Merge pull request #7 from cedricbonhomme/master

Enable this nice tool to be used as a Python library

.github/workflows/pythonapp.yml

@@ -0,0 +1,35 @@
+name: Python application
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry install
+
+    - name: Lint with flake8
+      run: |
+        pip install flake8
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+
+    - name: Test with pytest
+      run: |
+        poetry run pytest
+      env:
+        testing: actions

.gitignore

@@ -0,0 +1,39 @@
+# use glob syntax
+syntax: glob
+
+*.elc
+*.pyc
+*~
+*.db
+
+# Virtualenv
+venv
+build
+
+# setuptools
+build/*
+git_vuln_finder.egg-info/
+dist/*
+
+# tests
+.coverage
+.mypy_cache/
+.cache/
+test_repos/
+
+# sphinx
+docs/_build
+
+# Emacs
+eproject.cfg
+
+# Temporary files (vim backups)
+*.swp
+
+.idea/
+
+# Log files:
+*.log
+
+# Vagrant:
+.vagrant/

README.md

@@ -2,18 +2,93 @@
 
 ![git-vuln-finder logo](https://raw.githubusercontent.com/cve-search/git-vuln-finder/f22077452c37e110bff0564e1f7b34637dc726c3/doc/logos/git-vuln-finder-small.png)
 
-Finding potential software vulnerabilities from git commit messages. The output format is a JSON with the associated commit which could contain a fix regarding a software vulnerability. The search is based on a set of regular expressions against the commit messages only. If CVE IDs are present, those are added automatically in the output.
+[![Workflow](https://github.com/cedricbonhomme/git-vuln-finder/workflows/Python%20application/badge.svg?style=flat-square)](https://github.com/cedricbonhomme/git-vuln-finder/actions?query=workflow%3A%22Python+application%22)
+
+Finding potential software vulnerabilities from git commit messages.
+The output format is a JSON with the associated commit which could contain a
+fix regarding a software vulnerability. The search is based on a set of regular
+expressions against the commit messages only. If CVE IDs are present, those are
+added automatically in the output.
 
 # Requirements
 
-- Python 3.6
-- GitPython
-- langdetect
+- jq (``sudo apt install jq``)
 
-# Usage
+
+# Installation
+
+## Use it as a library
 
 ~~~bash
-usage: finder.py [-h] [-v] [-r R] [-o O] [-s S] [-p P] [-c] [-t]
+$ poetry install git-vuln-finder
+$ poetry shell
+~~~
+
+You can also use ``pip``. Then just import it:
+
+~~~python
+Python 3.8.0 (default, Dec 11 2019, 21:43:13)
+[GCC 9.2.1 20191008] on linux
+Type "help", "copyright", "credits" or "license" for more information.
+>>> from git_vuln_finder import find
+>>> all_potential_vulnerabilities, all_cve_found, found = find("~/git/curl")
+
+>>> [commit for commit, summary in all_potential_vulnerabilities.items() if summary['state'] == 'cve-assigned']
+['9069838b30fb3b48af0123e39f664cea683254a5', 'facb0e4662415b5f28163e853dc6742ac5fafb3d',
+... snap ...
+ '8a75dbeb2305297640453029b7905ef51b87e8dd', '1dc43de0dccc2ea7da6dddb7b98f8d7dcf323914', '192c4f788d48f82c03e9cef40013f34370e90737', '2eb8dcf26cb37f09cffe26909a646e702dbcab66', 'fa1ae0abcde5df8d0b3283299e3f246bedf7692c', 'c11c30a8c8d727dcf5634fa0cc6ee0b4b77ddc3d', '75ca568fa1c19de4c5358fed246686de8467c238', 'a20daf90e358c1476a325ea665d533f7a27e3364', '042cc1f69ec0878f542667cb684378869f859911']
+
+ >>> print(json.dumps(all_potential_vulnerabilities['9069838b30fb3b48af0123e39f664cea683254a5'], sort_keys=True, indent=4, separators=(",", ": ")))
+ {
+     "author": "Daniel Stenberg",
+     "author-email": "daniel@haxx.se",
+     "authored_date": 1567544372,
+     "branches": [
+         "master"
+     ],
+     "commit-id": "9069838b30fb3b48af0123e39f664cea683254a5",
+     "committed_date": 1568009674,
+     "cve": [
+         "CVE-2019-5481",
+         "CVE-2019-5481"
+     ],
+     "language": "en",
+     "message": "security:read_data fix bad realloc()\n\n... that could end up a double-free\n\nCVE-2019-5481\nBug: https://curl.haxx.se/docs/CVE-2019-5481.html\n",
+     "origin": "https://github.com/curl/curl.git",
+     "origin-github-api": "https://api.github.com/repos///github.com/curl/curl/commits/9069838b30fb3b48af0123e39f664cea683254a5",
+     "pattern-matches": [
+         "double-free"
+     ],
+     "pattern-selected": "(?i)(double[-| ]free|buffer overflow|double free|race[-| ]condition)",
+     "state": "cve-assigned",
+     "stats": {
+         "deletions": 4,
+         "files": 1,
+         "insertions": 2,
+         "lines": 6
+     },
+     "summary": "security:read_data fix bad realloc()",
+     "tags": []
+ }
+~~~
+
+
+## Use it as a command line tool
+
+~~~bash
+$ pipx install git-vuln-finder
+$ git-vuln-finder --help
+~~~
+
+You can also use pip.
+``pipx`` installs scripts (system wide available) provided by Python packages
+into separate virtualenvs to shield them from your system and each other.
+
+
+### Usage
+
+~~~bash
+usage: git-vuln-finder [-h] [-v] [-r R] [-o O] [-s S] [-p P] [-c] [-t]
 
 Finding potential software vulnerabilities from git commit messages.
 
@@ -33,6 +108,7 @@ optional arguments:
 More info: https://github.com/cve-search/git-vuln-finder
 ~~~
 
