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s4 dns: Actually handle the update request
[Samba/gebeck_regimport.git] / source4 / dns_server / dlz_bind9.c
blob97eaac8564fa96d415dbd848cc6ed53695e4b2cb
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 "dlz_minimal.h"
40
41
42 struct b9_options {
43 const char *url;
44 const char *debug;
45 };
46
47 struct dlz_bind9_data {
48 struct b9_options options;
49 struct ldb_context *samdb;
50 struct tevent_context *ev_ctx;
51 struct loadparm_context *lp;
52 int *transaction_token;
53 uint32_t soa_serial;
54
55 /* Used for dynamic update */
56 struct smb_krb5_context *smb_krb5_ctx;
57 struct auth_session_info *session_info;
58 char *update_name;
59
60 /* helper functions from the dlz_dlopen driver */
61 void (*log)(int level, const char *fmt, ...);
62 isc_result_t (*putrr)(dns_sdlzlookup_t *handle, const char *type,
63 dns_ttl_t ttl, const char *data);
64 isc_result_t (*putnamedrr)(dns_sdlzlookup_t *handle, const char *name,
65 const char *type, dns_ttl_t ttl, const char *data);
66 isc_result_t (*writeable_zone)(dns_view_t *view, const char *zone_name);
67 };
68
69
70 static const char *zone_prefixes[] = {
71 "CN=MicrosoftDNS,DC=DomainDnsZones",
72 "CN=MicrosoftDNS,DC=ForestDnsZones",
73 "CN=MicrosoftDNS,CN=System",
74 NULL
75 };
76
77 /*
78 return the version of the API
79 */
80 _PUBLIC_ int dlz_version(unsigned int *flags)
81 {
82 return DLZ_DLOPEN_VERSION;
83 }
84
85 /*
86 remember a helper function from the bind9 dlz_dlopen driver
87 */
88 static void b9_add_helper(struct dlz_bind9_data *state, const char *helper_name, void *ptr)
89 {
90 if (strcmp(helper_name, "log") == 0) {
91 state->log = ptr;
92 }
93 if (strcmp(helper_name, "putrr") == 0) {
94 state->putrr = ptr;
95 }
96 if (strcmp(helper_name, "putnamedrr") == 0) {
97 state->putnamedrr = ptr;
98 }
99 if (strcmp(helper_name, "writeable_zone") == 0) {
100 state->writeable_zone = ptr;
101 }
102 }
103
104 /*
105 format a record for bind9
106 */
107 static bool b9_format(struct dlz_bind9_data *state,
108 TALLOC_CTX *mem_ctx,
109 struct dnsp_DnssrvRpcRecord *rec,
110 const char **type, const char **data)
111 {
112 switch (rec->wType) {
113 case DNS_TYPE_A:
114 *type = "a";
115 *data = rec->data.ipv4;
116 break;
117
118 case DNS_TYPE_AAAA:
119 *type = "aaaa";
120 *data = rec->data.ipv6;
121 break;
122
123 case DNS_TYPE_CNAME:
124 *type = "cname";
125 *data = rec->data.cname;
126 break;
127
128 case DNS_TYPE_TXT:
129 *type = "txt";
130 *data = rec->data.txt;
131 break;
132
133 case DNS_TYPE_PTR:
134 *type = "ptr";
135 *data = rec->data.ptr;
136 break;
137
138 case DNS_TYPE_SRV:
139 *type = "srv";
140 *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
141 rec->data.srv.wPriority,
142 rec->data.srv.wWeight,
143 rec->data.srv.wPort,
144 rec->data.srv.nameTarget);
145 break;
146
147 case DNS_TYPE_MX:
148 *type = "mx";
149 *data = talloc_asprintf(mem_ctx, "%u %s",
150 rec->data.mx.wPriority,
151 rec->data.mx.nameTarget);
152 break;
153
154 case DNS_TYPE_HINFO:
155 *type = "hinfo";
156 *data = talloc_asprintf(mem_ctx, "%s %s",
157 rec->data.hinfo.cpu,
158 rec->data.hinfo.os);
159 break;
160
161 case DNS_TYPE_NS:
162 *type = "ns";
163 *data = rec->data.ns;
164 break;
165
166 case DNS_TYPE_SOA: {
167 const char *mname;
168 *type = "soa";
169
170 /* we need to fake the authoritative nameserver to
171 * point at ourselves. This is how AD DNS servers
172 * force clients to send updates to the right local DC
173 */
174 mname = talloc_asprintf(mem_ctx, "%s.%s",
175 lpcfg_netbios_name(state->lp), lpcfg_dnsdomain(state->lp));
176 if (mname == NULL) {
177 return false;
178 }
179 mname = strlower_talloc(mem_ctx, mname);
180 if (mname == NULL) {
181 return false;
182 }
183
184 state->soa_serial = rec->data.soa.serial;
185
186 *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
187 mname,
188 rec->data.soa.rname,
189 rec->data.soa.serial,
190 rec->data.soa.refresh,
191 rec->data.soa.retry,
192 rec->data.soa.expire,
193 rec->data.soa.minimum);
194 break;
195 }
196
197 default:
198 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
199 rec->wType);
200 return false;
201 }
202
203 return true;
204 }
205
206 static const struct {
207 enum dns_record_type dns_type;
208 const char *typestr;
209 bool single_valued;
210 } dns_typemap[] = {
211 { DNS_TYPE_A, "A" , false},
212 { DNS_TYPE_AAAA, "AAAA" , false},
213 { DNS_TYPE_CNAME, "CNAME" , true},
214 { DNS_TYPE_TXT, "TXT" , false},
215 { DNS_TYPE_PTR, "PTR" , false},
216 { DNS_TYPE_SRV, "SRV" , false},
217 { DNS_TYPE_MX, "MX" , false},
218 { DNS_TYPE_HINFO, "HINFO" , false},
219 { DNS_TYPE_NS, "NS" , false},
220 { DNS_TYPE_SOA, "SOA" , true},
221 };
222
223
224 /*
225 see if a DNS type is single valued
226 */
227 static bool b9_single_valued(enum dns_record_type dns_type)
228 {
229 int i;
230 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
231 if (dns_typemap[i].dns_type == dns_type) {
232 return dns_typemap[i].single_valued;
233 }
234 }
235 return false;
236 }
237
238 /*
239 see if a DNS type is single valued
240 */
241 static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
242 {
243 int i;
244 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
245 if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
246 *dtype = dns_typemap[i].dns_type;
247 return true;
248 }
249 }
250 return false;
251 }
252
253
254 #define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
255 (ret) = strtok_r(str, sep, &saveptr); \
256 if ((ret) == NULL) return false; \
257 } while (0)
258
259 #define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
260 char *istr = strtok_r(str, sep, &saveptr); \
