mirror of
https://github.com/samba-team/samba.git
synced 2024-12-24 21:34:56 +03:00
71c63e85e7
We should treat most gensec related structures private. It's a long way, but this is a start. Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
458 lines
12 KiB
C
458 lines
12 KiB
C
/*
|
|
Unix SMB/CIFS mplementation.
|
|
|
|
LDAP bind calls
|
|
|
|
Copyright (C) Andrew Tridgell 2005
|
|
Copyright (C) Volker Lendecke 2004
|
|
|
|
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 "libcli/ldap/libcli_ldap.h"
|
|
#include "libcli/ldap/ldap_proto.h"
|
|
#include "libcli/ldap/ldap_client.h"
|
|
#include "lib/tls/tls.h"
|
|
#include "auth/gensec/gensec.h"
|
|
#include "auth/gensec/gensec_internal.h" /* TODO: remove this */
|
|
#include "auth/gensec/gensec_socket.h"
|
|
#include "auth/credentials/credentials.h"
|
|
#include "lib/stream/packet.h"
|
|
#include "param/param.h"
|
|
|
|
struct ldap_simple_creds {
|
|
const char *dn;
|
|
const char *pw;
|
|
};
|
|
|
|
_PUBLIC_ NTSTATUS ldap_rebind(struct ldap_connection *conn)
|
|
{
|
|
NTSTATUS status;
|
|
struct ldap_simple_creds *creds;
|
|
|
|
switch (conn->bind.type) {
|
|
case LDAP_BIND_SASL:
|
|
status = ldap_bind_sasl(conn, (struct cli_credentials *)conn->bind.creds,
|
|
conn->lp_ctx);
|
|
break;
|
|
|
|
case LDAP_BIND_SIMPLE:
|
|
creds = (struct ldap_simple_creds *)conn->bind.creds;
|
|
|
|
if (creds == NULL) {
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
status = ldap_bind_simple(conn, creds->dn, creds->pw);
|
|
break;
|
|
|
|
default:
|
|
return NT_STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
static struct ldap_message *new_ldap_simple_bind_msg(struct ldap_connection *conn,
|
|
const char *dn, const char *pw)
|
|
{
|
|
struct ldap_message *res;
|
|
|
|
res = new_ldap_message(conn);
|
|
if (!res) {
|
|
return NULL;
|
|
}
|
|
|
|
res->type = LDAP_TAG_BindRequest;
|
|
res->r.BindRequest.version = 3;
|
|
res->r.BindRequest.dn = talloc_strdup(res, dn);
|
|
res->r.BindRequest.mechanism = LDAP_AUTH_MECH_SIMPLE;
|
|
res->r.BindRequest.creds.password = talloc_strdup(res, pw);
|
|
res->controls = NULL;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
perform a simple username/password bind
|
|
*/
|
|
_PUBLIC_ NTSTATUS ldap_bind_simple(struct ldap_connection *conn,
|
|
const char *userdn, const char *password)
|
|
{
|
|
struct ldap_request *req;
|
|
struct ldap_message *msg;
|
|
const char *dn, *pw;
|
|
NTSTATUS status;
|
|
|
|
if (conn == NULL) {
|
|
return NT_STATUS_INVALID_CONNECTION;
|
|
}
|
|
|
|
if (userdn) {
|
|
dn = userdn;
|
|
} else {
|
|
if (conn->auth_dn) {
|
|
dn = conn->auth_dn;
|
|
} else {
|
|
dn = "";
|
|
}
|
|
}
|
|
|
|
if (password) {
|
|
pw = password;
|
|
} else {
|
|
if (conn->simple_pw) {
|
|
pw = conn->simple_pw;
|
|
} else {
|
|
pw = "";
|
|
}
|
|
}
|
|
|
|
msg = new_ldap_simple_bind_msg(conn, dn, pw);
|
|
NT_STATUS_HAVE_NO_MEMORY(msg);
|
|
|
|
/* send the request */
|
|
req = ldap_request_send(conn, msg);
|
|
talloc_free(msg);
|
|
NT_STATUS_HAVE_NO_MEMORY(req);
|
|
|
|
/* wait for replies */
|
|
status = ldap_request_wait(req);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
