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https://github.com/samba-team/samba.git
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7a7dbdb773
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
1233 lines
33 KiB
C
1233 lines
33 KiB
C
/*
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Unix SMB/CIFS implementation.
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Password and authentication handling
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2009
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Copyright (C) Gerald Carter 2003
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Copyright (C) Stefan Metzmacher 2005-2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/time.h"
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#include <ldb.h>
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#include "libcli/ldap/ldap_ndr.h"
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#include "libcli/security/security.h"
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#include "auth/auth.h"
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#include "../libcli/auth/ntlm_check.h"
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#include "auth/ntlm/auth_proto.h"
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#include "auth/auth_sam.h"
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#include "dsdb/samdb/samdb.h"
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#include "dsdb/common/util.h"
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#include "param/param.h"
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#include "librpc/gen_ndr/ndr_irpc_c.h"
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#include "librpc/gen_ndr/ndr_winbind_c.h"
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#include "lib/messaging/irpc.h"
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#include "libcli/auth/libcli_auth.h"
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#include "libds/common/roles.h"
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#include "lib/util/tevent_ntstatus.h"
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#include "system/kerberos.h"
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#include "auth/kerberos/kerberos.h"
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#include "kdc/authn_policy_util.h"
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#include "kdc/db-glue.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_AUTH
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NTSTATUS auth_sam_init(void);
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extern const char *user_attrs[];
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extern const char *domain_ref_attrs[];
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/****************************************************************************
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Do a specific test for an smb password being correct, given a smb_password and
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the lanman and NT responses.
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****************************************************************************/
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static NTSTATUS authsam_password_ok(struct auth4_context *auth_context,
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TALLOC_CTX *mem_ctx,
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const struct samr_Password *nt_pwd,
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struct smb_krb5_context *smb_krb5_context,
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const DATA_BLOB *stored_aes_256_key,
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const krb5_data *salt,
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const struct auth_usersupplied_info *user_info,
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DATA_BLOB *user_sess_key,
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DATA_BLOB *lm_sess_key)
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{
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NTSTATUS status;
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switch (user_info->password_state) {
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case AUTH_PASSWORD_PLAIN:
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{
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const struct auth_usersupplied_info *user_info_temp;
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if (nt_pwd == NULL && stored_aes_256_key != NULL && user_info->password.plaintext != NULL) {
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bool pw_equal;
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int krb5_ret;
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DATA_BLOB supplied_aes_256_key;
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krb5_keyblock key;
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krb5_data cleartext_data = {
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.data = user_info->password.plaintext,
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.length = strlen(user_info->password.plaintext)
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};
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*lm_sess_key = data_blob_null;
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*user_sess_key = data_blob_null;
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krb5_ret = smb_krb5_create_key_from_string(smb_krb5_context->krb5_context,
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NULL,
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salt,
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&cleartext_data,
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ENCTYPE_AES256_CTS_HMAC_SHA1_96,
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&key);
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if (krb5_ret) {
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DBG_ERR("generation of a aes256-cts-hmac-sha1-96 key for password comparison failed: %s\n",
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smb_get_krb5_error_message(smb_krb5_context->krb5_context,
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krb5_ret, mem_ctx));
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return NT_STATUS_INTERNAL_ERROR;
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}
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supplied_aes_256_key = data_blob_const(KRB5_KEY_DATA(&key),
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KRB5_KEY_LENGTH(&key));
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pw_equal = data_blob_equal_const_time(&supplied_aes_256_key,
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stored_aes_256_key);
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krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &key);
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if (!pw_equal) {
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return NT_STATUS_WRONG_PASSWORD;
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}
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return NT_STATUS_OK;
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}
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status = encrypt_user_info(mem_ctx, auth_context,
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AUTH_PASSWORD_HASH,
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user_info, &user_info_temp);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
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return status;
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}
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user_info = user_info_temp;
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FALL_THROUGH;
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}
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case AUTH_PASSWORD_HASH:
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*lm_sess_key = data_blob(NULL, 0);
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*user_sess_key = data_blob(NULL, 0);
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status = hash_password_check(mem_ctx,
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false,
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lpcfg_ntlm_auth(auth_context->lp_ctx),
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NULL,
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user_info->password.hash.nt,
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user_info->mapped.account_name,
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NULL, nt_pwd);
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NT_STATUS_NOT_OK_RETURN(status);
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break;
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case AUTH_PASSWORD_RESPONSE:
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status = ntlm_password_check(mem_ctx,
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false,
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lpcfg_ntlm_auth(auth_context->lp_ctx),
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user_info->logon_parameters,
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&auth_context->challenge.data,
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&user_info->password.response.lanman,
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&user_info->password.response.nt,
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user_info->mapped.account_name,
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user_info->client.account_name,
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user_info->client.domain_name,
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NULL, nt_pwd,
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user_sess_key, lm_sess_key);
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NT_STATUS_NOT_OK_RETURN(status);
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break;
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}
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return NT_STATUS_OK;
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}
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static void auth_sam_trigger_zero_password(TALLOC_CTX *mem_ctx,
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struct imessaging_context *msg_ctx,
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struct tevent_context *event_ctx,
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struct netr_SendToSamBase *send_to_sam)
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{
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struct dcerpc_binding_handle *irpc_handle;
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struct winbind_SendToSam r;
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struct tevent_req *req;
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TALLOC_CTX *tmp_ctx;
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tmp_ctx = talloc_new(mem_ctx);
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if (tmp_ctx == NULL) {
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return;
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}
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irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
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"winbind_server",
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&ndr_table_winbind);
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if (irpc_handle == NULL) {
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DEBUG(1,(__location__ ": Unable to get binding handle for winbind\n"));
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TALLOC_FREE(tmp_ctx);
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return;
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}
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r.in.message = *send_to_sam;
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/*
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* This seem to rely on the current IRPC implementation,
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* which delivers the message in the _send function.
