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Diffstat (limited to 'meta/recipes-core/meta/cve-update-db-native.bb')
-rw-r--r-- | meta/recipes-core/meta/cve-update-db-native.bb | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/meta/recipes-core/meta/cve-update-db-native.bb b/meta/recipes-core/meta/cve-update-db-native.bb new file mode 100644 index 0000000000..e9a023e9bd --- /dev/null +++ b/meta/recipes-core/meta/cve-update-db-native.bb | |||
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1 | SUMMARY = "Updates the NVD CVE database" | ||
2 | LICENSE = "MIT" | ||
3 | |||
4 | INHIBIT_DEFAULT_DEPS = "1" | ||
5 | |||
6 | inherit native | ||
7 | |||
8 | deltask do_unpack | ||
9 | deltask do_patch | ||
10 | deltask do_configure | ||
11 | deltask do_compile | ||
12 | deltask do_install | ||
13 | deltask do_populate_sysroot | ||
14 | |||
15 | python () { | ||
16 | if not d.getVar("CVE_CHECK_DB_FILE"): | ||
17 | raise bb.parse.SkipRecipe("Skip recipe when cve-check class is not loaded.") | ||
18 | } | ||
19 | |||
20 | python do_populate_cve_db() { | ||
21 | """ | ||
22 | Update NVD database with json data feed | ||
23 | """ | ||
24 | import bb.utils | ||
25 | import sqlite3, urllib, urllib.parse, shutil, gzip | ||
26 | from datetime import date | ||
27 | |||
28 | bb.utils.export_proxies(d) | ||
29 | |||
30 | BASE_URL = "https://nvd.nist.gov/feeds/json/cve/1.0/nvdcve-1.0-" | ||
31 | YEAR_START = 2002 | ||
32 | |||
33 | db_file = d.getVar("CVE_CHECK_DB_FILE") | ||
34 | db_dir = os.path.dirname(db_file) | ||
35 | json_tmpfile = os.path.join(db_dir, 'nvd.json.gz') | ||
36 | |||
37 | # Don't refresh the database more than once an hour | ||
38 | try: | ||
39 | import time | ||
40 | if time.time() - os.path.getmtime(db_file) < (60*60): | ||
41 | return | ||
42 | except OSError: | ||
43 | pass | ||
44 | |||
45 | cve_f = open(os.path.join(d.getVar("TMPDIR"), 'cve_check'), 'a') | ||
46 | |||
47 | if not os.path.isdir(db_dir): | ||
48 | os.mkdir(db_dir) | ||
49 | |||
50 | # Connect to database | ||
51 | conn = sqlite3.connect(db_file) | ||
52 | c = conn.cursor() | ||
53 | |||
54 | initialize_db(c) | ||
55 | |||
56 | for year in range(YEAR_START, date.today().year + 1): | ||
57 | year_url = BASE_URL + str(year) | ||
58 | meta_url = year_url + ".meta" | ||
59 | json_url = year_url + ".json.gz" | ||
60 | |||
61 | # Retrieve meta last modified date | ||
62 | response = urllib.request.urlopen(meta_url) | ||
63 | if response: | ||
64 | for l in response.read().decode("utf-8").splitlines(): | ||
65 | key, value = l.split(":", 1) | ||
66 | if key == "lastModifiedDate": | ||
67 | last_modified = value | ||
68 | break | ||
69 | else: | ||
70 | bb.warn("Cannot parse CVE metadata, update failed") | ||
71 | return | ||
72 | |||
73 | # Compare with current db last modified date | ||
74 | c.execute("select DATE from META where YEAR = ?", (year,)) | ||
75 | meta = c.fetchone() | ||
76 | if not meta or meta[0] != last_modified: | ||
77 | # Clear products table entries corresponding to current year | ||
78 | c.execute("delete from PRODUCTS where ID like ?", ('CVE-%d%%' % year,)) | ||
79 | |||
80 | # Update db with current year json file | ||
81 | try: | ||
82 | response = urllib.request.urlopen(json_url) | ||
83 | if response: | ||
84 | update_db(c, gzip.decompress(response.read()).decode('utf-8')) | ||
85 | c.execute("insert or replace into META values (?, ?)", [year, last_modified]) | ||
86 | except urllib.error.URLError as e: | ||
87 | cve_f.write('Warning: CVE db update error, CVE data is outdated.\n\n') | ||
88 | bb.warn("Cannot parse CVE data (%s), update failed" % e.reason) | ||
89 | return | ||
90 | |||
91 | # Update success, set the date to cve_check file. | ||
