2 * security/tomoyo/tomoyo.c
4 * LSM hooks for TOMOYO Linux.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
9 #include <linux/security.h>
12 static int tomoyo_cred_alloc_blank(struct cred
*new, gfp_t gfp
)
18 static int tomoyo_cred_prepare(struct cred
*new, const struct cred
*old
,
21 struct tomoyo_domain_info
*domain
= old
->security
;
22 new->security
= domain
;
24 atomic_inc(&domain
->users
);
28 static void tomoyo_cred_transfer(struct cred
*new, const struct cred
*old
)
30 tomoyo_cred_prepare(new, old
, 0);
33 static void tomoyo_cred_free(struct cred
*cred
)
35 struct tomoyo_domain_info
*domain
= cred
->security
;
37 atomic_dec(&domain
->users
);
40 static int tomoyo_bprm_set_creds(struct linux_binprm
*bprm
)
44 rc
= cap_bprm_set_creds(bprm
);
49 * Do only if this function is called for the first time of an execve
52 if (bprm
->cred_prepared
)
54 #ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
56 * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
59 if (!tomoyo_policy_loaded
)
60 tomoyo_load_policy(bprm
->filename
);
63 * Release reference to "struct tomoyo_domain_info" stored inside
64 * "bprm->cred->security". New reference to "struct tomoyo_domain_info"
65 * stored inside "bprm->cred->security" will be acquired later inside
66 * tomoyo_find_next_domain().
68 atomic_dec(&((struct tomoyo_domain_info
*)
69 bprm
->cred
->security
)->users
);
71 * Tell tomoyo_bprm_check_security() is called for the first time of an
74 bprm
->cred
->security
= NULL
;
78 static int tomoyo_bprm_check_security(struct linux_binprm
*bprm
)
80 struct tomoyo_domain_info
*domain
= bprm
->cred
->security
;
83 * Execute permission is checked against pathname passed to do_execve()
84 * using current domain.
87 const int idx
= tomoyo_read_lock();
88 const int err
= tomoyo_find_next_domain(bprm
);
89 tomoyo_read_unlock(idx
);
93 * Read permission is checked against interpreters using next domain.
95 return tomoyo_check_open_permission(domain
, &bprm
->file
->f_path
, O_RDONLY
);
98 static int tomoyo_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
100 struct path path
= { mnt
, dentry
};
101 return tomoyo_path_perm(TOMOYO_TYPE_GETATTR
, &path
);
104 static int tomoyo_path_truncate(struct path
*path
)
106 return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE
, path
);
109 static int tomoyo_path_unlink(struct path
*parent
, struct dentry
*dentry
)
111 struct path path
= { parent
->mnt
, dentry
};
112 return tomoyo_path_perm(TOMOYO_TYPE_UNLINK
, &path
);
115 static int tomoyo_path_mkdir(struct path
*parent
, struct dentry
*dentry
,
118 struct path path
= { parent
->mnt
, dentry
};
119 return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR
, &path
,
123 static int tomoyo_path_rmdir(struct path
*parent
, struct dentry
*dentry
)
125 struct path path
= { parent
->mnt
, dentry
};
126 return tomoyo_path_perm(TOMOYO_TYPE_RMDIR
, &path
);
129 static int tomoyo_path_symlink(struct path
*parent
, struct dentry
*dentry
,
130 const char *old_name
)
132 struct path path
= { parent
->mnt
, dentry
};
133 return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK
, &path
);
136 static int tomoyo_path_mknod(struct path
*parent
, struct dentry
*dentry
,
137 int mode
, unsigned int dev
)
139 struct path path
= { parent
->mnt
, dentry
};
140 int type
= TOMOYO_TYPE_CREATE
;
141 const unsigned int perm
= mode
& S_IALLUGO
;
143 switch (mode
& S_IFMT
) {
145 type
= TOMOYO_TYPE_MKCHAR
;
148 type
= TOMOYO_TYPE_MKBLOCK
;
153 return tomoyo_mkdev_perm(type
, &path
, perm
, dev
);
155 switch (mode
& S_IFMT
) {
157 type
= TOMOYO_TYPE_MKFIFO
;
160 type
= TOMOYO_TYPE_MKSOCK
;
163 return tomoyo_path_number_perm(type
, &path
, perm
);
166 static int tomoyo_path_link(struct dentry
*old_dentry
, struct path
*new_dir
,
167 struct dentry
*new_dentry
)
169 struct path path1
= { new_dir
->mnt
, old_dentry
};
170 struct path path2
= { new_dir
->mnt
, new_dentry
};