talloc_free(req);
|
|
return status;
|
|
}
|
|
|
|
/* check its a valid reply */
|
|
msg = req->replies[0];
|
|
if (msg->type != LDAP_TAG_BindResponse) {
|
|
talloc_free(req);
|
|
return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
|
|
}
|
|
|
|
status = ldap_check_response(conn, &msg->r.BindResponse.response);
|
|
|
|
talloc_free(req);
|
|
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
struct ldap_simple_creds *creds = talloc(conn, struct ldap_simple_creds);
|
|
if (creds == NULL) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
creds->dn = talloc_strdup(creds, dn);
|
|
creds->pw = talloc_strdup(creds, pw);
|
|
if (creds->dn == NULL || creds->pw == NULL) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
conn->bind.type = LDAP_BIND_SIMPLE;
|
|
conn->bind.creds = creds;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
static struct ldap_message *new_ldap_sasl_bind_msg(struct ldap_connection *conn,
|
|
const char *sasl_mechanism,
|
|
DATA_BLOB *secblob)
|
|
{
|
|
struct ldap_message *res;
|
|
|
|
res = new_ldap_message(conn);
|
|
if (!res) {
|
|
return NULL;
|
|
}
|
|
|
|
res->type = LDAP_TAG_BindRequest;
|
|
res->r.BindRequest.version = 3;
|
|
res->r.BindRequest.dn = "";
|
|
res->r.BindRequest.mechanism = LDAP_AUTH_MECH_SASL;
|
|
res->r.BindRequest.creds.SASL.mechanism = talloc_strdup(res, sasl_mechanism);
|
|
if (secblob) {
|
|
res->r.BindRequest.creds.SASL.secblob = talloc(res, DATA_BLOB);
|
|
if (!res->r.BindRequest.creds.SASL.secblob) {
|
|
talloc_free(res);
|
|
return NULL;
|
|
}
|
|
*res->r.BindRequest.creds.SASL.secblob = *secblob;
|
|
} else {
|
|
res->r.BindRequest.creds.SASL.secblob = NULL;
|
|
}
|
|
res->controls = NULL;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
perform a sasl bind using the given credentials
|
|
*/
|
|
_PUBLIC_ NTSTATUS ldap_bind_sasl(struct ldap_connection *conn,
|
|
struct cli_credentials *creds,
|
|
struct loadparm_context *lp_ctx)
|
|
{
|
|
NTSTATUS status;
|
|
TALLOC_CTX *tmp_ctx = NULL;
|
|
|
|
DATA_BLOB input = data_blob(NULL, 0);
|
|
DATA_BLOB output = data_blob(NULL, 0);
|
|
|
|
struct ldap_message **sasl_mechs_msgs;
|
|
struct ldap_SearchResEntry *search;
|
|
int count, i;
|
|
|
|
const char **sasl_names;
|
|
uint32_t old_gensec_features;
|
|
static const char *supported_sasl_mech_attrs[] = {
|
|
"supportedSASLMechanisms",
|
|
NULL
|
|
};
|
|
unsigned int logon_retries = 0;
|
|
|
|
status = ildap_search(conn, "", LDAP_SEARCH_SCOPE_BASE, "", supported_sasl_mech_attrs,
|
|
false, NULL, NULL, &sasl_mechs_msgs);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("Failed to inquire of target's available sasl mechs in rootdse search: %s\n",
|
|
nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
|
|
count = ildap_count_entries(conn, sasl_mechs_msgs);
|
|
if (count != 1) {
|
|
DEBUG(1, ("Failed to inquire of target's available sasl mechs in rootdse search: wrong number of replies: %d\n",
|
|
count));
|
|
goto failed;
|
|
}
|
|
|
|
tmp_ctx = talloc_new(conn);
|
|
if (tmp_ctx == NULL) goto failed;
|
|
|
|
search = &sasl_mechs_msgs[0]->r.SearchResultEntry;
|
|
