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686 lines
17 KiB
686 lines
17 KiB
/* |
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* Mapping of UID/GIDs to name and vice versa. |
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* |
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* Copyright (c) 2002, 2003 The Regents of the University of |
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* Michigan. All rights reserved. |
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* |
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* Marius Aamodt Eriksen <[email protected]> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/seq_file.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/sunrpc/svc_xprt.h> |
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#include <net/net_namespace.h> |
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#include "idmap.h" |
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#include "nfsd.h" |
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#include "netns.h" |
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|
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/* |
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* Turn off idmapping when using AUTH_SYS. |
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*/ |
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static bool nfs4_disable_idmapping = true; |
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module_param(nfs4_disable_idmapping, bool, 0644); |
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MODULE_PARM_DESC(nfs4_disable_idmapping, |
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"Turn off server's NFSv4 idmapping when using 'sec=sys'"); |
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|
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/* |
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* Cache entry |
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*/ |
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|
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/* |
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* XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on |
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* that. |
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*/ |
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|
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struct ent { |
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struct cache_head h; |
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int type; /* User / Group */ |
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u32 id; |
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char name[IDMAP_NAMESZ]; |
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char authname[IDMAP_NAMESZ]; |
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struct rcu_head rcu_head; |
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}; |
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|
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/* Common entry handling */ |
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|
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#define ENT_HASHBITS 8 |
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#define ENT_HASHMAX (1 << ENT_HASHBITS) |
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|
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static void |
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ent_init(struct cache_head *cnew, struct cache_head *citm) |
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{ |
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struct ent *new = container_of(cnew, struct ent, h); |
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struct ent *itm = container_of(citm, struct ent, h); |
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|
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new->id = itm->id; |
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new->type = itm->type; |
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|
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strlcpy(new->name, itm->name, sizeof(new->name)); |
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strlcpy(new->authname, itm->authname, sizeof(new->authname)); |
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} |
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|
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static void |
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ent_put(struct kref *ref) |
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{ |
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struct ent *map = container_of(ref, struct ent, h.ref); |
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kfree_rcu(map, rcu_head); |
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} |
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|
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static struct cache_head * |
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ent_alloc(void) |
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{ |
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struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); |
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if (e) |
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return &e->h; |
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else |
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return NULL; |
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} |
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|
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/* |
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* ID -> Name cache |
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*/ |
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|
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static uint32_t |
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idtoname_hash(struct ent *ent) |
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{ |
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uint32_t hash; |
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|
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hash = hash_str(ent->authname, ENT_HASHBITS); |
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hash = hash_long(hash ^ ent->id, ENT_HASHBITS); |
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|
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/* Flip LSB for user/group */ |
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if (ent->type == IDMAP_TYPE_GROUP) |
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hash ^= 1; |
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|
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return hash; |
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} |
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|
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static int |
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idtoname_upcall(struct cache_detail *cd, struct cache_head *h) |
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{ |
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return sunrpc_cache_pipe_upcall_timeout(cd, h); |
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} |
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|
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static void |
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idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
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int *blen) |
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{ |
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struct ent *ent = container_of(ch, struct ent, h); |
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char idstr[11]; |
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|
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qword_add(bpp, blen, ent->authname); |
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snprintf(idstr, sizeof(idstr), "%u", ent->id); |
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
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qword_add(bpp, blen, idstr); |
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|
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(*bpp)[-1] = '\n'; |
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} |
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|
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static int |
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idtoname_match(struct cache_head *ca, struct cache_head *cb) |
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{ |
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struct ent *a = container_of(ca, struct ent, h); |
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struct ent *b = container_of(cb, struct ent, h); |
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|
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return (a->id == b->id && a->type == b->type && |
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strcmp(a->authname, b->authname) == 0); |
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} |
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|
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static int |
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idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) |
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{ |
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struct ent *ent; |
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|
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if (h == NULL) { |
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seq_puts(m, "#domain type id [name]\n"); |
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return 0; |
