Bug#778559: gdm3: Login temporarily unavailable if the previous user failed login

[Laverne Schrock]

Package: gdm3
Version: 3.14.1-3
Severity: important

Dear Maintainer,

* What led up to the situation?
I was implementing restrictions on login times for my users using
pam_time.so First, I enabled the pam_time.so by appending the following
to /etc/pam.d/gdm-password

	account required pam_time.so
	
Second, I added the following line to /etc/security/time.conf
	
	*;*;demo;Su1130-2130
	
* What was the outcome of this action?
The user 'demo' can login during the time specified, but during the
times not specified, login fails almost instantly, with the message:
"Sorry, that didn't work. Please try again."
	
This is the expected outcome. However, at this point, I then clicked on
"Cancel" to bring me back to the user list. This worked as expected and
I clicked on my user to login, but it just brought me to a blank screen
as if the login widget were still loading. After about 10 to 30 seconds,
I saw the login widget appear for brief moment with a message under the
password box. I was unable to read the message because it disappeared
too quickly. I was then taken back to the user list where I clicked on
'laverne' again and was able to log in normally.

* What outcome did you expect instead?
I expected that, after failure, I would be able to choose any user and
log in normally.

* Reproducibility
It seems like I can reproduce the bug with the following steps.
	1) Chose any user from the GDM user list
	2) Make the login fail (by using an incorrect password)
	3) Click "Cancel" or use the <ESC> key to return to the user list.
	4) Chose any user. (Including the one that just failed)

-Laverne



-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.37-3+b1
ii  adduser                               3.113+nmu3
ii  dconf-cli                             0.22.0-1
ii  dconf-gsettings-backend               0.22.0-1
ii  debconf [debconf-2.0]                 1.5.55
ii  gir1.2-gdm3                           3.14.1-3
ii  gnome-session [x-session-manager]     3.14.0-2
ii  gnome-session-bin                     3.14.0-2
ii  gnome-settings-daemon                 3.14.2-2
ii  gnome-shell                           3.14.2-3+b1
ii  gnome-terminal [x-terminal-emulator]  3.14.1-1
ii  gsettings-desktop-schemas             3.14.1-1
ii  libaccountsservice0                   0.6.37-3+b1
ii  libaudit1                             1:2.4-1+b1
ii  libc6                                 2.19-15
ii  libcanberra-gtk3-0                    0.30-2.1
ii  libcanberra0                          0.30-2.1
ii  libgdk-pixbuf2.0-0                    2.31.1-2+b1
ii  libgdm1                               3.14.1-3
ii  libglib2.0-0                          2.42.1-1
ii  libglib2.0-bin                        2.42.1-1
ii  libgtk-3-0                            3.14.5-1
ii  libpam-modules                        1.1.8-3.1
ii  libpam-runtime                        1.1.8-3.1
ii  libpam-systemd                        215-12
ii  libpam0g                              1.1.8-3.1
ii  librsvg2-common                       2.40.5-1
ii  libselinux1                           2.3-2
ii  libsystemd0                           215-12
ii  libwrap0                              7.6.q-25
ii  libx11-6                              2:1.6.2-3
ii  libxau6                               1:1.0.8-1
ii  libxdmcp6                             1:1.1.1-1+b1
ii  libxrandr2                            2:1.4.2-1+b1
ii  lsb-base                              4.1+Debian13+nmu1
ii  metacity [x-window-manager]           1:3.14.3-1
ii  mutter [x-window-manager]             3.14.2-1
ii  policykit-1                           0.105-8
ii  ucf                                   3.0030
ii  x11-common                            1:7.7+7
ii  x11-xserver-utils                     7.7+3+b1
ii  xterm [x-terminal-emulator]           312-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.14.0-1
ii  desktop-base               8.0.2
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  x11-xkb-utils              7.7+1
ii  xserver-xephyr             2:1.16.4-1
ii  xserver-xorg               1:7.7+7
ii  zenity                     3.14.0-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.14.0-3
ii  libpam-gnome-keyring  3.14.0-1+b1

-- Configuration Files:
/etc/gdm3/PreSession/Default changed:
PATH="/usr/bin:$PATH"
synclient RTCornerButton=2

/etc/gdm3/daemon.conf changed:
[daemon]
[security]
[xdmcp]
[greeter]
IncludeAll = true
[chooser]
[debug]

/etc/pam.d/gdm-password changed:
auth    requisite       pam_nologin.so
auth	required	pam_succeed_if.so user != root quiet_success
@include common-auth
auth    optional        pam_gnome_keyring.so
@include common-account
session [success=ok ignore=ignore module_unknown=ignore default=bad]
pam_selinux.so close
session required        pam_loginuid.so
session [success=ok ignore=ignore module_unknown=ignore default=bad]
pam_selinux.so open
session optional        pam_keyinit.so force revoke
session required        pam_limits.so
session required        pam_env.so readenv=1
session required        pam_env.so readenv=1 envfile=/etc/default/locale
@include common-session
session optional        pam_gnome_keyring.so auto_start
@include common-password
account required pam_time.so


-- debconf information:
  gdm3/daemon_name: /usr/sbin/gdm3
* shared/default-x-display-manager: gdm3