Begin refactor + selective auth
This commit is contained in:
Thom Seddon
225
main.go
225
main.go
@ -2,237 +2,38 @@ package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/namsral/flag"
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"github.com/sirupsen/logrus"
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)
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// Vars
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var fw *ForwardAuth
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var log logrus.FieldLogger
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// Primary handler
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func handler(w http.ResponseWriter, r *http.Request) {
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// Logging setup
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logger := log.WithFields(logrus.Fields{
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"RemoteAddr": r.RemoteAddr,
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})
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logger.WithFields(logrus.Fields{
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"Headers": r.Header,
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}).Debugf("Handling request")
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// Parse uri
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uri, err := url.Parse(r.Header.Get("X-Forwarded-Uri"))
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if err != nil {
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logger.Errorf("Error parsing X-Forwarded-Uri, %v", err)
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http.Error(w, "Service unavailable", 503)
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return
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}
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// Handle callback
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if uri.Path == fw.Path {
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logger.Debugf("Passing request to auth callback")
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handleCallback(w, r, uri.Query(), logger)
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return
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}
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// Get auth cookie
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c, err := r.Cookie(fw.CookieName)
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if err != nil {
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// Error indicates no cookie, generate nonce
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err, nonce := fw.Nonce()
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if err != nil {
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logger.Errorf("Error generating nonce, %v", err)
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http.Error(w, "Service unavailable", 503)
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return
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}
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// Set the CSRF cookie
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http.SetCookie(w, fw.MakeCSRFCookie(r, nonce))
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logger.Debug("Set CSRF cookie and redirecting to google login")
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// Forward them on
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http.Redirect(w, r, fw.GetLoginURL(r, nonce), http.StatusTemporaryRedirect)
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return
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}
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// Validate cookie
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valid, email, err := fw.ValidateCookie(r, c)
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if !valid {
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logger.Errorf("Invalid cookie: %v", err)
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http.Error(w, "Not authorized", 401)
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return
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}
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// Validate user
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valid = fw.ValidateEmail(email)
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if !valid {
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logger.WithFields(logrus.Fields{
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"email": email,
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}).Errorf("Invalid email")
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http.Error(w, "Not authorized", 401)
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return
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}
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// Valid request
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logger.Debugf("Allowing valid request ")
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w.Header().Set("X-Forwarded-User", email)
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w.WriteHeader(200)
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}
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// Authenticate user after they have come back from google
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func handleCallback(w http.ResponseWriter, r *http.Request, qs url.Values,
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logger logrus.FieldLogger) {
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// Check for CSRF cookie
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csrfCookie, err := r.Cookie(fw.CSRFCookieName)
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if err != nil {
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logger.Warn("Missing csrf cookie")
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http.Error(w, "Not authorized", 401)
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return
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}
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// Validate state
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state := qs.Get("state")
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valid, redirect, err := fw.ValidateCSRFCookie(csrfCookie, state)
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if !valid {
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logger.WithFields(logrus.Fields{
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"csrf": csrfCookie.Value,
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"state": state,
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}).Warnf("Error validating csrf cookie: %v", err)
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http.Error(w, "Not authorized", 401)
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return
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}
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// Clear CSRF cookie
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http.SetCookie(w, fw.ClearCSRFCookie(r))
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// Exchange code for token
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token, err := fw.ExchangeCode(r, qs.Get("code"))
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if err != nil {
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logger.Errorf("Code exchange failed with: %v", err)
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http.Error(w, "Service unavailable", 503)
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return
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}
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// Get user
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user, err := fw.GetUser(token)
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if err != nil {
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logger.Errorf("Error getting user: %s", err)
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return
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}
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// Generate cookie
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http.SetCookie(w, fw.MakeCookie(r, user.Email))
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logger.WithFields(logrus.Fields{
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"user": user.Email,
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}).Infof("Generated auth cookie")
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// Redirect
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http.Redirect(w, r, redirect, http.StatusTemporaryRedirect)
