From 3d1b34bf715e594aa4a013d409bfcc5a4c4ad99c Mon Sep 17 00:00:00 2001 From: Andrew Gunnerson Date: Wed, 16 Feb 2022 17:46:06 -0500 Subject: pki: eapol: T4245: Add full CA and client cert chains to wpa_supplicant PEM files This commit updates the eapol code so that it writes the full certificate chains for both the specified CA and the client certificate to `_ca.pem` and `_cert.pem`, respectively. The full CA chain is necessary for validating the incoming server certificate when it is signed by an intermediate CA and the intermediate CA cert is not included in the EAP-TLS ServerHello. In this scenario, wpa_supplicant needs to have both the intermediate CA and the root CA in its `ca_file`. Similarly, the full client certificate chain is needed when the ISP expects/requires that the client (wpa_supplicant) sends the client cert + the intermediate CA (or even + the root CA) as part of the EAP-TLS ClientHello. Signed-off-by: Andrew Gunnerson --- python/vyos/pki.py | 26 ++++++ smoketest/scripts/cli/test_interfaces_ethernet.py | 108 +++++++++++++++++----- src/conf_mode/interfaces-ethernet.py | 18 +++- 3 files changed, 125 insertions(+), 27 deletions(-) diff --git a/python/vyos/pki.py b/python/vyos/pki.py index 68ad73bf2..0b916eaae 100644 --- a/python/vyos/pki.py +++ b/python/vyos/pki.py @@ -331,3 +331,29 @@ def verify_certificate(cert, ca_cert): return True except InvalidSignature: return False + +# Certificate chain + +def find_parent(cert, ca_certs): + for ca_cert in ca_certs: + if verify_certificate(cert, ca_cert): + return ca_cert + return None + +def find_chain(cert, ca_certs): + remaining = ca_certs.copy() + chain = [cert] + + while remaining: + parent = find_parent(chain[-1], remaining) + if parent is None: + # No parent in the list of remaining certificates or there's a circular dependency + break + elif parent == chain[-1]: + # Self-signed: must be root CA (end of chain) + break + else: + remaining.remove(parent) + chain.append(parent) + + return chain diff --git a/smoketest/scripts/cli/test_interfaces_ethernet.py b/smoketest/scripts/cli/test_interfaces_ethernet.py index 6d80e4c96..ae3d5ed96 100755 --- a/smoketest/scripts/cli/test_interfaces_ethernet.py +++ b/smoketest/scripts/cli/test_interfaces_ethernet.py @@ -21,29 +21,73 @@ import unittest from base_interfaces_test import BasicInterfaceTest from vyos.configsession import ConfigSessionError from vyos.ifconfig import Section +from vyos.pki import CERT_BEGIN from vyos.util import cmd from vyos.util import process_named_running from vyos.util import read_file -cert_data = """ -MIICFDCCAbugAwIBAgIUfMbIsB/ozMXijYgUYG80T1ry+mcwCgYIKoZIzj0EAwIw -WTELMAkGA1UEBhMCR0IxEzARBgNVBAgMClNvbWUtU3RhdGUxEjAQBgNVBAcMCVNv -bWUtQ2l0eTENMAsGA1UECgwEVnlPUzESMBAGA1UEAwwJVnlPUyBUZXN0MB4XDTIx -MDcyMDEyNDUxMloXDTI2MDcxOTEyNDUxMlowWTELMAkGA1UEBhMCR0IxEzARBgNV -BAgMClNvbWUtU3RhdGUxEjAQBgNVBAcMCVNvbWUtQ2l0eTENMAsGA1UECgwEVnlP -UzESMBAGA1UEAwwJVnlPUyBUZXN0MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE -01HrLcNttqq4/PtoMua8rMWEkOdBu7vP94xzDO7A8C92ls1v86eePy4QllKCzIw3 -QxBIoCuH2peGRfWgPRdFsKNhMF8wDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8E -BAMCAYYwHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMBMB0GA1UdDgQWBBSu -+JnU5ZC4mkuEpqg2+Mk4K79oeDAKBggqhkjOPQQDAgNHADBEAiBEFdzQ/Bc3Lftz -ngrY605UhA6UprHhAogKgROv7iR4QgIgEFUxTtW3xXJcnUPWhhUFhyZoqfn8dE93 -+dm/LDnp7C0= +server_ca_root_cert_data = """ +MIIBcTCCARagAwIBAgIUDcAf1oIQV+6WRaW7NPcSnECQ/lUwCgYIKoZIzj0EAwIw +HjEcMBoGA1UEAwwTVnlPUyBzZXJ2ZXIgcm9vdCBDQTAeFw0yMjAyMTcxOTQxMjBa +Fw0zMjAyMTUxOTQxMjBaMB4xHDAaBgNVBAMME1Z5T1Mgc2VydmVyIHJvb3QgQ0Ew +WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAQ0y24GzKQf4aM2Ir12tI9yITOIzAUj +ZXyJeCmYI6uAnyAMqc4Q4NKyfq3nBi4XP87cs1jlC1P2BZ8MsjL5MdGWozIwMDAP +BgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBRwC/YaieMEnjhYa7K3Flw/o0SFuzAK +BggqhkjOPQQDAgNJADBGAiEAh3qEj8vScsjAdBy5shXzXDVVOKWCPTdGrPKnu8UW +a2cCIQDlDgkzWmn5ujc5ATKz1fj+Se/aeqwh4QyoWCVTFLIxhQ== """ -key_data = """ -MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgPLpD0Ohhoq0g4nhx -2KMIuze7ucKUt/lBEB2wc03IxXyhRANCAATTUestw222qrj8+2gy5rysxYSQ50G7 -u8/3jHMM7sDwL3aWzW/zp54/LhCWUoLMjDdDEEigK4fal4ZF9aA9F0Ww +server_ca_intermediate_cert_data = """ +MIIBmTCCAT+gAwIBAgIUNzrtHzLmi3QpPK57tUgCnJZhXXQwCgYIKoZIzj0EAwIw +HjEcMBoGA1UEAwwTVnlPUyBzZXJ2ZXIgcm9vdCBDQTAeFw0yMjAyMTcxOTQxMjFa +Fw0zMjAyMTUxOTQxMjFaMCYxJDAiBgNVBAMMG1Z5T1Mgc2VydmVyIGludGVybWVk +aWF0ZSBDQTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABEl2nJ1CzoqPV6hWII2m +eGN/uieU6wDMECTk/LgG8CCCSYb488dibUiFN/1UFsmoLIdIhkx/6MUCYh62m8U2 +WNujUzBRMA8GA1UdEwEB/wQFMAMBAf8wHQYDVR0OBBYEFMV3YwH88I5gFsFUibbQ +kMR0ECPsMB8GA1UdIwQYMBaAFHAL9hqJ4wSeOFhrsrcWXD+jRIW7MAoGCCqGSM49 +BAMCA0gAMEUCIQC/ahujD9dp5pMMCd3SZddqGC9cXtOwMN0JR3e5CxP13AIgIMQm +jMYrinFoInxmX64HfshYqnUY8608nK9D2BNPOHo= +""" + +client_ca_root_cert_data = """ +MIIBcDCCARagAwIBAgIUZmoW2xVdwkZSvglnkCq0AHKa6zIwCgYIKoZIzj0EAwIw +HjEcMBoGA1UEAwwTVnlPUyBjbGllbnQgcm9vdCBDQTAeFw0yMjAyMTcxOTQxMjFa +Fw0zMjAyMTUxOTQxMjFaMB4xHDAaBgNVBAMME1Z5T1MgY2xpZW50IHJvb3QgQ0Ew +WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAATUpKXzQk2NOVKDN4VULk2yw4mOKPvn +mg947+VY7lbpfOfAUD0QRg95qZWCw899eKnXp/U4TkAVrmEKhUb6OJTFozIwMDAP +BgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBTXu6xGWUl25X3sBtrhm3BJSICIATAK +BggqhkjOPQQDAgNIADBFAiEAnTzEwuTI9bz2Oae3LZbjP6f/f50KFJtjLZFDbQz7 +DpYCIDNRHV8zBUibC+zg5PqMpQBKd/oPfNU76nEv6xkp/ijO +""" + +client_ca_intermediate_cert_data = """ +MIIBmDCCAT+gAwIBAgIUJEMdotgqA7wU4XXJvEzDulUAGqgwCgYIKoZIzj0EAwIw +HjEcMBoGA1UEAwwTVnlPUyBjbGllbnQgcm9vdCBDQTAeFw0yMjAyMTcxOTQxMjJa +Fw0zMjAyMTUxOTQxMjJaMCYxJDAiBgNVBAMMG1Z5T1MgY2xpZW50IGludGVybWVk +aWF0ZSBDQTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABGyIVIi217s9j3O+WQ2b +6R65/Z0ZjQpELxPjBRc0CA0GFCo+pI5EvwI+jNFArvTAJ5+ZdEWUJ1DQhBKDDQdI +avCjUzBRMA8GA1UdEwEB/wQFMAMBAf8wHQYDVR0OBBYEFOUS8oNJjChB1Rb9Blcl +ETvziHJ9MB8GA1UdIwQYMBaAFNe7rEZZSXblfewG2uGbcElIgIgBMAoGCCqGSM49 +BAMCA0cAMEQCIArhaxWgRsAUbEeNHD/ULtstLHxw/P97qPUSROLQld53AiBjgiiz +9pDfISmpekZYz6bIDWRIR0cXUToZEMFNzNMrQg== +""" + +client_cert_data = """ +MIIBmTCCAUCgAwIBAgIUV5T77XdE/tV82Tk4Vzhp5BIFFm0wCgYIKoZIzj0EAwIw +JjEkMCIGA1UEAwwbVnlPUyBjbGllbnQgaW50ZXJtZWRpYXRlIENBMB4XDTIyMDIx +NzE5NDEyMloXDTMyMDIxNTE5NDEyMlowIjEgMB4GA1UEAwwXVnlPUyBjbGllbnQg +Y2VydGlmaWNhdGUwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARuyynqfc/qJj5e +KJ03oOH8X4Z8spDeAPO9WYckMM0ldPj+9kU607szFzPwjaPWzPdgyIWz3hcN8yAh +CIhytmJao1AwTjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBTIFKrxZ+PqOhYSUqnl +TGCUmM7wTjAfBgNVHSMEGDAWgBTlEvKDSYwoQdUW/QZXJRE784hyfTAKBggqhkjO +PQQDAgNHADBEAiAvO8/jvz05xqmP3OXD53XhfxDLMIxzN4KPoCkFqvjlhQIgIHq2 +/geVx3rAOtSps56q/jiDouN/aw01TdpmGKVAa9U= +""" + +client_key_data = """ +MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgxaxAQsJwjoOCByQE ++qSYKtKtJzbdbOnTsKNSrfgkFH6hRANCAARuyynqfc/qJj5eKJ03oOH8X4Z8spDe +APO9WYckMM0ldPj+9kU607szFzPwjaPWzPdgyIWz3hcN8yAhCIhytmJa """ def get_wpa_supplicant_value(interface, key): @@ -51,6 +95,10 @@ def get_wpa_supplicant_value(interface, key): tmp = re.findall(r'\n?{}=(.*)'.format(key), tmp) return tmp[0] +def get_certificate_count(interface, cert_type): + tmp = read_file(f'/run/wpa_supplicant/{interface}_{cert_type}.pem') + return tmp.count(CERT_BEGIN) + class EthernetInterfaceTest(BasicInterfaceTest.TestCase): @classmethod def setUpClass(cls): @@ -165,16 +213,23 @@ class EthernetInterfaceTest(BasicInterfaceTest.TestCase): self.cli_commit() def test_eapol_support(self): - ca_name = 'eapol' - cert_name = 'eapol' + ca_certs = { + 'eapol-server-ca-root': server_ca_root_cert_data, + 'eapol-server-ca-intermediate': server_ca_intermediate_cert_data, + 'eapol-client-ca-root': client_ca_root_cert_data, + 'eapol-client-ca-intermediate': client_ca_intermediate_cert_data, + } + cert_name = 'eapol-client' - self.cli_set(['pki', 'ca', ca_name, 'certificate', cert_data.replace('\n','')]) - self.cli_set(['pki', 'certificate', cert_name, 'certificate', cert_data.replace('\n','')]) - self.cli_set(['pki', 'certificate', cert_name, 'private', 'key', key_data.replace('\n','')]) + for name, data in ca_certs.items(): + self.cli_set(['pki', 'ca', name, 'certificate', data.replace('\n','')]) + + self.cli_set(['pki', 'certificate', cert_name, 'certificate', client_cert_data.replace('\n','')]) + self.cli_set(['pki', 