1 /* $NetBSD: umap_subr.c,v 1.23 2005/12/11 12:24:51 christos 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. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * from: Id: lofs_subr.c, v 1.11 1992/05/30 10:05:43 jsp Exp 67 * @(#)umap_subr.c 8.9 (Berkeley) 5/14/95 68 */ 69 70 #include <sys/cdefs.h> 71 __KERNEL_RCSID(0, "$NetBSD: umap_subr.c,v 1.23 2005/12/11 12:24:51 christos Exp $"); 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/proc.h> 76 #include <sys/time.h> 77 #include <sys/vnode.h> 78 #include <sys/mount.h> 79 #include <sys/namei.h> 80 #include <sys/malloc.h> 81 #include <miscfs/specfs/specdev.h> 82 #include <miscfs/umapfs/umap.h> 83 84 u_long umap_findid(u_long, u_long [][2], int); 85 int umap_node_alloc(struct mount *, struct vnode *, 86 struct vnode **); 87 88 /* 89 * umap_findid is called by various routines in umap_vnodeops.c to 90 * find a user or group id in a map. 91 */ 92 u_long 93 umap_findid(id, map, nentries) 94 u_long id; 95 u_long map[][2]; 96 int nentries; 97 { 98 int i; 99 100 /* Find uid entry in map */ 101 i = 0; 102 while ((i<nentries) && ((map[i][0]) != id)) 103 i++; 104 105 if (i < nentries) 106 return (map[i][1]); 107 else 108 return (-1); 109 110 } 111 112 /* 113 * umap_reverse_findid is called by umap_getattr() in umap_vnodeops.c to 114 * find a user or group id in a map, in reverse. 115 */ 116 u_long 117 umap_reverse_findid(id, map, nentries) 118 u_long id; 119 u_long map[][2]; 120 int nentries; 121 { 122 int i; 123 124 /* Find uid entry in map */ 125 i = 0; 126 while ((i<nentries) && ((map[i][1]) != id)) 127 i++; 128 129 if (i < nentries) 130 return (map[i][0]); 131 else 132 return (-1); 133 134 } 135 136 /* umap_mapids maps all of the ids in a credential, both user and group. */ 137 138 void 139 umap_mapids(v_mount, credp) 140 struct mount *v_mount; 141 struct ucred *credp; 142 { 143 int i, unentries, gnentries; 144 uid_t uid; 145 gid_t gid; 146 u_long (*usermap)[2], (*groupmap)[2]; 147 148 if (credp == NOCRED) 149 return; 150 151 unentries = MOUNTTOUMAPMOUNT(v_mount)->info_nentries; 152 usermap = MOUNTTOUMAPMOUNT(v_mount)->info_mapdata; 153 gnentries = MOUNTTOUMAPMOUNT(v_mount)->info_gnentries; 154 groupmap = MOUNTTOUMAPMOUNT(v_mount)->info_gmapdata; 155 156 /* Find uid entry in map */ 157 158 uid = (uid_t) umap_findid(credp->cr_uid, usermap, unentries); 159 160 if (uid != -1) 161 credp->cr_uid = uid; 162 else 163 credp->cr_uid = (uid_t) NOBODY; 164 165 #if 1 166 /* cr_gid is the same as cr_groups[0] in 4BSD, but not in NetBSD */ 167 168 /* Find gid entry in map */ 169 170 gid = (gid_t) umap_findid(credp->cr_gid, groupmap, gnentries); 171 172 if (gid != -1) 173 credp->cr_gid = gid; 174 else 175 credp->cr_gid = NULLGROUP; 176 #endif 177 178 /* Now we must map each of the set of groups in the cr_groups 179 structure. */ 180 181 for(i=0; i < credp->cr_ngroups; i++) { 182 gid = (gid_t) umap_findid(credp->cr_groups[i], 183 groupmap, gnentries); 184 185 if (gid != -1) 186 credp->cr_groups[i] = gid; 187 else 188 credp->cr_groups[i] = NULLGROUP; 189 } 190 } 191