Merge branch 'master' into refactor

2019-07-15 11:30:43 +01:00 · 2019-07-15 11:30:43 +01:00 · 630db3769b
commit 630db3769b
parent 6366690927 4bc0a91e2e
18 changed files with 689 additions and 184 deletions
--- a/.golangci.yml
+++ b/.golangci.yml
@ -0,0 +1,13 @@
+run:
+  deadline: 120s
+linters:
+  enable:
+    - govet
+    - golint
+    - ineffassign
+    - goconst
+    - deadcode
+    - gofmt
+    - goimports
+  enable-all: false
+  disable-all: true
--- a/.travis.yml
+++ b/.travis.yml
@ -6,8 +6,7 @@ install:
  - wget -O dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64
  - chmod +x dep
  - mv dep $GOPATH/bin/dep
-  - go get github.com/alecthomas/gometalinter
-  - gometalinter --install
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $GOPATH/bin v1.17.1
 script:
  - ./configure && make test
 sudo: false
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -15,6 +15,11 @@
 ## Changes since v3.2.0

 - [#187](https://github.com/pusher/oauth2_proxy/pull/187) Move root packages to pkg folder (@JoelSpeed)
+- [#65](https://github.com/pusher/oauth2_proxy/pull/65) Improvements to authenticate requests with a JWT bearer token in the `Authorization` header via
+  the `-skip-jwt-bearer-token` options. 
+  - Additional verifiers can be configured via the `-extra-jwt-issuers` flag if the JWT issuers is either an OpenID provider or has a JWKS URL 
+  (e.g. `https://example.com/.well-known/jwks.json`).
+- [#180](https://github.com/pusher/outh2_proxy/pull/180) Minor refactor of core proxying path (@aeijdenberg).
 - [#175](https://github.com/pusher/outh2_proxy/pull/175) Bump go-oidc to v2.0.0 (@aeijdenberg).
  - Includes fix for potential signature checking issue when OIDC discovery is skipped.
 - [#155](https://github.com/pusher/outh2_proxy/pull/155) Add RedisSessionStore implementation (@brianv0, @JoelSpeed)
@ -55,6 +60,13 @@

 - [#111](https://github.com/pusher/oauth2_proxy/pull/111) Add option for telling where to find a login.gov JWT key file (@timothy-spencer)
 - [#170](https://github.com/pusher/oauth2_proxy/pull/170) Restore binary tarball contents to be compatible with bitlys original tarballs (@zeha)
+- [#185](https://github.com/pusher/oauth2_proxy/pull/185) Fix an unsupported protocol scheme error during token validation when using the Azure provider (@jonas)
+- [#141](https://github.com/pusher/oauth2_proxy/pull/141) Check google group membership based on email address (@bchess)
+  - Google Group membership is additionally checked via email address, allowing users outside a GSuite domain to be authorized.
+- [#195](https://github.com/pusher/outh2_proxy/pull/195) Add `-banner` flag for overriding the banner line that is displayed (@steakunderscore)
+- [#198](https://github.com/pusher/outh2_proxy/pull/198) Switch from gometalinter to golangci-lint (@steakunderscore)
+- [#159](https://github.com/pusher/oauth2_proxy/pull/159) Add option to skip the OIDC provider verified email check: `--insecure-oidc-allow-unverified-email`
+- [#210](https://github.com/pusher/oauth2_proxy/pull/210) Update base image from Alpine 3.9 to 3.10 (@steakunderscore)

 # v3.2.0

--- a/3
+++ b/3
@ -3,6 +3,7 @@ FROM golang:1.12-stretch AS builder
 # Download tools
 RUN wget -O $GOPATH/bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64
 RUN chmod +x $GOPATH/bin/dep
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.1

 # Copy sources
 WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
@ -20,7 +21,7 @@ RUN dep ensure --vendor-only
 RUN ./configure && make build && touch jwt_signing_key.pem

 # Copy binary to alpine
-FROM alpine:3.9
+FROM alpine:3.10
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/oauth2_proxy /bin/oauth2_proxy
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/jwt_signing_key.pem /etc/ssl/private/jwt_signing_key.pem
--- a/Dockerfile.arm64
+++ b/Dockerfile.arm64
@ -3,6 +3,7 @@ FROM golang:1.12-stretch AS builder
 # Download tools
 RUN wget -O $GOPATH/bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64
 RUN chmod +x $GOPATH/bin/dep
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.1

 # Copy sources
 WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
@ -20,7 +21,7 @@ RUN dep ensure --vendor-only
 RUN ./configure && GOARCH=arm64 make build && touch jwt_signing_key.pem

 # Copy binary to alpine
-FROM arm64v8/alpine:3.9
+FROM arm64v8/alpine:3.10
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/oauth2_proxy /bin/oauth2_proxy
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/jwt_signing_key.pem /etc/ssl/private/jwt_signing_key.pem
--- a/Dockerfile.armv6
+++ b/Dockerfile.armv6
@ -3,6 +3,7 @@ FROM golang:1.12-stretch AS builder
 # Download tools
 RUN wget -O $GOPATH/bin/dep https://github.com/golang/dep/releases/download/v0.5.0/dep-linux-amd64
 RUN chmod +x $GOPATH/bin/dep
+RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.1

 # Copy sources
 WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
@ -20,7 +21,7 @@ RUN dep ensure --vendor-only
 RUN ./configure && GOARCH=arm GOARM=6 make build && touch jwt_signing_key.pem

 # Copy binary to alpine
-FROM arm32v6/alpine:3.9
+FROM arm32v6/alpine:3.10
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/oauth2_proxy /bin/oauth2_proxy
 COPY --from=builder /go/src/github.com/pusher/oauth2_proxy/jwt_signing_key.pem /etc/ssl/private/jwt_signing_key.pem
--- a/12
+++ b/12
@ -17,17 +17,7 @@ distclean: clean

 .PHONY: lint
 lint:
-	$(GOMETALINTER) --vendor --disable-all \
-		--enable=vet \
-		--enable=vetshadow \
-		--enable=golint \
-		--enable=ineffassign \
-		--enable=goconst \
-		--enable=deadcode \
-		--enable=gofmt \
-		--enable=goimports \
-		--deadline=120s \
-		--tests ./...
+	$(GOLANGCILINT) run

 .PHONY: dep
 dep:
--- a/4
+++ b/4
@ -126,7 +126,7 @@ check_for go
 check_go_version
 check_go_env
 check_for dep
-check_for gometalinter
+check_for golangci-lint

 echo

@ -135,7 +135,7 @@ cat <<- EOF > .env
  GO := "${tools[go]}"
  GO_VERSION := ${tools[go_version]}
  DEP := "${tools[dep]}"
-  GOMETALINTER := "${tools[gometalinter]}"
+  GOLANGCILINT := "${tools[golangci-lint]}"
 EOF

