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AJvYcCVasPa24fFqLJW7lxF1kRY/2jbMFj5pMXWwry+9e1zbK8ntU3TaNgDChExDtUuqeYL35VmxqwlV@vger.kernel.org, AJvYcCWIUJHZpENVA3+NdTTgfYLpl/bp/H3OqUcrOV2TMGk+jJVs7s3hPVlsbG62bhVfGxxWZvtBHutsIUfuSuo=@vger.kernel.org, AJvYcCXyRc6uM2zmrOgip3uAX7SFzQSIfUvPRMRebbbnGiChh+yB9GQIE3hFiOGH8H29LeDAuhhuziVTjLsYrUa632uwpj9esT3G@vger.kernel.org X-Gm-Message-State: AOJu0Yw+idqkBkJisRrlX/QE8GL7gZTxosiJue7/ajTP35NozXg5lW2B OQ6lAvJcP96LbbfjYx2NZGVsGiCCm3qDE9hYc9B6qq1upWGOPspB X-Google-Smtp-Source: AGHT+IGRPHDFPaOyrRiWUwZOdFRWwBx7Zh9NjqmLP05p400wI5Lohx/pu+ufexDnKiFQGtV4iDhQQQ== X-Received: by 2002:a05:6871:4910:b0:277:d17b:50b4 with SMTP id 586e51a60fabf-277d17be466mr11597577fac.5.1725495264414; Wed, 04 Sep 2024 17:14:24 -0700 (PDT) Received: from tahera-OptiPlex-5000.tail3bf47f.ts.net ([136.159.49.123]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71778534921sm2159781b3a.76.2024.09.04.17.14.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2024 17:14:23 -0700 (PDT) From: Tahera Fahimi To: outreachy@lists.linux.dev Cc: mic@digikod.net, gnoack@google.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn3_gh@protonmail.com, jannh@google.com, netdev@vger.kernel.org, Tahera Fahimi Subject: [PATCH v11 3/8] selftests/landlock: Add abstract UNIX socket restriction tests Date: Wed, 4 Sep 2024 18:13:57 -0600 Message-Id: <9321c3d3bcd9212ceb4b50693e29349f8d625e16.1725494372.git.fahimitahera@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The patch introduces Landlock ABI version 6 and adds three tests that examines different scenarios for abstract UNIX socket: 1) unix_socket: base tests of the abstract socket scoping mechanism for a landlocked process, same as the ptrace test. 2) scoped_vs_unscoped_sockets: generates three processes with different domains and tests if a process with a non-scoped domain can connect to other processes. 3) outside_socket: since the socket's creator credentials are used for scoping sockets, this test examines the cases where the socket's credentials are different from the process using it. Signed-off-by: Tahera Fahimi --- Changes in versions: v11: - Adding a generalized domain creation function, "create_scoped_domain", for different types of scoped domains in "scoped_common.h" file. - Rename "unix_socket" to "scoped_domain" and moving its variants to "scoped_base_variants.h" file (for future use in other IPC tests). - Minor code improvement, and renaming variables. - Rename "optional_scoping" to "scoped_vs_unscoped_sockets", and add support for datagram and stream sockets. Moving its variants to "scoped_multiple_domain_variants.h" file. v10: - Code improvements by changing fixture variables to local ones. - Rename "unix_sock_special_cases" to "outside_socket" v9: - Move pathname_address_sockets to a different patch. - Extend optional_scoping test scenarios. - Removing hardcoded numbers and using "backlog" instead. V8: - Move tests to scoped_abstract_unix_test.c file. - To avoid potential conflicts among Unix socket names in different tests, set_unix_address is added to common.h to set different sun_path for Unix sockets. - protocol_variant and service_fixture structures are also moved to common.h - Adding pathname_address_sockets to cover all types of address formats for unix sockets, and moving remove_path() to common.h to reuse in this test. V7: - Introducing landlock ABI version 6. - Adding some edge test cases to optional_scoping test. - Using `enum` for different domains in optional_scoping tests. - Extend unix_sock_special_cases test cases for connected(SOCK_STREAM) sockets. - Modifying inline comments. V6: - Introducing optional_scoping test which ensures a sandboxed process with a non-scoped domain can still connect to another abstract unix socket(either sandboxed or non-sandboxed). - Introducing unix_sock_special_cases test which tests examines scenarios where the connecting sockets have different domain than the process using them. V4: - Introducing unix_socket to evaluate the basic