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overlay app-containers/docker: fix invalid headers issue with Go 1.19.11
Docker client and daemon started to fail at sending or handling most local connections when being compiled with Go 1.19.11, which addresses CVE-2023-29406 by blocking invalid host headers of HTTP/1. As a workaround, Docker started to define a dummy host header, and to use it for local connections. Backport the fixes to Flatcar to fix the runtime failures. See also https://github.com/moby/moby/issues/45935, https://github.com/moby/moby/pull/45942.
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Dongsu Park
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@ -72,9 +72,13 @@ RESTRICT="installsources strip test"
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S="${WORKDIR}/${P}/src/${EGO_PN}"
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# Flatcar: Dropped outdated bug links, dropped openrc init script patch
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# Flatcar: Dropped outdated bug links, dropped openrc init script patch,
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# backport upstream patches for fixing invalid headers issue when building
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# with Go 1.19.11+.
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PATCHES=(
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"${FILESDIR}/ppc64-buildmode.patch"
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"${FILESDIR}/0001-client-define-a-dummy-hostname-to-use-for-local-conn.patch"
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"${FILESDIR}/0002-pkg-plugins-use-a-dummy-hostname-for-local-connectio.patch"
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)
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# see "contrib/check-config.sh" from upstream's sources
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@ -0,0 +1,161 @@
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From 74b4974cb7e7e81e57661f93b03c94a95a15472e Mon Sep 17 00:00:00 2001
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Message-Id: <74b4974cb7e7e81e57661f93b03c94a95a15472e.1689689028.git.dpark@linux.microsoft.com>
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From: Sebastiaan van Stijn <github@gone.nl>
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Date: Wed, 12 Jul 2023 14:15:38 +0200
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Subject: [PATCH 1/2] client: define a "dummy" hostname to use for local
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connections
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For local communications (npipe://, unix://), the hostname is not used,
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but we need valid and meaningful hostname.
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The current code used the client's `addr` as hostname in some cases, which
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could contain the path for the unix-socket (`/var/run/docker.sock`), which
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gets rejected by go1.20.6 and go1.19.11 because of a security fix for
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[CVE-2023-29406 ][1], which was implemented in https://go.dev/issue/60374.
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Prior versions go Go would clean the host header, and strip slashes in the
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process, but go1.20.6 and go1.19.11 no longer do, and reject the host
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header.
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This patch introduces a `DummyHost` const, and uses this dummy host for
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cases where we don't need an actual hostname.
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Before this patch (using go1.20.6):
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make GO_VERSION=1.20.6 TEST_FILTER=TestAttach test-integration
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=== RUN TestAttachWithTTY
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attach_test.go:46: assertion failed: error is not nil: http: invalid Host header
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--- FAIL: TestAttachWithTTY (0.11s)
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=== RUN TestAttachWithoutTTy
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attach_test.go:46: assertion failed: error is not nil: http: invalid Host header
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--- FAIL: TestAttachWithoutTTy (0.02s)
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FAIL
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With this patch applied:
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make GO_VERSION=1.20.6 TEST_FILTER=TestAttach test-integration
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INFO: Testing against a local daemon
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=== RUN TestAttachWithTTY
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--- PASS: TestAttachWithTTY (0.12s)
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=== RUN TestAttachWithoutTTy
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--- PASS: TestAttachWithoutTTy (0.02s)
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PASS
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[1]: https://github.com/advisories/GHSA-f8f7-69v5-w4vx
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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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(cherry picked from commit 92975f0c11f0566cc3c36659f5e3bb9faf5cb176)
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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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---
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client/client.go | 30 ++++++++++++++++++++++++++++++
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client/hijack.go | 6 +++++-
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client/request.go | 14 ++++++--------
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client/request_test.go | 4 ++--
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4 files changed, 43 insertions(+), 11 deletions(-)
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diff --git a/client/client.go b/client/client.go
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index 0d3614d5..d0ce09ae 100644
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--- a/client/client.go
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+++ b/client/client.go
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@@ -56,6 +56,36 @@ import (
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"github.com/pkg/errors"
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)
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+// DummyHost is a hostname used for local communication.
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+//
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+// It acts as a valid formatted hostname for local connections (such as "unix://"
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+// or "npipe://") which do not require a hostname. It should never be resolved,
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+// but uses the special-purpose ".localhost" TLD (as defined in [RFC 2606, Section 2]
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+// and [RFC 6761, Section 6.3]).