 echo "Environment configuration written to .env"
--- a/docs/configuration/configuration.md
+++ b/docs/configuration/configuration.md
@ -41,7 +41,9 @@ Usage of oauth2_proxy:
  -custom-templates-dir string: path to custom html templates
  -display-htpasswd-form: display username / password login form if an htpasswd file is provided (default true)
  -email-domain value: authenticate emails with the specified domain (may be given multiple times). Use * to authenticate any email
+  -extra-jwt-issuers: if -skip-jwt-bearer-tokens is set, a list of extra JWT issuer=audience pairs (where the issuer URL has a .well-known/openid-configuration or a .well-known/jwks.json)
  -flush-interval: period between flushing response buffers when streaming responses (default "1s")
+  -banner string: custom banner string. Use "-" to disable default banner.
  -footer string: custom footer string. Use "-" to disable default footer.
  -gcp-healthchecks: will enable /liveness_check, /readiness_check, and / (with the proper user-agent) endpoints that will make it work well with GCP App Engine and GKE Ingresses (default false)
  -github-org string: restrict logins to members of this organisation
@ -61,6 +63,7 @@ Usage of oauth2_proxy:
  -jwt-key string: private key in PEM format used to sign JWT, so that you can say something like -jwt-key="${OAUTH2_PROXY_JWT_KEY}": required by login.gov
  -jwt-key-file string: path to the private key file in PEM format used to sign the JWT so that you can say something like -jwt-key-file=/etc/ssl/private/jwt_signing_key.pem: required by login.gov
  -login-url string: Authentication endpoint
+  -insecure-oidc-allow-unverified-email: don't fail if an email address in an id_token is not verified
  -oidc-issuer-url: the OpenID Connect issuer URL. ie: "https://accounts.google.com"
  -oidc-jwks-url string: OIDC JWKS URI for token verification; required if OIDC discovery is disabled
  -pass-access-token: pass OAuth access_token to upstream via X-Forwarded-Access-Token header
@ -89,6 +92,7 @@ Usage of oauth2_proxy:
  -signature-key string: GAP-Signature request signature key (algorithm:secretkey)
  -skip-auth-preflight: will skip authentication for OPTIONS requests
  -skip-auth-regex value: bypass authentication for requests path's that match (may be given multiple times)
+  -skip-jwt-bearer-tokens: will skip requests that have verified JWT bearer tokens
  -skip-oidc-discovery: bypass OIDC endpoint discovery. login-url, redeem-url and oidc-jwks-url must be configured in this case
  -skip-provider-button: will skip sign-in-page to directly reach the next step: oauth/start
  -ssl-insecure-skip-verify: skip validation of certificates presented when using HTTPS
@ -310,3 +314,5 @@ nginx.ingress.kubernetes.io/configuration-snippet: |
    end
  }
 ```
+
+You have to substitute *name* with the actual cookie name you configured via --cookie-name parameter. If you don't set a custom cookie name the variable  should be "$upstream_cookie__oauth2_proxy_1" instead of "$upstream_cookie_name_1" and the new cookie-name should be "_oauth2_proxy_1=" instead of "name_1=".
--- a/http_test.go
+++ b/http_test.go
@ -8,6 +8,9 @@ import (
 	"github.com/stretchr/testify/assert"
 )

+const localhost = "127.0.0.1"
+const host = "test-server"
+
 func TestGCPHealthcheckLiveness(t *testing.T) {
 	handler := func(w http.ResponseWriter, req *http.Request) {
 		w.Write([]byte("test"))
@ -16,8 +19,8 @@ func TestGCPHealthcheckLiveness(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("GET", "/liveness_check", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	h.ServeHTTP(rw, r)

 	assert.Equal(t, 200, rw.Code)
@ -32,8 +35,8 @@ func TestGCPHealthcheckReadiness(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("GET", "/readiness_check", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	h.ServeHTTP(rw, r)

 	assert.Equal(t, 200, rw.Code)
@ -48,8 +51,8 @@ func TestGCPHealthcheckNotHealthcheck(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("GET", "/not_any_check", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	h.ServeHTTP(rw, r)

 	assert.Equal(t, "test", rw.Body.String())
@ -63,8 +66,8 @@ func TestGCPHealthcheckIngress(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("GET", "/", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	r.Header.Set(userAgentHeader, googleHealthCheckUserAgent)
 	h.ServeHTTP(rw, r)

@ -80,8 +83,8 @@ func TestGCPHealthcheckNotIngress(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("GET", "/foo", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	r.Header.Set(userAgentHeader, googleHealthCheckUserAgent)
 	h.ServeHTTP(rw, r)

@ -96,8 +99,8 @@ func TestGCPHealthcheckNotIngressPut(t *testing.T) {
 	h := gcpHealthcheck(http.HandlerFunc(handler))
 	rw := httptest.NewRecorder()
 	r, _ := http.NewRequest("PUT", "/", nil)
-	r.RemoteAddr = "127.0.0.1"
-	r.Host = "test-server"
+	r.RemoteAddr = localhost
+	r.Host = host
 	r.Header.Set(userAgentHeader, googleHealthCheckUserAgent)
 	h.ServeHTTP(rw, r)

--- a/main.go
+++ b/main.go
@ -23,6 +23,7 @@ func main() {
 	whitelistDomains := StringArray{}
 	upstreams := StringArray{}
 	skipAuthRegex := StringArray{}
+	jwtIssuers := StringArray{}
 	googleGroups := StringArray{}
 	redisSentinelConnectionURLs := StringArray{}

@ -48,6 +49,8 @@ func main() {
 	flagSet.Bool("skip-auth-preflight", false, "will skip authentication for OPTIONS requests")
 	flagSet.Bool("ssl-insecure-skip-verify", false, "skip validation of certificates presented when using HTTPS")
 	flagSet.Duration("flush-interval", time.Duration(1)*time.Second, "period between response flushing when streaming responses")
+	flagSet.Bool("skip-jwt-bearer-tokens", false, "will skip requests that have verified JWT bearer tokens (default false)")
+	flagSet.Var(&jwtIssuers, "extra-jwt-issuers", "if skip-jwt-bearer-tokens is set, a list of extra JWT issuer=audience pairs (where the issuer URL has a .well-known/openid-configuration or a .well-known/jwks.json)")

 	flagSet.Var(&emailDomains, "email-domain", "authenticate emails with the specified domain (may be given multiple times). Use * to authenticate any email")
 	flagSet.Var(&whitelistDomains, "whitelist-domain", "allowed domains for redirection after authentication. Prefix domain with a . to allow subdomains (eg .example.com)")
@ -63,6 +66,7 @@ func main() {
 	flagSet.String("htpasswd-file", "", "additionally authenticate against a htpasswd file. Entries must be created with \"htpasswd -s\" for SHA encryption or \"htpasswd -B\" for bcrypt encryption")
