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From c92205d5a5c788eeac84a6e67956a3e0540ab565 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20T=C3=BD=C4=8D?= <matyc@redhat.com>
Date: Mon, 3 Jan 2022 17:31:49 +0100
Subject: [PATCH 1/2] Add oscap sanity check before attempting remediation
If something is obviously wrong with the scanner, then don't attempt to remediate
and try to show relevant information in a dialog window.
---
org_fedora_oscap/common.py | 39 +++++++++++++++++++-----
org_fedora_oscap/service/installation.py | 11 +++++++
tests/test_common.py | 8 +++++
tests/test_installation.py | 3 +-
4 files changed, 52 insertions(+), 9 deletions(-)
diff --git a/org_fedora_oscap/common.py b/org_fedora_oscap/common.py
index c432168..eeb27fc 100644
--- a/org_fedora_oscap/common.py
+++ b/org_fedora_oscap/common.py
@@ -171,7 +171,8 @@ def execute(self, ** kwargs):
proc = subprocess.Popen(self.args, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, ** kwargs)
except OSError as oserr:
- msg = "Failed to run the oscap tool: %s" % oserr
+ msg = ("Failed to execute command '{command_string}': {oserr}"
+ .format(command_string=command_string, oserr=oserr))
raise OSCAPaddonError(msg)
(stdout, stderr) = proc.communicate()
@@ -247,6 +248,34 @@ def _run_oscap_gen_fix(profile, fpath, template, ds_id="", xccdf_id="",
return proc.stdout
+def do_chroot(chroot):
+ """Helper function doing the chroot if requested."""
+ if chroot and chroot != "/":
+ os.chroot(chroot)
+ os.chdir("/")
+
+
+def assert_scanner_works(chroot, executable="oscap"):
+ args = [executable, "--version"]
+ command = " ".join(args)
+
+ try:
+ proc = subprocess.Popen(
+ args, preexec_fn=lambda: do_chroot(chroot),
+ stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+ (stdout, stderr) = proc.communicate()
+ stderr = stderr.decode(errors="replace")
+ except OSError as exc:
+ msg = _(f"Basic invocation '{command}' fails: {str(exc)}")
+ raise OSCAPaddonError(msg)
+ if proc.returncode != 0:
+ msg = _(
+ f"Basic scanner invocation '{command}' exited "
+ "with non-zero error code {proc.returncode}: {stderr}")
+ raise OSCAPaddonError(msg)
+ return True
+
+
def run_oscap_remediate(profile, fpath, ds_id="", xccdf_id="", tailoring="",
chroot=""):
"""
@@ -276,12 +305,6 @@ def run_oscap_remediate(profile, fpath, ds_id="", xccdf_id="", tailoring="",
if not profile:
return ""
- def do_chroot():
- """Helper function doing the chroot if requested."""
- if chroot and chroot != "/":
- os.chroot(chroot)
- os.chdir("/")
-
# make sure the directory for the results exists
results_dir = os.path.dirname(RESULTS_PATH)
if chroot:
@@ -306,7 +329,7 @@ def do_chroot():
args.append(fpath)
proc = SubprocessLauncher(args)
- proc.execute(preexec_fn=do_chroot)
+ proc.execute(preexec_fn=lambda: do_chroot(chroot))
proc.log_messages()
if proc.returncode not in (0, 2):
diff --git a/org_fedora_oscap/service/installation.py b/org_fedora_oscap/service/installation.py
index 2da8559..d909c44 100644
--- a/org_fedora_oscap/service/installation.py
+++ b/org_fedora_oscap/service/installation.py
@@ -239,6 +239,17 @@ def name(self):
def run(self):
"""Run the task."""
+ try:
+ common.assert_scanner_works(
+ chroot=self._sysroot, executable="oscap")
+ except Exception as exc:
+ msg_lines = [_(
+ "The 'oscap' scanner doesn't work in the installed system: {error}"
+ .format(error=str(exc)))]
+ msg_lines.append(_("As a result, the installed system can't be hardened."))
+ terminate("\n".join(msg_lines))
+ return
+
common.run_oscap_remediate(
self._policy_data.profile_id,
self._target_content_path,
diff --git a/tests/test_common.py b/tests/test_common.py
index 9f7a16a..4f25379 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -77,6 +77,14 @@ def _run_oscap(mock_subprocess, additional_args):
return expected_args, kwargs
+def test_oscap_works():
+ assert common.assert_scanner_works(chroot="/")
+ with pytest.raises(common.OSCAPaddonError, match="No such file"):
+ common.assert_scanner_works(chroot="/", executable="i_dont_exist")
+ with pytest.raises(common.OSCAPaddonError, match="non-zero"):
+ common.assert_scanner_works(chroot="/", executable="false")
+
+
def test_run_oscap_remediate_profile_only(mock_subprocess, monkeypatch):
return run_oscap_remediate_profile(
mock_subprocess, monkeypatch,
diff --git a/tests/test_installation.py b/tests/test_installation.py
index 5749a94..f819c3b 100644
--- a/tests/test_installation.py
+++ b/tests/test_installation.py
@@ -115,4 +115,5 @@ def test_remediate_system_task(sysroot_path, content_path, tailoring_path):
)
assert task.name == "Remediate the system"
- task.run()
+ with pytest.raises(installation.NonCriticalInstallationError, match="No such file"):
+ task.run()
From ea2dbf5017445875b1c0e4ee27899c8dde292c98 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20T=C3=BD=C4=8D?= <matyc@redhat.com>
Date: Mon, 3 Jan 2022 17:42:31 +0100
Subject: [PATCH 2/2] Don't raise exceptions in execute()
Those result in tracebacks during the installation,
while a dialog window presents a more useful form of user interaction.
---
org_fedora_oscap/service/installation.py | 27 ++++++++++++++----------
1 file changed, 16 insertions(+), 11 deletions(-)
diff --git a/org_fedora_oscap/service/installation.py b/org_fedora_oscap/service/installation.py
index d909c44..290da40 100644
--- a/org_fedora_oscap/service/installation.py
+++ b/org_fedora_oscap/service/installation.py
@@ -210,9 +210,9 @@ def run(self):
)
if ret != 0:
- raise common.ExtractionError(
- "Failed to install content RPM to the target system"
- )
+ msg = _(f"Failed to install content RPM to the target system.")
+ terminate(msg)
+ return
else:
pattern = utils.join_paths(common.INSTALLATION_CONTENT_DIR, "*")
utils.universal_copy(pattern, target_content_dir)
@@ -250,11 +250,16 @@ def run(self):
terminate("\n".join(msg_lines))
return
- common.run_oscap_remediate(
- self._policy_data.profile_id,
- self._target_content_path,
- self._policy_data.datastream_id,
- self._policy_data.xccdf_id,
- self._target_tailoring_path,
- chroot=self._sysroot
- )
+ try:
+ common.run_oscap_remediate(
+ self._policy_data.profile_id,
+ self._target_content_path,
+ self._policy_data.datastream_id,
+ self._policy_data.xccdf_id,
+ self._target_tailoring_path,
+ chroot=self._sysroot
+ )
+ except Exception as exc:
+ msg = _(f"Something went wrong during the final hardening: {str(exc)}.")
+ terminate(msg)
+ return
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