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   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 "cifsfs.h"
  25 #include "cifspdu.h"
  26 #include "cifsglob.h"
  27 #include "cifsproto.h"
  28 #include "cifs_debug.h"
  29
  30 #define MAX_EA_VALUE_SIZE 65535
  31 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
  32 #define CIFS_XATTR_USER_PREFIX "user."
  33 #define CIFS_XATTR_SYSTEM_PREFIX "system."
  34 #define CIFS_XATTR_OS2_PREFIX "os2."
  35 #define CIFS_XATTR_SECURITY_PREFIX ".security"
  36 #define CIFS_XATTR_TRUSTED_PREFIX "trusted."
  37 #define XATTR_TRUSTED_PREFIX_LEN  8
  38 #define XATTR_SECURITY_PREFIX_LEN 9
  39 /* BB need to add server (Samba e.g) support for security and trusted prefix */
  40
  41
  42
  43 int cifs_removexattr(struct dentry *direntry, const char *ea_name)
  44 {
  45         int rc = -EOPNOTSUPP;
  46 #ifdef CONFIG_CIFS_XATTR
  47         int xid;
  48         struct cifs_sb_info *cifs_sb;
  49         struct cifsTconInfo *pTcon;
  50         struct super_block *sb;
  51         char *full_path;
  52
  53         if (direntry == NULL)
  54                 return -EIO;
  55         if (direntry->d_inode == NULL)
  56                 return -EIO;
  57         sb = direntry->d_inode->i_sb;
  58         if (sb == NULL)
  59                 return -EIO;
  60         xid = GetXid();
  61
  62         cifs_sb = CIFS_SB(sb);
  63         pTcon = cifs_sb->tcon;
  64
  65         full_path = build_path_from_dentry(direntry);
  66         if (full_path == NULL) {
  67                 FreeXid(xid);
  68                 return -ENOMEM;
  69         }
  70         if (ea_name == NULL) {
  71                 cFYI(1, ("Null xattr names not supported"));
  72         } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5)
  73                 && (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4))) {
  74                 cFYI(1,
  75                     ("illegal xattr request %s (only user namespace supported)",
  76                         ea_name));
  77                 /* BB what if no namespace prefix? */
  78                 /* Should we just pass them to server, except for
  79                 system and perhaps security prefixes? */
  80         } else {
  81                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
  82                         goto remove_ea_exit;
  83
  84                 ea_name += 5; /* skip past user. prefix */
  85                 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL,
  86                         (__u16)0, cifs_sb->local_nls,
  87                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
  88         }
  89 remove_ea_exit:
  90         kfree(full_path);
  91         FreeXid(xid);
  92 #endif
  93         return rc;
  94 }
  95
  96 int cifs_setxattr(struct dentry *direntry, const char *ea_name,
  97                   const void *ea_value, size_t value_size, int flags)
  98 {
  99         int rc = -EOPNOTSUPP;
 100 #ifdef CONFIG_CIFS_XATTR
 101         int xid;
 102         struct cifs_sb_info *cifs_sb;
 103         struct cifsTconInfo *pTcon;
 104         struct super_block *sb;
 105         char *full_path;
 106
 107         if (direntry == NULL)
 108                 return -EIO;
 109         if (direntry->d_inode == NULL)
 110                 return -EIO;
 111         sb = direntry->d_inode->i_sb;
 112         if (sb == NULL)
 113                 return -EIO;
 114         xid = GetXid();
 115
 116         cifs_sb = CIFS_SB(sb);
 117         pTcon = cifs_sb->tcon;
 118
 119         full_path = build_path_from_dentry(direntry);
 120         if (full_path == NULL) {
 121                 FreeXid(xid);
 122                 return -ENOMEM;
 123         }
 124         /* return dos attributes as pseudo xattr */
 125         /* return alt name if available as pseudo attr */
 126
 127         /* if proc/fs/cifs/streamstoxattr is set then
 128                 search server for EAs or streams to
 129                 returns as xattrs */
 130         if (value_size > MAX_EA_VALUE_SIZE) {
 131                 cFYI(1, ("size of EA value too large"));
 132                 kfree(full_path);
 133                 FreeXid(xid);
 134                 return -EOPNOTSUPP;
 135         }
 136
 137         if (ea_name == NULL) {
 138                 cFYI(1, ("Null xattr names not supported"));
 139         } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
 140                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 141                         goto set_ea_exit;
 142                 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
 143                         cFYI(1, ("attempt to set cifs inode metadata"));
 144                 }
 145                 ea_name += 5; /* skip past user. prefix */
 146                 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
 147                         (__u16)value_size, cifs_sb->local_nls,
 148                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 149         } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
