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 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 "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/auth/spnego.h"
-#include "../libcli/auth/ntlmssp.h"
-#include "ntlmssp_wrap.h"
-#include "smb_crypt.h"
+#include "../libcli/smb/smb_seal.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.
******************************************************************************/
-/******************************************************************************
- Global server state.
-******************************************************************************/
-
-struct smb_srv_trans_enc_ctx {
- struct smb_trans_enc_state *es;
- struct auth_ntlmssp_state *auth_ntlmssp_state; /* Must be kept in sync with pointer in ec->ntlmssp_state. */
-};
-
/******************************************************************************
Return global enc context - this must change if we ever do multiple contexts.
******************************************************************************/
-uint16_t srv_enc_ctx(void)
+static uint16_t srv_enc_ctx(const struct smb_trans_enc_state *es)
{
- return srv_trans_enc_ctx->es->enc_ctx_num;
+ return es->enc_ctx_num;
}
/******************************************************************************
Is this an incoming encrypted packet ?
******************************************************************************/
-bool is_encrypted_packet(const uint8_t *inbuf)
+bool is_encrypted_packet(struct smbd_server_connection *sconn,
+ const uint8_t *inbuf)
{
NTSTATUS status;
uint16_t enc_num;
}
/* Encrypted messages are 0xFF'E'<ctx> */
- if (srv_trans_enc_ctx && enc_num == srv_enc_ctx()) {
+ if (srv_trans_enc_ctx && enc_num == srv_enc_ctx(srv_trans_enc_ctx)) {
return true;
}
return false;
}
/******************************************************************************
- Create an auth_ntlmssp_state and ensure pointer copy is correct.
+ Create an gensec_security and ensure pointer copy is correct.
******************************************************************************/
-static NTSTATUS make_auth_ntlmssp(const struct tsocket_address *remote_address,
- struct smb_srv_trans_enc_ctx *ec)
+static NTSTATUS make_auth_gensec(const struct tsocket_address *remote_address,
+ struct smb_trans_enc_state *es, const char *oid)
{
- NTSTATUS status = auth_ntlmssp_start(remote_address,
- &ec->auth_ntlmssp_state);
+ struct gensec_security *gensec_security;
+ NTSTATUS status = auth_generic_prepare(NULL, remote_address,
+ &gensec_security);
if (!NT_STATUS_IS_OK(status)) {
return nt_status_squash(status);
}
- auth_ntlmssp_want_feature(ec->auth_ntlmssp_state, NTLMSSP_FEATURE_SEAL);
-
- /*
- * We must remember to update the pointer copy for the common
- * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
- */
- ec->es->s.auth_ntlmssp_state = ec->auth_ntlmssp_state;
- return status;
-}
-
-/******************************************************************************
- Destroy an auth_ntlmssp_state and ensure pointer copy is correct.
-******************************************************************************/
+ gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
-static void destroy_auth_ntlmssp(struct smb_srv_trans_enc_ctx *ec)
-{
/*
- * We must remember to update the pointer copy for the common
- * functions after any auth_ntlmssp_start/auth_ntlmssp_end.
- */
-
- if (ec->auth_ntlmssp_state) {
- TALLOC_FREE(ec->auth_ntlmssp_state);
- /* The auth_ntlmssp_end killed this already. */
- ec->es->s.auth_ntlmssp_state = NULL;
- }
-}
-
-#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
-
-/******************************************************************************
- Import a name.
-******************************************************************************/
-
-static NTSTATUS get_srv_gss_creds(const char *service,
- const char *name,
- gss_cred_usage_t cred_type,
- gss_cred_id_t *p_srv_cred)
-{
- OM_uint32 ret;
- OM_uint32 min;
- gss_name_t srv_name;
- gss_buffer_desc input_name;
- char *host_princ_s = NULL;
- NTSTATUS status = NT_STATUS_OK;
-
- gss_OID_desc nt_hostbased_service =
- {10, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04")};
-
- if (asprintf(&host_princ_s, "%s@%s", service, name) == -1) {
- return NT_STATUS_NO_MEMORY;
- }
-
- input_name.value = host_princ_s;
- input_name.length = strlen(host_princ_s) + 1;
-
- ret = gss_import_name(&min,
- &input_name,
- &nt_hostbased_service,
- &srv_name);
-
- DEBUG(10,("get_srv_gss_creds: imported name %s\n",
- host_princ_s ));
-
- if (ret != GSS_S_COMPLETE) {
- SAFE_FREE(host_princ_s);
- return map_nt_error_from_gss(ret, min);
- }
-
- /*
- * We're accessing the krb5.keytab file here.