261 if ((istr) == NULL) return false; \
262 (ret) = strtoul(istr, NULL, 10); \
263 } while (0)
264
265 /*
266 parse a record from bind9
267 */
268 static bool b9_parse(struct dlz_bind9_data *state,
269 const char *rdatastr,
270 struct dnsp_DnssrvRpcRecord *rec)
271 {
272 char *full_name, *dclass, *type;
273 char *str, *saveptr=NULL;
274 int i;
275
276 str = talloc_strdup(rec, rdatastr);
277 if (str == NULL) {
278 return false;
279 }
280
281 /* parse the SDLZ string form */
282 DNS_PARSE_STR(full_name, str, "\t", saveptr);
283 DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
284 DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
285 DNS_PARSE_STR(type, NULL, "\t", saveptr);
286
287 /* construct the record */
288 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
289 if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
290 rec->wType = dns_typemap[i].dns_type;
291 break;
292 }
293 }
294 if (i == ARRAY_SIZE(dns_typemap)) {
295 state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
296 type, full_name);
297 return false;
298 }
299
300 switch (rec->wType) {
301 case DNS_TYPE_A:
302 DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
303 break;
304
305 case DNS_TYPE_AAAA:
306 DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
307 break;
308
309 case DNS_TYPE_CNAME:
310 DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
311 break;
312
313 case DNS_TYPE_TXT:
314 DNS_PARSE_STR(rec->data.txt, NULL, "\t", saveptr);
315 break;
316
317 case DNS_TYPE_PTR:
318 DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
319 break;
320
321 case DNS_TYPE_SRV:
322 DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
323 DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
324 DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
325 DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
326 break;
327
328 case DNS_TYPE_MX:
329 DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
330 DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
331 break;
332
333 case DNS_TYPE_HINFO:
334 DNS_PARSE_STR(rec->data.hinfo.cpu, NULL, " ", saveptr);
335 DNS_PARSE_STR(rec->data.hinfo.os, NULL, " ", saveptr);
336 break;
337
338 case DNS_TYPE_NS:
339 DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
340 break;
341
342 case DNS_TYPE_SOA:
343 DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
344 DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
345 DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
346 DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
347 DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
348 DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
349 DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
350 break;
351
352 default:
353 state->log(ISC_LOG_ERROR, "samba b9_parse: unhandled record type %u",
354 rec->wType);
355 return false;
356 }
357
358 /* we should be at the end of the buffer now */
359 if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
360 state->log(ISC_LOG_ERROR, "samba b9_parse: expected data at end of string for '%s'");
361 return false;
362 }
363
364 return true;
365 }
366
367 /*
368 send a resource recond to bind9
369 */
370 static isc_result_t b9_putrr(struct dlz_bind9_data *state,
371 void *handle, struct dnsp_DnssrvRpcRecord *rec,
372 const char **types)
373 {
374 isc_result_t result;
375 const char *type, *data;
376 TALLOC_CTX *tmp_ctx = talloc_new(state);
377
378 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
379 return ISC_R_FAILURE;
380 }
381
382 if (data == NULL) {
383 talloc_free(tmp_ctx);
384 return ISC_R_NOMEMORY;
385 }
386
387 if (types) {
388 int i;
389 for (i=0; types[i]; i++) {
390 if (strcmp(types[i], type) == 0) break;
391 }
392 if (types[i] == NULL) {
393 /* skip it */
394 return ISC_R_SUCCESS;
395 }
396 }
397
398 result = state->putrr(handle, type, rec->dwTtlSeconds, data);
399 if (result != ISC_R_SUCCESS) {
400 state->log(ISC_LOG_ERROR, "Failed to put rr");
401 }
402 talloc_free(tmp_ctx);
403 return result;
404 }
405
406
407 /*
408 send a named resource recond to bind9
409 */
410 static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
411 void *handle, const char *name,
412 struct dnsp_DnssrvRpcRecord *rec)
413 {
414 isc_result_t result;
415 const char *type, *data;
416 TALLOC_CTX *tmp_ctx = talloc_new(state);
417
418 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
419 return ISC_R_FAILURE;
420 }
421
422 if (data == NULL) {
423 talloc_free(tmp_ctx);
424 return ISC_R_NOMEMORY;
425 }
426
427 result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
428 if (result != ISC_R_SUCCESS) {
429 state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
430 }
431 talloc_free(tmp_ctx);
432 return result;
433 }
434
435 /*
436 parse options
437 */
438 static isc_result_t parse_options(struct dlz_bind9_data *state,
439 unsigned int argc, char *argv[],
440 struct b9_options *options)
441 {
442 int opt;
443 poptContext pc;
444 struct poptOption long_options[] = {
445 { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
446 { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
447 { NULL }
448 };
449
450 pc = poptGetContext("dlz_bind9", argc, (const char **)argv, long_options,
451 POPT_CONTEXT_KEEP_FIRST);
452 while ((opt = poptGetNextOpt(pc)) != -1) {
453 switch (opt) {
454 default:
455 state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
456 poptBadOption(pc, 0), poptStrerror(opt));
457 return ISC_R_FAILURE;
458 }
459 }
460
461 return ISC_R_SUCCESS;
462 }
463
464
465 /*
466 called to initialise the driver
467 */
468 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
469 unsigned int argc, char *argv[],
470 void **dbdata, ...)
