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[Bug 1510824] Re: PolkitAgentSession incorrectly handles multiline output (with pam_vas)

To: desktop-packages@xxxxxxxxxxxxxxxxxxx
From: Dariusz Gadomski <1510824@xxxxxxxxxxxxxxxxxx>
Date: Tue, 10 Nov 2015 09:10:23 -0000
Reply-to: Bug 1510824 <1510824@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Summary changed:

- PolkitAgentSession ignores multiline output (with pam_vas)
+ PolkitAgentSession incorrectly handles multiline output (with pam_vas)

** Description changed:

There is an error observed when Ubuntu is configured to perform
authentication via pam_vas (Vintela Authentication Services by Dell) in
a disconnected mode (using cached authentication).

Steps to reproduce:
1. Configure pam_vas client authenticating to a remote server.
2. Perform authentication to cache the credentials.
3. Disconnect from the network where the server is reachable (to force using cached information).
4. Perform an action requiring polkit authentication.

Expected result:
Authentication succeeds accompanied by the following message "You have logged in using cached account information. Some network services will be unavailable".

Actual result:
Authentication fails accompanied by the following message "You have logged in using cached account information. Some network services will be unavailable".

Probable cause:
The PolkitAgentSession part of polkit is designed to interpret only 1-line output, while interaction with pam_vas in the above scenario triggers helper to produce the following 2-line output:
- PAM_TEXT_INFO You have logged in using cached account information. Some network services will be unavailable
- SUCCESS
+ PAM_TEXT_INFO You have logged in using cached account information. Some network services
+ will be unavailable.

- The 'SUCCESS' part is never read so the authentication never finishes
- successfully.
+ The 'will be unavailable.' part is interpreted as an unknown message and
+ causes failed authorization.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: policykit-1 0.105-4ubuntu2.14.04.1
ProcVersionSignature: Ubuntu 3.16.0-52.71~14.04.1-generic 3.16.7-ckt18
Uname: Linux 3.16.0-52-generic x86_64
NonfreeKernelModules: nvidia zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.1-0ubuntu3.18
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 28 09:01:37 2015
InstallationDate: Installed on 2015-04-13 (197 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: policykit-1
UpgradeStatus: No upgrade log present (probably fresh install)

** Summary changed:

- PolkitAgentSession incorrectly handles multiline output (with pam_vas)
+ PolkitAgentSession incorrectly handles multiline output (as observed with pam_vas)

--
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Packages, which is subscribed to policykit-1 in Ubuntu.
https://bugs.launchpad.net/bugs/1510824

Title:
PolkitAgentSession incorrectly handles multiline output (as observed
with pam_vas)

Status in policykit-1 package in Ubuntu:
New
Status in policykit-1 source package in Trusty:
New
Status in policykit-1 source package in Vivid:
New
Status in policykit-1 source package in Wily:
New

Bug description:
There is an error observed when Ubuntu is configured to perform
authentication via pam_vas (Vintela Authentication Services by Dell)
in a disconnected mode (using cached authentication).

Expected result:
Authentication succeeds accompanied by the following message "You have logged in using cached account information. Some network services will be unavailable".

Actual result:
Authentication fails accompanied by the following message "You have logged in using cached account information. Some network services will be unavailable".

Probable cause:
The PolkitAgentSession part of polkit is designed to interpret only 1-line output, while interaction with pam_vas in the above scenario triggers helper to produce the following 2-line output:
PAM_TEXT_INFO You have logged in using cached account information. Some network services
will be unavailable.

The 'will be unavailable.' part is interpreted as an unknown message
and causes failed authorization.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/policykit-1/+bug/1510824/+subscriptions

References

[Bug 1510824] [NEW] PolkitAgentSession ignores multiline output (with pam_vas)
From: Dariusz Gadomski, 2015-10-28