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libs/auth/src/common/login-strategies/README.md
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# Overview of Authentication at Bitwarden
> **Table of Contents**
>
> - [Authentication Methods](#authentication-methods)
> - [The Login Credentials Object](#the-login-credentials-object)
> - [The `LoginStrategyService` and our Login Strategies](#the-loginstrategyservice-and-our-login-strategies)
> - [The `logIn()` and `startLogIn()` Methods](#the-login-and-startlogin-methods)
> - [Handling the `AuthResult`](#handling-the-authresult)
> - [Diagram of Authentication Flows](#diagram-of-authentication-flows)
<br>
## Authentication Methods
Bitwarden provides 5 methods for logging in to Bitwarden, as defined in our [`AuthenticationType`](https://github.com/bitwarden/clients/blob/main/libs/common/src/auth/enums/authentication-type.ts) enum. They are:
1. [Login with Master Password](https://bitwarden.com/help/bitwarden-security-white-paper/#authentication-and-decryption)
2. [Login with Auth Request](https://bitwarden.com/help/log-in-with-device/) (aka Login with Device) &mdash; authenticate with a one-time access code
3. [Login with Single Sign-On](https://bitwarden.com/help/about-sso/) &mdash; authenticate with an SSO Identity Provider (IdP) through SAML or OpenID Connect (OIDC)
4. [Login with Passkey](https://bitwarden.com/help/login-with-passkeys/) (WebAuthn)
5. [Login with User API Key](https://bitwarden.com/help/personal-api-key/) &mdash; authenticate with an API key and secret
<br>
**Login Initiation**
_Angular Clients - Initiating Components_
A user begins the login process by entering their email on the `/login` screen (`LoginComponent`). From there, the user must click one of the following buttons to initiate a login method by navigating to that method's associated "initiating component":
- `"Continue"` &rarr; user stays on the `LoginComponent` and enters a Master Password
- `"Log in with device"` &rarr; navigates user to `LoginViaAuthRequestComponent`
- `"Use single sign-on"` &rarr; navigates user to `SsoComponent`
- `"Log in with passkey"` &rarr; navigates user to `LoginViaWebAuthnComponent`
- Note: Login with Passkey is currently not available on the Desktop client.
> [!NOTE]
>
> - Our Angular clients do not support the Login with User API Key method.
> &nbsp;
> - The Login with Master Password method is also used by the
> `RegistrationFinishComponent` and `CompleteTrialInitiationComponent` (the user automatically
> gets logged in with their Master Password after registration), as well as the `RecoverTwoFactorComponent`
> (the user logs in with their Master Password along with their 2FA recovery code).
<br>
_CLI Client - `LoginCommand`_
The CLI client supports the following login methods via the `LoginCommand`:
- Login with Master Password
- Login with Single Sign-On
- Login with User API Key (which can _only_ be initiated from the CLI client)
<br>
> [!IMPORTANT]
> While each authentication method has its own unique logic, this document discusses the
> logic that is _generally_ common to all authentication methods. It provides a high-level
> overview of authentication and as such will involve some abstraction and generalization.
<br>
## The Login Credentials Object
When the user presses the "submit" action on an initiating component (or via `LoginCommand` for CLI), we build a **login credentials object**, which contains the core credentials needed to initiate the specific login method.
For example, when the user clicks "Log in with master password" on the `LoginComponent`, we build a `PasswordLoginCredentials` object, which is defined as:
```typescript
export class PasswordLoginCredentials {
readonly type = AuthenticationType.Password;
constructor(
public email: string,
public masterPassword: string,
public twoFactor?: TokenTwoFactorRequest,
public masterPasswordPoliciesFromOrgInvite?: MasterPasswordPolicyOptions,
) {}
}
```
Notice that the `type` is automatically set to `AuthenticationType.Password`, and the `PasswordLoginCredentials` object simply requires an `email` and `masterPassword` to initiate the login method.
Each authentication method builds its own type of credentials object. These are defined in [`login-credentials.ts`](https://github.com/bitwarden/clients/blob/main/libs/auth/src/common/models/domain/login-credentials.ts).
- `PasswordLoginCredentials`
- `AuthRequestLoginCredentials`
- `SsoLoginCredentials`
- `WebAuthnLoginCredentials`
- `UserApiLoginCredentials`
After building the credentials object, we then call the `logIn()` method on the `LoginStrategyService`, passing in the credentials object as an argument: `LoginStrategyService.logIn(credentials)`
<br>
## The `LoginStrategyService` and our Login Strategies
The [`LoginStrategyService`](https://github.com/bitwarden/clients/blob/main/libs/auth/src/common/services/login-strategies/login-strategy.service.ts) acts as an orchestrator that determines which of our specific **login strategies** should be initialized and used for the login process.
