[pve-devel] [PATCH SERIES manager/http-server/docs v2 0/3] fix #5699: add support for real IP

[pve-devel] [PATCH SERIES manager/http-server/docs v2 0/3] fix #5699: add support for real IP

[Thomas Skinner]

This v2 patch series continues adding support for setting a HTTP header for passing through a client IP
address for logging purposes.

Changes since v1:
* fixed styling issues
* renamed fields to clearer, more appropriate names
* adjusted logging format back to previous, made option opt-in


pve-docs:

Thomas Skinner (1):
  fix #5699: pveproxy: add docs for real IP support

 pveproxy.adoc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)


pve-http-server:

Thomas Skinner (1):
  fix #5699: pveproxy: add library methods for real IP support

 src/PVE/APIServer/AnyEvent.pm | 38 ++++++++++++++++++++++++++++++++++-
 src/PVE/APIServer/Utils.pm    | 15 ++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)


pve-manager:

Thomas Skinner (1):
  fix #5699: pveproxy: add settings for real IP support

 PVE/Service/pveproxy.pm | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.39.5


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[pve-devel] [PATCH docs v2 1/3] fix #5699: pveproxy: add docs for real IP support

[Thomas Skinner]

Signed-off-by: Thomas Skinner <thomas@atskinner.net>
---
 pveproxy.adoc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/pveproxy.adoc b/pveproxy.adoc
index 4b5dac0..29f54d7 100644
--- a/pveproxy.adoc
+++ b/pveproxy.adoc
@@ -198,6 +198,35 @@ content, if the client supports it. This can disabled in `/etc/default/pveproxy`
 
  COMPRESSION=0
 
+[[pveproxy_real_ip]]
+Real Client IP Logging
+----------------------
+
+By default, `pveproxy` logs the IP address of the client that sent the request.
+In cases where a proxy server is in front of `pveproxy`, it may be desirable to
+log the IP of the client making the request instead of the proxy IP.
+
+To enable processing of a HTTP header set by the proxy for logging purposes, set 
+`PROXY_REAL_IP_HEADER` to the name of the header to retrieve the client IP from. For
+example:
+
+ PROXY_REAL_IP_HEADER="X-Forwarded-For"
+
+Any invalid values passed in this header will be ignored.
+
+The default behavior is log the value in this header on all incoming requests. 
+To define a list of proxy servers that should be trusted to set the above HTTP
+header, set `PROXY_REAL_IP_ALLOW_FROM`, for example:
+
+ PROXY_REAL_IP_ALLOW_FROM="192.168.0.2"
+
+The `PROXY_REAL_IP_ALLOW_FROM` setting also supports values similar to the `ALLOW_FROM`
+and `DENY_FROM` settings.
+
+IP addresses can be specified using any syntax understood by `Net::IP`. The
+name `all` is an alias for `0/0` and `::/0` (meaning all IPv4 and IPv6
+addresses).
+
 ifdef::manvolnum[]
 include::pve-copyright.adoc[]
 endif::manvolnum[]
-- 
2.39.5


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[pve-devel] [PATCH http-server v2 2/3] fix #5699: pveproxy: add library methods for real IP support

[Thomas Skinner]

Signed-off-by: Thomas Skinner <thomas@atskinner.net>
---
 src/PVE/APIServer/AnyEvent.pm | 38 ++++++++++++++++++++++++++++++++++-
 src/PVE/APIServer/Utils.pm    | 15 ++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/PVE/APIServer/AnyEvent.pm b/src/PVE/APIServer/AnyEvent.pm
index 24209a1..5f15a13 100644
--- a/src/PVE/APIServer/AnyEvent.pm
+++ b/src/PVE/APIServer/AnyEvent.pm
@@ -92,13 +92,14 @@ sub log_request {
     $loginfo->{written} = 1;
 
     my $peerip = $reqstate->{peer_host} || '-';
+    my $realip = $loginfo->{real_ip} || $peerip;
     my $userid = $loginfo->{userid} || '-';
     my $content_length = defined($loginfo->{content_length}) ? $loginfo->{content_length} : '-';
     my $code =  $loginfo->{code} || 500;
     my $requestline = $loginfo->{requestline} || '-';
     my $timestr = strftime("%d/%m/%Y:%H:%M:%S %z", localtime());
 
-    my $msg = "$peerip - $userid [$timestr] \"$requestline\" $code $content_length\n";
+    my $msg = "$realip - $userid [$timestr] \"$requestline\" $code $content_length\n";
 
     $self->write_log($msg);
 }
@@ -1474,6 +1475,18 @@ sub authenticate_and_handle_request {
 
     my $auth = {};
 
