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/passwd.h"
  28 #include "lib/cmdline/popt_common.h"
  29 #include "auth/auth.h"
  30 #include "asn_1.h"
  31
  32 #undef DBGC_CLASS
  33 #define DBGC_CLASS DBGC_WINBIND
  34
  35 #define SQUID_BUFFER_SIZE 2010
  36
  37 enum stdio_helper_mode {
  38         SQUID_2_4_BASIC,
  39         SQUID_2_5_BASIC,
  40         SQUID_2_5_NTLMSSP,
  41         NTLMSSP_CLIENT_1,
  42         GSS_SPNEGO_CLIENT,
  43         GSS_SPNEGO_SERVER,
  44         NTLM_SERVER_1,
  45         NUM_HELPER_MODES
  46 };
  47
  48 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  49 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  50
  51
  52 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  53                                       char *buf, int length, void **private,
  54                                       unsigned int mux_id);
  55
  56 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  57                                         char *buf, int length, void **private,
  58                                         unsigned int mux_id);
  59
  60 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  61                                    char *buf, int length, void **private,
  62                                    unsigned int mux_id);
  63
  64 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  65                                           char *buf, int length, void **private,
  66                                           unsigned int mux_id);
  67
  68 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  69                                  stdio_helper_function fn);
  70
  71 static const struct {
  72         enum stdio_helper_mode mode;
  73         const char *name;
  74         stdio_helper_function fn;
  75 } stdio_helper_protocols[] = {
  76         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  77         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  78         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  79         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  80         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  81         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  82         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  83         { NUM_HELPER_MODES, NULL, NULL}
  84 };
  85
  86 extern int winbindd_fd;
  87
  88 const char *opt_username;
  89 const char *opt_domain;
  90 const char *opt_workstation;
  91 const char *opt_password;
  92 int opt_multiplex;
  93
  94
  95 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
  96
  97 static void mux_printf(unsigned int mux_id, const char *format, ...)
  98 {
  99         va_list ap;
 100
 101         if (opt_multiplex) {
 102                 x_fprintf(x_stdout, "%d ", mux_id);
 103         }
 104
 105         va_start(ap, format);
 106         x_vfprintf(x_stdout, format, ap);
 107         va_end(ap);
 108 }
 109
 110
 111
 112 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 113    form DOMAIN/user into a domain and a user */
 114
 115 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 116                                         fstring user)
 117 {
 118
 119         char *p = strchr(domuser,*lp_winbind_separator());
 120
 121         if (!p) {
 122                 return False;
 123         }
 124
 125         fstrcpy(user, p+1);
 126         fstrcpy(domain, domuser);
 127         domain[PTR_DIFF(p, domuser)] = 0;
 128
 129         return True;
 130 }
 131
 132 /* Authenticate a user with a plaintext password */
 133
 134 static BOOL check_plaintext_auth(const char *user, const char *pass,
 135                                  BOOL stdout_diagnostics)
 136 {
 137         return (strcmp(pass, opt_password) == 0);
 138 }
 139
 140 /* authenticate a user with an encrypted username/password */
 141
 142 static NTSTATUS local_pw_check_specified(const char *username,
 143                                          const char *domain,
 144                                          const char *workstation,
 145                                          const DATA_BLOB *challenge,
 146                                          const DATA_BLOB *lm_response,
 147                                          const DATA_BLOB *nt_response,
 148                                          uint32 flags,
 149                                          DATA_BLOB *lm_session_key,
 150                                          DATA_BLOB *user_session_key,
 151                                          char **error_string,
 152                                          char **unix_name)
 153 {
 154         NTSTATUS nt_status;
 155         uint8_t lm_pw[16], nt_pw[16];
 156         uint8_t *lm_pwd, *nt_pwd;
