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Copy pathsecurityheaders.py
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241 lines (198 loc) · 8.38 KB
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import httplib
import argparse
import socket
import ssl
import sys
from urlparse import urlparse
class SecurityHeaders():
def __init__(self):
pass
def evaluate_warn(self, header, contents):
""" Risk evaluation function.
Set header warning flag (1/0) according to its contents.
Args:
header (str): HTTP header name in lower-case
contents (str): Header contents (value)
"""
warn = 1
if header == 'x-frame-options':
if contents.lower() in ['deny', 'sameorigin']:
warn = 0
else:
warn = 1
if header == 'strict-transport-security':
warn = 0
""" Evaluating the warn of CSP contents may be a bit more tricky.
For now, just disable the warn if the header is defined
"""
if header == 'content-security-policy':
warn = 0
""" Raise the warn flag, if cross domain requests are allowed from any
origin """
if header == 'access-control-allow-origin':
if contents == '*':
warn = 1
else:
warn = 0
if header == 'x-xss-protection':
if contents.lower() in ['1', '1; mode=block']:
warn = 0
else:
warn = 1
if header == 'x-content-type-options':
if contents.lower() == 'nosniff':
warn = 0
else:
warn =1
""" Enable warning if backend version information is disclosed """
if header == 'x-powered-by' or header == 'server':
if len(contents) > 1:
warn = 1
else:
warn = 0
return {'defined': True, 'warn': warn, 'contents': contents}
def test_https(self, url):
parsed = urlparse(url)
protocol = parsed[0]
hostname = parsed[1]
path = parsed[2]
sslerror = False
conn = httplib.HTTPSConnection(hostname)
try:
conn.request('GET', '/')
res = conn.getresponse()
except socket.gaierror:
return {'supported': False, 'certvalid': False}
except ssl.CertificateError:
return {'supported': True, 'certvalid': False}
except:
sslerror = True
# if tls connection fails for unexcepted error, retry without verifying cert
if sslerror:
conn = httplib.HTTPSConnection(hostname, timeout=5, context = ssl._create_unverified_context() )
try:
conn.request('GET', '/')
res = conn.getresponse()
return {'supported': True, 'certvalid': False}
except:
return {'supported': False, 'certvalid': False}
return {'supported': True, 'certvalid': True}
def test_http_to_https(self, url, follow_redirects = 5):
parsed = urlparse(url)
protocol = parsed[0]
hostname = parsed[1]
path = parsed[2]
if not protocol:
protocol = 'http' # default to http if protocl scheme not specified
if protocol == 'https' and follow_redirects != 5:
return True
elif protocol == 'https' and follow_redirects == 5:
protocol = 'http'
if (protocol == 'http'):
conn = httplib.HTTPConnection(hostname)
try:
conn.request('HEAD', path)
res = conn.getresponse()
headers = res.getheaders()
except socket.gaierror:
print 'HTTP request failed'
return False
""" Follow redirect """
if (res.status >= 300 and res.status < 400 and follow_redirects > 0):
for header in headers:
if (header[0] == 'location'):
return self.test_http_to_https(header[1], follow_redirects - 1)
return False
def check_headers(self, url, follow_redirects = 0):
""" Make the HTTP request and check if any of the pre-defined
headers exists.
Args:
url (str): Target URL in format: scheme://hostname/path/to/file
follow_redirects (Optional[str]): How deep we follow the redirects,
value 0 disables redirects.
"""
""" Default return array """
retval = {
'x-frame-options': {'defined': False, 'warn': 1, 'contents': '' },
'strict-transport-security': {'defined': False, 'warn': 1, 'contents': ''},
'access-control-allow-origin': {'defined': False, 'warn': 0, 'contents': ''},
'content-security-policy': {'defined': False, 'warn': 1, 'contents': ''},
'x-xss-protection': {'defined': False, 'warn': 1, 'contents': ''},
'x-content-type-options': {'defined': False, 'warn': 1, 'contents': ''},
'x-powered-by': {'defined': False, 'warn': 0, 'contents': ''},
'server': {'defined': False, 'warn': 0, 'contents': ''}
}
parsed = urlparse(url)
protocol = parsed[0]
hostname = parsed[1]
path = parsed[2]
if (protocol == 'http'):
conn = httplib.HTTPConnection(hostname)
elif (protocol == 'https'):
# on error, retry without verifying cert
# in this context, we're not really interested in cert validity
conn = httplib.HTTPSConnection(hostname, context = ssl._create_unverified_context() )
else:
""" Unknown protocol scheme """
return {}
try:
conn.request('HEAD', path)
res = conn.getresponse()
headers = res.getheaders()
except socket.gaierror:
print 'HTTP request failed'
return False
""" Follow redirect """
if (res.status >= 300 and res.status < 400 and follow_redirects > 0):
for header in headers:
if (header[0] == 'location'):
return self.check_headers(header[1], follow_redirects - 1)
""" Loop through headers and evaluate the risk """
for header in headers:
if (header[0] in retval):
retval[header[0]] = self.evaluate_warn(header[0], header[1])
return retval
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Check HTTP security headers', \
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('url', metavar='URL', type=str, help='Target URL')
parser.add_argument('--max-redirects', dest='max_redirects', metavar='N', default=2, type=int, help='Max redirects, set 0 to disable')
args = parser.parse_args()
url = args.url
redirects = args.max_redirects
foo = SecurityHeaders()
parsed = urlparse(url)
if not parsed.scheme:
url = 'http://' + url # default to http if scheme not provided
headers = foo.check_headers(url, redirects)
if not headers:
sys.exit(1)
okColor = '\033[92m'
warnColor = '\033[93m'
endColor = '\033[0m'
for header, value in headers.iteritems():
if value['warn'] == 1:
if value['defined'] == False:
print 'Header \'' + header + '\' is missing ... [ ' + warnColor + 'WARN' + endColor + ' ]'
else:
print 'Header \'' + header + '\' contains value \'' + value['contents'] + '\'' + \
' ... [ ' + warnColor + 'WARN' + endColor + ' ]'
elif value['warn'] == 0:
if value['defined'] == False:
print 'Header \'' + header + '\' is missing ... [ ' + okColor + 'OK' + endColor +' ]'
else:
print 'Header \'' + header + '\' contains value \'' + value['contents'] + '\'' + \
' ... [ ' + okColor + 'OK' + endColor + ' ]'
https = foo.test_https(url)
if https['supported']:
print 'HTTPS supported ... [ ' + okColor + 'OK' + endColor + ' ]'
else:
print 'HTTPS supported ... [ ' + warnColor + 'FAIL' + endColor + ' ]'
if https['certvalid']:
print 'HTTPS valid certificate ... [ ' + okColor + 'OK' + endColor + ' ]'
else:
print 'HTTPS valid certificate ... [ ' + warnColor + 'FAIL' + endColor + ' ]'
if foo.test_http_to_https(url, 5):
print 'HTTP -> HTTPS redirect ... [ ' + okColor + 'OK' + endColor + ' ]'
else:
print 'HTTP -> HTTPS redirect ... [ ' + warnColor + 'FAIL' + endColor + ' ]'
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