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kernel/audit.c
51 KB
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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. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * 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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* Example user-space utilities: http://people.redhat.com/sgrubb/audit/ |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/init.h> |
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#include <asm/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/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/tty.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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#define AUDIT_OFF 0 #define AUDIT_ON 1 #define AUDIT_LOCKED 2 |
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u32 audit_enabled; u32 audit_ever_enabled; |
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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; |
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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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|
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/* * If audit records are to be written to the netlink socket, audit_pid |
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* contains the pid of the auditd process and audit_nlk_portid contains * the portid to use to send netlink messages to that process. |
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*/ |
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int audit_pid; |
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static __u32 audit_nlk_portid; |
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|
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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; static u32 audit_backlog_wait_overflow = 0; |
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|
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/* The identity of the user shutting down the audit system. */ |
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kuid_t audit_sig_uid = INVALID_UID; |
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pid_t audit_sig_pid = -1; |
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u32 audit_sig_sid = 0; |
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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 */ static atomic_t audit_lost = ATOMIC_INIT(0); /* The netlink socket. */ static struct sock *audit_sock; |
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int audit_net_id; |
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|
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/* Hash for inode-based rules */ struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; |
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/* The audit_freelist is a list of pre-allocated audit buffers (if more |
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* than AUDIT_MAXFREE are in use, the audit buffer is freed instead of * being placed on the freelist). */ |
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static DEFINE_SPINLOCK(audit_freelist_lock); |
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static int audit_freelist_count; |
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static LIST_HEAD(audit_freelist); |
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static struct sk_buff_head audit_skb_queue; |
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/* queue of skbs to send to auditd when/if it comes back */ static struct sk_buff_head audit_skb_hold_queue; |
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static struct task_struct *kauditd_task; static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); |
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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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/* Serialize requests from userspace. */ |
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DEFINE_MUTEX(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 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ #define AUDIT_MAXFREE (2*NR_CPUS) /* 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 { struct list_head list; |
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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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static void audit_set_portid(struct audit_buffer *ab, __u32 portid) |
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{ |
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if (ab) { struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
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nlh->nlmsg_pid = portid; |
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} |
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} |
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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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/* test audit_pid since printk is always losey, why bother? */ if (audit_pid) 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(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
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if (unlikely(!ab)) return rc; |
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audit_log_format(ab, "%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", &audit_backlog_wait_time, timeout); } |
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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_OFF || state > AUDIT_LOCKED) 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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{ |
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if (state != AUDIT_FAIL_SILENT && state != AUDIT_FAIL_PRINTK && state != AUDIT_FAIL_PANIC) return -EINVAL; |
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return audit_do_config_change("audit_failure", &audit_failure, state); |
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} |
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/* * Queue skbs to be sent to auditd when/if it comes back. These skbs should * already have been sent via prink/syslog and so if these messages are dropped * it is not a huge concern since we already passed the audit_log_lost() * notification and stuff. This is just nice to get audit messages during * boot before auditd is running or messages generated while auditd is stopped. * This only holds messages is audit_default is set, aka booting with audit=1 * or building your kernel that way. */ static void audit_hold_skb(struct sk_buff *skb) { if (audit_default && |
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(!audit_backlog_limit || skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)) |
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skb_queue_tail(&audit_skb_hold_queue, skb); else kfree_skb(skb); } |
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/* * For one reason or another this nlh isn't getting delivered to the userspace * audit daemon, just send it to printk. */ static void audit_printk_skb(struct sk_buff *skb) { struct nlmsghdr *nlh = nlmsg_hdr(skb); |
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char *data = nlmsg_data(nlh); |
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if (nlh->nlmsg_type != AUDIT_EOE) { if (printk_ratelimit()) |
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pr_notice("type=%d %s ", nlh->nlmsg_type, data); |
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else |
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audit_log_lost("printk limit exceeded"); |
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} audit_hold_skb(skb); } |
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static void kauditd_send_skb(struct sk_buff *skb) { int err; /* take a reference in case we can't send it and we want to hold it */ skb_get(skb); |
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err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
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if (err < 0) { |
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BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */ |
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if (audit_pid) { |
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pr_err("*NO* daemon at audit_pid=%d ", audit_pid); |