171 return tomoyo_path2_perm(TOMOYO_TYPE_LINK
, &path1
, &path2
);
174 static int tomoyo_path_rename(struct path
*old_parent
,
175 struct dentry
*old_dentry
,
176 struct path
*new_parent
,
177 struct dentry
*new_dentry
)
179 struct path path1
= { old_parent
->mnt
, old_dentry
};
180 struct path path2
= { new_parent
->mnt
, new_dentry
};
181 return tomoyo_path2_perm(TOMOYO_TYPE_RENAME
, &path1
, &path2
);
184 static int tomoyo_file_fcntl(struct file
*file
, unsigned int cmd
,
187 if (!(cmd
== F_SETFL
&& ((arg
^ file
->f_flags
) & O_APPEND
)))
189 return tomoyo_check_open_permission(tomoyo_domain(), &file
->f_path
,
190 O_WRONLY
| (arg
& O_APPEND
));
193 static int tomoyo_dentry_open(struct file
*f
, const struct cred
*cred
)
195 int flags
= f
->f_flags
;
196 /* Don't check read permission here if called from do_execve(). */
197 if (current
->in_execve
)
199 return tomoyo_check_open_permission(tomoyo_domain(), &f
->f_path
, flags
);
202 static int tomoyo_file_ioctl(struct file
*file
, unsigned int cmd
,
205 return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL
, &file
->f_path
, cmd
);
208 static int tomoyo_path_chmod(struct dentry
*dentry
, struct vfsmount
*mnt
,
211 struct path path
= { mnt
, dentry
};
212 return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD
, &path
,
216 static int tomoyo_path_chown(struct path
*path
, uid_t uid
, gid_t gid
)
219 if (uid
!= (uid_t
) -1)
220 error
= tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN
, path
, uid
);
221 if (!error
&& gid
!= (gid_t
) -1)
222 error
= tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP
, path
, gid
);
226 static int tomoyo_path_chroot(struct path
*path
)
228 return tomoyo_path_perm(TOMOYO_TYPE_CHROOT
, path
);
231 static int tomoyo_sb_mount(char *dev_name
, struct path
*path
,
232 char *type
, unsigned long flags
, void *data
)
234 return tomoyo_mount_permission(dev_name
, path
, type
, flags
, data
);
237 static int tomoyo_sb_umount(struct vfsmount
*mnt
, int flags
)
239 struct path path
= { mnt
, mnt
->mnt_root
};
240 return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT
, &path
);
243 static int tomoyo_sb_pivotroot(struct path
*old_path
, struct path
*new_path
)
245 return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT
, new_path
, old_path
);
249 * tomoyo_security_ops is a "struct security_operations" which is used for
250 * registering TOMOYO.
252 static struct security_operations tomoyo_security_ops
= {
254 .cred_alloc_blank
= tomoyo_cred_alloc_blank
,
255 .cred_prepare
= tomoyo_cred_prepare
,
256 .cred_transfer
= tomoyo_cred_transfer
,
257 .cred_free
= tomoyo_cred_free
,
258 .bprm_set_creds
= tomoyo_bprm_set_creds
,
259 .bprm_check_security
= tomoyo_bprm_check_security
,
260 .file_fcntl
= tomoyo_file_fcntl
,
261 .dentry_open
= tomoyo_dentry_open
,
262 .path_truncate
= tomoyo_path_truncate
,
263 .path_unlink
= tomoyo_path_unlink
,
264 .path_mkdir
= tomoyo_path_mkdir
,
265 .path_rmdir
= tomoyo_path_rmdir
,
266 .path_symlink
= tomoyo_path_symlink
,
267 .path_mknod
= tomoyo_path_mknod
,
268 .path_link
= tomoyo_path_link
,
269 .path_rename
= tomoyo_path_rename
,
270 .inode_getattr
= tomoyo_inode_getattr
,
271 .file_ioctl
= tomoyo_file_ioctl
,
272 .path_chmod
= tomoyo_path_chmod
,
273 .path_chown
= tomoyo_path_chown
,
274 .path_chroot
= tomoyo_path_chroot
,
275 .sb_mount
= tomoyo_sb_mount
,
276 .sb_umount
= tomoyo_sb_umount
,
277 .sb_pivotroot
= tomoyo_sb_pivotroot
,
281 struct srcu_struct tomoyo_ss
;
283 static int __init
tomoyo_init(void)
285 struct cred
*cred
= (struct cred
*) current_cred();
287 if (!security_module_enable(&tomoyo_security_ops
))
289 /* register ourselves with the security framework */
290 if (register_security(&tomoyo_security_ops
) ||
291 init_srcu_struct(&tomoyo_ss
))
292 panic("Failure registering TOMOYO Linux");
293 printk(KERN_INFO
"TOMOYO Linux initialized\n");
294 cred
->security
= &tomoyo_kernel_domain
;
299 security_initcall(tomoyo_init
);