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# Copyright (c) 2021-2023, PostgreSQL Global Development Group
# Tests for peer authentication and user name map.
# The test is skipped if the platform does not support peer authentication,
# and is only able to run with Unix-domain sockets.
use strict;
use warnings;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
if (!$use_unix_sockets)
{
plan skip_all =>
"authentication tests cannot run without Unix-domain sockets";
}
# Delete pg_hba.conf from the given node, add a new entry to it
# and then execute a reload to refresh it.
sub reset_pg_hba
{
my $node = shift;
my $hba_method = shift;
unlink($node->data_dir . '/pg_hba.conf');
$node->append_conf('pg_hba.conf', "local all all $hba_method");
$node->reload;
return;
}
# Delete pg_ident.conf from the given node, add a new entry to it
# and then execute a reload to refresh it.
sub reset_pg_ident
{
my $node = shift;
my $map_name = shift;
my $system_user = shift;
my $pg_user = shift;
unlink($node->data_dir . '/pg_ident.conf');
$node->append_conf('pg_ident.conf', "$map_name $system_user $pg_user");
$node->reload;
return;
}
# Test access for a single role, useful to wrap all tests into one.
sub test_role
{
local $Test::Builder::Level = $Test::Builder::Level + 1;
my ($node, $role, $method, $expected_res, $test_details, %params) = @_;
my $status_string = 'failed';
$status_string = 'success' if ($expected_res eq 0);
my $connstr = "user=$role";
my $testname =
"authentication $status_string for method $method, role $role "
. $test_details;
if ($expected_res eq 0)
{
$node->connect_ok($connstr, $testname, %params);
}
else
{
# No checks of the error message, only the status code.
$node->connect_fails($connstr, $testname, %params);
}
}
# Find $pattern in log file of $node.
sub find_in_log
{
my ($node, $offset, $pattern) = @_;
my $log = PostgreSQL::Test::Utils::slurp_file($node->logfile, $offset);
return 0 if (length($log) <= 0);
return $log =~ m/$pattern/;
}
my $node = PostgreSQL::Test::Cluster->new('node');
$node->init;
$node->append_conf('postgresql.conf', "log_connections = on\n");
$node->start;
# Set pg_hba.conf with the peer authentication.
reset_pg_hba($node, 'peer');
# Check if peer authentication is supported on this platform.
my $log_offset = -s $node->logfile;
$node->psql('postgres');
if (find_in_log(
$node, $log_offset,
qr/peer authentication is not supported on this platform/))
{
plan skip_all => 'peer authentication is not supported on this platform';
}
# Add a database role, to use for the user name map.
$node->safe_psql('postgres', qq{CREATE ROLE testmapuser LOGIN});
# Extract as well the system user for the user name map.
my $system_user =
$node->safe_psql('postgres',
q(select (string_to_array(SYSTEM_USER, ':'))[2]));
# Tests without the user name map.
# Failure as connection is attempted with a database role not mapping
# to an authorized system user.
test_role(
$node, qq{testmapuser}, 'peer', 2,
'without user name map',
log_like => [qr/Peer authentication failed for user "testmapuser"/]);
# Tests with a user name map.
reset_pg_ident($node, 'mypeermap', $system_user, 'testmapuser');
reset_pg_hba($node, 'peer map=mypeermap');
# Success as the database role matches with the system user in the map.
test_role($node, qq{testmapuser}, 'peer', 0, 'with user name map',
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Test with regular expression in user name map.
# Extract the last 3 characters from the system_user
# or the entire system_user (if its length is <= -3).
my $regex_test_string = substr($system_user, -3);
# Success as the regular expression matches.
reset_pg_ident($node, 'mypeermap', qq{/^.*$regex_test_string\$},
'testmapuser');
test_role(
$node,
qq{testmapuser},
'peer',
0,
'with regular expression in user name map',
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Success as the regular expression matches and \1 is replaced in the given
# subexpression.
reset_pg_ident($node, 'mypeermap', qq{/^$system_user(.*)\$}, 'test\1mapuser');
test_role(
$node,
qq{testmapuser},
'peer',
0,
'with regular expression in user name map with \1 replaced',
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Success as the regular expression matches and \1 is replaced in the given
# subexpression, even if quoted.
reset_pg_ident($node, 'mypeermap', qq{/^$system_user(.*)\$},
'"test\1mapuser"');
test_role(
$node,
qq{testmapuser},
'peer',
0,
'with regular expression in user name map with quoted \1 replaced',
log_like =>
[qr/connection authenticated: identity="$system_user" method=peer/]);
# Failure as the regular expression does not include a subexpression, but
# the database user contains \1, requesting a replacement.
reset_pg_ident($node, 'mypeermap', qq{/^$system_user\$}, '\1testmapuser');
test_role(
$node,
qq{testmapuser},
'peer', 2,
'with regular expression in user name map with \1 not replaced',
log_like => [
qr/regular expression "\^$system_user\$" has no subexpressions as requested by backreference in "\\1testmapuser"/
]);
# Concatenate system_user to system_user.
$regex_test_string = $system_user . $system_user;
# Failure as the regular expression does not match.
reset_pg_ident($node, 'mypeermap', qq{/^.*$regex_test_string\$},
'testmapuser');
test_role(
$node,
qq{testmapuser},
'peer',
2,
'with regular expression in user name map',
log_like => [qr/no match in usermap "mypeermap" for user "testmapuser"/]);
done_testing();
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