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kernel/audit.c
36.4 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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*/ #include <linux/init.h> |
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#include <asm/types.h> |
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#include <asm/atomic.h> |
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#include <linux/mm.h> #include <linux/module.h> |
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#include <linux/err.h> #include <linux/kthread.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> #include <linux/netlink.h> |
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#include <linux/inotify.h> |
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#include <linux/freezer.h> |
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#include <linux/tty.h> |
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#include "audit.h" |
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/* No auditing will take place until audit_initialized != 0. * (Initialization happens after skb_init is called.) */ static int audit_initialized; |
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#define AUDIT_OFF 0 #define AUDIT_ON 1 #define AUDIT_LOCKED 2 |
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int audit_enabled; |
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int audit_ever_enabled; |
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/* Default state when kernel boots without any parameters. */ static int audit_default; /* If auditing cannot proceed, audit_failure selects what happens. */ static int audit_failure = AUDIT_FAIL_PRINTK; |
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/* * If audit records are to be written to the netlink socket, audit_pid * contains the pid of the auditd process and audit_nlk_pid contains * the pid to use to send netlink messages to that process. */ |
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int audit_pid; |
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static int audit_nlk_pid; |
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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. */ static int audit_rate_limit; /* Number of outstanding audit_buffers allowed. */ static int audit_backlog_limit = 64; |
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static int audit_backlog_wait_time = 60 * HZ; static int audit_backlog_wait_overflow = 0; |
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|
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/* The identity of the user shutting down the audit system. */ uid_t audit_sig_uid = -1; pid_t audit_sig_pid = -1; |
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u32 audit_sig_sid = 0; |
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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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/* Inotify handle. */ struct inotify_handle *audit_ih; /* 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; 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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|
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/* Serialize requests from userspace. */ static 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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static void audit_set_pid(struct audit_buffer *ab, pid_t pid) { |
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if (ab) { struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); nlh->nlmsg_pid = pid; } |
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} |
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void audit_panic(const char *message) |
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{ switch (audit_failure) { case AUDIT_FAIL_SILENT: break; case AUDIT_FAIL_PRINTK: |
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if (printk_ratelimit()) printk(KERN_ERR "audit: %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()) printk(KERN_WARNING "audit: audit_lost=%d audit_rate_limit=%d " "audit_backlog_limit=%d ", 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, int new, int old, uid_t loginuid, u32 sid, 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); audit_log_format(ab, "%s=%d old=%d by auid=%u", function_name, new, old, loginuid); |
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if (sid) { char *ctx = NULL; u32 len; |
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rc = security_secid_to_secctx(sid, &ctx, &len); |
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if (rc) { audit_log_format(ab, " sid=%u", sid); allow_changes = 0; /* Something weird, deny request */ } else { audit_log_format(ab, " subj=%s", ctx); |
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security_release_secctx(ctx, len); |
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} |
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} |
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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, int *to_change, int new, uid_t loginuid, u32 sid) |
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{ |
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int allow_changes, rc = 0, 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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if (audit_enabled != AUDIT_OFF) { rc = audit_log_config_change(function_name, new, old, loginuid, sid, allow_changes); 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(int limit, uid_t loginuid, u32 sid) |
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{ |
