auth_util.c

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/*
   Unix SMB/CIFS implementation.
   Authentication utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Andrew Bartlett 2001
   Copyright (C) Jeremy Allison 2000-2001
   Copyright (C) Rafal Szczesniak 2002

   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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH


/****************************************************************************
 Create a UNIX user on demand.
****************************************************************************/

static int smb_create_user(const char *domain, const char *unix_username, const char *homedir)
{
	pstring add_script;
	int ret;

	pstrcpy(add_script, lp_adduser_script());
	if (! *add_script)
		return -1;
	all_string_sub(add_script, "%u", unix_username, sizeof(pstring));
	if (domain)
		all_string_sub(add_script, "%D", domain, sizeof(pstring));
	if (homedir)
		all_string_sub(add_script, "%H", homedir, sizeof(pstring));
	ret = smbrun(add_script,NULL);
	flush_pwnam_cache();
	DEBUG(ret ? 0 : 3,("smb_create_user: Running the command `%s' gave %d\n",add_script,ret));
	return ret;
}

/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

static NTSTATUS make_user_info(auth_usersupplied_info **user_info, 
                               const char *smb_name, 
                               const char *internal_username,
                               const char *client_domain, 
                               const char *domain,
                               const char *wksta_name, 
                               DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd,
                               DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd,
                               DATA_BLOB *plaintext, 
                               BOOL encrypted)
{

	DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name));

	*user_info = SMB_MALLOC_P(auth_usersupplied_info);
	if (!user_info) {
		DEBUG(0,("malloc failed for user_info (size %lu)\n", (unsigned long)sizeof(*user_info)));
		return NT_STATUS_NO_MEMORY;
	}

	ZERO_STRUCTP(*user_info);

	DEBUG(5,("making strings for %s's user_info struct\n", internal_username));

	(*user_info)->smb_name.str = SMB_STRDUP(smb_name);
	if ((*user_info)->smb_name.str) { 
		(*user_info)->smb_name.len = strlen(smb_name);
	} else {
		free_user_info(user_info);
		return NT_STATUS_NO_MEMORY;
	}
	
	(*user_info)->internal_username.str = SMB_STRDUP(internal_username);
	if ((*user_info)->internal_username.str) { 
		(*user_info)->internal_username.len = strlen(internal_username);
	} else {
		free_user_info(user_info);
		return NT_STATUS_NO_MEMORY;
	}

	(*user_info)->domain.str = SMB_STRDUP(domain);
	if ((*user_info)->domain.str) { 
		(*user_info)->domain.len = strlen(domain);
	} else {
		free_user_info(user_info);
		return NT_STATUS_NO_MEMORY;
	}

	(*user_info)->client_domain.str = SMB_STRDUP(client_domain);
	if ((*user_info)->client_domain.str) { 
		(*user_info)->client_domain.len = strlen(client_domain);
	} else {
		free_user_info(user_info);
		return NT_STATUS_NO_MEMORY;
	}

	(*user_info)->wksta_name.str = SMB_STRDUP(wksta_name);
	if ((*user_info)->wksta_name.str) { 
		(*user_info)->wksta_name.len = strlen(wksta_name);
	} else {
		free_user_info(user_info);
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(5,("making blobs for %s's user_info struct\n", internal_username));

	if (lm_pwd)
		(*user_info)->lm_resp = data_blob(lm_pwd->data, lm_pwd->length);
	if (nt_pwd)
		(*user_info)->nt_resp = data_blob(nt_pwd->data, nt_pwd->length);
	if (lm_interactive_pwd)
		(*user_info)->lm_interactive_pwd = data_blob(lm_interactive_pwd->data, lm_interactive_pwd->length);
	if (nt_interactive_pwd)
		(*user_info)->nt_interactive_pwd = data_blob(nt_interactive_pwd->data, nt_interactive_pwd->length);

	if (plaintext)
		(*user_info)->plaintext_password = data_blob(plaintext->data, plaintext->length);

	(*user_info)->encrypted = encrypted;

	(*user_info)->logon_parameters = 0;

	DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name));

	return NT_STATUS_OK;
}

/****************************************************************************
 Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/

NTSTATUS make_user_info_map(auth_usersupplied_info **user_info, 
			    const char *smb_name, 
			    const char *client_domain, 
			    const char *wksta_name, 
 			    DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd,
 			    DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd,
			    DATA_BLOB *plaintext, 
			    BOOL encrypted)
{
	const char *domain;
	fstring internal_username;
	fstrcpy(internal_username, smb_name);
	map_username(internal_username); 
	
