* @inode contains the inode structure.
* Deallocate the inode security structure and set @inode->i_security to
* NULL.
+ * @inode_init_security:
+ * Obtain the security attribute name suffix and value to set on a newly
+ * created inode and set up the incore security field for the new inode.
+ * This hook is called by the fs code as part of the inode creation
+ * transaction and provides for atomic labeling of the inode, unlike
+ * the post_create/mkdir/... hooks called by the VFS. The hook function
+ * is expected to allocate the name and value via kmalloc, with the caller
+ * being responsible for calling kfree after using them.
+ * If the security module does not use security attributes or does
+ * not wish to put a security attribute on this particular inode,
+ * then it should return -EOPNOTSUPP to skip this processing.
+ * @inode contains the inode structure of the newly created inode.
+ * @dir contains the inode structure of the parent directory.
+ * @name will be set to the allocated name suffix (e.g. selinux).
+ * @value will be set to the allocated attribute value.
+ * @len will be set to the length of the value.
+ * Returns 0 if @name and @value have been successfully set,
+ * -EOPNOTSUPP if no security attribute is needed, or
+ * -ENOMEM on memory allocation failure.
* @inode_create:
* Check permission to create a regular file.
* @dir contains inode structure of the parent of the new file.
* @dentry contains the dentry structure for the file to be created.
* @mode contains the file mode of the file to be created.
* Return 0 if permission is granted.
- * @inode_post_create:
- * Set the security attributes on a newly created regular file. This hook
- * is called after a file has been successfully created.
- * @dir contains the inode structure of the parent directory of the new file.
- * @dentry contains the the dentry structure for the newly created file.
- * @mode contains the file mode.
* @inode_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.
* @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.
- * @inode_post_link:
- * Set security attributes for a new hard link to a file.
- * @old_dentry contains the dentry structure for the existing link.
- * @dir contains the inode structure of the parent directory of the new file.
- * @new_dentry contains the dentry structure for the new file link.
* @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 of the symbolic link.
* @old_name contains the pathname of file.
* Return 0 if permission is granted.
- * @inode_post_symlink:
- * @dir contains the inode structure of the parent directory of the new link.
- * @dentry contains the dentry structure of new symbolic link.
- * @old_name contains the pathname of file.
- * Set security attributes for a newly created symbolic link. Note that
- * @dentry->d_inode may be NULL, since the filesystem might not
- * instantiate the dentry (e.g. NFS).
* @inode_mkdir:
* Check permissions to create a new directory in the existing directory
* associated with inode strcture @dir.
* @dentry contains the dentry structure of new directory.
* @mode contains the mode of new directory.
* Return 0 if permission is granted.
- * @inode_post_mkdir:
- * Set security attributes on a newly created directory.
- * @dir contains the inode structure of parent of the directory to be created.
- * @dentry contains the dentry structure of new directory.
- * @mode contains the mode of new directory.
* @inode_rmdir:
* Check the permission to remove a directory.
* @dir contains the inode structure of parent of the directory to be removed.
* @mode contains the mode of the new file.
* @dev contains the the device number.
* Return 0 if permission is granted.
- * @inode_post_mknod:
- * Set security attributes on a newly created special file (or socket or
- * fifo file created via the mknod system call).
- * @dir contains the inode structure of parent of the new node.
- * @dentry contains the dentry structure of the new node.
- * @mode contains the mode of the new node.
- * @dev contains the the device number.
* @inode_rename:
* Check for permission to rename a file or directory.
* @old_dir contains the inode structure for parent of the old link.
* @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.
- * @inode_post_rename:
- * Set security attributes on a renamed file or directory.
- * @old_dir contains the inode structure for parent of the old link.
- * @old_dentry contains the dentry structure of the old link.
- * @new_dir contains the inode structure for parent of the new link.
- * @new_dentry contains the dentry structure of the new link.
* @inode_readlink:
* Check the permission to read the symbolic link.
