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/samba/service.h"
  29 #include "source4/samba/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 #undef DBGC_CLASS
  45 #define DBGC_CLASS DBGC_KERBEROS
  46
  47 /* PROTOTYPES */
  48 static void mitkdc_server_done(struct tevent_req *subreq);
  49
  50 static int kdc_server_destroy(struct kdc_server *kdc)
  51 {
  52         if (kdc->private_data != NULL) {
  53                 kadm5_destroy(kdc->private_data);
  54         }
  55
  56         return 0;
  57 }
  58
  59 static NTSTATUS startup_kpasswd_server(TALLOC_CTX *mem_ctx,
  60                                        struct kdc_server *kdc,
  61                                        struct loadparm_context *lp_ctx,
  62                                        struct interface *ifaces)
  63 {
  64         int num_interfaces;
  65         int i;
  66         TALLOC_CTX *tmp_ctx;
  67         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
  68         uint16_t kpasswd_port;
  69         bool done_wildcard = false;
  70         bool ok;
  71
  72         kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
  73         if (kpasswd_port == 0) {
  74                 return NT_STATUS_OK;
  75         }
  76
  77         tmp_ctx = talloc_named_const(mem_ctx, 0, "kpasswd");
  78         if (tmp_ctx == NULL) {
  79                 return NT_STATUS_NO_MEMORY;
  80         }
  81
  82         num_interfaces = iface_list_count(ifaces);
  83
  84         ok = lpcfg_bind_interfaces_only(lp_ctx);
  85         if (!ok) {
  86                 int num_binds = 0;
  87                 char **wcard;
  88
  89                 wcard = iface_list_wildcard(tmp_ctx);
  90                 if (wcard == NULL) {
  91                         status = NT_STATUS_NO_MEMORY;
  92                         goto out;
  93                 }
  94
  95                 for (i = 0; wcard[i] != NULL; i++) {
  96                         status = kdc_add_socket(kdc,
  97                                                 kdc->task->model_ops,
  98                                                 "kpasswd",
  99                                                 wcard[i],
 100                                                 kpasswd_port,
 101                                                 kpasswd_process,
 102                                                 false);
 103                         if (NT_STATUS_IS_OK(status)) {
 104                                 num_binds++;
 105                         }
 106                 }
 107                 talloc_free(wcard);
 108
 109                 if (num_binds == 0) {
 110                         status = NT_STATUS_INVALID_PARAMETER_MIX;
 111                         goto out;
 112                 }
 113
 114                 done_wildcard = true;
 115         }
 116
 117         for (i = 0; i < num_interfaces; i++) {
 118                 const char *address = talloc_strdup(tmp_ctx, iface_list_n_ip(ifaces, i));
 119
 120                 status = kdc_add_socket(kdc,
 121                                         kdc->task->model_ops,
 122                                         "kpasswd",
 123                                         address,
 124                                         kpasswd_port,
 125                                         kpasswd_process,
 126                                         done_wildcard);
 127                 if (NT_STATUS_IS_OK(status)) {
 128                         goto out;
 129                 }
 130         }
 131
 132 out:
 133         talloc_free(tmp_ctx);
 134         return status;
 135 }
 136
 137 /*
 138  * Startup a copy of the krb5kdc as a child daemon
 139  */
 140 NTSTATUS mitkdc_task_init(struct task_server *task)
 141 {
 142         struct tevent_req *subreq;
 143         const char * const *kdc_cmd;
 144         struct interface *ifaces;
 145         char *kdc_config = NULL;
 146         struct kdc_server *kdc;
 147         krb5_error_code code;
 148         NTSTATUS status;
 149         kadm5_ret_t ret;
 150         kadm5_config_params config;
 151         void *server_handle;
 152         int dbglvl = 0;
 153
 154         task_server_set_title(task, "task[mitkdc_parent]");
 155
 156         switch (lpcfg_server_role(task->lp_ctx)) {
 157         case ROLE_STANDALONE:
 158                 task_server_terminate(task,
 159                                       "The KDC is not required in standalone "
 160                                       "server configuration, terminate!",
 161                                       false);
 162                 return NT_STATUS_INVALID_DOMAIN_ROLE;
 163         case ROLE_DOMAIN_MEMBER:
 164                 task_server_terminate(task,
 165                                       "The KDC is not required in member "
 166                                       "server configuration",
 167                                       false);