 	flagSet.Bool("display-htpasswd-form", true, "display username / password login form if an htpasswd file is provided")
 	flagSet.String("custom-templates-dir", "", "path to custom html templates")
+	flagSet.String("banner", "", "custom banner string. Use \"-\" to disable default banner.")
 	flagSet.String("footer", "", "custom footer string. Use \"-\" to disable default footer.")
 	flagSet.String("proxy-prefix", "/oauth2", "the url root path that this proxy should be nested under (e.g. /<oauth2>/sign_in)")
 	flagSet.Bool("proxy-websockets", true, "enables WebSocket proxying")
@ -100,6 +104,7 @@ func main() {

 	flagSet.String("provider", "google", "OAuth provider")
 	flagSet.String("oidc-issuer-url", "", "OpenID Connect issuer URL (ie: https://accounts.google.com)")
+	flagSet.Bool("insecure-oidc-allow-unverified-email", false, "Don't fail if an email address in an id_token is not verified")
 	flagSet.Bool("skip-oidc-discovery", false, "Skip OIDC discovery and use manually supplied Endpoints")
 	flagSet.String("oidc-jwks-url", "", "OpenID Connect JWKS URL (ie: https://www.googleapis.com/oauth2/v3/certs)")
 	flagSet.String("login-url", "", "Authentication endpoint")
@ -145,7 +150,13 @@ func main() {
 	validator := NewValidator(opts.EmailDomains, opts.AuthenticatedEmailsFile)
 	oauthproxy := NewOAuthProxy(opts, validator)

-	if len(opts.EmailDomains) != 0 && opts.AuthenticatedEmailsFile == "" {
+	if len(opts.Banner) >= 1 {
+		if opts.Banner == "-" {
+			oauthproxy.SignInMessage = ""
+		} else {
+			oauthproxy.SignInMessage = opts.Banner
+		}
+	} else if len(opts.EmailDomains) != 0 && opts.AuthenticatedEmailsFile == "" {
 		if len(opts.EmailDomains) > 1 {
 			oauthproxy.SignInMessage = fmt.Sprintf("Authenticate using one of the following domains: %v", strings.Join(opts.EmailDomains, ", "))
 		} else if opts.EmailDomains[0] != "*" {
--- a/oauthproxy.go
+++ b/oauthproxy.go
@ -1,6 +1,7 @@
 package main

 import (
+	"context"
 	b64 "encoding/base64"
 	"errors"
 	"fmt"
@ -13,6 +14,7 @@ import (
 	"strings"
 	"time"

+	"github.com/coreos/go-oidc"
 	"github.com/mbland/hmacauth"
 	sessionsapi "github.com/pusher/oauth2_proxy/pkg/apis/sessions"
 	"github.com/pusher/oauth2_proxy/pkg/encryption"
@ -47,6 +49,11 @@ var SignatureHeaders = []string{
 	"Gap-Auth",
 }

+var (
+	// ErrNeedsLogin means the user should be redirected to the login page
+	ErrNeedsLogin = errors.New("redirect to login page")
+)
+
 // OAuthProxy is the main authentication proxy
 type OAuthProxy struct {
 	CookieSeed     string
@ -87,8 +94,11 @@ type OAuthProxy struct {
 	PassAuthorization   bool
 	skipAuthRegex       []string
 	skipAuthPreflight   bool
+	skipJwtBearerTokens bool
+	jwtBearerVerifiers  []*oidc.IDTokenVerifier
 	compiledRegex       []*regexp.Regexp
 	templates           *template.Template
+	Banner              string
 	Footer              string
 }

@ -151,7 +161,7 @@ func NewFileServer(path string, filesystemPath string) (proxy http.Handler) {
 }

 // NewWebSocketOrRestReverseProxy creates a reverse proxy for REST or websocket based on url
-func NewWebSocketOrRestReverseProxy(u *url.URL, opts *Options, auth hmacauth.HmacAuth) (restProxy http.Handler) {
+func NewWebSocketOrRestReverseProxy(u *url.URL, opts *Options, auth hmacauth.HmacAuth) http.Handler {
 	u.Path = ""
 	proxy := NewReverseProxy(u, opts.FlushInterval)
 	if !opts.PassHostHeader {
@ -167,7 +177,12 @@ func NewWebSocketOrRestReverseProxy(u *url.URL, opts *Options, auth hmacauth.Hma
 		wsURL := &url.URL{Scheme: wsScheme, Host: u.Host}
 		wsProxy = wsutil.NewSingleHostReverseProxy(wsURL)
 	}
-	return &UpstreamProxy{u.Host, proxy, wsProxy, auth}
+	return &UpstreamProxy{
+		upstream:  u.Host,
+		handler:   proxy,
+		wsHandler: wsProxy,
+		auth:      auth,
+	}
 }

 // NewOAuthProxy creates a new instance of OOuthProxy from the options provided
@ -192,7 +207,13 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
 			}
 			logger.Printf("mapping path %q => file system %q", path, u.Path)
 			proxy := NewFileServer(path, u.Path)
-			serveMux.Handle(path, &UpstreamProxy{path, proxy, nil, nil})
+			uProxy := UpstreamProxy{
+				upstream:  path,
+				handler:   proxy,
+				wsHandler: nil,
+				auth:      nil,
+			}
+			serveMux.Handle(path, &uProxy)
 		default:
 			panic(fmt.Sprintf("unknown upstream protocol %s", u.Scheme))
 		}
@ -201,6 +222,12 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
 		logger.Printf("compiled skip-auth-regex => %q", u)
 	}

+	if opts.SkipJwtBearerTokens {
+		logger.Printf("Skipping JWT tokens from configured OIDC issuer: %q", opts.OIDCIssuerURL)
+		for _, issuer := range opts.ExtraJwtIssuers {
+			logger.Printf("Skipping JWT tokens from extra JWT issuer: %q", issuer)
+		}
+	}
 	redirectURL := opts.redirectURL
 	if redirectURL.Path == "" {
 		redirectURL.Path = fmt.Sprintf("%s/callback", opts.ProxyPrefix)
@ -242,6 +269,8 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
 		whitelistDomains:    opts.WhitelistDomains,
 		skipAuthRegex:       opts.SkipAuthRegex,
 		skipAuthPreflight:   opts.SkipAuthPreflight,
+		skipJwtBearerTokens: opts.SkipJwtBearerTokens,
+		jwtBearerVerifiers:  opts.jwtBearerVerifiers,
 		compiledRegex:       opts.CompiledRegex,
 		SetXAuthRequest:     opts.SetXAuthRequest,
 		PassBasicAuth:       opts.PassBasicAuth,
@ -252,6 +281,7 @@ func NewOAuthProxy(opts *Options, validator func(string) bool) *OAuthProxy {
 		PassAuthorization:   opts.PassAuthorization,
 		SkipProviderButton:  opts.SkipProviderButton,
 		templates:           loadTemplates(opts.CustomTemplatesDir),
+		Banner:              opts.Banner,
 		Footer:              opts.Footer,
 	}
 }
@ -477,20 +507,19 @@ func (p *OAuthProxy) IsValidRedirect(redirect string) bool {
 }

 // IsWhitelistedRequest is used to check if auth should be skipped for this request
-func (p *OAuthProxy) IsWhitelistedRequest(req *http.Request) (ok bool) {
+func (p *OAuthProxy) IsWhitelistedRequest(req *http.Request) bool {
 	isPreflightRequestAllowed := p.skipAuthPreflight && req.Method == "OPTIONS"
 	return isPreflightRequestAllowed || p.IsWhitelistedPath(req.URL.Path)
 }

 // IsWhitelistedPath is used to check if the request path is allowed without auth
-func (p *OAuthProxy) IsWhitelistedPath(path string) (ok bool) {
+func (p *OAuthProxy) IsWhitelistedPath(path string) bool {
 	for _, u := range p.compiledRegex {
-		ok = u.MatchString(path)
-		if ok {
