Authorization is the process of determining whether a user, program or device is allowed to access a protected resource in a particular way. Authorization is a key theme in computer security practices.

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63
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10answers
23k views

Can I scratch off the magnetic strip off a debit card to only allow chip and PIN?

I have been robbed in the past by thieves using my HSBC Debit Card (issued by UAE branch) to purchase mobile phones and accessories by signing for the purchases. While the card has chip & PIN ...
41
votes
2answers
23k views

Difference Between OAUTH, OpenID and OPENID Connect in very simple term?

I am very confused the difficult jargon available in web about OAUTH, OpenID and OPENID Connect. Can anyone tell me the difference in simple words.
36
votes
1answer
29k views

What is the difference between RBAC and DAC/ACL?

What are the benefits of each, and when should I choose one over the other? Are there situations where these should be merged? Do you have examples of common usages? And what about MAC, where ...
35
votes
6answers
21k views

Why use OpenID Connect instead of plain OAuth?

I just started to use OAuth 2.0 as a way to authenticate my users. It works great - I just use the identity/profile API of each provider to get a validated email address of the user. Now I read about ...
34
votes
3answers
3k views

Overarching term for 'authentication' and 'authorization'?

The internet is rife with 'authentication vs. authorization'-type questions. I'm not asking that here. I'm wondering if there is some overarching term that encompasses both of these. I've seen ...
34
votes
3answers
19k views

Should we store accesstoken in our database for oauth2?

I have a requirement to implement Facebook and Google login in my web application. I also need to access a user's Facebook/Google+ friend list. I have gone through the complete OAuth2 documentation of ...
23
votes
5answers
3k views

ZX Spectrum tape loader: how was copy prevention implemented?

I am curious how copy prevention was implemented for games or other programs loaded from cassette on the micro computers of the early 1980s, such as the ZX Spectrum 48k. If I recall correctly, some ...
23
votes
4answers
7k views

How secure is NOPASSWD in passwordless sudo mode?

On all our boxes we have ssh access via keys. All keys are password protected. At this moment the sudo mode is not passwordless. Because the number of VMs are growing in our setup, we investigate the ...
23
votes
2answers
9k views

Role Based Authorization vs. Claim Based Authorization

What is the difference between "role based authorization" and "claim based authorization"? Under which circumstances would it be appropriate to implement each of these authorization models?
21
votes
3answers
2k views

Pitfalls of using OAuth for mobile Applications

OAuth is a popular authorization solution for web applications and mobile applications. What the pitfalls of using OAuth are in those two scenarios (as a web application providing OAuth access to my ...
16
votes
4answers
3k views

Role Based Access Control + Data Ownership based permissions

Is there a common system or pattern that combines the permissions given by a role in a RBAC-system with permissions in relation to dataownership? For example: Bob is a doctor and has the role ...
15
votes
2answers
9k views

OAuth2 Cross Site Request Forgery, and state parameter

http://tools.ietf.org/html/draft-ietf-oauth-v2-30#section-10.12 says: The client MUST implement CSRF protection [...] typically accomplished by requiring any request sent to the redirection URI ...
11
votes
4answers
713 views

How should I tell an organisation that they are vulnerable when I wasn't given permission to check?

I was recently at a village hall (in the UK), some distance from where I live, for a party. I noticed that they had unsecured wi-fi with an SSID of NETGEAR. I assumed it was free wi-fi for users of ...
10
votes
4answers
829 views

Does UNIX have a dual approval mechanism?

Sudo and logging is used to keep administrators accountable. But is there a command/configuration that lets you enforce a dual approval type control such as the the "Two Person Concept"? (eg. Two ...
10
votes
4answers
1k views

RBAC model: user in two roles access dilemma

I am implementing the Role-Based Access Control (RBAC) model security system and I have a dilemma: one User1 is in Role1 and is in Role2. Role1 allows access to the Resource1 and Role2 denies access ...
10
votes
1answer
181 views

How does a refresh token help? [duplicate]

I have a basic doubt or apparently am missing out on something fundamental. When talking about an Android app that talks to the backend using APIs, the access to the resources/APIs are protected ...
9
votes
2answers
3k views

Claim Based Authorization vs Attribute Based Access Control

Is there a difference between Attribute Based Access Control which is usually associated with XACML and Claim Based Authorization which seems to be a term coined by Microsoft? Is the latter simply ...
9
votes
1answer
807 views

What datastructure would/have you used to store ACLs within a hybrid ACL/RBAC system?

