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kernel/audit.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* audit.c -- Auditing support |
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* Gateway between the kernel (e.g., selinux) and the user-space audit daemon. * System-call specific features have moved to auditsc.c * |
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* Copyright 2003-2007 Red Hat Inc., Durham, North Carolina. |
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* All Rights Reserved. * |
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* Written by Rickard E. (Rik) Faith <faith@redhat.com> * |
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* Goals: 1) Integrate fully with Security Modules. |
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* 2) Minimal run-time overhead: * a) Minimal when syscall auditing is disabled (audit_enable=0). * b) Small when syscall auditing is enabled and no audit record * is generated (defer as much work as possible to record * generation time): * i) context is allocated, * ii) names from getname are stored without a copy, and * iii) inode information stored from path_lookup. * 3) Ability to disable syscall auditing at boot time (audit=0). * 4) Usable by other parts of the kernel (if audit_log* is called, * then a syscall record will be generated automatically for the * current syscall). * 5) Netlink interface to user-space. * 6) Support low-overhead kernel-based filtering to minimize the * information that must be passed to user-space. * |
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* Audit userspace, documentation, tests, and bug/issue trackers: * https://github.com/linux-audit |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/file.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/atomic.h> |
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#include <linux/mm.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> #include <linux/kthread.h> |
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#include <linux/kernel.h> |
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#include <linux/syscalls.h> |
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#include <linux/spinlock.h> #include <linux/rcupdate.h> #include <linux/mutex.h> #include <linux/gfp.h> |
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#include <linux/pid.h> |
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#include <linux/audit.h> #include <net/sock.h> |
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#include <net/netlink.h> |
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#include <linux/skbuff.h> |
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#ifdef CONFIG_SECURITY #include <linux/security.h> #endif |
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#include <linux/freezer.h> |
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#include <linux/pid_namespace.h> |
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#include <net/netns/generic.h> |
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#include "audit.h" |
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|
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/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED. |
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* (Initialization happens after skb_init is called.) */ |
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#define AUDIT_DISABLED -1 #define AUDIT_UNINITIALIZED 0 #define AUDIT_INITIALIZED 1 |
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static int audit_initialized; |
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u32 audit_enabled = AUDIT_OFF; |
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bool audit_ever_enabled = !!AUDIT_OFF; |
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EXPORT_SYMBOL_GPL(audit_enabled); |
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/* Default state when kernel boots without any parameters. */ |
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static u32 audit_default = AUDIT_OFF; |
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/* If auditing cannot proceed, audit_failure selects what happens. */ |
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static u32 audit_failure = AUDIT_FAIL_PRINTK; |
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/* private audit network namespace index */ static unsigned int audit_net_id; /** * struct audit_net - audit private network namespace data * @sk: communication socket */ struct audit_net { struct sock *sk; }; /** * struct auditd_connection - kernel/auditd connection state * @pid: auditd PID * @portid: netlink portid * @net: the associated network namespace |
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* @rcu: RCU head |
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* * Description: * This struct is RCU protected; you must either hold the RCU lock for reading |
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* or the associated spinlock for writing. |
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*/ |
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struct auditd_connection { |
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struct pid *pid; |
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u32 portid; struct net *net; |
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struct rcu_head rcu; |
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}; static struct auditd_connection __rcu *auditd_conn; |
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static DEFINE_SPINLOCK(auditd_conn_lock); |
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/* If audit_rate_limit is non-zero, limit the rate of sending audit records |
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* to that number per second. This prevents DoS attacks, but results in * audit records being dropped. */ |
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static u32 audit_rate_limit; |
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/* Number of outstanding audit_buffers allowed. * When set to zero, this means unlimited. */ |
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static u32 audit_backlog_limit = 64; |
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#define AUDIT_BACKLOG_WAIT_TIME (60 * HZ) |
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static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME; |
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/* The identity of the user shutting down the audit system. */ |
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static kuid_t audit_sig_uid = INVALID_UID; static pid_t audit_sig_pid = -1; |
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static u32 audit_sig_sid; |
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|
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/* Records can be lost in several ways: 0) [suppressed in audit_alloc] 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] 2) out of memory in audit_log_move [alloc_skb] 3) suppressed due to audit_rate_limit 4) suppressed due to audit_backlog_limit */ |
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static atomic_t audit_lost = ATOMIC_INIT(0); |
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|
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/* Monotonically increasing sum of time the kernel has spent * waiting while the backlog limit is exceeded. */ static atomic_t audit_backlog_wait_time_actual = ATOMIC_INIT(0); |
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/* Hash for inode-based rules */ struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; |
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static struct kmem_cache *audit_buffer_cache; |
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|
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/* queue msgs to send via kauditd_task */ |
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static struct sk_buff_head audit_queue; |
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/* queue msgs due to temporary unicast send problems */ static struct sk_buff_head audit_retry_queue; /* queue msgs waiting for new auditd connection */ |
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static struct sk_buff_head audit_hold_queue; |
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/* queue servicing thread */ |
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static struct task_struct *kauditd_task; static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); |
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/* waitqueue for callers who are blocked on the audit backlog */ |
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static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
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static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION, .mask = -1, .features = 0, .lock = 0,}; |
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static char *audit_feature_names[2] = { |
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"only_unset_loginuid", |
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"loginuid_immutable", |
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}; |
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/** * struct audit_ctl_mutex - serialize requests from userspace * @lock: the mutex used for locking * @owner: the task which owns the lock * * Description: * This is the lock struct used to ensure we only process userspace requests * in an orderly fashion. We can't simply use a mutex/lock here because we * need to track lock ownership so we don't end up blocking the lock owner in * audit_log_start() or similar. */ static struct audit_ctl_mutex { struct mutex lock; void *owner; } audit_cmd_mutex; |
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/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting * audit records. Since printk uses a 1024 byte buffer, this buffer * should be at least that large. */ #define AUDIT_BUFSIZ 1024 |
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/* The audit_buffer is used when formatting an audit record. The caller * locks briefly to get the record off the freelist or to allocate the * buffer, and locks briefly to send the buffer to the netlink layer or * to place it on a transmit queue. Multiple audit_buffers can be in * use simultaneously. */ struct audit_buffer { |
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struct sk_buff *skb; /* formatted skb ready to send */ |
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struct audit_context *ctx; /* NULL or associated context */ |
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gfp_t gfp_mask; |
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}; |
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struct audit_reply { |
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__u32 portid; |
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struct net *net; |
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struct sk_buff *skb; }; |
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/** * auditd_test_task - Check to see if a given task is an audit daemon * @task: the task to check * * Description: * Return 1 if the task is a registered audit daemon, 0 otherwise. */ |
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int auditd_test_task(struct task_struct *task) |
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{ int rc; |
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struct auditd_connection *ac; |
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rcu_read_lock(); |
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ac = rcu_dereference(auditd_conn); rc = (ac && ac->pid == task_tgid(task) ? 1 : 0); |
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rcu_read_unlock(); return rc; } /** |
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* audit_ctl_lock - Take the audit control lock */ void audit_ctl_lock(void) { mutex_lock(&audit_cmd_mutex.lock); audit_cmd_mutex.owner = current; } /** * audit_ctl_unlock - Drop the audit control lock */ void audit_ctl_unlock(void) { audit_cmd_mutex.owner = NULL; mutex_unlock(&audit_cmd_mutex.lock); } /** * audit_ctl_owner_current - Test to see if the current task owns the lock * * Description: * Return true if the current task owns the audit control lock, false if it * doesn't own the lock. */ static bool audit_ctl_owner_current(void) { return (current == audit_cmd_mutex.owner); } /** |
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* auditd_pid_vnr - Return the auditd PID relative to the namespace |
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* * Description: |
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* Returns the PID in relation to the namespace, 0 on failure. |
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*/ |
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static pid_t auditd_pid_vnr(void) |
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{ pid_t pid; |
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const struct auditd_connection *ac; |
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rcu_read_lock(); |
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ac = rcu_dereference(auditd_conn); if (!ac || !ac->pid) |