+
 # Patterns
 
 git-vuln-finder comes with 3 default patterns which can be selected to find the potential vulnerabilities described in the commit messages such as:
@@ -41,10 +117,11 @@ git-vuln-finder comes with 3 default patterns which can be selected to find the
 - [`cryptopatterns`](https://github.com/cve-search/git-vuln-finder/blob/master/patterns/en/medium/crypto) is a vulnerability pattern for cryptographic errors mentioned in commit messages.
 - [`cpatterns`](https://github.com/cve-search/git-vuln-finder/blob/master/patterns/en/medium/c) is a set of standard vulnerability patterns see for C/C++-like languages.
 
+
 ## A sample partial output from Curl git repository
 
 ~~~bash
-python3 finder.py -r /home/adulau/git/curl | jq .
+$ git-vuln-finder -r ~/git/curl | jq .
 ...
  "6df916d751e72fc9a1febc07bb59c4ddd886c043": {
     "message": "loadlibrary: Only load system DLLs from the system directory\n\nInspiration provided by: Daniel Stenberg and Ray Satiro\n\nBug: https://curl.haxx.se/docs/adv_20160530.html\n\nRef: Windows DLL hijacking with curl, CVE-2016-4802\n",
@@ -145,26 +222,35 @@ ploit|malicious|directory traversal |\bRCE\b|\bdos\b|\bXSRF \b|\bXSS\b|clickjack
   }
 ~~~
 
+
+# Running the tests
+
+~~~bash
+$ pytest
+~~~
+
+
 # License and author(s)
 
 This software is free software and licensed under the AGPL version 3.
 
-Copyright (c) 2019 Alexandre Dulaunoy - https://github.com/adulau/
+Copyright (c) 2019-2020 Alexandre Dulaunoy - https://github.com/adulau/
+
 
 # Acknowledgment
 
 - Thanks to [Jean-Louis Huynen](https://github.com/gallypette) for the discussions about the crypto vulnerability patterns.
 - Thanks to [Sebastien Tricaud](https://github.com/stricaud) for the discussions regarding native language, commit messages and external patterns.
 
+
 # Contributing
 
 We welcome contributions for the software and especially additional vulnerability patterns. Every contributors will be added in the [AUTHORS file](./AUTHORS) and
 collectively own this open source software. The contributors acknowledge the [Developer Certificate of Origin](https://developercertificate.org/).
 
+
 # References
 
 - [Notes](https://gist.github.com/adulau/dce5a6ca5c65017869bb01dfee576303#file-finding-vuln-git-commit-messages-md)
 - https://csce.ucmss.com/cr/books/2017/LFS/CSREA2017/ICA2077.pdf (mainly using CVE referenced in the commit message) - archive (http://archive.is/xep9o)
 - https://asankhaya.github.io/pdf/automated-identification-of-security-issues-from-commit-messages-and-bug-reports.pdf (2 main regexps)
-
-

REQUIREMENTS

@@ -1,2 +0,0 @@
-gitpython
-langdetect

bin/finder.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
 # Finding potential software vulnerabilities from git commit messages
@@ -7,217 +7,75 @@
 #
 # This software is part of cve-search.org
 #
-# Copyright (c) 2019 Alexandre Dulaunoy - a@foo.be
+# Copyright (c) 2019-2020 Alexandre Dulaunoy - a@foo.be
 
 
-import os
-import re
-import git
 import json
 import sys
 import argparse
-import typing
-from langdetect import detect as langdetect
 
