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cloud-init/SOURCES/ci-Azure-Retrieve-username-and-hostname-from-IMDS-865.patch

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import cloud-init-21.1-19.el9
2022-05-17 08:38:23 +00:00
From 68f058e8d20a499f74bc78af8e0c6a90ca57ae20 Mon Sep 17 00:00:00 2001
From: Thomas Stringer <thstring@microsoft.com>
Date: Mon, 26 Apr 2021 09:41:38 -0400
Subject: [PATCH 5/7] Azure: Retrieve username and hostname from IMDS (#865)
RH-Author: Eduardo Otubo <otubo@redhat.com>
RH-MergeRequest: 18: Add support for userdata on Azure from IMDS
RH-Commit: [5/7] 6a768d31e63e5f00dae0fad2712a7618d62b0879 (otubo/cloud-init-src)
RH-Bugzilla: 2042351
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
This change allows us to retrieve the username and hostname from
IMDS instead of having to rely on the mounted OVF.
---
cloudinit/sources/DataSourceAzure.py | 149 ++++++++++++++----
tests/unittests/test_datasource/test_azure.py | 87 +++++++++-
2 files changed, 205 insertions(+), 31 deletions(-)
diff --git a/cloudinit/sources/DataSourceAzure.py b/cloudinit/sources/DataSourceAzure.py
index 39e67c4f..6d7954ee 100755
--- a/cloudinit/sources/DataSourceAzure.py
+++ b/cloudinit/sources/DataSourceAzure.py
@@ -5,6 +5,7 @@
# This file is part of cloud-init. See LICENSE file for license information.
import base64
+from collections import namedtuple
import contextlib
import crypt
from functools import partial
@@ -25,6 +26,7 @@ from cloudinit.net import device_driver
from cloudinit.net.dhcp import EphemeralDHCPv4
from cloudinit import sources
from cloudinit.sources.helpers import netlink
+from cloudinit import ssh_util
from cloudinit import subp
from cloudinit.url_helper import UrlError, readurl, retry_on_url_exc
from cloudinit import util
@@ -80,7 +82,12 @@ AGENT_SEED_DIR = '/var/lib/waagent'
IMDS_TIMEOUT_IN_SECONDS = 2
IMDS_URL = "http://169.254.169.254/metadata"
IMDS_VER_MIN = "2019-06-01"
-IMDS_VER_WANT = "2020-09-01"
+IMDS_VER_WANT = "2020-10-01"
+
+
+# This holds SSH key data including if the source was
+# from IMDS, as well as the SSH key data itself.
+SSHKeys = namedtuple("SSHKeys", ("keys_from_imds", "ssh_keys"))
class metadata_type(Enum):
@@ -391,6 +398,8 @@ class DataSourceAzure(sources.DataSource):
"""Return the subplatform metadata source details."""
