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s4:torture: send the TCONX_FLAG_EXTENDED_RESPONSE flag
[Samba/gebeck_regimport.git] / source4 / dns_server / dlz_bind9.c
blobc3c4172a1732857a6f1490f585ecc88147ef3d76
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 auth4_context *auth_context;
58 struct auth_session_info *session_info;
59 char *update_name;
60
61 /* helper functions from the dlz_dlopen driver */
62 log_t *log;
63 dns_sdlz_putrr_t *putrr;
64 dns_sdlz_putnamedrr_t *putnamedrr;
65 dns_dlz_writeablezone_t *writeable_zone;
66 };
67
68 static struct dlz_bind9_data *dlz_bind9_state = NULL;
69 static int dlz_bind9_state_ref_count = 0;
70
71 static const char *zone_prefixes[] = {
72 "CN=MicrosoftDNS,DC=DomainDnsZones",
73 "CN=MicrosoftDNS,DC=ForestDnsZones",
74 "CN=MicrosoftDNS,CN=System",
75 NULL
76 };
77
78 /*
79 return the version of the API
80 */
81 _PUBLIC_ int dlz_version(unsigned int *flags)
82 {
83 return DLZ_DLOPEN_VERSION;
84 }
85
86 /*
87 remember a helper function from the bind9 dlz_dlopen driver
88 */
89 static void b9_add_helper(struct dlz_bind9_data *state, const char *helper_name, void *ptr)
90 {
91 if (strcmp(helper_name, "log") == 0) {
92 state->log = ptr;
93 }
94 if (strcmp(helper_name, "putrr") == 0) {
95 state->putrr = ptr;
96 }
97 if (strcmp(helper_name, "putnamedrr") == 0) {
98 state->putnamedrr = ptr;
99 }
100 if (strcmp(helper_name, "writeable_zone") == 0) {
101 state->writeable_zone = ptr;
102 }
103 }
104
105 /*
106 format a record for bind9
107 */
108 static bool b9_format(struct dlz_bind9_data *state,
109 TALLOC_CTX *mem_ctx,
110 struct dnsp_DnssrvRpcRecord *rec,
111 const char **type, const char **data)
112 {
113 uint32_t i;
114 char *tmp;
115
116 switch (rec->wType) {
117 case DNS_TYPE_A:
118 *type = "a";
119 *data = rec->data.ipv4;
120 break;
121
122 case DNS_TYPE_AAAA:
123 *type = "aaaa";
124 *data = rec->data.ipv6;
125 break;
126
127 case DNS_TYPE_CNAME:
128 *type = "cname";
129 *data = rec->data.cname;
130 break;
131
132 case DNS_TYPE_TXT:
133 *type = "txt";
134 tmp = talloc_asprintf(mem_ctx, "\"%s\"", rec->data.txt.str[0]);
135 for (i=1; i<rec->data.txt.count; i++) {
136 tmp = talloc_asprintf_append(tmp, " \"%s\"", rec->data.txt.str[i]);
137 }
138 *data = tmp;
139 break;
140
141 case DNS_TYPE_PTR:
142 *type = "ptr";
143 *data = rec->data.ptr;
144 break;
145
146 case DNS_TYPE_SRV:
147 *type = "srv";
148 *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
149 rec->data.srv.wPriority,
150 rec->data.srv.wWeight,
151 rec->data.srv.wPort,
152 rec->data.srv.nameTarget);
153 break;
154
155 case DNS_TYPE_MX:
156 *type = "mx";
157 *data = talloc_asprintf(mem_ctx, "%u %s",
158 rec->data.mx.wPriority,
159 rec->data.mx.nameTarget);
160 break;
161
162 case DNS_TYPE_HINFO:
163 *type = "hinfo";
164 *data = talloc_asprintf(mem_ctx, "%s %s",
165 rec->data.hinfo.cpu,
166 rec->data.hinfo.os);
167 break;
168
169 case DNS_TYPE_NS:
170 *type = "ns";
171 *data = rec->data.ns;
172 break;
173
174 case DNS_TYPE_SOA: {
175 const char *mname;
176 *type = "soa";
177
178 /* we need to fake the authoritative nameserver to
179 * point at ourselves. This is how AD DNS servers
180 * force clients to send updates to the right local DC
181 */
182 mname = talloc_asprintf(mem_ctx, "%s.%s",
183 lpcfg_netbios_name(state->lp), lpcfg_dnsdomain(state->lp));
184 if (mname == NULL) {
185 return false;
186 }
187 mname = strlower_talloc(mem_ctx, mname);
188 if (mname == NULL) {
189 return false;
190 }
191
192 state->soa_serial = rec->data.soa.serial;
193
194 *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
195 mname,
196 rec->data.soa.rname,
197 rec->data.soa.serial,
198 rec->data.soa.refresh,
199 rec->data.soa.retry,
200 rec->data.soa.expire,
201 rec->data.soa.minimum);
202 break;
203 }
204
205 default:
206 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
207 rec->wType);
208 return false;
209 }
210
211 return true;
212 }
213
214 static const struct {
215 enum dns_record_type dns_type;
216 const char *typestr;
217 bool single_valued;
218 } dns_typemap[] = {
219 { DNS_TYPE_A, "A" , false},
220 { DNS_TYPE_AAAA, "AAAA" , false},
221 { DNS_TYPE_CNAME, "CNAME" , true},
222 { DNS_TYPE_TXT, "TXT" , false},
223 { DNS_TYPE_PTR, "PTR" , false},
224 { DNS_TYPE_SRV, "SRV" , false},
225 { DNS_TYPE_MX, "MX" , false},
226 { DNS_TYPE_HINFO, "HINFO" , false},
227 { DNS_TYPE_NS, "NS" , false},
228 { DNS_TYPE_SOA, "SOA" , true},
229 };
230
231
232 /*
233 see if a DNS type is single valued
234 */
235 static bool b9_single_valued(enum dns_record_type dns_type)
236 {
237 int i;
238 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
239 if (dns_typemap[i].dns_type == dns_type) {
240 return dns_typemap[i].single_valued;
241 }
242 }
243 return false;
244 }
245
246 /*
247 see if a DNS type is single valued
248 */
249 static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
250 {
251 int i;
252 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
253 if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
254 *dtype = dns_typemap[i].dns_type;
255 return true;
256 }
257 }
258 return false;
259 }
260
261
262 #define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
263 (ret) = strtok_r(str, sep, &saveptr); \
264 if ((ret) == NULL) return false; \
265 } while (0)
266
267 #define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
268 char *istr = strtok_r(str, sep, &saveptr); \
269 if ((istr) == NULL) return false; \
270 (ret) = strtoul(istr, NULL, 10); \
271 } while (0)
272
273 /*
274 parse a record from bind9
275 */
276 static bool b9_parse(struct dlz_bind9_data *state,
277 const char *rdatastr,
278 struct dnsp_DnssrvRpcRecord *rec)
279 {
280 char *full_name, *dclass, *type;
281 char *str, *tmp, *saveptr=NULL;
282 int i;
283
284 str = talloc_strdup(rec, rdatastr);
285 if (str == NULL) {
286 return false;
287 }
288
289 /* parse the SDLZ string form */
290 DNS_PARSE_STR(full_name, str, "\t", saveptr);
291 DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
292 DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
