/*
* Stub functions for the default security function pointers in case no
* security model is loaded.
*
* Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#undef DEBUG
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/security.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <net/sock.h>
static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
{
return 0;
}
static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
kernel_cap_t * inheritable, kernel_cap_t * permitted)
{
*effective = *inheritable = *permitted = 0;
if (!issecure(SECURE_NOROOT)) {
if (target->euid == 0) {
*permitted |= (~0 & ~CAP_FS_MASK);
*effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
}
if (target->fsuid == 0) {
*permitted |= CAP_FS_MASK;
*effective |= CAP_FS_MASK;
}
}
return 0;
}
static int dummy_capset_check (struct task_struct *target,
kernel_cap_t * effective,
kernel_cap_t * inheritable,
kernel_cap_t * permitted)
{
return -EPERM;
}
static void dummy_capset_set (struct task_struct *target,
kernel_cap_t * effective,
kernel_cap_t * inheritable,
kernel_cap_t * permitted)
{
return;
}
static int dummy_acct (struct file *file)
{
return 0;
}
static int dummy_capable (struct task_struct *tsk, int cap)
{
if (cap_is_fs_cap (cap) ? tsk->fsuid == 0 : tsk->euid == 0)
/* capability granted */
return 0;
/* capability denied */
return -EPERM;
}
static int dummy_sysctl (ctl_table * table, int op)
{
return 0;
}
static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
{
return 0;
}
static int dummy_quota_on (struct file *f)
{
return 0;
}
static int dummy_syslog (int type)
{
if ((type != 3) && current->euid)
return -EPERM;
return 0;
}
static int dummy_vm_enough_memory(long pages)
{
unsigned long free, allowed;
vm_acct_memory(pages);
/*
* Sometimes we want to use more memory than we have
*/
if (sysctl_overcommit_memory == 1)
return 0;
if (sysctl_overcommit_memory == 0) {
free = get_page_cache_size();
free += nr_free_pages();
free += nr_swap_pages;
/*
* Any slabs which are created with the
* SLAB_RECLAIM_ACCOUNT flag claim to have contents
* which are reclaimable, under pressure. The dentry
* cache and most inode caches should fall into this
*/
free += atomic_read(&slab_reclaim_pages);
/*
* Leave the last 3% for root
*/
if (current->euid)
free -= free / 32;
if (free > pages)
return 0;
vm_unacct_memory(pages);
return -ENOMEM;
}
allowed = totalram_pages * sysctl_overcommit_ratio / 100;
allowed += total_swap_pages;
if (atomic_read(&vm_committed_space) < allowed)
return 0;
vm_unacct_memory(pages);
return -ENOMEM;
}
static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
{
return 0;
}
static void dummy_bprm_free_security (struct linux_binprm *bprm)
{
return;
}
static void dummy_bprm_compute_creds (struct linux_binprm *bprm)
{
return;
}
static int dummy_bprm_set_security (struct linux_binprm *bprm)
{
return 0;
}
static int dummy_bprm_check_security (struct linux_binprm *bprm)
{
return 0;
}
static int dummy_bprm_secureexec (struct linux_binprm *bprm)
{
/* The new userland will simply use the value provided
in the AT_SECURE field to decide whether secure mode
is required. Hence, this logic is required to preserve
the legacy decision algorithm used by the old userland. */
return (current->euid != current->uid ||
current->egid != current->gid);
}
static int dummy_sb_alloc_security (struct super_block *sb)
{
return 0;
}
static void dummy_sb_free_security (struct super_block *sb)
{
return;
}
static int dummy_sb_kern_mount (struct super_block *sb)
{
return 0;
}
static int dummy_sb_statfs (struct super_block *sb)
{
return 0;
}
static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
unsigned long flags, void *data)
{
return 0;
}
static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
{
return 0;
}
static int dummy_sb_umount (struct vfsmount *mnt, int flags)
{
return 0;
}
static void dummy_sb_umount_close (struct vfsmount *mnt)
{
return;
}