	DEBUG(5, ("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n",
	      client_domain, smb_name, wksta_name));
	
	/* don't allow "" as a domain, fixes a Win9X bug 
	   where it doens't supply a domain for logon script
	   'net use' commands.                                 */

	if ( *client_domain )
		domain = client_domain;
	else
		domain = lp_workgroup();

	/* do what win2k does.  Always map unknown domains to our own
	   and let the "passdb backend" handle unknown users. */

	if ( !is_trusted_domain(domain) && !strequal(domain, get_global_sam_name()) ) 
		domain = get_default_sam_name();
	
	/* we know that it is a trusted domain (and we are allowing them) or it is our domain */
	
	return make_user_info(user_info, smb_name, internal_username, 
			      client_domain, domain, wksta_name, 
			      lm_pwd, nt_pwd,
			      lm_interactive_pwd, nt_interactive_pwd,
			      plaintext, encrypted);
}

/****************************************************************************
 Create an auth_usersupplied_data, making the DATA_BLOBs here. 
 Decrypt and encrypt the passwords.
****************************************************************************/

BOOL make_user_info_netlogon_network(auth_usersupplied_info **user_info, 
				     const char *smb_name, 
				     const char *client_domain, 
				     const char *wksta_name, 
				     uint32 logon_parameters,
				     const uchar *lm_network_pwd, int lm_pwd_len,
				     const uchar *nt_network_pwd, int nt_pwd_len)
{
	BOOL ret;
	NTSTATUS nt_status;
	DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
	DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);

	nt_status = make_user_info_map(user_info,
				       smb_name, client_domain, 
				       wksta_name, 
				       lm_pwd_len ? &lm_blob : NULL, 
				       nt_pwd_len ? &nt_blob : NULL,
				       NULL, NULL, NULL,
				       True);

	if (NT_STATUS_IS_OK(nt_status)) {
		(*user_info)->logon_parameters = logon_parameters;
	}
	ret = NT_STATUS_IS_OK(nt_status) ? True : False;

	data_blob_free(&lm_blob);
	data_blob_free(&nt_blob);
	return ret;
}

/****************************************************************************
 Create an auth_usersupplied_data, making the DATA_BLOBs here. 
 Decrypt and encrypt the passwords.
****************************************************************************/

BOOL make_user_info_netlogon_interactive(auth_usersupplied_info **user_info, 
					 const char *smb_name, 
					 const char *client_domain, 
					 const char *wksta_name, 
					 uint32 logon_parameters,
					 const uchar chal[8], 
					 const uchar lm_interactive_pwd[16], 
					 const uchar nt_interactive_pwd[16], 
					 const uchar *dc_sess_key)
{
	char lm_pwd[16];
	char nt_pwd[16];
	unsigned char local_lm_response[24];
	unsigned char local_nt_response[24];
	unsigned char key[16];
	
	ZERO_STRUCT(key);
	memcpy(key, dc_sess_key, 8);
	
	if (lm_interactive_pwd) memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd));
	if (nt_interactive_pwd) memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd));
	
#ifdef DEBUG_PASSWORD
	DEBUG(100,("key:"));
	dump_data(100, (char *)key, sizeof(key));
	
	DEBUG(100,("lm owf password:"));
	dump_data(100, lm_pwd, sizeof(lm_pwd));
	
	DEBUG(100,("nt owf password:"));
	dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
	
	if (lm_interactive_pwd)
		SamOEMhash((uchar *)lm_pwd, key, sizeof(lm_pwd));
	
	if (nt_interactive_pwd)
		SamOEMhash((uchar *)nt_pwd, key, sizeof(nt_pwd));
	
#ifdef DEBUG_PASSWORD
	DEBUG(100,("decrypt of lm owf password:"));
	dump_data(100, lm_pwd, sizeof(lm_pwd));
	
	DEBUG(100,("decrypt of nt owf password:"));
	dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
	
	if (lm_interactive_pwd)
		SMBOWFencrypt((const unsigned char *)lm_pwd, chal, local_lm_response);

	if (nt_interactive_pwd)
		SMBOWFencrypt((const unsigned char *)nt_pwd, chal, local_nt_response);
	
	/* Password info paranoia */
	ZERO_STRUCT(key);

	{
		BOOL ret;
		NTSTATUS nt_status;
		DATA_BLOB local_lm_blob;
		DATA_BLOB local_nt_blob;