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+//
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+// [RFC 7230, Section 5.4] defines that an empty header must be used for such
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+// cases:
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+//
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+// If the authority component is missing or undefined for the target URI,
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+// then a client MUST send a Host header field with an empty field-value.
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+//
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+// However, [Go stdlib] enforces the semantics of HTTP(S) over TCP, does not
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+// allow an empty header to be used, and requires req.URL.Scheme to be either
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+// "http" or "https".
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+//
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+// For further details, refer to:
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+//
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+// - https://github.com/docker/engine-api/issues/189
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+// - https://github.com/golang/go/issues/13624
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+// - https://github.com/golang/go/issues/61076
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+// - https://github.com/moby/moby/issues/45935
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+//
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+// [RFC 2606, Section 2]: https://www.rfc-editor.org/rfc/rfc2606.html#section-2
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+// [RFC 6761, Section 6.3]: https://www.rfc-editor.org/rfc/rfc6761#section-6.3
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+// [RFC 7230, Section 5.4]: https://datatracker.ietf.org/doc/html/rfc7230#section-5.4
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+// [Go stdlib]: https://github.com/golang/go/blob/6244b1946bc2101b01955468f1be502dbadd6807/src/net/http/transport.go#L558-L569
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+const DummyHost = "api.moby.localhost"
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+
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// ErrRedirect is the error returned by checkRedirect when the request is non-GET.
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var ErrRedirect = errors.New("unexpected redirect in response")
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diff --git a/client/hijack.go b/client/hijack.go
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index e1dc49ef..b8fac0be 100644
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--- a/client/hijack.go
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+++ b/client/hijack.go
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@@ -62,7 +62,11 @@ func fallbackDial(proto, addr string, tlsConfig *tls.Config) (net.Conn, error) {
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}
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func (cli *Client) setupHijackConn(ctx context.Context, req *http.Request, proto string) (net.Conn, error) {
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- req.Host = cli.addr
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+ req.URL.Host = cli.addr
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+ if cli.proto == "unix" || cli.proto == "npipe" {
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+ // Override host header for non-tcp connections.
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+ req.Host = DummyHost
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+ }
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req.Header.Set("Connection", "Upgrade")
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req.Header.Set("Upgrade", proto)
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diff --git a/client/request.go b/client/request.go
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index d3d9a3fe..66530d4b 100644
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--- a/client/request.go
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+++ b/client/request.go
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@@ -88,15 +88,13 @@ func (cli *Client) buildRequest(method, path string, body io.Reader, headers hea
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return nil, err
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}
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req = cli.addHeaders(req, headers)
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-
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- if cli.proto == "unix" || cli.proto == "npipe" {
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- // For local communications, it doesn't matter what the host is. We just
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- // need a valid and meaningful host name. (See #189)
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- req.Host = "docker"
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- }
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-
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- req.URL.Host = cli.addr
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req.URL.Scheme = cli.scheme
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+ req.URL.Host = cli.addr
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+
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+ if cli.proto == "unix" || cli.proto == "npipe" {
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+ // Override host header for non-tcp connections.
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+ req.Host = DummyHost
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+ }
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if expectedPayload && req.Header.Get("Content-Type") == "" {
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req.Header.Set("Content-Type", "text/plain")
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diff --git a/client/request_test.go b/client/request_test.go
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index a3be507b..c1a10923 100644
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--- a/client/request_test.go
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+++ b/client/request_test.go
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@@ -27,12 +27,12 @@ func TestSetHostHeader(t *testing.T) {
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}{
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{
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"unix:///var/run/docker.sock",
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- "docker",
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+ DummyHost,
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"/var/run/docker.sock",
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},
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{
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"npipe:////./pipe/docker_engine",
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- "docker",
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+ DummyHost,
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"//./pipe/docker_engine",
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},
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{
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--
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2.34.1
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@ -0,0 +1,72 @@
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From 1603196c5bc3e3b826c841e599bc45fc33562633 Mon Sep 17 00:00:00 2001
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Message-Id: <1603196c5bc3e3b826c841e599bc45fc33562633.1689689028.git.dpark@linux.microsoft.com>
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In-Reply-To: <74b4974cb7e7e81e57661f93b03c94a95a15472e.1689689028.git.dpark@linux.microsoft.com>
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References: <74b4974cb7e7e81e57661f93b03c94a95a15472e.1689689028.git.dpark@linux.microsoft.com>
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From: Sebastiaan van Stijn <github@gone.nl>
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Date: Wed, 12 Jul 2023 15:07:59 +0200
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Subject: [PATCH 2/2] pkg/plugins: use a dummy hostname for local connections
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For local communications (npipe://, unix://), the hostname is not used,
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but we need valid and meaningful hostname.
