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|
/*
* Unix SMB/CIFS implementation.
* RPC Pipe client / server routines
* Almost completely rewritten by (C) Jeremy Allison 2005 - 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/* this module apparently provides an implementation of DCE/RPC over a
* named pipe (IPC$ connection using SMBtrans). details of DCE/RPC
* documentation are available (in on-line form) from the X-Open group.
*
* this module should provide a level of abstraction between SMB
* and DCE/RPC, while minimising the amount of mallocs, unnecessary
* data copies, and network traffic.
*
*/
#include "includes.h"
#include "srv_pipe_internal.h"
#include "../librpc/gen_ndr/ndr_schannel.h"
#include "../libcli/auth/schannel.h"
#include "../libcli/auth/spnego.h"
#include "../libcli/auth/ntlmssp.h"
#include "ntlmssp_wrap.h"
#include "rpc_server.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV
/**
* Dump everything from the start of the end up of the provided data
* into a file, but only at debug level >= 50
**/
static void dump_pdu_region(const char *name, int v,
DATA_BLOB *data, size_t start, size_t end)
{
int fd, i;
char *fname = NULL;
ssize_t sz;
if (DEBUGLEVEL < 50) return;
if (start > data->length || end > data->length || start > end) return;
for (i = 1; i < 100; i++) {
if (v != -1) {
fname = talloc_asprintf(talloc_tos(),
"/tmp/%s_%d.%d.prs",
name, v, i);
} else {
fname = talloc_asprintf(talloc_tos(),
"/tmp/%s_%d.prs",
name, i);
}
if (!fname) {
return;
}
fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
if (fd != -1 || errno != EEXIST) break;
}
if (fd != -1) {
sz = write(fd, data->data + start, end - start);
i = close(fd);
if ((sz != end - start) || (i != 0) ) {
DEBUG(0, ("Error writing/closing %s: %ld!=%ld %d\n",
fname, (unsigned long)sz,
(unsigned long)end - start, i));
} else {
DEBUG(0,("created %s\n", fname));
}
}
TALLOC_FREE(fname);
}
static void free_pipe_ntlmssp_auth_data(struct pipe_auth_data *auth)
{
TALLOC_FREE(auth->a_u.auth_ntlmssp_state);
}
static void free_pipe_schannel_auth_data(struct pipe_auth_data *auth)
{
TALLOC_FREE(auth->a_u.schannel_auth);
}
static void free_pipe_auth_data(struct pipe_auth_data *auth)
{
if (auth->auth_data_free_func) {
(*auth->auth_data_free_func)(auth);
auth->auth_data_free_func = NULL;
}
}
static DATA_BLOB generic_session_key(void)
{
return data_blob("SystemLibraryDTC", 16);
}
/*******************************************************************
Generate the next PDU to be returned from the data.
********************************************************************/
static bool create_next_packet(struct pipes_struct *p,
size_t auth_length,
size_t *_pad_len)
{
union dcerpc_payload u;
uint8_t pfc_flags;
size_t data_len_left;
size_t data_len;
size_t max_len;
size_t pad_len = 0;
NTSTATUS status;
ZERO_STRUCT(u.response);
/* Set up rpc packet pfc flags. */
if (p->out_data.data_sent_length == 0) {
pfc_flags = DCERPC_PFC_FLAG_FIRST;
} else {
pfc_flags = 0;
}
/* Work out how much we can fit in a single PDU. */
data_len_left = p->out_data.rdata.length -
p->out_data.data_sent_length;
/* Ensure there really is data left to send. */
if (!data_len_left) {
DEBUG(0, ("No data left to send !\n"));
return false;
}
/* Max space available - not including padding. */
if (auth_length) {
max_len = RPC_MAX_PDU_FRAG_LEN
- DCERPC_RESPONSE_LENGTH
- DCERPC_AUTH_TRAILER_LENGTH
- auth_length;
} else {
max_len = RPC_MAX_PDU_FRAG_LEN - DCERPC_RESPONSE_LENGTH;
}
/*
* The amount we send is the minimum of the max_len
* and the amount left to send.
*/
data_len = MIN(data_len_left, max_len);
if (auth_length) {
/* Work out any padding alignment requirements. */
pad_len = (DCERPC_RESPONSE_LENGTH + data_len) %
SERVER_NDR_PADDING_SIZE;
if (pad_len) {
pad_len = SERVER_NDR_PADDING_SIZE - pad_len;
DEBUG(10, ("Padding size is: %d\n", (int)pad_len));
/* If we're over filling the packet, we need to make
* space for the padding at the end of the data. */
if (data_len + pad_len > max_len) {
data_len -= SERVER_NDR_PADDING_SIZE;
}
}
}
/* Set up the alloc hint. This should be the data left to send. */
u.response.alloc_hint = data_len_left;
/* Work out if this PDU will be the last. */
if (p->out_data.data_sent_length
+ data_len >= p->out_data.rdata.length) {
pfc_flags |= DCERPC_PFC_FLAG_LAST;
}
/* Prepare data to be NDR encoded. */
u.response.stub_and_verifier =
data_blob_const(p->out_data.rdata.data +
p->out_data.data_sent_length, data_len);
/* Store the packet in the data stream. */
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_RESPONSE,
pfc_flags,
auth_length,
p->call_id,
&u,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall RPC Packet.\n"));
return false;
}
if (auth_length) {
/* Set the proper length on the pdu, including padding.
* Only needed if an auth trailer will be appended. */
dcerpc_set_frag_length(&p->out_data.frag,
p->out_data.frag.length
+ pad_len
+ DCERPC_AUTH_TRAILER_LENGTH
+ auth_length);
}
/* Setup the counts for this PDU. */
p->out_data.data_sent_length += data_len;
p->out_data.current_pdu_sent = 0;
*_pad_len = pad_len;
return true;
}
/*******************************************************************
Generate the next PDU to be returned from the data in p->rdata.
********************************************************************/
bool create_next_pdu(struct pipes_struct *p)
{
size_t auth_len = 0;
size_t pad_len = 0;
NTSTATUS status;
bool ret;
/*
* If we're in the fault state, keep returning fault PDU's until
* the pipe gets closed. JRA.
*/
if (p->fault_state) {
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return true;
}
switch (p->auth.auth_level) {
case DCERPC_AUTH_LEVEL_NONE:
case DCERPC_AUTH_LEVEL_CONNECT:
/* This is incorrect for auth level connect. Fixme. JRA */
/* No authentication done. */
break;
case DCERPC_AUTH_LEVEL_CALL:
case DCERPC_AUTH_LEVEL_PACKET:
case DCERPC_AUTH_LEVEL_INTEGRITY:
case DCERPC_AUTH_LEVEL_PRIVACY:
switch(p->auth.auth_type) {
case DCERPC_AUTH_TYPE_NTLMSSP:
auth_len = NTLMSSP_SIG_SIZE;
break;
case DCERPC_AUTH_TYPE_SPNEGO:
if (p->auth.spnego_type !=
PIPE_AUTH_TYPE_SPNEGO_NTLMSSP) {
goto err_out;
}
auth_len = NTLMSSP_SIG_SIZE;
break;
case DCERPC_AUTH_TYPE_SCHANNEL:
auth_len = NL_AUTH_SIGNATURE_SIZE;
break;
default:
goto err_out;
}
break;
default:
goto err_out;
}
ret = create_next_packet(p, auth_len, &pad_len);
if (!ret) {
return false;
}
if (auth_len) {
status = dcerpc_add_auth_footer(&p->auth, pad_len,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
data_blob_free(&p->out_data.frag);
return false;
}
}
return true;
err_out:
DEBUG(0, ("Invalid internal auth level %u / type %u\n",
(unsigned int)p->auth.auth_level,
(unsigned int)p->auth.auth_type));
return false;
}
/*******************************************************************
Process an NTLMSSP authentication response.
