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Groups > linux.kernel > #1248844 > unrolled thread
| Started by | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| First post | 2015-10-16 17:20 +0200 |
| Last post | 2015-10-16 18:10 +0200 |
| Articles | 12 on this page of 52 — 4 participants |
Back to article view | Back to linux.kernel
[PATCH v11 00/48] Richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 10/48] vfs: Cache base_acl objects in inodes Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 04/48] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 11/48] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 05/48] vfs: Add permission flags for setting file attributes Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 06/48] richacl: In-memory representation and helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 01/48] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 03/48] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:20 +0200
[PATCH v11 41/48] xfs: Don't allow unmapped identifiers in richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 39/48] nfsd: Add support for unmapped richace identifiers Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 25/48] richacl: acl editing helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 22/48] xfs: Fix error path in xfs_get_acl Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 46/48] nfs: Distinguish missing users and groups from nobody Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 42/48] sunrpc: Allow to demand-allocate pages to encode into Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 31/48] richacl: Apply the file masks to a richacl Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 29/48] richacl: Set the other permissions to the other mask Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 38/48] richacl: Add support for unmapped identifiers Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 48/48] nfs: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 24/48] xfs: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 45/48] nfs: Remove unused xdr page offsets in getacl/setacl arguments Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 47/48] nfs: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 12/48] vfs: Cache richacl in struct inode Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 19/48] vfs: Add richacl permission checking Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 23/48] xfs: Make xfs_set_mode non-static Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 21/48] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
Re: [PATCH v11 21/48] ext4: Add richacl feature flag Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-16 19:40 +0200
Re: [PATCH v11 21/48] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 19:50 +0200
Re: [PATCH v11 21/48] ext4: Add richacl feature flag Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-10-16 20:30 +0200
Re: [PATCH v11 21/48] ext4: Add richacl feature flag Dave Chinner <david@fromorbit.com> - 2015-10-18 01:30 +0200
[PATCH v11 44/48] nfs: Fix GETATTR bitmap verification Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 37/48] nfsd: Add support for the MAY_CREATE_{FILE,DIR} permissions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 16/48] richacl: Automatic Inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
Re: [PATCH v11 16/48] richacl: Automatic Inheritance Andy Lutomirski <luto@amacapital.net> - 2015-10-16 18:10 +0200
Re: [PATCH v11 16/48] richacl: Automatic Inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 18:20 +0200
[PATCH v11 18/48] richacl: Add richacl xattr handler Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 43/48] sunrpc: Add xdr_init_encode_pages Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 28/48] richacl: Set the owner permissions to the owner mask Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 36/48] nfsd: Add support for the v4.1 dacl attribute Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 35/48] nfsd: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 13/48] richacl: Update the file masks in chmod() Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 30/48] richacl: Isolate the owner and group classes Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 20/48] ext4: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 27/48] richacl: Propagate everyone@ permissions to other aces Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:30 +0200
[PATCH v11 40/48] ext4: Don't allow unmapped identifiers in richacls Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:40 +0200
[PATCH v11 26/48] richacl: Move everyone@ aces down the acl Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:50 +0200
[PATCH v11 33/48] nfsd: Keep list of acls to dispose of in compoundargs Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:50 +0200
[PATCH v11 32/48] richacl: Create richacl from mode values Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:50 +0200
[PATCH v11 34/48] nfsd: Use richacls as internal acl representation Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 17:50 +0200
[PATCH v11 15/48] richacl: Create-time inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 18:00 +0200
[PATCH v11 17/48] richacl: xattr mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 18:00 +0200
[PATCH v11 14/48] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 18:10 +0200
[PATCH v11 09/48] richacl: Permission check algorithm Andreas Gruenbacher <agruenba@redhat.com> - 2015-10-16 18:10 +0200
Page 3 of 3 — ← Prev page 1 2 [3]
| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:30 +0200 |
| Subject | [PATCH v11 30/48] richacl: Isolate the owner and group classes |
| Message-ID | <qkf7e-1SN-83@gated-at.bofh.it> |
| In reply to | #1248844 |
When applying the file masks to an acl, we need to ensure that no
process gets more permissions than allowed by its file mask.
This may require inserting an owner@ deny ace to ensure this if the
owner mask contains fewer permissions than the group or other mask. For
example, when applying mode 0446 to the following acl:
everyone@:rw::allow
A deny ace needs to be inserted so that the owner won't get elevated
write access:
owner@:w::deny
everyone@:rw::allow
Likewise, we may need to insert group class deny aces if the group mask
contains fewer permissions than the other mask. For example, when
applying mode 0646 to the following acl:
owner@:rw::allow
everyone@:rw::allow
A deny ace needs to be inserted so that the owning group won't get
elevated write access:
owner@:rw::allow
group@:w::deny
everyone@:rw::allow
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_compat.c | 223 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 223 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 21ee31e..7e25343 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -503,3 +503,226 @@ richacl_set_other_permissions(struct richacl_alloc *alloc, unsigned int *added)
}
return 0;
}
+
+/**
+ * richacl_max_allowed - maximum permissions that anybody is allowed
+ */
+static unsigned int
+richacl_max_allowed(struct richacl *acl)
+{
+ struct richace *ace;
+ unsigned int allowed = 0;
+
+ richacl_for_each_entry_reverse(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_allow(ace))
+ allowed |= ace->e_mask;
+ else if (richace_is_deny(ace)) {
+ if (richace_is_everyone(ace))
+ allowed &= ~ace->e_mask;
+ }
+ }
+ return allowed;
+}
+
+/**
+ * richacl_isolate_owner_class - limit the owner class to the owner file mask
+ * @alloc: acl and number of allocated entries
+ *
+ * POSIX requires that after a chmod, the owner class is granted no more
+ * permissions than the owner file permission bits. For richacls, this
+ * means that the owner class must not be granted any permissions that the
+ * owner mask does not include.
+ *
+ * When we apply file masks to an acl which grant more permissions to the group
+ * or other class than to the owner class, we may end up in a situation where
+ * the owner is granted additional permissions from other aces. For example,
+ * given this acl:
+ *
+ * everyone@:rwx::allow
+ *
+ * when file masks corresponding to mode 0406 are applied, after
+ * richacl_propagate_everyone() and __richacl_apply_masks(), we end up with:
+ *
+ * owner@:r::allow
+ * everyone@:rw::allow
+ *
+ * This acl still grants the owner rw access through the everyone@ allow ace.
+ * To fix this, we must deny the owner w access:
+ *
+ * owner@:w::deny
+ * owner@:r::allow
+ * everyone@:rw::allow
+ */
+static int
+richacl_isolate_owner_class(struct richacl_alloc *alloc)
+{
+ struct richacl *acl = alloc->acl;
+ struct richace *ace;
+ unsigned int deny;
+
+ deny = richacl_max_allowed(acl) & ~acl->a_owner_mask;
+ if (!deny)
+ return 0;
+
+ /*
+ * Figure out if we can update an existig OWNER@ DENY entry.
+ */
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_allow(ace))
+ break;
+ if (richace_is_owner(ace))
+ return richace_change_mask(alloc, &ace,
+ ace->e_mask | deny);
+ }
+
+ /* Insert an owner@ deny entry at the front. */
+ ace = acl->a_entries;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = deny;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ return 0;
+}
+
+/**
+ * __richacl_isolate_who - isolate entry from everyone@ allow entry
+ * @alloc: acl and number of allocated entries
+ * @who: identifier to isolate
+ * @deny: permissions this identifier should not be allowed
+ *
+ * See richacl_isolate_group_class().
+ */
+static int
+__richacl_isolate_who(struct richacl_alloc *alloc, struct richace *who,
+ unsigned int deny)
+{
+ struct richacl *acl = alloc->acl;
+ struct richace *ace, who_copy;
+ int n;
+
+ /*
+ * Compute the permissions already defined for @who. There are no
+ * everyone@ deny aces left in the acl at this stage.
+ */
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_same_identifier(ace, who))
+ deny &= ~ace->e_mask;
+ }
+ if (!deny)
+ return 0;
+
+ /*
+ * Figure out if we can update an existig deny entry. Start from the
+ * entry before the trailing everyone@ allow entry. We will not hit
+ * everyone@ entries in the loop.
+ */
+ for (n = acl->a_count - 2; n != -1; n--) {
+ ace = acl->a_entries + n;
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_deny(ace)) {
+ if (richace_is_same_identifier(ace, who))
+ return richace_change_mask(alloc, &ace,
+ ace->e_mask | deny);
+ } else if (richace_is_allow(ace) &&
+ (ace->e_mask & deny))
+ break;
+ }
+
+ /*
+ * Insert a new entry before the trailing everyone@ deny entry.
+ */
+ richace_copy(&who_copy, who);
+ ace = acl->a_entries + acl->a_count - 1;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ richace_copy(ace, &who_copy);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags &= ~RICHACE_INHERITANCE_FLAGS;
+ ace->e_mask = deny;
+ return 0;
+}
+
+/**
+ * richacl_isolate_group_class - limit the group class to the group file mask
+ * @alloc: acl and number of allocated entries
+ * @deny: additional permissions to deny
+ *
+ * POSIX requires that after a chmod, the group class is granted no more
+ * permissions than the group file permission bits. For richacls, this
+ * means that the group class must not be granted any permissions that the
+ * group mask does not include.
+ *
+ * When we apply file masks to an acl which grant more permissions to the other
+ * class than to the group class, we may end up in a situation where processes
+ * in the group class are granted additional permission from other aces. For
+ * example, given this acl:
+ *
+ * joe:rwx::allow
+ * everyone@:rwx::allow
+ *
+ * when file masks corresponding to mode 0646 are applied, after
+ * richacl_propagate_everyone() and __richacl_apply_masks(), we end up with:
+ *
+ * joe:r::allow
+ * owner@:rw::allow
+ * group@:r::allow
+ * everyone@:rw::allow
+ *
+ * This acl still grants joe and group@ rw access through the everyone@ allow
+ * ace. To fix this, we must deny w access to group class aces before the
+ * everyone@ allow ace at the end of the acl:
+ *
+ * joe:r::allow
+ * owner@:rw::allow
+ * group@:r::allow
+ * joe:w::deny
+ * group@:w::deny
+ * everyone@:rw::allow
+ */
+static int
+richacl_isolate_group_class(struct richacl_alloc *alloc, unsigned int deny)
+{
+ struct richace who = {
+ .e_flags = RICHACE_SPECIAL_WHO,
+ .e_id.special = RICHACE_GROUP_SPECIAL_ID,
+ };
+ struct richace *ace;
+
+ if (!alloc->acl->a_count)
+ return 0;
+ ace = alloc->acl->a_entries + alloc->acl->a_count - 1;
+ if (richace_is_inherit_only(ace) || !richace_is_everyone(ace))
+ return 0;
+ deny |= ace->e_mask & ~alloc->acl->a_group_mask;
+
+ if (deny) {
+ unsigned int n;
+
+ if (__richacl_isolate_who(alloc, &who, deny))
+ return -1;
+ /*
+ * Start from the entry before the trailing everyone@ allow
+ * entry. We will not hit everyone@ entries in the loop.
+ */
+ for (n = alloc->acl->a_count - 2; n != -1; n--) {
+ ace = alloc->acl->a_entries + n;
+
+ if (richace_is_inherit_only(ace) ||
+ richace_is_owner(ace) ||
+ richace_is_group(ace))
+ continue;
+ if (__richacl_isolate_who(alloc, ace, deny))
+ return -1;
+ }
+ }
+ return 0;
+}
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:30 +0200 |
| Subject | [PATCH v11 20/48] ext4: Add richacl support |
| Message-ID | <qkf7e-1SN-85@gated-at.bofh.it> |
| In reply to | #1248844 |
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Support the richacl permission model in ext4. The richacls are stored
in "system.richacl" xattrs. Richacls need to be enabled by tune2fs or
at file system create time.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/ext4/Kconfig | 11 +++++
fs/ext4/Makefile | 1 +
fs/ext4/file.c | 3 ++
fs/ext4/ialloc.c | 11 ++++-
fs/ext4/inode.c | 12 ++++-
fs/ext4/namei.c | 5 ++
fs/ext4/richacl.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4/richacl.h | 40 ++++++++++++++++
fs/ext4/xattr.c | 7 +++
9 files changed, 228 insertions(+), 3 deletions(-)
create mode 100644 fs/ext4/richacl.c
create mode 100644 fs/ext4/richacl.h
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index 47728da..3ec0843 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -22,6 +22,17 @@ config EXT3_FS_POSIX_ACL
This config option is here only for backward compatibility. ext3
filesystem is now handled by the ext4 driver.
