2 * Stub functions for the default security function pointers in case no
3 * security model is loaded.
5 * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
6 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
7 * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
17 #include <linux/config.h>
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/mman.h>
21 #include <linux/pagemap.h>
22 #include <linux/swap.h>
23 #include <linux/security.h>
24 #include <linux/skbuff.h>
25 #include <linux/netlink.h>
27 #include <linux/xattr.h>
28 #include <linux/hugetlb.h>
29 #include <linux/ptrace.h>
30 #include <linux/file.h>
32 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
37 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
38 kernel_cap_t * inheritable, kernel_cap_t * permitted)
40 *effective = *inheritable = *permitted = 0;
41 if (!issecure(SECURE_NOROOT)) {
42 if (target->euid == 0) {
43 *permitted |= (~0 & ~CAP_FS_MASK);
44 *effective |= (~0 & ~CAP_TO_MASK(CAP_SETPCAP) & ~CAP_FS_MASK);
46 if (target->fsuid == 0) {
47 *permitted |= CAP_FS_MASK;
48 *effective |= CAP_FS_MASK;
54 static int dummy_capset_check (struct task_struct *target,
55 kernel_cap_t * effective,
56 kernel_cap_t * inheritable,
57 kernel_cap_t * permitted)
62 static void dummy_capset_set (struct task_struct *target,
63 kernel_cap_t * effective,
64 kernel_cap_t * inheritable,
65 kernel_cap_t * permitted)
70 static int dummy_acct (struct file *file)
75 static int dummy_capable (struct task_struct *tsk, int cap)
77 if (cap_raised (tsk->cap_effective, cap))
82 static int dummy_sysctl (ctl_table * table, int op)
87 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
92 static int dummy_quota_on (struct dentry *dentry)
97 static int dummy_syslog (int type)
99 if ((type != 3 && type != 10) && current->euid)
104 static int dummy_settime(struct timespec *ts, struct timezone *tz)
106 if (!capable(CAP_SYS_TIME))
111 static int dummy_vm_enough_memory(long pages)
113 int cap_sys_admin = 0;
115 if (dummy_capable(current, CAP_SYS_ADMIN) == 0)
117 return __vm_enough_memory(pages, cap_sys_admin);
120 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
125 static void dummy_bprm_free_security (struct linux_binprm *bprm)
130 static void dummy_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
132 if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) {
133 current->mm->dumpable = suid_dumpable;
135 if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) {
136 bprm->e_uid = current->uid;
137 bprm->e_gid = current->gid;
141 current->suid = current->euid = current->fsuid = bprm->e_uid;
142 current->sgid = current->egid = current->fsgid = bprm->e_gid;
144 dummy_capget(current, ¤t->cap_effective, ¤t->cap_inheritable, ¤t->cap_permitted);
147 static void dummy_bprm_post_apply_creds (struct linux_binprm *bprm)
152 static int dummy_bprm_set_security (struct linux_binprm *bprm)
157 static int dummy_bprm_check_security (struct linux_binprm *bprm)
162 static int dummy_bprm_secureexec (struct linux_binprm *bprm)
164 /* The new userland will simply use the value provided
165 in the AT_SECURE field to decide whether secure mode
166 is required. Hence, this logic is required to preserve
167 the legacy decision algorithm used by the old userland. */
168 return (current->euid != current->uid ||
169 current->egid != current->gid);
172 static int dummy_sb_alloc_security (struct super_block *sb)
177 static void dummy_sb_free_security (struct super_block *sb)
182 static int dummy_sb_copy_data (struct file_system_type *type,
183 void *orig, void *copy)
188 static int dummy_sb_kern_mount (struct super_block *sb, void *data)
193 static int dummy_sb_statfs (struct super_block *sb)
198 static int dummy_sb_mount (char *dev_name, struct nameidata *nd, char *type,
199 unsigned long flags, void *data)
204 static int dummy_sb_check_sb (struct vfsmount *mnt, struct nameidata *nd)
209 static int dummy_sb_umount (struct vfsmount *mnt, int flags)
214 static void dummy_sb_umount_close (struct vfsmount *mnt)
