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s4-samba-tool: add password verification in change user pass
[Samba/gebeck_regimport.git] / source4 / dns_server / dlz_bind9.c
blob6aa0aad8de187cac111c8b1524ec09152c491c20
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 void (*log)(int level, const char *fmt, ...);
63 isc_result_t (*putrr)(dns_sdlzlookup_t *handle, const char *type,
64 dns_ttl_t ttl, const char *data);
65 isc_result_t (*putnamedrr)(dns_sdlzlookup_t *handle, const char *name,
66 const char *type, dns_ttl_t ttl, const char *data);
67 isc_result_t (*writeable_zone)(dns_view_t *view, const char *zone_name);
68 };
69
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 state = talloc_zero(NULL, struct dlz_bind9_data);
576 if (state == NULL) {
577 return ISC_R_NOMEMORY;
578 }
579
580 talloc_set_destructor(state, dlz_state_debug_unregister);
581
582 /* fill in the helper functions */
583 va_start(ap, dbdata);
584 while ((helper_name = va_arg(ap, const char *)) != NULL) {
585 b9_add_helper(state, helper_name, va_arg(ap, void*));
586 }
587 va_end(ap);
588
589 /* Do not install samba signal handlers */
590 fault_setup_disable();
591
592 /* Start logging (to the bind9 logs) */
593 debug_set_callback(state, b9_debug);
594
595 state->ev_ctx = s4_event_context_init(state);
596 if (state->ev_ctx == NULL) {
597 result = ISC_R_NOMEMORY;
598 goto failed;
599 }
600
601 result = parse_options(state, argc, argv, &state->options);
602 if (result != ISC_R_SUCCESS) {
603 goto failed;
604 }
605
606 state->lp = loadparm_init_global(true);
607 if (state->lp == NULL) {
608 result = ISC_R_NOMEMORY;
609 goto failed;
610 }
611
612 if (state->options.debug) {
613 lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
614 } else {
615 lpcfg_do_global_parameter(state->lp, "log level", "0");
616 }
617
618 if (smb_krb5_init_context(state, state->ev_ctx, state->lp, &state->smb_krb5_ctx) != 0) {
619 result = ISC_R_NOMEMORY;
620 goto failed;
621 }
622
623 nt_status = gensec_init();
624 if (!NT_STATUS_IS_OK(nt_status)) {
625 result = ISC_R_NOMEMORY;
626 goto failed;
627 }
628
629 state->auth_context = talloc_zero(state, struct auth4_context);
630 if (state->auth_context == NULL) {
631 result = ISC_R_NOMEMORY;
632 goto failed;
633 }
634
635 if (state->options.url == NULL) {
636 state->options.url = lpcfg_private_path(state, state->lp, "dns/sam.ldb");
637 if (state->options.url == NULL) {
638 result = ISC_R_NOMEMORY;
639 goto failed;
640 }
641 }
642
643 state->samdb = samdb_connect_url(state, state->ev_ctx, state->lp,
644 system_session(state->lp), 0, state->options.url);
645 if (state->samdb == NULL) {
646 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to connect to %s",
647 state->options.url);
648 result = ISC_R_FAILURE;
649 goto failed;
650 }
651
652 dn = ldb_get_default_basedn(state->samdb);
653 if (dn == NULL) {
654 state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
655 state->options.url, ldb_errstring(state->samdb));
656 result = ISC_R_FAILURE;
657 goto failed;
658 }
659
660 state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
661 ldb_dn_get_linearized(dn));
662
663 state->auth_context->event_ctx = state->ev_ctx;
664 state->auth_context->lp_ctx = state->lp;
665 state->auth_context->sam_ctx = state->samdb;
666 state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
667
668 *dbdata = state;
669
670 return ISC_R_SUCCESS;
671
672 failed:
673 talloc_free(state);
674 return result;
675 }
676
677 /*
678 shutdown the backend
679 */
680 _PUBLIC_ void dlz_destroy(void *dbdata)
681 {
682 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
683 state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
684 talloc_free(state);
685 }
686
687
688 /*
689 return the base DN for a zone
690 */
691 static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
692 TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
693 {
694 int ret;
695 TALLOC_CTX *tmp_ctx = talloc_new(state);
696 const char *attrs[] = { NULL };
697 int i;
698
699 for (i=0; zone_prefixes[i]; i++) {
700 struct ldb_dn *dn;
701 struct ldb_result *res;
702
703 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
704 if (dn == NULL) {
705 talloc_free(tmp_ctx);
706 return ISC_R_NOMEMORY;
707 }
708
709 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone_name, zone_prefixes[i])) {
710 talloc_free(tmp_ctx);
711 return ISC_R_NOMEMORY;
712 }
713
