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86fdb4c152
We update privileges on a per-record basis instead of all at once, as this maintains maximum compatibility is someone uses old tools with a new version of Samba. The also auto-detects the byte order of the old entries in the database, and copes with either native or reversed byte order. Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
497 lines
13 KiB
C
497 lines
13 KiB
C
/*
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Unix SMB/CIFS implementation.
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Privileges handling functions
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Copyright (C) Jean François Micouleau 1998-2001
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Copyright (C) Simo Sorce 2002-2003
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Copyright (C) Gerald (Jerry) Carter 2005
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Copyright (C) Michael Adam 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "dbwrap.h"
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#define PRIVPREFIX "PRIV_"
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typedef struct {
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uint32_t count;
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struct dom_sid *list;
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} SID_LIST;
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typedef struct {
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TALLOC_CTX *mem_ctx;
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uint64_t privilege;
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SID_LIST sids;
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} PRIV_SID_LIST;
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/*
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interpret an old style SE_PRIV structure
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*/
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static uint64_t map_old_SE_PRIV(unsigned char *dptr)
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{
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uint32_t *old_masks = (uint32_t *)dptr;
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/*
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* the old privileges code only ever used up to 0x800, except
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* for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
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*/
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if (old_masks[0] == 0xFFFFFFFF) {
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/* they set all privileges */
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return SE_ALL_PRIVS;
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}
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/* the old code used the machine byte order, but we don't know
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* the byte order of the machine that wrote it. However we can
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* tell what byte order it was by taking advantage of the fact
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* that it only ever use up to 0x800
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*/
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if (dptr[0] || dptr[1]) {
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/* it was little endian */
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return IVAL(dptr, 0);
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}
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/* it was either zero or big-endian */
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return RIVAL(dptr, 0);
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}
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static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
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{
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struct db_context *db = get_account_pol_db();
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fstring tmp, keystr;
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TDB_DATA data;
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/* Fail if the admin has not enable privileges */
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if ( !lp_enable_privileges() ) {
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return False;
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}
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if ( db == NULL )
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return False;
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/* PRIV_<SID> (NULL terminated) as the key */
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fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
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data = dbwrap_fetch_bystring( db, talloc_tos(), keystr );
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if ( !data.dptr ) {
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DEBUG(3, ("get_privileges: No privileges assigned to SID "
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"[%s]\n", sid_string_dbg(sid)));
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return False;
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}
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if (data.dsize == 4*4) {
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/* it's an old style SE_PRIV structure. */
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*mask = map_old_SE_PRIV(data.dptr);
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} else {
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if (data.dsize != sizeof( uint64_t ) ) {
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DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
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"[%s]\n", sid_string_dbg(sid)));
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return False;
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}
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*mask = BVAL(data.dptr, 0);
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}
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TALLOC_FREE(data.dptr);
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return True;
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}
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/***************************************************************************
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Store the privilege mask (set) for a given SID
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****************************************************************************/
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static bool set_privileges( const struct dom_sid *sid, uint64_t *mask )
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{
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struct db_context *db = get_account_pol_db();
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uint8_t privbuf[8];
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fstring tmp, keystr;
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TDB_DATA data;
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if ( !lp_enable_privileges() )
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return False;
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if ( db == NULL )
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return False;
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if ( !sid || (sid->num_auths == 0) ) {
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DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
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return False;
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}
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/* PRIV_<SID> (NULL terminated) as the key */
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fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
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/* This writes the 64 bit bitmask out in little endian format */
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SBVAL(privbuf,0,*mask);
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data.dptr = privbuf;
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data.dsize = sizeof(privbuf);
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return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
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TDB_REPLACE));
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}
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/*********************************************************************
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get a list of all privileges for all sids in the list
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*********************************************************************/
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bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
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{
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uint64_t mask;
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int i;
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bool found = False;
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*privileges = 0;
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for ( i=0; i<scount; i++ ) {
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/* don't add unless we actually have a privilege assigned */
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if ( !get_privileges( &slist[i], &mask ) )
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continue;
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DEBUG(5,("get_privileges_for_sids: sid = %s\nPrivilege "
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"set: 0x%llx\n", sid_string_dbg(&slist[i]),
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(unsigned long long)mask));
