/* * Unix SMB/CIFS implementation. * * group mapping code on top of ldb * * Copyright (C) Andrew Tridgell 2006 * * based on tdb group mapping code from groupdb/mapping.c * * 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 2 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, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #include "groupdb/mapping.h" #include "lib/ldb/include/includes.h" #include "lib/ldb/include/ldb_errors.h" static struct ldb_context *ldb; static BOOL mapping_upgrade(const char *tdb_path); /* connect to the group mapping ldb */ BOOL init_group_mapping(void) { BOOL existed; const char *init_ldif[] = { "dn: @ATTRIBUTES\n" \ "ntName: CASE_INSENSITIVE\n" \ "\n", "dn: @INDEXLIST\n" \ "@IDXATTR: gidNumber\n" \ "@IDXATTR: ntName\n" \ "@IDXATTR: member\n" }; const char *db_path, *tdb_path; int ret; int flags = 0; if (ldb != NULL) { return True; } /* this is needed as Samba3 doesn't have this globally yet */ ldb_global_init(); db_path = lock_path("group_mapping.ldb"); ldb = ldb_init(NULL); if (ldb == NULL) goto failed; existed = file_exist(db_path, NULL); if (lp_parm_bool(-1, "groupmap", "nosync", False)) { flags |= LDB_FLG_NOSYNC; } ret = ldb_connect(ldb, db_path, flags, NULL); if (ret != LDB_SUCCESS) { goto failed; } if (!existed) { /* initialise the ldb with an index */ struct ldb_ldif *ldif; int i; for (i=0;i<ARRAY_SIZE(init_ldif);i++) { ldif = ldb_ldif_read_string(ldb, &init_ldif[i]); if (ldif == NULL) goto failed; ret = ldb_add(ldb, ldif->msg); talloc_free(ldif); if (ret == -1) goto failed; } } /* possibly upgrade */ tdb_path = lock_path("group_mapping.tdb"); if (file_exist(tdb_path, NULL) && !mapping_upgrade(tdb_path)) { unlink(lock_path("group_mapping.ldb")); goto failed; } return True; failed: DEBUG(0,("Failed to open group mapping ldb '%s' - '%s'\n", db_path, ldb?ldb_errstring(ldb):strerror(errno))); talloc_free(ldb); ldb = NULL; return False; } /* form the DN for a mapping entry from a SID */ static struct ldb_dn *mapping_dn(TALLOC_CTX *mem_ctx, const DOM_SID *sid) { fstring string_sid; uint32_t rid; DOM_SID domsid; sid_copy(&domsid, sid); if (!sid_split_rid(&domsid, &rid)) { return NULL; } if (!sid_to_string(string_sid, &domsid)) { return NULL; } /* we split by domain and rid so we can do a subtree search when we only want one domain */ return ldb_dn_string_compose(mem_ctx, NULL, "rid=%u,domain=%s", rid, string_sid); } /* add a group mapping entry */ BOOL add_mapping_entry(GROUP_MAP *map, int flag) { struct ldb_message *msg; int ret, i; fstring string_sid; if (!init_group_mapping()) { return False; } msg = ldb_msg_new(ldb); if (msg == NULL) { return False; } msg->dn = mapping_dn(msg, &map->sid); if (msg->dn == NULL) { goto failed; } if (ldb_msg_add_string(msg, "objectClass", "groupMap") != LDB_SUCCESS || ldb_msg_add_string(msg, "sid", sid_to_string(string_sid, &map->sid)) != LDB_SUCCESS || ldb_msg_add_fmt(msg, "gidNumber", "%u", (unsigned)map->gid) != LDB_SUCCESS || ldb_msg_add_fmt(msg, "sidNameUse", "%u", (unsigned)map->sid_name_use) != LDB_SUCCESS || ldb_msg_add_string(msg, "comment", map->comment) != LDB_SUCCESS || ldb_msg_add_string(msg, "ntName", map->nt_name) != LDB_SUCCESS) { goto failed; } ret = ldb_add(ldb, msg); /* if it exists we update it. This is a hangover from the semantics the tdb backend had */ if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) { for (i=0;i<msg->num_elements;i++) { msg->elements[i].flags = LDB_FLAG_MOD_REPLACE; } ret = ldb_modify(ldb, msg); } talloc_free(msg); return ret == LDB_SUCCESS; failed: talloc_free(msg); return False; } /* unpack a ldb message into a GROUP_MAP structure */ static BOOL msg_to_group_map(struct ldb_message *msg, GROUP_MAP *map) { const char *sidstr; map->gid = ldb_msg_find_attr_as_int(msg, "gidNumber", -1); map->sid_name_use = ldb_msg_find_attr_as_int(msg, "sidNameUse", -1); fstrcpy(map->nt_name, ldb_msg_find_attr_as_string(msg, "ntName", NULL)); fstrcpy(map->comment, ldb_msg_find_attr_as_string(msg, "comment", NULL)); sidstr = ldb_msg_find_attr_as_string(msg, "sid", NULL); if (!string_to_sid(&map->sid, sidstr) || map->gid == (gid_t)-1 || map->sid_name_use == (enum lsa_SidType)-1) { DEBUG(0,("Unable to unpack group mapping\n")); return False; } return True; } /* return a group map entry for a given sid */ BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map) { int ret; struct ldb_dn *dn; struct ldb_result *res=NULL; if (!init_group_mapping()) { return False; } dn = mapping_dn(ldb, &sid); if (dn == NULL) goto failed; ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res); talloc_steal(dn, res); if (ret != LDB_SUCCESS || res->count != 1) { goto failed; } if (!msg_to_group_map(res->msgs[0], map)) goto failed; talloc_free(dn); return True; failed: talloc_free(dn); return False; } /* return a group map entry for a given gid */ BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map) { int ret; char *expr; struct ldb_result *res=NULL; if (!init_group_mapping()) { return False; } expr = talloc_asprintf(ldb, "(&(gidNumber=%u)(objectClass=groupMap))", (unsigned)gid); if (expr == NULL) goto failed; ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res); talloc_steal(expr, res); if (ret != LDB_SUCCESS || res->count != 1) goto failed; if (!msg_to_group_map(res->msgs[0], map)) goto failed; talloc_free(expr); return True; failed: talloc_free(expr); return False; } /* Return the sid and the type of the unix group. */ BOOL get_group_map_from_ntname(const char *name, GROUP_MAP *map) { int ret; char *expr; struct ldb_result *res=NULL; if (!init_group_mapping()) { return False; } expr = talloc_asprintf(ldb, "(&(ntName=%s)(objectClass=groupMap))", name); if (expr == NULL) goto failed; ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res); talloc_steal(expr, res); if (ret != LDB_SUCCESS || res->count != 1) goto failed; if (!msg_to_group_map(res->msgs[0], map)) goto failed; talloc_free(expr); return True; failed: talloc_free(expr); return False; } /* Remove a group mapping entry. */ BOOL group_map_remove(const DOM_SID *sid) { struct ldb_dn *dn; int ret; if (!init_group_mapping()) { return False; } dn = mapping_dn(ldb, sid); if (dn == NULL) { return False; } ret = ldb_delete(ldb, dn); talloc_free(dn); return ret == LDB_SUCCESS; } /* Enumerate the group mappings for a domain */ BOOL enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use, GROUP_MAP **pp_rmap, size_t *p_num_entries, BOOL unix_only) { int i, ret; char *expr; fstring name; struct ldb_result *res; struct ldb_dn *basedn=NULL; TALLOC_CTX *tmp_ctx; if (!init_group_mapping()) { return False; } tmp_ctx = talloc_new(ldb); if (tmp_ctx == NULL) goto failed; if (sid_name_use == SID_NAME_UNKNOWN) { expr = talloc_asprintf(tmp_ctx, "(&(objectClass=groupMap))"); } else { expr = talloc_asprintf(tmp_ctx, "(&(sidNameUse=%u)(objectClass=groupMap))", sid_name_use); } if (expr == NULL) goto failed; /* we do a subtree search on the domain */ if (domsid != NULL) { sid_to_string(name, domsid); basedn = ldb_dn_string_compose(tmp_ctx, NULL, "domain=%s", name); if (basedn == NULL) goto failed; } ret = ldb_search(ldb, basedn, LDB_SCOPE_SUBTREE, expr, NULL, &res); if (ret != LDB_SUCCESS) goto failed; (*pp_rmap) = NULL; *p_num_entries = 0; for (i=0;i<res->count;i++) { (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP, (*p_num_entries)+1); if (!