?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dlz_bind9: Fix the named crash on reloading named
[Samba.git] / source4 / dns_server / dlz_bind9.c
blob4be7aaea83eb4c61ef32699b376694f7358bfae3
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 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 }
560
561 /*
562 called to initialise the driver
563 */
564 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
565 unsigned int argc, char *argv[],
566 void **dbdata, ...)
567 {
568 struct dlz_bind9_data *state;
569 const char *helper_name;
570 va_list ap;
571 isc_result_t result;
572 struct ldb_dn *dn;
573 NTSTATUS nt_status;
574
575 if (dlz_bind9_state != NULL) {
576 *dbdata = dlz_bind9_state;
577 dlz_bind9_state_ref_count++;
578 return ISC_R_SUCCESS;
579 }
580
581 state = talloc_zero(NULL, struct dlz_bind9_data);
582 if (state == NULL) {
583 return ISC_R_NOMEMORY;
584 }
585
586 talloc_set_destructor(state, dlz_state_debug_unregister);
587
588 /* fill in the helper functions */
589 va_start(ap, dbdata);
590 while ((helper_name = va_arg(ap, const char *)) != NULL) {
591 b9_add_helper(state, helper_name, va_arg(ap, void*));
592 }
593 va_end(ap);
594
595 /* Do not install samba signal handlers */
596 fault_setup_disable();
597
598 /* Start logging (to the bind9 logs) */
599 debug_set_callback(state, b9_debug);
600
601 state->ev_ctx = s4_event_context_init(state);
602 if (state->ev_ctx == NULL) {
603 result = ISC_R_NOMEMORY;
604 goto failed;
605 }
606
607 result = parse_options(state, argc, argv, &state->options);
608 if (result != ISC_R_SUCCESS) {
609 goto failed;
610 }
611
612 state->lp = loadparm_init_global(true);
613 if (state->lp == NULL) {
614 result = ISC_R_NOMEMORY;
615 goto failed;
616 }
617
618 if (state->options.debug) {
619 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
620 } else {
621 lpcfg_do_global_parameter(state->lp, "log level", "0");
622 }
623
624 if (smb_krb5_init_context(state, state->ev_ctx, state->lp, &state->smb_krb5_ctx) != 0) {
625 result = ISC_R_NOMEMORY;
626 goto failed;
627 }
628
629 nt_status = gensec_init();
630 if (!NT_STATUS_IS_OK(nt_status)) {
631 result = ISC_R_NOMEMORY;
632 goto failed;
633 }
634
635 state->auth_context = talloc_zero(state, struct auth4_context);
636 if (state->auth_context == NULL) {
637 result = ISC_R_NOMEMORY;
638 goto failed;
639 }
640
641 if (state->options.url == NULL) {
642 state->options.url = lpcfg_private_path(state, state->lp, "dns/sam.ldb");
643 if (state->options.url == NULL) {
644 result = ISC_R_NOMEMORY;
645 goto failed;
646 }
647 }
648
649 state->samdb = samdb_connect_url(state, state->ev_ctx, state->lp,
650 system_session(state->lp), 0, state->options.url);
651 if (state->samdb == NULL) {
652 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to connect to %s",
653 state->options.url);
654 result = ISC_R_FAILURE;
655 goto failed;
656 }
657
658 dn = ldb_get_default_basedn(state->samdb);
659 if (dn == NULL) {
660 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
661 state->options.url, ldb_errstring(state->samdb));
662 result = ISC_R_FAILURE;
663 goto failed;
664 }
665
666 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
667 ldb_dn_get_linearized(dn));
668
669 state->auth_context->event_ctx = state->ev_ctx;
670 state->auth_context->lp_ctx = state->lp;
671 state->auth_context->sam_ctx = state->samdb;
672 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
673
674 *dbdata = state;
675 dlz_bind9_state = state;
676 dlz_bind9_state_ref_count++;
677
678 return ISC_R_SUCCESS;
679
680 failed:
681 talloc_free(state);
682 return result;
683 }
684
685 /*
686 shutdown the backend
687 */
688 _PUBLIC_ void dlz_destroy(void *dbdata)
689 {
690 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
691 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
692
693 dlz_bind9_state_ref_count--;
694 if (dlz_bind9_state_ref_count == 0) {
695 talloc_unlink(state, state->samdb);
696 talloc_free(state);
697 dlz_bind9_state = NULL;
698 }
699 }
700
701
702 /*
703 return the base DN for a zone
704 */
705 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
706 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
707 {
708 int ret;
709 TALLOC_CTX *tmp_ctx = talloc_new(state);
710 const char *attrs[] = { NULL };
711 int i;
712
713 for (i=0; zone_prefixes[i]; i++) {
714 struct ldb_dn *dn;
715 struct ldb_result *res;
716
