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7eeb1d9861
Hostile objects located within the installation-time search_path could
capture references in an extension's installation or upgrade script.
If the extension is being installed with superuser privileges, this
opens the door to privilege escalation. While such hazards have existed
all along, their urgency increases with the v13 "trusted extensions"
feature, because that lets a non-superuser control the installation path
for a superuser-privileged script. Therefore, make a number of changes
to make such situations more secure:
* Tweak the construction of the installation-time search_path to ensure
that references to objects in pg_catalog can't be subverted; and
explicitly add pg_temp to the end of the path to prevent attacks using
temporary objects.
* Disable check_function_bodies within installation/upgrade scripts,
so that any security gaps in SQL-language or PL-language function bodies
cannot create a risk of unwanted installation-time code execution.
* Adjust lookup of type input/receive functions and join estimator
functions to complain if there are multiple candidate functions. This
prevents capture of references to functions whose signature is not the
first one checked; and it's arguably more user-friendly anyway.
* Modify various contrib upgrade scripts to ensure that catalog
modification queries are executed with secure search paths. (These
are in-place modifications with no extension version changes, since
it is the update process itself that is at issue, not the end result.)
Extensions that depend on other extensions cannot be made fully secure
by these methods alone; therefore, revert the "trusted" marking that
commit eb67623c9 applied to earthdistance and hstore_plperl, pending
some better solution to that set of issues.
Also add documentation around these issues, to help extension authors
write secure installation scripts.
Patch by me, following an observation by Andres Freund; thanks
to Noah Misch for review.
Security: CVE-2020-14350
99 lines
3.2 KiB
SQL
99 lines
3.2 KiB
SQL
/* contrib/earthdistance/earthdistance--1.1.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION earthdistance" to load this file. \quit
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-- earth() returns the radius of the earth in meters. This is the only
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-- place you need to change things for the cube base distance functions
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-- in order to use different units (or a better value for the Earth's radius).
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CREATE FUNCTION earth() RETURNS float8
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LANGUAGE SQL IMMUTABLE PARALLEL SAFE
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AS 'SELECT ''6378168''::float8';
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-- Astronomers may want to change the earth function so that distances will be
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-- returned in degrees. To do this comment out the above definition and
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-- uncomment the one below. Note that doing this will break the regression
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-- tests.
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--
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-- CREATE FUNCTION earth() RETURNS float8
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-- LANGUAGE SQL IMMUTABLE
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-- AS 'SELECT 180/pi()';
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-- Define domain for locations on the surface of the earth using a cube
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-- datatype with constraints. cube provides 3D indexing.
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-- The cube is restricted to be a point, no more than 3 dimensions
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-- (for less than 3 dimensions 0 is assumed for the missing coordinates)
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-- and that the point must be very near the surface of the sphere
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-- centered about the origin with the radius of the earth.
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CREATE DOMAIN earth AS cube
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CONSTRAINT not_point check(cube_is_point(value))
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CONSTRAINT not_3d check(cube_dim(value) <= 3)
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CONSTRAINT on_surface check(abs(cube_distance(value, '(0)'::cube) /
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earth() - '1'::float8) < '10e-7'::float8);
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CREATE FUNCTION sec_to_gc(float8)
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RETURNS float8
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT CASE WHEN $1 < 0 THEN 0::float8 WHEN $1/(2*earth()) > 1 THEN pi()*earth() ELSE 2*earth()*asin($1/(2*earth())) END';
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CREATE FUNCTION gc_to_sec(float8)
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RETURNS float8
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT CASE WHEN $1 < 0 THEN 0::float8 WHEN $1/earth() > pi() THEN 2*earth() ELSE 2*earth()*sin($1/(2*earth())) END';
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CREATE FUNCTION ll_to_earth(float8, float8)
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RETURNS earth
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT cube(cube(cube(earth()*cos(radians($1))*cos(radians($2))),earth()*cos(radians($1))*sin(radians($2))),earth()*sin(radians($1)))::earth';
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CREATE FUNCTION latitude(earth)
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RETURNS float8
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT CASE WHEN cube_ll_coord($1, 3)/earth() < -1 THEN -90::float8 WHEN cube_ll_coord($1, 3)/earth() > 1 THEN 90::float8 ELSE degrees(asin(cube_ll_coord($1, 3)/earth())) END';
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CREATE FUNCTION longitude(earth)
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RETURNS float8
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT degrees(atan2(cube_ll_coord($1, 2), cube_ll_coord($1, 1)))';
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CREATE FUNCTION earth_distance(earth, earth)
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RETURNS float8
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT sec_to_gc(cube_distance($1, $2))';
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CREATE FUNCTION earth_box(earth, float8)
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RETURNS cube
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LANGUAGE SQL
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IMMUTABLE STRICT
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PARALLEL SAFE
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AS 'SELECT cube_enlarge($1, gc_to_sec($2), 3)';
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--------------- geo_distance
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CREATE FUNCTION geo_distance (point, point)
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RETURNS float8
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LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE AS 'MODULE_PATHNAME';
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--------------- geo_distance as operator <@>
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CREATE OPERATOR <@> (
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LEFTARG = point,
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RIGHTARG = point,
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PROCEDURE = geo_distance,
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COMMUTATOR = <@>
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);
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