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https://github.com/samba-team/samba.git
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7a23b9769b
Signed-off-by: Matthias Dieter Wallnöfer <mwallnoefer@yahoo.de>
212 lines
5.2 KiB
C
212 lines
5.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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PAC Glue between Samba and the KDC
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2009
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Copyright (C) Simo Sorce <idra@samba.org> 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 "../libds/common/flags.h"
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#include "auth/auth.h"
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#include "kdc/kdc.h"
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#include "param/param.h"
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#include "kdc/pac-glue.h"
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/* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */
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static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context,
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struct hdb_entry_ex *client,
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krb5_pac *pac)
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{
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TALLOC_CTX *mem_ctx;
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DATA_BLOB *pac_blob;
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krb5_error_code ret;
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NTSTATUS nt_status;
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mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context");
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if (!mem_ctx) {
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return ENOMEM;
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}
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nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
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if (!NT_STATUS_IS_OK(nt_status)) {
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talloc_free(mem_ctx);
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return EINVAL;
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}
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ret = samba_make_krb5_pac(context, pac_blob, pac);
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talloc_free(mem_ctx);
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return ret;
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}
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/* Resign (and reform, including possibly new groups) a PAC */
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static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context,
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const krb5_principal client_principal,
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struct hdb_entry_ex *client,
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struct hdb_entry_ex *server, krb5_pac *pac)
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{
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struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry);
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TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context");
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DATA_BLOB *pac_blob;
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krb5_error_code ret;
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NTSTATUS nt_status;
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if (!mem_ctx) {
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return ENOMEM;
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}
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pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
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if (!pac_blob) {
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talloc_free(mem_ctx);
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return ENOMEM;
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}
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/* The user account may be set not to want the PAC */
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if (!samba_princ_needs_pac(server)) {
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talloc_free(mem_ctx);
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return EINVAL;
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}
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nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
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p->kdc_db_ctx->ic_ctx,
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pac, pac_blob);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(0, ("Building PAC failed: %s\n",
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nt_errstr(nt_status)));
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talloc_free(mem_ctx);
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return EINVAL;
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}
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/* We now completely regenerate this pac */
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krb5_pac_free(context, *pac);
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ret = samba_make_krb5_pac(context, pac_blob, pac);
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talloc_free(mem_ctx);
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return ret;
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}
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static char *get_netbios_name(TALLOC_CTX *mem_ctx, HostAddresses *addrs)
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{
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char *nb_name = NULL;
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int len, i;
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for (i = 0; addrs && i < addrs->len; i++) {
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if (addrs->val[i].addr_type != KRB5_ADDRESS_NETBIOS) {
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continue;
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}
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len = MIN(addrs->val[i].address.length, 15);
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nb_name = talloc_strndup(mem_ctx,
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addrs->val[i].address.data, len);
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if (nb_name) {
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break;
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}
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}
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if (nb_name == NULL) {
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return NULL;
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}
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/* Strip space padding */
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i = strlen(nb_name) - 1;
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while (i > 0 && nb_name[i] == ' ') {
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nb_name[i] = '\0';
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}
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return nb_name;
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}
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static krb5_data fill_krb5_data(void *data, size_t length)
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{
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krb5_data kdata;
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kdata.data = data;
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kdata.length = length;
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return kdata;
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}
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static krb5_error_code samba_wdc_check_client_access(void *priv,
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krb5_context context,
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krb5_kdc_configuration *config,
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hdb_entry_ex *client_ex, const char *client_name,
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hdb_entry_ex *server_ex, const char *server_name,
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KDC_REQ *req,
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krb5_data *e_data)
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{
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struct samba_kdc_entry *kdc_entry;
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bool password_change;
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char *workstation;
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NTSTATUS nt_status;
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kdc_entry = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);
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password_change = (server_ex && server_ex->entry.flags.change_pw);
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workstation = get_netbios_name((TALLOC_CTX *)client_ex->ctx,
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req->req_body.addresses);
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nt_status = samba_kdc_check_client_access(kdc_entry,
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client_name,
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workstation,
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password_change);
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if (!NT_STATUS_IS_OK(nt_status)) {
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if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_MEMORY)) {
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return ENOMEM;
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}
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if (e_data) {
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DATA_BLOB data;
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samba_kdc_build_edata_reply(nt_status, &data);
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*e_data = fill_krb5_data(data.data, data.length);
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}
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return samba_kdc_map_policy_err(nt_status);
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}
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/* Now do the standard Heimdal check */
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return kdc_check_flags(context, config,
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client_ex, client_name,
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server_ex, server_name,
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req->msg_type == krb_as_req);
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}
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static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr)
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{
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*ptr = NULL;
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return 0;
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}
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static void samba_wdc_plugin_fini(void *ptr)
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{
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return;
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}
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struct krb5plugin_windc_ftable windc_plugin_table = {
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.minor_version = KRB5_WINDC_PLUGING_MINOR,
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.init = samba_wdc_plugin_init,
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.fini = samba_wdc_plugin_fini,
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.pac_generate = samba_wdc_get_pac,
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.pac_verify = samba_wdc_reget_pac,
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.client_access = samba_wdc_check_client_access,
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};
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