2 * Capabilities Linux Security Module
4 * This is the default security module in case no other module is loaded.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
13 #include <linux/security.h>
15 static int cap_acct(struct file *file)
20 static int cap_sysctl(ctl_table *table, int op)
25 static int cap_quotactl(int cmds, int type, int id, struct super_block *sb)
30 static int cap_quota_on(struct dentry *dentry)
35 static int cap_bprm_check_security (struct linux_binprm *bprm)
40 static void cap_bprm_committing_creds(struct linux_binprm *bprm)
44 static void cap_bprm_committed_creds(struct linux_binprm *bprm)
48 static int cap_sb_alloc_security(struct super_block *sb)
53 static void cap_sb_free_security(struct super_block *sb)
57 static int cap_sb_copy_data(char *orig, char *copy)
62 static int cap_sb_kern_mount(struct super_block *sb, int flags, void *data)
67 static int cap_sb_show_options(struct seq_file *m, struct super_block *sb)
72 static int cap_sb_statfs(struct dentry *dentry)
77 static int cap_sb_mount(char *dev_name, struct path *path, char *type,
78 unsigned long flags, void *data)
83 static int cap_sb_check_sb(struct vfsmount *mnt, struct path *path)
88 static int cap_sb_umount(struct vfsmount *mnt, int flags)
93 static void cap_sb_umount_close(struct vfsmount *mnt)
97 static void cap_sb_umount_busy(struct vfsmount *mnt)
101 static void cap_sb_post_remount(struct vfsmount *mnt, unsigned long flags,
106 static void cap_sb_post_addmount(struct vfsmount *mnt, struct path *path)
110 static int cap_sb_pivotroot(struct path *old_path, struct path *new_path)
115 static void cap_sb_post_pivotroot(struct path *old_path, struct path *new_path)
119 static int cap_sb_set_mnt_opts(struct super_block *sb,
120 struct security_mnt_opts *opts)
122 if (unlikely(opts->num_mnt_opts))
127 static void cap_sb_clone_mnt_opts(const struct super_block *oldsb,
128 struct super_block *newsb)
132 static int cap_sb_parse_opts_str(char *options, struct security_mnt_opts *opts)
137 static int cap_inode_alloc_security(struct inode *inode)
142 static void cap_inode_free_security(struct inode *inode)
146 static int cap_inode_init_security(struct inode *inode, struct inode *dir,
147 char **name, void **value, size_t *len)
152 static int cap_inode_create(struct inode *inode, struct dentry *dentry,
158 static int cap_inode_link(struct dentry *old_dentry, struct inode *inode,
159 struct dentry *new_dentry)
164 static int cap_inode_unlink(struct inode *inode, struct dentry *dentry)
169 static int cap_inode_symlink(struct inode *inode, struct dentry *dentry,
175 static int cap_inode_mkdir(struct inode *inode, struct dentry *dentry,
181 static int cap_inode_rmdir(struct inode *inode, struct dentry *dentry)
186 static int cap_inode_mknod(struct inode *inode, struct dentry *dentry,
192 static int cap_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
193 struct inode *new_inode, struct dentry *new_dentry)
198 static int cap_inode_readlink(struct dentry *dentry)
203 static int cap_inode_follow_link(struct dentry *dentry,
204 struct nameidata *nameidata)
209 static int cap_inode_permission(struct inode *inode, int mask)
214 static int cap_inode_setattr(struct dentry *dentry, struct iattr *iattr)
219 static int cap_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
224 static void cap_inode_delete(struct inode *ino)
228 static void cap_inode_post_setxattr(struct dentry *dentry, const char *name,
