easyctf-2017/server/api/user.py

from flask import Blueprint, make_response, session, request, redirect, url_for
from flask import current_app as app
from voluptuous import Schema, Length, Required

from models import db, LoginTokens, Users
from decorators import api_wrapper, WebException
from schemas import verify_to_schema, check

import datetime
import logger
import re
import requests
import team
import utils

###############
# USER ROUTES #
###############

blueprint = Blueprint("user", __name__)

@blueprint.route("/forgot", methods=["POST"])
@blueprint.route("/forgot/<token>", methods=["GET", "POST"])
@api_wrapper
def user_forgot_password(token=None):
	params = utils.flat_multi(request.form)
	if token is not None:
		user = get_user(reset_token=token).first()
		if user is None:
			raise WebException("Invalid reset token.")

		# We are viewing the actual reset form
		if request.method == "GET":
			return { "success": 1, "message": ""}

		# Submission of actual reset form
		if request.method == "POST":
			password = params.get("password")
			confirm_password = params.get("confirm_password")
			if password != confirm_password:
				raise WebException("Passwords do not match.")
			else:
				user.password = utils.hash_password(password)
				user.reset_token = None
				current_session = db.session.object_session(user)
				current_session.add(user)
				current_session.commit()
				return { "success": 1, "message": "Success!" }
	else:
		email = params.get("email").lower()

		user = get_user(email=email).first()
		if user is None:
			raise WebException("User with that email does not exist.")

		token = utils.generate_string(length=64)
		user.reset_token = token
		current_session = db.session.object_session(user)
		current_session.add(user)
		current_session.commit()

		reset_link = "%s/forgot/%s" % ("127.0.0.1:8000", token)
		subject = "EasyCTF password reset"
		body = """%s,\n\nA request to reset your EasyCTF password has been made. If you did not request this password reset, you may safely ignore this email and delete it.\n\nYou may reset your password by clicking this link or pasting it to your browser.\n\n%s\n\nThis link can only be used once, and will lead you to a page where you can reset your password.\n\nGood luck!\n\n- The EasyCTF Team""" % (user.username, reset_link)
		response = utils.send_email(email, subject, body).json()
		if "Queued" in response["message"]:
			return { "success": 1, "message": "Email sent to %s" % email }
		else:
			raise WebException(response["message"])

@blueprint.route("/register", methods=["POST"])
@api_wrapper
def user_register():
	params = utils.flat_multi(request.form)

	name = params.get("name")
	email = params.get("email")
	username = params.get("username")
	password = params.get("password")
	password_confirm = params.get("password_confirm")
	utype = int(params.get("type"))

	if password != password_confirm:
		raise WebException("Passwords do not match.")
	verify_to_schema(UserSchema, params)

	user = Users(name, username, email, password, utype)
	with app.app_context():
		db.session.add(user)
		db.session.commit()

	logger.log(__name__, logger.INFO, "%s registered with %s" % (name.encode("utf-8"), email.encode("utf-8")))
	login_user(username, password)

	return { "success": 1, "message": "Success!" }

@blueprint.route("/logout", methods=["GET"])
@api_wrapper
def user_logout():
	sid = session["sid"]
	username = session["username"]
	with app.app_context():
		expired = LoginTokens.query.filter_by(username=username).all()
		for expired_token in expired: db.session.delete(expired_token)
		db.session.commit()
	session.clear()

@blueprint.route("/login", methods=["POST"])
@api_wrapper
def user_login():
	params = utils.flat_multi(request.form)

	username = params.get("username")
	password = params.get("password")

	result = login_user(username, password)
	if result != True:
		raise WebException("Please check if your username/password are correct.")

	return { "success": 1, "message": "Success!" }

@blueprint.route("/status", methods=["GET"])
@api_wrapper
def user_status():
	logged_in = is_logged_in()
	result = {
		"success": 1,
		"logged_in": logged_in,
		"admin": is_admin(),
		"username": session["username"] if logged_in else "",
	}
	if logged_in:
		result["has_team"] = in_team(get_user().first())

	return result

@blueprint.route("/info", methods=["GET"])
@api_wrapper
def user_info():
	logged_in = is_logged_in()
	username = utils.flat_multi(request.args).get("username")
	if username is None:
		if logged_in:
			username = session["username"]
	if username is None:
		raise WebException("No user specified.")
	me = False if not("username" in session) else username.lower() == session["username"].lower()
	user = get_user(username_lower=username.lower()).first()
	if user is None:
		raise WebException("User not found.")

