s4:librpc/rpc: correctly sign or seal rpc request with an object guid
[kai/samba.git] / source4 / librpc / rpc / dcerpc.c
index 9d58fafcb86dae6e2e96b0d99636b13e42a2a9bd..c1e3e26ee988be9107fe0e4d1ccf7573ca76f8cd 100644 (file)
 #include "lib/util/dlinklist.h"
 #include "lib/events/events.h"
 #include "librpc/rpc/dcerpc.h"
+#include "librpc/rpc/dcerpc_proto.h"
 #include "librpc/gen_ndr/ndr_misc.h"
 #include "librpc/gen_ndr/ndr_dcerpc.h"
 #include "libcli/composite/composite.h"
 #include "auth/gensec/gensec.h"
+#include "param/param.h"
 
-NTSTATUS dcerpc_init(void)
+_PUBLIC_ NTSTATUS dcerpc_init(void)
 {
-       gensec_init();
+       gensec_init(global_loadparm);
 
        return NT_STATUS_OK;
 }
@@ -55,7 +57,8 @@ static int dcerpc_connection_destructor(struct dcerpc_connection *conn)
    the event context is optional
 */
 static struct dcerpc_connection *dcerpc_connection_init(TALLOC_CTX *mem_ctx, 
-                                                struct event_context *ev)
+                                                struct event_context *ev,
+                                                struct smb_iconv_convenience *ic)
 {
        struct dcerpc_connection *c;
 
@@ -64,20 +67,15 @@ static struct dcerpc_connection *dcerpc_connection_init(TALLOC_CTX *mem_ctx,
                return NULL;
        }
 
-       if (ev == NULL) {
-               ev = event_context_init(c);
-               if (ev == NULL) {
-                       talloc_free(c);
-                       return NULL;
-               }
-       }
+       c->iconv_convenience = talloc_reference(c, ic);
 
-       c->event_ctx = ev;
-       
-       if (!talloc_reference(c, ev)) {
+       c->event_ctx = talloc_reference(c, ev);
+
+       if (c->event_ctx == NULL) {
                talloc_free(c);
                return NULL;
        }
+
        c->call_id = 1;
        c->security_state.auth_info = NULL;
        c->security_state.session_key = dcerpc_generic_session_key;
@@ -94,7 +92,8 @@ static struct dcerpc_connection *dcerpc_connection_init(TALLOC_CTX *mem_ctx,
 }
 
 /* initialise a dcerpc pipe. */
-struct dcerpc_pipe *dcerpc_pipe_init(TALLOC_CTX *mem_ctx, struct event_context *ev)
+_PUBLIC_ struct dcerpc_pipe *dcerpc_pipe_init(TALLOC_CTX *mem_ctx, struct event_context *ev,
+                                    struct smb_iconv_convenience *ic)
 {
        struct dcerpc_pipe *p;
 
@@ -103,7 +102,7 @@ struct dcerpc_pipe *dcerpc_pipe_init(TALLOC_CTX *mem_ctx, struct event_context *
                return NULL;
        }
 
-       p->conn = dcerpc_connection_init(p, ev);
+       p->conn = dcerpc_connection_init(p, ev, ic);
        if (p->conn == NULL) {
                talloc_free(p);
                return NULL;
@@ -163,13 +162,13 @@ void dcerpc_set_auth_length(DATA_BLOB *blob, uint16_t v)
 }
 
 
-/*
+/**
   setup for a ndr pull, also setting up any flags from the binding string
 */
 static struct ndr_pull *ndr_pull_init_flags(struct dcerpc_connection *c, 
                                            DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
 {
-       struct ndr_pull *ndr = ndr_pull_init_blob(blob, mem_ctx);
+       struct ndr_pull *ndr = ndr_pull_init_blob(blob, mem_ctx, c->iconv_convenience);
 
        if (ndr == NULL) return ndr;
 
@@ -192,6 +191,7 @@ static NTSTATUS ncacn_pull(struct dcerpc_connection *c, DATA_BLOB *blob, TALLOC_
                            struct ncacn_packet *pkt)
 {
        struct ndr_pull *ndr;
+       enum ndr_err_code ndr_err;
 
        ndr = ndr_pull_init_flags(c, blob, mem_ctx);
        if (!ndr) {
@@ -202,32 +202,11 @@ static NTSTATUS ncacn_pull(struct dcerpc_connection *c, DATA_BLOB *blob, TALLOC_
                ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
        }
 