293 DNS_PARSE_STR(type, NULL, "\t", saveptr);
294
295 /* construct the record */
296 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
297 if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
298 rec->wType = dns_typemap[i].dns_type;
299 break;
300 }
301 }
302 if (i == ARRAY_SIZE(dns_typemap)) {
303 state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
304 type, full_name);
305 return false;
306 }
307
308 switch (rec->wType) {
309 case DNS_TYPE_A:
310 DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
311 break;
312
313 case DNS_TYPE_AAAA:
314 DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
315 break;
316
317 case DNS_TYPE_CNAME:
318 DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
319 break;
320
321 case DNS_TYPE_TXT:
322 rec->data.txt.count = 0;
323 rec->data.txt.str = talloc_array(rec, const char *, rec->data.txt.count);
324 tmp = strtok_r(NULL, "\t", &saveptr);
325 while (tmp) {
326 rec->data.txt.str = talloc_realloc(rec, rec->data.txt.str, const char *,
327 rec->data.txt.count+1);
328 if (tmp[0] == '"') {
329 /* Strip quotes */
330 rec->data.txt.str[rec->data.txt.count] = talloc_strndup(rec, &tmp[1], strlen(tmp)-2);
331 } else {
332 rec->data.txt.str[rec->data.txt.count] = talloc_strdup(rec, tmp);
333 }
334 rec->data.txt.count++;
335 tmp = strtok_r(NULL, " ", &saveptr);
336 }
337 break;
338
339 case DNS_TYPE_PTR:
340 DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
341 break;
342
343 case DNS_TYPE_SRV:
344 DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
345 DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
346 DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
347 DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
348 break;
349
350 case DNS_TYPE_MX:
351 DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
352 DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
353 break;
354
355 case DNS_TYPE_HINFO:
356 DNS_PARSE_STR(rec->data.hinfo.cpu, NULL, " ", saveptr);
357 DNS_PARSE_STR(rec->data.hinfo.os, NULL, " ", saveptr);
358 break;
359
360 case DNS_TYPE_NS:
361 DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
362 break;
363
364 case DNS_TYPE_SOA:
365 DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
366 DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
367 DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
368 DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
369 DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
370 DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
371 DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
372 break;
373
374 default:
375 state->log(ISC_LOG_ERROR, "samba b9_parse: unhandled record type %u",
376 rec->wType);
377 return false;
378 }
379
380 /* we should be at the end of the buffer now */
381 if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
382 state->log(ISC_LOG_ERROR, "samba b9_parse: expected data at end of string for '%s'");
383 return false;
384 }
385
386 return true;
387 }
388
389 /*
390 send a resource recond to bind9
391 */
392 static isc_result_t b9_putrr(struct dlz_bind9_data *state,
393 void *handle, struct dnsp_DnssrvRpcRecord *rec,
394 const char **types)
395 {
396 isc_result_t result;
397 const char *type, *data;
398 TALLOC_CTX *tmp_ctx = talloc_new(state);
399
400 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
401 return ISC_R_FAILURE;
402 }
403
404 if (data == NULL) {
405 talloc_free(tmp_ctx);
406 return ISC_R_NOMEMORY;
407 }
408
409 if (types) {
410 int i;
411 for (i=0; types[i]; i++) {
412 if (strcmp(types[i], type) == 0) break;
413 }
414 if (types[i] == NULL) {
415 /* skip it */
416 return ISC_R_SUCCESS;
417 }
418 }
419
420 result = state->putrr(handle, type, rec->dwTtlSeconds, data);
421 if (result != ISC_R_SUCCESS) {
422 state->log(ISC_LOG_ERROR, "Failed to put rr");
423 }
424 talloc_free(tmp_ctx);
425 return result;
426 }
427
428
429 /*
430 send a named resource recond to bind9
431 */
432 static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
433 void *handle, const char *name,
434 struct dnsp_DnssrvRpcRecord *rec)
435 {
436 isc_result_t result;
437 const char *type, *data;
438 TALLOC_CTX *tmp_ctx = talloc_new(state);
439
440 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
441 return ISC_R_FAILURE;
442 }
443
444 if (data == NULL) {
445 talloc_free(tmp_ctx);
446 return ISC_R_NOMEMORY;
447 }
448
449 result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
450 if (result != ISC_R_SUCCESS) {
451 state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
452 }
453 talloc_free(tmp_ctx);
454 return result;
455 }
456
457 /*
458 parse options
459 */
460 static isc_result_t parse_options(struct dlz_bind9_data *state,
461 unsigned int argc, char *argv[],
462 struct b9_options *options)
463 {
464 int opt;
465 poptContext pc;
466 struct poptOption long_options[] = {
467 { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
468 { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
469 { NULL }
470 };
471
472 pc = poptGetContext("dlz_bind9", argc, (const char **)argv, long_options,
473 POPT_CONTEXT_KEEP_FIRST);
474 while ((opt = poptGetNextOpt(pc)) != -1) {
475 switch (opt) {
476 default:
477 state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
478 poptBadOption(pc, 0), poptStrerror(opt));
479 return ISC_R_FAILURE;
480 }
481 }
482
483 return ISC_R_SUCCESS;
484 }
485
486
487 /*
488 * Create session info from PAC
489 * This is called as auth_context->generate_session_info_pac()
490 */
491 static NTSTATUS b9_generate_session_info_pac(struct auth4_context *auth_context,
492 TALLOC_CTX *mem_ctx,
493 struct smb_krb5_context *smb_krb5_context,
494 DATA_BLOB *pac_blob,
495 const char *principal_name,
496 const struct tsocket_address *remote_addr,
497 uint32_t session_info_flags,
498 struct auth_session_info **session_info)
499 {
500 NTSTATUS status;
501 struct auth_user_info_dc *user_info_dc;
502 TALLOC_CTX *tmp_ctx;
503
504 tmp_ctx = talloc_new(mem_ctx);
505 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
506
507 status = kerberos_pac_blob_to_user_info_dc(tmp_ctx,