229 const void *value, size_t size, int flags)
233 static int cap_inode_getxattr(struct dentry *dentry, const char *name)
238 static int cap_inode_listxattr(struct dentry *dentry)
243 static int cap_inode_getsecurity(const struct inode *inode, const char *name,
244 void **buffer, bool alloc)
249 static int cap_inode_setsecurity(struct inode *inode, const char *name,
250 const void *value, size_t size, int flags)
255 static int cap_inode_listsecurity(struct inode *inode, char *buffer,
261 static void cap_inode_getsecid(const struct inode *inode, u32 *secid)
266 static int cap_file_permission(struct file *file, int mask)
271 static int cap_file_alloc_security(struct file *file)
276 static void cap_file_free_security(struct file *file)
280 static int cap_file_ioctl(struct file *file, unsigned int command,
286 static int cap_file_mmap(struct file *file, unsigned long reqprot,
287 unsigned long prot, unsigned long flags,
288 unsigned long addr, unsigned long addr_only)
290 if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
295 static int cap_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
301 static int cap_file_lock(struct file *file, unsigned int cmd)
306 static int cap_file_fcntl(struct file *file, unsigned int cmd,
312 static int cap_file_set_fowner(struct file *file)
317 static int cap_file_send_sigiotask(struct task_struct *tsk,
318 struct fown_struct *fown, int sig)
323 static int cap_file_receive(struct file *file)
328 static int cap_dentry_open(struct file *file, const struct cred *cred)
333 static int cap_task_create(unsigned long clone_flags)
338 static void cap_cred_free(struct cred *cred)
342 static int cap_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp)
347 static void cap_cred_commit(struct cred *new, const struct cred *old)
351 static int cap_kernel_act_as(struct cred *new, u32 secid)
356 static int cap_kernel_create_files_as(struct cred *new, struct inode *inode)
361 static int cap_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
366 static int cap_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
371 static int cap_task_setpgid(struct task_struct *p, pid_t pgid)
376 static int cap_task_getpgid(struct task_struct *p)
381 static int cap_task_getsid(struct task_struct *p)
386 static void cap_task_getsecid(struct task_struct *p, u32 *secid)
391 static int cap_task_setgroups(struct group_info *group_info)
396 static int cap_task_getioprio(struct task_struct *p)
401 static int cap_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
406 static int cap_task_getscheduler(struct task_struct *p)
411 static int cap_task_movememory(struct task_struct *p)
416 static int cap_task_wait(struct task_struct *p)
421 static int cap_task_kill(struct task_struct *p, struct siginfo *info,
427 static void cap_task_to_inode(struct task_struct *p, struct inode *inode)
431 static int cap_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
436 static void cap_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
441 static int cap_msg_msg_alloc_security(struct msg_msg *msg)
446 static void cap_msg_msg_free_security(struct msg_msg *msg)
450 static int cap_msg_queue_alloc_security(struct msg_queue *msq)
455 static void cap_msg_queue_free_security(struct msg_queue *msq)
459 static int cap_msg_queue_associate(struct msg_queue *msq, int msqflg)
464 static int cap_msg_queue_msgctl(struct msg_queue *msq, int cmd)