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*
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* TODO: we need a ONE_WAY IRPC handle and register
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* a callback and wait for it to be triggered!
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*/
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req = dcerpc_winbind_SendToSam_r_send(tmp_ctx,
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event_ctx,
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irpc_handle,
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&r);
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/* we aren't interested in a reply */
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talloc_free(req);
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TALLOC_FREE(tmp_ctx);
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}
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/*
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send a message to the drepl server telling it to initiate a
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REPL_SECRET getncchanges extended op to fetch the users secrets
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*/
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static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
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struct imessaging_context *msg_ctx,
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struct tevent_context *event_ctx,
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struct ldb_dn *user_dn)
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{
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struct dcerpc_binding_handle *irpc_handle;
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struct drepl_trigger_repl_secret r;
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struct tevent_req *req;
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TALLOC_CTX *tmp_ctx;
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tmp_ctx = talloc_new(mem_ctx);
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if (tmp_ctx == NULL) {
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return;
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}
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irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
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"dreplsrv",
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&ndr_table_irpc);
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if (irpc_handle == NULL) {
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DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
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TALLOC_FREE(tmp_ctx);
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return;
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}
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r.in.user_dn = ldb_dn_get_linearized(user_dn);
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/*
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* This seem to rely on the current IRPC implementation,
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* which delivers the message in the _send function.
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*
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* TODO: we need a ONE_WAY IRPC handle and register
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* a callback and wait for it to be triggered!
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*/
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req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
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event_ctx,
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irpc_handle,
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&r);
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/* we aren't interested in a reply */
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talloc_free(req);
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TALLOC_FREE(tmp_ctx);
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}
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static const struct samr_Password *hide_invalid_nthash(const struct samr_Password *in)
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{
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/*
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* This is the result of:
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*
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* E_md4hash("", zero_string_hash.hash);
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*/
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static const struct samr_Password zero_string_hash = {
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.hash = {
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0x31, 0xd6, 0xcf, 0xe0, 0xd1, 0x6a, 0xe9, 0x31,
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0xb7, 0x3c, 0x59, 0xd7, 0xe0, 0xc0, 0x89, 0xc0,
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}
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};
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if (in == NULL) {
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return NULL;
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}
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/*
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* Skip over any all-zero hashes in the history. No known software
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* stores these but just to be sure
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*/
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if (all_zero(in->hash, sizeof(in->hash))) {
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return NULL;
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}
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/*
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* This looks odd, but the password_hash module in the past has written
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* this in the rare situation where (somehow) we didn't have an old NT
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* hash (one of the old LM-only set paths)
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*
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* mem_equal_const_time() is used to avoid a timing attack
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* when comparing secret data in the server with this constant
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* value.
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*/
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if (mem_equal_const_time(in->hash, zero_string_hash.hash, 16)) {
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in = NULL;
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}
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return in;
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}
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/*
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* Check that a password is OK, and update badPwdCount if required.
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*/
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static NTSTATUS authsam_password_check_and_record(struct auth4_context *auth_context,
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TALLOC_CTX *mem_ctx,
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struct ldb_dn *domain_dn,
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struct ldb_message *msg,
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const struct auth_usersupplied_info *user_info,
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DATA_BLOB *user_sess_key,
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DATA_BLOB *lm_sess_key,
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bool *authoritative)
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{
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NTSTATUS nt_status;
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NTSTATUS auth_status;
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TALLOC_CTX *tmp_ctx;
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int i, ret;
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int history_len = 0;
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struct ldb_context *sam_ctx = auth_context->sam_ctx;
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const char * const attrs[] = { "pwdHistoryLength", NULL };
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struct ldb_message *dom_msg;
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struct samr_Password *nt_pwd;
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DATA_BLOB _aes_256_key = data_blob_null;
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DATA_BLOB *aes_256_key = NULL;
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krb5_data _salt = { .data = NULL, .length = 0 };
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krb5_data *salt = NULL;
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DATA_BLOB salt_data = data_blob_null;
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struct smb_krb5_context *smb_krb5_context = NULL;
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const struct ldb_val *sc_val;
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uint32_t userAccountControl = 0;
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uint32_t current_kvno = 0;
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bool am_rodc;
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tmp_ctx = talloc_new(mem_ctx);
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if (tmp_ctx == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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/*
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* This call does more than what it appears to do, it also
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* checks for the account lockout.
