org_fedora_oscap.common._() - Code Metrics - Inspection of "Merge rhel7 branch into master." - OpenSCAP/oscap-anaconda-addon - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#68)

by Matěj

created 2018-06-15 09:33 UTC

org_fedora_oscap.common._() A

↳ Parent: org_fedora_oscap.common

Complexity

Conditions

Size

Total Lines	5
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	4
nop	1
dl	0
loc	5
rs	9.4285
c	0
b	0
f	0

#
# Copyright (C) 2013  Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.  You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
# Red Hat Author(s): Vratislav Podzimek <[email protected]>
#

"""
Module with various classes and functions needed by the OSCAP addon that are
not specific to any installation mode (tui, gui, ks).

"""

import os
import tempfile
import subprocess
import zipfile
import tarfile
import cpioarchive
import re
import logging

from collections import namedtuple
import gettext
from functools import wraps
from pyanaconda.core import constants
from pyanaconda import nm
from pyanaconda.threading import threadMgr, AnacondaThread
from org_fedora_oscap import utils
from org_fedora_oscap.data_fetch import fetch_data

log = logging.getLogger("anaconda")


# mimick pyanaconda/core/i18n.py
def _(string):
    if string:
        return gettext.translation("oscap-anaconda-addon", fallback=True).gettext(string)
    else:
        return ""


def N_(string): return string


# everything else should be private
__all__ = ["run_oscap_remediate", "get_fix_rules_pre",
           "wait_and_fetch_net_data", "extract_data", "strip_content_dir",
           "OSCAPaddonError"]

INSTALLATION_CONTENT_DIR = "/tmp/openscap_data/"
TARGET_CONTENT_DIR = "/root/openscap_data/"

SSG_DIR = "/usr/share/xml/scap/ssg/content/"
SSG_CONTENT = "ssg-rhel7-ds.xml"
if constants.shortProductName != 'anaconda':
    if constants.shortProductName == 'fedora':
        SSG_CONTENT  = "ssg-fedora-ds.xml"
    else:
        SSG_CONTENT = "ssg-%s%s-ds.xml" % (constants.shortProductName,
                                            constants.productVersion.strip(".")[0])

RESULTS_PATH = utils.join_paths(TARGET_CONTENT_DIR,
                                "eval_remediate_results.xml")
REPORT_PATH = utils.join_paths(TARGET_CONTENT_DIR,
                               "eval_remediate_report.html")

PRE_INSTALL_FIX_SYSTEM_ATTR = "urn:redhat:anaconda:pre"

THREAD_FETCH_DATA = "AnaOSCAPdataFetchThread"

SUPPORTED_ARCHIVES = (".zip", ".tar", ".tar.gz", ".tar.bz2", )

# buffer size for reading and writing out data (in bytes)
IO_BUF_SIZE = 2 * 1024 * 1024


class OSCAPaddonError(Exception):
    """Exception class for OSCAP addon related errors."""

    pass


class OSCAPaddonNetworkError(OSCAPaddonError):
    """Exception class for OSCAP addon related network errors."""

    pass


class ExtractionError(OSCAPaddonError):
    """Exception class for the extraction errors."""

    pass


MESSAGE_TYPE_FATAL = 0
MESSAGE_TYPE_WARNING = 1
MESSAGE_TYPE_INFO = 2

# namedtuple for messages returned from the rules evaluation
#   origin -- class (inherited from RuleHandler) that generated the message
#   type -- one of the MESSAGE_TYPE_* constants defined above
#   text -- the actual message that should be displayed, logged, ...
RuleMessage = namedtuple("RuleMessage", ["origin", "type", "text"])


def get_fix_rules_pre(profile, fpath, ds_id="", xccdf_id="", tailoring=""):
    """
    Get fix rules for the pre-installation environment for a given profile in a
    given datastream and checklist in a given file.

    :see: run_oscap_remediate
    :see: _run_oscap_gen_fix
    :return: fix rules for a given profile
    :rtype: str

    """

    return _run_oscap_gen_fix(profile, fpath, PRE_INSTALL_FIX_SYSTEM_ATTR,
                              ds_id=ds_id, xccdf_id=xccdf_id,
                              tailoring=tailoring)


def _run_oscap_gen_fix(profile, fpath, template, ds_id="", xccdf_id="",
                       tailoring=""):
    """
    Run oscap tool on a given file to get the contents of fix elements with the
    'system' attribute equal to a given template for a given datastream,
    checklist and profile.

