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netlogon_creds_cli: Create cli_credentials from netlogon creds ctx
[Samba.git] / source4 / dns_server / dlz_bind9.c
blobcf171cb66086de1b71bd8fa66d04c8c6f253bf1e
1 /*
2 Unix SMB/CIFS implementation.
3
4 bind9 dlz driver for Samba
5
6 Copyright (C) 2010 Andrew Tridgell
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "talloc.h"
24 #include "param/param.h"
25 #include "lib/events/events.h"
26 #include "dsdb/samdb/samdb.h"
27 #include "dsdb/common/util.h"
28 #include "auth/auth.h"
29 #include "auth/session.h"
30 #include "auth/gensec/gensec.h"
31 #include "librpc/gen_ndr/security.h"
32 #include "auth/credentials/credentials.h"
33 #include "system/kerberos.h"
34 #include "auth/kerberos/kerberos.h"
35 #include "gen_ndr/ndr_dnsp.h"
36 #include "gen_ndr/server_id.h"
37 #include "messaging/messaging.h"
38 #include <popt.h>
39 #include "lib/util/dlinklist.h"
40 #include "dlz_minimal.h"
41 #include "dns_server/dnsserver_common.h"
42
43 struct b9_options {
44 const char *url;
45 const char *debug;
46 };
47
48 struct b9_zone {
49 char *name;
50 struct b9_zone *prev, *next;
51 };
52
53 struct dlz_bind9_data {
54 struct b9_options options;
55 struct ldb_context *samdb;
56 struct tevent_context *ev_ctx;
57 struct loadparm_context *lp;
58 int *transaction_token;
59 uint32_t soa_serial;
60 struct b9_zone *zonelist;
61
62 /* Used for dynamic update */
63 struct smb_krb5_context *smb_krb5_ctx;
64 struct auth4_context *auth_context;
65 struct auth_session_info *session_info;
66 char *update_name;
67
68 /* helper functions from the dlz_dlopen driver */
69 log_t *log;
70 dns_sdlz_putrr_t *putrr;
71 dns_sdlz_putnamedrr_t *putnamedrr;
72 dns_dlz_writeablezone_t *writeable_zone;
73 };
74
75 static struct dlz_bind9_data *dlz_bind9_state = NULL;
76 static int dlz_bind9_state_ref_count = 0;
77
78 static const char *zone_prefixes[] = {
79 "CN=MicrosoftDNS,DC=DomainDnsZones",
80 "CN=MicrosoftDNS,DC=ForestDnsZones",
81 "CN=MicrosoftDNS,CN=System",
82 NULL
83 };
84
85 /*
86 return the version of the API
87 */
88 _PUBLIC_ int dlz_version(unsigned int *flags)
89 {
90 return DLZ_DLOPEN_VERSION;
91 }
92
93 /*
94 remember a helper function from the bind9 dlz_dlopen driver
95 */
96 static void b9_add_helper(struct dlz_bind9_data *state, const char *helper_name, void *ptr)
97 {
98 if (strcmp(helper_name, "log") == 0) {
99 state->log = ptr;
100 }
101 if (strcmp(helper_name, "putrr") == 0) {
102 state->putrr = ptr;
103 }
104 if (strcmp(helper_name, "putnamedrr") == 0) {
105 state->putnamedrr = ptr;
106 }
107 if (strcmp(helper_name, "writeable_zone") == 0) {
108 state->writeable_zone = ptr;
109 }
110 }
111
112 /*
113 * Add a trailing '.' if it's missing
114 */
115 static const char *b9_format_fqdn(TALLOC_CTX *mem_ctx, const char *str)
116 {
117 size_t len;
118 const char *tmp;
119
120 if (str == NULL || str[0] == '\0') {
121 return str;
122 }
123
124 len = strlen(str);
125 if (str[len-1] != '.') {
126 tmp = talloc_asprintf(mem_ctx, "%s.", str);
127 } else {
128 tmp = str;
129 }
130 return tmp;
131 }
132
133 /*
134 format a record for bind9
135 */
136 static bool b9_format(struct dlz_bind9_data *state,
137 TALLOC_CTX *mem_ctx,
138 struct dnsp_DnssrvRpcRecord *rec,
139 const char **type, const char **data)
140 {
141 uint32_t i;
142 char *tmp;
143 const char *fqdn;
144
145 switch (rec->wType) {
146 case DNS_TYPE_A:
147 *type = "a";
148 *data = rec->data.ipv4;
149 break;
150
151 case DNS_TYPE_AAAA:
152 *type = "aaaa";
153 *data = rec->data.ipv6;
154 break;
155
156 case DNS_TYPE_CNAME:
157 *type = "cname";
158 *data = b9_format_fqdn(mem_ctx, rec->data.cname);
159 break;
160
161 case DNS_TYPE_TXT:
162 *type = "txt";
163 tmp = talloc_asprintf(mem_ctx, "\"%s\"", rec->data.txt.str[0]);
164 for (i=1; i<rec->data.txt.count; i++) {
165 tmp = talloc_asprintf_append(tmp, " \"%s\"", rec->data.txt.str[i]);
166 }
167 *data = tmp;
168 break;
169
170 case DNS_TYPE_PTR:
171 *type = "ptr";
172 *data = b9_format_fqdn(mem_ctx, rec->data.ptr);
173 break;
174
175 case DNS_TYPE_SRV:
176 *type = "srv";
177 fqdn = b9_format_fqdn(mem_ctx, rec->data.srv.nameTarget);
178 if (fqdn == NULL) {
179 return false;
180 }
181 *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
182 rec->data.srv.wPriority,
183 rec->data.srv.wWeight,
184 rec->data.srv.wPort,
185 fqdn);
186 break;
187
188 case DNS_TYPE_MX:
189 *type = "mx";
190 fqdn = b9_format_fqdn(mem_ctx, rec->data.mx.nameTarget);
191 if (fqdn == NULL) {
192 return false;
193 }
194 *data = talloc_asprintf(mem_ctx, "%u %s",
195 rec->data.mx.wPriority, fqdn);
196 break;
197
198 case DNS_TYPE_HINFO:
199 *type = "hinfo";
200 *data = talloc_asprintf(mem_ctx, "%s %s",
201 rec->data.hinfo.cpu,
202 rec->data.hinfo.os);
203 break;
204
205 case DNS_TYPE_NS:
206 *type = "ns";
207 *data = b9_format_fqdn(mem_ctx, rec->data.ns);
208 break;
209
210 case DNS_TYPE_SOA: {
211 const char *mname;
212 *type = "soa";
213
214 /* we need to fake the authoritative nameserver to
215 * point at ourselves. This is how AD DNS servers
216 * force clients to send updates to the right local DC
217 */
218 mname = talloc_asprintf(mem_ctx, "%s.%s.",
219 lpcfg_netbios_name(state->lp),
220 lpcfg_dnsdomain(state->lp));
221 if (mname == NULL) {
222 return false;
223 }
224 mname = strlower_talloc(mem_ctx, mname);
225 if (mname == NULL) {
226 return false;
227 }
228
229 fqdn = b9_format_fqdn(mem_ctx, rec->data.soa.rname);
230 if (fqdn == NULL) {
231 return false;
232 }
233
234 state->soa_serial = rec->data.soa.serial;
235
236 *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
237 mname, fqdn,
238 rec->data.soa.serial,
239 rec->data.soa.refresh,
240 rec->data.soa.retry,
241 rec->data.soa.expire,
242 rec->data.soa.minimum);
243 break;
244 }
245
246 default:
247 state->log(ISC_LOG_ERROR, "samba_dlz b9_format: unhandled record type %u",
248 rec->wType);
249 return false;
250 }
251
252 return true;
253 }
254
255 static const struct {
256 enum dns_record_type dns_type;
257 const char *typestr;
258 bool single_valued;
259 } dns_typemap[] = {
260 { DNS_TYPE_A, "A" , false},
261 { DNS_TYPE_AAAA, "AAAA" , false},
