| 1 | /* |
| 2 | * fs/cifs/xattr.c |
| 3 | * |
| 4 | * Copyright (c) International Business Machines Corp., 2003, 2007 |
| 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Lesser General Public License as published |
| 9 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | * the GNU Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public License |
| 18 | * along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/posix_acl_xattr.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/xattr.h> |
| 26 | #include "cifsfs.h" |
| 27 | #include "cifspdu.h" |
| 28 | #include "cifsglob.h" |
| 29 | #include "cifsproto.h" |
| 30 | #include "cifs_debug.h" |
| 31 | #include "cifs_fs_sb.h" |
| 32 | #include "cifs_unicode.h" |
| 33 | |
| 34 | #define MAX_EA_VALUE_SIZE 65535 |
| 35 | #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib" |
| 36 | #define CIFS_XATTR_CIFS_ACL "system.cifs_acl" |
| 37 | |
| 38 | /* BB need to add server (Samba e.g) support for security and trusted prefix */ |
| 39 | |
| 40 | int cifs_removexattr(struct dentry *direntry, const char *ea_name) |
| 41 | { |
| 42 | int rc = -EOPNOTSUPP; |
| 43 | #ifdef CONFIG_CIFS_XATTR |
| 44 | unsigned int xid; |
| 45 | struct cifs_sb_info *cifs_sb; |
| 46 | struct tcon_link *tlink; |
| 47 | struct cifs_tcon *pTcon; |
| 48 | struct super_block *sb; |
| 49 | char *full_path = NULL; |
| 50 | |
| 51 | if (direntry == NULL) |
| 52 | return -EIO; |
| 53 | if (d_really_is_negative(direntry)) |
| 54 | return -EIO; |
| 55 | sb = d_inode(direntry)->i_sb; |
| 56 | if (sb == NULL) |
| 57 | return -EIO; |
| 58 | |
| 59 | cifs_sb = CIFS_SB(sb); |
| 60 | tlink = cifs_sb_tlink(cifs_sb); |
| 61 | if (IS_ERR(tlink)) |
| 62 | return PTR_ERR(tlink); |
| 63 | pTcon = tlink_tcon(tlink); |
| 64 | |
| 65 | xid = get_xid(); |
| 66 | |
| 67 | full_path = build_path_from_dentry(direntry); |
| 68 | if (full_path == NULL) { |
| 69 | rc = -ENOMEM; |
| 70 | goto remove_ea_exit; |
| 71 | } |
| 72 | if (ea_name == NULL) { |
| 73 | cifs_dbg(FYI, "Null xattr names not supported\n"); |
| 74 | } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) |
| 75 | && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) { |
| 76 | cifs_dbg(FYI, |
| 77 | "illegal xattr request %s (only user namespace supported)\n", |
| 78 | ea_name); |
| 79 | /* BB what if no namespace prefix? */ |
| 80 | /* Should we just pass them to server, except for |
| 81 | system and perhaps security prefixes? */ |
| 82 | } else { |
| 83 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 84 | goto remove_ea_exit; |
| 85 | |
| 86 | ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ |
| 87 | if (pTcon->ses->server->ops->set_EA) |
| 88 | rc = pTcon->ses->server->ops->set_EA(xid, pTcon, |
| 89 | full_path, ea_name, NULL, (__u16)0, |
| 90 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 91 | } |
| 92 | remove_ea_exit: |
| 93 | kfree(full_path); |
| 94 | free_xid(xid); |
| 95 | cifs_put_tlink(tlink); |
| 96 | #endif |
| 97 | return rc; |
| 98 | } |
| 99 | |
| 100 | int cifs_setxattr(struct dentry *direntry, const char *ea_name, |
| 101 | const void *ea_value, size_t value_size, int flags) |
| 102 | { |
| 103 | int rc = -EOPNOTSUPP; |
| 104 | #ifdef CONFIG_CIFS_XATTR |
| 105 | unsigned int xid; |
| 106 | struct cifs_sb_info *cifs_sb; |
| 107 | struct tcon_link *tlink; |
| 108 | struct cifs_tcon *pTcon; |
| 109 | struct super_block *sb; |
| 110 | char *full_path; |
| 111 | |
| 112 | if (direntry == NULL) |
| 113 | return -EIO; |
| 114 | if (d_really_is_negative(direntry)) |
| 115 | return -EIO; |
| 116 | sb = d_inode(direntry)->i_sb; |
| 117 | if (sb == NULL) |
| 118 | return -EIO; |
| 119 | |
| 120 | cifs_sb = CIFS_SB(sb); |
| 121 | tlink = cifs_sb_tlink(cifs_sb); |
| 122 | if (IS_ERR(tlink)) |