714 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
715 if (ret == LDB_SUCCESS) {
716 if (zone_dn != NULL) {
717 *zone_dn = talloc_steal(mem_ctx, dn);
718 }
719 talloc_free(tmp_ctx);
720 return ISC_R_SUCCESS;
721 }
722 talloc_free(dn);
723 }
724
725 talloc_free(tmp_ctx);
726 return ISC_R_NOTFOUND;
727 }
728
729
730 /*
731 return the DN for a name. The record does not need to exist, but the
732 zone must exist
733 */
734 static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
735 TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
736 {
737 const char *p;
738
739 /* work through the name piece by piece, until we find a zone */
740 for (p=name; p; ) {
741 isc_result_t result;
742 result = b9_find_zone_dn(state, p, mem_ctx, dn);
743 if (result == ISC_R_SUCCESS) {
744 /* we found a zone, now extend the DN to get
745 * the full DN
746 */
747 bool ret;
748 if (p == name) {
749 ret = ldb_dn_add_child_fmt(*dn, "DC=@");
750 } else {
751 ret = ldb_dn_add_child_fmt(*dn, "DC=%.*s", (int)(p-name)-1, name);
752 }
753 if (!ret) {
754 talloc_free(*dn);
755 return ISC_R_NOMEMORY;
756 }
757 return ISC_R_SUCCESS;
758 }
759 p = strchr(p, '.');
760 if (p == NULL) {
761 break;
762 }
763 p++;
764 }
765 return ISC_R_NOTFOUND;
766 }
767
768
769 /*
770 see if we handle a given zone
771 */
772 _PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name)
773 {
774 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
775 return b9_find_zone_dn(state, name, NULL, NULL);
776 }
777
778
779 /*
780 lookup one record
781 */
782 static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
783 const char *zone, const char *name,
784 dns_sdlzlookup_t *lookup,
785 const char **types)
786 {
787 TALLOC_CTX *tmp_ctx = talloc_new(state);
788 const char *attrs[] = { "dnsRecord", NULL };
789 int ret = LDB_SUCCESS, i;
790 struct ldb_result *res;
791 struct ldb_message_element *el;
792 struct ldb_dn *dn;
793
794 for (i=0; zone_prefixes[i]; i++) {
795 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
796 if (dn == NULL) {
797 talloc_free(tmp_ctx);
798 return ISC_R_NOMEMORY;
799 }
800
801 if (!ldb_dn_add_child_fmt(dn, "DC=%s,DC=%s,%s", name, zone, zone_prefixes[i])) {
802 talloc_free(tmp_ctx);
803 return ISC_R_NOMEMORY;
804 }
805
806 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
807 attrs, "objectClass=dnsNode");
808 if (ret == LDB_SUCCESS) {
809 break;
810 }
811 }
812 if (ret != LDB_SUCCESS) {
813 talloc_free(tmp_ctx);
814 return ISC_R_NOTFOUND;
815 }
816
817 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
818 if (el == NULL || el->num_values == 0) {
819 talloc_free(tmp_ctx);
820 return ISC_R_NOTFOUND;
821 }
822
823 for (i=0; i<el->num_values; i++) {
824 struct dnsp_DnssrvRpcRecord rec;
825 enum ndr_err_code ndr_err;
826 isc_result_t result;
827
828 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
829 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
830 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
831 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
832 ldb_dn_get_linearized(dn));
833 talloc_free(tmp_ctx);
834 return ISC_R_FAILURE;
835 }
836
837 result = b9_putrr(state, lookup, &rec, types);
838 if (result != ISC_R_SUCCESS) {
839 talloc_free(tmp_ctx);
840 return result;
841 }
842 }
843
844 talloc_free(tmp_ctx);
845 return ISC_R_SUCCESS;
846 }
847
848 /*
849 lookup one record
850 */
851 _PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
852 void *dbdata, dns_sdlzlookup_t *lookup)
853 {
854 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
855 return dlz_lookup_types(state, zone, name, lookup, NULL);
856 }
857
858
859 /*
860 see if a zone transfer is allowed
861 */
862 _PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
863 {
864 /* just say yes for all our zones for now */
865 return dlz_findzonedb(dbdata, name);
866 }
867
868 /*
869 perform a zone transfer
870 */
871 _PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
872 dns_sdlzallnodes_t *allnodes)
873 {
874 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
875 const char *attrs[] = { "dnsRecord", NULL };
876 int ret = LDB_SUCCESS, i, j;
877 struct ldb_dn *dn;
878 struct ldb_result *res;
879 TALLOC_CTX *tmp_ctx = talloc_new(state);
880
881 for (i=0; zone_prefixes[i]; i++) {
882 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
883 if (dn == NULL) {
884 talloc_free(tmp_ctx);
885 return ISC_R_NOMEMORY;
886 }
887