If this function succeeds, the user has been authenticated
and their domain, name and calling workstation stored in
the pipe struct.
*******************************************************************/
static bool pipe_ntlmssp_verify_final(struct pipes_struct *p,
DATA_BLOB *p_resp_blob)
{
DATA_BLOB session_key, reply;
NTSTATUS status;
struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state;
bool ret;
DEBUG(5,("pipe_ntlmssp_verify_final: pipe %s checking user details\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
ZERO_STRUCT(reply);
/* this has to be done as root in order to verify the password */
become_root();
status = auth_ntlmssp_update(a, *p_resp_blob, &reply);
unbecome_root();
/* Don't generate a reply. */
data_blob_free(&reply);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
/* Finally - if the pipe negotiated integrity (sign) or privacy (seal)
ensure the underlying NTLMSSP flags are also set. If not we should
refuse the bind. */
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_INTEGRITY) {
if (!auth_ntlmssp_negotiated_sign(a)) {
DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet integrity requested "
"but client declined signing.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
return False;
}
}
if (p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY) {
if (!auth_ntlmssp_negotiated_seal(a)) {
DEBUG(0,("pipe_ntlmssp_verify_final: pipe %s : packet privacy requested "
"but client declined sealing.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
return False;
}
}
DEBUG(5, ("pipe_ntlmssp_verify_final: OK: user: %s domain: %s "
"workstation: %s\n",
auth_ntlmssp_get_username(a),
auth_ntlmssp_get_domain(a),
auth_ntlmssp_get_client(a)));
TALLOC_FREE(p->server_info);
status = auth_ntlmssp_steal_server_info(p, a, &p->server_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("auth_ntlmssp_server_info failed to obtain the server info for authenticated user: %s\n",
nt_errstr(status)));
return false;
}
if (p->server_info->ptok == NULL) {
DEBUG(1,("Error: Authmodule failed to provide nt_user_token\n"));
return False;
}
/*
* We're an authenticated bind over smb, so the session key needs to
* be set to "SystemLibraryDTC". Weird, but this is what Windows
* does. See the RPC-SAMBA3SESSIONKEY.
*/
session_key = generic_session_key();
if (session_key.data == NULL) {
return False;
}
ret = server_info_set_session_key(p->server_info, session_key);
data_blob_free(&session_key);
return True;
}
/*******************************************************************
This is the "stage3" NTLMSSP response after a bind request and reply.
*******************************************************************/
bool api_pipe_bind_auth3(struct pipes_struct *p, struct ncacn_packet *pkt)
{
struct dcerpc_auth auth_info;
NTSTATUS status;
DEBUG(5, ("api_pipe_bind_auth3: decode request. %d\n", __LINE__));
if (pkt->auth_length == 0) {
DEBUG(0, ("No auth field sent for bind request!\n"));
goto err;
}
/* Ensure there's enough data for an authenticated request. */
if (pkt->frag_length < RPC_HEADER_LEN
+ DCERPC_AUTH_TRAILER_LENGTH
+ pkt->auth_length) {
DEBUG(0,("api_pipe_ntlmssp_auth_process: auth_len "
"%u is too large.\n",
(unsigned int)pkt->auth_length));
goto err;
}
/*
* Decode the authentication verifier response.
*/
status = dcerpc_pull_dcerpc_auth(pkt,
&pkt->u.auth3.auth_info,
&auth_info, p->endian);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to unmarshall dcerpc_auth.\n"));
goto err;
}
/* We must NEVER look at auth_info->auth_pad_len here,
* as old Samba client code gets it wrong and sends it
* as zero. JRA.
*/
if (auth_info.auth_type != DCERPC_AUTH_TYPE_NTLMSSP) {
DEBUG(0,("api_pipe_bind_auth3: incorrect auth type (%u).\n",
(unsigned int)auth_info.auth_type ));
return False;
}
/*
* The following call actually checks the challenge/response data.
* for correctness against the given DOMAIN\user name.
*/
if (!pipe_ntlmssp_verify_final(p, &auth_info.credentials)) {
goto err;
}
p->pipe_bound = True;
return True;
err:
free_pipe_auth_data(&p->auth);
return False;
}
static bool pipe_init_outgoing_data(struct pipes_struct *p);
/*******************************************************************
Marshall a bind_nak pdu.
*******************************************************************/
static bool setup_bind_nak(struct pipes_struct *p, struct ncacn_packet *pkt)
{
NTSTATUS status;
union dcerpc_payload u;
/* Free any memory in the current return data buffer. */
pipe_init_outgoing_data(p);
/*
* Initialize a bind_nak header.
*/
ZERO_STRUCT(u);
u.bind_nak.reject_reason = 0;
/*
* Marshall directly into the outgoing PDU space. We
* must do this as we need to set to the bind response
* header and are never sending more than one PDU here.
*/
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_BIND_NAK,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST,
0,
pkt->call_id,
&u,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
free_pipe_auth_data(&p->auth);
p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE;
p->auth.auth_type = DCERPC_AUTH_TYPE_NONE;
p->auth.spnego_type = PIPE_AUTH_TYPE_SPNEGO_NONE;
p->pipe_bound = False;
return True;
}
/*******************************************************************
Marshall a fault pdu.
*******************************************************************/
bool setup_fault_pdu(struct pipes_struct *p, NTSTATUS fault_status)
{
NTSTATUS status;
union dcerpc_payload u;
/* Free any memory in the current return data buffer. */
pipe_init_outgoing_data(p);
/*
* Initialize a fault header.
*/
ZERO_STRUCT(u);
u.fault.status = NT_STATUS_V(fault_status);
u.fault._pad = data_blob_talloc_zero(p->mem_ctx, 4);
/*
* Marshall directly into the outgoing PDU space. We
* must do this as we need to set to the bind response
* header and are never sending more than one PDU here.
*/
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_FAULT,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST |
DCERPC_PFC_FLAG_DID_NOT_EXECUTE,
0,
p->call_id,
&u,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
return True;
}
/*******************************************************************
Ensure a bind request has the correct abstract & transfer interface.
Used to reject unknown binds from Win2k.