-       return ndr_pull_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
-}
-
-/*
-  generate a CONNECT level verifier
-*/
-static NTSTATUS dcerpc_connect_verifier(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
-{
-       *blob = data_blob_talloc(mem_ctx, NULL, 16);
-       if (blob->data == NULL) {
-               return NT_STATUS_NO_MEMORY;
+       ndr_err = ndr_pull_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               return ndr_map_error2ntstatus(ndr_err);
        }
-       SIVAL(blob->data, 0, 1);
-       memset(blob->data+4, 0, 12);
-       return NT_STATUS_OK;
-}
 
-/*
-  check a CONNECT level verifier
-*/
-static NTSTATUS dcerpc_check_connect_verifier(DATA_BLOB *blob)
-{
-       if (blob->length != 16 ||
-           IVAL(blob->data, 0) != 1) {
-               return NT_STATUS_ACCESS_DENIED;
-       }
        return NT_STATUS_OK;
 }
 
@@ -242,12 +221,33 @@ static NTSTATUS ncacn_pull_request_auth(struct dcerpc_connection *c, TALLOC_CTX
        NTSTATUS status;
        struct dcerpc_auth auth;
        DATA_BLOB auth_blob;
+       enum ndr_err_code ndr_err;
 
-       if (pkt->auth_length == 0 &&
-           c->security_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
+       if (!c->security_state.auth_info ||
+           !c->security_state.generic_state) {
                return NT_STATUS_OK;
        }
 
+       switch (c->security_state.auth_info->auth_level) {
+       case DCERPC_AUTH_LEVEL_PRIVACY:
+       case DCERPC_AUTH_LEVEL_INTEGRITY:
+               break;
+
+       case DCERPC_AUTH_LEVEL_CONNECT:
+               if (pkt->auth_length != 0) {
+                       break;
+               }
+               return NT_STATUS_OK;
+       case DCERPC_AUTH_LEVEL_NONE:
+               if (pkt->auth_length != 0) {
+                       return NT_STATUS_INVALID_NETWORK_RESPONSE;
+               }
+               return NT_STATUS_OK;
+
+       default:
+               return NT_STATUS_INVALID_LEVEL;
+       }
+
        auth_blob.length = 8 + pkt->auth_length;
 
        /* check for a valid length */
@@ -270,11 +270,12 @@ static NTSTATUS ncacn_pull_request_auth(struct dcerpc_connection *c, TALLOC_CTX
                ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
        }
 
-       status = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
-       if (!NT_STATUS_IS_OK(status)) {
-               return status;
+       ndr_err = ndr_pull_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, &auth);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               return ndr_map_error2ntstatus(ndr_err);
        }
-       
+       status = NT_STATUS_OK;
+
        /* check signature or unseal the packet */
        switch (c->security_state.auth_info->auth_level) {
        case DCERPC_AUTH_LEVEL_PRIVACY:
@@ -301,10 +302,8 @@ static NTSTATUS ncacn_pull_request_auth(struct dcerpc_connection *c, TALLOC_CTX
                break;
 
        case DCERPC_AUTH_LEVEL_CONNECT:
-               status = dcerpc_check_connect_verifier(&auth.credentials);
-               break;
-
-       case DCERPC_AUTH_LEVEL_NONE:
+               /* for now we ignore possible signatures here */
+               status = NT_STATUS_OK;
                break;
 
        default:
@@ -327,20 +326,38 @@ static NTSTATUS ncacn_pull_request_auth(struct dcerpc_connection *c, TALLOC_CTX
 */
 static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c, 
                                         DATA_BLOB *blob, TALLOC_CTX *mem_ctx, 
+                                        size_t sig_size,
                                         struct ncacn_packet *pkt)
 {
        NTSTATUS status;
        struct ndr_push *ndr;
        DATA_BLOB creds2;
        size_t payload_length;
+       enum ndr_err_code ndr_err;
+       size_t hdr_size = DCERPC_REQUEST_LENGTH;
 
        /* non-signed packets are simpler */
-       if (!c->security_state.auth_info || 
-           !c->security_state.generic_state) {
-               return ncacn_push_auth(blob, mem_ctx, pkt, c->security_state.auth_info);
+       if (sig_size == 0) {
+               return ncacn_push_auth(blob, mem_ctx, c->iconv_convenience, pkt, NULL);
        }
 
