fix(certs): stop the test suite bricking the container; make the pairing check real
Gate findings on fix/cert-write-safety. One blocker, one latent truncation
path, a false premise in a load-bearing comment, and a set of tests that were
passing without testing anything.
THE BLOCKER - scripts/test-cert-scripts.py bricked the production container
------------------------------------------------------------------------
The openssl-availability tests build a stripped PATH out of SYMLINKS to real
system binaries (cat, grep, mktemp, mv, cp, rm, mkdir, basename, dirname, find,
date, chmod). _cleanup_tmp() then walked the temp tree calling os.chmod(p,
0o600) - and os.chmod FOLLOWS SYMLINKS. Run once as root in the real image,
which is where this file ships (COPY scripts /haproxy/scripts) and where an
operator would most plausibly run it after deploying a cert fix, it stripped
the exec bit off twelve core binaries INCLUDING chmod itself, so it could not
be undone from inside the container:
/haproxy/scripts/cert-publish-lib.sh: line 109: /usr/bin/grep: Permission denied
bash: /usr/bin/chmod: Permission denied
Certificate publishing stayed dead until the container was recreated. It was
invisible on a workstation because an unprivileged chmod of a root-owned file
fails EPERM straight into `except OSError: pass` - which is also why the
advertised "32 tests pass" was only ever true off-container. In the image the
shipped file measured FAILED (failures=22, skipped=1). Cleanup now skips
symlinks; the suites are green in the image and the binaries survive.
S1 - the shell half had no same-filesystem guard
------------------------------------------------
The header claimed a cross-device mv would "FAIL LOUDLY and leave the live pem
alone". GNU mv does the opposite: across filesystems it copies, so it opens and
truncates the DESTINATION and only then discovers it cannot finish - measured
as a 204800-byte partial live.pem, sentinel gone, before mv reported ENOSPC.
cert_publish() now compares stat -Lc %d of the staging and certs dirs before
writing anything, mirroring the st_dev check the Python half already had, and
the comment says what mv actually does. Latent today (both dirs share a device
on all five hosts) but both are env-overridable.
openssl is present - correct the premise, make the check mandatory
------------------------------------------------------------------
Both halves justified a fail-open with "the image does not necessarily install
the openssl CLI". It does: openssl 3.5.6 in the running container, pulled in by
ca-certificates which certbot needs, and generate_self_signed_cert() already
shells to `openssl req` with check=True during setup. The 'unavailable' branch
never fired, so the pairing check has always run - and that, not the stated
reasoning, is what made the fail-open harmless. Structural validation alone is
weak: a bundle of EMPTY pem blocks passes every structural rule and is caught
only by openssl. The check is now mandatory in both halves and a missing binary
is a loud refusal. No `cryptography` fallback: the app runs on
/usr/local/bin/python3 (3.12) where it is not importable - it belongs to
Debian's /usr/bin/python3 - and reaching for that would be a second unverified
premise.
Smaller items
-------------
* cert_bundle_valid() read the file six times; a concurrent swap between two of
them made openssl x509 and openssl pkey judge different files and log a bogus
"private key does not match the certificate" into the monitored error log. It
now reads one snapshot and feeds openssl from it on stdin.
* except OSError -> except (OSError, UnicodeDecodeError): a BINARY-corrupt live
pem made backup_existing_pem() raise out of publish_pem_bundle() entirely, so
the republish that would have healed the host was the one thing that could
not run. The shell half recovers fine.
* stat -c %a on a symlinked live pem reports the LINK's 0777 and produced a
world-writable private key in the crt directory; now stat -Lc.
* The staging reaper's '*.??????' glob matched mktemp names but not the Python
side's '<name>.<random>.tmp', so those leaked forever. Matches both now.
* renew-certificates.sh and sync-certificates.sh exited 0 even when every
domain failed to publish, so "0 updated, 12 failed" looked identical to a
clean run to cron, to host-renew-certificates.sh (which branches on it) and
to monitoring - a host could silently stop publishing renewals until the
certificates expired. They now exit 1 if any domain failed, still after
publishing the ones that worked.
Test-quality
------------
Four TestCertPublishLibrary tests passed with cert-publish-lib.sh DELETED -
they asserted only rc != 0, and `command not found` is 127. All four now assert
the rejection REASON via assert_rejected(), and setUp() fails if the library is
missing. test_missing_openssl_still_rejects... is replaced by
test_empty_pem_blocks_are_rejected, which pins the case that makes the pairing
check necessary.
Also: the staging-containment test used startswith(certs + os.sep), so
cert_staging_dir() returning the crt directory ITSELF - the exact hazard -
still passed; test_successful_renewal_still_publishes built its "renewed" cert
with a no-op .replace() and could not tell a renewal that published nothing;
test_no_temp_file_survives_a_failed_publish failed before the staging dir
existed and asserted [] == []; FIX_ONLY was skipUnless(hasattr(hm,
'publish_pem_bundle')), so renaming that function turned 10 of 17 tests into
skips while the run still printed OK. Each is fixed and each fix is
mutation-proved: the mutation that the old assertion waved through now fails.
File mode is pinned in both suites (it was pinned nowhere), and the rename
failure is injected with a stub mv instead of chmod 0500, which root ignored -
so that test no longer skips itself precisely where it matters.
Verification
------------
IN THE BUILT IMAGE, as root (the acceptance bar):
scripts/test-cert-scripts.py 38 tests, OK, 0 skipped
scripts/test-cert-write-safety.py 22 tests, OK, 0 skipped
scripts/test-config-rollback.py 17 tests, OK (neighbour, unchanged)
Workstation: 38/38 OK for the shell suite; the Python suite needs flask.
Against the pre-fix tree (main): shell 38 failures; python failures=4, errors=1,
skipped=15 - the FIX_ONLY skips are the 14 fix-only tests plus the API guard.
The old python suite against the pre-fix tree measures skipped=10, confirming
the gate's count.
32 mutation checks, all behaving as intended: every fix breaks a test when
reverted, and every rewritten test fails under the mutation its predecessor
passed. py_compile clean, bash -n clean, shellcheck clean, no new pyflakes
warnings (same 4 pre-existing).
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5
+127
-50
@@ -33,9 +33,21 @@
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# staging: $(dirname $SSL_CERTS_DIR)/cert-staging [$CERT_STAGING_DIR]
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# backups: $(dirname $SSL_CERTS_DIR)/cert-backups [$CERT_BACKUP_DIR]
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# Both siblings of the certs dir, so they are on the same filesystem and the
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# final mv is a rename(2) - atomic. If the mv ever fails (EXDEV because someone
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# mounted the certs dir separately, permissions, ...) we FAIL LOUDLY and leave
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# the live pem alone. There is deliberately no "just write it directly" path.
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# final mv is a rename(2) - atomic. There is deliberately no "just write it
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# directly into the certs dir" fallback path.
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#
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# The same-filesystem property is CHECKED, not assumed (see cert_publish step
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# (c)). An earlier revision of this comment claimed a cross-device mv would
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# "fail loudly and leave the live pem alone". It does not: GNU mv falls back to
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# copy-then-unlink across filesystems, so it OPENS THE DESTINATION FOR WRITING
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# and only then discovers it cannot finish - e.g. with a full destination
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# filesystem the live pem is already overwritten when mv reports failure. That
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# is precisely the truncation this library exists to prevent, so the device
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# numbers of the staging dir and the certs dir are compared with stat(1) before
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# anything is written, and a mismatch aborts the publish. Both directories are
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# env-overridable ($CERT_STAGING_DIR / $SSL_CERTS_DIR), so "they are siblings"
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# is not something the code can take on faith. This mirrors the explicit
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# st_dev check in publish_pem_bundle() on the Python side.
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# Logging: the callers define their own log_info/log_error. Only provide
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# fallbacks so this library is usable standalone (e.g. from a test or a shell).
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@@ -72,23 +84,37 @@ cert_backup_dir() {
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#
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# Returns 0 if FILE is publishable as an HAProxy pem bundle.
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#
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# Layer 1 (MANDATORY, pure shell/grep, always available): structural checks.
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# A missing or failed structural check is a HARD FAIL. This layer is
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# what actually covers the truncation / partial-write / key-less
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# failure modes this library exists to prevent.
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# Layer 2 (BEST EFFORT): cryptographic pairing via the openssl CLI.
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# If openssl runs and says the cert and key do not match, that is a
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# HARD FAIL. If the openssl BINARY IS ABSENT we log a loud warning and
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# accept the bundle on the structural checks alone.
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# Layer 1 (structure, pure shell/grep): covers the truncation / partial-write /
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# key-less failure modes this library exists to prevent.
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# Layer 2 (cryptographic pairing via the openssl CLI): covers what layer 1
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# cannot see. Structural checks are weak on their own - a bundle of
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# EMPTY pem blocks ("-----BEGIN CERTIFICATE-----" immediately followed
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# by "-----END CERTIFICATE-----") satisfies every grep below and is
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# caught only by openssl.
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#
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# Rationale for not hard-failing on a missing checker: the container
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# image (see Dockerfile) installs haproxy, certbot and socat, but not
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# necessarily the openssl CLI. Refusing to publish when the checker is
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# missing would stall every renewal fleet-wide and let certificates
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# expire - a guaranteed outage - which is strictly worse than the risk
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# it prevents, since a mismatched pair can only arise from a
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# mis-assembled source tree, whereas the truncation modes we are
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# actually defending against are fully covered by layer 1.
