ae1078d657
Add the argument auditing functions for argv and env. Add kernel-specific versions of the tokenizer functions for the arg and env represented as a char array. Implement the AUDIT_ARGV and AUDIT_ARGE audit policy commands to enable/disable argv/env auditing. Call the argument auditing from the exec system calls. Obtained from: TrustedBSD Project Approved by: rwatson (mentor)
658 lines
17 KiB
C
658 lines
17 KiB
C
/*
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* Copyright (c) 1999-2005 Apple Computer, Inc.
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* Copyright (c) 2006 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/condvar.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/fcntl.h>
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#include <sys/ipc.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <bsm/audit.h>
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#include <bsm/audit_internal.h>
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#include <bsm/audit_kevents.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <security/audit/audit.h>
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#include <security/audit/audit_private.h>
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#include <vm/uma.h>
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static uma_zone_t audit_record_zone;
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static MALLOC_DEFINE(M_AUDITPROC, "audit_proc", "Audit process storage");
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MALLOC_DEFINE(M_AUDITDATA, "audit_data", "Audit data storage");
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MALLOC_DEFINE(M_AUDITPATH, "audit_path", "Audit path storage");
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MALLOC_DEFINE(M_AUDITTEXT, "audit_text", "Audit text storage");
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/*
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* Audit control settings that are set/read by system calls and are
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* hence non-static.
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*/
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/*
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* Define the audit control flags.
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*/
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int audit_enabled;
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int audit_suspended;
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/*
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* Flags controlling behavior in low storage situations.
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* Should we panic if a write fails? Should we fail stop
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* if we're out of disk space?
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*/
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int audit_panic_on_write_fail;
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int audit_fail_stop;
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int audit_argv;
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int audit_arge;
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/*
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* Are we currently "failing stop" due to out of disk space?
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*/
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int audit_in_failure;
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/*
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* Global audit statistiscs.
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*/
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struct audit_fstat audit_fstat;
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/*
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* Preselection mask for non-attributable events.
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*/
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struct au_mask audit_nae_mask;
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/*
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* Mutex to protect global variables shared between various threads and
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* processes.
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*/
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struct mtx audit_mtx;
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/*
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* Queue of audit records ready for delivery to disk. We insert new
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* records at the tail, and remove records from the head. Also,
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* a count of the number of records used for checking queue depth.
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* In addition, a counter of records that we have allocated but are
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* not yet in the queue, which is needed to estimate the total
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* size of the combined set of records outstanding in the system.
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*/
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struct kaudit_queue audit_q;
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int audit_q_len;
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int audit_pre_q_len;
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/*
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* Audit queue control settings (minimum free, low/high water marks, etc.)
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*/
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struct au_qctrl audit_qctrl;
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/*
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* Condition variable to signal to the worker that it has work to do:
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* either new records are in the queue, or a log replacement is taking
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* place.
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*/
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struct cv audit_worker_cv;
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/*
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* Condition variable to flag when crossing the low watermark, meaning that
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* threads blocked due to hitting the high watermark can wake up and continue
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* to commit records.
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*/
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struct cv audit_watermark_cv;
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/*
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* Condition variable for auditing threads wait on when in fail-stop mode.
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* Threads wait on this CV forever (and ever), never seeing the light of
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* day again.
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*/
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static struct cv audit_fail_cv;
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/*
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* Construct an audit record for the passed thread.
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*/
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static int
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audit_record_ctor(void *mem, int size, void *arg, int flags)
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{
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struct kaudit_record *ar;
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struct thread *td;
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KASSERT(sizeof(*ar) == size, ("audit_record_ctor: wrong size"));
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td = arg;
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ar = mem;
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bzero(ar, sizeof(*ar));
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ar->k_ar.ar_magic = AUDIT_RECORD_MAGIC;
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nanotime(&ar->k_ar.ar_starttime);
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/*
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* Export the subject credential.