-       ndr = ndr_push_init_ctx(mem_ctx);
+       switch (c->security_state.auth_info->auth_level) {
+       case DCERPC_AUTH_LEVEL_PRIVACY:
+       case DCERPC_AUTH_LEVEL_INTEGRITY:
+               break;
+
+       case DCERPC_AUTH_LEVEL_CONNECT:
+               /* TODO: let the gensec mech decide if it wants to generate a signature */
+               return ncacn_push_auth(blob, mem_ctx, c->iconv_convenience, pkt, NULL);
+
+       case DCERPC_AUTH_LEVEL_NONE:
+               return ncacn_push_auth(blob, mem_ctx, c->iconv_convenience, pkt, NULL);
+
+       default:
+               return NT_STATUS_INVALID_LEVEL;
+       }
+
+       ndr = ndr_push_init_ctx(mem_ctx, c->iconv_convenience);
        if (!ndr) {
                return NT_STATUS_NO_MEMORY;
        }
@@ -351,130 +368,76 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
 
        if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
                ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
+               hdr_size += 16;
        }
 
-       status = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
-       if (!NT_STATUS_IS_OK(status)) {
-               return status;
+       ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               return ndr_map_error2ntstatus(ndr_err);
        }
+       status = NT_STATUS_OK;
 
        /* pad to 16 byte multiple in the payload portion of the
           packet. This matches what w2k3 does */
        c->security_state.auth_info->auth_pad_length = 
                (16 - (pkt->u.request.stub_and_verifier.length & 15)) & 15;
-       ndr_push_zero(ndr, c->security_state.auth_info->auth_pad_length);
+       ndr_err = ndr_push_zero(ndr, c->security_state.auth_info->auth_pad_length);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               return ndr_map_error2ntstatus(ndr_err);
+       }
+       status = NT_STATUS_OK;
 
        payload_length = pkt->u.request.stub_and_verifier.length + 
                c->security_state.auth_info->auth_pad_length;
 
-       /* sign or seal the packet */
-       switch (c->security_state.auth_info->auth_level) {
-       case DCERPC_AUTH_LEVEL_PRIVACY:
-       case DCERPC_AUTH_LEVEL_INTEGRITY:
-               /* We hope this length is accruate.  If must be if the
-                * GENSEC mech does AEAD signing of the packet
-                * headers */
-               c->security_state.auth_info->credentials
-                       = data_blob_talloc(mem_ctx, NULL, gensec_sig_size(c->security_state.generic_state, 
-                                                                         payload_length));
-               data_blob_clear(&c->security_state.auth_info->credentials);
-               break;
-
-       case DCERPC_AUTH_LEVEL_CONNECT:
-               status = dcerpc_connect_verifier(mem_ctx, &c->security_state.auth_info->credentials);
-               break;
-               
-       case DCERPC_AUTH_LEVEL_NONE:
-               c->security_state.auth_info->credentials = data_blob(NULL, 0);
-               break;
-               
-       default:
-               status = NT_STATUS_INVALID_LEVEL;
-               break;
-       }
-       
-       if (!NT_STATUS_IS_OK(status)) {
-               return status;
-       }       
+       /* we start without signature, it will appended later */
+       c->security_state.auth_info->credentials = data_blob(NULL,0);
 
        /* add the auth verifier */
-       status = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, c->security_state.auth_info);
-       if (!NT_STATUS_IS_OK(status)) {
-               return status;
+       ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, c->security_state.auth_info);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               return ndr_map_error2ntstatus(ndr_err);
        }
+       status = NT_STATUS_OK;
 
        /* extract the whole packet as a blob */
        *blob = ndr_push_blob(ndr);
 
-       /* fill in the fragment length and auth_length, we can't fill
-          in these earlier as we don't know the signature length (it
-          could be variable length) */
-       dcerpc_set_frag_length(blob, blob->length);
-       /* We hope this value is accruate.  If must be if the GENSEC
-        * mech does AEAD signing of the packet headers */
-       dcerpc_set_auth_length(blob, c->security_state.auth_info->credentials.length);
+       /*
+        * Setup the frag and auth length in the packet buffer.
+        * This is needed if the GENSEC mech does AEAD signing
+        * of the packet headers. The signature itself will be
+        * appended later.
+        */
+       dcerpc_set_frag_length(blob, blob->length + sig_size);
+       dcerpc_set_auth_length(blob, sig_size);
 