	show_email = me if logged_in else False
	user_in_team = in_team(user)
	userdata = {
		"user_found": True,
		"name": user.name,
		"username": user.username,
		"type": ["Student", "Instructor", "Observer"][user.utype - 1],
		"admin": user.admin,
		"registertime": datetime.datetime.fromtimestamp(user.registertime).isoformat() + "Z",
		"me": me,
		"show_email": show_email,
		"in_team": user_in_team
	}
	if show_email:
		userdata["email"] = user.email
	if user_in_team:
		userdata["team"] = team.get_team_info(tid=user.tid)
	return { "success": 1, "user": userdata }

##################
# USER FUNCTIONS #
##################

__check_username = lambda username: get_user(username_lower=username.lower()).first() is None
__check_email = lambda email: get_user(email=email.lower()).first() is None

UserSchema = Schema({
	Required("email"): check(
		([str, Length(min=4, max=128)], "Your email should be between 4 and 128 characters long."),
		([__check_email], "Someone already registered this email."),
		([utils.__check_email_format], "Please enter a legit email.")
	),
	Required("name"): check(
		([str, Length(min=4, max=128)], "Your name should be between 4 and 128 characters long.")
	),
	Required("username"): check(
		([str, Length(min=4, max=32)], "Your username should be between 4 and 32 characters long."),
		([utils.__check_alphanumeric], "Please only use alphanumeric characters in your username."),
		([__check_username], "This username is taken, did you forget your password?")
	),
	Required("password"): check(
		([str, Length(min=4, max=64)], "Your password should be between 4 and 64 characters long."),
		([utils.__check_ascii], "Please only use ASCII characters in your password."),
	),
	Required("type"): check(
		([str, lambda x: x.isdigit()], "Please use the online form.")
	),
	"notify": str
}, extra=True)

def get_user(username=None, username_lower=None, email=None, uid=None, reset_token=None):
	match = {}
	if username != None:
		match.update({ "username": username })
	elif username_lower != None:
		match.update({ "username_lower": username_lower })
	elif uid != None:
		match.update({ "uid": uid })
	elif email != None:
		match.update({ "email": email })
	elif is_logged_in():
		match.update({ "username": session["username"] })
	elif reset_token != None:
		match.update({ "reset_token": reset_token })
	with app.app_context():
		result = Users.query.filter_by(**match)
		return result

def login_user(username, password):
	user = get_user(username_lower=username.lower()).first()
	if user is None: return False
	correct = utils.check_password(user.password, password)
	if not correct: return False

	useragent = request.headers.get("User-Agent")
	ip = request.remote_addr

	with app.app_context():
		expired = LoginTokens.query.filter_by(username=username).all()
		for expired_token in expired: db.session.delete(expired_token)

		token = LoginTokens(user.uid, user.username, ua=useragent, ip=ip)
		db.session.add(token)
		db.session.commit()

		session["sid"] = token.sid
		session["username"] = token.username
		session["admin"] = user.admin == True
		if user.tid is not None and user.tid >= 0:
			session["tid"] = user.tid

	return True

def in_team(user):
	return user.tid is not None and user.tid >= 0

def is_logged_in():
	if not("sid" in session and "username" in session): return False
	sid = session["sid"]
	username = session["username"]
	token = LoginTokens.query.filter_by(sid=sid).first()
	if token is None: return False

	useragent = request.headers.get("User-Agent")
	ip = request.remote_addr

	if token.username != username: return False
	if token.ua != useragent: return False
	return True

def is_admin():
	return is_logged_in() and "admin" in session and session["admin"]

def validate_captcha(form):
	if "captcha_response" not in form:
		return False
	captcha_response = form["captcha_response"]
	data = {"secret": "6Lc4xhMTAAAAACFaG2NyuKoMdZQtSa_1LI76BCEu", "response": captcha_response}
	response = requests.post("https://www.google.com/recaptcha/api/siteverify", data=data)
	return response.json()["success"]