262 { DNS_TYPE_CNAME, "CNAME" , true},
263 { DNS_TYPE_TXT, "TXT" , false},
264 { DNS_TYPE_PTR, "PTR" , false},
265 { DNS_TYPE_SRV, "SRV" , false},
266 { DNS_TYPE_MX, "MX" , false},
267 { DNS_TYPE_HINFO, "HINFO" , false},
268 { DNS_TYPE_NS, "NS" , false},
269 { DNS_TYPE_SOA, "SOA" , true},
270 };
271
272
273 /*
274 see if a DNS type is single valued
275 */
276 static bool b9_single_valued(enum dns_record_type dns_type)
277 {
278 int i;
279 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
280 if (dns_typemap[i].dns_type == dns_type) {
281 return dns_typemap[i].single_valued;
282 }
283 }
284 return false;
285 }
286
287 /*
288 see if a DNS type is single valued
289 */
290 static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
291 {
292 int i;
293 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
294 if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
295 *dtype = dns_typemap[i].dns_type;
296 return true;
297 }
298 }
299 return false;
300 }
301
302
303 #define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
304 (ret) = strtok_r(str, sep, &saveptr); \
305 if ((ret) == NULL) return false; \
306 } while (0)
307
308 #define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
309 char *istr = strtok_r(str, sep, &saveptr); \
310 if ((istr) == NULL) return false; \
311 (ret) = strtoul(istr, NULL, 10); \
312 } while (0)
313
314 /*
315 parse a record from bind9
316 */
317 static bool b9_parse(struct dlz_bind9_data *state,
318 const char *rdatastr,
319 struct dnsp_DnssrvRpcRecord *rec)
320 {
321 char *full_name, *dclass, *type;
322 char *str, *tmp, *saveptr=NULL;
323 int i;
324
325 str = talloc_strdup(rec, rdatastr);
326 if (str == NULL) {
327 return false;
328 }
329
330 /* parse the SDLZ string form */
331 DNS_PARSE_STR(full_name, str, "\t", saveptr);
332 DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
333 DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
334 DNS_PARSE_STR(type, NULL, "\t", saveptr);
335
336 /* construct the record */
337 for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
338 if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
339 rec->wType = dns_typemap[i].dns_type;
340 break;
341 }
342 }
343 if (i == ARRAY_SIZE(dns_typemap)) {
344 state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
345 type, full_name);
346 return false;
347 }
348
349 switch (rec->wType) {
350 case DNS_TYPE_A:
351 DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
352 break;
353
354 case DNS_TYPE_AAAA:
355 DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
356 break;
357
358 case DNS_TYPE_CNAME:
359 DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
360 break;
361
362 case DNS_TYPE_TXT:
363 rec->data.txt.count = 0;
364 rec->data.txt.str = talloc_array(rec, const char *, rec->data.txt.count);
365 tmp = strtok_r(NULL, "\t", &saveptr);
366 while (tmp) {
367 rec->data.txt.str = talloc_realloc(rec, rec->data.txt.str, const char *,
368 rec->data.txt.count+1);
369 if (tmp[0] == '"') {
370 /* Strip quotes */
371 rec->data.txt.str[rec->data.txt.count] = talloc_strndup(rec, &tmp[1], strlen(tmp)-2);
372 } else {
373 rec->data.txt.str[rec->data.txt.count] = talloc_strdup(rec, tmp);
374 }
375 rec->data.txt.count++;
376 tmp = strtok_r(NULL, " ", &saveptr);
377 }
378 break;
379
380 case DNS_TYPE_PTR:
381 DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
382 break;
383
384 case DNS_TYPE_SRV:
385 DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
386 DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
387 DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
388 DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
389 break;
390
391 case DNS_TYPE_MX:
392 DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
393 DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
394 break;
395
396 case DNS_TYPE_HINFO:
397 DNS_PARSE_STR(rec->data.hinfo.cpu, NULL, " ", saveptr);
398 DNS_PARSE_STR(rec->data.hinfo.os, NULL, " ", saveptr);
399 break;
400
401 case DNS_TYPE_NS:
402 DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
403 break;
404
405 case DNS_TYPE_SOA:
406 DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
407 DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
408 DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
409 DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
410 DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
411 DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
412 DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
413 break;
414
415 default:
416 state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unhandled record type %u",
417 rec->wType);
418 return false;
419 }
420
421 /* we should be at the end of the buffer now */
422 if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
423 state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unexpected data at end of string for '%s'",
424 rdatastr);
425 return false;
426 }
427
428 return true;
429 }
430
431 /*
432 send a resource record to bind9
433 */
434 static isc_result_t b9_putrr(struct dlz_bind9_data *state,
435 void *handle, struct dnsp_DnssrvRpcRecord *rec,
436 const char **types)
437 {
438 isc_result_t result;
439 const char *type, *data;
440 TALLOC_CTX *tmp_ctx = talloc_new(state);
441
442 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
443 return ISC_R_FAILURE;
444 }
445
446 if (data == NULL) {
447 talloc_free(tmp_ctx);
448 return ISC_R_NOMEMORY;
449 }
450
451 if (types) {
452 int i;
453 for (i=0; types[i]; i++) {
454 if (strcmp(types[i], type) == 0) break;
455 }
456 if (types[i] == NULL) {
457 /* skip it */
458 return ISC_R_SUCCESS;
459 }
460 }
461
462 result = state->putrr(handle, type, rec->dwTtlSeconds, data);
463 if (result != ISC_R_SUCCESS) {
464 state->log(ISC_LOG_ERROR, "Failed to put rr");
465 }
466 talloc_free(tmp_ctx);
467 return result;
468 }
469
470
471 /*
472 send a named resource record to bind9
473 */
474 static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
475 void *handle, const char *name,
476 struct dnsp_DnssrvRpcRecord *rec)
477 {
478 isc_result_t result;
479 const char *type, *data;
480 TALLOC_CTX *tmp_ctx = talloc_new(state);
