#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");} 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;}
#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");
}
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;
}