[device/juniper] Mitigation for security vulnerability (sonic-net#11838)

Signed-off-by: maipbui maibui@microsoft.com
Dependency: [https://github.com/sonic-net/sonic-buildimage/pull/12065](https://github.com/sonic-net/sonic-buildimage/pull/12065)
#### Why I did it
`commands` module is not secure
command injection in `getstatusoutput` being used without a static string
#### How I did it
Eliminate `commands` module, use `subprocess` module only
Convert Python 2 to Python 3

device/juniper/x86_64-juniper_qfx5200-r0/plugins/qfx5200_eeprom_data.py

@@ -34,13 +34,9 @@
 
 import binascii
 import os
-import sys
+import subprocess
 from sonic_eeprom import eeprom_tlvinfo
-
-if sys.version_info[0] < 3:
-    import commands
-else:
-    import subprocess as commands
+from sonic_py_common.general import getstatusoutput_noshell
 
 
 def fantype_detect():
@@ -56,9 +52,7 @@ def fantype_detect():
     for filename in os.listdir(refpgaTMC_path):
         if filename.endswith('_type'):
             fantype_path = os.path.join(refpgaTMC_path, filename)
-            cat_string = "cat "
-            fantype_string = cat_string + fantype_path
-            status, fan_type = commands.getstatusoutput(fantype_string)
+            status, fan_type = getstatusoutput_noshell(['cat', fantype_path])
             if ((fan_type == AFO) or (fan_type == AFI)):
                 return fan_type
             else:
@@ -176,17 +170,21 @@ def main():
     eeprom_file.write("Main board eeprom (0x57)\r\n")
     eeprom_file.write("===============================\r\n")
 
-    MainEepromCreate = 'sudo echo 24c02 0x57 > /sys/bus/i2c/devices/i2c-0/new_device'
+    MainEepromCreate = '24c02 0x57'
+    out_file = '/sys/bus/i2c/devices/i2c-0/new_device'
     # Write the contents of Main Board EEPROM to file
     try:
-        os.system(MainEepromCreate)
+        with open(out_file, 'w') as file:
+            file.write(MainEepromCreate)
     except OSError:
         print('Error: Execution of "%s" failed', MainEepromCreate)
         return False
 
-    MainEepromFileCmd = 'cat /sys/bus/i2c/devices/i2c-0/0-0057/eeprom > /etc/init.d/MainEeprom_qfx5200_ascii'
+    MainEepromFileCmd = ['cat', '/sys/bus/i2c/devices/i2c-0/0-0057/eeprom']
+    out_file = '/etc/init.d/MainEeprom_qfx5200_ascii'
     try:
-        os.system(MainEepromFileCmd)
+        with open(out_file, 'w') as file:
+            subprocess.call(MainEepromFileCmd, universal_newlines=True, stdout=file)
     except OSError:
         print('Error: Execution of "%s" failed', MainEepromFileCmd)
         return False

device/juniper/x86_64-juniper_qfx5210-r0/plugins/qfx5210_eeprom_data.py

@@ -32,8 +32,8 @@
 # components is subject to the terms and conditions of the respective license
 # as noted in the Third-Party source code file.
 
-import os
 import binascii
+import subprocess
 from sonic_eeprom import eeprom_tlvinfo
 
 
@@ -81,10 +81,12 @@ def main():
     eeprom_file.write("Vendor Name=%s\r\n" % eeprom_qfx5210.vendor_name_str())
     eeprom_file.write("Manufacture Name=%s\r\n" % eeprom_qfx5210.manufacture_name_str())
 
-    CPUeepromFileCmd = 'cat /sys/devices/pci0000:00/0000:00:1f.3/i2c-0/0-0056/eeprom > /etc/init.d/eeprom_qfx5210_ascii'
+    CPUeepromFileCmd = ['cat', '/sys/devices/pci0000:00/0000:00:1f.3/i2c-0/0-0056/eeprom']
     # Write the contents of CPU EEPROM to file
+    out_file = '/etc/init.d/eeprom_qfx5210_ascii'
     try:
-        os.system(CPUeepromFileCmd)
+        with open(out_file, 'w') as file:
+            subprocess.call(CPUeepromFileCmd, universal_newlines=True, stdout=file)
     except OSError:
         print('Error: Execution of "%s" failed', CPUeepromFileCmd)
         return False

platform/broadcom/sonic-platform-modules-juniper/qfx5200/utils/juniper_qfx5200_monitor.py

