| /* |
| * fs/nfsd/nfs4idmap.c |
| * |
| * Mapping of UID/GIDs to name and vice versa. |
| * |
| * Copyright (c) 2002, 2003 The Regents of the University of |
| * Michigan. All rights reserved. |
| * |
| * Marius Aamodt Eriksen <marius@umich.edu> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| |
| #include <linux/mm.h> |
| #include <linux/utsname.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/nfs.h> |
| #include <linux/nfs4.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_page.h> |
| #include <linux/sunrpc/cache.h> |
| #include <linux/nfsd_idmap.h> |
| #include <linux/list.h> |
| #include <linux/time.h> |
| #include <linux/seq_file.h> |
| #include <linux/sunrpc/svcauth.h> |
| |
| /* |
| * Cache entry |
| */ |
| |
| /* |
| * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on |
| * that. |
| */ |
| |
| #define IDMAP_TYPE_USER 0 |
| #define IDMAP_TYPE_GROUP 1 |
| |
| struct ent { |
| struct cache_head h; |
| int type; /* User / Group */ |
| uid_t id; |
| char name[IDMAP_NAMESZ]; |
| char authname[IDMAP_NAMESZ]; |
| }; |
| |
| /* Common entry handling */ |
| |
| #define ENT_HASHBITS 8 |
| #define ENT_HASHMAX (1 << ENT_HASHBITS) |
| #define ENT_HASHMASK (ENT_HASHMAX - 1) |
| |
| static void |
| ent_init(struct cache_head *cnew, struct cache_head *citm) |
| { |
| struct ent *new = container_of(cnew, struct ent, h); |
| struct ent *itm = container_of(citm, struct ent, h); |
| |
| new->id = itm->id; |
| new->type = itm->type; |
| |
| strlcpy(new->name, itm->name, sizeof(new->name)); |
| strlcpy(new->authname, itm->authname, sizeof(new->name)); |
| } |
| |
| static void |
| ent_put(struct kref *ref) |
| { |
| struct ent *map = container_of(ref, struct ent, h.ref); |
| kfree(map); |
| } |
| |
| static struct cache_head * |
| ent_alloc(void) |
| { |
| struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); |
| if (e) |
| return &e->h; |
| else |
| return NULL; |
| } |
| |
| /* |
| * ID -> Name cache |
| */ |
| |
| static struct cache_head *idtoname_table[ENT_HASHMAX]; |
| |
| static uint32_t |
| idtoname_hash(struct ent *ent) |
| { |
| uint32_t hash; |
| |
| hash = hash_str(ent->authname, ENT_HASHBITS); |
| hash = hash_long(hash ^ ent->id, ENT_HASHBITS); |
| |
| /* Flip LSB for user/group */ |
| if (ent->type == IDMAP_TYPE_GROUP) |
| hash ^= 1; |
| |
| return hash; |
| } |
| |
| static void |
| idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
| int *blen) |
| { |
| struct ent *ent = container_of(ch, struct ent, h); |
| char idstr[11]; |
| |
| qword_add(bpp, blen, ent->authname); |
| snprintf(idstr, sizeof(idstr), "%u", ent->id); |
| qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
| qword_add(bpp, blen, idstr); |
| |
| (*bpp)[-1] = '\n'; |
| } |
| |
| static int |
| idtoname_match(struct cache_head *ca, struct cache_head *cb) |
| { |
| struct ent *a = container_of(ca, struct ent, h); |
| struct ent *b = container_of(cb, struct ent, h); |
| |
| return (a->id == b->id && a->type == b->type && |
| strcmp(a->authname, b->authname) == 0); |
| } |
| |
| static int |
| idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) |
| { |
| struct ent *ent; |
| |
| if (h == NULL) { |
| seq_puts(m, "#domain type id [name]\n"); |
| return 0; |
| } |
| ent = container_of(h, struct ent, h); |
| seq_printf(m, "%s %s %u", ent->authname, |
| ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
| ent->id); |
| if (test_bit(CACHE_VALID, &h->flags)) |
| seq_printf(m, " %s", ent->name); |
| seq_printf(m, "\n"); |
| return 0; |
| } |
| |
| static void |
| warn_no_idmapd(struct cache_detail *detail) |
| { |
| printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", |
| detail->last_close? "died" : "not been started"); |
| } |
| |
| |
| static int idtoname_parse(struct cache_detail *, char *, int); |
| static struct ent *idtoname_lookup(struct ent *); |