(*pp_rmap)) goto failed; if (!msg_to_group_map(res->msgs[i], &(*pp_rmap)[*p_num_entries])) { goto failed; } (*p_num_entries)++; } talloc_free(tmp_ctx); return True; failed: talloc_free(tmp_ctx); return False; } /* This operation happens on session setup, so it should better be fast. We store a list of aliases a SID is member of hanging off MEMBEROF/SID. */ NTSTATUS one_alias_membership(const DOM_SID *member, DOM_SID **sids, size_t *num) { const char *attrs[] = { "sid", NULL }; DOM_SID alias; char *expr; int ret, i; struct ldb_result *res=NULL; fstring string_sid; NTSTATUS status = NT_STATUS_INTERNAL_DB_CORRUPTION; if (!init_group_mapping()) { return NT_STATUS_ACCESS_DENIED; } if (!sid_to_string(string_sid, member)) { return NT_STATUS_INVALID_PARAMETER; } expr = talloc_asprintf(ldb, "(&(member=%s)(objectClass=groupMap))", string_sid); if (expr == NULL) goto failed; ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, attrs, &res); talloc_steal(expr, res); if (ret != LDB_SUCCESS) { goto failed; } for (i=0;i<res->count;i++) { struct ldb_message_element *el; el = ldb_msg_find_element(res->msgs[i], "sid"); if (el == NULL || el->num_values != 1) { status = NT_STATUS_INTERNAL_DB_CORRUPTION; goto failed; } string_to_sid(&alias, (char *)el->values[0].data); if (!add_sid_to_array_unique(NULL, &alias, sids, num)) { status = NT_STATUS_NO_MEMORY; goto failed; } } talloc_free(expr); return NT_STATUS_OK; failed: talloc_free(expr); return status; } /* add/remove a member field */ static NTSTATUS modify_aliasmem(const DOM_SID *alias, const DOM_SID *member, int operation) { fstring string_sid; int ret; struct ldb_message msg; struct ldb_message_element el; struct ldb_val val; TALLOC_CTX *tmp_ctx; GROUP_MAP map; if (!init_group_mapping()) { return NT_STATUS_ACCESS_DENIED; } if (!get_group_map_from_sid(*alias, &map)) { sid_to_string(string_sid, alias); return NT_STATUS_NO_SUCH_ALIAS; } if ((map.sid_name_use != SID_NAME_ALIAS) && (map.sid_name_use != SID_NAME_WKN_GRP)) { DEBUG(0,("sid_name_use=%d\n", map.sid_name_use)); return NT_STATUS_NO_SUCH_ALIAS; } tmp_ctx = talloc_new(NULL); if (tmp_ctx == NULL) { return NT_STATUS_NO_MEMORY; } msg.dn = mapping_dn(tmp_ctx, alias); if (msg.dn == NULL) { return NT_STATUS_NO_MEMORY; } msg.num_elements = 1; msg.elements = ⪙ el.flags = operation; el.name = talloc_strdup(tmp_ctx, "member"); el.num_values = 1; el.values = &val; sid_to_string(string_sid, member); val.data = (uint8_t *)string_sid; val.length = strlen(string_sid); ret = ldb_modify(ldb, &msg); talloc_free(tmp_ctx); if (ret == LDB_ERR_NO_SUCH_OBJECT) { return NT_STATUS_NO_SUCH_ALIAS; } if (operation == LDB_FLAG_MOD_ADD && ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) { return NT_STATUS_MEMBER_IN_ALIAS; } return (ret == LDB_SUCCESS ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED); } NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member) { return modify_aliasmem(alias, member, LDB_FLAG_MOD_ADD); } NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member) { return modify_aliasmem(alias, member, LDB_FLAG_MOD_DELETE); } /* enumerate sids that have the given alias set in member */ NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num) { const char *attrs[] = { "member", NULL }; int ret, i; struct ldb_result *res=NULL; struct ldb_dn *dn; struct