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lib/debug: retain full string in state.prog_name global
[Samba.git] / source4 / dns_server / dlz_bind9.c
blob82c72111a007b59f9ad8e2855fca72ec07fd0d22
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 <popt.h>
39 #include "lib/util/dlinklist.h"
40 #include "dlz_minimal.h"
41 #include "dnsserver_common.h"
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 * Add a trailing '.' if it's missing
114 */
115 static const char *b9_format_fqdn(TALLOC_CTX *mem_ctx, const char *str)
116 {
117 size_t len;
118 const char *tmp;
119
120 if (str == NULL || str[0] == '\0') {
121 return str;
122 }
123
124 len = strlen(str);
125 if (str[len-1] != '.') {
126 tmp = talloc_asprintf(mem_ctx, "%s.", str);
127 } else {
128 tmp = str;
129 }
130 return tmp;
131 }
132
133 /*
134 format a record for bind9
135 */
136 static bool b9_format(struct dlz_bind9_data *state,
137 TALLOC_CTX *mem_ctx,
138 struct dnsp_DnssrvRpcRecord *rec,
139 const char **type, const char **data)
140 {
141 uint32_t i;
142 char *tmp;
143 const char *fqdn;
144
145 switch (rec->wType) {
146 case DNS_TYPE_A:
147 *type = "a";
148 *data = rec->data.ipv4;
149 break;
150
151 case DNS_TYPE_AAAA:
152 *type = "aaaa";
153 *data = rec->data.ipv6;
154 break;
155
156 case DNS_TYPE_CNAME:
157 *type = "cname";
158 *data = b9_format_fqdn(mem_ctx, rec->data.cname);
159 break;
160
161 case DNS_TYPE_TXT:
162 *type = "txt";
163 tmp = talloc_asprintf(mem_ctx, "\"%s\"", rec->data.txt.str[0]);
164 for (i=1; i<rec->data.txt.count; i++) {
165 tmp = talloc_asprintf_append(tmp, " \"%s\"", rec->data.txt.str[i]);
166 }
167 *data = tmp;
168 break;
169
170 case DNS_TYPE_PTR:
171 *type = "ptr";
172 *data = b9_format_fqdn(mem_ctx, rec->data.ptr);
173 break;
174
175 case DNS_TYPE_SRV:
176 *type = "srv";
177 fqdn = b9_format_fqdn(mem_ctx, rec->data.srv.nameTarget);
178 if (fqdn == NULL) {
179 return false;
180 }
181 *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
182 rec->data.srv.wPriority,
183 rec->data.srv.wWeight,
184 rec->data.srv.wPort,
185 fqdn);
186 break;
187
188 case DNS_TYPE_MX:
189 *type = "mx";
190 fqdn = b9_format_fqdn(mem_ctx, rec->data.mx.nameTarget);
191 if (fqdn == NULL) {
192 return false;
193 }
194 *data = talloc_asprintf(mem_ctx, "%u %s",
195 rec->data.mx.wPriority, fqdn);
196 break;
197
198 case DNS_TYPE_HINFO:
199 *type = "hinfo";
200 *data = talloc_asprintf(mem_ctx, "%s %s",
201 rec->data.hinfo.cpu,
202 rec->data.hinfo.os);
203 break;
204
205 case DNS_TYPE_NS:
206 *type = "ns";
207 *data = b9_format_fqdn(mem_ctx, rec->data.ns);
208 break;
209
210 case DNS_TYPE_SOA: {
211 const char *mname;
212 *type = "soa";
213
214 /* we need to fake the authoritative nameserver to
215 * point at ourselves. This is how AD DNS servers
216 * force clients to send updates to the right local DC
217 */
218 mname = talloc_asprintf(mem_ctx, "%s.%s.",
219 lpcfg_netbios_name(state->lp),
220 lpcfg_dnsdomain(state->lp));
221 if (mname == NULL) {
222 return false;
223 }
224 mname = strlower_talloc(mem_ctx, mname);
225 if (mname == NULL) {
226 return false;
227 }
228
229 fqdn = b9_format_fqdn(mem_ctx, rec->data.soa.rname);
230 if (fqdn == NULL) {
231 return false;
232 }
233
234 state->soa_serial = rec->data.soa.serial;
235
236 *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
237 mname, fqdn,
238 rec->data.soa.serial,
239 rec->data.soa.refresh,
240 rec->data.soa.retry,
241 rec->data.soa.expire,
242 rec->data.soa.minimum);
243 break;
244 }
245
246 default:
247 state->log(ISC_LOG_ERROR, "samba_dlz b9_format: unhandled record type %u",
248 rec->wType);
249 return false;
250 }
251
252 return true;
253 }
254
255 static const struct {
256 enum dns_record_type dns_type;
257 const char *typestr;
258 bool single_valued;
259 } dns_typemap[] = {
260 { DNS_TYPE_A, "A" , false},
261 { DNS_TYPE_AAAA, "AAAA" , false},
262 { DNS_TYPE_CNAME, "CNAME" , true},
263 { DNS_TYPE_TXT, "TXT" , false},
264 { DNS_TYPE_PTR, "PTR" , false},
265 { DNS_TYPE_SRV, "SRV" , false},
266 { DNS_TYPE_MX, "MX" , false},
267 { DNS_TYPE_HINFO, "HINFO" , false},
268 { DNS_TYPE_NS, "NS" , false},
269 { DNS_TYPE_SOA, "SOA" , true},
270 };
271
272
273 /*
274 see if a DNS type is single valued
275 */
276 static bool b9_single_valued(enum dns_record_type dns_type)
277 {
278 int i;
279 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
280 if (dns_typemap[i].dns_type == dns_type) {
281 return dns_typemap[i].single_valued;
282 }
283 }
284 return false;
285 }
286
287 /*
288 see if a DNS type is single valued
289 */
290 static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
291 {
292 int i;
293 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
294 if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
295 *dtype = dns_typemap[i].dns_type;
296 return true;
297 }
298 }
299 return false;
300 }
301
302
303 #define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
304 (ret) = strtok_r(str, sep, &saveptr); \
305 if ((ret) == NULL) return false; \
306 } while (0)
307
308 #define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
309 char *istr = strtok_r(str, sep, &saveptr); \
310 if ((istr) == NULL) return false; \
311 (ret) = strtoul(istr, NULL, 10); \
312 } while (0)
313
314 /*
315 parse a record from bind9
316 */
317 static bool b9_parse(struct dlz_bind9_data *state,
318 const char *rdatastr,
319 struct dnsp_DnssrvRpcRecord *rec)
320 {
321 char *full_name, *dclass, *type;
322 char *str, *tmp, *saveptr=NULL;
323 int i;
324
325 str = talloc_strdup(rec, rdatastr);
326 if (str == NULL) {
327 return false;
328 }
329
330 /* parse the SDLZ string form */
331 DNS_PARSE_STR(full_name, str, "\t", saveptr);
332 DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
333 DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
334 DNS_PARSE_STR(type, NULL, "\t", saveptr);
335
336 /* construct the record */
337 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
338 if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
339 rec->wType = dns_typemap[i].dns_type;
340 break;
341 }
342 }
343 if (i == ARRAY_SIZE(dns_typemap)) {
344 state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
345 type, full_name);
346 return false;
347 }
348
349 switch (rec->wType) {
350 case DNS_TYPE_A:
351 DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
352 break;
353
354 case DNS_TYPE_AAAA:
355 DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
356 break;
357
358 case DNS_TYPE_CNAME:
359 DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
360 break;
361
362 case DNS_TYPE_TXT:
363 rec->data.txt.count = 0;
364 rec->data.txt.str = talloc_array(rec, const char *, rec->data.txt.count);
365 tmp = strtok_r(NULL, "\t", &saveptr);
366 while (tmp) {