In our system, every resource has an access control list (ACLs), which list entries (ACEs) that have a specific kind of access to that resource. The ACE can be for end-entities (eg: users like "Mr Q") ...
8
votes
4answers
304 views

School's computers auto-login and can run .exe's

Before this semester, to use any computer across campus, you had to log into Windows with a username and password. This semester, when the computers start up they auto-login to an account (with ...
8
votes
1answer
935 views

What were the specific security flaws with OAuth 1.0? How are they being addressed in 2.0?

I read an article documenting Twitter abruptly pulling its OAuth support back in April 2009. The article said it wouldn't specify the hole for security reasons, but mentioned "social engineering" is ...
8
votes
2answers
6k views

When do you use OpenID vs. OpenID Connect

Can they be used together? ....or are they two separate protocols that may or may not be useful depending on the context? The reason I ask is because I'm trying to implement the following: User ...
8
votes
2answers
7k views

Best way to allow sudo access when using ssh keys

Probably a simple question, but I can't seem to find any actual best practices out there. I manage a handful of servers and I am really getting sick of tracking my passwords in pwsafe. I've been ...
8
votes
3answers
4k views

SAML2 vs. OAuth - What are some reasonable relationships?

I have a service that allows SSO via SAML2. When SAML2 is used, we delegate the entire authentication process to the Identity Provider. We are considering adding OAuth in order to support some ...
8
votes
3answers
7k views

How to manage admin rights for helpdesk staff?

My question is about issuing administrative rights to helpdesk staff in a large Active Directory setting. Helpdesk staff commonly require administrative rights to provide support for end users. I ...
8
votes
1answer
445 views

How to protect a Wifi network from Microsoft WiFi Sense

Microsoft is deploying a new feature, WiFi Sense, which provides users a way to easily share passwords to wireless networks with all of their contacts. This introduces a new security failure mode: a ...
8
votes
2answers
243 views

How do high-performance web applications control permission to their content?

So, I believe I understand the logic behind authorization standards like OAuth. The OAuth token contains information about the user (name, role, etc.), which I can use to secure my application. ...
7
votes
2answers
248 views

mobile number authorization strategy using SMS, best pattern and practices

In recent years, mobile number has become an important factor for authentication and hence more and more enterprises employ methods to capture their users' mobile numbers using SMS. In a typical ...
6
votes
2answers
2k views

Claims based vs Permission based authorization

So I understand roles vs permissions. I also understand roles vs claims. In both cases claims and permissions are granular, usually per feature or business operation such as AddPerson permission. ...
6
votes
1answer
180 views

Client identification using client certificates

I have the following scenario: Several independent embedded servers (Linux/ARM/lighttpd) Several independent controlling devices (win32/iOS/Android) Each server should have at least one controlling ...
6
votes
1answer
244 views

Cascaded Sudo for privilege elevation

I intend to use the least privileged user to do a given task. The issue is that it involve a kind of responsibility chain and translate as a sudo chain in my scripts, spreading the overall task in ...
6
votes
2answers
1k views

Does enabling EnableLinkedConnections pose a security risk?

As shown Microsoft's TechNet, network shares that are mapped by logon scripts are shared with the standard user access token instead of with the full administrator access token. Here's the gist of it: ...
6
votes
1answer
175 views

Microservice to Microservice Auth

We're planning a new architecture which will utlize a backend of many different microservices that will need to talk with each other as well as field requests from systems not part of the service. In ...
6
votes
1answer
1k views

Do I need to keep the NTLM token in the HTTP Authorization header a secret?

