Add GitHub API importer

.travis.yml

@@ -8,7 +8,9 @@ install:
   - pip install -r requirements.txt
 
 env:
+  global:
   - SECRET_KEY="i1bn=oly)w*2yl-5yc&f!vvgt)p)fh3_2$r#spa!*sw36f5ov7"
+  - GH_TOKEN="dummygithubtoken"
 
 before_script:
   - pycodestyle --exclude=migrations,settings.py,venv,lib_oval.py,test_ubuntu.py,test_suse.py,test_data_source.py --max-line-length=100 .

vulnerabilities/importer_yielder.py

@@ -157,6 +157,17 @@
             'etags': {},
             'db_url': 'https://usn.ubuntu.com/usn-db/database-all.json.bz2'
         },
+    },
+
+    {
+        'name': 'github',
+        'license': '',
+        'last_run': None,
+        'data_source': 'GitHubAPIDataSource',
+        'data_source_cfg': {
+            'endpoint': 'https://api.github.com/graphql',
+            'ecosystems': ['MAVEN', 'NUGET', 'COMPOSER']
+        }
     }
 
 ]

vulnerabilities/importers/__init__.py

@@ -36,3 +36,4 @@
 from vulnerabilities.importers.gentoo import GentooDataSource
 from vulnerabilities.importers.openssl import OpenSSLDataSource
 from vulnerabilities.importers.ubuntu_usn import UbuntuUSNDataSource
+from vulnerabilities.importers.github import GitHubAPIDataSource

