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PAM WebSSO module in C

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# pam-weblogin

PAM WebLogin module in C

## Wiki

Accompanying wiki page for this project https://edu.nl/hjhqc

## Installation

Dependancies: libpam and libcurl. Install the dev packages for these libraries, then

```
$ make
$ make install
```
This copies the pam module to /usr/local/lib/security, creates an example configuration file in /etc/security/pam-weblogin.conf and a pam example configuration in ```/etc/pam.d/weblogin```:

## Unit tests
To run unit tests, install [check](https://libcheck.github.io/check/) and run
```
make unittest
```

In addition, to show coverage of the tests, run:
```
make clean
make unittest COVERAGE=1
make coverage
```

## Testing

Change into the server directory.

Create and activate python virtualenv, `pip install -r requirements.txt` copy weblogin_daemon.yml.example to weblogin_daemon.yml and run `weblogin_daemon.py weblogin_daemon.yml` as a stub server on localhost:5001

Install pamtester to test the module (see above under Installation)

```
$ pamtester weblogin [username] authenticate
Hello [username]. To continue, visit http://localhost:5001/pam-weblogin/login/yqxvIDZV and enter pin
Pin:
Authenticated on attribute username
pamtester: successfully authenticated
```

## Production (example)

This example enables PAM WebLogin _and_ requires either publickey **or** password authentication:

Edit `sshd` as follows (add the line above @include common-auth)

### /etc/pam.d/sshd

```
# PAM configuration for the Secure Shell service

auth [success=done ignore=ignore default=die] /usr/local/lib/security/pam_weblogin.so /etc/security/pam-weblogin.conf
# Standard Un*x authentication.
@include common-auth
```

If you put these lines _above_ the `auth required` line:

```
auth [success=4 default=ignore] pam_access.so accessfile=/etc/security/exclude_iprange.conf
auth [success=3 default=ignore] pam_succeed_if.so quiet user ingroup admin
auth [success=2 default=ignore] pam_succeed_if.so quiet uid < 70000000
auth [success=1 default=ignore] pam_succeed_if.so quiet uid > 72999999
```

Logins coming from exclude range, users in the admin group and uids between 70000000 and 72999999 are allowed to continue without pam-weblogin.

Set the following configurations in `sshd_config` and restart sshd

### /etc/ssh/sshd_config

```
AuthenticationMethods publickey keyboard-interactive:pam
PubkeyAuthentication yes
KbdInteractiveAuthentication yes
UsePAM yes
```

Mind that in this example the line AuthenticationMethods signifies the option of authenticating either via publickey or keyboard-interactive (pam).

Add the `pam-weblogin.conf` and make it readable only for root (`chmod 600 /etc/seucrity/pam-weblogin.conf, chown root.root /etc/security/pam-weblogin.conf`).
### /etc/security/pam-weblogin.conf
```
url = https://sram.surf.nl/pam-weblogin
token = <replace with SRAM API TOKEN for your service>
retries = 3
attribute = email
cache_duration = 30
#cache_per_rhost
verify = /etc/ssl/ca.crt
```

-   `url` is the pam-weblogin endpoint of the weblogin server
-   `token` is the complete HTTP `Authorization` header, including `Bearer`
-   `retries` is the number of verification code retries allowed
-   `cache_duration` is the time the server should respond with a cached answer instead of reauthenticating the user, in seconds
-   `cache_per_rhost`, if activated, signals that caching should take place per remote host, so that connecting from a different IP address requires reauthentication
-   `verify` alternative SSL CA, for debug purposes

## Locking yourself out

Please make sure to create a way of accessing the machine in case you create a configuration that effectively locks you out of the machine. Practice on a local VM first.

One simple way to do this is to add an extra line to the /etc/pam.d/sshd configuration for your personal uid:
```
auth sufficient pam_succeed_if.so uid eq 1000 quiet
```

## Standalone server
Whereas this pam module was developed for use with [SRAM](https://wiki.surfnet.nl/display/SRAM) [SBS](https://github.com/SURFscz/SBS), it is also possible to integrate it in your own infrastructure. To that end, we provide a fully fuctional `pam-weblogin` server which can authenticate users by acting as an OIDC RP in an existing infratructure.  See the Readme file in `server/` for more info.

## SSH Session Multiplexing
To prevent having to go through the login sequence every time you access a pam-weblogin enabled server, you can use SSH session multiplexing to reuse an existing ssh session.

Add these lines for the host(s) you want to enable session multiplexing for to your local .ssh/config:
```
Host ssh-demo.sram.surf.nl
  ControlPath ~/.ssh/demo-%r@%h:%p
  ControlMaster auto
  ControlPersist 10m
```
## SSHFS
To prevent having to go through the login sequence every time you access a pam-weblogin enabled server, you can also use SSHFS to create a long standing filesystem mount to the remote server:

```
$ mkdir my-sshfs
$ sshfs <user>@<server>: my-sshfs
$
```

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