outpost: rename proxy to outpost
This commit is contained in:
Jens Langhammer
30
outpost/pkg/proxy/claims.go
Normal file
30
outpost/pkg/proxy/claims.go
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@ -0,0 +1,30 @@
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package proxy
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import (
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"encoding/base64"
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"encoding/json"
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"strings"
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)
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type Claims struct {
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Proxy struct {
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UserAttributes map[string]interface{} `json:"user_attributes"`
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} `json:"ak_proxy"`
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}
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func (c *Claims) FromIDToken(idToken string) error {
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// id_token is a base64 encode ID token payload
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// https://developers.google.com/accounts/docs/OAuth2Login#obtainuserinfo
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jwt := strings.Split(idToken, ".")
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jwtData := strings.TrimSuffix(jwt[1], "=")
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b, err := base64.RawURLEncoding.DecodeString(jwtData)
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if err != nil {
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return err
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}
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err = json.Unmarshal(b, c)
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if err != nil {
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return err
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}
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return nil
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}
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69
outpost/pkg/proxy/cookies.go
Normal file
69
outpost/pkg/proxy/cookies.go
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@ -0,0 +1,69 @@
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package proxy
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import (
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"net"
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"net/http"
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"strings"
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"time"
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sessionsapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/cookies"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/util"
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)
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// MakeCSRFCookie creates a cookie for CSRF
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func (p *OAuthProxy) MakeCSRFCookie(req *http.Request, value string, expiration time.Duration, now time.Time) *http.Cookie {
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return p.makeCookie(req, p.CSRFCookieName, value, expiration, now)
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}
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func (p *OAuthProxy) makeCookie(req *http.Request, name string, value string, expiration time.Duration, now time.Time) *http.Cookie {
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cookieDomain := cookies.GetCookieDomain(req, p.CookieDomains)
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if cookieDomain != "" {
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domain := util.GetRequestHost(req)
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if h, _, err := net.SplitHostPort(domain); err == nil {
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domain = h
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}
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if !strings.HasSuffix(domain, cookieDomain) {
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p.logger.Errorf("Warning: request host is %q but using configured cookie domain of %q", domain, cookieDomain)
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}
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}
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return &http.Cookie{
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Name: name,
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Value: value,
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Path: p.CookiePath,
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Domain: cookieDomain,
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HttpOnly: p.CookieHTTPOnly,
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Secure: p.CookieSecure,
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Expires: now.Add(expiration),
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SameSite: cookies.ParseSameSite(p.CookieSameSite),
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}
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}
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// ClearCSRFCookie creates a cookie to unset the CSRF cookie stored in the user's
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// session
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func (p *OAuthProxy) ClearCSRFCookie(rw http.ResponseWriter, req *http.Request) {
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http.SetCookie(rw, p.MakeCSRFCookie(req, "", time.Hour*-1, time.Now()))
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}
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// SetCSRFCookie adds a CSRF cookie to the response
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func (p *OAuthProxy) SetCSRFCookie(rw http.ResponseWriter, req *http.Request, val string) {
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http.SetCookie(rw, p.MakeCSRFCookie(req, val, p.CookieExpire, time.Now()))
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}
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// ClearSessionCookie creates a cookie to unset the user's authentication cookie
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// stored in the user's session
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func (p *OAuthProxy) ClearSessionCookie(rw http.ResponseWriter, req *http.Request) error {
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return p.sessionStore.Clear(rw, req)
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}
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// LoadCookiedSession reads the user's authentication details from the request
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func (p *OAuthProxy) LoadCookiedSession(req *http.Request) (*sessionsapi.SessionState, error) {
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return p.sessionStore.Load(req)
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}
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// SaveSession creates a new session cookie value and sets this on the response
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func (p *OAuthProxy) SaveSession(rw http.ResponseWriter, req *http.Request, s *sessionsapi.SessionState) error {
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return p.sessionStore.Save(rw, req, s)
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}
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233
outpost/pkg/proxy/oauth.go
Normal file
233
outpost/pkg/proxy/oauth.go
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@ -0,0 +1,233 @@
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package proxy
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import (
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"context"
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"errors"
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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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sessionsapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/encryption"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/ip"
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)
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// GetRedirectURI returns the redirectURL that the upstream OAuth Provider will
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// redirect clients to once authenticated
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func (p *OAuthProxy) GetRedirectURI(host string) string {
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// default to the request Host if not set
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if p.redirectURL.Host != "" {
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return p.redirectURL.String()
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}
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u := *p.redirectURL
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if u.Scheme == "" {