 157         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 158         if (!mem_ctx) {
 159                 nt_status = NT_STATUS_NO_MEMORY;
 160         } else {
 161
 162                 E_md4hash(opt_password, nt_pw);
 163                 if (E_deshash(opt_password, lm_pw)) {
 164                         lm_pwd = lm_pw;
 165                 } else {
 166                         lm_pwd = NULL;
 167                 }
 168                 nt_pwd = nt_pw;
 169
 170
 171                 nt_status = ntlm_password_check(mem_ctx,
 172                                                 challenge,
 173                                                 lm_response,
 174                                                 nt_response,
 175                                                 NULL, NULL,
 176                                                 username,
 177                                                 username,
 178                                                 domain,
 179                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 180
 181                 if (NT_STATUS_IS_OK(nt_status)) {
 182                         if (unix_name) {
 183                                 asprintf(unix_name,
 184                                          "%s%c%s", domain,
 185                                          *lp_winbind_separator(),
 186                                          username);
 187                         }
 188                 } else {
 189                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 190                                   domain, username, workstation,
 191                                   nt_errstr(nt_status)));
 192                 }
 193                 talloc_destroy(mem_ctx);
 194         }
 195         if (error_string) {
 196                 *error_string = strdup(nt_errstr(nt_status));
 197         }
 198         return nt_status;
 199
 200
 201 }
 202
 203 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 204                                        char *buf, int length, void **private,
 205                                        unsigned int mux_id)
 206 {
 207         char *user, *pass;
 208         user=buf;
 209
 210         pass=memchr(buf,' ',length);
 211         if (!pass) {
 212                 DEBUG(2, ("Password not found. Denying access\n"));
 213                 mux_printf(mux_id, "ERR\n");
 214                 return;
 215         }
 216         *pass='\0';
 217         pass++;
 218
 219         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 220                 rfc1738_unescape(user);
 221                 rfc1738_unescape(pass);
 222         }
 223
 224         if (check_plaintext_auth(user, pass, False)) {
 225                 mux_printf(mux_id, "OK\n");
 226         } else {
 227                 mux_printf(mux_id, "ERR\n");
 228         }
 229 }
 230
 231 /* This is a bit hairy, but the basic idea is to do a password callback
 232    to the calling application.  The callback comes from within gensec */
 233
 234 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 235                                          char *buf, int length, void **private,
 236                                          unsigned int mux_id)
 237 {
 238         DATA_BLOB in;
 239         struct gensec_security **gensec_state = (struct gensec_security **)private;
 240         if (strlen(buf) < 2) {
 241                 DEBUG(1, ("query [%s] invalid", buf));
 242                 mux_printf(mux_id, "BH\n");
 243                 return;
 244         }
 245
 246         if (strlen(buf) > 3) {
 247                 in = base64_decode_data_blob(buf + 3);
 248         } else {
 249                 in = data_blob(NULL, 0);
 250         }
 251
 252         if (strncmp(buf, "PW ", 3) == 0) {
 253
 254                 (*gensec_state)->password_callback_private = talloc_strndup((*gensec_state),
 255                                                                             (const char *)in.data, in.length);
 256
 257                 if ((*gensec_state)->password_callback_private == NULL) {
 258                         DEBUG(1, ("Out of memory\n"));
 259                         mux_printf(mux_id, "BH\n");
 260                         data_blob_free(&in);
 261                         return;
 262                 }
 263
 264                 mux_printf(mux_id, "OK\n");
 265                 data_blob_free(&in);
 266                 return;
 267         }
 268         DEBUG(1, ("Asked for (and expected) a password\n"));
 269         mux_printf(mux_id, "BH\n");
 270         data_blob_free(&in);
 271 }
 272
 273 /*
 274  * Callback for gensec, to ask the calling application for a password.  Uses the above function
 275  * for the stdio part of this.
