[deliverable/linux.git] / tools / testing / selftests / capabilities / test_execve.c

#define _GNU_SOURCE

#include <cap-ng.h>
#include <err.h>
#include <linux/capability.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdarg.h>
#include <sched.h>
#include <sys/mount.h>
#include <limits.h>
#include <libgen.h>
#include <malloc.h>
#include <sys/wait.h>
#include <sys/prctl.h>
#include <sys/stat.h>

#ifndef PR_CAP_AMBIENT
#define PR_CAP_AMBIENT			47
# define PR_CAP_AMBIENT_IS_SET		1
# define PR_CAP_AMBIENT_RAISE		2
# define PR_CAP_AMBIENT_LOWER		3
# define PR_CAP_AMBIENT_CLEAR_ALL	4
#endif

static int nerrs;

static void vmaybe_write_file(bool enoent_ok, char *filename, char *fmt, va_list ap)
{
	char buf[4096];
	int fd;
	ssize_t written;
	int buf_len;

	buf_len = vsnprintf(buf, sizeof(buf), fmt, ap);
	if (buf_len < 0) {
		err(1, "vsnprintf failed");
	}
	if (buf_len >= sizeof(buf)) {
		errx(1, "vsnprintf output truncated");
	}

	fd = open(filename, O_WRONLY);
	if (fd < 0) {
		if ((errno == ENOENT) && enoent_ok)
			return;
		err(1, "open of %s failed", filename);
	}
	written = write(fd, buf, buf_len);
	if (written != buf_len) {
		if (written >= 0) {
			errx(1, "short write to %s", filename);
		} else {
			err(1, "write to %s failed", filename);
		}
	}
	if (close(fd) != 0) {
		err(1, "close of %s failed", filename);
	}
}

static void maybe_write_file(char *filename, char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vmaybe_write_file(true, filename, fmt, ap);
	va_end(ap);
}

static void write_file(char *filename, char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vmaybe_write_file(false, filename, fmt, ap);
	va_end(ap);
}

static bool create_and_enter_ns(uid_t inner_uid)
{
	uid_t outer_uid;
	gid_t outer_gid;
	int i;
	bool have_outer_privilege;

	outer_uid = getuid();
	outer_gid = getgid();

	/*
	 * TODO: If we're already root, we could skip creating the userns.
	 */

	if (unshare(CLONE_NEWNS) == 0) {
		printf("[NOTE]\tUsing global UIDs for tests\n");
		if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) != 0)
			err(1, "PR_SET_KEEPCAPS");
		if (setresuid(inner_uid, inner_uid, -1) != 0)
			err(1, "setresuid");

		// Re-enable effective caps
		capng_get_caps_process();
		for (i = 0; i < CAP_LAST_CAP; i++)
			if (capng_have_capability(CAPNG_PERMITTED, i))
				capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, i);
		if (capng_apply(CAPNG_SELECT_CAPS) != 0)
			err(1, "capng_apply");

		have_outer_privilege = true;
	} else if (unshare(CLONE_NEWUSER | CLONE_NEWNS) == 0) {
		printf("[NOTE]\tUsing a user namespace for tests\n");
		maybe_write_file("/proc/self/setgroups", "deny");
		write_file("/proc/self/uid_map", "%d %d 1", inner_uid, outer_uid);
		write_file("/proc/self/gid_map", "0 %d 1", outer_gid);

		have_outer_privilege = false;
	} else {
		errx(1, "must be root or be able to create a userns");
	}

	if (mount("none", "/", NULL, MS_REC | MS_PRIVATE, NULL) != 0)
		err(1, "remount everything private");

	return have_outer_privilege;
}

static void chdir_to_tmpfs(void)
{
	char cwd[PATH_MAX];
	if (getcwd(cwd, sizeof(cwd)) != cwd)
		err(1, "getcwd");

	if (mount("private_tmp", ".", "tmpfs", 0, "mode=0777") != 0)
		err(1, "mount private tmpfs");

	if (chdir(cwd) != 0)
		err(1, "chdir to private tmpfs");

	if (umount2(".", MNT_DETACH) != 0)
		err(1, "detach private tmpfs");
}

static void copy_fromat_to(int fromfd, const char *fromname, const char *toname)
{
	int from = openat(fromfd, fromname, O_RDONLY);
	if (from == -1)
		err(1, "open copy source");

	int to = open(toname, O_CREAT | O_WRONLY | O_EXCL, 0700);

	while (true) {
		char buf[4096];
		ssize_t sz = read(from, buf, sizeof(buf));
		if (sz == 0)
			break;
		if (sz < 0)
			err(1, "read");

		if (write(to, buf, sz) != sz)
			err(1, "write");	/* no short writes on tmpfs */
	}

	close(from);
	close(to);
}

static bool fork_wait(void)
{
	pid_t child = fork();
	if (child == 0) {
		nerrs = 0;
		return true;
	} else if (child > 0) {
		int status;
		if (waitpid(child, &status, 0) != child ||
		    !WIFEXITED(status)) {
			printf("[FAIL]\tChild died\n");
			nerrs++;
		} else if (WEXITSTATUS(status) != 0) {
			printf("[FAIL]\tChild failed\n");
			nerrs++;
		} else {
			printf("[OK]\tChild succeeded\n");
		}

		return false;
	} else {
		err(1, "fork");
	}
}

static void exec_other_validate_cap(const char *name,
				    bool eff, bool perm, bool inh, bool ambient)
{
	execl(name, name, (eff ? "1" : "0"),
	      (perm ? "1" : "0"), (inh ? "1" : "0"), (ambient ? "1" : "0"),
	      NULL);
	err(1, "execl");
}

static void exec_validate_cap(bool eff, bool perm, bool inh, bool ambient)
{
	exec_other_validate_cap("./validate_cap", eff, perm, inh, ambient);
}

static int do_tests(int uid, const char *our_path)
{
	bool have_outer_privilege = create_and_enter_ns(uid);

	int ourpath_fd = open(our_path, O_RDONLY | O_DIRECTORY);
	if (ourpath_fd == -1)
		err(1, "open '%s'", our_path);

	chdir_to_tmpfs();

	copy_fromat_to(ourpath_fd, "validate_cap", "validate_cap");

	if (have_outer_privilege) {
		uid_t gid = getegid();

		copy_fromat_to(ourpath_fd, "validate_cap",
			       "validate_cap_suidroot");
		if (chown("validate_cap_suidroot", 0, -1) != 0)
			err(1, "chown");
		if (chmod("validate_cap_suidroot", S_ISUID | 0700) != 0)
			err(1, "chmod");

		copy_fromat_to(ourpath_fd, "validate_cap",
			       "validate_cap_suidnonroot");
		if (chown("validate_cap_suidnonroot", uid + 1, -1) != 0)
			err(1, "chown");
		if (chmod("validate_cap_suidnonroot", S_ISUID | 0700) != 0)
			err(1, "chmod");

		copy_fromat_to(ourpath_fd, "validate_cap",
			       "validate_cap_sgidroot");
		if (chown("validate_cap_sgidroot", -1, 0) != 0)
			err(1, "chown");
		if (chmod("validate_cap_sgidroot", S_ISGID | 0710) != 0)
			err(1, "chmod");

		copy_fromat_to(ourpath_fd, "validate_cap",
			       "validate_cap_sgidnonroot");
		if (chown("validate_cap_sgidnonroot", -1, gid + 1) != 0)
			err(1, "chown");
		if (chmod("validate_cap_sgidnonroot", S_ISGID | 0710) != 0)
			err(1, "chmod");
}

	capng_get_caps_process();

	/* Make sure that i starts out clear */
	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
		err(1, "capng_apply");

	if (uid == 0) {
		printf("[RUN]\tRoot => ep\n");
		if (fork_wait())
			exec_validate_cap(true, true, false, false);
	} else {
		printf("[RUN]\tNon-root => no caps\n");
		if (fork_wait())
			exec_validate_cap(false, false, false, false);
	}

	printf("[OK]\tCheck cap_ambient manipulation rules\n");