219 static void dummy_sb_umount_busy (struct vfsmount *mnt)
224 static void dummy_sb_post_remount (struct vfsmount *mnt, unsigned long flags,
231 static void dummy_sb_post_mountroot (void)
236 static void dummy_sb_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
241 static int dummy_sb_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
246 static void dummy_sb_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
251 static int dummy_inode_alloc_security (struct inode *inode)
256 static void dummy_inode_free_security (struct inode *inode)
261 static int dummy_inode_init_security (struct inode *inode, struct inode *dir,
262 char **name, void **value, size_t *len)
267 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
273 static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
279 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
280 struct dentry *new_dentry)
285 static void dummy_inode_post_link (struct dentry *old_dentry,
287 struct dentry *new_dentry)
292 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
297 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
303 static void dummy_inode_post_symlink (struct inode *inode,
304 struct dentry *dentry, const char *name)
309 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
315 static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
321 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
326 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
332 static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
338 static int dummy_inode_rename (struct inode *old_inode,
339 struct dentry *old_dentry,
340 struct inode *new_inode,
341 struct dentry *new_dentry)
346 static void dummy_inode_post_rename (struct inode *old_inode,
347 struct dentry *old_dentry,
348 struct inode *new_inode,
349 struct dentry *new_dentry)
354 static int dummy_inode_readlink (struct dentry *dentry)
359 static int dummy_inode_follow_link (struct dentry *dentry,
360 struct nameidata *nameidata)
365 static int dummy_inode_permission (struct inode *inode, int mask, struct nameidata *nd)
370 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
375 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
380 static void dummy_inode_delete (struct inode *ino)
385 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
386 size_t size, int flags)
388 if (!strncmp(name, XATTR_SECURITY_PREFIX,
389 sizeof(XATTR_SECURITY_PREFIX) - 1) &&
390 !capable(CAP_SYS_ADMIN))
395 static void dummy_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
396 size_t size, int flags)
400 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
405 static int dummy_inode_listxattr (struct dentry *dentry)
410 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
412 if (!strncmp(name, XATTR_SECURITY_PREFIX,
413 sizeof(XATTR_SECURITY_PREFIX) - 1) &&
414 !capable(CAP_SYS_ADMIN))
419 static int dummy_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size)
424 static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
429 static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
434 static int dummy_file_permission (struct file *file, int mask)
439 static int dummy_file_alloc_security (struct file *file)
444 static void dummy_file_free_security (struct file *file)
449 static int dummy_file_ioctl (struct file *file, unsigned int command,
455 static int dummy_file_mmap (struct file *file, unsigned long reqprot,
462 static int dummy_file_mprotect (struct vm_area_struct *vma,
463 unsigned long reqprot,
469 static int dummy_file_lock (struct file *file, unsigned int cmd)
474 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
480 static int dummy_file_set_fowner (struct file *file)
485 static int dummy_file_send_sigiotask (struct task_struct *tsk,
486 struct fown_struct *fown, int sig)
491 static int dummy_file_receive (struct file *file)
496 static int dummy_task_create (unsigned long clone_flags)
501 static int dummy_task_alloc_security (struct task_struct *p)
506 static void dummy_task_free_security (struct task_struct *p)