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*
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* It is done here so that all parts of Samba that read the
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* password refuse to even operate on it if the account is
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* locked out, to avoid mistakes like CVE-2013-4496.
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*/
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nt_status = samdb_result_passwords(tmp_ctx, auth_context->lp_ctx,
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msg, &nt_pwd);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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userAccountControl = ldb_msg_find_attr_as_uint(msg,
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"userAccountControl",
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0);
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sc_val = ldb_msg_find_ldb_val(msg, "supplementalCredentials");
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if (nt_pwd == NULL && sc_val == NULL) {
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if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
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/*
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* we don't have passwords for this
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* account. We are an RODC, and this account
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* may be one for which we either are denied
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* REPL_SECRET replication or we haven't yet
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* done the replication. We return
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* NT_STATUS_NOT_IMPLEMENTED which tells the
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* auth code to try the next authentication
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* mechanism. We also send a message to our
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* drepl server to tell it to try and
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* replicate the secrets for this account.
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*
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* TODO: Should we only trigger this is detected
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* there's a chance that the password might be
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* replicated, we should be able to detect this
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* based on msDS-NeverRevealGroup.
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*/
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auth_sam_trigger_repl_secret(auth_context,
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auth_context->msg_ctx,
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auth_context->event_ctx,
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msg->dn);
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NOT_IMPLEMENTED;
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}
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}
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/*
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* If we don't have an NT password, pull a kerberos key
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* instead for plaintext.
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*/
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if (nt_pwd == NULL &&
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sc_val != NULL &&
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user_info->password_state == AUTH_PASSWORD_PLAIN)
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{
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krb5_error_code krb5_ret;
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krb5_ret = smb_krb5_init_context(tmp_ctx,
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auth_context->lp_ctx,
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&smb_krb5_context);
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if (krb5_ret != 0) {
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DBG_ERR("Failed to setup krb5_context: %s!\n",
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error_message(krb5_ret));
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return NT_STATUS_INTERNAL_ERROR;
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}
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/*
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* Get the current salt from the record
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*/
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krb5_ret = dsdb_extract_aes_256_key(smb_krb5_context->krb5_context,
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tmp_ctx,
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msg,
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userAccountControl,
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NULL, /* kvno */
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¤t_kvno, /* kvno_out */
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&_aes_256_key,
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&salt_data);
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if (krb5_ret == 0) {
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aes_256_key = &_aes_256_key;
|
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_salt.data = (char *)salt_data.data;
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_salt.length = salt_data.length;
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salt = &_salt;
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}
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}
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auth_status = authsam_password_ok(auth_context,
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tmp_ctx,
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nt_pwd,
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smb_krb5_context,
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aes_256_key,
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salt,
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user_info,
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user_sess_key, lm_sess_key);
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if (NT_STATUS_IS_OK(auth_status)) {
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if (user_sess_key->data) {
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talloc_steal(mem_ctx, user_sess_key->data);
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}
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if (lm_sess_key->data) {
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talloc_steal(mem_ctx, lm_sess_key->data);
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}
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_OK;
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}
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*user_sess_key = data_blob_null;
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*lm_sess_key = data_blob_null;
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|
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if (!NT_STATUS_EQUAL(auth_status, NT_STATUS_WRONG_PASSWORD)) {
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TALLOC_FREE(tmp_ctx);
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return auth_status;
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}
|
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|
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/*
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* We only continue if this was a wrong password
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* and we'll always return NT_STATUS_WRONG_PASSWORD
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* no matter what error happens.
