| /* |
| * 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 cache_detail *, struct ent *); |
| static struct ent *idtoname_update(struct cache_detail *, 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(cd, &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(cd, &ent, res); |
| if (res == NULL) |
| goto out; |
| |
| cache_put(&res->h, cd); |
| |
| error = 0; |
| out: |
| kfree(buf1); |
| |
| return error; |
| } |
| |
| |
| static struct ent * |
| idtoname_lookup(struct cache_detail *cd, struct ent *item) |
| { |
| struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, |
| idtoname_hash(item)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| static struct ent * |
| idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
| { |
| struct cache_head *ch = sunrpc_cache_update(cd, &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 cache_detail *, struct ent *); |
| static struct ent *nametoid_update(struct cache_detail *, 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(cd, &ent); |
| if (res == NULL) |
| goto out; |
| res = nametoid_update(cd, &ent, res); |
| if (res == NULL) |
| goto out; |
| |
| cache_put(&res->h, cd); |
| error = 0; |
| out: |
| kfree(buf1); |
| |
| return (error); |
| } |
| |
| |
| static struct ent * |
| nametoid_lookup(struct cache_detail *cd, struct ent *item) |
| { |
| struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, |
| nametoid_hash(item)); |
| if (ch) |
| return container_of(ch, struct ent, h); |
| else |
| return NULL; |
| } |
| |
| static struct ent * |
| nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
| { |
| struct cache_head *ch = sunrpc_cache_update(cd, &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 cache_detail *, struct ent *), |
| struct ent *key, struct cache_detail *detail, struct ent **item) |
| { |
| int ret; |
| |
| *item = lookup_fn(detail, 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(detail, 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); |
| } |