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audit_log_lost("auditd disappeared"); |
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audit_pid = 0; audit_sock = NULL; } |
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/* we might get lucky and get this in the next auditd */ audit_hold_skb(skb); } else /* drop the extra reference if sent ok */ |
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consume_skb(skb); |
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} |
b551d1d98 audit: refactor h... |
409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 |
/* * flush_hold_queue - empty the hold queue if auditd appears * * If auditd just started, drain the queue of messages already * sent to syslog/printk. Remember loss here is ok. We already * called audit_log_lost() if it didn't go out normally. so the * race between the skb_dequeue and the next check for audit_pid * doesn't matter. * * If you ever find kauditd to be too slow we can get a perf win * by doing our own locking and keeping better track if there * are messages in this queue. I don't see the need now, but * in 5 years when I want to play with this again I'll see this * note and still have no friggin idea what i'm thinking today. */ static void flush_hold_queue(void) |
b7d112581 AUDIT: Send netli... |
425 426 |
{ struct sk_buff *skb; |
b551d1d98 audit: refactor h... |
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 |
if (!audit_default || !audit_pid) return; skb = skb_dequeue(&audit_skb_hold_queue); if (likely(!skb)) return; while (skb && audit_pid) { kauditd_send_skb(skb); skb = skb_dequeue(&audit_skb_hold_queue); } /* * if auditd just disappeared but we * dequeued an skb we need to drop ref */ if (skb) consume_skb(skb); } |
97a41e261 [PATCH] kernel/: ... |
446 |
static int kauditd_thread(void *dummy) |
b7d112581 AUDIT: Send netli... |
447 |
{ |
831441862 Freezer: make ker... |
448 |
set_freezable(); |
4899b8b16 [PATCH] kauditd_t... |
449 |
while (!kthread_should_stop()) { |
3320c5133 audit: flatten ka... |
450 451 |
struct sk_buff *skb; DECLARE_WAITQUEUE(wait, current); |
b551d1d98 audit: refactor h... |
452 |
flush_hold_queue(); |
f3d357b09 Audit: save audit... |
453 |
|
b7d112581 AUDIT: Send netli... |
454 |
skb = skb_dequeue(&audit_skb_queue); |
db8973194 audit: efficiency... |
455 |
|
b7d112581 AUDIT: Send netli... |
456 |
if (skb) { |
db8973194 audit: efficiency... |
457 458 |
if (skb_queue_len(&audit_skb_queue) <= audit_backlog_limit) wake_up(&audit_backlog_wait); |
f3d357b09 Audit: save audit... |
459 460 |
if (audit_pid) kauditd_send_skb(skb); |
038cbcf65 Audit: unify the ... |
461 462 |
else audit_printk_skb(skb); |
3320c5133 audit: flatten ka... |
463 464 465 466 |
continue; } set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&kauditd_wait, &wait); |
b7d112581 AUDIT: Send netli... |
467 |
|
3320c5133 audit: flatten ka... |
468 469 470 |
if (!skb_queue_len(&audit_skb_queue)) { try_to_freeze(); schedule(); |
b7d112581 AUDIT: Send netli... |
471 |
} |
3320c5133 audit: flatten ka... |
472 473 474 |
__set_current_state(TASK_RUNNING); remove_wait_queue(&kauditd_wait, &wait); |
b7d112581 AUDIT: Send netli... |
475 |
} |
4899b8b16 [PATCH] kauditd_t... |
476 |
return 0; |
b7d112581 AUDIT: Send netli... |
477 |
} |
9044e6bca [PATCH] fix deadl... |
478 479 480 |
int audit_send_list(void *_dest) { struct audit_netlink_list *dest = _dest; |
9044e6bca [PATCH] fix deadl... |
481 |
struct sk_buff *skb; |
48095d991 audit: Use struct... |
482 |
struct net *net = dest->net; |
33faba7fa audit: listen in ... |
483 |
struct audit_net *aunet = net_generic(net, audit_net_id); |
9044e6bca [PATCH] fix deadl... |
484 485 |
/* wait for parent to finish and send an ACK */ |
f368c07d7 [PATCH] audit: pa... |
486 487 |
mutex_lock(&audit_cmd_mutex); mutex_unlock(&audit_cmd_mutex); |
9044e6bca [PATCH] fix deadl... |
488 489 |
while ((skb = __skb_dequeue(&dest->q)) != NULL) |
33faba7fa audit: listen in ... |
490 |
netlink_unicast(aunet->nlsk, skb, dest->portid, 0); |
9044e6bca [PATCH] fix deadl... |
491 |
|
48095d991 audit: Use struct... |
492 |
put_net(net); |
9044e6bca [PATCH] fix deadl... |
493 494 495 496 |
kfree(dest); return 0; } |
f9441639e audit: fix netlin... |
497 |
struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done, |
b8800aa5d audit: make funct... |
498 |
int multi, const void *payload, int size) |
9044e6bca [PATCH] fix deadl... |
499 500 501 |
{ struct sk_buff *skb; struct nlmsghdr *nlh; |
9044e6bca [PATCH] fix deadl... |
502 503 504 |
void *data; int flags = multi ? NLM_F_MULTI : 0; int t = done ? NLMSG_DONE : type; |
ee080e6ce Audit: cleanup ne... |
505 |
skb = nlmsg_new(size, GFP_KERNEL); |
9044e6bca [PATCH] fix deadl... |
506 507 |
if (!skb) return NULL; |
f9441639e audit: fix netlin... |
508 |
nlh = nlmsg_put(skb, portid, seq, t, size, flags); |
c64e66c67 audit: netlink: M... |
509 510 511 |
if (!nlh) goto out_kfree_skb; data = nlmsg_data(nlh); |
9044e6bca [PATCH] fix deadl... |
512 513 |
memcpy(data, payload, size); return skb; |
c64e66c67 audit: netlink: M... |
514 515 |
out_kfree_skb: kfree_skb(skb); |
9044e6bca [PATCH] fix deadl... |
516 517 |
return NULL; } |
f09ac9db2 Audit: stop deadl... |
518 519 520 |
static int audit_send_reply_thread(void *arg) { struct audit_reply *reply = (struct audit_reply *)arg; |
48095d991 audit: Use struct... |
521 |
struct net *net = reply->net; |
33faba7fa audit: listen in ... |
522 |
struct audit_net *aunet = net_generic(net, audit_net_id); |
f09ac9db2 Audit: stop deadl... |
523 524 525 526 527 528 |
mutex_lock(&audit_cmd_mutex); mutex_unlock(&audit_cmd_mutex); /* Ignore failure. It'll only happen if the sender goes away, because our timeout is set to infinite. */ |
33faba7fa audit: listen in ... |
529 |
netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0); |
48095d991 audit: Use struct... |
530 |
put_net(net); |
f09ac9db2 Audit: stop deadl... |
531 532 533 |
kfree(reply); return 0; } |
b0dd25a82 [PATCH] AUDIT: ke... |
534 535 |
/** * audit_send_reply - send an audit reply message via netlink |
d211f177b audit: Update kdo... |
536 |
* @request_skb: skb of request we are replying to (used to target the reply) |
b0dd25a82 [PATCH] AUDIT: ke... |
537 538 539 540 541 542 543 |
* @seq: sequence number * @type: audit message type * @done: done (last) flag * @multi: multi-part message flag * @payload: payload data * @size: payload size * |
f9441639e audit: fix netlin... |
544 |
* Allocates an skb, builds the netlink message, and sends it to the port id. |
b0dd25a82 [PATCH] AUDIT: ke... |
545 546 |
* No failure notifications. */ |
6f285b19d audit: Send repli... |
547 |
static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done, |
f9441639e audit: fix netlin... |
548 |
int multi, const void *payload, int size) |
1da177e4c Linux-2.6.12-rc2 |
549 |
{ |
6f285b19d audit: Send repli... |
550 551 |
u32 portid = NETLINK_CB(request_skb).portid; struct net *net = sock_net(NETLINK_CB(request_skb).sk); |
f09ac9db2 Audit: stop deadl... |
552 553 554 555 556 557 558 |
struct sk_buff *skb; struct task_struct *tsk; struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), GFP_KERNEL); if (!reply) return; |
f9441639e audit: fix netlin... |
559 |
skb = audit_make_reply(portid, seq, type, done, multi, payload, size); |
1da177e4c Linux-2.6.12-rc2 |
560 |
if (!skb) |
fcaf1eb86 [patch 1/1] audit... |
561 |
goto out; |
f09ac9db2 Audit: stop deadl... |
562 |
|
6f285b19d audit: Send repli... |
563 |
reply->net = get_net(net); |
f9441639e audit: fix netlin... |
564 |
reply->portid = portid; |
f09ac9db2 Audit: stop deadl... |
565 566 567 |
reply->skb = skb; tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); |
fcaf1eb86 [patch 1/1] audit... |
568 569 570 571 572 |
if (!IS_ERR(tsk)) return; kfree_skb(skb); out: kfree(reply); |
1da177e4c Linux-2.6.12-rc2 |
573 574 575 576 577 578 |
} /* * Check for appropriate CAP_AUDIT_ capabilities on incoming audit * control messages. */ |
c7bdb545d [NETLINK]: Encaps... |
579 |
static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
1da177e4c Linux-2.6.12-rc2 |
580 581 |
{ int err = 0; |
5a3cb3b6c audit: allow user... |
582 |
/* Only support initial user namespace for now. */ |
aa4af831b AUDIT: Allow logi... |
583 584 585 586 587 588 589 590 591 592 |
/* * 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... |
593 |
if (current_user_ns() != &init_user_ns) |
aa4af831b AUDIT: Allow logi... |
594 |
return -ECONNREFUSED; |
34e36d8ec audit: Limit audi... |