| 123 | return PTR_ERR(tlink); |
| 124 | pTcon = tlink_tcon(tlink); |
| 125 | |
| 126 | xid = get_xid(); |
| 127 | |
| 128 | full_path = build_path_from_dentry(direntry); |
| 129 | if (full_path == NULL) { |
| 130 | rc = -ENOMEM; |
| 131 | goto set_ea_exit; |
| 132 | } |
| 133 | /* return dos attributes as pseudo xattr */ |
| 134 | /* return alt name if available as pseudo attr */ |
| 135 | |
| 136 | /* if proc/fs/cifs/streamstoxattr is set then |
| 137 | search server for EAs or streams to |
| 138 | returns as xattrs */ |
| 139 | if (value_size > MAX_EA_VALUE_SIZE) { |
| 140 | cifs_dbg(FYI, "size of EA value too large\n"); |
| 141 | rc = -EOPNOTSUPP; |
| 142 | goto set_ea_exit; |
| 143 | } |
| 144 | |
| 145 | if (ea_name == NULL) { |
| 146 | cifs_dbg(FYI, "Null xattr names not supported\n"); |
| 147 | } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) |
| 148 | == 0) { |
| 149 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 150 | goto set_ea_exit; |
| 151 | if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) |
| 152 | cifs_dbg(FYI, "attempt to set cifs inode metadata\n"); |
| 153 | |
| 154 | ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ |
| 155 | if (pTcon->ses->server->ops->set_EA) |
| 156 | rc = pTcon->ses->server->ops->set_EA(xid, pTcon, |
| 157 | full_path, ea_name, ea_value, (__u16)value_size, |
| 158 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 159 | } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) |
| 160 | == 0) { |
| 161 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 162 | goto set_ea_exit; |
| 163 | |
| 164 | ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */ |
| 165 | if (pTcon->ses->server->ops->set_EA) |
| 166 | rc = pTcon->ses->server->ops->set_EA(xid, pTcon, |
| 167 | full_path, ea_name, ea_value, (__u16)value_size, |
| 168 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 169 | } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL, |
| 170 | strlen(CIFS_XATTR_CIFS_ACL)) == 0) { |
| 171 | #ifdef CONFIG_CIFS_ACL |
| 172 | struct cifs_ntsd *pacl; |
| 173 | pacl = kmalloc(value_size, GFP_KERNEL); |
| 174 | if (!pacl) { |
| 175 | rc = -ENOMEM; |
| 176 | } else { |
| 177 | memcpy(pacl, ea_value, value_size); |
| 178 | if (pTcon->ses->server->ops->set_acl) |
| 179 | rc = pTcon->ses->server->ops->set_acl(pacl, |
| 180 | value_size, d_inode(direntry), |
| 181 | full_path, CIFS_ACL_DACL); |
| 182 | else |
| 183 | rc = -EOPNOTSUPP; |
| 184 | if (rc == 0) /* force revalidate of the inode */ |
| 185 | CIFS_I(d_inode(direntry))->time = 0; |
| 186 | kfree(pacl); |
| 187 | } |
| 188 | #else |
| 189 | cifs_dbg(FYI, "Set CIFS ACL not supported yet\n"); |
| 190 | #endif /* CONFIG_CIFS_ACL */ |
| 191 | } else { |
| 192 | int temp; |
| 193 | temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, |
| 194 | strlen(POSIX_ACL_XATTR_ACCESS)); |
| 195 | if (temp == 0) { |
| 196 | #ifdef CONFIG_CIFS_POSIX |
| 197 | if (sb->s_flags & MS_POSIXACL) |
| 198 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
| 199 | ea_value, (const int)value_size, |
| 200 | ACL_TYPE_ACCESS, cifs_sb->local_nls, |
| 201 | cifs_remap(cifs_sb)); |
| 202 | cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc); |
| 203 | #else |
| 204 | cifs_dbg(FYI, "set POSIX ACL not supported\n"); |
| 205 | #endif |
| 206 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, |
| 207 | strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { |
| 208 | #ifdef CONFIG_CIFS_POSIX |
| 209 | if (sb->s_flags & MS_POSIXACL) |
| 210 | rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, |
| 211 | ea_value, (const int)value_size, |
| 212 | ACL_TYPE_DEFAULT, cifs_sb->local_nls, |
| 213 | cifs_remap(cifs_sb)); |
| 214 | cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc); |
| 215 | #else |