469 static int cap_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
475 static int cap_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
476 struct task_struct *target, long type, int mode)
481 static int cap_shm_alloc_security(struct shmid_kernel *shp)
486 static void cap_shm_free_security(struct shmid_kernel *shp)
490 static int cap_shm_associate(struct shmid_kernel *shp, int shmflg)
495 static int cap_shm_shmctl(struct shmid_kernel *shp, int cmd)
500 static int cap_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
506 static int cap_sem_alloc_security(struct sem_array *sma)
511 static void cap_sem_free_security(struct sem_array *sma)
515 static int cap_sem_associate(struct sem_array *sma, int semflg)
520 static int cap_sem_semctl(struct sem_array *sma, int cmd)
525 static int cap_sem_semop(struct sem_array *sma, struct sembuf *sops,
526 unsigned nsops, int alter)
531 #ifdef CONFIG_SECURITY_NETWORK
532 static int cap_unix_stream_connect(struct socket *sock, struct socket *other,
538 static int cap_unix_may_send(struct socket *sock, struct socket *other)
543 static int cap_socket_create(int family, int type, int protocol, int kern)
548 static int cap_socket_post_create(struct socket *sock, int family, int type,
549 int protocol, int kern)
554 static int cap_socket_bind(struct socket *sock, struct sockaddr *address,
560 static int cap_socket_connect(struct socket *sock, struct sockaddr *address,
566 static int cap_socket_listen(struct socket *sock, int backlog)
571 static int cap_socket_accept(struct socket *sock, struct socket *newsock)
576 static void cap_socket_post_accept(struct socket *sock, struct socket *newsock)
580 static int cap_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
585 static int cap_socket_recvmsg(struct socket *sock, struct msghdr *msg,
591 static int cap_socket_getsockname(struct socket *sock)
596 static int cap_socket_getpeername(struct socket *sock)
601 static int cap_socket_setsockopt(struct socket *sock, int level, int optname)
606 static int cap_socket_getsockopt(struct socket *sock, int level, int optname)
611 static int cap_socket_shutdown(struct socket *sock, int how)
616 static int cap_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
621 static int cap_socket_getpeersec_stream(struct socket *sock,
623 int __user *optlen, unsigned len)
628 static int cap_socket_getpeersec_dgram(struct socket *sock,
629 struct sk_buff *skb, u32 *secid)
634 static int cap_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
639 static void cap_sk_free_security(struct sock *sk)
643 static void cap_sk_clone_security(const struct sock *sk, struct sock *newsk)
647 static void cap_sk_getsecid(struct sock *sk, u32 *secid)
651 static void cap_sock_graft(struct sock *sk, struct socket *parent)
655 static int cap_inet_conn_request(struct sock *sk, struct sk_buff *skb,
656 struct request_sock *req)
661 static void cap_inet_csk_clone(struct sock *newsk,
662 const struct request_sock *req)
666 static void cap_inet_conn_established(struct sock *sk, struct sk_buff *skb)
670 static void cap_req_classify_flow(const struct request_sock *req,
674 #endif /* CONFIG_SECURITY_NETWORK */
676 #ifdef CONFIG_SECURITY_NETWORK_XFRM
677 static int cap_xfrm_policy_alloc_security(struct xfrm_sec_ctx **ctxp,
678 struct xfrm_user_sec_ctx *sec_ctx)
683 static int cap_xfrm_policy_clone_security(struct xfrm_sec_ctx *old_ctx,
684 struct xfrm_sec_ctx **new_ctxp)
