| /* |
| * Copyright (c) 2001-2002,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_types.h" |
| #include "xfs_bit.h" |
| #include "xfs_inum.h" |
| #include "xfs_ag.h" |
| #include "xfs_dir2.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_dir2_sf.h" |
| #include "xfs_attr_sf.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_btree.h" |
| #include "xfs_acl.h" |
| #include "xfs_attr.h" |
| #include "xfs_vnodeops.h" |
| |
| #include <linux/capability.h> |
| #include <linux/posix_acl_xattr.h> |
| |
| STATIC int xfs_acl_setmode(bhv_vnode_t *, xfs_acl_t *, int *); |
| STATIC void xfs_acl_filter_mode(mode_t, xfs_acl_t *); |
| STATIC void xfs_acl_get_endian(xfs_acl_t *); |
| STATIC int xfs_acl_access(uid_t, gid_t, xfs_acl_t *, mode_t, cred_t *); |
| STATIC int xfs_acl_invalid(xfs_acl_t *); |
| STATIC void xfs_acl_sync_mode(mode_t, xfs_acl_t *); |
| STATIC void xfs_acl_get_attr(bhv_vnode_t *, xfs_acl_t *, int, int, int *); |
| STATIC void xfs_acl_set_attr(bhv_vnode_t *, xfs_acl_t *, int, int *); |
| STATIC int xfs_acl_allow_set(bhv_vnode_t *, int); |
| |
| kmem_zone_t *xfs_acl_zone; |
| |
| |
| /* |
| * Test for existence of access ACL attribute as efficiently as possible. |
| */ |
| int |
| xfs_acl_vhasacl_access( |
| bhv_vnode_t *vp) |
| { |
| int error; |
| |
| xfs_acl_get_attr(vp, NULL, _ACL_TYPE_ACCESS, ATTR_KERNOVAL, &error); |
| return (error == 0); |
| } |
| |
| /* |
| * Test for existence of default ACL attribute as efficiently as possible. |
| */ |
| int |
| xfs_acl_vhasacl_default( |
| bhv_vnode_t *vp) |
| { |
| int error; |
| |
| if (!S_ISDIR(vp->i_mode)) |
| return 0; |
| xfs_acl_get_attr(vp, NULL, _ACL_TYPE_DEFAULT, ATTR_KERNOVAL, &error); |
| return (error == 0); |
| } |
| |
| /* |
| * Convert from extended attribute representation to in-memory for XFS. |
| */ |
| STATIC int |
| posix_acl_xattr_to_xfs( |
| posix_acl_xattr_header *src, |
| size_t size, |
| xfs_acl_t *dest) |
| { |
| posix_acl_xattr_entry *src_entry; |
| xfs_acl_entry_t *dest_entry; |
| int n; |
| |
| if (!src || !dest) |
| return EINVAL; |
| |
| if (size < sizeof(posix_acl_xattr_header)) |
| return EINVAL; |
| |
| if (src->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION)) |
| return EOPNOTSUPP; |
| |
| memset(dest, 0, sizeof(xfs_acl_t)); |
| dest->acl_cnt = posix_acl_xattr_count(size); |
| if (dest->acl_cnt < 0 || dest->acl_cnt > XFS_ACL_MAX_ENTRIES) |
| return EINVAL; |
| |
| /* |
| * acl_set_file(3) may request that we set default ACLs with |
| * zero length -- defend (gracefully) against that here. |
| */ |
| if (!dest->acl_cnt) |
| return 0; |
| |
| src_entry = (posix_acl_xattr_entry *)((char *)src + sizeof(*src)); |
| dest_entry = &dest->acl_entry[0]; |
| |
| for (n = 0; n < dest->acl_cnt; n++, src_entry++, dest_entry++) { |
| dest_entry->ae_perm = le16_to_cpu(src_entry->e_perm); |
| if (_ACL_PERM_INVALID(dest_entry->ae_perm)) |
