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