scoping mechanism for abstract unix sockets. --- tools/testing/selftests/landlock/common.h | 38 ++ tools/testing/selftests/landlock/net_test.c | 31 +- .../landlock/scoped_abstract_unix_test.c | 620 ++++++++++++++++++ .../selftests/landlock/scoped_base_variants.h | 154 +++++ .../selftests/landlock/scoped_common.h | 28 + .../scoped_multiple_domain_variants.h | 154 +++++ 6 files changed, 995 insertions(+), 30 deletions(-) create mode 100644 tools/testing/selftests/landlock/scoped_abstract_unix_test.c create mode 100644 tools/testing/selftests/landlock/scoped_base_variants.h create mode 100644 tools/testing/selftests/landlock/scoped_common.h create mode 100644 tools/testing/selftests/landlock/scoped_multiple_domain_variants.h diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h index 7e2b431b9f90..cca387df86c2 100644 --- a/tools/testing/selftests/landlock/common.h +++ b/tools/testing/selftests/landlock/common.h @@ -7,6 +7,7 @@ * Copyright © 2021 Microsoft Corporation */ +#include #include #include #include @@ -14,10 +15,12 @@ #include #include #include +#include #include #include #include "../kselftest_harness.h" +#define TMP_DIR "tmp" #ifndef __maybe_unused #define __maybe_unused __attribute__((__unused__)) @@ -226,3 +229,38 @@ enforce_ruleset(struct __test_metadata *const _metadata, const int ruleset_fd) TH_LOG("Failed to enforce ruleset: %s", strerror(errno)); } } + +struct protocol_variant { + int domain; + int type; +}; + +struct service_fixture { + struct protocol_variant protocol; + /* port is also stored in ipv4_addr.sin_port or ipv6_addr.sin6_port */ + unsigned short port; + union { + struct sockaddr_in ipv4_addr; + struct sockaddr_in6 ipv6_addr; + struct { + struct sockaddr_un unix_addr; + socklen_t unix_addr_len; + }; + }; +}; + +static pid_t __maybe_unused sys_gettid(void) +{ + return syscall(__NR_gettid); +} + +static void __maybe_unused set_unix_address(struct service_fixture *const srv, + const unsigned short index) +{ + srv->unix_addr.sun_family = AF_UNIX; + sprintf(srv->unix_addr.sun_path, + "_selftests-landlock-abstract-unix-tid%d-index%d", sys_gettid(), + index); + srv->unix_addr_len = SUN_LEN(&srv->unix_addr); + srv->unix_addr.sun_path[0] = '\0'; +} diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c index f21cfbbc3638..4e0aeb53b225 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -36,30 +36,6 @@ enum sandbox_type { TCP_SANDBOX, }; -struct protocol_variant { - int domain; - int type; -}; - -struct service_fixture { - struct protocol_variant protocol; - /* port is also stored in ipv4_addr.sin_port or ipv6_addr.sin6_port */ - unsigned short port; - union { - struct sockaddr_in ipv4_addr; - struct sockaddr_in6 ipv6_addr; - struct { - struct sockaddr_un unix_addr; - socklen_t unix_addr_len; - }; - }; -}; - -static pid_t sys_gettid(void) -{ - return syscall(__NR_gettid); -} - static int set_service(struct service_fixture *const srv, const struct protocol_variant prot, const unsigned short index) @@ -92,12 +68,7 @@ static int set_service(struct service_fixture *const srv, return 0; case AF_UNIX: - srv->unix_addr.sun_family = prot.domain; - sprintf(srv->unix_addr.sun_path, - "_selftests-landlock-net-tid%d-index%d", sys_gettid(), - index); - srv->unix_addr_len = SUN_LEN(&srv->unix_addr); - srv->unix_addr.sun_path[0] = '\0'; + set_unix_address(srv, index); return 0; } return 1; diff --git a/tools/testing/selftests/landlock/scoped_abstract_unix_test.c b/tools/testing/selftests/landlock/scoped_abstract_unix_test.c new file mode 100644 index 000000000000..00ea5151979f --- /dev/null +++ b/tools/testing/selftests/landlock/scoped_abstract_unix_test.c @@ -0,0 +1,620 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Landlock tests - Abstract Unix Socket + * + * Copyright © 2024 Tahera Fahimi + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "scoped_common.h" + +/* Number pending connections queue to be hold. */ +const short backlog = 10; + +static void create_fs_domain(struct __test_metadata *const _metadata) +{ + int ruleset_fd; + struct