-/**
- * Next state function for the Negotiate packet
- *
- * @param ntlmssp_state NTLMSSP state
- * @param out_mem_ctx Memory context for *out
- * @param in The request, as a DATA_BLOB. reply.data must be NULL
- * @param out The reply, as an allocated DATA_BLOB, caller to free.
- * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
- */
-
-NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB request, DATA_BLOB *reply)
-{
- DATA_BLOB struct_blob;
- uint32_t neg_flags = 0;
- uint32_t ntlmssp_command, chal_flags;
- uint8_t cryptkey[8];
- const char *target_name;
- NTSTATUS status;
-
- /* parse the NTLMSSP packet */
-#if 0
- file_save("ntlmssp_negotiate.dat", request.data, request.length);
-#endif
-
- if (request.length) {
- if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
- "NTLMSSP",
- &ntlmssp_command,
- &neg_flags)) {
- DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
- (unsigned int)request.length));
- dump_data(2, request.data, request.length);
- return NT_STATUS_INVALID_PARAMETER;
- }
- debug_ntlmssp_flags(neg_flags);
-
- if (DEBUGLEVEL >= 10) {
- struct NEGOTIATE_MESSAGE *negotiate = talloc(
- ntlmssp_state, struct NEGOTIATE_MESSAGE);
- if (negotiate != NULL) {
- status = ntlmssp_pull_NEGOTIATE_MESSAGE(
- &request, negotiate, negotiate);
- if (NT_STATUS_IS_OK(status)) {
- NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
- negotiate);
- }
- TALLOC_FREE(negotiate);
- }
- }
- }
-
- ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
-
- /* Ask our caller what challenge they would like in the packet */
- status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
- nt_errstr(status)));
- return status;
- }
-
- /* Check if we may set the challenge */
- if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
- }
-
- /* The flags we send back are not just the negotiated flags,
- * they are also 'what is in this packet'. Therfore, we
- * operate on 'chal_flags' from here on
- */
-
- chal_flags = ntlmssp_state->neg_flags;
-
- /* get the right name to fill in as 'target' */
- target_name = ntlmssp_target_name(ntlmssp_state,
- neg_flags, &chal_flags);
- if (target_name == NULL)
- return NT_STATUS_INVALID_PARAMETER;
-
- ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
- ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
- cryptkey, 8);
-
- /* This creates the 'blob' of names that appears at the end of the packet */
- if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
- {
- msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
- MsvAvNbDomainName, target_name,
- MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
- MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
- MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
- MsvAvEOL, "");
- } else {
- struct_blob = data_blob_null;
- }
-
- {
- /* Marshal the packet in the right format, be it unicode or ASCII */
- const char *gen_string;
- DATA_BLOB version_blob = data_blob_null;
-
- if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
- enum ndr_err_code err;
- struct VERSION vers;
-
- /* "What Windows returns" as a version number. */
- ZERO_STRUCT(vers);
- vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
- vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
- vers.ProductBuild = 0;
- vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
-
- err = ndr_push_struct_blob(&version_blob,
- ntlmssp_state,
- &vers,
- (ndr_push_flags_fn_t)ndr_push_VERSION);
-
- if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
- data_blob_free(&struct_blob);
- return NT_STATUS_NO_MEMORY;
- }
- }
-
- if (ntlmssp_state->unicode) {
- gen_string = "CdUdbddBb";
- } else {
- gen_string = "CdAdbddBb";
- }
-
- msrpc_gen(out_mem_ctx, reply, gen_string,
- "NTLMSSP",
- NTLMSSP_CHALLENGE,
- target_name,
- chal_flags,
- cryptkey, 8,
- 0, 0,
- struct_blob.data, struct_blob.length,
- version_blob.data, version_blob.length);
-
- data_blob_free(&version_blob);
-
- if (DEBUGLEVEL >= 10) {
- struct CHALLENGE_MESSAGE *challenge = talloc(
- ntlmssp_state, struct CHALLENGE_MESSAGE);
- if (challenge != NULL) {
- challenge->NegotiateFlags = chal_flags;
- status = ntlmssp_pull_CHALLENGE_MESSAGE(
- reply, challenge, challenge);
- if (NT_STATUS_IS_OK(status)) {
- NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
- challenge);
- }
- TALLOC_FREE(challenge);
- }
- }
- }
-
- data_blob_free(&struct_blob);
-
- ntlmssp_state->expected_state = NTLMSSP_AUTH;
-
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
-}
-
-struct ntlmssp_server_auth_state {
- DATA_BLOB user_session_key;
- DATA_BLOB lm_session_key;
- /* internal variables used by KEY_EXCH (client-supplied user session key */
- DATA_BLOB encrypted_session_key;
- bool doing_ntlm2;
- /* internal variables used by NTLM2 */
- uint8_t session_nonce[16];
-};
-
-/**
- * Next state function for the Authenticate packet
- *
- * @param ntlmssp_state NTLMSSP State
- * @param request The request, as a DATA_BLOB
- * @return Errors or NT_STATUS_OK.
