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Diffstat (limited to 'source4/smb_server/smb/sesssetup.c')
-rw-r--r--source4/smb_server/smb/sesssetup.c465
1 files changed, 465 insertions, 0 deletions
diff --git a/source4/smb_server/smb/sesssetup.c b/source4/smb_server/smb/sesssetup.c
new file mode 100644
index 0000000000..f45cbf1756
--- /dev/null
+++ b/source4/smb_server/smb/sesssetup.c
@@ -0,0 +1,465 @@
+
+/*
+ Unix SMB/CIFS implementation.
+ handle SMBsessionsetup
+ Copyright (C) Andrew Tridgell 1998-2001
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
+ Copyright (C) Jim McDonough 2002
+ Copyright (C) Luke Howard 2003
+ Copyright (C) Stefan Metzmacher 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 "version.h"
+#include "auth/credentials/credentials.h"
+#include "auth/gensec/gensec.h"
+#include "auth/auth.h"
+#include "smb_server/smb_server.h"
+#include "smbd/service_stream.h"
+#include "librpc/gen_ndr/nbt.h"
+#include "param/param.h"
+
+/*
+ setup the OS, Lanman and domain portions of a session setup reply
+*/
+static void sesssetup_common_strings(struct smbsrv_request *req,
+ char **os, char **lanman, char **domain)
+{
+ (*os) = talloc_asprintf(req, "Unix");
+ (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
+ (*domain) = talloc_asprintf(req, "%s",
+ lp_workgroup(req->smb_conn->lp_ctx));
+}
+
+static void smbsrv_sesssetup_backend_send(struct smbsrv_request *req,
+ union smb_sesssetup *sess,
+ NTSTATUS status)
+{
+ if (NT_STATUS_IS_OK(status)) {
+ req->smb_conn->negotiate.done_sesssetup = true;
+ /* we need to keep the session long term */
+ req->session = talloc_steal(req->smb_conn, req->session);
+ }
+ smbsrv_reply_sesssetup_send(req, sess, status);
+}
+
+static void sesssetup_old_send(struct auth_check_password_request *areq,
+ void *private_data)
+{
+ struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
+ union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
+ struct auth_serversupplied_info *server_info = NULL;
+ struct auth_session_info *session_info;
+ struct smbsrv_session *smb_sess;
+ NTSTATUS status;
+
+ status = auth_check_password_recv(areq, req, &server_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* This references server_info into session_info */
+ status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx, req->smb_conn->lp_ctx,
+ server_info, &session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* allocate a new session */
+ smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
+ if (!smb_sess) {
+ status = NT_STATUS_INSUFFICIENT_RESOURCES;
+ goto failed;
+ }
+
+ /* Ensure this is marked as a 'real' vuid, not one
+ * simply valid for the session setup leg */
+ status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* To correctly process any AndX packet (like a tree connect)
+ * we need to fill in the session on the request here */
+ req->session = smb_sess;
+ sess->old.out.vuid = smb_sess->vuid;
+
+failed:
+ status = auth_nt_status_squash(status);
+ smbsrv_sesssetup_backend_send(req, sess, status);
+}
+
+/*
+ handler for old style session setup
+*/
+static void sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
+{
+ struct auth_usersupplied_info *user_info = NULL;
+ struct socket_address *remote_address;
+ const char *remote_machine = NULL;
+
+ sess->old.out.vuid = 0;
+ sess->old.out.action = 0;
+
+ sesssetup_common_strings(req,
+ &sess->old.out.os,
+ &sess->old.out.lanman,
+ &sess->old.out.domain);
+
+ if (!req->smb_conn->negotiate.done_sesssetup) {