vulnerabilities/importers/github.py

@@ -0,0 +1,318 @@
+# 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 code scanning tool from nexB Inc. and others.
+#  Visit https://github.com/nexB/vulnerablecode/ for support and download.
+
+
+import os
+import dataclasses
+import json
+from typing import Set
+from typing import Tuple
+from typing import List
+from typing import Mapping
+from typing import Optional
+import xml.etree.ElementTree as ET
+
+import requests
+from dephell_specifier import RangeSpecifier
+from packageurl import PackageURL
+
+from vulnerabilities.data_source import Advisory
+from vulnerabilities.data_source import DataSource
+from vulnerabilities.data_source import DataSourceConfiguration
+
+
+# set of all possible values of first '%s' = {'MAVEN','COMPOSER', 'NUGET'}
+# second '%s' is interesting, it will have the value '' for the first request,
+# since we don't have any value for endCursor at the beginning
+# for all the subsequent requests it will have value 'after: "{endCursor}""
+query = """
+        query{
+        securityVulnerabilities(first: 100, ecosystem: %s, %s) {
+            edges {
+            node {
+                advisory {
+                identifiers {
+                    type
+                    value
+                }
+                summary
+                }
+                package {
+                name
+                }
+                vulnerableVersionRange
+            }
+            }
+            pageInfo {
+            hasNextPage
+            endCursor
+            }
+        }
+        }
+        """
+
+
+class GitHubTokenError(Exception):
+    pass
+
+
+@dataclasses.dataclass
+class GitHubAPIDataSourceConfiguration(DataSourceConfiguration):
+    endpoint: str
+    ecosystems: list
+
+
+class GitHubAPIDataSource(DataSource):
+
+    CONFIG_CLASS = GitHubAPIDataSourceConfiguration
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        try:
+            self.gh_token = os.environ["GH_TOKEN"]
+        except KeyError:
+            raise GitHubTokenError("Environment variable GH_TOKEN is missing")
+
+    def __enter__(self):
+        self.advisories = self.fetch()
+
+    def updated_advisories(self) -> Set[Advisory]:
+        return self.batch_advisories(self.process_response())
+
+    def fetch(self) -> Mapping[str, List[Mapping]]:
+        headers = {"Authorization": "token " + self.gh_token}
+        api_data = {}
+        for ecosystem in self.config.ecosystems:
+
+            api_data[ecosystem] = []
+            end_cursor_exp = ""
+
+            while True:
+
+                query_json = {"query": query % (ecosystem, end_cursor_exp)}
+                resp = requests.post(self.config.endpoint, headers=headers, json=query_json).json()
+                print(resp)
+                if resp.get("message") == "Bad credentials":
+                    raise GitHubTokenError("Invalid GitHub token")
+
+                end_cursor = resp["data"]["securityVulnerabilities"]["pageInfo"]["endCursor"]
+                end_cursor_exp = "after: {}".format('"{}"'.format(end_cursor))
+                api_data[ecosystem].append(resp)
+
+                if not resp["data"]["securityVulnerabilities"]["pageInfo"]["hasNextPage"]:
+                    break
+        return api_data
+
+    def set_version_api(self, ecosystem: str) -> None:
+        versioners = {
+            "MAVEN": MavenVersionAPI,
+            "NUGET": NugetVersionAPI,
+            "COMPOSER": ComposerVersionAPI,
+        }
+        versioner = versioners.get(ecosystem)
+        if versioner:
+            self.version_api = versioner()
+
+    @staticmethod
+    def process_name(ecosystem: str, pkg_name: str) -> Optional[Tuple[Optional[str], str]]:
+        if ecosystem == "MAVEN":
+            artifact_comps = pkg_name.split(":")
+            if len(artifact_comps) != 2:
+                return
+            ns, name = artifact_comps
+            return ns, name
+
+        if ecosystem == "NUGET":
+            return None, pkg_name
+
+        if ecosystem == "COMPOSER":
+            vendor, name = pkg_name.split("/")
+            return vendor, name
+
+    def process_response(self) -> List[Advisory]:
+        adv_list = []
+        for ecosystem in self.advisories:
+            self.set_version_api(ecosystem)
+            pkg_type = ecosystem.lower()
+            for resp_page in self.advisories[ecosystem]:
+                for adv in resp_page["data"]["securityVulnerabilities"]["edges"]:
+                    name = adv["node"]["package"]["name"]
+
+                    if self.process_name(ecosystem, name):
+                        ns, pkg_name = self.process_name(ecosystem, name)
+                    else:
+                        continue
+                    aff_range = adv["node"]["vulnerableVersionRange"]
+                    self.version_api.load_to_api(name)
+                    aff_vers, unaff_vers = self.categorize_versions(
+                        aff_range, self.version_api.get(name)
+                    )
+
+                    affected_purls = {
+                        PackageURL(name=pkg_name, namespace=ns, version=version, type=pkg_type)
+                        for version in aff_vers
+                    }
+
+                    unaffected_purls = {
