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s4:dns_server: make use of gensec_update_ev()
[Samba.git] / source4 / dns_server / dlz_bind9.c
blobf5ceb6a581d9f1cb410fa1da8fe2e73fa3015938
1 /*
2 Unix SMB/CIFS implementation.
3
4 bind9 dlz driver for Samba
5
6 Copyright (C) 2010 Andrew Tridgell
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 "param/param.h"
25 #include "lib/events/events.h"
26 #include "dsdb/samdb/samdb.h"
27 #include "dsdb/common/util.h"
28 #include "auth/auth.h"
29 #include "auth/session.h"
30 #include "auth/gensec/gensec.h"
31 #include "librpc/gen_ndr/security.h"
32 #include "auth/credentials/credentials.h"
33 #include "system/kerberos.h"
34 #include "auth/kerberos/kerberos.h"
35 #include "gen_ndr/ndr_dnsp.h"
36 #include "gen_ndr/server_id.h"
37 #include "messaging/messaging.h"
38 #include "lib/cmdline/popt_common.h"
39 #include "lib/util/dlinklist.h"
40 #include "dlz_minimal.h"
41
42
43 struct b9_options {
44 const char *url;
45 const char *debug;
46 };
47
48 struct b9_zone {
49 char *name;
50 struct b9_zone *prev, *next;
51 };
52
53 struct dlz_bind9_data {
54 struct b9_options options;
55 struct ldb_context *samdb;
56 struct tevent_context *ev_ctx;
57 struct loadparm_context *lp;
58 int *transaction_token;
59 uint32_t soa_serial;
60 struct b9_zone *zonelist;
61
62 /* Used for dynamic update */
63 struct smb_krb5_context *smb_krb5_ctx;
64 struct auth4_context *auth_context;
65 struct auth_session_info *session_info;
66 char *update_name;
67
68 /* helper functions from the dlz_dlopen driver */
69 log_t *log;
70 dns_sdlz_putrr_t *putrr;
71 dns_sdlz_putnamedrr_t *putnamedrr;
72 dns_dlz_writeablezone_t *writeable_zone;
73 };
74
75 static struct dlz_bind9_data *dlz_bind9_state = NULL;
76 static int dlz_bind9_state_ref_count = 0;
77
78 static const char *zone_prefixes[] = {
79 "CN=MicrosoftDNS,DC=DomainDnsZones",
80 "CN=MicrosoftDNS,DC=ForestDnsZones",
81 "CN=MicrosoftDNS,CN=System",
82 NULL
83 };
84
85 /*
86 return the version of the API
87 */
88 _PUBLIC_ int dlz_version(unsigned int *flags)
89 {
90 return DLZ_DLOPEN_VERSION;
91 }
92
93 /*
94 remember a helper function from the bind9 dlz_dlopen driver
95 */
96 static void b9_add_helper(struct dlz_bind9_data *state, const char *helper_name, void *ptr)
97 {
98 if (strcmp(helper_name, "log") == 0) {
99 state->log = ptr;
100 }
101 if (strcmp(helper_name, "putrr") == 0) {
102 state->putrr = ptr;
103 }
104 if (strcmp(helper_name, "putnamedrr") == 0) {
105 state->putnamedrr = ptr;
106 }
107 if (strcmp(helper_name, "writeable_zone") == 0) {
108 state->writeable_zone = ptr;
109 }
110 }
111
112 /*
113 format a record for bind9
114 */
115 static bool b9_format(struct dlz_bind9_data *state,
116 TALLOC_CTX *mem_ctx,
117 struct dnsp_DnssrvRpcRecord *rec,
118 const char **type, const char **data)
119 {
120 uint32_t i;
121 char *tmp;
122
123 switch (rec->wType) {
124 case DNS_TYPE_A:
125 *type = "a";
126 *data = rec->data.ipv4;
127 break;
128
129 case DNS_TYPE_AAAA:
130 *type = "aaaa";
131 *data = rec->data.ipv6;
132 break;
133
134 case DNS_TYPE_CNAME:
135 *type = "cname";
136 *data = rec->data.cname;
137 break;
138
139 case DNS_TYPE_TXT:
140 *type = "txt";
141 tmp = talloc_asprintf(mem_ctx, "\"%s\"", rec->data.txt.str[0]);
142 for (i=1; i<rec->data.txt.count; i++) {
143 tmp = talloc_asprintf_append(tmp, " \"%s\"", rec->data.txt.str[i]);
144 }
145 *data = tmp;
146 break;
147
148 case DNS_TYPE_PTR:
149 *type = "ptr";
150 *data = rec->data.ptr;
151 break;
152
153 case DNS_TYPE_SRV:
154 *type = "srv";
155 *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
156 rec->data.srv.wPriority,
157 rec->data.srv.wWeight,
158 rec->data.srv.wPort,
159 rec->data.srv.nameTarget);
160 break;
161
162 case DNS_TYPE_MX:
163 *type = "mx";
164 *data = talloc_asprintf(mem_ctx, "%u %s",
165 rec->data.mx.wPriority,
166 rec->data.mx.nameTarget);
167 break;
168
169 case DNS_TYPE_HINFO:
170 *type = "hinfo";
171 *data = talloc_asprintf(mem_ctx, "%s %s",
172 rec->data.hinfo.cpu,
173 rec->data.hinfo.os);
174 break;
175
176 case DNS_TYPE_NS:
177 *type = "ns";
178 *data = rec->data.ns;
179 break;
180
181 case DNS_TYPE_SOA: {
182 const char *mname;
183 *type = "soa";
184
185 /* we need to fake the authoritative nameserver to
186 * point at ourselves. This is how AD DNS servers
187 * force clients to send updates to the right local DC
188 */
189 mname = talloc_asprintf(mem_ctx, "%s.%s",
190 lpcfg_netbios_name(state->lp), lpcfg_dnsdomain(state->lp));
191 if (mname == NULL) {
192 return false;
193 }
194 mname = strlower_talloc(mem_ctx, mname);
195 if (mname == NULL) {
196 return false;
197 }
198
199 state->soa_serial = rec->data.soa.serial;
200
201 *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
202 mname,
203 rec->data.soa.rname,
204 rec->data.soa.serial,
205 rec->data.soa.refresh,
206 rec->data.soa.retry,
207 rec->data.soa.expire,
208 rec->data.soa.minimum);
209 break;
210 }
211
212 default:
213 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
214 rec->wType);
215 return false;
216 }
217
218 return true;
219 }
220
221 static const struct {
222 enum dns_record_type dns_type;
223 const char *typestr;
224 bool single_valued;
225 } dns_typemap[] = {
226 { DNS_TYPE_A, "A" , false},
227 { DNS_TYPE_AAAA, "AAAA" , false},
228 { DNS_TYPE_CNAME, "CNAME" , true},
229 { DNS_TYPE_TXT, "TXT" , false},
230 { DNS_TYPE_PTR, "PTR" , false},
231 { DNS_TYPE_SRV, "SRV" , false},
232 { DNS_TYPE_MX, "MX" , false},
233 { DNS_TYPE_HINFO, "HINFO" , false},
234 { DNS_TYPE_NS, "NS" , false},
235 { DNS_TYPE_SOA, "SOA" , true},
236 };
237
238
239 /*
240 see if a DNS type is single valued
241 */
242 static bool b9_single_valued(enum dns_record_type dns_type)
243 {
244 int i;
245 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
246 if (dns_typemap[i].dns_type == dns_type) {
247 return dns_typemap[i].single_valued;
248 }
249 }
250 return false;
251 }
252
253 /*
254 see if a DNS type is single valued
255 */
256 static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
257 {
258 int i;
259 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
260 if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
261 *dtype = dns_typemap[i].dns_type;
262 return true;
263 }
264 }
265 return false;
266 }
267
268
269 #define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
270 (ret) = strtok_r(str, sep, &saveptr); \