689 static void cap_xfrm_policy_free_security(struct xfrm_sec_ctx *ctx)
693 static int cap_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx)
698 static int cap_xfrm_state_alloc_security(struct xfrm_state *x,
699 struct xfrm_user_sec_ctx *sec_ctx,
705 static void cap_xfrm_state_free_security(struct xfrm_state *x)
709 static int cap_xfrm_state_delete_security(struct xfrm_state *x)
714 static int cap_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 sk_sid, u8 dir)
719 static int cap_xfrm_state_pol_flow_match(struct xfrm_state *x,
720 struct xfrm_policy *xp,
726 static int cap_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall)
731 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
732 static void cap_d_instantiate(struct dentry *dentry, struct inode *inode)
736 static int cap_getprocattr(struct task_struct *p, char *name, char **value)
741 static int cap_setprocattr(struct task_struct *p, char *name, void *value,
747 static int cap_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
752 static int cap_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
757 static void cap_release_secctx(char *secdata, u32 seclen)
762 static int cap_key_alloc(struct key *key, const struct cred *cred,
768 static void cap_key_free(struct key *key)
772 static int cap_key_permission(key_ref_t key_ref, const struct cred *cred,
778 static int cap_key_getsecurity(struct key *key, char **_buffer)
784 #endif /* CONFIG_KEYS */
787 static int cap_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
792 static int cap_audit_rule_known(struct audit_krule *krule)
797 static int cap_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
798 struct audit_context *actx)
803 static void cap_audit_rule_free(void *lsmrule)
806 #endif /* CONFIG_AUDIT */
808 struct security_operations default_security_ops = {
812 #define set_to_cap_if_null(ops, function) \
814 if (!ops->function) { \
815 ops->function = cap_##function; \
816 pr_debug("Had to override the " #function \
817 " security operation with the default.\n");\
821 void security_fixup_ops(struct security_operations *ops)
823 set_to_cap_if_null(ops, ptrace_may_access);
824 set_to_cap_if_null(ops, ptrace_traceme);
825 set_to_cap_if_null(ops, capget);
826 set_to_cap_if_null(ops, capset);
827 set_to_cap_if_null(ops, acct);
828 set_to_cap_if_null(ops, capable);
829 set_to_cap_if_null(ops, quotactl);
830 set_to_cap_if_null(ops, quota_on);
831 set_to_cap_if_null(ops, sysctl);
832 set_to_cap_if_null(ops, syslog);
833 set_to_cap_if_null(ops, settime);
834 set_to_cap_if_null(ops, vm_enough_memory);
835 set_to_cap_if_null(ops, bprm_set_creds);
836 set_to_cap_if_null(ops, bprm_committing_creds);
837 set_to_cap_if_null(ops, bprm_committed_creds);
838 set_to_cap_if_null(ops, bprm_check_security);
839 set_to_cap_if_null(ops, bprm_secureexec);
840 set_to_cap_if_null(ops, sb_alloc_security);
841 set_to_cap_if_null(ops, sb_free_security);
842 set_to_cap_if_null(ops, sb_copy_data);
843 set_to_cap_if_null(ops, sb_kern_mount);
844 set_to_cap_if_null(ops, sb_show_options);
845 set_to_cap_if_null(ops, sb_statfs);
846 set_to_cap_if_null(ops, sb_mount);
847 set_to_cap_if_null(ops, sb_check_sb);
848 set_to_cap_if_null(ops, sb_umount);
849 set_to_cap_if_null(ops, sb_umount_close);
850 set_to_cap_if_null(ops, sb_umount_busy);
851 set_to_cap_if_null(ops, sb_post_remount);
852 set_to_cap_if_null(ops, sb_post_addmount);
853 set_to_cap_if_null(ops, sb_pivotroot);
