/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Luke Kenneth Caseson Leighton 1998-1999
   Copyright (C) Jeremy Allison  1999
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/* NOTE! the global_sam_sid is the SID of our local SAM. This is only
   equal to the domain SID when we are a DC, otherwise its our
   workstation SID */
DOM_SID global_sam_sid;
extern pstring global_myname;
extern fstring global_myworkgroup;

/*
 * Some useful sids
 */

DOM_SID global_sid_World_Domain;	    	/* Everyone domain */
DOM_SID global_sid_World;    				/* Everyone */
DOM_SID global_sid_Creator_Owner_Domain;    /* Creator Owner domain */
DOM_SID global_sid_Creator_Owner;    		/* Creator Owner */
DOM_SID global_sid_Creator_Group;              /* Creator Group */
DOM_SID global_sid_NT_Authority;    		/* NT Authority */
DOM_SID global_sid_NULL;            		/* NULL sid */
DOM_SID global_sid_Authenticated_Users;		/* All authenticated rids */
DOM_SID global_sid_Network;					/* Network rids */
DOM_SID global_sid_Anonymous;				/* Anonymous login */

DOM_SID global_sid_Builtin; 				/* Local well-known domain */
DOM_SID global_sid_Builtin_Administrators;
DOM_SID global_sid_Builtin_Users;
DOM_SID global_sid_Builtin_Guests;			/* Builtin guest users */

const DOM_SID *global_sid_everyone = &global_sid_World;

typedef struct _known_sid_users {
	uint32 rid;
	enum SID_NAME_USE sid_name_use;
	char *known_user_name;
} known_sid_users;

/* static known_sid_users no_users[] = {{0, 0, NULL}}; */

static known_sid_users everyone_users[] = {
	{ 0, SID_NAME_WKN_GRP, "Everyone" },
	{0, (enum SID_NAME_USE)0, NULL}};

static known_sid_users creator_owner_users[] = {
	{ 0, SID_NAME_ALIAS, "Creator Owner" },
	{0, (enum SID_NAME_USE)0, NULL}};

static known_sid_users nt_authority_users[] = {
	{  1, SID_NAME_ALIAS, "Dialup" },
	{  2, SID_NAME_ALIAS, "Network"},
	{  3, SID_NAME_ALIAS, "Batch"},
	{  4, SID_NAME_ALIAS, "Interactive"},
	{  6, SID_NAME_ALIAS, "Service"},
	{  7, SID_NAME_ALIAS, "AnonymousLogon"},
	{  8, SID_NAME_ALIAS, "Proxy"},
	{  9, SID_NAME_ALIAS, "ServerLogon"},
	{ 11, SID_NAME_ALIAS, "Authenticated Users"},
	{ 18, SID_NAME_ALIAS, "SYSTEM"},
	{  0, (enum SID_NAME_USE)0, NULL}};

static known_sid_users builtin_groups[] = {
	{ BUILTIN_ALIAS_RID_ADMINS, SID_NAME_ALIAS, "Administrators" },
	{ BUILTIN_ALIAS_RID_USERS, SID_NAME_ALIAS, "Users" },
	{ BUILTIN_ALIAS_RID_GUESTS, SID_NAME_ALIAS, "Guests" },
	{ BUILTIN_ALIAS_RID_ACCOUNT_OPS, SID_NAME_ALIAS, "Account Operators" },
	{ BUILTIN_ALIAS_RID_SYSTEM_OPS, SID_NAME_ALIAS, "Server Operators" },
	{ BUILTIN_ALIAS_RID_PRINT_OPS, SID_NAME_ALIAS, "Print Operators" },
	{ BUILTIN_ALIAS_RID_BACKUP_OPS, SID_NAME_ALIAS, "Backup Operators" },
	{  0, (enum SID_NAME_USE)0, NULL}};

#define MAX_SID_NAMES	7

static struct sid_name_map_info
{
	DOM_SID *sid;
	char *name;
	known_sid_users *known_users;
} sid_name_map[MAX_SID_NAMES];

static BOOL sid_name_map_initialized = False;

/*
 * An NT compatible anonymous token.
 */

static DOM_SID anon_sid_array[3];

NT_USER_TOKEN anonymous_token = {
    3,
    anon_sid_array
};

