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community.crypto/plugins/modules/openssl_csr_info.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2016-2017, Yanis Guenane <yanis+ansible@guenane.org>
# Copyright: (c) 2017, Markus Teufelberger <mteufelberger+ansible@mgit.at>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'}
DOCUMENTATION = r'''
---
module: openssl_csr_info
short_description: Provide information of OpenSSL Certificate Signing Requests (CSR)
description:
- This module allows one to query information on OpenSSL Certificate Signing Requests (CSR).
- In case the CSR signature cannot be validated, the module will fail. In this case, all return
variables are still returned.
- It uses the pyOpenSSL or cryptography python library to interact with OpenSSL. If both the
cryptography and PyOpenSSL libraries are available (and meet the minimum version requirements)
cryptography will be preferred as a backend over PyOpenSSL (unless the backend is forced with
C(select_crypto_backend)). Please note that the PyOpenSSL backend was deprecated in Ansible 2.9
and will be removed in Ansible 2.13.
requirements:
- PyOpenSSL >= 0.15 or cryptography >= 1.3
author:
- Felix Fontein (@felixfontein)
- Yanis Guenane (@Spredzy)
options:
path:
description:
- Remote absolute path where the CSR file is loaded from.
- Either I(path) or I(content) must be specified, but not both.
type: path
content:
description:
- Content of the CSR file.
- Either I(path) or I(content) must be specified, but not both.
type: str
select_crypto_backend:
description:
- Determines which crypto backend to use.
- The default choice is C(auto), which tries to use C(cryptography) if available, and falls back to C(pyopenssl).
- If set to C(pyopenssl), will try to use the L(pyOpenSSL,https://pypi.org/project/pyOpenSSL/) library.
- If set to C(cryptography), will try to use the L(cryptography,https://cryptography.io/) library.
- Please note that the C(pyopenssl) backend has been deprecated in Ansible 2.9, and will be removed in Ansible 2.13.
From that point on, only the C(cryptography) backend will be available.
type: str
default: auto
choices: [ auto, cryptography, pyopenssl ]
seealso:
- module: openssl_csr
'''
EXAMPLES = r'''
- name: Generate an OpenSSL Certificate Signing Request
community.crypto.openssl_csr:
path: /etc/ssl/csr/www.ansible.com.csr
privatekey_path: /etc/ssl/private/ansible.com.pem
common_name: www.ansible.com
- name: Get information on the CSR
community.crypto.openssl_csr_info:
path: /etc/ssl/csr/www.ansible.com.csr
register: result
- name: Dump information
debug:
var: result
'''
RETURN = r'''
signature_valid:
description:
- Whether the CSR's signature is valid.
- In case the check returns C(no), the module will fail.
returned: success
type: bool
basic_constraints:
description: Entries in the C(basic_constraints) extension, or C(none) if extension is not present.
returned: success
type: list
elements: str
sample: "[CA:TRUE, pathlen:1]"
basic_constraints_critical:
description: Whether the C(basic_constraints) extension is critical.
returned: success
type: bool
extended_key_usage:
description: Entries in the C(extended_key_usage) extension, or C(none) if extension is not present.
returned: success
type: list
elements: str
sample: "[Biometric Info, DVCS, Time Stamping]"
extended_key_usage_critical:
description: Whether the C(extended_key_usage) extension is critical.
returned: success
type: bool
extensions_by_oid:
description: Returns a dictionary for every extension OID
returned: success
type: dict
contains:
critical:
description: Whether the extension is critical.
returned: success
type: bool
value:
description: The Base64 encoded value (in DER format) of the extension
returned: success
type: str
sample: "MAMCAQU="
sample: '{"1.3.6.1.5.5.7.1.24": { "critical": false, "value": "MAMCAQU="}}'
key_usage:
description: Entries in the C(key_usage) extension, or C(none) if extension is not present.
returned: success
type: str
sample: "[Key Agreement, Data Encipherment]"
key_usage_critical:
description: Whether the C(key_usage) extension is critical.