| return EINVAL; |
| dest_entry->ae_tag = le16_to_cpu(src_entry->e_tag); |
| switch(dest_entry->ae_tag) { |
| case ACL_USER: |
| case ACL_GROUP: |
| dest_entry->ae_id = le32_to_cpu(src_entry->e_id); |
| break; |
| case ACL_USER_OBJ: |
| case ACL_GROUP_OBJ: |
| case ACL_MASK: |
| case ACL_OTHER: |
| dest_entry->ae_id = ACL_UNDEFINED_ID; |
| break; |
| default: |
| return EINVAL; |
| } |
| } |
| if (xfs_acl_invalid(dest)) |
| return EINVAL; |
| |
| return 0; |
| } |
| |
| /* |
| * Comparison function called from xfs_sort(). |
| * Primary key is ae_tag, secondary key is ae_id. |
| */ |
| STATIC int |
| xfs_acl_entry_compare( |
| const void *va, |
| const void *vb) |
| { |
| xfs_acl_entry_t *a = (xfs_acl_entry_t *)va, |
| *b = (xfs_acl_entry_t *)vb; |
| |
| if (a->ae_tag == b->ae_tag) |
| return (a->ae_id - b->ae_id); |
| return (a->ae_tag - b->ae_tag); |
| } |
| |
| /* |
| * Convert from in-memory XFS to extended attribute representation. |
| */ |
| STATIC int |
| posix_acl_xfs_to_xattr( |
| xfs_acl_t *src, |
| posix_acl_xattr_header *dest, |
| size_t size) |
| { |
| int n; |
| size_t new_size = posix_acl_xattr_size(src->acl_cnt); |
| posix_acl_xattr_entry *dest_entry; |
| xfs_acl_entry_t *src_entry; |
| |
| if (size < new_size) |
| return -ERANGE; |
| |
| /* Need to sort src XFS ACL by <ae_tag,ae_id> */ |
| xfs_sort(src->acl_entry, src->acl_cnt, sizeof(src->acl_entry[0]), |
| xfs_acl_entry_compare); |
| |
| dest->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); |
| dest_entry = &dest->a_entries[0]; |
| src_entry = &src->acl_entry[0]; |
| for (n = 0; n < src->acl_cnt; n++, dest_entry++, src_entry++) { |
| dest_entry->e_perm = cpu_to_le16(src_entry->ae_perm); |
| if (_ACL_PERM_INVALID(src_entry->ae_perm)) |
| return -EINVAL; |
| dest_entry->e_tag = cpu_to_le16(src_entry->ae_tag); |
| switch (src_entry->ae_tag) { |
| case ACL_USER: |
| case ACL_GROUP: |
| dest_entry->e_id = cpu_to_le32(src_entry->ae_id); |
| break; |
| case ACL_USER_OBJ: |
| case ACL_GROUP_OBJ: |
| case ACL_MASK: |
| case ACL_OTHER: |
| dest_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| return new_size; |
| } |
| |
| int |
| xfs_acl_vget( |
| bhv_vnode_t *vp, |
| void *acl, |
| size_t size, |
| int kind) |
| { |
| int error; |
| xfs_acl_t *xfs_acl = NULL; |
| posix_acl_xattr_header *ext_acl = acl; |
| int flags = 0; |
| |
| VN_HOLD(vp); |
| if(size) { |
| if (!(_ACL_ALLOC(xfs_acl))) { |
| error = ENOMEM; |
| goto out; |
| } |
| memset(xfs_acl, 0, sizeof(xfs_acl_t)); |
| } else |
| flags = ATTR_KERNOVAL; |
| |
| xfs_acl_get_attr(vp, xfs_acl, kind, flags, &error); |
| if (error) |
| goto out; |
| |
| if (!size) { |
| error = -posix_acl_xattr_size(XFS_ACL_MAX_ENTRIES); |
| } else { |
| if (xfs_acl_invalid(xfs_acl)) { |
| error = EINVAL; |
| goto out; |
| } |
| if (kind == _ACL_TYPE_ACCESS) { |
| bhv_vattr_t va; |
| |
| va.va_mask = XFS_AT_MODE; |
| error = xfs_getattr(xfs_vtoi(vp), &va, 0); |