717 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
718 if (dn == NULL) {
719 talloc_free(tmp_ctx);
720 return ISC_R_NOMEMORY;
721 }
722
723 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
724 talloc_free(tmp_ctx);
725 return ISC_R_NOMEMORY;
726 }
727
728 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
729 if (ret == LDB_SUCCESS) {
730 if (zone_dn != NULL) {
731 *zone_dn = talloc_steal(mem_ctx, dn);
732 }
733 talloc_free(tmp_ctx);
734 return ISC_R_SUCCESS;
735 }
736 talloc_free(dn);
737 }
738
739 talloc_free(tmp_ctx);
740 return ISC_R_NOTFOUND;
741 }
742
743
744 /*
745 return the DN for a name. The record does not need to exist, but the
746 zone must exist
747 */
748 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
749 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
750 {
751 const char *p;
752
753 /* work through the name piece by piece, until we find a zone */
754 for (p=name; p; ) {
755 isc_result_t result;
756 result = b9_find_zone_dn(state, p, mem_ctx, dn);
757 if (result == ISC_R_SUCCESS) {
758 /* we found a zone, now extend the DN to get
759 * the full DN
760 */
761 bool ret;
762 if (p == name) {
763 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
764 } else {
765 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
766 }
767 if (!ret) {
768 talloc_free(*dn);
769 return ISC_R_NOMEMORY;
770 }
771 return ISC_R_SUCCESS;
772 }
773 p = strchr(p, '.');
774 if (p == NULL) {
775 break;
776 }
777 p++;
778 }
779 return ISC_R_NOTFOUND;
780 }
781
782
783 /*
784 see if we handle a given zone
785 */
786 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
787 {
788 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
789 return b9_find_zone_dn(state, name, NULL, NULL);
790 }
791
792
793 /*
794 lookup one record
795 */
796 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
797 const char *zone, const char *name,
798 dns_sdlzlookup_t *lookup,
799 const char **types)
800 {
801 TALLOC_CTX *tmp_ctx = talloc_new(state);
802 const char *attrs[] = { "dnsRecord", NULL };
803 int ret = LDB_SUCCESS, i;
804 struct ldb_result *res;
805 struct ldb_message_element *el;
806 struct ldb_dn *dn;
807
808 for (i=0; zone_prefixes[i]; i++) {
809 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
810 if (dn == NULL) {
811 talloc_free(tmp_ctx);
812 return ISC_R_NOMEMORY;
813 }
814
815 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
816 talloc_free(tmp_ctx);
817 return ISC_R_NOMEMORY;
818 }
819
820 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
821 attrs, "objectClass=dnsNode");
822 if (ret == LDB_SUCCESS) {
823 break;
824 }
825 }
826 if (ret != LDB_SUCCESS) {
827 talloc_free(tmp_ctx);
828 return ISC_R_NOTFOUND;
829 }
830
831 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
832 if (el == NULL || el->num_values == 0) {
833 talloc_free(tmp_ctx);
834 return ISC_R_NOTFOUND;
835 }
836
837 for (i=0; i<el->num_values; i++) {
838 struct dnsp_DnssrvRpcRecord rec;
839 enum ndr_err_code ndr_err;
840 isc_result_t result;
841
842 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
843 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
844 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
845 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
846 ldb_dn_get_linearized(dn));
847 talloc_free(tmp_ctx);
848 return ISC_R_FAILURE;
849 }
850
851 result = b9_putrr(state, lookup, &rec, types);
852 if (result != ISC_R_SUCCESS) {
853 talloc_free(tmp_ctx);
854 return result;
855 }
856 }
857
858 talloc_free(tmp_ctx);
859 return ISC_R_SUCCESS;
860 }
861
862 /*
863 lookup one record
864 */
865 #ifdef BIND_VERSION_9_8
866 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
867 void *dbdata, dns_sdlzlookup_t *lookup)
868 #else
869 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
870 void *dbdata, dns_sdlzlookup_t *lookup,
871 dns_clientinfomethods_t *methods,
872 dns_clientinfo_t *clientinfo)
873 #endif
874 {
875 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
876 return dlz_lookup_types(state, zone, name, lookup, NULL);
877 }
878
879
880 /*
881 see if a zone transfer is allowed
882 */
883 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
884 {
885 /* just say yes for all our zones for now */
886 return dlz_findzonedb(dbdata, name);
887 }
888
889 /*
890 perform a zone transfer
891 */
892 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
893 dns_sdlzallnodes_t *allnodes)
894 {