returned: success
type: bool
subject_alt_name:
description: Entries in the C(subject_alt_name) extension, or C(none) if extension is not present.
returned: success
type: list
elements: str
sample: "[DNS:www.ansible.com, IP:1.2.3.4]"
subject_alt_name_critical:
description: Whether the C(subject_alt_name) extension is critical.
returned: success
type: bool
ocsp_must_staple:
description: C(yes) if the OCSP Must Staple extension is present, C(none) otherwise.
returned: success
type: bool
ocsp_must_staple_critical:
description: Whether the C(ocsp_must_staple) extension is critical.
returned: success
type: bool
subject:
description:
- The CSR's subject as a dictionary.
- Note that for repeated values, only the last one will be returned.
returned: success
type: dict
sample: '{"commonName": "www.example.com", "emailAddress": "test@example.com"}'
subject_ordered:
description: The CSR's subject as an ordered list of tuples.
returned: success
type: list
elements: list
sample: '[["commonName", "www.example.com"], ["emailAddress": "test@example.com"]]'
version_added: "2.9"
public_key:
description: CSR's public key in PEM format
returned: success
type: str
sample: "-----BEGIN PUBLIC KEY-----\nMIICIjANBgkqhkiG9w0BAQEFAAOCAg8A..."
public_key_fingerprints:
description:
- Fingerprints of CSR's public key.
- For every hash algorithm available, the fingerprint is computed.
returned: success
type: dict
sample: "{'sha256': 'd4:b3:aa:6d:c8:04:ce:4e:ba:f6:29:4d:92:a3:94:b0:c2:ff:bd:bf:33:63:11:43:34:0f:51:b0:95:09:2f:63',
'sha512': 'f7:07:4a:f0:b0:f0:e6:8b:95:5f:f9:e6:61:0a:32:68:f1..."
subject_key_identifier:
description:
- The CSR's subject key identifier.
- The identifier is returned in hexadecimal, with C(:) used to separate bytes.
- Is C(none) if the C(SubjectKeyIdentifier) extension is not present.
returned: success and if the pyOpenSSL backend is I(not) used
type: str
sample: '00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff:00:11:22:33'
version_added: "2.9"
authority_key_identifier:
description:
- The CSR's authority key identifier.
- The identifier is returned in hexadecimal, with C(:) used to separate bytes.
- Is C(none) if the C(AuthorityKeyIdentifier) extension is not present.
returned: success and if the pyOpenSSL backend is I(not) used
type: str
sample: '00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff:00:11:22:33'
version_added: "2.9"
authority_cert_issuer:
description:
- The CSR's authority cert issuer as a list of general names.
- Is C(none) if the C(AuthorityKeyIdentifier) extension is not present.
returned: success and if the pyOpenSSL backend is I(not) used
type: list
elements: str
sample: "[DNS:www.ansible.com, IP:1.2.3.4]"
version_added: "2.9"
authority_cert_serial_number:
description:
- The CSR's authority cert serial number.
- Is C(none) if the C(AuthorityKeyIdentifier) extension is not present.