landlock_ruleset_attr ruleset_attr = { + .handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR, + }; + + ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + EXPECT_LE(0, ruleset_fd) + { + TH_LOG("Failed to create a ruleset: %s", strerror(errno)); + } + EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); + EXPECT_EQ(0, landlock_restrict_self(ruleset_fd, 0)); + EXPECT_EQ(0, close(ruleset_fd)); +} + +/* clang-format off */ +FIXTURE(scoped_domains) +{ + struct service_fixture stream_address, dgram_address; +}; + +#include "scoped_base_variants.h" + +/* clang-format on */ +FIXTURE_SETUP(scoped_domains) +{ + memset(&self->stream_address, 0, sizeof(self->stream_address)); + memset(&self->dgram_address, 0, sizeof(self->dgram_address)); + set_unix_address(&self->stream_address, 0); + set_unix_address(&self->dgram_address, 1); +} + +FIXTURE_TEARDOWN(scoped_domains) +{ +} + +/* + * Test unix_stream_connect() and unix_may_send() for a child connecting to its parent, + * when they have scoped domain or no domain. + */ +TEST_F(scoped_domains, connect_to_parent) +{ + pid_t child; + bool can_connect_to_parent; + int err, err_dgram, status; + int pipe_parent[2]; + int stream_socket, dgram_socket; + + drop_caps(_metadata); + /* + * can_connect_to_parent is true if a child process can connect to its + * parent process. This depends on the child process is not isolated from + * the parent with a dedicated Landlock domain. + */ + can_connect_to_parent = !variant->domain_child; + + ASSERT_EQ(0, pipe2(pipe_parent, O_CLOEXEC)); + if (variant->domain_both) { + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + if (!__test_passed(_metadata)) + return; + } + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + char buf_child; + + ASSERT_EQ(0, close(pipe_parent[1])); + if (variant->domain_child) + create_scoped_domain( + _metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + stream_socket = socket(AF_UNIX, SOCK_STREAM, 0); + dgram_socket = socket(AF_UNIX, SOCK_DGRAM, 0); + + ASSERT_NE(-1, stream_socket); + ASSERT_NE(-1, dgram_socket); + + /* wait for the server */ + ASSERT_EQ(1, read(pipe_parent[0], &buf_child, 1)); + + err = connect(stream_socket, &self->stream_address.unix_addr, + (self->stream_address).unix_addr_len); + err_dgram = connect(dgram_socket, + &self->dgram_address.unix_addr, + (self->dgram_address).unix_addr_len); + if (can_connect_to_parent) { + EXPECT_EQ(0, err); + EXPECT_EQ(0, err_dgram); + } else { + EXPECT_EQ(-1, err); + EXPECT_EQ(-1, err_dgram); + EXPECT_EQ(EPERM, errno); + } + ASSERT_EQ(0, close(stream_socket)); + ASSERT_EQ(0, close(dgram_socket)); + _exit(_metadata->exit_code); + return; + } + ASSERT_EQ(0, close(pipe_parent[0])); + if (variant->domain_parent) + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + stream_socket = socket(AF_UNIX, SOCK_STREAM, 0); + dgram_socket = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, stream_socket); + ASSERT_NE(-1, dgram_socket); + ASSERT_EQ(0, bind(stream_socket, &self->stream_address.unix_addr, + (self->stream_address).unix_addr_len)); + ASSERT_EQ(0, bind(dgram_socket, &self->dgram_address.unix_addr, + (self->dgram_address).unix_addr_len)); + ASSERT_EQ(0, listen(stream_socket, backlog)); + + /* signal to child that parent is listening */ + ASSERT_EQ(1, write(pipe_parent[1], ".", 1)); + + ASSERT_EQ(child, waitpid(child, &status, 0)); + ASSERT_EQ(0, close(stream_socket)); + ASSERT_EQ(0, close(dgram_socket)); + + if (WIFSIGNALED(status) || !WIFEXITED(status) || + WEXITSTATUS(status) != EXIT_SUCCESS) + _metadata->exit_code = KSFT_FAIL; +} + +/* + * Test unix_stream_connect() and unix_may_send() for a parent connecting to its child, + * when they have scoped domain or no domain. + */ +TEST_F(scoped_domains, connect_to_child) +{ + pid_t child; + bool can_connect_to_child; + int err, err_dgram, status; + int pipe_child[2], pipe_parent[2]; + char buf; + int stream_socket, dgram_socket; + + drop_caps(_metadata); + /* + * can_connect_to_child is true if a parent process can connect to its + * child process. The parent process is not isolated from the child + * with a dedicated Landlock domain. + */ + can_connect_to_child = !variant->domain_parent; + + ASSERT_EQ(0, pipe2(pipe_child, O_CLOEXEC)); + ASSERT_EQ(0, pipe2(pipe_parent, O_CLOEXEC)); + if (variant->domain_both) { + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + if (!