> [!IMPORTANT]
> Our authentication methods are handled by different [login strategies](https://github.com/bitwarden/clients/tree/main/libs/auth/src/common/login-strategies), making use of the [Strategy Design Pattern](https://refactoring.guru/design-patterns/strategy). Those strategies are:
>
> - `PasswordLoginStrategy`
> - `AuthRequestLoginStrategy`
> - `SsoLoginStrategy`
> - `WebAuthnLoginStrategy`
> - `UserApiLoginStrategy`
>
> Each of those strategies extend the base [`LoginStrategy`](https://github.com/bitwarden/clients/blob/main/libs/auth/src/common/login-strategies/login.strategy.ts), which houses common login logic.
More specifically, within its `logIn()` method, the `LoginStrategyService` uses the `type` property on the credentials object to determine which specific login strategy to initialize.
For example, the `PasswordLoginCredentials` object has `type` of `AuthenticationType.Password`. This tells the `LoginStrategyService` to initialize and use the `PasswordLoginStrategy` for the login process.
Once the `LoginStrategyService` initializes the appropriate strategy, it then calls the `logIn()` method defined on _that_ particular strategy, passing on the credentials object as an argument. For example: `PasswordLoginStrategy.logIn(credentials)`
<br>
To summarize everything so far:
```bash
Initiating Component (Submit Action) # ex: LoginComponent.submit()
|
Build credentials object # ex: PasswordLoginCredentials
|
Call LoginStrategyService.logIn(credentials)
|
Initialize specific strategy # ex: PasswordLoginStrategy
|
Call strategy.logIn(credentials) # ex: PasswordLoginStrategy.logIn(credentials)
...
```
<br>
## The `logIn()` and `startLogIn()` Methods
Each login strategy has its own unique implementation of the `logIn()` method, but each `logIn()` method performs the following general logic with the help of the credentials object:
1. Build a `LoginStrategyData` object with a `TokenRequest` property
2. Cache the `LoginStrategyData` object
3. Call the `startLogIn()` method on the base `LoginStrategy`
Here are those steps in more detail:
1. **Build a `LoginStrategyData` object with a `TokenRequest` property**
Each strategy uses the credentials object to help build a type of `LoginStrategyData` object, which contains the data needed throughout the lifetime of the particular strategy, and must, at minimum, contain a `tokenRequest` property (more on this below).
```typescript
export abstract class LoginStrategyData {
tokenRequest:
| PasswordTokenRequest
| SsoTokenRequest
| WebAuthnLoginTokenRequest
| UserApiTokenRequest
| undefined;
abstract userEnteredEmail?: string;
}
```
Each strategy has its own class that implements the `LoginStrategyData` interface:
- `PasswordLoginStrategyData`
- `AuthRequestLoginStrategyData`
- `SsoLoginStrategyData`
- `WebAuthnLoginStrategyData`
- `UserApiLoginStrategyData`
So in our ongoing example that uses the "Login with Master Password" method, the call to `PasswordLoginStrategy.logIn(PasswordLoginCredentials)` would build a `PasswordLoginStrategyData` object that contains the data needed throughout the lifetime of the `PasswordLoginStrategy`.
That `PasswordLoginStrategyData` object is defined as:
```typescript
export class PasswordLoginStrategyData implements LoginStrategyData {
tokenRequest: PasswordTokenRequest;
userEnteredEmail: string;
localMasterKeyHash: string;
masterKey: MasterKey;
forcePasswordResetReason: ForceSetPasswordReason = ForceSetPasswordReason.None;
}
```
Each of the `LoginStrategyData` types have varying properties, but one property common to all is the `tokenRequest` property.
The `tokenRequest` property holds some type of [`TokenRequest`](https://github.com/bitwarden/clients/tree/main/libs/common/src/auth/models/request/identity-token) object based on the strategy:
- `PasswordTokenRequest` &mdash; used by both `PasswordLoginStrategy` and `AuthRequestLoginStrategy`
- `SsoTokenRequest`
- `WebAuthnLoginTokenRequest`
- `UserApiTokenRequest`
This `TokenRequest` object is _also_ built within the `logIn()` method and gets added to the `LoginStrategyData` object as the `tokenRequest` property.
<br />
2. **Cache the `LoginStrategyData` object**
Because a login attempt could "fail" due to a need for Two Factor Authentication (2FA) or New Device Verification (NDV), we need to preserve the `LoginStrategyData` so that we can re-use it later when the user provides their 2FA or NDV token. This way, the user does not need to completely re-enter all of their credentials.