static void dummy_sb_umount_busy (struct vfsmount *mnt)
{
return;
}
static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
void *data)
{
return;
}
static void dummy_sb_post_mountroot (void)
{
return;
}
static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
{
return;
}
static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
{
return 0;
}
static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
{
return;
}
static int dummy_inode_alloc_security (struct inode *inode)
{
return 0;
}
static void dummy_inode_free_security (struct inode *inode)
{
return;
}
static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
int mask)
{
return 0;
}
static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
int mask)
{
return;
}
static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
struct dentry *new_dentry)
{
return 0;
}
static void dummy_inode_post_link (struct dentry *old_dentry,
struct inode *inode,
struct dentry *new_dentry)
{
return;
}
static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
{
return 0;
}
static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
const char *name)
{
return 0;
}
static void dummy_inode_post_symlink (struct inode *inode,
struct dentry *dentry, const char *name)
{
return;
}
static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
int mask)
{
return 0;
}
static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
int mask)
{
return;
}
static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
{
return 0;
}
static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
int mode, dev_t dev)
{
return 0;
}
static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
int mode, dev_t dev)
{
return;
}
static int dummy_inode_rename (struct inode *old_inode,
struct dentry *old_dentry,
struct inode *new_inode,
struct dentry *new_dentry)
{
return 0;
}
static void dummy_inode_post_rename (struct inode *old_inode,
struct dentry *old_dentry,
struct inode *new_inode,
struct dentry *new_dentry)
{
return;
}
static int dummy_inode_readlink (struct dentry *dentry)
{
return 0;
}
static int dummy_inode_follow_link (struct dentry *dentry,
struct nameidata *nameidata)
{
return 0;
}
static int dummy_inode_permission (struct inode *inode, int mask)
{
return 0;
}
static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
{
return 0;
}
static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
{
return 0;
}
static void dummy_inode_delete (struct inode *ino)
{
return;
}
static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
size_t size, int flags)
{
return 0;
}
static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
size_t size, int flags)
{
}
static int dummy_inode_getxattr (struct dentry *dentry, char *name)
{
return 0;
}
static int dummy_inode_listxattr (struct dentry *dentry)
{
return 0;
}
static int dummy_inode_removexattr (struct dentry *dentry, char *name)
{
return 0;
}
static int dummy_inode_getsecurity(struct dentry *dentry, const char *name, void *buffer, size_t size)
{
return -EOPNOTSUPP;
}
static int dummy_inode_setsecurity(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
{
return -EOPNOTSUPP;
}
static int dummy_inode_listsecurity(struct dentry *dentry, char *buffer)
{
return 0;
}
static int dummy_file_permission (struct file *file, int mask)
{
return 0;
}
static int dummy_file_alloc_security (struct file *file)
{
return 0;
}
static void dummy_file_free_security (struct file *file)
{
return;
}
static int dummy_file_ioctl (struct file *file, unsigned int command,
unsigned long arg)
{
return 0;
}
static int dummy_file_mmap (struct file *file, unsigned long prot,
unsigned long flags)
{
return 0;
}
static int dummy_file_mprotect (struct vm_area_struct *vma, unsigned long prot)
{
return 0;
}
static int dummy_file_lock (struct file *file, unsigned int cmd)
{
return 0;
}
static int dummy_file_fcntl (struct file *file, unsigned int cmd,
unsigned long arg)
{
return 0;
}
static int dummy_file_set_fowner (struct file *file)
