1 files changed, 107 insertions, 74 deletions

diff --git a/meta/classes/cve-check.bbclass b/meta/classes/cve-check.bbclass
index 743bc08a4f..19ed5548b3 100644
--- a/meta/classes/cve-check.bbclass
+++ b/meta/classes/cve-check.bbclass
@@ -26,7 +26,7 @@ CVE_PRODUCT ??= "${BPN}"
 CVE_VERSION ??= "${PV}"
 
 CVE_CHECK_DB_DIR ?= "${DL_DIR}/CVE_CHECK"
-CVE_CHECK_DB_FILE ?= "${CVE_CHECK_DB_DIR}/nvd.db"
+CVE_CHECK_DB_FILE ?= "${CVE_CHECK_DB_DIR}/nvdcve_1.0.db"
 
 CVE_CHECK_LOG ?= "${T}/cve.log"
 CVE_CHECK_TMP_FILE ?= "${TMPDIR}/cve_check"
@@ -37,39 +37,39 @@ CVE_CHECK_COPY_FILES ??= "1"
 CVE_CHECK_CREATE_MANIFEST ??= "1"
 
 # Whitelist for packages (PN)
-CVE_CHECK_PN_WHITELIST = "\
-    glibc-locale \
-"
+CVE_CHECK_PN_WHITELIST ?= ""
 
-# Whitelist for CVE and version of package
-CVE_CHECK_CVE_WHITELIST = "{\
-    'CVE-2014-2524': ('6.3','5.2',), \
-}"
+# Whitelist for CVE. If a CVE is found, then it is considered patched.
+# The value is a string containing space separated CVE values:
+# 
+# CVE_CHECK_WHITELIST = 'CVE-2014-2524 CVE-2018-1234'
+# 
+CVE_CHECK_WHITELIST ?= ""
 
 python do_cve_check () {
     """
     Check recipe for patched and unpatched CVEs
     """
 
-    if os.path.exists(d.getVar("CVE_CHECK_TMP_FILE")):
+    if os.path.exists(d.getVar("CVE_CHECK_DB_FILE")):
         patched_cves = get_patches_cves(d)
         patched, unpatched = check_cves(d, patched_cves)
         if patched or unpatched:
             cve_data = get_cve_info(d, patched + unpatched)
             cve_write_data(d, patched, unpatched, cve_data)
     else:
-        bb.note("Failed to update CVE database, skipping CVE check")
+        bb.note("No CVE database found, skipping CVE check")
+
 }
 
-addtask cve_check after do_unpack before do_build
-do_cve_check[depends] = "cve-check-tool-native:do_populate_sysroot cve-check-tool-native:do_populate_cve_db"
+addtask cve_check before do_build
+do_cve_check[depends] = "cve-update-db-native:do_populate_cve_db"
 do_cve_check[nostamp] = "1"
 
 python cve_check_cleanup () {
     """
     Delete the file used to gather all the CVE information.
     """
-
     bb.utils.remove(e.data.getVar("CVE_CHECK_TMP_FILE"))
 }
 
@@ -163,89 +163,121 @@ def get_patches_cves(d):
 
 def check_cves(d, patched_cves):
     """
-    Run cve-check-tool looking for patched and unpatched CVEs.
+    Connect to the NVD database and find unpatched cves.
     """
+    from distutils.version import LooseVersion
 
-    import ast, csv, tempfile, subprocess, io
-
-    cves_patched = []
     cves_unpatched = []
-    bpn = d.getVar("CVE_PRODUCT")
+    # CVE_PRODUCT can contain more than one product (eg. curl/libcurl)
+    products = d.getVar("CVE_PRODUCT").split()
     # If this has been unset then we're not scanning for CVEs here (for example, image recipes)
-    if not bpn:
+    if not products:
         return ([], [])
     pv = d.getVar("CVE_VERSION").split("+git")[0]
-    cves = " ".join(patched_cves)
-    cve_db_dir = d.getVar("CVE_CHECK_DB_DIR")
-    cve_whitelist = ast.literal_eval(d.getVar("CVE_CHECK_CVE_WHITELIST"))
-    cve_cmd = "cve-check-tool"
-    cmd = [cve_cmd, "--no-html", "--skip-update", "--csv", "--not-affected", "-t", "faux", "-d", cve_db_dir]
 
