/* * Capabilities Linux Security Module * * This is the default security module in case no other module is loaded. * * 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. * */ #include <linux/security.h> static int cap_acct(struct file *file) { return 0; } static int cap_sysctl(ctl_table *table, int op) { return 0; } static int cap_quotactl(int cmds, int type, int id, struct super_block *sb) { return 0; } static int cap_quota_on(struct dentry *dentry) { return 0; } static int cap_bprm_alloc_security(struct linux_binprm *bprm) { return 0; } static void cap_bprm_free_security(struct linux_binprm *bprm) { } static void cap_bprm_post_apply_creds(struct linux_binprm *bprm) { } static int cap_bprm_check_security(struct linux_binprm *bprm) { return 0; } static int cap_sb_alloc_security(struct super_block *sb) { return 0; } static void cap_sb_free_security(struct super_block *sb) { } static int cap_sb_copy_data(char *orig, char *copy) { return 0; } static int cap_sb_kern_mount(struct super_block *sb, void *data) { return 0; } static int cap_sb_show_options(struct seq_file *m, struct super_block *sb) { return 0; } static int cap_sb_statfs(struct dentry *dentry) { return 0; } static int cap_sb_mount(char *dev_name, struct path *path, char *type, unsigned long flags, void *data) { return 0; } static int cap_sb_check_sb(struct vfsmount *mnt, struct path *path) { return 0; } static int cap_sb_umount(struct vfsmount *mnt, int flags) { return 0; } static void cap_sb_umount_close(struct vfsmount *mnt) { } static void cap_sb_umount_busy(struct vfsmount *mnt) { } static void cap_sb_post_remount(struct vfsmount *mnt, unsigned long flags, void *data) { } static void cap_sb_post_addmount(struct vfsmount *mnt, struct path *path) { } static int cap_sb_pivotroot(struct path *old_path, struct path *new_path) { return 0; } static void cap_sb_post_pivotroot(struct path *old_path, struct path *new_path) { } static int cap_sb_set_mnt_opts(struct super_block *sb, struct security_mnt_opts *opts) { if (unlikely(opts->num_mnt_opts)) return -EOPNOTSUPP; return 0; } static void cap_sb_clone_mnt_opts(const struct super_block *oldsb, struct super_block *newsb) { } static int cap_sb_parse_opts_str(char *options, struct security_mnt_opts *opts) { return 0; } static int cap_inode_alloc_security(struct inode *inode) { return 0; } static void cap_inode_free_security(struct inode *inode) { } static int cap_inode_init_security(struct inode *inode, struct inode *dir, char **name, void **value, size_t *len) { return -EOPNOTSUPP; } static int cap_inode_create(struct inode *inode, struct dentry *dentry, int mask) { return 0; } static int cap_inode_link(struct dentry *old_dentry, struct inode *inode, struct dentry *new_dentry) { return 0; } static int cap_inode_unlink(struct inode *inode, struct dentry *dentry) { return 0; } static int cap_inode_symlink(struct inode *inode, struct dentry *dentry, const char *name) { return 0; } static int cap_inode_mkdir(struct inode *inode, struct dentry *dentry, int mask) { return 0; } static int cap_inode_rmdir(struct inode *inode, struct dentry *dentry) { return 0; } static int cap_inode_mknod(struct inode *inode, struct dentry *dentry, int mode, dev_t dev) { return 0; } static int cap_inode_rename(struct inode *old_inode, struct dentry *old_dentry, struct inode *new_inode, struct dentry *new_dentry) { return 0; } static int cap_inode_readlink(struct dentry *dentry) { return 0; } static int cap_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) { return 0; } static int cap_inode_permission(struct inode *inode, int mask, struct nameidata *nd) { return 0; } static int cap_inode_setattr(struct dentry *dentry, struct iattr *iattr) { return 0; } static int cap_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) { return 0; } static void cap_inode_delete(struct inode *ino) { } static void cap_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { } static int cap_inode_getxattr(struct dentry *dentry, const char *name) { return 0; } static int cap_inode_listxattr(struct dentry *dentry) { return 0; } static int cap_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) { return -EOPNOTSUPP; } static int cap_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static