367 rec->data.txt.str = talloc_realloc(rec, rec->data.txt.str, const char *,
368 rec->data.txt.count+1);
369 if (tmp[0] == '"') {
370 /* Strip quotes */
371 rec->data.txt.str[rec->data.txt.count] = talloc_strndup(rec, &tmp[1], strlen(tmp)-2);
372 } else {
373 rec->data.txt.str[rec->data.txt.count] = talloc_strdup(rec, tmp);
374 }
375 rec->data.txt.count++;
376 tmp = strtok_r(NULL, " ", &saveptr);
377 }
378 break;
379
380 case DNS_TYPE_PTR:
381 DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
382 break;
383
384 case DNS_TYPE_SRV:
385 DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
386 DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
387 DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
388 DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
389 break;
390
391 case DNS_TYPE_MX:
392 DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
393 DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
394 break;
395
396 case DNS_TYPE_HINFO:
397 DNS_PARSE_STR(rec->data.hinfo.cpu, NULL, " ", saveptr);
398 DNS_PARSE_STR(rec->data.hinfo.os, NULL, " ", saveptr);
399 break;
400
401 case DNS_TYPE_NS:
402 DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
403 break;
404
405 case DNS_TYPE_SOA:
406 DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
407 DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
408 DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
409 DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
410 DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
411 DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
412 DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
413 break;
414
415 default:
416 state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unhandled record type %u",
417 rec->wType);
418 return false;
419 }
420
421 /* we should be at the end of the buffer now */
422 if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
423 state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unexpected data at end of string for '%s'",
424 rdatastr);
425 return false;
426 }
427
428 return true;
429 }
430
431 /*
432 send a resource record to bind9
433 */
434 static isc_result_t b9_putrr(struct dlz_bind9_data *state,
435 void *handle, struct dnsp_DnssrvRpcRecord *rec,
436 const char **types)
437 {
438 isc_result_t result;
439 const char *type, *data;
440 TALLOC_CTX *tmp_ctx = talloc_new(state);
441
442 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
443 return ISC_R_FAILURE;
444 }
445
446 if (data == NULL) {
447 talloc_free(tmp_ctx);
448 return ISC_R_NOMEMORY;
449 }
450
451 if (types) {
452 int i;
453 for (i=0; types[i]; i++) {
454 if (strcmp(types[i], type) == 0) break;
455 }
456 if (types[i] == NULL) {
457 /* skip it */
458 return ISC_R_SUCCESS;
459 }
460 }
461
462 result = state->putrr(handle, type, rec->dwTtlSeconds, data);
463 if (result != ISC_R_SUCCESS) {
464 state->log(ISC_LOG_ERROR, "Failed to put rr");
465 }
466 talloc_free(tmp_ctx);
467 return result;
468 }
469
470
471 /*
472 send a named resource record to bind9
473 */
474 static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
475 void *handle, const char *name,
476 struct dnsp_DnssrvRpcRecord *rec)
477 {
478 isc_result_t result;
479 const char *type, *data;
480 TALLOC_CTX *tmp_ctx = talloc_new(state);
481
482 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
483 return ISC_R_FAILURE;
484 }
485
486 if (data == NULL) {
487 talloc_free(tmp_ctx);
488 return ISC_R_NOMEMORY;
489 }
490
491 result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
492 if (result != ISC_R_SUCCESS) {
493 state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
494 }
495 talloc_free(tmp_ctx);
496 return result;
497 }
498
499 /*
500 parse options
501 */
502 static isc_result_t parse_options(struct dlz_bind9_data *state,
503 unsigned int argc, const char **argv,
504 struct b9_options *options)
505 {
506 int opt;
507 poptContext pc;
508 struct poptOption long_options[] = {
509 { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
510 { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
511 { NULL }
512 };
513
514 pc = poptGetContext("dlz_bind9", argc, argv, long_options,
515 POPT_CONTEXT_KEEP_FIRST);
516 while ((opt = poptGetNextOpt(pc)) != -1) {
517 switch (opt) {
518 default:
519 state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
520 poptBadOption(pc, 0), poptStrerror(opt));
521 return ISC_R_FAILURE;
522 }
523 }
524
525 return ISC_R_SUCCESS;
526 }
527
528
529 /*
530 * Create session info from PAC
531 * This is called as auth_context->generate_session_info_pac()
532 */
533 static NTSTATUS b9_generate_session_info_pac(struct auth4_context *auth_context,
534 TALLOC_CTX *mem_ctx,
535 struct smb_krb5_context *smb_krb5_context,
536 DATA_BLOB *pac_blob,
537 const char *principal_name,
538 const struct tsocket_address *remote_addr,
539 uint32_t session_info_flags,
540 struct auth_session_info **session_info)
541 {
542 NTSTATUS status;
543 struct auth_user_info_dc *user_info_dc;
544 TALLOC_CTX *tmp_ctx;
545
546 tmp_ctx = talloc_new(mem_ctx);
547 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
548
549 status = kerberos_pac_blob_to_user_info_dc(tmp_ctx,
550 *pac_blob,
551 smb_krb5_context->krb5_context,
552 &user_info_dc,
553 NULL,
554 NULL);
555 if (!NT_STATUS_IS_OK(status)) {
556 talloc_free(tmp_ctx);
557 return status;
558 }
559
560 if (user_info_dc->info->authenticated) {
561 session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
562 }
563
564 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
565
566 status = auth_generate_session_info(mem_ctx, NULL, NULL, user_info_dc,
567 session_info_flags, session_info);
568 if (!NT_STATUS_IS_OK(status)) {
569 talloc_free(tmp_ctx);
570 return status;
571 }
572
573 talloc_free(tmp_ctx);
574 return status;
575 }
576
577 /* Callback for the DEBUG() system, to catch the remaining messages */
578 static void b9_debug(void *private_ptr, int msg_level, const char *msg)
579 {
580 static const int isc_log_map[] = {
581 ISC_LOG_CRITICAL, /* 0 */
582 ISC_LOG_ERROR, /* 1 */
583 ISC_LOG_WARNING, /* 2 */
584 ISC_LOG_NOTICE /* 3 */
585 };
586 struct dlz_bind9_data *state = private_ptr;
587 int isc_log_level;
588
589 if (msg_level >= ARRAY_SIZE(isc_log_map) || msg_level < 0) {
590 isc_log_level = ISC_LOG_INFO;
591 } else {
592 isc_log_level = isc_log_map[msg_level];
593 }
594 state->log(isc_log_level, "samba_dlz: %s", msg);
595 }
596
597 static int dlz_state_debug_unregister(struct dlz_bind9_data *state)
598 {
599 /* Stop logging (to the bind9 logs) */
600 debug_set_callback(NULL, NULL);
601 return 0;
602 }
603
604 /*
605 called to initialise the driver
606 */
607 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
608 unsigned int argc, const char **argv,
609 void **dbdata, ...)