     # If the recipe has been whitlisted we return empty lists
     if d.getVar("PN") in d.getVar("CVE_CHECK_PN_WHITELIST").split():
         bb.note("Recipe has been whitelisted, skipping check")
         return ([], [])
 
-    try:
-        # Write the faux CSV file to be used with cve-check-tool
-        fd, faux = tempfile.mkstemp(prefix="cve-faux-")
-        with os.fdopen(fd, "w") as f:
-            for pn in bpn.split():
-                f.write("%s,%s,%s,\n" % (pn, pv, cves))
-        cmd.append(faux)
-
-        output = subprocess.check_output(cmd).decode("utf-8")
-        bb.debug(2, "Output of command %s:\n%s" % ("\n".join(cmd), output))
-    except subprocess.CalledProcessError as e:
-        bb.warn("Couldn't check for CVEs: %s (output %s)" % (e, e.output))
-    finally:
-        os.remove(faux)
-
-    for row in csv.reader(io.StringIO(output)):
-        # Third row has the unpatched CVEs
-        if row[2]:
-            for cve in row[2].split():
-                # Skip if the CVE has been whitlisted for the current version
-                if pv in cve_whitelist.get(cve,[]):
-                    bb.note("%s-%s has been whitelisted for %s" % (bpn, pv, cve))
+    old_cve_whitelist =  d.getVar("CVE_CHECK_CVE_WHITELIST")
+    if old_cve_whitelist:
+        bb.warn("CVE_CHECK_CVE_WHITELIST is deprecated, please use CVE_CHECK_WHITELIST.")
+    cve_whitelist = d.getVar("CVE_CHECK_WHITELIST").split()
+
+    import sqlite3
+    db_file = d.expand("file:${CVE_CHECK_DB_FILE}?mode=ro")
+    conn = sqlite3.connect(db_file, uri=True)
+
+    # For each of the known product names (e.g. curl has CPEs using curl and libcurl)...
+    for product in products:
+        if ":" in product:
+            vendor, product = product.split(":", 1)
+        else:
+            vendor = "%"
+
+        # Find all relevant CVE IDs.
+        for cverow in conn.execute("SELECT DISTINCT ID FROM PRODUCTS WHERE PRODUCT IS ? AND VENDOR LIKE ?", (product, vendor)):
+            cve = cverow[0]
+
+            if cve in cve_whitelist:
+                bb.note("%s-%s has been whitelisted for %s" % (product, pv, cve))
+                # TODO: this should be in the report as 'whitelisted'
+                patched_cves.add(cve)
+                continue
+            elif cve in patched_cves:
+                bb.note("%s has been patched" % (cve))
+                continue
+
+            vulnerable = False
+            for row in conn.execute("SELECT * FROM PRODUCTS WHERE ID IS ? AND PRODUCT IS ? AND VENDOR LIKE ?", (cve, product, vendor)):
+                (_, _, _, version_start, operator_start, version_end, operator_end) = row
+                #bb.debug(2, "Evaluating row " + str(row))
+
+                if (operator_start == '=' and pv == version_start):
+                    vulnerable = True
                 else:
+                    if operator_start:
+                        try:
+                            vulnerable_start =  (operator_start == '>=' and LooseVersion(pv) >= LooseVersion(version_start))
+                            vulnerable_start |= (operator_start == '>' and LooseVersion(pv) > LooseVersion(version_start))
+                        except:
+                            bb.warn("%s: Failed to compare %s %s %s for %s" %
+                                    (product, pv, operator_start, version_start, cve))
+                            vulnerable_start = False
+                    else:
+                        vulnerable_start = False
+
+                    if operator_end:
+                        try:
+                            vulnerable_end  = (operator_end == '<=' and LooseVersion(pv) <= LooseVersion(version_end))
+                            vulnerable_end |= (operator_end == '<' and LooseVersion(pv) < LooseVersion(version_end))
+                        except:
+                            bb.warn("%s: Failed to compare %s %s %s for %s" %
+                                    (product, pv, operator_end, version_end, cve))
+                            vulnerable_end = False
+                    else:
+                        vulnerable_end = False
+
+                    if operator_start and operator_end:
+                        vulnerable = vulnerable_start and vulnerable_end
+                    else:
+                        vulnerable = vulnerable_start or vulnerable_end
+
+                if vulnerable:
+                    bb.note("%s-%s is vulnerable to %s" % (product, pv, cve))
                     cves_unpatched.append(cve)
-                    bb.debug(2, "%s-%s is not patched for %s" % (bpn, pv, cve))
-        # Fourth row has patched CVEs
-        if row[3]:
-            for cve in row[3].split():
-                cves_patched.append(cve)
-                bb.debug(2, "%s-%s is patched for %s" % (bpn, pv, cve))
+                    break
+
+            if not vulnerable:
+                bb.note("%s-%s is not vulnerable to %s" % (product, pv, cve))
+                # TODO: not patched but not vulnerable
+                patched_cves.add(cve)
+
+    conn.close()
 