if (search->num_attributes != 1) {
|
|
DEBUG(1, ("Failed to inquire of target's available sasl mechs in rootdse search: wrong number of attributes: %d != 1\n",
|
|
search->num_attributes));
|
|
goto failed;
|
|
}
|
|
|
|
sasl_names = talloc_array(tmp_ctx, const char *, search->attributes[0].num_values + 1);
|
|
if (!sasl_names) {
|
|
DEBUG(1, ("talloc_arry(char *, %d) failed\n",
|
|
count));
|
|
goto failed;
|
|
}
|
|
|
|
for (i=0; i<search->attributes[0].num_values; i++) {
|
|
sasl_names[i] = (const char *)search->attributes[0].values[i].data;
|
|
}
|
|
sasl_names[i] = NULL;
|
|
|
|
gensec_init();
|
|
|
|
try_logon_again:
|
|
/*
|
|
we loop back here on a logon failure, and re-create the
|
|
gensec session. The logon_retries counter ensures we don't
|
|
loop forever.
|
|
*/
|
|
|
|
status = gensec_client_start(conn, &conn->gensec,
|
|
lpcfg_gensec_settings(conn, lp_ctx));
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(0, ("Failed to start GENSEC engine (%s)\n", nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
|
|
/* require Kerberos SIGN/SEAL only if we don't use SSL
|
|
* Windows seem not to like double encryption */
|
|
old_gensec_features = cli_credentials_get_gensec_features(creds);
|
|
if (tls_enabled(conn->sock)) {
|
|
cli_credentials_set_gensec_features(creds, old_gensec_features & ~(GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL));
|
|
}
|
|
|
|
/* this call also sets the gensec_want_features */
|
|
status = gensec_set_credentials(conn->gensec, creds);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("Failed to set GENSEC creds: %s\n",
|
|
nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
|
|
/* reset the original gensec_features (on the credentials
|
|
* context, so we don't tatoo it ) */
|
|
cli_credentials_set_gensec_features(creds, old_gensec_features);
|
|
|
|
if (conn->host) {
|
|
status = gensec_set_target_hostname(conn->gensec, conn->host);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("Failed to set GENSEC target hostname: %s\n",
|
|
nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
status = gensec_set_target_service(conn->gensec, "ldap");
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("Failed to set GENSEC target service: %s\n",
|
|
nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
|
|
status = gensec_start_mech_by_sasl_list(conn->gensec, sasl_names);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DEBUG(1, ("None of the %d proposed SASL mechs were acceptable: %s\n",
|
|
count, nt_errstr(status)));
|
|
goto failed;
|
|
}
|
|
|
|
while (1) {
|
|
NTSTATUS gensec_status;
|
|
struct ldap_message *response;
|
|
struct ldap_message *msg;
|
|
struct ldap_request *req;
|
|
int result = LDAP_OTHER;
|
|
|
|
status = gensec_update(conn->gensec, tmp_ctx,
|
|
conn->event.event_ctx,
|
|
input,
|
|
&output);
|
|
/* The status value here, from GENSEC is vital to the security
|
|
* of the system. Even if the other end accepts, if GENSEC
|
|
* claims 'MORE_PROCESSING_REQUIRED' then you must keep
|
|
* feeding it blobs, or else the remote host/attacker might
|
|
* avoid mutal authentication requirements.
