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authorKentaro Takeda <takedakn@nttdata.co.jp>2008-12-17 13:24:15 +0900
committerAl Viro <viro@zeniv.linux.org.uk>2008-12-31 18:07:37 -0500
commitbe6d3e56a6b9b3a4ee44a0685e39e595073c6f0d (patch)
tree3a770f4cc676efeba443b28caa1ad195eeff49bc
parent6a94cb73064c952255336cc57731904174b2c58f (diff)
downloadlinaro-lsk-be6d3e56a6b9b3a4ee44a0685e39e595073c6f0d.tar.gz
introduce new LSM hooks where vfsmount is available.
Add new LSM hooks for path-based checks. Call them on directory-modifying operations at the points where we still know the vfsmount involved. Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/namei.c36
-rw-r--r--fs/open.c5
-rw-r--r--include/linux/security.h137
-rw-r--r--net/unix/af_unix.c4
-rw-r--r--security/Kconfig9
-rw-r--r--security/capability.c57
-rw-r--r--security/security.c66
7 files changed, 314 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index af3783fff1d..ab441af4196 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1556,6 +1556,9 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
* Refuse to truncate files with mandatory locks held on them.
*/
error = locks_verify_locked(inode);
+ if (!error)
+ error = security_path_truncate(&nd->path, 0,
+ ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
if (!error) {
DQUOT_INIT(inode);
@@ -1586,7 +1589,11 @@ static int __open_namei_create(struct nameidata *nd, struct path *path,
if (!IS_POSIXACL(dir->d_inode))
mode &= ~current->fs->umask;
+ error = security_path_mknod(&nd->path, path->dentry, mode, 0);
+ if (error)
+ goto out_unlock;
error = vfs_create(dir->d_inode, path->dentry, mode, nd);
+out_unlock:
mutex_unlock(&dir->d_inode->i_mutex);
dput(nd->path.dentry);
nd->path.dentry = path->dentry;
@@ -1999,6 +2006,9 @@ asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_mknod(&nd.path, dentry, mode, dev);
+ if (error)
+ goto out_drop_write;
switch (mode & S_IFMT) {
case 0: case S_IFREG:
error = vfs_create(nd.path.dentry->d_inode,dentry,mode,&nd);
@@ -2011,6 +2021,7 @@ asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
error = vfs_mknod(nd.path.dentry->d_inode,dentry,mode,0);
break;
}
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2070,7 +2081,11 @@ asmlinkage long sys_mkdirat(int dfd, const char __user *pathname, int mode)
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_mkdir(&nd.path, dentry, mode);
+ if (error)
+ goto out_drop_write;
error = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2180,7 +2195,11 @@ static long do_rmdir(int dfd, const char __user *pathname)
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit3;
+ error = security_path_rmdir(&nd.path, dentry);
+ if (error)
+ goto exit4;
error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+exit4:
mnt_drop_write(nd.path.mnt);
exit3:
dput(dentry);
@@ -2265,7 +2284,11 @@ static long do_unlinkat(int dfd, const char __user *pathname)
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit2;
+ error = security_path_unlink(&nd.path, dentry);
+ if (error)
+ goto exit3;
error = vfs_unlink(nd.path.dentry->d_inode, dentry);
+exit3:
mnt_drop_write(nd.path.mnt);
exit2:
dput(dentry);
@@ -2346,7 +2369,11 @@ asmlinkage long sys_symlinkat(const char __user *oldname,
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_symlink(&nd.path, dentry, from);
+ if (error)
+ goto out_drop_write;
error = vfs_symlink(nd.path.dentry->d_inode, dentry, from);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2443,7 +2470,11 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_link(old_path.dentry, &nd.path, new_dentry);
+ if (error)
+ goto out_drop_write;
error = vfs_link(old_path.dentry, nd.path.dentry->d_inode, new_dentry);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(new_dentry);
@@ -2679,8 +2710,13 @@ asmlinkage long sys_renameat(int olddfd, const char __user *oldname,
error = mnt_want_write(oldnd.path.mnt);
if (error)
goto exit5;
+ error = security_path_rename(&oldnd.path, old_dentry,
+ &newnd.path, new_dentry);
+ if (error)
+ goto exit6;
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
+exit6:
mnt_drop_write(oldnd.path.mnt);
exit5:
dput(new_dentry);
diff --git a/fs/open.c b/fs/open.c
index c0a426d5766..1cd7d40e999 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -272,6 +272,8 @@ static long do_sys_truncate(const char __user *pathname, loff_t length)
goto put_write_and_out;
error = locks_verify_truncate(inode, NULL, length);
+ if (!error)
+ error = security_path_truncate(&path, length, 0);
if (!error) {
DQUOT_INIT(inode);
error = do_truncate(path.dentry, length, 0, NULL);
@@ -329,6 +331,9 @@ static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
error = locks_verify_truncate(inode, file, length);
if (!error)
+ error = security_path_truncate(&file->f_path, length,
+ ATTR_MTIME|ATTR_CTIME);
+ if (!error)
error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
out_putf:
fput(file);
diff --git a/include/linux/security.h b/include/linux/security.h
index 3416cb85e77..b92b5e453f6 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -335,17 +335,37 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @dir contains the inode structure of the parent directory of the new link.