508 *pac_blob,
509 smb_krb5_context->krb5_context,
510 &user_info_dc,
511 NULL,
512 NULL);
513 if (!NT_STATUS_IS_OK(status)) {
514 talloc_free(tmp_ctx);
515 return status;
516 }
517
518 if (user_info_dc->info->authenticated) {
519 session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
520 }
521
522 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
523
524 status = auth_generate_session_info(mem_ctx, NULL, NULL, user_info_dc,
525 session_info_flags, session_info);
526 if (!NT_STATUS_IS_OK(status)) {
527 talloc_free(tmp_ctx);
528 return status;
529 }
530
531 talloc_free(tmp_ctx);
532 return status;
533 }
534
535 /* Callback for the DEBUG() system, to catch the remaining messages */
536 static void b9_debug(void *private_ptr, int msg_level, const char *msg)
537 {
538 static const int isc_log_map[] = {
539 ISC_LOG_CRITICAL, /* 0 */
540 ISC_LOG_ERROR, /* 1 */
541 ISC_LOG_WARNING, /* 2 */
542 ISC_LOG_NOTICE /* 3 */
543 };
544 struct dlz_bind9_data *state = private_ptr;
545 int isc_log_level;
546
547 if (msg_level >= ARRAY_SIZE(isc_log_map) || msg_level < 0) {
548 isc_log_level = ISC_LOG_INFO;
549 } else {
550 isc_log_level = isc_log_map[msg_level];
551 }
552 state->log(isc_log_level, "samba_dlz: %s", msg);
553 }
554
555 static int dlz_state_debug_unregister(struct dlz_bind9_data *state)
556 {
557 /* Stop logging (to the bind9 logs) */
558 debug_set_callback(NULL, NULL);
559 return 0;
560 }
561
562 /*
563 called to initialise the driver
564 */
565 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
566 unsigned int argc, char *argv[],
567 void **dbdata, ...)
568 {
569 struct dlz_bind9_data *state;
570 const char *helper_name;
571 va_list ap;
572 isc_result_t result;
573 struct ldb_dn *dn;
574 NTSTATUS nt_status;
575
576 if (dlz_bind9_state != NULL) {
577 *dbdata = dlz_bind9_state;
578 dlz_bind9_state_ref_count++;
579 return ISC_R_SUCCESS;
580 }
581
582 state = talloc_zero(NULL, struct dlz_bind9_data);
583 if (state == NULL) {
584 return ISC_R_NOMEMORY;
585 }
586
587 talloc_set_destructor(state, dlz_state_debug_unregister);
588
589 /* fill in the helper functions */
590 va_start(ap, dbdata);
591 while ((helper_name = va_arg(ap, const char *)) != NULL) {
592 b9_add_helper(state, helper_name, va_arg(ap, void*));
593 }
594 va_end(ap);
595
596 /* Do not install samba signal handlers */
597 fault_setup_disable();
598
599 /* Start logging (to the bind9 logs) */
600 debug_set_callback(state, b9_debug);
601
602 state->ev_ctx = s4_event_context_init(state);
603 if (state->ev_ctx == NULL) {
604 result = ISC_R_NOMEMORY;
605 goto failed;
606 }
607
608 result = parse_options(state, argc, argv, &state->options);
609 if (result != ISC_R_SUCCESS) {
610 goto failed;
611 }
612
613 state->lp = loadparm_init_global(true);
614 if (state->lp == NULL) {
615 result = ISC_R_NOMEMORY;
616 goto failed;
617 }
618
619 if (state->options.debug) {
620 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
621 } else {
622 lpcfg_do_global_parameter(state->lp, "log level", "0");
623 }
624
625 if (smb_krb5_init_context(state, state->ev_ctx, state->lp, &state->smb_krb5_ctx) != 0) {
626 result = ISC_R_NOMEMORY;
627 goto failed;
628 }
629
630 nt_status = gensec_init();
631 if (!NT_STATUS_IS_OK(nt_status)) {
632 result = ISC_R_NOMEMORY;
633 goto failed;
634 }
635
636 state->auth_context = talloc_zero(state, struct auth4_context);
637 if (state->auth_context == NULL) {
638 result = ISC_R_NOMEMORY;
639 goto failed;
640 }
641
642 if (state->options.url == NULL) {
643 state->options.url = lpcfg_private_path(state, state->lp, "dns/sam.ldb");
644 if (state->options.url == NULL) {
645 result = ISC_R_NOMEMORY;
646 goto failed;
647 }
648 }
649
650 state->samdb = samdb_connect_url(state, state->ev_ctx, state->lp,
651 system_session(state->lp), 0, state->options.url);
652 if (state->samdb == NULL) {
653 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to connect to %s",
654 state->options.url);
655 result = ISC_R_FAILURE;
656 goto failed;
657 }
658
659 dn = ldb_get_default_basedn(state->samdb);
660 if (dn == NULL) {
661 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
662 state->options.url, ldb_errstring(state->samdb));
663 result = ISC_R_FAILURE;
664 goto failed;
665 }
666
667 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
668 ldb_dn_get_linearized(dn));
669
670 state->auth_context->event_ctx = state->ev_ctx;
671 state->auth_context->lp_ctx = state->lp;
672 state->auth_context->sam_ctx = state->samdb;
673 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
674
675 *dbdata = state;
676 dlz_bind9_state = state;
677 dlz_bind9_state_ref_count++;
678
679 return ISC_R_SUCCESS;
680
681 failed:
682 talloc_free(state);
683 return result;
684 }
685
686 /*
687 shutdown the backend
688 */
689 _PUBLIC_ void dlz_destroy(void *dbdata)
690 {
691 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
692 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
693
694 dlz_bind9_state_ref_count--;
695 if (dlz_bind9_state_ref_count == 0) {
696 talloc_unlink(state, state->samdb);
697 talloc_free(state);
698 dlz_bind9_state = NULL;
699 }
700 }
701
702
703 /*
704 return the base DN for a zone
705 */
706 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
707 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
708 {
709 int ret;
710 TALLOC_CTX *tmp_ctx = talloc_new(state);
711 const char *attrs[] = { NULL };
712 int i;
713
714 for (i=0; zone_prefixes[i]; i++) {
715 struct ldb_dn *dn;
716 struct ldb_result *res;
717
718 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
719 if (dn == NULL) {
720 talloc_free(tmp_ctx);
721 return ISC_R_NOMEMORY;
722 }
723
724 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
725 talloc_free(tmp_ctx);
726 return ISC_R_NOMEMORY;
727 }
728
729 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
730 if (ret == LDB_SUCCESS) {
731 if (zone_dn != NULL) {
732 *zone_dn = talloc_steal(mem_ctx, dn);
733 }
734 talloc_free(tmp_ctx);
735 return ISC_R_SUCCESS;
736 }
737 talloc_free(dn);
738 }
739
740 talloc_free(tmp_ctx);
