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-rw-r--r--source4/rpc_server/samr/samr_password.c841
1 files changed, 841 insertions, 0 deletions
diff --git a/source4/rpc_server/samr/samr_password.c b/source4/rpc_server/samr/samr_password.c
new file mode 100644
index 0000000..2b5cd4a
--- /dev/null
+++ b/source4/rpc_server/samr/samr_password.c
@@ -0,0 +1,841 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ samr server password set/change handling
+
+ Copyright (C) Andrew Tridgell 2004
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "rpc_server/dcerpc_server.h"
+#include "rpc_server/common/common.h"
+#include "rpc_server/samr/dcesrv_samr.h"
+#include "system/time.h"
+#include "lib/crypto/md4.h"
+#include "dsdb/common/util.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/auth.h"
+#include "libcli/auth/libcli_auth.h"
+#include "../lib/util/util_ldb.h"
+#include "rpc_server/samr/proto.h"
+#include "auth/auth_sam.h"
+#include "lib/param/loadparm.h"
+#include "librpc/rpc/dcerpc_helper.h"
+#include "librpc/rpc/dcerpc_samr.h"
+
+#include "lib/crypto/gnutls_helpers.h"
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+static void log_password_change_event(struct imessaging_context *msg_ctx,
+ struct loadparm_context *lp_ctx,
+ const struct tsocket_address *remote_client_address,
+ const struct tsocket_address *local_server_address,
+ const char *auth_description,
+ const char *password_type,
+ const char *original_client_name,
+ const char *account_name_from_db,
+ NTSTATUS status,
+ struct dom_sid *sid)
+{
+ /*
+ * Forcing this via the NTLM auth structure is not ideal, but
+ * it is the most practical option right now, and ensures the
+ * logs are consistent, even if some elements are always NULL.
+ */
+ struct auth_usersupplied_info ui = {
+ .was_mapped = true,
+ .client = {
+ .account_name = original_client_name,
+ .domain_name = lpcfg_sam_name(lp_ctx),
+ },
+ .mapped = {
+ .account_name = account_name_from_db,
+ .domain_name = lpcfg_sam_name(lp_ctx),
+ },
+ .remote_host = remote_client_address,
+ .local_host = local_server_address,
+ .service_description = "SAMR Password Change",
+ .auth_description = auth_description,
+ .password_type = password_type,
+ };
+
+ log_authentication_event(msg_ctx,
+ lp_ctx,
+ NULL,
+ &ui,
+ status,
+ ui.mapped.domain_name,
+ ui.mapped.account_name,
+ sid,
+ NULL /* client_audit_info */,
+ NULL /* server_audit_info */);
+}
+/*
+ samr_ChangePasswordUser
+
+ So old it is just not worth implementing
+ because it does not supply a plaintext and so we can't do password
+ complexity checking and cannot update all the other password hashes.
+
+*/
+NTSTATUS dcesrv_samr_ChangePasswordUser(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_ChangePasswordUser *r)
+{
+ return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+/*
+ samr_OemChangePasswordUser2
+
+ No longer implemented as it requires the LM hash
+*/
+NTSTATUS dcesrv_samr_OemChangePasswordUser2(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_OemChangePasswordUser2 *r)
+{
+ return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+/*
+ samr_ChangePasswordUser4
+*/
+NTSTATUS dcesrv_samr_ChangePasswordUser4(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_ChangePasswordUser4 *r)
+{
+ struct ldb_context *sam_ctx = NULL;
+ struct ldb_message *msg = NULL;
+ struct ldb_dn *dn = NULL;
+ const char *samAccountName = NULL;
+ struct dom_sid *objectSid = NULL;
+ struct samr_Password *nt_pwd = NULL;
+ gnutls_datum_t nt_key;
+ gnutls_datum_t salt = {
+ .data = r->in.password->salt,
+ .size = sizeof(r->in.password->salt),
+ };
+ uint8_t cdk_data[16] = {0};
+ DATA_BLOB cdk = {
+ .data = cdk_data,
+ .length = sizeof(cdk_data),
+ };
+ struct auth_session_info *call_session_info = NULL;
+ struct auth_session_info *old_session_info = NULL;
+ NTSTATUS status = NT_STATUS_WRONG_PASSWORD;
+ int rc;
+
+ r->out.result = NT_STATUS_WRONG_PASSWORD;
+
+ if (r->in.password == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (r->in.password->PBKDF2Iterations < 5000 ||
+ r->in.password->PBKDF2Iterations > 1000000) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ /*
+ * Connect to a SAMDB with system privileges for fetching the old
+ * password hashes.