    :see: run_oscap_remediate
    :param template: the value of the 'system' attribute of the fix elements
    :type template: str
    :return: oscap tool's stdout
    :rtype: str

    """

    if not profile:
        return ""

    args = ["oscap", "xccdf", "generate", "fix"]
    args.append("--template=%s" % template)

    # oscap uses the default profile by default
    if profile.lower() != "default":
        args.append("--profile=%s" % profile)
    if ds_id:
        args.append("--datastream-id=%s" % ds_id)
    if xccdf_id:
        args.append("--xccdf-id=%s" % xccdf_id)
    if tailoring:
        args.append("--tailoring-file=%s" % tailoring)

    args.append(fpath)

    try:
        proc = subprocess.Popen(args, stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE)
    except OSError as oserr:
        msg = "Failed to run the oscap tool: %s" % oserr
        raise OSCAPaddonError(msg)

    (stdout, stderr) = proc.communicate()
    stdout_str = stdout.decode()
    stderr_str = stderr.decode()

    messages = re.findall(r'OpenSCAP Error:.*', stderr_str)
    if messages:
        for message in messages:
            log.warning("OSCAP addon: " + message)

    # pylint thinks Popen has no attribute returncode
    # pylint: disable-msg=E1101
    if proc.returncode != 0:
        msg = "Failed to generate fix rules with the oscap tool: %s" % stderr_str
        raise OSCAPaddonError(msg)

    return stdout_str


def run_oscap_remediate(profile, fpath, ds_id="", xccdf_id="", tailoring="",
                        chroot=""):
    """
    Run the evaluation and remediation with the oscap tool on a given file,
    doing the remediation as defined in a given profile defined in a given
    checklist that is a part of a given datastream. If requested, run in
    chroot.

    :param profile: id of the profile that will drive the remediation
    :type profile: str
    :param fpath: path to a file with SCAP content
    :type fpath: str
    :param ds_id: ID of the datastream that contains the checklist defining
                  the profile
    :type ds_id: str
    :param xccdf_id: ID of the checklist that defines the profile
    :type xccdf_id: str
    :param tailoring: path to a tailoring file
    :type tailoring: str
    :param chroot: path to the root the oscap tool should be run in
    :type chroot: str
    :return: oscap tool's stdout (summary of the rules, checks and fixes)
    :rtype: str

    """

    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:
        results_dir = os.path.normpath(chroot + "/" + results_dir)
    utils.ensure_dir_exists(results_dir)

    args = ["oscap", "xccdf", "eval"]
    args.append("--remediate")
    args.append("--results=%s" % RESULTS_PATH)
    args.append("--report=%s" % REPORT_PATH)

    # oscap uses the default profile by default
    if profile.lower() != "default":
        args.append("--profile=%s" % profile)
    if ds_id:
        args.append("--datastream-id=%s" % ds_id)
    if xccdf_id:
        args.append("--xccdf-id=%s" % xccdf_id)
    if tailoring:
        args.append("--tailoring-file=%s" % tailoring)

    args.append(fpath)

    try:
        proc = subprocess.Popen(args,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,
                                preexec_fn=do_chroot)
    except OSError as oserr:
        msg = "Failed to run the oscap tool: %s" % oserr
        raise OSCAPaddonError(msg)

    (stdout, stderr) = proc.communicate()

    messages = re.findall(r'OpenSCAP Error:.*', stderr)
    if messages:
        for message in messages:
            log.warning("OSCAP addon: " + message)

    # save stdout?
    # pylint thinks Popen has no attribute returncode
    # pylint: disable-msg=E1101
    if proc.returncode not in (0, 2):
        # 0 -- success; 2 -- no error, but checks/remediation failed
        msg = "Content evaluation and remediation with the oscap tool "\
            "failed: %s" % stderr
        raise OSCAPaddonError(msg)

    return stdout


def wait_and_fetch_net_data(url, out_file, ca_certs=None):
    """
    Function that waits for network connection and starts a thread that fetches
    data over network.

