tuse x509 to check if server certificate has expired - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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DIR Files
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DIR Submodules
---
DIR commit f9985ae233d035d6b41aa18e882688af4b670ae0
DIR parent 8295ef8c7f1f34bb0cb489b19f4fa727070c8514
HTML Author: ThomasV <thomasv@gitorious>
Date: Fri, 27 Jun 2014 11:36:51 +0200
use x509 to check if server certificate has expired
Diffstat:
M lib/interface.py | 92 +++++++++++++++++--------------
M lib/paymentrequest.py | 7 +++++--
M lib/x509.py | 6 ++++--
3 files changed, 59 insertions(+), 46 deletions(-)
---
DIR diff --git a/lib/interface.py b/lib/interface.py
t@@ -27,48 +27,12 @@ from version import ELECTRUM_VERSION, PROTOCOL_VERSION
from util import print_error, print_msg
from simple_config import SimpleConfig
+import x509
DEFAULT_TIMEOUT = 5
proxy_modes = ['socks4', 'socks5', 'http']
-def check_cert(host, cert):
- from OpenSSL import crypto as c
- _cert = c.load_certificate(c.FILETYPE_PEM, cert)
-
- m = "host: %s\n"%host
- m += "has_expired: %s\n"% _cert.has_expired()
- m += "pubkey: %s bits\n" % _cert.get_pubkey().bits()
- m += "serial number: %s\n"% _cert.get_serial_number()
- #m += "issuer: %s\n"% _cert.get_issuer()
- #m += "algo: %s\n"% _cert.get_signature_algorithm()
- m += "version: %s\n"% _cert.get_version()
- print_msg(m)
-
-
-def cert_has_expired(cert_path):
- try:
- import OpenSSL
- except Exception:
- print_error("Warning: cannot import OpenSSL")
- return False
- from OpenSSL import crypto as c
- with open(cert_path) as f:
- cert = f.read()
- _cert = c.load_certificate(c.FILETYPE_PEM, cert)
- return _cert.has_expired()
-
-
-def check_certificates():
- config = SimpleConfig()
- mydir = os.path.join(config.path, "certs")
- certs = os.listdir(mydir)
- for c in certs:
- print c
- p = os.path.join(mydir,c)
- with open(p) as f:
- cert = f.read()
- check_cert(c, cert)
def cert_verify_hostname(s):
t@@ -392,11 +356,23 @@ class Interface(threading.Thread):
os.unlink(rej)
os.rename(temporary_path, rej)
else:
- if cert_has_expired(cert_path):
+ with open(cert_path) as f:
+ cert = f.read()
+ try:
+ x = x509.X509()
+ x.parse(cert)
+ x.slow_parse()
+ except:
+ traceback.print_exc(file=sys.stdout)
+ print_error("wrong certificate", self.host)
+ return
+ try:
+ x.check_date()
+ except:
print_error("certificate has expired:", cert_path)
os.unlink(cert_path)
- else:
- print_error("wrong certificate", self.host)
+ return
+ print_error("wrong certificate", self.host)
return
except Exception:
print_error("wrap_socket failed", self.host)
t@@ -614,6 +590,38 @@ class Interface(threading.Thread):
return out
-if __name__ == "__main__":
- check_certificates()
+
+def check_cert(host, cert):
+ try:
+ x = x509.X509()
+ x.parse(cert)
+ x.slow_parse()
+ except:
+ traceback.print_exc(file=sys.stdout)
+ return
+
+ try:
+ x.check_date()
+ expired = False
+ except:
+ expired = True
+
+ m = "host: %s\n"%host
+ m += "has_expired: %s\n"% expired
+ print_msg(m)
+
+
+def test_certificates():
+ config = SimpleConfig()
+ mydir = os.path.join(config.path, "certs")
+ certs = os.listdir(mydir)
+ for c in certs:
+ print c
+ p = os.path.join(mydir,c)
+ with open(p) as f:
+ cert = f.read()
+ check_cert(c, cert)
+
+if __name__ == "__main__":
+ test_certificates()
DIR diff --git a/lib/paymentrequest.py b/lib/paymentrequest.py
t@@ -169,8 +169,11 @@ class PaymentRequest:
x.slow_parse()
x509_chain.append(x)
if i == 0:
- if not x.check_name(self.domain):
- self.error = "Certificate Domain Mismatch"
+ try:
+ x.check_date()
+ x.check_name(self.domain)
+ except Exception as e:
+ self.error = str(e)
return
else:
if not x.check_ca():
DIR diff --git a/lib/x509.py b/lib/x509.py
t@@ -170,9 +170,8 @@ class X509(tlslite.X509):
return None
return not_after - datetime.utcnow()
- def check_name(self, expected):
+ def check_date(self):
not_before, not_after = self.extract_dates()
- cert_names = self.extract_names()
now = datetime.utcnow()
if not_before > now:
raise CertificateError(
t@@ -180,6 +179,9 @@ class X509(tlslite.X509):
if not_after <= now:
raise CertificateError(
'Certificate has expired.')
+
+ def check_name(self, expected):
+ cert_names = self.extract_names()
if '.' in expected:
expected_wild = expected[expected.index('.'):]
else: