Interesting, `www.auxbrain.com`. If we jump to its XREF, we get a garbled function, but what it seems to be doing is setting up
certain global values.
+## The smoke-test
+
So we have a potential API endpoint, let's put it to the test. We're not going to recompile anything yet or do any byte-patching,
let's try a quick smoke-test. Ensure your phone is rooted and you have a variant of Xposed Framework installed (I used LSPosed).
We will need to unarm the SSL pinning present in most apps, including this one, I used [io.github.tehcneko.sslunpinning](https://github.com/Xposed-Modules-Repo/io.github.tehcneko.sslunpinning) module.
-(Note: I know it is possible to repackage the app to do SSL unpinning in most cases, but in many cases, you won't know if it's worth the effort yet)
+(NOTE: Users without root might want to skip to end of article where I showcase unpinning the app manually)
Next, install [AdAway app from F-Droid](https://f-droid.org/packages/org.adaway/) so we can setup a redirection on any network we are on.
Inside AdAway, add a redirection rule for the address we just found and point it to an IP address in your LAN that will run the API server.
Generate a self-signed certificate authority and a certificate signed by it and run a webserver with both HTTP and HTTPS on the API server machine.
-Import the self-signed CA to your phone's truststore. Once all of that is done, run the app for first time.
+```
+# Create an ext file containing the Subject Alternative Name (SAN)
+# DNS.1 should correspond to the API endpoint of the app.
+# NOTE! If you are changing the API endpoint to a public domain, you can just use a public cert, no need for any of this.
+cat > auxbrain.ext << EOF
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = www.auxbrain.com
+EOF
+
+# Create your own Certificate Authority
+openssl genrsa -des3 -out myCA.key 2048
+openssl req -x509 -new -nodes -key myCA.key -sha256 -days 1825 -out myCA.pem
+# Create a CSR and lets have the new CA sign it
+openssl genrsa -out auxbrain.key 2048
+openssl req -new -key auxbrain.key -out auxbrain.csr -nodes
+openssl x509 -req -in auxbrain.csr -CA myCA.pem -CAkey myCA.key -CAcreateserial -out auxbrain.pem -days 825 -sha256 -extfile auxbrain.ext
+# You now have:
+# myCA.pem - the public certificate of your root CA
+# auxbrain.key - the private key for your webserver
+# auxbrain.pem - the public cert for your webserver.
+```
+
+Use the generated `auxbrain.pem` and `auxbrain.key` files for your webserver SSL/TLS configuration. For nginx, append following values to your server directive:
+```
+listen 443 ssl;
+ssl_certificate /path/to/auxbrain.pem;
+ssl_certificate_key /path/to/auxbrain.key;
+ssl_session_cache shared:SSL:1m;
+ssl_session_timeout 5m;
+ssl_ciphers HIGH:!aNULL:!MD5;
+ssl_prefer_server_ciphers on;
+```
+
+Import the self-signed CA (myCA.pem) to your phone's truststore (Check under your phone's Security/Encryption settings). Once all of that is done, run the app for first time.
```
192.168.1.212 - - [...] "POST /ei/first_contact HTTP/1.1" 404 0 "-"
python3 apk-rebuild.py egginc.apk --pause
```
+**NOTE!** IF you do not intend to patch the API endpoint and just want to proceed with AdAway redirecting traffic, you can stop here and press ENTER!
+Proceed only if you own a domain in your control (that is equal or less in length to www.auxbrain.com) and want to use the app without a VPN/redirection.
+
Open a new terminal window, the script will wait for us to perform modifications, enter the created folder `egginc.apk-decompiled` and `lib`.
We have two folders here now, `arm64-v8a` and `armeabi-v7a`, just as we saw when we pulled the .so file out of the apk earlier. Let's tackle
projects / web-hugo.git / blobdiff