| if (error) |
| goto out; |
| xfs_acl_sync_mode(va.va_mode, xfs_acl); |
| } |
| error = -posix_acl_xfs_to_xattr(xfs_acl, ext_acl, size); |
| } |
| out: |
| VN_RELE(vp); |
| if(xfs_acl) |
| _ACL_FREE(xfs_acl); |
| return -error; |
| } |
| |
| int |
| xfs_acl_vremove( |
| bhv_vnode_t *vp, |
| int kind) |
| { |
| int error; |
| |
| VN_HOLD(vp); |
| error = xfs_acl_allow_set(vp, kind); |
| if (!error) { |
| error = xfs_attr_remove(xfs_vtoi(vp), |
| kind == _ACL_TYPE_DEFAULT? |
| SGI_ACL_DEFAULT: SGI_ACL_FILE, |
| ATTR_ROOT); |
| if (error == ENOATTR) |
| error = 0; /* 'scool */ |
| } |
| VN_RELE(vp); |
| return -error; |
| } |
| |
| int |
| xfs_acl_vset( |
| bhv_vnode_t *vp, |
| void *acl, |
| size_t size, |
| int kind) |
| { |
| posix_acl_xattr_header *ext_acl = acl; |
| xfs_acl_t *xfs_acl; |
| int error; |
| int basicperms = 0; /* more than std unix perms? */ |
| |
| if (!acl) |
| return -EINVAL; |
| |
| if (!(_ACL_ALLOC(xfs_acl))) |
| return -ENOMEM; |
| |
| error = posix_acl_xattr_to_xfs(ext_acl, size, xfs_acl); |
| if (error) { |
| _ACL_FREE(xfs_acl); |
| return -error; |
| } |
| if (!xfs_acl->acl_cnt) { |
| _ACL_FREE(xfs_acl); |
| return 0; |
| } |
| |
| VN_HOLD(vp); |
| error = xfs_acl_allow_set(vp, kind); |
| |
| /* Incoming ACL exists, set file mode based on its value */ |
| if (!error && kind == _ACL_TYPE_ACCESS) |
| error = xfs_acl_setmode(vp, xfs_acl, &basicperms); |
| |
| if (error) |
| goto out; |
| |
| /* |
| * If we have more than std unix permissions, set up the actual attr. |
| * Otherwise, delete any existing attr. This prevents us from |
| * having actual attrs for permissions that can be stored in the |
| * standard permission bits. |
| */ |
| if (!basicperms) { |
| xfs_acl_set_attr(vp, xfs_acl, kind, &error); |
| } else { |
| error = -xfs_acl_vremove(vp, _ACL_TYPE_ACCESS); |
| } |
| |
| out: |
| VN_RELE(vp); |
| _ACL_FREE(xfs_acl); |
| return -error; |
| } |
| |
| int |
| xfs_acl_iaccess( |
| xfs_inode_t *ip, |
| mode_t mode, |
| cred_t *cr) |
| { |
| xfs_acl_t *acl; |
| int rval; |
| |
| if (!(_ACL_ALLOC(acl))) |
| return -1; |
| |
| /* If the file has no ACL return -1. */ |
| rval = sizeof(xfs_acl_t); |
| if (xfs_attr_fetch(ip, SGI_ACL_FILE, SGI_ACL_FILE_SIZE, |
| (char *)acl, &rval, ATTR_ROOT | ATTR_KERNACCESS, cr)) { |
| _ACL_FREE(acl); |
| return -1; |
| } |
| xfs_acl_get_endian(acl); |
| |
| /* If the file has an empty ACL return -1. */ |
| if (acl->acl_cnt == XFS_ACL_NOT_PRESENT) { |
| _ACL_FREE(acl); |
| return -1; |
| } |
| |
| /* Synchronize ACL with mode bits */ |
| xfs_acl_sync_mode(ip->i_d.di_mode, acl); |
| |
| rval = xfs_acl_access(ip->i_d.di_uid, ip->i_d.di_gid, acl, mode, cr); |
| _ACL_FREE(acl); |
| return rval; |
| } |
| |
| STATIC int |
| xfs_acl_allow_set( |
| bhv_vnode_t *vp, |
| int kind) |
| { |
| xfs_inode_t *ip = xfs_vtoi(vp); |
| bhv_vattr_t va; |
| int error; |
| |
