Add extension-custom-scripts for supautils ownership/grant handoffs - #32
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Gated extensions install as the supautils superuser switch, so their state-bearing objects land owned by that superuser instead of a customer-facing role. Adds a before-create.sql for lolor (refuses the install outright, every consumer of this image needs spock deployed first) and after-create.sql for pg_cron, pg_tokenizer, vchord_bm25, postgis_tiger_geocoder, and address_standardizer_data_us (grant or reassign ownership to a role named app, when one exists). Each after-create.sql is a no-op when no role named app exists, so CREATE EXTENSION still succeeds unchanged for a consumer of this image with a different role model. Verified end to end against a real build: every script installs cleanly with and without an app role present, lolor is refused for every role including postgres itself, and app gets exactly the intended access for each of the other five.
Grant/ownership scripts hardcoded a role named "app" and only ran when that role existed, an assumption specific to one deployment's role model. Every one of them now grants to pg_database_owner instead, a predefined role Postgres automatically keeps in sync with whoever currently owns the database an extension installs into. Verified this tracks an ALTER DATABASE ... OWNER TO change automatically, and that every script works identically for a database owned by an arbitrary role name, not just "app". No more per-script existence check needed: pg_database_owner always exists. lolor's before-create.sql now checks whether spock is actually installed in the same database instead of refusing the install unconditionally. Confirmed both directions: blocked without spock, allowed once spock is present. Swept the remaining "drydock"/app-specific language out of the comments and README.
The previous fix only granted INSERT on topology.topology and topology.layer, enough for CreateTopology()/AddTopoGeometryColumn() but not for dropping or renaming a topology: those also need DELETE, UPDATE, and in the rename path, ALTER TABLE ... DISABLE TRIGGER on topology.layer, which only an owner can do. Reassigns ownership of both tables to pg_database_owner instead, the same approach already used for pg_cron's job tables, so the full lifecycle works in one step.
supautils only loads in admin's session, so a script under extension_custom_scripts_path never runs for a session that connects directly as app or postgres. lolor is trusted=true, so both could install it directly with no admin session in the path at all, bypassing the block entirely and breaking large-object support database-wide with no self-service recovery. The block now lives as a database-level event trigger in drydock's Cluster CR instead, which is role-independent. Updates the README to document why this directory can't cover a check like that.
…check Explains, for future script authors, why a script under extension_custom_scripts_path only runs in a session that has supautils loaded (in practice, a privileged extension install), and why a check that must hold regardless of role or session, like lolor's, needs a database-level mechanism such as an event trigger instead.
lolor ships trusted=true, so app could install it directly with no admin session or supautils involved at all, meaning the conditional before-create.sql check for it never ran on that path. Patches the control file to trusted=false in the Dockerfile instead, so every install goes through the gate and always lands in a session supautils has already loaded. The before-create.sql itself is unchanged from before: refuse the install unless spock is already there.
supautils.privileged_extensions only checks an extension's name, not who is asking, so restricting installs to admin previously depended on supautils only ever being loaded into admin's session. A connection that authenticates directly as app never loads supautils at all, so any before-create.sql under extension_custom_scripts_path never runs for it either, and any extension shipping trusted=true (lolor did) installs straight through Postgres's own trusted-extension path with no gate in the way. Every extension on the allowlist, lolor included, now carries a before-create.sql that checks session_user against supautils.privileged_role directly. session_user stays the role that actually authenticated for the whole session, unaffected by supautils switching the acting role to perform a privileged install, so the check holds regardless of which sessions have supautils loaded. This replaces the earlier fix that patched lolor's control file to trusted=false, which only worked because of the same session-scoping assumption and required changing a setting in an image other projects also use.
Handing ownership of cron.job and cron.job_run_details to pg_database_owner (so admin can manage its own jobs) also exempted that owner from cron.job's own "username = CURRENT_USER" policy, since row level security does not apply to a table's owner by default. With that ownership in place, admin could insert or update a row naming any username, postgres included, bypassing the policy entirely, confirmed on a live cluster. Once cron.use_background_workers is on, pg_cron's launcher then tries to execute that row in-process and segfaults, crashing the instance into a restart loop the bad row causes again on every restart. FORCE ROW LEVEL SECURITY on both tables holds the owner to the same policy as everyone else. admin can still schedule, list, and unschedule its own jobs normally; the same bypass attempt now fails cleanly with the RLS error instead of reaching the launcher at all.