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# BOTH LAYERS ARE MANDATORY. An absent openssl binary is a hard failure, not a
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# skip.
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#
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# The previous revision made layer 2 best-effort and justified it with "the
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# container image installs haproxy, certbot and socat, but not necessarily the
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# openssl CLI". That premise is false. openssl 3.x is present in the image: it
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# is a dependency of ca-certificates, which certbot needs, and
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# generate_self_signed_cert() in haproxy_manager.py shells out to `openssl req`
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# with check=True during first-run setup, so a container that reached the point
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# of publishing a bundle has always had it. The "unavailable" branch therefore
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# never fired in production, which means the fail-open was safe only by
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# accident - and a comment that justifies a decision on a false premise is
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# worse than no comment, because the next person extends the reasoning.
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#
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# Making it mandatory does mean a hypothetical image without openssl stops
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# publishing renewals. That is the right trade: it fails immediately and
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# loudly, into the monitored error log, on the first renewal run, whereas
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# publishing an unpaired or empty-block bundle takes the whole :443 bind (i.e.
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# every site on the host) down at the next reload. There is deliberately no
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# python `cryptography` fallback: the app runs on /usr/local/bin/python3 (the
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# base image's 3.12), where cryptography is NOT importable - it is installed
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# for Debian's /usr/bin/python3 as a certbot dependency. Coding to a hardcoded
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# /usr/bin/python3 would just be a second unverified premise.
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cert_bundle_valid() {
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local file="$1"
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@@ -100,55 +126,71 @@ cert_bundle_valid() {
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log_error "Certificate bundle $file does not exist (or is not a regular file)"
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return 1
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fi
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if [ ! -s "$file" ]; then
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# openssl is checked BEFORE any content check so a broken image is reported
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# as a broken image rather than as a bad certificate.
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if ! command -v openssl >/dev/null 2>&1; then
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log_error "openssl binary not found - REFUSING to publish $file." \
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"The cert/key pairing check (openssl x509 -pubkey vs openssl pkey -pubout)" \
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"is mandatory; structural checks alone cannot tell a real bundle from" \
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"empty pem blocks. Install openssl in this image."
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return 1
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fi
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# Read the file ONCE and run every check against that snapshot.
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#
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# This used to open $file six times (two [ ] tests, three greps, two
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# openssl invocations). cert_bundle_valid() is called on the LIVE pem in
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# cert_publish() step (d), where a concurrent publisher can replace it
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# between two of those opens - each open then sees a different file. The
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# observable symptom was a spurious "private key does not match the
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# certificate" ERROR in the monitored error log for a pair that was fine:
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# openssl x509 read the old bundle and openssl pkey the new one.
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local content
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if ! content="$(cat -- "$file" 2>/dev/null)"; then
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log_error "Certificate bundle $file could not be read"
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return 1
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fi
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if [ -z "$content" ]; then
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log_error "Certificate bundle $file is empty"
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return 1
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fi
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# --- layer 1: structure -------------------------------------------------
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if ! grep -qF -- '-----BEGIN CERTIFICATE-----' "$file"; then
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if ! grep -qF -- '-----BEGIN CERTIFICATE-----' <<< "$content"; then
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log_error "Certificate bundle $file contains no certificate block"
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return 1
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fi
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if ! grep -qF -- '-----END CERTIFICATE-----' "$file"; then
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if ! grep -qF -- '-----END CERTIFICATE-----' <<< "$content"; then
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log_error "Certificate bundle $file has an unterminated certificate block (truncated?)"
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return 1
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fi
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local key_begin key_end
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key_begin="$(grep -m1 -oE -- '-----BEGIN (RSA |EC )?PRIVATE KEY-----' "$file")"
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key_begin="$(grep -m1 -oE -- '-----BEGIN (RSA |EC )?PRIVATE KEY-----' <<< "$content")"
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if [ -z "$key_begin" ]; then
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log_error "Certificate bundle $file contains no private key block"
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return 1
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fi
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key_end="${key_begin/BEGIN/END}"
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if ! grep -qF -- "$key_end" "$file"; then
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if ! grep -qF -- "$key_end" <<< "$content"; then
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log_error "Certificate bundle $file has an unterminated private key block (truncated?)"
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return 1
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fi
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# --- layer 2: cert/key pairing ------------------------------------------
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if ! command -v openssl >/dev/null 2>&1; then
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# Once per process: this fires per domain otherwise, and a renewal run
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# walks every certificate on the host.
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if [ -z "${_CERT_OPENSSL_WARNED:-}" ]; then
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_CERT_OPENSSL_WARNED=1
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log_warn "openssl binary not found - SKIPPING the cert/key pairing check" \
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"(openssl x509 -pubkey vs openssl pkey -pubout);" \
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"certificate bundles are being published on structural checks alone"
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fi
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return 0
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fi
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# Fed from the same snapshot on stdin (openssl reads stdin when -in is
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# omitted) rather than re-opening $file, so layer 2 judges exactly the
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# bytes layer 1 judged. -passin pass: means an encrypted key fails fast
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# instead of prompting - a passphrase prompt in a cron job is a hang, not
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# an error.
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local cert_pub key_pub
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# </dev/null on both: openssl pkey prompts for a passphrase on an encrypted
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# key, and a prompt in a cron job is a hang, not an error.
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if ! cert_pub="$(openssl x509 -in "$file" -noout -pubkey 2>/dev/null </dev/null)" \
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if ! cert_pub="$(openssl x509 -noout -pubkey 2>/dev/null <<< "$content")" \
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|| [ -z "$cert_pub" ]; then
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log_error "Certificate bundle $file: openssl could not read the certificate"
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return 1
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fi
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if ! key_pub="$(openssl pkey -in "$file" -pubout -passin pass: 2>/dev/null </dev/null)" \
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if ! key_pub="$(openssl pkey -pubout -passin pass: 2>/dev/null <<< "$content")" \
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|| [ -z "$key_pub" ]; then
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log_error "Certificate bundle $file: openssl could not read the private key"
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return 1
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@@ -174,7 +216,7 @@ cert_publish() {
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fi
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local cert_file="$1" key_file="$2" dest_file="$3"
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local staging_dir backup_dir tmp base
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local staging_dir backup_dir dest_dir tmp base
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# (a) sources must exist and be non-empty before we touch anything.
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if [ ! -s "$cert_file" ]; then
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@@ -189,13 +231,42 @@ cert_publish() {
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# (b) assemble in the staging dir - NOT in the certs dir, which HAProxy
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# scans wholesale.
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staging_dir="$(cert_staging_dir)"
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if ! mkdir -p "$staging_dir"; then
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log_error "cert_publish: cannot create staging directory $staging_dir"
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dest_dir="$(dirname "$dest_file")"
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if ! mkdir -p "$staging_dir" || ! mkdir -p "$dest_dir"; then
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log_error "cert_publish: cannot create staging directory $staging_dir or destination directory $dest_dir"
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return 1
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fi
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# Sweep temps orphaned by a kill -9 / OOM in an earlier run. Restricted to
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# the mktemp suffix shape inside our own staging dir.
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find "$staging_dir" -maxdepth 1 -type f -name '*.??????' -mmin +1440 -delete 2>/dev/null
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# (c) the final swap is `mv`, which is only a rename(2) - and therefore only
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# atomic - within one filesystem. Across filesystems GNU mv copies:
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# it truncates and writes the DESTINATION, then unlinks the source, so a
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# failure part-way through (ENOSPC is the realistic one) leaves exactly
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# the half-written live pem this library exists to prevent. Both paths
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# are env-overridable, so check instead of assuming. Same check as the
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# st_dev comparison in publish_pem_bundle() on the Python side.
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local staging_dev dest_dev
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staging_dev="$(stat -Lc '%d' "$staging_dir" 2>/dev/null)"
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dest_dev="$(stat -Lc '%d' "$dest_dir" 2>/dev/null)"
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if [ -z "$staging_dev" ] || [ -z "$dest_dev" ]; then
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log_error "cert_publish: cannot stat $staging_dir and/or $dest_dir - refusing to publish $dest_file"
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return 1
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fi
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if [ "$staging_dev" != "$dest_dev" ]; then
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log_error "cert_publish: staging dir $staging_dir and destination dir $dest_dir" \
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"are on different filesystems, so the bundle cannot be swapped in atomically." \
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"Refusing to publish $dest_file (live file left untouched);" \
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"point CERT_STAGING_DIR at a directory on the same filesystem as $dest_dir"
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return 1
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fi
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# Sweep temps orphaned by a kill -9 / OOM in an earlier run. Two shapes,
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# because two publishers share this directory: mktemp's six-X suffix from
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# this library, and `<name>.<random>.tmp` from write_config_atomically() on
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# the Python side (tempfile.mkstemp(prefix=name + '.', suffix='.tmp')).
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# Matching only the mktemp shape - as this did - left every Python-side
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# temp behind forever.
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find "$staging_dir" -maxdepth 1 -type f \
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\( -name '*.??????' -o -name '*.tmp' \) -mmin +1440 -delete 2>/dev/null
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base="$(basename "$dest_file")"
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tmp="$(mktemp "${staging_dir}/${base}.XXXXXX" 2>/dev/null)"
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@@ -218,14 +289,14 @@ cert_publish() {
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return 1
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fi
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# (c) never promote something HAProxy would choke on.
