mirror of https://github.com/dexidp/dex.git
Browse Source
connector/microsoft implements authorization strategy via Microsoft's OAuth2 endpoint + Graph API. It allows to choose what kind of tenants are allowed to authenticate in Dex via Microsoft: * common - both personal and business/school accounts * organizations - only business/school accounts * consumers - only personal accounts * <tenant uuid> - only account of specific tenant Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>pull/1131/head
Pavel Borzenkov
8 years ago
6 changed files with 364 additions and 0 deletions
@ -0,0 +1,66 @@
|
||||
# Authentication through Microsoft |
||||
|
||||
## Overview |
||||
|
||||
One of the login options for dex uses the Microsoft OAuth2 flow to identify the |
||||
end user through their Microsoft account. |
||||
|
||||
When a client redeems a refresh token through dex, dex will re-query Microsoft |
||||
to update user information in the ID Token. To do this, __dex stores a readonly |
||||
Microsoft access and refresh tokens in its backing datastore.__ Users that |
||||
reject dex's access through Microsoft will also revoke all dex clients which |
||||
authenticated them through Microsoft. |
||||
|
||||
## Configuration |
||||
|
||||
Register a new application on https://apps.dev.microsoft.com via `Add an app` |
||||
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: microsoft |
||||
# Required field for connector id. |
||||
id: microsoft |
||||
# Required field for connector name. |
||||
name: Microsoft |
||||
config: |
||||
# Credentials can be string literals or pulled from the environment. |
||||
clientID: $MICROSOFT_APPLICATION_ID |
||||
clientSecret: $MICROSOFT_CLIENT_SECRET |
||||
redirectURI: http://127.0.0.1:5556/dex/callback |
||||
``` |
||||
|
||||
`tenant` configuration parameter controls what kinds of accounts may be |
||||
authenticated in dex. By default, all types of Microsoft accounts (consumers |
||||
and organizations) can authenticate in dex via Microsoft. To change this, set |
||||
the `tenant` parameter to one of the following: |
||||
|
||||
- `common`- both personal and business/school accounts can authenticate in dex |
||||
via Microsoft (default) |
||||
- `consumers` - only personal accounts can authenticate in dex |
||||
- `organizations` - only business/school accounts can authenticate in dex |
||||
- `<tenant uuid>` or `<tenant name>` - only accounts belonging to specific |
||||
tenant identified by either `<tenant uuid>` or `<tenant name>` can |
||||
authenticate in dex |
||||
|
||||
For example, the following snippet configures dex to only allow business/school |
||||
accounts: |
||||
|
||||
```yaml |
||||
connectors: |
||||
- type: microsoft |
||||
# Required field for connector id. |
||||
id: microsoft |
||||
# Required field for connector name. |
||||
name: Microsoft |
||||
config: |
||||
# Credentials can be string literals or pulled from the environment. |
||||
clientID: $MICROSOFT_APPLICATION_ID |
||||
clientSecret: $MICROSOFT_CLIENT_SECRET |
||||
redirectURI: http://127.0.0.1:5556/dex/callback |
||||
tenant: organizations |
||||
``` |
||||
@ -0,0 +1,282 @@
|
||||
// Package microsoft provides authentication strategies using Microsoft.
|
||||
package microsoft |
||||
|
||||
import ( |
||||
"context" |
||||
"encoding/json" |
||||
"errors" |
||||
"fmt" |
||||
"net/http" |
||||
"sync" |
||||
"time" |
||||
|
||||
"golang.org/x/oauth2" |
||||
|
||||
"github.com/coreos/dex/connector" |
||||
"github.com/sirupsen/logrus" |
||||
) |
||||
|
||||
const ( |
||||
apiURL = "https://graph.microsoft.com" |
||||
// Microsoft requires this scope to access user's profile
|
||||
scopeUser = "user.read" |
||||
) |
||||
|
||||
// Config holds configuration options for microsoft logins.
