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 /*      $NetBSD: ucred.h,v 1.21 2005/02/26 22:25:34 perry Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ucred.h     8.4 (Berkeley) 1/9/95
   32  */
   33 
   34 #ifndef _SYS_UCRED_H_
   35 #define _SYS_UCRED_H_
   36 
   37 #include <sys/lock.h>
   38 
   39 /*
   40  * Credentials.
   41  */
   42 
   43 /* Userland's view of credentials. This should not change */
   44 struct uucred {
   45         u_short         cr_unused;              /* not used, compat */
   46         uid_t           cr_uid;                 /* effective user id */
   47         gid_t           cr_gid;                 /* effective group id */
   48         short           cr_ngroups;             /* number of groups */
   49         gid_t           cr_groups[NGROUPS];     /* groups */
   50 };
   51 
   52 struct ucred {
   53         struct simplelock cr_lock;              /* mutex for ref count */
   54         u_int32_t       cr_ref;                 /* reference count */
   55 #define cr_startcopy    cr_uid                  /* for dup & copy */
   56         uid_t           cr_uid;                 /* effective user id */
   57         gid_t           cr_gid;                 /* effective group id */
   58         u_int32_t       cr_ngroups;             /* number of groups */
   59         gid_t           cr_groups[NGROUPS];     /* groups */
   60 };
   61 
   62 #define NOCRED ((struct ucred *)-1)     /* no credential available */
   63 #define FSCRED ((struct ucred *)-2)     /* filesystem credential */
   64 
   65 #ifdef _KERNEL
   66 static __inline__ void crhold(struct ucred *cr)
   67 {
   68         simple_lock(&cr->cr_lock);
   69         cr->cr_ref++;
   70         simple_unlock(&cr->cr_lock);
   71 }
   72 
   73 /* flags that control when do_setres{u,g}id will do anything */
   74 #define ID_E_EQ_E       0x001           /* effective equals effective */
   75 #define ID_E_EQ_R       0x002           /* effective equals real */
   76 #define ID_E_EQ_S       0x004           /* effective equals saved */
   77 #define ID_R_EQ_E       0x010           /* real equals effective */
   78 #define ID_R_EQ_R       0x020           /* real equals real */
   79 #define ID_R_EQ_S       0x040           /* real equals saved */
   80 #define ID_S_EQ_E       0x100           /* saved equals effective */
   81 #define ID_S_EQ_R       0x200           /* saved equals real */
   82 #define ID_S_EQ_S       0x400           /* saved equals saved */
   83 
   84 int             do_setresuid(struct lwp *, uid_t, uid_t, uid_t, u_int);
   85 int             do_setresgid(struct lwp *, gid_t, gid_t, gid_t, u_int);
   86 
   87 struct ucred    *crcopy(struct ucred *);
   88 struct ucred    *crdup(const struct ucred *);
   89 void            crfree(struct ucred *);
   90 struct ucred    *crget(void);
   91 int             suser(const struct ucred *, u_short *);
   92 void            crcvt(struct ucred *, const struct uucred *);
   93 int             crcmp(const struct ucred *, const struct uucred *);
   94 #endif /* _KERNEL */
   95 
   96 #endif /* !_SYS_UCRED_H_ */

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