-			return
+		if u.MatchString(path) {
+			return true
 		}
 	}
-	return
+	return false
 }

 func getRemoteAddr(req *http.Request) (s string) {
@ -634,57 +663,89 @@ func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
 		}
 		http.Redirect(rw, req, redirect, 302)
 	} else {
-		logger.PrintAuthf(session.Email, req, logger.AuthSuccess, "Invalid authentication via OAuth2: unauthorized")
+		logger.PrintAuthf(session.Email, req, logger.AuthFailure, "Invalid authentication via OAuth2: unauthorized")
 		p.ErrorPage(rw, 403, "Permission Denied", "Invalid Account")
 	}
 }

 // AuthenticateOnly checks whether the user is currently logged in
 func (p *OAuthProxy) AuthenticateOnly(rw http.ResponseWriter, req *http.Request) {
-	status := p.Authenticate(rw, req)
-	if status == http.StatusAccepted {
-		rw.WriteHeader(http.StatusAccepted)
-	} else {
+	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)
 }

 // 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) {
-	status := p.Authenticate(rw, req)
-	if status == http.StatusInternalServerError {
-		p.ErrorPage(rw, http.StatusInternalServerError,
-			"Internal Error", "Internal Error")
-	} else if status == http.StatusForbidden {
+	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
+		}
+
 		if p.SkipProviderButton {
 			p.OAuthStart(rw, req)
 		} else {
 			p.SignInPage(rw, req, http.StatusForbidden)
 		}
-	} else if status == http.StatusUnauthorized {
-		p.ErrorJSON(rw, status)
-	} else {
-		p.serveMux.ServeHTTP(rw, req)
-	}
+
+	default:
+		// unknown error
+		logger.Printf("Unexpected internal error: %s", err)
+		p.ErrorPage(rw, http.StatusInternalServerError,
+			"Internal Error", "Internal Error")
 	}

-// Authenticate checks whether a user is authenticated
-func (p *OAuthProxy) Authenticate(rw http.ResponseWriter, req *http.Request) int {
+}
+
+// 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
+	var err error
 	var saveSession, clearSession, revalidated bool
-	remoteAddr := getRemoteAddr(req)

-	session, err := p.LoadCookiedSession(req)
+	if p.skipJwtBearerTokens && req.Header.Get("Authorization") != "" {
+		session, err = p.GetJwtSession(req)
+		if err != nil {
+			logger.Printf("Error retrieving session from token in Authorization header: %s", err)
+		}
+		if session != nil {
+			saveSession = false
+		}
+	}
+
+	remoteAddr := getRemoteAddr(req)
+	if session == nil {
+		session, err = p.LoadCookiedSession(req)
 		if err != nil {
 			logger.Printf("Error loading cookied session: %s", err)
 		}
-	if session != nil && session.Age() > p.CookieRefresh && p.CookieRefresh != time.Duration(0) {
+
+		if session != nil {
+			if session.Age() > p.CookieRefresh && p.CookieRefresh != time.Duration(0) {
 				logger.Printf("Refreshing %s old session cookie for %s (refresh after %s)", session.Age(), session, p.CookieRefresh)
 				saveSession = true
 			}

-	var ok bool
-	if ok, err = p.provider.RefreshSessionIfNeeded(session); err != nil {
+			if ok, err := p.provider.RefreshSessionIfNeeded(session); err != nil {
 				logger.Printf("%s removing session. error refreshing access token %s %s", remoteAddr, err, session)
 				clearSession = true
 				session = nil
@ -692,6 +753,8 @@ func (p *OAuthProxy) Authenticate(rw http.ResponseWriter, req *http.Request) int
 				saveSession = true
 				revalidated = true
 			}
+		}
+	}

 	if session != nil && session.IsExpired() {
 		logger.Printf("Removing session: token expired %s", session)
@ -709,18 +772,20 @@ func (p *OAuthProxy) Authenticate(rw http.ResponseWriter, req *http.Request) int
 		}
 	}

-	if session != nil && session.Email != "" && !p.Validator(session.Email) {
+	if session != nil && session.Email != "" {
+		if !p.Validator(session.Email) || !p.provider.ValidateGroup(session.Email) {
 			logger.Printf(session.Email, req, logger.AuthFailure, "Invalid authentication via session: removing session %s", session)
 			session = nil
 			saveSession = false
 			clearSession = true
 		}
+	}

 	if saveSession && session != nil {
 		err = p.SaveSession(rw, req, session)
 		if err != nil {
 			logger.PrintAuthf(session.Email, req, logger.AuthError, "Save session error %s", err)
-			return http.StatusInternalServerError
+			return nil, err
 		}
 	}

@ -736,15 +801,14 @@ func (p *OAuthProxy) Authenticate(rw http.ResponseWriter, req *http.Request) int
 	}

 	if session == nil {
-		// Check if is an ajax request and return unauthorized to avoid a redirect
-		// to the login page
-		if p.isAjax(req) {
-			return http.StatusUnauthorized
-		}
-		return http.StatusForbidden
+		return nil, ErrNeedsLogin
 	}

-	// At this point, the user is authenticated. proxy normally
+	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) {
 	if p.PassBasicAuth {
 		req.SetBasicAuth(session.User, p.BasicAuthPassword)
 		req.Header["X-Forwarded-User"] = []string{session.User}
@ -781,7 +845,6 @@ func (p *OAuthProxy) Authenticate(rw http.ResponseWriter, req *http.Request) int
 	} else {
 		rw.Header().Set("GAP-Auth", session.Email)
 	}
-	return http.StatusAccepted
 }

 // CheckBasicAuth checks the requests Authorization header for basic auth
@ -815,7 +878,7 @@ func (p *OAuthProxy) CheckBasicAuth(req *http.Request) (*sessionsapi.SessionStat
 }

 // isAjax checks if a request is an ajax request
-func (p *OAuthProxy) isAjax(req *http.Request) bool {
+func isAjax(req *http.Request) bool {
 	acceptValues, ok := req.Header["accept"]
 	if !ok {
 		acceptValues = req.Header["Accept"]
@ -834,3 +897,92 @@ func (p *OAuthProxy) ErrorJSON(rw http.ResponseWriter, code int) {
 	rw.Header().Set("Content-Type", applicationJSON)
 	rw.WriteHeader(code)
 }
+
+// GetJwtSession loads a session based on a JWT token in the authorization header.
+func (p *OAuthProxy) GetJwtSession(req *http.Request) (*sessionsapi.SessionState, error) {
+	rawBearerToken, err := p.findBearerToken(req)
+	if err != nil {
+		return nil, err
+	}
+
+	ctx := context.Background()
+	var session *sessionsapi.SessionState
+	for _, verifier := range p.jwtBearerVerifiers {
+		bearerToken, err := verifier.Verify(ctx, rawBearerToken)
+
+		if err != nil {
+			logger.Printf("failed to verify bearer token: %v", err)
+			continue
+		}
+
+		var claims struct {
+			Subject  string `json:"sub"`
+			Email    string `json:"email"`
+			Verified *bool  `json:"email_verified"`
+		}
+
+		if err := bearerToken.Claims(&claims); err != nil {
+			return nil, fmt.Errorf("failed to parse bearer token claims: %v", err)
+		}
+
+		if claims.Email == "" {
