Unix SMB/CIFS implementation.
SMB Transport encryption (sealing) code - server code.
Copyright (C) Jeremy Allison 2007.
-
+
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 2 of the License, or
+ 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "../libcli/auth/spnego.h"
+#include "../auth/ntlmssp/ntlmssp.h"
+#include "ntlmssp_wrap.h"
+#include "smb_crypt.h"
+#include "../lib/util/asn1.h"
+#include "auth.h"
+#include "libsmb/libsmb.h"
+#include "../lib/tsocket/tsocket.h"
+#include "auth/gensec/gensec.h"
/******************************************************************************
Server side encryption.
struct smb_srv_trans_enc_ctx {
struct smb_trans_enc_state *es;
- AUTH_NTLMSSP_STATE *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
+ struct gensec_security *gensec_security; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
};
-static struct smb_srv_trans_enc_ctx *partial_srv_trans_enc_ctx;
-static struct smb_srv_trans_enc_ctx *srv_trans_enc_ctx;
+/******************************************************************************
+ Return global enc context - this must change if we ever do multiple contexts.
+******************************************************************************/
+
+static uint16_t srv_enc_ctx(const struct smb_srv_trans_enc_ctx *ec)
+{
+ return ec->es->enc_ctx_num;
+}
/******************************************************************************
- Is server encryption on ?
+ Is this an incoming encrypted packet ?
******************************************************************************/
-BOOL srv_encryption_on(void)
+bool is_encrypted_packet(struct smbd_server_connection *sconn,
+ const uint8_t *inbuf)
{
- if (srv_trans_enc_ctx) {
- return common_encryption_on(srv_trans_enc_ctx->es);
+ NTSTATUS status;
+ uint16_t enc_num;
+
+ /* Ignore non-session messages or non 0xFF'E' messages. */
+ if(CVAL(inbuf,0)
+ || (smb_len(inbuf) < 8)
+ || !(inbuf[4] == 0xFF && inbuf[5] == 'E')) {
+ return false;
+ }
+
+ status = get_enc_ctx_num(inbuf, &enc_num);
+ if (!NT_STATUS_IS_OK(status)) {
+ return false;
+ }
+
+ /* Encrypted messages are 0xFF'E'<ctx> */
+ if (srv_trans_enc_ctx && enc_num == srv_enc_ctx(srv_trans_enc_ctx)) {
+ return true;
}
- return False;
+ return false;
}
/******************************************************************************
Create an auth_ntlmssp_state and ensure pointer copy is correct.
******************************************************************************/
-static NTSTATUS make_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
+static NTSTATUS make_auth_ntlmssp(const struct tsocket_address *remote_address,
+ struct smb_srv_trans_enc_ctx *ec)
{
- NTSTATUS status = auth_ntlmssp_start(&ec->auth_ntlmssp_state);
+ struct auth_ntlmssp_state *auth_ntlmssp_state;
+ NTSTATUS status = auth_ntlmssp_prepare(remote_address,
+ &auth_ntlmssp_state);
+ if (!NT_STATUS_IS_OK(status)) {
+ return nt_status_squash(status);
+ }
+
+ gensec_want_feature(auth_ntlmssp_state->gensec_security, GENSEC_FEATURE_SEAL);
+
+ status = auth_ntlmssp_start(auth_ntlmssp_state);
+
if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(auth_ntlmssp_state);
return nt_status_squash(status);
}
* We must remember to update the pointer copy for the common
* functions after any auth_ntlmssp_start/auth_ntlmssp_end.
*/
- ec->es->s.ntlmssp_state = ec->auth_ntlmssp_state->ntlmssp_state;
+ ec->es->s.gensec_security = ec->gensec_security;
+
+ /* We do not need the auth_ntlmssp layer any more, which was
+ * allocated on NULL, so promote gensec_security to the NULL
+ * context */
+ ec->gensec_security = talloc_move(NULL, &auth_ntlmssp_state->gensec_security);
+ TALLOC_FREE(auth_ntlmssp_state);
+
return status;
}
* functions after any auth_ntlmssp_start/auth_ntlmssp_end.
*/
- if (ec->auth_ntlmssp_state) {
- auth_ntlmssp_end(&ec->auth_ntlmssp_state);
+ if (ec->gensec_security) {
+ TALLOC_FREE(ec->gensec_security);
/* The auth_ntlmssp_end killed this already. */
- ec->es->s.ntlmssp_state = NULL;
+ ec->es->s.gensec_security = NULL;
}
}
NTSTATUS status = NT_STATUS_OK;
gss_OID_desc nt_hostbased_service =
- {10, CONST_DISCARD(char *,"\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
+ {10, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
- asprintf(&host_princ_s, "%s@%s", service, name);
- if (host_princ_s == NULL) {
+ if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
return NT_STATUS_NO_MEMORY;
}
gss_cred_id_t srv_cred;
fstring fqdn;
- name_to_fqdn(fqdn, global_myname());
+ name_to_fqdn(fqdn, lp_netbios_name());
strlower_m(fqdn);
status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
Create a server encryption context.