610 {
611 struct dlz_bind9_data *state;
612 const char *helper_name;
613 va_list ap;
614 isc_result_t result;
615 struct ldb_dn *dn;
616 NTSTATUS nt_status;
617 int ret;
618 char *errstring = NULL;
619
620 if (dlz_bind9_state != NULL) {
621 dlz_bind9_state->log(ISC_LOG_ERROR,
622 "samba_dlz: dlz_create ignored, #refs=%d",
623 dlz_bind9_state_ref_count);
624 *dbdata = dlz_bind9_state;
625 dlz_bind9_state_ref_count++;
626 return ISC_R_SUCCESS;
627 }
628
629 state = talloc_zero(NULL, struct dlz_bind9_data);
630 if (state == NULL) {
631 return ISC_R_NOMEMORY;
632 }
633
634 talloc_set_destructor(state, dlz_state_debug_unregister);
635
636 /* fill in the helper functions */
637 va_start(ap, dbdata);
638 while ((helper_name = va_arg(ap, const char *)) != NULL) {
639 b9_add_helper(state, helper_name, va_arg(ap, void*));
640 }
641 va_end(ap);
642
643 /* Do not install samba signal handlers */
644 fault_setup_disable();
645
646 /* Start logging (to the bind9 logs) */
647 debug_set_callback(state, b9_debug);
648
649 state->ev_ctx = s4_event_context_init(state);
650 if (state->ev_ctx == NULL) {
651 result = ISC_R_NOMEMORY;
652 goto failed;
653 }
654
655 result = parse_options(state, argc, argv, &state->options);
656 if (result != ISC_R_SUCCESS) {
657 goto failed;
658 }
659
660 state->lp = loadparm_init_global(true);
661 if (state->lp == NULL) {
662 result = ISC_R_NOMEMORY;
663 goto failed;
664 }
665
666 if (state->options.debug) {
667 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
668 } else {
669 lpcfg_do_global_parameter(state->lp, "log level", "0");
670 }
671
672 if (smb_krb5_init_context(state, state->lp, &state->smb_krb5_ctx) != 0) {
673 result = ISC_R_NOMEMORY;
674 goto failed;
675 }
676
677 nt_status = gensec_init();
678 if (!NT_STATUS_IS_OK(nt_status)) {
679 result = ISC_R_NOMEMORY;
680 goto failed;
681 }
682
683 state->auth_context = talloc_zero(state, struct auth4_context);
684 if (state->auth_context == NULL) {
685 result = ISC_R_NOMEMORY;
686 goto failed;
687 }
688
689 if (state->options.url == NULL) {
690 state->options.url = talloc_asprintf(state,
691 "%s/dns/sam.ldb",
692 lpcfg_binddns_dir(state->lp));
693 if (state->options.url == NULL) {
694 result = ISC_R_NOMEMORY;
695 goto failed;
696 }
697
698 if (!file_exist(state->options.url)) {
699 state->options.url = talloc_asprintf(state,
700 "%s/dns/sam.ldb",
701 lpcfg_private_dir(state->lp));
702 if (state->options.url == NULL) {
703 result = ISC_R_NOMEMORY;
704 goto failed;
705 }
706 }
707 }
708
709 ret = samdb_connect_url(state,
710 state->ev_ctx,
711 state->lp,
712 system_session(state->lp),
713 0,
714 state->options.url,
715 NULL,
716 &state->samdb,
717 &errstring);
718 if (ret != LDB_SUCCESS) {
719 state->log(ISC_LOG_ERROR,
720 "samba_dlz: Failed to connect to %s: %s",
721 errstring, ldb_strerror(ret));
722 result = ISC_R_FAILURE;
723 goto failed;
724 }
725
726 dn = ldb_get_default_basedn(state->samdb);
727 if (dn == NULL) {
728 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
729 state->options.url, ldb_errstring(state->samdb));
730 result = ISC_R_FAILURE;
731 goto failed;
732 }
733
734 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
735 ldb_dn_get_linearized(dn));
736
737 state->auth_context->event_ctx = state->ev_ctx;
738 state->auth_context->lp_ctx = state->lp;
739 state->auth_context->sam_ctx = state->samdb;
740 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
741
742 *dbdata = state;
743 dlz_bind9_state = state;
744 dlz_bind9_state_ref_count++;
745
746 return ISC_R_SUCCESS;
747
748 failed:
749 state->log(ISC_LOG_INFO,
750 "samba_dlz: FAILED dlz_create call result=%d #refs=%d",
751 result,
752 dlz_bind9_state_ref_count);
753 talloc_free(state);
754 return result;
755 }
756
757 /*
758 shutdown the backend
759 */
760 _PUBLIC_ void dlz_destroy(void *dbdata)
761 {
762 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
763
764 dlz_bind9_state_ref_count--;
765 if (dlz_bind9_state_ref_count == 0) {
766 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
767 talloc_unlink(state, state->samdb);
768 talloc_free(state);
769 dlz_bind9_state = NULL;
770 } else {
771 state->log(ISC_LOG_INFO,
772 "samba_dlz: dlz_destroy called. %d refs remaining.",
773 dlz_bind9_state_ref_count);
774 }
775 }
776
777
778 /*
779 return the base DN for a zone
780 */
781 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
782 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
783 {
784 int ret;
785 TALLOC_CTX *tmp_ctx = talloc_new(state);
786 const char *attrs[] = { NULL };
787 int i;
788
789 for (i=0; zone_prefixes[i]; i++) {
790 const char *casefold;
791 struct ldb_dn *dn;
792 struct ldb_result *res;
793 struct ldb_val zone_name_val
794 = data_blob_string_const(zone_name);
795
796 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
797 if (dn == NULL) {
798 talloc_free(tmp_ctx);
799 return ISC_R_NOMEMORY;
800 }
801
802 /*
803 * This dance ensures that it is not possible to put
804 * (eg) an extra DC=x, into the DNS name being
805 * queried
806 */
807
808 if (!ldb_dn_add_child_fmt(dn,
809 "DC=X,%s",
810 zone_prefixes[i])) {
811 talloc_free(tmp_ctx);
812 return ISC_R_NOMEMORY;
813 }
814
815 ret = ldb_dn_set_component(dn,
816 0,
817 "DC",
818 zone_name_val);
819 if (ret != LDB_SUCCESS) {
820 talloc_free(tmp_ctx);
821 return ISC_R_NOMEMORY;
822 }
823
824 /*
825 * Check if this is a plausibly valid DN early
826 * (time spent here will be saved during the
827 * search due to an internal cache)
828 */
829 casefold = ldb_dn_get_casefold(dn);
830
831 if (casefold == NULL) {
832 talloc_free(tmp_ctx);
833 return ISC_R_NOTFOUND;
834 }
835
836 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
837 if (ret == LDB_SUCCESS) {
838 if (zone_dn != NULL) {
839 *zone_dn = talloc_steal(mem_ctx, dn);
840 }
841 talloc_free(tmp_ctx);
842 return ISC_R_SUCCESS;
843 }
844 talloc_free(dn);
845 }
846
847 talloc_free(tmp_ctx);
848 return ISC_R_NOTFOUND;
849 }
850
851
852 /*
853 return the DN for a name. The record does not need to exist, but the
854 zone must exist
855 */
856 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
857 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