595 |
|
1da177e4c Linux-2.6.12-rc2 |
596 |
switch (msg_type) { |
1da177e4c Linux-2.6.12-rc2 |
597 |
case AUDIT_LIST: |
1da177e4c Linux-2.6.12-rc2 |
598 599 |
case AUDIT_ADD: case AUDIT_DEL: |
189009091 audit: remove the... |
600 601 602 |
return -EOPNOTSUPP; case AUDIT_GET: case AUDIT_SET: |
b0fed4021 audit: implement ... |
603 604 |
case AUDIT_GET_FEATURE: case AUDIT_SET_FEATURE: |
189009091 audit: remove the... |
605 606 |
case AUDIT_LIST_RULES: case AUDIT_ADD_RULE: |
93315ed6d [PATCH] audit str... |
607 |
case AUDIT_DEL_RULE: |
c2f0c7c35 The attached patc... |
608 |
case AUDIT_SIGNAL_INFO: |
522ed7767 Audit: add TTY in... |
609 610 |
case AUDIT_TTY_GET: case AUDIT_TTY_SET: |
74c3cbe33 [PATCH] audit: wa... |
611 612 |
case AUDIT_TRIM: case AUDIT_MAKE_EQUIV: |
5a3cb3b6c audit: allow user... |
613 614 615 616 |
/* Only support auditd and auditctl in initial pid namespace * for now. */ if ((task_active_pid_ns(current) != &init_pid_ns)) return -EPERM; |
fd7784615 security: remove ... |
617 |
if (!capable(CAP_AUDIT_CONTROL)) |
1da177e4c Linux-2.6.12-rc2 |
618 619 |
err = -EPERM; break; |
05474106a AUDIT: Fix AVC_US... |
620 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
621 622 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
fd7784615 security: remove ... |
623 |
if (!capable(CAP_AUDIT_WRITE)) |
1da177e4c Linux-2.6.12-rc2 |
624 625 626 627 628 629 630 631 |
err = -EPERM; break; default: /* bad msg */ err = -EINVAL; } return err; } |
dc9eb698f audit: stop pushi... |
632 |
static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) |
50397bd1e [AUDIT] clean up ... |
633 634 |
{ int rc = 0; |
dc9eb698f audit: stop pushi... |
635 |
uid_t uid = from_kuid(&init_user_ns, current_uid()); |
f1dc4867f audit: anchor all... |
636 |
pid_t pid = task_tgid_nr(current); |
50397bd1e [AUDIT] clean up ... |
637 |
|
0868a5e15 audit: printk USE... |
638 |
if (!audit_enabled && msg_type != AUDIT_USER_AVC) { |
50397bd1e [AUDIT] clean up ... |
639 640 641 642 643 |
*ab = NULL; return rc; } *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); |
0644ec0cc audit: catch poss... |
644 645 |
if (unlikely(!*ab)) return rc; |
f1dc4867f audit: anchor all... |
646 |
audit_log_format(*ab, "pid=%d uid=%u", pid, uid); |
4d3fb709b helper for some s... |
647 |
audit_log_session_info(*ab); |
b122c3767 audit: use a cons... |
648 |
audit_log_task_context(*ab); |
50397bd1e [AUDIT] clean up ... |
649 650 651 |
return rc; } |
b0fed4021 audit: implement ... |
652 653 654 655 656 657 658 659 660 661 662 |
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; |
6f285b19d audit: Send repli... |
663 |
audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af)); |
b0fed4021 audit: implement ... |
664 665 666 667 668 669 670 671 |
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... |
672 673 |
if (audit_enabled == AUDIT_OFF) return; |
b0fed4021 audit: implement ... |
674 |
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE); |
ad2ac2632 audit: log task i... |
675 |
audit_log_task_info(ab, current); |
3e1d0bb62 audit: Convert in... |
676 |
audit_log_format(ab, "feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d", |
b0fed4021 audit: implement ... |
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 |
audit_feature_names[which], !!old_feature, !!new_feature, !!old_lock, !!new_lock, res); audit_log_end(ab); } static int audit_set_feature(struct sk_buff *skb) { struct audit_features *uaf; int i; BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0])); uaf = nlmsg_data(nlmsg_hdr(skb)); /* 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... |
706 |
if (old_lock && (new_feature != old_feature)) { |
b0fed4021 audit: implement ... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 |
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; } |
1da177e4c Linux-2.6.12-rc2 |
739 740 |
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { |
dc9eb698f audit: stop pushi... |
741 |
u32 seq; |
1da177e4c Linux-2.6.12-rc2 |
742 |
void *data; |
1da177e4c Linux-2.6.12-rc2 |
743 |
int err; |
c04049939 AUDIT: Add messag... |
744 |
struct audit_buffer *ab; |
1da177e4c Linux-2.6.12-rc2 |
745 |
u16 msg_type = nlh->nlmsg_type; |
e1396065e [PATCH] collect s... |
746 |
struct audit_sig_info *sig_data; |
50397bd1e [AUDIT] clean up ... |
747 |
char *ctx = NULL; |
e1396065e [PATCH] collect s... |
748 |
u32 len; |
1da177e4c Linux-2.6.12-rc2 |
749 |
|
c7bdb545d [NETLINK]: Encaps... |
750 |
err = audit_netlink_ok(skb, msg_type); |
1da177e4c Linux-2.6.12-rc2 |
751 752 |
if (err) return err; |
b0dd25a82 [PATCH] AUDIT: ke... |
753 754 |
/* As soon as there's any sign of userspace auditd, * start kauditd to talk to it */ |
13f51e1c3 audit: don't chec... |
755 |
if (!kauditd_task) { |
b7d112581 AUDIT: Send netli... |
756 |
kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); |
13f51e1c3 audit: don't chec... |
757 758 759 760 761 |
if (IS_ERR(kauditd_task)) { err = PTR_ERR(kauditd_task); kauditd_task = NULL; return err; } |
b7d112581 AUDIT: Send netli... |
762 |
} |
1da177e4c Linux-2.6.12-rc2 |
763 |
seq = nlh->nlmsg_seq; |
c64e66c67 audit: netlink: M... |
764 |
data = nlmsg_data(nlh); |
1da177e4c Linux-2.6.12-rc2 |
765 766 |
switch (msg_type) { |
09f883a90 audit: clean up A... |
767 768 769 770 771 772 773 774 775 776 |
case AUDIT_GET: { struct audit_status s; memset(&s, 0, sizeof(s)); s.enabled = audit_enabled; s.failure = audit_failure; s.pid = audit_pid; s.rate_limit = audit_rate_limit; s.backlog_limit = audit_backlog_limit; s.lost = atomic_read(&audit_lost); s.backlog = skb_queue_len(&audit_skb_queue); |
70249a9cf audit: use define... |
777 |
s.version = AUDIT_VERSION_LATEST; |
51cc83f02 audit: add audit_... |
778 |
s.backlog_wait_time = audit_backlog_wait_time; |
6f285b19d audit: Send repli... |
779 |
audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s)); |
1da177e4c Linux-2.6.12-rc2 |
780 |
break; |
09f883a90 audit: clean up A... |
781 782 783 784 785 786 787 788 |
} case AUDIT_SET: { struct audit_status s; memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); if (s.mask & AUDIT_STATUS_ENABLED) { err = audit_set_enabled(s.enabled); |
20c6aaa39 [PATCH] Fix the b... |
789 790 |
if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
791 |
} |
09f883a90 audit: clean up A... |
792 793 |
if (s.mask & AUDIT_STATUS_FAILURE) { err = audit_set_failure(s.failure); |
20c6aaa39 [PATCH] Fix the b... |
794 795 |
if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
796 |
} |
09f883a90 audit: clean up A... |
797 798 |
if (s.mask & AUDIT_STATUS_PID) { int new_pid = s.pid; |
1a6b9f231 [AUDIT] make audi... |
799 |
|
34eab0a7c audit: prevent an... |
800 801 |
if ((!new_pid) && (task_tgid_vnr(current) != audit_pid)) return -EACCES; |
1a6b9f231 [AUDIT] make audi... |
802 |
if (audit_enabled != AUDIT_OFF) |
dc9eb698f audit: stop pushi... |
803 |
audit_log_config_change("audit_pid", new_pid, audit_pid, 1); |
1a6b9f231 [AUDIT] make audi... |
804 |
audit_pid = new_pid; |
15e473046 netlink: Rename p... |
805 |
audit_nlk_portid = NETLINK_CB(skb).portid; |
de92fc97e audit: fix incorr... |
806 |
audit_sock = skb->sk; |
1da177e4c Linux-2.6.12-rc2 |
807 |
} |
09f883a90 audit: clean up A... |
808 809 |
if (s.mask & AUDIT_STATUS_RATE_LIMIT) { err = audit_set_rate_limit(s.rate_limit); |
20c6aaa39 [PATCH] Fix the b... |
810 811 812 |
if (err < 0) return err; } |
51cc83f02 audit: add audit_... |
813 |
if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) { |
09f883a90 audit: clean up A... |
814 |
err = audit_set_backlog_limit(s.backlog_limit); |
51cc83f02 audit: add audit_... |
815 816 817 |
if (err < 0) return err; } |
3f0c5fad8 audit: remove nee... |
818 819 820 821 822 823 824 825 826 |
if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) { if (sizeof(s) > (size_t)nlh->nlmsg_len) return -EINVAL; if (s.backlog_wait_time < 0 || s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME) return -EINVAL; err = audit_set_backlog_wait_time(s.backlog_wait_time); if (err < 0) return err; |
51cc83f02 audit: add audit_... |
827 |
} |
1da177e4c Linux-2.6.12-rc2 |
828 |
break; |
09f883a90 audit: clean up A... |
829 |
} |
b0fed4021 audit: implement ... |
830 831 832 833 834 835 836 837 838 839 |
case AUDIT_GET_FEATURE: err = audit_get_feature(skb); if (err) return err; break; case AUDIT_SET_FEATURE: err = audit_set_feature(skb); if (err) return err; break; |
05474106a AUDIT: Fix AVC_US... |
840 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
841 842 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