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*/
|
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|
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/* pull the domain password property attributes */
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ret = dsdb_search_one(sam_ctx, tmp_ctx, &dom_msg, domain_dn, LDB_SCOPE_BASE,
|
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attrs, 0, "objectClass=domain");
|
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if (ret == LDB_SUCCESS) {
|
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history_len = ldb_msg_find_attr_as_uint(dom_msg, "pwdHistoryLength", 0);
|
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} else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
|
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DEBUG(3,("Couldn't find domain %s: %s!\n",
|
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ldb_dn_get_linearized(domain_dn),
|
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ldb_errstring(sam_ctx)));
|
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} else {
|
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DEBUG(3,("error finding domain %s: %s!\n",
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ldb_dn_get_linearized(domain_dn),
|
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ldb_errstring(sam_ctx)));
|
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}
|
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|
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for (i = 1; i < MIN(history_len, 3); i++) {
|
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const struct samr_Password *nt_history_pwd = NULL;
|
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NTTIME pwdLastSet;
|
|
struct timeval tv_now;
|
|
NTTIME now;
|
|
int allowed_period_mins;
|
|
NTTIME allowed_period;
|
|
|
|
/* Reset these variables back to starting as empty */
|
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aes_256_key = NULL;
|
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salt = NULL;
|
|
|
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/*
|
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* Obtain the i'th old password from the NT password
|
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* history for this user.
|
|
*
|
|
* We avoid issues with salts (which are not
|
|
* recorded for historical AES256 keys) by using the
|
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* ntPwdHistory in preference.
|
|
*/
|
|
nt_status = samdb_result_passwords_from_history(tmp_ctx,
|
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auth_context->lp_ctx,
|
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msg, i,
|
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NULL,
|
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&nt_history_pwd);
|
|
|
|
/*
|
|
* Belts and braces: note that
|
|
* samdb_result_passwords_from_history() currently
|
|
* does not fail for missing attributes, it only sets
|
|
* nt_history_pwd = NULL, so "break" and fall down to
|
|
* the bad password count upate if this happens
|
|
*/
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
break;
|
|
}
|
|
|
|
nt_history_pwd = hide_invalid_nthash(nt_history_pwd);
|
|
|
|
/*
|
|
* We don't have an NT hash from the
|
|
* ntPwdHistory, but we can still perform the
|
|
* password check with the AES256
|
|
* key.
|
|
*
|
|
* However, this is the second preference as
|
|
* it will fail if the account was renamed
|
|
* prior to a password change (as we won't
|
|
* have the correct salt available to
|
|
* calculate the AES256 key).
|
|
*/
|
|
|
|
if (nt_history_pwd == NULL && sc_val != NULL &&
|
|
user_info->password_state == AUTH_PASSWORD_PLAIN &&
|
|
current_kvno >= i)
|
|
{
|
|
krb5_error_code krb5_ret;
|
|
const uint32_t request_kvno = current_kvno - i;
|
|
|
|
/*
|
|
* Confirm we have a krb5_context set up
|
|
*/
|
|
if (smb_krb5_context == NULL) {
|
|
/*
|
|
* We get here if we had a unicodePwd
|
|
* for the current password, no
|
|
* ntPwdHistory, a valid previous
|
|
* Kerberos history AND are processing
|
|
* a simple bind.
|
|
*
|
|
* This really is a corner case so
|
|
* favour cleaner code over trying to
|
|
* allow for an old password. It is
|
|
* more likely this is just a new
|
|
* account.
|
|
*
|
|
* "break" out of the loop and fall down
|
|
* to the bad password update
|
|
*/
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Get the current salt from the record
|
|
*/
|
|
|
|
krb5_ret = dsdb_extract_aes_256_key(smb_krb5_context->krb5_context,
|
|
tmp_ctx,
|
|
msg,
|
|
userAccountControl,
|
|
&request_kvno, /* kvno */
|
|
NULL, /* kvno_out */
|
|
&_aes_256_key,
|
|
&salt_data);
|
|
if (krb5_ret != 0) {
|
|
break;
|
|
}
|
|
|
|
aes_256_key = &_aes_256_key;
|
|
|
|
_salt.data = (char *)salt_data.data;
|
|
_salt.length = salt_data.length;
|
|
salt = &_salt;
|
|
|
|
} else if (nt_history_pwd == NULL) {
|
|
/*
|
|
* If we don't find element 'i' in the
|
|
* ntPwdHistory and can not fall back to the
|
|
* kerberos hash, we won't find 'i+1' ...
|
|
*/
|
|
break;
|
|
}
|
|
|
|
auth_status = authsam_password_ok(auth_context, tmp_ctx,
|
|
nt_history_pwd,
|
|
smb_krb5_context,
|
|
aes_256_key,
|
|
salt,
|
|
user_info,
|
|
user_sess_key,
|
|
lm_sess_key);
|
|
|
|
if (!NT_STATUS_IS_OK(auth_status)) {
|
|
/*
|
|
* If this was not a correct password, try the next
|
|
* one from the history
|
|
*/
|
|
*user_sess_key = data_blob_null;
|
|
*lm_sess_key = data_blob_null;
|
|
continue;
|
|
}
|
|
|
|
if (i != 1) {
|
|
/*
|
|
* The authentication was OK, but not against
|
|
* the previous password, which is stored at index 1.
