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522ed7767e
Add TTY input auditing, used to audit system administrator's actions. This is required by various security standards such as DCID 6/3 and PCI to provide non-repudiation of administrator's actions and to allow a review of past actions if the administrator seems to overstep their duties or if the system becomes misconfigured for unknown reasons. These requirements do not make it necessary to audit TTY output as well. Compared to an user-space keylogger, this approach records TTY input using the audit subsystem, correlated with other audit events, and it is completely transparent to the user-space application (e.g. the console ioctls still work). TTY input auditing works on a higher level than auditing all system calls within the session, which would produce an overwhelming amount of mostly useless audit events. Add an "audit_tty" attribute, inherited across fork (). Data read from TTYs by process with the attribute is sent to the audit subsystem by the kernel. The audit netlink interface is extended to allow modifying the audit_tty attribute, and to allow sending explanatory audit events from user-space (for example, a shell might send an event containing the final command, after the interactive command-line editing and history expansion is performed, which might be difficult to decipher from the TTY input alone). Because the "audit_tty" attribute is inherited across fork (), it would be set e.g. for sshd restarted within an audited session. To prevent this, the audit_tty attribute is cleared when a process with no open TTY file descriptors (e.g. after daemon startup) opens a TTY. See https://www.redhat.com/archives/linux-audit/2007-June/msg00000.html for a more detailed rationale document for an older version of this patch. [akpm@linux-foundation.org: build fix] Signed-off-by: Miloslav Trmac <mitr@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Paul Fulghum <paulkf@microgate.com> Cc: Casey Schaufler <casey@schaufler-ca.com> Cc: Steve Grubb <sgrubb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/* audit -- definition of audit_context structure and supporting types
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*
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* Copyright 2003-2004 Red Hat, Inc.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright 2005 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/audit.h>
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#include <linux/skbuff.h>
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/* 0 = no checking
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1 = put_count checking
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2 = verbose put_count checking
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*/
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#define AUDIT_DEBUG 0
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/* At task start time, the audit_state is set in the audit_context using
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a per-task filter. At syscall entry, the audit_state is augmented by
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the syscall filter. */
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enum audit_state {
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AUDIT_DISABLED, /* Do not create per-task audit_context.
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* No syscall-specific audit records can
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* be generated. */
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AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context,
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* but don't necessarily fill it in at
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* syscall entry time (i.e., filter
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* instead). */
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AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
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* and always fill it in at syscall
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* entry time. This makes a full
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* syscall record available if some
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* other part of the kernel decides it
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* should be recorded. */
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AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
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* always fill it in at syscall entry
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* time, and always write out the audit
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* record at syscall exit time. */
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};
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/* Rule lists */
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struct audit_parent;
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struct audit_watch {
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atomic_t count; /* reference count */
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char *path; /* insertion path */
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dev_t dev; /* associated superblock device */
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unsigned long ino; /* associated inode number */
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struct audit_parent *parent; /* associated parent */
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struct list_head wlist; /* entry in parent->watches list */
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struct list_head rules; /* associated rules */
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};
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struct audit_field {
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u32 type;
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u32 val;
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u32 op;
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char *se_str;
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struct selinux_audit_rule *se_rule;
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};
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struct audit_krule {
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int vers_ops;
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u32 flags;
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u32 listnr;
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u32 action;
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u32 mask[AUDIT_BITMASK_SIZE];
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u32 buflen; /* for data alloc on list rules */
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u32 field_count;
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char *filterkey; /* ties events to rules */
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struct audit_field *fields;
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struct audit_field *arch_f; /* quick access to arch field */
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struct audit_field *inode_f; /* quick access to an inode field */
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struct audit_watch *watch; /* associated watch */
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struct list_head rlist; /* entry in audit_watch.rules list */
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};
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struct audit_entry {
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struct list_head list;
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struct rcu_head rcu;
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struct audit_krule rule;
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};
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extern int audit_pid;
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#define AUDIT_INODE_BUCKETS 32
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extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
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static inline int audit_hash_ino(u32 ino)
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{
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return (ino & (AUDIT_INODE_BUCKETS-1));
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}
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extern int audit_match_class(int class, unsigned syscall);
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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extern int audit_compare_dname_path(const char *dname, const char *path,
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int *dirlen);
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extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_send_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_panic(const char *message);
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struct audit_netlink_list {
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int pid;
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struct sk_buff_head q;
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};
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int audit_send_list(void *);
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struct inotify_watch;
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extern void audit_free_parent(struct inotify_watch *);
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extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
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const char *, struct inode *);
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extern int selinux_audit_rule_update(void);
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#ifdef CONFIG_AUDITSYSCALL
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extern int __audit_signal_info(int sig, struct task_struct *t);
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static inline int audit_signal_info(int sig, struct task_struct *t)
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{
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if (unlikely((audit_pid && t->tgid == audit_pid) ||
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(audit_signals && !audit_dummy_context())))
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return __audit_signal_info(sig, t);
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return 0;
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}
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extern enum audit_state audit_filter_inodes(struct task_struct *,
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struct audit_context *);
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extern void audit_set_auditable(struct audit_context *);
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#else
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#define audit_signal_info(s,t) AUDIT_DISABLED
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#define audit_filter_inodes(t,c) AUDIT_DISABLED
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#define audit_set_auditable(c)
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#endif
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