471 {
472 struct dlz_bind9_data *state;
473 const char *helper_name;
474 va_list ap;
475 isc_result_t result;
476 TALLOC_CTX *tmp_ctx;
477 struct ldb_dn *dn;
478 NTSTATUS nt_status;
479
480 state = talloc_zero(NULL, struct dlz_bind9_data);
481 if (state == NULL) {
482 return ISC_R_NOMEMORY;
483 }
484
485 tmp_ctx = talloc_new(state);
486
487 /* fill in the helper functions */
488 va_start(ap, dbdata);
489 while ((helper_name = va_arg(ap, const char *)) != NULL) {
490 b9_add_helper(state, helper_name, va_arg(ap, void*));
491 }
492 va_end(ap);
493
494 /* Do not install samba signal handlers */
495 fault_setup_disable();
496
497 /* Start logging */
498 setup_logging("samba_dlz", DEBUG_DEFAULT_STDERR);
499
500 state->ev_ctx = s4_event_context_init(state);
501 if (state->ev_ctx == NULL) {
502 result = ISC_R_NOMEMORY;
503 goto failed;
504 }
505
506 result = parse_options(state, argc, argv, &state->options);
507 if (result != ISC_R_SUCCESS) {
508 goto failed;
509 }
510
511 state->lp = loadparm_init_global(true);
512 if (state->lp == NULL) {
513 result = ISC_R_NOMEMORY;
514 goto failed;
515 }
516
517 if (state->options.debug) {
518 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
519 } else {
520 lpcfg_do_global_parameter(state->lp, "log level", "0");
521 }
522
523 if (smb_krb5_init_context(state, state->ev_ctx, state->lp, &state->smb_krb5_ctx) != 0) {
524 result = ISC_R_NOMEMORY;
525 goto failed;
526 }
527
528 nt_status = gensec_init();
529 if (!NT_STATUS_IS_OK(nt_status)) {
530 talloc_free(tmp_ctx);
531 return false;
532 }
533
534 if (state->options.url == NULL) {
535 state->options.url = lpcfg_private_path(state, state->lp, "dns/sam.ldb");
536 if (state->options.url == NULL) {
537 result = ISC_R_NOMEMORY;
538 goto failed;
539 }
540 }
541
542 state->samdb = samdb_connect_url(state, state->ev_ctx, state->lp,
543 system_session(state->lp), 0, state->options.url);
544 if (state->samdb == NULL) {
545 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to connect to %s",
546 state->options.url);
547 result = ISC_R_FAILURE;
548 goto failed;
549 }
550
551 dn = ldb_get_default_basedn(state->samdb);
552 if (dn == NULL) {
553 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
554 state->options.url, ldb_errstring(state->samdb));
555 result = ISC_R_FAILURE;
556 goto failed;
557 }
558
559 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
560 ldb_dn_get_linearized(dn));
561
562 *dbdata = state;
563
564 talloc_free(tmp_ctx);
565 return ISC_R_SUCCESS;
566
567 failed:
568 talloc_free(state);
569 return result;
570 }
571
572 /*
573 shutdown the backend
574 */
575 _PUBLIC_ void dlz_destroy(void *dbdata)
576 {
577 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
578 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
579 talloc_free(state);
580 }
581
582
583 /*
584 return the base DN for a zone
585 */
586 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
587 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
588 {
589 int ret;
590 TALLOC_CTX *tmp_ctx = talloc_new(state);
591 const char *attrs[] = { NULL };
592 int i;
593
594 for (i=0; zone_prefixes[i]; i++) {
595 struct ldb_dn *dn;
596 struct ldb_result *res;
597
598 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
599 if (dn == NULL) {
600 talloc_free(tmp_ctx);
601 return ISC_R_NOMEMORY;
602 }
603
604 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
605 talloc_free(tmp_ctx);
606 return ISC_R_NOMEMORY;
607 }
608
609 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
610 if (ret == LDB_SUCCESS) {
611 if (zone_dn != NULL) {
612 *zone_dn = talloc_steal(mem_ctx, dn);
613 }
614 talloc_free(tmp_ctx);
615 return ISC_R_SUCCESS;
616 }
617 talloc_free(dn);
618 }
619
620 talloc_free(tmp_ctx);
621 return ISC_R_NOTFOUND;
622 }
623
624
625 /*
626 return the DN for a name. The record does not need to exist, but the
627 zone must exist
628 */
629 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
630 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
631 {
632 const char *p;
633
634 /* work through the name piece by piece, until we find a zone */
635 for (p=name; p; ) {
636 isc_result_t result;
637 result = b9_find_zone_dn(state, p, mem_ctx, dn);
638 if (result == ISC_R_SUCCESS) {
639 /* we found a zone, now extend the DN to get
640 * the full DN
641 */
642 bool ret;
643 if (p == name) {
644 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
645 } else {
646 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
647 }
648 if (!ret) {
649 talloc_free(*dn);
650 return ISC_R_NOMEMORY;
651 }
652 return ISC_R_SUCCESS;
653 }
654 p = strchr(p, '.');
655 if (p == NULL) {
656 break;
657 }
658 p++;
659 }
660 return ISC_R_NOTFOUND;
661 }
662
663
664 /*
665 see if we handle a given zone
666 */
667 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
668 {
669 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
670 return b9_find_zone_dn(state, name, NULL, NULL);
671 }
672
673
674 /*
675 lookup one record
676 */
677 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
678 const char *zone, const char *name,
679 dns_sdlzlookup_t *lookup,
680 const char **types)
681 {
682 TALLOC_CTX *tmp_ctx = talloc_new(state);
683 const char *attrs[] = { "dnsRecord", NULL };
684 int ret = LDB_SUCCESS, i;
685 struct ldb_result *res;
686 struct ldb_message_element *el;
687 struct ldb_dn *dn;
688
689 for (i=0; zone_prefixes[i]; i++) {
690 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
691 if (dn == NULL) {
692 talloc_free(tmp_ctx);
693 return ISC_R_NOMEMORY;
694 }
695
696 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