-PATTERNS_PATH="../patterns"
-
-parser = argparse.ArgumentParser(description = "Finding potential software vulnerabilities from git commit messages.", epilog = "More info: https://github.com/cve-search/git-vuln-finder")
-parser.add_argument("-v", help="increase output verbosity", action="store_true")
-parser.add_argument("-r", type=str, help="git repository to analyse")
-parser.add_argument("-o", type=str, help="Output format: [json]", default="json")
-parser.add_argument("-s", type=str, help="State of the commit found", default="under-review")
-parser.add_argument("-p", type=str, help="Matching pattern to use: [vulnpatterns, cryptopatterns, cpatterns] - the pattern 'all' is used to match all the patterns at once.", default="vulnpatterns")
-parser.add_argument("-c", help="output only a list of the CVE pattern found in commit messages (disable by default)", action="store_true")
-parser.add_argument("-t", help="Include tags matching a specific commit", action="store_true")
-args = parser.parse_args()
+from git_vuln_finder import find, find_vuln, summary
 
 
-def build_pattern(pattern_file):
-    fp = open(pattern_file, "r")
-    rex = ""
-    try:
-        prefix_fp = open(pattern_file + ".prefix", "r")
-        rex += prefix_fp.read()
-        prefix_fp.close()
-    except:
-        pass
+def main():
+    """Point of entry for the script.
+    """
+    # Parsing arguments
+    parser = argparse.ArgumentParser(
+        description="Finding potential software vulnerabilities from git commit messages.",
+        epilog="More info: https://github.com/cve-search/git-vuln-finder",
+    )
+    parser.add_argument("-v", help="increase output verbosity", action="store_true")
+    parser.add_argument("-r", type=str, help="git repository to analyse")
+    parser.add_argument("-o", type=str, help="Output format: [json]", default="json")
+    parser.add_argument(
+        "-s", type=str, help="State of the commit found", default="under-review"
+    )
+    parser.add_argument(
+        "-p",
+        type=str,
+        help="Matching pattern to use: [vulnpatterns, cryptopatterns, cpatterns] - the pattern 'all' is used to match all the patterns at once.",
+        default="vulnpatterns",
+    )
+    parser.add_argument(
+        "-c",
+        help="output only a list of the CVE pattern found in commit messages (disable by default)",
+        action="store_true",
+    )
+    parser.add_argument(
+        "-t", help="Include tags matching a specific commit", action="store_true"
+    )
+    args = parser.parse_args()
 
-    for line in fp.readlines():
-        rex += line.rstrip() + "|"
-    rex = rex[:-1] # We remove the extra '|
-    fp.close()
+    if args.p not in ["vulnpatterns", "cryptopatterns", "cpatterns", "all"]:
+        parser.print_usage()
+        parser.exit()
 
-    try:
-        suffix_fp = open(pattern_file + ".suffix", "r")
-        rex += suffix_fp.read()
-        suffix_fp.close()
-    except:
-        pass
+    if not args.r:
+        parser.print_usage()
+        parser.exit()
 
-    return rex
+    # Launch the process
+    all_potential_vulnerabilities, all_cve_found, found = find(
+        args.r,
+        tags_matching=args.t,
+        commit_state=args.s,
+        verbose=args.v,
+        defaultpattern=args.p,
+    )
 
-def get_patterns(patterns_path=PATTERNS_PATH):
-    patterns = {}
-    for root, dirs, files in os.walk(patterns_path):
-        path = root.split(os.sep)
-        for f in files:
-            if f.endswith(".prefix") or f.endswith(".suffix"):
-                continue
-            npath = root[len(patterns_path):].split(os.sep)
-            try:
-                npath.remove('')
-            except ValueError:
-                pass
+    # Output the result as json. Can be piped to another software.
+    if not args.c:
+        print(json.dumps(all_potential_vulnerabilities))
+    elif args.c:
+        print(json.dumps(list(all_cve_found)))
 