271 if ((ret) == NULL) return false; \
272 } while (0)
273
274 #define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
275 char *istr = strtok_r(str, sep, &saveptr); \
276 if ((istr) == NULL) return false; \
277 (ret) = strtoul(istr, NULL, 10); \
278 } while (0)
279
280 /*
281 parse a record from bind9
282 */
283 static bool b9_parse(struct dlz_bind9_data *state,
284 const char *rdatastr,
285 struct dnsp_DnssrvRpcRecord *rec)
286 {
287 char *full_name, *dclass, *type;
288 char *str, *tmp, *saveptr=NULL;
289 int i;
290
291 str = talloc_strdup(rec, rdatastr);
292 if (str == NULL) {
293 return false;
294 }
295
296 /* parse the SDLZ string form */
297 DNS_PARSE_STR(full_name, str, "\t", saveptr);
298 DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
299 DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
300 DNS_PARSE_STR(type, NULL, "\t", saveptr);
301
302 /* construct the record */
303 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
304 if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
305 rec->wType = dns_typemap[i].dns_type;
306 break;
307 }
308 }
309 if (i == ARRAY_SIZE(dns_typemap)) {
310 state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
311 type, full_name);
312 return false;
313 }
314
315 switch (rec->wType) {
316 case DNS_TYPE_A:
317 DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
318 break;
319
320 case DNS_TYPE_AAAA:
321 DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
322 break;
323
324 case DNS_TYPE_CNAME:
325 DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
326 break;
327
328 case DNS_TYPE_TXT:
329 rec->data.txt.count = 0;
330 rec->data.txt.str = talloc_array(rec, const char *, rec->data.txt.count);
331 tmp = strtok_r(NULL, "\t", &saveptr);
332 while (tmp) {
333 rec->data.txt.str = talloc_realloc(rec, rec->data.txt.str, const char *,
334 rec->data.txt.count+1);
335 if (tmp[0] == '"') {
336 /* Strip quotes */
337 rec->data.txt.str[rec->data.txt.count] = talloc_strndup(rec, &tmp[1], strlen(tmp)-2);
338 } else {
339 rec->data.txt.str[rec->data.txt.count] = talloc_strdup(rec, tmp);
340 }
341 rec->data.txt.count++;
342 tmp = strtok_r(NULL, " ", &saveptr);
343 }
344 break;
345
346 case DNS_TYPE_PTR:
347 DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
348 break;
349
350 case DNS_TYPE_SRV:
351 DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
352 DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
353 DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
354 DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
355 break;
356
357 case DNS_TYPE_MX:
358 DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
359 DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
360 break;
361
362 case DNS_TYPE_HINFO:
363 DNS_PARSE_STR(rec->data.hinfo.cpu, NULL, " ", saveptr);
364 DNS_PARSE_STR(rec->data.hinfo.os, NULL, " ", saveptr);
365 break;
366
367 case DNS_TYPE_NS:
368 DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
369 break;
370
371 case DNS_TYPE_SOA:
372 DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
373 DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
374 DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
375 DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
376 DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
377 DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
378 DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
379 break;
380
381 default:
382 state->log(ISC_LOG_ERROR, "samba b9_parse: unhandled record type %u",
383 rec->wType);
384 return false;
385 }
386
387 /* we should be at the end of the buffer now */
388 if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
389 state->log(ISC_LOG_ERROR, "samba b9_parse: unexpected data at end of string for '%s'",
390 rdatastr);
391 return false;
392 }
393
394 return true;
395 }
396
397 /*
398 send a resource record to bind9
399 */
400 static isc_result_t b9_putrr(struct dlz_bind9_data *state,
401 void *handle, struct dnsp_DnssrvRpcRecord *rec,
402 const char **types)
403 {
404 isc_result_t result;
405 const char *type, *data;
406 TALLOC_CTX *tmp_ctx = talloc_new(state);
407
408 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
409 return ISC_R_FAILURE;
410 }
411
412 if (data == NULL) {
413 talloc_free(tmp_ctx);
414 return ISC_R_NOMEMORY;
415 }
416
417 if (types) {
418 int i;
419 for (i=0; types[i]; i++) {
420 if (strcmp(types[i], type) == 0) break;
421 }
422 if (types[i] == NULL) {
423 /* skip it */
424 return ISC_R_SUCCESS;
425 }
426 }
427
428 result = state->putrr(handle, type, rec->dwTtlSeconds, data);
429 if (result != ISC_R_SUCCESS) {
430 state->log(ISC_LOG_ERROR, "Failed to put rr");
431 }
432 talloc_free(tmp_ctx);
433 return result;
434 }
435
436
437 /*
438 send a named resource record to bind9
439 */
440 static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
441 void *handle, const char *name,
442 struct dnsp_DnssrvRpcRecord *rec)
443 {
444 isc_result_t result;
445 const char *type, *data;
446 TALLOC_CTX *tmp_ctx = talloc_new(state);
447
448 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
449 return ISC_R_FAILURE;
450 }
451
452 if (data == NULL) {
453 talloc_free(tmp_ctx);
454 return ISC_R_NOMEMORY;
455 }
456
457 result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
458 if (result != ISC_R_SUCCESS) {
459 state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
460 }
461 talloc_free(tmp_ctx);
462 return result;
463 }
464
465 /*
466 parse options
467 */
468 static isc_result_t parse_options(struct dlz_bind9_data *state,
469 unsigned int argc, char *argv[],
470 struct b9_options *options)
471 {
472 int opt;
473 poptContext pc;
474 struct poptOption long_options[] = {
475 { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
476 { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
477 { NULL }
478 };
479
480 pc = poptGetContext("dlz_bind9", argc, (const char **)argv, long_options,
481 POPT_CONTEXT_KEEP_FIRST);
482 while ((opt = poptGetNextOpt(pc)) != -1) {
483 switch (opt) {
484 default:
485 state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
486 poptBadOption(pc, 0), poptStrerror(opt));
487 return ISC_R_FAILURE;
488 }
489 }
490
491 return ISC_R_SUCCESS;
492 }
493
494
495 /*
496 * Create session info from PAC
497 * This is called as auth_context->generate_session_info_pac()
498 */
