s3-privs Move source3/ privileges implmentation into common

Andrew Bartlett

Signed-off-by: Andrew Tridgell <tridge@samba.org>

1 files changed, 457 insertions, 0 deletions

diff --git a/libcli/security/privileges.c b/libcli/security/privileges.c
new file mode 100644
index 0000000000..ca2b4fef8d
--- /dev/null
+++ b/libcli/security/privileges.c
@@ -0,0 +1,457 @@
+/*
+   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
+   Copyright (C) Andrew Bartlett		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/>.
+*/
+
+/*
+ * Basic privileges functions (mask-operations and conversion
+ * functions between the different formats (se_priv, privset, luid)
+ * moved here * from lib/privileges.c to minimize linker deps.
+ *
+ * generally SID- and LUID-related code is left in lib/privileges.c
+ *
+ * some extra functions to hide privs array from lib/privileges.c
+ */
+
+#include "includes.h"
+
+const uint64_t se_priv_all         = SE_ALL_PRIVS;
+static const uint64_t se_priv_end  = SE_END;
+
+/* Define variables for all privileges so we can use the
+   uint64_t* in the various se_priv_XXX() functions */
+
+const uint64_t se_priv_none       = SE_NONE;
+const uint64_t se_machine_account = SE_MACHINE_ACCOUNT;
+const uint64_t se_print_operator  = SE_PRINT_OPERATOR;
+const uint64_t se_add_users       = SE_ADD_USERS;
+const uint64_t se_disk_operators  = SE_DISK_OPERATOR;
+const uint64_t se_remote_shutdown = SE_REMOTE_SHUTDOWN;
+const uint64_t se_restore         = SE_RESTORE;
+const uint64_t se_take_ownership  = SE_TAKE_OWNERSHIP;
+
+PRIVS privs[] = {
+#if 0	/* usrmgr will display these twice if you include them.  We don't
+	   use them but we'll keep the bitmasks reserved in privileges.h anyways */
+
+	{SE_NETWORK_LOGON,	"SeNetworkLogonRight",		"Access this computer from network", 	   0x0},
+	{SE_INTERACTIVE_LOGON,	"SeInteractiveLogonRight",	"Log on locally", 			   0x0},
+	{SE_BATCH_LOGON,	"SeBatchLogonRight",		"Log on as a batch job",		   0x0},
+	{SE_SERVICE_LOGON,	"SeServiceLogonRight",		"Log on as a service",			   0x0},
+#endif
+	{SE_MACHINE_ACCOUNT,	"SeMachineAccountPrivilege",	"Add machines to domain",		   SEC_PRIV_MACHINE_ACCOUNT},
+	{SE_TAKE_OWNERSHIP,     "SeTakeOwnershipPrivilege",     "Take ownership of files or other objects",SEC_PRIV_TAKE_OWNERSHIP},
+        {SE_BACKUP,             "SeBackupPrivilege",            "Back up files and directories",	   SEC_PRIV_BACKUP},
+        {SE_RESTORE,            "SeRestorePrivilege",           "Restore files and directories",	   SEC_PRIV_RESTORE},
+	{SE_REMOTE_SHUTDOWN,	"SeRemoteShutdownPrivilege",	"Force shutdown from a remote system",	   SEC_PRIV_REMOTE_SHUTDOWN},
+
+	{SE_PRINT_OPERATOR,	"SePrintOperatorPrivilege",	"Manage printers",			   SEC_PRIV_PRINT_OPERATOR},
+	{SE_ADD_USERS,		"SeAddUsersPrivilege",		"Add users and groups to the domain",	   SEC_PRIV_ADD_USERS},
+	{SE_DISK_OPERATOR,	"SeDiskOperatorPrivilege",	"Manage disk shares",			   SEC_PRIV_DISK_OPERATOR},
+
+	{SE_END, "", "", 0x0}
+};
+
+/***************************************************************************
+ copy an uint64_t structure
+****************************************************************************/
+
+bool se_priv_copy( uint64_t *dst, const uint64_t *src )
+{
+	if ( !dst || !src )
+		return False;
+
+	memcpy( dst, src, sizeof(uint64_t) );
+
+	return True;
+}
+
+/***************************************************************************
+ put all privileges into a mask
+****************************************************************************/
+
+bool se_priv_put_all_privileges(uint64_t *privilege_mask)
+{
+	int i;
+	uint32 num_privs = count_all_privileges();
+
+	if (!se_priv_copy(privilege_mask, &se_priv_none)) {
+		return False;
+	}
+	for ( i=0; i<num_privs; i++ ) {
+		se_priv_add(privilege_mask, &privs[i].privilege_mask);
+	}
+	return True;
+}
+
+/***************************************************************************
+ combine 2 uint64_t structures and store the resulting set in mew_mask
+****************************************************************************/
+
+void se_priv_add( uint64_t *privilege_mask, const uint64_t *addpriv )
+{
+	*privilege_mask |= *addpriv;
+}
+
+/***************************************************************************
+ remove one uint64_t sytucture from another and store the resulting set
+ in mew_mask
+****************************************************************************/
+
+void se_priv_remove( uint64_t *privilege_mask, const uint64_t *removepriv )
+{
+	*privilege_mask &= ~*removepriv;
+}
+
+/***************************************************************************
+ invert a given uint64_t and store the set in new_mask
