helpers/ntlm_auth/fake/ntlm_fake_auth.cc

   1 /*
   2  * $Id$
   3  *
   4  * AUTHOR: Andrew Doran <ad@interlude.eu.org>
   5  * AUTHOR: Robert Collins <rbtcollins@hotmail.com>
   6  * AUTHOR: Guido Serassio: <guido.serassio@acmeconsulting.it>
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35 /*
  36  * Example ntlm authentication program for Squid, based on the
  37  * original proxy_auth code from client_side.c, written by
  38  * Jon Thackray <jrmt@uk.gdscorp.com>. Initial ntlm code by
  39  * Andrew Doran <ad@interlude.eu.org>.
  40  *
  41  * This code gets the username and returns it. No validation is done.
  42  * and by the way: it is a complete patch-up. Use the "real thing" NTLMSSP
  43  * if you can.
  44  *
  45  * Revised by Guido Serassio: <guido.serassio@acmeconsulting.it>
  46  *
  47  * - Added negotiation of UNICODE char support
  48  * - More detailed debugging info
  49  *
  50  */
  51
  52 /* undefine this to have strict protocol adherence. You don't really need
  53  * that though */
  54 #define IGNORANCE_IS_BLISS
  55
  56 #include "config.h"
  57 #include "base64.h"
  58 #include "helpers/defines.h"
  59 #include "ntlmauth/ntlmauth.h"
  60 #include "ntlmauth/support_bits.cci"
  61 //#include "util.h"
  62
  63 #if HAVE_CTYPE_H
  64 #include <ctype.h>
  65 #endif
  66 #if HAVE_STRING_H
  67 #include <string.h>
  68 #endif
  69 #if HAVE_CRYPT_H
  70 #include <crypt.h>
  71 #endif
  72 #if HAVE_PWD_H
  73 #include <pwd.h>
  74 #endif
  75 #if HAVE_GETOPT_H
  76 #include <getopt.h>
  77 #endif
  78
  79 /* A couple of harmless helper macros */
  80 #define SEND(X) debug("sending '%s' to squid\n",X); printf(X "\n");
  81 #ifdef __GNUC__
  82 #define SEND2(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  83 #define SEND4(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  84 #else
  85 /* no gcc, no debugging. varargs macros are a gcc extension */
  86 #define SEND2(X,Y) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  87 #define SEND4(X,Y,Z,W) debug("sending '" X "' to squid\n",Y,Z); printf(X "\n",Y,Z);
  88 #endif
  89
  90 const char *authenticate_ntlm_domain = "WORKGROUP";
  91 int strip_domain_enabled = 0;
  92 int NTLM_packet_debug_enabled = 0;
  93
  94 /*
  95  * options:
  96  * -d enable debugging.
  97  * -v enable verbose NTLM packet debugging.
  98  * -l if specified, changes behavior on failures to last-ditch.
  99  */
 100 char *my_program_name = NULL;
 101
 102 static void
 103 usage(void)
 104 {
 105     fprintf(stderr,
 106             "Usage: %s [-d] [-v] [-h]\n"
 107             " -d  enable debugging.\n"
 108             " -S  strip domain from username.\n"
 109             " -v  enable verbose NTLM packet debugging.\n"
 110             " -h  this message\n\n",
 111             my_program_name);
 112 }
 113
 114 static void
 115 process_options(int argc, char *argv[])
 116 {
 117     int opt, had_error = 0;
 118
 119     opterr = 0;
 120     while (-1 != (opt = getopt(argc, argv, "hdvS"))) {
 121         switch (opt) {
 122         case 'd':
 123             debug_enabled = 1;
 124             break;
 125         case 'v':
 126             debug_enabled = 1;
 127             NTLM_packet_debug_enabled = 1;
 128             break;
 129         case 'S':
 130             strip_domain_enabled = 1;
 131             break;
 132         case 'h':
 133             usage();
 134             exit(0);
 135         case '?':
 136             opt = optopt;
 137             /* fall thru to default */
 138         default:
 139             fprintf(stderr, "unknown option: -%c. Exiting\n", opt);
 140             usage();
 141             had_error = 1;
 142         }
 143     }
 144     if (had_error)
