/* SAM ldb module Copyright (C) Andrew Bartlett 2005 Copyright (C) Simo Sorce 2004-2008 Copyright (C) Matthias Dieter Wallnöfer 2009-2010 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 . */ /* * Name: ldb * * Component: ldb samldb module * * Description: various internal DSDB triggers - most for SAM specific objects * * Author: Simo Sorce */ #include "includes.h" #include "libcli/ldap/ldap_ndr.h" #include "ldb_module.h" #include "dsdb/samdb/samdb.h" #include "dsdb/samdb/ldb_modules/util.h" #include "dsdb/samdb/ldb_modules/ridalloc.h" #include "libcli/security/security.h" #include "librpc/gen_ndr/ndr_security.h" #include "ldb_wrap.h" #include "param/param.h" struct samldb_ctx; typedef int (*samldb_step_fn_t)(struct samldb_ctx *); struct samldb_step { struct samldb_step *next; samldb_step_fn_t fn; }; struct samldb_ctx { struct ldb_module *module; struct ldb_request *req; /* used for add operations */ const char *type; /* the resulting message */ struct ldb_message *msg; /* used in "samldb_find_for_defaultObjectCategory" */ struct ldb_dn *dn, *res_dn; /* all the async steps necessary to complete the operation */ struct samldb_step *steps; struct samldb_step *curstep; /* If someone set an ares to forward controls and response back to the caller */ struct ldb_reply *ares; }; static struct samldb_ctx *samldb_ctx_init(struct ldb_module *module, struct ldb_request *req) { struct ldb_context *ldb; struct samldb_ctx *ac; ldb = ldb_module_get_ctx(module); ac = talloc_zero(req, struct samldb_ctx); if (ac == NULL) { ldb_oom(ldb); return NULL; } ac->module = module; ac->req = req; return ac; } static int samldb_add_step(struct samldb_ctx *ac, samldb_step_fn_t fn) { struct samldb_step *step, *stepper; step = talloc_zero(ac, struct samldb_step); if (step == NULL) { return ldb_oom(ldb_module_get_ctx(ac->module)); } step->fn = fn; if (ac->steps == NULL) { ac->steps = step; ac->curstep = step; } else { if (ac->curstep == NULL) return ldb_operr(ldb_module_get_ctx(ac->module)); for (stepper = ac->curstep; stepper->next != NULL; stepper = stepper->next); stepper->next = step; } return LDB_SUCCESS; } static int samldb_first_step(struct samldb_ctx *ac) { if (ac->steps == NULL) { return ldb_operr(ldb_module_get_ctx(ac->module)); } ac->curstep = ac->steps; return ac->curstep->fn(ac); } static int samldb_next_step(struct samldb_ctx *ac) { if (ac->curstep->next) { ac->curstep = ac->curstep->next; return ac->curstep->fn(ac); } /* We exit the samldb module here. If someone set an "ares" to forward * controls and response back to the caller, use them. */ if (ac->ares) { return ldb_module_done(ac->req, ac->ares->controls, ac->ares->response, LDB_SUCCESS); } else { return ldb_module_done(ac->req, NULL, NULL, LDB_SUCCESS); } } /* sAMAccountName handling */ static int samldb_generate_sAMAccountName(struct ldb_context *ldb, struct ldb_message *msg) { char *name; /* Format: $000000-000000000000 */ name = talloc_asprintf(msg, "$%.6X-%.6X%.6X", (unsigned int)generate_random(), (unsigned int)generate_random(), (unsigned int)generate_random()); if (name == NULL) { return ldb_oom(ldb); } return ldb_msg_add_steal_string(msg, "sAMAccountName", name); } static int samldb_check_sAMAccountName(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); const char *name; int ret; struct ldb_result *res; const char *noattrs[] = { NULL }; if (ldb_msg_find_element(ac->msg, "sAMAccountName") == NULL) { ret = samldb_generate_sAMAccountName(ldb, ac->msg); if (ret != LDB_SUCCESS) { return ret; } } name = ldb_msg_find_attr_as_string(ac->msg, "sAMAccountName", NULL); if (name == NULL) { /* The "sAMAccountName" cannot be nothing */ ldb_set_errstring(ldb, "samldb: Empty account names aren't allowed!"); return LDB_ERR_CONSTRAINT_VIOLATION; } ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs, DSDB_FLAG_NEXT_MODULE, "(sAMAccountName=%s)", ldb_binary_encode_string(ac, name)); if (ret != LDB_SUCCESS) { return ret; } if (res->count != 0) { ldb_asprintf_errstring(ldb, "samldb: Account name (sAMAccountName) '%s' already in use!", name); talloc_free(res); return LDB_ERR_ENTRY_ALREADY_EXISTS; } talloc_free(res); return samldb_next_step(ac); } static bool samldb_msg_add_sid(struct ldb_message *msg, const char *name, const struct dom_sid *sid) { struct ldb_val v; enum ndr_err_code ndr_err; ndr_err = ndr_push_struct_blob(&v, msg, sid, (ndr_push_flags_fn_t)ndr_push_dom_sid); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { return false; } return (ldb_msg_add_value(msg, name, &v, NULL) == 0); } /* allocate a SID using our RID Set */ static int samldb_allocate_sid(struct samldb_ctx *ac) { uint32_t rid; struct dom_sid *sid; struct ldb_context *ldb = ldb_module_get_ctx(ac->module); int ret; ret = ridalloc_allocate_rid(ac->module, &rid); if (ret != LDB_SUCCESS) { return ret; } sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid); if (sid == NULL) { return ldb_module_oom(ac->module); } if ( ! samldb_msg_add_sid(ac->msg, "objectSid", sid)) { return ldb_operr(ldb); } return samldb_next_step(ac); } /* see if a krbtgt_number is available */ static bool samldb_krbtgtnumber_available(struct samldb_ctx *ac, uint32_t krbtgt_number) { TALLOC_CTX *tmp_ctx = talloc_new(ac); struct ldb_result *res; const char *no_attrs[] = { NULL }; int ret; ret = dsdb_module_search(ac->module, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs, DSDB_FLAG_NEXT_MODULE, "(msDC-SecondaryKrbTgtNumber=%u)", krbtgt_number); if (ret == LDB_SUCCESS && res->count == 0) { talloc_free(tmp_ctx); return true; } talloc_free(tmp_ctx); return false; } /* special handling for add in RODC join */ static int samldb_rodc_add(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); uint32_t krbtgt_number, i_start, i; int ret; char *newpass; struct ldb_val newpass_utf16; /* find a unused msDC-SecondaryKrbTgtNumber */ i_start = generate_random() & 0xFFFF; if (i_start == 0) { i_start = 1; } for (i=i_start; i<=0xFFFF; i++) { if (samldb_krbtgtnumber_available(ac, i)) { krbtgt_number = i; goto found; } } for (i=1; imsg, "msDS-SecondaryKrbTgtNumber", LDB_FLAG_INTERNAL_DISABLE_VALIDATION, NULL); if (ret != LDB_SUCCESS) { return ldb_operr(ldb); } ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "msDS-SecondaryKrbTgtNumber", krbtgt_number); if (ret != LDB_SUCCESS) { return ldb_operr(ldb); } ret = ldb_msg_add_fmt(ac->msg, "sAMAccountName", "krbtgt_%u", krbtgt_number); if (ret != LDB_SUCCESS) { return ldb_operr(ldb); } newpass = generate_random_password(ac->msg, 128, 255); if (newpass == NULL) { return ldb_operr(ldb); } if (!convert_string_talloc(ac, CH_UNIX, CH_UTF16, newpass, strlen(newpass), (void *)&newpass_utf16.data, &newpass_utf16.length, false)) { ldb_asprintf_errstring(ldb, "samldb_rodc_add: " "failed to generate UTF16 password from random password"); return LDB_ERR_OPERATIONS_ERROR; } ret = ldb_msg_add_steal_value(ac->msg, "clearTextPassword", &newpass_utf16); if (ret != LDB_SUCCESS) { return ldb_operr(ldb); } return samldb_next_step(ac); } static int samldb_find_for_defaultObjectCategory(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); struct ldb_result *res; const char *no_attrs[] = { NULL }; int ret; ac->res_dn = NULL; ret = dsdb_module_search(ac->module, ac, &res, ac->dn, LDB_SCOPE_BASE, no_attrs, DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT | DSDB_FLAG_NEXT_MODULE, "(objectClass=classSchema)"); if (ret == LDB_ERR_NO_SUCH_OBJECT) { /* Don't be pricky when the DN doesn't exist if we have the */ /* RELAX control specified */ if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL) { ldb_set_errstring(ldb, "samldb_find_defaultObjectCategory: " "Invalid DN for 'defaultObjectCategory'!"); return LDB_ERR_CONSTRAINT_VIOLATION; } } if ((ret != LDB_ERR_NO_SUCH_OBJECT) && (ret != LDB_SUCCESS)) { return ret; } ac->res_dn = ac->dn; return samldb_next_step(ac); } /** * msDS-IntId attributeSchema attribute handling * during LDB_ADD request processing */ static int samldb_add_handle_msDS_IntId(struct samldb_ctx *ac) { int ret; bool id_exists; uint32_t msds_intid; int32_t system_flags; struct ldb_context *ldb; struct ldb_result *ldb_res; struct ldb_dn *schema_dn; ldb = ldb_module_get_ctx(ac->module); schema_dn = ldb_get_schema_basedn(ldb); /* replicated update should always go through */ if (ldb_request_get_control(ac->req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) { return LDB_SUCCESS; } /* msDS-IntId is handled by system and should never be * passed by clients */ if (ldb_msg_find_element(ac->msg, "msDS-IntId")) { return LDB_ERR_UNWILLING_TO_PERFORM; } /* do not generate msDS-IntId if Relax control is passed */ if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) { return LDB_SUCCESS; } /* check Functional Level */ if (dsdb_functional_level(ldb) < DS_DOMAIN_FUNCTION_2003) { return LDB_SUCCESS; } /* check systemFlags for SCHEMA_BASE_OBJECT flag */ system_flags = ldb_msg_find_attr_as_int(ac->msg, "systemFlags", 0); if (system_flags & SYSTEM_FLAG_SCHEMA_BASE_OBJECT) { return LDB_SUCCESS; } /* Generate new value for msDs-IntId * Value should be in 0x80000000..0xBFFFFFFF range */ msds_intid = generate_random() % 0X3FFFFFFF; msds_intid += 0x80000000; /* probe id values until unique one is found */ do { msds_intid++; if (msds_intid > 0xBFFFFFFF) { msds_intid = 0x80000001; } ret = dsdb_module_search(ac->module, ac, &ldb_res, schema_dn, LDB_SCOPE_ONELEVEL, NULL, DSDB_FLAG_NEXT_MODULE, "(msDS-IntId=%d)", msds_intid); if (ret != LDB_SUCCESS) { ldb_debug_set(ldb, LDB_DEBUG_ERROR, __location__": Searching for msDS-IntId=%d failed - %s\n", msds_intid, ldb_errstring(ldb)); return ldb_operr(ldb); } id_exists = (ldb_res->count > 0); talloc_free(ldb_res); } while(id_exists); return samdb_msg_add_int(ldb, ac->msg, ac->msg, "msDS-IntId", msds_intid); } /* * samldb_add_entry (async) */ static int samldb_add_entry_callback(struct ldb_request *req, struct ldb_reply *ares) { struct ldb_context *ldb; struct samldb_ctx *ac; int ret; ac = talloc_get_type(req->context, struct samldb_ctx); ldb = ldb_module_get_ctx(ac->module); if (!ares) { return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR); } if (ares->type == LDB_REPLY_REFERRAL) { return ldb_module_send_referral(ac->req, ares->referral); } if (ares->error != LDB_SUCCESS) { return ldb_module_done(ac->req, ares->controls, ares->response, ares->error); } if (ares->type != LDB_REPLY_DONE) { ldb_set_errstring(ldb, "Invalid reply type!\n"); return ldb_module_done(ac->req, NULL, NULL, LDB_ERR_OPERATIONS_ERROR); } /* The caller may wish to get controls back from the add */ ac->ares = talloc_steal(ac, ares); ret = samldb_next_step(ac); if (ret != LDB_SUCCESS) { return ldb_module_done(ac->req, NULL, NULL, ret); } return ret; } static int samldb_add_entry(struct samldb_ctx *ac) { struct ldb_context *ldb; struct ldb_request *req; int ret; ldb = ldb_module_get_ctx(ac->module); ret = ldb_build_add_req(&req, ldb, ac, ac->msg, ac->req->controls, ac, samldb_add_entry_callback, ac->req); LDB_REQ_SET_LOCATION(req); if (ret != LDB_SUCCESS) { return ret; } return ldb_next_request(ac->module, req); } /* * return true if msg carries an attributeSchema that is intended to be RODC * filtered but is also a system-critical attribute. */ static bool check_rodc_critical_attribute(struct ldb_message *msg) { uint32_t schemaFlagsEx, searchFlags, rodc_filtered_flags; schemaFlagsEx = ldb_msg_find_attr_as_uint(msg, "schemaFlagsEx", 0); searchFlags = ldb_msg_find_attr_as_uint(msg, "searchFlags", 0); rodc_filtered_flags = (SEARCH_FLAG_RODC_ATTRIBUTE | SEARCH_FLAG_CONFIDENTIAL); if ((schemaFlagsEx & SCHEMA_FLAG_ATTR_IS_CRITICAL) && ((searchFlags & rodc_filtered_flags) == rodc_filtered_flags)) { return true; } else { return false; } } static int samldb_fill_object(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); int ret; /* Add informations for the different account types */ if (strcmp(ac->type, "user") == 0) { struct ldb_control *rodc_control = ldb_request_get_control(ac->req, LDB_CONTROL_RODC_DCPROMO_OID); if (rodc_control != NULL) { /* see [MS-ADTS] 3.1.1.3.4.1.23 LDAP_SERVER_RODC_DCPROMO_OID */ rodc_control->critical = false; ret = samldb_add_step(ac, samldb_rodc_add); if (ret != LDB_SUCCESS) return ret; } /* check if we have a valid sAMAccountName */ ret = samldb_add_step(ac, samldb_check_sAMAccountName); if (ret != LDB_SUCCESS) return ret; ret = samldb_add_step(ac, samldb_add_entry); if (ret != LDB_SUCCESS) return ret; } else if (strcmp(ac->type, "group") == 0) { /* check if we have a valid sAMAccountName */ ret = samldb_add_step(ac, samldb_check_sAMAccountName); if (ret != LDB_SUCCESS) return ret; ret = samldb_add_step(ac, samldb_add_entry); if (ret != LDB_SUCCESS) return ret; } else if (strcmp(ac->type, "classSchema") == 0) { const struct ldb_val *rdn_value, *def_obj_cat_val; ret = samdb_find_or_add_attribute(ldb, ac->msg, "rdnAttId", "cn"); if (ret != LDB_SUCCESS) return ret; /* do not allow to mark an attributeSchema as RODC filtered if it * is system-critical */ if (check_rodc_critical_attribute(ac->msg)) { ldb_asprintf_errstring(ldb, "Refusing schema add of %s - cannot combine critical class with RODC filtering", ldb_dn_get_linearized(ac->msg->dn)); return LDB_ERR_UNWILLING_TO_PERFORM; } rdn_value = ldb_dn_get_rdn_val(ac->msg->dn); if (rdn_value == NULL) { return ldb_operr(ldb); } if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) { /* the