** Description changed: [impact] starting in focal, systemd-logind runs sandboxed without any network access, which breaks any configuration that uses remote servers for user data, e.g. ldap, nis, etc A more full discussion is available in the upstream bug report as well as the debian bug report, see other info section below [test case] many possible ways to reproduce this; there are reproducers in some of the bugs reported before that are caused by this, e.g. bug 1915502 or bug 1916235 [regression potential] failure to authenticate when using remote user data, incorrect authentication, security issues due to un-sandboxing of systemd-logind [scope] this is needed in f and later before focal, systemd-logind was not sandboxed so this did not apply [other info] - this isn't actually a bug in systemd, this is a by-design security - feature, and the intended upstream design is for systemd-logind to talk - to systemd-userdb, so that systemd-logind can remain network-sandboxed - while systemd-userdb performs any needed network access for user/auth - data. However, Debian and Ubuntu don't enable/provide systemd-userdb, so - that design does not work for Debian/Ubuntu. + this isn't actually a bug in systemd, this is a by-design security feature; see links below (and/or comment 13 in this bug) to upstream comments about how systemd's position is that no NSS module should ever perform network access, and any NSS module that does needs to also adjust the restrictions of systemd services such as systemd-logind, systemd-userdbd, and possibly others that might need to make NSS calls into glibc. + https://github.com/systemd/systemd/issues/7074#issuecomment-338157851 + https://github.com/systemd/systemd/issues/15705#issuecomment-624125354 - this also can cause systemd-udevd failures in some cases as well, - apparently (based on upstream and debian discussion comments) + this may also can cause systemd-udevd failures in some cases as well. + https://github.com/systemd/systemd/pull/7343#issuecomment-344800313 For reference, upstream discussion around the systemd-logind sandboxing specifically: https://github.com/systemd/systemd/issues/7074 upstream updated doc PR explaining the upstream position: https://github.com/systemd/systemd/pull/7343 Debian bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878625
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1934393 Title: systemd-logind network access is blocked, and breaks remote authentication configurations To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1934393/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
