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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
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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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#include "dsdb/common/flags.h"
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#include "lib/ldb/include/ldb.h"
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#include "librpc/gen_ndr/ndr_krb5pac.h"
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#include "librpc/gen_ndr/krb5pac.h"
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#include "auth/auth.h"
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#include "auth/auth_sam.h"
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#include "auth/auth_sam_reply.h"
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struct krb5_dh_moduli;
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struct _krb5_krb_auth_data;
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krb5_error_code samba_kdc_plugin_init(krb5_context context, void **ptr)
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void samba_kdc_plugin_fini(void *ptr)
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static krb5_error_code make_pac(krb5_context context,
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struct smb_iconv_convenience *iconv_convenience,
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struct auth_serversupplied_info *server_info,
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struct netr_SamInfo3 *info3;
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enum ndr_err_code ndr_err;
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nt_status = auth_convert_server_info_saminfo3(mem_ctx, server_info, &info3);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
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info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
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info.logon_info.info->info3 = *info3;
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ndr_err = ndr_push_union_blob(&pac_out, mem_ctx, iconv_convenience, &info,
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(ndr_push_flags_fn_t)ndr_push_PAC_INFO);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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nt_status = ndr_map_error2ntstatus(ndr_err);
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DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
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ret = krb5_data_copy(&pac_data, pac_out.data, pac_out.length);
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ret = krb5_pac_init(context, pac);
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krb5_data_free(&pac_data);
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ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
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krb5_data_free(&pac_data);
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/* Given the right private pointer from hdb_ldb, get a PAC from the attached ldb messages */
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krb5_error_code samba_kdc_get_pac(void *priv,
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krb5_context context,
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struct hdb_entry_ex *client,
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struct auth_serversupplied_info *server_info;
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struct hdb_ldb_private *p = talloc_get_type(client->ctx, struct hdb_ldb_private);
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TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_get_pac context");
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unsigned int userAccountControl;
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/* The user account may be set not to want the PAC */
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userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
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if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
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nt_status = authsam_make_server_info(mem_ctx, p->samdb,
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(0, ("Getting user info for PAC failed: %s\n",
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nt_errstr(nt_status)));
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ret = make_pac(context, mem_ctx, p->iconv_convenience, server_info, pac);
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talloc_free(mem_ctx);
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/* Resign (and reform, including possibly new groups) a PAC */
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krb5_error_code samba_kdc_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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unsigned int userAccountControl;
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struct hdb_ldb_private *p = talloc_get_type(server->ctx, struct hdb_ldb_private);
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struct auth_serversupplied_info *server_info_out;
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TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_get_pac context");
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/* The service account may be set not to want the PAC */
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userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
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if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
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talloc_free(mem_ctx);
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ret = kerberos_pac_to_server_info(mem_ctx, p->iconv_convenience,
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*pac, context, &server_info_out);
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/* We will compleatly regenerate this pac */
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krb5_pac_free(context, *pac);
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talloc_free(mem_ctx);
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ret = make_pac(context, mem_ctx, p->iconv_convenience, server_info_out, pac);
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talloc_free(mem_ctx);
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static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
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krb5_error_code ret = 0;
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pa.padata_type = KRB5_PADATA_PW_SALT;
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pa.padata_value.length = 12;
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pa.padata_value.data = malloc(pa.padata_value.length);
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if (!pa.padata_value.data) {
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SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
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SIVAL(pa.padata_value.data, 4, 0);
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SIVAL(pa.padata_value.data, 8, 1);
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ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
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free(pa.padata_value.data);
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e_data->length = len;
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/* Given an hdb entry (and in particular it's private member), consult
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* the account_ok routine in auth/auth_sam.c for consistancy */
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krb5_error_code samba_kdc_check_client_access(void *priv,
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krb5_context context, hdb_entry_ex *entry_ex,
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TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
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struct hdb_ldb_private *p = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
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char *name, *workstation = NULL;
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HostAddresses *addresses = req->req_body.addresses;
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ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
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talloc_free(tmp_ctx);
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for (i=0; i < addresses->len; i++) {
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if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
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workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
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/* Strip space padding */
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i = MIN(strlen(workstation), 15);
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for (; i > 0 && workstation[i - 1] == ' '; i--) {
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workstation[i - 1] = '\0';
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/* we allow all kinds of trusts here */
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nt_status = authsam_account_ok(tmp_ctx,
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MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
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if (NT_STATUS_IS_OK(nt_status))
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if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
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ret = KRB5KDC_ERR_KEY_EXPIRED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
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ret = KRB5KDC_ERR_KEY_EXPIRED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
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ret = KRB5KDC_ERR_CLIENT_REVOKED;
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else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
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ret = KRB5KDC_ERR_POLICY;
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ret = KRB5KDC_ERR_POLICY;
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samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);