895 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
896 const char *attrs[] = { "dnsRecord", NULL };
897 int ret = LDB_SUCCESS, i, j;
898 struct ldb_dn *dn;
899 struct ldb_result *res;
900 TALLOC_CTX *tmp_ctx = talloc_new(state);
901
902 for (i=0; zone_prefixes[i]; i++) {
903 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
904 if (dn == NULL) {
905 talloc_free(tmp_ctx);
906 return ISC_R_NOMEMORY;
907 }
908
909 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
910 talloc_free(tmp_ctx);
911 return ISC_R_NOMEMORY;
912 }
913
914 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
915 attrs, "objectClass=dnsNode");
916 if (ret == LDB_SUCCESS) {
917 break;
918 }
919 }
920 if (ret != LDB_SUCCESS) {
921 talloc_free(tmp_ctx);
922 return ISC_R_NOTFOUND;
923 }
924
925 for (i=0; i<res->count; i++) {
926 struct ldb_message_element *el;
927 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
928 const char *rdn, *name;
929 const struct ldb_val *v;
930
931 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
932 if (el == NULL || el->num_values == 0) {
933 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
934 ldb_dn_get_linearized(dn));
935 talloc_free(el_ctx);
936 continue;
937 }
938
939 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
940 if (v == NULL) {
941 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
942 ldb_dn_get_linearized(dn));
943 talloc_free(el_ctx);
944 continue;
945 }
946
947 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
948 if (rdn == NULL) {
949 talloc_free(tmp_ctx);
950 return ISC_R_NOMEMORY;
951 }
952
953 if (strcmp(rdn, "@") == 0) {
954 name = zone;
955 } else {
956 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
957 }
958 if (name == NULL) {
959 talloc_free(tmp_ctx);
960 return ISC_R_NOMEMORY;
961 }
962
963 for (j=0; j<el->num_values; j++) {
964 struct dnsp_DnssrvRpcRecord rec;
965 enum ndr_err_code ndr_err;
966 isc_result_t result;
967
968 ndr_err = ndr_pull_struct_blob(&el->values[j], el_ctx, &rec,
969 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
970 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
971 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
972 ldb_dn_get_linearized(dn));
973 continue;
974 }
975
976 result = b9_putnamedrr(state, allnodes, name, &rec);
977 if (result != ISC_R_SUCCESS) {
978 continue;
979 }
980 }
981 }
982
983 talloc_free(tmp_ctx);
984
985 return ISC_R_SUCCESS;
986 }
987
988
989 /*
990 start a transaction
991 */
992 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
993 {
994 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
995
996 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
997
998 if (state->transaction_token != NULL) {
999 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
1000 return ISC_R_FAILURE;
1001 }
1002
1003 state->transaction_token = talloc_zero(state, int);
1004 if (state->transaction_token == NULL) {
1005 return ISC_R_NOMEMORY;
1006 }
1007
1008 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
1009 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
1010 talloc_free(state->transaction_token);
1011 state->transaction_token = NULL;
1012 return ISC_R_FAILURE;
1013 }
1014
1015 *versionp = (void *)state->transaction_token;
1016
1017 return ISC_R_SUCCESS;
1018 }
1019
1020 /*
1021 end a transaction
1022 */
1023 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1024 void *dbdata, void **versionp)
1025 {
1026 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1027
1028 if (state->transaction_token != (int *)*versionp) {
1029 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1030 return;
1031 }
1032
1033 if (commit) {
1034 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1035 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1036 return;
1037 }
1038 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1039 } else {
1040 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1041 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1042 return;
1043 }
1044 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1045 }
1046
1047 talloc_free(state->transaction_token);
1048 state->transaction_token = NULL;
1049 *versionp = NULL;
1050 }
1051
1052
1053 /*
1054 see if there is a SOA record for a zone
1055 */
1056 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1057 {
1058 const char *attrs[] = { "dnsRecord", NULL };
1059 struct ldb_result *res;
1060 struct ldb_message_element *el;