* @new_dentry contains the dentry structure for the new link.
* Return 0 if permission is granted.
+ * @path_link:
+ * Check permission before creating a new hard link to a file.
+ * @old_dentry contains the dentry structure for an existing link
+ * to the file.
+ * @new_dir contains the path structure of the parent directory of
+ * the new link.
+ * @new_dentry contains the dentry structure for the new link.
+ * Return 0 if permission is granted.
* @inode_unlink:
* Check the permission to remove a hard link to a file.
* @dir contains the inode structure of parent directory of the file.
* @dentry contains the dentry structure for file to be unlinked.
* Return 0 if permission is granted.
+ * @path_unlink:
+ * Check the permission to remove a hard link to a file.
+ * @dir contains the path structure of parent directory of the file.
+ * @dentry contains the dentry structure for file to be unlinked.
+ * Return 0 if permission is granted.
* @inode_symlink:
* Check the permission to create a symbolic link to a file.
* @dir contains the inode structure of parent directory of the symbolic link.
* @dentry contains the dentry structure of the symbolic link.
* @old_name contains the pathname of file.
* Return 0 if permission is granted.
+ * @path_symlink:
+ * Check the permission to create a symbolic link to a file.
+ * @dir contains the path structure of parent directory of
+ * the symbolic link.
+ * @dentry contains the dentry structure of the symbolic link.
+ * @old_name contains the pathname of file.
+ * Return 0 if permission is granted.
* @inode_mkdir:
* Check permissions to create a new directory in the existing directory
* associated with inode strcture @dir.
@@ -353,11 +373,25 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @dentry contains the dentry structure of new directory.
* @mode contains the mode of new directory.
* Return 0 if permission is granted.
+ * @path_mkdir:
+ * Check permissions to create a new directory in the existing directory
+ * associated with path strcture @path.
+ * @dir containst the path structure of parent of the directory
+ * to be created.
+ * @dentry contains the dentry structure of new directory.
+ * @mode contains the mode of new directory.
+ * Return 0 if permission is granted.
* @inode_rmdir:
* Check the permission to remove a directory.
* @dir contains the inode structure of parent of the directory to be removed.
* @dentry contains the dentry structure of directory to be removed.
* Return 0 if permission is granted.
+ * @path_rmdir:
+ * Check the permission to remove a directory.
+ * @dir contains the path structure of parent of the directory to be
+ * removed.
+ * @dentry contains the dentry structure of directory to be removed.
+ * Return 0 if permission is granted.
* @inode_mknod:
* Check permissions when creating a special file (or a socket or a fifo
* file created via the mknod system call). Note that if mknod operation
@@ -368,6 +402,15 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @mode contains the mode of the new file.
* @dev contains the device number.
* Return 0 if permission is granted.
+ * @path_mknod:
+ * Check permissions when creating a file. Note that this hook is called
+ * even if mknod operation is being done for a regular file.
+ * @dir contains the path structure of parent of the new file.
+ * @dentry contains the dentry structure of the new file.
+ * @mode contains the mode of the new file.
