bin/backup-audit

   1 #!/bin/bash
   2 #
   3 # backup-script system for cloning systems using rsync
   4 # Copyright (c)2008-2018 Alexander Barton, alex@barton.de
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 # Please read the file COPYING, README and AUTHORS for more information.
  11 #
  12
  13 NAME=$(basename "$0")
  14
  15 VERBOSE=0
  16 QUIET=0
  17
  18 export LC_ALL=C
  19
  20 # Default settings, can be overwritten in backup-script.conf:
  21 [ -d "/usr/local/etc/backup-script.d" ] \
  22         && conf_d="/usr/local/etc/backup-script.d" \
  23         || conf_d="/etc/backup-script.d"
  24
  25 default_backup_type="rsync"
  26 default_files="running-config"
  27 default_generations=0
  28 default_target="/var/backups"
  29
  30 # Set shell options.
  31 shopt -s nullglob
  32
  33 # Search configuration file (last one is used as default!)
  34 for conf in \
  35         "/usr/local/etc/backup-script.conf" \
  36         "/etc/backup-script.conf" \
  37         "${conf_d}/backup-script.conf" \
  38         "/usr/local/etc/backup-script.conf" \
  39 ; do
  40         if [ -r "$conf" ]; then
  41                 # shellcheck source=/dev/null
  42                 source "$conf"
  43                 break
  44         fi
  45 done
  46
  47 Usage() {
  48         echo "Usage: $NAME [-q|--quiet] [-v|--verbose] [<job> [<job> [...]]]"
  49         echo "       $NAME <-d|--dirs> <dir1> <dir2>"
  50         echo
  51         echo "  -d, --dirs      Compare two backup directories (not jobs)."
  52         echo "  -q, --quiet     Quite mode, only list jobs with changes or errors."
  53         echo "  -v, --verbose   Verbose mode, show all checks that are run."
  54         echo
  55         echo "When no <job> is given, all defined jobs are checked."
  56         echo
  57         exit 2
  58 }
  59
  60 BeginDiff() {
  61         echo "Differences in $*:"
  62 }
  63
  64 PipeDiff() {
  65         local line
  66         IFS=
  67         while read -r line; do
  68                 echo -e "     | $line"
  69         done
  70 }
  71
  72 EndDiff() {
  73         :
  74 }
  75
  76 ListDirectory() {
  77         local base_dir="$1"
  78         local dir_name="$2"
  79
  80         local exclude
  81
  82         exclude=' \.$'
  83         if [[ "$dir_name" == "/" ]]; then
  84                 exclude="$exclude"'| \.stamp$| dev$| etc$| proc$| root$| run$| sys$| tmp$'
  85                 exclude="$exclude"'| data$| net$| srv$'
  86                 exclude="$exclude"'| [[:alnum:]_-]+\.log(\.[[:alnum:]]+|)$'
  87         fi
  88
  89         # shellcheck disable=SC2012
  90         find "$base_dir$dir_name". -maxdepth 1 -printf '%M %10u:%-10g %t %12s  %f\n' 2>/dev/null \
  91                 | LC_ALL=C sort -k 9 | grep -Ev "($exclude)"
  92 }
  93
  94 HandleSystem() {
  95         local fname="$1"
  96
  97         # Set global defaults
  98         local backup_type="$default_backup_type"
  99         local files="$default_files"
 100         local generations="$default_generations"
 101         local local=0
 102         local system="$fname"
 103         local target="$default_target"
 104
 105         # Read in system configuration file
 106         # shellcheck source=/dev/null
 107         source "$f"
 108
 109         target="$target/$(basename "$f")"
 110
 111         [[ -d "$target" ]] || return 0
 112
 113         # System name
 114         [[ "$system" == "$fname" ]] \
 115                 && systxt="\"$system\"" \
 116                 || systxt="\"$fname\" [\"$system\"]"
 117         [[ "$local" -eq 0 ]] \
 118                 && echo "Checking $systxt ..." \
 119                 || echo "Checking $systxt (local system) ..."
 120
 121         # Check if job is disabled
 122         if [[ "$backup_type" == "disabled" ]]; then
 123                 echo "Job is DISABLED and will be skipped."
 124                 echo; return 0
 125         fi
 126
 127         if [ $generations -lt 1 ]; then
 128                 echo "No generations configured, nothing to compare, skipping system!"
 129                 echo; return 1
 130         fi
 131
 132         local latest_d="$target/latest"
 133         if [[ ! -d "$latest_d" || ! -r "$latest_d/.stamp" ]]; then
 134                 echo "Failed to access latest backup generation in \"$latest_d\", skipping system!"