+ */
+ sam_ctx = samdb_connect(mem_ctx,
+ dce_call->event_ctx,
+ dce_call->conn->dce_ctx->lp_ctx,
+ system_session(dce_call->conn->dce_ctx->lp_ctx),
+ dce_call->conn->remote_address,
+ 0);
+ if (sam_ctx == NULL) {
+ return NT_STATUS_INVALID_SYSTEM_SERVICE;
+ }
+
+ rc = ldb_transaction_start(sam_ctx);
+ if (rc != LDB_SUCCESS) {
+ DBG_WARNING("Failed to start transaction: %s\n",
+ ldb_errstring(sam_ctx));
+ return NT_STATUS_TRANSACTION_ABORTED;
+ }
+
+ /*
+ * We use authsam_search_account() to be consistent with the
+ * other callers in the bad password and audit log handling
+ * systems. It ensures we get DSDB_SEARCH_SHOW_EXTENDED_DN.
+ */
+ status = authsam_search_account(mem_ctx,
+ sam_ctx,
+ r->in.account->string,
+ ldb_get_default_basedn(sam_ctx),
+ &msg);
+ if (!NT_STATUS_IS_OK(status)) {
+ ldb_transaction_cancel(sam_ctx);
+ goto done;
+ }
+
+ dn = msg->dn;
+ samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
+ objectSid = samdb_result_dom_sid(msg, msg, "objectSid");
+
+ status = samdb_result_passwords(mem_ctx,
+ dce_call->conn->dce_ctx->lp_ctx,
+ msg,
+ &nt_pwd);
+ if (!NT_STATUS_IS_OK(status)) {
+ ldb_transaction_cancel(sam_ctx);
+ goto done;
+ }
+
+ if (nt_pwd == NULL) {
+ ldb_transaction_cancel(sam_ctx);
+ status = NT_STATUS_WRONG_PASSWORD;
+ goto done;
+ }
+
+ nt_key = (gnutls_datum_t){
+ .data = nt_pwd->hash,
+ .size = sizeof(nt_pwd->hash),
+ };
+
+ rc = gnutls_pbkdf2(GNUTLS_MAC_SHA512,
+ &nt_key,
+ &salt,
+ r->in.password->PBKDF2Iterations,
+ cdk.data,
+ cdk.length);
+ if (rc < 0) {
+ ldb_transaction_cancel(sam_ctx);
+ status = NT_STATUS_WRONG_PASSWORD;
+ goto done;
+ }
+
+ /* Drop to user privileges for the password change */
+
+ old_session_info = ldb_get_opaque(sam_ctx, DSDB_SESSION_INFO);
+ call_session_info = dcesrv_call_session_info(dce_call);
+
+ rc = ldb_set_opaque(sam_ctx, DSDB_SESSION_INFO, call_session_info);
+ if (rc != LDB_SUCCESS) {
+ ldb_transaction_cancel(sam_ctx);
+ status = NT_STATUS_INVALID_SYSTEM_SERVICE;
+ goto done;
+ }
+
+ status = samr_set_password_aes(dce_call,
+ mem_ctx,
+ &cdk,
+ sam_ctx,
+ dn,
+ NULL,
+ r->in.password,
+ DSDB_PASSWORD_CHECKED_AND_CORRECT);
+ BURN_DATA(cdk_data);
+
+ /* Restore our privileges to system level */
+ if (old_session_info != NULL) {
+ ldb_set_opaque(sam_ctx, DSDB_SESSION_INFO, old_session_info);
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ ldb_transaction_cancel(sam_ctx);
+ goto done;
+ }
+
+ /* And this confirms it in a transaction commit */
+ rc = ldb_transaction_commit(sam_ctx);
+ if (rc != LDB_SUCCESS) {
+ DBG_WARNING("Failed to commit transaction to change password "
+ "on %s: %s\n",
+ ldb_dn_get_linearized(dn),
+ ldb_errstring(sam_ctx));
+ status = NT_STATUS_TRANSACTION_ABORTED;
+ goto done;
+ }
+
+ status = NT_STATUS_OK;
+done:
+ {
+ struct imessaging_context *imsg_ctx =
