/*
push a dcerpc request packet into a blob, possibly signing it.
*/
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 (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);
if (!ndr) {
return NT_STATUS_NO_MEMORY;
}
if (c->flags & DCERPC_PUSH_BIGENDIAN) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
if (c->flags & DCERPC_NDR64) {
ndr->flags |= LIBNDR_FLAG_NDR64;
}
if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
ndr->flags |= LIBNDR_FLAG_OBJECT_PRESENT;
hdr_size += 16;
}
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_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;
/* 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);
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);
/*
* 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 + hdr_size,
payload_length,
blob->data,
blob->length,
&creds2);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = gensec_sign_packet(c->security_state.generic_state,
mem_ctx,
blob->data + hdr_size,
payload_length,
blob->data,
blob->length,
&creds2);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
break;
default:
status = NT_STATUS_INVALID_LEVEL;
break;
}
if (creds2.length != sig_size) {
DEBUG(0,("ncacn_push_request_sign: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
(unsigned) creds2.length,
(unsigned) sig_size,
(unsigned) c->security_state.auth_info->auth_pad_length,
(unsigned) 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;
}
/*
push a signed or sealed dcerpc request packet into a blob
*/
bool dcesrv_auth_response(struct dcesrv_call_state *call,
DATA_BLOB *blob, size_t sig_size,
struct ncacn_packet *pkt)
{
struct dcesrv_connection *dce_conn = call->conn;
NTSTATUS status;
enum ndr_err_code ndr_err;
struct ndr_push *ndr;
uint32_t payload_length;
DATA_BLOB creds2;
/* non-signed packets are simple */
if (sig_size == 0) {
status = ncacn_push_auth(blob, call, 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, pkt, NULL);
return NT_STATUS_IS_OK(status);
case DCERPC_AUTH_LEVEL_NONE:
status = ncacn_push_auth(blob, call, pkt, NULL);
return NT_STATUS_IS_OK(status);
default:
return false;
}
ndr = ndr_push_init_ctx(call);
if (!ndr) {
return false;
}
if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
}
ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return false;
}
/* pad to 16 byte multiple in the payload portion of the
packet. This matches what w2k3 does. Note that we can't use
ndr_push_align() as that is relative to the start of the
whole packet, whereas w2k8 wants it relative to the start
of the stub */
dce_conn->auth_state.auth_info->auth_pad_length =
(16 - (pkt->u.response.stub_and_verifier.length & 15)) & 15;
ndr_err = ndr_push_zero(ndr,
dce_conn->auth_state.auth_info->auth_pad_length);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return false;
}
payload_length = pkt->u.response.stub_and_verifier.length +
dce_conn->auth_state.auth_info->auth_pad_length;
/* 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,
dce_conn->auth_state.auth_info);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return false;
}
/* extract the whole packet as a blob */
*blob = ndr_push_blob(ndr);
/*
* 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) {
case DCERPC_AUTH_LEVEL_PRIVACY:
status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
call,
ndr->data + DCERPC_REQUEST_LENGTH,
payload_length,
blob->data,
blob->length,
&creds2);
break;
case DCERPC_AUTH_LEVEL_INTEGRITY:
status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
call,
ndr->data + DCERPC_REQUEST_LENGTH,
payload_length,
blob->data,
blob->length,
&creds2);
break;
default:
status = NT_STATUS_INVALID_LEVEL;
break;
}
if (!NT_STATUS_IS_OK(status)) {
return false;
}
if (creds2.length != sig_size) {
DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
(unsigned)creds2.length, (uint32_t)sig_size,
(unsigned)dce_conn->auth_state.auth_info->auth_pad_length,
(unsigned)pkt->u.response.stub_and_verifier.length));
dcerpc_set_frag_length(blob, blob->length + creds2.length);
dcerpc_set_auth_length(blob, creds2.length);
}
if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
status = NT_STATUS_NO_MEMORY;
return false;
}
data_blob_free(&creds2);
return true;
}
