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-rw-r--r--source4/dns_server/dns_server.c176
-rw-r--r--source4/dns_server/dns_server.h1
2 files changed, 156 insertions, 21 deletions
diff --git a/source4/dns_server/dns_server.c b/source4/dns_server/dns_server.c
index cc43108bfa..5a6673c267 100644
--- a/source4/dns_server/dns_server.c
+++ b/source4/dns_server/dns_server.c
@@ -36,6 +36,10 @@
#include "param/param.h"
#include "librpc/ndr/libndr.h"
#include "librpc/gen_ndr/ndr_dns.h"
+#include "librpc/gen_ndr/ndr_dnsp.h"
+#include <ldb.h>
+#include "dsdb/samdb/samdb.h"
+#include "auth/session.h"
/* hold information about one dns socket */
struct dns_socket {
@@ -85,37 +89,154 @@ static void dns_tcp_send(struct stream_connection *conn, uint16_t flags)
dns_tcp_terminate_connection(dnsconn, "dns_tcp_send: called");
}
-static NTSTATUS handle_question(TALLOC_CTX *mem_ctx,
- struct dns_name_question *question,
+static NTSTATUS dns_name2dn(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const char *name,
+ struct ldb_dn **_dn)
+{
+ struct ldb_dn *base;
+ struct ldb_dn *dn;
+ const char *p;
+
+ if (name == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /*TODO: Check if 'name' is a valid DNS name */
+
+ if (strcmp(name, "") == 0) {
+ base = ldb_get_default_basedn(dns->samdb);
+ dn = ldb_dn_copy(mem_ctx, base);
+ ldb_dn_add_child_fmt(dn, "DC=@,DC=RootDNSServers,CN=MicrosoftDNS,CN=System");
+ *_dn = dn;
+ return NT_STATUS_OK;
+ }
+
+ p = strcasestr(name, "root-servers.net");
+ if (p != NULL) {
+ base = ldb_get_default_basedn(dns->samdb);
+ dn = ldb_dn_copy(mem_ctx, base);
+ ldb_dn_add_child_fmt(dn, "DC=%s,DC=RootDNSServers,CN=MicrosoftDNS,CN=System", name);
+ *_dn = dn;
+ return NT_STATUS_OK;
+ }
+
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+}
+
+static NTSTATUS handle_question(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const struct dns_name_question *question,
struct dns_res_rec **answers, uint16_t *ancount)
{
struct dns_res_rec *ans;
- uint16_t count = *ancount;
- count += 1;
- ans = talloc_realloc(NULL, *answers, struct dns_res_rec, count);
+ struct ldb_dn *dn = NULL;
+ NTSTATUS status;
+ static const char * const attrs[] = { "dnsRecord", NULL};
+ int ret;
+ uint16_t ai = *ancount;
+ uint16_t ri;
+ struct ldb_message *msg = NULL;
+ struct dnsp_DnssrvRpcRecord *recs;
+ struct ldb_message_element *el;
+
+ status = dns_name2dn(dns, mem_ctx, question->name, &dn);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ ret = dsdb_search_one(dns->samdb, mem_ctx, &msg, dn,
+ LDB_SCOPE_BASE, attrs, 0, "%s", "(objectClass=dnsNode)");
+ if (ret != LDB_SUCCESS) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ el = ldb_msg_find_element(msg, attrs[0]);
+ if (el == NULL) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ recs = talloc_array(mem_ctx, struct dnsp_DnssrvRpcRecord, el->num_values);
+ for (ri = 0; ri < el->num_values; ri++) {
+ struct ldb_val *v = &el->values[ri];
+ enum ndr_err_code ndr_err;
+
+ ndr_err = ndr_pull_struct_blob(v, recs, &recs[ri],
+ (ndr_pull_flags_fn_t)ndr_pull_dnsp_DnssrvRpcRecord);
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(0, ("Failed to grab dnsp_DnssrvRpcRecord\n"));
