mirror of
https://github.com/falcosecurity/falco.git
synced 2025-10-22 03:49:36 +00:00
73fbbdb577
Add automated tests for running falco from a package and container. As a
result, this will also test building the kernel module as well as
runnning falco-probe-loader as a backup.
In travis.yml, switch to the docker-enabled vm and install dkms. This
changed the environment slightly, so change how avocado's python
dependencies are installed. After building falco, copy the .deb package
to docker/local and build a local docker image based on that package.
Add the following new tests:
- docker_package: this uses "docker run" to run the image created in
travis.yml. This includes using dkms to build the kernel module and
load it. In addition, the conf directory is mounted to /host/conf, the
rules directory is mounted to /host/rules, and the traces directory is
mounted to /host/traces.
- docker_package_local_driver: this disables dkms via a volume mount
that maps /dev/null to /usr/sbin/dkms and copies the kernel module by
hand into the container to /root/.sysdig/falco-probe-....ko. As a
result, falco-probe-loader will use the local kernel module instead
of building one itself.
- debian_package: this installs the .deb package and runs the installed
version of falco.
Ideally, there'd also be a test for downloading the driver, but since
the driver depends on the kernel as well as the falco version string,
you can't put a single driver on download.draios.com that will work
long-term.
These tests depend on the following new test attributes:
- package: if present, this points to the docker image/debian package
to install.
- addl_docker_run_args: if present, will be added to the docker run
command.
- copy_local_driver: if present, will copy the built kernel module to
~/.sysdig. ~/.sysdig/* is always cleared out before each test.
- run_duration: maps to falco's -M <secs> flag
- trace_file is now optional.
Also add some misc general test changes:
- Clean up our use of process.run. By default it will fail a test if the
run program returns non-zero, so we don't have to grab the exit
status. In addition, get rid of sudo in the command lines and use the
sudo attribute instead.
- Fix some tests that were writing to files below /tmp/falco_outputs
by creating the directory first. Useful when running avocado directly.
397 lines
16 KiB
Python
397 lines
16 KiB
Python
#!/usr/bin/env python
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import os
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import re
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import json
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import sets
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import glob
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import shutil
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import subprocess
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from avocado import Test
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from avocado.utils import process
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from avocado.utils import linux_modules
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class FalcoTest(Test):
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def setUp(self):
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"""
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Load the sysdig kernel module if not already loaded.
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"""
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self.falcodir = self.params.get('falcodir', '/', default=os.path.join(self.basedir, '../build'))
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self.stdout_contains = self.params.get('stdout_contains', '*', default='')
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self.stderr_contains = self.params.get('stderr_contains', '*', default='')
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self.exit_status = self.params.get('exit_status', '*', default=0)
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self.should_detect = self.params.get('detect', '*', default=False)
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self.trace_file = self.params.get('trace_file', '*', default='')
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if self.trace_file and not os.path.isabs(self.trace_file):
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self.trace_file = os.path.join(self.basedir, self.trace_file)
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self.json_output = self.params.get('json_output', '*', default=False)
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self.rules_file = self.params.get('rules_file', '*', default=os.path.join(self.basedir, '../rules/falco_rules.yaml'))
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if not isinstance(self.rules_file, list):
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self.rules_file = [self.rules_file]
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self.rules_args = ""
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for file in self.rules_file:
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if not os.path.isabs(file):
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file = os.path.join(self.basedir, file)
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self.rules_args = self.rules_args + "-r " + file + " "
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self.conf_file = self.params.get('conf_file', '*', default=os.path.join(self.basedir, '../falco.yaml'))
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if not os.path.isabs(self.conf_file):
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self.conf_file = os.path.join(self.basedir, self.conf_file)
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self.run_duration = self.params.get('run_duration', '*', default='')
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self.disabled_rules = self.params.get('disabled_rules', '*', default='')
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if self.disabled_rules == '':
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self.disabled_rules = []
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if not isinstance(self.disabled_rules, list):
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self.disabled_rules = [self.disabled_rules]
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self.disabled_args = ""
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for rule in self.disabled_rules:
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self.disabled_args = self.disabled_args + "-D " + rule + " "
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self.detect_counts = self.params.get('detect_counts', '*', default=False)
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if self.detect_counts == False:
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self.detect_counts = {}
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else:
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detect_counts = {}
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for item in self.detect_counts:
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for item2 in item:
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detect_counts[item2[0]] = item2[1]
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self.detect_counts = detect_counts
