The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/ucred.h

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    1 /*
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)ucred.h     8.4 (Berkeley) 1/9/95
   34  * $FreeBSD: releng/5.0/sys/sys/ucred.h 102538 2002-08-28 20:39:48Z alfred $
   35  */
   36 
   37 #ifndef _SYS_UCRED_H_
   38 #define _SYS_UCRED_H_
   39 
   40 /*
   41  * Credentials.
   42  *
   43  * Please do not inspect cr_uid directly to determine superuserness.
   44  * Only the suser() or suser_cred() function should be used for this.
   45  */
   46 #if defined(_KERNEL) || defined(_WANT_UCRED)
   47 #include <sys/_label.h>
   48 
   49 struct ucred {
   50         u_int   cr_ref;                 /* reference count */
   51 #define cr_startcopy cr_uid
   52         uid_t   cr_uid;                 /* effective user id */
   53         uid_t   cr_ruid;                /* real user id */
   54         uid_t   cr_svuid;               /* saved user id */
   55         short   cr_ngroups;             /* number of groups */
   56         gid_t   cr_groups[NGROUPS];     /* groups */
   57         gid_t   cr_rgid;                /* real group id */
   58         gid_t   cr_svgid;               /* saved user id */
   59         struct uidinfo  *cr_uidinfo;    /* per euid resource consumption */
   60         struct uidinfo  *cr_ruidinfo;   /* per ruid resource consumption */
   61         struct prison   *cr_prison;     /* jail(4) */
   62 #define cr_endcopy      cr_label
   63         struct label    cr_label;       /* MAC label */
   64         struct mtx      *cr_mtxp;       /* protect refcount */
   65 };
   66 #define NOCRED  ((struct ucred *)0)     /* no credential available */
   67 #define FSCRED  ((struct ucred *)-1)    /* filesystem credential */
   68 #endif /* _KERNEL || _WANT_UCRED */
   69 
   70 /*
   71  * This is the external representation of struct ucred.
   72  */
   73 struct xucred {
   74         u_int   cr_version;             /* structure layout version */
   75         uid_t   cr_uid;                 /* effective user id */
   76         short   cr_ngroups;             /* number of groups */
   77         gid_t   cr_groups[NGROUPS];     /* groups */
   78         void    *_cr_unused1;           /* compatibility with old ucred */
   79 };
   80 #define XUCRED_VERSION  0
   81 
   82 /* This can be used for both ucred and xucred structures. */
   83 #define cr_gid cr_groups[0]
   84 
   85 #ifdef _KERNEL
   86 struct thread;
   87 
   88 #ifdef DIAGNOSTIC
   89 void    cred_free_thread(struct thread *td);
   90 #endif
   91 void    change_egid(struct ucred *newcred, gid_t egid);
   92 void    change_euid(struct ucred *newcred, struct uidinfo *euip);
   93 void    change_rgid(struct ucred *newcred, gid_t rgid);
   94 void    change_ruid(struct ucred *newcred, struct uidinfo *ruip);
   95 void    change_svgid(struct ucred *newcred, gid_t svgid);
   96 void    change_svuid(struct ucred *newcred, uid_t svuid);
   97 void    crcopy(struct ucred *dest, struct ucred *src);
   98 struct ucred    *crdup(struct ucred *cr);
   99 void    cred_update_thread(struct thread *td);
  100 void    crfree(struct ucred *cr);
  101 struct ucred    *crget(void);
  102 struct ucred    *crhold(struct ucred *cr);
  103 int     crshared(struct ucred *cr);
  104 void    cru2x(struct ucred *cr, struct xucred *xcr);
  105 int     groupmember(gid_t gid, struct ucred *cred);
  106 #endif /* _KERNEL */
  107 
  108 #endif /* !_SYS_UCRED_H_ */

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