gensec: clarify memory ownership for gensec_session_info() and gensec_session_key()
[samba.git] / source4 / auth / ntlmssp / ntlmssp_server.c
index 8f7aa6e941cf25e9e12a52654892eabbe823026c..477972d1d40969caeb232dd905bc6ed845ab6a69 100644 (file)
 #include "system/network.h"
 #include "lib/tsocket/tsocket.h"
 #include "auth/ntlmssp/ntlmssp.h"
+#include "../librpc/gen_ndr/ndr_ntlmssp.h"
+#include "../libcli/auth/ntlmssp_ndr.h"
+#include "../libcli/auth/ntlmssp_private.h"
 #include "../libcli/auth/libcli_auth.h"
 #include "../lib/crypto/crypto.h"
 #include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_proto.h"
 #include "auth/auth.h"
 #include "param/param.h"
 
-/** 
- * Set a username on an NTLMSSP context - ensures it is talloc()ed 
- *
- */
-
-static NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
-{
-       if (!user) {
-               /* it should be at least "" */
-               DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
-               return NT_STATUS_INVALID_PARAMETER;
-       }
-       ntlmssp_state->user = talloc_strdup(ntlmssp_state, user);
-       if (!ntlmssp_state->user) {
-               return NT_STATUS_NO_MEMORY;
-       }
-       return NT_STATUS_OK;
-}
-
-/** 
- * Set a domain on an NTLMSSP context - ensures it is talloc()ed 
- *
- */
-static NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
-{
-       ntlmssp_state->domain = talloc_strdup(ntlmssp_state, domain);
-       if (!ntlmssp_state->domain) {
-               return NT_STATUS_NO_MEMORY;
-       }
-       return NT_STATUS_OK;
-}
-
-/** 
- * Set a workstation on an NTLMSSP context - ensures it is talloc()ed 
- *
- */
-static NTSTATUS ntlmssp_set_workstation(struct ntlmssp_state *ntlmssp_state, const char *workstation)
-{
-       ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
-       if (!ntlmssp_state->workstation) {
-               return NT_STATUS_NO_MEMORY;
-       }
-       return NT_STATUS_OK;
-}
-
-/**
- * Determine correct target name flags for reply, given server role 
- * and negotiated flags
- * 
- * @param ntlmssp_state NTLMSSP State
- * @param neg_flags The flags from the packet
- * @param chal_flags The flags to be set in the reply packet
- * @return The 'target name' string.
- */
-
-static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
-                                      uint32_t neg_flags, uint32_t *chal_flags) 
-{
-       if (neg_flags & NTLMSSP_REQUEST_TARGET) {
-               *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
-               *chal_flags |= NTLMSSP_REQUEST_TARGET;
-               if (ntlmssp_state->server.is_standalone) {
-                       *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
-                       return ntlmssp_state->server.netbios_name;
-               } else {
-                       *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
-                       return ntlmssp_state->server.netbios_domain;
-               };
-       } else {
-               return "";
-       }
-}
-
-
-
 /**
- * Next state function for the Negotiate packet
- * 
+ * Next state function for the Negotiate packet (GENSEC wrapper)
+ *
  * @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 MORE_PROCESSING_REQUIRED if (normal) a reply is required. 
+ * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  */
 
-NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security, 
-                                 TALLOC_CTX *out_mem_ctx, 
-                                 const DATA_BLOB in, DATA_BLOB *out) 
+NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
+                                        TALLOC_CTX *out_mem_ctx,
+                                        const DATA_BLOB request, DATA_BLOB *reply)
 {
        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;
-       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 (in.length) {
-               if ((in.length < 16) || !msrpc_parse(out_mem_ctx, 
-                                                        &in, "Cdd",
-                                                        "NTLMSSP",
-                                                        &ntlmssp_command,
-                                                        &neg_flags)) {
-                       DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
-                               "NTLMSSP Negotiate of length %u:\n",
-                               (unsigned int)in.length ));
-                       dump_data(2, in.data, in.length);
-                       return NT_STATUS_INVALID_PARAMETER;
-               }
-               debug_ntlmssp_flags(neg_flags);
-       }
-       
-       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(out_mem_ctx, 
-                         &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, 0);
-       }
-
-       {
-               /* Marshal the packet in the right format, be it unicode or ASCII */
-               const char *gen_string;
-               if (ntlmssp_state->unicode) {
-                       gen_string = "CdUdbddB";
-               } else {
-                       gen_string = "CdAdbddB";
-               }
-               
-               msrpc_gen(out_mem_ctx, 
-                         out, gen_string,
-                         "NTLMSSP", 
-                         NTLMSSP_CHALLENGE,
-                         target_name,
-                         chal_flags,
-                         cryptkey, 8,
-                         0, 0,
-                         struct_blob.data, struct_blob.length);
-       }
-               
-       ntlmssp_state->expected_state = NTLMSSP_AUTH;
-
-       return NT_STATUS_MORE_PROCESSING_REQUIRED;
+       return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply);
 }
 