*******************************************************************/
static bool check_bind_req(struct pipes_struct *p,
struct ndr_syntax_id* abstract,
struct ndr_syntax_id* transfer,
uint32 context_id)
{
struct pipe_rpc_fns *context_fns;
DEBUG(3,("check_bind_req for %s\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* we have to check all now since win2k introduced a new UUID on the lsaprpc pipe */
if (rpc_srv_pipe_exists_by_id(abstract) &&
ndr_syntax_id_equal(transfer, &ndr_transfer_syntax)) {
DEBUG(3, ("check_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_srv_get_pipe_cli_name(abstract),
rpc_srv_get_pipe_srv_name(abstract)));
} else {
return false;
}
context_fns = SMB_MALLOC_P(struct pipe_rpc_fns);
if (context_fns == NULL) {
DEBUG(0,("check_bind_req: malloc() failed!\n"));
return False;
}
context_fns->n_cmds = rpc_srv_get_pipe_num_cmds(abstract);
context_fns->cmds = rpc_srv_get_pipe_cmds(abstract);
context_fns->context_id = context_id;
/* add to the list of open contexts */
DLIST_ADD( p->contexts, context_fns );
return True;
}
/**
* Is a named pipe known?
* @param[in] cli_filename The pipe name requested by the client
* @result Do we want to serve this?
*/
bool is_known_pipename(const char *cli_filename, struct ndr_syntax_id *syntax)
{
const char *pipename = cli_filename;
NTSTATUS status;
if (strnequal(pipename, "\\PIPE\\", 6)) {
pipename += 5;
}
if (*pipename == '\\') {
pipename += 1;
}
if (lp_disable_spoolss() && strequal(pipename, "spoolss")) {
DEBUG(10, ("refusing spoolss access\n"));
return false;
}
if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
return true;
}
status = smb_probe_module("rpc", pipename);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("is_known_pipename: %s unknown\n", cli_filename));
return false;
}
DEBUG(10, ("is_known_pipename: %s loaded dynamically\n", pipename));
/*
* Scan the list again for the interface id
*/
if (rpc_srv_get_pipe_interface_by_cli_name(pipename, syntax)) {
return true;
}
DEBUG(10, ("is_known_pipename: pipe %s did not register itself!\n",
pipename));
return false;
}
/*******************************************************************
Handle a SPNEGO krb5 bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_kerberos(struct pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *pauth_info,
DATA_BLOB *psecblob,
DATA_BLOB *response)
{
return False;
}
/*******************************************************************
Handle the first part of a SPNEGO bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_negotiate(struct pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *pauth_info,
DATA_BLOB *response)
{
DATA_BLOB secblob;
DATA_BLOB chal;
char *OIDs[ASN1_MAX_OIDS];
int i;
NTSTATUS status;
bool got_kerberos_mechanism = false;
struct auth_ntlmssp_state *a = NULL;
ZERO_STRUCT(secblob);
ZERO_STRUCT(chal);
if (pauth_info->credentials.data[0] != ASN1_APPLICATION(0)) {
goto err;
}
/* parse out the OIDs and the first sec blob */
if (!spnego_parse_negTokenInit(talloc_tos(),
pauth_info->credentials, OIDs, NULL, &secblob)) {
DEBUG(0,("pipe_spnego_auth_bind_negotiate: Failed to parse the security blob.\n"));
goto err;
}
if (strcmp(OID_KERBEROS5, OIDs[0]) == 0 || strcmp(OID_KERBEROS5_OLD, OIDs[0]) == 0) {
got_kerberos_mechanism = true;
}
for (i=0;OIDs[i];i++) {
DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got OID %s\n", OIDs[i]));
TALLOC_FREE(OIDs[i]);
}
DEBUG(3,("pipe_spnego_auth_bind_negotiate: Got secblob of size %lu\n", (unsigned long)secblob.length));
if ( got_kerberos_mechanism && ((lp_security()==SEC_ADS) || USE_KERBEROS_KEYTAB) ) {
bool ret;
ret = pipe_spnego_auth_bind_kerberos(p, mem_ctx, pauth_info,
&secblob, response);
data_blob_free(&secblob);
return ret;
}
/* Free any previous auth type. */
free_pipe_auth_data(&p->auth);
if (!got_kerberos_mechanism) {
/* Initialize the NTLM engine. */
status = auth_ntlmssp_start(&a);
if (!NT_STATUS_IS_OK(status)) {
goto err;
}
/* Clear flags,
* then set them according to requested Auth Level */
auth_ntlmssp_and_flags(a, ~(NTLMSSP_NEGOTIATE_SIGN |
NTLMSSP_NEGOTIATE_SEAL));
switch (pauth_info->auth_level) {
case DCERPC_AUTH_LEVEL_INTEGRITY:
auth_ntlmssp_or_flags(a,
NTLMSSP_NEGOTIATE_SIGN);
break;
case DCERPC_AUTH_LEVEL_PRIVACY:
/* Privacy always implies both sign and seal
* for ntlmssp */
auth_ntlmssp_or_flags(a,
NTLMSSP_NEGOTIATE_SIGN |
NTLMSSP_NEGOTIATE_SEAL);
break;
default:
break;
}
/*
* Pass the first security blob of data to it.
* This can return an error or NT_STATUS_MORE_PROCESSING_REQUIRED
* which means we need another packet to complete the bind.
*/
status = auth_ntlmssp_update(a, secblob, &chal);
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(3,("pipe_spnego_auth_bind_negotiate: auth_ntlmssp_update failed.\n"));
goto err;
}
/* Generate the response blob we need for step 2 of the bind. */
*response = spnego_gen_auth_response(mem_ctx, &chal, status, OID_NTLMSSP);
} else {
/*
* SPNEGO negotiate down to NTLMSSP. The subsequent
* code to process follow-up packets is not complete
* yet. JRA.
*/
*response = spnego_gen_auth_response(mem_ctx, NULL,
NT_STATUS_MORE_PROCESSING_REQUIRED,
OID_NTLMSSP);
}
/* auth_pad_len will be handled by the caller */
p->auth.a_u.auth_ntlmssp_state = a;
p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
p->auth.auth_type = DCERPC_AUTH_TYPE_SPNEGO;
p->auth.spnego_type = PIPE_AUTH_TYPE_SPNEGO_NTLMSSP;
data_blob_free(&secblob);
data_blob_free(&chal);
/* We can't set pipe_bound True yet - we need an RPC_ALTER_CONTEXT response packet... */
return True;
err:
data_blob_free(&secblob);
data_blob_free(&chal);
p->auth.a_u.auth_ntlmssp_state = NULL;
return False;
}
/*******************************************************************
Handle the second part of a SPNEGO bind auth.
*******************************************************************/
static bool pipe_spnego_auth_bind_continue(struct pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *pauth_info,
DATA_BLOB *response)
{
DATA_BLOB auth_blob;
DATA_BLOB auth_reply;
struct auth_ntlmssp_state *a = p->auth.a_u.auth_ntlmssp_state;
ZERO_STRUCT(auth_blob);
ZERO_STRUCT(auth_reply);
/*
* NB. If we've negotiated down from krb5 to NTLMSSP we'll currently
* fail here as 'a' == NULL.
*/
if (p->auth.auth_type != DCERPC_AUTH_TYPE_SPNEGO ||
p->auth.spnego_type != PIPE_AUTH_TYPE_SPNEGO_NTLMSSP || !a) {
DEBUG(0,("pipe_spnego_auth_bind_continue: not in NTLMSSP auth state.\n"));
goto err;
}
if (pauth_info->credentials.data[0] != ASN1_CONTEXT(1)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob type.\n"));
goto err;
}
if (!spnego_parse_auth(talloc_tos(), pauth_info->credentials, &auth_blob)) {
DEBUG(0,("pipe_spnego_auth_bind_continue: invalid SPNEGO blob.\n"));
goto err;
}
/*
* The following call actually checks the challenge/response data.
