source4/kdc/wdc-samba4.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 "auth/auth.h"
  27 #include "kdc/kdc.h"
  28 #include "param/param.h"
  29 #include "kdc/pac-glue.h"
  30
  31 /* Given the right private pointer from hdb_samba4, get a PAC from the attached ldb messages */
  32 static krb5_error_code samba_wdc_get_pac(void *priv, krb5_context context,
  33                                          struct hdb_entry_ex *client,
  34                                          krb5_pac *pac)
  35 {
  36         TALLOC_CTX *mem_ctx;
  37         DATA_BLOB *pac_blob;
  38         krb5_error_code ret;
  39         NTSTATUS nt_status;
  40
  41         mem_ctx = talloc_named(client->ctx, 0, "samba_get_pac context");
  42         if (!mem_ctx) {
  43                 return ENOMEM;
  44         }
  45
  46         nt_status = samba_kdc_get_pac_blob(mem_ctx, client, &pac_blob);
  47         if (!NT_STATUS_IS_OK(nt_status)) {
  48                 talloc_free(mem_ctx);
  49                 return EINVAL;
  50         }
  51
  52         ret = samba_make_krb5_pac(context, pac_blob, pac);
  53
  54         talloc_free(mem_ctx);
  55         return ret;
  56 }
  57
  58 /* Resign (and reform, including possibly new groups) a PAC */
  59
  60 static krb5_error_code samba_wdc_reget_pac(void *priv, krb5_context context,
  61                                            const krb5_principal client_principal,
  62                                            struct hdb_entry_ex *client,
  63                                            struct hdb_entry_ex *server, krb5_pac *pac)
  64 {
  65         struct samba_kdc_entry *p = talloc_get_type(server->ctx, struct samba_kdc_entry);
  66         TALLOC_CTX *mem_ctx = talloc_named(p, 0, "samba_kdc_reget_pac context");
  67         DATA_BLOB *pac_blob;
  68         krb5_error_code ret;
  69         NTSTATUS nt_status;
  70
  71         if (!mem_ctx) {
  72                 return ENOMEM;
  73         }
  74
  75         pac_blob = talloc_zero(mem_ctx, DATA_BLOB);
  76         if (!pac_blob) {
  77                 talloc_free(mem_ctx);
  78                 return ENOMEM;
  79         }
  80
  81         /* The user account may be set not to want the PAC */
  82         if (!samba_princ_needs_pac(server)) {
  83                 talloc_free(mem_ctx);
  84                 return EINVAL;
  85         }
  86
  87         nt_status = samba_kdc_update_pac_blob(mem_ctx, context,
  88                                               p->kdc_db_ctx->ic_ctx,
  89                                               pac, pac_blob);
  90         if (!NT_STATUS_IS_OK(nt_status)) {
  91                 DEBUG(0, ("Building PAC failed: %s\n",
  92                           nt_errstr(nt_status)));
  93                 talloc_free(mem_ctx);
  94                 return EINVAL;
  95         }
  96
  97         /* We now completly regenerate this pac */
  98         krb5_pac_free(context, *pac);
  99
 100         ret = samba_make_krb5_pac(context, pac_blob, pac);
 101
 102         talloc_free(mem_ctx);
 103         return ret;
 104 }
 105
 106 /* Given an hdb entry (and in particular it's private member), consult
 107  * the account_ok routine in auth/auth_sam.c for consistancy */
 108 static krb5_error_code samba_wdc_check_client_access(void *priv,
 109                                                      krb5_context context,
 110                                                      krb5_kdc_configuration *config,
 111                                                      hdb_entry_ex *client_ex, const char *client_name,
 112                                                      hdb_entry_ex *server_ex, const char *server_name,
 113                                                      KDC_REQ *req,
 114                                                      krb5_data *e_data)
 115 {
 116         krb5_error_code ret;
 117         NTSTATUS nt_status;
 118         TALLOC_CTX *tmp_ctx;
 119         struct samba_kdc_entry *p;
 120         char *workstation = NULL;
 121         HostAddresses *addresses = req->req_body.addresses;
 122         int i;
 123         bool password_change;
 124
 125         tmp_ctx = talloc_new(client_ex->ctx);
 126         p = talloc_get_type(client_ex->ctx, struct samba_kdc_entry);
 127
 128         if (!tmp_ctx) {
 129                 return ENOMEM;
 130         }
 131
 132         if (addresses) {
 133                 for (i=0; i < addresses->len; i++) {
 134                         if (addresses->val->addr_type == KRB5_ADDRESS_NETBIOS) {
 135                                 workstation = talloc_strndup(tmp_ctx, addresses->val->address.data, MIN(addresses->val->address.length, 15));
 136                                 if (workstation) {
 137                                         break;
 138                                 }
 139                         }
 140                 }
 141         }
 142
 143         /* Strip space padding */
 144         if (workstation) {
 145                 i = MIN(strlen(workstation), 15);
 146                 for (; i > 0 && workstation[i - 1] == ' '; i--) {
 147                         workstation[i - 1] = '\0';
 148                 }
 149         }
 150
 151         password_change = (server_ex && server_ex->entry.flags.change_pw);
 152
 153         /* we allow all kinds of trusts here */
 154         nt_status = authsam_account_ok(tmp_ctx,
 155                                        p->kdc_db_ctx->samdb,
 156                                        MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 157                                        p->realm_dn,
 158                                        p->msg,
 159                                        workstation,
 160                                        client_name, true, password_change);
 161
 162         if (NT_STATUS_IS_OK(nt_status)) {
 163                 /* Now do the standard Heimdal check */
 164                 ret = kdc_check_flags(context, config,
 165                                       client_ex, client_name,
 166                                       server_ex, server_name,
 167                                       req->msg_type == krb_as_req);
 168         } else {
 169                 if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_MUST_CHANGE))
 170                         ret = KRB5KDC_ERR_KEY_EXPIRED;
 171                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_PASSWORD_EXPIRED))
 172                         ret = KRB5KDC_ERR_KEY_EXPIRED;
 173                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_EXPIRED))
 174                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
 175                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_DISABLED))
 176                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
 177                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_LOGON_HOURS))
 178                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
 179                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCOUNT_LOCKED_OUT))
 180                         ret = KRB5KDC_ERR_CLIENT_REVOKED;
 181                 else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_WORKSTATION))
 182                         ret = KRB5KDC_ERR_POLICY;
 183                 else
 184                         ret = KRB5KDC_ERR_POLICY;
 185
 186                 samba_kdc_build_edata_reply(tmp_ctx, e_data, nt_status);
 187         }
 188
 189         return ret;
 190 }
 191
 192 static krb5_error_code samba_wdc_plugin_init(krb5_context context, void **ptr)
 193 {
 194         *ptr = NULL;
 195         return 0;
 196 }
 197
 198 static void samba_wdc_plugin_fini(void *ptr)
 199 {
 200         return;
 201 }
 202
 203 struct krb5plugin_windc_ftable windc_plugin_table = {
 204         .minor_version = KRB5_WINDC_PLUGING_MINOR,
 205         .init = samba_wdc_plugin_init,
 206         .fini = samba_wdc_plugin_fini,
 207         .pac_generate = samba_wdc_get_pac,
 208         .pac_verify = samba_wdc_reget_pac,
 209         .client_access = samba_wdc_check_client_access,
 210 };
 211
 212