		DATA_BLOB lm_interactive_blob;
		DATA_BLOB nt_interactive_blob;
		
		if (lm_interactive_pwd) {
			local_lm_blob = data_blob(local_lm_response, sizeof(local_lm_response));
			lm_interactive_blob = data_blob(lm_pwd, sizeof(lm_pwd));
			ZERO_STRUCT(lm_pwd);
		}
		
		if (nt_interactive_pwd) {
			local_nt_blob = data_blob(local_nt_response, sizeof(local_nt_response));
			nt_interactive_blob = data_blob(nt_pwd, sizeof(nt_pwd));
			ZERO_STRUCT(nt_pwd);
		}

		nt_status = make_user_info_map(user_info, 
		                               smb_name, client_domain, 
		                               wksta_name, 
		                               lm_interactive_pwd ? &local_lm_blob : NULL,
		                               nt_interactive_pwd ? &local_nt_blob : NULL,
		                               lm_interactive_pwd ? &lm_interactive_blob : NULL,
		                               nt_interactive_pwd ? &nt_interactive_blob : NULL,
		                               NULL,
		                               True);

		if (NT_STATUS_IS_OK(nt_status)) {
			(*user_info)->logon_parameters = logon_parameters;
		}

		ret = NT_STATUS_IS_OK(nt_status) ? True : False;
		data_blob_free(&local_lm_blob);
		data_blob_free(&local_nt_blob);
		data_blob_free(&lm_interactive_blob);
		data_blob_free(&nt_interactive_blob);
		return ret;
	}
}


/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

BOOL make_user_info_for_reply(auth_usersupplied_info **user_info, 
			      const char *smb_name, 
			      const char *client_domain,
			      const uint8 chal[8],
			      DATA_BLOB plaintext_password)
{

	DATA_BLOB local_lm_blob;
	DATA_BLOB local_nt_blob;
	NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
			
	/*
	 * Not encrypted - do so.
	 */
	
	DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted format.\n"));
	
	if (plaintext_password.data) {
		unsigned char local_lm_response[24];
		
#ifdef DEBUG_PASSWORD
		DEBUG(10,("Unencrypted password (len %d):\n",(int)plaintext_password.length));
		dump_data(100, (const char *)plaintext_password.data, plaintext_password.length);
#endif

		SMBencrypt( (const char *)plaintext_password.data, (const uchar*)chal, local_lm_response);
		local_lm_blob = data_blob(local_lm_response, 24);
		
		/* We can't do an NT hash here, as the password needs to be
		   case insensitive */
		local_nt_blob = data_blob(NULL, 0); 
		
	} else {
		local_lm_blob = data_blob(NULL, 0); 
		local_nt_blob = data_blob(NULL, 0); 
	}
	
	ret = make_user_info_map(user_info, smb_name,
	                         client_domain, 
	                         get_remote_machine_name(),
	                         local_lm_blob.data ? &local_lm_blob : NULL,
	                         local_nt_blob.data ? &local_nt_blob : NULL,
				 NULL, NULL,
	                         plaintext_password.data ? &plaintext_password : NULL, 
	                         False);
	
	data_blob_free(&local_lm_blob);
	return NT_STATUS_IS_OK(ret) ? True : False;
}

/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

NTSTATUS make_user_info_for_reply_enc(auth_usersupplied_info **user_info, 
                                      const char *smb_name,
                                      const char *client_domain, 
                                      DATA_BLOB lm_resp, DATA_BLOB nt_resp)
{
	return make_user_info_map(user_info, smb_name, 
				  client_domain, 
				  get_remote_machine_name(), 
				  lm_resp.data ? &lm_resp : NULL, 
				  nt_resp.data ? &nt_resp : NULL, 
				  NULL, NULL, NULL,
				  True);
}

/****************************************************************************
 Create a guest user_info blob, for anonymous authenticaion.
****************************************************************************/

BOOL make_user_info_guest(auth_usersupplied_info **user_info) 
{
	NTSTATUS nt_status;

	nt_status = make_user_info(user_info, 
				   "","", 
				   "","", 
				   "", 
				   NULL, NULL, 
				   NULL, NULL, 
				   NULL,
				   True);
			      
	return NT_STATUS_IS_OK(nt_status) ? True : False;
}

/****************************************************************************
 prints a NT_USER_TOKEN to debug output.
****************************************************************************/

void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)