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# (d) never promote something HAProxy would choke on.
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if ! cert_bundle_valid "$tmp"; then
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log_error "cert_publish: assembled bundle for $dest_file failed validation (live file left untouched)"
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rm -f "$tmp"
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return 1
|
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fi
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# (d) back up the bundle we are about to replace - but only if it is itself
|
||||
# (e) back up the bundle we are about to replace - but only if it is itself
|
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# valid. Overwriting a good backup with garbage would turn "restore the
|
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# backup" into "restore a different broken file". Same semantics as
|
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# create_backup(require_valid=True) in haproxy_manager.py.
|
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@@ -252,12 +323,18 @@ cert_publish() {
|
||||
# who can read these files is not something a write-safety fix should do as
|
||||
# a side effect - and it must match write_config_atomically() on the Python
|
||||
# side, which preserves the mode the same way.
|
||||
#
|
||||
# -L (follow symlinks) matters: stat without it reports the mode of the
|
||||
# SYMLINK, which is 0777 on Linux and is not a permission at all. A live
|
||||
# pem that is a symlink therefore produced a world-WRITABLE 0777 private
|
||||
# key sitting in the crt directory. With -L we copy the mode of the file
|
||||
# the link points at, which is the mode an operator actually chose.
|
||||
local mode
|
||||
mode="$(stat -c '%a' "$dest_file" 2>/dev/null)"
|
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mode="$(stat -Lc '%a' "$dest_file" 2>/dev/null)"
|
||||
[ -n "$mode" ] || mode=644
|
||||
chmod "$mode" "$tmp" 2>/dev/null
|
||||
|
||||
# (e) atomic swap. Same filesystem by construction; if it still fails,
|
||||
# (f) atomic swap. Same filesystem, verified in (c); if it still fails,
|
||||
# stop - do not fall back to writing into the certs dir.
|
||||
if ! mv -f "$tmp" "$dest_file"; then
|
||||
log_error "cert_publish: failed to move $tmp into place as $dest_file" \
|
||||
|
||||
@@ -108,5 +108,18 @@ if [ $UPDATED -gt 0 ]; then
|
||||
fi
|
||||
fi
|
||||
|
||||
# A per-domain publication failure is a real failure and must be reported as
|
||||
# one. This script used to `exit 0` no matter how many domains failed, so
|
||||
# "0 updated, 12 failed" - a host that has completely stopped publishing
|
||||
# renewals - looked identical to a clean run to cron, to
|
||||
# host-renew-certificates.sh (which branches on this exit code) and to any
|
||||
# external monitoring. The first visible symptom would have been certificates
|
||||
# expiring. The loop above deliberately continues past a failed domain so the
|
||||
# others still get published; the status is reported here instead.
|
||||
if [ "$FAILED" -gt 0 ]; then
|
||||
log_error "Certificate renewal process completed with failures: $UPDATED updated, $FAILED failed"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
log_info "Certificate renewal process completed"
|
||||
exit 0
|
||||
|
||||
@@ -90,5 +90,12 @@ if [ $UPDATED -gt 0 ]; then
|
||||
fi
|
||||
fi
|
||||
|
||||
# See the matching block in renew-certificates.sh: a run in which every domain
|
||||
# failed to publish must not look like a clean run to its caller.
|
||||
if [ "$FAILED" -gt 0 ]; then
|
||||
log_error "Certificate sync process completed with failures: $UPDATED updated, $FAILED failed"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
log_info "Certificate sync process completed"
|
||||
exit 0
|
||||
|
||||
+364
-42
@@ -41,16 +41,26 @@ binaries on PATH.
|
||||
|
||||
The certificate material below is a real self-signed test certificate with its
|
||||
matching key (plus a second, unrelated key for the mismatch case), embedded as
|
||||
constants so the tests need no openssl to *create* material. The one test that
|
||||
needs openssl to *verify* pairing skips itself if the binary is absent.
|
||||
constants so the tests need no openssl to *create* material. openssl IS needed
|
||||
to run them: the library's cert/key pairing check is mandatory (it is the only
|
||||
layer that can reject a bundle of empty pem blocks), so without the binary
|
||||
every publish is refused by design. The image ships openssl 3.x.
|
||||
|
||||
The acceptance bar for this file is a green run INSIDE the built image, as
|
||||
root, which is where these scripts actually execute - not on a workstation.
|
||||
Several failure modes are invisible outside the container (root ignores the
|
||||
directory permissions one test used to rely on) and one was actively
|
||||
destructive there; see _cleanup_tmp().
|
||||
"""
|
||||
|
||||
import os
|
||||
import re
|
||||
import shutil
|
||||
import stat
|
||||
import subprocess
|
||||
import tempfile
|
||||
import textwrap
|
||||
import time
|
||||
import unittest
|
||||
|
||||
MODULE_DIR = os.path.abspath(
|
||||
@@ -152,11 +162,72 @@ FV0RvuQPDYkqsx8ibqpSv7c=
|
||||
-----END PRIVATE KEY-----
|
||||
"""
|
||||
|
||||
# A SECOND, unrelated but internally consistent pair. Needed by the
|
||||
# concurrency test: two bundles that are each perfectly valid but whose keys
|
||||
# differ, so a validator that reads the certificate from one and the key from
|
||||
# the other reports a mismatch. Two bundles sharing key material - which is
|
||||
# what PREVIOUS_BUNDLE and NEW_BUNDLE are - cannot detect that at all.
|
||||
# openssl req -x509 -newkey rsa:2048 -nodes -days 3650 \
|
||||
# -subj /CN=second.example.com
|
||||
TEST_CERT_2 = """\
|
||||
-----BEGIN CERTIFICATE-----
|
||||
MIIDGzCCAgOgAwIBAgIUKQAAvrVkden7gIg2zYMLb6dO1c8wDQYJKoZIhvcNAQEL
|
||||
BQAwHTEbMBkGA1UEAwwSc2Vjb25kLmV4YW1wbGUuY29tMB4XDTI2MDgwNjE2NTcz
|
||||
NVoXDTM2MDgwMzE2NTczNVowHTEbMBkGA1UEAwwSc2Vjb25kLmV4YW1wbGUuY29t
|
||||
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2pfTOvN2zrZJ6d+biiD
|
||||
VOczMqanuHPBCy2CnTBif+7VWf8AaywRzQ3ShfhmalVRNEFMn0MSO+GocmH71Ve1
|
||||
nl89oGiJPmvX1lpncbgM692ddhP9ez4xUeNj+QAWp9VBZhInNuM4Pawv5BPngtpj
|
||||
2MGXf3ZlBSli8Ng7jBo1fTMT3bh8GcE1rIPRvmUuQwFIt2eGnLR8jQd+xGelhAjG
|
||||
nnXtlc+ebo4r2OjljNgvtdUknBZdpiZXmjdFzyClYTeMuEen2uwMpJNc0wLbRjcU
|
||||
khVF3nw4jUnkOhWH3JYGAoWslJyEqZSANwt/eOHwXgyVuxg31bCl297iskW0IRZL
|
||||
wQIDAQABo1MwUTAdBgNVHQ4EFgQU7HH8GacJzc2j9s2UJCPwykgrIckwHwYDVR0j
|
||||
BBgwFoAU7HH8GacJzc2j9s2UJCPwykgrIckwDwYDVR0TAQH/BAUwAwEB/zANBgkq
|
||||
hkiG9w0BAQsFAAOCAQEAYE5jHX1dK091jVsFSZDdiw9AU5rrk8XpF1yuPmDisRnE
|
||||
dJ4QQq3dzWXRnp0bzZnq7fdfiEz1m39zVixov7WFp24QhenD2n5K7/wew7RpXTnA
|
||||
pAGBEdsGvBJ+3MgkRYklXCM9f9f4z21xXRNZ+BwBcM25D+gR4b+PRMQR6BhZx5R+
|
||||
y2jQsoM68cFjRApFWgmji4pBjg/eOaZMBCfVTjP+npVyqG7UtV5EyYXwPgPa/rm2
|
||||
FoP+eftzP6dszBEonkIVyyvkdscI4Wkr8hw3S0R/TP8l9lTnvN1HC3o7Es5VY53R
|
||||
swNAXWBlgm0N7A96ISLtQjgvOfeMRTCSjxW9pm0wJA==
|
||||
-----END CERTIFICATE-----
|
||||
"""
|
||||
|
||||
TEST_KEY_2 = """\
|
||||