@@ -34,14 +34,14 @@
 
 try:
     import os
-    import commands
     import subprocess
     import logging
     import logging.config
     import logging.handlers
     import time
     import glob
     import re
+    from sonic_py_common.general import getstatusoutput_noshell
 except ImportError as e:
     raise ImportError('%s - required module not found' % str(e))
 
@@ -172,24 +172,27 @@ def get_fan_dutycycle(self):
 	    pwm_value = 0
 	    pwm_value1 = 0
             device_path = self._pwm_input_path_mapping[x]
-            cmd = ("sudo cat %s" %(device_path))
-            status, pwm_value = commands.getstatusoutput(cmd)
+            cmd = ["sudo", "cat", device_path]
+            status, pwm_value = getstatusoutput_noshell(cmd)
 	    pwm_value1 = int(pwm_value)
 	    time.sleep(0.25)
 	    if int(pwm_value1) > 0:
 	        ret_value = fan_speed.get(int(pwm_value))
 	        break
 
         return int(ret_value)	
+
+    def write_file(self, text, file):
+        with open(file, 'w') as f:
+            f.write(text + '\n')
 
     def set_fan_dutycycle(self, val):
         fan_speed = {35: 86, 55: 139, 75: 192, 90: 230,100: 255}
         for x in range(self.PWMINPUT_NUM):
             device_path = self._pwm_input_path_mapping[x]
             pwm_value = fan_speed.get(val)
             pwm_value1 = str(pwm_value)
-            cmd = ("sudo echo %s > %s" %(pwm_value1,device_path))
-            os.system(cmd)
+            self.write_file(pwm_value1,device_path)
             time.sleep(0.25)
 	logging.debug('Setting PWM value: %s to all fans', pwm_value1)
         return True
@@ -198,8 +201,8 @@ def get_check_fan_dutycycle(self):
 	pwm_str = ''    
 	for x in range(self.PWMINPUT_NUM):
             device_path = self._pwm_input_path_mapping[x]
-            cmd = ("sudo cat %s" %(device_path))
-            status, pwm_value = commands.getstatusoutput(cmd)
+            cmd = ["sudo", "cat", device_path]
+            status, pwm_value = getstatusoutput_noshell(cmd)
 	    pwm_str += pwm_value
             if (x != self.PWMINPUT_NUM -1):		   
 	        pwm_str += ', '
@@ -495,8 +498,8 @@ def getSensorTemp(self):
             else:
                 proc = subprocess.Popen("bcmcmd \"show temp\" | grep \"maximum peak temperature\" | awk '{ print $5 }' > /var/log/asic_value 2>&1 & ",shell=True)
                 time.sleep(2)
-                cmd = "kill -9 %s"%(proc.pid)
-                commands.getstatusoutput(cmd)
+                cmd = ["kill", "-9", proc.pid]
+                getstatusoutput_noshell(cmd)
 
                 if os.stat("/var/log/asic_value").st_size == 0:
                     value = PrevASICValue
@@ -568,7 +571,7 @@ def getSensorTemp(self):
             or SensorFlag[8][11] or SensorFlag[9][11] or SensorFlag[10][11] or SensorFlag[11][11]):
 
             logging.debug('Fire Threshold reached: System is going to shutdown now')
-            os.system("echo 'CRITICAL: Fire Threshold reached: System is going to shutdown now' > /dev/console")
+            self.write_file('CRITICAL: Fire Threshold reached: System is going to shutdown now', "/dev/console")
 
 
             logging.debug('Executing poweroff command')
@@ -583,8 +586,8 @@ def getSensorTemp(self):
 
             monitorlog_file.close()
 
-            cmd = "poweroff"
-	    os.system(cmd)
+            cmd = ["poweroff"]
+        subprocess.call(cmd)
 
