![Al Viro](/assets/img/avatar_default.png)
commit 5300990c03
had stepped on a rather
nasty mess: definitions of ACC_MODE used to be different. Fixed the
resulting breakage, converting them to variant that takes O_... value;
all callers have that and it actually simplifies life (see tomoyo part
of changes).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
231 lines
6 KiB
C
231 lines
6 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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#include "tomoyo.h"
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#include "realpath.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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return tomoyo_find_next_domain(bprm);
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/*
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* Read permission is checked against interpreters using next domain.
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*/
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return tomoyo_check_open_permission(domain, &bprm->file->f_path, O_RDONLY);
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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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/* 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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/*
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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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};
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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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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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