-            lang = npath[0]
-            severity = npath[1]
-            pattern_category = f
-            
-            try: # FIXME: Is there a better way?
-                a = patterns[lang]
-            except KeyError:
-                patterns[lang] = {}
-            try:
-                a = patterns[lang][severity]
-            except KeyError:
-                patterns[lang][severity] = {}
-            try:
-                a = patterns[lang][severity][pattern_category]
-            except KeyError:
-                rex = build_pattern(root + os.sep + f)
-                patterns[lang][severity][pattern_category] = re.compile(rex)
-
-    return patterns
-
-patterns = get_patterns()
-vulnpatterns = patterns["en"]["medium"]["vuln"]
-cryptopatterns = patterns["en"]["medium"]["crypto"]
-cpatterns = patterns["en"]["medium"]["c"]
-
-if args.p == "vulnpatterns":
-    defaultpattern = vulnpatterns
-elif args.p == "cryptopatterns":
-    defaultpattern = cryptopatterns
-elif args.p == "cpatterns":
-    defaultpattern = cpatterns
-elif args.p == "all":
-    defaultpattern = [vulnpatterns, cryptopatterns, cpatterns]
-else:
-    parser.print_usage()
-    parser.exit()
-
-if not args.r:
-    parser.print_usage()
-    parser.exit()
-else:
-    repo = git.Repo(args.r)
-
-
-found = 0
-potential_vulnerabilities = {}
-cve_found = set()
-
-def find_vuln(commit, pattern=vulnpatterns):
-    m = pattern.search(commit.message)
-    if m:
-        if args.v:
-            print("Match found: {}".format(m.group(0)), file=sys.stderr)
-            print(commit.message, file=sys.stderr)
-            print("---", file=sys.stderr)
-        ret = {}
-        ret['commit'] = commit
-        ret['match'] = m.groups()
-        return ret
-    else:
-        return None
-
-def summary(commit, branch, pattern, origin=None):
-    rcommit = commit
-    cve = extract_cve(rcommit.message)
-    if origin is not None:
-        origin = origin
-        if origin.find('github.com'):
-            origin_github_api = origin.split(':')[1]
-            (org_name, repo_name) = origin_github_api.split('/', 1)
-            if repo_name.find('.git$'):
-                repo_name = re.sub(r".git$","", repo_name)
-            origin_github_api = 'https://api.github.com/repos/{}/{}/commits/{}'.format(org_name, repo_name, rcommit.hexsha)
-
-    else:
-        origin = 'git origin unknown'
-    # deduplication if similar commits on different branches
-    if rcommit.hexsha in potential_vulnerabilities:
-       potential_vulnerabilities[rcommit.hexsha]['branches'].append(branch)
-    else:
-        potential_vulnerabilities[rcommit.hexsha] = {}
-        potential_vulnerabilities[rcommit.hexsha]['message'] = rcommit.message
-        potential_vulnerabilities[rcommit.hexsha]['language'] = langdetect(rcommit.message)
-        potential_vulnerabilities[rcommit.hexsha]['commit-id'] = rcommit.hexsha
-        potential_vulnerabilities[rcommit.hexsha]['summary'] = rcommit.summary
-        potential_vulnerabilities[rcommit.hexsha]['stats'] = rcommit.stats.total
-        potential_vulnerabilities[rcommit.hexsha]['author'] = rcommit.author.name
-        potential_vulnerabilities[rcommit.hexsha]['author-email'] = rcommit.author.email
-        potential_vulnerabilities[rcommit.hexsha]['authored_date'] = rcommit.authored_date
-        potential_vulnerabilities[rcommit.hexsha]['committed_date'] = rcommit.committed_date
-        potential_vulnerabilities[rcommit.hexsha]['branches'] = []
-        potential_vulnerabilities[rcommit.hexsha]['branches'].append(branch)
-        potential_vulnerabilities[rcommit.hexsha]['pattern-selected'] = pattern.pattern
-        potential_vulnerabilities[rcommit.hexsha]['pattern-matches'] = ret['match']
-        potential_vulnerabilities[rcommit.hexsha]['origin'] = origin
-        if origin_github_api:
-            potential_vulnerabilities[commit.hexsha]['origin-github-api'] = origin_github_api
-        potential_vulnerabilities[rcommit.hexsha]['tags'] = []
-        if args.t:
-            if repo.commit(rcommit).hexsha in tagmap:
-                potential_vulnerabilities[rcommit.hexsha]['tags'] = tagmap[repo.commit(rcommit).hexsha]
-        if cve: potential_vulnerabilities[rcommit.hexsha]['cve'] = cve
-        if cve:
-            potential_vulnerabilities[rcommit.hexsha]['state'] = "cve-assigned"
-        else:
-            potential_vulnerabilities[rcommit.hexsha]['state'] = args.s
-
-    return rcommit.hexsha
-
-def extract_cve(commit):
-    cve_find = re.compile(r'CVE-[1-2]\d{1,4}-\d{1,7}', re.IGNORECASE)
-    m = cve_find.findall(commit)
-    if m:
-        for v in m:
-            cve_found.add(v)
-        return m
-    else:
-        return None
-
-repo_heads = repo.heads
-repo_heads_names = [h.name for h in repo_heads]
-print(repo_heads_names, file=sys.stderr)
-origin = repo.remotes.origin.url
-if args.t:
-    tagmap = {}
-    for t in repo.tags:
-        tagmap.setdefault(repo.commit(t).hexsha, []).append(str(t))
-
-for branch in repo_heads_names:
-    commits = list(repo.iter_commits(branch))
-    defaultpattern
-    for commit in commits:
-        if isinstance(defaultpattern, typing.Pattern):
-            ret = find_vuln(commit, pattern=defaultpattern)
-            if ret:
-                rcommit = ret['commit']
-                summary(rcommit, branch, defaultpattern, origin=origin)
-                found += 1
-        elif isinstance(defaultpattern, list):
-            for p in defaultpattern:
-                ret = find_vuln(commit, pattern=p)
-                if ret:
-                    rcommit = ret['commit']
-                    summary(rcommit, branch, p, origin=origin)
-                    found += 1
-if not args.c:
-    print(json.dumps(potential_vulnerabilities))
-elif args.c:
-    print(json.dumps(list(cve_found)))
-
-print("{} CVE referenced found in commit(s)".format(len(list(cve_found))), file=sys.stderr)
-print("Total potential vulnerability found in {} commit(s)".format(found), file=sys.stderr)
+    # Output the result to stderr.
+    print(
+        "{} CVE referenced found in commit(s)".format(len(list(all_cve_found))),
+        file=sys.stderr,
+    )
+    print(
+        "Total potential vulnerability found in {} commit(s)".format(found),
+        file=sys.stderr,
+    )