-----BEGIN PRIVATE KEY-----
|
||||
MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQC/al9M683bOtkn
|
||||
p35uKINU5zMypqe4c8ELLYKdMGJ/7tVZ/wBrLBHNDdKF+GZqVVE0QUyfQxI74ahy
|
||||
YfvVV7WeXz2gaIk+a9fWWmdxuAzr3Z12E/17PjFR42P5ABan1UFmEic24zg9rC/k
|
||||
E+eC2mPYwZd/dmUFKWLw2DuMGjV9MxPduHwZwTWsg9G+ZS5DAUi3Z4actHyNB37E
|
||||
Z6WECMaede2Vz55ujivY6OWM2C+11SScFl2mJleaN0XPIKVhN4y4R6fa7Aykk1zT
|
||||
AttGNxSSFUXefDiNSeQ6FYfclgYChayUnISplIA3C3944fBeDJW7GDfVsKXb3uKy
|
||||
RbQhFkvBAgMBAAECggEABQLqy6eedRPt31sLOMFEDkzbZdFHOMpZeuqThsNmjo7z
|
||||
t9diokgeD4ZQXimbEQqsZYDAtmFGdiEp86I9JQBk/4TUiqFhHrOADBe1jQAptjfs
|
||||
iyIb51gIPnjZ1RBA5Al8zohy28T9h1+Z7+/OeCvcgLyVAixf/U9pU8D1El9cu9zv
|
||||
4q4WJPB5Tgkq+YwcmeuT8LzsKoSDmPQjFVY9v+gz6hoVUVyP6gswnlFnKjNcmfZU
|
||||
0CKP90sCAc5mKZv7RyGG920LDU4u2ggnQoK05GhXK8R3amJmoAF3i+xGeTRvNEKe
|
||||
wDC7NinTG2WDVo6y/FCvFKs0+qqlKww1u39fq166rQKBgQDtjPjvkDkSYFcWFznn
|
||||
sfsxN5R1cLpxdutLZhfvtpHIj5NkQbmOk0r3LbDAwU+UNVQ6F8jWQVHUsni9jAY6
|
||||
3RNRF4ZabC51aqg/Ssj7d5mE4kj7y6Ch/nnSXIogRxLG4bWo2rtG1M2Dt3Ef08R4
|
||||
6gjcp9ZmELyVx7H4yXFJGIaDdQKBgQDOSCHFK/ggZzzy4iC7DOq1lrbR+jyk95rh
|
||||
F5EGzyAkgJ4uYc9TCPkUDxXjWL17r61/obfbW4znaV9fHEKpz3R54osDXln3oLea
|
||||
BBWkJI3ANe8iNrGDE4FN9to4DdUMFsWX/WEiRyBPIqDy9DTyadblMLTNZjNPuLmg
|
||||
ZJOB3tRZnQKBgQCjeglya9Eq2Uv1MuSxk2VnmHU9YOed4BXLHKZKXFz1JgFr1GNL
|
||||
QAguFK536FDIkO62z9lxwR/8fRnkb7F13uBFRSg7oAlU2qKQc/nePI9UyJkrVxXj
|
||||
hYn2f6K61c6ROZFXc7e/5gDMrXhXS9gA0iZpG8PLF6eAeB39NTwV7p/bZQKBgQCV
|
||||
v5eEY58FJu0ABVhtcbsRiA+/70EHIRi2Pz1xC/vxg81RLoArb2AiR7FEEa+8kpQJ
|
||||
C4VFIPjxJXWuvf1G+Os9cFAqadw1/95JWJ29QywEVSL8W2gSF57O0l0oRCJdXEql
|
||||
Q7O4BppV2HWu6clmEZ+HUgxu77pgLWHUJi9PIExXoQKBgEq6rYBXmsSQermnPTOn
|
||||
YFx7c2ns97hsjYIbs497+gPW4/xQWwsN76t60SWqjXV4DHJCpi5Tnjo2fk5/OzK+
|
||||
HfshC9CKFDk8T0KGQWwaPwqP/OYbqOA88IlJ7xbPdSuJkjefHCtVVEtao6+HNgzm
|
||||
lniLtDMpU0MLPgB98ClQ4HDA
|
||||
-----END PRIVATE KEY-----
|
||||
"""
|
||||
|
||||
# The bundle already on disk when a run starts. Same key material, plus a
|
||||
# trailing marker so "the live file was replaced" and "the old file was
|
||||
# archived" can be told apart byte-for-byte.
|
||||
PREVIOUS_BUNDLE = TEST_CERT + TEST_KEY + '# previous bundle\n'
|
||||
NEW_BUNDLE = TEST_CERT + TEST_KEY
|
||||
OTHER_BUNDLE = TEST_CERT_2 + TEST_KEY_2
|
||||
|
||||
# --- stub binaries -----------------------------------------------------------
|
||||
STUB_CERTBOT = """\
|
||||
@@ -216,6 +287,12 @@ class CertScriptFixture(unittest.TestCase):
|
||||
"""An isolated fake /etc/haproxy + /etc/letsencrypt plus stub binaries."""
|
||||
|
||||
def setUp(self):
|
||||
# Without the library every "the library rejects X" assertion in this
|
||||
# file can be satisfied by bash exiting 127, so make its absence a
|
||||
# failure of every test rather than a silent pass of several.
|
||||
self.assertTrue(os.path.isfile(LIB),
|
||||
f'{LIB} is missing - nothing below tests anything')
|
||||
|
||||
self.tmp = tempfile.mkdtemp(prefix='haproxy-cert-test-')
|
||||
self.addCleanup(self._cleanup_tmp)
|
||||
|
||||
@@ -246,11 +323,28 @@ class CertScriptFixture(unittest.TestCase):
|
||||
self.error_log = os.path.join(self.tmp, 'haproxy-manager-errors.log')
|
||||
|
||||
def _cleanup_tmp(self):
|
||||
# A test may have chmod 000'd a fixture file.
|
||||
# A test may have chmod 000'd a fixture file, which would stop rmtree.
|
||||
#
|
||||
# SYMLINKS ARE SKIPPED, and that is not a nicety. os.chmod() FOLLOWS
|
||||
# symlinks, and the openssl-availability tests below build a stripped
|
||||
# PATH directory out of symlinks to real system binaries (/usr/bin/cat,
|
||||
# /usr/bin/chmod, ...). Walking those with chmod 0600 as root - which is
|
||||
# how this container runs - stripped the exec bit from a dozen core
|
||||
# binaries of the machine running the tests, chmod itself included, so
|
||||
# it could not even be undone from inside the container: every later
|
||||
# test failed with "/usr/bin/grep: Permission denied" and certificate
|
||||
# publishing stayed dead until the container was recreated. It never
|
||||
# showed up on a workstation because an unprivileged chmod of a
|
||||
# root-owned file fails EPERM and was swallowed by `except OSError`.
|
||||
# This file ships in the image (COPY scripts /haproxy/scripts), so
|
||||
# running it in place is a thing an operator will do.
|
||||
for root, dirs, files in os.walk(self.tmp):
|
||||
for name in files:
|
||||
path = os.path.join(root, name)
|
||||
if os.path.islink(path):
|
||||
continue
|
||||
try:
|
||||
os.chmod(os.path.join(root, name), 0o600)
|
||||
os.chmod(path, 0o600)
|
||||
except OSError:
|
||||
pass
|
||||
shutil.rmtree(self.tmp, ignore_errors=True)
|
||||
@@ -310,6 +404,27 @@ class CertScriptFixture(unittest.TestCase):
|
||||
self.assertEqual(sorted(os.listdir(self.staging_dir)), [],
|
||||
'staging file was not cleaned up')
|
||||
|
||||
def assert_rejected(self, result, because):
|
||||
"""The library refused, FOR THE STATED REASON.
|
||||
|
||||
`assertNotEqual(rc, 0)` on its own proves nothing about this library.
|
||||
Delete cert-publish-lib.sh and `. "$1"` fails, cert_bundle_valid is
|
||||
never defined, bash exits 127 - and a bare rc!=0 assertion passes. Four
|
||||
tests in TestCertPublishLibrary were doing exactly that; they were
|
||||
pinning "some bash pipeline failed", not "the bundle was rejected".
|
||||
"""
|
||||
output = result.stdout + result.stderr
|
||||
self.assertNotIn('command not found', output,
|
||||
'the shell could not find the function under test - '
|
||||
'this asserts nothing about the library')
|
||||
self.assertNotEqual(127, result.returncode,
|
||||
f'exit 127 means "no such command", not "rejected": {output}')
|
||||
self.assertNotEqual(0, result.returncode,
|
||||
f'expected a rejection, got success: {output}')
|
||||
self.assertIn(because, output,
|
||||
f'rejected, but not for the expected reason '
|
||||
f'({because!r} not in output): {output}')
|
||||
|
||||
|
||||
class CertScriptBehaviour:
|
||||
"""Behaviour shared by renew-certificates.sh and sync-certificates.sh.
|
||||
@@ -378,8 +493,17 @@ class CertScriptBehaviour:
|
||||
'HAProxy was reloaded even though nothing was updated')
|
||||
self.assert_certs_dir_is_clean()
|
||||
self.assert_no_staging_leftovers()
|
||||
self.assertEqual(result.returncode, 0,
|
||||
'a per-domain failure should not change the exit code')
|
||||
# This used to assert returncode == 0 with the comment "a per-domain
|
||||
# failure should not change the exit code", codifying the script's
|
||||
# `exit 0`. That is wrong and it is the dangerous kind of wrong: a host
|
||||
# where EVERY domain fails to publish looked, to cron and to
|
||||
# host-renew-certificates.sh (which branches on this exit code),
|
||||
# exactly like a clean run. Nothing would notice until the certificates
|
||||
# expired. Continuing past a failed domain so the others still get
|
||||
# published is right; reporting success afterwards is not.
|
||||
self.assertNotEqual(result.returncode, 0,
|
||||
'a domain that failed to publish must be reported '
|
||||
'in the exit code, not just in the log')
|
||||
|
||||
def break_source_key(self):
|
||||
"""Make reading the source key fail, however this environment allows.
