Web_App

app.py

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+from flask import Flask, render_template, request, url_for
+import sys
+import subprocess
+import re
+import os
+import tempfile
+
+# Initialize the Flask application
+app = Flask(__name__)
+
+# Define a route for the default URL, which loads the form
+@app.route('/')
+def form():
+    return render_template('form_submit.html')
+
+@app.route('/user', methods=['POST'])
+def user():
+#get the form data
+    username=request.form['username']
+    shell=request.form['shell']
+    homedir=request.form['homedir']
+    passwd=request.form['password']
+    sudo=request.form['sudo']
+    action=request.form['dropdown']
+
+# check if user is already exist or not
+    userExist=isUserExist(request.form['username'])
+
+# take the action
+    if action == "Create":
+        if userExist: #if user already exist nothing to do
+            msg1="User " + str(username) + " already exist!"
+        else: #add requested user
+            returnCode=addUser(username,shell,homedir,passwd)
+            if returnCode:
+                msg1="User " + str(username) + " added!"
+            else:
+                msg1="User " + str(username) + " doesn't added!"
+
+    elif action == "Modify":
+        if userExist: # modify the user if exist
+            returnCode=modUser(username,shell,homedir,passwd)
+            if returnCode:
+                msg1="User " + str(username) + " modified!"
+            else:
+                msg1="User " + str(username) + " doesn't modified!"
+        else:
+            msg1="User " + str(username) + " doesn't exist!"
+
+    elif action == "Delete":
+        if userExist: # delete user if exist
+            returnCode=delUser(username)
+            if returnCode:
+                msg1="User " + str(username) + " deleted!"
+            else:
+                msg1="User " + str(username) + " doesn't deleted!"
+        else:
+            msg1="User " + str(username) + " doesn't exist!"
+
+#now it's time for sudo
+    msg2=""
+    userExist=isUserExist(request.form['username']) # for sudo check if user exist
+    temp=tempfile.NamedTemporaryFile()
+    sudoersFile=temp.name
+    os.system("sudo cp /etc/sudoers " + temp.name) # normal user doesn't have permission to read and modify so first create a temp file for sudoers
+    sudo_entry= username + "\tALL=(ALL) ALL\n" # if sudo entry need to insert use it.
+    sudoer = open(sudoersFile, "r")
+    regex = re.compile(username + ".+=.+ALL")
+    for line in sudoer: #check if a sudo entry is exist of not
+        sudo_entryMatch = regex.findall(line)
+        if sudo_entryMatch: # if sudo entry found exit the loop
+            break
+    sudoer.close
+    if action == "Create" and sudo == "Yes" and userExist:
+        if sudo_entryMatch: #if sudo entry found then no need to add it
+            msg2="sudo entry Found: " + str(sudo_entryMatch)
+        else: #else if sudo entry not found then add it
+            msg2="Sudo entry Not Found, adding entry: " + sudo_entry 
+            add_sudo(sudo_entry,sudoersFile)
+            os.system("sudo cp " + temp.name +" /etc/sudoers")
+
+    elif action == "Modify" and userExist:
+        if sudo_entryMatch and sudo == "No": # if sudo entry found but selected NO for sudo then delete it.
+            msg2="sudo entry Found, deleting: " + str(sudo_entryMatch)
+            del_sudo(regex,sudo_entryMatch,sudoersFile)
+            os.system("sudo cp " + temp.name +" /etc/sudoers")
+        elif not sudo_entryMatch and sudo == "Yes":
+            msg2="Sudo entry Not Found, adding entry: " + sudo_entry 
+            add_sudo(sudo_entry,sudoersFile)
+            os.system("sudo cp " + temp.name +" /etc/sudoers")
+        elif sudo_entryMatch and sudo == "Yes":
+            msg2="Sudo entry Found" 
+        elif not sudo_entryMatch and sudo == "No":
+            msg2="Sudo not required" 
+
+    elif action == "Delete" and userExist:
+        if sudo_entryMatch: # if action is user delete then delete sudo entry 
+            msg2="sudo entry Found, deleting: " + str(sudo_entryMatch)
+            del_sudo(regex,sudo_entryMatch,sudoersFile)
+            os.system("sudo cp " + temp.name +" /etc/sudoers")
+        else:
+            msg2="nothing for sudo entry"
+
+    temp.close() 
+
+    return render_template('form_action.html', message1=msg1, message2=msg2, username=username)
+
+def command(cmd): # method to execute the system commands
+    p = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
+    out,err = p.communicate()
+    if p.returncode == 0:
+        return True
+    else:
+        return False
+
+def passencrypt(cmd): # encrypt the password 
+    p = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
+    out,err = p.communicate()
+    return out 
+
+def isUserExist(user): # check if user is exist or not
+    cmd = ["id", user]
+    rcode=command(cmd)
+    print rcode
+    return rcode
+
+def addUser(username,shell,homedir,passwd): # add a system user using system commands
+    passoutput=passencrypt(["/usr/bin/sudo", "/usr/bin/openssl", "passwd", "-crypt", str(passwd)])
+    returnCode=command(["/usr/bin/sudo", "/usr/sbin/useradd", "-m", "-d", str(homedir), "-s", str(shell), "-p", str(passoutput.strip()), username])
+    print username,shell,homedir,passwd
+    return returnCode
+
+def modUser(username,shell,homedir,passwd): # modify a system user using system commands
+    passoutput=passencrypt(["/usr/bin/sudo", "/usr/bin/openssl", "passwd", "-crypt", str(passwd)])
+    returnCode=command(["/usr/bin/sudo", "/usr/sbin/usermod", "-d", str(homedir), "-s", str(shell), "-p", str(passoutput.strip()), username])
+    print username,shell,homedir,passwd
+    return returnCode
+
+def delUser(username): # delete user
+    returnCode=command(["/usr/bin/sudo", "/usr/sbin/userdel", "-r", username])
+    return returnCode
+
+def add_sudo(sudo_entry,sudoersFile): # add sudo entry
+    sudoer = open(sudoersFile, "a")
+    sudoer.write(sudo_entry)
+    sudoer.close()
+
+def del_sudo(regex,sudo_entryMatch,sudoersFile): # delete sudo entry 
+    sudoer = open(sudoersFile, "r")
+    lines = sudoer.readlines()
+    sudoer.close()
+    sudoer = open(sudoersFile, "w")
+    matchLine=sudo_entryMatch[0] + "\n"
+    for line in lines:
+        if line != matchLine:
+            sudoer.write(line)
+    sudoer.close()
+
+
+# Run the app :)
+if __name__ == '__main__':
+    app.run 
+