+config EXT4_FS_RICHACL
+ bool "Ext4 Rich Access Control Lists (EXPERIMENTAL)"
+ depends on EXT4_FS
+ select FS_RICHACL
+ help
+ Richacls are an implementation of NFSv4 ACLs, extended by file masks
+ to cleanly integrate into the POSIX file permission model. To learn
+ more about them, see http://www.bestbits.at/richacl/.
+
+ If you don't know what Richacls are, say N.
+
config EXT3_FS_SECURITY
bool "Ext3 Security Labels"
depends on EXT3_FS
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index 75285ea..ea0d539 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -14,3 +14,4 @@ ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \
crypto_key.o crypto_fname.o
+ext4-$(CONFIG_EXT4_FS_RICHACL) += richacl.o
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 113837e..a03b4a5 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -30,6 +30,7 @@
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
/*
* Called when an inode is released. Note that this is different
@@ -719,6 +720,8 @@ const struct inode_operations ext4_file_inode_operations = {
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
+ .get_richacl = ext4_get_richacl,
+ .set_richacl = ext4_set_richacl,
.fiemap = ext4_fiemap,
};
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 619bfc1..9657b3a 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -27,6 +27,7 @@
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
@@ -697,6 +698,14 @@ out:
return ret;
}
+static inline int
+ext4_new_acl(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+ if (IS_RICHACL(dir))
+ return ext4_init_richacl(handle, inode, dir);
+ return ext4_init_acl(handle, inode, dir);
+}
+
/*
* There are two policies for allocating an inode. If the new inode is
* a directory, then a forward search is made for a block group with both
@@ -1052,7 +1061,7 @@ got:
if (err)
goto fail_drop;
- err = ext4_init_acl(handle, inode, dir);
+ err = ext4_new_acl(handle, inode, dir);
if (err)
goto fail_free_drop;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 612fbcf..647f3c3 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -42,6 +42,7 @@
#include "xattr.h"
#include "acl.h"
#include "truncate.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
@@ -4638,6 +4639,14 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode)
}
}
+static inline int
+ext4_acl_chmod(struct inode *inode, umode_t mode)
+{
+ if (IS_RICHACL(inode))
+ return richacl_chmod(inode, inode->i_mode);
+ return posix_acl_chmod(inode, inode->i_mode);
+}
+
/*
* ext4_setattr()
*
@@ -4806,8 +4815,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
ext4_orphan_del(NULL, inode);
if (!rc && (ia_valid & ATTR_MODE))
- rc = posix_acl_chmod(inode, inode->i_mode);
-
+ rc = ext4_acl_chmod(inode, inode->i_mode);
err_out:
ext4_std_error(inode->i_sb, error);
if (!error)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 9f61e76..9b6e8b9 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -38,6 +38,7 @@
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
/*
@@ -3854,6 +3855,8 @@ const struct inode_operations ext4_dir_inode_operations = {
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
+ .get_richacl = ext4_get_richacl,
+ .set_richacl = ext4_set_richacl,
.fiemap = ext4_fiemap,
};
@@ -3865,4 +3868,6 @@ const struct inode_operations ext4_special_inode_operations = {
.removexattr = generic_removexattr,
.get_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
+ .get_richacl = ext4_get_richacl,
+ .set_richacl = ext4_set_richacl,
};
diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
new file mode 100644
index 0000000..906d048
--- /dev/null
+++ b/fs/ext4/richacl.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Author: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>,
+ * Andreas Gruenbacher <agruenba@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/richacl_xattr.h>
+
+#include "ext4.h"
+#include "ext4_jbd2.h"
+#include "xattr.h"
+#include "acl.h"
+#include "richacl.h"
+
+struct richacl *
+ext4_get_richacl(struct inode *inode)
+{
+ const int name_index = EXT4_XATTR_INDEX_RICHACL;
+ void *value = NULL;
+ struct richacl *acl = NULL;
+ int retval;
+
+ retval = ext4_xattr_get(inode, name_index, "", NULL, 0);
+ if (retval > 0) {
+ value = kmalloc(retval, GFP_NOFS);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ retval = ext4_xattr_get(inode, name_index, "", value, retval);
+ }
+ if (retval > 0) {
+ acl = richacl_from_xattr(&init_user_ns, value, retval);
+ if (acl == ERR_PTR(-EINVAL))
+ acl = ERR_PTR(-EIO);
+ } else if (retval != -ENODATA && retval != -ENOSYS)
+ acl = ERR_PTR(retval);
+ kfree(value);
+
+ if (!IS_ERR(acl))
+ set_cached_richacl(inode, acl);
+
+ return acl;
+}
+
+static int
+__ext4_remove_richacl(handle_t *handle, struct inode *inode)
+{
+ const int name_index = EXT4_XATTR_INDEX_RICHACL;
+ int retval;
+
+ retval = ext4_xattr_set_handle(handle, inode, name_index, "",
+ NULL, 0, 0);
+ if (!retval)
+ set_cached_richacl(inode, NULL);
+ return retval;
+}
+
+static int
+__ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
+{
+ const int name_index = EXT4_XATTR_INDEX_RICHACL;
+ umode_t mode = inode->i_mode;
+ int retval, size;
+ void *value;
+
+ if (richacl_equiv_mode(acl, &mode) == 0) {
+ inode->i_ctime = ext4_current_time(inode);
+ inode->i_mode = mode;
+ ext4_mark_inode_dirty(handle, inode);
+ return __ext4_remove_richacl(handle, inode);
+ }
+
+ mode &= ~S_IRWXUGO;
+ mode |= richacl_masks_to_mode(acl);
+
+ size = richacl_xattr_size(acl);
+ value = kmalloc(size, GFP_NOFS);
+ if (!value)
+ return -ENOMEM;
+ richacl_to_xattr(&init_user_ns, acl, value, size);
+ inode->i_mode = mode;
+ retval = ext4_xattr_set_handle(handle, inode, name_index, "",
+ value, size, 0);
+ kfree(value);
+ if (retval)
+ return retval;
+
+ set_cached_richacl(inode, acl);
+
+ return 0;
+}
+
+int
+ext4_set_richacl(struct inode *inode, struct richacl *acl)
+{
+ handle_t *handle;
+ int retval, retries = 0;
+
+retry:
+ handle = ext4_journal_start(inode, EXT4_HT_XATTR,
+ ext4_jbd2_credits_xattr(inode));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+
+ if (acl)
+ retval = __ext4_set_richacl(handle, inode, acl);
+ else
+ retval = __ext4_remove_richacl(handle, inode);
+
+ ext4_journal_stop(handle);
+ if (retval == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+ goto retry;
+ return retval;
+}
+
+int
+ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+ struct richacl *acl = richacl_create(&inode->i_mode, dir);
+ int error;
+
+ error = PTR_ERR(acl);
+ if (IS_ERR(acl))
+ return error;
+ if (acl) {
+ error = __ext4_set_richacl(handle, inode, acl);
+ richacl_put(acl);
+ }
+ return error;
+}
diff --git a/fs/ext4/richacl.h b/fs/ext4/richacl.h
new file mode 100644
index 0000000..6fe9a92
--- /dev/null
+++ b/fs/ext4/richacl.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser 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.
+ *
+ */
+
+#ifndef __FS_EXT4_RICHACL_H
+#define __FS_EXT4_RICHACL_H
+
+#include <linux/richacl.h>
+
+#ifdef CONFIG_EXT4_FS_RICHACL
+
+extern struct richacl *ext4_get_richacl(struct inode *);
+extern int ext4_set_richacl(struct inode *, struct richacl *);
+
+extern int ext4_init_richacl(handle_t *, struct inode *, struct inode *);
+
+#else /* CONFIG_EXT4_FS_RICHACL */
+
+#define ext4_get_richacl NULL
+#define ext4_set_richacl NULL
+
+static inline int
+ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+ return 0;
+}
+
+#endif /* CONFIG_EXT4_FS_RICHACL */
+#endif /* __FS_EXT4_RICHACL_H */
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 16e28c0..4d79adb 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -55,6 +55,7 @@
#include <linux/slab.h>
#include <linux/mbcache.h>
#include <linux/quotaops.h>
+#include <linux/richacl_xattr.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"
@@ -99,6 +100,9 @@ static const struct xattr_handler *ext4_xattr_handler_map[] = {
#ifdef CONFIG_EXT4_FS_SECURITY
[EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler,
#endif
+#ifdef CONFIG_EXT4_FS_RICHACL
+ [EXT4_XATTR_INDEX_RICHACL] = &richacl_xattr_handler,
+#endif
};
const struct xattr_handler *ext4_xattr_handlers[] = {
@@ -111,6 +115,9 @@ const struct xattr_handler *ext4_xattr_handlers[] = {
#ifdef CONFIG_EXT4_FS_SECURITY
&ext4_xattr_security_handler,
#endif
+#ifdef CONFIG_EXT4_FS_RICHACL
+ &richacl_xattr_handler,
+#endif
NULL
};
--
2.5.0
--
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[toc] | [prev] | [next] | [standalone]
| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:30 +0200 |
| Subject | [PATCH v11 27/48] richacl: Propagate everyone@ permissions to other aces |
| Message-ID | <qkf7f-1SN-87@gated-at.bofh.it> |
| In reply to | #1248844 |
The trailing everyone@ allow ace can grant permissions to all file
classes including the owner and group class. Before we can apply the
other mask to this entry to turn it into an "other class" entry, we need
to ensure that members of the owner or group class will not lose any
permissions from that ace.
Conceptually, we do this by inserting additional <who>:<allow>::allow
entries before the trailing everyone@ allow ace with the same
permissions as the trailing everyone@ allow ace for owner@, group@, and
all explicitly mentioned users and groups. (In practice, we will rarely
need to insert any additional aces in this step.)
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_compat.c | 198 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 198 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 4f0acf5..7d007d7 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -218,3 +218,201 @@ richacl_move_everyone_aces_down(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * __richacl_propagate_everyone - propagate everyone@ permissions up for @who
+ * @alloc: acl and number of allocated entries
+ * @who: identifier to propagate permissions for
+ * @allow: permissions to propagate up
+ *
+ * Propagate the permissions in @allow up from the end of the acl to the start
+ * for the specified principal @who.
+ *
+ * The simplest possible approach to achieve this would be to insert a
+ * "<who>:<allow>::allow" ace before the final everyone@ allow ace. Since this
+ * would often result in aces which are not needed or which could be merged
+ * with an existing ace, we make the following optimizations:
+ *
+ * - We go through the acl and determine which permissions are already
+ * allowed or denied to @who, and we remove those permissions from
+ * @allow.
+ *
+ * - If the acl contains an allow ace for @who and no aces after this entry
+ * deny permissions in @allow, we add the permissions in @allow to this
+ * ace. (Propagating permissions across a deny ace which can match the
+ * process can elevate permissions.)
+ *
+ * This transformation does not alter the permissions that the acl grants.
+ */
+static int
+__richacl_propagate_everyone(struct richacl_alloc *alloc, struct richace *who,
+ unsigned int allow)
+{
+ struct richace *allow_last = NULL, *ace;
+ struct richacl *acl = alloc->acl;
+
+ /*
+ * Remove the permissions from allow that are already determined for
+ * this who value, and figure out if there is an allow entry for
+ * this who value that is "reachable" from the trailing everyone@
+ * allow ace.
+ */
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_allow(ace)) {
+ if (richace_is_same_identifier(ace, who)) {
+ allow &= ~ace->e_mask;
+ allow_last = ace;
+ }
+ } else if (richace_is_deny(ace)) {
+ if (richace_is_same_identifier(ace, who))
+ allow &= ~ace->e_mask;
+ else if (allow & ace->e_mask)
+ allow_last = NULL;
+ }
+ }
+ ace--;
+
+ /*
+ * If for group class entries, all the remaining permissions will
+ * remain granted by the trailing everyone@ allow ace, no additional
+ * entry is needed.