| if (vp->i_flags & (S_IMMUTABLE|S_APPEND)) |
| return EPERM; |
| if (kind == _ACL_TYPE_DEFAULT && !S_ISDIR(vp->i_mode)) |
| return ENOTDIR; |
| if (vp->i_sb->s_flags & MS_RDONLY) |
| return EROFS; |
| va.va_mask = XFS_AT_UID; |
| error = xfs_getattr(ip, &va, 0); |
| if (error) |
| return error; |
| if (va.va_uid != current->fsuid && !capable(CAP_FOWNER)) |
| return EPERM; |
| return error; |
| } |
| |
| /* |
| * Note: cr is only used here for the capability check if the ACL test fails. |
| * It is not used to find out the credentials uid or groups etc, as was |
| * done in IRIX. It is assumed that the uid and groups for the current |
| * thread are taken from "current" instead of the cr parameter. |
| */ |
| STATIC int |
| xfs_acl_access( |
| uid_t fuid, |
| gid_t fgid, |
| xfs_acl_t *fap, |
| mode_t md, |
| cred_t *cr) |
| { |
| xfs_acl_entry_t matched; |
| int i, allows; |
| int maskallows = -1; /* true, but not 1, either */ |
| int seen_userobj = 0; |
| |
| matched.ae_tag = 0; /* Invalid type */ |
| matched.ae_perm = 0; |
| |
| for (i = 0; i < fap->acl_cnt; i++) { |
| /* |
| * Break out if we've got a user_obj entry or |
| * a user entry and the mask (and have processed USER_OBJ) |
| */ |
| if (matched.ae_tag == ACL_USER_OBJ) |
| break; |
| if (matched.ae_tag == ACL_USER) { |
| if (maskallows != -1 && seen_userobj) |
| break; |
| if (fap->acl_entry[i].ae_tag != ACL_MASK && |
| fap->acl_entry[i].ae_tag != ACL_USER_OBJ) |
| continue; |
| } |
| /* True if this entry allows the requested access */ |
| allows = ((fap->acl_entry[i].ae_perm & md) == md); |
| |
| switch (fap->acl_entry[i].ae_tag) { |
| case ACL_USER_OBJ: |
| seen_userobj = 1; |
| if (fuid != current->fsuid) |
| continue; |
| matched.ae_tag = ACL_USER_OBJ; |
| matched.ae_perm = allows; |
| break; |
| case ACL_USER: |
| if (fap->acl_entry[i].ae_id != current->fsuid) |
| continue; |
| matched.ae_tag = ACL_USER; |
| matched.ae_perm = allows; |
| break; |
| case ACL_GROUP_OBJ: |
| if ((matched.ae_tag == ACL_GROUP_OBJ || |
| matched.ae_tag == ACL_GROUP) && !allows) |
| continue; |
| if (!in_group_p(fgid)) |
| continue; |
| matched.ae_tag = ACL_GROUP_OBJ; |
| matched.ae_perm = allows; |
| break; |
| case ACL_GROUP: |
| if ((matched.ae_tag == ACL_GROUP_OBJ || |
| matched.ae_tag == ACL_GROUP) && !allows) |
| continue; |
| if (!in_group_p(fap->acl_entry[i].ae_id)) |
| continue; |
| matched.ae_tag = ACL_GROUP; |
| matched.ae_perm = allows; |
| break; |
| case ACL_MASK: |
| maskallows = allows; |
| break; |
| case ACL_OTHER: |
| if (matched.ae_tag != 0) |
| continue; |
| matched.ae_tag = ACL_OTHER; |
| matched.ae_perm = allows; |
| break; |
| } |
| } |
| /* |
| * First possibility is that no matched entry allows access. |
| * The capability to override DAC may exist, so check for it. |
| */ |
| switch (matched.ae_tag) { |
| case ACL_OTHER: |
| case ACL_USER_OBJ: |
| if (matched.ae_perm) |
