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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
commit8daa83a594a2e98f39d764422bfbdbc62c9efd44 (patch)
tree4099e8021376c7d8c05bdf8503093d80e9c7bad0 /source4/dns_server/dlz_bind9.c
parentInitial commit. (diff)
downloadsamba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.tar.xz
samba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.zip
Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'source4/dns_server/dlz_bind9.c')
-rw-r--r--source4/dns_server/dlz_bind9.c2219
1 files changed, 2219 insertions, 0 deletions
diff --git a/source4/dns_server/dlz_bind9.c b/source4/dns_server/dlz_bind9.c
new file mode 100644
index 0000000..409e2f3
--- /dev/null
+++ b/source4/dns_server/dlz_bind9.c
@@ -0,0 +1,2219 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ bind9 dlz driver for Samba
+
+ Copyright (C) 2010 Andrew Tridgell
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "talloc.h"
+#include "param/param.h"
+#include "lib/events/events.h"
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/common/util.h"
+#include "auth/auth.h"
+#include "auth/session.h"
+#include "auth/gensec/gensec.h"
+#include "librpc/gen_ndr/security.h"
+#include "auth/credentials/credentials.h"
+#include "system/kerberos.h"
+#include "auth/kerberos/kerberos.h"
+#include "gen_ndr/ndr_dnsp.h"
+#include "gen_ndr/server_id.h"
+#include "messaging/messaging.h"
+#include <popt.h>
+#include "lib/util/dlinklist.h"
+#include "dlz_minimal.h"
+#include "dnsserver_common.h"
+#include "lib/util/smb_strtox.h"
+#include "lib/util/access.h"
+
+#undef strcasecmp
+
+struct b9_options {
+ const char *url;
+ const char *debug;
+};
+
+struct b9_zone {
+ char *name;
+ struct b9_zone *prev, *next;
+};
+
+struct dlz_bind9_data {
+ struct b9_options options;
+ struct ldb_context *samdb;
+ struct tevent_context *ev_ctx;
+ struct loadparm_context *lp;
+ int *transaction_token;
+ uint32_t soa_serial;
+ struct b9_zone *zonelist;
+
+ /* Used for dynamic update */
+ struct smb_krb5_context *smb_krb5_ctx;
+ struct auth4_context *auth_context;
+ struct auth_session_info *session_info;
+ char *update_name;
+
+ /* helper functions from the dlz_dlopen driver */
+ log_t *log;
+ dns_sdlz_putrr_t *putrr;
+ dns_sdlz_putnamedrr_t *putnamedrr;
+ dns_dlz_writeablezone_t *writeable_zone;
+};
+
+static struct dlz_bind9_data *dlz_bind9_state = NULL;
+static int dlz_bind9_state_ref_count = 0;
+
+static const char *zone_prefixes[] = {
+ "CN=MicrosoftDNS,DC=DomainDnsZones",
+ "CN=MicrosoftDNS,DC=ForestDnsZones",
+ "CN=MicrosoftDNS,CN=System",
+ NULL
+};
+
+/*
+ * Get a printable string representation of an isc_result_t
+ */
+static const char *isc_result_str( const isc_result_t result) {
+ switch (result) {
+ case ISC_R_SUCCESS:
+ return "ISC_R_SUCCESS";
+ case ISC_R_NOMEMORY:
+ return "ISC_R_NOMEMORY";
+ case ISC_R_NOPERM:
+ return "ISC_R_NOPERM";
+ case ISC_R_NOSPACE:
+ return "ISC_R_NOSPACE";
+ case ISC_R_NOTFOUND:
+ return "ISC_R_NOTFOUND";
+ case ISC_R_FAILURE:
+ return "ISC_R_FAILURE";
+ case ISC_R_NOTIMPLEMENTED:
+ return "ISC_R_NOTIMPLEMENTED";
+ case ISC_R_NOMORE:
+ return "ISC_R_NOMORE";
+ case ISC_R_INVALIDFILE:
+ return "ISC_R_INVALIDFILE";
+ case ISC_R_UNEXPECTED:
+ return "ISC_R_UNEXPECTED";
+ case ISC_R_FILENOTFOUND:
+ return "ISC_R_FILENOTFOUND";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+/*
+ return the version of the API
+ */
+_PUBLIC_ int dlz_version(unsigned int *flags)
+{
+ return DLZ_DLOPEN_VERSION;
+}
+
+/*
+ remember a helper function from the bind9 dlz_dlopen driver
+ */
+static void b9_add_helper(struct dlz_bind9_data *state, const char *helper_name, void *ptr)
+{
+ if (strcmp(helper_name, "log") == 0) {
+ state->log = ptr;
+ }
+ if (strcmp(helper_name, "putrr") == 0) {
+ state->putrr = ptr;
+ }
+ if (strcmp(helper_name, "putnamedrr") == 0) {
+ state->putnamedrr = ptr;
+ }
+ if (strcmp(helper_name, "writeable_zone") == 0) {
+ state->writeable_zone = ptr;
+ }
+}
+
+/*
+ * Add a trailing '.' if it's missing
+ */
+static const char *b9_format_fqdn(TALLOC_CTX *mem_ctx, const char *str)
+{
+ size_t len;
+ const char *tmp;
+
+ if (str == NULL || str[0] == '\0') {
+ return str;
+ }
+
+ len = strlen(str);
+ if (str[len-1] != '.') {
+ tmp = talloc_asprintf(mem_ctx, "%s.", str);
+ } else {
+ tmp = str;
+ }
+ return tmp;
+}
+
+/*
+ * Format a record for bind9.
+ *
+ * On failure/error returns false, OR sets *data to NULL.
+ * Callers should check for both!