int cap_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) { return 0; } static void cap_inode_getsecid(const struct inode *inode, u32 *secid) { *secid = 0; } static int cap_file_permission(struct file *file, int mask) { return 0; } static int cap_file_alloc_security(struct file *file) { return 0; } static void cap_file_free_security(struct file *file) { } static int cap_file_ioctl(struct file *file, unsigned int command, unsigned long arg) { return 0; } static int cap_file_mmap(struct file *file, unsigned long reqprot, unsigned long prot, unsigned long flags, unsigned long addr, unsigned long addr_only) { if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO)) return -EACCES; return 0; } static int cap_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, unsigned long prot) { return 0; } static int cap_file_lock(struct file *file, unsigned int cmd) { return 0; } static int cap_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg) { return 0; } static int cap_file_set_fowner(struct file *file) { return 0; } static int cap_file_send_sigiotask(struct task_struct *tsk, struct fown_struct *fown, int sig) { return 0; } static int cap_file_receive(struct file *file) { return 0; } static int cap_dentry_open(struct file *file) { return 0; } static int cap_task_create(unsigned long clone_flags) { return 0; } static int cap_task_alloc_security(struct task_struct *p) { return 0; } static void cap_task_free_security(struct task_struct *p) { } static int cap_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags) { return 0; } static int cap_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags) { return 0; } static int cap_task_setpgid(struct task_struct *p, pid_t pgid) { return 0; } static int cap_task_getpgid(struct task_struct *p) { return 0; } static int cap_task_getsid(struct task_struct *p) { return 0; } static void cap_task_getsecid(struct task_struct *p, u32 *secid) { *secid = 0; } static int cap_task_setgroups(struct group_info *group_info) { return 0; } static int cap_task_getioprio(struct task_struct *p) { return 0; } static int cap_task_setrlimit(unsigned int resource, struct rlimit *new_rlim) { return 0; } static int cap_task_getscheduler(struct task_struct *p) { return 0; } static int cap_task_movememory(struct task_struct *p) { return 0; } static int cap_task_wait(struct task_struct *p) { return 0; } static int cap_task_kill(struct task_struct *p, struct siginfo *info, int sig, u32 secid) { return 0; } static void cap_task_to_inode(struct task_struct *p, struct inode *inode) { } static int cap_ipc_permission(struct kern_ipc_perm *ipcp, short flag) { return 0; } static void cap_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) { *secid = 0; } static int cap_msg_msg_alloc_security(struct msg_msg *msg) { return 0; } static void cap_msg_msg_free_security(struct msg_msg *msg) { } static int cap_msg_queue_alloc_security(struct msg_queue *msq) { return 0; } static void cap_msg_queue_free_security(struct msg_queue *msq) { } static int cap_msg_queue_associate(struct msg_queue *msq, int msqflg) { return 0; } static int cap_msg_queue_msgctl(struct msg_queue *msq, int cmd) { return 0; } static int cap_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msgflg) { return 0; } static int cap_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, struct task_struct *target, long type, int mode) { return 0; } static int cap_shm_alloc_security(struct shmid_kernel *shp) { return 0; } static void cap_shm_free_security(struct shmid_kernel *shp) { } static int cap_shm_associate(struct shmid_kernel *shp, int shmflg) { return 0; } static int cap_shm_shmctl(struct shmid_kernel *shp, int cmd) { return 0; } static int cap_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, int shmflg) { return 0; } static int cap_sem_alloc_security(struct sem_array *sma) { return 0; } static void cap_sem_free_security(struct sem_array *sma) { } static int cap_sem_associate(struct sem_array *sma, int semflg) { return 0; } static int cap_sem_semctl(struct sem_array *sma, int cmd) { return 0; } static int cap_sem_semop(struct sem_array *sma, struct sembuf *sops, unsigned nsops, int alter) { return 0; } #ifdef CONFIG_SECURITY_NETWORK