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pid = 0; else |
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pid = pid_vnr(ac->pid); |
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rcu_read_unlock(); return pid; } /** |
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* audit_get_sk - Return the audit socket for the given network namespace * @net: the destination network namespace * * Description: * Returns the sock pointer if valid, NULL otherwise. The caller must ensure * that a reference is held for the network namespace while the sock is in use. */ static struct sock *audit_get_sk(const struct net *net) { struct audit_net *aunet; if (!net) return NULL; aunet = net_generic(net, audit_net_id); return aunet->sk; } |
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void audit_panic(const char *message) |
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{ |
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switch (audit_failure) { |
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case AUDIT_FAIL_SILENT: break; case AUDIT_FAIL_PRINTK: |
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if (printk_ratelimit()) |
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pr_err("%s ", message); |
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break; case AUDIT_FAIL_PANIC: |
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panic("audit: %s ", message); |
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break; } } static inline int audit_rate_check(void) { static unsigned long last_check = 0; static int messages = 0; static DEFINE_SPINLOCK(lock); unsigned long flags; unsigned long now; unsigned long elapsed; int retval = 0; if (!audit_rate_limit) return 1; spin_lock_irqsave(&lock, flags); if (++messages < audit_rate_limit) { retval = 1; } else { now = jiffies; elapsed = now - last_check; if (elapsed > HZ) { last_check = now; messages = 0; retval = 1; } } spin_unlock_irqrestore(&lock, flags); return retval; } |
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/** * audit_log_lost - conditionally log lost audit message event * @message: the message stating reason for lost audit message * * Emit at least 1 message per second, even if audit_rate_check is * throttling. * Always increment the lost messages counter. */ |
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void audit_log_lost(const char *message) { static unsigned long last_msg = 0; static DEFINE_SPINLOCK(lock); unsigned long flags; unsigned long now; int print; atomic_inc(&audit_lost); print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); if (!print) { spin_lock_irqsave(&lock, flags); now = jiffies; if (now - last_msg > HZ) { print = 1; last_msg = now; } spin_unlock_irqrestore(&lock, flags); } if (print) { |
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if (printk_ratelimit()) |
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pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u ", |
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atomic_read(&audit_lost), audit_rate_limit, audit_backlog_limit); |
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audit_panic(message); } |
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} |
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static int audit_log_config_change(char *function_name, u32 new, u32 old, |
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int allow_changes) |
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{ |
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struct audit_buffer *ab; int rc = 0; |
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ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
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if (unlikely(!ab)) return rc; |
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audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old); |
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audit_log_session_info(ab); |
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rc = audit_log_task_context(ab); if (rc) allow_changes = 0; /* Something weird, deny request */ |
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audit_log_format(ab, " res=%d", allow_changes); audit_log_end(ab); |
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return rc; |
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} |
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static int audit_do_config_change(char *function_name, u32 *to_change, u32 new) |
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{ |
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int allow_changes, rc = 0; u32 old = *to_change; |
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/* check if we are locked */ |
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if (audit_enabled == AUDIT_LOCKED) allow_changes = 0; |
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else |
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allow_changes = 1; |
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|
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if (audit_enabled != AUDIT_OFF) { |
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rc = audit_log_config_change(function_name, new, old, allow_changes); |
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if (rc) allow_changes = 0; |
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} |
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/* If we are allowed, make the change */ |
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if (allow_changes == 1) *to_change = new; |
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/* Not allowed, update reason */ else if (rc == 0) rc = -EPERM; return rc; |
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} |
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static int audit_set_rate_limit(u32 limit) |
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{ |
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return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit); |
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} |
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static int audit_set_backlog_limit(u32 limit) |
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{ |
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return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit); |
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} |
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static int audit_set_backlog_wait_time(u32 timeout) |
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{ return audit_do_config_change("audit_backlog_wait_time", |
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&audit_backlog_wait_time, timeout); |
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} |
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static int audit_set_enabled(u32 state) |
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{ |
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int rc; |
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if (state > AUDIT_LOCKED) |
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return -EINVAL; |
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rc = audit_do_config_change("audit_enabled", &audit_enabled, state); |
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if (!rc) audit_ever_enabled |= !!state; return rc; |
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} |
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static int audit_set_failure(u32 state) |
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{ |
1da177e4c Linux-2.6.12-rc2 |
447 448 449 450 |
if (state != AUDIT_FAIL_SILENT && state != AUDIT_FAIL_PRINTK && state != AUDIT_FAIL_PANIC) return -EINVAL; |
ce29b682e [PATCH] More user... |
451 |
|
dc9eb698f audit: stop pushi... |
452 |
return audit_do_config_change("audit_failure", &audit_failure, state); |
1da177e4c Linux-2.6.12-rc2 |
453 |
} |
5b52330bb audit: fix auditd... |
454 |
/** |
48d0e023a audit: fix the RC... |
455 456 457 458 459 460 461 |
* auditd_conn_free - RCU helper to release an auditd connection struct * @rcu: RCU head * * Description: * Drop any references inside the auditd connection tracking struct and free * the memory. */ |
447a5647c treewide: Align f... |
462 463 |
static void auditd_conn_free(struct rcu_head *rcu) { |
48d0e023a audit: fix the RC... |
464 465 466 467 468 469 |
struct auditd_connection *ac; ac = container_of(rcu, struct auditd_connection, rcu); put_pid(ac->pid); put_net(ac->net); kfree(ac); |
447a5647c treewide: Align f... |
470 |
} |
48d0e023a audit: fix the RC... |
471 472 |
/** |
5b52330bb audit: fix auditd... |
473 474 475 476 477 478 479 |
* auditd_set - Set/Reset the auditd connection state * @pid: auditd PID * @portid: auditd netlink portid * @net: auditd network namespace pointer * * Description: * This function will obtain and drop network namespace references as |
48d0e023a audit: fix the RC... |
480 |
* necessary. Returns zero on success, negative values on failure. |
5b52330bb audit: fix auditd... |
481 |
*/ |
48d0e023a audit: fix the RC... |
482 |
static int auditd_set(struct pid *pid, u32 portid, struct net *net) |
5b52330bb audit: fix auditd... |
483 484 |
{ unsigned long flags; |
48d0e023a audit: fix the RC... |
485 |
struct auditd_connection *ac_old, *ac_new; |
5b52330bb audit: fix auditd... |
486 |
|
48d0e023a audit: fix the RC... |
487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 |
if (!pid || !net) return -EINVAL; ac_new = kzalloc(sizeof(*ac_new), GFP_KERNEL); if (!ac_new) return -ENOMEM; ac_new->pid = get_pid(pid); ac_new->portid = portid; ac_new->net = get_net(net); spin_lock_irqsave(&auditd_conn_lock, flags); ac_old = rcu_dereference_protected(auditd_conn, lockdep_is_held(&auditd_conn_lock)); rcu_assign_pointer(auditd_conn, ac_new); spin_unlock_irqrestore(&auditd_conn_lock, flags); if (ac_old) call_rcu(&ac_old->rcu, auditd_conn_free); return 0; |
5b52330bb audit: fix auditd... |
507 508 509 |
} /** |
5b52330bb audit: fix auditd... |
510 511 512 513 514 |
* kauditd_print_skb - Print the audit record to the ring buffer * @skb: audit record * * Whatever the reason, this packet may not make it to the auditd connection * so write it via printk so the information isn't completely lost. |
038cbcf65 Audit: unify the ... |
515 |
*/ |
af8b824f2 audit: rename the... |
516 |
static void kauditd_printk_skb(struct sk_buff *skb) |
038cbcf65 Audit: unify the ... |
517 518 |
{ struct nlmsghdr *nlh = nlmsg_hdr(skb); |
c64e66c67 audit: netlink: M... |
519 |
char *data = nlmsg_data(nlh); |
038cbcf65 Audit: unify the ... |
520 |
|
5b52330bb audit: fix auditd... |
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 |
if (nlh->nlmsg_type != AUDIT_EOE && printk_ratelimit()) pr_notice("type=%d %s ", nlh->nlmsg_type, data); } /** * kauditd_rehold_skb - Handle a audit record send failure in the hold queue * @skb: audit record * * Description: * This should only be used by the kauditd_thread when it fails to flush the * hold queue. */ static void kauditd_rehold_skb(struct sk_buff *skb) { /* put the record back in the queue at the same place */ skb_queue_head(&audit_hold_queue, skb); |
c6480207f audit: rework the... |
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 |
} /** * kauditd_hold_skb - Queue an audit record, waiting for auditd * @skb: audit record * * Description: * Queue the audit record, waiting for an instance of auditd. When this * function is called we haven't given up yet on sending the record, but things * are not looking good. The first thing we want to do is try to write the * record via printk and then see if we want to try and hold on to the record * and queue it, if we have room. If we want to hold on to the record, but we * don't have room, record a record lost message. */ static void kauditd_hold_skb(struct sk_buff *skb) { /* at this point it is uncertain if we will ever send this to auditd so * try to send the message via printk before we go any further */ kauditd_printk_skb(skb); /* can we just silently drop the message? */ if (!audit_default) { kfree_skb(skb); return; } /* if we have room, queue the message */ if (!audit_backlog_limit || skb_queue_len(&audit_hold_queue) < audit_backlog_limit) { skb_queue_tail(&audit_hold_queue, skb); return; } |
038cbcf65 Audit: unify the ... |
570 |
|
c6480207f audit: rework the... |
571 572 573 |
/* we have no other options - drop the message */ audit_log_lost("kauditd hold queue overflow"); kfree_skb(skb); |
038cbcf65 Audit: unify the ... |
574 |
} |
c6480207f audit: rework the... |
575 576 577 578 579 580 581 582 583 584 |
/** * kauditd_retry_skb - Queue an audit record, attempt to send again to auditd * @skb: audit record * * Description: * Not as serious as kauditd_hold_skb() as we still have a connected auditd, * but for some reason we are having problems sending it audit records so * queue the given record and attempt to resend. */ static void kauditd_retry_skb(struct sk_buff *skb) |
f3d357b09 Audit: save audit... |
585 |
{ |
c6480207f audit: rework the... |
586 587 588 589 590 |
/* NOTE: because records should only live in the retry queue for a * short period of time, before either being sent or moved to the hold * queue, we don't currently enforce a limit on this queue */ skb_queue_tail(&audit_retry_queue, skb); } |
