computers

How To: Use PHP to Change a Bluehost Email Account Password

This is a PHP script I wrote that allows you to incorporate an email password update option into your own webpage styling. Normally, with Bluehost (and FastDomain and HostMonster), your users can only change their email account password by either having the admin login to their cpanel and changing it for them, or by accessing the Bluehost provided webmail interface. Neither are very inviting solutions, especially in a professional environment.

The script works by accessing the shadow file associated with the email account’s domain name. It looks for the username whose password is being changed in the shadow file and, if found, compares the password stored in the shadow file with the password that the user enters as their current password. If those passwords match, it then updates the shadow file with the users’ new password. The password is stored in the shadow file as a Base64 encoded salted MD5 hash which is generated using either the PHP crypt function (if available) or the openssl command line.

This script will work out of the box, however, I recommend using it with the current visual theme of your website otherwise you’re defeating the purpose. The hidden input field named “domain” may be edited so that users only have to enter the name portion (ie: joesnuffy) of their email address without the domain portion. If left un-edited, your users will be required to enter in the domain portion of their email address along with the name portion (ie: joesnuffy@linuxr0ckz.com).

This script will work with Bluehost, FastDomain, HostMonster (all operated by Bluehost) and I’m guessing it will also work with any other host that uses cpanel (unverified).

<?php

$message = "";
$found = $valid = false;

if (isset($_POST['username']) && $_POST['username'] != "") {
    $domain_pos = strpos($_POST['username'], "@");
    if ($domain_pos === false) {
        $username = $_POST['username'];
        $domain = $_POST['domain'];
    } else {
        $username = substr($_POST['username'], 0, $domain_pos);
        $domain = substr($_POST['username'], $domain_pos + 1);
    }
    
    $current_password = $_POST['current_password'];
    $new_password1 = $_POST['new_password1'];
    $new_password2 = $_POST['new_password2'];
    
    $root = $_SERVER['DOCUMENT_ROOT'];
    $path_elements = explode('/', $root);
    $root = "/{$path_elements[1]}/{$path_elements[2]}"; // for bluehost, extracts homedir ex: /homeN/blueuser may work with other hosts?
    $shadow_file = "$root/etc/$domain/shadow";

    // check if the shadow file exists. if not, either an invalid
    // domain was entered or this may not be a bluehost account...?
    if (file_exists($shadow_file)) {
        // compare the new passwords entered to ensure they match.    
        if ($new_password1 == $new_password2) {
            if (trim($new_password1) != "") {
                // get the contents of the shadow file.
                $shadow = file_get_contents($shadow_file);
                $lines = explode("\n", $shadow);
                
                // go through each line of shadow file, looking for username entered.
                for ($i = 0; $i < count($lines); $i++) {
                    $elements = explode(":", $lines[$i]);
                    // found the user...
                    if ($elements[0] == $username) {
                        $found = true;
                        $passwd = explode("$", $elements[1]);
                        $salt = $passwd[2]; // get the salt currently used 
                        
                        // crypt the "Current Password" entered by user. Can use either builtin 
                        // php crypt function or command line openssl command.
                        if (CRYPT_MD5 == 1) { // indicates whether or not the crypt command supports MD5.
                            $current = crypt($current_password, '$1$'.$salt.'$');
                        } else {
                            $current = trim(`openssl passwd -1 -salt "$salt" "$current_password"`);
                        }
                        // check if the current password entered by the user
                        // matches the password in the shadow file.
                        $valid = ($current == $elements[1]);
                        
                        if ($valid) {
                            // if they match then crypt the new password using the same salt
                            // and modify the line in the shadow file with the new hashed password
                            if (CRYPT_MD5 == 1) {
                                $new = crypt($new_password1, '$1$'.$salt.'$');
                            } else {
                                $new = trim(`openssl passwd -1 -salt "$salt" "$new_password1"`);
                            }
                            $elements[1] = $new;
                            $lines[$i] = implode(":", $elements);
                        }
                        
                        break;
                    }
                }
                
                if (!$found) {
                    $message = "The username you entered is not valid.";
                } else if (!$valid) {
                    $message = "The password you entered is not valid.";
                } else {
                    // write the new contents of the shadow back to the shadow file.
                    $shadow = implode("\n", $lines);
                    file_put_contents($shadow_file, $shadow);
                    $message = 'Your password has been updated.';
                }
            } else {
                $message = "Your password cannot be blank.";
            }
        } else {
            $message = "Both new passwords must match.";
        }
    } else {
        $message = "The domain you entered is not valid.";
    }
}