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if p.CookieSecure {
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u.Scheme = httpsScheme
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} else {
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u.Scheme = httpScheme
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}
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}
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u.Host = host
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return u.String()
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}
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func (p *OAuthProxy) redeemCode(ctx context.Context, host, code string) (s *sessionsapi.SessionState, err error) {
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if code == "" {
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return nil, errors.New("missing code")
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}
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redirectURI := p.GetRedirectURI(host)
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s, err = p.provider.Redeem(ctx, redirectURI, code)
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if err != nil {
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return
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}
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if s.Email == "" {
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s.Email, err = p.provider.GetEmailAddress(ctx, s)
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}
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if s.PreferredUsername == "" {
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s.PreferredUsername, err = p.provider.GetPreferredUsername(ctx, s)
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if err != nil && err.Error() == "not implemented" {
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err = nil
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}
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}
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if s.User == "" {
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s.User, err = p.provider.GetUserName(ctx, s)
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if err != nil && err.Error() == "not implemented" {
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err = nil
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}
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}
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return
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}
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// GetRedirect reads the query parameter to get the URL to redirect clients to
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// once authenticated with the OAuthProxy
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func (p *OAuthProxy) GetRedirect(req *http.Request) (redirect string, err error) {
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err = req.ParseForm()
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if err != nil {
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return
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}
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redirect = req.Header.Get("X-Auth-Request-Redirect")
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if req.Form.Get("rd") != "" {
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redirect = req.Form.Get("rd")
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}
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if !p.IsValidRedirect(redirect) {
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// Use RequestURI to preserve ?query
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redirect = req.URL.RequestURI()
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if strings.HasPrefix(redirect, p.ProxyPrefix) {
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redirect = "/"
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}
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}
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return
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}
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// IsValidRedirect checks whether the redirect URL is whitelisted
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func (p *OAuthProxy) IsValidRedirect(redirect string) bool {
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switch {
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case redirect == "":
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// The user didn't specify a redirect, should fallback to `/`
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return false
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case strings.HasPrefix(redirect, "/") && !strings.HasPrefix(redirect, "//") && !invalidRedirectRegex.MatchString(redirect):
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return true
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case strings.HasPrefix(redirect, "http://") || strings.HasPrefix(redirect, "https://"):
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redirectURL, err := url.Parse(redirect)
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if err != nil {
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p.logger.Printf("Rejecting invalid redirect %q: scheme unsupported or missing", redirect)
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return false
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}
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redirectHostname := redirectURL.Hostname()
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for _, domain := range p.whitelistDomains {
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domainHostname, domainPort := splitHostPort(strings.TrimLeft(domain, "."))
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if domainHostname == "" {
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continue
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}
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if (redirectHostname == domainHostname) || (strings.HasPrefix(domain, ".") && strings.HasSuffix(redirectHostname, domainHostname)) {
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// the domain names match, now validate the ports
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// if the whitelisted domain's port is '*', allow all ports
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// if the whitelisted domain contains a specific port, only allow that port
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// if the whitelisted domain doesn't contain a port at all, only allow empty redirect ports ie http and https
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redirectPort := redirectURL.Port()
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if (domainPort == "*") ||
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(domainPort == redirectPort) ||
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(domainPort == "" && redirectPort == "") {
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return true
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}
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}
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}
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p.logger.Printf("Rejecting invalid redirect %q: domain / port not in whitelist", redirect)
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return false
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default:
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p.logger.Printf("Rejecting invalid redirect %q: not an absolute or relative URL", redirect)
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return false
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}
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}
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// IsWhitelistedRequest is used to check if auth should be skipped for this request
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func (p *OAuthProxy) IsWhitelistedRequest(req *http.Request) bool {
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isPreflightRequestAllowed := p.skipAuthPreflight && req.Method == "OPTIONS"
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return isPreflightRequestAllowed || p.IsWhitelistedPath(req.URL.Path)
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}
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// IsWhitelistedPath is used to check if the request path is allowed without auth
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func (p *OAuthProxy) IsWhitelistedPath(path string) bool {
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for _, u := range p.compiledRegex {
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if u.MatchString(path) {
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return true
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}
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}
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return false
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}