+			claims.Email = claims.Subject
+		}
+
+		if claims.Verified != nil && !*claims.Verified {
+			return nil, fmt.Errorf("email in id_token (%s) isn't verified", claims.Email)
+		}
+
+		session = &sessionsapi.SessionState{
+			AccessToken:  rawBearerToken,
+			IDToken:      rawBearerToken,
+			RefreshToken: "",
+			ExpiresOn:    bearerToken.Expiry,
+			Email:        claims.Email,
+			User:         claims.Email,
+		}
+		return session, nil
+	}
+	return nil, fmt.Errorf("unable to verify jwt token %s", req.Header.Get("Authorization"))
+}
+
+// findBearerToken finds a valid JWT token from the Authorization header of a given request.
+func (p *OAuthProxy) findBearerToken(req *http.Request) (string, error) {
+	auth := req.Header.Get("Authorization")
+	s := strings.SplitN(auth, " ", 2)
+	if len(s) != 2 {
+		return "", fmt.Errorf("invalid authorization header %s", auth)
+	}
+	jwtRegex := regexp.MustCompile(`^eyJ[a-zA-Z0-9_-]*\.eyJ[a-zA-Z0-9_-]*\.[a-zA-Z0-9_-]+$`)
+	var rawBearerToken string
+	if s[0] == "Bearer" && jwtRegex.MatchString(s[1]) {
+		rawBearerToken = s[1]
+	} else if s[0] == "Basic" {
+		// Check if we have a Bearer token masquerading in Basic
+		b, err := b64.StdEncoding.DecodeString(s[1])
+		if err != nil {
+			return "", err
+		}
+		pair := strings.SplitN(string(b), ":", 2)
+		if len(pair) != 2 {
+			return "", fmt.Errorf("invalid format %s", b)
+		}
+		user, password := pair[0], pair[1]
+
+		// check user, user+password, or just password for a token
+		if jwtRegex.MatchString(user) {
+			// Support blank passwords or magic `x-oauth-basic` passwords - nothing else
+			if password == "" || password == "x-oauth-basic" {
+				rawBearerToken = user
+			}
+		} else if jwtRegex.MatchString(password) {
+			// support passwords and ignore user
+			rawBearerToken = password
+		}
+	}
+	if rawBearerToken == "" {
+		return "", fmt.Errorf("no valid bearer token found in authorization header")
+	}
+
+	return rawBearerToken, nil
+}
--- a/oauthproxy_test.go
+++ b/oauthproxy_test.go
@ -1,8 +1,10 @@
 package main

 import (
+	"context"
 	"crypto"
 	"encoding/base64"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
@ -14,6 +16,7 @@ import (
 	"testing"
 	"time"

+	"github.com/coreos/go-oidc"
 	"github.com/mbland/hmacauth"
 	"github.com/pusher/oauth2_proxy/pkg/apis/sessions"
 	"github.com/pusher/oauth2_proxy/pkg/logger"
@ -160,9 +163,9 @@ func TestEncodedSlashes(t *testing.T) {

 func TestRobotsTxt(t *testing.T) {
 	opts := NewOptions()
-	opts.ClientID = "bazquux"
-	opts.ClientSecret = "foobar"
-	opts.CookieSecret = "xyzzyplugh"
+	opts.ClientID = "asdlkjx"
+	opts.ClientSecret = "alkgks"
+	opts.CookieSecret = "asdkugkj"
 	opts.Validate()

 	proxy := NewOAuthProxy(opts, func(string) bool { return true })
@ -175,9 +178,9 @@ func TestRobotsTxt(t *testing.T) {

 func TestIsValidRedirect(t *testing.T) {
 	opts := NewOptions()
-	opts.ClientID = "bazquux"
-	opts.ClientSecret = "foobar"
-	opts.CookieSecret = "xyzzyplugh"
+	opts.ClientID = "skdlfj"
+	opts.ClientSecret = "fgkdsgj"
+	opts.CookieSecret = "ljgiogbj"
 	// Should match domains that are exactly foo.bar and any subdomain of bar.foo
 	opts.WhitelistDomains = []string{"foo.bar", ".bar.foo"}
 	opts.Validate()
@ -228,6 +231,7 @@ type TestProvider struct {
 	*providers.ProviderData
 	EmailAddress   string
 	ValidToken     bool
+	GroupValidator func(string) bool
 }

 func NewTestProvider(providerURL *url.URL, emailAddress string) *TestProvider {
@ -252,6 +256,9 @@ func NewTestProvider(providerURL *url.URL, emailAddress string) *TestProvider {
 			Scope: "profile.email",
 		},
 		EmailAddress: emailAddress,
+		GroupValidator: func(s string) bool {
+			return true
+		},
 	}
 }

@ -263,6 +270,13 @@ func (tp *TestProvider) ValidateSessionState(session *sessions.SessionState) boo
 	return tp.ValidToken
 }

+func (tp *TestProvider) ValidateGroup(email string) bool {
+	if tp.GroupValidator != nil {
+		return tp.GroupValidator(email)
+	}
+	return true
+}
+
 func TestBasicAuthPassword(t *testing.T) {
 	providerServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		logger.Printf("%#v", r)
@ -284,8 +298,8 @@ func TestBasicAuthPassword(t *testing.T) {
 	// The CookieSecret must be 32 bytes in order to create the AES
 	// cipher.
 	opts.CookieSecret = "xyzzyplughxyzzyplughxyzzyplughxp"
-	opts.ClientID = "bazquux"
-	opts.ClientSecret = "foobar"
+	opts.ClientID = "dlgkj"
+	opts.ClientSecret = "alkgret"
 	opts.CookieSecure = false
 	opts.PassBasicAuth = true
 	opts.PassUserHeaders = true
@ -378,8 +392,8 @@ func NewPassAccessTokenTest(opts PassAccessTokenTestOptions) *PassAccessTokenTes
 	// The CookieSecret must be 32 bytes in order to create the AES
 	// cipher.
 	t.opts.CookieSecret = "xyzzyplughxyzzyplughxyzzyplughxp"
-	t.opts.ClientID = "bazquux"
-	t.opts.ClientSecret = "foobar"
+	t.opts.ClientID = "slgkj"
+	t.opts.ClientSecret = "gfjgojl"
 	t.opts.CookieSecure = false
 	t.opts.PassAccessToken = opts.PassAccessToken
 	t.opts.Validate()
@ -504,9 +518,9 @@ func NewSignInPageTest(skipProvider bool) *SignInPageTest {
 	var sipTest SignInPageTest

 	sipTest.opts = NewOptions()
-	sipTest.opts.CookieSecret = "foobar"
-	sipTest.opts.ClientID = "bazquux"
-	sipTest.opts.ClientSecret = "xyzzyplugh"
+	sipTest.opts.CookieSecret = "adklsj2"
+	sipTest.opts.ClientID = "lkdgj"
+	sipTest.opts.ClientSecret = "sgiufgoi"
 	sipTest.opts.SkipProviderButton = skipProvider
 	sipTest.opts.Validate()

@ -610,8 +624,8 @@ func NewProcessCookieTest(opts ProcessCookieTestOpts, modifiers ...OptionsModifi
 	for _, modifier := range modifiers {
 		modifier(pcTest.opts)
 	}
-	pcTest.opts.ClientID = "bazquux"
-	pcTest.opts.ClientSecret = "xyzzyplugh"
+	pcTest.opts.ClientID = "asdfljk"
+	pcTest.opts.ClientSecret = "lkjfdsig"
 	pcTest.opts.CookieSecret = "0123456789abcdefabcd"
 	// First, set the CookieRefresh option so proxy.AesCipher is created,
 	// needed to encrypt the access_token.
@ -788,6 +802,25 @@ func TestAuthOnlyEndpointUnauthorizedOnEmailValidationFailure(t *testing.T) {
 	assert.Equal(t, "unauthorized request\n", string(bodyBytes))
 }

+func TestAuthOnlyEndpointUnauthorizedOnProviderGroupValidationFailure(t *testing.T) {
+	test := NewAuthOnlyEndpointTest()
+	startSession := &sessions.SessionState{
+		Email: "michael.bland@gsa.gov", AccessToken: "my_access_token", CreatedAt: time.Now()}
+	test.SaveSession(startSession)
+	provider := &TestProvider{
+		ValidToken: true,
+		GroupValidator: func(s string) bool {
+			return false
+		},