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*/
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cru2x(td->td_ucred, &ar->k_ar.ar_subj_cred);
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ar->k_ar.ar_subj_ruid = td->td_ucred->cr_ruid;
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ar->k_ar.ar_subj_rgid = td->td_ucred->cr_rgid;
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ar->k_ar.ar_subj_egid = td->td_ucred->cr_groups[0];
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PROC_LOCK(td->td_proc);
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ar->k_ar.ar_subj_auid = td->td_proc->p_au->ai_auid;
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ar->k_ar.ar_subj_asid = td->td_proc->p_au->ai_asid;
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ar->k_ar.ar_subj_pid = td->td_proc->p_pid;
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ar->k_ar.ar_subj_amask = td->td_proc->p_au->ai_mask;
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ar->k_ar.ar_subj_term = td->td_proc->p_au->ai_termid;
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bcopy(td->td_proc->p_comm, ar->k_ar.ar_subj_comm, MAXCOMLEN);
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PROC_UNLOCK(td->td_proc);
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return (0);
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}
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static void
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audit_record_dtor(void *mem, int size, void *arg)
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{
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struct kaudit_record *ar;
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KASSERT(sizeof(*ar) == size, ("audit_record_dtor: wrong size"));
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ar = mem;
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if (ar->k_ar.ar_arg_upath1 != NULL)
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free(ar->k_ar.ar_arg_upath1, M_AUDITPATH);
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if (ar->k_ar.ar_arg_upath2 != NULL)
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free(ar->k_ar.ar_arg_upath2, M_AUDITPATH);
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if (ar->k_ar.ar_arg_text != NULL)
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free(ar->k_ar.ar_arg_text, M_AUDITTEXT);
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if (ar->k_udata != NULL)
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free(ar->k_udata, M_AUDITDATA);
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if (ar->k_ar.ar_arg_argv != NULL)
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free(ar->k_ar.ar_arg_argv, M_AUDITTEXT);
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if (ar->k_ar.ar_arg_envv != NULL)
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free(ar->k_ar.ar_arg_envv, M_AUDITTEXT);
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}
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/*
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* Initialize the Audit subsystem: configuration state, work queue,
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* synchronization primitives, worker thread, and trigger device node. Also
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* call into the BSM assembly code to initialize it.
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*/
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static void
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audit_init(void)
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{
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printf("Security auditing service present\n");
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audit_enabled = 0;
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audit_suspended = 0;
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audit_panic_on_write_fail = 0;
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audit_fail_stop = 0;
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audit_in_failure = 0;
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audit_argv = 0;
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audit_arge = 0;
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audit_fstat.af_filesz = 0; /* '0' means unset, unbounded */
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audit_fstat.af_currsz = 0;
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audit_nae_mask.am_success = AU_NULL;
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audit_nae_mask.am_failure = AU_NULL;
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TAILQ_INIT(&audit_q);
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audit_q_len = 0;
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audit_pre_q_len = 0;
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audit_qctrl.aq_hiwater = AQ_HIWATER;
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audit_qctrl.aq_lowater = AQ_LOWATER;
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audit_qctrl.aq_bufsz = AQ_BUFSZ;
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audit_qctrl.aq_minfree = AU_FS_MINFREE;
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mtx_init(&audit_mtx, "audit_mtx", NULL, MTX_DEF);
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cv_init(&audit_worker_cv, "audit_worker_cv");
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cv_init(&audit_watermark_cv, "audit_watermark_cv");
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cv_init(&audit_fail_cv, "audit_fail_cv");
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audit_record_zone = uma_zcreate("audit_record",
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sizeof(struct kaudit_record), audit_record_ctor,
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audit_record_dtor, NULL, NULL, UMA_ALIGN_PTR, 0);
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/* Initialize the BSM audit subsystem. */
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kau_init();
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audit_trigger_init();
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/* Register shutdown handler. */
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EVENTHANDLER_REGISTER(shutdown_pre_sync, audit_shutdown, NULL,
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SHUTDOWN_PRI_FIRST);
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/* Start audit worker thread. */
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audit_worker_init();
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}
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SYSINIT(audit_init, SI_SUB_AUDIT, SI_ORDER_FIRST, audit_init, NULL)
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/*
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* Drain the audit queue and close the log at shutdown. Note that this can
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* be called both from the system shutdown path and also from audit
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* configuration syscalls, so 'arg' and 'howto' are ignored.
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*/
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void
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audit_shutdown(void *arg, int howto)
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{
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audit_rotate_vnode(NULL, NULL);
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}
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/*
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* Return the current thread's audit record, if any.