{
return 0;
}
static int dummy_file_send_sigiotask (struct task_struct *tsk,
struct fown_struct *fown, int fd,
int reason)
{
return 0;
}
static int dummy_file_receive (struct file *file)
{
return 0;
}
static int dummy_task_create (unsigned long clone_flags)
{
return 0;
}
static int dummy_task_alloc_security (struct task_struct *p)
{
return 0;
}
static void dummy_task_free_security (struct task_struct *p)
{
return;
}
static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
{
return 0;
}
static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
{
return 0;
}
static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
{
return 0;
}
static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
{
return 0;
}
static int dummy_task_getpgid (struct task_struct *p)
{
return 0;
}
static int dummy_task_getsid (struct task_struct *p)
{
return 0;
}
static int dummy_task_setgroups (int gidsetsize, gid_t * grouplist)
{
return 0;
}
static int dummy_task_setnice (struct task_struct *p, int nice)
{
return 0;
}
static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
{
return 0;
}
static int dummy_task_setscheduler (struct task_struct *p, int policy,
struct sched_param *lp)
{
return 0;
}
static int dummy_task_getscheduler (struct task_struct *p)
{
return 0;
}
static int dummy_task_wait (struct task_struct *p)
{
return 0;
}
static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
int sig)
{
return 0;
}
static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
return 0;
}
static void dummy_task_reparent_to_init (struct task_struct *p)
{
p->euid = p->fsuid = 0;
return;
}
static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
{ }
static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
{
return 0;
}
static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
{
return 0;
}
static void dummy_msg_msg_free_security (struct msg_msg *msg)
{
return;
}
static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
{
return 0;
}
static void dummy_msg_queue_free_security (struct msg_queue *msq)
{
return;
}
static int dummy_msg_queue_associate (struct msg_queue *msq,
int msqflg)
{
return 0;
}
static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
{
return 0;
}
static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
int msgflg)
{
return 0;
}
static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
struct task_struct *target, long type,
int mode)
{
return 0;
}
static int dummy_shm_alloc_security (struct shmid_kernel *shp)
{
return 0;
}
static void dummy_shm_free_security (struct shmid_kernel *shp)
{
return;
}
static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
{
return 0;
}
static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
{
return 0;
}
static int dummy_shm_shmat (struct shmid_kernel *shp, char *shmaddr,
int shmflg)
{
return 0;
}
static int dummy_sem_alloc_security (struct sem_array *sma)
{
return 0;
}
static void dummy_sem_free_security (struct sem_array *sma)
{
return;
}
static int dummy_sem_associate (struct sem_array *sma, int semflg)
{
return 0;
}
static int dummy_sem_semctl (struct sem_array *sma, int cmd)
{
return 0;
}
static int dummy_sem_semop (struct sem_array *sma,
struct sembuf *sops, unsigned nsops, int alter)
{
return 0;
}
static int dummy_netlink_send (struct sk_buff *skb)
{
if (current->euid == 0)
cap_raise (NETLINK_CB (skb).eff_cap, CAP_NET_ADMIN);
else
NETLINK_CB (skb).eff_cap = 0;
return 0;
}
static int dummy_netlink_recv (struct sk_buff *skb)
{
if (!cap_raised (NETLINK_CB (skb).eff_cap, CAP_NET_ADMIN))
return -EPERM;
return 0;
}
#ifdef CONFIG_SECURITY_NETWORK
static int dummy_unix_stream_connect (struct socket *sock,
struct socket *other,
struct sock *newsk)
{
return 0;
}
static int dummy_unix_may_send (struct socket *sock,
struct socket *other)
{
return 0;
}
static int dummy_socket_create (int family, int type, int protocol)
{
return 0;
}
static void dummy_socket_post_create (struct socket *sock, int family, int type,
