Public bug reported:
I received a Yubikey 4 yesterday, and attempted to set up authentication
with it on my Wily system. After installing the necessary packages, I
ran 'dpkg-reconfigure libpam-yubico' and added my ID number and key.
When I now try to log in on a VC, I first enter my username, then I get
prompted for my Yubikey. I press the button on the key and immediately
get thrown back to a VC with a login prompt and the following message in
the log:
[1805628.239225] login[29456]: segfault at 0 ip 00007f16bcb0030f sp
00007f16b1d0a540 error 4 in libc-2.21.so[7f16bca84000+1c0000]
Logins via SSH work, however; I get prompted for the Yubikey, press the
button, enter password at the next prompt and I'm logged in. It seems
authentication methods that do not open a network connection work, since
if I edit /etc/pam.d/common-auth to use challenge-response
authentication instead it works fine. The problem is that this will not
work with a remote SSH connection as it requires hardware access.
(I tried upgrading to the packages in ppa:yubico/stable, but there was
no difference - /bin/login still segfaults. I reverted to the original
Wily packages and tried again before filing this bug.)
libpam-yubico:
Installed: 2.19-1
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: libpam-yubico 2.19-1
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Dec 11 08:27:52 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-07-16 (147 days ago)
InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
SourcePackage: yubico-pam
UpgradeStatus: Upgraded to wily on 2015-10-20 (51 days ago)
** Affects: yubico-pam (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug wily
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https://bugs.launchpad.net/bugs/1525105
Title:
yubikey login segfaults /bin/login
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