+ */
+ if (!richace_is_owner(who) &&
+ richace_is_everyone(ace) &&
+ !(allow & ~(ace->e_mask & acl->a_other_mask)))
+ allow = 0;
+
+ if (allow) {
+ if (allow_last)
+ return richace_change_mask(alloc, &allow_last,
+ allow_last->e_mask | allow);
+ else {
+ struct richace who_copy;
+
+ richace_copy(&who_copy, who);
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ richace_copy(ace, &who_copy);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags &= ~RICHACE_INHERITANCE_FLAGS;
+ ace->e_mask = allow;
+ }
+ }
+ return 0;
+}
+
+/**
+ * richacl_propagate_everyone - propagate everyone@ permissions up the acl
+ * @alloc: acl and number of allocated entries
+ *
+ * Make sure that group@ and all other users and groups mentioned in the acl
+ * will not lose any permissions when finally applying the other mask to the
+ * everyone@ allow ace at the end of the acl. We modify the permissions of
+ * existing entries or add new entries before the final everyone@ allow ace to
+ * achieve that.
+ *
+ * For example, the following acl implicitly grants everyone rwpx access:
+ *
+ * joe:r::allow
+ * everyone@:rwpx::allow
+ *
+ * When applying mode 0660 to this acl, group@ would lose rwp access, and joe
+ * would lose wp access even though the mode does not exclude those
+ * permissions. After propagating the everyone@ permissions, the result for
+ * applying mode 0660 becomes:
+ *
+ * owner@:rwp::allow
+ * joe:rwp::allow
+ * group@:rwp::allow
+ *
+ * Deny aces complicate the matter. For example, the following acl grants
+ * everyone but joe write access:
+ *
+ * joe:wp::deny
+ * everyone@:rwpx::allow
+ *
+ * When applying mode 0660 to this acl, group@ would lose rwp access, and joe
+ * would lose r access. After propagating the everyone@ permissions, the
+ * result for applying mode 0660 becomes:
+ *
+ * owner@:rwp::allow
+ * joe:w::deny
+ * group@:rwp::allow
+ * joe:r::allow
+ */
+static int
+richacl_propagate_everyone(struct richacl_alloc *alloc)
+{
+ struct richace who = { .e_flags = RICHACE_SPECIAL_WHO };
+ struct richacl *acl = alloc->acl;
+ struct richace *ace;
+ unsigned int owner_allow, group_allow;
+
+ if (!acl->a_count)
+ return 0;
+ ace = acl->a_entries + acl->a_count - 1;
+ if (richace_is_inherit_only(ace) || !richace_is_everyone(ace))
+ return 0;
+
+ /*
+ * Permissions the owner and group class are granted through the
+ * trailing everyone@ allow ace.
+ */
+ owner_allow = ace->e_mask & acl->a_owner_mask;
+ group_allow = ace->e_mask & acl->a_group_mask;
+
+ /*
+ * If the group or other masks hide permissions which the owner should
+ * be allowed, we need to propagate those permissions up. Otherwise,
+ * those permissions may be lost when applying the other mask to the
+ * trailing everyone@ allow ace, or when isolating the group class from
+ * the other class through additional deny aces.
+ */
+ if (owner_allow & ~(acl->a_group_mask & acl->a_other_mask)) {
+ /* Propagate everyone@ permissions through to owner@. */
+ who.e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ if (__richacl_propagate_everyone(alloc, &who, owner_allow))
+ return -1;
+ acl = alloc->acl;
+ }
+
+ /*
+ * If the other mask hides permissions which the group class should be
+ * allowed, we need to propagate those permissions up to the owning
+ * group and to all other members in the group class.
+ */
+ if (group_allow & ~acl->a_other_mask) {
+ int n;
+
+ /* Propagate everyone@ permissions through to group@. */
+ who.e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ if (__richacl_propagate_everyone(alloc, &who, group_allow))
+ return -1;
+ acl = alloc->acl;
+
+ /*
+ * Start from the entry before the trailing everyone@ allow
+ * entry. We will not hit everyone@ entries in the loop.
+ */
+ for (n = acl->a_count - 2; n != -1; n--) {
+ ace = acl->a_entries + n;
+
+ if (richace_is_inherit_only(ace) ||
+ richace_is_owner(ace) ||
+ richace_is_group(ace))
+ continue;
+
+ /*
+ * Any inserted entry will end up below the current
+ * entry.
+ */
+ if (__richacl_propagate_everyone(alloc, ace,
+ group_allow))
+ return -1;
+ acl = alloc->acl;
+ }
+ }
+ return 0;
+}
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:40 +0200 |
| Subject | [PATCH v11 40/48] ext4: Don't allow unmapped identifiers in richacls |
| Message-ID | <qkfgS-25r-29@gated-at.bofh.it> |
| In reply to | #1248844 |
Don't allow acls which contain unmapped identifiers: they are meaningful
for remote file systems only.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/ext4/richacl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
index 906d048..2115385 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -74,6 +74,10 @@ __ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
int retval, size;
void *value;
+ /* Don't allow acls with unmapped identifiers. */
+ if (richacl_has_unmapped_identifiers(acl))
+ return -EINVAL;
+
if (richacl_equiv_mode(acl, &mode) == 0) {
inode->i_ctime = ext4_current_time(inode);
inode->i_mode = mode;
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:50 +0200 |
| Subject | [PATCH v11 26/48] richacl: Move everyone@ aces down the acl |
| Message-ID | <qkfqx-2iA-1@gated-at.bofh.it> |
| In reply to | #1248844 |
The POSIX standard puts processes which are not the owner or a member in
the owning group or which match any ace other then everyone@ on the
other file class. We only know if a process is in the other class after
processing the entire acl.
Move all everyone@ aces in the acl down in the acl so that at most a
single everyone@ allow ace remains at the end. Permissions which are
not explicitly allowed are implicitly denied, so an everyone@ deny ace
is unneeded.
The everyone@ aces can be moved down the acl without changing the
permissions that the acl grants. This transformation simplifies the
following algorithms, and eventually allows us to turn the final
everyone@ allow ace into an entry for the other class.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_compat.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 341e429..4f0acf5 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -153,3 +153,68 @@ richace_change_mask(struct richacl_alloc *alloc, struct richace **ace,
}
return 0;
}
+
+/**
+ * richacl_move_everyone_aces_down - move everyone@ aces to the end of the acl
+ * @alloc: acl and number of allocated entries
+ *
+ * Move all everyone aces to the end of the acl so that only a single everyone@
+ * allow ace remains at the end, and update the mask fields of all aces on the
+ * way. The last ace of the resulting acl will be an everyone@ allow ace only
+ * if @acl grants any permissions to @everyone. No @everyone deny aces will
+ * remain.
+ *
+ * This transformation does not alter the permissions that the acl grants.
+ * Having at most one everyone@ allow ace at the end of the acl helps us in the
+ * following algorithms.
+ */
+static int
+richacl_move_everyone_aces_down(struct richacl_alloc *alloc)
+{
+ struct richace *ace;
+ unsigned int allowed = 0, denied = 0;
+
+ richacl_for_each_entry(ace, alloc->acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_everyone(ace)) {
+ if (richace_is_allow(ace))
+ allowed |= (ace->e_mask & ~denied);
+ else if (richace_is_deny(ace))
+ denied |= (ace->e_mask & ~allowed);
+ else
+ continue;
+ if (richace_change_mask(alloc, &ace, 0))
+ return -1;
+ } else {
+ if (richace_is_allow(ace)) {
+ if (richace_change_mask(alloc, &ace, allowed |
+ (ace->e_mask & ~denied)))
+ return -1;
+ } else if (richace_is_deny(ace)) {
+ if (richace_change_mask(alloc, &ace, denied |
+ (ace->e_mask & ~allowed)))
+ return -1;
+ }
+ }
+ }
+ if (allowed & ~RICHACE_POSIX_ALWAYS_ALLOWED) {
+ struct richace *last_ace = ace - 1;
+
+ if (alloc->acl->a_entries &&
+ richace_is_everyone(last_ace) &&
+ richace_is_allow(last_ace) &&
+ richace_is_inherit_only(last_ace) &&
+ last_ace->e_mask == allowed)
+ last_ace->e_flags &= ~RICHACE_INHERIT_ONLY_ACE;
+ else {
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = allowed;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ }
+ }
+ return 0;
+}
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:50 +0200 |
| Subject | [PATCH v11 33/48] nfsd: Keep list of acls to dispose of in compoundargs |
| Message-ID | <qkfqx-2iA-5@gated-at.bofh.it> |
| In reply to | #1248844 |
We will decode acls in requests into richacls. Even if unlikely, there
can be more than one acl in a single request; those richacls need to be
richacl_put() at the end of the request instead of kfree()d, so keep a
list of acls in compoundargs for that.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>
---
fs/nfsd/nfs4xdr.c | 27 +++++++++++++++++++++++++++
fs/nfsd/xdr4.h | 6 ++++++
2 files changed, 33 insertions(+)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 51c9e9c..b8db5a7 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -40,6 +40,7 @@
#include <linux/utsname.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/richacl.h>
#include "idmap.h"
#include "acl.h"
@@ -196,6 +197,24 @@ svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
return tb->buf;
}
+static struct richacl *
+svcxdr_alloc_richacl(struct nfsd4_compoundargs *argp, u32 nace)
+{
+ struct svcxdr_richacl *acls;
+
+ acls = kmalloc(sizeof(*acls), GFP_KERNEL);
+ if (!acls)
+ return NULL;
+ acls->acl = richacl_alloc(nace, GFP_KERNEL);
+ if (!acls->acl) {
+ kfree(acls);
+ return NULL;
+ }
+ acls->next = argp->acls;
+ argp->acls = acls;
+ return acls->acl;
+}
+
/*
* For xdr strings that need to be passed to other kernel api's
* as null-terminated strings.
@@ -4437,6 +4456,13 @@ int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
args->to_free = tb->next;
kfree(tb);
}
+ while (args->acls) {
+ struct svcxdr_richacl *acls = args->acls;
+
+ args->acls = acls->next;
+ richacl_put(acls->acl);
+ kfree(acls);
+ }
return 1;
}
@@ -4455,6 +4481,7 @@ nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_comp
args->pagelen = rqstp->rq_arg.page_len;
args->tmpp = NULL;
args->to_free = NULL;
+ args->acls = NULL;
args->ops = args->iops;
args->rqstp = rqstp;
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 9f99100..b698585 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -570,6 +570,11 @@ struct svcxdr_tmpbuf {
char buf[];
};
+struct svcxdr_richacl {
+ struct svcxdr_richacl *next;
+ struct richacl *acl;
+};
+
struct nfsd4_compoundargs {
/* scratch variables for XDR decode */
__be32 * p;
@@ -579,6 +584,7 @@ struct nfsd4_compoundargs {
__be32 tmp[8];
__be32 * tmpp;
struct svcxdr_tmpbuf *to_free;
+ struct svcxdr_richacl *acls;
struct svc_rqst *rqstp;
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:50 +0200 |
| Subject | [PATCH v11 32/48] richacl: Create richacl from mode values |
| Message-ID | <qkfqx-2iA-7@gated-at.bofh.it> |
| In reply to | #1248844 |
A file can have "no acl" in the sense that only the file mode permission
bits determine access. In that case, the getxattr system call fails with
errno == ENODATA (No such attribute).
Over the NFSv4 protocol, a file always has an acl, and we convert the file
mode permission bits into an equivalent acl with richacl_from_mode. Such
"trivial" acls can be converted back to a file mode with
richacl_equiv_mode.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_compat.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 1 +
2 files changed, 89 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index c99274f..e513958 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -827,3 +827,91 @@ richacl_apply_masks(struct richacl **acl, kuid_t owner)
return 0;
}
EXPORT_SYMBOL_GPL(richacl_apply_masks);
+
+/**
+ * richacl_from_mode - create an acl which corresponds to @mode
+ *
+ * The resulting acl doesn't have the RICHACL_MASKED flag set.