481
482 if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
483 return ISC_R_FAILURE;
484 }
485
486 if (data == NULL) {
487 talloc_free(tmp_ctx);
488 return ISC_R_NOMEMORY;
489 }
490
491 result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
492 if (result != ISC_R_SUCCESS) {
493 state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
494 }
495 talloc_free(tmp_ctx);
496 return result;
497 }
498
499 /*
500 parse options
501 */
502 static isc_result_t parse_options(struct dlz_bind9_data *state,
503 unsigned int argc, const char **argv,
504 struct b9_options *options)
505 {
506 int opt;
507 poptContext pc;
508 struct poptOption long_options[] = {
509 { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
510 { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
511 { NULL }
512 };
513
514 pc = poptGetContext("dlz_bind9", argc, argv, long_options,
515 POPT_CONTEXT_KEEP_FIRST);
516 while ((opt = poptGetNextOpt(pc)) != -1) {
517 switch (opt) {
518 default:
519 state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
520 poptBadOption(pc, 0), poptStrerror(opt));
521 return ISC_R_FAILURE;
522 }
523 }
524
525 return ISC_R_SUCCESS;
526 }
527
528
529 /*
530 * Create session info from PAC
531 * This is called as auth_context->generate_session_info_pac()
532 */
533 static NTSTATUS b9_generate_session_info_pac(struct auth4_context *auth_context,
534 TALLOC_CTX *mem_ctx,
535 struct smb_krb5_context *smb_krb5_context,
536 DATA_BLOB *pac_blob,
537 const char *principal_name,
538 const struct tsocket_address *remote_addr,
539 uint32_t session_info_flags,
540 struct auth_session_info **session_info)
541 {
542 NTSTATUS status;
543 struct auth_user_info_dc *user_info_dc;
544 TALLOC_CTX *tmp_ctx;
545
546 tmp_ctx = talloc_new(mem_ctx);
547 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
548
549 status = kerberos_pac_blob_to_user_info_dc(tmp_ctx,
550 *pac_blob,
551 smb_krb5_context->krb5_context,
552 &user_info_dc,
553 NULL,
554 NULL);
555 if (!NT_STATUS_IS_OK(status)) {
556 talloc_free(tmp_ctx);
557 return status;
558 }
559
560 if (user_info_dc->info->authenticated) {
561 session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
562 }
563
564 session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
565
566 status = auth_generate_session_info(mem_ctx, NULL, NULL, user_info_dc,
567 session_info_flags, session_info);
568 if (!NT_STATUS_IS_OK(status)) {
569 talloc_free(tmp_ctx);
570 return status;
571 }
572
573 talloc_free(tmp_ctx);
574 return status;
575 }
576
577 /* Callback for the DEBUG() system, to catch the remaining messages */
578 static void b9_debug(void *private_ptr, int msg_level, const char *msg)
579 {
580 static const int isc_log_map[] = {
581 ISC_LOG_CRITICAL, /* 0 */
582 ISC_LOG_ERROR, /* 1 */
583 ISC_LOG_WARNING, /* 2 */
584 ISC_LOG_NOTICE /* 3 */
585 };
586 struct dlz_bind9_data *state = private_ptr;
587 int isc_log_level;
588
589 if (msg_level >= ARRAY_SIZE(isc_log_map) || msg_level < 0) {
590 isc_log_level = ISC_LOG_INFO;
591 } else {
592 isc_log_level = isc_log_map[msg_level];
593 }
594 state->log(isc_log_level, "samba_dlz: %s", msg);
595 }
596
597 static int dlz_state_debug_unregister(struct dlz_bind9_data *state)
598 {
599 /* Stop logging (to the bind9 logs) */
600 debug_set_callback(NULL, NULL);
601 return 0;
602 }
603
604 /*
605 called to initialise the driver
606 */
607 _PUBLIC_ isc_result_t dlz_create(const char *dlzname,
608 unsigned int argc, const char **argv,
609 void **dbdata, ...)
610 {
611 struct dlz_bind9_data *state;
612 const char *helper_name;
613 va_list ap;
614 isc_result_t result;
615 struct ldb_dn *dn;
616 NTSTATUS nt_status;
617 int ret;
618 char *errstring = NULL;
619
620 if (dlz_bind9_state != NULL) {
621 *dbdata = dlz_bind9_state;
622 dlz_bind9_state_ref_count++;
623 return ISC_R_SUCCESS;
624 }
625
626 state = talloc_zero(NULL, struct dlz_bind9_data);
627 if (state == NULL) {
628 return ISC_R_NOMEMORY;
629 }
630
631 talloc_set_destructor(state, dlz_state_debug_unregister);
632
633 /* fill in the helper functions */
634 va_start(ap, dbdata);
635 while ((helper_name = va_arg(ap, const char *)) != NULL) {
636 b9_add_helper(state, helper_name, va_arg(ap, void*));
637 }
638 va_end(ap);
639
640 /* Do not install samba signal handlers */
641 fault_setup_disable();
642
643 /* Start logging (to the bind9 logs) */
644 debug_set_callback(state, b9_debug);
645
646 state->ev_ctx = s4_event_context_init(state);
647 if (state->ev_ctx == NULL) {
648 result = ISC_R_NOMEMORY;
649 goto failed;
650 }
651
652 result = parse_options(state, argc, argv, &state->options);
653 if (result != ISC_R_SUCCESS) {
654 goto failed;
655 }
656
657 state->lp = loadparm_init_global(true);
658 if (state->lp == NULL) {
659 result = ISC_R_NOMEMORY;
660 goto failed;
661 }
662
663 if (state->options.debug) {
664 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
665 } else {
666 lpcfg_do_global_parameter(state->lp, "log level", "0");
667 }
668
669 if (smb_krb5_init_context(state, state->lp, &state->smb_krb5_ctx) != 0) {
670 result = ISC_R_NOMEMORY;
671 goto failed;
672 }
673
674 nt_status = gensec_init();
675 if (!NT_STATUS_IS_OK(nt_status)) {
676 result = ISC_R_NOMEMORY;
677 goto failed;
678 }
679
680 state->auth_context = talloc_zero(state, struct auth4_context);
681 if (state->auth_context == NULL) {
682 result = ISC_R_NOMEMORY;
683 goto failed;
684 }
685
686 if (state->options.url == NULL) {
687 state->options.url = talloc_asprintf(state,
688 "%s/dns/sam.ldb",
689 lpcfg_binddns_dir(state->lp));
690 if (state->options.url == NULL) {
691 result = ISC_R_NOMEMORY;
692 goto failed;
693 }
694
695 if (!file_exist(state->options.url)) {
696 state->options.url = talloc_asprintf(state,
697 "%s/dns/sam.ldb",
698 lpcfg_private_dir(state->lp));
699 if (state->options.url == NULL) {
700 result = ISC_R_NOMEMORY;
701 goto failed;
702 }
703 }
704 }
705
706 ret = samdb_connect_url(state, state->ev_ctx, state->lp,
707 system_session(state->lp), 0,
708 state->options.url,
709 &state->samdb, &errstring);
710 if (ret != LDB_SUCCESS) {
711 state->log(ISC_LOG_ERROR,
712 "samba_dlz: Failed to connect to %s: %s",