854 set_to_cap_if_null(ops, sb_post_pivotroot);
855 set_to_cap_if_null(ops, sb_set_mnt_opts);
856 set_to_cap_if_null(ops, sb_clone_mnt_opts);
857 set_to_cap_if_null(ops, sb_parse_opts_str);
858 set_to_cap_if_null(ops, inode_alloc_security);
859 set_to_cap_if_null(ops, inode_free_security);
860 set_to_cap_if_null(ops, inode_init_security);
861 set_to_cap_if_null(ops, inode_create);
862 set_to_cap_if_null(ops, inode_link);
863 set_to_cap_if_null(ops, inode_unlink);
864 set_to_cap_if_null(ops, inode_symlink);
865 set_to_cap_if_null(ops, inode_mkdir);
866 set_to_cap_if_null(ops, inode_rmdir);
867 set_to_cap_if_null(ops, inode_mknod);
868 set_to_cap_if_null(ops, inode_rename);
869 set_to_cap_if_null(ops, inode_readlink);
870 set_to_cap_if_null(ops, inode_follow_link);
871 set_to_cap_if_null(ops, inode_permission);
872 set_to_cap_if_null(ops, inode_setattr);
873 set_to_cap_if_null(ops, inode_getattr);
874 set_to_cap_if_null(ops, inode_delete);
875 set_to_cap_if_null(ops, inode_setxattr);
876 set_to_cap_if_null(ops, inode_post_setxattr);
877 set_to_cap_if_null(ops, inode_getxattr);
878 set_to_cap_if_null(ops, inode_listxattr);
879 set_to_cap_if_null(ops, inode_removexattr);
880 set_to_cap_if_null(ops, inode_need_killpriv);
881 set_to_cap_if_null(ops, inode_killpriv);
882 set_to_cap_if_null(ops, inode_getsecurity);
883 set_to_cap_if_null(ops, inode_setsecurity);
884 set_to_cap_if_null(ops, inode_listsecurity);
885 set_to_cap_if_null(ops, inode_getsecid);
886 set_to_cap_if_null(ops, file_permission);
887 set_to_cap_if_null(ops, file_alloc_security);
888 set_to_cap_if_null(ops, file_free_security);
889 set_to_cap_if_null(ops, file_ioctl);
890 set_to_cap_if_null(ops, file_mmap);
891 set_to_cap_if_null(ops, file_mprotect);
892 set_to_cap_if_null(ops, file_lock);
893 set_to_cap_if_null(ops, file_fcntl);
894 set_to_cap_if_null(ops, file_set_fowner);
895 set_to_cap_if_null(ops, file_send_sigiotask);
896 set_to_cap_if_null(ops, file_receive);
897 set_to_cap_if_null(ops, dentry_open);
898 set_to_cap_if_null(ops, task_create);
899 set_to_cap_if_null(ops, cred_free);
900 set_to_cap_if_null(ops, cred_prepare);
901 set_to_cap_if_null(ops, cred_commit);
902 set_to_cap_if_null(ops, kernel_act_as);
903 set_to_cap_if_null(ops, kernel_create_files_as);
904 set_to_cap_if_null(ops, task_setuid);
905 set_to_cap_if_null(ops, task_fix_setuid);
906 set_to_cap_if_null(ops, task_setgid);
907 set_to_cap_if_null(ops, task_setpgid);
908 set_to_cap_if_null(ops, task_getpgid);
909 set_to_cap_if_null(ops, task_getsid);
910 set_to_cap_if_null(ops, task_getsecid);
911 set_to_cap_if_null(ops, task_setgroups);
912 set_to_cap_if_null(ops, task_setnice);
913 set_to_cap_if_null(ops, task_setioprio);
914 set_to_cap_if_null(ops, task_getioprio);
915 set_to_cap_if_null(ops, task_setrlimit);
916 set_to_cap_if_null(ops, task_setscheduler);
917 set_to_cap_if_null(ops, task_getscheduler);
918 set_to_cap_if_null(ops, task_movememory);
919 set_to_cap_if_null(ops, task_wait);
920 set_to_cap_if_null(ops, task_kill);
921 set_to_cap_if_null(ops, task_prctl);
922 set_to_cap_if_null(ops, task_to_inode);
923 set_to_cap_if_null(ops, ipc_permission);
924 set_to_cap_if_null(ops, ipc_getsecid);
925 set_to_cap_if_null(ops, msg_msg_alloc_security);
926 set_to_cap_if_null(ops, msg_msg_free_security);
927 set_to_cap_if_null(ops, msg_queue_alloc_security);
928 set_to_cap_if_null(ops, msg_queue_free_security);
