source4/utils/ntlm_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind status program.
   5
   6    Copyright (C) Tim Potter      2000-2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2004
   8    Copyright (C) Francesco Chemolli <kinkie@kame.usr.dsi.unimi.it> 2000
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "dynconfig.h"
  27 #include "system/filesys.h"
  28 #include "system/passwd.h"
  29 #include "lib/cmdline/popt_common.h"
  30 #include "auth/auth.h"
  31 #include "librpc/gen_ndr/ndr_security.h"
  32
  33 #define SQUID_BUFFER_SIZE 2010
  34
  35 enum stdio_helper_mode {
  36         SQUID_2_4_BASIC,
  37         SQUID_2_5_BASIC,
  38         SQUID_2_5_NTLMSSP,
  39         NTLMSSP_CLIENT_1,
  40         GSS_SPNEGO_CLIENT,
  41         GSS_SPNEGO_SERVER,
  42         NTLM_SERVER_1,
  43         NUM_HELPER_MODES
  44 };
  45
  46 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  47 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  48
  49
  50 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  51                                       char *buf, int length, void **private,
  52                                       unsigned int mux_id, void **private2);
  53
  54 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  55                                         char *buf, int length, void **private,
  56                                         unsigned int mux_id, void **private2);
  57
  58 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  59                                    char *buf, int length, void **private,
  60                                    unsigned int mux_id, void **private2);
  61
  62 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  63                                           char *buf, int length, void **private,
  64                                           unsigned int mux_id, void **private2);
  65
  66 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  67                                  stdio_helper_function fn, void **private2);
  68
  69 static const struct {
  70         enum stdio_helper_mode mode;
  71         const char *name;
  72         stdio_helper_function fn;
  73 } stdio_helper_protocols[] = {
  74         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  75         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  76         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  77         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  78         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  79         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  80         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  81         { NUM_HELPER_MODES, NULL, NULL}
  82 };
  83
  84 extern int winbindd_fd;
  85
  86 static const char *opt_username;
  87 static const char *opt_domain;
  88 static const char *opt_workstation;
  89 static const char *opt_password;
  90 static int opt_multiplex;
  91
  92
  93 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
  94
  95 static void mux_printf(unsigned int mux_id, const char *format, ...)
  96 {
  97         va_list ap;
  98
  99         if (opt_multiplex) {
 100                 x_fprintf(x_stdout, "%d ", mux_id);
 101         }
 102
 103         va_start(ap, format);
 104         x_vfprintf(x_stdout, format, ap);
 105         va_end(ap);
 106 }
 107
 108
 109
 110 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 111    form DOMAIN/user into a domain and a user */
 112
 113 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 114                                         fstring user)
 115 {
 116
 117         char *p = strchr(domuser,*lp_winbind_separator());
 118
 119         if (!p) {
 120                 return False;
 121         }
 122
 123         fstrcpy(user, p+1);
 124         fstrcpy(domain, domuser);
 125         domain[PTR_DIFF(p, domuser)] = 0;
 126
 127         return True;
 128 }
 129
 130 /* Authenticate a user with a plaintext password */
 131
 132 static BOOL check_plaintext_auth(const char *user, const char *pass,
 133                                  BOOL stdout_diagnostics)
 134 {
 135         return (strcmp(pass, opt_password) == 0);
 136 }
 137
 138 /* authenticate a user with an encrypted username/password */
 139
 140 static NTSTATUS local_pw_check_specified(const char *username,
 141                                          const char *domain,
 142                                          const char *workstation,
 143                                          const DATA_BLOB *challenge,
 144                                          const DATA_BLOB *lm_response,
 145                                          const DATA_BLOB *nt_response,
 146                                          uint32_t flags,
 147                                          DATA_BLOB *lm_session_key,
 148                                          DATA_BLOB *user_session_key,