returned: success and if the pyOpenSSL backend is I(not) used
type: int
sample: '12345'
version_added: "2.9"
'''
import abc
import binascii
import os
import traceback
from distutils.version import LooseVersion
from ansible.module_utils.basic import AnsibleModule, missing_required_lib
from ansible.module_utils._text import to_native, to_text, to_bytes
from ansible_collections.community.crypto.plugins.module_utils import crypto as crypto_utils
from ansible_collections.community.crypto.plugins.module_utils.compat import ipaddress as compat_ipaddress
MINIMAL_CRYPTOGRAPHY_VERSION = '1.3'
MINIMAL_PYOPENSSL_VERSION = '0.15'
PYOPENSSL_IMP_ERR = None
try:
import OpenSSL
from OpenSSL import crypto
PYOPENSSL_VERSION = LooseVersion(OpenSSL.__version__)
if OpenSSL.SSL.OPENSSL_VERSION_NUMBER >= 0x10100000:
# OpenSSL 1.1.0 or newer
OPENSSL_MUST_STAPLE_NAME = b"tlsfeature"
OPENSSL_MUST_STAPLE_VALUE = b"status_request"
else:
# OpenSSL 1.0.x or older
OPENSSL_MUST_STAPLE_NAME = b"1.3.6.1.5.5.7.1.24"
OPENSSL_MUST_STAPLE_VALUE = b"DER:30:03:02:01:05"
except ImportError:
PYOPENSSL_IMP_ERR = traceback.format_exc()
PYOPENSSL_FOUND = False
else:
PYOPENSSL_FOUND = True
CRYPTOGRAPHY_IMP_ERR = None
try:
import cryptography
from cryptography import x509
from cryptography.hazmat.primitives import serialization
CRYPTOGRAPHY_VERSION = LooseVersion(cryptography.__version__)
except ImportError:
CRYPTOGRAPHY_IMP_ERR = traceback.format_exc()
CRYPTOGRAPHY_FOUND = False
else:
CRYPTOGRAPHY_FOUND = True
TIMESTAMP_FORMAT = "%Y%m%d%H%M%SZ"
class CertificateSigningRequestInfo(crypto_utils.OpenSSLObject):
def __init__(self, module, backend):
super(CertificateSigningRequestInfo, self).__init__(
module.params['path'] or '',
'present',
False,
module.check_mode,
)
self.backend = backend
self.module = module
self.content = module.params['content']
if self.content is not None:
self.content = self.content.encode('utf-8')
def generate(self):
# Empty method because crypto_utils.OpenSSLObject wants this
pass
def dump(self):
# Empty method because crypto_utils.OpenSSLObject wants this
pass
@abc.abstractmethod
def _get_subject_ordered(self):
pass
@abc.abstractmethod
def _get_key_usage(self):
pass
@abc.abstractmethod
def _get_extended_key_usage(self):
pass
@abc.abstractmethod
def _get_basic_constraints(self):
pass
@abc.abstractmethod
def _get_ocsp_must_staple(self):
pass
@abc.abstractmethod
def _get_subject_alt_name(self):
pass
@abc.abstractmethod
def _get_public_key(self, binary):
pass
@abc.abstractmethod
def _get_subject_key_identifier(self):
pass
@abc.abstractmethod
def _get_authority_key_identifier(self):
pass
@abc.abstractmethod
def _get_all_extensions(self):
pass
@abc.abstractmethod
def _is_signature_valid(self):
pass
def get_info(self):
result = dict()
self.csr = crypto_utils.load_certificate_request(self.path, content=self.content, backend=self.backend)
subject = self._get_subject_ordered()
result['subject'] = dict()
for k, v in subject:
result['subject'][k] = v
result['subject_ordered'] = subject
result['key_usage'], result['key_usage_critical'] = self._get_key_usage()
result['extended_key_usage'], result['extended_key_usage_critical'] = self._get_extended_key_usage()
result['basic_constraints'], result['basic_constraints_critical'] = self._get_basic_constraints()
result['ocsp_must_staple'], result['ocsp_must_staple_critical'] = self._get_ocsp_must_staple()
result['subject_alt_name'], result['subject_alt_name_critical'] = self._get_subject_alt_name()
result['public_key'] = self._get_public_key(binary=False)
pk = self._get_public_key(binary=True)
result['public_key_fingerprints'] = crypto_utils.get_fingerprint_of_bytes(pk) if pk is not None else dict()
if self.backend != 'pyopenssl':
ski = self._get_subject_key_identifier()
if ski is not None:
ski = to_native(binascii.hexlify(ski))
ski = ':'.join([ski[i:i + 2] for i in range(0, len(ski), 2)])
result['subject_key_identifier'] = ski