| return 0; |
| break; |
| case ACL_USER: |
| case ACL_GROUP_OBJ: |
| case ACL_GROUP: |
| if (maskallows && matched.ae_perm) |
| return 0; |
| break; |
| case 0: |
| break; |
| } |
| |
| /* EACCES tells generic_permission to check for capability overrides */ |
| return EACCES; |
| } |
| |
| /* |
| * ACL validity checker. |
| * This acl validation routine checks each ACL entry read in makes sense. |
| */ |
| STATIC int |
| xfs_acl_invalid( |
| xfs_acl_t *aclp) |
| { |
| xfs_acl_entry_t *entry, *e; |
| int user = 0, group = 0, other = 0, mask = 0; |
| int mask_required = 0; |
| int i, j; |
| |
| if (!aclp) |
| goto acl_invalid; |
| |
| if (aclp->acl_cnt > XFS_ACL_MAX_ENTRIES) |
| goto acl_invalid; |
| |
| for (i = 0; i < aclp->acl_cnt; i++) { |
| entry = &aclp->acl_entry[i]; |
| switch (entry->ae_tag) { |
| case ACL_USER_OBJ: |
| if (user++) |
| goto acl_invalid; |
| break; |
| case ACL_GROUP_OBJ: |
| if (group++) |
| goto acl_invalid; |
| break; |
| case ACL_OTHER: |
| if (other++) |
| goto acl_invalid; |
| break; |
| case ACL_USER: |
| case ACL_GROUP: |
| for (j = i + 1; j < aclp->acl_cnt; j++) { |
| e = &aclp->acl_entry[j]; |
| if (e->ae_id == entry->ae_id && |
| e->ae_tag == entry->ae_tag) |
| goto acl_invalid; |
| } |
| mask_required++; |
| break; |
| case ACL_MASK: |
| if (mask++) |
| goto acl_invalid; |
| break; |
| default: |
| goto acl_invalid; |
| } |
| } |
| if (!user || !group || !other || (mask_required && !mask)) |
| goto acl_invalid; |
| else |
| return 0; |
| acl_invalid: |
| return EINVAL; |
| } |
| |
| /* |
| * Do ACL endian conversion. |
| */ |
| STATIC void |
| xfs_acl_get_endian( |
| xfs_acl_t *aclp) |
| { |
| xfs_acl_entry_t *ace, *end; |
| |
| INT_SET(aclp->acl_cnt, ARCH_CONVERT, aclp->acl_cnt); |
| end = &aclp->acl_entry[0]+aclp->acl_cnt; |
| for (ace = &aclp->acl_entry[0]; ace < end; ace++) { |
| INT_SET(ace->ae_tag, ARCH_CONVERT, ace->ae_tag); |
| INT_SET(ace->ae_id, ARCH_CONVERT, ace->ae_id); |
| INT_SET(ace->ae_perm, ARCH_CONVERT, ace->ae_perm); |
| } |
| } |
| |
| /* |
| * Get the ACL from the EA and do endian conversion. |
| */ |
| STATIC void |
| xfs_acl_get_attr( |
| bhv_vnode_t *vp, |
| xfs_acl_t *aclp, |
| int kind, |
| int flags, |
| int *error) |
| { |
| int len = sizeof(xfs_acl_t); |
| |
| ASSERT((flags & ATTR_KERNOVAL) ? (aclp == NULL) : 1); |
| flags |= ATTR_ROOT; |
| *error = xfs_attr_get(xfs_vtoi(vp), |
| kind == _ACL_TYPE_ACCESS ? |
| SGI_ACL_FILE : SGI_ACL_DEFAULT, |
| (char *)aclp, &len, flags, sys_cred); |
| if (*error || (flags & ATTR_KERNOVAL)) |
| return; |
| xfs_acl_get_endian(aclp); |
| } |
| |
| /* |
| * Set the EA with the ACL and do endian conversion. |
| */ |
| STATIC void |
| xfs_acl_set_attr( |
| bhv_vnode_t *vp, |
| xfs_acl_t *aclp, |
| int kind, |
| int *error) |
| { |
| xfs_acl_entry_t *ace, *newace, *end; |
| xfs_acl_t *newacl; |
| int len; |
| |
| if (!(_ACL_ALLOC(newacl))) { |
