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samba-mirror/source4/libnet/libnet_site.c
Volker Lendecke 3987cb0bc3 libnet: Fix Coverity ID 1634803 Dereference after null check
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Thu Nov 14 18:29:46 UTC 2024 on atb-devel-224
2024-11-14 18:29:46 +00:00

286 lines
7.7 KiB
C

/*
Unix SMB/CIFS implementation.
Copyright (C) Brad Henry 2005
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 "libnet/libnet.h"
#include "libcli/cldap/cldap.h"
#include "source3/libads/netlogon_ping.h"
#include <ldb.h>
#include <ldb_errors.h>
#include "libcli/resolve/resolve.h"
#include "param/param.h"
#include "lib/tsocket/tsocket.h"
/**
* 1. Setup a CLDAP socket.
* 2. Lookup the default Site-Name.
*/
NTSTATUS libnet_FindSite(TALLOC_CTX *ctx, struct libnet_context *lctx, struct libnet_JoinSite *r)
{
NTSTATUS status;
TALLOC_CTX *tmp_ctx = NULL;
char *site_name_str = NULL;
char *config_dn_str = NULL;
char *server_dn_str = NULL;
int ret;
struct tsocket_address *dest_address = NULL;
struct netlogon_samlogon_response **responses = NULL;
tmp_ctx = talloc_named(ctx, 0, "libnet_FindSite temp context");
if (!tmp_ctx) {
r->out.error_string = NULL;
goto nomem;
}
site_name_str = talloc_strdup(tmp_ctx, "Default-First-Site-Name");
if (site_name_str == NULL) {
r->out.error_string = NULL;
goto nomem;
}
ret = tsocket_address_inet_from_strings(
tmp_ctx, "ip", r->in.dest_address, 389, &dest_address);
if (ret != 0) {
r->out.error_string = NULL;
status = map_nt_error_from_unix_common(errno);
goto fail;
}
status = netlogon_pings(tmp_ctx, /* mem_ctx */
lpcfg_client_netlogon_ping_protocol(
lctx->lp_ctx), /* proto */
&dest_address, /* servers*/
1, /* num_servers */
(struct netlogon_ping_filter){
.ntversion = NETLOGON_NT_VERSION_5 |
NETLOGON_NT_VERSION_5EX,
.acct_ctrl = -1,
},
1, /* min_servers */
tevent_timeval_current_ofs(2, 0), /* timeout */
&responses);
if (NT_STATUS_IS_OK(status)) {
struct netlogon_samlogon_response *resp = responses[0];
struct NETLOGON_SAM_LOGON_RESPONSE_EX
*nt5ex = &resp->data.nt5_ex;
map_netlogon_samlogon_response(resp);
if ((nt5ex->client_site != NULL) &&
(nt5ex->client_site[0] != '\0'))
{
site_name_str = talloc_strdup(tmp_ctx,
nt5ex->client_site);
if (site_name_str == NULL) {
r->out.error_string = NULL;
goto nomem;
}
}
}
/* Generate the CN=Configuration,... DN. */
/* TODO: look it up! */
config_dn_str = talloc_asprintf(tmp_ctx, "CN=Configuration,%s", r->in.domain_dn_str);
if (!config_dn_str) {
r->out.error_string = NULL;
goto nomem;
}
/* Generate the CN=Servers,... DN. */
server_dn_str = talloc_asprintf(tmp_ctx, "CN=%s,CN=Servers,CN=%s,CN=Sites,%s",
r->in.netbios_name, site_name_str, config_dn_str);
if (!server_dn_str) {
r->out.error_string = NULL;
goto nomem;
}
r->out.site_name_str = talloc_move(r, &site_name_str);
r->out.config_dn_str = talloc_move(r, &config_dn_str);
r->out.server_dn_str = talloc_move(r, &server_dn_str);
talloc_free(tmp_ctx);
return NT_STATUS_OK;
nomem:
status = NT_STATUS_NO_MEMORY;
fail:
TALLOC_FREE(tmp_ctx);
return status;
}
/*
* find out Site specific stuff:
* 1. Lookup the Site name.
* 2. Add entry CN=<netbios name>,CN=Servers,CN=<site name>,CN=Sites,CN=Configuration,<domain dn>.
