Python3 Outlook SMPT Email Example

Posted by Matt Wakeling in Friday, 28 July 2023

Python3 Outlook SMPT Email Example using SMTPLIB
Populate Ecrypted Constants from Environment Variables Code and Cryptography 


import os
import smtplib
from email.message import EmailMessage
from cryptography.fernet import Fernet
from dotenv import load_dotenv

# Load environment variables from the .env file
def initialize():
    load_dotenv()

    # Get the decryption key and encrypted password from environment variables
    DECRYPTION_KEY = bytes(os.getenv("DECRYPTION_KEY"), encoding='utf-8')
    ENCRYPTED_PASSWORD = bytes(os.getenv("ENCRYPTED_PASSWORD"), encoding='utf-8')

    # Initialize the Fernet cipher suite with the decryption key
    cipher_suite = Fernet(DECRYPTION_KEY)
    # Decrypt the encrypted password
    decrypted_password = cipher_suite.decrypt(ENCRYPTED_PASSWORD).decode()
    # Get the email sender from environment variables
    email_sender = os.getenv("EMAIL_SENDER")

    return email_sender, decrypted_password

# Main function to send an email
def main():
    # Initialize email sender and decrypted password
    email_sender, decrypted_password = initialize()

    # Define the email recipient
    email_recipient = "john.doe@example.com"

    # Define the HTML email message
    email_message = """
    <html>
        <body>
            <h1>Hello world!</h1>
            <p>This is a test email sent from Python.</p>
            <p>Regards,</p>
            <p>Python Learner</p>
        </body>
    </html>
    """
    email = EmailMessage()
    # Set the email sender
    email["From"] = email_sender
    # Set the email recipient
    email["To"] = email_recipient
    # Set the email subject
    email["Subject"] = "Test Email 4"

    # Set the content type to "text/html"
    email.add_alternative(email_message, subtype='html')

    # Connect to the SMTP server
    email_smtp = smtplib.SMTP("smtp-mail.outlook.com", port=587)
    # Start TLS encryption
    email_smtp.starttls()
    # Login to the email server using the sender's email and decrypted password
    email_smtp.login(email_sender, decrypted_password)
    # Send the email
    email_smtp.sendmail(email_sender, email_recipient, email.as_string())
    # Quit the SMTP server
    email_smtp.quit()

if __name__ == "__main__":
    main()

.env Environment Variables File 

# .env
DECRYPTION_KEY="G5YLK1KdKpQZjT5p30Chd9SJ2KVc9e_7qeQ1EDufPHU="
ENCRYPTED_PASSWORD="gAAAAABkw6rzPNKDivFJgvBMkY_07i2MI0ZOmXMw-oJgTPXzLS8p7SmJ6O7uDiL652s8AjHc5kEoL6KX3Wy-gp4cSgfdsted3g=="
EMAIL_SENDER="jane.doe@example.com

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Python3 Environment Variables Example

Posted by Matt Wakeling

Python3 Environment Variables Example using DOTENV Package
Populate Constants from Environment Variables Code 


# constants.py
import os
from cryptography.fernet import Fernet
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

# Retrieve the decryption key and encrypted password from environment variables
DECRYPTION_KEY = bytes(os.getenv("DECRYPTION_KEY"), encoding='utf-8')
ENCRYPTED_PASSWORD = bytes(os.getenv("ENCRYPTED_PASSWORD"), encoding='utf-8')

# Create a cipher suite using the decryption key
cipher_suite = Fernet(DECRYPTION_KEY)

# Decrypt the password using the cipher suite and convert it to a string
password = cipher_suite.decrypt(ENCRYPTED_PASSWORD).decode()

# Print the decrypted password
print("Password: ", password)

.env Environment Variables File 

# .env
DECRYPTION_KEY="G5YLK1KdKpQZjT5p30Chd9SJ2KVc9e_7qeQ1EDufPHU="
ENCRYPTED_PASSWORD="gAAAAABkw6rzPNKDivFJgvBMkY_07i2MI0ZOmXMw-oJgTPXzLS8p7SmJ6O7uDiL652s8AjHc5kEoL6KX3Wy-gp4cSgfdsted3g=="

Example Output 

Decrypted password: Pa$$w0rd123!