+ */
+static bool b9_format(struct dlz_bind9_data *state,
+ TALLOC_CTX *mem_ctx,
+ struct dnsp_DnssrvRpcRecord *rec,
+ const char **type, const char **data)
+{
+ uint32_t i;
+ char *tmp;
+ const char *fqdn;
+
+ switch (rec->wType) {
+ case DNS_TYPE_A:
+ *type = "a";
+ *data = rec->data.ipv4;
+ break;
+
+ case DNS_TYPE_AAAA:
+ *type = "aaaa";
+ *data = rec->data.ipv6;
+ break;
+
+ case DNS_TYPE_CNAME:
+ *type = "cname";
+ *data = b9_format_fqdn(mem_ctx, rec->data.cname);
+ break;
+
+ case DNS_TYPE_TXT:
+ *type = "txt";
+ tmp = talloc_asprintf(mem_ctx, "\"%s\"", rec->data.txt.str[0]);
+ for (i=1; i<rec->data.txt.count; i++) {
+ talloc_asprintf_addbuf(&tmp, " \"%s\"", rec->data.txt.str[i]);
+ }
+ *data = tmp;
+ break;
+
+ case DNS_TYPE_PTR:
+ *type = "ptr";
+ *data = b9_format_fqdn(mem_ctx, rec->data.ptr);
+ break;
+
+ case DNS_TYPE_SRV:
+ *type = "srv";
+ fqdn = b9_format_fqdn(mem_ctx, rec->data.srv.nameTarget);
+ if (fqdn == NULL) {
+ return false;
+ }
+ *data = talloc_asprintf(mem_ctx, "%u %u %u %s",
+ rec->data.srv.wPriority,
+ rec->data.srv.wWeight,
+ rec->data.srv.wPort,
+ fqdn);
+ break;
+
+ case DNS_TYPE_MX:
+ *type = "mx";
+ fqdn = b9_format_fqdn(mem_ctx, rec->data.mx.nameTarget);
+ if (fqdn == NULL) {
+ return false;
+ }
+ *data = talloc_asprintf(mem_ctx, "%u %s",
+ rec->data.mx.wPriority, fqdn);
+ break;
+
+ case DNS_TYPE_NS:
+ *type = "ns";
+ *data = b9_format_fqdn(mem_ctx, rec->data.ns);
+ break;
+
+ case DNS_TYPE_SOA: {
+ const char *mname;
+ *type = "soa";
+
+ /* we need to fake the authoritative nameserver to
+ * point at ourselves. This is how AD DNS servers
+ * force clients to send updates to the right local DC
+ */
+ mname = talloc_asprintf(mem_ctx, "%s.%s.",
+ lpcfg_netbios_name(state->lp),
+ lpcfg_dnsdomain(state->lp));
+ if (mname == NULL) {
+ return false;
+ }
+ mname = strlower_talloc(mem_ctx, mname);
+ if (mname == NULL) {
+ return false;
+ }
+
+ fqdn = b9_format_fqdn(mem_ctx, rec->data.soa.rname);
+ if (fqdn == NULL) {
+ return false;
+ }
+
+ state->soa_serial = rec->data.soa.serial;
+
+ *data = talloc_asprintf(mem_ctx, "%s %s %u %u %u %u %u",
+ mname, fqdn,
+ rec->data.soa.serial,
+ rec->data.soa.refresh,
+ rec->data.soa.retry,
+ rec->data.soa.expire,
+ rec->data.soa.minimum);
+ break;
+ }
+
+ default:
+ state->log(ISC_LOG_ERROR, "samba_dlz b9_format: unhandled record type %u",
+ rec->wType);
+ return false;
+ }
+
+ return true;
+}
+
+static const struct {
+ enum dns_record_type dns_type;
+ const char *typestr;
+ bool single_valued;
+} dns_typemap[] = {
+ { DNS_TYPE_A, "A" , false},
+ { DNS_TYPE_AAAA, "AAAA" , false},
+ { DNS_TYPE_CNAME, "CNAME" , true},
+ { DNS_TYPE_TXT, "TXT" , false},
+ { DNS_TYPE_PTR, "PTR" , false},
+ { DNS_TYPE_SRV, "SRV" , false},
+ { DNS_TYPE_MX, "MX" , false},
+ { DNS_TYPE_NS, "NS" , false},
+ { DNS_TYPE_SOA, "SOA" , true},
+};
+
+
+/*
+ see if a DNS type is single valued
+ */
+static bool b9_single_valued(enum dns_record_type dns_type)
+{
+ int i;
+ for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
+ if (dns_typemap[i].dns_type == dns_type) {
+ return dns_typemap[i].single_valued;
+ }
+ }
+ return false;
+}
+
+/*
+ get a DNS_TYPE_* value from the corresponding string
+ */
+static bool b9_dns_type(const char *type, enum dns_record_type *dtype)
+{
+ int i;
+ for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
+ if (strcasecmp(dns_typemap[i].typestr, type) == 0) {
+ *dtype = dns_typemap[i].dns_type;
+ return true;
+ }
+ }
+ return false;
+}
+
+
+#define DNS_PARSE_STR(ret, str, sep, saveptr) do { \
+ (ret) = strtok_r(str, sep, &saveptr); \
+ if ((ret) == NULL) return false; \
+ } while (0)
+
+#define DNS_PARSE_UINT(ret, str, sep, saveptr) do { \
+ char *istr = strtok_r(str, sep, &saveptr); \
+ int error = 0;\
+ if ((istr) == NULL) return false; \
+ (ret) = smb_strtoul(istr, NULL, 10, &error, SMB_STR_STANDARD); \
+ if (error != 0) {\
+ return false;\
+ }\
+ } while (0)
+
+/*
+ parse a record from bind9
+ */
+static bool b9_parse(struct dlz_bind9_data *state,
+ const char *rdatastr,
+ struct dnsp_DnssrvRpcRecord *rec)
+{
+ char *full_name, *dclass, *type;
+ char *str, *tmp, *saveptr=NULL;
+ int i;
+
+ str = talloc_strdup(rec, rdatastr);
+ if (str == NULL) {
+ return false;
+ }
+
+ /* parse the SDLZ string form */
+ DNS_PARSE_STR(full_name, str, "\t", saveptr);
+ DNS_PARSE_UINT(rec->dwTtlSeconds, NULL, "\t", saveptr);
+ DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
+ DNS_PARSE_STR(type, NULL, "\t", saveptr);
+
+ /* construct the record */
+ for (i=0; i<ARRAY_SIZE(dns_typemap); i++) {
+ if (strcasecmp(type, dns_typemap[i].typestr) == 0) {
+ rec->wType = dns_typemap[i].dns_type;
+ break;
+ }
+ }
+ if (i == ARRAY_SIZE(dns_typemap)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: unsupported record type '%s' for '%s'",
+ type, full_name);
+ return false;
+ }
+
+ switch (rec->wType) {
+ case DNS_TYPE_A:
+ DNS_PARSE_STR(rec->data.ipv4, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_AAAA:
+ DNS_PARSE_STR(rec->data.ipv6, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_CNAME:
+ DNS_PARSE_STR(rec->data.cname, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_TXT:
+ rec->data.txt.count = 0;
+ rec->data.txt.str = talloc_array(rec, const char *, rec->data.txt.count);
+ tmp = strtok_r(NULL, "\t", &saveptr);
+ while (tmp) {
+ rec->data.txt.str = talloc_realloc(rec, rec->data.txt.str, const char *,
+ rec->data.txt.count+1);
+ if (tmp[0] == '"') {
+ /* Strip quotes */
+ rec->data.txt.str[rec->data.txt.count] = talloc_strndup(rec, &tmp[1], strlen(tmp)-2);
+ } else {
+ rec->data.txt.str[rec->data.txt.count] = talloc_strdup(rec, tmp);
+ }
+ rec->data.txt.count++;
+ tmp = strtok_r(NULL, " ", &saveptr);
+ }
+ break;
+
+ case DNS_TYPE_PTR:
+ DNS_PARSE_STR(rec->data.ptr, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_SRV:
+ DNS_PARSE_UINT(rec->data.srv.wPriority, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.srv.wWeight, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.srv.wPort, NULL, " ", saveptr);
+ DNS_PARSE_STR(rec->data.srv.nameTarget, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_MX:
+ DNS_PARSE_UINT(rec->data.mx.wPriority, NULL, " ", saveptr);
+ DNS_PARSE_STR(rec->data.mx.nameTarget, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_NS:
+ DNS_PARSE_STR(rec->data.ns, NULL, " ", saveptr);
+ break;
+
+ case DNS_TYPE_SOA:
+ DNS_PARSE_STR(rec->data.soa.mname, NULL, " ", saveptr);
+ DNS_PARSE_STR(rec->data.soa.rname, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.soa.serial, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.soa.refresh, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.soa.retry, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.soa.expire, NULL, " ", saveptr);
+ DNS_PARSE_UINT(rec->data.soa.minimum, NULL, " ", saveptr);
+ break;
+
+ default:
+ state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unhandled record type %u",
+ rec->wType);
+ return false;
+ }
+
+ /* we should be at the end of the buffer now */
+ if (strtok_r(NULL, "\t ", &saveptr) != NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz b9_parse: unexpected data at end of string for '%s'",
+ rdatastr);
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ send a resource record to bind9
+ */
+static isc_result_t b9_putrr(struct dlz_bind9_data *state,
+ void *handle, struct dnsp_DnssrvRpcRecord *rec,