static/style.css

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+::selection{ background-color: #E13300; color: white; }
+::moz-selection{ background-color: #E13300; color: white; }
+::webkit-selection{ background-color: #E13300; color: white; }
+
+body {
+    font-family: "Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;
+    color: #888;
+    font-style: normal;
+    font-size: 14px;
+    line-height: 22px;
+}
+
+a {
+    color: #003399;
+    background-color: transparent;
+    font-weight: normal;
+}
+
+.title {
+    padding: 0 20px;
+    background: #32373a;
+    position: relative;
+    height: 50px;
+}
+
+h1 {
+    color: #fff;
+    margin: 0;
+    font-size: 18px;
+    font-weight: 400;
+    line-height: 50px;
+    text-transform: capitalize;
+}
+
+code {
+    font-family: Consolas, Monaco, Courier New, Courier, monospace;
+    font-size: 12px;
+    background-color: #f9f9f9;
+    border: 1px solid #D0D0D0;
+    color: #002166;
+    display: block;
+    padding: 12px 10px 12px 10px;
+}
+
+#content {
+    padding: 20px;
+    zoom: 1;
+}
+
+#body{
+    margin: 0 15px 0 15px;
+}
+
+p.footer{
+    text-align: right;
+    font-size: 11px;
+    border-top: 1px solid #D0D0D0;
+    line-height: 32px;
+    padding: 0 10px 0 10px;
+    margin: 20px 0 0 0;
+}
+
+#container{
+    margin: 10px;
+    border: 1px solid #D0D0D0;
+    -webkit-box-shadow: 0 0 8px #D0D0D0;
+}
+
+/* Form Styles */
+form label{
+/*    display: block;*/
+    display: inline;
+    margin-bottom: 5px;
+}
+form input[type=text]{
+    border: 1px solid #aaa;
+    border-radius: 2px;
+    box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
+    box-sizing: border-box;
+    padding: 5px;
+    margin-bottom: 20px;
+    outline: 0;
+    -webkit-border-radius: 2px;
+    -moz-border-radius: 2px;
+    -webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
+    -moz-box-shadow: inset 0 1px 2px rgba(0,0,0,.1);
+}
+form input[type=submit]{
+    background: #198ad1;
+    color: #fff;
+    display: inline-block;
+    padding: 0 20px;
+    font-size: 16px;
+    line-height: 2.6em;
+    font-family: "Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif;
+    font-weight: 400;
+    -webkit-box-shadow: inset 0 -1px 0 rgba(0,0,0,.1);
+    -moz-box-shadow: inset 0 -1px 0 rgba(0,0,0,.1);
+    box-shadow: inset 0 -1px 0 rgba(0,0,0,.1);
+    -webkit-border-radius: 2px;
+    -moz-border-radius: 2px;
+    border-radius: 2px;
+    text-transform: capitalize;
+    border: 0;
+    cursor: pointer;
+    text-align: center;
+} 

templates/form_action.html

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+ <html>
+    <head>
+        <title>Handle POST requests with Flask</title>
+        <link rel=stylesheet type=text/css href="{{ url_for('static', filename='style.css') }}">
+    </head>
+    <body>
+        <div id="container">
+            <div class="title">
+                <h1>POST request with Flask</h1>
+            </div>
+            <div id="content">
+                <strong>{{message1}}</strong>
+				<br />
+                <strong>{{message2}}</strong>
+            </div>
+        </div>
+    </body>
+</html>
+

templates/form_submit.html

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+<html>
+    <head>
+        <title>Linux User Management</title>
+        <link rel=stylesheet type=text/css href="{{ url_for('static', filename='style.css') }}">
+    </head>
+    <body>
+        <div id="container">
+            <div class="title">
+                <h1>Linux User Management with Flask</h1>
+            </div>
+            <div id="content">
+                <form method="post" action="{{ url_for('user') }}">
+                  <label for="username">User Name:</label>
+                  <input type="text" name="username" /><br />
+                  <label for="shell">Shell:</label>
+                  <input type="text" name="shell" /><br />
+                  <label for="homedir">Home Dir:</label>
+                  <input type="text" name="homedir" /><br />
+                  <label for="password">Password:</label>
+                  <input type="text" name="password" /><br />
+                  <label for="sudo">SUDO:</label>
+                  <select name="sudo">Sudo:
+                  <option value="Yes" selected>Yes</option>
+				  <option value="No"> No</option>
+				  </select><br />
+                  <label for="action">Action:</label>
+				  <select name="dropdown">
+				  <option value="Create" selected>Create</option>
+				  <option value="Modify"> Modify</option>
+				  <option value="Delete"> Delete</option>
+				  </select><br /><br />
+                  <input type="submit" /><br />
+                </form>
+            </div>
+        </div>
+    </body>
+</html>