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-rw-r--r--source3/lib/privileges.c517
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diff --git a/source3/lib/privileges.c b/source3/lib/privileges.c
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+/*
+ Unix SMB/CIFS implementation.
+ Privileges handling functions
+ Copyright (C) Jean François Micouleau 1998-2001
+ Copyright (C) Simo Sorce 2002-2003
+ Copyright (C) Gerald (Jerry) Carter 2005
+ Copyright (C) Michael Adam 2007
+
+ 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"
+#include "lib/privileges.h"
+#include "dbwrap/dbwrap.h"
+#include "libcli/security/privileges_private.h"
+#include "../libcli/security/security.h"
+#include "passdb.h"
+#include "lib/util/string_wrappers.h"
+
+#define PRIVPREFIX "PRIV_"
+
+typedef struct {
+ uint32_t count;
+ struct dom_sid *list;
+} SID_LIST;
+
+typedef struct {
+ TALLOC_CTX *mem_ctx;
+ uint64_t privilege;
+ SID_LIST sids;
+} PRIV_SID_LIST;
+
+/*
+ interpret an old style SE_PRIV structure
+ */
+static uint64_t map_old_SE_PRIV(unsigned char *dptr)
+{
+ uint32_t *old_masks = (uint32_t *)dptr;
+ /*
+ * the old privileges code only ever used up to 0x800, except
+ * for a special case of 'SE_ALL_PRIVS' which was 0xFFFFFFFF
+ */
+ if (old_masks[0] == 0xFFFFFFFF) {
+ /* they set all privileges */
+ return SE_ALL_PRIVS;
+ }
+
+ /* the old code used the machine byte order, but we don't know
+ * the byte order of the machine that wrote it. However we can
+ * tell what byte order it was by taking advantage of the fact
+ * that it only ever use up to 0x800
+ */
+ if (dptr[0] || dptr[1]) {
+ /* it was little endian */
+ return IVAL(dptr, 0);
+ }
+
+ /* it was either zero or big-endian */
+ return RIVAL(dptr, 0);
+}
+
+
+static bool get_privileges( const struct dom_sid *sid, uint64_t *mask )
+{
+ struct db_context *db = get_account_pol_db();
+ struct dom_sid_buf tmp;
+ fstring keystr;
+ TDB_DATA data;
+ NTSTATUS status;
+
+ /* Fail if the admin has not enable privileges */
+
+ if ( !lp_enable_privileges() ) {
+ return False;
+ }
+
+ if ( db == NULL )
+ return False;
+
+ /* PRIV_<SID> (NULL terminated) as the key */
+
+ fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
+
+ status = dbwrap_fetch_bystring(db, talloc_tos(), keystr, &data);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(4, ("get_privileges: No privileges assigned to SID "
+ "[%s]\n", tmp.buf));
+ return False;
+ }
+
+ if (data.dsize == 4*4) {
+ /* it's an old style SE_PRIV structure. */
+ *mask = map_old_SE_PRIV(data.dptr);
+ } else {
+ if (data.dsize != sizeof( uint64_t ) ) {
+ DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
+ "[%s]\n", tmp.buf));
+ return False;
+ }
+
+ *mask = BVAL(data.dptr, 0);
+ }
+
+ TALLOC_FREE(data.dptr);
+
+ return True;
+}
+
+/***************************************************************************
+ Store the privilege mask (set) for a given SID
+****************************************************************************/
+
+static bool set_privileges( const struct dom_sid *sid, uint64_t mask )
+{
+ struct db_context *db = get_account_pol_db();
+ uint8_t privbuf[8];
+ struct dom_sid_buf tmp;
+ fstring keystr;
+ TDB_DATA data = { .dptr = privbuf, .dsize = sizeof(privbuf), };
+
+ if ( !lp_enable_privileges() )
+ return False;
+
+ if ( db == NULL )
+ return False;
+
+ if ( !sid || (sid->num_auths == 0) ) {
+ DEBUG(0,("set_privileges: Refusing to store empty SID!\n"));
+ return False;
+ }
+
+ /* PRIV_<SID> (NULL terminated) as the key */
+
+ fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
+
+ /* This writes the 64 bit bitmask out in little endian format */
+ SBVAL(privbuf,0,mask);
+
+ return NT_STATUS_IS_OK(dbwrap_store_bystring(db, keystr, data,
+ TDB_REPLACE));
+}
+
+/*********************************************************************
+ get a list of all privileges for all sids in the list
+*********************************************************************/
+
+bool get_privileges_for_sids(uint64_t *privileges, struct dom_sid *slist, int scount)
+{
+ uint64_t mask;
+ int i;
+ bool found = False;
+
+ *privileges = 0;
+
+ for ( i=0; i<scount; i++ ) {
+ struct dom_sid_buf buf;
+
+ /* don't add unless we actually have a privilege assigned */
+
+ if ( !get_privileges( &slist[i], &mask ) )
+ continue;
+
+ DBG_INFO("sid = %s\nPrivilege set: 0x%"PRIx64"\n",
+ dom_sid_str_buf(&slist[i], &buf),
+ mask);
+
+ *privileges |= mask;
+ found = True;
+ }
+
+ return found;
+}
+