499 static NTSTATUS b9_generate_session_info_pac(struct auth4_context *auth_context,
500 TALLOC_CTX *mem_ctx,
501 struct smb_krb5_context *smb_krb5_context,
502 DATA_BLOB *pac_blob,
503 const char *principal_name,
504 const struct tsocket_address *remote_addr,
505 uint32_t session_info_flags,
506 struct auth_session_info **session_info)
507 {
508 NTSTATUS status;
509 struct auth_user_info_dc *user_info_dc;
510 TALLOC_CTX *tmp_ctx;
511
512 tmp_ctx = talloc_new(mem_ctx);
513 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
514
515 status = kerberos_pac_blob_to_user_info_dc(tmp_ctx,
516 *pac_blob,
517 smb_krb5_context->krb5_context,
518 &user_info_dc,
519 NULL,
520 NULL);
521 if (!NT_STATUS_IS_OK(status)) {
522 talloc_free(tmp_ctx);
523 return status;
524 }
525
526 if (user_info_dc->info->authenticated) {
527 session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
528 }
529
530 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
531
532 status = auth_generate_session_info(mem_ctx, NULL, NULL, user_info_dc,
533 session_info_flags, session_info);
534 if (!NT_STATUS_IS_OK(status)) {
535 talloc_free(tmp_ctx);
536 return status;
537 }
538
539 talloc_free(tmp_ctx);
540 return status;
541 }
542
543 /* Callback for the DEBUG() system, to catch the remaining messages */
544 static void b9_debug(void *private_ptr, int msg_level, const char *msg)
545 {
546 static const int isc_log_map[] = {
547 ISC_LOG_CRITICAL, /* 0 */
548 ISC_LOG_ERROR, /* 1 */
549 ISC_LOG_WARNING, /* 2 */
550 ISC_LOG_NOTICE /* 3 */
551 };
552 struct dlz_bind9_data *state = private_ptr;
553 int isc_log_level;
554
555 if (msg_level >= ARRAY_SIZE(isc_log_map) || msg_level < 0) {
556 isc_log_level = ISC_LOG_INFO;
557 } else {
558 isc_log_level = isc_log_map[msg_level];
559 }
560 state->log(isc_log_level, "samba_dlz: %s", msg);
561 }
562
563 static int dlz_state_debug_unregister(struct dlz_bind9_data *state)
564 {
565 /* Stop logging (to the bind9 logs) */
566 debug_set_callback(NULL, NULL);
567 return 0;
568 }
569
570 /*
571 called to initialise the driver
572 */
573 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
574 unsigned int argc, char *argv[],
575 void **dbdata, ...)
576 {
577 struct dlz_bind9_data *state;
578 const char *helper_name;
579 va_list ap;
580 isc_result_t result;
581 struct ldb_dn *dn;
582 NTSTATUS nt_status;
583
584 if (dlz_bind9_state != NULL) {
585 *dbdata = dlz_bind9_state;
586 dlz_bind9_state_ref_count++;
587 return ISC_R_SUCCESS;
588 }
589
590 state = talloc_zero(NULL, struct dlz_bind9_data);
591 if (state == NULL) {
592 return ISC_R_NOMEMORY;
593 }
594
595 talloc_set_destructor(state, dlz_state_debug_unregister);
596
597 /* fill in the helper functions */
598 va_start(ap, dbdata);
599 while ((helper_name = va_arg(ap, const char *)) != NULL) {
600 b9_add_helper(state, helper_name, va_arg(ap, void*));
601 }
602 va_end(ap);
603
604 /* Do not install samba signal handlers */
605 fault_setup_disable();
606
607 /* Start logging (to the bind9 logs) */
608 debug_set_callback(state, b9_debug);
609
610 state->ev_ctx = s4_event_context_init(state);
611 if (state->ev_ctx == NULL) {
612 result = ISC_R_NOMEMORY;
613 goto failed;
614 }
615
616 result = parse_options(state, argc, argv, &state->options);
617 if (result != ISC_R_SUCCESS) {
618 goto failed;
619 }
620
621 state->lp = loadparm_init_global(true);
622 if (state->lp == NULL) {
623 result = ISC_R_NOMEMORY;
624 goto failed;
625 }
626
627 if (state->options.debug) {
628 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
629 } else {
630 lpcfg_do_global_parameter(state->lp, "log level", "0");
631 }
632
633 if (smb_krb5_init_context(state, state->ev_ctx, state->lp, &state->smb_krb5_ctx) != 0) {
634 result = ISC_R_NOMEMORY;
635 goto failed;
636 }
637
638 nt_status = gensec_init();
639 if (!NT_STATUS_IS_OK(nt_status)) {
640 result = ISC_R_NOMEMORY;
641 goto failed;
642 }
643
644 state->auth_context = talloc_zero(state, struct auth4_context);
645 if (state->auth_context == NULL) {
646 result = ISC_R_NOMEMORY;
647 goto failed;
648 }
649
650 if (state->options.url == NULL) {
651 state->options.url = lpcfg_private_path(state, state->lp, "dns/sam.ldb");
652 if (state->options.url == NULL) {
653 result = ISC_R_NOMEMORY;
654 goto failed;
655 }
656 }
657
658 state->samdb = samdb_connect_url(state, state->ev_ctx, state->lp,
659 system_session(state->lp), 0, state->options.url);
660 if (state->samdb == NULL) {
661 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to connect to %s",
662 state->options.url);
663 result = ISC_R_FAILURE;
664 goto failed;
665 }
666
667 dn = ldb_get_default_basedn(state->samdb);
668 if (dn == NULL) {
669 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
670 state->options.url, ldb_errstring(state->samdb));
671 result = ISC_R_FAILURE;
672 goto failed;
673 }
674
675 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
676 ldb_dn_get_linearized(dn));
677
678 state->auth_context->event_ctx = state->ev_ctx;
679 state->auth_context->lp_ctx = state->lp;
680 state->auth_context->sam_ctx = state->samdb;
681 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
682
683 *dbdata = state;
684 dlz_bind9_state = state;
685 dlz_bind9_state_ref_count++;
686
687 return ISC_R_SUCCESS;
688
689 failed:
690 talloc_free(state);
691 return result;
692 }
693
694 /*
695 shutdown the backend
696 */
697 _PUBLIC_ void dlz_destroy(void *dbdata)
698 {
699 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
700 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
701
702 dlz_bind9_state_ref_count--;
703 if (dlz_bind9_state_ref_count == 0) {
704 talloc_unlink(state, state->samdb);
705 talloc_free(state);
706 dlz_bind9_state = NULL;
707 }
708 }
709
710
711 /*
712 return the base DN for a zone
713 */
714 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
715 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
716 {
717 int ret;
718 TALLOC_CTX *tmp_ctx = talloc_new(state);
719 const char *attrs[] = { NULL };
720 int i;
721
722 for (i=0; zone_prefixes[i]; i++) {
723 struct ldb_dn *dn;
724 struct ldb_result *res;
725
726 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
727 if (dn == NULL) {
728 talloc_free(tmp_ctx);
729 return ISC_R_NOMEMORY;
730 }
731
732 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
733 talloc_free(tmp_ctx);
734 return ISC_R_NOMEMORY;
735 }
736
737 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