	/* We should not be able to add ambient caps yet. */
	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != -1 || errno != EPERM) {
		if (errno == EINVAL)
			printf("[FAIL]\tPR_CAP_AMBIENT_RAISE isn't supported\n");
		else
			printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have failed eith EPERM on a non-inheritable cap\n");
		return 1;
	}
	printf("[OK]\tPR_CAP_AMBIENT_RAISE failed on non-inheritable cap\n");

	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_RAW);
	capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_NET_RAW);
	capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_NET_RAW);
	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
		err(1, "capng_apply");
	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_RAW, 0, 0, 0) != -1 || errno != EPERM) {
		printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have failed on a non-permitted cap\n");
		return 1;
	}
	printf("[OK]\tPR_CAP_AMBIENT_RAISE failed on non-permitted cap\n");

	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
		err(1, "capng_apply");
	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
		printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have succeeded\n");
		return 1;
	}
	printf("[OK]\tPR_CAP_AMBIENT_RAISE worked\n");

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 1) {
		printf("[FAIL]\tPR_CAP_AMBIENT_IS_SET is broken\n");
		return 1;
	}

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0, 0) != 0)
		err(1, "PR_CAP_AMBIENT_CLEAR_ALL");

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
		printf("[FAIL]\tPR_CAP_AMBIENT_CLEAR_ALL didn't work\n");
		return 1;
	}

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
		err(1, "PR_CAP_AMBIENT_RAISE");

	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
		err(1, "capng_apply");

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
		printf("[FAIL]\tDropping I should have dropped A\n");
		return 1;
	}

	printf("[OK]\tBasic manipulation appears to work\n");

	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
		err(1, "capng_apply");
	if (uid == 0) {
		printf("[RUN]\tRoot +i => eip\n");
		if (fork_wait())
			exec_validate_cap(true, true, true, false);
	} else {
		printf("[RUN]\tNon-root +i => i\n");
		if (fork_wait())
			exec_validate_cap(false, false, true, false);
	}

	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
		err(1, "PR_CAP_AMBIENT_RAISE");

	printf("[RUN]\tUID %d +ia => eipa\n", uid);
	if (fork_wait())
		exec_validate_cap(true, true, true, true);

	/* The remaining tests need real privilege */

	if (!have_outer_privilege) {
		printf("[SKIP]\tSUID/SGID tests (needs privilege)\n");
		goto done;
	}

	if (uid == 0) {
		printf("[RUN]\tRoot +ia, suidroot => eipa\n");
		if (fork_wait())
			exec_other_validate_cap("./validate_cap_suidroot",
						true, true, true, true);

		printf("[RUN]\tRoot +ia, suidnonroot => ip\n");
		if (fork_wait())
			exec_other_validate_cap("./validate_cap_suidnonroot",
						false, true, true, false);

		printf("[RUN]\tRoot +ia, sgidroot => eipa\n");
		if (fork_wait())
			exec_other_validate_cap("./validate_cap_sgidroot",
						true, true, true, true);

		if (fork_wait()) {
			printf("[RUN]\tRoot, gid != 0, +ia, sgidroot => eip\n");
			if (setresgid(1, 1, 1) != 0)
				err(1, "setresgid");
			exec_other_validate_cap("./validate_cap_sgidroot",
						true, true, true, false);
		}

		printf("[RUN]\tRoot +ia, sgidnonroot => eip\n");
		if (fork_wait())
			exec_other_validate_cap("./validate_cap_sgidnonroot",
						true, true, true, false);
	} else {
		printf("[RUN]\tNon-root +ia, sgidnonroot => i\n");
		exec_other_validate_cap("./validate_cap_sgidnonroot",
						false, false, true, false);

		if (fork_wait()) {
			printf("[RUN]\tNon-root +ia, sgidroot => i\n");
			if (setresgid(1, 1, 1) != 0)
				err(1, "setresgid");
			exec_other_validate_cap("./validate_cap_sgidroot",
						false, false, true, false);
		}
	}

done:
	return nerrs ? 1 : 0;
}

int main(int argc, char **argv)
{
	char *tmp1, *tmp2, *our_path;

