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#!/usr/bin/env python2
"""
This module is a bridge between low-level logging services and high level handling dependency logic
"""
import os
import sys
import time
import tempfile
import socket
import select
import re
import logger_hooklib
import logger_fusefs
def unescape(s):
s=re.sub(r'\\r', '\r', s)
s=re.sub(r'\\n', '\n', s)
s=re.sub(r'\\(.)', r'\1', s)
return s
def parse_message(message):
ret=re.split(r"(?<![\\]) ",message,6)
#for i in ret:
return map(unescape, ret)
# check if proccess is finished
def checkfinished(pid):
if not os.path.exists("/proc/%d/stat" % pid):
return True
try:
pid_child,exitcode = os.waitpid(pid, os.WNOHANG)
except OSError, e:
if e.errno == 10:
return False
else:
raise
if pid_child==0:
return False
return True
#check if process is zombie
def iszombie(pid):
try:
statfile=open("/proc/%d/stat" % pid,"r")
line=statfile.readline()
statfile.close()
line=line.rsplit(")")[1] # find last ")" char
line=line.strip()
match=re.match(r"(\w)",line)
if match==None:
print "Failed to get check if process is zombie. Format of /proc/<pid>/stat is incorrect. Did you change a kernel?"
return False
return match.group(1)=="Z"
except IOError,e:
return True
# uses /proc filesystem to get pid of parent
def getparentpid(pid):
try:
statfile=open("/proc/%d/stat" % pid,"r")
line=statfile.readline()
statfile.close()
line=line.rsplit(")")[1] # find last ")" char
line=line.strip()
match=re.match(r"\w\s(\d+)",line)
if match==None:
print "Failed to get parent process. Format of /proc/<pid>/stat is incorrect. Did you change a kernel?"
return 1
return int(match.group(1))
except IOError,e:
return 1
#check if message came from one of a child
def checkparent(parent,child):
#print "Parent %s, child %s"%(parent,child)
if child==1 or getparentpid(child)==1:
return True
currpid=child
# for(pid=getpid();pid!=0;pid=__getparentpid(pid))
while getparentpid(currpid)!=1:
currpid=getparentpid(currpid)
if currpid==parent:
return True
print "External actions with filesystem detected pid of external prog is %d" % child
return False
# default access filter. Allow acess to all files
def defaultfilter(eventname, filename, pid):
return True
# run the program and get file access events
def getfsevents(prog_name,arguments,approach="hooklib",filterproc=defaultfilter):
events=[]
# generate a random socketname
tmpdir = tempfile.mkdtemp()
socketname = os.path.join(tmpdir, 'socket')
try:
sock_listen=socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock_listen.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock_listen.bind(socketname)
sock_listen.listen(65536*8)
except socket.error, e:
print "Failed to create a socket for exchange data with the logger: %s" % e
return []
else:
#print socketname
pid=os.fork()
if pid==0:
logger=None
if approach=="hooklib":
logger=logger_hooklib.logger(socketname)
elif approach=="fusefs":
logger=logger_fusefs.logger(socketname)
else:
print "Unknown logging approach"
sys.exit(1)
logger.execprog(prog_name,arguments)
# should not get here
print "Launch likely was unsuccessful"
sys.exit(1)
else:
input = [sock_listen]
connects = 0;
buffers = {}
while input:
inputready,outputready,exceptready = select.select(input,[],[],5)
for s in inputready:
#print "!! len: %d" % len(buffers)
if s == sock_listen:
ret = s.accept()
if ret is None:
pass
else:
(client,addr)=ret
connects+=1; # client accepted
input.append(client)
buffers[client]=''
else:
data=s.recv(4096)
buffers[s]+=data
if not data:
s.close()
input.remove(s)
buffers[s]=""
connects-=1;
if connects==0:
input.remove(sock_listen)
sock_listen.close()
continue
if not "\n" in buffers[s]:
continue
data,buffers[s] = buffers[s].rsplit("\n",1)
for record in data.split("\n"):
if len(record)==0:
continue
# TODO: check array
#print "!"+"%d"%len(record)+"?"
#print "datalen: %d" % len(data)
message=parse_message(record)
try:
if message[4]=="ASKING":
#print "ASKING %s"%message[2]
if message[2]=="/" or ( # always allow acces to "/" because of some processes like ksysguardd
True):#checkparent(pid,int(message[3])) and filterproc(message[1],message[2],message[3])):
s.sendall("ALLOW\n"); # TODO: think about flush here
#print "ALLOWING %s"%message[2]
else:
print "Blocking an access to %s" % message[2]
s.sendall("DENY\n"); # TODO: think about flush here
else:
# check previous five messages for possible repeats
for prevevent in events[-5:]:
if prevevent[1:]==message[1:]:
break
else:
pass
#events.append(message)
except IndexError:
print "IndexError while parsing %s"%record
#print "!!"+data+"!!"
#print parse_message(data)
if len(input)==1 and connects==0: #or
# seems like there is no connect
print "It seems like a logger module was unable to start or failed to finish" + \
"Check that you are not launching a suid program under non-root user."
return []
#if iszombie(pid):
# print "Child finished, but connection remains. Closing a connection"
# break
os.wait()
if len(events)==0:
return []
timeofstart=int(events[0][0])
# make all event times relative to time 0 - time of start task
for event_num in range(0,len(events)):
events[event_num][0]=int(events[event_num][0])-timeofstart
return events
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