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xmir-patcher
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Implement comprehensive SSH persistence fixes

Browse Source 
Co-authored-by: longzheng268 <38132402+longzheng268@users.noreply.github.com>
pull/116/head
copilot-swe-agent[bot] 1 month ago
parent cf4a42e2c9
commit c59828fc0b
4 changed files with 272 additions and 59 deletions
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49
data/ssh_install.sh
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@ -11,23 +11,50 @@ fi
mv -f /tmp/ssh_patch.sh $DIR_PATCH/
chmod +x $DIR_PATCH/ssh_patch.sh
# Set nvram settings
nvram set ssh_en=1
nvram commit
INSTALL_METHOD=2
if [ $INSTALL_METHOD = 1 ]; then
FILE_FOR_EDIT=/etc/crontabs/root
grep -v "/ssh_patch.sh" $FILE_FOR_EDIT > $FILE_FOR_EDIT.new
echo "*/1 * * * * /etc/crontabs/patches/ssh_patch.sh >/dev/null 2>&1" >> $FILE_FOR_EDIT.new
mv $FILE_FOR_EDIT.new $FILE_FOR_EDIT
/etc/init.d/cron restart
fi
if [ $INSTALL_METHOD = 2 ]; then
# Method 1: UCI firewall hook (primary method)
uci set firewall.auto_ssh_patch=include
uci set firewall.auto_ssh_patch.type='script'
uci set firewall.auto_ssh_patch.path="$DIR_PATCH/ssh_patch.sh"
uci set firewall.auto_ssh_patch.enabled='1'
uci commit firewall
# Method 2: Cron job as backup (runs every 5 minutes)
FILE_CRON=/etc/crontabs/root
if [ -f "$FILE_CRON" ]; then
# Remove any existing ssh_patch entries
grep -v "/ssh_patch.sh" $FILE_CRON > $FILE_CRON.new || echo "" > $FILE_CRON.new
# Add new entry that runs every 5 minutes
echo "*/5 * * * * $DIR_PATCH/ssh_patch.sh >/dev/null 2>&1" >> $FILE_CRON.new
mv $FILE_CRON.new $FILE_CRON
/etc/init.d/cron restart
fi
# Method 3: Create an additional init script as backup
INIT_SCRIPT=/etc/init.d/ssh_persistent
cat > $INIT_SCRIPT << 'EOF'
#!/bin/sh /etc/rc.common
START=19
STOP=89
start() {
DIR_PATCH=/etc/crontabs/patches
if [ -x "$DIR_PATCH/ssh_patch.sh" ]; then
$DIR_PATCH/ssh_patch.sh &
fi
}
stop() {
return 0
}
EOF
chmod +x $INIT_SCRIPT
$INIT_SCRIPT enable
# Run the patch immediately
$DIR_PATCH/ssh_patch.sh

31
data/ssh_patch.sh
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@ -1,18 +1,45 @@
#!/bin/sh
[ -e "/tmp/ssh_patch.log" ] && return 0
# Check if SSH is already working properly
if [ -f "/tmp/ssh_patch.log" ]; then
# Verify SSH is still enabled and running
SSH_EN=`nvram get ssh_en`
if [ "$SSH_EN" = "1" ] && pgrep dropbear >/dev/null 2>&1; then
return 0
fi
# If verification fails, continue with patching
rm -f /tmp/ssh_patch.log
fi
# Ensure nvram SSH setting is enabled
SSH_EN=`nvram get ssh_en`
if [ "$SSH_EN" != "1" ]; then
nvram set ssh_en=1
nvram commit
fi
# Patch dropbear init script to bypass release channel check
if grep -q '= "release"' /etc/init.d/dropbear ; then
sed -i 's/= "release"/= "XXXXXX"/g' /etc/init.d/dropbear
fi
# Additional hardening: ensure dropbear service is enabled and configured
/etc/init.d/dropbear enable
# Ensure dropbear is running - restart if necessary
if ! pgrep dropbear >/dev/null 2>&1; then
/etc/init.d/dropbear start
else
/etc/init.d/dropbear restart
fi
# Wait a moment for service to start
sleep 2
echo "ssh enabled" > /tmp/ssh_patch.log
# Verify SSH is actually working
if pgrep dropbear >/dev/null 2>&1; then