888 if (!ldb_dn_add_child_fmt(dn, "DC=%s,%s", zone, zone_prefixes[i])) {
889 talloc_free(tmp_ctx);
890 return ISC_R_NOMEMORY;
891 }
892
893 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
894 attrs, "objectClass=dnsNode");
895 if (ret == LDB_SUCCESS) {
896 break;
897 }
898 }
899 if (ret != LDB_SUCCESS) {
900 talloc_free(tmp_ctx);
901 return ISC_R_NOTFOUND;
902 }
903
904 for (i=0; i<res->count; i++) {
905 struct ldb_message_element *el;
906 TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
907 const char *rdn, *name;
908 const struct ldb_val *v;
909
910 el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
911 if (el == NULL || el->num_values == 0) {
912 state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
913 ldb_dn_get_linearized(dn));
914 talloc_free(el_ctx);
915 continue;
916 }
917
918 v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
919 if (v == NULL) {
920 state->log(ISC_LOG_INFO, "failed to find RDN for %s",
921 ldb_dn_get_linearized(dn));
922 talloc_free(el_ctx);
923 continue;
924 }
925
926 rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
927 if (rdn == NULL) {
928 talloc_free(tmp_ctx);
929 return ISC_R_NOMEMORY;
930 }
931
932 if (strcmp(rdn, "@") == 0) {
933 name = zone;
934 } else {
935 name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
936 }
937 if (name == NULL) {
938 talloc_free(tmp_ctx);
939 return ISC_R_NOMEMORY;
940 }
941
942 for (j=0; j<el->num_values; j++) {
943 struct dnsp_DnssrvRpcRecord rec;
944 enum ndr_err_code ndr_err;
945 isc_result_t result;
946
947 ndr_err = ndr_pull_struct_blob(&el->values[j], el_ctx, &rec,
948 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
949 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
950 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
951 ldb_dn_get_linearized(dn));
952 continue;
953 }
954
955 result = b9_putnamedrr(state, allnodes, name, &rec);
956 if (result != ISC_R_SUCCESS) {
957 continue;
958 }
959 }
960 }
961
962 talloc_free(tmp_ctx);
963
964 return ISC_R_SUCCESS;
965 }
966
967
968 /*
969 start a transaction
970 */
971 _PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
972 {
973 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
974
975 state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
976
977 if (state->transaction_token != NULL) {
978 state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
979 return ISC_R_FAILURE;
980 }
981
982 state->transaction_token = talloc_zero(state, int);
983 if (state->transaction_token == NULL) {
984 return ISC_R_NOMEMORY;
985 }
986
987 if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
988 state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
989 talloc_free(state->transaction_token);
990 state->transaction_token = NULL;
991 return ISC_R_FAILURE;
992 }
993
994 *versionp = (void *)state->transaction_token;
995
996 return ISC_R_SUCCESS;
997 }
998
999 /*
1000 end a transaction
1001 */
1002 _PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
1003 void *dbdata, void **versionp)
1004 {
1005 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1006
1007 if (state->transaction_token != (int *)*versionp) {
1008 state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
1009 return;
1010 }
1011
1012 if (commit) {
1013 if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
1014 state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
1015 return;
1016 }
1017 state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
1018 } else {
1019 if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
1020 state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
1021 return;
1022 }
1023 state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
1024 }
1025
1026 talloc_free(state->transaction_token);
1027 state->transaction_token = NULL;
1028 *versionp = NULL;
1029 }
1030
1031
1032 /*
1033 see if there is a SOA record for a zone
1034 */
1035 static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
1036 {
1037 const char *attrs[] = { "dnsRecord", NULL };
1038 struct ldb_result *res;
1039 struct ldb_message_element *el;
1040 TALLOC_CTX *tmp_ctx = talloc_new(state);
1041 int ret, i;
1042
1043 if (!ldb_dn_add_child_fmt(dn, "DC=@,DC=%s", zone)) {
1044 talloc_free(tmp_ctx);
1045 return false;
1046 }
1047
1048 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1049 attrs, "objectClass=dnsNode");
1050 if (ret != LDB_SUCCESS) {
1051 talloc_free(tmp_ctx);
1052 return false;
1053 }
1054