+ dcesrv_imessaging_context(dce_call->conn);
+
+ log_password_change_event(imsg_ctx,
+ dce_call->conn->dce_ctx->lp_ctx,
+ dce_call->conn->remote_address,
+ dce_call->conn->local_address,
+ "samr_ChangePasswordUser4",
+ "AES using NTLM-hash",
+ r->in.account->string,
+ samAccountName,
+ status,
+ objectSid);
+ }
+
+ /* Only update the badPwdCount if we found the user */
+ if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
+ authsam_update_bad_pwd_count(sam_ctx,
+ msg,
+ ldb_get_default_basedn(sam_ctx));
+ } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
+ /*
+ * Don't give the game away: (don't allow anonymous users to
+ * prove the existence of usernames)
+ */
+ status = NT_STATUS_WRONG_PASSWORD;
+ }
+
+ return status;
+}
+
+static NTSTATUS dcesrv_samr_ChangePasswordUser_impl(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_ChangePasswordUser3 *r,
+ const char *function_name)
+{
+ struct imessaging_context *imsg_ctx =
+ dcesrv_imessaging_context(dce_call->conn);
+ NTSTATUS status = NT_STATUS_WRONG_PASSWORD;
+ DATA_BLOB new_password;
+ struct ldb_context *sam_ctx = NULL;
+ struct ldb_dn *user_dn = NULL;
+ int ret;
+ struct ldb_message *msg = NULL;
+ struct samr_Password *nt_pwd;
+ struct samr_DomInfo1 *dominfo = NULL;
+ struct userPwdChangeFailureInformation *reject = NULL;
+ enum samPwdChangeReason reason = SAM_PWD_CHANGE_NO_ERROR;
+ uint8_t new_nt_hash[16];
+ struct samr_Password nt_verifier;
+ const char *user_samAccountName = NULL;
+ struct dom_sid *user_objectSid = NULL;
+ struct loadparm_context *lp_ctx = dce_call->conn->dce_ctx->lp_ctx;
+ enum ntlm_auth_level ntlm_auth_level
+ = lpcfg_ntlm_auth(lp_ctx);
+ gnutls_cipher_hd_t cipher_hnd = NULL;
+ gnutls_datum_t nt_session_key;
+ struct auth_session_info *call_session_info = NULL;
+ struct auth_session_info *old_session_info = NULL;
+ int rc;
+
+ *r->out.dominfo = NULL;
+ *r->out.reject = NULL;
+
+ /* this call should be disabled without NTLM auth */
+ if (ntlm_auth_level == NTLM_AUTH_DISABLED) {
+ DBG_WARNING("NTLM password changes not"
+ "permitted by configuration.\n");
+ return NT_STATUS_NTLM_BLOCKED;
+ }
+
+ if (r->in.nt_password == NULL ||
+ r->in.nt_verifier == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* Connect to a SAMDB with system privileges for fetching the old pw
+ * hashes. */
+ sam_ctx = dcesrv_samdb_connect_as_system(mem_ctx, dce_call);
+ if (sam_ctx == NULL) {
+ return NT_STATUS_INVALID_SYSTEM_SERVICE;
+ }
+
+ ret = ldb_transaction_start(sam_ctx);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(1, ("Failed to start transaction: %s\n", ldb_errstring(sam_ctx)));
+ return NT_STATUS_TRANSACTION_ABORTED;
+ }
+
+ /*
+ * We use authsam_search_account() to be consistent with the
+ * other callers in the bad password and audit log handling
+ * systems. It ensures we get DSDB_SEARCH_SHOW_EXTENDED_DN.