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return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit, loginuid, sid); } |
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static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sid) { return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit, loginuid, sid); } |
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static int audit_set_enabled(int state, uid_t loginuid, u32 sid) { |
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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, loginuid, sid); if (!rc) audit_ever_enabled |= !!state; return rc; |
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} |
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static int audit_set_failure(int state, uid_t loginuid, u32 sid) |
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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, loginuid, sid); |
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} |
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static int kauditd_thread(void *dummy) |
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{ struct sk_buff *skb; |
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set_freezable(); |
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while (!kthread_should_stop()) { |
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skb = skb_dequeue(&audit_skb_queue); |
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wake_up(&audit_backlog_wait); |
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if (skb) { if (audit_pid) { |
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int err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0); |
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if (err < 0) { BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */ printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d ", audit_pid); |
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audit_log_lost("auditd dissapeared "); |
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audit_pid = 0; } } else { |
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if (printk_ratelimit()) printk(KERN_NOTICE "%s ", skb->data + NLMSG_SPACE(0)); else audit_log_lost("printk limit exceeded "); |
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kfree_skb(skb); } } else { DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&kauditd_wait, &wait); |
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if (!skb_queue_len(&audit_skb_queue)) { try_to_freeze(); |
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schedule(); |
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} |
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__set_current_state(TASK_RUNNING); remove_wait_queue(&kauditd_wait, &wait); } } |
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return 0; |
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} |
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static int audit_prepare_user_tty(pid_t pid, uid_t loginuid) { struct task_struct *tsk; int err; read_lock(&tasklist_lock); tsk = find_task_by_pid(pid); err = -ESRCH; if (!tsk) goto out; err = 0; spin_lock_irq(&tsk->sighand->siglock); if (!tsk->signal->audit_tty) err = -EPERM; spin_unlock_irq(&tsk->sighand->siglock); if (err) goto out; tty_audit_push_task(tsk, loginuid); out: read_unlock(&tasklist_lock); return err; } |
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int audit_send_list(void *_dest) { struct audit_netlink_list *dest = _dest; int pid = dest->pid; struct sk_buff *skb; /* wait for parent to finish and send an ACK */ |
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mutex_lock(&audit_cmd_mutex); mutex_unlock(&audit_cmd_mutex); |
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while ((skb = __skb_dequeue(&dest->q)) != NULL) netlink_unicast(audit_sock, skb, pid, 0); kfree(dest); return 0; } |
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#ifdef CONFIG_AUDIT_TREE static int prune_tree_thread(void *unused) { mutex_lock(&audit_cmd_mutex); audit_prune_trees(); mutex_unlock(&audit_cmd_mutex); return 0; } void audit_schedule_prune(void) { kthread_run(prune_tree_thread, NULL, "audit_prune_tree"); } #endif |
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struct sk_buff *audit_make_reply(int pid, int seq, int type, int done, int multi, void *payload, int size) { struct sk_buff *skb; struct nlmsghdr *nlh; int len = NLMSG_SPACE(size); void *data; int flags = multi ? NLM_F_MULTI : 0; int t = done ? NLMSG_DONE : type; skb = alloc_skb(len, GFP_KERNEL); if (!skb) return NULL; nlh = NLMSG_PUT(skb, pid, seq, t, size); nlh->nlmsg_flags = flags; data = NLMSG_DATA(nlh); memcpy(data, payload, size); return skb; nlmsg_failure: /* Used by NLMSG_PUT */ if (skb) kfree_skb(skb); return NULL; } |
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/** * audit_send_reply - send an audit reply message via netlink * @pid: process id to send reply to * @seq: sequence number * @type: audit message type * @done: done (last) flag * @multi: multi-part message flag * @payload: payload data * @size: payload size * * Allocates an skb, builds the netlink message, and sends it to the pid. * No failure notifications. */ |
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void audit_send_reply(int pid, int seq, int type, int done, int multi, void *payload, int size) { struct sk_buff *skb; |
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skb = audit_make_reply(pid, seq, type, done, multi, payload, size); |
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if (!skb) |
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return; |
