1 files changed, 545 insertions, 0 deletions
diff --git a/hex-zero.py b/hex-zero.py
new file mode 100755
index 0000000..b6fcdd6
--- /dev/null
+++ b/hex-zero.py
@@ -0,0 +1,545 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# https://stackoverflow.com/a/34831345/3569534
+
+"""
+    Copyright © 2020 Mia Herkt
+    Licensed under the EUPL, Version 1.2 or - as soon as approved
+    by the European Commission - subsequent versions of the EUPL
+    (the "License");
+    You may not use this work except in compliance with the License.
+    You may obtain a copy of the license at:
+
+        https://joinup.ec.europa.eu/software/page/eupl
+
+    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.
+"""
+
+from flask import Flask, abort, escape, make_response, redirect, request, send_from_directory, url_for, Response
+from flask_sqlalchemy import SQLAlchemy
+from flask_script import Manager, Server
+from flask_migrate import Migrate, MigrateCommand
+from hashlib import sha256
+from humanize import naturalsize
+from magic import Magic
+from mimetypes import guess_extension
+import os, sys
+import requests
+from short_url import UrlEncoder
+from validators import url as url_valid
+
+app = Flask(__name__)
+app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+
+app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///db.sqlite" # "postgresql://0x0@/0x0"
+app.config["PREFERRED_URL_SCHEME"] = "https" # nginx users: make sure to have 'uwsgi_param UWSGI_SCHEME $scheme;' in your config
+app.config["MAX_CONTENT_LENGTH"] = 512 * 1024 * 1024
+app.config["MAX_URL_LENGTH"] = 4096
+app.config["FHOST_STORAGE_PATH"] = "up"
+app.config["FHOST_USE_X_ACCEL_REDIRECT"] = True # expect nginx by default
+app.config["USE_X_SENDFILE"] = False
+app.config["FHOST_EXT_OVERRIDE"] = {
+    "audio/flac" : ".flac",
+    "image/gif" : ".gif",
+    "image/jpeg" : ".jpg",
+    "image/png" : ".png",
+    "image/svg+xml" : ".svg",
+    "video/webm" : ".webm",
+    "video/x-matroska" : ".mkv",
+    "application/octet-stream" : ".bin",
+    "text/plain" : ".log",
+    "text/plain" : ".txt",
+    "text/x-diff" : ".diff",
+}
+
+# default blacklist to avoid AV mafia extortion
+app.config["FHOST_MIME_BLACKLIST"] = [
+    "application/x-dosexec",
+    "application/java-archive",
+    "application/java-vm"
+]
+
+app.config["FHOST_UPLOAD_BLACKLIST"] = "tornodes.txt"
+
+app.config["NSFW_DETECT"] = False
+app.config["NSFW_THRESHOLD"] = 0.608
+
+# read config file
+app.config.from_pyfile("hex-zero.conf", silent=True)
+
+# read html template file
+with open(app.config["FHOST_FRONTPAGE"], "r") as j:
+    frontpagestring = j.read()
+
+if app.config["NSFW_DETECT"]:
+    from nsfw_detect import NSFWDetector
+    nsfw = NSFWDetector()
+
+try:
+    mimedetect = Magic(mime=True, mime_encoding=False)
+except:
+    print("""Error: You have installed the wrong version of the 'magic' module.
+Please install python-magic.""")
