] = proxy.cred
}
case *proxy.Credential == "":
name := fmt.Sprint("$user-", *proxy.name)
proxy.cred = &ConfCred{
name: &name,
isPerUser: true,
}
c.conf.Credentials[name] = proxy.cred
default:
proxy.cred = c.conf.Credentials[*proxy.Credential]
}
}
switch *proxy.Type {
case ProxyKerberos, ProxyBasic:
proxy.pacProxy = nil
// if per user, directly proxy to target who will ask for credentials
if proxy.cred.isPerUser {
pacProxy := c.genProxy("PROXY", *proxy.Host, proxy.Port)
proxy.pacProxy = &pacProxy
}
case ProxyDirect:
pacProxy := "DIRECT"
proxy.pacProxy = &pacProxy
case ProxySocks:
proxy.pacProxy = nil
// if no authentication, directly proxy to target
if proxy.cred == nil {
pacProxy := c.genProxy("SOCKS", *proxy.Host, proxy.Port)
proxy.pacProxy = &pacProxy
}
case ProxyAnonymous:
pacProxy := c.genProxy("PROXY", *proxy.Host, proxy.Port)
proxy.pacProxy = &pacProxy
}
if proxy.Pac != nil {
regex, err := c.regex(*proxy.Pac)
if err != nil {
return stacktrace.Propagate(err, "proxy '%s': unable to compile pac regex", *proxy.name)
}
proxy.pacRegex = regex
}
}
// build creds
for name, cred := range c.conf.Credentials {
credName := name
cred.name = &credName
if cred.Password != nil && strings.HasPrefix(*cred.Password, ENCRYPTED) {
password, err := decrypt((*cred.Password)[len(ENCRYPTED):])
if err != nil {
return stacktrace.Propagate(err, "unable to decrypt '%s' password", name)
}
cred.Password = &password
}
}
// update rules and isUsed
for _, rule := range c.conf.Rules {
if rule.Dns != nil && rule.Proxy == nil {
rule.Proxy = &directName
} else {
for _, p := range rule.allProxiesName() {
proxy := c.conf.Proxies[p]
proxy.isUsed = true
if proxy.cred != nil && !proxy.cred.isPerUser {
proxy.cred.isUsed = true
}
}
}
}
for _, rule := range c.conf.SocksRules {
if rule.Dns != nil && rule.Proxy == nil {
rule.Proxy = &directName
} else {
for _, p := range rule.allProxiesName() {
proxy := c.conf.Proxies[p]
proxy.isUsed = true
if proxy.cred != nil && !proxy.cred.isPerUser {
proxy.cred.isUsed = true
}
}
}
}
// download proxy pac
for _, proxy := range c.conf.Proxies {
if proxy.isUsed && *proxy.Type == ProxyPac {
logInfo("[-] Loading proxy pac: %s", *proxy.Url)
js, ex, err := c.downloadPac(*proxy.Url)
if err != nil {
ok := false
if js, ok = c.pacsCache[*proxy.Url]; ok {
logInfo("[-] Error: unable to download or use pac, using cached js")
ex, _ = c.pacToExecutor(js)
} else {
logError("[-] Error: %v", err)
}
}
if js == "" {
noneJs := fmt.Sprintf(`function FindProxyForURL() { return "%s"; }`, c.conf.pacProxy)
proxy.pacJs = &noneJs
proxy.pacRuntime = nil
c.needFastReload = true
continue
}
proxy.pacJs = &js
proxy.pacRuntime = ex
c.pacsCache[*proxy.Url] = js
//
for _, cred := range c.splitCredentials(proxy.Credentials) {
c.conf.Credentials[cred].isUsed = true
}
}
}
return nil
}
func (c *Config) downloadPac(url string) (string, *PacExecutor, error) {
// download pac
httpClient := c.newHttpClient()
get, err := httpClient.Get(url)
if err != nil {
return "", nil, errors.New(fmt.Sprintf("unable to download pac: %v", err))
}
defer func(Body io.ReadCloser) {
_ = Body.Close()
}(get.Body)
// check status code
if get.StatusCode != 200 {
return "", nil, errors.New(fmt.Sprintf("unable to download pac: HTTP %d", get.StatusCode))
}
// read all bytes
jsb, err := io.ReadAll(get.Body)
if err != nil {
return "", nil, errors.New(fmt.Sprintf("unable to download pac: %v", err))
}
js := string(jsb)