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/* Ignore failure. It'll only happen if the sender goes away, because our timeout is set to infinite. */ netlink_unicast(audit_sock, skb, pid, 0); |
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return; |
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} /* * Check for appropriate CAP_AUDIT_ capabilities on incoming audit * control messages. */ |
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static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
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{ int err = 0; switch (msg_type) { case AUDIT_GET: case AUDIT_LIST: |
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case AUDIT_LIST_RULES: |
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case AUDIT_SET: case AUDIT_ADD: |
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case AUDIT_ADD_RULE: |
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case AUDIT_DEL: |
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case AUDIT_DEL_RULE: |
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case AUDIT_SIGNAL_INFO: |
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503 504 |
case AUDIT_TTY_GET: case AUDIT_TTY_SET: |
74c3cbe33 [PATCH] audit: wa... |
505 506 |
case AUDIT_TRIM: case AUDIT_MAKE_EQUIV: |
c7bdb545d [NETLINK]: Encaps... |
507 |
if (security_netlink_recv(skb, CAP_AUDIT_CONTROL)) |
1da177e4c Linux-2.6.12-rc2 |
508 509 |
err = -EPERM; break; |
05474106a AUDIT: Fix AVC_US... |
510 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
511 512 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
c7bdb545d [NETLINK]: Encaps... |
513 |
if (security_netlink_recv(skb, CAP_AUDIT_WRITE)) |
1da177e4c Linux-2.6.12-rc2 |
514 515 516 517 518 519 520 521 |
err = -EPERM; break; default: /* bad msg */ err = -EINVAL; } return err; } |
50397bd1e [AUDIT] clean up ... |
522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 |
static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type, u32 pid, u32 uid, uid_t auid, u32 sid) { int rc = 0; char *ctx = NULL; u32 len; if (!audit_enabled) { *ab = NULL; return rc; } *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); audit_log_format(*ab, "user pid=%d uid=%u auid=%u", pid, uid, auid); if (sid) { |
2a862b32f Audit: use new LS... |
538 |
rc = security_secid_to_secctx(sid, &ctx, &len); |
50397bd1e [AUDIT] clean up ... |
539 540 |
if (rc) audit_log_format(*ab, " ssid=%u", sid); |
2a862b32f Audit: use new LS... |
541 |
else { |
50397bd1e [AUDIT] clean up ... |
542 |
audit_log_format(*ab, " subj=%s", ctx); |
2a862b32f Audit: use new LS... |
543 544 |
security_release_secctx(ctx, len); } |
50397bd1e [AUDIT] clean up ... |
545 546 547 548 |
} return rc; } |
1da177e4c Linux-2.6.12-rc2 |
549 550 |
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { |
e7c349701 [PATCH] Reworked ... |
551 |
u32 uid, pid, seq, sid; |
1da177e4c Linux-2.6.12-rc2 |
552 553 554 |
void *data; struct audit_status *status_get, status_set; int err; |
c04049939 AUDIT: Add messag... |
555 |
struct audit_buffer *ab; |
1da177e4c Linux-2.6.12-rc2 |
556 |
u16 msg_type = nlh->nlmsg_type; |
c94c257c8 Add audit uid to ... |
557 |
uid_t loginuid; /* loginuid of sender */ |
e1396065e [PATCH] collect s... |
558 |
struct audit_sig_info *sig_data; |
50397bd1e [AUDIT] clean up ... |
559 |
char *ctx = NULL; |
e1396065e [PATCH] collect s... |
560 |
u32 len; |
1da177e4c Linux-2.6.12-rc2 |
561 |
|
c7bdb545d [NETLINK]: Encaps... |
562 |
err = audit_netlink_ok(skb, msg_type); |
1da177e4c Linux-2.6.12-rc2 |
563 564 |
if (err) return err; |
b0dd25a82 [PATCH] AUDIT: ke... |
565 566 |
/* As soon as there's any sign of userspace auditd, * start kauditd to talk to it */ |
b7d112581 AUDIT: Send netli... |
567 568 569 570 571 572 573 |
if (!kauditd_task) kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); if (IS_ERR(kauditd_task)) { err = PTR_ERR(kauditd_task); kauditd_task = NULL; return err; } |
1da177e4c Linux-2.6.12-rc2 |
574 575 |
pid = NETLINK_CREDS(skb)->pid; uid = NETLINK_CREDS(skb)->uid; |
c94c257c8 Add audit uid to ... |
576 |
loginuid = NETLINK_CB(skb).loginuid; |
e7c349701 [PATCH] Reworked ... |
577 |
sid = NETLINK_CB(skb).sid; |
1da177e4c Linux-2.6.12-rc2 |
578 579 580 581 582 583 584 585 586 587 588 |
seq = nlh->nlmsg_seq; data = NLMSG_DATA(nlh); switch (msg_type) { case AUDIT_GET: status_set.enabled = audit_enabled; status_set.failure = audit_failure; status_set.pid = audit_pid; status_set.rate_limit = audit_rate_limit; status_set.backlog_limit = audit_backlog_limit; status_set.lost = atomic_read(&audit_lost); |
b7d112581 AUDIT: Send netli... |
589 |
status_set.backlog = skb_queue_len(&audit_skb_queue); |
1da177e4c Linux-2.6.12-rc2 |
590 591 592 593 594 595 596 597 |
audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0, &status_set, sizeof(status_set)); break; case AUDIT_SET: if (nlh->nlmsg_len < sizeof(struct audit_status)) return -EINVAL; status_get = (struct audit_status *)data; if (status_get->mask & AUDIT_STATUS_ENABLED) { |
ce29b682e [PATCH] More user... |
598 599 |
err = audit_set_enabled(status_get->enabled, loginuid, sid); |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 |
if (err < 0) return err; } if (status_get->mask & AUDIT_STATUS_FAILURE) { |
ce29b682e [PATCH] More user... |
603 604 |
err = audit_set_failure(status_get->failure, loginuid, sid); |
1da177e4c Linux-2.6.12-rc2 |
605 606 607 |
if (err < 0) return err; } if (status_get->mask & AUDIT_STATUS_PID) { |
1a6b9f231 [AUDIT] make audi... |
608 609 610 611 612 613 614 615 |
int new_pid = status_get->pid; if (audit_enabled != AUDIT_OFF) audit_log_config_change("audit_pid", new_pid, audit_pid, loginuid, sid, 1); audit_pid = new_pid; |
75c0371a2 audit: netlink so... |
