Initial commit

.htaccess

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+RewriteEngine on
+RewriteCond %{HTTPS} !=on
+RewriteCond %{ENV:HTTPS} !=on
+RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L,NE]
+
+Options +ExecCGI
+AddHandler cgi-script .py
+DirectoryIndex index.py

LICENSE

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README.md

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+# VMailMgr chpw CGI
+
+This is a Python CGI script that lets virtual `VMailMgr`/`qmail` users change
+their own mail passwords via a web interface.
+
+This script is specifically tailored to work on hosts at
+[uberspace.de](https://uberspace.de). But it may also work on other qmail-based
+systems as long as virtual mail users are managed via `VMailMgr`.
+
+## Installation
+In order to make this script executable, you need to install `python-cdb` as
+it is a required dependency:
+
+    easy_install-2.7 python-cdb
+
+After that, simply extract all the repository contents into a folder under
+your document root. No paths need to be configured. Only make sure that the
+location is reachable via HTTPS.
+
+## Acknowledgements
+This is a majorly refined version of a script originally developed by Dirk Boye.
+See [dirkboye/mailpw_change](https://github.com/dirkboye/mailpw_change) at GitHub
+for the original source code.
+
+## FAQ
+* *Q:* Why still Python 2.7?<br>
+  *A:* We need `python-cdb` to parse the weird binary password database.
+  Unfortunately, `python-cdb` seems to be only available for Python 2.
+
+* *Q:* Can I use the script via unencrypted HTTP?<br>
+  *A:* No, HTTPS is hard-coded. So unless you change that in the code, you can't.
+  And honestly, you really shouldn't.
+
+* *Q:* Do I need to put the script in `/cgi-bin/`?<br>
+  *A:* In most cases, no. The script comes with an `.htaccess` that enables CGI
+  execution for the current directory. Generally, that should work. If not, your
+  administrator may have disabled option overriding in which case you actually
+  need to put it in `/cgi-bin/`. But in most cases (and especially on Uberspaces)
+  it should work just fine.
+
+* *Q:* I only get an error 500 and the log file says something about suEXEC
+  policy violation. How do I fix that?<br>
+  *A:* Make sure both the `index.py` as well as the containing directory have
+  the permissions `0755`. Any higher permissions will usually result in that error.

index.py

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+#!/usr/bin/env python2.7
+import cgi
+import cgitb
+import pwd, sys, os, cdb, subprocess
+from subprocess import check_output, Popen, PIPE
+from os.path import expanduser
+
+cgitb.enable()
+home_dir = expanduser("~")
+
+def check_form(formvars, form):
+    for varname in formvars:
+        if varname not in form.keys():
+            return False
+        else:
+            if type(form[varname].value) is not type(''):
+                return None
+    return True
+
+def read_template_file(filename, **vars):
+    with open('tpl/' + filename, 'r') as f:
+        template = f.read()
+    for key in vars:
+        template = template.replace('{$' + key + '}', vars[key])
+    return template
+
+def check_oldpw(accountname, oldpass):
+    passwd_dbfile = os.path.abspath(home_dir + "/passwd.cdb");
+    try:
+        db = cdb.init(passwd_dbfile)
+    except:
+        return 'No user database found.'
+    try:
+        cdb_user_data=db[accountname]
+    except:
+        return 'User not found or password incorrect.'
+    passhash = cdb_user_data[6:40]
+    # Hash algorithm is given between first two $ of passhash (here only md5 based BSD password is used)
+    hashtype = '1'
+    # Salt is given between next two $
+    salt = passhash[3:11]
+    opensslargs = ['openssl', 'passwd', '-' + hashtype, '-salt', salt, oldpass];
+    newhash = check_output(opensslargs).strip();
+    if newhash == passhash:
+        return ''
+    return 'User not found or password incorrect.'
+
+def generate_headers():
+    return "Content-Type: text/html; charset=utf-8\n"
+
+def main():
+    main_content = ''
+
+    form = cgi.FieldStorage()
+    if 'submit' in form.keys():
+        formvars = ['accountname', 'oldpass', 'newpass', 'newpass2']
+        form_ok = check_form(formvars, form)
+        if form_ok == True:
+            accountname = form['accountname'].value
+            accountname = accountname.split("@")[0]
+            oldpass = form['oldpass'].value
+            newpass = form['newpass'].value
+            newpass2 = form['newpass2'].value
+            if newpass == newpass2:
+                if check_oldpw(accountname, oldpass) == '':
+                    vpasswdargs = ['vpasswd', accountname]
+                    # Environmental variable HOME is needed for vpasswd to work
+                    os.environ['HOME'] = home_dir   
+                    p = Popen(vpasswdargs, stdin=PIPE, stdout=PIPE, stderr=subprocess.STDOUT)   
+                    p.stdin.write(newpass + '\n')
+                    p.stdin.write(newpass2 + '\n')
+                    p.stdin.close()
+                    if p.wait() == 0:
+                        # We did it
+                        main_content = read_template_file('success.tpl')
+                    else:
+                        main_content = read_template_file('fail.tpl', message=cgi.escape(p.stdout.read()))
+                else:
+                    main_content = read_template_file('fail.tpl', message=cgi.escape( check_oldpw(accountname, oldpass)))
+            else:
+                main_content = read_template_file('fail.tpl', message='Passwords to not match.')
+        elif form_ok == False:
+            main_content = read_template_file('fail.tpl', message='All fields are required.')
+        else:
+            main_content = read_template_file('fail.tpl', message='Invalid data type supplied.')
+    else:
+        # Submit button not pressed, show form
+        formaction = cgi.escape("https://" + os.environ["HTTP_HOST"] + os.environ["REQUEST_URI"])
+        form = read_template_file('form.tpl', formaction=formaction)
+        main_content = form
+
+    response = generate_headers() + "\n"
+    response += read_template_file('main.tpl', main_content=main_content)
+    print(response)
+
+if __name__ == "__main__":
+    main()
+

