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test-peersec.c
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test-peersec.c
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/*
* Verify SO_PEERSEC on SELinux
*
* This test queries SO_PEERSEC on AF_UNIX+SOCK_STREAM sockets. It first runs
* socketpair(2) and queries it, then runs an emulated socketpair(2) and
* queries it.
*
* XXX: For now, the test simply prints the data. However, ultimately, we want
* to use this as verification that the kernel is fixed to return the same
* data on both. This is still open for discussion, though.
*/
#undef NDEBUG
#include <c-stdaux.h>
#include <stdlib.h>
#include <sys/auxv.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <time.h>
#include "util/sockopt.h"
static int socketpair_fallback(int domain, int type, int protocol, int sv[2]) {
_c_cleanup_(c_closep) int listener = -1, client_a = -1, client_b = -1;
uint64_t magic = UINT64_C(0x6ff780fe02a8a310); /* pseudo-random seed */
struct sockaddr_un address;
int type_flags;
int r;
type_flags = type & (SOCK_NONBLOCK | SOCK_CLOEXEC);
type &= ~type_flags;
if (domain != AF_UNIX)
return -EAFNOSUPPORT;
if (type != SOCK_STREAM && type != SOCK_SEQPACKET)
return -EOPNOTSUPP;
/* create listener and connecting client */
{
listener = socket(AF_UNIX, type | SOCK_CLOEXEC, protocol);
if (listener < 0)
return -errno;
client_a = socket(AF_UNIX, type | type_flags, protocol);
if (client_a < 0)
return -errno;
}
/* get some random data */
{
const uint8_t *at_random;
struct timespec ts;
/* if no other random source works, use our stack address */
magic ^= (unsigned long)&magic;
/* AT_RANDOM contains 128bits of randomness from kernel */
at_random = (const uint8_t *)getauxval(AT_RANDOM);
if (at_random) {
magic ^= at_random[0];
magic ^= at_random[1];
magic ^= at_random[2];
magic ^= at_random[3];
}
/* merge in the current time */
r = clock_gettime(CLOCK_MONOTONIC, &ts);
if (!r) {
magic ^= ts.tv_sec;
magic ^= ts.tv_nsec;
}
}
/* bind our listener to a random address */
{
address = (struct sockaddr_un){
.sun_family = AF_UNIX,
.sun_path = { },
};
sprintf(address.sun_path + 1, "%"PRIx64, magic);
r = bind(listener, (struct sockaddr *)&address, sizeof(address));
if (r)
return -errno;
r = listen(listener, 1);
if (r)
return -errno;
}
/* connect @client_a to @listener */
{
r = connect(client_a, (struct sockaddr *)&address, sizeof(address));
if (r)
return -errno;
client_b = accept4(listener, NULL, NULL, type_flags);
if (client_b < 0)
return -errno;
}
sv[0] = client_a;
sv[1] = client_b;
client_a = -1;
client_b = -1;
return 0;
}
static void test_peersec(void) {
char buffer[4096];
int r, sv[2];
/* test socketpair(2) */
{
_c_cleanup_(c_closep) int a = -1, b = -1;
_c_cleanup_(c_freep) char *label_a = NULL, *label_b = NULL;
size_t n_label_a, n_label_b;
r = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv);
c_assert(!r);
a = sv[0];
b = sv[1];
r = write(a, "foobar", 6);
c_assert(r == 6);
r = read(b, buffer, sizeof(buffer));
c_assert(r == 6);
c_assert(!memcmp(buffer, "foobar", 6));
r = sockopt_get_peersec(a, &label_a, &n_label_a);
c_assert(!r);
r = sockopt_get_peersec(b, &label_b, &n_label_b);
c_assert(!r);
fprintf(stdout, "A: socketpair(2): %zu '%s'\n", n_label_a, label_a);
fprintf(stdout, "B: socketpair(2): %zu '%s'\n", n_label_b, label_b);
}
/* test socketpair_fallback(2) */
{
_c_cleanup_(c_closep) int a = -1, b = -1;
_c_cleanup_(c_freep) char *label_a = NULL, *label_b = NULL;
size_t n_label_a, n_label_b;
r = socketpair_fallback(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv);
c_assert(!r);
a = sv[0];
b = sv[1];
r = write(a, "foobar", 6);
c_assert(r == 6);
r = read(b, buffer, sizeof(buffer));
c_assert(r == 6);
c_assert(!memcmp(buffer, "foobar", 6));
r = sockopt_get_peersec(a, &label_a, &n_label_a);
c_assert(!r);
r = sockopt_get_peersec(b, &label_b, &n_label_b);
c_assert(!r);
fprintf(stdout, "A: socketpair_fallback(2): %zu '%s'\n", n_label_a, label_a);
fprintf(stdout, "B: socketpair_fallback(2): %zu '%s'\n", n_label_b, label_b);
}
}
int main(int argc, char **argv) {
test_peersec();
return 0;
}