aki, aci, acsn = self._get_authority_key_identifier()
if aki is not None:
aki = to_native(binascii.hexlify(aki))
aki = ':'.join([aki[i:i + 2] for i in range(0, len(aki), 2)])
result['authority_key_identifier'] = aki
result['authority_cert_issuer'] = aci
result['authority_cert_serial_number'] = acsn
result['extensions_by_oid'] = self._get_all_extensions()
result['signature_valid'] = self._is_signature_valid()
if not result['signature_valid']:
self.module.fail_json(
msg='CSR signature is invalid!',
**result
)
return result
class CertificateSigningRequestInfoCryptography(CertificateSigningRequestInfo):
"""Validate the supplied CSR, using the cryptography backend"""
def __init__(self, module):
super(CertificateSigningRequestInfoCryptography, self).__init__(module, 'cryptography')
def _get_subject_ordered(self):
result = []
for attribute in self.csr.subject:
result.append([crypto_utils.cryptography_oid_to_name(attribute.oid), attribute.value])
return result
def _get_key_usage(self):
try:
current_key_ext = self.csr.extensions.get_extension_for_class(x509.KeyUsage)
current_key_usage = current_key_ext.value
key_usage = dict(
digital_signature=current_key_usage.digital_signature,
content_commitment=current_key_usage.content_commitment,
key_encipherment=current_key_usage.key_encipherment,
data_encipherment=current_key_usage.data_encipherment,
key_agreement=current_key_usage.key_agreement,
key_cert_sign=current_key_usage.key_cert_sign,
crl_sign=current_key_usage.crl_sign,
encipher_only=False,
decipher_only=False,
)
if key_usage['key_agreement']:
key_usage.update(dict(
encipher_only=current_key_usage.encipher_only,
decipher_only=current_key_usage.decipher_only
))
key_usage_names = dict(
digital_signature='Digital Signature',
content_commitment='Non Repudiation',
key_encipherment='Key Encipherment',
data_encipherment='Data Encipherment',
key_agreement='Key Agreement',
key_cert_sign='Certificate Sign',
crl_sign='CRL Sign',
encipher_only='Encipher Only',
decipher_only='Decipher Only',
)
return sorted([
key_usage_names[name] for name, value in key_usage.items() if value
]), current_key_ext.critical
except cryptography.x509.ExtensionNotFound:
return None, False
def _get_extended_key_usage(self):
try:
ext_keyusage_ext = self.csr.extensions.get_extension_for_class(x509.ExtendedKeyUsage)
return sorted([
crypto_utils.cryptography_oid_to_name(eku) for eku in ext_keyusage_ext.value
]), ext_keyusage_ext.critical
except cryptography.x509.ExtensionNotFound:
return None, False
def _get_basic_constraints(self):
try:
ext_keyusage_ext = self.csr.extensions.get_extension_for_class(x509.BasicConstraints)
result = []
result.append('CA:{0}'.format('TRUE' if ext_keyusage_ext.value.ca else 'FALSE'))
if ext_keyusage_ext.value.path_length is not None:
result.append('pathlen:{0}'.format(ext_keyusage_ext.value.path_length))
return sorted(result), ext_keyusage_ext.critical
except cryptography.x509.ExtensionNotFound:
return None, False
def _get_ocsp_must_staple(self):
try:
try:
# This only works with cryptography >= 2.1
tlsfeature_ext = self.csr.extensions.get_extension_for_class(x509.TLSFeature)
value = cryptography.x509.TLSFeatureType.status_request in tlsfeature_ext.value
except AttributeError as dummy:
# Fallback for cryptography < 2.1
oid = x509.oid.ObjectIdentifier("1.3.6.1.5.5.7.1.24")
tlsfeature_ext = self.csr.extensions.get_extension_for_oid(oid)
value = tlsfeature_ext.value.value == b"\x30\x03\x02\x01\x05"
return value, tlsfeature_ext.critical
except cryptography.x509.ExtensionNotFound:
return None, False
def _get_subject_alt_name(self):
try:
san_ext = self.csr.extensions.get_extension_for_class(x509.SubjectAlternativeName)
result = [crypto_utils.cryptography_decode_name(san) for san in san_ext.value]
return result, san_ext.critical
except cryptography.x509.ExtensionNotFound:
return None, False
def _get_public_key(self, binary):
return self.csr.public_key().public_bytes(
