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Add Bitbucket connector

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This commit is contained in:
Ed Tan 2018-09-30 15:08:07 -04:00
parent b58053eefc
commit 8c75d85b60
7 changed files with 621 additions and 1 deletions
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30
Documentation/connectors/bitbucket.md Normal file
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@ -0,0 +1,30 @@
# Authentication through Bitbucket Cloud
## Overview
One of the login options for dex uses the Bitbucket OAuth2 flow to identify the end user through their Bitbucket account.
When a client redeems a refresh token through dex, dex will re-query Bitbucket to update user information in the ID Token. To do this, __dex stores a readonly Bitbucket access token in its backing datastore.__ Users that reject dex's access through Bitbucket will also revoke all dex clients which authenticated them through Bitbucket.
## Configuration
Register a new OAuth consumer with [Bitbucket](https://confluence.atlassian.com/bitbucket/oauth-on-bitbucket-cloud-238027431.html) ensuring the callback URL is `(dex issuer)/callback`. For example if dex is listening at the non-root path `https://auth.example.com/dex` the callback would be `https://auth.example.com/dex/callback`.
The following is an example of a configuration for `examples/config-dev.yaml`:
```yaml
connectors:
- type: bitbucket
# Required field for connector id.
id: bitbucket
# Required field for connector name.
name: Bitbucket
config:
# Credentials can be string literals or pulled from the environment.
clientID: $BITBUCKET_CLIENT_ID
clientSecret: BITBUCKET_CLIENT_SECRET
redirectURI: http://127.0.0.1:5556/dex/callback
# Optional teams, communicated through the "groups" scope.
teams:
- my-team
```

1
README.md
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@ -73,6 +73,7 @@ Dex implements the following connectors:
| [LinkedIn](Documentation/connectors/linkedin.md) | yes | no | beta | |
| [Microsoft](Documentation/connectors/microsoft.md) | yes | yes | beta | |
| [AuthProxy](Documentation/connectors/authproxy.md) | no | no | alpha | Authentication proxies such as Apache2 mod_auth, etc. |
| [Bitbucket Cloud](Documentation/connectors/bitbucket.md) | yes | yes | alpha | |
Stable, beta, and alpha are defined as:

446
connector/bitbucket/bitbucket.go Normal file
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// Package bitbucket provides authentication strategies using Bitbucket.
package bitbucket
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"sync"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/bitbucket"
"github.com/sirupsen/logrus"
"github.com/dexidp/dex/connector"
)
const (
apiURL = "https://api.bitbucket.org/2.0"
// Bitbucket requires this scope to access '/user' API endpoints.
scopeAccount = "account"
// Bitbucket requires this scope to access '/user/emails' API endpoints.
scopeEmail = "email"
// Bitbucket requires this scope to access '/teams' API endpoints
// which are used when a client includes the 'groups' scope.
scopeTeams = "team"
)
// Config holds configuration options for Bitbucket logins.
type Config struct {
ClientID string `json:"clientID"`
ClientSecret string `json:"clientSecret"`
RedirectURI string `json:"redirectURI"`
Teams []string `json:"teams"`
}
// Open returns a strategy for logging in through Bitbucket.
func (c *Config) Open(id string, logger logrus.FieldLogger) (connector.Connector, error) {
b := bitbucketConnector{
redirectURI: c.RedirectURI,
teams: c.Teams,
clientID: c.ClientID,
clientSecret: c.ClientSecret,
apiURL: apiURL,
logger: logger,
}
return &b, nil
}
type connectorData struct {
AccessToken string `json:"accessToken"`
RefreshToken string `json:"refreshToken"`
Expiry time.Time `json:"expiry"`
}
var (
_ connector.CallbackConnector = (*bitbucketConnector)(nil)
_ connector.RefreshConnector = (*bitbucketConnector)(nil)
)
type bitbucketConnector struct {
redirectURI string
teams []string
clientID string
clientSecret string
logger logrus.FieldLogger
// apiURL defaults to "https://api.bitbucket.org/2.0"
apiURL string
// the following are used only for tests
hostName string
httpClient *http.Client
}
// groupsRequired returns whether dex requires Bitbucket's 'team' scope.
func (b *bitbucketConnector) groupsRequired(groupScope bool) bool {
return len(b.teams) > 0 || groupScope
}
func (b *bitbucketConnector) oauth2Config(scopes connector.Scopes) *oauth2.Config {
bitbucketScopes := []string{scopeAccount, scopeEmail}
if b.groupsRequired(scopes.Groups) {
bitbucketScopes = append(bitbucketScopes, scopeTeams)
}
endpoint := bitbucket.Endpoint
if b.hostName != "" {
endpoint = oauth2.Endpoint{
AuthURL: "https://" + b.hostName + "/site/oauth2/authorize",
TokenURL: "https://" + b.hostName + "/site/oauth2/access_token",
}
}
return &oauth2.Config{
ClientID: b.clientID,
ClientSecret: b.clientSecret,
Endpoint: endpoint,
Scopes: bitbucketScopes,
}
}
func (b *bitbucketConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) {
if b.redirectURI != callbackURL {
return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, b.redirectURI)
}
return b.oauth2Config(scopes).AuthCodeURL(state), nil
}
type oauth2Error struct {
error string
errorDescription string
}
func (e *oauth2Error) Error() string {
if e.errorDescription == "" {
return e.error
}
return e.error + ": " + e.errorDescription
}
func (b *bitbucketConnector) HandleCallback(s connector.Scopes, r *http.Request) (identity connector.Identity, err error) {
q := r.URL.Query()
if errType := q.Get("error"); errType != "" {
return identity, &oauth2Error{errType, q.Get("error_description")}
}
oauth2Config := b.oauth2Config(s)
ctx := r.Context()
if b.httpClient != nil {
ctx = context.WithValue(r.Context(), oauth2.HTTPClient, b.httpClient)
}
token, err := oauth2Config.Exchange(ctx, q.Get("code"))
if err != nil {
return identity, fmt.Errorf("bitbucket: failed to get token: %v", err)
}
client := oauth2Config.Client(ctx, token)
user, err := b.user(ctx, client)
if err != nil {
return identity, fmt.Errorf("bitbucket: get user: %v", err)
}
identity = connector.Identity{
UserID: user.UUID,
Username: user.Username,
Email: user.Email,
EmailVerified: true,
}
if b.groupsRequired(s.Groups) {
groups, err := b.getGroups(ctx, client, s.Groups, user.Username)
if err != nil {
return identity, err
}
identity.Groups = groups
}
if s.OfflineAccess {
data := connectorData{
AccessToken: token.AccessToken,
RefreshToken: token.RefreshToken,
Expiry: token.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return identity, fmt.Errorf("bitbucket: marshal connector data: %v", err)
}
identity.ConnectorData = connData
}
return identity, nil
}
// Refreshing tokens
// https://github.com/golang/oauth2/issues/84#issuecomment-332860871
type tokenNotifyFunc func(*oauth2.Token) error
// notifyRefreshTokenSource is essentially `oauth2.ReuseTokenSource` with `TokenNotifyFunc` added.
type notifyRefreshTokenSource struct {
new oauth2.TokenSource
mu sync.Mutex // guards t
t *oauth2.Token
f tokenNotifyFunc // called when token refreshed so new refresh token can be persisted
}
// Token returns the current token if it's still valid, else will
// refresh the current token (using r.Context for HTTP client
// information) and return the new one.
func (s *notifyRefreshTokenSource) Token() (*oauth2.Token, error) {
s.mu.Lock()
defer s.mu.Unlock()
if s.t.Valid() {
return s.t, nil
}
t, err := s.new.Token()
if err != nil {
return nil, err
}
s.t = t
return t, s.f(t)
}
func (b *bitbucketConnector) Refresh(ctx context.Context, s connector.Scopes, identity connector.Identity) (connector.Identity, error) {
if len(identity.ConnectorData) == 0 {
return identity, errors.New("bitbucket: no upstream access token found")
}
var data connectorData
if err := json.Unmarshal(identity.ConnectorData, &data); err != nil {
return identity, fmt.Errorf("bitbucket: unmarshal access token: %v", err)
}
tok := &oauth2.Token{
AccessToken: data.AccessToken,
RefreshToken: data.RefreshToken,
Expiry: data.Expiry,
}
client := oauth2.NewClient(ctx, &notifyRefreshTokenSource{
new: b.oauth2Config(s).TokenSource(ctx, tok),
t: tok,
f: func(tok *oauth2.Token) error {
data := connectorData{
AccessToken: tok.AccessToken,
RefreshToken: tok.RefreshToken,
Expiry: tok.Expiry,
}
connData, err := json.Marshal(data)
if err != nil {
return fmt.Errorf("bitbucket: marshal connector data: %v", err)
}
identity.ConnectorData = connData
return nil
},
})
user, err := b.user(ctx, client)
if err != nil {
return identity, fmt.Errorf("bitbucket: get user: %v", err)
}
identity.Username = user.Username
identity.Email = user.Email
if b.groupsRequired(s.Groups) {
groups, err := b.getGroups(ctx, client, s.Groups, user.Username)
if err != nil {
return identity, err
}
identity.Groups = groups
}
return identity, nil
}
// Bitbucket pagination wrapper
type pagedResponse struct {
Size int `json:"size"`
Page int `json:"page"`
PageLen int `json:"pagelen"`
Next *string `json:"next"`
Previous *string `json:"previous"`
}
// user holds Bitbucket user information (relevant to dex) as defined by
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user
type user struct {
Username string `json:"username"`
DisplayName string `json:"display_name"`
UUID string `json:"uuid"`
Email string `json:"email"`
}
// user queries the Bitbucket API for profile information using the provided client.
//
// The HTTP client is expected to be constructed by the golang.org/x/oauth2 package,
// which inserts a bearer token as part of the request.
func (b *bitbucketConnector) user(ctx context.Context, client *http.Client) (user, error) {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user
var (
u user
err error
)
if err = get(ctx, client, b.apiURL+"/user", &u); err != nil {
return u, err
}
if u.Email, err = b.userEmail(ctx, client); err != nil {
return u, err
}
return u, nil
}
// userEmail holds Bitbucket user email information as defined by
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user/emails
type userEmail struct {
IsPrimary bool `json:"is_primary"`
IsConfirmed bool `json:"is_confirmed"`
Type string `json:"type"`
Email string `json:"email"`
}
type userEmailResponse struct {
pagedResponse
Values []userEmail
}
// userEmail returns the users primary, confirmed email
//
// The HTTP client is expected to be constructed by the golang.org/x/oauth2 package,
// which inserts a bearer token as part of the request.
func (b *bitbucketConnector) userEmail(ctx context.Context, client *http.Client) (string, error) {
apiURL := b.apiURL + "/user/emails"
for {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/user/emails
var response userEmailResponse
if err := get(ctx, client, apiURL, &response); err != nil {
return "", err
}
for _, email := range response.Values {
if email.IsConfirmed && email.IsPrimary {
return email.Email, nil
}
}
if response.Next == nil {
break
}
}
return "", errors.New("bitbucket: user has no confirmed, primary email")
}
// getGroups retrieves Bitbucket teams a user is in, if any.
func (b *bitbucketConnector) getGroups(ctx context.Context, client *http.Client, groupScope bool, userLogin string) ([]string, error) {
bitbucketTeams, err := b.userTeams(ctx, client)
if err != nil {
return nil, err
}
if len(b.teams) > 0 {
filteredTeams := filterTeams(bitbucketTeams, b.teams)
if len(filteredTeams) == 0 {
return nil, fmt.Errorf("bitbucket: user %q not in required teams", userLogin)
} else {
return filteredTeams, nil
}
} else if groupScope {
return bitbucketTeams, nil
}
return nil, nil
}
// Filter the users' team memberships by 'teams' from config.
func filterTeams(userTeams, configTeams []string) (teams []string) {
teamFilter := make(map[string]struct{})
for _, team := range configTeams {
if _, ok := teamFilter[team]; !ok {
teamFilter[team] = struct{}{}
}
}
for _, team := range userTeams {
if _, ok := teamFilter[team]; ok {
teams = append(teams, team)
}
}
return
}
type team struct {
Username string `json:"username"` // Username is actually the team name
}
type userTeamsResponse struct {
pagedResponse
Values []team
}
func (b *bitbucketConnector) userTeams(ctx context.Context, client *http.Client) ([]string, error) {
apiURL, teams := b.apiURL+"/teams?role=member", []string{}
for {
// https://developer.atlassian.com/bitbucket/api/2/reference/resource/teams
var response userTeamsResponse
if err := get(ctx, client, apiURL, &response); err != nil {
return nil, fmt.Errorf("bitbucket: get user teams: %v", err)
}
for _, team := range response.Values {
teams = append(teams, team.Username)
}
if response.Next == nil {
break
}
}
return teams, nil
}
// get creates a "GET `apiURL`" request with context, sends the request using
// the client, and decodes the resulting response body into v.
// Any errors encountered when building requests, sending requests, and
// reading and decoding response data are returned.
func get(ctx context.Context, client *http.Client, apiURL string, v interface{}) error {
req, err := http.NewRequest("GET", apiURL, nil)
if err != nil {
return fmt.Errorf("bitbucket: new req: %v", err)
}
req = req.WithContext(ctx)
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("bitbucket: get URL %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("bitbucket: read body: %v", err)
}
return fmt.Errorf("%s: %s", resp.Status, body)
}
if err := json.NewDecoder(resp.Body).Decode(v); err != nil {
return fmt.Errorf("failed to decode response: %v", err)
}
return nil
}