+ const char **types)
+{
+ isc_result_t result;
+ const char *type, *data;
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+
+ if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
+ return ISC_R_FAILURE;
+ }
+
+ if (data == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ if (types) {
+ int i;
+ for (i=0; types[i]; i++) {
+ if (strcmp(types[i], type) == 0) break;
+ }
+ if (types[i] == NULL) {
+ /* skip it */
+ return ISC_R_SUCCESS;
+ }
+ }
+
+ result = state->putrr(handle, type, rec->dwTtlSeconds, data);
+ if (result != ISC_R_SUCCESS) {
+ state->log(ISC_LOG_ERROR, "Failed to put rr");
+ }
+ talloc_free(tmp_ctx);
+ return result;
+}
+
+
+/*
+ send a named resource record to bind9
+ */
+static isc_result_t b9_putnamedrr(struct dlz_bind9_data *state,
+ void *handle, const char *name,
+ struct dnsp_DnssrvRpcRecord *rec)
+{
+ isc_result_t result;
+ const char *type, *data;
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+
+ if (!b9_format(state, tmp_ctx, rec, &type, &data)) {
+ return ISC_R_FAILURE;
+ }
+
+ if (data == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ result = state->putnamedrr(handle, name, type, rec->dwTtlSeconds, data);
+ if (result != ISC_R_SUCCESS) {
+ state->log(ISC_LOG_ERROR, "Failed to put named rr '%s'", name);
+ }
+ talloc_free(tmp_ctx);
+ return result;
+}
+
+/*
+ parse options
+ */
+static isc_result_t parse_options(struct dlz_bind9_data *state,
+ unsigned int argc, const char **argv,
+ struct b9_options *options)
+{
+ int opt;
+ poptContext pc;
+ struct poptOption long_options[] = {
+ { "url", 'H', POPT_ARG_STRING, &options->url, 0, "database URL", "URL" },
+ { "debug", 'd', POPT_ARG_STRING, &options->debug, 0, "debug level", "DEBUG" },
+ {0}
+ };
+
+ pc = poptGetContext("dlz_bind9", argc, argv, long_options,
+ POPT_CONTEXT_KEEP_FIRST);
+ while ((opt = poptGetNextOpt(pc)) != -1) {
+ switch (opt) {
+ default:
+ state->log(ISC_LOG_ERROR, "dlz_bind9: Invalid option %s: %s",
+ poptBadOption(pc, 0), poptStrerror(opt));
+ poptFreeContext(pc);
+ return ISC_R_FAILURE;
+ }
+ }
+
+ poptFreeContext(pc);
+ return ISC_R_SUCCESS;
+}
+
+
+/*
+ * Create session info from PAC
+ * This is called as auth_context->generate_session_info_pac()
+ */
+static NTSTATUS b9_generate_session_info_pac(struct auth4_context *auth_context,
+ TALLOC_CTX *mem_ctx,
+ struct smb_krb5_context *smb_krb5_context,
+ DATA_BLOB *pac_blob,
+ const char *principal_name,
+ const struct tsocket_address *remote_addr,
+ uint32_t session_info_flags,
+ struct auth_session_info **session_info)
+{
+ NTSTATUS status;
+ struct auth_user_info_dc *user_info_dc;
+ TALLOC_CTX *tmp_ctx;
+
+ tmp_ctx = talloc_new(mem_ctx);
+ NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+ status = kerberos_pac_blob_to_user_info_dc(tmp_ctx,
+ *pac_blob,
+ smb_krb5_context->krb5_context,
+ &user_info_dc,
+ NULL,
+ NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return status;
+ }
+
+ if (!(user_info_dc->info->user_flags & NETLOGON_GUEST)) {
+ session_info_flags |= AUTH_SESSION_INFO_AUTHENTICATED;
+ }
+
+ session_info_flags |= AUTH_SESSION_INFO_SIMPLE_PRIVILEGES;
+
+ status = auth_generate_session_info(mem_ctx, auth_context->lp_ctx, NULL, user_info_dc,
+ session_info_flags, session_info);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return status;
+ }
+
+ talloc_free(tmp_ctx);
+ return status;
+}
+
+/* Callback for the DEBUG() system, to catch the remaining messages */
+static void b9_debug(void *private_ptr, int msg_level, const char *msg)
+{
+ static const int isc_log_map[] = {
+ ISC_LOG_CRITICAL, /* 0 */
+ ISC_LOG_ERROR, /* 1 */
+ ISC_LOG_WARNING, /* 2 */
+ ISC_LOG_NOTICE /* 3 */
+ };
+ struct dlz_bind9_data *state = private_ptr;
+ int isc_log_level;
+
+ if (msg_level >= ARRAY_SIZE(isc_log_map) || msg_level < 0) {
+ isc_log_level = ISC_LOG_INFO;
+ } else {
+ isc_log_level = isc_log_map[msg_level];
+ }
+ state->log(isc_log_level, "samba_dlz: %s", msg);
+}
+
+static int dlz_state_debug_unregister(struct dlz_bind9_data *state)
+{
+ /* Stop logging (to the bind9 logs) */
+ debug_set_callback(NULL, NULL);
+ return 0;
+}
+
+/*
+ called to initialise the driver
+ */
+_PUBLIC_ isc_result_t dlz_create(const char *dlzname,
+ unsigned int argc, const char **argv,
+ void **dbdata, ...)
+{
+ struct dlz_bind9_data *state;
+ const char *helper_name;
+ va_list ap;
+ isc_result_t result;
+ struct ldb_dn *dn;
+ NTSTATUS nt_status;
+ int ret;
+ char *errstring = NULL;
+
+ if (dlz_bind9_state != NULL) {
+ dlz_bind9_state->log(ISC_LOG_ERROR,
+ "samba_dlz: dlz_create ignored, #refs=%d",
+ dlz_bind9_state_ref_count);
+ *dbdata = dlz_bind9_state;
+ dlz_bind9_state_ref_count++;
+ return ISC_R_SUCCESS;
+ }
+
+ state = talloc_zero(NULL, struct dlz_bind9_data);
+ if (state == NULL) {
+ return ISC_R_NOMEMORY;
+ }
+
+ talloc_set_destructor(state, dlz_state_debug_unregister);
+
+ /* fill in the helper functions */
+ va_start(ap, dbdata);
+ while ((helper_name = va_arg(ap, const char *)) != NULL) {
+ b9_add_helper(state, helper_name, va_arg(ap, void*));
+ }
+ va_end(ap);
+
+ /* Do not install samba signal handlers */
+ fault_setup_disable();
+
+ /* Start logging (to the bind9 logs) */
+ debug_set_callback(state, b9_debug);
+
+ state->ev_ctx = s4_event_context_init(state);
+ if (state->ev_ctx == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ result = parse_options(state, argc, argv, &state->options);
+ if (result != ISC_R_SUCCESS) {
+ goto failed;
+ }
+
+ state->lp = loadparm_init_global(true);
+ if (state->lp == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ if (state->options.debug) {
+ lpcfg_do_global_parameter(state->lp, "log level", state->options.debug);
+ } else {
+ lpcfg_do_global_parameter(state->lp, "log level", "0");
+ }
+
+ if (smb_krb5_init_context(state, state->lp, &state->smb_krb5_ctx) != 0) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ nt_status = gensec_init();
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ state->auth_context = talloc_zero(state, struct auth4_context);
+ if (state->auth_context == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ if (state->options.url == NULL) {
+ state->options.url = talloc_asprintf(state,
+ "%s/dns/sam.ldb",
+ lpcfg_binddns_dir(state->lp));
+ if (state->options.url == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+
+ if (!file_exist(state->options.url)) {
+ state->options.url = talloc_asprintf(state,
+ "%s/dns/sam.ldb",
+ lpcfg_private_dir(state->lp));
+ if (state->options.url == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failed;
+ }
+ }
+ }
+
+ ret = samdb_connect_url(state,
+ state->ev_ctx,
+ state->lp,
+ system_session(state->lp),
+ 0,
+ state->options.url,
+ NULL,
+ &state->samdb,
+ &errstring);
+ if (ret != LDB_SUCCESS) {
+ state->log(ISC_LOG_ERROR,
+ "samba_dlz: Failed to connect to %s: %s",
+ errstring, ldb_strerror(ret));
+ result = ISC_R_FAILURE;
+ goto failed;
+ }
+
+ dn = ldb_get_default_basedn(state->samdb);
+ if (dn == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: Unable to get basedn for %s - %s",
+ state->options.url, ldb_errstring(state->samdb));
+ result = ISC_R_FAILURE;
+ goto failed;
+ }
+
+ state->log(ISC_LOG_INFO, "samba_dlz: started for DN %s",
+ ldb_dn_get_linearized(dn));
+
+ state->auth_context->event_ctx = state->ev_ctx;
+ state->auth_context->lp_ctx = state->lp;