+	}
+
+	test.proxy.provider = provider
+	test.proxy.ServeHTTP(test.rw, test.req)
+	assert.Equal(t, http.StatusUnauthorized, test.rw.Code)
+	bodyBytes, _ := ioutil.ReadAll(test.rw.Body)
+	assert.Equal(t, "unauthorized request\n", string(bodyBytes))
+}
+
 func TestAuthOnlyEndpointSetXAuthRequestHeaders(t *testing.T) {
 	var pcTest ProcessCookieTest

@ -827,9 +860,9 @@ func TestAuthSkippedForPreflightRequests(t *testing.T) {

 	opts := NewOptions()
 	opts.Upstreams = append(opts.Upstreams, upstream.URL)
-	opts.ClientID = "bazquux"
-	opts.ClientSecret = "foobar"
-	opts.CookieSecret = "xyzzyplugh"
+	opts.ClientID = "aljsal"
+	opts.ClientSecret = "jglkfsdgj"
+	opts.CookieSecret = "dkfjgdls"
 	opts.SkipAuthPreflight = true
 	opts.Validate()

@ -966,8 +999,8 @@ func TestNoRequestSignature(t *testing.T) {
 func TestRequestSignatureGetRequest(t *testing.T) {
 	st := NewSignatureTest()
 	defer st.Close()
-	st.opts.SignatureKey = "sha1:foobar"
-	st.MakeRequestWithExpectedKey("GET", "", "foobar")
+	st.opts.SignatureKey = "sha1:7d9e1aa87a5954e6f9fc59266b3af9d7c35fda2d"
+	st.MakeRequestWithExpectedKey("GET", "", "7d9e1aa87a5954e6f9fc59266b3af9d7c35fda2d")
 	assert.Equal(t, 200, st.rw.Code)
 	assert.Equal(t, st.rw.Body.String(), "signatures match")
 }
@ -975,9 +1008,9 @@ func TestRequestSignatureGetRequest(t *testing.T) {
 func TestRequestSignaturePostRequest(t *testing.T) {
 	st := NewSignatureTest()
 	defer st.Close()
-	st.opts.SignatureKey = "sha1:foobar"
+	st.opts.SignatureKey = "sha1:d90df39e2d19282840252612dd7c81421a372f61"
 	payload := `{ "hello": "world!" }`
-	st.MakeRequestWithExpectedKey("POST", payload, "foobar")
+	st.MakeRequestWithExpectedKey("POST", payload, "d90df39e2d19282840252612dd7c81421a372f61")
 	assert.Equal(t, 200, st.rw.Code)
 	assert.Equal(t, st.rw.Body.String(), "signatures match")
 }
@ -1023,9 +1056,9 @@ type ajaxRequestTest struct {
 func newAjaxRequestTest() *ajaxRequestTest {
 	test := &ajaxRequestTest{}
 	test.opts = NewOptions()
-	test.opts.CookieSecret = "foobar"
-	test.opts.ClientID = "bazquux"
-	test.opts.ClientSecret = "xyzzyplugh"
+	test.opts.CookieSecret = "sdflsw"
+	test.opts.ClientID = "gkljfdl"
+	test.opts.ClientSecret = "sdflkjs"
 	test.opts.Validate()
 	test.proxy = NewOAuthProxy(test.opts, func(email string) bool {
 		return true
@ -1132,3 +1165,173 @@ func TestClearSingleCookie(t *testing.T) {

 	assert.Equal(t, 1, len(header["Set-Cookie"]), "should have 1 set-cookie header entries")
 }
+
+type NoOpKeySet struct {
+}
+
+func (NoOpKeySet) VerifySignature(ctx context.Context, jwt string) (payload []byte, err error) {
+	splitStrings := strings.Split(jwt, ".")
+	payloadString := splitStrings[1]
+	jsonString, err := base64.RawURLEncoding.DecodeString(payloadString)
+	return []byte(jsonString), err
+}
+
+func TestGetJwtSession(t *testing.T) {
+	/* token payload:
+	{
+	  "sub": "1234567890",
+	  "aud": "https://test.myapp.com",
+	  "name": "John Doe",
+	  "email": "john@example.com",
+	  "iss": "https://issuer.example.com",
+	  "iat": 1553691215,
+	  "exp": 1912151821
+	}
+	*/
+	goodJwt := "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9." +
+		"eyJzdWIiOiIxMjM0NTY3ODkwIiwiYXVkIjoiaHR0cHM6Ly90ZXN0Lm15YXBwLmNvbSIsIm5hbWUiOiJKb2huIERvZSIsImVtY" +
+		"WlsIjoiam9obkBleGFtcGxlLmNvbSIsImlzcyI6Imh0dHBzOi8vaXNzdWVyLmV4YW1wbGUuY29tIiwiaWF0IjoxNTUzNjkxMj" +
+		"E1LCJleHAiOjE5MTIxNTE4MjF9." +
+		"rLVyzOnEldUq_pNkfa-WiV8TVJYWyZCaM2Am_uo8FGg11zD7l-qmz3x1seTvqpH6Y0Ty00fmv6dJnGnC8WMnPXQiodRTfhBSe" +
+		"OKZMu0HkMD2sg52zlKkbfLTO6ic5VnbVgwjjrB8am_Ta6w7kyFUaB5C1BsIrrLMldkWEhynbb8"
+
+	keyset := NoOpKeySet{}
+	verifier := oidc.NewVerifier("https://issuer.example.com", keyset,
+		&oidc.Config{ClientID: "https://test.myapp.com", SkipExpiryCheck: true})
+
+	test := NewAuthOnlyEndpointTest(func(opts *Options) {
+		opts.PassAuthorization = true
+		opts.SetAuthorization = true
+		opts.SetXAuthRequest = true
+		opts.SkipJwtBearerTokens = true
+		opts.jwtBearerVerifiers = append(opts.jwtBearerVerifiers, verifier)
+	})
+	tp, _ := test.proxy.provider.(*TestProvider)
+	tp.GroupValidator = func(s string) bool {
+		return true
+	}
+
+	authHeader := fmt.Sprintf("Bearer %s", goodJwt)
+	test.req.Header = map[string][]string{
+		"Authorization": {authHeader},
+	}
+
+	// Bearer
+	session, _ := test.proxy.GetJwtSession(test.req)
+	assert.Equal(t, session.User, "john@example.com")
+	assert.Equal(t, session.Email, "john@example.com")
+	assert.Equal(t, session.ExpiresOn, time.Unix(1912151821, 0))
+	assert.Equal(t, session.IDToken, goodJwt)
+
+	test.proxy.ServeHTTP(test.rw, test.req)
+	if test.rw.Code >= 400 {
+		t.Fatalf("expected 3xx got %d", test.rw.Code)
+	}
+
+	// Check PassAuthorization, should overwrite Basic header
+	assert.Equal(t, test.req.Header.Get("Authorization"), authHeader)
+	assert.Equal(t, test.req.Header.Get("X-Forwarded-User"), "john@example.com")
+	assert.Equal(t, test.req.Header.Get("X-Forwarded-Email"), "john@example.com")
+
+	// SetAuthorization and SetXAuthRequest
+	assert.Equal(t, test.rw.Header().Get("Authorization"), authHeader)
+	assert.Equal(t, test.rw.Header().Get("X-Auth-Request-User"), "john@example.com")
+	assert.Equal(t, test.rw.Header().Get("X-Auth-Request-Email"), "john@example.com")
+}
+
+func TestJwtUnauthorizedOnGroupValidationFailure(t *testing.T) {
+	goodJwt := "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9." +
+		"eyJzdWIiOiIxMjM0NTY3ODkwIiwiYXVkIjoiaHR0cHM6Ly90ZXN0Lm15YXBwLmNvbSIsIm5hbWUiOiJKb2huIERvZSIsImVtY" +
+		"WlsIjoiam9obkBleGFtcGxlLmNvbSIsImlzcyI6Imh0dHBzOi8vaXNzdWVyLmV4YW1wbGUuY29tIiwiaWF0IjoxNTUzNjkxMj" +
+		"E1LCJleHAiOjE5MTIxNTE4MjF9." +
+		"rLVyzOnEldUq_pNkfa-WiV8TVJYWyZCaM2Am_uo8FGg11zD7l-qmz3x1seTvqpH6Y0Ty00fmv6dJnGnC8WMnPXQiodRTfhBSe" +
+		"OKZMu0HkMD2sg52zlKkbfLTO6ic5VnbVgwjjrB8am_Ta6w7kyFUaB5C1BsIrrLMldkWEhynbb8"
+
+	keyset := NoOpKeySet{}
+	verifier := oidc.NewVerifier("https://issuer.example.com", keyset,
+		&oidc.Config{ClientID: "https://test.myapp.com", SkipExpiryCheck: true})
+
+	test := NewAuthOnlyEndpointTest(func(opts *Options) {
+		opts.PassAuthorization = true
+		opts.SetAuthorization = true
+		opts.SetXAuthRequest = true
+		opts.SkipJwtBearerTokens = true
+		opts.jwtBearerVerifiers = append(opts.jwtBearerVerifiers, verifier)
+	})
+	tp, _ := test.proxy.provider.(*TestProvider)
+	// Verify ValidateGroup fails JWT authorization
+	tp.GroupValidator = func(s string) bool {
+		return false
+	}
+
+	authHeader := fmt.Sprintf("Bearer %s", goodJwt)
+	test.req.Header = map[string][]string{
