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 "param/param.h"
  32 #include "kdc/kdc.h"
  33
  34 struct krb5_dh_moduli;
  35 struct _krb5_krb_auth_data;
  36
  37 krb5_error_code samba_kdc_plugin_init(krb5_context context, void **ptr)
  38 {
  39         *ptr = NULL;
  40         return 0;
  41 }
  42
  43 void    samba_kdc_plugin_fini(void *ptr)
  44 {
  45         return;
  46 }
  47
  48 static krb5_error_code make_pac(krb5_context context,
  49                                 TALLOC_CTX *mem_ctx,
  50                                 struct smb_iconv_convenience *iconv_convenience,
  51                                 struct auth_serversupplied_info *server_info,
  52                                 krb5_pac *pac)
  53 {
  54         union PAC_INFO info;
  55         struct netr_SamInfo3 *info3;
  56         krb5_data pac_data;
  57         NTSTATUS nt_status;
  58         enum ndr_err_code ndr_err;
  59         DATA_BLOB pac_out;
  60         krb5_error_code ret;
  61
  62         ZERO_STRUCT(info);
  63
  64         nt_status = auth_convert_server_info_saminfo3(mem_ctx, server_info, &info3);
  65         if (!NT_STATUS_IS_OK(nt_status)) {
  66                 DEBUG(1, ("Getting Samba info failed: %s\n", nt_errstr(nt_status)));
  67                 return EINVAL;
  68         }
  69
  70         info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  71         if (!mem_ctx) {
  72                 return ENOMEM;
  73         }
  74
  75         info.logon_info.info->info3 = *info3;
  76
  77         ndr_err = ndr_push_union_blob(&pac_out, mem_ctx, iconv_convenience, &info,
  78                                       PAC_TYPE_LOGON_INFO,
  79                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  80         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  81                 nt_status = ndr_map_error2ntstatus(ndr_err);
  82                 DEBUG(1, ("PAC (presig) push failed: %s\n", nt_errstr(nt_status)));
  83                 return EINVAL;
  84         }
  85
  86         ret = krb5_data_copy(&pac_data, pac_out.data, pac_out.length);
  87         if (ret != 0) {
  88                 return ret;
  89         }
  90
  91         ret = krb5_pac_init(context, pac);
  92         if (ret != 0) {
  93                 krb5_data_free(&pac_data);
  94                 return ret;
  95         }
  96
  97         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
  98         krb5_data_free(&pac_data);
  99         if (ret != 0) {
 100                 return ret;
 101         }
 102
 103         return ret;
 104 }
 105
 106 /* Given the right private pointer from hdb_ldb, get a PAC from the attached ldb messages */
 107 krb5_error_code samba_kdc_get_pac(void *priv,
 108                                   krb5_context context,
 109                                   struct hdb_entry_ex *client,
 110                                   krb5_pac *pac)
 111 {
 112         krb5_error_code ret;
 113         NTSTATUS nt_status;
 114         struct auth_serversupplied_info *server_info;
 115         struct hdb_ldb_private *private = talloc_get_type(client->ctx, struct hdb_ldb_private);
 116         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
 117         unsigned int userAccountControl;
 118
 119         if (!mem_ctx) {
 120                 return ENOMEM;
 121         }
 122
 123         /* The user account may be set not to want the PAC */
 124         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
 125         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 126                 *pac = NULL;
 127                 return 0;
 128         }
 129
 130         nt_status = authsam_make_server_info(mem_ctx, private->samdb,
 131                                              private->netbios_name,
 132                                              private->msg,
 133                                              private->realm_ref_msg,
 134                                              data_blob(NULL, 0),
 135                                              data_blob(NULL, 0),
 136                                              &server_info);
 137         if (!NT_STATUS_IS_OK(nt_status)) {
 138                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 139                           nt_errstr(nt_status)));
 140                 return ENOMEM;
 141         }
 142
 143         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info, pac);
 144
 145         talloc_free(mem_ctx);
 146         return ret;
 147 }
 148
 149 /* Resign (and reform, including possibly new groups) a PAC */
 150
 151 krb5_error_code samba_kdc_reget_pac(void *priv, krb5_context context,
 152                                 const krb5_principal client_principal,
 153                                 struct hdb_entry_ex *client,
 154                                 struct hdb_entry_ex *server, krb5_pac *pac)
 155 {
 156         NTSTATUS nt_status;
 157         enum ndr_err_code ndr_err;
 158         krb5_error_code ret;
 159
 160         unsigned int userAccountControl;
 161
 162         struct hdb_ldb_private *private = talloc_get_type(server->ctx, struct hdb_ldb_private);
 163         krb5_data k5pac_in;
 164         DATA_BLOB pac_in;
 165
 166         union PAC_INFO info;
 167         union netr_Validation validation;
 168         struct auth_serversupplied_info *server_info_out;
 169
 170         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
 171
 172         if (!mem_ctx) {
 173                 return ENOMEM;
 174         }
 175
 176         /* The service account may be set not to want the PAC */
 177         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
 178         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 179                 *pac = NULL;
 180                 return 0;
 181         }
 182
 183         ret = krb5_pac_get_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &k5pac_in);
 184         if (ret != 0) {
 185                 return ret;
 186         }
 187
 188         pac_in = data_blob_talloc(mem_ctx, k5pac_in.data, k5pac_in.length);
 189         krb5_data_free(&k5pac_in);