+ state->auth_context->sam_ctx = state->samdb;
+ state->auth_context->generate_session_info_pac = b9_generate_session_info_pac;
+
+ *dbdata = state;
+ dlz_bind9_state = state;
+ dlz_bind9_state_ref_count++;
+
+ return ISC_R_SUCCESS;
+
+failed:
+ state->log(ISC_LOG_INFO,
+ "samba_dlz: FAILED dlz_create call result=%d #refs=%d",
+ result,
+ dlz_bind9_state_ref_count);
+ talloc_free(state);
+ return result;
+}
+
+/*
+ shutdown the backend
+ */
+_PUBLIC_ void dlz_destroy(void *dbdata)
+{
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+
+ dlz_bind9_state_ref_count--;
+ if (dlz_bind9_state_ref_count == 0) {
+ state->log(ISC_LOG_INFO, "samba_dlz: shutting down");
+ talloc_unlink(state, state->samdb);
+ talloc_free(state);
+ dlz_bind9_state = NULL;
+ } else {
+ state->log(ISC_LOG_INFO,
+ "samba_dlz: dlz_destroy called. %d refs remaining.",
+ dlz_bind9_state_ref_count);
+ }
+}
+
+
+/*
+ return the base DN for a zone
+ */
+static isc_result_t b9_find_zone_dn(struct dlz_bind9_data *state, const char *zone_name,
+ TALLOC_CTX *mem_ctx, struct ldb_dn **zone_dn)
+{
+ int ret;
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+ const char *attrs[] = { NULL };
+ int i;
+
+ for (i=0; zone_prefixes[i]; i++) {
+ const char *casefold;
+ struct ldb_dn *dn;
+ struct ldb_result *res;
+ struct ldb_val zone_name_val
+ = data_blob_string_const(zone_name);
+
+ dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
+ if (dn == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ /*
+ * This dance ensures that it is not possible to put
+ * (eg) an extra DC=x, into the DNS name being
+ * queried
+ */
+
+ if (!ldb_dn_add_child_fmt(dn,
+ "DC=X,%s",
+ zone_prefixes[i])) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ ret = ldb_dn_set_component(dn,
+ 0,
+ "DC",
+ zone_name_val);
+ if (ret != LDB_SUCCESS) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ /*
+ * Check if this is a plausibly valid DN early
+ * (time spent here will be saved during the
+ * search due to an internal cache)
+ */
+ casefold = ldb_dn_get_casefold(dn);
+
+ if (casefold == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOTFOUND;
+ }
+
+ ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, "objectClass=dnsZone");
+ if (ret == LDB_SUCCESS) {
+ if (zone_dn != NULL) {
+ *zone_dn = talloc_steal(mem_ctx, dn);
+ }
+ talloc_free(tmp_ctx);
+ return ISC_R_SUCCESS;
+ }
+ talloc_free(dn);
+ }
+
+ talloc_free(tmp_ctx);
+ return ISC_R_NOTFOUND;
+}
+
+
+/*
+ return the DN for a name. The record does not need to exist, but the
+ zone must exist
+ */
+static isc_result_t b9_find_name_dn(struct dlz_bind9_data *state, const char *name,
+ TALLOC_CTX *mem_ctx, struct ldb_dn **dn)
+{
+ const char *p;
+
+ /* work through the name piece by piece, until we find a zone */
+ for (p=name; p; ) {
+ isc_result_t result;
+ result = b9_find_zone_dn(state, p, mem_ctx, dn);
+ if (result == ISC_R_SUCCESS) {
+ const char *casefold;
+
+ /* we found a zone, now extend the DN to get
+ * the full DN
+ */
+ bool ret;
+ if (p == name) {
+ ret = ldb_dn_add_child_fmt(*dn, "DC=@");
+ if (ret == false) {
+ talloc_free(*dn);
+ return ISC_R_NOMEMORY;
+ }
+ } else {
+ struct ldb_val name_val
+ = data_blob_const(name,
+ (int)(p-name)-1);
+
+ if (!ldb_dn_add_child_val(*dn,
+ "DC",
+ name_val)) {
+ talloc_free(*dn);
+ return ISC_R_NOMEMORY;
+ }
+ }
+
+ /*
+ * Check if this is a plausibly valid DN early
+ * (time spent here will be saved during the
+ * search due to an internal cache)
+ */
+ casefold = ldb_dn_get_casefold(*dn);
+
+ if (casefold == NULL) {
+ return ISC_R_NOTFOUND;
+ }
+
+ return ISC_R_SUCCESS;
+ }
+ p = strchr(p, '.');
+ if (p == NULL) {
+ break;
+ }
+ p++;
+ }
+ return ISC_R_NOTFOUND;
+}
+
+
+/*
+ see if we handle a given zone
+ */
+_PUBLIC_ isc_result_t dlz_findzonedb(void *dbdata, const char *name,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ isc_result_t result = ISC_R_SUCCESS;
+
+ result = b9_find_zone_dn(state, name, NULL, NULL);
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ NULL,
+ name,
+ NULL);
+ return result;
+}
+
+
+/*
+ lookup one record
+ */
+static isc_result_t dlz_lookup_types(struct dlz_bind9_data *state,
+ const char *zone, const char *name,
+ dns_sdlzlookup_t *lookup,
+ const char **types)
+{
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+ struct ldb_dn *dn;
+ WERROR werr = WERR_DNS_ERROR_NAME_DOES_NOT_EXIST;
+ struct dnsp_DnssrvRpcRecord *records = NULL;
+ uint16_t num_records = 0, i;
+ struct ldb_val zone_name_val
+ = data_blob_string_const(zone);
+ struct ldb_val name_val
+ = data_blob_string_const(name);
+
+ for (i=0; zone_prefixes[i]; i++) {
+ int ret;
+ const char *casefold;
+ dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
+ if (dn == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ /*
+ * This dance ensures that it is not possible to put
+ * (eg) an extra DC=x, into the DNS name being
+ * queried
+ */
+
+ if (!ldb_dn_add_child_fmt(dn,
+ "DC=X,DC=X,%s",
+ zone_prefixes[i])) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ ret = ldb_dn_set_component(dn,
+ 1,
+ "DC",
+ zone_name_val);
+ if (ret != LDB_SUCCESS) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ ret = ldb_dn_set_component(dn,
+ 0,
+ "DC",
+ name_val);
+ if (ret != LDB_SUCCESS) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ /*
+ * Check if this is a plausibly valid DN early
+ * (time spent here will be saved during the
+ * search due to an internal cache)
+ */
+ casefold = ldb_dn_get_casefold(dn);
+
+ if (casefold == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOTFOUND;
+ }
+
+ werr = dns_common_wildcard_lookup(state->samdb, tmp_ctx, dn,
+ &records, &num_records);
+ if (W_ERROR_IS_OK(werr)) {
+ break;
+ }
+ }
+ if (!W_ERROR_IS_OK(werr)) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOTFOUND;
+ }
+
+ for (i=0; i < num_records; i++) {
+ isc_result_t result;
+
+ result = b9_putrr(state, lookup, &records[i], types);
+ if (result != ISC_R_SUCCESS) {
+ talloc_free(tmp_ctx);
+ return result;
+ }
+ }
+
+ talloc_free(tmp_ctx);
+ return ISC_R_SUCCESS;
+}
+
+/*
+ lookup one record
+ */
+_PUBLIC_ isc_result_t dlz_lookup(const char *zone, const char *name,
+ void *dbdata, dns_sdlzlookup_t *lookup,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo)
+{
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ isc_result_t result = ISC_R_SUCCESS;
+ struct timeval start = timeval_current();
+
+ result = dlz_lookup_types(state, zone, name, lookup, NULL);
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ zone,
+ name,
+ NULL);
+
+ return result;
+}
+
+
+/*
+ see if a zone transfer is allowed
+ */
+_PUBLIC_ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client)
+{
+ struct dlz_bind9_data *state = talloc_get_type(
+ dbdata, struct dlz_bind9_data);
+ isc_result_t ret;
+ const char **authorized_clients, **denied_clients;
+ const char *cname="";
+
+ /* check that the zone is known */
+ ret = b9_find_zone_dn(state, name, NULL, NULL);
+ if (ret != ISC_R_SUCCESS) {
+ return ret;
+ }
+
+ /* default is to deny all transfers */
+
+ authorized_clients = lpcfg_dns_zone_transfer_clients_allow(state->lp);
+ denied_clients = lpcfg_dns_zone_transfer_clients_deny(state->lp);
+
+ /* The logic of allow_access() when both allow and deny lists are given
+ * does not match our expectation here: it would allow clients that are
+ * neither allowed nor denied.
