561 lines
15 KiB
C
561 lines
15 KiB
C
/*
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* security/tomoyo/tomoyo.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include <linux/security.h>
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#include "common.h"
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/**
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* tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
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*
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* @new: Pointer to "struct cred".
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* @gfp: Memory allocation flags.
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*
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* Returns 0.
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*/
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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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/**
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* tomoyo_cred_prepare - Target for security_prepare_creds().
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*
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* @new: Pointer to "struct cred".
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* @old: Pointer to "struct cred".
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* @gfp: Memory allocation flags.
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*
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* Returns 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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struct tomoyo_domain_info *domain = old->security;
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new->security = domain;
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if (domain)
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atomic_inc(&domain->users);
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return 0;
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}
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/**
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* tomoyo_cred_transfer - Target for security_transfer_creds().
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*
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* @new: Pointer to "struct cred".
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* @old: Pointer to "struct cred".
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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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tomoyo_cred_prepare(new, old, 0);
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}
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/**
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* tomoyo_cred_free - Target for security_cred_free().
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*
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* @cred: Pointer to "struct cred".
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*/
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static void tomoyo_cred_free(struct cred *cred)
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{
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struct tomoyo_domain_info *domain = cred->security;
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if (domain)
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atomic_dec(&domain->users);
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}
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/**
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* tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
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*
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* @bprm: Pointer to "struct linux_binprm".
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*
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* Returns 0 on success, negative value otherwise.
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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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#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
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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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#endif
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/*
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* Release reference to "struct tomoyo_domain_info" stored inside
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* "bprm->cred->security". New reference to "struct tomoyo_domain_info"
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* stored inside "bprm->cred->security" will be acquired later inside
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* tomoyo_find_next_domain().
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*/
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atomic_dec(&((struct tomoyo_domain_info *)
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bprm->cred->security)->users);
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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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/**
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* tomoyo_bprm_check_security - Target for security_bprm_check().
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*
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* @bprm: Pointer to "struct linux_binprm".
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*
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* Returns 0 on success, negative value otherwise.
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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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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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*/
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return tomoyo_check_open_permission(domain, &bprm->file->f_path,
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O_RDONLY);
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}
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/**
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* tomoyo_inode_getattr - Target for security_inode_getattr().
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*
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* @mnt: Pointer to "struct vfsmount".
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* @dentry: Pointer to "struct dentry".
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
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{
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struct path path = { mnt, dentry };
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return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
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}
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/**
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* tomoyo_path_truncate - Target for security_path_truncate().
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*
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* @path: Pointer to "struct path".
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_path_truncate(struct path *path)
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{
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return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
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}
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/**
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* tomoyo_path_unlink - Target for security_path_unlink().
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*
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* @parent: Pointer to "struct path".
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* @dentry: Pointer to "struct dentry".
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*
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* Returns 0 on success, negative value otherwise.
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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_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
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}
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/**
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* tomoyo_path_mkdir - Target for security_path_mkdir().
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*
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* @parent: Pointer to "struct path".
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* @dentry: Pointer to "struct dentry".
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* @mode: DAC permission mode.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
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umode_t mode)
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{
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struct path path = { parent->mnt, dentry };
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return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
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mode & S_IALLUGO);
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}
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/**
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* tomoyo_path_rmdir - Target for security_path_rmdir().
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*
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* @parent: Pointer to "struct path".
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* @dentry: Pointer to "struct dentry".
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*
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* Returns 0 on success, negative value otherwise.
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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_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
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}
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/**
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* tomoyo_path_symlink - Target for security_path_symlink().
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*
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* @parent: Pointer to "struct path".
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* @dentry: Pointer to "struct dentry".
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* @old_name: Symlink's content.
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*
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* Returns 0 on success, negative value otherwise.
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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_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
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}
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/**
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* tomoyo_path_mknod - Target for security_path_mknod().
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*
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* @parent: Pointer to "struct path".
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* @dentry: Pointer to "struct dentry".
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* @mode: DAC permission mode.
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* @dev: Device attributes.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
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umode_t 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;
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const unsigned int perm = mode & S_IALLUGO;
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switch (mode & S_IFMT) {
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case S_IFCHR:
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type = TOMOYO_TYPE_MKCHAR;
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break;
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case S_IFBLK:
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type = TOMOYO_TYPE_MKBLOCK;
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break;
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default:
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goto no_dev;
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}
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return tomoyo_mkdev_perm(type, &path, perm, dev);
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no_dev:
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switch (mode & S_IFMT) {
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case S_IFIFO:
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type = TOMOYO_TYPE_MKFIFO;
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break;
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case S_IFSOCK:
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type = TOMOYO_TYPE_MKSOCK;
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break;
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}
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return tomoyo_path_number_perm(type, &path, perm);
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}
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/**
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* tomoyo_path_link - Target for security_path_link().
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*
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* @old_dentry: Pointer to "struct dentry".
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* @new_dir: Pointer to "struct path".
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* @new_dentry: Pointer to "struct dentry".
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*
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* Returns 0 on success, negative value otherwise.
