set_asn_exempt() was writing /etc/crowdsec/scenarios/local-asterisk_*.yaml
directly from the dashboard's own process, but those files are root:root
mode 644 and the secdash service user (--shell /usr/sbin/nologin) has no
write grant to them - confirmed by the reported "[Errno 13] Permission
denied" error. Every whitelist/unban attempt through the dashboard was
silently a no-op as far as CrowdSec was concerned, which is why a
carrier's IP kept getting re-banned even after repeatedly trying to
exempt its ASN.
Fixed by routing the edit through a dedicated root-owned helper script
(set-asn-exempt.sh, installed alongside app.py, root:root mode 700) that's
the one thing added to the sudoers whitelist - same pattern every other
CrowdSec-touching action here already uses (cscli via sudo), rather than
loosening the scenario files' own permissions.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ho9mZgAkVpdz7S5wJkg8Nf
- Replace the hourly cron.d spend/volume check with a per-minute systemd
timer (cron.d fallback), since it's now also the kill-switch's
enforcement point and the interval is the exposure window.
- Add a hard monthly spend-cap kill-switch: trips pstn-trunk-killswitch.conf
(read live by the dialplan, both call directions, internal calling
unaffected) once estimated spend reaches an admin-set cap, plus a loud
ntfy warning at 80% of the cap before it trips. Does not auto-reset;
clearing it is a CLI-only action (update mode) so a compromised/careless
web session can't quietly re-enable spend after a trip.
- Add a CLI-only (never web-dashboard) international-calling allow-list:
continent/country menu, always asked every run with the resulting
allow-list printed exactly once right after, optional auto-expiry with
day-of and at-expiry ntfy notices, and active re-blocking once expired.
Dialplan gates the US "011" prefix pattern on it for full-tier extensions.
- Add an independent messaging_enabled flag per extension in
pstn-permissions.conf for Asterisk's native SIP MESSAGE texting, since
the risk profile (no cost) differs from PSTN calling permissions. The
dialplan wiring to enforce it is flagged as a known gap pending live
verification against Easy Asterisk's message routing, rather than
shipping a guessed pattern.
- security-dashboard.sh: detect whether pstn-trunk is actually installed
(not just base Asterisk) and show a clear "not installed" state instead
of misleading default caps/extensions; add clickable column-header
sorting to the CrowdSec active-bans table.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ho9mZgAkVpdz7S5wJkg8Nf
Adds an inbound concurrent-call cap mirroring the existing outbound one -
outbound alone didn't protect against an inbound call-flood, which also
costs money per-minute on VoIP.ms. Both defaults bumped from 3 to 10.
Moves the cap numbers themselves out of static dialplan text and into a new
pstn-limits.conf, read live via AST_CONFIG() the same way permission tiers
already are - changing either cap takes effect on the next call, no
Asterisk restart, no reinstall. "update in place" never touches this file,
matching the existing protection for pstn-permissions.conf/.env/firewall/
Caddy config.
Adds a concurrency-caps card to security-dashboard.sh's "PSTN Trunk" tab,
above the existing permissions table, so both caps are visible and editable
from the same web page. Tested against a real running instance of the
Python app: default fallback when the file doesn't exist yet, save/persist,
invalid-input rejection, and a bash-to-Python round trip on the generated
file format.
Inbound dialplan ordering mirrors outbound's existing pattern: permission
check (is any ring-group member authorized for this caller) before the
concurrency check, consistent with outbound's tier-check-then-busy-check
order.
Reworks the outbound permission model from a flat allow-list into three
per-extension tiers (internal / restricted / full), addressing the ask for
extensions that can only reach pre-approved numbers plus extensions with
full US calling, while internal extension-to-extension dialing and ring
groups stay ungated for everyone regardless of tier.
Permissions now live in pstn-permissions.conf, read by the dialplan via
Asterisk's AST_CONFIG() on every call instead of being baked into static
dialplan text - editing that file takes effect on the next call, no
Asterisk restart and no re-running the installer. "update in place" mode
never touches this file (same protection this repo's update-mode
convention already gives .env/firewall/Caddy config); only a "fresh"
reinstall (with confirmation) or the web UI change it.
Adds a "PSTN Trunk" tab to services/security-dashboard.sh: lists every
extension (parsed from pjsip.conf) with its live tier and approved numbers,
editable with no restart - this is what makes the tier model actually
manageable day to day. Extracted the dashboard's systemd-unit writing into
its own function so "update" mode refreshes it too (previously only fresh
installs did), and generalized both the dashboard and the trunk service to
detect either asterisk-digital-ocean or the home/LAN asterisk install.
Inbound ring-group membership now checks each member's tier live per call
via an unrolled per-member dialplan block (full always rings, restricted
only if the caller's number is approved, internal never rings) rather than
a single static Dial() string.
Caught and fixed two real bugs during testing against a sandboxed vendor
copy and a live instance of the (stdlib-only) Python dashboard app:
- Asterisk Goto/GotoIf argument parsing: ring<ext>/skip<ext> are named
priorities within the same extension (declared via "same => n(label),..."),
not separate exten => entries, so jumping to them needs the single-argument
Goto(label) form - the two-argument Goto(label,1) form used initially
addresses a different, nonexistent extension named "label" instead.