697 talloc_free(tmp_ctx);
698 return ISC_R_NOMEMORY;
699 }
700
701 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
702 attrs, "objectClass=dnsNode");
703 if (ret == LDB_SUCCESS) {
704 break;
705 }
706 }
707 if (ret != LDB_SUCCESS) {
708 talloc_free(tmp_ctx);
709 return ISC_R_NOTFOUND;
710 }
711
712 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
713 if (el == NULL || el->num_values == 0) {
714 talloc_free(tmp_ctx);
715 return ISC_R_NOTFOUND;
716 }
717
718 for (i=0; i<el->num_values; i++) {
719 struct dnsp_DnssrvRpcRecord rec;
720 enum ndr_err_code ndr_err;
721 isc_result_t result;
722
723 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
724 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
725 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
726 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
727 ldb_dn_get_linearized(dn));
728 talloc_free(tmp_ctx);
729 return ISC_R_FAILURE;
730 }
731
732 result = b9_putrr(state, lookup, &rec, types);
733 if (result != ISC_R_SUCCESS) {
734 talloc_free(tmp_ctx);
735 return result;
736 }
737 }
738
739 talloc_free(tmp_ctx);
740 return ISC_R_SUCCESS;
741 }
742
743 /*
744 lookup one record
745 */
746 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
747 void *dbdata, dns_sdlzlookup_t *lookup)
748 {
749 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
750 return dlz_lookup_types(state, zone, name, lookup, NULL);
751 }
752
753
754 /*
755 see if a zone transfer is allowed
756 */
757 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
758 {
759 /* just say yes for all our zones for now */
760 return dlz_findzonedb(dbdata, name);
761 }
762
763 /*
764 perform a zone transfer
765 */
766 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
767 dns_sdlzallnodes_t *allnodes)
768 {
769 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
770 const char *attrs[] = { "dnsRecord", NULL };
771 int ret = LDB_SUCCESS, i, j;
772 struct ldb_dn *dn;
773 struct ldb_result *res;
774 TALLOC_CTX *tmp_ctx = talloc_new(state);
775
776 for (i=0; zone_prefixes[i]; i++) {
777 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
778 if (dn == NULL) {
779 talloc_free(tmp_ctx);
780 return ISC_R_NOMEMORY;
781 }
782
783 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
784 talloc_free(tmp_ctx);
785 return ISC_R_NOMEMORY;
786 }
787
788 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
789 attrs, "objectClass=dnsNode");
790 if (ret == LDB_SUCCESS) {
791 break;
792 }
793 }
794 if (ret != LDB_SUCCESS) {
795 talloc_free(tmp_ctx);
796 return ISC_R_NOTFOUND;
797 }
798
799 for (i=0; i<res->count; i++) {
800 struct ldb_message_element *el;
801 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
802 const char *rdn, *name;
803 const struct ldb_val *v;
804
805 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
806 if (el == NULL || el->num_values == 0) {
807 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
808 ldb_dn_get_linearized(dn));
809 talloc_free(el_ctx);
810 continue;
811 }
812
813 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
814 if (v == NULL) {
815 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
816 ldb_dn_get_linearized(dn));
817 talloc_free(el_ctx);
818 continue;
819 }
820
821 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
822 if (rdn == NULL) {
823 talloc_free(tmp_ctx);
824 return ISC_R_NOMEMORY;
825 }
826
827 if (strcmp(rdn, "@") == 0) {
828 name = zone;
829 } else {
830 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
831 }
832 if (name == NULL) {
833 talloc_free(tmp_ctx);
834 return ISC_R_NOMEMORY;
835 }
836
837 for (j=0; j<el->num_values; j++) {
838 struct dnsp_DnssrvRpcRecord rec;
839 enum ndr_err_code ndr_err;
840 isc_result_t result;
841
842 ndr_err = ndr_pull_struct_blob(&el->values[j], el_ctx, &rec,
843 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
844 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
845 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
846 ldb_dn_get_linearized(dn));
847 continue;
848 }
849
850 result = b9_putnamedrr(state, allnodes, name, &rec);
851 if (result != ISC_R_SUCCESS) {
852 continue;
853 }
854 }
855 }
856
857 talloc_free(tmp_ctx);
858
859 return ISC_R_SUCCESS;
860 }
861
862
863 /*
864 start a transaction
865 */
866 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
867 {
868 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
869
870 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
871
872 if (state->transaction_token != NULL) {
873 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
874 return ISC_R_FAILURE;
875 }
876
877 state->transaction_token = talloc_zero(state, int);
878 if (state->transaction_token == NULL) {
879 return ISC_R_NOMEMORY;
880 }
881
882 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
883 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
884 talloc_free(state->transaction_token);
885 state->transaction_token = NULL;
886 return ISC_R_FAILURE;
887 }
888
889 *versionp = (void *)state->transaction_token;
890
891 return ISC_R_SUCCESS;
892 }
893
894 /*
895 end a transaction
896 */
897 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
898 void *dbdata, void **versionp)
899 {
900 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
901
902 if (state->transaction_token != (int *)*versionp) {
903 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
904 return;
905 }
906
907 if (commit) {
908 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
909 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
910 return;
911 }
