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/usr/share/postgresql/10/extension/sslinfo--1.2.sql is in postgresql-10 10.3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* contrib/sslinfo/sslinfo--1.2.sql */

-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION sslinfo" to load this file. \quit

CREATE FUNCTION ssl_client_serial() RETURNS numeric
AS 'MODULE_PATHNAME', 'ssl_client_serial'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_is_used() RETURNS boolean
AS 'MODULE_PATHNAME', 'ssl_is_used'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_version() RETURNS text
AS 'MODULE_PATHNAME', 'ssl_version'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_cipher() RETURNS text
AS 'MODULE_PATHNAME', 'ssl_cipher'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_client_cert_present() RETURNS boolean
AS 'MODULE_PATHNAME', 'ssl_client_cert_present'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_client_dn_field(text) RETURNS text
AS 'MODULE_PATHNAME', 'ssl_client_dn_field'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_issuer_field(text) RETURNS text
AS 'MODULE_PATHNAME', 'ssl_issuer_field'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_client_dn() RETURNS text
AS 'MODULE_PATHNAME', 'ssl_client_dn'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION ssl_issuer_dn() RETURNS text
AS 'MODULE_PATHNAME', 'ssl_issuer_dn'
LANGUAGE C STRICT PARALLEL RESTRICTED;

CREATE FUNCTION
ssl_extension_info(OUT name text,
    OUT value text,
    OUT critical boolean
) RETURNS SETOF record
AS 'MODULE_PATHNAME', 'ssl_extension_info'
LANGUAGE C STRICT PARALLEL RESTRICTED;