helpers/negotiate_auth/SSPI/negotiate_sspi_auth.cc

   1 /*
   2  * Copyright (C) 1996-2014 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /*
  10  * negotiate_sspi_auth: helper for Negotiate Authentication for Squid Cache
  11  *
  12  * (C)2005 Guido Serassio - Acme Consulting S.r.l.
  13  *
  14  * Authors:
  15  *  Guido Serassio <guido.serassio@acmeconsulting.it>
  16  *  Acme Consulting S.r.l., Italy <http://www.acmeconsulting.it>
  17  *
  18  * With contributions from others mentioned in the change history section
  19  * below.
  20  *
  21  * Based on previous work of Francesco Chemolli and Robert Collins.
  22  *
  23  * Dependencies: Windows 2000 and later.
  24  *
  25  * This program is free software; you can redistribute it and/or modify
  26  * it under the terms of the GNU General Public License as published by
  27  * the Free Software Foundation; either version 2 of the License, or
  28  * (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  38  *
  39  * History:
  40  *
  41  * Version 1.0
  42  * 29-10-2005 Guido Serassio
  43  *              First release.
  44  */
  45
  46 #include "squid.h"
  47 #include "base64.h"
  48 #include "helpers/defines.h"
  49 #include "ntlmauth/ntlmauth.h"
  50 #include "ntlmauth/support_bits.cci"
  51 #include "sspwin32.h"
  52 #include "util.h"
  53
  54 #include <windows.h>
  55 #include <sspi.h>
  56 #include <security.h>
  57 #if HAVE_GETOPT_H
  58 #include <getopt.h>
  59 #endif
  60 #if HAVE_CTYPE_H
  61 #include <ctype.h>
  62 #endif
  63
  64 int Negotiate_packet_debug_enabled = 0;
  65 static int have_serverblob;
  66
  67 /* A couple of harmless helper macros */
  68 #define SEND(X) debug("sending '%s' to squid\n",X); printf(X "\n");
  69 #ifdef __GNUC__
  70 #define SEND2(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  71 #define SEND3(X,Y...) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  72 #else
  73 /* no gcc, no debugging. varargs macros are a gcc extension */
  74 #define SEND2(X,Y) debug("sending '" X "' to squid\n",Y); printf(X "\n",Y);
  75 #define SEND3(X,Y,Z) debug("sending '" X "' to squid\n",Y,Z); printf(X "\n",Y,Z);
  76 #endif
  77
  78 char *negotiate_check_auth(SSP_blobP auth, int auth_length);
  79
  80 /*
  81  * options:
  82  * -d enable debugging.
  83  * -v enable verbose Negotiate packet debugging.
  84  */
  85 char *my_program_name = NULL;
  86
  87 void
  88 usage()
  89 {
  90     fprintf(stderr,
  91             "Usage: %s [-d] [-v] [-h]\n"
  92             " -d  enable debugging.\n"
  93             " -v  enable verbose Negotiate packet debugging.\n"
  94             " -h  this message\n\n",
  95             my_program_name);
  96 }
  97
  98 void
  99 process_options(int argc, char *argv[])
 100 {
 101     int opt, had_error = 0;
 102
 103     opterr = 0;
 104     while (-1 != (opt = getopt(argc, argv, "hdv"))) {
 105         switch (opt) {
 106         case 'd':
 107             debug_enabled = 1;
 108             break;
 109         case 'v':
 110             debug_enabled = 1;
 111             Negotiate_packet_debug_enabled = 1;
 112             break;
 113         case 'h':
 114             usage();
 115             exit(0);
 116         case '?':
 117             opt = optopt;
 118         /* fall thru to default */
 119         default:
 120             fprintf(stderr, "ERROR: unknown option: -%c. Exiting\n", opt);
 121             usage();
 122             had_error = 1;
 123         }
 124     }
 125     if (had_error)
 126         exit(1);
 127 }
 128
 129 int
 130 manage_request()
 131 {
 132     char buf[HELPER_INPUT_BUFFER];
 133     char decoded[HELPER_INPUT_BUFFER];
 134     int decodedLen;
 135     char helper_command[3];
 136     char *c;
 137     int status;
 138     int oversized = 0;
 139     char *ErrorMessage;
 140     static char cred[SSP_MAX_CRED_LEN + 1];
 141     BOOL Done = FALSE;
 142
 143 try_again:
 144     if (fgets(buf, HELPER_INPUT_BUFFER, stdin))
 145         return 0;
 146
 147     c = static_cast<char*>(memchr(buf, '\n', HELPER_INPUT_BUFFER));
 148     if (c) {
 149         if (oversized) {
 150             SEND("BH illegal request received");
 151             fprintf(stderr, "ERROR: Illegal request received: '%s'\n", buf);
 152             return 1;
 153         }
 154         *c = '\0';
 155     } else {
 156         fprintf(stderr, "No newline in '%s'\n", buf);
 157         oversized = 1;
 158         goto try_again;
 159     }
 160
 161     if ((strlen(buf) > 3) && Negotiate_packet_debug_enabled) {
 162         decodedLen = base64_decode(decoded, sizeof(decoded), buf+3);
 163         strncpy(helper_command, buf, 2);
 164         debug("Got '%s' from Squid with data:\n", helper_command);
 165         hex_dump(reinterpret_cast<unsigned char*>(decoded), decodedLen);
 166     } else
 167         debug("Got '%s' from Squid\n", buf);
 168
 169     if (memcmp(buf, "YR ", 3) == 0) {   /* refresh-request */
 170         /* figure out what we got */
 171         decodedLen = base64_decode(decoded, sizeof(decoded), buf + 3);
 172         if ((size_t)decodedLen < sizeof(ntlmhdr)) {     /* decoding failure, return error */
 173             SEND("NA * Packet format error, couldn't base64-decode");
 174             return 1;
 175         }
 176         /* Obtain server blob against SSPI */
 177         c = (char *) SSP_MakeNegotiateBlob(decoded, decodedLen, &Done, &status, cred);