 168                 return NT_STATUS_INVALID_DOMAIN_ROLE;
 169         case ROLE_ACTIVE_DIRECTORY_DC:
 170                 /* Yes, we want to start the KDC */
 171                 break;
 172         }
 173
 174         /* Load interfaces for kpasswd */
 175         load_interface_list(task, task->lp_ctx, &ifaces);
 176         if (iface_list_count(ifaces) == 0) {
 177                 task_server_terminate(task,
 178                                       "KDC: no network interfaces configured",
 179                                       false);
 180                 return NT_STATUS_UNSUCCESSFUL;
 181         }
 182
 183         kdc_config = talloc_asprintf(task,
 184                                      "%s/kdc.conf",
 185                                      lpcfg_private_dir(task->lp_ctx));
 186         if (kdc_config == NULL) {
 187                 task_server_terminate(task,
 188                                       "KDC: no memory",
 189                                       false);
 190                 return NT_STATUS_NO_MEMORY;
 191         }
 192         setenv("KRB5_KDC_PROFILE", kdc_config, 0);
 193         TALLOC_FREE(kdc_config);
 194
 195         dbglvl = debuglevel_get_class(DBGC_KERBEROS);
 196         if (dbglvl >= 10) {
 197                 char *kdc_trace_file = talloc_asprintf(task,
 198                                                        "%s/mit_kdc_trace.log",
 199                                                        get_dyn_LOGFILEBASE());
 200                 if (kdc_trace_file == NULL) {
 201                         task_server_terminate(task,
 202                                         "KDC: no memory",
 203                                         false);
 204                         return NT_STATUS_NO_MEMORY;
 205                 }
 206
 207                 setenv("KRB5_TRACE", kdc_trace_file, 1);
 208         }
 209
 210         /* start it as a child process */
 211         kdc_cmd = lpcfg_mit_kdc_command(task->lp_ctx);
 212
 213         subreq = samba_runcmd_send(task,
 214                                    task->event_ctx,
 215                                    timeval_zero(),
 216                                    1, /* stdout log level */
 217                                    0, /* stderr log level */
 218                                    kdc_cmd,
 219                                    "-n", /* Don't go into background */
 220 #if 0
 221                                    "-w 2", /* Start two workers */
 222 #endif
 223                                    NULL);
 224         if (subreq == NULL) {
 225                 DEBUG(0, ("Failed to start MIT KDC as child daemon\n"));
 226
 227                 task_server_terminate(task,
 228                                       "Failed to startup mitkdc task",
 229                                       true);
 230                 return NT_STATUS_INTERNAL_ERROR;
 231         }
 232
 233         tevent_req_set_callback(subreq, mitkdc_server_done, task);
 234
 235         DEBUG(5,("Started krb5kdc process\n"));
 236
 237         status = samba_setup_mit_kdc_irpc(task);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 task_server_terminate(task,
 240                                       "Failed to setup kdc irpc service",
 241                                       true);
 242         }
 243
 244         DEBUG(5,("Started irpc service for kdc_server\n"));
 245
 246         kdc = talloc_zero(task, struct kdc_server);
 247         if (kdc == NULL) {
 248                 task_server_terminate(task, "KDC: Out of memory", true);
 249                 return NT_STATUS_NO_MEMORY;
 250         }
 251         talloc_set_destructor(kdc, kdc_server_destroy);
 252
 253         kdc->task = task;
 254
 255         kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
 256         if (kdc->base_ctx == NULL) {
 257                 task_server_terminate(task, "KDC: Out of memory", true);
 258                 return NT_STATUS_NO_MEMORY;
 259         }
 260
 261         kdc->base_ctx->ev_ctx = task->event_ctx;
 262         kdc->base_ctx->lp_ctx = task->lp_ctx;
 263
 264         initialize_krb5_error_table();
 265
 266         code = smb_krb5_init_context(kdc,
 267                                      kdc->task->lp_ctx,
 268                                      &kdc->smb_krb5_context);
 269         if (code != 0) {
 270                 task_server_terminate(task,
 271                                       "KDC: Unable to initialize krb5 context",
 272                                       true);
 273                 return NT_STATUS_INTERNAL_ERROR;
 274         }
 275
 276         code = kadm5_init_krb5_context(&kdc->smb_krb5_context->krb5_context);
 277         if (code != 0) {
 278                 task_server_terminate(task,
 279                                       "KDC: Unable to init kadm5 krb5_context",
 280                                       true);
