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-rw-r--r--source4/librpc/rpc/dcerpc.c190
1 files changed, 77 insertions, 113 deletions
diff --git a/source4/librpc/rpc/dcerpc.c b/source4/librpc/rpc/dcerpc.c
index 28b5cd65a9..5bbcc5e91c 100644
--- a/source4/librpc/rpc/dcerpc.c
+++ b/source4/librpc/rpc/dcerpc.c
@@ -210,32 +210,6 @@ static NTSTATUS ncacn_pull(struct dcerpc_connection *c, DATA_BLOB *blob, TALLOC_
return NT_STATUS_OK;
}
-/*
- 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;
- }
- 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;
-}
-
/*
parse the authentication information on a dcerpc response packet
*/
@@ -249,9 +223,29 @@ static NTSTATUS ncacn_pull_request_auth(struct dcerpc_connection *c, TALLOC_CTX
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;
@@ -308,10 +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:
@@ -344,9 +336,24 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
enum ndr_err_code ndr_err;
/* non-signed packets are simpler */
- if (!c->security_state.auth_info ||
- !c->security_state.generic_state) {
- return ncacn_push_auth(blob, mem_ctx, c->iconv_convenience, pkt, c->security_state.auth_info);
+ if (sig_size == 0) {
+ return ncacn_push_auth(blob, mem_ctx, c->iconv_convenience, pkt, NULL);
+ }
+
+ 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);
@@ -372,39 +379,17 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
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, sig_size);
- 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 */
ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS, c->security_state.auth_info);
@@ -416,13 +401,14 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
/* 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) {
@@ -432,25 +418,11 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
blob->data + DCERPC_REQUEST_LENGTH,
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:
@@ -459,32 +431,11 @@ static NTSTATUS ncacn_push_request_sign(struct dcerpc_connection *c,
blob->data + DCERPC_REQUEST_LENGTH,
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:
@@ -492,7 +443,17 @@ 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;
}
@@ -1068,13 +1029,16 @@ static void dcerpc_ship_next_request(struct dcerpc_connection *c)
request header size */
chunk_size = p->conn->srv_max_recv_frag;
chunk_size -= DCERPC_REQUEST_LENGTH;
- if (c->security_state.generic_state) {
- chunk_size -= DCERPC_AUTH_TRAILER_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);
- 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);
pkt.ptype = DCERPC_PKT_REQUEST;
pkt.call_id = req->call_id;
generated by cgit (git 2.34.1) at 2024-12-26 14:14:56 +0000