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From 900251c41dab192ff863024e07864c09462e86d2 Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Mon, 20 Mar 2017 12:24:09 +0100
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Subject: [PATCH] test-capability: rebase to upstream version
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Related: #1387398
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---
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 src/test/test-capability.c                         | 80 +++++++++++++++++++---
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 src/test/test-execute.c                            | 43 ++++++++++++
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 ...ec-capabilityambientset-merge-nfsnobody.service |  9 +++
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 test/exec-capabilityambientset-merge.service       |  9 +++
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 test/exec-capabilityambientset-nfsnobody.service   |  8 +++
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 test/exec-capabilityambientset.service             |  8 +++
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 test/exec-capabilityboundingset-invert.service     |  7 ++
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 test/exec-capabilityboundingset-merge.service      |  8 +++
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 test/exec-capabilityboundingset-reset.service      |  8 +++
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 test/exec-capabilityboundingset-simple.service     |  7 ++
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 10 files changed, 179 insertions(+), 8 deletions(-)
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 create mode 100644 test/exec-capabilityambientset-merge-nfsnobody.service
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 create mode 100644 test/exec-capabilityambientset-merge.service
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 create mode 100644 test/exec-capabilityambientset-nfsnobody.service
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 create mode 100644 test/exec-capabilityambientset.service
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 create mode 100644 test/exec-capabilityboundingset-invert.service
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 create mode 100644 test/exec-capabilityboundingset-merge.service
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 create mode 100644 test/exec-capabilityboundingset-reset.service
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 create mode 100644 test/exec-capabilityboundingset-simple.service
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diff --git a/src/test/test-capability.c b/src/test/test-capability.c
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index 43769923b..67a9ec2d1 100644
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--- a/src/test/test-capability.c
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+++ b/src/test/test-capability.c
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@@ -17,21 +17,22 @@
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   along with systemd; If not, see <http://www.gnu.org/licenses/>.
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 ***/
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-#include <sys/types.h>
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-#include <sys/wait.h>
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-#include <sys/capability.h>
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-#include <sys/socket.h>
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 #include <netinet/in.h>
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 #include <pwd.h>
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+#include <sys/capability.h>
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+#include <sys/prctl.h>
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+#include <sys/socket.h>
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+#include <sys/wait.h>
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 #include <unistd.h>
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 #include "capability.h"
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-#include "util.h"
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 #include "macro.h"
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+#include "util.h"
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 static uid_t test_uid = -1;
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 static gid_t test_gid = -1;
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-// We keep CAP_DAC_OVERRIDE to avoid errors with gcov when doing test coverage
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+
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+/* We keep CAP_DAC_OVERRIDE to avoid errors with gcov when doing test coverage */
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 static uint64_t test_flags = 1ULL << CAP_DAC_OVERRIDE;
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 static void fork_test(void (*test_func)(void)) {
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@@ -65,8 +66,9 @@ static void show_capabilities(void) {
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         cap_free(text);
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 }
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-static int setup_tests(void) {
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+static int setup_tests(bool *run_ambient) {
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         struct passwd *nobody;
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+        int r;
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         nobody = getpwnam("nobody");
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         if (!nobody) {
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@@ -76,6 +78,18 @@ static int setup_tests(void) {
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         test_uid = nobody->pw_uid;
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         test_gid = nobody->pw_gid;
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+        *run_ambient = false;
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+
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+        r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0);
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+
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+        /* There's support for PR_CAP_AMBIENT if the prctl() call
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+         * succeeded or error code was something else than EINVAL. The
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+         * EINVAL check should be good enough to rule out false
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+         * positives. */
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+
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+        if (r >= 0 || errno != EINVAL)
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+                *run_ambient = true;
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+
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         return 0;
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 }
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@@ -139,8 +153,53 @@ static void test_have_effective_cap(void) {
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         assert_se(!have_effective_cap(CAP_CHOWN));
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 }
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+static void test_update_inherited_set(void) {
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+        cap_t caps;
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+        uint64_t set = 0;
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+        cap_flag_value_t fv;
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+
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+        caps = cap_get_proc();
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+        assert_se(caps);
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+        assert_se(!cap_get_flag(caps, CAP_CHOWN, CAP_INHERITABLE, &fv));
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+        assert(fv == CAP_CLEAR);
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+
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+        set = (UINT64_C(1) << CAP_CHOWN);
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+
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+        assert_se(!capability_update_inherited_set(caps, set));
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+        assert_se(!cap_get_flag(caps, CAP_CHOWN, CAP_INHERITABLE, &fv));
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+        assert(fv == CAP_SET);
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+
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+        cap_free(caps);
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+}
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+
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+static void test_set_ambient_caps(void) {
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+        cap_t caps;
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+        uint64_t set = 0;
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+        cap_flag_value_t fv;