	/* Find our path */
	tmp1 = strdup(argv[0]);
	if (!tmp1)
		err(1, "strdup");
	tmp2 = dirname(tmp1);
	our_path = strdup(tmp2);
	if (!our_path)
		err(1, "strdup");
	free(tmp1);

	if (fork_wait()) {
		printf("[RUN]\t+++ Tests with uid == 0 +++\n");
		return do_tests(0, our_path);
	}

	if (fork_wait()) {
		printf("[RUN]\t+++ Tests with uid != 0 +++\n");
		return do_tests(1, our_path);
	}

	return nerrs ? 1 : 0;
}
Commit	Line	Data
32ae976e AL	1	#define _GNU_SOURCE
	2
	3	#include <cap-ng.h>
	4	#include <err.h>
	5	#include <linux/capability.h>
	6	#include <stdbool.h>
	7	#include <string.h>
	8	#include <stdio.h>
	9	#include <fcntl.h>
	10	#include <errno.h>
	11	#include <stdarg.h>
	12	#include <sched.h>
	13	#include <sys/mount.h>
	14	#include <limits.h>
	15	#include <libgen.h>
	16	#include <malloc.h>
	17	#include <sys/wait.h>
	18	#include <sys/prctl.h>
	19	#include <sys/stat.h>
	20
	21	#ifndef PR_CAP_AMBIENT
	22	#define PR_CAP_AMBIENT 47
	23	# define PR_CAP_AMBIENT_IS_SET 1
	24	# define PR_CAP_AMBIENT_RAISE 2
	25	# define PR_CAP_AMBIENT_LOWER 3
	26	# define PR_CAP_AMBIENT_CLEAR_ALL 4
	27	#endif
	28
	29	static int nerrs;
	30
	31	static void vmaybe_write_file(bool enoent_ok, char filename, char fmt, va_list ap)
	32	{
	33	char buf[4096];
	34	int fd;
	35	ssize_t written;
	36	int buf_len;
	37
	38	buf_len = vsnprintf(buf, sizeof(buf), fmt, ap);
	39	if (buf_len < 0) {
	40	err(1, "vsnprintf failed");
	41	}
	42	if (buf_len >= sizeof(buf)) {
	43	errx(1, "vsnprintf output truncated");
	44	}
	45
	46	fd = open(filename, O_WRONLY);
	47	if (fd < 0) {
	48	if ((errno == ENOENT) && enoent_ok)
	49	return;
	50	err(1, "open of %s failed", filename);
	51	}
	52	written = write(fd, buf, buf_len);
	53	if (written != buf_len) {
	54	if (written >= 0) {
	55	errx(1, "short write to %s", filename);
	56	} else {
	57	err(1, "write to %s failed", filename);
	58	}
	59	}
	60	if (close(fd) != 0) {
	61	err(1, "close of %s failed", filename);
	62	}
	63	}
	64
65	static void maybe_write_file(char filename, char fmt, ...)
66	{
67	va_list ap;
68
69	va_start(ap, fmt);
70	vmaybe_write_file(true, filename, fmt, ap);
71	va_end(ap);
72	}
73
74	static void write_file(char filename, char fmt, ...)
75	{
76	va_list ap;
77
78	va_start(ap, fmt);
79	vmaybe_write_file(false, filename, fmt, ap);
80	va_end(ap);
81	}
82
83	static bool create_and_enter_ns(uid_t inner_uid)
84	{
85	uid_t outer_uid;
86	gid_t outer_gid;
87	int i;
88	bool have_outer_privilege;
89
90	outer_uid = getuid();
91	outer_gid = getgid();
92
93	/*
94	* TODO: If we're already root, we could skip creating the userns.
95	*/
96
97	if (unshare(CLONE_NEWNS) == 0) {
98	printf("[NOTE]\tUsing global UIDs for tests\n");
99	if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) != 0)
100	err(1, "PR_SET_KEEPCAPS");
101	if (setresuid(inner_uid, inner_uid, -1) != 0)
102	err(1, "setresuid");
103
104	// Re-enable effective caps
105	capng_get_caps_process();
106	for (i = 0; i < CAP_LAST_CAP; i++)
107	if (capng_have_capability(CAPNG_PERMITTED, i))
108	capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, i);
109	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
110	err(1, "capng_apply");
111
