/* * Copyright (c) 1999-2001, 2003, PADL Software Pty Ltd. * Copyright (c) 2004, Andrew Bartlett . * Copyright (c) 2004, Stefan Metzmacher * All rights reserved. * * 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 PADL Software 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 BY PADL SOFTWARE AND CONTRIBUTORS ``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 PADL SOFTWARE 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 "includes.h" #include "system/time.h" #include "dsdb/common/flags.h" #include "lib/ldb/include/ldb.h" #include "lib/ldb/include/ldb_errors.h" #include "librpc/gen_ndr/netlogon.h" #include "auth/auth.h" #include "auth/credentials/credentials.h" #include "auth/auth_sam.h" #include "util/util_ldb.h" #include "dsdb/samdb/samdb.h" #include "librpc/ndr/libndr.h" #include "librpc/gen_ndr/ndr_drsblobs.h" #include "libcli/auth/libcli_auth.h" #include "param/param.h" #include "events/events.h" #include "kdc/kdc.h" enum hdb_ldb_ent_type { HDB_LDB_ENT_TYPE_CLIENT, HDB_LDB_ENT_TYPE_SERVER, HDB_LDB_ENT_TYPE_KRBTGT, HDB_LDB_ENT_TYPE_TRUST, HDB_LDB_ENT_TYPE_ANY }; static const char *realm_ref_attrs[] = { "nCName", "dnsRoot", NULL }; static const char *trust_attrs[] = { "trustPartner", "trustAuthIncoming", "trustAuthOutgoing", "whenCreated", NULL }; static KerberosTime ldb_msg_find_krb5time_ldap_time(struct ldb_message *msg, const char *attr, KerberosTime default_val) { const char *tmp; const char *gentime; struct tm tm; gentime = ldb_msg_find_attr_as_string(msg, attr, NULL); if (!gentime) return default_val; tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm); if (tmp == NULL) { return default_val; } return timegm(&tm); } static HDBFlags uf2HDBFlags(krb5_context context, int userAccountControl, enum hdb_ldb_ent_type ent_type) { HDBFlags flags = int2HDBFlags(0); /* we don't allow kadmin deletes */ flags.immutable = 1; /* mark the principal as invalid to start with */ flags.invalid = 1; flags.renewable = 1; /* All accounts are servers, but this may be disabled again in the caller */ flags.server = 1; /* Account types - clear the invalid bit if it turns out to be valid */ if (userAccountControl & UF_NORMAL_ACCOUNT) { if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) { flags.client = 1; } flags.invalid = 0; } if (userAccountControl & UF_INTERDOMAIN_TRUST_ACCOUNT) { if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) { flags.client = 1; } flags.invalid = 0; } if (userAccountControl & UF_WORKSTATION_TRUST_ACCOUNT) { if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) { flags.client = 1; } flags.invalid = 0; } if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) { if (ent_type == HDB_LDB_ENT_TYPE_CLIENT || ent_type == HDB_LDB_ENT_TYPE_ANY) { flags.client = 1; } flags.invalid = 0; } /* Not permitted to act as a client if disabled */ if (userAccountControl & UF_ACCOUNTDISABLE) { flags.client = 0; } if (userAccountControl & UF_LOCKOUT) { flags.invalid = 1; } /* if (userAccountControl & UF_PASSWORD_NOTREQD) { flags.invalid = 1; } */ /* UF_PASSWORD_CANT_CHANGE and UF_ENCRYPTED_TEXT_PASSWORD_ALLOWED are irrelevent */ if (userAccountControl & UF_TEMP_DUPLICATE_ACCOUNT) { flags.invalid = 1; } /* UF_DONT_EXPIRE_PASSWD and UF_USE_DES_KEY_ONLY handled in LDB_message2entry() */ /* if (userAccountControl & UF_MNS_LOGON_ACCOUNT) { flags.invalid = 1; } */ if (userAccountControl & UF_SMARTCARD_REQUIRED) { flags.require_hwauth = 1; } if (userAccountControl & UF_TRUSTED_FOR_DELEGATION) { flags.ok_as_delegate = 1; } if (!(userAccountControl & UF_NOT_DELEGATED)) { flags.forwardable = 1; flags.proxiable = 1; } if (userAccountControl & UF_DONT_REQUIRE_PREAUTH) { flags.require_preauth = 0; } else { flags.require_preauth = 1; } return flags; } static int hdb_ldb_destrutor(struct hdb_ldb_private *private) { hdb_entry_ex *entry_ex = private->entry_ex; free_hdb_entry(&entry_ex->entry); return 0; } static void hdb_ldb_free_entry(krb5_context context, hdb_entry_ex *entry_ex) { talloc_free(entry_ex->ctx); } static krb5_error_code LDB_message2entry_keys(krb5_context context, struct smb_iconv_convenience *iconv_convenience, TALLOC_CTX *mem_ctx, struct ldb_message *msg, unsigned int userAccountControl, hdb_entry_ex *entry_ex) { krb5_error_code ret = 0; enum ndr_err_code ndr_err; struct samr_Password *hash; const struct ldb_val *sc_val; struct supplementalCredentialsBlob scb; struct supplementalCredentialsPackage *scpk = NULL; bool newer_keys = false; struct package_PrimaryKerberosBlob _pkb; struct package_PrimaryKerberosCtr3 *pkb3 = NULL; struct package_PrimaryKerberosCtr4 *pkb4 = NULL; uint32_t i; uint32_t allocated_keys = 0; entry_ex->entry.keys.val = NULL; entry_ex->entry.keys.len = 0; entry_ex->entry.kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0); /* Get keys from the db */ hash = samdb_result_hash(mem_ctx, msg, "unicodePwd"); sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials"); /* unicodePwd for enctype 0x17 (23) if present */ if (hash) { allocated_keys++; } /* supplementalCredentials if present */ if (sc_val) { ndr_err = ndr_pull_struct_blob_all(sc_val, mem_ctx, iconv_convenience, &scb, (ndr_pull_flags_fn_t)ndr_pull_supplementalCredentialsBlob); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { dump_data(0, sc_val->data, sc_val->length); ret = EINVAL; goto out; } if (scb.sub.signature != SUPPLEMENTAL_CREDENTIALS_SIGNATURE) { NDR_PRINT_DEBUG(supplementalCredentialsBlob, &scb); ret = EINVAL; goto out; } for (i=0; i < scb.sub.num_packages; i++) { if (strcmp("Primary:Kerberos-Newer-Keys", scb.sub.packages[i].name) == 0) { scpk = &scb.sub.packages[i]; if (!scpk->data || !scpk->data[0]) { scpk = NULL; continue; } newer_keys = true; break; } else if (strcmp("Primary:Kerberos", scb.sub.packages[i].name) == 0) { scpk = &scb.sub.packages[i]; if (!scpk->data || !scpk->data[0]) { scpk = NULL; } /* * we don't break here in hope to find * a Kerberos-Newer-Keys package */ } } } /* * Primary:Kerberos-Newer-Keys or Primary:Kerberos element * of supplementalCredentials */ if (scpk) { DATA_BLOB blob; blob = strhex_to_data_blob(scpk->data); if (!blob.data) { ret = ENOMEM; goto out; } talloc_steal(mem_ctx, blob.data); /* we cannot use ndr_pull_struct_blob_all() here, as w2k and w2k3 add padding bytes */ ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, iconv_convenience, &_pkb, (ndr_pull_flags_fn_t)ndr_pull_package_PrimaryKerberosBlob); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { krb5_set_error_string(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob"); krb5_warnx(context, "LDB_message2entry_keys: could not parse package_PrimaryKerberosBlob"); ret = EINVAL; goto out; } if (newer_keys && _pkb.version != 4) { krb5_set_error_string(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4"); krb5_warnx(context, "LDB_message2entry_keys: Primary:Kerberos-Newer-Keys not version 4"); ret = EINVAL; goto out; } if (!newer_keys && _pkb.version != 3) { krb5_set_error_string(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3"); krb5_warnx(context, "LDB_message2entry_keys: could not parse Primary:Kerberos not version 3"); ret = EINVAL; goto out; } if (_pkb.version == 4) { pkb4 = &_pkb.ctr.ctr4; allocated_keys += pkb4->num_keys; } else if (_pkb.version == 3) { pkb3 = &_pkb.ctr.ctr3; allocated_keys += pkb3->num_keys; } } if (allocated_keys == 0) { /* oh, no password. Apparently (comment in * hdb-ldap.c) this violates the ASN.1, but this * allows an entry with no keys (yet). */ return 0; } /* allocate space to decode into */ entry_ex->entry.keys.len = 0; entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(Key)); if (entry_ex->entry.keys.val == NULL) { ret = ENOMEM; goto out; } if (hash && !(userAccountControl & UF_USE_DES_KEY_ONLY)) { Key key; key.mkvno = 0; key.salt = NULL; /* No salt for this enc type */ ret = krb5_keyblock_init(context, ENCTYPE_ARCFOUR_HMAC_MD5, hash->hash, sizeof(hash->hash), &key.key); if (ret) { goto out; } entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key; entry_ex->entry.keys.len++; } if (pkb4) { for (i=0; i < pkb4->num_keys; i++) { bool use = true; Key key; if (!pkb4->keys[i].value) continue; if (userAccountControl & UF_USE_DES_KEY_ONLY) { switch (pkb4->keys[i].keytype) { case ENCTYPE_DES_CBC_CRC: case ENCTYPE_DES_CBC_MD5: break; default: use = false; break; } } if (!use) continue; key.mkvno = 0; key.salt = NULL; if (pkb4->salt.string) { DATA_BLOB salt; salt = data_blob_string_const(pkb4->salt.string); key.salt = calloc(1, sizeof(*key.salt)); if (key.salt == NULL) { ret = ENOMEM; goto out; } key.salt->type = hdb_pw_salt; ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length); if (ret) { free(key.salt); key.salt = NULL; goto out; } } /* TODO: maybe pass the iteration_count somehow... */ ret = krb5_keyblock_init(context, pkb4->keys[i].keytype, pkb4->keys[i].value->data, pkb4->keys[i].value->length, &key.key); if (ret) { if (key.salt) { free_Salt(key.salt); free(key.salt); key.salt = NULL; } goto out; } entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key; entry_ex->entry.keys.len++; } } else if (pkb3) { for (i=0; i < pkb3->num_keys; i++) { bool use = true; Key key; if (!pkb3->keys[i].value) continue; if (userAccountControl & UF_USE_DES_KEY_ONLY) { switch (pkb3->keys[i].keytype) { case ENCTYPE_DES_CBC_CRC: case ENCTYPE_DES_CBC_MD5: break; default: use = false; break; } } if (!use) continue; key.mkvno = 0; key.salt = NULL; if (pkb3->salt.string) { DATA_BLOB salt; salt = data_blob_string_const(pkb3->salt.string); key.salt = calloc(1, sizeof(*key.salt)); if (key.salt == NULL) { ret = ENOMEM; goto out; } key.salt->type = hdb_pw_salt; ret = krb5_data_copy(&key.salt->salt, salt.data, salt.length); if (ret) { free(key.salt); key.salt = NULL; goto out; } } ret = krb5_keyblock_init(context, pkb3->keys[i].keytype, pkb3->keys[i].value->data, pkb3->keys[i].value->length, &key.key); if (ret) { if (key.salt) { free_Salt(key.salt); free(key.salt); key.salt = NULL; } goto out; } entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key; entry_ex->entry.keys.len++; } } out: if (ret != 0) { entry_ex->entry.keys.len = 0; } if (entry_ex->entry.keys.len == 0 && entry_ex->entry.keys.val) { free(entry_ex->entry.keys.val); entry_ex->entry.keys.val = NULL; } return ret; } /* * Construct an hdb_entry from a directory entry. */ static krb5_error_code LDB_message2entry(krb5_context context, HDB *db, TALLOC_CTX *mem_ctx, krb5_const_principal principal, enum hdb_ldb_ent_type ent_type, struct ldb_message *msg, struct ldb_message *realm_ref_msg, hdb_entry_ex *entry_ex) { unsigned int userAccountControl; int i; krb5_error_code ret = 0; krb5_boolean is_computer = FALSE; const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg, "dnsRoot", NULL); char *realm = strupper_talloc(mem_ctx, dnsdomain); struct loadparm_context *lp_ctx = ldb_get_opaque((struct ldb_context *)db->hdb_db, "loadparm"); struct ldb_dn *domain_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg, "nCName", ldb_dn_new(mem_ctx, (struct ldb_context *)db->hdb_db, NULL)); struct hdb_ldb_private *private; NTTIME acct_expiry; struct ldb_message_element *objectclasses; struct ldb_val computer_val; computer_val.data = discard_const_p(uint8_t,"computer"); computer_val.length = strlen((const char *)computer_val.data); objectclasses = ldb_msg_find_element(msg, "objectClass"); if (objectclasses && ldb_msg_find_val(objectclasses, &computer_val)) { is_computer = TRUE; } memset(entry_ex, 0, sizeof(*entry_ex)); if (!realm) { krb5_set_error_string(context, "talloc_strdup: out of memory"); ret = ENOMEM; goto out; } private = talloc(mem_ctx, struct hdb_ldb_private); if (!private) { ret = ENOMEM; goto out; } private->entry_ex = entry_ex; private->iconv_convenience = lp_iconv_convenience(lp_ctx); private->netbios_name = lp_netbios_name(lp_ctx); talloc_set_destructor(private, hdb_ldb_destrutor); entry_ex->ctx = private; entry_ex->free_entry = hdb_ldb_free_entry; userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0); entry_ex->entry.principal = malloc(sizeof(*(entry_ex->entry.principal))); if (ent_type == HDB_LDB_ENT_TYPE_ANY && principal == NULL) { const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL); if (!samAccountName) { krb5_set_error_string(context, "LDB_message2entry: no samAccountName present"); ret = ENOENT; goto out; } samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL); krb5_make_principal(context, &entry_ex->entry.principal, realm, samAccountName, NULL); } else { char *strdup_realm; ret = copy_Principal(principal, entry_ex->entry.principal); if (ret) { krb5_clear_error_string(context); goto out; } /* While we have copied the client principal, tests * show that Win2k3 returns