tpm-enrol: inline empty-NV first-boot enrolment (host side, TODO #11)
Builds the host side of TPM identity enrolment — the "inline single-UKI"
vehicle from docs/tpm-enrolment-design.md. A production (secure) UKI now
auto-enrols a fresh host with no client cert, then reboots into the normal
secure path.
New dracut hook files/dracut/95dot1x-macsec/tpm-enrol.sh (initqueue/settled
prio 25, BEFORE dot1x-macsec-up at 30):
- no-op when a cert is already present in NV 0x01800001 (normal boot) or
under rd.dot1x=0 (test path has no trustworthy identity to enrol);
- on EMPTY NV: generate the signing key in the TPM @0x81010001 (openssl tpm2
provider builds the CSR; key never leaves the TPM), pre-auth DHCP on the
PHYSICAL NIC (nmcli re-manages en*, overriding the secure-mode unmanaged
drop-in), POST CSR+context to rd.fleet.enrol_url, show the broker
fingerprint on Plymouth, poll /status, write the issued leaf cert (DER) to
NV, and reboot to converge.
- Empty-NV and the secure path are mutually exclusive, so this never reorders
the load-bearing boot sequence (invariant #2).
Wiring:
- module-setup.sh: require+install the tpm2 key-gen/NV tools, curl, awk, and
the openssl tpm2 PROVIDER (ossl-modules/tpm2.so, asserted present — tpm2-tss
alone can't sign with a handle: key); install the hook.
- diskless.pkr.hcl: install tpm2-openssl + curl; assert hook/tools/provider in
the initramfs (invariant #9). New enrol_url var threaded to extract-artifacts.
- extract-artifacts.sh: bake rd.fleet.enrol_url into the cmdline.
- fleet.script: enrol-active/enrol-wait/enrol-done banner; fingerprint on the
message line (public — states only, invariant #1).
Shell JSON build/parse/cert-extract pipeline (no jq in the initramfs) verified
end-to-end against a live broker. BENCH-VERIFY list in docs/TODO.md #11 (tpm2
provider key-ref on real/swtpm, empty-NV detect, pre-auth DHCP override, Plymouth
render, NV write + reboot convergence, prod HTTPS).
This commit is contained in:
Audiobuzz
@@ -7,6 +7,12 @@
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check() {
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require_binaries wpa_supplicant wpa_cli tpm2_nvread openssl || return 1
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# Inline empty-NV enrolment (tpm-enrol.sh) needs the TPM key-gen + NV-write
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# tools, curl (broker HTTP), and awk (JSON build). require them so a build
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# that lacks tpm2-openssl / curl fails LOUDLY here rather than shipping a UKI
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# that silently cannot enrol a fresh host.
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require_binaries tpm2_createprimary tpm2_create tpm2_load tpm2_evictcontrol \
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tpm2_nvdefine tpm2_nvwrite tpm2_readpublic curl awk || return 1
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return 0
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}
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@@ -37,8 +43,23 @@ install() {
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inst_multiple wpa_supplicant wpa_cli tpm2_nvread openssl ip setsid nmcli \
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grep sed cut tr sha256sum sleep mkdir nvme
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# TSS libraries that tpm2_nvread dlopens
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# Inline empty-NV enrolment (tpm-enrol.sh): TPM key-gen + NV-write tools, the
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# EK read (device context), curl (broker HTTP), awk (JSON), wc, and reboot.
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inst_multiple tpm2_createprimary tpm2_create tpm2_load tpm2_evictcontrol \
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tpm2_nvdefine tpm2_nvundefine tpm2_nvwrite tpm2_readpublic \
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tpm2_createek tpm2_flushcontext curl awk wc reboot systemctl
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# TSS libraries that the tpm2 tools + the openssl tpm2 provider dlopen.
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inst_libdir_file "libtss2-*"
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# openssl tpm2 PROVIDER (tpm2-openssl): openssl req signs the CSR with the
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# TPM key via `-provider tpm2 -key handle:0x…`. tpm2-tss alone is NOT enough
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# — the provider .so is what exposes the handle: key ref. require_binaries
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# can't see a provider, so assert the .so landed (else enrolment CSR fails).
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inst_libdir_file "ossl-modules/tpm2.so"
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if [ -z "$(find "${initdir}" -name 'tpm2.so' -path '*ossl-modules*' 2>/dev/null)" ]; then
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derror "95dot1x-macsec: openssl tpm2 provider (ossl-modules/tpm2.so) missing — install tpm2-openssl"
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return 1
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fi
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# Fleet-generic supplicant config + RADIUS CA
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inst_simple /etc/dot1x/wpa_supplicant-dot1x.conf /etc/dot1x/wpa_supplicant-dot1x.conf
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@@ -51,6 +72,11 @@ install() {
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# 99-dot1x-unmanaged.conf, which couldn't be mode-aware.