|
||||
type Config struct { |
||||
ClientID string `json:"clientID"` |
||||
ClientSecret string `json:"clientSecret"` |
||||
RedirectURI string `json:"redirectURI"` |
||||
Tenant string `json:"tenant"` |
||||
} |
||||
|
||||
// Open returns a strategy for logging in through Microsoft.
|
||||
func (c *Config) Open(id string, logger logrus.FieldLogger) (connector.Connector, error) { |
||||
m := microsoftConnector{ |
||||
redirectURI: c.RedirectURI, |
||||
clientID: c.ClientID, |
||||
clientSecret: c.ClientSecret, |
||||
tenant: c.Tenant, |
||||
logger: logger, |
||||
} |
||||
// By default allow logins from both personal and business/school
|
||||
// accounts.
|
||||
if m.tenant == "" { |
||||
m.tenant = "common" |
||||
} |
||||
|
||||
return &m, nil |
||||
} |
||||
|
||||
type connectorData struct { |
||||
AccessToken string `json:"accessToken"` |
||||
RefreshToken string `json:"refreshToken"` |
||||
Expiry time.Time `json:"expiry"` |
||||
} |
||||
|
||||
var ( |
||||
_ connector.CallbackConnector = (*microsoftConnector)(nil) |
||||
_ connector.RefreshConnector = (*microsoftConnector)(nil) |
||||
) |
||||
|
||||
type microsoftConnector struct { |
||||
redirectURI string |
||||
clientID string |
||||
clientSecret string |
||||
tenant string |
||||
logger logrus.FieldLogger |
||||
} |
||||
|
||||
func (c *microsoftConnector) oauth2Config(scopes connector.Scopes) *oauth2.Config { |
||||
microsoftScopes := []string{scopeUser} |
||||
|
||||
return &oauth2.Config{ |
||||
ClientID: c.clientID, |
||||
ClientSecret: c.clientSecret, |
||||
Endpoint: oauth2.Endpoint{ |
||||
AuthURL: "https://login.microsoftonline.com/" + c.tenant + "/oauth2/v2.0/authorize", |
||||
TokenURL: "https://login.microsoftonline.com/" + c.tenant + "/oauth2/v2.0/token", |
||||
}, |
||||
Scopes: microsoftScopes, |
||||
RedirectURL: c.redirectURI, |
||||
} |
||||
} |
||||
|
||||
func (c *microsoftConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) { |
||||
if c.redirectURI != callbackURL { |
||||
return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, c.redirectURI) |
||||
} |
||||
|
||||
return c.oauth2Config(scopes).AuthCodeURL(state), nil |
||||
} |
||||
|
||||
func (c *microsoftConnector) 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 := c.oauth2Config(s) |
||||
|
||||
ctx := r.Context() |
||||
|
||||
token, err := oauth2Config.Exchange(ctx, q.Get("code")) |
||||
if err != nil { |
||||
return identity, fmt.Errorf("microsoft: failed to get token: %v", err) |
||||
} |
||||
|
||||
client := oauth2Config.Client(ctx, token) |
||||
|
||||
user, err := c.user(ctx, client) |
||||
if err != nil { |
||||
return identity, fmt.Errorf("microsoft: get user: %v", err) |
||||
} |
||||
|
||||
identity = connector.Identity{ |
||||
UserID: user.ID, |
||||
Username: user.Name, |
||||
Email: user.Email, |
||||
EmailVerified: true, |
||||
} |
||||
|
||||
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("microsoft: marshal connector data: %v", err) |
||||
} |
||||
identity.ConnectorData = connData |
||||
} |
||||
|
||||
return identity, nil |
||||
} |
||||
|
||||
type tokenNotifyFunc func(*oauth2.Token) error |
||||
|
||||
// notifyRefreshTokenSource is essentially `oauth2.ResuseTokenSource` 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 (c *microsoftConnector) Refresh(ctx context.Context, s connector.Scopes, identity connector.Identity) (connector.Identity, error) { |
||||
if len(identity.ConnectorData) == 0 { |
||||
return identity, errors.New("microsoft: no upstream access token found") |
||||
} |
||||
|
||||
var data connectorData |
||||
if err := json.Unmarshal(identity.ConnectorData, &data); err != nil { |
||||
return identity, fmt.Errorf("microsoft: unmarshal access token: %v", err) |
||||
} |
||||
tok := &oauth2.Token{ |
||||
AccessToken: data.AccessToken, |
||||
RefreshToken: data.RefreshToken, |
||||
Expiry: data.Expiry, |
||||
} |
||||
|
||||
client := oauth2.NewClient(ctx, ¬ifyRefreshTokenSource{ |
||||
new: c.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("microsoft: marshal connector data: %v", err) |
||||
} |
||||
identity.ConnectorData = connData |
||||
return nil |
||||
}, |
||||
}) |
||||
user, err := c.user(ctx, client) |
||||
if err != nil { |
||||
return identity, fmt.Errorf("microsoft: get user: %v", err) |
||||
} |
||||
|
||||
identity.Username = user.Name |
||||
identity.Email = user.Email |
||||
|
||||
return identity, nil |
||||
} |
||||
|
||||
// https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/resources/user
|
||||
// id - The unique identifier for the user. Inherited from
|
||||
// directoryObject. Key. Not nullable. Read-only.