int protocol)
{
return;
}
static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
int addrlen)
{
return 0;
}
static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
int addrlen)
{
return 0;
}
static int dummy_socket_listen (struct socket *sock, int backlog)
{
return 0;
}
static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
{
return 0;
}
static void dummy_socket_post_accept (struct socket *sock,
struct socket *newsock)
{
return;
}
static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
int size)
{
return 0;
}
static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
int size, int flags)
{
return 0;
}
static int dummy_socket_getsockname (struct socket *sock)
{
return 0;
}
static int dummy_socket_getpeername (struct socket *sock)
{
return 0;
}
static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
{
return 0;
}
static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
{
return 0;
}
static int dummy_socket_shutdown (struct socket *sock, int how)
{
return 0;
}
static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
{
return 0;
}
#endif /* CONFIG_SECURITY_NETWORK */
static int dummy_register_security (const char *name, struct security_operations *ops)
{
return -EINVAL;
}
static int dummy_unregister_security (const char *name, struct security_operations *ops)
{
return -EINVAL;
}
static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
{
return;
}
static int dummy_getprocattr(struct task_struct *p, char *name, void *value, size_t size)
{
return -EINVAL;
}
static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
{
return -EINVAL;
}
struct security_operations dummy_security_ops;
#define set_to_dummy_if_null(ops, function) \
do { \
if (!ops->function) { \
ops->function = dummy_##function; \
pr_debug("Had to override the " #function \
" security operation with the dummy one.\n");\
} \
} while (0)
void security_fixup_ops (struct security_operations *ops)
{
set_to_dummy_if_null(ops, ptrace);
set_to_dummy_if_null(ops, capget);
set_to_dummy_if_null(ops, capset_check);
set_to_dummy_if_null(ops, capset_set);
set_to_dummy_if_null(ops, acct);
set_to_dummy_if_null(ops, capable);
set_to_dummy_if_null(ops, quotactl);
set_to_dummy_if_null(ops, quota_on);
set_to_dummy_if_null(ops, sysctl);
set_to_dummy_if_null(ops, syslog);
set_to_dummy_if_null(ops, vm_enough_memory);
set_to_dummy_if_null(ops, bprm_alloc_security);
set_to_dummy_if_null(ops, bprm_free_security);
set_to_dummy_if_null(ops, bprm_compute_creds);
set_to_dummy_if_null(ops, bprm_set_security);
set_to_dummy_if_null(ops, bprm_check_security);
set_to_dummy_if_null(ops, bprm_secureexec);
set_to_dummy_if_null(ops, sb_alloc_security);
set_to_dummy_if_null(ops, sb_free_security);
set_to_dummy_if_null(ops, sb_kern_mount);
set_to_dummy_if_null(ops, sb_statfs);
set_to_dummy_if_null(ops, sb_mount);
set_to_dummy_if_null(ops, sb_check_sb);
set_to_dummy_if_null(ops, sb_umount);
set_to_dummy_if_null(ops, sb_umount_close);
set_to_dummy_if_null(ops, sb_umount_busy);
set_to_dummy_if_null(ops, sb_post_remount);
set_to_dummy_if_null(ops, sb_post_mountroot);
set_to_dummy_if_null(ops, sb_post_addmount);
set_to_dummy_if_null(ops, sb_pivotroot);
set_to_dummy_if_null(ops, sb_post_pivotroot);
set_to_dummy_if_null(ops, inode_alloc_security);
set_to_dummy_if_null(ops, inode_free_security);
set_to_dummy_if_null(ops, inode_create);
set_to_dummy_if_null(ops, inode_post_create);
set_to_dummy_if_null(ops, inode_link);
set_to_dummy_if_null(ops, inode_post_link);
set_to_dummy_if_null(ops, inode_unlink);
set_to_dummy_if_null(ops, inode_symlink);
set_to_dummy_if_null(ops, inode_post_symlink);
set_to_dummy_if_null(ops, inode_mkdir);
set_to_dummy_if_null(ops, inode_post_mkdir);
set_to_dummy_if_null(ops, inode_rmdir);
set_to_dummy_if_null(ops, inode_mknod);
set_to_dummy_if_null(ops, inode_post_mknod);
set_to_dummy_if_null(ops, inode_rename);
set_to_dummy_if_null(ops, inode_post_rename);