| static struct ent *idtoname_update(struct ent *, struct ent *); |
| |
| static struct cache_detail idtoname_cache = { |
| .owner = THIS_MODULE, |
| .hash_size = ENT_HASHMAX, |
| .hash_table = idtoname_table, |
| .name = "nfs4.idtoname", |
| .cache_put = ent_put, |
| .cache_request = idtoname_request, |
| .cache_parse = idtoname_parse, |
| .cache_show = idtoname_show, |
| .warn_no_listener = warn_no_idmapd, |
| .match = idtoname_match, |
| .init = ent_init, |
| .update = ent_init, |
| .alloc = ent_alloc, |
| }; |
| |
| int |
| idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
| { |
| struct ent ent, *res; |
| char *buf1, *bp; |
| int len; |
| int error = -EINVAL; |
| |
| if (buf[buflen - 1] != '\n') |
| return (-EINVAL); |
| buf[buflen - 1]= '\0'; |
| |
| buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| if (buf1 == NULL) |
| return (-ENOMEM); |
| |
| memset(&ent, 0, sizeof(ent)); |
| |
| /* Authentication name */ |
| if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
| goto out; |
| memcpy(ent.authname, buf1, sizeof(ent.authname)); |
| |
| /* Type */ |
| if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
| goto out; |
| ent.type = strcmp(buf1, "user") == 0 ? |
| IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; |
| |
| /* ID */ |
| if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
| goto out; |
| ent.id = simple_strtoul(buf1, &bp, 10); |
| if (bp == buf1) |
| goto out; |
| |
| /* expiry */ |
| ent.h.expiry_time = get_expiry(&buf); |
| if (ent.h.expiry_time == 0) |
| goto out; |
| |
| error = -ENOMEM; |
| res = idtoname_lookup(&ent); |
| if (!res) |
| goto out; |
| |
| /* Name */ |
| error = -EINVAL; |
| len = qword_get(&buf, buf1, PAGE_SIZE); |
| if (len < 0) |
| goto out; |
| if (len == 0) |
| set_bit(CACHE_NEGATIVE, &ent.h.flags); |
| else if (len >= IDMAP_NAMESZ) |
| goto out; |
| else |
| memcpy(ent.name, buf1, sizeof(ent.name)); |
| error = -ENOMEM; |
| res = idtoname_update(&ent, res); |
| if (res == NULL) |
| goto out; |
| |
| cache_put(&res->h, &idtoname_cache); |
| |
| error = 0; |
| out: |
| kfree(buf1); |
| |
| return error; |
| } |
| |
| |
| static struct ent * |
| idtoname_lookup(struct ent *item) |
| { |
| struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache, |
| &item->h, |
| idtoname_hash(item)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| static struct ent * |
| idtoname_update(struct ent *new, struct ent *old) |
| { |
| struct cache_head *ch = sunrpc_cache_update(&idtoname_cache, |
| &new->h, &old->h, |
| idtoname_hash(new)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| |
| /* |
| * Name -> ID cache |
| */ |
| |
| static struct cache_head *nametoid_table[ENT_HASHMAX]; |
| |
| static inline int |
| nametoid_hash(struct ent *ent) |
| { |
| return hash_str(ent->name, ENT_HASHBITS); |
| } |
| |
| static void |
| nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
| int *blen) |
| { |
| struct ent *ent = container_of(ch, struct ent, h); |
| |
| qword_add(bpp, blen, ent->authname); |
| qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
| qword_add(bpp, blen, ent->name); |
| |
| (*bpp)[-1] = '\n'; |
| } |
| |
| static int |
| nametoid_match(struct cache_head *ca, struct cache_head *cb) |
| { |
| struct ent *a = container_of(ca, struct ent, h); |
| struct ent *b = container_of(cb, struct ent, h); |
| |
| return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
| strcmp(a->authname, b->authname) == 0); |
| } |
| |
| static int |
| nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) |
| { |
| struct ent *ent; |
| |
| if (h == NULL) { |
| seq_puts(m, "#domain type name [id]\n"); |
| return 0; |
| } |
| ent = container_of(h, struct ent, h); |
| seq_printf(m, "%s %s %s", ent->authname, |
| ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
| ent->name); |