+                        PackageURL(name=pkg_name, namespace=ns, version=version, type=pkg_type)
+                        for version in unaff_vers
+                    }
+
+                    cve_ids = set()
+                    ref_ids = set()
+                    vuln_desc = adv["node"]["advisory"]["summary"]
+
+                    for vuln in adv["node"]["advisory"]["identifiers"]:
+                        if vuln["type"] == "CVE":
+                            cve_ids.add(vuln["value"])
+                        else:
+                            ref_ids.add(vuln["value"])
+                    for cve_id in cve_ids:
+                        adv_list.append(
+                            Advisory(
+                                cve_id=cve_id,
+                                summary=vuln_desc,
+                                impacted_package_urls=affected_purls,
+                                resolved_package_urls=unaffected_purls,
+                                reference_ids=ref_ids,
+                            )
+                        )
+        return adv_list
+
+    @staticmethod
+    def categorize_versions(version_range: str, all_versions: Set[str]) -> Tuple[Set[str], Set[str]]:  # nopep8
+        version_range = RangeSpecifier(version_range)
+        affected_versions = {version for version in all_versions if version in version_range}
+        return (affected_versions, all_versions - affected_versions)
+
+
+class MavenVersionAPI:
+    def __init__(self):
+        self.cache = {}
+
+    def get(self, pkg_name: str) -> Set[str]:
+        return self.cache.get(pkg_name, set())
+
+    def load_to_api(self, pkg_name: str) -> None:
+        if pkg_name in self.cache:
+            return
+
+        artifact_comps = pkg_name.split(":")
+        endpoint = self.artifact_url(artifact_comps)
+        resp = requests.get(endpoint).content
+
+        try:
+            xml_resp = ET.ElementTree(ET.fromstring(resp.decode("utf-8")))
+            self.cache[pkg_name] = self.extract_versions(xml_resp)
+        except ET.ParseError:
+            self.cache[pkg_name] = set()
+
+    @staticmethod
+    def artifact_url(artifact_comps: List[str]) -> str:
+        base_url = "https://repo.maven.apache.org/maven2/{}"
+        group_id, artifact_id = artifact_comps
+        group_url = group_id.replace(".", "/")
+        suffix = group_url + "/" + artifact_id + "/" + "maven-metadata.xml"
+        endpoint = base_url.format(suffix)
+
+        return endpoint
+
+    @staticmethod
+    def extract_versions(xml_response: ET.ElementTree) -> Set[str]:
+        all_versions = set()
+        for child in xml_response.getroot().iter():
+            if child.tag == "version":
+                all_versions.add(child.text)
+
+        return all_versions
+
+
+class NugetVersionAPI:
+    def __init__(self):
+        self.cache = {}
+
+    def get(self, pkg_name: str) -> Set[str]:
+        return self.cache.get(pkg_name.lower(), set())
+
+    def load_to_api(self, pkg_name: str) -> None:
+        if pkg_name in self.cache:
+            return
+        endpoint = self.nuget_url(pkg_name)
+        try:
+            resp = requests.get(endpoint).json()
+        # pkg_name=Microsoft.NETCore.UniversalWindowsPlatform triggers
+        # JSONDecodeError.
+        except json.decoder.JSONDecodeError:
+            self.cache[pkg_name.lower()] = set()
+            return
+
+        self.cache[pkg_name.lower()] = self.extract_versions(resp)
+
+    @staticmethod
+    def nuget_url(pkg_name: str) -> str:
+        base_url = "https://api.nuget.org/v3/registration5-semver1/{}/index.json"
+        return base_url.format(pkg_name.lower())
+
+    @staticmethod
+    def extract_versions(resp: dict) -> Set[str]:
+        all_versions = set()
+
+        try:
+            for entry in resp["items"][0]["items"]:
+                all_versions.add(entry["catalogEntry"]["version"])
+        # json response for YamlDotNet.Signed triggers this exception
+        except KeyError:
+            pass
+
+        return all_versions
+
+
+class ComposerVersionAPI:
+    def __init__(self):
+        self.cache = {}
+
+    def get(self, pkg_name: str) -> Set[str]:
+        return self.cache.get(pkg_name.lower(), set())
+
+    def load_to_api(self, pkg_name: str) -> None:
+        if pkg_name in self.cache:
+            return
+
+        endpoint = self.composer_url(pkg_name)
+        json_resp = requests.get(endpoint).json()
+        self.cache[pkg_name] = self.extract_versions(json_resp, pkg_name)
+
+    @staticmethod
+    def composer_url(pkg_name: str) -> str:
+        vendor, name = pkg_name.split("/")
+        return f"https://repo.packagist.org/p/{vendor}/{name}.json"
+
+    @staticmethod
+    def extract_versions(resp: dict, pkg_name: str) -> Set[str]:
+        all_versions = resp["packages"][pkg_name].keys()
+        # This filter ensures, that all_versions contains only released versions
+        all_versions = set(filter(lambda x: "dev" not in x, all_versions))
+        # See https://github.com/composer/composer/blob/44a4429978d1b3c6223277b875762b2930e83e8c/doc/articles/versions.md#tags  # nopep8
+        # for explanation of removing 'v'
+        all_versions = set(map(lambda x: x.replace("v", ""), all_versions))
+
+        return all_versions