741 return ISC_R_NOTFOUND;
742 }
743
744
745 /*
746 return the DN for a name. The record does not need to exist, but the
747 zone must exist
748 */
749 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
750 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
751 {
752 const char *p;
753
754 /* work through the name piece by piece, until we find a zone */
755 for (p=name; p; ) {
756 isc_result_t result;
757 result = b9_find_zone_dn(state, p, mem_ctx, dn);
758 if (result == ISC_R_SUCCESS) {
759 /* we found a zone, now extend the DN to get
760 * the full DN
761 */
762 bool ret;
763 if (p == name) {
764 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
765 } else {
766 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
767 }
768 if (!ret) {
769 talloc_free(*dn);
770 return ISC_R_NOMEMORY;
771 }
772 return ISC_R_SUCCESS;
773 }
774 p = strchr(p, '.');
775 if (p == NULL) {
776 break;
777 }
778 p++;
779 }
780 return ISC_R_NOTFOUND;
781 }
782
783
784 /*
785 see if we handle a given zone
786 */
787 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
788 {
789 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
790 return b9_find_zone_dn(state, name, NULL, NULL);
791 }
792
793
794 /*
795 lookup one record
796 */
797 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
798 const char *zone, const char *name,
799 dns_sdlzlookup_t *lookup,
800 const char **types)
801 {
802 TALLOC_CTX *tmp_ctx = talloc_new(state);
803 const char *attrs[] = { "dnsRecord", NULL };
804 int ret = LDB_SUCCESS, i;
805 struct ldb_result *res;
806 struct ldb_message_element *el;
807 struct ldb_dn *dn;
808
809 for (i=0; zone_prefixes[i]; i++) {
810 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
811 if (dn == NULL) {
812 talloc_free(tmp_ctx);
813 return ISC_R_NOMEMORY;
814 }
815
816 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
817 talloc_free(tmp_ctx);
818 return ISC_R_NOMEMORY;
819 }
820
821 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
822 attrs, "objectClass=dnsNode");
823 if (ret == LDB_SUCCESS) {
824 break;
825 }
826 }
827 if (ret != LDB_SUCCESS) {
828 talloc_free(tmp_ctx);
829 return ISC_R_NOTFOUND;
830 }
831
832 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
833 if (el == NULL || el->num_values == 0) {
834 talloc_free(tmp_ctx);
835 return ISC_R_NOTFOUND;
836 }
837
838 for (i=0; i<el->num_values; i++) {
839 struct dnsp_DnssrvRpcRecord rec;
840 enum ndr_err_code ndr_err;
841 isc_result_t result;
842
843 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
844 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
845 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
846 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
847 ldb_dn_get_linearized(dn));
848 talloc_free(tmp_ctx);
849 return ISC_R_FAILURE;
850 }
851
852 result = b9_putrr(state, lookup, &rec, types);
853 if (result != ISC_R_SUCCESS) {
854 talloc_free(tmp_ctx);
855 return result;
856 }
857 }
858
859 talloc_free(tmp_ctx);
860 return ISC_R_SUCCESS;
861 }
862
863 /*
864 lookup one record
865 */
866 #ifdef BIND_VERSION_9_8
867 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
868 void *dbdata, dns_sdlzlookup_t *lookup)
869 #else
870 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
871 void *dbdata, dns_sdlzlookup_t *lookup,
872 dns_clientinfomethods_t *methods,
873 dns_clientinfo_t *clientinfo)
874 #endif
875 {
876 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
877 return dlz_lookup_types(state, zone, name, lookup, NULL);
878 }
879
880
881 /*
882 see if a zone transfer is allowed
883 */
884 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
885 {
886 /* just say yes for all our zones for now */
887 return dlz_findzonedb(dbdata, name);
888 }
889
890 /*
891 perform a zone transfer
892 */
893 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
894 dns_sdlzallnodes_t *allnodes)
895 {
896 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
897 const char *attrs[] = { "dnsRecord", NULL };
898 int ret = LDB_SUCCESS, i, j;
899 struct ldb_dn *dn;
900 struct ldb_result *res;
901 TALLOC_CTX *tmp_ctx = talloc_new(state);
902
903 for (i=0; zone_prefixes[i]; i++) {
904 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
905 if (dn == NULL) {
906 talloc_free(tmp_ctx);
907 return ISC_R_NOMEMORY;
908 }
909
910 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
911 talloc_free(tmp_ctx);
912 return ISC_R_NOMEMORY;
913 }
914
915 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
916 attrs, "objectClass=dnsNode");
917 if (ret == LDB_SUCCESS) {
918 break;
919 }
920 }
921 if (ret != LDB_SUCCESS) {
922 talloc_free(tmp_ctx);
923 return ISC_R_NOTFOUND;
924 }
925
926 for (i=0; i<res->count; i++) {
927 struct ldb_message_element *el;
928 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
929 const char *rdn, *name;
930 const struct ldb_val *v;
931
932 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
933 if (el == NULL || el->num_values == 0) {
934 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
935 ldb_dn_get_linearized(dn));
936 talloc_free(el_ctx);
937 continue;
938 }
939
940 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
941 if (v == NULL) {
942 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
943 ldb_dn_get_linearized(dn));
944 talloc_free(el_ctx);
945 continue;
946 }
947
948 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
949 if (rdn == NULL) {
950 talloc_free(tmp_ctx);
951 return ISC_R_NOMEMORY;
952 }
953
954 if (strcmp(rdn, "@") == 0) {
955 name = zone;
956 } else {
957 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
958 }
959 if (name == NULL) {
960 talloc_free(tmp_ctx);
961 return ISC_R_NOMEMORY;
962 }
963
964 for (j=0; j<el->num_values; j++) {
965 struct dnsp_DnssrvRpcRecord rec;
966 enum ndr_err_code ndr_err;
967 isc_result_t result;
968
969 ndr_err = ndr_pull_struct_blob(&el->values[j], el_ctx, &rec,
970 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
971 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
972 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