The way we cache this `LoginStrategyData` is simply by saving it to a property called `cache` on the strategy. There will be more details on how this cache is used later on.
<br />
3. **Call the `startLogIn()` method on the base `LoginStrategy`**
Next, we call the `startLogIn()` method, which exists on the base `LoginStrategy` and is therefore common to all login strategies. The `startLogIn()` method does the following:
1. **Makes a `POST` request to the `/connect/token` endpoint on our Identity Server**
- `REQUEST`
The exact payload for this request is determined by the `TokenRequest` object. More specifically, the base `TokenRequest` class contains a `toIdentityToken()` method which gets overridden/extended by the sub-classes (`PasswordTokenRequest.toIdentityToken()`, etc.). This `toIdentityToken()` method produces the exact payload that gets sent to our `/connect/token` endpoint.
The payload includes OAuth2 parameters, such as `scope`, `client_id`, and `grant_type`, as well as any other credentials that the server needs to complete validation for the specific authentication method.
- `RESPONSE`
The Identity Server validates the request and then generates some type of `IdentityResponse`, which can be one of three types:
- [`IdentityTokenResponse`](https://github.com/bitwarden/clients/blob/main/libs/common/src/auth/models/response/identity-token.response.ts)
- Meaning: the user has been authenticated
- Response Contains:
- Authentication information, such as:
- An access token (which is a JWT with claims about the user)
- A refresh token
- Decryption information, such as:
- The user's master-key-encrypted user key (if the user has a master password), along with their KDF settings
- The user's user-key-encrypted private key
- A `userDecryptionOptions` object that contains information about which decryption options the user has available to them
- A flag that indicates if the user is required to set or change their master password
- Any master password policies the user is required to adhere to
- [`IdentityTwoFactorResponse`](https://github.com/bitwarden/clients/blob/main/libs/common/src/auth/models/response/identity-two-factor.response.ts)
- Meaning: the user needs to complete Two Factor Authentication
- Response Contains:
- A list of which 2FA providers the user has configured
- Any master password policies the user is required to adhere to
- [`IdentityDeviceVerificationResponse`](https://github.com/bitwarden/clients/blob/main/libs/common/src/auth/models/response/identity-device-verification.response.ts)
- Meaning: the user needs to verify their new device via [new device verification](https://bitwarden.com/help/new-device-verification/)
- Response Contains: a simple boolean property that states whether or not the device has been verified
2. **Calls one of the `process[IdentityType]Response()` methods**
Each of these methods builds and returns an [`AuthResult`](https://github.com/bitwarden/clients/blob/main/libs/common/src/auth/models/domain/auth-result.ts) object, which gets used later to determine how to direct the user after an authentication attempt.
The specific method that gets called depends on the type of the `IdentityResponse`:
- If `IdentityTokenResponse` &rarr; call `processTokenResponse()`
- Instantiates a new `AuthResult` object
- Calls `saveAccountInformation()` to initialize the account with information from the `IdentityTokenResponse`
- Decodes the access token (a JWT) to get information about the user (userId, email, etc.)
- Sets several things to state:
- The account (via `AccountService`)
- The user's environment
- `userDecryptionOptions`
- `masterPasswordUnlockData` (_if_ `userDecryptionOptions` allows for master password unlock):
- Salt
- KDF config
- Master-key-encrypted user key
- Access token and refresh token
- KDF config
- Premium status
- If the `IdentityTokenResponse` contains a `twoFactorToken` (because the user previously selected "remember me" for their 2FA method), set that token to state
- Sets cryptographic properties to state: master key, user key, private key
- Sets a `forceSetPasswordReason` to state (if necessary)
- Returns the `AuthResult`
- If `IdentityTwoFactorResponse` &rarr; call `processTwoFactorResponse()`
- Instantiates a new `AuthResult` object
- Sets `AuthResult.twoFactorProviders` to the list of 2FA providers from the `IdentityTwoFactorResponse`
- Sets that same list of of 2FA providers to global state (memory)
- Returns the `AuthResult`
- If `IdentityDeviceVerificationResponse` &rarr; call `processDeviceVerificationResponse()`
- Instantiates a new `AuthResult` object
- Sets `AuthResult.requiresDeviceVerification` to `true`
- Returns the `AuthResult`
<br>
## Handling the `AuthResult`
The `AuthResult` object that gets returned from the `process[IdentityType]Response()` method ultimately gets returned up through the chain of callers until it makes its way back to the initiating component (ex: the `LoginComponent` for Login with Master Password).
The initiating component will then use the information on that `AuthResult` to determine how to direct the user after an authentication attempt.
Below is a high-level overview of how the `AuthResult` is handled, but note again that there are abstractions in this diagram &mdash; it doesn't depict every edge case, and is just meant to give a general picture.