|
||||
@@ -424,8 +548,9 @@ class CertScriptBehaviour:
|
||||
|
||||
def test_mismatched_key_is_rejected(self):
|
||||
if shutil.which('openssl') is None:
|
||||
self.skipTest('openssl CLI not available: the cert/key pairing '
|
||||
'check is best-effort and is skipped by design')
|
||||
self.skipTest('openssl CLI not available: without it every publish '
|
||||
'is refused, so this test could not tell a pairing '
|
||||
'rejection from a missing-checker rejection')
|
||||
self.seed_previous_bundle()
|
||||
before = read(self.live_pem)
|
||||
write(self.src_key, UNRELATED_KEY)
|
||||
@@ -504,10 +629,10 @@ class TestSyncCertificates(CertScriptBehaviour, CertScriptFixture):
|
||||
class TestCertPublishLibrary(CertScriptFixture):
|
||||
"""Unit-level checks on cert-publish-lib.sh itself."""
|
||||
|
||||
def call(self, snippet, *args):
|
||||
def call(self, snippet, *args, **env_overrides):
|
||||
return subprocess.run(
|
||||
['bash', '-c', '. "$1"; shift; ' + snippet, '_', LIB, *args],
|
||||
env=self.env(), capture_output=True, text=True)
|
||||
env=self.env(**env_overrides), capture_output=True, text=True)
|
||||
|
||||
def test_valid_bundle_accepted(self):
|
||||
path = write(os.path.join(self.tmp, 'ok.pem'), NEW_BUNDLE)
|
||||
@@ -515,14 +640,32 @@ class TestCertPublishLibrary(CertScriptFixture):
|
||||
|
||||
def test_empty_and_missing_bundles_rejected(self):
|
||||
empty = write(os.path.join(self.tmp, 'empty.pem'), '')
|
||||
self.assertNotEqual(self.call('cert_bundle_valid "$1"', empty).returncode, 0)
|
||||
self.assert_rejected(self.call('cert_bundle_valid "$1"', empty),
|
||||
'is empty')
|
||||
missing = os.path.join(self.tmp, 'nope.pem')
|
||||
self.assertNotEqual(self.call('cert_bundle_valid "$1"', missing).returncode, 0)
|
||||
self.assert_rejected(self.call('cert_bundle_valid "$1"', missing),
|
||||
'does not exist')
|
||||
|
||||
def test_key_without_end_marker_rejected(self):
|
||||
truncated = write(os.path.join(self.tmp, 'cut.pem'),
|
||||
TEST_CERT + '-----BEGIN PRIVATE KEY-----\nMIIEvAIB\n')
|
||||
self.assertNotEqual(self.call('cert_bundle_valid "$1"', truncated).returncode, 0)
|
||||
self.assert_rejected(self.call('cert_bundle_valid "$1"', truncated),
|
||||
'unterminated private key block')
|
||||
|
||||
def test_empty_pem_blocks_are_rejected(self):
|
||||
"""Why the pairing check is mandatory rather than best-effort.
|
||||
|
||||
Every structural check in the library passes on this file: a complete
|
||||
CERTIFICATE block and a complete PRIVATE KEY block, both with nothing
|
||||
between BEGIN and END. Only openssl can tell it is not a certificate.
|
||||
"""
|
||||
hollow = write(os.path.join(self.tmp, 'hollow.pem'),
|
||||
'-----BEGIN CERTIFICATE-----\n'
|
||||
'-----END CERTIFICATE-----\n'
|
||||
'-----BEGIN PRIVATE KEY-----\n'
|
||||
'-----END PRIVATE KEY-----\n')
|
||||
self.assert_rejected(self.call('cert_bundle_valid "$1"', hollow),
|
||||
'openssl could not read the certificate')
|
||||
|
||||
def test_a_broken_live_pem_does_not_overwrite_a_good_backup(self):
|
||||
"""Mirrors create_backup(require_valid=True) in haproxy_manager.py.
|
||||
@@ -544,37 +687,218 @@ class TestCertPublishLibrary(CertScriptFixture):
|
||||
'a good backup was overwritten with an unusable pem')
|
||||
|
||||
def test_publish_fails_loudly_when_the_rename_cannot_happen(self):
|
||||
"""No silent fallback to writing straight into the certs dir."""
|
||||
"""No silent fallback to writing straight into the certs dir.
|
||||
|
||||
The failure is injected with a stub `mv` that refuses, rather than by
|
||||
chmod 0500 on the certs dir: the container these scripts run in is
|
||||
root, root ignores directory permissions, so the chmod version skipped
|
||||
itself exactly where it matters and only ever ran on a workstation.
|
||||
"""
|
||||
self.seed_previous_bundle()
|
||||
before = read(self.live_pem)
|
||||
os.chmod(self.certs_dir, 0o500) # no writes: mv will fail
|
||||
self.addCleanup(os.chmod, self.certs_dir, 0o755)
|
||||
if os.geteuid() == 0:
|
||||
self.skipTest('root ignores directory permissions')
|
||||
write(os.path.join(self.bindir, 'mv'),
|
||||
"#!/bin/sh\n"
|
||||
"echo \"mv: cannot move '$2': Permission denied\" >&2\n"
|
||||
"exit 1\n", 0o755)
|
||||
self.addCleanup(os.unlink, os.path.join(self.bindir, 'mv'))
|
||||
|
||||
result = self.call('cert_publish "$1" "$2" "$3"',
|
||||
self.src_cert, self.src_key, self.live_pem)
|
||||
|
||||
self.assertNotEqual(result.returncode, 0,
|
||||
'a failed rename was reported as success')
|
||||
self.assert_rejected(result, 'NOT falling back to a direct write')
|
||||
self.assertEqual(read(self.live_pem), before,
|
||||
'the live pem was damaged by a failed rename')
|
||||
self.assert_no_staging_leftovers()
|
||||
|
||||
def test_published_pem_keeps_the_mode_of_the_file_it_replaces(self):
|
||||
"""A write-safety fix must not silently re-permission private keys.
|
||||
|
||||
Both directions matter: mktemp stages at 0600, so without the explicit
|
||||
chmod every publish would tighten a 0644 bundle; and the mode must not
|
||||
be copied from a symlink (see the next test).
|
||||
"""
|
||||
for mode in (0o644, 0o640, 0o600):
|
||||
with self.subTest(oct(mode)):
|
||||
write(self.live_pem, PREVIOUS_BUNDLE, mode)
|
||||
result = self.call('cert_publish "$1" "$2" "$3"',
|
||||
self.src_cert, self.src_key, self.live_pem)
|
||||
self.assertEqual(result.returncode, 0,
|
||||
result.stdout + result.stderr)
|
||||
self.assertEqual(read(self.live_pem), NEW_BUNDLE)
|
||||
self.assertEqual(
|
||||
stat.S_IMODE(os.stat(self.live_pem).st_mode), mode,
|
||||
'publishing changed who can read the private key')
|
||||
|
||||
def test_symlinked_live_pem_does_not_become_world_writable(self):
|
||||
"""`stat -c %a` on a symlink reports 0777 - the LINK's mode, not a
|
||||
permission. Copying that onto the staged bundle put a world-writable
|
||||
private key in the directory HAProxy serves from. -L is what makes the
|
||||
preserved mode the mode of the file an operator actually chose.
|
||||
"""
|
||||
target = write(os.path.join(self.tmp, 'real-bundle.pem'),
|
||||
PREVIOUS_BUNDLE, 0o640)
|
||||
os.symlink(target, self.live_pem)
|
||||
|
||||
result = self.call('cert_publish "$1" "$2" "$3"',
|
||||
self.src_cert, self.src_key, self.live_pem)
|
||||
|
||||
self.assertEqual(result.returncode, 0, result.stdout + result.stderr)
|
||||
mode = stat.S_IMODE(os.stat(self.live_pem).st_mode)
|
||||
self.assertEqual(
|
||||
0, mode & 0o022,
|
||||
f'published bundle is group/world writable ({oct(mode)}) - the '
|
||||
f'symlink mode was copied onto a real private key')
|
||||
self.assertEqual(0o640, mode)
|
||||
|
||||
def test_publish_refuses_when_staging_is_on_another_filesystem(self):
|
||||
"""The header used to claim a cross-device mv "fails loudly and leaves
|
||||
the live pem alone". GNU mv does no such thing: across filesystems it
|
||||
copies, so it truncates and writes the DESTINATION first and only then
|
||||
discovers it cannot finish (ENOSPC being the realistic case) - the very
|
||||
truncation this library exists to prevent. Both directories are
|
||||
env-overridable, so the device numbers have to be checked up front.
|
||||
"""
|
||||
staging = os.path.join(self.a_dir_on_another_filesystem(),
|
||||
'cert-staging')
|
||||
self.seed_previous_bundle()
|
||||
before = read(self.live_pem)
|
||||
|
||||
result = self.call('cert_publish "$1" "$2" "$3"',
|
||||
self.src_cert, self.src_key, self.live_pem,
|
||||
CERT_STAGING_DIR=staging)
|
||||
|
||||
self.assert_rejected(result, 'different filesystems')
|
||||
self.assertEqual(read(self.live_pem), before,
|
||||
'the live pem was disturbed by a refused publish')
|
||||
self.assert_certs_dir_is_clean()
|
||||
|
||||
def test_stale_python_side_staging_temps_are_reaped(self):
|
||||
"""The staging dir has two writers.