| *error = ENOMEM; |
| return; |
| } |
| |
| len = sizeof(xfs_acl_t) - |
| (sizeof(xfs_acl_entry_t) * (XFS_ACL_MAX_ENTRIES - aclp->acl_cnt)); |
| end = &aclp->acl_entry[0]+aclp->acl_cnt; |
| for (ace = &aclp->acl_entry[0], newace = &newacl->acl_entry[0]; |
| ace < end; |
| ace++, newace++) { |
| INT_SET(newace->ae_tag, ARCH_CONVERT, ace->ae_tag); |
| INT_SET(newace->ae_id, ARCH_CONVERT, ace->ae_id); |
| INT_SET(newace->ae_perm, ARCH_CONVERT, ace->ae_perm); |
| } |
| INT_SET(newacl->acl_cnt, ARCH_CONVERT, aclp->acl_cnt); |
| *error = xfs_attr_set(xfs_vtoi(vp), |
| kind == _ACL_TYPE_ACCESS ? |
| SGI_ACL_FILE: SGI_ACL_DEFAULT, |
| (char *)newacl, len, ATTR_ROOT); |
| _ACL_FREE(newacl); |
| } |
| |
| int |
| xfs_acl_vtoacl( |
| bhv_vnode_t *vp, |
| xfs_acl_t *access_acl, |
| xfs_acl_t *default_acl) |
| { |
| bhv_vattr_t va; |
| int error = 0; |
| |
| if (access_acl) { |
| /* |
| * Get the Access ACL and the mode. If either cannot |
| * be obtained for some reason, invalidate the access ACL. |
| */ |
| xfs_acl_get_attr(vp, access_acl, _ACL_TYPE_ACCESS, 0, &error); |
| if (!error) { |
| /* Got the ACL, need the mode... */ |
| va.va_mask = XFS_AT_MODE; |
| error = xfs_getattr(xfs_vtoi(vp), &va, 0); |
| } |
| |
| if (error) |
| access_acl->acl_cnt = XFS_ACL_NOT_PRESENT; |
| else /* We have a good ACL and the file mode, synchronize. */ |
| xfs_acl_sync_mode(va.va_mode, access_acl); |
| } |
| |
| if (default_acl) { |
| xfs_acl_get_attr(vp, default_acl, _ACL_TYPE_DEFAULT, 0, &error); |
| if (error) |
| default_acl->acl_cnt = XFS_ACL_NOT_PRESENT; |
| } |
| return error; |
| } |
| |
| /* |
| * This function retrieves the parent directory's acl, processes it |
| * and lets the child inherit the acl(s) that it should. |
| */ |
| int |
| xfs_acl_inherit( |
| bhv_vnode_t *vp, |
| mode_t mode, |
| xfs_acl_t *pdaclp) |
| { |
| xfs_acl_t *cacl; |
| int error = 0; |
| int basicperms = 0; |
| |
| /* |
| * If the parent does not have a default ACL, or it's an |
| * invalid ACL, we're done. |
| */ |
| if (!vp) |
| return 0; |
| if (!pdaclp || xfs_acl_invalid(pdaclp)) |
| return 0; |
| |
| /* |
| * Copy the default ACL of the containing directory to |
| * the access ACL of the new file and use the mode that |
| * was passed in to set up the correct initial values for |
| * the u::,g::[m::], and o:: entries. This is what makes |
| * umask() "work" with ACL's. |
| */ |
| |
| if (!(_ACL_ALLOC(cacl))) |
| return ENOMEM; |
| |
| memcpy(cacl, pdaclp, sizeof(xfs_acl_t)); |
| xfs_acl_filter_mode(mode, cacl); |
| error = xfs_acl_setmode(vp, cacl, &basicperms); |
| if (error) |
| goto out_error; |
| |
| /* |
| * Set the Default and Access ACL on the file. The mode is already |
| * set on the file, so we don't need to worry about that. |
| * |
| * If the new file is a directory, its default ACL is a copy of |
| * the containing directory's default ACL. |
| */ |