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*/
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__inline__ struct kaudit_record *
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currecord(void)
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{
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return (curthread->td_ar);
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}
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/*
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* MPSAFE
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*
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* XXXAUDIT: There are a number of races present in the code below due to
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* release and re-grab of the mutex. The code should be revised to become
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* slightly less racy.
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*
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* XXXAUDIT: Shouldn't there be logic here to sleep waiting on available
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* pre_q space, suspending the system call until there is room?
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*/
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struct kaudit_record *
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audit_new(int event, struct thread *td)
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{
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struct kaudit_record *ar;
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int no_record;
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mtx_lock(&audit_mtx);
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no_record = (audit_suspended || !audit_enabled);
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mtx_unlock(&audit_mtx);
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if (no_record)
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return (NULL);
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/*
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* XXX: The number of outstanding uncommitted audit records is
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* limited to the number of concurrent threads servicing system
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* calls in the kernel.
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*/
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ar = uma_zalloc_arg(audit_record_zone, td, M_WAITOK);
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ar->k_ar.ar_event = event;
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mtx_lock(&audit_mtx);
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audit_pre_q_len++;
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mtx_unlock(&audit_mtx);
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return (ar);
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}
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void
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audit_free(struct kaudit_record *ar)
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{
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uma_zfree(audit_record_zone, ar);
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}
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/*
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* MPSAFE
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*/
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void
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audit_commit(struct kaudit_record *ar, int error, int retval)
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{
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au_event_t event;
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au_class_t class;
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au_id_t auid;
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int sorf;
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struct au_mask *aumask;
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if (ar == NULL)
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return;
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/*
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* Decide whether to commit the audit record by checking the
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* error value from the system call and using the appropriate
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* audit mask.
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*
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* XXXAUDIT: Synchronize access to audit_nae_mask?
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*/
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if (ar->k_ar.ar_subj_auid == AU_DEFAUDITID)
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aumask = &audit_nae_mask;
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else
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aumask = &ar->k_ar.ar_subj_amask;
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if (error)
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sorf = AU_PRS_FAILURE;
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else
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sorf = AU_PRS_SUCCESS;
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switch(ar->k_ar.ar_event) {
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case AUE_OPEN_RWTC:
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/* The open syscall always writes a AUE_OPEN_RWTC event; change
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* it to the proper type of event based on the flags and the
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* error value.
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*/
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ar->k_ar.ar_event = flags_and_error_to_openevent(
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ar->k_ar.ar_arg_fflags, error);
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break;
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case AUE_SYSCTL:
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ar->k_ar.ar_event = ctlname_to_sysctlevent(
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ar->k_ar.ar_arg_ctlname, ar->k_ar.ar_valid_arg);
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break;
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case AUE_AUDITON:
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/* Convert the auditon() command to an event */
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ar->k_ar.ar_event = auditon_command_event(ar->k_ar.ar_arg_cmd);
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break;
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}
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auid = ar->k_ar.ar_subj_auid;
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event = ar->k_ar.ar_event;
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class = au_event_class(event);
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ar->k_ar_commit |= AR_COMMIT_KERNEL;
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if (au_preselect(event, class, aumask, sorf) != 0)
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ar->k_ar_commit |= AR_PRESELECT_TRAIL;
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if (audit_pipe_preselect(auid, event, class, sorf,
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ar->k_ar_commit & AR_PRESELECT_TRAIL) != 0)
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ar->k_ar_commit |= AR_PRESELECT_PIPE;
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if ((ar->k_ar_commit & (AR_PRESELECT_TRAIL | AR_PRESELECT_PIPE)) ==
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0) {
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mtx_lock(&audit_mtx);
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audit_pre_q_len--;
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mtx_unlock(&audit_mtx);
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audit_free(ar);
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return;
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}
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ar->k_ar.ar_errno = error;
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ar->k_ar.ar_retval = retval;
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/*
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* We might want to do some system-wide post-filtering
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* here at some point.
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*/
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/*
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* Timestamp system call end.
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*/
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nanotime(&ar->k_ar.ar_endtime);
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mtx_lock(&audit_mtx);
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/*
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* Note: it could be that some records initiated while audit was
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* enabled should still be committed?
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*/
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if (audit_suspended || !audit_enabled) {
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audit_pre_q_len--;
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mtx_unlock(&audit_mtx);
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audit_free(ar);
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return;
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}
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/*
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* Constrain the number of committed audit records based on
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* the configurable parameter.