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+ }
+
+ ans = talloc_realloc(mem_ctx, *answers, struct dns_res_rec,
+ ai + el->num_values);
NT_STATUS_HAVE_NO_MEMORY(ans);
- ans[0].name = talloc_strdup(ans, "example.com");
- ans[0].rr_type = DNS_QTYPE_A;
- ans[0].rr_class = DNS_QCLASS_IP;
- ans[0].ttl = 0;
- ans[0].rdata.ipv4_record = talloc_strdup(ans, "127.0.0.1");
+ switch (question->question_type) {
+ case DNS_QTYPE_A:
+ for (ri = 0; ri < el->num_values; ri++) {
+ if (recs[ri].wType != question->question_type) {
+ continue;
+ }
+
+ ZERO_STRUCT(ans[ai]);
+ ans[ai].name = talloc_strdup(ans, question->name);
+ ans[ai].rr_type = DNS_QTYPE_A;
+ ans[ai].rr_class = DNS_QCLASS_IP;
+ ans[ai].ttl = recs[ri].dwTtlSeconds;
+ ans[ai].rdata.ipv4_record = talloc_strdup(ans, recs[ri].data.ipv4);
+ ai++;
+ }
+ break;
+ case DNS_QTYPE_AAAA:
+ for (ri = 0; ri < el->num_values; ri++) {
+ if (recs[ri].wType != question->question_type) {
+ continue;
+ }
+
+ ZERO_STRUCT(ans[ai]);
+ ans[ai].name = talloc_strdup(ans, question->name);
+ ans[ai].rr_type = DNS_QTYPE_AAAA;
+ ans[ai].rr_class = DNS_QCLASS_IP;
+ ans[ai].ttl = recs[ri].dwTtlSeconds;
+ ans[ai].rdata.ipv6_record = recs[ri].data.ipv6;
+ ai++;
+ }
+ break;
+ case DNS_QTYPE_NS:
+ for (ri = 0; ri < el->num_values; ri++) {
+ if (recs[ri].wType != question->question_type) {
+ continue;
+ }
+
+ ZERO_STRUCT(ans[ai]);
+ ans[ai].name = question->name;
+ ans[ai].rr_type = DNS_QTYPE_NS;
+ ans[ai].rr_class = DNS_QCLASS_IP;
+ ans[ai].ttl = recs[ri].dwTtlSeconds;
+ ans[ai].rdata.ns_record = recs[ri].data.ns;
+ ai++;
+ }
+ break;
+ default:
+ return NT_STATUS_NOT_IMPLEMENTED;
+ }
- *ancount = count;
+ *ancount = ai;
*answers = ans;
return NT_STATUS_OK;
}
-static NTSTATUS compute_reply(TALLOC_CTX *mem_ctx,
+static NTSTATUS compute_reply(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
struct dns_name_packet *in,
struct dns_res_rec **answers, uint16_t *ancount,
struct dns_res_rec **nsrecs, uint16_t *nscount,
struct dns_res_rec **additional, uint16_t *arcount)
{
- uint16_t num_answers=0, num_nsrecs=0, num_additional=0;
- struct dns_res_rec *ans=NULL, *ns=NULL, *add=NULL;
+ uint16_t num_answers=0;
+ struct dns_res_rec *ans=NULL;
int i;
NTSTATUS status;
@@ -123,7 +244,7 @@ static NTSTATUS compute_reply(TALLOC_CTX *mem_ctx,
if (answers == NULL) return NT_STATUS_NO_MEMORY;
for (i = 0; i < in->qdcount; ++i) {
- status = handle_question(mem_ctx, &in->questions[i], &ans, &num_answers);
+ status = handle_question(dns, mem_ctx, &in->questions[i], &ans, &num_answers);
NT_STATUS_NOT_OK_RETURN(status);
}
@@ -147,14 +268,14 @@ static NTSTATUS dns_process(struct dns_server *dns,
{
enum ndr_err_code ndr_err;
NTSTATUS ret;
- struct dns_name_packet *in_packet = talloc(mem_ctx, struct dns_name_packet);
- struct dns_name_packet *out_packet = talloc(mem_ctx, struct dns_name_packet);
+ struct dns_name_packet *in_packet = talloc_zero(mem_ctx, struct dns_name_packet);
+ struct dns_name_packet *out_packet = talloc_zero(mem_ctx, struct dns_name_packet);
struct dns_res_rec *answers, *nsrecs, *additional;
uint16_t num_answers, num_nsrecs, num_additional;