738 if (ret == LDB_SUCCESS) {
739 if (zone_dn != NULL) {
740 *zone_dn = talloc_steal(mem_ctx, dn);
741 }
742 talloc_free(tmp_ctx);
743 return ISC_R_SUCCESS;
744 }
745 talloc_free(dn);
746 }
747
748 talloc_free(tmp_ctx);
749 return ISC_R_NOTFOUND;
750 }
751
752
753 /*
754 return the DN for a name. The record does not need to exist, but the
755 zone must exist
756 */
757 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
758 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
759 {
760 const char *p;
761
762 /* work through the name piece by piece, until we find a zone */
763 for (p=name; p; ) {
764 isc_result_t result;
765 result = b9_find_zone_dn(state, p, mem_ctx, dn);
766 if (result == ISC_R_SUCCESS) {
767 /* we found a zone, now extend the DN to get
768 * the full DN
769 */
770 bool ret;
771 if (p == name) {
772 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
773 } else {
774 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
775 }
776 if (!ret) {
777 talloc_free(*dn);
778 return ISC_R_NOMEMORY;
779 }
780 return ISC_R_SUCCESS;
781 }
782 p = strchr(p, '.');
783 if (p == NULL) {
784 break;
785 }
786 p++;
787 }
788 return ISC_R_NOTFOUND;
789 }
790
791
792 /*
793 see if we handle a given zone
794 */
795 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
796 {
797 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
798 return b9_find_zone_dn(state, name, NULL, NULL);
799 }
800
801
802 /*
803 lookup one record
804 */
805 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
806 const char *zone, const char *name,
807 dns_sdlzlookup_t *lookup,
808 const char **types)
809 {
810 TALLOC_CTX *tmp_ctx = talloc_new(state);
811 const char *attrs[] = { "dnsRecord", NULL };
812 int ret = LDB_SUCCESS, i;
813 struct ldb_result *res;
814 struct ldb_message_element *el;
815 struct ldb_dn *dn;
816
817 for (i=0; zone_prefixes[i]; i++) {
818 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
819 if (dn == NULL) {
820 talloc_free(tmp_ctx);
821 return ISC_R_NOMEMORY;
822 }
823
824 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
825 talloc_free(tmp_ctx);
826 return ISC_R_NOMEMORY;
827 }
828
829 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
830 attrs, "objectClass=dnsNode");
831 if (ret == LDB_SUCCESS) {
832 break;
833 }
834 }
835 if (ret != LDB_SUCCESS || res->count == 0) {
836 talloc_free(tmp_ctx);
837 return ISC_R_NOTFOUND;
838 }
839
840 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
841 if (el == NULL || el->num_values == 0) {
842 talloc_free(tmp_ctx);
843 return ISC_R_NOTFOUND;
844 }
845
846 for (i=0; i<el->num_values; i++) {
847 struct dnsp_DnssrvRpcRecord rec;
848 enum ndr_err_code ndr_err;
849 isc_result_t result;
850
851 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
852 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
853 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
854 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
855 ldb_dn_get_linearized(dn));
856 talloc_free(tmp_ctx);
857 return ISC_R_FAILURE;
858 }
859
860 result = b9_putrr(state, lookup, &rec, types);
861 if (result != ISC_R_SUCCESS) {
862 talloc_free(tmp_ctx);
863 return result;
864 }
865 }
866
867 talloc_free(tmp_ctx);
868 return ISC_R_SUCCESS;
869 }
870
871 /*
872 lookup one record
873 */
874 #ifdef BIND_VERSION_9_8
875 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
876 void *dbdata, dns_sdlzlookup_t *lookup)
877 #else
878 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
879 void *dbdata, dns_sdlzlookup_t *lookup,
880 dns_clientinfomethods_t *methods,
881 dns_clientinfo_t *clientinfo)
882 #endif
883 {
884 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
885 return dlz_lookup_types(state, zone, name, lookup, NULL);
886 }
887
888
889 /*
890 see if a zone transfer is allowed
891 */
892 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
893 {
894 /* just say yes for all our zones for now */
895 return dlz_findzonedb(dbdata, name);
896 }
897
898 /*
899 perform a zone transfer
900 */
901 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
902 dns_sdlzallnodes_t *allnodes)
903 {
904 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
905 const char *attrs[] = { "dnsRecord", NULL };
906 int ret = LDB_SUCCESS, i, j;
907 struct ldb_dn *dn;
908 struct ldb_result *res;
909 TALLOC_CTX *tmp_ctx = talloc_new(state);
910
911 for (i=0; zone_prefixes[i]; i++) {
912 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
913 if (dn == NULL) {
914 talloc_free(tmp_ctx);
915 return ISC_R_NOMEMORY;
916 }
917
918 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
919 talloc_free(tmp_ctx);
920 return ISC_R_NOMEMORY;
921 }
922
923 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
924 attrs, "objectClass=dnsNode");
925 if (ret == LDB_SUCCESS) {
926 break;
927 }
928 }
929 if (ret != LDB_SUCCESS) {
930 talloc_free(tmp_ctx);
931 return ISC_R_NOTFOUND;
932 }
933
934 for (i=0; i<res->count; i++) {
935 struct ldb_message_element *el;
936 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
937 const char *rdn, *name;
938 const struct ldb_val *v;
939
940 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
941 if (el == NULL || el->num_values == 0) {
942 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
943 ldb_dn_get_linearized(dn));
944 talloc_free(el_ctx);
945 continue;
946 }
947
948 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
949 if (v == NULL) {
950 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
951 ldb_dn_get_linearized(dn));
952 talloc_free(el_ctx);
953 continue;
954 }
955
956 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
957 if (rdn == NULL) {
958 talloc_free(tmp_ctx);
959 return ISC_R_NOMEMORY;
960 }
961
962 if (strcmp(rdn, "@") == 0) {
963 name = zone;
964 } else {
965 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
966 }
967 if (name == NULL) {
968 talloc_free(tmp_ctx);
969 return ISC_R_NOMEMORY;
970 }
971
972 for (j=0; j<el->num_values; j++) {
973 struct dnsp_DnssrvRpcRecord rec;
974 enum ndr_err_code ndr_err;
975 isc_result_t result;
976
977 ndr_err = ndr_pull_struct_blob(&el->values[j], el_ctx, &rec,
978 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
979 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
980 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
981 ldb_dn_get_linearized(dn));
982 continue;
983 }
984
