/* Unix SMB/Netbios implementation. Version 3.0 handle NLTMSSP, client server side parsing Copyright (C) Andrew Tridgell 2001 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005 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/>. */ struct auth_session_info; #include "includes.h" #include "auth/ntlmssp/ntlmssp.h" #include "../lib/crypto/crypto.h" #include "../libcli/auth/libcli_auth.h" #include "auth/credentials/credentials.h" #include "auth/gensec/gensec.h" #include "param/param.h" #include "auth/ntlmssp/ntlmssp_private.h" #include "../librpc/gen_ndr/ndr_ntlmssp.h" #include "../auth/ntlmssp/ntlmssp_ndr.h" /********************************************************************* Client side NTLMSSP *********************************************************************/ /** * Next state function for the Initial packet * * @param ntlmssp_state NTLMSSP State * @param out_mem_ctx The DATA_BLOB *out will be allocated on this context * @param in A NULL data blob (input ignored) * @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx * @return Errors or NT_STATUS_OK. */ NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, DATA_BLOB in, DATA_BLOB *out) { struct gensec_ntlmssp_context *gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data, struct gensec_ntlmssp_context); struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; const char *domain = ntlmssp_state->client.netbios_domain; const char *workstation = ntlmssp_state->client.netbios_name; NTSTATUS status; /* These don't really matter in the initial packet, so don't panic if they are not set */ if (!domain) { domain = ""; } if (!workstation) { workstation = ""; } if (ntlmssp_state->unicode) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE; } else { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM; } if (ntlmssp_state->use_ntlmv2) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2; } /* generate the ntlmssp negotiate packet */ status = msrpc_gen(out_mem_ctx, out, "CddAA", "NTLMSSP", NTLMSSP_NEGOTIATE, ntlmssp_state->neg_flags, domain, workstation); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("ntlmssp_client_initial: failed to generate " "ntlmssp negotiate packet\n")); return status; } if (DEBUGLEVEL >= 10) { struct NEGOTIATE_MESSAGE *negotiate = talloc( ntlmssp_state, struct NEGOTIATE_MESSAGE); if (negotiate != NULL) { status = ntlmssp_pull_NEGOTIATE_MESSAGE( out, negotiate, negotiate); if (NT_STATUS_IS_OK(status)) { NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE, negotiate); } TALLOC_FREE(negotiate); } } ntlmssp_state->expected_state = NTLMSSP_CHALLENGE; return NT_STATUS_MORE_PROCESSING_REQUIRED; } /** * Next state function for the Challenge Packet. Generate an auth packet. * * @param gensec_security GENSEC state * @param out_mem_ctx Memory context for *out * @param in The server challnege, as a DATA_BLOB. reply.data must be NULL * @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context * @return Errors or NT_STATUS_OK. */ NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, const DATA_BLOB in, DATA_BLOB *out) { struct gensec_ntlmssp_context *gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data, struct gensec_ntlmssp_context); struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state; uint32_t chal_flags, ntlmssp_command, unkn1, unkn2; DATA_BLOB server_domain_blob; DATA_BLOB challenge_blob; DATA_BLOB target_info = data_blob(NULL, 0); char *server_domain; const char *chal_parse_string; const char *auth_gen_string; DATA_BLOB lm_response = data_blob(NULL, 0); DATA_BLOB nt_response = data_blob(NULL, 0); DATA_BLOB session_key = data_blob(NULL, 0); DATA_BLOB lm_session_key = data_blob(NULL, 0); DATA_BLOB encrypted_session_key = data_blob(NULL, 0); NTSTATUS nt_status; int flags = 0; const char *user, *domain; TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx); if (!mem_ctx) { return NT_STATUS_NO_MEMORY; } if (!msrpc_parse(mem_ctx, &in, "CdBd", "NTLMSSP", &ntlmssp_command, &server_domain_blob, &chal_flags)) { DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n")); dump_data(2, in.data, in.length); talloc_free(mem_ctx); return NT_STATUS_INVALID_PARAMETER; } data_blob_free(&server_domain_blob); DEBUG(3, ("Got challenge flags:\n")); debug_ntlmssp_flags(chal_flags); ntlmssp_handle_neg_flags(ntlmssp_state, chal_flags, ntlmssp_state->allow_lm_key); if (ntlmssp_state->unicode) { if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) { chal_parse_string = "CdUdbddB"; } else { chal_parse_string = "CdUdbdd"; } auth_gen_string = "CdBBUUUBd"; } else { if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) { chal_parse_string = "CdAdbddB"; } else { chal_parse_string = "CdAdbdd"; } auth_gen_string = "CdBBAAABd"; } if (!msrpc_parse(mem_ctx, &in, chal_parse_string, "NTLMSSP", &ntlmssp_command, &server_domain, &chal_flags, &challenge_blob, 8, &unkn1, &unkn2, &target_info)) { DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n")); dump_data(2, in.data, in.length); talloc_free(mem_ctx); return NT_STATUS_INVALID_PARAMETER; } if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) { ntlmssp_state->server.is_standalone = true; } else { ntlmssp_state->server.is_standalone = false; } /* TODO: parse struct_blob and fill in the rest */ ntlmssp_state->server.netbios_name = ""; ntlmssp_state->server.netbios_domain = server_domain; ntlmssp_state->server.dns_name = ""; ntlmssp_state->server.dns_domain = ""; if (challenge_blob.length != 8) { talloc_free(mem_ctx); return NT_STATUS_INVALID_PARAMETER; } cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx, &user, &domain); if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) { flags |= CLI_CRED_NTLM2; } if (ntlmssp_state->use_ntlmv2) { flags |= CLI_CRED_NTLMv2_AUTH; } if (ntlmssp_state->use_nt_response) { flags |= CLI_CRED_NTLM_AUTH; } if (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx)) { flags |= CLI_CRED_LANMAN_AUTH; } nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx, &flags, challenge_blob, target_info, &lm_response, &nt_response, &lm_session_key, &session_key); if (!NT_STATUS_IS_OK(nt_status)) { return nt_status; } if (!