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 "lib/ldb/include/ldb.h"
  27 #include "librpc/gen_ndr/ndr_krb5pac.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "auth/auth_sam.h"
  31 #include "auth/auth_sam_reply.h"
  32 #include "kdc/kdc.h"
  33 #include "param/param.h"
  34
  35 NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
  36                                        struct smb_iconv_convenience *ic,
  37                                        struct auth_serversupplied_info *info,
  38                                        DATA_BLOB *pac_data)
  39 {
  40         struct netr_SamInfo3 *info3;
  41         union PAC_INFO pac_info;
  42         enum ndr_err_code ndr_err;
  43         NTSTATUS nt_status;
  44
  45         ZERO_STRUCT(pac_info);
  46
  47         nt_status = auth_convert_server_info_saminfo3(mem_ctx, info, &info3);
  48         if (!NT_STATUS_IS_OK(nt_status)) {
  49                 DEBUG(1, ("Getting Samba info failed: %s\n",
  50                           nt_errstr(nt_status)));
  51                 return nt_status;
  52         }
  53
  54         pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  55         if (!mem_ctx) {
  56                 return NT_STATUS_NO_MEMORY;
  57         }
  58
  59         pac_info.logon_info.info->info3 = *info3;
  60
  61         ndr_err = ndr_push_union_blob(pac_data, mem_ctx, ic, &pac_info,
  62                                       PAC_TYPE_LOGON_INFO,
  63                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  64         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  65                 nt_status = ndr_map_error2ntstatus(ndr_err);
  66                 DEBUG(1, ("PAC (presig) push failed: %s\n",
  67                           nt_errstr(nt_status)));
  68                 return nt_status;
  69         }
  70
  71         return NT_STATUS_OK;
  72 }
  73
  74 krb5_error_code samba_make_krb5_pac(krb5_context context,
  75                                     DATA_BLOB *pac_blob,
  76                                     krb5_pac *pac)
  77 {
  78         krb5_data pac_data;
  79         krb5_error_code ret;
  80
  81         ret = krb5_data_copy(&pac_data, pac_blob->data, pac_blob->length);
  82         if (ret != 0) {
  83                 return ret;
  84         }
  85
  86         ret = krb5_pac_init(context, pac);
  87         if (ret != 0) {
  88                 krb5_data_free(&pac_data);
  89                 return ret;
  90         }
  91
  92         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
  93         krb5_data_free(&pac_data);
  94         if (ret != 0) {
  95                 return ret;
  96         }
  97
  98         return ret;
  99 }
 100
 101 bool samba_princ_needs_pac(struct hdb_entry_ex *princ)
 102 {
 103
 104         struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
 105         unsigned int userAccountControl;
 106
 107
 108         /* The service account may be set not to want the PAC */
 109         userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
 110         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 111                 return false;
 112         }
 113
 114         return true;
 115 }
 116
 117 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 118                                 struct hdb_entry_ex *client,
 119                                 DATA_BLOB **_pac_blob)
 120 {
 121         struct samba_kdc_entry *p = talloc_get_type(client->ctx, struct samba_kdc_entry);
 122         struct auth_serversupplied_info *server_info;
 123         DATA_BLOB *pac_blob;
 124         NTSTATUS nt_status;
 125
 126         /* The user account may be set not to want the PAC */
 127         if ( ! samba_princ_needs_pac(client)) {
 128                 *_pac_blob = NULL;
 129                 return NT_STATUS_OK;
 130         }
 131
 132         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
 133         if (!pac_blob) {
 134                 return NT_STATUS_NO_MEMORY;
 135         }
 136
 137         nt_status = authsam_make_server_info(mem_ctx, p->kdc_db_ctx->samdb,
 138                                              lp_netbios_name(p->kdc_db_ctx->lp_ctx),
 139                                              lp_sam_name(p->kdc_db_ctx->lp_ctx),
 140                                              p->realm_dn,
 141                                              p->msg,
 142                                              data_blob(NULL, 0),
 143                                              data_blob(NULL, 0),
 144                                              &server_info);
 145         if (!NT_STATUS_IS_OK(nt_status)) {
 146                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 147                           nt_errstr(nt_status)));
 148                 return nt_status;
 149         }
 150
 151         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 152                                                   p->kdc_db_ctx->ic_ctx,
 153                                                   server_info, pac_blob);
 154         if (!NT_STATUS_IS_OK(nt_status)) {
 155                 DEBUG(0, ("Building PAC failed: %s\n",
 156                           nt_errstr(nt_status)));
 157                 return nt_status;
 158         }
 159
 160         *_pac_blob = pac_blob;
 161         return NT_STATUS_OK;
 162 }
 163
 164 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 165                                    krb5_context context,
 166                                    struct smb_iconv_convenience *ic,
 167                                    krb5_pac *pac, DATA_BLOB *pac_blob)
 168 {
 169         struct auth_serversupplied_info *server_info;
 170         krb5_error_code ret;
 171         NTSTATUS nt_status;
 172
 173         ret = kerberos_pac_to_server_info(mem_ctx, ic, *pac,
 174                                           context, &server_info);
 175         if (ret) {
 176                 return NT_STATUS_UNSUCCESSFUL;
 177         }
 178
 179         nt_status = samba_get_logon_info_pac_blob(mem_ctx, ic,
 180                                                   server_info, pac_blob);
 181
 182         return nt_status;
 183 }
 184
 185 /* this function allocates 'data' using malloc.
 186  * The caller is responsible for freeing it */
 187 void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
 188 {
 189         PA_DATA pa;
 190         unsigned char *buf;
 191         size_t len;
 192         krb5_error_code ret = 0;
 193
 194         if (!e_data)
 195                 return;
 196
 197         pa.padata_type          = KRB5_PADATA_PW_SALT;
 198         pa.padata_value.length  = 12;
 199         pa.padata_value.data    = malloc(pa.padata_value.length);
 200         if (!pa.padata_value.data) {
 201                 e_data->length = 0;
 202                 e_data->data = NULL;
 203                 return;
 204         }
 205
 206         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 207         SIVAL(pa.padata_value.data, 4, 0);
 208         SIVAL(pa.padata_value.data, 8, 1);
 209
 210         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 211         free(pa.padata_value.data);
 212
 213         e_data->data   = buf;
 214         e_data->length = len;
 215
 216         return;
 217 }
 218
 219 /* function to map policy errors */
 220 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 221 {
 222         krb5_error_code ret;
 223
 224         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 225                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 226         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 227                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 228         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 229                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 230         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 231                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 232         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 233                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 234         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 235                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 236         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 237                 ret = KRB5KDC_ERR_POLICY;
 238         else
 239                 ret = KRB5KDC_ERR_POLICY;
 240
 241         return ret;
 242 }
 243
 244 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 245  * for consistency */
 246 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 247                                        const char *client_name,
 248                                        const char *workstation,
 249                                        bool password_change)
 250 {
 251         TALLOC_CTX *tmp_ctx;
 252         NTSTATUS nt_status;
 253
 254         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 255         if (!tmp_ctx) {
 256                 return NT_STATUS_NO_MEMORY;
 257         }
 258
 259         /* we allow all kinds of trusts here */
 260         nt_status = authsam_account_ok(tmp_ctx,
 261                                        kdc_entry->kdc_db_ctx->samdb,
 262                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 263                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 264                                        kdc_entry->realm_dn, kdc_entry->msg,
 265                                        workstation, client_name,
 266                                        true, password_change);
 267
 268         talloc_free(tmp_ctx);
 269         return nt_status;
 270 }
 271