* for correctness against the given DOMAIN\user name.
*/
if (!pipe_ntlmssp_verify_final(p, &auth_blob)) {
goto err;
}
data_blob_free(&auth_blob);
/* Generate the spnego "accept completed" blob - no incoming data. */
*response = spnego_gen_auth_response(mem_ctx, &auth_reply, NT_STATUS_OK, OID_NTLMSSP);
data_blob_free(&auth_reply);
p->pipe_bound = True;
return True;
err:
data_blob_free(&auth_blob);
data_blob_free(&auth_reply);
free_pipe_auth_data(&p->auth);
return False;
}
/*******************************************************************
Handle an schannel bind auth.
*******************************************************************/
static bool pipe_schannel_auth_bind(struct pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *auth_info,
DATA_BLOB *response)
{
struct NL_AUTH_MESSAGE neg;
struct NL_AUTH_MESSAGE reply;
bool ret;
NTSTATUS status;
struct netlogon_creds_CredentialState *creds;
DATA_BLOB session_key;
enum ndr_err_code ndr_err;
ndr_err = ndr_pull_struct_blob(
&auth_info->credentials, mem_ctx, &neg,
(ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0,("pipe_schannel_auth_bind: Could not unmarshal SCHANNEL auth neg\n"));
return false;
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &neg);
}
if (!(neg.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME)) {
DEBUG(0,("pipe_schannel_auth_bind: Did not receive netbios computer name\n"));
return false;
}
/*
* The neg.oem_netbios_computer.a key here must match the remote computer name
* given in the DOM_CLNT_SRV.uni_comp_name used on all netlogon pipe
* operations that use credentials.
*/
become_root();
status = schannel_get_creds_state(p, lp_private_dir(),
neg.oem_netbios_computer.a, &creds);
unbecome_root();
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("pipe_schannel_auth_bind: Attempt to bind using schannel without successful serverauth2\n"));
return False;
}
p->auth.a_u.schannel_auth = talloc(p, struct schannel_state);
if (!p->auth.a_u.schannel_auth) {
TALLOC_FREE(creds);
return False;
}
p->auth.a_u.schannel_auth->state = SCHANNEL_STATE_START;
p->auth.a_u.schannel_auth->seq_num = 0;
p->auth.a_u.schannel_auth->initiator = false;
p->auth.a_u.schannel_auth->creds = creds;
/*
* JRA. Should we also copy the schannel session key into the pipe session key p->session_key
* here ? We do that for NTLMSSP, but the session key is already set up from the vuser
* struct of the person who opened the pipe. I need to test this further. JRA.
*
* VL. As we are mapping this to guest set the generic key
* "SystemLibraryDTC" key here. It's a bit difficult to test against
* W2k3, as it does not allow schannel binds against SAMR and LSA
* anymore.
*/
session_key = generic_session_key();
if (session_key.data == NULL) {
DEBUG(0, ("pipe_schannel_auth_bind: Could not alloc session"
" key\n"));
return false;
}
ret = server_info_set_session_key(p->server_info, session_key);
data_blob_free(&session_key);
if (!ret) {
DEBUG(0, ("server_info_set_session_key failed\n"));
return false;
}
/*** SCHANNEL verifier ***/
reply.MessageType = NL_NEGOTIATE_RESPONSE;
reply.Flags = 0;
reply.Buffer.dummy = 5; /* ??? actually I don't think
* this has any meaning
* here - gd */
ndr_err = ndr_push_struct_blob(response, mem_ctx, &reply,
(ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
DEBUG(0,("Failed to marshall NL_AUTH_MESSAGE.\n"));
return false;
}
if (DEBUGLEVEL >= 10) {
NDR_PRINT_DEBUG(NL_AUTH_MESSAGE, &reply);
}
DEBUG(10,("pipe_schannel_auth_bind: schannel auth: domain [%s] myname [%s]\n",
neg.oem_netbios_domain.a, neg.oem_netbios_computer.a));
/* We're finished with this bind - no more packets. */
p->auth.auth_data_free_func = &free_pipe_schannel_auth_data;
p->auth.auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
p->pipe_bound = True;
return True;
}
/*******************************************************************
Handle an NTLMSSP bind auth.
*******************************************************************/
static bool pipe_ntlmssp_auth_bind(struct pipes_struct *p,
TALLOC_CTX *mem_ctx,
struct dcerpc_auth *auth_info,
DATA_BLOB *response)
{
NTSTATUS status;
struct auth_ntlmssp_state *a = NULL;
if (strncmp((char *)auth_info->credentials.data, "NTLMSSP", 7) != 0) {
DEBUG(0, ("Failed to read NTLMSSP in blob\n"));
goto err;
}
/* We have an NTLMSSP blob. */
status = auth_ntlmssp_start(&a);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_start failed: %s\n",
nt_errstr(status) ));
goto err;
}
/* Clear flags, then set them according to requested Auth Level */
auth_ntlmssp_and_flags(a, ~(NTLMSSP_NEGOTIATE_SIGN |
NTLMSSP_NEGOTIATE_SEAL));
switch (auth_info->auth_level) {
case DCERPC_AUTH_LEVEL_INTEGRITY:
auth_ntlmssp_or_flags(a, NTLMSSP_NEGOTIATE_SIGN);
break;
case DCERPC_AUTH_LEVEL_PRIVACY:
/* Privacy always implies both sign and seal for ntlmssp */
auth_ntlmssp_or_flags(a, NTLMSSP_NEGOTIATE_SIGN |
NTLMSSP_NEGOTIATE_SEAL);
break;
default:
break;
}
status = auth_ntlmssp_update(a, auth_info->credentials, response);
if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(0,("pipe_ntlmssp_auth_bind: auth_ntlmssp_update failed: %s\n",
nt_errstr(status) ));
goto err;
}
/* Make sure data is bound to the memctx, to be freed the caller */
talloc_steal(mem_ctx, response->data);
p->auth.a_u.auth_ntlmssp_state = a;
p->auth.auth_data_free_func = &free_pipe_ntlmssp_auth_data;
p->auth.auth_type = DCERPC_AUTH_TYPE_NTLMSSP;
DEBUG(10,("pipe_ntlmssp_auth_bind: NTLMSSP auth started\n"));
/* We can't set pipe_bound True yet - we need an DCERPC_PKT_AUTH3 response packet... */
return True;
err:
TALLOC_FREE(a);
return False;
}
/*******************************************************************
Respond to a pipe bind request.
*******************************************************************/
bool api_pipe_bind_req(struct pipes_struct *p, struct ncacn_packet *pkt)
{
struct dcerpc_auth auth_info;
uint16 assoc_gid;
unsigned int auth_type = DCERPC_AUTH_TYPE_NONE;
NTSTATUS status;
struct ndr_syntax_id id;
union dcerpc_payload u;
struct dcerpc_ack_ctx bind_ack_ctx;
DATA_BLOB auth_resp = data_blob_null;
DATA_BLOB auth_blob = data_blob_null;
/* No rebinds on a bound pipe - use alter context. */
if (p->pipe_bound) {
DEBUG(2,("api_pipe_bind_req: rejecting bind request on bound "
"pipe %s.\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
return setup_bind_nak(p, pkt);
}
if (pkt->u.bind.num_contexts == 0) {
DEBUG(0, ("api_pipe_bind_req: no rpc contexts around\n"));
goto err_exit;
}
/*
* Try and find the correct pipe name to ensure
* that this is a pipe name we support.