        /* sign or seal the packet */
        switch (c->security_state.auth_info->auth_level) {
        case DCERPC_AUTH_LEVEL_PRIVACY:
                status = gensec_seal_packet(c->security_state.generic_state, 
                                            mem_ctx, 
-                                           blob->data + DCERPC_REQUEST_LENGTH, 
+                                           blob->data + hdr_size,
                                            payload_length,
                                            blob->data,
-                                           blob->length - 
-                                           c->security_state.auth_info->credentials.length,
+                                           blob->length,
                                            &creds2);
                if (!NT_STATUS_IS_OK(status)) {
                        return status;
                }
-               blob->length -= c->security_state.auth_info->credentials.length;
-               if (!data_blob_append(mem_ctx, blob,
-                                         creds2.data, creds2.length)) {
-                       return NT_STATUS_NO_MEMORY;
-               }
-               dcerpc_set_auth_length(blob, creds2.length);
-               if (c->security_state.auth_info->credentials.length == 0) {
-                       /* this is needed for krb5 only, to correct the total packet
-                          length */
-                       dcerpc_set_frag_length(blob, 
-                                              dcerpc_get_frag_length(blob)
-                                              +creds2.length);
-               }
                break;
 
        case DCERPC_AUTH_LEVEL_INTEGRITY:
                status = gensec_sign_packet(c->security_state.generic_state, 
                                            mem_ctx, 
-                                           blob->data + DCERPC_REQUEST_LENGTH, 
+                                           blob->data + hdr_size,
                                            payload_length, 
                                            blob->data,
-                                           blob->length - 
-                                           c->security_state.auth_info->credentials.length,
+                                           blob->length,
                                            &creds2);
                if (!NT_STATUS_IS_OK(status)) {
                        return status;
                }
-               blob->length -= c->security_state.auth_info->credentials.length;
-               if (!data_blob_append(mem_ctx, blob,
-                                         creds2.data, creds2.length)) {
-                       return NT_STATUS_NO_MEMORY;
-               }
-               dcerpc_set_auth_length(blob, creds2.length);
-               if (c->security_state.auth_info->credentials.length == 0) {
-                       /* this is needed for krb5 only, to correct the total packet
-                          length */
-                       dcerpc_set_frag_length(blob, 
-                                              dcerpc_get_frag_length(blob)
-                                              +creds2.length);
-               }
-               break;
-
-       case DCERPC_AUTH_LEVEL_CONNECT:
-               break;
-
-       case DCERPC_AUTH_LEVEL_NONE:
-               c->security_state.auth_info->credentials = data_blob(NULL, 0);
                break;
 
        default:
@@ -482,7 +445,17 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
                break;
        }
 
-       data_blob_free(&c->security_state.auth_info->credentials);
+       if (creds2.length != sig_size) {
+               DEBUG(0,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
+                       creds2.length, (uint32_t)sig_size,
+                       c->security_state.auth_info->auth_pad_length,
+                       pkt->u.request.stub_and_verifier.length));
+               return NT_STATUS_INTERNAL_ERROR;
+       }
+
+       if (!data_blob_append(mem_ctx, blob, creds2.data, creds2.length)) {
+               return NT_STATUS_NO_MEMORY;
+       }
 
        return NT_STATUS_OK;
 }
@@ -648,14 +621,29 @@ static void dcerpc_bind_recv_handler(struct rpc_request *req,
        conn->srv_max_xmit_frag = pkt->u.bind_ack.max_xmit_frag;
        conn->srv_max_recv_frag = pkt->u.bind_ack.max_recv_frag;
 
+       if ((req->p->binding->flags & DCERPC_CONCURRENT_MULTIPLEX) &&
+           (pkt->pfc_flags & DCERPC_PFC_FLAG_CONC_MPX)) {
+               conn->flags |= DCERPC_CONCURRENT_MULTIPLEX;
+       }
+
+       if ((req->p->binding->flags & DCERPC_HEADER_SIGNING) &&
+           (pkt->pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN)) {
+               conn->flags |= DCERPC_HEADER_SIGNING;
+       }
+
        /* the bind_ack might contain a reply set of credentials */
        if (conn->security_state.auth_info &&
            pkt->u.bind_ack.auth_info.length) {
-               c->status = ndr_pull_struct_blob(
+               enum ndr_err_code ndr_err;
+               ndr_err = ndr_pull_struct_blob(
                        &pkt->u.bind_ack.auth_info, conn,
+                       NULL,
                        conn->security_state.auth_info,
                        (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
-               if (!composite_is_ok(c)) return;
+               if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+                       c->status = ndr_map_error2ntstatus(ndr_err);
+                       if (!composite_is_ok(c)) return;
+               }
        }
 
        req->p->assoc_group_id = pkt->u.bind_ack.assoc_group_id;
@@ -716,6 +704,10 @@ struct composite_context *dcerpc_bind_send(struct dcerpc_pipe *p,
                pkt.pfc_flags |= DCERPC_PFC_FLAG_CONC_MPX;
        }
 