echo "ssh enabled - $(date)" > /tmp/ssh_patch.log
else
echo "ssh patch failed - $(date)" > /tmp/ssh_patch.log
exit 1
fi

14
data/ssh_uninstall.sh
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@ -2,15 +2,29 @@
DIR_PATCH=/etc/crontabs/patches
# Method 1: Remove cron job entries
if grep -q '/ssh_patch.sh' /etc/crontabs/root ; then
# remove older version of patch
grep -v "/ssh_patch.sh" /etc/crontabs/root > /etc/crontabs/root.new
mv /etc/crontabs/root.new /etc/crontabs/root
/etc/init.d/cron restart
fi
# Method 2: Remove UCI firewall hook
if uci -q get firewall.auto_ssh_patch ; then
uci delete firewall.auto_ssh_patch
uci commit firewall
fi
# Method 3: Remove init script
INIT_SCRIPT=/etc/init.d/ssh_persistent
if [ -f "$INIT_SCRIPT" ]; then
$INIT_SCRIPT disable
$INIT_SCRIPT stop
rm -f $INIT_SCRIPT
fi
# Clean up files
rm -f $DIR_PATCH/ssh_patch.sh
rm -f /tmp/ssh_patch.log

181
install_ssh.py
Unescape Escape View File

@ -23,22 +23,50 @@ fn_uninstall = '/tmp/ssh_uninstall.sh'
os.makedirs('tmp', exist_ok = True)
ssh_patch = '''#!/bin/sh
[ -e "/tmp/ssh_patch.log" ] && return 0
# Check if SSH is already working properly
if [ -f "/tmp/ssh_patch.log" ]; then
# Verify SSH is still enabled and running
SSH_EN=`nvram get ssh_en`
if [ "$SSH_EN" = "1" ] && pgrep dropbear >/dev/null 2>&1; then
return 0
fi
# If verification fails, continue with patching
rm -f /tmp/ssh_patch.log
fi
# Ensure nvram SSH setting is enabled
SSH_EN=`nvram get ssh_en`
if [ "$SSH_EN" != "1" ]; then
nvram set ssh_en=1
nvram commit
fi
# Patch dropbear init script to bypass release channel check
if grep -q '= "release"' /etc/init.d/dropbear ; then
sed -i 's/= "release"/= "XXXXXX"/g' /etc/init.d/dropbear
fi
# Additional hardening: ensure dropbear service is enabled and configured
/etc/init.d/dropbear enable
# Ensure dropbear is running - restart if necessary
if ! pgrep dropbear >/dev/null 2>&1; then
/etc/init.d/dropbear start
else
/etc/init.d/dropbear restart
fi
# Wait a moment for service to start
sleep 2
echo "ssh enabled" > /tmp/ssh_patch.log
# Verify SSH is actually working
if pgrep dropbear >/dev/null 2>&1; then
echo "ssh enabled - $(date)" > /tmp/ssh_patch.log
else
echo "ssh patch failed - $(date)" > /tmp/ssh_patch.log
exit 1
fi
'''
with open(FN_patch, 'w', newline = '\n') as file:
file.write(ssh_patch)
@ -55,16 +83,52 @@ fi
mv -f /tmp/ssh_patch.sh $DIR_PATCH/
chmod +x $DIR_PATCH/ssh_patch.sh
# Set nvram settings
nvram set ssh_en=1
nvram commit
# Method 1: UCI firewall hook (primary method)
uci set firewall.auto_ssh_patch=include
uci set firewall.auto_ssh_patch.type='script'
uci set firewall.auto_ssh_patch.path="$DIR_PATCH/ssh_patch.sh"
uci set firewall.auto_ssh_patch.enabled='1'
uci commit firewall
rm -f /tmp/ssh_patch.log
# Method 2: Cron job as backup (runs every 5 minutes)
FILE_CRON=/etc/crontabs/root
if [ -f "$FILE_CRON" ]; then
# Remove any existing ssh_patch entries
grep -v "/ssh_patch.sh" $FILE_CRON > $FILE_CRON.new || echo "" > $FILE_CRON.new
# Add new entry that runs every 5 minutes
echo "*/5 * * * * $DIR_PATCH/ssh_patch.sh >/dev/null 2>&1" >> $FILE_CRON.new
mv $FILE_CRON.new $FILE_CRON
/etc/init.d/cron restart
fi
# Method 3: Create an additional init script as backup
INIT_SCRIPT=/etc/init.d/ssh_persistent
cat > $INIT_SCRIPT << 'EOF'