1055 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1056 if (el == NULL) {
1057 talloc_free(tmp_ctx);
1058 return false;
1059 }
1060 for (i=0; i<el->num_values; i++) {
1061 struct dnsp_DnssrvRpcRecord rec;
1062 enum ndr_err_code ndr_err;
1063
1064 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec,
1065 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1066 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1067 continue;
1068 }
1069 if (rec.wType == DNS_TYPE_SOA) {
1070 talloc_free(tmp_ctx);
1071 return true;
1072 }
1073 }
1074
1075 talloc_free(tmp_ctx);
1076 return false;
1077 }
1078
1079 /*
1080 configure a writeable zone
1081 */
1082 _PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, void *dbdata)
1083 {
1084 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1085 TALLOC_CTX *tmp_ctx;
1086 struct ldb_dn *dn;
1087 int i;
1088
1089 state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
1090 if (state->writeable_zone == NULL) {
1091 state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
1092 return ISC_R_FAILURE;
1093 }
1094
1095 tmp_ctx = talloc_new(state);
1096
1097 for (i=0; zone_prefixes[i]; i++) {
1098 const char *attrs[] = { "name", NULL };
1099 int j, ret;
1100 struct ldb_result *res;
1101
1102 dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
1103 if (dn == NULL) {
1104 talloc_free(tmp_ctx);
1105 return ISC_R_NOMEMORY;
1106 }
1107
1108 if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
1109 talloc_free(tmp_ctx);
1110 return ISC_R_NOMEMORY;
1111 }
1112
1113 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
1114 attrs, "objectClass=dnsZone");
1115 if (ret != LDB_SUCCESS) {
1116 continue;
1117 }
1118
1119 for (j=0; j<res->count; j++) {
1120 isc_result_t result;
1121 const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
1122 struct ldb_dn *zone_dn;
1123
1124 if (zone == NULL) {
1125 continue;
1126 }
1127 zone_dn = ldb_dn_copy(tmp_ctx, dn);
1128 if (zone_dn == NULL) {
1129 talloc_free(tmp_ctx);
1130 return ISC_R_NOMEMORY;
1131 }
1132
1133 if (!b9_has_soa(state, zone_dn, zone)) {
1134 continue;
1135 }
1136 result = state->writeable_zone(view, zone);
1137 if (result != ISC_R_SUCCESS) {
1138 state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
1139 zone);
1140 talloc_free(tmp_ctx);
1141 return result;
1142 }
1143 state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
1144 }
1145 }
1146
1147 talloc_free(tmp_ctx);
1148 return ISC_R_SUCCESS;
1149 }
1150
1151 /*
1152 authorize a zone update
1153 */
1154 _PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
1155 const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
1156 void *dbdata)
1157 {
1158 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1159 TALLOC_CTX *tmp_ctx;
1160 DATA_BLOB ap_req;
1161 struct cli_credentials *server_credentials;
1162 char *keytab_name;
1163 int ret;
1164 int ldb_ret;
1165 NTSTATUS nt_status;
1166 struct gensec_security *gensec_ctx;
1167 struct auth_session_info *session_info;
1168 struct ldb_dn *dn;
1169 isc_result_t result;
1170 struct ldb_result *res;
1171 const char * attrs[] = { NULL };
1172 uint32_t access_mask;
1173
1174 /* Remove cached credentials, if any */
1175 if (state->session_info) {
1176 talloc_free(state->session_info);
1177 state->session_info = NULL;
1178 }
1179 if (state->update_name) {
1180 talloc_free(state->update_name);
1181 state->update_name = NULL;
1182 }
1183
1184 tmp_ctx = talloc_new(NULL);
1185 if (tmp_ctx == NULL) {
1186 state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
1187 return false;
1188 }
1189
1190 ap_req = data_blob_const(keydata, keydatalen);
1191 server_credentials = cli_credentials_init(tmp_ctx);
1192 if (!server_credentials) {
1193 state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
1194 talloc_free(tmp_ctx);
1195 return false;
1196 }
1197
1198 cli_credentials_set_krb5_context(server_credentials, state->smb_krb5_ctx);
1199 cli_credentials_set_conf(server_credentials, state->lp);
1200
1201 keytab_name = talloc_asprintf(tmp_ctx, "file:%s/dns.keytab",
1202 lpcfg_private_dir(state->lp));
1203 ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
1204 CRED_SPECIFIED);
1205 if (ret != 0) {
1206 state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
1207 keytab_name);
1208 talloc_free(tmp_ctx);
1209 return false;
1210 }
1211 talloc_free(keytab_name);
1212
1213 nt_status = gensec_server_start(tmp_ctx,