RDN has prefix "CN" */ ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName", samdb_cn_to_lDAPDisplayName(ac->msg, (const char *) rdn_value->data)); if (ret != LDB_SUCCESS) { ldb_oom(ldb); return ret; } } if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) { struct GUID guid; /* a new GUID */ guid = GUID_random(); ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID"); if (ret != LDB_SUCCESS) { ldb_oom(ldb); return ret; } } def_obj_cat_val = ldb_msg_find_ldb_val(ac->msg, "defaultObjectCategory"); if (def_obj_cat_val != NULL) { /* "defaultObjectCategory" has been set by the caller. * Do some checks for consistency. * NOTE: The real constraint check (that * 'defaultObjectCategory' is the DN of the new * objectclass or any parent of it) is still incomplete. * For now we say that 'defaultObjectCategory' is valid * if it exists and it is of objectclass "classSchema". */ ac->dn = ldb_dn_from_ldb_val(ac, ldb, def_obj_cat_val); if (ac->dn == NULL) { ldb_set_errstring(ldb, "Invalid DN for 'defaultObjectCategory'!"); return LDB_ERR_CONSTRAINT_VIOLATION; } } else { /* "defaultObjectCategory" has not been set by the * caller. Use the entry DN for it. */ ac->dn = ac->msg->dn; ret = ldb_msg_add_string(ac->msg, "defaultObjectCategory", ldb_dn_alloc_linearized(ac->msg, ac->dn)); if (ret != LDB_SUCCESS) { ldb_oom(ldb); return ret; } } ret = samldb_add_step(ac, samldb_add_entry); if (ret != LDB_SUCCESS) return ret; /* Now perform the checks for the 'defaultObjectCategory'. The * lookup DN was already saved in "ac->dn" */ ret = samldb_add_step(ac, samldb_find_for_defaultObjectCategory); if (ret != LDB_SUCCESS) return ret; } else if (strcmp(ac->type, "attributeSchema") == 0) { const struct ldb_val *rdn_value; rdn_value = ldb_dn_get_rdn_val(ac->msg->dn); if (rdn_value == NULL) { return ldb_operr(ldb); } if (!ldb_msg_find_element(ac->msg, "lDAPDisplayName")) { /* the RDN has prefix "CN" */ ret = ldb_msg_add_string(ac->msg, "lDAPDisplayName", samdb_cn_to_lDAPDisplayName(ac->msg, (const char *) rdn_value->data)); if (ret != LDB_SUCCESS) { ldb_oom(ldb); return ret; } } /* do not allow to mark an attributeSchema as RODC filtered if it * is system-critical */ if (check_rodc_critical_attribute(ac->msg)) { ldb_asprintf_errstring(ldb, "samldb: refusing schema add of %s - cannot combine critical attribute with RODC filtering", ldb_dn_get_linearized(ac->msg->dn)); return LDB_ERR_UNWILLING_TO_PERFORM; } ret = samdb_find_or_add_attribute(ldb, ac->msg, "isSingleValued", "FALSE"); if (ret != LDB_SUCCESS) return ret; if (!ldb_msg_find_element(ac->msg, "schemaIDGUID")) { struct GUID guid; /* a new GUID */ guid = GUID_random(); ret = dsdb_msg_add_guid(ac->msg, &guid, "schemaIDGUID"); if (ret != LDB_SUCCESS) { ldb_oom(ldb); return ret; } } /* handle msDS-IntID attribute */ ret = samldb_add_handle_msDS_IntId(ac); if (ret != LDB_SUCCESS) return ret; ret = samldb_add_step(ac, samldb_add_entry); if (ret != LDB_SUCCESS) return ret; } else { ldb_asprintf_errstring(ldb, "Invalid entry type!"); return LDB_ERR_OPERATIONS_ERROR; } return samldb_first_step(ac); } static int samldb_fill_foreignSecurityPrincipal_object(struct samldb_ctx *ac) { struct ldb_context *ldb; const struct ldb_val *rdn_value; struct dom_sid *sid; int ret; ldb = ldb_module_get_ctx(ac->module); sid = samdb_result_dom_sid(ac->msg, ac->msg, "objectSid"); if (sid == NULL) { rdn_value = ldb_dn_get_rdn_val(ac->msg->dn); if (rdn_value == NULL) { return ldb_operr(ldb); } sid = dom_sid_parse_talloc(ac->msg, (const char *)rdn_value->data); if (sid == NULL) { ldb_set_errstring(ldb, "samldb: No valid SID found in ForeignSecurityPrincipal CN!"); return LDB_ERR_CONSTRAINT_VIOLATION; } if (! samldb_msg_add_sid(ac->msg, "objectSid", sid)) { return ldb_operr(ldb); } } /* finally proceed with adding the entry */ ret = samldb_add_step(ac, samldb_add_entry); if (ret != LDB_SUCCESS) return ret; return samldb_first_step(ac); } static int samldb_schema_info_update(struct samldb_ctx *ac) { int ret; struct ldb_context *ldb; struct dsdb_schema *schema; /* replicated update should always go through */ if (ldb_request_get_control(ac->req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) { return LDB_SUCCESS; } /* do not update schemaInfo during provisioning */ if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) { return LDB_SUCCESS; } ldb = ldb_module_get_ctx(ac->module); schema = dsdb_get_schema(ldb, NULL); if (!schema) { ldb_debug_set(ldb, LDB_DEBUG_FATAL, "samldb_schema_info_update: no dsdb_schema loaded"); DEBUG(0,(__location__ ": %s\n", ldb_errstring(ldb))); return ldb_operr(ldb); } ret = dsdb_module_schema_info_update(ac->module, schema, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { ldb_asprintf_errstring(ldb, "samldb_schema_info_update: dsdb_module_schema_info_update failed with %s", ldb_errstring(ldb)); return ret; } return LDB_SUCCESS; } /* * "Objectclass" trigger (MS-SAMR 3.1.1.8.1) * * Has to be invoked on "add" and "modify" operations on "user", "computer" and * "group" objects. * ac->msg contains the "add"/"modify" message * ac->type contains the object type (main objectclass) */ static int samldb_objectclass_trigger(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(ldb, "loadparm"), struct loadparm_context); struct ldb_message_element *el, *el2; enum sid_generator sid_generator; struct dom_sid *sid; int ret; /* make sure that "sAMAccountType" is not specified */ el = ldb_msg_find_element(ac->msg, "sAMAccountType"); if (el != NULL) { ldb_set_errstring(ldb, "samldb: sAMAccountType must not be specified!"); return LDB_ERR_UNWILLING_TO_PERFORM; } /* Step 1: objectSid assignment */ /* Don't allow the objectSid to be changed. But beside the RELAX * control we have also to guarantee that it can always be set with * SYSTEM permissions. This is needed for the "samba3sam" backend. */ sid = samdb_result_dom_sid(ac, ac->msg, "objectSid"); if ((sid != NULL) && (!dsdb_module_am_system(ac->module)) && (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL)) { ldb_set_errstring(ldb, "samldb: objectSid must not be specified!"); return LDB_ERR_UNWILLING_TO_PERFORM; } /* but generate a new SID when we do have an add operations */ if ((sid == NULL) && (ac->req->operation == LDB_ADD)) { sid_generator = lpcfg_sid_generator(lp_ctx); if (sid_generator == SID_GENERATOR_INTERNAL) { ret = samldb_add_step(ac, samldb_allocate_sid); if (ret != LDB_SUCCESS) return ret; } } if (strcmp(ac->type, "user") == 0) { bool uac_generated = false; /* Step 1.2: Default values */ ret = samdb_find_or_add_attribute(ldb, ac->msg, "accountExpires", "9223372036854775807"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "badPasswordTime", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "badPwdCount", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "codePage", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "countryCode", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "lastLogoff", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "lastLogon", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "logonCount", "0"); if (ret != LDB_SUCCESS) return ret; ret = samdb_find_or_add_attribute(ldb, ac->msg, "pwdLastSet", "0"); if (ret != LDB_SUCCESS) return ret; /* On add operations we might need to generate a * "userAccountControl" (if it isn't specified). */ el = ldb_msg_find_element(ac->msg, "userAccountControl"); if ((el == NULL) && (ac->req->operation == LDB_ADD)) { ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg, "userAccountControl", UF_NORMAL_ACCOUNT); if (ret != LDB_SUCCESS) { return ret; } uac_generated = true; } el = ldb_msg_find_element(ac->msg, "userAccountControl"); if (el != NULL) { uint32_t user_account_control, account_type; /* Step 1.3: "userAccountControl" -> "sAMAccountType" mapping */ user_account_control = ldb_msg_find_attr_as_uint(ac->msg, "userAccountControl", 0); /* Temporary duplicate accounts aren't allowed */ if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) { return LDB_ERR_OTHER; } account_type = ds_uf2atype(user_account_control); if (account_type == 0) { ldb_set_errstring(ldb, "samldb: Unrecognized account type!"); return LDB_ERR_UNWILLING_TO_PERFORM; } ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType", account_type); if (ret != LDB_SUCCESS) { return ret; } el2 = ldb_msg_find_element(ac->msg, "sAMAccountType"); el2->flags = LDB_FLAG_MOD_REPLACE; if (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) { ret = samdb_msg_set_string(ldb, ac->msg, ac->msg, "isCriticalSystemObject", "TRUE"); if (ret != LDB_SUCCESS) { return ret; } el2 = ldb_msg_find_element(ac->msg, "isCriticalSystemObject"); el2->flags = LDB_FLAG_MOD_REPLACE; } /* Step 1.4: "userAccountControl" -> "primaryGroupID" mapping */ if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) { uint32_t rid = ds_uf2prim_group_rid(user_account_control); ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "primaryGroupID", rid); if (ret != LDB_SUCCESS) { return ret; } el2 = ldb_msg_find_element(ac->msg, "primaryGroupID"); el2->flags = LDB_FLAG_MOD_REPLACE; } /* Step 1.5: Add additional flags when needed */ /* Obviously this is done when the "userAccountControl" * has been generated here (tested against Windows * Server) */ if (uac_generated) { user_account_control |= UF_ACCOUNTDISABLE; user_account_control |= UF_PASSWD_NOTREQD; ret = samdb_msg_set_uint(ldb, ac->msg, ac->msg, "userAccountControl", user_account_control); if (ret != LDB_SUCCESS) { return ret; } } } } else if (strcmp(ac->type, "group") == 0) { const char *tempstr; /* Step 2.2: Default values */ tempstr = talloc_asprintf(ac->msg, "%d", GTYPE_SECURITY_GLOBAL_GROUP); if (tempstr == NULL) return ldb_operr(ldb); ret = samdb_find_or_add_attribute(ldb, ac->msg, "groupType", tempstr); if (ret != LDB_SUCCESS) return ret; /* Step 2.3: "groupType" -> "sAMAccountType" */ el = ldb_msg_find_element(ac->msg, "groupType"); if (el != NULL) { uint32_t group_type, account_type; group_type = ldb_msg_find_attr_as_uint(ac->msg, "groupType", 0); /* The creation of builtin groups requires the * RELAX control */ if (group_type == GTYPE_SECURITY_BUILTIN_LOCAL_GROUP) { if (ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID) == NULL) { return LDB_ERR_UNWILLING_TO_PERFORM; } } account_type = ds_gtype2atype(group_type); if (account_type == 0) { ldb_set_errstring(ldb, "samldb: Unrecognized account type!"); return LDB_ERR_UNWILLING_TO_PERFORM; } ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType", account_type); if (ret != LDB_SUCCESS) { return ret; } el2 = ldb_msg_find_element(ac->msg, "sAMAccountType"); el2->flags = LDB_FLAG_MOD_REPLACE; } } return LDB_SUCCESS; } /* * "Primary group ID" trigger (MS-SAMR 3.1.1.8.2) * * Has to be invoked on "add" and "modify" operations on "user" and "computer" * objects. * ac->msg contains the "add"/"modify" message */ static int samldb_prim_group_set(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); uint32_t rid; struct dom_sid *sid; struct ldb_result *res; int ret; const char *noattrs[] = { NULL }; rid = ldb_msg_find_attr_as_uint(ac->msg, "primaryGroupID", (uint32_t) -1); if (rid == (uint32_t) -1) { /* we aren't affected of any primary group set */ return LDB_SUCCESS; } else if (!ldb_request_get_control(ac->req, LDB_CONTROL_RELAX_OID)) { ldb_set_errstring(ldb, "The primary group isn't settable on add operations!"); return LDB_ERR_UNWILLING_TO_PERFORM; } sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), rid); if (sid == NULL) { return ldb_operr(ldb); } ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs, DSDB_FLAG_NEXT_MODULE, "(objectSid=%s)", ldap_encode_ndr_dom_sid(ac, sid)); if (ret != LDB_SUCCESS) { return ret; } if (res->count != 1) { talloc_free(res); ldb_asprintf_errstring(ldb, "Failed to find primary group with RID %u!", rid); return LDB_ERR_UNWILLING_TO_PERFORM; } talloc_free(res); return LDB_SUCCESS; } static int samldb_prim_group_change(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); const char * attrs[] = { "primaryGroupID", "memberOf", NULL }; struct ldb_result *res, *group_res; struct ldb_message_element *el; struct ldb_message *msg; uint32_t prev_rid, new_rid; struct dom_sid *prev_sid, *new_sid; struct ldb_dn *prev_prim_group_dn, *new_prim_group_dn; int ret; const char *noattrs[] = { NULL }; el = dsdb_get_single_valued_attr(ac->msg, "primaryGroupID", ac->req->operation); if (el == NULL) { /* we are not affected */ return LDB_SUCCESS; } /* Fetch informations from the existing object */ ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs, NULL); if (ret != LDB_SUCCESS) { return ret; } if (res->count != 1) { return ldb_operr(ldb); } /* Finds out the DN of the old primary group */ prev_rid = ldb_msg_find_attr_as_uint(res->msgs[0], "primaryGroupID", (uint32_t) -1); if (prev_rid == (uint32_t) -1) { /* User objects do always have a mandatory "primaryGroupID" * attribute. If this doesn't exist then the object is of the * wrong type. This is the exact Windows error code */ return LDB_ERR_OBJECT_CLASS_VIOLATION; } prev_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prev_rid); if (prev_sid == NULL) { return ldb_operr(ldb); } /* Finds out the DN of the new primary group * Notice: in order to parse the primary group ID correctly we create * a temporary message here. */ msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(msg, el, 0); if (ret != LDB_SUCCESS) { return ret; } new_rid = ldb_msg_find_attr_as_uint(msg, "primaryGroupID", (uint32_t) -1); talloc_free(msg); if (new_rid == (uint32_t) -1) { /* we aren't affected of any primary group change */ return LDB_SUCCESS; } if (prev_rid == new_rid) { return LDB_SUCCESS; } ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE, noattrs, DSDB_FLAG_NEXT_MODULE, "(objectSid=%s)", ldap_encode_ndr_dom_sid(ac, prev_sid)); if (ret != LDB_SUCCESS) { return ret; } if (group_res->count != 1) { return ldb_operr(ldb); } prev_prim_group_dn = group_res->msgs[0]->dn; new_sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), new_rid); if (new_sid == NULL) { return ldb_operr(ldb); } ret = dsdb_module_search(ac->module, ac, &group_res, NULL, LDB_SCOPE_SUBTREE, noattrs, DSDB_FLAG_NEXT_MODULE, "(objectSid=%s)", ldap_encode_ndr_dom_sid(ac, new_sid)); if (ret != LDB_SUCCESS) { return ret; } if (group_res->count != 1) { /* Here we know if the specified new primary group candidate is * valid or not. */ return LDB_ERR_UNWILLING_TO_PERFORM; } new_prim_group_dn = group_res->msgs[0]->dn; /* We need to be already a normal member of the new primary * group in order to be successful. */ el = samdb_find_attribute(ldb, res->msgs[0], "memberOf", ldb_dn_get_linearized(new_prim_group_dn)); if (el == NULL) { return LDB_ERR_UNWILLING_TO_PERFORM; } /* Remove the "member" attribute on the new primary group */ msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } msg->dn = new_prim_group_dn; ret = samdb_msg_add_delval(ldb, msg, msg, "member", ldb_dn_get_linearized(ac->msg->dn)); if (ret != LDB_SUCCESS) { return ret; } ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { return ret; } talloc_free(msg); /* Add a "member" attribute for the previous primary group */ msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } msg->dn = prev_prim_group_dn; ret = samdb_msg_add_addval(ldb, msg, msg, "member", ldb_dn_get_linearized(ac->msg->dn)); if (ret != LDB_SUCCESS) { return ret; } ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { return ret; } talloc_free(msg); return LDB_SUCCESS; } static int samldb_prim_group_trigger(struct samldb_ctx *ac) { int ret; if (ac->req->operation == LDB_ADD) { ret = samldb_prim_group_set(ac); } else { ret = samldb_prim_group_change(ac); } return ret; } static int samldb_user_account_control_change(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); uint32_t user_account_control, account_type; struct ldb_message_element *el; struct ldb_message *tmp_msg; int ret; el = dsdb_get_single_valued_attr(ac->msg, "userAccountControl", ac->req->operation); if (el == NULL) { /* we are not affected */ return LDB_SUCCESS; } /* Create a temporary message for fetching the "userAccountControl" */ tmp_msg = ldb_msg_new(ac->msg); if (tmp_msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(tmp_msg, el, 0); if (ret != LDB_SUCCESS) { return ret; } user_account_control = ldb_msg_find_attr_as_uint(tmp_msg, "userAccountControl", 0); talloc_free(tmp_msg); /* Temporary duplicate accounts aren't allowed */ if ((user_account_control & UF_TEMP_DUPLICATE_ACCOUNT) != 0) { return LDB_ERR_OTHER; } account_type = ds_uf2atype(user_account_control); if (account_type == 0) { ldb_set_errstring(ldb, "samldb: Unrecognized account type!"); return LDB_ERR_UNWILLING_TO_PERFORM; } ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType", account_type); if (ret != LDB_SUCCESS) { return ret; } el = ldb_msg_find_element(ac->msg, "sAMAccountType"); el->flags = LDB_FLAG_MOD_REPLACE; if (user_account_control & (UF_SERVER_TRUST_ACCOUNT | UF_PARTIAL_SECRETS_ACCOUNT)) { ret = samdb_msg_add_string(ldb, ac->msg, ac->msg, "isCriticalSystemObject", "TRUE"); if (ret != LDB_SUCCESS) { return ret; } el = ldb_msg_find_element(ac->msg, "isCriticalSystemObject"); el->flags = LDB_FLAG_MOD_REPLACE; } if (!ldb_msg_find_element(ac->msg, "primaryGroupID")) { uint32_t rid = ds_uf2prim_group_rid(user_account_control); ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "primaryGroupID", rid); if (ret != LDB_SUCCESS) { return ret; } el = ldb_msg_find_element(ac->msg, "primaryGroupID"); el->flags = LDB_FLAG_MOD_REPLACE; } return LDB_SUCCESS; } static int samldb_group_type_change(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); uint32_t group_type, old_group_type, account_type; struct ldb_message_element *el; struct ldb_message *tmp_msg; int ret; struct ldb_result *res; const char *attrs[] = { "groupType", NULL }; el = dsdb_get_single_valued_attr(ac->msg, "groupType", ac->req->operation); if (el == NULL) { /* we are not affected */ return LDB_SUCCESS; } /* Create a temporary message for fetching the "groupType" */ tmp_msg = ldb_msg_new(ac->msg); if (tmp_msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(tmp_msg, el, 0); if (ret != LDB_SUCCESS) { return ret; } group_type = ldb_msg_find_attr_as_uint(tmp_msg, "groupType", 0); talloc_free(tmp_msg); ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, attrs, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { return ret; } old_group_type = ldb_msg_find_attr_as_uint(res->msgs[0], "groupType", 0); if (old_group_type == 0) { return ldb_operr(ldb); } /* Group type switching isn't so easy as it seems: We can only * change in this directions: global <-> universal <-> local * On each step also the group type itself * (security/distribution) is variable. */ if (ldb_request_get_control(ac->req, LDB_CONTROL_PROVISION_OID) == NULL) { switch (group_type) { case GTYPE_SECURITY_GLOBAL_GROUP: case GTYPE_DISTRIBUTION_GLOBAL_GROUP: /* change to "universal" allowed */ if ((old_group_type == GTYPE_SECURITY_DOMAIN_LOCAL_GROUP) || (old_group_type == GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP)) { ldb_set_errstring(ldb, "samldb: Change from security/distribution local group forbidden!"); return LDB_ERR_UNWILLING_TO_PERFORM; } break; case GTYPE_SECURITY_UNIVERSAL_GROUP: case GTYPE_DISTRIBUTION_UNIVERSAL_GROUP: /* each change allowed */ break; case GTYPE_SECURITY_DOMAIN_LOCAL_GROUP: case GTYPE_DISTRIBUTION_DOMAIN_LOCAL_GROUP: /* change to "universal" allowed */ if ((old_group_type == GTYPE_SECURITY_GLOBAL_GROUP) || (old_group_type == GTYPE_DISTRIBUTION_GLOBAL_GROUP)) { ldb_set_errstring(ldb, "samldb: Change from security/distribution global group forbidden!"); return LDB_ERR_UNWILLING_TO_PERFORM; } break; case GTYPE_SECURITY_BUILTIN_LOCAL_GROUP: default: /* we don't allow this "groupType" values */ return LDB_ERR_UNWILLING_TO_PERFORM; break; } } account_type = ds_gtype2atype(group_type); if (account_type == 0) { ldb_set_errstring(ldb, "samldb: Unrecognized account type!"); return