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samba-mirror/source3/rpc_server/srv_lsa_hnd.c

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/*
* Unix SMB/CIFS implementation.
* RPC Pipe client / server routines
* Copyright (C) Andrew Tridgell 1992-1997,
* Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
* Copyright (C) Jeremy Allison 2001.
*
* 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/>.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV
/*
* Handle database - stored per pipe.
*/
struct policy {
struct policy *next, *prev;
struct policy_handle pol_hnd;
uint32_t access_granted;
void *data_ptr;
};
struct handle_list {
struct policy *Policy; /* List of policies. */
size_t count; /* Current number of handles. */
size_t pipe_ref_count; /* Number of pipe handles referring to this list. */
};
/* This is the max handles across all instances of a pipe name. */
#ifndef MAX_OPEN_POLS
#define MAX_OPEN_POLS 2048
#endif
/****************************************************************************
Hack as handles need to be persisant over lsa pipe closes so long as a samr
pipe is open. JRA.
****************************************************************************/
static bool is_samr_lsa_pipe(const struct ndr_syntax_id *syntax)
{
return (ndr_syntax_id_equal(syntax, &ndr_table_samr.syntax_id)
|| ndr_syntax_id_equal(syntax, &ndr_table_lsarpc.syntax_id));
}
size_t num_pipe_handles(struct handle_list *list)
{
if (list == NULL) {
return 0;
}
return list->count;
}
/****************************************************************************
Initialise a policy handle list on a pipe. Handle list is shared between all
pipes of the same name.
****************************************************************************/
bool init_pipe_handle_list(pipes_struct *p, const struct ndr_syntax_id *syntax)
{
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pipes_struct *plist;
struct handle_list *hl;
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for (plist = get_first_internal_pipe();
plist;
plist = get_next_internal_pipe(plist)) {
if (ndr_syntax_id_equal(syntax, &plist->syntax)) {
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break;
}
if (is_samr_lsa_pipe(&plist->syntax)
&& is_samr_lsa_pipe(syntax)) {
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/*
* samr and lsa share a handle space (same process
* under Windows?)
*/
break;
}
}
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if (plist != NULL) {
hl = plist->pipe_handles;
if (hl == NULL) {
return false;
}
} else {
/*
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* First open, we have to create the handle list
*/
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hl = SMB_MALLOC_P(struct handle_list);
if (hl == NULL) {
return false;
}
ZERO_STRUCTP(hl);
DEBUG(10,("init_pipe_handles: created handle list for "
"pipe %s\n", get_pipe_name_from_iface(syntax)));
}
/*
* One more pipe is using this list.
*/
hl->pipe_ref_count++;
/*
* Point this pipe at this list.
*/
p->pipe_handles = hl;
DEBUG(10,("init_pipe_handles: pipe_handles ref count = %lu for pipe %s\n",
(unsigned long)p->pipe_handles->pipe_ref_count,
get_pipe_name_from_iface(syntax)));
return True;
}
/****************************************************************************
find first available policy slot. creates a policy handle for you.
If "data_ptr" is given, this must be a talloc'ed object, create_policy_hnd
talloc_moves this into the handle. If the policy_hnd is closed,
data_ptr is TALLOC_FREE()'ed
****************************************************************************/
static struct policy *create_policy_hnd_internal(pipes_struct *p,
struct policy_handle *hnd,
void *data_ptr)
{
static uint32 pol_hnd_low = 0;
static uint32 pol_hnd_high = 0;
time_t t = time(NULL);
struct policy *pol;
if (p->pipe_handles->count > MAX_OPEN_POLS) {
DEBUG(0,("create_policy_hnd: ERROR: too many handles (%d) on this pipe.\n",
(int)p->pipe_handles->count));
return NULL;
}
pol = TALLOC_ZERO_P(NULL, struct policy);
if (!pol) {
DEBUG(0,("create_policy_hnd: ERROR: out of memory!\n"));
return NULL;
}
if (data_ptr != NULL) {
pol->data_ptr = talloc_move(pol, &data_ptr);
}
pol_hnd_low++;
if (pol_hnd_low == 0)
(pol_hnd_high)++;
SIVAL(&pol->pol_hnd.handle_type, 0 , 0); /* first bit must be null */
SIVAL(&pol->pol_hnd.uuid.time_low, 0 , pol_hnd_low ); /* second bit is incrementing */
SSVAL(&pol->pol_hnd.uuid.time_mid, 0 , pol_hnd_high); /* second bit is incrementing */
SSVAL(&pol->pol_hnd.uuid.time_hi_and_version, 0 , (pol_hnd_high>>16)); /* second bit is incrementing */
/* split the current time into two 16 bit values */
SSVAL(pol->pol_hnd.uuid.clock_seq, 0, (t>>16)); /* something random */
SSVAL(pol->pol_hnd.uuid.node, 0, t); /* something random */
SIVAL(pol->pol_hnd.uuid.node, 2, sys_getpid()); /* something more random */
DLIST_ADD(p->pipe_handles->Policy, pol);
p->pipe_handles->count++;
*hnd = pol->pol_hnd;
DEBUG(4,("Opened policy hnd[%d] ", (int)p->pipe_handles->count));
dump_data(4, (uint8 *)hnd, sizeof(*hnd));
return pol;
}
bool create_policy_hnd(pipes_struct *p, struct policy_handle *hnd,
void *data_ptr)
{
return create_policy_hnd_internal(p, hnd, data_ptr) != NULL;
}
/****************************************************************************
find policy by handle - internal version.