 178
 179         if (status == SSP_OK) {
 180             if (Done) {
 181                 lc(cred);   /* let's lowercase them for our convenience */
 182                 have_serverblob = 0;
 183                 Done = FALSE;
 184                 if (Negotiate_packet_debug_enabled) {
 185                     decodedLen = base64_decode(decoded, sizeof(decoded), c);
 186                     debug("sending 'AF' %s to squid with data:\n", cred);
 187                     if (c != NULL)
 188                         hex_dump(reinterpret_cast<unsigned char*>(decoded), decodedLen);
 189                     else
 190                         fprintf(stderr, "No data available.\n");
 191                     printf("AF %s %s\n", c, cred);
 192                 } else
 193                     SEND3("AF %s %s", c, cred);
 194             } else {
 195                 if (Negotiate_packet_debug_enabled) {
 196                     decodedLen = base64_decode(decoded, sizeof(decoded), c);
 197                     debug("sending 'TT' to squid with data:\n");
 198                     hex_dump(reinterpret_cast<unsigned char*>(decoded), decodedLen);
 199                     printf("TT %s\n", c);
 200                 } else {
 201                     SEND2("TT %s", c);
 202                 }
 203                 have_serverblob = 1;
 204             }
 205         } else
 206             SEND("BH can't obtain server blob");
 207         return 1;
 208     }
 209     if (memcmp(buf, "KK ", 3) == 0) {   /* authenticate-request */
 210         if (!have_serverblob) {
 211             SEND("BH invalid server blob");
 212             return 1;
 213         }
 214         /* figure out what we got */
 215         decodedLen = base64_decode(decoded, sizeof(decoded), buf+3);
 216         if ((size_t)decodedLen < sizeof(ntlmhdr)) {     /* decoding failure, return error */
 217             SEND("NA * Packet format error, couldn't base64-decode");
 218             return 1;
 219         }
 220         /* check against SSPI */
 221         c = (char *) SSP_ValidateNegotiateCredentials(decoded, decodedLen, &Done, &status, cred);
 222
 223         if (status == SSP_ERROR) {
 224             FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
 225                           FORMAT_MESSAGE_IGNORE_INSERTS,
 226                           NULL,
 227                           GetLastError(),
 228                           MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),    /* Default language */
 229                           (LPTSTR) & ErrorMessage,
 230                           0,
 231                           NULL);
 232             if (ErrorMessage[strlen(ErrorMessage) - 1] == '\n')
 233                 ErrorMessage[strlen(ErrorMessage) - 1] = '\0';
 234             if (ErrorMessage[strlen(ErrorMessage) - 1] == '\r')
 235                 ErrorMessage[strlen(ErrorMessage) - 1] = '\0';
 236             SEND2("NA * %s", ErrorMessage);
 237             LocalFree(ErrorMessage);
 238             return 1;
 239         }
 240         if (Done) {
 241             lc(cred);       /* let's lowercase them for our convenience */
 242             have_serverblob = 0;
 243             Done = FALSE;
 244             if (Negotiate_packet_debug_enabled) {
 245                 decodedLen = base64_decode(decoded, sizeof(decoded), c);
 246                 debug("sending 'AF' %s to squid with data:\n", cred);
 247                 if (c != NULL)
 248                     hex_dump(reinterpret_cast<unsigned char*>(decoded), decodedLen);
 249                 else
 250                     fprintf(stderr, "No data available.\n");
 251                 printf("AF %s %s\n", c, cred);
 252             } else {
 253                 SEND3("AF %s %s", c, cred);
 254             }
 255             return 1;
 256         } else {
 257             if (Negotiate_packet_debug_enabled) {
 258                 decodedLen = base64_decode(decoded, sizeof(decoded), c);
 259                 debug("sending 'TT' to squid with data:\n");
 260                 hex_dump(reinterpret_cast<unsigned char*>(decoded), decodedLen);
 261                 printf("TT %s\n", c);
 262             } else
 263                 SEND2("TT %s", c);
 264             return 1;
 265         }
 266
 267     } else {            /* not an auth-request */
 268         SEND("BH illegal request received");
 269         fprintf(stderr, "Illegal request received: '%s'\n", buf);
 270         return 1;
 271     }
 272     SEND("BH detected protocol error");
 273     return 1;
 274     /********* END ********/
 275 }
 276
 277 int
 278 main(int argc, char *argv[])
 279 {
 280     my_program_name = argv[0];
 281
 282     process_options(argc, argv);
 283
 284     debug("%s build " __DATE__ ", " __TIME__ " starting up...\n", my_program_name);
 285
 286     if (LoadSecurityDll(SSP_NTLM, NEGOTIATE_PACKAGE_NAME) == NULL) {
 287         fprintf(stderr, "FATAL: %s: can't initialize SSPI, exiting.\n", argv[0]);
 288         exit(1);
 289     }
 290     debug("SSPI initialized OK\n");
 291
 292     atexit(UnloadSecurityDll);
 293
 294     /* initialize FDescs */
 295     setbuf(stdout, NULL);
 296     setbuf(stderr, NULL);
 297
 298     while (manage_request()) {
 299         /* everything is done within manage_request */
 300     }
 301     exit(0);
 302 }
 303