1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 33a8a9a10SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7e9fc2aa0SSteven Whitehouse * of the GNU General Public License version 2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #include <linux/sched.h> 11b3b94faaSDavid Teigland #include <linux/slab.h> 12b3b94faaSDavid Teigland #include <linux/spinlock.h> 13b3b94faaSDavid Teigland #include <linux/completion.h> 14b3b94faaSDavid Teigland #include <linux/buffer_head.h> 15b3b94faaSDavid Teigland #include <linux/posix_acl.h> 16b3b94faaSDavid Teigland #include <linux/posix_acl_xattr.h> 175c676f6dSSteven Whitehouse #include <linux/gfs2_ondisk.h> 18b3b94faaSDavid Teigland 19b3b94faaSDavid Teigland #include "gfs2.h" 205c676f6dSSteven Whitehouse #include "incore.h" 21b3b94faaSDavid Teigland #include "acl.h" 22b3b94faaSDavid Teigland #include "eaops.h" 23b3b94faaSDavid Teigland #include "eattr.h" 24b3b94faaSDavid Teigland #include "glock.h" 25b3b94faaSDavid Teigland #include "inode.h" 26b3b94faaSDavid Teigland #include "meta_io.h" 27b3b94faaSDavid Teigland #include "trans.h" 285c676f6dSSteven Whitehouse #include "util.h" 29b3b94faaSDavid Teigland 30b3b94faaSDavid Teigland #define ACL_ACCESS 1 31b3b94faaSDavid Teigland #define ACL_DEFAULT 0 32b3b94faaSDavid Teigland 33b3b94faaSDavid Teigland int gfs2_acl_validate_set(struct gfs2_inode *ip, int access, 34b3b94faaSDavid Teigland struct gfs2_ea_request *er, 35b3b94faaSDavid Teigland int *remove, mode_t *mode) 36b3b94faaSDavid Teigland { 37b3b94faaSDavid Teigland struct posix_acl *acl; 38b3b94faaSDavid Teigland int error; 39b3b94faaSDavid Teigland 40b3b94faaSDavid Teigland error = gfs2_acl_validate_remove(ip, access); 41b3b94faaSDavid Teigland if (error) 42b3b94faaSDavid Teigland return error; 43b3b94faaSDavid Teigland 44b3b94faaSDavid Teigland if (!er->er_data) 45b3b94faaSDavid Teigland return -EINVAL; 46b3b94faaSDavid Teigland 47b3b94faaSDavid Teigland acl = posix_acl_from_xattr(er->er_data, er->er_data_len); 48b3b94faaSDavid Teigland if (IS_ERR(acl)) 49b3b94faaSDavid Teigland return PTR_ERR(acl); 50b3b94faaSDavid Teigland if (!acl) { 51b3b94faaSDavid Teigland *remove = 1; 52b3b94faaSDavid Teigland return 0; 53b3b94faaSDavid Teigland } 54b3b94faaSDavid Teigland 55b3b94faaSDavid Teigland error = posix_acl_valid(acl); 56b3b94faaSDavid Teigland if (error) 57b3b94faaSDavid Teigland goto out; 58b3b94faaSDavid Teigland 59b3b94faaSDavid Teigland if (access) { 60b3b94faaSDavid Teigland error = posix_acl_equiv_mode(acl, mode); 61b3b94faaSDavid Teigland if (!error) 62b3b94faaSDavid Teigland *remove = 1; 63b3b94faaSDavid Teigland else if (error > 0) 64b3b94faaSDavid Teigland error = 0; 65b3b94faaSDavid Teigland } 66b3b94faaSDavid Teigland 67b3b94faaSDavid Teigland out: 68b3b94faaSDavid Teigland posix_acl_release(acl); 69b3b94faaSDavid Teigland return error; 70b3b94faaSDavid Teigland } 71b3b94faaSDavid Teigland 72b3b94faaSDavid Teigland int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access) 73b3b94faaSDavid Teigland { 74feaa7bbaSSteven Whitehouse if (!GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl) 75b3b94faaSDavid Teigland return -EOPNOTSUPP; 763bd858abSSatyam Sharma if (!is_owner_or_cap(&ip->i_inode)) 77b3b94faaSDavid Teigland return -EPERM; 78b60623c2SSteven Whitehouse if (S_ISLNK(ip->i_inode.i_mode)) 