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37 lines
1.7 KiB
37 lines
1.7 KiB
3 weeks ago
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#!/usr/bin/bash
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set -eu -o pipefail
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# Detect existing non-conforming host keys and perform the permissions migration
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# https://fedoraproject.org/wiki/Changes/SSHKeySignSuidBit
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#
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# Example output looks like:
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# Permissions 0640 for '/etc/ssh/ssh_host_rsa_key' are too open.
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# It is required that your private key files are NOT accessible by others.
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# This private key will be ignored.
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# Permissions 0640 for '/etc/ssh/ssh_host_ecdsa_key' are too open.
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# It is required that your private key files are NOT accessible by others.
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# This private key will be ignored.
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# @ WARNING: UNPROTECTED PRIVATE KEY FILE! @
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# @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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# Permissions 0640 for '/etc/ssh/ssh_host_ed25519_key' are too open.
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# It is required that your private key files are NOT accessible by others.
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# This private key will be ignored.
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# sshd: no hostkeys available -- exiting.
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#
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output="$(sshd -T 2>&1 || true)" # expected to fail
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while read line; do
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if [[ $line =~ ^Permissions\ [0-9]+\ for\ \'(.*)\'\ are\ too\ open. ]]; then
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keyfile=${BASH_REMATCH[1]}
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echo $line
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echo -e "\t-> changing permissions on $keyfile"
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chmod --verbose g-r $keyfile
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chown --verbose root:root $keyfile
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fi
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done <<< "$output"
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