+ *
+ * @mode: file mode including the file type
+ */
+struct richacl *
+richacl_from_mode(umode_t mode)
+{
+ unsigned int owner_mask = richacl_mode_to_mask(mode >> 6);
+ unsigned int group_mask = richacl_mode_to_mask(mode >> 3);
+ unsigned int other_mask = richacl_mode_to_mask(mode);
+ unsigned int denied;
+ unsigned int entries = 0;
+ struct richacl *acl;
+ struct richace *ace;
+
+ /* RICHACE_DELETE_CHILD is meaningless for non-directories. */
+ if (!S_ISDIR(mode)) {
+ owner_mask &= ~RICHACE_DELETE_CHILD;
+ group_mask &= ~RICHACE_DELETE_CHILD;
+ other_mask &= ~RICHACE_DELETE_CHILD;
+ }
+
+ denied = ~owner_mask & (group_mask | other_mask);
+ if (denied)
+ entries++; /* owner@ deny entry needed */
+ if (owner_mask & ~(group_mask & other_mask))
+ entries++; /* owner@ allow entry needed */
+ denied = ~group_mask & other_mask;
+ if (denied)
+ entries++; /* group@ deny entry needed */
+ if (group_mask & ~other_mask)
+ entries++; /* group@ allow entry needed */
+ if (other_mask)
+ entries++; /* everyone@ allow entry needed */
+
+ acl = richacl_alloc(entries, GFP_KERNEL);
+ if (!acl)
+ return NULL;
+ acl->a_owner_mask = owner_mask;
+ acl->a_group_mask = group_mask;
+ acl->a_other_mask = other_mask;
+ ace = acl->a_entries;
+
+ denied = ~owner_mask & (group_mask | other_mask);
+ if (denied) {
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = denied;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ ace++;
+ }
+ if (owner_mask & ~(group_mask & other_mask)) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = owner_mask;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ ace++;
+ }
+ denied = ~group_mask & other_mask;
+ if (denied) {
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = denied;
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ ace++;
+ }
+ if (group_mask & ~other_mask) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = group_mask;
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ ace++;
+ }
+ if (other_mask) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = other_mask;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ ace++;
+ }
+
+ return acl;
+}
+EXPORT_SYMBOL_GPL(richacl_from_mode);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 3f3445b..6d2e5bd 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -249,5 +249,6 @@ extern struct richacl *richacl_create(umode_t *, struct inode *);
/* richacl_compat.c */
extern int richacl_apply_masks(struct richacl **, kuid_t);
+extern struct richacl *richacl_from_mode(umode_t);
#endif /* __RICHACL_H */
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 17:50 +0200 |
| Subject | [PATCH v11 34/48] nfsd: Use richacls as internal acl representation |
| Message-ID | <qkfqy-2iA-21@gated-at.bofh.it> |
| In reply to | #1248844 |
When converting from NFSv4 ACLs to POSIX ACLs, nfsd so far was using
struct nfs4_acl as its internal representation. This representation is a
subset of richacls, so get rid of struct nfs4_acl. Richacls even have a
more compact in-memory representation, so a few more ACL entries can
easily be supported.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Acked-by: J. Bruce Fields <bfields@redhat.com>
---
fs/Kconfig | 6 +
fs/nfs_common/Makefile | 1 +
fs/nfs_common/nfs4acl.c | 44 ++++++
fs/nfsd/Kconfig | 1 +
fs/nfsd/acl.h | 24 ++--
fs/nfsd/nfs4acl.c | 368 ++++++++++++++++++++++--------------------------
fs/nfsd/nfs4proc.c | 15 +-
fs/nfsd/nfs4xdr.c | 64 +++------
fs/nfsd/xdr4.h | 6 +-
include/linux/nfs4.h | 23 ---
include/linux/nfs4acl.h | 7 +
11 files changed, 274 insertions(+), 285 deletions(-)
create mode 100644 fs/nfs_common/nfs4acl.c
create mode 100644 include/linux/nfs4acl.h
diff --git a/fs/Kconfig b/fs/Kconfig
index bff2879..68bc3e1 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -265,6 +265,12 @@ config NFS_COMMON
depends on NFSD || NFS_FS || LOCKD
default y
+config NFS_RICHACL
+ bool
+ depends on NFSD_V4 || NFS_V4
+ select FS_RICHACL
+ default y
+
source "net/sunrpc/Kconfig"
source "fs/ceph/Kconfig"
source "fs/cifs/Kconfig"
diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile
index d153ca3..e055139 100644
--- a/fs/nfs_common/Makefile
+++ b/fs/nfs_common/Makefile
@@ -4,5 +4,6 @@
obj-$(CONFIG_NFS_ACL_SUPPORT) += nfs_acl.o
nfs_acl-objs := nfsacl.o
+obj-$(CONFIG_NFS_RICHACL) += nfs4acl.o
obj-$(CONFIG_GRACE_PERIOD) += grace.o
diff --git a/fs/nfs_common/nfs4acl.c b/fs/nfs_common/nfs4acl.c
new file mode 100644
index 0000000..02df064
--- /dev/null
+++ b/fs/nfs_common/nfs4acl.c
@@ -0,0 +1,44 @@
+#include <linux/fs.h>
+#include <linux/richacl.h>
+#include <linux/nfs4acl.h>
+
+static struct special_id {
+ char *who;
+ int len;
+} special_who_map[] = {
+ [RICHACE_OWNER_SPECIAL_ID] = {
+ .who = "OWNER@",
+ .len = sizeof("OWNER@") - 1 },
+ [RICHACE_GROUP_SPECIAL_ID] = {
+ .who = "GROUP@",
+ .len = sizeof("GROUP@") - 1 },
+ [RICHACE_EVERYONE_SPECIAL_ID] = {
+ .who = "EVERYONE@",
+ .len = sizeof("EVERYONE@") - 1 }
+};
+
+int nfs4acl_who_to_special_id(const char *who, u32 len)
+{
+ int n;
+
+ for (n = 0; n < ARRAY_SIZE(special_who_map); n++) {
+ if (len == special_who_map[n].len &&
+ !memcmp(who, special_who_map[n].who, len))
+ return n;
+ }
+ return -1;
+}
+EXPORT_SYMBOL(nfs4acl_who_to_special_id);
+
+bool nfs4acl_special_id_to_who(unsigned int special_who,
+ const char **who, unsigned int *len)
+{
+ struct special_id *special = &special_who_map[special_who];
+
+ if (special_who > ARRAY_SIZE(special_who_map) || !special->len)
+ return false;
+ *who = special->who;
+ *len = special->len;
+ return true;
+}
+EXPORT_SYMBOL(nfs4acl_special_id_to_who);
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index a0b77fc..811379a 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -70,6 +70,7 @@ config NFSD_V4
depends on NFSD && PROC_FS
select NFSD_V3
select FS_POSIX_ACL
+ select FS_RICHACL
select SUNRPC_GSS
select CRYPTO
select GRACE_PERIOD
diff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index 4cd7c69..1c5deb5 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -35,25 +35,27 @@
#ifndef LINUX_NFS4_ACL_H
#define LINUX_NFS4_ACL_H
-struct nfs4_acl;
+struct richacl;
+struct richace;
struct svc_fh;
struct svc_rqst;
/*
* Maximum ACL we'll accept from a client; chosen (somewhat
* arbitrarily) so that kmalloc'ing the ACL shouldn't require a
- * high-order allocation. This allows 204 ACEs on x86_64:
+ * high-order allocation. This allows 339 ACEs on x86_64:
*/
-#define NFS4_ACL_MAX ((PAGE_SIZE - sizeof(struct nfs4_acl)) \
- / sizeof(struct nfs4_ace))
+#define NFSD4_ACL_MAX ((PAGE_SIZE - sizeof(struct richacl)) \
+ / sizeof(struct richace))
-int nfs4_acl_bytes(int entries);
-int nfs4_acl_get_whotype(char *, u32);
-__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who);
+__be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
+ char *who, u32 len);
+__be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ struct richace *ace);
-int nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
- struct nfs4_acl **acl);
-__be32 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl);
+int nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry,
+ struct richacl **acl);
+__be32 nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct richacl *acl);
#endif /* LINUX_NFS4_ACL_H */
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 6adabd6..6d3bb72 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -37,46 +37,50 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/posix_acl.h>
+#include <linux/nfs_fs.h>
+#include <linux/richacl_compat.h>
+#include <linux/nfs4acl.h>
#include "nfsfh.h"
#include "nfsd.h"
+#include "idmap.h"
#include "acl.h"
#include "vfs.h"
-#define NFS4_ACL_TYPE_DEFAULT 0x01
-#define NFS4_ACL_DIR 0x02
-#define NFS4_ACL_OWNER 0x04
+#define FLAG_DEFAULT_ACL 0x01
+#define FLAG_DIRECTORY 0x02
+#define FLAG_OWNER 0x04
/* mode bit translations: */
-#define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
-#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
-#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
-#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
-#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
+#define RICHACE_READ_MODE (RICHACE_READ_DATA)
+#define RICHACE_WRITE_MODE (RICHACE_WRITE_DATA | RICHACE_APPEND_DATA)
+#define RICHACE_EXECUTE_MODE RICHACE_EXECUTE
+#define RICHACE_ANYONE_MODE (RICHACE_READ_ATTRIBUTES | RICHACE_READ_ACL | RICHACE_SYNCHRONIZE)
+#define RICHACE_OWNER_MODE (RICHACE_WRITE_ATTRIBUTES | RICHACE_WRITE_ACL)
/* flags used to simulate posix default ACLs */
-#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
- | NFS4_ACE_DIRECTORY_INHERIT_ACE)
-
-#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
- | NFS4_ACE_INHERIT_ONLY_ACE \
- | NFS4_ACE_IDENTIFIER_GROUP)
+#define RICHACE_SUPPORTED_FLAGS ( \
+ RICHACE_FILE_INHERIT_ACE | \
+ RICHACE_DIRECTORY_INHERIT_ACE | \
+ RICHACE_INHERIT_ONLY_ACE | \
+ RICHACE_IDENTIFIER_GROUP | \
+ RICHACE_SPECIAL_WHO)
static u32
mask_from_posix(unsigned short perm, unsigned int flags)
{
- int mask = NFS4_ANYONE_MODE;
+ int mask = RICHACE_ANYONE_MODE;
- if (flags & NFS4_ACL_OWNER)
- mask |= NFS4_OWNER_MODE;
+ if (flags & FLAG_OWNER)
+ mask |= RICHACE_OWNER_MODE;
if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
+ mask |= RICHACE_READ_MODE;
if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
+ mask |= RICHACE_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & FLAG_DIRECTORY))
+ mask |= RICHACE_DELETE_CHILD;
if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
+ mask |= RICHACE_EXECUTE_MODE;
return mask;
}
@@ -86,13 +90,13 @@ deny_mask_from_posix(unsigned short perm, u32 flags)
u32 mask = 0;
if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
+ mask |= RICHACE_READ_MODE;
if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
+ mask |= RICHACE_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & FLAG_DIRECTORY))
+ mask |= RICHACE_DELETE_CHILD;
if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
+ mask |= RICHACE_EXECUTE_MODE;
return mask;
}
@@ -108,32 +112,33 @@ deny_mask_from_posix(unsigned short perm, u32 flags)
static void
low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
{
- u32 write_mode = NFS4_WRITE_MODE;
+ u32 write_mode = RICHACE_WRITE_MODE;
- if (flags & NFS4_ACL_DIR)
- write_mode |= NFS4_ACE_DELETE_CHILD;
+ if (flags & FLAG_DIRECTORY)
+ write_mode |= RICHACE_DELETE_CHILD;
*mode = 0;
- if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
+ if ((perm & RICHACE_READ_MODE) == RICHACE_READ_MODE)
*mode |= ACL_READ;
if ((perm & write_mode) == write_mode)
*mode |= ACL_WRITE;
- if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
+ if ((perm & RICHACE_EXECUTE_MODE) == RICHACE_EXECUTE_MODE)
*mode |= ACL_EXECUTE;
}
-static short ace2type(struct nfs4_ace *);
-static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
+static short ace2type(struct richace *);
+static void _posix_to_richacl_one(struct posix_acl *, struct richacl_alloc *,
unsigned int);
int
-nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
- struct nfs4_acl **acl)
+nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry,
+ struct richacl **acl)
{
struct inode *inode = d_inode(dentry);
int error = 0;
struct posix_acl *pacl = NULL, *dpacl = NULL;
+ struct richacl_alloc alloc;
unsigned int flags = 0;
- int size = 0;
+ int count;
pacl = get_acl(inode, ACL_TYPE_ACCESS);
if (!pacl)
@@ -143,10 +148,10 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
return PTR_ERR(pacl);
/* allocate for worst case: one (deny, allow) pair each: */
- size += 2 * pacl->a_count;
+ count = 2 * pacl->a_count;
if (S_ISDIR(inode->i_mode)) {
- flags = NFS4_ACL_DIR;
+ flags = FLAG_DIRECTORY;
dpacl = get_acl(inode, ACL_TYPE_DEFAULT);
if (IS_ERR(dpacl)) {
error = PTR_ERR(dpacl);
@@ -154,20 +159,20 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
}
if (dpacl)
- size += 2 * dpacl->a_count;
+ count += 2 * dpacl->a_count;
}
- *acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL);
- if (*acl == NULL) {
+ if (!richacl_prepare(&alloc, count)) {
error = -ENOMEM;
goto out;
}
- (*acl)->naces = 0;
- _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
+ _posix_to_richacl_one(pacl, &alloc, flags);
if (dpacl)
- _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT);
+ _posix_to_richacl_one(dpacl, &alloc, flags | FLAG_DEFAULT_ACL);
+
+ *acl = alloc.acl;
out:
posix_acl_release(dpacl);
@@ -230,21 +235,22 @@ summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
/* We assume the acl has been verified with posix_acl_valid. */
static void
-_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
- unsigned int flags)
+_posix_to_richacl_one(struct posix_acl *pacl, struct richacl_alloc *alloc,
+ unsigned int flags)
{
struct posix_acl_entry *pa, *group_owner_entry;
- struct nfs4_ace *ace;
+ struct richace *ace;
struct posix_acl_summary pas;
unsigned short deny;
- int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
- NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
+ int e_flags = ((flags & FLAG_DEFAULT_ACL) ?