4a4cd633b AUDIT: Optimise t... |
843 844 |
if (!audit_enabled && msg_type != AUDIT_USER_AVC) return 0; |
62062cf8a audit: allow chec... |
845 |
err = audit_filter_user(msg_type); |
724e4fcc8 audit: log on err... |
846 |
if (err == 1) { /* match or error */ |
4a4cd633b AUDIT: Optimise t... |
847 |
err = 0; |
522ed7767 Audit: add TTY in... |
848 |
if (msg_type == AUDIT_USER_TTY) { |
152f497b9 audit: push login... |
849 |
err = tty_audit_push_current(); |
522ed7767 Audit: add TTY in... |
850 851 852 |
if (err) break; } |
1b7b533f6 audit: drop audit... |
853 |
mutex_unlock(&audit_cmd_mutex); |
dc9eb698f audit: stop pushi... |
854 |
audit_log_common_recv_msg(&ab, msg_type); |
50397bd1e [AUDIT] clean up ... |
855 |
if (msg_type != AUDIT_USER_TTY) |
b50eba7e2 audit: format use... |
856 857 |
audit_log_format(ab, " msg='%.*s'", AUDIT_MESSAGE_TEXT_MAX, |
50397bd1e [AUDIT] clean up ... |
858 859 860 |
(char *)data); else { int size; |
f7616102d audit: use data= ... |
861 |
audit_log_format(ab, " data="); |
50397bd1e [AUDIT] clean up ... |
862 |
size = nlmsg_len(nlh); |
55ad2f8d3 audit: ignore ter... |
863 864 865 |
if (size > 0 && ((unsigned char *)data)[size - 1] == '\0') size--; |
b556f8ad5 Audit: standardiz... |
866 |
audit_log_n_untrustedstring(ab, data, size); |
4a4cd633b AUDIT: Optimise t... |
867 |
} |
f9441639e audit: fix netlin... |
868 |
audit_set_portid(ab, NETLINK_CB(skb).portid); |
50397bd1e [AUDIT] clean up ... |
869 |
audit_log_end(ab); |
1b7b533f6 audit: drop audit... |
870 |
mutex_lock(&audit_cmd_mutex); |
0f45aa18e AUDIT: Allow filt... |
871 |
} |
1da177e4c Linux-2.6.12-rc2 |
872 |
break; |
93315ed6d [PATCH] audit str... |
873 874 875 876 |
case AUDIT_ADD_RULE: case AUDIT_DEL_RULE: if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) return -EINVAL; |
1a6b9f231 [AUDIT] make audi... |
877 |
if (audit_enabled == AUDIT_LOCKED) { |
dc9eb698f audit: stop pushi... |
878 879 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); |
50397bd1e [AUDIT] clean up ... |
880 |
audit_log_end(ab); |
6a01b07fa [PATCH] audit con... |
881 882 |
return -EPERM; } |
ce0d9f046 audit: refactor a... |
883 |
err = audit_rule_change(msg_type, NETLINK_CB(skb).portid, |
dc9eb698f audit: stop pushi... |
884 |
seq, data, nlmsg_len(nlh)); |
1da177e4c Linux-2.6.12-rc2 |
885 |
break; |
ce0d9f046 audit: refactor a... |
886 |
case AUDIT_LIST_RULES: |
6f285b19d audit: Send repli... |
887 |
err = audit_list_rules_send(skb, seq); |
ce0d9f046 audit: refactor a... |
888 |
break; |
74c3cbe33 [PATCH] audit: wa... |
889 890 |
case AUDIT_TRIM: audit_trim_trees(); |
dc9eb698f audit: stop pushi... |
891 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
74c3cbe33 [PATCH] audit: wa... |
892 893 894 895 896 897 |
audit_log_format(ab, " op=trim res=1"); audit_log_end(ab); break; case AUDIT_MAKE_EQUIV: { void *bufp = data; u32 sizes[2]; |
7719e437f [PATCH 2/2] audit... |
898 |
size_t msglen = nlmsg_len(nlh); |
74c3cbe33 [PATCH] audit: wa... |
899 900 901 |
char *old, *new; err = -EINVAL; |
7719e437f [PATCH 2/2] audit... |
902 |
if (msglen < 2 * sizeof(u32)) |
74c3cbe33 [PATCH] audit: wa... |
903 904 905 |
break; memcpy(sizes, bufp, 2 * sizeof(u32)); bufp += 2 * sizeof(u32); |
7719e437f [PATCH 2/2] audit... |
906 907 |
msglen -= 2 * sizeof(u32); old = audit_unpack_string(&bufp, &msglen, sizes[0]); |
74c3cbe33 [PATCH] audit: wa... |
908 909 910 911 |
if (IS_ERR(old)) { err = PTR_ERR(old); break; } |
7719e437f [PATCH 2/2] audit... |
912 |
new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
74c3cbe33 [PATCH] audit: wa... |
913 914 915 916 917 918 919 |
if (IS_ERR(new)) { err = PTR_ERR(new); kfree(old); break; } /* OK, here comes... */ err = audit_tag_tree(old, new); |
dc9eb698f audit: stop pushi... |
920 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
50397bd1e [AUDIT] clean up ... |
921 |
|
74c3cbe33 [PATCH] audit: wa... |
922 923 924 925 926 927 928 929 930 931 |
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... |
932 |
case AUDIT_SIGNAL_INFO: |
939cbf260 Audit: send signa... |
933 934 935 936 937 938 |
len = 0; if (audit_sig_sid) { err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); if (err) return err; } |
e1396065e [PATCH] collect s... |
939 940 |
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { |
939cbf260 Audit: send signa... |
941 942 |
if (audit_sig_sid) security_release_secctx(ctx, len); |
e1396065e [PATCH] collect s... |
943 944 |
return -ENOMEM; } |
cca080d9b userns: Convert a... |
945 |
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
e1396065e [PATCH] collect s... |
946 |
sig_data->pid = audit_sig_pid; |
939cbf260 Audit: send signa... |
947 948 949 950 |
if (audit_sig_sid) { memcpy(sig_data->ctx, ctx, len); security_release_secctx(ctx, len); } |
6f285b19d audit: Send repli... |
951 952 |
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, sig_data, sizeof(*sig_data) + len); |
e1396065e [PATCH] collect s... |
953 |
kfree(sig_data); |
c2f0c7c35 The attached patc... |
954 |
break; |
522ed7767 Audit: add TTY in... |
955 956 |
case AUDIT_TTY_GET: { struct audit_tty_status s; |
8aa14b649 audit: Simply AUD... |
957 |
struct task_struct *tsk = current; |
7173c54e3 audit: use spin_l... |
958 |
spin_lock(&tsk->sighand->siglock); |
b95d77fe3 audit: use given ... |
959 |
s.enabled = tsk->signal->audit_tty; |
46e959ea2 audit: add an opt... |
960 |
s.log_passwd = tsk->signal->audit_tty_log_passwd; |
7173c54e3 audit: use spin_l... |
961 |
spin_unlock(&tsk->sighand->siglock); |
8aa14b649 audit: Simply AUD... |
962 |
|
6f285b19d audit: Send repli... |
963 |
audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
522ed7767 Audit: add TTY in... |
964 965 966 |
break; } case AUDIT_TTY_SET: { |
a06e56b2a audit: log AUDIT_... |
967 |
struct audit_tty_status s, old; |
8aa14b649 audit: Simply AUD... |
968 |
struct task_struct *tsk = current; |
a06e56b2a audit: log AUDIT_... |
969 |
struct audit_buffer *ab; |
0e23bacca audit: rework AUD... |
970 971 972 973 974 975 976 977 |
memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); /* 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_... |
978 979 980 981 |
spin_lock(&tsk->sighand->siglock); old.enabled = tsk->signal->audit_tty; old.log_passwd = tsk->signal->audit_tty_log_passwd; |
0e23bacca audit: rework AUD... |
982 983 984 985 |
if (!err) { tsk->signal->audit_tty = s.enabled; tsk->signal->audit_tty_log_passwd = s.log_passwd; } |
a06e56b2a audit: log AUDIT_... |
986 |
spin_unlock(&tsk->sighand->siglock); |
522ed7767 Audit: add TTY in... |
987 |
|
a06e56b2a audit: log AUDIT_... |
988 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
1ce319f11 audit: reorder AU... |
989 990 991 992 |
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_... |
993 |
audit_log_end(ab); |
522ed7767 Audit: add TTY in... |
994 995 |
break; } |
1da177e4c Linux-2.6.12-rc2 |
996 997 998 999 1000 1001 1002 |
default: err = -EINVAL; break; } return err < 0 ? err : 0; } |
b0dd25a82 [PATCH] AUDIT: ke... |
1003 |
/* |
ea7ae60bf Audit: clean up a... |
1004 1005 |
* Get message from skb. Each message is processed by audit_receive_msg. * Malformed skbs with wrong length are discarded silently. |
b0dd25a82 [PATCH] AUDIT: ke... |
1006 |
*/ |
2a0a6ebee [NETLINK]: Synchr... |
1007 |
static void audit_receive_skb(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
1008 |
{ |
ea7ae60bf Audit: clean up a... |
1009 1010 |
struct nlmsghdr *nlh; /* |
941912133 audit: replace ob... |
1011 |
* len MUST be signed for nlmsg_next to be able to dec it below 0 |
ea7ae60bf Audit: clean up a... |
1012 1013 1014 1015 1016 1017 1018 |
* if the nlmsg_len was not aligned */ int len; int err; nlh = nlmsg_hdr(skb); len = skb->len; |
941912133 audit: replace ob... |
1019 |
while (nlmsg_ok(nlh, len)) { |
ea7ae60bf Audit: clean up a... |
1020 1021 1022 |
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)) |
1da177e4c Linux-2.6.12-rc2 |
1023 |
netlink_ack(skb, nlh, err); |
ea7ae60bf Audit: clean up a... |
1024 |
|
2851da570 audit: pass int* ... |
1025 |
nlh = nlmsg_next(nlh, &len); |
1da177e4c Linux-2.6.12-rc2 |
1026 |
} |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 1029 |
} /* Receive messages from netlink socket. */ |
cd40b7d39 [NET]: make netli... |
1030 |
static void audit_receive(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
1031 |
{ |
f368c07d7 [PATCH] audit: pa... |
1032 |
mutex_lock(&audit_cmd_mutex); |
cd40b7d39 [NET]: make netli... |
1033 |
audit_receive_skb(skb); |
f368c07d7 [PATCH] audit: pa... |