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// OAuthStart starts the OAuth2 authentication flow
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func (p *OAuthProxy) OAuthStart(rw http.ResponseWriter, req *http.Request) {
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prepareNoCache(rw)
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nonce, err := encryption.Nonce()
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if err != nil {
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p.logger.Errorf("Error obtaining nonce: %v", err)
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
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return
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}
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p.SetCSRFCookie(rw, req, nonce)
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redirect, err := p.GetRedirect(req)
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if err != nil {
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p.logger.Errorf("Error obtaining redirect: %v", err)
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
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return
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}
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redirectURI := p.GetRedirectURI(req.Host)
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http.Redirect(rw, req, p.provider.GetLoginURL(redirectURI, fmt.Sprintf("%v:%v", nonce, redirect)), http.StatusFound)
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}
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// OAuthCallback is the OAuth2 authentication flow callback that finishes the
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// OAuth2 authentication flow
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func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
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remoteAddr := ip.GetClientString(p.realClientIPParser, req, true)
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// finish the oauth cycle
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err := req.ParseForm()
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if err != nil {
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p.logger.Errorf("Error while parsing OAuth2 callback: %v", err)
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
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return
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}
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errorString := req.Form.Get("error")
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if errorString != "" {
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p.logger.Errorf("Error while parsing OAuth2 callback: %s", errorString)
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p.ErrorPage(rw, http.StatusForbidden, "Permission Denied", errorString)
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return
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}
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session, err := p.redeemCode(req.Context(), req.Host, req.Form.Get("code"))
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if err != nil {
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p.logger.Errorf("Error redeeming code during OAuth2 callback: %v", err)
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", "Internal Error")
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return
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}
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s := strings.SplitN(req.Form.Get("state"), ":", 2)
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if len(s) != 2 {
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p.logger.Error("Error while parsing OAuth2 state: invalid length")
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", "Invalid State")
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return
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}
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nonce := s[0]
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redirect := s[1]
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c, err := req.Cookie(p.CSRFCookieName)
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if err != nil {
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p.logger.WithField("user", session.Email).WithField("status", "AuthFailure").Info("Invalid authentication via OAuth2: unable to obtain CSRF cookie")
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p.ErrorPage(rw, http.StatusForbidden, "Permission Denied", err.Error())
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return
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}
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p.ClearCSRFCookie(rw, req)
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if c.Value != nonce {
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p.logger.WithField("user", session.Email).WithField("status", "AuthFailure").Info("Invalid authentication via OAuth2: CSRF token mismatch, potential attack")
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p.ErrorPage(rw, http.StatusForbidden, "Permission Denied", "CSRF Failed")
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return
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}
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if !p.IsValidRedirect(redirect) {
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redirect = "/"
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}
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// set cookie, or deny
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if p.provider.ValidateGroup(session.Email) {
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p.logger.WithField("user", session.Email).WithField("status", "AuthFailure").Infof("Authenticated via OAuth2: %s", session)
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err := p.SaveSession(rw, req, session)
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if err != nil {
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p.logger.Printf("Error saving session state for %s: %v", remoteAddr, err)
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p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
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return
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}
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http.Redirect(rw, req, redirect, http.StatusFound)
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} else {
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p.logger.WithField("user", session.Email).WithField("status", "AuthFailure").Info("Invalid authentication via OAuth2: unauthorized")
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p.ErrorPage(rw, http.StatusForbidden, "Permission Denied", "Invalid Account")
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}
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}
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481
outpost/pkg/proxy/proxy.go
Normal file
481
outpost/pkg/proxy/proxy.go
Normal file
@ -0,0 +1,481 @@
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package proxy
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import (
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b64 "encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"html/template"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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"time"
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"github.com/coreos/go-oidc"
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"github.com/justinas/alice"
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ipapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/ip"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
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sessionsapi "github.com/oauth2-proxy/oauth2-proxy/pkg/apis/sessions"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/middleware"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/sessions"
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"github.com/oauth2-proxy/oauth2-proxy/pkg/upstream"
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"github.com/oauth2-proxy/oauth2-proxy/providers"
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log "github.com/sirupsen/logrus"
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)
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const (
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httpScheme = "http"
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httpsScheme = "https"
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applicationJSON = "application/json"
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)
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var (
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// ErrNeedsLogin means the user should be redirected to the login page
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ErrNeedsLogin = errors.New("redirect to login page")
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// Used to check final redirects are not susceptible to open redirects.