tpl/.htaccess

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+Order allow,deny
+Deny from all

tpl/fail.tpl

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+<div class="error">
+    <h2>Oops, something went wrong…</h2>
+    <p>Message: <span class="message">{$message}</span></p>
+    <a href="" class="back">Try again</a>
+</div>

tpl/form.tpl

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+<form action="{$formaction}" method="post">
+    <div id="PasswordForm">
+        <p><label for="accountname">Mail Account Name:</label>
+        <input type="text" name="accountname" id="accountname" placeholder="Your account name, including internal prefix" required></p>
+        <p><label for="oldpass">Old Mail Password:</label>
+        <input type="password" name="oldpass" id="oldpass" required></p>
+        <p><label for="newpass">New Mail Password:</label>
+        <input type="password" name="newpass" id="newpass" required></p>
+        <p><label for="newpass2">Repeat New Mail Password:</label>
+        <input type="password" name="newpass2" id="newpass2" required></p>
+        <p><input type="submit" name="submit" value="Change Password"></p>
+    </div>
+</form>

tpl/main.tpl

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+<!DOCTYPE html>
+<html>
+<head>
+<title>Change Mailbox Password</title>
+<meta charset="utf-8">
+<style>
+    html {
+        font-family: Calibri, Cantarell, sans-serif;
+        font-size: 110%;
+    }
+
+    h1 {
+        font-weight: bold;
+        font-size: 2rem;
+        border-bottom: 1px solid #aaa;
+        padding: 0 0 .5rem 0;
+        margin: 0 0 2rem 0;
+    }
+
+    h2 {
+        font-weight: bold;
+        font-size: 1rem;
+        margin: 0 0 1rem 0;
+    }
+
+    label {
+        display: block;
+        float: left;
+        width: 13rem;
+        text-align: right;
+        padding: .3rem 1rem;
+        color: #777;
+    }
+
+    input[type="text"], input[type="password"] {
+        padding: .3rem;
+        width: 22rem;
+
+    }
+
+    input[type="submit"] {
+        margin-left: 15rem;
+    }
+
+    a {
+        color: #009;
+    }
+
+    a:hover, a:focus {
+        text-decoration: none;
+    }
+
+    #Main {
+        margin: 3rem auto;
+        padding: 1rem;
+        width: 40rem;
+        border: 1px solid #ccc;
+        box-shadow: 3px 3px 15px #eee;
+        border-radius: 3px;
+    }
+
+    .error p {
+        margin-left: 2rem;
+    }
+
+    .error .message {
+        color: #900;
+        font-style: italic;
+    }
+
+    .error a {
+        display: block;
+        text-align: right;
+    }
+</style>
+<body>
+    <div id="Main">
+        <h1>Change Mailbox Password</h1>
+        {$main_content}
+    </div>
+</body>
+</html>

tpl/success.tpl

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+<p class="success">Your password was changed successfully.</p>