|
||||
|
||||
write_config_atomically() on the Python side stages as
|
||||
`<name>.<random>.tmp` (tempfile.mkstemp(prefix=name + '.',
|
||||
suffix='.tmp')). The reaper matched only mktemp's `*.??????` shape, so
|
||||
every temp leaked by a SIGKILL on the Python side stayed there forever.
|
||||
"""
|
||||
os.makedirs(self.staging_dir, exist_ok=True)
|
||||
stale_py = write(os.path.join(self.staging_dir,
|
||||
DOMAIN + '.pem.ab12cd34.tmp'), 'stale\n')
|
||||
stale_sh = write(os.path.join(self.staging_dir,
|
||||
DOMAIN + '.pem.AbCdEf'), 'stale\n')
|
||||
fresh = write(os.path.join(self.staging_dir,
|
||||
'recent.pem.zz99yy.tmp'), 'fresh\n')
|
||||
old = time.time() - 3 * 24 * 3600
|
||||
for path in (stale_py, stale_sh):
|
||||
os.utime(path, (old, old))
|
||||
|
||||
result = self.call('cert_publish "$1" "$2" "$3"',
|
||||
self.src_cert, self.src_key, self.live_pem)
|
||||
self.assertEqual(result.returncode, 0, result.stdout + result.stderr)
|
||||
|
||||
self.assertFalse(os.path.exists(stale_py),
|
||||
'a stale Python-side staging temp was never reaped')
|
||||
self.assertFalse(os.path.exists(stale_sh),
|
||||
'a stale shell-side staging temp was never reaped')
|
||||
self.assertTrue(os.path.exists(fresh),
|
||||
'the reaper deleted a temp a concurrent publisher may '
|
||||
'still be writing')
|
||||
|
||||
def test_validation_of_a_live_pem_being_republished_is_not_spurious(self):
|
||||
"""cert_bundle_valid must judge ONE snapshot of the file.
|
||||
|
||||
cert_publish() calls cert_bundle_valid() on the LIVE pem (step (e), to
|
||||
decide whether it is worth backing up) while another publisher may be
|
||||
renaming a new bundle over it. The function used to open the file six
|
||||
times, so `openssl x509` could read the outgoing bundle and `openssl
|
||||
pkey` the incoming one - and report "private key does not match the
|
||||
certificate" about two files that were each perfectly fine. That ERROR
|
||||
goes into the log monitor-errors.sh watches, which makes it a page.
|
||||
|
||||
The two bundles alternated below are each internally valid but carry
|
||||
DIFFERENT key material. That matters: NEW_BUNDLE and PREVIOUS_BUNDLE
|
||||
share a cert and a key, so alternating those two could never produce a
|
||||
mismatch no matter how badly the reads were interleaved - the test
|
||||
would model a world in which the bug cannot happen and pass forever.
|
||||
"""
|
||||
write(self.live_pem, NEW_BUNDLE)
|
||||
a = write(os.path.join(self.tmp, 'churn-a.pem'), NEW_BUNDLE)
|
||||
b = write(os.path.join(self.tmp, 'churn-b.pem'), OTHER_BUNDLE)
|
||||
|
||||
# A publisher renaming over the live pem as fast as it can. Staged
|
||||
# outside the certs dir, then renamed, exactly like cert_publish().
|
||||
churn = subprocess.Popen(
|
||||
['bash', '-c',
|
||||
'end=$((SECONDS+8)); s="$4"; while [ $SECONDS -lt $end ]; do '
|
||||
' cp "$1" "$s"; mv -f "$s" "$2"; '
|
||||
' cp "$3" "$s"; mv -f "$s" "$2"; '
|
||||
'done', '_', a, self.live_pem, b,
|
||||
os.path.join(self.tmp, 'churn-staged.pem')],
|
||||
env=self.env(), stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
|
||||
def _stop():
|
||||
churn.kill()
|
||||
churn.wait()
|
||||
self.addCleanup(_stop)
|
||||
|
||||
result = subprocess.run(
|
||||
['bash', '-c',
|
||||
'. "$1"; for i in $(seq 1 200); do cert_bundle_valid "$2" || exit 1; done',
|
||||
'_', LIB, self.live_pem],
|
||||
env=self.env(), capture_output=True, text=True, timeout=120)
|
||||
_stop()
|
||||
|
||||
output = result.stdout + result.stderr
|
||||
self.assertNotIn('does not match the certificate', output,
|
||||
'two valid bundles were reported as a mismatched pair '
|
||||
'because the checks read different files')
|
||||
self.assertEqual(0, result.returncode,
|
||||
f'a concurrent republish made validation fail: {output}')
|
||||
|
||||
def a_dir_on_another_filesystem(self):
|
||||
certs_dev = os.stat(self.certs_dir).st_dev
|
||||
for candidate in ('/dev/shm', '/run', '/var/tmp', '/tmp', '/'):
|
||||
try:
|
||||
if (os.path.isdir(candidate)
|
||||
and os.access(candidate, os.W_OK)
|
||||
and os.stat(candidate).st_dev != certs_dev):
|
||||
path = tempfile.mkdtemp(prefix='cert-xdev-', dir=candidate)
|
||||
self.addCleanup(shutil.rmtree, path, True)
|
||||
return path
|
||||
except OSError:
|
||||
continue
|
||||
self.skipTest('no writable directory on a second filesystem available')
|
||||
|
||||
def test_haproxy_config_ok_follows_the_validator(self):
|
||||
self.assertEqual(self.call('haproxy_config_ok').returncode, 0)
|
||||
write(self.haproxy_cfg, GOOD_HAPROXY_CFG + BROKEN_TOKEN + '\n')
|
||||
self.assertNotEqual(self.call('haproxy_config_ok').returncode, 0)
|
||||
|
||||
def test_missing_openssl_warns_but_does_not_block(self):
|
||||
"""Best-effort layer: a missing checker must not stall renewals."""
|
||||
fake_path = os.path.join(self.tmp, 'no-openssl-bin')
|
||||
def _openssl_free_path(self, name):
|
||||
"""A PATH directory with the library's tools but no openssl.
|
||||
|
||||
Symlinks, so this directory must never be walked with a chmod that
|
||||
follows them - see _cleanup_tmp().
|
||||
"""
|
||||
fake_path = os.path.join(self.tmp, name)
|
||||
os.makedirs(fake_path)
|
||||
for tool in ('cat', 'grep', 'mktemp', 'mv', 'cp', 'rm', 'mkdir',
|
||||
'basename', 'dirname', 'find', 'date', 'chmod'):
|
||||
'basename', 'dirname', 'find', 'date', 'chmod', 'stat'):
|
||||
real = shutil.which(tool)
|
||||
if real:
|
||||
os.symlink(real, os.path.join(fake_path, tool))
|
||||
return fake_path
|
||||
|
||||
def test_missing_openssl_is_a_hard_failure(self):
|
||||
"""The pairing check is MANDATORY: no openssl, no publication.
|
||||
|
||||
This used to assert the opposite - that a missing openssl warns and
|
||||
publishes anyway - justified by "the image does not necessarily install
|
||||
the openssl CLI". The image does: openssl 3.x arrives with
|
||||
ca-certificates, which certbot needs, and generate_self_signed_cert()
|
||||
already runs `openssl req` with check=True at first-run setup. So the
|
||||
fail-open never actually fired, and structural checks alone accept a
|
||||
bundle of empty pem blocks (see test_empty_pem_blocks_are_rejected).
|
||||
"""
|
||||
fake_path = self._openssl_free_path('no-openssl-bin')
|
||||
path = write(os.path.join(self.tmp, 'ok.pem'), NEW_BUNDLE)
|
||||
|
||||
# bash by absolute path: the stripped PATH cannot resolve it.
|
||||
@@ -583,29 +907,27 @@ class TestCertPublishLibrary(CertScriptFixture):
|
||||
'_', LIB, path],
|
||||
env=self.env(PATH=fake_path), capture_output=True, text=True)
|
||||
|
||||
self.assertEqual(result.returncode, 0,
|
||||
'a missing openssl blocked publication')
|
||||
self.assertRegex(result.stdout + result.stderr,
|
||||
r'(?i)warning.*openssl',
|
||||
'the skipped pairing check was not announced loudly')
|
||||
self.assert_rejected(result, 'openssl binary not found')
|
||||
self.assertIn('REFUSING', result.stdout + result.stderr,
|
||||
'a broken image must be reported as a broken image')
|
||||
|
||||
def test_missing_openssl_still_rejects_a_structurally_broken_bundle(self):
|
||||
fake_path = os.path.join(self.tmp, 'no-openssl-bin2')
|
||||
os.makedirs(fake_path)
|
||||
for tool in ('cat', 'grep', 'date'):
|
||||
real = shutil.which(tool)
|
||||
if real:
|
||||
os.symlink(real, os.path.join(fake_path, tool))
|
||||
path = write(os.path.join(self.tmp, 'nokey.pem'), TEST_CERT)
|
||||
def test_missing_openssl_stops_a_publish_rather_than_weakening_it(self):
|
||||
"""cert_publish must inherit the refusal, and not touch the live pem."""
