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dex/connector/atlassiancrowd/atlassiancrowd.go

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2019-08-09 13:05:50 +00:00
// Package atlassiancrowd provides authentication strategies using Atlassian Crowd.
package atlassiancrowd
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"strings"
"time"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/pkg/groups"
"github.com/dexidp/dex/pkg/log"
)
// Config holds configuration options for Atlassian Crowd connector.
// Crowd connectors require executing two queries, the first to find
// the user based on the username and password given to the connector.
// The second to use the user entry to search for groups.
//
// An example config:
//
// type: atlassian-crowd
// config:
// baseURL: https://crowd.example.com/context
// clientID: applogin
// clientSecret: appP4$$w0rd
// # users can be restricted by a list of groups
// groups:
// - admin
// # Prompt for username field
// usernamePrompt: Login
//
type Config struct {
BaseURL string `json:"baseURL"`
ClientID string `json:"clientID"`
ClientSecret string `json:"clientSecret"`
Groups []string `json:"groups"`
// UsernamePrompt allows users to override the username attribute (displayed
// in the username/password prompt). If unset, the handler will use.
// "Username".
UsernamePrompt string `json:"usernamePrompt"`
}
type crowdUser struct {
Key string
Name string
Active bool
Email string
}
type crowdGroups struct {
Groups []struct {
Name string
} `json:"groups"`
}
type crowdAuthentication struct {
Token string
User struct {
Name string
} `json:"user"`
CreatedDate uint64 `json:"created-date"`
ExpiryDate uint64 `json:"expiry-date"`
}
type crowdAuthenticationError struct {
Reason string
Message string
}
// Open returns a strategy for logging in through Atlassian Crowd
func (c *Config) Open(_ string, logger log.Logger) (connector.Connector, error) {
if c.BaseURL == "" {
return nil, fmt.Errorf("crowd: no baseURL provided for crowd connector")
}
return &crowdConnector{Config: *c, logger: logger}, nil
}
type crowdConnector struct {
Config
logger log.Logger
}
var (
_ connector.PasswordConnector = (*crowdConnector)(nil)
_ connector.RefreshConnector = (*crowdConnector)(nil)
)
type refreshData struct {
Username string `json:"username"`
}
func (c *crowdConnector) Login(ctx context.Context, s connector.Scopes, username, password string) (ident connector.Identity, validPass bool, err error) {
// make this check to avoid empty passwords.
if password == "" {
return connector.Identity{}, false, nil
}
// We want to return a different error if the user's password is incorrect vs
// if there was an error.
incorrectPass := false
var user crowdUser
client := c.crowdAPIClient()
if incorrectPass, err = c.authenticateWithPassword(ctx, client, username, password); err != nil {
return connector.Identity{}, false, err
}
if incorrectPass {
return connector.Identity{}, false, nil
}
if user, err = c.user(ctx, client, username); err != nil {
return connector.Identity{}, false, err
}
if ident, err = c.identityFromCrowdUser(user); err != nil {
return connector.Identity{}, false, err
}
if s.Groups {
userGroups, err := c.getGroups(ctx, client, s.Groups, ident.Username)
if err != nil {
return connector.Identity{}, false, fmt.Errorf("crowd: failed to query groups: %v", err)
}
ident.Groups = userGroups
}
if s.OfflineAccess {
refresh := refreshData{Username: username}
// Encode entry for following up requests such as the groups query and refresh attempts.
if ident.ConnectorData, err = json.Marshal(refresh); err != nil {
return connector.Identity{}, false, fmt.Errorf("crowd: marshal refresh data: %v", err)
}
}
return ident, true, nil
}
func (c *crowdConnector) Refresh(ctx context.Context, s connector.Scopes, ident connector.Identity) (connector.Identity, error) {
var data refreshData
if err := json.Unmarshal(ident.ConnectorData, &data); err != nil {
return ident, fmt.Errorf("crowd: failed to unmarshal internal data: %v", err)
}
var user crowdUser
client := c.crowdAPIClient()
user, err := c.user(ctx, client, data.Username)
if err != nil {
return ident, fmt.Errorf("crowd: get user %q: %v", data.Username, err)
}
newIdent, err := c.identityFromCrowdUser(user)
if err != nil {
return ident, err
}
newIdent.ConnectorData = ident.ConnectorData
// If user exists, authenticate it to prolong sso session.