+ (RICHACE_FILE_INHERIT_ACE |
+ RICHACE_DIRECTORY_INHERIT_ACE |
+ RICHACE_INHERIT_ONLY_ACE) : 0);
BUG_ON(pacl->a_count < 3);
summarize_posix_acl(pacl, &pas);
pa = pacl->a_entries;
- ace = acl->aces + acl->naces;
/* We could deny everything not granted by the owner: */
deny = ~pas.owner;
@@ -254,42 +260,35 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
*/
deny &= pas.users | pas.group | pas.groups | pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
}
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pa->e_perm, flags | FLAG_OWNER);
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
pa++;
while (pa->e_tag == ACL_USER) {
deny = ~(pa->e_perm & pas.mask);
deny &= pas.groups | pas.group | pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.uid = pa->e_uid;
}
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags;
+ ace->e_mask = mask_from_posix(pa->e_perm & pas.mask, flags);
+ ace->e_id.uid = pa->e_uid;
pa++;
}
@@ -300,23 +299,19 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
group_owner_entry = pa;
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pas.group, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pas.group, flags);
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
pa++;
while (pa->e_tag == ACL_GROUP) {
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_IDENTIFIER_GROUP;
+ ace->e_mask = mask_from_posix(pa->e_perm & pas.mask, flags);
+ ace->e_id.gid = pa->e_gid;
pa++;
}
@@ -326,12 +321,11 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
deny = ~pas.group & pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
}
pa++;
@@ -339,24 +333,22 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
deny = ~(pa->e_perm & pas.mask);
deny &= pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_IDENTIFIER_GROUP;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.gid = pa->e_gid;
}
pa++;
}
if (pa->e_tag == ACL_MASK)
pa++;
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags);
- ace->whotype = NFS4_ACL_WHO_EVERYONE;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pa->e_perm, flags);
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
}
static bool
@@ -500,7 +492,7 @@ posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
* and effective cases: when there are no inheritable ACEs,
* calls ->set_acl with a NULL ACL structure.
*/
- if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT))
+ if (state->empty && (flags & FLAG_DEFAULT_ACL))
return NULL;
/*
@@ -619,24 +611,24 @@ static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
}
static void process_one_v4_ace(struct posix_acl_state *state,
- struct nfs4_ace *ace)
+ struct richace *ace)
{
- u32 mask = ace->access_mask;
+ u32 mask = ace->e_mask;
int i;
state->empty = 0;
switch (ace2type(ace)) {
case ACL_USER_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->owner, mask);
} else {
deny_bits(&state->owner, mask);
}
break;
case ACL_USER:
- i = find_uid(state, ace->who_uid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ i = find_uid(state, ace->e_id.uid);
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->users->aces[i].perms, mask);
} else {
deny_bits(&state->users->aces[i].perms, mask);
@@ -645,7 +637,7 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_GROUP_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->group, mask);
} else {
deny_bits(&state->group, mask);
@@ -657,8 +649,8 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_GROUP:
- i = find_gid(state, ace->who_gid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ i = find_gid(state, ace->e_id.gid);
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->groups->aces[i].perms, mask);
} else {
deny_bits(&state->groups->aces[i].perms, mask);
@@ -671,7 +663,7 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_OTHER:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->owner, mask);
allow_bits(&state->group, mask);
allow_bits(&state->other, mask);
@@ -689,32 +681,33 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
}
-static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
+static int nfs4_richacl_to_posix(struct richacl *acl,
struct posix_acl **pacl, struct posix_acl **dpacl,
unsigned int flags)
{
struct posix_acl_state effective_acl_state, default_acl_state;
- struct nfs4_ace *ace;
+ struct richace *ace;
int ret;
- ret = init_state(&effective_acl_state, acl->naces);
+ ret = init_state(&effective_acl_state, acl->a_count);
if (ret)
return ret;
- ret = init_state(&default_acl_state, acl->naces);
+ ret = init_state(&default_acl_state, acl->a_count);
if (ret)
goto out_estate;
ret = -EINVAL;
- for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
- if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
- ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_type != RICHACE_ACCESS_ALLOWED_ACE_TYPE &&
+ ace->e_type != RICHACE_ACCESS_DENIED_ACE_TYPE)
goto out_dstate;
- if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
+ if (ace->e_flags & ~RICHACE_SUPPORTED_FLAGS)
goto out_dstate;
- if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
+ if ((ace->e_flags & (RICHACE_FILE_INHERIT_ACE |
+ RICHACE_DIRECTORY_INHERIT_ACE)) == 0) {
process_one_v4_ace(&effective_acl_state, ace);
continue;
}
- if (!(flags & NFS4_ACL_DIR))
+ if (!(flags & FLAG_DIRECTORY))
goto out_dstate;
/*
* Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
@@ -723,7 +716,7 @@ static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
*/
process_one_v4_ace(&default_acl_state, ace);
- if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
+ if (!(ace->e_flags & RICHACE_INHERIT_ONLY_ACE))
process_one_v4_ace(&effective_acl_state, ace);
}
*pacl = posix_state_to_acl(&effective_acl_state, flags);
@@ -733,7 +726,7 @@ static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
goto out_dstate;
}
*dpacl = posix_state_to_acl(&default_acl_state,
- flags | NFS4_ACL_TYPE_DEFAULT);
+ flags | FLAG_DEFAULT_ACL);
if (IS_ERR(*dpacl)) {
ret = PTR_ERR(*dpacl);
*dpacl = NULL;
@@ -752,8 +745,7 @@ out_estate:
}
__be32
-nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl)
+nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl)
{
__be32 error;
int host_error;
@@ -774,9 +766,9 @@ nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
return nfserr_attrnotsupp;
if (S_ISDIR(inode->i_mode))
- flags = NFS4_ACL_DIR;
+ flags = FLAG_DIRECTORY;
- host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
+ host_error = nfs4_richacl_to_posix(acl, &pacl, &dpacl, flags);
if (host_error == -EINVAL)
return nfserr_attrnotsupp;
if (host_error < 0)
@@ -803,82 +795,62 @@ out_nfserr:
static short
-ace2type(struct nfs4_ace *ace)
+ace2type(struct richace *ace)
{
- switch (ace->whotype) {
- case NFS4_ACL_WHO_NAMED:
- return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
- ACL_GROUP : ACL_USER);
- case NFS4_ACL_WHO_OWNER:
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ switch (ace->e_id.special) {
+ case RICHACE_OWNER_SPECIAL_ID:
return ACL_USER_OBJ;
- case NFS4_ACL_WHO_GROUP:
+ case RICHACE_GROUP_SPECIAL_ID:
return ACL_GROUP_OBJ;
- case NFS4_ACL_WHO_EVERYONE:
+ case RICHACE_EVERYONE_SPECIAL_ID:
return ACL_OTHER;
+ default:
+ BUG();
+ }
}
- BUG();
- return -1;
-}
-
-/*
- * return the size of the struct nfs4_acl required to represent an acl
- * with @entries entries.
- */
-int nfs4_acl_bytes(int entries)
-{
- return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace);
+ return ace->e_flags & RICHACE_IDENTIFIER_GROUP ? ACL_GROUP : ACL_USER;
}
-static struct {
- char *string;
- int stringlen;
- int type;
-} s2t_map[] = {
- {
- .string = "OWNER@",
- .stringlen = sizeof("OWNER@") - 1,
- .type = NFS4_ACL_WHO_OWNER,
- },
- {
- .string = "GROUP@",
- .stringlen = sizeof("GROUP@") - 1,
- .type = NFS4_ACL_WHO_GROUP,
- },
- {
- .string = "EVERYONE@",
- .stringlen = sizeof("EVERYONE@") - 1,
- .type = NFS4_ACL_WHO_EVERYONE,
- },
-};
-
-int
-nfs4_acl_get_whotype(char *p, u32 len)
+__be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
+ char *who, u32 len)
{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
- if (s2t_map[i].stringlen == len &&
- 0 == memcmp(s2t_map[i].string, p, len))
- return s2t_map[i].type;
+ int special_id;
+
+ special_id = nfs4acl_who_to_special_id(who, len);
+ if (special_id >= 0) {
+ ace->e_flags |= RICHACE_SPECIAL_WHO;
+ ace->e_flags &= ~RICHACE_IDENTIFIER_GROUP;
+ ace->e_id.special = special_id;
+ return nfs_ok;
}
- return NFS4_ACL_WHO_NAMED;
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ return nfsd_map_name_to_gid(rqstp, who, len, &ace->e_id.gid);
+ else
+ return nfsd_map_name_to_uid(rqstp, who, len, &ace->e_id.uid);
}
-__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who)
+__be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ struct richace *ace)
{
- __be32 *p;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
- if (s2t_map[i].type != who)
- continue;
- p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ unsigned int special_id = ace->e_id.special;
+ const char *who;
+ unsigned int len;
+ __be32 *p;
+
+ if (!nfs4acl_special_id_to_who(special_id, &who, &len)) {
+ WARN_ON_ONCE(1);
+ return nfserr_serverfault;
+ }
+ p = xdr_reserve_space(xdr, len + 4);
if (!p)
return nfserr_resource;
- p = xdr_encode_opaque(p, s2t_map[i].string,
- s2t_map[i].stringlen);
+ p = xdr_encode_opaque(p, who, len);
return 0;
}
- WARN_ON_ONCE(1);
- return nfserr_serverfault;
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ return nfsd4_encode_group(xdr, rqstp, ace->e_id.gid);
+ else
+ return nfsd4_encode_user(xdr, rqstp, ace->e_id.uid);
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4ce6b97..2430235 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -159,12 +159,12 @@ is_create_with_attrs(struct nfsd4_open *open)
* in the returned attr bitmap.
