source4/kdc/pac-glue.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    PAC Glue between Samba and the KDC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "dsdb/common/flags.h"
  25 #include "lib/ldb/include/ldb.h"
  26 #include "librpc/gen_ndr/ndr_krb5pac.h"
  27 #include "librpc/gen_ndr/krb5pac.h"
  28 #include "auth/auth.h"
  29 #include "auth/auth_sam.h"
  30 #include "auth/auth_sam_reply.h"
  31 #include "kdc/kdc.h"
  32
  33 struct krb5_dh_moduli;
  34 struct _krb5_krb_auth_data;
  35
  36 krb5_error_code samba_kdc_plugin_init(krb5_context context, void **ptr)
  37 {
  38         *ptr = NULL;
  39         return 0;
  40 }
  41
  42 void    samba_kdc_plugin_fini(void *ptr)
  43 {
  44         return;
  45 }
  46
  47 static krb5_error_code make_pac(krb5_context context,
  48                                 TALLOC_CTX *mem_ctx,
  49                                 struct smb_iconv_convenience *iconv_convenience,
  50                                 struct auth_serversupplied_info *server_info,
  51                                 krb5_pac *pac)
  52 {
  53         union PAC_INFO info;
  54         struct netr_SamInfo3 *info3;
  55         krb5_data pac_data;
  56         NTSTATUS nt_status;
  57         enum ndr_err_code ndr_err;
  58         DATA_BLOB pac_out;
  59         krb5_error_code ret;
  60
  61         ZERO_STRUCT(info);
  62
  63         nt_status = auth_convert_server_info_saminfo3(mem_ctx, server_info, &info3);
  64         if (!NT_STATUS_IS_OK(nt_status)) {
  65                 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
  66                 return EINVAL;
  67         }
  68
  69         info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  70         if (!mem_ctx) {
  71                 return ENOMEM;
  72         }
  73
  74         info.logon_info.info->info3 = *info3;
  75
  76         ndr_err = ndr_push_union_blob(&pac_out, mem_ctx, iconv_convenience, &info,
  77                                       PAC_TYPE_LOGON_INFO,
  78                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  79         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  80                 nt_status = ndr_map_error2ntstatus(ndr_err);
  81                 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
  82                 return EINVAL;
  83         }
  84
  85         ret = krb5_data_copy(&pac_data, pac_out.data, pac_out.length);
  86         if (ret != 0) {
  87                 return ret;
  88         }
  89
  90         ret = krb5_pac_init(context, pac);
  91         if (ret != 0) {
  92                 krb5_data_free(&pac_data);
  93                 return ret;
  94         }
  95
  96         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
  97         krb5_data_free(&pac_data);
  98         if (ret != 0) {
  99                 return ret;
 100         }
 101
 102         return ret;
 103 }
 104
 105 /* Given the right private pointer from hdb_ldb, get a PAC from the attached ldb messages */
 106 krb5_error_code samba_kdc_get_pac(void *priv,
 107                                   krb5_context context,
 108                                   struct hdb_entry_ex *client,
 109                                   krb5_pac *pac)
 110 {
 111         krb5_error_code ret;
 112         NTSTATUS nt_status;
 113         struct auth_serversupplied_info *server_info;
 114         struct hdb_ldb_private *private = talloc_get_type(client->ctx, struct hdb_ldb_private);
 115         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
 116         unsigned int userAccountControl;
 117
 118         if (!mem_ctx) {
 119                 return ENOMEM;
 120         }
 121
 122         /* The user account may be set not to want the PAC */
 123         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
 124         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 125                 *pac = NULL;
 126                 return 0;
 127         }
 128
 129         nt_status = authsam_make_server_info(mem_ctx, private->samdb,
 130                                              private->netbios_name,
 131                                              private->msg,
 132                                              private->realm_ref_msg,
 133                                              data_blob(NULL, 0),
 134                                              data_blob(NULL, 0),
 135                                              &server_info);
 136         if (!NT_STATUS_IS_OK(nt_status)) {
 137                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 138                           nt_errstr(nt_status)));
 139                 return ENOMEM;
 140         }
 141
 142         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info, pac);
 143
 144         talloc_free(mem_ctx);
 145         return ret;
 146 }
 147
 148 /* Resign (and reform, including possibly new groups) a PAC */
 149
 150 krb5_error_code samba_kdc_reget_pac(void *priv, krb5_context context,
 151                                 const krb5_principal client_principal,
 152                                 struct hdb_entry_ex *client,
 153                                 struct hdb_entry_ex *server, krb5_pac *pac)
 154 {
 155         krb5_error_code ret;
 156
 157         unsigned int userAccountControl;
 158
 159         struct hdb_ldb_private *private = talloc_get_type(server->ctx, struct hdb_ldb_private);
 160
 161         struct auth_serversupplied_info *server_info_out;
 162
 163         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
 164
 165         if (!mem_ctx) {