 281                 return NT_STATUS_INTERNAL_ERROR;
 282         }
 283
 284         ZERO_STRUCT(config);
 285         config.mask = KADM5_CONFIG_REALM;
 286         config.realm = discard_const_p(char, lpcfg_realm(kdc->task->lp_ctx));
 287
 288         ret = kadm5_init(kdc->smb_krb5_context->krb5_context,
 289                          discard_const_p(char, "kpasswd"),
 290                          NULL, /* pass */
 291                          discard_const_p(char, "kpasswd"),
 292                          &config,
 293                          KADM5_STRUCT_VERSION,
 294                          KADM5_API_VERSION_4,
 295                          NULL,
 296                          &server_handle);
 297         if (ret != 0) {
 298                 task_server_terminate(task,
 299                                       "KDC: Initialize kadm5",
 300                                       true);
 301                 return NT_STATUS_INTERNAL_ERROR;
 302         }
 303         kdc->private_data = server_handle;
 304
 305         code = krb5_db_register_keytab(kdc->smb_krb5_context->krb5_context);
 306         if (code != 0) {
 307                 task_server_terminate(task,
 308                                       "KDC: Unable to KDB",
 309                                       true);
 310                 return NT_STATUS_INTERNAL_ERROR;
 311         }
 312
 313         kdc->kpasswd_keytab_name = talloc_asprintf(kdc, "KDB:");
 314         if (kdc->kpasswd_keytab_name == NULL) {
 315                 task_server_terminate(task,
 316                                       "KDC: Out of memory",
 317                                       true);
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320
 321         kdc->samdb = samdb_connect(kdc,
 322                                    kdc->task->event_ctx,
 323                                    kdc->task->lp_ctx,
 324                                    system_session(kdc->task->lp_ctx),
 325                                    NULL,
 326                                    0);
 327         if (kdc->samdb == NULL) {
 328                 task_server_terminate(task,
 329                                       "KDC: Unable to connect to samdb",
 330                                       true);
 331                 return NT_STATUS_CONNECTION_INVALID;
 332         }
 333
 334         status = startup_kpasswd_server(kdc,
 335                                     kdc,
 336                                     task->lp_ctx,
 337                                     ifaces);
 338         if (!NT_STATUS_IS_OK(status)) {
 339                 task_server_terminate(task,
 340                                       "KDC: Unable to start kpasswd server",
 341                                       true);
 342                 return status;
 343         }
 344
 345         DEBUG(5,("Started kpasswd service for kdc_server\n"));
 346
 347         return NT_STATUS_OK;
 348 }
 349
 350 /*
 351  * This gets called the kdc exits.
 352  */
 353 static void mitkdc_server_done(struct tevent_req *subreq)
 354 {
 355         struct task_server *task =
 356                 tevent_req_callback_data(subreq,
 357                 struct task_server);
 358         int sys_errno;
 359         int ret;
 360
 361         ret = samba_runcmd_recv(subreq, &sys_errno);
 362         if (ret != 0) {
 363                 DEBUG(0, ("The MIT KDC daemon died with exit status %d\n",
 364                           sys_errno));
 365         } else {
 366                 DEBUG(0,("The MIT KDC daemon exited normally\n"));
 367         }
 368
 369         task_server_terminate(task, "mitkdc child process exited", true);
 370 }
 371
 372 /* Called at MIT KRB5 startup - register ourselves as a server service */
 373 NTSTATUS server_service_mitkdc_init(TALLOC_CTX *mem_ctx);
 374
 375 NTSTATUS server_service_mitkdc_init(TALLOC_CTX *mem_ctx)
 376 {
 377         static const struct service_details details = {
 378                 .inhibit_fork_on_accept = true,
 379                 /*
 380                  * Need to prevent pre-forking on kdc.
 381                  * The task_init function is run on the master process only
 382                  * and the irpc process name is registered in it's event loop.
 383                  * The child worker processes initialise their event loops on
 384                  * fork, so are not listening for the irpc event.
 385                  *
 386                  * The master process does not wait on that event context
 387                  * the master process is responsible for managing the worker
 388                  * processes not performing work.
 389                  */
 390                 .inhibit_pre_fork = true,
 391                 .task_init = mitkdc_task_init,
 392                 .post_fork = NULL
 393         };
 394         return register_server_service(mem_ctx, "kdc", &details);
 395 }