|
||||
// displayName - The name displayed in the address book for the user.
|
||||
// This is usually the combination of the user's first name,
|
||||
// middle initial and last name. This property is required
|
||||
// when a user is created and it cannot be cleared during
|
||||
// updates. Supports $filter and $orderby.
|
||||
// userPrincipalName - The user principal name (UPN) of the user.
|
||||
// The UPN is an Internet-style login name for the user
|
||||
// based on the Internet standard RFC 822. By convention,
|
||||
// this should map to the user's email name. The general
|
||||
// format is alias@domain, where domain must be present in
|
||||
// the tenant’s collection of verified domains. This
|
||||
// property is required when a user is created. The
|
||||
// verified domains for the tenant can be accessed from the
|
||||
// verifiedDomains property of organization. Supports
|
||||
// $filter and $orderby.
|
||||
type user struct { |
||||
ID string `json:"id"` |
||||
Name string `json:"displayName"` |
||||
Email string `json:"userPrincipalName"` |
||||
} |
||||
|
||||
func (c *microsoftConnector) user(ctx context.Context, client *http.Client) (u user, err error) { |
||||
// https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/user_get
|
||||
req, err := http.NewRequest("GET", apiURL+"/v1.0/me?$select=id,displayName,userPrincipalName", nil) |
||||
if err != nil { |
||||
return u, fmt.Errorf("new req: %v", err) |
||||
} |
||||
|
||||
resp, err := client.Do(req.WithContext(ctx)) |
||||
if err != nil { |
||||
return u, fmt.Errorf("get URL %v", err) |
||||
} |
||||
defer resp.Body.Close() |
||||
|
||||
if resp.StatusCode != http.StatusOK { |
||||
// https://developer.microsoft.com/en-us/graph/docs/concepts/errors
|
||||
var ge graphError |
||||
if err := json.NewDecoder(resp.Body).Decode(&struct { |
||||
Error *graphError `json:"error"` |
||||
}{&ge}); err != nil { |
||||
return u, fmt.Errorf("JSON error decode: %v", err) |
||||
} |
||||
return u, &ge |
||||
} |
||||
|
||||
if err := json.NewDecoder(resp.Body).Decode(&u); err != nil { |
||||
return u, fmt.Errorf("JSON decode: %v", err) |
||||
} |
||||
|
||||
return u, err |
||||
} |
||||
|
||||
type graphError struct { |
||||
Code string `json:"code"` |
||||
Message string `json:"message"` |
||||
} |
||||
|
||||
func (e *graphError) Error() string { |
||||
return e.Code + ": " + e.Message |
||||
} |
||||
|
||||
type oauth2Error struct { |
||||
error string |
||||
errorDescription string |
||||
} |
||||
|
||||
func (e *oauth2Error) Error() string { |
||||
if e.errorDescription == "" { |
||||
return e.error |
||||
} |
||||
return e.error + ": " + e.errorDescription |
||||
} |
||||
Loading…
Reference in new issue