1061 TALLOC_CTX *tmp_ctx = talloc_new(state);
1062 int ret, i;
1063
1064 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
1065 talloc_free(tmp_ctx);
1066 return false;
1067 }
1068
1069 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1070 attrs, "objectClass=dnsNode");
1071 if (ret != LDB_SUCCESS) {
1072 talloc_free(tmp_ctx);
1073 return false;
1074 }
1075
1076 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1077 if (el == NULL) {
1078 talloc_free(tmp_ctx);
1079 return false;
1080 }
1081 for (i=0; i<el->num_values; i++) {
1082 struct dnsp_DnssrvRpcRecord rec;
1083 enum ndr_err_code ndr_err;
1084
1085 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
1086 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1087 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1088 continue;
1089 }
1090 if (rec.wType == DNS_TYPE_SOA) {
1091 talloc_free(tmp_ctx);
1092 return true;
1093 }
1094 }
1095
1096 talloc_free(tmp_ctx);
1097 return false;
1098 }
1099
1100 /*
1101 configure a writeable zone
1102 */
1103 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1104 {
1105 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1106 TALLOC_CTX *tmp_ctx;
1107 struct ldb_dn *dn;
1108 int i;
1109
1110 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1111 if (state->writeable_zone == NULL) {
1112 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1113 return ISC_R_FAILURE;
1114 }
1115
1116 tmp_ctx = talloc_new(state);
1117
1118 for (i=0; zone_prefixes[i]; i++) {
1119 const char *attrs[] = { "name", NULL };
1120 int j, ret;
1121 struct ldb_result *res;
1122
1123 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1124 if (dn == NULL) {
1125 talloc_free(tmp_ctx);
1126 return ISC_R_NOMEMORY;
1127 }
1128
1129 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1130 talloc_free(tmp_ctx);
1131 return ISC_R_NOMEMORY;
1132 }
1133
1134 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1135 attrs, "objectClass=dnsZone");
1136 if (ret != LDB_SUCCESS) {
1137 continue;
1138 }
1139
1140 for (j=0; j<res->count; j++) {
1141 isc_result_t result;
1142 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1143 struct ldb_dn *zone_dn;
1144
1145 if (zone == NULL) {
1146 continue;
1147 }
1148 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1149 if (zone_dn == NULL) {
1150 talloc_free(tmp_ctx);
1151 return ISC_R_NOMEMORY;
1152 }
1153
1154 if (!b9_has_soa(state, zone_dn, zone)) {
1155 continue;
1156 }
1157 result = state->writeable_zone(view, zone);
1158 if (result != ISC_R_SUCCESS) {
1159 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1160 zone);
1161 talloc_free(tmp_ctx);
1162 return result;
1163 }
1164 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1165 }
1166 }
1167
1168 talloc_free(tmp_ctx);
1169 return ISC_R_SUCCESS;
1170 }
1171
1172 /*
1173 authorize a zone update
1174 */
1175 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1176 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1177 void *dbdata)
1178 {
1179 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1180 TALLOC_CTX *tmp_ctx;
1181 DATA_BLOB ap_req;
1182 struct cli_credentials *server_credentials;
1183 char *keytab_name;
1184 int ret;
1185 int ldb_ret;
1186 NTSTATUS nt_status;
1187 struct gensec_security *gensec_ctx;
1188 struct auth_session_info *session_info;
1189 struct ldb_dn *dn;
1190 isc_result_t result;
1191 struct ldb_result *res;
1192 const char * attrs[] = { NULL };
1193 uint32_t access_mask;
1194
1195 /* Remove cached credentials, if any */
1196 if (state->session_info) {
1197 talloc_free(state->session_info);
1198 state->session_info = NULL;
1199 }
1200 if (state->update_name) {
1201 talloc_free(state->update_name);
1202 state->update_name = NULL;
1203 }
1204
1205 tmp_ctx = talloc_new(NULL);
1206 if (tmp_ctx == NULL) {
1207 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1208 return ISC_FALSE;
1209 }
1210
1211 ap_req = data_blob_const(keydata, keydatalen);
1212 server_credentials = cli_credentials_init(tmp_ctx);
1213 if (!server_credentials) {
1214 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1215 talloc_free(tmp_ctx);
1216 return ISC_FALSE;
1217 }
1218
1219 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1220 cli_credentials_set_conf(server_credentials, state->lp);
1221
1222 keytab_name = talloc_asprintf(tmp_ctx, "file:%s/dns.keytab",
1223 lpcfg_private_dir(state->lp));
1224 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1225 CRED_SPECIFIED);
1226 if (ret != 0) {
1227 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1228 keytab_name);
1229 talloc_free(tmp_ctx);
1230 return ISC_FALSE;
1231 }
1232 talloc_free(keytab_name);
1233
1234 nt_status = gensec_server_start(tmp_ctx,
1235 lpcfg_gensec_settings(tmp_ctx, state->lp),
1236 state->auth_context, &gensec_ctx);
1237 if (!NT_STATUS_IS_OK(nt_status)) {
1238 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1239 talloc_free(tmp_ctx);
1240 return ISC_FALSE;
1241 }
1242
1243 gensec_set_credentials(gensec_ctx, server_credentials);
1244
1245 nt_status = gensec_start_mech_by_name(gensec_ctx, "spnego");
1246 if (!NT_STATUS_IS_OK(nt_status)) {
1247 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1248 talloc_free(tmp_ctx);
1249 return ISC_FALSE;
1250 }
1251
1252 nt_status = gensec_update(gensec_ctx, tmp_ctx, state->ev_ctx, ap_req, &ap_req);
1253 if (!NT_STATUS_IS_OK(nt_status)) {
1254 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1255 talloc_free(tmp_ctx);
1256 return ISC_FALSE;
1257 }
1258
1259 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1260 if (!NT_STATUS_IS_OK(nt_status)) {
1261 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1262 talloc_free(tmp_ctx);
1263 return ISC_FALSE;
1264 }
1265
1266 /* Get the DN from name */
1267 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1268 if (result != ISC_R_SUCCESS) {
1269 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1270 talloc_free(tmp_ctx);
1271 return ISC_FALSE;
1272 }
1273
1274 /* make sure the dn exists, or find parent dn in case new object is being added */
1275 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1276 attrs, "objectClass=dnsNode");
1277 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1278 ldb_dn_remove_child_components(dn, 1);
1279 access_mask = SEC_ADS_CREATE_CHILD;
1280 talloc_free(res);
1281 } else if (ldb_ret == LDB_SUCCESS) {
1282 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1283 talloc_free(res);
1284 } else {
1285 talloc_free(tmp_ctx);
1286 return ISC_FALSE;
1287 }
1288
1289 /* Do ACL check */
1290 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1291 session_info->security_token,
1292 access_mask, NULL);
1293 if (ldb_ret != LDB_SUCCESS) {
1294 state->log(ISC_LOG_INFO,
1295 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1296 signer, name, type, ldb_strerror(ldb_ret));
1297 talloc_free(tmp_ctx);
1298 return ISC_FALSE;
1299 }
1300
1301 /* Cache session_info, so it can be used in the actual add/delete operation */
1302 state->update_name = talloc_strdup(state, name);
1303 if (state->update_name == NULL) {
1304 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1305 talloc_free(tmp_ctx);
1306 return ISC_FALSE;
1307 }
1308 state->session_info = talloc_steal(state, session_info);
1309
1310 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1311 signer, name, tcpaddr, type, key);
1312
1313 talloc_free(tmp_ctx);
1314 return ISC_TRUE;
1315 }
1316
1317
1318 /*
1319 add a new record
1320 */
1321 static isc_result_t b9_add_record(struct dlz_bind9_data *state, const char *name,
1322 struct ldb_dn *dn,
1323 struct dnsp_DnssrvRpcRecord *rec)
1324 {
1325 struct ldb_message *msg;
1326 enum ndr_err_code ndr_err;
1327 struct ldb_val v;
1328 int ret;
1329
1330 msg = ldb_msg_new(rec);
1331 if (msg == NULL) {
1332 return ISC_R_NOMEMORY;
1333 }
1334 msg->dn = dn;
1335 ret = ldb_msg_add_string(msg, "objectClass", "dnsNode");
1336 if (ret != LDB_SUCCESS) {
1337 return ISC_R_FAILURE;
1338 }
1339
1340 ndr_err = ndr_push_struct_blob(&v, rec, rec, (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1341 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1342 return ISC_R_FAILURE;
1343 }
1344 ret = ldb_msg_add_value(msg, "dnsRecord", &v, NULL);
1345 if (ret != LDB_SUCCESS) {
1346 return ISC_R_FAILURE;
1347 }
1348
1349 ret = ldb_add(state->samdb, msg);
1350 if (ret != LDB_SUCCESS) {
1351 return ISC_R_FAILURE;
1352 }
1353
1354 return ISC_R_SUCCESS;
1355 }
1356
1357 /*
1358 see if two DNS names are the same
1359 */
1360 static bool dns_name_equal(const char *name1, const char *name2)
1361 {
1362 size_t len1 = strlen(name1);
1363 size_t len2 = strlen(name2);
1364 if (name1[len1-1] == '.') len1--;
1365 if (name2[len2-1] == '.') len2--;
1366 if (len1 != len2) {
1367 return false;
1368 }
1369 return strncasecmp_m(name1, name2, len1) == 0;