 190         if (!pac_in.data) {
 191                 talloc_free(mem_ctx);
 192                 return ENOMEM;
 193         }
 194
 195         ndr_err = ndr_pull_union_blob(&pac_in, mem_ctx, private->iconv_convenience, &info,
 196                                       PAC_TYPE_LOGON_INFO,
 197                                       (ndr_pull_flags_fn_t)ndr_pull_PAC_INFO);
 198         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !info.logon_info.info) {
 199                 nt_status = ndr_map_error2ntstatus(ndr_err);
 200                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 201                 talloc_free(mem_ctx);
 202                 return EINVAL;
 203         }
 204
 205         /* Pull this right into the normal auth sysstem structures */
 206         validation.sam3 = &info.logon_info.info->info3;
 207         nt_status = make_server_info_netlogon_validation(mem_ctx,
 208                                                          "",
 209                                                          3, &validation,
 210                                                          &server_info_out);
 211         if (!NT_STATUS_IS_OK(nt_status)) {
 212                 talloc_free(mem_ctx);
 213                 return ENOMEM;
 214         }
 215
 216         /* We will compleatly regenerate this pac */
 217         krb5_pac_free(context, *pac);
 218
 219         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info_out, pac);
 220
 221         talloc_free(mem_ctx);
 222         return ret;
 223 }
 224
 225 static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
 226                                        NTSTATUS nt_status)
 227 {
 228         PA_DATA pa;
 229         unsigned char *buf;
 230         size_t len;
 231         krb5_error_code ret = 0;
 232
 233         if (!e_data)
 234                 return;
 235
 236         pa.padata_type          = KRB5_PADATA_PW_SALT;
 237         pa.padata_value.length  = 12;
 238         pa.padata_value.data    = malloc(pa.padata_value.length);
 239         if (!pa.padata_value.data) {
 240                 e_data->length = 0;
 241                 e_data->data = NULL;
 242                 return;
 243         }
 244
 245         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 246         SIVAL(pa.padata_value.data, 4, 0);
 247         SIVAL(pa.padata_value.data, 8, 1);
 248
 249         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 250         free(pa.padata_value.data);
 251
 252         e_data->data   = buf;
 253         e_data->length = len;
 254
 255         return;
 256 }
 257
 258 /* Given an hdb entry (and in particular it's private member), consult
 259  * the account_ok routine in auth/auth_sam.c for consistancy */
 260
 261
 262 krb5_error_code samba_kdc_check_client_access(void *priv,
 263                                               krb5_context context, hdb_entry_ex *entry_ex,
 264                                               KDC_REQ *req,
 265                                               krb5_data *e_data)
 266 {
 267         krb5_error_code ret;
 268         NTSTATUS nt_status;
 269         TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
 270         struct hdb_ldb_private *private = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
 271         char *name, *workstation = NULL;
 272         HostAddresses *addresses = req->req_body.addresses;
 273         int i;
 274
 275         if (!tmp_ctx) {
 276                 return ENOMEM;
 277         }
 278
 279         ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
 280         if (ret != 0) {
 281                 talloc_free(tmp_ctx);
 282                 return ret;
 283         }
 284
 285         if (addresses) {
 286                 for (i=0; i < addresses->len; i++) {
 287                         if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
 288                                 workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
 289                                 if (workstation) {
 290                                         break;
 291                                 }
 292                         }
 293                 }
 294         }
 295
 296         /* Strip space padding */
 297         if (workstation) {
 298                 i = MIN(strlen(workstation), 15);
 299                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
 300                         workstation[i - 1] = '\0';
 301                 }
 302         }
 303
 304         nt_status = authsam_account_ok(tmp_ctx,
 305                                        private->samdb,
 306                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 307                                        private->msg,
 308                                        private->realm_ref_msg,
 309                                        workstation,
 310                                        name);
 311         free(name);
 312
 313         if (NT_STATUS_IS_OK(nt_status))
 314                 return 0;
 315
 316         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 317                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 318         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 319                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 320         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 321                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 322         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 323                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 324         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 325                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 326         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 327                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 328         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 329                 ret = KRB5KDC_ERR_POLICY;
 330         else
 331                 ret = KRB5KDC_ERR_POLICY;
 332
 333         samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
 334
 335         return ret;
 336 }
 337