511 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
516 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
518 dummy_capget(current, ¤t->cap_effective, ¤t->cap_inheritable, ¤t->cap_permitted);
522 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
527 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
532 static int dummy_task_getpgid (struct task_struct *p)
537 static int dummy_task_getsid (struct task_struct *p)
542 static int dummy_task_setgroups (struct group_info *group_info)
547 static int dummy_task_setnice (struct task_struct *p, int nice)
552 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
557 static int dummy_task_setscheduler (struct task_struct *p, int policy,
558 struct sched_param *lp)
563 static int dummy_task_getscheduler (struct task_struct *p)
568 static int dummy_task_wait (struct task_struct *p)
573 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
579 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
580 unsigned long arg4, unsigned long arg5)
585 static void dummy_task_reparent_to_init (struct task_struct *p)
587 p->euid = p->fsuid = 0;
591 static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
594 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
599 static int dummy_msg_msg_alloc_security (struct msg_msg *msg)
604 static void dummy_msg_msg_free_security (struct msg_msg *msg)
609 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
614 static void dummy_msg_queue_free_security (struct msg_queue *msq)
619 static int dummy_msg_queue_associate (struct msg_queue *msq,
625 static int dummy_msg_queue_msgctl (struct msg_queue *msq, int cmd)
630 static int dummy_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
636 static int dummy_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
637 struct task_struct *target, long type,
643 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
648 static void dummy_shm_free_security (struct shmid_kernel *shp)
653 static int dummy_shm_associate (struct shmid_kernel *shp, int shmflg)
658 static int dummy_shm_shmctl (struct shmid_kernel *shp, int cmd)
663 static int dummy_shm_shmat (struct shmid_kernel *shp, char __user *shmaddr,
669 static int dummy_sem_alloc_security (struct sem_array *sma)
674 static void dummy_sem_free_security (struct sem_array *sma)
679 static int dummy_sem_associate (struct sem_array *sma, int semflg)
684 static int dummy_sem_semctl (struct sem_array *sma, int cmd)
689 static int dummy_sem_semop (struct sem_array *sma,
690 struct sembuf *sops, unsigned nsops, int alter)
695 static int dummy_netlink_send (struct sock *sk, struct sk_buff *skb)
697 NETLINK_CB(skb).eff_cap = current->cap_effective;
701 static int dummy_netlink_recv (struct sk_buff *skb)
703 if (!cap_raised (NETLINK_CB (skb).eff_cap, CAP_NET_ADMIN))
708 #ifdef CONFIG_SECURITY_NETWORK
709 static int dummy_unix_stream_connect (struct socket *sock,
710 struct socket *other,
716 static int dummy_unix_may_send (struct socket *sock,
717 struct socket *other)
722 static int dummy_socket_create (int family, int type,
723 int protocol, int kern)
728 static void dummy_socket_post_create (struct socket *sock, int family, int type,
729 int protocol, int kern)
734 static int dummy_socket_bind (struct socket *sock, struct sockaddr *address,
740 static int dummy_socket_connect (struct socket *sock, struct sockaddr *address,
746 static int dummy_socket_listen (struct socket *sock, int backlog)
751 static int dummy_socket_accept (struct socket *sock, struct socket *newsock)
756 static void dummy_socket_post_accept (struct socket *sock,
757 struct socket *newsock)
762 static int dummy_socket_sendmsg (struct socket *sock, struct msghdr *msg,
768 static int dummy_socket_recvmsg (struct socket *sock, struct msghdr *msg,
774 static int dummy_socket_getsockname (struct socket *sock)
779 static int dummy_socket_getpeername (struct socket *sock)
784 static int dummy_socket_setsockopt (struct socket *sock, int level, int optname)