?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
    <head>
        <meta http-equiv="content-type" content="text/html; charset=UTF-8" /> 
        <title>Change Password</title>
    </head>
    
    <body>            
        <?php
            if ($message != "") {
                $color = $found && $valid ? "green" : "red";
                echo "<span style=\"color:$color;\">$message</span>";
            }
        ?>
        
        <form action="" method="post">
            <input type="hidden" name="domain" value="somebluehostdomain.com" />
            <table>
                <tbody>
                    <tr>
                        <td><label for="username">Username</label></td> 
                        <td><input name="username" id="username" type="text" /></td> 
                    </tr>
                    <tr>
                        <td><label for="current_password">Current Password</label></td> 
                        <td><input name="current_password" id="current_password" type="password" /></td> 
                    </tr>
                    <tr>
                        <td><label for="new_password1">New Password</label></td> 
                        <td><input name="new_password1" id="new_password1" type="password" /></td> 
                    </tr>
                    <tr>
                        <td><label for="new_password2">New Password</label></td> 
                        <td><input name="new_password2" id="new_password2" type="password" /></td> 
                    </tr>
                    <tr>
                        <td colspan="2" style="text-align:center;">
                            <input type="submit" value="Update Password" />
                        </td>
                    </tr>
                </tbody> 
            </table> 
        </form>
    </body>
</html>
Thursday, September 29th, 2011 coding, computers, linux, php, technology 1 Comment

Windows 7 as a Wi-Fi Access Point

Ever needed a wireless router but didn’t have one handy? Ever use an ad-hoc wireless network with Internet Connection Sharing to get other devices connected quickly? What if you have say an Android phone with no cell network data connection but really need to connect it to the Internet but don’t have a wireless router handy (Android won’t connect to an ad-hoc network without rooting the device)? Here’s how to setup Windows 7 to act as a Wi-Fi access point (aka infrastructure) for you and anyone else you want to allow to connect. Note: This doesn’t work on Windows 7 Starter Edition as Internet Connection Sharing is not enabled.

  1. Open an elevated command prompt.
  2. Execute the following command, replacing <some_ssid> with an ssid of your choosing and <some_passphrase> with a wpa2 compatible passphrase. If either contain spaces, enclose that portion of the command in quotes:
        netsh wlan set hostednetwork mode=allow <some_ssid> <some_passphrase> persistent
  3. Enable Internet Connection Sharing. See Using ICS (Internet Connection Sharing)
  4. Execute the following command, again using an elevated command prompt:
        netsh wlan start hostednetwork
  5. All done. Your other Wi-Fi devices should now see your wireless network and be able to connect to it.

Note: Using this method to connect an Android device, I could not get T-Mobile Wi-Fi Calling to connect to their service. I’m guessing the double-NAT would’ve caused an issue, although I have been able to connect through a double-NAT before.

Friday, September 23rd, 2011 computers, microsoft, technology, windows No Comments

Bulk Convert DOCX to DOC

Someone requested a DOCX to DOC converter like the XLSX to XLS converter I posted previously, so here it is (download at bottom of post)!

Click here to download the program. It requires that you have Microsoft Office 2007 or newer installed and the Microsoft .Net Framework 3.5.

Sunday, April 24th, 2011 computers, data, microsoft, windows 2 Comments

Collage Generator

I needed to find images of money. I searched the Internet but couldn’t find anything that great or multiple images that were unique but in the same style. I decided to download images of bills from Wikipedia and write my own program to generate a few different collages. Below I’ve included some screen shots of example usages and their corresponding output. Scroll to the bottom of this post to download the program.

Collage Generator v1.0.0 Copyright (c) 2011 Tanner Jepsen

Friday, April 8th, 2011 algorithms, c#, coding, computers 1 Comment

Identify This Cipher

Using cryptographic analysis on a cipher produced by an existing software program, I was able to write my own compatible algorithm for re-producing the cipher. The only trouble is I have no idea which cipher it is. Perhaps combinations of different ciphers or maybe even a new cipher all together? No, I won’t say which software program uses this cipher, but I wonder if anyone can identify and/or classify it. I believe it to be a symmetric key stream cipher–albeit, very weak and very easy to analyze.

Disclaimer: I invoke my right to free speech to post cryptographic source code. See Bernstein v. United States.