static int cap_unix_stream_connect(struct socket *sock, struct socket *other, struct sock *newsk) { return 0; } static int cap_unix_may_send(struct socket *sock, struct socket *other) { return 0; } static int cap_socket_create(int family, int type, int protocol, int kern) { return 0; } static int cap_socket_post_create(struct socket *sock, int family, int type, int protocol, int kern) { return 0; } static int cap_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) { return 0; } static int cap_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) { return 0; } static int cap_socket_listen(struct socket *sock, int backlog) { return 0; } static int cap_socket_accept(struct socket *sock, struct socket *newsock) { return 0; } static void cap_socket_post_accept(struct socket *sock, struct socket *newsock) { } static int cap_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size) { return 0; } static int cap_socket_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags) { return 0; } static int cap_socket_getsockname(struct socket *sock) { return 0; } static int cap_socket_getpeername(struct socket *sock) { return 0; } static int cap_socket_setsockopt(struct socket *sock, int level, int optname) { return 0; } static int cap_socket_getsockopt(struct socket *sock, int level, int optname) { return 0; } static int cap_socket_shutdown(struct socket *sock, int how) { return 0; } static int cap_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) { return 0; } static int cap_socket_getpeersec_stream(struct socket *sock, char __user *optval, int __user *optlen, unsigned len) { return -ENOPROTOOPT; } static int cap_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) { return -ENOPROTOOPT; } static int cap_sk_alloc_security(struct sock *sk, int family, gfp_t priority) { return 0; } static void cap_sk_free_security(struct sock *sk) { } static void cap_sk_clone_security(const struct sock *sk, struct sock *newsk) { } static void cap_sk_getsecid(struct sock *sk, u32 *secid) { } static void cap_sock_graft(struct sock *sk, struct socket *parent) { } static int cap_inet_conn_request(struct sock *sk, struct sk_buff *skb, struct request_sock *req) { return 0; } static void cap_inet_csk_clone(struct sock *newsk, const struct request_sock *req) { } static void cap_inet_conn_established(struct sock *sk, struct sk_buff *skb) { } static void cap_req_classify_flow(const struct request_sock *req, struct flowi *fl) { } #endif /* CONFIG_SECURITY_NETWORK */ #ifdef CONFIG_SECURITY_NETWORK_XFRM static int cap_xfrm_policy_alloc_security(struct xfrm_sec_ctx **ctxp, struct xfrm_user_sec_ctx *sec_ctx) { return 0; } static int cap_xfrm_policy_clone_security(struct xfrm_sec_ctx *old_ctx, struct xfrm_sec_ctx **new_ctxp) { return 0; } static void cap_xfrm_policy_free_security(struct xfrm_sec_ctx *ctx) { } static int cap_xfrm_policy_delete_security(struct xfrm_sec_ctx *ctx) { return 0; } static int cap_xfrm_state_alloc_security(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx, u32 secid) { return 0; } static void cap_xfrm_state_free_security(struct xfrm_state *x) { } static int cap_xfrm_state_delete_security(struct xfrm_state *x) { return 0; } static int cap_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 sk_sid, u8 dir) { return 0; } static int cap_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *xp, struct flowi *fl) { return 1; } static int cap_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall) { return 0; } #endif /* CONFIG_SECURITY_NETWORK_XFRM */ static void cap_d_instantiate(struct dentry *dentry, struct inode *inode) { } static int cap_getprocattr(struct task_struct *p, char *name, char **value) { return -EINVAL; } static int cap_setprocattr(struct task_struct *p, char *name, void *value, size_t size) { return -EINVAL; } static int cap_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) { return -EOPNOTSUPP; } static int cap_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) { return -EOPNOTSUPP; } static void cap_release_secctx(char *secdata, u32 seclen) { } #ifdef CONFIG_KEYS static int cap_key_alloc(struct key *key, struct task_struct *ctx, unsigned long flags) { return 0; } static void cap_key_free(struct key *key) { } static