__test_passed(_metadata)) + return; + } + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + ASSERT_EQ(0, close(pipe_parent[1])); + ASSERT_EQ(0, close(pipe_child[0])); + if (variant->domain_child) + create_scoped_domain( + _metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + /* Waits for the parent to be in a domain, if any. */ + ASSERT_EQ(1, read(pipe_parent[0], &buf, 1)); + + stream_socket = socket(AF_UNIX, SOCK_STREAM, 0); + dgram_socket = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, stream_socket); + ASSERT_NE(-1, dgram_socket); + ASSERT_EQ(0, + bind(stream_socket, &self->stream_address.unix_addr, + (self->stream_address).unix_addr_len)); + ASSERT_EQ(0, bind(dgram_socket, &self->dgram_address.unix_addr, + (self->dgram_address).unix_addr_len)); + ASSERT_EQ(0, listen(stream_socket, backlog)); + /* signal to parent that child is listening */ + ASSERT_EQ(1, write(pipe_child[1], ".", 1)); + /* wait to connect */ + ASSERT_EQ(1, read(pipe_parent[0], &buf, 1)); + ASSERT_EQ(0, close(stream_socket)); + ASSERT_EQ(0, close(dgram_socket)); + _exit(_metadata->exit_code); + return; + } + ASSERT_EQ(0, close(pipe_child[1])); + ASSERT_EQ(0, close(pipe_parent[0])); + + if (variant->domain_parent) + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + /* Signals that the parent is in a domain, if any. */ + ASSERT_EQ(1, write(pipe_parent[1], ".", 1)); + + stream_socket = socket(AF_UNIX, SOCK_STREAM, 0); + dgram_socket = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, stream_socket); + ASSERT_NE(-1, dgram_socket); + + /* Waits for the child to listen */ + ASSERT_EQ(1, read(pipe_child[0], &buf, 1)); + err = connect(stream_socket, &self->stream_address.unix_addr, + (self->stream_address).unix_addr_len); + err_dgram = connect(dgram_socket, &self->dgram_address.unix_addr, + (self->dgram_address).unix_addr_len); + if (can_connect_to_child) { + EXPECT_EQ(0, err); + EXPECT_EQ(0, err_dgram); + } else { + EXPECT_EQ(-1, err); + EXPECT_EQ(-1, err_dgram); + EXPECT_EQ(EPERM, errno); + } + ASSERT_EQ(1, write(pipe_parent[1], ".", 1)); + ASSERT_EQ(0, close(stream_socket)); + ASSERT_EQ(0, close(dgram_socket)); + + ASSERT_EQ(child, waitpid(child, &status, 0)); + if (WIFSIGNALED(status) || !WIFEXITED(status) || + WEXITSTATUS(status) != EXIT_SUCCESS) + _metadata->exit_code = KSFT_FAIL; +} + +/* clang-format off */ +FIXTURE(scoped_vs_unscoped_sockets) +{ + struct service_fixture parent_stream_address, parent_dgram_address, + child_stream_address, child_dgram_address; +}; + +#include "scoped_multiple_domain_variants.h" +/* clang-format on */ + +FIXTURE_SETUP(scoped_vs_unscoped_sockets) +{ + memset(&self->parent_stream_address, 0, + sizeof(self->parent_stream_address)); + set_unix_address(&self->parent_stream_address, 0); + memset(&self->parent_dgram_address, 0, + sizeof(self->parent_dgram_address)); + set_unix_address(&self->parent_dgram_address, 1); + memset(&self->child_stream_address, 0, + sizeof(self->child_stream_address)); + set_unix_address(&self->child_stream_address, 2); + memset(&self->child_dgram_address, 0, + sizeof(self->child_dgram_address)); + set_unix_address(&self->child_dgram_address, 3); +} + +FIXTURE_TEARDOWN(scoped_vs_unscoped_sockets) +{ +} + +/* + * Test unix_stream_connect and unix_may_send for parent, child and + * grand child processes when they can have scoped or non-scoped domains. + */ +TEST_F(scoped_vs_unscoped_sockets, unix_scoping) +{ + pid_t child; + int status; + bool can_connect_to_parent, can_connect_to_child; + int pipe_parent[2]; + int stream_server, dgram_server; + + drop_caps(_metadata); + can_connect_to_child = (variant->domain_grand_child != SCOPE_SANDBOX); + can_connect_to_parent = (can_connect_to_child && + (variant->domain_children != SCOPE_SANDBOX)); + + ASSERT_EQ(0, pipe2(pipe_parent, O_CLOEXEC)); + + if (variant->domain_all == OTHER_SANDBOX) + create_fs_domain(_metadata); + else if (variant->domain_all == SCOPE_SANDBOX) + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + int pipe_child[2]; + pid_t grand_child; + + ASSERT_EQ(0, pipe2(pipe_child, O_CLOEXEC)); + + if (variant->domain_children == OTHER_SANDBOX) + create_fs_domain(_metadata); + else if (variant->domain_children == SCOPE_SANDBOX) + create_scoped_domain( + _metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + grand_child = fork(); + ASSERT_LE(0, grand_child); + if (grand_child == 0) { + char buf; + int err, dgram_err; + int stream_client, dgram_client; + + ASSERT_EQ(0, close(pipe_parent[1])); + ASSERT_EQ(0, close(pipe_child[1])); + + if (variant->domain_grand_child == OTHER_SANDBOX) + create_fs_domain(_metadata); + else if (variant->domain_grand_child == SCOPE_SANDBOX) + create_scoped_domain( + _metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + stream_client = socket(AF_UNIX, SOCK_STREAM, 0); + ASSERT_NE(-1, stream_client); + dgram_client = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, dgram_client); + + ASSERT_EQ(1, read(pipe_child[0], &buf, 1)); + err = connect(stream_client, + &self->child_stream_address.unix_addr, + self->child_stream_address.unix_addr_len); + dgram_err = connect( + dgram_client, + &self->child_dgram_address.unix_addr, + self->child_dgram_address.unix_addr_len); + if (can_connect_to_child) { + EXPECT_EQ(0, err); + EXPECT_EQ(0, dgram_err); + } else { + EXPECT_EQ(-1, err); + EXPECT_EQ(-1, dgram_err); + EXPECT_EQ(EPERM, errno); + } + + EXPECT_EQ(0, close(stream_client)); + stream_client = socket(AF_UNIX, SOCK_STREAM, 0); + ASSERT_NE(-1, stream_client); + + ASSERT_EQ(1, read(pipe_parent[0], &buf, 1)); + err = connect( + stream_client, + &self->parent_stream_address.unix_addr, + self->parent_stream_address.unix_addr_len); + dgram_err = connect( + dgram_client, + &self->parent_dgram_address.unix_addr, + self->parent_dgram_address.unix_addr_len); + + if (can_connect_to_parent) { + EXPECT_EQ(0, err); + EXPECT_EQ(0, dgram_err); + } else { + EXPECT_EQ(-1, err); + EXPECT_EQ(-1, dgram_err); + EXPECT_EQ(EPERM, errno); + } + EXPECT_EQ(0, close(stream_client)); + EXPECT_EQ(0, close(dgram_client)); + + _exit(_metadata->exit_code); + return; + } + ASSERT_EQ(0, close(pipe_child[0])); + if (variant->domain_child == OTHER_SANDBOX) + create_fs_domain(_metadata); + else if (variant->domain_child == SCOPE_SANDBOX) + create_scoped_domain( + _metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + stream_server = socket(AF_UNIX, SOCK_STREAM, 0); + ASSERT_NE(-1, stream_server); + dgram_server = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, dgram_server); + + ASSERT_EQ(0, bind(stream_server, + &self->child_stream_address.unix_addr, + self->child_stream_address.unix_addr_len)); + ASSERT_EQ(0, bind(dgram_server, + &self->child_dgram_address.unix_addr, + self->child_dgram_address.unix_addr_len)); + ASSERT_EQ(0, listen(stream_server, backlog)); + + ASSERT_EQ(1, write(pipe_child[1], ".", 1)); + ASSERT_EQ(grand_child, waitpid(grand_child, &status, 0)); + ASSERT_EQ(0, close(stream_server)) + ASSERT_EQ(0, close(dgram_server)); + return; + } + ASSERT_EQ(0, close(pipe_parent[0])); + + if (variant->domain_parent == OTHER_SANDBOX) + create_fs_domain(_metadata); + else if (variant->domain_parent == SCOPE_SANDBOX) + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + stream_server = socket(AF_UNIX, SOCK_STREAM, 0); + ASSERT_NE(-1, stream_server); + dgram_server = socket(AF_UNIX, SOCK_DGRAM, 0); + ASSERT_NE(-1, dgram_server); + ASSERT_EQ(0, bind(stream_server, &self->parent_stream_address.unix_addr, + self->parent_stream_address.unix_addr_len)); + ASSERT_EQ(0, bind(dgram_server, &self->parent_dgram_address.unix_addr, + self->parent_dgram_address.unix_addr_len)); + + ASSERT_EQ(0, listen(stream_server, backlog)); + + ASSERT_EQ(1, write(pipe_parent[1], ".", 