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-rw-r--r--source4/kdc/mit_samba.c374
1 files changed, 374 insertions, 0 deletions
diff --git a/source4/kdc/mit_samba.c b/source4/kdc/mit_samba.c
new file mode 100644
index 0000000000..3faa20938f
--- /dev/null
+++ b/source4/kdc/mit_samba.c
@@ -0,0 +1,374 @@
+/*
+ MIT-Samba4 library
+
+ Copyright (c) 2010, Simo Sorce <idra@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 "param/param.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/auth.h"
+#include "auth/credentials/credentials.h"
+#include "system/kerberos.h"
+#include "hdb.h"
+#include "mit_samba_interface.h"
+#include "auth/kerberos/kerberos.h"
+#include "kdc/samba_kdc.h"
+#include "kdc/pac-glue.h"
+#include "kdc/db-glue.h"
+
+const int mit_samba_interface_version = MIT_SAMBA_INTERFACE_VERSION;
+
+struct mit_samba_context {
+ struct auth_session_info *session_info;
+
+ /* for compat with hdb plugin common code */
+ krb5_context context;
+ struct samba_kdc_db_context *db_ctx;
+};
+
+static void mit_samba_context_free(struct mit_samba_context *ctx)
+{
+ /* free heimdal's krb5_context */
+ if (ctx->context) {
+ krb5_free_context(ctx->context);
+ }
+
+ /* then free everything else */
+ talloc_free(ctx);
+}
+
+static int mit_samba_context_init(struct mit_samba_context **_ctx)
+{
+ struct mit_samba_context *ctx;
+ const char *s4_conf_file;
+ int ret;
+
+
+ ctx = talloc(NULL, struct mit_samba_context);
+ if (!ctx) {
+ ret = ENOMEM;
+ goto done;
+ }
+
+ ctx->db_ctx = talloc_zero(ctx, struct samba_kdc_db_context);
+ if (!ctx->db_ctx) {
+ ret = ENOMEM;
+ goto done;
+ }
+
+ ctx->db_ctx->ev_ctx = tevent_context_init(ctx);
+ if (!ctx->db_ctx->ev_ctx) {
+ ret = ENOMEM;
+ goto done;
+ }
+ ctx->db_ctx->lp_ctx = loadparm_init(ctx);
+ if (!ctx->db_ctx->lp_ctx) {
+ ret = ENOMEM;
+ goto done;
+ }
+
+ /* init s4 configuration */
+ s4_conf_file = lp_configfile(ctx->db_ctx->lp_ctx);
+ if (s4_conf_file) {
+ lp_load(ctx->db_ctx->lp_ctx, s4_conf_file);
+ } else {
+ lp_load_default(ctx->db_ctx->lp_ctx);
+ }
+
+ ctx->session_info = system_session(ctx->db_ctx->lp_ctx);
+ if (!ctx->session_info) {
+ ret = EFAULT;
+ goto done;
+ }
+
+ cli_credentials_set_kerberos_state(ctx->session_info->credentials,
+ CRED_DONT_USE_KERBEROS);
+
+ ctx->db_ctx->ic_ctx = lp_iconv_convenience(ctx->db_ctx->lp_ctx);
+
+ ctx->db_ctx->samdb = samdb_connect(ctx,
+ ctx->db_ctx->ev_ctx,
+ ctx->db_ctx->lp_ctx,
+ ctx->session_info);
+ if (!ctx->db_ctx->samdb) {
+ ret = EFAULT;
+ goto done;
+ }
+
+ /* init heimdal's krb_context and log facilities */
+ ret = smb_krb5_init_context_basic(ctx,
+ ctx->db_ctx->ev_ctx,
+ ctx->db_ctx->lp_ctx,
+ &ctx->context);
+ if (ret) {
+ goto done;
+ }
+
+ ret = 0;
+
+done:
+ if (ret) {
+ mit_samba_context_free(ctx);
+ } else {
+ *_ctx = ctx;
+ }
+ return ret;
+}
+
+
+static int mit_samba_get_principal(struct mit_samba_context *ctx,
+ char *principal_string,
+ unsigned int flags,
+ hdb_entry_ex **_hentry)
+{
+ krb5_principal principal;
+ hdb_entry_ex *hentry;
+ int ret;
+
+ hentry = talloc(ctx, hdb_entry_ex);
+ if (!hentry) {
+ return ENOMEM;
+ }
+
+ ret = krb5_parse_name(ctx->context, principal_string, &principal);
+ if (ret) {
+ goto done;
+ }
+
+ ret = samba_kdc_fetch(ctx->context, ctx->db_ctx,
+ principal, flags, hentry);
+
+ krb5_free_principal(ctx->context, principal);
+
+done:
+ if (ret) {
+ talloc_free(hentry);
+ } else {
+ talloc_steal(hentry->ctx, hentry);
+ *_hentry = hentry;
+ }
+ return ret;
+}
+
+static int mit_samba_get_firstkey(struct mit_samba_context *ctx,
+ hdb_entry_ex **_hentry)
+{
+ hdb_entry_ex *hentry;
+ int ret;
+
+ hentry = talloc(ctx, hdb_entry_ex);
+ if (!hentry) {
+ return ENOMEM;
+ }
+
+ ret = samba_kdc_firstkey(ctx->context, ctx->db_ctx, hentry);
+
+ if (ret) {
+ talloc_free(hentry);
+ } else {
+ talloc_steal(hentry->ctx, hentry);
+ *_hentry = hentry;
+ }
+ return ret;
+}
+
+static int mit_samba_get_nextkey(struct mit_samba_context *ctx,
+ hdb_entry_ex **_hentry)
+{
+ hdb_entry_ex *hentry;
+ int ret;