+ * Here, we want to deny clients by default.
+ * Using the allow_access() function is still useful as it takes care of
+ * parsing IP addresses and subnets in a consistent way with other options
+ * from smb.conf.
+ *
+ * We will then check the deny list first, then the allow list, so that
+ * we accept only clients that are explicitly allowed AND not explicitly
+ * denied.
+ */
+ if ((authorized_clients == NULL) && (denied_clients == NULL)) {
+ /* No "allow" or "deny" lists given. Deny by default. */
+ return ISC_R_NOPERM;
+ }
+
+ if (denied_clients != NULL) {
+ bool ok = allow_access(denied_clients, NULL, cname, client);
+ if (!ok) {
+ /* client on deny list. Deny. */
+ return ISC_R_NOPERM;
+ }
+ }
+
+ if (authorized_clients != NULL) {
+ bool ok = allow_access(NULL, authorized_clients, cname, client);
+ if (ok) {
+ /*
+ * client is not on deny list and is on allow list.
+ * This is the only place we should return "allow".
+ */
+ return ISC_R_SUCCESS;
+ }
+ }
+ /* We shouldn't get here, but deny by default. */
+ return ISC_R_NOPERM;
+}
+
+/*
+ perform a zone transfer
+ */
+_PUBLIC_ isc_result_t dlz_allnodes(const char *zone, void *dbdata,
+ dns_sdlzallnodes_t *allnodes)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ const char *attrs[] = { "dnsRecord", NULL };
+ int ret = LDB_ERR_NO_SUCH_OBJECT;
+ size_t i, j;
+ struct ldb_dn *dn = NULL;
+ struct ldb_result *res;
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+ struct ldb_val zone_name_val = data_blob_string_const(zone);
+ isc_result_t result = ISC_R_SUCCESS;
+
+ for (i=0; zone_prefixes[i]; i++) {
+ const char *casefold;
+
+ dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
+ if (dn == NULL) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ /*
+ * This dance ensures that it is not possible to put
+ * (eg) an extra DC=x, into the DNS name being
+ * queried
+ */
+
+ if (!ldb_dn_add_child_fmt(dn,
+ "DC=X,%s",
+ zone_prefixes[i])) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ ret = ldb_dn_set_component(dn,
+ 0,
+ "DC",
+ zone_name_val);
+ if (ret != LDB_SUCCESS) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ /*
+ * Check if this is a plausibly valid DN early
+ * (time spent here will be saved during the
+ * search due to an internal cache)
+ */
+ casefold = ldb_dn_get_casefold(dn);
+
+ if (casefold == NULL) {
+ result = ISC_R_NOTFOUND;
+ goto exit;
+ }
+
+ ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
+ attrs, "objectClass=dnsNode");
+ if (ret == LDB_SUCCESS) {
+ break;
+ }
+ }
+ if (ret != LDB_SUCCESS || dn == NULL) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOTFOUND;
+ goto exit;
+ }
+
+ for (i=0; i<res->count; i++) {
+ struct ldb_message_element *el;
+ TALLOC_CTX *el_ctx = talloc_new(tmp_ctx);
+ const char *rdn, *name;
+ const struct ldb_val *v;
+ WERROR werr;
+ struct dnsp_DnssrvRpcRecord *recs = NULL;
+ uint16_t num_recs = 0;
+
+ el = ldb_msg_find_element(res->msgs[i], "dnsRecord");
+ if (el == NULL || el->num_values == 0) {
+ state->log(ISC_LOG_INFO, "failed to find dnsRecord for %s",
+ ldb_dn_get_linearized(dn));
+ talloc_free(el_ctx);
+ continue;
+ }
+
+ v = ldb_dn_get_rdn_val(res->msgs[i]->dn);
+ if (v == NULL) {
+ state->log(ISC_LOG_INFO, "failed to find RDN for %s",
+ ldb_dn_get_linearized(dn));
+ talloc_free(el_ctx);
+ continue;
+ }
+
+ rdn = talloc_strndup(el_ctx, (char *)v->data, v->length);
+ if (rdn == NULL) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ if (strcmp(rdn, "@") == 0) {
+ name = zone;
+ } else {
+ name = talloc_asprintf(el_ctx, "%s.%s", rdn, zone);
+ }
+ name = b9_format_fqdn(el_ctx, name);
+ if (name == NULL) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ werr = dns_common_extract(state->samdb, el, el_ctx, &recs, &num_recs);
+ if (!W_ERROR_IS_OK(werr)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
+ ldb_dn_get_linearized(dn), win_errstr(werr));
+ talloc_free(el_ctx);
+ continue;
+ }
+
+ for (j=0; j < num_recs; j++) {
+ isc_result_t rc;
+
+ rc = b9_putnamedrr(state, allnodes, name, &recs[j]);
+ if (rc != ISC_R_SUCCESS) {
+ continue;
+ }
+ }
+
+ talloc_free(el_ctx);
+ }
+
+ talloc_free(tmp_ctx);
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ zone,
+ NULL,
+ NULL);
+ return result;
+}
+
+
+/*
+ start a transaction
+ */
+_PUBLIC_ isc_result_t dlz_newversion(const char *zone, void *dbdata, void **versionp)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ isc_result_t result = ISC_R_SUCCESS;
+
+ state->log(ISC_LOG_INFO, "samba_dlz: starting transaction on zone %s", zone);
+
+ if (state->transaction_token != NULL) {
+ state->log(ISC_LOG_INFO, "samba_dlz: transaction already started for zone %s", zone);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ state->transaction_token = talloc_zero(state, int);
+ if (state->transaction_token == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ if (ldb_transaction_start(state->samdb) != LDB_SUCCESS) {
+ state->log(ISC_LOG_INFO, "samba_dlz: failed to start a transaction for zone %s", zone);
+ talloc_free(state->transaction_token);
+ state->transaction_token = NULL;
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ *versionp = (void *)state->transaction_token;
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ zone,
+ NULL,
+ NULL);
+ return result;
+}
+
+/*
+ end a transaction
+ */
+_PUBLIC_ void dlz_closeversion(const char *zone, isc_boolean_t commit,
+ void *dbdata, void **versionp)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ const char *data = NULL;
+
+ data = commit ? "commit" : "cancel";
+
+ if (state->transaction_token != (int *)*versionp) {
+ state->log(ISC_LOG_INFO, "samba_dlz: transaction not started for zone %s", zone);
+ goto exit;
+ }
+
+ if (commit) {
+ if (ldb_transaction_commit(state->samdb) != LDB_SUCCESS) {
+ state->log(ISC_LOG_INFO, "samba_dlz: failed to commit a transaction for zone %s", zone);
+ goto exit;
+ }
+ state->log(ISC_LOG_INFO, "samba_dlz: committed transaction on zone %s", zone);
+ } else {
+ if (ldb_transaction_cancel(state->samdb) != LDB_SUCCESS) {
+ state->log(ISC_LOG_INFO, "samba_dlz: failed to cancel a transaction for zone %s", zone);
+ goto exit;
+ }
+ state->log(ISC_LOG_INFO, "samba_dlz: cancelling transaction on zone %s", zone);
+ }
+
+ talloc_free(state->transaction_token);
+ state->transaction_token = NULL;
+ *versionp = NULL;
+
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(ISC_R_SUCCESS),
+ &start,
+ zone,
+ NULL,
+ data);
+}
+
+
+/*
+ see if there is a SOA record for a zone
+ */
+static bool b9_has_soa(struct dlz_bind9_data *state, struct ldb_dn *dn, const char *zone)
+{
+ TALLOC_CTX *tmp_ctx = talloc_new(state);
+ WERROR werr;
+ struct dnsp_DnssrvRpcRecord *records = NULL;
+ uint16_t num_records = 0, i;
+ struct ldb_val zone_name_val
+ = data_blob_string_const(zone);
+
+ /*
+ * This dance ensures that it is not possible to put
+ * (eg) an extra DC=x, into the DNS name being
+ * queried