973 ldb_dn_get_linearized(dn));
974 continue;
975 }
976
977 result = b9_putnamedrr(state, allnodes, name, &rec);
978 if (result != ISC_R_SUCCESS) {
979 continue;
980 }
981 }
982 }
983
984 talloc_free(tmp_ctx);
985
986 return ISC_R_SUCCESS;
987 }
988
989
990 /*
991 start a transaction
992 */
993 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
994 {
995 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
996
997 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
998
999 if (state->transaction_token != NULL) {
1000 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
1001 return ISC_R_FAILURE;
1002 }
1003
1004 state->transaction_token = talloc_zero(state, int);
1005 if (state->transaction_token == NULL) {
1006 return ISC_R_NOMEMORY;
1007 }
1008
1009 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
1010 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
1011 talloc_free(state->transaction_token);
1012 state->transaction_token = NULL;
1013 return ISC_R_FAILURE;
1014 }
1015
1016 *versionp = (void *)state->transaction_token;
1017
1018 return ISC_R_SUCCESS;
1019 }
1020
1021 /*
1022 end a transaction
1023 */
1024 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1025 void *dbdata, void **versionp)
1026 {
1027 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1028
1029 if (state->transaction_token != (int *)*versionp) {
1030 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1031 return;
1032 }
1033
1034 if (commit) {
1035 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1036 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1037 return;
1038 }
1039 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1040 } else {
1041 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1042 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1043 return;
1044 }
1045 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1046 }
1047
1048 talloc_free(state->transaction_token);
1049 state->transaction_token = NULL;
1050 *versionp = NULL;
1051 }
1052
1053
1054 /*
1055 see if there is a SOA record for a zone
1056 */
1057 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1058 {
1059 const char *attrs[] = { "dnsRecord", NULL };
1060 struct ldb_result *res;
1061 struct ldb_message_element *el;
1062 TALLOC_CTX *tmp_ctx = talloc_new(state);
1063 int ret, i;
1064
1065 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
1066 talloc_free(tmp_ctx);
1067 return false;
1068 }
1069
1070 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1071 attrs, "objectClass=dnsNode");
1072 if (ret != LDB_SUCCESS) {
1073 talloc_free(tmp_ctx);
1074 return false;
1075 }
1076
1077 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1078 if (el == NULL) {
1079 talloc_free(tmp_ctx);
1080 return false;
1081 }
1082 for (i=0; i<el->num_values; i++) {
1083 struct dnsp_DnssrvRpcRecord rec;
1084 enum ndr_err_code ndr_err;
1085
1086 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
1087 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1088 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1089 continue;
1090 }
1091 if (rec.wType == DNS_TYPE_SOA) {
1092 talloc_free(tmp_ctx);
1093 return true;
1094 }
1095 }
1096
1097 talloc_free(tmp_ctx);
1098 return false;
1099 }
1100
1101 /*
1102 configure a writeable zone
1103 */
1104 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1105 {
1106 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1107 TALLOC_CTX *tmp_ctx;
1108 struct ldb_dn *dn;
1109 int i;
1110
1111 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1112 if (state->writeable_zone == NULL) {
1113 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1114 return ISC_R_FAILURE;
1115 }
1116
1117 tmp_ctx = talloc_new(state);
1118
1119 for (i=0; zone_prefixes[i]; i++) {
1120 const char *attrs[] = { "name", NULL };
1121 int j, ret;
1122 struct ldb_result *res;
1123
1124 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1125 if (dn == NULL) {
1126 talloc_free(tmp_ctx);
1127 return ISC_R_NOMEMORY;
1128 }
1129
1130 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1131 talloc_free(tmp_ctx);
1132 return ISC_R_NOMEMORY;
1133 }
1134
1135 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1136 attrs, "objectClass=dnsZone");
1137 if (ret != LDB_SUCCESS) {
1138 continue;
1139 }
1140
1141 for (j=0; j<res->count; j++) {
1142 isc_result_t result;
1143 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1144 struct ldb_dn *zone_dn;
1145
1146 if (zone == NULL) {
1147 continue;
1148 }
1149 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1150 if (zone_dn == NULL) {
1151 talloc_free(tmp_ctx);
1152 return ISC_R_NOMEMORY;
1153 }
1154
1155 if (!b9_has_soa(state, zone_dn, zone)) {
1156 continue;
1157 }
1158 result = state->writeable_zone(view, zone);
1159 if (result != ISC_R_SUCCESS) {
1160 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1161 zone);
1162 talloc_free(tmp_ctx);
1163 return result;
1164 }
1165 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1166 }
1167 }
1168
1169 talloc_free(tmp_ctx);
1170 return ISC_R_SUCCESS;
1171 }
1172
1173 /*
1174 authorize a zone update
1175 */
1176 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1177 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1178 void *dbdata)
1179 {
1180 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1181 TALLOC_CTX *tmp_ctx;
1182 DATA_BLOB ap_req;
1183 struct cli_credentials *server_credentials;
1184 char *keytab_name;
1185 int ret;
1186 int ldb_ret;
1187 NTSTATUS nt_status;
1188 struct gensec_security *gensec_ctx;
1189 struct auth_session_info *session_info;
1190 struct ldb_dn *dn;
1191 isc_result_t result;
1192 struct ldb_result *res;
1193 const char * attrs[] = { NULL };
1194 uint32_t access_mask;
1195
1196 /* Remove cached credentials, if any */
1197 if (state->session_info) {
1198 talloc_free(state->session_info);
1199 state->session_info = NULL;
1200 }
1201 if (state->update_name) {
1202 talloc_free(state->update_name);
1203 state->update_name = NULL;
1204 }
1205
1206 tmp_ctx = talloc_new(NULL);
1207 if (tmp_ctx == NULL) {