1034 |
mutex_unlock(&audit_cmd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1035 |
} |
33faba7fa audit: listen in ... |
1036 |
static int __net_init audit_net_init(struct net *net) |
1da177e4c Linux-2.6.12-rc2 |
1037 |
{ |
a31f2d17b netlink: add netl... |
1038 1039 1040 |
struct netlink_kernel_cfg cfg = { .input = audit_receive, }; |
f368c07d7 [PATCH] audit: pa... |
1041 |
|
33faba7fa audit: listen in ... |
1042 |
struct audit_net *aunet = net_generic(net, audit_net_id); |
33faba7fa audit: listen in ... |
1043 |
aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); |
11ee39ebf audit: print erro... |
1044 |
if (aunet->nlsk == NULL) { |
33faba7fa audit: listen in ... |
1045 |
audit_panic("cannot initialize netlink socket in namespace"); |
11ee39ebf audit: print erro... |
1046 1047 1048 |
return -ENOMEM; } aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
33faba7fa audit: listen in ... |
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
return 0; } static void __net_exit audit_net_exit(struct net *net) { struct audit_net *aunet = net_generic(net, audit_net_id); struct sock *sock = aunet->nlsk; if (sock == audit_sock) { audit_pid = 0; audit_sock = NULL; } |
e231d54c1 kernel: Use RCU_I... |
1060 |
RCU_INIT_POINTER(aunet->nlsk, NULL); |
33faba7fa audit: listen in ... |
1061 1062 1063 |
synchronize_net(); netlink_kernel_release(sock); } |
8626877b5 audit: fix locati... |
1064 |
static struct pernet_operations audit_net_ops __net_initdata = { |
33faba7fa audit: listen in ... |
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 |
.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... |
1075 1076 |
if (audit_initialized == AUDIT_DISABLED) return 0; |
d957f7b72 audit: Use more c... |
1077 1078 1079 |
pr_info("initializing netlink subsys (%s) ", audit_default ? "enabled" : "disabled"); |
33faba7fa audit: listen in ... |
1080 |
register_pernet_subsys(&audit_net_ops); |
1da177e4c Linux-2.6.12-rc2 |
1081 |
|
b7d112581 AUDIT: Send netli... |
1082 |
skb_queue_head_init(&audit_skb_queue); |
f3d357b09 Audit: save audit... |
1083 |
skb_queue_head_init(&audit_skb_hold_queue); |
a3f07114e [PATCH] Audit: ma... |
1084 |
audit_initialized = AUDIT_INITIALIZED; |
1da177e4c Linux-2.6.12-rc2 |
1085 |
audit_enabled = audit_default; |
b593d384e [AUDIT] create co... |
1086 |
audit_ever_enabled |= !!audit_default; |
3dc7e3153 [PATCH] support f... |
1087 |
|
9ad9ad385 AUDIT: Wait for b... |
1088 |
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
f368c07d7 [PATCH] audit: pa... |
1089 |
|
f368c07d7 [PATCH] audit: pa... |
1090 1091 |
for (i = 0; i < AUDIT_INODE_BUCKETS; i++) INIT_LIST_HEAD(&audit_inode_hash[i]); |
f368c07d7 [PATCH] audit: pa... |
1092 |
|
1da177e4c Linux-2.6.12-rc2 |
1093 1094 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 |
__initcall(audit_init); /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ static int __init audit_enable(char *str) { audit_default = !!simple_strtol(str, NULL, 0); |
a3f07114e [PATCH] Audit: ma... |
1101 1102 |
if (!audit_default) audit_initialized = AUDIT_DISABLED; |
d957f7b72 audit: Use more c... |
1103 1104 |
pr_info("%s ", audit_default ? |
d3ca0344b audit: remove use... |
1105 |
"enabled (after initialization)" : "disabled (until reboot)"); |
a3f07114e [PATCH] Audit: ma... |
1106 |
|
9b41046cd [PATCH] Don't pas... |
1107 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
1108 |
} |
1da177e4c Linux-2.6.12-rc2 |
1109 |
__setup("audit=", audit_enable); |
f910fde73 audit: add kernel... |
1110 1111 1112 1113 |
/* 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... |
1114 |
u32 audit_backlog_limit_arg; |
d957f7b72 audit: Use more c... |
1115 |
|
f910fde73 audit: add kernel... |
1116 |
pr_info("audit_backlog_limit: "); |
3e1d0bb62 audit: Convert in... |
1117 1118 1119 |
if (kstrtouint(str, 0, &audit_backlog_limit_arg)) { pr_cont("using default of %u, unable to parse %s ", |
d957f7b72 audit: Use more c... |
1120 |
audit_backlog_limit, str); |
f910fde73 audit: add kernel... |
1121 1122 |
return 1; } |
3e1d0bb62 audit: Convert in... |
1123 1124 |
audit_backlog_limit = audit_backlog_limit_arg; |
d957f7b72 audit: Use more c... |
1125 1126 |
pr_cont("%d ", audit_backlog_limit); |
f910fde73 audit: add kernel... |
1127 1128 1129 1130 |
return 1; } __setup("audit_backlog_limit=", audit_backlog_limit_set); |
16e1904e6 AUDIT: Add helper... |
1131 1132 1133 |
static void audit_buffer_free(struct audit_buffer *ab) { unsigned long flags; |
8fc6115c2 AUDIT: expand aud... |
1134 1135 |
if (!ab) return; |
5ac52f33b AUDIT: buffer aud... |
1136 1137 |
if (ab->skb) kfree_skb(ab->skb); |
b7d112581 AUDIT: Send netli... |
1138 |
|
16e1904e6 AUDIT: Add helper... |
1139 |
spin_lock_irqsave(&audit_freelist_lock, flags); |
5d136a010 [PATCH] minor aud... |
1140 |
if (audit_freelist_count > AUDIT_MAXFREE) |
16e1904e6 AUDIT: Add helper... |
1141 |
kfree(ab); |
5d136a010 [PATCH] minor aud... |
1142 1143 |
else { audit_freelist_count++; |
16e1904e6 AUDIT: Add helper... |
1144 |
list_add(&ab->list, &audit_freelist); |
5d136a010 [PATCH] minor aud... |
1145 |
} |
16e1904e6 AUDIT: Add helper... |
1146 1147 |
spin_unlock_irqrestore(&audit_freelist_lock, flags); } |
c04049939 AUDIT: Add messag... |
1148 |
static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
dd0fc66fb [PATCH] gfp flags... |
1149 |
gfp_t gfp_mask, int type) |
16e1904e6 AUDIT: Add helper... |
1150 1151 1152 |
{ unsigned long flags; struct audit_buffer *ab = NULL; |
c04049939 AUDIT: Add messag... |
1153 |
struct nlmsghdr *nlh; |
16e1904e6 AUDIT: Add helper... |
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 |
spin_lock_irqsave(&audit_freelist_lock, flags); if (!list_empty(&audit_freelist)) { ab = list_entry(audit_freelist.next, struct audit_buffer, list); list_del(&ab->list); --audit_freelist_count; } spin_unlock_irqrestore(&audit_freelist_lock, flags); if (!ab) { |
4332bdd33 AUDIT: Honour gfp... |
1165 |
ab = kmalloc(sizeof(*ab), gfp_mask); |
16e1904e6 AUDIT: Add helper... |
1166 |
if (!ab) |
8fc6115c2 AUDIT: expand aud... |
1167 |
goto err; |
16e1904e6 AUDIT: Add helper... |
1168 |
} |
8fc6115c2 AUDIT: expand aud... |
1169 |
|
b7d112581 AUDIT: Send netli... |
1170 |
ab->ctx = ctx; |
9ad9ad385 AUDIT: Wait for b... |
1171 |
ab->gfp_mask = gfp_mask; |
ee080e6ce Audit: cleanup ne... |
1172 1173 1174 |
ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); if (!ab->skb) |
c64e66c67 audit: netlink: M... |
1175 |
goto err; |
ee080e6ce Audit: cleanup ne... |
1176 |
|
c64e66c67 audit: netlink: M... |
1177 1178 1179 |
nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); if (!nlh) goto out_kfree_skb; |
ee080e6ce Audit: cleanup ne... |
1180 |
|
16e1904e6 AUDIT: Add helper... |
1181 |
return ab; |
ee080e6ce Audit: cleanup ne... |
1182 |
|
c64e66c67 audit: netlink: M... |
1183 |
out_kfree_skb: |
ee080e6ce Audit: cleanup ne... |
1184 1185 |
kfree_skb(ab->skb); ab->skb = NULL; |
8fc6115c2 AUDIT: expand aud... |
1186 1187 1188 |
err: audit_buffer_free(ab); return NULL; |
16e1904e6 AUDIT: Add helper... |
1189 |
} |
1da177e4c Linux-2.6.12-rc2 |
1190 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
1191 1192 1193 1194 |
/** * 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... |
1195 1196 1197 1198 1199 1200 1201 |
* 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... |
1202 1203 1204 1205 |
* 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... |
1206 1207 |
* halts). */ |
bfb4496e7 AUDIT: Assign ser... |
1208 1209 |
unsigned int audit_serial(void) { |
34af946a2 [PATCH] spin/rwlo... |
1210 |
static DEFINE_SPINLOCK(serial_lock); |
d5b454f2c AUDIT: Fix livelo... |
1211 1212 1213 1214 |
static unsigned int serial = 0; unsigned long flags; unsigned int ret; |
bfb4496e7 AUDIT: Assign ser... |
1215 |
|
d5b454f2c AUDIT: Fix livelo... |
1216 |
spin_lock_irqsave(&serial_lock, flags); |
bfb4496e7 AUDIT: Assign ser... |
1217 |
do { |
ce625a801 AUDIT: Reduce con... |
1218 1219 |
ret = ++serial; } while (unlikely(!ret)); |
d5b454f2c AUDIT: Fix livelo... |
1220 |
spin_unlock_irqrestore(&serial_lock, flags); |
bfb4496e7 AUDIT: Assign ser... |
1221 |
|
d5b454f2c AUDIT: Fix livelo... |
1222 |
return ret; |
bfb4496e7 AUDIT: Assign ser... |
1223 |
} |
5600b8927 whitespace fixes:... |
1224 |
static inline void audit_get_stamp(struct audit_context *ctx, |
bfb4496e7 AUDIT: Assign ser... |
1225 1226 |
struct timespec *t, unsigned int *serial) { |
48887e63d [PATCH] fix broke... |
1227 |
if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