 149                                          char **error_string,
 150                                          char **unix_name)
 151 {
 152         NTSTATUS nt_status;
 153         struct samr_Password lm_pw, nt_pw;
 154         struct samr_Password *lm_pwd, *nt_pwd;
 155         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 156         if (!mem_ctx) {
 157                 nt_status = NT_STATUS_NO_MEMORY;
 158         } else {
 159
 160                 E_md4hash(opt_password, nt_pw.hash);
 161                 if (E_deshash(opt_password, lm_pw.hash)) {
 162                         lm_pwd = &lm_pw;
 163                 } else {
 164                         lm_pwd = NULL;
 165                 }
 166                 nt_pwd = &nt_pw;
 167
 168
 169                 nt_status = ntlm_password_check(mem_ctx,
 170                                                 challenge,
 171                                                 lm_response,
 172                                                 nt_response,
 173                                                 username,
 174                                                 username,
 175                                                 domain,
 176                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 177
 178                 if (NT_STATUS_IS_OK(nt_status)) {
 179                         if (unix_name) {
 180                                 asprintf(unix_name,
 181                                          "%s%c%s", domain,
 182                                          *lp_winbind_separator(),
 183                                          username);
 184                         }
 185                 } else {
 186                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 187                                   domain, username, workstation,
 188                                   nt_errstr(nt_status)));
 189                 }
 190                 talloc_free(mem_ctx);
 191         }
 192         if (error_string) {
 193                 *error_string = strdup(nt_errstr(nt_status));
 194         }
 195         return nt_status;
 196
 197
 198 }
 199
 200 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 201                                        char *buf, int length, void **private,
 202                                        unsigned int mux_id, void **private2)
 203 {
 204         char *user, *pass;
 205         user=buf;
 206
 207         pass=memchr(buf,' ',length);
 208         if (!pass) {
 209                 DEBUG(2, ("Password not found. Denying access\n"));
 210                 mux_printf(mux_id, "ERR\n");
 211                 return;
 212         }
 213         *pass='\0';
 214         pass++;
 215
 216         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 217                 rfc1738_unescape(user);
 218                 rfc1738_unescape(pass);
 219         }
 220
 221         if (check_plaintext_auth(user, pass, False)) {
 222                 mux_printf(mux_id, "OK\n");
 223         } else {
 224                 mux_printf(mux_id, "ERR\n");
 225         }
 226 }
 227
 228 /* This is a bit hairy, but the basic idea is to do a password callback
 229    to the calling application.  The callback comes from within gensec */
 230
 231 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 232                                          char *buf, int length, void **private,
 233                                          unsigned int mux_id, void **password)
 234 {
 235         DATA_BLOB in;
 236         if (strlen(buf) < 2) {
 237                 DEBUG(1, ("query [%s] invalid", buf));
 238                 mux_printf(mux_id, "BH\n");
 239                 return;
 240         }
 241
 242         if (strlen(buf) > 3) {
 243                 in = base64_decode_data_blob(NULL, buf + 3);
 244         } else {
 245                 in = data_blob(NULL, 0);
 246         }
 247
 248         if (strncmp(buf, "PW ", 3) == 0) {
 249
 250                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 251                                            (const char *)in.data, in.length);
 252
 253                 if (*password == NULL) {
 254                         DEBUG(1, ("Out of memory\n"));
 255                         mux_printf(mux_id, "BH\n");
 256                         data_blob_free(&in);
 257                         return;
 258                 }
 259
 260                 mux_printf(mux_id, "OK\n");
 261                 data_blob_free(&in);
 262                 return;
 263         }
 264         DEBUG(1, ("Asked for (and expected) a password\n"));
 265         mux_printf(mux_id, "BH\n");
 266         data_blob_free(&in);
 267 }
 268
 269 /**
 270  * Callback for password credentails.  This is not async, and when
 271  * GENSEC and the credentails code is made async, it will look rather
 272  * different.
