271 lines
9.5 KiB
Plaintext
271 lines
9.5 KiB
Plaintext
# This class is used to check recipes against public CVEs.
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#
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# In order to use this class just inherit the class in the
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# local.conf file and it will add the cve_check task for
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# every recipe. The task can be used per recipe, per image,
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# or using the special cases "world" and "universe". The
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# cve_check task will print a warning for every unpatched
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# CVE found and generate a file in the recipe WORKDIR/cve
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# directory. If an image is build it will generate a report
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# in DEPLOY_DIR_IMAGE for all the packages used.
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#
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# Example:
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# bitbake -c cve_check openssl
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# bitbake core-image-sato
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# bitbake -k -c cve_check universe
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#
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# DISCLAIMER
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#
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# This class/tool is meant to be used as support and not
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# the only method to check against CVEs. Running this tool
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# doesn't guarantee your packages are free of CVEs.
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# The product name that the CVE database uses. Defaults to BPN, but may need to
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# be overriden per recipe (for example tiff.bb sets CVE_PRODUCT=libtiff).
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CVE_PRODUCT ??= "${BPN}"
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CVE_CHECK_DB_DIR ?= "${DL_DIR}/CVE_CHECK"
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CVE_CHECK_DB_FILE ?= "${CVE_CHECK_DB_DIR}/nvd.db"
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CVE_CHECK_LOCAL_DIR ?= "${WORKDIR}/cve"
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CVE_CHECK_LOCAL_FILE ?= "${CVE_CHECK_LOCAL_DIR}/cve.log"
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CVE_CHECK_TMP_FILE ?= "${TMPDIR}/cve_check"
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CVE_CHECK_DIR ??= "${DEPLOY_DIR}/cve"
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CVE_CHECK_MANIFEST ?= "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.cve"
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CVE_CHECK_COPY_FILES ??= "1"
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CVE_CHECK_CREATE_MANIFEST ??= "1"
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# Whitelist for packages (PN)
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CVE_CHECK_PN_WHITELIST = "\
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glibc-locale \
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"
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# Whitelist for CVE and version of package
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CVE_CHECK_CVE_WHITELIST = "{\
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'CVE-2014-2524': ('6.3','5.2',), \
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}"
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python do_cve_check () {
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"""
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Check recipe for patched and unpatched CVEs
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"""
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if os.path.exists(d.getVar("CVE_CHECK_TMP_FILE")):
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patched_cves = get_patches_cves(d)
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patched, unpatched = check_cves(d, patched_cves)
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if patched or unpatched:
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cve_data = get_cve_info(d, patched + unpatched)
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cve_write_data(d, patched, unpatched, cve_data)
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else:
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bb.note("Failed to update CVE database, skipping CVE check")
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}
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addtask cve_check after do_unpack before do_build
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do_cve_check[depends] = "cve-check-tool-native:do_populate_sysroot cve-check-tool-native:do_populate_cve_db"
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do_cve_check[nostamp] = "1"
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python cve_check_cleanup () {
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"""
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Delete the file used to gather all the CVE information.
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"""
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bb.utils.remove(e.data.getVar("CVE_CHECK_TMP_FILE"))
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}
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addhandler cve_check_cleanup
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cve_check_cleanup[eventmask] = "bb.cooker.CookerExit"
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python cve_check_write_rootfs_manifest () {
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"""
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Create CVE manifest when building an image
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"""
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import shutil
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if os.path.exists(d.getVar("CVE_CHECK_TMP_FILE")):
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bb.note("Writing rootfs CVE manifest")
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deploy_dir = d.getVar("DEPLOY_DIR_IMAGE")
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link_name = d.getVar("IMAGE_LINK_NAME")
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manifest_name = d.getVar("CVE_CHECK_MANIFEST")
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cve_tmp_file = d.getVar("CVE_CHECK_TMP_FILE")
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shutil.copyfile(cve_tmp_file, manifest_name)
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if manifest_name and os.path.exists(manifest_name):
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manifest_link = os.path.join(deploy_dir, "%s.cve" % link_name)
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# If we already have another manifest, update symlinks
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if os.path.exists(os.path.realpath(manifest_link)):
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os.remove(manifest_link)
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os.symlink(os.path.basename(manifest_name), manifest_link)
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bb.plain("Image CVE report stored in: %s" % manifest_name)
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}
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ROOTFS_POSTPROCESS_COMMAND_prepend = "${@'cve_check_write_rootfs_manifest; ' if d.getVar('CVE_CHECK_CREATE_MANIFEST') == '1' else ''}"
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def get_patches_cves(d):
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"""
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Get patches that solve CVEs using the "CVE: " tag.
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"""
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import re
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pn = d.getVar("PN")
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cve_match = re.compile("CVE:( CVE\-\d{4}\-\d+)+")
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patched_cves = set()
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bb.debug(2, "Looking for patches that solves CVEs for %s" % pn)
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for url in src_patches(d):
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patch_file = bb.fetch.decodeurl(url)[2]
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with open(patch_file, "r", encoding="utf-8") as f:
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try:
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patch_text = f.read()
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except UnicodeDecodeError:
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bb.debug(1, "Failed to read patch %s using UTF-8 encoding"
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" trying with iso8859-1" % patch_file)
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f.close()
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with open(patch_file, "r", encoding="iso8859-1") as f:
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patch_text = f.read()
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# Search for the "CVE: " line
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match = cve_match.search(patch_text)
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if match:
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# Get only the CVEs without the "CVE: " tag
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cves = patch_text[match.start()+5:match.end()]
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for cve in cves.split():
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bb.debug(2, "Patch %s solves %s" % (patch_file, cve))
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patched_cves.add(cve)
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else:
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bb.debug(2, "Patch %s doesn't solve CVEs" % patch_file)
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return patched_cves
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def check_cves(d, patched_cves):
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"""
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Run cve-check-tool looking for patched and unpatched CVEs.