serialization.Encoding.DER if binary else serialization.Encoding.PEM,
serialization.PublicFormat.SubjectPublicKeyInfo
)
def _get_subject_key_identifier(self):
try:
ext = self.csr.extensions.get_extension_for_class(x509.SubjectKeyIdentifier)
return ext.value.digest
except cryptography.x509.ExtensionNotFound:
return None
def _get_authority_key_identifier(self):
try:
ext = self.csr.extensions.get_extension_for_class(x509.AuthorityKeyIdentifier)
issuer = None
if ext.value.authority_cert_issuer is not None:
issuer = [crypto_utils.cryptography_decode_name(san) for san in ext.value.authority_cert_issuer]
return ext.value.key_identifier, issuer, ext.value.authority_cert_serial_number
except cryptography.x509.ExtensionNotFound:
return None, None, None
def _get_all_extensions(self):
return crypto_utils.cryptography_get_extensions_from_csr(self.csr)
def _is_signature_valid(self):
return self.csr.is_signature_valid
class CertificateSigningRequestInfoPyOpenSSL(CertificateSigningRequestInfo):
"""validate the supplied CSR."""
def __init__(self, module):
super(CertificateSigningRequestInfoPyOpenSSL, self).__init__(module, 'pyopenssl')
def __get_name(self, name):
result = []
for sub in name.get_components():
result.append([crypto_utils.pyopenssl_normalize_name(sub[0]), to_text(sub[1])])
return result
def _get_subject_ordered(self):
return self.__get_name(self.csr.get_subject())
def _get_extension(self, short_name):
for extension in self.csr.get_extensions():
if extension.get_short_name() == short_name:
result = [
crypto_utils.pyopenssl_normalize_name(usage.strip()) for usage in to_text(extension, errors='surrogate_or_strict').split(',')
]
return sorted(result), bool(extension.get_critical())
return None, False
def _get_key_usage(self):
return self._get_extension(b'keyUsage')
def _get_extended_key_usage(self):
return self._get_extension(b'extendedKeyUsage')
def _get_basic_constraints(self):
return self._get_extension(b'basicConstraints')
def _get_ocsp_must_staple(self):
extensions = self.csr.get_extensions()
oms_ext = [
ext for ext in extensions
if to_bytes(ext.get_short_name()) == OPENSSL_MUST_STAPLE_NAME and to_bytes(ext) == OPENSSL_MUST_STAPLE_VALUE
]
if OpenSSL.SSL.OPENSSL_VERSION_NUMBER < 0x10100000:
# Older versions of libssl don't know about OCSP Must Staple
oms_ext.extend([ext for ext in extensions if ext.get_short_name() == b'UNDEF' and ext.get_data() == b'\x30\x03\x02\x01\x05'])
if oms_ext:
return True, bool(oms_ext[0].get_critical())
else:
return None, False
def _normalize_san(self, san):
# apparently openssl returns 'IP address' not 'IP' as specifier when converting the subjectAltName to string
# although it won't accept this specifier when generating the CSR. (https://github.com/openssl/openssl/issues/4004)
if san.startswith('IP Address:'):
san = 'IP:' + san[len('IP Address:'):]
if san.startswith('IP:'):
ip = compat_ipaddress.ip_address(san[3:])
san = 'IP:{0}'.format(ip.compressed)
return san
def _get_subject_alt_name(self):
for extension in self.csr.get_extensions():
if extension.get_short_name() == b'subjectAltName':
result = [self._normalize_san(altname.strip()) for altname in
to_text(extension, errors='surrogate_or_strict').split(', ')]
return result, bool(extension.get_critical())
return None, False
def _get_public_key(self, binary):
try:
return crypto.dump_publickey(
crypto.FILETYPE_ASN1 if binary else crypto.FILETYPE_PEM,
self.csr.get_pubkey()
)
except AttributeError:
try:
bio = crypto._new_mem_buf()
if binary:
rc = crypto._lib.i2d_PUBKEY_bio(bio, self.csr.get_pubkey()._pkey)
else:
rc = crypto._lib.PEM_write_bio_PUBKEY(bio, self.csr.get_pubkey()._pkey)
if rc != 1:
crypto._raise_current_error()
return crypto._bio_to_string(bio)
except AttributeError:
self.module.warn('Your pyOpenSSL version does not support dumping public keys. '
'Please upgrade to version 16.0 or newer, or use the cryptography backend.')
