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From 7d4e16bfc1cefbdd4d1477480b02b1d6c1399e4d Mon Sep 17 00:00:00 2001
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From: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Date: Mon, 20 Sep 2021 12:16:36 +0200
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Subject: [PATCH] ssh_utils.py: ignore when sshd_config options are not
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key/value pairs (#1007)
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RH-Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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RH-MergeRequest: 31: ssh_utils.py: ignore when sshd_config options are not key/value pairs (#1007)
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RH-Commit: [1/1] 9007fb8a116e98036ff17df0168a76e9a5843671 (eesposit/cloud-init)
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RH-Bugzilla: 1862933
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RH-Acked-by: Mohamed Gamal Morsy <mmorsy@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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TESTED: by me
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BREW: 39832462
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commit 2ce857248162957a785af61c135ca8433fdbbcde
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Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Date: Wed Sep 8 02:08:36 2021 +0200
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ssh_utils.py: ignore when sshd_config options are not key/value pairs (#1007)
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As specified in #LP 1845552,
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In cloudinit/ssh_util.py, in parse_ssh_config_lines(), we attempt to
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parse each line of sshd_config. This function expects each line to
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be one of the following forms:
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\# comment
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key value
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key=value
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However, options like DenyGroups and DenyUsers are specified to
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*optionally* accepts values in sshd_config.
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Cloud-init should comply to this and skip the option if a value
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is not provided.
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Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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---
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cloudinit/ssh_util.py | 8 +++++++-
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tests/unittests/test_sshutil.py | 8 ++++++++
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2 files changed, 15 insertions(+), 1 deletion(-)
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diff --git a/cloudinit/ssh_util.py b/cloudinit/ssh_util.py
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index 9ccadf09..33679dcc 100644
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--- a/cloudinit/ssh_util.py
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+++ b/cloudinit/ssh_util.py
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@@ -484,7 +484,13 @@ def parse_ssh_config_lines(lines):
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try:
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key, val = line.split(None, 1)
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except ValueError:
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- key, val = line.split('=', 1)
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+ try:
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+ key, val = line.split('=', 1)
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+ except ValueError:
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+ LOG.debug(
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+ "sshd_config: option \"%s\" has no key/value pair,"
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+ " skipping it", line)
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+ continue
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ret.append(SshdConfigLine(line, key, val))
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return ret
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diff --git a/tests/unittests/test_sshutil.py b/tests/unittests/test_sshutil.py
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index a66788bf..08e20050 100644
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--- a/tests/unittests/test_sshutil.py
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+++ b/tests/unittests/test_sshutil.py
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@@ -525,6 +525,14 @@ class TestUpdateSshConfigLines(test_helpers.CiTestCase):
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self.assertEqual([self.pwauth], result)
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self.check_line(lines[-1], self.pwauth, "no")
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+ def test_option_without_value(self):
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+ """Implementation only accepts key-value pairs."""
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+ extended_exlines = self.exlines.copy()
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+ denyusers_opt = "DenyUsers"
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+ extended_exlines.append(denyusers_opt)
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+ lines = ssh_util.parse_ssh_config_lines(list(extended_exlines))
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+ self.assertNotIn(denyusers_opt, str(lines))
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+
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def test_single_option_updated(self):
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"""A single update should have change made and line updated."""
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opt, val = ("UsePAM", "no")
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--
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2.27.0
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