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self.rules_warning = self.params.get('rules_warning', '*', default=False)
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if self.rules_warning == False:
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self.rules_warning = sets.Set()
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else:
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self.rules_warning = sets.Set(self.rules_warning)
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# Maps from rule name to set of evttypes
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self.rules_events = self.params.get('rules_events', '*', default=False)
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if self.rules_events == False:
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self.rules_events = {}
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else:
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events = {}
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for item in self.rules_events:
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for item2 in item:
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events[item2[0]] = sets.Set(item2[1])
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self.rules_events = events
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if self.should_detect:
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self.detect_level = self.params.get('detect_level', '*')
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if not isinstance(self.detect_level, list):
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self.detect_level = [self.detect_level]
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self.package = self.params.get('package', '*', default='None')
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if self.package == 'None':
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# Doing this in 2 steps instead of simply using
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# module_is_loaded to avoid logging lsmod output to the log.
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lsmod_output = process.system_output("lsmod", verbose=False)
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if linux_modules.parse_lsmod_for_module(lsmod_output, 'falco_probe') == {}:
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self.log.debug("Loading falco kernel module")
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process.run('insmod {}/driver/falco-probe.ko'.format(self.falcodir), sudo=True)
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self.addl_docker_run_args = self.params.get('addl_docker_run_args', '*', default='')
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self.copy_local_driver = self.params.get('copy_local_driver', '*', default=False)
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# Used by possibly_copy_local_driver as well as docker run
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self.module_dir = os.path.expanduser("~/.sysdig")
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self.outputs = self.params.get('outputs', '*', default='')
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if self.outputs == '':
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self.outputs = {}
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else:
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outputs = []
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for item in self.outputs:
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for item2 in item:
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output = {}
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output['file'] = item2[0]
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output['line'] = item2[1]
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outputs.append(output)
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filedir = os.path.dirname(output['file'])
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# Create the parent directory for the trace file if it doesn't exist.
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if not os.path.isdir(filedir):
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os.makedirs(filedir)
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self.outputs = outputs
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self.disable_tags = self.params.get('disable_tags', '*', default='')
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if self.disable_tags == '':
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self.disable_tags=[]
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self.run_tags = self.params.get('run_tags', '*', default='')
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if self.run_tags == '':
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self.run_tags=[]
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def tearDown(self):
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if self.package != 'None':
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self.uninstall_package()
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def check_rules_warnings(self, res):
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found_warning = sets.Set()
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for match in re.finditer('Rule ([^:]+): warning \(([^)]+)\):', res.stderr):
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rule = match.group(1)
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warning = match.group(2)
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found_warning.add(rule)
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self.log.debug("Expected warning rules: {}".format(self.rules_warning))
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self.log.debug("Actual warning rules: {}".format(found_warning))
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if found_warning != self.rules_warning:
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self.fail("Expected rules with warnings {} does not match actual rules with warnings {}".format(self.rules_warning, found_warning))
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def check_rules_events(self, res):
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found_events = {}
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for match in re.finditer('Event types for rule ([^:]+): (\S+)', res.stderr):
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rule = match.group(1)
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events = sets.Set(match.group(2).split(","))
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found_events[rule] = events
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self.log.debug("Expected events for rules: {}".format(self.rules_events))
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self.log.debug("Actual events for rules: {}".format(found_events))
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for rule in found_events.keys():
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if found_events.get(rule) != self.rules_events.get(rule):
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self.fail("rule {}: expected events {} differs from actual events {}".format(rule, self.rules_events.get(rule), found_events.get(rule)))
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def check_detections(self, res):
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# Get the number of events detected.
