Users without home directory will not be able to log-in

[ioannisky]

What happened:
When I try to connect to a remote node I some times get the following error.

ERRO [NODE]      Unable to run shell command (bash): fork/exec /bin/bash: no such file or directory id:30 local:127.0.0.1:3022 login:<username> remote:xxx.xxx.xxx.xxx:58860 teleportUser:ioannis srv/sess.go:605
ERRO [NODE]      fork/exec /bin/bash: no such file or directory regular/sshserver.go:1230

What you expected to happen:
Login to the node successfully.

How to reproduce it (as minimally and precisely as possible):
Create a user with a home directory pointing to a non existing location. Try to login to that node with that user. After creating the home directory the problem goes away.

Environment:

• Teleport version (use teleport version):
  Teleport v4.0.0-rc.3 git:v4.0.0-rc.3-2-g1544d40 go1.10.3
• Tsh version (use tsh version):
  Teleport v4.0.0-rc.3 git:v4.0.0-rc.3-2-g1544d40 go1.10.3
• OS (e.g. from /etc/os-release):

Browser environment

• Browser Version (for UI-related issues):
• Install tools:
• Others:

Relevant Debug Logs If Applicable

• tsh --debug
• teleport --debug

[fspmarshall]

Making note here... openssh seems to drop you into / if the user's home directory does not exist, so thats probably the correct fallback to use.

[angelomellos]

Plus one on this. I just ran into this issue on a host running 4.3.2.