985 result = b9_putnamedrr(state, allnodes, name, &rec);
986 if (result != ISC_R_SUCCESS) {
987 continue;
988 }
989 }
990 }
991
992 talloc_free(tmp_ctx);
993
994 return ISC_R_SUCCESS;
995 }
996
997
998 /*
999 start a transaction
1000 */
1001 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
1002 {
1003 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1004
1005 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
1006
1007 if (state->transaction_token != NULL) {
1008 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
1009 return ISC_R_FAILURE;
1010 }
1011
1012 state->transaction_token = talloc_zero(state, int);
1013 if (state->transaction_token == NULL) {
1014 return ISC_R_NOMEMORY;
1015 }
1016
1017 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
1018 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
1019 talloc_free(state->transaction_token);
1020 state->transaction_token = NULL;
1021 return ISC_R_FAILURE;
1022 }
1023
1024 *versionp = (void *)state->transaction_token;
1025
1026 return ISC_R_SUCCESS;
1027 }
1028
1029 /*
1030 end a transaction
1031 */
1032 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1033 void *dbdata, void **versionp)
1034 {
1035 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1036
1037 if (state->transaction_token != (int *)*versionp) {
1038 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1039 return;
1040 }
1041
1042 if (commit) {
1043 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1044 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1045 return;
1046 }
1047 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1048 } else {
1049 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1050 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1051 return;
1052 }
1053 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1054 }
1055
1056 talloc_free(state->transaction_token);
1057 state->transaction_token = NULL;
1058 *versionp = NULL;
1059 }
1060
1061
1062 /*
1063 see if there is a SOA record for a zone
1064 */
1065 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1066 {
1067 const char *attrs[] = { "dnsRecord", NULL };
1068 struct ldb_result *res;
1069 struct ldb_message_element *el;
1070 TALLOC_CTX *tmp_ctx = talloc_new(state);
1071 int ret, i;
1072
1073 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
1074 talloc_free(tmp_ctx);
1075 return false;
1076 }
1077
1078 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1079 attrs, "objectClass=dnsNode");
1080 if (ret != LDB_SUCCESS) {
1081 talloc_free(tmp_ctx);
1082 return false;
1083 }
1084
1085 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1086 if (el == NULL) {
1087 talloc_free(tmp_ctx);
1088 return false;
1089 }
1090 for (i=0; i<el->num_values; i++) {
1091 struct dnsp_DnssrvRpcRecord rec;
1092 enum ndr_err_code ndr_err;
1093
1094 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
1095 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1096 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1097 continue;
1098 }
1099 if (rec.wType == DNS_TYPE_SOA) {
1100 talloc_free(tmp_ctx);
1101 return true;
1102 }
1103 }
1104
1105 talloc_free(tmp_ctx);
1106 return false;
1107 }
1108
1109 static bool b9_zone_add(struct dlz_bind9_data *state, const char *name)
1110 {
1111 struct b9_zone *zone;
1112
1113 zone = talloc_zero(state, struct b9_zone);
1114 if (zone == NULL) {
1115 return false;
1116 }
1117
1118 zone->name = talloc_strdup(zone, name);
1119 if (zone->name == NULL) {
1120 talloc_free(zone);
1121 return false;
1122 }
1123
1124 DLIST_ADD(state->zonelist, zone);
1125 return true;
1126 }
1127
1128 static bool b9_zone_exists(struct dlz_bind9_data *state, const char *name)
1129 {
1130 struct b9_zone *zone = state->zonelist;
1131 bool found = false;
1132
1133 while (zone != NULL) {
1134 if (strcasecmp(name, zone->name) == 0) {
1135 found = true;
1136 break;
1137 }
1138 zone = zone->next;
1139 }
1140
1141 return found;
1142 }
1143
1144
1145 /*
1146 configure a writeable zone
1147 */
1148 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1149 {
1150 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1151 TALLOC_CTX *tmp_ctx;
1152 struct ldb_dn *dn;
1153 int i;
1154
1155 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1156 if (state->writeable_zone == NULL) {
1157 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1158 return ISC_R_FAILURE;
1159 }
1160
1161 tmp_ctx = talloc_new(state);
1162
1163 for (i=0; zone_prefixes[i]; i++) {
1164 const char *attrs[] = { "name", NULL };
1165 int j, ret;
1166 struct ldb_result *res;
1167
1168 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1169 if (dn == NULL) {
1170 talloc_free(tmp_ctx);
1171 return ISC_R_NOMEMORY;
1172 }
1173
1174 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1175 talloc_free(tmp_ctx);
1176 return ISC_R_NOMEMORY;
1177 }
1178
1179 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1180 attrs, "objectClass=dnsZone");
1181 if (ret != LDB_SUCCESS) {
1182 continue;
1183 }
1184
1185 for (j=0; j<res->count; j++) {
1186 isc_result_t result;
1187 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1188 struct ldb_dn *zone_dn;
1189
1190 if (zone == NULL) {
1191 continue;
1192 }
1193 /* Ignore zones that are not handled in BIND */
1194 if ((strcmp(zone, "RootDNSServers") == 0) ||
1195 (strcmp(zone, "..TrustAnchors") == 0)) {
1196 continue;
1197 }
1198 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1199 if (zone_dn == NULL) {
1200 talloc_free(tmp_ctx);
1201 return ISC_R_NOMEMORY;
1202 }
1203
1204 if (!b9_has_soa(state, zone_dn, zone)) {
1205 continue;
1206 }
1207
1208 if (b9_zone_exists(state, zone)) {
1209 state->log(ISC_LOG_WARNING, "samba_dlz: Ignoring duplicate zone '%s' from '%s'",
1210 zone, ldb_dn_get_linearized(zone_dn));
1211 continue;
1212 }
1213
1214 if (!b9_zone_add(state, zone)) {
1215 talloc_free(tmp_ctx);
1216 return ISC_R_NOMEMORY;
1217 }
1218
1219 result = state->writeable_zone(view, zone);
1220 if (result != ISC_R_SUCCESS) {
1221 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1222 zone);
1223 talloc_free(tmp_ctx);
1224 return result;
1225 }
1226 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1227 }
1228 }
1229
1230 talloc_free(tmp_ctx);
1231 return ISC_R_SUCCESS;
1232 }
1233
1234 /*
1235 authorize a zone update
1236 */
1237 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1238 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1239 void *dbdata)
