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 static
  36 NTSTATUS samba_get_logon_info_pac_blob(TALLOC_CTX *mem_ctx,
  37                                        struct smb_iconv_convenience *ic,
  38                                        struct auth_serversupplied_info *info,
  39                                        DATA_BLOB *pac_data)
  40 {
  41         struct netr_SamInfo3 *info3;
  42         union PAC_INFO pac_info;
  43         enum ndr_err_code ndr_err;
  44         NTSTATUS nt_status;
  45
  46         ZERO_STRUCT(pac_info);
  47
  48         nt_status = auth_convert_server_info_saminfo3(mem_ctx, info, &info3);
  49         if (!NT_STATUS_IS_OK(nt_status)) {
  50                 DEBUG(1, ("Getting Samba info failed: %s\n",
  51                           nt_errstr(nt_status)));
  52                 return nt_status;
  53         }
  54
  55         pac_info.logon_info.info = talloc_zero(mem_ctx, struct PAC_LOGON_INFO);
  56         if (!mem_ctx) {
  57                 return NT_STATUS_NO_MEMORY;
  58         }
  59
  60         pac_info.logon_info.info->info3 = *info3;
  61
  62         ndr_err = ndr_push_union_blob(pac_data, mem_ctx, ic, &pac_info,
  63                                       PAC_TYPE_LOGON_INFO,
  64                                       (ndr_push_flags_fn_t)ndr_push_PAC_INFO);
  65         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  66                 nt_status = ndr_map_error2ntstatus(ndr_err);
  67                 DEBUG(1, ("PAC (presig) push failed: %s\n",
  68                           nt_errstr(nt_status)));
  69                 return nt_status;
  70         }
  71
  72         return NT_STATUS_OK;
  73 }
  74
  75 krb5_error_code samba_make_krb5_pac(krb5_context context,
  76                                     DATA_BLOB *pac_blob,
  77                                     krb5_pac *pac)
  78 {
  79         krb5_data pac_data;
  80         krb5_error_code ret;
  81
  82         /* The user account may be set not to want the PAC */
  83         if (!pac_blob) {
  84                 return 0;
  85         }
  86
  87         ret = krb5_data_copy(&pac_data, pac_blob->data, pac_blob->length);
  88         if (ret != 0) {
  89                 return ret;
  90         }
  91
  92         ret = krb5_pac_init(context, pac);
  93         if (ret != 0) {
  94                 krb5_data_free(&pac_data);
  95                 return ret;
  96         }
  97
  98         ret = krb5_pac_add_buffer(context, *pac, PAC_TYPE_LOGON_INFO, &pac_data);
  99         krb5_data_free(&pac_data);
 100         if (ret != 0) {
 101                 return ret;
 102         }
 103
 104         return ret;
 105 }
 106
 107 bool samba_princ_needs_pac(struct hdb_entry_ex *princ)
 108 {
 109
 110         struct samba_kdc_entry *p = talloc_get_type(princ->ctx, struct samba_kdc_entry);
 111         unsigned int userAccountControl;
 112
 113
 114         /* The service account may be set not to want the PAC */
 115         userAccountControl = ldb_msg_find_attr_as_uint(p->msg, "userAccountControl", 0);
 116         if (userAccountControl & UF_NO_AUTH_DATA_REQUIRED) {
 117                 return false;
 118         }
 119
 120         return true;
 121 }
 122
 123 NTSTATUS samba_kdc_get_pac_blob(TALLOC_CTX *mem_ctx,
 124                                 struct hdb_entry_ex *client,
 125                                 DATA_BLOB **_pac_blob)
 126 {
 127         struct samba_kdc_entry *p = talloc_get_type(client->ctx, struct samba_kdc_entry);
 128         struct auth_serversupplied_info *server_info;
 129         DATA_BLOB *pac_blob;
 130         NTSTATUS nt_status;
 131
 132         /* The user account may be set not to want the PAC */
 133         if ( ! samba_princ_needs_pac(client)) {
 134                 *_pac_blob = NULL;
 135                 return NT_STATUS_OK;
 136         }
 137
 138         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
 139         if (!pac_blob) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         nt_status = authsam_make_server_info(mem_ctx, p->kdc_db_ctx->samdb,
 144                                              lp_netbios_name(p->kdc_db_ctx->lp_ctx),
 145                                              lp_sam_name(p->kdc_db_ctx->lp_ctx),
 146                                              p->realm_dn,
 147                                              p->msg,
 148                                              data_blob(NULL, 0),
 149                                              data_blob(NULL, 0),
 150                                              &server_info);
 151         if (!NT_STATUS_IS_OK(nt_status)) {
 152                 DEBUG(0, ("Getting user info for PAC failed: %s\n",
 153                           nt_errstr(nt_status)));
 154                 return nt_status;
 155         }
 156
 157         nt_status = samba_get_logon_info_pac_blob(mem_ctx,
