[gssapi-openssh.git] / openssh / auth.h

/*	$OpenBSD: auth.h,v 1.37 2002/05/13 20:44:58 markus Exp $	*/

/*
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef AUTH_H
#define AUTH_H

#include "key.h"
#include "hostfile.h"
#include <openssl/rsa.h>

#ifdef HAVE_LOGIN_CAP
#include <login_cap.h>
#endif
#ifdef BSD_AUTH
#include <bsd_auth.h>
#endif
#ifdef KRB5
#include <krb5.h>
#endif

typedef struct Authctxt Authctxt;
typedef struct KbdintDevice KbdintDevice;

struct Authctxt {
	int		 success;
	int		 postponed;
	int		 valid;
	int		 attempt;
	int		 failures;
	char		*user;
	char		*service;
	struct passwd	*pw;
	char		*style;
	void		*kbdintctxt;
#ifdef BSD_AUTH
	auth_session_t	*as;
#endif
#ifdef KRB4
	char		*krb4_ticket_file;
#endif
#ifdef KRB5
	krb5_context	 krb5_ctx;
	krb5_auth_context krb5_auth_ctx;
	krb5_ccache	 krb5_fwd_ccache;
	krb5_principal	 krb5_user;
	char		*krb5_ticket_file;
#endif
};

/*
 * Keyboard interactive device:
 * init_ctx	returns: non NULL upon success
 * query	returns: 0 - success, otherwise failure
 * respond	returns: 0 - success, 1 - need further interaction,
 *		otherwise - failure
 */
struct KbdintDevice
{
	const char *name;
	void*	(*init_ctx)(Authctxt*);
	int	(*query)(void *ctx, char **name, char **infotxt,
		    u_int *numprompts, char ***prompts, u_int **echo_on);
	int	(*respond)(void *ctx, u_int numresp, char **responses);
	void	(*free_ctx)(void *ctx);
};

int      auth_rhosts(struct passwd *, const char *);
int
auth_rhosts2(struct passwd *, const char *, const char *, const char *);

int	 auth_rhosts_rsa(struct passwd *, char *, Key *);
int      auth_password(Authctxt *, const char *);
int      auth_rsa(struct passwd *, BIGNUM *);
int      auth_rsa_challenge_dialog(Key *);
BIGNUM	*auth_rsa_generate_challenge(Key *);
int	 auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
int	 auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);

int	 auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
int	 hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
int	 user_key_allowed(struct passwd *, Key *);

#ifdef KRB4
#include <krb.h>
int     auth_krb4(Authctxt *, KTEXT, char **);
int	auth_krb4_password(Authctxt *, const char *);
void    krb4_cleanup_proc(void *);

#ifdef AFS
#include <kafs.h>
int     auth_krb4_tgt(Authctxt *, const char *);
int     auth_afs_token(Authctxt *, const char *);
#endif /* AFS */

#endif /* KRB4 */

#ifdef KRB5
int	auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client);
int	auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
int	auth_krb5_password(Authctxt *authctxt, const char *password);
void	krb5_cleanup_proc(void *authctxt);
#endif /* KRB5 */

#include "auth-pam.h"
#include "auth2-pam.h"

Authctxt *do_authentication(void);
Authctxt *do_authentication2(void);

Authctxt *authctxt_new(void);
void	auth_log(Authctxt *, int, char *, char *);
void	userauth_finish(Authctxt *, int, char *);
int	auth_root_allowed(char *);

char	*auth2_read_banner(void);

void	privsep_challenge_enable(void);

int	auth2_challenge(Authctxt *, char *);
void	auth2_challenge_stop(Authctxt *);
int	bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
int	bsdauth_respond(void *, u_int, char **);
int	skey_query(void *, char **, char **, u_int *, char ***, u_int **);
int	skey_respond(void *, u_int, char **);

int	allowed_user(struct passwd *);
struct passwd * getpwnamallow(const char *user);

char	*get_challenge(Authctxt *);
int	verify_response(Authctxt *, const char *);

struct passwd * auth_get_user(void);

char	*expand_filename(const char *, struct passwd *);
char	*authorized_keys_file(struct passwd *);
char	*authorized_keys_file2(struct passwd *);

int
secure_filename(FILE *, const char *, struct passwd *, char *, size_t);

HostStatus
check_key_in_hostfiles(struct passwd *, Key *, const char *,
    const char *, const char *);

/* hostkey handling */
Key	*get_hostkey_by_index(int);
Key	*get_hostkey_by_type(int);
int	 get_hostkey_index(Key *);
int	 ssh1_session_key(BIGNUM *);

/* debug messages during authentication */
void	 auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
void	 auth_debug_send(void);
void	 auth_debug_reset(void);

#define AUTH_FAIL_MAX 6
#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"