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} |
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ent = container_of(h, struct ent, h); |
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seq_printf(m, "%s %s %u", ent->authname, |
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
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ent->id); |
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if (test_bit(CACHE_VALID, &h->flags)) |
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seq_printf(m, " %s", ent->name); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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|
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static void |
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warn_no_idmapd(struct cache_detail *detail, int has_died) |
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{ |
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printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", |
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has_died ? "died" : "not been started"); |
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} |
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static int idtoname_parse(struct cache_detail *, char *, int); |
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static struct ent *idtoname_lookup(struct cache_detail *, struct ent *); |
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static struct ent *idtoname_update(struct cache_detail *, struct ent *, |
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struct ent *); |
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|
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static const struct cache_detail idtoname_cache_template = { |
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.owner = THIS_MODULE, |
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.hash_size = ENT_HASHMAX, |
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.name = "nfs4.idtoname", |
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.cache_put = ent_put, |
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.cache_upcall = idtoname_upcall, |
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.cache_request = idtoname_request, |
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.cache_parse = idtoname_parse, |
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.cache_show = idtoname_show, |
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.warn_no_listener = warn_no_idmapd, |
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.match = idtoname_match, |
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.init = ent_init, |
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.update = ent_init, |
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.alloc = ent_alloc, |
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}; |
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|
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static int |
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idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
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{ |
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struct ent ent, *res; |
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char *buf1, *bp; |
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int len; |
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int error = -EINVAL; |
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|
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if (buf[buflen - 1] != '\n') |
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return (-EINVAL); |
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buf[buflen - 1]= '\0'; |
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|
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (buf1 == NULL) |
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return (-ENOMEM); |
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|
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memset(&ent, 0, sizeof(ent)); |
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|
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/* Authentication name */ |
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len = qword_get(&buf, buf1, PAGE_SIZE); |
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if (len <= 0 || len >= IDMAP_NAMESZ) |
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goto out; |
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memcpy(ent.authname, buf1, sizeof(ent.authname)); |
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|
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/* Type */ |
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
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goto out; |
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ent.type = strcmp(buf1, "user") == 0 ? |
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; |
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|
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/* ID */ |
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
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goto out; |
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ent.id = simple_strtoul(buf1, &bp, 10); |
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if (bp == buf1) |
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goto out; |
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|
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/* expiry */ |
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ent.h.expiry_time = get_expiry(&buf); |
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if (ent.h.expiry_time == 0) |
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goto out; |
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error = -ENOMEM; |
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res = idtoname_lookup(cd, &ent); |
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if (!res) |
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goto out; |
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|
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/* Name */ |
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error = -EINVAL; |
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len = qword_get(&buf, buf1, PAGE_SIZE); |
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if (len < 0 || len >= IDMAP_NAMESZ) |
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goto out; |
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if (len == 0) |
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set_bit(CACHE_NEGATIVE, &ent.h.flags); |
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else |
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memcpy(ent.name, buf1, sizeof(ent.name)); |
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error = -ENOMEM; |
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res = idtoname_update(cd, &ent, res); |
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if (res == NULL) |
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goto out; |
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cache_put(&res->h, cd); |
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error = 0; |
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out: |
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kfree(buf1); |
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return error; |
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} |
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|
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static struct ent * |
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idtoname_lookup(struct cache_detail *cd, struct ent *item) |
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{ |
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struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h, |
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idtoname_hash(item)); |
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if (ch) |
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return container_of(ch, struct ent, h); |
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else |
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return NULL; |
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} |
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|
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static struct ent * |
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idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
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{ |
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struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
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idtoname_hash(new)); |
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if (ch) |
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return container_of(ch, struct ent, h); |
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else |
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return NULL; |
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} |
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/* |
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* Name -> ID cache |
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*/ |
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|
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static inline int |
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nametoid_hash(struct ent *ent) |
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{ |
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return hash_str(ent->name, ENT_HASHBITS); |
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} |
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|