+NTSTATUS get_privileges_for_sid_as_set(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **privileges, struct dom_sid *sid)
+{
+ uint64_t mask;
+ if (!get_privileges(sid, &mask)) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ *privileges = talloc_zero(mem_ctx, PRIVILEGE_SET);
+ if (!*privileges) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (!se_priv_to_privilege_set(*privileges, mask)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ return NT_STATUS_OK;
+}
+
+/*********************************************************************
+ traversal functions for privilege_enumerate_accounts
+*********************************************************************/
+
+static int priv_traverse_fn(struct db_record *rec, void *state)
+{
+ PRIV_SID_LIST *priv = (PRIV_SID_LIST *)state;
+ int prefixlen = strlen(PRIVPREFIX);
+ struct dom_sid sid;
+ fstring sid_string;
+ TDB_DATA key;
+
+ key = dbwrap_record_get_key(rec);
+
+ /* check we have a PRIV_+SID entry */
+
+ if (strncmp((char *)key.dptr, PRIVPREFIX, prefixlen) != 0)
+ return 0;
+
+ /* check to see if we are looking for a particular privilege */
+
+ fstrcpy( sid_string, (char *)&(key.dptr[strlen(PRIVPREFIX)]) );
+
+ if (priv->privilege != 0) {
+ uint64_t mask;
+ TDB_DATA value;
+
+ value = dbwrap_record_get_value(rec);
+
+ if (value.dsize == 4*4) {
+ mask = map_old_SE_PRIV(value.dptr);
+ } else {
+ if (value.dsize != sizeof( uint64_t ) ) {
+ DEBUG(3, ("get_privileges: Invalid privileges record assigned to SID "
+ "[%s]\n", sid_string));
+ return 0;
+ }
+ mask = BVAL(value.dptr, 0);
+ }
+
+ /* if the SID does not have the specified privilege
+ then just return */
+
+ if ((mask & priv->privilege) == 0) {
+ return 0;
+ }
+ }
+
+ /* this is a last ditch safety check to preventing returning
+ and invalid SID (i've somehow run into this on development branches) */
+
+ if ( strcmp( "S-0-0", sid_string ) == 0 )
+ return 0;
+
+ if ( !string_to_sid(&sid, sid_string) ) {
+ DBG_WARNING("Could not convert SID [%s]\n", sid_string);
+ return 0;
+ }
+
+ if (!NT_STATUS_IS_OK(add_sid_to_array(priv->mem_ctx, &sid,
+ &priv->sids.list,
+ &priv->sids.count)))
+ {
+ return 0;
+ }
+
+ return 0;
+}
+
+/*********************************************************************
+ Retrieve list of privileged SIDs (for _lsa_enumerate_accounts()
+*********************************************************************/
+
+NTSTATUS privilege_enumerate_accounts(struct dom_sid **sids, int *num_sids)
+{
+ struct db_context *db = get_account_pol_db();
+ PRIV_SID_LIST priv;
+ NTSTATUS status;
+
+ if (db == NULL) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ ZERO_STRUCT(priv);
+
+ status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ /* give the memory away; caller will free */
+
+ *sids = priv.sids.list;
+ *num_sids = priv.sids.count;
+
+ return NT_STATUS_OK;
+}
+
+/*********************************************************************
+ Retrieve list of SIDs granted a particular privilege
+*********************************************************************/
+
+NTSTATUS privilege_enum_sids(enum sec_privilege privilege, TALLOC_CTX *mem_ctx,
+ struct dom_sid **sids, int *num_sids)
+{
+ struct db_context *db = get_account_pol_db();
+ PRIV_SID_LIST priv;
+ NTSTATUS status;
+
+ if (db == NULL) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ ZERO_STRUCT(priv);
+
+ priv.privilege = sec_privilege_mask(privilege);
+ priv.mem_ctx = mem_ctx;
+
+ status = dbwrap_traverse_read(db, priv_traverse_fn, &priv, NULL);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ /* give the memory away; caller will free */
+
+ *sids = priv.sids.list;
+ *num_sids = priv.sids.count;
+
+ return NT_STATUS_OK;
+}
+
+/***************************************************************************
+ Add privilege to sid
+****************************************************************************/
+
+static bool grant_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
+{
+ uint64_t old_mask, new_mask;
+ struct dom_sid_buf buf;
+
+ ZERO_STRUCT( old_mask );
+ ZERO_STRUCT( new_mask );
+
+ if ( get_privileges( sid, &old_mask ) )
+ new_mask = old_mask;
+ else
+ new_mask = 0;
+
+ new_mask |= priv_mask;
+
+ DEBUG(10,("grant_privilege: %s\n", dom_sid_str_buf(sid, &buf)));
+
+ DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)new_mask));
+
+ DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)new_mask));
+
+ return set_privileges( sid, new_mask );
+}
+
+/*********************************************************************
+ Add a privilege based on its name