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*privileges |= mask;
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found = True;
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}
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return found;
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}
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NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
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{
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uint64_t mask;
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if (!get_privileges(sid, &mask)) {
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return NT_STATUS_OBJECT_NAME_NOT_FOUND;
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}
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*privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
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if (!*privileges) {
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return NT_STATUS_NO_MEMORY;
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}
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if (!se_priv_to_privilege_set(*privileges, mask)) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_OK;
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}
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/*********************************************************************
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traversal functions for privilege_enumerate_accounts
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*********************************************************************/
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static int priv_traverse_fn(struct db_record *rec, void *state)
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{
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PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
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int prefixlen = strlen(PRIVPREFIX);
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struct dom_sid sid;
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fstring sid_string;
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/* check we have a PRIV_+SID entry */
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if ( strncmp((char *)rec->key.dptr, PRIVPREFIX, prefixlen) != 0)
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return 0;
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/* check to see if we are looking for a particular privilege */
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fstrcpy( sid_string, (char *)&(rec->key.dptr[strlen(PRIVPREFIX)]) );
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if (priv->privilege != 0) {
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uint64_t mask;
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if (rec->value.dsize == 4*4) {
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mask = map_old_SE_PRIV(rec->value.dptr);
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} else {
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if (rec->value.dsize != sizeof( uint64_t ) ) {
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DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
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"[%s]\n", sid_string));
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return 0;
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}
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mask = BVAL(rec->value.dptr, 0);
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}
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/* if the SID does not have the specified privilege
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then just return */
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if ((mask & priv->privilege) == 0) {
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return 0;
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}
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}
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/* this is a last ditch safety check to preventing returning
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and invalid SID (i've somehow run into this on development branches) */
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if ( strcmp( "S-0-0", sid_string ) == 0 )
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return 0;
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if ( !string_to_sid(&sid, sid_string) ) {
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DEBUG(0,("travsersal_fn_enum__acct: Could not convert SID [%s]\n",
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sid_string));
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return 0;
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}
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if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
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&priv->sids.list,
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&priv->sids.count)))
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{
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return 0;
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}
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return 0;
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}
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/*********************************************************************
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Retreive list of privileged SIDs (for _lsa_enumerate_accounts()
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*********************************************************************/
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NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
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{
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struct db_context *db = get_account_pol_db();
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PRIV_SID_LIST priv;
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if (db == NULL) {
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return NT_STATUS_ACCESS_DENIED;
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}
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ZERO_STRUCT(priv);
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db->traverse_read(db, priv_traverse_fn, &priv);
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/* give the memory away; caller will free */
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*sids = priv.sids.list;
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*num_sids = priv.sids.count;
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return NT_STATUS_OK;
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}
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/*********************************************************************
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Retrieve list of SIDs granted a particular privilege
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*********************************************************************/
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NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
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struct dom_sid **sids, int *num_sids)
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{
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struct db_context *db = get_account_pol_db();
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PRIV_SID_LIST priv;
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if (db == NULL) {
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return NT_STATUS_ACCESS_DENIED;
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}
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ZERO_STRUCT(priv);
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priv.privilege = sec_privilege_mask(privilege);
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priv.mem_ctx = mem_ctx;
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db->traverse_read(db, priv_traverse_fn, &priv);
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/* give the memory away; caller will free */
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*sids = priv.sids.list;
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*num_sids = priv.sids.count;
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return NT_STATUS_OK;
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}
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/***************************************************************************
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Add privilege to sid
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****************************************************************************/
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static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
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{
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uint64_t old_mask, new_mask;
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ZERO_STRUCT( old_mask );
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ZERO_STRUCT( new_mask );
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if ( get_privileges( sid, &old_mask ) )
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new_mask = old_mask;
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else
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new_mask = 0;
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new_mask |= priv_mask;
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DEBUG(10,("grant_privilege: %s\n", sid_string_dbg(sid)));
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DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
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DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)new_mask));
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return set_privileges( sid, &new_mask );
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}
