diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfsd/nfs4idmap.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfsd/nfs4idmap.c | 633 |
1 files changed, 0 insertions, 633 deletions
diff --git a/ANDROID_3.4.5/fs/nfsd/nfs4idmap.c b/ANDROID_3.4.5/fs/nfsd/nfs4idmap.c deleted file mode 100644 index 322d11ce..00000000 --- a/ANDROID_3.4.5/fs/nfsd/nfs4idmap.c +++ /dev/null @@ -1,633 +0,0 @@ -/* - * 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/seq_file.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <net/net_namespace.h> -#include "idmap.h" -#include "nfsd.h" - -/* - * Turn off idmapping when using AUTH_SYS. - */ -static bool nfs4_disable_idmapping = true; -module_param(nfs4_disable_idmapping, bool, 0644); -MODULE_PARM_DESC(nfs4_disable_idmapping, - "Turn off server's NFSv4 idmapping when using 'sec=sys'"); - -/* - * 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) - -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_upcall(struct cache_detail *cd, struct cache_head *ch) -{ - return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request); -} - -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, int has_died) -{ - printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", - has_died ? "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_upcall = idtoname_upcall, - .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, -}; - -static 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_upcall(struct cache_detail *cd, struct cache_head *ch) -{ - return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request); -} - -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_upcall = nametoid_upcall, - .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 - */ - -int -nfsd_idmap_init(void) -{ - int rv; - - rv = cache_register_net(&idtoname_cache, &init_net); - if (rv) - return rv; - rv = cache_register_net(&nametoid_cache, &init_net); - if (rv) - cache_unregister_net(&idtoname_cache, &init_net); - return rv; -} - -void -nfsd_idmap_shutdown(void) -{ - cache_unregister_net(&idtoname_cache, &init_net); - cache_unregister_net(&nametoid_cache, &init_net); -} - -static int -idmap_lookup(struct svc_rqst *rqstp, - struct ent *(*lookup_fn)(struct ent *), struct ent *key, - struct cache_detail *detail, struct ent **item) -{ - int ret; - - *item = lookup_fn(key); - if (!*item) - return -ENOMEM; - retry: - ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle); - - if (ret == -ETIMEDOUT) { - struct ent *prev_item = *item; - *item = lookup_fn(key); - if (*item != prev_item) - goto retry; - cache_put(&(*item)->h, detail); - } - 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 __be32 -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 nfserr_badowner; - 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) - return nfserr_badowner; - if (ret) - return nfserrno(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; -} - -static bool -numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, uid_t *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(name, 10, id); - return ret == 0; -} - -static __be32 -do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, uid_t *id) -{ - if (nfs4_disable_idmapping && rqstp->rq_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 int -do_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name) -{ - if (nfs4_disable_idmapping && rqstp->rq_flavor < RPC_AUTH_GSS) - return sprintf(name, "%u", id); - return idmap_id_to_name(rqstp, type, id, name); -} - -__be32 -nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, - __u32 *id) -{ - return do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id); -} - -__be32 -nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, - __u32 *id) -{ - return do_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 do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); -} - -int -nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) -{ - return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); -} |