1)); + ASSERT_EQ(child, waitpid(child, &status, 0)); + ASSERT_EQ(0, close(stream_server)); + ASSERT_EQ(0, close(dgram_server)); + + if (WIFSIGNALED(status) || !WIFEXITED(status) || + WEXITSTATUS(status) != EXIT_SUCCESS) + _metadata->exit_code = KSFT_FAIL; +} + +/* clang-format off */ +FIXTURE(outside_socket) +{ + struct service_fixture address, transit_address; +}; +/* clang-format on */ + +FIXTURE_VARIANT(outside_socket) +{ + const bool domain_server; + const bool domain_server_socket; + const int type; +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(outside_socket, allow_dgram_server_sock_domain) { + /* clang-format on */ + .domain_server = false, + .domain_server_socket = true, + .type = SOCK_DGRAM, +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(outside_socket, deny_dgram_server_domain) { + /* clang-format on */ + .domain_server = true, + .domain_server_socket = false, + .type = SOCK_DGRAM, +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(outside_socket, allow_stream_server_sock_domain) { + /* clang-format on */ + .domain_server = false, + .domain_server_socket = true, + .type = SOCK_STREAM, +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(outside_socket, deny_stream_server_domain) { + /* clang-format on */ + .domain_server = true, + .domain_server_socket = false, + .type = SOCK_STREAM, +}; + +FIXTURE_SETUP(outside_socket) +{ + memset(&self->transit_address, 0, sizeof(self->transit_address)); + set_unix_address(&self->transit_address, 0); + memset(&self->address, 0, sizeof(self->address)); + set_unix_address(&self->address, 1); +} + +FIXTURE_TEARDOWN(outside_socket) +{ +} + +/* + * Test unix_stream_connect and unix_may_send for parent and child processes + * when connecting socket has different domain than the process using it. + */ +TEST_F(outside_socket, socket_with_different_domain) +{ + pid_t child; + int err, status; + int pipe_child[2], pipe_parent[2]; + char buf_parent; + int sock; + + drop_caps(_metadata); + ASSERT_EQ(0, pipe2(pipe_child, O_CLOEXEC)); + ASSERT_EQ(0, pipe2(pipe_parent, O_CLOEXEC)); + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + char buf_child; + + ASSERT_EQ(0, close(pipe_parent[1])); + ASSERT_EQ(0, close(pipe_child[0])); + + /* client always has domain */ + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + if (variant->domain_server_socket) { + int data_socket, stream_server; + int fd_sock = socket(AF_UNIX, variant->type, 0); + + ASSERT_NE(-1, fd_sock); + + stream_server = socket(AF_UNIX, SOCK_STREAM, 0); + + ASSERT_NE(-1, stream_server); + ASSERT_EQ(0, bind(stream_server, + &self->transit_address.unix_addr, + self->transit_address.unix_addr_len)); + ASSERT_EQ(0, listen(stream_server, backlog)); + + ASSERT_EQ(1, write(pipe_child[1], ".", 1)); + + data_socket = accept(stream_server, NULL, NULL); + + ASSERT_EQ(0, send_fd(data_socket, fd_sock)); + ASSERT_EQ(0, close(fd_sock)); + ASSERT_EQ(0, close(stream_server)); + } + + sock = socket(AF_UNIX, variant->type, 0); + ASSERT_NE(-1, sock); + /* wait for parent signal for connection */ + ASSERT_EQ(1, read(pipe_parent[0], &buf_child, 1)); + + err = connect(sock, &self->address.unix_addr, + self->address.unix_addr_len); + if (!variant->domain_server_socket) { + EXPECT_EQ(-1, err); + EXPECT_EQ(EPERM, errno); + } else { + EXPECT_EQ(0, err); + } + ASSERT_EQ(0, close(sock)); + _exit(_metadata->exit_code); + return; + } + ASSERT_EQ(0, close(pipe_child[1])); + ASSERT_EQ(0, close(pipe_parent[0])); + + if (!variant->domain_server_socket) { + sock = socket(AF_UNIX, variant->type, 0); + } else { + int cli = socket(AF_UNIX, SOCK_STREAM, 0); + + ASSERT_NE(-1, cli); + ASSERT_EQ(1, read(pipe_child[0], &buf_parent, 1)); + ASSERT_EQ(0, connect(cli, &self->transit_address.unix_addr, + self->transit_address.unix_addr_len)); + + sock = recv_fd(cli); + ASSERT_LE(0, sock); + ASSERT_EQ(0, close(cli)); + } + + ASSERT_NE(-1, sock); + + if (variant->domain_server) + create_scoped_domain(_metadata, + LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET); + + ASSERT_EQ(0, bind(sock, &self->address.unix_addr, + self->address.unix_addr_len)); + if (variant->type == SOCK_STREAM) + ASSERT_EQ(0, listen(sock, backlog)); + /* signal to child that parent is listening */ + ASSERT_EQ(1, write(pipe_parent[1], ".", 1)); + + ASSERT_EQ(child, waitpid(child, &status, 0)); + ASSERT_EQ(0, close(sock)); + + if (WIFSIGNALED(status) || !WIFEXITED(status) || + WEXITSTATUS(status) != EXIT_SUCCESS) + _metadata->exit_code = KSFT_FAIL; +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/landlock/scoped_base_variants.h b/tools/testing/selftests/landlock/scoped_base_variants.h new file mode 100644 index 000000000000..a070ad4693e6 --- /dev/null +++ b/tools/testing/selftests/landlock/scoped_base_variants.h @@ -0,0 +1,154 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Landlock scoped_domains variants + * + * Copyright © 2024 Tahera Fahimi + */ + +#define _GNU_SOURCE + +/* clang-format on */ +FIXTURE_VARIANT(scoped_domains) +{ + bool domain_both; + bool domain_parent; + bool domain_child; +}; + +/* + * No domain + * + * P1-. P1 -> P2 : allow + * \ P2 -> P1 : allow + * 'P2 + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, without_domain) { + /* clang-format on */ + .domain_both = false, + .domain_parent = false, + .domain_child = false, +}; + +/* + * Child domain + * + * P1--. P1 -> P2 : allow + * \ P2 -> P1 : deny + * .'-----. + * | P2 | + * '------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, with_child_domain) { + /* clang-format on */ + .domain_both = false, + .domain_parent = false, + .domain_child = true, +}; + +/* + * Parent domain + * .------. + * | P1 --. P1 -> P2 : deny + * '------' \ P2 -> P1 : allow + * ' + * P2 + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, with_parent_domain) { + /* clang-format on */ + .domain_both = false, + .domain_parent = true, + .domain_child = false, +}; + +/* + * Parent + child domain (siblings) + * .------. + * | P1 ---. P1 -> P2 : deny + * '------' \ P2 -> P1 : deny + * .---'--. + * | P2 | + * '------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, with_sibling_domain) { + /* clang-format on */ + .domain_both = false, + .domain_parent = true, + .domain_child = true, +}; + +/* + * Same domain (inherited) + * .-------------. + * | P1----. | P1 -> P2 : allow + * | \ | P2 -> P1 : allow + * | ' | + * | P2 | + * '-------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, inherited_domain) { + /* clang-format on */ + .domain_both = true, + .domain_parent = false, + .domain_child = false, +}; + +/* + * Inherited + child domain + * .-----------------. + * | P1----. | P1 -> P2 : allow + * | \ | P2 -> P1 : deny + * | .-'----. | + * | | P2 | | + * | '------' | + * '-----------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, nested_domain) { + /* clang-format on */ + .domain_both = true, + .domain_parent = false, + .domain_child = true, +}; + +/* + * Inherited + parent domain + * .-----------------. + * |.------. | P1 -> P2 : deny + * || P1 ----. | P2 -> P1 : allow + * |'------' \ | + * | ' | + * | P2 | + * '-----------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, with_nested_and_parent_domain) { + /* clang-format on */ + .domain_both = true, + .domain_parent = true, + .domain_child = false, +}; + +/* + * Inherited + parent and child domain (siblings) + * .-----------------. + * | .------. | P1 -> P2 : deny + * | | P1 . | P2 -> P1 : deny + * | '------'\ | + * | \ | + * | .--'---. | + * | | P2 | | + * | '------' | + * '-----------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_domains, with_forked_domains) { + /* clang-format on */ + .domain_both = true, + .domain_parent = true, + .domain_child = true, +}; diff --git a/tools/testing/selftests/landlock/scoped_common.h b/tools/testing/selftests/landlock/scoped_common.h new file mode 100644 index 000000000000..a9a912d30c4d --- /dev/null +++ b/tools/testing/selftests/landlock/scoped_common.