+ */
+
+ if (!ldb_dn_add_child_val(dn,
+ "DC",
+ zone_name_val)) {
+ talloc_free(tmp_ctx);
+ return false;
+ }
+
+ /*
+ * The SOA record is always stored under DC=@,DC=zonename
+ * This can probably be removed when dns_common_lookup makes a fallback
+ * lookup on @ pseudo record
+ */
+
+ if (!ldb_dn_add_child_fmt(dn,"DC=@")) {
+ talloc_free(tmp_ctx);
+ return false;
+ }
+
+ werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
+ &records, &num_records, NULL);
+ if (!W_ERROR_IS_OK(werr)) {
+ talloc_free(tmp_ctx);
+ return false;
+ }
+
+ for (i=0; i < num_records; i++) {
+ if (records[i].wType == DNS_TYPE_SOA) {
+ talloc_free(tmp_ctx);
+ return true;
+ }
+ }
+
+ talloc_free(tmp_ctx);
+ return false;
+}
+
+static bool b9_zone_add(struct dlz_bind9_data *state, const char *name)
+{
+ struct b9_zone *zone;
+
+ zone = talloc_zero(state, struct b9_zone);
+ if (zone == NULL) {
+ return false;
+ }
+
+ zone->name = talloc_strdup(zone, name);
+ if (zone->name == NULL) {
+ talloc_free(zone);
+ return false;
+ }
+
+ DLIST_ADD(state->zonelist, zone);
+ return true;
+}
+
+static bool b9_zone_exists(struct dlz_bind9_data *state, const char *name)
+{
+ struct b9_zone *zone = state->zonelist;
+ bool found = false;
+
+ while (zone != NULL) {
+ if (strcasecmp(name, zone->name) == 0) {
+ found = true;
+ break;
+ }
+ zone = zone->next;
+ }
+
+ return found;
+}
+
+
+/*
+ configure a writeable zone
+ */
+_PUBLIC_ isc_result_t dlz_configure(dns_view_t *view, dns_dlzdb_t *dlzdb,
+ void *dbdata)
+{
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ TALLOC_CTX *tmp_ctx;
+ struct ldb_dn *dn;
+ int i;
+
+ state->log(ISC_LOG_INFO, "samba_dlz: starting configure");
+ if (state->writeable_zone == NULL) {
+ state->log(ISC_LOG_INFO, "samba_dlz: no writeable_zone method available");
+ return ISC_R_FAILURE;
+ }
+
+ tmp_ctx = talloc_new(state);
+
+ for (i=0; zone_prefixes[i]; i++) {
+ const char *attrs[] = { "name", NULL };
+ int j, ret;
+ struct ldb_result *res;
+
+ dn = ldb_dn_copy(tmp_ctx, ldb_get_default_basedn(state->samdb));
+ if (dn == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ if (!ldb_dn_add_child_fmt(dn, "%s", zone_prefixes[i])) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_SUBTREE,
+ attrs, "objectClass=dnsZone");
+ if (ret != LDB_SUCCESS) {
+ continue;
+ }
+
+ for (j=0; j<res->count; j++) {
+ isc_result_t result;
+ const char *zone = ldb_msg_find_attr_as_string(res->msgs[j], "name", NULL);
+ struct ldb_dn *zone_dn;
+
+ if (zone == NULL) {
+ continue;
+ }
+ /* Ignore zones that are not handled in BIND */
+ if ((strcmp(zone, "RootDNSServers") == 0) ||
+ (strcmp(zone, "..TrustAnchors") == 0)) {
+ continue;
+ }
+ zone_dn = ldb_dn_copy(tmp_ctx, dn);
+ if (zone_dn == NULL) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ if (!b9_has_soa(state, zone_dn, zone)) {
+ continue;
+ }
+
+ if (b9_zone_exists(state, zone)) {
+ state->log(ISC_LOG_WARNING, "samba_dlz: Ignoring duplicate zone '%s' from '%s'",
+ zone, ldb_dn_get_linearized(zone_dn));
+ continue;
+ }
+
+ if (!b9_zone_add(state, zone)) {
+ talloc_free(tmp_ctx);
+ return ISC_R_NOMEMORY;
+ }
+
+ result = state->writeable_zone(view, dlzdb, zone);
+ if (result != ISC_R_SUCCESS) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: Failed to configure zone '%s'",
+ zone);
+ talloc_free(tmp_ctx);
+ return result;
+ }
+ state->log(ISC_LOG_INFO, "samba_dlz: configured writeable zone '%s'", zone);
+ }
+ }
+
+ talloc_free(tmp_ctx);
+ return ISC_R_SUCCESS;
+}
+
+/*
+ authorize a zone update
+ */
+_PUBLIC_ isc_boolean_t dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
+ const char *type, const char *key, uint32_t keydatalen, uint8_t *keydata,
+ void *dbdata)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ TALLOC_CTX *tmp_ctx;
+ DATA_BLOB ap_req;
+ struct cli_credentials *server_credentials;
+ char *keytab_name;
+ char *keytab_file = NULL;
+ int ret;
+ int ldb_ret;
+ NTSTATUS nt_status;
+ struct gensec_security *gensec_ctx;
+ struct auth_session_info *session_info;
+ struct ldb_dn *dn;
+ isc_result_t rc;
+ struct ldb_result *res;
+ const char * attrs[] = { NULL };
+ uint32_t access_mask;
+ struct gensec_settings *settings = NULL;
+ const struct gensec_security_ops **backends = NULL;
+ size_t idx = 0;
+ isc_boolean_t result = ISC_FALSE;
+ NTSTATUS status;
+ bool ok;
+
+ /* Remove cached credentials, if any */
+ if (state->session_info) {
+ talloc_free(state->session_info);
+ state->session_info = NULL;
+ }
+ if (state->update_name) {
+ talloc_free(state->update_name);
+ state->update_name = NULL;
+ }
+
+ tmp_ctx = talloc_new(state);
+ if (tmp_ctx == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: no memory");
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ ap_req = data_blob_const(keydata, keydatalen);
+ server_credentials = cli_credentials_init(tmp_ctx);
+ if (!server_credentials) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to init server credentials");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ status = cli_credentials_set_krb5_context(server_credentials,
+ state->smb_krb5_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ state->log(ISC_LOG_ERROR,
+ "samba_dlz: failed to set krb5 context");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ ok = cli_credentials_set_conf(server_credentials, state->lp);
+ if (!ok) {
+ state->log(ISC_LOG_ERROR,
+ "samba_dlz: failed to load smb.conf");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ keytab_file = talloc_asprintf(tmp_ctx,
+ "%s/dns.keytab",
+ lpcfg_binddns_dir(state->lp));
+ if (keytab_file == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ if (!file_exist(keytab_file)) {
+ keytab_file = talloc_asprintf(tmp_ctx,
+ "%s/dns.keytab",
+ lpcfg_private_dir(state->lp));
+ if (keytab_file == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+ }
+
+ keytab_name = talloc_asprintf(tmp_ctx, "FILE:%s", keytab_file);
+ if (keytab_name == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: Out of memory!");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ ret = cli_credentials_set_keytab_name(server_credentials, state->lp, keytab_name,
+ CRED_SPECIFIED);
+ if (ret != 0) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to obtain server credentials from %s",
+ keytab_name);
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+ talloc_free(keytab_name);
+
+ settings = lpcfg_gensec_settings(tmp_ctx, state->lp);
+ if (settings == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: lpcfg_gensec_settings failed");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+ backends = talloc_zero_array(settings,
+ const struct gensec_security_ops *, 3);
+ if (backends == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: talloc_zero_array gensec_security_ops failed");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+ settings->backends = backends;
+
+ gensec_init();
+
+ backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_KERBEROS5);
+ backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_SPNEGO);
+
+ nt_status = gensec_server_start(tmp_ctx, settings,
+ state->auth_context, &gensec_ctx);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to start gensec server");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ gensec_set_credentials(gensec_ctx, server_credentials);
+
+ nt_status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to start spnego");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ /*
+ * We only allow SPNEGO/KRB5 and make sure the backend
+ * to is RPC/IPC free.
+ *
+ * See gensec_gssapi_update_internal() as
+ * GENSEC_SERVER.
+ *
+ * It allows gensec_update() not to block.
+ *
+ * If that changes in future we need to use
+ * gensec_update_send/recv here!
+ */
+ nt_status = gensec_update(gensec_ctx, tmp_ctx, ap_req, &ap_req);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: spnego update failed");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ nt_status = gensec_session_info(gensec_ctx, tmp_ctx, &session_info);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to create session info");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ /* Get the DN from name */
+ rc = b9_find_name_dn(state, name, tmp_ctx, &dn);
+ if (rc != ISC_R_SUCCESS) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to find name %s", name);
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ /* make sure the dn exists, or find parent dn in case new object is being added */
+ ldb_ret = ldb_search(state->samdb, tmp_ctx, &res, dn, LDB_SCOPE_BASE,
+ attrs, "objectClass=dnsNode");
+ if (ldb_ret == LDB_ERR_NO_SUCH_OBJECT) {
+ ldb_dn_remove_child_components(dn, 1);
+ access_mask = SEC_ADS_CREATE_CHILD;
+ talloc_free(res);
+ } else if (ldb_ret == LDB_SUCCESS) {
+ access_mask = SEC_STD_REQUIRED | SEC_ADS_SELF_WRITE;
+ talloc_free(res);
+ } else {
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ /* Do ACL check */
+ ldb_ret = dsdb_check_access_on_dn(state->samdb, tmp_ctx, dn,
+ session_info->security_token,
+ access_mask, NULL);
+ if (ldb_ret != LDB_SUCCESS) {
+ state->log(ISC_LOG_INFO,
+ "samba_dlz: disallowing update of signer=%s name=%s type=%s error=%s",
+ signer, name, type, ldb_strerror(ldb_ret));
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+
+ /* Cache session_info, so it can be used in the actual add/delete operation */
+ state->update_name = talloc_strdup(state, name);
+ if (state->update_name == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: memory allocation error");
+ talloc_free(tmp_ctx);
+ result = ISC_FALSE;
+ goto exit;
+ }
+ state->session_info = talloc_steal(state, session_info);
+
+ state->log(ISC_LOG_INFO, "samba_dlz: allowing update of signer=%s name=%s tcpaddr=%s type=%s key=%s",
+ signer, name, tcpaddr, type, key);
+
+ talloc_free(tmp_ctx);
+ result = ISC_TRUE;
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ NULL,
+ name,
+ NULL);
+ return result;
+}
+
+
+/*
+ see if two dns records match
+ */
+static bool b9_record_match(struct dnsp_DnssrvRpcRecord *rec1,
+ struct dnsp_DnssrvRpcRecord *rec2)
+{
+ if (rec1->wType != rec2->wType) {
+ return false;
+ }
+ /* see if this type is single valued */
+ if (b9_single_valued(rec1->wType)) {
+ return true;
+ }
+
+ return dns_record_match(rec1, rec2);
+}
+
+/*
+ * Update session_info on samdb using the cached credentials
+ */
+static bool b9_set_session_info(struct dlz_bind9_data *state, const char *name)
+{
+ int ret;
+
+ if (state->update_name == NULL || state->session_info == NULL) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: invalid credentials");
+ return false;
+ }
+
+ /* Do not use client credentials, if we're not updating the client specified name */
+ if (strcmp(state->update_name, name) != 0) {
+ return true;
+ }
+
+ ret = ldb_set_opaque(
+ state->samdb,
+ DSDB_SESSION_INFO,
+ state->session_info);
+ if (ret != LDB_SUCCESS) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: unable to set session info");
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * Reset session_info on samdb as system session
+ */
+static void b9_reset_session_info(struct dlz_bind9_data *state)
+{
+ ldb_set_opaque(
+ state->samdb,
+ DSDB_SESSION_INFO,
+ system_session(state->lp));
+}
+
+/*
+ add or modify a rdataset
+ */
+_PUBLIC_ isc_result_t dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ struct dnsp_DnssrvRpcRecord *rec;
+ struct ldb_dn *dn;
+ isc_result_t result = ISC_R_SUCCESS;
+ bool tombstoned = false;
+ bool needs_add = false;
+ struct dnsp_DnssrvRpcRecord *recs = NULL;
+ uint16_t num_recs = 0;
+ uint16_t first = 0;
+ uint16_t i;
+ WERROR werr;
+
+ if (state->transaction_token != (void*)version) {
+ state->log(ISC_LOG_INFO, "samba_dlz: bad transaction version");
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
+ if (rec == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ rec->rank = DNS_RANK_ZONE;
+
+ if (!b9_parse(state, rdatastr, rec)) {
+ state->log(ISC_LOG_INFO, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ /* find the DN of the record */
+ result = b9_find_name_dn(state, name, rec, &dn);
+ if (result != ISC_R_SUCCESS) {
+ talloc_free(rec);
+ goto exit;
+ }
+
+ /* get any existing records */
+ werr = dns_common_lookup(state->samdb, rec, dn,
+ &recs, &num_recs, &tombstoned);
+ if (W_ERROR_EQUAL(werr, WERR_DNS_ERROR_NAME_DOES_NOT_EXIST)) {
+ needs_add = true;
+ werr = WERR_OK;
+ }
+ if (!W_ERROR_IS_OK(werr)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse dnsRecord for %s, %s",
+ ldb_dn_get_linearized(dn), win_errstr(werr));
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ if (tombstoned) {
+ /*
+ * we need to keep the existing tombstone record
+ * and ignore it
+ */
+ first = num_recs;
+ }
+
+ /* there may be existing records. We need to see if this will
+ * replace a record or add to it
+ */
+ for (i=first; i < num_recs; i++) {
+ if (b9_record_match(rec, &recs[i])) {
+ break;
+ }
+ }
+ if (i == UINT16_MAX) {
+ state->log(ISC_LOG_ERROR,
+ "samba_dlz: failed to find record to modify, and "
+ "there are already %u dnsRecord values for %s",
+ i, ldb_dn_get_linearized(dn));
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ if (i == num_recs) {
+ /* set dwTimeStamp before increasing num_recs */
+ if (dns_name_is_static(recs, num_recs)) {
+ rec->dwTimeStamp = 0;
+ } else {
+ rec->dwTimeStamp = unix_to_dns_timestamp(time(NULL));
+ }
+ /* adding space for a new value */
+ recs = talloc_realloc(rec, recs,
+ struct dnsp_DnssrvRpcRecord,
+ num_recs + 1);
+ if (recs == NULL) {
+ talloc_free(rec);
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+ num_recs++;
+ } else {
+ /*
+ * We are updating a record. Depending on whether aging is
+ * enabled, and how old the old timestamp is,
+ * dns_common_replace() will work out whether to bump the
+ * timestamp or not. But to do that, we need to tell it the
+ * old timestamp.