 276  */
 277
 278 static NTSTATUS get_password(struct gensec_security *gensec_security,
 279                              TALLOC_CTX *mem_ctx,
 280                              char **password)
 281 {
 282         *password = NULL;
 283
 284         /* Ask for a password */
 285         mux_printf((unsigned int)gensec_security->password_callback_private, "PW\n");
 286         gensec_security->password_callback_private = NULL;
 287
 288         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request);
 289         *password = (char *)gensec_security->password_callback_private;
 290         if (*password) {
 291                 return NT_STATUS_OK;
 292         } else {
 293                 return NT_STATUS_INVALID_PARAMETER;
 294         }
 295 }
 296
 297 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 298                                   char *buf, int length, void **private,
 299                                   unsigned int mux_id)
 300 {
 301         DATA_BLOB in;
 302         DATA_BLOB out = data_blob(NULL, 0);
 303         char *out_base64 = NULL;
 304         const char *reply_arg = NULL;
 305         struct gensec_security **gensec_state = (struct gensec_security **)private;
 306         NTSTATUS nt_status;
 307         BOOL first = False;
 308         const char *reply_code;
 309
 310         if (strlen(buf) < 2) {
 311                 DEBUG(1, ("query [%s] invalid", buf));
 312                 mux_printf(mux_id, "BH\n");
 313                 return;
 314         }
 315
 316         if (strlen(buf) > 3) {
 317                 in = base64_decode_data_blob(buf + 3);
 318         } else {
 319                 in = data_blob(NULL, 0);
 320         }
 321
 322         if (strncmp(buf, "YR", 2) == 0) {
 323                 if (gensec_state && *gensec_state) {
 324                         gensec_end(gensec_state);
 325                         *gensec_state = NULL;
 326                 }
 327         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 328                 /* do nothing */
 329                 data_blob_free(&in);
 330                 return;
 331         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 332                     (strncmp(buf, "KK ", 3) != 0) &&
 333                     (strncmp(buf, "AF ", 3) != 0) &&
 334                     (strncmp(buf, "NA ", 3) != 0) &&
 335                     (strncmp(buf, "UG", 2) != 0) &&
 336                     (strncmp(buf, "PW ", 3) != 0)) {
 337                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 338                 mux_printf(mux_id, "BH\n");
 339                 data_blob_free(&in);
 340                 return;
 341         }
 342
 343         /* setup gensec */
 344         if (!(gensec_state && *gensec_state)) {
 345                 switch (stdio_helper_mode) {
 346                 case GSS_SPNEGO_CLIENT:
 347                 case NTLMSSP_CLIENT_1:
 348                         /* setup the client side */
 349
 350                         if (!NT_STATUS_IS_OK(gensec_client_start(NULL, gensec_state))) {
 351                                 exit(1);
 352                         }
 353                         gensec_set_username(*gensec_state, opt_username);
 354                         gensec_set_domain(*gensec_state, opt_domain);
 355                         if (opt_password) {
 356                                 if (!NT_STATUS_IS_OK(gensec_set_password(*gensec_state, opt_password))) {
 357                                         DEBUG(1, ("Out of memory\n"));
 358                                         mux_printf(mux_id, "BH\n");
 359                                         data_blob_free(&in);
 360                                         return;
 361                                 }
 362                         } else {
 363                                 gensec_set_password_callback(*gensec_state, get_password, (void*)mux_id);
 364                         }
 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))) {
 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, 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, OID_NTLMSSP);
 391                         break;
 392                 default:
 393                         abort();
 394                 }
 395
 396                 if (!NT_STATUS_IS_OK(nt_status)) {
 397                         DEBUG(1, ("SPENGO login failed to initialise: %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                 if (!NT_STATUS_IS_OK(gensec_set_password(*gensec_state,
 406                                                          talloc_strndup((*gensec_state),
 407                                                                         (const char *)in.data,
 408                                                                         in.length)))) {
 409                         DEBUG(1, ("gensec_set_password failed: %s\n", nt_errstr(nt_status)));
 410                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 411                         data_blob_free(&in);
 412                         return;
 413                 }
 414
 415                 mux_printf(mux_id, "OK\n");
 416                 data_blob_free(&in);
 417                 return;
 418         }
 419
 420         if (strncmp(buf, "UG", 2) == 0) {
 421                 int i;
 422                 char *grouplist = NULL;
 423                 struct auth_session_info *session_info;
 424
 425                 if (!NT_STATUS_IS_OK(gensec_session_info(*gensec_state, &session_info))) {
 426                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 427                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 428                         data_blob_free(&in);