executor, err := c.pacToExecutor(js)
if err != nil {
return "", nil, err
}
return js, executor, nil
}
func (c *Config) pacToExecutor(js string) (*PacExecutor, error) {
// load js as unicode/utf-8
executor, err := NewPac(js)
if err != nil {
// load js as iso-latin-1
jsb2, err := charmap.ISO8859_1.NewDecoder().Bytes([]byte(js))
if err == nil {
js = string(jsb2)
executor, err = NewPac(js)
if err != nil {
return nil, stacktrace.Propagate(err, "unable to create pac runtime")
}
}
}
return executor, nil
}
func (c *Config) genProxy(name string, hosts string, port int) string {
list := make([]string, 0)
for _, host := range strings.Split(hosts, ",") {
list = append(list, fmt.Sprintf("%s %s:%d", name, host, port))
}
return strings.Join(list, ";")
}
func (c *Config) genPac() error {
builder := strings.Builder{}
builder.WriteString(`
var FindProxyForURL = function(profiles) {
return function(url, host) {
"use strict";
var index = 0, result = null, direct = null;
do {
result = profiles[index++];
if (typeof result === "function") {
result = result(url, host);
if (result === "CONTINUE") { direct = result; result = null; }
}
} while (typeof result !== "string" && index < profiles.length);
if (result != null) return result;
if (direct != null) return "DIRECT";
return "PROXY 127.0.0.1:1";
}
}([`)
// proxy loop
fn := false
startFn := func() {
builder.WriteString(`
function(url, host) {
"use strict";
`)
fn = true
}
endFn := func() {
builder.WriteString(` return null;
},`)
fn = false
}
for _, rule := range c.conf.Rules {
switch {
case rule.Dns != nil:
case rule.Proxy == nil:
x := ""
if rule.regex.exclude {
x = "!"
}
p := "PROXY 127.0.0.1:1"
if !fn {
startFn()
}
builder.WriteString(fmt.Sprint(" if (", x, "/", rule.regex.regex, `/.test(host)) return "`, p, `";`, "\n"))
case *c.conf.Proxies[rule.firstProxy()].Type == ProxyPac:
x := ""
if !rule.regex.exclude { // inverse exclude as if condition is true then return null
x = "!"
}
proxy := c.conf.Proxies[rule.firstProxy()]
if fn {
endFn()
}
builder.WriteString(`
function(url, host) {
`)
builder.WriteString(fmt.Sprint(" if (", x, "/", rule.regex.regex, `/.test(host)) return null;`))
builder.WriteString(fmt.Sprintf(`
var f = function() {
/* Begin of PAC */
%s
/* End of PAC */
return FindProxyForURL;
}.call(this);
var r = f(url, host).trim();
if (r === "DIRECT") return "CONTINUE";
var firstProxy = r.split(";")[0].trim();
var split = firstProxy.split(" ");
var type = split[0];
var hostPort = "";
if (split.length > 1) hostPort = split.slice(1).join(" ").trim();
var hostOnly = hostPort.split(":")[0];
`, *proxy.pacJs))
for _, confProxy := range c.conf.Proxies {
//if confProxy.Host != nil {
// hp := *confProxy.Host + ":" + strconv.Itoa(confProxy.Port)
// p := c.conf.pacProxy
// if confProxy.pacProxy != nil {
// p = *confProxy.pacProxy
// }
// builder.WriteString(fmt.Sprint(` if (hostPort === "`, hp, `") return "`, p, `";`, "\n"))
//}
if confProxy.pacRegex != nil {
p := c.conf.pacProxy
if confProxy.pacProxy != nil {
p = *confProxy.pacProxy
}
if strings.Contains(confProxy.pacRegex.regex, ":") {
builder.WriteString(fmt.Sprint(" if (/", confProxy.pacRegex.regex, `/.test(hostPort)) return "`, p, `";`, "\n"))
} else if confProxy.pacRegex != nil {
builder.WriteString(fmt.Sprint(" if (/", confProxy.pacRegex.regex, `/.test(hostOnly)) return "`, p, `";`, "\n"))
}
}
}
builder.WriteString(` return r;
},`)
default:
x := ""
if rule.regex.exclude {
x = "!"