+ req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
+ }
+
+ if (req->smb_conn->negotiate.calling_name) {
+ remote_machine = req->smb_conn->negotiate.calling_name->name;
+ }
+
+ remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
+ if (!remote_address) goto nomem;
+
+ if (!remote_machine) {
+ remote_machine = remote_address->addr;
+ }
+
+ user_info = talloc(req, struct auth_usersupplied_info);
+ if (!user_info) goto nomem;
+
+ user_info->mapped_state = false;
+ user_info->logon_parameters = 0;
+ user_info->flags = 0;
+ user_info->client.account_name = sess->old.in.user;
+ user_info->client.domain_name = sess->old.in.domain;
+ user_info->workstation_name = remote_machine;
+ user_info->remote_host = talloc_steal(user_info, remote_address);
+
+ user_info->password_state = AUTH_PASSWORD_RESPONSE;
+ user_info->password.response.lanman = sess->old.in.password;
+ user_info->password.response.lanman.data = talloc_steal(user_info, sess->old.in.password.data);
+ user_info->password.response.nt = data_blob(NULL, 0);
+
+ auth_check_password_send(req->smb_conn->negotiate.auth_context, user_info,
+ sesssetup_old_send, req);
+ return;
+
+nomem:
+ smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY);
+}
+
+static void sesssetup_nt1_send(struct auth_check_password_request *areq,
+ void *private_data)
+{
+ struct smbsrv_request *req = talloc_get_type(private_data, struct smbsrv_request);
+ union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup);
+ struct auth_serversupplied_info *server_info = NULL;
+ struct auth_session_info *session_info;
+ struct smbsrv_session *smb_sess;
+ NTSTATUS status;
+
+ status = auth_check_password_recv(areq, req, &server_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* This references server_info into session_info */
+ status = auth_generate_session_info(req, req->smb_conn->connection->event.ctx,
+ req->smb_conn->lp_ctx,
+ server_info, &session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* allocate a new session */
+ smb_sess = smbsrv_session_new(req->smb_conn, req, NULL);
+ if (!smb_sess) {
+ status = NT_STATUS_INSUFFICIENT_RESOURCES;
+ goto failed;
+ }
+
+ /* Ensure this is marked as a 'real' vuid, not one
+ * simply valid for the session setup leg */
+ status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ /* To correctly process any AndX packet (like a tree connect)
+ * we need to fill in the session on the request here */
+ req->session = smb_sess;
+ sess->nt1.out.vuid = smb_sess->vuid;
+
+ if (!smbsrv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
+ /* Already signing, or disabled */
+ goto done;
+ }
+
+ /* Force check of the request packet, now we know the session key */
+ smbsrv_signing_check_incoming(req);
+/* TODO: why don't we check the result here? */
+
+ /* Unfortunetly win2k3 as a client doesn't sign the request
+ * packet here, so we have to force signing to start again */
+
+ smbsrv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2,
+ session_info->server_info->authenticated);
+
+done:
+ status = NT_STATUS_OK;
+failed:
+ status = auth_nt_status_squash(status);
+ smbsrv_sesssetup_backend_send(req, sess, status);
+}
+
+/*
+ handler for NT1 style session setup
+*/
+static void sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
+{
+ NTSTATUS status;
+ struct auth_context *auth_context;
+ struct auth_usersupplied_info *user_info = NULL;
+ struct socket_address *remote_address;
+ const char *remote_machine = NULL;
+
+ sess->nt1.out.vuid = 0;