* @dentry contains the dentry structure for the file link.
int (*inode_alloc_security) (struct inode *inode);
void (*inode_free_security) (struct inode *inode);
+ int (*inode_init_security) (struct inode *inode, struct inode *dir,
+ char **name, void **value, size_t *len);
int (*inode_create) (struct inode *dir,
struct dentry *dentry, int mode);
- void (*inode_post_create) (struct inode *dir,
- struct dentry *dentry, int mode);
int (*inode_link) (struct dentry *old_dentry,
struct inode *dir, struct dentry *new_dentry);
- void (*inode_post_link) (struct dentry *old_dentry,
- struct inode *dir, struct dentry *new_dentry);
int (*inode_unlink) (struct inode *dir, struct dentry *dentry);
int (*inode_symlink) (struct inode *dir,
struct dentry *dentry, const char *old_name);
- void (*inode_post_symlink) (struct inode *dir,
- struct dentry *dentry,
- const char *old_name);
int (*inode_mkdir) (struct inode *dir, struct dentry *dentry, int mode);
- void (*inode_post_mkdir) (struct inode *dir, struct dentry *dentry,
- int mode);
int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
int (*inode_mknod) (struct inode *dir, struct dentry *dentry,
int mode, dev_t dev);
- void (*inode_post_mknod) (struct inode *dir, struct dentry *dentry,
- int mode, dev_t dev);
int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
- void (*inode_post_rename) (struct inode *old_dir,
- struct dentry *old_dentry,
- struct inode *new_dir,
- struct dentry *new_dentry);
int (*inode_readlink) (struct dentry *dentry);
int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
int (*inode_permission) (struct inode *inode, int mask, struct nameidata *nd);
return;
security_ops->inode_free_security (inode);
}
+
+static inline int security_inode_init_security (struct inode *inode,
+ struct inode *dir,
+ char **name,
+ void **value,
+ size_t *len)
+{
+ if (unlikely (IS_PRIVATE (inode)))
+ return -EOPNOTSUPP;
+ return security_ops->inode_init_security (inode, dir, name, value, len);
+}
static inline int security_inode_create (struct inode *dir,
struct dentry *dentry,
return security_ops->inode_create (dir, dentry, mode);
}
-static inline void security_inode_post_create (struct inode *dir,
- struct dentry *dentry,
- int mode)
-{
- if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
- return;
- security_ops->inode_post_create (dir, dentry, mode);
-}
-
static inline int security_inode_link (struct dentry *old_dentry,
struct inode *dir,
struct dentry *new_dentry)
return security_ops->inode_link (old_dentry, dir, new_dentry);
}
-static inline void security_inode_post_link (struct dentry *old_dentry,
- struct inode *dir,
- struct dentry *new_dentry)
-{
- if (new_dentry->d_inode && unlikely (IS_PRIVATE (new_dentry->d_inode)))
- return;
- security_ops->inode_post_link (old_dentry, dir, new_dentry);
-}
-
static inline int security_inode_unlink (struct inode *dir,
struct dentry *dentry)
{
return security_ops->inode_symlink (dir, dentry, old_name);
}
-static inline void security_inode_post_symlink (struct inode *dir,
- struct dentry *dentry,
- const char *old_name)
-{
- if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
- return;
- security_ops->inode_post_symlink (dir, dentry, old_name);
-}
-
static inline int security_inode_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
return security_ops->inode_mkdir (dir, dentry, mode);
}
-static inline void security_inode_post_mkdir (struct inode *dir,
- struct dentry *dentry,
- int mode)
-{
- if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
- return;
- security_ops->inode_post_mkdir (dir, dentry, mode);
-}
-
static inline int security_inode_rmdir (struct inode *dir,
struct dentry *dentry)
{
return security_ops->inode_mknod (dir, dentry, mode, dev);
}
-static inline void security_inode_post_mknod (struct inode *dir,
- struct dentry *dentry,
- int mode, dev_t dev)
-{
- if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
- return;
- security_ops->inode_post_mknod (dir, dentry, mode, dev);
-}
-
static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
new_dir, new_dentry);
}
-static inline void security_inode_post_rename (struct inode *old_dir,
- struct dentry *old_dentry,
- struct inode *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;
- security_ops->inode_post_rename (old_dir, old_dentry,
- new_dir, new_dentry);
-}
-
static inline int security_inode_readlink (struct dentry *dentry)
{
if (unlikely (IS_PRIVATE (dentry->d_inode)))
extern int unregister_security (struct security_operations *ops);