bfb4496e7 AUDIT: Assign ser... |
1228 1229 1230 1231 |
*t = CURRENT_TIME; *serial = audit_serial(); } } |
829199197 kernel/audit.c: a... |
1232 1233 1234 |
/* * Wait for auditd to drain the queue a little */ |
c81825dd6 audit: wait_for_a... |
1235 |
static long wait_for_auditd(long sleep_time) |
829199197 kernel/audit.c: a... |
1236 1237 |
{ DECLARE_WAITQUEUE(wait, current); |
f000cfdde audit: wait_for_a... |
1238 |
set_current_state(TASK_UNINTERRUPTIBLE); |
7ecf69bf5 audit: efficiency... |
1239 |
add_wait_queue_exclusive(&audit_backlog_wait, &wait); |
829199197 kernel/audit.c: a... |
1240 1241 1242 |
if (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit) |
c81825dd6 audit: wait_for_a... |
1243 |
sleep_time = schedule_timeout(sleep_time); |
829199197 kernel/audit.c: a... |
1244 1245 1246 |
__set_current_state(TASK_RUNNING); remove_wait_queue(&audit_backlog_wait, &wait); |
ae887e0bd audit: make use o... |
1247 |
|
c81825dd6 audit: wait_for_a... |
1248 |
return sleep_time; |
829199197 kernel/audit.c: a... |
1249 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 |
/** * 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... |
1265 |
struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
9ad9ad385 AUDIT: Wait for b... |
1266 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 |
{ struct audit_buffer *ab = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1269 |
struct timespec t; |
ef00be055 [patch 1/2] kerne... |
1270 |
unsigned int uninitialized_var(serial); |
6dd80aba9 audit: audit_log_... |
1271 1272 |
int reserve = 5; /* Allow atomic callers to go up to five entries over the normal backlog limit */ |
ac4cec443 AUDIT: Stop waiti... |
1273 |
unsigned long timeout_start = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
1274 |
|
a3f07114e [PATCH] Audit: ma... |
1275 |
if (audit_initialized != AUDIT_INITIALIZED) |
1da177e4c Linux-2.6.12-rc2 |
1276 |
return NULL; |
c8edc80c8 [PATCH] Exclude m... |
1277 1278 |
if (unlikely(audit_filter_type(type))) return NULL; |
6dd80aba9 audit: audit_log_... |
1279 1280 1281 1282 1283 1284 |
if (gfp_mask & __GFP_WAIT) { if (audit_pid && audit_pid == current->pid) gfp_mask &= ~__GFP_WAIT; else reserve = 0; } |
9ad9ad385 AUDIT: Wait for b... |
1285 1286 1287 |
while (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { |
829199197 kernel/audit.c: a... |
1288 |
if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) { |
c81825dd6 audit: wait_for_a... |
1289 |
long sleep_time; |
9ad9ad385 AUDIT: Wait for b... |
1290 |
|
c81825dd6 audit: wait_for_a... |
1291 1292 |
sleep_time = timeout_start + audit_backlog_wait_time - jiffies; if (sleep_time > 0) { |
ae887e0bd audit: make use o... |
1293 |
sleep_time = wait_for_auditd(sleep_time); |
c81825dd6 audit: wait_for_a... |
1294 |
if (sleep_time > 0) |
ae887e0bd audit: make use o... |
1295 |
continue; |
8ac1c8d5d audit: fix endles... |
1296 |
} |
9ad9ad385 AUDIT: Wait for b... |
1297 |
} |
320f1b1ed [AUDIT] ratelimit... |
1298 |
if (audit_rate_check() && printk_ratelimit()) |
d957f7b72 audit: Use more c... |
1299 1300 1301 1302 |
pr_warn("audit_backlog=%d > audit_backlog_limit=%d ", skb_queue_len(&audit_skb_queue), audit_backlog_limit); |
fb19b4c6a AUDIT: Honour aud... |
1303 |
audit_log_lost("backlog limit exceeded"); |
ac4cec443 AUDIT: Stop waiti... |
1304 1305 |
audit_backlog_wait_time = audit_backlog_wait_overflow; wake_up(&audit_backlog_wait); |
fb19b4c6a AUDIT: Honour aud... |
1306 1307 |
return NULL; } |
e789e561a audit: reset audi... |
1308 |
audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME; |
9ad9ad385 AUDIT: Wait for b... |
1309 |
ab = audit_buffer_alloc(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
1310 1311 1312 1313 |
if (!ab) { audit_log_lost("out of memory in audit_log_start"); return NULL; } |
bfb4496e7 AUDIT: Assign ser... |
1314 |
audit_get_stamp(ab->ctx, &t, &serial); |
197c69c6a Move ifdef CONFIG... |
1315 |
|
1da177e4c Linux-2.6.12-rc2 |
1316 1317 1318 1319 |
audit_log_format(ab, "audit(%lu.%03lu:%u): ", t.tv_sec, t.tv_nsec/1000000, serial); return ab; } |
8fc6115c2 AUDIT: expand aud... |
1320 |
/** |
5ac52f33b AUDIT: buffer aud... |
1321 |
* audit_expand - expand skb in the audit buffer |
8fc6115c2 AUDIT: expand aud... |
1322 |
* @ab: audit_buffer |
b0dd25a82 [PATCH] AUDIT: ke... |
1323 |
* @extra: space to add at tail of the skb |
8fc6115c2 AUDIT: expand aud... |
1324 1325 1326 1327 |
* * Returns 0 (no space) on failed expansion, or available space if * successful. */ |
e3b926b4c AUDIT: pass size ... |
1328 |
static inline int audit_expand(struct audit_buffer *ab, int extra) |
8fc6115c2 AUDIT: expand aud... |
1329 |
{ |
5ac52f33b AUDIT: buffer aud... |
1330 |
struct sk_buff *skb = ab->skb; |
406a1d868 [AUDIT]: Increase... |
1331 1332 1333 |
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... |
1334 1335 |
if (ret < 0) { audit_log_lost("out of memory in audit_expand"); |
8fc6115c2 AUDIT: expand aud... |
1336 |
return 0; |
5ac52f33b AUDIT: buffer aud... |
1337 |
} |
406a1d868 [AUDIT]: Increase... |
1338 1339 1340 |
skb->truesize += newtail - oldtail; return newtail; |
8fc6115c2 AUDIT: expand aud... |
1341 |
} |
1da177e4c Linux-2.6.12-rc2 |
1342 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
1343 1344 |
/* * Format an audit message into the audit buffer. If there isn't enough |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 |
* 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... |
1347 1348 |
* can't format message larger than 1024 bytes, so we don't either. */ |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 1351 1352 |
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, va_list args) { int len, avail; |
5ac52f33b AUDIT: buffer aud... |
1353 |
struct sk_buff *skb; |
eecb0a733 AUDIT: Fix abuse ... |
1354 |
va_list args2; |
1da177e4c Linux-2.6.12-rc2 |
1355 1356 1357 |
if (!ab) return; |
5ac52f33b AUDIT: buffer aud... |
1358 1359 1360 1361 |
BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); if (avail == 0) { |
e3b926b4c AUDIT: pass size ... |
1362 |
avail = audit_expand(ab, AUDIT_BUFSIZ); |
8fc6115c2 AUDIT: expand aud... |
1363 1364 |
if (!avail) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1365 |
} |
eecb0a733 AUDIT: Fix abuse ... |
1366 |
va_copy(args2, args); |
27a884dc3 [SK_BUFF]: Conver... |
1367 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
1da177e4c Linux-2.6.12-rc2 |
1368 1369 1370 1371 |
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... |
1372 1373 |
avail = audit_expand(ab, max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
8fc6115c2 AUDIT: expand aud... |
1374 |
if (!avail) |
a0e86bd42 audit: always fol... |
1375 |
goto out_va_end; |
27a884dc3 [SK_BUFF]: Conver... |
1376 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
1da177e4c Linux-2.6.12-rc2 |
1377 |
} |
168b71739 AUDIT: Clean up l... |
1378 1379 |
if (len > 0) skb_put(skb, len); |
a0e86bd42 audit: always fol... |
1380 1381 |
out_va_end: va_end(args2); |
8fc6115c2 AUDIT: expand aud... |
1382 1383 |
out: return; |
1da177e4c Linux-2.6.12-rc2 |
1384 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1385 1386 1387 1388 1389 1390 1391 1392 |
/** * 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 |
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 |
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... |
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 |
/** * audit_log_hex - convert a buffer to hex and append it to the audit skb * @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... |
1414 |
void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, |
168b71739 AUDIT: Clean up l... |
1415 |
size_t len) |
83c7d0917 AUDIT: Avoid log ... |
1416 |
{ |
168b71739 AUDIT: Clean up l... |
1417 1418 1419 |
int i, avail, new_len; unsigned char *ptr; struct sk_buff *skb; |
168b71739 AUDIT: Clean up l... |
1420 |
|
8ef2d3040 [PATCH] sanity ch... |
1421 1422 |
if (!ab) return; |
168b71739 AUDIT: Clean up l... |
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 |
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 ... |
1434 |
|
27a884dc3 [SK_BUFF]: Conver... |
1435 |
ptr = skb_tail_pointer(skb); |
b8dbc3241 audit: Use hex_by... |
1436 1437 |
for (i = 0; i < len; i++) ptr = hex_byte_pack_upper(ptr, buf[i]); |
168b71739 AUDIT: Clean up l... |
1438 1439 |
*ptr = 0; skb_put(skb, len << 1); /* new string is twice the old string */ |
83c7d0917 AUDIT: Avoid log ... |
1440 |
} |
9c937dcc7 [PATCH] log more ... |
1441 1442 1443 1444 |