1370 }
1371
1372
1373 /*
1374 see if two dns records match
1375 */
1376 static bool b9_record_match(struct dlz_bind9_data *state,
1377 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1378 {
1379 bool status;
1380 int i;
1381
1382 if (rec1->wType != rec2->wType) {
1383 return false;
1384 }
1385 /* see if this type is single valued */
1386 if (b9_single_valued(rec1->wType)) {
1387 return true;
1388 }
1389
1390 /* see if the data matches */
1391 switch (rec1->wType) {
1392 case DNS_TYPE_A:
1393 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1394 case DNS_TYPE_AAAA:
1395 return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
1396 case DNS_TYPE_CNAME:
1397 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1398 case DNS_TYPE_TXT:
1399 status = (rec1->data.txt.count == rec2->data.txt.count);
1400 if (!status) return status;
1401 for (i=0; i<rec1->data.txt.count; i++) {
1402 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1403 }
1404 return status;
1405 case DNS_TYPE_PTR:
1406 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1407 case DNS_TYPE_NS:
1408 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1409
1410 case DNS_TYPE_SRV:
1411 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1412 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1413 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1414 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1415
1416 case DNS_TYPE_MX:
1417 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1418 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1419
1420 case DNS_TYPE_HINFO:
1421 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1422 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1423
1424 case DNS_TYPE_SOA:
1425 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1426 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1427 rec1->data.soa.serial == rec2->data.soa.serial &&
1428 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1429 rec1->data.soa.retry == rec2->data.soa.retry &&
1430 rec1->data.soa.expire == rec2->data.soa.expire &&
1431 rec1->data.soa.minimum == rec2->data.soa.minimum;
1432 default:
1433 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
1434 rec1->wType);
1435 break;
1436 }
1437
1438 return false;
1439 }
1440
1441 /*
1442 * Update session_info on samdb using the cached credentials
1443 */
1444 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1445 {
1446 int ret;
1447
1448 if (state->update_name == NULL || state->session_info == NULL) {
1449 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1450 return false;
1451 }
1452
1453 /* Do not use client credentials, if we not updating the client specified name */
1454 if (strcmp(state->update_name, name) != 0) {
1455 return true;
1456 }
1457
1458 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1459 if (ret != LDB_SUCCESS) {
1460 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1461 return false;
1462 }
1463
1464 return true;
1465 }
1466
1467 /*
1468 * Reset session_info on samdb as system session
1469 */
1470 static void b9_reset_session_info(struct dlz_bind9_data *state)
1471 {
1472 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1473 }
1474
1475 /*
1476 add or modify a rdataset
1477 */
1478 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1479 {
1480 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1481 struct dnsp_DnssrvRpcRecord *rec;
1482 struct ldb_dn *dn;
1483 isc_result_t result;
1484 struct ldb_result *res;
1485 const char *attrs[] = { "dnsRecord", NULL };
1486 int ret, i;
1487 struct ldb_message_element *el;
1488 enum ndr_err_code ndr_err;
1489 NTTIME t;
1490
1491 if (state->transaction_token != (void*)version) {
1492 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1493 return ISC_R_FAILURE;
1494 }
1495
1496 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1497 if (rec == NULL) {
1498 return ISC_R_NOMEMORY;
1499 }
1500
1501 unix_to_nt_time(&t, time(NULL));
1502 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1503 t /= 3600; /* convert to hours */
1504
1505 rec->rank = DNS_RANK_ZONE;
1506 rec->dwSerial = state->soa_serial;
1507 rec->dwTimeStamp = (uint32_t)t;
1508
1509 if (!b9_parse(state, rdatastr, rec)) {
1510 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1511 talloc_free(rec);
1512 return ISC_R_FAILURE;
1513 }
1514
1515 /* find the DN of the record */
