/*
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 .
*/
#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
#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; idata.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 *dns_hostname = NULL;
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
*/
dns_hostname = lpcfg_dns_hostname(state->lp);
if (dns_hostname == NULL) {
return false;
}
mname = talloc_asprintf(mem_ctx, "%s.", dns_hostname);
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; idwTtlSeconds, NULL, "\t", saveptr);
DNS_PARSE_STR(dclass, NULL, "\t", saveptr);
DNS_PARSE_STR(type, NULL, "\t", saveptr);
/* construct the record */
for (i=0; iwType = 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; icount; 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; jcount; 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;
}