From nobody Fri Nov 29 20:55:57 2024 Received: from mx1.buffet.re (mx1.buffet.re [51.83.41.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDDD9157A59; Mon, 16 Sep 2024 12:24:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=51.83.41.69 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726489490; cv=none; b=Knj4OgUdPzdRYmjRMbzwe4yImDuc/kh6VvfB96G7L0taFKo1tk6vl064jBKl5P51kcZkS1BdunaRJYpOYvbEA8c+WmD3Zvax9r/mBsK+8f/h/OfMj+QFaSXR4yBsgJYmMFawaiAvyElpJ1HNzv0JWAfqmoQEXJo1aUJF+2QJ9DQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726489490; c=relaxed/simple; bh=/nlkhYDvi+9HmkfXRBtJwlHe7UqktCDrqO0xluC8jmE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ncFKY8J/zxiZbxJdjY/bCcSPwLDNte60pBbYXFRUJNVeiDeFsSmJ/NQ97umLkqdii1vSRmfpQBf0BXwwPqiJ3hC3C4KifzIPHBAVOS+YdCfYskWy0NWW/bIqyEFBZW/MOsitdDlgM5SkKhuWQqGTmRkvof3VFq1JzOUahNLb6Jo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=buffet.re; spf=pass smtp.mailfrom=buffet.re; dkim=pass (2048-bit key) header.d=buffet.re header.i=@buffet.re header.b=NaABqBJz; arc=none smtp.client-ip=51.83.41.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=buffet.re Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=buffet.re Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=buffet.re header.i=@buffet.re header.b="NaABqBJz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=buffet.re; s=mx1; t=1726489482; bh=/nlkhYDvi+9HmkfXRBtJwlHe7UqktCDrqO0xluC8jmE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NaABqBJz2w4jm41sthqemUp58qwbkCYa8yT5nN2RPmNaj3CIkgEyHyPh97oKPLVII jaSpc3BEx9p6M2MBkVepC/ZEeyYchba5jjq/YkDWzLNo0pt5QUT4vbb+bvU1cIyy8Q +Iwrq3DX8VyBo8MIivyC9T07fffdb0JR16vMxDA2zOiinAY9PcyNvdU3xpFEThQjR0 0wB/LGA+/vbD+0MCRnOzjfcQyQYqxL6UNERwWYWWsJGbDYvvWXuKUqI/+eqmMnb4Cx QFiYcYH1HTV4VQ5FRsq+nukz8B5bmaoW02hTIEBBGIURlfBASln6+3ha1KA/0ZLcXK BjsM337mXu0pQ== Received: from localhost.localdomain (unknown [10.0.1.3]) by mx1.buffet.re (Postfix) with ESMTPA id CE5F21230C2; Mon, 16 Sep 2024 14:24:41 +0200 (CEST) From: Matthieu Buffet To: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= Cc: =?UTF-8?q?G=C3=BCnther=20Noack?= , Paul Moore , James Morris , "Serge E . Hallyn" , linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Matthieu Buffet Subject: [RFC PATCH v1 7/7] selftests/landlock: Add UDP sendmsg/recvmsg tests Date: Mon, 16 Sep 2024 14:22:30 +0200 Message-Id: <20240916122230.114800-8-matthieu@buffet.re> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240916122230.114800-1-matthieu@buffet.re> References: <20240916122230.114800-1-matthieu@buffet.re> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add tests specific to send/recv, orthogonal to whether the process is allowed to bind/connect. Signed-off-by: Matthieu Buffet --- tools/testing/selftests/landlock/net_test.c | 373 ++++++++++++++++++++ 1 file changed, 373 insertions(+) diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/se= lftests/landlock/net_test.c index 883e6648e79a..a02307ba069c 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -285,6 +285,29 @@ static int connect_variant(const int sock_fd, return connect_variant_addrlen(sock_fd, srv, get_addrlen(srv, false)); } =20 +static int get_msg_addr_variant(struct msghdr *msg, + const struct service_fixture *const srv) +{ + switch (srv->protocol.domain) { + case AF_UNSPEC: + case AF_INET: + msg->msg_name =3D (void *)&srv->ipv4_addr; + break; + case AF_INET6: + msg->msg_name =3D (void *)&srv->ipv6_addr; + break; + case AF_UNIX: + msg->msg_name =3D (void *)&srv->unix_addr; + break; + default: + errno =3D -EAFNOSUPPORT; + return -errno; + } + + msg->msg_namelen =3D get_addrlen(srv, false); + return 0; +} + FIXTURE(protocol) { struct service_fixture srv0, srv1, srv2, unspec_any0, unspec_srv0; @@ -927,6 +950,356 @@ TEST_F(protocol, connect_unspec) EXPECT_EQ(0, close(bind_fd)); } =20 +FIXTURE(udp_send_recv) +{ + struct service_fixture srv_allowed; + struct service_fixture srv_denied; + struct service_fixture