ldb_message_element *el; if (!init_group_mapping()) { return NT_STATUS_ACCESS_DENIED; } *sids = NULL; *num = 0; dn = mapping_dn(ldb, alias); if (dn == NULL) { return NT_STATUS_NO_MEMORY; } ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, attrs, &res); talloc_steal(dn, res); if (ret == LDB_SUCCESS && res->count == 0) { talloc_free(dn); return NT_STATUS_OK; } if (ret != LDB_SUCCESS) { talloc_free(dn); return NT_STATUS_INTERNAL_DB_CORRUPTION; } el = ldb_msg_find_element(res->msgs[0], "member"); if (el == NULL) { talloc_free(dn); return NT_STATUS_INTERNAL_DB_CORRUPTION; } for (i=0;i<el->num_values;i++) { DOM_SID sid; string_to_sid(&sid, (const char *)el->values[i].data); if (!add_sid_to_array_unique(NULL, &sid, sids, num)) { talloc_free(dn); return NT_STATUS_NO_MEMORY; } } talloc_free(dn); return NT_STATUS_OK; } /* upgrade one group mapping record from the old tdb format */ static int upgrade_map_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key, TDB_DATA data, void *state) { int ret; GROUP_MAP map; if (strncmp(key.dptr, GROUP_PREFIX, MIN(key.dsize, strlen(GROUP_PREFIX))) != 0) { return 0; } if (!string_to_sid(&map.sid, strlen(GROUP_PREFIX) + (const char *)key.dptr)) { DEBUG(0,("Bad sid key '%s' during upgrade\n", (const char *)key.dptr)); *(int *)state = -1; return -1; } ret = tdb_unpack(data.dptr, data.dsize, "ddff", &map.gid, &map.sid_name_use, &map.nt_name, &map.comment); if (ret == -1) { DEBUG(0,("Failed to unpack group map record during upgrade\n")); *(int *)state = -1; return -1; } if (!add_mapping_entry(&map, 0)) { DEBUG(0,("Failed to add mapping entry during upgrade\n")); *(int *)state = -1; return -1; } return 0; } /* upgrade one alias record from the old tdb format */ static int upgrade_alias_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key, TDB_DATA data, void *state) { const char *p = data.dptr; fstring string_sid; DOM_SID member; if (strncmp(key.dptr, MEMBEROF_PREFIX, MIN(key.dsize, strlen(MEMBEROF_PREFIX))) != 0) { return 0; } if (!string_to_sid(&member, strlen(MEMBEROF_PREFIX) + (const char *)key.dptr)) { DEBUG(0,("Bad alias key %s during upgrade\n", (const char *)key.dptr)); *(int *)state = -1; } while (next_token(&p, string_sid, " ", sizeof(string_sid))) { DOM_SID alias; NTSTATUS status; string_to_sid(&alias, string_sid); status = add_aliasmem(&alias, &member); if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_ALIAS)) { DEBUG(0,("Ignoring orphaned alias record '%s'\n", string_sid)); } else if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("Failed to add alias member during upgrade - %s\n", nt_errstr(status))); *(int *)state = -1; return -1; } } return 0; } /* upgrade from a old style tdb */ static BOOL mapping_upgrade(const char *tdb_path) { static TDB_CONTEXT *tdb; int ret, status=0; pstring old_path; pstring new_path; tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDWR, 0600); if (tdb == NULL) goto failed; /* we have to do the map records first, as alias records may reference them */ ret = tdb_traverse(tdb, upgrade_map_record, &status); if (ret == -1 || status == -1) goto failed; ret = tdb_traverse(tdb, upgrade_alias_record, &status); if (ret == -1 || status == -1) goto failed; if (tdb) { tdb_close(tdb); tdb = NULL; } pstrcpy(old_path, tdb_path); pstrcpy(new_path, lock_path("group_mapping.tdb.upgraded")); if (rename(old_path, new_path) != 0) { DEBUG(0,("Failed to rename old group mapping database\n")); goto failed; } return True; failed: DEBUG(0,("Failed to upgrade group mapping database\n")); if (tdb) tdb_close(tdb); return False; }