|
|
*
|
|
* We just return the original wrong password.
|
|
* This skips the update of the bad pwd count,
|
|
* because this is almost certainly user error
|
|
* (or automatic login on a computer using a cached
|
|
* password from before the password change),
|
|
* not an attack.
|
|
*/
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
|
|
/*
|
|
* The authentication was OK against the previous password,
|
|
* but it's not a NTLM network authentication,
|
|
* LDAP simple bind or something similar.
|
|
*
|
|
* We just return the original wrong password.
|
|
* This skips the update of the bad pwd count,
|
|
* because this is almost certainly user error
|
|
* (or automatic login on a computer using a cached
|
|
* password from before the password change),
|
|
* not an attack.
|
|
*/
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
/*
|
|
* If the password was OK, it's a NTLM network authentication
|
|
* and it was the previous password.
|
|
*
|
|
* Now we see if it is within the grace period,
|
|
* so that we don't break cached sessions on other computers
|
|
* before the user can lock and unlock their other screens
|
|
* (resetting their cached password).
|
|
*
|
|
* See http://support.microsoft.com/kb/906305
|
|
* OldPasswordAllowedPeriod ("old password allowed period")
|
|
* is specified in minutes. The default is 60.
|
|
*/
|
|
allowed_period_mins = lpcfg_old_password_allowed_period(auth_context->lp_ctx);
|
|
/*
|
|
* NTTIME uses 100ns units
|
|
*/
|
|
allowed_period = (NTTIME) allowed_period_mins *
|
|
60 * 1000*1000*10;
|
|
pwdLastSet = samdb_result_nttime(msg, "pwdLastSet", 0);
|
|
tv_now = timeval_current();
|
|
now = timeval_to_nttime(&tv_now);
|
|
|
|
if (now < pwdLastSet) {
|
|
/*
|
|
* time jump?
|
|
*
|
|
* We just return the original wrong password.
|
|
* This skips the update of the bad pwd count,
|
|
* because this is almost certainly user error
|
|
* (or automatic login on a computer using a cached
|
|
* password from before the password change),
|
|
* not an attack.
|
|
*/
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
if ((now - pwdLastSet) >= allowed_period) {
|
|
/*
|
|
* The allowed period is over.
|
|
*
|
|
* We just return the original wrong password.
|
|
* This skips the update of the bad pwd count,
|
|
* because this is almost certainly user error
|
|
* (or automatic login on a computer using a cached
|
|
* password from before the password change),
|
|
* not an attack.
|
|
*/
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
/*
|
|
* We finally allow the authentication with the
|
|
* previous password within the allowed period.
|
|
*/
|
|
if (user_sess_key->data) {
|
|
talloc_steal(mem_ctx, user_sess_key->data);
|
|
}
|
|
if (lm_sess_key->data) {
|
|
talloc_steal(mem_ctx, lm_sess_key->data);
|
|
}
|
|
|
|
TALLOC_FREE(tmp_ctx);
|
|
return auth_status;
|
|
}
|
|
|
|
/*
|
|
* If we are not in the allowed period or match an old password,
|
|
* we didn't return early. Now update the badPwdCount et al.
|
|
*/
|
|
nt_status = authsam_update_bad_pwd_count(auth_context->sam_ctx,
|
|
msg, domain_dn);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
/*
|
|
* We need to return the original
|
|
* NT_STATUS_WRONG_PASSWORD error, so there isn't
|
|
* anything more we can do than write something into
|
|
* the log
|
|
*/
|
|
DEBUG(0, ("Failed to note bad password for user [%s]: %s\n",
|
|
user_info->mapped.account_name,
|
|
nt_errstr(nt_status)));
|
|
}
|
|
|
|
if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
|
|
*authoritative = false;
|
|
}
|
|
|
|
TALLOC_FREE(tmp_ctx);
|
|
|
|
if (NT_STATUS_IS_OK(nt_status)) {
|
|
nt_status = NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
return nt_status;
|
|
}
|
|
|
|
static NTSTATUS authsam_authenticate(struct auth4_context *auth_context,
|
|
TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
|
|
struct ldb_dn *domain_dn,
|
|
struct ldb_message *msg,
|
|
const struct auth_usersupplied_info *user_info,
|
|
DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key,
|
|
bool *authoritative)
|
|
{
|
|
NTSTATUS nt_status;
|
|
int ret;
|
|
bool interactive = (user_info->password_state == AUTH_PASSWORD_HASH);
|
|
uint32_t acct_flags = samdb_result_acct_flags(msg, NULL);
|
|
struct netr_SendToSamBase *send_to_sam = NULL;
|
|