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"""
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import ast, csv, tempfile, subprocess, io
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cves_patched = []
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cves_unpatched = []
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bpn = d.getVar("CVE_PRODUCT")
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pv = d.getVar("PV").split("git+")[0]
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cves = " ".join(patched_cves)
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cve_db_dir = d.getVar("CVE_CHECK_DB_DIR")
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cve_whitelist = ast.literal_eval(d.getVar("CVE_CHECK_CVE_WHITELIST"))
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cve_cmd = "cve-check-tool"
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cmd = [cve_cmd, "--no-html", "--csv", "--not-affected", "-t", "faux", "-d", cve_db_dir]
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# If the recipe has been whitlisted we return empty lists
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if d.getVar("PN") in d.getVar("CVE_CHECK_PN_WHITELIST").split():
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bb.note("Recipe has been whitelisted, skipping check")
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return ([], [])
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# It is needed to export the proxies to download the database using HTTP
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bb.utils.export_proxies(d)
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try:
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# Write the faux CSV file to be used with cve-check-tool
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fd, faux = tempfile.mkstemp(prefix="cve-faux-")
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with os.fdopen(fd, "w") as f:
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f.write("%s,%s,%s," % (bpn, pv, cves))
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cmd.append(faux)
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output = subprocess.check_output(cmd, stderr=subprocess.STDOUT).decode("utf-8")
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bb.debug(2, "Output of command %s:\n%s" % ("\n".join(cmd), output))
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except subprocess.CalledProcessError as e:
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bb.warn("Couldn't check for CVEs: %s (output %s)" % (e, e.output))
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finally:
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os.remove(faux)
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for row in csv.reader(io.StringIO(output)):
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# Third row has the unpatched CVEs
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if row[2]:
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for cve in row[2].split():
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# Skip if the CVE has been whitlisted for the current version
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if pv in cve_whitelist.get(cve,[]):
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bb.note("%s-%s has been whitelisted for %s" % (bpn, pv, cve))
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else:
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cves_unpatched.append(cve)
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bb.debug(2, "%s-%s is not patched for %s" % (bpn, pv, cve))
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# Fourth row has patched CVEs
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if row[3]:
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for cve in row[3].split():
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cves_patched.append(cve)
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bb.debug(2, "%s-%s is patched for %s" % (bpn, pv, cve))
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return (cves_patched, cves_unpatched)
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def get_cve_info(d, cves):
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"""
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Get CVE information from the database used by cve-check-tool.
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Unfortunately the only way to get CVE info is set the output to
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html (hard to parse) or query directly the database.
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"""
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try:
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import sqlite3
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except ImportError:
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from pysqlite2 import dbapi2 as sqlite3
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cve_data = {}
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db_file = d.getVar("CVE_CHECK_DB_FILE")
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placeholder = ",".join("?" * len(cves))
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query = "SELECT * FROM NVD WHERE id IN (%s)" % placeholder
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conn = sqlite3.connect(db_file)
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cur = conn.cursor()
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for row in cur.execute(query, tuple(cves)):
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cve_data[row[0]] = {}
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cve_data[row[0]]["summary"] = row[1]
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cve_data[row[0]]["score"] = row[2]
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cve_data[row[0]]["modified"] = row[3]
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cve_data[row[0]]["vector"] = row[4]
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conn.close()
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return cve_data
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def cve_write_data(d, patched, unpatched, cve_data):
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"""
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Write CVE information in WORKDIR; and to CVE_CHECK_DIR, and
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CVE manifest if enabled.
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"""
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cve_file = d.getVar("CVE_CHECK_LOCAL_FILE")
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nvd_link = "https://web.nvd.nist.gov/view/vuln/detail?vulnId="
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write_string = ""
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unpatched_cves = []
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bb.utils.mkdirhier(d.getVar("CVE_CHECK_LOCAL_DIR"))
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for cve in sorted(cve_data):
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write_string += "PACKAGE NAME: %s\n" % d.getVar("PN")
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write_string += "PACKAGE VERSION: %s\n" % d.getVar("PV")
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write_string += "CVE: %s\n" % cve
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if cve in patched:
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write_string += "CVE STATUS: Patched\n"
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else:
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unpatched_cves.append(cve)
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write_string += "CVE STATUS: Unpatched\n"
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write_string += "CVE SUMMARY: %s\n" % cve_data[cve]["summary"]
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write_string += "CVSS v2 BASE SCORE: %s\n" % cve_data[cve]["score"]
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write_string += "VECTOR: %s\n" % cve_data[cve]["vector"]
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write_string += "MORE INFORMATION: %s%s\n\n" % (nvd_link, cve)
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if unpatched_cves:
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bb.warn("Found unpatched CVE (%s), for more information check %s" % (" ".join(unpatched_cves),cve_file))
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with open(cve_file, "w") as f:
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bb.note("Writing file %s with CVE information" % cve_file)
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f.write(write_string)
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if d.getVar("CVE_CHECK_COPY_FILES") == "1":
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cve_dir = d.getVar("CVE_CHECK_DIR")
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bb.utils.mkdirhier(cve_dir)
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deploy_file = os.path.join(cve_dir, d.getVar("PN"))
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with open(deploy_file, "w") as f:
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f.write(write_string)
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if d.getVar("CVE_CHECK_CREATE_MANIFEST") == "1":
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with open(d.getVar("CVE_CHECK_TMP_FILE"), "a") as f:
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f.write("%s" % write_string)
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