NSS_GETPW_PROTOTYPES(mymachines);
NSS_GETGR_PROTOTYPES(mymachines);
+#define HOST_UID_LIMIT ((uid_t) UINT32_C(0x10000))
+#define HOST_GID_LIMIT ((gid_t) UINT32_C(0x10000))
+
static int count_addresses(sd_bus_message *m, int af, unsigned *ret) {
unsigned c = 0;
int r;
if (r < 0)
goto fail;
+ /* Refuse to work if the mapped address is in the host UID range, or if there was no mapping at all. */
+ if (mapped < HOST_UID_LIMIT || mapped == uid)
+ goto not_found;
+
l = strlen(name);
if (buflen < l+1) {
*errnop = ENOMEM;
}
/* We consider all uids < 65536 host uids */
- if (uid < 0x10000)
+ if (uid < HOST_UID_LIMIT)
goto not_found;
r = sd_bus_open_system(&bus);
if (r < 0)
goto fail;
+ if (mapped == uid)
+ goto not_found;
+
if (snprintf(buffer, buflen, "vu-%s-" UID_FMT, machine, (uid_t) mapped) >= (int) buflen) {
*errnop = ENOMEM;
return NSS_STATUS_TRYAGAIN;
if (r < 0)
goto fail;
+ if (mapped < HOST_GID_LIMIT || mapped == gid)
+ goto not_found;
+
l = sizeof(char*) + strlen(name) + 1;
if (buflen < l) {
*errnop = ENOMEM;
}
/* We consider all gids < 65536 host gids */
- if (gid < 0x10000)
+ if (gid < HOST_GID_LIMIT)
goto not_found;
r = sd_bus_open_system(&bus);
if (r < 0)
goto fail;
+ if (mapped == gid)
+ goto not_found;
+
if (buflen < sizeof(char*) + 1) {
*errnop = ENOMEM;
return NSS_STATUS_TRYAGAIN;