1214 lpcfg_gensec_settings(tmp_ctx, state->lp),
1215 state->auth_context, &gensec_ctx);
1216 if (!NT_STATUS_IS_OK(nt_status)) {
1217 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
1218 talloc_free(tmp_ctx);
1219 return false;
1220 }
1221
1222 gensec_set_credentials(gensec_ctx, server_credentials);
1223
1224 nt_status = gensec_start_mech_by_name(gensec_ctx, "spnego");
1225 if (!NT_STATUS_IS_OK(nt_status)) {
1226 state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
1227 talloc_free(tmp_ctx);
1228 return false;
1229 }
1230
1231 nt_status = gensec_update(gensec_ctx, tmp_ctx, state->ev_ctx, ap_req, &ap_req);
1232 if (!NT_STATUS_IS_OK(nt_status)) {
1233 state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
1234 talloc_free(tmp_ctx);
1235 return false;
1236 }
1237
1238 nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
1239 if (!NT_STATUS_IS_OK(nt_status)) {
1240 state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
1241 talloc_free(tmp_ctx);
1242 return false;
1243 }
1244
1245 /* Get the DN from name */
1246 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1247 if (result != ISC_R_SUCCESS) {
1248 state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
1249 talloc_free(tmp_ctx);
1250 return false;
1251 }
1252
1253 /* make sure the dn exists, or find parent dn in case new object is being added */
1254 ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
1255 attrs, "objectClass=dnsNode");
1256 if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
1257 ldb_dn_remove_child_components(dn, 1);
1258 access_mask = SEC_ADS_CREATE_CHILD;
1259 talloc_free(res);
1260 } else if (ldb_ret == LDB_SUCCESS) {
1261 access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
1262 talloc_free(res);
1263 } else {
1264 talloc_free(tmp_ctx);
1265 return false;
1266 }
1267
1268 /* Do ACL check */
1269 ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
1270 session_info->security_token,
1271 access_mask, NULL);
1272 if (ldb_ret != LDB_SUCCESS) {
1273 state->log(ISC_LOG_INFO,
1274 "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
1275 signer, name, type, ldb_strerror(ldb_ret));
1276 talloc_free(tmp_ctx);
1277 return false;
1278 }
1279
1280 /* Cache session_info, so it can be used in the actual add/delete operation */
1281 state->update_name = talloc_strdup(state, name);
1282 if (state->update_name == NULL) {
1283 state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
1284 talloc_free(tmp_ctx);
1285 return false;
1286 }
1287 state->session_info = talloc_steal(state, session_info);
1288
1289 state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
1290 signer, name, tcpaddr, type, key);
1291
1292 talloc_free(tmp_ctx);
1293 return true;
1294 }
1295
1296
1297 /*
1298 add a new record
1299 */
1300 static isc_result_t b9_add_record(struct dlz_bind9_data *state, const char *name,
1301 struct ldb_dn *dn,
1302 struct dnsp_DnssrvRpcRecord *rec)
1303 {
1304 struct ldb_message *msg;
1305 enum ndr_err_code ndr_err;
1306 struct ldb_val v;
1307 int ret;
1308
1309 msg = ldb_msg_new(rec);
1310 if (msg == NULL) {
1311 return ISC_R_NOMEMORY;
1312 }
1313 msg->dn = dn;
1314 ret = ldb_msg_add_string(msg, "objectClass", "dnsNode");
1315 if (ret != LDB_SUCCESS) {
1316 return ISC_R_FAILURE;
1317 }
1318
1319 ndr_err = ndr_push_struct_blob(&v, rec, rec, (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1320 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1321 return ISC_R_FAILURE;
1322 }
1323 ret = ldb_msg_add_value(msg, "dnsRecord", &v, NULL);
1324 if (ret != LDB_SUCCESS) {
1325 return ISC_R_FAILURE;
1326 }
1327
1328 ret = ldb_add(state->samdb, msg);
1329 if (ret != LDB_SUCCESS) {
1330 return ISC_R_FAILURE;
1331 }
1332
1333 return ISC_R_SUCCESS;
1334 }
1335
1336 /*
1337 see if two DNS names are the same
1338 */
1339 static bool dns_name_equal(const char *name1, const char *name2)
1340 {
1341 size_t len1 = strlen(name1);
1342 size_t len2 = strlen(name2);
1343 if (name1[len1-1] == '.') len1--;
1344 if (name2[len2-1] == '.') len2--;
1345 if (len1 != len2) {
1346 return false;
1347 }
1348 return strncasecmp_m(name1, name2, len1) == 0;
1349 }
1350
1351
1352 /*
1353 see if two dns records match
1354 */
1355 static bool b9_record_match(struct dlz_bind9_data *state,
1356 struct dnsp_DnssrvRpcRecord *rec1, struct dnsp_DnssrvRpcRecord *rec2)
1357 {
1358 bool status;
1359 int i;
1360
1361 if (rec1->wType != rec2->wType) {
1362 return false;
