[inventec] Replace os.system and remove subprocess with shell=True (#12108)

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
1. `getstatusoutput` is used without a static string and it uses `shell=True`
2. `subprocess()` - when using with `shell=True` is dangerous. Using subprocess function without a static string can lead to command injection.
3. `os` - not secure against maliciously constructed input and dangerous if used to evaluate dynamic content.
#### How I did it
1. use `getstatusoutput` without shell=True
2. `subprocess()` - use `shell=False` instead. use an array string. Ref: [https://semgrep.dev/docs/cheat-sheets/python-command-injection/#mitigation](https://semgrep.dev/docs/cheat-sheets/python-command-injection/#mitigation)
3. `os` - use with `subprocess`

Author: maipbui

platform/broadcom/sonic-platform-modules-inventec/common/utils/asic_monitor.py

@@ -17,13 +17,11 @@
 
 try:
     import os
-    import commands
-    import sys, getopt
-    import logging
     import re
     import time
     import syslog
     from sonic_sfp.bcmshell import bcmshell
+    from sonic_py_common.general import getstatusoutput_noshell
 
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))
@@ -53,10 +51,10 @@ def initialLoop():
             bcm_obj = BCMUtil()
             bcm_obj.execute_command("echo")
             initialNotOK = False
-            print bcm_obj
+            print(bcm_obj)
             log_message( syslog.LOG_INFO, "BCMUtil Object initialed successfully" )  
-        except Exception, e:   
-            print "Exception. The warning is {0}".format(str(e)) 
+        except Exception as e:   
+            print("Exception. The warning is {0}".format(str(e)))
             time.sleep(10)
 
 class BCMUtil(bcmshell):
@@ -66,7 +64,7 @@ class BCMUtil(bcmshell):
 
     def get_platform(self):
         if self.platform is None:
-            self.platform = os.popen("uname -n").read().strip()
+            _, self.platform = getstatusoutput_noshell(["uname", "-n"]).strip()
         return self.platform
 
     def get_asic_temperature( self ):
@@ -102,14 +100,18 @@ def main():
                         content = readPtr.read().strip()
                         if bcm_obj.get_platform() == INV_SEQUOIA_PLATFORM :
                             if content == "inv_bmc" and SWITCH_TEMP_FILE_NAME in file_list :
-                                os.system("echo {0} > {1}/{2}/device/{3}".format( ( bcm_obj.get_asic_temperature() * 1000 ), HWMON_PATH, index, SWITCH_TEMP_FILE_NAME ))
+                                file = "{0}/{1}/device/{2}".format(HWMON_PATH, index, SWITCH_TEMP_FILE_NAME)
+                                with open(file, 'w') as f:
+                                    f.write(str(bcm_obj.get_asic_temperature() * 1000) + '\n')
                                 break
                         else :
                             if content == "inv_psoc" and SWITCH_TEMP_FILE_NAME in file_list :
-                                print "echo {0} > {1}/{2}/device/{3}".format( ( bcm_obj.get_asic_temperature() * 1000 ), HWMON_PATH, index, SWITCH_TEMP_FILE_NAME )
-                                os.system("echo {0} > {1}/{2}/device/{3}".format( ( bcm_obj.get_asic_temperature() * 1000 ), HWMON_PATH, index, SWITCH_TEMP_FILE_NAME ))
+                                print("echo {0} > {1}/{2}/device/{3}".format( ( bcm_obj.get_asic_temperature() * 1000 ), HWMON_PATH, index, SWITCH_TEMP_FILE_NAME))
+                                file = "{0}/{1}/device/{2}".format(HWMON_PATH, index, SWITCH_TEMP_FILE_NAME)
+                                with open(file, 'w') as f:
+                                    f.write(str(bcm_obj.get_asic_temperature() * 1000) + '\n')
                                 break
-        except Exception, e:
+        except Exception as e:
             log_message( syslog.LOG_WARNING, "Exception. The warning is {0}".format(str(e)) )
             initialLoop()            
         time.sleep(5)

platform/broadcom/sonic-platform-modules-inventec/common/utils/led_proc.py

@@ -20,6 +20,7 @@
 import syslog
 import re
 from sonic_sfp.bcmshell import bcmshell
+from sonic_py_common.general import getstatusoutput_noshell
 
 
 # =====================================================================
@@ -120,8 +121,8 @@ def _board_init():
     global SYNC_S
     global SYNC_P
 
-    cmd = "uname -n"
-    platform = os.popen(cmd).read()
+    cmd = ["uname", "-n"]
+    _, platform = getstatusoutput_noshell(cmd)
 
     if platform.rstrip() == INV_MAGNOLIA:
         BOARD_TPYE      = "inventec_d6254qs"

platform/broadcom/sonic-platform-modules-inventec/common/utils/platform_status.py

@@ -2,6 +2,7 @@
 
 import os
 import socket
+import subprocess
 from collections import OrderedDict
 
 # Purpose:  Shutdown DUT upon receiving thermaltrip event from kernel (inv_pthread)
@@ -59,6 +60,6 @@ def next_events(self):
 
             # Receive thermaltrip event
             if event['ACTION'] == 'remove' and event['DEVPATH'] == '/kernel/platform_status/fan':
-                os.system("shutdown -h now")
+                subprocess.call(["shutdown", "-h", "now"])
 