srv_ephemeral; + struct service_fixture addr_unspec0, addr_unspec1; + int srv_allowed_fd, srv_denied_fd, srv_ephemeral_fd, client_fd; + char read_buf[1]; + struct iovec testmsg_contents; + struct msghdr testmsg; +}; + +FIXTURE_VARIANT(udp_send_recv) +{ + const struct protocol_variant prot; +}; + +FIXTURE_SETUP(udp_send_recv) +{ + const struct timeval read_timeout =3D { + .tv_sec =3D 0, + .tv_usec =3D 100000, + }; + const struct protocol_variant prot_unspec =3D { + .domain =3D AF_UNSPEC, + .type =3D SOCK_STREAM, + }; + + disable_caps(_metadata); + + ASSERT_EQ(0, set_service(&self->addr_unspec0, prot_unspec, 0)); + ASSERT_EQ(0, set_service(&self->addr_unspec1, prot_unspec, 1)); + + /* Prepare one server socket to be denied */ + ASSERT_EQ(0, set_service(&self->srv_denied, variant->prot, 0)); + self->srv_denied_fd =3D socket_variant(&self->srv_denied); + ASSERT_LE(0, self->srv_denied_fd); + ASSERT_EQ(0, bind_variant(self->srv_denied_fd, &self->srv_denied)); + + /* Prepare one server socket on specific port to be allowed */ + ASSERT_EQ(0, set_service(&self->srv_allowed, variant->prot, 1)); + self->srv_allowed_fd =3D socket_variant(&self->srv_allowed); + ASSERT_LE(0, self->srv_allowed_fd); + ASSERT_EQ(0, bind_variant(self->srv_allowed_fd, &self->srv_allowed)); + + /* Prepare one server socket on ephemeral port to be allowed */ + ASSERT_EQ(0, set_service(&self->srv_ephemeral, variant->prot, 0)); + if (variant->prot.domain =3D=3D AF_INET) + self->srv_ephemeral.ipv4_addr.sin_port =3D 0; + else if (variant->prot.domain =3D=3D AF_INET6) + self->srv_ephemeral.ipv6_addr.sin6_port =3D 0; + self->srv_ephemeral_fd =3D socket_variant(&self->srv_ephemeral); + ASSERT_LE(0, self->srv_ephemeral_fd); + ASSERT_EQ(0, bind_variant(self->srv_ephemeral_fd, + &self->srv_ephemeral)); + self->srv_ephemeral.port =3D get_binded_port(self->srv_ephemeral_fd, + &variant->prot); + ASSERT_NE(0, self->srv_ephemeral.port); + if (variant->prot.domain =3D=3D AF_INET) + self->srv_ephemeral.ipv4_addr.sin_port =3D htons(self->srv_ephemeral.por= t); + else if (variant->prot.domain =3D=3D AF_INET6) + self->srv_ephemeral.ipv6_addr.sin6_port =3D htons(self->srv_ephemeral.po= rt); + + /* We must absolutely avoid blocking other tests indefinitely */ + EXPECT_EQ(0, setsockopt(self->srv_allowed_fd, SOL_SOCKET, + SO_RCVTIMEO, + &read_timeout, sizeof(read_timeout))); + EXPECT_EQ(0, setsockopt(self->srv_denied_fd, SOL_SOCKET, + SO_RCVTIMEO, + &read_timeout, sizeof(read_timeout))); + EXPECT_EQ(0, setsockopt(self->srv_ephemeral_fd, SOL_SOCKET, + SO_RCVTIMEO, + &read_timeout, sizeof(read_timeout))); + + self->client_fd =3D socket_variant(&self->srv_denied); + ASSERT_LE(0, self->client_fd); + + self->read_buf[0] =3D 0; + + self->testmsg_contents.iov_len =3D 1; + memset(&self->testmsg, 0, sizeof(self->testmsg)); + self->testmsg.msg_iov =3D &self->testmsg_contents; + self->testmsg.msg_iovlen =3D 1; +} + +FIXTURE_TEARDOWN(udp_send_recv) +{ + EXPECT_EQ(0, close(self->srv_allowed_fd)); + EXPECT_EQ(0, close(self->srv_denied_fd)); + EXPECT_EQ(0, close(self->client_fd)); +} + +/* clang-format off */ +FIXTURE_VARIANT_ADD(udp_send_recv, ipv4) { + .prot =3D { + .domain =3D AF_INET, + .type =3D SOCK_DGRAM, + }, +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(udp_send_recv, ipv6) { + .prot =3D { + .domain =3D AF_INET6, + .type =3D SOCK_DGRAM, + }, +}; + +TEST_F(udp_send_recv, sendmsg) +{ + const struct landlock_ruleset_attr ruleset_attr =3D { + .handled_access_net =3D LANDLOCK_ACCESS_NET_SENDMSG_UDP, + }; + const struct landlock_net_port_attr allow_one_server =3D { + .allowed_access =3D LANDLOCK_ACCESS_NET_SENDMSG_UDP, + .port =3D self->srv_allowed.port, + }; + const int ruleset_fd =3D landlock_create_ruleset( + &ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, + LANDLOCK_RULE_NET_PORT, + &allow_one_server, 0)); + + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + + /* Send without bind nor explicit address */ + EXPECT_EQ(-1, write(self->client_fd, "A", 1)); + EXPECT_EQ(EDESTADDRREQ, errno); + + /* Send with an explicit denied address */ + self->testmsg_contents.iov_base =3D "B"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_denied)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(-1, read(self->srv_denied_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(EAGAIN, errno); + + /* Send with an explicit allowed address */ + self->testmsg_contents.iov_base =3D "C"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_allowed)); + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)) + { + TH_LOG("sendmsg failed: %s", strerror(errno)); + } + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(self->read_buf[0], 'C'); + + /* + * Sending to (AF_UNSPEC, port) should be equivalent to not specifying + * a destination in IPv6, and equivalent to (AF_INET, port) in IPv4. + */ + if (variant->prot.domain =3D=3D AF_INET) { + self->testmsg_contents.iov_base =3D "D"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->addr_unspec0)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EACCES, errno); + + self->testmsg_contents.iov_base =3D "E"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->addr_unspec1)); + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, + sizeof(self->read_buf))); + EXPECT_EQ(self->read_buf[0], 'E'); + } else if (variant->prot.domain =3D=3D AF_INET6) { + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->addr_unspec0)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EDESTADDRREQ, errno); + } + + /* Send without an address, after connect()ing to an allowed address */ + self->testmsg.msg_name =3D NULL; + self->testmsg.msg_namelen =3D 0; + self->testmsg_contents.iov_base =3D "F"; + ASSERT_EQ(0, connect_variant(self->client_fd, &self->srv_allowed)); + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)) + { + TH_LOG("sendmsg failed: %s", strerror(errno)); + } + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, + sizeof(self->read_buf))); + EXPECT_EQ(self->read_buf[0], 'F'); + + /* + * Sending to AF_UNSPEC should be equivalent to not specifying an + * address (in IPv6 only) and falling back to the allowed address. + */ + if (variant->prot.domain =3D=3D AF_INET6) { + self->testmsg_contents.iov_base =3D "G"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->addr_unspec0)); + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)) { + TH_LOG("sendmsg failed: %s", strerror(errno)); + } + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, + sizeof(self->read_buf))); + EXPECT_EQ(self->read_buf[0], 'G'); + } + + /* Send without an address, after connect()ing to a denied address */ + self->testmsg_contents.iov_base =3D "H"; + ASSERT_EQ(0, connect_variant(self->client_fd, &self->srv_denied)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(-1, read(self->srv_denied_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(EAGAIN, errno); + + /* + * Sending to AF_UNSPEC should be equivalent to not specifying an + * address (in IPv6 only) and falling back to the denied address. + */ + if (variant->prot.domain =3D=3D AF_INET6) { + self->testmsg_contents.iov_base =3D "I"; + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->addr_unspec0)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EACCES, errno); + } + + /* Send with an explicit allowed address, should overrule connect() */ + self->testmsg_contents.iov_base =3D "J"; + ASSERT_EQ(0, connect_variant(self->client_fd, &self->srv_denied)); + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_allowed)); + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)) + { + TH_LOG("sendmsg failed: %s", strerror(errno)); + } + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(self->read_buf[0], 'J'); + + /* Send with an explicit denied address, should overrule connect() */ + self->testmsg_contents.iov_base =3D "K"; + ASSERT_EQ(0, connect_variant(self->client_fd, &self->srv_allowed)); + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_denied)); + EXPECT_EQ(-1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(-1, read(self->srv_allowed_fd, + self->read_buf, sizeof(self->read_buf))); + EXPECT_EQ(EAGAIN, errno); + EXPECT_EQ(-1, read(self->srv_denied_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(EAGAIN, errno); +} + +TEST_F(udp_send_recv, recvmsg_on_fixed_port) +{ + struct sockaddr_storage from =3D {0}; + socklen_t from_len =3D sizeof(from); + const struct landlock_ruleset_attr ruleset_attr =3D { + .handled_access_net =3D LANDLOCK_ACCESS_NET_RECVMSG_UDP, + }; + const struct landlock_net_port_attr allow_one_server =3D { + .allowed_access =3D LANDLOCK_ACCESS_NET_RECVMSG_UDP, + .port =3D self->srv_allowed.port, + }; + const int ruleset_fd =3D landlock_create_ruleset( + &ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, + LANDLOCK_RULE_NET_PORT, + &allow_one_server, 0)); + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + + /* Receive on an allowed port with read() */ + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_allowed)); + self->testmsg_contents.iov_base =3D "A"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(1, read(self->srv_allowed_fd, self->read_buf, + sizeof(self->read_buf))) { + TH_LOG("read failed: %s", strerror(errno)); + } + EXPECT_EQ(self->read_buf[0], 'A'); + + /* Receive on an allowed port with recv() */ + self->testmsg_contents.iov_base =3D "B"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(1, recv(self->srv_allowed_fd, + self->read_buf, sizeof(self->read_buf), 0)) { + TH_LOG("recv failed: %s", strerror(errno)); + } + EXPECT_EQ(self->read_buf[0], 'B'); + + /* Receive on an allowed port with recvfrom() */ + self->testmsg_contents.iov_base =3D "C"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(1, recvfrom(self->srv_allowed_fd, + self->read_buf, sizeof(self->read_buf), 0, + (struct sockaddr *)&from, &from_len)) { + TH_LOG("recv failed: %s", strerror(errno)); + } + EXPECT_EQ(self->read_buf[0], 'C'); + + /* Receive on a denied port with read() */ + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, &self->srv_allowed)); + self->testmsg_contents.iov_base =3D "D"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(-1, read(self->srv_denied_fd, self->read_buf, sizeof(self->read= _buf))); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(self->read_buf[0], 'C'); + + /* Receive on an denied port with recv() */ + self->testmsg_contents.iov_base =3D "B"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(-1, recv(self->srv_denied_fd, self->read_buf, + sizeof(self->read_buf), 0)); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(self->read_buf[0], 'C'); + + /* Receive on an denied port with recvfrom() */ + self->testmsg_contents.iov_base =3D "C"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(-1, recvfrom(self->srv_denied_fd, self->read_buf, + sizeof(self->read_buf), 0, + (struct sockaddr *)&from, &from_len)); + EXPECT_EQ(EACCES, errno); + EXPECT_EQ(self->read_buf[0], 'C'); +} + +TEST_F(udp_send_recv, recvmsg_on_ephemeral_port) +{ + const struct landlock_ruleset_attr ruleset_attr =3D { + .handled_access_net =3D LANDLOCK_ACCESS_NET_RECVMSG_UDP, + }; + const struct landlock_net_port_attr allow_one_server =3D { + .allowed_access =3D LANDLOCK_ACCESS_NET_RECVMSG_UDP, + .port =3D 0, + }; + const int ruleset_fd =3D landlock_create_ruleset( + &ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, + LANDLOCK_RULE_NET_PORT, + &allow_one_server, 0)); + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + + EXPECT_EQ(0, get_msg_addr_variant(&self->testmsg, + &self->srv_ephemeral)); + + self->testmsg_contents.iov_base =3D "A"; + EXPECT_EQ(1, sendmsg(self->client_fd, &self->testmsg, 0)); + EXPECT_EQ(1, read(self->srv_ephemeral_fd, self->read_buf, + sizeof(self->read_buf))) { + TH_LOG("read failed: %s", strerror(errno)); + } + EXPECT_EQ(self->read_buf[0], 'A'); +} + FIXTURE(ipv4) { struct service_fixture srv0, srv1; --=20 2.39.5