1363 }
1364 /* see if this type is single valued */
1365 if (b9_single_valued(rec1->wType)) {
1366 return true;
1367 }
1368
1369 /* see if the data matches */
1370 switch (rec1->wType) {
1371 case DNS_TYPE_A:
1372 return strcmp(rec1->data.ipv4, rec2->data.ipv4) == 0;
1373 case DNS_TYPE_AAAA:
1374 return strcmp(rec1->data.ipv6, rec2->data.ipv6) == 0;
1375 case DNS_TYPE_CNAME:
1376 return dns_name_equal(rec1->data.cname, rec2->data.cname);
1377 case DNS_TYPE_TXT:
1378 status = (rec1->data.txt.count == rec2->data.txt.count);
1379 if (!status) return status;
1380 for (i=0; i<rec1->data.txt.count; i++) {
1381 status &= (strcmp(rec1->data.txt.str[i], rec2->data.txt.str[i]) == 0);
1382 }
1383 return status;
1384 case DNS_TYPE_PTR:
1385 return dns_name_equal(rec1->data.ptr, rec2->data.ptr);
1386 case DNS_TYPE_NS:
1387 return dns_name_equal(rec1->data.ns, rec2->data.ns);
1388
1389 case DNS_TYPE_SRV:
1390 return rec1->data.srv.wPriority == rec2->data.srv.wPriority &&
1391 rec1->data.srv.wWeight == rec2->data.srv.wWeight &&
1392 rec1->data.srv.wPort == rec2->data.srv.wPort &&
1393 dns_name_equal(rec1->data.srv.nameTarget, rec2->data.srv.nameTarget);
1394
1395 case DNS_TYPE_MX:
1396 return rec1->data.mx.wPriority == rec2->data.mx.wPriority &&
1397 dns_name_equal(rec1->data.mx.nameTarget, rec2->data.mx.nameTarget);
1398
1399 case DNS_TYPE_HINFO:
1400 return strcmp(rec1->data.hinfo.cpu, rec2->data.hinfo.cpu) == 0 &&
1401 strcmp(rec1->data.hinfo.os, rec2->data.hinfo.os) == 0;
1402
1403 case DNS_TYPE_SOA:
1404 return dns_name_equal(rec1->data.soa.mname, rec2->data.soa.mname) &&
1405 dns_name_equal(rec1->data.soa.rname, rec2->data.soa.rname) &&
1406 rec1->data.soa.serial == rec2->data.soa.serial &&
1407 rec1->data.soa.refresh == rec2->data.soa.refresh &&
1408 rec1->data.soa.retry == rec2->data.soa.retry &&
1409 rec1->data.soa.expire == rec2->data.soa.expire &&
1410 rec1->data.soa.minimum == rec2->data.soa.minimum;
1411 default:
1412 state->log(ISC_LOG_ERROR, "samba b9_putrr: unhandled record type %u",
1413 rec1->wType);
1414 break;
1415 }
1416
1417 return false;
1418 }
1419
1420 /*
1421 * Update session_info on samdb using the cached credentials
1422 */
1423 static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
1424 {
1425 int ret;
1426
1427 if (state->update_name == NULL || state->session_info == NULL) {
1428 state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
1429 return false;
1430 }
1431
1432 /* Do not use client credentials, if we not updating the client specified name */
1433 if (strcmp(state->update_name, name) != 0) {
1434 return true;
1435 }
1436
1437 ret = ldb_set_opaque(state->samdb, "sessionInfo", state->session_info);
1438 if (ret != LDB_SUCCESS) {
1439 state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
1440 return false;
1441 }
1442
1443 return true;
1444 }
1445
1446 /*
1447 * Reset session_info on samdb as system session
1448 */
1449 static void b9_reset_session_info(struct dlz_bind9_data *state)
1450 {
1451 ldb_set_opaque(state->samdb, "sessionInfo", system_session(state->lp));
1452 }
1453
1454 /*
1455 add or modify a rdataset
1456 */
1457 _PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1458 {
1459 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1460 struct dnsp_DnssrvRpcRecord *rec;
1461 struct ldb_dn *dn;
1462 isc_result_t result;
1463 struct ldb_result *res;
1464 const char *attrs[] = { "dnsRecord", NULL };
1465 int ret, i;
1466 struct ldb_message_element *el;
1467 enum ndr_err_code ndr_err;
1468 NTTIME t;
1469
1470 if (state->transaction_token != (void*)version) {
1471 state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
1472 return ISC_R_FAILURE;
1473 }
1474
1475 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1476 if (rec == NULL) {
1477 return ISC_R_NOMEMORY;
1478 }
1479
1480 unix_to_nt_time(&t, time(NULL));
1481 t /= 10*1000*1000; /* convert to seconds (NT time is in 100ns units) */
1482 t /= 3600; /* convert to hours */
1483
1484 rec->rank = DNS_RANK_ZONE;
1485 rec->dwSerial = state->soa_serial;
1486 rec->dwTimeStamp = (uint32_t)t;
1487
1488 if (!b9_parse(state, rdatastr, rec)) {
1489 state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1490 talloc_free(rec);
1491 return ISC_R_FAILURE;
1492 }
1493
1494 /* find the DN of the record */
1495 result = b9_find_name_dn(state, name, rec, &dn);
1496 if (result != ISC_R_SUCCESS) {
1497 talloc_free(rec);