+    sys.exit(1)
+
+if not os.path.exists(app.config["FHOST_STORAGE_PATH"]):
+    os.mkdir(app.config["FHOST_STORAGE_PATH"])
+
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
+
+manager = Manager(app)
+manager.add_command("db", MigrateCommand)
+
+su = UrlEncoder(alphabet='DEQhd2uFteibPwq0SWBInTpA_jcZL5GKz3YCR14Ulk87Jors9vNHgfaOmMXy6Vx-', block_size=16)
+
+class URL(db.Model):
+    id = db.Column(db.Integer, primary_key = True)
+    url = db.Column(db.UnicodeText, unique = True)
+
+    def __init__(self, url):
+        self.url = url
+
+    def getname(self):
+        return su.enbase(self.id, 1)
+
+    def geturl(self):
+        return url_for("get", path=self.getname(), _external=True) + "\n"
+
+class File(db.Model):
+    id = db.Column(db.Integer, primary_key = True)
+    sha256 = db.Column(db.String, unique = True)
+    ext = db.Column(db.UnicodeText)
+    mime = db.Column(db.UnicodeText)
+    addr = db.Column(db.UnicodeText)
+    removed = db.Column(db.Boolean, default=False)
+    nsfw_score = db.Column(db.Float)
+
+    def __init__(self, sha256, ext, mime, addr, nsfw_score):
+        self.sha256 = sha256
+        self.ext = ext
+        self.mime = mime
+        self.addr = addr
+        self.nsfw_score = nsfw_score
+
+    def getname(self):
+        return u"{0}{1}".format(su.enbase(self.id, 1), self.ext)
+
+    def geturl(self):
+        n = self.getname()
+        o = n
+
+        if self.nsfw_score and self.nsfw_score > app.config["NSFW_THRESHOLD"]:
+            o = url_for("get", path=n, _external=True, _anchor="nsfw") + "\n"
+        else:
+            o = url_for("get", path=n, _external=True) + "\n"
+        return o.replace("http://" + app.config["APP_HOST_LISTEN"] + ":" + str(app.config["APP_PORT"]),app.config["APP_URL"])
+
+    def pprint(self):
+        print("url: {}".format(self.getname()))
+        vals = vars(self)
+
+        for v in vals:
+            if not v.startswith("_sa"):
+                print("{}: {}".format(v, vals[v]))
+
+def getpath(fn):
+    return os.path.join(app.config["FHOST_STORAGE_PATH"], fn)
+
+def fhost_url(scheme=None):
+    return app.config["APP_URL"]
+    if not scheme:
+        return url_for(".fhost", _external=True).rstrip("/")
+    else:
+        return url_for(".fhost", _external=True, _scheme=scheme).rstrip("/")
+
+def is_fhost_url(url):
+    return url.startswith(fhost_url()) or url.startswith(fhost_url("https"))
+
+def shorten(url):
+    # handler to convert gopher links to HTTP(S) proxy
+    gopher = "gopher://"
+    length = len(gopher)
+    if url[:length] == gopher:
+        url = "https://gopher.envs.net/{}".format(url[length:])
+
+    if len(url) > app.config["MAX_URL_LENGTH"]:
+        abort(414)
+
+    if not url_valid(url) or is_fhost_url(url) or "\n" in url:
+        abort(400)
+
+    existing = URL.query.filter_by(url=url).first()
+
+    if existing:
+        return existing.geturl()
+    else:
+        u = URL(url)
+        db.session.add(u)
+        db.session.commit()
+
+        return u.geturl()
+
+def in_upload_bl(addr):
+    if os.path.isfile(app.config["FHOST_UPLOAD_BLACKLIST"]):
+        with open(app.config["FHOST_UPLOAD_BLACKLIST"], "r") as bl:
+            check = addr.lstrip("::ffff:")
+            for l in bl.readlines():
+                if not l.startswith("#"):
+                    if check == l.rstrip():
+                        return True
+
+    return False
+
+def store_file(f, addr):
+    if in_upload_bl(addr):
+        return "Your host is blocked from uploading files.\n", 451
+
+    data = f.stream.read()
+    digest = sha256(data).hexdigest()
+    existing = File.query.filter_by(sha256=digest).first()
+
+    if existing:
+        if existing.removed:
+            return legal()
+
+        epath = getpath(existing.sha256)
+
+        if not os.path.exists(epath):
+            with open(epath, "wb") as of:
+                of.write(data)
+
+        if existing.nsfw_score == None:
+            if app.config["NSFW_DETECT"]:
+                existing.nsfw_score = nsfw.detect(epath)
+
+        os.utime(epath, None)
+        existing.addr = addr
+        db.session.commit()
+
+        return existing.geturl()
+    else:
+        guessmime = mimedetect.from_buffer(data)
+
+        if not f.content_type or not "/" in f.content_type or f.content_type == "application/octet-stream":
+            mime = guessmime
+        else:
+            mime = f.content_type
+
+        if mime in app.config["FHOST_MIME_BLACKLIST"] or guessmime in app.config["FHOST_MIME_BLACKLIST"]:
+            abort(415)
+
+        if mime.startswith("text/") and not "charset" in mime:
+            mime += "; charset=utf-8"
+
+        ext = os.path.splitext(f.filename)[1]
+
+        if not ext:
+            gmime = mime.split(";")[0]
+
+            if not gmime in app.config["FHOST_EXT_OVERRIDE"]:
+                ext = guess_extension(gmime)
+            else:
+                ext = app.config["FHOST_EXT_OVERRIDE"][gmime]
+        else:
+            ext = ext[:8]
+
+        if not ext:
+            ext = ".bin"
+
+        spath = getpath(digest)
+
+        with open(spath, "wb") as of:
+            of.write(data)
+
+        if app.config["NSFW_DETECT"]:
+            nsfw_score = nsfw.detect(spath)
+        else:
+            nsfw_score = None
+
+        sf = File(digest, ext, mime, addr, nsfw_score)
+        db.session.add(sf)
+        db.session.commit()
+
+        return sf.geturl()
+
+def store_url(url, addr):
+    # handler to convert gopher links to HTTP(S) proxy
+    gopher = "gopher://"
+    length = len(gopher)
+    if url[:length] == gopher:
+        url = "https://gopher.envs.net/{}".format(url[length:])
+
+    if is_fhost_url(url):
+        return segfault(508)
+
+    h = { "Accept-Encoding" : "identity" }
+    r = requests.get(url, stream=True, verify=False, headers=h)
+
+    try:
+        r.raise_for_status()
+    except requests.exceptions.HTTPError as e:
+        return str(e) + "\n"
+
+    if "content-length" in r.headers:
+        l = int(r.headers["content-length"])
+
+        if l < app.config["MAX_CONTENT_LENGTH"]:
+            def urlfile(**kwargs):
+                return type('',(),kwargs)()
+
+            f = urlfile(stream=r.raw, content_type=r.headers["content-type"], filename="")
+
+            return store_file(f, addr)
+        else:
+            hl = naturalsize(l, binary = True)
+            hml = naturalsize(app.config["MAX_CONTENT_LENGTH"], binary=True)
+
+            return "Remote file too large ({0} > {1}).\n".format(hl, hml), 413
+    else:
+        return "Could not determine remote file size (no Content-Length in response header; shoot admin).\n", 411
+
+@app.route("/<path:path>")
+def get(path):
+    p = os.path.splitext(path)
+    id = su.debase(p[0])
+
+    if p[1]:
+        f = File.query.get(id)
+
+        if f and f.ext == p[1]:
+            if f.removed:
+                return legal()
+
+            fpath = getpath(f.sha256)
+
+            if not os.path.exists(fpath):
+                abort(404)
+
+            fsize = os.path.getsize(fpath)
+
+            if app.config["FHOST_USE_X_ACCEL_REDIRECT"]:
+                response = make_response()
+                response.headers["Content-Type"] = f.mime
+                response.headers["Content-Length"] = fsize
+                response.headers["X-Accel-Redirect"] = "/" + fpath
+                return response
+            else:
+                return send_from_directory(app.config["FHOST_STORAGE_PATH"], f.sha256, mimetype = f.mime)
+    else:
+        u = URL.query.get(id)
+
+        if u:
+            return redirect(u.url)
+
+    abort(404)
+
+@app.route("/dump_files/")
+@app.route("/dump_files/<int:start>")
+def dump_files(start=0):
+    meta = "#FORMAT: BEACON\n#PREFIX: {}/\n\n".format(fhost_url("https"))
+
+    def gen():
+        yield meta
+
+        for file in File.query.order_by(File.id.asc()).offset(start):
+            yield file.getname() + "|" + str(file.id) + "\n"
+
+    return Response(gen(), mimetype="text/plain")
+
+@app.route("/dump_urls/")
+@app.route("/dump_urls/<int:start>")
+def dump_urls(start=0):
+    meta = "#FORMAT: BEACON\n#PREFIX: {}/\n\n".format(fhost_url("https"))
+
+    def gen():
+        yield meta
+
+        for url in URL.query.order_by(URL.id.asc()).offset(start):
+            if url.url.startswith("http") or url.url.startswith("https"):
+                bar = "|"
+            else:
+                bar = "||"
+
+            yield url.getname() + bar + url.url + "\n"
+
+    return Response(gen(), mimetype="text/plain")
+
+@app.route("/", methods=["GET", "POST"])
+def fhost():
+    if request.method == "POST":
+        out = None
+
+        if "file" in request.files:
+            if app.config["USE_HTTP_X_FORWARDED_FOR"]:
+               stored_ip_address = request.environ["HTTP_X_FORWARDED_FOR"]
+            else:
+               stored_ip_address = request.remote_addr
+            out = store_file(request.files["file"], stored_ip_address)
+        elif "url" in request.form:
+            out = store_url(request.form["url"], request.remote_addr)
+        elif "shorten" in request.form:
+            out = shorten(request.form["shorten"])
+
+        if not out == None:
+            return Response(out, mimetype="text/plain")
+
+        abort(400)
+    else:
+        fmts = list(app.config["FHOST_EXT_OVERRIDE"])
+        fmts.sort()
+        maxsize = naturalsize(app.config["MAX_CONTENT_LENGTH"], binary=True)
+        maxsizenum, maxsizeunit = maxsize.split(" ")
+        maxsizenum = float(maxsizenum)
+        maxsizehalf = maxsizenum / 2
+
+        if maxsizenum.is_integer():
+            maxsizenum = int(maxsizenum)
+        if maxsizehalf.is_integer():
+            maxsizehalf = int(maxsizehalf)
+
+        # python-interpreted variables
+        return frontpagestring.format(fhost_url(),
+           maxsize, str(maxsizehalf).rjust(27), str(maxsizenum).rjust(27),
+           maxsizeunit.rjust(54),
+           ", ".join(app.config["FHOST_MIME_BLACKLIST"]),fhost_url().split("/",2)[2],
+           app.config["APP_URL"], app.config["ADMIN_EMAIL"])
+
+@app.route("/robots.txt")
+def robots():
+    return """User-agent: *
+Disallow: /
+"""
+
+def legal():
+    return "451 Unavailable For Legal Reasons\n", 451
+
+@app.errorhandler(400)
+@app.errorhandler(404)
+@app.errorhandler(414)
+@app.errorhandler(415)
+def segfault(e):
+    return "Segmentation fault\n", e.code
+
+@app.errorhandler(404)
+def notfound(e):
+    return make_response("404 File not found: {0}/{1}".format(fhost_url(),request.path.lstrip("/")),404)
+
+@manager.command
+def debug():
+    app.config["FHOST_USE_X_ACCEL_REDIRECT"] = False
+    app.run(debug=True, port=4562,host="0.0.0.0")
+
+@manager.command
+def permadelete(name):
+    id = su.debase(name)
+    f = File.query.get(id)
+
+    if f:
+        if os.path.exists(getpath(f.sha256)):
+            os.remove(getpath(f.sha256))
+        f.removed = True
+        db.session.commit()
+
+@manager.command
+def query(name):
+    id = su.debase(name)
+    f = File.query.get(id)
+
+    if f:
+        f.pprint()
+
+@manager.command
+def queryhash(h):
+    f = File.query.filter_by(sha256=h).first()
+
+    if f:
+        f.pprint()
+
+@manager.command
+def queryaddr(a, nsfw=False, removed=False):
+    res = File.query.filter_by(addr=a)
+
+    if not removed:
+        res = res.filter(File.removed != True)
+
+    if nsfw:
+        res = res.filter(File.nsfw_score > app.config["NSFW_THRESHOLD"])
+
+    for f in res:
+        f.pprint()
+
+@manager.command
+def deladdr(a):
+    res = File.query.filter_by(addr=a).filter(File.removed != True)
+
+    for f in res:
+        if os.path.exists(getpath(f.sha256)):
+            os.remove(getpath(f.sha256))
+        f.removed = True
+
+    db.session.commit()
+
+def nsfw_detect(f):
+    try:
+        open(f["path"], 'r').close()
+        f["nsfw_score"] = nsfw.detect(f["path"])
+        return f
+    except:
+        return None
+
+@manager.command
+def update_nsfw():
+    if not app.config["NSFW_DETECT"]:
+        print("NSFW detection is disabled in app config")
+        return 1
+
+    from multiprocessing import Pool
+    import tqdm
+
+    res = File.query.filter_by(nsfw_score=None, removed=False)
+
+    with Pool() as p:
+        results = []
+        work = [{ "path" : getpath(f.sha256), "id" : f.id} for f in res]
+
+        for r in tqdm.tqdm(p.imap_unordered(nsfw_detect, work), total=len(work)):
+            if r:
+                results.append({"id": r["id"], "nsfw_score" : r["nsfw_score"]})
+
+        db.session.bulk_update_mappings(File, results)
+        db.session.commit()
+
+
+@manager.command
+def querybl(nsfw=False, removed=False):
+    blist = []
+    if os.path.isfile(app.config["FHOST_UPLOAD_BLACKLIST"]):
+        with open(app.config["FHOST_UPLOAD_BLACKLIST"], "r") as bl:
+            for l in bl.readlines():
+                if not l.startswith("#"):
+                    if not ":" in l:
+                        blist.append("::ffff:" + l.rstrip())
+                    else:
+                        blist.append(l.strip())
+
+    res = File.query.filter(File.addr.in_(blist))
+
+    if not removed:
+        res = res.filter(File.removed != True)
+
+    if nsfw:
+        res = res.filter(File.nsfw_score > app.config["NSFW_THRESHOLD"])
+
+    for f in res:
+        f.pprint()
+
+if __name__ == "__main__":
+    # allow port adjustment
+    manager.add_command('runserver', Server(host=app.config["APP_HOST_LISTEN"], port=app.config["APP_PORT"]))
+    manager.run()