 429                         return;
 430                 }
 431
 432                 /* get the string onto the context */
 433                 grouplist = talloc_strdup(session_info, "");
 434
 435                 for (i=0; i< session_info->nt_user_token->num_sids; i++) {
 436                         grouplist = talloc_asprintf_append(grouplist, "%s,",
 437                                                            dom_sid_string(session_info,
 438                                                                           session_info->nt_user_token->user_sids[i]));
 439                 }
 440
 441                 mux_printf(mux_id, "GL %s\n", grouplist);
 442                 free_session_info(&session_info);
 443                 data_blob_free(&in);
 444                 return;
 445         }
 446
 447         /* update */
 448
 449         nt_status = gensec_update(*gensec_state, NULL, in, &out);
 450
 451         /* don't leak 'bad password'/'no such user' info to the network client */
 452         nt_status = nt_status_squash(nt_status);
 453
 454         if (out.length) {
 455                 out_base64 = base64_encode_data_blob(out);
 456         } else {
 457                 out_base64 = NULL;
 458         }
 459         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 460                 reply_arg = "*";
 461                 if (first) {
 462                         reply_code = "YR";
 463                 } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 464                         reply_code = "KK";
 465                 } else if ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 466                         reply_code = "TT";
 467                 } else {
 468                         abort();
 469                 }
 470
 471
 472         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 473                 reply_code = "BH";
 474                 reply_arg = nt_errstr(nt_status);
 475                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 476         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 477                 reply_code = "BH";
 478                 reply_arg = nt_errstr(nt_status);
 479                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 480         } else if (!NT_STATUS_IS_OK(nt_status)) {
 481                 reply_code = "NA";
 482                 reply_arg = nt_errstr(nt_status);
 483                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 484         } else if /* OK */ ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 485                 struct auth_session_info *session_info;
 486
 487                 nt_status = gensec_session_info(*gensec_state, &session_info);
 488                 if (!NT_STATUS_IS_OK(nt_status)) {
 489                         reply_code = "BH";
 490                         reply_arg = nt_errstr(nt_status);
 491                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 492                 } else {
 493
 494                         reply_code = "AF";
 495                         reply_arg = talloc_asprintf(*gensec_state,
 496                                                     "%s%s%s", session_info->server_info->domain,
 497                                                     lp_winbind_separator(), session_info->server_info->account_name);
 498                         talloc_free(session_info);
 499                 }
 500         } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 501                 reply_code = "AF";
 502                 reply_arg = NULL;
 503         } else {
 504                 abort();
 505         }
 506
 507         switch (stdio_helper_mode) {
 508         case GSS_SPNEGO_SERVER:
 509                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 510                           out_base64 ? out_base64 : "*",
 511                           reply_arg ? reply_arg : "*");
 512                 break;
 513         default:
 514                 if (out_base64) {
 515                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 516                 } else if (reply_arg) {
 517                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 518                 } else {
 519                         mux_printf(mux_id, "%s\n", reply_code);
 520                 }
 521         }
 522
 523         SAFE_FREE(out_base64);
 524         return;
 525 }
 526
 527 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 528                                          char *buf, int length, void **private,
 529                                          unsigned int mux_id)
 530 {
 531         char *request, *parameter;
 532         static DATA_BLOB challenge;
 533         static DATA_BLOB lm_response;
 534         static DATA_BLOB nt_response;
 535         static char *full_username;
 536         static char *username;
 537         static char *domain;
 538         static char *plaintext_password;
 539         static BOOL ntlm_server_1_user_session_key;
 540         static BOOL ntlm_server_1_lm_session_key;
 541
 542         if (strequal(buf, ".")) {
 543                 if (!full_username && !username) {
 544                         mux_printf(mux_id, "Error: No username supplied!\n");
 545                 } else if (plaintext_password) {
 546                         /* handle this request as plaintext */
 547                         if (!full_username) {
 548                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 549                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 550                                         return;