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static int |
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nametoid_upcall(struct cache_detail *cd, struct cache_head *h) |
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{ |
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return sunrpc_cache_pipe_upcall_timeout(cd, h); |
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} |
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|
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static void |
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nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
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int *blen) |
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{ |
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struct ent *ent = container_of(ch, struct ent, h); |
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|
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qword_add(bpp, blen, ent->authname); |
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qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
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qword_add(bpp, blen, ent->name); |
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|
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(*bpp)[-1] = '\n'; |
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} |
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|
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static int |
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nametoid_match(struct cache_head *ca, struct cache_head *cb) |
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{ |
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struct ent *a = container_of(ca, struct ent, h); |
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struct ent *b = container_of(cb, struct ent, h); |
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|
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return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
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strcmp(a->authname, b->authname) == 0); |
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} |
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|
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static int |
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nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) |
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{ |
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struct ent *ent; |
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|
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if (h == NULL) { |
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seq_puts(m, "#domain type name [id]\n"); |
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return 0; |
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} |
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ent = container_of(h, struct ent, h); |
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seq_printf(m, "%s %s %s", ent->authname, |
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ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
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ent->name); |
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if (test_bit(CACHE_VALID, &h->flags)) |
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seq_printf(m, " %u", ent->id); |
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seq_putc(m, '\n'); |
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return 0; |
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} |
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|
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static struct ent *nametoid_lookup(struct cache_detail *, struct ent *); |
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static struct ent *nametoid_update(struct cache_detail *, struct ent *, |
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struct ent *); |
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static int nametoid_parse(struct cache_detail *, char *, int); |
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|
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static const struct cache_detail nametoid_cache_template = { |
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.owner = THIS_MODULE, |
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.hash_size = ENT_HASHMAX, |
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.name = "nfs4.nametoid", |
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.cache_put = ent_put, |
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.cache_upcall = nametoid_upcall, |
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.cache_request = nametoid_request, |
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.cache_parse = nametoid_parse, |
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.cache_show = nametoid_show, |
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.warn_no_listener = warn_no_idmapd, |
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.match = nametoid_match, |
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.init = ent_init, |
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.update = ent_init, |
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.alloc = ent_alloc, |
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}; |
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|
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static int |
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nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
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{ |
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struct ent ent, *res; |
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char *buf1; |
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int len, error = -EINVAL; |
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|
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if (buf[buflen - 1] != '\n') |
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return (-EINVAL); |
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buf[buflen - 1]= '\0'; |
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|
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buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (buf1 == NULL) |
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return (-ENOMEM); |
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|
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memset(&ent, 0, sizeof(ent)); |
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|
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/* Authentication name */ |
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len = qword_get(&buf, buf1, PAGE_SIZE); |
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if (len <= 0 || len >= IDMAP_NAMESZ) |
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goto out; |
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memcpy(ent.authname, buf1, sizeof(ent.authname)); |
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|
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/* Type */ |
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if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
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goto out; |
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ent.type = strcmp(buf1, "user") == 0 ? |
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IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; |
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|
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/* Name */ |
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len = qword_get(&buf, buf1, PAGE_SIZE); |
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if (len <= 0 || len >= IDMAP_NAMESZ) |
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goto out; |
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memcpy(ent.name, buf1, sizeof(ent.name)); |
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|
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/* expiry */ |
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ent.h.expiry_time = get_expiry(&buf); |
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if (ent.h.expiry_time == 0) |
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goto out; |
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|
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/* ID */ |
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error = get_int(&buf, &ent.id); |
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if (error == -EINVAL) |
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goto out; |
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if (error == -ENOENT) |
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set_bit(CACHE_NEGATIVE, &ent.h.flags); |
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|
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error = -ENOMEM; |
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res = nametoid_lookup(cd, &ent); |
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if (res == NULL) |
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goto out; |
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res = nametoid_update(cd, &ent, res); |
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if (res == NULL) |
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goto out; |
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|
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cache_put(&res->h, cd); |
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error = 0; |
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out: |
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kfree(buf1); |
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return (error); |