- A security-relevant REGEX() direction issue: the inbound Caller-ID check
initially interpolated attacker-influenced call data into the PATTERN side
of a REGEX() match rather than the tested-string side, which would let a
crafted Caller-ID forge a match against an unrelated approved-numbers
entry. Fixed by keeping the admin-controlled approved-list as the pattern
and the live call data as the string being tested, consistently on both
the outbound and inbound checks.
Verified end-to-end: dialplan/pjsip generation and vendor-file patching
(idempotent, syntax-checked) as before, plus the new permission-file
round-trip between bash and Python, and the dashboard's new API endpoints
exercised against a real running Python server (extension parsing, tier
changes, number normalization, invalid-input rejection, atomic file writes).
- CrowdSec tab: per-ASN "Unwhitelist" (drop from the exempt filter, future
traffic evaluated normally) and "Unwhitelist + Ban" (also immediately
bans every IP CrowdSec has on record for that ASN, for accidental-
whitelist cases) buttons. set_asn_exempt now allows clearing the list
down to zero ASNs, needed to unwhitelist the last remaining entry.
- New sudoers permission (cscli decisions add --ip * --duration * --type
ban --reason *) scoped narrowly, list-form subprocess args only.
- Caddy/Authelia config factored into _secdash_configure_caddy() and a new
_secdash_remove_caddy_block() (whole-block delete-and-regenerate, not
in-place patching) so "update" mode can now offer to reconfigure it.
- Installer offers an independent HTTP Basic Auth layer in front of
Authelia (Caddy basicauth, generated via `caddy hash-password`) so a
future Authelia bug/misconfig alone isn't enough to expose a page that
can delete active security bans.
Currently-exempt ASNs with no active ban (e.g. T-Mobile once its bans
stop firing) had no carrier name to show, since the name lookup only
looked at cscli decisions list (active bans only). Add a
cscli alerts list-based fallback (includes expired/resolved alerts)
and merge it into the name lookup used by /api/asn-exempt.
Confirmed the real cscli decisions list -o json structure live rather
than guessing again: AS number/name and country live on each alert's
"source" object (source.as_number, source.as_name, source.cn), not on
the individual decision. Surfaces this as a "Network / Carrier" and
"Country" column in the bans table, adds a per-row "Exempt ASN" button
that appends straight to the Asterisk brute-force ASN exemption list,
and labels the exempt list's own entries with carrier names (pulled
from current ban data where available) instead of showing bare numbers.
Confirmed live: Caddy (in a container) reaches this via
host.docker.internal, a Docker bridge gateway IP, not localhost — a
loopback-only bind refuses that connection outright ("dial tcp
172.17.0.1:8092: connect: connection refused"), even though curl from
the host itself worked fine on 127.0.0.1. Bind to 0.0.0.0 and rely on
UFW for the actual access scoping instead, matching every other
host-network service in this repo (e.g. the Asterisk web admin, which
already binds this way successfully with the same
ufw_allow_from_caddy_net pattern).
Confirmed live: setup.sh's run_service() calls install_${name} with
no hyphen-to-underscore conversion, so a hyphenated service name needs
a literally-hyphenated function name (install_security-dashboard, not
install_security_dashboard) to be found at all — got this wrong on
first pass by following CLAUDE.md's own (incorrect) guidance, which
said to convert hyphens to underscores. Every other hyphenated service
in the repo (asterisk-digital-ocean, wolf-pair, mail-archiver,
drum-rhythm-game) already keeps hyphens literal; corrected CLAUDE.md
to match actual practice instead of the other way around.
New service, native on the host (not Docker) so it can call cscli and
read Asterisk's security log directly without bridging the
container/host boundary or exposing CrowdSec LAPI credentials to a
containerized frontend.
- Security Log tab: parses ~/docker/asterisk-digital-ocean/logs/full
for SIP auth failures (wrong password, unknown extension, etc.) with
timestamp/account/remote IP, classified by severity.
- CrowdSec tab: current bans via cscli, a delete/unban button per
entry, and ASN-exempt management for the Asterisk brute-force
scenarios (services/crowdsec.sh) without SSHing in.
- Link out to the existing Asterisk web admin (reads its domain from
asterisk-digital-ocean's own .env, doesn't hardcode or embed it).
Runs as a dedicated unprivileged system user (secdash), with sudo
scoped to exactly three commands via /etc/sudoers.d/security-dashboard
(cscli decisions delete --id <digits>, cscli decisions list -o json,
systemctl restart crowdsec) — validated with visudo -c. Listens on
127.0.0.1 only, reachable through Caddy, and refuses to proceed without
explicit confirmation if no Authelia (local or remote) is configured,
since this page can delete active security bans.
Stdlib-only Python (no framework), matching the RAM-conscious pattern
already used for Easy Asterisk's own web admin. All embedded code
(bash, Python, JS) syntax-checked; the generated sudoers rule
validated with visudo -c -f.
Claude