+ sess->nt1.out.action = 0;
+
+ sesssetup_common_strings(req,
+ &sess->nt1.out.os,
+ &sess->nt1.out.lanman,
+ &sess->nt1.out.domain);
+
+ if (!req->smb_conn->negotiate.done_sesssetup) {
+ req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
+ req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
+ }
+
+ if (req->smb_conn->negotiate.oid) {
+ if (sess->nt1.in.user && *sess->nt1.in.user) {
+ /* We can't accept a normal login, because we
+ * don't have a challenge */
+ status = NT_STATUS_LOGON_FAILURE;
+ goto failed;
+ }
+
+ /* TODO: should we use just "anonymous" here? */
+ status = auth_context_create(req,
+ req->smb_conn->connection->event.ctx,
+ req->smb_conn->connection->msg_ctx,
+ req->smb_conn->lp_ctx,
+ &auth_context);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+ } else {
+ auth_context = req->smb_conn->negotiate.auth_context;
+ }
+
+ if (req->smb_conn->negotiate.calling_name) {
+ remote_machine = req->smb_conn->negotiate.calling_name->name;
+ }
+
+ remote_address = socket_get_peer_addr(req->smb_conn->connection->socket, req);
+ if (!remote_address) goto nomem;
+
+ if (!remote_machine) {
+ remote_machine = remote_address->addr;
+ }
+
+ user_info = talloc(req, struct auth_usersupplied_info);
+ if (!user_info) goto nomem;
+
+ user_info->mapped_state = false;
+ user_info->logon_parameters = 0;
+ user_info->flags = 0;
+ user_info->client.account_name = sess->nt1.in.user;
+ user_info->client.domain_name = sess->nt1.in.domain;
+ user_info->workstation_name = remote_machine;
+ user_info->remote_host = talloc_steal(user_info, remote_address);
+
+ user_info->password_state = AUTH_PASSWORD_RESPONSE;
+ user_info->password.response.lanman = sess->nt1.in.password1;
+ user_info->password.response.lanman.data = talloc_steal(user_info, sess->nt1.in.password1.data);
+ user_info->password.response.nt = sess->nt1.in.password2;
+ user_info->password.response.nt.data = talloc_steal(user_info, sess->nt1.in.password2.data);
+
+ auth_check_password_send(auth_context, user_info,
+ sesssetup_nt1_send, req);
+ return;
+
+nomem:
+ status = NT_STATUS_NO_MEMORY;
+failed:
+ status = auth_nt_status_squash(status);
+ smbsrv_sesssetup_backend_send(req, sess, status);
+}
+
+struct sesssetup_spnego_state {
+ struct smbsrv_request *req;
+ union smb_sesssetup *sess;
+ struct smbsrv_session *smb_sess;
+};
+
+static void sesssetup_spnego_send(struct gensec_update_request *greq, void *private_data)
+{
+ struct sesssetup_spnego_state *s = talloc_get_type(private_data,
+ struct sesssetup_spnego_state);
+ struct smbsrv_request *req = s->req;
+ union smb_sesssetup *sess = s->sess;
+ struct smbsrv_session *smb_sess = s->smb_sess;
+ struct auth_session_info *session_info = NULL;
+ NTSTATUS status;
+ NTSTATUS skey_status;
+ DATA_BLOB session_key;
+
+ status = gensec_update_recv(greq, req, &sess->spnego.out.secblob);
+ if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+ goto done;
+ } else if (!NT_STATUS_IS_OK(status)) {
+ goto failed;
+ }
+
+ status = gensec_session_info(smb_sess->gensec_ctx, &session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ skey_status = gensec_session_key(smb_sess->gensec_ctx, &session_key);
+ if (NT_STATUS_IS_OK(skey_status) &&
+ smbsrv_setup_signing(req->smb_conn, &session_key, NULL)) {
+ /* Force check of the request packet, now we know the session key */
+ smbsrv_signing_check_incoming(req);
+
+ smbsrv_signing_restart(req->smb_conn, &session_key, NULL,
+ session_info->server_info->authenticated);