| if (S_ISDIR(vp->i_mode)) |
| xfs_acl_set_attr(vp, pdaclp, _ACL_TYPE_DEFAULT, &error); |
| if (!error && !basicperms) |
| xfs_acl_set_attr(vp, cacl, _ACL_TYPE_ACCESS, &error); |
| out_error: |
| _ACL_FREE(cacl); |
| return error; |
| } |
| |
| /* |
| * Set up the correct mode on the file based on the supplied ACL. This |
| * makes sure that the mode on the file reflects the state of the |
| * u::,g::[m::], and o:: entries in the ACL. Since the mode is where |
| * the ACL is going to get the permissions for these entries, we must |
| * synchronize the mode whenever we set the ACL on a file. |
| */ |
| STATIC int |
| xfs_acl_setmode( |
| bhv_vnode_t *vp, |
| xfs_acl_t *acl, |
| int *basicperms) |
| { |
| bhv_vattr_t va; |
| xfs_acl_entry_t *ap; |
| xfs_acl_entry_t *gap = NULL; |
| int i, error, nomask = 1; |
| |
| *basicperms = 1; |
| |
| if (acl->acl_cnt == XFS_ACL_NOT_PRESENT) |
| return 0; |
| |
| /* |
| * Copy the u::, g::, o::, and m:: bits from the ACL into the |
| * mode. The m:: bits take precedence over the g:: bits. |
| */ |
| va.va_mask = XFS_AT_MODE; |
| error = xfs_getattr(xfs_vtoi(vp), &va, 0); |
| if (error) |
| return error; |
| |
| va.va_mask = XFS_AT_MODE; |
| va.va_mode &= ~(S_IRWXU|S_IRWXG|S_IRWXO); |
| ap = acl->acl_entry; |
| for (i = 0; i < acl->acl_cnt; ++i) { |
| switch (ap->ae_tag) { |
| case ACL_USER_OBJ: |
| va.va_mode |= ap->ae_perm << 6; |
| break; |
| case ACL_GROUP_OBJ: |
| gap = ap; |
| break; |
| case ACL_MASK: /* more than just standard modes */ |
| nomask = 0; |
| va.va_mode |= ap->ae_perm << 3; |
| *basicperms = 0; |
| break; |
| case ACL_OTHER: |
| va.va_mode |= ap->ae_perm; |
| break; |
| default: /* more than just standard modes */ |
| *basicperms = 0; |
| break; |
| } |
| ap++; |
| } |
| |
| /* Set the group bits from ACL_GROUP_OBJ if there's no ACL_MASK */ |
| if (gap && nomask) |
| va.va_mode |= gap->ae_perm << 3; |
| |
| return xfs_setattr(xfs_vtoi(vp), &va, 0, sys_cred); |
| } |
| |
| /* |
| * The permissions for the special ACL entries (u::, g::[m::], o::) are |
| * actually stored in the file mode (if there is both a group and a mask, |
| * the group is stored in the ACL entry and the mask is stored on the file). |
| * This allows the mode to remain automatically in sync with the ACL without |
| * the need for a call-back to the ACL system at every point where the mode |
| * could change. This function takes the permissions from the specified mode |
| * and places it in the supplied ACL. |
| * |
| * This implementation draws its validity from the fact that, when the ACL |
| * was assigned, the mode was copied from the ACL. |
| * If the mode did not change, therefore, the mode remains exactly what was |
| * taken from the special ACL entries at assignment. |
| * If a subsequent chmod() was done, the POSIX spec says that the change in |
| * mode must cause an update to the ACL seen at user level and used for |