+       if (p->binding->flags & DCERPC_HEADER_SIGNING) {
+               pkt.pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
+       }
+
        pkt.u.bind.max_xmit_frag = 5840;
        pkt.u.bind.max_recv_frag = 5840;
        pkt.u.bind.assoc_group_id = p->binding->assoc_group_id;
@@ -729,7 +721,7 @@ struct composite_context *dcerpc_bind_send(struct dcerpc_pipe *p,
        pkt.u.bind.auth_info = data_blob(NULL, 0);
 
        /* construct the NDR form of the packet */
-       c->status = ncacn_push_auth(&blob, c, &pkt,
+       c->status = ncacn_push_auth(&blob, c, p->conn->iconv_convenience, &pkt,
                                    p->conn->security_state.auth_info);
        if (!composite_is_ok(c)) return c;
 
@@ -775,30 +767,41 @@ NTSTATUS dcerpc_bind_recv(struct composite_context *ctx)
 /* 
    perform a continued bind (and auth3)
 */
-NTSTATUS dcerpc_auth3(struct dcerpc_connection *c, 
+NTSTATUS dcerpc_auth3(struct dcerpc_pipe *p,
                      TALLOC_CTX *mem_ctx)
 {
        struct ncacn_packet pkt;
        NTSTATUS status;
        DATA_BLOB blob;
 
-       init_ncacn_hdr(c, &pkt);
+       init_ncacn_hdr(p->conn, &pkt);
 
        pkt.ptype = DCERPC_PKT_AUTH3;
        pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST;
-       pkt.call_id = next_call_id(c);
+       pkt.call_id = next_call_id(p->conn);
        pkt.auth_length = 0;
        pkt.u.auth3._pad = 0;
        pkt.u.auth3.auth_info = data_blob(NULL, 0);
 
+       if (p->binding->flags & DCERPC_CONCURRENT_MULTIPLEX) {
+               pkt.pfc_flags |= DCERPC_PFC_FLAG_CONC_MPX;
+       }
+
+       if (p->binding->flags & DCERPC_HEADER_SIGNING) {
+               pkt.pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
+       }
+
        /* construct the NDR form of the packet */
-       status = ncacn_push_auth(&blob, mem_ctx, &pkt, c->security_state.auth_info);
+       status = ncacn_push_auth(&blob, mem_ctx,
+                                p->conn->iconv_convenience,
+                                &pkt,
+                                p->conn->security_state.auth_info);
        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }
 
        /* send it on its way */
-       status = c->transport.send_request(c, &blob, false);
+       status = p->conn->transport.send_request(p->conn, &blob, false);
        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }
@@ -1002,6 +1005,7 @@ static void dcerpc_ship_next_request(struct dcerpc_connection *c)
        DATA_BLOB blob;
        uint32_t remaining, chunk_size;
        bool first_packet = true;
+       size_t sig_size = 0;
 
        req = c->request_queue;
        if (req == NULL) {
@@ -1025,7 +1029,18 @@ static void dcerpc_ship_next_request(struct dcerpc_connection *c)
 
        /* we can write a full max_recv_frag size, minus the dcerpc
           request header size */
-       chunk_size = p->conn->srv_max_recv_frag - (DCERPC_MAX_SIGN_SIZE+DCERPC_REQUEST_LENGTH);
+       chunk_size = p->conn->srv_max_recv_frag;
+       chunk_size -= DCERPC_REQUEST_LENGTH;
+       if (c->security_state.auth_info &&
+           c->security_state.generic_state) {
+               sig_size = gensec_sig_size(c->security_state.generic_state,
+                                          p->conn->srv_max_recv_frag);
+               if (sig_size) {
+                       chunk_size -= DCERPC_AUTH_TRAILER_LENGTH;
+                       chunk_size -= sig_size;
+               }
+       }
+       chunk_size -= (chunk_size % 16);
 
        pkt.ptype = DCERPC_PKT_REQUEST;
        pkt.call_id = req->call_id;
@@ -1061,7 +1076,7 @@ static void dcerpc_ship_next_request(struct dcerpc_connection *c)
                        (stub_data->length - remaining);
                pkt.u.request.stub_and_verifier.length = chunk;
 