const struct authn_ntlm_client_policy *authn_client_policy = NULL;
|
|
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
|
|
if (!tmp_ctx) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
/* You can only do an interactive login to normal accounts */
|
|
if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
|
|
if (!(acct_flags & ACB_NORMAL)) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_NO_SUCH_USER;
|
|
}
|
|
if (acct_flags & ACB_SMARTCARD_REQUIRED) {
|
|
if (acct_flags & ACB_DISABLED) {
|
|
DEBUG(2,("authsam_authenticate: Account for user '%s' "
|
|
"was disabled.\n",
|
|
user_info->mapped.account_name));
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_ACCOUNT_DISABLED;
|
|
}
|
|
DEBUG(2,("authsam_authenticate: Account for user '%s' "
|
|
"requires interactive smartcard logon.\n",
|
|
user_info->mapped.account_name));
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_SMARTCARD_LOGON_REQUIRED;
|
|
}
|
|
}
|
|
|
|
/* See whether an authentication policy applies to the client. */
|
|
ret = authn_policy_ntlm_client(sam_ctx,
|
|
tmp_ctx,
|
|
msg,
|
|
&authn_client_policy);
|
|
if (ret) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_INTERNAL_ERROR;
|
|
}
|
|
|
|
nt_status = authn_policy_ntlm_apply_device_restriction(mem_ctx,
|
|
authn_client_policy,
|
|
NULL /* client_audit_info_out */);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
nt_status = authsam_password_check_and_record(auth_context, tmp_ctx,
|
|
domain_dn, msg,
|
|
user_info,
|
|
user_sess_key, lm_sess_key,
|
|
authoritative);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
nt_status = authsam_account_ok(tmp_ctx, auth_context->sam_ctx,
|
|
user_info->logon_parameters,
|
|
domain_dn,
|
|
msg,
|
|
user_info->workstation_name,
|
|
user_info->mapped.account_name,
|
|
false, false);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
nt_status = authsam_logon_success_accounting(auth_context->sam_ctx,
|
|
msg, domain_dn,
|
|
interactive,
|
|
tmp_ctx,
|
|
&send_to_sam);
|
|
|
|
if (send_to_sam != NULL) {
|
|
auth_sam_trigger_zero_password(tmp_ctx,
|
|
auth_context->msg_ctx,
|
|
auth_context->event_ctx,
|
|
send_to_sam);
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
if (user_sess_key && user_sess_key->data) {
|
|
talloc_steal(mem_ctx, user_sess_key->data);
|
|
}
|
|
if (lm_sess_key && lm_sess_key->data) {
|
|
talloc_steal(mem_ctx, lm_sess_key->data);
|
|
}
|
|
|
|
TALLOC_FREE(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
|
|
|
|
static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
const struct auth_usersupplied_info *user_info,
|
|
struct auth_user_info_dc **user_info_dc,
|
|
bool *authoritative)
|
|
{
|
|
NTSTATUS nt_status;
|
|
int result;
|
|
const char *account_name = user_info->mapped.account_name;
|
|
struct ldb_message *msg;
|
|
struct ldb_dn *domain_dn;
|
|
DATA_BLOB user_sess_key, lm_sess_key;
|
|
TALLOC_CTX *tmp_ctx;
|
|
const char *p = NULL;
|
|
|
|
if (ctx->auth_ctx->sam_ctx == NULL) {
|
|
DEBUG(0, ("No SAM available, cannot log in users\n"));
|
|
return NT_STATUS_INVALID_SYSTEM_SERVICE;
|
|
}
|
|
|
|
if (!account_name || !*account_name) {
|
|
/* 'not for me' */
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
tmp_ctx = talloc_new(mem_ctx);
|
|
if (!tmp_ctx) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
|
|
if (domain_dn == NULL) {
|
|
talloc_free(tmp_ctx);
|
|
return NT_STATUS_NO_SUCH_DOMAIN;
|
|
}
|
|
|
|
/*
|
|
* If we have not already mapped this user, then now is a good
|
|
* time to do so, before we look it up. We used to do this
|
|
* earlier, but in a multi-forest environment we want to do
|
|
* this mapping at the final domain.
|
|
*
|
|
* However, on the flip side we may have already mapped the
|
|
* user if this was an LDAP simple bind, in which case we
|
|
* really, really want to get back to exactly the same account
|
|
* we got the DN for.
|
|
*/
|
|
if (!user_info->cracknames_called) {
|
|
p = strchr_m(account_name, '@');
|
|
} else {
|
|
/*
|
|
* This is slightly nicer than double-indenting the
|
|
* block below
|
|
*/
|
|
p = NULL;
|
|
}
|
|
|
|
if (p != NULL) {
|
|
const char *nt4_domain = NULL;
|
|
const char *nt4_account = NULL;
|
|
bool is_my_domain = false;
|
|
|
|
nt_status = crack_name_to_nt4_name(mem_ctx,
|
|
ctx->auth_ctx->sam_ctx,
|
|
/*
|
|
* DRSUAPI_DS_NAME_FORMAT_UPN_FOR_LOGON ?