|
||||
fake_path = self._openssl_free_path('no-openssl-bin2')
|
||||
self.seed_previous_bundle()
|
||||
before = read(self.live_pem)
|
||||
|
||||
# bash by absolute path: the stripped PATH cannot resolve it.
|
||||
result = subprocess.run(
|
||||
[shutil.which('bash'), '-c', '. "$1"; cert_bundle_valid "$2"',
|
||||
'_', LIB, path],
|
||||
[shutil.which('bash'), '-c',
|
||||
'. "$1"; cert_publish "$2" "$3" "$4"',
|
||||
'_', LIB, self.src_cert, self.src_key, self.live_pem],
|
||||
env=self.env(PATH=fake_path), capture_output=True, text=True)
|
||||
|
||||
self.assertNotEqual(result.returncode, 0,
|
||||
'structural checks stopped being mandatory')
|
||||
self.assert_rejected(result, 'openssl binary not found')
|
||||
self.assertEqual(read(self.live_pem), before,
|
||||
'the live pem was disturbed by a refused publish')
|
||||
self.assert_certs_dir_is_clean()
|
||||
self.assert_no_staging_leftovers()
|
||||
|
||||
|
||||
class TestScriptsAreSane(unittest.TestCase):
|
||||
|
||||
@@ -50,6 +50,7 @@ import logging
|
||||
import os
|
||||
import shutil
|
||||
import sqlite3
|
||||
import stat
|
||||
import subprocess
|
||||
import sys
|
||||
import tempfile
|
||||
@@ -90,8 +91,25 @@ finally:
|
||||
logging.getLogger('haproxy_manager').setLevel(logging.CRITICAL)
|
||||
|
||||
HAS_PUBLISHER = hasattr(hm, 'publish_pem_bundle')
|
||||
FIX_ONLY = unittest.skipUnless(
|
||||
HAS_PUBLISHER, 'requires the certificate publishing fix (publish_pem_bundle)')
|
||||
|
||||
# FIX_ONLY marks tests that can only run against a tree that HAS the fix, so
|
||||
# that pointing HAPROXY_MANAGER_DIR at a pre-fix checkout (how the bugs were
|
||||
# reproduced) skips them instead of erroring.
|
||||
#
|
||||
# It used to be `skipUnless(HAS_PUBLISHER, ...)` unconditionally, which is
|
||||
# tautological when testing THIS tree: rename or delete publish_pem_bundle and
|
||||
# 10 of the 17 tests silently skip themselves while the run still reports OK.
|
||||
# A guard that disappears when the thing it guards disappears is not a guard.
|
||||
# So the escape hatch is now tied to the thing it exists for - testing a
|
||||
# FOREIGN tree - and a missing publisher in the repo checkout is a hard
|
||||
# failure (see TestPublisherApiIsPresent).
|
||||
_REPO_ROOT = os.path.realpath(
|
||||
os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))
|
||||
TESTING_FOREIGN_TREE = os.path.realpath(MODULE_DIR) != _REPO_ROOT
|
||||
FIX_ONLY = unittest.skipIf(
|
||||
TESTING_FOREIGN_TREE and not HAS_PUBLISHER,
|
||||
'HAPROXY_MANAGER_DIR points at a tree without the certificate publishing '
|
||||
'fix (publish_pem_bundle)')
|
||||
NEEDS_OPENSSL = unittest.skipUnless(
|
||||
shutil.which('openssl'), 'needs the openssl CLI')
|
||||
|
||||
@@ -186,6 +204,14 @@ k49ABlblWHBsoUF63ka1PBrMgA==
|
||||
|
||||
GOOD_BUNDLE = LEAF_CERT + LEAF_KEY
|
||||
|
||||
# What a bundle already on disk looks like when a test starts: the same, valid
|
||||
# material plus a trailing marker. Without it the "previous" and "new" bundles
|
||||
# are byte-identical, and a test that meant to prove a publish HAPPENED cannot
|
||||
# tell that from a publish that did nothing at all. Trailing text after the key
|
||||
# is ignored by both HAProxy and openssl, so the file stays genuinely usable.
|
||||
PREVIOUS_MARKER = '# previous bundle\n'
|
||||
PREVIOUS_BUNDLE = GOOD_BUNDLE + PREVIOUS_MARKER
|
||||
|
||||
# Stub haproxy. Beyond the config check the parent suite's stub does, this one
|
||||
# also walks the crt directory the way HAProxy does when a `bind ... ssl crt
|
||||
# <dir>` is used: every file in there must be a loadable cert+key bundle, and
|
||||
@@ -375,9 +401,9 @@ class CertPublishTestCase(unittest.TestCase):
|
||||
self.write(os.path.join(live, 'privkey.pem'), key)
|
||||
return live
|
||||
|
||||
def publish_live_bundle(self, domain):
|
||||
def publish_live_bundle(self, domain, content=PREVIOUS_BUNDLE):
|
||||
"""A good bundle already being served for `domain`."""
|
||||
return self.write(os.path.join(self.certs, f'{domain}.pem'), GOOD_BUNDLE)
|
||||
return self.write(os.path.join(self.certs, f'{domain}.pem'), content)
|
||||
|
||||
def add_domain(self, domain, backend_name, ssl_cert_path=None):
|
||||
with sqlite3.connect(hm.DB_FILE) as conn:
|
||||
@@ -478,19 +504,38 @@ class TestLivePemIsNeverTruncated(CertPublishTestCase):
|
||||
self.assertEqual('error', resp.get_json()['status'])
|
||||
|
||||
def test_successful_renewal_still_publishes(self):
|
||||
"""The guard must not block the normal path."""
|
||||
"""The guard must not block the normal path.
|
||||
|
||||
The old version built its "renewed" certificate with a no-op
|
||||
`.replace('\\n-----END CERTIFICATE-----', '\\n-----END CERTIFICATE-----')`,
|
||||
so the renewed lineage was byte-identical to what was already being
|
||||
served. Every assertion still passed if the renewal published nothing
|
||||
at all - which is the failure this test is supposed to catch. The live
|
||||
bundle now carries a marker the renewed material does not, so "the file
|
||||
on disk changed" is an actual assertion.
|
||||
"""
|
||||
cert_path = self.publish_live_bundle('ok.example.com')
|
||||
self.assertIn(PREVIOUS_MARKER, self.read(cert_path),
|
||||
'fixture precondition: the live bundle is distinguishable')
|
||||
self.add_domain('ok.example.com', 'ok_backend', ssl_cert_path=cert_path)
|
||||
renewed = LEAF_CERT.replace('\n-----END CERTIFICATE-----',
|
||||
'\n-----END CERTIFICATE-----')
|
||||
self.make_lineage('ok.example.com', cert=renewed)
|
||||
self.make_lineage('ok.example.com')
|
||||
|
||||
resp = self.client.post('/api/certificates/renew')
|
||||
|
||||
self.assertEqual(200, resp.status_code, resp.get_data(as_text=True))
|
||||
self.assertTrue(structurally_valid(self.read(cert_path)))
|
||||
published = self.read(cert_path)
|
||||
self.assertEqual(GOOD_BUNDLE, published,
|
||||
'the renewed cert+key was not written to the live pem')
|
||||
self.assertNotIn(PREVIOUS_MARKER, published,
|
||||
'the previous bundle is still on disk: the renewal '
|
||||
'published nothing')
|
||||
self.assertTrue(structurally_valid(published))
|
||||
self.assertTrue(self.edge_would_start())
|
||||
self.assert_only_final_pems_in_certs_dir()
|
||||
backup = os.path.join(hm.cert_backup_dir(), 'ok.example.com.pem')
|
||||
self.assertTrue(os.path.exists(backup))
|
||||
self.assertEqual(PREVIOUS_BUNDLE, self.read(backup),
|
||||
'the archived copy is not the bundle that was replaced')
|
||||
|
||||
|
||||
class TestOldCertificateIsNotDestroyedFirst(CertPublishTestCase):
|
||||
@@ -658,11 +703,25 @@ class TestBundleValidation(CertPublishTestCase):
|
||||
|
||||
@FIX_ONLY
|
||||
def test_staging_and_backups_live_outside_the_crt_directory(self):
|
||||
"""A temp or backup file inside the crt dir would be loaded by HAProxy."""
|
||||
for path in (hm.cert_staging_dir(), hm.cert_backup_dir()):
|
||||
"""A temp or backup file inside the crt dir would be loaded by HAProxy.
|
||||
|
||||
`startswith(certs + os.sep)` alone let the worst case through: if
|
||||
cert_staging_dir() returned the crt directory ITSELF - staging straight
|
||||
into the directory HAProxy scans, the exact hazard this design exists
|
||||
to prevent - the assertion passed, because the certs dir is not a
|
||||
strict subpath of itself.
|
||||
"""
|
||||
certs = os.path.realpath(self.certs)
|
||||
for name, path in (('staging', hm.cert_staging_dir()),
|
||||
('backup', hm.cert_backup_dir())):
|
||||
real = os.path.realpath(path)
|
||||
self.assertNotEqual(
|
||||
certs, real,
|
||||
f'the {name} directory IS the crt directory - HAProxy would '
|
||||
f'load every temp/backup file in it')
|
||||
self.assertFalse(
|
||||
os.path.abspath(path).startswith(os.path.abspath(self.certs) + os.sep),
|
||||
f'{path} must not be inside {self.certs}')
|
||||
real.startswith(certs + os.sep),
|
||||
f'the {name} directory {path} must not be inside {self.certs}')
|
||||
|
||||
@FIX_ONLY
|
||||
def test_previous_bundle_is_backed_up_on_publish(self):
|
||||
@@ -700,18 +759,160 @@ class TestBundleValidation(CertPublishTestCase):
|
||||
'file')
|
||||
|
||||
@FIX_ONLY
|
||||
@NEEDS_OPENSSL
|
||||
def test_no_temp_file_survives_a_failed_publish(self):
|
||||
"""The failure must happen AFTER something has been staged.