1240 {
1241 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1242 TALLOC_CTX *tmp_ctx;
1243 DATA_BLOB ap_req;
1244 struct cli_credentials *server_credentials;
1245 char *keytab_name;
1246 int ret;
1247 int ldb_ret;
1248 NTSTATUS nt_status;
1249 struct gensec_security *gensec_ctx;
1250 struct auth_session_info *session_info;
1251 struct ldb_dn *dn;
1252 isc_result_t result;
1253 struct ldb_result *res;
1254 const char * attrs[] = { NULL };
1255 uint32_t access_mask;
1256
1257 /* Remove cached credentials, if any */
1258 if (state->session_info) {
1259 talloc_free(state->session_info);
1260 state->session_info = NULL;
1261 }
1262 if (state->update_name) {
1263 talloc_free(state->update_name);
1264 state->update_name = NULL;
1265 }
1266
1267 tmp_ctx = talloc_new(NULL);
1268 if (tmp_ctx == NULL) {
1269 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1270 return ISC_FALSE;
1271 }
1272
1273 ap_req = data_blob_const(keydata, keydatalen);
1274 server_credentials = cli_credentials_init(tmp_ctx);
1275 if (!server_credentials) {
1276 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1277 talloc_free(tmp_ctx);
1278 return ISC_FALSE;
1279 }
1280
1281 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1282 cli_credentials_set_conf(server_credentials, state->lp);
1283
1284 keytab_name = talloc_asprintf(tmp_ctx, "file:%s/dns.keytab",
1285 lpcfg_private_dir(state->lp));
1286 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1287 CRED_SPECIFIED);
1288 if (ret != 0) {
1289 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1290 keytab_name);
1291 talloc_free(tmp_ctx);
1292 return ISC_FALSE;
1293 }
1294 talloc_free(keytab_name);
1295
1296 nt_status = gensec_server_start(tmp_ctx,
1297 lpcfg_gensec_settings(tmp_ctx, state->lp),
1298 state->auth_context, &gensec_ctx);
1299 if (!NT_STATUS_IS_OK(nt_status)) {
1300 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1301 talloc_free(tmp_ctx);
1302 return ISC_FALSE;
1303 }
1304
1305 gensec_set_credentials(gensec_ctx, server_credentials);
1306
1307 nt_status = gensec_start_mech_by_name(gensec_ctx, "spnego");
1308 if (!NT_STATUS_IS_OK(nt_status)) {
1309 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1310 talloc_free(tmp_ctx);
1311 return ISC_FALSE;
1312 }
1313
1314 nt_status = gensec_update_ev(gensec_ctx, tmp_ctx, state->ev_ctx, ap_req, &ap_req);
1315 if (!NT_STATUS_IS_OK(nt_status)) {
1316 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1317 talloc_free(tmp_ctx);
1318 return ISC_FALSE;
1319 }
1320
1321 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1322 if (!NT_STATUS_IS_OK(nt_status)) {
1323 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1324 talloc_free(tmp_ctx);
1325 return ISC_FALSE;
1326 }
1327
1328 /* Get the DN from name */
1329 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1330 if (result != ISC_R_SUCCESS) {
1331 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1332 talloc_free(tmp_ctx);
1333 return ISC_FALSE;
1334 }
1335
1336 /* make sure the dn exists, or find parent dn in case new object is being added */
1337 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1338 attrs, "objectClass=dnsNode");
1339 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1340 ldb_dn_remove_child_components(dn, 1);
1341 access_mask = SEC_ADS_CREATE_CHILD;
1342 talloc_free(res);
1343 } else if (ldb_ret == LDB_SUCCESS) {
1344 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1345 talloc_free(res);
1346 } else {
1347 talloc_free(tmp_ctx);
1348 return ISC_FALSE;
1349 }
1350
1351 /* Do ACL check */
1352 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1353 session_info->security_token,
1354 access_mask, NULL);
1355 if (ldb_ret != LDB_SUCCESS) {
1356 state->log(ISC_LOG_INFO,
1357 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1358 signer, name, type, ldb_strerror(ldb_ret));
1359 talloc_free(tmp_ctx);
1360 return ISC_FALSE;
1361 }
1362
1363 /* Cache session_info, so it can be used in the actual add/delete operation */
1364 state->update_name = talloc_strdup(state, name);
1365 if (state->update_name == NULL) {
1366 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1367 talloc_free(tmp_ctx);
1368 return ISC_FALSE;
1369 }
1370 state->session_info = talloc_steal(state, session_info);
1371
1372 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1373 signer, name, tcpaddr, type, key);
1374
1375 talloc_free(tmp_ctx);
1376 return ISC_TRUE;
1377 }
1378
1379
1380 /*
1381 add a new record
1382 */
1383 static isc_result_t b9_add_record(struct dlz_bind9_data *state, const char *name,
1384 struct ldb_dn *dn,
1385 struct dnsp_DnssrvRpcRecord *rec)
1386 {
1387 struct ldb_message *msg;
1388 enum ndr_err_code ndr_err;
1389 struct ldb_val v;
1390 int ret;
1391
1392 msg = ldb_msg_new(rec);
1393 if (msg == NULL) {
1394 return ISC_R_NOMEMORY;
1395 }
1396 msg->dn = dn;
1397 ret = ldb_msg_add_string(msg, "objectClass", "dnsNode");
1398 if (ret != LDB_SUCCESS) {
1399 return ISC_R_FAILURE;
1400 }
1401
1402 ndr_err = ndr_push_struct_blob(&v, rec, rec, (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1403 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1404 return ISC_R_FAILURE;
1405 }
1406 ret = ldb_msg_add_value(msg, "dnsRecord", &v, NULL);
1407 if (ret != LDB_SUCCESS) {
1408 return ISC_R_FAILURE;
1409 }
1410
1411 ret = ldb_add(state->samdb, msg);
1412 if (ret != LDB_SUCCESS) {
1413 return ISC_R_FAILURE;
1414 }
1415
1416 return ISC_R_SUCCESS;
1417 }
1418
1419 /*
1420 see if two DNS names are the same
1421 */
1422 static bool dns_name_equal(const char *name1, const char *name2)
1423 {
1424 size_t len1 = strlen(name1);
1425 size_t len2 = strlen(name2);
1426 if (name1[len1-1] == '.') len1--;
1427 if (name2[len2-1] == '.') len2--;
1428 if (len1 != len2) {
1429 return false;
1430 }
1431 return strncasecmp_m(name1, name2, len1) == 0;
1432 }
1433
1434
1435 /*
1436 see if two dns records match
1437 */
1438 static bool b9_record_match(struct dlz_bind9_data *state,
1439 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1440 {
1441 bool status;
1442 int i;
1443
1444 if (rec1->wType != rec2->wType) {
1445 return false;
1446 }
1447 /* see if this type is single valued */
1448 if (b9_single_valued(rec1->wType)) {
1449 return true;
1450 }
1451
1452 /* see if the data matches */
1453 switch (rec1->wType) {
1454 case DNS_TYPE_A:
1455 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1456 case DNS_TYPE_AAAA:
1457 return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
1458 case DNS_TYPE_CNAME:
1459 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1460 case DNS_TYPE_TXT:
1461 status = (rec1->data.txt.count == rec2->data.txt.count);
1462 if (!status) return status;
1463 for (i=0; i<rec1->data.txt.count; i++) {
1464 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1465 }
1466 return status;
1467 case DNS_TYPE_PTR:
1468 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1469 case DNS_TYPE_NS:
1470 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1471
1472 case DNS_TYPE_SRV:
1473 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1474 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1475 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1476 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1477
1478 case DNS_TYPE_MX:
1479 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1480 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1481
1482 case DNS_TYPE_HINFO:
1483 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1484 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1485
1486 case DNS_TYPE_SOA:
1487 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1488 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1489 rec1->data.soa.serial == rec2->data.soa.serial &&
1490 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1491 rec1->data.soa.retry == rec2->data.soa.retry &&
1492 rec1->data.soa.expire == rec2->data.soa.expire &&
1493 rec1->data.soa.minimum == rec2->data.soa.minimum;
1494 default:
1495 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
1496 rec1->wType);
1497 break;
1498 }
1499
1500 return false;
1501 }
1502
1503 /*
1504 * Update session_info on samdb using the cached credentials
1505 */
1506 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1507 {
1508 int ret;
1509
1510 if (state->update_name == NULL || state->session_info == NULL) {
1511 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1512 return false;
1513 }
1514
1515 /* Do not use client credentials, if we're not updating the client specified name */
1516 if (strcmp(state->update_name, name) != 0) {
1517 return true;
1518 }
1519
1520 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1521 if (ret != LDB_SUCCESS) {
1522 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1523 return false;
1524 }
1525
1526 return true;
1527 }
1528
1529 /*
1530 * Reset session_info on samdb as system session
1531 */
1532 static void b9_reset_session_info(struct dlz_bind9_data *state)
1533 {
1534 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1535 }
1536
1537 /*
1538 add or modify a rdataset
1539 */
1540 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1541 {
1542 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1543 struct dnsp_DnssrvRpcRecord *rec;
1544 struct ldb_dn *dn;
1545 isc_result_t result;
1546 struct ldb_result *res;
1547 const char *attrs[] = { "dnsRecord", NULL };
1548 int ret, i;
1549 struct ldb_message_element *el;
1550 enum ndr_err_code ndr_err;
1551 NTTIME t;
1552
1553 if (state->transaction_token != (void*)version) {
1554 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1555 return ISC_R_FAILURE;
1556 }
1557
1558 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1559 if (rec == NULL) {
1560 return ISC_R_NOMEMORY;
1561 }
1562
1563 unix_to_nt_time(&t, time(NULL));
1564 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1565 t /= 3600; /* convert to hours */
1566
1567 rec->rank = DNS_RANK_ZONE;
1568 rec->dwSerial = state->soa_serial;
1569 rec->dwTimeStamp = (uint32_t)t;
1570
1571 if (!b9_parse(state, rdatastr, rec)) {
1572 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1573 talloc_free(rec);
1574 return ISC_R_FAILURE;
1575 }
1576
1577 /* find the DN of the record */
1578 result = b9_find_name_dn(state, name, rec, &dn);
1579 if (result != ISC_R_SUCCESS) {
1580 talloc_free(rec);
1581 return result;
1582 }
1583
1584 /* get any existing records */
1585 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1586 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1587 if (!b9_set_session_info(state, name)) {
1588 talloc_free(rec);
1589 return ISC_R_FAILURE;
1590 }
1591 result = b9_add_record(state, name, dn, rec);
1592 b9_reset_session_info(state);
1593 talloc_free(rec);
1594 if (result == ISC_R_SUCCESS) {
1595 state->log(ISC_LOG_INFO, "samba_dlz: added %s %s", name, rdatastr);
1596 }
1597 return result;
1598 }
1599
1600 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1601 if (el == NULL) {
1602 ret = ldb_msg_add_empty(res->msgs[0], "dnsRecord", LDB_FLAG_MOD_ADD, &el);
1603 if (ret != LDB_SUCCESS) {
1604 state->log(ISC_LOG_ERROR, "samba_dlz: failed to add dnsRecord for %s",
1605 ldb_dn_get_linearized(dn));
1606 talloc_free(rec);
1607 return ISC_R_FAILURE;
1608 }
1609 }
1610
1611 /* there are existing records. We need to see if this will
1612 * replace a record or add to it
1613 */
1614 for (i=0; i<el->num_values; i++) {
1615 struct dnsp_DnssrvRpcRecord rec2;
1616
1617 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1618 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1619 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1620 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1621 ldb_dn_get_linearized(dn));
1622 talloc_free(rec);
1623 return ISC_R_FAILURE;
1624 }
1625
1626 if (b9_record_match(state, rec, &rec2)) {
1627 break;
1628 }
1629 }
1630 if (i == el->num_values) {
1631 /* adding a new value */
1632 el->values = talloc_realloc(el, el->values, struct ldb_val, el->num_values+1);
1633 if (el->values == NULL) {
1634 talloc_free(rec);
1635 return ISC_R_NOMEMORY;
1636 }
1637 el->num_values++;
1638 }
1639
1640 ndr_err = ndr_push_struct_blob(&el->values[i], rec, rec,
1641 (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1642 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1643 state->log(ISC_LOG_ERROR, "samba_dlz: failed to push dnsRecord for %s",
1644 ldb_dn_get_linearized(dn));
1645 talloc_free(rec);
1646 return ISC_R_FAILURE;
1647 }
1648
1649
1650 if (!b9_set_session_info(state, name)) {
1651 talloc_free(rec);
1652 return ISC_R_FAILURE;
1653 }
1654
1655 /* modify the record */
1656 el->flags = LDB_FLAG_MOD_REPLACE;
1657 ret = ldb_modify(state->samdb, res->msgs[0]);