/**************************************************************************
 quick init function
 *************************************************************************/
static void init_sid_name_map (void)
{
	int i = 0;
	
	if (sid_name_map_initialized) return;
	

	if ((lp_security() == SEC_USER) && lp_domain_logons()) {
		sid_name_map[i].sid = &global_sam_sid;
		sid_name_map[i].name = global_myworkgroup;
		sid_name_map[i].known_users = NULL;
		i++;
		sid_name_map[i].sid = &global_sam_sid;
		sid_name_map[i].name = global_myname;
		sid_name_map[i].known_users = NULL;
		i++;
	}
	else {
		sid_name_map[i].sid = &global_sam_sid;
		sid_name_map[i].name = global_myname;
		sid_name_map[i].known_users = NULL;
		i++;
	}

	sid_name_map[i].sid = &global_sid_Builtin;
	sid_name_map[i].name = "BUILTIN";
	sid_name_map[i].known_users = &builtin_groups[0];
	i++;
	
	sid_name_map[i].sid = &global_sid_World_Domain;
	sid_name_map[i].name = "";
	sid_name_map[i].known_users = &everyone_users[0];
	i++;

	sid_name_map[i].sid = &global_sid_Creator_Owner_Domain;
	sid_name_map[i].name = "";
	sid_name_map[i].known_users = &creator_owner_users[0];
	i++;
		
	sid_name_map[i].sid = &global_sid_NT_Authority;
	sid_name_map[i].name = "NT Authority";
	sid_name_map[i].known_users = &nt_authority_users[0];
	i++;
		

	/* end of array */
	sid_name_map[i].sid = NULL;
	sid_name_map[i].name = NULL;
	sid_name_map[i].known_users = NULL;
	
	sid_name_map_initialized = True;
		
	return;

}

/****************************************************************************
 Creates some useful well known sids
****************************************************************************/

void generate_wellknown_sids(void)
{
	string_to_sid(&global_sid_Builtin, "S-1-5-32");
	string_to_sid(&global_sid_Builtin_Administrators, "S-1-5-32-544");
	string_to_sid(&global_sid_Builtin_Users, "S-1-5-32-545");
	string_to_sid(&global_sid_Builtin_Guests, "S-1-5-32-546");
	string_to_sid(&global_sid_World_Domain, "S-1-1");
	string_to_sid(&global_sid_World, "S-1-1-0");
	string_to_sid(&global_sid_Creator_Owner_Domain, "S-1-3");
	string_to_sid(&global_sid_Creator_Owner, "S-1-3-0");
	string_to_sid(&global_sid_Creator_Group, "S-1-3-1");
	string_to_sid(&global_sid_NT_Authority, "S-1-5");
	string_to_sid(&global_sid_NULL, "S-1-0-0");
	string_to_sid(&global_sid_Authenticated_Users, "S-1-5-11");
	string_to_sid(&global_sid_Network, "S-1-5-2");
	string_to_sid(&global_sid_Anonymous, "S-1-5-7");

	/* Create the anon token. */
	sid_copy( &anonymous_token.user_sids[0], &global_sid_World);
	sid_copy( &anonymous_token.user_sids[1], &global_sid_Network);
	sid_copy( &anonymous_token.user_sids[2], &global_sid_Anonymous);
}

/**************************************************************************
 Turns a domain SID into a name, returned in the nt_domain argument.
***************************************************************************/

BOOL map_domain_sid_to_name(DOM_SID *sid, char *nt_domain)
{
	fstring sid_str;
	int i = 0;
	
	sid_to_string(sid_str, sid);

	if (!sid_name_map_initialized) 
		init_sid_name_map();

	DEBUG(5,("map_domain_sid_to_name: %s\n", sid_str));

	if (nt_domain == NULL)
		return False;

	while (sid_name_map[i].sid != NULL) {
		sid_to_string(sid_str, sid_name_map[i].sid);
		DEBUG(5,("map_domain_sid_to_name: compare: %s\n", sid_str));
		if (sid_equal(sid_name_map[i].sid, sid)) {		
			fstrcpy(nt_domain, sid_name_map[i].name);
			DEBUG(5,("map_domain_sid_to_name: found '%s'\n", nt_domain));
			return True;
		}
		i++;
	}

	DEBUG(5,("map_domain_sid_to_name: mapping for %s not found\n", sid_str));

    return False;
}

/**************************************************************************
 Looks up a known username from one of the known domains.
***************************************************************************/