 158                                                   p->kdc_db_ctx->ic_ctx,
 159                                                   server_info, pac_blob);
 160         if (!NT_STATUS_IS_OK(nt_status)) {
 161                 DEBUG(0, ("Building PAC failed: %s\n",
 162                           nt_errstr(nt_status)));
 163                 return nt_status;
 164         }
 165
 166         *_pac_blob = pac_blob;
 167         return NT_STATUS_OK;
 168 }
 169
 170 NTSTATUS samba_kdc_update_pac_blob(TALLOC_CTX *mem_ctx,
 171                                    krb5_context context,
 172                                    struct smb_iconv_convenience *ic,
 173                                    krb5_pac *pac, DATA_BLOB *pac_blob)
 174 {
 175         struct auth_serversupplied_info *server_info;
 176         krb5_error_code ret;
 177         NTSTATUS nt_status;
 178
 179         ret = kerberos_pac_to_server_info(mem_ctx, ic, *pac,
 180                                           context, &server_info);
 181         if (ret) {
 182                 return NT_STATUS_UNSUCCESSFUL;
 183         }
 184
 185         nt_status = samba_get_logon_info_pac_blob(mem_ctx, ic,
 186                                                   server_info, pac_blob);
 187
 188         return nt_status;
 189 }
 190
 191 /* this function allocates 'data' using malloc.
 192  * The caller is responsible for freeing it */
 193 void samba_kdc_build_edata_reply(NTSTATUS nt_status, DATA_BLOB *e_data)
 194 {
 195         PA_DATA pa;
 196         unsigned char *buf;
 197         size_t len;
 198         krb5_error_code ret = 0;
 199
 200         if (!e_data)
 201                 return;
 202
 203         pa.padata_type          = KRB5_PADATA_PW_SALT;
 204         pa.padata_value.length  = 12;
 205         pa.padata_value.data    = malloc(pa.padata_value.length);
 206         if (!pa.padata_value.data) {
 207                 e_data->length = 0;
 208                 e_data->data = NULL;
 209                 return;
 210         }
 211
 212         SIVAL(pa.padata_value.data, 0, NT_STATUS_V(nt_status));
 213         SIVAL(pa.padata_value.data, 4, 0);
 214         SIVAL(pa.padata_value.data, 8, 1);
 215
 216         ASN1_MALLOC_ENCODE(PA_DATA, buf, len, &pa, &len, ret);
 217         free(pa.padata_value.data);
 218
 219         e_data->data   = buf;
 220         e_data->length = len;
 221
 222         return;
 223 }
 224
 225 /* function to map policy errors */
 226 krb5_error_code samba_kdc_map_policy_err(NTSTATUS nt_status)
 227 {
 228         krb5_error_code ret;
 229
 230         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 231                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 232         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 233                 ret = KRB5KDC_ERR_KEY_EXPIRED;
 234         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 235                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 236         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 237                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 238         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 239                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 240         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 241                 ret = KRB5KDC_ERR_CLIENT_REVOKED;
 242         else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 243                 ret = KRB5KDC_ERR_POLICY;
 244         else
 245                 ret = KRB5KDC_ERR_POLICY;
 246
 247         return ret;
 248 }
 249
 250 /* Given a kdc entry, consult the account_ok routine in auth/auth_sam.c
 251  * for consistency */
 252 NTSTATUS samba_kdc_check_client_access(struct samba_kdc_entry *kdc_entry,
 253                                        const char *client_name,
 254                                        const char *workstation,
 255                                        bool password_change)
 256 {
 257         TALLOC_CTX *tmp_ctx;
 258         NTSTATUS nt_status;
 259
 260         tmp_ctx = talloc_named(NULL, 0, "samba_kdc_check_client_access");
 261         if (!tmp_ctx) {
 262                 return NT_STATUS_NO_MEMORY;
 263         }
 264
 265         /* we allow all kinds of trusts here */
 266         nt_status = authsam_account_ok(tmp_ctx,
 267                                        kdc_entry->kdc_db_ctx->samdb,
 268                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 269                                        MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 270                                        kdc_entry->realm_dn, kdc_entry->msg,
 271                                        workstation, client_name,
 272                                        true, password_change);
 273
 274         talloc_free(tmp_ctx);
 275         return nt_status;
 276 }
 277