-               req->status = ncacn_push_request_sign(p->conn, &blob, req, &pkt);
+               req->status = ncacn_push_request_sign(p->conn, &blob, req, sig_size, &pkt);
                if (!NT_STATUS_IS_OK(req->status)) {
                        req->state = RPC_REQUEST_DONE;
                        DLIST_REMOVE(p->conn->pending, req);
@@ -1083,7 +1098,7 @@ static void dcerpc_ship_next_request(struct dcerpc_connection *c)
   return the event context for a dcerpc pipe
   used by callers who wish to operate asynchronously
 */
-struct event_context *dcerpc_event_context(struct dcerpc_pipe *p)
+_PUBLIC_ struct event_context *dcerpc_event_context(struct dcerpc_pipe *p)
 {
        return p->conn->event_ctx;
 }
@@ -1155,8 +1170,8 @@ static NTSTATUS dcerpc_ndr_validate_in(struct dcerpc_connection *c,
        void *st;
        struct ndr_pull *pull;
        struct ndr_push *push;
-       NTSTATUS status;
        DATA_BLOB blob2;
+       enum ndr_err_code ndr_err;
 
        st = talloc_size(mem_ctx, struct_size);
        if (!st) {
@@ -1169,23 +1184,27 @@ static NTSTATUS dcerpc_ndr_validate_in(struct dcerpc_connection *c,
        }
        pull->flags |= LIBNDR_FLAG_REF_ALLOC;
 
-       status = ndr_pull(pull, NDR_IN, st);
-       if (!NT_STATUS_IS_OK(status)) {
-               return ndr_pull_error(pull, NDR_ERR_VALIDATE, 
-                                     "failed input validation pull - %s",
-                                     nt_errstr(status));
+       ndr_err = ndr_pull(pull, NDR_IN, st);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
+               ndr_err = ndr_pull_error(pull, NDR_ERR_VALIDATE,
+                                        "failed input validation pull - %s",
+                                        nt_errstr(status));
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
-       push = ndr_push_init_ctx(mem_ctx);
+       push = ndr_push_init_ctx(mem_ctx, c->iconv_convenience);
        if (!push) {
                return NT_STATUS_NO_MEMORY;
        }       
 
-       status = ndr_push(push, NDR_IN, st);
-       if (!NT_STATUS_IS_OK(status)) {
-               return ndr_push_error(push, NDR_ERR_VALIDATE, 
-                                     "failed input validation push - %s",
-                                     nt_errstr(status));
+       ndr_err = ndr_push(push, NDR_IN, st);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
+               ndr_err = ndr_pull_error(pull, NDR_ERR_VALIDATE,
+                                        "failed input validation push - %s",
+                                        nt_errstr(status));
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        blob2 = ndr_push_blob(push);
@@ -1195,9 +1214,9 @@ static NTSTATUS dcerpc_ndr_validate_in(struct dcerpc_connection *c,
                dump_data(3, blob.data, blob.length);
                DEBUG(3,("secondary:\n"));
                dump_data(3, blob2.data, blob2.length);
-               return ndr_push_error(push, NDR_ERR_VALIDATE, 
-                                     "failed input validation data - %s",
-                                     nt_errstr(status));
+               ndr_err = ndr_pull_error(pull, NDR_ERR_VALIDATE,
+                                        "failed input validation blobs doesn't match");
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        return NT_STATUS_OK;
@@ -1221,10 +1240,10 @@ static NTSTATUS dcerpc_ndr_validate_out(struct dcerpc_connection *c,
        void *st;
        struct ndr_pull *pull;
        struct ndr_push *push;
-       NTSTATUS status;
        DATA_BLOB blob, blob2;
        TALLOC_CTX *mem_ctx = pull_in;
        char *s1, *s2;
+       enum ndr_err_code ndr_err;
 
        st = talloc_size(mem_ctx, struct_size);
        if (!st) {
@@ -1232,16 +1251,18 @@ static NTSTATUS dcerpc_ndr_validate_out(struct dcerpc_connection *c,
        }
        memcpy(st, struct_ptr, struct_size);
 
-       push = ndr_push_init_ctx(mem_ctx);
+       push = ndr_push_init_ctx(mem_ctx, c->iconv_convenience);
        if (!push) {
                return NT_STATUS_NO_MEMORY;
        }       
 