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*/
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while (audit_q_len >= audit_qctrl.aq_hiwater) {
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AUDIT_PRINTF(("audit_commit: sleeping to wait for "
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"audit queue to drain below high water mark\n"));
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cv_wait(&audit_watermark_cv, &audit_mtx);
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AUDIT_PRINTF(("audit_commit: woke up waiting for "
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"audit queue draining\n"));
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}
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TAILQ_INSERT_TAIL(&audit_q, ar, k_q);
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audit_q_len++;
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audit_pre_q_len--;
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cv_signal(&audit_worker_cv);
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mtx_unlock(&audit_mtx);
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}
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/*
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* audit_syscall_enter() is called on entry to each system call. It is
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* responsible for deciding whether or not to audit the call (preselection),
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* and if so, allocating a per-thread audit record. audit_new() will fill in
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* basic thread/credential properties.
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*/
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void
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audit_syscall_enter(unsigned short code, struct thread *td)
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{
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struct au_mask *aumask;
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au_class_t class;
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au_event_t event;
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au_id_t auid;
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KASSERT(td->td_ar == NULL, ("audit_syscall_enter: td->td_ar != NULL"));
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/*
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* In FreeBSD, each ABI has its own system call table, and hence
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* mapping of system call codes to audit events. Convert the code to
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* an audit event identifier using the process system call table
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* reference. In Darwin, there's only one, so we use the global
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* symbol for the system call table.
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*
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* XXXAUDIT: Should we audit that a bad system call was made, and if
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* so, how?
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*/
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if (code >= td->td_proc->p_sysent->sv_size)
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return;
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event = td->td_proc->p_sysent->sv_table[code].sy_auevent;
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if (event == AUE_NULL)
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return;
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/*
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* Check which audit mask to use; either the kernel non-attributable
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* event mask or the process audit mask.
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*/
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auid = td->td_proc->p_au->ai_auid;
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if (auid == AU_DEFAUDITID)
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aumask = &audit_nae_mask;
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else
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aumask = &td->td_proc->p_au->ai_mask;
|
|
|
|
/*
|
|
* Allocate an audit record, if preselection allows it, and store
|
|
* in the thread for later use.
|
|
*/
|
|
class = au_event_class(event);
|
|
if (au_preselect(event, class, aumask, AU_PRS_BOTH)) {
|
|
/*
|
|
* If we're out of space and need to suspend unprivileged
|
|
* processes, do that here rather than trying to allocate
|
|
* another audit record.
|
|
*
|
|
* XXXRW: We might wish to be able to continue here in the
|
|
* future, if the system recovers. That should be possible
|
|
* by means of checking the condition in a loop around
|
|
* cv_wait(). It might be desirable to reevaluate whether an
|
|
* audit record is still required for this event by
|
|
* re-calling au_preselect().
|
|
*/
|
|
if (audit_in_failure && suser(td) != 0) {
|
|
cv_wait(&audit_fail_cv, &audit_mtx);
|
|
panic("audit_failing_stop: thread continued");
|
|
}
|
|
td->td_ar = audit_new(event, td);
|
|
} else if (audit_pipe_preselect(auid, event, class, AU_PRS_BOTH, 0))
|
|
td->td_ar = audit_new(event, td);
|
|
else
|
|
td->td_ar = NULL;
|
|
}
|
|
|
|
/*
|
|
* audit_syscall_exit() is called from the return of every system call, or in
|
|
* the event of exit1(), during the execution of exit1(). It is responsible
|
|
* for committing the audit record, if any, along with return condition.
|
|
*/
|
|
void
|
|
audit_syscall_exit(int error, struct thread *td)
|
|
{
|
|
int retval;
|
|
|
|
/*
|
|
* Commit the audit record as desired; once we pass the record
|
|
* into audit_commit(), the memory is owned by the audit
|
|
* subsystem.
|
|
* The return value from the system call is stored on the user
|
|
* thread. If there was an error, the return value is set to -1,
|
|
* imitating the behavior of the cerror routine.
|
|
*/
|
|
if (error)
|
|
retval = -1;
|
|
else
|
|
retval = td->td_retval[0];
|
|
|
|
audit_commit(td->td_ar, error, retval);
|
|
if (td->td_ar != NULL)
|
|
AUDIT_PRINTF(("audit record committed by pid %d\n",
|
|
td->td_proc->p_pid));
|
|
td->td_ar = NULL;
|
|
|
|
}
|
|
|
|
/*
|
|
* Allocate storage for a new process (init, or otherwise).