+*********************************************************************/
+
+bool grant_privilege_by_name(const struct dom_sid *sid, const char *name)
+{
+ uint64_t mask;
+
+ if (! se_priv_from_name(name, &mask)) {
+ DEBUG(3, ("grant_privilege_by_name: "
+ "No Such Privilege Found (%s)\n", name));
+ return False;
+ }
+
+ return grant_privilege_bitmap( sid, mask );
+}
+
+/***************************************************************************
+ Grant a privilege set (list of LUID values) from a sid
+****************************************************************************/
+
+bool grant_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
+{
+ uint64_t privilege_mask;
+ if (!privilege_set_to_se_priv(&privilege_mask, set)) {
+ return false;
+ }
+ return grant_privilege_bitmap(sid, privilege_mask);
+}
+
+/***************************************************************************
+ Remove privilege from sid
+****************************************************************************/
+
+static bool revoke_privilege_bitmap(const struct dom_sid *sid, const uint64_t priv_mask)
+{
+ uint64_t mask;
+ struct dom_sid_buf buf;
+
+ /* if the user has no privileges, then we can't revoke any */
+
+ if ( !get_privileges( sid, &mask ) )
+ return True;
+
+ DEBUG(10,("revoke_privilege: %s\n", dom_sid_str_buf(sid, &buf)));
+
+ DEBUGADD( 10, ("original privilege mask: 0x%llx\n", (unsigned long long)mask));
+
+ mask &= ~priv_mask;
+
+ DEBUGADD( 10, ("new privilege mask: 0x%llx\n", (unsigned long long)mask));
+
+ return set_privileges( sid, mask );
+}
+
+/***************************************************************************
+ Remove a privilege set (list of LUID values) from a sid
+****************************************************************************/
+
+bool revoke_privilege_set(const struct dom_sid *sid, struct lsa_PrivilegeSet *set)
+{
+ uint64_t privilege_mask;
+ if (!privilege_set_to_se_priv(&privilege_mask, set)) {
+ return false;
+ }
+ return revoke_privilege_bitmap(sid, privilege_mask);
+}
+
+/*********************************************************************
+ Revoke all privileges
+*********************************************************************/
+
+bool revoke_all_privileges( const struct dom_sid *sid )
+{
+ return revoke_privilege_bitmap( sid, SE_ALL_PRIVS);
+}
+
+/*********************************************************************
+ Add a privilege based on its name
+*********************************************************************/
+
+bool revoke_privilege_by_name(const struct dom_sid *sid, const char *name)
+{
+ uint64_t mask;
+
+ if (! se_priv_from_name(name, &mask)) {
+ DEBUG(3, ("revoke_privilege_by_name: "
+ "No Such Privilege Found (%s)\n", name));
+ return False;
+ }
+
+ return revoke_privilege_bitmap(sid, mask);
+
+}
+
+/***************************************************************************
+ Retrieve the SIDs assigned to a given privilege
+****************************************************************************/
+
+NTSTATUS privilege_create_account(const struct dom_sid *sid )
+{
+ return ( grant_privilege_bitmap(sid, 0) ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL);
+}
+
+/***************************************************************************
+ Delete a privileged account
+****************************************************************************/
+
+NTSTATUS privilege_delete_account(const struct dom_sid *sid)
+{
+ struct db_context *db = get_account_pol_db();
+ struct dom_sid_buf tmp;
+ fstring keystr;
+
+ if (!lp_enable_privileges()) {
+ return NT_STATUS_OK;
+ }
+
+ if (!db) {
+ return NT_STATUS_INVALID_HANDLE;
+ }
+
+ if (!sid || (sid->num_auths == 0)) {
+ return NT_STATUS_INVALID_SID;
+ }
+
+ /* PRIV_<SID> (NULL terminated) as the key */
+
+ fstr_sprintf(keystr, "%s%s", PRIVPREFIX, dom_sid_str_buf(sid, &tmp));
+
+ return dbwrap_delete_bystring(db, keystr);
+}
+
+/*******************************************************************
+*******************************************************************/
+
+bool is_privileged_sid( const struct dom_sid *sid )
+{
+ uint64_t mask;
+
+ return get_privileges( sid, &mask );
+}
+
+/*******************************************************************
+*******************************************************************/
+
+bool grant_all_privileges( const struct dom_sid *sid )
+{
+ uint64_t mask;
+
+ se_priv_put_all_privileges(&mask);
+
+ return grant_privilege_bitmap( sid, mask );
+}
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