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The current code used the socket path as hostname, which gets rejected by
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go1.20.6 and go1.19.11 because of a security fix for [CVE-2023-29406 ][1],
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which was implemented in https://go.dev/issue/60374.
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Prior versions go Go would clean the host header, and strip slashes in the
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process, but go1.20.6 and go1.19.11 no longer do, and reject the host
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header.
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Before this patch, tests would fail on go1.20.6:
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=== FAIL: pkg/authorization TestAuthZRequestPlugin (15.01s)
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time="2023-07-12T12:53:45Z" level=warning msg="Unable to connect to plugin: //tmp/authz2422457390/authz-test-plugin.sock/AuthZPlugin.AuthZReq: Post \"http://%2F%2Ftmp%2Fauthz2422457390%2Fauthz-test-plugin.sock/AuthZPlugin.AuthZReq\": http: invalid Host header, retrying in 1s"
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time="2023-07-12T12:53:46Z" level=warning msg="Unable to connect to plugin: //tmp/authz2422457390/authz-test-plugin.sock/AuthZPlugin.AuthZReq: Post \"http://%2F%2Ftmp%2Fauthz2422457390%2Fauthz-test-plugin.sock/AuthZPlugin.AuthZReq\": http: invalid Host header, retrying in 2s"
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time="2023-07-12T12:53:48Z" level=warning msg="Unable to connect to plugin: //tmp/authz2422457390/authz-test-plugin.sock/AuthZPlugin.AuthZReq: Post \"http://%2F%2Ftmp%2Fauthz2422457390%2Fauthz-test-plugin.sock/AuthZPlugin.AuthZReq\": http: invalid Host header, retrying in 4s"
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time="2023-07-12T12:53:52Z" level=warning msg="Unable to connect to plugin: //tmp/authz2422457390/authz-test-plugin.sock/AuthZPlugin.AuthZReq: Post \"http://%2F%2Ftmp%2Fauthz2422457390%2Fauthz-test-plugin.sock/AuthZPlugin.AuthZReq\": http: invalid Host header, retrying in 8s"
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authz_unix_test.go:82: Failed to authorize request Post "http://%2F%2Ftmp%2Fauthz2422457390%2Fauthz-test-plugin.sock/AuthZPlugin.AuthZReq": http: invalid Host header
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[1]: https://github.com/advisories/GHSA-f8f7-69v5-w4vx
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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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(cherry picked from commit 6b7705d5b29e226a24902a8dcc488836faaee33c)
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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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---
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pkg/plugins/client.go | 14 ++++++++++++--
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1 file changed, 12 insertions(+), 2 deletions(-)
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diff --git a/pkg/plugins/client.go b/pkg/plugins/client.go
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index 752fecd0..e683eb77 100644
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--- a/pkg/plugins/client.go
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+++ b/pkg/plugins/client.go
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@@ -18,6 +18,12 @@ import (
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const (
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defaultTimeOut = 30
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+
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+ // dummyHost is a hostname used for local communication.
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+ //
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+ // For local communications (npipe://, unix://), the hostname is not used,
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+ // but we need valid and meaningful hostname.
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+ dummyHost = "plugin.moby.localhost"
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)
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func newTransport(addr string, tlsConfig *tlsconfig.Options) (transport.Transport, error) {
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@@ -44,8 +50,12 @@ func newTransport(addr string, tlsConfig *tlsconfig.Options) (transport.Transpor
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return nil, err
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}
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scheme := httpScheme(u)
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-
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- return transport.NewHTTPTransport(tr, scheme, socket), nil
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+ hostName := u.Host
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+ if hostName == "" || u.Scheme == "unix" || u.Scheme == "npipe" {
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+ // Override host header for non-tcp connections.
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+ hostName = dummyHost
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+ }
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+ return transport.NewHTTPTransport(tr, scheme, hostName), nil
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}
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// NewClient creates a new plugin client (http).
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--
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2.34.1
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