*/
id = pkt->u.bind.ctx_list[0].abstract_syntax;
if (rpc_srv_pipe_exists_by_id(&id)) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_srv_get_pipe_cli_name(&id),
rpc_srv_get_pipe_srv_name(&id)));
} else {
status = smb_probe_module(
"rpc", get_pipe_name_from_syntax(
talloc_tos(),
&pkt->u.bind.ctx_list[0].abstract_syntax));
if (NT_STATUS_IS_ERR(status)) {
DEBUG(3,("api_pipe_bind_req: Unknown pipe name %s in bind request.\n",
get_pipe_name_from_syntax(
talloc_tos(),
&pkt->u.bind.ctx_list[0].abstract_syntax)));
return setup_bind_nak(p, pkt);
}
if (rpc_srv_get_pipe_interface_by_cli_name(
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax),
&id)) {
DEBUG(3, ("api_pipe_bind_req: \\PIPE\\%s -> \\PIPE\\%s\n",
rpc_srv_get_pipe_cli_name(&id),
rpc_srv_get_pipe_srv_name(&id)));
} else {
DEBUG(0, ("module %s doesn't provide functions for "
"pipe %s!\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax),
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
return setup_bind_nak(p, pkt);
}
}
DEBUG(5,("api_pipe_bind_req: make response. %d\n", __LINE__));
if (pkt->u.bind.assoc_group_id != 0) {
assoc_gid = pkt->u.bind.assoc_group_id;
} else {
assoc_gid = 0x53f0;
}
/*
* Create the bind response struct.
*/
/* If the requested abstract synt uuid doesn't match our client pipe,
reject the bind_ack & set the transfer interface synt to all 0's,
ver 0 (observed when NT5 attempts to bind to abstract interfaces
unknown to NT4)
Needed when adding entries to a DACL from NT5 - SK */
if (check_bind_req(p,
&pkt->u.bind.ctx_list[0].abstract_syntax,
&pkt->u.bind.ctx_list[0].transfer_syntaxes[0],
pkt->u.bind.ctx_list[0].context_id)) {
bind_ack_ctx.result = 0;
bind_ack_ctx.reason = 0;
bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0];
} else {
p->pipe_bound = False;
/* Rejection reason: abstract syntax not supported */
bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT;
bind_ack_ctx.reason = DCERPC_BIND_REASON_ASYNTAX;
bind_ack_ctx.syntax = null_ndr_syntax_id;
}
/*
* Check if this is an authenticated bind request.
*/
if (pkt->auth_length) {
/* Quick length check. Won't catch a bad auth footer,
* prevents overrun. */
if (pkt->frag_length < RPC_HEADER_LEN +
DCERPC_AUTH_TRAILER_LENGTH +
pkt->auth_length) {
DEBUG(0,("api_pipe_bind_req: auth_len (%u) "
"too long for fragment %u.\n",
(unsigned int)pkt->auth_length,
(unsigned int)pkt->frag_length));
goto err_exit;
}
/*
* Decode the authentication verifier.
*/
status = dcerpc_pull_dcerpc_auth(pkt,
&pkt->u.bind.auth_info,
&auth_info, p->endian);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n"));
goto err_exit;
}
auth_type = auth_info.auth_type;
/* Work out if we have to sign or seal etc. */
switch (auth_info.auth_level) {
case DCERPC_AUTH_LEVEL_INTEGRITY:
p->auth.auth_level = DCERPC_AUTH_LEVEL_INTEGRITY;
break;
case DCERPC_AUTH_LEVEL_PRIVACY:
p->auth.auth_level = DCERPC_AUTH_LEVEL_PRIVACY;
break;
default:
DEBUG(0, ("Unexpected auth level (%u).\n",
(unsigned int)auth_info.auth_level ));
goto err_exit;
}
switch (auth_type) {
case DCERPC_AUTH_TYPE_NTLMSSP:
if (!pipe_ntlmssp_auth_bind(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
assoc_gid = 0x7a77;
break;
case DCERPC_AUTH_TYPE_SCHANNEL:
if (!pipe_schannel_auth_bind(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_SPNEGO:
if (!pipe_spnego_auth_bind_negotiate(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
break;
case DCERPC_AUTH_TYPE_NONE:
break;
default:
DEBUG(0, ("Unknown auth type %x requested.\n", auth_type));
goto err_exit;
}
}
if (auth_type == DCERPC_AUTH_TYPE_NONE) {
/* Unauthenticated bind request. */
/* We're finished - no more packets. */
p->auth.auth_type = DCERPC_AUTH_TYPE_NONE;
p->auth.spnego_type = PIPE_AUTH_TYPE_SPNEGO_NONE;
/* We must set the pipe auth_level here also. */
p->auth.auth_level = DCERPC_AUTH_LEVEL_NONE;
p->pipe_bound = True;
/* The session key was initialized from the SMB
* session in make_internal_rpc_pipe_p */
}
ZERO_STRUCT(u.bind_ack);
u.bind_ack.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
u.bind_ack.max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
u.bind_ack.assoc_group_id = assoc_gid;
/* name has to be \PIPE\xxxxx */
u.bind_ack.secondary_address =
talloc_asprintf(pkt, "\\PIPE\\%s",
rpc_srv_get_pipe_srv_name(&id));
if (!u.bind_ack.secondary_address) {
DEBUG(0, ("Out of memory!\n"));
goto err_exit;
}
u.bind_ack.secondary_address_size =
strlen(u.bind_ack.secondary_address) + 1;
u.bind_ack.num_results = 1;
u.bind_ack.ctx_list = &bind_ack_ctx;
/* NOTE: We leave the auth_info empty so we can calculate the padding
* later and then append the auth_info --simo */
/*
* Marshall directly into the outgoing PDU space. We
* must do this as we need to set to the bind response
* header and are never sending more than one PDU here.
*/
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_BIND_ACK,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST,
auth_resp.length,
pkt->call_id,
&u,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n",
nt_errstr(status)));
}
if (auth_resp.length) {
status = dcerpc_push_dcerpc_auth(pkt,
auth_type,
auth_info.auth_level,
0,
1, /* auth_context_id */
&auth_resp,
&auth_blob);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Marshalling of dcerpc_auth failed.\n"));
goto err_exit;
}
}
/* Now that we have the auth len store it into the right place in
* the dcerpc header */
dcerpc_set_frag_length(&p->out_data.frag,
p->out_data.frag.length + auth_blob.length);
if (auth_blob.length) {
if (!data_blob_append(p->mem_ctx, &p->out_data.frag,
auth_blob.data, auth_blob.length)) {
DEBUG(0, ("Append of auth info failed.\n"));
goto err_exit;
}
}
/*
* Setup the lengths for the initial reply.
