A few stability improvements. Added Fenrir ssh announcement script.
This commit is contained in:
7
.gitignore
vendored
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7
.gitignore
vendored
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@@ -0,0 +1,7 @@
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AGENTS.md
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CLAUDE.md
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*.qcow2
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*.img
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*.sha1sum
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*.xz
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*.zst
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@@ -25,16 +25,24 @@ set -e # Don't want to destroy stuff if this goes majorly wrong.
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trap cleanup EXIT # make sure the script cleans up after itself before closing.
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# shellcheck disable=SC2329 # cleanup is invoked via trap EXIT
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cleanup() {
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status=$? # capture original exit status so failures propagate
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if [[ $mounted -eq 0 ]]; then
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umount -R /mnt
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partx -d "${loopdev}"
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losetup --detach "${loopdev}"
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umount -R /mnt || true
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fi
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if [[ -n "${imageFileName}" ]]; then
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if [[ -n "${loopdev:-}" ]]; then
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partx -d "${loopdev}" || true
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losetup --detach "${loopdev}" || true
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fi
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if [[ -n "${imageFileName:-}" ]]; then
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rm "${imageFileName}"
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fi
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exit 0
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exit "$status"
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}
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help() {
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@@ -122,7 +130,7 @@ imageUrl="http://os.archlinuxarm.org/os/ArchLinuxARM-rpi-aarch64-latest.tar.gz"
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fallocate -l "$imageSize" "$imageName"
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loopdev="$(losetup --find --show "${imageName}")"
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parted --script "${loopdev}" mklabel msdos mkpart primary fat32 0% 200M mkpart primary ext4 200M 100%
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parted --script "${loopdev}" mklabel msdos mkpart primary fat32 0% 512M mkpart primary ext4 512M 100%
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mkfs.vfat -F32 -n STRMX_BOOT "${loopdev}p1"
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mkfs.ext4 -F -L STRMX_ROOT "${loopdev}p2"
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mount "${loopdev}p2" /mnt
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@@ -130,7 +138,7 @@ mkdir /mnt/boot
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mount "${loopdev}p1" /mnt/boot
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# Things are mounted now, so set mounted to 0 (bash true)
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mounted=0
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imageFileName=$(mktemp)
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imageFileName=$(mktemp -p . ArchLinuxARM-rpi-aarch64-XXXXXX.tar.gz)
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wget "${imageUrl}" -O "${imageFileName}"
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bsdtar -xpf "${imageFileName}" -C /mnt
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@@ -143,6 +151,7 @@ find ../files/etc -mindepth 1 -maxdepth 1 ! -name skel -exec cp -rv {} /mnt/etc/
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PS1="(Chroot) [\u@\h \W] \$" arch-chroot /mnt << EOF
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echo "Chroot started."
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set -euo pipefail
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# set up pacman
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pacman-key --init
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pacman-key --populate archlinuxarm
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@@ -301,6 +310,7 @@ services=(
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log-to-ram-sync.timer
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log-to-ram-shutdown.service
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NetworkManager.service
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ssh-login-monitor.service
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)
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for service in "\${services[@]}"; do
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@@ -311,8 +321,7 @@ for service in "\${services[@]}"; do
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echo " \$service: FAILED"
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fi
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done
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# Cleanup packages
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pacman -Runcds libx11 --noconfirm
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pacman -Sc --noconfirm
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EOF
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@@ -320,5 +329,8 @@ EOF
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# Copy skel files to stormux user home (after user rename in chroot)
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find ../files/etc/skel/ -mindepth 1 -exec cp -rv "{}" /mnt/home/stormux/ \;
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# Copy boot files again to ensure custom config overrides any package changes
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cp -rv ../files/boot/* /mnt/boot
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# Exiting calls the cleanup function to unmount.
