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> 152646a1f6SSteven Whitehouse #include <linux/xattr.h> 16b3b94faaSDavid Teigland #include <linux/posix_acl.h> 17b3b94faaSDavid Teigland #include <linux/posix_acl_xattr.h> 185c676f6dSSteven Whitehouse #include <linux/gfs2_ondisk.h> 19b3b94faaSDavid Teigland 20b3b94faaSDavid Teigland #include "gfs2.h" 215c676f6dSSteven Whitehouse #include "incore.h" 22b3b94faaSDavid Teigland #include "acl.h" 23307cf6e6SSteven Whitehouse #include "xattr.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 30479c427dSSteven Whitehouse static const char *gfs2_acl_name(int type) 31b3b94faaSDavid Teigland { 32479c427dSSteven Whitehouse switch (type) { 33479c427dSSteven Whitehouse case ACL_TYPE_ACCESS: 34479c427dSSteven Whitehouse return GFS2_POSIX_ACL_ACCESS; 35479c427dSSteven Whitehouse case ACL_TYPE_DEFAULT: 36479c427dSSteven Whitehouse return GFS2_POSIX_ACL_DEFAULT; 37479c427dSSteven Whitehouse } 38479c427dSSteven Whitehouse return NULL; 39479c427dSSteven Whitehouse } 40b3b94faaSDavid Teigland 41479c427dSSteven Whitehouse static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type) 42479c427dSSteven Whitehouse { 43479c427dSSteven Whitehouse struct posix_acl *acl; 44479c427dSSteven Whitehouse const char *name; 45479c427dSSteven Whitehouse char *data; 46479c427dSSteven Whitehouse int len; 4740b78a32SSteven Whitehouse 483767ac21SSteven Whitehouse if (!ip->i_eattr) 49479c427dSSteven Whitehouse return NULL; 50b3b94faaSDavid Teigland 51479c427dSSteven Whitehouse name = gfs2_acl_name(type); 52479c427dSSteven Whitehouse if (name == NULL) 53479c427dSSteven Whitehouse return ERR_PTR(-EINVAL); 54b3b94faaSDavid Teigland 55479c427dSSteven Whitehouse len = gfs2_xattr_acl_get(ip, name, &data); 56479c427dSSteven Whitehouse if (len < 0) 57479c427dSSteven Whitehouse return ERR_PTR(len); 58479c427dSSteven Whitehouse if (len == 0) 59479c427dSSteven Whitehouse return NULL; 60b3b94faaSDavid Teigland 61479c427dSSteven Whitehouse acl = posix_acl_from_xattr(data, len); 6240b78a32SSteven Whitehouse kfree(data); 63479c427dSSteven Whitehouse return acl; 64b3b94faaSDavid Teigland } 65b3b94faaSDavid Teigland 66b3b94faaSDavid Teigland /** 6777386e1fSSteven Whitehouse * gfs2_check_acl - Check an ACL to see if we're allowed to do something 68b3b94faaSDavid Teigland * @inode: the file we want to do something to 69b3b94faaSDavid Teigland * @mask: what we want to do 70b3b94faaSDavid Teigland * 71b3b94faaSDavid Teigland * Returns: errno 72b3b94faaSDavid Teigland */ 73b3b94faaSDavid Teigland 7477386e1fSSteven Whitehouse int gfs2_check_acl(struct inode *inode, int mask) 75b3b94faaSDavid Teigland { 76479c427dSSteven Whitehouse struct posix_acl *acl; 77b3b94faaSDavid Teigland int error; 78b3b94faaSDavid Teigland 79479c427dSSteven Whitehouse acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS); 80479c427dSSteven Whitehouse if (IS_ERR(acl)) 81479c427dSSteven Whitehouse return PTR_ERR(acl); 82b3b94faaSDavid Teigland 83b3b94faaSDavid Teigland if (acl) { 84b3b94faaSDavid Teigland error = posix_acl_permission(inode, acl, mask); 85b3b94faaSDavid Teigland posix_acl_release(acl); 86b3b94faaSDavid Teigland return error; 87b3b94faaSDavid Teigland } 88b3b94faaSDavid Teigland 89b3b94faaSDavid Teigland return -EAGAIN; 90b3b94faaSDavid Teigland } 91b3b94faaSDavid Teigland 9269dca424SSteven Whitehouse static int gfs2_set_mode(struct inode *inode, mode_t mode) 93b3b94faaSDavid Teigland { 9469dca424SSteven Whitehouse int error = 0; 95b3b94faaSDavid Teigland 9669dca424SSteven Whitehouse if (mode != inode->i_mode) { 9769dca424SSteven Whitehouse struct iattr iattr; 98b3b94faaSDavid Teigland 9969dca424SSteven Whitehouse iattr.ia_valid = ATTR_MODE; 10069dca424SSteven Whitehouse iattr.ia_mode = mode; 10169dca424SSteven Whitehouse 10269dca424SSteven Whitehouse error = gfs2_setattr_simple(GFS2_I(inode), &iattr); 103b3b94faaSDavid Teigland } 104b3b94faaSDavid Teigland 10569dca424SSteven Whitehouse return error; 106b3b94faaSDavid Teigland } 107b3b94faaSDavid Teigland 108479c427dSSteven Whitehouse static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) 109b3b94faaSDavid Teigland { 110b3b94faaSDavid Teigland int error; 111479c427dSSteven Whitehouse int len; 112479c427dSSteven Whitehouse char *data; 113479c427dSSteven Whitehouse const char *name = gfs2_acl_name(type); 114479c427dSSteven Whitehouse 115479c427dSSteven Whitehouse BUG_ON(name == NULL); 116479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 117479c427dSSteven Whitehouse if (len == 0) 118479c427dSSteven Whitehouse return 0; 119479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 120479c427dSSteven Whitehouse if (data == NULL) 121479c427dSSteven Whitehouse return -ENOMEM; 122479c427dSSteven Whitehouse error = posix_acl_to_xattr(acl, data, len); 123479c427dSSteven Whitehouse if (error < 0) 124479c427dSSteven Whitehouse goto out; 125479c427dSSteven Whitehouse error = gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, data, len, 0); 126479c427dSSteven Whitehouse out: 127479c427dSSteven Whitehouse kfree(data); 128479c427dSSteven Whitehouse return error; 129479c427dSSteven Whitehouse } 130479c427dSSteven Whitehouse 131479c427dSSteven Whitehouse int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) 132479c427dSSteven Whitehouse { 133479c427dSSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); 134479c427dSSteven Whitehouse struct posix_acl *acl, *clone; 135479c427dSSteven Whitehouse mode_t mode = inode->i_mode; 136479c427dSSteven Whitehouse int error = 0; 137b3b94faaSDavid Teigland 138b3b94faaSDavid Teigland if (!sdp->sd_args.ar_posix_acl) 139b3b94faaSDavid Teigland return 0; 140479c427dSSteven Whitehouse if (S_ISLNK(inode->i_mode)) 141b3b94faaSDavid Teigland return 0; 142b3b94faaSDavid Teigland 143479c427dSSteven Whitehouse acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT); 144479c427dSSteven Whitehouse if (IS_ERR(acl)) 145479c427dSSteven Whitehouse return PTR_ERR(acl); 146b3b94faaSDavid Teigland if (!acl) { 147ce3b0f8dSAl Viro mode &= ~current_umask(); 148479c427dSSteven Whitehouse if (mode != inode->i_mode) 149479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 150b3b94faaSDavid Teigland return error; 151b3b94faaSDavid Teigland } 152b3b94faaSDavid Teigland 153479c427dSSteven Whitehouse if (S_ISDIR(inode->i_mode)) { 154479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); 155479c427dSSteven Whitehouse if (error) 156479c427dSSteven Whitehouse goto out; 157479c427dSSteven Whitehouse } 158479c427dSSteven Whitehouse 15916c5f06fSJosef Bacik clone = posix_acl_clone(acl, GFP_NOFS); 160b3b94faaSDavid Teigland error = -ENOMEM; 161b3b94faaSDavid Teigland if (!clone) 162b3b94faaSDavid Teigland goto out; 163b3b94faaSDavid Teigland posix_acl_release(acl); 164b3b94faaSDavid Teigland acl = clone; 165b3b94faaSDavid Teigland 166b3b94faaSDavid Teigland error = posix_acl_create_masq(acl, &mode); 167b3b94faaSDavid Teigland if (error < 0) 168b3b94faaSDavid Teigland goto out; 16940b78a32SSteven Whitehouse if (error == 0) 17040b78a32SSteven Whitehouse goto munge; 17140b78a32SSteven Whitehouse 172479c427dSSteven