+ * We could be accessing the secrets.tdb or krb5.keytab file here.
* ensure we have permissions to do so.
*/
become_root();
- ret = gss_acquire_cred(&min,
- srv_name,
- GSS_C_INDEFINITE,
- GSS_C_NULL_OID_SET,
- cred_type,
- p_srv_cred,
- NULL,
- NULL);
- unbecome_root();
-
- if (ret != GSS_S_COMPLETE) {
- ADS_STATUS adss = ADS_ERROR_GSS(ret, min);
- DEBUG(10,("get_srv_gss_creds: gss_acquire_cred failed with %s\n",
- ads_errstr(adss)));
- status = map_nt_error_from_gss(ret, min);
- }
-
- SAFE_FREE(host_princ_s);
- gss_release_name(&min, &srv_name);
- return status;
-}
-
-/******************************************************************************
- Create a gss state.
- Try and get the cifs/server@realm principal first, then fall back to
- host/server@realm.
-******************************************************************************/
-
-static NTSTATUS make_auth_gss(struct smb_srv_trans_enc_ctx *ec)
-{
- NTSTATUS status;
- gss_cred_id_t srv_cred;
- fstring fqdn;
+ status = gensec_start_mech_by_oid(gensec_security, oid);
- name_to_fqdn(fqdn, lp_netbios_name());
- strlower_m(fqdn);
+ unbecome_root();
- status = get_srv_gss_creds("cifs", fqdn, GSS_C_ACCEPT, &srv_cred);
if (!NT_STATUS_IS_OK(status)) {
- status = get_srv_gss_creds("host", fqdn, GSS_C_ACCEPT, &srv_cred);
- if (!NT_STATUS_IS_OK(status)) {
- return nt_status_squash(status);
- }
- }
-
- ec->es->s.gss_state = SMB_MALLOC_P(struct smb_tran_enc_state_gss);
- if (!ec->es->s.gss_state) {
- OM_uint32 min;
- gss_release_cred(&min, &srv_cred);
- return NT_STATUS_NO_MEMORY;
+ TALLOC_FREE(gensec_security);
+ return nt_status_squash(status);
}
- ZERO_STRUCTP(ec->es->s.gss_state);
- ec->es->s.gss_state->creds = srv_cred;
- /* No context yet. */
- ec->es->s.gss_state->gss_ctx = GSS_C_NO_CONTEXT;
+ es->gensec_security = gensec_security;
- return NT_STATUS_OK;
+ return status;
}
-#endif
/******************************************************************************
Shutdown a server encryption context.
******************************************************************************/
-static void srv_free_encryption_context(struct smb_srv_trans_enc_ctx **pp_ec)
+static void srv_free_encryption_context(struct smb_trans_enc_state **pp_es)
{
- struct smb_srv_trans_enc_ctx *ec = *pp_ec;
+ struct smb_trans_enc_state *es = *pp_es;
- if (!ec) {
+ if (!es) {
return;
}
- if (ec->es) {
- switch (ec->es->smb_enc_type) {
- case SMB_TRANS_ENC_NTLM:
- destroy_auth_ntlmssp(ec);
- break;
-#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
- case SMB_TRANS_ENC_GSS:
- break;
-#endif
- }
- common_free_encryption_state(&ec->es);
- }
+ common_free_encryption_state(&es);
- SAFE_FREE(ec);
- *pp_ec = NULL;
+ SAFE_FREE(es);
+ *pp_es = NULL;
}
/******************************************************************************
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_trans_enc_state **pp_es)
{
- struct smb_srv_trans_enc_ctx *ec;
+ NTSTATUS status;
+ const char *oid;
+ struct smb_trans_enc_state *es;
- *pp_ec = NULL;
+ *pp_es = NULL;
- ec = SMB_MALLOC_P(struct smb_srv_trans_enc_ctx);
- if (!ec) {
- return NT_STATUS_NO_MEMORY;
- }
ZERO_STRUCTP(partial_srv_trans_enc_ctx);
- ec->es = SMB_MALLOC_P(struct smb_trans_enc_state);
- if (!ec->es) {
- SAFE_FREE(ec);
+ es = SMB_MALLOC_P(struct smb_trans_enc_state);
+ if (!es) {
return NT_STATUS_NO_MEMORY;
}
- ZERO_STRUCTP(ec->es);
- ec->es->smb_enc_type = smb_enc_type;
+ ZERO_STRUCTP(es);
+ es->smb_enc_type = smb_enc_type;
switch (smb_enc_type) {
case SMB_TRANS_ENC_NTLM:
- {
- NTSTATUS status = make_auth_ntlmssp(remote_address,
- ec);
- if (!NT_STATUS_IS_OK(status)) {
- srv_free_encryption_context(&ec);
- return status;
- }
- }
+ oid = GENSEC_OID_NTLMSSP;
break;
-
-#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
case SMB_TRANS_ENC_GSS:
- /* Acquire our credentials by calling gss_acquire_cred here. */
- {
- NTSTATUS status = make_auth_gss(ec);