******************************************************************************/
-static NTSTATUS make_srv_encryption_context(enum smb_trans_enc_type smb_enc_type, struct smb_srv_trans_enc_ctx **pp_ec)
+static NTSTATUS make_srv_encryption_context(const struct tsocket_address *remote_address,
+ enum smb_trans_enc_type smb_enc_type,
+ struct smb_srv_trans_enc_ctx **pp_ec)
{
struct smb_srv_trans_enc_ctx *ec;
switch (smb_enc_type) {
case SMB_TRANS_ENC_NTLM:
{
- NTSTATUS status = make_auth_ntlmssp(ec);
+ NTSTATUS status = make_auth_ntlmssp(remote_address,
+ ec);
if (!NT_STATUS_IS_OK(status)) {
srv_free_encryption_context(&ec);
return status;
Free an encryption-allocated buffer.
******************************************************************************/
-void srv_free_enc_buffer(char *buf)
+void srv_free_enc_buffer(struct smbd_server_connection *sconn, char *buf)
{
/* We know this is an smb buffer, and we
* didn't malloc, only copy, for a keepalive,
- * so ignore session keepalives. */
+ * so ignore non-session messages. */
- if(CVAL(buf,0) == SMBkeepalive) {
+ if(CVAL(buf,0)) {
return;
}
Decrypt an incoming buffer.
******************************************************************************/
-NTSTATUS srv_decrypt_buffer(char *buf)
+NTSTATUS srv_decrypt_buffer(struct smbd_server_connection *sconn, char *buf)
{
- /* Ignore session keepalives. */
- if(CVAL(buf,0) == SMBkeepalive) {
+ /* Ignore non-session messages. */
+ if(CVAL(buf,0)) {
return NT_STATUS_OK;
}
Encrypt an outgoing buffer. Return the encrypted pointer in buf_out.
******************************************************************************/
-NTSTATUS srv_encrypt_buffer(char *buf, char **buf_out)
+NTSTATUS srv_encrypt_buffer(struct smbd_server_connection *sconn, char *buf,
+ char **buf_out)
{
*buf_out = buf;
- /* Ignore session keepalives. */
- if(CVAL(buf,0) == SMBkeepalive) {
+ /* Ignore non-session messages. */
+ if(CVAL(buf,0)) {
return NT_STATUS_OK;
}
******************************************************************************/
#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
-static NTSTATUS srv_enc_spnego_gss_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob)
+static NTSTATUS srv_enc_spnego_gss_negotiate(const struct tsocket_address *remote_address,
+ unsigned char **ppdata,
+ size_t *p_data_size,
+ DATA_BLOB secblob)
{
OM_uint32 ret;
OM_uint32 min;
OM_uint32 flags = 0;
gss_buffer_desc in_buf, out_buf;
struct smb_tran_enc_state_gss *gss_state;
- DATA_BLOB auth_reply = data_blob(NULL,0);
- DATA_BLOB response = data_blob(NULL,0);
+ DATA_BLOB auth_reply = data_blob_null;
+ DATA_BLOB response = data_blob_null;
NTSTATUS status;
if (!partial_srv_trans_enc_ctx) {
- status = make_srv_encryption_context(SMB_TRANS_ENC_GSS, &partial_srv_trans_enc_ctx);
+ status = make_srv_encryption_context(remote_address,
+ SMB_TRANS_ENC_GSS,
+ &partial_srv_trans_enc_ctx);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
out_buf.value = NULL;
out_buf.length = 0;
+ become_root();
+
ret = gss_accept_sec_context(&min,
&gss_state->gss_ctx,
gss_state->creds,
&flags,
NULL, /* Ingore time. */
NULL); /* Ignore delegated creds. */
+ unbecome_root();
status = gss_err_to_ntstatus(ret, min);
if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
gss_release_buffer(&min, &out_buf);
/* Wrap in SPNEGO. */
- response = spnego_gen_auth_response(&auth_reply, status, OID_KERBEROS5);
+ response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5);
data_blob_free(&auth_reply);
SAFE_FREE(*ppdata);
- *ppdata = response.data;
+ *ppdata = (unsigned char *)memdup(response.data, response.length);
+ if ((*ppdata) == NULL && response.length > 0) {
+ status = NT_STATUS_NO_MEMORY;
+ }
*p_data_size = response.length;
+ data_blob_free(&response);
+
return status;
}
#endif
Until success we do everything on the partial enc ctx.