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match = re.search('Events detected: (\d+)', res.stdout)
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if match is None:
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self.fail("Could not find a line 'Events detected: <count>' in falco output")
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events_detected = int(match.group(1))
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if not self.should_detect and events_detected > 0:
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self.fail("Detected {} events when should have detected none".format(events_detected))
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if self.should_detect:
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if events_detected == 0:
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self.fail("Detected {} events when should have detected > 0".format(events_detected))
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for level in self.detect_level:
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level_line = '(?i){}: (\d+)'.format(level)
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match = re.search(level_line, res.stdout)
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if match is None:
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self.fail("Could not find a line '{}: <count>' in falco output".format(level))
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events_detected = int(match.group(1))
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if not events_detected > 0:
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self.fail("Detected {} events at level {} when should have detected > 0".format(events_detected, level))
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def check_detections_by_rule(self, res):
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# Get the number of events detected for each rule. Must match the expected counts.
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match = re.search('Triggered rules by rule name:(.*)', res.stdout, re.DOTALL)
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if match is None:
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self.fail("Could not find a block 'Triggered rules by rule name: ...' in falco output")
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triggered_rules = match.group(1)
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for rule, count in self.detect_counts.iteritems():
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expected = '{}: (\d+)'.format(rule)
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match = re.search(expected, triggered_rules)
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if match is None:
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actual_count = 0
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else:
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actual_count = int(match.group(1))
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if actual_count != count:
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self.fail("Different counts for rule {}: expected={}, actual={}".format(rule, count, actual_count))
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else:
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self.log.debug("Found expected count for rule {}: {}".format(rule, count))
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def check_outputs(self):
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for output in self.outputs:
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# Open the provided file and match each line against the
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# regex in line.
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file = open(output['file'], 'r')
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found = False
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for line in file:
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match = re.search(output['line'], line)
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if match is not None:
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found = True
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if found == False:
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self.fail("Could not find a line '{}' in file '{}'".format(output['line'], output['file']))
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return True
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def check_json_output(self, res):
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if self.json_output:
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# Just verify that any lines starting with '{' are valid json objects.
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# Doesn't do any deep inspection of the contents.
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for line in res.stdout.splitlines():
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if line.startswith('{'):
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obj = json.loads(line)
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for attr in ['time', 'rule', 'priority', 'output']:
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if not attr in obj:
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self.fail("Falco JSON object {} does not contain property \"{}\"".format(line, attr))
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def install_package(self):
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if self.package.startswith("docker:"):
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image = self.package.split(":", 1)[1]
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# Remove an existing falco-test container first. Note we don't check the output--docker rm
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# doesn't have an -i equivalent.
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res = process.run("docker rm falco-test", ignore_status=True)
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rules_dir = os.path.abspath(os.path.join(self.basedir, "./rules"))
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conf_dir = os.path.abspath(os.path.join(self.basedir, "../"))
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traces_dir = os.path.abspath(os.path.join(self.basedir, "./trace_files"))
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self.falco_binary_path = "docker run -i -t --name falco-test --privileged " \
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"-v {}:/host/rules -v {}:/host/conf -v {}:/host/traces " \
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"-v /var/run/docker.sock:/host/var/run/docker.sock " \
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"-v /dev:/host/dev -v /proc:/host/proc:ro -v /boot:/host/boot:ro " \
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"-v /lib/modules:/host/lib/modules:ro -v {}:/root/.sysdig:ro -v " \
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"/usr:/host/usr:ro {} {} falco".format(
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rules_dir, conf_dir, traces_dir,
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self.module_dir, self.addl_docker_run_args, image)
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elif self.package.endswith(".deb"):
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self.falco_binary_path = '/usr/bin/falco';
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package_glob = "{}/{}".format(self.falcodir, self.package)
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matches = glob.glob(package_glob)
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if len(matches) != 1:
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self.fail("Package path {} did not match exactly 1 file. Instead it matched: {}", package_glob, ",".join(matches))
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package_path = matches[0]
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cmdline = "dpkg -i {}".format(package_path)
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self.log.debug("Installing debian package via \"{}\"".format(cmdline))
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res = process.run(cmdline, timeout=120, sudo=True)
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def uninstall_package(self):
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if self.package.startswith("docker:"):
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# Remove the falco-test image. Here we *do* check the return value
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res = process.run("docker rm falco-test")
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elif self.package.endswith(".deb"):
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cmdline = "dpkg -r falco"
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self.log.debug("Uninstalling debian package via \"{}\"".format(cmdline))
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res = process.run(cmdline, timeout=120, sudo=True)
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def possibly_copy_driver(self):
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# Remove the contents of ~/.sysdig regardless of
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# copy_local_driver.