err = c.authenticateUser(ctx, client, data.Username)
if err != nil {
return ident, fmt.Errorf("crowd: authenticate user: %v", err)
}
if s.Groups {
userGroups, err := c.getGroups(ctx, client, s.Groups, newIdent.Username)
if err != nil {
return connector.Identity{}, fmt.Errorf("crowd: failed to query groups: %v", err)
}
newIdent.Groups = userGroups
}
return newIdent, nil
}
func (c *crowdConnector) Prompt() string {
return c.UsernamePrompt
}
func (c *crowdConnector) crowdAPIClient() *http.Client {
return &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}
}
// authenticateWithPassword creates a new session for user and validates a password with Crowd API
func (c *crowdConnector) authenticateWithPassword(ctx context.Context, client *http.Client, username string, password string) (invalidPass bool, err error) {
req, err := c.crowdUserManagementRequest(ctx,
"POST",
"/session",
struct {
Username string `json:"username"`
Password string `json:"password"`
}{Username: username, Password: password},
)
if err != nil {
return false, fmt.Errorf("crowd: new auth pass api request %v", err)
}
resp, err := client.Do(req)
if err != nil {
return false, fmt.Errorf("crowd: api request %v", err)
}
defer resp.Body.Close()
body, err := c.validateCrowdResponse(resp)
if err != nil {
return false, err
}
if resp.StatusCode != http.StatusCreated {
var authError crowdAuthenticationError
if err := json.Unmarshal(body, &authError); err != nil {
return false, fmt.Errorf("unmarshal auth pass response: %d %v %q", resp.StatusCode, err, string(body))
}
if authError.Reason == "INVALID_USER_AUTHENTICATION" {
return true, nil
}
return false, fmt.Errorf("%s: %s", resp.Status, authError.Message)
}
var authResponse crowdAuthentication
if err := json.Unmarshal(body, &authResponse); err != nil {
return false, fmt.Errorf("decode auth response: %v", err)
}
return false, nil
}
// authenticateUser creates a new session for user without password validations with Crowd API
func (c *crowdConnector) authenticateUser(ctx context.Context, client *http.Client, username string) error {
req, err := c.crowdUserManagementRequest(ctx,
"POST",
"/session?validate-password=false",
struct {
Username string `json:"username"`
}{Username: username},
)
if err != nil {
return fmt.Errorf("crowd: new auth api request %v", err)
}
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("crowd: api request %v", err)
}
defer resp.Body.Close()
body, err := c.validateCrowdResponse(resp)
if err != nil {
return err
}
if resp.StatusCode != http.StatusCreated {
return fmt.Errorf("%s: %s", resp.Status, body)
}
var authResponse crowdAuthentication
if err := json.Unmarshal(body, &authResponse); err != nil {
return fmt.Errorf("decode auth response: %v", err)
}
return nil
}
// user retrieves user info from Crowd API
func (c *crowdConnector) user(ctx context.Context, client *http.Client, username string) (crowdUser, error) {
var user crowdUser
req, err := c.crowdUserManagementRequest(ctx,
"GET",
fmt.Sprintf("/user?username=%s", username),
nil,
)
if err != nil {
return user, fmt.Errorf("crowd: new user api request %v", err)
}
resp, err := client.Do(req)
if err != nil {
return user, fmt.Errorf("crowd: api request %v", err)
}
defer resp.Body.Close()
body, err := c.validateCrowdResponse(resp)
if err != nil {
return user, err
}
if resp.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s: %s", resp.Status, body)
}
if err := json.Unmarshal(body, &user); err != nil {
return user, fmt.Errorf("failed to decode response: %v", err)