1208 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1209 return ISC_FALSE;
1210 }
1211
1212 ap_req = data_blob_const(keydata, keydatalen);
1213 server_credentials = cli_credentials_init(tmp_ctx);
1214 if (!server_credentials) {
1215 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1216 talloc_free(tmp_ctx);
1217 return ISC_FALSE;
1218 }
1219
1220 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1221 cli_credentials_set_conf(server_credentials, state->lp);
1222
1223 keytab_name = talloc_asprintf(tmp_ctx, "file:%s/dns.keytab",
1224 lpcfg_private_dir(state->lp));
1225 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1226 CRED_SPECIFIED);
1227 if (ret != 0) {
1228 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1229 keytab_name);
1230 talloc_free(tmp_ctx);
1231 return ISC_FALSE;
1232 }
1233 talloc_free(keytab_name);
1234
1235 nt_status = gensec_server_start(tmp_ctx,
1236 lpcfg_gensec_settings(tmp_ctx, state->lp),
1237 state->auth_context, &gensec_ctx);
1238 if (!NT_STATUS_IS_OK(nt_status)) {
1239 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1240 talloc_free(tmp_ctx);
1241 return ISC_FALSE;
1242 }
1243
1244 gensec_set_credentials(gensec_ctx, server_credentials);
1245
1246 nt_status = gensec_start_mech_by_name(gensec_ctx, "spnego");
1247 if (!NT_STATUS_IS_OK(nt_status)) {
1248 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1249 talloc_free(tmp_ctx);
1250 return ISC_FALSE;
1251 }
1252
1253 nt_status = gensec_update(gensec_ctx, tmp_ctx, state->ev_ctx, ap_req, &ap_req);
1254 if (!NT_STATUS_IS_OK(nt_status)) {
1255 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1256 talloc_free(tmp_ctx);
1257 return ISC_FALSE;
1258 }
1259
1260 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1261 if (!NT_STATUS_IS_OK(nt_status)) {
1262 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1263 talloc_free(tmp_ctx);
1264 return ISC_FALSE;
1265 }
1266
1267 /* Get the DN from name */
1268 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1269 if (result != ISC_R_SUCCESS) {
1270 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1271 talloc_free(tmp_ctx);
1272 return ISC_FALSE;
1273 }
1274
1275 /* make sure the dn exists, or find parent dn in case new object is being added */
1276 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1277 attrs, "objectClass=dnsNode");
1278 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1279 ldb_dn_remove_child_components(dn, 1);
1280 access_mask = SEC_ADS_CREATE_CHILD;
1281 talloc_free(res);
1282 } else if (ldb_ret == LDB_SUCCESS) {
1283 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1284 talloc_free(res);
1285 } else {
1286 talloc_free(tmp_ctx);
1287 return ISC_FALSE;
1288 }
1289
1290 /* Do ACL check */
1291 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1292 session_info->security_token,
1293 access_mask, NULL);
1294 if (ldb_ret != LDB_SUCCESS) {
1295 state->log(ISC_LOG_INFO,
1296 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1297 signer, name, type, ldb_strerror(ldb_ret));
1298 talloc_free(tmp_ctx);
1299 return ISC_FALSE;
1300 }
1301
1302 /* Cache session_info, so it can be used in the actual add/delete operation */
1303 state->update_name = talloc_strdup(state, name);
1304 if (state->update_name == NULL) {
1305 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1306 talloc_free(tmp_ctx);
1307 return ISC_FALSE;
1308 }
1309 state->session_info = talloc_steal(state, session_info);
1310
1311 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1312 signer, name, tcpaddr, type, key);
1313
1314 talloc_free(tmp_ctx);
1315 return ISC_TRUE;
1316 }
1317
1318
1319 /*
1320 add a new record
1321 */
1322 static isc_result_t b9_add_record(struct dlz_bind9_data *state, const char *name,
1323 struct ldb_dn *dn,
1324 struct dnsp_DnssrvRpcRecord *rec)
1325 {
1326 struct ldb_message *msg;
1327 enum ndr_err_code ndr_err;
1328 struct ldb_val v;
1329 int ret;
1330
1331 msg = ldb_msg_new(rec);
1332 if (msg == NULL) {
1333 return ISC_R_NOMEMORY;
1334 }
1335 msg->dn = dn;
1336 ret = ldb_msg_add_string(msg, "objectClass", "dnsNode");
1337 if (ret != LDB_SUCCESS) {
1338 return ISC_R_FAILURE;
1339 }
1340
1341 ndr_err = ndr_push_struct_blob(&v, rec, rec, (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1342 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1343 return ISC_R_FAILURE;
1344 }
1345 ret = ldb_msg_add_value(msg, "dnsRecord", &v, NULL);
1346 if (ret != LDB_SUCCESS) {
1347 return ISC_R_FAILURE;
1348 }
1349
1350 ret = ldb_add(state->samdb, msg);
1351 if (ret != LDB_SUCCESS) {
1352 return ISC_R_FAILURE;
1353 }
1354
1355 return ISC_R_SUCCESS;
1356 }
1357
1358 /*
1359 see if two DNS names are the same
1360 */
1361 static bool dns_name_equal(const char *name1, const char *name2)
1362 {
1363 size_t len1 = strlen(name1);
1364 size_t len2 = strlen(name2);
1365 if (name1[len1-1] == '.') len1--;
1366 if (name2[len2-1] == '.') len2--;
1367 if (len1 != len2) {
1368 return false;
1369 }
1370 return strncasecmp_m(name1, name2, len1) == 0;
1371 }
1372
1373
1374 /*
1375 see if two dns records match
1376 */
1377 static bool b9_record_match(struct dlz_bind9_data *state,
1378 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1379 {
1380 bool status;
1381 int i;
1382
1383 if (rec1->wType != rec2->wType) {
1384 return false;
1385 }
1386 /* see if this type is single valued */
1387 if (b9_single_valued(rec1->wType)) {
1388 return true;
1389 }
1390
1391 /* see if the data matches */
1392 switch (rec1->wType) {
1393 case DNS_TYPE_A:
1394 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1395 case DNS_TYPE_AAAA:
1396 return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
1397 case DNS_TYPE_CNAME:
1398 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1399 case DNS_TYPE_TXT:
1400 status = (rec1->data.txt.count == rec2->data.txt.count);
1401 if (!status) return status;
1402 for (i=0; i<rec1->data.txt.count; i++) {
1403 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1404 }
1405 return status;
1406 case DNS_TYPE_PTR:
1407 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1408 case DNS_TYPE_NS:
