I have the code to find the name of the 'access-class' on the 'line vty'
After that I am able to find the ACL but then I want to check each line of the ACL to verify that the 'deny' and 'permit' statements have the 'log' keyword. And print a report of OPEN if there is no 'log' statement or NOT A FINDING if there is a 'log' statement on the entry.
And this is where I am at a loss for how to parse through the ACL statements, whether I can use something from CiscoConfParse or more standard python to do the job?
#Importing the necessary modules.
import sys
from sys import argv
#Importing the necessary modules.
from ciscoconfparse import CiscoConfParse
import sys
import argparse
def check_VTY_ACL_NET1637():
## Search for LINE VTY access-list name then check if that ACL has log keyword
#
for VTY_ACL in parse.find_children_w_parents('line vty', 'access-class'):
#print(VTY_ACL[14])
VTY_ACL = VTY_ACL.lstrip('access-class ')
#print (VTY_ACL)
VTY_ACL_2 = VTY_ACL.rstrip(' in')
#print(VTY_ACL_R)
#has_ACL_in = VTY_ACL.find_lines(r'access-class')
#print(has_ACL_in)
#for IP_ACL_LIST in parse.find_objects_w_child(VTY_ACL_R, 'log'):
#for IP_ACL_LIST in parse.find_lines(VTY_ACL_R):
for IP_ACL_LIST in parse.find_parents_w_child(VTY_ACL_2, ''):
#print(IP_ACL_LIST)
#IP_ACL_ACE = parse.has_line_with(' log')
IP_ACL_ACE = parse.find_children_w_parents(IP_ACL_LIST, '')
#print(IP_ACL_ACE)
has_log_keyword = parse.has_line_with(r' log')
#print(has_log_keyword)
#
#has_log_keyword = has_log_keyword.split()
for log in IP_ACL_ACE:
#print (log)
#has_not_log_keyword = parse.has_line_with(r'. log')
#print(has_not_log_keyword)
keyword_log = 'log'
keyword_permit = 'permit'
keyword_deny = 'deny'
log = log.split()
print (log)
if (not keyword_log):
print('OPEN LINE VTY')
else:
print("Not a Finding: 'NET-VLAN-023'" )
# Main starting of script
def start():
script, input_file = argv
global parse
parse = CiscoConfParse (input_file)
print("Opening config file: %r\n" % input_file)
check_VTY_ACL_NET1637()
def main():
args = sys.argv[1:]
if len(args) == 1:
start()
#else:
#usage()
if __name__ == "__main__":
main()
here is the sample configuration file I am using with the ACL on the VTY
Current configuration : 25432 bytes
!
ip access-list extended SSH2-IN
remark ///\\\///\\\///\\\///\\\///\\\///\\\///
remark ///\\\***DEC 8 2015***///\\\
remark SomeSite //VoSIP //
remark ******************************************
permit ip 10.227.2.128 0.0.0.63 any
permit tcp 43.81.133.0 0.0.0.255 any eq 22 log
deny ip any any
!
line vty 0 4
access-class SSH2-IN in
line vty 5 15
access-class SSH2-IN in
!
end
from ciscoconfparse import CiscoConfParse
input_file = 'some_site.conf'
parse = CiscoConfParse(input_file)
## Build a list of vty ACLs here (and flag if a vty doesn't have one)
vty_acl_names = set([])
for vtyobj in parse.find_objects(r'^line\svty'):
vty_acl_name = vtyobj.re_match_iter_typed('access-class\s+(\S+)\s+in',
result_type=str, default="")
if not vty_acl_name:
print "FAIL: '{0}' doesn't have an ACL".format(vtyobj.text)
else:
vty_acl_names.add(vty_acl_name)
## Check ACL log compliance here (and ensure the ACL is even in the config)
for vty_acl_name in vty_acl_names:
try:
aclobj = parse.find_objects(r'ip\s+access-list\s+extended\s+{0}'.format(vty_acl_name))[0]
except IndexError:
print "FAIL: ACL {0} is applied to a vty, but it's missing from the config!".format(vty_acl_name)
## NOTE: this only works if you are using extended ACLs on the VTY
for ace in aclobj.children:
if 'remark' in ace.text:
continue
if 'log' in ace.text:
print "NOT A FINDING - ACL {0}, ACE: {1}".format(vty_acl_name, ace.text)
else:
print "OPEN (no log) - ACL {0}, ACE: {1}".format(vty_acl_name, ace.text)
When I run it on your config I get this output:
(py27_default) mpenning@MPENNING-BRIX C:\Users\mpenning
> python garrybaker.py
FAIL: 'line vty 5 15' doesn't have an ACL
OPEN (no log) - ACL SSH2-IN, ACE: permit ip 10.227.2.128 0.0.0.63 any
NOT A FINDING - ACL SSH2-IN, ACE: permit tcp 43.81.133.0 0.0.0.255 any eq 22 log
OPEN (no log) - ACL SSH2-IN, ACE: deny ip any any
(py27_default) mpenning@MPENNING-BRIX C:\Users\mpenning
>
I took the liberty of adding to your requirements... I flag vty lines that don't have an ACL.
Now, you might ask "Why did it say that 'line vty 5 15' doesn't have an ACL, because I put it in the config? It's because I used re_match_iter_typed(), which only searches children of the parent line... when you input a config like this, CiscoConfParse will not associate the access-class with the parent vty line on 5 15, because the access-class line is not indented more than line vty 5 15:
line vty 0 4
access-class SSH2-IN in
line vty 5 15
access-class SSH2-IN in
!
Indentation matters (a lot) to CiscoConfParse... you have to know your inputs... if you can't depend on people to indent their configs, then use the method in Kirk's answer :-)