'certificate', cert_name, 'private', 'key', client_key_data.replace('\n','')]) for interface in self._interfaces: # Enable EAPoL - self.cli_set(self._base_path + [interface, 'eapol', 'ca-certificate', ca_name]) + self.cli_set(self._base_path + [interface, 'eapol', 'ca-certificate', 'eapol-server-ca-intermediate']) self.cli_set(self._base_path + [interface, 'eapol', 'certificate', cert_name]) self.cli_commit() @@ -206,7 +261,12 @@ class EthernetInterfaceTest(BasicInterfaceTest.TestCase): tmp = get_wpa_supplicant_value(interface, 'identity') self.assertEqual(f'"{mac}"', tmp) - self.cli_delete(['pki', 'ca', ca_name]) + # Check certificate files have the full chain + self.assertEqual(get_certificate_count(interface, 'ca'), 2) + self.assertEqual(get_certificate_count(interface, 'cert'), 3) + + for name in ca_certs: + self.cli_delete(['pki', 'ca', name]) self.cli_delete(['pki', 'certificate', cert_name]) if __name__ == '__main__': diff --git a/src/conf_mode/interfaces-ethernet.py b/src/conf_mode/interfaces-ethernet.py index ab8d58f81..2a8a126f2 100755 --- a/src/conf_mode/interfaces-ethernet.py +++ b/src/conf_mode/interfaces-ethernet.py @@ -32,7 +32,9 @@ from vyos.configverify import verify_vlan_config from vyos.configverify import verify_vrf from vyos.ethtool import Ethtool from vyos.ifconfig import EthernetIf -from vyos.pki import wrap_certificate +from vyos.pki import find_chain +from vyos.pki import encode_certificate +from vyos.pki import load_certificate from vyos.pki import wrap_private_key from vyos.template import render from vyos.util import call @@ -159,7 +161,14 @@ def generate(ethernet): cert_name = ethernet['eapol']['certificate'] pki_cert = ethernet['pki']['certificate'][cert_name] - write_file(cert_file_path, wrap_certificate(pki_cert['certificate'])) + loaded_pki_cert = load_certificate(pki_cert['certificate']) + loaded_ca_certs = {load_certificate(c['certificate']) + for c in ethernet['pki']['ca'].values()} + + cert_full_chain = find_chain(loaded_pki_cert, loaded_ca_certs) + + write_file(cert_file_path, + '\n'.join(encode_certificate(c) for c in cert_full_chain)) write_file(cert_key_path, wrap_private_key(pki_cert['private']['key'])) if 'ca_certificate' in ethernet['eapol']: @@ -167,8 +176,11 @@ def generate(ethernet): ca_cert_name = ethernet['eapol']['ca_certificate'] pki_ca_cert = ethernet['pki']['ca'][ca_cert_name] + loaded_ca_cert = load_certificate(pki_ca_cert['certificate']) + ca_full_chain = find_chain(loaded_ca_cert, loaded_ca_certs) + write_file(ca_cert_file_path, - wrap_certificate(pki_ca_cert['certificate'])) + '\n'.join(encode_certificate(c) for c in ca_full_chain)) else: # delete configuration on interface removal if os.path.isfile(wpa_suppl_conf.format(**ethernet)): -- cgit v1.2.3