Add postgresql advisories importer

Signed-off-by: Shivam Sandbhor <shivam.sandbhor@gmail.com>

Author: sbs2001

vulnerabilities/importer_yielder.py

@@ -200,6 +200,13 @@
             'etag': {}
         },
     },
+    {
+        'name': 'postgresql',
+        'license': '',
+        'last_run': None,
+        'data_source': 'PostgreSQLDataSource',
+        'data_source_cfg': {},
+    },
 
 ]
 

vulnerabilities/importers/__init__.py

@@ -40,3 +40,4 @@
 from vulnerabilities.importers.nvd import NVDDataSource
 from vulnerabilities.importers.project_kb_msr2019 import ProjectKBMSRDataSource
 from vulnerabilities.importers.nginx import NginxDataSource
+from vulnerabilities.importers.postgresql import PostgreSQLDataSource

vulnerabilities/importers/postgresql.py

@@ -0,0 +1,121 @@
+# Copyright (c) nexB Inc. and others. All rights reserved.
+# http://nexb.com and https://github.com/nexB/vulnerablecode/
+# The VulnerableCode software is licensed under the Apache License version 2.0.
+# Data generated with VulnerableCode require an acknowledgment.
+#
+# You may not use this software except in compliance with the License.
+# You may obtain a copy of the License at: http://apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software distributed
+# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+# CONDITIONS OF ANY KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations under the License.
+#
+# When you publish or redistribute any data created with VulnerableCode or any VulnerableCode
+# derivative work, you must accompany this data with the following acknowledgment:
+#
+#  Generated with VulnerableCode and provided on an "AS IS" BASIS, WITHOUT WARRANTIES
+#  OR CONDITIONS OF ANY KIND, either express or implied. No content created from
+#  VulnerableCode should be considered or used as legal advice. Consult an Attorney
+#  for any legal advice.
+#  VulnerableCode is a free software from nexB Inc. and others.
+#  Visit https://github.com/nexB/vulnerablecode/ for support and download.
+
+import dataclasses
+
+from bs4 import BeautifulSoup
+from packageurl import PackageURL
+import requests
+from urllib.parse import urljoin
+
+from vulnerabilities.data_source import Advisory
+from vulnerabilities.data_source import DataSource
+from vulnerabilities.data_source import Reference
+
+BASE_URL = "https://www.postgresql.org/"
+
+
+class PostgreSQLDataSource(DataSource):
+
+    root_url = "https://www.postgresql.org/support/security/"
+
+    def updated_advisories(self):
+        advisories = []
+        known_urls = {self.root_url}
+        visited_urls = set()
+        while True:
+            unvisited_urls = known_urls - visited_urls
+            for url in unvisited_urls:
+                data = requests.get(url).content
+                advisories.extend(to_advisories(data))
+                visited_urls.add(url)
+                known_urls.update(find_advisory_urls(data))
+
+            if known_urls == visited_urls:
+                break
+
+        return self.batch_advisories(advisories)
+
+
+def to_advisories(data):
+    advisories = []
+    soup = BeautifulSoup(data)
+    table = soup.select("table")[0]
+    for row in table.select("tbody tr"):
+        ref_col, affected_col, fixed_col, severity_score_col, desc_col = row.select("td")
+        summary = desc_col.text
+        pkg_qualifiers = {}
+        if "windows" in summary.lower():
+            pkg_qualifiers = {"os": "windows"}
+
+        affected_packages = [
+            PackageURL(
+                type="generic",
+                name="postgresql",
+                version=version.strip(),
+                qualifiers=pkg_qualifiers,
+            )
+            for version in affected_col.text.split(",")
+        ]
+
+        fixed_packages = [
+            PackageURL(
+                type="generic",
+                name="postgresql",
+                version=version.strip(),
+                qualifiers=pkg_qualifiers,
+            )
+            for version in fixed_col.text.split(",")
+        ]
+
+        try:
+            cve_id = ref_col.select("nobr")[0].text
+            # This is for the anomaly in https://www.postgresql.org/support/security/8.1/ 's
+            # last entry
+        except IndexError:
+            pass
+
+        references = []
+        for a_tag in ref_col.select("a"):
+            link = a_tag.attrs["href"]
+            if link.startswith("/about/news/"):
+                # Convert postgresql official announcements to absolute url.
+                link = urljoin(BASE_URL, link)
+
+            references.append(Reference(url=link))
+
+        advisories.append(
+            Advisory(
+                cve_id=cve_id,
+                summary=summary,
+                vuln_references=references,
+                impacted_package_urls=affected_packages,
+                resolved_package_urls=fixed_packages,
+            )
+        )
+
+    return advisories
+
+
+def find_advisory_urls(page_data):
+    soup = BeautifulSoup(page_data)
+    return {urljoin(BASE_URL, a_tag.attrs["href"]) for a_tag in soup.select("h3+ p a")}