Process finished with exit code 0

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Python3 Encryption / Decryption Example

Posted by Matt Wakeling

Python3 Encrytion / Decryption Example using Cryptography Package
Encryption / Decryption Code 


from cryptography.fernet import Fernet

def generate_key():
    """
    Generate a new encryption key.
    """
    return Fernet.generate_key()

def encrypt_password(password, key):
    """
    Encrypt the given password using the provided key.

    Parameters:
        password (str): The password to be encrypted.
        key (bytes): The encryption key.

    Returns:
        bytes: The encrypted password.
    """
    cipher_suite = Fernet(key)
    encrypted_password = cipher_suite.encrypt(password.encode())
    return encrypted_password

def decrypt_password(encrypted_password, key):
    """
    Decrypt the given encrypted password using the provided key.

    Parameters:
        encrypted_password (bytes): The encrypted password.
        key (bytes): The encryption key.

    Returns:
        str: The decrypted password.
    """
    cipher_suite = Fernet(key)
    decrypted_password = cipher_suite.decrypt(encrypted_password).decode()
    return decrypted_password

def main():
    """
    Main function to run the password encryption and decryption process.
    """
    # Generate the encryption key
    key = generate_key()

    # Get the plain text password from the user
    plain_text_password = input("Enter the password to encrypt: ")

    # Encrypt the password
    encrypted_password = encrypt_password(plain_text_password, key)
    print("Key:               ", key)
    print("Encrypted password:", encrypted_password)

    # Decrypt the password
    decrypted_password = decrypt_password(encrypted_password, key)
    print("Decrypted password:", decrypted_password)

if __name__ == "__main__":
    main()

Example Output 

Enter the password to encrypt: Pa$$w0rd123!
Key:                b'G5YLK1KdKpQZjT5p30Chd9SJ2KVc9e_7qeQ1EDufPHU='
Encrypted password: b'gAAAAABkw6rzPNKDivFJgvBMkY_07i2MI0ZOmXMw-oJgTPXzLS8p7SmJ6O7uDiL652s8AjHc5kEoL6KX3Wy-gp4cSgfdsted3g=='
Decrypted password: Pa$$w0rd123!

Process finished with exit code 0

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Python3 OpenVPN (NORD)

Posted by Matt Wakeling in Thursday, 27 July 2023

Python3 script to open a NORD VPN connection using OpenVPN, run some custom code when connection succeeded and close the VPN connection when complete.

Prerequisties

  • OpenVPN (Version 2.6.010)
  • NORD VPN Configuration (https://nordvpn.com/servers/tools/)
  • NORD Service Credentials
  • Elevation Required, run script as administrator.


NORDCredentials.txt

Service Username
Service Password


NORDVPN.py

# Script ran as Administrator.

import subprocess
import threading
import time
from datetime import datetime


def monitor_process_output(process, target_string, stop_event):
    """
    Monitors the output of the subprocess and sets the stop_event when the target string is found.
    :param process: The subprocess to monitor.
    :param target_string: The string to look for in the subprocess output.
    :param stop_event: The threading.Event object to signal the main thread to stop waiting.
    """
    while process.poll() is None:
        output = process.stdout.readline()
        print(output, end="")
        if target_string in output:
            stop_event.set()  # Set the event to signal the main thread to stop waiting
            break


def start_vpn():
    """
    Starts the VPN process and creates a thread to monitor its output.
    :return: The output_monitor_thread and the subprocess object.
    """
    target_string = "Initialization Sequence Completed"  # Replace this with the string you're looking for
    config_file_path = r"C:\PROGRA~1\OpenVPN\config\uk2394.nordvpn.com.tcp.ovpn"
    cmd = r"C:\PROGRA~1\OpenVPN\bin\openvpn.exe --config " + config_file_path + " --auth-user-pass NORDCredentials.txt"

    process = subprocess.Popen(
        cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        text=True,
        bufsize=1,
        universal_newlines=True
    )

    stop_event = threading.Event()
    output_monitor_thread = threading.Thread(target=monitor_process_output, args=(process, target_string, stop_event))
    output_monitor_thread.daemon = True
    output_monitor_thread.start()

