mirror of
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55 lines
2.6 KiB
Plaintext
55 lines
2.6 KiB
Plaintext
# SPDX-License-Identifier: MIT
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# ForgeFIRM SSH policy, set in the installed files so the release image
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# carries it as built:
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# PermitRootLogin no root logs in at the serial console only
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# PermitEmptyPasswords no an account without a password cannot log in
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# PasswordAuthentication yes operator accounts log in with a password
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# The dev image's debug-tweaks turns PermitRootLogin and
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# PermitEmptyPasswords back to yes at rootfs time (ssh_allow_root_login
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# and ssh_allow_empty_password in rootfs-postcommands.bbclass match the
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# active lines too), so the bench keeps root over SSH.
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#
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# The init script starts sshd only when the control panel has turned it
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# on (/run/forgefirm/ssh-enabled, tmpfs, gone at reboot) or on the dev
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# image (/etc/forgefirm-dev). The guard sits in check_for_no_start, which
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# start, reload and restart call; stop is never gated.
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#
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# The host keys live under /data/forgefirm/ssh: sshd_check_keys makes
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# them at the first start (it reads the HostKey paths from the config),
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# and they stay across updates, so the machine's fingerprint does not
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# change with a release. The rootfs is read-only, and the
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# read-only-rootfs image feature, finding no key in the image, selects
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# sshd_config_readonly at rootfs time; both configs carry the same
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# HostKey lines, so that selection changes nothing.
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do_install:append() {
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for config in sshd_config sshd_config_readonly; do
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f=${D}${sysconfdir}/ssh/$config
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[ -e "$f" ] || continue
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sed -i \
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-e 's/^[#[:space:]]*PermitRootLogin .*/PermitRootLogin no/' \
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-e 's/^[#[:space:]]*PermitEmptyPasswords .*/PermitEmptyPasswords no/' \
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-e 's/^[#[:space:]]*PasswordAuthentication .*/PasswordAuthentication yes/' \
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-e '/^[#[:space:]]*HostKey /d' \
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"$f"
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for t in rsa ecdsa ed25519; do
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echo "HostKey /data/forgefirm/ssh/ssh_host_${t}_key" >> "$f"
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done
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grep -q '^PermitRootLogin no$' "$f" \
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&& grep -q '^PermitEmptyPasswords no$' "$f" \
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&& grep -q '^PasswordAuthentication yes$' "$f" \
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&& [ "$(grep -c '^HostKey /data/forgefirm/ssh/' "$f")" = 3 ] \
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|| bbfatal "$config: the ForgeFIRM policy lines did not land"
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done
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init=${D}${sysconfdir}/init.d/sshd
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sed -i '/^check_for_no_start() {$/a\
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[ -e /run/forgefirm/ssh-enabled ] || [ -e /etc/forgefirm-dev ] || {\
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echo "sshd: not enabled (turn it on from the ForgeFIRM control panel)"\
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exit 0\
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}' "$init"
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grep -q 'forgefirm/ssh-enabled' "$init" \
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|| bbfatal "init.d/sshd: the check_for_no_start anchor was not found"
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}
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