1409 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1410
1411 case DNS_TYPE_SRV:
1412 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1413 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1414 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1415 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1416
1417 case DNS_TYPE_MX:
1418 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1419 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1420
1421 case DNS_TYPE_HINFO:
1422 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1423 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1424
1425 case DNS_TYPE_SOA:
1426 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1427 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1428 rec1->data.soa.serial == rec2->data.soa.serial &&
1429 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1430 rec1->data.soa.retry == rec2->data.soa.retry &&
1431 rec1->data.soa.expire == rec2->data.soa.expire &&
1432 rec1->data.soa.minimum == rec2->data.soa.minimum;
1433 default:
1434 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
1435 rec1->wType);
1436 break;
1437 }
1438
1439 return false;
1440 }
1441
1442 /*
1443 * Update session_info on samdb using the cached credentials
1444 */
1445 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1446 {
1447 int ret;
1448
1449 if (state->update_name == NULL || state->session_info == NULL) {
1450 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1451 return false;
1452 }
1453
1454 /* Do not use client credentials, if we not updating the client specified name */
1455 if (strcmp(state->update_name, name) != 0) {
1456 return true;
1457 }
1458
1459 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1460 if (ret != LDB_SUCCESS) {
1461 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1462 return false;
1463 }
1464
1465 return true;
1466 }
1467
1468 /*
1469 * Reset session_info on samdb as system session
1470 */
1471 static void b9_reset_session_info(struct dlz_bind9_data *state)
1472 {
1473 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1474 }
1475
1476 /*
1477 add or modify a rdataset
1478 */
1479 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1480 {
1481 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1482 struct dnsp_DnssrvRpcRecord *rec;
1483 struct ldb_dn *dn;
1484 isc_result_t result;
1485 struct ldb_result *res;
1486 const char *attrs[] = { "dnsRecord", NULL };
1487 int ret, i;
1488 struct ldb_message_element *el;
1489 enum ndr_err_code ndr_err;
1490 NTTIME t;
1491
1492 if (state->transaction_token != (void*)version) {
1493 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1494 return ISC_R_FAILURE;
1495 }
1496
1497 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1498 if (rec == NULL) {
1499 return ISC_R_NOMEMORY;
1500 }
1501
1502 unix_to_nt_time(&t, time(NULL));
1503 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1504 t /= 3600; /* convert to hours */
1505
1506 rec->rank = DNS_RANK_ZONE;
1507 rec->dwSerial = state->soa_serial;
1508 rec->dwTimeStamp = (uint32_t)t;
1509
1510 if (!b9_parse(state, rdatastr, rec)) {
1511 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1512 talloc_free(rec);
1513 return ISC_R_FAILURE;
1514 }
1515
1516 /* find the DN of the record */
1517 result = b9_find_name_dn(state, name, rec, &dn);
1518 if (result != ISC_R_SUCCESS) {
1519 talloc_free(rec);
1520 return result;
1521 }
1522
1523 /* get any existing records */
1524 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1525 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1526 if (!b9_set_session_info(state, name)) {
1527 talloc_free(rec);
1528 return ISC_R_FAILURE;
1529 }
1530 result = b9_add_record(state, name, dn, rec);
1531 b9_reset_session_info(state);
1532 talloc_free(rec);
1533 if (result == ISC_R_SUCCESS) {
1534 state->log(ISC_LOG_INFO, "samba_dlz: added %s %s", name, rdatastr);
1535 }
1536 return result;
1537 }
1538
1539 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1540 if (el == NULL) {
1541 ret = ldb_msg_add_empty(res->msgs[0], "dnsRecord", LDB_FLAG_MOD_ADD, &el);
1542 if (ret != LDB_SUCCESS) {
1543 state->log(ISC_LOG_ERROR, "samba_dlz: failed to add dnsRecord for %s",
1544 ldb_dn_get_linearized(dn));
1545 talloc_free(rec);
1546 return ISC_R_FAILURE;
1547 }
1548 }
1549
1550 /* there are existing records. We need to see if this will
1551 * replace a record or add to it
1552 */
1553 for (i=0; i<el->num_values; i++) {
1554 struct dnsp_DnssrvRpcRecord rec2;
1555
1556 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1557 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1558 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1559 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1560 ldb_dn_get_linearized(dn));
1561 talloc_free(rec);
1562 return ISC_R_FAILURE;
1563 }
1564
1565 if (b9_record_match(state, rec, &rec2)) {
1566 break;
1567 }
1568 }
1569 if (i == el->num_values) {
1570 /* adding a new value */
1571 el->values = talloc_realloc(el, el->values, struct ldb_val, el->num_values+1);
1572 if (el->values == NULL) {
1573 talloc_free(rec);
1574 return ISC_R_NOMEMORY;
1575 }
1576 el->num_values++;
1577 }
1578
1579 ndr_err = ndr_push_struct_blob(&el->values[i], rec, rec,
1580 (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1581 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1582 state->log(ISC_LOG_ERROR, "samba_dlz: failed to push dnsRecord for %s",
1583 ldb_dn_get_linearized(dn));
1584 talloc_free(rec);
1585 return ISC_R_FAILURE;
1586 }
1587
1588
1589 if (!b9_set_session_info(state, name)) {
1590 talloc_free(rec);
1591 return ISC_R_FAILURE;
1592 }
1593
1594 /* modify the record */
1595 el->flags = LDB_FLAG_MOD_REPLACE;
1596 ret = ldb_modify(state->samdb, res->msgs[0]);
1597 b9_reset_session_info(state);
1598 if (ret != LDB_SUCCESS) {
1599 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1600 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1601 talloc_free(rec);
1602 return ISC_R_FAILURE;
1603 }
1604
