libcli/auth Make the source3/ implementation of the NTLMSSP server common
[amitay/samba.git] / source3 / libsmb / ntlmssp.c
index d393404c1eabbf5e11e1e74700cea539a6b86cd2..6958a0dd1682670f40bbbb49bc95952bb0ea2fa8 100644 (file)
 static NTSTATUS ntlmssp_client_initial(struct ntlmssp_state *ntlmssp_state,
                                       TALLOC_CTX *out_mem_ctx, /* Unused at this time */
                                       DATA_BLOB reply, DATA_BLOB *next_request);
-static NTSTATUS ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
-                                        TALLOC_CTX *out_mem_ctx,
-                                        const DATA_BLOB in, DATA_BLOB *out);
 static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_state *ntlmssp_state,
                                         TALLOC_CTX *out_mem_ctx, /* Unused at this time */
                                         const DATA_BLOB reply, DATA_BLOB *next_request);
-static NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
-                                   TALLOC_CTX *out_mem_ctx,
-                                   const DATA_BLOB request, DATA_BLOB *reply);
-
 /**
  * Callbacks for NTLMSSP - for both client and server operating modes
  *
@@ -279,526 +272,6 @@ NTSTATUS ntlmssp_update(struct ntlmssp_state *ntlmssp_state,
        return NT_STATUS_INVALID_PARAMETER;
 }
 
-/**
- * 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.
- */
-
-static 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
- */
-
-static 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;
-}
-
 /**
  * Create an NTLMSSP state machine
  *