616 |
audit_nlk_pid = NETLINK_CB(skb).pid; |
1da177e4c Linux-2.6.12-rc2 |
617 618 |
} if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) |
5d136a010 [PATCH] minor aud... |
619 |
err = audit_set_rate_limit(status_get->rate_limit, |
ce29b682e [PATCH] More user... |
620 |
loginuid, sid); |
1da177e4c Linux-2.6.12-rc2 |
621 |
if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT) |
5d136a010 [PATCH] minor aud... |
622 |
err = audit_set_backlog_limit(status_get->backlog_limit, |
ce29b682e [PATCH] More user... |
623 |
loginuid, sid); |
1da177e4c Linux-2.6.12-rc2 |
624 |
break; |
05474106a AUDIT: Fix AVC_US... |
625 |
case AUDIT_USER: |
039b6b3ed audit: add spaces... |
626 627 |
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
4a4cd633b AUDIT: Optimise t... |
628 629 |
if (!audit_enabled && msg_type != AUDIT_USER_AVC) return 0; |
5bb289b5a AUDIT: Clean up u... |
630 |
err = audit_filter_user(&NETLINK_CB(skb), msg_type); |
4a4cd633b AUDIT: Optimise t... |
631 632 |
if (err == 1) { err = 0; |
522ed7767 Audit: add TTY in... |
633 634 635 636 637 |
if (msg_type == AUDIT_USER_TTY) { err = audit_prepare_user_tty(pid, loginuid); if (err) break; } |
50397bd1e [AUDIT] clean up ... |
638 639 640 641 642 643 644 645 646 647 648 649 650 |
audit_log_common_recv_msg(&ab, msg_type, pid, uid, loginuid, sid); if (msg_type != AUDIT_USER_TTY) audit_log_format(ab, " msg='%.1024s'", (char *)data); else { int size; audit_log_format(ab, " msg="); size = nlmsg_len(nlh); audit_log_n_untrustedstring(ab, size, data); |
4a4cd633b AUDIT: Optimise t... |
651 |
} |
50397bd1e [AUDIT] clean up ... |
652 653 |
audit_set_pid(ab, pid); audit_log_end(ab); |
0f45aa18e AUDIT: Allow filt... |
654 |
} |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 |
break; case AUDIT_ADD: case AUDIT_DEL: |
93315ed6d [PATCH] audit str... |
658 |
if (nlmsg_len(nlh) < sizeof(struct audit_rule)) |
1da177e4c Linux-2.6.12-rc2 |
659 |
return -EINVAL; |
1a6b9f231 [AUDIT] make audi... |
660 |
if (audit_enabled == AUDIT_LOCKED) { |
50397bd1e [AUDIT] clean up ... |
661 662 663 664 665 666 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, uid, loginuid, sid); audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); audit_log_end(ab); |
6a01b07fa [PATCH] audit con... |
667 668 |
return -EPERM; } |
1da177e4c Linux-2.6.12-rc2 |
669 670 |
/* fallthrough */ case AUDIT_LIST: |
1da177e4c Linux-2.6.12-rc2 |
671 |
err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, |
93315ed6d [PATCH] audit str... |
672 |
uid, seq, data, nlmsg_len(nlh), |
ce29b682e [PATCH] More user... |
673 |
loginuid, sid); |
93315ed6d [PATCH] audit str... |
674 675 676 677 678 |
break; case AUDIT_ADD_RULE: case AUDIT_DEL_RULE: if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) return -EINVAL; |
1a6b9f231 [AUDIT] make audi... |
679 |
if (audit_enabled == AUDIT_LOCKED) { |
50397bd1e [AUDIT] clean up ... |
680 681 682 683 684 685 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, uid, loginuid, sid); audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); audit_log_end(ab); |
6a01b07fa [PATCH] audit con... |
686 687 |
return -EPERM; } |
93315ed6d [PATCH] audit str... |
688 689 690 691 |
/* fallthrough */ case AUDIT_LIST_RULES: err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, uid, seq, data, nlmsg_len(nlh), |
ce29b682e [PATCH] More user... |
692 |
loginuid, sid); |
1da177e4c Linux-2.6.12-rc2 |
693 |
break; |
74c3cbe33 [PATCH] audit: wa... |
694 695 |
case AUDIT_TRIM: audit_trim_trees(); |
50397bd1e [AUDIT] clean up ... |
696 697 698 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, uid, loginuid, sid); |
74c3cbe33 [PATCH] audit: wa... |
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 |
audit_log_format(ab, " op=trim res=1"); audit_log_end(ab); break; case AUDIT_MAKE_EQUIV: { void *bufp = data; u32 sizes[2]; size_t len = nlmsg_len(nlh); char *old, *new; err = -EINVAL; if (len < 2 * sizeof(u32)) break; memcpy(sizes, bufp, 2 * sizeof(u32)); bufp += 2 * sizeof(u32); len -= 2 * sizeof(u32); old = audit_unpack_string(&bufp, &len, sizes[0]); if (IS_ERR(old)) { err = PTR_ERR(old); break; } new = audit_unpack_string(&bufp, &len, sizes[1]); if (IS_ERR(new)) { err = PTR_ERR(new); kfree(old); break; } /* OK, here comes... */ err = audit_tag_tree(old, new); |
50397bd1e [AUDIT] clean up ... |
727 728 |
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, uid, loginuid, sid); |
74c3cbe33 [PATCH] audit: wa... |
729 730 731 732 733 734 735 736 737 738 |
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... |
739 |
case AUDIT_SIGNAL_INFO: |
2a862b32f Audit: use new LS... |
740 |
err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); |
e1396065e [PATCH] collect s... |
741 742 743 744 |
if (err) return err; sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { |
2a862b32f Audit: use new LS... |
745 |
security_release_secctx(ctx, len); |
e1396065e [PATCH] collect s... |
746 747 748 749 750 |
return -ENOMEM; } sig_data->uid = audit_sig_uid; sig_data->pid = audit_sig_pid; memcpy(sig_data->ctx, ctx, len); |
2a862b32f Audit: use new LS... |
751 |
security_release_secctx(ctx, len); |
5600b8927 whitespace fixes:... |
752 |
audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO, |
e1396065e [PATCH] collect s... |
753 754 |
0, 0, sig_data, sizeof(*sig_data) + len); kfree(sig_data); |
c2f0c7c35 The attached patc... |
755 |
break; |
522ed7767 Audit: add TTY in... |
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
case AUDIT_TTY_GET: { struct audit_tty_status s; struct task_struct *tsk; read_lock(&tasklist_lock); tsk = find_task_by_pid(pid); if (!tsk) err = -ESRCH; else { spin_lock_irq(&tsk->sighand->siglock); s.enabled = tsk->signal->audit_tty != 0; spin_unlock_irq(&tsk->sighand->siglock); } read_unlock(&tasklist_lock); audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); break; } case AUDIT_TTY_SET: { struct audit_tty_status *s; struct task_struct *tsk; if (nlh->nlmsg_len < sizeof(struct audit_tty_status)) return -EINVAL; s = data; if (s->enabled != 0 && s->enabled != 1) return -EINVAL; read_lock(&tasklist_lock); tsk = find_task_by_pid(pid); if (!tsk) err = -ESRCH; else { spin_lock_irq(&tsk->sighand->siglock); tsk->signal->audit_tty = s->enabled != 0; spin_unlock_irq(&tsk->sighand->siglock); } read_unlock(&tasklist_lock); break; } |
1da177e4c Linux-2.6.12-rc2 |
795 796 797 798 799 800 801 |
default: err = -EINVAL; break; } return err < 0 ? err : 0; } |
b0dd25a82 [PATCH] AUDIT: ke... |
802 803 |
/* * Get message from skb (based on rtnetlink_rcv_skb). Each message is |
1da177e4c Linux-2.6.12-rc2 |
804 |
* processed by audit_receive_msg. Malformed skbs with wrong length are |
b0dd25a82 [PATCH] AUDIT: ke... |
805 806 |
* discarded silently. */ |
2a0a6ebee [NETLINK]: Synchr... |
807 |
static void audit_receive_skb(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
808 809 810 811 812 813 |
{ int err; struct nlmsghdr *nlh; u32 rlen; while (skb->len >= NLMSG_SPACE(0)) { |
b529ccf27 [NETLINK]: Introd... |
814 |
nlh = nlmsg_hdr(skb); |
1da177e4c Linux-2.6.12-rc2 |
815 |
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) |
2a0a6ebee [NETLINK]: Synchr... |
816 |
return; |
1da177e4c Linux-2.6.12-rc2 |
817 818 819 820 821 822 823 824 825 |
rlen = NLMSG_ALIGN(nlh->nlmsg_len); if (rlen > skb->len) rlen = skb->len; if ((err = audit_receive_msg(skb, nlh))) { netlink_ack(skb, nlh, err); } else if (nlh->nlmsg_flags & NLM_F_ACK) netlink_ack(skb, nlh, 0); skb_pull(skb, rlen); } |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 |
} /* Receive messages from netlink socket. */ |
cd40b7d39 [NET]: make netli... |
829 |
static void audit_receive(struct sk_buff *skb) |
1da177e4c Linux-2.6.12-rc2 |
830 |
{ |
f368c07d7 [PATCH] audit: pa... |
831 |
mutex_lock(&audit_cmd_mutex); |
cd40b7d39 [NET]: make netli... |
832 |
audit_receive_skb(skb); |
f368c07d7 [PATCH] audit: pa... |
833 |
mutex_unlock(&audit_cmd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
834 |
} |
f368c07d7 [PATCH] audit: pa... |
835 836 837 838 839 840 |
#ifdef CONFIG_AUDITSYSCALL static const struct inotify_operations audit_inotify_ops = { .handle_event = audit_handle_ievent, .destroy_watch = audit_free_parent, }; #endif |
1da177e4c Linux-2.6.12-rc2 |
841 842 843 844 |
/* Initialize audit support at boot time. */ static int __init audit_init(void) { |
f368c07d7 [PATCH] audit: pa... |
845 |
int i; |
f368c07d7 [PATCH] audit: pa... |
846 |
|
1da177e4c Linux-2.6.12-rc2 |
847 848 849 |
printk(KERN_INFO "audit: initializing netlink socket (%s) ", audit_default ? "enabled" : "disabled"); |
b4b510290 [NET]: Support mu... |
850 851 |
audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0, audit_receive, NULL, THIS_MODULE); |
1da177e4c Linux-2.6.12-rc2 |
852 853 |
if (!audit_sock) audit_panic("cannot initialize netlink socket"); |
71e1c784b [PATCH] fix audit... |
854 855 |
else audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
1da177e4c Linux-2.6.12-rc2 |
856 |
|
b7d112581 AUDIT: Send netli... |
857 |
skb_queue_head_init(&audit_skb_queue); |
1da177e4c Linux-2.6.12-rc2 |
858 859 |
audit_initialized = 1; audit_enabled = audit_default; |
b593d384e [AUDIT] create co... |
860 |
audit_ever_enabled |= !!audit_default; |
3dc7e3153 [PATCH] support f... |
861 |
|
9ad9ad385 AUDIT: Wait for b... |
862 |
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
f368c07d7 [PATCH] audit: pa... |
863 864 865 866 867 |
#ifdef CONFIG_AUDITSYSCALL audit_ih = inotify_init(&audit_inotify_ops); if (IS_ERR(audit_ih)) audit_panic("cannot initialize inotify handle"); |
6988434ee [PATCH] fix oops ... |
868 |
#endif |
f368c07d7 [PATCH] audit: pa... |
869 870 871 |
for (i = 0; i < AUDIT_INODE_BUCKETS; i++) INIT_LIST_HEAD(&audit_inode_hash[i]); |
f368c07d7 [PATCH] audit: pa... |
872 |
|
1da177e4c Linux-2.6.12-rc2 |
873 874 |
return 0; } |
1da177e4c Linux-2.6.12-rc2 |
875 876 877 878 879 880 881 882 883 884 |
__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); printk(KERN_INFO "audit: %s%s ", audit_default ? "enabled" : "disabled", audit_initialized ? "" : " (after initialization)"); |
b593d384e [AUDIT] create co... |
885 |
if (audit_initialized) { |
1da177e4c Linux-2.6.12-rc2 |
886 |
audit_enabled = audit_default; |
b593d384e [AUDIT] create co... |
887 888 |
audit_ever_enabled |= !!audit_default; } |
9b41046cd [PATCH] Don't pas... |
889 |
return 1; |
1da177e4c Linux-2.6.12-rc2 |
890 891 892 |
} __setup("audit=", audit_enable); |
16e1904e6 AUDIT: Add helper... |
893 894 895 |
static void audit_buffer_free(struct audit_buffer *ab) { unsigned long flags; |
8fc6115c2 AUDIT: expand aud... |
896 897 |
if (!ab) return; |
5ac52f33b AUDIT: buffer aud... |
898 899 |
if (ab->skb) kfree_skb(ab->skb); |
b7d112581 AUDIT: Send netli... |
900 |
|
16e1904e6 AUDIT: Add helper... |
901 |
spin_lock_irqsave(&audit_freelist_lock, flags); |
5d136a010 [PATCH] minor aud... |
902 |
if (audit_freelist_count > AUDIT_MAXFREE) |
16e1904e6 AUDIT: Add helper... |
903 |
kfree(ab); |
5d136a010 [PATCH] minor aud... |
904 905 |
else { audit_freelist_count++; |
16e1904e6 AUDIT: Add helper... |
906 |
list_add(&ab->list, &audit_freelist); |
5d136a010 [PATCH] minor aud... |
907 |
} |
16e1904e6 AUDIT: Add helper... |
908 909 |
spin_unlock_irqrestore(&audit_freelist_lock, flags); } |
c04049939 AUDIT: Add messag... |
910 |
static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