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inst_hook cmdline 10 "$moddir/nm-unmanaged.sh"
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# Inline empty-NV enrolment: runs BEFORE dot1x-macsec-up.sh (priority 25 < 30).
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# No-op when a cert is already present (normal boot) or under rd.dot1x=0; on a
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# fresh host it enrols an identity into NV then reboots into the secure path.
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inst_hook initqueue/settled 25 "$moddir/tpm-enrol.sh"
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# Hook: runs from the initqueue once the NIC exists, before netroot
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inst_hook initqueue/settled 30 "$moddir/dot1x-macsec-up.sh"
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@@ -0,0 +1,230 @@
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#!/bin/bash
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# tpm-enrol.sh — initqueue/settled hook, runs BEFORE dot1x-macsec-up.sh.
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#
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# INLINE empty-NV enrolment (docs/tpm-enrolment-design.md, "inline single-UKI").
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# The production UKI auto-detects a host with NO client cert in TPM NV and, in
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# that case ONLY, branches into first-time identity enrolment:
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# 1. generate a signing key IN the TPM, persist at 0x81010001 (if absent)
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# 2. build a CSR with that key via the openssl tpm2 provider (key never leaves)
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# 3. pre-auth DHCP on the PHYSICAL NIC (plaintext L2 — same pre-auth permit the
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# firmware used to fetch the UKI; there is no macsec/identity yet)
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# 4. POST CSR + device context to the enrolment broker; show the returned
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# fingerprint on the Plymouth splash for an admin to cross-check + approve
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# 5. poll until APPROVED, write the issued cert (DER) to NV 0x01800001
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# 6. REBOOT — the next boot finds the cert present and runs the normal secure
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# path (this hook exits 0 immediately when a cert is already present).
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#
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# Empty-NV and the normal secure path are MUTUALLY EXCLUSIVE (a host with no cert
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# cannot do 802.1X→MACsec→NVMe at all), so this never interleaves with — or
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# reorders — the load-bearing secure boot sequence (invariant #2). Enrolment is
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# gated to the secure build (skipped under rd.dot1x=0) because the open/test path
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# has no trustworthy device identity to enrol (design open-question).
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type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
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# One enrol attempt per boot. The stamp is set only once we COMMIT to enrolling
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# (NV confirmed empty) — not on entry — so the "cert present"/skip paths stay
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# re-runnable across repeated settled invocations, matching dot1x-macsec-up.sh
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# (which likewise stamps only on a terminal decision).
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STAMP=/run/dot1x/.enrol-done
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[ -e "$STAMP" ] && exit 0
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mkdir -p /run/dot1x
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export TPM2TOOLS_TCTI="device:/dev/tpmrm0"
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ply() { plymouth update --status="$1" 2>/dev/null || true; }
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plymsg() { plymouth message --text="$1" 2>/dev/null || true; }
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# --- skip conditions --------------------------------------------------------
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# Test path: no real identity to enrol; leave the open-port boot untouched.
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if [ "$(getarg rd.dot1x=)" = "0" ]; then
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exit 0
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fi
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# Explicit opt-out (e.g. a provisioning-UKI variant handling enrol elsewhere).
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if [ "$(getarg rd.fleet.enrol=)" = "0" ]; then
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info "tpm-enrol: disabled by rd.fleet.enrol=0"
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exit 0
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fi
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# --- knobs (override on the kernel cmdline) ---------------------------------
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NVINDEX=$(getarg rd.dot1x.nvindex=); [ -n "$NVINDEX" ] || NVINDEX=0x01800001
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HANDLE=$(getarg rd.fleet.enrol.handle=); [ -n "$HANDLE" ] || HANDLE=0x81010001
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CN=$(getarg rd.fleet.enrol.cn=); [ -n "$CN" ] || CN=fleet-host
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ENROL_URL=$(getarg rd.fleet.enrol_url=); [ -n "$ENROL_URL" ] || ENROL_URL=http://boot.fleet.lab/enrol
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NETTMO=$(getarg rd.dot1x.timeout=); [ -n "$NETTMO" ] || NETTMO=60
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# Human-approval wait. Generous but bounded: an abandoned enrol must not hang the
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# box forever (it drops to emergency, where the missing cert is diagnosable).