}
p := ""
for _, n := range rule.allProxiesName() {
proxy := c.conf.Proxies[n]
if proxy.pacProxy != nil {
p = p + ";" + *proxy.pacProxy
}
}
if p == "" {
p = c.conf.pacProxy
} else {
p = p[1:]
}
if !fn {
startFn()
}
builder.WriteString(fmt.Sprint(" if (", x, "/", rule.regex.regex, `/.test(host)) return "`, p, `";`, "\n"))
}
}
// end main function
if fn {
endFn()
}
builder.WriteString(`
null
]);
`)
c.pac = strings.ReplaceAll(builder.String(), "\r", "")
return nil
}
func (c *Config) askCredentials() error {
logFlush()
var err error
for _, cred := range c.conf.Credentials {
if cred.isUsed && !cred.isPerUser && !cred.isNative {
message := fmt.Sprintf("Credential [%s] -", *cred.name)
if cred.isNull {
message = fmt.Sprintf("Proxy [%s] -", strings.SplitN(*cred.name, "-", 2)[1])
}
if cred.Login == nil {
logPrintf("[-] %s Enter login: ", message)
var login string
_, err = fmt.Scanln(&login)
if err != nil {
return stacktrace.NewError("Invalid empty login")
}
cred.Login = &login
c.disableAutoUpdate = true
}
if cred.Password == nil {
logPrintf("[-] %s Enter password for user '%s': ", message, *cred.Login)
pwdBytes, err := gopass.GetPasswdMasked() // looks like password always exists even if error
if err != nil {
return stacktrace.NewError("Invalid empty password")
}
password := string(pwdBytes)
cred.Password = &password
c.disableAutoUpdate = true
}
}
}
return nil
}
func (c *Config) matchHttp(url string, hostPort string) (*ConfRule, []*ConfProxy) {
return c.match(url, hostPort, "http:", &c.conf.Rules)
}
func (c *Config) matchSocks(hostPort string) (*ConfRule, []*ConfProxy) {
return c.match(hostPort, hostPort, "socks:", &c.conf.SocksRules)
}
func (c *Config) match(url string, hostPort string, prefix string, rules *[]*ConfRule) (*ConfRule, []*ConfProxy) {
if hc, ok := c.getCachedHost(prefix + hostPort); ok {
return hc.rule, hc.proxy
}
hostOnly := strings.Split(hostPort, ":")[0]
var direct *ConfRule
for _, rule := range *rules {
match := false
if rule.regex.pattern == nil {
match = true
} else if !c.conf.experimentalHostsCache && strings.Contains(rule.regex.regex, "/") {
match = rule.regex.pattern.MatchString(url) != rule.regex.exclude
} else if strings.Contains(rule.regex.regex, ":") {
match = rule.regex.pattern.MatchString(hostPort) != rule.regex.exclude
} else {
match = rule.regex.pattern.MatchString(hostOnly) != rule.regex.exclude
}
if match {
proxy := c.resolve(url, hostOnly, rule)
if proxy != nil && *proxy[0] != ConfProxyContinue {
c.addCachedHost(prefix+hostPort, rule, proxy)
return rule, proxy
}
direct = rule
}
}
// if last successful rule is a pac rule which returned DIRECT, then return a "direct" proxy
// otherwise, return nil
if direct != nil {
rule := direct
proxy := []*ConfProxy{c.conf.Proxies[ProxyDirect.Name()]}
c.addCachedHost(prefix+hostPort, rule, proxy)
return rule, proxy
}
c.addCachedHost(prefix+hostPort, nil, nil)
return nil, nil
}
