/* * 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> #include <linux/xattr.h> #include <linux/hugetlb.h> #include <linux/ptrace.h> #include <linux/file.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_raised (tsk->cap_effective, cap)) return 0; 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 dentry *dentry) { return 0; } static int dummy_syslog (int type) { if ((type != 3 && type != 10) && current->euid) return -EPERM; return 0; } static int dummy_settime(struct timespec *ts, struct timezone *tz) { if (!capable(CAP_SYS_TIME)) return -EPERM; return 0; } static int dummy_vm_enough_memory(long pages) { int cap_sys_admin = 0; if (dummy_capable(current, CAP_SYS_ADMIN) == 0) cap_sys_admin = 1; return __vm_enough_memory(pages, cap_sys_admin); } 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_apply_creds (struct linux_binprm *bprm, int unsafe) { if (bprm->e_uid != current->uid || bprm->e_gid != current->gid) { current->mm->dumpable = 0; if ((unsafe & ~LSM_UNSAFE_PTRACE_CAP) && !capable(CAP_SETUID)) { bprm->e_uid = current->uid; bprm->e_gid = current->gid; } } current->suid = current->euid = current->fsuid = bprm->e_uid; current->sgid = current->egid = current->fsgid = bprm->e_gid; dummy_capget(current, ¤t->cap_effective, ¤t->cap_inheritable, ¤t->cap_permitted); } static void dummy_bprm_post_apply_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_copy_data (struct file_system_type *type, void *orig, void *copy) { return 0; } static int dummy_sb_kern_mount (struct super_block *sb, void *data) { 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, struct nameidata *nd) { 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) { if (!strncmp(name, XATTR_SECURITY_PREFIX, sizeof(XATTR_SECURITY_PREFIX) - 1) && !capable(CAP_SYS_ADMIN)) return -EPERM; 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) { if (!strncmp(name, XATTR_SECURITY_PREFIX, sizeof(XATTR_SECURITY_PREFIX) - 1) && !capable(CAP_SYS_ADMIN)) return -EPERM; return 0; } static int dummy_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size) { return -EOPNOTSUPP; } static int dummy_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) { return -EOPNOTSUPP; } static int dummy_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) { 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 reqprot, unsigned long prot, unsigned long flags) { return 0; } static int dummy_file_mprotect (struct vm_area_struct *vma, unsigned long reqprot, 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 sig) { 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) { dummy_capget(current, ¤t->cap_effective, ¤t->cap_inheritable, ¤t->cap_permitted); 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 (struct group_info *group_info) { 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 __user *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 sock *sk, struct sk_buff *skb) { NETLINK_CB(skb).eff_cap = current->cap_effective; 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, int kern) { return 0; } static void dummy_socket_post_create (struct socket *sock, int family, int type, int protocol, int kern) { 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; } static int dummy_socket_getpeersec(struct socket *sock, char __user *optval, int __user *optlen, unsigned len) { return -ENOPROTOOPT; } static inline int dummy_sk_alloc_security (struct sock *sk, int family, int priority) { return 0; } static inline void dummy_sk_free_security (struct sock *sk) { } #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, settime); 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_apply_creds); set_to_dummy_if_null(ops, bprm_post_apply_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_copy_data); 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); set_to_dummy_if_null(ops, socket_getpeersec); set_to_dummy_if_null(ops, sk_alloc_security); set_to_dummy_if_null(ops, sk_free_security); #endif /* CONFIG_SECURITY_NETWORK */ }