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Mark all the rpc 'ops' vectors, for auth, client, service, and xdr,
as const, moving them from .data to .data.rel.ro.  The other BSDs
did this a long time ago; NetBSD did a chunk in 1998, which is long
enough I didn't bother to get exact dates for others.

ok deraadt@ millert@

/*	$OpenBSD: auth.h,v 1.9 2022/02/14 03:38:59 guenther Exp $	*/
/*	$NetBSD: auth.h,v 1.7 1995/04/29 05:27:55 cgd Exp $	*/

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * 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.
 *
 *	from: @(#)auth.h 1.17 88/02/08 SMI
 *	@(#)auth.h	2.3 88/08/07 4.0 RPCSRC
 */

/*
 * 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 _RPC_AUTH_H
#define _RPC_AUTH_H
#include <sys/cdefs.h>

#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 */
};

typedef u_int32_t u_int32;	/* 32-bit unsigned integers */

union des_block {
	struct {
		u_int32 high;
		u_int32 low;
	} key;
	char c[8];
};
typedef union des_block des_block;
__BEGIN_DECLS
extern bool_t xdr_des_block(XDR *, des_block *);
__END_DECLS

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


/*
 * Auth handle, interface to client side authenticators.
 */
typedef struct __rpc_auth {
	struct	opaque_auth	ah_cred;
	struct	opaque_auth	ah_verf;
	union	des_block	ah_key;
	const struct auth_ops {
		void	(*ah_nextverf)(struct __rpc_auth *);
		/* nextverf & serialize */
		int	(*ah_marshal)(struct __rpc_auth *, XDR *);
		/* validate varifier */
		int	(*ah_validate)(struct __rpc_auth *,
			    struct opaque_auth *);
		/* refresh credentials */
		int	(*ah_refresh)(struct __rpc_auth *);
		/* destroy this structure */
		void	(*ah_destroy)(struct __rpc_auth *);
	} *ah_ops;
	caddr_t 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)		\
		((*((auth)->ah_ops->ah_refresh))(auth))
#define auth_refresh(auth)		\
		((*((auth)->ah_ops->ah_refresh))(auth))

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


extern struct opaque_auth _null_auth;


/*
 * 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;
 */
__BEGIN_DECLS
struct sockaddr_in;
extern AUTH *authunix_create(char *, int, int, int, int *);
extern AUTH *authunix_create_default(void);
extern AUTH *authnone_create(void);
extern void set_rpc_maxgrouplist(int);
__END_DECLS

#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) */

#endif /* !_RPC_AUTH_H */