-       status = ndr_push(push, NDR_OUT, struct_ptr);
-       if (!NT_STATUS_IS_OK(status)) {
-               return ndr_push_error(push, NDR_ERR_VALIDATE, 
-                                     "failed output validation push - %s",
-                                     nt_errstr(status));
+       ndr_err = ndr_push(push, NDR_OUT, struct_ptr);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
+               ndr_err = ndr_push_error(push, NDR_ERR_VALIDATE,
+                                        "failed output validation push - %s",
+                                        nt_errstr(status));
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        blob = ndr_push_blob(push);
@@ -1252,23 +1273,27 @@ static NTSTATUS dcerpc_ndr_validate_out(struct dcerpc_connection *c,
        }
 
        pull->flags |= LIBNDR_FLAG_REF_ALLOC;
-       status = ndr_pull(pull, NDR_OUT, st);
-       if (!NT_STATUS_IS_OK(status)) {
-               return ndr_pull_error(pull, NDR_ERR_VALIDATE, 
-                                     "failed output validation pull - %s",
-                                     nt_errstr(status));
+       ndr_err = ndr_pull(pull, NDR_OUT, st);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
+               ndr_err = ndr_pull_error(pull, NDR_ERR_VALIDATE,
+                                        "failed output validation pull - %s",
+                                        nt_errstr(status));
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
-       push = ndr_push_init_ctx(mem_ctx);
+       push = ndr_push_init_ctx(mem_ctx, c->iconv_convenience);
        if (!push) {
                return NT_STATUS_NO_MEMORY;
        }       
 
-       status = ndr_push(push, NDR_OUT, st);
-       if (!NT_STATUS_IS_OK(status)) {
-               return ndr_push_error(push, NDR_ERR_VALIDATE, 
-                                     "failed output validation push2 - %s",
-                                     nt_errstr(status));
+       ndr_err = ndr_push(push, NDR_OUT, st);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
+               ndr_err = ndr_push_error(push, NDR_ERR_VALIDATE,
+                                        "failed output validation push2 - %s",
+                                        nt_errstr(status));
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        blob2 = ndr_push_blob(push);
@@ -1278,9 +1303,9 @@ static NTSTATUS dcerpc_ndr_validate_out(struct dcerpc_connection *c,
                dump_data(3, blob.data, blob.length);
                DEBUG(3,("secondary:\n"));
                dump_data(3, blob2.data, blob2.length);
-               return ndr_push_error(push, NDR_ERR_VALIDATE, 
-                                     "failed output validation data - %s",
-                                     nt_errstr(status));
+               ndr_err = ndr_push_error(push, NDR_ERR_VALIDATE,
+                                        "failed output validation blobs doesn't match");
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        /* this checks the printed forms of the two structures, which effectively
@@ -1299,15 +1324,16 @@ static NTSTATUS dcerpc_ndr_validate_out(struct dcerpc_connection *c,
                file_save("gen.dat", s2, strlen(s2));
                system("diff -u wire.dat gen.dat");
 #endif
-               return ndr_push_error(push, NDR_ERR_VALIDATE,
-                                     "failed output validation strings doesn't match");
+               ndr_err = ndr_push_error(push, NDR_ERR_VALIDATE,
+                                        "failed output validation strings doesn't match");
+               return ndr_map_error2ntstatus(ndr_err);
        }
 
        return NT_STATUS_OK;
 }
 
 
-/*
+/**
  send a rpc request given a dcerpc_call structure 
  */
 struct rpc_request *dcerpc_ndr_request_send(struct dcerpc_pipe *p,
@@ -1322,11 +1348,12 @@ struct rpc_request *dcerpc_ndr_request_send(struct dcerpc_pipe *p,
        NTSTATUS status;
        DATA_BLOB request;
        struct rpc_request *req;
+       enum ndr_err_code ndr_err;
 
        call = &table->calls[opnum];
 
        /* setup for a ndr_push_* call */
-       push = ndr_push_init_ctx(mem_ctx);
+       push = ndr_push_init_ctx(mem_ctx, p->conn->iconv_convenience);
        if (!push) {
                return NULL;
        }
@@ -1336,8 +1363,9 @@ struct rpc_request *dcerpc_ndr_request_send(struct dcerpc_pipe *p,
        }
 
        /* push the structure into a blob */
-       status = call->ndr_push(push, NDR_IN, r);
-       if (!NT_STATUS_IS_OK(status)) {
+       ndr_err = call->ndr_push(push, NDR_IN, r);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               status = ndr_map_error2ntstatus(ndr_err);
                DEBUG(2,("Unable to ndr_push structure in dcerpc_ndr_request_send - %s\n",
                         nt_errstr(status)));
                talloc_free(push);
@@ -1392,6 +1420,7 @@ _PUBLIC_ NTSTATUS dcerpc_ndr_request_recv(struct rpc_request *req)
        uint32_t opnum = req->ndr.opnum;
        const struct ndr_interface_table *table = req->ndr.table;
        const struct ndr_interface_call *call = &table->calls[opnum];
+       enum ndr_err_code ndr_err;
 