 135                 echo; return 1
 136         fi
 137         echo "Found latest generation in \"$latest_d\"."
 138
 139         declare -i code=-1
 140         # shellcheck source=/dev/null
 141         source "$latest_d/.stamp"
 142
 143         if [[ $code -ne 0 ]]; then
 144                 echo "Warning: Last backup generation had errors, code $code!"
 145         fi
 146
 147         # Search previous generation without errors
 148         local previous_d=""
 149         # shellcheck disable=SC2045
 150         for d in $(ls -1dt "$target/"[0-9]*-[0-9]* 2>/dev/null); do
 151                 [[ -d "$d" && -r "$d/.stamp" ]] || return 0
 152
 153                 declare -i code=-1
 154                 # shellcheck source=/dev/null
 155                 source "$d/.stamp"
 156
 157                 if [[ $code -eq 0 || $code -eq 24 ]]; then
 158                         previous_d="$d"
 159                         break
 160                 fi
 161         done
 162         if [[ -z "$previous_d" || ! -d "$previous_d" || ! -r "$previous_d/.stamp" ]]; then
 163                 echo "Failed to find previous successfull backup generation, skipping system!"
 164                 echo; return 1
 165         fi
 166         echo "Comparing with generation in $previous_d ..."
 167
 168         DiffGenerations "$backup_type" "$previous_d" "$latest_d" "$files"
 169         return_code=$?
 170
 171         echo
 172         return $return_code
 173 }
 174
 175 DiffGenerations() {
 176         local backup_type="$1"
 177         local gen1_d="$2"
 178         local gen2_d="$3"
 179         local files="$4"
 180
 181         local return_code=0
 182
 183         if [[ "$backup_type" == "rsync" ]]; then
 184                 # rsync Backup Type
 185
 186                 for file in \
 187                         /etc/passwd \
 188                         /etc/shadow \
 189                         /etc/group \
 190                         /etc/gshadow \
 191                         \
 192                         /boot/grub/grub.cfg \
 193                         /etc/aliases \
 194                         /etc/bash.bashrc \
 195                         /etc/crontab \
 196                         /etc/debian_version \
 197                         /etc/environment \
 198                         /etc/fstab \
 199                         /etc/hostname \
 200                         /etc/hosts \
 201                         /etc/hosts.allow \
 202                         /etc/hosts.deny \
 203                         /etc/inittab \
 204                         /etc/ld.so.conf \
 205                         /etc/login.defs \
 206                         /etc/machine-id \
 207                         /etc/modules \
 208                         /etc/network/interfaces \
 209                         /etc/networks \
 210                         /etc/nsswitch.conf \
 211                         /etc/profile \
 212                         /etc/rc.local \
 213                         /etc/resolv.conf \
 214                         /etc/services \
 215                         /etc/shells \
 216                         /etc/ssh/sshd_config \
 217                         /etc/sshd_config \
 218                         /etc/sudoers \
 219                         /etc/sysctl.conf \
 220                 ; do
 221                         [[ -r "${gen1_d}${file}" ]] || continue
 222
 223                         [[ $VERBOSE -ne 0 ]] && echo "Checking \"$file\" ..."
 224                         if ! diff -U 3 "${gen1_d}${file}" "${gen2_d}${file}" >"$tmp_diff"; then
 225                                 BeginDiff "\"$file\""
 226                                 tail -n +3 "$tmp_diff" | PipeDiff
 227                                 EndDiff
 228                                 return_code=1
 229                         fi
 230                 done
 231
 232                 for dir in \
 233                         / \
 234                         /etc/cron.d/ \
 235                         /etc/cron.daily/ \
 236                         /etc/cron.hourly/ \
 237                         /etc/cron.monthly/ \
 238                         /etc/cron.weekly/ \
 239                         /etc/init.d/ \
 240                         /etc/sudoers.d/ \
 241                         /etc/systemd/network/ \
 242                         /etc/systemd/system/ \
 243                         /etc/systemd/user/ \
 244                         /var/log/dumps/ \
 245                 ; do
 246                         [[ ! -d "${gen1_d}${dir}" ]] && continue
 247                         [[ ! -d "${gen2_d}${dir}" ]] && continue
 248
 249                         # Make sure that this is a system root; comparing other
 250                         # root folders results in misleading output ...
 251                         [[ "$dir" == "/" && ! -d "${gen1_d}${dir}/etc" ]] && continue
 252
 253                         [[ $VERBOSE -ne 0 ]] && echo "Checking \"$dir\" ..."