******************************************************************************/
-static NTSTATUS srv_enc_ntlm_negotiate(unsigned char **ppdata, size_t *p_data_size, DATA_BLOB secblob, BOOL spnego_wrap)
+static NTSTATUS srv_enc_ntlm_negotiate(const struct tsocket_address *remote_address,
+ unsigned char **ppdata,
+ size_t *p_data_size,
+ DATA_BLOB secblob,
+ bool spnego_wrap)
{
NTSTATUS status;
- DATA_BLOB chal = data_blob(NULL, 0);
- DATA_BLOB response = data_blob(NULL, 0);
+ DATA_BLOB chal = data_blob_null;
+ DATA_BLOB response = data_blob_null;
- status = make_srv_encryption_context(SMB_TRANS_ENC_NTLM, &partial_srv_trans_enc_ctx);
+ status = make_srv_encryption_context(remote_address,
+ SMB_TRANS_ENC_NTLM,
+ &partial_srv_trans_enc_ctx);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
- status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, secblob, &chal);
+ status = gensec_update(partial_srv_trans_enc_ctx->gensec_security,
+ partial_srv_trans_enc_ctx->gensec_security, NULL,
+ secblob, &chal);
/* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
* for success ... */
if (spnego_wrap) {
- response = spnego_gen_auth_response(&chal, status, OID_NTLMSSP);
+ response = spnego_gen_auth_response(talloc_tos(), &chal, status, OID_NTLMSSP);
data_blob_free(&chal);
} else {
/* Return the raw blob. */
}
SAFE_FREE(*ppdata);
- *ppdata = response.data;
+ *ppdata = (unsigned char *)memdup(response.data, response.length);
+ if ((*ppdata) == NULL && response.length > 0) {
+ status = NT_STATUS_NO_MEMORY;
+ }
*p_data_size = response.length;
+ data_blob_free(&response);
+
return status;
}
size_t *p_param_size)
{
NTSTATUS status;
- DATA_BLOB blob = data_blob(NULL,0);
- DATA_BLOB secblob = data_blob(NULL, 0);
- BOOL got_kerberos_mechanism = False;
+ DATA_BLOB blob = data_blob_null;
+ DATA_BLOB secblob = data_blob_null;
+ char *kerb_mech = NULL;
blob = data_blob_const(*ppdata, *p_data_size);
- status = parse_spnego_mechanisms(blob, &secblob, &got_kerberos_mechanism);
+ status = parse_spnego_mechanisms(talloc_tos(), blob, &secblob, &kerb_mech);
if (!NT_STATUS_IS_OK(status)) {
return nt_status_squash(status);
}
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
+ if (kerb_mech) {
+ TALLOC_FREE(kerb_mech);
+
#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
- if (got_kerberos_mechanism && lp_use_kerberos_keytab() ) {
- status = srv_enc_spnego_gss_negotiate(ppdata, p_data_size, secblob);
- } else
+ status = srv_enc_spnego_gss_negotiate(conn->sconn->remote_address,
+ ppdata,
+ p_data_size,
+ secblob);
+#else
+ /* Currently we don't SPNEGO negotiate
+ * back to NTLMSSP as we do in sessionsetupX. We should... */
+ return NT_STATUS_LOGON_FAILURE;
#endif
- {
- status = srv_enc_ntlm_negotiate(ppdata, p_data_size, secblob, True);
+ } else {
+ status = srv_enc_ntlm_negotiate(conn->sconn->remote_address,
+ ppdata,
+ p_data_size,
+ secblob,
+ true);
}
data_blob_free(&secblob);
if (NT_STATUS_IS_OK(status)) {
/* Return the context we're using for this encryption state. */
- *pparam = SMB_MALLOC(2);
- if (!*pparam) {
+ if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
return NT_STATUS_NO_MEMORY;
}
SSVAL(*pparam,0,partial_srv_trans_enc_ctx->es->enc_ctx_num);
size_t *p_param_size)
{
NTSTATUS status;
- DATA_BLOB blob = data_blob(NULL,0);
- DATA_BLOB auth = data_blob(NULL,0);
- DATA_BLOB auth_reply = data_blob(NULL,0);
- DATA_BLOB response = data_blob(NULL,0);
+ DATA_BLOB blob = data_blob_null;
+ DATA_BLOB auth = data_blob_null;
+ DATA_BLOB auth_reply = data_blob_null;
+ DATA_BLOB response = data_blob_null;
struct smb_srv_trans_enc_ctx *ec = partial_srv_trans_enc_ctx;
/* We must have a partial context here. */
- if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
+ if (!ec || !ec->es || ec->gensec_security == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
blob = data_blob_const(*ppdata, *p_data_size);
- if (!spnego_parse_auth(blob, &auth)) {
+ if (!spnego_parse_auth(talloc_tos(), blob, &auth)) {
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
- status = auth_ntlmssp_update(ec->auth_ntlmssp_state, auth, &auth_reply);
+ status = gensec_update(ec->gensec_security, talloc_tos(), NULL, auth, &auth_reply);
data_blob_free(&auth);
- response = spnego_gen_auth_response(&auth_reply, status, OID_NTLMSSP);
+ /* From RFC4178.