BOOL lookup_known_rid(DOM_SID *sid, uint32 rid, char *name, enum SID_NAME_USE *psid_name_use)
{
	int i = 0;
	struct sid_name_map_info *psnm;

	if (!sid_name_map_initialized) 
		init_sid_name_map();

	for(i = 0; sid_name_map[i].sid != NULL; i++) {
		psnm = &sid_name_map[i];
		if(sid_equal(psnm->sid, sid)) {
			int j;
			for(j = 0; psnm->known_users && psnm->known_users[j].known_user_name != NULL; j++) {
				if(rid == psnm->known_users[j].rid) {
					DEBUG(5,("lookup_builtin_rid: rid = %u, domain = '%s', user = '%s'\n",
						(unsigned int)rid, psnm->name, psnm->known_users[j].known_user_name ));
					fstrcpy( name, psnm->known_users[j].known_user_name);
					*psid_name_use = psnm->known_users[j].sid_name_use;
					return True;
				}
			}
		}
	}

	return False;
}

/**************************************************************************
 Turns a domain name into a SID.
 *** side-effect: if the domain name is NULL, it is set to our domain ***
***************************************************************************/

BOOL map_domain_name_to_sid(DOM_SID *sid, char *nt_domain)
{
	int i = 0;

	if (nt_domain == NULL) {
		DEBUG(5,("map_domain_name_to_sid: mapping NULL domain to our SID.\n"));
		sid_copy(sid, &global_sam_sid);
		return True;
	}

	if (nt_domain[0] == 0) {
		fstrcpy(nt_domain, global_myname);
		DEBUG(5,("map_domain_name_to_sid: overriding blank name to %s\n", nt_domain));
		sid_copy(sid, &global_sam_sid);
		return True;
	}

	DEBUG(5,("map_domain_name_to_sid: %s\n", nt_domain));

	if (!sid_name_map_initialized) 
		init_sid_name_map();

	while (sid_name_map[i].name != NULL) {
		DEBUG(5,("map_domain_name_to_sid: compare: %s\n", sid_name_map[i].name));
		if (strequal(sid_name_map[i].name, nt_domain)) {
			fstring sid_str;
			sid_copy(sid, sid_name_map[i].sid);
			sid_to_string(sid_str, sid_name_map[i].sid);
			DEBUG(5,("map_domain_name_to_sid: found %s\n", sid_str));
			return True;
		}
		i++;
	}

	DEBUG(0,("map_domain_name_to_sid: mapping to %s not found.\n", nt_domain));
	return False;
}

/**************************************************************************
 Splits a name of format \DOMAIN\name or name into its two components.
 Sets the DOMAIN name to global_myname if it has not been specified.
***************************************************************************/

void split_domain_name(const char *fullname, char *domain, char *name)
{
	pstring full_name;
	char *p, *sep;

	sep = lp_winbind_separator();

	*domain = *name = '\0';

	if (fullname[0] == sep[0] || fullname[0] == '\\')
		fullname++;

	pstrcpy(full_name, fullname);
	p = strchr(full_name+1, '\\');
	if (!p) p = strchr(full_name+1, sep[0]);

	if (p != NULL) {
		*p = 0;
		fstrcpy(domain, full_name);
		fstrcpy(name, p+1);
	} else {
		fstrcpy(domain, global_myname);
		fstrcpy(name, full_name);
	}

	DEBUG(10,("split_domain_name:name '%s' split into domain :'%s' and user :'%s'\n",
			fullname, domain, name));
}

/*****************************************************************
 Convert a SID to an ascii string.
*****************************************************************/

char *sid_to_string(fstring sidstr_out, DOM_SID *sid)
{
  char subauth[16];
  int i;
  /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
  uint32 ia = (sid->id_auth[5]) +
              (sid->id_auth[4] << 8 ) +
              (sid->id_auth[3] << 16) +
              (sid->id_auth[2] << 24);

  slprintf(sidstr_out, sizeof(fstring) - 1, "S-%u-%lu", (unsigned int)sid->sid_rev_num, (unsigned long)ia);

  for (i = 0; i < sid->num_auths; i++) {
    slprintf(subauth, sizeof(subauth)-1, "-%lu", (unsigned long)sid->sub_auths[i]);
    fstrcat(sidstr_out, subauth);
  }

  return sidstr_out;
}

/*
  useful function for debug lines
*/
const char *sid_string_static(DOM_SID *sid)
{
	static fstring sid_str;
	sid_to_string(sid_str, sid);
	return sid_str;
}

/*****************************************************************
 Convert a string to a SID. Returns True on success, False on fail.
*****************************************************************/  
   
BOOL string_to_sid(DOM_SID *sidout, const char *sidstr)
{
  pstring tok;
  char *p, *q;
  /* BIG NOTE: this function only does SIDS where the identauth is not >= 2^32 */
  uint32 ia;
  
  if (StrnCaseCmp( sidstr, "S-", 2)) {
    DEBUG(0,("string_to_sid: Sid %s does not start with 'S-'.\n", sidstr));
    return False;
  }

  memset((char *)sidout, '\0', sizeof(DOM_SID));

  q = p = strdup(sidstr + 2);
  if (p == NULL) {
    DEBUG(0, ("string_to_sid: out of memory!\n"));
    return False;
  }

  if (!next_token(&p, tok, "-", sizeof(tok))) {
    DEBUG(0,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
    SAFE_FREE(q);
    return False;
  }