Usage Examples:

Console.WriteLine(Convert.ToBase64String("mypassword".Cipher("378518030611953")));
// or
Console.WriteLine("mypassword".Cipher("378518030611953").ToHexString());
// or
Console.WriteLine("mypassword".Cipher(ASCIIEncoding.ASCII.GetBytes("somekey")).ToHexString());

Corresponding Output Examples:

// y8kJikhp6ItISg==
// or
// cbc9098a4869e88b484a
// or
// c5c4a58605c4c785a527

The Code:

using System;
using System.Text;

namespace MyExtensions
{
    public static class Extensions
    {
        public static byte[] Cipher(this string password, string key)
        {
            byte[] cipher = System.Text.ASCIIEncoding.ASCII.GetBytes(password);
            return cipher.Cipher(key);
        }

        public static byte[] Cipher(this string password, byte[] key)
        {
            byte[] cipher = System.Text.ASCIIEncoding.ASCII.GetBytes(password);
            return cipher.Cipher(key);
        }

        public static byte[] Cipher(this byte[] password, string key)
        {
            try
            {
                byte[] k = key.ParseBytes();
                return password.Cipher(k);
            }
            catch (Exception e)
            {
                throw new Exception("The key can consist only of a string of numbers. No letters or special characters.", e);
            }
        }

        public static byte[] Cipher(this byte[] password, byte[] key)
        {
            byte[] cipher = password;
            for (int i = 0; i < cipher.Length; i++)
            {
                int first = 0x09;
                int last = 0xE9;
                int rounds = cipher[i] ^ key[i % key.Length];

                for (int y = 0; y <= rounds; y++)
                {
                    last += 32;
                    if (last > 255) last = first = first + (y % 16 / 2) - 3;
                    if (last < 0) last = first = 14;
                }
                cipher[i] = (byte)last;
            }
            return cipher;
        }

        public static byte[] ParseBytes(this string s)
        {
            return s.ToCharArray().ParseBytes();
        }

        public static byte[] ParseBytes(this char[] data)
        {
            byte[] p = new byte[data.Length];
            for (int i = 0; i < data.Length; i++)
            {
                byte parsed;
                if (!byte.TryParse(data[i].ToString(), out parsed))
                    throw new Exception("The input can only consist of numbers. No letters or special characters.");
                p[i] = parsed;
            }
            return p;
        }

        public static string ToHexString(this byte[] data)
        {
            string s = string.Empty;
            for (int i = 0; i < data.Length; i++)
            {
                s += data[i].ToHexString();
            }
            return s;
        }

        public static string ToHexString(this byte b)
        {
            return Convert.ToString(b, 16).PadLeft(2, "0");
        }

        public static string PadLeft(this string s, int totalWidth, string padding)
        {
            return s.PadLeft(totalWidth, char.Parse(padding));
        }

        public static string PadRight(this string s, int totalWidth, string padding)
        {
            return s.PadRight(totalWidth, char.Parse(padding));
        }
    }
}
Saturday, March 12th, 2011 academic, algorithms, c#, coding, computers, data No Comments

Interesting Error from Win 7

I don’t know what I’d do with a 734 PB file.

Thursday, December 16th, 2010 computers, microsoft, windows No Comments

Install exFAT FUSE Module for Ubuntu with Read/Write Support

http://code.google.com/p/exfat/

sudo apt-get install subversion scons libfuse-dev gcc
cd ~
svn co http://exfat.googlecode.com/svn/trunk/ exfat-read-only
cd exfat-read-only
scons
sudo scons install
cd ..
rm -rf exfat-read-only
sudo mkdir [mountpoint]
sudo mount -t exfat-fuse [device_path] [mountpoint]

Replace [device_path] with the device path to your exfat partition, for example: /dev/sdb1. Replace [mountpoint] with the path to your mount point, for example: /media/disk

Monday, July 5th, 2010 computers, data, linux, technology, ubuntu 14 Comments

Accessing an IMAP account using SSL (OpenSSL on Gmail)


C:\>openssl s_client -crlf -connect imap.gmail.com:993
CONNECTED(00000003)
depth=1 /C=US/O=Google Inc/CN=Google Internet Authority
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
i:/C=US/O=Google Inc/CN=Google Internet Authority
1 s:/C=US/O=Google Inc/CN=Google Internet Authority
i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
---
Server certificate
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
issuer=/C=US/O=Google Inc/CN=Google Internet Authority
---
No client certificate CA names sent
---
SSL handshake has read 1704 bytes and written 300 bytes
---
New, TLSv1/SSLv3, Cipher is RC4-MD5
Server public key is 1024 bit
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1
Cipher : RC4-MD5
Session-ID: 059F9016BB7EF76FC1080A02368D4812EF5619D9176C176412A0A8F786C2E71C