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exit 0
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17
pi4/files/etc/systemd/system/ssh-login-monitor.service
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17
pi4/files/etc/systemd/system/ssh-login-monitor.service
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[Unit]
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Description=Fenrir SSH Login Monitor
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After=sshd.service
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Wants=sshd.service
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[Service]
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Type=simple
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ExecStart=/usr/share/fenrirscreenreader/scripts/ssh-login-monitor.sh
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Restart=on-failure
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RestartSec=5
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# Security settings
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NoNewPrivileges=true
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PrivateTmp=false
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[Install]
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WantedBy=multi-user.target
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185
pi4/files/usr/share/fenrirscreenreader/scripts/ssh-login-monitor.sh
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185
pi4/files/usr/share/fenrirscreenreader/scripts/ssh-login-monitor.sh
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#!/usr/bin/env bash
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# SSH Login Monitor for Fenrir Screen Reader
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# Monitors SSH logins and announces them via Fenrir's speech system
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# Configuration
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fenrirSocket="/tmp/fenrirscreenreader-deamon.sock"
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logFile="/var/log/auth.log"
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stateFile="/tmp/fenrir-ssh-monitor.state"
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checkInterval=2 # seconds between checks
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# Voice settings
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announceUser=true
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announceIp=true
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announceHostname=true
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announceLogout=false # Announce SSH disconnections (disabled by default - may not work reliably on all systems)
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# Function to send message to Fenrir
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fenrirSay() {
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local message="$1"
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# Only announce if Fenrir socket exists (silently skip if not)
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if [[ -S "$fenrirSocket" ]]; then
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echo "command say ${message}" | socat - UNIX-CLIENT:"${fenrirSocket}" 2>/dev/null
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fi
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}
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# Function to get last processed line number
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getLastLine() {
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if [[ -f "$stateFile" ]]; then
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cat "$stateFile"
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else
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echo "0"
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fi
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}
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# Function to save last processed line number
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saveLastLine() {
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echo "$1" > "$stateFile"
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}
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# Function to parse SSH login and announce
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processLogin() {
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local logLine="$1"
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local user=""
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local ip=""
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local hostname=""
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# Parse different SSH login patterns
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# Pattern 1: "Accepted publickey for USER from IP"
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# Pattern 2: "Accepted password for USER from IP"
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if [[ "$logLine" =~ Accepted\ (publickey|password|keyboard-interactive/pam)\ for\ ([^[:space:]]+)\ from\ ([^[:space:]]+) ]]; then
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user="${BASH_REMATCH[2]}"
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ip="${BASH_REMATCH[3]}"
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# Try to resolve hostname
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if command -v host &> /dev/null && [[ "$announceHostname" == "true" ]]; then
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hostname="$(host "$ip" 2>/dev/null | grep -oP 'domain name pointer \K[^.]+' | head -1)"
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fi
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# Build announcement message (concise format)
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local message=""
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if [[ "$announceUser" == "true" ]]; then
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message+="${user} "
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fi
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message+="S S H login"
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if [[ "$announceIp" == "true" ]]; then
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message+=" from ${ip}"
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fi
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if [[ -n "$hostname" ]] && [[ "$announceHostname" == "true" ]]; then
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message+=" ${hostname}"
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fi
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fenrirSay "$message"
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return 0
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fi
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return 1
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}
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# Function to parse SSH logout and announce
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processLogout() {
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local logLine="$1"
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local user=""
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# Parse SSH disconnect patterns
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# Pattern: "pam_unix(sshd:session): session closed for user USER"
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if [[ "$logLine" =~ session\ closed\ for\ user\ ([^[:space:]]+) ]]; then
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user="${BASH_REMATCH[1]}"
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if [[ "$announceLogout" == "true" ]]; then
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local message=""
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if [[ "$announceUser" == "true" ]]; then
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message+="${user} "
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fi
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message+="disconnected from S S H"
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fenrirSay "$message"
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fi
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return 0
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fi
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return 1
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}
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# Function to monitor auth.log
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monitorAuthLog() {
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local lastLine
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lastLine=$(getLastLine)
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# Get total lines in log
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local totalLines
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totalLines=$(wc -l < "$logFile" 2>/dev/null || echo "0")
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# If log was rotated, reset
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if [[ $totalLines -lt $lastLine ]]; then
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lastLine=0
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fi
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# Process new lines
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if [[ $totalLines -gt $lastLine ]]; then
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local newLines=$((totalLines - lastLine))
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# Read only new lines
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tail -n "$newLines" "$logFile" 2>/dev/null | while IFS= read -r line; do
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if [[ "$line" =~ sshd.*Accepted ]]; then
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processLogin "$line"
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elif [[ "$line" =~ sshd.*session\ closed ]]; then
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processLogout "$line"
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fi
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done
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saveLastLine "$totalLines"
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fi
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}
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# Function to monitor journalctl (alternative for systemd systems)
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monitorJournalctl() {
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# Follow journalctl for SSH logins and logouts
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journalctl -u sshd -u ssh -f -n 0 --no-pager 2>/dev/null | while IFS= read -r line; do
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if [[ "$line" =~ Accepted ]]; then
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processLogin "$line"
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elif [[ "$line" =~ session\ closed ]]; then
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processLogout "$line"
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fi
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done
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}
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# Check if running as root
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if [[ "$(id -u)" -ne 0 ]]; then
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echo "Error: This script must be run with sudo privileges to access system logs."
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exit 1
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fi
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# Note: We don't require Fenrir to be running at startup
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# The script will silently skip announcements when Fenrir socket doesn't exist
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# Determine monitoring method
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if command -v journalctl &> /dev/null && systemctl is-active --quiet sshd 2>/dev/null; then
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echo "Starting SSH login monitor (using journalctl)..."
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fenrirSay "SSH login monitor started."
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# Use journalctl for real-time monitoring
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trap 'fenrirSay "SSH login monitor stopped."; exit 0' INT TERM
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monitorJournalctl
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elif [[ -f "$logFile" ]]; then
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echo "Starting SSH login monitor (using auth.log)..."
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fenrirSay "SSH login monitor started."
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# Use auth.log polling
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trap 'fenrirSay "SSH login monitor stopped."; rm -f "$stateFile"; exit 0' INT TERM
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while true; do
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monitorAuthLog
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sleep "$checkInterval"
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done
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else
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echo "Error: Cannot find SSH logs. Neither journalctl nor ${logFile} is available."
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exit 1
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fi
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