    :see: org_fedora_oscap.data_fetch.fetch_data
    :return: the name of the thread running fetch_data
    :rtype: str

    """

    # get thread that tries to establish a network connection
    nm_conn_thread = threadMgr.get(constants.THREAD_WAIT_FOR_CONNECTING_NM)
    if nm_conn_thread:
        # NM still connecting, wait for it to finish
        nm_conn_thread.join()

    if not nm.nm_is_connected():
        raise OSCAPaddonNetworkError("Network connection needed to fetch data.")

    fetch_data_thread = AnacondaThread(name=THREAD_FETCH_DATA,
                                       target=fetch_data,
                                       args=(url, out_file, ca_certs),
                                       fatal=False)

    # register and run the thread
    threadMgr.add(fetch_data_thread)

    return THREAD_FETCH_DATA


def extract_data(archive, out_dir, ensure_has_files=None):
    """
    Fuction that extracts the given archive to the given output directory. It
    tries to find out the archive type by the file name.

    :param archive: path to the archive file that should be extracted
    :type archive: str
    :param out_dir: output directory the archive should be extracted to
    :type out_dir: str
    :param ensure_has_files: relative paths to the files that must exist in the
                             archive
    :type ensure_has_files: iterable of strings or None
    :return: a list of files and directories extracted from the archive
    :rtype: [str]

    """

    # get rid of empty file paths
    ensure_has_files = [fpath for fpath in ensure_has_files if fpath]

    if archive.endswith(".zip"):
        # ZIP file
        try:
            zfile = zipfile.ZipFile(archive, "r")
        except zipfile.BadZipfile as err:
            raise ExtractionError(str(err))

        # generator for the paths of the files found in the archive (dirs end
        # with "/")
        files = set(info.filename for info in zfile.filelist
                    if not info.filename.endswith("/"))
        for fpath in ensure_has_files or ():
            if fpath not in files:
                msg = "File '%s' not found in the archive '%s'" % (fpath,
                                                                   archive)
                raise ExtractionError(msg)

        utils.ensure_dir_exists(out_dir)
        zfile.extractall(path=out_dir)
        result = [utils.join_paths(out_dir, info.filename) for info in zfile.filelist]
        zfile.close()
        return result
    elif archive.endswith(".tar"):
        # plain tarball
        return _extract_tarball(archive, out_dir, ensure_has_files, None)
    elif archive.endswith(".tar.gz"):
        # gzipped tarball
        return _extract_tarball(archive, out_dir, ensure_has_files, "gz")
    elif archive.endswith(".tar.bz2"):
        # bzipped tarball
        return _extract_tarball(archive, out_dir, ensure_has_files, "bz2")
    elif archive.endswith(".rpm"):
        # RPM
        return _extract_rpm(archive, out_dir, ensure_has_files)
    # elif other types of archives
    else:
        raise ExtractionError("Unsuported archive type")


def _extract_tarball(archive, out_dir, ensure_has_files, alg):
    """
    Extract the given TAR archive to the given output directory and make sure
    the given file exists in the archive.

    :see: extract_data
    :param alg: compression algorithm used for the tarball
    :type alg: str (one of "gz", "bz2") or None
    :return: a list of files and directories extracted from the archive
    :rtype: [str]

    """

    if alg and alg not in ("gz", "bz2",):
        raise ExtractionError("Unsupported compression algorithm")

    mode = "r"
    if alg:
        mode += ":%s" % alg

    try:
        tfile = tarfile.TarFile.open(archive, mode)
    except tarfile.TarError as err:
        raise ExtractionError(str(err))

    # generator for the paths of the files found in the archive
    files = set(member.path for member in tfile.getmembers()
                if member.isfile())

    for fpath in ensure_has_files or ():
        if fpath not in files:
            msg = "File '%s' not found in the archive '%s'" % (fpath, archive)
            raise ExtractionError(msg)

    utils.ensure_dir_exists(out_dir)
    tfile.extractall(path=out_dir)
    result = [utils.join_paths(out_dir, member.path) for member in tfile.getmembers()]
    tfile.close()

    return result


def _extract_rpm(rpm_path, root="/", ensure_has_files=None):
    """
    Extract the given RPM into the directory tree given by the root argument
    and make sure the given file exists in the archive.