912 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
913 } else {
914 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
915 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
916 return;
917 }
918 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
919 }
920
921 talloc_free(state->transaction_token);
922 state->transaction_token = NULL;
923 *versionp = NULL;
924 }
925
926
927 /*
928 see if there is a SOA record for a zone
929 */
930 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
931 {
932 const char *attrs[] = { "dnsRecord", NULL };
933 struct ldb_result *res;
934 struct ldb_message_element *el;
935 TALLOC_CTX *tmp_ctx = talloc_new(state);
936 int ret, i;
937
938 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
939 talloc_free(tmp_ctx);
940 return false;
941 }
942
943 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
944 attrs, "objectClass=dnsNode");
945 if (ret != LDB_SUCCESS) {
946 talloc_free(tmp_ctx);
947 return false;
948 }
949
950 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
951 if (el == NULL) {
952 talloc_free(tmp_ctx);
953 return false;
954 }
955 for (i=0; i<el->num_values; i++) {
956 struct dnsp_DnssrvRpcRecord rec;
957 enum ndr_err_code ndr_err;
958
959 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
960 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
961 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
962 continue;
963 }
964 if (rec.wType == DNS_TYPE_SOA) {
965 talloc_free(tmp_ctx);
966 return true;
967 }
968 }
969
970 talloc_free(tmp_ctx);
971 return false;
972 }
973
974 /*
975 configure a writeable zone
976 */
977 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
978 {
979 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
980 TALLOC_CTX *tmp_ctx;
981 struct ldb_dn *dn;
982 int i;
983
984 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
985 if (state->writeable_zone == NULL) {
986 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
987 return ISC_R_FAILURE;
988 }
989
990 tmp_ctx = talloc_new(state);
991
992 for (i=0; zone_prefixes[i]; i++) {
993 const char *attrs[] = { "name", NULL };
994 int j, ret;
995 struct ldb_result *res;
996
997 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
998 if (dn == NULL) {
999 talloc_free(tmp_ctx);
1000 return ISC_R_NOMEMORY;
1001 }
1002
1003 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1004 talloc_free(tmp_ctx);
1005 return ISC_R_NOMEMORY;
1006 }
1007
1008 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1009 attrs, "objectClass=dnsZone");
1010 if (ret != LDB_SUCCESS) {
1011 continue;
1012 }
1013
1014 for (j=0; j<res->count; j++) {
1015 isc_result_t result;
1016 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1017 struct ldb_dn *zone_dn;
1018
1019 if (zone == NULL) {
1020 continue;
1021 }
1022 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1023 if (zone_dn == NULL) {
1024 talloc_free(tmp_ctx);
1025 return ISC_R_NOMEMORY;
1026 }
1027
1028 if (!b9_has_soa(state, zone_dn, zone)) {
1029 continue;
1030 }
1031 result = state->writeable_zone(view, zone);
1032 if (result != ISC_R_SUCCESS) {
1033 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1034 zone);
1035 talloc_free(tmp_ctx);
1036 return result;
1037 }
1038 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1039 }
1040 }
1041
1042 talloc_free(tmp_ctx);
1043 return ISC_R_SUCCESS;
1044 }
1045
1046 /*
1047 authorize a zone update
1048 */
1049 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1050 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1051 void *dbdata)
1052 {
1053 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1054 TALLOC_CTX *tmp_ctx;
1055 DATA_BLOB ap_req;
1056 struct cli_credentials *server_credentials;
1057 char *keytab_name;
1058 int ret;
1059 int ldb_ret;
1060 NTSTATUS nt_status;
1061 struct gensec_security *gensec_ctx;
1062 struct auth_session_info *session_info;
1063 struct ldb_dn *dn;
1064 isc_result_t result;
1065 struct ldb_result *res;
1066 const char * attrs[] = { NULL };
1067 uint32_t access_mask;
1068
1069 /* Remove cached credentials, if any */
1070 if (state->session_info) {
1071 talloc_free(state->session_info);
1072 state->session_info = NULL;
1073 }
1074 if (state->update_name) {
1075 talloc_free(state->update_name);
1076 state->update_name = NULL;
1077 }
1078
1079 tmp_ctx = talloc_new(NULL);
1080 if (tmp_ctx == NULL) {
1081 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1082 return false;
1083 }
1084
1085 ap_req = data_blob_const(keydata, keydatalen);
1086 server_credentials = cli_credentials_init(tmp_ctx);
1087 if (!server_credentials) {
1088 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1089 talloc_free(tmp_ctx);
1090 return false;
1091 }
1092
1093 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1094 cli_credentials_set_conf(server_credentials, state->lp);
1095
1096 keytab_name = talloc_asprintf(tmp_ctx, "file:%s/dns.keytab",
1097 lpcfg_private_dir(state->lp));
1098 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1099 CRED_SPECIFIED);
1100 if (ret != 0) {
1101 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1102 keytab_name);
1103 talloc_free(tmp_ctx);
1104 return false;
1105 }
1106 talloc_free(keytab_name);
1107
1108 nt_status = gensec_server_start(tmp_ctx,
1109 lpcfg_gensec_settings(tmp_ctx, state->lp),
1110 NULL, &gensec_ctx);
1111 if (!NT_STATUS_IS_OK(nt_status)) {
1112 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1113 talloc_free(tmp_ctx);
1114 return false;
1115 }
1116
1117 gensec_set_credentials(gensec_ctx, server_credentials);
1118
1119 nt_status = gensec_start_mech_by_name(gensec_ctx, "spnego");
