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fs/nfsd/nfs4idmap.c
13.2 KB
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/* |
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* 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. */ |
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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 "idmap.h" |
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#include "nfsd.h" |
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/* * 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]; }; |
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/* Common entry handling */ #define ENT_HASHBITS 8 #define ENT_HASHMAX (1 << ENT_HASHBITS) |
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|
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static void 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); struct ent *itm = container_of(citm, struct ent, h); |
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new->id = itm->id; new->type = itm->type; strlcpy(new->name, itm->name, sizeof(new->name)); strlcpy(new->authname, itm->authname, sizeof(new->name)); } |
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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); kfree(map); |
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} |
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static struct cache_head * ent_alloc(void) { struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); if (e) return &e->h; else return NULL; } |
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/* * 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); |
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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"); qword_add(bpp, blen, idstr); (*bpp)[-1] = ' '; } |
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static int |
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idtoname_upcall(struct cache_detail *cd, struct cache_head *ch) { return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request); } 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); struct ent *b = container_of(cb, struct ent, h); |
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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] "); return 0; } 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", ent->id); if (test_bit(CACHE_VALID, &h->flags)) seq_printf(m, " %s", ent->name); seq_printf(m, " "); return 0; } static void |
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warn_no_idmapd(struct cache_detail *detail, int has_died) |
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{ printk("nfsd: nfsv4 idmapping failing: has idmapd %s? ", |
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has_died ? "died" : "not been started"); |
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} static int idtoname_parse(struct cache_detail *, char *, int); |
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static struct ent *idtoname_lookup(struct ent *); static struct ent *idtoname_update(struct ent *, struct ent *); |
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|
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static struct cache_detail idtoname_cache = { |
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.owner = THIS_MODULE, |
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.hash_size = ENT_HASHMAX, .hash_table = idtoname_table, .name = "nfs4.idtoname", .cache_put = ent_put, |
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.cache_upcall = idtoname_upcall, |
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.cache_parse = idtoname_parse, .cache_show = idtoname_show, .warn_no_listener = warn_no_idmapd, |
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.match = idtoname_match, .init = ent_init, .update = ent_init, .alloc = ent_alloc, |
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}; |
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static int |
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idtoname_parse(struct cache_detail *cd, char *buf, int buflen) { struct ent ent, *res; char *buf1, *bp; |
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int len; |
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int error = -EINVAL; if (buf[buflen - 1] != ' ') 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; |
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error = -ENOMEM; res = idtoname_lookup(&ent); if (!res) goto out; |
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/* Name */ |
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error = -EINVAL; len = qword_get(&buf, buf1, PAGE_SIZE); if (len < 0) |
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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 if (len >= IDMAP_NAMESZ) goto out; 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(&ent, res); if (res == NULL) |
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goto out; |
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cache_put(&res->h, &idtoname_cache); |
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error = 0; out: kfree(buf1); return error; } |
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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; } |
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/* * 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); } |
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static void |
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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] = ' '; } |
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static int |
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nametoid_upcall(struct cache_detail *cd, struct cache_head *ch) { return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request); } 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); struct ent *b = container_of(cb, struct ent, h); |
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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] "); 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)) |
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seq_printf(m, " %u", ent->id); |
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seq_printf(m, " "); return 0; } |
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static struct ent *nametoid_lookup(struct ent *); static struct ent *nametoid_update(struct ent *, struct ent *); |
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static int nametoid_parse(struct cache_detail *, char *, int); |
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|
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static struct cache_detail nametoid_cache = { |
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.owner = THIS_MODULE, |
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.hash_size = ENT_HASHMAX, .hash_table = nametoid_table, .name = "nfs4.nametoid", .cache_put = ent_put, |
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.cache_upcall = nametoid_upcall, |
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.cache_parse = nametoid_parse, .cache_show = nametoid_show, .warn_no_listener = warn_no_idmapd, |
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.match = nametoid_match, .init = ent_init, .update = ent_init, .alloc = ent_alloc, |
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}; |
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static int |
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nametoid_parse(struct cache_detail *cd, char *buf, int buflen) { struct ent ent, *res; char *buf1; int error = -EINVAL; if (buf[buflen - 1] != ' ') 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; |
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res = nametoid_lookup(&ent); if (res == NULL) goto out; res = nametoid_update(&ent, res); if (res == NULL) |
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goto out; |
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cache_put(&res->h, &nametoid_cache); |
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error = 0; out: kfree(buf1); return (error); } |
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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; } |
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/* * Exported API */ |
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int |
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nfsd_idmap_init(void) { |
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int rv; rv = cache_register(&idtoname_cache); if (rv) return rv; rv = cache_register(&nametoid_cache); if (rv) cache_unregister(&idtoname_cache); return rv; |
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} void nfsd_idmap_shutdown(void) { |
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cache_unregister(&idtoname_cache); cache_unregister(&nametoid_cache); |
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} |
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static int idmap_lookup(struct svc_rqst *rqstp, |
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struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
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struct cache_detail *detail, struct ent **item) { |
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int ret; |
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*item = lookup_fn(key); if (!*item) |
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return -ENOMEM; |
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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); |
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} |
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return ret; } |
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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; } |
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static __be32 |
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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)) |
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return nfserr_badowner; |
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memcpy(key.name, name, namelen); key.name[namelen] = '\0'; |
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strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
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ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item); if (ret == -ENOENT) |
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return nfserr_badowner; |
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if (ret) |
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return nfserrno(ret); |
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*id = item->id; |
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cache_put(&item->h, &nametoid_cache); |
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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; |
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strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
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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); |
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cache_put(&item->h, &idtoname_cache); |
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return ret; } |
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__be32 |
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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); } |
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__be32 |
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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); } |