+ * @dev contains the undecoded device number. Use new_decode_dev() to get
+ * the decoded device number.
+ * Return 0 if permission is granted.
* @inode_rename:
* Check for permission to rename a file or directory.
* @old_dir contains the inode structure for parent of the old link.
@@ -375,6 +418,13 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @new_dir contains the inode structure for parent of the new link.
* @new_dentry contains the dentry structure of the new link.
* Return 0 if permission is granted.
+ * @path_rename:
+ * Check for permission to rename a file or directory.
+ * @old_dir contains the path structure for parent of the old link.
+ * @old_dentry contains the dentry structure of the old link.
+ * @new_dir contains the path structure for parent of the new link.
+ * @new_dentry contains the dentry structure of the new link.
+ * Return 0 if permission is granted.
* @inode_readlink:
* Check the permission to read the symbolic link.
* @dentry contains the dentry structure for the file link.
@@ -403,6 +453,12 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @dentry contains the dentry structure for the file.
* @attr is the iattr structure containing the new file attributes.
* Return 0 if permission is granted.
+ * @path_truncate:
+ * Check permission before truncating a file.
+ * @path contains the path structure for the file.
+ * @length is the new length of the file.
+ * @time_attrs is the flags passed to do_truncate().
+ * Return 0 if permission is granted.
* @inode_getattr:
* Check permission before obtaining file attributes.
* @mnt is the vfsmount where the dentry was looked up
@@ -1331,6 +1387,22 @@ struct security_operations {
struct super_block *newsb);
int (*sb_parse_opts_str) (char *options, struct security_mnt_opts *opts);
+#ifdef CONFIG_SECURITY_PATH
+ int (*path_unlink) (struct path *dir, struct dentry *dentry);
+ int (*path_mkdir) (struct path *dir, struct dentry *dentry, int mode);
+ int (*path_rmdir) (struct path *dir, struct dentry *dentry);
+ int (*path_mknod) (struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev);
+ int (*path_truncate) (struct path *path, loff_t length,
+ unsigned int time_attrs);
+ int (*path_symlink) (struct path *dir, struct dentry *dentry,
+ const char *old_name);
+ int (*path_link) (struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry);
+ int (*path_rename) (struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry);
+#endif
+
int (*inode_alloc_security) (struct inode *inode);
void (*inode_free_security) (struct inode *inode);
int (*inode_init_security) (struct inode *inode, struct inode *dir,
@@ -2705,6 +2777,71 @@ static inline void security_skb_classify_flow(struct sk_buff *skb, struct flowi
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
+#ifdef CONFIG_SECURITY_PATH
+int security_path_unlink(struct path *dir, struct dentry *dentry);
+int security_path_mkdir(struct path *dir, struct dentry *dentry, int mode);
+int security_path_rmdir(struct path *dir, struct dentry *dentry);
+int security_path_mknod(struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev);
+int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs);
+int security_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name);
+int security_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry);
+int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry);
+#else /* CONFIG_SECURITY_PATH */
+static inline int security_path_unlink(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static inline int security_path_mkdir(struct path *dir, struct dentry *dentry,
+ int mode)
+{
+ return 0;
+}
+
+static inline int security_path_rmdir(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static inline int security_path_mknod(struct path *dir, struct dentry *dentry,
+ int mode, unsigned int dev)
+{
+ return 0;
+}
+
+static inline int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs)
+{
+ return 0;
+}
+
+static inline int security_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name)
+{
+ return 0;
+}
+
+static inline int security_path_link(struct dentry *old_dentry,
+ struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static inline int security_path_rename(struct path *old_dir,
+ struct dentry *old_dentry,
+ struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+#endif /* CONFIG_SECURITY_PATH */
+
#ifdef CONFIG_KEYS
#ifdef CONFIG_SECURITY
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index c6250d0055d..d1b89820ab4 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -836,7 +836,11 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
err = mnt_want_write(nd.path.mnt);
if (err)
goto out_mknod_dput;
+ err = security_path_mknod(&nd.path, dentry, mode, 0);
+ if (err)
+ goto out_mknod_drop_write;
err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0);
+out_mknod_drop_write:
mnt_drop_write(nd.path.mnt);
if (err)
goto out_mknod_dput;
diff --git a/security/Kconfig b/security/Kconfig
index d9f47ce7e20..9438535d7fd 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -81,6 +81,15 @@ config SECURITY_NETWORK_XFRM
IPSec.