 

platform/broadcom/sonic-platform-modules-inventec/common/utils/transceiver_monitor.py

@@ -28,6 +28,7 @@
     import syslog
     from sfputil import SfpUtil
     from sonic_sfp.bcmshell import bcmshell
+    from sonic_py_common.general import getstatusoutput_noshell
 
 except ImportError as e:
     raise ImportError("%s - required module not found" % str(e))
@@ -127,7 +128,7 @@ class BCMUtil(bcmshell):
 
     def get_platform(self):
         if self.platform is None:
-            self.platform = os.popen("uname -n").read().strip()
+            _, self.platform = getstatusoutput_noshell(["uname", "-n"])
         return self.platform
 
     def get_port_to_bcm_mapping(self):  

platform/broadcom/sonic-platform-modules-inventec/d6332/sonic_platform/qsfp.py

@@ -8,6 +8,7 @@
 try:
     import os
     import logging
+    import subprocess
     from ctypes import create_string_buffer
     from sonic_platform_base.sfp_base import SfpBase
     from sonic_platform_base.sonic_sfp.sff8436 import sff8436Dom
@@ -120,7 +121,7 @@ def __set_attr_value(self, attr_path, value):
         return True
 
     def __is_host(self):
-        return os.system("docker > /dev/null 2>&1") == 0
+        return subprocess.call(["docker"]) == 0
 
     def __get_path_to_port_config_file(self):
         host_platform_root_path = '/usr/share/sonic/device'

platform/broadcom/sonic-platform-modules-inventec/d6332/utils/inventec_d6332_util.py

@@ -33,6 +33,7 @@
 import logging
 import syslog
 import time
+from sonic_py_common.general import getstatusoutput_noshell_pipe
 
 DEBUG = False
 args = []
@@ -236,8 +237,9 @@ def system_install(boot_option):
 	      return status
     for addr_offset in range (0,FAN_NUM):
         addr=FAN_VPD_ADDR_BASE+addr_offset
-        cmd = "i2cdetect -y "+str(FAN_VPD_CHANNEL)+" "+str(addr)+" "+str(addr)+" | grep "+str(hex(addr)).replace('0x','')
-        result=os.system(cmd)
+        cmd1 = ["i2cdetect", "-y", str(FAN_VPD_CHANNEL), str(addr), str(addr)]
+        cmd2 = ["grep", f'{addr:x}']
+        result, _ = getstatusoutput_noshell_pipe(cmd1, cmd2)
         if( result==0 ):
             cmd="echo inv_eeprom "+str(addr)+" > /sys/bus/i2c/devices/i2c-"+FAN_VPD_CHANNEL
             status, output = exec_cmd(cmd,1)

platform/broadcom/sonic-platform-modules-inventec/d6356/sonic_platform/qsfp.py

@@ -9,6 +9,7 @@
     import os
     import sys
     import time
+    import subprocess
     from sonic_platform_base.sfp_base import SfpBase
     from sonic_platform_base.sonic_sfp.sff8436 import sff8436Dom
     from sonic_platform_base.sonic_sfp.sff8436 import sff8436InterfaceId
@@ -108,7 +109,7 @@ def __get_attr_value(self, attr_path):
         return retval
 
     def __is_host(self):
-        return os.system("docker > /dev/null 2>&1") == 0
+        return subprocess.call(["docker"]) == 0
 
     def __get_path_to_port_config_file(self):
         host_platform_root_path = '/usr/share/sonic/device'

platform/broadcom/sonic-platform-modules-inventec/d6356/sonic_platform/sfp.py

@@ -7,7 +7,7 @@
 
 try:
     import os
-    import sys
+    import subprocess
     from sonic_platform_base.sfp_base import SfpBase
     from sonic_platform_base.sonic_sfp.sff8472 import sff8472Dom
     from sonic_platform_base.sonic_sfp.sff8472 import sff8472InterfaceId
@@ -95,7 +95,7 @@ def __get_attr_value(self, attr_path):
         return retval
 
     def __is_host(self):
-        return os.system("docker > /dev/null 2>&1") == 0
+        return subprocess.call(["docker"]) == 0
 
     def __get_path_to_port_config_file(self):
         host_platform_root_path = '/usr/share/sonic/device'

platform/broadcom/sonic-platform-modules-inventec/d7054q28b/sonic_platform/sfp.py

@@ -153,7 +153,7 @@ class Sfp(SfpBase):
     # Path to QSFP sysfs
     PLATFORM_ROOT_PATH = "/usr/share/sonic/device"
     PMON_HWSKU_PATH = "/usr/share/sonic/hwsku"
-    HOST_CHK_CMD = "docker > /dev/null 2>&1"
+    HOST_CHK_CMD = ["docker"]
 
     PLATFORM = "x86_64-inventec_d7054q28b-r0"
     HWSKU  = "INVENTEC-D7054Q28B-S48-Q6"
@@ -285,7 +285,7 @@ def __read_txt_file(self, file_path):
         return ""
 
     def __is_host(self):
-        return os.system(self.HOST_CHK_CMD) == 0
+        return subprocess.call(self.HOST_CHK_CMD) == 0
 
     def __get_path_to_port_config_file(self):
         platform_path = "/".join([self.PLATFORM_ROOT_PATH, self.PLATFORM])