1605 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1606
1607 talloc_free(rec);
1608 return ISC_R_SUCCESS;
1609 }
1610
1611 /*
1612 remove a rdataset
1613 */
1614 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1615 {
1616 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1617 struct dnsp_DnssrvRpcRecord *rec;
1618 struct ldb_dn *dn;
1619 isc_result_t result;
1620 struct ldb_result *res;
1621 const char *attrs[] = { "dnsRecord", NULL };
1622 int ret, i;
1623 struct ldb_message_element *el;
1624 enum ndr_err_code ndr_err;
1625
1626 if (state->transaction_token != (void*)version) {
1627 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1628 return ISC_R_FAILURE;
1629 }
1630
1631 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1632 if (rec == NULL) {
1633 return ISC_R_NOMEMORY;
1634 }
1635
1636 if (!b9_parse(state, rdatastr, rec)) {
1637 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1638 talloc_free(rec);
1639 return ISC_R_FAILURE;
1640 }
1641
1642 /* find the DN of the record */
1643 result = b9_find_name_dn(state, name, rec, &dn);
1644 if (result != ISC_R_SUCCESS) {
1645 talloc_free(rec);
1646 return result;
1647 }
1648
1649 /* get the existing records */
1650 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1651 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1652 talloc_free(rec);
1653 return ISC_R_NOTFOUND;
1654 }
1655
1656 /* there are existing records. We need to see if any match
1657 */
1658 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1659 if (el == NULL || el->num_values == 0) {
1660 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1661 ldb_dn_get_linearized(dn));
1662 talloc_free(rec);
1663 return ISC_R_FAILURE;
1664 }
1665
1666 for (i=0; i<el->num_values; i++) {
1667 struct dnsp_DnssrvRpcRecord rec2;
1668
1669 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1670 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1671 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1672 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1673 ldb_dn_get_linearized(dn));
1674 talloc_free(rec);
1675 return ISC_R_FAILURE;
1676 }
1677
1678 if (b9_record_match(state, rec, &rec2)) {
1679 break;
1680 }
1681 }
1682 if (i == el->num_values) {
1683 talloc_free(rec);
1684 return ISC_R_NOTFOUND;
1685 }
1686
1687 if (i < el->num_values-1) {
1688 memmove(&el->values[i], &el->values[i+1], sizeof(el->values[0])*((el->num_values-1)-i));
1689 }
1690 el->num_values--;
1691
1692 if (!b9_set_session_info(state, name)) {
1693 talloc_free(rec);
1694 return ISC_R_FAILURE;
1695 }
1696
1697 if (el->num_values == 0) {
1698 el->flags = LDB_FLAG_MOD_DELETE;
1699 } else {
1700 el->flags = LDB_FLAG_MOD_REPLACE;
1701 }
1702 ret = ldb_modify(state->samdb, res->msgs[0]);
1703
1704 b9_reset_session_info(state);
1705 if (ret != LDB_SUCCESS) {
1706 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1707 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1708 talloc_free(rec);
1709 return ISC_R_FAILURE;
1710 }
1711
1712 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1713
1714 talloc_free(rec);
1715 return ISC_R_SUCCESS;
1716 }
1717
1718
1719 /*
1720 delete all records of the given type
1721 */
1722 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1723 {
1724 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1725 TALLOC_CTX *tmp_ctx;
1726 struct ldb_dn *dn;
1727 isc_result_t result;
1728 struct ldb_result *res;
1729 const char *attrs[] = { "dnsRecord", NULL };
1730 int ret, i;
1731 struct ldb_message_element *el;
1732 enum ndr_err_code ndr_err;
1733 enum dns_record_type dns_type;
1734 bool found = false;
1735
1736 if (state->transaction_token != (void*)version) {
1737 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1738 return ISC_R_FAILURE;
1739 }
1740
1741 if (!b9_dns_type(type, &dns_type)) {
1742 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1743 return ISC_R_FAILURE;
1744 }
1745
1746 tmp_ctx = talloc_new(state);
1747
1748 /* find the DN of the record */
1749 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1750 if (result != ISC_R_SUCCESS) {
1751 talloc_free(tmp_ctx);
1752 return result;
1753 }
1754
1755 /* get the existing records */
1756 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1757 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1758 talloc_free(tmp_ctx);
1759 return ISC_R_NOTFOUND;
1760 }
1761
1762 /* there are existing records. We need to see if any match the type
1763 */
1764 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1765 if (el == NULL || el->num_values == 0) {
1766 talloc_free(tmp_ctx);
1767 return ISC_R_NOTFOUND;
1768 }
1769
1770 for (i=0; i<el->num_values; i++) {
1771 struct dnsp_DnssrvRpcRecord rec2;
1772
1773 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec2,
1774 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1775 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1776 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1777 ldb_dn_get_linearized(dn));
1778 talloc_free(tmp_ctx);
1779 return ISC_R_FAILURE;
1780 }
1781
1782 if (dns_type == rec2.wType) {
1783 if (i < el->num_values-1) {
1784 memmove(&el->values[i], &el->values[i+1],
1785 sizeof(el->values[0])*((el->num_values-1)-i));
1786 }
1787 el->num_values--;
1788 i--;
1789 found = true;
1790 }
1791 }
1792
1793 if (!found) {
1794 talloc_free(tmp_ctx);
1795 return ISC_R_FAILURE;
1796 }
1797
1798 if (!b9_set_session_info(state, name)) {
1799 talloc_free(tmp_ctx);
1800 return ISC_R_FAILURE;
1801 }
1802
1803 if (el->num_values == 0) {
1804 el->flags = LDB_FLAG_MOD_DELETE;
1805 } else {
1806 el->flags = LDB_FLAG_MOD_REPLACE;
1807 }
1808 ret = ldb_modify(state->samdb, res->msgs[0]);
1809
1810 b9_reset_session_info(state);
1811 if (ret != LDB_SUCCESS) {
1812 state->log(ISC_LOG_ERROR, "samba_dlz: failed to delete type %s in %s - %s",
1813 type, ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1814 talloc_free(tmp_ctx);
1815 return ISC_R_FAILURE;
1816 }
1817
1818 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1819
1820 talloc_free(tmp_ctx);
1821 return ISC_R_SUCCESS;
1822 }
reg import