/* * Format a string of no more than slen characters into the audit buffer, * enclosed in quote marks. */ |
b556f8ad5 Audit: standardiz... |
1445 1446 |
void audit_log_n_string(struct audit_buffer *ab, const char *string, size_t slen) |
9c937dcc7 [PATCH] log more ... |
1447 1448 1449 1450 |
{ int avail, new_len; unsigned char *ptr; struct sk_buff *skb; |
8ef2d3040 [PATCH] sanity ch... |
1451 1452 |
if (!ab) return; |
9c937dcc7 [PATCH] log more ... |
1453 1454 1455 1456 1457 1458 1459 1460 1461 |
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... |
1462 |
ptr = skb_tail_pointer(skb); |
9c937dcc7 [PATCH] log more ... |
1463 1464 1465 1466 1467 1468 1469 |
*ptr++ = '"'; memcpy(ptr, string, slen); ptr += slen; *ptr++ = '"'; *ptr = 0; skb_put(skb, slen + 2); /* don't include null terminator */ } |
b0dd25a82 [PATCH] AUDIT: ke... |
1470 |
/** |
de6bbd1d3 [AUDIT] break lar... |
1471 |
* audit_string_contains_control - does a string need to be logged in hex |
f706d5d22 audit: silence tw... |
1472 1473 |
* @string: string to be checked * @len: max length of the string to check |
de6bbd1d3 [AUDIT] break lar... |
1474 1475 1476 1477 |
*/ int audit_string_contains_control(const char *string, size_t len) { const unsigned char *p; |
b3897f567 Audit: fix handli... |
1478 |
for (p = string; p < (const unsigned char *)string + len; p++) { |
1d6c9649e kernel/audit.c co... |
1479 |
if (*p == '"' || *p < 0x21 || *p > 0x7e) |
de6bbd1d3 [AUDIT] break lar... |
1480 1481 1482 1483 1484 1485 |
return 1; } return 0; } /** |
522ed7767 Audit: add TTY in... |
1486 |
* audit_log_n_untrustedstring - log a string that may contain random characters |
b0dd25a82 [PATCH] AUDIT: ke... |
1487 |
* @ab: audit_buffer |
f706d5d22 audit: silence tw... |
1488 |
* @len: length of string (not including trailing null) |
b0dd25a82 [PATCH] AUDIT: ke... |
1489 1490 1491 1492 |
* @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... |
1493 |
* or a space. Unescaped strings will start and end with a double quote mark. |
b0dd25a82 [PATCH] AUDIT: ke... |
1494 |
* Strings that are escaped are printed in hex (2 digits per char). |
9c937dcc7 [PATCH] log more ... |
1495 1496 1497 |
* * 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... |
1498 |
*/ |
b556f8ad5 Audit: standardiz... |
1499 1500 |
void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, size_t len) |
83c7d0917 AUDIT: Avoid log ... |
1501 |
{ |
de6bbd1d3 [AUDIT] break lar... |
1502 |
if (audit_string_contains_control(string, len)) |
b556f8ad5 Audit: standardiz... |
1503 |
audit_log_n_hex(ab, string, len); |
de6bbd1d3 [AUDIT] break lar... |
1504 |
else |
b556f8ad5 Audit: standardiz... |
1505 |
audit_log_n_string(ab, string, len); |
83c7d0917 AUDIT: Avoid log ... |
1506 |
} |
9c937dcc7 [PATCH] log more ... |
1507 |
/** |
522ed7767 Audit: add TTY in... |
1508 |
* audit_log_untrustedstring - log a string that may contain random characters |
9c937dcc7 [PATCH] log more ... |
1509 1510 1511 |
* @ab: audit_buffer * @string: string to be logged * |
522ed7767 Audit: add TTY in... |
1512 |
* Same as audit_log_n_untrustedstring(), except that strlen is used to |
9c937dcc7 [PATCH] log more ... |
1513 1514 |
* determine string length. */ |
de6bbd1d3 [AUDIT] break lar... |
1515 |
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
9c937dcc7 [PATCH] log more ... |
1516 |
{ |
b556f8ad5 Audit: standardiz... |
1517 |
audit_log_n_untrustedstring(ab, string, strlen(string)); |
9c937dcc7 [PATCH] log more ... |
1518 |
} |
168b71739 AUDIT: Clean up l... |
1519 |
/* This is a helper-function to print the escaped d_path */ |
1da177e4c Linux-2.6.12-rc2 |
1520 |
void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
66b3fad3f constify path arg... |
1521 |
const struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
1522 |
{ |
44707fdf5 d_path: Use struc... |
1523 |
char *p, *pathname; |
1da177e4c Linux-2.6.12-rc2 |
1524 |
|
8fc6115c2 AUDIT: expand aud... |
1525 |
if (prefix) |
c158a35c8 audit: no leading... |
1526 |
audit_log_format(ab, "%s", prefix); |
1da177e4c Linux-2.6.12-rc2 |
1527 |
|
168b71739 AUDIT: Clean up l... |
1528 |
/* We will allow 11 spaces for ' (deleted)' to be appended */ |
44707fdf5 d_path: Use struc... |
1529 1530 |
pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); if (!pathname) { |
def575434 Audit: remove spa... |
1531 |
audit_log_string(ab, "<no_memory>"); |
168b71739 AUDIT: Clean up l... |
1532 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1533 |
} |
cf28b4863 d_path: Make d_pa... |
1534 |
p = d_path(path, pathname, PATH_MAX+11); |
168b71739 AUDIT: Clean up l... |
1535 1536 |
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ /* FIXME: can we save some information here? */ |
def575434 Audit: remove spa... |
1537 |
audit_log_string(ab, "<too_long>"); |
5600b8927 whitespace fixes:... |
1538 |
} else |
168b71739 AUDIT: Clean up l... |
1539 |
audit_log_untrustedstring(ab, p); |
44707fdf5 d_path: Use struc... |
1540 |
kfree(pathname); |
1da177e4c Linux-2.6.12-rc2 |
1541 |
} |
4d3fb709b helper for some s... |
1542 1543 |
void audit_log_session_info(struct audit_buffer *ab) { |
4440e8548 audit: convert al... |
1544 |
unsigned int sessionid = audit_get_sessionid(current); |
4d3fb709b helper for some s... |
1545 |
uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
b8f89caaf audit: remove new... |
1546 |
audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); |
4d3fb709b helper for some s... |
1547 |
} |
9d9609851 Audit: clean up a... |
1548 1549 1550 1551 1552 1553 1554 1555 |
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 ... |
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 |
void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) { int i; audit_log_format(ab, " %s=", prefix); CAP_FOR_EACH_U32(i) { audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]); } } void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) { kernel_cap_t *perm = &name->fcap.permitted; kernel_cap_t *inh = &name->fcap.inheritable; int log = 0; if (!cap_isclear(*perm)) { audit_log_cap(ab, "cap_fp", perm); log = 1; } if (!cap_isclear(*inh)) { audit_log_cap(ab, "cap_fi", inh); log = 1; } if (log) audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); } static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) { struct cpu_vfs_cap_data caps; int rc; if (!dentry) return 0; rc = get_vfs_caps_from_disk(dentry, &caps); if (rc) return rc; name->fcap.permitted = caps.permitted; name->fcap.inheritable = caps.inheritable; name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; return 0; } /* Copy inode data into an audit_names. */ void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, const struct inode *inode) { name->ino = inode->i_ino; name->dev = inode->i_sb->s_dev; name->mode = inode->i_mode; name->uid = inode->i_uid; name->gid = inode->i_gid; name->rdev = inode->i_rdev; security_inode_getsecid(inode, &name->osid); audit_copy_fcaps(name, dentry); } /** * audit_log_name - produce AUDIT_PATH record from struct audit_names * @context: audit_context for the task * @n: audit_names structure with reportable details * @path: optional path to report instead of audit_names->name * @record_num: record number to report when handling a list of names * @call_panic: optional pointer to int that will be updated if secid fails */ void audit_log_name(struct audit_context *context, struct audit_names *n, struct path *path, int record_num, int *call_panic) { struct audit_buffer *ab; ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); if (!ab) return; audit_log_format(ab, "item=%d", record_num); if (path) audit_log_d_path(ab, " name=", path); else if (n->name) { switch (n->name_len) { case AUDIT_NAME_FULL: /* log the full path */ audit_log_format(ab, " name="); audit_log_untrustedstring(ab, n->name->name); break; case 0: /* name was specified as a relative path and the * directory component is the cwd */ audit_log_d_path(ab, " name=", &context->pwd); break; default: /* log the name's directory component */ audit_log_format(ab, " name="); audit_log_n_untrustedstring(ab, n->name->name, n->name_len); } } else audit_log_format(ab, " name=(null)"); if (n->ino != (unsigned long)-1) { audit_log_format(ab, " inode=%lu" " dev=%02x:%02x mode=%#ho" " ouid=%u ogid=%u rdev=%02x:%02x", n->ino, MAJOR(n->dev), MINOR(n->dev), n->mode, from_kuid(&init_user_ns, n->uid), from_kgid(&init_user_ns, n->gid), MAJOR(n->rdev), MINOR(n->rdev)); } if (n->osid != 0) { char *ctx = NULL; u32 len; if (security_secid_to_secctx( n->osid, &ctx, &len)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; } else { audit_log_format(ab, " obj=%s", ctx); security_release_secctx(ctx, len); } } |