- if (!NT_STATUS_IS_OK(status)) {
- srv_free_encryption_context(&ec);
- return status;
- }
- }
+ oid = GENSEC_OID_KERBEROS5;
break;
-#endif
default:
- srv_free_encryption_context(&ec);
+ srv_free_encryption_context(&es);
return NT_STATUS_INVALID_PARAMETER;
}
- *pp_ec = ec;
+ status = make_auth_gensec(remote_address,
+ es, oid);
+ if (!NT_STATUS_IS_OK(status)) {
+ srv_free_encryption_context(&es);
+ return status;
+ }
+ *pp_es = es;
return NT_STATUS_OK;
}
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,
}
if (srv_trans_enc_ctx) {
- common_free_enc_buffer(srv_trans_enc_ctx->es, buf);
+ common_free_enc_buffer(srv_trans_enc_ctx, buf);
}
}
Decrypt an incoming buffer.
******************************************************************************/
-NTSTATUS srv_decrypt_buffer(char *buf)
+NTSTATUS srv_decrypt_buffer(struct smbd_server_connection *sconn, char *buf)
{
/* Ignore non-session messages. */
if(CVAL(buf,0)) {
}
if (srv_trans_enc_ctx) {
- return common_decrypt_buffer(srv_trans_enc_ctx->es, buf);
+ return common_decrypt_buffer(srv_trans_enc_ctx, buf);
}
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;
}
if (srv_trans_enc_ctx) {
- return common_encrypt_buffer(srv_trans_enc_ctx->es, buf, buf_out);
+ return common_encrypt_buffer(srv_trans_enc_ctx, buf, buf_out);
}
/* Not encrypting. */
return NT_STATUS_OK;
Until success we do everything on the partial enc ctx.
******************************************************************************/
-#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
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;
- DATA_BLOB response = data_blob_null;
NTSTATUS status;
+ DATA_BLOB unwrapped_response = data_blob_null;
+ DATA_BLOB response = data_blob_null;
- if (!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;
- }
+ status = make_srv_encryption_context(remote_address,
+ SMB_TRANS_ENC_GSS,
+ &partial_srv_trans_enc_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
}
- gss_state = partial_srv_trans_enc_ctx->es->s.gss_state;
-
- in_buf.value = secblob.data;
- in_buf.length = secblob.length;
-
- out_buf.value = NULL;
- out_buf.length = 0;
-
become_root();
- ret = gss_accept_sec_context(&min,
- &gss_state->gss_ctx,
- gss_state->creds,
- &in_buf,
- GSS_C_NO_CHANNEL_BINDINGS,
- NULL,
- NULL, /* Ignore oids. */
- &out_buf, /* To return. */
- &flags,
- NULL, /* Ingore time. */
- NULL); /* Ignore delegated creds. */
- unbecome_root();
+ status = gensec_update(partial_srv_trans_enc_ctx->gensec_security,
+ talloc_tos(), NULL,
+ secblob, &unwrapped_response);
- status = gss_err_to_ntstatus(ret, min);
- if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
- return status;
- }
-
- /* Ensure we've got sign+seal available. */
- if (ret == GSS_S_COMPLETE) {
- if ((flags & (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) !=
- (GSS_C_INTEG_FLAG|GSS_C_CONF_FLAG|GSS_C_REPLAY_FLAG|GSS_C_SEQUENCE_FLAG)) {
- DEBUG(0,("srv_enc_spnego_gss_negotiate: quality of service not good enough "
- "for SMB sealing.\n"));
- gss_release_buffer(&min, &out_buf);
- return NT_STATUS_ACCESS_DENIED;
- }
- }
+ unbecome_root();
- auth_reply = data_blob(out_buf.value, out_buf.length);
- gss_release_buffer(&min, &out_buf);
+ /* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
+ * for success ... */
- /* Wrap in SPNEGO. */
- response = spnego_gen_auth_response(talloc_tos(), &auth_reply, status, OID_KERBEROS5);
- data_blob_free(&auth_reply);
+ response = spnego_gen_auth_response(talloc_tos(), &unwrapped_response, status, OID_KERBEROS5);
+ data_blob_free(&unwrapped_response);
SAFE_FREE(*ppdata);
*ppdata = (unsigned char *)memdup(response.data, response.length);
status = NT_STATUS_NO_MEMORY;
}
*p_data_size = response.length;
-
data_blob_free(&response);
return status;
}
-#endif
/******************************************************************************
Do the NTLM SPNEGO (or raw) encryption negotiation. Parameters are in/out.