 273  */
 274
 275 static const char *get_password(struct cli_credentials *credentials)
 276 {
 277         char *password = NULL;
 278
 279         /* Ask for a password */
 280         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 281         credentials->priv_data = NULL;
 282
 283         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 284         return password;
 285 }
 286
 287 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 288                                   char *buf, int length, void **private,
 289                                   unsigned int mux_id, void **private2)
 290 {
 291         DATA_BLOB in;
 292         DATA_BLOB out = data_blob(NULL, 0);
 293         char *out_base64 = NULL;
 294         const char *reply_arg = NULL;
 295         struct gensec_security **gensec_state = (struct gensec_security **)private;
 296         NTSTATUS nt_status;
 297         BOOL first = False;
 298         const char *reply_code;
 299         struct cli_credentials *creds;
 300
 301         TALLOC_CTX *mem_ctx;
 302
 303         if (strlen(buf) < 2) {
 304                 DEBUG(1, ("query [%s] invalid", buf));
 305                 mux_printf(mux_id, "BH\n");
 306                 return;
 307         }
 308
 309         if (strlen(buf) > 3) {
 310                 in = base64_decode_data_blob(NULL, buf + 3);
 311         } else {
 312                 in = data_blob(NULL, 0);
 313         }
 314
 315         if (strncmp(buf, "YR", 2) == 0) {
 316                 if (gensec_state && *gensec_state) {
 317                         talloc_free(*gensec_state);
 318                         *gensec_state = NULL;
 319                 }
 320         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 321                 /* do nothing */
 322                 data_blob_free(&in);
 323                 return;
 324         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 325                     (strncmp(buf, "KK ", 3) != 0) &&
 326                     (strncmp(buf, "AF ", 3) != 0) &&
 327                     (strncmp(buf, "NA ", 3) != 0) &&
 328                     (strncmp(buf, "UG", 2) != 0) &&
 329                     (strncmp(buf, "PW ", 3) != 0)) {
 330                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 331                 mux_printf(mux_id, "BH\n");
 332                 data_blob_free(&in);
 333                 return;
 334         }
 335
 336         /* setup gensec */
 337         if (!(gensec_state && *gensec_state)) {
 338                 switch (stdio_helper_mode) {
 339                 case GSS_SPNEGO_CLIENT:
 340                 case NTLMSSP_CLIENT_1:
 341                         /* setup the client side */
 342
 343                         nt_status = gensec_client_start(NULL, gensec_state, NULL);
 344                         if (!NT_STATUS_IS_OK(nt_status)) {
 345                                 exit(1);
 346                         }
 347
 348                         creds = cli_credentials_init(*gensec_state);
 349                         cli_credentials_set_conf(creds);
 350                         if (opt_username) {
 351                                 cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 352                         }
 353                         if (opt_domain) {
 354                                 cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 355                         }
 356                         if (opt_password) {
 357                                 cli_credentials_set_password(creds, opt_password, CRED_SPECIFIED);
 358                         } else {
 359                                 creds->password_obtained = CRED_CALLBACK;
 360                                 creds->password_cb = get_password;
 361                                 creds->priv_data = (void*)mux_id;
 362                         }
 363
 364                         gensec_set_credentials(*gensec_state, creds);
 365
 366                         break;
 367                 case GSS_SPNEGO_SERVER:
 368                 case SQUID_2_5_NTLMSSP:
 369                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, gensec_state, NULL))) {
 370                                 exit(1);
 371                         }
 372                         break;
 373                 default:
 374                         abort();
 375                 }
 376
 377                 switch (stdio_helper_mode) {
 378                 case GSS_SPNEGO_CLIENT:
 379                 case GSS_SPNEGO_SERVER:
 380                         nt_status = gensec_start_mech_by_oid(*gensec_state, GENSEC_OID_SPNEGO);
 381                         if (!in.length) {
 382                                 first = True;
 383                         }
 384                         break;
 385                 case NTLMSSP_CLIENT_1:
 386                         if (!in.length) {
 387                                 first = True;
 388                         }
 389                 case SQUID_2_5_NTLMSSP:
 390                         nt_status = gensec_start_mech_by_oid(*gensec_state, GENSEC_OID_NTLMSSP);
 391                         break;
 392                 default:
 393                         abort();
 394                 }
 395
 396                 if (!NT_STATUS_IS_OK(nt_status)) {
 397                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 398                         mux_printf(mux_id, "BH\n");
 399                         return;
 400                 }
 401         }
 402
 403         if (strncmp(buf, "PW ", 3) == 0) {
 404
 405                 cli_credentials_set_password((*gensec_state)->credentials,
 406                                              talloc_strndup((*gensec_state),
 407                                                             (const char *)in.data,
 408                                                             in.length),
