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/*
authfd.h
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Wed Mar 29 01:17:41 1995 ylo
Functions to interface with the SSH_AUTHENTICATION_FD socket.
*/
/* RCSID("$Id: authfd.h,v 1.2 1999/09/28 04:45:35 provos Exp $"); */
#ifndef AUTHFD_H
#define AUTHFD_H
#include "buffer.h"
/* Message types for SSH_AUTHENTICATION_FD socket. */
#define SSH_AUTHFD_CONNECT 0xf0
/* Messages for the authentication agent connection. */
#define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
#define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
#define SSH_AGENTC_RSA_CHALLENGE 3
#define SSH_AGENT_RSA_RESPONSE 4
#define SSH_AGENT_FAILURE 5
#define SSH_AGENT_SUCCESS 6
#define SSH_AGENTC_ADD_RSA_IDENTITY 7
#define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
#define SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9
typedef struct
{
int fd;
Buffer packet;
Buffer identities;
int howmany;
} AuthenticationConnection;
/* Returns the number of the authentication fd, or -1 if there is none. */
int ssh_get_authentication_fd();
/* This should be called for any descriptor returned by
ssh_get_authentication_fd(). Depending on the way the descriptor was
obtained, this may close the descriptor. */
void ssh_close_authentication_socket(int authfd);
/* Opens a socket to the authentication server. Returns the number of
that socket, or -1 if no connection could be made. */
int ssh_get_authentication_connection_fd();
/* Opens and connects a private socket for communication with the
authentication agent. Returns NULL if an error occurred and the
connection could not be opened. The connection should be closed by
the caller by calling ssh_close_authentication_connection(). */
AuthenticationConnection *ssh_get_authentication_connection();
/* Closes the connection to the authentication agent and frees any associated
memory. */
void ssh_close_authentication_connection(AuthenticationConnection *ac);
/* Returns the first authentication identity held by the agent.
Returns true if an identity is available, 0 otherwise.
The caller must initialize the integers before the call, and free the
comment after a successful call (before calling ssh_get_next_identity). */
int ssh_get_first_identity(AuthenticationConnection *connection,
int *bitsp, BIGNUM *e, BIGNUM *n, char **comment);
/* Returns the next authentication identity for the agent. Other functions
can be called between this and ssh_get_first_identity or two calls of this
function. This returns 0 if there are no more identities. The caller
must free comment after a successful return. */
int ssh_get_next_identity(AuthenticationConnection *connection,
int *bitsp, BIGNUM *e, BIGNUM *n, char **comment);
/* Requests the agent to decrypt the given challenge. Returns true if
the agent claims it was able to decrypt it. */
int ssh_decrypt_challenge(AuthenticationConnection *auth,
int bits, BIGNUM *e, BIGNUM *n, BIGNUM *challenge,
unsigned char session_id[16],
unsigned int response_type,
unsigned char response[16]);
/* Adds an identity to the authentication server. This call is not meant to
be used by normal applications. This returns true if the identity
was successfully added. */
int ssh_add_identity(AuthenticationConnection *connection,
RSA *key, const char *comment);
/* Removes the identity from the authentication server. This call is
not meant to be used by normal applications. This returns true if the
identity was successfully added. */
int ssh_remove_identity(AuthenticationConnection *connection,
RSA *key);
/* Removes all identities from the authentication agent. This call is not
meant to be used by normal applications. This returns true if the
operation was successful. */
int ssh_remove_all_identities(AuthenticationConnection *connection);
/* Closes the connection to the authentication agent. */
void ssh_close_authentication(AuthenticationConnection *connection);
#endif /* AUTHFD_H */
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