*/
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
TALLOC_FREE(auth_blob.data);
return True;
err_exit:
data_blob_free(&p->out_data.frag);
TALLOC_FREE(auth_blob.data);
return setup_bind_nak(p, pkt);
}
/****************************************************************************
Deal with an alter context call. Can be third part of 3 leg auth request for
SPNEGO calls.
****************************************************************************/
bool api_pipe_alter_context(struct pipes_struct *p, struct ncacn_packet *pkt)
{
struct dcerpc_auth auth_info;
uint16 assoc_gid;
NTSTATUS status;
union dcerpc_payload u;
struct dcerpc_ack_ctx bind_ack_ctx;
DATA_BLOB auth_resp = data_blob_null;
DATA_BLOB auth_blob = data_blob_null;
int pad_len = 0;
DEBUG(5,("api_pipe_alter_context: make response. %d\n", __LINE__));
if (pkt->u.bind.assoc_group_id != 0) {
assoc_gid = pkt->u.bind.assoc_group_id;
} else {
assoc_gid = 0x53f0;
}
/*
* Create the bind response struct.
*/
/* If the requested abstract synt uuid doesn't match our client pipe,
reject the bind_ack & set the transfer interface synt to all 0's,
ver 0 (observed when NT5 attempts to bind to abstract interfaces
unknown to NT4)
Needed when adding entries to a DACL from NT5 - SK */
if (check_bind_req(p,
&pkt->u.bind.ctx_list[0].abstract_syntax,
&pkt->u.bind.ctx_list[0].transfer_syntaxes[0],
pkt->u.bind.ctx_list[0].context_id)) {
bind_ack_ctx.result = 0;
bind_ack_ctx.reason = 0;
bind_ack_ctx.syntax = pkt->u.bind.ctx_list[0].transfer_syntaxes[0];
} else {
p->pipe_bound = False;
/* Rejection reason: abstract syntax not supported */
bind_ack_ctx.result = DCERPC_BIND_PROVIDER_REJECT;
bind_ack_ctx.reason = DCERPC_BIND_REASON_ASYNTAX;
bind_ack_ctx.syntax = null_ndr_syntax_id;
}
/*
* Check if this is an authenticated alter context request.
*/
if (pkt->auth_length) {
/* Quick length check. Won't catch a bad auth footer,
* prevents overrun. */
if (pkt->frag_length < RPC_HEADER_LEN +
DCERPC_AUTH_TRAILER_LENGTH +
pkt->auth_length) {
DEBUG(0,("api_pipe_alter_context: auth_len (%u) "
"too long for fragment %u.\n",
(unsigned int)pkt->auth_length,
(unsigned int)pkt->frag_length ));
goto err_exit;
}
status = dcerpc_pull_dcerpc_auth(pkt,
&pkt->u.bind.auth_info,
&auth_info, p->endian);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Unable to unmarshall dcerpc_auth.\n"));
goto err_exit;
}
/*
* Currently only the SPNEGO auth type uses the alter ctx
* response in place of the NTLMSSP auth3 type.
*/
if (auth_info.auth_type == DCERPC_AUTH_TYPE_SPNEGO) {
/* We can only finish if the pipe is unbound. */
if (!p->pipe_bound) {
if (!pipe_spnego_auth_bind_continue(p, pkt,
&auth_info, &auth_resp)) {
goto err_exit;
}
} else {
goto err_exit;
}
}
}
ZERO_STRUCT(u.alter_resp);
u.alter_resp.max_xmit_frag = RPC_MAX_PDU_FRAG_LEN;
u.alter_resp.max_recv_frag = RPC_MAX_PDU_FRAG_LEN;
u.alter_resp.assoc_group_id = assoc_gid;
/* secondary address CAN be NULL
* as the specs say it's ignored.
* It MUST be NULL to have the spoolss working.
*/
u.alter_resp.secondary_address = "";
u.alter_resp.secondary_address_size = 1;
u.alter_resp.num_results = 1;
u.alter_resp.ctx_list = &bind_ack_ctx;
/* NOTE: We leave the auth_info empty so we can calculate the padding
* later and then append the auth_info --simo */
/*
* Marshall directly into the outgoing PDU space. We
* must do this as we need to set to the bind response
* header and are never sending more than one PDU here.
*/
status = dcerpc_push_ncacn_packet(p->mem_ctx,
DCERPC_PKT_ALTER_RESP,
DCERPC_PFC_FLAG_FIRST |
DCERPC_PFC_FLAG_LAST,
auth_resp.length,
pkt->call_id,
&u,
&p->out_data.frag);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to marshall bind_ack packet. (%s)\n",
nt_errstr(status)));
}
if (auth_resp.length) {
/* Work out any padding needed before the auth footer. */
pad_len = p->out_data.frag.length % SERVER_NDR_PADDING_SIZE;
if (pad_len) {
pad_len = SERVER_NDR_PADDING_SIZE - pad_len;
DEBUG(10, ("auth pad_len = %u\n",
(unsigned int)pad_len));
}
status = dcerpc_push_dcerpc_auth(pkt,
auth_info.auth_type,
auth_info.auth_level,
pad_len,
1, /* auth_context_id */
&auth_resp,
&auth_blob);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Marshalling of dcerpc_auth failed.\n"));
goto err_exit;
}
}
/* Now that we have the auth len store it into the right place in
* the dcerpc header */
dcerpc_set_frag_length(&p->out_data.frag,
p->out_data.frag.length +
pad_len + auth_blob.length);
if (auth_resp.length) {
if (pad_len) {
char pad[SERVER_NDR_PADDING_SIZE];
memset(pad, '\0', SERVER_NDR_PADDING_SIZE);
if (!data_blob_append(p->mem_ctx,
&p->out_data.frag,
pad, pad_len)) {
DEBUG(0, ("api_pipe_bind_req: failed to add "
"%u bytes of pad data.\n",
(unsigned int)pad_len));
goto err_exit;
}
}
if (!data_blob_append(p->mem_ctx, &p->out_data.frag,
auth_blob.data, auth_blob.length)) {
DEBUG(0, ("Append of auth info failed.\n"));
goto err_exit;
}
}
/*
* Setup the lengths for the initial reply.
*/
p->out_data.data_sent_length = 0;
p->out_data.current_pdu_sent = 0;
TALLOC_FREE(auth_blob.data);
return True;
err_exit:
data_blob_free(&p->out_data.frag);
TALLOC_FREE(auth_blob.data);
return setup_bind_nak(p, pkt);
}
/****************************************************************************
Find the set of RPC functions associated with this context_id
****************************************************************************/
static PIPE_RPC_FNS* find_pipe_fns_by_context( PIPE_RPC_FNS *list, uint32 context_id )
{
PIPE_RPC_FNS *fns = NULL;
if ( !list ) {
DEBUG(0,("find_pipe_fns_by_context: ERROR! No context list for pipe!\n"));
return NULL;
}
for (fns=list; fns; fns=fns->next ) {
if ( fns->context_id == context_id )
return fns;
}
return NULL;
}
/****************************************************************************
Memory cleanup.