32a1dbaec audit: try harder... |
591 |
|
c6480207f audit: rework the... |
592 |
/** |
264d50963 audit: make sure ... |
593 |
* auditd_reset - Disconnect the auditd connection |
c81be52a3 audit: fix a race... |
594 |
* @ac: auditd connection state |
264d50963 audit: make sure ... |
595 596 597 |
* * Description: * Break the auditd/kauditd connection and move all the queued records into the |
c81be52a3 audit: fix a race... |
598 599 600 601 |
* hold queue in case auditd reconnects. It is important to note that the @ac * pointer should never be dereferenced inside this function as it may be NULL * or invalid, you can only compare the memory address! If @ac is NULL then * the connection will always be reset. |
264d50963 audit: make sure ... |
602 |
*/ |
c81be52a3 audit: fix a race... |
603 |
static void auditd_reset(const struct auditd_connection *ac) |
264d50963 audit: make sure ... |
604 |
{ |
48d0e023a audit: fix the RC... |
605 |
unsigned long flags; |
264d50963 audit: make sure ... |
606 |
struct sk_buff *skb; |
48d0e023a audit: fix the RC... |
607 |
struct auditd_connection *ac_old; |
264d50963 audit: make sure ... |
608 609 |
/* if it isn't already broken, break the connection */ |
48d0e023a audit: fix the RC... |
610 611 612 |
spin_lock_irqsave(&auditd_conn_lock, flags); ac_old = rcu_dereference_protected(auditd_conn, lockdep_is_held(&auditd_conn_lock)); |
c81be52a3 audit: fix a race... |
613 614 615 616 617 |
if (ac && ac != ac_old) { /* someone already registered a new auditd connection */ spin_unlock_irqrestore(&auditd_conn_lock, flags); return; } |
48d0e023a audit: fix the RC... |
618 619 620 621 622 |
rcu_assign_pointer(auditd_conn, NULL); spin_unlock_irqrestore(&auditd_conn_lock, flags); if (ac_old) call_rcu(&ac_old->rcu, auditd_conn_free); |
264d50963 audit: make sure ... |
623 |
|
cd33f5f2c audit: make sure ... |
624 625 |
/* flush the retry queue to the hold queue, but don't touch the main * queue since we need to process that normally for multicast */ |
264d50963 audit: make sure ... |
626 627 |
while ((skb = skb_dequeue(&audit_retry_queue))) kauditd_hold_skb(skb); |
264d50963 audit: make sure ... |
628 629 630 |
} /** |
5b52330bb audit: fix auditd... |
631 632 |
* auditd_send_unicast_skb - Send a record via unicast to auditd * @skb: audit record |
c6480207f audit: rework the... |
633 634 |
* * Description: |
5b52330bb audit: fix auditd... |
635 636 637 638 639 |
* Send a skb to the audit daemon, returns positive/zero values on success and * negative values on failure; in all cases the skb will be consumed by this * function. If the send results in -ECONNREFUSED the connection with auditd * will be reset. This function may sleep so callers should not hold any locks * where this would cause a problem. |
c6480207f audit: rework the... |
640 |
*/ |
5b52330bb audit: fix auditd... |
641 |
static int auditd_send_unicast_skb(struct sk_buff *skb) |
c6480207f audit: rework the... |
642 |
{ |
5b52330bb audit: fix auditd... |
643 644 645 646 |
int rc; u32 portid; struct net *net; struct sock *sk; |
48d0e023a audit: fix the RC... |
647 |
struct auditd_connection *ac; |
5b52330bb audit: fix auditd... |
648 649 650 651 652 653 654 655 656 |
/* NOTE: we can't call netlink_unicast while in the RCU section so * take a reference to the network namespace and grab local * copies of the namespace, the sock, and the portid; the * namespace and sock aren't going to go away while we hold a * reference and if the portid does become invalid after the RCU * section netlink_unicast() should safely return an error */ rcu_read_lock(); |
48d0e023a audit: fix the RC... |
657 658 |
ac = rcu_dereference(auditd_conn); if (!ac) { |
5b52330bb audit: fix auditd... |
659 |
rcu_read_unlock(); |
b0659ae5e audit: fix memlea... |
660 |
kfree_skb(skb); |
5b52330bb audit: fix auditd... |
661 662 |
rc = -ECONNREFUSED; goto err; |
533c7b69c audit: use proper... |
663 |
} |
48d0e023a audit: fix the RC... |
664 |
net = get_net(ac->net); |
5b52330bb audit: fix auditd... |
665 |
sk = audit_get_sk(net); |
48d0e023a audit: fix the RC... |
666 |
portid = ac->portid; |
5b52330bb audit: fix auditd... |
667 |
rcu_read_unlock(); |
c6480207f audit: rework the... |
668 |
|
5b52330bb audit: fix auditd... |
669 670 671 672 673 674 675 676 |
rc = netlink_unicast(sk, skb, portid, 0); put_net(net); if (rc < 0) goto err; return rc; err: |
c81be52a3 audit: fix a race... |
677 678 |
if (ac && rc == -ECONNREFUSED) auditd_reset(ac); |
5b52330bb audit: fix auditd... |
679 |
return rc; |
c6480207f audit: rework the... |
680 681 682 |
} /** |
5b52330bb audit: fix auditd... |
683 684 685 686 687 688 689 690 691 692 693 694 695 |
* kauditd_send_queue - Helper for kauditd_thread to flush skb queues * @sk: the sending sock * @portid: the netlink destination * @queue: the skb queue to process * @retry_limit: limit on number of netlink unicast failures * @skb_hook: per-skb hook for additional processing * @err_hook: hook called if the skb fails the netlink unicast send * * Description: * Run through the given queue and attempt to send the audit records to auditd, * returns zero on success, negative values on failure. It is up to the caller * to ensure that the @sk is valid for the duration of this function. * |
c6480207f audit: rework the... |
696 |
*/ |
5b52330bb audit: fix auditd... |
697 698 699 700 701 |
static int kauditd_send_queue(struct sock *sk, u32 portid, struct sk_buff_head *queue, unsigned int retry_limit, void (*skb_hook)(struct sk_buff *skb), void (*err_hook)(struct sk_buff *skb)) |
c6480207f audit: rework the... |
702 |
{ |
5b52330bb audit: fix auditd... |
703 704 705 |
int rc = 0; struct sk_buff *skb; static unsigned int failed = 0; |
32a1dbaec audit: try harder... |
706 |
|
5b52330bb audit: fix auditd... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 |
/* NOTE: kauditd_thread takes care of all our locking, we just use * the netlink info passed to us (e.g. sk and portid) */ while ((skb = skb_dequeue(queue))) { /* call the skb_hook for each skb we touch */ if (skb_hook) (*skb_hook)(skb); /* can we send to anyone via unicast? */ if (!sk) { if (err_hook) (*err_hook)(skb); continue; } |
6c54e7899 audit: handle a c... |
721 |
|
5b52330bb audit: fix auditd... |
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 |
/* grab an extra skb reference in case of error */ skb_get(skb); rc = netlink_unicast(sk, skb, portid, 0); if (rc < 0) { /* fatal failure for our queue flush attempt? */ if (++failed >= retry_limit || rc == -ECONNREFUSED || rc == -EPERM) { /* yes - error processing for the queue */ sk = NULL; if (err_hook) (*err_hook)(skb); if (!skb_hook) goto out; /* keep processing with the skb_hook */ continue; } else /* no - requeue to preserve ordering */ skb_queue_head(queue, skb); } else { /* it worked - drop the extra reference and continue */ consume_skb(skb); failed = 0; } |
c6480207f audit: rework the... |
745 |
} |
5b52330bb audit: fix auditd... |
746 747 |
out: return (rc >= 0 ? 0 : rc); |
f3d357b09 Audit: save audit... |
748 |
} |
b551d1d98 audit: refactor h... |
749 |
/* |
c6480207f audit: rework the... |
750 751 |
* kauditd_send_multicast_skb - Send a record to any multicast listeners * @skb: audit record |
451f92163 audit: add netlin... |
752 |
* |
c6480207f audit: rework the... |
753 |
* Description: |
5b52330bb audit: fix auditd... |
754 755 756 |
* Write a multicast message to anyone listening in the initial network * namespace. This function doesn't consume an skb as might be expected since * it has to copy it anyways. |
451f92163 audit: add netlin... |
757 |
*/ |
c6480207f audit: rework the... |
758 |
static void kauditd_send_multicast_skb(struct sk_buff *skb) |
451f92163 audit: add netlin... |
759 |
{ |
c6480207f audit: rework the... |
760 |
struct sk_buff *copy; |
5b52330bb audit: fix auditd... |
761 |
struct sock *sock = audit_get_sk(&init_net); |
c6480207f audit: rework the... |
762 |
struct nlmsghdr *nlh; |
451f92163 audit: add netlin... |
763 |
|
5b52330bb audit: fix auditd... |
764 765 |
/* NOTE: we are not taking an additional reference for init_net since * we don't have to worry about it going away */ |
7f74ecd78 audit: send multi... |
766 767 |
if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG)) return; |
451f92163 audit: add netlin... |
768 769 770 771 772 773 774 775 776 777 |
/* * The seemingly wasteful skb_copy() rather than bumping the refcount * using skb_get() is necessary because non-standard mods are made to * the skb by the original kaudit unicast socket send routine. The * existing auditd daemon assumes this breakage. Fixing this would * require co-ordinating a change in the established protocol between * the kaudit kernel subsystem and the auditd userspace code. There is * no reason for new multicast clients to continue with this * non-compliance. */ |
c6480207f audit: rework the... |
778 |
copy = skb_copy(skb, GFP_KERNEL); |
451f92163 audit: add netlin... |
779 780 |
if (!copy) return; |
c6480207f audit: rework the... |
781 782 |
nlh = nlmsg_hdr(copy); nlh->nlmsg_len = skb->len; |
451f92163 audit: add netlin... |
783 |
|
c6480207f audit: rework the... |
784 |
nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, GFP_KERNEL); |
451f92163 audit: add netlin... |
785 |
} |
c6480207f audit: rework the... |
786 |
/** |
5b52330bb audit: fix auditd... |
787 788 |
* kauditd_thread - Worker thread to send audit records to userspace * @dummy: unused |
b551d1d98 audit: refactor h... |
789 |
*/ |
97a41e261 [PATCH] kernel/: ... |
790 |
static int kauditd_thread(void *dummy) |
b7d112581 AUDIT: Send netli... |
791 |
{ |
c6480207f audit: rework the... |
792 |
int rc; |
5b52330bb audit: fix auditd... |
793 794 795 |
u32 portid = 0; struct net *net = NULL; struct sock *sk = NULL; |
48d0e023a audit: fix the RC... |
796 |
struct auditd_connection *ac; |
4aa83872d audit: queue netl... |
797 |
|
c6480207f audit: rework the... |
798 |
#define UNICAST_RETRIES 5 |
c6480207f audit: rework the... |
799 |
|
831441862 Freezer: make ker... |
800 |
set_freezable(); |
4899b8b16 [PATCH] kauditd_t... |
801 |
while (!kthread_should_stop()) { |
5b52330bb audit: fix auditd... |
802 803 |
/* NOTE: see the lock comments in auditd_send_unicast_skb() */ rcu_read_lock(); |
48d0e023a audit: fix the RC... |
804 805 |
ac = rcu_dereference(auditd_conn); if (!ac) { |
5b52330bb audit: fix auditd... |
806 807 808 |
rcu_read_unlock(); goto main_queue; } |
48d0e023a audit: fix the RC... |
809 |
net = get_net(ac->net); |
5b52330bb audit: fix auditd... |
810 |
sk = audit_get_sk(net); |
48d0e023a audit: fix the RC... |
811 |
portid = ac->portid; |
5b52330bb audit: fix auditd... |
812 |
rcu_read_unlock(); |
c6480207f audit: rework the... |
813 814 |
/* attempt to flush the hold queue */ |
5b52330bb audit: fix auditd... |
815 816 817 |
rc = kauditd_send_queue(sk, portid, &audit_hold_queue, UNICAST_RETRIES, NULL, kauditd_rehold_skb); |
c34c78dfc audit: remove red... |
818 |
if (rc < 0) { |
5b52330bb audit: fix auditd... |
819 |
sk = NULL; |
c81be52a3 audit: fix a race... |
820 |
auditd_reset(ac); |
5b52330bb audit: fix auditd... |
821 |
goto main_queue; |
c6480207f audit: rework the... |
822 |
} |
f3d357b09 Audit: save audit... |
823 |
|
c6480207f audit: rework the... |
824 |
/* attempt to flush the retry queue */ |
5b52330bb audit: fix auditd... |
825 826 827 |
rc = kauditd_send_queue(sk, portid, &audit_retry_queue, UNICAST_RETRIES, NULL, kauditd_hold_skb); |
c34c78dfc audit: remove red... |
828 |
if (rc < 0) { |
5b52330bb audit: fix auditd... |
829 |
sk = NULL; |
c81be52a3 audit: fix a race... |
830 |
auditd_reset(ac); |
5b52330bb audit: fix auditd... |
831 |
goto main_queue; |
c6480207f audit: rework the... |
832 |
} |
db8973194 audit: efficiency... |
833 |
|
5b52330bb audit: fix auditd... |
834 835 836 837 |
main_queue: /* process the main queue - do the multicast send and attempt * unicast, dump failed record sends to the retry queue; if * sk == NULL due to previous failures we will just do the |
c81be52a3 audit: fix a race... |
838 |
* multicast send and move the record to the hold queue */ |
264d50963 audit: make sure ... |
839 840 |
rc = kauditd_send_queue(sk, portid, &audit_queue, 1, kauditd_send_multicast_skb, |
c81be52a3 audit: fix a race... |
841 842 843 844 |
(sk ? kauditd_retry_skb : kauditd_hold_skb)); if (ac && rc < 0) auditd_reset(ac); |
264d50963 audit: make sure ... |
845 |
sk = NULL; |
5b52330bb audit: fix auditd... |
846 847 848 849 850 |
/* drop our netns reference, no auditd sends past this line */ if (net) { put_net(net); net = NULL; |
3320c5133 audit: flatten ka... |
851 |
} |
5b52330bb audit: fix auditd... |
852 853 854 855 856 857 858 859 860 861 |
/* we have processed all the queues so wake everyone */ wake_up(&audit_backlog_wait); /* NOTE: we want to wake up if there is anything on the queue, * regardless of if an auditd is connected, as we need to * do the multicast send and rotate records from the * main queue to the retry/hold queues */ wait_event_freezable(kauditd_wait, (skb_queue_len(&audit_queue) ? 1 : 0)); |
b7d112581 AUDIT: Send netli... |
862 |
} |
c6480207f audit: rework the... |
863 |
|
4899b8b16 [PATCH] kauditd_t... |
864 |
return 0; |
b7d112581 AUDIT: Send netli... |
865 |
} |
3054d0671 audit: fix a net ... |
866 |
int audit_send_list_thread(void *_dest) |
9044e6bca [PATCH] fix deadl... |