79b3b94faaSDavid Teigland return -EOPNOTSUPP; 80b60623c2SSteven Whitehouse if (!access && !S_ISDIR(ip->i_inode.i_mode)) 81b3b94faaSDavid Teigland return -EACCES; 82b3b94faaSDavid Teigland 83b3b94faaSDavid Teigland return 0; 84b3b94faaSDavid Teigland } 85b3b94faaSDavid Teigland 86b3b94faaSDavid Teigland static int acl_get(struct gfs2_inode *ip, int access, struct posix_acl **acl, 87b3b94faaSDavid Teigland struct gfs2_ea_location *el, char **data, unsigned int *len) 88b3b94faaSDavid Teigland { 89b3b94faaSDavid Teigland struct gfs2_ea_request er; 90b3b94faaSDavid Teigland struct gfs2_ea_location el_this; 91b3b94faaSDavid Teigland int error; 92b3b94faaSDavid Teigland 933767ac21SSteven Whitehouse if (!ip->i_eattr) 94b3b94faaSDavid Teigland return 0; 95b3b94faaSDavid Teigland 96b3b94faaSDavid Teigland memset(&er, 0, sizeof(struct gfs2_ea_request)); 97b3b94faaSDavid Teigland if (access) { 98b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_ACCESS; 99b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN; 100b3b94faaSDavid Teigland } else { 101b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_DEFAULT; 102b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN; 103b3b94faaSDavid Teigland } 104b3b94faaSDavid Teigland er.er_type = GFS2_EATYPE_SYS; 105b3b94faaSDavid Teigland 106b3b94faaSDavid Teigland if (!el) 107b3b94faaSDavid Teigland el = &el_this; 108b3b94faaSDavid Teigland 109b3b94faaSDavid Teigland error = gfs2_ea_find(ip, &er, el); 110b3b94faaSDavid Teigland if (error) 111b3b94faaSDavid Teigland return error; 112b3b94faaSDavid Teigland if (!el->el_ea) 113b3b94faaSDavid Teigland return 0; 114b3b94faaSDavid Teigland if (!GFS2_EA_DATA_LEN(el->el_ea)) 115b3b94faaSDavid Teigland goto out; 116b3b94faaSDavid Teigland 117b3b94faaSDavid Teigland er.er_data_len = GFS2_EA_DATA_LEN(el->el_ea); 11816c5f06fSJosef Bacik er.er_data = kmalloc(er.er_data_len, GFP_NOFS); 119b3b94faaSDavid Teigland error = -ENOMEM; 120b3b94faaSDavid Teigland if (!er.er_data) 121b3b94faaSDavid Teigland goto out; 122b3b94faaSDavid Teigland 123b3b94faaSDavid Teigland error = gfs2_ea_get_copy(ip, el, er.er_data); 124b3b94faaSDavid Teigland if (error) 125b3b94faaSDavid Teigland goto out_kfree; 126b3b94faaSDavid Teigland 127b3b94faaSDavid Teigland if (acl) { 128b3b94faaSDavid Teigland *acl = posix_acl_from_xattr(er.er_data, er.er_data_len); 129b3b94faaSDavid Teigland if (IS_ERR(*acl)) 130b3b94faaSDavid Teigland error = PTR_ERR(*acl); 131b3b94faaSDavid Teigland } 132b3b94faaSDavid Teigland 133b3b94faaSDavid Teigland out_kfree: 134b3b94faaSDavid Teigland if (error || !data) 135b3b94faaSDavid Teigland kfree(er.er_data); 136b3b94faaSDavid Teigland else { 137b3b94faaSDavid Teigland *data = er.er_data; 138b3b94faaSDavid Teigland *len = er.er_data_len; 139b3b94faaSDavid Teigland } 140b3b94faaSDavid Teigland out: 141b3b94faaSDavid Teigland if (error || el == &el_this) 142b3b94faaSDavid Teigland brelse(el->el_bh); 143b3b94faaSDavid Teigland return error; 144b3b94faaSDavid Teigland } 145b3b94faaSDavid Teigland 146b3b94faaSDavid Teigland /** 14777386e1fSSteven Whitehouse * gfs2_check_acl - Check an ACL to see if we're allowed to do something 148b3b94faaSDavid Teigland * @inode: the file we want to do something to 149b3b94faaSDavid Teigland * @mask: what we want to do 150b3b94faaSDavid Teigland * 151b3b94faaSDavid Teigland * Returns: errno 152b3b94faaSDavid Teigland */ 153b3b94faaSDavid Teigland 15477386e1fSSteven Whitehouse int gfs2_check_acl(struct inode *inode, int mask) 155b3b94faaSDavid Teigland { 156b3b94faaSDavid Teigland struct posix_acl *acl = NULL; 157b3b94faaSDavid Teigland int error; 158b3b94faaSDavid Teigland 159feaa7bbaSSteven Whitehouse error = acl_get(GFS2_I(inode), ACL_ACCESS, &acl, NULL, NULL, NULL); 160b3b94faaSDavid Teigland if (error) 161b3b94faaSDavid Teigland return error; 162b3b94faaSDavid Teigland 163b3b94faaSDavid Teigland if (acl) { 164b3b94faaSDavid Teigland error = posix_acl_permission(inode, acl, mask); 165b3b94faaSDavid Teigland posix_acl_release(acl); 166b3b94faaSDavid Teigland return error; 167b3b94faaSDavid Teigland } 168b3b94faaSDavid Teigland 169b3b94faaSDavid Teigland return -EAGAIN; 170b3b94faaSDavid Teigland } 171b3b94faaSDavid Teigland 172b3b94faaSDavid Teigland static int munge_mode(struct gfs2_inode *ip, mode_t mode) 173b3b94faaSDavid Teigland { 174feaa7bbaSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 175b3b94faaSDavid Teigland struct buffer_head *dibh; 176b3b94faaSDavid Teigland int error; 177b3b94faaSDavid Teigland 178b3b94faaSDavid Teigland error = gfs2_trans_begin(sdp, RES_DINODE, 0); 179b3b94faaSDavid Teigland if (error) 180b3b94faaSDavid Teigland return error; 181b3b94faaSDavid Teigland 182b3b94faaSDavid Teigland error = gfs2_meta_inode_buffer(ip, &dibh); 183b3b94faaSDavid Teigland if (!error) { 184b3b94faaSDavid Teigland gfs2_assert_withdraw(sdp, 185b60623c2SSteven Whitehouse (ip->i_inode.i_mode & S_IFMT) == (mode & S_IFMT)); 186b60623c2SSteven Whitehouse ip->i_inode.i_mode = mode; 187d4e9c4c3SSteven Whitehouse gfs2_trans_add_bh(ip->i_gl, dibh, 1); 188539e5d6bSSteven Whitehouse gfs2_dinode_out(ip, dibh->b_data); 189b3b94faaSDavid Teigland brelse(dibh); 190b3b94faaSDavid Teigland } 191b3b94faaSDavid Teigland 192b3b94faaSDavid Teigland gfs2_trans_end(sdp); 193b3b94faaSDavid Teigland 194b3b94faaSDavid Teigland return 0; 195b3b94faaSDavid Teigland } 196b3b94faaSDavid Teigland 197b3b94faaSDavid Teigland int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip) 198b3b94faaSDavid Teigland { 199feaa7bbaSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 200b3b94faaSDavid Teigland struct posix_acl *acl = NULL, *clone; 201b3b94faaSDavid Teigland struct gfs2_ea_request er; 202b60623c2SSteven Whitehouse mode_t mode = ip->i_inode.i_mode; 203b3b94faaSDavid Teigland int error; 204b3b94faaSDavid Teigland 205b3b94faaSDavid Teigland if (!sdp->sd_args.ar_posix_acl) 206b3b94faaSDavid Teigland return 0; 207b60623c2SSteven Whitehouse if (S_ISLNK(ip->i_inode.i_mode)) 208b3b94faaSDavid Teigland return 0; 209b3b94faaSDavid Teigland 210b3b94faaSDavid Teigland memset(&er, 0, sizeof(struct gfs2_ea_request)); 211b3b94faaSDavid Teigland er.er_type = GFS2_EATYPE_SYS; 212b3b94faaSDavid Teigland 213b3b94faaSDavid Teigland error = acl_get(dip, ACL_DEFAULT, &acl, NULL, 214b3b94faaSDavid Teigland &er.er_data, &er.er_data_len); 215b3b94faaSDavid Teigland if (error) 216b3b94faaSDavid Teigland return error; 217b3b94faaSDavid Teigland if (!acl) { 218ce3b0f8dSAl Viro mode &= ~current_umask(); 219b60623c2SSteven Whitehouse if (mode != ip->i_inode.i_mode) 220b3b94faaSDavid Teigland error = munge_mode(ip, mode); 221b3b94faaSDavid