1658 b9_reset_session_info(state);
1659 if (ret != LDB_SUCCESS) {
1660 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1661 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1662 talloc_free(rec);
1663 return ISC_R_FAILURE;
1664 }
1665
1666 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1667
1668 talloc_free(rec);
1669 return ISC_R_SUCCESS;
1670 }
1671
1672 /*
1673 remove a rdataset
1674 */
1675 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1676 {
1677 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1678 struct dnsp_DnssrvRpcRecord *rec;
1679 struct ldb_dn *dn;
1680 isc_result_t result;
1681 struct ldb_result *res;
1682 const char *attrs[] = { "dnsRecord", NULL };
1683 int ret, i;
1684 struct ldb_message_element *el;
1685 enum ndr_err_code ndr_err;
1686
1687 if (state->transaction_token != (void*)version) {
1688 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1689 return ISC_R_FAILURE;
1690 }
1691
1692 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1693 if (rec == NULL) {
1694 return ISC_R_NOMEMORY;
1695 }
1696
1697 if (!b9_parse(state, rdatastr, rec)) {
1698 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1699 talloc_free(rec);
1700 return ISC_R_FAILURE;
1701 }
1702
1703 /* find the DN of the record */
1704 result = b9_find_name_dn(state, name, rec, &dn);
1705 if (result != ISC_R_SUCCESS) {
1706 talloc_free(rec);
1707 return result;
1708 }
1709
1710 /* get the existing records */
1711 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1712 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1713 talloc_free(rec);
1714 return ISC_R_NOTFOUND;
1715 }
1716
1717 /* there are existing records. We need to see if any match
1718 */
1719 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1720 if (el == NULL || el->num_values == 0) {
1721 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1722 ldb_dn_get_linearized(dn));
1723 talloc_free(rec);
1724 return ISC_R_FAILURE;
1725 }
1726
1727 for (i=0; i<el->num_values; i++) {
1728 struct dnsp_DnssrvRpcRecord rec2;
1729
1730 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1731 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1732 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1733 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1734 ldb_dn_get_linearized(dn));
1735 talloc_free(rec);
1736 return ISC_R_FAILURE;
1737 }
1738
1739 if (b9_record_match(state, rec, &rec2)) {
1740 break;
1741 }
1742 }
1743 if (i == el->num_values) {
1744 talloc_free(rec);
1745 return ISC_R_NOTFOUND;
1746 }
1747
1748 if (i < el->num_values-1) {
1749 memmove(&el->values[i], &el->values[i+1], sizeof(el->values[0])*((el->num_values-1)-i));
1750 }
1751 el->num_values--;
1752
1753 if (!b9_set_session_info(state, name)) {
1754 talloc_free(rec);
1755 return ISC_R_FAILURE;
1756 }
1757
1758 if (el->num_values == 0) {
1759 el->flags = LDB_FLAG_MOD_DELETE;
1760 } else {
1761 el->flags = LDB_FLAG_MOD_REPLACE;
1762 }
1763 ret = ldb_modify(state->samdb, res->msgs[0]);
1764
1765 b9_reset_session_info(state);
1766 if (ret != LDB_SUCCESS) {
1767 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1768 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1769 talloc_free(rec);
1770 return ISC_R_FAILURE;
1771 }
1772
1773 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1774
1775 talloc_free(rec);
1776 return ISC_R_SUCCESS;
1777 }
1778
1779
1780 /*
1781 delete all records of the given type
1782 */
1783 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1784 {
1785 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1786 TALLOC_CTX *tmp_ctx;
1787 struct ldb_dn *dn;
1788 isc_result_t result;
1789 struct ldb_result *res;
1790 const char *attrs[] = { "dnsRecord", NULL };
1791 int ret, i;
1792 struct ldb_message_element *el;
1793 enum ndr_err_code ndr_err;
1794 enum dns_record_type dns_type;
1795 bool found = false;
1796
1797 if (state->transaction_token != (void*)version) {
1798 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1799 return ISC_R_FAILURE;
1800 }
1801
1802 if (!b9_dns_type(type, &dns_type)) {
1803 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1804 return ISC_R_FAILURE;
1805 }
1806
1807 tmp_ctx = talloc_new(state);
1808
1809 /* find the DN of the record */
1810 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1811 if (result != ISC_R_SUCCESS) {
1812 talloc_free(tmp_ctx);
1813 return result;
1814 }
1815
1816 /* get the existing records */
1817 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1818 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1819 talloc_free(tmp_ctx);
1820 return ISC_R_NOTFOUND;
1821 }
1822
1823 /* there are existing records. We need to see if any match the type
1824 */
1825 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1826 if (el == NULL || el->num_values == 0) {
1827 talloc_free(tmp_ctx);
1828 return ISC_R_NOTFOUND;
1829 }
1830
1831 for (i=0; i<el->num_values; i++) {
1832 struct dnsp_DnssrvRpcRecord rec2;
1833
1834 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec2,
1835 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1836 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1837 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1838 ldb_dn_get_linearized(dn));
1839 talloc_free(tmp_ctx);
1840 return ISC_R_FAILURE;
1841 }
1842
1843 if (dns_type == rec2.wType) {
1844 if (i < el->num_values-1) {
1845 memmove(&el->values[i], &el->values[i+1],
1846 sizeof(el->values[0])*((el->num_values-1)-i));
1847 }
1848 el->num_values--;
1849 i--;
1850 found = true;
1851 }
1852 }
1853
1854 if (!found) {
1855 talloc_free(tmp_ctx);
1856 return ISC_R_FAILURE;
1857 }
1858
1859 if (!b9_set_session_info(state, name)) {
1860 talloc_free(tmp_ctx);
1861 return ISC_R_FAILURE;
1862 }
1863
1864 if (el->num_values == 0) {
1865 el->flags = LDB_FLAG_MOD_DELETE;
1866 } else {
1867 el->flags = LDB_FLAG_MOD_REPLACE;
1868 }
1869 ret = ldb_modify(state->samdb, res->msgs[0]);
1870
1871 b9_reset_session_info(state);
1872 if (ret != LDB_SUCCESS) {
1873 state->log(ISC_LOG_ERROR, "samba_dlz: failed to delete type %s in %s - %s",
1874 type, ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1875 talloc_free(tmp_ctx);
1876 return ISC_R_FAILURE;
1877 }
1878
1879 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1880
1881 talloc_free(tmp_ctx);
1882 return ISC_R_SUCCESS;
1883 }
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