oauth2_proxy/providers/azure.go

196 lines
4.4 KiB
Go

package providers
import (
"errors"
"fmt"
"net/http"
"net/url"
"encoding/json"
"io/ioutil"
"bytes"
"time"
"github.com/bitly/go-simplejson"
"github.com/pusher/oauth2_proxy/pkg/apis/sessions"
"github.com/pusher/oauth2_proxy/pkg/logger"
"github.com/pusher/oauth2_proxy/pkg/requests"
)
// AzureProvider represents an Azure based Identity Provider
type AzureProvider struct {
*ProviderData
Tenant string
}
// NewAzureProvider initiates a new AzureProvider
func NewAzureProvider(p *ProviderData) *AzureProvider {
p.ProviderName = "Azure"
if p.ProfileURL == nil || p.ProfileURL.String() == "" {
p.ProfileURL = &url.URL{
Scheme: "https",
Host: "graph.windows.net",
Path: "/me",
RawQuery: "api-version=1.6",
}
}
if p.ProtectedResource == nil || p.ProtectedResource.String() == "" {
p.ProtectedResource = &url.URL{
Scheme: "https",
Host: "graph.windows.net",
}
}
if p.Scope == "" {
p.Scope = "openid"
}
return &AzureProvider{ProviderData: p}
}
// Configure defaults the AzureProvider configuration options
func (p *AzureProvider) Configure(tenant string) {
p.Tenant = tenant
if tenant == "" {
p.Tenant = "common"
}
if p.LoginURL == nil || p.LoginURL.String() == "" {
p.LoginURL = &url.URL{
Scheme: "https",
Host: "login.microsoftonline.com",
Path: "/" + p.Tenant + "/oauth2/authorize"}
}
if p.RedeemURL == nil || p.RedeemURL.String() == "" {
p.RedeemURL = &url.URL{
Scheme: "https",
Host: "login.microsoftonline.com",
Path: "/" + p.Tenant + "/oauth2/token",
}
}
}
func (p *AzureProvider) Redeem(redirectURL, code string) (s *sessions.SessionState, err error) {
if code == "" {
err = errors.New("missing code")
return
}
params := url.Values{}
params.Add("redirect_uri", redirectURL)
params.Add("client_id", p.ClientID)
params.Add("client_secret", p.ClientSecret)
params.Add("code", code)
params.Add("grant_type", "authorization_code")
if p.ProtectedResource != nil && p.ProtectedResource.String() != "" {
params.Add("resource", p.ProtectedResource.String())
}
var req *http.Request
req, err = http.NewRequest("POST", p.RedeemURL.String(), bytes.NewBufferString(params.Encode()))
if err != nil {
return
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
var resp *http.Response
resp, err = http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
var body []byte
body, err = ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return
}
if resp.StatusCode != 200 {
err = fmt.Errorf("got %d from %q %s", resp.StatusCode, p.RedeemURL.String(), body)
return
}
var jsonResponse struct {
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
ExpiresOn int64 `json:"expires_on,string"`
IDToken string `json:"id_token"`
}
err = json.Unmarshal(body, &jsonResponse)
if err != nil {
return
}
s = &sessions.SessionState{
AccessToken: jsonResponse.AccessToken,
IDToken: jsonResponse.IDToken,
CreatedAt: time.Now(),
ExpiresOn: time.Unix(jsonResponse.ExpiresOn, 0),
RefreshToken: jsonResponse.RefreshToken,
}
return
}
func getAzureHeader(accessToken string) http.Header {
header := make(http.Header)
header.Set("Authorization", fmt.Sprintf("Bearer %s", accessToken))
return header
}
func getEmailFromJSON(json *simplejson.Json) (string, error) {
var email string
var err error
email, err = json.Get("mail").String()
if err != nil || email == "" {
otherMails, otherMailsErr := json.Get("otherMails").Array()
if len(otherMails) > 0 {
email = otherMails[0].(string)
}
err = otherMailsErr
}
return email, err
}
// GetEmailAddress returns the Account email address
func (p *AzureProvider) GetEmailAddress(s *sessions.SessionState) (string, error) {
var email string
var err error
if s.AccessToken == "" {
return "", errors.New("missing access token")
}
req, err := http.NewRequest("GET", p.ProfileURL.String(), nil)
if err != nil {
return "", err
}
req.Header = getAzureHeader(s.AccessToken)
json, err := requests.Request(req)
if err != nil {
return "", err
}
email, err = getEmailFromJSON(json)
if err == nil && email != "" {
return email, err
}
email, err = json.Get("userPrincipalName").String()
if err != nil {
logger.Printf("failed making request %s", err)
return "", err
}
if email == "" {
logger.Printf("failed to get email address")
return "", err
}
return email, err
}