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/* @(#)auth.h	2.3 88/08/07 4.0 RPCSRC; from 1.17 88/02/08 SMI */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of the "Oracle America, Inc." nor the names of
 *       its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT
 * HOLDER OR CONTRIBUTORS 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.
 */

/*
 * auth.h, Authentication interface.
 *
 * The data structures are completely opaque to the client.  The client
 * is required to pass a AUTH * to routines that create rpc
 * "sessions".
 */
#ifndef GSSRPC_AUTH_H
#define GSSRPC_AUTH_H

#include <gssrpc/xdr.h>

GSSRPC__BEGIN_DECLS

#define MAX_AUTH_BYTES	400
#define MAXNETNAMELEN	255	/* maximum length of network user's name */

/*
 * Status returned from authentication check
 */
enum auth_stat {
	AUTH_OK=0,
	/*
	 * failed at remote end
	 */
	AUTH_BADCRED=1,			/* bogus credentials (seal broken) */
	AUTH_REJECTEDCRED=2,		/* client should begin new session */
	AUTH_BADVERF=3,			/* bogus verifier (seal broken) */
	AUTH_REJECTEDVERF=4,		/* verifier expired or was replayed */
	AUTH_TOOWEAK=5,			/* rejected due to security reasons */
	/*
	 * failed locally
	*/
	AUTH_INVALIDRESP=6,		/* bogus response verifier */
	AUTH_FAILED=7,			/* some unknown reason */
	/*
	 * RPCSEC_GSS errors
	 */
	RPCSEC_GSS_CREDPROBLEM = 13,
	RPCSEC_GSS_CTXPROBLEM = 14
};

union des_block {
	char c[8];
};
typedef union des_block des_block;
extern bool_t	xdr_des_block(XDR *, des_block *);

/*
 * Authentication info.  Opaque to client.
 */
struct opaque_auth {
	enum_t	oa_flavor;		/* flavor of auth */
	caddr_t	oa_base;		/* address of more auth stuff */
	u_int	oa_length;		/* not to exceed MAX_AUTH_BYTES */
};


/*
 * Auth handle, interface to client side authenticators.
 */
struct rpc_msg;

typedef struct AUTH {
	struct	opaque_auth	ah_cred;
	struct	opaque_auth	ah_verf;
	union	des_block	ah_key;
	struct auth_ops {
		void	(*ah_nextverf)(struct AUTH *);
	        /* nextverf & serialize */
		int	(*ah_marshal)(struct AUTH *, XDR *);
	        /* validate varifier */
		int	(*ah_validate)(struct AUTH *,
				       struct opaque_auth *);
	        /* refresh credentials */
		int	(*ah_refresh)(struct AUTH *, struct rpc_msg *);
	        /* destroy this structure */
		void	(*ah_destroy)(struct AUTH *);
		/* encode data for wire */
		int     (*ah_wrap)(struct AUTH *, XDR *,
				   xdrproc_t, caddr_t);
	        /* decode data from wire */
  	        int	(*ah_unwrap)(struct AUTH *, XDR *,
				     xdrproc_t, caddr_t);
	} *ah_ops;
	void *ah_private;
} AUTH;


/*
 * Authentication ops.
 * The ops and the auth handle provide the interface to the authenticators.
 *
 * AUTH	*auth;
 * XDR	*xdrs;
 * struct opaque_auth verf;
 */
#define AUTH_NEXTVERF(auth)		\
		((*((auth)->ah_ops->ah_nextverf))(auth))
#define auth_nextverf(auth)		\
		((*((auth)->ah_ops->ah_nextverf))(auth))

#define AUTH_MARSHALL(auth, xdrs)	\
		((*((auth)->ah_ops->ah_marshal))(auth, xdrs))
#define auth_marshall(auth, xdrs)	\
		((*((auth)->ah_ops->ah_marshal))(auth, xdrs))

#define AUTH_VALIDATE(auth, verfp)	\
		((*((auth)->ah_ops->ah_validate))((auth), verfp))
#define auth_validate(auth, verfp)	\
		((*((auth)->ah_ops->ah_validate))((auth), verfp))

#define AUTH_REFRESH(auth, msg)		\
		((*((auth)->ah_ops->ah_refresh))(auth, msg))
#define auth_refresh(auth, msg)		\
		((*((auth)->ah_ops->ah_refresh))(auth, msg))

#define AUTH_WRAP(auth, xdrs, xfunc, xwhere)		\
		((*((auth)->ah_ops->ah_wrap))(auth, xdrs, \
					      xfunc, xwhere))
#define auth_wrap(auth, xdrs, xfunc, xwhere)		\
		((*((auth)->ah_ops->ah_wrap))(auth, xdrs, \
					      xfunc, xwhere))
#define AUTH_UNWRAP(auth, xdrs, xfunc, xwhere)		\
		((*((auth)->ah_ops->ah_unwrap))(auth, xdrs, \
					      xfunc, xwhere))
#define auth_unwrap(auth, xdrs, xfunc, xwhere)		\
		((*((auth)->ah_ops->ah_unwrap))(auth, xdrs, \
					      xfunc, xwhere))

#define AUTH_DESTROY(auth)		\
		((*((auth)->ah_ops->ah_destroy))(auth))
#define auth_destroy(auth)		\
		((*((auth)->ah_ops->ah_destroy))(auth))


#ifdef GSSRPC__IMPL
/* RENAMED: should be _null_auth if we can use reserved namespace. */
extern struct opaque_auth gssrpc__null_auth;
#endif

/*
 * These are the various implementations of client side authenticators.
 */

/*
 * Unix style authentication
 * AUTH *authunix_create(machname, uid, gid, len, aup_gids)
 *	char *machname;
 *	int uid;
 *	int gid;
 *	int len;
 *	int *aup_gids;
 */
extern AUTH *authunix_create(char *machname, int uid, int gid, int len,
			     int *aup_gids);
extern AUTH *authunix_create_default(void);	/* takes no parameters */
extern AUTH *authnone_create(void);		/* takes no parameters */
extern AUTH *authdes_create();
extern bool_t xdr_opaque_auth(XDR *, struct opaque_auth *);

#define AUTH_NONE	0		/* no authentication */
#define	AUTH_NULL	0		/* backward compatibility */
#define	AUTH_UNIX	1		/* unix style (uid, gids) */
#define	AUTH_SHORT	2		/* short hand unix style */
#define AUTH_DES	3		/* des style (encrypted timestamps) */
#define AUTH_GSSAPI	300001		/* GSS-API style */
#define RPCSEC_GSS	6		/* RPCSEC_GSS */

GSSRPC__END_DECLS

#endif /* !defined(GSSRPC_AUTH_H) */
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