If you are unsure how to answer this question, answer N.
+config SECURITY_PATH
+ bool "Security hooks for pathname based access control"
+ depends on SECURITY
+ help
+ This enables the security hooks for pathname based access control.
+ If enabled, a security module can use these hooks to
+ implement pathname based access controls.
+ If you are unsure how to answer this question, answer N.
+
config SECURITY_FILE_CAPABILITIES
bool "File POSIX Capabilities"
default n
diff --git a/security/capability.c b/security/capability.c
index 2dce66fcb99..c545bd1300b 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -263,6 +263,53 @@ static void cap_inode_getsecid(const struct inode *inode, u32 *secid)
*secid = 0;
}
+#ifdef CONFIG_SECURITY_PATH
+static int cap_path_mknod(struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev)
+{
+ return 0;
+}
+
+static int cap_path_mkdir(struct path *dir, struct dentry *dentry, int mode)
+{
+ return 0;
+}
+
+static int cap_path_rmdir(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static int cap_path_unlink(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static int cap_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name)
+{
+ return 0;
+}
+
+static int cap_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static int cap_path_rename(struct path *old_path, struct dentry *old_dentry,
+ struct path *new_path, struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static int cap_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs)
+{
+ return 0;
+}
+#endif
+
static int cap_file_permission(struct file *file, int mask)
{
return 0;
@@ -883,6 +930,16 @@ void security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, inode_setsecurity);
set_to_cap_if_null(ops, inode_listsecurity);
set_to_cap_if_null(ops, inode_getsecid);
+#ifdef CONFIG_SECURITY_PATH
+ set_to_cap_if_null(ops, path_mknod);
+ set_to_cap_if_null(ops, path_mkdir);
+ set_to_cap_if_null(ops, path_rmdir);
+ set_to_cap_if_null(ops, path_unlink);
+ set_to_cap_if_null(ops, path_symlink);
+ set_to_cap_if_null(ops, path_link);
+ set_to_cap_if_null(ops, path_rename);
+ set_to_cap_if_null(ops, path_truncate);
+#endif
set_to_cap_if_null(ops, file_permission);
set_to_cap_if_null(ops, file_alloc_security);
set_to_cap_if_null(ops, file_free_security);
diff --git a/security/security.c b/security/security.c
index d85dbb37c97..678d4d07b85 100644
--- a/security/security.c
+++ b/security/security.c
@@ -355,6 +355,72 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
}
EXPORT_SYMBOL(security_inode_init_security);
+#ifdef CONFIG_SECURITY_PATH
+int security_path_mknod(struct path *path, struct dentry *dentry, int mode,
+ unsigned int dev)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_mknod(path, dentry, mode, dev);
+}
+EXPORT_SYMBOL(security_path_mknod);
+
+int security_path_mkdir(struct path *path, struct dentry *dentry, int mode)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_mkdir(path, dentry, mode);
+}
+
+int security_path_rmdir(struct path *path, struct dentry *dentry)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_rmdir(path, dentry);
+}
+
+int security_path_unlink(struct path *path, struct dentry *dentry)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_unlink(path, dentry);
+}
+
+int security_path_symlink(struct path *path, struct dentry *dentry,
+ const char *old_name)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_symlink(path, dentry, old_name);
+}
+
+int security_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
+ return 0;
+ return security_ops->path_link(old_dentry, new_dir, new_dentry);
+}
+
+int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry)
+{
+ if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
+ (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
+ return 0;
+ return security_ops->path_rename(old_dir, old_dentry, new_dir,
+ new_dentry);
+}
+
+int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs)
+{
+ if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+ return 0;
+ return security_ops->path_truncate(path, length, time_attrs);
+}
+#endif
+
int security_inode_create(struct inode *dir, struct dentry *dentry, int mode)
{
if (unlikely(IS_PRIVATE(dir)))