Every allowlisted extension carried a before-create.sql checking session_user against supautils.privileged_role directly, built on supautils loading cluster-wide. drydock now loads supautils only into admin's own session, so a role check here is redundant: a session that never loads supautils never reaches this hook either way, and one that does only exists because it authenticated as the privileged role. Removes the check from all eleven other gated extensions entirely and from lolor, which keeps only its own spock-dependency check: lolor requires spock in the same database regardless of who installs it, an unrelated functional constraint, not part of the role gate. Qualifies lolor's pg_extension lookup with pg_catalog so a role that can reach this script cannot shadow the catalog with a decoy relation earlier in its own search_path.
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Included review availability: 4 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. 📝 WalkthroughWalkthroughThe standard image now packages extension custom scripts, adds extension-specific access grants, expands standard-image integration tests, and updates PostgreSQL/Spock image epochs from 2 to 3. ChangesExtension custom scripts
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Inline comments:
In `@Dockerfile`:
- Line 141: Configure the standard PostgreSQL image to set
supautils.extension_custom_scripts_path to /etc/pgedge/extension-custom-scripts
in the PostgreSQL configuration it loads, alongside the existing
extension-custom-scripts COPY. Preserve the directory path exactly so the
before-create and after-create scripts are enabled by default.
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Dockerfileextension-custom-scripts/README.mdextension-custom-scripts/address_standardizer_data_us/after-create.sqlextension-custom-scripts/lolor/before-create.sqlextension-custom-scripts/pg_cron/after-create.sqlextension-custom-scripts/pg_tokenizer/after-create.sqlextension-custom-scripts/postgis_tiger_geocoder/after-create.sqlextension-custom-scripts/postgis_topology/after-create.sqlextension-custom-scripts/vchord_bm25/after-create.sql
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… schema address_standardizer_data_us is the one script in this directory where the schema its tables land in isn't fixed: it's relocatable, with no schema set in its control file, so CREATE EXTENSION address_standardizer_data_us SCHEMA gis puts us_lex/us_gaz/us_rules in gis, not public. The hardcoded public.us_lex reference failed on relations that don't exist in that case. Looks the schema up from pg_extension.extnamespace at runtime instead of relying on supautils' own @extschema@ substitution, which is only populated when the caller's CREATE EXTENSION included an explicit SCHEMA clause and is otherwise SQL NULL, the common case. Verified against both: the default (no SCHEMA clause) and an explicit one.
…list entry Confirmed directly rather than assumed: supautils runs a before-create.sql for any extension that has one, for any session with the hook active, independent of supautils.privileged_extensions. The allowlist only controls whether the install gets a superuser switch, and lolor never needed that switch since it ships trusted=true. This is the only thing standing between a role with plain CREATE privilege and lolor's destructive install, for a deployment that hasn't set up its own separate way to block it.
…upautils loads The existing supautils tests only confirmed the library preloads and registers its GUCs. Adds real exercise of the gate and this directory's scripts: a non-superuser role installing an allowlisted extension through the gate and refused a non-allowlisted one, address_standardizer_data_us's after-create.sql granting access both with and without an explicit SCHEMA clause, and lolor's before-create.sql refusing the install without spock present. Verified end to end against a local image built from this branch layered on the published base, both flavors, before and after fixing two bugs the first run caught: a case-sensitive string match against Postgres's own error text, and spock already being installed by an earlier, unrelated test in the same shared database, which made the without-spock case not actually spock-less until dropped first.
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Inline comments:
In `@extension-custom-scripts/address_standardizer_data_us/after-create.sql`:
- Around line 31-34: Update the grant block in the after-create SQL to grant
USAGE on the formatted extension schema to pg_database_owner before granting
table SELECT privileges. Keep the existing table grants unchanged, and extend
validation to confirm schema USAGE or successfully query a granted table as the
new database owner.
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… SELECT Table-level SELECT alone doesn't let a role query a table outside a schema it can't use: Postgres checks USAGE on the schema before it will even look a table up in it. The default, unrelocated case (public) worked anyway, since public grants USAGE to PUBLIC by default, masking that a schema named on an explicit SCHEMA clause has no such default and would leave pg_database_owner with a grant it could never actually use. The existing tests didn't catch this because they checked has_table_privilege, which only covers the table-level grant and returns true regardless of schema USAGE. Switched both to running the real query as the actual database owner (gate_test_role, made owner of testdb rather than merely granted CREATE on it, so pg_database_owner resolves to a genuine non-superuser instead of postgres, which would bypass every check regardless of what's granted). Confirmed the relocated-schema case now fails against the pre-fix script and passes against the fix.