867 868 |
{ struct audit_netlink_list *dest = _dest; |
9044e6bca [PATCH] fix deadl... |
869 |
struct sk_buff *skb; |
5b52330bb audit: fix auditd... |
870 |
struct sock *sk = audit_get_sk(dest->net); |
9044e6bca [PATCH] fix deadl... |
871 872 |
/* wait for parent to finish and send an ACK */ |
ce423631c audit: track the ... |
873 874 |
audit_ctl_lock(); audit_ctl_unlock(); |
9044e6bca [PATCH] fix deadl... |
875 876 |
while ((skb = __skb_dequeue(&dest->q)) != NULL) |
5b52330bb audit: fix auditd... |
877 |
netlink_unicast(sk, skb, dest->portid, 0); |
9044e6bca [PATCH] fix deadl... |
878 |
|
5b52330bb audit: fix auditd... |
879 |
put_net(dest->net); |
9044e6bca [PATCH] fix deadl... |
880 881 882 883 |
kfree(dest); return 0; } |
45a0642b4 audit: kernel gen... |
884 |
struct sk_buff *audit_make_reply(int seq, int type, int done, |
b8800aa5d audit: make funct... |
885 |
int multi, const void *payload, int size) |
9044e6bca [PATCH] fix deadl... |
886 887 888 |
{ struct sk_buff *skb; struct nlmsghdr *nlh; |
9044e6bca [PATCH] fix deadl... |
889 890 891 |
void *data; int flags = multi ? NLM_F_MULTI : 0; int t = done ? NLMSG_DONE : type; |
ee080e6ce Audit: cleanup ne... |
892 |
skb = nlmsg_new(size, GFP_KERNEL); |
9044e6bca [PATCH] fix deadl... |
893 894 |
if (!skb) return NULL; |
45a0642b4 audit: kernel gen... |
895 |
nlh = nlmsg_put(skb, 0, seq, t, size, flags); |
c64e66c67 audit: netlink: M... |
896 897 898 |
if (!nlh) goto out_kfree_skb; data = nlmsg_data(nlh); |
9044e6bca [PATCH] fix deadl... |
899 900 |
memcpy(data, payload, size); return skb; |
c64e66c67 audit: netlink: M... |
901 902 |
out_kfree_skb: kfree_skb(skb); |
9044e6bca [PATCH] fix deadl... |
903 904 |
return NULL; } |
a48b284b4 audit: fix a net ... |
905 906 907 908 |
static void audit_free_reply(struct audit_reply *reply) { if (!reply) return; |
c07203516 audit: Remove red... |
909 |
kfree_skb(reply->skb); |
a48b284b4 audit: fix a net ... |
910 911 912 913 |
if (reply->net) put_net(reply->net); kfree(reply); } |
f09ac9db2 Audit: stop deadl... |
914 915 916 |
static int audit_send_reply_thread(void *arg) { struct audit_reply *reply = (struct audit_reply *)arg; |
ce423631c audit: track the ... |
917 918 |
audit_ctl_lock(); audit_ctl_unlock(); |
f09ac9db2 Audit: stop deadl... |
919 920 921 |
/* Ignore failure. It'll only happen if the sender goes away, because our timeout is set to infinite. */ |
a48b284b4 audit: fix a net ... |
922 923 924 |
netlink_unicast(audit_get_sk(reply->net), reply->skb, reply->portid, 0); reply->skb = NULL; audit_free_reply(reply); |
f09ac9db2 Audit: stop deadl... |
925 926 |
return 0; } |
c6480207f audit: rework the... |
927 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
928 929 |
/** * audit_send_reply - send an audit reply message via netlink |
d211f177b audit: Update kdo... |
930 |
* @request_skb: skb of request we are replying to (used to target the reply) |
b0dd25a82 [PATCH] AUDIT: ke... |
931 932 933 934 935 936 937 |
* @seq: sequence number * @type: audit message type * @done: done (last) flag * @multi: multi-part message flag * @payload: payload data * @size: payload size * |
a48b284b4 audit: fix a net ... |
938 |
* Allocates a skb, builds the netlink message, and sends it to the port id. |
b0dd25a82 [PATCH] AUDIT: ke... |
939 |
*/ |
6f285b19d audit: Send repli... |
940 |
static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done, |
f9441639e audit: fix netlin... |
941 |
int multi, const void *payload, int size) |
1da177e4c Linux-2.6.12-rc2 |
942 |
{ |
f09ac9db2 Audit: stop deadl... |
943 |
struct task_struct *tsk; |
a48b284b4 audit: fix a net ... |
944 |
struct audit_reply *reply; |
f09ac9db2 Audit: stop deadl... |
945 |
|
a48b284b4 audit: fix a net ... |
946 |
reply = kzalloc(sizeof(*reply), GFP_KERNEL); |
f09ac9db2 Audit: stop deadl... |
947 948 |
if (!reply) return; |
a48b284b4 audit: fix a net ... |
949 950 951 952 |
reply->skb = audit_make_reply(seq, type, done, multi, payload, size); if (!reply->skb) goto err; reply->net = get_net(sock_net(NETLINK_CB(request_skb).sk)); |
45a0642b4 audit: kernel gen... |
953 |
reply->portid = NETLINK_CB(request_skb).portid; |
f09ac9db2 Audit: stop deadl... |
954 955 |
tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); |
a48b284b4 audit: fix a net ... |
956 957 958 959 960 961 962 |
if (IS_ERR(tsk)) goto err; return; err: audit_free_reply(reply); |
1da177e4c Linux-2.6.12-rc2 |
963 964 965 966 967 968 |
} /* * Check for appropriate CAP_AUDIT_ capabilities on incoming audit * control messages. */ |
c7bdb545d [NETLINK]: Encaps... |
969 |
static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
1da177e4c Linux-2.6.12-rc2 |
970 971 |
{ int err = 0; |
5a3cb3b6c audit: allow user... |
972 |
/* Only support initial user namespace for now. */ |
aa4af831b AUDIT: Allow logi... |
973 974 975 976 977 978 979 980 981 982 |
/* * We return ECONNREFUSED because it tricks userspace into thinking * that audit was not configured into the kernel. Lots of users * configure their PAM stack (because that's what the distro does) * to reject login if unable to send messages to audit. If we return * ECONNREFUSED the PAM stack thinks the kernel does not have audit * configured in and will let login proceed. If we return EPERM * userspace will reject all logins. This should be removed when we * support non init namespaces!! */ |
0b747172d Merge git://git.i... |
983 |
if (current_user_ns() != &init_user_ns) |
aa4af831b AUDIT: Allow logi... |
984 |
return -ECONNREFUSED; |
34e36d8ec audit: Limit audi... |
985 |
|
1da177e4c Linux-2.6.12-rc2 |
986 |
switch (msg_type) { |
1da177e4c Linux-2.6.12-rc2 |
987 |
case AUDIT_LIST: |
1da177e4c Linux-2.6.12-rc2 |
988 989 |
case AUDIT_ADD: case AUDIT_DEL: |
189009091 audit: remove the... |
990 991 992 |
return -EOPNOTSUPP; case AUDIT_GET: case AUDIT_SET: |
b0fed4021 audit: implement ... |
993 994 |
case AUDIT_GET_FEATURE: case AUDIT_SET_FEATURE: |
189009091 audit: remove the... |
995 996 |
case AUDIT_LIST_RULES: case AUDIT_ADD_RULE: |
93315ed6d [PATCH] audit str... |
997 |
case AUDIT_DEL_RULE: |
c2f0c7c35 The attached patc... |
998 |
case AUDIT_SIGNAL_INFO: |
522ed7767 Audit: add TTY in... |
999 1000 |
case AUDIT_TTY_GET: case AUDIT_TTY_SET: |
74c3cbe33 [PATCH] audit: wa... |
1001 1002 |
case AUDIT_TRIM: case AUDIT_MAKE_EQUIV: |
5a3cb3b6c audit: allow user... |
1003 1004 |
/* Only support auditd and auditctl in initial pid namespace * for now. */ |
5985de675 audit: code clean up |
1005 |
if (task_active_pid_ns(current) != &init_pid_ns) |
5a3cb3b6c audit: allow user... |
1006 |
return -EPERM; |
90f62cf30 net: Use netlink_... |
1007 |
if (!netlink_capable(skb, CAP_AUDIT_CONTROL)) |
1da177e4c Linux-2.6.12-rc2 |
1008 1009 |
err = -EPERM; break; |
05474106a AUDIT: Fix AVC_US... |
1010 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
1011 1012 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
90f62cf30 net: Use netlink_... |
1013 |
if (!netlink_capable(skb, CAP_AUDIT_WRITE)) |
1da177e4c Linux-2.6.12-rc2 |
1014 1015 1016 1017 1018 1019 1020 1021 |
err = -EPERM; break; default: /* bad msg */ err = -EINVAL; } return err; } |
626abcd13 audit: add syscal... |
1022 1023 |
static void audit_log_common_recv_msg(struct audit_context *context, struct audit_buffer **ab, u16 msg_type) |
50397bd1e [AUDIT] clean up ... |
1024 |
{ |
dc9eb698f audit: stop pushi... |
1025 |
uid_t uid = from_kuid(&init_user_ns, current_uid()); |
f1dc4867f audit: anchor all... |
1026 |
pid_t pid = task_tgid_nr(current); |
50397bd1e [AUDIT] clean up ... |
1027 |
|
0868a5e15 audit: printk USE... |
1028 |
if (!audit_enabled && msg_type != AUDIT_USER_AVC) { |
50397bd1e [AUDIT] clean up ... |
1029 |
*ab = NULL; |
233a68667 audit: make audit... |
1030 |
return; |
50397bd1e [AUDIT] clean up ... |
1031 |
} |
626abcd13 audit: add syscal... |
1032 |
*ab = audit_log_start(context, GFP_KERNEL, msg_type); |
0644ec0cc audit: catch poss... |
1033 |
if (unlikely(!*ab)) |
233a68667 audit: make audit... |
1034 |
return; |
a2c97da11 audit: use sessio... |
1035 |
audit_log_format(*ab, "pid=%d uid=%u ", pid, uid); |
4d3fb709b helper for some s... |
1036 |
audit_log_session_info(*ab); |
b122c3767 audit: use a cons... |
1037 |
audit_log_task_context(*ab); |
50397bd1e [AUDIT] clean up ... |
1038 |
} |
626abcd13 audit: add syscal... |
1039 1040 1041 1042 1043 |
static inline void audit_log_user_recv_msg(struct audit_buffer **ab, u16 msg_type) { audit_log_common_recv_msg(NULL, ab, msg_type); } |
b0fed4021 audit: implement ... |
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 |
int is_audit_feature_set(int i) { return af.features & AUDIT_FEATURE_TO_MASK(i); } static int audit_get_feature(struct sk_buff *skb) { u32 seq; seq = nlmsg_hdr(skb)->nlmsg_seq; |
9ef915147 audit: correct AU... |
1055 |
audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af)); |
b0fed4021 audit: implement ... |
1056 1057 1058 1059 1060 1061 1062 1063 |
return 0; } static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, u32 old_lock, u32 new_lock, int res) { struct audit_buffer *ab; |
b6c50fe0b audit: don't gene... |
1064 1065 |
if (audit_enabled == AUDIT_OFF) return; |
2a1fe215e audit: use curren... |
1066 |
|
cdfb6b341 audit: use inline... |
1067 |
ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_FEATURE_CHANGE); |
23138ead2 audit: return on ... |
1068 1069 |
if (!ab) return; |
2a1fe215e audit: use curren... |
1070 |
audit_log_task_info(ab); |
897f1acbb audit: AUDIT_FEAT... |
1071 |
audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d", |
b0fed4021 audit: implement ... |
1072 1073 1074 1075 |
audit_feature_names[which], !!old_feature, !!new_feature, !!old_lock, !!new_lock, res); audit_log_end(ab); } |
756125289 audit: always che... |
1076 |
static int audit_set_feature(struct audit_features *uaf) |
b0fed4021 audit: implement ... |
1077 |
{ |
b0fed4021 audit: implement ... |
1078 |
int i; |
6eed9b261 kernel/audit.c: u... |
1079 |
BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names)); |
b0fed4021 audit: implement ... |
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 |
/* if there is ever a version 2 we should handle that here */ for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { u32 feature = AUDIT_FEATURE_TO_MASK(i); u32 old_feature, new_feature, old_lock, new_lock; /* if we are not changing this feature, move along */ if (!(feature & uaf->mask)) continue; old_feature = af.features & feature; new_feature = uaf->features & feature; new_lock = (uaf->lock | af.lock) & feature; old_lock = af.lock & feature; /* are we changing a locked feature? */ |
4547b3bc4 audit: use old_lo... |
1097 |
if (old_lock && (new_feature != old_feature)) { |
b0fed4021 audit: implement ... |
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 |
audit_log_feature_change(i, old_feature, new_feature, old_lock, new_lock, 0); return -EPERM; } } /* nothing invalid, do the changes */ for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { u32 feature = AUDIT_FEATURE_TO_MASK(i); u32 old_feature, new_feature, old_lock, new_lock; /* if we are not changing this feature, move along */ if (!(feature & uaf->mask)) continue; old_feature = af.features & feature; new_feature = uaf->features & feature; old_lock = af.lock & feature; new_lock = (uaf->lock | af.lock) & feature; if (new_feature != old_feature) audit_log_feature_change(i, old_feature, new_feature, old_lock, new_lock, 1); if (new_feature) af.features |= feature; else af.features &= ~feature; af.lock |= new_lock; } return 0; } |
b6c7c115c audit: store the ... |
1130 |
static int audit_replace(struct pid *pid) |
133e1e5ac audit: stop an ol... |
1131 |
{ |
b6c7c115c audit: store the ... |
1132 |
pid_t pvnr; |
5b52330bb audit: fix auditd... |
1133 |
struct sk_buff *skb; |
133e1e5ac audit: stop an ol... |
1134 |
|
b6c7c115c audit: store the ... |
1135 1136 |
pvnr = pid_vnr(pid); skb = audit_make_reply(0, AUDIT_REPLACE, 0, 0, &pvnr, sizeof(pvnr)); |
133e1e5ac audit: stop an ol... |
1137 1138 |
if (!skb) return -ENOMEM; |
5b52330bb audit: fix auditd... |
1139 |
return auditd_send_unicast_skb(skb); |
133e1e5ac audit: stop an ol... |
1140 |
} |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 |
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { |
dc9eb698f audit: stop pushi... |
1143 |
u32 seq; |
1da177e4c Linux-2.6.12-rc2 |
1144 |
void *data; |
756125289 audit: always che... |
1145 |
int data_len; |
1da177e4c Linux-2.6.12-rc2 |
1146 |
int err; |
c04049939 AUDIT: Add messag... |
1147 |
struct audit_buffer *ab; |
1da177e4c Linux-2.6.12-rc2 |
1148 |
u16 msg_type = nlh->nlmsg_type; |
e1396065e [PATCH] collect s... |
1149 |
struct audit_sig_info *sig_data; |
50397bd1e [AUDIT] clean up ... |
1150 |
char *ctx = NULL; |
e1396065e [PATCH] collect s... |
1151 |
u32 len; |
1da177e4c Linux-2.6.12-rc2 |
1152 |
|
c7bdb545d [NETLINK]: Encaps... |
1153 |
err = audit_netlink_ok(skb, msg_type); |
1da177e4c Linux-2.6.12-rc2 |
1154 1155 |
if (err) return err; |
1da177e4c Linux-2.6.12-rc2 |
1156 |
seq = nlh->nlmsg_seq; |
c64e66c67 audit: netlink: M... |
1157 |
data = nlmsg_data(nlh); |
756125289 audit: always che... |
1158 |
data_len = nlmsg_len(nlh); |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 |
switch (msg_type) { |
09f883a90 audit: clean up A... |
1161 1162 1163 |
case AUDIT_GET: { struct audit_status s; memset(&s, 0, sizeof(s)); |
b43870c74 audit: report aud... |