- */
-
-static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
- struct ntlmssp_server_auth_state *state,
- const DATA_BLOB request)
-{
- uint32_t ntlmssp_command, auth_flags;
- NTSTATUS nt_status;
-
- uint8_t session_nonce_hash[16];
-
- const char *parse_string;
-
-#if 0
- file_save("ntlmssp_auth.dat", request.data, request.length);
-#endif
-
- if (ntlmssp_state->unicode) {
- parse_string = "CdBBUUUBd";
- } else {
- parse_string = "CdBBAAABd";
- }
-
- /* zero these out */
- data_blob_free(&ntlmssp_state->session_key);
- data_blob_free(&ntlmssp_state->lm_resp);
- data_blob_free(&ntlmssp_state->nt_resp);
-
- ntlmssp_state->user = NULL;
- ntlmssp_state->domain = NULL;
- ntlmssp_state->client.netbios_name = NULL;
-
- /* now the NTLMSSP encoded auth hashes */
- if (!msrpc_parse(ntlmssp_state, &request, parse_string,
- "NTLMSSP",
- &ntlmssp_command,
- &ntlmssp_state->lm_resp,
- &ntlmssp_state->nt_resp,
- &ntlmssp_state->domain,
- &ntlmssp_state->user,
- &ntlmssp_state->client.netbios_name,
- &state->encrypted_session_key,
- &auth_flags)) {
- DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
- dump_data(10, request.data, request.length);
-
- /* zero this out */
- data_blob_free(&state->encrypted_session_key);
- auth_flags = 0;
-
- /* Try again with a shorter string (Win9X truncates this packet) */
- if (ntlmssp_state->unicode) {
- parse_string = "CdBBUUU";
- } else {
- parse_string = "CdBBAAA";
- }
-
- /* now the NTLMSSP encoded auth hashes */
- if (!msrpc_parse(ntlmssp_state, &request, parse_string,
- "NTLMSSP",
- &ntlmssp_command,
- &ntlmssp_state->lm_resp,
- &ntlmssp_state->nt_resp,
- &ntlmssp_state->domain,
- &ntlmssp_state->user,
- &ntlmssp_state->client.netbios_name)) {
- DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
- dump_data(2, request.data, request.length);
-
- return NT_STATUS_INVALID_PARAMETER;
- }
- }
-
- talloc_steal(state, state->encrypted_session_key.data);
-
- if (auth_flags)
- ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
-
- if (DEBUGLEVEL >= 10) {
- struct AUTHENTICATE_MESSAGE *authenticate = talloc(
- ntlmssp_state, struct AUTHENTICATE_MESSAGE);
- if (authenticate != NULL) {
- NTSTATUS status;
- authenticate->NegotiateFlags = auth_flags;
- status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
- &request, authenticate, authenticate);
- if (NT_STATUS_IS_OK(status)) {
- NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
- authenticate);
- }
- TALLOC_FREE(authenticate);
- }
- }
-
- DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
- ntlmssp_state->user, ntlmssp_state->domain,
- ntlmssp_state->client.netbios_name,
- (unsigned long)ntlmssp_state->lm_resp.length,
- (unsigned long)ntlmssp_state->nt_resp.length));
-
-#if 0
- file_save("nthash1.dat", &ntlmssp_state->nt_resp.data, &ntlmssp_state->nt_resp.length);
- file_save("lmhash1.dat", &ntlmssp_state->lm_resp.data, &ntlmssp_state->lm_resp.length);
-#endif
-
- /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
- client challenge
-
- However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
- */
- if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
- if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
- struct MD5Context md5_session_nonce_ctx;
- state->doing_ntlm2 = true;
-
- memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
- memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
-
- SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
-
- MD5Init(&md5_session_nonce_ctx);
- MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
- MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
-
- ntlmssp_state->chal = data_blob_talloc(
- ntlmssp_state, session_nonce_hash, 8);
-
- /* LM response is no longer useful */
- data_blob_free(&ntlmssp_state->lm_resp);
-
- /* We changed the effective challenge - set it */
- if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
- return nt_status;
- }
-
- /* LM Key is incompatible. */
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
- }
- }
- return NT_STATUS_OK;
-}
-
-/**
- * Next state function for the Authenticate packet
- * (after authentication - figures out the session keys etc)
- *
- * @param ntlmssp_state NTLMSSP State
- * @return Errors or NT_STATUS_OK.