#!/bin/sh /etc/rc.common
START=19
STOP=89
start() {
DIR_PATCH=/etc/crontabs/patches
if [ -x "$DIR_PATCH/ssh_patch.sh" ]; then
$DIR_PATCH/ssh_patch.sh &
fi
}
stop() {
return 0
}
EOF
chmod +x $INIT_SCRIPT
$INIT_SCRIPT enable
# Run the patch immediately
$DIR_PATCH/ssh_patch.sh
### bdata_patch ###
@ -73,50 +137,104 @@ with open(FN_install, 'w', newline = '\n') as file:
file.write(ssh_install)
bdata_patch = '''
# Enhanced bdata persistence patch
rm -f /tmp/bdata_patch.log
TELNET_EN=`bdata get telnet_en`
SSH_EN=`bdata get ssh_en`
UART_EN=`bdata get uart_en`
if [ "$TELNET_EN" != "1" -o "$SSH_EN" != "1" -o "$UART_EN" != "1" ]; then
echo "Starting bdata patch..." > /tmp/bdata_patch.debug
# Check current bdata settings
TELNET_EN=`bdata get telnet_en 2>/dev/null || echo ""`
SSH_EN=`bdata get ssh_en 2>/dev/null || echo ""`
UART_EN=`bdata get uart_en 2>/dev/null || echo ""`
echo "Current bdata: telnet_en=$TELNET_EN ssh_en=$SSH_EN uart_en=$UART_EN" >> /tmp/bdata_patch.debug
# Always attempt to patch bdata for maximum persistence - don't skip if already set
KMOD_FN=/tmp/xmir_patcher.ko
if [ -f $KMOD_FN ]; then
echo "Loading xmir_patcher module..." >> /tmp/bdata_patch.debug
insmod $KMOD_FN
sleep 1
if lsmod | grep -q xmir_patcher ; then
echo "Module loaded successfully" >> /tmp/bdata_patch.debug
# Try bdata partition name (lowercase)
echo 'set_mtd_rw|bdata' > /sys/module/xmir_patcher/parameters/cmd
RESP=`cat /sys/module/xmir_patcher/parameters/cmd`
echo "bdata partition response: $RESP" >> /tmp/bdata_patch.debug
# If lowercase fails, try Bdata (uppercase)
if [ "${RESP::2}" != "0|" ]; then
echo 'set_mtd_rw|Bdata' > /sys/module/xmir_patcher/parameters/cmd
RESP=`cat /sys/module/xmir_patcher/parameters/cmd`
echo "Bdata partition response: $RESP" >> /tmp/bdata_patch.debug
fi
if [ "${RESP::2}" = "0|" ]; then
bdata set telnet_en=1
bdata set ssh_en=1
bdata set uart_en=1
bdata commit
echo OK > /tmp/bdata_patch.log
echo "Partition writable, setting bdata values..." >> /tmp/bdata_patch.debug
# Set all required values
bdata set telnet_en=1 2>&1 >> /tmp/bdata_patch.debug
bdata set ssh_en=1 2>&1 >> /tmp/bdata_patch.debug
bdata set uart_en=1 2>&1 >> /tmp/bdata_patch.debug
# Commit changes
if bdata commit 2>&1 >> /tmp/bdata_patch.debug ; then
echo "OK" > /tmp/bdata_patch.log
echo "bdata commit successful" >> /tmp/bdata_patch.debug
else
echo "error_commit" > /tmp/bdata_patch.log
echo "bdata commit failed" >> /tmp/bdata_patch.debug
fi
[ ! -f /tmp/bdata_patch.log ] && echo error_3 > /tmp/bdata_patch.log
else
echo "error_partition_not_writable" > /tmp/bdata_patch.log
echo "Failed to make partition writable" >> /tmp/bdata_patch.debug
fi
[ ! -f /tmp/bdata_patch.log ] && echo error_2 > /tmp/bdata_patch.log
# Clean up module
rmmod xmir_patcher 2>/dev/null
else
echo "error_module_load" > /tmp/bdata_patch.log
echo "Failed to load xmir_patcher module" >> /tmp/bdata_patch.debug
fi
[ ! -f /tmp/bdata_patch.log ] && echo error_1 > /tmp/bdata_patch.log
else
echo "error_module_missing" > /tmp/bdata_patch.log
echo "xmir_patcher module file not found" >> /tmp/bdata_patch.debug
fi
# Verify final state
TELNET_EN_FINAL=`bdata get telnet_en 2>/dev/null || echo ""`
SSH_EN_FINAL=`bdata get ssh_en 2>/dev/null || echo ""`