92 | if year == date.today().year: | ||
93 | cve_f.write('CVE database update : %s\n\n' % date.today()) | ||
94 | |||
95 | cve_f.close() | ||
96 | conn.commit() | ||
97 | conn.close() | ||
98 | } | ||
99 | |||
100 | def initialize_db(c): | ||
101 | c.execute("CREATE TABLE IF NOT EXISTS META (YEAR INTEGER UNIQUE, DATE TEXT)") | ||
102 | |||
103 | c.execute("CREATE TABLE IF NOT EXISTS NVD (ID TEXT UNIQUE, SUMMARY TEXT, \ | ||
104 | SCOREV2 TEXT, SCOREV3 TEXT, MODIFIED INTEGER, VECTOR TEXT)") | ||
105 | |||
106 | c.execute("CREATE TABLE IF NOT EXISTS PRODUCTS (ID TEXT, \ | ||
107 | VENDOR TEXT, PRODUCT TEXT, VERSION_START TEXT, OPERATOR_START TEXT, \ | ||
108 | VERSION_END TEXT, OPERATOR_END TEXT)") | ||
109 | c.execute("CREATE INDEX IF NOT EXISTS PRODUCT_ID_IDX on PRODUCTS(ID);") | ||
110 | |||
111 | def parse_node_and_insert(c, node, cveId): | ||
112 | # Parse children node if needed | ||
113 | for child in node.get('children', ()): | ||
114 | parse_node_and_insert(c, child, cveId) | ||
115 | |||
116 | def cpe_generator(): | ||
117 | for cpe in node.get('cpe_match', ()): | ||
118 | if not cpe['vulnerable']: | ||
119 | return | ||
120 | cpe23 = cpe['cpe23Uri'].split(':') | ||
121 | vendor = cpe23[3] | ||
122 | product = cpe23[4] | ||
123 | version = cpe23[5] | ||
124 | |||
125 | if version != '*': | ||
126 | # Version is defined, this is a '=' match | ||
127 | yield [cveId, vendor, product, version, '=', '', ''] | ||
128 | else: | ||
129 | # Parse start version, end version and operators | ||
130 | op_start = '' | ||
131 | op_end = '' | ||
132 | v_start = '' | ||
133 | v_end = '' | ||
134 | |||
135 | if 'versionStartIncluding' in cpe: | ||
136 | op_start = '>=' | ||
137 | v_start = cpe['versionStartIncluding'] | ||
138 | |||
139 | if 'versionStartExcluding' in cpe: | ||
140 | op_start = '>' | ||
141 | v_start = cpe['versionStartExcluding'] | ||
142 | |||
143 | if 'versionEndIncluding' in cpe: | ||
144 | op_end = '<=' | ||
145 | v_end = cpe['versionEndIncluding'] | ||
146 | |||
147 | if 'versionEndExcluding' in cpe: | ||
148 | op_end = '<' | ||
149 | v_end = cpe['versionEndExcluding'] | ||
150 | |||
151 | yield [cveId, vendor, product, v_start, op_start, v_end, op_end] | ||
152 | |||
153 | c.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()) | ||
154 | |||
155 | def update_db(c, jsondata): | ||
156 | import json | ||
157 | root = json.loads(jsondata) | ||
158 | |||
159 | for elt in root['CVE_Items']: | ||
160 | if not elt['impact']: | ||
161 | continue | ||
162 | |||
163 | accessVector = None | ||
164 | cveId = elt['cve']['CVE_data_meta']['ID'] | ||
165 | cveDesc = elt['cve']['description']['description_data'][0]['value'] | ||
166 | date = elt['lastModifiedDate'] | ||
167 | try: | ||
168 | accessVector = elt['impact']['baseMetricV2']['cvssV2']['accessVector'] | ||
169 | cvssv2 = elt['impact']['baseMetricV2']['cvssV2']['baseScore'] | ||
170 | except KeyError: | ||
171 | cvssv2 = 0.0 | ||
172 | try: | ||
173 | accessVector = accessVector or elt['impact']['baseMetricV3']['cvssV3']['attackVector'] | ||
174 | cvssv3 = elt['impact']['baseMetricV3']['cvssV3']['baseScore'] | ||
175 | except KeyError: | ||
176 | accessVector = accessVector or "UNKNOWN" | ||
177 | cvssv3 = 0.0 | ||
178 | |||
179 | c.execute("insert or replace into NVD values (?, ?, ?, ?, ?, ?)", | ||
180 | [cveId, cveDesc, cvssv2, cvssv3, date, accessVector]) | ||
181 | |||
182 | configurations = elt['configurations']['nodes'] | ||
183 | for config in configurations: | ||
184 | parse_node_and_insert(c, config, cveId) | ||
185 | |||
186 | |||
187 | addtask do_populate_cve_db before do_fetch | ||
188 | do_populate_cve_db[nostamp] = "1" | ||
189 | |||
190 | EXCLUDE_FROM_WORLD = "1" | ||