|
|
*/
|
|
DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL,
|
|
account_name,
|
|
&nt4_domain, &nt4_account);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
talloc_free(tmp_ctx);
|
|
return NT_STATUS_NO_SUCH_USER;
|
|
}
|
|
|
|
is_my_domain = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx, nt4_domain);
|
|
if (!is_my_domain) {
|
|
/*
|
|
* This is a user within our forest,
|
|
* but in a different domain,
|
|
* we're not authoritative
|
|
*/
|
|
talloc_free(tmp_ctx);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
/*
|
|
* Let's use the NT4 account name for the lookup.
|
|
*/
|
|
account_name = nt4_account;
|
|
}
|
|
|
|
nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
talloc_free(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx,
|
|
lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
|
|
lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
|
|
lpcfg_sam_dnsname(ctx->auth_ctx->lp_ctx),
|
|
domain_dn,
|
|
msg,
|
|
data_blob_null, data_blob_null,
|
|
user_info_dc);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
talloc_free(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
result = dsdb_is_protected_user(ctx->auth_ctx->sam_ctx,
|
|
(*user_info_dc)->sids,
|
|
(*user_info_dc)->num_sids);
|
|
/*
|
|
* We also consider an error result (a negative value) as denying the
|
|
* authentication.
|
|
*/
|
|
if (result != 0) {
|
|
talloc_free(tmp_ctx);
|
|
return NT_STATUS_ACCOUNT_RESTRICTION;
|
|
}
|
|
|
|
nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
|
|
&user_sess_key, &lm_sess_key, authoritative);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
talloc_free(tmp_ctx);
|
|
return nt_status;
|
|
}
|
|
|
|
(*user_info_dc)->user_session_key = data_blob_talloc(*user_info_dc,
|
|
user_sess_key.data,
|
|
user_sess_key.length);
|
|
if (user_sess_key.data) {
|
|
if ((*user_info_dc)->user_session_key.data == NULL) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
}
|
|
|
|
(*user_info_dc)->lm_session_key = data_blob_talloc(*user_info_dc,
|
|
lm_sess_key.data,
|
|
lm_sess_key.length);
|
|
if (lm_sess_key.data) {
|
|
if ((*user_info_dc)->lm_session_key.data == NULL) {
|
|
TALLOC_FREE(tmp_ctx);
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
}
|
|
|
|
talloc_steal(mem_ctx, *user_info_dc);
|
|
talloc_free(tmp_ctx);
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
struct authsam_check_password_state {
|
|
struct auth_user_info_dc *user_info_dc;
|
|
bool authoritative;
|
|
};
|
|
|
|
static struct tevent_req *authsam_check_password_send(
|
|
TALLOC_CTX *mem_ctx,
|
|
struct tevent_context *ev,
|
|
struct auth_method_context *ctx,
|
|
const struct auth_usersupplied_info *user_info)
|
|
{
|
|
struct tevent_req *req = NULL;
|
|
struct authsam_check_password_state *state = NULL;
|
|
NTSTATUS status;
|
|
|
|
req = tevent_req_create(
|
|
mem_ctx, &state, struct authsam_check_password_state);
|
|
if (req == NULL) {
|
|
return NULL;
|
|
}
|
|
/*
|
|
* authsam_check_password_internals() sets this to false in
|
|
* the rodc case, otherwise it leaves it untouched. Default to
|
|
* "we're authoritative".
|
|
*/
|
|
state->authoritative = true;
|
|
|
|
status = authsam_check_password_internals(
|
|
ctx,
|
|
state,
|
|
user_info,
|
|
&state->user_info_dc,
|
|
&state->authoritative);
|
|
if (tevent_req_nterror(req, status)) {
|
|
return tevent_req_post(req, ev);
|
|
}
|
|
|
|
tevent_req_done(req);
|
|
return tevent_req_post(req, ev);
|
|
}
|
|
|
|
static NTSTATUS authsam_check_password_recv(
|
|
struct tevent_req *req,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct auth_user_info_dc **interim_info,
|
|
bool *authoritative)
|
|
{
|
|
struct authsam_check_password_state *state = tevent_req_data(
|
|
req, struct authsam_check_password_state);
|
|
NTSTATUS status;
|
|
|
|
*authoritative = state->authoritative;
|
|
|
|
if (tevent_req_is_nterror(req, &status)) {
|
|
tevent_req_received(req);
|
|
return status;
|
|
}
|
|
*interim_info = talloc_move(mem_ctx, &state->user_info_dc);
|
|
tevent_req_received(req);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
const struct auth_usersupplied_info *user_info)
|
|
{
|
|
if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
Check SAM security (above) but with a few extra checks.