Whitehouse error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); 173b3b94faaSDavid Teigland if (error) 174b3b94faaSDavid Teigland goto out; 17540b78a32SSteven Whitehouse munge: 176479c427dSSteven Whitehouse error = gfs2_set_mode(inode, mode); 177b3b94faaSDavid Teigland out: 178b3b94faaSDavid Teigland posix_acl_release(acl); 179b3b94faaSDavid Teigland return error; 180b3b94faaSDavid Teigland } 181b3b94faaSDavid Teigland 182b3b94faaSDavid Teigland int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 183b3b94faaSDavid Teigland { 184479c427dSSteven Whitehouse struct posix_acl *acl, *clone; 185b3b94faaSDavid Teigland char *data; 186b3b94faaSDavid Teigland unsigned int len; 187b3b94faaSDavid Teigland int error; 188b3b94faaSDavid Teigland 189479c427dSSteven Whitehouse acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS); 190479c427dSSteven Whitehouse if (IS_ERR(acl)) 191479c427dSSteven Whitehouse return PTR_ERR(acl); 192b3b94faaSDavid Teigland if (!acl) 193b3b94faaSDavid Teigland return gfs2_setattr_simple(ip, attr); 194b3b94faaSDavid Teigland 19516c5f06fSJosef Bacik clone = posix_acl_clone(acl, GFP_NOFS); 196b3b94faaSDavid Teigland error = -ENOMEM; 197b3b94faaSDavid Teigland if (!clone) 198b3b94faaSDavid Teigland goto out; 199b3b94faaSDavid Teigland posix_acl_release(acl); 200b3b94faaSDavid Teigland acl = clone; 201b3b94faaSDavid Teigland 202b3b94faaSDavid Teigland error = posix_acl_chmod_masq(acl, attr->ia_mode); 203b3b94faaSDavid Teigland if (!error) { 204479c427dSSteven Whitehouse len = posix_acl_to_xattr(acl, NULL, 0); 205479c427dSSteven Whitehouse data = kmalloc(len, GFP_NOFS); 206479c427dSSteven Whitehouse error = -ENOMEM; 207479c427dSSteven Whitehouse if (data == NULL) 208479c427dSSteven Whitehouse goto out; 209b3b94faaSDavid Teigland posix_acl_to_xattr(acl, data, len); 210479c427dSSteven Whitehouse error = gfs2_xattr_acl_chmod(ip, attr, data); 211479c427dSSteven Whitehouse kfree(data); 212b3b94faaSDavid Teigland } 213b3b94faaSDavid Teigland 214b3b94faaSDavid Teigland out: 215b3b94faaSDavid Teigland posix_acl_release(acl); 216b3b94faaSDavid Teigland return error; 217b3b94faaSDavid Teigland } 218b3b94faaSDavid Teigland 2192646a1f6SSteven Whitehouse static int gfs2_acl_type(const char *name) 2202646a1f6SSteven Whitehouse { 2212646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0) 2222646a1f6SSteven Whitehouse return ACL_TYPE_ACCESS; 2232646a1f6SSteven Whitehouse if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0) 2242646a1f6SSteven Whitehouse return ACL_TYPE_DEFAULT; 2252646a1f6SSteven Whitehouse return -EINVAL; 2262646a1f6SSteven Whitehouse } 2272646a1f6SSteven Whitehouse 2282646a1f6SSteven Whitehouse static int gfs2_xattr_system_get(struct inode *inode, const char *name, 2292646a1f6SSteven Whitehouse void *buffer, size_t size) 2302646a1f6SSteven Whitehouse { 2312646a1f6SSteven Whitehouse int type; 2322646a1f6SSteven Whitehouse 2332646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2342646a1f6SSteven Whitehouse if (type < 0) 2352646a1f6SSteven Whitehouse return type; 2362646a1f6SSteven Whitehouse 2372646a1f6SSteven Whitehouse return gfs2_xattr_get(inode, GFS2_EATYPE_SYS, name, buffer, size); 2382646a1f6SSteven Whitehouse } 2392646a1f6SSteven Whitehouse 2402646a1f6SSteven Whitehouse 2412646a1f6SSteven Whitehouse static int gfs2_xattr_system_set(struct inode *inode, const char *name, 2422646a1f6SSteven Whitehouse const void *value, size_t size, int flags) 2432646a1f6SSteven Whitehouse { 2442646a1f6SSteven Whitehouse struct gfs2_sbd *sdp = GFS2_SB(inode); 