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/* SPDX-License-Identifier: MIT */
/*
* Description: test if personalities work
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
#define FNAME "/tmp/.tmp.access"
#define USE_UID 1000
static int no_personality;
static int open_file(struct io_uring *ring, int cred_id, int with_link)
{
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
int ret, i, to_submit = 1;
if (with_link) {
sqe = io_uring_get_sqe(ring);
io_uring_prep_nop(sqe);
sqe->flags |= IOSQE_IO_LINK;
sqe->user_data = 1;
to_submit++;
}
sqe = io_uring_get_sqe(ring);
io_uring_prep_openat(sqe, -1, FNAME, O_RDONLY, 0);
sqe->user_data = 2;
if (cred_id != -1)
sqe->personality = cred_id;
ret = io_uring_submit(ring);
if (ret != to_submit) {
fprintf(stderr, "submit got: %d\n", ret);
goto err;
}
for (i = 0; i < to_submit; i++) {
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
goto err;
}
ret = cqe->res;
io_uring_cqe_seen(ring, cqe);
}
err:
return ret;
}
static int test_personality(struct io_uring *ring)
{
int ret, cred_id;
ret = io_uring_register_personality(ring);
if (ret < 0) {
if (ret == -EINVAL) {
fprintf(stdout, "Personalities not supported, skipping\n");
no_personality = 1;
goto out;
}
fprintf(stderr, "register_personality: %d\n", ret);
goto err;
}
cred_id = ret;
/* create file only owner can open */
ret = open(FNAME, O_RDONLY | O_CREAT, 0600);
if (ret < 0) {
perror("open");
goto err;
}
close(ret);
/* verify we can open it */
ret = open_file(ring, -1, 0);
if (ret < 0) {
fprintf(stderr, "current open got: %d\n", ret);
goto err;
}
if (seteuid(USE_UID) < 0) {
fprintf(stdout, "Can't switch to UID %u, skipping\n", USE_UID);
goto out;
}
/* verify we can't open it with current credentials */
ret = open_file(ring, -1, 0);
if (ret != -EACCES) {
fprintf(stderr, "open got: %d\n", ret);
goto err;
}
/* verify we can open with registered credentials */
ret = open_file(ring, cred_id, 0);
if (ret < 0) {
fprintf(stderr, "credential open: %d\n", ret);
goto err;
}
close(ret);
/* verify we can open with registered credentials and as a link */
ret = open_file(ring, cred_id, 1);
if (ret < 0) {
fprintf(stderr, "credential open: %d\n", ret);
goto err;
}
if (seteuid(0))
perror("seteuid");
ret = io_uring_unregister_personality(ring, cred_id);
if (ret) {
fprintf(stderr, "register_personality: %d\n", ret);
goto err;
}
out:
unlink(FNAME);
return 0;
err:
unlink(FNAME);
return 1;
}
static int test_invalid_personality(struct io_uring *ring)
{
int ret;
ret = open_file(ring, 2, 0);
if (ret != -EINVAL) {
fprintf(stderr, "invalid personality got: %d\n", ret);
goto err;
}
return 0;
err:
return 1;
}
static int test_invalid_unregister(struct io_uring *ring)
{
int ret;
ret = io_uring_unregister_personality(ring, 2);
if (ret != -EINVAL) {
fprintf(stderr, "invalid personality unregister got: %d\n", ret);
goto err;
}
return 0;
err:
return 1;
}
int main(int argc, char *argv[])
{
struct io_uring ring;
int ret;
if (argc > 1)
return 0;
if (geteuid()) {
fprintf(stderr, "Not root, skipping\n");
return 0;
}
ret = io_uring_queue_init(8, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
ret = test_personality(&ring);
if (ret) {
fprintf(stderr, "test_personality failed\n");
return ret;
}
if (no_personality)
return 0;
ret = test_invalid_personality(&ring);
if (ret) {
fprintf(stderr, "test_invalid_personality failed\n");
return ret;
}
ret = test_invalid_unregister(&ring);
if (ret) {
fprintf(stderr, "test_invalid_unregister failed\n");
return ret;
}
return 0;
}
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