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#!/usr/bin/env python
#
# Copyright 2017 David Carlos <ddavidcarlos1392@gmail.com>
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
# USA
import sys
import re
from subprocess import check_output
from firehose.model import Message, Point, \
File, Location, Generator, Metadata, Analysis, Issue
def main():
""" Main entry to flawfinder parser """
try:
arg_file = sys.argv[1]
report = open(arg_file, 'r')
except IOError as e:
raise e
except IndexError:
print("Missing input file")
analysis = parse_file(report)
sys.stdout.write(str(analysis.to_xml()))
sys.stdout.write('\n')
def parse_file(infile):
""" Parser flawfinder output
:infile: file-like object
:returns: Firehose Analysis object, representing the final XML.
Flawfinder can generate multiple cwes for a single issue.
Firehose's models does not supports multiple CWEs.
For now, when multiple CWEs ocurrs, we get only the first one.
A issue was created to track this bug:
https://github.com/fedora-static-analysis/firehose/issues/35
"""
line = infile.readline()
generator = Generator(name='flawfinder',
version=get_flawfinder_version(line))
metadata = Metadata(generator, None, None, None)
analysis = Analysis(metadata, [])
# A regex for "filename:linenum:"
ISSUE_LINE_PATTERN = r"(\S.*)\:([0-9]+)\:"
# A regex for the reported severity, e.g. "[2]"
ISSUE_SEVERITY_PATTERN = r"\[([0-9]+)\]"
# A regex for the reported testid, e.g. "(buffer)"
ISSUE_TESTID_PATTERN = r"\(([a-z]+)\)"
WHITESPACE = "\s+"
FIRST_LINE_PATTERN = (ISSUE_LINE_PATTERN + WHITESPACE +
ISSUE_SEVERITY_PATTERN + WHITESPACE +
ISSUE_TESTID_PATTERN)
prog = re.compile(FIRST_LINE_PATTERN)
while line:
m = prog.match(line)
if m:
issue_path = m.group(1)
issue_line = m.group(2)
issue_severity = m.group(3)
testid = m.group(4)
location = Location(file=File(issue_path, None),
function=None,
point=Point(int(issue_line), 0))
message_line = infile.readline()
issue_message = ""
while not prog.search(message_line) and message_line != "\n":
# Build up issue_message as one line, stripping out
# extraneous whitespace.
if issue_message:
issue_message += " " + message_line.strip()
else:
issue_message = message_line.strip()
message_line = infile.readline()
line = message_line
cwes = [int(cwe) for cwe in re.findall("CWE-([0-9]+)",
issue_message)]
if cwes:
first_cwe = int(cwes[0])
else:
first_cwe = None
issue = Issue(first_cwe, testid, location,
Message(text=issue_message), notes=None,
trace=None, severity=issue_severity, customfields=None)
analysis.results.append(issue)
else:
line = infile.readline()
return analysis
def get_flawfinder_version(first_line):
"""Retrieve flawfinder version from report.
:first_line: first line of the flawfinder report.
:returns: flawfinder version.
"""
pattern = "version\s([0-9]?.[0-9]*)"
prog = re.compile(pattern)
try:
return prog.search(first_line).groups()[0]
except IndexError:
return None
if __name__ == '__main__':
main()
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