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-rw-r--r--source4/kdc/kpasswd-service-heimdal.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/source4/kdc/kpasswd-service-heimdal.c b/source4/kdc/kpasswd-service-heimdal.c
new file mode 100644
index 0000000..c92b13d
--- /dev/null
+++ b/source4/kdc/kpasswd-service-heimdal.c
@@ -0,0 +1,323 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ Samba kpasswd implementation
+
+ Copyright (c) 2016 Andreas Schneider <asn@samba.org>
+
+ 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 "samba/service_task.h"
+#include "param/param.h"
+#include "auth/auth.h"
+#include "auth/gensec/gensec.h"
+#include "gensec_krb5_helpers.h"
+#include "kdc/kdc-server.h"
+#include "kdc/kpasswd_glue.h"
+#include "kdc/kpasswd-service.h"
+#include "kdc/kpasswd-helper.h"
+
+static krb5_error_code kpasswd_change_password(struct kdc_server *kdc,
+ TALLOC_CTX *mem_ctx,
+ const struct gensec_security *gensec_security,
+ struct auth_session_info *session_info,
+ DATA_BLOB *password,
+ DATA_BLOB *kpasswd_reply,
+ const char **error_string)
+{
+ NTSTATUS status;
+ NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
+ enum samPwdChangeReason reject_reason;
+ const char *reject_string = NULL;
+ struct samr_DomInfo1 *dominfo;
+ bool ok;
+ int ret;
+
+ /*
+ * We're doing a password change (rather than a password set), so check
+ * that we were given an initial ticket.
+ */
+ ret = gensec_krb5_initial_ticket(gensec_security);
+ if (ret != 1) {
+ *error_string = "Expected an initial ticket";
+ return KRB5_KPASSWD_INITIAL_FLAG_NEEDED;
+ }
+
+ status = samdb_kpasswd_change_password(mem_ctx,
+ kdc->task->lp_ctx,
+ kdc->task->event_ctx,
+ session_info,
+ password,
+ &reject_reason,
+ &dominfo,
+ &reject_string,
+ &result);
+ if (!NT_STATUS_IS_OK(status)) {
+ ok = kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_ACCESSDENIED,
+ reject_string,
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+ /* We want to send an an authenticated packet. */
+ return 0;
+ }
+
+ ok = kpasswd_make_pwchange_reply(mem_ctx,
+ result,
+ reject_reason,
+ dominfo,
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+
+ return 0;
+}
+
+static krb5_error_code kpasswd_set_password(struct kdc_server *kdc,
+ TALLOC_CTX *mem_ctx,
+ const struct gensec_security *gensec_security,
+ struct auth_session_info *session_info,
+ DATA_BLOB *decoded_data,
+ DATA_BLOB *kpasswd_reply,
+ const char **error_string)
+{
+ krb5_context context = kdc->smb_krb5_context->krb5_context;
+ krb5_error_code code;
+ krb5_principal target_principal;
+ ChangePasswdDataMS chpw = {};
+ size_t chpw_len = 0;
+ DATA_BLOB password = data_blob_null;
+ enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
+ struct samr_DomInfo1 *dominfo = NULL;
+ char *target_principal_string = NULL;
+ bool is_service_principal = false;
+ NTSTATUS status;
+ bool ok;
+
+ code = decode_ChangePasswdDataMS(decoded_data->data,
+ decoded_data->length,
+ &chpw,
+ &chpw_len);
+ if (code != 0) {
+ DBG_WARNING("decode_ChangePasswdDataMS failed\n");
+ ok = kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_MALFORMED,
+ "Failed to decode packet",
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+ return 0;
+ }
+
+ ok = convert_string_talloc_handle(mem_ctx,
+ lpcfg_iconv_handle(kdc->task->lp_ctx),
+ CH_UTF8,
+ CH_UTF16,
+ (const char *)chpw.newpasswd.data,
+ chpw.newpasswd.length,
+ (void **)&password.data,
+ &password.length);
+ if (!ok) {
+ free_ChangePasswdDataMS(&chpw);
+ DBG_WARNING("String conversion failed\n");
+ *error_string = "String conversion failed";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+
+ if ((chpw.targname != NULL && chpw.targrealm == NULL) ||
+ (chpw.targname == NULL && chpw.targrealm != NULL)) {
+ free_ChangePasswdDataMS(&chpw);
+ ok = kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_MALFORMED,
+ "Realm and principal must be "