dd0fc66fb [PATCH] gfp flags... |
911 |
gfp_t gfp_mask, int type) |
16e1904e6 AUDIT: Add helper... |
912 913 914 |
{ unsigned long flags; struct audit_buffer *ab = NULL; |
c04049939 AUDIT: Add messag... |
915 |
struct nlmsghdr *nlh; |
16e1904e6 AUDIT: Add helper... |
916 917 918 919 920 921 922 923 924 925 926 |
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... |
927 |
ab = kmalloc(sizeof(*ab), gfp_mask); |
16e1904e6 AUDIT: Add helper... |
928 |
if (!ab) |
8fc6115c2 AUDIT: expand aud... |
929 |
goto err; |
16e1904e6 AUDIT: Add helper... |
930 |
} |
8fc6115c2 AUDIT: expand aud... |
931 |
|
4332bdd33 AUDIT: Honour gfp... |
932 |
ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask); |
5ac52f33b AUDIT: buffer aud... |
933 |
if (!ab->skb) |
8fc6115c2 AUDIT: expand aud... |
934 |
goto err; |
b7d112581 AUDIT: Send netli... |
935 |
ab->ctx = ctx; |
9ad9ad385 AUDIT: Wait for b... |
936 |
ab->gfp_mask = gfp_mask; |
c04049939 AUDIT: Add messag... |
937 938 939 940 941 |
nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0)); nlh->nlmsg_type = type; nlh->nlmsg_flags = 0; nlh->nlmsg_pid = 0; nlh->nlmsg_seq = 0; |
16e1904e6 AUDIT: Add helper... |
942 |
return ab; |
8fc6115c2 AUDIT: expand aud... |
943 944 945 |
err: audit_buffer_free(ab); return NULL; |
16e1904e6 AUDIT: Add helper... |
946 |
} |
1da177e4c Linux-2.6.12-rc2 |
947 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
948 949 950 951 |
/** * 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... |
952 953 954 955 956 957 958 |
* 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... |
959 960 961 962 |
* 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... |
963 964 |
* halts). */ |
bfb4496e7 AUDIT: Assign ser... |
965 966 |
unsigned int audit_serial(void) { |
34af946a2 [PATCH] spin/rwlo... |
967 |
static DEFINE_SPINLOCK(serial_lock); |
d5b454f2c AUDIT: Fix livelo... |
968 969 970 971 |
static unsigned int serial = 0; unsigned long flags; unsigned int ret; |
bfb4496e7 AUDIT: Assign ser... |
972 |
|
d5b454f2c AUDIT: Fix livelo... |
973 |
spin_lock_irqsave(&serial_lock, flags); |
bfb4496e7 AUDIT: Assign ser... |
974 |
do { |
ce625a801 AUDIT: Reduce con... |
975 976 |
ret = ++serial; } while (unlikely(!ret)); |
d5b454f2c AUDIT: Fix livelo... |
977 |
spin_unlock_irqrestore(&serial_lock, flags); |
bfb4496e7 AUDIT: Assign ser... |
978 |
|
d5b454f2c AUDIT: Fix livelo... |
979 |
return ret; |
bfb4496e7 AUDIT: Assign ser... |
980 |
} |
5600b8927 whitespace fixes:... |
981 |
static inline void audit_get_stamp(struct audit_context *ctx, |
bfb4496e7 AUDIT: Assign ser... |
982 983 984 985 986 987 988 989 990 |
struct timespec *t, unsigned int *serial) { if (ctx) auditsc_get_stamp(ctx, t, serial); else { *t = CURRENT_TIME; *serial = audit_serial(); } } |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 996 |
/* 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 tsk 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, tsk * should be NULL. */ |
9ad9ad385 AUDIT: Wait for b... |
997 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 |
/** * 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... |
1013 |
struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
9ad9ad385 AUDIT: Wait for b... |
1014 |
int type) |
1da177e4c Linux-2.6.12-rc2 |
1015 1016 |
{ struct audit_buffer *ab = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1017 |
struct timespec t; |
ef00be055 [patch 1/2] kerne... |
1018 |
unsigned int uninitialized_var(serial); |
9ad9ad385 AUDIT: Wait for b... |
1019 |
int reserve; |
ac4cec443 AUDIT: Stop waiti... |
1020 |
unsigned long timeout_start = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
1021 1022 1023 |
if (!audit_initialized) return NULL; |
c8edc80c8 [PATCH] Exclude m... |
1024 1025 |
if (unlikely(audit_filter_type(type))) return NULL; |
9ad9ad385 AUDIT: Wait for b... |
1026 1027 1028 |
if (gfp_mask & __GFP_WAIT) reserve = 0; else |
5600b8927 whitespace fixes:... |
1029 |
reserve = 5; /* Allow atomic callers to go up to five |
9ad9ad385 AUDIT: Wait for b... |
1030 1031 1032 1033 |
entries over the normal backlog limit */ while (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { |
ac4cec443 AUDIT: Stop waiti... |
1034 1035 |
if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time && time_before(jiffies, timeout_start + audit_backlog_wait_time)) { |
9ad9ad385 AUDIT: Wait for b... |
1036 1037 1038 1039 1040 1041 1042 |
/* Wait for auditd to drain the queue a little */ DECLARE_WAITQUEUE(wait, current); set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&audit_backlog_wait, &wait); if (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit) |
ac4cec443 AUDIT: Stop waiti... |
1043 |
schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies); |
9ad9ad385 AUDIT: Wait for b... |
1044 1045 1046 |
__set_current_state(TASK_RUNNING); remove_wait_queue(&audit_backlog_wait, &wait); |
ac4cec443 AUDIT: Stop waiti... |
1047 |
continue; |
9ad9ad385 AUDIT: Wait for b... |
1048 |
} |
320f1b1ed [AUDIT] ratelimit... |
1049 |
if (audit_rate_check() && printk_ratelimit()) |
fb19b4c6a AUDIT: Honour aud... |
1050 1051 1052 1053 1054 1055 1056 |
printk(KERN_WARNING "audit: audit_backlog=%d > " "audit_backlog_limit=%d ", skb_queue_len(&audit_skb_queue), audit_backlog_limit); audit_log_lost("backlog limit exceeded"); |
ac4cec443 AUDIT: Stop waiti... |
1057 1058 |
audit_backlog_wait_time = audit_backlog_wait_overflow; wake_up(&audit_backlog_wait); |
fb19b4c6a AUDIT: Honour aud... |
1059 1060 |
return NULL; } |
9ad9ad385 AUDIT: Wait for b... |
1061 |
ab = audit_buffer_alloc(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 1064 1065 |
if (!ab) { audit_log_lost("out of memory in audit_log_start"); return NULL; } |