    :param rpm_path: path to the RPM file that should be extracted
    :type rpm_path: str
    :param root: root of the directory tree the RPM should be extracted into
    :type root: str
    :param ensure_has_files: relative paths to the files that must exist in the
                             RPM
    :type ensure_has_files: iterable of strings or None
    :return: a list of files and directories extracted from the archive
    :rtype: [str]

    """

    # run rpm2cpio and process the output with the cpioarchive module
    temp_fd, temp_path = tempfile.mkstemp(prefix="oscap_rpm")
    proc = subprocess.Popen(["rpm2cpio", rpm_path], stdout=temp_fd)
    proc.wait()
    if proc.returncode != 0:
        msg = "Failed to convert RPM '%s' to cpio archive" % rpm_path
        raise ExtractionError(msg)

    os.close(temp_fd)

    try:
        archive = cpioarchive.CpioArchive(temp_path)
    except cpioarchive.CpioError as err:
        raise ExtractionError(str(err))

    # get entries from the archive (supports only iteration over entries)
    entries = set(entry for entry in archive)

    # cpio entry names (paths) start with the dot
    entry_names = [entry.name.lstrip(".") for entry in entries]

    for fpath in ensure_has_files or ():
        # RPM->cpio entries have absolute paths
        if fpath not in entry_names and \
           os.path.join("/", fpath) not in entry_names:
            msg = "File '%s' not found in the archive '%s'" % (fpath, rpm_path)
            raise ExtractionError(msg)

    try:
        for entry in entries:
            dirname = os.path.dirname(entry.name.lstrip("."))
            out_dir = os.path.normpath(root + dirname)
            utils.ensure_dir_exists(out_dir)

            out_fpath = os.path.normpath(root + entry.name.lstrip("."))
            if os.path.exists(out_fpath):
                continue
            with open(out_fpath, "wb") as out_file:
                buf = entry.read(IO_BUF_SIZE)
                while buf:
                    out_file.write(buf)
                    buf = entry.read(IO_BUF_SIZE)
    except (IOError, cpioarchive.CpioError) as e:
        raise ExtractionError(e)

    # cleanup
    archive.close()
    os.unlink(temp_path)

    return [os.path.normpath(root + name) for name in entry_names]


def strip_content_dir(fpaths, phase="preinst"):
    """
    Strip content directory prefix from the file paths for either
    pre-installation or post-installation phase.

    :param fpaths: iterable of file paths to strip content directory prefix
                   from
    :type fpaths: iterable of strings
    :param phase: specifies pre-installation or post-installation phase
    :type phase: "preinst" or "postinst"
    :return: the same iterable of file paths as given with the content
             directory prefix stripped
    :rtype: same type as fpaths

    """

    if phase == "preinst":
        remove_prefix = lambda x: x[len(INSTALLATION_CONTENT_DIR):]
    else:
        remove_prefix = lambda x: x[len(TARGET_CONTENT_DIR):]

    return utils.keep_type_map(remove_prefix, fpaths)


def ssg_available(root="/"):
    """
    Tries to find the SCAP Security Guide under the given root.

    :return: True if SSG was found under the given root, False otherwise

    """

    return os.path.exists(utils.join_paths(root, SSG_DIR + SSG_CONTENT))


def dry_run_skip(func):
    """
    Decorator that makes sure the decorated function is noop in the dry-run
    mode.

    :param func: a decorated function that needs to have the first parameter an
                 object with the _addon_data attribute referencing the OSCAP
                 addon's ksdata
    """

    @wraps(func)
    def decorated(self, *args, **kwargs):
        if self._addon_data.dry_run:
            return
        else:
            return func(self, *args, **kwargs)