func (c *Config) addCachedHost(hostPort string, rule *ConfRule, proxy []*ConfProxy) {
c.hostsCacheMutex.Lock()
defer c.hostsCacheMutex.Unlock()
c.hostsCache[hostPort] = &HostCache{rule, proxy}
}
func (c *Config) getCachedHost(hostPort string) (*HostCache, bool) {
c.hostsCacheMutex.RLock()
defer c.hostsCacheMutex.RUnlock()
if hc, ok := c.hostsCache[hostPort]; ok {
return hc, true
}
return nil, false
}
func (c *Config) resolve(url, host string, rule *ConfRule) []*ConfProxy {
proxy := c.conf.Proxies[rule.firstProxy()]
if proxy == nil {
return nil
}
if *proxy.Type != ProxyPac {
return c.allProxies(rule)
}
pacResult := c.resolvePac(url, host, proxy)
switch {
case pacResult.isDirect:
// return continue to continue scanning rules
// if no more rules then this will be transformed into a DIRECT (see match)
return []*ConfProxy{&ConfProxyContinue}
case pacResult.isSocks, pacResult.isProxy:
// lookup hostPort in existing proxies (host/port and pac), if found use it, otherwise create a new one
var pacProxies []*ConfProxy
for _, confProxy := range c.conf.Proxies {
//if confProxy.Host != nil {
// if *confProxy.Host+":"+strconv.Itoa(confProxy.Port) == pacResult.hostPort {
// return confProxy
// }
//}
if confProxy.pacRegex != nil {
if strings.Contains(confProxy.pacRegex.regex, ":") {
if confProxy.pacRegex.pattern.MatchString(pacResult.hostPort) {
pacProxies = append(pacProxies, confProxy)
}
} else if confProxy.pacRegex != nil {
if confProxy.pacRegex.pattern.MatchString(pacResult.hostOnly) {
pacProxies = append(pacProxies, confProxy)
}
}
}
}
if pacProxies != nil {
return pacProxies
}
// otherwise create a temporary proxy
proxyName := pacResult.proxy
proxyType := ProxyAnonymous
if pacResult.isSocks {
proxyType = ProxySocks
}
host, p := splitHostPort(pacResult.hostPort, "127.0.0.1", "8080", false)
port, _ := strconv.Atoi(p)
return []*ConfProxy{{
name: &proxyName,
Type: &proxyType,
typeValue: ProxySocks.Value(),
Host: &host,
Port: port,
Verbose: rule.Verbose,
}}
}
if pacResult.isDirect {
return []*ConfProxy{&ConfProxyContinue}
}
return []*ConfProxy{proxy}
}
func (c *Config) resolvePac(url, host string, proxy *ConfProxy) *PacResult {
pac := proxy.pacRuntime
if pac == nil {
return &PacResult{
proxy: ProxyNone.Name(),
isDirect: false,
isProxy: false,
isSocks: false,
hostPort: "",
hostOnly: "",
}
}
proxies, _ := pac.Run(url, host)
firstProxy := strings.TrimSpace(strings.Split(strings.TrimSpace(proxies), ";")[0])
split := strings.SplitN(firstProxy+" ", " ", 2)
pType := split[0]
pHostPort := ""
if len(split) > 1 {
pHostPort = strings.TrimSpace(split[1])
}
pHostOnly := strings.Split(pHostPort, ":")[0]
return &PacResult{
proxy: firstProxy,
isDirect: pType == "DIRECT",
isProxy: pType == "PROXY" || pType == "HTTP" || pType == "HTTPS",
isSocks: pType == "SOCKS" || pType == "SOCKS4" || pType == "SOCKS5",
hostPort: pHostPort,
hostOnly: pHostOnly,
}
}
func (c *Config) allProxies(rule *ConfRule) []*ConfProxy {
