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-rw-r--r--source4/rpc_server/dcerpc_server.c11
-rw-r--r--source4/rpc_server/dcesrv_auth.c158
2 files changed, 80 insertions, 89 deletions
diff --git a/source4/rpc_server/dcerpc_server.c b/source4/rpc_server/dcerpc_server.c
index fa7b8d26f5..e5f59d0cf9 100644
--- a/source4/rpc_server/dcerpc_server.c
+++ b/source4/rpc_server/dcerpc_server.c
@@ -951,13 +951,16 @@ _PUBLIC_ NTSTATUS dcesrv_reply(struct dcesrv_call_state *call)
request header size */
chunk_size = call->conn->cli_max_recv_frag;
chunk_size -= DCERPC_REQUEST_LENGTH;
- if (call->conn->auth_state.gensec_security) {
- chunk_size -= DCERPC_AUTH_TRAILER_LENGTH;
+ if (call->conn->auth_state.auth_info &&
+ call->conn->auth_state.gensec_security) {
sig_size = gensec_sig_size(call->conn->auth_state.gensec_security,
call->conn->cli_max_recv_frag);
- chunk_size -= sig_size;
- chunk_size -= (chunk_size % 16);
+ if (sig_size) {
+ chunk_size -= DCERPC_AUTH_TRAILER_LENGTH;
+ chunk_size -= sig_size;
+ }
}
+ chunk_size -= (chunk_size % 16);
do {
uint32_t length;
diff --git a/source4/rpc_server/dcesrv_auth.c b/source4/rpc_server/dcesrv_auth.c
index 3a7f2420b3..16bf4eb7ed 100644
--- a/source4/rpc_server/dcesrv_auth.c
+++ b/source4/rpc_server/dcesrv_auth.c
@@ -276,33 +276,6 @@ NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_pack
}
/*
- generate a CONNECT level verifier
-*/
-static NTSTATUS dcesrv_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;
- }
- SIVAL(blob->data, 0, 1);
- memset(blob->data+4, 0, 12);
- return NT_STATUS_OK;
-}
-
-/*
- generate a CONNECT level verifier
-*/
-static NTSTATUS dcesrv_check_connect_verifier(DATA_BLOB *blob)
-{
- if (blob->length != 16 ||
- IVAL(blob->data, 0) != 1) {
- return NT_STATUS_ACCESS_DENIED;
- }
- return NT_STATUS_OK;
-}
-
-
-/*
check credentials on a request
*/
bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
@@ -320,6 +293,26 @@ bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
return true;
}
+ switch (dce_conn->auth_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 true;
+ case DCERPC_AUTH_LEVEL_NONE:
+ if (pkt->auth_length != 0) {
+ return false;
+ }
+ return true;
+
+ default:
+ return false;
+ }
+
auth_blob.length = 8 + pkt->auth_length;
/* check for a valid length */
@@ -374,7 +367,8 @@ bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
break;
case DCERPC_AUTH_LEVEL_CONNECT:
- status = dcesrv_check_connect_verifier(&auth.credentials);
+ /* for now we ignore possible signatures here */
+ status = NT_STATUS_OK;
break;
default:
@@ -409,9 +403,30 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
DATA_BLOB creds2;
/* non-signed packets are simple */
- if (!dce_conn->auth_state.auth_info || !dce_conn->auth_state.gensec_security) {
+ if (sig_size == 0) {
+ status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
+ return NT_STATUS_IS_OK(status);
+ }
+
+ switch (dce_conn->auth_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
+ * that might be needed for schannel...
+ */
status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
return NT_STATUS_IS_OK(status);
+
+ case DCERPC_AUTH_LEVEL_NONE:
+ status = ncacn_push_auth(blob, call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx), pkt, NULL);
+ return NT_STATUS_IS_OK(status);
+
+ default:
+ return false;
}
ndr = ndr_push_init_ctx(call, lp_iconv_convenience(dce_conn->dce_ctx->lp_ctx));
@@ -439,21 +454,8 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
payload_length = pkt->u.response.stub_and_verifier.length +
dce_conn->auth_state.auth_info->auth_pad_length;
- if (dce_conn->auth_state.auth_info->auth_level == DCERPC_AUTH_LEVEL_CONNECT) {
- status = dcesrv_connect_verifier(call,
- &dce_conn->auth_state.auth_info->credentials);
- if (!NT_STATUS_IS_OK(status)) {
- return false;
- }
- } else {
-
- /* We hope this length is accruate. If must be if the
- * GENSEC mech does AEAD signing of the packet
- * headers */
- dce_conn->auth_state.auth_info->credentials
- = data_blob_talloc(call, NULL, sig_size);
- data_blob_clear(&dce_conn->auth_state.auth_info->credentials);
- }
+ /* we start without signature, it will appended later */
+ dce_conn->auth_state.auth_info->credentials = data_blob(NULL, 0);
/* add the auth verifier */
ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
@@ -465,14 +467,14 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
/* 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, dce_conn->auth_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 (dce_conn->auth_state.auth_info->auth_level) {
@@ -482,22 +484,8 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
ndr->data + DCERPC_REQUEST_LENGTH,
payload_length,
blob->data,
- blob->length - dce_conn->auth_state.auth_info->credentials.length,
+ blob->length,
&creds2);
-
- if (NT_STATUS_IS_OK(status)) {
- blob->length -= dce_conn->auth_state.auth_info->credentials.length;
- if (!data_blob_append(call, blob, creds2.data, creds2.length))
- status = NT_STATUS_NO_MEMORY;
- else
- status = NT_STATUS_OK;
- }
-
- /* If we did AEAD signing of the packet headers, then we hope
- * this value didn't change... */
- dcerpc_set_auth_length(blob, creds2.length);
- dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
- data_blob_free(&creds2);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
@@ -506,24 +494,8 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
ndr->data + DCERPC_REQUEST_LENGTH,
payload_length,
blob->data,
- blob->length - dce_conn->auth_state.auth_info->credentials.length,
+ blob->length,
&creds2);
- if (NT_STATUS_IS_OK(status)) {
- blob->length -= dce_conn->auth_state.auth_info->credentials.length;
- if (!data_blob_append(call, blob, creds2.data, creds2.length))
- status = NT_STATUS_NO_MEMORY;
- else
- status = NT_STATUS_OK;
- }
-
- /* If we did AEAD signing of the packet headers, then we hope
- * this value didn't change... */
- dcerpc_set_auth_length(blob, creds2.length);
- dcerpc_set_frag_length(blob, dcerpc_get_frag_length(blob)+creds2.length);
- data_blob_free(&creds2);
- break;
-
- case DCERPC_AUTH_LEVEL_CONNECT:
break;
default:
@@ -531,7 +503,23 @@ bool dcesrv_auth_response(struct dcesrv_call_state *call,
break;
}
- data_blob_free(&dce_conn->auth_state.auth_info->credentials);
+ if (NT_STATUS_IS_OK(status)) {
+ 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,
+ dce_conn->auth_state.auth_info->auth_pad_length,
+ pkt->u.response.stub_and_verifier.length));
+ data_blob_free(&creds2);
+ status = NT_STATUS_INTERNAL_ERROR;
+ }
+ }
+
+ if (NT_STATUS_IS_OK(status)) {
+ if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
+ status = NT_STATUS_NO_MEMORY;
+ }
+ data_blob_free(&creds2);
+ }
if (!NT_STATUS_IS_OK(status)) {
return false;
generated by cgit (git 2.34.1) at 2024-12-25 03:03:52 +0000