 166                 return ENOMEM;
 167         }
 168
 169         /* The service account may be set not to want the PAC */
 170         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
 171         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 172                 talloc_free(mem_ctx);
 173                 *pac = NULL;
 174                 return 0;
 175         }
 176
 177         ret = kerberos_pac_to_server_info(mem_ctx, private->iconv_convenience,
 178                                           *pac, context, &server_info_out);
 179
 180         /* We will compleatly regenerate this pac */
 181         krb5_pac_free(context, *pac);
 182
 183         if (ret) {
 184                 talloc_free(mem_ctx);
 185                 return ret;
 186         }
 187
 188         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info_out, pac);
 189
 190         talloc_free(mem_ctx);
 191         return ret;
 192 }
 193
 194 static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
 195                                        NTSTATUS nt_status)
 196 {
 197         PA_DATA pa;
 198         unsigned char *buf;
 199         size_t len;
 200         krb5_error_code ret = 0;
 201
 202         if (!e_data)
 203                 return;
 204
 205         pa.padata_type          = KRB5_PADATA_PW_SALT;
 206         pa.padata_value.length  = 12;
 207         pa.padata_value.data    = malloc(pa.padata_value.length);
 208         if (!pa.padata_value.data) {
 209                 e_data->length = 0;
 210                 e_data->data = NULL;
 211                 return;
 212         }
 213
 214         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 215         SIVAL(pa.padata_value.data, 4, 0);
 216         SIVAL(pa.padata_value.data, 8, 1);
 217
 218         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 219         free(pa.padata_value.data);
 220
 221         e_data->data   = buf;
 222         e_data->length = len;
 223
 224         return;
 225 }
 226
 227 /* Given an hdb entry (and in particular it's private member), consult
 228  * the account_ok routine in auth/auth_sam.c for consistancy */
 229
 230
 231 krb5_error_code samba_kdc_check_client_access(void *priv,
 232                                               krb5_context context, hdb_entry_ex *entry_ex,
 233                                               KDC_REQ *req,
 234                                               krb5_data *e_data)
 235 {
 236         krb5_error_code ret;
 237         NTSTATUS nt_status;
 238         TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
 239         struct hdb_ldb_private *private = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
 240         char *name, *workstation = NULL;
 241         HostAddresses *addresses = req->req_body.addresses;
 242         int i;
 243
 244         if (!tmp_ctx) {
 245                 return ENOMEM;
 246         }
 247
 248         ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
 249         if (ret != 0) {
 250                 talloc_free(tmp_ctx);
 251                 return ret;
 252         }
 253
 254         if (addresses) {
 255                 for (i=0; i < addresses->len; i++) {
 256                         if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
 257                                 workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
 258                                 if (workstation) {
 259                                         break;
 260                                 }
 261                         }
 262                 }
 263         }
 264
 265         /* Strip space padding */
 266         if (workstation) {
 267                 i = MIN(strlen(workstation), 15);
 268                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
 269                         workstation[i - 1] = '\0';
 270                 }
 271         }
 272
 273         /* we allow all kinds of trusts here */
 274         nt_status = authsam_account_ok(tmp_ctx,
 275                                        private->samdb,
 276                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 277                                        private->msg,
 278                                        private->realm_ref_msg,
 279                                        workstation,
 280                                        name, true);
 281         free(name);
 282
 283         if (NT_STATUS_IS_OK(nt_status))
 284                 return 0;
 285
 286         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 287                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 288         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 289                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 290         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 291                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 292         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 293                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 294         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 295                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 296         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 297                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 298         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 299                 ret = KRB5KDC_ERR_POLICY;
 300         else
 301                 ret = KRB5KDC_ERR_POLICY;
 302
 303         samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
 304
 305         return ret;
 306 }
 307