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self.log.debug("Checking for module dir {}".format(self.module_dir))
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if os.path.isdir(self.module_dir):
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self.log.info("Removing files below directory {}".format(self.module_dir))
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for rmfile in glob.glob(self.module_dir + "/*"):
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self.log.debug("Removing file {}".format(rmfile))
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os.remove(rmfile)
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if self.copy_local_driver:
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verstr = subprocess.check_output([self.falco_binary_path, "--version"]).rstrip()
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self.log.info("verstr {}".format(verstr))
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falco_version = verstr.split(" ")[2]
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self.log.info("falco_version {}".format(falco_version))
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arch = subprocess.check_output(["uname", "-m"]).rstrip()
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self.log.info("arch {}".format(arch))
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kernel_release = subprocess.check_output(["uname", "-r"]).rstrip()
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self.log.info("kernel release {}".format(kernel_release))
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# sysdig-probe-loader has a more comprehensive set of ways to
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# find the config hash. We only look at /boot/config-<kernel release>
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md5_output = subprocess.check_output(["md5sum", "/boot/config-{}".format(kernel_release)]).rstrip()
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config_hash = md5_output.split(" ")[0]
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probe_filename = "falco-probe-{}-{}-{}-{}.ko".format(falco_version, arch, kernel_release, config_hash)
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driver_path = os.path.join(self.falcodir, "driver", "falco-probe.ko")
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module_path = os.path.join(self.module_dir, probe_filename)
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self.log.debug("Copying {} to {}".format(driver_path, module_path))
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shutil.copyfile(driver_path, module_path)
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def test(self):
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self.log.info("Trace file %s", self.trace_file)
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self.falco_binary_path = '{}/userspace/falco/falco'.format(self.falcodir)
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self.possibly_copy_driver()
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if self.package != 'None':
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# This sets falco_binary_path as a side-effect.
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self.install_package()
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trace_arg = self.trace_file
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if self.trace_file:
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trace_arg = "-e {}".format(self.trace_file)
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# Run falco
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cmd = '{} {} {} -c {} {} -o json_output={} -v'.format(
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self.falco_binary_path, self.rules_args, self.disabled_args, self.conf_file, trace_arg, self.json_output)
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for tag in self.disable_tags:
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cmd += ' -T {}'.format(tag)
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for tag in self.run_tags:
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cmd += ' -t {}'.format(tag)
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if self.run_duration:
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cmd += ' -M {}'.format(self.run_duration)
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self.falco_proc = process.SubProcess(cmd)
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res = self.falco_proc.run(timeout=180, sig=9)
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if self.stderr_contains != '':
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match = re.search(self.stderr_contains, res.stderr)
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if match is None:
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self.fail("Stderr of falco process did not contain content matching {}".format(self.stderr_contains))
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if self.stdout_contains != '':
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match = re.search(self.stdout_contains, res.stdout)
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if match is None:
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self.fail("Stdout of falco process '{}' did not contain content matching {}".format(res.stdout, self.stdout_contains))
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if res.exit_status != self.exit_status:
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self.error("Falco command \"{}\" exited with unexpected return value {} (!= {})".format(
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cmd, res.exit_status, self.exit_status))
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# No need to check any outputs if the falco process exited abnormally.
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if res.exit_status != 0:
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return
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self.check_rules_warnings(res)
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if len(self.rules_events) > 0:
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self.check_rules_events(res)
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self.check_detections(res)
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if len(self.detect_counts) > 0:
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self.check_detections_by_rule(res)
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self.check_json_output(res)
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self.check_outputs()
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pass
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if __name__ == "__main__":
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main()
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