+    if (my $proxy_real_ip_header = $self->{proxy_real_ip_header}) {
+	if (my $proxy_real_ip_value = $request->header($proxy_real_ip_header)) {
+	    my $real_ip = Net::IP->new($proxy_real_ip_value);
+	    if (defined($real_ip) && $self->check_allowed_proxy($reqstate->{peer_host})) {
+		$reqstate->{log}->{real_ip} = Net::IP::ip_compress_address(
+		    $real_ip->ip(), 
+		    $real_ip->version(),
+		);
+	    }
+	}
+    }
+
     if ($self->{spiceproxy}) {
 	my $connect_str = $request->header('Host');
 	my ($vmid, $node, $port) = $self->verify_spice_connect_url($connect_str);
@@ -1813,6 +1826,29 @@ sub check_host_access {
     return $match_allow;
 }
 
+sub check_allowed_proxy {
+    my ($self, $client_ip) = @_;
+
+    $client_ip = PVE::APIServer::Utils::normalize_v4_in_v6($client_ip);
+    my $client_ip_object = Net::IP->new($client_ip);
+
+    if (!$client_ip_object) {
+	$self->dprint("client IP not parsable: $@");
+	return 0;
+    }
+
+    if (my $proxy_real_ip_allow_from = $self->{proxy_real_ip_allow_from}) {
+	for my $allowed_net ($proxy_real_ip_allow_from->@*) {
+	    if ($allowed_net->overlaps($client_ip_object)) {
+		$self->dprint("client IP in allowed proxies: ". $allowed_net->print());
+		return 1;
+	    }
+	}
+	return 0;
+    }
+    return 1;
+}
+
 sub accept_connections {
     my ($self) = @_;
 
diff --git a/src/PVE/APIServer/Utils.pm b/src/PVE/APIServer/Utils.pm
index 5728d97..75f72a1 100644
--- a/src/PVE/APIServer/Utils.pm
+++ b/src/PVE/APIServer/Utils.pm
@@ -26,6 +26,8 @@ sub read_proxy_config {
     $shcmd .= 'echo \"COMPRESSION:\$COMPRESSION\";';
     $shcmd .= 'echo \"DISABLE_TLS_1_2:\$DISABLE_TLS_1_2\";';
     $shcmd .= 'echo \"DISABLE_TLS_1_3:\$DISABLE_TLS_1_3\";';
+    $shcmd .= 'echo \"PROXY_REAL_IP_HEADER:\$PROXY_REAL_IP_HEADER\";';
+    $shcmd .= 'echo \"PROXY_REAL_IP_ALLOW_FROM:\$PROXY_REAL_IP_ALLOW_FROM\";';
 
     my $data = -f $conffile ? `bash -c "$shcmd"` : '';
 
@@ -65,6 +67,19 @@ sub read_proxy_config {
 	    $res->{$key} = $value;
 	} elsif ($key eq 'TLS_KEY_FILE') {
 	    $res->{$key} = $value;
+	} elsif ($key eq 'PROXY_REAL_IP_HEADER') {
+	    $res->{$key} = $value;
+	} elsif ($key eq 'PROXY_REAL_IP_ALLOW_FROM') {
+	    my $ips = [];
+	    for my $ip (split(/,/, $value)) {
+		if ($ip eq 'all') {
+		    push @$ips, Net::IP->new('0/0') || die Net::IP::Error() . "\n";
+		    push @$ips, Net::IP->new('::/0') || die Net::IP::Error() . "\n";
+		    next;
+		}
+		push @$ips, Net::IP->new(normalize_v4_in_v6($ip)) || die Net::IP::Error() . "\n";
+	    }
+	    $res->{$key} = $ips;
 	} elsif (grep { $key eq $_ } @$boolean_options) {
 	    die "unknown value '$value' - use 0 or 1\n" if $value !~ m/^(0|1)$/;
 	    $res->{$key} = $value;
-- 
2.39.5


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[pve-devel] [PATCH manager v2 3/3] fix #5699: pveproxy: add settings for real IP support

[Thomas Skinner]

Signed-off-by: Thomas Skinner <thomas@atskinner.net>
---
 PVE/Service/pveproxy.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/PVE/Service/pveproxy.pm b/PVE/Service/pveproxy.pm
index ac108545..df3601bd 100755
--- a/PVE/Service/pveproxy.pm
+++ b/PVE/Service/pveproxy.pm
@@ -115,6 +115,8 @@ sub init {
 	    honor_cipher_order => $proxyconf->{HONOR_CIPHER_ORDER},
 	},
 	compression => $proxyconf->{COMPRESSION},
+	proxy_real_ip_header => $proxyconf->{PROXY_REAL_IP_HEADER},
+	proxy_real_ip_allow_from => $proxyconf->{PROXY_REAL_IP_ALLOW_FROM},
 	# Note: there is no authentication for those pages and dirs!
 	pages => {
 	    '/' => sub { get_index($self->{nodename}, @_) },
-- 
2.39.5


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