|
|
*
|
|
* Likewise, you must not feed GENSEC too much (after the OK),
|
|
* it doesn't like that either
|
|
*/
|
|
|
|
gensec_status = status;
|
|
|
|
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
|
|
!NT_STATUS_IS_OK(status)) {
|
|
break;
|
|
}
|
|
if (NT_STATUS_IS_OK(status) && output.length == 0) {
|
|
break;
|
|
}
|
|
|
|
/* Perhaps we should make gensec_start_mech_by_sasl_list() return the name we got? */
|
|
msg = new_ldap_sasl_bind_msg(tmp_ctx, conn->gensec->ops->sasl_name, (output.data?&output:NULL));
|
|
if (msg == NULL) {
|
|
status = NT_STATUS_NO_MEMORY;
|
|
goto failed;
|
|
}
|
|
|
|
req = ldap_request_send(conn, msg);
|
|
if (req == NULL) {
|
|
status = NT_STATUS_NO_MEMORY;
|
|
goto failed;
|
|
}
|
|
talloc_reparent(conn, tmp_ctx, req);
|
|
|
|
status = ldap_result_n(req, 0, &response);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto failed;
|
|
}
|
|
|
|
if (response->type != LDAP_TAG_BindResponse) {
|
|
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
|
|
goto failed;
|
|
}
|
|
|
|
result = response->r.BindResponse.response.resultcode;
|
|
|
|
if (result == LDAP_INVALID_CREDENTIALS) {
|
|
/*
|
|
try a second time on invalid credentials, to
|
|
give the user a chance to re-enter the
|
|
password and to handle the case where our
|
|
kerberos ticket is invalid as the server
|
|
password has changed
|
|
*/
|
|
const char *principal;
|
|
|
|
principal = gensec_get_target_principal(conn->gensec);
|
|
if (principal == NULL) {
|
|
const char *hostname = gensec_get_target_hostname(conn->gensec);
|
|
const char *service = gensec_get_target_service(conn->gensec);
|
|
if (hostname != NULL && service != NULL) {
|
|
principal = talloc_asprintf(tmp_ctx, "%s/%s", service, hostname);
|
|
}
|
|
}
|
|
|
|
if (cli_credentials_failed_kerberos_login(creds, principal, &logon_retries) ||
|
|
cli_credentials_wrong_password(creds)) {
|
|
/*
|
|
destroy our gensec session and loop
|
|
back up to the top to retry,
|
|
offering the user a chance to enter
|
|
new credentials, or get a new ticket
|
|
if using kerberos
|
|
*/
|
|
talloc_free(conn->gensec);
|
|
conn->gensec = NULL;
|
|
goto try_logon_again;
|
|
}
|
|
}
|
|
|
|
if (result != LDAP_SUCCESS && result != LDAP_SASL_BIND_IN_PROGRESS) {
|
|
status = ldap_check_response(conn,
|
|
&response->r.BindResponse.response);
|
|
break;
|
|
}
|
|
|
|
/* This is where we check if GENSEC wanted to be fed more data */
|
|
if (!NT_STATUS_EQUAL(gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
|
|
break;
|
|
}
|
|
if (response->r.BindResponse.SASL.secblob) {
|
|
input = *response->r.BindResponse.SASL.secblob;
|
|
} else {
|
|
input = data_blob(NULL, 0);
|
|
}
|
|
}
|
|
|
|
talloc_free(tmp_ctx);
|
|
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
struct socket_context *sasl_socket;
|
|
status = gensec_socket_init(conn->gensec,
|
|
conn,
|
|
conn->sock,
|
|
conn->event.event_ctx,
|
|
ldap_read_io_handler,
|
|
conn,
|
|
&sasl_socket);
|
|
if (!NT_STATUS_IS_OK(status)) goto failed;
|
|
|
|
conn->sock = sasl_socket;
|
|
packet_set_socket(conn->packet, conn->sock);
|
|
|
|
conn->bind.type = LDAP_BIND_SASL;
|
|
conn->bind.creds = creds;
|
|
}
|
|
|
|
return status;
|
|
|
|
failed:
|
|
talloc_free(tmp_ctx);
|
|
talloc_free(conn->gensec);
|
|
conn->gensec = NULL;
|
|
return status;
|
|
}
|