if self.seed.startswith('/dev'):
subplatform_type = 'config-disk'
+ elif self.seed.lower() == 'imds':
+ subplatform_type = 'imds'
else:
subplatform_type = 'seed-dir'
return '%s (%s)' % (subplatform_type, self.seed)
@@ -433,9 +442,11 @@ class DataSourceAzure(sources.DataSource):
found = None
reprovision = False
+ ovf_is_accessible = True
reprovision_after_nic_attach = False
for cdev in candidates:
try:
+ LOG.debug("cdev: %s", cdev)
if cdev == "IMDS":
ret = None
reprovision = True
@@ -462,8 +473,18 @@ class DataSourceAzure(sources.DataSource):
raise sources.InvalidMetaDataException(msg)
except util.MountFailedError:
report_diagnostic_event(
- '%s was not mountable' % cdev, logger_func=LOG.warning)
- continue
+ '%s was not mountable' % cdev, logger_func=LOG.debug)
+ cdev = 'IMDS'
+ ovf_is_accessible = False
+ empty_md = {'local-hostname': ''}
+ empty_cfg = dict(
+ system_info=dict(
+ default_user=dict(
+ name=''
+ )
+ )
+ )
+ ret = (empty_md, '', empty_cfg, {})
report_diagnostic_event("Found provisioning metadata in %s" % cdev,
logger_func=LOG.debug)
@@ -490,6 +511,10 @@ class DataSourceAzure(sources.DataSource):
self.fallback_interface,
retries=10
)
+ if not imds_md and not ovf_is_accessible:
+ msg = 'No OVF or IMDS available'
+ report_diagnostic_event(msg)
+ raise sources.InvalidMetaDataException(msg)
(md, userdata_raw, cfg, files) = ret
self.seed = cdev
crawled_data.update({
@@ -498,6 +523,21 @@ class DataSourceAzure(sources.DataSource):
'metadata': util.mergemanydict(
[md, {'imds': imds_md}]),
'userdata_raw': userdata_raw})
+ imds_username = _username_from_imds(imds_md)
+ imds_hostname = _hostname_from_imds(imds_md)
+ imds_disable_password = _disable_password_from_imds(imds_md)
+ if imds_username:
+ LOG.debug('Username retrieved from IMDS: %s', imds_username)
+ cfg['system_info']['default_user']['name'] = imds_username
+ if imds_hostname:
+ LOG.debug('Hostname retrieved from IMDS: %s', imds_hostname)
+ crawled_data['metadata']['local-hostname'] = imds_hostname
+ if imds_disable_password:
+ LOG.debug(
+ 'Disable password retrieved from IMDS: %s',
+ imds_disable_password
+ )
+ crawled_data['metadata']['disable_password'] = imds_disable_password # noqa: E501
found = cdev
report_diagnostic_event(
@@ -676,6 +716,13 @@ class DataSourceAzure(sources.DataSource):
@azure_ds_telemetry_reporter
def get_public_ssh_keys(self):
+ """
+ Retrieve public SSH keys.
+ """
+
+ return self._get_public_ssh_keys_and_source().ssh_keys
+
+ def _get_public_ssh_keys_and_source(self):
"""
Try to get the ssh keys from IMDS first, and if that fails
(i.e. IMDS is unavailable) then fallback to getting the ssh
@@ -685,30 +732,50 @@ class DataSourceAzure(sources.DataSource):
advantage, so this is a strong preference. But we must keep
OVF as a second option for environments that don't have IMDS.
"""
+
LOG.debug('Retrieving public SSH keys')
ssh_keys = []
+ keys_from_imds = True
+ LOG.debug('Attempting to get SSH keys from IMDS')
try:
- raise KeyError(
- "Not using public SSH keys from IMDS"
- )
- # pylint:disable=unreachable
ssh_keys = [
public_key['keyData']
for public_key
in self.metadata['imds']['compute']['publicKeys']
]
- LOG.debug('Retrieved SSH keys from IMDS')
+ for key in ssh_keys:
+ if not _key_is_openssh_formatted(key=key):
+ keys_from_imds = False
+ break
+
+ if not keys_from_imds:
+ log_msg = 'Keys not in OpenSSH format, using OVF'
+ else:
+ log_msg = 'Retrieved {} keys from IMDS'.format(
+ len(ssh_keys)
+ if ssh_keys is not None