extern int mod_reg_security (const char *name, struct security_operations *ops);
extern int mod_unreg_security (const char *name, struct security_operations *ops);
+ extern struct dentry *securityfs_create_file(const char *name, mode_t mode,
+ struct dentry *parent, void *data,
+ struct file_operations *fops);
+ extern struct dentry *securityfs_create_dir(const char *name, struct dentry *parent);
+ extern void securityfs_remove(struct dentry *dentry);
#else /* CONFIG_SECURITY */
static inline void security_inode_free (struct inode *inode)
{ }
+
+static inline int security_inode_init_security (struct inode *inode,
+ struct inode *dir,
+ char **name,
+ void **value,
+ size_t *len)
+{
+ return -EOPNOTSUPP;
+}
static inline int security_inode_create (struct inode *dir,
struct dentry *dentry,
return 0;
}
-static inline void security_inode_post_create (struct inode *dir,
- struct dentry *dentry,
- int mode)
-{ }
-
static inline int security_inode_link (struct dentry *old_dentry,
struct inode *dir,
struct dentry *new_dentry)
return 0;
}
-static inline void security_inode_post_link (struct dentry *old_dentry,
- struct inode *dir,
- struct dentry *new_dentry)
-{ }
-
static inline int security_inode_unlink (struct inode *dir,
struct dentry *dentry)
{
return 0;
}
-static inline void security_inode_post_symlink (struct inode *dir,
- struct dentry *dentry,
- const char *old_name)
-{ }
-
static inline int security_inode_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
return 0;
}
-static inline void security_inode_post_mkdir (struct inode *dir,
- struct dentry *dentry,
- int mode)
-{ }
-
static inline int security_inode_rmdir (struct inode *dir,
struct dentry *dentry)
{
return 0;
}
-static inline void security_inode_post_mknod (struct inode *dir,
- struct dentry *dentry,
- int mode, dev_t dev)
-{ }
-
static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
return 0;
}
-static inline void security_inode_post_rename (struct inode *old_dir,
- struct dentry *old_dentry,
- struct inode *new_dir,
- struct dentry *new_dentry)
-{ }
-
static inline int security_inode_readlink (struct dentry *dentry)
{
return 0;
return security_ops->socket_getpeersec(sock, optval, optlen, len);
}
-static inline int security_sk_alloc(struct sock *sk, int family, int priority)
+static inline int security_sk_alloc(struct sock *sk, int family,
+ unsigned int __nocast priority)
{
return security_ops->sk_alloc_security(sk, family, priority);
}
return -ENOPROTOOPT;
}
-static inline int security_sk_alloc(struct sock *sk, int family, int priority)
+static inline int security_sk_alloc(struct sock *sk, int family,
+ unsigned int __nocast priority)
{
return 0;
}
} \
} while (0)
- /**
- * kobject stuff
- */
-
- struct subsystem seclvl_subsys;
-
- struct seclvl_obj {
- char *name;
- struct list_head slot_list;
- struct kobject kobj;
- };
-
- /**
- * There is a seclvl_attribute struct for each file in sysfs.
- *
- * In our case, we have one of these structs for "passwd" and another
- * for "seclvl".
- */
- struct seclvl_attribute {
- struct attribute attr;
- ssize_t(*show) (struct seclvl_obj *, char *);
- ssize_t(*store) (struct seclvl_obj *, const char *, size_t);
- };
-
- /**
- * When this function is called, one of the files in sysfs is being
- * written to. attribute->store is a function pointer to whatever the
- * struct seclvl_attribute store function pointer points to. It is
- * unique for "passwd" and "seclvl".
- */
- static ssize_t
- seclvl_attr_store(struct kobject *kobj,
- struct attribute *attr, const char *buf, size_t len)
- {
- struct seclvl_obj *obj = container_of(kobj, struct seclvl_obj, kobj);
- struct seclvl_attribute *attribute =
- container_of(attr, struct seclvl_attribute, attr);
- return attribute->store ? attribute->store(obj, buf, len) : -EIO;
- }
-
- static ssize_t
- seclvl_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)
- {
- struct seclvl_obj *obj = container_of(kobj, struct seclvl_obj, kobj);
- struct seclvl_attribute *attribute =
- container_of(attr, struct seclvl_attribute, attr);
- return attribute->show ? attribute->show(obj, buf) : -EIO;
- }
-
- /**
- * Callback function pointers for show and store
- */
- static struct sysfs_ops seclvlfs_sysfs_ops = {
- .show = seclvl_attr_show,
- .store = seclvl_attr_store,
- };
-
- static struct kobj_type seclvl_ktype = {
- .sysfs_ops = &seclvlfs_sysfs_ops
- };
-
- decl_subsys(seclvl, &seclvl_ktype, NULL);
-
/**
* The actual security level. Ranges between -1 and 2 inclusive.