#define SKEY_PROMPT "\nS/Key Password: "
#endif
Commit	Line	Data
700318f3	1	/* $OpenBSD: auth.h,v 1.37 2002/05/13 20:44:58 markus Exp $ */
e9a17296	2
3c0ef626	3	/*
	4	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*
3c0ef626	26	*/
e9a17296	27
3c0ef626	28	#ifndef AUTH_H
	29	#define AUTH_H
	30
	31	#include "key.h"
	32	#include "hostfile.h"
	33	#include <openssl/rsa.h>
	34
	35	#ifdef HAVE_LOGIN_CAP
	36	#include <login_cap.h>
	37	#endif
	38	#ifdef BSD_AUTH
	39	#include <bsd_auth.h>
	40	#endif
	41	#ifdef KRB5
	42	#include <krb5.h>
	43	#endif
	44
	45	typedef struct Authctxt Authctxt;
	46	typedef struct KbdintDevice KbdintDevice;
	47
	48	struct Authctxt {
	49	int success;
	50	int postponed;
	51	int valid;
	52	int attempt;
	53	int failures;
	54	char *user;
	55	char *service;
	56	struct passwd *pw;
	57	char *style;
	58	void *kbdintctxt;
	59	#ifdef BSD_AUTH
	60	auth_session_t *as;
	61	#endif
	62	#ifdef KRB4
	63	char *krb4_ticket_file;
	64	#endif
	65	#ifdef KRB5
	66	krb5_context krb5_ctx;
	67	krb5_auth_context krb5_auth_ctx;
	68	krb5_ccache krb5_fwd_ccache;
	69	krb5_principal krb5_user;
	70	char *krb5_ticket_file;
	71	#endif
	72	};
	73
	74	/*
	75	* Keyboard interactive device:
e9a17296	76	* init_ctx returns: non NULL upon success
e9a17296	77	* query returns: 0 - success, otherwise failure
3c0ef626	78	* respond returns: 0 - success, 1 - need further interaction,
	79	* otherwise - failure
	80	*/
	81	struct KbdintDevice
	82	{
	83	const char *name;
e9a17296	84	void* (init_ctx)(Authctxt);
	85	int (query)(void ctx, char name, char infotxt,
	86	u_int numprompts, char prompts, u_int echo_on);
	87	int (respond)(void ctx, u_int numresp, char **responses);
	88	void (free_ctx)(void ctx);
3c0ef626	89	};
3c0ef626	90
700318f3	91	int auth_rhosts(struct passwd , const char );
3c0ef626	92	int
	93	auth_rhosts2(struct passwd , const char , const char , const char );
	94
700318f3	95	int auth_rhosts_rsa(struct passwd , char , Key *);
3c0ef626	96	int auth_password(Authctxt , const char );
3c0ef626	97	int auth_rsa(struct passwd , BIGNUM );
700318f3	98	int auth_rsa_challenge_dialog(Key *);
	99	BIGNUM auth_rsa_generate_challenge(Key );
	100	int auth_rsa_verify_response(Key , BIGNUM , u_char[]);
	101	int auth_rsa_key_allowed(struct passwd , BIGNUM , Key **);
	102
	103	int auth_rhosts_rsa_key_allowed(struct passwd , char , char , Key );
	104	int hostbased_key_allowed(struct passwd , const char , char , Key );
	105	int user_key_allowed(struct passwd , Key );
3c0ef626	106
	107	#ifdef KRB4
	108	#include <krb.h>
	109	int auth_krb4(Authctxt , KTEXT, char *);
	110	int auth_krb4_password(Authctxt , const char );
	111	void krb4_cleanup_proc(void *);
	112
	113	#ifdef AFS
	114	#include <kafs.h>
	115	int auth_krb4_tgt(Authctxt , const char );
	116	int auth_afs_token(Authctxt , const char );
	117	#endif /* AFS */
	118
	119	#endif /* KRB4 */
	120
	121	#ifdef KRB5
	122	int auth_krb5(Authctxt authctxt, krb5_data auth, char **client);
	123	int auth_krb5_tgt(Authctxt authctxt, krb5_data tgt);
	124	int auth_krb5_password(Authctxt authctxt, const char password);
	125	void krb5_cleanup_proc(void *authctxt);
	126	#endif /* KRB5 */
	127
	128	#include "auth-pam.h"
	129	#include "auth2-pam.h"
	130
700318f3	131	Authctxt *do_authentication(void);
700318f3	132	Authctxt *do_authentication2(void);
3c0ef626	133
	134	Authctxt *authctxt_new(void);
	135	void auth_log(Authctxt , int, char , char *);
	136	void userauth_finish(Authctxt , int, char );
	137	int auth_root_allowed(char *);
	138
700318f3	139	char *auth2_read_banner(void);
	140
	141	void privsep_challenge_enable(void);
	142
3c0ef626	143	int auth2_challenge(Authctxt , char );
e9a17296	144	void auth2_challenge_stop(Authctxt *);
700318f3	145	int bsdauth_query(void , char , char , u_int , char *, u_int );
	146	int bsdauth_respond(void , u_int, char *);
	147	int skey_query(void , char , char , u_int , char *, u_int );
	148	int skey_respond(void , u_int, char *);
3c0ef626	149
3c0ef626	150	int allowed_user(struct passwd *);
700318f3	151	struct passwd * getpwnamallow(const char *user);
3c0ef626	152
	153	char get_challenge(Authctxt );
	154	int verify_response(Authctxt , const char );
	155
	156	struct passwd * auth_get_user(void);
	157
	158	char expand_filename(const char , struct passwd *);
	159	char authorized_keys_file(struct passwd );
	160	char authorized_keys_file2(struct passwd );
	161
	162	int
	163	secure_filename(FILE , const char , struct passwd , char , size_t);
	164
	165	HostStatus
	166	check_key_in_hostfiles(struct passwd , Key , const char *,
	167	const char , const char );
	168
700318f3	169	/* hostkey handling */
	170	Key *get_hostkey_by_index(int);
	171	Key *get_hostkey_by_type(int);
	172	int get_hostkey_index(Key *);
	173	int ssh1_session_key(BIGNUM *);
	174
	175	/* debug messages during authentication */
	176	void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
	177	void auth_debug_send(void);
	178	void auth_debug_reset(void);
	179
3c0ef626	180	#define AUTH_FAIL_MAX 6
	181	#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
	182	#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
	183
700318f3	184	#define SKEY_PROMPT "\nS/Key Password: "
3c0ef626	185	#endif