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         struct PAC_LOGON_INFO_CTR logon_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(logon_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         logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  71         if (!mem_ctx) {
  72                 return ENOMEM;
  73         }
  74
  75         logon_info.info->info3 = *info3;
  76
  77         ndr_err = ndr_push_struct_blob(&pac_out, mem_ctx, iconv_convenience, &logon_info,
  78                                        (ndr_push_flags_fn_t)ndr_push_PAC_LOGON_INFO_CTR);
  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         NTSTATUS nt_status;
 156         enum ndr_err_code ndr_err;
 157         krb5_error_code ret;
 158
 159         unsigned int userAccountControl;
 160
 161         struct hdb_ldb_private *private = talloc_get_type(server->ctx, struct hdb_ldb_private);
 162         krb5_data k5pac_in;
 163         DATA_BLOB pac_in;
 164
 165         struct PAC_LOGON_INFO_CTR logon_info;
 166         union netr_Validation validation;
 167         struct auth_serversupplied_info *server_info_out;
 168
 169         TALLOC_CTX *mem_ctx = talloc_named(private, 0, "samba_get_pac context");
 170
 171         if (!mem_ctx) {
 172                 return ENOMEM;
 173         }
 174
 175         /* The service account may be set not to want the PAC */
 176         userAccountControl = ldb_msg_find_attr_as_uint(private->msg, "userAccountControl", 0);
 177         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 178                 *pac = NULL;
 179                 return 0;
 180         }
 181
 182         ret = krb5_pac_get_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &k5pac_in);
 183         if (ret != 0) {
 184                 return ret;
 185         }
 186
 187         pac_in = data_blob_talloc(mem_ctx, k5pac_in.data, k5pac_in.length);
 188         krb5_data_free(&k5pac_in);
 189         if (!pac_in.data) {
 190                 talloc_free(mem_ctx);
 191                 return ENOMEM;
 192         }
 193
 194         ndr_err = ndr_pull_struct_blob(&pac_in, mem_ctx, private->iconv_convenience, &logon_info,
 195                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_LOGON_INFO_CTR);
 196         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err) || !logon_info.info) {
 197                 nt_status = ndr_map_error2ntstatus(ndr_err);
 198                 DEBUG(0,("can't parse the PAC LOGON_INFO: %s\n", nt_errstr(nt_status)));
 199                 talloc_free(mem_ctx);
 200                 return EINVAL;
 201         }
 202
 203         /* Pull this right into the normal auth sysstem structures */
 204         validation.sam3 = &logon_info.info->info3;
 205         nt_status = make_server_info_netlogon_validation(mem_ctx,
 206                                                          "",
 207                                                          3, &validation,
 208                                                          &server_info_out);
 209         if (!NT_STATUS_IS_OK(nt_status)) {
 210                 talloc_free(mem_ctx);
 211                 return ENOMEM;
 212         }
 213
 214         /* We will compleatly regenerate this pac */
 215         krb5_pac_free(context, *pac);
 216
 217         ret = make_pac(context, mem_ctx, private->iconv_convenience, server_info_out, pac);
 218
 219         talloc_free(mem_ctx);
 220         return ret;
 221 }
 222
 223 static void samba_kdc_build_edata_reply(TALLOC_CTX *tmp_ctx, krb5_data *e_data,
 224                                        NTSTATUS nt_status)
 225 {
 226         PA_DATA pa;
 227         unsigned char *buf;
 228         size_t len;
 229         krb5_error_code ret = 0;
 230
 231         if (!e_data)
 232                 return;
 233
 234         pa.padata_type          = KRB5_PADATA_PW_SALT;
 235         pa.padata_value.length  = 12;
 236         pa.padata_value.data    = malloc(pa.padata_value.length);
 237         if (!pa.padata_value.data) {
 238                 e_data->length = 0;
 239                 e_data->data = NULL;
 240                 return;
 241         }
 242
 243         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 244         SIVAL(pa.padata_value.data, 4, 0);
 245         SIVAL(pa.padata_value.data, 8, 1);
 246
 247         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 248         free(pa.padata_value.data);
 249
 250         e_data->data   = buf;
 251         e_data->length = len;
 252
 253         return;
 254 }
 255
 256 /* Given an hdb entry (and in particular it's private member), consult
 257  * the account_ok routine in auth/auth_sam.c for consistancy */
 258
 259
 260 krb5_error_code samba_kdc_check_client_access(void *priv,
 261                                               krb5_context context, hdb_entry_ex *entry_ex,
 262                                               KDC_REQ *req,
 263                                               krb5_data *e_data)
 264 {
 265         krb5_error_code ret;
 266         NTSTATUS nt_status;
 267         TALLOC_CTX *tmp_ctx = talloc_new(entry_ex->ctx);
 268         struct hdb_ldb_private *private = talloc_get_type(entry_ex->ctx, struct hdb_ldb_private);
 269         char *name, *workstation = NULL;
 270         HostAddresses *addresses = req->req_body.addresses;
 271         int i;
 272
 273         if (!tmp_ctx) {
 274                 return ENOMEM;
 275         }
 276
 277         ret = krb5_unparse_name(context, entry_ex->entry.principal, &name);
 278         if (ret != 0) {
 279                 talloc_free(tmp_ctx);
 280                 return ret;
 281         }
 282
 283         if (addresses) {
 284                 for (i=0; i < addresses->len; i++) {
 285                         if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
 286                                 workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
 287                                 if (workstation) {
 288                                         break;
 289                                 }
 290                         }
 291                 }
 292         }
 293
 294         /* Strip space padding */
 295         if (workstation) {
 296                 i = MIN(strlen(workstation), 15);
 297                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
 298                         workstation[i - 1] = '\0';
 299                 }
 300         }
 301
 302         nt_status = authsam_account_ok(tmp_ctx,
 303                                        private->samdb,
 304                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 305                                        private->msg,
 306                                        private->realm_ref_msg,
 307                                        workstation,
 308                                        name);
 309         free(name);
 310
 311         if (NT_STATUS_IS_OK(nt_status))
 312                 return 0;
 313
 314         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 315                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 316         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 317                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 318         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 319                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 320         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 321                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 322         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 323                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 324         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 325                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 326         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 327                 ret = KRB5KDC_ERR_POLICY;
 328         else
 329                 ret = KRB5KDC_ERR_POLICY;
 330
 331         samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
 332
 333         return ret;
 334 }
 335