git_vuln_finder/__init__.py

@@ -0,0 +1,6 @@
+from git_vuln_finder.pattern import build_pattern
+from git_vuln_finder.pattern import get_patterns
+from git_vuln_finder.vulnerability import find_vuln
+from git_vuln_finder.vulnerability import summary
+from git_vuln_finder.vulnerability import extract_cve
+from git_vuln_finder.run import find

git_vuln_finder/pattern.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Finding potential software vulnerabilities from git commit messages
+#
+# Software is free software released under the "GNU Affero General Public License v3.0"
+#
+# This software is part of cve-search.org
+#
+# Copyright (c) 2019-2020 Alexandre Dulaunoy - a@foo.be
+
+
+import os
+import re
+from collections import defaultdict
+
+
+def tree():
+    """Autovivification.
+    Call it a tree or call it 'patterns'.
+    """
+    return defaultdict(tree)
+
+
+PATTERNS_PATH = "./git_vuln_finder/patterns"
+
+
+def build_pattern(pattern_file):
+    fp = open(pattern_file, "r")
+    rex = ""
+    try:
+        prefix_fp = open(pattern_file + ".prefix", "r")
+        rex += prefix_fp.read()
+        prefix_fp.close()
+    except:
+        pass
+
+    for line in fp.readlines():
+        rex += line.rstrip() + "|"
+    rex = rex[:-1]  # We remove the extra '|
+    fp.close()
+
+    try:
+        suffix_fp = open(pattern_file + ".suffix", "r")
+        rex += suffix_fp.read()
+        suffix_fp.close()
+    except:
+        pass
+
+    return rex
+
+
+def get_patterns(patterns_path=PATTERNS_PATH):
+    patterns = tree()
+    for root, dirs, files in os.walk(patterns_path):
+        path = root.split(os.sep)
+        for f in files:
+            if f.endswith(".prefix") or f.endswith(".suffix"):
+                continue
+            npath = root[len(patterns_path) :].split(os.sep)
+            try:
+                npath.remove("")
+            except ValueError:
+                pass
+
+            lang = npath[0]
+            severity = npath[1]
+            pattern_category = f
+
+            rex = build_pattern(root + os.sep + f)
+            patterns[lang][severity][pattern_category] = re.compile(rex)
+
+    return patterns