****************************************************************************/
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static struct policy *find_policy_by_hnd_internal(pipes_struct *p,
const struct policy_handle *hnd,
void **data_p)
{
struct policy *pol;
size_t i;
if (data_p)
*data_p = NULL;
for (i = 0, pol=p->pipe_handles->Policy;pol;pol=pol->next, i++) {
if (memcmp(&pol->pol_hnd, hnd, sizeof(*hnd)) == 0) {
DEBUG(4,("Found policy hnd[%d] ", (int)i));
dump_data(4, (uint8 *)hnd, sizeof(*hnd));
if (data_p)
*data_p = pol->data_ptr;
return pol;
}
}
DEBUG(4,("Policy not found: "));
dump_data(4, (uint8 *)hnd, sizeof(*hnd));
p->bad_handle_fault_state = True;
return NULL;
}
/****************************************************************************
find policy by handle
****************************************************************************/
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bool find_policy_by_hnd(pipes_struct *p, const struct policy_handle *hnd,
void **data_p)
{
return find_policy_by_hnd_internal(p, hnd, data_p) == NULL ? False : True;
}
/****************************************************************************
Close a policy.
****************************************************************************/
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bool close_policy_hnd(pipes_struct *p, struct policy_handle *hnd)
{
struct policy *pol = find_policy_by_hnd_internal(p, hnd, NULL);
if (!pol) {
DEBUG(3,("Error closing policy\n"));
return False;
}
DEBUG(3,("Closed policy\n"));
p->pipe_handles->count--;
DLIST_REMOVE(p->pipe_handles->Policy, pol);
TALLOC_FREE(pol);
return True;
}
/****************************************************************************
Close a pipe - free the handle list if it was the last pipe reference.
****************************************************************************/
void close_policy_by_pipe(pipes_struct *p)
{
p->pipe_handles->pipe_ref_count--;
if (p->pipe_handles->pipe_ref_count == 0) {
/*
* Last pipe open on this list - free the list.
*/
while (p->pipe_handles->Policy)
close_policy_hnd(p, &p->pipe_handles->Policy->pol_hnd);
p->pipe_handles->Policy = NULL;
p->pipe_handles->count = 0;
SAFE_FREE(p->pipe_handles);
DEBUG(10,("close_policy_by_pipe: deleted handle list for "
"pipe %s\n", get_pipe_name_from_iface(&p->syntax)));
}
}
/*******************************************************************
Shall we allow access to this rpc? Currently this function
implements the 'restrict anonymous' setting by denying access to
anonymous users if the restrict anonymous level is > 0. Further work
will be checking a security descriptor to determine whether a user
token has enough access to access the pipe.
********************************************************************/
bool pipe_access_check(pipes_struct *p)
{
/* Don't let anonymous users access this RPC if restrict
anonymous > 0 */
if (lp_restrict_anonymous() > 0) {
/* schannel, so we must be ok */
if (p->pipe_bound && (p->auth.auth_type == PIPE_AUTH_TYPE_SCHANNEL)) {
return True;
}
if (p->server_info->guest) {
return False;
}
}
return True;
}
void *_policy_handle_create(struct pipes_struct *p, struct policy_handle *hnd,
uint32_t access_granted, size_t data_size,
const char *type, NTSTATUS *pstatus)
{
struct policy *pol;
void *data;
if (p->pipe_handles->count > MAX_OPEN_POLS) {
DEBUG(0, ("policy_handle_create: ERROR: too many handles (%d) "
"on pipe %s.\n", (int)p->pipe_handles->count,
get_pipe_name_from_iface(&p->syntax)));
*pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
return NULL;
}
data = talloc_size(talloc_tos(), data_size);
if (data == NULL) {
*pstatus = NT_STATUS_NO_MEMORY;
return NULL;
}
talloc_set_name_const(data, type);
pol = create_policy_hnd_internal(p, hnd, data);
if (pol == NULL) {
TALLOC_FREE(data);
*pstatus = NT_STATUS_NO_MEMORY;
return NULL;
}
pol->access_granted = access_granted;
*pstatus = NT_STATUS_OK;
return data;
}
void *_policy_handle_find(struct pipes_struct *p,
const struct policy_handle *hnd,
uint32_t access_required,
uint32_t *paccess_granted,
const char *name, const char *location,
NTSTATUS *pstatus)
{
struct policy *pol;
void *data;
pol = find_policy_by_hnd_internal(p, hnd, &data);
if (pol == NULL) {
*pstatus = NT_STATUS_INVALID_HANDLE;
return NULL;
}
if (strcmp(name, talloc_get_name(data)) != 0) {
DEBUG(10, ("expected %s, got %s\n", name,
talloc_get_name(data)));
*pstatus = NT_STATUS_INVALID_HANDLE;
return NULL;
}
if ((access_required & pol->access_granted) != access_required) {
if (geteuid() == sec_initial_uid()) {
DEBUG(4, ("%s: ACCESS should be DENIED (granted: "
"%#010x; required: %#010x)\n", location,
pol->access_granted, access_required));
DEBUGADD(4,("but overwritten by euid == 0\n"));
goto okay;
}
DEBUG(2,("%s: ACCESS DENIED (granted: %#010x; required: "
"%#010x)\n", location, pol->access_granted,
access_required));
*pstatus = NT_STATUS_ACCESS_DENIED;
return NULL;
}
okay:
DEBUG(10, ("found handle of type %s\n", talloc_get_name(data)));
if (paccess_granted != NULL) {
*paccess_granted = pol->access_granted;
}
*pstatus = NT_STATUS_OK;
return data;
}