    # Wait for the thread to finish, but also check for the stop_event to exit early
    while not stop_event.is_set():
        output_monitor_thread.join(timeout=0.1)  # Adjust the timeout value as needed

    return output_monitor_thread, process


def stop_vpn(output_monitor_thread, process):
    """
    Stops the VPN process and joins the monitoring thread.
    :param output_monitor_thread: The thread monitoring the subprocess output.
    :param process: The subprocess to terminate.
    """
    # Terminate the subprocess
    if process.poll() is None:
        print(datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " Stopping OpenVPN Process.")
        process.terminate()

    # Join the monitoring thread if it's still running
    if output_monitor_thread.is_alive():
        output_monitor_thread.join()


def main():
    """
    Main function to start and stop the VPN process.
    """
    output_monitor_thread, process = start_vpn()

    # <<<<<<<<<<<<<<< CODE HERE >>>>>>>>>>>>>>>
    print(datetime.now().strftime("%Y-%m-%d %H:%M:%S") + " <<<<<<<<<<<<<<< CODE HERE >>>>>>>>>>>>>>>")
    time.sleep(15)  # Placeholder for any other code execution. Adjust the sleep time as needed.

    stop_vpn(output_monitor_thread, process)


if __name__ == "__main__":
    main()

Example Output:

2023-07-27 22:08:25 DEPRECATED OPTION: --cipher set to 'AES-256-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM). OpenVPN ignores --cipher for cipher negotiations. 
2023-07-27 22:08:25 Note: '--allow-compression' is not set to 'no', disabling data channel offload.
2023-07-27 22:08:25 OpenVPN 2.6.0 [git:v2.6.0/b999466418dddb89] Windows-MSVC [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] [DCO] built on Feb 15 2023
2023-07-27 22:08:25 Windows version 10.0 (Windows 10 or greater), amd64 executable
2023-07-27 22:08:25 library versions: OpenSSL 3.0.8 7 Feb 2023, LZO 2.10
2023-07-27 22:08:25 WARNING: --ping should normally be used with --ping-restart or --ping-exit
2023-07-27 22:08:25 NOTE: --fast-io is disabled since we are running on Windows
2023-07-27 22:08:25 Outgoing Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
2023-07-27 22:08:25 Incoming Control Channel Authentication: Using 512 bit message hash 'SHA512' for HMAC authentication
2023-07-27 22:08:25 TCP/UDP: Preserving recently used remote address: [AF_INET]103.214.45.102:443
2023-07-27 22:08:25 Socket Buffers: R=[65536->65536] S=[65536->65536]
2023-07-27 22:08:25 Attempting to establish TCP connection with [AF_INET]xxx.xxx.xxx.xxx:443
2023-07-27 22:08:25 TCP connection established with [AF_INET]xxx.xxx.xxx.xxx:443
2023-07-27 22:08:25 TCPv4_CLIENT link local: (not bound)
2023-07-27 22:08:25 TCPv4_CLIENT link remote: [AF_INET]xxx.xxx.xxx.xxx:443
2023-07-27 22:08:25 TLS: Initial packet from [AF_INET]xxx.xxx.xxx.xxx:443, sid=1eb1bab9 2c508898
2023-07-27 22:08:25 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
2023-07-27 22:08:25 VERIFY OK: depth=2, C=PA, O=NordVPN, CN=NordVPN Root CA
2023-07-27 22:08:25 VERIFY OK: depth=1, O=NordVPN, CN=NordVPN CA8
2023-07-27 22:08:25 VERIFY KU OK
2023-07-27 22:08:25 Validating certificate extended key usage
2023-07-27 22:08:25 ++ Certificate has EKU (str) TLS Web Server Authentication, expects TLS Web Server Authentication
2023-07-27 22:08:25 VERIFY EKU OK
2023-07-27 22:08:25 VERIFY X509NAME OK: CN=uk2392.nordvpn.com
2023-07-27 22:08:25 VERIFY OK: depth=0, CN=uk2392.nordvpn.com
2023-07-27 22:08:25 Control Channel: TLSv1.3, cipher TLSv1.3 TLS_AES_256_GCM_SHA384, peer certificate: 4096 bit RSA, signature: RSA-SHA512
2023-07-27 22:08:25 [uk2392.nordvpn.com] Peer Connection Initiated with [AF_INET]xxx.xxx.xxx.xxx:443
2023-07-27 22:08:25 TLS: move_session: dest=TM_ACTIVE src=TM_INITIAL reinit_src=1
2023-07-27 22:08:25 TLS: tls_multi_process: initial untrusted session promoted to trusted
2023-07-27 22:08:26 SENT CONTROL [uk2392.nordvpn.com]: 'PUSH_REQUEST' (status=1)
2023-07-27 22:08:26 PUSH: Received control message: 'PUSH_REPLY,redirect-gateway def1,dhcp-option DNS xxx.xxx.xxx.xxx,dhcp-option DNS xxx.xxx.xxx.xxx,explicit-exit-notify,comp-lzo no,route-gateway xxx.xxx.xxx.xxx,topology subnet,ping 60,ping-restart 180,ifconfig xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx,peer-id 0,cipher AES-256-GCM'
2023-07-27 22:08:26 OPTIONS IMPORT: timers and/or timeouts modified
2023-07-27 22:08:26 OPTIONS IMPORT: --explicit-exit-notify can only be used with --proto udp
2023-07-27 22:08:26 OPTIONS IMPORT: compression parms modified
2023-07-27 22:08:26 OPTIONS IMPORT: --ifconfig/up options modified
2023-07-27 22:08:26 OPTIONS IMPORT: route options modified
2023-07-27 22:08:26 OPTIONS IMPORT: route-related options modified
2023-07-27 22:08:26 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
2023-07-27 22:08:26 OPTIONS IMPORT: peer-id set
2023-07-27 22:08:26 OPTIONS IMPORT: data channel crypto options modified
2023-07-27 22:08:26 interactive service msg_channel=0
2023-07-27 22:08:26 open_tun
2023-07-27 22:08:26 tap-windows6 device [OpenVPN TAP-Windows6] opened
2023-07-27 22:08:26 TAP-Windows Driver Version 9.24 
2023-07-27 22:08:26 Set TAP-Windows TUN subnet mode network/local/netmask = xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx [SUCCEEDED]
2023-07-27 22:08:26 Notified TAP-Windows driver to set a DHCP IP/netmask of xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx on interface {xxxxxxxxxx} [DHCP-serv: xxx.xxx.xxx.xxx, lease-time: 31536000]
2023-07-27 22:08:26 Successful ARP Flush on interface [25] {xxxxxxxxxx}
2023-07-27 22:08:26 IPv4 MTU set to 1500 on interface 25 using SetIpInterfaceEntry()
2023-07-27 22:08:26 Block_DNS: WFP engine opened
2023-07-27 22:08:26 Block_DNS: Using existing sublayer
2023-07-27 22:08:26 Block_DNS: Added permit filters for exe_path
2023-07-27 22:08:26 Block_DNS: Added block filters for all interfaces
2023-07-27 22:08:26 Block_DNS: Added permit filters for TAP interface
2023-07-27 22:08:26 Data Channel: using negotiated cipher 'AES-256-GCM'
2023-07-27 22:08:26 Outgoing Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
2023-07-27 22:08:26 Incoming Data Channel: Cipher 'AES-256-GCM' initialized with 256 bit key
2023-07-27 22:08:31 TEST ROUTES: 1/1 succeeded len=0 ret=1 a=0 u/d=up
2023-07-27 22:08:31 C:\Windows\system32\route.exe ADD xxx.xxx.xxx.xxx MASK xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
2023-07-27 22:08:31 Route addition via ipapi [adaptive] failed because route exists
2023-07-27 22:08:31 C:\Windows\system32\route.exe ADD xxx.xxx.xxx.xxx MASK xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
2023-07-27 22:08:31 Route addition via ipapi [adaptive] failed because route exists
2023-07-27 22:08:31 C:\Windows\system32\route.exe ADD xxx.xxx.xxx.xxx MASK xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
2023-07-27 22:08:31 Route addition via ipapi [adaptive] failed because route exists
2023-07-27 22:08:31 Initialization Sequence Completed
2023-07-27 22:08:31 <<<<<<<<<<<<<<< CODE HERE >>>>>>>>>>>>>>>
2023-07-27 22:08:46 Stopping OpenVPN Process.

Process finished with exit code 0

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