/* 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 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 (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. */ #include "includes.h" #include "version.h" #include "auth/auth.h" #include "smb_server/smb_server.h" #include "smbd/service_stream.h" #include "libcli/nbt/libnbt.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()); } /* handler for old style session setup */ static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess) { NTSTATUS status; struct auth_usersupplied_info *user_info = NULL; struct auth_serversupplied_info *server_info = NULL; struct auth_session_info *session_info; struct smbsrv_session *smb_sess; const char *remote_machine = NULL; TALLOC_CTX *mem_ctx; sess->old.out.vuid = UID_FIELD_INVALID; sess->old.out.action = 0; mem_ctx = talloc_named(req, 0, "OLD session setup"); NT_STATUS_HAVE_NO_MEMORY(mem_ctx); if (!req->smb_conn->negotiate.done_sesssetup) { req->smb_conn->negotiate.max_send = sess->old.in.bufsize; } if (req->smb_conn->negotiate.called_name) { remote_machine = req->smb_conn->negotiate.called_name->name; } if (!remote_machine) { remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx); } user_info = talloc(req->smb_conn, struct auth_usersupplied_info); if (!user_info) { talloc_free(mem_ctx); return NT_STATUS_NO_MEMORY; } user_info->mapped_state = False; 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 = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx); 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); status = auth_check_password(req->smb_conn->negotiate.auth_context, mem_ctx, user_info, &server_info); if (!NT_STATUS_IS_OK(status)) { talloc_free(mem_ctx); return auth_nt_status_squash(status); } /* This references server_info into session_info */ status = auth_generate_session_info(req, server_info, &session_info); talloc_free(mem_ctx); if (!NT_STATUS_IS_OK(status)) { return auth_nt_status_squash(status); } smb_sess = smbsrv_register_session(req->smb_conn, session_info, NULL); if (!smb_sess) { return NT_STATUS_ACCESS_DENIED; } /* Ensure this is marked as a 'real' vuid, not one * simply valid for the session setup leg */ smb_sess->finished_sesssetup = True; /* 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; sesssetup_common_strings(req, &sess->old.out.os, &sess->old.out.lanman, &sess->old.out.domain); return NT_STATUS_OK; } /* handler for NT1 style session setup */ static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess) { NTSTATUS status; const char *remote_machine = NULL; struct auth_context *auth_context; struct smbsrv_session *smb_sess; struct auth_usersupplied_info *user_info = NULL; struct auth_serversupplied_info *server_info = NULL; struct auth_session_info *session_info; TALLOC_CTX *mem_ctx; sess->nt1.out.vuid = UID_FIELD_INVALID; sess->nt1.out.action = 0; mem_ctx = talloc_named(req, 0, "NT1 session setup"); NT_STATUS_HAVE_NO_MEMORY(mem_ctx); 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.spnego_negotiated) { if (sess->nt1.in.user && *sess->nt1.in.user) { talloc_free(mem_ctx); /* We can't accept a normal login, because we * don't have a challenge */ return NT_STATUS_LOGON_FAILURE; } /* TODO: should we use just "anonymous" here? */ status = auth_context_create(mem_ctx, lp_auth_methods(), &auth_context, req->smb_conn->connection->event.ctx); if (!NT_STATUS_IS_OK(status)) { talloc_free(mem_ctx); return status; } } else { auth_context = req->smb_conn->negotiate.auth_context; } if (req->smb_conn->negotiate.called_name) { remote_machine = req->smb_conn->negotiate.called_name->name; } if (!remote_machine) { remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx); } user_info = talloc(req->smb_conn, struct auth_usersupplied_info); if (!user_info) { talloc_free(mem_ctx); return NT_STATUS_NO_MEMORY; } user_info->mapped_state = False; 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 = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx); 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); status = auth_check_password(auth_context, mem_ctx, user_info, &server_info); if (!NT_STATUS_IS_OK(status)) { talloc_free(mem_ctx); return auth_nt_status_squash(status); } /* This references