1120 if (!NT_STATUS_IS_OK(nt_status)) {
1121 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1122 talloc_free(tmp_ctx);
1123 return false;
1124 }
1125
1126 nt_status = gensec_update(gensec_ctx, tmp_ctx, state->ev_ctx, ap_req, &ap_req);
1127 if (!NT_STATUS_IS_OK(nt_status)) {
1128 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1129 talloc_free(tmp_ctx);
1130 return false;
1131 }
1132
1133 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1134 if (!NT_STATUS_IS_OK(nt_status)) {
1135 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1136 talloc_free(tmp_ctx);
1137 return false;
1138 }
1139
1140 /* Get the DN from name */
1141 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1142 if (result != ISC_R_SUCCESS) {
1143 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1144 talloc_free(tmp_ctx);
1145 return false;
1146 }
1147
1148 /* make sure the dn exists, or find parent dn in case new object is being added */
1149 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1150 attrs, "objectClass=dnsNode");
1151 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1152 ldb_dn_remove_child_components(dn, 1);
1153 access_mask = SEC_ADS_CREATE_CHILD;
1154 talloc_free(res);
1155 } else if (ldb_ret == LDB_SUCCESS) {
1156 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1157 talloc_free(res);
1158 } else {
1159 talloc_free(tmp_ctx);
1160 return false;
1161 }
1162
1163 /* Do ACL check */
1164 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1165 session_info->security_token,
1166 access_mask, NULL);
1167 if (ldb_ret != LDB_SUCCESS) {
1168 state->log(ISC_LOG_INFO,
1169 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1170 signer, name, type, ldb_strerror(ldb_ret));
1171 talloc_free(tmp_ctx);
1172 return false;
1173 }
1174
1175 /* Cache session_info, so it can be used in the actual add/delete operation */
1176 state->update_name = talloc_strdup(state, name);
1177 if (state->update_name == NULL) {
1178 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1179 talloc_free(tmp_ctx);
1180 return false;
1181 }
1182 state->session_info = talloc_steal(state, session_info);
1183
1184 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1185 signer, name, tcpaddr, type, key);
1186
1187 talloc_free(tmp_ctx);
1188 return true;
1189 }
1190
1191
1192 /*
1193 add a new record
1194 */
1195 static isc_result_t b9_add_record(struct dlz_bind9_data *state, const char *name,
1196 struct ldb_dn *dn,
1197 struct dnsp_DnssrvRpcRecord *rec)
1198 {
1199 struct ldb_message *msg;
1200 enum ndr_err_code ndr_err;
1201 struct ldb_val v;
1202 int ret;
1203
1204 msg = ldb_msg_new(rec);
1205 if (msg == NULL) {
1206 return ISC_R_NOMEMORY;
1207 }
1208 msg->dn = dn;
1209 ret = ldb_msg_add_string(msg, "objectClass", "dnsNode");
1210 if (ret != LDB_SUCCESS) {
1211 return ISC_R_FAILURE;
1212 }
1213
1214 ndr_err = ndr_push_struct_blob(&v, rec, rec, (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1215 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1216 return ISC_R_FAILURE;
1217 }
1218 ret = ldb_msg_add_value(msg, "dnsRecord", &v, NULL);
1219 if (ret != LDB_SUCCESS) {
1220 return ISC_R_FAILURE;
1221 }
1222
1223 ret = ldb_add(state->samdb, msg);
1224 if (ret != LDB_SUCCESS) {
1225 return ISC_R_FAILURE;
1226 }
1227
1228 return ISC_R_SUCCESS;
1229 }
1230
1231 /*
1232 see if two DNS names are the same
1233 */
1234 static bool dns_name_equal(const char *name1, const char *name2)
1235 {
1236 size_t len1 = strlen(name1);
1237 size_t len2 = strlen(name2);
1238 if (name1[len1-1] == '.') len1--;
1239 if (name2[len2-1] == '.') len2--;
1240 if (len1 != len2) {
1241 return false;
1242 }
1243 return strncasecmp_m(name1, name2, len1) == 0;
1244 }
1245
1246
1247 /*
1248 see if two dns records match
1249 */
1250 static bool b9_record_match(struct dlz_bind9_data *state,
1251 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1252 {
1253 if (rec1->wType != rec2->wType) {
1254 return false;
1255 }
1256 /* see if this type is single valued */
1257 if (b9_single_valued(rec1->wType)) {
1258 return true;
1259 }
1260
1261 /* see if the data matches */
1262 switch (rec1->wType) {
1263 case DNS_TYPE_A:
1264 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1265 case DNS_TYPE_AAAA:
1266 return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
1267 case DNS_TYPE_CNAME:
1268 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1269 case DNS_TYPE_TXT:
1270 return strcmp(rec1->data.txt, rec2->data.txt) == 0;
1271 case DNS_TYPE_PTR:
1272 return strcmp(rec1->data.ptr, rec2->data.ptr) == 0;
1273 case DNS_TYPE_NS:
1274 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1275
1276 case DNS_TYPE_SRV:
1277 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1278 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1279 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1280 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1281
1282 case DNS_TYPE_MX:
1283 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1284 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1285
1286 case DNS_TYPE_HINFO:
1287 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1288 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1289
1290 case DNS_TYPE_SOA:
1291 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1292 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1293 rec1->data.soa.serial == rec2->data.soa.serial &&
1294 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1295 rec1->data.soa.retry == rec2->data.soa.retry &&
1296 rec1->data.soa.expire == rec2->data.soa.expire &&