1164 1165 |
s.enabled = audit_enabled; s.failure = audit_failure; |
b6c7c115c audit: store the ... |
1166 1167 |
/* NOTE: use pid_vnr() so the PID is relative to the current * namespace */ |
b43870c74 audit: report aud... |
1168 1169 1170 1171 1172 1173 1174 1175 |
s.pid = auditd_pid_vnr(); s.rate_limit = audit_rate_limit; s.backlog_limit = audit_backlog_limit; s.lost = atomic_read(&audit_lost); s.backlog = skb_queue_len(&audit_queue); s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL; s.backlog_wait_time = audit_backlog_wait_time; s.backlog_wait_time_actual = atomic_read(&audit_backlog_wait_time_actual); |
6f285b19d audit: Send repli... |
1176 |
audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s)); |
1da177e4c Linux-2.6.12-rc2 |
1177 |
break; |
09f883a90 audit: clean up A... |
1178 1179 1180 1181 1182 |
} case AUDIT_SET: { struct audit_status s; memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ |
756125289 audit: always che... |
1183 |
memcpy(&s, data, min_t(size_t, sizeof(s), data_len)); |
09f883a90 audit: clean up A... |
1184 1185 |
if (s.mask & AUDIT_STATUS_ENABLED) { err = audit_set_enabled(s.enabled); |
20c6aaa39 [PATCH] Fix the b... |
1186 1187 |
if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
1188 |
} |
09f883a90 audit: clean up A... |
1189 1190 |
if (s.mask & AUDIT_STATUS_FAILURE) { err = audit_set_failure(s.failure); |
20c6aaa39 [PATCH] Fix the b... |
1191 1192 |
if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
1193 |
} |
09f883a90 audit: clean up A... |
1194 |
if (s.mask & AUDIT_STATUS_PID) { |
b6c7c115c audit: store the ... |
1195 1196 1197 1198 1199 1200 1201 |
/* NOTE: we are using the vnr PID functions below * because the s.pid value is relative to the * namespace of the caller; at present this * doesn't matter much since you can really only * run auditd from the initial pid namespace, but * something to keep in mind if this changes */ pid_t new_pid = s.pid; |
5b52330bb audit: fix auditd... |
1202 |
pid_t auditd_pid; |
b6c7c115c audit: store the ... |
1203 |
struct pid *req_pid = task_tgid(current); |
33e8a9078 audit: Allow audi... |
1204 1205 1206 |
/* Sanity check - PID values must match. Setting * pid to 0 is how auditd ends auditing. */ if (new_pid && (new_pid != pid_vnr(req_pid))) |
b6c7c115c audit: store the ... |
1207 |
return -EINVAL; |
1a6b9f231 [AUDIT] make audi... |
1208 |
|
5b52330bb audit: fix auditd... |
1209 |
/* test the auditd connection */ |
b6c7c115c audit: store the ... |
1210 |
audit_replace(req_pid); |
5b52330bb audit: fix auditd... |
1211 |
|
48d0e023a audit: fix the RC... |
1212 |
auditd_pid = auditd_pid_vnr(); |
33e8a9078 audit: Allow audi... |
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 |
if (auditd_pid) { /* replacing a healthy auditd is not allowed */ if (new_pid) { audit_log_config_change("audit_pid", new_pid, auditd_pid, 0); return -EEXIST; } /* only current auditd can unregister itself */ if (pid_vnr(req_pid) != auditd_pid) { audit_log_config_change("audit_pid", new_pid, auditd_pid, 0); return -EACCES; } |
935c9e7ff audit: log failed... |
1226 |
} |
5b52330bb audit: fix auditd... |
1227 |
|
533c7b69c audit: use proper... |
1228 |
if (new_pid) { |
5b52330bb audit: fix auditd... |
1229 |
/* register a new auditd connection */ |
48d0e023a audit: fix the RC... |
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 |
err = auditd_set(req_pid, NETLINK_CB(skb).portid, sock_net(NETLINK_CB(skb).sk)); if (audit_enabled != AUDIT_OFF) audit_log_config_change("audit_pid", new_pid, auditd_pid, err ? 0 : 1); if (err) return err; |
5b52330bb audit: fix auditd... |
1240 1241 |
/* try to process any backlog */ wake_up_interruptible(&kauditd_wait); |
48d0e023a audit: fix the RC... |
1242 1243 1244 1245 1246 |
} else { if (audit_enabled != AUDIT_OFF) audit_log_config_change("audit_pid", new_pid, auditd_pid, 1); |
5b52330bb audit: fix auditd... |
1247 |
/* unregister the auditd connection */ |
c81be52a3 audit: fix a race... |
1248 |
auditd_reset(NULL); |
48d0e023a audit: fix the RC... |
1249 |
} |
1da177e4c Linux-2.6.12-rc2 |
1250 |
} |
09f883a90 audit: clean up A... |
1251 1252 |
if (s.mask & AUDIT_STATUS_RATE_LIMIT) { err = audit_set_rate_limit(s.rate_limit); |
20c6aaa39 [PATCH] Fix the b... |
1253 1254 1255 |
if (err < 0) return err; } |
51cc83f02 audit: add audit_... |
1256 |
if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) { |
09f883a90 audit: clean up A... |
1257 |
err = audit_set_backlog_limit(s.backlog_limit); |
51cc83f02 audit: add audit_... |
1258 1259 1260 |
if (err < 0) return err; } |
3f0c5fad8 audit: remove nee... |
1261 1262 1263 |
if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) { if (sizeof(s) > (size_t)nlh->nlmsg_len) return -EINVAL; |
724e7bfcc audit: Remove con... |
1264 |
if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME) |
3f0c5fad8 audit: remove nee... |
1265 1266 1267 1268 |
return -EINVAL; err = audit_set_backlog_wait_time(s.backlog_wait_time); if (err < 0) return err; |
51cc83f02 audit: add audit_... |
1269 |
} |
92c82e8a3 audit: add featur... |
1270 1271 1272 1273 1274 1275 |
if (s.mask == AUDIT_STATUS_LOST) { u32 lost = atomic_xchg(&audit_lost, 0); audit_log_config_change("lost", 0, lost, 1); return lost; } |
b43870c74 audit: report aud... |
1276 1277 1278 1279 1280 1281 |
if (s.mask == AUDIT_STATUS_BACKLOG_WAIT_TIME_ACTUAL) { u32 actual = atomic_xchg(&audit_backlog_wait_time_actual, 0); audit_log_config_change("backlog_wait_time_actual", 0, actual, 1); return actual; } |
1da177e4c Linux-2.6.12-rc2 |
1282 |
break; |
09f883a90 audit: clean up A... |
1283 |
} |
b0fed4021 audit: implement ... |
1284 1285 1286 1287 1288 1289 |
case AUDIT_GET_FEATURE: err = audit_get_feature(skb); if (err) return err; break; case AUDIT_SET_FEATURE: |
756125289 audit: always che... |
1290 1291 1292 |
if (data_len < sizeof(struct audit_features)) return -EINVAL; err = audit_set_feature(data); |
b0fed4021 audit: implement ... |
1293 1294 1295 |
if (err) return err; break; |
05474106a AUDIT: Fix AVC_US... |
1296 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
1297 1298 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
4a4cd633b AUDIT: Optimise t... |
1299 1300 |
if (!audit_enabled && msg_type != AUDIT_USER_AVC) return 0; |
763dafc52 audit: check the ... |
1301 1302 1303 |
/* exit early if there isn't at least one character to print */ if (data_len < 2) return -EINVAL; |
4a4cd633b AUDIT: Optimise t... |
1304 |
|
86b2efbe3 audit: add fields... |
1305 |
err = audit_filter(msg_type, AUDIT_FILTER_USER); |
724e4fcc8 audit: log on err... |
1306 |
if (err == 1) { /* match or error */ |
756125289 audit: always che... |
1307 |
char *str = data; |
4a4cd633b AUDIT: Optimise t... |
1308 |
err = 0; |
522ed7767 Audit: add TTY in... |
1309 |
if (msg_type == AUDIT_USER_TTY) { |
37282a779 tty: audit: Combi... |
1310 |
err = tty_audit_push(); |
522ed7767 Audit: add TTY in... |
1311 1312 1313 |
if (err) break; } |
626abcd13 audit: add syscal... |
1314 |
audit_log_user_recv_msg(&ab, msg_type); |
756125289 audit: always che... |
1315 1316 1317 |
if (msg_type != AUDIT_USER_TTY) { /* ensure NULL termination */ str[data_len - 1] = '\0'; |
b50eba7e2 audit: format use... |
1318 1319 |
audit_log_format(ab, " msg='%.*s'", AUDIT_MESSAGE_TEXT_MAX, |
756125289 audit: always che... |
1320 1321 |
str); } else { |
f7616102d audit: use data= ... |
1322 |
audit_log_format(ab, " data="); |
756125289 audit: always che... |
1323 1324 1325 |
if (data_len > 0 && str[data_len - 1] == '\0') data_len--; audit_log_n_untrustedstring(ab, str, data_len); |
4a4cd633b AUDIT: Optimise t... |
1326 |
} |
50397bd1e [AUDIT] clean up ... |
1327 |
audit_log_end(ab); |
0f45aa18e AUDIT: Allow filt... |
1328 |
} |
1da177e4c Linux-2.6.12-rc2 |
1329 |
break; |
93315ed6d [PATCH] audit str... |
1330 1331 |
case AUDIT_ADD_RULE: case AUDIT_DEL_RULE: |
756125289 audit: always che... |
1332 |
if (data_len < sizeof(struct audit_rule_data)) |
93315ed6d [PATCH] audit str... |
1333 |
return -EINVAL; |
1a6b9f231 [AUDIT] make audi... |
1334 |
if (audit_enabled == AUDIT_LOCKED) { |
626abcd13 audit: add syscal... |
1335 1336 |
audit_log_common_recv_msg(audit_context(), &ab, AUDIT_CONFIG_CHANGE); |
53fc7a01d audit: give a clu... |
1337 1338 1339 1340 |
audit_log_format(ab, " op=%s audit_enabled=%d res=0", msg_type == AUDIT_ADD_RULE ? "add_rule" : "remove_rule", audit_enabled); |
50397bd1e [AUDIT] clean up ... |
1341 |
audit_log_end(ab); |
6a01b07fa [PATCH] audit con... |
1342 1343 |
return -EPERM; } |
756125289 audit: always che... |
1344 |
err = audit_rule_change(msg_type, seq, data, data_len); |
1da177e4c Linux-2.6.12-rc2 |
1345 |
break; |
ce0d9f046 audit: refactor a... |
1346 |
case AUDIT_LIST_RULES: |
6f285b19d audit: Send repli... |
1347 |
err = audit_list_rules_send(skb, seq); |
ce0d9f046 audit: refactor a... |
1348 |
break; |
74c3cbe33 [PATCH] audit: wa... |
1349 1350 |
case AUDIT_TRIM: audit_trim_trees(); |
626abcd13 audit: add syscal... |
1351 1352 |
audit_log_common_recv_msg(audit_context(), &ab, AUDIT_CONFIG_CHANGE); |
74c3cbe33 [PATCH] audit: wa... |
1353 1354 1355 1356 1357 1358 |
audit_log_format(ab, " op=trim res=1"); audit_log_end(ab); break; case AUDIT_MAKE_EQUIV: { void *bufp = data; u32 sizes[2]; |
756125289 audit: always che... |
1359 |
size_t msglen = data_len; |
74c3cbe33 [PATCH] audit: wa... |
1360 1361 1362 |
char *old, *new; err = -EINVAL; |
7719e437f [PATCH 2/2] audit... |
1363 |
if (msglen < 2 * sizeof(u32)) |
74c3cbe33 [PATCH] audit: wa... |
1364 1365 1366 |
break; memcpy(sizes, bufp, 2 * sizeof(u32)); bufp += 2 * sizeof(u32); |
7719e437f [PATCH 2/2] audit... |
1367 1368 |
msglen -= 2 * sizeof(u32); old = audit_unpack_string(&bufp, &msglen, sizes[0]); |
74c3cbe33 [PATCH] audit: wa... |
1369 1370 1371 1372 |
if (IS_ERR(old)) { err = PTR_ERR(old); break; } |
7719e437f [PATCH 2/2] audit... |
1373 |
new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
74c3cbe33 [PATCH] audit: wa... |
1374 1375 1376 1377 1378 1379 1380 |
if (IS_ERR(new)) { err = PTR_ERR(new); kfree(old); break; } /* OK, here comes... */ err = audit_tag_tree(old, new); |
626abcd13 audit: add syscal... |
1381 1382 |
audit_log_common_recv_msg(audit_context(), &ab, AUDIT_CONFIG_CHANGE); |
74c3cbe33 [PATCH] audit: wa... |
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 |
audit_log_format(ab, " op=make_equiv old="); audit_log_untrustedstring(ab, old); audit_log_format(ab, " new="); audit_log_untrustedstring(ab, new); audit_log_format(ab, " res=%d", !err); audit_log_end(ab); kfree(old); kfree(new); break; } |
c2f0c7c35 The attached patc... |
1393 |
case AUDIT_SIGNAL_INFO: |
939cbf260 Audit: send signa... |
1394 1395 1396 1397 1398 1399 |
len = 0; if (audit_sig_sid) { err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); if (err) return err; } |
e1396065e [PATCH] collect s... |
1400 1401 |
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { |
939cbf260 Audit: send signa... |
1402 1403 |
if (audit_sig_sid) security_release_secctx(ctx, len); |
e1396065e [PATCH] collect s... |
1404 1405 |
return -ENOMEM; } |
cca080d9b userns: Convert a... |
1406 |
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
e1396065e [PATCH] collect s... |
1407 |
sig_data->pid = audit_sig_pid; |
939cbf260 Audit: send signa... |
1408 1409 1410 1411 |
if (audit_sig_sid) { memcpy(sig_data->ctx, ctx, len); security_release_secctx(ctx, len); } |
6f285b19d audit: Send repli... |
1412 1413 |
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, sig_data, sizeof(*sig_data) + len); |
e1396065e [PATCH] collect s... |
1414 |
kfree(sig_data); |
c2f0c7c35 The attached patc... |
1415 |
break; |
522ed7767 Audit: add TTY in... |
1416 1417 |
case AUDIT_TTY_GET: { struct audit_tty_status s; |
2e28d38ae tty: audit: Handl... |
1418 |
unsigned int t; |
8aa14b649 audit: Simply AUD... |
1419 |
|
2e28d38ae tty: audit: Handl... |
1420 1421 1422 |
t = READ_ONCE(current->signal->audit_tty); s.enabled = t & AUDIT_TTY_ENABLE; s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); |
8aa14b649 audit: Simply AUD... |
1423 |
|
6f285b19d audit: Send repli... |
1424 |
audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
522ed7767 Audit: add TTY in... |
1425 1426 1427 |
break; } case AUDIT_TTY_SET: { |
a06e56b2a audit: log AUDIT_... |
1428 |
struct audit_tty_status s, old; |
a06e56b2a audit: log AUDIT_... |
1429 |
struct audit_buffer *ab; |
2e28d38ae tty: audit: Handl... |
1430 |
unsigned int t; |
0e23bacca audit: rework AUD... |
1431 1432 1433 |
memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ |
756125289 audit: always che... |
1434 |
memcpy(&s, data, min_t(size_t, sizeof(s), data_len)); |
0e23bacca audit: rework AUD... |
1435 1436 1437 1438 |
/* check if new data is valid */ if ((s.enabled != 0 && s.enabled != 1) || (s.log_passwd != 0 && s.log_passwd != 1)) err = -EINVAL; |
a06e56b2a audit: log AUDIT_... |
1439 |
|
2e28d38ae tty: audit: Handl... |
1440 1441 1442 1443 1444 |
if (err) t = READ_ONCE(current->signal->audit_tty); else { t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD); t = xchg(¤t->signal->audit_tty, t); |
0e23bacca audit: rework AUD... |
1445 |
} |
2e28d38ae tty: audit: Handl... |
1446 1447 |
old.enabled = t & AUDIT_TTY_ENABLE; old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); |
522ed7767 Audit: add TTY in... |
1448 |
|
626abcd13 audit: add syscal... |
1449 1450 |