bfb4496e7 AUDIT: Assign ser... |
1066 |
audit_get_stamp(ab->ctx, &t, &serial); |
197c69c6a Move ifdef CONFIG... |
1067 |
|
1da177e4c Linux-2.6.12-rc2 |
1068 1069 1070 1071 |
audit_log_format(ab, "audit(%lu.%03lu:%u): ", t.tv_sec, t.tv_nsec/1000000, serial); return ab; } |
8fc6115c2 AUDIT: expand aud... |
1072 |
/** |
5ac52f33b AUDIT: buffer aud... |
1073 |
* audit_expand - expand skb in the audit buffer |
8fc6115c2 AUDIT: expand aud... |
1074 |
* @ab: audit_buffer |
b0dd25a82 [PATCH] AUDIT: ke... |
1075 |
* @extra: space to add at tail of the skb |
8fc6115c2 AUDIT: expand aud... |
1076 1077 1078 1079 |
* * Returns 0 (no space) on failed expansion, or available space if * successful. */ |
e3b926b4c AUDIT: pass size ... |
1080 |
static inline int audit_expand(struct audit_buffer *ab, int extra) |
8fc6115c2 AUDIT: expand aud... |
1081 |
{ |
5ac52f33b AUDIT: buffer aud... |
1082 |
struct sk_buff *skb = ab->skb; |
406a1d868 [AUDIT]: Increase... |
1083 1084 1085 |
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... |
1086 1087 |
if (ret < 0) { audit_log_lost("out of memory in audit_expand"); |
8fc6115c2 AUDIT: expand aud... |
1088 |
return 0; |
5ac52f33b AUDIT: buffer aud... |
1089 |
} |
406a1d868 [AUDIT]: Increase... |
1090 1091 1092 |
skb->truesize += newtail - oldtail; return newtail; |
8fc6115c2 AUDIT: expand aud... |
1093 |
} |
1da177e4c Linux-2.6.12-rc2 |
1094 |
|
b0dd25a82 [PATCH] AUDIT: ke... |
1095 1096 |
/* * Format an audit message into the audit buffer. If there isn't enough |
1da177e4c Linux-2.6.12-rc2 |
1097 1098 |
* 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... |
1099 1100 |
* can't format message larger than 1024 bytes, so we don't either. */ |
1da177e4c Linux-2.6.12-rc2 |
1101 1102 1103 1104 |
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, va_list args) { int len, avail; |
5ac52f33b AUDIT: buffer aud... |
1105 |
struct sk_buff *skb; |
eecb0a733 AUDIT: Fix abuse ... |
1106 |
va_list args2; |
1da177e4c Linux-2.6.12-rc2 |
1107 1108 1109 |
if (!ab) return; |
5ac52f33b AUDIT: buffer aud... |
1110 1111 1112 1113 |
BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); if (avail == 0) { |
e3b926b4c AUDIT: pass size ... |
1114 |
avail = audit_expand(ab, AUDIT_BUFSIZ); |
8fc6115c2 AUDIT: expand aud... |
1115 1116 |
if (!avail) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1117 |
} |
eecb0a733 AUDIT: Fix abuse ... |
1118 |
va_copy(args2, args); |
27a884dc3 [SK_BUFF]: Conver... |
1119 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 1123 |
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... |
1124 1125 |
avail = audit_expand(ab, max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
8fc6115c2 AUDIT: expand aud... |
1126 1127 |
if (!avail) goto out; |
27a884dc3 [SK_BUFF]: Conver... |
1128 |
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
1da177e4c Linux-2.6.12-rc2 |
1129 |
} |
148b38dc9 [patch 2/2] audit... |
1130 |
va_end(args2); |
168b71739 AUDIT: Clean up l... |
1131 1132 |
if (len > 0) skb_put(skb, len); |
8fc6115c2 AUDIT: expand aud... |
1133 1134 |
out: return; |
1da177e4c Linux-2.6.12-rc2 |
1135 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1136 1137 1138 1139 1140 1141 1142 1143 |
/** * 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 |
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 |
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... |
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 |
/** * 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. */ void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf, |
168b71739 AUDIT: Clean up l... |
1166 |
size_t len) |
83c7d0917 AUDIT: Avoid log ... |
1167 |
{ |
168b71739 AUDIT: Clean up l... |
1168 1169 1170 1171 |
int i, avail, new_len; unsigned char *ptr; struct sk_buff *skb; static const unsigned char *hex = "0123456789ABCDEF"; |
8ef2d3040 [PATCH] sanity ch... |
1172 1173 |
if (!ab) return; |
168b71739 AUDIT: Clean up l... |
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 |
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 ... |
1185 |
|
27a884dc3 [SK_BUFF]: Conver... |
1186 |
ptr = skb_tail_pointer(skb); |
168b71739 AUDIT: Clean up l... |
1187 1188 1189 1190 1191 1192 |
for (i=0; i<len; i++) { *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */ *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */ } *ptr = 0; skb_put(skb, len << 1); /* new string is twice the old string */ |
83c7d0917 AUDIT: Avoid log ... |
1193 |
} |
9c937dcc7 [PATCH] log more ... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
/* * Format a string of no more than slen characters into the audit buffer, * enclosed in quote marks. */ static void audit_log_n_string(struct audit_buffer *ab, size_t slen, const char *string) { int avail, new_len; unsigned char *ptr; struct sk_buff *skb; |
8ef2d3040 [PATCH] sanity ch... |
1204 1205 |
if (!ab) return; |
9c937dcc7 [PATCH] log more ... |
1206 1207 1208 1209 1210 1211 1212 1213 1214 |
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... |
1215 |
ptr = skb_tail_pointer(skb); |
9c937dcc7 [PATCH] log more ... |
1216 1217 1218 1219 1220 1221 1222 |
*ptr++ = '"'; memcpy(ptr, string, slen); ptr += slen; *ptr++ = '"'; *ptr = 0; skb_put(skb, slen + 2); /* don't include null terminator */ } |
b0dd25a82 [PATCH] AUDIT: ke... |
1223 |
/** |
de6bbd1d3 [AUDIT] break lar... |
1224 |
* audit_string_contains_control - does a string need to be logged in hex |
f706d5d22 audit: silence tw... |
1225 1226 |
* @string: string to be checked * @len: max length of the string to check |
de6bbd1d3 [AUDIT] break lar... |
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 |
