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-- You received this bug notification because you are a member of Ubuntu Touch seeded 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: Fix Released Status in policykit-1 package in Ubuntu: Fix Released Status in policykit-1 source package in Trusty: Fix Committed Status in policykit-1 source package in Vivid: Fix Committed Status in policykit-1 source package in Wily: Fix Committed Bug description: [Impact] * Some PAM modules produce output of more than 1 line (e.g. PAM_TEXT_INFO may contain newlines in the message content). Polkit authentication agent is prepared to receive only single-line messages so it treats each line as a separate message. It fails to recognize the type of message for all of them except the first - hence failed authorization even if it was successful on the PAM-level. * The PAM specification does not require the modules to send only single-line messages. Thus, polkit needs to be fixed. * The helper component should escape (g_strescape) all messages before sending it up to the authentication agent. This way everything will be read as a single line and then unescaped to restore it's formatting with no changes required in PAM modules. [Test Case] * Use a pam module that returns a multi-line PAM_TEXT_INFO message on successful authentication (may require to artificially modify a pam module). * Perform a polkit authorization with e.g. pkexec ls * Correct authorization should end with a failure with an unrecognized PAM message [Regression Potential] * Fix makes advantage of the fact that polkit authentication agent already un-escapess (g_strcompress) all input from the helper component. * Fix is a backport of an upstream change. [Other Info] * Original 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). 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. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/policykit-1/+bug/1510824/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