*/
static void
-do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl, u32 *bmval)
+do_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl,
+ u32 *bmval)
{
__be32 status;
- status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
+ status = nfsd4_set_acl(rqstp, fhp, acl);
if (status)
/*
* We should probably fail the whole open at this point,
@@ -299,7 +299,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
goto out;
if (is_create_with_attrs(open) && open->op_acl != NULL)
- do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
+ do_set_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
accmode = NFSD_MAY_NOP;
@@ -672,8 +672,7 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
if (create->cr_acl != NULL)
- do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
- create->cr_bmval);
+ do_set_acl(rqstp, &resfh, create->cr_acl, create->cr_bmval);
fh_unlock(&cstate->current_fh);
set_change_info(&create->cr_cinfo, &cstate->current_fh);
@@ -938,8 +937,8 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
goto out;
if (setattr->sa_acl != NULL)
- status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
- setattr->sa_acl);
+ status = nfsd4_set_acl(rqstp, &cstate->current_fh,
+ setattr->sa_acl);
if (status)
goto out;
if (setattr->sa_label.len)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index b8db5a7..8603f40 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -303,7 +303,7 @@ nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
static __be32
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
- struct iattr *iattr, struct nfs4_acl **acl,
+ struct iattr *iattr, struct richacl **acl,
struct xdr_netobj *label)
{
int expected_len, len = 0;
@@ -326,38 +326,31 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
}
if (bmval[0] & FATTR4_WORD0_ACL) {
u32 nace;
- struct nfs4_ace *ace;
+ struct richace *ace;
READ_BUF(4); len += 4;
nace = be32_to_cpup(p++);
- if (nace > NFS4_ACL_MAX)
+ if (nace > NFSD4_ACL_MAX)
return nfserr_fbig;
- *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
+ *acl = svcxdr_alloc_richacl(argp, nace);
if (*acl == NULL)
return nfserr_jukebox;
- (*acl)->naces = nace;
- for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
+ richacl_for_each_entry(ace, *acl) {
READ_BUF(16); len += 16;
- ace->type = be32_to_cpup(p++);
- ace->flag = be32_to_cpup(p++);
- ace->access_mask = be32_to_cpup(p++);
+ ace->e_type = be32_to_cpup(p++);
+ ace->e_flags = be32_to_cpup(p++);
+ ace->e_mask = be32_to_cpup(p++);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO)
+ return nfserr_inval;
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += XDR_QUADLEN(dummy32) << 2;
READMEM(buf, dummy32);
- ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
- status = nfs_ok;
- if (ace->whotype != NFS4_ACL_WHO_NAMED)
- ;
- else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
- status = nfsd_map_name_to_gid(argp->rqstp,
- buf, dummy32, &ace->who_gid);
- else
- status = nfsd_map_name_to_uid(argp->rqstp,
- buf, dummy32, &ace->who_uid);
+ status = nfsd4_decode_ace_who(ace, argp->rqstp,
+ buf, dummy32);
if (status)
return status;
}
@@ -2148,18 +2141,6 @@ static u32 nfs4_file_type(umode_t mode)
}
static inline __be32
-nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
- struct nfs4_ace *ace)
-{
- if (ace->whotype != NFS4_ACL_WHO_NAMED)
- return nfs4_acl_write_who(xdr, ace->whotype);
- else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
- return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
- else
- return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
-}
-
-static inline __be32
nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
{
__be32 *p;
@@ -2303,7 +2284,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
u32 rdattr_err = 0;
__be32 status;
int err;
- struct nfs4_acl *acl = NULL;
+ struct richacl *acl = NULL;
void *context = NULL;
int contextlen;
bool contextsupport = false;
@@ -2349,7 +2330,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
fhp = tempfh;
}
if (bmval0 & FATTR4_WORD0_ACL) {
- err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
+ err = nfsd4_get_acl(rqstp, dentry, &acl);
if (err == -EOPNOTSUPP)
bmval0 &= ~FATTR4_WORD0_ACL;
else if (err == -EINVAL) {
@@ -2504,7 +2485,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
*p++ = cpu_to_be32(rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
- struct nfs4_ace *ace;
+ struct richace *ace;
if (acl == NULL) {
p = xdr_reserve_space(xdr, 4);
@@ -2517,17 +2498,16 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
- *p++ = cpu_to_be32(acl->naces);
+ *p++ = cpu_to_be32(acl->a_count);
- for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
+ richacl_for_each_entry(ace, acl) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
- *p++ = cpu_to_be32(ace->type);
- *p++ = cpu_to_be32(ace->flag);
- *p++ = cpu_to_be32(ace->access_mask &
- NFS4_ACE_MASK_ALL);
- status = nfsd4_encode_aclname(xdr, rqstp, ace);
+ *p++ = cpu_to_be32(ace->e_type);
+ *p++ = cpu_to_be32(ace->e_flags & ~RICHACE_SPECIAL_WHO);
+ *p++ = cpu_to_be32(ace->e_mask & NFS4_ACE_MASK_ALL);
+ status = nfsd4_encode_ace_who(xdr, rqstp, ace);
if (status)
goto out;
}
@@ -2792,7 +2772,7 @@ out:
if (context)
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
- kfree(acl);
+ richacl_put(acl);
if (tempfh) {
fh_put(tempfh);
kfree(tempfh);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index b698585..c311066 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -118,7 +118,7 @@ struct nfsd4_create {
u32 cr_bmval[3]; /* request */
struct iattr cr_iattr; /* request */
struct nfsd4_change_info cr_cinfo; /* response */
- struct nfs4_acl *cr_acl;
+ struct richacl *cr_acl;
struct xdr_netobj cr_label;
};
#define cr_datalen u.link.datalen
@@ -248,7 +248,7 @@ struct nfsd4_open {
struct nfs4_file *op_file; /* used during processing */
struct nfs4_ol_stateid *op_stp; /* used during processing */
struct nfs4_clnt_odstate *op_odstate; /* used during processing */
- struct nfs4_acl *op_acl;
+ struct richacl *op_acl;
struct xdr_netobj op_label;
};
@@ -332,7 +332,7 @@ struct nfsd4_setattr {
stateid_t sa_stateid; /* request */
u32 sa_bmval[3]; /* request */
struct iattr sa_iattr; /* request */
- struct nfs4_acl *sa_acl;
+ struct richacl *sa_acl;
struct xdr_netobj sa_label;
};
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 00121f2..1422fc6 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -16,29 +16,6 @@
#include <linux/uidgid.h>
#include <uapi/linux/nfs4.h>
-enum nfs4_acl_whotype {
- NFS4_ACL_WHO_NAMED = 0,
- NFS4_ACL_WHO_OWNER,
- NFS4_ACL_WHO_GROUP,
- NFS4_ACL_WHO_EVERYONE,
-};
-
-struct nfs4_ace {
- uint32_t type;
- uint32_t flag;
- uint32_t access_mask;
- int whotype;
- union {
- kuid_t who_uid;
- kgid_t who_gid;
- };
-};
-
-struct nfs4_acl {
- uint32_t naces;
- struct nfs4_ace aces[0];
-};
-
#define NFS4_MAXLABELLEN 2048
struct nfs4_label {
diff --git a/include/linux/nfs4acl.h b/include/linux/nfs4acl.h
new file mode 100644
index 0000000..db9f9a6
--- /dev/null
+++ b/include/linux/nfs4acl.h
@@ -0,0 +1,7 @@
+#ifndef __LINUX_NFS4ACL_H
+#define __LINUX_NFS4ACL_H
+
+int nfs4acl_who_to_special_id(const char *, u32);
+bool nfs4acl_special_id_to_who(unsigned int, const char **, unsigned int *);
+
+#endif
--
2.5.0
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 18:00 +0200 |
| Subject | [PATCH v11 15/48] richacl: Create-time inheritance |
| Message-ID | <qkfAd-2um-5@gated-at.bofh.it> |
| In reply to | #1248844 |
When a new file is created, it can inherit an acl from its parent
directory; this is similar to how default acls work in POSIX (draft)
ACLs.
As with POSIX ACLs, if a file inherits an acl from its parent directory,
the intersection between the create mode and the permissions granted by
the inherited acl determines the file masks and file permission bits,
and the umask is ignored.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_base.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++
fs/richacl_inode.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 2 ++
3 files changed, 140 insertions(+)
diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index f4b8d3c..cb5081e 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -486,3 +486,71 @@ richacl_equiv_mode(const struct richacl *acl, umode_t *mode_p)
return 0;
}
EXPORT_SYMBOL_GPL(richacl_equiv_mode);
+
+/**
+ * richacl_inherit - compute the inherited acl of a new file
+ * @dir_acl: acl of the containing directory
+ * @isdir: inherit by a directory or non-directory?
+ *
+ * A directory can have acl entries which files and/or directories created
+ * inside the directory will inherit. This function computes the acl for such
+ * a new file. If there is no inheritable acl, it will return %NULL.
+ */
+struct richacl *
+richacl_inherit(const struct richacl *dir_acl, int isdir)
+{
+ const struct richace *dir_ace;
+ struct richacl *acl = NULL;
+ struct richace *ace;
+ int count = 0;
+
+ if (isdir) {
+ richacl_for_each_entry(dir_ace, dir_acl) {
+ if (!richace_is_inheritable(dir_ace))
+ continue;
+ count++;
+ }
+ if (!count)
+ return NULL;
+ acl = richacl_alloc(count, GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ ace = acl->a_entries;
+ richacl_for_each_entry(dir_ace, dir_acl) {
+ if (!richace_is_inheritable(dir_ace))
+ continue;
+ richace_copy(ace, dir_ace);
+ if (dir_ace->e_flags & RICHACE_NO_PROPAGATE_INHERIT_ACE)
+ ace->e_flags &= ~RICHACE_INHERITANCE_FLAGS;
+ else if (!(dir_ace->e_flags & RICHACE_DIRECTORY_INHERIT_ACE))
+ ace->e_flags |= RICHACE_INHERIT_ONLY_ACE;
+ ace++;
+ }
+ } else {
+ richacl_for_each_entry(dir_ace, dir_acl) {
+ if (!(dir_ace->e_flags & RICHACE_FILE_INHERIT_ACE))
+ continue;
+ count++;
+ }
+ if (!count)
+ return NULL;
+ acl = richacl_alloc(count, GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ ace = acl->a_entries;
+ richacl_for_each_entry(dir_ace, dir_acl) {
+ if (!(dir_ace->e_flags & RICHACE_FILE_INHERIT_ACE))
+ continue;
+ richace_copy(ace, dir_ace);
+ ace->e_flags &= ~RICHACE_INHERITANCE_FLAGS;
+ /*
+ * RICHACE_DELETE_CHILD is meaningless for
+ * non-directories, so clear it.
+ */
+ ace->e_mask &= ~RICHACE_DELETE_CHILD;
+ ace++;
+ }
+ }
+
+ return acl;
+}
diff --git a/fs/richacl_inode.c b/fs/richacl_inode.c
index be11832..4f3a1b7 100644
--- a/fs/richacl_inode.c
+++ b/fs/richacl_inode.c
@@ -252,3 +252,73 @@ richacl_chmod(struct inode *inode, umode_t mode)
return retval;
}
EXPORT_SYMBOL(richacl_chmod);
+
+/*
+ * richacl_inherit_inode - compute inherited acl and file mode
+ * @dir_acl: acl of the containing directory
+ * @mode_p: mode of the new inode
+ *
+ * The file permission bits in @mode_p must be set to the create mode by the
+ * caller.
+ *
+ * If there is an inheritable acl, the maximum permissions that the acl grants
+ * are computed and the file masks of the new acl are set accordingly.
+ */
+static struct richacl *
+richacl_inherit_inode(const struct richacl *dir_acl, umode_t *mode_p)
+{
+ struct richacl *acl;
+ umode_t mode = *mode_p;
+
+ acl = richacl_inherit(dir_acl, S_ISDIR(mode));
+ if (acl) {
+ if (richacl_equiv_mode(acl, &mode) == 0) {
+ *mode_p &= mode;
+ richacl_put(acl);
+ acl = NULL;
+ } else {
+ richacl_compute_max_masks(acl);
+ /*
+ * Ensure that the acl will not grant any permissions
+ * beyond the create mode.
+ */
+ acl->a_flags |= RICHACL_MASKED;
+ acl->a_owner_mask &=
+ richacl_mode_to_mask(mode >> 6);
+ acl->a_group_mask &=
+ richacl_mode_to_mask(mode >> 3);
+ acl->a_other_mask &=
+ richacl_mode_to_mask(mode);
+ }
+ } else
+ *mode_p &= ~current_umask();
+
+ return acl;
+}
+
+/**
+ * richacl_create - filesystem create helper
+ * @mode_p: mode of the new inode
+ * @dir: containing directory
+ *
+ * Compute the inherited acl for a new inode. If there is no acl to inherit,
+ * apply the umask. Use when creating a new inode on a richacl enabled file
+ * system.
