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