+ *
+ * supportedMech
+ *
+ * This field SHALL only be present in the first reply from the
+ * target.
+ * So set mechOID to NULL here.
+ */
+
+ response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, NULL);
data_blob_free(&auth_reply);
if (NT_STATUS_IS_OK(status)) {
/* Return the context we're using for this encryption state. */
- *pparam = SMB_MALLOC(2);
- if (!*pparam) {
+ if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
return NT_STATUS_NO_MEMORY;
}
SSVAL(*pparam,0,ec->es->enc_ctx_num);
}
SAFE_FREE(*ppdata);
- *ppdata = response.data;
+ *ppdata = (unsigned char *)memdup(response.data, response.length);
+ if ((*ppdata) == NULL && response.length > 0)
+ return NT_STATUS_NO_MEMORY;
*p_data_size = response.length;
+ data_blob_free(&response);
return status;
}
{
NTSTATUS status;
DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
- DATA_BLOB response = data_blob(NULL,0);
+ DATA_BLOB response = data_blob_null;
struct smb_srv_trans_enc_ctx *ec;
if (!partial_srv_trans_enc_ctx) {
/* This is the initial step. */
- status = srv_enc_ntlm_negotiate(ppdata, p_data_size, blob, False);
+ status = srv_enc_ntlm_negotiate(conn->sconn->remote_address,
+ ppdata,
+ p_data_size,
+ blob,
+ false);
if (!NT_STATUS_EQUAL(status,NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
return nt_status_squash(status);
}
ec = partial_srv_trans_enc_ctx;
- if (!ec || !ec->es || ec->auth_ntlmssp_state == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
+ if (!ec || !ec->es || ec->gensec_security == NULL || ec->es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
/* Second step. */
- status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state, blob, &response);
+ status = gensec_update(partial_srv_trans_enc_ctx->gensec_security,
+ talloc_tos(), NULL,
+ blob, &response);
if (NT_STATUS_IS_OK(status)) {
/* Return the context we're using for this encryption state. */
- *pparam = SMB_MALLOC(2);
- if (!*pparam) {
+ if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
return NT_STATUS_NO_MEMORY;
}
SSVAL(*pparam,0,ec->es->enc_ctx_num);
/* Return the raw blob. */
SAFE_FREE(*ppdata);
- *ppdata = response.data;
+ *ppdata = (unsigned char *)memdup(response.data, response.length);
+ if ((*ppdata) == NULL && response.length > 0)
+ return NT_STATUS_NO_MEMORY;
*p_data_size = response.length;
+ data_blob_free(&response);
return status;
}
}
if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
- if ((ec->es->s.ntlmssp_state->neg_flags & (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) !=
- (NTLMSSP_NEGOTIATE_SIGN|NTLMSSP_NEGOTIATE_SEAL)) {
+ if (!gensec_have_feature(ec->gensec_security, GENSEC_FEATURE_SIGN)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (!gensec_have_feature(ec->gensec_security, GENSEC_FEATURE_SEAL)) {
return NT_STATUS_INVALID_PARAMETER;
}
}
/* Steal the partial pointer. Deliberate shallow copy. */
srv_trans_enc_ctx = partial_srv_trans_enc_ctx;
- srv_trans_enc_ctx->es->enc_on = True;
+ srv_trans_enc_ctx->es->enc_on = true;
partial_srv_trans_enc_ctx = NULL;
+
+ DEBUG(1,("srv_encryption_start: context negotiated\n"));
return NT_STATUS_OK;
}
Shutdown all server contexts.
******************************************************************************/
-void server_encryption_shutdown(void)
+void server_encryption_shutdown(struct smbd_server_connection *sconn)
{
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
srv_free_encryption_context(&srv_trans_enc_ctx);
git.samba.org / abartlet / samba.git / .git / blobdiff