git_vuln_finder/run.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Finding potential software vulnerabilities from git commit messages
+#
+# Software is free software released under the "GNU Affero General Public License v3.0"
+#
+# This software is part of cve-search.org
+#
+# Copyright (c) 2019-2020 Alexandre Dulaunoy - a@foo.be
+
+import sys
+import git
+import typing
+from git_vuln_finder import get_patterns, find_vuln, summary
+
+
+def find(
+    repo,
+    tags_matching=False,
+    commit_state="under-review",
+    verbose=False,
+    defaultpattern="all",
+):
+    # Initialization of the variables for the results
+    repo = git.Repo(repo)
+    found = 0
+    all_potential_vulnerabilities = {}
+    all_cve_found = set()
+
+    # Initialization of the patterns
+    patterns = get_patterns()
+    vulnpatterns = patterns["en"]["medium"]["vuln"]
+    cryptopatterns = patterns["en"]["medium"]["crypto"]
+    cpatterns = patterns["en"]["medium"]["c"]
+
+    if defaultpattern == "vulnpatterns":
+        defaultpattern = vulnpatterns
+    elif defaultpattern == "cryptopatterns":
+        defaultpattern = cryptopatterns
+    elif defaultpattern == "cpatterns":
+        defaultpattern = cpatterns
+    elif defaultpattern == "all":
+        defaultpattern = [vulnpatterns, cryptopatterns, cpatterns]
+
+    repo_heads = repo.heads
+    repo_heads_names = [h.name for h in repo_heads]
+    print(repo_heads_names, file=sys.stderr)
+    origin = repo.remotes.origin.url
+    tagmap = {}
+    if tags_matching:
+        for t in repo.tags:
+            tagmap.setdefault(repo.commit(t).hexsha, []).append(str(t))
+
+    for branch in repo_heads_names:
+        commits = list(repo.iter_commits(branch))
+        defaultpattern
+        for commit in commits:
+            if isinstance(defaultpattern, typing.Pattern):
+                ret = find_vuln(commit, pattern=defaultpattern, verbose=verbose)
+                if ret:
+                    rcommit = ret["commit"]
+                    _, potential_vulnerabilities, cve_found = summary(
+                        repo,
+                        rcommit,
+                        branch,
+                        tagmap,
+                        defaultpattern,
+                        origin=origin,
+                        vuln_match=ret["match"],
+                        tags_matching=tags_matching,
+                        commit_state=commit_state,
+                    )
+                    all_potential_vulnerabilities.update(potential_vulnerabilities)
+                    all_cve_found.update(cve_found)
+                    found += 1
+            elif isinstance(defaultpattern, list):
+                for p in defaultpattern:
+                    ret = find_vuln(commit, pattern=p, verbose=verbose)
+                    if ret:
+                        rcommit = ret["commit"]
+                        _, potential_vulnerabilities, cve_found = summary(
+                            repo,
+                            rcommit,
+                            branch,
+                            tagmap,
+                            p,
+                            origin=origin,
+                            vuln_match=ret["match"],
+                            tags_matching=tags_matching,
+                            commit_state=commit_state,
+                        )
+                        all_potential_vulnerabilities.update(potential_vulnerabilities)
+                        all_cve_found.update(cve_found)
+                        found += 1
+
+        return all_potential_vulnerabilities, all_cve_found, found

git_vuln_finder/vulnerability.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Finding potential software vulnerabilities from git commit messages
+#
+# Software is free software released under the "GNU Affero General Public License v3.0"
+#
+# This software is part of cve-search.org
+#
+# Copyright (c) 2019-2020 Alexandre Dulaunoy - a@foo.be
+
+import re
+import sys
+from langdetect import detect as langdetect
+
+
+def find_vuln(commit, pattern, verbose=False):
+    """Find a potential vulnerability from a commit message thanks to a regex
+    pattern.
+    """
+    m = pattern.search(commit.message)
+    if m:
+        if verbose:
+            print("Match found: {}".format(m.group(0)), file=sys.stderr)
+            print(commit.message, file=sys.stderr)
+            print("---", file=sys.stderr)
+        ret = {}
+        ret["commit"] = commit
+        ret["match"] = m.groups()
+        return ret
+    else:
+        return None
+
+
+def summary(
+    repo,
+    commit,
+    branch,
+    tagmap,
+    pattern,
+    origin=None,
+    vuln_match=None,
+    tags_matching=False,
+    commit_state="under-review",
+):
+    potential_vulnerabilities = {}
+    rcommit = commit
+    cve, cve_found = extract_cve(rcommit.message)
+    if origin is not None:
+        origin = origin
+        if origin.find("github.com"):
+            origin_github_api = origin.split(":")[1]
+            (org_name, repo_name) = origin_github_api.split("/", 1)
+            if repo_name.find(".git$"):
+                repo_name = re.sub(r".git$", "", repo_name)
+            origin_github_api = "https://api.github.com/repos/{}/{}/commits/{}".format(
+                org_name, repo_name, rcommit.hexsha
+            )
+
+    else:
+        origin = "git origin unknown"
+    # deduplication if similar commits on different branches
+    if rcommit.hexsha in potential_vulnerabilities:
+        potential_vulnerabilities[rcommit.hexsha]["branches"].append(branch)
+    else:
+        potential_vulnerabilities[rcommit.hexsha] = {}
+        potential_vulnerabilities[rcommit.hexsha]["message"] = rcommit.message
+        potential_vulnerabilities[rcommit.hexsha]["language"] = langdetect(
+            rcommit.message
+        )
+        potential_vulnerabilities[rcommit.hexsha]["commit-id"] = rcommit.hexsha
+        potential_vulnerabilities[rcommit.hexsha]["summary"] = rcommit.summary
+        potential_vulnerabilities[rcommit.hexsha]["stats"] = rcommit.stats.total
+        potential_vulnerabilities[rcommit.hexsha]["author"] = rcommit.author.name
+        potential_vulnerabilities[rcommit.hexsha]["author-email"] = rcommit.author.email
+        potential_vulnerabilities[rcommit.hexsha][
+            "authored_date"
+        ] = rcommit.authored_date
+        potential_vulnerabilities[rcommit.hexsha][
+            "committed_date"
+        ] = rcommit.committed_date
+        potential_vulnerabilities[rcommit.hexsha]["branches"] = []
+        potential_vulnerabilities[rcommit.hexsha]["branches"].append(branch)
+        potential_vulnerabilities[rcommit.hexsha]["pattern-selected"] = pattern.pattern
+        potential_vulnerabilities[rcommit.hexsha]["pattern-matches"] = vuln_match
+        potential_vulnerabilities[rcommit.hexsha]["origin"] = origin
+        if origin_github_api:
+            potential_vulnerabilities[commit.hexsha][
+                "origin-github-api"
+            ] = origin_github_api
+        potential_vulnerabilities[rcommit.hexsha]["tags"] = []
+        if tags_matching:
+            if repo.commit(rcommit).hexsha in tagmap:
+                potential_vulnerabilities[rcommit.hexsha]["tags"] = tagmap[
+                    repo.commit(rcommit).hexsha
+                ]
+        if cve:
+            potential_vulnerabilities[rcommit.hexsha]["cve"] = cve
+            potential_vulnerabilities[rcommit.hexsha]["state"] = "cve-assigned"
+        else:
+            potential_vulnerabilities[rcommit.hexsha]["state"] = commit_state
+
+    return rcommit.hexsha, potential_vulnerabilities, cve_found
+
+
+def extract_cve(commit):
+    cve_found = set()
+    cve_find = re.compile(r"CVE-[1-2]\d{1,4}-\d{1,7}", re.IGNORECASE)
+    m = cve_find.findall(commit)
+    if m:
+        for v in m:
+            cve_found.add(v)
+        return m, cve_found
+    else:
+        return None, set()

