1. I believe that you want a PrintWriter or add \n to the end of
the passwords (the user presses enter when running passwd). This is
probably causing your symptom of nothing happening (passwd waiting for you,
you waiting for passwd).
2. Only some users (maybe just root) can change other user's
passwords. You will need to run Tomcat as root, which introduces its own
set of security issues.
Randy
> -----Original Message-----
> From: Al-Qalb el-Mounir [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 14, 2002 1:53 PM
> To: Tomcat Users List
> Subject: changing a user's password on linux using jsp exec.
>
>
> Is it possible? I wrote this jsp file, but nothing
> seems to happen. Any ideas?
>
> ================== Code ===========
> <%@ page import="java.io.DataInputStream"%>
> <%@ page import="java.io.DataOutputStream"%>
>
> <%@ page import="java.io.BufferedWriter"%>
> <%@ page import="java.io.FileWriter"%>
> <%@ page import="java.io.IOException"%>
>
>
>
> <%
>
> String username = "TestUserId";
>
> String old_p_word = "oldPassword";
>
> String new_p_word = "newPassword";
>
> Process proc = null;
>
>
> Runtime thisRun = Runtime.getRuntime();
>
> String cmd = "passwd " + username;
>
> proc = thisRun.exec(cmd);
>
>
> //Returns a Stream connected to the output of the
> child process.
>
> DataInputStream inputstream = new
> DataInputStream(proc.getInputStream());
> //Reads output from process
>
> String procOutputline = inputstream.readLine();
>
> if (procOutputline != null)
> {
> out.println("Process output: " +
> procOutputline);
> }
>
> //Returns a Stream connected to the input of the child
> process.
> //we assume user exists and that the process will ask
> for the old password first.
>
> DataOutputStream outputstream = new
> DataOutputStream(proc.getOutputStream());
> outputstream.writeBytes(old_p_word);
>
>
> //read output from process. We assume that the process
> will ask for the new password
> procOutputline = inputstream.readLine();
>
> if (procOutputline != null)
> {
> out.println("Process output: " +
> procOutputline);
> }
>
> //send value of new password to the process.
> outputstream.writeBytes(new_p_word);
>
>
> //Process should ask us to confirm the new password
> //Returns a Stream connected to the output of the
> child process.
>
> procOutputline = inputstream.readLine();
>
> if (procOutputline != null)
> {
> out.println("Process output: " +
> procOutputline);
> }
>
> //confirm the new password to the process.
> outputstream.writeBytes(new_p_word);
>
>
> //Waits for the subprocess to complete.
> proc.waitFor();
>
> //Returns the exit value for the subprocess.
> out.println("Process existed with value: "
> +proc.exitValue());
>
> //Returns the an InputStream connected to the error
> stream of the child process.
> DataInputStream errorinputstream = new
> DataInputStream(proc.getErrorStream());
> String line = errorinputstream.readLine();
>
> if (line != null)
> {
> throw new Exception("There was a problem
> changing password for : " + username + " --" + line);
> }
>
> //out.println("The output string is
> "+proc.toString());
> proc.destroy();
>
>
> %>
>
> ================= End of code.
>
>
>
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