LDB_ERR_UNWILLING_TO_PERFORM; } ret = samdb_msg_add_uint(ldb, ac->msg, ac->msg, "sAMAccountType", account_type); if (ret != LDB_SUCCESS) { return ret; } el = ldb_msg_find_element(ac->msg, "sAMAccountType"); el->flags = LDB_FLAG_MOD_REPLACE; return LDB_SUCCESS; } static int samldb_sam_accountname_check(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); const char *no_attrs[] = { NULL }; struct ldb_result *res; const char *sam_accountname, *enc_str; struct ldb_message_element *el; struct ldb_message *tmp_msg; int ret; el = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName", ac->req->operation); if (el == NULL) { /* we are not affected */ return LDB_SUCCESS; } /* Create a temporary message for fetching the "sAMAccountName" */ tmp_msg = ldb_msg_new(ac->msg); if (tmp_msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(tmp_msg, el, 0); if (ret != LDB_SUCCESS) { return ret; } sam_accountname = talloc_steal(ac, ldb_msg_find_attr_as_string(tmp_msg, "sAMAccountName", NULL)); talloc_free(tmp_msg); if (sam_accountname == NULL) { /* The "sAMAccountName" cannot be nothing */ ldb_set_errstring(ldb, "samldb: Empty account names aren't allowed!"); return LDB_ERR_UNWILLING_TO_PERFORM; } enc_str = ldb_binary_encode_string(ac, sam_accountname); if (enc_str == NULL) { return ldb_module_oom(ac->module); } /* Make sure that a "sAMAccountName" is only used once */ ret = ldb_search(ldb, ac, &res, NULL, LDB_SCOPE_SUBTREE, no_attrs, "(sAMAccountName=%s)", enc_str); if (ret != LDB_SUCCESS) { return ret; } if (res->count > 1) { return ldb_operr(ldb); } else if (res->count == 1) { if (ldb_dn_compare(res->msgs[0]->dn, ac->msg->dn) != 0) { ldb_asprintf_errstring(ldb, "samldb: Account name (sAMAccountName) '%s' already in use!", sam_accountname); return LDB_ERR_ENTRY_ALREADY_EXISTS; } } talloc_free(res); return LDB_SUCCESS; } static int samldb_member_check(struct samldb_ctx *ac) { static const char * const attrs[] = { "objectSid", "member", NULL }; struct ldb_context *ldb = ldb_module_get_ctx(ac->module); struct ldb_message_element *el; struct ldb_dn *member_dn; struct dom_sid *sid; struct ldb_result *res; struct dom_sid *group_sid; unsigned int i, j; int cnt; int ret; /* Fetch informations from the existing object */ ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs, NULL); if (ret != LDB_SUCCESS) { return ret; } if (res->count != 1) { return ldb_operr(ldb); } group_sid = samdb_result_dom_sid(res, res->msgs[0], "objectSid"); if (group_sid == NULL) { return ldb_operr(ldb); } /* We've to walk over all modification entries and consider the "member" * ones. */ for (i = 0; i < ac->msg->num_elements; i++) { if (ldb_attr_cmp(ac->msg->elements[i].name, "member") != 0) { continue; } el = &ac->msg->elements[i]; for (j = 0; j < el->num_values; j++) { struct ldb_message_element *mo; struct ldb_result *group_res; const char *group_attrs[] = { "primaryGroupID" , NULL }; uint32_t prim_group_rid; member_dn = ldb_dn_from_ldb_val(ac, ldb, &el->values[j]); if (!ldb_dn_validate(member_dn)) { return ldb_operr(ldb); } /* The "member" attribute can be modified with the * following restrictions (beside a valid DN): * * - "add" operations can only be performed when the * member still doesn't exist - if not then return * ERR_ENTRY_ALREADY_EXISTS (not * ERR_ATTRIBUTE_OR_VALUE_EXISTS!) * - "delete" operations can only be performed when the * member does exist - if not then return * ERR_UNWILLING_TO_PERFORM (not * ERR_NO_SUCH_ATTRIBUTE!) * - primary group check */ mo = samdb_find_attribute(ldb, res->msgs[0], "member", ldb_dn_get_linearized(member_dn)); if (mo == NULL) { cnt = 0; } else { cnt = 1; } if ((cnt > 0) && (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD)) { return LDB_ERR_ENTRY_ALREADY_EXISTS; } if ((cnt == 0) && LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_DELETE) { return LDB_ERR_UNWILLING_TO_PERFORM; } /* Denies to add "member"s to groups which are primary * ones for them - in this case return * ERR_ENTRY_ALREADY_EXISTS. */ ret = dsdb_module_search_dn(ac->module, ac, &group_res, member_dn, group_attrs, DSDB_FLAG_NEXT_MODULE); if (ret == LDB_ERR_NO_SUCH_OBJECT) { /* member DN doesn't exist yet */ continue; } if (ret != LDB_SUCCESS) { return ret; } prim_group_rid = ldb_msg_find_attr_as_uint(group_res->msgs[0], "primaryGroupID", (uint32_t)-1); if (prim_group_rid == (uint32_t) -1) { /* the member hasn't to be a user account -> * therefore no check needed in this case. */ continue; } sid = dom_sid_add_rid(ac, samdb_domain_sid(ldb), prim_group_rid); if (sid == NULL) { return ldb_operr(ldb); } if (dom_sid_equal(group_sid, sid)) { return LDB_ERR_ENTRY_ALREADY_EXISTS; } } } talloc_free(res); return LDB_SUCCESS; } /* SAM objects have special rules regarding the "description" attribute on * modify operations. */ static int samldb_description_check(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); const char * const attrs[] = { "objectClass", "description", NULL }; struct ldb_message_element *el; struct ldb_result *res; unsigned int i; int ret; /* Fetch informations from the existing object */ ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs, NULL); if (ret != LDB_SUCCESS) { return ret; } if (res->count != 1) { return ldb_operr(ldb); } /* if it's not a SAM object then please skip the constraints */ if ((samdb_find_attribute(ldb, res->msgs[0], "objectClass", "group") == NULL) && (samdb_find_attribute(ldb, res->msgs[0], "objectClass", "samDomain") == NULL) && (samdb_find_attribute(ldb, res->msgs[0], "objectClass", "samServer") == NULL) && (samdb_find_attribute(ldb, res->msgs[0], "objectClass", "user") == NULL)) { talloc_free(res); return LDB_SUCCESS; } /* We've to walk over all modification entries and consider the * "description" ones. */ for (i = 0; i < ac->msg->num_elements; i++) { if (ldb_attr_cmp(ac->msg->elements[i].name, "description") != 0) { continue; } el = &ac->msg->elements[i]; /* Multi-valued add or replace operations are always denied */ if ((LDB_FLAG_MOD_TYPE(el->flags) != LDB_FLAG_MOD_DELETE) && (el->num_values > 1)) { ldb_asprintf_errstring(ldb, "samldb: Description on SAM entry '%s' is changed using a multi-valued add or replace operation!", ldb_dn_get_linearized(ac->msg->dn)); return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS; } /* Add operations are only allowed if no value exists */ if (LDB_FLAG_MOD_TYPE(el->flags) == LDB_FLAG_MOD_ADD) { if (ldb_msg_find_element(res->msgs[0], "description") != NULL) { ldb_asprintf_errstring(ldb, "samldb: Description on SAM entry '%s' is changed using an add operation while a value already exists!", ldb_dn_get_linearized(ac->msg->dn)); return LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS; } } } talloc_free(res); return LDB_SUCCESS; } /* This trigger adapts the "servicePrincipalName" attributes if the * "dNSHostName" and/or "sAMAccountName" attribute change(s) */ static int samldb_service_principal_names_change(struct samldb_ctx *ac) { struct ldb_context *ldb = ldb_module_get_ctx(ac->module); struct ldb_message_element *el = NULL, *el2 = NULL; struct ldb_message *msg; const char *attrs[] = { "servicePrincipalName", NULL }; struct ldb_result *res; const char *dns_hostname = NULL, *old_dns_hostname = NULL, *sam_accountname = NULL, *old_sam_accountname = NULL; unsigned int i; int ret; el = dsdb_get_single_valued_attr(ac->msg, "dNSHostName", ac->req->operation); el2 = dsdb_get_single_valued_attr(ac->msg, "sAMAccountName", ac->req->operation); if ((el == NULL) && (el2 == NULL)) { /* we are not affected */ return LDB_SUCCESS; } /* Create a temporary message for fetching the "dNSHostName" */ if (el != NULL) { const char *dns_attrs[] = { "dNSHostName", NULL }; msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(msg, el, 0); if (ret != LDB_SUCCESS) { return ret; } dns_hostname = talloc_steal(ac, ldb_msg_find_attr_as_string(msg, "dNSHostName", NULL)); talloc_free(msg); ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, dns_attrs, DSDB_FLAG_NEXT_MODULE); if (ret == LDB_SUCCESS) { old_dns_hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL); } } /* Create a temporary message for fetching the "sAMAccountName" */ if (el2 != NULL) { char *tempstr, *tempstr2; const char *acct_attrs[] = { "sAMAccountName", NULL }; msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } ret = ldb_msg_add(msg, el2, 0); if (ret != LDB_SUCCESS) { return ret; } tempstr = talloc_strdup(ac, ldb_msg_find_attr_as_string(msg, "sAMAccountName", NULL)); talloc_free(msg); ret = dsdb_module_search_dn(ac->module, ac, &res, ac->msg->dn, acct_attrs, DSDB_FLAG_NEXT_MODULE); if (ret == LDB_SUCCESS) { tempstr2 = talloc_strdup(ac, ldb_msg_find_attr_as_string(res->msgs[0], "sAMAccountName", NULL)); } /* The "sAMAccountName" needs some additional trimming: we need * to remove the trailing "$"s if they exist. */ if ((tempstr != NULL) && (tempstr[0] != '\0') && (tempstr[strlen(tempstr) - 1] == '$')) { tempstr[strlen(tempstr) - 1] = '\0'; } if ((tempstr2 != NULL) && (tempstr2[0] != '\0') && (tempstr2[strlen(tempstr2) - 1] == '$')) { tempstr2[strlen(tempstr2) - 1] = '\0'; } sam_accountname = tempstr; old_sam_accountname = tempstr2; } if (old_dns_hostname == NULL) { /* we cannot change when the old name is unknown */ dns_hostname = NULL; } if ((old_dns_hostname != NULL) && (dns_hostname != NULL) && (strcasecmp(old_dns_hostname, dns_hostname) == 0)) { /* The "dNSHostName" didn't change */ dns_hostname = NULL; } if (old_sam_accountname == NULL) { /* we cannot change when the old name is unknown */ sam_accountname = NULL; } if ((old_sam_accountname != NULL) && (sam_accountname != NULL) && (strcasecmp(old_sam_accountname, sam_accountname) == 0)) { /* The "sAMAccountName" didn't change */ sam_accountname = NULL; } if ((dns_hostname == NULL) && (sam_accountname == NULL)) { /* Well, there are informations missing (old name(s)) or the * names didn't change. We've nothing to do and can exit here */ return LDB_SUCCESS; } /* Potential "servicePrincipalName" changes in the same request have to * be handled before the update (Windows behaviour). */ el = ldb_msg_find_element(ac->msg, "servicePrincipalName"); if (el != NULL) { msg = ldb_msg_new(ac->msg); if (msg == NULL) { return ldb_module_oom(ac->module); } msg->dn = ac->msg->dn; do { ret = ldb_msg_add(msg, el, el->flags); if (ret != LDB_SUCCESS) { return ret; } ldb_msg_remove_element(ac->msg, el); el = ldb_msg_find_element(ac->msg, "servicePrincipalName"); } while (el != NULL); ret = dsdb_module_modify(ac->module, msg, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { return ret; } talloc_free(msg); } /* Fetch the "servicePrincipalName"s if any */ ret = ldb_search(ldb, ac, &res, ac->msg->dn, LDB_SCOPE_BASE, attrs, NULL); if (ret != LDB_SUCCESS) { return ret; } if ((res->count != 1) || (res->msgs[0]->num_elements > 1)) { return ldb_operr(ldb); } if (res->msgs[0]->num_elements == 1) { /* Yes, we do have "servicePrincipalName"s. First we update them * locally, that means we do always substitute the current * "dNSHostName" with the new one and/or "sAMAccountName" * without "$" with the new one and then we append this to the * modification request (Windows behaviour). */ for (i = 0; i < res->msgs[0]->elements[0].num_values; i++) { char *old_str, *new_str, *pos; const char *tok; old_str = (char *) res->msgs[0]->elements[0].values[i].data; new_str = talloc_strdup(ac->msg, strtok_r(old_str, "/", &pos)); if (new_str == NULL) { return ldb_module_oom(ac->module); } while ((tok = strtok_r(NULL, "/", &pos)) != NULL) { if ((dns_hostname != NULL) && (strcasecmp(tok, old_dns_hostname) == 0)) { tok = dns_hostname; } if ((sam_accountname != NULL) && (strcasecmp(tok, old_sam_accountname) == 0)) { tok = sam_accountname; } new_str = talloc_asprintf(ac->msg, "%s/%s", new_str, tok); if (new_str == NULL) { return ldb_module_oom(ac->module); } } ret = ldb_msg_add_string(ac->msg, "servicePrincipalName", new_str); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "servicePrincipalName"); el->flags = LDB_FLAG_MOD_REPLACE; } talloc_free(res); return LDB_SUCCESS; } /* add */ static int samldb_add(struct ldb_module *module, struct ldb_request *req) { struct ldb_context *ldb; struct samldb_ctx *ac; int ret; ldb = ldb_module_get_ctx(module); ldb_debug(ldb, LDB_DEBUG_TRACE, "samldb_add\n"); /* do not manipulate our control entries */ if (ldb_dn_is_special(req->op.add.message->dn)) { return ldb_next_request(module, req); } ac = samldb_ctx_init(module, req); if (ac == NULL) { return ldb_operr(ldb); } /* build the new msg */ ac->msg = ldb_msg_copy_shallow(ac, req->op.add.message); if (ac->msg == NULL) { talloc_free(ac); ldb_debug(ldb, LDB_DEBUG_FATAL, "samldb_add: ldb_msg_copy_shallow failed!