+ */
+struct richacl *richacl_create(umode_t *mode_p, struct inode *dir)
+{
+ struct richacl *dir_acl, *acl = NULL;
+
+ if (S_ISLNK(*mode_p))
+ return NULL;
+ dir_acl = get_richacl(dir);
+ if (dir_acl) {
+ if (IS_ERR(dir_acl))
+ return dir_acl;
+ acl = richacl_inherit_inode(dir_acl, mode_p);
+ richacl_put(dir_acl);
+ } else
+ *mode_p &= ~current_umask();
+ return acl;
+}
+EXPORT_SYMBOL_GPL(richacl_create);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 49d84dd..d7e10aa 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -223,9 +223,11 @@ extern unsigned int richacl_want_to_mask(unsigned int);
extern void richacl_compute_max_masks(struct richacl *);
extern struct richacl *__richacl_chmod(struct richacl *, umode_t);
extern int richacl_equiv_mode(const struct richacl *, umode_t *);
+extern struct richacl *richacl_inherit(const struct richacl *, int);
/* richacl_inode.c */
extern int richacl_permission(struct inode *, const struct richacl *, int);
extern int richacl_chmod(struct inode *, umode_t);
+extern struct richacl *richacl_create(umode_t *, struct inode *);
#endif /* __RICHACL_H */
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 18:00 +0200 |
| Subject | [PATCH v11 17/48] richacl: xattr mapping functions |
| Message-ID | <qkfAf-2um-39@gated-at.bofh.it> |
| In reply to | #1248844 |
Map between "system.richacl" xattrs and the in-kernel representation.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/Makefile | 2 +-
fs/richacl_xattr.c | 220 +++++++++++++++++++++++++++++++++++++
fs/xattr.c | 34 +++++-
include/linux/richacl_xattr.h | 42 +++++++
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/richacl_xattr.h | 44 ++++++++
include/uapi/linux/xattr.h | 2 +
7 files changed, 338 insertions(+), 7 deletions(-)
create mode 100644 fs/richacl_xattr.c
create mode 100644 include/linux/richacl_xattr.h
create mode 100644 include/uapi/linux/richacl_xattr.h
diff --git a/fs/Makefile b/fs/Makefile
index ec665fd..35e640d 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
obj-$(CONFIG_FS_RICHACL) += richacl.o
-richacl-y := richacl_base.o richacl_inode.o
+richacl-y := richacl_base.o richacl_inode.o richacl_xattr.o
obj-y += quota/
diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
new file mode 100644
index 0000000..cd9979d
--- /dev/null
+++ b/fs/richacl_xattr.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * 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; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/richacl_xattr.h>
+
+MODULE_LICENSE("GPL");
+
+/**
+ * richacl_from_xattr - convert a richacl xattr into the in-memory representation
+ */
+struct richacl *
+richacl_from_xattr(struct user_namespace *user_ns,
+ const void *value, size_t size)
+{
+ const struct richacl_xattr *xattr_acl = value;
+ const struct richace_xattr *xattr_ace = (void *)(xattr_acl + 1);
+ struct richacl *acl;
+ struct richace *ace;
+ int count;
+
+ if (size < sizeof(*xattr_acl) ||
+ xattr_acl->a_version != RICHACL_XATTR_VERSION ||
+ (xattr_acl->a_flags & ~RICHACL_VALID_FLAGS))
+ return ERR_PTR(-EINVAL);
+ size -= sizeof(*xattr_acl);
+ count = le16_to_cpu(xattr_acl->a_count);
+ if (count > RICHACL_XATTR_MAX_COUNT)
+ return ERR_PTR(-EINVAL);
+ if (size != count * sizeof(*xattr_ace))
+ return ERR_PTR(-EINVAL);
+
+ acl = richacl_alloc(count, GFP_NOFS);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+
+ acl->a_flags = xattr_acl->a_flags;
+ acl->a_owner_mask = le32_to_cpu(xattr_acl->a_owner_mask);
+ if (acl->a_owner_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+ acl->a_group_mask = le32_to_cpu(xattr_acl->a_group_mask);
+ if (acl->a_group_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+ acl->a_other_mask = le32_to_cpu(xattr_acl->a_other_mask);
+ if (acl->a_other_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+
+ richacl_for_each_entry(ace, acl) {
+ ace->e_type = le16_to_cpu(xattr_ace->e_type);
+ ace->e_flags = le16_to_cpu(xattr_ace->e_flags);
+ ace->e_mask = le32_to_cpu(xattr_ace->e_mask);
+
+ if (ace->e_flags & ~RICHACE_VALID_FLAGS)
+ goto fail_einval;
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ ace->e_id.special = le32_to_cpu(xattr_ace->e_id);
+ if (ace->e_id.special > RICHACE_EVERYONE_SPECIAL_ID)
+ goto fail_einval;
+ } else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
+ u32 id = le32_to_cpu(xattr_ace->e_id);
+
+ ace->e_id.gid = make_kgid(user_ns, id);
+ if (!gid_valid(ace->e_id.gid))
+ goto fail_einval;
+ } else {
+ u32 id = le32_to_cpu(xattr_ace->e_id);
+
+ ace->e_id.uid = make_kuid(user_ns, id);
+ if (!uid_valid(ace->e_id.uid))
+ goto fail_einval;
+ }
+ if (ace->e_type > RICHACE_ACCESS_DENIED_ACE_TYPE ||
+ (ace->e_mask & ~RICHACE_VALID_MASK))
+ goto fail_einval;
+
+ xattr_ace++;
+ }
+
+ return acl;
+
+fail_einval:
+ richacl_put(acl);
+ return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(richacl_from_xattr);
+
+/**
+ * richacl_xattr_size - compute the size of the xattr representation of @acl
+ */
+size_t
+richacl_xattr_size(const struct richacl *acl)
+{
+ size_t size = sizeof(struct richacl_xattr);
+
+ size += sizeof(struct richace_xattr) * acl->a_count;
+ return size;
+}
+EXPORT_SYMBOL_GPL(richacl_xattr_size);
+
+/**
+ * richacl_to_xattr - convert @acl into its xattr representation
+ * @acl: the richacl to convert
+ * @buffer: buffer for the result
+ * @size: size of @buffer
+ */
+int
+richacl_to_xattr(struct user_namespace *user_ns,
+ const struct richacl *acl, void *buffer, size_t size)
+{
+ struct richacl_xattr *xattr_acl = buffer;
+ struct richace_xattr *xattr_ace;
+ const struct richace *ace;
+ size_t real_size;
+
+ real_size = richacl_xattr_size(acl);
+ if (!buffer)
+ return real_size;
+ if (real_size > size)
+ return -ERANGE;
+
+ xattr_acl->a_version = RICHACL_XATTR_VERSION;
+ xattr_acl->a_flags = acl->a_flags;
+ xattr_acl->a_count = cpu_to_le16(acl->a_count);
+
+ xattr_acl->a_owner_mask = cpu_to_le32(acl->a_owner_mask);
+ xattr_acl->a_group_mask = cpu_to_le32(acl->a_group_mask);
+ xattr_acl->a_other_mask = cpu_to_le32(acl->a_other_mask);
+
+ xattr_ace = (void *)(xattr_acl + 1);
+ richacl_for_each_entry(ace, acl) {
+ xattr_ace->e_type = cpu_to_le16(ace->e_type);
+ xattr_ace->e_flags = cpu_to_le16(ace->e_flags);
+ xattr_ace->e_mask = cpu_to_le32(ace->e_mask);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO)
+ xattr_ace->e_id = cpu_to_le32(ace->e_id.special);
+ else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ xattr_ace->e_id =
+ cpu_to_le32(from_kgid(user_ns, ace->e_id.gid));
+ else
+ xattr_ace->e_id =
+ cpu_to_le32(from_kuid(user_ns, ace->e_id.uid));
+ xattr_ace++;
+ }
+ return real_size;
+}
+EXPORT_SYMBOL_GPL(richacl_to_xattr);
+
+/*
+ * Fix up the uids and gids in richacl extended attributes in place.
+ */
+static void richacl_fix_xattr_userns(
+ struct user_namespace *to, struct user_namespace *from,
+ void *value, size_t size)
+{
+ struct richacl_xattr *xattr_acl = value;
+ struct richace_xattr *xattr_ace =
+ (struct richace_xattr *)(xattr_acl + 1);
+ unsigned int count;
+
+ if (!value)
+ return;
+ if (size < sizeof(*xattr_acl))
+ return;
+ if (xattr_acl->a_version != cpu_to_le32(RICHACL_XATTR_VERSION))
+ return;
+ size -= sizeof(*xattr_acl);
+ if (size % sizeof(*xattr_ace))
+ return;
+ count = size / sizeof(*xattr_ace);
+ for (; count; count--, xattr_ace++) {
+ if (xattr_ace->e_flags & cpu_to_le16(RICHACE_SPECIAL_WHO))
+ continue;
+ if (xattr_ace->e_flags &
+ cpu_to_le16(RICHACE_IDENTIFIER_GROUP)) {
+ u32 id = le32_to_cpu(xattr_ace->e_id);
+ kgid_t gid = make_kgid(from, id);
+
+ xattr_ace->e_id = cpu_to_le32(from_kgid(to, gid));
+ } else {
+ u32 id = le32_to_cpu(xattr_ace->e_id);
+ kuid_t uid = make_kuid(from, id);
+
+ xattr_ace->e_id = cpu_to_le32(from_kuid(to, uid));
+ }
+ }
+}
+
+void richacl_fix_xattr_from_user(void *value, size_t size)
+{
+ struct user_namespace *user_ns = current_user_ns();
+
+ if (user_ns == &init_user_ns)
+ return;
+ richacl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
+}
+
+void richacl_fix_xattr_to_user(void *value, size_t size)
+{
+ struct user_namespace *user_ns = current_user_ns();
+
+ if (user_ns == &init_user_ns)
+ return;
+ richacl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
+}
diff --git a/fs/xattr.c b/fs/xattr.c
index 072fee1..f2313c6 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -21,6 +21,7 @@
#include <linux/audit.h>
#include <linux/vmalloc.h>
#include <linux/posix_acl_xattr.h>
+#include <linux/richacl_xattr.h>
#include <asm/uaccess.h>
@@ -314,6 +315,18 @@ out:
}
EXPORT_SYMBOL_GPL(vfs_removexattr);
+static void
+fix_xattr_from_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_from_user(kvalue, size);
+ else if (!strcmp(kname, XATTR_RICHACL))
+ richacl_fix_xattr_from_user(kvalue, size);
+}
/*
* Extended attribute SET operations
@@ -350,9 +363,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
error = -EFAULT;
goto out;
}
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_from_user(kvalue, size);
+ fix_xattr_from_user(kname, kvalue, size);
}
error = vfs_setxattr(d, kname, kvalue, size, flags);
@@ -419,6 +430,19 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
return error;
}
+static void
+fix_xattr_to_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_to_user(kvalue, size);
+ else if (!strcmp(kname, XATTR_RICHACL))
+ richacl_fix_xattr_to_user(kvalue, size);
+}
+
/*
* Extended attribute GET operations
*/
@@ -451,9 +475,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
error = vfs_getxattr(d, kname, kvalue, size);
if (error > 0) {
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_to_user(kvalue, size);
+ fix_xattr_to_user(kname, kvalue, size);
if (size && copy_to_user(value, kvalue, error))
error = -EFAULT;
} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
new file mode 100644
index 0000000..a088a1d
--- /dev/null
+++ b/include/linux/richacl_xattr.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * 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; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ */
+
+#ifndef __RICHACL_XATTR_H
+#define __RICHACL_XATTR_H
+
+#include <uapi/linux/richacl_xattr.h>
+#include <linux/richacl.h>
+
+extern struct richacl *richacl_from_xattr(struct user_namespace *, const void *,
+ size_t);
+extern size_t richacl_xattr_size(const struct richacl *);
+extern int richacl_to_xattr(struct user_namespace *, const struct richacl *,
+ void *, size_t);
+
+#ifdef CONFIG_FS_RICHACL
+extern void richacl_fix_xattr_from_user(void *, size_t);
+extern void richacl_fix_xattr_to_user(void *, size_t);
+#else
+static inline void richacl_fix_xattr_from_user(void *value, size_t size)
+{
+}
+
+static inline void richacl_fix_xattr_to_user(void *value, size_t size)
+{
+}
+#endif
+
+#endif /* __RICHACL_XATTR_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 8c82010..18ad070 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -349,6 +349,7 @@ header-y += reiserfs_fs.h
header-y += reiserfs_xattr.h
header-y += resource.h
header-y += richacl.h
+header-y += richacl_xattr.h
header-y += rfkill.h
header-y += romfs_fs.h
header-y += rose.h
diff --git a/include/uapi/linux/richacl_xattr.h b/include/uapi/linux/richacl_xattr.h
new file mode 100644
index 0000000..3d976a1
--- /dev/null
+++ b/include/uapi/linux/richacl_xattr.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * 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; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ */
+
+#ifndef __UAPI_RICHACL_XATTR_H
+#define __UAPI_RICHACL_XATTR_H
+
+#include <linux/types.h>
+#include <linux/xattr.h>
+
+struct richace_xattr {
+ __le16 e_type;
+ __le16 e_flags;
+ __le32 e_mask;
+ __le32 e_id;
+};
+
+struct richacl_xattr {
+ unsigned char a_version;
+ unsigned char a_flags;
+ __le16 a_count;
+ __le32 a_owner_mask;
+ __le32 a_group_mask;
+ __le32 a_other_mask;
+};
+
+#define RICHACL_XATTR_VERSION 0
+#define RICHACL_XATTR_MAX_COUNT \
+ ((XATTR_SIZE_MAX - sizeof(struct richacl_xattr)) / \
+ sizeof(struct richace_xattr))
+
+#endif /* __UAPI_RICHACL_XATTR_H */
diff --git a/include/uapi/linux/xattr.h b/include/uapi/linux/xattr.h
index 1590c49..1996903 100644
--- a/include/uapi/linux/xattr.h
+++ b/include/uapi/linux/xattr.h
@@ -73,5 +73,7 @@
#define XATTR_POSIX_ACL_DEFAULT "posix_acl_default"
#define XATTR_NAME_POSIX_ACL_DEFAULT XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_DEFAULT
+#define XATTR_RICHACL "richacl"
+#define XATTR_NAME_RICHACL XATTR_SYSTEM_PREFIX XATTR_RICHACL
#endif /* _UAPI_LINUX_XATTR_H */
--
2.5.0
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 18:10 +0200 |
| Subject | [PATCH v11 14/48] richacl: Check if an acl is equivalent to a file mode |
| Message-ID | <qkfJU-2V2-21@gated-at.bofh.it> |
| In reply to | #1248844 |
ACLs are considered equivalent to file modes if they only consist of
owner@, group@, and everyone@ entries, the owner@ permissions do not
depend on whether the owner is a member in the owning group, and no
inheritance flags are set. This test is used to avoid storing richacls
if the acl can be computed from the file permission bits.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
---
fs/richacl_base.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 1 +
2 files changed, 105 insertions(+)
diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index 764d73a..f4b8d3c 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -382,3 +382,107 @@ __richacl_chmod(struct richacl *acl, umode_t mode)
return clone;
}
EXPORT_SYMBOL_GPL(__richacl_chmod);
+
+/**
+ * richacl_equiv_mode - compute the mode equivalent of @acl
+ *
+ * An acl is considered equivalent to a file mode if it only consists of
+ * owner@, group@, and everyone@ entries and the owner@ permissions do not
+ * depend on whether the owner is a member in the owning group.
