* fix(webhooks): redact IPv6 addresses in sanitized error messages
sanitize_error() only stripped IPv4 literals, so a failed webhook
delivery to an internal IPv6 host (::1, fe80::/fc00:: ...) leaked the
address into Webhook.last_error, which is surfaced in the UI. The module
already treats internal IPv6 as sensitive (see _PRIVATE_NETWORKS and
src/url_safety.py); the scrubber just didn't keep up.
Add an IPv6 redaction pass covering bracketed, full 8-group, and
::-compressed forms. The pattern is scoped to leave clock times
("12:34:56"), MAC addresses, and C++ "::" tokens untouched, and the
::-branch uses a lookahead over a flat character class so there is no
nested quantifier to backtrack on (no ReDoS on long colon/hex runs).
Adds tests/test_webhook_sanitize_error_ipv6.py.
* webhook: validate IPv6 candidates with ipaddress, not a regex grammar
Per review on #3038: instead of hand-rolling the IPv6 grammar in a regex
(brittle, and easy to over-match colon-heavy text), use a loose regex to
find candidate tokens and let ipaddress.ip_address() decide. Only tokens
it parses as IPv6 are redacted, so the false-positive guards (clock times,
MACs, "std::vector") now come from the stdlib instead of a custom pattern.
This also covers cases the old pattern missed -- zone ids (fe80::1%eth0)
and IPv4-mapped addresses -- and no longer partially mangles invalid
colon strings (a 9-group token is preserved whole rather than losing its
first 8 groups). The bracketed branch is a single greedy class with no
X*:X* backtracking; verified ~1ms on 40k-char adversarial input.
Extends the test file with zone-id, IPv4-mapped, and invalid-token cases.
* webhook: redact bracketed/scoped/IPv4-mapped IPv6 as one unit
Review on #3038 found a few IP forms left partially redacted or malformed
by sanitize_error():
[fe80::1%eth0]:8080 -> [[redacted]]:8080
[::ffff:192.168.0.1]:8080 -> [[redacted][redacted]]:8080
::ffff:192.168.0.1 -> [redacted][redacted]
Two causes: the bracketed branch's character class dropped zone ids, so
scoped addresses fell through to the bare branch and left the brackets and
port behind; and the IPv4 pass ran first, stripping the embedded v4 of an
IPv4-mapped address so the v6 pass then redacted the "::ffff:" remnant
separately.
Fix:
- run the IP-candidate pass before the IPv4 pass, so IPv4-mapped forms are
matched and redacted whole
- match the full bracketed authority ([...] + optional %zone + :port) as a
single token, and redact a v4-or-v6 literal inside [ ] as one [redacted]
- extend the bare branch with a bounded (exactly-3) dotted-quad tail for
IPv4-mapped forms; exactly-3 so it can't swallow a partial suffix and
accidentally preserve an otherwise-valid address
Each form now collapses to a single [redacted]; the candidate finder stays
linear (~1.3ms on 40k-char adversarial input). Adds regression tests for
the three reported forms and keeps the timestamp/MAC/std::vector coverage.
Karandeep Bhardwaj