| if (test_bit(CACHE_VALID, &h->flags)) |
| seq_printf(m, " %u", ent->id); |
| seq_printf(m, "\n"); |
| return 0; |
| } |
| |
| static struct ent *nametoid_lookup(struct ent *); |
| static struct ent *nametoid_update(struct ent *, struct ent *); |
| static int nametoid_parse(struct cache_detail *, char *, int); |
| |
| static struct cache_detail nametoid_cache = { |
| .owner = THIS_MODULE, |
| .hash_size = ENT_HASHMAX, |
| .hash_table = nametoid_table, |
| .name = "nfs4.nametoid", |
| .cache_put = ent_put, |
| .cache_request = nametoid_request, |
| .cache_parse = nametoid_parse, |
| .cache_show = nametoid_show, |
| .warn_no_listener = warn_no_idmapd, |
| .match = nametoid_match, |
| .init = ent_init, |
| .update = ent_init, |
| .alloc = ent_alloc, |
| }; |
| |
| static int |
| nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
| { |
| struct ent ent, *res; |
| char *buf1; |
| int error = -EINVAL; |
| |
| if (buf[buflen - 1] != '\n') |
| return (-EINVAL); |
| buf[buflen - 1]= '\0'; |
| |
| buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| if (buf1 == NULL) |
| return (-ENOMEM); |
| |
| memset(&ent, 0, sizeof(ent)); |
| |
| /* Authentication name */ |
| if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
| goto out; |
| memcpy(ent.authname, buf1, sizeof(ent.authname)); |
| |
| /* Type */ |
| if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) |
| goto out; |
| ent.type = strcmp(buf1, "user") == 0 ? |
| IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; |
| |
| /* Name */ |
| error = qword_get(&buf, buf1, PAGE_SIZE); |
| if (error <= 0 || error >= IDMAP_NAMESZ) |
| goto out; |
| memcpy(ent.name, buf1, sizeof(ent.name)); |
| |
| /* expiry */ |
| ent.h.expiry_time = get_expiry(&buf); |
| if (ent.h.expiry_time == 0) |
| goto out; |
| |
| /* ID */ |
| error = get_int(&buf, &ent.id); |
| if (error == -EINVAL) |
| goto out; |
| if (error == -ENOENT) |
| set_bit(CACHE_NEGATIVE, &ent.h.flags); |
| |
| error = -ENOMEM; |
| res = nametoid_lookup(&ent); |
| if (res == NULL) |
| goto out; |
| res = nametoid_update(&ent, res); |
| if (res == NULL) |
| goto out; |
| |
| cache_put(&res->h, &nametoid_cache); |
| error = 0; |
| out: |
| kfree(buf1); |
| |
| return (error); |
| } |
| |
| |
| static struct ent * |
| nametoid_lookup(struct ent *item) |
| { |
| struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache, |
| &item->h, |
| nametoid_hash(item)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| static struct ent * |
| nametoid_update(struct ent *new, struct ent *old) |
| { |
| struct cache_head *ch = sunrpc_cache_update(&nametoid_cache, |
| &new->h, &old->h, |
| nametoid_hash(new)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| /* |
| * Exported API |
| */ |
| |
| void |
| nfsd_idmap_init(void) |
| { |
| cache_register(&idtoname_cache); |
| cache_register(&nametoid_cache); |
| } |
| |
| void |
| nfsd_idmap_shutdown(void) |
| { |
| cache_unregister(&idtoname_cache); |
| cache_unregister(&nametoid_cache); |
| } |
| |
| /* |
| * Deferred request handling |
| */ |
| |
| struct idmap_defer_req { |
| struct cache_req req; |
| struct cache_deferred_req deferred_req; |
| wait_queue_head_t waitq; |
| atomic_t count; |
| }; |
| |
| static inline void |
| put_mdr(struct idmap_defer_req *mdr) |
| { |
| if (atomic_dec_and_test(&mdr->count)) |
| kfree(mdr); |
| } |
| |
| static inline void |
| get_mdr(struct idmap_defer_req *mdr) |
| { |
| atomic_inc(&mdr->count); |
| } |
| |
| static void |
| idmap_revisit(struct cache_deferred_req *dreq, int toomany) |
| { |
| struct idmap_defer_req *mdr = |
| container_of(dreq, struct idmap_defer_req, deferred_req); |
| |
| wake_up(&mdr->waitq); |
| put_mdr(mdr); |
| } |
| |
| static struct cache_deferred_req * |
| idmap_defer(struct cache_req *req) |
| { |
| struct idmap_defer_req *mdr = |