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/*********************************************************************
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Add a privilege based on its name
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*********************************************************************/
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bool grant_privilege_by_name(struct dom_sid *sid, const char *name)
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{
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uint64_t mask;
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if (! se_priv_from_name(name, &mask)) {
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DEBUG(3, ("grant_privilege_by_name: "
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"No Such Privilege Found (%s)\n", name));
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return False;
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}
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return grant_privilege_bitmap( sid, mask );
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}
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/***************************************************************************
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Grant a privilege set (list of LUID values) from a sid
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****************************************************************************/
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bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
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{
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uint64_t privilege_mask;
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if (!privilege_set_to_se_priv(&privilege_mask, set)) {
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return false;
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}
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return grant_privilege_bitmap(sid, privilege_mask);
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}
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/***************************************************************************
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Remove privilege from sid
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****************************************************************************/
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static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
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{
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uint64_t mask;
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/* if the user has no privileges, then we can't revoke any */
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if ( !get_privileges( sid, &mask ) )
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return True;
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DEBUG(10,("revoke_privilege: %s\n", sid_string_dbg(sid)));
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DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
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mask &= ~priv_mask;
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DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)mask));
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return set_privileges( sid, &mask );
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}
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/***************************************************************************
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Remove a privilege set (list of LUID values) from a sid
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****************************************************************************/
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bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
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{
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uint64_t privilege_mask;
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if (!privilege_set_to_se_priv(&privilege_mask, set)) {
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return false;
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}
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return revoke_privilege_bitmap(sid, privilege_mask);
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}
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/*********************************************************************
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Revoke all privileges
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*********************************************************************/
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bool revoke_all_privileges( struct dom_sid *sid )
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{
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return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
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}
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/*********************************************************************
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Add a privilege based on its name
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*********************************************************************/
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bool revoke_privilege_by_name(struct dom_sid *sid, const char *name)
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{
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uint64_t mask;
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if (! se_priv_from_name(name, &mask)) {
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DEBUG(3, ("revoke_privilege_by_name: "
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"No Such Privilege Found (%s)\n", name));
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return False;
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}
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return revoke_privilege_bitmap(sid, mask);
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}
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/***************************************************************************
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Retrieve the SIDs assigned to a given privilege
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****************************************************************************/
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NTSTATUS privilege_create_account(const struct dom_sid *sid )
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{
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return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
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}
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/***************************************************************************
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Delete a privileged account
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****************************************************************************/
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NTSTATUS privilege_delete_account(const struct dom_sid *sid)
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{
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struct db_context *db = get_account_pol_db();
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fstring tmp, keystr;
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if (!lp_enable_privileges()) {
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return NT_STATUS_OK;
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}
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if (!db) {
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return NT_STATUS_INVALID_HANDLE;
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}
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if (!sid || (sid->num_auths == 0)) {
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return NT_STATUS_INVALID_SID;
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}
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/* PRIV_<SID> (NULL terminated) as the key */
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fstr_sprintf(keystr, "%s%s", PRIVPREFIX, sid_to_fstring(tmp, sid));
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return dbwrap_delete_bystring(db, keystr);
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}
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/*******************************************************************
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*******************************************************************/
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bool is_privileged_sid( const struct dom_sid *sid )
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{
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uint64_t mask;
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return get_privileges( sid, &mask );
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}
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/*******************************************************************
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*******************************************************************/
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bool grant_all_privileges( const struct dom_sid *sid )
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{
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uint64_t mask;
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if (!se_priv_put_all_privileges(&mask)) {
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return False;
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}
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return grant_privilege_bitmap( sid, mask );
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}
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