Google CTF 2019
Drive to target
Excellent work! With your fine sleuthing skills, you managed to find a picture of the handsome creature with its pet biped. At last friends and companionship may be near! Like all inhabitants of this world, you spend an inordinate amount of time on the site, stalking and comparing your life to that of others. The first thought that springs to your mind is “Why haven’t I ever been to Mauritius on holiday?” followed swiftly by “What is a Mauritius anyway?” But after a while and with language successfully deciphered, you’ve made contact with the lifeform in the picture, you have a “date”? You’re given the address of where to meet your potential interest. “1 Banana way, beware of the glass.” An odd address, especially that last part. So how do you get there? You land your ship and begin to search.
https://drivetothetarget.web.ctfcompetition.com/
You can find my all CTF solution in here
Website;
When I try to picking different condition I saw the returned message. So I try to different option than I saw the 4 different option
These are conditions. So we must write to code manage these condition. First we must to be understand idea. First we find the direction. So that we must to calculate direction angle. These are the first step. After that code try to find optimal speed. Program must be increase the speed until gettin too fast error. I shar the code. If you have question about the calculating angle or anthing else. Please contact to me.
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#!/usr/bin/env python3.6 import math import re import time import requests from bs4 import BeautifulSoup class Car: def __init__ (self): self.response = request(init=True) self.lat = self.response.lat self.lon = self.response.lon self.token = self.response.token self.angle = 0 self.steps_counter = 0 self.calculate_angle() self.step_size = 0.0001 def drive(self): self.step() while not self.response.done(): while self.response.closer(): self.print() time.sleep(1) if self.response.speed() < 48: self.step_size *= 1.001 if self.steps_counter > 400: self.calculate_angle() else: self.steps_counter += 1 self.step() if self.response.away(): self.print() self.calculate_angle() self.step_size = 0.0001 self.step() elif self.response.fast(): self.print() self.step_size *= 0.99 self.step() elif self.response.done(): self.print() return self.response self.print() #this is not neccesary dump def calculate_angle(self): print('Calculating Angle ', end='') last_status = None self.steps_counter = 0 for angle in range(0,361,1): print('.',end='',flush=True) distance = move(angle,0.0001) response = request(self.lat + distance.y,self.lon + distance.x, self.token) while response.fast(): time.sleep(1) response = request(self.lat + distance.y,self.lon + distance.x, self.token) if response.done(): self.angle = angle print() return status = 'away' if response.away() else 'closer' if status == 'closer' and last_status == 'away': self.angle = angle +89 print() return else: last_status = status def print(self): print(f'{self.response.msg} \nlat: {self.response.lat:.15f} \nlon: {self.response.lon:.15f}' f' \nangle: {self.angle}° \nURL: {self.response.url}') def step(self): distance=move(self.angle,self.step_size) response = request(self.lat + distance.y,self.lon+distance.x,self.token) if response.closer(): self.lat = response.lat self.lon = response.lon self.token = response.token self.response = response class Distance: def __init__(self,x,y): self.x = x self.y = y class Responser: def __init__(self,msg,lat,lon,token,url): self.msg = msg self.lat = lat self.lon = lon self.token = token self.url = url def closer(self): return 'getting closer' in self.msg def away(self): return 'getting away' in self.msg def fast(self): return 'too fast' in self.msg def notmove(self): return 'you should move' in self.msg def speed(self): return int(re.findall('\\b(\\d+)km/h',self.msg)[0]) def url(self): return self.url def done(self): return not (self.closer() or self.away() or self.fast() or self.notmove()) def move(angle,distance): rad = math.radians(angle) dx = math.sin(rad)*distance dy = math.cos(rad)*distance return Distance(dx,dy) def request(lat=None, lon=None, token=None, init=False): if init: link = 'https://drivetothetarget.web.ctfcompetition.com/' else: link = f'https://drivetothetarget.web.ctfcompetition.com/?lat={lat}&lon={lon}&token={token}' soup = BeautifulSoup(requests.get(link).text,'html.parser') msg = soup.find_all('p')[-1].get_text() new_lat = float(soup.find('input', {'name': 'lat'}).get('value')) new_lon = float(soup.find('input', {'name': 'lon'}).get('value')) new_token = soup.find('input', {'name': 'token'}).get('value') return Responser(msg, new_lat, new_lon, new_token,link) if __name__ == '__main__': car = Car() car.drive() |
Sample output of the program:
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./car.py Calculating Angle ............................................................................................................................... You went 9m at a speed of 0km/h. You are getting closer… lat: 51.649718084795573 lon: 0.098142642356365 angle: 215° URL: https://drivetothetarget.web.ctfcompetition.com/?lat=51.64971808479557&lon=0.09814264235636488&token=gAAAAABdInPilUgkQz6REctDFNUxJrobuZVR0-8Q9FxJ_slYth_hZ7athseH7eSX3yW0q0f813XadvtTP2kAmfkqlatHbvsjOyb9Ifj7LGXuRQtl1_KxF9az0yBeEQyuSrAfVY7B9SNK You went 9m at a speed of 21km/h. You are getting closer… lat: 51.649636087675937 lon: 0.098085227355086 angle: 215° URL: https://drivetothetarget.web.ctfcompetition.com/?lat=51.64963608767594&lon=0.09808522735508614&token=gAAAAABdInQ6jzbzv9igRb9xXPEIJ2nPODV8ARhhnikbn2tnk7sF6P28vdTP7WSXygqtw7wic6pyVxELiWorxYr5RcaSlG44uGKXM37K10wphVt7KmOL5jDew-RFjkx6n7f6JhIhboQI You went 9m at a speed of 23km/h. You are getting closer… lat: 51.649554008559186 lon: 0.098027754938806 angle: 215° URL: https://drivetothetarget.web.ctfcompetition.com/?lat=51.649554008559186&lon=0.09802775493880612&token=gAAAAABdInQ7_eYZpiGEFDyA_VI6kqB9WGCFHPAi-nDwUof4Y1it8QPuUn3lbA1ocY4b6cf1GmqJSfs8uWO8Zy1yVDSsJGTJZCG3Fjpt2bO6JP3ls4QuK3Gmc1e7YvxpjEIYkltMQc23 |
When program finish it gives the website url. When you click on this website you will see the flag.
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Congratulations, you made it, here is the flag: CTF{Who_is_Tardis_Ormandy} lat: 51.492141786931363 lon: -0.192798677264271 angle: 232° URL: https://drivetothetarget.web.ctfcompetition.com/?lat=51.49214178693136&lon=-0.19279867726427113&token=gAAAAABdIoJ6DwkT_AGqP6jMRiueRRJ7vwTcIr0qnwwqDGsBySqyRA4Gibc-3v4MXa4UPsDxm6S6Ulg6GtRPTwYPiWtYIhY7Ia1rR_KnpKOTVj3pCDjF4Mpby7qohdZ0DWCeLtd1VeTa |
CTF{Who_is_Tardis_Ormandy}