+ */
+ status = authsam_search_account(mem_ctx,
+ sam_ctx,
+ r->in.account->string,
+ ldb_get_default_basedn(sam_ctx),
+ &msg);
+ if (!NT_STATUS_IS_OK(status)) {
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ user_dn = msg->dn;
+ user_samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
+ user_objectSid = samdb_result_dom_sid(mem_ctx, msg, "objectSid");
+
+ status = samdb_result_passwords(mem_ctx, lp_ctx,
+ msg, &nt_pwd);
+ if (!NT_STATUS_IS_OK(status) ) {
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ if (!nt_pwd) {
+ status = NT_STATUS_WRONG_PASSWORD;
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ /* decrypt the password we have been given */
+ nt_session_key = (gnutls_datum_t) {
+ .data = nt_pwd->hash,
+ .size = sizeof(nt_pwd->hash),
+ };
+
+ rc = gnutls_cipher_init(&cipher_hnd,
+ GNUTLS_CIPHER_ARCFOUR_128,
+ &nt_session_key,
+ NULL);
+ if (rc < 0) {
+ status = gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ rc = gnutls_cipher_decrypt(cipher_hnd,
+ r->in.nt_password->data,
+ 516);
+ gnutls_cipher_deinit(cipher_hnd);
+ if (rc < 0) {
+ status = gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ if (!extract_pw_from_buffer(mem_ctx, r->in.nt_password->data, &new_password)) {
+ DEBUG(3,("samr: failed to decode password buffer\n"));
+ status = NT_STATUS_WRONG_PASSWORD;
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ if (r->in.nt_verifier == NULL) {
+ status = NT_STATUS_WRONG_PASSWORD;
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ /* check NT verifier */
+ mdfour(new_nt_hash, new_password.data, new_password.length);
+
+ rc = E_old_pw_hash(new_nt_hash, nt_pwd->hash, nt_verifier.hash);
+ if (rc != 0) {
+ status = gnutls_error_to_ntstatus(rc, NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+ if (!mem_equal_const_time(nt_verifier.hash, r->in.nt_verifier->hash, 16)) {
+ status = NT_STATUS_WRONG_PASSWORD;
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ /* Drop to user privileges for the password change */
+
+ old_session_info = ldb_get_opaque(sam_ctx, DSDB_SESSION_INFO);
+ call_session_info = dcesrv_call_session_info(dce_call);
+
+ ret = ldb_set_opaque(sam_ctx, DSDB_SESSION_INFO, call_session_info);
+ if (ret != LDB_SUCCESS) {
+ status = NT_STATUS_INVALID_SYSTEM_SERVICE;
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ /* Performs the password modification. We pass the old hashes read out
+ * from the database since they were already checked against the user-
+ * provided ones. */
+ status = samdb_set_password(sam_ctx, mem_ctx,
+ user_dn, NULL,
+ &new_password,
+ NULL,
+ DSDB_PASSWORD_CHECKED_AND_CORRECT,
+ &reason,
+ &dominfo);
+
+ /* Restore our privileges to system level */
+ if (old_session_info != NULL) {
+ ldb_set_opaque(sam_ctx, DSDB_SESSION_INFO, old_session_info);
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ ldb_transaction_cancel(sam_ctx);
+ goto failed;
+ }
+
+ /* And this confirms it in a transaction commit */
+ ret = ldb_transaction_commit(sam_ctx);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(1,("Failed to commit transaction to change password on %s: %s\n",
+ ldb_dn_get_linearized(user_dn),
+ ldb_errstring(sam_ctx)));
+ status = NT_STATUS_TRANSACTION_ABORTED;
+ goto failed;
+ }
+
+ status = NT_STATUS_OK;
+
+failed:
+
+ log_password_change_event(imsg_ctx,
+ lp_ctx,
+ dce_call->conn->remote_address,
