1 /* $NetBSD: creds.c,v 1.15 2009/11/20 14:23:54 pooka Exp $ */
4 * Copyright (c) 2006 Antti Kantee. All Rights Reserved.
6 * Development of this software was supported by the Ulla Tuominen Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
18 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Interface for dealing with credits.
34 #include <sys/types.h>
35 #include <sys/param.h>
42 #include "puffs_priv.h"
44 #define UUCCRED(a) (a->pkcr_type == PUFFCRED_TYPE_UUC)
45 #define INTCRED(a) (a->pkcr_type == PUFFCRED_TYPE_INTERNAL)
48 puffs_cred_getuid(const struct puffs_cred *pcr, uid_t *ruid)
50 PUFFS_MAKEKCRED(pkcr, pcr);
56 *ruid = pkcr->pkcr_uuc.cr_uid;
62 puffs_cred_getgid(const struct puffs_cred *pcr, gid_t *rgid)
64 PUFFS_MAKEKCRED(pkcr, pcr);
70 *rgid = pkcr->pkcr_uuc.cr_gid;
76 puffs_cred_getgroups(const struct puffs_cred *pcr, gid_t *rgids, short *ngids)
78 PUFFS_MAKEKCRED(pkcr, pcr);
87 ncopy = MIN(*ngids, pkcr->pkcr_uuc.cr_ngroups);
88 (void)memcpy(rgids, pkcr->pkcr_uuc.cr_groups, sizeof(gid_t) * ncopy);
89 *ngids = (short)ncopy;
95 puffs_cred_isuid(const struct puffs_cred *pcr, uid_t uid)
97 PUFFS_MAKEKCRED(pkcr, pcr);
99 return UUCCRED(pkcr) && pkcr->pkcr_uuc.cr_uid == uid;
103 puffs_cred_hasgroup(const struct puffs_cred *pcr, gid_t gid)
105 PUFFS_MAKEKCRED(pkcr, pcr);
111 if (pkcr->pkcr_uuc.cr_gid == gid)
113 for (i = 0; i < pkcr->pkcr_uuc.cr_ngroups; i++)
114 if (pkcr->pkcr_uuc.cr_groups[i] == gid)
121 puffs_cred_isregular(const struct puffs_cred *pcr)
123 PUFFS_MAKEKCRED(pkcr, pcr);
125 return UUCCRED(pkcr);
129 puffs_cred_iskernel(const struct puffs_cred *pcr)
131 PUFFS_MAKEKCRED(pkcr, pcr);
133 return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_NOCRED;
137 puffs_cred_isfs(const struct puffs_cred *pcr)
139 PUFFS_MAKEKCRED(pkcr, pcr);
141 return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_FSCRED;
145 puffs_cred_isjuggernaut(const struct puffs_cred *pcr)
148 return puffs_cred_isuid(pcr, 0) || puffs_cred_iskernel(pcr)
149 || puffs_cred_isfs(pcr);
153 * Generic routine for checking file access rights. Modeled after
154 * vaccess() in the kernel.
157 puffs_access(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
158 mode_t acc_mode, const struct puffs_cred *pcr)
163 if (puffs_cred_iskernel(pcr) || puffs_cred_isfs(pcr))
166 /* superuser, allow all except exec if *ALL* exec bits are unset */
167 if (puffs_cred_isuid(pcr, 0)) {
168 if ((acc_mode & PUFFS_VEXEC) && type != VDIR &&
169 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
176 if (puffs_cred_isuid(pcr, uid)) {
177 if (acc_mode & PUFFS_VEXEC)
179 if (acc_mode & PUFFS_VREAD)
181 if (acc_mode & PUFFS_VWRITE)
184 } else if (puffs_cred_hasgroup(pcr, gid)) {
185 if (acc_mode & PUFFS_VEXEC)
187 if (acc_mode & PUFFS_VREAD)
189 if (acc_mode & PUFFS_VWRITE)
193 if (acc_mode & PUFFS_VEXEC)
195 if (acc_mode & PUFFS_VREAD)
197 if (acc_mode & PUFFS_VWRITE)
201 if ((file_mode & mask) == mask)
208 puffs_access_chown(uid_t owner, gid_t group, uid_t newowner, gid_t newgroup,
209 const struct puffs_cred *pcr)
212 if (newowner == (uid_t)PUFFS_VNOVAL)
214 if (newgroup == (gid_t)PUFFS_VNOVAL)
217 if ((!puffs_cred_isuid(pcr, owner) || newowner != owner ||
218 ((newgroup != group && !puffs_cred_hasgroup(pcr, newgroup))))
219 && !puffs_cred_isjuggernaut(pcr))
226 puffs_access_chmod(uid_t owner, gid_t group, enum vtype type, mode_t mode,
227 const struct puffs_cred *pcr)
230 if (!puffs_cred_isuid(pcr, owner) && !puffs_cred_isjuggernaut(pcr))
233 if (!puffs_cred_isjuggernaut(pcr)) {
234 if (type != VDIR && (mode & S_ISTXT))
236 if (!puffs_cred_hasgroup(pcr, group) && (mode & S_ISGID))
244 puffs_access_times(uid_t uid, gid_t gid, mode_t mode, int va_utimes_null,
245 const struct puffs_cred *pcr)
248 if (!puffs_cred_isuid(pcr, uid) && !puffs_cred_isjuggernaut(pcr)
249 && (va_utimes_null == 0
250 || puffs_access(VNON, mode, uid, gid, PUFFS_VWRITE, pcr) != 0))