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Nayana BidariandgVisor bot
51723ede44
- This change enables sockets to set and get the `SO_MARK` option, which marks outgoing packets. - It also implements Netfilter (iptables) support for matching packet marks using the `mark` match extension. - Added unit and E2E tests to verify mark match and capabilities. PiperOrigin-RevId: 938123591
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Subset of socket tests that need Linux-specific headers (compared to POSIX
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// headers).
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#include <cerrno>
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#include "gtest/gtest.h"
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#include "test/util/capability_util.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/linux_capability_util.h"
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#include "test/util/socket_util.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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TEST(SocketTest, UnixConnectNeedsWritePerm) {
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FileDescriptor bound =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, PF_UNIX));
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struct sockaddr_un addr =
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ASSERT_NO_ERRNO_AND_VALUE(UniqueUnixAddr(/*abstract=*/false, AF_UNIX));
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ASSERT_THAT(bind(bound.get(), reinterpret_cast<struct sockaddr*>(&addr),
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sizeof(addr)),
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SyscallSucceeds());
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ASSERT_THAT(listen(bound.get(), 1), SyscallSucceeds());
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// Drop capabilities that allow us to override permission checks. Otherwise if
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// the test is run as root, the connect below will bypass permission checks
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// and succeed unexpectedly.
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AutoCapability cap(CAP_DAC_OVERRIDE, false);
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// Connect should fail without write perms.
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ASSERT_THAT(chmod(addr.sun_path, 0500), SyscallSucceeds());
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FileDescriptor client =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, PF_UNIX));
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ASSERT_THAT(connect(client.get(), reinterpret_cast<struct sockaddr*>(&addr),
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sizeof(addr)),
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SyscallFailsWithErrno(EACCES));
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// Connect should succeed with write perms.
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ASSERT_THAT(chmod(addr.sun_path, 0200), SyscallSucceeds());
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EXPECT_THAT(connect(client.get(), reinterpret_cast<struct sockaddr*>(&addr),
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sizeof(addr)),
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SyscallSucceeds());
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}
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TEST(SocketTest, SetMarkNeedsNetAdminOrRaw) {
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SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)) &&
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!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_RAW)));
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FileDescriptor bound =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_STREAM, 0));
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int mark = 1234;
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EXPECT_THAT(setsockopt(bound.get(), SOL_SOCKET, SO_MARK, &mark, sizeof(mark)),
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SyscallSucceeds());
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AutoCapability cap_admin(CAP_NET_ADMIN, false);
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AutoCapability cap_raw(CAP_NET_RAW, false);
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EXPECT_THAT(setsockopt(bound.get(), SOL_SOCKET, SO_MARK, &mark, sizeof(mark)),
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SyscallFailsWithErrno(EPERM));
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int get_mark = 0;
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socklen_t optlen = sizeof(get_mark);
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EXPECT_THAT(getsockopt(bound.get(), SOL_SOCKET, SO_MARK, &get_mark, &optlen),
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SyscallSucceeds());
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EXPECT_EQ(get_mark, mark);
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}
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} // namespace testing
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} // namespace gvisor
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