789 static int dummy_socket_getsockopt (struct socket *sock, int level, int optname)
794 static int dummy_socket_shutdown (struct socket *sock, int how)
799 static int dummy_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
804 static int dummy_socket_getpeersec(struct socket *sock, char __user *optval,
805 int __user *optlen, unsigned len)
810 static inline int dummy_sk_alloc_security (struct sock *sk, int family, int priority)
815 static inline void dummy_sk_free_security (struct sock *sk)
818 #endif /* CONFIG_SECURITY_NETWORK */
820 static int dummy_register_security (const char *name, struct security_operations *ops)
825 static int dummy_unregister_security (const char *name, struct security_operations *ops)
830 static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode)
835 static int dummy_getprocattr(struct task_struct *p, char *name, void *value, size_t size)
840 static int dummy_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
846 struct security_operations dummy_security_ops;
848 #define set_to_dummy_if_null(ops, function) \
850 if (!ops->function) { \
851 ops->function = dummy_##function; \
852 pr_debug("Had to override the " #function \
853 " security operation with the dummy one.\n");\
857 void security_fixup_ops (struct security_operations *ops)
859 set_to_dummy_if_null(ops, ptrace);
860 set_to_dummy_if_null(ops, capget);
861 set_to_dummy_if_null(ops, capset_check);
862 set_to_dummy_if_null(ops, capset_set);
863 set_to_dummy_if_null(ops, acct);
864 set_to_dummy_if_null(ops, capable);
865 set_to_dummy_if_null(ops, quotactl);
866 set_to_dummy_if_null(ops, quota_on);
867 set_to_dummy_if_null(ops, sysctl);
868 set_to_dummy_if_null(ops, syslog);
869 set_to_dummy_if_null(ops, settime);
870 set_to_dummy_if_null(ops, vm_enough_memory);
871 set_to_dummy_if_null(ops, bprm_alloc_security);
872 set_to_dummy_if_null(ops, bprm_free_security);
873 set_to_dummy_if_null(ops, bprm_apply_creds);
874 set_to_dummy_if_null(ops, bprm_post_apply_creds);
875 set_to_dummy_if_null(ops, bprm_set_security);
876 set_to_dummy_if_null(ops, bprm_check_security);
877 set_to_dummy_if_null(ops, bprm_secureexec);
878 set_to_dummy_if_null(ops, sb_alloc_security);
879 set_to_dummy_if_null(ops, sb_free_security);
880 set_to_dummy_if_null(ops, sb_copy_data);
881 set_to_dummy_if_null(ops, sb_kern_mount);
882 set_to_dummy_if_null(ops, sb_statfs);
883 set_to_dummy_if_null(ops, sb_mount);
884 set_to_dummy_if_null(ops, sb_check_sb);
885 set_to_dummy_if_null(ops, sb_umount);
886 set_to_dummy_if_null(ops, sb_umount_close);
887 set_to_dummy_if_null(ops, sb_umount_busy);
888 set_to_dummy_if_null(ops, sb_post_remount);
889 set_to_dummy_if_null(ops, sb_post_mountroot);
890 set_to_dummy_if_null(ops, sb_post_addmount);
891 set_to_dummy_if_null(ops, sb_pivotroot);
892 set_to_dummy_if_null(ops, sb_post_pivotroot);
893 set_to_dummy_if_null(ops, inode_alloc_security);
894 set_to_dummy_if_null(ops, inode_free_security);
895 set_to_dummy_if_null(ops, inode_init_security);
896 set_to_dummy_if_null(ops, inode_create);
897 set_to_dummy_if_null(ops, inode_post_create);
898 set_to_dummy_if_null(ops, inode_link);
899 set_to_dummy_if_null(ops, inode_post_link);
900 set_to_dummy_if_null(ops, inode_unlink);
901 set_to_dummy_if_null(ops, inode_symlink);
902 set_to_dummy_if_null(ops, inode_post_symlink);
903 set_to_dummy_if_null(ops, inode_mkdir);
904 set_to_dummy_if_null(ops, inode_post_mkdir);
905 set_to_dummy_if_null(ops, inode_rmdir);
906 set_to_dummy_if_null(ops, inode_mknod);
907 set_to_dummy_if_null(ops, inode_post_mknod);
908 set_to_dummy_if_null(ops, inode_rename);
909 set_to_dummy_if_null(ops, inode_post_rename);
910 set_to_dummy_if_null(ops, inode_readlink);
911 set_to_dummy_if_null(ops, inode_follow_link);
912 set_to_dummy_if_null(ops, inode_permission);
913 set_to_dummy_if_null(ops, inode_setattr);
914 set_to_dummy_if_null(ops, inode_getattr);
915 set_to_dummy_if_null(ops, inode_delete);
916 set_to_dummy_if_null(ops, inode_setxattr);
917 set_to_dummy_if_null(ops, inode_post_setxattr);