858 {
859 const char *p;
860
861 /* work through the name piece by piece, until we find a zone */
862 for (p=name; p; ) {
863 isc_result_t result;
864 result = b9_find_zone_dn(state, p, mem_ctx, dn);
865 if (result == ISC_R_SUCCESS) {
866 const char *casefold;
867
868 /* we found a zone, now extend the DN to get
869 * the full DN
870 */
871 bool ret;
872 if (p == name) {
873 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
874 if (ret == false) {
875 talloc_free(*dn);
876 return ISC_R_NOMEMORY;
877 }
878 } else {
879 struct ldb_val name_val
880 = data_blob_const(name,
881 (int)(p-name)-1);
882
883 if (!ldb_dn_add_child_val(*dn,
884 "DC",
885 name_val)) {
886 talloc_free(*dn);
887 return ISC_R_NOMEMORY;
888 }
889 }
890
891 /*
892 * Check if this is a plausibly valid DN early
893 * (time spent here will be saved during the
894 * search due to an internal cache)
895 */
896 casefold = ldb_dn_get_casefold(*dn);
897
898 if (casefold == NULL) {
899 return ISC_R_NOTFOUND;
900 }
901
902 return ISC_R_SUCCESS;
903 }
904 p = strchr(p, '.');
905 if (p == NULL) {
906 break;
907 }
908 p++;
909 }
910 return ISC_R_NOTFOUND;
911 }
912
913
914 /*
915 see if we handle a given zone
916 */
917 #if DLZ_DLOPEN_VERSION < 3
918 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
919 #else
920 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name,
921 dns_clientinfomethods_t *methods,
922 dns_clientinfo_t *clientinfo)
923 #endif
924 {
925 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
926 return b9_find_zone_dn(state, name, NULL, NULL);
927 }
928
929
930 /*
931 lookup one record
932 */
933 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
934 const char *zone, const char *name,
935 dns_sdlzlookup_t *lookup,
936 const char **types)
937 {
938 TALLOC_CTX *tmp_ctx = talloc_new(state);
939 struct ldb_dn *dn;
940 WERROR werr = WERR_DNS_ERROR_NAME_DOES_NOT_EXIST;
941 struct dnsp_DnssrvRpcRecord *records = NULL;
942 uint16_t num_records = 0, i;
943 struct ldb_val zone_name_val
944 = data_blob_string_const(zone);
945 struct ldb_val name_val
946 = data_blob_string_const(name);
947
948 for (i=0; zone_prefixes[i]; i++) {
949 int ret;
950 const char *casefold;
951 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
952 if (dn == NULL) {
953 talloc_free(tmp_ctx);
954 return ISC_R_NOMEMORY;
955 }
956
957 /*
958 * This dance ensures that it is not possible to put
959 * (eg) an extra DC=x, into the DNS name being
960 * queried
961 */
962
963 if (!ldb_dn_add_child_fmt(dn,
964 "DC=X,DC=X,%s",
965 zone_prefixes[i])) {
966 talloc_free(tmp_ctx);
967 return ISC_R_NOMEMORY;
968 }
969
970 ret = ldb_dn_set_component(dn,
971 1,
972 "DC",
973 zone_name_val);
974 if (ret != LDB_SUCCESS) {
975 talloc_free(tmp_ctx);
976 return ISC_R_NOMEMORY;
977 }
978
979 ret = ldb_dn_set_component(dn,
980 0,
981 "DC",
982 name_val);
983 if (ret != LDB_SUCCESS) {
984 talloc_free(tmp_ctx);
985 return ISC_R_NOMEMORY;
986 }
987
988 /*
989 * Check if this is a plausibly valid DN early
990 * (time spent here will be saved during the
991 * search due to an internal cache)
992 */
993 casefold = ldb_dn_get_casefold(dn);
994
995 if (casefold == NULL) {
996 talloc_free(tmp_ctx);
997 return ISC_R_NOTFOUND;
998 }
999
1000 werr = dns_common_wildcard_lookup(state->samdb, tmp_ctx, dn,
1001 &records, &num_records);
1002 if (W_ERROR_IS_OK(werr)) {
1003 break;
1004 }
1005 }
1006 if (!W_ERROR_IS_OK(werr)) {
1007 talloc_free(tmp_ctx);
1008 return ISC_R_NOTFOUND;
1009 }
1010
1011 for (i=0; i < num_records; i++) {
1012 isc_result_t result;
1013
1014 result = b9_putrr(state, lookup, &records[i], types);
1015 if (result != ISC_R_SUCCESS) {
1016 talloc_free(tmp_ctx);
1017 return result;
1018 }
1019 }
1020
1021 talloc_free(tmp_ctx);
1022 return ISC_R_SUCCESS;
1023 }
1024
1025 /*
1026 lookup one record
1027 */
1028 #if DLZ_DLOPEN_VERSION == 1
1029 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
1030 void *dbdata, dns_sdlzlookup_t *lookup)
1031 #else
1032 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
1033 void *dbdata, dns_sdlzlookup_t *lookup,
1034 dns_clientinfomethods_t *methods,
1035 dns_clientinfo_t *clientinfo)
1036 #endif
1037 {
1038 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1039 return dlz_lookup_types(state, zone, name, lookup, NULL);
1040 }
1041
1042
1043 /*
1044 see if a zone transfer is allowed
1045 */
1046 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
1047 {
1048 /* just say yes for all our zones for now */
1049 struct dlz_bind9_data *state = talloc_get_type(
1050 dbdata, struct dlz_bind9_data);
1051 return b9_find_zone_dn(state, name, NULL, NULL);
1052 }
1053
1054 /*
1055 perform a zone transfer
1056 */
1057 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
1058 dns_sdlzallnodes_t *allnodes)
1059 {
1060 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1061 const char *attrs[] = { "dnsRecord", NULL };
1062 int ret = LDB_ERR_NO_SUCH_OBJECT;
1063 size_t i, j;
1064 struct ldb_dn *dn = NULL;
1065 struct ldb_result *res;
1066 TALLOC_CTX *tmp_ctx = talloc_new(state);
1067 struct ldb_val zone_name_val = data_blob_string_const(zone);
1068
1069 for (i=0; zone_prefixes[i]; i++) {
1070 const char *casefold;
1071
1072 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1073 if (dn == NULL) {
1074 talloc_free(tmp_ctx);
1075 return ISC_R_NOMEMORY;
1076 }
1077
1078 /*
1079 * This dance ensures that it is not possible to put
1080 * (eg) an extra DC=x, into the DNS name being
1081 * queried
1082 */
1083
1084 if (!ldb_dn_add_child_fmt(dn,
1085 "DC=X,%s",
1086 zone_prefixes[i])) {
1087 talloc_free(tmp_ctx);
1088 return ISC_R_NOMEMORY;
1089 }
1090
1091 ret = ldb_dn_set_component(dn,
1092 0,
1093 "DC",
1094 zone_name_val);
1095 if (ret != LDB_SUCCESS) {
1096 talloc_free(tmp_ctx);
1097 return ISC_R_NOMEMORY;
1098 }
1099
1100 /*
1101 * Check if this is a plausibly valid DN early
1102 * (time spent here will be saved during the
1103 * search due to an internal cache)
1104 */
1105 casefold = ldb_dn_get_casefold(dn);
1106
1107 if (casefold == NULL) {
1108 return ISC_R_NOTFOUND;
1109 }
1110
1111 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1112 attrs, "objectClass=dnsNode");