```bash
Initiating Component (Submit Action) < - - -
| \
LoginStrategyService.logIn() - \
| \ # AuthResult bubbles back up
strategy.logIn() - \ # through chain of callers
| \ # to the initiating component
startLogIn() - \
| \
process[IdentityType]Response() - \
| \
returns AuthResult - - - - - - - -
|
- - - - - - - - - - # Initiating component then
| # uses the AuthResult in
handleAuthResult(authResult) # handleAuthResult()
|
IF AuthResult.requiresTwoFactor
| # route user to /2fa to complete 2FA
|
IF AuthResult.requiresDeviceVerification
| # route user to /device-verification to complete NDV
|
# Otherwise, route user to /vault
```
<br />
Now for a more detailed breakdown of how the `AuthResult` is handled...
There are two broad types of scenarios that the user will fall into:
1. Re-submit scenarios
2. Successful Authentication scenarios
### Re-submit Scenarios
There are two cases where a user is required to provide additional information before they can be authenticated: Two Factor Authentication (2FA) and New Device Verification (NDV). In these scenarios, we actually need the user to "re-submit" their original request, along with their added 2FA or NDV token. But remember earlier that we cached the `LoginStrategyData`. This makes it so the user does not need to re-enter their original credentials. Instead, the user simply provides their 2FA or NDV token, we add it to their original (cached) `LoginStrategyData`, and then we re-submit the request.
Here is how these scenarios work:
**User must complete Two Factor Authentication**
1. Remember that when the server response is `IdentityTwoFactorResponse`, we set 2FA provider data into state, and also set `requiresTwoFactor` to `true` on the `AuthResult`.
2. When `AuthResult.requiresTwoFactor` is `true`, the specific login strategy exports its `LoginStrategyData` to the `LoginStrategyService`, where it gets stored in memory. This means the `LoginStrategyService` has a cache of the original request the user sent.
3. We route the user to `/2fa` (`TwoFactorAuthComponent`).
4. The user enters their 2FA token.
5. On submission, the `LoginStrategyService` calls `logInTwoFactor()` on the particular login strategy. This method then:
- Takes the cached `LoginStrategyData` (the user's original request), and appends the 2FA token onto the `TokenRequest`
- Calls `startLogIn()` again, this time using the updated `LoginStrategyData` that includes the 2FA token.
**User must complete New Device Verification**
Note that we currently only require new device verification on Master Password logins (`PasswordLoginStrategy`) for users who do not have a 2FA method setup.
1. Remember that when the server response is `IdentityDeviceVerificationResponse`, we set `requiresDeviceVerification` to `true` on the `AuthResult`.
2. When `AuthResult.requiresDeviceVerification` is `true`, the specific login strategy exports its `LoginStrategyData` to the `LoginStrategyService`, where it gets stored in memory. This means the `LoginStrategyService` has a cache of the original request the user sent.
3. We route the user to `/device-verification`.
4. The user enters their NDV token.
5. On submission, the `LoginStrategyService` calls `logInNewDeviceVerification()` on the particular login strategy. This method then:
- Takes the cached `LoginStrategyData` (the user's original request), and appends the NDV token onto the `TokenRequest`.
- Calls `startLogIn()` again, this time using the updated `LoginStrategyData` that includes the NDV token.
### Successful Authentication Scenarios
**User must change their password**
A user can be successfully authenticated but still required to set/change their master password. In this case, the user gets routed to the relevant set/change password component (`SetInitialPassword` or `ChangePassword`).
**User does not need to complete 2FA, NDV, or set/change their master password**
In this case, the user proceeds to their `/vault`.
**Trusted Device Encryption scenario**
If the user is on an untrusted device, they get routed to `/login-initiated` to select a decryption option. If the user is on a trusted device, they get routed to `/vault` because decryption can be done automatically.
<br>
## Diagram of Authentication Flows
Here is a high-level overview of what all of this looks like in the end.
<br>
![A Diagram of our Authentication Flows](./overview-of-authentication.svg)

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libs/common/src/auth/models/response/identity-token.response.ts
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@@ -11,13 +11,11 @@ import { MasterPasswordPolicyResponse } from "./master-password-policy.response"
import { UserDecryptionOptionsResponse } from "./user-decryption-options/user-decryption-options.response";
export class IdentityTokenResponse extends BaseResponse {
// Authentication Information
accessToken: string;
expiresIn?: number;
refreshToken?: string;
tokenType: string;
// Decryption Information
resetMasterPassword: boolean;
privateKey: string; // userKeyEncryptedPrivateKey
key?: EncString; // masterKeyEncryptedUserKey