…igured Copying the scripts into the image doesn't load supautils or point supautils.extension_custom_scripts_path at them; shared_preload_libraries is empty by default, and neither this nor any other supautils.* setting is baked into the image. States that plainly next to the COPY, so activation reads as a deliberate, consistent choice rather than something missing.
Reassigned ownership of cron.job and cron.job_run_details to pg_database_owner so the database's owner could schedule and manage its own jobs, then had to force row level security on both tables to close a gap that ownership itself created: the new owner could set username on a row to any role, including postgres, and pg_cron's launcher would then execute that row in-process and crash the instance rather than raising a clean permission error. Checked directly whether the ownership was ever needed at all. It wasn't: cron.schedule() and cron.unschedule() are not SECURITY DEFINER, they run as the caller, but they write to cron.job through pg_cron's own internal C code, not a normal caller-privileged INSERT or UPDATE. A role with only GRANT USAGE ON SCHEMA cron and GRANT SELECT on both tables can schedule, list, and unschedule its own jobs through those functions, while a raw INSERT or UPDATE against cron.job as that role is refused outright, permission denied, no row-level security involved at all, since the role was never granted write access in the first place. Ownership introduced a write path that had to be locked back down; the narrower grant never opens one. Adds pg_cron to the test harness's standard-flavor preload and a real end-to-end test: schedule, list, unschedule, and a raw write correctly refused.
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Inline comments:
In `@tests/main.go`:
- Around line 1111-1112: Update the test command invoking cron.unschedule to
require output equal to “t” instead of using expectSuccess, ensuring the probe
job is confirmed removed. Preserve the existing SQL command and surrounding test
setup.
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extension-custom-scripts/pg_cron/after-create.sqltests/main.go
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…t coverage Removes lolor/before-create.sql: the event trigger in drydock's own Cluster CR already blocks CREATE EXTENSION lolor outright, cluster-wide, making this script's spock-presence check redundant. Drops it, its test, and the README reference to it as a pattern example. Drops stale "an earlier version of this script did X" history from the pg_cron after-create.sql comment and its matching test comment; not relevant to understanding the current behavior. Adds test coverage for pg_tokenizer, vchord_bm25, postgis_tiger_geocoder, and postgis_topology's after-create.sql scripts, each installing through the gate as the database's own non-superuser owner and then exercising a real query or action the grant actually enables, not just an ACL check. pg_tokenizer needs shared_preload_libraries to install at all, so the test runner's standard-flavor library list picks it up too. Tightens the pg_cron unschedule test: it previously accepted any successful exit code, which would pass even if the job was never actually removed, since cron.unschedule() returns a boolean rather than erroring on a no-op. Now requires the result to be true. Bumps the epoch to -3 for every existing image line in build_pgedge_images.py, so this branch's changes land in a freshly rebuilt internal image tag.
pg_database_owner's grants only reach the database's owner and roles that inherit from it. A role a customer creates directly, a reporting login or a per-service user, has no path to any of it: the grant carries no GRANT OPTION, so the owner can't pass it on either, and the attempt isn't even an error, GRANT USAGE ON SCHEMA tiger TO some_role silently grants nothing, confirmed directly. Adds PUBLIC alongside pg_database_owner on the read side of address_standardizer_data_us, pg_tokenizer, postgis_tiger_geocoder, and vchord_bm25. pg_cron is deliberately left out, cron.job is already scoped per username by its own row-level security policy. tokenizer_catalog's write side stays restricted either way. Schema USAGE on tokenizer_catalog does more than unlock reading the tables above: it makes every function in the schema callable, since Postgres grants EXECUTE on new functions to PUBLIC by default. Most of that surface manages tokenizer/model configuration and safely refuses on table ACL when called this way, none of it is SECURITY DEFINER, confirmed directly. But create_huggingface_model and create_lindera_model run real work, config parsing and an attempted model load, before any permission check fires, and this is reachable from a live network. Revokes EXECUTE from PUBLIC on every function in the schema, keeps it explicit for pg_database_owner rather than leaving that dependent on the PUBLIC default just revoked, then re-grants PUBLIC only the three functions the read-only use case needs: tokenize(), apply_text_analyzer(), and list_preload_models(). Confirmed the legitimate configuration path survives this unchanged: a role with pg_write_all_data can still create a tokenizer end to end. Also fixes postgis_topology's after-create.sql comment, which claimed its ownership reassignment was "the same approach used for pg_cron's job tables." That stopped being true once pg_cron's script dropped ownership entirely. Replaces it with the actual reason ownership stays necessary here: postgis_topology's functions run as the caller through ordinary ACL-checked DML, unlike pg_cron's, which bypass ACL checks through internal C code, so RenameTopoGeometryColumn()'s ALTER TABLE ... DISABLE TRIGGER call has no GRANT that covers it, confirmed directly against a grant-only setup with full DML and even TRIGGER privilege on both tables. Adds real test coverage throughout: a genuine third-party role, not the owner and not a member of pg_database_owner, reaching all four PUBLIC-granted extensions while an owner's own attempt to re-grant by hand is confirmed a silent no-op; that same role refused the tokenizer_catalog config-management functions but keeping the three read-only ones; and postgis_topology's test extended past CreateTopology(), which passes under a plain grant and proves nothing on its own, through AddTopoGeometryColumn(), RenameTopoGeometryColumn() (the one call that actually requires ownership), and DropTopology().
