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| HTTP/1.1 200 OK
Date: Sun, 22 Nov 2020 02:33:49 GMT
Server: WSGIServer/0.2 CPython/3.5.2
Vary: Cookie
Content-Type: text/html; charset=utf-8
X-Frame-Options: SAMEORIGIN
Content-Length: 7786
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>åªæææè½ç¨çAESå¾çå å¯ç¨åº</title>
</head>
<body>
<h1>views.py</h1>
<code>
from django.shortcuts import render
from django.shortcuts import redirect
import hashlib
import string
import random
from . import models
from . import forms
from . import file_handle
def hash_code(s, salt='hellohacker'):
h = hashlib.sha256()
s += salt
h.update(s.encode())
return h.hexdigest()
# æªç»å½äººåï¼ä¸è®ºæ¯è®¿é®indexè¿æ¯loginålogoutï¼å
¨é¨è·³è½¬å°loginçé¢
# å·²ç»å½äººåï¼è®¿é®loginä¼èªå¨è·³è½¬å°index页é¢
# å·²ç»å½äººåï¼ä¸å
许ç´æ¥è®¿é®register页é¢ï¼éå
logout
# ç»åºåï¼èªå¨è·³è½¬å°loginçé¢
# Create your views here.
def index(request):
if not request.session.get('is_login', None):
return redirect('/login/')
user = request.session.get('user_name')
if not request.session.get('is_admin', None):
message_f = 'ä½ ä¸æ¯ç®¡çåï¼è¯·åæ管çå'
else:
message_s = '欢è¿ç»éï¼ç®¡çå'
return render(request, 'login/index.html', locals())
def login(request):
if request.session.get('is_login', None):
return redirect('/index/')
if request.method == "POST":
login_form = forms.UserForm(request.POST)
message = '请æ£æ¥å¡«åçå
容!'
if login_form.is_valid():
username = login_form.cleaned_data.get('username')
password = login_form.cleaned_data.get('password')
try:
user = models.User.objects.get(name=username)
except:
message = 'ç¨æ·ä¸åå¨'
return render(request, 'login/login.html', locals())
if user.password == hash_code(password):
request.session['is_login'] = True
request.session['user_id'] = user.id
request.session['user_name'] = user.name
request.session['secret'] = ''.join(random.sample(string.ascii_letters+string.digits, 16))
request.session['is_admin'] = False
return redirect('/index/')
else:
message = 'å¯ç ä¸æ£ç¡®'
return render(request, 'login/login.html', locals())
login_form = forms.UserForm()
return render(request, 'login/login.html', locals())
def register(request):
if request.session.get('is_login', None):
return redirect('/index/')
if request.method == 'POST':
register_form = forms.RegisterForm(request.POST)
message = "请æ£æ¥å¡«åçå
容"
if register_form.is_valid():
username = register_form.cleaned_data.get('username')
password = register_form.cleaned_data.get('password')
same_name_user = models.User.objects.filter(name=username)
if same_name_user:
message = 'ç¨æ·åå·²ç»åå¨'
return render(request, 'login/register.html', locals())
new_user = models.User()
new_user.name = username
new_user.password = hash_code(password)
new_user.save()
return redirect('/login/')
else:
return render(request, 'login/register.html', locals())
register_form = forms.RegisterForm()
return render(request, 'login/register.html', locals())
def logout(request):
if not request.session.get('is_login', None):
return redirect('/login/')
request.session.flush()
return redirect('/login/')
def upload_file(request):
if not request.session.get('is_login', None):
return redirect('/login/')
if not request.session.get('is_admin', None):
return render(request, 'login/admin.html')
if request.method == 'POST':
img = request.FILES.get('img', None)