****************************************************************************/
void free_pipe_rpc_context( PIPE_RPC_FNS *list )
{
PIPE_RPC_FNS *tmp = list;
PIPE_RPC_FNS *tmp2;
while (tmp) {
tmp2 = tmp->next;
SAFE_FREE(tmp);
tmp = tmp2;
}
return;
}
static bool api_rpcTNP(struct pipes_struct *p, struct ncacn_packet *pkt,
const struct api_struct *api_rpc_cmds, int n_cmds);
/****************************************************************************
Find the correct RPC function to call for this request.
If the pipe is authenticated then become the correct UNIX user
before doing the call.
****************************************************************************/
bool api_pipe_request(struct pipes_struct *p, struct ncacn_packet *pkt)
{
bool ret = False;
bool changed_user = False;
PIPE_RPC_FNS *pipe_fns;
if (p->pipe_bound &&
((p->auth.auth_type == DCERPC_AUTH_TYPE_NTLMSSP) ||
((p->auth.auth_type == DCERPC_AUTH_TYPE_SPNEGO) &&
(p->auth.spnego_type == PIPE_AUTH_TYPE_SPNEGO_NTLMSSP)))) {
if(!become_authenticated_pipe_user(p)) {
data_blob_free(&p->out_data.rdata);
return False;
}
changed_user = True;
}
DEBUG(5, ("Requested \\PIPE\\%s\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* get the set of RPC functions for this context */
pipe_fns = find_pipe_fns_by_context(p->contexts,
pkt->u.request.context_id);
if ( pipe_fns ) {
TALLOC_CTX *frame = talloc_stackframe();
ret = api_rpcTNP(p, pkt, pipe_fns->cmds, pipe_fns->n_cmds);
TALLOC_FREE(frame);
}
else {
DEBUG(0, ("No rpc function table associated with context "
"[%d] on pipe [%s]\n",
pkt->u.request.context_id,
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
}
if (changed_user) {
unbecome_authenticated_pipe_user();
}
return ret;
}
/*******************************************************************
Calls the underlying RPC function for a named pipe.
********************************************************************/
static bool api_rpcTNP(struct pipes_struct *p, struct ncacn_packet *pkt,
const struct api_struct *api_rpc_cmds, int n_cmds)
{
int fn_num;
uint32_t offset1;
/* interpret the command */
DEBUG(4,("api_rpcTNP: %s op 0x%x - ",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
pkt->u.request.opnum));
if (DEBUGLEVEL >= 50) {
fstring name;
slprintf(name, sizeof(name)-1, "in_%s",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax));
dump_pdu_region(name, pkt->u.request.opnum,
&p->in_data.data, 0,
p->in_data.data.length);
}
for (fn_num = 0; fn_num < n_cmds; fn_num++) {
if (api_rpc_cmds[fn_num].opnum == pkt->u.request.opnum &&
api_rpc_cmds[fn_num].fn != NULL) {
DEBUG(3, ("api_rpcTNP: rpc command: %s\n",
api_rpc_cmds[fn_num].name));
break;
}
}
if (fn_num == n_cmds) {
/*
* For an unknown RPC just return a fault PDU but
* return True to allow RPC's on the pipe to continue
* and not put the pipe into fault state. JRA.
*/
DEBUG(4, ("unknown\n"));
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
offset1 = p->out_data.rdata.length;
DEBUG(6, ("api_rpc_cmds[%d].fn == %p\n",
fn_num, api_rpc_cmds[fn_num].fn));
/* do the actual command */
if(!api_rpc_cmds[fn_num].fn(p)) {
DEBUG(0,("api_rpcTNP: %s: %s failed.\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax),
api_rpc_cmds[fn_num].name));
data_blob_free(&p->out_data.rdata);
return False;
}
if (p->bad_handle_fault_state) {
DEBUG(4,("api_rpcTNP: bad handle fault return.\n"));
p->bad_handle_fault_state = False;
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_CONTEXT_MISMATCH));
return True;
}
if (p->rng_fault_state) {
DEBUG(4, ("api_rpcTNP: rng fault return\n"));
p->rng_fault_state = False;
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
return True;
}
if (DEBUGLEVEL >= 50) {
fstring name;
slprintf(name, sizeof(name)-1, "out_%s",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax));
dump_pdu_region(name, pkt->u.request.opnum,
&p->out_data.rdata, offset1,
p->out_data.rdata.length);
}
DEBUG(5,("api_rpcTNP: called %s successfully\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
/* Check for buffer underflow in rpc parsing */
if ((DEBUGLEVEL >= 10) &&
(pkt->frag_length < p->in_data.data.length)) {
DEBUG(10, ("api_rpcTNP: rpc input buffer underflow (parse error?)\n"));
dump_data(10, p->in_data.data.data + pkt->frag_length,
p->in_data.data.length - pkt->frag_length);
}
return True;
}
/****************************************************************************
Initialise an outgoing packet.
****************************************************************************/
static bool pipe_init_outgoing_data(struct pipes_struct *p)
{
output_data *o_data = &p->out_data;
/* Reset the offset counters. */
o_data->data_sent_length = 0;
o_data->current_pdu_sent = 0;
data_blob_free(&o_data->frag);
/* Free any memory in the current return data buffer. */
data_blob_free(&o_data->rdata);
return True;
}
/****************************************************************************
Sets the fault state on incoming packets.
****************************************************************************/
void set_incoming_fault(struct pipes_struct *p)
{
data_blob_free(&p->in_data.data);
p->in_data.pdu_needed_len = 0;
p->in_data.pdu.length = 0;
p->fault_state = True;
DEBUG(10, ("set_incoming_fault: Setting fault state on pipe %s\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
}
static NTSTATUS dcesrv_auth_request(struct pipe_auth_data *auth,
struct ncacn_packet *pkt,
DATA_BLOB *raw_pkt)
{
NTSTATUS status;
size_t hdr_size = DCERPC_REQUEST_LENGTH;
size_t pad_len;
DEBUG(10, ("Checking request auth.\n"));
if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
hdr_size += 16;
}
/* in case of sealing this function will unseal the data in place */
status = dcerpc_check_auth(auth, pkt,
&pkt->u.request.stub_and_verifier,
hdr_size, raw_pkt,
&pad_len);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/* remove padding and auth trailer,
* this way the caller will get just the data */
if (pkt->auth_length) {
size_t trail_len = pad_len
+ DCERPC_AUTH_TRAILER_LENGTH
+ pkt->auth_length;
if (pkt->u.request.stub_and_verifier.length < trail_len) {
return NT_STATUS_INFO_LENGTH_MISMATCH;
}
pkt->u.request.stub_and_verifier.length -= trail_len;
}
return NT_STATUS_OK;
}
/****************************************************************************
Processes a request pdu. This will do auth processing if needed, and
appends the data into the complete stream if the LAST flag is not set.
****************************************************************************/
static bool process_request_pdu(struct pipes_struct *p, struct ncacn_packet *pkt)
{
NTSTATUS status;
DATA_BLOB data;
if (!p->pipe_bound) {
DEBUG(0,("process_request_pdu: rpc request with no bind.\n"));
set_incoming_fault(p);
return False;
}
/* Store the opnum */
p->opnum = pkt->u.request.opnum;
status = dcesrv_auth_request(&p->auth, pkt, &p->in_data.pdu);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to check packet auth. (%s)\n",
nt_errstr(status)));
set_incoming_fault(p);
return false;
}
data = pkt->u.request.stub_and_verifier;
/*
* Check the data length doesn't go over the 15Mb limit.