112	have_outer_privilege = true;
113	} else if (unshare(CLONE_NEWUSER \| CLONE_NEWNS) == 0) {
114	printf("[NOTE]\tUsing a user namespace for tests\n");
115	maybe_write_file("/proc/self/setgroups", "deny");
116	write_file("/proc/self/uid_map", "%d %d 1", inner_uid, outer_uid);
117	write_file("/proc/self/gid_map", "0 %d 1", outer_gid);
118
119	have_outer_privilege = false;
120	} else {
121	errx(1, "must be root or be able to create a userns");
122	}
123
124	if (mount("none", "/", NULL, MS_REC \| MS_PRIVATE, NULL) != 0)
125	err(1, "remount everything private");
126
127	return have_outer_privilege;
128	}
129
130	static void chdir_to_tmpfs(void)
131	{
132	char cwd[PATH_MAX];
133	if (getcwd(cwd, sizeof(cwd)) != cwd)
134	err(1, "getcwd");
135
136	if (mount("private_tmp", ".", "tmpfs", 0, "mode=0777") != 0)
137	err(1, "mount private tmpfs");
138
139	if (chdir(cwd) != 0)
140	err(1, "chdir to private tmpfs");
141
142	if (umount2(".", MNT_DETACH) != 0)
143	err(1, "detach private tmpfs");
144	}
145
146	static void copy_fromat_to(int fromfd, const char fromname, const char toname)
147	{
148	int from = openat(fromfd, fromname, O_RDONLY);
149	if (from == -1)
150	err(1, "open copy source");
151
152	int to = open(toname, O_CREAT \| O_WRONLY \| O_EXCL, 0700);
153
154	while (true) {
155	char buf[4096];
156	ssize_t sz = read(from, buf, sizeof(buf));
157	if (sz == 0)
158	break;
159	if (sz < 0)
160	err(1, "read");
161
162	if (write(to, buf, sz) != sz)
163	err(1, "write"); /* no short writes on tmpfs */
164	}
165
166	close(from);
167	close(to);
168	}
169
170	static bool fork_wait(void)
171	{
172	pid_t child = fork();
173	if (child == 0) {
174	nerrs = 0;
175	return true;
176	} else if (child > 0) {
177	int status;
178	if (waitpid(child, &status, 0) != child \|\|
179	!WIFEXITED(status)) {
180	printf("[FAIL]\tChild died\n");
181	nerrs++;
182	} else if (WEXITSTATUS(status) != 0) {
183	printf("[FAIL]\tChild failed\n");
184	nerrs++;
185	} else {
186	printf("[OK]\tChild succeeded\n");
187	}
188
189	return false;
190	} else {
191	err(1, "fork");
192	}
193	}
194
195	static void exec_other_validate_cap(const char *name,
196	bool eff, bool perm, bool inh, bool ambient)
197	{
198	execl(name, name, (eff ? "1" : "0"),
199	(perm ? "1" : "0"), (inh ? "1" : "0"), (ambient ? "1" : "0"),
200	NULL);
201	err(1, "execl");
202	}
203
204	static void exec_validate_cap(bool eff, bool perm, bool inh, bool ambient)
205	{
206	exec_other_validate_cap("./validate_cap", eff, perm, inh, ambient);
207	}
208
209	static int do_tests(int uid, const char *our_path)
210	{
211	bool have_outer_privilege = create_and_enter_ns(uid);
212
213	int ourpath_fd = open(our_path, O_RDONLY \| O_DIRECTORY);
214	if (ourpath_fd == -1)
215	err(1, "open '%s'", our_path);
216
217	chdir_to_tmpfs();
218
219	copy_fromat_to(ourpath_fd, "validate_cap", "validate_cap");
220
221	if (have_outer_privilege) {
222	uid_t gid = getegid();
223
224	copy_fromat_to(ourpath_fd, "validate_cap",
225	"validate_cap_suidroot");
226	if (chown("validate_cap_suidroot", 0, -1) != 0)
227	err(1, "chown");
228	if (chmod("validate_cap_suidroot", S_ISUID \| 0700) != 0)
229	err(1, "chmod");
230