+		"Authorization": {authHeader},
+	}
+	test.proxy.ServeHTTP(test.rw, test.req)
+	if test.rw.Code != http.StatusUnauthorized {
+		t.Fatalf("expected 401 got %d", test.rw.Code)
+	}
+}
+
+func TestFindJwtBearerToken(t *testing.T) {
+	p := OAuthProxy{CookieName: "oauth2", CookieDomain: "abc"}
+	getReq := &http.Request{URL: &url.URL{Scheme: "http", Host: "example.com"}}
+
+	validToken := "eyJfoobar.eyJfoobar.12345asdf"
+	var token string
+
+	// Bearer
+	getReq.Header = map[string][]string{
+		"Authorization": {fmt.Sprintf("Bearer %s", validToken)},
+	}
+
+	token, _ = p.findBearerToken(getReq)
+	assert.Equal(t, validToken, token)
+
+	// Basic - no password
+	getReq.SetBasicAuth(token, "")
+	token, _ = p.findBearerToken(getReq)
+	assert.Equal(t, validToken, token)
+
+	// Basic - sentinel password
+	getReq.SetBasicAuth(token, "x-oauth-basic")
+	token, _ = p.findBearerToken(getReq)
+	assert.Equal(t, validToken, token)
+
+	// Basic - any username, password matching jwt pattern
+	getReq.SetBasicAuth("any-username-you-could-wish-for", token)
+	token, _ = p.findBearerToken(getReq)
+	assert.Equal(t, validToken, token)
+
+	failures := []string{
+		// Too many parts
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Not enough parts
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid encrypted key
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.//////.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid IV
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.//////.dGVzdA.dGVzdA",
+		// Invalid ciphertext
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.//////.dGVzdA",
+		// Invalid tag
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA.//////",
+		// Invalid header
+		"W10.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid header
+		"######.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Missing alc/enc params
+		"e30.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+	}
+
+	for _, failure := range failures {
+		getReq.Header = map[string][]string{
+			"Authorization": {fmt.Sprintf("Bearer %s", failure)},
+		}
+		_, err := p.findBearerToken(getReq)
+		assert.Error(t, err)
+	}
+
+	fmt.Printf("%s", token)
+}
--- a/options.go
+++ b/options.go
@ -51,6 +51,7 @@ type Options struct {
 	HtpasswdFile             string   `flag:"htpasswd-file" cfg:"htpasswd_file" env:"OAUTH2_PROXY_HTPASSWD_FILE"`
 	DisplayHtpasswdForm      bool     `flag:"display-htpasswd-form" cfg:"display_htpasswd_form" env:"OAUTH2_PROXY_DISPLAY_HTPASSWD_FORM"`
 	CustomTemplatesDir       string   `flag:"custom-templates-dir" cfg:"custom_templates_dir" env:"OAUTH2_PROXY_CUSTOM_TEMPLATES_DIR"`
+	Banner                   string   `flag:"banner" cfg:"banner" env:"OAUTH2_PROXY_BANNER"`
 	Footer                   string   `flag:"footer" cfg:"footer" env:"OAUTH2_PROXY_FOOTER"`

 	// Embed CookieOptions
@ -61,6 +62,8 @@ type Options struct {

 	Upstreams             []string      `flag:"upstream" cfg:"upstreams" env:"OAUTH2_PROXY_UPSTREAMS"`
 	SkipAuthRegex         []string      `flag:"skip-auth-regex" cfg:"skip_auth_regex" env:"OAUTH2_PROXY_SKIP_AUTH_REGEX"`
+	SkipJwtBearerTokens   bool          `flag:"skip-jwt-bearer-tokens" cfg:"skip_jwt_bearer_tokens" env:"OAUTH2_PROXY_SKIP_JWT_BEARER_TOKENS"`
+	ExtraJwtIssuers       []string      `flag:"extra-jwt-issuers" cfg:"extra_jwt_issuers" env:"OAUTH2_PROXY_EXTRA_JWT_ISSUERS"`
 	PassBasicAuth         bool          `flag:"pass-basic-auth" cfg:"pass_basic_auth" env:"OAUTH2_PROXY_PASS_BASIC_AUTH"`
 	BasicAuthPassword     string        `flag:"basic-auth-password" cfg:"basic_auth_password" env:"OAUTH2_PROXY_BASIC_AUTH_PASSWORD"`
 	PassAccessToken       bool          `flag:"pass-access-token" cfg:"pass_access_token" env:"OAUTH2_PROXY_PASS_ACCESS_TOKEN"`
@ -78,6 +81,7 @@ type Options struct {
 	// potential overrides.
 	Provider                         string `flag:"provider" cfg:"provider" env:"OAUTH2_PROXY_PROVIDER"`
 	OIDCIssuerURL                    string `flag:"oidc-issuer-url" cfg:"oidc_issuer_url" env:"OAUTH2_PROXY_OIDC_ISSUER_URL"`
+	InsecureOIDCAllowUnverifiedEmail bool   `flag:"insecure-oidc-allow-unverified-email" cfg:"insecure_oidc_allow_unverified_email" env:"OAUTH2_PROXY_INSECURE_OIDC_ALLOW_UNVERIFIED_EMAIL"`
 	SkipOIDCDiscovery                bool   `flag:"skip-oidc-discovery" cfg:"skip_oidc_discovery" env:"OAUTH2_SKIP_OIDC_DISCOVERY"`
 	OIDCJwksURL                      string `flag:"oidc-jwks-url" cfg:"oidc_jwks_url" env:"OAUTH2_OIDC_JWKS_URL"`
 	LoginURL                         string `flag:"login-url" cfg:"login_url" env:"OAUTH2_PROXY_LOGIN_URL"`
@ -117,6 +121,7 @@ type Options struct {
 	sessionStore       sessionsapi.SessionStore
 	signatureData      *SignatureData
 	oidcVerifier       *oidc.IDTokenVerifier
+	jwtBearerVerifiers []*oidc.IDTokenVerifier
 }

 // SignatureData holds hmacauth signature hash and key
@ -152,6 +157,7 @@ func NewOptions() *Options {
 		SetAuthorization:                 false,
 		PassAuthorization:                false,
 		ApprovalPrompt:                   "force",
+		InsecureOIDCAllowUnverifiedEmail: false,
 		SkipOIDCDiscovery:                false,
 		LoggingFilename:                  "",
 		LoggingMaxSize:                   100,
@ -168,6 +174,12 @@ func NewOptions() *Options {
 	}
 }

+// jwtIssuer hold parsed JWT issuer info that's used to construct a verifier.
+type jwtIssuer struct {
+	issuerURI string
+	audience  string
+}
+
 func parseURL(toParse string, urltype string, msgs []string) (*url.URL, []string) {
 	parsed, err := url.Parse(toParse)
 	if err != nil {
@ -244,6 +256,25 @@ func (o *Options) Validate() error {
 		}
 	}

+	if o.SkipJwtBearerTokens {
+		// If we are using an oidc provider, go ahead and add that provider to the list
+		if o.oidcVerifier != nil {
+			o.jwtBearerVerifiers = append(o.jwtBearerVerifiers, o.oidcVerifier)
+		}
+		// Configure extra issuers
+		if len(o.ExtraJwtIssuers) > 0 {
+			var jwtIssuers []jwtIssuer
+			jwtIssuers, msgs = parseJwtIssuers(o.ExtraJwtIssuers, msgs)
+			for _, jwtIssuer := range jwtIssuers {
+				verifier, err := newVerifierFromJwtIssuer(jwtIssuer)
+				if err != nil {
+					msgs = append(msgs, fmt.Sprintf("error building verifiers: %s", err))
+				}
+				o.jwtBearerVerifiers = append(o.jwtBearerVerifiers, verifier)
+			}
+		}
+	}
+
 	o.redirectURL, msgs = parseURL(o.RedirectURL, "redirect", msgs)

 	for _, u := range o.Upstreams {
@ -368,6 +399,7 @@ func parseProviderInfo(o *Options, msgs []string) []string {
