source4/kdc/kdc-service-mit.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Start MIT krb5kdc server within Samba AD
   5
   6    Copyright (c) 2014-2016 Andreas Schneider <asn@samba.org>
   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    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "talloc.h"
  24 #include "tevent.h"
  25 #include "system/filesys.h"
  26 #include "lib/param/param.h"
  27 #include "lib/util/samba_util.h"
  28 #include "source4/smbd/service.h"
  29 #include "source4/smbd/process_model.h"
  30 #include "kdc/kdc-service-mit.h"
  31 #include "dynconfig.h"
  32 #include "libds/common/roles.h"
  33 #include "lib/socket/netif.h"
  34 #include "samba/session.h"
  35 #include "dsdb/samdb/samdb.h"
  36 #include "kdc/samba_kdc.h"
  37 #include "kdc/kdc-server.h"
  38 #include "kdc/kpasswd-service.h"
  39 #include <kadm5/admin.h>
  40 #include <kdb.h>
  41
  42 #include "source4/kdc/mit_kdc_irpc.h"
  43
  44 /* PROTOTYPES */
  45 static void mitkdc_server_done(struct tevent_req *subreq);
  46
  47 static int kdc_server_destroy(struct kdc_server *kdc)
  48 {
  49         if (kdc->private_data != NULL) {
  50                 kadm5_destroy(kdc->private_data);
  51         }
  52
  53         return 0;
  54 }
  55
  56 static NTSTATUS startup_kpasswd_server(TALLOC_CTX *mem_ctx,
  57                                        struct kdc_server *kdc,
  58                                        struct loadparm_context *lp_ctx,
  59                                        struct interface *ifaces)
  60 {
  61         int num_interfaces;
  62         int i;
  63         TALLOC_CTX *tmp_ctx;
  64         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  65         uint16_t kpasswd_port;
  66         bool done_wildcard = false;
  67         bool ok;
  68
  69         kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
  70         if (kpasswd_port == 0) {
  71                 return NT_STATUS_OK;
  72         }
  73
  74         tmp_ctx = talloc_named_const(mem_ctx, 0, "kpasswd");
  75         if (tmp_ctx == NULL) {
  76                 return NT_STATUS_NO_MEMORY;
  77         }
  78
  79         num_interfaces = iface_list_count(ifaces);
  80
  81         ok = lpcfg_bind_interfaces_only(lp_ctx);
  82         if (!ok) {
  83                 int num_binds = 0;
  84                 char **wcard;
  85
  86                 wcard = iface_list_wildcard(tmp_ctx);
  87                 if (wcard == NULL) {
  88                         status = NT_STATUS_NO_MEMORY;
  89                         goto out;
  90                 }
  91
  92                 for (i = 0; wcard[i] != NULL; i++) {
  93                         status = kdc_add_socket(kdc,
  94                                                 kdc->task->model_ops,
  95                                                 "kpasswd",
  96                                                 wcard[i],
  97                                                 kpasswd_port,
  98                                                 kpasswd_process,
  99                                                 false);
 100                         if (NT_STATUS_IS_OK(status)) {
 101                                 num_binds++;
 102                         }
 103                 }
 104                 talloc_free(wcard);
 105
 106                 if (num_binds == 0) {
 107                         status = NT_STATUS_INVALID_PARAMETER_MIX;
 108                         goto out;
 109                 }
 110
 111                 done_wildcard = true;
 112         }
 113
 114         for (i = 0; i < num_interfaces; i++) {
 115                 const char *address = talloc_strdup(tmp_ctx, iface_list_n_ip(ifaces, i));
 116
 117                 status = kdc_add_socket(kdc,
 118                                         kdc->task->model_ops,
 119                                         "kpasswd",
 120                                         address,
 121                                         kpasswd_port,
 122                                         kpasswd_process,
 123                                         done_wildcard);
 124                 if (NT_STATUS_IS_OK(status)) {
 125                         goto out;
 126                 }
 127         }
 128
 129 out:
 130         talloc_free(tmp_ctx);
 131         return status;
 132 }
 133
 134 /*
 135  * Startup a copy of the krb5kdc as a child daemon
 136  */
 137 void mitkdc_task_init(struct task_server *task)
 138 {
 139         struct tevent_req *subreq;
 140         const char * const *kdc_cmd;
 141         struct interface *ifaces;
 142         char *kdc_config = NULL;
 143         struct kdc_server *kdc;
 144         krb5_error_code code;
 145         NTSTATUS status;
 146         kadm5_ret_t ret;
