Hacking/attack experiences...
I'm, for obvious reasons, only going to talk about the attacks I went through and the *legal* ones I did 😅 😜

Let's first get some things clear/funny facts:
I've been doing offensive security since I was 14-15. Defensive since the age of 16-17. I'm getting close to 23 now, for the record.

First system ever hacked (metasploit exploit): Windows XP.
(To be clear, at home through a pentesting environment, all legal)
Easiest system ever hacked: Windows XP yet again.

Time it took me to crack/hack into today's OS's (remote + local exploits, don't remember which ones I used by the way):
Windows: XP - five seconds (damn, those metasploit exploits are powerful)
Windows Vista: Few minutes.
Windows 7: Few minutes.
Windows 10: Few minutes.
OSX (in general): 1 Hour (finding a good exploit took some time, got to root level easily aftewards. No, I do not remember how/what exactly, it's years and years ago)
Linux (Ubuntu): A month approx. Ended up using a Java applet through Firefox when that was still a thing. Literally had to click it manually xD
Linux: (RHEL based systems): Still not exploited, SELinux is powerful, motherfucker.

Keep in mind that I had a great pentesting setup back then 😊. I don't have nor do that anymore since I love defensive security more nowadays and simply don't have the time anymore.

Dealing with attacks and getting hacked.

Keep in mind that I manage around 20 servers (including vps's and dedi's) so I get the usual amount of ssh brute force attacks (thanks for keeping me safe, CSF!) which is about 40-50K every hour. Those ip's automatically get blocked after three failed attempts within 5 minutes. No root login allowed + rsa key login with freaking strong passwords/passphrases.

linu.xxx/much-security.nl - All kinds of attacks, application attacks, brute force, DDoS sometimes but that is also mostly mitigated at provider level, to name a few. So, except for my own tests and a few ddos's on both those domains, nothing really threatening. (as in, nothing seems to have fucked anything up yet)

How did I discover that two of my servers were hacked through brute forcers while no brute force protection was in place yet? installed a barebones ubuntu server onto both. They only come with system-default applications. Tried installing Nginx next day, port 80 was already in use. I always run 'pidof apache2' to make sure it isn't running and thought I'd run that for fun while I knew I didn't install it and it didn't come with the distro. It was actually running. Checked the auth logs and saw succesful root logins - fuck me - reinstalled the servers and installed Fail2Ban. It bans any ip address which had three failed ssh logins within 5 minutes:
Enabled Fail2Ban -> checked iptables (iptables -L) literally two seconds later: 100+ banned ip addresses - holy fuck, no wonder I got hacked!

One other kind/type of attack I get regularly but if it doesn't get much worse, I'll deal with that :)

Dealing with different kinds of attacks:

Web app attacks: extensively testing everything for security vulns before releasing it into the open.
Network attacks: Nginx rate limiting/CSF rate limiting against SYN DDoS attacks for example.
System attacks: Anti brute force software (Fail2Ban or CSF), anti rootkit software, AppArmor or (which I prefer) SELinux which actually catches quite some web app attacks as well and REGULARLY UPDATING THE SERVERS/SOFTWARE.

So yah, hereby :P

Friend of mine killed his MacBook with some Softdrink.

Just poured it all over his poor a1502.

He let it dry for a few days, it starts to work again.
Except the battery.

Goes on Amazon and buys a new battery.

New battery doesn't work either and so he tells me about it and I as stupid as I am couldn't resist the temptation to finally work on a MacBook like my "hero" Lois Rossmann does.

So turns out the board is good.
Cleaned it up and basically nothing happened to it.

So what's the deal with "los batlerias"?

The first got hit by liquid, the second had a broken connection to a cell.
That could have happened through my friend, installing it without testing it first, or at the seller, so it being a DOA battery.

Now away from the stupidity of my friend and the situation to the actual source for this rant.

Once something happens to a modern Managed battery, the Battery Management System (BMS) disconnects the voltage from the system and goes into an error state, staying there and not powering anything ever again.
For noobs, it's dead. Buy a new one.

But It can be reset, depending you know how to, and which passwords were set at the factory.
Yes, the common Texas instruments BQ20Zxx chips have default passwords, and apple seems to leav them at default.

The Usb to SMBus adaptors arrived a few days ago and I went to prod the BMS.

There is a very nice available for Windows called BE2works, that I used the demo of to go in and figure out stuff. The full version supports password cracking, the demo not.

