Mastodon has no RBL/DNSBL support — nothing in it consults an outside
list when deciding whether to accept a signup, confirmed against v4.7.1
(the only outbound lookup in that path is EmailMxValidator's MX
resolution, which feeds the local email_domain_blocks table). So a
shared blocklist has to be imported rather than queried live, the same
way Garden Fence and other community lists propagate. These are the
pieces that make ours importable.
- ?format=txt on both per-list endpoints: one entry per line under a '#'
comment header, the form blocklists are traded in and the form a cron
job can consume without a JSON parser. The combined /api/blocks stays
JSON-only — a text rendering would mix CIDRs with domains in one file,
defeating the point. An unrecognised ?format is a 400 rather than a
silent fallback to JSON, and the enabled-gate still runs first so a
disabled deployment 404s either way.
- Access-Control-Allow-Origin: * on blocklist responses, so browser-side
admin tooling can read them. The data is already public.
- bin/yttrx-blocklist-import: standard-library-only importer another
admin can run against their own instance. Dry run unless --apply;
422 from Mastodon counts as "already blocked", not an error.
The importer defaults IP entries to sign_up_requires_approval rather
than the sign_up_block yttrx uses itself. The entries are whole ASN
routes, which suits yttrx because a flagged signup here is nearly always
datacenter/VPN/proxy space — that calibration isn't transferable, so an
importer gets the reviewable severity by default and has to opt into the
hard one.
Every row blocked before the block_cidr column existed had nothing to
report, so the endpoint fell back to the signup IP's /32 — the address
that signed up rather than the range that was blocked, which is the
opposite of what the list is for.
The range is recoverable from the bot's own ipapi range cache, which
stores the CIDR each classification was cached under — the same value
that was handed to register_ip_block. Run once on admin.yttrx.com:
of 154 blocked rows, 65 gained their real range, 79 genuinely were
single-address blocks (no asn.route from ipapi.is), and 10 with no cache
entry stay as a /32, since under-reporting beats claiming a range is
blocked when it isn't. Rows classified before 2026-07-15 are skipped —
range-blocking didn't exist yet, so only the /32 was ever registered.
Live output went from 150 entries (all /32) to 145, of which 59 are
real networks.
Watches every account flagged by IP-scrutiny or email-domain scrutiny at
signup and, once it goes live, records a baseline post/follow count. A
scheduled sweep (app/suspicious_sweep.py, run via cron on admin.yttrx.com)
suspends any watch past SUSPICIOUS_GRACE_HOURS with zero new posts and
zero new follows since that baseline; any activity clears the watch.
Works whether yttrx is open-registration or requires moderator approval,
since the watch starts at whichever event actually makes the account live
(account.created vs account.approved), same dual handling the welcome flow
already uses. Needs ABUSE_BOT_TOKEN re-minted with admin:read:accounts.
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