1297 rec1->data.soa.minimum == rec2->data.soa.minimum;
1298 default:
1299 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
1300 rec1->wType);
1301 break;
1302 }
1303
1304 return false;
1305 }
1306
1307 /*
1308 * Update session_info on samdb using the cached credentials
1309 */
1310 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1311 {
1312 int ret;
1313
1314 if (state->update_name == NULL || state->session_info == NULL) {
1315 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1316 return false;
1317 }
1318
1319 /* Do not use client credentials, if we not updating the client specified name */
1320 if (strcmp(state->update_name, name) != 0) {
1321 return true;
1322 }
1323
1324 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1325 if (ret != LDB_SUCCESS) {
1326 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1327 return false;
1328 }
1329
1330 return true;
1331 }
1332
1333 /*
1334 * Reset session_info on samdb as system session
1335 */
1336 static void b9_reset_session_info(struct dlz_bind9_data *state)
1337 {
1338 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1339 }
1340
1341 /*
1342 add or modify a rdataset
1343 */
1344 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1345 {
1346 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1347 struct dnsp_DnssrvRpcRecord *rec;
1348 struct ldb_dn *dn;
1349 isc_result_t result;
1350 struct ldb_result *res;
1351 const char *attrs[] = { "dnsRecord", NULL };
1352 int ret, i;
1353 struct ldb_message_element *el;
1354 enum ndr_err_code ndr_err;
1355 NTTIME t;
1356
1357 if (state->transaction_token != (void*)version) {
1358 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1359 return ISC_R_FAILURE;
1360 }
1361
1362 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1363 if (rec == NULL) {
1364 return ISC_R_NOMEMORY;
1365 }
1366
1367 unix_to_nt_time(&t, time(NULL));
1368 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1369 t /= 3600; /* convert to hours */
1370
1371 rec->rank = DNS_RANK_ZONE;
1372 rec->dwSerial = state->soa_serial;
1373 rec->dwTimeStamp = (uint32_t)t;
1374
1375 if (!b9_parse(state, rdatastr, rec)) {
1376 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1377 talloc_free(rec);
1378 return ISC_R_FAILURE;
1379 }
1380
1381 /* find the DN of the record */
1382 result = b9_find_name_dn(state, name, rec, &dn);
1383 if (result != ISC_R_SUCCESS) {
1384 talloc_free(rec);
1385 return result;
1386 }
1387
1388 /* get any existing records */
1389 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1390 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1391 if (!b9_set_session_info(state, name)) {
1392 talloc_free(rec);
1393 return ISC_R_FAILURE;
1394 }
1395 result = b9_add_record(state, name, dn, rec);
1396 b9_reset_session_info(state);
1397 talloc_free(rec);
1398 if (result == ISC_R_SUCCESS) {
1399 state->log(ISC_LOG_ERROR, "samba_dlz: added %s %s", name, rdatastr);
1400 }
1401 return result;
1402 }
1403
1404 /* there are existing records. We need to see if this will
1405 * replace a record or add to it
1406 */
1407 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1408 if (el == NULL) {
1409 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1410 ldb_dn_get_linearized(dn));
1411 talloc_free(rec);
1412 return ISC_R_FAILURE;
1413 }
1414
1415 for (i=0; i<el->num_values; i++) {
1416 struct dnsp_DnssrvRpcRecord rec2;
1417
1418 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1419 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1420 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1421 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1422 ldb_dn_get_linearized(dn));
1423 talloc_free(rec);
1424 return ISC_R_FAILURE;
1425 }
1426
1427 if (b9_record_match(state, rec, &rec2)) {
1428 break;
1429 }
1430 }
1431 if (i == el->num_values) {
1432 /* adding a new value */
1433 el->values = talloc_realloc(el, el->values, struct ldb_val, el->num_values+1);
1434 if (el->values == NULL) {
1435 talloc_free(rec);
1436 return ISC_R_NOMEMORY;
1437 }
1438 el->num_values++;
1439 }
1440
1441 ndr_err = ndr_push_struct_blob(&el->values[i], rec, rec,
1442 (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1443 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1444 state->log(ISC_LOG_ERROR, "samba_dlz: failed to push dnsRecord for %s",
1445 ldb_dn_get_linearized(dn));
1446 talloc_free(rec);
1447 return ISC_R_FAILURE;
1448 }
1449
1450
1451 if (!b9_set_session_info(state, name)) {
1452 talloc_free(rec);
1453 return ISC_R_FAILURE;
1454 }
1455
1456 /* modify the record */
1457 el->flags = LDB_FLAG_MOD_REPLACE;
1458 ret = ldb_modify(state->samdb, res->msgs[0]);
1459 b9_reset_session_info(state);
1460 if (ret != LDB_SUCCESS) {
1461 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1462 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1463 talloc_free(rec);
1464 return ISC_R_FAILURE;
1465 }
1466
1467 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1468
1469 talloc_free(rec);
1470 return ISC_R_SUCCESS;
1471 }
1472
1473 /*
1474 remove a rdataset
1475 */
1476 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1477 {
1478 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1479 struct dnsp_DnssrvRpcRecord *rec;
1480 struct ldb_dn *dn;
1481 isc_result_t result;
1482 struct ldb_result *res;
1483 const char *attrs[] = { "dnsRecord", NULL };
1484 int ret, i;
1485 struct ldb_message_element *el;
1486 enum ndr_err_code ndr_err;
1487
1488 if (state->transaction_token != (void*)version) {
1489 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1490 return ISC_R_FAILURE;