1516 result = b9_find_name_dn(state, name, rec, &dn);
1517 if (result != ISC_R_SUCCESS) {
1518 talloc_free(rec);
1519 return result;
1520 }
1521
1522 /* get any existing records */
1523 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1524 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1525 if (!b9_set_session_info(state, name)) {
1526 talloc_free(rec);
1527 return ISC_R_FAILURE;
1528 }
1529 result = b9_add_record(state, name, dn, rec);
1530 b9_reset_session_info(state);
1531 talloc_free(rec);
1532 if (result == ISC_R_SUCCESS) {
1533 state->log(ISC_LOG_INFO, "samba_dlz: added %s %s", name, rdatastr);
1534 }
1535 return result;
1536 }
1537
1538 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1539 if (el == NULL) {
1540 ret = ldb_msg_add_empty(res->msgs[0], "dnsRecord", LDB_FLAG_MOD_ADD, &el);
1541 if (ret != LDB_SUCCESS) {
1542 state->log(ISC_LOG_ERROR, "samba_dlz: failed to add dnsRecord for %s",
1543 ldb_dn_get_linearized(dn));
1544 talloc_free(rec);
1545 return ISC_R_FAILURE;
1546 }
1547 }
1548
1549 /* there are existing records. We need to see if this will
1550 * replace a record or add to it
1551 */
1552 for (i=0; i<el->num_values; i++) {
1553 struct dnsp_DnssrvRpcRecord rec2;
1554
1555 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1556 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1557 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1558 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1559 ldb_dn_get_linearized(dn));
1560 talloc_free(rec);
1561 return ISC_R_FAILURE;
1562 }
1563
1564 if (b9_record_match(state, rec, &rec2)) {
1565 break;
1566 }
1567 }
1568 if (i == el->num_values) {
1569 /* adding a new value */
1570 el->values = talloc_realloc(el, el->values, struct ldb_val, el->num_values+1);
1571 if (el->values == NULL) {
1572 talloc_free(rec);
1573 return ISC_R_NOMEMORY;
1574 }
1575 el->num_values++;
1576 }
1577
1578 ndr_err = ndr_push_struct_blob(&el->values[i], rec, rec,
1579 (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1580 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1581 state->log(ISC_LOG_ERROR, "samba_dlz: failed to push dnsRecord for %s",
1582 ldb_dn_get_linearized(dn));
1583 talloc_free(rec);
1584 return ISC_R_FAILURE;
1585 }
1586
1587
1588 if (!b9_set_session_info(state, name)) {
1589 talloc_free(rec);
1590 return ISC_R_FAILURE;
1591 }
1592
1593 /* modify the record */
1594 el->flags = LDB_FLAG_MOD_REPLACE;
1595 ret = ldb_modify(state->samdb, res->msgs[0]);
1596 b9_reset_session_info(state);
1597 if (ret != LDB_SUCCESS) {
1598 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1599 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1600 talloc_free(rec);
1601 return ISC_R_FAILURE;
1602 }
1603
1604 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1605
1606 talloc_free(rec);
1607 return ISC_R_SUCCESS;
1608 }
1609
1610 /*
1611 remove a rdataset
1612 */
1613 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1614 {
1615 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1616 struct dnsp_DnssrvRpcRecord *rec;
1617 struct ldb_dn *dn;
1618 isc_result_t result;
1619 struct ldb_result *res;
1620 const char *attrs[] = { "dnsRecord", NULL };
1621 int ret, i;
1622 struct ldb_message_element *el;
1623 enum ndr_err_code ndr_err;
1624
1625 if (state->transaction_token != (void*)version) {
1626 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1627 return ISC_R_FAILURE;
1628 }
1629
1630 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1631 if (rec == NULL) {
1632 return ISC_R_NOMEMORY;
1633 }
1634
1635 if (!b9_parse(state, rdatastr, rec)) {
1636 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1637 talloc_free(rec);
1638 return ISC_R_FAILURE;
1639 }
1640
1641 /* find the DN of the record */
1642 result = b9_find_name_dn(state, name, rec, &dn);
1643 if (result != ISC_R_SUCCESS) {
1644 talloc_free(rec);
1645 return result;
1646 }
1647
1648 /* get the existing records */
1649 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1650 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1651 talloc_free(rec);
1652 return ISC_R_NOTFOUND;
1653 }
1654
1655 /* there are existing records. We need to see if any match
1656 */
1657 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1658 if (el == NULL || el->num_values == 0) {
1659 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1660 ldb_dn_get_linearized(dn));
1661 talloc_free(rec);