1498 return result;
1499 }
1500
1501 /* get any existing records */
1502 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1503 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1504 if (!b9_set_session_info(state, name)) {
1505 talloc_free(rec);
1506 return ISC_R_FAILURE;
1507 }
1508 result = b9_add_record(state, name, dn, rec);
1509 b9_reset_session_info(state);
1510 talloc_free(rec);
1511 if (result == ISC_R_SUCCESS) {
1512 state->log(ISC_LOG_INFO, "samba_dlz: added %s %s", name, rdatastr);
1513 }
1514 return result;
1515 }
1516
1517 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1518 if (el == NULL) {
1519 ret = ldb_msg_add_empty(res->msgs[0], "dnsRecord", LDB_FLAG_MOD_ADD, &el);
1520 if (ret != LDB_SUCCESS) {
1521 state->log(ISC_LOG_ERROR, "samba_dlz: failed to add dnsRecord for %s",
1522 ldb_dn_get_linearized(dn));
1523 talloc_free(rec);
1524 return ISC_R_FAILURE;
1525 }
1526 }
1527
1528 /* there are existing records. We need to see if this will
1529 * replace a record or add to it
1530 */
1531 for (i=0; i<el->num_values; i++) {
1532 struct dnsp_DnssrvRpcRecord rec2;
1533
1534 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1535 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1536 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1537 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1538 ldb_dn_get_linearized(dn));
1539 talloc_free(rec);
1540 return ISC_R_FAILURE;
1541 }
1542
1543 if (b9_record_match(state, rec, &rec2)) {
1544 break;
1545 }
1546 }
1547 if (i == el->num_values) {
1548 /* adding a new value */
1549 el->values = talloc_realloc(el, el->values, struct ldb_val, el->num_values+1);
1550 if (el->values == NULL) {
1551 talloc_free(rec);
1552 return ISC_R_NOMEMORY;
1553 }
1554 el->num_values++;
1555 }
1556
1557 ndr_err = ndr_push_struct_blob(&el->values[i], rec, rec,
1558 (ndr_push_flags_fn_t)ndr_push_dnsp_DnssrvRpcRecord);
1559 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1560 state->log(ISC_LOG_ERROR, "samba_dlz: failed to push dnsRecord for %s",
1561 ldb_dn_get_linearized(dn));
1562 talloc_free(rec);
1563 return ISC_R_FAILURE;
1564 }
1565
1566
1567 if (!b9_set_session_info(state, name)) {
1568 talloc_free(rec);
1569 return ISC_R_FAILURE;
1570 }
1571
1572 /* modify the record */
1573 el->flags = LDB_FLAG_MOD_REPLACE;
1574 ret = ldb_modify(state->samdb, res->msgs[0]);
1575 b9_reset_session_info(state);
1576 if (ret != LDB_SUCCESS) {
1577 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1578 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1579 talloc_free(rec);
1580 return ISC_R_FAILURE;
1581 }
1582
1583 state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
1584
1585 talloc_free(rec);
1586 return ISC_R_SUCCESS;
1587 }
1588
1589 /*
1590 remove a rdataset
1591 */
1592 _PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
1593 {
1594 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1595 struct dnsp_DnssrvRpcRecord *rec;
1596 struct ldb_dn *dn;
1597 isc_result_t result;
1598 struct ldb_result *res;
1599 const char *attrs[] = { "dnsRecord", NULL };
1600 int ret, i;
1601 struct ldb_message_element *el;
1602 enum ndr_err_code ndr_err;
1603
1604 if (state->transaction_token != (void*)version) {
1605 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1606 return ISC_R_FAILURE;
1607 }
1608
1609 rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
1610 if (rec == NULL) {
1611 return ISC_R_NOMEMORY;
1612 }
1613
1614 if (!b9_parse(state, rdatastr, rec)) {
1615 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
1616 talloc_free(rec);
1617 return ISC_R_FAILURE;
1618 }
1619
1620 /* find the DN of the record */
1621 result = b9_find_name_dn(state, name, rec, &dn);
1622 if (result != ISC_R_SUCCESS) {
1623 talloc_free(rec);
1624 return result;
1625 }
1626
1627 /* get the existing records */
1628 ret = ldb_search(state->samdb, rec, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1629 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1630 talloc_free(rec);
1631 return ISC_R_NOTFOUND;
1632 }
1633
1634 /* there are existing records. We need to see if any match
1635 */
1636 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1637 if (el == NULL || el->num_values == 0) {
1638 state->log(ISC_LOG_ERROR, "samba_dlz: no dnsRecord attribute for %s",
1639 ldb_dn_get_linearized(dn));
1640 talloc_free(rec);
1641 return ISC_R_FAILURE;
1642 }
1643
1644 for (i=0; i<el->num_values; i++) {
