import { KeyPair } from '../algorithms/publicKeyAlgorithm';
import { CancellationToken } from 'vscode-jsonrpc';
import { AuthenticationInfoRequestMessage, AuthenticationInfoResponseMessage } from '../messages/authenticationMessages';
/**
 * Indicates the type of authentication being requested by an SSH client or server when an
 * `SshSession.authenticating` event is raised.
 */
export declare enum SshAuthenticationType {
    /**
     * The client is attempting to authenticate without any credentials, or with only a
     * username, or is merely checking what authentication methods are supported by the server.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "none" method. With this method, all of the credential properties in the
     * `SshAuthenticatingEventArgs` are null.
     *
     * If the server app wishes to allow the client to authenticate with only a username, it may
     * return a principal for the user. Othwerwise, the "none" authentication method fails, and
     * the client may make a follow-up attempt to authenticate _with_ credentials.
     */
    clientNone = 0,
    /**
     * The client is attempting to authenticate with a client host public key.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "hostbased" method. The authentication handler must verify that the public key
     * actually belongs to the client host name, _and_ that the network address the client
     * connected from matches that host name, before returning a user principal to indicate
     * successful authentication.
     */
    clientHostBased = 1,
    /**
     * The client is attempting to authenticate with a username and password credential.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "password" method. The authentication handler must verify that the username
     * and password match known credentials on the server, before returning a user principal
     * to indicate successful authentication.
     */
    clientPassword = 2,
    /**
     * The client is querying whether authentication may be possible for a specified username and
     * public key without yet proving they have the private key.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "publickey" method _without_ providing a signature. The authentication handler
     * must verify that the username and public key match known credentials on the server. If
     * they match, an _unauthenticated_ principal should be returned. That indicates to the
     * client that they may proceed to actually authenticate using that username and public key.
     */
    clientPublicKeyQuery = 3,
    /**
     * The client is attempting to authenticate with a username and public key credential.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "publickey" method, including a signature that proves they have the private
     * key. The authentication handler must verify that the username and public key match known
     * credentials on the server, before returning a user principal to indicate successful
     * authentication.
     */
    clientPublicKey = 4,
    /**
     * The client is attempting to authenticate with interactive prompts.
     *
     * This event is raised by an `SshServerSession` when the client requests authentication
     * using the "keyboard-interactive" method. The event may be raised multiple times for the
     * same client to facilitate multi-step authentication.
     */
    clientInteractive = 5,
    /**
     * The server is attempting to authenticate with a public key credential.
     *
     * This event is raised by an `SshClientSession` when the server requests
     * authentication by providing a signature that proves it has the private key. The client
     * authentication handler must verify that the public key matches known public key(s) for
     * that server. Or if not known (often the case for the first time connecting to that server)
     * it may prompt the user to consent, and then save the public key for later reference. To
     * indicate successful authentication, the client authentication handler returns a principal
     * that represents the server.
     */
    serverPublicKey = 10
}
/**
 * Arguments for the `SshSession.Authenticating` event that is raised when a client
 * or server is requesting authentication.
 *
 * See `SshAuthenticationType` for a description of the different authentication methods and
 * how they map to properties in this event-args object.
 *
 * After validating the credentials, the event handler must set the `authenticationPromise`
 * property to a task that resolves to a principal object to indicate successful authentication.
 * That principal will then be associated with the session as the `SshSession.principal` property.
 */
export declare class SshAuthenticatingEventArgs {
    readonly authenticationType: SshAuthenticationType;
    constructor(authenticationType: SshAuthenticationType, { username, password, publicKey, clientHostname, clientUsername, infoRequest, infoResponse, }: {
        username?: string;
        password?: string;
        publicKey?: KeyPair;
        clientHostname?: string;
        clientUsername?: string;
        infoRequest?: AuthenticationInfoRequestMessage;
        infoResponse?: AuthenticationInfoResponseMessage;
    }, cancellation?: CancellationToken);
    /**
     * Gets the client's username on the server; valid for client password authentication, client
     * public-key authentication, or client host-based authentication.
     */
    readonly username: string | null;
    /**
     * Gets the client's password for the server; valid only for client password authentication.
     */
    readonly password: string | null;
    /**
     * Gets the server or client public key; valid for server authentication, client public-key
     * authentication, or client host-based authentication.
     */
    readonly publicKey: KeyPair | null;
    /**
     * Gets the client's host name; only valid for host-based authentication.
     */
    readonly clientHostname: string | null;
    /**
     * Gets the client's username on their client host; only valid for host-based authentication.
     */
    readonly clientUsername: string | null;
    /**
     * Gets or sets a request for more information for interactive authentication.
     *
     * The server may set this property when handling an interactive authenticating event to prompt
     * for information/credentials. The client may read this property when handling an interactive
     * authenticating event to determine what prompts to show and what information is requested.
     */
    infoRequest: AuthenticationInfoRequestMessage | null;
    /**
     * Gets or sets the client's responses to interactive prompts; valid only for interactive
     * authentication when information was previously requested via `InfoRequest`.
     */
    infoResponse: AuthenticationInfoResponseMessage | null;
    /**
     * Gets or sets a task to be filled in by the event handler to indicate whether async
     * authentication is successful.
     *
     * The authentication event handler must set this value to a task that resolves to a non-null
     * principal object to indicate successful authentication of the server or client. Either a
     * null task or a promise that resolves to null indicates an authentication failure.
     */
    authenticationPromise?: Promise<object | null>;
    /**
     * Gets a token that is cancelled if the session ends before the authentication handler
     * completes.
     */
    get cancellation(): CancellationToken;
    private cancellationValue;
    toString(): string;
}
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