         # CHECK IF ANY TEMPERATURE SENSORS is running at RED warning , IF YES, SET THE ALARM LED TO 'RED'
         elif (SensorFlag[0][10] or SensorFlag[1][10] or SensorFlag[2][10] or SensorFlag[3][10] or SensorFlag[4][10] or SensorFlag[5][10] or SensorFlag[6][10] or SensorFlag[7][10]
@@ -878,8 +881,7 @@ def set_Default_fan_dutycycle(self, val):
             pwm_value = fan_speed.get(val)
             pwm_value1 = str(pwm_value)
             time.sleep(0.25)
-            cmd = ("sudo echo %s > %s" %(pwm_value1,device_path))
-            os.system(cmd)
+            self.write_file(pwm_value1, device_path)
 
 	logging.debug('Setting Default PWM value: 86 to all fans')
 	return True
@@ -888,8 +890,8 @@ def get_Initial_fan_dutycycle(self):
 	pwm_str = ''    
 	for x in range(self.PWMINPUT_NUM):
             device_path = self._pwm_input_path_mapping[x]
-            cmd = ("sudo cat %s" %(device_path))
-            status, pwm_value = commands.getstatusoutput(cmd)
+            cmd = ["sudo", "cat", device_path]
+            status, pwm_value = getstatusoutput_noshell(cmd)
 	    pwm_str += pwm_value
             if (x != self.PWMINPUT_NUM -1):		   
 	        pwm_str += ', '

platform/broadcom/sonic-platform-modules-juniper/qfx5200/utils/juniper_qfx5200_util.py

@@ -23,15 +23,17 @@
 import sys
 import logging
 import time
+import subprocess
+from sonic_py_common.general import getstatusoutput_noshell
 
 PROJECT_NAME = 'QFX5200-32C'
 verbose = False
 DEBUG = False
 FORCE = 0
 
 if DEBUG == True:
-    print sys.argv[0]
-    print 'ARGV      :', sys.argv[1:]   
+    print(sys.argv[0])
+    print('ARGV      :', sys.argv[1:])   
 
 i2c_prefix = '/sys/bus/i2c/devices/'
 
@@ -70,7 +72,7 @@
 
 def my_log(txt):
     if DEBUG == True:
-        print txt    
+        print(txt)
     return
 
 def log_os_system(cmd, show):
@@ -83,6 +85,10 @@ def log_os_system(cmd, show):
         if show:
             print('Failed :'+cmd)
     return  status, output
+
+def write_file(text, file):
+    with open(file, 'w') as f:
+        f.write(text + '\n')
 
 def driver_install():
     global FORCE
@@ -106,7 +112,7 @@ def device_install():
     for i in range(0,len(mknod)):
         status, output = log_os_system(mknod[i], 1)
         if status:
-            print output
+            print(output)
             if FORCE == 0:
                 return status
 
@@ -123,7 +129,7 @@ def do_install():
             if FORCE == 0:        
                 return  status        
     else:
-        print PROJECT_NAME.upper()+" devices detected...."           
+        print(PROJECT_NAME.upper()+" devices detected....")
     return
 
 def main():
@@ -139,70 +145,71 @@ def main():
 
 
     # Enabling REFPGA	
-    EnableREFFGACmd = 'busybox devmem 0xFED50011 8 0x53' 
+    EnableREFFGACmd = ['busybox', 'devmem', '0xFED50011', '8', '0x53'] 
     try:
-        os.system(EnableREFFGACmd)
+        subprocess.call(EnableREFFGACmd)
     except OSError:
-        print 'Error: Execution of "%s" failed', EnableREFFGACmd
+        print('Error: Execution of "%s" failed', EnableREFFGACmd)
         return False
 
     time.sleep(2)
 
     # Create CPU Board EEPROM device	
-    CreateEEPROMdeviceCmd = 'sudo echo 24c02 0x51 > /sys/bus/i2c/devices/i2c-0/new_device' 
+    CreateEEPROMdeviceCmd = '24c02 0x51'
+    file = '/sys/bus/i2c/devices/i2c-0/new_device'
     try:
-        os.system(CreateEEPROMdeviceCmd)
+        write_file(CreateEEPROMdeviceCmd, file)
     except OSError:
-        print 'Error: Execution of "%s" failed', CreateEEPROMdeviceCmd
+        print('Error: Execution of "%s" failed', CreateEEPROMdeviceCmd)
         return False
 
     time.sleep(1)
 
     #Retrieve the Base MAC Address from EEPROM	
-    status, macAddress = commands.getstatusoutput("decode-syseeprom -m 0x24")
+    status, macAddress = getstatusoutput_noshell(["decode-syseeprom", "-m", "0x24"])
     if status:
-        print 'Error: Could not retrieve BASE MAC Address from EEPROM'
+        print('Error: Could not retrieve BASE MAC Address from EEPROM')
         return False
 
