text: /*
   * Dropbear - a SSH2 server
   * 
   * Copyright (c) 2002,2003 Matt Johnston
   * All rights reserved.
   * 
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   * 
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   * 
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE. */
  
  #ifndef DROPBEAR_AUTH_H_
  #define DROPBEAR_AUTH_H_
  
  #include "includes.h"
  #include "signkey.h"
  #include "chansession.h"
  
  void svr_authinitialise(void);
  void cli_authinitialise(void);
  
  /* Server functions */
  void recv_msg_userauth_request(void);
  void send_msg_userauth_failure(int partial, int incrfail);
  void send_msg_userauth_success(void);
  void send_msg_userauth_banner(buffer *msg);
  void svr_auth_password(void);
  void svr_auth_pubkey(void);
  void svr_auth_pam(void);
  
  #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  int svr_pubkey_allows_agentfwd(void);
  int svr_pubkey_allows_tcpfwd(void);
  int svr_pubkey_allows_x11fwd(void);
  int svr_pubkey_allows_pty(void);
  void svr_pubkey_set_forced_command(struct ChanSess *chansess);
  void svr_pubkey_options_cleanup(void);
  int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filename);
  #else
  /* no option : success */
  #define svr_pubkey_allows_agentfwd() 1
  #define svr_pubkey_allows_tcpfwd() 1
  #define svr_pubkey_allows_x11fwd() 1
  #define svr_pubkey_allows_pty() 1
  static inline void svr_pubkey_set_forced_command(struct ChanSess *chansess) { }
  static inline void svr_pubkey_options_cleanup(void) { }
  #define svr_add_pubkey_options(x,y,z) DROPBEAR_SUCCESS
  #endif
  
  /* Client functions */
  void recv_msg_userauth_failure(void);
  void recv_msg_userauth_success(void);
  void recv_msg_userauth_specific_60(void);
  void recv_msg_userauth_pk_ok(void);
  void recv_msg_userauth_info_request(void);
  void cli_get_user(void);
  void cli_auth_getmethods(void);
  int cli_auth_try(void);
  void recv_msg_userauth_banner(void);
  void cli_pubkeyfail(void);
  void cli_auth_password(void);
  int cli_auth_pubkey(void);
  void cli_auth_interactive(void);
  char* getpass_or_cancel(char* prompt);
  void cli_auth_pubkey_cleanup(void);
  
  
  #define MAX_USERNAME_LEN 25 /* arbitrary for the moment */
  
  #define AUTH_TYPE_NONE      1
  #define AUTH_TYPE_PUBKEY    (1 << 1)
  #define AUTH_TYPE_PASSWORD  (1 << 2)
  #define AUTH_TYPE_INTERACT  (1 << 3)
  
  #define AUTH_METHOD_NONE "none"
  #define AUTH_METHOD_NONE_LEN 4
  #define AUTH_METHOD_PUBKEY "publickey"
  #define AUTH_METHOD_PUBKEY_LEN 9
  #define AUTH_METHOD_PASSWORD "password"
  #define AUTH_METHOD_PASSWORD_LEN 8
  #define AUTH_METHOD_INTERACT "keyboard-interactive"
  #define AUTH_METHOD_INTERACT_LEN 20
  
  
  
  /* This structure is shared between server and client - it contains
   * relatively little extraneous bits when used for the client rather than the
   * server */
  struct AuthState {
  	char *username; /* This is the username the client presents to check. It
  					   is updated each run through, used for auth checking */
  	unsigned char authtypes; /* Flags indicating which auth types are still 
  								valid */
  	unsigned int failcount; /* Number of (failed) authentication attempts.*/
  	unsigned authdone : 1; /* 0 if we haven't authed, 1 if we have. Applies for
  							  client and server (though has differing 
  							  meanings). */
  	unsigned perm_warn : 1; /* Server only, set if bad permissions on 
  							   ~/.ssh/authorized_keys have already been
  							   logged. */
  
  	/* These are only used for the server */
  	uid_t pw_uid;
  	gid_t pw_gid;
  	char *pw_dir;
  	char *pw_shell;
  	char *pw_name;
  	char *pw_passwd;
  #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  	struct PubKeyOptions* pubkey_options;
  #endif
  };
  
  #ifdef ENABLE_SVR_PUBKEY_OPTIONS
  struct PubKeyOptions;
  struct PubKeyOptions {
  	/* Flags */
  	int no_port_forwarding_flag;
  	int no_agent_forwarding_flag;
  	int no_x11_forwarding_flag;
  	int no_pty_flag;
  	/* "command=" option. */
  	char * forced_command;
  };
  #endif
  
  #endif /* DROPBEAR_AUTH_H_ */
  