    return decorated


1			#
2			# Copyright (C) 2013 Red Hat, Inc.
3			#
4			# This copyrighted material is made available to anyone wishing to use,
5			# modify, copy, or redistribute it subject to the terms and conditions of
6			# the GNU General Public License v.2, or (at your option) any later version.
7			# This program is distributed in the hope that it will be useful, but WITHOUT
8			# ANY WARRANTY expressed or implied, including the implied warranties of
9			# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
10			# Public License for more details. You should have received a copy of the
11			# GNU General Public License along with this program; if not, write to the
12			# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
13			# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
14			# source code or documentation are not subject to the GNU General Public
15			# License and may only be used or replicated with the express permission of
16			# Red Hat, Inc.
17			#
18			# Red Hat Author(s): Vratislav Podzimek <[email protected]>
19			#
20
21			"""
22			Module with various classes and functions needed by the OSCAP addon that are
23			not specific to any installation mode (tui, gui, ks).
24
25			"""
26
27			import os
28			import tempfile
29			import subprocess
30			import zipfile
31			import tarfile
32			import cpioarchive
33			import re
34			import logging
35
36			from collections import namedtuple
37			import gettext
38			from functools import wraps
39			from pyanaconda.core import constants
40			from pyanaconda import nm
41			from pyanaconda.threading import threadMgr, AnacondaThread
42			from org_fedora_oscap import utils
43			from org_fedora_oscap.data_fetch import fetch_data
44
45			log = logging.getLogger("anaconda")
46
47
48			# mimick pyanaconda/core/i18n.py
49			def _(string):
50			if string:
51			return gettext.translation("oscap-anaconda-addon", fallback=True).gettext(string)
52			else:
53			return ""
54
55
56			def N_(string): return string
57
58
59			# everything else should be private
60			__all__ = ["run_oscap_remediate", "get_fix_rules_pre",
61			"wait_and_fetch_net_data", "extract_data", "strip_content_dir",
62			"OSCAPaddonError"]
63
64			INSTALLATION_CONTENT_DIR = "/tmp/openscap_data/"
65			TARGET_CONTENT_DIR = "/root/openscap_data/"
66
67			SSG_DIR = "/usr/share/xml/scap/ssg/content/"
68			SSG_CONTENT = "ssg-rhel7-ds.xml"
69			if constants.shortProductName != 'anaconda':
70			if constants.shortProductName == 'fedora':
71			SSG_CONTENT = "ssg-fedora-ds.xml"
72			else:
73			SSG_CONTENT = "ssg-%s%s-ds.xml" % (constants.shortProductName,
74			constants.productVersion.strip(".")[0])
75
76			RESULTS_PATH = utils.join_paths(TARGET_CONTENT_DIR,
77			"eval_remediate_results.xml")
78			REPORT_PATH = utils.join_paths(TARGET_CONTENT_DIR,
79			"eval_remediate_report.html")
80
81			PRE_INSTALL_FIX_SYSTEM_ATTR = "urn:redhat:anaconda:pre"
82
83			THREAD_FETCH_DATA = "AnaOSCAPdataFetchThread"
84
85			SUPPORTED_ARCHIVES = (".zip", ".tar", ".tar.gz", ".tar.bz2", )
86
87			# buffer size for reading and writing out data (in bytes)
88			IO_BUF_SIZE = 2 * 1024 * 1024
89
90
91			class OSCAPaddonError(Exception):
92			"""Exception class for OSCAP addon related errors."""
93
94			pass
95
96
97			class OSCAPaddonNetworkError(OSCAPaddonError):
98			"""Exception class for OSCAP addon related network errors."""
99
100			pass
101
102
103			class ExtractionError(OSCAPaddonError):
104			"""Exception class for the extraction errors."""
105
106			pass
107
108
109			MESSAGE_TYPE_FATAL = 0
110			MESSAGE_TYPE_WARNING = 1
111			MESSAGE_TYPE_INFO = 2
112
113			# namedtuple for messages returned from the rules evaluation
114			# origin -- class (inherited from RuleHandler) that generated the message
115			# type -- one of the MESSAGE_TYPE_* constants defined above
116			# text -- the actual message that should be displayed, logged, ...
117			RuleMessage = namedtuple("RuleMessage", ["origin", "type", "text"])
118
119
120			def get_fix_rules_pre(profile, fpath, ds_id="", xccdf_id="", tailoring=""):
121			"""
122			Get fix rules for the pre-installation environment for a given profile in a
123			given datastream and checklist in a given file.
124
125			:see: run_oscap_remediate
126			:see: _run_oscap_gen_fix
127			:return: fix rules for a given profile
128			:rtype: str
129
130			"""
131
132			return _run_oscap_gen_fix(profile, fpath, PRE_INSTALL_FIX_SYSTEM_ATTR,
133			ds_id=ds_id, xccdf_id=xccdf_id,