     #Make eth0 interface down	
-    status, eth0Down = commands.getstatusoutput("ifconfig eth0 down")
+    status, eth0Down = getstatusoutput_noshell(["ifconfig", "eth0", "down"])
     if status:
-        print 'Error: Could not make eth0 interface down'
+        print('Error: Could not make eth0 interface down')
         return False
 
     #Assign BASE MAC ADDRESS retieved from CPU board EEPROM to eth0 interface	
-    mac_address_prog = "ifconfig eth0 hw ether " + str(macAddress)
+    mac_address_prog = ["ifconfig", "eth0", "hw", "ether", str(macAddress)]
 
-    status, MACAddressProg = commands.getstatusoutput(mac_address_prog)
+    status, MACAddressProg = getstatusoutput_noshell(mac_address_prog)
     if status:
-        print 'Error: Could not set up "macAddress" for eth0 interface'
+        print('Error: Could not set up "macAddress" for eth0 interface')
         return False
 
     #Make eth0 interface up	
-    status, eth0UP = commands.getstatusoutput("ifconfig eth0 up")
+    status, eth0UP = getstatusoutput_noshell(["ifconfig", "eth0", "up"])
     if status:
-        print 'Error: Could not make eth0 interface up'
+        print('Error: Could not make eth0 interface up')
         return False
 
     # Juniper QFX5200 platform drivers install
     do_install()
     time.sleep(2)
 
     # Juniper SFP Intialization	
-    JuniperSFPInitCmd = 'python /usr/share/sonic/device/x86_64-juniper_qfx5200-r0/plugins/qfx5200_sfp_init.py'
+    JuniperSFPInitCmd = ['python', '/usr/share/sonic/device/x86_64-juniper_qfx5200-r0/plugins/qfx5200_sfp_init.py']
     try:
-        os.system(JuniperSFPInitCmd)
+        subprocess.call(JuniperSFPInitCmd)
     except OSError:
-        print 'Error: Execution of "%s" failed', JuniperSFPInitCmd
+        print('Error: Execution of "%s" failed', JuniperSFPInitCmd)
         return False
 
     time.sleep(1)
     # Invoking the script which retrieves the data from CPU Board and Main Board EEPROM and storing in file	
-    EEPROMDataCmd = 'python /usr/share/sonic/device/x86_64-juniper_qfx5200-r0/plugins/qfx5200_eeprom_data.py'
+    EEPROMDataCmd = ['python', '/usr/share/sonic/device/x86_64-juniper_qfx5200-r0/plugins/qfx5200_eeprom_data.py']
     try:
-        os.system(EEPROMDataCmd)
+        subprocess.call(EEPROMDataCmd)
     except OSError:
-        print 'Error: Execution of "%s" failed', EEPROMDataCmd
+        print('Error: Execution of "%s" failed', EEPROMDataCmd)
         return False
 
     for x in range(PWMINPUT_NUM):
@@ -218,16 +225,16 @@ def main():
 				                 hwmon_dir)
          device_path = pwm_input_path_mapping[x]
          time.sleep(1)
-         cmd = ("sudo echo 22500 > %s" %device_path)
-         os.system(cmd)
+         cmd = "22500"
+         write_file(cmd, device_path)
 
 	 numsensors_input_path_mapping[x] = NUMSENSORS_PATH.format(
 		                                 hwmon_input_node_mapping[x],
 				                 hwmon_dir)
          numsensors_path = numsensors_input_path_mapping[x]
          time.sleep(1)
-         cmd = ("sudo echo 0 > %s" %numsensors_path)
-         os.system(cmd)
+         cmd = "0"
+         write_file(cmd, numsensors_path)
 
     return True              
 

platform/broadcom/sonic-platform-modules-juniper/qfx5200/utils/show_thresholds

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import os
-import commands
+from sonic_py_common.general import getstatusoutput_noshell
 
 def fantype_detect():
 
@@ -15,9 +15,8 @@ def fantype_detect():
     for filename in os.listdir(refpgaTMC_path):
         if filename.endswith('_type'):
             fantype_path = os.path.join(refpgaTMC_path, filename)
-            cat_string = "cat "
-            fantype_string = cat_string + fantype_path
-            status,fan_type=commands.getstatusoutput(fantype_string)
+            fantype_string = ["cat", fantype_path]
+            status, fan_type = getstatusoutput_noshell(fantype_string)
             if ((fan_type == AFO) or (fan_type == AFI)):
                 return fan_type
             else: