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webhook_sentry.go
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package main
import (
_ "embed"
"fmt"
"github.com/juggernaut/webhook-sentry/proxy"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"log"
"net"
"strings"
"sync"
"time"
)
//go:embed banner.txt
var banner string
var (
cfgFile string
rootCmd = &cobra.Command{
Use: "webhook-sentry",
Short: "An egress proxy for sending webhooks securely",
Run: func(cmd *cobra.Command, args []string) {
execute()
},
}
)
func main() {
rootCmd.Execute()
}
func init() {
cobra.OnInitialize(initConfig)
rootCmd.Flags().StringVar(&cfgFile, "config", "", "Path to config file")
rootCmd.Flags().String("listener-address", ":9090", "Address to listen on")
rootCmd.Flags().String("listener-type", "http", "Type of listener (http or https)")
rootCmd.Flags().String("listener-cert-file", "", "Path to certificate file (required only if listener is https)")
rootCmd.Flags().String("listener-key-file", "", "Path to key file (required only if listener is https)")
rootCmd.Flags().Duration("connect-timeout", time.Second*10, "TCP connect timeout")
rootCmd.Flags().Duration("connection-lifetime", time.Second*60, "TCP connection lifetime")
rootCmd.Flags().Duration("read-timeout", time.Second*10, "TCP connection read timeout")
rootCmd.Flags().Bool("insecure-skip-cert-verification", false, "Skip target certificate verification (WARNING: not for production use!)")
rootCmd.Flags().Bool("insecure-skip-cidr-deny-list", false, "Skip checking CIDR deny list (WARNING: not for production use!)")
rootCmd.Flags().Uint32("max-response-body-size", 1048576, "Maximum response body size (in bytes) over which the connection is automatically shut down")
rootCmd.Flags().String("access-log-type", "text", "Type of access log (text or json)")
rootCmd.Flags().String("access-log-file", "", "Path to access log file (default goes to stdout)")
rootCmd.Flags().String("proxy-log-type", "text", "Type of proxy log (text or json)")
rootCmd.Flags().String("proxy-log-file", "", "Path to proxy log file (default goes to stdout)")
rootCmd.Flags().String("metrics-address", ":2112", "Address to expose prometheus metrics on")
rootCmd.Flags().StringSlice("cidr-deny-list", nil, "List of CIDRs to be blocked (see docs for default)")
viper.BindPFlag("listener.address", rootCmd.Flags().Lookup("listener-address"))
viper.BindPFlag("listener.type", rootCmd.Flags().Lookup("listener-type"))
viper.BindPFlag("listener.certFile", rootCmd.Flags().Lookup("listener-cert-file"))
viper.BindPFlag("listener.keyFile", rootCmd.Flags().Lookup("listener-key-file"))
viper.BindPFlag("connectTimeout", rootCmd.Flags().Lookup("connect-timeout"))
viper.BindPFlag("connectionLifetime", rootCmd.Flags().Lookup("connection-lifetime"))
viper.BindPFlag("readTimeout", rootCmd.Flags().Lookup("read-timeout"))
viper.BindPFlag("insecureSkipCertVerification", rootCmd.Flags().Lookup("insecure-skip-cert-verification"))
viper.BindPFlag("insecureSkipCidrDenyList", rootCmd.Flags().Lookup("insecure-skip-cidr-deny-list"))
viper.BindPFlag("maxResponseBodySize", rootCmd.Flags().Lookup("max-response-body-size"))
viper.BindPFlag("accessLog.type", rootCmd.Flags().Lookup("access-log-type"))
viper.BindPFlag("accessLog.file", rootCmd.Flags().Lookup("access-log-file"))
viper.BindPFlag("proxyLog.type", rootCmd.Flags().Lookup("proxy-log-type"))
viper.BindPFlag("proxyLog.file", rootCmd.Flags().Lookup("proxy-log-file"))
viper.BindPFlag("metrics.address", rootCmd.Flags().Lookup("metrics-address"))
viper.BindPFlag("cidrDenyList", rootCmd.Flags().Lookup("cidr-deny-list"))
viper.SetDefault("cidrDenyList", []string{
"127.0.0.0/8",
"10.0.0.0/8",
"0.0.0.0/8",
"100.64.0.0/10",
"169.254.0.0/16",
"172.16.0.0/12",
"192.0.0.0/24",
"192.168.0.0/16",
"224.0.0.0/4",
"240.0.0.0/4",
})
viper.SetDefault("listener.address", ":9090")
viper.SetDefault("listener.type", "http")
viper.SetDefault("connectTimeout", "10s")
viper.SetDefault("connectionLifetime", "60s")
viper.SetDefault("readTimeout", "10s")
viper.SetDefault("insecureSkipCertVerification", false)
viper.SetDefault("insecureSkipCidrDenyList", false)
viper.SetDefault("maxResponseBodySize", 1048576)
viper.SetDefault("accessLog.type", "text")
viper.SetDefault("proxyLog.type", "text")
viper.SetDefault("metrics.address", ":2112")
viper.SetDefault("requestIDHeader", "Request-ID")
viper.AutomaticEnv()
viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
}
func initConfig() {
if cfgFile != "" {
viper.SetConfigFile(cfgFile)
} else {
viper.SetConfigName("config")
viper.SetConfigType("yaml")
viper.AddConfigPath(".")