if img.content_type != 'image/png' or img.size > 300000 or img._name.split('.')[1] != 'png':
message = 'åªå
许ä¸ä¼ png æ件ä¸æ件å°äº300kb'
return render(request, 'login/result.html', locals())
user = request.session.get('user_name')
key = request.session.get('secret')
file_handle.img_handle(img, key, user, img._name.split('.')[0])
message = 'success'
return render(request, 'login/result.html', locals())
else:
return render(request, 'login/upload.html', locals())
def show_source(request):
if not request.session.get('is_login', None):
return redirect('/login/')
if not request.session.get('is_admin', None):
return render(request, 'login/admin.html')
return render(request, 'login/code.html')
</code>
<h1>file_handle.py</h1>
<code>
from PIL import Image
from . import pic_encrypto
from challenge import settings
import os
import hashlib
def img_handle(f, key, name, i_name):
try:
img = Image.open(f)
except:
return False
h = hashlib.md5()
h.update((name+key).encode())
save_path = settings.MEDIA_ROOT + '/' + h.hexdigest()
if not os.path.exists(save_path):
os.makedirs(save_path.replace('\\', '/'))
print(save_path)
print(i_name)
h.update((i_name + key).encode())
print(h.hexdigest()+'.png')
pic_encrypto.encrypt(img, key.encode(), save_path, h.hexdigest()+'.png')
</code>
<h1>pic_encrypto.py</h1>
<code>
from Crypto.Cipher import AES
import binascii
from PIL import Image
def replace_all(text, dic):
for i, j in dic.items():
i = i.encode()
j = j.encode()
text = text.replace(i, j)
return text
def construct_enc_image(ciphertext, relength, width, height, save_path, i_name):
asciicipher = binascii.hexlify(ciphertext)
reps = {'a': '1', 'b': '2', 'c': '3', 'd': '4', 'e': '5', 'f': '6', 'g': '7', 'h': '8', 'i': '9', 'j': '10',
'k': '11', 'l': '12', 'm': '13', 'n': '14', 'o': '15', 'p': '16', 'q': '17', 'r': '18', 's': '19',
't': '20', 'u': '21', 'v': '22', 'w': '23', 'x': '24', 'y': '25', 'z': '26'}
asciiciphertxt = replace_all(asciicipher, reps)
step = 3
encimageone = [asciiciphertxt[i:i + step] for i in range(0, len(asciiciphertxt), step)]
if int(encimageone[len(encimageone) - 1]) < 100:
encimageone[len(encimageone) - 1] += b"1"
if len(encimageone) % 3 != 0:
while (len(encimageone) % 3 != 0):
encimageone.append(b"101")
encimagetwo = [(int(encimageone[int(i)]), int(encimageone[int(i + 1)]), int(encimageone[int(i + 2)])) for i in
range(0, len(encimageone), step)]
while (int(relength) != len(encimagetwo)):
encimagetwo.pop()
encim = Image.new("RGB", (int(width), int(height)))
encim.putdata(encimagetwo)
encim.save(save_path + '/' + i_name)
def encrypt(im, key, save_path, i_name):
plaintext = list()
plaintextstr = ""
pix = im.load()
width = im.size[0]
height = im.size[1]
for y in range(0, height):
for x in range(0, width):
plaintext.append(pix[x, y])
for i in range(0, len(plaintext)):
for j in range(0, 3):
aa = int(plaintext[i][j]) + 100
plaintextstr = plaintextstr + str(aa)
relength = len(plaintext)
plaintextstr = plaintextstr.encode()
plaintextstr += b"h" + bytes(height) + b"h" + b"w" + bytes(width) + b"w"
while (len(plaintextstr) % 16 != 0):
plaintextstr = plaintextstr + b"n"
key = key
try:
obj = AES.new(key, AES.MODE_CBC, b'aaaaaaaaaaaaaaaa')
except:
return False
ciphertext = obj.encrypt(plaintextstr)
# c = open("flag.crypto", 'wb')
# c.write(flag)
construct_enc_image(ciphertext, relength, width, height, save_path, i_name)
</code>
</body>
</html>
|