- */
-
-static NTSTATUS ntlmssp_server_postauth(struct ntlmssp_state *ntlmssp_state,
- struct ntlmssp_server_auth_state *state)
-{
- DATA_BLOB user_session_key = state->user_session_key;
- DATA_BLOB lm_session_key = state->lm_session_key;
- NTSTATUS nt_status;
- DATA_BLOB session_key = data_blob(NULL, 0);
-
- dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
- dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
-
- /* Handle the different session key derivation for NTLM2 */
- if (state->doing_ntlm2) {
- if (user_session_key.data && user_session_key.length == 16) {
- session_key = data_blob_talloc(ntlmssp_state,
- NULL, 16);
- hmac_md5(user_session_key.data, state->session_nonce,
- sizeof(state->session_nonce), session_key.data);
- DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
- dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
-
- } else {
- DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
- session_key = data_blob_null;
- }
- } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
- /* Ensure we can never get here on NTLMv2 */
- && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
-
- if (lm_session_key.data && lm_session_key.length >= 8) {
- if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
- session_key = data_blob_talloc(ntlmssp_state,
- NULL, 16);
- if (session_key.data == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
- SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
- session_key.data);
- DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
- } else {
- static const uint8_t zeros[24] = {0, };
- session_key = data_blob_talloc(
- ntlmssp_state, NULL, 16);
- if (session_key.data == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
- SMBsesskeygen_lm_sess_key(zeros, zeros,
- session_key.data);
- DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
- }
- dump_data_pw("LM session key:\n", session_key.data,
- session_key.length);
- } else {
- /* LM Key not selected */
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
-
- DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
- session_key = data_blob_null;
- }
-
- } else if (user_session_key.data) {
- session_key = user_session_key;
- DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
- dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
-
- /* LM Key not selected */
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
-
- } else if (lm_session_key.data) {
- /* Very weird to have LM key, but no user session key, but anyway.. */
- session_key = lm_session_key;
- DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
- dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
-
- /* LM Key not selected */
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
-
- } else {
- DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
- session_key = data_blob_null;
-
- /* LM Key not selected */
- ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
- }
-
- /* With KEY_EXCH, the client supplies the proposed session key,
- but encrypts it with the long-term key */
- if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
- if (!state->encrypted_session_key.data
- || state->encrypted_session_key.length != 16) {
- data_blob_free(&state->encrypted_session_key);
- DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
- (unsigned)state->encrypted_session_key.length));
- return NT_STATUS_INVALID_PARAMETER;
- } else if (!session_key.data || session_key.length != 16) {
- DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
- (unsigned int)session_key.length));
- ntlmssp_state->session_key = session_key;
- } else {
- dump_data_pw("KEY_EXCH session key (enc):\n",
- state->encrypted_session_key.data,
- state->encrypted_session_key.length);
- arcfour_crypt(state->encrypted_session_key.data,
- session_key.data,
- state->encrypted_session_key.length);
- ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
- state->encrypted_session_key.data,
- state->encrypted_session_key.length);
- dump_data_pw("KEY_EXCH session key:\n",
- state->encrypted_session_key.data,
- state->encrypted_session_key.length);
- talloc_free(session_key.data);
- }
- } else {
- ntlmssp_state->session_key = session_key;
- }
-
- if (ntlmssp_state->session_key.length) {
- nt_status = ntlmssp_sign_init(ntlmssp_state);
- }
-
- ntlmssp_state->expected_state = NTLMSSP_DONE;
-
- return nt_status;
-}
-
-
-/**
- * Next state function for the Authenticate packet
- *
- * @param gensec_security GENSEC state
- * @param out_mem_ctx Memory context for *out
- * @param in The request, as a DATA_BLOB. reply.data must be NULL
- * @param out The reply, as an allocated DATA_BLOB, caller to free.
- * @return Errors or NT_STATUS_OK if authentication sucessful
- */
-
-NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB in, DATA_BLOB *out)
-{
- struct ntlmssp_server_auth_state *state;
- NTSTATUS nt_status;
-
- /* zero the outbound NTLMSSP packet */
- *out = data_blob_null;
-
- state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state);
- if (state == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
-
- nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in);
- if (!NT_STATUS_IS_OK(nt_status)) {
- TALLOC_FREE(state);
- return nt_status;
- }
-
- /*
- * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
- * is required (by "ntlm auth = no" and "lm auth = no" being set in the
- * smb.conf file) and no NTLMv2 response was sent then the password check
- * will fail here. JRA.
- */
-
- /* Finally, actually ask if the password is OK */
- nt_status = ntlmssp_state->check_password(ntlmssp_state,
- &state->user_session_key,
- &state->lm_session_key);
- if (!NT_STATUS_IS_OK(nt_status)) {
- TALLOC_FREE(state);
- return nt_status;
- }
-
- /* When we get more async in the auth code behind
- ntlmssp_state->check_password, the ntlmssp_server_postpath
- can be done in a callback */
-
- nt_status = ntlmssp_server_postauth(ntlmssp_state, state);
- if (!NT_STATUS_IS_OK(nt_status)) {
- TALLOC_FREE(state);
- return nt_status;
- }
-
- TALLOC_FREE(state);
- return NT_STATUS_OK;
-}
-
git.samba.org / amitay / samba.git / blobdiff