134			tailoring=tailoring)
135
136
137			def _run_oscap_gen_fix(profile, fpath, template, ds_id="", xccdf_id="",
138			tailoring=""):
139			"""
140			Run oscap tool on a given file to get the contents of fix elements with the
141			'system' attribute equal to a given template for a given datastream,
142			checklist and profile.
143
144			:see: run_oscap_remediate
145			:param template: the value of the 'system' attribute of the fix elements
146			:type template: str
147			:return: oscap tool's stdout
148			:rtype: str
149
150			"""
151
152			if not profile:
153			return ""
154
155			args = ["oscap", "xccdf", "generate", "fix"]
156			args.append("--template=%s" % template)
157
158			# oscap uses the default profile by default
159			if profile.lower() != "default":
160			args.append("--profile=%s" % profile)
161			if ds_id:
162			args.append("--datastream-id=%s" % ds_id)
163			if xccdf_id:
164			args.append("--xccdf-id=%s" % xccdf_id)
165			if tailoring:
166			args.append("--tailoring-file=%s" % tailoring)
167
168			args.append(fpath)
169
170			try:
171			proc = subprocess.Popen(args, stdout=subprocess.PIPE,
172			stderr=subprocess.PIPE)
173			except OSError as oserr:
174			msg = "Failed to run the oscap tool: %s" % oserr
175			raise OSCAPaddonError(msg)
176
177			(stdout, stderr) = proc.communicate()
178			stdout_str = stdout.decode()
179			stderr_str = stderr.decode()
180
181			messages = re.findall(r'OpenSCAP Error:.*', stderr_str)
182			if messages:
183			for message in messages:
184			log.warning("OSCAP addon: " + message)
185
186			# pylint thinks Popen has no attribute returncode
187			# pylint: disable-msg=E1101
188			if proc.returncode != 0:
189			msg = "Failed to generate fix rules with the oscap tool: %s" % stderr_str
190			raise OSCAPaddonError(msg)
191
192			return stdout_str
193
194
195			def run_oscap_remediate(profile, fpath, ds_id="", xccdf_id="", tailoring="",
196			chroot=""):
197			"""
198			Run the evaluation and remediation with the oscap tool on a given file,
199			doing the remediation as defined in a given profile defined in a given
200			checklist that is a part of a given datastream. If requested, run in
201			chroot.
202
203			:param profile: id of the profile that will drive the remediation
204			:type profile: str
205			:param fpath: path to a file with SCAP content
206			:type fpath: str
207			:param ds_id: ID of the datastream that contains the checklist defining
208			the profile
209			:type ds_id: str
210			:param xccdf_id: ID of the checklist that defines the profile
211			:type xccdf_id: str
212			:param tailoring: path to a tailoring file
213			:type tailoring: str
214			:param chroot: path to the root the oscap tool should be run in
215			:type chroot: str
216			:return: oscap tool's stdout (summary of the rules, checks and fixes)
217			:rtype: str
218
219			"""
220
221			if not profile:
222			return ""
223
224			def do_chroot():
225			"""Helper function doing the chroot if requested."""
226			if chroot and chroot != "/":
227			os.chroot(chroot)
228			os.chdir("/")
229
230			# make sure the directory for the results exists
231			results_dir = os.path.dirname(RESULTS_PATH)
232			if chroot:
233			results_dir = os.path.normpath(chroot + "/" + results_dir)
234			utils.ensure_dir_exists(results_dir)
235
236			args = ["oscap", "xccdf", "eval"]
237			args.append("--remediate")
238			args.append("--results=%s" % RESULTS_PATH)
239			args.append("--report=%s" % REPORT_PATH)
240
241			# oscap uses the default profile by default
242			if profile.lower() != "default":
243			args.append("--profile=%s" % profile)
244			if ds_id:
245			args.append("--datastream-id=%s" % ds_id)
246			if xccdf_id:
247			args.append("--xccdf-id=%s" % xccdf_id)
248			if tailoring:
249			args.append("--tailoring-file=%s" % tailoring)
250
251			args.append(fpath)
252
253			try:
254			proc = subprocess.Popen(args,
255			stdout=subprocess.PIPE,
256			stderr=subprocess.PIPE,
257			preexec_fn=do_chroot)
258			except OSError as oserr:
259			msg = "Failed to run the oscap tool: %s" % oserr
260			raise OSCAPaddonError(msg)
261
262			(stdout, stderr) = proc.communicate()
263
264			messages = re.findall(r'OpenSCAP Error:.*', stderr)
265			if messages:
266			for message in messages:
267			log.warning("OSCAP addon: " + message)
268
269			# save stdout?
270			# pylint thinks Popen has no attribute returncode
271			# pylint: disable-msg=E1101
272			if proc.returncode not in (0, 2):