 145         exit(1);
 146 }
 147
 148 int
 149 main(int argc, char *argv[])
 150 {
 151     char buf[HELPER_INPUT_BUFFER];
 152     int buflen = 0;
 153     char user[NTLM_MAX_FIELD_LENGTH], domain[NTLM_MAX_FIELD_LENGTH];
 154     char *p;
 155     ntlmhdr *packet = NULL;
 156     char helper_command[3];
 157     int len;
 158     char *data = NULL;
 159
 160     setbuf(stdout, NULL);
 161     setbuf(stderr, NULL);
 162
 163     my_program_name = argv[0];
 164
 165     process_options(argc, argv);
 166
 167     debug("%s build " __DATE__ ", " __TIME__ " starting up...\n", my_program_name);
 168
 169     while (fgets(buf, HELPER_INPUT_BUFFER, stdin) != NULL) {
 170         user[0] = '\0';         /*no user code */
 171         domain[0] = '\0';               /*no domain code */
 172
 173         if ((p = strchr(buf, '\n')) != NULL)
 174             *p = '\0';          /* strip \n */
 175         buflen = strlen(buf);   /* keep this so we only scan the buffer for \0 once per loop */
 176         if (buflen > 3)
 177             packet = (ntlmhdr*)base64_decode(buf + 3);
 178         if (buflen > 3 && NTLM_packet_debug_enabled) {
 179             strncpy(helper_command, buf, 2);
 180             helper_command[2] = '\0';
 181             debug("Got '%s' from Squid with data:\n", helper_command);
 182             hex_dump((unsigned char*)packet, ((buflen - 3) * 3) / 4);
 183         } else
 184             debug("Got '%s' from Squid\n", buf);
 185
 186         if (strncasecmp(buf, "YR", 2) == 0) {
 187             char nonce[NTLM_NONCE_LEN];
 188             ntlm_challenge chal;
 189             ntlm_make_nonce(nonce);
 190             if (buflen > 3) {
 191                 ntlm_negotiate *nego = (ntlm_negotiate *)packet;
 192                 ntlm_make_challenge(&chal, authenticate_ntlm_domain, NULL, nonce, NTLM_NONCE_LEN, nego->flags);
 193             } else {
 194                 ntlm_make_challenge(&chal, authenticate_ntlm_domain, NULL, nonce, NTLM_NONCE_LEN, NTLM_NEGOTIATE_ASCII);
 195             }
 196             // TODO: find out what this context means, and why only the fake auth helper contains it.
 197             chal.context_high = htole32(0x003a<<16);
 198
 199             len = sizeof(chal) - sizeof(chal.payload) + le16toh(chal.target.maxlen);
 200             data = (char *) base64_encode_bin((char *) &chal, len);
 201             if (NTLM_packet_debug_enabled) {
 202                 printf("TT %s\n", data);
 203                 debug("sending 'TT' to squid with data:\n");
 204                 hex_dump((unsigned char *)&chal, len);
 205             } else
 206                 SEND2("TT %s", data);
 207         } else if (strncasecmp(buf, "KK ", 3) == 0) {
 208             if (!packet) {
 209                 SEND("BH received KK with no data! user=");
 210             } else if (ntlm_validate_packet(packet, NTLM_AUTHENTICATE) == NTLM_ERR_NONE) {
 211                 if (ntlm_unpack_auth((ntlm_authenticate *)packet, user, domain, (buflen-3)) == NTLM_ERR_NONE) {
 212                     lc(user);
 213                     lc(domain);
 214                     if (strip_domain_enabled) {
 215                         SEND2("AF %s", user);
 216                     } else {
 217                         SEND4("AF %s%s%s", domain, (*domain?"\\":""), user);
 218                     }
 219                 } else {
 220                     lc(user);
 221                     lc(domain);
 222                     SEND4("NA invalid credentials, user=%s%s%s", domain, (*domain?"\\":""), user);
 223                 }
 224             } else {
 225                 SEND("BH wrong packet type! user=");
 226             }
 227         }
 228     }
 229     exit(0);
 230 }