1113 if (ret == LDB_SUCCESS) {
1114 break;
1115 }
1116 }
1117 if (ret != LDB_SUCCESS || dn == NULL) {
1118 talloc_free(tmp_ctx);
1119 return ISC_R_NOTFOUND;
1120 }
1121
1122 for (i=0; i<res->count; i++) {
1123 struct ldb_message_element *el;
1124 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
1125 const char *rdn, *name;
1126 const struct ldb_val *v;
1127 WERROR werr;
1128 struct dnsp_DnssrvRpcRecord *recs = NULL;
1129 uint16_t num_recs = 0;
1130
1131 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
1132 if (el == NULL || el->num_values == 0) {
1133 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
1134 ldb_dn_get_linearized(dn));
1135 talloc_free(el_ctx);
1136 continue;
1137 }
1138
1139 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
1140 if (v == NULL) {
1141 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
1142 ldb_dn_get_linearized(dn));
1143 talloc_free(el_ctx);
1144 continue;
1145 }
1146
1147 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
1148 if (rdn == NULL) {
1149 talloc_free(tmp_ctx);
1150 return ISC_R_NOMEMORY;
1151 }
1152
1153 if (strcmp(rdn, "@") == 0) {
1154 name = zone;
1155 } else {
1156 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
1157 }
1158 name = b9_format_fqdn(el_ctx, name);
1159 if (name == NULL) {
1160 talloc_free(tmp_ctx);
1161 return ISC_R_NOMEMORY;
1162 }
1163
1164 werr = dns_common_extract(state->samdb, el, el_ctx, &recs, &num_recs);
1165 if (!W_ERROR_IS_OK(werr)) {
1166 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
1167 ldb_dn_get_linearized(dn), win_errstr(werr));
1168 talloc_free(el_ctx);
1169 continue;
1170 }
1171
1172 for (j=0; j < num_recs; j++) {
1173 isc_result_t result;
1174
1175 result = b9_putnamedrr(state, allnodes, name, &recs[j]);
1176 if (result != ISC_R_SUCCESS) {
1177 continue;
1178 }
1179 }
1180
1181 talloc_free(el_ctx);
1182 }
1183
1184 talloc_free(tmp_ctx);
1185
1186 return ISC_R_SUCCESS;
1187 }
1188
1189
1190 /*
1191 start a transaction
1192 */
1193 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
1194 {
1195 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1196
1197 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
1198
1199 if (state->transaction_token != NULL) {
1200 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
1201 return ISC_R_FAILURE;
1202 }
1203
1204 state->transaction_token = talloc_zero(state, int);
1205 if (state->transaction_token == NULL) {
1206 return ISC_R_NOMEMORY;
1207 }
1208
1209 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
1210 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
1211 talloc_free(state->transaction_token);
1212 state->transaction_token = NULL;
1213 return ISC_R_FAILURE;
1214 }
1215
1216 *versionp = (void *)state->transaction_token;
1217
1218 return ISC_R_SUCCESS;
1219 }
1220
1221 /*
1222 end a transaction
1223 */
1224 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1225 void *dbdata, void **versionp)
1226 {
1227 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1228
1229 if (state->transaction_token != (int *)*versionp) {
1230 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1231 return;
1232 }
1233
1234 if (commit) {
1235 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1236 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1237 return;
1238 }
1239 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1240 } else {
1241 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1242 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1243 return;
1244 }
1245 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1246 }
1247
1248 talloc_free(state->transaction_token);
1249 state->transaction_token = NULL;
1250 *versionp = NULL;
1251 }
1252
1253
1254 /*
1255 see if there is a SOA record for a zone
1256 */
1257 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1258 {
1259 TALLOC_CTX *tmp_ctx = talloc_new(state);
1260 WERROR werr;
1261 struct dnsp_DnssrvRpcRecord *records = NULL;
1262 uint16_t num_records = 0, i;
1263 struct ldb_val zone_name_val
1264 = data_blob_string_const(zone);
1265
1266 /*
1267 * This dance ensures that it is not possible to put
1268 * (eg) an extra DC=x, into the DNS name being
1269 * queried
1270 */
1271
1272 if (!ldb_dn_add_child_val(dn,
1273 "DC",
1274 zone_name_val)) {
1275 talloc_free(tmp_ctx);
1276 return false;
1277 }
1278
1279 werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
1280 &records, &num_records, NULL);
1281 if (!W_ERROR_IS_OK(werr)) {
1282 talloc_free(tmp_ctx);
1283 return false;
1284 }
1285
1286 for (i=0; i < num_records; i++) {
1287 if (records[i].wType == DNS_TYPE_SOA) {
1288 talloc_free(tmp_ctx);
1289 return true;
1290 }
1291 }
1292
1293 talloc_free(tmp_ctx);
1294 return false;
1295 }
1296
1297 static bool b9_zone_add(struct dlz_bind9_data *state, const char *name)
1298 {
1299 struct b9_zone *zone;
1300
1301 zone = talloc_zero(state, struct b9_zone);
1302 if (zone == NULL) {
1303 return false;
1304 }
1305
1306 zone->name = talloc_strdup(zone, name);
1307 if (zone->name == NULL) {
1308 talloc_free(zone);
1309 return false;
1310 }
1311
1312 DLIST_ADD(state->zonelist, zone);
1313 return true;
1314 }
1315
1316 static bool b9_zone_exists(struct dlz_bind9_data *state, const char *name)
1317 {
1318 struct b9_zone *zone = state->zonelist;
1319 bool found = false;
1320
1321 while (zone != NULL) {
1322 if (strcasecmp(name, zone->name) == 0) {
1323 found = true;
1324 break;
1325 }
1326 zone = zone->next;
1327 }
1328
1329 return found;
1330 }
1331
1332
1333 /*
1334 configure a writeable zone
1335 */
1336 #if DLZ_DLOPEN_VERSION < 3
1337 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1338 #else
1339 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, dns_dlzdb_t *dlzdb,
1340 void *dbdata)
1341 #endif
1342 {
1343 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1344 TALLOC_CTX *tmp_ctx;
1345 struct ldb_dn *dn;
1346 int i;
1347
1348 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1349 if (state->writeable_zone == NULL) {
1350 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1351 return ISC_R_FAILURE;
1352 }
1353
1354 tmp_ctx = talloc_new(state);
1355