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WAITTMO=$(getarg rd.fleet.enrol.timeout=); [ -n "$WAITTMO" ] || WAITTMO=1800
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# Wait briefly for the TPM resource-manager device so an early settle (before the
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# TPM driver is up) doesn't misread NV as empty and wrongly trigger enrolment.
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i=0
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while [ ! -e /dev/tpmrm0 ] && [ "$i" -lt 10 ]; do sleep 1; i=$((i + 1)); done
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if [ ! -e /dev/tpmrm0 ]; then
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warn "tpm-enrol: /dev/tpmrm0 absent — no TPM; leaving to the secure path"
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exit 0
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fi
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# --- 0. already enrolled? then this is a normal boot — get out of the way ----
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# A present, non-empty NV cert means identity exists; dot1x-macsec-up.sh (next
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# hook) reads it and runs the secure path. Only an EMPTY/undefined NV enrols.
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if tpm2_nvread "$NVINDEX" -o /run/dot1x/nvprobe.der >/dev/null 2>&1 \
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&& [ -s /run/dot1x/nvprobe.der ]; then
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info "tpm-enrol: client cert present at NV $NVINDEX — normal boot"
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rm -f /run/dot1x/nvprobe.der
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exit 0
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fi
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# Committed to enrolling — set the once-per-boot lock now.
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: > "$STAMP"
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warn "tpm-enrol: NV $NVINDEX empty — starting FIRST-TIME TPM enrolment"
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ply enrol-active
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plymsg "TPM enrolment: contacting fleet…"
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# NIC: explicit rd.dot1x.if=, else first non-loopback, non-macsec interface.
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NIC=$(getarg rd.dot1x.if=)
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if [ -z "$NIC" ]; then
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for _dev in /sys/class/net/*; do
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_name=${_dev##*/}
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case "$_name" in lo|macsec*) continue ;; esac
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NIC=$_name; break
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done
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fi
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[ -n "$NIC" ] || { warn "tpm-enrol: no network interface found"; exit 1; }
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# --- 1. persistent TPM signing key (create only if absent) ------------------
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if ! tpm2_readpublic -c "$HANDLE" >/dev/null 2>&1; then
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info "tpm-enrol: creating TPM signing key, persisting at $HANDLE"
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if ! { tpm2_createprimary -C o -G ecc -g sha256 -c /run/dot1x/primary.ctx >/dev/null \
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&& tpm2_create -C /run/dot1x/primary.ctx -G ecc256:ecdsa-sha256 \
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-u /run/dot1x/key.pub -r /run/dot1x/key.priv >/dev/null \
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&& tpm2_load -C /run/dot1x/primary.ctx -u /run/dot1x/key.pub \
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-r /run/dot1x/key.priv -c /run/dot1x/key.ctx >/dev/null \
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&& tpm2_evictcontrol -C o -c /run/dot1x/key.ctx "$HANDLE" >/dev/null; }; then
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warn "tpm-enrol: failed to create/persist TPM key at $HANDLE"
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plymsg "TPM enrolment FAILED (key generation)"; exit 1
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fi
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else
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info "tpm-enrol: reusing existing persistent key at $HANDLE"
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fi
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# --- 2. CSR with the TPM key (private key never leaves the TPM) -------------
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if ! openssl req -new -provider tpm2 -provider default \
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-key "handle:$HANDLE" -subj "/O=fleet/CN=$CN" \
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-out /run/dot1x/enrol.csr 2>/run/dot1x/enrol.err; then
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warn "tpm-enrol: CSR generation failed (openssl tpm2 provider?): $(cat /run/dot1x/enrol.err 2>/dev/null)"
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plymsg "TPM enrolment FAILED (CSR / tpm2 provider)"; exit 1
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fi
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# --- 3. pre-auth network on the PHYSICAL NIC --------------------------------
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# Secure-mode nm-unmanaged.sh leaves en* UNMANAGED (wpa_supplicant would own it),
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# but there is no supplicant yet — so explicitly hand the NIC to NM for a
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# plaintext pre-auth DHCP lease (same permit-set the firmware used for the UKI).
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# The runtime `nmcli device set managed yes` overrides the unmanaged drop-in.