 409                                              CRED_SPECIFIED);
 410                 mux_printf(mux_id, "OK\n");
 411                 data_blob_free(&in);
 412                 return;
 413         }
 414
 415         /* update */
 416         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 417
 418         if (strncmp(buf, "UG", 2) == 0) {
 419                 int i;
 420                 char *grouplist = NULL;
 421                 struct auth_session_info *session_info;
 422
 423                 if (!NT_STATUS_IS_OK(gensec_session_info(*gensec_state, &session_info))) {
 424                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 425                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 426                         data_blob_free(&in);
 427                         return;
 428                 }
 429
 430                 /* get the string onto the context */
 431                 grouplist = talloc_strdup(mem_ctx, "");
 432
 433                 for (i=0; i<session_info->security_token->num_sids; i++) {
 434                         struct security_token *token = session_info->security_token;
 435                         const char *sidstr = dom_sid_string(session_info,
 436                                                             token->sids[i]);
 437                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 438                 }
 439
 440                 mux_printf(mux_id, "GL %s\n", grouplist);
 441                 talloc_free(session_info);
 442                 data_blob_free(&in);
 443                 talloc_free(mem_ctx);
 444                 return;
 445         }
 446
 447         nt_status = gensec_update(*gensec_state, mem_ctx, in, &out);
 448
 449         /* don't leak 'bad password'/'no such user' info to the network client */
 450         nt_status = auth_nt_status_squash(nt_status);
 451
 452         if (out.length) {
 453                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 454         } else {
 455                 out_base64 = NULL;
 456         }
 457
 458         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 459                 reply_arg = "*";
 460                 if (first) {
 461                         reply_code = "YR";
 462                 } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 463                         reply_code = "KK";
 464                 } else if ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 465                         reply_code = "TT";
 466                 } else {
 467                         abort();
 468                 }
 469
 470
 471         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 472                 reply_code = "BH";
 473                 reply_arg = nt_errstr(nt_status);
 474                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 475         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 476                 reply_code = "BH";
 477                 reply_arg = nt_errstr(nt_status);
 478                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 479         } else if (!NT_STATUS_IS_OK(nt_status)) {
 480                 reply_code = "NA";
 481                 reply_arg = nt_errstr(nt_status);
 482                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 483         } else if /* OK */ ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 484                 struct auth_session_info *session_info;
 485
 486                 nt_status = gensec_session_info(*gensec_state, &session_info);
 487                 if (!NT_STATUS_IS_OK(nt_status)) {
 488                         reply_code = "BH";
 489                         reply_arg = nt_errstr(nt_status);
 490                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 491                 } else {
 492
 493                         reply_code = "AF";
 494                         reply_arg = talloc_asprintf(*gensec_state,
 495                                                     "%s%s%s", session_info->server_info->domain_name,
 496                                                     lp_winbind_separator(), session_info->server_info->account_name);
 497                         talloc_free(session_info);
 498                 }
 499         } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 500                 reply_code = "AF";
 501                 reply_arg = NULL;
 502         } else {
 503                 abort();
 504         }
 505
 506         switch (stdio_helper_mode) {
 507         case GSS_SPNEGO_SERVER:
 508                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 509                           out_base64 ? out_base64 : "*",
 510                           reply_arg ? reply_arg : "*");
 511                 break;
 512         default:
 513                 if (out_base64) {
 514                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 515                 } else if (reply_arg) {
 516                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 517                 } else {
 518                         mux_printf(mux_id, "%s\n", reply_code);
 519                 }
 520         }
 521
 522         talloc_free(mem_ctx);
 523         return;
 524 }
 525
 526 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 527                                          char *buf, int length, void **private,
 528                                          unsigned int mux_id, void **private2)
 529 {
 530         char *request, *parameter;
 531         static DATA_BLOB challenge;
 532         static DATA_BLOB lm_response;
 533         static DATA_BLOB nt_response;
 534         static char *full_username;
 535         static char *username;
 536         static char *domain;
 537         static char *plaintext_password;