+ "both present, or neither present",
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+ return 0;
+ }
+
+ if (chpw.targname == NULL || chpw.targrealm == NULL) {
+ free_ChangePasswdDataMS(&chpw);
+ return kpasswd_change_password(kdc,
+ mem_ctx,
+ gensec_security,
+ session_info,
+ &password,
+ kpasswd_reply,
+ error_string);
+ }
+ code = krb5_build_principal_ext(context,
+ &target_principal,
+ strlen(*chpw.targrealm),
+ *chpw.targrealm,
+ 0);
+ if (code != 0) {
+ free_ChangePasswdDataMS(&chpw);
+ return kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_MALFORMED,
+ "Failed to parse principal",
+ kpasswd_reply);
+ }
+ code = copy_PrincipalName(chpw.targname,
+ &target_principal->name);
+ free_ChangePasswdDataMS(&chpw);
+ if (code != 0) {
+ krb5_free_principal(context, target_principal);
+ return kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_MALFORMED,
+ "Failed to parse principal",
+ kpasswd_reply);
+ }
+
+ if (target_principal->name.name_string.len >= 2) {
+ is_service_principal = true;
+
+ code = krb5_unparse_name_short(context,
+ target_principal,
+ &target_principal_string);
+ } else {
+ code = krb5_unparse_name(context,
+ target_principal,
+ &target_principal_string);
+ }
+ krb5_free_principal(context, target_principal);
+ if (code != 0) {
+ ok = kpasswd_make_error_reply(mem_ctx,
+ KRB5_KPASSWD_MALFORMED,
+ "Failed to parse principal",
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+ }
+
+ status = kpasswd_samdb_set_password(mem_ctx,
+ kdc->task->event_ctx,
+ kdc->task->lp_ctx,
+ session_info,
+ is_service_principal,
+ target_principal_string,
+ &password,
+ &reject_reason,
+ &dominfo);
+ if (!NT_STATUS_IS_OK(status)) {
+ DBG_ERR("kpasswd_samdb_set_password failed - %s\n",
+ nt_errstr(status));
+ }
+
+ ok = kpasswd_make_pwchange_reply(mem_ctx,
+ status,
+ reject_reason,
+ dominfo,
+ kpasswd_reply);
+ if (!ok) {
+ *error_string = "Failed to create reply";
+ return KRB5_KPASSWD_HARDERROR;
+ }
+
+ return 0;
+}
+
+krb5_error_code kpasswd_handle_request(struct kdc_server *kdc,
+ TALLOC_CTX *mem_ctx,
+ struct gensec_security *gensec_security,
+ uint16_t verno,
+ DATA_BLOB *decoded_data,
+ DATA_BLOB *kpasswd_reply,
+ const char **error_string)
+{
+ struct auth_session_info *session_info;
+ NTSTATUS status;
+ krb5_error_code code;
+
+ status = gensec_session_info(gensec_security,
+ mem_ctx,
+ &session_info);
+ if (!NT_STATUS_IS_OK(status)) {
+ *error_string = talloc_asprintf(mem_ctx,
+ "gensec_session_info failed - %s",
+ nt_errstr(status));
+ return KRB5_KPASSWD_HARDERROR;
+ }
+
+ /*
+ * Since the kpasswd service shares its keys with the krbtgt, we might
+ * have received a TGT rather than a kpasswd ticket. We need to check
+ * the ticket type to ensure that TGTs cannot be misused in this manner.
+ */
+ code = kpasswd_check_non_tgt(session_info,
+ error_string);
+ if (code != 0) {
+ DBG_WARNING("%s\n", *error_string);
+ return code;
+ }
+
+ switch(verno) {
+ case KRB5_KPASSWD_VERS_CHANGEPW: {
+ DATA_BLOB password = data_blob_null;
+ bool ok;
+
+ ok = convert_string_talloc_handle(mem_ctx,
+ lpcfg_iconv_handle(kdc->task->lp_ctx),
+ CH_UTF8,
+ CH_UTF16,
+ (const char *)decoded_data->data,
+ decoded_data->length,
+ (void **)&password.data,
+ &password.length);
+ if (!ok) {
+ *error_string = "String conversion failed!";
+ DBG_WARNING("%s\n", *error_string);
+ return KRB5_KPASSWD_HARDERROR;
+ }
+
+ return kpasswd_change_password(kdc,
+ mem_ctx,
+ gensec_security,
+ session_info,
+ &password,
+ kpasswd_reply,
+ error_string);
+ }
+ case KRB5_KPASSWD_VERS_SETPW: {
+ return kpasswd_set_password(kdc,
+ mem_ctx,
+ gensec_security,
+ session_info,
+ decoded_data,
+ kpasswd_reply,
+ error_string);
+ }
+ default:
+ *error_string = talloc_asprintf(mem_ctx,
+ "Protocol version %u not supported",
+ verno);
+ return KRB5_KPASSWD_BAD_VERSION;
+ }
+
+ return 0;
+}
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