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}
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var config *Config
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// Main
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func main() {
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// Parse options
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flag.String(flag.DefaultConfigFlagname, "", "Path to config file")
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path := flag.String("url-path", "_oauth", "Callback URL")
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lifetime := flag.Int("lifetime", 43200, "Session length in seconds")
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secret := flag.String("secret", "", "*Secret used for signing (required)")
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authHost := flag.String("auth-host", "", "Central auth login")
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clientId := flag.String("client-id", "", "*Google Client ID (required)")
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clientSecret := flag.String("client-secret", "", "*Google Client Secret (required)")
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cookieName := flag.String("cookie-name", "_forward_auth", "Cookie Name")
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cSRFCookieName := flag.String("csrf-cookie-name", "_forward_auth_csrf", "CSRF Cookie Name")
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cookieDomainList := flag.String("cookie-domains", "", "Comma separated list of cookie domains") //todo
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cookieSecret := flag.String("cookie-secret", "", "Deprecated")
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cookieSecure := flag.Bool("cookie-secure", true, "Use secure cookies")
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domainList := flag.String("domain", "", "Comma separated list of email domains to allow")
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emailWhitelist := flag.String("whitelist", "", "Comma separated list of emails to allow")
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prompt := flag.String("prompt", "", "Space separated list of OpenID prompt options")
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logLevel := flag.String("log-level", "warn", "Log level: trace, debug, info, warn, error, fatal, panic")
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logFormat := flag.String("log-format", "text", "Log format: text, json, pretty")
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flag.Parse()
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// Parse config
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config = NewParsedConfig()
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// Setup logger
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log = CreateLogger(*logLevel, *logFormat)
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log = NewLogger()
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// Backwards compatibility
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if *secret == "" && *cookieSecret != "" {
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*secret = *cookieSecret
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}
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// Perform config checks
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config.Checks()
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// Check for show stopper errors
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if *clientId == "" || *clientSecret == "" || *secret == "" {
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log.Fatal("client-id, client-secret and secret must all be set")
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}
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// Build forward auth handler
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fw = NewForwardAuth()
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// Parse lists
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var cookieDomains []CookieDomain
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if *cookieDomainList != "" {
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for _, d := range strings.Split(*cookieDomainList, ",") {
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cookieDomain := NewCookieDomain(d)
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cookieDomains = append(cookieDomains, *cookieDomain)
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}
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}
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// Build server
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server := NewServer()
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var domain []string
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if *domainList != "" {
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domain = strings.Split(*domainList, ",")
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}
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var whitelist []string
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if *emailWhitelist != "" {
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whitelist = strings.Split(*emailWhitelist, ",")
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}
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// Setup
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fw = &ForwardAuth{
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Path: fmt.Sprintf("/%s", *path),
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Lifetime: time.Second * time.Duration(*lifetime),
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Secret: []byte(*secret),
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AuthHost: *authHost,
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ClientId: *clientId,
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ClientSecret: *clientSecret,
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Scope: "https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email",
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LoginURL: &url.URL{
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Scheme: "https",
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Host: "accounts.google.com",
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Path: "/o/oauth2/auth",
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},
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TokenURL: &url.URL{
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Scheme: "https",
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Host: "www.googleapis.com",
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Path: "/oauth2/v3/token",
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},
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UserURL: &url.URL{
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Scheme: "https",
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Host: "www.googleapis.com",
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Path: "/oauth2/v2/userinfo",
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},
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CookieName: *cookieName,
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CSRFCookieName: *cSRFCookieName,
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CookieDomains: cookieDomains,
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CookieSecure: *cookieSecure,
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Domain: domain,
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Whitelist: whitelist,
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Prompt: *prompt,
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}
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// Attach handler
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http.HandleFunc("/", handler)
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// Attach router to default server
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http.HandleFunc("/", server.RootHandler)
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// Start
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jsonConf, _ := json.Marshal(fw)
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jsonConf, _ := json.Marshal(config)
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log.Debugf("Starting with options: %s", string(jsonConf))
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log.Info("Listening on :4181")
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log.Info(http.ListenAndServe(":4181", nil))
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