1491 }
1492
1493 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1494 if (rec == NULL) {
1495 return ISC_R_NOMEMORY;
1496 }
1497
1498 if (!b9_parse(state, rdatastr, rec)) {
1499 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1500 talloc_free(rec);
1501 return ISC_R_FAILURE;
1502 }
1503
1504 /* find the DN of the record */
1505 result = b9_find_name_dn(state, name, rec, &dn);
1506 if (result != ISC_R_SUCCESS) {
1507 talloc_free(rec);
1508 return result;
1509 }
1510
1511 /* get the existing records */
1512 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1513 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1514 talloc_free(rec);
1515 return ISC_R_NOTFOUND;
1516 }
1517
1518 /* there are existing records. We need to see if any match
1519 */
1520 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1521 if (el == NULL || el->num_values == 0) {
1522 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1523 ldb_dn_get_linearized(dn));
1524 talloc_free(rec);
1525 return ISC_R_FAILURE;
1526 }
1527
1528 for (i=0; i<el->num_values; i++) {
1529 struct dnsp_DnssrvRpcRecord rec2;
1530
1531 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1532 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1533 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1534 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1535 ldb_dn_get_linearized(dn));
1536 talloc_free(rec);
1537 return ISC_R_FAILURE;
1538 }
1539
1540 if (b9_record_match(state, rec, &rec2)) {
1541 break;
1542 }
1543 }
1544 if (i == el->num_values) {
1545 talloc_free(rec);
1546 return ISC_R_NOTFOUND;
1547 }
1548
1549 if (i < el->num_values-1) {
1550 memmove(&el->values[i], &el->values[i+1], sizeof(el->values[0])*((el->num_values-1)-i));
1551 }
1552 el->num_values--;
1553
1554 if (!b9_set_session_info(state, name)) {
1555 talloc_free(rec);
1556 return ISC_R_FAILURE;
1557 }
1558
1559 if (el->num_values == 0) {
1560 /* delete the record */
1561 ret = ldb_delete(state->samdb, dn);
1562 b9_reset_session_info(state);
1563 } else {
1564 /* modify the record */
1565 el->flags = LDB_FLAG_MOD_REPLACE;
1566 ret = ldb_modify(state->samdb, res->msgs[0]);
1567 }
1568 b9_reset_session_info(state);
1569 if (ret != LDB_SUCCESS) {
1570 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1571 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1572 talloc_free(rec);
1573 return ISC_R_FAILURE;
1574 }
1575
1576 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1577
1578 talloc_free(rec);
1579 return ISC_R_SUCCESS;
1580 }
1581
1582
1583 /*
1584 delete all records of the given type
1585 */
1586 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1587 {
1588 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1589 TALLOC_CTX *tmp_ctx;
1590 struct ldb_dn *dn;
1591 isc_result_t result;
1592 struct ldb_result *res;
1593 const char *attrs[] = { "dnsRecord", NULL };
1594 int ret, i;
1595 struct ldb_message_element *el;
1596 enum ndr_err_code ndr_err;
1597 enum dns_record_type dns_type;
1598 bool found = false;
1599
1600 if (state->transaction_token != (void*)version) {
1601 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1602 return ISC_R_FAILURE;
1603 }
1604
1605 if (!b9_dns_type(type, &dns_type)) {
1606 state->log(ISC_LOG_INFO, "samba_dlz: bad dns type %s in delete", type);
1607 return ISC_R_FAILURE;
1608 }
1609
1610 tmp_ctx = talloc_new(state);
1611
1612 /* find the DN of the record */
1613 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1614 if (result != ISC_R_SUCCESS) {
1615 talloc_free(tmp_ctx);
1616 return result;
1617 }
1618
1619 /* get the existing records */
1620 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1621 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1622 talloc_free(tmp_ctx);
1623 return ISC_R_NOTFOUND;
1624 }
1625
1626 /* there are existing records. We need to see if any match the type
1627 */
1628 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1629 if (el == NULL || el->num_values == 0) {
1630 talloc_free(tmp_ctx);
1631 return ISC_R_NOTFOUND;
1632 }
1633
1634 for (i=0; i<el->num_values; i++) {
1635 struct dnsp_DnssrvRpcRecord rec2;
1636
1637 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec2,
1638 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1639 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1640 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1641 ldb_dn_get_linearized(dn));
1642 talloc_free(tmp_ctx);
1643 return ISC_R_FAILURE;
1644 }
1645
1646 if (dns_type == rec2.wType) {
1647 if (i < el->num_values-1) {
1648 memmove(&el->values[i], &el->values[i+1],
1649 sizeof(el->values[0])*((el->num_values-1)-i));
1650 }
1651 el->num_values--;
1652 i--;
1653 found = true;
1654 }
1655 }
1656
1657 if (!found) {
1658 talloc_free(tmp_ctx);
1659 return ISC_R_FAILURE;
1660 }
1661
1662 if (!b9_set_session_info(state, name)) {
1663 talloc_free(tmp_ctx);
1664 return ISC_R_FAILURE;
1665 }
1666
1667 if (el->num_values == 0) {
1668 /* delete the record */
1669 ret = ldb_delete(state->samdb, dn);
1670 } else {
1671 /* modify the record */
1672 el->flags = LDB_FLAG_MOD_REPLACE;
1673 ret = ldb_modify(state->samdb, res->msgs[0]);
1674 }
1675 b9_reset_session_info(state);
1676 if (ret != LDB_SUCCESS) {
1677 state->log(ISC_LOG_ERROR, "samba_dlz: failed to delete type %s in %s - %s",
1678 type, ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1679 talloc_free(tmp_ctx);
1680 return ISC_R_FAILURE;
1681 }
1682
1683 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1684
1685 talloc_free(tmp_ctx);
1686 return ISC_R_SUCCESS;
1687 }
reg import