+
+ hentry = talloc(ctx, hdb_entry_ex);
+ if (!hentry) {
+ return ENOMEM;
+ }
+
+ ret = samba_kdc_nextkey(ctx->context, ctx->db_ctx, hentry);
+
+ if (ret) {
+ talloc_free(hentry);
+ } else {
+ talloc_steal(hentry->ctx, hentry);
+ *_hentry = hentry;
+ }
+ return ret;
+}
+
+static int mit_samba_get_pac_data(struct mit_samba_context *ctx,
+ hdb_entry_ex *client,
+ DATA_BLOB *data)
+{
+ TALLOC_CTX *tmp_ctx;
+ DATA_BLOB *pac_blob;
+ NTSTATUS nt_status;
+
+ tmp_ctx = talloc_named(ctx, 0, "mit_samba_get_pac_data context");
+ if (!tmp_ctx) {
+ return ENOMEM;
+ }
+
+ nt_status = samba_kdc_get_pac_blob(tmp_ctx, client, &pac_blob);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ talloc_free(tmp_ctx);
+ return EINVAL;
+ }
+
+ data->data = (uint8_t *)malloc(pac_blob->length);
+ if (!data->data) {
+ talloc_free(tmp_ctx);
+ return ENOMEM;
+ }
+ memcpy(data->data, pac_blob->data, pac_blob->length);
+ data->length = pac_blob->length;
+
+ talloc_free(tmp_ctx);
+ return 0;
+}
+
+static int mit_samba_update_pac_data(struct mit_samba_context *ctx,
+ hdb_entry_ex *client,
+ DATA_BLOB *pac_data,
+ DATA_BLOB *logon_data)
+{
+ TALLOC_CTX *tmp_ctx;
+ DATA_BLOB *logon_blob;
+ krb5_error_code code;
+ NTSTATUS nt_status;
+ krb5_pac pac = NULL;
+ int ret;
+
+ /* The user account may be set not to want the PAC */
+ if (client && !samba_princ_needs_pac(client)) {
+ return EINVAL;
+ }
+
+ tmp_ctx = talloc_named(ctx, 0, "mit_samba_update_pac_data context");
+ if (!tmp_ctx) {
+ return ENOMEM;
+ }
+
+ logon_blob = talloc_zero(tmp_ctx, DATA_BLOB);
+ if (!logon_blob) {
+ ret = ENOMEM;
+ goto done;
+ }
+
+ code = krb5_pac_parse(ctx->context,
+ pac_data->data, pac_data->length, &pac);
+ if (code) {
+ ret = EINVAL;
+ goto done;
+ }
+
+ nt_status = samba_kdc_update_pac_blob(tmp_ctx, ctx->context,
+ ctx->db_ctx->ic_ctx,
+ &pac, logon_blob);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(0, ("Building PAC failed: %s\n",
+ nt_errstr(nt_status)));
+ ret = EINVAL;
+ goto done;
+ }
+
+ logon_data->data = (uint8_t *)malloc(logon_blob->length);
+ if (!logon_data->data) {
+ ret = ENOMEM;
+ goto done;
+ }
+ memcpy(logon_data->data, logon_blob->data, logon_blob->length);
+ logon_data->length = logon_blob->length;
+
+ ret = 0;
+
+done:
+ if (pac) krb5_pac_free(ctx->context, pac);
+ talloc_free(tmp_ctx);
+ return ret;
+}
+
+static int mit_samba_check_client_access(struct mit_samba_context *ctx,
+ hdb_entry_ex *client,
+ const char *client_name,
+ hdb_entry_ex *server,
+ const char *server_name,
+ const char *netbios_name,
+ bool password_change,
+ DATA_BLOB *e_data)
+{
+ struct samba_kdc_entry *kdc_entry;
+ NTSTATUS nt_status;
+
+ kdc_entry = talloc_get_type(client->ctx, struct samba_kdc_entry);
+
+ nt_status = samba_kdc_check_client_access(kdc_entry,
+ client_name,
+ netbios_name,
+ password_change);
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
+ return ENOMEM;
+ }
+
+ samba_kdc_build_edata_reply(nt_status, e_data);
+
+ return samba_kdc_map_policy_err(nt_status);
+ }
+
+ return 0;
+}
+
+static int mit_samba_check_s4u2proxy(struct mit_samba_context *ctx,
+ hdb_entry_ex *entry,
+ const char *target_name,
+ bool is_nt_enterprise_name)
+{
+ krb5_principal target_principal;
+ int flags = 0;
+ int ret;
+
+ if (is_nt_enterprise_name) {
+ flags = KRB5_PRINCIPAL_PARSE_ENTERPRISE;
+ }
+
+ ret = krb5_parse_name_flags(ctx->context, target_name,
+ flags, &target_principal);
+ if (ret) {
+ return ret;
+ }
+
+ ret = samba_kdc_check_constrained_delegation(ctx->context,
+ ctx->db_ctx,
+ entry,
+ target_principal);
+
+ krb5_free_principal(ctx->context, target_principal);
+
+ return ret;
+}
+
+struct mit_samba_function_table mit_samba_function_table = {
+ mit_samba_context_init,
+ mit_samba_context_free,
+ mit_samba_get_principal,
+ mit_samba_get_firstkey,
+ mit_samba_get_nextkey,
+ mit_samba_get_pac_data,
+ mit_samba_update_pac_data,
+ mit_samba_check_client_access,
+ mit_samba_check_s4u2proxy
+};
generated by cgit (git 2.34.1) at 2024-11-17 19:55:33 +0000