-struct ntlmssp_server_auth_state {
-       DATA_BLOB user_session_key;
-       DATA_BLOB lm_session_key;
-};
-
 /**
- * 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;
-       char *domain = NULL;
-       char *user = NULL;
-       char *workstation = NULL;
-
-#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);
-       data_blob_free(&ntlmssp_state->encrypted_session_key);
-
-       ntlmssp_state->user = NULL;
-       ntlmssp_state->domain = NULL;
-       ntlmssp_state->workstation = 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,
-                        &domain, 
-                        &user, 
-                        &workstation,
-                        &ntlmssp_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(&ntlmssp_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,
-                                &domain, 
-                                &user, 
-                                &workstation)) {
-                       DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
-                       dump_data(2, request.data, request.length);
-
-                       return NT_STATUS_INVALID_PARAMETER;
-               }
-       }
-
-       if (auth_flags)
-               ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
-
-       if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
-               /* zero this out */
-               data_blob_free(&ntlmssp_state->encrypted_session_key);
-               return nt_status;
-       }
-
-       if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
-               /* zero this out */
-               data_blob_free(&ntlmssp_state->encrypted_session_key);
-               return nt_status;
-       }
-
-       if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
-               /* zero this out */
-               data_blob_free(&ntlmssp_state->encrypted_session_key);
-               return nt_status;
-       }
-
-       DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
-                ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (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;
-                       SMB_ASSERT(ntlmssp_state->internal_chal.data
-                                  && ntlmssp_state->internal_chal.length == 8);
-                       
-                       ntlmssp_state->doing_ntlm2 = true;
-
-                       memcpy(ntlmssp_state->crypt.ntlm2.session_nonce, ntlmssp_state->internal_chal.data, 8);
-                       memcpy(&ntlmssp_state->crypt.ntlm2.session_nonce[8], ntlmssp_state->lm_resp.data, 8);
-                       
-                       MD5Init(&md5_session_nonce_ctx);
-                       MD5Update(&md5_session_nonce_ctx, ntlmssp_state->crypt.ntlm2.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, zero it out */
-                       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))) {
-                               /* zero this out */
-                               data_blob_free(&ntlmssp_state->encrypted_session_key);
-                               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 gensec_security *gensec_security, 
-                                       struct ntlmssp_server_auth_state *state)
-{
-       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;
-       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);
-
-       if (!(gensec_security->want_features
-             & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY))) {
-               return NT_STATUS_OK;
-       }
-
-       if (user_session_key)
-               dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
-
-       if (lm_session_key) 
-               dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
-
-       /* Handle the different session key derivation for NTLM2 */
-       if (ntlmssp_state->doing_ntlm2) {
-               if (user_session_key && user_session_key->data && user_session_key->length == 16) {
-                       session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
-                       hmac_md5(user_session_key->data, ntlmssp_state->crypt.ntlm2.session_nonce,
-                                sizeof(ntlmssp_state->crypt.ntlm2.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, 0);
-               }
-       } 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 && 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);
-                               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"));
-                               dump_data_pw("LM session key:\n", session_key.data, session_key.length);
-                       } else {
-                               
-                               /* When there is no LM response, just use zeros */
-                               static const uint8_t zeros[24];
-                               session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
-                               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, 0);
-               }
-
-       } else if (user_session_key && user_session_key->data) {
-               session_key = data_blob_talloc(ntlmssp_state, user_session_key->data, user_session_key->length);
-               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 && lm_session_key->data) {
-               /* Very weird to have LM key, but no user session key, but anyway.. */
-               session_key = data_blob_talloc(ntlmssp_state, lm_session_key->data, lm_session_key->length);
-               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, 0);
-
-               /* 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 (!ntlmssp_state->encrypted_session_key.data
-                   || ntlmssp_state->encrypted_session_key.length != 16) {
-                       data_blob_free(&ntlmssp_state->encrypted_session_key);
-                       DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n", 
-                                 (unsigned)ntlmssp_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)session_key.length));
-                       ntlmssp_state->session_key = session_key;
-               } else {
-                       dump_data_pw("KEY_EXCH session key (enc):\n", 
-                                    ntlmssp_state->encrypted_session_key.data,
-                                    ntlmssp_state->encrypted_session_key.length);
-                       arcfour_crypt(ntlmssp_state->encrypted_session_key.data,
-                                     session_key.data, 
-                                     ntlmssp_state->encrypted_session_key.length);
-                       ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
-                                                                     ntlmssp_state->encrypted_session_key.data,
-                                                                     ntlmssp_state->encrypted_session_key.length);
-                       dump_data_pw("KEY_EXCH session key:\n", ntlmssp_state->encrypted_session_key.data,
-                                    ntlmssp_state->encrypted_session_key.length);
-                       talloc_free(session_key.data);
-               }
-       } else {
-               ntlmssp_state->session_key = session_key;
-       }
-
-       if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
-           || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
-               nt_status = ntlmssp_sign_init(ntlmssp_state);
-       } else {
-               nt_status = NT_STATUS_OK;
-       }
-
-       data_blob_free(&ntlmssp_state->encrypted_session_key);
-
-       ntlmssp_state->expected_state = NTLMSSP_DONE;
-
-       return nt_status;
-}
-
-
-/**
- * Next state function for the Authenticate packet
- * 
+ * Next state function for the Authenticate packet (GENSEC wrapper)
+ *
  * @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
@@ -535,55 +66,15 @@ static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
  * @return Errors or NT_STATUS_OK if authentication sucessful
  */
 
-NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security, 
-                            TALLOC_CTX *out_mem_ctx, 
-                            const DATA_BLOB in, DATA_BLOB *out) 
-{      
+NTSTATUS gensec_ntlmssp_server_auth(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;
-       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;
-       }
-
-       nt_status = ntlmssp_server_postauth(gensec_security, state);
-       if (!NT_STATUS_IS_OK(nt_status)) {
-               TALLOC_FREE(state);
-               return nt_status;
-       }
-
-       TALLOC_FREE(state);
-       return NT_STATUS_OK;
+       return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out);
 }
 
 /**
@@ -597,7 +88,7 @@ static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_s
        struct gensec_ntlmssp_context *gensec_ntlmssp =
                talloc_get_type_abort(ntlmssp_state->callback_private,
                                      struct gensec_ntlmssp_context);
-       struct auth_context *auth_context = gensec_ntlmssp->auth_context;
+       struct auth4_context *auth_context = gensec_ntlmssp->auth_context;
        NTSTATUS status;
 
        status = auth_context->get_challenge(auth_context, chal);
@@ -620,7 +111,7 @@ static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_s
        struct gensec_ntlmssp_context *gensec_ntlmssp =
                talloc_get_type_abort(ntlmssp_state->callback_private,
                                      struct gensec_ntlmssp_context);
-       struct auth_context *auth_context = gensec_ntlmssp->auth_context;
+       struct auth4_context *auth_context = gensec_ntlmssp->auth_context;
 
        return auth_context->challenge_may_be_modified(auth_context);
 }
@@ -634,7 +125,7 @@ static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state,
        struct gensec_ntlmssp_context *gensec_ntlmssp =
                talloc_get_type_abort(ntlmssp_state->callback_private,
                                      struct gensec_ntlmssp_context);
-       struct auth_context *auth_context = gensec_ntlmssp->auth_context;
+       struct auth4_context *auth_context = gensec_ntlmssp->auth_context;
        NTSTATUS nt_status;
        const uint8_t *chal;
 
@@ -658,16 +149,17 @@ static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state,
  */
 
 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
+                                           TALLOC_CTX *mem_ctx,
                                            DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 {
        struct gensec_ntlmssp_context *gensec_ntlmssp =
                talloc_get_type_abort(ntlmssp_state->callback_private,
                                      struct gensec_ntlmssp_context);
-       struct auth_context *auth_context = gensec_ntlmssp->auth_context;
+       struct auth4_context *auth_context = gensec_ntlmssp->auth_context;
        NTSTATUS nt_status;
        struct auth_usersupplied_info *user_info;
 
-       user_info = talloc(ntlmssp_state, struct auth_usersupplied_info);
+       user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
        if (!user_info) {
                return NT_STATUS_NO_MEMORY;
        }
@@ -677,7 +169,7 @@ static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
        user_info->mapped_state = false;
        user_info->client.account_name = ntlmssp_state->user;
        user_info->client.domain_name = ntlmssp_state->domain;
-       user_info->workstation_name = ntlmssp_state->workstation;
+       user_info->workstation_name = ntlmssp_state->client.netbios_name;
        user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 
        user_info->password_state = AUTH_PASSWORD_RESPONSE;
@@ -689,19 +181,23 @@ static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
        nt_status = auth_context->check_password(auth_context,
                                                 gensec_ntlmssp,
                                                 user_info,
-                                                &gensec_ntlmssp->server_info);
+                                                &gensec_ntlmssp->user_info_dc);
        talloc_free(user_info);
        NT_STATUS_NOT_OK_RETURN(nt_status);
 