713 errstring, ldb_strerror(ret));
714 result = ISC_R_FAILURE;
715 goto failed;
716 }
717
718 dn = ldb_get_default_basedn(state->samdb);
719 if (dn == NULL) {
720 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
721 state->options.url, ldb_errstring(state->samdb));
722 result = ISC_R_FAILURE;
723 goto failed;
724 }
725
726 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
727 ldb_dn_get_linearized(dn));
728
729 state->auth_context->event_ctx = state->ev_ctx;
730 state->auth_context->lp_ctx = state->lp;
731 state->auth_context->sam_ctx = state->samdb;
732 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
733
734 *dbdata = state;
735 dlz_bind9_state = state;
736 dlz_bind9_state_ref_count++;
737
738 return ISC_R_SUCCESS;
739
740 failed:
741 talloc_free(state);
742 return result;
743 }
744
745 /*
746 shutdown the backend
747 */
748 _PUBLIC_ void dlz_destroy(void *dbdata)
749 {
750 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
751 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
752
753 dlz_bind9_state_ref_count--;
754 if (dlz_bind9_state_ref_count == 0) {
755 talloc_unlink(state, state->samdb);
756 talloc_free(state);
757 dlz_bind9_state = NULL;
758 }
759 }
760
761
762 /*
763 return the base DN for a zone
764 */
765 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
766 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
767 {
768 int ret;
769 TALLOC_CTX *tmp_ctx = talloc_new(state);
770 const char *attrs[] = { NULL };
771 int i;
772
773 for (i=0; zone_prefixes[i]; i++) {
774 struct ldb_dn *dn;
775 struct ldb_result *res;
776
777 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
778 if (dn == NULL) {
779 talloc_free(tmp_ctx);
780 return ISC_R_NOMEMORY;
781 }
782
783 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
784 talloc_free(tmp_ctx);
785 return ISC_R_NOMEMORY;
786 }
787
788 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
789 if (ret == LDB_SUCCESS) {
790 if (zone_dn != NULL) {
791 *zone_dn = talloc_steal(mem_ctx, dn);
792 }
793 talloc_free(tmp_ctx);
794 return ISC_R_SUCCESS;
795 }
796 talloc_free(dn);
797 }
798
799 talloc_free(tmp_ctx);
800 return ISC_R_NOTFOUND;
801 }
802
803
804 /*
805 return the DN for a name. The record does not need to exist, but the
806 zone must exist
807 */
808 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
809 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
810 {
811 const char *p;
812
813 /* work through the name piece by piece, until we find a zone */
814 for (p=name; p; ) {
815 isc_result_t result;
816 result = b9_find_zone_dn(state, p, mem_ctx, dn);
817 if (result == ISC_R_SUCCESS) {
818 /* we found a zone, now extend the DN to get
819 * the full DN
820 */
821 bool ret;
822 if (p == name) {
823 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
824 } else {
825 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
826 }
827 if (!ret) {
828 talloc_free(*dn);
829 return ISC_R_NOMEMORY;
830 }
831 return ISC_R_SUCCESS;
832 }
833 p = strchr(p, '.');
834 if (p == NULL) {
835 break;
836 }
837 p++;
838 }
839 return ISC_R_NOTFOUND;
840 }
841
842
843 /*
844 see if we handle a given zone
845 */
846 #if DLZ_DLOPEN_VERSION < 3
847 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
848 #else
849 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name,
850 dns_clientinfomethods_t *methods,
851 dns_clientinfo_t *clientinfo)
852 #endif
853 {
854 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
855 return b9_find_zone_dn(state, name, NULL, NULL);
856 }
857
858
859 /*
860 lookup one record
861 */
862 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
863 const char *zone, const char *name,
864 dns_sdlzlookup_t *lookup,
865 const char **types)
866 {
867 TALLOC_CTX *tmp_ctx = talloc_new(state);
868 struct ldb_dn *dn;
869 WERROR werr = WERR_DNS_ERROR_NAME_DOES_NOT_EXIST;
870 struct dnsp_DnssrvRpcRecord *records = NULL;
871 uint16_t num_records = 0, i;
872
873 for (i=0; zone_prefixes[i]; i++) {
874 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
875 if (dn == NULL) {
876 talloc_free(tmp_ctx);
877 return ISC_R_NOMEMORY;
878 }
879
880 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
881 talloc_free(tmp_ctx);
882 return ISC_R_NOMEMORY;
883 }
884
885 werr = dns_common_wildcard_lookup(state->samdb, tmp_ctx, dn,
886 &records, &num_records);
887 if (W_ERROR_IS_OK(werr)) {
888 break;
889 }
890 }
891 if (!W_ERROR_IS_OK(werr)) {
892 talloc_free(tmp_ctx);
893 return ISC_R_NOTFOUND;
894 }
895
896 for (i=0; i < num_records; i++) {
897 isc_result_t result;
898
899 result = b9_putrr(state, lookup, &records[i], types);
900 if (result != ISC_R_SUCCESS) {
901 talloc_free(tmp_ctx);
902 return result;
903 }
904 }
905
906 talloc_free(tmp_ctx);
907 return ISC_R_SUCCESS;
908 }
909
910 /*
911 lookup one record
912 */
913 #if DLZ_DLOPEN_VERSION == 1
914 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
915 void *dbdata, dns_sdlzlookup_t *lookup)
916 #else
917 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
918 void *dbdata, dns_sdlzlookup_t *lookup,
919 dns_clientinfomethods_t *methods,
920 dns_clientinfo_t *clientinfo)
921 #endif
922 {
923 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
924 return dlz_lookup_types(state, zone, name, lookup, NULL);
925 }
926
927
928 /*
929 see if a zone transfer is allowed
930 */
931 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
932 {
933 /* just say yes for all our zones for now */
934 struct dlz_bind9_data *state = talloc_get_type(
935 dbdata, struct dlz_bind9_data);
936 return b9_find_zone_dn(state, name, NULL, NULL);
937 }
938
939 /*
940 perform a zone transfer
941 */
942 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
943 dns_sdlzallnodes_t *allnodes)
944 {
945 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
946 const char *attrs[] = { "dnsRecord", NULL };
947 int ret = LDB_SUCCESS, i, j;
948 struct ldb_dn *dn;
949 struct ldb_result *res;
950 TALLOC_CTX *tmp_ctx = talloc_new(state);
951
952 for (i=0; zone_prefixes[i]; i++) {
953 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
954 if (dn == NULL) {
955 talloc_free(tmp_ctx);
956 return ISC_R_NOMEMORY;