 551                                 }
 552                         }
 553                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 554                                 mux_printf(mux_id, "Authenticated: Yes\n");
 555                         } else {
 556                                 mux_printf(mux_id, "Authenticated: No\n");
 557                         }
 558                 } else if (!lm_response.data && !nt_response.data) {
 559                         mux_printf(mux_id, "Error: No password supplied!\n");
 560                 } else if (!challenge.data) {
 561                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 562                 } else {
 563                         char *error_string = NULL;
 564                         DATA_BLOB lm_key;
 565                         DATA_BLOB user_session_key;
 566                         uint32 flags = 0;
 567
 568                         if (full_username && !username) {
 569                                 fstring fstr_user;
 570                                 fstring fstr_domain;
 571
 572                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 573                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 574                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 575                                 }
 576                                 SAFE_FREE(username);
 577                                 SAFE_FREE(domain);
 578                                 username = smb_xstrdup(fstr_user);
 579                                 domain = smb_xstrdup(fstr_domain);
 580                         }
 581
 582                         if (!domain) {
 583                                 domain = smb_xstrdup(lp_workgroup());
 584                         }
 585
 586                         if (ntlm_server_1_lm_session_key)
 587                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 588
 589                         if (ntlm_server_1_user_session_key)
 590                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 591
 592                         if (!NT_STATUS_IS_OK(
 593                                     local_pw_check_specified(username,
 594                                                               domain,
 595                                                               lp_netbios_name(),
 596                                                               &challenge,
 597                                                               &lm_response,
 598                                                               &nt_response,
 599                                                               flags,
 600                                                               &lm_key,
 601                                                               &user_session_key,
 602                                                               &error_string,
 603                                                               NULL))) {
 604
 605                                 mux_printf(mux_id, "Authenticated: No\n");
 606                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 607                                 SAFE_FREE(error_string);
 608                         } else {
 609                                 static char zeros[16];
 610                                 char *hex_lm_key;
 611                                 char *hex_user_session_key;
 612
 613                                 mux_printf(mux_id, "Authenticated: Yes\n");
 614
 615                                 if (ntlm_server_1_lm_session_key
 616                                     && lm_key.length
 617                                     && (memcmp(zeros, lm_key.data,
 618                                                                 lm_key.length) != 0)) {
 619                                         hex_encode(lm_key.data,
 620                                                    lm_key.length,
 621                                                    &hex_lm_key);
 622                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 623                                         SAFE_FREE(hex_lm_key);
 624                                 }
 625
 626                                 if (ntlm_server_1_user_session_key
 627                                     && user_session_key.length
 628                                     && (memcmp(zeros, user_session_key.data,
 629                                                user_session_key.length) != 0)) {
 630                                         hex_encode(user_session_key.data,
 631                                                    user_session_key.length,
 632                                                    &hex_user_session_key);
 633                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 634                                         SAFE_FREE(hex_user_session_key);
 635                                 }
 636                         }
 637                 }
 638                 /* clear out the state */
 639                 challenge = data_blob(NULL, 0);
 640                 nt_response = data_blob(NULL, 0);
 641                 lm_response = data_blob(NULL, 0);
 642                 SAFE_FREE(full_username);
 643                 SAFE_FREE(username);
 644                 SAFE_FREE(domain);
 645                 SAFE_FREE(plaintext_password);
 646                 ntlm_server_1_user_session_key = False;
 647                 ntlm_server_1_lm_session_key = False;
 648                 mux_printf(mux_id, ".\n");
 649
 650                 return;
 651         }
 652
 653         request = buf;