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ip link set "$NIC" up 2>/dev/null || true
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nmcli device set "$NIC" managed yes 2>/dev/null || true
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nmcli -w 0 device connect "$NIC" 2>/dev/null || true
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i=0
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while [ "$i" -lt "$NETTMO" ]; do
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ip -4 addr show "$NIC" 2>/dev/null | grep -q 'inet ' && break
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sleep 1; i=$((i + 1))
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done
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if [ "$i" -ge "$NETTMO" ]; then
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warn "tpm-enrol: no pre-auth DHCP lease on $NIC after ${NETTMO}s"
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plymsg "TPM enrolment FAILED (no network)"; exit 1
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fi
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info "tpm-enrol: pre-auth lease on $NIC; reaching broker at $ENROL_URL"
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# --- device context (advisory; helps the admin recognise the device) --------
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MAC=$(cat "/sys/class/net/$NIC/address" 2>/dev/null)
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DMI_UUID=$(cat /sys/class/dmi/id/product_uuid 2>/dev/null)
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DMI_SERIAL=$(cat /sys/class/dmi/id/product_serial 2>/dev/null)
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EK_HASH=""
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if tpm2_createek -G ecc -u /run/dot1x/ek.pub -c /run/dot1x/ek.ctx >/dev/null 2>&1; then
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EK_HASH=$(sha256sum /run/dot1x/ek.pub 2>/dev/null | cut -d' ' -f1)
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tpm2_flushcontext /run/dot1x/ek.ctx >/dev/null 2>&1 || true
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fi
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# --- 4. POST the CSR + context ----------------------------------------------
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# JSON body, no jq in the initramfs: escape the PEM (newlines -> \n, quotes) with
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# awk and interpolate. curl uses the fleet CA for an https endpoint.
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CSR_ESC=$(awk 'BEGIN{ORS=""}{gsub(/\\/,"\\\\");gsub(/"/,"\\\"");printf "%s\\n",$0}' /run/dot1x/enrol.csr)
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printf '{"csr":"%s","context":{"mac":"%s","dmi_uuid":"%s","dmi_serial":"%s","ek_hash":"%s"}}' \
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"$CSR_ESC" "$MAC" "$DMI_UUID" "$DMI_SERIAL" "$EK_HASH" > /run/dot1x/enrol-req.json
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CURL_TLS=()
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case "$ENROL_URL" in https:*) CURL_TLS=(--cacert /etc/dot1x/radius-ca.pem) ;; esac
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if ! curl -fsS "${CURL_TLS[@]}" -X POST "$ENROL_URL/request" \
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-H 'Content-Type: application/json' --data @/run/dot1x/enrol-req.json \
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-o /run/dot1x/enrol-resp.json 2>/run/dot1x/enrol.err; then
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warn "tpm-enrol: broker /request failed: $(cat /run/dot1x/enrol.err 2>/dev/null)"
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plymsg "TPM enrolment FAILED (broker unreachable)"; exit 1
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fi
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ENROL_ID=$(sed -n 's/.*"enrol_id":"\([^"]*\)".*/\1/p' /run/dot1x/enrol-resp.json)
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FP=$(sed -n 's/.*"fingerprint":"\([^"]*\)".*/\1/p' /run/dot1x/enrol-resp.json)
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if [ -z "$ENROL_ID" ]; then
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warn "tpm-enrol: broker did not return an enrol_id: $(cat /run/dot1x/enrol-resp.json 2>/dev/null)"
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plymsg "TPM enrolment FAILED (bad broker response)"; exit 1
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fi
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info "tpm-enrol: enrol_id=$ENROL_ID fingerprint=$FP"
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# --- 5. show the fingerprint + poll for approval ----------------------------
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# The fingerprint is PUBLIC (derived from the CSR public key) — displaying it is
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# allowed under invariant #1 (state, not a secret). An admin cross-checks it
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# against the broker's pending queue and approves.
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ply enrol-wait
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plymsg "APPROVE THIS DEVICE — code: $FP"
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i=0
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while [ "$i" -lt "$WAITTMO" ]; do
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if curl -fsS "${CURL_TLS[@]}" "$ENROL_URL/status/$ENROL_ID" \
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-o /run/dot1x/enrol-status.json 2>/dev/null; then
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STATE=$(sed -n 's/.*"state":"\([^"]*\)".*/\1/p' /run/dot1x/enrol-status.json)
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case "$STATE" in
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approved) break ;;
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denied) warn "tpm-enrol: enrolment DENIED by admin"
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plymsg "TPM enrolment DENIED"; exit 1 ;;
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expired) warn "tpm-enrol: enrolment request expired"
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plymsg "TPM enrolment EXPIRED — reboot to retry"; exit 1 ;;
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esac
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fi
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sleep 5; i=$((i + 5))
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done
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if [ "${STATE:-}" != "approved" ]; then
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warn "tpm-enrol: no approval within ${WAITTMO}s"
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plymsg "TPM enrolment TIMED OUT"; exit 1
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fi
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# --- 6. write the issued cert to NV + reboot into the secure path -----------
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ply enrol-done
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plymsg "Enrolment approved — installing identity"
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# Extract the cert PEM (leaf first if a chain was returned), unescape \n.