        /* make sure the recv code doesn't free the request, as we
           need to grab the flags element before it is freed */
@@ -1427,8 +1456,9 @@ _PUBLIC_ NTSTATUS dcerpc_ndr_request_recv(struct rpc_request *req)
        dump_data(10, pull->data, pull->data_size);
 
        /* pull the structure from the blob */
-       status = call->ndr_pull(pull, NDR_OUT, r);
-       if (!NT_STATUS_IS_OK(status)) {
+       ndr_err = call->ndr_pull(pull, NDR_OUT, r);
+       if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+               status = ndr_map_error2ntstatus(ndr_err);
                dcerpc_log_packet(table, opnum, NDR_OUT, 
                                  &response);
                return status;
@@ -1467,7 +1497,7 @@ _PUBLIC_ NTSTATUS dcerpc_ndr_request_recv(struct rpc_request *req)
   this can be used when you have ndr push/pull functions in the
   standard format
 */
-NTSTATUS dcerpc_ndr_request(struct dcerpc_pipe *p,
+_PUBLIC_ NTSTATUS dcerpc_ndr_request(struct dcerpc_pipe *p,
                            const struct GUID *object,
                            const struct ndr_interface_table *table,
                            uint32_t opnum, 
@@ -1488,12 +1518,15 @@ NTSTATUS dcerpc_ndr_request(struct dcerpc_pipe *p,
 /*
   a useful function for retrieving the server name we connected to
 */
-const char *dcerpc_server_name(struct dcerpc_pipe *p)
+_PUBLIC_ const char *dcerpc_server_name(struct dcerpc_pipe *p)
 {
-       if (!p->conn->transport.peer_name) {
-               return "";
+       if (!p->conn->transport.target_hostname) {
+               if (!p->conn->transport.peer_name) {
+                       return "";
+               }
+               return p->conn->transport.peer_name(p->conn);
        }
-       return p->conn->transport.peer_name(p->conn);
+       return p->conn->transport.target_hostname(p->conn);
 }
 
 
@@ -1547,11 +1580,16 @@ static void dcerpc_alter_recv_handler(struct rpc_request *req,
        /* the alter_resp might contain a reply set of credentials */
        if (recv_pipe->conn->security_state.auth_info &&
            pkt->u.alter_resp.auth_info.length) {
-               c->status = ndr_pull_struct_blob(
+               enum ndr_err_code ndr_err;
+               ndr_err = ndr_pull_struct_blob(
                        &pkt->u.alter_resp.auth_info, recv_pipe,
+                       NULL,
                        recv_pipe->conn->security_state.auth_info,
                        (ndr_pull_flags_fn_t)ndr_pull_dcerpc_auth);
-               if (!composite_is_ok(c)) return;
+               if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+                       c->status = ndr_map_error2ntstatus(ndr_err);
+                       if (!composite_is_ok(c)) return;
+               }
        }
 
        composite_done(c);
@@ -1589,6 +1627,10 @@ struct composite_context *dcerpc_alter_context_send(struct dcerpc_pipe *p,
                pkt.pfc_flags |= DCERPC_PFC_FLAG_CONC_MPX;
        }
 
+       if (p->binding->flags & DCERPC_HEADER_SIGNING) {
+               pkt.pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
+       }
+
        pkt.u.alter.max_xmit_frag = 5840;
        pkt.u.alter.max_recv_frag = 5840;
        pkt.u.alter.assoc_group_id = p->binding->assoc_group_id;
@@ -1602,7 +1644,7 @@ struct composite_context *dcerpc_alter_context_send(struct dcerpc_pipe *p,
        pkt.u.alter.auth_info = data_blob(NULL, 0);
 
        /* construct the NDR form of the packet */
-       c->status = ncacn_push_auth(&blob, mem_ctx, &pkt,
+       c->status = ncacn_push_auth(&blob, mem_ctx, p->conn->iconv_convenience, &pkt,
                                    p->conn->security_state.auth_info);
        if (!composite_is_ok(c)) return c;
 
@@ -1644,7 +1686,7 @@ NTSTATUS dcerpc_alter_context_recv(struct composite_context *ctx)
 /* 
    send a dcerpc alter_context request
 */
-NTSTATUS dcerpc_alter_context(struct dcerpc_pipe *p, 
+_PUBLIC_ NTSTATUS dcerpc_alter_context(struct dcerpc_pipe *p, 
                              TALLOC_CTX *mem_ctx,
                              const struct ndr_syntax_id *syntax,
                              const struct ndr_syntax_id *transfer_syntax)