| 216 | cifs_dbg(FYI, "set default POSIX ACL not supported\n"); |
| 217 | #endif |
| 218 | } else { |
| 219 | cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n", |
| 220 | ea_name); |
| 221 | /* BB what if no namespace prefix? */ |
| 222 | /* Should we just pass them to server, except for |
| 223 | system and perhaps security prefixes? */ |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | set_ea_exit: |
| 228 | kfree(full_path); |
| 229 | free_xid(xid); |
| 230 | cifs_put_tlink(tlink); |
| 231 | #endif |
| 232 | return rc; |
| 233 | } |
| 234 | |
| 235 | ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name, |
| 236 | void *ea_value, size_t buf_size) |
| 237 | { |
| 238 | ssize_t rc = -EOPNOTSUPP; |
| 239 | #ifdef CONFIG_CIFS_XATTR |
| 240 | unsigned int xid; |
| 241 | struct cifs_sb_info *cifs_sb; |
| 242 | struct tcon_link *tlink; |
| 243 | struct cifs_tcon *pTcon; |
| 244 | struct super_block *sb; |
| 245 | char *full_path; |
| 246 | |
| 247 | if (direntry == NULL) |
| 248 | return -EIO; |
| 249 | if (d_really_is_negative(direntry)) |
| 250 | return -EIO; |
| 251 | sb = d_inode(direntry)->i_sb; |
| 252 | if (sb == NULL) |
| 253 | return -EIO; |
| 254 | |
| 255 | cifs_sb = CIFS_SB(sb); |
| 256 | tlink = cifs_sb_tlink(cifs_sb); |
| 257 | if (IS_ERR(tlink)) |
| 258 | return PTR_ERR(tlink); |
| 259 | pTcon = tlink_tcon(tlink); |
| 260 | |
| 261 | xid = get_xid(); |
| 262 | |
| 263 | full_path = build_path_from_dentry(direntry); |
| 264 | if (full_path == NULL) { |
| 265 | rc = -ENOMEM; |
| 266 | goto get_ea_exit; |
| 267 | } |
| 268 | /* return dos attributes as pseudo xattr */ |
| 269 | /* return alt name if available as pseudo attr */ |
| 270 | if (ea_name == NULL) { |
| 271 | cifs_dbg(FYI, "Null xattr names not supported\n"); |
| 272 | } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) |
| 273 | == 0) { |
| 274 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 275 | goto get_ea_exit; |
| 276 | |
| 277 | if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) { |
| 278 | cifs_dbg(FYI, "attempt to query cifs inode metadata\n"); |
| 279 | /* revalidate/getattr then populate from inode */ |
| 280 | } /* BB add else when above is implemented */ |
| 281 | ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ |
| 282 | if (pTcon->ses->server->ops->query_all_EAs) |
| 283 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, |
| 284 | full_path, ea_name, ea_value, buf_size, |
| 285 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 286 | } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) { |
| 287 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 288 | goto get_ea_exit; |
| 289 | |
| 290 | ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */ |
| 291 | if (pTcon->ses->server->ops->query_all_EAs) |
| 292 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, |
| 293 | full_path, ea_name, ea_value, buf_size, |
| 294 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 295 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, |
| 296 | strlen(POSIX_ACL_XATTR_ACCESS)) == 0) { |
| 297 | #ifdef CONFIG_CIFS_POSIX |
| 298 | if (sb->s_flags & MS_POSIXACL) |
| 299 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
| 300 | ea_value, buf_size, ACL_TYPE_ACCESS, |
| 301 | cifs_sb->local_nls, |
| 302 | cifs_remap(cifs_sb)); |
| 303 | #else |
| 304 | cifs_dbg(FYI, "Query POSIX ACL not supported yet\n"); |
| 305 | #endif /* CONFIG_CIFS_POSIX */ |
| 306 | } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, |
| 307 | strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { |
| 308 | #ifdef CONFIG_CIFS_POSIX |
| 309 | if (sb->s_flags & MS_POSIXACL) |
| 310 | rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, |
| 311 | ea_value, buf_size, ACL_TYPE_DEFAULT, |