|
|
*/
|
|
void
|
|
audit_proc_alloc(struct proc *p)
|
|
{
|
|
|
|
KASSERT(p->p_au == NULL, ("audit_proc_alloc: p->p_au != NULL (%d)",
|
|
p->p_pid));
|
|
p->p_au = malloc(sizeof(*(p->p_au)), M_AUDITPROC, M_WAITOK);
|
|
/* XXXAUDIT: Zero? Slab allocate? */
|
|
//printf("audit_proc_alloc: pid %d p_au %p\n", p->p_pid, p->p_au);
|
|
}
|
|
|
|
/*
|
|
* Allocate storage for a new thread.
|
|
*/
|
|
void
|
|
audit_thread_alloc(struct thread *td)
|
|
{
|
|
|
|
td->td_ar = NULL;
|
|
}
|
|
|
|
/*
|
|
* Thread destruction.
|
|
*/
|
|
void
|
|
audit_thread_free(struct thread *td)
|
|
{
|
|
|
|
KASSERT(td->td_ar == NULL, ("audit_thread_free: td_ar != NULL"));
|
|
}
|
|
|
|
/*
|
|
* Initialize the audit information for the a process, presumably the first
|
|
* process in the system.
|
|
* XXX It is not clear what the initial values should be for audit ID,
|
|
* session ID, etc.
|
|
*/
|
|
void
|
|
audit_proc_kproc0(struct proc *p)
|
|
{
|
|
|
|
KASSERT(p->p_au != NULL, ("audit_proc_kproc0: p->p_au == NULL (%d)",
|
|
p->p_pid));
|
|
//printf("audit_proc_kproc0: pid %d p_au %p\n", p->p_pid, p->p_au);
|
|
bzero(p->p_au, sizeof(*(p)->p_au));
|
|
}
|
|
|
|
void
|
|
audit_proc_init(struct proc *p)
|
|
{
|
|
|
|
KASSERT(p->p_au != NULL, ("audit_proc_init: p->p_au == NULL (%d)",
|
|
p->p_pid));
|
|
//printf("audit_proc_init: pid %d p_au %p\n", p->p_pid, p->p_au);
|
|
bzero(p->p_au, sizeof(*(p)->p_au));
|
|
p->p_au->ai_auid = AU_DEFAUDITID;
|
|
}
|
|
|
|
/*
|
|
* Copy the audit info from the parent process to the child process when
|
|
* a fork takes place.
|
|
*/
|
|
void
|
|
audit_proc_fork(struct proc *parent, struct proc *child)
|
|
{
|
|
|
|
PROC_LOCK_ASSERT(parent, MA_OWNED);
|
|
PROC_LOCK_ASSERT(child, MA_OWNED);
|
|
KASSERT(parent->p_au != NULL,
|
|
("audit_proc_fork: parent->p_au == NULL (%d)", parent->p_pid));
|
|
KASSERT(child->p_au != NULL,
|
|
("audit_proc_fork: child->p_au == NULL (%d)", child->p_pid));
|
|
//printf("audit_proc_fork: parent pid %d p_au %p\n", parent->p_pid,
|
|
// parent->p_au);
|
|
//printf("audit_proc_fork: child pid %d p_au %p\n", child->p_pid,
|
|
// child->p_au);
|
|
bcopy(parent->p_au, child->p_au, sizeof(*child->p_au));
|
|
/*
|
|
* XXXAUDIT: Zero pointers to external memory, or assert they are
|
|
* zero?
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Free the auditing structure for the process.
|
|
*/
|
|
void
|
|
audit_proc_free(struct proc *p)
|
|
{
|
|
|
|
KASSERT(p->p_au != NULL, ("p->p_au == NULL (%d)", p->p_pid));
|
|
//printf("audit_proc_free: pid %d p_au %p\n", p->p_pid, p->p_au);
|
|
/*
|
|
* XXXAUDIT: Assert that external memory pointers are NULL?
|
|
*/
|
|
free(p->p_au, M_AUDITPROC);
|
|
p->p_au = NULL;
|
|
}
|