957 }
958
959 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
960 talloc_free(tmp_ctx);
961 return ISC_R_NOMEMORY;
962 }
963
964 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
965 attrs, "objectClass=dnsNode");
966 if (ret == LDB_SUCCESS) {
967 break;
968 }
969 }
970 if (ret != LDB_SUCCESS) {
971 talloc_free(tmp_ctx);
972 return ISC_R_NOTFOUND;
973 }
974
975 for (i=0; i<res->count; i++) {
976 struct ldb_message_element *el;
977 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
978 const char *rdn, *name;
979 const struct ldb_val *v;
980 WERROR werr;
981 struct dnsp_DnssrvRpcRecord *recs = NULL;
982 uint16_t num_recs = 0;
983
984 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
985 if (el == NULL || el->num_values == 0) {
986 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
987 ldb_dn_get_linearized(dn));
988 talloc_free(el_ctx);
989 continue;
990 }
991
992 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
993 if (v == NULL) {
994 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
995 ldb_dn_get_linearized(dn));
996 talloc_free(el_ctx);
997 continue;
998 }
999
1000 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
1001 if (rdn == NULL) {
1002 talloc_free(tmp_ctx);
1003 return ISC_R_NOMEMORY;
1004 }
1005
1006 if (strcmp(rdn, "@") == 0) {
1007 name = zone;
1008 } else {
1009 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
1010 }
1011 name = b9_format_fqdn(el_ctx, name);
1012 if (name == NULL) {
1013 talloc_free(tmp_ctx);
1014 return ISC_R_NOMEMORY;
1015 }
1016
1017 werr = dns_common_extract(state->samdb, el, el_ctx, &recs, &num_recs);
1018 if (!W_ERROR_IS_OK(werr)) {
1019 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
1020 ldb_dn_get_linearized(dn), win_errstr(werr));
1021 talloc_free(el_ctx);
1022 continue;
1023 }
1024
1025 for (j=0; j < num_recs; j++) {
1026 isc_result_t result;
1027
1028 result = b9_putnamedrr(state, allnodes, name, &recs[j]);
1029 if (result != ISC_R_SUCCESS) {
1030 continue;
1031 }
1032 }
1033
1034 talloc_free(el_ctx);
1035 }
1036
1037 talloc_free(tmp_ctx);
1038
1039 return ISC_R_SUCCESS;
1040 }
1041
1042
1043 /*
1044 start a transaction
1045 */
1046 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
1047 {
1048 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1049
1050 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
1051
1052 if (state->transaction_token != NULL) {
1053 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
1054 return ISC_R_FAILURE;
1055 }
1056
1057 state->transaction_token = talloc_zero(state, int);
1058 if (state->transaction_token == NULL) {
1059 return ISC_R_NOMEMORY;
1060 }
1061
1062 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
1063 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
1064 talloc_free(state->transaction_token);
1065 state->transaction_token = NULL;
1066 return ISC_R_FAILURE;
1067 }
1068
1069 *versionp = (void *)state->transaction_token;
1070
1071 return ISC_R_SUCCESS;
1072 }
1073
1074 /*
1075 end a transaction
1076 */
1077 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1078 void *dbdata, void **versionp)
1079 {
1080 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1081
1082 if (state->transaction_token != (int *)*versionp) {
1083 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1084 return;
1085 }
1086
1087 if (commit) {
1088 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1089 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1090 return;
1091 }
1092 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1093 } else {
1094 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1095 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1096 return;
1097 }
1098 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1099 }
1100
1101 talloc_free(state->transaction_token);
1102 state->transaction_token = NULL;
1103 *versionp = NULL;
1104 }
1105
1106
1107 /*
1108 see if there is a SOA record for a zone
1109 */
1110 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1111 {
1112 TALLOC_CTX *tmp_ctx = talloc_new(state);
1113 WERROR werr;
1114 struct dnsp_DnssrvRpcRecord *records = NULL;
1115 uint16_t num_records = 0, i;
1116
1117 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
1118 talloc_free(tmp_ctx);
1119 return false;
1120 }
1121
1122 werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
1123 &records, &num_records, NULL);
1124 if (!W_ERROR_IS_OK(werr)) {
1125 talloc_free(tmp_ctx);
1126 return false;
1127 }
1128
1129 for (i=0; i < num_records; i++) {
1130 if (records[i].wType == DNS_TYPE_SOA) {
1131 talloc_free(tmp_ctx);
1132 return true;
1133 }
1134 }
1135
1136 talloc_free(tmp_ctx);
1137 return false;
1138 }
1139
1140 static bool b9_zone_add(struct dlz_bind9_data *state, const char *name)
1141 {
1142 struct b9_zone *zone;
1143
1144 zone = talloc_zero(state, struct b9_zone);
1145 if (zone == NULL) {
1146 return false;
1147 }
1148
1149 zone->name = talloc_strdup(zone, name);
1150 if (zone->name == NULL) {
1151 talloc_free(zone);
1152 return false;
1153 }
1154
1155 DLIST_ADD(state->zonelist, zone);
1156 return true;
1157 }
1158
1159 static bool b9_zone_exists(struct dlz_bind9_data *state, const char *name)
1160 {
1161 struct b9_zone *zone = state->zonelist;
1162 bool found = false;
1163
1164 while (zone != NULL) {
1165 if (strcasecmp(name, zone->name) == 0) {
1166 found = true;
1167 break;
1168 }
1169 zone = zone->next;
1170 }
1171
1172 return found;
1173 }
1174
1175
1176 /*
1177 configure a writeable zone
1178 */
1179 #if DLZ_DLOPEN_VERSION < 3
1180 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1181 #else
1182 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, dns_dlzdb_t *dlzdb,
1183 void *dbdata)
1184 #endif
1185 {
1186 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1187 TALLOC_CTX *tmp_ctx;
1188 struct ldb_dn *dn;
1189 int i;
1190
1191 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1192 if (state->writeable_zone == NULL) {
1193 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1194 return ISC_R_FAILURE;
1195 }
1196
1197 tmp_ctx = talloc_new(state);
1198
1199 for (i=0; zone_prefixes[i]; i++) {