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+
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+        caps = cap_get_proc();
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+        assert_se(caps);
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+        assert_se(!cap_get_flag(caps, CAP_CHOWN, CAP_INHERITABLE, &fv));
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+        assert(fv == CAP_CLEAR);
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+        cap_free(caps);
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+
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+        assert_se(prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_CHOWN, 0, 0) == 0);
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+
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+        set = (UINT64_C(1) << CAP_CHOWN);
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+
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+        assert_se(!capability_ambient_set_apply(set, true));
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+
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+        caps = cap_get_proc();
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+        assert_se(!cap_get_flag(caps, CAP_CHOWN, CAP_INHERITABLE, &fv));
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+        assert(fv == CAP_SET);
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+        cap_free(caps);
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+
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+        assert_se(prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_CHOWN, 0, 0) == 1);
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+}
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+
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 int main(int argc, char *argv[]) {
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         int r;
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+        bool run_ambient;
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         log_parse_environment();
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         log_open();
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@@ -148,14 +207,19 @@ int main(int argc, char *argv[]) {
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         if (getuid() != 0)
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                 return EXIT_TEST_SKIP;
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-        r = setup_tests();
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+        r = setup_tests(&run_ambient);
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         if (r < 0)
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                 return -r;
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         show_capabilities();
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         test_drop_privileges();
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+        test_update_inherited_set();
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+
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         fork_test(test_have_effective_cap);
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+        if (run_ambient)
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+                fork_test(test_set_ambient_caps);
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+
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         return 0;
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 }
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diff --git a/src/test/test-execute.c b/src/test/test-execute.c
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index 6e5567c3e..8e70702cb 100644
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--- a/src/test/test-execute.c
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+++ b/src/test/test-execute.c
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@@ -17,7 +17,11 @@
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   along with systemd; If not, see <http://www.gnu.org/licenses/>.
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 ***/
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+#include <grp.h>
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+#include <pwd.h>
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 #include <stdio.h>
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+#include <sys/prctl.h>
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+#include <sys/types.h>
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 #include "unit.h"
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 #include "manager.h"
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@@ -25,6 +29,7 @@
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 #include "macro.h"
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 #include "strv.h"
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 #include "mkdir.h"
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+#include "path-util.h"
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 typedef void (*test_function_t)(Manager *m);
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@@ -177,6 +182,42 @@ static void test_exec_runtimedirectory(Manager *m) {
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         test(m, "exec-runtimedirectory-owner.service", 0, CLD_EXITED);
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 }
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+static void test_exec_capabilityboundingset(Manager *m) {
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+        int r;
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+
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+        r = find_binary("capsh", true, NULL);
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+        if (r < 0) {
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+                log_error_errno(r, "Skipping %s, could not find capsh binary: %m", __func__);
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+                return;
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+        }
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+
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+        test(m, "exec-capabilityboundingset-simple.service", 0, CLD_EXITED);
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+        test(m, "exec-capabilityboundingset-reset.service", 0, CLD_EXITED);
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+        test(m, "exec-capabilityboundingset-merge.service", 0, CLD_EXITED);
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+        test(m, "exec-capabilityboundingset-invert.service", 0, CLD_EXITED);
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+}
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+
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+static void test_exec_capabilityambientset(Manager *m) {
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+        int r;
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+
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+        /* Check if the kernel has support for ambient capabilities. Run
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+         * the tests only if that's the case. Clearing all ambient
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+         * capabilities is fine, since we are expecting them to be unset
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+         * in the first place for the tests. */
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+        r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0);
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+        if (r >= 0 || errno != EINVAL) {
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+                if (getpwnam("nobody")) {
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+                        test(m, "exec-capabilityambientset.service", 0, CLD_EXITED);
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+                        test(m, "exec-capabilityambientset-merge.service", 0, CLD_EXITED);
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+                } else if (getpwnam("nfsnobody")) {
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+                        test(m, "exec-capabilityambientset-nfsnobody.service", 0, CLD_EXITED);
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+                        test(m, "exec-capabilityambientset-merge-nfsnobody.service", 0, CLD_EXITED);
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+                } else
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+                        log_error_errno(errno, "Skipping %s, could not find nobody/nfsnobody user: %m", __func__);
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+        } else
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+                log_error_errno(errno, "Skipping %s, the kernel does not support ambient capabilities: %m", __func__);
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+}
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+
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 int main(int argc, char *argv[]) {
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         test_function_t tests[] = {
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                 test_exec_workingdirectory,
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@@ -192,6 +233,8 @@ int main(int argc, char *argv[]) {
