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Tests: add PP2_CLIENT_CERT_SESS client flag test.

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Verify that the PP2_CLIENT_SSL bit (0x01) is always set when any
ssl sub-TLV is present, and that PP2_CLIENT_CERT_SESS (0x04) is
added only when the ssl_cn sub-TLV is configured.

Two plain-TCP servers exercise the contrast:
  - ssl_version only  → client byte 0x01
  - ssl_version + ssl_cn → client byte 0x05

PP2_CLIENT_CERT_CONN (0x02) requires an actual TLS downstream
connection and is covered by the SSL test suite.
This commit is contained in:
Vadim Zhestikov 2026-04-16 13:53:44 -07:00
parent 59ec2ee651
commit f7c5aae568
1 changed files with 173 additions and 0 deletions
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173
t/stream_proxy_protocol_v2_client_flags.t Normal file
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#!/usr/bin/perl
# (C) Nginx, Inc.
# Tests for PP2_CLIENT_CERT_SESS flag in the PP2_TYPE_SSL client byte.
# PP2_CLIENT_SSL (0x01) is always set when any ssl sub-TLV is present.
# PP2_CLIENT_CERT_SESS (0x04) is set when the ssl_cn sub-TLV is configured.
# PP2_CLIENT_CERT_CONN (0x02) requires a TLS downstream connection; tested
# separately in the SSL test suite.
###############################################################################
use warnings;
use strict;
use Test::More;
use IO::Select;
use IO::Socket::INET;
BEGIN { use FindBin; chdir($FindBin::Bin); }
use lib 'lib';
use Test::Nginx;
use Test::Nginx::Stream qw/ stream /;
###############################################################################
select STDERR; $| = 1;
select STDOUT; $| = 1;
my $t = Test::Nginx->new()->has(qw/stream/)->plan(14)
->write_file_expand('nginx.conf', <<'EOF');
%%TEST_GLOBALS%%
daemon off;
events {
}
stream {
%%TEST_GLOBALS_STREAM%%
# Server 1: ssl sub-TLV without ssl_cn
# client byte must be PP2_CLIENT_SSL (0x01) only
server {
listen 127.0.0.1:%%PORT_8080%%;
proxy_pass 127.0.0.1:%%PORT_8082%%;
proxy_protocol on;
proxy_protocol_version 2;
proxy_protocol_tlv ssl_version "TLSv1.3";
}
# Server 2: ssl sub-TLVs including ssl_cn
# client byte must be PP2_CLIENT_SSL|PP2_CLIENT_CERT_SESS (0x05)
server {
listen 127.0.0.1:%%PORT_8081%%;
proxy_pass 127.0.0.1:%%PORT_8082%%;
proxy_protocol on;
proxy_protocol_version 2;
proxy_protocol_tlv ssl_version "TLSv1.3";
proxy_protocol_tlv ssl_cn "example.com";
}
}
EOF
$t->run_daemon(\&stream_daemon, port(8082));
$t->run();
$t->waitforsocket('127.0.0.1:' . port(8082));
###############################################################################
# Server 1: ssl_version only, no ssl_cn
#
# Fixed header (16) + IPv4 addr block (12) + outer 0x20 TLV (18) = 46 bytes
# header->len = 12 + 18 = 30
#
# outer 0x20 TLV value = client(1) + verify(4) + ssl_version TLV(10) = 15 bytes
# client byte = 0x01: PP2_CLIENT_SSL only; ssl_cn absent so no CERT_SESS
# ssl_version [36]: type 0x21, len 7, value "TLSv1.3"
# payload at offset 46
my $d1 = stream('127.0.0.1:' . port(8080))->io('hello');
is(unpack('n', substr($d1, 14, 2)), 30, 'no_cn len field');
is(unpack('C', substr($d1, 28, 1)), 0x20, 'no_cn outer type');
is(unpack('n', substr($d1, 29, 2)), 15, 'no_cn outer length');
is(unpack('C', substr($d1, 31, 1)), 0x01, 'no_cn client flags');
is(unpack('C', substr($d1, 36, 1)), 0x21, 'no_cn ssl_version type');
is(substr($d1, 46), 'hello', 'no_cn payload after header');
# Server 2: ssl_version + ssl_cn
#
# Fixed header (16) + IPv4 addr block (12) + outer 0x20 TLV (32) = 60 bytes
# header->len = 12 + 32 = 44
#
# outer 0x20 TLV value = client(1) + verify(4) + sub-TLVs(24) = 29 bytes
# client byte = 0x05: PP2_CLIENT_SSL|PP2_CLIENT_CERT_SESS (ssl_cn is set)
# ssl_version [36]: type 0x21, len 7, value "TLSv1.3"
# ssl_cn [46]: type 0x22, len 11, value "example.com"
# payload at offset 60
my $d2 = stream('127.0.0.1:' . port(8081))->io('hello');
is(unpack('n', substr($d2, 14, 2)), 44, 'with_cn len field');
is(unpack('C', substr($d2, 28, 1)), 0x20, 'with_cn outer type');
is(unpack('n', substr($d2, 29, 2)), 29, 'with_cn outer length');
is(unpack('C', substr($d2, 31, 1)), 0x05, 'with_cn client flags');
is(unpack('C', substr($d2, 36, 1)), 0x21, 'with_cn ssl_version type');
is(unpack('C', substr($d2, 46, 1)), 0x22, 'with_cn ssl_cn type');
is(substr($d2, 49, 11), 'example.com', 'with_cn ssl_cn value');
is(substr($d2, 60), 'hello', 'with_cn payload after header');
###############################################################################
sub stream_daemon {
my ($port) = @_;
my $server = IO::Socket::INET->new(
Proto => 'tcp',
LocalAddr => '127.0.0.1:' . $port,
Listen => 5,
Reuse => 1,
) or die "Can't create listening socket: $!\n";
my $sel = IO::Select->new($server);
local $SIG{PIPE} = 'IGNORE';
while (my @ready = $sel->can_read) {
foreach my $fh (@ready) {
if ($server == $fh) {
my $new = $fh->accept;
$new->autoflush(1);
$sel->add($new);
} elsif (stream_handle_client($fh)) {
$sel->remove($fh);
$fh->close;
}
}
}
}
sub stream_handle_client {
my ($client) = @_;
log2c("(new connection $client)");
my $buffer = '';
my $csel = IO::Select->new($client);
while ($csel->can_read(0.5)) {
my $n = $client->sysread(my $chunk, 65536);
last unless $n;
$buffer .= $chunk;
}
log2i("$client recv " . length($buffer) . " bytes");
$client->syswrite($buffer);
log2o("$client sent " . length($buffer) . " bytes");
return 1;
}
sub log2i { Test::Nginx::log_core('|| <<', @_); }
sub log2o { Test::Nginx::log_core('|| >>', @_); }
sub log2c { Test::Nginx::log_core('||', @_); }
###############################################################################