After some time figuring out how Smart Battery Systems (SBS) "API" works, I got to actually enter the passwords into the battery to try get into manufacturer and full access mode.

Just to realise, they don't unlock the BMS.

So, to conclude, my friend bought a "new" battery that was most likely cut out of a used / dead macbook, which reports 3000mah as fully charged instead of the 6xxx mah that it should have, with 0 cycles and 0hours used.
And non default access.

This screams after those motherfuckers scaming the shit out of people on Amazon, with refurb, reset, and locked fucken batteries.

I could kill those people right now.

Last but not least,
My friend theoretically can't send it back because I opened the battery to fix the broken connection.
Though maybe, it'll get send back anyway, with some suprise in the package.

The tech stack at my current gig is the worst shit I’ve ever dealt with...

I can’t fucking stand programs, especially browser based programs, to open new windows. New tab, okay sure, ideally I just want the current tab I’m on to update when I click on a link.

Ticketing system: Autotask
Fucking opens up with a crappy piss poor sorting method and no proper filtering for ticket views. Nope you have to go create a fucking dashboard to parse/filter the shit you want to see. So I either have to go create a metric-arse tonne of custom ticket views and switch between them or just use the default turdburger view. Add to that that when I click on a ticket, it opens another fucking window with the ticket information. If I want to do time entry, it just feels some primal need to open another fucking window!!! Then even if I mark the ticket complete it just minimizes the goddamn second ticket window. So my jankbox-supreme PC that my company provided gets to strugglepuff along trying to keep 10 million chrome windows open. Yeah, sure 6GB of ram is great for IT work, especially when using hot steaming piles of trashjuice software!

I have to manually close these windows regularly throughout the day or the system just shits the bed and halts.

RMM tool: Continuum
This fucker takes the goddamn soggy waffle award for being utterly fucking useless. Same problem with the windows as autotask except this special snowflake likes to open a login prompt as a full-fuck-mothering-new window when we need to open a LMI rescue session!!! I need to enter a username and a password. That’s it! I don’t need a full screen window to enter credentials! FUCK!!! Btw the LMI tools only work like 70% of the time and drag ass compared to literally every other remote support tool I’ve ever used. I’ve found that it’s sometimes just faster to walk someone through enabling RDP on their system then remoting in from another system where LMI didn’t decide to be fully suicidal and just kill itself.

Our fucking chief asshat and sergeant fucknuts mcdoogal can’t fucking setup anything so the antivirus software is pushed to all client systems but everything is just set to the default site settings. Absolutely zero care or thought or effort was put forth and these gorilla spunk drinking, rimjob jockey motherfuckers sell this as a managed AntiVirus.

We use a shitty password manager than no one besides I use because there is a fully unencrypted oneNote notebook that everyone uses because fuck security right? “Sometimes it’s just faster to have the passwords at the ready without having to log into the password manager.” Chief Asshat in my first week on the job.

Not to mention that windows server is unlicensed in almost every client environment, the domain admin password is same across multiple client sites, is the same password to log into firewalls, and office 365 environments!!!

I’ve brought up tons of ways to fix these problems, but they have their heads so far up their own asses getting high on undeserved smugness since “they have been in business for almost ten years”. Like, Whoop Dee MotherFucking Doo! You have only been lucky to skate by with this dumpster fire you call a software stack, you could probably fill 10 olympic sized swimming pools to the brim with the logarrhea that flows from your gullets not only to us but also to your customers, and you won’t implement anything that is good for you, your company, or your poor clients because you take ten minutes to try and understand something new.

I’m fucking livid because I’m stuck in a position where I can’t just quit and work on my business full time. I’m married and have a 6m old baby. Between both my wife and I working we barely make ends meet and there’s absolutely zero reason that I couldn’t be providing better service to customers without having to lie through my teeth to them and I could easily support my family and be about 264826290461% happier!

But because we make so little, I can’t scrap together enough money to get Terranimbus (my startup) bootstrapped. We have zero expendable/savable income each month and it’s killing my soul. It’s so fucking frustrating knowing that a little time and some capital is all that stands between a better life for my family and I and being able to provide a better overall service out there over these kinds of shady as fuck knob gobblers.

TL;DR I'm fucking sick and tired of Devs cutting corners on security! Things can't be simply hidden a bit; security needs to be integral to your entire process and solution. Please learn from my story and be one of the good guys!

As I mentioned before my company used plain text passwords in a legacy app (was not allowed to fix it) and that we finally moved away from it. A big win! However not the end of our issues.

Those Idiot still use hardcoded passwords in code. A practice that almost resulted in a leak of the DB admin password when we had to publish a repo for deployment purposes. Luckily I didn't search and there is something like BFG repo cleaner.

I have tried to remedy this by providing a nice library to handle all kinds of config (easy config injection) and a default json file that is always ignored by git. Although this helped a lot they still remain idiots.
The first project in another language and boom hardcoded password. Dev said I'll just remove before going live. First of all I don't believe him. Second of all I asked from history? "No a commit will be good enough..."

Last week we had to fix a leak of copyrighted contend.
How did this happen you ask? Well the secure upload field was not used because they thought that the normal one was good enough. "It's fine as long the URL to the file is not published. Besides now we can also use it to upload files that need to be published here"
This is so fucking stupid on so many levels. NEVER MIX SECURE AND INSECURE CONTENT it is confusing and hard to maintain. Hiding behind a URL that thousands of people have access to is also not going to work. We have the proof now...
Will they learn? Maybe for a short while but I remain sceptic. I hope a few DevrRanters do!

"The default password is your birthday"
They don't even make you change it

So my ISP decided it was ok for them to log into my router remotely and re enable the wifi.

I turned it off for a reason and no your excuse that it will improve my upload speed is bullshit you stupid patronising fucking shithead.

I'm now seriously looking into cancelling my service with you because you don't respect your customers or their wishes.

Also I'm guessing there's a default backdoor password into the router as I changed all the passwords I could find. Meaning the whole thing is horribly insecure.

Apparently DELETE and... most of the HTTP verbs are disabled by default in IIS (ASP/ MVC/ Microsoft server software)

Am I wrong in saying that's fucking bullshit?!

Why make an HTTP serving environment with a massive array of tools to help you do everything you need in the web environment... And then DISABLE some of the web protocol??? What???

Not even the obscure verbs. DELETE. Is microsoft the type of bitch to delete using a GET request?? I bet the send passwords as get parameters.

Another rant about my school: the default password system.
Each student's username is FirstnameLastname, and the same applies to teachers. The passwords assigned are <First initial><Last initial> for students, and the same for teachers with "teacher" appended to the end. As students, we figured out this system pretty quickly, and we were able to log into the computer system as any teacher who we knew had requested an account. (Teacher accounts had unfiltered Internet access, student accounts did not).
I now teach in this school, where they recently got Google Classrooms accounts for each teacher during Covid. The accounts use the same naming/password scheme! I somehow doubt the teachers replace their passwords, so any student clever enough to figure out the system can log into their Google for Education account.

Speaking of.. What in your opinion would be an appropriate way to warn someone about security problems, like db passwords in git?

I once came across dozens of extremely sensitive services' infra accesses: alibaba/aliexpress, natuonal observatories, gov institutions, telecomms, etc. I had dozens [if not hundreds] routers' and firewalls' credentials along with addresses. I tried one to confirm validity - it worked. I wanted to warn them but did not want to get in trouble.

If it were servers, I'd set a motd or append some warning messages in .profile. But not sure how to do it for non-server devices

what would you do? How would you warn them?

P.S. Deleting that record was a smart move, buddy ;)

p.P.S. Sorry, wrong category... Can't edit now :(

ZNC shenanigans yesterday...

So, yesterday in the midst a massive heat wave I went ahead, booze in hand, to install myself an IRC bouncer called ZNC. All goes well, it gets its own little container, VPN connection, own user, yada yada yada.. a nice configuration system-wise.

But then comes ZNC. Installed it a few times actually, and failed a fair few times too. Apparently Chrome and Firefox block port 6697 for ZNC's web interface outright. Firefox allows you to override it manually, Chrome flat out refuses to do anything with it. Thank you for this amazing level of protection Google. I didn't notice a thing. Thank you so much for treating me like a goddamn user. You know Google, it felt a lot like those plastic nightmares in electronics, ultrasonic welding, gluing shit in (oh that reminds me of the Nexus 6P, but let's not go there).. Google, you are amazing. Best billion dollar company I've ever seen. Anyway.

So I installed ZNC, moved the client to bouncer connection to port 8080 eventually, and it somewhat worked. Though apparently ZNC in its infinite wisdom does both web interface and IRC itself on the same port. How they do it, no idea. But somehow they do.

And now comes the good part.. configuration of this complete and utter piece of shit, ZNC. So I added my Freenode username, password, yada yada yada.. turns out that ZNC in its infinite wisdom puts the password on the stdout. Reminded me a lot about my ISP sending me my password via postal mail. You know, it's one thing that your application knows the plaintext password, but it's something else entirely to openly share that you do. If anything it tells them that something is seriously wrong but fuck! You don't put passwords on the goddamn stdout!

But it doesn't end there. The default configuration it did for Freenode was a server password. Now, you can usually use 3 ways to authenticate, each with their advantages and disadvantages. These are server password, SASL and NickServ. SASL is widely regarded to be the best option and if it's supported by the IRC server, that's what everyone should use. Server password and NickServ are pretty much fallback.

So, plaintext password, default server password instead of SASL, what else.. oh, yeah. ZNC would be a server, right. Something that runs pretty much forever, 24/7. So you'd probably expect there to be a systemd unit for it... Except, nope, there isn't. The ZNC project recommends that you launch it from the crontab. Let that sink in for a moment.. the fucking crontab. For initializing services. My whole life as a sysadmin was a lie. Cron is now an init system.

Fortunately that's about all I recall to be wrong with this thing. But there's a few things that I really want to tell any greenhorn developers out there... Always look at best practices. Never take shortcuts. The right way is going to be the best way 99% of the time. That way you don't have to go back and fix it. Do your app modularly so that a fix can be done quickly and easily. Store passwords securely and if you can't, let the user know and offer alternatives. Don't put it on the stdout. Always assume that your users will go with default options when in doubt. I love tweaking but defaults should always be sane ones.

One more thing that's mostly a jab. The ZNC software is hosted on a .in domain, which would.. quite honestly.. explain a lot. Is India becoming the next Chinese manufacturers for software? Except that in India the internet access is not restricted despite their civilization perhaps not being fully ready for it yet. India, develop and develop properly. It will take a while but you'll get there. But please don't put atrocities like this into the world. Lastly, I know it's hard and I've been there with my own distribution project too. Accept feedback. It's rough, but it is valuable. Listen to the people that criticize your project.

Somebody, anybody, tell me what I'm missing here that makes this get mass-produced.

I've always been a bit if a pyro, and ive certainly made random, pointless texh for no valid reason beyond "why not?'. I also have dealt in international OEM sourcing and manufacturing. I even missed the selfie stick boom back before anyone knew they existed... muktille faxriries I've done signing business with were selling them(dead stock) below cost due to lack... silly me thought they were too ridiculous; one of my hudiness cards literally says ".Really cool stuff you almost alwats want... but never need". Most nonsense novelty is the majority of one if my businesses

...but seriously... who thinks a rechargeable battery, compact soeakers, and lit gas canister is a good idea??

I think I may need to re-rank my mental list of most asinine things I've encountered this week... wsl GUI capability built-in with default images and the reminder of pointoess features like passwords for groups, seem less worthy now.

Not only is the default password they set a piece of shit, the password field actually shows the password even after you save it, why even bother with security?

Hash your fucking passwords!

The internet kills my insides.

No idea what the fuck just happened, but my home router just dropped the internet connection and started demanding that I change the admin (default) password.
Now, I know that default passwords are bad and all that, but why the fuck now? This thing has been sitting there for over a year, and it only decided to complain now?

There have been some weird things going on lately, and I'm starting to worry that some of my systems may have been compromised in some way... but I'm not sure what/how, nor how to look for it...

Any tips for identifying a breach and disaster recovery?

If you create a website with a login function, please mention the password requirements on the login page (not just the signup page, in the login page too). So i know which of my default passwords i used for this website.

A while back I was looking for a new job and was given an interview by one company who shall remain nameless. Before the interview, they asked me look through their current site, nothing unusual there, so I started browsing. Then I received an email with all the details I needed to access their production server. Apparently they wanted me to look through the code, unusual but I did so.

First thing all the passwords, including those belonging to members of the public were stored in plain text and many were still the default passwords which were based on the Id so were sequential.

I highlighted these issues at the interview and they then asked me to do a test, not the usual test though, they asked me to add some charts to their prod site. Needless to say that didn’t happen and I got another job elsewhere.

So, I’ve been given the task of sorting the security out in an application plugging the holes and whatnot as to be honest it’s shocking haha. It doesn’t help that we automate security audits but that’s a different rant for another day.

We’re using devise for authentication (rails standard, ♥️ devise), we have no password resets through the login page, it has to be manually reset by ringing support, why who knows, even though it’s built into the gem and we allow the user to login using an username instead of an email because for whatever reason someone thought it was a bright idea to not have the email field mandatory.

So I hop onto a call with the BAs, basically I go that we need to implement password resets into the login page so the user can do it themselves and also to cut down support calls a ticket is already in place for it. So I go through the standardised workflow for resetting a password. My manager goes.

“I don’t think this will be very secure”

Wait.. what. Have you never reset a password before? It’s following the same protocol as every other app.

We go back and fourth and I said I’ll get it checked with security just to keep him happy.

The issue mainly is well we can’t implement password resets due to 100s of users not having an email on there account.. 🙃 so before we push this change we need to try and notice all users to set a unique email.

Updated the tickets. All dandy.

Looking at the PRs to see what security things have been done if any and turns out one of the devs in India has just written a migration to add the same default email to every user that doesn’t have an email present and yep it got merged. So I go revert the change but talk about taking a “we don’t care about security approach”.

Eventually we want to have the user reset their passwords and login using their email and someone goes a head and does that. Not to mention the security risk.

Jesus Christ I wonder why I bother sometimes.

I've been wondering about renting a new VPS to get all my websites sorted out again. I am tired of shared hosting and I am able to manage it as I've been in the past.

With so many great people here, I was trying to put together some of the best practices and resources on how to handle the setup and configuration of a new machine, and I hope this post may help someone while trying to gather the best know-how in the comments. Don't be scared by the lengthy post, please.

The following tips are mainly from @Condor, @Noob, @Linuxxx and some other were gathered in the webz. Thanks for @Linux for recommending me Vultr VPS. I would appreciate further feedback from the community on how to improve this and/or change anything that may seem incorrect or should be done in better way.

1. Clean install CentOS 7 or Ubuntu (I am used to both, do you recommend more? Why?)
2. Install existing updates
3. Disable root login
4. Disable password for ssh
5. RSA key login with strong passwords/passphrases
6. Set correct locale and correct timezone (if different from default)
7. Close all ports
8. Disable and delete unneeded services
9. Install CSF
10. Install knockd (is it worth it at all? Isn't it security through obscurity?)
11. Install Fail2Ban (worth to install side by side with CSF? If not, why?)
12. Install ufw firewall (or keep with CSF/Fail2Ban? Why?)
13. Install rkhunter
14. Install anti-rootkit software (side by side with rkhunter?) (SELinux or AppArmor? Why?)
15. Enable Nginx/CSF rate limiting against SYN attacks
16. For a server to be public, is an IDS / IPS recommended? If so, which and why?
17. Log Injection Attacks in Application Layer - I should keep an eye on them. Is there any tool to help scanning?

If I want to have a server that serves multiple websites, would you add/change anything to the following?
18. Install Docker and manage separate instances with a Dockerfile powered base image with the following? Or should I keep all the servers in one main installation?
19. Install Nginx
20. Install PHP-FPM
21. Install PHP7
22. Install Memcached
23. Install MariaDB
24. Install phpMyAdmin (On specific port? Any recommendations here?)

I am sorry if this is somewhat lengthy, but I hope it may get better and be a good starting guide for a new server setup (eventually become a repo). Feel free to contribute in the comments.

Relatively often the OpenLDAP server (slapd) behaves a bit strange.

While it is little bit slow (I didn't do a benchmark but Active Directory seemed to be a bit faster but has other quirks is Windows only) with a small amount of users it's fine. slapd is the reference implementation of the LDAP protocol and I didn't expect it to be much better.

Some years ago slapd migrated to a different configuration style - instead of a configuration file and a required restart after every change made, it now uses an additional database for "live" configuration which also allows the deployment of multiple servers with the same configuration (I guess this is nice for larger setups). Many documentations online do not reflect the new configuration and so using the new configuration style requires some knowledge of LDAP itself.
It is possible to revert to the old file based method but the possibility might be removed by any future version - and restarts may take a little bit longer. So I guess, don't do that?

To access the configuration over the network (only using the command line on the server to edit the configuration is sometimes a bit... annoying) an additional internal user has to be created in the configuration database (while working on the local machine as root you are authenticated over a unix domain socket). I mean, I had to creat an administration user during the installation of the service but apparently this only for the main database...

The password in the configuration can be hashed as usual - but strangely it does only accept hashes of some passwords (a hashed version of "123456" is accepted but not hashes of different password, I mean what the...?) so I have to use a single plaintext password... (secure password hashing works for normal user and normal admin accounts).

But even worse are the default logging options: By default (atleast on Debian) the log level is set to DEBUG. Additionally if slapd detects optimization opportunities it writes them to the logs - at least once per connection, if not per query. Together with an application that did alot of connections and queries (this was not intendet and got fixed later) THIS RESULTED IN 32 GB LOG FILES IN ≤ 24 HOURS! - enough to fill up the disk and to crash other services (lessons learned: add more monitoring, monitoring, and monitoring and /var/log should be an extra partition). I mean logging optimization hints is certainly nice - it runs faster now (again, I did not do any benchmarks) - but ther verbosity was way too high.

The worst parts are the error messages: When entering a query string with a syntax errors, slapd returns the error code 80 without any additional text - the documentation reveals SO MUCH BETTER meaning: "other error", THIS IS SO HELPFULL... In the end I was able to find the reason why the input was rejected but in my experience the most error messages are little bit more precise.

Vivaldi browser seemed a good idea to escape Google's misfeatures without swapping it for Microsoft extensions (Edge) or Firefox / Gecko idiosyncrasies (size / magnification issues on Ubuntu, slow Android version, clunky UI). But there are some ongoing issues that I never experienced in any other user agent (maybe I will when switching to Chromium), like URL completion (port URLs without a protocol aren't prepended with https but trigger a xdg-open dialog, autocomplete prefers obscure deep links with long paths instead of the base URL, browsers seems to forget login passwords by default, etc.) - so Chromium seems like the obvious choice. But there seem to be no more Chromium builds for Android? Anyone else disappointed by Vivaldi has a preferred solution?

I recently started working on laravel. As the community says it was easy to get along with the framework and its methodologies. But then i had to do multiple login with framework in same domain.

Oh man, i spent a week to make it work. All those guards and middlewares realted to login was driving me crazy. The concept was clear, but somehow the framework was like "You! I shall make you spend a week for my satisfaction". The project demo was nearing and i was doing all kind of stuff i found. Atlast after continous tries it worked. Never in my 4+ years as a developer i had to face such an issue with login.

So here is how it works,if anyone faces the same issue:
(This case is beneficial if you're using table structures different from default laravel auth table structures)

1. Define the guards for each in auth.php
Eg:
'users' => [
'driver' => 'session',
'provider' => 'users',
],
'client' => [
'driver' => 'session',
'provider' => 'client',
],
'admin' => [
'driver' => 'session',
'provider' => 'admins',
],

2. Define providers for each guards in auth.php
'users' => [
'driver' => 'eloquent',
'model' => <Model Namespace>::class,
'table' => '<table name>', //Optional. You can define it in the model also
],
'admins' => [
'driver' => 'eloquent',
'model' => <Model Namespace>::class,
],
'client' => [
'driver' => 'eloquent',
'model' => <Model Namespace>::class,
],

Similarly you can define passwords for resetting passwords in auth.php

3. Edit login controller in app/Http/Controller/Auth folder accordingly
a. Usually this particular line of code is used for authentication
Auth::guard('<guard name>')->attempt(['email' => $request->email, 'password' => $request->password]);
b. If above mentioned method doesn't work, You can directly login using login method
EG:
$user = <model namespace>::where([
'username' => $request->username,
'password' => md5($request->password),
])->first();
Auth::guard('<guard name>')->login($user);

4. If you're using custom build table to store user details, then you should adjust the model for that particular table accordingly. NOTE: The model extends Authenticatable
EG
class <model name> extends Authenticatable
{
use Notifiable;

protected $table = "<table name>";

protected $guard = '<guard name>';

protected $fillable = [
'name' , 'username' , 'email' , 'password'
];

protected $hidden = [
'password' ,
];

//Below changes are optional, according to your need
public $timestamps = false;
const CREATED_AT = 'created_time';
const UPDATED_AT = 'updated_time';

//To get your custom id field, in this case username
public function getId()
{
return $this->username;
}
}

5. Create login views according to the user types you required

6. Update the RedirectIfAuthenticated middleware for auth redirections after login

7. Make sure to not use the default laravel Auth routes. This may cause some inconsistancy in workflow

The laravel version which i worked on and the solution is for is Laravel 6.x