server_info into session_info */ status = auth_generate_session_info(mem_ctx, server_info, &session_info); if (!NT_STATUS_IS_OK(status)) { talloc_free(mem_ctx); return auth_nt_status_squash(status); } smb_sess = smbsrv_register_session(req->smb_conn, session_info, NULL); talloc_free(mem_ctx); if (!smb_sess) { return NT_STATUS_ACCESS_DENIED; } /* Ensure this is marked as a 'real' vuid, not one * simply valid for the session setup leg */ smb_sess->finished_sesssetup = True; /* 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; sesssetup_common_strings(req, &sess->nt1.out.os, &sess->nt1.out.lanman, &sess->nt1.out.domain); req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid); if (!session_info->server_info->authenticated) { return NT_STATUS_OK; } if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) { /* Already signing, or disabled */ return NT_STATUS_OK; } /* Force check of the request packet, now we know the session key */ req_signing_check_incoming(req); /* Unfortunetly win2k3 as a client doesn't sign the request * packet here, so we have to force signing to start again */ srv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2); return NT_STATUS_OK; } /* handler for SPNEGO style session setup */ static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess) { NTSTATUS status = NT_STATUS_ACCESS_DENIED; struct smbsrv_session *smb_sess; struct gensec_security *gensec_ctx; struct auth_session_info *session_info = NULL; uint16_t vuid; sess->spnego.out.vuid = UID_FIELD_INVALID; 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->nt1.in.bufsize; req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities; } vuid = SVAL(req->in.hdr,HDR_UID); smb_sess = smbsrv_session_find_sesssetup(req->smb_conn, vuid); if (smb_sess) { gensec_ctx = smb_sess->gensec_ctx; status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob); } else { status = gensec_server_start(req, &gensec_ctx, req->smb_conn->connection->event.ctx); if (!NT_STATUS_IS_OK(status)) { DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status))); return status; } gensec_set_target_service(gensec_ctx, "cifs"); gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY); status = gensec_start_mech_by_oid(gensec_ctx, GENSEC_OID_SPNEGO); if (!NT_STATUS_IS_OK(status)) { DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status))); return status; } status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob); } if (NT_STATUS_IS_OK(status)) { DATA_BLOB session_key; status = gensec_session_info(gensec_ctx, &session_info); if (!NT_STATUS_IS_OK(status)) { talloc_free(smb_sess); return status; } status = gensec_session_key(gensec_ctx, &session_key); if (NT_STATUS_IS_OK(status) && session_info->server_info->authenticated && srv_setup_signing(req->smb_conn, &session_key, NULL)) { /* Force check of the request packet, now we know the session key */ req_signing_check_incoming(req); srv_signing_restart(req->smb_conn, &session_key, NULL); } } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { } else { status = auth_nt_status_squash(status); /* This invalidates the VUID of the failed login */ talloc_free(smb_sess); return status; } if (!smb_sess) { smb_sess = smbsrv_register_session(req->smb_conn, session_info, gensec_ctx); if (!smb_sess) { return NT_STATUS_ACCESS_DENIED; } req->session = smb_sess; talloc_steal(smb_sess, gensec_ctx); } else { smb_sess->session_info = talloc_reference(smb_sess, session_info); } if (NT_STATUS_IS_OK(status)) { /* Ensure this is marked as a 'real' vuid, not one * simply valid for the session setup leg */ smb_sess->finished_sesssetup = True; } sess->spnego.out.vuid = smb_sess->vuid; return status; } /* backend for sessionsetup call - this takes all 3 variants of the call */ NTSTATUS sesssetup_backend(struct smbsrv_request *req, union smb_sesssetup *sess) { NTSTATUS status = NT_STATUS_INVALID_LEVEL; switch (sess->old.level) { case RAW_SESSSETUP_OLD: status = sesssetup_old(req, sess); break; case RAW_SESSSETUP_NT1: status = sesssetup_nt1(req, sess); break; case RAW_SESSSETUP_SPNEGO: status = sesssetup_spnego(req, sess); break; } if (NT_STATUS_IS_OK(status)) { req->smb_conn->negotiate.done_sesssetup = True; } return status; }