*/
return 0;
}
- /**
- * Called whenever the user reads the sysfs handle to this kernel
- * object
- */
- static ssize_t seclvl_read_file(struct seclvl_obj *obj, char *buff)
- {
- return snprintf(buff, PAGE_SIZE, "%d\n", seclvl);
- }
-
/**
* security level advancement rules:
* Valid levels are -1 through 2, inclusive.
* From -1, stuck. [ in case compiled into kernel ]
* From 0 or above, can only increment.
*/
- static int do_seclvl_advance(int newlvl)
+ static void do_seclvl_advance(void *data, u64 val)
{
- if (newlvl <= seclvl) {
- seclvl_printk(1, KERN_WARNING, "Cannot advance to seclvl "
- "[%d]\n", newlvl);
- return -EINVAL;
- }
+ int ret;
+ int newlvl = (int)val;
+
+ ret = seclvl_sanity(newlvl);
+ if (ret)
+ return;
+
if (newlvl > 2) {
seclvl_printk(1, KERN_WARNING, "Cannot advance to seclvl "
"[%d]\n", newlvl);
- return -EINVAL;
+ return;
}
if (seclvl == -1) {
seclvl_printk(1, KERN_WARNING, "Not allowed to advance to "
"seclvl [%d]\n", seclvl);
- return -EPERM;
+ return;
}
- seclvl = newlvl;
- return 0;
+ seclvl = newlvl; /* would it be more "correct" to set *data? */
+ return;
}
- /**
- * Called whenever the user writes to the sysfs handle to this kernel
- * object (seclvl/seclvl). It expects a single-digit number.
- */
- static ssize_t
- seclvl_write_file(struct seclvl_obj *obj, const char *buff, size_t count)
+ static u64 seclvl_int_get(void *data)
{
- unsigned long val;
- if (count > 2 || (count == 2 && buff[1] != '\n')) {
- seclvl_printk(1, KERN_WARNING, "Invalid value passed to "
- "seclvl: [%s]\n", buff);
- return -EINVAL;
- }
- val = buff[0] - 48;
- if (seclvl_sanity(val)) {
- seclvl_printk(1, KERN_WARNING, "Illegal secure level "
- "requested: [%d]\n", (int)val);
- return -EPERM;
- }
- if (do_seclvl_advance(val)) {
- seclvl_printk(0, KERN_ERR, "Failure advancing security level "
- "to %lu\n", val);
- }
- return count;
+ return *(int *)data;
}
- /* Generate sysfs_attr_seclvl */
- static struct seclvl_attribute sysfs_attr_seclvl =
- __ATTR(seclvl, (S_IFREG | S_IRUGO | S_IWUSR), seclvl_read_file,
- seclvl_write_file);
+ DEFINE_SIMPLE_ATTRIBUTE(seclvl_file_ops, seclvl_int_get, do_seclvl_advance, "%lld\n");
static unsigned char hashedPassword[SHA1_DIGEST_SIZE];
- /**
- * Called whenever the user reads the sysfs passwd handle.
- */
- static ssize_t seclvl_read_passwd(struct seclvl_obj *obj, char *buff)
- {
- /* So just how good *is* your password? :-) */
- char tmp[3];
- int i = 0;
- buff[0] = '\0';
- if (hideHash) {
- /* Security through obscurity */
- return 0;
- }
- while (i < SHA1_DIGEST_SIZE) {
- snprintf(tmp, 3, "%02x", hashedPassword[i]);
- strncat(buff, tmp, 2);
- i++;
- }
- strcat(buff, "\n");
- return ((SHA1_DIGEST_SIZE * 2) + 1);
- }
-
/**
* Converts a block of plaintext of into its SHA1 hashed value.
*
"bytes.\n", len, PAGE_SIZE);
return -ENOMEM;
}
- tfm = crypto_alloc_tfm("sha1", 0);
+ tfm = crypto_alloc_tfm("sha1", CRYPTO_TFM_REQ_MAY_SLEEP);
if (tfm == NULL) {
seclvl_printk(0, KERN_ERR,
"Failed to load transform for SHA1\n");
* object. It hashes the password and compares the hashed results.
