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ftpd: Fix insecure chroot() handling

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Ensure that the rtems_libio_set_private_env() was successful before the
chroot().

Update #3530.
This commit is contained in:
Sebastian Huber
2018-10-05 15:16:46 +02:00
parent df97c4d25f
commit be8de0ff46
1 changed files with 9 additions and 8 deletions
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15
cpukit/ftpd/ftpd.c
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@@ -1879,12 +1879,7 @@ static void
session(rtems_task_argument arg)
{
FTPD_SessionInfo_t *const info = (FTPD_SessionInfo_t *)arg;
int chroot_made = 0;
rtems_libio_set_private_env();
/* chroot() can fail here because the directory may not exist yet. */
chroot_made = chroot(ftpd_root) == 0;
bool chroot_made = false;
while (1)
{
@@ -1894,8 +1889,14 @@ session(rtems_task_argument arg)
rtems_event_receive(FTPD_RTEMS_EVENT, RTEMS_EVENT_ANY, RTEMS_NO_TIMEOUT,
&set);
chroot_made = chroot_made || chroot(ftpd_root) == 0;
chroot_made = chroot_made
|| (rtems_libio_set_private_env() == RTEMS_SUCCESSFUL
&& chroot(ftpd_root) == 0);
/*
* The chdir() must immediatly follow the chroot(), otherwise static
* analysis tools may complain about a security issue.
*/
rv = chroot_made ? chdir("/") : -1;
errno = 0;