the 'corrected' realm, not * the client-specified realm. This code attempts to * replace the client principal's realm with the one * we determine from our records */ /* this has to be with malloc() */ strdup_realm = strdup(realm); if (!strdup_realm) { ret = ENOMEM; krb5_clear_error_string(context); goto out; } free(*krb5_princ_realm(context, entry_ex->entry.principal)); krb5_princ_set_realm(context, entry_ex->entry.principal, &strdup_realm); } entry_ex->entry.flags = uf2HDBFlags(context, userAccountControl, ent_type); if (ent_type == HDB_LDB_ENT_TYPE_KRBTGT) { entry_ex->entry.flags.invalid = 0; entry_ex->entry.flags.server = 1; entry_ex->entry.flags.forwardable = 1; entry_ex->entry.flags.ok_as_delegate = 1; } if (lp_parm_bool(lp_ctx, NULL, "kdc", "require spn for service", true)) { if (!is_computer && !ldb_msg_find_attr_as_string(msg, "servicePrincipalName", NULL)) { entry_ex->entry.flags.server = 0; } } /* use 'whenCreated' */ entry_ex->entry.created_by.time = ldb_msg_find_krb5time_ldap_time(msg, "whenCreated", 0); /* use '???' */ entry_ex->entry.created_by.principal = NULL; entry_ex->entry.modified_by = (Event *) malloc(sizeof(Event)); if (entry_ex->entry.modified_by == NULL) { krb5_set_error_string(context, "malloc: out of memory"); ret = ENOMEM; goto out; } /* use 'whenChanged' */ entry_ex->entry.modified_by->time = ldb_msg_find_krb5time_ldap_time(msg, "whenChanged", 0); /* use '???' */ entry_ex->entry.modified_by->principal = NULL; entry_ex->entry.valid_start = NULL; acct_expiry = samdb_result_account_expires(msg); if (acct_expiry == 0x7FFFFFFFFFFFFFFFULL) { entry_ex->entry.valid_end = NULL; } else { entry_ex->entry.valid_end = malloc(sizeof(*entry_ex->entry.valid_end)); if (entry_ex->entry.valid_end == NULL) { ret = ENOMEM; goto out; } *entry_ex->entry.valid_end = nt_time_to_unix(acct_expiry); } if (ent_type != HDB_LDB_ENT_TYPE_KRBTGT) { NTTIME must_change_time = samdb_result_force_password_change((struct ldb_context *)db->hdb_db, mem_ctx, domain_dn, msg); if (must_change_time == 0x7FFFFFFFFFFFFFFFULL) { entry_ex->entry.pw_end = NULL; } else { entry_ex->entry.pw_end = malloc(sizeof(*entry_ex->entry.pw_end)); if (entry_ex->entry.pw_end == NULL) { ret = ENOMEM; goto out; } *entry_ex->entry.pw_end = nt_time_to_unix(must_change_time); } } else { entry_ex->entry.pw_end = NULL; } entry_ex->entry.max_life = NULL; entry_ex->entry.max_renew = NULL; entry_ex->entry.generation = NULL; /* Get keys from the db */ ret = LDB_message2entry_keys(context, private->iconv_convenience, private, msg, userAccountControl, entry_ex); if (ret) { /* Could be bougus data in the entry, or out of memory */ goto out; } entry_ex->entry.etypes = malloc(sizeof(*(entry_ex->entry.etypes))); if (entry_ex->entry.etypes == NULL) { krb5_clear_error_string(context); ret = ENOMEM; goto out; } entry_ex->entry.etypes->len = entry_ex->entry.keys.len; entry_ex->entry.etypes->val = calloc(entry_ex->entry.etypes->len, sizeof(int)); if (entry_ex->entry.etypes->val == NULL) { krb5_clear_error_string(context); ret = ENOMEM; goto out; } for (i=0; i < entry_ex->entry.etypes->len; i++) { entry_ex->entry.etypes->val[i] = entry_ex->entry.keys.val[i].key.keytype; } private->msg = talloc_steal(private, msg); private->realm_ref_msg = talloc_steal(private, realm_ref_msg); private->samdb = (struct ldb_context *)db->hdb_db; out: if (ret != 0) { /* This doesn't free ent itself, that is for the eventual caller to do */ hdb_free_entry(context, entry_ex); } else { talloc_steal(db, entry_ex->ctx); } return ret; } static krb5_error_code LDB_lookup_principal(krb5_context context, struct ldb_context *ldb_ctx, TALLOC_CTX *mem_ctx, krb5_const_principal principal, enum hdb_ldb_ent_type ent_type, struct ldb_dn *realm_dn, struct ldb_message ***pmsg) { krb5_error_code ret; int lret; char *filter = NULL; const char * const *princ_attrs = user_attrs; char *short_princ; char *short_princ_talloc; struct ldb_result *res = NULL; ret = krb5_unparse_name_flags(context, principal, KRB5_PRINCIPAL_UNPARSE_NO_REALM, &short_princ); if (ret != 0) { krb5_set_error_string(context, "LDB_lookup_principal: could not parse principal"); krb5_warnx(context, "LDB_lookup_principal: could not parse principal"); return