allProxies := rule.allProxiesName()
proxies := make([]*ConfProxy, len(allProxies))
for i, p := range allProxies {
proxies[i] = c.conf.Proxies[p]
}
return proxies
}
func (c *Config) splitCredentials(creds *string) []string {
if creds != nil && *creds != "" {
c := strings.Split(*creds, " ")
if strings.Contains(*creds, ",") {
c = strings.Split(*creds, ",")
}
return c
}
return nil
}
func (c *Config) regex(rule string) (*ConfRegex, error) {
exclude := false
regex := rule
if strings.HasPrefix(regex, "!") {
regex = regex[1:]
exclude = true
}
if strings.HasPrefix(regex, "re:") {
regex = regex[3:]
} else {
regex = strings.ReplaceAll(regex, ".", `\.`)
regex = strings.ReplaceAll(regex, "*", ".*")
regex = strings.ReplaceAll(regex, "?", ".")
regex = "^" + strings.ReplaceAll(regex, "|", "$|^") + "$"
}
pattern, err := regexp.Compile(regex)
if err != nil {
return nil, stacktrace.Propagate(err, "unable to compile regex")
}
return &ConfRegex{
pattern: pattern,
regex: regex,
exclude: exclude,
}, nil
}
func (c *Config) genCerts() error {
mitm := false
for _, rule := range c.conf.Rules {
if rule.Mitm {
mitm = true
break
}
}
if !mitm {
return nil
}
// read/create CA
caCert := AppName + ".ca.crt"
caKey := AppName + ".ca.key"
ca, err := NewCertFromFiles(caCert, caKey)
if err != nil {
ca, err = NewCert(NewBasicCACertConfig("kpx ca - "+uuid.NewString(), time.Now().UnixMicro()), 2048, nil)
if err != nil {
return fmt.Errorf("unable to generate CA certificate: %v", err)
}
err = ca.SaveToFiles(caCert, caKey)
if err != nil {
return fmt.Errorf("unable to save CA certificate: %v", err)
}
}
cm, err := NewCertsManager(ca, "kpx:", []string{"**"})
if err != nil {
return fmt.Errorf("unable to create certificates manager: %v", err)
}
c.certsManager = cm
return nil
}
type ProxyType string
const (
ProxyKerberos ProxyType = "kerberos"
ProxySocks ProxyType = "socks"
ProxyAnonymous ProxyType = "anonymous"
ProxyDirect ProxyType = "direct"
ProxyBasic ProxyType = "basic"
ProxyNone ProxyType = "none"
ProxyPac ProxyType = "pac"
)
var ConfProxyContinue = ConfProxy{}
func (pt ProxyType) Name() string {
return string(pt)
}
func (pt ProxyType) Value() int {
switch pt {
case ProxyKerberos:
return 0
case ProxySocks:
return 1
case ProxyAnonymous:
return 2
case ProxyDirect:
return 3
case ProxyBasic:
return 4
case ProxyNone:
return 5
case ProxyPac:
return 6
}
return -1
}
type Conf struct {
Bind string
Port int
SocksPort int `yaml:"socksPort"`
Verbose bool
Debug bool
Trace bool
Proxies map[string]*ConfProxy
Credentials map[string]*ConfCred
Domains map[string]*string
Rules []*ConfRule
SocksRules []*ConfRule `yaml:"socksRules"`
pacProxy string
Krb5 string
ConnectTimeout int `yaml:"connectTimeout"`
IdleTimeout int `yaml:"idleTimeout"`
CloseTimeout int `yaml:"closeTimeout"`
Check *bool
Update bool
Restart bool
UseEnvProxy bool
Experimental string // space/comma separated list of features