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> 2005-2009
   7    Copyright (C) Simo Sorce <idra@samba.org> 2010
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "../libds/common/flags.h"
  26 #include <ldb.h>
  27 #include "auth/auth.h"
  28 #include "auth/auth_sam_reply.h"
  29 #include "kdc/kdc-glue.h"
  30 #include "kdc/pac-glue.h"
  31 #include "param/param.h"
  32 #include "librpc/gen_ndr/ndr_krb5pac.h"
  33
  34 static
  35 NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
  36                                        struct auth_user_info_dc *info,
  37                                        DATA_BLOB *pac_data)
  38 {
  39         struct netr_SamInfo3 *info3;
  40         union PAC_INFO pac_info;
  41         enum ndr_err_code ndr_err;
  42         NTSTATUS nt_status;
  43
  44         ZERO_STRUCT(pac_info);
  45
  46         nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx, info, &info3);
  47         if (!NT_STATUS_IS_OK(nt_status)) {
  48                 DEBUG(1, ("Getting Samba info failed: %s\n",
  49                           nt_errstr(nt_status)));
  50                 return nt_status;
  51         }
  52
  53         pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  54         if (!mem_ctx) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         pac_info.logon_info.info->info3 = *info3;
  59
  60         ndr_err = ndr_push_union_blob(pac_data, mem_ctx, &pac_info,
  61                                       PAC_TYPE_LOGON_INFO,
  62                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  63         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  64                 nt_status = ndr_map_error2ntstatus(ndr_err);
  65                 DEBUG(1, ("PAC (presig) push failed: %s\n",
  66                           nt_errstr(nt_status)));
  67                 return nt_status;
  68         }
  69
  70         return NT_STATUS_OK;
  71 }
  72
  73 krb5_error_code samba_make_krb5_pac(krb5_context context,
  74                                     DATA_BLOB *pac_blob,
  75                                     krb5_pac *pac)
  76 {
  77         krb5_data pac_data;
  78         krb5_error_code ret;
  79
  80         /* The user account may be set not to want the PAC */
  81         if (!pac_blob) {
  82                 return 0;
  83         }
  84
  85         ret = krb5_data_copy(&pac_data, pac_blob->data, pac_blob->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 bool samba_princ_needs_pac(struct hdb_entry_ex *princ)
 106 {
 107
 108         struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
 109         uint32_t userAccountControl;
 110
 111
 112         /* The service account may be set not to want the PAC */
 113         userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
 114         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 115                 return false;
 116         }
 117
 118         return true;
 119 }
 120
 121 /* Was the krbtgt an RODC (and we are not) */
 122 bool samba_krbtgt_was_untrusted_rodc(struct hdb_entry_ex *princ)
 123 {
 124
 125         struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
 126         int rodc_krbtgt_number;
 127
 128         /* Determine if this was printed by an RODC */
 129         rodc_krbtgt_number = ldb_msg_find_attr_as_int(p->msg, "msDS-SecondaryKrbTgtNumber", -1);
 130         if (rodc_krbtgt_number == -1) {
 131                 return false;
 132         } else if (rodc_krbtgt_number != p->kdc_db_ctx->my_krbtgt_number) {
 133                 return true;
 134         }
 135
 136         return false;
 137 }
 138
 139 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 140                                 struct hdb_entry_ex *client,
 141                                 DATA_BLOB **_pac_blob)
 142 {
 143         struct samba_kdc_entry *p = talloc_get_type(client->ctx, struct samba_kdc_entry);
 144         struct auth_user_info_dc *user_info_dc;
 145         DATA_BLOB *pac_blob;
 146         NTSTATUS nt_status;
 147
 148         /* The user account may be set not to want the PAC */
 149         if ( ! samba_princ_needs_pac(client)) {
 150                 *_pac_blob = NULL;
 151                 return NT_STATUS_OK;
 152         }
 153
 154         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
 155         if (!pac_blob) {
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158
 159         nt_status = authsam_make_user_info_dc(mem_ctx, p->kdc_db_ctx->samdb,
 160                                              lpcfg_netbios_name(p->kdc_db_ctx->lp_ctx),
 161                                              lpcfg_sam_name(p->kdc_db_ctx->lp_ctx),
 162                                              p->realm_dn,
 163                                              p->msg,
 164                                              data_blob(NULL, 0),
 165                                              data_blob(NULL, 0),