1356 for (i=0; zone_prefixes[i]; i++) {
1357 const char *attrs[] = { "name", NULL };
1358 int j, ret;
1359 struct ldb_result *res;
1360
1361 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1362 if (dn == NULL) {
1363 talloc_free(tmp_ctx);
1364 return ISC_R_NOMEMORY;
1365 }
1366
1367 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1368 talloc_free(tmp_ctx);
1369 return ISC_R_NOMEMORY;
1370 }
1371
1372 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1373 attrs, "objectClass=dnsZone");
1374 if (ret != LDB_SUCCESS) {
1375 continue;
1376 }
1377
1378 for (j=0; j<res->count; j++) {
1379 isc_result_t result;
1380 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1381 struct ldb_dn *zone_dn;
1382
1383 if (zone == NULL) {
1384 continue;
1385 }
1386 /* Ignore zones that are not handled in BIND */
1387 if ((strcmp(zone, "RootDNSServers") == 0) ||
1388 (strcmp(zone, "..TrustAnchors") == 0)) {
1389 continue;
1390 }
1391 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1392 if (zone_dn == NULL) {
1393 talloc_free(tmp_ctx);
1394 return ISC_R_NOMEMORY;
1395 }
1396
1397 if (!b9_has_soa(state, zone_dn, zone)) {
1398 continue;
1399 }
1400
1401 if (b9_zone_exists(state, zone)) {
1402 state->log(ISC_LOG_WARNING, "samba_dlz: Ignoring duplicate zone '%s' from '%s'",
1403 zone, ldb_dn_get_linearized(zone_dn));
1404 continue;
1405 }
1406
1407 if (!b9_zone_add(state, zone)) {
1408 talloc_free(tmp_ctx);
1409 return ISC_R_NOMEMORY;
1410 }
1411
1412 #if DLZ_DLOPEN_VERSION < 3
1413 result = state->writeable_zone(view, zone);
1414 #else
1415 result = state->writeable_zone(view, dlzdb, zone);
1416 #endif
1417 if (result != ISC_R_SUCCESS) {
1418 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1419 zone);
1420 talloc_free(tmp_ctx);
1421 return result;
1422 }
1423 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1424 }
1425 }
1426
1427 talloc_free(tmp_ctx);
1428 return ISC_R_SUCCESS;
1429 }
1430
1431 /*
1432 authorize a zone update
1433 */
1434 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1435 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1436 void *dbdata)
1437 {
1438 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1439 TALLOC_CTX *tmp_ctx;
1440 DATA_BLOB ap_req;
1441 struct cli_credentials *server_credentials;
1442 char *keytab_name;
1443 char *keytab_file = NULL;
1444 int ret;
1445 int ldb_ret;
1446 NTSTATUS nt_status;
1447 struct gensec_security *gensec_ctx;
1448 struct auth_session_info *session_info;
1449 struct ldb_dn *dn;
1450 isc_result_t result;
1451 struct ldb_result *res;
1452 const char * attrs[] = { NULL };
1453 uint32_t access_mask;
1454 struct gensec_settings *settings = NULL;
1455 const struct gensec_security_ops **backends = NULL;
1456 size_t idx = 0;
1457
1458 /* Remove cached credentials, if any */
1459 if (state->session_info) {
1460 talloc_free(state->session_info);
1461 state->session_info = NULL;
1462 }
1463 if (state->update_name) {
1464 talloc_free(state->update_name);
1465 state->update_name = NULL;
1466 }
1467
1468 tmp_ctx = talloc_new(NULL);
1469 if (tmp_ctx == NULL) {
1470 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1471 return ISC_FALSE;
1472 }
1473
1474 ap_req = data_blob_const(keydata, keydatalen);
1475 server_credentials = cli_credentials_init(tmp_ctx);
1476 if (!server_credentials) {
1477 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1478 talloc_free(tmp_ctx);
1479 return ISC_FALSE;
1480 }
1481
1482 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1483 cli_credentials_set_conf(server_credentials, state->lp);
1484
1485 keytab_file = talloc_asprintf(tmp_ctx,
1486 "%s/dns.keytab",
1487 lpcfg_binddns_dir(state->lp));
1488 if (keytab_file == NULL) {
1489 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1490 talloc_free(tmp_ctx);
1491 return ISC_FALSE;
1492 }
1493
1494 if (!file_exist(keytab_file)) {
1495 keytab_file = talloc_asprintf(tmp_ctx,
1496 "%s/dns.keytab",
1497 lpcfg_private_dir(state->lp));
1498 if (keytab_file == NULL) {
1499 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1500 talloc_free(tmp_ctx);
1501 return ISC_FALSE;
1502 }
1503 }
1504
1505 keytab_name = talloc_asprintf(tmp_ctx, "FILE:%s", keytab_file);
1506 if (keytab_name == NULL) {
1507 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1508 talloc_free(tmp_ctx);
1509 return ISC_FALSE;
1510 }
1511
1512 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1513 CRED_SPECIFIED);
1514 if (ret != 0) {
1515 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1516 keytab_name);
1517 talloc_free(tmp_ctx);
1518 return ISC_FALSE;
1519 }
1520 talloc_free(keytab_name);
1521
1522 settings = lpcfg_gensec_settings(tmp_ctx, state->lp);
1523 if (settings == NULL) {
1524 state->log(ISC_LOG_ERROR, "samba_dlz: lpcfg_gensec_settings failed");
1525 talloc_free(tmp_ctx);
1526 return ISC_FALSE;
1527 }
1528 backends = talloc_zero_array(settings,
1529 const struct gensec_security_ops *, 3);
1530 if (backends == NULL) {
1531 state->log(ISC_LOG_ERROR, "samba_dlz: talloc_zero_array gensec_security_ops failed");
1532 talloc_free(tmp_ctx);
1533 return ISC_FALSE;
1534 }
1535 settings->backends = backends;
1536
1537 gensec_init();
1538
1539 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_KERBEROS5);
1540 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_SPNEGO);
1541
1542 nt_status = gensec_server_start(tmp_ctx, settings,
1543 state->auth_context, &gensec_ctx);
1544 if (!NT_STATUS_IS_OK(nt_status)) {
1545 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1546 talloc_free(tmp_ctx);
1547 return ISC_FALSE;
1548 }
1549
1550 gensec_set_credentials(gensec_ctx, server_credentials);
1551
1552 nt_status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
1553 if (!NT_STATUS_IS_OK(nt_status)) {
1554 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1555 talloc_free(tmp_ctx);
1556 return ISC_FALSE;
1557 }
1558
1559 /*
1560 * We only allow SPNEGO/KRB5 and make sure the backend
1561 * to is RPC/IPC free.
1562 *
1563 * See gensec_gssapi_update_internal() as
1564 * GENSEC_SERVER.
1565 *
1566 * It allows gensec_update() not to block.
1567 *
1568 * If that changes in future we need to use
1569 * gensec_update_send/recv here!