return status;
}
- status = auth_ntlmssp_update(partial_srv_trans_enc_ctx->auth_ntlmssp_state,
- partial_srv_trans_enc_ctx->auth_ntlmssp_state,
- secblob, &chal);
+ status = gensec_update(partial_srv_trans_enc_ctx->gensec_security,
+ talloc_tos(), NULL,
+ secblob, &chal);
/* status here should be NT_STATUS_MORE_PROCESSING_REQUIRED
* for success ... */
if (kerb_mech) {
TALLOC_FREE(kerb_mech);
-#if defined(HAVE_GSSAPI) && defined(HAVE_KRB5)
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
} else {
status = srv_enc_ntlm_negotiate(conn->sconn->remote_address,
ppdata,
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);
+ SSVAL(*pparam,0,partial_srv_trans_enc_ctx->enc_ctx_num);
*p_param_size = 2;
}
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;
+ struct smb_trans_enc_state *es = 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 (!es || es->gensec_security == NULL || es->smb_enc_type != SMB_TRANS_ENC_NTLM) {
srv_free_encryption_context(&partial_srv_trans_enc_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
return NT_STATUS_INVALID_PARAMETER;
}
- status = auth_ntlmssp_update(ec->auth_ntlmssp_state, talloc_tos(), auth, &auth_reply);
+ status = gensec_update(es->gensec_security, talloc_tos(), NULL, auth, &auth_reply);
data_blob_free(&auth);
/* From RFC4178.
if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
return NT_STATUS_NO_MEMORY;
}
- SSVAL(*pparam,0,ec->es->enc_ctx_num);
+ SSVAL(*pparam,0,es->enc_ctx_num);
*p_param_size = 2;
}
NTSTATUS status;
DATA_BLOB blob = data_blob_const(*ppdata, *p_data_size);
DATA_BLOB response = data_blob_null;
- struct smb_srv_trans_enc_ctx *ec;
+ struct smb_trans_enc_state *es;
if (!partial_srv_trans_enc_ctx) {
/* This is the initial step. */
return 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) {
+ es = partial_srv_trans_enc_ctx;
+ if (!es || es->gensec_security == NULL || 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,
- talloc_tos(),
- 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. */
if (!(*pparam = SMB_MALLOC_ARRAY(unsigned char, 2))) {
return NT_STATUS_NO_MEMORY;
}
- SSVAL(*pparam,0,ec->es->enc_ctx_num);
+ SSVAL(*pparam, 0, es->enc_ctx_num);
*p_param_size = 2;
}
Negotiation was successful - turn on server-side encryption.
******************************************************************************/
-static NTSTATUS check_enc_good(struct smb_srv_trans_enc_ctx *ec)
+static NTSTATUS check_enc_good(struct smb_trans_enc_state *es)
{
- if (!ec || !ec->es) {
+ if (!es) {
return NT_STATUS_LOGON_FAILURE;
}
- if (ec->es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
- if (!auth_ntlmssp_negotiated_sign((ec->auth_ntlmssp_state))) {
+ if (es->smb_enc_type == SMB_TRANS_ENC_NTLM) {
+ if (!gensec_have_feature(es->gensec_security, GENSEC_FEATURE_SIGN)) {
return NT_STATUS_INVALID_PARAMETER;
}
- if (!auth_ntlmssp_negotiated_seal((ec->auth_ntlmssp_state))) {
+ if (!gensec_have_feature(es->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->enc_on = true;
partial_srv_trans_enc_ctx = NULL;
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 / ira / wip.git / blobdiff