124
connector/bitbucket/bitbucket_test.go Normal file
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@ -0,0 +1,124 @@
package bitbucket
import (
"context"
"crypto/tls"
"encoding/json"
"net/http"
"net/http/httptest"
"net/url"
"reflect"
"testing"
"github.com/dexidp/dex/connector"
)
func TestUserGroups(t *testing.T) {
teamsResponse := userTeamsResponse{
pagedResponse: pagedResponse{
Size: 3,
Page: 1,
PageLen: 10,
},
Values: []team{
{Username: "team-1"},
{Username: "team-2"},
{Username: "team-3"},
},
}
s := newTestServer(map[string]interface{}{
"/teams?role=member": teamsResponse,
})
connector := bitbucketConnector{apiURL: s.URL}
groups, err := connector.userTeams(context.Background(), newClient())
expectNil(t, err)
expectEquals(t, groups, []string{
"team-1",
"team-2",
"team-3",
})
s.Close()
}
func TestUserWithoutTeams(t *testing.T) {
s := newTestServer(map[string]interface{}{
"/teams?role=member": userTeamsResponse{},
})
connector := bitbucketConnector{apiURL: s.URL}
groups, err := connector.userTeams(context.Background(), newClient())
expectNil(t, err)
expectEquals(t, len(groups), 0)
s.Close()
}
func TestUsernameIncludedInFederatedIdentity(t *testing.T) {
s := newTestServer(map[string]interface{}{
"/user": user{Username: "some-login"},
"/user/emails": userEmailResponse{
pagedResponse: pagedResponse{
Size: 1,
Page: 1,
PageLen: 10,
},
Values: []userEmail{{
Email: "some@email.com",
IsConfirmed: true,
IsPrimary: true,
}},
},
"/site/oauth2/access_token": map[string]interface{}{
"access_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9",
"expires_in": "30",
},
})
hostURL, err := url.Parse(s.URL)
expectNil(t, err)
req, err := http.NewRequest("GET", hostURL.String(), nil)
expectNil(t, err)
bitbucketConnector := bitbucketConnector{apiURL: s.URL, hostName: hostURL.Host, httpClient: newClient()}
identity, err := bitbucketConnector.HandleCallback(connector.Scopes{}, req)
expectNil(t, err)
expectEquals(t, identity.Username, "some-login")
s.Close()
}
func newTestServer(responses map[string]interface{}) *httptest.Server {
return httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
json.NewEncoder(w).Encode(responses[r.URL.String()])
}))
}
func newClient() *http.Client {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
return &http.Client{Transport: tr}
}
func expectNil(t *testing.T, a interface{}) {
if a != nil {
t.Errorf("Expected %+v to equal nil", a)
}
}
func expectEquals(t *testing.T, a interface{}, b interface{}) {
if !reflect.DeepEqual(a, b) {
t.Errorf("Expected %+v to equal %+v", a, b)
}
}