if (in_packet == NULL) return NT_STATUS_INVALID_PARAMETER;
- dump_data(0, in->data, in->length);
+ dump_data(2, in->data, in->length);
ndr_err = ndr_pull_struct_blob(in, in_packet, in_packet,
(ndr_pull_flags_fn_t)ndr_pull_dns_name_packet);
@@ -166,8 +287,8 @@ static NTSTATUS dns_process(struct dns_server *dns,
NDR_PRINT_DEBUG(dns_name_packet, in_packet);
out_packet->id = in_packet->id;
- out_packet->operation = DNS_FLAG_REPLY | DNS_FLAG_AUTHORITATIVE;
- /* TODO: DNS_FLAG_RECURSION_DESIRED | DNS_FLAG_RECURSION_AVAIL; */
+ out_packet->operation = DNS_FLAG_REPLY | DNS_FLAG_AUTHORITATIVE |
+ DNS_FLAG_RECURSION_DESIRED | DNS_FLAG_RECURSION_AVAIL;
out_packet->qdcount = in_packet->qdcount;
out_packet->questions = in_packet->questions;
@@ -181,7 +302,7 @@ static NTSTATUS dns_process(struct dns_server *dns,
out_packet->arcount = 0;
out_packet->additional = NULL;
- ret = compute_reply(out_packet, in_packet, &answers, &num_answers,
+ ret = compute_reply(dns, out_packet, in_packet, &answers, &num_answers,
&nsrecs, &num_nsrecs, &additional, &num_additional);
if (NT_STATUS_IS_OK(ret)) {
@@ -195,6 +316,7 @@ static NTSTATUS dns_process(struct dns_server *dns,
out_packet->additional = additional;
}
+ NDR_PRINT_DEBUG(dns_name_packet, out_packet);
ndr_err = ndr_push_struct_blob(out, out_packet, out_packet,
(ndr_push_flags_fn_t)ndr_push_dns_name_packet);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
@@ -204,6 +326,7 @@ static NTSTATUS dns_process(struct dns_server *dns,
return NT_STATUS_INTERNAL_ERROR;
}
+ dump_data(2, out->data, out->length);
return NT_STATUS_OK;
}
@@ -261,6 +384,7 @@ static void dns_tcp_call_loop(struct tevent_req *subreq)
/* Call dns */
status = dns_process(dns_conn->dns_socket->dns, call, &call->in, &call->out);
if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
dns_tcp_terminate_connection(dns_conn,
"dns_tcp_call_loop: process function failed");
return;
@@ -441,6 +565,7 @@ static void dns_udp_call_loop(struct tevent_req *subreq)
status = dns_process(sock->dns_socket->dns, call, &call->in, &call->out);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(call);
+ DEBUG(0, ("dns_process returned %s\n", nt_errstr(status)));
goto done;
}
@@ -624,6 +749,15 @@ static void dns_task_init(struct task_server *task)
dns->task = task;
+ /* Connect to a SAMDB with system privileges for fetching the old pw
+ * hashes. */
+ dns->samdb = samdb_connect(dns, dns->task->event_ctx, dns->task->lp_ctx,
+ system_session(dns->task->lp_ctx), 0);
+ if (!dns->samdb) {
+ task_server_terminate(task, "dns: samdb_connect failed", true);
+ return;
+ }
+
status = dns_startup_interfaces(dns, task->lp_ctx, ifaces);
if (!NT_STATUS_IS_OK(status)) {
task_server_terminate(task, "dns failed to setup interfaces", true);
diff --git a/source4/dns_server/dns_server.h b/source4/dns_server/dns_server.h
index ca12c5cd8e..8d7880702f 100644
--- a/source4/dns_server/dns_server.h
+++ b/source4/dns_server/dns_server.h
@@ -28,6 +28,7 @@ struct tsocket_address;
struct dns_server {
struct task_server *task;
+ struct ldb_context *samdb;
};
#endif /* __DNS_SERVER_H__ */
generated by cgit (git 2.34.1) at 2024-12-27 13:18:39 +0000