int cap_key_permission(key_ref_t key_ref, struct task_struct *context, key_perm_t perm) { return 0; } static int cap_key_getsecurity(struct key *key, char **_buffer) { *_buffer = NULL; return 0; } #endif /* CONFIG_KEYS */ #ifdef CONFIG_AUDIT static int cap_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) { return 0; } static int cap_audit_rule_known(struct audit_krule *krule) { return 0; } static int cap_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule, struct audit_context *actx) { return 0; } static void cap_audit_rule_free(void *lsmrule) { } #endif /* CONFIG_AUDIT */ struct security_operations default_security_ops = { .name = "default", }; #define set_to_cap_if_null(ops, function) \ do { \ if (!ops->function) { \ ops->function = cap_##function; \ pr_debug("Had to override the " #function \ " security operation with the default.\n");\ } \ } while (0) void security_fixup_ops(struct security_operations *ops) { set_to_cap_if_null(ops, ptrace); set_to_cap_if_null(ops, capget); set_to_cap_if_null(ops, capset_check); set_to_cap_if_null(ops, capset_set); set_to_cap_if_null(ops, acct); set_to_cap_if_null(ops, capable); set_to_cap_if_null(ops, quotactl); set_to_cap_if_null(ops, quota_on); set_to_cap_if_null(ops, sysctl); set_to_cap_if_null(ops, syslog); set_to_cap_if_null(ops, settime); set_to_cap_if_null(ops, vm_enough_memory); set_to_cap_if_null(ops, bprm_alloc_security); set_to_cap_if_null(ops, bprm_free_security); set_to_cap_if_null(ops, bprm_apply_creds); set_to_cap_if_null(ops, bprm_post_apply_creds); set_to_cap_if_null(ops, bprm_set_security); set_to_cap_if_null(ops, bprm_check_security); set_to_cap_if_null(ops, bprm_secureexec); set_to_cap_if_null(ops, sb_alloc_security); set_to_cap_if_null(ops, sb_free_security); set_to_cap_if_null(ops, sb_copy_data); set_to_cap_if_null(ops, sb_kern_mount); set_to_cap_if_null(ops, sb_show_options); set_to_cap_if_null(ops, sb_statfs); set_to_cap_if_null(ops, sb_mount); set_to_cap_if_null(ops, sb_check_sb); set_to_cap_if_null(ops, sb_umount); set_to_cap_if_null(ops, sb_umount_close); set_to_cap_if_null(ops, sb_umount_busy); set_to_cap_if_null(ops, sb_post_remount); set_to_cap_if_null(ops, sb_post_addmount); set_to_cap_if_null(ops, sb_pivotroot); set_to_cap_if_null(ops, sb_post_pivotroot); set_to_cap_if_null(ops, sb_set_mnt_opts); set_to_cap_if_null(ops, sb_clone_mnt_opts); set_to_cap_if_null(ops, sb_parse_opts_str); set_to_cap_if_null(ops, inode_alloc_security); set_to_cap_if_null(ops, inode_free_security); set_to_cap_if_null(ops, inode_init_security); set_to_cap_if_null(ops, inode_create); set_to_cap_if_null(ops, inode_link); set_to_cap_if_null(ops, inode_unlink); set_to_cap_if_null(ops, inode_symlink); set_to_cap_if_null(ops, inode_mkdir); set_to_cap_if_null(ops, inode_rmdir); set_to_cap_if_null(ops, inode_mknod); set_to_cap_if_null(ops, inode_rename); set_to_cap_if_null(ops, inode_readlink); set_to_cap_if_null(ops, inode_follow_link); set_to_cap_if_null(ops, inode_permission); set_to_cap_if_null(ops, inode_setattr); set_to_cap_if_null(ops, inode_getattr); set_to_cap_if_null(ops, inode_delete); set_to_cap_if_null(ops, inode_setxattr); set_to_cap_if_null(ops, inode_post_setxattr); set_to_cap_if_null(ops, inode_getxattr); set_to_cap_if_null(ops, inode_listxattr); set_to_cap_if_null(ops, inode_removexattr); set_to_cap_if_null(ops, inode_need_killpriv); set_to_cap_if_null(ops, inode_killpriv); set_to_cap_if_null(ops, inode_getsecurity); set_to_cap_if_null(ops, inode_setsecurity); set_to_cap_if_null(ops, inode_listsecurity); set_to_cap_if_null(ops, inode_getsecid); set_to_cap_if_null(ops, file_permission); set_to_cap_if_null(ops, file_alloc_security); set_to_cap_if_null(ops, file_free_security); set_to_cap_if_null(ops, file_ioctl); set_to_cap_if_null(ops, file_mmap); set_to_cap_if_null(ops, file_mprotect); set_to_cap_if_null(ops, file_lock); set_to_cap_if_null(ops, file_fcntl); set_to_cap_if_null(ops, file_set_fowner); set_to_cap_if_null(ops, file_send_sigiotask); set_to_cap_if_null(ops, file_receive); set_to_cap_if_null(ops, dentry_open); set_to_cap_if_null(ops, task_create); set_to_cap_if_null(ops, task_alloc_security); set_to_cap_if_null(ops, task_free_security); set_to_cap_if_null(ops, task