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/usr/include/rpcsecgss/rpc/auth_gss.h is in librpcsecgss-dev 0.19-7.

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/*
  auth_gss.h

  Copyright (c) 2000 The Regents of the University of Michigan.
  All rights reserved.

  Copyright (c) 2000 Dug Song <dugsong@UMICH.EDU>.
  All rights reserved, all wrongs reversed.

  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.
  3. Neither the name of the University 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 ``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 REGENTS 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.

*/

#ifndef _RPC_AUTH_GSS_H
#define _RPC_AUTH_GSS_H

#include <rpc/clnt.h>
#include <gssapi/gssapi.h>

/* RPCSEC_GSS control procedures. */
typedef enum {
	RPCSEC_GSS_DATA = 0,
	RPCSEC_GSS_INIT = 1,
	RPCSEC_GSS_CONTINUE_INIT = 2,
	RPCSEC_GSS_DESTROY = 3
} rpc_gss_proc_t;

/* RPCSEC_GSS services. */
typedef enum {
	RPCSEC_GSS_SVC_NONE = 1,
	RPCSEC_GSS_SVC_INTEGRITY = 2,
	RPCSEC_GSS_SVC_PRIVACY = 3
} rpc_gss_svc_t;

#define RPCSEC_GSS_VERSION	1

/* RPCSEC_GSS security triple. */
struct rpc_gss_sec {
	gss_OID		mech;		/* mechanism */
	gss_qop_t	qop;		/* quality of protection */
	rpc_gss_svc_t	svc;		/* service */
	gss_cred_id_t	cred;		/* cred handle */
	u_int		req_flags;	/* req flags for init_sec_context */
};

/* Private data required for kernel implementation */
struct authgss_private_data {
	gss_ctx_id_t	pd_ctx;		/* Session context handle */
	gss_buffer_desc	pd_ctx_hndl;	/* Credentials context handle */
	u_int		pd_seq_win;	/* Sequence window */
};

/* Credentials. */
struct rpc_gss_cred {
	u_int		gc_v;		/* version */
	rpc_gss_proc_t	gc_proc;	/* control procedure */
	u_int		gc_seq;		/* sequence number */
	rpc_gss_svc_t	gc_svc;		/* service */
	gss_buffer_desc	gc_ctx;		/* context handle */
};

/* Context creation response. */
struct rpc_gss_init_res {
	gss_buffer_desc		gr_ctx;		/* context handle */
	u_int			gr_major;	/* major status */
	u_int			gr_minor;	/* minor status */
	u_int			gr_win;		/* sequence window */
	gss_buffer_desc		gr_token;	/* token */
};

/* Maximum sequence number value. */
#define MAXSEQ		0x80000000

/* Prototypes. */
__BEGIN_DECLS
bool_t	xdr_rpc_gss_cred	__P((XDR *xdrs, struct rpc_gss_cred *p));
bool_t	xdr_rpc_gss_init_args	__P((XDR *xdrs, gss_buffer_desc *p));
bool_t	xdr_rpc_gss_init_res	__P((XDR *xdrs, struct rpc_gss_init_res *p));
bool_t	xdr_rpc_gss_data	__P((XDR *xdrs, xdrproc_t xdr_func,
				     caddr_t xdr_ptr, gss_ctx_id_t ctx,
				     gss_qop_t qop, rpc_gss_svc_t svc,
				     u_int seq));

AUTH   *authgss_create		__P((CLIENT *, gss_name_t,
				     struct rpc_gss_sec *));
AUTH   *authgss_create_default	__P((CLIENT *, char *, struct rpc_gss_sec *));
bool_t authgss_service		__P((AUTH *auth, int svc));
bool_t authgss_get_private_data	__P((AUTH *auth,
				     struct authgss_private_data *));
bool_t authgss_free_private_data __P((struct authgss_private_data *pd));



int     authgss_set_debug_level __P((int new_level));
void	authgss_log_err		__P((char *format, ...));
void	authgss_log_dbg		__P((char *format, ...));
void	authgss_log_status	__P((char *m, OM_uint32 maj_stat,
				     OM_uint32 min_stat));
void	authgss_perror		__P((int err, char *msg));
void	authgss_log_hexdump	__P((const u_char *buf, int len, int offset));

__END_DECLS

/* Debugging */
extern int authgss_debug_level;

#define BEGINMAC do {
#define ENDMAC   } while (0)

#define AUTHGSS_DEBUG(lvl, msg) \
	BEGINMAC \
	if ((lvl) <= authgss_debug_level) \
		authgss_log_dbg msg; \
	ENDMAC

#endif /* !_RPC_AUTH_GSS_H */