}
if err := viper.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok {
// Config file not found; rely on defaults only
} else {
// Config file was found but another error was produced
panic(err)
}
}
}
func execute() {
var cidrs []proxy.Cidr
for _, c := range viper.GetStringSlice("cidrDenyList") {
cidrs = append(cidrs, validCidr(c))
}
config := &proxy.ProxyConfig{
CidrDenyList: cidrs,
Listeners: []proxy.ListenerConfig{{
Address: viper.GetString("listener.address"),
Type: validProtocol(viper.GetString("listener.type")),
CertFile: viper.GetString("listener.certFile"),
KeyFile: viper.GetString("listener.keyFile"),
}},
ConnectTimeout: viper.GetDuration("connectTimeout"),
ConnectionLifetime: viper.GetDuration("connectionLifetime"),
ReadTimeout: viper.GetDuration("readTimeout"),
MaxResponseBodySize: viper.GetUint32("maxResponseBodySize"),
InsecureSkipCertVerification: viper.GetBool("insecureSkipCertVerification"),
InsecureSkipCidrDenyList: viper.GetBool("insecureSkipCidrDenyList"),
ClientCertFile: viper.GetString("clientCertFile"),
ClientKeyFile: viper.GetString("clientKeyFile"),
MitmIssuerCertFile: viper.GetString("mitmIssuerCertFile"),
MitmIssuerKeyFile: viper.GetString("mitmIssuerKeyFile"),
AccessLog: logConfig("accessLog"),
ProxyLog: logConfig("proxyLog"),
MetricsAddress: viper.GetString("metrics.address"),
RequestIDHeader: viper.GetString("requestIDHeader"),
}
if err := config.Validate(); err != nil {
panic(err)
}
if err := proxy.InitConfig(config); err != nil {
panic(err)
}
if err := proxy.SetupLogging(config); err != nil {
log.Fatalf("Failed to configure logging: %s\n", err)
}
proxy.SetupMetrics(config.MetricsAddress)
fmt.Print(banner)
proxyServers := proxy.CreateProxyServers(config)
wg := &sync.WaitGroup{}
for i, proxyServer := range proxyServers {
wg.Add(1)
listenerConfig := config.Listeners[i]
if listenerConfig.Type == proxy.HTTP {
proxy.StartHTTPServer(listenerConfig.Address, proxyServer, wg)
} else {
proxy.StartTLSServer(listenerConfig.Address, listenerConfig.CertFile, listenerConfig.KeyFile, proxyServer, wg)
}
}
wg.Wait()
}
func validProtocol(proto string) proxy.Protocol {
p := proxy.Protocol(proto)
if p != proxy.HTTP && p != proxy.HTTPS {
panic("Invalid protocol " + proto)
}
return p
}
func validLogType(logType string) proxy.LogType {
l := proxy.LogType(logType)
if l != proxy.Text && l != proxy.JSON {
panic("Invalid log type " + logType)
}
return l
}
func logConfig(key string) proxy.LogConfig {
return proxy.LogConfig{
File: viper.GetString(key + ".file"),
Type: validLogType(viper.GetString(key + ".type")),
}
}
func validCidr(cidr string) proxy.Cidr {
_, ipNet, err := net.ParseCIDR(cidr)
if err != nil {
panic("Invalid CIDR " + cidr)
}
return proxy.Cidr(*ipNet)
}