-       if (gensec_ntlmssp->server_info->user_session_key.length) {
+       if (gensec_ntlmssp->user_info_dc->user_session_key.length) {
                DEBUG(10, ("Got NT session key of length %u\n",
-                          (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
-               *user_session_key = gensec_ntlmssp->server_info->user_session_key;
+                          (unsigned)gensec_ntlmssp->user_info_dc->user_session_key.length));
+               *user_session_key = gensec_ntlmssp->user_info_dc->user_session_key;
+               talloc_steal(mem_ctx, user_session_key->data);
+               gensec_ntlmssp->user_info_dc->user_session_key = data_blob_null;
        }
-       if (gensec_ntlmssp->server_info->lm_session_key.length) {
+       if (gensec_ntlmssp->user_info_dc->lm_session_key.length) {
                DEBUG(10, ("Got LM session key of length %u\n",
-                          (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
-               *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
+                          (unsigned)gensec_ntlmssp->user_info_dc->lm_session_key.length));
+               *lm_session_key = gensec_ntlmssp->user_info_dc->lm_session_key;
+               talloc_steal(mem_ctx, lm_session_key->data);
+               gensec_ntlmssp->user_info_dc->lm_session_key = data_blob_null;
        }
        return nt_status;
 }
@@ -717,6 +213,7 @@ static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
  */
 
 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
+                                    TALLOC_CTX *mem_ctx,
                                     struct auth_session_info **session_info) 
 {
        NTSTATUS nt_status;
@@ -725,18 +222,14 @@ NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
                                      struct gensec_ntlmssp_context);
        struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 
-       nt_status = auth_generate_session_info(ntlmssp_state,
-                                              gensec_security->event_ctx,
-                                              gensec_security->settings->lp_ctx,
-                                              gensec_ntlmssp->server_info,
-                                              session_info);
+       nt_status = gensec_generate_session_info(mem_ctx,
+                                                gensec_security,
+                                                gensec_ntlmssp->user_info_dc,
+                                                session_info);
        NT_STATUS_NOT_OK_RETURN(nt_status);
 
-       (*session_info)->session_key = data_blob_talloc(*session_info, 
-                                                       ntlmssp_state->session_key.data,
-                                                       ntlmssp_state->session_key.length);
-
-       return NT_STATUS_OK;
+       return gensec_ntlmssp_session_key(gensec_security, *session_info,
+                                         &(*session_info)->session_key);
 }
 
 /**
@@ -760,7 +253,7 @@ NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 
        ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 
-       ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
+       ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
                                          && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 
        ntlmssp_state->neg_flags =
@@ -768,7 +261,6 @@ NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 
        ntlmssp_state->lm_resp = data_blob(NULL, 0);
        ntlmssp_state->nt_resp = data_blob(NULL, 0);
-       ntlmssp_state->encrypted_session_key = data_blob(NULL, 0);
 
        if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
                ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
@@ -803,37 +295,37 @@ NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
        ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
        ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
        ntlmssp_state->check_password = auth_ntlmssp_check_password;
-       if (lp_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
+       if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
                ntlmssp_state->server.is_standalone = true;
        } else {
                ntlmssp_state->server.is_standalone = false;
        }
 
-       ntlmssp_state->server.netbios_name = lp_netbios_name(gensec_security->settings->lp_ctx);
+       ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 
-       ntlmssp_state->server.netbios_domain = lp_workgroup(gensec_security->settings->lp_ctx);
+       ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 
        {
-               char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
-
-               /* Find out the DNS domain name */
-               dnsdomname[0] = '\0';
-               safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
+               const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
+               char *dnsname, *lower_netbiosname;
+               lower_netbiosname = strlower_talloc(ntlmssp_state, ntlmssp_state->server.netbios_name);
 
                /* Find out the DNS host name */
-               safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
-               if (dnsdomname[0] != '\0') {
-                       safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
-                       safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
+               if (dnsdomain && dnsdomain[0] != '\0') {
+                       dnsname = talloc_asprintf(ntlmssp_state, "%s.%s",
+                                                 lower_netbiosname,
+                                                 dnsdomain);
+                       talloc_free(lower_netbiosname);
+                       ntlmssp_state->server.dns_name = dnsname;
+               } else {
+                       ntlmssp_state->server.dns_name = lower_netbiosname;
                }
-               strlower_m(dnsname);
 
-               ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
-                                                                     dnsname);
                NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 
-               ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
-                                                                       dnsdomname);
+               ntlmssp_state->server.dns_domain
+                       = talloc_strdup(ntlmssp_state,
+                                       lpcfg_dnsdomain(gensec_security->settings->lp_ctx));
                NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
        }