1200 const char *attrs[] = { "name", NULL };
1201 int j, ret;
1202 struct ldb_result *res;
1203
1204 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1205 if (dn == NULL) {
1206 talloc_free(tmp_ctx);
1207 return ISC_R_NOMEMORY;
1208 }
1209
1210 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1211 talloc_free(tmp_ctx);
1212 return ISC_R_NOMEMORY;
1213 }
1214
1215 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1216 attrs, "objectClass=dnsZone");
1217 if (ret != LDB_SUCCESS) {
1218 continue;
1219 }
1220
1221 for (j=0; j<res->count; j++) {
1222 isc_result_t result;
1223 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1224 struct ldb_dn *zone_dn;
1225
1226 if (zone == NULL) {
1227 continue;
1228 }
1229 /* Ignore zones that are not handled in BIND */
1230 if ((strcmp(zone, "RootDNSServers") == 0) ||
1231 (strcmp(zone, "..TrustAnchors") == 0)) {
1232 continue;
1233 }
1234 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1235 if (zone_dn == NULL) {
1236 talloc_free(tmp_ctx);
1237 return ISC_R_NOMEMORY;
1238 }
1239
1240 if (!b9_has_soa(state, zone_dn, zone)) {
1241 continue;
1242 }
1243
1244 if (b9_zone_exists(state, zone)) {
1245 state->log(ISC_LOG_WARNING, "samba_dlz: Ignoring duplicate zone '%s' from '%s'",
1246 zone, ldb_dn_get_linearized(zone_dn));
1247 continue;
1248 }
1249
1250 if (!b9_zone_add(state, zone)) {
1251 talloc_free(tmp_ctx);
1252 return ISC_R_NOMEMORY;
1253 }
1254
1255 #if DLZ_DLOPEN_VERSION < 3
1256 result = state->writeable_zone(view, zone);
1257 #else
1258 result = state->writeable_zone(view, dlzdb, zone);
1259 #endif
1260 if (result != ISC_R_SUCCESS) {
1261 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1262 zone);
1263 talloc_free(tmp_ctx);
1264 return result;
1265 }
1266 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1267 }
1268 }
1269
1270 talloc_free(tmp_ctx);
1271 return ISC_R_SUCCESS;
1272 }
1273
1274 /*
1275 authorize a zone update
1276 */
1277 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1278 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1279 void *dbdata)
1280 {
1281 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1282 TALLOC_CTX *tmp_ctx;
1283 DATA_BLOB ap_req;
1284 struct cli_credentials *server_credentials;
1285 char *keytab_name;
1286 char *keytab_file = NULL;
1287 int ret;
1288 int ldb_ret;
1289 NTSTATUS nt_status;
1290 struct gensec_security *gensec_ctx;
1291 struct auth_session_info *session_info;
1292 struct ldb_dn *dn;
1293 isc_result_t result;
1294 struct ldb_result *res;
1295 const char * attrs[] = { NULL };
1296 uint32_t access_mask;
1297 struct gensec_settings *settings = NULL;
1298 const struct gensec_security_ops **backends = NULL;
1299 size_t idx = 0;
1300
1301 /* Remove cached credentials, if any */
1302 if (state->session_info) {
1303 talloc_free(state->session_info);
1304 state->session_info = NULL;
1305 }
1306 if (state->update_name) {
1307 talloc_free(state->update_name);
1308 state->update_name = NULL;
1309 }
1310
1311 tmp_ctx = talloc_new(NULL);
1312 if (tmp_ctx == NULL) {
1313 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1314 return ISC_FALSE;
1315 }
1316
1317 ap_req = data_blob_const(keydata, keydatalen);
1318 server_credentials = cli_credentials_init(tmp_ctx);
1319 if (!server_credentials) {
1320 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1321 talloc_free(tmp_ctx);
1322 return ISC_FALSE;
1323 }
1324
1325 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1326 cli_credentials_set_conf(server_credentials, state->lp);
1327
1328 keytab_file = talloc_asprintf(tmp_ctx,
1329 "%s/dns.keytab",
1330 lpcfg_binddns_dir(state->lp));
1331 if (keytab_file == NULL) {
1332 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1333 talloc_free(tmp_ctx);
1334 return ISC_FALSE;
1335 }
1336
1337 if (!file_exist(keytab_file)) {
1338 keytab_file = talloc_asprintf(tmp_ctx,
1339 "%s/dns.keytab",
1340 lpcfg_private_dir(state->lp));
1341 if (keytab_file == NULL) {
1342 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1343 talloc_free(tmp_ctx);
1344 return ISC_FALSE;
1345 }
1346 }
1347
1348 keytab_name = talloc_asprintf(tmp_ctx, "FILE:%s", keytab_file);
1349 if (keytab_name == NULL) {
1350 state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
1351 talloc_free(tmp_ctx);
1352 return ISC_FALSE;
1353 }
1354
1355 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1356 CRED_SPECIFIED);
1357 if (ret != 0) {
1358 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1359 keytab_name);
1360 talloc_free(tmp_ctx);
1361 return ISC_FALSE;
1362 }
1363 talloc_free(keytab_name);
1364
1365 settings = lpcfg_gensec_settings(tmp_ctx, state->lp);
1366 if (settings == NULL) {
1367 state->log(ISC_LOG_ERROR, "samba_dlz: lpcfg_gensec_settings failed");
1368 talloc_free(tmp_ctx);
1369 return ISC_FALSE;
1370 }
1371 backends = talloc_zero_array(settings,
1372 const struct gensec_security_ops *, 3);
1373 if (backends == NULL) {
1374 state->log(ISC_LOG_ERROR, "samba_dlz: talloc_zero_array gensec_security_ops failed");
1375 talloc_free(tmp_ctx);
1376 return ISC_FALSE;
1377 }
1378 settings->backends = backends;
1379
1380 gensec_init();
1381
1382 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_KERBEROS5);
1383 backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_SPNEGO);
1384
1385 nt_status = gensec_server_start(tmp_ctx, settings,
1386 state->auth_context, &gensec_ctx);
1387 if (!NT_STATUS_IS_OK(nt_status)) {
1388 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1389 talloc_free(tmp_ctx);
1390 return ISC_FALSE;
1391 }
1392
1393 gensec_set_credentials(gensec_ctx, server_credentials);
1394
1395 nt_status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
1396 if (!NT_STATUS_IS_OK(nt_status)) {
1397 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1398 talloc_free(tmp_ctx);
1399 return ISC_FALSE;
1400 }
1401
1402 /*
1403 * We only allow SPNEGO/KRB5 and make sure the backend
1404 * to is RPC/IPC free.
1405 *
1406 * See gensec_gssapi_update_internal() as
1407 * GENSEC_SERVER.
1408 *
1409 * It allows gensec_update() not to block.
1410 *
1411 * If that changes in future we need to use
1412 * gensec_update_send/recv here!