 150                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 151                         goto set_ea_exit;
 152
 153                 ea_name += 4; /* skip past os2. prefix */
 154                 rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
 155                         (__u16)value_size, cifs_sb->local_nls,
 156                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 157         } else {
 158                 int temp;
 159                 temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
 160                         strlen(POSIX_ACL_XATTR_ACCESS));
 161                 if (temp == 0) {
 162 #ifdef CONFIG_CIFS_POSIX
 163                         if (sb->s_flags & MS_POSIXACL)
 164                                 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
 165                                         ea_value, (const int)value_size,
 166                                         ACL_TYPE_ACCESS, cifs_sb->local_nls,
 167                                         cifs_sb->mnt_cifs_flags &
 168                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 169                         cFYI(1, ("set POSIX ACL rc %d", rc));
 170 #else
 171                         cFYI(1, ("set POSIX ACL not supported"));
 172 #endif
 173                 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
 174                                    strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 175 #ifdef CONFIG_CIFS_POSIX
 176                         if (sb->s_flags & MS_POSIXACL)
 177                                 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
 178                                         ea_value, (const int)value_size,
 179                                         ACL_TYPE_DEFAULT, cifs_sb->local_nls,
 180                                         cifs_sb->mnt_cifs_flags &
 181                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 182                         cFYI(1, ("set POSIX default ACL rc %d", rc));
 183 #else
 184                         cFYI(1, ("set default POSIX ACL not supported"));
 185 #endif
 186                 } else {
 187                         cFYI(1, ("illegal xattr request %s (only user namespace supported)", ea_name));
 188                   /* BB what if no namespace prefix? */
 189                   /* Should we just pass them to server, except for
 190                   system and perhaps security prefixes? */
 191                 }
 192         }
 193
 194 set_ea_exit:
 195         kfree(full_path);
 196         FreeXid(xid);
 197 #endif
 198         return rc;
 199 }
 200
 201 ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
 202         void *ea_value, size_t buf_size)
 203 {
 204         ssize_t rc = -EOPNOTSUPP;
 205 #ifdef CONFIG_CIFS_XATTR
 206         int xid;
 207         struct cifs_sb_info *cifs_sb;
 208         struct cifsTconInfo *pTcon;
 209         struct super_block *sb;
 210         char *full_path;
 211
 212         if (direntry == NULL)
 213                 return -EIO;
 214         if (direntry->d_inode == NULL)
 215                 return -EIO;
 216         sb = direntry->d_inode->i_sb;
 217         if (sb == NULL)
 218                 return -EIO;
 219
 220         xid = GetXid();
 221
 222         cifs_sb = CIFS_SB(sb);
 223         pTcon = cifs_sb->tcon;
 224
 225         full_path = build_path_from_dentry(direntry);
 226         if (full_path == NULL) {
 227                 FreeXid(xid);
 228                 return -ENOMEM;
 229         }
 230         /* return dos attributes as pseudo xattr */
 231         /* return alt name if available as pseudo attr */
 232         if (ea_name == NULL) {
 233                 cFYI(1, ("Null xattr names not supported"));
 234         } else if (strncmp(ea_name, CIFS_XATTR_USER_PREFIX, 5) == 0) {
 235                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 236                         goto get_ea_exit;
 237
 238                 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
 239                         cFYI(1, ("attempt to query cifs inode metadata"));
 240                         /* revalidate/getattr then populate from inode */
 241                 } /* BB add else when above is implemented */
 242                 ea_name += 5; /* skip past user. prefix */
 243                 rc = CIFSSMBQueryEA(xid, pTcon, full_path, ea_name, ea_value,
 244                         buf_size, cifs_sb->local_nls,
 245                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 246         } else if (strncmp(ea_name, CIFS_XATTR_OS2_PREFIX, 4) == 0) {
 247                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 248                         goto get_ea_exit;
 249
 250                 ea_name += 4; /* skip past os2. prefix */
 251                 rc = CIFSSMBQueryEA(xid, pTcon, full_path, ea_name, ea_value,
 252                         buf_size, cifs_sb->local_nls,
