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ucred.h

/*-
 * Copyright (c) 1989, 1993
 *    The Regents of the University of California.  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.
 * 4. 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 BY THE REGENTS 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 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.
 *
 *    @(#)ucred.h 8.4 (Berkeley) 1/9/95
 * $FreeBSD: src/sys/sys/ucred.h,v 1.55.2.1 2007/12/07 05:46:09 kmacy Exp $
 */

#ifndef _SYS_UCRED_H_
#define     _SYS_UCRED_H_

#include <bsm/audit.h>

/*
 * Credentials.
 *
 * Please do not inspect cr_uid directly to determine superuserness.  The
 * priv(9) interface should be used to check for privilege.
 */
#if defined(_KERNEL) || defined(_WANT_UCRED)
struct ucred {
      u_int cr_ref;                 /* reference count */
#define     cr_startcopy cr_uid
      uid_t cr_uid;                 /* effective user id */
      uid_t cr_ruid;          /* real user id */
      uid_t cr_svuid;         /* saved user id */
      short cr_ngroups;       /* number of groups */
      gid_t cr_groups[NGROUPS];     /* groups */
      gid_t cr_rgid;          /* real group id */
      gid_t cr_svgid;         /* saved group id */
      struct uidinfo    *cr_uidinfo;      /* per euid resource consumption */
      struct uidinfo    *cr_ruidinfo;     /* per ruid resource consumption */
      struct prison     *cr_prison; /* jail(2) */
      void        *cr_pspare[3];    /* vimage 2; general use 1 */
#define     cr_endcopy  cr_label
      struct label      *cr_label;  /* MAC label */
      struct auditinfo_addr   cr_audit;   /* Audit properties. */
};
#define     NOCRED      ((struct ucred *)0)     /* no credential available */
#define     FSCRED      ((struct ucred *)-1)    /* filesystem credential */
#endif /* _KERNEL || _WANT_UCRED */

/*
 * This is the external representation of struct ucred.
 */
struct xucred {
      u_int cr_version;       /* structure layout version */
      uid_t cr_uid;                 /* effective user id */
      short cr_ngroups;       /* number of groups */
      gid_t cr_groups[NGROUPS];     /* groups */
      void  *_cr_unused1;           /* compatibility with old ucred */
};
#define     XUCRED_VERSION    0

/* This can be used for both ucred and xucred structures. */
#define     cr_gid cr_groups[0]

#ifdef _KERNEL
struct thread;

void  change_egid(struct ucred *newcred, gid_t egid);
void  change_euid(struct ucred *newcred, struct uidinfo *euip);
void  change_rgid(struct ucred *newcred, gid_t rgid);
void  change_ruid(struct ucred *newcred, struct uidinfo *ruip);
void  change_svgid(struct ucred *newcred, gid_t svgid);
void  change_svuid(struct ucred *newcred, uid_t svuid);
void  crcopy(struct ucred *dest, struct ucred *src);
struct ucred      *crdup(struct ucred *cr);
void  cred_update_thread(struct thread *td);
void  crfree(struct ucred *cr);
struct ucred      *crget(void);
struct ucred      *crhold(struct ucred *cr);
int   crshared(struct ucred *cr);
void  cru2x(struct ucred *cr, struct xucred *xcr);
int   groupmember(gid_t gid, struct ucred *cred);
#endif /* _KERNEL */

#endif /* !_SYS_UCRED_H_ */

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