 147         kadm5_config_params config;
 148         void *server_handle;
 149
 150         task_server_set_title(task, "task[mitkdc_parent]");
 151
 152         switch (lpcfg_server_role(task->lp_ctx)) {
 153         case ROLE_STANDALONE:
 154                 task_server_terminate(task,
 155                                       "The KDC is not required in standalone "
 156                                       "server configuration, terminate!",
 157                                       false);
 158                 return;
 159         case ROLE_DOMAIN_MEMBER:
 160                 task_server_terminate(task,
 161                                       "The KDC is not required in member "
 162                                       "server configuration",
 163                                       false);
 164                 return;
 165         case ROLE_ACTIVE_DIRECTORY_DC:
 166                 /* Yes, we want to start the KDC */
 167                 break;
 168         }
 169
 170         /* Load interfaces for kpasswd */
 171         load_interface_list(task, task->lp_ctx, &ifaces);
 172         if (iface_list_count(ifaces) == 0) {
 173                 task_server_terminate(task,
 174                                       "KDC: no network interfaces configured",
 175                                       false);
 176                 return;
 177         }
 178
 179         kdc_config = talloc_asprintf(task,
 180                                      "%s/kdc.conf",
 181                                      lpcfg_private_dir(task->lp_ctx));
 182         if (kdc_config == NULL) {
 183                 task_server_terminate(task,
 184                                       "KDC: no memory",
 185                                       false);
 186                 return;
 187         }
 188         setenv("KRB5_KDC_PROFILE", kdc_config, 0);
 189         TALLOC_FREE(kdc_config);
 190
 191         /* start it as a child process */
 192         kdc_cmd = lpcfg_mit_kdc_command(task->lp_ctx);
 193
 194         subreq = samba_runcmd_send(task,
 195                                    task->event_ctx,
 196                                    timeval_zero(),
 197                                    1, /* stdout log level */
 198                                    0, /* stderr log level */
 199                                    kdc_cmd,
 200                                    "-n", /* Don't go into background */
 201 #if 0
 202                                    "-w 2", /* Start two workers */
 203 #endif
 204                                    NULL);
 205         if (subreq == NULL) {
 206                 DEBUG(0, ("Failed to start MIT KDC as child daemon\n"));
 207
 208                 task_server_terminate(task,
 209                                       "Failed to startup mitkdc task",
 210                                       true);
 211                 return;
 212         }
 213
 214         tevent_req_set_callback(subreq, mitkdc_server_done, task);
 215
 216         DEBUG(5,("Started krb5kdc process\n"));
 217
 218         status = samba_setup_mit_kdc_irpc(task);
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 task_server_terminate(task,
 221                                       "Failed to setup kdc irpc service",
 222                                       true);
 223         }
 224
 225         DEBUG(5,("Started irpc service for kdc_server\n"));
 226
 227         kdc = talloc_zero(task, struct kdc_server);
 228         if (kdc == NULL) {
 229                 task_server_terminate(task, "KDC: Out of memory", true);
 230                 return;
 231         }
 232         talloc_set_destructor(kdc, kdc_server_destroy);
 233
 234         kdc->task = task;
 235
 236         kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
 237         if (kdc->base_ctx == NULL) {
 238                 task_server_terminate(task, "KDC: Out of memory", true);
 239                 return;
 240         }
 241
 242         kdc->base_ctx->ev_ctx = task->event_ctx;
 243         kdc->base_ctx->lp_ctx = task->lp_ctx;
 244
 245         initialize_krb5_error_table();
 246
 247         code = smb_krb5_init_context(kdc,
 248                                      kdc->task->lp_ctx,
 249                                      &kdc->smb_krb5_context);
 250         if (code != 0) {
 251                 task_server_terminate(task,
 252                                       "KDC: Unable to initialized krb5 context",
 253                                       true);
 254                 return;
 255         }
 256
 257         code = kadm5_init_krb5_context(&kdc->smb_krb5_context->krb5_context);
 258         if (code != 0) {
 259                 task_server_terminate(task,
 260                                       "KDC: Unable to init kadm5 krb5_context",