poetry.lock

@@ -0,0 +1,336 @@
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.3.0"
+
+[[package]]
+category = "dev"
+description = "Classes Without Boilerplate"
+name = "attrs"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.3.0"
+
+[package.extras]
+azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
+dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
+[[package]]
+category = "dev"
+description = "Cross-platform colored terminal text."
+marker = "sys_platform == \"win32\""
+name = "colorama"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.4.3"
+
+[[package]]
+category = "dev"
+description = "Discover and load entry points from installed packages."
+name = "entrypoints"
+optional = false
+python-versions = ">=2.7"
+version = "0.3"
+
+[[package]]
+category = "dev"
+description = "the modular source code checker: pep8, pyflakes and co"
+name = "flake8"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "3.7.9"
+
+[package.dependencies]
+entrypoints = ">=0.3.0,<0.4.0"
+mccabe = ">=0.6.0,<0.7.0"
+pycodestyle = ">=2.5.0,<2.6.0"
+pyflakes = ">=2.1.0,<2.2.0"
+
+[[package]]
+category = "main"
+description = "Git Object Database"
+name = "gitdb2"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.0.6"
+
+[package.dependencies]
+smmap2 = ">=2.0.0"
+
+[[package]]
+category = "main"
+description = "Python Git Library"
+name = "gitpython"
+optional = false
+python-versions = ">=3.0, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "3.0.5"
+
+[package.dependencies]
+gitdb2 = ">=2.0.0"
+
+[[package]]
+category = "dev"
+description = "Read metadata from Python packages"
+marker = "python_version < \"3.8\""
+name = "importlib-metadata"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+version = "1.3.0"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "rst.linker"]
+testing = ["packaging", "importlib-resources"]
+
+[[package]]
+category = "main"
+description = "Language detection library ported from Google's language-detection."
+name = "langdetect"
+optional = false
+python-versions = "*"
+version = "1.0.7"
+
+[package.dependencies]
+six = "*"
+
+[[package]]
+category = "dev"
+description = "McCabe checker, plugin for flake8"
+name = "mccabe"
+optional = false
+python-versions = "*"
+version = "0.6.1"
+
+[[package]]
+category = "dev"
+description = "More routines for operating on iterables, beyond itertools"
+name = "more-itertools"
+optional = false
+python-versions = ">=3.5"
+version = "8.0.2"
+
+[[package]]
+category = "dev"
+description = "Core utilities for Python packages"
+name = "packaging"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "20.0"
+
+[package.dependencies]
+pyparsing = ">=2.0.2"
+six = "*"
+
+[[package]]
+category = "dev"
+description = "plugin and hook calling mechanisms for python"
+name = "pluggy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.13.1"
+
+[package.dependencies]
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
+[[package]]
+category = "dev"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+name = "py"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.8.1"
+
+[[package]]
+category = "dev"
+description = "Python style guide checker"
+name = "pycodestyle"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.5.0"
+
+[[package]]
+category = "dev"
+description = "passive checker of Python programs"
+name = "pyflakes"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.1.1"
+
+[[package]]
+category = "dev"
+description = "Python parsing module"
+name = "pyparsing"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+version = "2.4.6"
+
+[[package]]
+category = "dev"
+description = "pytest: simple powerful testing with Python"
+name = "pytest"
+optional = false
+python-versions = ">=3.5"
+version = "5.3.2"
+
+[package.dependencies]
+atomicwrites = ">=1.0"
+attrs = ">=17.4.0"
+colorama = "*"
+more-itertools = ">=4.0.0"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
+py = ">=1.5.0"
+wcwidth = "*"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
+[[package]]
+category = "main"
+description = "Python 2 and 3 compatibility utilities"
+name = "six"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+version = "1.13.0"
+
+[[package]]
+category = "main"
+description = "A pure Python implementation of a sliding window memory map manager"
+name = "smmap2"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.0.5"
+
+[[package]]
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+description = "Measures number of Terminal column cells of wide-character codes"
+name = "wcwidth"
+optional = false
+python-versions = "*"
+version = "0.1.8"
+
+[[package]]
+category = "dev"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+marker = "python_version < \"3.8\""
+name = "zipp"
+optional = false
+python-versions = ">=2.7"
+version = "0.6.0"
+
+[package.dependencies]
+more-itertools = "*"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
+testing = ["pathlib2", "contextlib2", "unittest2"]
+
+[metadata]
+content-hash = "9faea1409b72575568ba911a1729a6cc7994603342a0d5ae7b045ed15cd091f8"
+python-versions = "^3.6"
+
+[metadata.files]
+atomicwrites = [
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+]
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+    {file = "attrs-19.3.0.tar.gz", hash = "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"},
+]
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+    {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
+]
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+    {file = "entrypoints-0.3.tar.gz", hash = "sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451"},
+]
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+]
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+]
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+]
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+]
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+]
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+    {file = "mccabe-0.6.1.tar.gz", hash = "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"},
+]
+more-itertools = [
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+]
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+]
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+    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
+]
+py = [
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+    {file = "py-1.8.1.tar.gz", hash = "sha256:5e27081401262157467ad6e7f851b7aa402c5852dbcb3dae06768434de5752aa"},
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+]
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+wcwidth = [
+    {file = "wcwidth-0.1.8-py2.py3-none-any.whl", hash = "sha256:8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603"},
+    {file = "wcwidth-0.1.8.tar.gz", hash = "sha256:f28b3e8a6483e5d49e7f8949ac1a78314e740333ae305b4ba5defd3e74fb37a8"},
+]
+zipp = [
+    {file = "zipp-0.6.0-py2.py3-none-any.whl", hash = "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"},
+    {file = "zipp-0.6.0.tar.gz", hash = "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e"},
+]