audit_log_common_recv_msg(audit_context(), &ab, AUDIT_CONFIG_CHANGE); |
1ce319f11 audit: reorder AU... |
1451 1452 1453 1454 |
audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d" " old-log_passwd=%d new-log_passwd=%d res=%d", old.enabled, s.enabled, old.log_passwd, s.log_passwd, !err); |
a06e56b2a audit: log AUDIT_... |
1455 |
audit_log_end(ab); |
522ed7767 Audit: add TTY in... |
1456 1457 |
break; } |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 1463 1464 |
default: err = -EINVAL; break; } return err < 0 ? err : 0; } |
a9d162087 audit: combine au... |
1465 1466 1467 1468 1469 1470 |
/** * audit_receive - receive messages from a netlink control socket * @skb: the message buffer * * Parse the provided skb and deal with any messages that may be present, * malformed skbs are discarded. |
b0dd25a82 [PATCH] AUDIT: ke... |
1471 |
*/ |
a9d162087 audit: combine au... |
1472 |
static void audit_receive(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
1473 |
{ |
ea7ae60bf Audit: clean up a... |
1474 1475 |
struct nlmsghdr *nlh; /* |
941912133 audit: replace ob... |
1476 |
* len MUST be signed for nlmsg_next to be able to dec it below 0 |
ea7ae60bf Audit: clean up a... |
1477 1478 1479 1480 1481 1482 1483 |
* if the nlmsg_len was not aligned */ int len; int err; nlh = nlmsg_hdr(skb); len = skb->len; |
ce423631c audit: track the ... |
1484 |
audit_ctl_lock(); |
941912133 audit: replace ob... |
1485 |
while (nlmsg_ok(nlh, len)) { |
ea7ae60bf Audit: clean up a... |
1486 1487 1488 |
err = audit_receive_msg(skb, nlh); /* if err or if this message says it wants a response */ if (err || (nlh->nlmsg_flags & NLM_F_ACK)) |
2d4bc9336 netlink: extended... |
1489 |
netlink_ack(skb, nlh, err, NULL); |
ea7ae60bf Audit: clean up a... |
1490 |
|
2851da570 audit: pass int* ... |
1491 |
nlh = nlmsg_next(nlh, &len); |
1da177e4c Linux-2.6.12-rc2 |
1492 |
} |
ce423631c audit: track the ... |
1493 |
audit_ctl_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1494 |
} |
9d2161bed audit: log audit ... |
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 |
/* Log information about who is connecting to the audit multicast socket */ static void audit_log_multicast(int group, const char *op, int err) { const struct cred *cred; struct tty_struct *tty; char comm[sizeof(current->comm)]; struct audit_buffer *ab; if (!audit_enabled) return; ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_EVENT_LISTENER); if (!ab) return; cred = current_cred(); tty = audit_get_tty(); audit_log_format(ab, "pid=%u uid=%u auid=%u tty=%s ses=%u", task_pid_nr(current), from_kuid(&init_user_ns, cred->uid), from_kuid(&init_user_ns, audit_get_loginuid(current)), tty ? tty_name(tty) : "(none)", audit_get_sessionid(current)); audit_put_tty(tty); audit_log_task_context(ab); /* subj= */ audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_d_path_exe(ab, current->mm); /* exe= */ audit_log_format(ab, " nl-mcgrp=%d op=%s res=%d", group, op, !err); audit_log_end(ab); } |
3a101b8de audit: add netlin... |
1526 |
/* Run custom bind function on netlink socket group connect or bind requests. */ |
9d2161bed audit: log audit ... |
1527 |
static int audit_multicast_bind(struct net *net, int group) |
3a101b8de audit: add netlin... |
1528 |
{ |
9d2161bed audit: log audit ... |
1529 |
int err = 0; |
3a101b8de audit: add netlin... |
1530 |
if (!capable(CAP_AUDIT_READ)) |
9d2161bed audit: log audit ... |
1531 1532 1533 1534 |
err = -EPERM; audit_log_multicast(group, "connect", err); return err; } |
3a101b8de audit: add netlin... |
1535 |
|
9d2161bed audit: log audit ... |
1536 1537 1538 |
static void audit_multicast_unbind(struct net *net, int group) { audit_log_multicast(group, "disconnect", 0); |
3a101b8de audit: add netlin... |
1539 |
} |
33faba7fa audit: listen in ... |
1540 |
static int __net_init audit_net_init(struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
1541 |
{ |
a31f2d17b netlink: add netl... |
1542 1543 |
struct netlink_kernel_cfg cfg = { .input = audit_receive, |
9d2161bed audit: log audit ... |
1544 1545 |
.bind = audit_multicast_bind, .unbind = audit_multicast_unbind, |
451f92163 audit: add netlin... |
1546 1547 |
.flags = NL_CFG_F_NONROOT_RECV, .groups = AUDIT_NLGRP_MAX, |
a31f2d17b netlink: add netl... |
1548 |
}; |
f368c07d7 [PATCH] audit: pa... |
1549 |
|
33faba7fa audit: listen in ... |
1550 |
struct audit_net *aunet = net_generic(net, audit_net_id); |
5b52330bb audit: fix auditd... |
1551 1552 |
aunet->sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); if (aunet->sk == NULL) { |
33faba7fa audit: listen in ... |
1553 |
audit_panic("cannot initialize netlink socket in namespace"); |
11ee39ebf audit: print erro... |
1554 1555 |
return -ENOMEM; } |
5b52330bb audit: fix auditd... |
1556 |
aunet->sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
33faba7fa audit: listen in ... |
1557 1558 1559 1560 1561 1562 |
return 0; } static void __net_exit audit_net_exit(struct net *net) { struct audit_net *aunet = net_generic(net, audit_net_id); |
5b52330bb audit: fix auditd... |
1563 |
|
48d0e023a audit: fix the RC... |
1564 1565 1566 1567 1568 |
/* NOTE: you would think that we would want to check the auditd * connection and potentially reset it here if it lives in this * namespace, but since the auditd connection tracking struct holds a * reference to this namespace (see auditd_set()) we are only ever * going to get here after that connection has been released */ |
33faba7fa audit: listen in ... |
1569 |
|
5b52330bb audit: fix auditd... |
1570 |
netlink_kernel_release(aunet->sk); |
33faba7fa audit: listen in ... |
1571 |
} |
8626877b5 audit: fix locati... |
1572 |
static struct pernet_operations audit_net_ops __net_initdata = { |
33faba7fa audit: listen in ... |
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 |
.init = audit_net_init, .exit = audit_net_exit, .id = &audit_net_id, .size = sizeof(struct audit_net), }; /* Initialize audit support at boot time. */ static int __init audit_init(void) { int i; |
a3f07114e [PATCH] Audit: ma... |
1583 1584 |
if (audit_initialized == AUDIT_DISABLED) return 0; |
8cc96382d audit: use kmem_c... |
1585 1586 1587 |
audit_buffer_cache = kmem_cache_create("audit_buffer", sizeof(struct audit_buffer), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1588 |
|
af8b824f2 audit: rename the... |
1589 |
skb_queue_head_init(&audit_queue); |
c6480207f audit: rework the... |
1590 |
skb_queue_head_init(&audit_retry_queue); |
af8b824f2 audit: rename the... |
1591 |
skb_queue_head_init(&audit_hold_queue); |
3dc7e3153 [PATCH] support f... |
1592 |
|
f368c07d7 [PATCH] audit: pa... |
1593 1594 |
for (i = 0; i < AUDIT_INODE_BUCKETS; i++) INIT_LIST_HEAD(&audit_inode_hash[i]); |
f368c07d7 [PATCH] audit: pa... |
1595 |
|
ce423631c audit: track the ... |
1596 1597 |
mutex_init(&audit_cmd_mutex.lock); audit_cmd_mutex.owner = NULL; |
5b52330bb audit: fix auditd... |
1598 1599 1600 1601 1602 1603 |
pr_info("initializing netlink subsys (%s) ", audit_default ? "enabled" : "disabled"); register_pernet_subsys(&audit_net_ops); audit_initialized = AUDIT_INITIALIZED; |
5b52330bb audit: fix auditd... |
1604 |
|
6c9255645 audit: fixup audi... |
1605 1606 1607 1608 1609 1610 |
kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); if (IS_ERR(kauditd_task)) { int err = PTR_ERR(kauditd_task); panic("audit: failed to start the kauditd thread (%d) ", err); } |
7c397d01e audit: Make AUDIT... |
1611 1612 1613 |
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "state=initialized audit_enabled=%u res=1", audit_enabled); |
6c9255645 audit: fixup audi... |
1614 |
|
1da177e4c Linux-2.6.12-rc2 |
1615 1616 |
return 0; } |
be4104abf audit: initialize... |
1617 |
postcore_initcall(audit_init); |
1da177e4c Linux-2.6.12-rc2 |
1618 |
|
11dd26663 audit: do not pan... |
1619 1620 1621 1622 |
/* * Process kernel command-line parameter at boot time. * audit={0|off} or audit={1|on}. */ |
1da177e4c Linux-2.6.12-rc2 |
1623 1624 |
static int __init audit_enable(char *str) { |
11dd26663 audit: do not pan... |
1625 1626 1627 1628 1629 1630 1631 1632 1633 |
if (!strcasecmp(str, "off") || !strcmp(str, "0")) audit_default = AUDIT_OFF; else if (!strcasecmp(str, "on") || !strcmp(str, "1")) audit_default = AUDIT_ON; else { pr_err("audit: invalid 'audit' parameter value (%s) ", str); audit_default = AUDIT_ON; } |
80ab4df62 audit: don't use ... |
1634 1635 |
if (audit_default == AUDIT_OFF) |
a3f07114e [PATCH] Audit: ma... |
1636 |
audit_initialized = AUDIT_DISABLED; |
5d842a5b7 audit: use audit_... |
1637 |
if (audit_set_enabled(audit_default)) |
11dd26663 audit: do not pan... |
1638 1639 1640 |
pr_err("audit: error setting audit state (%d) ", audit_default); |
a3f07114e [PATCH] Audit: ma... |
1641 |
|
d957f7b72 audit: Use more c... |
1642 1643 |
pr_info("%s ", audit_default ? |
d3ca0344b audit: remove use... |
1644 |
"enabled (after initialization)" : "disabled (until reboot)"); |
a3f07114e [PATCH] Audit: ma... |
1645 |
|
9b41046cd [PATCH] Don't pas... |
1646 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1647 |
} |
1da177e4c Linux-2.6.12-rc2 |
1648 |
__setup("audit=", audit_enable); |
f910fde73 audit: add kernel... |
1649 1650 1651 1652 |
/* Process kernel command-line parameter at boot time. * audit_backlog_limit=<n> */ static int __init audit_backlog_limit_set(char *str) { |
3e1d0bb62 audit: Convert in... |
1653 |
u32 audit_backlog_limit_arg; |
d957f7b72 audit: Use more c... |
1654 |
|
f910fde73 audit: add kernel... |
1655 |
pr_info("audit_backlog_limit: "); |
3e1d0bb62 audit: Convert in... |
1656 1657 1658 |
if (kstrtouint(str, 0, &audit_backlog_limit_arg)) { pr_cont("using default of %u, unable to parse %s ", |
d957f7b72 audit: Use more c... |
1659 |
audit_backlog_limit, str); |
f910fde73 audit: add kernel... |
1660 1661 |
return 1; } |
3e1d0bb62 audit: Convert in... |
1662 1663 |
audit_backlog_limit = audit_backlog_limit_arg; |
d957f7b72 audit: Use more c... |
1664 1665 |
pr_cont("%d ", audit_backlog_limit); |
f910fde73 audit: add kernel... |
1666 1667 1668 1669 |
return 1; } __setup("audit_backlog_limit=", audit_backlog_limit_set); |
16e1904e6 AUDIT: Add helper... |
1670 1671 |
static void audit_buffer_free(struct audit_buffer *ab) { |
8fc6115c2 AUDIT: expand aud... |
1672 1673 |
if (!ab) return; |
d865e573b audit: Delete unn... |
1674 |
kfree_skb(ab->skb); |
8cc96382d audit: use kmem_c... |
1675 |
kmem_cache_free(audit_buffer_cache, ab); |
16e1904e6 AUDIT: Add helper... |
1676 |
} |
8cc96382d audit: use kmem_c... |
1677 1678 |
static struct audit_buffer *audit_buffer_alloc(struct audit_context *ctx, gfp_t gfp_mask, int type) |
16e1904e6 AUDIT: Add helper... |
1679 |
{ |
8cc96382d audit: use kmem_c... |
1680 |
struct audit_buffer *ab; |
8fc6115c2 AUDIT: expand aud... |
1681 |
|
8cc96382d audit: use kmem_c... |
1682 1683 1684 |
ab = kmem_cache_alloc(audit_buffer_cache, gfp_mask); if (!ab) return NULL; |
ee080e6ce Audit: cleanup ne... |
1685 1686 1687 |
ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); if (!ab->skb) |
c64e66c67 audit: netlink: M... |
1688 |
goto err; |
8cc96382d audit: use kmem_c... |
1689 1690 |
if (!nlmsg_put(ab->skb, 0, 0, type, 0, 0)) goto err; |
ee080e6ce Audit: cleanup ne... |
1691 |
|
8cc96382d audit: use kmem_c... |
1692 1693 |
ab->ctx = ctx; ab->gfp_mask = gfp_mask; |
ee080e6ce Audit: cleanup ne... |
1694 |
|
16e1904e6 AUDIT: Add helper... |
1695 |
return ab; |
ee080e6ce Audit: cleanup ne... |
1696 |
|
8fc6115c2 AUDIT: expand aud... |
1697 1698 1699 |
err: audit_buffer_free(ab); return NULL; |
16e1904e6 AUDIT: Add helper... |
1700 |
} |
1da177e4c Linux-2.6.12-rc2 |
1701 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
1702 1703 1704 1705 |
/** * audit_serial - compute a serial number for the audit record * * Compute a serial number for the audit record. Audit records are |
bfb4496e7 AUDIT: Assign ser... |
1706 1707 1708 1709 1710 1711 1712 |
* written to user-space as soon as they are generated, so a complete * audit record may be written in several pieces. The timestamp of the * record and this serial number are used by the user-space tools to * determine which pieces belong to the same audit record. The * (timestamp,serial) tuple is unique for each syscall and is live from * syscall entry to syscall exit. * |
bfb4496e7 AUDIT: Assign ser... |
1713 1714 1715 1716 |
* NOTE: Another possibility is to store the formatted records off the * audit context (for those records that have a context), and emit them * all at syscall exit. However, this could delay the reporting of * significant errors until syscall exit (or never, if the system |
b0dd25a82 [PATCH] AUDIT: ke... |
1717 1718 |
* halts). */ |
bfb4496e7 AUDIT: Assign ser... |
1719 1720 |
unsigned int audit_serial(void) { |
01478d7d6 audit: use atomic... |
1721 |
static atomic_t serial = ATOMIC_INIT(0); |
d5b454f2c AUDIT: Fix livelo... |
1722 |
|
01478d7d6 audit: use atomic... |
1723 |
return atomic_add_return(1, &serial); |
bfb4496e7 AUDIT: Assign ser... |
1724 |
} |
5600b8927 whitespace fixes:... |
1725 |
static inline void audit_get_stamp(struct audit_context *ctx, |
2115bb250 audit: Use timesp... |
1726 |
struct timespec64 *t, unsigned int *serial) |
bfb4496e7 AUDIT: Assign ser... |
1727 |
{ |
48887e63d [PATCH] fix broke... |
1728 |
if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
290e44b7d audit: use ktime_... |
1729 |