+****************************************************************************/
+
+static void se_priv_invert( uint64_t *new_mask, const uint64_t *privilege_mask )
+{
+	uint64_t allprivs;
+
+	se_priv_copy( &allprivs, &se_priv_all );
+	se_priv_remove( &allprivs, privilege_mask );
+	se_priv_copy( new_mask, &allprivs );
+}
+
+/***************************************************************************
+ check if 2 uint64_t structure are equal
+****************************************************************************/
+
+bool se_priv_equal( const uint64_t *privilege_mask1, const uint64_t *privilege_mask2 )
+{
+	return *privilege_mask1 == *privilege_mask2;
+}
+
+/***************************************************************************
+ check if a uint64_t has any assigned privileges
+****************************************************************************/
+
+static bool se_priv_empty( const uint64_t *privilege_mask )
+{
+	uint64_t p1;
+
+	se_priv_copy( &p1, privilege_mask );
+
+	p1 &= se_priv_all;
+
+	return se_priv_equal( &p1, &se_priv_none );
+}
+
+/*********************************************************************
+ Lookup the uint64_t value for a privilege name
+*********************************************************************/
+
+bool se_priv_from_name( const char *name, uint64_t *privilege_mask )
+{
+	int i;
+
+	for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
+		if ( strequal( privs[i].name, name ) ) {
+			se_priv_copy( privilege_mask, &privs[i].privilege_mask );
+			return True;
+		}
+	}
+
+	return False;
+}
+
+/***************************************************************************
+ dump an uint64_t structure to the log files
+****************************************************************************/
+
+void dump_se_priv( int dbg_cl, int dbg_lvl, const uint64_t *privilege_mask )
+{
+	DEBUGADDC( dbg_cl, dbg_lvl,("uint64_t 0x%llx\n", (unsigned long long)*privilege_mask));
+}
+
+/****************************************************************************
+ check if the privilege is in the privilege list
+****************************************************************************/
+
+bool is_privilege_assigned(const uint64_t *privileges,
+			   const uint64_t *check)
+{
+	uint64_t p1, p2;
+
+	if ( !privileges || !check )
+		return False;
+
+	/* everyone has privileges if you aren't checking for any */
+
+	if ( se_priv_empty( check ) ) {
+		DEBUG(1,("is_privilege_assigned: no privileges in check_mask!\n"));
+		return True;
+	}
+
+	se_priv_copy( &p1, check );
+
+	/* invert the uint64_t we want to check for and remove that from the
+	   original set.  If we are left with the uint64_t we are checking
+	   for then return True */
+
+	se_priv_invert( &p1, check );
+	se_priv_copy( &p2, privileges );
+	se_priv_remove( &p2, &p1 );
+
+	return se_priv_equal( &p2, check );
+}
+
+/****************************************************************************
+ check if the privilege is in the privilege list
+****************************************************************************/
+
+static bool is_any_privilege_assigned( uint64_t *privileges, const uint64_t *check )
+{
+	uint64_t p1, p2;
+
+	if ( !privileges || !check )
+		return False;
+
+	/* everyone has privileges if you aren't checking for any */
+
+	if ( se_priv_empty( check ) ) {
+		DEBUG(1,("is_any_privilege_assigned: no privileges in check_mask!\n"));
+		return True;
+	}
+
+	se_priv_copy( &p1, check );
+
+	/* invert the uint64_t we want to check for and remove that from the
+	   original set.  If we are left with the uint64_t we are checking
+	   for then return True */
+
+	se_priv_invert( &p1, check );
+	se_priv_copy( &p2, privileges );
+	se_priv_remove( &p2, &p1 );
+
+	/* see if we have any bits left */
+
+	return !se_priv_empty( &p2 );
+}
+
+/*********************************************************************
+ Generate the struct lsa_LUIDAttribute structure based on a bitmask
+*********************************************************************/
+
+const char* get_privilege_dispname( const char *name )
+{
+	int i;
+
+	if (!name) {
+		return NULL;
+	}
+
+	for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
+
+		if ( strequal( privs[i].name, name ) ) {
+			return privs[i].description;
+		}
+	}
+
+	return NULL;
+}
+
+/****************************************************************************
+ initialise a privilege list and set the talloc context
+ ****************************************************************************/
+
+/****************************************************************************
+ Does the user have the specified privilege ?  We only deal with one privilege
+ at a time here.