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                 test_exec_passenvironment,
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                 test_exec_umask,
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                 test_exec_runtimedirectory,
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+                test_exec_capabilityboundingset,
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+                test_exec_capabilityambientset,
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                 NULL,
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         };
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         test_function_t *test = NULL;
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diff --git a/test/exec-capabilityambientset-merge-nfsnobody.service b/test/exec-capabilityambientset-merge-nfsnobody.service
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new file mode 100644
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index 000000000..00bec581b
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--- /dev/null
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+++ b/test/exec-capabilityambientset-merge-nfsnobody.service
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@@ -0,0 +1,9 @@
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+[Unit]
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+Description=Test for AmbientCapabilities
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(grep "CapAmb:" /proc/self/status); test "$$c" = "CapAmb:	0000000000003000"'
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+Type=oneshot
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+User=nfsnobody
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+AmbientCapabilities=CAP_NET_ADMIN
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+AmbientCapabilities=CAP_NET_RAW
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diff --git a/test/exec-capabilityambientset-merge.service b/test/exec-capabilityambientset-merge.service
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new file mode 100644
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index 000000000..64964380e
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--- /dev/null
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+++ b/test/exec-capabilityambientset-merge.service
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@@ -0,0 +1,9 @@
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+[Unit]
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+Description=Test for AmbientCapabilities
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(grep "CapAmb:" /proc/self/status); test "$$c" = "CapAmb:	0000000000003000"'
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+Type=oneshot
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+User=nobody
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+AmbientCapabilities=CAP_NET_ADMIN
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+AmbientCapabilities=CAP_NET_RAW
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diff --git a/test/exec-capabilityambientset-nfsnobody.service b/test/exec-capabilityambientset-nfsnobody.service
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new file mode 100644
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index 000000000..614cfdd58
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--- /dev/null
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+++ b/test/exec-capabilityambientset-nfsnobody.service
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@@ -0,0 +1,8 @@
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+[Unit]
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+Description=Test for AmbientCapabilities
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(grep "CapAmb:" /proc/self/status); test "$$c" = "CapAmb:	0000000000003000"'
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+Type=oneshot
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+User=nfsnobody
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+AmbientCapabilities=CAP_NET_ADMIN CAP_NET_RAW
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diff --git a/test/exec-capabilityambientset.service b/test/exec-capabilityambientset.service
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new file mode 100644
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index 000000000..d63f884ef
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--- /dev/null
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+++ b/test/exec-capabilityambientset.service
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@@ -0,0 +1,8 @@
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+[Unit]
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+Description=Test for AmbientCapabilities
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(grep "CapAmb:" /proc/self/status); test "$$c" = "CapAmb:	0000000000003000"'
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+Type=oneshot
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+User=nobody
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+AmbientCapabilities=CAP_NET_ADMIN CAP_NET_RAW
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diff --git a/test/exec-capabilityboundingset-invert.service b/test/exec-capabilityboundingset-invert.service
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new file mode 100644
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index 000000000..fd5d24870
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--- /dev/null
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+++ b/test/exec-capabilityboundingset-invert.service
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@@ -0,0 +1,7 @@
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+[Unit]
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+Description=Test for CapabilityBoundingSet
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "^Bounding set .*cap_chown"); test -z "$$c"'
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+Type=oneshot
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+CapabilityBoundingSet=~CAP_CHOWN
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diff --git a/test/exec-capabilityboundingset-merge.service b/test/exec-capabilityboundingset-merge.service
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new file mode 100644
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index 000000000..5c7fcaf43
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--- /dev/null
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+++ b/test/exec-capabilityboundingset-merge.service
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@@ -0,0 +1,8 @@
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+[Unit]
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+Description=Test for CapabilityBoundingSet
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "Bounding set "); test "$$c" = "Bounding set =cap_chown,cap_fowner,cap_kill"'
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+Type=oneshot
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+CapabilityBoundingSet=CAP_FOWNER
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+CapabilityBoundingSet=CAP_KILL CAP_CHOWN
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diff --git a/test/exec-capabilityboundingset-reset.service b/test/exec-capabilityboundingset-reset.service
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new file mode 100644
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index 000000000..d7d332020
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--- /dev/null
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+++ b/test/exec-capabilityboundingset-reset.service
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@@ -0,0 +1,8 @@
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+[Unit]
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+Description=Test for CapabilityBoundingSet
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "Bounding set "); test "$$c" = "Bounding set ="'
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+Type=oneshot
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+CapabilityBoundingSet=CAP_FOWNER CAP_KILL
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+CapabilityBoundingSet=
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diff --git a/test/exec-capabilityboundingset-simple.service b/test/exec-capabilityboundingset-simple.service
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new file mode 100644
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index 000000000..bf1a7f575
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--- /dev/null
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+++ b/test/exec-capabilityboundingset-simple.service
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@@ -0,0 +1,7 @@
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+[Unit]
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+Description=Test for CapabilityBoundingSet
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+
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+[Service]
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+ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "Bounding set "); test "$$c" = "Bounding set =cap_fowner,cap_kill"'
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+Type=oneshot
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+CapabilityBoundingSet=CAP_FOWNER CAP_KILL