/* * fs/cifs/xattr.c * * Copyright (c) International Business Machines Corp., 2003, 2007 * Author(s): Steve French (sfrench@us.ibm.com) * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/fs.h> #include <linux/posix_acl_xattr.h> #include <linux/slab.h> #include <linux/xattr.h> #include "cifsfs.h" #include "cifspdu.h" #include "cifsglob.h" #include "cifsproto.h" #include "cifs_debug.h" #define MAX_EA_VALUE_SIZE 65535 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib" #define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* BB need to add server (Samba e.g) support for security and trusted prefix */ int cifs_removexattr(struct dentry *direntry, const char *ea_name) { int rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR unsigned int xid; struct cifs_sb_info *cifs_sb; struct tcon_link *tlink; struct cifs_tcon *pTcon; struct super_block *sb; char *full_path = NULL; if (direntry == NULL) return -EIO; if (direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if (sb == NULL) return -EIO; cifs_sb = CIFS_SB(sb); tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); pTcon = tlink_tcon(tlink); xid = get_xid(); full_path = build_path_from_dentry(direntry); if (full_path == NULL) { rc = -ENOMEM; goto remove_ea_exit; } if (ea_name == NULL) { cFYI(1, "Null xattr names not supported"); } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) { cFYI(1, "illegal xattr request %s (only user namespace supported)", ea_name); /* BB what if no namespace prefix? */ /* Should we just pass them to server, except for system and perhaps security prefixes? */ } else { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto remove_ea_exit; ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL, (__u16)0, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } remove_ea_exit: kfree(full_path); free_xid(xid); cifs_put_tlink(tlink); #endif return rc; } int cifs_setxattr(struct dentry *direntry, const char *ea_name, const void *ea_value, size_t value_size, int flags) { int rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR unsigned int xid; struct cifs_sb_info *cifs_sb; struct tcon_link *tlink; struct cifs_tcon *pTcon; struct super_block *sb; char *full_path; if (direntry == NULL) return -EIO; if (direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if (sb == NULL) return -EIO; cifs_sb = CIFS_SB(sb); tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); pTcon = tlink_tcon(tlink); xid = get_xid(); full_path = build_path_from_dentry(direntry); if (full_path == NULL) { rc = -ENOMEM; goto set_ea_exit; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ /* if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ if (value_size > MAX_EA_VALUE_SIZE) { cFYI(1, "size of EA value too large"); rc = -EOPNOTSUPP; goto set_ea_exit; } if (ea_name == NULL) { cFYI(1, "Null xattr names not supported"); } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) == 0) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto set_ea_exit; if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) cFYI(1, "attempt to set cifs inode metadata"); ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value, (__u16)value_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto set_ea_exit; ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */ rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value, (__u16)value_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL, strlen(CIFS_XATTR_CIFS_ACL)) == 0) { #ifdef CONFIG_CIFS_ACL struct cifs_ntsd *pacl; pacl = kmalloc(value_size, GFP_KERNEL); if (!pacl) { cFYI(1, "%s: Can't allocate memory for ACL", __func__); rc = -ENOMEM; } else { memcpy(pacl, ea_value, value_size); rc = set_cifs_acl(pacl, value_size, direntry->d_inode, full_path, CIFS_ACL_DACL); if (rc == 0) /* force revalidate of the inode */ CIFS_I(direntry->d_inode)->time = 0; kfree(pacl); } #else cFYI(1, "Set CIFS ACL not supported yet"); #endif /* CONFIG_CIFS_ACL */ } else { int temp; temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, strlen(POSIX_ACL_XATTR_ACCESS)); if (temp == 0) { #ifdef CONFIG_CIFS_POSIX if (sb->s_flags & MS_POSIXACL) rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, ea_value, (const int)value_size, ACL_TYPE_ACCESS, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); cFYI(1, "set POSIX ACL rc %d", rc); #else cFYI(1, "set POSIX ACL not supported"); #endif } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { #ifdef CONFIG_CIFS_POSIX if (sb->s_flags & MS_POSIXACL) rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, ea_value, (const int)value_size, ACL_TYPE_DEFAULT, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); cFYI(1, "set POSIX default ACL rc %d", rc); #else cFYI(1, "set default POSIX ACL not supported"); #endif } else { cFYI(1, "illegal xattr request %s (only user