|
||||
|
||||
This used to feed publish_pem_bundle() an empty privkey, which is
|
||||
rejected while reading the sources - before the staging directory is
|
||||
even created. The test then asserted `[] == []` and proved nothing
|
||||
about temp-file cleanup. A structurally perfect bundle whose key
|
||||
belongs to a different certificate is rejected by the pairing check,
|
||||
which runs on the fully staged file, so the temp definitely exists at
|
||||
the moment the publish fails.
|
||||
"""
|
||||
dest = os.path.join(self.certs, 'leak.example.com.pem')
|
||||
cert = self.write(os.path.join(self.tmp, 'src4', 'fullchain.pem'),
|
||||
LEAF_CERT)
|
||||
empty = self.write(os.path.join(self.tmp, 'src4', 'privkey.pem'), '')
|
||||
wrong = self.write(os.path.join(self.tmp, 'src4', 'privkey.pem'),
|
||||
UNRELATED_KEY)
|
||||
with self.assertRaises(hm.CertificatePublishError):
|
||||
hm.publish_pem_bundle(dest, [cert, empty])
|
||||
hm.publish_pem_bundle(dest, [cert, wrong])
|
||||
|
||||
staging = hm.cert_staging_dir()
|
||||
self.assertTrue(os.path.isdir(staging),
|
||||
'the publish never got as far as staging, so this '
|
||||
'asserts nothing about cleanup')
|
||||
self.assertEqual([], os.listdir(staging),
|
||||
'staged files must be cleaned up when a publish fails')
|
||||
self.assertFalse(os.path.exists(dest),
|
||||
'a rejected bundle was published anyway')
|
||||
self.assert_only_final_pems_in_certs_dir()
|
||||
self.assertEqual(
|
||||
[], os.listdir(hm.cert_staging_dir()) if
|
||||
os.path.isdir(hm.cert_staging_dir()) else [],
|
||||
'staged files must be cleaned up when a publish fails')
|
||||
|
||||
|
||||
@FIX_ONLY
|
||||
@NEEDS_OPENSSL
|
||||
def test_empty_pem_blocks_are_rejected(self):
|
||||
"""Why the pairing check may not be best-effort.
|
||||
|
||||
Structural validation is weak on its own: BEGIN/END pairs with nothing
|
||||
between them satisfy every rule in validate_pem_structure(). Only
|
||||
openssl can say this is not a certificate.
|
||||
"""
|
||||
hollow = ('-----BEGIN CERTIFICATE-----\n-----END CERTIFICATE-----\n'
|
||||
'-----BEGIN PRIVATE KEY-----\n-----END PRIVATE KEY-----\n')
|
||||
ok, _ = hm.validate_pem_structure(hollow)
|
||||
self.assertTrue(ok, 'precondition: structure alone accepts this file')
|
||||
|
||||
path = self.write(os.path.join(self.tmp, 'hollow.pem'), hollow)
|
||||
ok, msg = hm.validate_pem_bundle(path)
|
||||
self.assertFalse(ok, 'a bundle of empty pem blocks was accepted')
|
||||
|
||||
@FIX_ONLY
|
||||
def test_publish_refuses_when_the_pairing_check_cannot_run(self):
|
||||
"""No fail-open. 'unavailable' means the image is broken, not the cert.
|
||||
|
||||
The previous behaviour logged a warning and published on structural
|
||||
checks alone, justified by "the Dockerfile does not install the openssl
|
||||
CLI". It does - openssl 3.x comes in with ca-certificates, and
|
||||
generate_self_signed_cert() shells out to `openssl req` with
|
||||
check=True during setup - so this branch never fired and the fail-open
|
||||
was safe only by accident.
|
||||
"""
|
||||
real = hm._openssl_pairing_status
|
||||
hm._openssl_pairing_status = lambda path: ('unavailable',
|
||||
'openssl binary not found')
|
||||
self.addCleanup(setattr, hm, '_openssl_pairing_status', real)
|
||||
|
||||
dest = self.publish_live_bundle('nocheck.example.com')
|
||||
before = self.read(dest)
|
||||
cert = self.write(os.path.join(self.tmp, 'src5', 'fullchain.pem'),
|
||||
LEAF_CERT)
|
||||
key = self.write(os.path.join(self.tmp, 'src5', 'privkey.pem'), LEAF_KEY)
|
||||
|
||||
with self.assertRaises(hm.CertificatePublishError):
|
||||
hm.publish_pem_bundle(dest, [cert, key])
|
||||
|
||||
self.assertEqual(before, self.read(dest),
|
||||
'the live pem was disturbed by a refused publish')
|
||||
self.assert_only_final_pems_in_certs_dir()
|
||||
|
||||
@FIX_ONLY
|
||||
def test_binary_corrupt_live_bundle_can_still_be_republished(self):
|
||||
"""Republishing is how an operator heals a corrupt live pem.
|
||||
|
||||
A pem corrupted into binary (a partial write from before this fix, a
|
||||
bad restore) is unreadable as text. backup_existing_pem() opens it in
|
||||
text mode and caught only OSError, so the UnicodeDecodeError escaped
|
||||
publish_pem_bundle() entirely: the single operation that would have put
|
||||
a working certificate back blew up trying to archive the broken one.
|
||||
The shell half recovers from this without complaint.
|
||||
"""
|
||||
dest = os.path.join(self.certs, 'binary.example.com.pem')
|
||||
with open(dest, 'wb') as fh:
|
||||
fh.write(b'\x00\x01\x02\xfe\xff' * 128)
|
||||
cert = self.write(os.path.join(self.tmp, 'src6', 'fullchain.pem'),
|
||||
LEAF_CERT)
|
||||
key = self.write(os.path.join(self.tmp, 'src6', 'privkey.pem'), LEAF_KEY)
|
||||
|
||||
hm.publish_pem_bundle(dest, [cert, key])
|
||||
|
||||
self.assertEqual(GOOD_BUNDLE, self.read(dest),
|
||||
'a binary-corrupt live pem blocked its own repair')
|
||||
self.assertTrue(self.edge_would_start())
|
||||
|
||||
@FIX_ONLY
|
||||
def test_published_pem_file_mode(self):
|
||||
"""Publishing must not silently re-permission a private key.
|
||||
|
||||
The staged file is created by mkstemp at 0600; without the explicit
|
||||
mode copy in write_config_atomically() every publish would tighten a
|
||||
0644 bundle, and a future change in the other direction would loosen
|
||||
one. Neither is a decision a write-safety fix gets to make as a side
|
||||
effect, so pin it.
|
||||
"""
|
||||
cert = self.write(os.path.join(self.tmp, 'src7', 'fullchain.pem'),
|
||||
LEAF_CERT)
|
||||
key = self.write(os.path.join(self.tmp, 'src7', 'privkey.pem'), LEAF_KEY)
|
||||
|
||||
for mode in (0o644, 0o640, 0o600):
|
||||
with self.subTest(oct(mode)):
|
||||
dest = self.publish_live_bundle(f'mode{mode:o}.example.com')
|
||||
os.chmod(dest, mode)
|
||||
hm.publish_pem_bundle(dest, [cert, key])
|
||||
self.assertEqual(mode,
|
||||
stat.S_IMODE(os.stat(dest).st_mode),
|
||||
'publishing changed who can read the key')
|
||||
|
||||
fresh = os.path.join(self.certs, 'fresh.example.com.pem')
|
||||
hm.publish_pem_bundle(fresh, [cert, key])
|
||||
fresh_mode = stat.S_IMODE(os.stat(fresh).st_mode)
|
||||
self.assertEqual(0o644, fresh_mode,
|
||||
'a newly created bundle should match the 0644 that '
|
||||
'`cat > file` produced under the standard umask')
|
||||
self.assertEqual(0, fresh_mode & 0o022,
|
||||
'a private key must never be group/world writable')
|
||||
|
||||
|
||||
@unittest.skipIf(TESTING_FOREIGN_TREE,
|
||||
'HAPROXY_MANAGER_DIR points at another tree')
|
||||
class TestPublisherApiIsPresent(unittest.TestCase):
|
||||
"""FIX_ONLY must never be able to hide the fix going missing.
|
||||
|
||||
With `FIX_ONLY = skipUnless(hasattr(hm, 'publish_pem_bundle'))`, renaming
|
||||
that one function turned 10 of these 17 tests into skips and the run still
|
||||
printed OK. This class fails loudly instead.
|
||||
"""
|
||||
|
||||
def test_publisher_api_is_present(self):
|
||||
for name in ('publish_pem_bundle', 'validate_pem_bundle',
|
||||
'validate_pem_structure', 'backup_existing_pem',
|
||||
'cert_staging_dir', 'cert_backup_dir',
|
||||
'CertificatePublishError', '_openssl_pairing_status'):
|
||||
self.assertTrue(
|
||||
hasattr(hm, name),
|
||||
f'haproxy_manager.{name} is gone - the tests that exercise it '
|
||||
f'would otherwise skip themselves and report OK')
|
||||
|
||||
|
||||
class TestClusterSecretSelfHeal(CertPublishTestCase):
|
||||
|
||||
Reference in New Issue
Block a user