Session-ID-ctx:
Master-Key: EFE3B0BFEAE372829EA6B9B306BEB5BE2F5BBE5D325CF9F01940BB25C8353A16
08DA3A85DC0D4581DD482F2C7B9759EB
Key-Arg : None
Start Time: 1264807587
Timeout : 300 (sec)
Verify return code: 20 (unable to get local issuer certificate)
---
* OK Gimap ready for requests from 71.231.242.11 31if8927301pzk.40
A01 LOGIN username password
* CAPABILITY IMAP4rev1 UNSELECT LITERAL+ IDLE NAMESPACE QUOTA ID XLIST CHILDREN
X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE
A01 OK username authenticated (Success)
A02 SELECT INBOX
* FLAGS (\Answered \Flagged \Draft \Deleted \Seen)
* OK [PERMANENTFLAGS (\Answered \Flagged \Draft \Deleted \Seen \*)]
* OK [UIDVALIDITY 2]
* 2636 EXISTS
* 0 RECENT
* OK [UIDNEXT 15043]
A02 OK [READ-WRITE] INBOX selected. (Success)
A04 IDLE
+ idling
DONE
A04 OK IDLE terminated (Success)
A05 LOGOUT
* BYE LOGOUT Requested
A05 OK 73 good day (Success)
read:errno=0

Friday, January 29th, 2010 computers, google, linux, technology 2 Comments

Bulk Convert XLSX to XLS

Recently at work we had to need to convert XLSX files to XLS files in bulk. My boss discovered that having to convert many files individually is not a fun process so I wrote this little program to automate the process. Here’s a screen shot:

Click here to download the program. It requires that you have Microsoft Office 2007 or newer installed and the Microsoft .Net Framework 3.5.

Tuesday, November 3rd, 2009 computers, data, microsoft 3 Comments

Convert NRG to ISO using DD

Earlier this week I was on a mission to convert an NRG image file to an ISO image file. I didn’t want to download a program that someone had already written like nrg2iso and instead preferred to use something like the linux dd command or write my own program that could do. I started digging into the NRG file format and found that it’s actually an IFF file. The documentation on how Nero implemented the IFF format into their NRG files isn’t very clear at all and is incorrect so with the information I was able to find I had to reverse engineer the format myself. Here’s how to convert an NRG image to ISO using the dd command (if you’re on windows you can install Cygwin to gain access to the dd command).

An NRG image is a CD-ROM image followed by Nero’s “footer” about the image, it’s cue sheets, cd text, and so on. The last twelve bytes of an NRG image file contain the NER5 header and an offset to the first CUE sheet of the image. Even though this offset is just a pointer to the first CUE sheet, you can use it determine the actual length of the image. Here’s what to do with dd.

  1. First, take the filesize of the NRG file and subtract 12 from it. Here, my NRG is 964,984,988 bytes. So I’m going to use 964984976 for the skip parameter of the dd command like so:
    dd ibs=1 skip=964984976 if=Image.nrg of=footer.dat
  2. That will give you a 12 byte file named footer.dat. Open footer.dat in your favorite HEX Editor (I use UltraEdit-32).
  3. The first four bytes you should see is NER5. The next eight bytes is a 64-bit number that points to the first CUE sheet. Open Calculator. Set it for Scientific view (Programmer view in Windows 7, maybe Windows Vista too?). Change to Hex mode and type in exactly what you see for those eight bytes. My Hex heditor shows 00 00 00 00 39 84 80 00. So in Calculator I type in 39848000 (you can drop all leading zeros since this is a little-endian number).
  4. Now switch back to Decimal mode. The Hex number you typed in will change to a Decimal number (964984832 in my case), this is the offset at which the first CUE sheet exists in the NRG image. It also happens to be (in most cases) the length of the cd image. Since the cd image is the first thing in the NRG file, all you have to do now is extract the contents of the image into your ISO file.
  5. Divide your decimal offset number by 2048. For me, 964984832 / 2048 = 471184. That’s how many blocks (a block being 2048 bytes for us) we’re going to copy from the NRG file to the ISO file. Now just run the DD command:
    dd ibs=2048 count=471184 if=Image.nrg of=Image.iso

That’s it.. now mount your ISO image to a virtual cd/dvd/bd drive like Virtual CloneDrive (or burn it) and make sure it works before deleting your NRG file.

Sunday, October 11th, 2009 computers, data, linux, technology, ubuntu No Comments