d3aea84a4 audit: log the au... |
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/* log the audit_names record type */ audit_log_format(ab, " nametype="); switch(n->type) { case AUDIT_TYPE_NORMAL: audit_log_format(ab, "NORMAL"); break; case AUDIT_TYPE_PARENT: audit_log_format(ab, "PARENT"); break; case AUDIT_TYPE_CHILD_DELETE: audit_log_format(ab, "DELETE"); break; case AUDIT_TYPE_CHILD_CREATE: audit_log_format(ab, "CREATE"); break; default: audit_log_format(ab, "UNKNOWN"); break; } |
b24a30a73 audit: fix event ... |
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audit_log_fcaps(ab, n); audit_log_end(ab); } 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); void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) { const struct cred *cred; char name[sizeof(tsk->comm)]; struct mm_struct *mm = tsk->mm; char *tty; if (!ab) return; /* tsk == current */ cred = current_cred(); spin_lock_irq(&tsk->sighand->siglock); if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name) tty = tsk->signal->tty->name; else tty = "(none)"; spin_unlock_irq(&tsk->sighand->siglock); audit_log_format(ab, |
c92cdeb45 audit: convert PP... |
1762 |
" ppid=%d pid=%d auid=%u uid=%u gid=%u" |
b24a30a73 audit: fix event ... |
1763 |
" euid=%u suid=%u fsuid=%u" |
2f2ad1013 audit: restore or... |
1764 |
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
c92cdeb45 audit: convert PP... |
1765 |
task_ppid_nr(tsk), |
f1dc4867f audit: anchor all... |
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task_pid_nr(tsk), |
b24a30a73 audit: fix event ... |
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from_kuid(&init_user_ns, audit_get_loginuid(tsk)), 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), |
2f2ad1013 audit: restore or... |
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tty, audit_get_sessionid(tsk)); |
b24a30a73 audit: fix event ... |
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get_task_comm(name, tsk); audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, name); if (mm) { down_read(&mm->mmap_sem); if (mm->exe_file) audit_log_d_path(ab, " exe=", &mm->exe_file->f_path); up_read(&mm->mmap_sem); |
ff235f51a audit: Added exe ... |
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} else audit_log_format(ab, " exe=(null)"); |
b24a30a73 audit: fix event ... |
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audit_log_task_context(ab); } EXPORT_SYMBOL(audit_log_task_info); |
b0dd25a82 [PATCH] AUDIT: ke... |
1792 |
/** |
a51d9eaa4 fs: add link rest... |
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* audit_log_link_denied - report a link restriction denial * @operation: specific link opreation * @link: the path that triggered the restriction */ void audit_log_link_denied(const char *operation, struct path *link) { struct audit_buffer *ab; |
b24a30a73 audit: fix event ... |
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struct audit_names *name; name = kzalloc(sizeof(*name), GFP_NOFS); if (!name) return; |
a51d9eaa4 fs: add link rest... |
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|
b24a30a73 audit: fix event ... |
1806 |
/* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */ |
a51d9eaa4 fs: add link rest... |
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ab = audit_log_start(current->audit_context, GFP_KERNEL, AUDIT_ANOM_LINK); |
d1c7d97ad fs: handle failed... |
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if (!ab) |
b24a30a73 audit: fix event ... |
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goto out; audit_log_format(ab, "op=%s", operation); audit_log_task_info(ab, current); audit_log_format(ab, " res=0"); |
a51d9eaa4 fs: add link rest... |
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audit_log_end(ab); |
b24a30a73 audit: fix event ... |
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/* Generate AUDIT_PATH record with object. */ name->type = AUDIT_TYPE_NORMAL; audit_copy_inode(name, link->dentry, link->dentry->d_inode); audit_log_name(current->audit_context, name, link, 0, NULL); out: kfree(name); |
a51d9eaa4 fs: add link rest... |
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} /** |
b0dd25a82 [PATCH] AUDIT: ke... |
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* audit_log_end - end one audit record * @ab: the audit_buffer * * The netlink_* functions cannot be called inside an irq context, so * the audit buffer is placed on a queue and a tasklet is scheduled to |
1da177e4c Linux-2.6.12-rc2 |
1830 |
* remove them from the queue outside the irq context. May be called in |
b0dd25a82 [PATCH] AUDIT: ke... |
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* any context. */ |
b7d112581 AUDIT: Send netli... |
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void audit_log_end(struct audit_buffer *ab) |
1da177e4c Linux-2.6.12-rc2 |
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{ |
1da177e4c Linux-2.6.12-rc2 |
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if (!ab) return; if (!audit_rate_check()) { audit_log_lost("rate limit exceeded"); } else { |
8d07a67cf [PATCH] drop EOE ... |
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struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
941912133 audit: replace ob... |
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nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN; |
f3d357b09 Audit: save audit... |
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|
b7d112581 AUDIT: Send netli... |
1843 |
if (audit_pid) { |
b7d112581 AUDIT: Send netli... |
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skb_queue_tail(&audit_skb_queue, ab->skb); |
b7d112581 AUDIT: Send netli... |
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wake_up_interruptible(&kauditd_wait); |
f3d357b09 Audit: save audit... |
1846 |
} else { |
038cbcf65 Audit: unify the ... |
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audit_printk_skb(ab->skb); |
b7d112581 AUDIT: Send netli... |
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} |
f3d357b09 Audit: save audit... |
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ab->skb = NULL; |
1da177e4c Linux-2.6.12-rc2 |
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} |
16e1904e6 AUDIT: Add helper... |
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audit_buffer_free(ab); |
1da177e4c Linux-2.6.12-rc2 |
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} |
b0dd25a82 [PATCH] AUDIT: ke... |
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/** * 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:... |
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void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
9ad9ad385 AUDIT: Wait for b... |
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const char *fmt, ...) |
1da177e4c Linux-2.6.12-rc2 |
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{ struct audit_buffer *ab; va_list args; |
9ad9ad385 AUDIT: Wait for b... |
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ab = audit_log_start(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
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if (ab) { va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); audit_log_end(ab); } } |
bf45da97a [PATCH] EXPORT_SY... |
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|
131ad62d8 netfilter: add SE... |
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#ifdef CONFIG_SECURITY /** * audit_log_secctx - Converts and logs SELinux context * @ab: audit_buffer * @secid: security number * * This is a helper function that calls security_secid_to_secctx to convert * secid to secctx and then adds the (converted) SELinux context to the audit * log by calling audit_log_format, thus also preventing leak of internal secid * to userspace. If secid cannot be converted audit_panic is called. */ void audit_log_secctx(struct audit_buffer *ab, u32 secid) { u32 len; char *secctx; if (security_secid_to_secctx(secid, &secctx, &len)) { audit_panic("Cannot convert secid to context"); } else { audit_log_format(ab, " obj=%s", secctx); security_release_secctx(secctx, len); } } EXPORT_SYMBOL(audit_log_secctx); #endif |
bf45da97a [PATCH] EXPORT_SY... |
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EXPORT_SYMBOL(audit_log_start); EXPORT_SYMBOL(audit_log_end); EXPORT_SYMBOL(audit_log_format); EXPORT_SYMBOL(audit_log); |