set_to_dummy_if_null(ops, inode_readlink);
set_to_dummy_if_null(ops, inode_follow_link);
set_to_dummy_if_null(ops, inode_permission);
set_to_dummy_if_null(ops, inode_setattr);
set_to_dummy_if_null(ops, inode_getattr);
set_to_dummy_if_null(ops, inode_delete);
set_to_dummy_if_null(ops, inode_setxattr);
set_to_dummy_if_null(ops, inode_post_setxattr);
set_to_dummy_if_null(ops, inode_getxattr);
set_to_dummy_if_null(ops, inode_listxattr);
set_to_dummy_if_null(ops, inode_removexattr);
set_to_dummy_if_null(ops, inode_getsecurity);
set_to_dummy_if_null(ops, inode_setsecurity);
set_to_dummy_if_null(ops, inode_listsecurity);
set_to_dummy_if_null(ops, file_permission);
set_to_dummy_if_null(ops, file_alloc_security);
set_to_dummy_if_null(ops, file_free_security);
set_to_dummy_if_null(ops, file_ioctl);
set_to_dummy_if_null(ops, file_mmap);
set_to_dummy_if_null(ops, file_mprotect);
set_to_dummy_if_null(ops, file_lock);
set_to_dummy_if_null(ops, file_fcntl);
set_to_dummy_if_null(ops, file_set_fowner);
set_to_dummy_if_null(ops, file_send_sigiotask);
set_to_dummy_if_null(ops, file_receive);
set_to_dummy_if_null(ops, task_create);
set_to_dummy_if_null(ops, task_alloc_security);
set_to_dummy_if_null(ops, task_free_security);
set_to_dummy_if_null(ops, task_setuid);
set_to_dummy_if_null(ops, task_post_setuid);
set_to_dummy_if_null(ops, task_setgid);
set_to_dummy_if_null(ops, task_setpgid);
set_to_dummy_if_null(ops, task_getpgid);
set_to_dummy_if_null(ops, task_getsid);
set_to_dummy_if_null(ops, task_setgroups);
set_to_dummy_if_null(ops, task_setnice);
set_to_dummy_if_null(ops, task_setrlimit);
set_to_dummy_if_null(ops, task_setscheduler);
set_to_dummy_if_null(ops, task_getscheduler);
set_to_dummy_if_null(ops, task_wait);
set_to_dummy_if_null(ops, task_kill);
set_to_dummy_if_null(ops, task_prctl);
set_to_dummy_if_null(ops, task_reparent_to_init);
set_to_dummy_if_null(ops, task_to_inode);
set_to_dummy_if_null(ops, ipc_permission);
set_to_dummy_if_null(ops, msg_msg_alloc_security);
set_to_dummy_if_null(ops, msg_msg_free_security);
set_to_dummy_if_null(ops, msg_queue_alloc_security);
set_to_dummy_if_null(ops, msg_queue_free_security);
set_to_dummy_if_null(ops, msg_queue_associate);
set_to_dummy_if_null(ops, msg_queue_msgctl);
set_to_dummy_if_null(ops, msg_queue_msgsnd);
set_to_dummy_if_null(ops, msg_queue_msgrcv);
set_to_dummy_if_null(ops, shm_alloc_security);
set_to_dummy_if_null(ops, shm_free_security);
set_to_dummy_if_null(ops, shm_associate);
set_to_dummy_if_null(ops, shm_shmctl);
set_to_dummy_if_null(ops, shm_shmat);
set_to_dummy_if_null(ops, sem_alloc_security);
set_to_dummy_if_null(ops, sem_free_security);
set_to_dummy_if_null(ops, sem_associate);
set_to_dummy_if_null(ops, sem_semctl);
set_to_dummy_if_null(ops, sem_semop);
set_to_dummy_if_null(ops, netlink_send);
set_to_dummy_if_null(ops, netlink_recv);
set_to_dummy_if_null(ops, register_security);
set_to_dummy_if_null(ops, unregister_security);
set_to_dummy_if_null(ops, d_instantiate);
set_to_dummy_if_null(ops, getprocattr);
set_to_dummy_if_null(ops, setprocattr);
#ifdef CONFIG_SECURITY_NETWORK
set_to_dummy_if_null(ops, unix_stream_connect);
set_to_dummy_if_null(ops, unix_may_send);
set_to_dummy_if_null(ops, socket_create);
set_to_dummy_if_null(ops, socket_post_create);
set_to_dummy_if_null(ops, socket_bind);
set_to_dummy_if_null(ops, socket_connect);
set_to_dummy_if_null(ops, socket_listen);
set_to_dummy_if_null(ops, socket_accept);
set_to_dummy_if_null(ops, socket_post_accept);
set_to_dummy_if_null(ops, socket_sendmsg);
set_to_dummy_if_null(ops, socket_recvmsg);
set_to_dummy_if_null(ops, socket_getsockname);
set_to_dummy_if_null(ops, socket_getpeername);
set_to_dummy_if_null(ops, socket_setsockopt);
set_to_dummy_if_null(ops, socket_getsockopt);
set_to_dummy_if_null(ops, socket_shutdown);
set_to_dummy_if_null(ops, socket_sock_rcv_skb);
#endif /* CONFIG_SECURITY_NETWORK */
}