-    return (cves_patched, cves_unpatched)
+    return (list(patched_cves), cves_unpatched)
 
 def get_cve_info(d, cves):
     """
-    Get CVE information from the database used by cve-check-tool.
-
-    Unfortunately the only way to get CVE info is set the output to
-    html (hard to parse) or query directly the database.
+    Get CVE information from the database.
     """
 
-    try:
-        import sqlite3
-    except ImportError:
-        from pysqlite2 import dbapi2 as sqlite3
+    import sqlite3
 
     cve_data = {}
-    db_file = d.getVar("CVE_CHECK_DB_FILE")
-    placeholder = ",".join("?" * len(cves))
-    query = "SELECT * FROM NVD WHERE id IN (%s)" % placeholder
-    conn = sqlite3.connect(db_file)
-    cur = conn.cursor()
-    for row in cur.execute(query, tuple(cves)):
-        cve_data[row[0]] = {}
-        cve_data[row[0]]["summary"] = row[1]
-        cve_data[row[0]]["score"] = row[2]
-        cve_data[row[0]]["modified"] = row[3]
-        cve_data[row[0]]["vector"] = row[4]
-    conn.close()
+    conn = sqlite3.connect(d.getVar("CVE_CHECK_DB_FILE"))
 
+    for cve in cves:
+        for row in conn.execute("SELECT * FROM NVD WHERE ID IS ?", (cve,)):
+            cve_data[row[0]] = {}
+            cve_data[row[0]]["summary"] = row[1]
+            cve_data[row[0]]["scorev2"] = row[2]
+            cve_data[row[0]]["scorev3"] = row[3]
+            cve_data[row[0]]["modified"] = row[4]
+            cve_data[row[0]]["vector"] = row[5]
+
+    conn.close()
     return cve_data
 
 def cve_write_data(d, patched, unpatched, cve_data):
@@ -270,7 +302,8 @@ def cve_write_data(d, patched, unpatched, cve_data):
             unpatched_cves.append(cve)
             write_string += "CVE STATUS: Unpatched\n"
         write_string += "CVE SUMMARY: %s\n" % cve_data[cve]["summary"]
-        write_string += "CVSS v2 BASE SCORE: %s\n" % cve_data[cve]["score"]
+        write_string += "CVSS v2 BASE SCORE: %s\n" % cve_data[cve]["scorev2"]
+        write_string += "CVSS v3 BASE SCORE: %s\n" % cve_data[cve]["scorev3"]
         write_string += "VECTOR: %s\n" % cve_data[cve]["vector"]
         write_string += "MORE INFORMATION: %s%s\n\n" % (nvd_link, cve)