 538         static BOOL ntlm_server_1_user_session_key;
 539         static BOOL ntlm_server_1_lm_session_key;
 540
 541         if (strequal(buf, ".")) {
 542                 if (!full_username && !username) {
 543                         mux_printf(mux_id, "Error: No username supplied!\n");
 544                 } else if (plaintext_password) {
 545                         /* handle this request as plaintext */
 546                         if (!full_username) {
 547                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 548                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 549                                         return;
 550                                 }
 551                         }
 552                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 553                                 mux_printf(mux_id, "Authenticated: Yes\n");
 554                         } else {
 555                                 mux_printf(mux_id, "Authenticated: No\n");
 556                         }
 557                 } else if (!lm_response.data && !nt_response.data) {
 558                         mux_printf(mux_id, "Error: No password supplied!\n");
 559                 } else if (!challenge.data) {
 560                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 561                 } else {
 562                         char *error_string = NULL;
 563                         DATA_BLOB lm_key;
 564                         DATA_BLOB user_session_key;
 565                         uint32_t flags = 0;
 566
 567                         if (full_username && !username) {
 568                                 fstring fstr_user;
 569                                 fstring fstr_domain;
 570
 571                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 572                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 573                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 574                                 }
 575                                 SAFE_FREE(username);
 576                                 SAFE_FREE(domain);
 577                                 username = smb_xstrdup(fstr_user);
 578                                 domain = smb_xstrdup(fstr_domain);
 579                         }
 580
 581                         if (!domain) {
 582                                 domain = smb_xstrdup(lp_workgroup());
 583                         }
 584
 585                         if (ntlm_server_1_lm_session_key)
 586                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 587
 588                         if (ntlm_server_1_user_session_key)
 589                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 590
 591                         if (!NT_STATUS_IS_OK(
 592                                     local_pw_check_specified(username,
 593                                                               domain,
 594                                                               lp_netbios_name(),
 595                                                               &challenge,
 596                                                               &lm_response,
 597                                                               &nt_response,
 598                                                               flags,
 599                                                               &lm_key,
 600                                                               &user_session_key,
 601                                                               &error_string,
 602                                                               NULL))) {
 603
 604                                 mux_printf(mux_id, "Authenticated: No\n");
 605                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 606                                 SAFE_FREE(error_string);
 607                         } else {
 608                                 static char zeros[16];
 609                                 char *hex_lm_key;
 610                                 char *hex_user_session_key;
 611
 612                                 mux_printf(mux_id, "Authenticated: Yes\n");
 613
 614                                 if (ntlm_server_1_lm_session_key
 615                                     && lm_key.length
 616                                     && (memcmp(zeros, lm_key.data,
 617                                                                 lm_key.length) != 0)) {
 618                                         hex_encode(lm_key.data,
 619                                                    lm_key.length,
 620                                                    &hex_lm_key);
 621                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 622                                         SAFE_FREE(hex_lm_key);
 623                                 }
 624
 625                                 if (ntlm_server_1_user_session_key
 626                                     && user_session_key.length
 627                                     && (memcmp(zeros, user_session_key.data,
 628                                                user_session_key.length) != 0)) {
 629                                         hex_encode(user_session_key.data,
 630                                                    user_session_key.length,
 631                                                    &hex_user_session_key);
 632                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 633                                         SAFE_FREE(hex_user_session_key);
 634                                 }
 635                         }
 636                 }
 637                 /* clear out the state */
 638                 challenge = data_blob(NULL, 0);
 639                 nt_response = data_blob(NULL, 0);
 640                 lm_response = data_blob(NULL, 0);