(flags & CLI_CRED_LANMAN_AUTH)) { /* LM Key is still possible, just silly, so we do not * allow it. Fortunetly all LM crypto is off by * default and we require command line options to end * up here */ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY; } if (!(flags & CLI_CRED_NTLM2)) { /* NTLM2 is incompatible... */ ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2; } if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && lm_session_key.length == 16) { DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16); if (lm_response.length == 24) { SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data, new_session_key.data); } else { static const uint8_t zeros[24]; SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros, new_session_key.data); } session_key = new_session_key; dump_data_pw("LM session key\n", session_key.data, session_key.length); } /* Key exchange encryptes a new client-generated session key with the password-derived key */ if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) { /* Make up a new session key */ uint8_t client_session_key[16]; generate_secret_buffer(client_session_key, sizeof(client_session_key)); /* Encrypt the new session key with the old one */ encrypted_session_key = data_blob_talloc(ntlmssp_state, client_session_key, sizeof(client_session_key)); dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length); arcfour_crypt(encrypted_session_key.data, session_key.data, encrypted_session_key.length); dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length); /* Mark the new session key as the 'real' session key */ session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key)); } DEBUG(3, ("NTLMSSP: Set final flags:\n")); debug_ntlmssp_flags(ntlmssp_state->neg_flags); /* this generates the actual auth packet */ nt_status = msrpc_gen(mem_ctx, out, auth_gen_string, "NTLMSSP", NTLMSSP_AUTH, lm_response.data, lm_response.length, nt_response.data, nt_response.length, domain, user, cli_credentials_get_workstation(gensec_security->credentials), encrypted_session_key.data, encrypted_session_key.length, ntlmssp_state->neg_flags); if (!NT_STATUS_IS_OK(nt_status)) { talloc_free(mem_ctx); return nt_status; } ntlmssp_state->session_key = session_key; talloc_steal(ntlmssp_state, session_key.data); talloc_steal(out_mem_ctx, out->data); ntlmssp_state->expected_state = NTLMSSP_DONE; if (gensec_security->want_features & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL)) { nt_status = ntlmssp_sign_init(ntlmssp_state); if (!NT_STATUS_IS_OK(nt_status)) { DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n", nt_errstr(nt_status))); talloc_free(mem_ctx); return nt_status; } } talloc_free(mem_ctx); return NT_STATUS_OK; } NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security) { struct gensec_ntlmssp_context *gensec_ntlmssp; struct ntlmssp_state *ntlmssp_state; NTSTATUS nt_status; nt_status = gensec_ntlmssp_start(gensec_security); NT_STATUS_NOT_OK_RETURN(nt_status); gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data, struct gensec_ntlmssp_context); ntlmssp_state = talloc_zero(gensec_ntlmssp, struct ntlmssp_state); if (!ntlmssp_state) { return NT_STATUS_NO_MEMORY; } gensec_ntlmssp->ntlmssp_state = ntlmssp_state; ntlmssp_state = gensec_ntlmssp->ntlmssp_state; ntlmssp_state->role = NTLMSSP_CLIENT; ntlmssp_state->client.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx); ntlmssp_state->client.netbios_name = cli_credentials_get_workstation(gensec_security->credentials); ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true); ntlmssp_state->use_nt_response = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "send_nt_reponse", true); ntlmssp_state->allow_lm_key = (lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx) && (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false) || gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false))); ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx); ntlmssp_state->expected_state = NTLMSSP_INITIAL; ntlmssp_state->neg_flags = NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_REQUEST_TARGET; if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128; } if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56; } if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY; } if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH; } if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; } if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2; } else { /* apparently we can't do ntlmv2 if we don't do ntlm2 */ ntlmssp_state->use_ntlmv2 = false; } if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) { /* * We need to set this to allow a later SetPassword * via the SAMR pipe to succeed. Strange.... We could * also add NTLMSSP_NEGOTIATE_SEAL here. JRA. * * Without this, Windows will not create the master key * that it thinks is only used for NTLMSSP signing and * sealing. (It is actually pulled out and used directly) */ ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; } if (gensec_security->want_features & GENSEC_FEATURE_SIGN) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; } if (gensec_security->want_features & GENSEC_FEATURE_SEAL) { ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN; ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL; } return NT_STATUS_OK; }