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// Matches //, /\ and both of these with whitespace in between (eg / / or / \).
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invalidRedirectRegex = regexp.MustCompile(`[/\\](?:[\s\v]*|\.{1,2})[/\\]`)
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)
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// OAuthProxy is the main authentication proxy
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type OAuthProxy struct {
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CookieSeed string
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CookieName string
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CSRFCookieName string
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CookieDomains []string
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CookiePath string
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CookieSecure bool
|
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CookieHTTPOnly bool
|
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CookieExpire time.Duration
|
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CookieRefresh time.Duration
|
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CookieSameSite string
|
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|
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RobotsPath string
|
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SignInPath string
|
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SignOutPath string
|
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OAuthStartPath string
|
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OAuthCallbackPath string
|
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AuthOnlyPath string
|
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UserInfoPath string
|
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|
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redirectURL *url.URL // the url to receive requests at
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whitelistDomains []string
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provider providers.Provider
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sessionStore sessionsapi.SessionStore
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ProxyPrefix string
|
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serveMux http.Handler
|
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SetXAuthRequest bool
|
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SetBasicAuth bool
|
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PassUserHeaders bool
|
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BasicAuthUserAttribute string
|
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BasicAuthPasswordAttribute string
|
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PassAccessToken bool
|
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SetAuthorization bool
|
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PassAuthorization bool
|
||||
PreferEmailToUser bool
|
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skipAuthRegex []string
|
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skipAuthPreflight bool
|
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skipAuthStripHeaders bool
|
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mainJwtBearerVerifier *oidc.IDTokenVerifier
|
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extraJwtBearerVerifiers []*oidc.IDTokenVerifier
|
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compiledRegex []*regexp.Regexp
|
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templates *template.Template
|
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realClientIPParser ipapi.RealClientIPParser
|
||||
|
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sessionChain alice.Chain
|
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|
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logger *log.Entry
|
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}
|
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|
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// NewOAuthProxy creates a new instance of OAuthProxy from the options provided
|
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func NewOAuthProxy(opts *options.Options) (*OAuthProxy, error) {
|
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logger := log.WithField("component", "proxy").WithField("client-id", opts.ClientID)
|
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sessionStore, err := sessions.NewSessionStore(&opts.Session, &opts.Cookie)
|
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if err != nil {
|
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return nil, fmt.Errorf("error initialising session store: %v", err)
|
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}
|