I'm troubleshooting a problem with one of our vendors and plan to send them a Fiddler trace of the http traffic between the client and our servers while replicating the issue. Our servers use NTLM ...
5
votes
2answers
114 views

OAuth2 and Authentication

I see a lot of confusion about OAuth2 and Authentication so I created this question in the hope to clear some of the confusion. So, let's talk about the following points : What is the difference ...
5
votes
1answer
2k views

Hotspot with same SSID, how does authorization work?

My university has a wireless network I log into with my username and password. It's using PEAP. My phone and laptop automatically connect to this SSID when they detect the network. If someone sets up ...
5
votes
1answer
4k views

WCF - Is this a good security Architecture?

I am building an information recording system (WCF based) for a business that is accessible by staff over the internet. This software will not be distributed and there will only be a handful of users ...
5
votes
2answers
127 views

Preventing fraudulent access to restriced resource on the web?

I'm working on a web application along with a web API and I've been warned against what seems to be a basic vulnerability: not checking that the user making an action has sufficient privileges on the ...
5
votes
1answer
150 views

How should resource providers validate OAuth2 tokens?

Resource providers often provide read and write access to resources. A resource provider should therefore not only validate the token (is it expired? is it revoked? is it valid? does it contain the ...
5
votes
1answer
5k views

What is the difference between claims, attributes, and roles?

Many questions have already been asked about Claims-based authentication and the differences with other approaches: Role-based vs Claims-based Explain claims-based authentication Now, my favorite ...
5
votes
2answers
1k views

Why is 'Bearer' required before the token in 'Authorization' header in a HTTP request?

What exactly is the difference between following two headers: Authorization : Bearer cn389ncoiwuencr vs Authorization : cn389ncoiwuencr All the sources which I have gone through, sets ...
5
votes
2answers
329 views

How to secure a local socket?

I have made a service written in c that runs on the Android operating system as a core service. I have a few Android apps which communicate with this service via a socket connection (Java -> C). My ...
5
votes
1answer
252 views

Security protocol for NFC stickers/cards

Lets say I'm using NFC cards for access control. NFC cards/stickers are easily readable and writable, so my worry is that the data on them could easily be cloned onto another card/sticker and bypass ...
5
votes
2answers
101 views

What to use as 'state' in OAuth2 Authorization Code Grant workflow

I'm using csrf protection in my web app. Now I'm planning to trigger a OAuth2 Authorization Code Grant workflow, starting with a static template opened in a new browser window using ...
4
votes
2answers
150 views

using two passwords for normal and security critical functions

a user (can be admin) for example in a website has: a password that is used for normal and everyday access (not security critical actions). another password that is used for performing security ...
4
votes
1answer
3k views

Looking for approach to implement attribute based access control (ABAC)

We are looking to implement Attribute-Based Access Control. While we are sold on the philosophy, there are two topics that seem to crop up: Will it lead to significant performance issues? Especially ...
4
votes
2answers
361 views

Does providing OAuth for mobile apps pose a security threat?

Let's take a look at the basic OAuth workflow: The basic idea is that the Consumer (App) asks the user to grant him access to the Service Provider. The service protects the user by asking him each ...
4
votes
1answer
45 views

Use OpenId Connect for authentication only

OpenId Connect adds authentication to the OAuth2 protocol. OAuth2 is a protocol used for authorization. But what if I'm only interested in authenticating a user? After reading up on OpenId Connect, it ...
4
votes
2answers
80 views

Is it a good practice to use certificates as a mean of client identification in a cloud environment

My software system is running a cloud infrastructure where having Linux machines VPN into OpenVPN gateway is a setup requirement. Also, there may be cases when software on the aforementioned Linux ...
4
votes
1answer
101 views

Purpose for “One Time Use Token”

I'm connecting a Salesforce ORG with a third party vender through a custom API (they basically wrote it just for us). The API requires you to retrieve a "token" that you pass into other calls through ...
4
votes
1answer
641 views

user/pass auth vs hmac signed for REST API

I know they both prevent the RESTful APIs from abuse. Hmac signed api is commonly used than the other. But I think using user/pass pair for authorization is more security, here's the reason: To sign ...