273			# 0 -- success; 2 -- no error, but checks/remediation failed
274			msg = "Content evaluation and remediation with the oscap tool "\
275			"failed: %s" % stderr
276			raise OSCAPaddonError(msg)
277
278			return stdout
279
280
281			def wait_and_fetch_net_data(url, out_file, ca_certs=None):
282			"""
283			Function that waits for network connection and starts a thread that fetches
284			data over network.
285
286			:see: org_fedora_oscap.data_fetch.fetch_data
287			:return: the name of the thread running fetch_data
288			:rtype: str
289
290			"""
291
292			# get thread that tries to establish a network connection
293			nm_conn_thread = threadMgr.get(constants.THREAD_WAIT_FOR_CONNECTING_NM)
294			if nm_conn_thread:
295			# NM still connecting, wait for it to finish
296			nm_conn_thread.join()
297
298			if not nm.nm_is_connected():
299			raise OSCAPaddonNetworkError("Network connection needed to fetch data.")
300
301			fetch_data_thread = AnacondaThread(name=THREAD_FETCH_DATA,
302			target=fetch_data,
303			args=(url, out_file, ca_certs),
304			fatal=False)
305
306			# register and run the thread
307			threadMgr.add(fetch_data_thread)
308
309			return THREAD_FETCH_DATA
310
311
312			def extract_data(archive, out_dir, ensure_has_files=None):
313			"""
314			Fuction that extracts the given archive to the given output directory. It
315			tries to find out the archive type by the file name.
316
317			:param archive: path to the archive file that should be extracted
318			:type archive: str
319			:param out_dir: output directory the archive should be extracted to
320			:type out_dir: str
321			:param ensure_has_files: relative paths to the files that must exist in the
322			archive
323			:type ensure_has_files: iterable of strings or None
324			:return: a list of files and directories extracted from the archive
325			:rtype: [str]
326
327			"""
328
329			# get rid of empty file paths
330			ensure_has_files = [fpath for fpath in ensure_has_files if fpath]
331
332			if archive.endswith(".zip"):
333			# ZIP file
334			try:
335			zfile = zipfile.ZipFile(archive, "r")
336			except zipfile.BadZipfile as err:
337			raise ExtractionError(str(err))
338
339			# generator for the paths of the files found in the archive (dirs end
340			# with "/")
341			files = set(info.filename for info in zfile.filelist
342			if not info.filename.endswith("/"))
343			for fpath in ensure_has_files or ():
344			if fpath not in files:
345			msg = "File '%s' not found in the archive '%s'" % (fpath,
346			archive)
347			raise ExtractionError(msg)
348
349			utils.ensure_dir_exists(out_dir)
350			zfile.extractall(path=out_dir)
351			result = [utils.join_paths(out_dir, info.filename) for info in zfile.filelist]
352			zfile.close()
353			return result
354			elif archive.endswith(".tar"):
355			# plain tarball
356			return _extract_tarball(archive, out_dir, ensure_has_files, None)
357			elif archive.endswith(".tar.gz"):
358			# gzipped tarball
359			return _extract_tarball(archive, out_dir, ensure_has_files, "gz")
360			elif archive.endswith(".tar.bz2"):
361			# bzipped tarball
362			return _extract_tarball(archive, out_dir, ensure_has_files, "bz2")
363			elif archive.endswith(".rpm"):
364			# RPM
365			return _extract_rpm(archive, out_dir, ensure_has_files)
366			# elif other types of archives
367			else:
368			raise ExtractionError("Unsuported archive type")
369
370
371			def _extract_tarball(archive, out_dir, ensure_has_files, alg):
372			"""
373			Extract the given TAR archive to the given output directory and make sure
374			the given file exists in the archive.
375
376			:see: extract_data
377			:param alg: compression algorithm used for the tarball
378			:type alg: str (one of "gz", "bz2") or None
379			:return: a list of files and directories extracted from the archive
380			:rtype: [str]
381
382			"""
383
384			if alg and alg not in ("gz", "bz2",):
385			raise ExtractionError("Unsupported compression algorithm")
386
387			mode = "r"
388			if alg:
389			mode += ":%s" % alg
390
391			try:
392			tfile = tarfile.TarFile.open(archive, mode)
393			except tarfile.TarError as err:
394			raise ExtractionError(str(err))
395
396			# generator for the paths of the files found in the archive
397			files = set(member.path for member in tfile.getmembers()
398			if member.isfile())
399
400			for fpath in ensure_has_files or ():
401			if fpath not in files:
402			msg = "File '%s' not found in the archive '%s'" % (fpath, archive)