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|
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templates := getTemplates()
|
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proxyErrorHandler := upstream.NewProxyErrorHandler(templates.Lookup("error.html"), opts.ProxyPrefix)
|
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upstreamProxy, err := upstream.NewProxy(opts.UpstreamServers, opts.GetSignatureData(), proxyErrorHandler)
|
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if err != nil {
|
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return nil, fmt.Errorf("error initialising upstream proxy: %v", err)
|
||||
}
|
||||
|
||||
for _, u := range opts.GetCompiledRegex() {
|
||||
logger.Printf("compiled skip-auth-regex => %q", u)
|
||||
}
|
||||
|
||||
redirectURL := opts.GetRedirectURL()
|
||||
if redirectURL.Path == "" {
|
||||
redirectURL.Path = fmt.Sprintf("%s/callback", opts.ProxyPrefix)
|
||||
}
|
||||
|
||||
logger.Printf("proxy instance configured for Client ID: %s", opts.ClientID)
|
||||
|
||||
sessionChain := buildSessionChain(opts, sessionStore)
|
||||
|
||||
return &OAuthProxy{
|
||||
CookieName: opts.Cookie.Name,
|
||||
CSRFCookieName: fmt.Sprintf("%v_%v", opts.Cookie.Name, "csrf"),
|
||||
CookieSeed: opts.Cookie.Secret,
|
||||
CookieDomains: opts.Cookie.Domains,
|
||||
CookiePath: opts.Cookie.Path,
|
||||
CookieSecure: opts.Cookie.Secure,
|
||||
CookieHTTPOnly: opts.Cookie.HTTPOnly,
|
||||
CookieExpire: opts.Cookie.Expire,
|
||||
CookieRefresh: opts.Cookie.Refresh,
|
||||
CookieSameSite: opts.Cookie.SameSite,
|
||||
|
||||
RobotsPath: "/robots.txt",
|
||||
SignInPath: fmt.Sprintf("%s/sign_in", opts.ProxyPrefix),
|
||||
SignOutPath: fmt.Sprintf("%s/sign_out", opts.ProxyPrefix),
|
||||
OAuthStartPath: fmt.Sprintf("%s/start", opts.ProxyPrefix),
|
||||
OAuthCallbackPath: fmt.Sprintf("%s/callback", opts.ProxyPrefix),
|
||||
AuthOnlyPath: fmt.Sprintf("%s/auth", opts.ProxyPrefix),
|
||||
UserInfoPath: fmt.Sprintf("%s/userinfo", opts.ProxyPrefix),
|
||||
|
||||
ProxyPrefix: opts.ProxyPrefix,
|
||||
provider: opts.GetProvider(),
|
||||
sessionStore: sessionStore,
|
||||
serveMux: upstreamProxy,
|
||||
redirectURL: redirectURL,
|
||||
whitelistDomains: opts.WhitelistDomains,
|
||||
skipAuthRegex: opts.SkipAuthRegex,
|
||||
skipAuthPreflight: opts.SkipAuthPreflight,
|
||||
skipAuthStripHeaders: opts.SkipAuthStripHeaders,
|
||||
mainJwtBearerVerifier: opts.GetOIDCVerifier(),
|
||||
extraJwtBearerVerifiers: opts.GetJWTBearerVerifiers(),
|
||||
compiledRegex: opts.GetCompiledRegex(),
|
||||
realClientIPParser: opts.GetRealClientIPParser(),
|
||||
SetXAuthRequest: opts.SetXAuthRequest,
|
||||
SetBasicAuth: opts.SetBasicAuth,
|
||||
PassUserHeaders: opts.PassUserHeaders,
|
||||
PassAccessToken: opts.PassAccessToken,
|
||||
SetAuthorization: opts.SetAuthorization,
|
||||
PassAuthorization: opts.PassAuthorization,
|
||||
PreferEmailToUser: opts.PreferEmailToUser,
|
||||
templates: templates,
|
||||
|
||||
sessionChain: sessionChain,
|
||||
|
||||
logger: logger,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func buildSessionChain(opts *options.Options, sessionStore sessionsapi.SessionStore) alice.Chain {
|
||||
chain := alice.New(middleware.NewScope())
|
||||
|
||||
chain = chain.Append(middleware.NewStoredSessionLoader(&middleware.StoredSessionLoaderOptions{
|
||||
SessionStore: sessionStore,
|
||||
RefreshPeriod: opts.Cookie.Refresh,
|
||||
RefreshSessionIfNeeded: opts.GetProvider().RefreshSessionIfNeeded,
|
||||
ValidateSessionState: opts.GetProvider().ValidateSessionState,
|
||||
}))
|
||||
|
||||
return chain
|
||||
}
|
||||
|
||||
// RobotsTxt disallows scraping pages from the OAuthProxy
|
||||
func (p *OAuthProxy) RobotsTxt(rw http.ResponseWriter) {
|
||||
_, err := fmt.Fprintf(rw, "User-agent: *\nDisallow: /")
|
||||
if err != nil {
|
||||
p.logger.Printf("Error writing robots.txt: %v", err)
|
||||
p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
|
||||
return
|
||||
}
|
||||
rw.WriteHeader(http.StatusOK)
|
||||
}
|
||||
|
||||
// ErrorPage writes an error response
|
||||
func (p *OAuthProxy) ErrorPage(rw http.ResponseWriter, code int, title string, message string) {
|
||||
rw.WriteHeader(code)
|
||||
t := struct {
|
||||
Title string
|
||||
Message string
|
||||
ProxyPrefix string
|
||||
}{
|
||||
Title: fmt.Sprintf("%d %s", code, title),
|
||||
Message: message,
|
||||
ProxyPrefix: p.ProxyPrefix,
|
||||
}
|
||||
err := p.templates.ExecuteTemplate(rw, "error.html", t)
|
||||
if err != nil {
|
||||
p.logger.Printf("Error rendering error.html template: %v", err)
|
||||
http.Error(rw, "Internal Server Error", http.StatusInternalServerError)
|
||||
}
|
||||
}
|
||||
|
||||
// splitHostPort separates host and port. If the port is not valid, it returns
|
||||
// the entire input as host, and it doesn't check the validity of the host.