1413 */
1414 nt_status = gensec_update(gensec_ctx, tmp_ctx, ap_req, &ap_req);
1415 if (!NT_STATUS_IS_OK(nt_status)) {
1416 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1417 talloc_free(tmp_ctx);
1418 return ISC_FALSE;
1419 }
1420
1421 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1422 if (!NT_STATUS_IS_OK(nt_status)) {
1423 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1424 talloc_free(tmp_ctx);
1425 return ISC_FALSE;
1426 }
1427
1428 /* Get the DN from name */
1429 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1430 if (result != ISC_R_SUCCESS) {
1431 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1432 talloc_free(tmp_ctx);
1433 return ISC_FALSE;
1434 }
1435
1436 /* make sure the dn exists, or find parent dn in case new object is being added */
1437 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1438 attrs, "objectClass=dnsNode");
1439 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1440 ldb_dn_remove_child_components(dn, 1);
1441 access_mask = SEC_ADS_CREATE_CHILD;
1442 talloc_free(res);
1443 } else if (ldb_ret == LDB_SUCCESS) {
1444 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1445 talloc_free(res);
1446 } else {
1447 talloc_free(tmp_ctx);
1448 return ISC_FALSE;
1449 }
1450
1451 /* Do ACL check */
1452 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1453 session_info->security_token,
1454 access_mask, NULL);
1455 if (ldb_ret != LDB_SUCCESS) {
1456 state->log(ISC_LOG_INFO,
1457 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1458 signer, name, type, ldb_strerror(ldb_ret));
1459 talloc_free(tmp_ctx);
1460 return ISC_FALSE;
1461 }
1462
1463 /* Cache session_info, so it can be used in the actual add/delete operation */
1464 state->update_name = talloc_strdup(state, name);
1465 if (state->update_name == NULL) {
1466 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1467 talloc_free(tmp_ctx);
1468 return ISC_FALSE;
1469 }
1470 state->session_info = talloc_steal(state, session_info);
1471
1472 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1473 signer, name, tcpaddr, type, key);
1474
1475 talloc_free(tmp_ctx);
1476 return ISC_TRUE;
1477 }
1478
1479 /*
1480 see if two DNS names are the same
1481 */
1482 static bool dns_name_equal(const char *name1, const char *name2)
1483 {
1484 size_t len1 = strlen(name1);
1485 size_t len2 = strlen(name2);
1486 if (name1[len1-1] == '.') len1--;
1487 if (name2[len2-1] == '.') len2--;
1488 if (len1 != len2) {
1489 return false;
1490 }
1491 return strncasecmp_m(name1, name2, len1) == 0;
1492 }
1493
1494
1495 /*
1496 see if two dns records match
1497 */
1498 static bool b9_record_match(struct dlz_bind9_data *state,
1499 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1500 {
1501 bool status;
1502 int i;
1503 struct in6_addr rec1_in_addr6;
1504 struct in6_addr rec2_in_addr6;
1505
1506 if (rec1->wType != rec2->wType) {
1507 return false;
1508 }
1509 /* see if this type is single valued */
1510 if (b9_single_valued(rec1->wType)) {
1511 return true;
1512 }
1513
1514 /* see if the data matches */
1515 switch (rec1->wType) {
1516 case DNS_TYPE_A:
1517 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1518 case DNS_TYPE_AAAA: {
1519 int ret;
1520
1521 ret = inet_pton(AF_INET6, rec1->data.ipv6, &rec1_in_addr6);
1522 if (ret != 1) {
1523 return false;
1524 }
1525 ret = inet_pton(AF_INET6, rec2->data.ipv6, &rec2_in_addr6);
1526 if (ret != 1) {
1527 return false;
1528 }
1529
1530 return memcmp(&rec1_in_addr6, &rec2_in_addr6, sizeof(rec1_in_addr6)) == 0;
1531 }
1532 case DNS_TYPE_CNAME:
1533 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1534 case DNS_TYPE_TXT:
1535 status = (rec1->data.txt.count == rec2->data.txt.count);
1536 if (!status) return status;
1537 for (i=0; i<rec1->data.txt.count; i++) {
1538 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1539 }
1540 return status;
1541 case DNS_TYPE_PTR:
1542 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1543 case DNS_TYPE_NS:
1544 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1545
1546 case DNS_TYPE_SRV:
1547 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1548 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1549 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1550 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1551
1552 case DNS_TYPE_MX:
1553 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1554 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1555
1556 case DNS_TYPE_HINFO:
1557 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1558 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1559
1560 case DNS_TYPE_SOA:
1561 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1562 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1563 rec1->data.soa.serial == rec2->data.soa.serial &&
1564 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1565 rec1->data.soa.retry == rec2->data.soa.retry &&
1566 rec1->data.soa.expire == rec2->data.soa.expire &&
1567 rec1->data.soa.minimum == rec2->data.soa.minimum;
1568 default:
1569 state->log(ISC_LOG_ERROR, "samba_dlz b9_record_match: unhandled record type %u",
1570 rec1->wType);
1571 break;
1572 }
1573
1574 return false;
1575 }
1576
1577 /*
1578 * Update session_info on samdb using the cached credentials
1579 */
1580 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1581 {
1582 int ret;
1583
1584 if (state->update_name == NULL || state->session_info == NULL) {
1585 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1586 return false;
1587 }
1588
1589 /* Do not use client credentials, if we're not updating the client specified name */
1590 if (strcmp(state->update_name, name) != 0) {
1591 return true;
1592 }
1593
1594 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1595 if (ret != LDB_SUCCESS) {
1596 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1597 return false;
1598 }
1599
1600 return true;
1601 }
1602
1603 /*
1604 * Reset session_info on samdb as system session
1605 */
1606 static void b9_reset_session_info(struct dlz_bind9_data *state)
1607 {
1608 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1609 }
1610
1611 /*
1612 add or modify a rdataset
1613 */
1614 _PUBLIC_ isc_result_t dlz_addrdataset(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 bool tombstoned = false;
1621 bool needs_add = false;
1622 struct dnsp_DnssrvRpcRecord *recs = NULL;
1623 uint16_t num_recs = 0;
1624 uint16_t first = 0;
1625 uint16_t i;
1626 NTTIME t;
1627 WERROR werr;
1628
1629 if (state->transaction_token != (void*)version) {
1630 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1631 return ISC_R_FAILURE;
1632 }
1633
1634 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1635 if (rec == NULL) {
1636 return ISC_R_NOMEMORY;
1637 }
1638
1639 unix_to_nt_time(&t, time(NULL));