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What this does
supautils' extension gate installs a gated extension by switching the
session to a designated superuser for the duration of the install
(
supautils.privileged_extensions_superuser). That's necessary forextensions that need superuser to install at all, but it means the
objects they create, schemas, tables, sequences, land owned by that
superuser, not by whoever actually ran
CREATE EXTENSIONor by thedatabase's own owner. Anyone using supautils' gate for extensions that
create real schema objects runs into this, not something specific to
one deployment.
Adds
extension-custom-scripts/for six such extensions, usingsupautils' own convention (
before-create.sql/after-create.sqlunder
supautils.extension_custom_scripts_path, see this directory'sREADME):
pg_tokenizer: grants USAGE + SELECT ontokenizer_catalogtopg_database_ownerandPUBLIC, but revokesEXECUTEfromPUBLICon every function in the schema first and re-grants itonly on
tokenize(),apply_text_analyzer(), andlist_preload_models(), the three the read-only use case needs(see below).
vchord_bm25: grants USAGE onbm25_catalogtopg_database_ownerand
PUBLIC.postgis_tiger_geocoder: grants USAGE + SELECT ontigertopg_database_ownerandPUBLIC.address_standardizer_data_us: grants SELECT on its referencetables to
pg_database_ownerandPUBLIC, looking up the schemathey actually landed in at runtime rather than assuming
public,since this is the one extension in the list that's relocatable.
pg_cron: grants USAGE oncronand SELECT oncron.job/cron.job_run_detailstopg_database_owner, no ownership change.cron.schedule()/cron.unschedule()write tocron.jobthroughpg_cron's own internal code, not a caller-privileged INSERT or
UPDATE, so SELECT is enough for the database's owner to manage its
own jobs; a raw write against the table is refused outright for a
role with only this grant. A role that separately holds broader
table-level write access is a different case, bounded instead by
the table's own row-level security policy, not by anything this
script grants.
postgis_topology: reassignstopology.topology/topology.layerownership topg_database_owner, covering thefull create/rename/drop lifecycle (PostGIS's own install script
already grants
PUBLICread access directly, this covers the writeside).
Every script grants to
pg_database_owner, Postgres's own predefinedrole that automatically tracks whoever currently owns the database,
rather than a hardcoded role name, so a script here keeps working
regardless of what a consumer names its own roles or reassigns
ownership to later.
Also bumps the epoch to
-3for every existing image line inscripts/build_pgedge_images.py, at Matt's request, so this PR'schange is reflected in a rebuilt internal image tag.
Worth reviewing
pg_database_owneris Postgres's own predefined role(postgresql.org/docs/current/predefined-roles.html), used
throughout instead of a hardcoded name.
PUBLICas well aspg_database_owner,not just the database's owner:
pg_database_owner's own grantcarries no GRANT OPTION, so the owner has no way to pass access on
to a role it creates itself, a reporting login or a per-service
user, and the attempt is not even an error,
GRANT USAGE ON SCHEMA tiger TO some_rolesilently grants nothing, confirmed directly.Safe to open widely since all four are reference data or a type
schema rather than anything a consumer writes to itself, and
PostGIS's own install script already grants
PUBLICread access toits
topologyschema the same way.pg_cronandpostgis_topologyare deliberately left out of this, for the reasons already covered
below.