+ dce_call->conn->local_address,
+ function_name,
+ "RC4/DES using NTLM-hash",
+ r->in.account->string,
+ user_samAccountName,
+ status,
+ user_objectSid);
+ if (NT_STATUS_IS_OK(status)) {
+ return NT_STATUS_OK;
+ }
+
+ /* Only update the badPwdCount if we found the user */
+ if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
+ NTSTATUS bad_pwd_status;
+
+ bad_pwd_status = authsam_update_bad_pwd_count(
+ sam_ctx, msg, ldb_get_default_basedn(sam_ctx));
+ if (NT_STATUS_EQUAL(bad_pwd_status, NT_STATUS_ACCOUNT_LOCKED_OUT)) {
+ status = bad_pwd_status;
+ }
+ } else if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
+ /* Don't give the game away: (don't allow anonymous users to prove the existence of usernames) */
+ status = NT_STATUS_WRONG_PASSWORD;
+ }
+
+ reject = talloc_zero(mem_ctx, struct userPwdChangeFailureInformation);
+ if (reject != NULL) {
+ reject->extendedFailureReason = reason;
+
+ *r->out.reject = reject;
+ }
+
+ *r->out.dominfo = dominfo;
+
+ return status;
+}
+
+/*
+ samr_ChangePasswordUser3
+*/
+NTSTATUS dcesrv_samr_ChangePasswordUser3(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_ChangePasswordUser3 *r)
+{
+ return dcesrv_samr_ChangePasswordUser_impl(dce_call, mem_ctx, r,
+ "samr_ChangePasswordUser3");
+}
+
+/*
+ samr_ChangePasswordUser2
+
+ easy - just a subset of samr_ChangePasswordUser3
+*/
+NTSTATUS dcesrv_samr_ChangePasswordUser2(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ struct samr_ChangePasswordUser2 *r)
+{
+ struct samr_ChangePasswordUser3 r2;
+ struct samr_DomInfo1 *dominfo = NULL;
+ struct userPwdChangeFailureInformation *reject = NULL;
+
+ r2.in.server = r->in.server;
+ r2.in.account = r->in.account;
+ r2.in.nt_password = r->in.nt_password;
+ r2.in.nt_verifier = r->in.nt_verifier;
+ r2.in.lm_change = r->in.lm_change;
+ r2.in.lm_password = r->in.lm_password;
+ r2.in.lm_verifier = r->in.lm_verifier;
+ r2.in.password3 = NULL;
+ r2.out.dominfo = &dominfo;
+ r2.out.reject = &reject;
+
+ return dcesrv_samr_ChangePasswordUser_impl(dce_call, mem_ctx, &r2,
+ "samr_ChangePasswordUser2");
+}
+
+
+/*
+ set password via a samr_CryptPassword buffer
+*/
+NTSTATUS samr_set_password(struct dcesrv_call_state *dce_call,
+ struct ldb_context *sam_ctx,
+ struct ldb_dn *account_dn, struct ldb_dn *domain_dn,
+ TALLOC_CTX *mem_ctx,
+ struct samr_CryptPassword *pwbuf)
+{
+ NTSTATUS nt_status;
+ DATA_BLOB new_password;
+ DATA_BLOB session_key = data_blob(NULL, 0);
+ gnutls_cipher_hd_t cipher_hnd = NULL;
+ gnutls_datum_t _session_key;
+ struct auth_session_info *session_info =
+ dcesrv_call_session_info(dce_call);
+ struct loadparm_context *lp_ctx = dce_call->conn->dce_ctx->lp_ctx;
+ int rc;
+ bool encrypted;
+
+ encrypted = dcerpc_is_transport_encrypted(session_info);
+ if (lpcfg_weak_crypto(lp_ctx) == SAMBA_WEAK_CRYPTO_DISALLOWED &&
+ !encrypted) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ nt_status = dcesrv_transport_session_key(dce_call, &session_key);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DBG_NOTICE("samr: failed to get session key: %s\n",
+ nt_errstr(nt_status));
+ return nt_status;
+ }
+
+ _session_key = (gnutls_datum_t) {
+ .data = session_key.data,
+ .size = session_key.length,
+ };
+
+ /*
+ * This is safe to support as we only have a session key
+ * over a SMB connection which we force to be encrypted.