UART_EN_FINAL=`bdata get uart_en 2>/dev/null || echo ""`
echo "Final bdata: telnet_en=$TELNET_EN_FINAL ssh_en=$SSH_EN_FINAL uart_en=$UART_EN_FINAL" >> /tmp/bdata_patch.debug
'''
ssh_uninstall = '''#!/bin/sh
DIR_PATCH=/etc/crontabs/patches
# Method 1: Remove cron job entries
if grep -q '/ssh_patch.sh' /etc/crontabs/root ; then
# remove older version of patch
grep -v "/ssh_patch.sh" /etc/crontabs/root > /etc/crontabs/root.new
mv /etc/crontabs/root.new /etc/crontabs/root
/etc/init.d/cron restart
fi
# Method 2: Remove UCI firewall hook
if uci -q get firewall.auto_ssh_patch ; then
uci delete firewall.auto_ssh_patch
uci commit firewall
fi
# Method 3: Remove init script
INIT_SCRIPT=/etc/init.d/ssh_persistent
if [ -f "$INIT_SCRIPT" ]; then
$INIT_SCRIPT disable
$INIT_SCRIPT stop
rm -f $INIT_SCRIPT
fi
# Clean up files
rm -f $DIR_PATCH/ssh_patch.sh
rm -f /tmp/ssh_patch.log
'''
@ -134,15 +252,19 @@ if bdata and bdata.var:
ssh_en = bdata.var["ssh_en"] if 'ssh_en' in bdata.var else None
uart_en = bdata.var["uart_en"] if 'uart_en' in bdata.var else None
print(f'bdata: telnet_en = {telnet_en}, ssh_en = {ssh_en}, uart_en = {uart_en}')
if telnet_en != '1' or ssh_en != '1' or uart_en != '1':
# Check if we have the capability to apply bdata patch
print(f'CPU arch: {dev.info.cpu_arch}')
print(f'Kernel: {dev.info.linux_stamp}')
krn_version = dev.info.linux_ver.strip()
krn_ver = krn_version.split('.')
kver = krn_ver[0] + '.' + krn_ver[1]
arch = dev.info.cpu_arch
if kver in [ '4.4', '5.4' ] and arch in [ 'armv7', 'arm64' ]:
print(f'Insert patch for bdata partition!')
# Always try to apply bdata patch for maximum persistence
# Even if values appear correct, they might not persist across firmware updates
print(f'Applying bdata partition patch for enhanced persistence!')
preempt = '-preempt' if 'PREEMPT' in dev.info.linux_stamp else ''
FN_kmod = FN_kmod.format(kver = kver, arch = arch, preempt = preempt)
if not os.path.exists(FN_kmod):
@ -206,10 +328,33 @@ gw.run_cmd(f"rm -f {fn_patch} ; rm -f {fn_install} ; rm -f {fn_uninstall}")
print("Ready! The Permanent SSH patch installed.")
if FN_bdata_log:
fn_bdata_debug = '/tmp/bdata_patch.debug'
FN_bdata_debug = 'tmp/bdata_patch.debug'
# Download both log and debug files
gw.download(fn_bdata_log, FN_bdata_log, verbose = 0)
gw.download(fn_bdata_debug, FN_bdata_debug, verbose = 0)
if not os.path.exists(FN_bdata_log):
print(f'WARN: Patch for bdata partition not executed!')
else:
with open(FN_bdata_log, 'r') as file:
res = file.read()
res = file.read().strip()
print(f'Patch for bdata result: {res}')
if res == 'OK':
print('SUCCESS: bdata partition patched successfully - SSH should persist across reboots')
else:
print(f'WARNING: bdata patch failed with result: {res}')
if os.path.exists(FN_bdata_debug):
print('Debug information:')
with open(FN_bdata_debug, 'r') as file:
debug_info = file.read()
print(debug_info)
print('SSH may still work but persistence across firmware updates is not guaranteed')
print("SSH persistence mechanisms installed:")
print("1. UCI firewall hook (primary)")
print("2. Cron job backup (every 5 minutes)")
print("3. Init script backup (on boot)")
print("Multiple redundant mechanisms ensure maximum persistence!")

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