1645 struct dnsp_DnssrvRpcRecord rec2;
1646
1647 ndr_err = ndr_pull_struct_blob(&el->values[i], rec, &rec2,
1648 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1649 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1650 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1651 ldb_dn_get_linearized(dn));
1652 talloc_free(rec);
1653 return ISC_R_FAILURE;
1654 }
1655
1656 if (b9_record_match(state, rec, &rec2)) {
1657 break;
1658 }
1659 }
1660 if (i == el->num_values) {
1661 talloc_free(rec);
1662 return ISC_R_NOTFOUND;
1663 }
1664
1665 if (i < el->num_values-1) {
1666 memmove(&el->values[i], &el->values[i+1], sizeof(el->values[0])*((el->num_values-1)-i));
1667 }
1668 el->num_values--;
1669
1670 if (!b9_set_session_info(state, name)) {
1671 talloc_free(rec);
1672 return ISC_R_FAILURE;
1673 }
1674
1675 if (el->num_values == 0) {
1676 el->flags = LDB_FLAG_MOD_DELETE;
1677 } else {
1678 el->flags = LDB_FLAG_MOD_REPLACE;
1679 }
1680 ret = ldb_modify(state->samdb, res->msgs[0]);
1681
1682 b9_reset_session_info(state);
1683 if (ret != LDB_SUCCESS) {
1684 state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
1685 ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1686 talloc_free(rec);
1687 return ISC_R_FAILURE;
1688 }
1689
1690 state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
1691
1692 talloc_free(rec);
1693 return ISC_R_SUCCESS;
1694 }
1695
1696
1697 /*
1698 delete all records of the given type
1699 */
1700 _PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
1701 {
1702 struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
1703 TALLOC_CTX *tmp_ctx;
1704 struct ldb_dn *dn;
1705 isc_result_t result;
1706 struct ldb_result *res;
1707 const char *attrs[] = { "dnsRecord", NULL };
1708 int ret, i;
1709 struct ldb_message_element *el;
1710 enum ndr_err_code ndr_err;
1711 enum dns_record_type dns_type;
1712 bool found = false;
1713
1714 if (state->transaction_token != (void*)version) {
1715 state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
1716 return ISC_R_FAILURE;
1717 }
1718
1719 if (!b9_dns_type(type, &dns_type)) {
1720 state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
1721 return ISC_R_FAILURE;
1722 }
1723
1724 tmp_ctx = talloc_new(state);
1725
1726 /* find the DN of the record */
1727 result = b9_find_name_dn(state, name, tmp_ctx, &dn);
1728 if (result != ISC_R_SUCCESS) {
1729 talloc_free(tmp_ctx);
1730 return result;
1731 }
1732
1733 /* get the existing records */
1734 ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsNode");
1735 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
1736 talloc_free(tmp_ctx);
1737 return ISC_R_NOTFOUND;
1738 }
1739
1740 /* there are existing records. We need to see if any match the type
1741 */
1742 el = ldb_msg_find_element(res->msgs[0], "dnsRecord");
1743 if (el == NULL || el->num_values == 0) {
1744 talloc_free(tmp_ctx);
1745 return ISC_R_NOTFOUND;
1746 }
1747
1748 for (i=0; i<el->num_values; i++) {
1749 struct dnsp_DnssrvRpcRecord rec2;
1750
1751 ndr_err = ndr_pull_struct_blob(&el->values[i], tmp_ctx, &rec2,
1752 (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
1753 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1754 state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s",
1755 ldb_dn_get_linearized(dn));
1756 talloc_free(tmp_ctx);
1757 return ISC_R_FAILURE;
1758 }
1759
1760 if (dns_type == rec2.wType) {
1761 if (i < el->num_values-1) {
1762 memmove(&el->values[i], &el->values[i+1],
1763 sizeof(el->values[0])*((el->num_values-1)-i));
1764 }
1765 el->num_values--;
1766 i--;
1767 found = true;
1768 }
1769 }
1770
1771 if (!found) {
1772 talloc_free(tmp_ctx);
1773 return ISC_R_FAILURE;
1774 }
1775
1776 if (!b9_set_session_info(state, name)) {
1777 talloc_free(tmp_ctx);
1778 return ISC_R_FAILURE;
1779 }
1780
1781 if (el->num_values == 0) {
1782 el->flags = LDB_FLAG_MOD_DELETE;
1783 } else {
1784 el->flags = LDB_FLAG_MOD_REPLACE;
1785 }
1786 ret = ldb_modify(state->samdb, res->msgs[0]);
1787
1788 b9_reset_session_info(state);
1789 if (ret != LDB_SUCCESS) {
1790 state->log(ISC_LOG_ERROR, "samba_dlz: failed to delete type %s in %s - %s",
1791 type, ldb_dn_get_linearized(dn), ldb_errstring(state->samdb));
1792 talloc_free(tmp_ctx);
1793 return ISC_R_FAILURE;
1794 }
1795
1796 state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
1797
1798 talloc_free(tmp_ctx);
1799 return ISC_R_SUCCESS;
1800 }
reg import