+ */
+ GNUTLS_FIPS140_SET_LAX_MODE();
+ rc = gnutls_cipher_init(&cipher_hnd,
+ GNUTLS_CIPHER_ARCFOUR_128,
+ &_session_key,
+ NULL);
+ if (rc < 0) {
+ GNUTLS_FIPS140_SET_STRICT_MODE();
+ nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
+ goto out;
+ }
+
+ rc = gnutls_cipher_decrypt(cipher_hnd,
+ pwbuf->data,
+ 516);
+ gnutls_cipher_deinit(cipher_hnd);
+ GNUTLS_FIPS140_SET_STRICT_MODE();
+ if (rc < 0) {
+ nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
+ goto out;
+ }
+
+ if (!extract_pw_from_buffer(mem_ctx, pwbuf->data, &new_password)) {
+ DEBUG(3,("samr: failed to decode password buffer\n"));
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ /* set the password - samdb needs to know both the domain and user DNs,
+ so the domain password policy can be used */
+ nt_status = samdb_set_password(sam_ctx,
+ mem_ctx,
+ account_dn,
+ domain_dn,
+ &new_password,
+ NULL,
+ DSDB_PASSWORD_RESET,
+ NULL,
+ NULL);
+out:
+ return nt_status;
+}
+
+
+/*
+ set password via a samr_CryptPasswordEx buffer
+*/
+NTSTATUS samr_set_password_ex(struct dcesrv_call_state *dce_call,
+ struct ldb_context *sam_ctx,
+ struct ldb_dn *account_dn,
+ struct ldb_dn *domain_dn,
+ TALLOC_CTX *mem_ctx,
+ struct samr_CryptPasswordEx *pwbuf)
+{
+ struct loadparm_context *lp_ctx = dce_call->conn->dce_ctx->lp_ctx;
+ struct auth_session_info *session_info =
+ dcesrv_call_session_info(dce_call);
+ NTSTATUS nt_status;
+ DATA_BLOB new_password;
+
+ /* The confounder is in the last 16 bytes of the buffer */
+ DATA_BLOB confounder = data_blob_const(&pwbuf->data[516], 16);
+ DATA_BLOB pw_data = data_blob_const(pwbuf->data, 516);
+ DATA_BLOB session_key = data_blob(NULL, 0);
+ int rc;
+ bool encrypted;
+
+ nt_status = dcesrv_transport_session_key(dce_call, &session_key);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(3,("samr: failed to get session key: %s "
+ "=> NT_STATUS_WRONG_PASSWORD\n",
+ nt_errstr(nt_status)));
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ encrypted = dcerpc_is_transport_encrypted(session_info);
+ if (lpcfg_weak_crypto(lp_ctx) == SAMBA_WEAK_CRYPTO_DISALLOWED &&
+ !encrypted) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ GNUTLS_FIPS140_SET_LAX_MODE();
+ rc = samba_gnutls_arcfour_confounded_md5(&confounder,
+ &session_key,
+ &pw_data,
+ SAMBA_GNUTLS_DECRYPT);
+ GNUTLS_FIPS140_SET_STRICT_MODE();
+ if (rc < 0) {
+ nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_HASH_NOT_SUPPORTED);
+ goto out;
+ }
+
+ if (!extract_pw_from_buffer(mem_ctx, pwbuf->data, &new_password)) {
+ DEBUG(3,("samr: failed to decode password buffer\n"));
+ nt_status = NT_STATUS_WRONG_PASSWORD;
+ goto out;
+ }
+
+ /* set the password - samdb needs to know both the domain and user DNs,
+ so the domain password policy can be used */
+ nt_status = samdb_set_password(sam_ctx,
+ mem_ctx,
+ account_dn,
+ domain_dn,
+ &new_password,
+ NULL,
+ DSDB_PASSWORD_RESET,
+ NULL,
+ NULL);
+ ZERO_ARRAY_LEN(new_password.data,
+ new_password.length);
+
+out:
+ return nt_status;
+}
+