ktime_get_coarse_real_ts64(t); |
bfb4496e7 AUDIT: Assign ser... |
1730 1731 1732 |
*serial = audit_serial(); } } |
b0dd25a82 [PATCH] AUDIT: ke... |
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 |
/** * audit_log_start - obtain an audit buffer * @ctx: audit_context (may be NULL) * @gfp_mask: type of allocation * @type: audit message type * * Returns audit_buffer pointer on success or NULL on error. * * Obtain an audit buffer. This routine does locking to obtain the * audit buffer, but then no locking is required for calls to * audit_log_*format. If the task (ctx) is a task that is currently in a * syscall, then the syscall is marked as auditable and an audit record * will be written at syscall exit. If there is no associated task, then * task context (ctx) should be NULL. */ |
9796fdd82 [PATCH] gfp_t: ke... |
1748 |
struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
9ad9ad385 AUDIT: Wait for b... |
1749 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
1750 |
{ |
319754248 audit: rework aud... |
1751 |
struct audit_buffer *ab; |
2115bb250 audit: Use timesp... |
1752 |
struct timespec64 t; |
3f649ab72 treewide: Remove ... |
1753 |
unsigned int serial; |
1da177e4c Linux-2.6.12-rc2 |
1754 |
|
a3f07114e [PATCH] Audit: ma... |
1755 |
if (audit_initialized != AUDIT_INITIALIZED) |
1da177e4c Linux-2.6.12-rc2 |
1756 |
return NULL; |
d904ac032 audit: rename FIL... |
1757 |
if (unlikely(!audit_filter(type, AUDIT_FILTER_EXCLUDE))) |
c8edc80c8 [PATCH] Exclude m... |
1758 |
return NULL; |
5b52330bb audit: fix auditd... |
1759 |
/* NOTE: don't ever fail/sleep on these two conditions: |
a09cfa470 audit: don't ever... |
1760 1761 1762 1763 |
* 1. auditd generated record - since we need auditd to drain the * queue; also, when we are checking for auditd, compare PIDs using * task_tgid_vnr() since auditd_pid is set in audit_receive_msg() * using a PID anchored in the caller's namespace |
5b52330bb audit: fix auditd... |
1764 1765 |
* 2. generator holding the audit_cmd_mutex - we don't want to block * while holding the mutex */ |
ce423631c audit: track the ... |
1766 |
if (!(auditd_test_task(current) || audit_ctl_owner_current())) { |
5b52330bb audit: fix auditd... |
1767 |
long stime = audit_backlog_wait_time; |
319754248 audit: rework aud... |
1768 1769 1770 1771 1772 |
while (audit_backlog_limit && (skb_queue_len(&audit_queue) > audit_backlog_limit)) { /* wake kauditd to try and flush the queue */ wake_up_interruptible(&kauditd_wait); |
9ad9ad385 AUDIT: Wait for b... |
1773 |
|
319754248 audit: rework aud... |
1774 1775 |
/* sleep if we are allowed and we haven't exhausted our * backlog wait limit */ |
5b52330bb audit: fix auditd... |
1776 |
if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) { |
b43870c74 audit: report aud... |
1777 |
long rtime = stime; |
319754248 audit: rework aud... |
1778 1779 1780 1781 1782 |
DECLARE_WAITQUEUE(wait, current); add_wait_queue_exclusive(&audit_backlog_wait, &wait); set_current_state(TASK_UNINTERRUPTIBLE); |
b43870c74 audit: report aud... |
1783 1784 |
stime = schedule_timeout(rtime); atomic_add(rtime - stime, &audit_backlog_wait_time_actual); |
319754248 audit: rework aud... |
1785 1786 1787 1788 1789 1790 1791 1792 1793 |
remove_wait_queue(&audit_backlog_wait, &wait); } else { if (audit_rate_check() && printk_ratelimit()) pr_warn("audit_backlog=%d > audit_backlog_limit=%d ", skb_queue_len(&audit_queue), audit_backlog_limit); audit_log_lost("backlog limit exceeded"); return NULL; |
8ac1c8d5d audit: fix endles... |
1794 |
} |
9ad9ad385 AUDIT: Wait for b... |
1795 |
} |
fb19b4c6a AUDIT: Honour aud... |
1796 |
} |
9ad9ad385 AUDIT: Wait for b... |
1797 |
ab = audit_buffer_alloc(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
1798 1799 1800 1801 |
if (!ab) { audit_log_lost("out of memory in audit_log_start"); return NULL; } |
bfb4496e7 AUDIT: Assign ser... |
1802 |
audit_get_stamp(ab->ctx, &t, &serial); |
2115bb250 audit: Use timesp... |
1803 1804 |
audit_log_format(ab, "audit(%llu.%03lu:%u): ", (unsigned long long)t.tv_sec, t.tv_nsec/1000000, serial); |
319754248 audit: rework aud... |
1805 |
|
1da177e4c Linux-2.6.12-rc2 |
1806 1807 |
return ab; } |
8fc6115c2 AUDIT: expand aud... |
1808 |
/** |
5ac52f33b AUDIT: buffer aud... |
1809 |
* audit_expand - expand skb in the audit buffer |
8fc6115c2 AUDIT: expand aud... |
1810 |
* @ab: audit_buffer |
b0dd25a82 [PATCH] AUDIT: ke... |
1811 |
* @extra: space to add at tail of the skb |
8fc6115c2 AUDIT: expand aud... |
1812 1813 1814 1815 |
* * Returns 0 (no space) on failed expansion, or available space if * successful. */ |
e3b926b4c AUDIT: pass size ... |
1816 |
static inline int audit_expand(struct audit_buffer *ab, int extra) |
8fc6115c2 AUDIT: expand aud... |
1817 |
{ |
5ac52f33b AUDIT: buffer aud... |
1818 |
struct sk_buff *skb = ab->skb; |
406a1d868 [AUDIT]: Increase... |
1819 1820 1821 |
int oldtail = skb_tailroom(skb); int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); int newtail = skb_tailroom(skb); |
5ac52f33b AUDIT: buffer aud... |
1822 1823 |
if (ret < 0) { audit_log_lost("out of memory in audit_expand"); |
8fc6115c2 AUDIT: expand aud... |
1824 |
return 0; |
5ac52f33b AUDIT: buffer aud... |
1825 |
} |
406a1d868 [AUDIT]: Increase... |
1826 1827 1828 |
skb->truesize += newtail - oldtail; return newtail; |
8fc6115c2 AUDIT: expand aud... |
1829 |
} |
1da177e4c Linux-2.6.12-rc2 |
1830 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
1831 1832 |
/* * Format an audit message into the audit buffer. If there isn't enough |
1da177e4c Linux-2.6.12-rc2 |
1833 1834 |
* room in the audit buffer, more room will be allocated and vsnprint * will be called a second time. Currently, we assume that a printk |
b0dd25a82 [PATCH] AUDIT: ke... |
1835 1836 |
* can't format message larger than 1024 bytes, so we don't either. */ |
1da177e4c Linux-2.6.12-rc2 |
1837 1838 1839 1840 |
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, va_list args) { int len, avail; |
5ac52f33b AUDIT: buffer aud... |
1841 |
struct sk_buff *skb; |
eecb0a733 AUDIT: Fix abuse ... |
1842 |
va_list args2; |
1da177e4c Linux-2.6.12-rc2 |
1843 1844 1845 |
if (!ab) return; |
5ac52f33b AUDIT: buffer aud... |
1846 1847 1848 1849 |
BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); if (avail == 0) { |
e3b926b4c AUDIT: pass size ... |
1850 |
avail = audit_expand(ab, AUDIT_BUFSIZ); |
8fc6115c2 AUDIT: expand aud... |
1851 1852 |
if (!avail) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1853 |
} |
eecb0a733 AUDIT: Fix abuse ... |
1854 |
va_copy(args2, args); |
27a884dc3 [SK_BUFF]: Conver... |
1855 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
1da177e4c Linux-2.6.12-rc2 |
1856 1857 1858 1859 |
if (len >= avail) { /* The printk buffer is 1024 bytes long, so if we get * here and AUDIT_BUFSIZ is at least 1024, then we can * log everything that printk could have logged. */ |
b0dd25a82 [PATCH] AUDIT: ke... |
1860 1861 |
avail = audit_expand(ab, max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
8fc6115c2 AUDIT: expand aud... |
1862 |
if (!avail) |
a0e86bd42 audit: always fol... |
1863 |
goto out_va_end; |
27a884dc3 [SK_BUFF]: Conver... |
1864 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
1da177e4c Linux-2.6.12-rc2 |
1865 |
} |
168b71739 AUDIT: Clean up l... |
1866 1867 |
if (len > 0) skb_put(skb, len); |
a0e86bd42 audit: always fol... |
1868 1869 |
out_va_end: va_end(args2); |
8fc6115c2 AUDIT: expand aud... |
1870 1871 |
out: return; |
1da177e4c Linux-2.6.12-rc2 |
1872 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1873 1874 1875 1876 1877 1878 1879 1880 |
/** * audit_log_format - format a message into the audit buffer. * @ab: audit_buffer * @fmt: format string * @...: optional parameters matching @fmt string * * All the work is done in audit_log_vformat. */ |
1da177e4c Linux-2.6.12-rc2 |
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 |
void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) { va_list args; if (!ab) return; va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); } |
b0dd25a82 [PATCH] AUDIT: ke... |
1891 |
/** |
196a50855 audit: update the... |
1892 |
* audit_log_n_hex - convert a buffer to hex and append it to the audit skb |
b0dd25a82 [PATCH] AUDIT: ke... |
1893 1894 1895 1896 1897 1898 1899 1900 1901 |
* @ab: the audit_buffer * @buf: buffer to convert to hex * @len: length of @buf to be converted * * No return value; failure to expand is silently ignored. * * This function will take the passed buf and convert it into a string of * ascii hex digits. The new string is placed onto the skb. */ |
b556f8ad5 Audit: standardiz... |
1902 |
void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, |
168b71739 AUDIT: Clean up l... |
1903 |
size_t len) |
83c7d0917 AUDIT: Avoid log ... |
1904 |
{ |
168b71739 AUDIT: Clean up l... |
1905 1906 1907 |
int i, avail, new_len; unsigned char *ptr; struct sk_buff *skb; |
168b71739 AUDIT: Clean up l... |
1908 |
|
8ef2d3040 [PATCH] sanity ch... |
1909 1910 |
if (!ab) return; |
168b71739 AUDIT: Clean up l... |
1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 |
BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); new_len = len<<1; if (new_len >= avail) { /* Round the buffer request up to the next multiple */ new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); avail = audit_expand(ab, new_len); if (!avail) return; } |
83c7d0917 AUDIT: Avoid log ... |
1922 |
|
27a884dc3 [SK_BUFF]: Conver... |
1923 |
ptr = skb_tail_pointer(skb); |
b8dbc3241 audit: Use hex_by... |
1924 1925 |
for (i = 0; i < len; i++) ptr = hex_byte_pack_upper(ptr, buf[i]); |
168b71739 AUDIT: Clean up l... |
1926 1927 |
*ptr = 0; skb_put(skb, len << 1); /* new string is twice the old string */ |
83c7d0917 AUDIT: Avoid log ... |
1928 |
} |
9c937dcc7 [PATCH] log more ... |
1929 1930 1931 1932 |
/* * Format a string of no more than slen characters into the audit buffer, * enclosed in quote marks. */ |
b556f8ad5 Audit: standardiz... |
1933 1934 |
void audit_log_n_string(struct audit_buffer *ab, const char *string, size_t slen) |
9c937dcc7 [PATCH] log more ... |
1935 1936 1937 1938 |
{ int avail, new_len; unsigned char *ptr; struct sk_buff *skb; |
8ef2d3040 [PATCH] sanity ch... |
1939 1940 |
if (!ab) return; |
9c937dcc7 [PATCH] log more ... |
1941 1942 1943 1944 1945 1946 1947 1948 1949 |
BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); new_len = slen + 3; /* enclosing quotes + null terminator */ if (new_len > avail) { avail = audit_expand(ab, new_len); if (!avail) return; } |
27a884dc3 [SK_BUFF]: Conver... |
1950 |
ptr = skb_tail_pointer(skb); |
9c937dcc7 [PATCH] log more ... |
1951 1952 1953 1954 1955 1956 1957 |
*ptr++ = '"'; memcpy(ptr, string, slen); ptr += slen; *ptr++ = '"'; *ptr = 0; skb_put(skb, slen + 2); /* don't include null terminator */ } |
b0dd25a82 [PATCH] AUDIT: ke... |
1958 |
/** |
de6bbd1d3 [AUDIT] break lar... |
1959 |
* audit_string_contains_control - does a string need to be logged in hex |
f706d5d22 audit: silence tw... |
1960 1961 |
* @string: string to be checked * @len: max length of the string to check |
de6bbd1d3 [AUDIT] break lar... |
1962 |
*/ |
9fcf836b2 audit: audit_stri... |
1963 |
bool audit_string_contains_control(const char *string, size_t len) |
de6bbd1d3 [AUDIT] break lar... |
1964 1965 |
{ const unsigned char *p; |
b3897f567 Audit: fix handli... |
1966 |
for (p = string; p < (const unsigned char *)string + len; p++) { |
1d6c9649e kernel/audit.c co... |
1967 |
if (*p == '"' || *p < 0x21 || *p > 0x7e) |
9fcf836b2 audit: audit_stri... |
1968 |
return true; |
de6bbd1d3 [AUDIT] break lar... |
1969 |
} |
9fcf836b2 audit: audit_stri... |
1970 |
return false; |
de6bbd1d3 [AUDIT] break lar... |
1971 1972 1973 |
} /** |
522ed7767 Audit: add TTY in... |
1974 |
* audit_log_n_untrustedstring - log a string that may contain random characters |
b0dd25a82 [PATCH] AUDIT: ke... |
1975 |
* @ab: audit_buffer |
f706d5d22 audit: silence tw... |
1976 |
* @len: length of string (not including trailing null) |
b0dd25a82 [PATCH] AUDIT: ke... |
1977 1978 1979 1980 |
* @string: string to be logged * * This code will escape a string that is passed to it if the string * contains a control character, unprintable character, double quote mark, |
168b71739 AUDIT: Clean up l... |
1981 |
* or a space. Unescaped strings will start and end with a double quote mark. |
b0dd25a82 [PATCH] AUDIT: ke... |
1982 |
* Strings that are escaped are printed in hex (2 digits per char). |
9c937dcc7 [PATCH] log more ... |
1983 1984 1985 |
* * The caller specifies the number of characters in the string to log, which may * or may not be the entire string. |
b0dd25a82 [PATCH] AUDIT: ke... |
1986 |
*/ |
b556f8ad5 Audit: standardiz... |
1987 1988 |
void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, size_t len) |
83c7d0917 AUDIT: Avoid log ... |
1989 |
{ |
de6bbd1d3 [AUDIT] break lar... |
1990 |
if (audit_string_contains_control(string, len)) |
b556f8ad5 Audit: standardiz... |
1991 |
audit_log_n_hex(ab, string, len); |
de6bbd1d3 [AUDIT] break lar... |
1992 |
else |
b556f8ad5 Audit: standardiz... |
1993 |
audit_log_n_string(ab, string, len); |
83c7d0917 AUDIT: Avoid log ... |
1994 |
} |
9c937dcc7 [PATCH] log more ... |
1995 |
/** |
522ed7767 Audit: add TTY in... |
1996 |
* audit_log_untrustedstring - log a string that may contain random characters |
9c937dcc7 [PATCH] log more ... |