\n"); return ldb_operr(ldb); } if (samdb_find_attribute(ldb, ac->msg, "objectclass", "user") != NULL) { ac->type = "user"; ret = samldb_prim_group_trigger(ac); if (ret != LDB_SUCCESS) { return ret; } ret = samldb_objectclass_trigger(ac); if (ret != LDB_SUCCESS) { return ret; } return samldb_fill_object(ac); } if (samdb_find_attribute(ldb, ac->msg, "objectclass", "group") != NULL) { ac->type = "group"; ret = samldb_objectclass_trigger(ac); if (ret != LDB_SUCCESS) { return ret; } return samldb_fill_object(ac); } /* perhaps a foreignSecurityPrincipal? */ if (samdb_find_attribute(ldb, ac->msg, "objectclass", "foreignSecurityPrincipal") != NULL) { return samldb_fill_foreignSecurityPrincipal_object(ac); } if (samdb_find_attribute(ldb, ac->msg, "objectclass", "classSchema") != NULL) { ret = samldb_schema_info_update(ac); if (ret != LDB_SUCCESS) { talloc_free(ac); return ret; } ac->type = "classSchema"; return samldb_fill_object(ac); } if (samdb_find_attribute(ldb, ac->msg, "objectclass", "attributeSchema") != NULL) { ret = samldb_schema_info_update(ac); if (ret != LDB_SUCCESS) { talloc_free(ac); return ret; } ac->type = "attributeSchema"; return samldb_fill_object(ac); } talloc_free(ac); /* nothing matched, go on */ return ldb_next_request(module, req); } /* modify */ static int samldb_modify(struct ldb_module *module, struct ldb_request *req) { struct ldb_context *ldb; struct samldb_ctx *ac; struct ldb_message_element *el, *el2; bool modified = false; int ret; if (ldb_dn_is_special(req->op.mod.message->dn)) { /* do not manipulate our control entries */ return ldb_next_request(module, req); } ldb = ldb_module_get_ctx(module); /* make sure that "objectSid" is not specified */ el = ldb_msg_find_element(req->op.mod.message, "objectSid"); if (el != NULL) { ldb_set_errstring(ldb, "samldb: objectSid must not be specified!"); return LDB_ERR_UNWILLING_TO_PERFORM; } /* make sure that "sAMAccountType" is not specified */ el = ldb_msg_find_element(req->op.mod.message, "sAMAccountType"); if (el != NULL) { ldb_set_errstring(ldb, "samldb: sAMAccountType must not be specified!"); return LDB_ERR_UNWILLING_TO_PERFORM; } /* make sure that "isCriticalSystemObject" is not specified */ el = ldb_msg_find_element(req->op.mod.message, "isCriticalSystemObject"); if (el != NULL) { if (ldb_request_get_control(req, LDB_CONTROL_RELAX_OID) == NULL) { ldb_set_errstring(ldb, "samldb: isCriticalSystemObject must not be specified!"); return LDB_ERR_UNWILLING_TO_PERFORM; } } /* msDS-IntId is not allowed to be modified * except when modification comes from replication */ if (ldb_msg_find_element(req->op.mod.message, "msDS-IntId")) { if (!ldb_request_get_control(req, DSDB_CONTROL_REPLICATED_UPDATE_OID)) { return LDB_ERR_CONSTRAINT_VIOLATION; } } ac = samldb_ctx_init(module, req); if (ac == NULL) { return ldb_operr(ldb); } /* build the new msg */ ac->msg = ldb_msg_copy_shallow(ac, req->op.mod.message); if (ac->msg == NULL) { talloc_free(ac); ldb_debug(ldb, LDB_DEBUG_FATAL, "samldb_modify: ldb_msg_copy_shallow failed!\n"); return ldb_operr(ldb); } el = ldb_msg_find_element(ac->msg, "primaryGroupID"); if (el != NULL) { ret = samldb_prim_group_change(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "userAccountControl"); if (el != NULL) { modified = true; ret = samldb_user_account_control_change(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "groupType"); if (el != NULL) { modified = true; ret = samldb_group_type_change(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "sAMAccountName"); if (el != NULL) { ret = samldb_sam_accountname_check(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "member"); if (el != NULL) { ret = samldb_member_check(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "description"); if (el != NULL) { ret = samldb_description_check(ac); if (ret != LDB_SUCCESS) { return ret; } } el = ldb_msg_find_element(ac->msg, "dNSHostName"); el2 = ldb_msg_find_element(ac->msg, "sAMAccountName"); if ((el != NULL) || (el2 != NULL)) { modified = true; ret = samldb_service_principal_names_change(ac); if (ret != LDB_SUCCESS) { return ret; } } if (modified) { struct ldb_request *child_req; /* Now perform the real modifications as a child request */ ret = ldb_build_mod_req(&child_req, ldb, ac, ac->msg, req->controls, req, dsdb_next_callback, req); LDB_REQ_SET_LOCATION(child_req); if (ret != LDB_SUCCESS) { return ret; } return ldb_next_request(module, child_req); } talloc_free(ac); /* no change which interests us, go on */ return ldb_next_request(module, req); } /* delete */ static int samldb_prim_group_users_check(struct samldb_ctx *ac) { struct ldb_context *ldb; struct dom_sid *sid; uint32_t rid; NTSTATUS status; int ret; struct ldb_result *res; const char *attrs[] = { "objectSid", NULL }; const char *noattrs[] = { NULL }; ldb = ldb_module_get_ctx(ac->module); /* Finds out the SID/RID of the SAM object */ ret = dsdb_module_search_dn(ac->module, ac, &res, ac->req->op.del.dn, attrs, DSDB_FLAG_NEXT_MODULE); if (ret != LDB_SUCCESS) { return ret; } sid = samdb_result_dom_sid(ac, res->msgs[0], "objectSid"); if (sid == NULL) { /* No SID - it might not be a SAM object - therefore ok */ return LDB_SUCCESS; } status = dom_sid_split_rid(ac, sid, NULL, &rid); if (!NT_STATUS_IS_OK(status)) { return ldb_operr(ldb); } if (rid == 0) { /* Special object (security principal?) */ return LDB_SUCCESS; } /* Deny delete requests from groups which are primary ones */ ret = dsdb_module_search(ac->module, ac, &res, NULL, LDB_SCOPE_SUBTREE, noattrs, DSDB_FLAG_NEXT_MODULE, "(&(primaryGroupID=%u)(objectClass=user))", rid); if (ret != LDB_SUCCESS) { return ret; } if (res->count > 0) { return LDB_ERR_ENTRY_ALREADY_EXISTS; } return LDB_SUCCESS; } static int samldb_delete(struct ldb_module *module, struct ldb_request *req) { struct samldb_ctx *ac; int ret; if (ldb_dn_is_special(req->op.del.dn)) { /* do not manipulate our control entries */ return ldb_next_request(module, req); } ac = samldb_ctx_init(module, req); if (ac == NULL) { return ldb_operr(ldb_module_get_ctx(module)); } ret = samldb_prim_group_users_check(ac); if (ret != LDB_SUCCESS) { return ret; } talloc_free(ac); return ldb_next_request(module, req); } /* extended */ static int samldb_extended_allocate_rid_pool(struct ldb_module *module, struct ldb_request *req) { struct ldb_context *ldb = ldb_module_get_ctx(module); struct dsdb_fsmo_extended_op *exop; int ret; exop = talloc_get_type(req->op.extended.data, struct dsdb_fsmo_extended_op); if (!exop) { ldb_set_errstring(ldb, "samldb_extended_allocate_rid_pool: invalid extended data"); return LDB_ERR_PROTOCOL_ERROR; } ret = ridalloc_allocate_rid_pool_fsmo(module, exop); if (ret != LDB_SUCCESS) { return ret; } return ldb_module_done(req, NULL, NULL, LDB_SUCCESS); } static int samldb_extended(struct ldb_module *module, struct ldb_request *req) { if (strcmp(req->op.extended.oid, DSDB_EXTENDED_ALLOCATE_RID_POOL) == 0) { return samldb_extended_allocate_rid_pool(module, req); } return ldb_next_request(module, req); } static const struct ldb_module_ops ldb_samldb_module_ops = { .name = "samldb", .add = samldb_add, .modify = samldb_modify, .del = samldb_delete, .extended = samldb_extended }; int ldb_samldb_module_init(const char *version) { LDB_MODULE_CHECK_VERSION(version); return ldb_register_module(&ldb_samldb_module_ops); }