1662 return ISC_R_FAILURE;
1663 }
1664
1665 for (i=0; i<el->num_values; i++) {
1666 struct dnsp_DnssrvRpcRecord rec2;
1667
1668 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1669 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1670 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1671 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1672 ldb_dn_get_linearized(dn));
1673 talloc_free(rec);
1674 return ISC_R_FAILURE;
1675 }
1676
1677 if (b9_record_match(state, rec, &rec2)) {
1678 break;
1679 }
1680 }
1681 if (i == el->num_values) {
1682 talloc_free(rec);
1683 return ISC_R_NOTFOUND;
1684 }
1685
1686 if (i < el->num_values-1) {
1687 memmove(&el->values[i], &el->values[i+1], sizeof(el->values[0])*((el->num_values-1)-i));
1688 }
1689 el->num_values--;
1690
1691 if (!b9_set_session_info(state, name)) {
1692 talloc_free(rec);
1693 return ISC_R_FAILURE;
1694 }
1695
1696 if (el->num_values == 0) {
1697 el->flags = LDB_FLAG_MOD_DELETE;
1698 } else {
1699 el->flags = LDB_FLAG_MOD_REPLACE;
1700 }
1701 ret = ldb_modify(state->samdb, res->msgs[0]);
1702
1703 b9_reset_session_info(state);
1704 if (ret != LDB_SUCCESS) {
1705 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1706 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1707 talloc_free(rec);
1708 return ISC_R_FAILURE;
1709 }
1710
1711 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1712
1713 talloc_free(rec);
1714 return ISC_R_SUCCESS;
1715 }
1716
1717
1718 /*
1719 delete all records of the given type
1720 */
1721 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1722 {
1723 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1724 TALLOC_CTX *tmp_ctx;
1725 struct ldb_dn *dn;
1726 isc_result_t result;
1727 struct ldb_result *res;
1728 const char *attrs[] = { "dnsRecord", NULL };
1729 int ret, i;
1730 struct ldb_message_element *el;
1731 enum ndr_err_code ndr_err;
1732 enum dns_record_type dns_type;
1733 bool found = false;
1734
1735 if (state->transaction_token != (void*)version) {
1736 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1737 return ISC_R_FAILURE;
1738 }
1739
1740 if (!b9_dns_type(type, &dns_type)) {
1741 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1742 return ISC_R_FAILURE;
1743 }
1744
1745 tmp_ctx = talloc_new(state);
1746
1747 /* find the DN of the record */
1748 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1749 if (result != ISC_R_SUCCESS) {
1750 talloc_free(tmp_ctx);
1751 return result;
1752 }
1753
1754 /* get the existing records */
1755 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1756 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1757 talloc_free(tmp_ctx);
1758 return ISC_R_NOTFOUND;
1759 }
1760
1761 /* there are existing records. We need to see if any match the type
1762 */
1763 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1764 if (el == NULL || el->num_values == 0) {
1765 talloc_free(tmp_ctx);
1766 return ISC_R_NOTFOUND;
1767 }
1768
1769 for (i=0; i<el->num_values; i++) {
1770 struct dnsp_DnssrvRpcRecord rec2;
1771
1772 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec2,
1773 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1774 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1775 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1776 ldb_dn_get_linearized(dn));
1777 talloc_free(tmp_ctx);
1778 return ISC_R_FAILURE;
1779 }
1780
1781 if (dns_type == rec2.wType) {
1782 if (i < el->num_values-1) {
1783 memmove(&el->values[i], &el->values[i+1],
1784 sizeof(el->values[0])*((el->num_values-1)-i));
1785 }
1786 el->num_values--;
1787 i--;
1788 found = true;
1789 }
1790 }
1791
1792 if (!found) {
1793 talloc_free(tmp_ctx);
1794 return ISC_R_FAILURE;
1795 }
1796
1797 if (!b9_set_session_info(state, name)) {
1798 talloc_free(tmp_ctx);
1799 return ISC_R_FAILURE;
1800 }
1801
1802 if (el->num_values == 0) {
1803 el->flags = LDB_FLAG_MOD_DELETE;
1804 } else {
1805 el->flags = LDB_FLAG_MOD_REPLACE;
1806 }
1807 ret = ldb_modify(state->samdb, res->msgs[0]);
1808
1809 b9_reset_session_info(state);
1810 if (ret != LDB_SUCCESS) {
1811 state->log(ISC_LOG_ERROR, "samba_dlz: failed to delete type %s in %s - %s",
1812 type, ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1813 talloc_free(tmp_ctx);
1814 return ISC_R_FAILURE;
1815 }
1816
1817 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1818
1819 talloc_free(tmp_ctx);
1820 return ISC_R_SUCCESS;
1821 }
Samba GIT mirror