1#!/bin/sh
2#
3# Copyright (c) 2001  The FreeBSD Project
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27# $FreeBSD: head/etc/periodic/security/security.functions 322868 2017-08-25 00:28:56Z asomers $
28#
29
30# This is a library file, so we only try to do something when sourced.
31case "$0" in
32*/security.functions) exit 0 ;;
33esac
34
35security_daily_compat_var security_status_logdir
36security_daily_compat_var security_status_diff_flags
37
38#
39# Show differences in the output of an audit command
40#
41
42LOG="${security_status_logdir}"
43rc=0
44
45# Usage: COMMAND | check_diff [new_only] LABEL - MSG
46#        COMMAND > TMPFILE; check_diff [new_only] LABEL TMPFILE MSG
47#   if $1 is new_only, show only the 'new' part of the diff.
48#   LABEL is the base name of the ${LOG}/${label}.{today,yesterday} files.
49
50check_diff() {
51  unset IFS
52  rc=0
53  if [ "$1" = "new_only" ]; then
54    shift
55    filter="grep '^[>+][^+]'"
56  else
57    filter="cat"
58  fi
59  label="$1"; shift
60  tmpf="$1"; shift
61  msg="$1"; shift
62
63  if [ "${tmpf}" = "-" ]; then
64    tmpf=`mktemp -t security`
65    cat > ${tmpf}
66  fi
67
68  if [ ! -f ${LOG}/${label}.today ]; then
69    rc=1
70    echo ""
71    echo "No ${LOG}/${label}.today"
72    cp ${tmpf} ${LOG}/${label}.today || rc=3
73  fi
74
75  if ! cmp -s ${LOG}/${label}.today ${tmpf} >/dev/null; then
76    [ $rc -lt 1 ] && rc=1
77    echo ""
78    echo "${msg}"
79    diff ${security_status_diff_flags} ${LOG}/${label}.today \
80	${tmpf} | eval "${filter}"
81    mv ${LOG}/${label}.today ${LOG}/${label}.yesterday || rc=3
82    mv ${tmpf} ${LOG}/${label}.today || rc=3
83  fi
84
85  rm -f ${tmpf}
86  exit ${rc}
87}
88