![Tetsuo Handa](/assets/img/avatar_default.png)
Gather structures and constants scattered around security/tomoyo/ directory. This is for preparation for adding garbage collector since garbage collector needs to know structures and constants which TOMOYO uses. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
309 lines
8.3 KiB
C
309 lines
8.3 KiB
C
/*
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* security/tomoyo/tomoyo.c
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*
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* LSM hooks for TOMOYO Linux.
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*
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* Copyright (C) 2005-2009 NTT DATA CORPORATION
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*
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* Version: 2.2.0 2009/04/01
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*
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*/
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#include <linux/security.h>
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#include "common.h"
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static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
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{
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new->security = NULL;
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return 0;
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}
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static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
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gfp_t gfp)
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{
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/*
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* Since "struct tomoyo_domain_info *" is a sharable pointer,
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* we don't need to duplicate.
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*/
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new->security = old->security;
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return 0;
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}
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static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
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{
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/*
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* Since "struct tomoyo_domain_info *" is a sharable pointer,
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* we don't need to duplicate.
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*/
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new->security = old->security;
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}
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static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
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{
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int rc;
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rc = cap_bprm_set_creds(bprm);
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if (rc)
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return rc;
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/*
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* Do only if this function is called for the first time of an execve
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* operation.
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*/
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if (bprm->cred_prepared)
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return 0;
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/*
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* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
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* for the first time.
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*/
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if (!tomoyo_policy_loaded)
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tomoyo_load_policy(bprm->filename);
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/*
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* Tell tomoyo_bprm_check_security() is called for the first time of an
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* execve operation.
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*/
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bprm->cred->security = NULL;
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return 0;
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}
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static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
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{
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struct tomoyo_domain_info *domain = bprm->cred->security;
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/*
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* Execute permission is checked against pathname passed to do_execve()
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* using current domain.
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*/
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if (!domain) {
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/*
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* We will need to protect whole execve() operation when GC
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* starts kfree()ing "struct tomoyo_domain_info" because
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* bprm->cred->security points to "struct tomoyo_domain_info"
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* but "struct tomoyo_domain_info" does not have a refcounter.
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*/
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const int idx = tomoyo_read_lock();
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const int err = tomoyo_find_next_domain(bprm);
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tomoyo_read_unlock(idx);
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return err;
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}
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/*
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* Read permission is checked against interpreters using next domain.
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* '1' is the result of open_to_namei_flags(O_RDONLY).
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*/
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return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1);
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}
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static int tomoyo_path_truncate(struct path *path, loff_t length,
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unsigned int time_attrs)
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{
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return tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_TRUNCATE_ACL,
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path);
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}
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static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_UNLINK_ACL,
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&path);
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}
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static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
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int mode)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_MKDIR_ACL,
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&path);
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}
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static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_RMDIR_ACL,
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&path);
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}
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static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
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const char *old_name)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_SYMLINK_ACL,
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&path);
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}
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static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
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int mode, unsigned int dev)
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{
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struct path path = { parent->mnt, dentry };
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int type = TOMOYO_TYPE_CREATE_ACL;
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switch (mode & S_IFMT) {
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case S_IFCHR:
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type = TOMOYO_TYPE_MKCHAR_ACL;
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break;
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case S_IFBLK:
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type = TOMOYO_TYPE_MKBLOCK_ACL;
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break;
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case S_IFIFO:
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type = TOMOYO_TYPE_MKFIFO_ACL;
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break;
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case S_IFSOCK:
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type = TOMOYO_TYPE_MKSOCK_ACL;
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break;
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}
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return tomoyo_check_1path_perm(tomoyo_domain(),
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type, &path);
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}
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static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
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struct dentry *new_dentry)