* increased after observing a bug in the Windows NT 4.0 SP6a
* spoolsv.exe when the response to a GETPRINTERDRIVER2 RPC
* will not fit in the initial buffer of size 0x1068 --jerry 22/01/2002
*/
if (p->in_data.data.length + data.length > MAX_RPC_DATA_SIZE) {
DEBUG(0, ("process_request_pdu: "
"rpc data buffer too large (%u) + (%u)\n",
(unsigned int)p->in_data.data.length,
(unsigned int)data.length));
set_incoming_fault(p);
return False;
}
/*
* Append the data portion into the buffer and return.
*/
if (data.length) {
if (!data_blob_append(p->mem_ctx, &p->in_data.data,
data.data, data.length)) {
DEBUG(0, ("Unable to append data size %u "
"to parse buffer of size %u.\n",
(unsigned int)data.length,
(unsigned int)p->in_data.data.length));
set_incoming_fault(p);
return False;
}
}
if (pkt->pfc_flags & DCERPC_PFC_FLAG_LAST) {
bool ret = False;
/*
* Ok - we finally have a complete RPC stream.
* Call the rpc command to process it.
*/
/*
* Process the complete data stream here.
*/
if (pipe_init_outgoing_data(p)) {
ret = api_pipe_request(p, pkt);
}
return ret;
}
return True;
}
/****************************************************************************
Processes a finished PDU stored in p->in_data.pdu.
****************************************************************************/
void process_complete_pdu(struct pipes_struct *p)
{
struct ncacn_packet *pkt = NULL;
NTSTATUS status;
bool reply = False;
if(p->fault_state) {
DEBUG(10,("process_complete_pdu: pipe %s in fault state.\n",
get_pipe_name_from_syntax(talloc_tos(), &p->syntax)));
goto done;
}
pkt = talloc(p->mem_ctx, struct ncacn_packet);
if (!pkt) {
DEBUG(0, ("Out of memory!\n"));
goto done;
}
/*
* Ensure we're using the corrent endianness for both the
* RPC header flags and the raw data we will be reading from.
*/
if (dcerpc_get_endian_flag(&p->in_data.pdu) & DCERPC_DREP_LE) {
p->endian = RPC_LITTLE_ENDIAN;
} else {
p->endian = RPC_BIG_ENDIAN;
}
DEBUG(10, ("PDU is in %s Endian format!\n", p->endian?"Big":"Little"));
status = dcerpc_pull_ncacn_packet(pkt, &p->in_data.pdu,
pkt, p->endian);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to unmarshal rpc packet: %s!\n",
nt_errstr(status)));
goto done;
}
/* Store the call_id */
p->call_id = pkt->call_id;
DEBUG(10, ("Processing packet type %d\n", (int)pkt->ptype));
switch (pkt->ptype) {
case DCERPC_PKT_REQUEST:
reply = process_request_pdu(p, pkt);
break;
case DCERPC_PKT_PING: /* CL request - ignore... */
DEBUG(0, ("process_complete_pdu: Error. "
"Connectionless packet type %d received on "
"pipe %s.\n", (int)pkt->ptype,
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_RESPONSE: /* No responses here. */
DEBUG(0, ("process_complete_pdu: Error. "
"DCERPC_PKT_RESPONSE received from client "
"on pipe %s.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_FAULT:
case DCERPC_PKT_WORKING:
/* CL request - reply to a ping when a call in process. */
case DCERPC_PKT_NOCALL:
/* CL - server reply to a ping call. */
case DCERPC_PKT_REJECT:
case DCERPC_PKT_ACK:
case DCERPC_PKT_CL_CANCEL:
case DCERPC_PKT_FACK:
case DCERPC_PKT_CANCEL_ACK:
DEBUG(0, ("process_complete_pdu: Error. "
"Connectionless packet type %u received on "
"pipe %s.\n", (unsigned int)pkt->ptype,
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_BIND:
/*
* We assume that a pipe bind is only in one pdu.
*/
if (pipe_init_outgoing_data(p)) {
reply = api_pipe_bind_req(p, pkt);
}
break;
case DCERPC_PKT_BIND_ACK:
case DCERPC_PKT_BIND_NAK:
DEBUG(0, ("process_complete_pdu: Error. "
"DCERPC_PKT_BINDACK/DCERPC_PKT_BINDNACK "
"packet type %u received on pipe %s.\n",
(unsigned int)pkt->ptype,
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_ALTER:
/*
* We assume that a pipe bind is only in one pdu.
*/
if (pipe_init_outgoing_data(p)) {
reply = api_pipe_alter_context(p, pkt);
}
break;
case DCERPC_PKT_ALTER_RESP:
DEBUG(0, ("process_complete_pdu: Error. "
"DCERPC_PKT_ALTER_RESP on pipe %s: "
"Should only be server -> client.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_AUTH3:
/*
* The third packet in an NTLMSSP auth exchange.
*/
if (pipe_init_outgoing_data(p)) {
reply = api_pipe_bind_auth3(p, pkt);
}
break;
case DCERPC_PKT_SHUTDOWN:
DEBUG(0, ("process_complete_pdu: Error. "
"DCERPC_PKT_SHUTDOWN on pipe %s: "
"Should only be server -> client.\n",
get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
break;
case DCERPC_PKT_CO_CANCEL:
/* For now just free all client data and continue
* processing. */
DEBUG(3,("process_complete_pdu: DCERPC_PKT_CO_CANCEL."
" Abandoning rpc call.\n"));
/* As we never do asynchronous RPC serving, we can
* never cancel a call (as far as I know).
* If we ever did we'd have to send a cancel_ack reply.
* For now, just free all client data and continue
* processing. */
reply = True;
break;
#if 0
/* Enable this if we're doing async rpc. */
/* We must check the outstanding callid matches. */
if (pipe_init_outgoing_data(p)) {
/* Send a cancel_ack PDU reply. */
/* We should probably check the auth-verifier here. */
reply = setup_cancel_ack_reply(p, pkt);
}
break;
#endif
case DCERPC_PKT_ORPHANED:
/* We should probably check the auth-verifier here.
* For now just free all client data and continue
* processing. */
DEBUG(3, ("process_complete_pdu: DCERPC_PKT_ORPHANED."
" Abandoning rpc call.\n"));
reply = True;
break;
default:
DEBUG(0, ("process_complete_pdu: "
"Unknown rpc type = %u received.\n",
(unsigned int)pkt->ptype));
break;
}
done:
if (!reply) {
DEBUG(3,("process_complete_pdu: DCE/RPC fault sent on "
"pipe %s\n", get_pipe_name_from_syntax(talloc_tos(),
&p->syntax)));
set_incoming_fault(p);
setup_fault_pdu(p, NT_STATUS(DCERPC_FAULT_OP_RNG_ERROR));
TALLOC_FREE(pkt);
} else {
/*
* Reset the lengths. We're ready for a new pdu.
*/
TALLOC_FREE(p->in_data.pdu.data);
p->in_data.pdu_needed_len = 0;
p->in_data.pdu.length = 0;
}
TALLOC_FREE(pkt);
}
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