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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_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
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}
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/**
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* tomoyo_path_rename - Target for security_path_rename().
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*
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* @old_parent: Pointer to "struct path".
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* @old_dentry: Pointer to "struct dentry".
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* @new_parent: Pointer to "struct path".
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* @new_dentry: Pointer to "struct dentry".
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*
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* Returns 0 on success, negative value otherwise.
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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_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
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}
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/**
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* tomoyo_file_fcntl - Target for security_file_fcntl().
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*
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* @file: Pointer to "struct file".
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* @cmd: Command for fcntl().
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* @arg: Argument for @cmd.
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*
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* Returns 0 on success, negative value otherwise.
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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 0;
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return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
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O_WRONLY | (arg & O_APPEND));
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}
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/**
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* tomoyo_dentry_open - Target for security_dentry_open().
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*
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* @f: Pointer to "struct file".
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* @cred: Pointer to "struct cred".
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*
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* Returns 0 on success, negative value otherwise.
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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_file_ioctl - Target for security_file_ioctl().
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*
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* @file: Pointer to "struct file".
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* @cmd: Command for ioctl().
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* @arg: Argument for @cmd.
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*
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* Returns 0 on success, negative value otherwise.
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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_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
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}
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/**
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* tomoyo_path_chmod - Target for security_path_chmod().
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*
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* @path: Pointer to "struct path".
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* @mode: DAC permission mode.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_path_chmod(struct path *path, umode_t mode)
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{
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return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
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mode & S_IALLUGO);
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}
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/**
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* tomoyo_path_chown - Target for security_path_chown().
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*
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* @path: Pointer to "struct path".
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* @uid: Owner ID.
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* @gid: Group ID.
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*
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* Returns 0 on success, negative value otherwise.
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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_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
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if (!error && gid != (gid_t) -1)
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error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
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return error;
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}
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/**
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* tomoyo_path_chroot - Target for security_path_chroot().
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*
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* @path: Pointer to "struct path".
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*
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* Returns 0 on success, negative value otherwise.
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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_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
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}
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/**
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* tomoyo_sb_mount - Target for security_sb_mount().
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*
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* @dev_name: Name of device file. Maybe NULL.
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* @path: Pointer to "struct path".
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* @type: Name of filesystem type. Maybe NULL.
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* @flags: Mount options.
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* @data: Optional data. Maybe NULL.
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*
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* Returns 0 on success, negative value otherwise.
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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_mount_permission(dev_name, path, type, flags, data);
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}
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/**
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* tomoyo_sb_umount - Target for security_sb_umount().
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*
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* @mnt: Pointer to "struct vfsmount".
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* @flags: Unmount options.
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*
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* Returns 0 on success, negative value otherwise.
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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_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
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}
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/**
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* tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
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*
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* @old_path: Pointer to "struct path".
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* @new_path: Pointer to "struct path".
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*
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* Returns 0 on success, negative value otherwise.
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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_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
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}
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/**
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* tomoyo_socket_listen - Check permission for listen().
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*
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* @sock: Pointer to "struct socket".
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* @backlog: Backlog parameter.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_socket_listen(struct socket *sock, int backlog)
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{
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return tomoyo_socket_listen_permission(sock);
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}
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/**
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* tomoyo_socket_connect - Check permission for connect().
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*
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* @sock: Pointer to "struct socket".
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* @addr: Pointer to "struct sockaddr".
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* @addr_len: Size of @addr.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr,
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int addr_len)
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{
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return tomoyo_socket_connect_permission(sock, addr, addr_len);
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}
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/**
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* tomoyo_socket_bind - Check permission for bind().
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*
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* @sock: Pointer to "struct socket".
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* @addr: Pointer to "struct sockaddr".
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* @addr_len: Size of @addr.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr,
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int addr_len)
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{
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return tomoyo_socket_bind_permission(sock, addr, addr_len);
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}
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/**
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* tomoyo_socket_sendmsg - Check permission for sendmsg().
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*
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* @sock: Pointer to "struct socket".
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* @msg: Pointer to "struct msghdr".
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* @size: Size of message.
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
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int size)
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{
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return tomoyo_socket_sendmsg_permission(sock, msg, size);
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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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.cred_free = tomoyo_cred_free,
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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,
|
|
.path_rename = tomoyo_path_rename,
|
|
.inode_getattr = tomoyo_inode_getattr,
|
|
.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,
|
|
.socket_bind = tomoyo_socket_bind,
|
|
.socket_connect = tomoyo_socket_connect,
|
|
.socket_listen = tomoyo_socket_listen,
|
|
.socket_sendmsg = tomoyo_socket_sendmsg,
|
|
};
|
|
|
|
/* Lock for GC. */
|
|
struct srcu_struct tomoyo_ss;
|
|
|
|
/**
|
|
* tomoyo_init - Register TOMOYO Linux as a LSM module.
|
|
*
|
|
* Returns 0.
|
|
*/
|
|
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_mm_init();
|
|
return 0;
|
|
}
|
|
|
|
security_initcall(tomoyo_init);
|