public/postgresql_passchanger_function
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dodger 2022-05-09 17:56:08 +02:00
parent 8f3c580bb4
commit 270db13e60
Signed by: dodger
GPG Key ID: F6701F6CB4D1C826
4 changed files with 49 additions and 46 deletions
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6
README.md
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@ -5,6 +5,12 @@
This project tries to find a way to allow users the management of the `VALID UNTIL` expiration clause by themself.
All without granting `super` permissions and having a histoc of changes on a _pseudo-audit_ table
| :warning: WARNING |
|:---------------------------|
| Amazon RDS has its own instructions on README_RDS.md |
|:---------------------------|
| :warning: WARNING |
## Instructions
### First deploy

2
grants_to_grant_rds.sql
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@ -5,7 +5,7 @@ grant usage on schema dba to dodger ;
-- grant execute on the function change_my_password
grant execute on function dba.change_my_password(text) to dodger;
-- grant execute on the function change_valid_until
grant execute on function dba.change_valid_until(text) to dodger;
grant execute on function dba.change_valid_until(text, text) to dodger;
-- only insert is needed to allow audit trace
GRANT INSERT ON TABLE dba.pwdhistory TO dodger;

22
passchanger.sql
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@ -49,30 +49,35 @@ AS $BODY$
declare
_invokingfunction text := '';
_matches text;
_password_lifetime int := 120; -- specify password lifetime
--_password_lifetime text := '120 days'; -- specify password lifetime
_retval INTEGER;
_expiration_date text;
begin
select now() + interval '120 days' into _expiration_date ;
select query into _invokingfunction from pg_stat_activity where pid = pg_backend_pid() ;
-- first, checking the invoking function
-- raise notice 'Invoking function: %', _invokingfunction;
--_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(''([[:alnum:]]|@|\\$|#|%|\\^|&|\\*|\\(|\\)|\\_|\\+|\\{|\\}|\\||<|>|\\?|=|!){11,100}''\\)[[:space:]]{0,};' , 'i');
_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(.*\\)[[:space:]]{0,};' , 'i');
-- raise notice 'Matches: %', _matches;
if _matches IS NOT NULL then
-- then checking the regex for the password
EXECUTE format('update pg_catalog.pg_authid set rolvaliduntil=now() + interval ''120 days'' where rolname=''%I'' ', _usename);
return 0;
_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(''([[:alnum:]]|@|\\$|#|%|\\^|&|\\*|\\(|\\)|\\_|\\+|\\{|\\}|\\||<|>|\\?|=|!){11,100}''\\)[[:space:]]{0,};' , 'i');
if _matches IS NOT NULL then
--EXECUTE format('update pg_catalog.pg_authid set rolvaliduntil=now() + interval ''120 days'' where rolname=''%I'' ', _usename);
EXECUTE format('ALTER ROLE ''%I'' WITH PASSWORD ''%L'' VALID UNTIL now() + interval ''%I days'' ;', _usename, _thepassword, _password_lifetime)
INTO _retval;
RETURN _retval;
EXECUTE format('ALTER ROLE %I WITH PASSWORD %L VALID UNTIL now() + interval ''%I days'' ;', _usename, _thepassword, _password_lifetime);
-- INTO _retval;
RETURN 0;
else
raise exception 'Regular expresion for password check failed'
using errcode = '22023' -- 22023 = "invalid_parameter_value'
, detail = 'Check your generated password an try again'
, hint = 'Read the official documentation' ;
end if;
else -- also catches NULL
else
-- also catches NULL
-- raise custom error
raise exception 'You''re not allowed to run this function directly'
using errcode = '22023' -- 22023 = "invalid_parameter_value'
@ -82,11 +87,9 @@ begin
end
$BODY$;
ALTER FUNCTION dba.change_valid_until(text)
OWNER TO dba;
ALTER FUNCTION dba.change_valid_until(text) OWNER TO dba;
REVOKE EXECUTE ON FUNCTION dba.change_valid_until(text) From PUBLIC;
CREATE OR REPLACE FUNCTION dba.change_my_password(_password text)
RETURNS integer
SECURITY INVOKER
@ -131,7 +134,6 @@ begin
end
$BODY$;
ALTER FUNCTION dba.change_my_password(text)
OWNER TO dba;
ALTER FUNCTION dba.change_my_password(text) OWNER TO dba;
REVOKE EXECUTE ON FUNCTION dba.change_my_password(text) From PUBLIC;