|
||||
// Unlike net.SplitHostPort, but per RFC 3986, it requires ports to be numeric.
|
||||
// *** taken from net/url, modified validOptionalPort() to accept ":*"
|
||||
func splitHostPort(hostport string) (host, port string) {
|
||||
host = hostport
|
||||
|
||||
colon := strings.LastIndexByte(host, ':')
|
||||
if colon != -1 && validOptionalPort(host[colon:]) {
|
||||
host, port = host[:colon], host[colon+1:]
|
||||
}
|
||||
|
||||
if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
|
||||
host = host[1 : len(host)-1]
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
// validOptionalPort reports whether port is either an empty string
|
||||
// or matches /^:\d*$/
|
||||
// *** taken from net/url, modified to accept ":*"
|
||||
func validOptionalPort(port string) bool {
|
||||
if port == "" || port == ":*" {
|
||||
return true
|
||||
}
|
||||
if port[0] != ':' {
|
||||
return false
|
||||
}
|
||||
for _, b := range port[1:] {
|
||||
if b < '0' || b > '9' {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=en
|
||||
var noCacheHeaders = map[string]string{
|
||||
"Expires": time.Unix(0, 0).Format(time.RFC1123),
|
||||
"Cache-Control": "no-cache, no-store, must-revalidate, max-age=0",
|
||||
"X-Accel-Expires": "0", // https://www.nginx.com/resources/wiki/start/topics/examples/x-accel/
|
||||
}
|
||||
|
||||
// prepareNoCache prepares headers for preventing browser caching.
|
||||
func prepareNoCache(w http.ResponseWriter) {
|
||||
// Set NoCache headers
|
||||
for k, v := range noCacheHeaders {
|
||||
w.Header().Set(k, v)
|
||||
}
|
||||
}
|
||||
|
||||
func (p *OAuthProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
|
||||
if req.URL.Path != p.AuthOnlyPath && strings.HasPrefix(req.URL.Path, p.ProxyPrefix) {
|
||||
prepareNoCache(rw)
|
||||
}
|
||||
|
||||
switch path := req.URL.Path; {
|
||||
case path == p.RobotsPath:
|
||||
p.RobotsTxt(rw)
|
||||
case p.IsWhitelistedRequest(req):
|
||||
p.SkipAuthProxy(rw, req)
|
||||
case path == p.SignInPath:
|
||||
p.OAuthStart(rw, req)
|
||||
case path == p.SignOutPath:
|
||||
p.SignOut(rw, req)
|
||||
case path == p.OAuthStartPath:
|
||||
p.OAuthStart(rw, req)
|
||||
case path == p.OAuthCallbackPath:
|
||||
p.OAuthCallback(rw, req)
|
||||
case path == p.AuthOnlyPath:
|
||||
p.AuthenticateOnly(rw, req)
|
||||
case path == p.UserInfoPath:
|
||||
p.UserInfo(rw, req)
|
||||
default:
|
||||
p.Proxy(rw, req)
|
||||
}
|
||||
}
|
||||
|
||||
//UserInfo endpoint outputs session email and preferred username in JSON format
|
||||
func (p *OAuthProxy) UserInfo(rw http.ResponseWriter, req *http.Request) {
|
||||
|
||||
session, err := p.getAuthenticatedSession(rw, req)
|
||||
if err != nil {
|
||||
http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
|
||||
return
|
||||
}
|
||||
userInfo := struct {
|
||||
Email string `json:"email"`
|
||||
PreferredUsername string `json:"preferredUsername,omitempty"`
|
||||
}{
|
||||
Email: session.Email,
|
||||
PreferredUsername: session.PreferredUsername,