 654
 655         /* Indicates a base64 encoded structure */
 656         parameter = strstr(request, ":: ");
 657         if (!parameter) {
 658                 parameter = strstr(request, ": ");
 659
 660                 if (!parameter) {
 661                         DEBUG(0, ("Parameter not found!\n"));
 662                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 663                         return;
 664                 }
 665
 666                 parameter[0] ='\0';
 667                 parameter++;
 668                 parameter[0] ='\0';
 669                 parameter++;
 670
 671         } else {
 672                 parameter[0] ='\0';
 673                 parameter++;
 674                 parameter[0] ='\0';
 675                 parameter++;
 676                 parameter[0] ='\0';
 677                 parameter++;
 678
 679                 base64_decode_inplace(parameter);
 680         }
 681
 682         if (strequal(request, "LANMAN-Challenge")) {
 683                 challenge = strhex_to_data_blob(parameter);
 684                 if (challenge.length != 8) {
 685                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 686                                   parameter,
 687                                   (int)challenge.length);
 688                         challenge = data_blob(NULL, 0);
 689                 }
 690         } else if (strequal(request, "NT-Response")) {
 691                 nt_response = strhex_to_data_blob(parameter);
 692                 if (nt_response.length < 24) {
 693                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 694                                   parameter,
 695                                   (int)nt_response.length);
 696                         nt_response = data_blob(NULL, 0);
 697                 }
 698         } else if (strequal(request, "LANMAN-Response")) {
 699                 lm_response = strhex_to_data_blob(parameter);
 700                 if (lm_response.length != 24) {
 701                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 702                                   parameter,
 703                                   (int)lm_response.length);
 704                         lm_response = data_blob(NULL, 0);
 705                 }
 706         } else if (strequal(request, "Password")) {
 707                 plaintext_password = smb_xstrdup(parameter);
 708         } else if (strequal(request, "NT-Domain")) {
 709                 domain = smb_xstrdup(parameter);
 710         } else if (strequal(request, "Username")) {
 711                 username = smb_xstrdup(parameter);
 712         } else if (strequal(request, "Full-Username")) {
 713                 full_username = smb_xstrdup(parameter);
 714         } else if (strequal(request, "Request-User-Session-Key")) {
 715                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 716         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 717                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 718         } else {
 719                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 720         }
 721 }
 722
 723 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 724                                  stdio_helper_function fn)
 725 {
 726         char buf[SQUID_BUFFER_SIZE+1];
 727         unsigned int mux_id;
 728         int length;
 729         char *c;
 730         static BOOL err;
 731         struct mux_private {
 732                 unsigned int max_mux;
 733                 void **private_pointers;
 734         };
 735
 736         static struct mux_private *mux_private;
 737         static void *normal_private;
 738         void **private;
 739
 740         /* this is not a typo - x_fgets doesn't work too well under squid */
 741         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 742                 if (ferror(stdin)) {
 743                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 744                                   strerror(ferror(stdin))));
 745
 746                         exit(1);    /* BIIG buffer */
 747                 }
 748                 exit(0);
 749         }
 750
 751         c=memchr(buf,'\n',sizeof(buf)-1);
 752         if (c) {
 753                 *c = '\0';
 754                 length = c-buf;
 755         } else {
 756                 err = 1;
 757                 return;
 758         }
 759         if (err) {
 760                 DEBUG(0, ("Oversized message\n"));
 761                 x_fprintf(x_stdout, "ERR\n");
 762                 err = 0;
 763                 return;
 764         }
 765
 766         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 767
 768         if (buf[0] == '\0') {
 769                 DEBUG(0, ("Invalid Request (empty)\n"));
 770                 x_fprintf(x_stdout, "ERR\n");
 771                 return;
 772         }
 773
 774         if (opt_multiplex) {
 775                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 776                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 777                         x_fprintf(x_stdout, "ERR\n");
 778                         return;
 779                 }
 780                 if (!mux_private) {
 781                         mux_private = talloc_p(NULL, struct mux_private);
 782                         mux_private->max_mux = 0;
 783                         mux_private->private_pointers = NULL;
 784                 }
 785
 786                 c=memchr(buf,' ',sizeof(buf)-1);
 787                 c++;
 788                 if (mux_id >= mux_private->max_mux) {