1570 */
1571 nt_status = gensec_update(gensec_ctx, tmp_ctx, ap_req, &ap_req);
1572 if (!NT_STATUS_IS_OK(nt_status)) {
1573 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1574 talloc_free(tmp_ctx);
1575 return ISC_FALSE;
1576 }
1577
1578 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1579 if (!NT_STATUS_IS_OK(nt_status)) {
1580 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1581 talloc_free(tmp_ctx);
1582 return ISC_FALSE;
1583 }
1584
1585 /* Get the DN from name */
1586 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1587 if (result != ISC_R_SUCCESS) {
1588 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1589 talloc_free(tmp_ctx);
1590 return ISC_FALSE;
1591 }
1592
1593 /* make sure the dn exists, or find parent dn in case new object is being added */
1594 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1595 attrs, "objectClass=dnsNode");
1596 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1597 ldb_dn_remove_child_components(dn, 1);
1598 access_mask = SEC_ADS_CREATE_CHILD;
1599 talloc_free(res);
1600 } else if (ldb_ret == LDB_SUCCESS) {
1601 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1602 talloc_free(res);
1603 } else {
1604 talloc_free(tmp_ctx);
1605 return ISC_FALSE;
1606 }
1607
1608 /* Do ACL check */
1609 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1610 session_info->security_token,
1611 access_mask, NULL);
1612 if (ldb_ret != LDB_SUCCESS) {
1613 state->log(ISC_LOG_INFO,
1614 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1615 signer, name, type, ldb_strerror(ldb_ret));
1616 talloc_free(tmp_ctx);
1617 return ISC_FALSE;
1618 }
1619
1620 /* Cache session_info, so it can be used in the actual add/delete operation */
1621 state->update_name = talloc_strdup(state, name);
1622 if (state->update_name == NULL) {
1623 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1624 talloc_free(tmp_ctx);
1625 return ISC_FALSE;
1626 }
1627 state->session_info = talloc_steal(state, session_info);
1628
1629 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1630 signer, name, tcpaddr, type, key);
1631
1632 talloc_free(tmp_ctx);
1633 return ISC_TRUE;
1634 }
1635
1636 /*
1637 see if two dns records match
1638 */
1639 static bool b9_record_match(struct dlz_bind9_data *state,
1640 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1641 {
1642 bool status;
1643 int i;
1644 struct in6_addr rec1_in_addr6;
1645 struct in6_addr rec2_in_addr6;
1646
1647 if (rec1->wType != rec2->wType) {
1648 return false;
1649 }
1650 /* see if this type is single valued */
1651 if (b9_single_valued(rec1->wType)) {
1652 return true;
1653 }
1654
1655 /* see if the data matches */
1656 switch (rec1->wType) {
1657 case DNS_TYPE_A:
1658 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1659 case DNS_TYPE_AAAA: {
1660 int ret;
1661
1662 ret = inet_pton(AF_INET6, rec1->data.ipv6, &rec1_in_addr6);
1663 if (ret != 1) {
1664 return false;
1665 }
1666 ret = inet_pton(AF_INET6, rec2->data.ipv6, &rec2_in_addr6);
1667 if (ret != 1) {
1668 return false;
1669 }
1670
1671 return memcmp(&rec1_in_addr6, &rec2_in_addr6, sizeof(rec1_in_addr6)) == 0;
1672 }
1673 case DNS_TYPE_CNAME:
1674 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1675 case DNS_TYPE_TXT:
1676 status = (rec1->data.txt.count == rec2->data.txt.count);
1677 if (!status) return status;
1678 for (i=0; i<rec1->data.txt.count; i++) {
1679 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1680 }
1681 return status;
1682 case DNS_TYPE_PTR:
1683 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1684 case DNS_TYPE_NS:
1685 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1686
1687 case DNS_TYPE_SRV:
1688 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1689 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1690 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1691 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1692
1693 case DNS_TYPE_MX:
1694 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1695 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1696
1697 case DNS_TYPE_HINFO:
1698 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1699 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1700
1701 case DNS_TYPE_SOA:
1702 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1703 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1704 rec1->data.soa.serial == rec2->data.soa.serial &&
1705 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1706 rec1->data.soa.retry == rec2->data.soa.retry &&
1707 rec1->data.soa.expire == rec2->data.soa.expire &&
1708 rec1->data.soa.minimum == rec2->data.soa.minimum;
1709 default:
1710 state->log(ISC_LOG_ERROR, "samba_dlz b9_record_match: unhandled record type %u",
1711 rec1->wType);
1712 break;
1713 }
1714
1715 return false;
1716 }
1717
1718 /*
1719 * Update session_info on samdb using the cached credentials
1720 */
1721 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1722 {
1723 int ret;
1724
1725 if (state->update_name == NULL || state->session_info == NULL) {
1726 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1727 return false;
1728 }
1729
1730 /* Do not use client credentials, if we're not updating the client specified name */
1731 if (strcmp(state->update_name, name) != 0) {
1732 return true;
1733 }
1734
1735 ret = ldb_set_opaque(
1736 state->samdb,
1737 DSDB_SESSION_INFO,
1738 state->session_info);
1739 if (ret != LDB_SUCCESS) {
1740 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1741 return false;
1742 }
1743
1744 return true;
1745 }
1746
1747 /*
1748 * Reset session_info on samdb as system session
1749 */
1750 static void b9_reset_session_info(struct dlz_bind9_data *state)
1751 {
1752 ldb_set_opaque(
1753 state->samdb,
1754 DSDB_SESSION_INFO,
1755 system_session(state->lp));
1756 }
1757
1758 /*
1759 add or modify a rdataset
1760 */
1761 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1762 {
1763 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1764 struct dnsp_DnssrvRpcRecord *rec;
1765 struct ldb_dn *dn;
1766 isc_result_t result;
1767 bool tombstoned = false;
1768 bool needs_add = false;
1769 struct dnsp_DnssrvRpcRecord *recs = NULL;
1770 uint16_t num_recs = 0;
1771 uint16_t first = 0;
1772 uint16_t i;
1773 NTTIME t;
1774 WERROR werr;
1775
1776 if (state->transaction_token != (void*)version) {
1777 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1778 return ISC_R_FAILURE;
1779 }
1780
1781 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1782 if (rec == NULL) {
1783 return ISC_R_NOMEMORY;
1784 }
1785
1786 rec->rank = DNS_RANK_ZONE;
1787
1788 if (!b9_parse(state, rdatastr, rec)) {
1789 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1790 talloc_free(rec);
1791 return ISC_R_FAILURE;
1792 }
1793
1794 /* find the DN of the record */