1640 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1641 t /= 3600; /* convert to hours */
1642
1643 rec->rank = DNS_RANK_ZONE;
1644 rec->dwTimeStamp = (uint32_t)t;
1645
1646 if (!b9_parse(state, rdatastr, rec)) {
1647 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1648 talloc_free(rec);
1649 return ISC_R_FAILURE;
1650 }
1651
1652 /* find the DN of the record */
1653 result = b9_find_name_dn(state, name, rec, &dn);
1654 if (result != ISC_R_SUCCESS) {
1655 talloc_free(rec);
1656 return result;
1657 }
1658
1659 /* get any existing records */
1660 werr = dns_common_lookup(state->samdb, rec, dn,
1661 &recs, &num_recs, &tombstoned);
1662 if (W_ERROR_EQUAL(werr, WERR_DNS_ERROR_NAME_DOES_NOT_EXIST)) {
1663 needs_add = true;
1664 werr = WERR_OK;
1665 }
1666 if (!W_ERROR_IS_OK(werr)) {
1667 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
1668 ldb_dn_get_linearized(dn), win_errstr(werr));
1669 talloc_free(rec);
1670 return ISC_R_FAILURE;
1671 }
1672
1673 if (tombstoned) {
1674 /*
1675 * we need to keep the existing tombstone record
1676 * and ignore it
1677 */
1678 first = num_recs;
1679 }
1680
1681 /* there are existing records. We need to see if this will
1682 * replace a record or add to it
1683 */
1684 for (i=first; i < num_recs; i++) {
1685 if (b9_record_match(state, rec, &recs[i])) {
1686 break;
1687 }
1688 }
1689 if (i == UINT16_MAX) {
1690 state->log(ISC_LOG_ERROR, "samba_dlz: failed to already %u dnsRecord values for %s",
1691 i, ldb_dn_get_linearized(dn));
1692 talloc_free(rec);
1693 return ISC_R_FAILURE;
1694 }
1695
1696 if (i == num_recs) {
1697 /* adding a new value */
1698 recs = talloc_realloc(rec, recs,
1699 struct dnsp_DnssrvRpcRecord,
1700 num_recs + 1);
1701 if (recs == NULL) {
1702 talloc_free(rec);
1703 return ISC_R_NOMEMORY;
1704 }
1705 num_recs++;
1706 }
1707
1708 recs[i] = *rec;
1709
1710 if (!b9_set_session_info(state, name)) {
1711 talloc_free(rec);
1712 return ISC_R_FAILURE;
1713 }
1714
1715 /* modify the record */
1716 werr = dns_common_replace(state->samdb, rec, dn,
1717 needs_add,
1718 state->soa_serial,
1719 recs, num_recs);
1720 b9_reset_session_info(state);
1721 if (!W_ERROR_IS_OK(werr)) {
1722 state->log(ISC_LOG_ERROR, "samba_dlz: failed to %s %s - %s",
1723 needs_add ? "add" : "modify",
1724 ldb_dn_get_linearized(dn), win_errstr(werr));
1725 talloc_free(rec);
1726 return ISC_R_FAILURE;
1727 }
1728
1729 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1730
1731 talloc_free(rec);
1732 return ISC_R_SUCCESS;
1733 }
1734
1735 /*
1736 remove a rdataset
1737 */
1738 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1739 {
1740 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1741 struct dnsp_DnssrvRpcRecord *rec;
1742 struct ldb_dn *dn;
1743 isc_result_t result;
1744 struct dnsp_DnssrvRpcRecord *recs = NULL;
1745 uint16_t num_recs = 0;
1746 uint16_t i;
1747 WERROR werr;
1748
1749 if (state->transaction_token != (void*)version) {
1750 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1751 return ISC_R_FAILURE;
1752 }
1753
1754 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1755 if (rec == NULL) {
1756 return ISC_R_NOMEMORY;
1757 }
1758
1759 if (!b9_parse(state, rdatastr, rec)) {
1760 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1761 talloc_free(rec);
1762 return ISC_R_FAILURE;
1763 }
1764
1765 /* find the DN of the record */
1766 result = b9_find_name_dn(state, name, rec, &dn);
1767 if (result != ISC_R_SUCCESS) {
1768 talloc_free(rec);
1769 return result;
1770 }
1771
1772 /* get the existing records */
1773 werr = dns_common_lookup(state->samdb, rec, dn,
1774 &recs, &num_recs, NULL);
1775 if (!W_ERROR_IS_OK(werr)) {
1776 talloc_free(rec);
1777 return ISC_R_NOTFOUND;
1778 }
1779
1780 for (i=0; i < num_recs; i++) {
1781 if (b9_record_match(state, rec, &recs[i])) {
1782 recs[i] = (struct dnsp_DnssrvRpcRecord) {
1783 .wType = DNS_TYPE_TOMBSTONE,
1784 };
1785 break;
1786 }
1787 }
1788 if (i == num_recs) {
1789 talloc_free(rec);
1790 return ISC_R_NOTFOUND;
1791 }
1792
1793 if (!b9_set_session_info(state, name)) {
1794 talloc_free(rec);
1795 return ISC_R_FAILURE;
1796 }
1797
1798 /* modify the record */
1799 werr = dns_common_replace(state->samdb, rec, dn,
1800 false,/* needs_add */
1801 state->soa_serial,
1802 recs, num_recs);
1803 b9_reset_session_info(state);
1804 if (!W_ERROR_IS_OK(werr)) {
1805 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1806 ldb_dn_get_linearized(dn), win_errstr(werr));
1807 talloc_free(rec);
1808 return ISC_R_FAILURE;
1809 }
1810
1811 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1812
1813 talloc_free(rec);
1814 return ISC_R_SUCCESS;
1815 }
1816
1817
1818 /*
1819 delete all records of the given type
1820 */
1821 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1822 {
1823 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1824 TALLOC_CTX *tmp_ctx;
1825 struct ldb_dn *dn;
1826 isc_result_t result;
1827 enum dns_record_type dns_type;
1828 bool found = false;
1829 struct dnsp_DnssrvRpcRecord *recs = NULL;
1830 uint16_t num_recs = 0;
1831 uint16_t ri = 0;
1832 WERROR werr;
1833
1834 if (state->transaction_token != (void*)version) {
1835 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1836 return ISC_R_FAILURE;
1837 }
1838
1839 if (!b9_dns_type(type, &dns_type)) {
1840 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1841 return ISC_R_FAILURE;
1842 }
1843
1844 tmp_ctx = talloc_new(state);
1845
1846 /* find the DN of the record */
1847 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1848 if (result != ISC_R_SUCCESS) {
1849 talloc_free(tmp_ctx);
1850 return result;
1851 }
1852
1853 /* get the existing records */
1854 werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
1855 &recs, &num_recs, NULL);
1856 if (!W_ERROR_IS_OK(werr)) {
1857 talloc_free(tmp_ctx);
1858 return ISC_R_NOTFOUND;
1859 }
1860
1861 for (ri=0; ri < num_recs; ri++) {
1862 if (dns_type != recs[ri].wType) {
1863 continue;
1864 }
1865
1866 found = true;
1867 recs[ri] = (struct dnsp_DnssrvRpcRecord) {
1868 .wType = DNS_TYPE_TOMBSTONE,
1869 };
1870 }
1871
1872 if (!found) {
1873 talloc_free(tmp_ctx);
1874 return ISC_R_FAILURE;
1875 }
1876
1877 if (!b9_set_session_info(state, name)) {
1878 talloc_free(tmp_ctx);
1879 return ISC_R_FAILURE;
1880 }
1881
1882 /* modify the record */
1883 werr = dns_common_replace(state->samdb, tmp_ctx, dn,
1884 false,/* needs_add */
1885 state->soa_serial,
1886 recs, num_recs);
1887 b9_reset_session_info(state);
1888 if (!W_ERROR_IS_OK(werr)) {
1889 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1890 ldb_dn_get_linearized(dn), win_errstr(werr));
1891 talloc_free(tmp_ctx);
1892 return ISC_R_FAILURE;
1893 }
1894
1895 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1896
1897 talloc_free(tmp_ctx);
1898 return ISC_R_SUCCESS;
1899 }
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