+ */
+ if (! dns_name_is_static(recs, num_recs)) {
+ rec->dwTimeStamp = recs[i].dwTimeStamp;
+ }
+ }
+
+ recs[i] = *rec;
+
+ if (!b9_set_session_info(state, name)) {
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ /* modify the record */
+ werr = dns_common_replace(state->samdb, rec, dn,
+ needs_add,
+ state->soa_serial,
+ recs, num_recs);
+ b9_reset_session_info(state);
+ if (!W_ERROR_IS_OK(werr)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to %s %s - %s",
+ needs_add ? "add" : "modify",
+ ldb_dn_get_linearized(dn), win_errstr(werr));
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ state->log(ISC_LOG_INFO, "samba_dlz: added rdataset %s '%s'", name, rdatastr);
+
+ talloc_free(rec);
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ NULL,
+ name,
+ rdatastr);
+ return result;
+}
+
+/*
+ remove a rdataset
+ */
+_PUBLIC_ isc_result_t dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata, void *version)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ struct dnsp_DnssrvRpcRecord *rec;
+ struct ldb_dn *dn;
+ isc_result_t result = ISC_R_SUCCESS;
+ struct dnsp_DnssrvRpcRecord *recs = NULL;
+ uint16_t num_recs = 0;
+ uint16_t i;
+ WERROR werr;
+
+ if (state->transaction_token != (void*)version) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ rec = talloc_zero(state, struct dnsp_DnssrvRpcRecord);
+ if (rec == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto exit;
+ }
+
+ if (!b9_parse(state, rdatastr, rec)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to parse rdataset '%s'", rdatastr);
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ /* find the DN of the record */
+ result = b9_find_name_dn(state, name, rec, &dn);
+ if (result != ISC_R_SUCCESS) {
+ talloc_free(rec);
+ goto exit;
+ }
+
+ /* get the existing records */
+ werr = dns_common_lookup(state->samdb, rec, dn,
+ &recs, &num_recs, NULL);
+ if (!W_ERROR_IS_OK(werr)) {
+ talloc_free(rec);
+ result = ISC_R_NOTFOUND;
+ goto exit;
+ }
+
+ for (i=0; i < num_recs; i++) {
+ if (b9_record_match(rec, &recs[i])) {
+ recs[i] = (struct dnsp_DnssrvRpcRecord) {
+ .wType = DNS_TYPE_TOMBSTONE,
+ };
+ break;
+ }
+ }
+ if (i == num_recs) {
+ talloc_free(rec);
+ result = ISC_R_NOTFOUND;
+ goto exit;
+ }
+
+ if (!b9_set_session_info(state, name)) {
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ /* modify the record */
+ werr = dns_common_replace(state->samdb, rec, dn,
+ false,/* needs_add */
+ state->soa_serial,
+ recs, num_recs);
+ b9_reset_session_info(state);
+ if (!W_ERROR_IS_OK(werr)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
+ ldb_dn_get_linearized(dn), win_errstr(werr));
+ talloc_free(rec);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ state->log(ISC_LOG_INFO, "samba_dlz: subtracted rdataset %s '%s'", name, rdatastr);
+
+ talloc_free(rec);
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ NULL,
+ name,
+ rdatastr);
+ return result;
+}
+
+
+/*
+ delete all records of the given type
+ */
+_PUBLIC_ isc_result_t dlz_delrdataset(const char *name, const char *type, void *dbdata, void *version)
+{
+ struct timeval start = timeval_current();
+ struct dlz_bind9_data *state = talloc_get_type_abort(dbdata, struct dlz_bind9_data);
+ TALLOC_CTX *tmp_ctx;
+ struct ldb_dn *dn;
+ isc_result_t result = ISC_R_SUCCESS;
+ enum dns_record_type dns_type;
+ bool found = false;
+ struct dnsp_DnssrvRpcRecord *recs = NULL;
+ uint16_t num_recs = 0;
+ uint16_t ri = 0;
+ WERROR werr;
+
+ if (state->transaction_token != (void*)version) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: bad transaction version");
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ if (!b9_dns_type(type, &dns_type)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: bad dns type %s in delete", type);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ tmp_ctx = talloc_new(state);
+
+ /* find the DN of the record */
+ result = b9_find_name_dn(state, name, tmp_ctx, &dn);
+ if (result != ISC_R_SUCCESS) {
+ talloc_free(tmp_ctx);
+ goto exit;
+ }
+
+ /* get the existing records */
+ werr = dns_common_lookup(state->samdb, tmp_ctx, dn,
+ &recs, &num_recs, NULL);
+ if (!W_ERROR_IS_OK(werr)) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_NOTFOUND;
+ goto exit;
+ }
+
+ for (ri=0; ri < num_recs; ri++) {
+ if (dns_type != recs[ri].wType) {
+ continue;
+ }
+
+ found = true;
+ recs[ri] = (struct dnsp_DnssrvRpcRecord) {
+ .wType = DNS_TYPE_TOMBSTONE,
+ };
+ }
+
+ if (!found) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ if (!b9_set_session_info(state, name)) {
+ talloc_free(tmp_ctx);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ /* modify the record */
+ werr = dns_common_replace(state->samdb, tmp_ctx, dn,
+ false,/* needs_add */
+ state->soa_serial,
+ recs, num_recs);
+ b9_reset_session_info(state);
+ if (!W_ERROR_IS_OK(werr)) {
+ state->log(ISC_LOG_ERROR, "samba_dlz: failed to modify %s - %s",
+ ldb_dn_get_linearized(dn), win_errstr(werr));
+ talloc_free(tmp_ctx);
+ result = ISC_R_FAILURE;
+ goto exit;
+ }
+
+ state->log(ISC_LOG_INFO, "samba_dlz: deleted rdataset %s of type %s", name, type);
+
+ talloc_free(tmp_ctx);
+exit:
+ DNS_COMMON_LOG_OPERATION(
+ isc_result_str(result),
+ &start,
+ NULL,
+ name,
+ type);
+ return result;
+}