403			raise ExtractionError(msg)
404
405			utils.ensure_dir_exists(out_dir)
406			tfile.extractall(path=out_dir)
407			result = [utils.join_paths(out_dir, member.path) for member in tfile.getmembers()]
408			tfile.close()
409
410			return result
411
412
413			def _extract_rpm(rpm_path, root="/", ensure_has_files=None):
414			"""
415			Extract the given RPM into the directory tree given by the root argument
416			and make sure the given file exists in the archive.
417
418			:param rpm_path: path to the RPM file that should be extracted
419			:type rpm_path: str
420			:param root: root of the directory tree the RPM should be extracted into
421			:type root: str
422			:param ensure_has_files: relative paths to the files that must exist in the
423			RPM
424			:type ensure_has_files: iterable of strings or None
425			:return: a list of files and directories extracted from the archive
426			:rtype: [str]
427
428			"""
429
430			# run rpm2cpio and process the output with the cpioarchive module
431			temp_fd, temp_path = tempfile.mkstemp(prefix="oscap_rpm")
432			proc = subprocess.Popen(["rpm2cpio", rpm_path], stdout=temp_fd)
433			proc.wait()
434			if proc.returncode != 0:
435			msg = "Failed to convert RPM '%s' to cpio archive" % rpm_path
436			raise ExtractionError(msg)
437
438			os.close(temp_fd)
439
440			try:
441			archive = cpioarchive.CpioArchive(temp_path)
442			except cpioarchive.CpioError as err:
443			raise ExtractionError(str(err))
444
445			# get entries from the archive (supports only iteration over entries)
446			entries = set(entry for entry in archive)
447
448			# cpio entry names (paths) start with the dot
449			entry_names = [entry.name.lstrip(".") for entry in entries]
450
451			for fpath in ensure_has_files or ():
452			# RPM->cpio entries have absolute paths
453			if fpath not in entry_names and \
454			os.path.join("/", fpath) not in entry_names:
455			msg = "File '%s' not found in the archive '%s'" % (fpath, rpm_path)
456			raise ExtractionError(msg)
457
458			try:
459			for entry in entries:
460			dirname = os.path.dirname(entry.name.lstrip("."))
461			out_dir = os.path.normpath(root + dirname)
462			utils.ensure_dir_exists(out_dir)
463
464			out_fpath = os.path.normpath(root + entry.name.lstrip("."))
465			if os.path.exists(out_fpath):
466			continue
467			with open(out_fpath, "wb") as out_file:
468			buf = entry.read(IO_BUF_SIZE)
469			while buf:
470			out_file.write(buf)
471			buf = entry.read(IO_BUF_SIZE)
472			except (IOError, cpioarchive.CpioError) as e:
473			raise ExtractionError(e)
474
475			# cleanup
476			archive.close()
477			os.unlink(temp_path)
478
479			return [os.path.normpath(root + name) for name in entry_names]
480
481
482			def strip_content_dir(fpaths, phase="preinst"):
483			"""
484			Strip content directory prefix from the file paths for either
485			pre-installation or post-installation phase.
486
487			:param fpaths: iterable of file paths to strip content directory prefix
488			from
489			:type fpaths: iterable of strings
490			:param phase: specifies pre-installation or post-installation phase
491			:type phase: "preinst" or "postinst"
492			:return: the same iterable of file paths as given with the content
493			directory prefix stripped
494			:rtype: same type as fpaths
495
496			"""
497
498			if phase == "preinst":
499			remove_prefix = lambda x: x[len(INSTALLATION_CONTENT_DIR):]
500			else:
501			remove_prefix = lambda x: x[len(TARGET_CONTENT_DIR):]
502
503			return utils.keep_type_map(remove_prefix, fpaths)
504
505
506			def ssg_available(root="/"):
507			"""
508			Tries to find the SCAP Security Guide under the given root.
509
510			:return: True if SSG was found under the given root, False otherwise
511
512			"""
513
514			return os.path.exists(utils.join_paths(root, SSG_DIR + SSG_CONTENT))
515
516
517			def dry_run_skip(func):
518			"""
519			Decorator that makes sure the decorated function is noop in the dry-run
520			mode.
521
522			:param func: a decorated function that needs to have the first parameter an
523			object with the _addon_data attribute referencing the OSCAP
524			addon's ksdata
525			"""
526
527			@wraps(func)
528			def decorated(self, args, *kwargs):
529			if self._addon_data.dry_run:
530			return
531			else:
532			return func(self, args, *kwargs)
533
534			return decorated
535

OpenSCAP / oscap-anaconda-addon

Pull Request — master (#68)

org_fedora_oscap.common._() A

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