3
glide.lock generated
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@ -1,5 +1,5 @@
hash: 12d0ad2fc0df4ab221e45c1ba7821708b908033c82741e250cc46dcd445b67eb
updated: 2018-09-18T23:51:30.787348994+02:00
updated: 2018-09-30T14:07:57.901347233-04:00
imports:
- name: github.com/beevik/etree
version: 4cd0dd976db869f817248477718071a28e978df0
@ -124,6 +124,7 @@ imports:
- name: golang.org/x/oauth2
version: 08c8d727d2392d18286f9f88ad775ad98f09ab33
subpackages:
- bitbucket
- github
- internal
- name: golang.org/x/sys

2
server/server.go
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@ -24,6 +24,7 @@ import (
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/connector/authproxy"
"github.com/dexidp/dex/connector/bitbucket"
"github.com/dexidp/dex/connector/github"
"github.com/dexidp/dex/connector/gitlab"
"github.com/dexidp/dex/connector/ldap"
@ -439,6 +440,7 @@ var ConnectorsConfig = map[string]func() ConnectorConfig{
"authproxy": func() ConnectorConfig { return new(authproxy.Config) },
"linkedin": func() ConnectorConfig { return new(linkedin.Config) },
"microsoft": func() ConnectorConfig { return new(microsoft.Config) },
"bitbucket": func() ConnectorConfig { return new(bitbucket.Config) },
// Keep around for backwards compatibility.
"samlExperimental": func() ConnectorConfig { return new(saml.Config) },
}

16
vendor/golang.org/x/oauth2/bitbucket/bitbucket.go generated vendored Normal file
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@ -0,0 +1,16 @@
// Copyright 2015 The oauth2 Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package bitbucket provides constants for using OAuth2 to access Bitbucket.
package bitbucket
import (
"golang.org/x/oauth2"
)
// Endpoint is Bitbucket's OAuth 2.0 endpoint.
var Endpoint = oauth2.Endpoint{
AuthURL: "https://bitbucket.org/site/oauth2/authorize",
TokenURL: "https://bitbucket.org/site/oauth2/access_token",
}