+ }
+
+ /* Ensure this is marked as a 'real' vuid, not one
+ * simply valid for the session setup leg */
+ status = smbsrv_session_sesssetup_finished(smb_sess, session_info);
+ if (!NT_STATUS_IS_OK(status)) goto failed;
+
+ req->session = smb_sess;
+
+done:
+ sess->spnego.out.vuid = smb_sess->vuid;
+failed:
+ status = auth_nt_status_squash(status);
+ smbsrv_sesssetup_backend_send(req, sess, status);
+ if (!NT_STATUS_IS_OK(status) &&
+ !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+ talloc_free(smb_sess);
+ }
+}
+
+/*
+ handler for SPNEGO style session setup
+*/
+static void sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
+{
+ NTSTATUS status;
+ struct smbsrv_session *smb_sess = NULL;
+ struct sesssetup_spnego_state *s = NULL;
+ uint16_t vuid;
+
+ sess->spnego.out.vuid = 0;
+ sess->spnego.out.action = 0;
+
+ sesssetup_common_strings(req,
+ &sess->spnego.out.os,
+ &sess->spnego.out.lanman,
+ &sess->spnego.out.workgroup);
+
+ if (!req->smb_conn->negotiate.done_sesssetup) {
+ req->smb_conn->negotiate.max_send = sess->spnego.in.bufsize;
+ req->smb_conn->negotiate.client_caps = sess->spnego.in.capabilities;
+ }
+
+ vuid = SVAL(req->in.hdr,HDR_UID);
+
+ /* lookup an existing session */
+ smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid);
+ if (!smb_sess) {
+ struct gensec_security *gensec_ctx;
+
+ status = gensec_server_start(req,
+ req->smb_conn->connection->event.ctx,
+ req->smb_conn->lp_ctx,
+ req->smb_conn->connection->msg_ctx,
+ &gensec_ctx);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
+ goto failed;
+ }
+
+ gensec_set_credentials(gensec_ctx, req->smb_conn->negotiate.server_credentials);
+
+ gensec_set_target_service(gensec_ctx, "cifs");
+
+ gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY);
+
+ status = gensec_start_mech_by_oid(gensec_ctx, req->smb_conn->negotiate.oid);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("Failed to start GENSEC %s server code: %s\n",
+ gensec_get_name_by_oid(req->smb_conn->negotiate.oid), nt_errstr(status)));
+ goto failed;
+ }
+
+ /* allocate a new session */
+ smb_sess = smbsrv_session_new(req->smb_conn, req->smb_conn, gensec_ctx);
+ if (!smb_sess) {
+ status = NT_STATUS_INSUFFICIENT_RESOURCES;
+ goto failed;
+ }
+ }
+
+ if (!smb_sess) {
+ status = NT_STATUS_ACCESS_DENIED;
+ goto failed;
+ }
+
+ if (!smb_sess->gensec_ctx) {
+ status = NT_STATUS_INTERNAL_ERROR;
+ DEBUG(1, ("Internal ERROR: no gensec_ctx on session: %s\n", nt_errstr(status)));
+ goto failed;
+ }
+
+ s = talloc(req, struct sesssetup_spnego_state);
+ if (!s) goto nomem;
+ s->req = req;
+ s->sess = sess;
+ s->smb_sess = smb_sess;
+
+ gensec_update_send(smb_sess->gensec_ctx, sess->spnego.in.secblob,
+ sesssetup_spnego_send, s);
+ return;
+
+nomem:
+ status = NT_STATUS_NO_MEMORY;
+failed:
+ talloc_free(smb_sess);
+ status = auth_nt_status_squash(status);
+ smbsrv_sesssetup_backend_send(req, sess, status);
+}
+
+/*
+ backend for sessionsetup call - this takes all 3 variants of the call
+*/
+void smbsrv_sesssetup_backend(struct smbsrv_request *req,
+ union smb_sesssetup *sess)
+{
+ switch (sess->old.level) {
+ case RAW_SESSSETUP_OLD:
+ sesssetup_old(req, sess);
+ return;
+
+ case RAW_SESSSETUP_NT1:
+ sesssetup_nt1(req, sess);
+ return;
+
+ case RAW_SESSSETUP_SPNEGO:
+ sesssetup_spnego(req, sess);
+ return;
+
+ case RAW_SESSSETUP_SMB2:
+ break;
+ }
+
+ smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_INVALID_LEVEL);
+}
generated by cgit (git 2.34.1) at 2025-03-31 08:10:27 +0000