 254                         ListDirectory "${gen1_d}" "${dir}" >"$tmp_1"
 255                         ListDirectory "${gen2_d}" "${dir}" >"$tmp_2"
 256                         if ! diff -U 0 "$tmp_1" "$tmp_2" >"$tmp_diff"; then
 257                                 BeginDiff "\"$dir\" directory"
 258                                 tail -n +3 "$tmp_diff" | egrep -v '^@@ ' | PipeDiff
 259                                 EndDiff
 260                                 return_code=1
 261                         fi
 262                 done
 263
 264                 if [[ -d "${gen1_d}/var/lib/dpkg/info" && -d "${gen2_d}/var/lib/dpkg/info" ]]; then
 265                         [[ $VERBOSE -ne 0 ]] && echo "Checking list of installed packages ..."
 266                         chroot "${gen1_d}" dpkg --get-selections >"$tmp_1" || return 2
 267                         chroot "${gen2_d}" dpkg --get-selections >"$tmp_2" || return 2
 268                         if ! diff -U 0 "$tmp_1" "$tmp_2" >"$tmp_diff"; then
 269                                 BeginDiff "list of installed packages"
 270                                 tail -n +3 "$tmp_diff" | grep -v '^@@ ' | PipeDiff
 271                                 EndDiff
 272                                 return_code=1
 273                         fi
 274                 fi
 275         elif [[ "$backup_type" == "scp" ]]; then
 276                 # scp Backup type
 277                 file=$(basename "$files")
 278                 [[ $VERBOSE -ne 0 ]] && echo "Checking \"$file\" ..."
 279                 if ! diff -U 3 "${gen1_d}/${file}" "${gen2_d}/${file}" >"$tmp_diff"; then
 280                         BeginDiff "\"$file\""
 281                         tail -n +3 "$tmp_diff" | PipeDiff
 282                         EndDiff
 283                         return_code=1
 284                 fi
 285         else
 286                 echo "Backup type \"$backup_type\" undefined, \"$system\" skipped!"
 287                 echo; return 2
 288         fi
 289
 290         return $return_code
 291 }
 292
 293 MkTempFiles() {
 294         tmp_1=$(mktemp "/tmp/$NAME.XXXXXX") || exit 1
 295         tmp_2=$(mktemp "/tmp/$NAME.XXXXXX") || exit 1
 296         tmp_diff=$(mktemp "/tmp/$NAME.XXXXXX") || exit 1
 297         tmp_out=$(mktemp "/tmp/$NAME.XXXXXX") || exit 1
 298 }
 299
 300 CleanUp() {
 301         rm -f "$tmp_1" "$tmp_2" "$tmp_diff" "$tmp_out"
 302 }
 303
 304 while [[ $# -gt 0 ]]; do
 305         case "$1" in
 306           "-d"|"--dirs")
 307                 shift
 308                 [[ $# -eq 2 ]] || Usage
 309                 MkTempFiles
 310                 DiffGenerations "$default_backup_type" "$1" "$2" "$default_files"
 311                 return_code=$?
 312                 CleanUp
 313                 exit $return_code
 314                 ;;
 315           "-q"|"--quiet")
 316                 QUIET=1; shift
 317                 ;;
 318           "-v"|"--verbose")
 319                 VERBOSE=1; shift
 320                 ;;
 321           "-"*)
 322                 Usage
 323                 ;;
 324           *)
 325                 break
 326         esac
 327 done
 328
 329 if [[ $# -ge 1 ]]; then
 330         for s in "$@"; do
 331                 if [ ! -r "${conf_d}/$s" ]; then
 332                         echo "$NAME: Can' read \"${conf_d}/$s\"!"
 333                         exit 1
 334                 fi
 335                 sys+=("${conf_d}/$s")
 336         done
 337 else
 338         sys=("${conf_d}/"*)
 339 fi
 340
 341 MkTempFiles
 342 for f in "${sys[@]}"; do
 343         [[ -r "$f" && -f "$f" ]] || continue
 344
 345         fname=$(basename "$f")
 346         case "$fname" in
 347                 "backup-script.conf"|*.sh)
 348                         continue
 349                         ;;
 350         esac
 351
 352         HandleSystem "$fname" >"$tmp_out" 2>&1; result=$?
 353         [[ $QUIET -eq 0 || $result -ne 0 ]] && cat "$tmp_out"
 354 done
 355 CleanUp
 356
 357 # -eof-