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Landlock scope test helpers + * + * Copyright © 2024 Tahera Fahimi + */ + +#define _GNU_SOURCE + +#include + +static void create_scoped_domain(struct __test_metadata *const _metadata, + const __u16 scope) +{ + int ruleset_fd; + const struct landlock_ruleset_attr ruleset_attr = { + .scoped = scope, + }; + + ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd) + { + TH_LOG("Failed to create a ruleset: %s", strerror(errno)); + } + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); +} diff --git a/tools/testing/selftests/landlock/scoped_multiple_domain_variants.h b/tools/testing/selftests/landlock/scoped_multiple_domain_variants.h new file mode 100644 index 000000000000..f035c9401a5f --- /dev/null +++ b/tools/testing/selftests/landlock/scoped_multiple_domain_variants.h @@ -0,0 +1,154 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Landlock variants for three processes with various domains. + * + * Copyright © 2024 Tahera Fahimi + */ + +#define _GNU_SOURCE + +enum sandbox_type { + NO_SANDBOX, + SCOPE_SANDBOX, + /* Any other type of sandboxing domain */ + OTHER_SANDBOX, +}; + +/* clang-format on */ +FIXTURE_VARIANT(scoped_vs_unscoped_sockets) +{ + const int domain_all; + const int domain_parent; + const int domain_children; + const int domain_child; + const int domain_grand_child; +}; + +/* + * .-----------------. + * | ####### | P3 -> P2 : allow + * | P1----# P2 # | P3 -> P1 : deny + * | # | # | + * | # P3 # | + * | ####### | + * '-----------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, deny_scoped) { + .domain_all = OTHER_SANDBOX, + .domain_parent = NO_SANDBOX, + .domain_children = SCOPE_SANDBOX, + .domain_child = NO_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * ################### + * # ####### # P3 -> P2 : allow + * # P1----# P2 # # P3 -> P1 : deny + * # # | # # + * # # P3 # # + * # ####### # + * ################### + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, all_scoped) { + .domain_all = SCOPE_SANDBOX, + .domain_parent = NO_SANDBOX, + .domain_children = SCOPE_SANDBOX, + .domain_child = NO_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * .-----------------. + * | .-----. | P3 -> P2 : allow + * | P1----| P2 | | P3 -> P1 : allow + * | | | | + * | | P3 | | + * | '-----' | + * '-----------------' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, allow_with_other_domain) { + .domain_all = OTHER_SANDBOX, + .domain_parent = NO_SANDBOX, + .domain_children = OTHER_SANDBOX, + .domain_child = NO_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * .----. ###### P3 -> P2 : allow + * | P1 |----# P2 # P3 -> P1 : allow + * '----' ###### + * | + * P3 + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, allow_with_one_domain) { + .domain_all = NO_SANDBOX, + .domain_parent = OTHER_SANDBOX, + .domain_children = NO_SANDBOX, + .domain_child = SCOPE_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * ###### .-----. P3 -> P2 : allow + * # P1 #----| P2 | P3 -> P1 : allow + * ###### '-----' + * | + * P3 + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, allow_with_grand_parent_scoped) { + .domain_all = NO_SANDBOX, + .domain_parent = SCOPE_SANDBOX, + .domain_children = NO_SANDBOX, + .domain_child = OTHER_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * ###### ###### P3 -> P2 : allow + * # P1 #----# P2 # P3 -> P1 : allow + * ###### ###### + * | + * .----. + * | P3 | + * '----' + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, allow_with_parents_domain) { + .domain_all = NO_SANDBOX, + .domain_parent = SCOPE_SANDBOX, + .domain_children = NO_SANDBOX, + .domain_child = SCOPE_SANDBOX, + .domain_grand_child = NO_SANDBOX, + /* clang-format on */ +}; + +/* + * ###### P3 -> P2 : deny + * # P1 #----P2 P3 -> P1 : deny + * ###### | + * | + * ###### + * # P3 # + * ###### + */ +/* clang-format off */ +FIXTURE_VARIANT_ADD(scoped_vs_unscoped_sockets, deny_with_self_and_grandparent_domain) { + .domain_all = NO_SANDBOX, + .domain_parent = SCOPE_SANDBOX, + .domain_children = NO_SANDBOX, + .domain_child = NO_SANDBOX, + .domain_grand_child = SCOPE_SANDBOX, + /* clang-format on */ +};