USAGEontokenizer_catalogdoes more than unlock readingthe tables above: it makes every function in the schema callable by
any role, since Postgres grants
EXECUTEon new functions toPUBLICby default. Most of that surface manages tokenizer/modelconfiguration and correctly refuses on table ACL when called this
way, none of it
SECURITY DEFINER, confirmed directly. Butcreate_huggingface_model/create_lindera_modelrun real work,config parsing and an attempted model load, before any permission
check fires, reachable from a live network connection. Revokes
EXECUTEfromPUBLICon every function in the schema, re-grantsit explicitly to
pg_database_ownerso that access no longerdepends on the default just revoked, then re-grants
PUBLIConlythe three functions the read-only case needs. Confirmed the
legitimate configuration path is unaffected: a role with
pg_write_all_datacan still create a tokenizer end to end.pg_cron's grant is SELECT-only, not ownership: confirmed directlythat
cron.schedule()/cron.unschedule()work for a role with justthat grant, and that a raw INSERT/UPDATE against
cron.jobfrom thesame role is refused, permission denied, no ownership involved at
all. A role that separately holds broader table-level write access,
through a predefined role like
pg_write_all_data, for example, canalready write to
cron.jobdirectly regardless of this script;what stops it from writing a row for a different role is the
table's own row-level security policy, confirmed directly: the same
insert with someone else's username fails with a row-level security
violation, not a permission error.
postgis_topologykeeps the ownership handoff rather than aSELECT-only grant like
pg_cron: confirmedRenameTopoGeometryColumn()runs
ALTER TABLE topology.layer DISABLE TRIGGER, which only anowner or superuser can do, no GRANT covers it. Its functions run as
the caller through ordinary ACL-checked DML, unlike
pg_cron's,which bypass ACL checks through internal C code.
postgis_topology's script reassigns ownership on exactly the twotables that need it, not the whole schema, so it doesn't also hand
the owner write access to some other extension's objects that
happen to live in the same schema.
address_standardizer_data_uslooks its schema up viapg_extension.extnamespacerather than supautils'@extschema@substitution: that token is populated only when the caller's
CREATE EXTENSIONincluded an explicitSCHEMAclause, and isotherwise substituted as SQL
NULL, which is the common case.Every other script here hardcodes its schema name instead, since
each of those extensions' own
.controlfiles mark itrelocatable = false, Postgres itself refuses (or silently ignores)any attempt to install them elsewhere, checked directly against
each one.
image does with the same supautils mechanism, as a gut check, not to
match it: they ship the same kind of per-extension handoff, ten
after-create.sqlscripts, including one forpg_cronand one forpostgis_tiger_geocoder, plus a separate globalbefore-create.sqlfor a different purpose entirely (pre-installing TLE dependencies
for a cascaded install). Their
pg_cronscript lands on the samecall worth noting: it revokes ownership-level access back down and
re-grants
SELECTonly oncron.job, an independent arrival at thesame SELECT-only decision this PR makes, by a different team solving
the same problem. Two of their other settings are worth knowing
about for anyone tuning this further:
supautils.privileged_role_allowed_configs(which sessionparameters a privileged role can adjust beyond the extension gate)
and
supautils.restrict_extension_versions, neither of which thisPR touches.
Tested
Every one of the six scripts, verified two ways:
superuser context supautils would use it in, right after each
extension's own
CREATE EXTENSION, against a fresh container ofthe currently published image, then confirming the non-superuser
owner's access afterward. For
pg_cronandpostgis_topologyspecifically, confirmed with a real functional call
(
cron.schedule(),topology.CreateTopology()), not only an ACLcheck.
tests/main.gocovering everyscript: a non-superuser role installing an allowlisted extension
through the gate and refused a non-allowlisted one,
address_standardizer_data_us's grant landing correctly both withand without an explicit
SCHEMAclause,pg_cron's schedule/list/unschedule working with no ownership and a raw write refused,
pg_tokenizer/vchord_bm25/postgis_tiger_geocoder/postgis_topologyeach granting the access their after-create.sqldocuments (
postgis_topology's extends pastCreateTopology(),which passes under a plain grant and proves nothing on its own,
through
AddTopoGeometryColumn(),RenameTopoGeometryColumn(),the one call that actually needs ownership, and
DropTopology()),and a genuine third-party role (not the owner, not a member of
pg_database_owner) reaching all fourPUBLIC-granted extensionswhile the owner's own attempt to re-grant by hand is confirmed a
silent no-op, refused the
tokenizer_catalogconfig-managementfunctions outright, and still keeping the three read-only ones.
Ran the full suite (
go run main.go, bothminimalandstandardflavors) against a local image built by layering this branch's
extension-custom-scripts/onto the real published base, all 59tests passing.
Not yet tested: a full image built from this branch's own Dockerfile
through the normal package-based build. The SQL each script runs, and
the tests that exercise it, are verified correct; getting this into a
published image is the remaining step.