+/*
+ set password via encrypted NT and LM hash buffers
+*/
+NTSTATUS samr_set_password_buffers(struct dcesrv_call_state *dce_call,
+ struct ldb_context *sam_ctx,
+ struct ldb_dn *account_dn,
+ struct ldb_dn *domain_dn,
+ TALLOC_CTX *mem_ctx,
+ const uint8_t *lm_pwd_hash,
+ const uint8_t *nt_pwd_hash)
+{
+ struct samr_Password *d_lm_pwd_hash = NULL, *d_nt_pwd_hash = NULL;
+ uint8_t random_session_key[16] = { 0, };
+ DATA_BLOB session_key = data_blob(NULL, 0);
+ DATA_BLOB in, out;
+ NTSTATUS nt_status = NT_STATUS_OK;
+ int rc;
+
+ nt_status = dcesrv_transport_session_key(dce_call, &session_key);
+ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {
+ DEBUG(3,("samr: failed to get session key: %s "
+ "=> use a random session key\n",
+ nt_errstr(nt_status)));
+
+ /*
+ * Windows just uses a random key
+ */
+ generate_random_buffer(random_session_key,
+ sizeof(random_session_key));
+ session_key = data_blob_const(random_session_key,
+ sizeof(random_session_key));
+ nt_status = NT_STATUS_OK;
+ }
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
+ }
+
+ if (nt_pwd_hash != NULL) {
+ in = data_blob_const(nt_pwd_hash, 16);
+ out = data_blob_talloc_zero(mem_ctx, 16);
+
+ rc = sess_crypt_blob(&out, &in, &session_key, SAMBA_GNUTLS_DECRYPT);
+ if (rc != 0) {
+ return gnutls_error_to_ntstatus(rc,
+ NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER);
+ }
+
+ d_nt_pwd_hash = (struct samr_Password *) out.data;
+ }
+
+ if ((d_lm_pwd_hash != NULL) || (d_nt_pwd_hash != NULL)) {
+ nt_status = samdb_set_password(sam_ctx, mem_ctx, account_dn,
+ domain_dn, NULL,
+ d_nt_pwd_hash,
+ DSDB_PASSWORD_RESET,
+ NULL, NULL);
+ }
+
+ return nt_status;
+}
+
+NTSTATUS samr_set_password_aes(struct dcesrv_call_state *dce_call,
+ TALLOC_CTX *mem_ctx,
+ const DATA_BLOB *cdk,
+ struct ldb_context *sam_ctx,
+ struct ldb_dn *account_dn,
+ struct ldb_dn *domain_dn,
+ struct samr_EncryptedPasswordAES *pwbuf,
+ enum dsdb_password_checked old_password_checked)
+{
+ DATA_BLOB pw_data = data_blob_null;
+ DATA_BLOB new_password = data_blob_null;
+ const DATA_BLOB ciphertext =
+ data_blob_const(pwbuf->cipher, pwbuf->cipher_len);
+ DATA_BLOB iv = data_blob_const(pwbuf->salt, sizeof(pwbuf->salt));
+ NTSTATUS nt_status = NT_STATUS_OK;
+ bool ok;
+
+ nt_status = samba_gnutls_aead_aes_256_cbc_hmac_sha512_decrypt(
+ mem_ctx,
+ &ciphertext,
+ cdk,
+ &samr_aes256_enc_key_salt,
+ &samr_aes256_mac_key_salt,
+ &iv,
+ pwbuf->auth_data,
+ &pw_data);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ ok = extract_pwd_blob_from_buffer514(mem_ctx,
+ pw_data.data,
+ &new_password);
+ TALLOC_FREE(pw_data.data);
+ if (!ok) {
+ DBG_NOTICE("samr: failed to decode password buffer\n");
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ nt_status = samdb_set_password(sam_ctx,
+ mem_ctx,
+ account_dn,
+ domain_dn,
+ &new_password,
+ NULL,
+ old_password_checked,
+ NULL,
+ NULL);
+ TALLOC_FREE(new_password.data);
+
+ return nt_status;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-18 12:11:49 +0000