/* * mswin_ntlm_auth: helper for NTLM Authentication for Squid Cache * * (C)2002,2003 Guido Serassio - Acme Consulting S.r.l. * * Authors: *  Guido Serassio <guido.serassio@acmeconsulting.it> *  Acme Consulting S.r.l., Italy <http://www.acmeconsulting.it> * * With contributions from others mentioned in the change history section * below. * * Based on previous work of Francesco Chemolli and Robert Collins. * * Dependencies: Windows NT4 SP4 and later. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA. * * History: * * Version 1.21 * 21-02-2004 Guido Serassio *              Removed control of use of NTLM NEGOTIATE packet from *              command line, now the support is automatic. * Version 1.20 * 30-11-2003 Guido Serassio *              Added support for NTLM local calls. *              Added control of use of NTLM NEGOTIATE packet from *              command line. *              Updated documentation. * Version 1.10 * 07-09-2003 Guido Serassio *              Now is true NTLM authenticator. *              More debug info. *              Updated documentation. * Version 1.0 * 29-06-2002 Guido Serassio *              First release. * * */#include "util.h"#if HAVE_GETOPT_H#include <getopt.h>#endif#include "ntlm.h"#if HAVE_CTYPE_H#include <ctype.h>#endif#define BUFFER_SIZE 10240#ifdef NTLM_FAIL_OPENint last_ditch_enabled = 0;#endifint debug_enabled = 0;int NTLM_packet_debug_enabled = 0;static int have_challenge;char *NTAllowedGroup;char *NTDisAllowedGroup;int UseDisallowedGroup = 0;int UseAllowedGroup = 0;#if FAIL_DEBUGint fail_debug_enabled = 0;#endif/* makes a null-terminated string upper-case. Changes CONTENTS! */voiduc(char *string){    char *p = string, c;    while ((c = *p)) {	*p = xtoupper(c);	p++;    }}/* makes a null-terminated string lower-case. Changes CONTENTS! */static voidlc(char *string){    char *p = string, c;    while ((c = *p)) {	*p = xtolower(c);	p++;    }}voidhelperfail(const char *reason){#if FAIL_DEBUG    fail_debug_enabled = 1;#endif    SEND2("BH %s", reason);}/* * options: * -d enable debugging. * -v enable verbose NTLM packet debugging. * -l if specified, changes behavior on failures to last-ditch. * -A can specify a Windows Local Group name allowed to authenticate. * -D can specify a Windows Local Group name not allowed to authenticate. */char *my_program_name = NULL;voidusage(){    fprintf(stderr,#ifdef NTLM_FAIL_OPEN	"Usage: %s [-d] [-v] [-A|D LocalUserGroup] [-l] [-h]\n"#else	"Usage: %s [-d] [-v] [-A|D LocalUserGroup] [-h]\n"#endif	" -d  enable debugging.\n"	" -v  enable verbose NTLM packet debugging.\n"#ifdef NTLM_FAIL_OPEN	" -l  if specified, changes behavior on failures to last-ditch\n"#endif	" -A  specify a Windows Local Group name allowed to authenticate\n"	" -D  specify a Windows Local Group name not allowed to authenticate\n"	" -h  this message\n\n",	my_program_name);}voidprocess_options(int argc, char *argv[]){    int opt, had_error = 0;    opterr = 0;#ifdef NTLM_FAIL_OPEN    while (-1 != (opt = getopt(argc, argv, "hdvlA:D:"))) {#else    while (-1 != (opt = getopt(argc, argv, "hdvA:D:"))) {#endif	switch (opt) {	case 'A':	    safe_free(NTAllowedGroup);	    NTAllowedGroup = xstrdup(optarg);	    UseAllowedGroup = 1;	    break;	case 'D':	    safe_free(NTDisAllowedGroup);	    NTDisAllowedGroup = xstrdup(optarg);	    UseDisallowedGroup = 1;	    break;#ifdef NTLM_FAIL_OPEN	case 'l':	    last_ditch_enabled = 1;	    break;#endif	case 'd':	    debug_enabled = 1;	    break;	case 'v':	    debug_enabled = 1;	    NTLM_packet_debug_enabled = 1;	    break;	case 'h':	    usage();	    exit(0);	case '?':	    opt = optopt;	    /* fall thru to default */	default:	    fprintf(stderr, "unknown option: -%c. Exiting\n", opt);	    usage();	    had_error = 1;	}    }    if (had_error)	exit(1);}const char *obtain_challenge(ntlm_negotiate * nego, int nego_length){    const char *ch = NULL;    debug("attempting SSPI challenge retrieval\n");    ch = SSP_MakeChallenge(nego, nego_length);    if (ch) {	debug("Got it\n");	return ch;		/* All went OK, returning */    }    return NULL;}intmanage_request(){    ntlmhdr *fast_header;    char buf[BUFFER_SIZE];    char helper_command[3];    char *c, *decoded, *cred;    int plen;    int oversized = 0;    char *ErrorMessage;  try_again:    if (fgets(buf, BUFFER_SIZE, stdin) == NULL)	return 0;    c = memchr(buf, '\n', BUFFER_SIZE);		/* safer against overrun than strchr */    if (c) {	if (oversized) {	    helperfail("illegal request received");	    fprintf(stderr, "Illegal request received: '%s'\n", buf);	    return 1;	}	*c = '\0';    } else {	fprintf(stderr, "No newline in '%s'\n", buf);	oversized = 1;	goto try_again;    }    if ((strlen(buf) > 3) && NTLM_packet_debug_enabled) {	decoded = base64_decode(buf + 3);	strncpy(helper_command, buf, 2);	debug("Got '%s' from Squid with data:\n", helper_command);	hex_dump(decoded, ((strlen(buf) - 3) * 3) / 4);    } else	debug("Got '%s' from Squid\n", buf);    if (memcmp(buf, "YR", 2) == 0) {	/* refresh-request */	/* figure out what we got */	if (strlen(buf) > 3)	    decoded = base64_decode(buf + 3);	else	    decoded = base64_decode(ntlm_make_negotiate());	/* Note: we don't need to manage memory at this point, since	 *  base64_decode returns a pointer to static storage.	 */	if (!decoded) {		/* decoding failure, return error */	    SEND("NA Packet format error, couldn't base64-decode");	    return 1;	}	/* fast-track-decode request type. */	fast_header = (struct _ntlmhdr *) decoded;	/* sanity-check: it IS a NTLMSSP packet, isn't it? */	if (memcmp(fast_header->signature, "NTLMSSP", 8) != 0) {	    SEND("NA Broken authentication packet");	    return 1;	}	switch (fast_header->type) {	case NTLM_NEGOTIATE:	    /* Obtain challenge against SSPI */	    if (strlen(buf) > 3)		plen = (strlen(buf) - 3) * 3 / 4;	/* we only need it here. Optimization */	    else		plen = NEGOTIATE_LENGTH;	    if ((c = (char *) obtain_challenge((ntlm_negotiate *) decoded, plen)) != NULL) {		if (NTLM_packet_debug_enabled) {		    printf("TT %s\n", c);		    decoded = base64_decode(c);		    debug("sending 'TT' to squid with data:\n");		    hex_dump(decoded, (strlen(c) * 3) / 4);		    if (NTLM_LocalCall)			debug("NTLM Local Call detected\n");		} else {		    SEND2("TT %s", c);		}		have_challenge = 1;	    } else		helperfail("can't obtain challenge");	    return 1;	    /* notreached */	case NTLM_CHALLENGE:	    SEND		("NA Got a challenge. We refuse to have our authority disputed");	    return 1;	    /* notreached */	case NTLM_AUTHENTICATE:	    SEND("NA Got authentication request instead of negotiate request");	    return 1;	    /* notreached */	default:	    helperfail("unknown refresh-request packet type");	    return 1;	}	return 1;    }    if (memcmp(buf, "KK ", 3) == 0) {	/* authenticate-request */	if (!have_challenge) {	    helperfail("invalid challenge");	    return 1;	}	/* figure out what we got */	decoded = base64_decode(buf + 3);	/* Note: we don't need to manage memory at this point, since	 *  base64_decode returns a pointer to static storage.	 */	if (!decoded) {		/* decoding failure, return error */	    SEND("NA Packet format error, couldn't base64-decode");	    return 1;	}	/* fast-track-decode request type. */	fast_header = (struct _ntlmhdr *) decoded;	/* sanity-check: it IS a NTLMSSP packet, isn't it? */	if (memcmp(fast_header->signature, "NTLMSSP", 8) != 0) {	    SEND("NA Broken authentication packet");	    return 1;	}	switch (fast_header->type) {	case NTLM_NEGOTIATE:	    SEND("NA Invalid negotiation request received");	    return 1;	    /* notreached */	case NTLM_CHALLENGE:	    SEND		("NA Got a challenge. We refuse to have our authority disputed");	    return 1;	    /* notreached */	case NTLM_AUTHENTICATE:	    /* check against SSPI */	    plen = (strlen(buf) - 3) * 3 / 4;	/* we only need it here. Optimization */	    cred = ntlm_check_auth((ntlm_authenticate *) decoded, plen);	    have_challenge = 0;	    if (cred == NULL) {#if FAIL_DEBUG		fail_debug_enabled = 1;#endif		switch (ntlm_errno) {		case NTLM_BAD_NTGROUP:		    SEND("NA Incorrect Group Membership");		    return 1;		case NTLM_BAD_REQUEST:		    SEND("NA Incorrect Request Format");		    return 1;		case NTLM_SSPI_ERROR:		    FormatMessage(			FORMAT_MESSAGE_ALLOCATE_BUFFER |			FORMAT_MESSAGE_FROM_SYSTEM |			FORMAT_MESSAGE_IGNORE_INSERTS,			NULL,			GetLastError(),			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),	// Default language			 (LPTSTR) & ErrorMessage,			0,			NULL);		    if (ErrorMessage[strlen(ErrorMessage) - 1] == '\n')			ErrorMessage[strlen(ErrorMessage) - 1] = '\0';		    if (ErrorMessage[strlen(ErrorMessage) - 1] == '\r')			ErrorMessage[strlen(ErrorMessage) - 1] = '\0';		    SEND2("NA %s", ErrorMessage);		    LocalFree(ErrorMessage);		    return 1;		default:		    SEND("NA Unknown Error");		    return 1;		}	    }	    lc(cred);		/* let's lowercase them for our convenience */	    SEND2("AF %s", cred);	    return 1;	default:	    helperfail("unknown authentication packet type");	    return 1;	}	return 1;    } else {			/* not an auth-request */	helperfail("illegal request received");	fprintf(stderr, "Illegal request received: '%s'\n", buf);	return 1;    }    helperfail("detected protocol error");    return 1;/********* END ********/}intmain(int argc, char *argv[]){    my_program_name = argv[0];    process_options(argc, argv);    debug("%s build " __DATE__ ", " __TIME__ " starting up...\n", my_program_name);    if (LoadSecurityDll(SSP_NTLM, NTLM_PACKAGE_NAME) == NULL) {	fprintf(stderr, "FATAL, can't initialize SSPI, exiting.\n");	exit(1);    }    debug("SSPI initialized OK\n");    atexit(UnloadSecurityDll);    /* initialize FDescs */    setbuf(stdout, NULL);    setbuf(stderr, NULL);    while (manage_request()) {	/* everything is done within manage_request */    }    exit(0);}