918 set_to_dummy_if_null(ops, inode_getxattr);
919 set_to_dummy_if_null(ops, inode_listxattr);
920 set_to_dummy_if_null(ops, inode_removexattr);
921 set_to_dummy_if_null(ops, inode_getsecurity);
922 set_to_dummy_if_null(ops, inode_setsecurity);
923 set_to_dummy_if_null(ops, inode_listsecurity);
924 set_to_dummy_if_null(ops, file_permission);
925 set_to_dummy_if_null(ops, file_alloc_security);
926 set_to_dummy_if_null(ops, file_free_security);
927 set_to_dummy_if_null(ops, file_ioctl);
928 set_to_dummy_if_null(ops, file_mmap);
929 set_to_dummy_if_null(ops, file_mprotect);
930 set_to_dummy_if_null(ops, file_lock);
931 set_to_dummy_if_null(ops, file_fcntl);
932 set_to_dummy_if_null(ops, file_set_fowner);
933 set_to_dummy_if_null(ops, file_send_sigiotask);
934 set_to_dummy_if_null(ops, file_receive);
935 set_to_dummy_if_null(ops, task_create);
936 set_to_dummy_if_null(ops, task_alloc_security);
937 set_to_dummy_if_null(ops, task_free_security);
938 set_to_dummy_if_null(ops, task_setuid);
939 set_to_dummy_if_null(ops, task_post_setuid);
940 set_to_dummy_if_null(ops, task_setgid);
941 set_to_dummy_if_null(ops, task_setpgid);
942 set_to_dummy_if_null(ops, task_getpgid);
943 set_to_dummy_if_null(ops, task_getsid);
944 set_to_dummy_if_null(ops, task_setgroups);
945 set_to_dummy_if_null(ops, task_setnice);
946 set_to_dummy_if_null(ops, task_setrlimit);
947 set_to_dummy_if_null(ops, task_setscheduler);
948 set_to_dummy_if_null(ops, task_getscheduler);
949 set_to_dummy_if_null(ops, task_wait);
950 set_to_dummy_if_null(ops, task_kill);
951 set_to_dummy_if_null(ops, task_prctl);
952 set_to_dummy_if_null(ops, task_reparent_to_init);
953 set_to_dummy_if_null(ops, task_to_inode);
954 set_to_dummy_if_null(ops, ipc_permission);
955 set_to_dummy_if_null(ops, msg_msg_alloc_security);
956 set_to_dummy_if_null(ops, msg_msg_free_security);
957 set_to_dummy_if_null(ops, msg_queue_alloc_security);
958 set_to_dummy_if_null(ops, msg_queue_free_security);
959 set_to_dummy_if_null(ops, msg_queue_associate);
960 set_to_dummy_if_null(ops, msg_queue_msgctl);
961 set_to_dummy_if_null(ops, msg_queue_msgsnd);
962 set_to_dummy_if_null(ops, msg_queue_msgrcv);
963 set_to_dummy_if_null(ops, shm_alloc_security);
964 set_to_dummy_if_null(ops, shm_free_security);
965 set_to_dummy_if_null(ops, shm_associate);
966 set_to_dummy_if_null(ops, shm_shmctl);
967 set_to_dummy_if_null(ops, shm_shmat);
968 set_to_dummy_if_null(ops, sem_alloc_security);
969 set_to_dummy_if_null(ops, sem_free_security);
970 set_to_dummy_if_null(ops, sem_associate);
971 set_to_dummy_if_null(ops, sem_semctl);
972 set_to_dummy_if_null(ops, sem_semop);
973 set_to_dummy_if_null(ops, netlink_send);
974 set_to_dummy_if_null(ops, netlink_recv);
975 set_to_dummy_if_null(ops, register_security);
976 set_to_dummy_if_null(ops, unregister_security);
977 set_to_dummy_if_null(ops, d_instantiate);
978 set_to_dummy_if_null(ops, getprocattr);
979 set_to_dummy_if_null(ops, setprocattr);
980 #ifdef CONFIG_SECURITY_NETWORK
981 set_to_dummy_if_null(ops, unix_stream_connect);
982 set_to_dummy_if_null(ops, unix_may_send);
983 set_to_dummy_if_null(ops, socket_create);
984 set_to_dummy_if_null(ops, socket_post_create);
985 set_to_dummy_if_null(ops, socket_bind);
986 set_to_dummy_if_null(ops, socket_connect);
987 set_to_dummy_if_null(ops, socket_listen);
988 set_to_dummy_if_null(ops, socket_accept);
989 set_to_dummy_if_null(ops, socket_post_accept);
990 set_to_dummy_if_null(ops, socket_sendmsg);
991 set_to_dummy_if_null(ops, socket_recvmsg);
992 set_to_dummy_if_null(ops, socket_getsockname);
993 set_to_dummy_if_null(ops, socket_getpeername);
994 set_to_dummy_if_null(ops, socket_setsockopt);
995 set_to_dummy_if_null(ops, socket_getsockopt);
996 set_to_dummy_if_null(ops, socket_shutdown);
997 set_to_dummy_if_null(ops, socket_sock_rcv_skb);
998 set_to_dummy_if_null(ops, socket_getpeersec);
999 set_to_dummy_if_null(ops, sk_alloc_security);
1000 set_to_dummy_if_null(ops, sk_free_security);
1001 #endif /* CONFIG_SECURITY_NETWORK */