* TODO: 3.) use DsAddEntry() to create CN=NTDS Settings,CN=<netbios name>,CN=Servers,CN=<site name>,...
*/
NTSTATUS libnet_JoinSite(struct libnet_context *ctx,
struct ldb_context *remote_ldb,
struct libnet_JoinDomain *libnet_r)
{
NTSTATUS status;
TALLOC_CTX *tmp_ctx;
struct libnet_JoinSite *r;
struct ldb_dn *server_dn;
struct ldb_message *msg;
int rtn;
const char *server_dn_str;
const char *host;
struct nbt_name name;
const char *dest_addr = NULL;
tmp_ctx = talloc_named(libnet_r, 0, "libnet_JoinSite temp context");
if (!tmp_ctx) {
libnet_r->out.error_string = NULL;
return NT_STATUS_NO_MEMORY;
}
r = talloc(tmp_ctx, struct libnet_JoinSite);
if (!r) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
host = dcerpc_binding_get_string_option(libnet_r->out.samr_binding, "host");
make_nbt_name_client(&name, host);
status = resolve_name_ex(lpcfg_resolve_context(ctx->lp_ctx),
0, 0,
&name, r, &dest_addr, ctx->event_ctx);
if (!NT_STATUS_IS_OK(status)) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return status;
}
/* Resolve the site name and AD DN's. */
r->in.dest_address = dest_addr;
r->in.netbios_name = libnet_r->in.netbios_name;
r->in.domain_dn_str = libnet_r->out.domain_dn_str;
status = libnet_FindSite(tmp_ctx, ctx, r);
if (!NT_STATUS_IS_OK(status)) {
libnet_r->out.error_string =
talloc_steal(libnet_r, r->out.error_string);
talloc_free(tmp_ctx);
return status;
}
server_dn_str = r->out.server_dn_str;
/*
Add entry CN=<netbios name>,CN=Servers,CN=<site name>,CN=Sites,CN=Configuration,<domain dn>.
*/
msg = ldb_msg_new(tmp_ctx);
if (!msg) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
rtn = ldb_msg_add_string(msg, "objectClass", "server");
if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
rtn = ldb_msg_add_string(msg, "systemFlags", "50000000");
if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
rtn = ldb_msg_add_string(msg, "serverReference", libnet_r->out.account_dn_str);
if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
server_dn = ldb_dn_new(tmp_ctx, remote_ldb, server_dn_str);
if ( ! ldb_dn_validate(server_dn)) {
libnet_r->out.error_string = talloc_asprintf(libnet_r,
"Invalid server dn: %s",
server_dn_str);
talloc_free(tmp_ctx);
return NT_STATUS_UNSUCCESSFUL;
}
msg->dn = server_dn;
rtn = ldb_add(remote_ldb, msg);
if (rtn == LDB_ERR_ENTRY_ALREADY_EXISTS) {
unsigned int i;
/* make a 'modify' msg, and only for serverReference */
msg = ldb_msg_new(tmp_ctx);
if (!msg) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
msg->dn = server_dn;
rtn = ldb_msg_add_string(msg, "serverReference",libnet_r->out.account_dn_str);
if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string = NULL;
talloc_free(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* mark all the message elements (should be just one)
as LDB_FLAG_MOD_REPLACE */
for (i=0;i<msg->num_elements;i++) {
msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
}
rtn = ldb_modify(remote_ldb, msg);
if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string
= talloc_asprintf(libnet_r,
"Failed to modify server entry %s: %s: %d",
server_dn_str,
ldb_errstring(remote_ldb), rtn);
talloc_free(tmp_ctx);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
} else if (rtn != LDB_SUCCESS) {
libnet_r->out.error_string
= talloc_asprintf(libnet_r,
"Failed to add server entry %s: %s: %d",
server_dn_str, ldb_errstring(remote_ldb),
rtn);
talloc_free(tmp_ctx);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
DEBUG(0, ("We still need to perform a DsAddEntry() so that we can create the CN=NTDS Settings container.\n"));
/* Store the server DN in libnet_r */
libnet_r->out.server_dn_str = server_dn_str;
talloc_steal(libnet_r, server_dn_str);
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}