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} |
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|
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static struct ent * |
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nametoid_lookup(struct cache_detail *cd, struct ent *item) |
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{ |
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struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h, |
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nametoid_hash(item)); |
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if (ch) |
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return container_of(ch, struct ent, h); |
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else |
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return NULL; |
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} |
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|
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static struct ent * |
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nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
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{ |
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struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
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nametoid_hash(new)); |
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if (ch) |
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return container_of(ch, struct ent, h); |
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else |
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return NULL; |
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} |
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|
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/* |
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* Exported API |
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*/ |
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|
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int |
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nfsd_idmap_init(struct net *net) |
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{ |
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int rv; |
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struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
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nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net); |
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if (IS_ERR(nn->idtoname_cache)) |
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return PTR_ERR(nn->idtoname_cache); |
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rv = cache_register_net(nn->idtoname_cache, net); |
|
if (rv) |
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goto destroy_idtoname_cache; |
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nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net); |
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if (IS_ERR(nn->nametoid_cache)) { |
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rv = PTR_ERR(nn->nametoid_cache); |
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goto unregister_idtoname_cache; |
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} |
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rv = cache_register_net(nn->nametoid_cache, net); |
|
if (rv) |
|
goto destroy_nametoid_cache; |
|
return 0; |
|
|
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destroy_nametoid_cache: |
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cache_destroy_net(nn->nametoid_cache, net); |
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unregister_idtoname_cache: |
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cache_unregister_net(nn->idtoname_cache, net); |
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destroy_idtoname_cache: |
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cache_destroy_net(nn->idtoname_cache, net); |
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return rv; |
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} |
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|
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void |
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nfsd_idmap_shutdown(struct net *net) |
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{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
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cache_unregister_net(nn->idtoname_cache, net); |
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cache_unregister_net(nn->nametoid_cache, net); |
|
cache_destroy_net(nn->idtoname_cache, net); |
|
cache_destroy_net(nn->nametoid_cache, net); |
|
} |
|
|
|
static int |
|
idmap_lookup(struct svc_rqst *rqstp, |
|
struct ent *(*lookup_fn)(struct cache_detail *, struct ent *), |
|
struct ent *key, struct cache_detail *detail, struct ent **item) |
|
{ |
|
int ret; |
|
|
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*item = lookup_fn(detail, key); |
|
if (!*item) |
|
return -ENOMEM; |
|
retry: |
|
ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle); |
|
|
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if (ret == -ETIMEDOUT) { |
|
struct ent *prev_item = *item; |
|
*item = lookup_fn(detail, key); |
|
if (*item != prev_item) |
|
goto retry; |
|
cache_put(&(*item)->h, detail); |
|
} |
|
return ret; |
|
} |
|
|
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static char * |
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rqst_authname(struct svc_rqst *rqstp) |
|
{ |
|
struct auth_domain *clp; |
|
|
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clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client; |
|
return clp->name; |
|
} |
|
|
|
static __be32 |
|
idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, |
|
u32 *id) |
|
{ |
|
struct ent *item, key = { |
|
.type = type, |
|
}; |
|
int ret; |
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
|
|
|
if (namelen + 1 > sizeof(key.name)) |
|
return nfserr_badowner; |
|
memcpy(key.name, name, namelen); |
|
key.name[namelen] = '\0'; |
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
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ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item); |
|
if (ret == -ENOENT) |
|
return nfserr_badowner; |
|
if (ret) |
|
return nfserrno(ret); |
|
*id = item->id; |
|
cache_put(&item->h, nn->nametoid_cache); |
|
return 0; |
|
} |
|
|
|
static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id) |
|
{ |
|
char buf[11]; |
|
int len; |
|
__be32 *p; |
|
|
|
len = sprintf(buf, "%u", id); |
|
p = xdr_reserve_space(xdr, len + 4); |
|
if (!p) |
|
return nfserr_resource; |
|
p = xdr_encode_opaque(p, buf, len); |
|
return 0; |
|
} |
|
|
|
static __be32 idmap_id_to_name(struct xdr_stream *xdr, |
|
struct svc_rqst *rqstp, int type, u32 id) |
|
{ |
|
struct ent *item, key = { |
|
.id = id, |
|
.type = type, |
|
}; |
|
__be32 *p; |
|
int ret; |
|
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
|
|
|
strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
|
ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item); |
|
if (ret == -ENOENT) |
|
return encode_ascii_id(xdr, id); |
|
if (ret) |
|
return nfserrno(ret); |
|
ret = strlen(item->name); |
|
WARN_ON_ONCE(ret > IDMAP_NAMESZ); |
|
p = xdr_reserve_space(xdr, ret + 4); |
|
if (!p) |
|
return nfserr_resource; |
|
p = xdr_encode_opaque(p, item->name, ret); |
|
cache_put(&item->h, nn->idtoname_cache); |
|
return 0; |
|
} |
|
|
|
static bool |
|
numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
|
{ |
|
int ret; |
|
char buf[11]; |
|
|
|
if (namelen + 1 > sizeof(buf)) |
|
/* too long to represent a 32-bit id: */ |
|
return false; |
|
/* Just to make sure it's null-terminated: */ |
|
memcpy(buf, name, namelen); |
|
buf[namelen] = '\0'; |
|
ret = kstrtouint(buf, 10, id); |
|
return ret == 0; |
|
} |
|
|
|
static __be32 |
|
do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
|
{ |
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
|
if (numeric_name_to_id(rqstp, type, name, namelen, id)) |
|
return 0; |
|
/* |
|
* otherwise, fall through and try idmapping, for |
|
* backwards compatibility with clients sending names: |
|
*/ |
|
return idmap_name_to_id(rqstp, type, name, namelen, id); |
|
} |
|
|
|
static __be32 encode_name_from_id(struct xdr_stream *xdr, |
|
struct svc_rqst *rqstp, int type, u32 id) |
|
{ |
|
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
|
return encode_ascii_id(xdr, id); |
|
return idmap_id_to_name(xdr, rqstp, type, id); |
|
} |
|
|
|
__be32 |
|
nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
|
kuid_t *uid) |
|
{ |
|
__be32 status; |
|
u32 id = -1; |
|
|
|
if (name == NULL || namelen == 0) |
|
return nfserr_inval; |
|
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id); |
|
*uid = make_kuid(nfsd_user_namespace(rqstp), id); |
|
if (!uid_valid(*uid)) |
|
status = nfserr_badowner; |
|
return status; |
|
} |
|
|
|
__be32 |
|
nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
|
kgid_t *gid) |
|
{ |
|
__be32 status; |
|
u32 id = -1; |
|
|
|
if (name == NULL || namelen == 0) |
|
return nfserr_inval; |
|
|
|
status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id); |
|
*gid = make_kgid(nfsd_user_namespace(rqstp), id); |
|
if (!gid_valid(*gid)) |
|
status = nfserr_badowner; |
|
return status; |
|
} |
|
|
|
__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp, |
|
kuid_t uid) |
|
{ |
|
u32 id = from_kuid_munged(nfsd_user_namespace(rqstp), uid); |
|
return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id); |
|
} |
|
|
|
__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp, |
|
kgid_t gid) |
|
{ |
|
u32 id = from_kgid_munged(nfsd_user_namespace(rqstp), gid); |
|
return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id); |
|
}
|
|
|