| 312 | cifs_sb->local_nls, |
| 313 | cifs_remap(cifs_sb)); |
| 314 | #else |
| 315 | cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n"); |
| 316 | #endif /* CONFIG_CIFS_POSIX */ |
| 317 | } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL, |
| 318 | strlen(CIFS_XATTR_CIFS_ACL)) == 0) { |
| 319 | #ifdef CONFIG_CIFS_ACL |
| 320 | u32 acllen; |
| 321 | struct cifs_ntsd *pacl; |
| 322 | |
| 323 | if (pTcon->ses->server->ops->get_acl == NULL) |
| 324 | goto get_ea_exit; /* rc already EOPNOTSUPP */ |
| 325 | |
| 326 | pacl = pTcon->ses->server->ops->get_acl(cifs_sb, |
| 327 | d_inode(direntry), full_path, &acllen); |
| 328 | if (IS_ERR(pacl)) { |
| 329 | rc = PTR_ERR(pacl); |
| 330 | cifs_dbg(VFS, "%s: error %zd getting sec desc\n", |
| 331 | __func__, rc); |
| 332 | } else { |
| 333 | if (ea_value) { |
| 334 | if (acllen > buf_size) |
| 335 | acllen = -ERANGE; |
| 336 | else |
| 337 | memcpy(ea_value, pacl, acllen); |
| 338 | } |
| 339 | rc = acllen; |
| 340 | kfree(pacl); |
| 341 | } |
| 342 | #else |
| 343 | cifs_dbg(FYI, "Query CIFS ACL not supported yet\n"); |
| 344 | #endif /* CONFIG_CIFS_ACL */ |
| 345 | } else if (strncmp(ea_name, |
| 346 | XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) { |
| 347 | cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n"); |
| 348 | } else if (strncmp(ea_name, |
| 349 | XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) { |
| 350 | cifs_dbg(FYI, "Security xattr namespace not supported yet\n"); |
| 351 | } else |
| 352 | cifs_dbg(FYI, |
| 353 | "illegal xattr request %s (only user namespace supported)\n", |
| 354 | ea_name); |
| 355 | |
| 356 | /* We could add an additional check for streams ie |
| 357 | if proc/fs/cifs/streamstoxattr is set then |
| 358 | search server for EAs or streams to |
| 359 | returns as xattrs */ |
| 360 | |
| 361 | if (rc == -EINVAL) |
| 362 | rc = -EOPNOTSUPP; |
| 363 | |
| 364 | get_ea_exit: |
| 365 | kfree(full_path); |
| 366 | free_xid(xid); |
| 367 | cifs_put_tlink(tlink); |
| 368 | #endif |
| 369 | return rc; |
| 370 | } |
| 371 | |
| 372 | ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) |
| 373 | { |
| 374 | ssize_t rc = -EOPNOTSUPP; |
| 375 | #ifdef CONFIG_CIFS_XATTR |
| 376 | unsigned int xid; |
| 377 | struct cifs_sb_info *cifs_sb; |
| 378 | struct tcon_link *tlink; |
| 379 | struct cifs_tcon *pTcon; |
| 380 | struct super_block *sb; |
| 381 | char *full_path; |
| 382 | |
| 383 | if (direntry == NULL) |
| 384 | return -EIO; |
| 385 | if (d_really_is_negative(direntry)) |
| 386 | return -EIO; |
| 387 | sb = d_inode(direntry)->i_sb; |
| 388 | if (sb == NULL) |
| 389 | return -EIO; |
| 390 | |
| 391 | cifs_sb = CIFS_SB(sb); |
| 392 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| 393 | return -EOPNOTSUPP; |
| 394 | |
| 395 | tlink = cifs_sb_tlink(cifs_sb); |
| 396 | if (IS_ERR(tlink)) |
| 397 | return PTR_ERR(tlink); |
| 398 | pTcon = tlink_tcon(tlink); |
| 399 | |
| 400 | xid = get_xid(); |
| 401 | |
| 402 | full_path = build_path_from_dentry(direntry); |
| 403 | if (full_path == NULL) { |
| 404 | rc = -ENOMEM; |
| 405 | goto list_ea_exit; |
| 406 | } |
| 407 | /* return dos attributes as pseudo xattr */ |
| 408 | /* return alt name if available as pseudo attr */ |
| 409 | |
| 410 | /* if proc/fs/cifs/streamstoxattr is set then |
| 411 | search server for EAs or streams to |
| 412 | returns as xattrs */ |
| 413 | |
| 414 | if (pTcon->ses->server->ops->query_all_EAs) |
| 415 | rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon, |
| 416 | full_path, NULL, data, buf_size, |
| 417 | cifs_sb->local_nls, cifs_remap(cifs_sb)); |
| 418 | list_ea_exit: |
| 419 | kfree(full_path); |
| 420 | free_xid(xid); |
| 421 | cifs_put_tlink(tlink); |
| 422 | #endif |
| 423 | return rc; |
| 424 | } |