*/
static ssize_t
- seclvl_write_passwd(struct seclvl_obj *obj, const char *buff, size_t count)
+ passwd_write_file(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
{
int i;
unsigned char tmp[SHA1_DIGEST_SIZE];
+ char *page;
int rc;
int len;
+
if (!*passwd && !*sha1_passwd) {
seclvl_printk(0, KERN_ERR, "Attempt to password-unlock the "
"seclvl module, but neither a plain text "
"maintainer about this event.\n");
return -EINVAL;
}
- len = strlen(buff);
+
+ if (count < 0 || count >= PAGE_SIZE)
+ return -ENOMEM;
+ if (*ppos != 0) {
+ return -EINVAL;
+ }
+ page = (char *)get_zeroed_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+ len = -EFAULT;
+ if (copy_from_user(page, buf, count))
+ goto out;
+
+ len = strlen(page);
/* ``echo "secret" > seclvl/passwd'' includes a newline */
- if (buff[len - 1] == '\n') {
+ if (page[len - 1] == '\n') {
len--;
}
/* Hash the password, then compare the hashed values */
- if ((rc = plaintext_to_sha1(tmp, buff, len))) {
+ if ((rc = plaintext_to_sha1(tmp, page, len))) {
seclvl_printk(0, KERN_ERR, "Error hashing password: rc = "
"[%d]\n", rc);
return rc;
seclvl_printk(0, KERN_INFO,
"Password accepted; seclvl reduced to 0.\n");
seclvl = 0;
- return count;
+ len = count;
+
+ out:
+ free_page((unsigned long)page);
+ return len;
}
- /* Generate sysfs_attr_passwd */
- static struct seclvl_attribute sysfs_attr_passwd =
- __ATTR(passwd, (S_IFREG | S_IRUGO | S_IWUSR), seclvl_read_passwd,
- seclvl_write_passwd);
+ static struct file_operations passwd_file_ops = {
+ .write = passwd_write_file,
+ };
/**
* Explicitely disallow ptrace'ing the init process.
}
/**
- * Sysfs registrations
+ * securityfs registrations
*/
- static int doSysfsRegistrations(void)
+ struct dentry *dir_ino, *seclvl_ino, *passwd_ino;
+
+ static int seclvlfs_register(void)
{
- int rc = 0;
- if ((rc = subsystem_register(&seclvl_subsys))) {
- seclvl_printk(0, KERN_WARNING,
- "Error [%d] registering seclvl subsystem\n", rc);
- return rc;
- }
- sysfs_create_file(&seclvl_subsys.kset.kobj, &sysfs_attr_seclvl.attr);
+ dir_ino = securityfs_create_dir("seclvl", NULL);
+ if (!dir_ino)
+ return -EFAULT;
+
+ seclvl_ino = securityfs_create_file("seclvl", S_IRUGO | S_IWUSR,
+ dir_ino, &seclvl, &seclvl_file_ops);
+ if (!seclvl_ino)
+ goto out_deldir;
if (*passwd || *sha1_passwd) {
- sysfs_create_file(&seclvl_subsys.kset.kobj,
- &sysfs_attr_passwd.attr);
+ passwd_ino = securityfs_create_file("passwd", S_IRUGO | S_IWUSR,
+ dir_ino, NULL, &passwd_file_ops);
+ if (!passwd_ino)
+ goto out_delf;
}
return 0;
+
+ out_deldir:
+ securityfs_remove(dir_ino);
+ out_delf:
+ securityfs_remove(seclvl_ino);
+
+ return -EFAULT;
}
/**
rc = -EINVAL;
goto exit;
}
- sysfs_attr_seclvl.attr.owner = THIS_MODULE;
- sysfs_attr_passwd.attr.owner = THIS_MODULE;
if (initlvl < -1 || initlvl > 2) {
seclvl_printk(0, KERN_ERR, "Error: bad initial securelevel "
"[%d].\n", initlvl);
} /* if primary module registered */
secondary = 1;
} /* if we registered ourselves with the security framework */
- if ((rc = doSysfsRegistrations())) {
+ if ((rc = seclvlfs_register())) {
seclvl_printk(0, KERN_ERR, "Error registering with sysfs\n");
goto exit;
}
*/
static void __exit seclvl_exit(void)
{
- sysfs_remove_file(&seclvl_subsys.kset.kobj, &sysfs_attr_seclvl.attr);
+ securityfs_remove(seclvl_ino);
if (*passwd || *sha1_passwd) {
- sysfs_remove_file(&seclvl_subsys.kset.kobj,
- &sysfs_attr_passwd.attr);
+ securityfs_remove(passwd_ino);
}
- subsystem_unregister(&seclvl_subsys);
+ securityfs_remove(dir_ino);
if (secondary == 1) {
mod_unreg_security(MY_NAME, &seclvl_ops);
} else if (unregister_security(&seclvl_ops)) {
projects / karo-tx-linux.git / commitdiff