  /* Get the revision number. */
  sidout->sid_rev_num = (uint8)strtoul(tok, NULL, 10);

  if (!next_token(&p, tok, "-", sizeof(tok))) {
    DEBUG(0,("string_to_sid: Sid %s is not in a valid format.\n", sidstr));
    SAFE_FREE(q);
    return False;
  }

  /* identauth in decimal should be <  2^32 */
  ia = (uint32)strtoul(tok, NULL, 10);

  /* NOTE - the ia value is in big-endian format. */
  sidout->id_auth[0] = 0;
  sidout->id_auth[1] = 0;
  sidout->id_auth[2] = (ia & 0xff000000) >> 24;
  sidout->id_auth[3] = (ia & 0x00ff0000) >> 16;
  sidout->id_auth[4] = (ia & 0x0000ff00) >> 8;
  sidout->id_auth[5] = (ia & 0x000000ff);

  sidout->num_auths = 0;

  while(next_token(&p, tok, "-", sizeof(tok)) && 
	sidout->num_auths < MAXSUBAUTHS) {
    /* 
     * NOTE - the subauths are in native machine-endian format. They
     * are converted to little-endian when linearized onto the wire.
     */
	sid_append_rid(sidout, (uint32)strtoul(tok, NULL, 10));
  }

  SAFE_FREE(q);
  return True;
}

/*****************************************************************
 Add a rid to the end of a sid
*****************************************************************/  

BOOL sid_append_rid(DOM_SID *sid, uint32 rid)
{
	if (sid->num_auths < MAXSUBAUTHS) {
		sid->sub_auths[sid->num_auths++] = rid;
		return True;
	}
	return False;
}

/*****************************************************************
 Removes the last rid from the end of a sid
*****************************************************************/  

BOOL sid_split_rid(DOM_SID *sid, uint32 *rid)
{
	if (sid->num_auths > 0) {
		sid->num_auths--;
		*rid = sid->sub_auths[sid->num_auths];
		return True;
	}
	return False;
}

/*****************************************************************
 Return the last rid from the end of a sid
*****************************************************************/  

BOOL sid_peek_rid(DOM_SID *sid, uint32 *rid)
{
	if (sid->num_auths > 0) {
		*rid = sid->sub_auths[sid->num_auths - 1];
		return True;
	}
	return False;
}

/*****************************************************************
 Copies a sid
*****************************************************************/  

void sid_copy(DOM_SID *dst, const DOM_SID *src)
{
	int i;

	memset((char *)dst, '\0', sizeof(DOM_SID));

	dst->sid_rev_num = src->sid_rev_num;
	dst->num_auths = src->num_auths;

	memcpy(&dst->id_auth[0], &src->id_auth[0], sizeof(src->id_auth));

	for (i = 0; i < src->num_auths; i++)
		dst->sub_auths[i] = src->sub_auths[i];
}

/*****************************************************************
 Duplicates a sid - mallocs the target.
*****************************************************************/

DOM_SID *sid_dup(DOM_SID *src)
{
  DOM_SID *dst;

  if(!src)
    return NULL;

  if((dst = malloc(sizeof(DOM_SID))) != NULL) {
	memset(dst, '\0', sizeof(DOM_SID));
	sid_copy( dst, src);
  }

  return dst;
}

/*****************************************************************
 Write a sid out into on-the-wire format.
*****************************************************************/  
BOOL sid_linearize(char *outbuf, size_t len, DOM_SID *sid)
{
	size_t i;

	if (len < sid_size(sid))
		return False;

	SCVAL(outbuf,0,sid->sid_rev_num);
	SCVAL(outbuf,1,sid->num_auths);
	memcpy(&outbuf[2], sid->id_auth, 6);
	for(i = 0; i < sid->num_auths; i++)
		SIVAL(outbuf, 8 + (i*4), sid->sub_auths[i]);

	return True;
}

/*****************************************************************
 parse a on-the-wire SID to a DOM_SID
*****************************************************************/  
BOOL sid_parse(char *inbuf, size_t len, DOM_SID *sid)
{
	int i;
	if (len < 8) return False;
	sid->sid_rev_num = CVAL(inbuf, 0);
	sid->num_auths = CVAL(inbuf, 1);
	memcpy(sid->id_auth, inbuf+2, 6);
	if (len < 8 + sid->num_auths*4) return False;
	for (i=0;i<sid->num_auths;i++) {
		sid->sub_auths[i] = IVAL(inbuf, 8+i*4);
	}
	return True;
}


