You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.5 KiB
80 lines
2.5 KiB
4 months ago
|
#!/usr/bin/env python
|
||
|
|
#
|
||
|
|
# fetch the certificate that the server(s) are providing in PEM form
|
||
|
|
#
|
||
|
|
# args are HOST:PORT [, HOST:PORT...]
|
||
|
|
#
|
||
|
|
# By Bill Janssen.
|
||
|
|
|
||
|
|
import sys
|
||
|
|
|
||
|
|
def fetch_server_certificate (host, port):
|
||
|
|
|
||
|
|
import re, tempfile, os, ssl
|
||
|
|
|
||
|
|
def subproc(cmd):
|
||
|
|
from subprocess import Popen, PIPE, STDOUT
|
||
|
|
proc = Popen(cmd, stdout=PIPE, stderr=STDOUT, shell=True)
|
||
|
|
status = proc.wait()
|
||
|
|
output = proc.stdout.read()
|
||
|
|
return status, output
|
||
|
|
|
||
|
|
def strip_to_x509_cert(certfile_contents, outfile=None):
|
||
|
|
m = re.search(r"^([-]+BEGIN CERTIFICATE[-]+[\r]*\n"
|
||
|
|
r".*[\r]*^[-]+END CERTIFICATE[-]+)$",
|
||
|
|
certfile_contents, re.MULTILINE | re.DOTALL)
|
||
|
|
if not m:
|
||
|
|
return None
|
||
|
|
else:
|
||
|
|
tn = tempfile.mktemp()
|
||
|
|
fp = open(tn, "w")
|
||
|
|
fp.write(m.group(1) + "\n")
|
||
|
|
fp.close()
|
||
|
|
try:
|
||
|
|
tn2 = (outfile or tempfile.mktemp())
|
||
|
|
status, output = subproc(r'openssl x509 -in "%s" -out "%s"' %
|
||
|
|
(tn, tn2))
|
||
|
|
if status != 0:
|
||
|
|
raise OperationError(status, tsig, output)
|
||
|
|
fp = open(tn2, 'rb')
|
||
|
|
data = fp.read()
|
||
|
|
fp.close()
|
||
|
|
os.unlink(tn2)
|
||
|
|
return data
|
||
|
|
finally:
|
||
|
|
os.unlink(tn)
|
||
|
|
|
||
|
|
if sys.platform.startswith("win"):
|
||
|
|
tfile = tempfile.mktemp()
|
||
|
|
fp = open(tfile, "w")
|
||
|
|
fp.write("quit\n")
|
||
|
|
fp.close()
|
||
|
|
try:
|
||
|
|
status, output = subproc(
|
||
|
|
'openssl s_client -connect "%s:%s" -showcerts < "%s"' %
|
||
|
|
(host, port, tfile))
|
||
|
|
finally:
|
||
|
|
os.unlink(tfile)
|
||
|
|
else:
|
||
|
|
status, output = subproc(
|
||
|
|
'openssl s_client -connect "%s:%s" -showcerts < /dev/null' %
|
||
|
|
(host, port))
|
||
|
|
if status != 0:
|
||
|
|
raise OSError(status)
|
||
|
|
certtext = strip_to_x509_cert(output)
|
||
|
|
if not certtext:
|
||
|
|
raise ValueError("Invalid response received from server at %s:%s" %
|
||
|
|
(host, port))
|
||
|
|
return certtext
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
if len(sys.argv) < 2:
|
||
|
|
sys.stderr.write(
|
||
|
|
"Usage: %s HOSTNAME:PORTNUMBER [, HOSTNAME:PORTNUMBER...]\n" %
|
||
|
|
sys.argv[0])
|
||
|
|
sys.exit(1)
|
||
|
|
for arg in sys.argv[1:]:
|
||
|
|
host, port = arg.split(":")
|
||
|
|
sys.stdout.write(fetch_server_certificate(host, int(port)))
|
||
|
|
sys.exit(0)
|