umap_subr.c revision 1.18
1 /* $NetBSD: umap_subr.c,v 1.18 2001/11/10 13:33:45 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1999 National Aeronautics & Space Administration 5 * All rights reserved. 6 * 7 * This software was written by William Studenmund of the 8 * Numerical Aerospace Simulation Facility, NASA Ames Research Center. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the National Aeronautics & Space Administration 19 * nor the names of its contributors may be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ADMINISTRATION OR CONTRIB- 27 * UTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 28 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Copyright (c) 1992, 1993, 1995 37 * The Regents of the University of California. All rights reserved. 38 * 39 * This code is derived from software donated to Berkeley by 40 * Jan-Simon Pendry. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * from: Id: lofs_subr.c, v 1.11 1992/05/30 10:05:43 jsp Exp 71 * @(#)umap_subr.c 8.9 (Berkeley) 5/14/95 72 */ 73 74 #include <sys/cdefs.h> 75 __KERNEL_RCSID(0, "$NetBSD: umap_subr.c,v 1.18 2001/11/10 13:33:45 lukem Exp $"); 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/time.h> 81 #include <sys/types.h> 82 #include <sys/vnode.h> 83 #include <sys/mount.h> 84 #include <sys/namei.h> 85 #include <sys/malloc.h> 86 #include <miscfs/specfs/specdev.h> 87 #include <miscfs/umapfs/umap.h> 88 89 u_long umap_findid __P((u_long, u_long [][2], int)); 90 int umap_node_alloc __P((struct mount *, struct vnode *, 91 struct vnode **)); 92 93 /* 94 * umap_findid is called by various routines in umap_vnodeops.c to 95 * find a user or group id in a map. 96 */ 97 u_long 98 umap_findid(id, map, nentries) 99 u_long id; 100 u_long map[][2]; 101 int nentries; 102 { 103 int i; 104 105 /* Find uid entry in map */ 106 i = 0; 107 while ((i<nentries) && ((map[i][0]) != id)) 108 i++; 109 110 if (i < nentries) 111 return (map[i][1]); 112 else 113 return (-1); 114 115 } 116 117 /* 118 * umap_reverse_findid is called by umap_getattr() in umap_vnodeops.c to 119 * find a user or group id in a map, in reverse. 120 */ 121 u_long 122 umap_reverse_findid(id, map, nentries) 123 u_long id; 124 u_long map[][2]; 125 int nentries; 126 { 127 int i; 128 129 /* Find uid entry in map */ 130 i = 0; 131 while ((i<nentries) && ((map[i][1]) != id)) 132 i++; 133 134 if (i < nentries) 135 return (map[i][0]); 136 else 137 return (-1); 138 139 } 140 141 /* umap_mapids maps all of the ids in a credential, both user and group. */ 142 143 void 144 umap_mapids(v_mount, credp) 145 struct mount *v_mount; 146 struct ucred *credp; 147 { 148 int i, unentries, gnentries; 149 uid_t uid; 150 gid_t gid; 151 u_long (*usermap)[2], (*groupmap)[2]; 152 153 if (credp == NOCRED) 154 return; 155 156 unentries = MOUNTTOUMAPMOUNT(v_mount)->info_nentries; 157 usermap = MOUNTTOUMAPMOUNT(v_mount)->info_mapdata; 158 gnentries = MOUNTTOUMAPMOUNT(v_mount)->info_gnentries; 159 groupmap = MOUNTTOUMAPMOUNT(v_mount)->info_gmapdata; 160 161 /* Find uid entry in map */ 162 163 uid = (uid_t) umap_findid(credp->cr_uid, usermap, unentries); 164 165 if (uid != -1) 166 credp->cr_uid = uid; 167 else 168 credp->cr_uid = (uid_t) NOBODY; 169 170 #if 1 171 /* cr_gid is the same as cr_groups[0] in 4BSD, but not in NetBSD */ 172 173 /* Find gid entry in map */ 174 175 gid = (gid_t) umap_findid(credp->cr_gid, groupmap, gnentries); 176 177 if (gid != -1) 178 credp->cr_gid = gid; 179 else 180 credp->cr_gid = NULLGROUP; 181 #endif 182 183 /* Now we must map each of the set of groups in the cr_groups 184 structure. */ 185 186 for(i=0; i < credp->cr_ngroups; i++) { 187 gid = (gid_t) umap_findid(credp->cr_groups[i], 188 groupmap, gnentries); 189 190 if (gid != -1) 191 credp->cr_groups[i] = gid; 192 else 193 credp->cr_groups[i] = NULLGROUP; 194 } 195 } 196
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