/* * mswin_negotiate_auth: helper for Negotiate Authentication for Squid Cache * * (C)2005 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 1.0 * 29-10-2005 Guido Serassio *              First release. * * */#include "util.h"#if HAVE_GETOPT_H#include <getopt.h>#endif#include "negotiate.h"#if HAVE_CTYPE_H#include <ctype.h>#endif#define BUFFER_SIZE 10240int debug_enabled = 0;int Negotiate_packet_debug_enabled = 0;static int have_serverblob;/* 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. */char *my_program_name = NULL;voidusage(){    fprintf(stderr,	"Usage: %s [-d] [-v] [-h]\n"	" -d  enable debugging.\n"	" -v  enable verbose NTLM packet debugging.\n"	" -h  this message\n\n",	my_program_name);}voidprocess_options(int argc, char *argv[]){    int opt, had_error = 0;    opterr = 0;    while (-1 != (opt = getopt(argc, argv, "hdv"))) {	switch (opt) {	case 'd':	    debug_enabled = 1;	    break;	case 'v':	    debug_enabled = 1;	    Negotiate_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);}intmanage_request(){    char buf[BUFFER_SIZE];    char helper_command[3];    char *c, *decoded;    int plen, status;    int oversized = 0;    char *ErrorMessage;    static char cred[SSP_MAX_CRED_LEN + 1];    BOOL Done = FALSE;  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) && Negotiate_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 ", 3) == 0) {	/* refresh-request */	/* 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;	}	/* Obtain server blob against SSPI */	plen = (strlen(buf) - 3) * 3 / 4;	/* we only need it here. Optimization */	c = (char *) SSP_MakeNegotiateBlob(decoded, plen, &Done, &status, cred);	if (status == SSP_OK) {	    if (Done) {		lc(cred);	/* let's lowercase them for our convenience */		have_serverblob = 0;		Done = FALSE;		if (Negotiate_packet_debug_enabled) {		    printf("AF %s %s\n", c, cred);		    decoded = base64_decode(c);		    debug("sending 'AF' %s to squid with data:\n", cred);		    hex_dump(decoded, (strlen(c) * 3) / 4);		} else		    SEND3("AF %s %s", c, cred);	    } else {		if (Negotiate_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);		} else {		    SEND2("TT %s", c);		}		have_serverblob = 1;	    }	} else	    helperfail("can't obtain server blob");	return 1;    }    if (memcmp(buf, "KK ", 3) == 0) {	/* authenticate-request */	if (!have_serverblob) {	    helperfail("invalid server blob");	    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;	}	/* check against SSPI */	plen = (strlen(buf) - 3) * 3 / 4;	/* we only need it here. Optimization */	c = (char *) SSP_ValidateNegotiateCredentials(decoded, plen, &Done, &status, cred);	if (status == SSP_ERROR) {#if FAIL_DEBUG	    fail_debug_enabled = 1;#endif	    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;	}	if (Done) {	    lc(cred);		/* let's lowercase them for our convenience */	    have_serverblob = 0;	    Done = FALSE;	    if (Negotiate_packet_debug_enabled) {		printf("AF %s %s\n", c, cred);		decoded = base64_decode(c);		debug("sending 'AF' %s to squid with data:\n", cred);		hex_dump(decoded, (strlen(c) * 3) / 4);	    } else {		SEND3("AF %s %s", c, cred);	    }	    return 1;	} else {	    if (Negotiate_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);	    } else		SEND2("TT %s", c);	    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, NEGOTIATE_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);}