 641                 SAFE_FREE(full_username);
 642                 SAFE_FREE(username);
 643                 SAFE_FREE(domain);
 644                 SAFE_FREE(plaintext_password);
 645                 ntlm_server_1_user_session_key = False;
 646                 ntlm_server_1_lm_session_key = False;
 647                 mux_printf(mux_id, ".\n");
 648
 649                 return;
 650         }
 651
 652         request = buf;
 653
 654         /* Indicates a base64 encoded structure */
 655         parameter = strstr(request, ":: ");
 656         if (!parameter) {
 657                 parameter = strstr(request, ": ");
 658
 659                 if (!parameter) {
 660                         DEBUG(0, ("Parameter not found!\n"));
 661                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 662                         return;
 663                 }
 664
 665                 parameter[0] ='\0';
 666                 parameter++;
 667                 parameter[0] ='\0';
 668                 parameter++;
 669
 670         } else {
 671                 parameter[0] ='\0';
 672                 parameter++;
 673                 parameter[0] ='\0';
 674                 parameter++;
 675                 parameter[0] ='\0';
 676                 parameter++;
 677
 678                 base64_decode_inplace(parameter);
 679         }
 680
 681         if (strequal(request, "LANMAN-Challenge")) {
 682                 challenge = strhex_to_data_blob(parameter);
 683                 if (challenge.length != 8) {
 684                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 685                                   parameter,
 686                                   (int)challenge.length);
 687                         challenge = data_blob(NULL, 0);
 688                 }
 689         } else if (strequal(request, "NT-Response")) {
 690                 nt_response = strhex_to_data_blob(parameter);
 691                 if (nt_response.length < 24) {
 692                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 693                                   parameter,
 694                                   (int)nt_response.length);
 695                         nt_response = data_blob(NULL, 0);
 696                 }
 697         } else if (strequal(request, "LANMAN-Response")) {
 698                 lm_response = strhex_to_data_blob(parameter);
 699                 if (lm_response.length != 24) {
 700                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 701                                   parameter,
 702                                   (int)lm_response.length);
 703                         lm_response = data_blob(NULL, 0);
 704                 }
 705         } else if (strequal(request, "Password")) {
 706                 plaintext_password = smb_xstrdup(parameter);
 707         } else if (strequal(request, "NT-Domain")) {
 708                 domain = smb_xstrdup(parameter);
 709         } else if (strequal(request, "Username")) {
 710                 username = smb_xstrdup(parameter);
 711         } else if (strequal(request, "Full-Username")) {
 712                 full_username = smb_xstrdup(parameter);
 713         } else if (strequal(request, "Request-User-Session-Key")) {
 714                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 715         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 716                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 717         } else {
 718                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 719         }
 720 }
 721
 722 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 723                                  stdio_helper_function fn, void **private2)
 724 {
 725         char buf[SQUID_BUFFER_SIZE+1];
 726         unsigned int mux_id;
 727         int length;
 728         char *c;
 729         static BOOL err;
 730         struct mux_private {
 731                 unsigned int max_mux;
 732                 void **private_pointers;
 733         };
 734
 735         static struct mux_private *mux_private;
 736         static void *normal_private;
 737         void **private;
 738
 739         /* this is not a typo - x_fgets doesn't work too well under squid */
 740         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 741                 if (ferror(stdin)) {
 742                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 743                                   strerror(ferror(stdin))));
 744
 745                         exit(1);    /* BIIG buffer */
 746                 }
 747                 exit(0);
 748         }
 749
 750         c=memchr(buf,'\n',sizeof(buf)-1);
 751         if (c) {
 752                 *c = '\0';
 753                 length = c-buf;
 754         } else {
 755                 err = 1;
 756                 return;
 757         }
 758         if (err) {
 759                 DEBUG(0, ("Oversized message\n"));
 760                 x_fprintf(x_stdout, "ERR\n");
 761                 err = 0;
 762                 return;
 763         }
 764
 765         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 766
 767         if (buf[0] == '\0') {
 768                 DEBUG(0, ("Invalid Request (empty)\n"));
 769                 x_fprintf(x_stdout, "ERR\n");
 770                 return;
 771         }
 772
 773         if (opt_multiplex) {
 774                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 775                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 776                         x_fprintf(x_stdout, "ERR\n");
 777                         return;
 778                 }
 779                 if (!mux_private) {
 780                         mux_private = talloc(NULL, struct mux_private);
 781                         mux_private->max_mux = 0;