pyproject.toml

@@ -0,0 +1,60 @@
+[tool.poetry]
+name = "git-vuln-finder"
+version = "1.0.0"
+description = "Finding potential software vulnerabilities from git commit messages."
+authors = [
+    "Alexandre Dulaunoy <a@foo.be>"
+]
+license = "AGPL-3.0-or-later"
+
+readme = "README.md"
+
+homepage = "https://github.com/cve-search/git-vuln-finder"
+repository = "https://github.com/cve-search/git-vuln-finder"
+documentation = ""
+
+keywords = [
+    "git",
+    "cve",
+    "scanner",
+    "cve-search",
+    "cve-scanning",
+    "software-vulnerability",
+    "software-vulnerabilities"
+]
+
+classifiers = [
+    "Development Status :: 4 - Beta Copy",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Information Technology",
+    "Intended Audience :: Science/Research",
+    "Topic :: Security",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)"
+]
+
+include = [
+    "AUTHORS",
+    "COPYING",
+    "bin/*"
+]
+
+[tool.poetry.scripts]
+git-vuln-finder = "bin.finder:main"
+
+[tool.poetry.dependencies]
+python = "^3.6"
+langdetect = "^1.0.7"
+gitpython = "^3.0.5"
+
+[tool.poetry.dev-dependencies]
+flake8 = "^3.7.9"
+pytest = "^5.3.2"
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"

tests/conftest.py

@@ -0,0 +1,19 @@
+
+import os
+import pytest
+
+from git import Repo
+
+
+@pytest.fixture(scope='session')
+def clone_curl():
+    """Clone the repository of curl for the tests."""
+    git_url = 'https://github.com/curl/curl.git'
+    repo_dir = './test_repos/curl'
+    repo = Repo.clone_from(url=git_url, to_path=repo_dir)
+    #repo.heads['curl-7_67_0'].checkout()
+
+    def teardown():
+        os.unlink(repo_dir)
+
+    return repo_dir

tests/test_finder.py

@@ -0,0 +1,10 @@
+
+
+from git_vuln_finder import find
+
+
+def test_find_vuln(clone_curl):
+    all_potential_vulnerabilities, all_cve_found, found = find("./test_repos/curl/")
+
+    #assert len(list(all_cve_found)) == 64
+    assert "CVE-2018-1000122" in all_cve_found