From dee08141f250f078eb891080e11fef163cd056e1 Mon Sep 17 00:00:00 2001 From: Joshua Watt Date: Fri, 8 Jul 2022 13:47:36 +0200 Subject: classes/cve-check: Move get_patches_cves to library Moving the function will allow other classes to capture which CVEs have been patched, in particular SBoM generation. Also add a function to capture the CPE ID from the CVE Product and Version (From OE-Core rev: 75d34259a715120be1d023e4fd7b6b4b125f2443) (From OE-Core rev: bba069463ca3813666d084643b0239b9af0199e1) Signed-off-by: Joshua Watt Signed-off-by: Alexandre Belloni Signed-off-by: Richard Purdie (cherry picked from commit fa6c07bc1a585f204dbdc28704f61448edb8fdc8) Signed-off-by: Akash Hadke Signed-off-by: Steve Sakoman Signed-off-by: Richard Purdie --- meta/lib/oe/cve_check.py | 82 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) (limited to 'meta/lib') diff --git a/meta/lib/oe/cve_check.py b/meta/lib/oe/cve_check.py index b17390de90..a4b831831b 100644 --- a/meta/lib/oe/cve_check.py +++ b/meta/lib/oe/cve_check.py @@ -89,3 +89,85 @@ def update_symlinks(target_path, link_path): if os.path.exists(os.path.realpath(link_path)): os.remove(link_path) os.symlink(os.path.basename(target_path), link_path) + +def get_patched_cves(d): + """ + Get patches that solve CVEs using the "CVE: " tag. + """ + + import re + import oe.patch + + pn = d.getVar("PN") + cve_match = re.compile("CVE:( CVE\-\d{4}\-\d+)+") + + # Matches the last "CVE-YYYY-ID" in the file name, also if written + # in lowercase. Possible to have multiple CVE IDs in a single + # file name, but only the last one will be detected from the file name. + # However, patch files contents addressing multiple CVE IDs are supported + # (cve_match regular expression) + + cve_file_name_match = re.compile(".*([Cc][Vv][Ee]\-\d{4}\-\d+)") + + patched_cves = set() + bb.debug(2, "Looking for patches that solves CVEs for %s" % pn) + for url in oe.patch.src_patches(d): + patch_file = bb.fetch.decodeurl(url)[2] + + if not os.path.isfile(patch_file): + bb.error("File Not found: %s" % patch_file) + raise FileNotFoundError + + # Check patch file name for CVE ID + fname_match = cve_file_name_match.search(patch_file) + if fname_match: + cve = fname_match.group(1).upper() + patched_cves.add(cve) + bb.debug(2, "Found CVE %s from patch file name %s" % (cve, patch_file)) + + with open(patch_file, "r", encoding="utf-8") as f: + try: + patch_text = f.read() + except UnicodeDecodeError: + bb.debug(1, "Failed to read patch %s using UTF-8 encoding" + " trying with iso8859-1" % patch_file) + f.close() + with open(patch_file, "r", encoding="iso8859-1") as f: + patch_text = f.read() + + # Search for one or more "CVE: " lines + text_match = False + for match in cve_match.finditer(patch_text): + # Get only the CVEs without the "CVE: " tag + cves = patch_text[match.start()+5:match.end()] + for cve in cves.split(): + bb.debug(2, "Patch %s solves %s" % (patch_file, cve)) + patched_cves.add(cve) + text_match = True + + if not fname_match and not text_match: + bb.debug(2, "Patch %s doesn't solve CVEs" % patch_file) + + return patched_cves + + +def get_cpe_ids(cve_product, version): + """ + Get list of CPE identifiers for the given product and version + """ + + version = version.split("+git")[0] + + cpe_ids = [] + for product in cve_product.split(): + # CVE_PRODUCT in recipes may include vendor information for CPE identifiers. If not, + # use wildcard for vendor. + if ":" in product: + vendor, product = product.split(":", 1) + else: + vendor = "*" + + cpe_id = f'cpe:2.3:a:{vendor}:{product}:{version}:*:*:*:*:*:*:*' + cpe_ids.append(cpe_id) + + return cpe_ids -- cgit v1.2.3-54-g00ecf