_setuid); set_to_cap_if_null(ops, task_post_setuid); set_to_cap_if_null(ops, task_setgid); set_to_cap_if_null(ops, task_setpgid); set_to_cap_if_null(ops, task_getpgid); set_to_cap_if_null(ops, task_getsid); set_to_cap_if_null(ops, task_getsecid); set_to_cap_if_null(ops, task_setgroups); set_to_cap_if_null(ops, task_setnice); set_to_cap_if_null(ops, task_setioprio); set_to_cap_if_null(ops, task_getioprio); set_to_cap_if_null(ops, task_setrlimit); set_to_cap_if_null(ops, task_setscheduler); set_to_cap_if_null(ops, task_getscheduler); set_to_cap_if_null(ops, task_movememory); set_to_cap_if_null(ops, task_wait); set_to_cap_if_null(ops, task_kill); set_to_cap_if_null(ops, task_prctl); set_to_cap_if_null(ops, task_reparent_to_init); set_to_cap_if_null(ops, task_to_inode); set_to_cap_if_null(ops, ipc_permission); set_to_cap_if_null(ops, ipc_getsecid); set_to_cap_if_null(ops, msg_msg_alloc_security); set_to_cap_if_null(ops, msg_msg_free_security); set_to_cap_if_null(ops, msg_queue_alloc_security); set_to_cap_if_null(ops, msg_queue_free_security); set_to_cap_if_null(ops, msg_queue_associate); set_to_cap_if_null(ops, msg_queue_msgctl); set_to_cap_if_null(ops, msg_queue_msgsnd); set_to_cap_if_null(ops, msg_queue_msgrcv); set_to_cap_if_null(ops, shm_alloc_security); set_to_cap_if_null(ops, shm_free_security); set_to_cap_if_null(ops, shm_associate); set_to_cap_if_null(ops, shm_shmctl); set_to_cap_if_null(ops, shm_shmat); set_to_cap_if_null(ops, sem_alloc_security); set_to_cap_if_null(ops, sem_free_security); set_to_cap_if_null(ops, sem_associate); set_to_cap_if_null(ops, sem_semctl); set_to_cap_if_null(ops, sem_semop); set_to_cap_if_null(ops, netlink_send); set_to_cap_if_null(ops, netlink_recv); set_to_cap_if_null(ops, d_instantiate); set_to_cap_if_null(ops, getprocattr); set_to_cap_if_null(ops, setprocattr); set_to_cap_if_null(ops, secid_to_secctx); set_to_cap_if_null(ops, secctx_to_secid); set_to_cap_if_null(ops, release_secctx); #ifdef CONFIG_SECURITY_NETWORK set_to_cap_if_null(ops, unix_stream_connect); set_to_cap_if_null(ops, unix_may_send); set_to_cap_if_null(ops, socket_create); set_to_cap_if_null(ops, socket_post_create); set_to_cap_if_null(ops, socket_bind); set_to_cap_if_null(ops, socket_connect); set_to_cap_if_null(ops, socket_listen); set_to_cap_if_null(ops, socket_accept); set_to_cap_if_null(ops, socket_post_accept); set_to_cap_if_null(ops, socket_sendmsg); set_to_cap_if_null(ops, socket_recvmsg); set_to_cap_if_null(ops, socket_getsockname); set_to_cap_if_null(ops, socket_getpeername); set_to_cap_if_null(ops, socket_setsockopt); set_to_cap_if_null(ops, socket_getsockopt); set_to_cap_if_null(ops, socket_shutdown); set_to_cap_if_null(ops, socket_sock_rcv_skb); set_to_cap_if_null(ops, socket_getpeersec_stream); set_to_cap_if_null(ops, socket_getpeersec_dgram); set_to_cap_if_null(ops, sk_alloc_security); set_to_cap_if_null(ops, sk_free_security); set_to_cap_if_null(ops, sk_clone_security); set_to_cap_if_null(ops, sk_getsecid); set_to_cap_if_null(ops, sock_graft); set_to_cap_if_null(ops, inet_conn_request); set_to_cap_if_null(ops, inet_csk_clone); set_to_cap_if_null(ops, inet_conn_established); set_to_cap_if_null(ops, req_classify_flow); #endif /* CONFIG_SECURITY_NETWORK */ #ifdef CONFIG_SECURITY_NETWORK_XFRM set_to_cap_if_null(ops, xfrm_policy_alloc_security); set_to_cap_if_null(ops, xfrm_policy_clone_security); set_to_cap_if_null(ops, xfrm_policy_free_security); set_to_cap_if_null(ops, xfrm_policy_delete_security); set_to_cap_if_null(ops, xfrm_state_alloc_security); set_to_cap_if_null(ops, xfrm_state_free_security); set_to_cap_if_null(ops, xfrm_state_delete_security); set_to_cap_if_null(ops, xfrm_policy_lookup); set_to_cap_if_null(ops, xfrm_state_pol_flow_match); set_to_cap_if_null(ops, xfrm_decode_session); #endif /* CONFIG_SECURITY_NETWORK_XFRM */ #ifdef CONFIG_KEYS set_to_cap_if_null(ops, key_alloc); set_to_cap_if_null(ops, key_free); set_to_cap_if_null(ops, key_permission); set_to_cap_if_null(ops, key_getsecurity); #endif /* CONFIG_KEYS */ #ifdef CONFIG_AUDIT set_to_cap_if_null(ops, audit_rule_init); set_to_cap_if_null(ops, audit_rule_known); set_to_cap_if_null(ops, audit_rule_match); set_to_cap_if_null(ops, audit_rule_free); #endif }