 782                         mux_private->private_pointers = NULL;
 783                 }
 784
 785                 c=strchr(buf,' ');
 786                 if (!c) {
 787                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 788                         x_fprintf(x_stdout, "ERR\n");
 789                         return;
 790                 }
 791                 c++;
 792                 if (mux_id >= mux_private->max_mux) {
 793                         unsigned int prev_max = mux_private->max_mux;
 794                         mux_private->max_mux = mux_id + 1;
 795                         mux_private->private_pointers
 796                                 = talloc_realloc(mux_private,
 797                                                    mux_private->private_pointers,
 798                                                    void *, mux_private->max_mux);
 799                         memset(&mux_private->private_pointers[prev_max], '\0',
 800                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 801                 };
 802
 803                 private = &mux_private->private_pointers[mux_id];
 804         } else {
 805                 c = buf;
 806                 private = &normal_private;
 807         }
 808
 809         fn(helper_mode, c, length, private, mux_id, private2);
 810 }
 811
 812 static void squid_stream(enum stdio_helper_mode stdio_mode,
 813                          stdio_helper_function fn) {
 814         /* initialize FDescs */
 815         x_setbuf(x_stdout, NULL);
 816         x_setbuf(x_stderr, NULL);
 817         while(1) {
 818                 manage_squid_request(stdio_mode, fn, NULL);
 819         }
 820 }
 821
 822
 823 /* Main program */
 824
 825 enum {
 826         OPT_USERNAME = 1000,
 827         OPT_DOMAIN,
 828         OPT_WORKSTATION,
 829         OPT_CHALLENGE,
 830         OPT_RESPONSE,
 831         OPT_LM,
 832         OPT_NT,
 833         OPT_PASSWORD,
 834         OPT_LM_KEY,
 835         OPT_USER_SESSION_KEY,
 836         OPT_DIAGNOSTICS,
 837         OPT_REQUIRE_MEMBERSHIP,
 838         OPT_MULTIPLEX,
 839 };
 840
 841  int main(int argc, const char **argv)
 842 {
 843         static const char *helper_protocol;
 844         int opt;
 845
 846         poptContext pc;
 847
 848         /* NOTE: DO NOT change this interface without considering the implications!
 849            This is an external interface, which other programs will use to interact
 850            with this helper.
 851         */
 852
 853         /* We do not use single-letter command abbreviations, because they harm future
 854            interface stability. */
 855
 856         struct poptOption long_options[] = {
 857                 POPT_AUTOHELP
 858                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 859                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 860                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 861                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 862                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 863                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 864                 POPT_COMMON_SAMBA
 865                 POPT_TABLEEND
 866         };
 867
 868         /* Samba client initialisation */
 869
 870         setup_logging(NULL, DEBUG_STDERR);
 871
 872         /* Parse options */
 873
 874         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 875
 876         /* Parse command line options */
 877
 878         if (argc == 1) {
 879                 poptPrintHelp(pc, stderr, 0);
 880                 return 1;
 881         }
 882
 883         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 884                             POPT_CONTEXT_KEEP_FIRST);
 885
 886         while((opt = poptGetNextOpt(pc)) != -1) {
 887                 if (opt < -1) {
 888                         break;
 889                 }
 890         }
 891         if (opt < -1) {
 892                 fprintf(stderr, "%s: %s\n",
 893                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 894                         poptStrerror(opt));
 895                 return 1;
 896         }
 897
 898         ntlm_auth_init_subsystems;
 899
 900
 901         if (opt_domain == NULL) {
 902                 opt_domain = lp_workgroup();
 903         }
 904
 905         if (helper_protocol) {
 906                 int i;
 907                 for (i=0; i<NUM_HELPER_MODES; i++) {
 908                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 909                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 910                                 exit(0);
 911                         }
 912                 }
 913                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 914
 915                 for (i=0; i<NUM_HELPER_MODES; i++) {
 916                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 917                 }
 918
 919                 exit(1);
 920         }
 921
 922         if (!opt_username) {
 923                 x_fprintf(x_stderr, "username must be specified!\n\n");
 924                 poptPrintHelp(pc, stderr, 0);
 925                 exit(1);
 926         }
 927
 928         if (opt_workstation == NULL) {
 929                 opt_workstation = lp_netbios_name();
 930         }
 931
 932         if (!opt_password) {
 933                 opt_password = getpass("password: ");
 934         }
 935
 936         {
 937                 char *user;
 938
 939                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
 940                 if (!check_plaintext_auth(user, opt_password, True)) {
 941                         return 1;
 942                 }
 943         }
 944
 945         /* Exit code */
 946
 947         poptFreeContext(pc);
 948         return 0;
 949 }