1795 result = b9_find_name_dn(state, name, rec, &dn);
1796 if (result != ISC_R_SUCCESS) {
1797 talloc_free(rec);
1798 return result;
1799 }
1800
1801 /* get any existing records */
1802 werr = dns_common_lookup(state->samdb, rec, dn,
1803 &recs, &num_recs, &tombstoned);
1804 if (W_ERROR_EQUAL(werr, WERR_DNS_ERROR_NAME_DOES_NOT_EXIST)) {
1805 needs_add = true;
1806 werr = WERR_OK;
1807 }
1808 if (!W_ERROR_IS_OK(werr)) {
1809 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
1810 ldb_dn_get_linearized(dn), win_errstr(werr));
1811 talloc_free(rec);
1812 return ISC_R_FAILURE;
1813 }
1814
1815 if (tombstoned) {
1816 /*
1817 * we need to keep the existing tombstone record
1818 * and ignore it
1819 */
1820 first = num_recs;
1821 }
1822
1823 /* there are existing records. We need to see if this will
1824 * replace a record or add to it
1825 */
1826 for (i=first; i < num_recs; i++) {
1827 if (b9_record_match(state, rec, &recs[i])) {
1828 break;
1829 }
1830 }
1831 if (i == UINT16_MAX) {
1832 state->log(ISC_LOG_ERROR, "samba_dlz: failed to already %u dnsRecord values for %s",
1833 i, ldb_dn_get_linearized(dn));
1834 talloc_free(rec);
1835 return ISC_R_FAILURE;
1836 }
1837
1838 if (i == num_recs) {
1839 /* adding a new value */
1840 recs = talloc_realloc(rec, recs,
1841 struct dnsp_DnssrvRpcRecord,
1842 num_recs + 1);
1843 if (recs == NULL) {
1844 talloc_free(rec);
1845 return ISC_R_NOMEMORY;
1846 }
1847 num_recs++;
1848
1849 if (dns_name_is_static(recs, num_recs)) {
1850 rec->dwTimeStamp = 0;
1851 } else {
1852 unix_to_nt_time(&t, time(NULL));
1853 t /= 10 * 1000 * 1000; /* convert to seconds */
1854 t /= 3600; /* convert to hours */
1855 rec->dwTimeStamp = (uint32_t)t;
1856 }
1857 }
1858
1859 recs[i] = *rec;
1860
1861 if (!b9_set_session_info(state, name)) {
1862 talloc_free(rec);
1863 return ISC_R_FAILURE;
1864 }
1865
1866 /* modify the record */
1867 werr = dns_common_replace(state->samdb, rec, dn,
1868 needs_add,
1869 state->soa_serial,
1870 recs, num_recs);
1871 b9_reset_session_info(state);
1872 if (!W_ERROR_IS_OK(werr)) {
1873 state->log(ISC_LOG_ERROR, "samba_dlz: failed to %s %s - %s",
1874 needs_add ? "add" : "modify",
1875 ldb_dn_get_linearized(dn), win_errstr(werr));
1876 talloc_free(rec);
1877 return ISC_R_FAILURE;
1878 }
1879
1880 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1881
1882 talloc_free(rec);
1883 return ISC_R_SUCCESS;
1884 }
1885
1886 /*
1887 remove a rdataset
1888 */
1889 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1890 {
1891 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1892 struct dnsp_DnssrvRpcRecord *rec;
1893 struct ldb_dn *dn;
1894 isc_result_t result;
1895 struct dnsp_DnssrvRpcRecord *recs = NULL;
1896 uint16_t num_recs = 0;
1897 uint16_t i;
1898 WERROR werr;
1899
1900 if (state->transaction_token != (void*)version) {
1901 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1902 return ISC_R_FAILURE;
1903 }
1904
1905 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1906 if (rec == NULL) {
1907 return ISC_R_NOMEMORY;
1908 }
1909
1910 if (!b9_parse(state, rdatastr, rec)) {
1911 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1912 talloc_free(rec);
1913 return ISC_R_FAILURE;
1914 }
1915
1916 /* find the DN of the record */
1917 result = b9_find_name_dn(state, name, rec, &dn);
1918 if (result != ISC_R_SUCCESS) {
1919 talloc_free(rec);
1920 return result;
1921 }
1922
1923 /* get the existing records */
1924 werr = dns_common_lookup(state->samdb, rec, dn,
1925 &recs, &num_recs, NULL);
1926 if (!W_ERROR_IS_OK(werr)) {
1927 talloc_free(rec);
1928 return ISC_R_NOTFOUND;
1929 }
1930
1931 for (i=0; i < num_recs; i++) {
1932 if (b9_record_match(state, rec, &recs[i])) {
1933 recs[i] = (struct dnsp_DnssrvRpcRecord) {
1934 .wType = DNS_TYPE_TOMBSTONE,
1935 };
1936 break;
1937 }
1938 }
1939 if (i == num_recs) {
1940 talloc_free(rec);
1941 return ISC_R_NOTFOUND;
1942 }
1943
1944 if (!b9_set_session_info(state, name)) {
1945 talloc_free(rec);
1946 return ISC_R_FAILURE;
1947 }
1948
1949 /* modify the record */
1950 werr = dns_common_replace(state->samdb, rec, dn,
1951 false,/* needs_add */
1952 state->soa_serial,
1953 recs, num_recs);
1954 b9_reset_session_info(state);
1955 if (!W_ERROR_IS_OK(werr)) {
1956 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1957 ldb_dn_get_linearized(dn), win_errstr(werr));
1958 talloc_free(rec);
1959 return ISC_R_FAILURE;
1960 }
1961
1962 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1963
1964 talloc_free(rec);
1965 return ISC_R_SUCCESS;
1966 }
1967
1968
1969 /*
1970 delete all records of the given type
1971 */
1972 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1973 {
1974 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1975 TALLOC_CTX *tmp_ctx;
1976 struct ldb_dn *dn;
1977 isc_result_t result;
1978 enum dns_record_type dns_type;
1979 bool found = false;
1980 struct dnsp_DnssrvRpcRecord *recs = NULL;
1981 uint16_t num_recs = 0;
1982 uint16_t ri = 0;
1983 WERROR werr;
1984
1985 if (state->transaction_token != (void*)version) {
1986 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1987 return ISC_R_FAILURE;
1988 }
1989
1990 if (!b9_dns_type(type, &dns_type)) {
1991 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1992 return ISC_R_FAILURE;
1993 }
1994
1995 tmp_ctx = talloc_new(state);
1996
1997 /* find the DN of the record */
1998 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1999 if (result != ISC_R_SUCCESS) {
2000 talloc_free(tmp_ctx);
2001 return result;
2002 }
2003
2004 /* get the existing records */
2005 werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
2006 &recs, &num_recs, NULL);
2007 if (!W_ERROR_IS_OK(werr)) {
2008 talloc_free(tmp_ctx);
2009 return ISC_R_NOTFOUND;
2010 }
2011
2012 for (ri=0; ri < num_recs; ri++) {
2013 if (dns_type != recs[ri].wType) {
2014 continue;
2015 }
2016
2017 found = true;
2018 recs[ri] = (struct dnsp_DnssrvRpcRecord) {
2019 .wType = DNS_TYPE_TOMBSTONE,
2020 };
2021 }
2022
2023 if (!found) {
2024 talloc_free(tmp_ctx);
2025 return ISC_R_FAILURE;
2026 }
2027
2028 if (!b9_set_session_info(state, name)) {
2029 talloc_free(tmp_ctx);
2030 return ISC_R_FAILURE;
2031 }
2032
2033 /* modify the record */
2034 werr = dns_common_replace(state->samdb, tmp_ctx, dn,
2035 false,/* needs_add */
2036 state->soa_serial,
2037 recs, num_recs);
2038 b9_reset_session_info(state);
2039 if (!W_ERROR_IS_OK(werr)) {
2040 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
2041 ldb_dn_get_linearized(dn), win_errstr(werr));
2042 talloc_free(tmp_ctx);
2043 return ISC_R_FAILURE;
2044 }
2045
2046 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
2047
2048 talloc_free(tmp_ctx);
2049 return ISC_R_SUCCESS;
2050 }
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