int ptlrpc_user_desc_do_idmap(struct ptlrpc_request *req,
struct ptlrpc_user_desc *pud)
{
struct mdt_export_data *med = mdt_req2med(req);
struct lustre_idmap_table *idmap = med->med_idmap;
uid_t uid, fsuid;
gid_t gid, fsgid;
/* Only remote client need desc_to_idmap. */
if (!exp_connect_rmtclient(req->rq_export))
return 0;
uid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_uid);
if (uid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "no mapping for uid %u\n", pud->pud_uid);
return -EACCES;
}
if (pud->pud_uid == pud->pud_fsuid) {
fsuid = uid;
} else {
fsuid = lustre_idmap_lookup_uid(NULL, idmap, 0, pud->pud_fsuid);
if (fsuid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "no mapping for fsuid %u\n",
pud->pud_fsuid);
return -EACCES;
}
}
gid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_gid);
if (gid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "no mapping for gid %u\n", pud->pud_gid);
return -EACCES;
}
if (pud->pud_gid == pud->pud_fsgid) {
fsgid = gid;
} else {
fsgid = lustre_idmap_lookup_gid(NULL, idmap, 0, pud->pud_fsgid);
if (fsgid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "no mapping for fsgid %u\n",
pud->pud_fsgid);
return -EACCES;
}
}
pud->pud_uid = uid;
pud->pud_gid = gid;
pud->pud_fsuid = fsuid;
pud->pud_fsgid = fsgid;
return 0;
}
/* Do not ignore root_squash for non-setattr case. */
int mdt_fix_attr_ucred(struct mdt_thread_info *info, __u32 op)
{
struct ptlrpc_request *req = mdt_info_req(info);
struct md_ucred *uc = mdt_ucred(info);
struct lu_attr *attr = &info->mti_attr.ma_attr;
struct mdt_export_data *med = mdt_req2med(req);
struct lustre_idmap_table *idmap = med->med_idmap;
if ((uc->mu_valid != UCRED_OLD) && (uc->mu_valid != UCRED_NEW))
return -EINVAL;
if (op != REINT_SETATTR) {
if ((attr->la_valid & LA_UID) && (attr->la_uid != -1))
attr->la_uid = uc->mu_fsuid;
/* for S_ISGID, inherit gid from his parent, such work will be
* done in cmm/mdd layer, here set all cases as uc->mu_fsgid. */
if ((attr->la_valid & LA_GID) && (attr->la_gid != -1))
attr->la_gid = uc->mu_fsgid;
} else if (exp_connect_rmtclient(info->mti_exp)) {
/* NB: -1 case will be handled by mdt_fix_attr() later. */
if ((attr->la_valid & LA_UID) && (attr->la_uid != -1)) {
uid_t uid = lustre_idmap_lookup_uid(uc, idmap, 0,
attr->la_uid);
if (uid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "Deny chown to uid %u\n",
attr->la_uid);
return -EPERM;
}
attr->la_uid = uid;
}
if ((attr->la_valid & LA_GID) && (attr->la_gid != -1)) {
gid_t gid = lustre_idmap_lookup_gid(uc, idmap, 0,
attr->la_gid);
if (gid == CFS_IDMAP_NOTFOUND) {
CDEBUG(D_SEC, "Deny chown to gid %u\n",
attr->la_gid);
return -EPERM;
}
attr->la_gid = gid;
}
}
return 0;
}
/*
* Reverse mapping
*/
void mdt_body_reverse_idmap(struct mdt_thread_info *info, struct mdt_body *body)
{
struct ptlrpc_request *req = mdt_info_req(info);
struct lu_ucred *uc = mdt_ucred(info);
struct mdt_export_data *med = mdt_req2med(req);
struct lustre_idmap_table *idmap = med->med_idmap;
if (!exp_connect_rmtclient(info->mti_exp))
return;
if (body->mbo_valid & OBD_MD_FLUID) {
uid_t uid;
uid = lustre_idmap_lookup_uid(uc, idmap, 1, body->mbo_uid);
if (uid == CFS_IDMAP_NOTFOUND) {
uid = NOBODY_UID;
if (body->mbo_valid & OBD_MD_FLMODE)
body->mbo_mode = (body->mbo_mode & ~S_IRWXU) |
((body->mbo_mode & S_IRWXO) << 6);
}
body->mbo_uid = uid;
}
if (body->mbo_valid & OBD_MD_FLGID) {
gid_t gid;
gid = lustre_idmap_lookup_gid(uc, idmap, 1, body->mbo_gid);
if (gid == CFS_IDMAP_NOTFOUND) {
gid = NOBODY_GID;
if (body->mbo_valid & OBD_MD_FLMODE)
body->mbo_mode = (body->mbo_mode & ~S_IRWXG) |
((body->mbo_mode & S_IRWXO) << 3);
}
body->mbo_gid = gid;
}
}