namespace" " supported)", ea_name); /* BB what if no namespace prefix? */ /* Should we just pass them to server, except for system and perhaps security prefixes? */ } } set_ea_exit: kfree(full_path); free_xid(xid); cifs_put_tlink(tlink); #endif return rc; } ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name, void *ea_value, size_t buf_size) { ssize_t rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR unsigned int xid; struct cifs_sb_info *cifs_sb; struct tcon_link *tlink; struct cifs_tcon *pTcon; struct super_block *sb; char *full_path; if (direntry == NULL) return -EIO; if (direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if (sb == NULL) return -EIO; cifs_sb = CIFS_SB(sb); tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); pTcon = tlink_tcon(tlink); xid = get_xid(); full_path = build_path_from_dentry(direntry); if (full_path == NULL) { rc = -ENOMEM; goto get_ea_exit; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ if (ea_name == NULL) { cFYI(1, "Null xattr names not supported"); } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) == 0) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto get_ea_exit; if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) { cFYI(1, "attempt to query cifs inode metadata"); /* revalidate/getattr then populate from inode */ } /* BB add else when above is implemented */ ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */ rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value, buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) { if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) goto get_ea_exit; ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */ rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value, buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS, strlen(POSIX_ACL_XATTR_ACCESS)) == 0) { #ifdef CONFIG_CIFS_POSIX if (sb->s_flags & MS_POSIXACL) rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, ea_value, buf_size, ACL_TYPE_ACCESS, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); #else cFYI(1, "Query POSIX ACL not supported yet"); #endif /* CONFIG_CIFS_POSIX */ } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT, strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) { #ifdef CONFIG_CIFS_POSIX if (sb->s_flags & MS_POSIXACL) rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, ea_value, buf_size, ACL_TYPE_DEFAULT, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); #else cFYI(1, "Query POSIX default ACL not supported yet"); #endif /* CONFIG_CIFS_POSIX */ } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL, strlen(CIFS_XATTR_CIFS_ACL)) == 0) { #ifdef CONFIG_CIFS_ACL u32 acllen; struct cifs_ntsd *pacl; pacl = get_cifs_acl(cifs_sb, direntry->d_inode, full_path, &acllen); if (IS_ERR(pacl)) { rc = PTR_ERR(pacl); cERROR(1, "%s: error %zd getting sec desc", __func__, rc); } else { if (ea_value) { if (acllen > buf_size) acllen = -ERANGE; else memcpy(ea_value, pacl, acllen); } rc = acllen; kfree(pacl); } #else cFYI(1, "Query CIFS ACL not supported yet"); #endif /* CONFIG_CIFS_ACL */ } else if (strncmp(ea_name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) { cFYI(1, "Trusted xattr namespace not supported yet"); } else if (strncmp(ea_name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) { cFYI(1, "Security xattr namespace not supported yet"); } else cFYI(1, "illegal xattr request %s (only user namespace supported)", ea_name); /* We could add an additional check for streams ie if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ if (rc == -EINVAL) rc = -EOPNOTSUPP; get_ea_exit: kfree(full_path); free_xid(xid); cifs_put_tlink(tlink); #endif return rc; } ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size) { ssize_t rc = -EOPNOTSUPP; #ifdef CONFIG_CIFS_XATTR unsigned int xid; struct cifs_sb_info *cifs_sb; struct tcon_link *tlink; struct cifs_tcon *pTcon; struct super_block *sb; char *full_path; if (direntry == NULL) return -EIO; if (direntry->d_inode == NULL) return -EIO; sb = direntry->d_inode->i_sb; if (sb == NULL) return -EIO; cifs_sb = CIFS_SB(sb); if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) return -EOPNOTSUPP; tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) return PTR_ERR(tlink); pTcon = tlink_tcon(tlink); xid = get_xid(); full_path = build_path_from_dentry(direntry); if (full_path == NULL) { rc = -ENOMEM; goto list_ea_exit; } /* return dos attributes as pseudo xattr */ /* return alt name if available as pseudo attr */ /* if proc/fs/cifs/streamstoxattr is set then search server for EAs or streams to returns as xattrs */ rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data, buf_size, cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); list_ea_exit: kfree(full_path); free_xid(xid); cifs_put_tlink(tlink); #endif return rc; }