def _get_subject_key_identifier(self):
# Won't be implemented
return None
def _get_authority_key_identifier(self):
# Won't be implemented
return None, None, None
def _get_all_extensions(self):
return crypto_utils.pyopenssl_get_extensions_from_csr(self.csr)
def _is_signature_valid(self):
try:
return bool(self.csr.verify(self.csr.get_pubkey()))
except crypto.Error:
# OpenSSL error means that key is not consistent
return False
def main():
module = AnsibleModule(
argument_spec=dict(
path=dict(type='path'),
content=dict(type='str'),
select_crypto_backend=dict(type='str', default='auto', choices=['auto', 'cryptography', 'pyopenssl']),
),
required_one_of=(
['path', 'content'],
),
mutually_exclusive=(
['path', 'content'],
),
supports_check_mode=True,
)
try:
if module.params['path'] is not None:
base_dir = os.path.dirname(module.params['path']) or '.'
if not os.path.isdir(base_dir):
module.fail_json(
name=base_dir,
msg='The directory %s does not exist or the file is not a directory' % base_dir
)
backend = module.params['select_crypto_backend']
if backend == 'auto':
# Detect what backend we can use
can_use_cryptography = CRYPTOGRAPHY_FOUND and CRYPTOGRAPHY_VERSION >= LooseVersion(MINIMAL_CRYPTOGRAPHY_VERSION)
can_use_pyopenssl = PYOPENSSL_FOUND and PYOPENSSL_VERSION >= LooseVersion(MINIMAL_PYOPENSSL_VERSION)
# If cryptography is available we'll use it
if can_use_cryptography:
backend = 'cryptography'
elif can_use_pyopenssl:
backend = 'pyopenssl'
# Fail if no backend has been found
if backend == 'auto':
module.fail_json(msg=("Can't detect any of the required Python libraries "
"cryptography (>= {0}) or PyOpenSSL (>= {1})").format(
MINIMAL_CRYPTOGRAPHY_VERSION,
MINIMAL_PYOPENSSL_VERSION))
if backend == 'pyopenssl':
if not PYOPENSSL_FOUND:
module.fail_json(msg=missing_required_lib('pyOpenSSL >= {0}'.format(MINIMAL_PYOPENSSL_VERSION)),
exception=PYOPENSSL_IMP_ERR)
try:
getattr(crypto.X509Req, 'get_extensions')
except AttributeError:
module.fail_json(msg='You need to have PyOpenSSL>=0.15')
module.deprecate('The module is using the PyOpenSSL backend. This backend has been deprecated', version='2.13')
certificate = CertificateSigningRequestInfoPyOpenSSL(module)
elif backend == 'cryptography':
if not CRYPTOGRAPHY_FOUND:
module.fail_json(msg=missing_required_lib('cryptography >= {0}'.format(MINIMAL_CRYPTOGRAPHY_VERSION)),
exception=CRYPTOGRAPHY_IMP_ERR)
certificate = CertificateSigningRequestInfoCryptography(module)
result = certificate.get_info()
module.exit_json(**result)
except crypto_utils.OpenSSLObjectError as exc:
module.fail_json(msg=to_native(exc))
if __name__ == "__main__":
main()
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