+ else 0
+ )
except KeyError:
log_msg = 'Unable to get keys from IMDS, falling back to OVF'
+ keys_from_imds = False
+ finally:
report_diagnostic_event(log_msg, logger_func=LOG.debug)
+
+ if not keys_from_imds:
+ LOG.debug('Attempting to get SSH keys from OVF')
try:
ssh_keys = self.metadata['public-keys']
- LOG.debug('Retrieved keys from OVF')
+ log_msg = 'Retrieved {} keys from OVF'.format(len(ssh_keys))
except KeyError:
log_msg = 'No keys available from OVF'
+ finally:
report_diagnostic_event(log_msg, logger_func=LOG.debug)
- return ssh_keys
+ return SSHKeys(
+ keys_from_imds=keys_from_imds,
+ ssh_keys=ssh_keys
+ )
def get_config_obj(self):
return self.cfg
@@ -1325,30 +1392,21 @@ class DataSourceAzure(sources.DataSource):
self.bounce_network_with_azure_hostname()
pubkey_info = None
- try:
- raise KeyError(
- "Not using public SSH keys from IMDS"
- )
- # pylint:disable=unreachable
- public_keys = self.metadata['imds']['compute']['publicKeys']
- LOG.debug(
- 'Successfully retrieved %s key(s) from IMDS',
- len(public_keys)
- if public_keys is not None
+ ssh_keys_and_source = self._get_public_ssh_keys_and_source()
+
+ if not ssh_keys_and_source.keys_from_imds:
+ pubkey_info = self.cfg.get('_pubkeys', None)
+ log_msg = 'Retrieved {} fingerprints from OVF'.format(
+ len(pubkey_info)
+ if pubkey_info is not None
else 0
)
- except KeyError:
- LOG.debug(
- 'Unable to retrieve SSH keys from IMDS during '
- 'negotiation, falling back to OVF'
- )
- pubkey_info = self.cfg.get('_pubkeys', None)
+ report_diagnostic_event(log_msg, logger_func=LOG.debug)
metadata_func = partial(get_metadata_from_fabric,
fallback_lease_file=self.
dhclient_lease_file,
- pubkey_info=pubkey_info,
- iso_dev=self.iso_dev)
+ pubkey_info=pubkey_info)
LOG.debug("negotiating with fabric via agent command %s",
self.ds_cfg['agent_command'])
@@ -1404,6 +1462,41 @@ class DataSourceAzure(sources.DataSource):
return self.metadata.get('imds', {}).get('compute', {}).get('location')
+def _username_from_imds(imds_data):
+ try:
+ return imds_data['compute']['osProfile']['adminUsername']
+ except KeyError:
+ return None
+
+
+def _hostname_from_imds(imds_data):
+ try:
+ return imds_data['compute']['osProfile']['computerName']
+ except KeyError:
+ return None
+
+
+def _disable_password_from_imds(imds_data):
+ try:
+ return imds_data['compute']['osProfile']['disablePasswordAuthentication'] == 'true' # noqa: E501
+ except KeyError:
+ return None
+
+
+def _key_is_openssh_formatted(key):
+ """
+ Validate whether or not the key is OpenSSH-formatted.
+ """
+
+ parser = ssh_util.AuthKeyLineParser()
+ try:
+ akl = parser.parse(key)
+ except TypeError:
+ return False
+
+ return akl.keytype is not None
+
+
def _partitions_on_device(devpath, maxnum=16):
# return a list of tuples (ptnum, path) for each part on devpath
for suff in ("-part", "p", ""):
diff --git a/tests/unittests/test_datasource/test_azure.py b/tests/unittests/test_datasource/test_azure.py
index 320fa857..d9817d84 100644
--- a/tests/unittests/test_datasource/test_azure.py
+++ b/tests/unittests/test_datasource/test_azure.py
@@ -108,7 +108,7 @@ NETWORK_METADATA = {
"zone": "",
"publicKeys": [
{
- "keyData": "key1",
+ "keyData": "ssh-rsa key1",
"path": "path1"
}
]
@@ -1761,8 +1761,29 @@ scbus-1 on xpt0 bus 0
dsrc.get_data()
dsrc.setup(True)
ssh_keys = dsrc.get_public_ssh_keys()
- # Temporarily alter this test so that SSH public keys
- # from IMDS are *not* going to be in use to fix a regression.
