diff options
Diffstat (limited to 'server/responder/nss/nsssrv_nc.c')
| -rw-r--r-- | server/responder/nss/nsssrv_nc.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/server/responder/nss/nsssrv_nc.c b/server/responder/nss/nsssrv_nc.c new file mode 100644 index 00000000..74f8369b --- /dev/null +++ b/server/responder/nss/nsssrv_nc.c @@ -0,0 +1,258 @@ +/* + SSSD + + NSS Responder + + Copyright (C) Simo Sorce <ssorce@redhat.com> 2008 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "util/util.h" +#include <fcntl.h> +#include <time.h> +#include "tdb.h" + +#define NC_USER_PREFIX "NCUSER" +#define NC_GROUP_PREFIX "NCGROUP" +#define NC_UID_PREFIX "NCUID" +#define NC_GID_PREFIX "NCGID" + +struct nss_nc_ctx { + struct tdb_context *tdb; +}; + +static int string_to_tdb_data(char *str, TDB_DATA *ret) +{ + if (!str || !ret) return EINVAL; + + ret->dptr = (uint8_t *)str; + ret->dsize = strlen(str)+1; + + return EOK; +} + +int nss_ncache_init(TALLOC_CTX *memctx, struct nss_nc_ctx **_ctx) +{ + struct nss_nc_ctx *ctx; + + ctx = talloc_zero(memctx, struct nss_nc_ctx); + if (!ctx) return ENOMEM; + + errno = 0; + /* open a memory only tdb with default hash size */ + ctx->tdb = tdb_open("memcache", 0, TDB_INTERNAL, O_RDWR|O_CREAT, 0); + if (!ctx->tdb) return errno; + + *_ctx = ctx; + return EOK; +}; + +static int nss_ncache_check_str(struct nss_nc_ctx *ctx, char *str, int ttl) +{ + TDB_DATA key; + TDB_DATA data; + unsigned long long int timestamp; + bool expired = false; + char *ep; + int ret; + + ret = string_to_tdb_data(str, &key); + if (ret != EOK) goto done; + + data = tdb_fetch(ctx->tdb, key); + + if (!data.dptr) { + ret = ENOENT; + goto done; + } + + errno = 0; + timestamp = strtoull((const char *)data.dptr, &ep, 0); + if (errno != 0 || *ep != '\0') { + /* Malformed entry, remove it and return no entry */ + expired = true; + goto done; + } + + if (timestamp + ttl > time(NULL)) { + /* still valid */ + ret = EEXIST; + goto done; + } + + expired = true; + +done: + if (expired) { + /* expired, remove and return no entry */ + tdb_delete(ctx->tdb, key); + ret = ENOENT; + } + + return ret; +} + +static int nss_ncache_set_str(struct nss_nc_ctx *ctx, char *str) +{ + TDB_DATA key; + TDB_DATA data; + char *timest; + int ret; + + ret = string_to_tdb_data(str, &key); + if (ret != EOK) return ret; + + timest = talloc_asprintf(ctx, "%llu", (unsigned long long int)time(NULL)); + if (!timest) return ENOMEM; + + ret = string_to_tdb_data(timest, &data); + if (ret != EOK) goto done; + + ret = tdb_store(ctx->tdb, key, data, TDB_REPLACE); + if (ret != 0) { + DEBUG(1, ("Negative cache failed to set entry: [%s]", + tdb_errorstr(ctx->tdb))); + ret = EFAULT; + } + +done: + talloc_free(timest); + return ret; +} + +int nss_ncache_check_user(struct nss_nc_ctx *ctx, int ttl, + const char *domain, const char *name) +{ + char *str; + int ret; + + if (!name || !*name) return EINVAL; + + str = talloc_asprintf(ctx, "%s/%s/%s", NC_USER_PREFIX, domain, name); + if (!str) return ENOMEM; + + ret = nss_ncache_check_str(ctx, str, ttl); + + talloc_free(str); + return ret; +} + +int nss_ncache_check_group(struct nss_nc_ctx *ctx, int ttl, + const char *domain, const char *name) +{ + char *str; + int ret; + + if (!name || !*name) return EINVAL; + + str = talloc_asprintf(ctx, "%s/%s/%s", NC_GROUP_PREFIX, domain, name); + if (!str) return ENOMEM; + + ret = nss_ncache_check_str(ctx, str, ttl); + + talloc_free(str); + return ret; +} + +int nss_ncache_check_uid(struct nss_nc_ctx *ctx, int ttl, uid_t uid) +{ + char *str; + int ret; + + str = talloc_asprintf(ctx, "%s/%u", NC_UID_PREFIX, uid); + if (!str) return ENOMEM; + + ret = nss_ncache_check_str(ctx, str, ttl); + + talloc_free(str); + return ret; +} + +int nss_ncache_check_gid(struct nss_nc_ctx *ctx, int ttl, gid_t gid) +{ + char *str; + int ret; + + str = talloc_asprintf(ctx, "%s/%u", NC_GID_PREFIX, gid); + if (!str) return ENOMEM; + + ret = nss_ncache_check_str(ctx, str, ttl); + + talloc_free(str); + return ret; +} + +int nss_ncache_set_user(struct nss_nc_ctx *ctx, + const char *domain, const char *name) +{ + char *str; + int ret; + + if (!name || !*name) return EINVAL; + + str = talloc_asprintf(ctx, "%s/%s/%s", NC_USER_PREFIX, domain, name); + if (!str) return ENOMEM; + + ret = nss_ncache_set_str(ctx, str); + + talloc_free(str); + return ret; +} + +int nss_ncache_set_group(struct nss_nc_ctx *ctx, + const char *domain, const char *name) +{ + char *str; + int ret; + + if (!name || !*name) return EINVAL; + + str = talloc_asprintf(ctx, "%s/%s/%s", NC_GROUP_PREFIX, domain, name); + if (!str) return ENOMEM; + + ret = nss_ncache_set_str(ctx, str); + + talloc_free(str); + return ret; +} + +int nss_ncache_set_uid(struct nss_nc_ctx *ctx, uid_t uid) +{ + char *str; + int ret; + + str = talloc_asprintf(ctx, "%s/%u", NC_UID_PREFIX, uid); + if (!str) return ENOMEM; + + ret = nss_ncache_set_str(ctx, str); + + talloc_free(str); + return ret; +} + +int nss_ncache_set_gid(struct nss_nc_ctx *ctx, gid_t gid) +{ + char *str; + int ret; + + str = talloc_asprintf(ctx, "%s/%u", NC_GID_PREFIX, gid); + if (!str) return ENOMEM; + + ret = nss_ncache_set_str(ctx, str); + + talloc_free(str); + return ret; +} + |