929 set_to_cap_if_null(ops, msg_queue_associate);
930 set_to_cap_if_null(ops, msg_queue_msgctl);
931 set_to_cap_if_null(ops, msg_queue_msgsnd);
932 set_to_cap_if_null(ops, msg_queue_msgrcv);
933 set_to_cap_if_null(ops, shm_alloc_security);
934 set_to_cap_if_null(ops, shm_free_security);
935 set_to_cap_if_null(ops, shm_associate);
936 set_to_cap_if_null(ops, shm_shmctl);
937 set_to_cap_if_null(ops, shm_shmat);
938 set_to_cap_if_null(ops, sem_alloc_security);
939 set_to_cap_if_null(ops, sem_free_security);
940 set_to_cap_if_null(ops, sem_associate);
941 set_to_cap_if_null(ops, sem_semctl);
942 set_to_cap_if_null(ops, sem_semop);
943 set_to_cap_if_null(ops, netlink_send);
944 set_to_cap_if_null(ops, netlink_recv);
945 set_to_cap_if_null(ops, d_instantiate);
946 set_to_cap_if_null(ops, getprocattr);
947 set_to_cap_if_null(ops, setprocattr);
948 set_to_cap_if_null(ops, secid_to_secctx);
949 set_to_cap_if_null(ops, secctx_to_secid);
950 set_to_cap_if_null(ops, release_secctx);
951 #ifdef CONFIG_SECURITY_NETWORK
952 set_to_cap_if_null(ops, unix_stream_connect);
953 set_to_cap_if_null(ops, unix_may_send);
954 set_to_cap_if_null(ops, socket_create);
955 set_to_cap_if_null(ops, socket_post_create);
956 set_to_cap_if_null(ops, socket_bind);
957 set_to_cap_if_null(ops, socket_connect);
958 set_to_cap_if_null(ops, socket_listen);
959 set_to_cap_if_null(ops, socket_accept);
960 set_to_cap_if_null(ops, socket_post_accept);
961 set_to_cap_if_null(ops, socket_sendmsg);
962 set_to_cap_if_null(ops, socket_recvmsg);
963 set_to_cap_if_null(ops, socket_getsockname);
964 set_to_cap_if_null(ops, socket_getpeername);
965 set_to_cap_if_null(ops, socket_setsockopt);
966 set_to_cap_if_null(ops, socket_getsockopt);
967 set_to_cap_if_null(ops, socket_shutdown);
968 set_to_cap_if_null(ops, socket_sock_rcv_skb);
969 set_to_cap_if_null(ops, socket_getpeersec_stream);
970 set_to_cap_if_null(ops, socket_getpeersec_dgram);
971 set_to_cap_if_null(ops, sk_alloc_security);
972 set_to_cap_if_null(ops, sk_free_security);
973 set_to_cap_if_null(ops, sk_clone_security);
974 set_to_cap_if_null(ops, sk_getsecid);
975 set_to_cap_if_null(ops, sock_graft);
976 set_to_cap_if_null(ops, inet_conn_request);
977 set_to_cap_if_null(ops, inet_csk_clone);
978 set_to_cap_if_null(ops, inet_conn_established);
979 set_to_cap_if_null(ops, req_classify_flow);
980 #endif /* CONFIG_SECURITY_NETWORK */
981 #ifdef CONFIG_SECURITY_NETWORK_XFRM
982 set_to_cap_if_null(ops, xfrm_policy_alloc_security);
983 set_to_cap_if_null(ops, xfrm_policy_clone_security);
984 set_to_cap_if_null(ops, xfrm_policy_free_security);
985 set_to_cap_if_null(ops, xfrm_policy_delete_security);
986 set_to_cap_if_null(ops, xfrm_state_alloc_security);
987 set_to_cap_if_null(ops, xfrm_state_free_security);
988 set_to_cap_if_null(ops, xfrm_state_delete_security);
989 set_to_cap_if_null(ops, xfrm_policy_lookup);
990 set_to_cap_if_null(ops, xfrm_state_pol_flow_match);
991 set_to_cap_if_null(ops, xfrm_decode_session);
992 #endif /* CONFIG_SECURITY_NETWORK_XFRM */
994 set_to_cap_if_null(ops, key_alloc);
995 set_to_cap_if_null(ops, key_free);
996 set_to_cap_if_null(ops, key_permission);
997 set_to_cap_if_null(ops, key_getsecurity);
998 #endif /* CONFIG_KEYS */
1000 set_to_cap_if_null(ops, audit_rule_init);
1001 set_to_cap_if_null(ops, audit_rule_known);
1002 set_to_cap_if_null(ops, audit_rule_match);
1003 set_to_cap_if_null(ops, audit_rule_free);