|
||||
}
|
||||
rw.Header().Set("Content-Type", "application/json")
|
||||
rw.WriteHeader(http.StatusOK)
|
||||
err = json.NewEncoder(rw).Encode(userInfo)
|
||||
if err != nil {
|
||||
p.logger.Printf("Error encoding user info: %v", err)
|
||||
p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
|
||||
}
|
||||
}
|
||||
|
||||
// SignOut sends a response to clear the authentication cookie
|
||||
func (p *OAuthProxy) SignOut(rw http.ResponseWriter, req *http.Request) {
|
||||
redirect, err := p.GetRedirect(req)
|
||||
if err != nil {
|
||||
p.logger.Errorf("Error obtaining redirect: %v", err)
|
||||
p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
|
||||
return
|
||||
}
|
||||
err = p.ClearSessionCookie(rw, req)
|
||||
if err != nil {
|
||||
p.logger.Errorf("Error clearing session cookie: %v", err)
|
||||
p.ErrorPage(rw, http.StatusInternalServerError, "Internal Server Error", err.Error())
|
||||
return
|
||||
}
|
||||
http.Redirect(rw, req, redirect, http.StatusFound)
|
||||
}
|
||||
|
||||
// AuthenticateOnly checks whether the user is currently logged in
|
||||
func (p *OAuthProxy) AuthenticateOnly(rw http.ResponseWriter, req *http.Request) {
|
||||
session, err := p.getAuthenticatedSession(rw, req)
|
||||
if err != nil {
|
||||
http.Error(rw, "unauthorized request", http.StatusUnauthorized)
|
||||
return
|
||||
}
|
||||
|
||||
// we are authenticated
|
||||
p.addHeadersForProxying(rw, req, session)
|
||||
rw.WriteHeader(http.StatusAccepted)
|
||||
}
|
||||
|
||||
// SkipAuthProxy proxies whitelisted requests and skips authentication
|
||||
func (p *OAuthProxy) SkipAuthProxy(rw http.ResponseWriter, req *http.Request) {
|
||||
if p.skipAuthStripHeaders {
|
||||
p.stripAuthHeaders(req)
|
||||
}
|
||||
p.serveMux.ServeHTTP(rw, req)
|
||||
}
|
||||
|
||||
// Proxy proxies the user request if the user is authenticated else it prompts
|
||||
// them to authenticate
|
||||
func (p *OAuthProxy) Proxy(rw http.ResponseWriter, req *http.Request) {
|
||||
session, err := p.getAuthenticatedSession(rw, req)
|
||||
switch err {
|
||||
case nil:
|
||||
// we are authenticated
|
||||
p.addHeadersForProxying(rw, req, session)
|
||||
p.serveMux.ServeHTTP(rw, req)
|
||||
|
||||
case ErrNeedsLogin:
|
||||
// we need to send the user to a login screen
|
||||
if isAjax(req) {
|
||||
// no point redirecting an AJAX request
|
||||
p.ErrorJSON(rw, http.StatusUnauthorized)
|
||||
return
|
||||
}
|
||||
|
||||
p.OAuthStart(rw, req)
|
||||
|
||||
default:
|
||||
// unknown error
|
||||
p.logger.Errorf("Unexpected internal error: %v", err)
|
||||
p.ErrorPage(rw, http.StatusInternalServerError,
|
||||
"Internal Error", "Internal Error")
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
// getAuthenticatedSession checks whether a user is authenticated and returns a session object and nil error if so
|
||||
// Returns nil, ErrNeedsLogin if user needs to login.
|
||||
// Set-Cookie headers may be set on the response as a side-effect of calling this method.