| * access checks. Before and after a mode change, therefore, the file mode |
| * most accurately reflects what the special ACL entries should permit/deny. |
| * |
| * CAVEAT: If someone sets the SGI_ACL_FILE attribute directly, |
| * the existing mode bits will override whatever is in the |
| * ACL. Similarly, if there is a pre-existing ACL that was |
| * never in sync with its mode (owing to a bug in 6.5 and |
| * before), it will now magically (or mystically) be |
| * synchronized. This could cause slight astonishment, but |
| * it is better than inconsistent permissions. |
| * |
| * The supplied ACL is a template that may contain any combination |
| * of special entries. These are treated as place holders when we fill |
| * out the ACL. This routine does not add or remove special entries, it |
| * simply unites each special entry with its associated set of permissions. |
| */ |
| STATIC void |
| xfs_acl_sync_mode( |
| mode_t mode, |
| xfs_acl_t *acl) |
| { |
| int i, nomask = 1; |
| xfs_acl_entry_t *ap; |
| xfs_acl_entry_t *gap = NULL; |
| |
| /* |
| * Set ACL entries. POSIX1003.1eD16 requires that the MASK |
| * be set instead of the GROUP entry, if there is a MASK. |
| */ |
| for (ap = acl->acl_entry, i = 0; i < acl->acl_cnt; ap++, i++) { |
| switch (ap->ae_tag) { |
| case ACL_USER_OBJ: |
| ap->ae_perm = (mode >> 6) & 0x7; |
| break; |
| case ACL_GROUP_OBJ: |
| gap = ap; |
| break; |
| case ACL_MASK: |
| nomask = 0; |
| ap->ae_perm = (mode >> 3) & 0x7; |
| break; |
| case ACL_OTHER: |
| ap->ae_perm = mode & 0x7; |
| break; |
| default: |
| break; |
| } |
| } |
| /* Set the ACL_GROUP_OBJ if there's no ACL_MASK */ |
| if (gap && nomask) |
| gap->ae_perm = (mode >> 3) & 0x7; |
| } |
| |
| /* |
| * When inheriting an Access ACL from a directory Default ACL, |
| * the ACL bits are set to the intersection of the ACL default |
| * permission bits and the file permission bits in mode. If there |
| * are no permission bits on the file then we must not give them |
| * the ACL. This is what what makes umask() work with ACLs. |
| */ |
| STATIC void |
| xfs_acl_filter_mode( |
| mode_t mode, |
| xfs_acl_t *acl) |
| { |
| int i, nomask = 1; |
| xfs_acl_entry_t *ap; |
| xfs_acl_entry_t *gap = NULL; |
| |
| /* |
| * Set ACL entries. POSIX1003.1eD16 requires that the MASK |
| * be merged with GROUP entry, if there is a MASK. |
| */ |
| for (ap = acl->acl_entry, i = 0; i < acl->acl_cnt; ap++, i++) { |
| switch (ap->ae_tag) { |
| case ACL_USER_OBJ: |
| ap->ae_perm &= (mode >> 6) & 0x7; |
| break; |
| case ACL_GROUP_OBJ: |
| gap = ap; |
| break; |
| case ACL_MASK: |
| nomask = 0; |
| ap->ae_perm &= (mode >> 3) & 0x7; |
| break; |
| case ACL_OTHER: |
| ap->ae_perm &= mode & 0x7; |
| break; |
| default: |
| break; |
| } |
| } |
| /* Set the ACL_GROUP_OBJ if there's no ACL_MASK */ |
| if (gap && nomask) |
| gap->ae_perm &= (mode >> 3) & 0x7; |
| } |