231	copy_fromat_to(ourpath_fd, "validate_cap",
232	"validate_cap_suidnonroot");
233	if (chown("validate_cap_suidnonroot", uid + 1, -1) != 0)
234	err(1, "chown");
235	if (chmod("validate_cap_suidnonroot", S_ISUID \| 0700) != 0)
236	err(1, "chmod");
237
238	copy_fromat_to(ourpath_fd, "validate_cap",
239	"validate_cap_sgidroot");
240	if (chown("validate_cap_sgidroot", -1, 0) != 0)
241	err(1, "chown");
242	if (chmod("validate_cap_sgidroot", S_ISGID \| 0710) != 0)
243	err(1, "chmod");
244
245	copy_fromat_to(ourpath_fd, "validate_cap",
246	"validate_cap_sgidnonroot");
247	if (chown("validate_cap_sgidnonroot", -1, gid + 1) != 0)
248	err(1, "chown");
249	if (chmod("validate_cap_sgidnonroot", S_ISGID \| 0710) != 0)
250	err(1, "chmod");
251	}
252
253	capng_get_caps_process();
254
255	/* Make sure that i starts out clear */
256	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
257	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
258	err(1, "capng_apply");
259
260	if (uid == 0) {
261	printf("[RUN]\tRoot => ep\n");
262	if (fork_wait())
263	exec_validate_cap(true, true, false, false);
264	} else {
265	printf("[RUN]\tNon-root => no caps\n");
266	if (fork_wait())
267	exec_validate_cap(false, false, false, false);
268	}
269
270	printf("[OK]\tCheck cap_ambient manipulation rules\n");
271
272	/* We should not be able to add ambient caps yet. */
273	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != -1 \|\| errno != EPERM) {
274	if (errno == EINVAL)
275	printf("[FAIL]\tPR_CAP_AMBIENT_RAISE isn't supported\n");
276	else
277	printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have failed eith EPERM on a non-inheritable cap\n");
278	return 1;
279	}
280	printf("[OK]\tPR_CAP_AMBIENT_RAISE failed on non-inheritable cap\n");
281
282	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_RAW);
283	capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_NET_RAW);
284	capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_NET_RAW);
285	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
286	err(1, "capng_apply");
287	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_RAW, 0, 0, 0) != -1 \|\| errno != EPERM) {
288	printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have failed on a non-permitted cap\n");
289	return 1;
290	}
291	printf("[OK]\tPR_CAP_AMBIENT_RAISE failed on non-permitted cap\n");
292
293	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
294	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
295	err(1, "capng_apply");
296	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
297	printf("[FAIL]\tPR_CAP_AMBIENT_RAISE should have succeeded\n");
298	return 1;
299	}
300	printf("[OK]\tPR_CAP_AMBIENT_RAISE worked\n");
301
302	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 1) {
303	printf("[FAIL]\tPR_CAP_AMBIENT_IS_SET is broken\n");
304	return 1;
305	}
306
307	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0, 0, 0, 0) != 0)
308	err(1, "PR_CAP_AMBIENT_CLEAR_ALL");
309
310	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
311	printf("[FAIL]\tPR_CAP_AMBIENT_CLEAR_ALL didn't work\n");
312	return 1;
313	}
314
315	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