2452646a1f6SSteven Whitehouse struct posix_acl *acl = NULL; 2462646a1f6SSteven Whitehouse int error = 0, type; 2472646a1f6SSteven Whitehouse 2482646a1f6SSteven Whitehouse if (!sdp->sd_args.ar_posix_acl) 2492646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2502646a1f6SSteven Whitehouse 2512646a1f6SSteven Whitehouse type = gfs2_acl_type(name); 2522646a1f6SSteven Whitehouse if (type < 0) 2532646a1f6SSteven Whitehouse return type; 2542646a1f6SSteven Whitehouse if (flags & XATTR_CREATE) 2552646a1f6SSteven Whitehouse return -EINVAL; 2562646a1f6SSteven Whitehouse if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) 2572646a1f6SSteven Whitehouse return value ? -EACCES : 0; 2582646a1f6SSteven Whitehouse if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) 2592646a1f6SSteven Whitehouse return -EPERM; 2602646a1f6SSteven Whitehouse if (S_ISLNK(inode->i_mode)) 2612646a1f6SSteven Whitehouse return -EOPNOTSUPP; 2622646a1f6SSteven Whitehouse 2632646a1f6SSteven Whitehouse if (!value) 2642646a1f6SSteven Whitehouse goto set_acl; 2652646a1f6SSteven Whitehouse 2662646a1f6SSteven Whitehouse acl = posix_acl_from_xattr(value, size); 2672646a1f6SSteven Whitehouse if (!acl) { 2682646a1f6SSteven Whitehouse /* 2692646a1f6SSteven Whitehouse * acl_set_file(3) may request that we set default ACLs with 2702646a1f6SSteven Whitehouse * zero length -- defend (gracefully) against that here. 2712646a1f6SSteven Whitehouse */ 2722646a1f6SSteven Whitehouse goto out; 2732646a1f6SSteven Whitehouse } 2742646a1f6SSteven Whitehouse if (IS_ERR(acl)) { 2752646a1f6SSteven Whitehouse error = PTR_ERR(acl); 2762646a1f6SSteven Whitehouse goto out; 2772646a1f6SSteven Whitehouse } 2782646a1f6SSteven Whitehouse 2792646a1f6SSteven Whitehouse error = posix_acl_valid(acl); 2802646a1f6SSteven Whitehouse if (error) 2812646a1f6SSteven Whitehouse goto out_release; 2822646a1f6SSteven Whitehouse 2832646a1f6SSteven Whitehouse error = -EINVAL; 2842646a1f6SSteven Whitehouse if (acl->a_count > GFS2_ACL_MAX_ENTRIES) 2852646a1f6SSteven Whitehouse goto out_release; 2862646a1f6SSteven Whitehouse 2872646a1f6SSteven Whitehouse if (type == ACL_TYPE_ACCESS) { 2882646a1f6SSteven Whitehouse mode_t mode = inode->i_mode; 2892646a1f6SSteven Whitehouse error = posix_acl_equiv_mode(acl, &mode); 2902646a1f6SSteven Whitehouse 2912646a1f6SSteven Whitehouse if (error <= 0) { 2922646a1f6SSteven Whitehouse posix_acl_release(acl); 2932646a1f6SSteven Whitehouse acl = NULL; 2942646a1f6SSteven Whitehouse 2952646a1f6SSteven Whitehouse if (error < 0) 2962646a1f6SSteven Whitehouse return error; 2972646a1f6SSteven Whitehouse } 2982646a1f6SSteven Whitehouse 2992646a1f6SSteven Whitehouse error = gfs2_set_mode(inode, mode); 3002646a1f6SSteven Whitehouse if (error) 3012646a1f6SSteven Whitehouse goto out_release; 3022646a1f6SSteven Whitehouse } 3032646a1f6SSteven Whitehouse 3042646a1f6SSteven Whitehouse set_acl: 3052646a1f6SSteven Whitehouse error = gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, value, size, 0); 3062646a1f6SSteven Whitehouse out_release: 3072646a1f6SSteven Whitehouse posix_acl_release(acl); 3082646a1f6SSteven Whitehouse out: 3092646a1f6SSteven Whitehouse return error; 3102646a1f6SSteven Whitehouse } 3112646a1f6SSteven Whitehouse 3122646a1f6SSteven Whitehouse struct xattr_handler gfs2_xattr_system_handler = { 3132646a1f6SSteven Whitehouse .prefix = XATTR_SYSTEM_PREFIX, 3142646a1f6SSteven Whitehouse .get = gfs2_xattr_system_get, 3152646a1f6SSteven Whitehouse .set = gfs2_xattr_system_set, 3162646a1f6SSteven Whitehouse }; 3172646a1f6SSteven Whitehouse 318