ret; } short_princ_talloc = talloc_strdup(mem_ctx, short_princ); free(short_princ); if (!short_princ_talloc) { krb5_set_error_string(context, "LDB_lookup_principal: talloc_strdup() failed!"); return ENOMEM; } switch (ent_type) { case HDB_LDB_ENT_TYPE_CLIENT: /* Can't happen */ return EINVAL; case HDB_LDB_ENT_TYPE_ANY: /* Can't happen */ return EINVAL; case HDB_LDB_ENT_TYPE_KRBTGT: filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))", KRB5_TGS_NAME); break; case HDB_LDB_ENT_TYPE_SERVER: filter = talloc_asprintf(mem_ctx, "(&(objectClass=user)(samAccountName=%s))", short_princ_talloc); break; } if (!filter) { krb5_set_error_string(context, "talloc_asprintf: out of memory"); return ENOMEM; } lret = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_SUBTREE, filter, princ_attrs, &res); if (lret != LDB_SUCCESS) { DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx))); return HDB_ERR_NOENTRY; } else if (res->count == 0 || res->count > 1) { DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count)); talloc_free(res); return HDB_ERR_NOENTRY; } talloc_steal(mem_ctx, res->msgs); *pmsg = res->msgs; talloc_free(res); return 0; } static krb5_error_code LDB_lookup_trust(krb5_context context, struct ldb_context *ldb_ctx, TALLOC_CTX *mem_ctx, const char *realm, enum hdb_ldb_ent_type ent_type, struct ldb_dn *realm_dn, struct ldb_message ***pmsg) { int lret; char *filter = NULL; const char * const *attrs = trust_attrs; struct ldb_result *res = NULL; filter = talloc_asprintf(mem_ctx, "(&(objectClass=trustedDomain)(|(flatname=%s)(trustPartner=%s)))", realm, realm); if (!filter) { krb5_set_error_string(context, "talloc_asprintf: out of memory"); return ENOMEM; } lret = ldb_search(ldb_ctx, ldb_get_default_basedn(ldb_ctx), LDB_SCOPE_SUBTREE, filter, attrs, &res); if (lret != LDB_SUCCESS) { DEBUG(3, ("Failed to search for %s: %s\n", filter, ldb_errstring(ldb_ctx))); return HDB_ERR_NOENTRY; } else if (res->count == 0 || res->count > 1) { DEBUG(3, ("Failed find a single entry for %s: got %d\n", filter, res->count)); talloc_free(res); return HDB_ERR_NOENTRY; } talloc_steal(mem_ctx, res->msgs); *pmsg = res->msgs; talloc_free(res); return 0; } static krb5_error_code LDB_lookup_realm(krb5_context context, struct ldb_context *ldb_ctx, TALLOC_CTX *mem_ctx, const char *realm, struct ldb_message ***pmsg) { int ret; struct ldb_result *cross_ref_res; struct ldb_dn *partitions_basedn = samdb_partitions_dn(ldb_ctx, mem_ctx); ret = ldb_search_exp_fmt(ldb_ctx, mem_ctx, &cross_ref_res, partitions_basedn, LDB_SCOPE_SUBTREE, realm_ref_attrs, "(&(&(|(&(dnsRoot=%s)(nETBIOSName=*))(nETBIOSName=%s))(objectclass=crossRef))(ncName=*))", realm, realm); if (ret != LDB_SUCCESS) { DEBUG(3, ("Failed to search to lookup realm(%s): %s\n", realm, ldb_errstring(ldb_ctx))); talloc_free(cross_ref_res); return HDB_ERR_NOENTRY; } else if (cross_ref_res->count == 0 || cross_ref_res->count > 1) { DEBUG(3, ("Failed find a single entry for realm %s: got %d\n", realm, cross_ref_res->count)); talloc_free(cross_ref_res); return HDB_ERR_NOENTRY; } if (pmsg) { *pmsg = cross_ref_res->msgs; talloc_steal(mem_ctx, cross_ref_res->msgs); } talloc_free(cross_ref_res); return 0; } static krb5_error_code LDB_open(krb5_context context, HDB *db, int flags, mode_t mode) { if (db->hdb_master_key_set) { krb5_warnx(context, "LDB_open: use of a master key incompatible with LDB\n"); krb5_set_error_string(context, "LDB_open: use of a master key incompatible with LDB\n"); return HDB_ERR_NOENTRY; } return 0; } static krb5_error_code LDB_close(krb5_context context, HDB *db) { return 0; } static krb5_error_code LDB_lock(krb5_context context, HDB *db, int operation) { return 0; } static krb5_error_code LDB_unlock(krb5_context context, HDB *db) { return 0; } static krb5_error_code LDB_rename(krb5_context context, HDB *db, const char *new_name) { return HDB_ERR_DB_INUSE; } static krb5_error_code LDB_fetch_client(krb5_context context, HDB *db, TALLOC_CTX *mem_ctx, krb5_const_principal principal, unsigned flags, hdb_entry_ex *entry_ex) { NTSTATUS nt_status; char *principal_string; krb5_error_code ret; struct ldb_message **msg = NULL; struct ldb_message **realm_ref_msg = NULL; ret = krb5_unparse_name(context, principal, &principal_string); if (ret != 0) { return ret; } nt_status = sam_get_results_principal((struct ldb_context *)db->hdb_db, mem_ctx, principal_string, &msg, &realm_ref_msg); free(principal_string); if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) { return HDB_ERR_NOENTRY; } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) { return ENOMEM; } else if (!NT_STATUS_IS_OK(nt_status)) { return EINVAL; } ret = LDB_message2entry(context, db, mem_ctx, principal, HDB_LDB_ENT_TYPE_CLIENT, msg[0], realm_ref_msg[0], entry_ex); return ret; } static krb5_error_code LDB_fetch_krbtgt(krb5_context context, HDB *db, TALLOC_CTX *mem_ctx, krb5_const_principal principal, unsigned flags, hdb_entry_ex *entry_ex) { krb5_error_code ret; struct ldb_message **msg = NULL; struct ldb_message **realm_ref_msg_1 = NULL; struct ldb_message **realm_ref_msg_2 = NULL; struct ldb_dn *realm_dn; const char *realm; krb5_principal alloc_principal = NULL; if (principal->name.name_string.len != 2 || (strcmp(principal->name.name_string.val[0], KRB5_TGS_NAME) != 0)) { /* Not a krbtgt */ return HDB_ERR_NOENTRY; } /* krbtgt case. Either us or a trusted realm */ if ((LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, mem_ctx, principal->realm, &realm_ref_msg_1) == 0) && (LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, mem_ctx, principal->name.name_string.val[1], &realm_ref_msg_2) == 0) && (ldb_dn_compare(realm_ref_msg_1[0]->dn, realm_ref_msg_1[0]->dn) == 0)) { /* us */ /* Cludge, cludge cludge. If the realm part of krbtgt/realm, * is in our db, then direct the caller at our primary * krbtgt */ const char *dnsdomain = ldb_msg_find_attr_as_string(realm_ref_msg_1[0], "dnsRoot", NULL); char *realm_fixed = strupper_talloc(mem_ctx, dnsdomain); if (!realm_fixed) { krb5_set_error_string(context, "strupper_talloc: out of memory"); return ENOMEM; } ret = krb5_copy_principal(context, principal, &alloc_principal); if (ret) { return ret; } free(alloc_principal->name.name_string.val[1]); alloc_principal->name.name_string.val[1] = strdup(realm_fixed); talloc_free(realm_fixed); if (!alloc_principal->name.name_string.val[1]) { krb5_set_error_string(context, "LDB_fetch: strdup() failed!"); return ENOMEM; } principal = alloc_principal; realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg_1[0], "nCName", NULL); ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db, mem_ctx, principal, HDB_LDB_ENT_TYPE_KRBTGT, realm_dn, &msg); if (ret != 0) { krb5_warnx(context, "LDB_fetch: could not find principal in DB"); krb5_set_error_string(context, "LDB_fetch: could not find principal in DB"); return ret; } ret = LDB_message2entry(context, db, mem_ctx, principal, HDB_LDB_ENT_TYPE_KRBTGT, msg[0], realm_ref_msg_1[0], entry_ex); if (ret != 0) { krb5_warnx(context, "LDB_fetch: message2entry failed"); } return ret; } else { enum { INBOUND, OUTBOUND, UNKNOWN } direction = UNKNOWN; struct loadparm_context *lp_ctx = talloc_get_type(ldb_get_opaque(db->hdb_db, "loadparm"), struct loadparm_context); /* Either an inbound or outbound trust */ if (strcasecmp(lp_realm(lp_ctx), principal->realm) == 0) { /* look for inbound trust */ direction = INBOUND; realm = principal->name.name_string.val[1]; } if (strcasecmp(lp_realm(lp_ctx), principal->name.name_string.val[1]) == 0) { /* look for outbound trust */ direction = OUTBOUND; realm = principal->realm; } /* Trusted domains are under CN=system */ ret = LDB_lookup_trust(context, (struct ldb_context *)db->hdb_db, mem_ctx, realm, HDB_LDB_ENT_TYPE_TRUST, realm_dn, &msg); if (ret != 0) { krb5_warnx(context, "LDB_fetch: could not find principal in DB"); krb5_set_error_string(context, "LDB_fetch: could not find principal in DB"); return ret; } ret = LDB_message2entry(context, db, mem_ctx, principal, HDB_LDB_ENT_TYPE_KRBTGT, msg[0], realm_ref_msg_1[0], entry_ex); if (ret != 0) { krb5_warnx(context, "LDB_fetch: message2entry failed"); } return ret; /* we should lookup trusted domains */ return HDB_ERR_NOENTRY; } } static krb5_error_code LDB_fetch_server(krb5_context context, HDB *db, TALLOC_CTX *mem_ctx, krb5_const_principal principal, unsigned flags, hdb_entry_ex *entry_ex) { krb5_error_code ret; const char *realm; struct ldb_message **msg = NULL; struct ldb_message **realm_ref_msg = NULL; struct ldb_dn *partitions_basedn = samdb_partitions_dn(db->hdb_db, mem_ctx); if (principal->name.name_string.len >= 2) { /* 'normal server' case */ int ldb_ret; NTSTATUS nt_status; struct ldb_dn *user_dn, *domain_dn; char *principal_string; ret = krb5_unparse_name_flags(context, principal, KRB5_PRINCIPAL_UNPARSE_NO_REALM, &principal_string); if (ret != 0) { return ret; } /* At this point we may find the host is known to be * in a different realm, so we should generate a * referral instead */ nt_status = crack_service_principal_name((struct ldb_context *)db->hdb_db, mem_ctx, principal_string, &user_dn, &domain_dn); free(principal_string); if (!NT_STATUS_IS_OK(nt_status)) { return HDB_ERR_NOENTRY; } ldb_ret = gendb_search_dn((struct ldb_context *)db->hdb_db, mem_ctx, user_dn, &msg, user_attrs); if (ldb_ret != 1) { return HDB_ERR_NOENTRY; } ldb_ret = gendb_search((struct ldb_context *)db->hdb_db, mem_ctx, partitions_basedn, &realm_ref_msg, realm_ref_attrs, "ncName=%s", ldb_dn_get_linearized(domain_dn)); if (ldb_ret != 1) { return HDB_ERR_NOENTRY; } } else { struct ldb_dn *realm_dn; /* server as client principal case, but we must not lookup userPrincipalNames */ realm = krb5_principal_get_realm(context, principal); ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, mem_ctx, realm, &realm_ref_msg); if (ret != 0) { return HDB_ERR_NOENTRY; } realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msg[0], "nCName", NULL); ret = LDB_lookup_principal(context, (struct ldb_context *)db->hdb_db, mem_ctx, principal, HDB_LDB_ENT_TYPE_SERVER, realm_dn, &msg); if (ret != 0) { return ret; } } ret = LDB_message2entry(context, db, mem_ctx, principal, HDB_LDB_ENT_TYPE_SERVER, msg[0], realm_ref_msg[0], entry_ex); if (ret != 0) { krb5_warnx(context, "LDB_fetch: message2entry failed"); } return ret; } static krb5_error_code LDB_fetch(krb5_context context, HDB *db, krb5_const_principal principal, unsigned flags, hdb_entry_ex *entry_ex) { krb5_error_code ret = HDB_ERR_NOENTRY; TALLOC_CTX *mem_ctx = talloc_named(db, 0, "LDB_fetch context"); if (!mem_ctx) { krb5_set_error_string(context, "LDB_fetch: talloc_named() failed!"); return ENOMEM; } if (flags & HDB_F_GET_CLIENT) { ret = LDB_fetch_client(context, db, mem_ctx, principal, flags, entry_ex); if (ret != HDB_ERR_NOENTRY) goto done; } if (flags & HDB_F_GET_SERVER) { /* krbtgt fits into this situation for trusted realms, and for resolving different versions of our own realm name */ ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex); if (ret != HDB_ERR_NOENTRY) goto done; /* We return 'no entry' if it does not start with krbtgt/, so move to the common case quickly */ ret = LDB_fetch_server(context, db, mem_ctx, principal, flags, entry_ex); if (ret != HDB_ERR_NOENTRY) goto done; } if (flags & HDB_F_GET_KRBTGT) { ret = LDB_fetch_krbtgt(context, db, mem_ctx, principal, flags, entry_ex); if (ret != HDB_ERR_NOENTRY) goto done; } done: talloc_free(mem_ctx); return ret; } static krb5_error_code LDB_store(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry) { return HDB_ERR_DB_INUSE; } static krb5_error_code LDB_remove(krb5_context context, HDB *db, krb5_const_principal principal) { return HDB_ERR_DB_INUSE; } struct hdb_ldb_seq { struct ldb_context *ctx; int index; int count; struct ldb_message **msgs; struct ldb_message **realm_ref_msgs; }; static krb5_error_code LDB_seq(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry) { krb5_error_code ret; struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc; TALLOC_CTX *mem_ctx; hdb_entry_ex entry_ex; memset(&entry_ex, '\0', sizeof(entry_ex)); if (!priv) { return HDB_ERR_NOENTRY; } mem_ctx = talloc_named(priv, 0, "LDB_seq context"); if (!mem_ctx) { krb5_set_error_string(context, "LDB_seq: talloc_named() failed!"); return ENOMEM; } if (priv->index < priv->count) { ret = LDB_message2entry(context, db, mem_ctx, NULL, HDB_LDB_ENT_TYPE_ANY, priv->msgs[priv->index++], priv->realm_ref_msgs[0], entry); } else { ret = HDB_ERR_NOENTRY; } if (ret != 0) { talloc_free(priv); db->hdb_dbc = NULL; } else { talloc_free(mem_ctx); } return ret; } static krb5_error_code LDB_firstkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry) { struct ldb_context *ldb_ctx = (struct ldb_context *)db->hdb_db; struct hdb_ldb_seq *priv = (struct hdb_ldb_seq *)db->hdb_dbc; char *realm; struct ldb_dn *realm_dn = NULL; struct ldb_result *res = NULL; struct ldb_message **realm_ref_msgs = NULL; krb5_error_code ret; TALLOC_CTX *mem_ctx; int lret; if (priv) { talloc_free(priv); db->hdb_dbc = NULL; } priv = (struct hdb_ldb_seq *) talloc(db, struct hdb_ldb_seq); if (!priv) { krb5_set_error_string(context, "talloc: out of memory"); return ENOMEM; } priv->ctx = ldb_ctx; priv->index = 0; priv->msgs = NULL; priv->realm_ref_msgs = NULL; priv->count = 0; mem_ctx = talloc_named(priv, 0, "LDB_firstkey context"); if (!mem_ctx) { krb5_set_error_string(context, "LDB_firstkey: talloc_named() failed!"); return ENOMEM; } ret = krb5_get_default_realm(context, &realm); if (ret != 0) { talloc_free(priv); return ret; } ret = LDB_lookup_realm(context, (struct ldb_context *)db->hdb_db, mem_ctx, realm, &realm_ref_msgs); free(realm); if (ret != 0) { talloc_free(priv); krb5_warnx(context, "LDB_firstkey: could not find realm\n"); return HDB_ERR_NOENTRY; } realm_dn = samdb_result_dn((struct ldb_context *)db->hdb_db, mem_ctx, realm_ref_msgs[0], "nCName", NULL); priv->realm_ref_msgs = talloc_steal(priv, realm_ref_msgs); lret = ldb_search(ldb_ctx, realm_dn, LDB_SCOPE_SUBTREE, "(objectClass=user)", user_attrs, &res); if (lret != LDB_SUCCESS) { talloc_free(priv); return HDB_ERR_NOENTRY; } priv->count = res->count; priv->msgs = talloc_steal(priv, res->msgs); talloc_free(res); db->hdb_dbc = priv; ret = LDB_seq(context, db, flags, entry); if (ret != 0) { talloc_free(priv); db->hdb_dbc = NULL; } else { talloc_free(mem_ctx); } return ret; } static krb5_error_code LDB_nextkey(krb5_context context, HDB *db, unsigned flags, hdb_entry_ex *entry) { return LDB_seq(context, db, flags, entry); } static krb5_error_code LDB_destroy(krb5_context context, HDB *db) { talloc_free(db); return 0; } /* This interface is to be called by the KDC, which is expecting Samba * calling conventions. It is also called by a wrapper * (hdb_ldb_create) from the kpasswdd -> krb5 -> keytab_hdb -> hdb * code */ NTSTATUS kdc_hdb_ldb_create(TALLOC_CTX *mem_ctx, struct event_context *ev_ctx, struct loadparm_context *lp_ctx, krb5_context context, struct HDB **db, const char *arg) { NTSTATUS nt_status; struct auth_session_info *session_info; *db = talloc(mem_ctx, HDB); if (!*db) { krb5_set_error_string(context, "malloc: out of memory"); return NT_STATUS_NO_MEMORY; } (*db)->hdb_master_key_set = 0; (*db)->hdb_db = NULL; nt_status = auth_system_session_info(*db, lp_ctx, &session_info); if (!NT_STATUS_IS_OK(nt_status)) { return nt_status; } /* The idea here is very simple. Using Kerberos to * authenticate the KDC to the LDAP server is higly likely to * be circular. * * In future we may set this up to use EXERNAL and SSL * certificates, for now it will almost certainly be NTLMSSP */ cli_credentials_set_kerberos_state(session_info->credentials, CRED_DONT_USE_KERBEROS); /* Setup the link to LDB */ (*db)->hdb_db = samdb_connect(*db, ev_ctx, lp_ctx, session_info); if ((*db)->hdb_db == NULL) { DEBUG(1, ("hdb_ldb_create: Cannot open samdb for KDC backend!")); return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; } (*db)->hdb_dbc = NULL; (*db)->hdb_open = LDB_open; (*db)->hdb_close = LDB_close; (*db)->hdb_fetch = LDB_fetch; (*db)->hdb_store = LDB_store; (*db)->hdb_remove = LDB_remove; (*db)->hdb_firstkey = LDB_firstkey; (*db)->hdb_nextkey = LDB_nextkey; (*db)->hdb_lock = LDB_lock; (*db)->hdb_unlock = LDB_unlock; (*db)->hdb_rename = LDB_rename; /* we don't implement these, as we are not a lockable database */ (*db)->hdb__get = NULL; (*db)->hdb__put = NULL; /* kadmin should not be used for deletes - use other tools instead */ (*db)->hdb__del = NULL; (*db)->hdb_destroy = LDB_destroy; return NT_STATUS_OK; } krb5_error_code hdb_ldb_create(krb5_context context, struct HDB **db, const char *arg) { NTSTATUS nt_status; /* The global kdc_mem_ctx and kdc_lp_ctx, Disgusting, ugly hack, but it means one less private hook */ nt_status = kdc_hdb_ldb_create(kdc_mem_ctx, event_context_find(kdc_mem_ctx), kdc_lp_ctx, context, db, arg); if (NT_STATUS_IS_OK(nt_status)) { return 0; } return EINVAL; }