/*****************************************************************
 Compare the auth portion of two sids.
*****************************************************************/  
int sid_compare_auth(const DOM_SID *sid1, const DOM_SID *sid2)
{
	int i;

	if (sid1 == sid2) return 0;
	if (!sid1) return -1;
	if (!sid2) return 1;

	if (sid1->sid_rev_num != sid2->sid_rev_num)
		return sid1->sid_rev_num - sid2->sid_rev_num;

	for (i = 0; i < 6; i++)
		if (sid1->id_auth[i] != sid2->id_auth[i])
			return sid1->id_auth[i] - sid2->id_auth[i];

	return 0;
}

/*****************************************************************
 Compare two sids.
*****************************************************************/  
int sid_compare(const DOM_SID *sid1, const DOM_SID *sid2)
{
	int i;

	if (sid1 == sid2) return 0;
	if (!sid1) return -1;
	if (!sid2) return 1;

	/* compare most likely different rids, first: i.e start at end */
	if (sid1->num_auths != sid2->num_auths)
		return sid1->num_auths - sid2->num_auths;

	for (i = sid1->num_auths-1; i >= 0; --i)
		if (sid1->sub_auths[i] != sid2->sub_auths[i])
			return sid1->sub_auths[i] - sid2->sub_auths[i];

	return sid_compare_auth(sid1, sid2);
}

/*****************************************************************
see if 2 SIDs are in the same domain
this just compares the leading sub-auths
*****************************************************************/  
int sid_compare_domain(const DOM_SID *sid1, const DOM_SID *sid2)
{
	int n, i;

	n = MIN(sid1->num_auths, sid2->num_auths);

	for (i = n-1; i >= 0; --i)
		if (sid1->sub_auths[i] != sid2->sub_auths[i])
			return sid1->sub_auths[i] - sid2->sub_auths[i];

	return sid_compare_auth(sid1, sid2);
}

/*****************************************************************
 Compare two sids.
*****************************************************************/  
BOOL sid_equal(const DOM_SID *sid1, const DOM_SID *sid2)
{
	return sid_compare(sid1, sid2) == 0;
}


/*****************************************************************
 Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/  
BOOL sid_check_is_domain(const DOM_SID *sid)
{
	return sid_equal(sid, &global_sam_sid);
}


/*****************************************************************
 Check if the SID is the builtin SID (S-1-5-32).
*****************************************************************/  
BOOL sid_check_is_builtin(const DOM_SID *sid)
{
	return sid_equal(sid, &global_sid_Builtin);
}


/*****************************************************************
 Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/  
BOOL sid_check_is_in_our_domain(const DOM_SID *sid)
{
	DOM_SID dom_sid;
	uint32 rid;

	sid_copy(&dom_sid, sid);
	sid_split_rid(&dom_sid, &rid);
	
	return sid_equal(&dom_sid, &global_sam_sid);
}

/*****************************************************************
 Check if the SID is our domain SID (S-1-5-21-x-y-z).
*****************************************************************/  
BOOL sid_check_is_in_builtin(const DOM_SID *sid)
{
	DOM_SID dom_sid;
	uint32 rid;

	sid_copy(&dom_sid, sid);
	sid_split_rid(&dom_sid, &rid);
	
	return sid_equal(&dom_sid, &global_sid_Builtin);
}


/*****************************************************************
 Calculates size of a sid.
*****************************************************************/  

size_t sid_size(DOM_SID *sid)
{
	if (sid == NULL)
		return 0;

	return sid->num_auths * sizeof(uint32) + 8;
}

/*****************************************************************
 Returns true if SID is internal (and non-mappable).
*****************************************************************/

BOOL non_mappable_sid(DOM_SID *sid)
{
	DOM_SID dom;
	uint32 rid;

	sid_copy(&dom, sid);
	sid_split_rid(&dom, &rid);

	if (sid_equal(&dom, &global_sid_Builtin))
		return True;

	if (sid_equal(&dom, &global_sid_Creator_Owner_Domain))
		return True;
 
	if (sid_equal(&dom, &global_sid_NT_Authority))
		return True;

	return False;
}

/*
  return the binary string representation of a DOM_SID
  caller must free
*/
char *sid_binstring(DOM_SID *sid)
{
	char *buf, *s;
	int len = sid_size(sid);
	buf = malloc(len);
	if (!buf) return NULL;
	sid_linearize(buf, len, sid);
	s = binary_string(buf, len);
	free(buf);
	return s;
}