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Description of problem:
When the remote system doesn't have the space to increase the size of authorized_keys or authorized_keys2, the ssh-copy-id command hangs indefinitely
Version-Release number of selected component (if applicable):
openssh-7.8p1-4.el8.x86_64
How reproducible:
always
Steps to Reproduce:
1. on remote system: ln -s /dev/full /home/$USER_NAME/.ssh/authorized_keys
2. on remote system: ln -s /dev/full /home/$USER_NAME/.ssh/authorized_keys2
3. locally: ssh-copy-id remote_user@remote_system
Actual results:
command hangs
Expected results:
cat: write error: No space left on device
ssh-copy-id return code of 1
Additional info:
This is regression from RHEL-7.
This is an issue with the check making sure there is a newline added to the authorized_keys file if it is missing initially (new in OpenSSH 7.5 or so).
The command that hangs is the following, which does not work with your reproducer (/dev/full returns unlimited stream of zeroes):
tail -1c .ssh/authorized_keys
Even though I believe if the above would pass, the following does not have a check and would lead to fail without error message, because it is missing a guard " || exit 1" as the other write:
echo >> .ssh/authorized_keys
At this moment, I see a simple solution for a real-world use cases (adding the check above), but I do not see a simple way how to make also your test happy.
I do not consider this as a blocker for 8.0 release so I postponed this bug to 8.1.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2019:3702