+ */
+int
+richacl_equiv_mode(const struct richacl *acl, umode_t *mode_p)
+{
+ umode_t mode = *mode_p;
+
+ /*
+ * The RICHACE_DELETE_CHILD flag is meaningless for non-directories, so
+ * we ignore it.
+ */
+ unsigned int x = S_ISDIR(mode) ? 0 : RICHACE_DELETE_CHILD;
+ struct {
+ unsigned int allowed;
+ unsigned int defined; /* allowed or denied */
+ } owner = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED |
+ RICHACE_POSIX_OWNER_ALLOWED | x,
+ }, group = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED | x,
+ }, everyone = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED | x,
+ };
+ const struct richace *ace;
+
+ if (acl->a_flags & ~(RICHACL_WRITE_THROUGH | RICHACL_MASKED))
+ return -1;
+
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_flags & ~RICHACE_SPECIAL_WHO)
+ return -1;
+
+ if (richace_is_owner(ace) || richace_is_everyone(ace)) {
+ x = ace->e_mask & ~owner.defined;
+ if (richace_is_allow(ace)) {
+ unsigned int group_denied =
+ group.defined & ~group.allowed;
+
+ if (x & group_denied)
+ return -1;
+ owner.allowed |= x;
+ } else /* if (richace_is_deny(ace)) */ {
+ if (x & group.allowed)
+ return -1;
+ }
+ owner.defined |= x;
+
+ if (richace_is_everyone(ace)) {
+ x = ace->e_mask;
+ if (richace_is_allow(ace)) {
+ group.allowed |=
+ x & ~group.defined;
+ everyone.allowed |=
+ x & ~everyone.defined;
+ }
+ group.defined |= x;
+ everyone.defined |= x;
+ }
+ } else if (richace_is_group(ace)) {
+ x = ace->e_mask & ~group.defined;
+ if (richace_is_allow(ace))
+ group.allowed |= x;
+ group.defined |= x;
+ } else
+ return -1;
+ }
+
+ if (group.allowed & ~owner.defined)
+ return -1;
+
+ if (acl->a_flags & RICHACL_MASKED) {
+ if (acl->a_flags & RICHACL_WRITE_THROUGH) {
+ owner.allowed = acl->a_owner_mask;
+ everyone.allowed = acl->a_other_mask;
+ } else {
+ owner.allowed &= acl->a_owner_mask;
+ everyone.allowed &= acl->a_other_mask;
+ }
+ group.allowed &= acl->a_group_mask;
+ }
+
+ mode = (mode & ~S_IRWXUGO) |
+ (richacl_mask_to_mode(owner.allowed) << 6) |
+ (richacl_mask_to_mode(group.allowed) << 3) |
+ richacl_mask_to_mode(everyone.allowed);
+
+ /* Mask flags we can ignore */
+ x = S_ISDIR(mode) ? 0 : RICHACE_DELETE_CHILD;
+
+ if (((richacl_mode_to_mask(mode >> 6) ^ owner.allowed) & ~x) ||
+ ((richacl_mode_to_mask(mode >> 3) ^ group.allowed) & ~x) ||
+ ((richacl_mode_to_mask(mode) ^ everyone.allowed) & ~x))
+ return -1;
+
+ *mode_p = mode;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(richacl_equiv_mode);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index e42e882..49d84dd 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -222,6 +222,7 @@ extern unsigned int richacl_mode_to_mask(umode_t);
extern unsigned int richacl_want_to_mask(unsigned int);
extern void richacl_compute_max_masks(struct richacl *);
extern struct richacl *__richacl_chmod(struct richacl *, umode_t);
+extern int richacl_equiv_mode(const struct richacl *, umode_t *);
/* richacl_inode.c */
extern int richacl_permission(struct inode *, const struct richacl *, int);
--
2.5.0
--
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| From | Andreas Gruenbacher <agruenba@redhat.com> |
|---|---|
| Date | 2015-10-16 18:10 +0200 |
| Subject | [PATCH v11 09/48] richacl: Permission check algorithm |
| Message-ID | <qkfJU-2V2-15@gated-at.bofh.it> |
| In reply to | #1248844 |
A richacl roughly grants a requested access if the NFSv4 acl in the
richacl grants the requested permissions according to the NFSv4
permission check algorithm and the file mask that applies to the process
includes the requested permissions.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: "J. Bruce Fields" <bfields@fieldses.org>
---
fs/Makefile | 2 +-
fs/richacl_inode.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 3 +
3 files changed, 153 insertions(+), 1 deletion(-)
create mode 100644 fs/richacl_inode.c
diff --git a/fs/Makefile b/fs/Makefile
index fe3e9dd..ec665fd 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
obj-$(CONFIG_FS_RICHACL) += richacl.o
-richacl-y := richacl_base.o
+richacl-y := richacl_base.o richacl_inode.o
obj-y += quota/
diff --git a/fs/richacl_inode.c b/fs/richacl_inode.c
new file mode 100644
index 0000000..5098717
--- /dev/null
+++ b/fs/richacl_inode.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * 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; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/richacl.h>
+
+/**
+ * richacl_permission - richacl permission check algorithm
+ * @inode: inode to check
+ * @acl: rich acl of the inode
+ * @want: requested access (MAY_* flags)
+ *
+ * Checks if the current process is granted @mask flags in @acl.
+ */
+int
+richacl_permission(struct inode *inode, const struct richacl *acl,
+ int want)
+{
+ const struct richace *ace;
+ unsigned int mask = richacl_want_to_mask(want);
+ unsigned int requested = mask, denied = 0;
+ int in_owning_group = in_group_p(inode->i_gid);
+ int in_owner_or_group_class = in_owning_group;
+
+ /*
+ * A process is
+ * - in the owner file class if it owns the file,
+ * - in the group file class if it is in the file's owning group or
+ * it matches any of the user or group entries, and
+ * - in the other file class otherwise.
+ * The file class is only relevant for determining which file mask to
+ * apply, which only happens for masked acls.
+ */
+ if (acl->a_flags & RICHACL_MASKED) {
+ if ((acl->a_flags & RICHACL_WRITE_THROUGH) &&
+ uid_eq(current_fsuid(), inode->i_uid)) {
+ denied = requested & ~acl->a_owner_mask;
+ goto out;
+ }
+ } else {
+ /*
+ * When the acl is not masked, there is no need to determine if
+ * the process is in the group class and we can break out
+ * earlier of the loop below.
+ */
+ in_owner_or_group_class = 1;
+ }
+
+ /*
+ * Check if the acl grants the requested access and determine which
+ * file class the process is in.
+ */
+ richacl_for_each_entry(ace, acl) {
+ unsigned int ace_mask = ace->e_mask;
+
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_owner(ace)) {
+ if (!uid_eq(current_fsuid(), inode->i_uid))
+ continue;
+ goto entry_matches_owner;
+ } else if (richace_is_group(ace)) {
+ if (!in_owning_group)
+ continue;
+ } else if (richace_is_unix_user(ace)) {
+ if (!uid_eq(current_fsuid(), ace->e_id.uid))
+ continue;
+ if (uid_eq(current_fsuid(), inode->i_uid))
+ goto entry_matches_owner;
+ } else if (richace_is_unix_group(ace)) {
+ if (!in_group_p(ace->e_id.gid))
+ continue;
+ } else
+ goto entry_matches_everyone;
+
+ /*
+ * Apply the group file mask to entries other than owner@ and
+ * everyone@ or user entries matching the owner. This ensures
+ * that we grant the same permissions as the acl computed by
+ * richacl_apply_masks().
+ *
+ * Without this restriction, the following richacl would grant
+ * rw access to processes which are both the owner and in the
+ * owning group, but not to other users in the owning group,
+ * which could not be represented without masks:
+ *
+ * owner:rw::mask
+ * group@:rw::allow
+ */
+ if ((acl->a_flags & RICHACL_MASKED) && richace_is_allow(ace))
+ ace_mask &= acl->a_group_mask;
+
+entry_matches_owner:
+ /* The process is in the owner or group file class. */
+ in_owner_or_group_class = 1;
+
+entry_matches_everyone:
+ /* Check which mask flags the ACE allows or denies. */
+ if (richace_is_deny(ace))
+ denied |= ace_mask & mask;
+ mask &= ~ace_mask;
+
+ /*
+ * Keep going until we know which file class
+ * the process is in.
+ */
+ if (!mask && in_owner_or_group_class)
+ break;
+ }
+ denied |= mask;
+
+ if (acl->a_flags & RICHACL_MASKED) {
+ /*
+ * The file class a process is in determines which file mask
+ * applies. Check if that file mask also grants the requested
+ * access.
+ */
+ if (uid_eq(current_fsuid(), inode->i_uid))
+ denied |= requested & ~acl->a_owner_mask;
+ else if (in_owner_or_group_class)
+ denied |= requested & ~acl->a_group_mask;
+ else {
+ if (acl->a_flags & RICHACL_WRITE_THROUGH)
+ denied = requested & ~acl->a_other_mask;
+ else
+ denied |= requested & ~acl->a_other_mask;
+ }
+ }
+
+out:
+ return denied ? -EACCES : 0;
+}
+EXPORT_SYMBOL_GPL(richacl_permission);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 31c5ee7..d5fa7b9 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -217,4 +217,7 @@ extern unsigned int richacl_mode_to_mask(umode_t);
extern unsigned int richacl_want_to_mask(unsigned int);
extern void richacl_compute_max_masks(struct richacl *);
+/* richacl_inode.c */
+extern int richacl_permission(struct inode *, const struct richacl *, int);
+
#endif /* __RICHACL_H */
--
2.5.0
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