![]() ![]() -to-port 8080 redirect traffic to the mitmproxy listener.-j REDIRECT action taken if a rule is matches.-dport 443 destination port (default HTTPS).-s 10.10.10.1/24 source IP address range (VPN clients).-i ens4 specifies network interface name.-A PREROUTING append the rule to NAT’s PREROUTING.Sudo iptables -t nat -A PREROUTING -i ens4 -s 10.10.10.1/24 -dport 80 -j REDIRECT -to-port 8080 sudo iptables -t nat -A PREROUTING -i ens4 -s 10.10.10.1/24 -dport 443 -j REDIRECT -to-port 8080 Save the file and restart the StrongSwan service with: config setupĬharondebug="ike 2, knl 2, cfg 2, net 2, esp 2, dmn 2, mgr 2" Make sure you update the lines leftcert=server.pem and leftid= to reflect your own settings. Here is an overview of the files we’ve created inside the /etc/ipsec.d folder: # tree /etc/ipsec.dĬopy the following /etc/nf configuration example, which has been tested and works on both iOS 15.4.1 and Android 10 (using the StrongSwan app). Openssl pkcs12 -export -in certs/test-device-1.pem -inkey private/test-device-1.pem -out certs/test-device-1.p12 To export certificates (from pem to crt), you can use openssl utility, type: These are required for server verification and authentication. p12 file that contains both the VPN server certificate and private key. flag clientAuth -outform pem > certs/test-device-1.pemīefore moving on to the next section, you may need to export certificates to client devices. cacert cacerts/ca.pem -cakey private/ca.pem -dn "C=GB, O=Red Maple Tech, CN=test-device-1" -san test-device-1 \ Ipsec pki -pub -in private/test-device-1.pem -type rsa | ipsec pki -issue -lifetime 3650 -digest sha256 \ Ipsec pki -gen -type rsa -size 2048 -outform pem > private/test-device-1.pem These will be installed on external devices, and also serve as the authentication method. Ipsec pki -issue -lifetime 730 -outform pem \ Ipsec pki -pub -in private/server.pem -type rsa | \ Ipsec pki -gen -type rsa -size 2048 -outform pem > private/server.pem Next, create a new server certificate and sign it with the root CA certificate: cd /etc/ipsec.d/ Change the -dn option to your own certificate details. The -lifetime means it’ll be valid for 10 years. dn "C=GB, O=Red Maple Tech, CN=Dev VPN MITM Root CA" \ Ipsec pki -self -ca -lifetime 3650 -outform pem \ Ipsec pki -gen -type rsa -size 4096 -outform pem > private/ca.pem ![]() Certificatesįirst, start off by creating a new self-signed root CA certificate: cd /etc/ipsec.d/ The main configuration file is located in /etc/nf. /etc/ipsec.d/private/ - all certificate private keys including clients, server, and the root CA./etc/ipsec.d/certs/ - server and client certificates (all signed by the root CA)./etc/ipsec.d/cacerts/ - root Certificate Authority (CA) certificate.All certificates and private key pairs will live inside the folder /etc/ipsec.d/: To do this, we can use the ipsec command-line utility. StrongSwan uses a Public Key Infrastructure (PKI), which requires us to generate several key pairs. In this set-up I will be using certificate-based authentication. First, install the required packages (package names may be different on other platforms): Prepare VPN profiles for client devices.Enable port forwarding and add rules with iptables.(Optional) replace the mitmproxy default certificates.Set up and configure the StrongSwan VPN server.You only need to do a one-time set-up that can be enabled/disabled by tapping a UI icon. Having a solution where a device connects to an always-on VPN server that also acts as a intercepting proxy, can be very useful and powerful for initial assessments. However, whilst it’s a great tool, the process of starting up a Burp Proxy listener and then manually changing device network settings can become very tedious. Why bother?įor any sort of mobile analysis, using network intercepting proxies like Burp Suite is quite common practice, especially for app testing. Mitmproxy contains optional web interface, where users can view and share exported logs. It is developed in Python and comes with a feature-rich library too. It provides researchers a simple way to inspect and modify encrypted network traffic such as, HTTP/1, HTTP/2, WebSockets, or any SSL/TLS-protected protocols. Mitmproxy is a man-in-the-middle tool that is used for proxying HTTPS traffic. At Red Maple we use it for our own hosted VPNs, including a monitored VPN service. It is supported by most modern OSes, such as Linux, Unix, Windows, macOS, and more. StrongSwan is an open-source IPsec/IKEv2 Virtual Private Network implementation that uses strong encryption standards and authentication methods. A how-to guide on setting up a StrongSwan IPSec (IKEv2) VPN server with mitmproxy to securely monitor and intercept HTTP/HTTPS network traffic, which aids mobile app analysis for both Apple and Android devices. ![]()
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