Teigland return error; 222b3b94faaSDavid Teigland } 223b3b94faaSDavid Teigland 22416c5f06fSJosef Bacik clone = posix_acl_clone(acl, GFP_NOFS); 225b3b94faaSDavid Teigland error = -ENOMEM; 226b3b94faaSDavid Teigland if (!clone) 227b3b94faaSDavid Teigland goto out; 228b3b94faaSDavid Teigland posix_acl_release(acl); 229b3b94faaSDavid Teigland acl = clone; 230b3b94faaSDavid Teigland 231b60623c2SSteven Whitehouse if (S_ISDIR(ip->i_inode.i_mode)) { 232b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_DEFAULT; 233b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN; 234b3b94faaSDavid Teigland error = gfs2_system_eaops.eo_set(ip, &er); 235b3b94faaSDavid Teigland if (error) 236b3b94faaSDavid Teigland goto out; 237b3b94faaSDavid Teigland } 238b3b94faaSDavid Teigland 239b3b94faaSDavid Teigland error = posix_acl_create_masq(acl, &mode); 240b3b94faaSDavid Teigland if (error < 0) 241b3b94faaSDavid Teigland goto out; 242b3b94faaSDavid Teigland if (error > 0) { 243b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_ACCESS; 244b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN; 245b3b94faaSDavid Teigland posix_acl_to_xattr(acl, er.er_data, er.er_data_len); 246b3b94faaSDavid Teigland er.er_mode = mode; 247b3b94faaSDavid Teigland er.er_flags = GFS2_ERF_MODE; 248b3b94faaSDavid Teigland error = gfs2_system_eaops.eo_set(ip, &er); 249b3b94faaSDavid Teigland if (error) 250b3b94faaSDavid Teigland goto out; 251b3b94faaSDavid Teigland } else 252b3b94faaSDavid Teigland munge_mode(ip, mode); 253b3b94faaSDavid Teigland 254b3b94faaSDavid Teigland out: 255b3b94faaSDavid Teigland posix_acl_release(acl); 256b3b94faaSDavid Teigland kfree(er.er_data); 257b3b94faaSDavid Teigland return error; 258b3b94faaSDavid Teigland } 259b3b94faaSDavid Teigland 260b3b94faaSDavid Teigland int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 261b3b94faaSDavid Teigland { 262b3b94faaSDavid Teigland struct posix_acl *acl = NULL, *clone; 263b3b94faaSDavid Teigland struct gfs2_ea_location el; 264b3b94faaSDavid Teigland char *data; 265b3b94faaSDavid Teigland unsigned int len; 266b3b94faaSDavid Teigland int error; 267b3b94faaSDavid Teigland 268b3b94faaSDavid Teigland error = acl_get(ip, ACL_ACCESS, &acl, &el, &data, &len); 269b3b94faaSDavid Teigland if (error) 270b3b94faaSDavid Teigland return error; 271b3b94faaSDavid Teigland if (!acl) 272b3b94faaSDavid Teigland return gfs2_setattr_simple(ip, attr); 273b3b94faaSDavid Teigland 27416c5f06fSJosef Bacik clone = posix_acl_clone(acl, GFP_NOFS); 275b3b94faaSDavid Teigland error = -ENOMEM; 276b3b94faaSDavid Teigland if (!clone) 277b3b94faaSDavid Teigland goto out; 278b3b94faaSDavid Teigland posix_acl_release(acl); 279b3b94faaSDavid Teigland acl = clone; 280b3b94faaSDavid Teigland 281b3b94faaSDavid Teigland error = posix_acl_chmod_masq(acl, attr->ia_mode); 282b3b94faaSDavid Teigland if (!error) { 283b3b94faaSDavid Teigland posix_acl_to_xattr(acl, data, len); 284b3b94faaSDavid Teigland error = gfs2_ea_acl_chmod(ip, &el, attr, data); 285b3b94faaSDavid Teigland } 286b3b94faaSDavid Teigland 287b3b94faaSDavid Teigland out: 288b3b94faaSDavid Teigland posix_acl_release(acl); 289b3b94faaSDavid Teigland brelse(el.el_bh); 290b3b94faaSDavid Teigland kfree(data); 291b3b94faaSDavid Teigland return error; 292b3b94faaSDavid Teigland } 293b3b94faaSDavid Teigland 294