}
return user, nil
}
// groups retrieves groups from Crowd API
func (c *crowdConnector) groups(ctx context.Context, client *http.Client, username string) (userGroups []string, err error) {
var crowdGroups crowdGroups
req, err := c.crowdUserManagementRequest(ctx,
"GET",
fmt.Sprintf("/user/group/nested?username=%s", username),
nil,
)
if err != nil {
return nil, fmt.Errorf("crowd: new groups api request %v", err)
}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("crowd: api request %v", err)
}
defer resp.Body.Close()
body, err := c.validateCrowdResponse(resp)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("%s: %s", resp.Status, body)
}
if err := json.Unmarshal(body, &crowdGroups); err != nil {
return nil, fmt.Errorf("failed to decode response: %v", err)
}
for _, group := range crowdGroups.Groups {
userGroups = append(userGroups, group.Name)
}
return userGroups, nil
}
// identityFromCrowdUser converts crowdUser to Identity
func (c *crowdConnector) identityFromCrowdUser(user crowdUser) (connector.Identity, error) {
identity := connector.Identity{
Username: user.Name,
UserID: user.Key,
Email: user.Email,
EmailVerified: true,
}
return identity, nil
}
// getGroups retrieves a list of user's groups and filters it
func (c *crowdConnector) getGroups(ctx context.Context, client *http.Client, groupScope bool, userLogin string) ([]string, error) {
crowdGroups, err := c.groups(ctx, client, userLogin)
if err != nil {
return nil, err
}
if len(c.Groups) > 0 {
filteredGroups := groups.Filter(crowdGroups, c.Groups)
if len(filteredGroups) == 0 {
return nil, fmt.Errorf("crowd: user %q is not in any of the required groups", userLogin)
}
return filteredGroups, nil
} else if groupScope {
return crowdGroups, nil
}
return nil, nil
}
// crowdUserManagementRequest create a http.Request with basic auth, json payload and Accept header
func (c *crowdConnector) crowdUserManagementRequest(ctx context.Context, method string, apiURL string, jsonPayload interface{}) (*http.Request, error) {
var body io.Reader
if jsonPayload != nil {
jsonData, err := json.Marshal(jsonPayload)
if err != nil {
return nil, fmt.Errorf("crowd: marshal API json payload: %v", err)
}
body = bytes.NewReader(jsonData)
}
req, err := http.NewRequest(method, fmt.Sprintf("%s/rest/usermanagement/1%s", c.BaseURL, apiURL), body)
if err != nil {
return nil, fmt.Errorf("new API req: %v", err)
}
req = req.WithContext(ctx)
// Crowd API requires a basic auth
req.SetBasicAuth(c.ClientID, c.ClientSecret)
req.Header.Set("Accept", "application/json")
if jsonPayload != nil {
req.Header.Set("Content-type", "application/json")
}
return req, nil
}
// validateCrowdResponse validates unique not JSON responses from API
func (c *crowdConnector) validateCrowdResponse(resp *http.Response) ([]byte, error) {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("crowd: read user body: %v", err)
}
if resp.StatusCode == http.StatusForbidden && strings.Contains(string(body), "The server understood the request but refuses to authorize it.") {
c.logger.Debugf("crowd response validation failed: %s", string(body))
return nil, fmt.Errorf("dex is forbidden from making requests to the Atlassian Crowd application by URL %q", c.BaseURL)
}
if resp.StatusCode == http.StatusUnauthorized && string(body) == "Application failed to authenticate" {
c.logger.Debugf("crowd response validation failed: %s", string(body))
return nil, fmt.Errorf("dex failed to authenticate Crowd Application with ID %q", c.ClientID)
}
return body, nil
}