/* 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 <tevent.h> #include "version.h" #include "auth/gensec/gensec.h" #include "auth/auth.h" #include "smb_server/smb_server.h" #include "smbd/service_stream.h" #include "param/param.h" #include "../lib/tsocket/tsocket.h" #include "lib/stream/packet.h" struct sesssetup_context { struct auth4_context *auth_context; struct smbsrv_request *req; }; /* 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", lpcfg_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 tevent_req *subreq) { struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context); struct smbsrv_request *req = state->req; union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup); struct auth_user_info_dc *user_info_dc = NULL; struct auth_session_info *session_info; struct smbsrv_session *smb_sess; NTSTATUS status; uint32_t flags; status = auth_check_password_recv(subreq, req, &user_info_dc); TALLOC_FREE(subreq); if (!NT_STATUS_IS_OK(status)) goto failed; flags = AUTH_SESSION_INFO_DEFAULT_GROUPS; if (user_info_dc->info->authenticated) { flags |= AUTH_SESSION_INFO_AUTHENTICATED; } /* This references user_info_dc into session_info */ status = req->smb_conn->negotiate.auth_context->generate_session_info(req, req->smb_conn->negotiate.auth_context, user_info_dc, flags, &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 = 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 tsocket_address *remote_address; const char *remote_machine = NULL; struct tevent_req *subreq; struct sesssetup_context *state; 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_remote_addr(req->smb_conn->connection->socket, req); if (!remote_address) goto nomem; if (!remote_machine) { remote_machine = tsocket_address_inet_addr_string(remote_address, req); if (!remote_machine) goto nomem; } user_info = talloc_zero(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); state = talloc(req, struct sesssetup_context); if (!state) goto nomem; if (req->smb_conn->negotiate.auth_context) { state->auth_context = req->smb_conn->negotiate.auth_context; } else { /* TODO: should we use just "anonymous" here? */ NTSTATUS status = auth_context_create(state, req->smb_conn->connection->event.ctx, req->smb_conn->connection->msg_ctx, req->smb_conn->lp_ctx, &state->auth_context); if (!NT_STATUS_IS_OK(status)) { smbsrv_sesssetup_backend_send(req, sess, status); return; } } state->req = req; subreq = auth_check_password_send(state, req->smb_conn->connection->event.ctx, req->smb_conn->negotiate.auth_context, user_info); if (!subreq) goto nomem; tevent_req_set_callback(subreq, sesssetup_old_send, state); return; nomem: smbsrv_sesssetup_backend_send(req, sess, NT_STATUS_NO_MEMORY); } static void sesssetup_nt1_send(struct tevent_req *subreq) { struct sesssetup_context *state = tevent_req_callback_data(subreq, struct sesssetup_context); struct smbsrv_request *req = state->req; union smb_sesssetup *sess = talloc_get_type(req->io_ptr, union smb_sesssetup); struct auth_user_info_dc *user_info_dc = NULL; struct auth_session_info *session_info; struct smbsrv_session *smb_sess; uint32_t flags; NTSTATUS status; status = auth_check_password_recv(subreq, req, &user_info_dc); TALLOC_FREE(subreq); if (!NT_STATUS_IS_OK(status)) goto failed; flags = AUTH_SESSION_INFO_DEFAULT_GROUPS; if (user_info_dc->info->authenticated) { flags |= AUTH_SESSION_INFO_AUTHENTICATED; } /* This references user_info_dc into session_info */ status = state->auth_context->generate_session_info(req, state->auth_context, user_info_dc, flags, &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; } done: status = NT_STATUS_OK; failed: status = 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_usersupplied_info *user_info = NULL; struct tsocket_address *remote_address; const char *remote_machine = NULL; struct tevent_req *subreq; struct sesssetup_context *state; 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; } state = talloc(req, struct sesssetup_context); if (!state) goto nomem; state->req = req; 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(state, req->smb_conn->connection->event.ctx, req->smb_conn->connection->msg_ctx, req->smb_conn->lp_ctx, &state->auth_context); if (!NT_STATUS_IS_OK(status)) goto failed; } else if (req->smb_conn->negotiate.auth_context) { state->auth_context = req->smb_conn->negotiate.auth_context; } else { /* TODO: should we use just "anonymous" here? */ status = auth_context_create(state, req->smb_conn->connection->event.ctx, req->smb_conn->connection->msg_ctx, req->smb_conn->lp_ctx, &state->auth_context); if (!NT_STATUS_IS_OK(status)) goto failed; } if (req->smb_conn->negotiate.calling_name) { remote_machine = req->smb_conn->negotiate.calling_name->name; } remote_address = socket_get_remote_addr(req->smb_conn->connection->socket, req); if (!remote_address) goto nomem; if (!remote_machine) { remote_machine = tsocket_address_inet_addr_string(remote_address, req); if (!remote_machine) goto nomem; } user_info = talloc_zero(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); subreq = auth_check_password_send(state, req->smb_conn->connection->event.ctx, state->auth_context, user_info); if (!subreq) goto nomem; tevent_req_set_callback(subreq, sesssetup_nt1_send, state); return; nomem: status = NT_STATUS_NO_MEMORY; failed: status = 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 tevent_req *subreq) { struct sesssetup_spnego_state *s = tevent_req_callback_data(subreq, 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(subreq, req, &sess->spnego.out.secblob); packet_recv_enable(req->smb_conn->packet); TALLOC_FREE(subreq); 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); } /* 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 = 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; struct tevent_req *subreq; 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 = samba_server_gensec_start(req, req->smb_conn->connection->event.ctx, req->smb_conn->connection->msg_ctx, req->smb_conn->lp_ctx, req->smb_conn->negotiate.server_credentials, "cifs", &gensec_ctx); if (!NT_STATUS_IS_OK(status)) { DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status))); goto failed; } 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(gensec_ctx, 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; subreq = gensec_update_send(s, req->smb_conn->connection->event.ctx, smb_sess->gensec_ctx, sess->spnego.in.secblob); if (!subreq) { goto nomem; } /* disable receipt of more packets on this socket until we've finished with the session setup. This avoids a problem with crashes if we get EOF on the socket while processing a session setup */ packet_recv_disable(req->smb_conn->packet); tevent_req_set_callback(subreq, sesssetup_spnego_send, s); return; nomem: status = NT_STATUS_NO_MEMORY; failed: talloc_free(smb_sess); status = 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); }