+*****************************************************************************/
+
+bool user_has_privileges(const struct security_token *token, const uint64_t *privilege_bit)
+{
+	if ( !token )
+		return False;
+
+	return is_privilege_assigned( &token->privilege_mask, privilege_bit );
+}
+
+/****************************************************************************
+ Does the user have any of the specified privileges ?  We only deal with one privilege
+ at a time here.
+*****************************************************************************/
+
+bool user_has_any_privilege(struct security_token *token, const uint64_t *privilege_mask)
+{
+	if ( !token )
+		return False;
+
+	return is_any_privilege_assigned( &token->privilege_mask, privilege_mask );
+}
+
+/*******************************************************************
+ return the number of elements in the privlege array
+*******************************************************************/
+
+int count_all_privileges( void )
+{
+	/*
+	 * The -1 is due to the weird SE_END record...
+	 */
+	return (sizeof(privs) / sizeof(privs[0])) - 1;
+}
+
+
+/*********************************************************************
+ Generate the struct lsa_LUIDAttribute structure based on a bitmask
+ The assumption here is that the privilege has already been validated
+ so we are guaranteed to find it in the list.
+*********************************************************************/
+
+struct lsa_LUIDAttribute get_privilege_luid( uint64_t *privilege_mask )
+{
+	struct lsa_LUIDAttribute priv_luid;
+	int i;
+
+	ZERO_STRUCT( priv_luid );
+
+	for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
+
+		if ( se_priv_equal( &privs[i].privilege_mask, privilege_mask ) ) {
+			priv_luid.luid.low = privs[i].luid;
+			priv_luid.luid.high = 0;
+			break;
+		}
+	}
+
+	return priv_luid;
+}
+
+/****************************************************************************
+ Convert a LUID to a named string
+****************************************************************************/
+
+const char *luid_to_privilege_name(const struct lsa_LUID *set)
+{
+	int i;
+
+	if (set->high != 0)
+		return NULL;
+
+	for ( i=0; !se_priv_equal(&privs[i].privilege_mask, &se_priv_end); i++ ) {
+		if ( set->low == privs[i].luid ) {
+			return privs[i].name;
+		}
+	}
+
+	return NULL;
+}
+
+
+/****************************************************************************
+ add a privilege to a privilege array
+ ****************************************************************************/
+
+static bool privilege_set_add(PRIVILEGE_SET *priv_set, struct lsa_LUIDAttribute set)
+{
+	struct lsa_LUIDAttribute *new_set;
+
+	/* we can allocate memory to add the new privilege */
+
+	new_set = TALLOC_REALLOC_ARRAY(priv_set->mem_ctx, priv_set->set, struct lsa_LUIDAttribute, priv_set->count + 1);
+	if ( !new_set ) {
+		DEBUG(0,("privilege_set_add: failed to allocate memory!\n"));
+		return False;
+	}
+
+	new_set[priv_set->count].luid.high = set.luid.high;
+	new_set[priv_set->count].luid.low = set.luid.low;
+	new_set[priv_set->count].attribute = set.attribute;
+
+	priv_set->count++;
+	priv_set->set = new_set;
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+bool se_priv_to_privilege_set( PRIVILEGE_SET *set, uint64_t *privilege_mask )
+{
+	int i;
+	uint32 num_privs = count_all_privileges();
+	struct lsa_LUIDAttribute luid;
+
+	luid.attribute = 0;
+	luid.luid.high = 0;
+
+	for ( i=0; i<num_privs; i++ ) {
+		if ( !is_privilege_assigned(privilege_mask, &privs[i].privilege_mask) )
+			continue;
+
+		luid.luid.high = 0;
+		luid.luid.low = privs[i].luid;
+
+		if ( !privilege_set_add( set, luid ) )
+			return False;
+	}
+
+	return True;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+static bool luid_to_se_priv( struct lsa_LUID *luid, uint64_t *privilege_mask )
+{
+	int i;
+	uint32 num_privs = count_all_privileges();
+
+	for ( i=0; i<num_privs; i++ ) {
+		if ( luid->low == privs[i].luid ) {
+			se_priv_copy( privilege_mask, &privs[i].privilege_mask );
+			return True;
+		}
+	}
+
+	return False;
+}
+
+/*******************************************************************
+*******************************************************************/
+
+bool privilege_set_to_se_priv( uint64_t *privilege_mask, struct lsa_PrivilegeSet *privset )
+{
+	int i;
+
+	ZERO_STRUCTP( privilege_mask );
+
+	for ( i=0; i<privset->count; i++ ) {
+		uint64_t r;
+
+		/* sanity check for invalid privilege.  we really
+		   only care about the low 32 bits */
+
+		if ( privset->set[i].luid.high != 0 )
+			return False;
+
+		if ( luid_to_se_priv( &privset->set[i].luid, &r ) )
+			se_priv_add( privilege_mask, &r );
+	}
+
+	return True;
+}