*/ int audit_string_contains_control(const char *string, size_t len) { const unsigned char *p; for (p = string; p < (const unsigned char *)string + len && *p; p++) { if (*p == '"' || *p < 0x21 || *p > 0x7f) return 1; } return 0; } /** |
522ed7767 Audit: add TTY in... |
1239 |
* audit_log_n_untrustedstring - log a string that may contain random characters |
b0dd25a82 [PATCH] AUDIT: ke... |
1240 |
* @ab: audit_buffer |
f706d5d22 audit: silence tw... |
1241 |
* @len: length of string (not including trailing null) |
b0dd25a82 [PATCH] AUDIT: ke... |
1242 1243 1244 1245 |
* @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... |
1246 |
* or a space. Unescaped strings will start and end with a double quote mark. |
b0dd25a82 [PATCH] AUDIT: ke... |
1247 |
* Strings that are escaped are printed in hex (2 digits per char). |
9c937dcc7 [PATCH] log more ... |
1248 1249 1250 |
* * 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... |
1251 |
*/ |
de6bbd1d3 [AUDIT] break lar... |
1252 1253 |
void audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len, const char *string) |
83c7d0917 AUDIT: Avoid log ... |
1254 |
{ |
de6bbd1d3 [AUDIT] break lar... |
1255 1256 1257 1258 |
if (audit_string_contains_control(string, len)) audit_log_hex(ab, string, len); else audit_log_n_string(ab, len, string); |
83c7d0917 AUDIT: Avoid log ... |
1259 |
} |
9c937dcc7 [PATCH] log more ... |
1260 |
/** |
522ed7767 Audit: add TTY in... |
1261 |
* audit_log_untrustedstring - log a string that may contain random characters |
9c937dcc7 [PATCH] log more ... |
1262 1263 1264 |
* @ab: audit_buffer * @string: string to be logged * |
522ed7767 Audit: add TTY in... |
1265 |
* Same as audit_log_n_untrustedstring(), except that strlen is used to |
9c937dcc7 [PATCH] log more ... |
1266 1267 |
* determine string length. */ |
de6bbd1d3 [AUDIT] break lar... |
1268 |
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
9c937dcc7 [PATCH] log more ... |
1269 |
{ |
de6bbd1d3 [AUDIT] break lar... |
1270 |
audit_log_n_untrustedstring(ab, strlen(string), string); |
9c937dcc7 [PATCH] log more ... |
1271 |
} |
168b71739 AUDIT: Clean up l... |
1272 |
/* This is a helper-function to print the escaped d_path */ |
1da177e4c Linux-2.6.12-rc2 |
1273 |
void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
44707fdf5 d_path: Use struc... |
1274 |
struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
1275 |
{ |
44707fdf5 d_path: Use struc... |
1276 |
char *p, *pathname; |
1da177e4c Linux-2.6.12-rc2 |
1277 |
|
8fc6115c2 AUDIT: expand aud... |
1278 1279 |
if (prefix) audit_log_format(ab, " %s", prefix); |
1da177e4c Linux-2.6.12-rc2 |
1280 |
|
168b71739 AUDIT: Clean up l... |
1281 |
/* We will allow 11 spaces for ' (deleted)' to be appended */ |
44707fdf5 d_path: Use struc... |
1282 1283 |
pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); if (!pathname) { |
168b71739 AUDIT: Clean up l... |
1284 1285 |
audit_log_format(ab, "<no memory>"); return; |
1da177e4c Linux-2.6.12-rc2 |
1286 |
} |
cf28b4863 d_path: Make d_pa... |
1287 |
p = d_path(path, pathname, PATH_MAX+11); |
168b71739 AUDIT: Clean up l... |
1288 1289 1290 |
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ /* FIXME: can we save some information here? */ audit_log_format(ab, "<too long>"); |
5600b8927 whitespace fixes:... |
1291 |
} else |
168b71739 AUDIT: Clean up l... |
1292 |
audit_log_untrustedstring(ab, p); |
44707fdf5 d_path: Use struc... |
1293 |
kfree(pathname); |
1da177e4c Linux-2.6.12-rc2 |
1294 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1295 1296 1297 1298 1299 1300 |
/** * 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 |
1301 |
* remove them from the queue outside the irq context. May be called in |
b0dd25a82 [PATCH] AUDIT: ke... |
1302 1303 |
* any context. */ |
b7d112581 AUDIT: Send netli... |
1304 |
void audit_log_end(struct audit_buffer *ab) |
1da177e4c Linux-2.6.12-rc2 |
1305 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1306 1307 1308 1309 1310 |
if (!ab) return; if (!audit_rate_check()) { audit_log_lost("rate limit exceeded"); } else { |
8d07a67cf [PATCH] drop EOE ... |
1311 |
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
b7d112581 AUDIT: Send netli... |
1312 |
if (audit_pid) { |
b7d112581 AUDIT: Send netli... |
1313 1314 1315 1316 |
nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0); skb_queue_tail(&audit_skb_queue, ab->skb); ab->skb = NULL; wake_up_interruptible(&kauditd_wait); |
8d07a67cf [PATCH] drop EOE ... |
1317 1318 1319 1320 1321 1322 1323 1324 1325 |
} else if (nlh->nlmsg_type != AUDIT_EOE) { if (printk_ratelimit()) { printk(KERN_NOTICE "type=%d %s ", nlh->nlmsg_type, ab->skb->data + NLMSG_SPACE(0)); } else audit_log_lost("printk limit exceeded "); |
b7d112581 AUDIT: Send netli... |
1326 |
} |
1da177e4c Linux-2.6.12-rc2 |
1327 |
} |
16e1904e6 AUDIT: Add helper... |
1328 |
audit_buffer_free(ab); |
1da177e4c Linux-2.6.12-rc2 |
1329 |
} |
b0dd25a82 [PATCH] AUDIT: ke... |
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 |
/** * 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:... |
1342 |
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
9ad9ad385 AUDIT: Wait for b... |
1343 |
const char *fmt, ...) |
1da177e4c Linux-2.6.12-rc2 |
1344 1345 1346 |
{ struct audit_buffer *ab; va_list args; |
9ad9ad385 AUDIT: Wait for b... |
1347 |
ab = audit_log_start(ctx, gfp_mask, type); |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 1350 1351 1352 1353 1354 |
if (ab) { va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); audit_log_end(ab); } } |
bf45da97a [PATCH] EXPORT_SY... |
1355 1356 1357 1358 1359 |
EXPORT_SYMBOL(audit_log_start); EXPORT_SYMBOL(audit_log_end); EXPORT_SYMBOL(audit_log_format); EXPORT_SYMBOL(audit_log); |