 253                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 254         } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
 255                           strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
 256 #ifdef CONFIG_CIFS_POSIX
 257                 if (sb->s_flags & MS_POSIXACL)
 258                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 259                                 ea_value, buf_size, ACL_TYPE_ACCESS,
 260                                 cifs_sb->local_nls,
 261                                 cifs_sb->mnt_cifs_flags &
 262                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 263 /*              else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 264                         __u16 fid;
 265                         int oplock = FALSE;
 266                         rc = CIFSSMBOpen(xid, pTcon, full_path,
 267                                          FILE_OPEN, GENERIC_READ, 0, &fid,
 268                                          &oplock, NULL, cifs_sb->local_nls,
 269                                          cifs_sb->mnt_cifs_flags &
 270                                          CIFS_MOUNT_MAP_SPECIAL_CHR);
 271                         if(rc == 0) {
 272                                 rc = CIFSSMBGetCIFSACL(xid, pTcon, fid,
 273                                         ea_value, buf_size,
 274                                         ACL_TYPE_ACCESS);
 275                                 CIFSSMBClose(xid, pTcon, fid);
 276                         }
 277                 } */  /* BB enable after fixing up return data */
 278 #else
 279                 cFYI(1, ("query POSIX ACL not supported yet"));
 280 #endif /* CONFIG_CIFS_POSIX */
 281         } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
 282                           strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 283 #ifdef CONFIG_CIFS_POSIX
 284                 if (sb->s_flags & MS_POSIXACL)
 285                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 286                                 ea_value, buf_size, ACL_TYPE_DEFAULT,
 287                                 cifs_sb->local_nls,
 288                                 cifs_sb->mnt_cifs_flags &
 289                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 290 #else
 291                 cFYI(1, ("query POSIX default ACL not supported yet"));
 292 #endif
 293         } else if (strncmp(ea_name,
 294                   CIFS_XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
 295                 cFYI(1, ("Trusted xattr namespace not supported yet"));
 296         } else if (strncmp(ea_name,
 297                   CIFS_XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
 298                 cFYI(1, ("Security xattr namespace not supported yet"));
 299         } else {
 300                 cFYI(1,
 301                     ("illegal xattr request %s (only user namespace supported)",
 302                         ea_name));
 303         }
 304
 305         /* We could add an additional check for streams ie
 306             if proc/fs/cifs/streamstoxattr is set then
 307                 search server for EAs or streams to
 308                 returns as xattrs */
 309
 310         if (rc == -EINVAL)
 311                 rc = -EOPNOTSUPP;
 312
 313 get_ea_exit:
 314         kfree(full_path);
 315         FreeXid(xid);
 316 #endif
 317         return rc;
 318 }
 319
 320 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 321 {
 322         ssize_t rc = -EOPNOTSUPP;
 323 #ifdef CONFIG_CIFS_XATTR
 324         int xid;
 325         struct cifs_sb_info *cifs_sb;
 326         struct cifsTconInfo *pTcon;
 327         struct super_block *sb;
 328         char *full_path;
 329
 330         if (direntry == NULL)
 331                 return -EIO;
 332         if (direntry->d_inode == NULL)
 333                 return -EIO;
 334         sb = direntry->d_inode->i_sb;
 335         if (sb == NULL)
 336                 return -EIO;
 337
 338         cifs_sb = CIFS_SB(sb);
 339         pTcon = cifs_sb->tcon;
 340
 341         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 342                 return -EOPNOTSUPP;
 343
 344         xid = GetXid();
 345
 346         full_path = build_path_from_dentry(direntry);
 347         if (full_path == NULL) {
 348                 FreeXid(xid);
 349                 return -ENOMEM;
 350         }
 351         /* return dos attributes as pseudo xattr */
 352         /* return alt name if available as pseudo attr */
 353
 354         /* if proc/fs/cifs/streamstoxattr is set then
 355                 search server for EAs or streams to
 356                 returns as xattrs */
 357         rc = CIFSSMBQAllEAs(xid, pTcon, full_path, data, buf_size,
 358                                 cifs_sb->local_nls,
 359                                 cifs_sb->mnt_cifs_flags &
 360                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 361
 362         kfree(full_path);
 363         FreeXid(xid);
 364 #endif
 365         return rc;
 366 }