 166                                              &user_info_dc);
 167         if (!NT_STATUS_IS_OK(nt_status)) {
 168                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 169                           nt_errstr(nt_status)));
 170                 return nt_status;
 171         }
 172
 173         nt_status = samba_get_logon_info_pac_blob(mem_ctx, user_info_dc, pac_blob);
 174         if (!NT_STATUS_IS_OK(nt_status)) {
 175                 DEBUG(0, ("Building PAC failed: %s\n",
 176                           nt_errstr(nt_status)));
 177                 return nt_status;
 178         }
 179
 180         *_pac_blob = pac_blob;
 181         return NT_STATUS_OK;
 182 }
 183
 184 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 185                                    krb5_context context,
 186                                    krb5_pac *pac, DATA_BLOB *pac_blob)
 187 {
 188         struct auth_user_info_dc *user_info_dc;
 189         krb5_error_code ret;
 190         NTSTATUS nt_status;
 191
 192         ret = kerberos_pac_to_user_info_dc(mem_ctx, *pac,
 193                                            context, &user_info_dc, NULL, NULL);
 194         if (ret) {
 195                 return NT_STATUS_UNSUCCESSFUL;
 196         }
 197
 198         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 199                                                   user_info_dc, pac_blob);
 200
 201         return nt_status;
 202 }
 203
 204 /* this function allocates 'data' using malloc.
 205  * The caller is responsible for freeing it */
 206 void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
 207 {
 208         PA_DATA pa;
 209         unsigned char *buf;
 210         size_t len;
 211         krb5_error_code ret = 0;
 212
 213         if (!e_data)
 214                 return;
 215
 216         pa.padata_type          = KRB5_PADATA_PW_SALT;
 217         pa.padata_value.length  = 12;
 218         pa.padata_value.data    = malloc(pa.padata_value.length);
 219         if (!pa.padata_value.data) {
 220                 e_data->length = 0;
 221                 e_data->data = NULL;
 222                 return;
 223         }
 224
 225         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 226         SIVAL(pa.padata_value.data, 4, 0);
 227         SIVAL(pa.padata_value.data, 8, 1);
 228
 229         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 230         free(pa.padata_value.data);
 231
 232         e_data->data   = buf;
 233         e_data->length = len;
 234
 235         return;
 236 }
 237
 238 /* function to map policy errors */
 239 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 240 {
 241         krb5_error_code ret;
 242
 243         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 244                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 245         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 246                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 247         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 248                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 249         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 250                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 251         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 252                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 253         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 254                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 255         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 256                 ret = KRB5KDC_ERR_POLICY;
 257         else
 258                 ret = KRB5KDC_ERR_POLICY;
 259
 260         return ret;
 261 }
 262
 263 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 264  * for consistency */
 265 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 266                                        const char *client_name,
 267                                        const char *workstation,
 268                                        bool password_change)
 269 {
 270         TALLOC_CTX *tmp_ctx;
 271         NTSTATUS nt_status;
 272
 273         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 274         if (!tmp_ctx) {
 275                 return NT_STATUS_NO_MEMORY;
 276         }
 277
 278         /* we allow all kinds of trusts here */
 279         nt_status = authsam_account_ok(tmp_ctx,
 280                                        kdc_entry->kdc_db_ctx->samdb,
 281                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 282                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 283                                        kdc_entry->realm_dn, kdc_entry->msg,
 284                                        workstation, client_name,
 285                                        true, password_change);
 286
 287         talloc_free(tmp_ctx);
 288         return nt_status;
 289 }
 290