25
passchanger_rds.sql
View File

@ -52,23 +52,23 @@ AS $BODY$
declare
_invokingfunction text := '';
_matches text;
_password_lifetime int := 120; -- specify password lifetime
--_password_lifetime text := '120 days'; -- specify password lifetime
_retval INTEGER;
_expiration_date text;
begin
select now() + interval '120 days' into _expiration_date ;
select query into _invokingfunction from pg_stat_activity where pid = pg_backend_pid() ;
-- raise notice 'Invoking function: %', _invokingfunction;
--_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(''([[:alnum:]]|@|\\$|#|%|\\^|&|\\*|\\(|\\)|\\_|\\+|\\{|\\}|\\||<|>|\\?|=|!){11,100}''\\)[[:space:]]{0,};' , 'i');
-- first, checking the invoking function
_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(.*\\)[[:space:]]{0,};' , 'i');
-- raise notice 'Matches: %', _matches;
if _matches IS NOT NULL then
-- _matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(''([[:alnum:]]|@|\\$|#|%|\\^|&|\\*|\\(|\\)|\\_|\\+|\\{|\\}|\\||<|>|\\?|=|!){11,100}''\\)[[:space:]]{0,};' , 'i');
_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(.*\\)[[:space:]]{0,};' , 'i');
-- then checking the regex for the password
_matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\([[:space:]]{0,}''([[:alnum:]]|@|\\$|#|%|\\^|&|\\*|\\(|\\)|\\_|\\+|\\{|\\}|\\||<|>|\\?|=|!){11,100}''[[:space:]]{0,}\\)[[:space:]]{0,};' , 'i');
-- catch-all regexp, avoid using it
-- _matches := regexp_matches(_invokingfunction, E'select dba\.change_my_password\\(.*\\)[[:space:]]{0,};' , 'i');
if _matches IS NOT NULL then
--EXECUTE format('update pg_catalog.pg_authid set rolvaliduntil=now() + interval ''120 days'' where rolname=''%I'' ', _usename);
EXECUTE format('ALTER ROLE %I WITH PASSWORD %L VALID UNTIL ''%I'' ;', _usename, _thepassword, _expiration_date);
--EXECUTE format('ALTER ROLE %I WITH PASSWORD %L VALID UNTIL now() + interval ''120 days'' ;', _usename, _thepassword);
--EXECUTE format('ALTER ROLE %I WITH PASSWORD %L VALID UNTIL now() + interval %L days ;', _usename, _thepassword, _password_lifetime);
EXECUTE format('ALTER ROLE %I WITH PASSWORD %L VALID UNTIL %L ;', _usename, _thepassword, _expiration_date);
-- INTO _retval;
RETURN 0;
else
@ -77,7 +77,8 @@ begin
, detail = 'Check your generated password (' || _thepassword || ') an try again'
, hint = 'Read the official documentation' ;
end if;
else -- also catches NULL
else
-- also catches NULL
-- raise custom error
raise exception 'You''re not allowed to run this function directly'
using errcode = '22023' -- 22023 = "invalid_parameter_value'
@ -87,11 +88,9 @@ begin
end
$BODY$;
-- ALTER FUNCTION dba.change_valid_until(text, text) OWNER TO postgres;
ALTER FUNCTION dba.change_valid_until(text, text) OWNER TO dba;
REVOKE EXECUTE ON FUNCTION dba.change_valid_until(text, text) From PUBLIC;
CREATE OR REPLACE FUNCTION dba.change_my_password(_password text)
RETURNS integer
SECURITY INVOKER
@ -129,10 +128,6 @@ begin
(usename, usename_addres, application_name, password, changed_on)
values (_usename, _useraddress, _userapp, md5(_password),now());
--
--
--
return 0;
end
$BODY$;