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{
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struct path path1 = { new_dir->mnt, old_dentry };
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struct path path2 = { new_dir->mnt, new_dentry };
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return tomoyo_check_2path_perm(tomoyo_domain(),
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TOMOYO_TYPE_LINK_ACL,
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&path1, &path2);
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}
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static int tomoyo_path_rename(struct path *old_parent,
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struct dentry *old_dentry,
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struct path *new_parent,
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struct dentry *new_dentry)
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{
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struct path path1 = { old_parent->mnt, old_dentry };
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struct path path2 = { new_parent->mnt, new_dentry };
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return tomoyo_check_2path_perm(tomoyo_domain(),
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TOMOYO_TYPE_RENAME_ACL,
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&path1, &path2);
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}
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static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))
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return tomoyo_check_rewrite_permission(tomoyo_domain(), file);
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return 0;
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}
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static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
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{
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int flags = f->f_flags;
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if ((flags + 1) & O_ACCMODE)
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flags++;
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flags |= f->f_flags & (O_APPEND | O_TRUNC);
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/* Don't check read permission here if called from do_execve(). */
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if (current->in_execve)
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return 0;
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return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
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}
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static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_IOCTL_ACL,
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&file->f_path);
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}
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static int tomoyo_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
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mode_t mode)
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{
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struct path path = { mnt, dentry };
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return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_CHMOD_ACL,
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&path);
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}
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static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
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{
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int error = 0;
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if (uid != (uid_t) -1)
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error = tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_CHOWN_ACL, path);
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if (!error && gid != (gid_t) -1)
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error = tomoyo_check_1path_perm(tomoyo_domain(),
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TOMOYO_TYPE_CHGRP_ACL, path);
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return error;
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}
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static int tomoyo_path_chroot(struct path *path)
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{
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return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_CHROOT_ACL,
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path);
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}
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static int tomoyo_sb_mount(char *dev_name, struct path *path,
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char *type, unsigned long flags, void *data)
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{
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return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_MOUNT_ACL,
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path);
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}
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static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
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{
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struct path path = { mnt, mnt->mnt_root };
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return tomoyo_check_1path_perm(tomoyo_domain(), TOMOYO_TYPE_UMOUNT_ACL,
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&path);
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}
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static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
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{
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return tomoyo_check_2path_perm(tomoyo_domain(),
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TOMOYO_TYPE_PIVOT_ROOT_ACL,
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new_path, old_path);
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}
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/*
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* tomoyo_security_ops is a "struct security_operations" which is used for
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* registering TOMOYO.
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*/
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static struct security_operations tomoyo_security_ops = {
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.name = "tomoyo",
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.cred_alloc_blank = tomoyo_cred_alloc_blank,
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.cred_prepare = tomoyo_cred_prepare,
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.cred_transfer = tomoyo_cred_transfer,
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.bprm_set_creds = tomoyo_bprm_set_creds,
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.bprm_check_security = tomoyo_bprm_check_security,
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.file_fcntl = tomoyo_file_fcntl,
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.dentry_open = tomoyo_dentry_open,
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.path_truncate = tomoyo_path_truncate,
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.path_unlink = tomoyo_path_unlink,
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.path_mkdir = tomoyo_path_mkdir,
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.path_rmdir = tomoyo_path_rmdir,
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.path_symlink = tomoyo_path_symlink,
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.path_mknod = tomoyo_path_mknod,
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.path_link = tomoyo_path_link,
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.path_rename = tomoyo_path_rename,
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.file_ioctl = tomoyo_file_ioctl,
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.path_chmod = tomoyo_path_chmod,
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.path_chown = tomoyo_path_chown,
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.path_chroot = tomoyo_path_chroot,
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.sb_mount = tomoyo_sb_mount,
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.sb_umount = tomoyo_sb_umount,
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.sb_pivotroot = tomoyo_sb_pivotroot,
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};
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/* Lock for GC. */
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struct srcu_struct tomoyo_ss;
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static int __init tomoyo_init(void)
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{
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struct cred *cred = (struct cred *) current_cred();
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if (!security_module_enable(&tomoyo_security_ops))
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return 0;
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/* register ourselves with the security framework */
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if (register_security(&tomoyo_security_ops) ||
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init_srcu_struct(&tomoyo_ss))
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panic("Failure registering TOMOYO Linux");
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printk(KERN_INFO "TOMOYO Linux initialized\n");
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cred->security = &tomoyo_kernel_domain;
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tomoyo_realpath_init();
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return 0;
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}
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security_initcall(tomoyo_init);
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