1997 1998 1999 |
* @ab: audit_buffer * @string: string to be logged * |
522ed7767 Audit: add TTY in... |
2000 |
* Same as audit_log_n_untrustedstring(), except that strlen is used to |
9c937dcc7 [PATCH] log more ... |
2001 2002 |
* determine string length. */ |
de6bbd1d3 [AUDIT] break lar... |
2003 |
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
9c937dcc7 [PATCH] log more ... |
2004 |
{ |
b556f8ad5 Audit: standardiz... |
2005 |
audit_log_n_untrustedstring(ab, string, strlen(string)); |
9c937dcc7 [PATCH] log more ... |
2006 |
} |
168b71739 AUDIT: Clean up l... |
2007 |
/* This is a helper-function to print the escaped d_path */ |
1da177e4c Linux-2.6.12-rc2 |
2008 |
void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
66b3fad3f constify path arg... |
2009 |
const struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
2010 |
{ |
44707fdf5 d_path: Use struc... |
2011 |
char *p, *pathname; |
1da177e4c Linux-2.6.12-rc2 |
2012 |
|
8fc6115c2 AUDIT: expand aud... |
2013 |
if (prefix) |
c158a35c8 audit: no leading... |
2014 |
audit_log_format(ab, "%s", prefix); |
1da177e4c Linux-2.6.12-rc2 |
2015 |
|
168b71739 AUDIT: Clean up l... |
2016 |
/* We will allow 11 spaces for ' (deleted)' to be appended */ |
44707fdf5 d_path: Use struc... |
2017 2018 |
pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); if (!pathname) { |
f1d9b23ca audit: purge audi... |
2019 |
audit_log_format(ab, "\"<no_memory>\""); |
168b71739 AUDIT: Clean up l... |
2020 |
return; |
1da177e4c Linux-2.6.12-rc2 |
2021 |
} |
cf28b4863 d_path: Make d_pa... |
2022 |
p = d_path(path, pathname, PATH_MAX+11); |
168b71739 AUDIT: Clean up l... |
2023 2024 |
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ /* FIXME: can we save some information here? */ |
f1d9b23ca audit: purge audi... |
2025 |
audit_log_format(ab, "\"<too_long>\""); |
5600b8927 whitespace fixes:... |
2026 |
} else |
168b71739 AUDIT: Clean up l... |
2027 |
audit_log_untrustedstring(ab, p); |
44707fdf5 d_path: Use struc... |
2028 |
kfree(pathname); |
1da177e4c Linux-2.6.12-rc2 |
2029 |
} |
4d3fb709b helper for some s... |
2030 2031 |
void audit_log_session_info(struct audit_buffer *ab) { |
4440e8548 audit: convert al... |
2032 |
unsigned int sessionid = audit_get_sessionid(current); |
4d3fb709b helper for some s... |
2033 |
uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
a2c97da11 audit: use sessio... |
2034 |
audit_log_format(ab, "auid=%u ses=%u", auid, sessionid); |
4d3fb709b helper for some s... |
2035 |
} |
9d9609851 Audit: clean up a... |
2036 2037 2038 2039 2040 2041 2042 2043 |
void audit_log_key(struct audit_buffer *ab, char *key) { audit_log_format(ab, " key="); if (key) audit_log_untrustedstring(ab, key); else audit_log_format(ab, "(null)"); } |
b24a30a73 audit: fix event ... |
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 |
int audit_log_task_context(struct audit_buffer *ab) { char *ctx = NULL; unsigned len; int error; u32 sid; security_task_getsecid(current, &sid); if (!sid) return 0; error = security_secid_to_secctx(sid, &ctx, &len); if (error) { if (error != -EINVAL) goto error_path; return 0; } audit_log_format(ab, " subj=%s", ctx); security_release_secctx(ctx, len); return 0; error_path: audit_panic("error in audit_log_task_context"); return error; } EXPORT_SYMBOL(audit_log_task_context); |
4766b199e audit: consolidat... |
2071 2072 2073 |
void audit_log_d_path_exe(struct audit_buffer *ab, struct mm_struct *mm) { |
5b2825527 audit: reduce mma... |
2074 2075 2076 2077 |
struct file *exe_file; if (!mm) goto out_null; |
4766b199e audit: consolidat... |
2078 |
|
5b2825527 audit: reduce mma... |
2079 2080 2081 2082 2083 2084 2085 2086 2087 |
exe_file = get_mm_exe_file(mm); if (!exe_file) goto out_null; audit_log_d_path(ab, " exe=", &exe_file->f_path); fput(exe_file); return; out_null: audit_log_format(ab, " exe=(null)"); |
4766b199e audit: consolidat... |
2088 |
} |
2a1fe215e audit: use curren... |
2089 |
struct tty_struct *audit_get_tty(void) |
3f5be2da8 audit: move audit... |
2090 2091 2092 |
{ struct tty_struct *tty = NULL; unsigned long flags; |
2a1fe215e audit: use curren... |
2093 2094 2095 2096 |
spin_lock_irqsave(¤t->sighand->siglock, flags); if (current->signal) tty = tty_kref_get(current->signal->tty); spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
3f5be2da8 audit: move audit... |
2097 2098 2099 2100 2101 2102 2103 |
return tty; } void audit_put_tty(struct tty_struct *tty) { tty_kref_put(tty); } |
2a1fe215e audit: use curren... |
2104 |
void audit_log_task_info(struct audit_buffer *ab) |
b24a30a73 audit: fix event ... |
2105 2106 |
{ const struct cred *cred; |
2a1fe215e audit: use curren... |
2107 |
char comm[sizeof(current->comm)]; |
db0a6fb5d audit: add tty fi... |
2108 |
struct tty_struct *tty; |
b24a30a73 audit: fix event ... |
2109 2110 2111 |
if (!ab) return; |
b24a30a73 audit: fix event ... |
2112 |
cred = current_cred(); |
2a1fe215e audit: use curren... |
2113 |
tty = audit_get_tty(); |
b24a30a73 audit: fix event ... |
2114 |
audit_log_format(ab, |
c92cdeb45 audit: convert PP... |
2115 |
" ppid=%d pid=%d auid=%u uid=%u gid=%u" |
b24a30a73 audit: fix event ... |
2116 |
" euid=%u suid=%u fsuid=%u" |
2f2ad1013 audit: restore or... |
2117 |
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
2a1fe215e audit: use curren... |
2118 2119 2120 |
task_ppid_nr(current), task_tgid_nr(current), from_kuid(&init_user_ns, audit_get_loginuid(current)), |
b24a30a73 audit: fix event ... |
2121 2122 2123 2124 2125 2126 2127 2128 |
from_kuid(&init_user_ns, cred->uid), from_kgid(&init_user_ns, cred->gid), from_kuid(&init_user_ns, cred->euid), from_kuid(&init_user_ns, cred->suid), from_kuid(&init_user_ns, cred->fsuid), from_kgid(&init_user_ns, cred->egid), from_kgid(&init_user_ns, cred->sgid), from_kgid(&init_user_ns, cred->fsgid), |
db0a6fb5d audit: add tty fi... |
2129 |
tty ? tty_name(tty) : "(none)", |
2a1fe215e audit: use curren... |
2130 |
audit_get_sessionid(current)); |
db0a6fb5d audit: add tty fi... |
2131 |
audit_put_tty(tty); |
b24a30a73 audit: fix event ... |
2132 |
audit_log_format(ab, " comm="); |
2a1fe215e audit: use curren... |
2133 2134 |
audit_log_untrustedstring(ab, get_task_comm(comm, current)); audit_log_d_path_exe(ab, current->mm); |
b24a30a73 audit: fix event ... |
2135 2136 2137 |
audit_log_task_context(ab); } EXPORT_SYMBOL(audit_log_task_info); |
b0dd25a82 [PATCH] AUDIT: ke... |
2138 |
/** |
245d73698 audit: Report sus... |
2139 2140 2141 |
* audit_log_path_denied - report a path restriction denial * @type: audit message type (AUDIT_ANOM_LINK, AUDIT_ANOM_CREAT, etc) * @operation: specific operation name |
a51d9eaa4 fs: add link rest... |
2142 |
*/ |
245d73698 audit: Report sus... |
2143 |
void audit_log_path_denied(int type, const char *operation) |
a51d9eaa4 fs: add link rest... |
2144 2145 |
{ struct audit_buffer *ab; |
b24a30a73 audit: fix event ... |
2146 |
|
15564ff0a audit: make ANOM_... |
2147 |
if (!audit_enabled || audit_dummy_context()) |
b24a30a73 audit: fix event ... |
2148 |
return; |
a51d9eaa4 fs: add link rest... |
2149 |
|
245d73698 audit: Report sus... |
2150 2151 |
/* Generate log with subject, operation, outcome. */ ab = audit_log_start(audit_context(), GFP_KERNEL, type); |
d1c7d97ad fs: handle failed... |
2152 |
if (!ab) |
45b578fe4 audit: link denie... |
2153 |
return; |
b24a30a73 audit: fix event ... |
2154 |
audit_log_format(ab, "op=%s", operation); |
2a1fe215e audit: use curren... |
2155 |
audit_log_task_info(ab); |
b24a30a73 audit: fix event ... |
2156 |
audit_log_format(ab, " res=0"); |
a51d9eaa4 fs: add link rest... |
2157 2158 |
audit_log_end(ab); } |
4b7d248b3 audit: move login... |
2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 |
/* global counter which is incremented every time something logs in */ static atomic_t session_id = ATOMIC_INIT(0); static int audit_set_loginuid_perm(kuid_t loginuid) { /* if we are unset, we don't need privs */ if (!audit_loginuid_set(current)) return 0; /* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/ if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE)) return -EPERM; /* it is set, you need permission */ if (!capable(CAP_AUDIT_CONTROL)) return -EPERM; /* reject if this is not an unset and we don't allow that */ if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID) && uid_valid(loginuid)) return -EPERM; return 0; } static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, unsigned int oldsessionid, unsigned int sessionid, int rc) { struct audit_buffer *ab; uid_t uid, oldloginuid, loginuid; struct tty_struct *tty; if (!audit_enabled) return; |
73e65b88f audit: connect LO... |
2190 |
ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_LOGIN); |
4b7d248b3 audit: move login... |
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 |
if (!ab) return; uid = from_kuid(&init_user_ns, task_uid(current)); oldloginuid = from_kuid(&init_user_ns, koldloginuid); loginuid = from_kuid(&init_user_ns, kloginuid), tty = audit_get_tty(); audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid); audit_log_task_context(ab); audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d", oldloginuid, loginuid, tty ? tty_name(tty) : "(none)", oldsessionid, sessionid, !rc); audit_put_tty(tty); audit_log_end(ab); } /** * audit_set_loginuid - set current task's loginuid * @loginuid: loginuid value * * Returns 0. * * Called (set) from fs/proc/base.c::proc_loginuid_write(). */ int audit_set_loginuid(kuid_t loginuid) { unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET; kuid_t oldloginuid; int rc; oldloginuid = audit_get_loginuid(current); oldsessionid = audit_get_sessionid(current); rc = audit_set_loginuid_perm(loginuid); if (rc) goto out; /* are we setting or clearing? */ if (uid_valid(loginuid)) { sessionid = (unsigned int)atomic_inc_return(&session_id); if (unlikely(sessionid == AUDIT_SID_UNSET)) sessionid = (unsigned int)atomic_inc_return(&session_id); } current->sessionid = sessionid; current->loginuid = loginuid; out: audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc); return rc; } |
a51d9eaa4 fs: add link rest... |
2242 |
/** |
b48345aaf audit: deliver si... |
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 |
* audit_signal_info - record signal info for shutting down audit subsystem * @sig: signal value * @t: task being signaled * * If the audit subsystem is being terminated, record the task (pid) * and uid that is doing that. */ int audit_signal_info(int sig, struct task_struct *t) { kuid_t uid = current_uid(), auid; if (auditd_test_task(t) && (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2)) { audit_sig_pid = task_tgid_nr(current); auid = audit_get_loginuid(current); if (uid_valid(auid)) audit_sig_uid = auid; else audit_sig_uid = uid; security_task_getsecid(current, &audit_sig_sid); } return audit_signal_info_syscall(t); } /** |
b0dd25a82 [PATCH] AUDIT: ke... |
2270 2271 2272 |
* audit_log_end - end one audit record * @ab: the audit_buffer * |
4aa83872d audit: queue netl... |
2273 2274 2275 2276 |
* We can not do a netlink send inside an irq context because it blocks (last * arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed on a * queue and a tasklet is scheduled to remove them from the queue outside the * irq context. May be called in any context. |
b0dd25a82 [PATCH] AUDIT: ke... |
2277 |
*/ |
b7d112581 AUDIT: Send netli... |
2278 |
void audit_log_end(struct audit_buffer *ab) |
1da177e4c Linux-2.6.12-rc2 |
2279 |
{ |
5b52330bb audit: fix auditd... |
2280 2281 |
struct sk_buff *skb; struct nlmsghdr *nlh; |
1da177e4c Linux-2.6.12-rc2 |
2282 2283 |
if (!ab) return; |
5b52330bb audit: fix auditd... |
2284 2285 2286 |
if (audit_rate_check()) { skb = ab->skb; |
f3d357b09 Audit: save audit... |
2287 |
ab->skb = NULL; |
5b52330bb audit: fix auditd... |
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 |
/* setup the netlink header, see the comments in * kauditd_send_multicast_skb() for length quirks */ nlh = nlmsg_hdr(skb); nlh->nlmsg_len = skb->len - NLMSG_HDRLEN; /* queue the netlink packet and poke the kauditd thread */ skb_queue_tail(&audit_queue, skb); wake_up_interruptible(&kauditd_wait); } else audit_log_lost("rate limit exceeded"); |
16e1904e6 AUDIT: Add helper... |
2299 |
audit_buffer_free(ab); |
1da177e4c Linux-2.6.12-rc2 |
2300 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 |
/** * audit_log - Log an audit record * @ctx: audit context * @gfp_mask: type of allocation * @type: audit message type * @fmt: format string to use * @...: variable parameters matching the format string * * This is a convenience function that calls audit_log_start, * audit_log_vformat, and audit_log_end. It may be called * in any context. */ |
5600b8927 whitespace fixes:... |
2313 |
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
9ad9ad385 AUDIT: Wait for b... |
2314 |
const char *fmt, ...) |
1da177e4c Linux-2.6.12-rc2 |
2315 2316 2317 |
{ struct audit_buffer *ab; va_list args; |
9ad9ad385 AUDIT: Wait for b... |
2318 |
ab = audit_log_start(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
2319 2320 2321 2322 2323 2324 2325 |
if (ab) { va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); audit_log_end(ab); } } |
bf45da97a [PATCH] EXPORT_SY... |
2326 2327 2328 2329 2330 |
EXPORT_SYMBOL(audit_log_start); EXPORT_SYMBOL(audit_log_end); EXPORT_SYMBOL(audit_log_format); EXPORT_SYMBOL(audit_log); |