|
||||
func (p *OAuthProxy) getAuthenticatedSession(rw http.ResponseWriter, req *http.Request) (*sessionsapi.SessionState, error) {
|
||||
var session *sessionsapi.SessionState
|
||||
|
||||
getSession := p.sessionChain.Then(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
||||
session = middleware.GetRequestScope(req).Session
|
||||
}))
|
||||
getSession.ServeHTTP(rw, req)
|
||||
|
||||
if session == nil {
|
||||
return nil, ErrNeedsLogin
|
||||
}
|
||||
|
||||
return session, nil
|
||||
}
|
||||
|
||||
// addHeadersForProxying adds the appropriate headers the request / response for proxying
|
||||
func (p *OAuthProxy) addHeadersForProxying(rw http.ResponseWriter, req *http.Request, session *sessionsapi.SessionState) {
|
||||
req.Header["X-Forwarded-User"] = []string{session.User}
|
||||
if session.Email != "" {
|
||||
req.Header["X-Forwarded-Email"] = []string{session.Email}
|
||||
}
|
||||
|
||||
if session.PreferredUsername != "" {
|
||||
req.Header["X-Forwarded-Preferred-Username"] = []string{session.PreferredUsername}
|
||||
req.Header["X-Auth-Username"] = []string{session.PreferredUsername}
|
||||
} else {
|
||||
req.Header.Del("X-Forwarded-Preferred-Username")
|
||||
req.Header.Del("X-Auth-Username")
|
||||
}
|
||||
|
||||
claims := Claims{}
|
||||
err := claims.FromIDToken(session.IDToken)
|
||||
if err != nil {
|
||||
log.WithError(err).Warning("Failed to parse IDToken")
|
||||
}
|
||||
userAttributes := claims.Proxy.UserAttributes
|
||||
// Attempt to set basic auth based on user's attributes
|
||||
if p.SetBasicAuth {
|
||||
var ok bool
|
||||
var password string
|
||||
if password, ok = userAttributes[p.BasicAuthPasswordAttribute].(string); !ok {
|
||||
password = ""
|
||||
}
|
||||
// Check if we should use email or a custom attribute as username
|
||||
var username string
|
||||
if username, ok = userAttributes[p.BasicAuthUserAttribute].(string); !ok {
|
||||
username = session.Email
|
||||
}
|
||||
authVal := b64.StdEncoding.EncodeToString([]byte(username + ":" + password))
|
||||
req.Header["Authorization"] = []string{fmt.Sprintf("Basic %s", authVal)}
|
||||
}
|
||||
// Check if user has additional headers set that we should sent
|
||||
if additionalHeaders, ok := userAttributes["additionalHeaders"].(map[string]string); ok {
|
||||
if additionalHeaders == nil {
|
||||
return
|
||||
}
|
||||
for key, value := range additionalHeaders {
|
||||
req.Header.Set(key, value)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// stripAuthHeaders removes Auth headers for whitelisted routes from skipAuthRegex
|
||||
func (p *OAuthProxy) stripAuthHeaders(req *http.Request) {
|
||||
if p.PassUserHeaders {
|
||||
req.Header.Del("X-Forwarded-User")
|
||||
req.Header.Del("X-Forwarded-Email")
|
||||
req.Header.Del("X-Forwarded-Preferred-Username")
|
||||
}
|
||||
|
||||
if p.PassAccessToken {
|
||||
req.Header.Del("X-Forwarded-Access-Token")
|
||||
}
|
||||
|
||||
if p.PassAuthorization {
|
||||
req.Header.Del("Authorization")
|
||||
}
|
||||
}
|
||||
|
||||
// isAjax checks if a request is an ajax request
|
||||
func isAjax(req *http.Request) bool {
|
||||
acceptValues := req.Header.Values("Accept")
|
||||
const ajaxReq = applicationJSON
|
||||
for _, v := range acceptValues {
|
||||
if v == ajaxReq {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// ErrorJSON returns the error code with an application/json mime type
|
||||
func (p *OAuthProxy) ErrorJSON(rw http.ResponseWriter, code int) {
|
||||
rw.Header().Set("Content-Type", applicationJSON)
|
||||
rw.WriteHeader(code)
|
||||
}
|
||||
28
outpost/pkg/proxy/templates.go
Normal file
28
outpost/pkg/proxy/templates.go
Normal file
@ -0,0 +1,28 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"html/template"
|
||||
|
||||
log "github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
func getTemplates() *template.Template {
|
||||
t, err := template.New("foo").Parse(`{{define "error.html"}}
|
||||
<!DOCTYPE html>
|
||||
<html lang="en" charset="utf-8">
|
||||
<head>
|
||||
<title>{{.Title}}</title>
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
|
||||
</head>
|
||||
<body>
|
||||
<h2>{{.Title}}</h2>
|
||||
<p>{{.Message}}</p>
|
||||
<hr>
|
||||
<p><a href="{{.ProxyPrefix}}/sign_in">Sign In</a></p>
|
||||
</body>
|
||||
</html>{{end}}`)
|
||||
if err != nil {
|
||||
log.Fatalf("failed parsing template %s", err)
|
||||
}
|
||||
return t
|
||||
}
|
||||
Reference in New Issue
Block a user