|
|
****************************************************************************/
|
|
static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
|
|
TALLOC_CTX *mem_ctx,
|
|
const struct auth_usersupplied_info *user_info)
|
|
{
|
|
const char *effective_domain = user_info->mapped.domain_name;
|
|
bool is_local_name = false;
|
|
bool is_my_domain = false;
|
|
const char *p = NULL;
|
|
struct dsdb_trust_routing_table *trt = NULL;
|
|
const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
|
|
NTSTATUS status;
|
|
|
|
if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
if (effective_domain == NULL) {
|
|
effective_domain = "";
|
|
}
|
|
|
|
is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
|
|
effective_domain);
|
|
|
|
/* check whether or not we service this domain/workgroup name */
|
|
switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
|
|
case ROLE_STANDALONE:
|
|
return NT_STATUS_OK;
|
|
|
|
case ROLE_DOMAIN_MEMBER:
|
|
if (is_local_name) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
DBG_DEBUG("%s is not one of my local names (DOMAIN_MEMBER)\n",
|
|
effective_domain);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
|
|
case ROLE_ACTIVE_DIRECTORY_DC:
|
|
/* handled later */
|
|
break;
|
|
|
|
default:
|
|
DBG_ERR("lpcfg_server_role() has an undefined value\n");
|
|
return NT_STATUS_INVALID_SERVER_STATE;
|
|
}
|
|
|
|
/*
|
|
* Now we handle the AD DC case...
|
|
*/
|
|
|
|
is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
|
|
effective_domain);
|
|
if (is_my_domain) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
if (user_info->cracknames_called) {
|
|
/*
|
|
* The caller already did a cracknames call.
|
|
*/
|
|
DBG_DEBUG("%s is not own domain name (DC)\n",
|
|
effective_domain);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
if (!strequal(effective_domain, "")) {
|
|
DBG_DEBUG("%s is not own domain name (DC)\n",
|
|
effective_domain);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
p = strchr_m(user_info->mapped.account_name, '@');
|
|
if (p == NULL) {
|
|
/*
|
|
* An empty to domain name should be handled
|
|
* as the local domain name.
|
|
*/
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
effective_domain = p + 1;
|
|
is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
|
|
effective_domain);
|
|
if (is_my_domain) {
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
if (strequal(effective_domain, "")) {
|
|
DBG_DEBUG("authsam_check_password: upn without realm (DC)\n");
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
/*
|
|
* as last option we check the routing table if the
|
|
* domain is within our forest.
|
|
*/
|
|
status = dsdb_trust_routing_table_load(ctx->auth_ctx->sam_ctx,
|
|
mem_ctx, &trt);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_ERR("authsam_check_password: dsdb_trust_routing_table_load() %s\n",
|
|
nt_errstr(status));
|
|
return status;
|
|
}
|
|
|
|
tdo = dsdb_trust_routing_by_name(trt, effective_domain);
|
|
if (tdo == NULL) {
|
|
DBG_DEBUG("%s is not a known TLN (DC)\n",
|
|
effective_domain);
|
|
TALLOC_FREE(trt);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
if (!(tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST)) {
|
|
DBG_DEBUG("%s is not a TLN in our forest (DC)\n",
|
|
effective_domain);
|
|
TALLOC_FREE(trt);
|
|
return NT_STATUS_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
/*
|
|
* This principal is within our forest.
|
|
* we'll later do a crack_name_to_nt4_name()
|
|
* to check if it's in our domain.
|
|
*/
|
|
TALLOC_FREE(trt);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static const struct auth_operations sam_ignoredomain_ops = {
|
|
.name = "sam_ignoredomain",
|
|
.want_check = authsam_ignoredomain_want_check,
|
|
.check_password_send = authsam_check_password_send,
|
|
.check_password_recv = authsam_check_password_recv,
|
|
};
|
|
|
|
static const struct auth_operations sam_ops = {
|
|
.name = "sam",
|
|
.want_check = authsam_want_check,
|
|
.check_password_send = authsam_check_password_send,
|
|
.check_password_recv = authsam_check_password_recv,
|
|
};
|
|
|
|
_PUBLIC_ NTSTATUS auth4_sam_init(TALLOC_CTX *);
|
|
_PUBLIC_ NTSTATUS auth4_sam_init(TALLOC_CTX *ctx)
|
|
{
|
|
NTSTATUS ret;
|
|
|
|
ret = auth_register(ctx, &sam_ops);
|
|
if (!NT_STATUS_IS_OK(ret)) {
|
|
DEBUG(0,("Failed to register 'sam' auth backend!\n"));
|
|
return ret;
|
|
}
|
|
|
|
ret = auth_register(ctx, &sam_ignoredomain_ops);
|
|
if (!NT_STATUS_IS_OK(ret)) {
|
|
DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|