+ self.assertEqual(ssh_keys, ["ssh-rsa key1"])
+ self.assertEqual(m_parse_certificates.call_count, 0)
+
+ @mock.patch(
+ 'cloudinit.sources.helpers.azure.OpenSSLManager.parse_certificates')
+ @mock.patch(MOCKPATH + 'get_metadata_from_imds')
+ def test_get_public_ssh_keys_with_no_openssh_format(
+ self,
+ m_get_metadata_from_imds,
+ m_parse_certificates):
+ imds_data = copy.deepcopy(NETWORK_METADATA)
+ imds_data['compute']['publicKeys'][0]['keyData'] = 'no-openssh-format'
+ m_get_metadata_from_imds.return_value = imds_data
+ sys_cfg = {'datasource': {'Azure': {'apply_network_config': True}}}
+ odata = {'HostName': "myhost", 'UserName': "myuser"}
+ data = {
+ 'ovfcontent': construct_valid_ovf_env(data=odata),
+ 'sys_cfg': sys_cfg
+ }
+ dsrc = self._get_ds(data)
+ dsrc.get_data()
+ dsrc.setup(True)
+ ssh_keys = dsrc.get_public_ssh_keys()
self.assertEqual(ssh_keys, [])
self.assertEqual(m_parse_certificates.call_count, 0)
@@ -1818,6 +1839,66 @@ scbus-1 on xpt0 bus 0
self.assertIsNotNone(dsrc.metadata)
self.assertFalse(dsrc.failed_desired_api_version)
+ @mock.patch(MOCKPATH + 'get_metadata_from_imds')
+ def test_hostname_from_imds(self, m_get_metadata_from_imds):
+ sys_cfg = {'datasource': {'Azure': {'apply_network_config': True}}}
+ odata = {'HostName': "myhost", 'UserName': "myuser"}
+ data = {
+ 'ovfcontent': construct_valid_ovf_env(data=odata),
+ 'sys_cfg': sys_cfg
+ }
+ imds_data_with_os_profile = copy.deepcopy(NETWORK_METADATA)
+ imds_data_with_os_profile["compute"]["osProfile"] = dict(
+ adminUsername="username1",
+ computerName="hostname1",
+ disablePasswordAuthentication="true"
+ )
+ m_get_metadata_from_imds.return_value = imds_data_with_os_profile
+ dsrc = self._get_ds(data)
+ dsrc.get_data()
+ self.assertEqual(dsrc.metadata["local-hostname"], "hostname1")
+
+ @mock.patch(MOCKPATH + 'get_metadata_from_imds')
+ def test_username_from_imds(self, m_get_metadata_from_imds):
+ sys_cfg = {'datasource': {'Azure': {'apply_network_config': True}}}
+ odata = {'HostName': "myhost", 'UserName': "myuser"}
+ data = {
+ 'ovfcontent': construct_valid_ovf_env(data=odata),
+ 'sys_cfg': sys_cfg
+ }
+ imds_data_with_os_profile = copy.deepcopy(NETWORK_METADATA)
+ imds_data_with_os_profile["compute"]["osProfile"] = dict(
+ adminUsername="username1",
+ computerName="hostname1",
+ disablePasswordAuthentication="true"
+ )
+ m_get_metadata_from_imds.return_value = imds_data_with_os_profile
+ dsrc = self._get_ds(data)
+ dsrc.get_data()
+ self.assertEqual(
+ dsrc.cfg["system_info"]["default_user"]["name"],
+ "username1"
+ )
+
+ @mock.patch(MOCKPATH + 'get_metadata_from_imds')
+ def test_disable_password_from_imds(self, m_get_metadata_from_imds):
+ sys_cfg = {'datasource': {'Azure': {'apply_network_config': True}}}
+ odata = {'HostName': "myhost", 'UserName': "myuser"}
+ data = {
+ 'ovfcontent': construct_valid_ovf_env(data=odata),
+ 'sys_cfg': sys_cfg
+ }
+ imds_data_with_os_profile = copy.deepcopy(NETWORK_METADATA)
+ imds_data_with_os_profile["compute"]["osProfile"] = dict(
+ adminUsername="username1",
+ computerName="hostname1",
+ disablePasswordAuthentication="true"
+ )
+ m_get_metadata_from_imds.return_value = imds_data_with_os_profile
+ dsrc = self._get_ds(data)
+ dsrc.get_data()
+ self.assertTrue(dsrc.metadata["disable_password"])
+
class TestAzureBounce(CiTestCase):
--
2.27.0
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