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CERT_ESC=$(sed -n 's/.*"cert":"\(.*\)","hostnqn":.*/\1/p' /run/dot1x/enrol-status.json)
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[ -n "$CERT_ESC" ] || CERT_ESC=$(sed -n 's/.*"cert":"\(.*\)".*/\1/p' /run/dot1x/enrol-status.json)
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printf '%b' "$CERT_ESC" > /run/dot1x/enrol-cert.pem
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# Keep only the FIRST certificate (the leaf) for NV — the hostnqn/EAP identity.
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awk 'BEGIN{n=0} /BEGIN CERTIFICATE/{n++} n==1{print} /END CERTIFICATE/{if(n==1)exit}' \
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/run/dot1x/enrol-cert.pem > /run/dot1x/enrol-leaf.pem
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if ! openssl x509 -in /run/dot1x/enrol-leaf.pem -outform DER \
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-out /run/dot1x/enrol-leaf.der 2>/dev/null; then
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warn "tpm-enrol: issued cert is not valid PEM"; plymsg "TPM enrolment FAILED (bad cert)"; exit 1
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fi
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SZ=$(wc -c < /run/dot1x/enrol-leaf.der)
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info "tpm-enrol: writing ${SZ}-byte cert to NV $NVINDEX"
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tpm2_nvundefine "$NVINDEX" -C o >/dev/null 2>&1 || true
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if ! { tpm2_nvdefine "$NVINDEX" -C o -s "$SZ" \
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-a 'ownerread|ownerwrite|authread|authwrite' >/dev/null \
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&& tpm2_nvwrite "$NVINDEX" -C o -i /run/dot1x/enrol-leaf.der >/dev/null; }; then
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warn "tpm-enrol: failed to write cert to NV $NVINDEX (TPM owner auth?)"
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plymsg "TPM enrolment FAILED (NV write)"; exit 1
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fi
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SERIAL=$(openssl x509 -in /run/dot1x/enrol-leaf.pem -serial -noout 2>/dev/null | cut -d= -f2 | tr 'A-F' 'a-f')
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info "tpm-enrol: ENROLLED (cert serial $SERIAL). Rebooting into the secure path."
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plymsg "Enrolment complete — rebooting"
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sleep 2
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systemctl --no-block reboot 2>/dev/null || reboot -f 2>/dev/null || \
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{ echo 1 > /proc/sys/kernel/sysrq 2>/dev/null; echo b > /proc/sysrq-trigger 2>/dev/null; }
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# Do not fall through to the secure path in this (pre-reboot) boot.
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exit 0
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@@ -66,11 +66,26 @@ foot = Sprite(foot_img);
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foot.SetX(sw / 2 - foot_img.GetWidth() / 2);
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foot.SetY(sh / 2 + 150);
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# ---- first-boot TPM enrolment banner (only shown on an empty-NV host) ----
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# tpm-enrol.sh drives enrol-active/enrol-wait/enrol-done; the public fingerprint
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# rides the message line (on_message) below. States only, no per-host secret.
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enrol_b = Sprite(); enrol_b.SetOpacity(0);
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fun enrol_banner(text, r, g, b) {
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eimg = Image.Text(text, r, g, b, 1, "Sans Bold 16");
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enrol_b.SetImage(eimg);
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||||
enrol_b.SetX(sw / 2 - eimg.GetWidth() / 2);
|
||||
enrol_b.SetY(sh / 2 - 70);
|
||||
enrol_b.SetOpacity(1.0);
|
||||
}
|
||||
|
||||
# ---- status tokens from the boot hooks ----
|
||||
fun set(i, s) { state[i] = s; draw(i); }
|
||||
|
||||
fun on_status(t) {
|
||||
if (t == "mode-test") { set(0, 3); set(1, 3); set(2, 3); }
|
||||
if (t == "enrol-active") { set(0, 1); enrol_banner("FIRST-BOOT TPM ENROLMENT", 1.00, 0.72, 0.10); }
|
||||
if (t == "enrol-wait") enrol_banner("AWAITING ADMIN APPROVAL — verify the code below", 1.00, 0.72, 0.10);
|
||||
if (t == "enrol-done") { enrol_banner("IDENTITY ENROLLED — rebooting", 0.10, 1.00, 0.50); set(0, 2); }
|
||||
if (t == "tpm-active") set(0, 1);
|
||||
if (t == "tpm-done") set(0, 2);
|
||||
if (t == "dot1x-active") set(1, 1);
|
||||
|
||||
Reference in New Issue
Block a user