 261                                       true);
 262                 return;
 263         }
 264
 265         ZERO_STRUCT(config);
 266         config.mask = KADM5_CONFIG_REALM;
 267         config.realm = discard_const_p(char, lpcfg_realm(kdc->task->lp_ctx));
 268
 269         ret = kadm5_init(kdc->smb_krb5_context->krb5_context,
 270                          discard_const_p(char, "kpasswd"),
 271                          NULL, /* pass */
 272                          discard_const_p(char, "kpasswd"),
 273                          &config,
 274                          KADM5_STRUCT_VERSION,
 275                          KADM5_API_VERSION_4,
 276                          NULL,
 277                          &server_handle);
 278         if (ret != 0) {
 279                 task_server_terminate(task,
 280                                       "KDC: Initialize kadm5",
 281                                       true);
 282                 return;
 283         }
 284         kdc->private_data = server_handle;
 285
 286         code = krb5_db_register_keytab(kdc->smb_krb5_context->krb5_context);
 287         if (code != 0) {
 288                 task_server_terminate(task,
 289                                       "KDC: Unable to KDB",
 290                                       true);
 291                 return;
 292         }
 293
 294         kdc->keytab_name = talloc_asprintf(kdc, "KDB:");
 295         if (kdc->keytab_name == NULL) {
 296                 task_server_terminate(task,
 297                                       "KDC: Out of memory",
 298                                       true);
 299                 return;
 300         }
 301
 302         kdc->samdb = samdb_connect(kdc,
 303                                    kdc->task->event_ctx,
 304                                    kdc->task->lp_ctx,
 305                                    system_session(kdc->task->lp_ctx),
 306                                    NULL,
 307                                    0);
 308         if (kdc->samdb == NULL) {
 309                 task_server_terminate(task,
 310                                       "KDC: Unable to connect to sambdb",
 311                                       true);
 312                 return;
 313         }
 314
 315         status = startup_kpasswd_server(kdc,
 316                                     kdc,
 317                                     task->lp_ctx,
 318                                     ifaces);
 319         if (!NT_STATUS_IS_OK(status)) {
 320                 task_server_terminate(task,
 321                                       "KDC: Unable to start kpasswd server",
 322                                       true);
 323         }
 324
 325         DEBUG(5,("Started kpasswd service for kdc_server\n"));
 326 }
 327
 328 /*
 329  * This gets called the kdc exits.
 330  */
 331 static void mitkdc_server_done(struct tevent_req *subreq)
 332 {
 333         struct task_server *task =
 334                 tevent_req_callback_data(subreq,
 335                 struct task_server);
 336         int sys_errno;
 337         int ret;
 338
 339         ret = samba_runcmd_recv(subreq, &sys_errno);
 340         if (ret != 0) {
 341                 DEBUG(0, ("The MIT KDC daemon died with exit status %d\n",
 342                           sys_errno));
 343         } else {
 344                 DEBUG(0,("The MIT KDC daemon exited normally\n"));
 345         }
 346
 347         task_server_terminate(task, "mitkdc child process exited", true);
 348 }
 349
 350 /* Called at MIT KRB5 startup - register ourselves as a server service */
 351 NTSTATUS server_service_mitkdc_init(TALLOC_CTX *mem_ctx);
 352
 353 NTSTATUS server_service_mitkdc_init(TALLOC_CTX *mem_ctx)
 354 {
 355         static const struct service_details details = {
 356                 .inhibit_fork_on_accept = true,
 357                 /*
 358                  * Need to prevent pre-forking on kdc.
 359                  * The task_init function is run on the master process only
 360                  * and the irpc process name is registered in it's event loop.
 361                  * The child worker processes initialise their event loops on
 362                  * fork, so are not listening for the irpc event.
 363                  *
 364                  * The master process does not wait on that event context
 365                  * the master process is responsible for managing the worker
 366                  * processes not performing work.
 367                  */
 368                 .inhibit_pre_fork = true
 369         };
 370         return register_server_service(mem_ctx, "kdc", mitkdc_task_init,
 371                                        &details);
 372 }