316	err(1, "PR_CAP_AMBIENT_RAISE");
317
318	capng_update(CAPNG_DROP, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
319	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
320	err(1, "capng_apply");
321
322	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0) {
323	printf("[FAIL]\tDropping I should have dropped A\n");
324	return 1;
325	}
326
327	printf("[OK]\tBasic manipulation appears to work\n");
328
329	capng_update(CAPNG_ADD, CAPNG_INHERITABLE, CAP_NET_BIND_SERVICE);
330	if (capng_apply(CAPNG_SELECT_CAPS) != 0)
331	err(1, "capng_apply");
332	if (uid == 0) {
333	printf("[RUN]\tRoot +i => eip\n");
334	if (fork_wait())
335	exec_validate_cap(true, true, true, false);
336	} else {
337	printf("[RUN]\tNon-root +i => i\n");
338	if (fork_wait())
339	exec_validate_cap(false, false, true, false);
340	}
341
342	if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_NET_BIND_SERVICE, 0, 0, 0) != 0)
343	err(1, "PR_CAP_AMBIENT_RAISE");
344
345	printf("[RUN]\tUID %d +ia => eipa\n", uid);
346	if (fork_wait())
347	exec_validate_cap(true, true, true, true);
348
349	/* The remaining tests need real privilege */
350
351	if (!have_outer_privilege) {
352	printf("[SKIP]\tSUID/SGID tests (needs privilege)\n");
353	goto done;
354	}
355
356	if (uid == 0) {
357	printf("[RUN]\tRoot +ia, suidroot => eipa\n");
358	if (fork_wait())
359	exec_other_validate_cap("./validate_cap_suidroot",
360	true, true, true, true);
361
362	printf("[RUN]\tRoot +ia, suidnonroot => ip\n");
363	if (fork_wait())
364	exec_other_validate_cap("./validate_cap_suidnonroot",
365	false, true, true, false);
366
367	printf("[RUN]\tRoot +ia, sgidroot => eipa\n");
368	if (fork_wait())
369	exec_other_validate_cap("./validate_cap_sgidroot",
370	true, true, true, true);
371
372	if (fork_wait()) {
373	printf("[RUN]\tRoot, gid != 0, +ia, sgidroot => eip\n");
374	if (setresgid(1, 1, 1) != 0)
375	err(1, "setresgid");
376	exec_other_validate_cap("./validate_cap_sgidroot",
377	true, true, true, false);
378	}
379
380	printf("[RUN]\tRoot +ia, sgidnonroot => eip\n");
381	if (fork_wait())
382	exec_other_validate_cap("./validate_cap_sgidnonroot",
383	true, true, true, false);
384	} else {
385	printf("[RUN]\tNon-root +ia, sgidnonroot => i\n");
386	exec_other_validate_cap("./validate_cap_sgidnonroot",
387	false, false, true, false);
388
389	if (fork_wait()) {
390	printf("[RUN]\tNon-root +ia, sgidroot => i\n");
391	if (setresgid(1, 1, 1) != 0)
392	err(1, "setresgid");
393	exec_other_validate_cap("./validate_cap_sgidroot",
394	false, false, true, false);
395	}
396	}
397
398	done:
399	return nerrs ? 1 : 0;
400	}
401
402	int main(int argc, char **argv)
403	{
404	char tmp1, tmp2, *our_path;
405
406	/* Find our path */
407	tmp1 = strdup(argv[0]);
408	if (!tmp1)
409	err(1, "strdup");
410	tmp2 = dirname(tmp1);
411	our_path = strdup(tmp2);
412	if (!our_path)
413	err(1, "strdup");
414	free(tmp1);
415
416	if (fork_wait()) {
417	printf("[RUN]\t+++ Tests with uid == 0 +++\n");
418	return do_tests(0, our_path);
419	}
420
421	if (fork_wait()) {
422	printf("[RUN]\t+++ Tests with uid != 0 +++\n");
423	return do_tests(1, our_path);
424	}
425
426	return nerrs ? 1 : 0;
427	}