 789                         unsigned int prev_max = mux_private->max_mux;
 790                         mux_private->max_mux = mux_id + 1;
 791                         mux_private->private_pointers
 792                                 = talloc_realloc_p(mux_private,
 793                                                    mux_private->private_pointers,
 794                                                    void *, mux_private->max_mux);
 795                         memset(&mux_private->private_pointers[prev_max], '\0',
 796                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 797                 };
 798
 799                 private = &mux_private->private_pointers[mux_id];
 800         } else {
 801                 c = buf;
 802                 private = &normal_private;
 803         }
 804
 805         fn(helper_mode, c, length, private, mux_id);
 806 }
 807
 808 static void squid_stream(enum stdio_helper_mode stdio_mode,
 809                          stdio_helper_function fn) {
 810         /* initialize FDescs */
 811         x_setbuf(x_stdout, NULL);
 812         x_setbuf(x_stderr, NULL);
 813         while(1) {
 814                 manage_squid_request(stdio_mode, fn);
 815         }
 816 }
 817
 818
 819 /* Main program */
 820
 821 enum {
 822         OPT_USERNAME = 1000,
 823         OPT_DOMAIN,
 824         OPT_WORKSTATION,
 825         OPT_CHALLENGE,
 826         OPT_RESPONSE,
 827         OPT_LM,
 828         OPT_NT,
 829         OPT_PASSWORD,
 830         OPT_LM_KEY,
 831         OPT_USER_SESSION_KEY,
 832         OPT_DIAGNOSTICS,
 833         OPT_REQUIRE_MEMBERSHIP,
 834         OPT_MULTIPLEX,
 835 };
 836
 837  int main(int argc, const char **argv)
 838 {
 839         static const char *helper_protocol;
 840         int opt;
 841
 842         poptContext pc;
 843
 844         /* NOTE: DO NOT change this interface without considering the implications!
 845            This is an external interface, which other programs will use to interact
 846            with this helper.
 847         */
 848
 849         /* We do not use single-letter command abbreviations, because they harm future
 850            interface stability. */
 851
 852         struct poptOption long_options[] = {
 853                 POPT_AUTOHELP
 854                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 855                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 856                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 857                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 858                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 859                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 860                 POPT_COMMON_SAMBA
 861                 POPT_TABLEEND
 862         };
 863
 864         /* Samba client initialisation */
 865
 866         setup_logging("ntlm_auth", DEBUG_STDERR);
 867
 868         if (!lp_load(dyn_CONFIGFILE, True, False, False)) {
 869                 d_fprintf(stderr, "wbinfo: error opening config file %s. Error was %s\n",
 870                         dyn_CONFIGFILE, strerror(errno));
 871                 exit(1);
 872         }
 873
 874         /* Parse options */
 875
 876         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 877
 878         /* Parse command line options */
 879
 880         if (argc == 1) {
 881                 poptPrintHelp(pc, stderr, 0);
 882                 return 1;
 883         }
 884
 885         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 886                             POPT_CONTEXT_KEEP_FIRST);
 887
 888         while((opt = poptGetNextOpt(pc)) != -1) {
 889                 if (opt < -1) {
 890                         break;
 891                 }
 892         }
 893         if (opt < -1) {
 894                 fprintf(stderr, "%s: %s\n",
 895                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 896                         poptStrerror(opt));
 897                 return 1;
 898         }
 899
 900         ntlm_auth_init_subsystems;
 901
 902
 903         if (opt_domain == NULL) {
 904                 opt_domain = lp_workgroup();
 905         }
 906
 907         if (helper_protocol) {
 908                 int i;
 909                 for (i=0; i<NUM_HELPER_MODES; i++) {
 910                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 911                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 912                                 exit(0);
 913                         }
 914                 }
 915                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 916
 917                 for (i=0; i<NUM_HELPER_MODES; i++) {
 918                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 919                 }
 920
 921                 exit(1);
 922         }
 923
 924         if (!opt_username) {
 925                 x_fprintf(x_stderr, "username must be specified!\n\n");
 926                 poptPrintHelp(pc, stderr, 0);
 927                 exit(1);
 928         }
 929
 930         if (opt_workstation == NULL) {
 931                 opt_workstation = lp_netbios_name();
 932         }
 933
 934         if (!opt_password) {
 935                 opt_password = getpass("password: ");
 936         }
 937
 938         {
 939                 char *user;
 940
 941                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
 942                 if (!check_plaintext_auth(user, opt_password, True)) {
 943                         return 1;
 944                 }
 945         }
 946
 947         /* Exit code */
 948
 949         poptFreeContext(pc);
 950         return 0;
 951 }