 			}
 		}
 	case *providers.OIDCProvider:
+		p.AllowUnverifiedEmail = o.InsecureOIDCAllowUnverifiedEmail
 		if o.oidcVerifier == nil {
 			msgs = append(msgs, "oidc provider requires an oidc issuer URL")
 		} else {
@ -426,10 +458,49 @@ func parseSignatureKey(o *Options, msgs []string) []string {
 		return append(msgs, "unsupported signature hash algorithm: "+
 			o.SignatureKey)
 	}
-	o.signatureData = &SignatureData{hash, secretKey}
+	o.signatureData = &SignatureData{hash: hash, key: secretKey}
 	return msgs
 }

+// parseJwtIssuers takes in an array of strings in the form of issuer=audience
+// and parses to an array of jwtIssuer structs.
+func parseJwtIssuers(issuers []string, msgs []string) ([]jwtIssuer, []string) {
+	var parsedIssuers []jwtIssuer
+	for _, jwtVerifier := range issuers {
+		components := strings.Split(jwtVerifier, "=")
+		if len(components) < 2 {
+			msgs = append(msgs, fmt.Sprintf("invalid jwt verifier uri=audience spec: %s", jwtVerifier))
+			continue
+		}
+		uri, audience := components[0], strings.Join(components[1:], "=")
+		parsedIssuers = append(parsedIssuers, jwtIssuer{issuerURI: uri, audience: audience})
+	}
+	return parsedIssuers, msgs
+}
+
+// newVerifierFromJwtIssuer takes in issuer information in jwtIssuer info and returns
+// a verifier for that issuer.
+func newVerifierFromJwtIssuer(jwtIssuer jwtIssuer) (*oidc.IDTokenVerifier, error) {
+	config := &oidc.Config{
+		ClientID: jwtIssuer.audience,
+	}
+	// Try as an OpenID Connect Provider first
+	var verifier *oidc.IDTokenVerifier
+	provider, err := oidc.NewProvider(context.Background(), jwtIssuer.issuerURI)
+	if err != nil {
+		// Try as JWKS URI
+		jwksURI := strings.TrimSuffix(jwtIssuer.issuerURI, "/") + "/.well-known/jwks.json"
+		_, err := http.NewRequest("GET", jwksURI, nil)
+		if err != nil {
+			return nil, err
+		}
+		verifier = oidc.NewVerifier(jwtIssuer.issuerURI, oidc.NewRemoteKeySet(context.Background(), jwksURI), config)
+	} else {
+		verifier = provider.Verifier(config)
+	}
+	return verifier, nil
+}
+
 func validateCookieName(o *Options, msgs []string) []string {
 	cookie := &http.Cookie{Name: o.CookieName}
 	if cookie.String() == "" {
--- a/providers/google.go
+++ b/providers/google.go
@ -191,11 +191,9 @@ func getAdminService(adminEmail string, credentialsReader io.Reader) *admin.Serv
 func userInGroup(service *admin.Service, groups []string, email string) bool {
 	user, err := fetchUser(service, email)
 	if err != nil {
-		logger.Printf("error fetching user: %v", err)
-		return false
+		logger.Printf("Warning: unable to fetch user: %v", err)
+		user = nil
 	}
-	id := user.Id
-	custID := user.CustomerId

 	for _, group := range groups {
 		members, err := fetchGroupMembers(service, group)
@ -209,13 +207,19 @@ func userInGroup(service *admin.Service, groups []string, email string) bool {
 		}

 		for _, member := range members {
+			if member.Email == email {
+				return true
+			}
+			if user == nil {
+				continue
+			}
 			switch member.Type {
 			case "CUSTOMER":
-				if member.Id == custID {
+				if member.Id == user.CustomerId {
 					return true
 				}
 			case "USER":
-				if member.Id == id {
+				if member.Id == user.Id {
 					return true
 				}
 			}
--- a/providers/google_test.go
+++ b/providers/google_test.go
@ -3,12 +3,15 @@ package providers
 import (
 	"encoding/base64"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"testing"

 	"github.com/stretchr/testify/assert"
+
+	admin "google.golang.org/api/admin/directory/v1"
 )

 func newRedeemServer(body []byte) (*url.URL, *httptest.Server) {
@ -179,3 +182,37 @@ func TestGoogleProviderGetEmailAddressEmailMissing(t *testing.T) {
 	}

 }
+
+func TestGoogleProviderUserInGroup(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/users/member-by-email@example.com" {
+			fmt.Fprintln(w, "{}")
+		} else if r.URL.Path == "/users/non-member-by-email@example.com" {
+			fmt.Fprintln(w, "{}")
+		} else if r.URL.Path == "/users/member-by-id@example.com" {
+			fmt.Fprintln(w, "{\"id\": \"member-id\"}")
+		} else if r.URL.Path == "/users/non-member-by-id@example.com" {
+			fmt.Fprintln(w, "{\"id\": \"non-member-id\"}")
+		} else if r.URL.Path == "/groups/group@example.com/members" {
+			fmt.Fprintln(w, "{\"members\": [{\"email\": \"member-by-email@example.com\"}, {\"id\": \"member-id\", \"type\": \"USER\"}]}")
+		}
+	}))
+	defer ts.Close()
+
+	client := ts.Client()
+	service, err := admin.New(client)
+	service.BasePath = ts.URL
+	assert.Equal(t, nil, err)
+
+	result := userInGroup(service, []string{"group@example.com"}, "member-by-email@example.com")
+	assert.True(t, result)
+
+	result = userInGroup(service, []string{"group@example.com"}, "member-by-id@example.com")
+	assert.True(t, result)
+
+	result = userInGroup(service, []string{"group@example.com"}, "non-member-by-id@example.com")
+	assert.False(t, result)
+
+	result = userInGroup(service, []string{"group@example.com"}, "non-member-by-email@example.com")
+	assert.False(t, result)
+}
--- a/providers/internal_util.go
+++ b/providers/internal_util.go
@ -47,7 +47,7 @@ func stripParam(param, endpoint string) string {

 // validateToken returns true if token is valid
 func validateToken(p Provider, accessToken string, header http.Header) bool {
-	if accessToken == "" || p.Data().ValidateURL == nil {
+	if accessToken == "" || p.Data().ValidateURL == nil || p.Data().ValidateURL.String() == "" {
 		return false
 	}
 	endpoint := p.Data().ValidateURL.String()
--- a/providers/oidc.go
+++ b/providers/oidc.go
@ -15,6 +15,7 @@ type OIDCProvider struct {
 	*ProviderData

 	Verifier             *oidc.IDTokenVerifier
+	AllowUnverifiedEmail bool
 }

 // NewOIDCProvider initiates a new OIDCProvider
@ -119,7 +120,7 @@ func (p *OIDCProvider) createSessionState(ctx context.Context, token *oauth2.Tok
 		// TODO: Try getting email from /userinfo before falling back to Subject
 		claims.Email = claims.Subject
 	}
-	if claims.Verified != nil && !*claims.Verified {
+	if !p.AllowUnverifiedEmail && claims.Verified != nil && !*claims.Verified {
 		return nil, fmt.Errorf("email in id_token (%s) isn't verified", claims.Email)
 	}

@ -128,7 +129,7 @@ func (p *OIDCProvider) createSessionState(ctx context.Context, token *oauth2.Tok
 		IDToken:      rawIDToken,
 		RefreshToken: token.RefreshToken,
 		CreatedAt:    time.Now(),
-		ExpiresOn:    token.Expiry,
+		ExpiresOn:    idToken.Expiry,
 		Email:        claims.Email,
 		User:         claims.Subject,
 	}, nil