| container_of(req, struct idmap_defer_req, req); |
| |
| mdr->deferred_req.revisit = idmap_revisit; |
| get_mdr(mdr); |
| return (&mdr->deferred_req); |
| } |
| |
| static inline int |
| do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
| struct cache_detail *detail, struct ent **item, |
| struct idmap_defer_req *mdr) |
| { |
| *item = lookup_fn(key); |
| if (!*item) |
| return -ENOMEM; |
| return cache_check(detail, &(*item)->h, &mdr->req); |
| } |
| |
| static inline int |
| do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *), |
| struct ent *key, struct cache_detail *detail, |
| struct ent **item) |
| { |
| int ret = -ENOMEM; |
| |
| *item = lookup_fn(key); |
| if (!*item) |
| goto out_err; |
| ret = -ETIMEDOUT; |
| if (!test_bit(CACHE_VALID, &(*item)->h.flags) |
| || (*item)->h.expiry_time < get_seconds() |
| || detail->flush_time > (*item)->h.last_refresh) |
| goto out_put; |
| ret = -ENOENT; |
| if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags)) |
| goto out_put; |
| return 0; |
| out_put: |
| cache_put(&(*item)->h, detail); |
| out_err: |
| *item = NULL; |
| return ret; |
| } |
| |
| static int |
| idmap_lookup(struct svc_rqst *rqstp, |
| struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
| struct cache_detail *detail, struct ent **item) |
| { |
| struct idmap_defer_req *mdr; |
| int ret; |
| |
| mdr = kzalloc(sizeof(*mdr), GFP_KERNEL); |
| if (!mdr) |
| return -ENOMEM; |
| atomic_set(&mdr->count, 1); |
| init_waitqueue_head(&mdr->waitq); |
| mdr->req.defer = idmap_defer; |
| ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr); |
| if (ret == -EAGAIN) { |
| wait_event_interruptible_timeout(mdr->waitq, |
| test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ); |
| ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item); |
| } |
| put_mdr(mdr); |
| return ret; |
| } |
| |
| static char * |
| rqst_authname(struct svc_rqst *rqstp) |
| { |
| struct auth_domain *clp; |
| |
| clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client; |
| return clp->name; |
| } |
| |
| static int |
| idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, |
| uid_t *id) |
| { |
| struct ent *item, key = { |
| .type = type, |
| }; |
| int ret; |
| |
| if (namelen + 1 > sizeof(key.name)) |
| return -EINVAL; |
| memcpy(key.name, name, namelen); |
| key.name[namelen] = '\0'; |
| strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
| ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item); |
| if (ret == -ENOENT) |
| ret = -ESRCH; /* nfserr_badname */ |
| if (ret) |
| return ret; |
| *id = item->id; |
| cache_put(&item->h, &nametoid_cache); |
| return 0; |
| } |
| |
| static int |
| idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name) |
| { |
| struct ent *item, key = { |
| .id = id, |
| .type = type, |
| }; |
| int ret; |
| |
| strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
| ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item); |
| if (ret == -ENOENT) |
| return sprintf(name, "%u", id); |
| if (ret) |
| return ret; |
| ret = strlen(item->name); |
| BUG_ON(ret > IDMAP_NAMESZ); |
| memcpy(name, item->name, ret); |
| cache_put(&item->h, &idtoname_cache); |
| return ret; |
| } |
| |
| int |
| nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
| __u32 *id) |
| { |
| return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id); |
| } |
| |
| int |
| nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
| __u32 *id) |
| { |
| return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id); |
| } |
| |
| int |
| nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) |
| { |
| return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); |
| } |
| |
| int |
| nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) |
| { |
| return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); |
| } |