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 "system/filesys.h"
  27 #include "lib/cmdline/popt_common.h"
  28 #include "auth/auth.h"
  29 #include "pstring.h"
  30 #include "libcli/auth/libcli_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                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 171                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 172                                                 challenge,
 173                                                 lm_response,
 174                                                 nt_response,
 175                                                 username,
 176                                                 username,
 177                                                 domain,
 178                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 179
 180                 if (NT_STATUS_IS_OK(nt_status)) {
 181                         if (unix_name) {
 182                                 asprintf(unix_name,
 183                                          "%s%c%s", domain,
 184                                          *lp_winbind_separator(),
 185                                          username);
 186                         }
 187                 } else {
 188                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 189                                   domain, username, workstation,
 190                                   nt_errstr(nt_status)));
 191                 }
 192                 talloc_free(mem_ctx);
 193         }
 194         if (error_string) {
 195                 *error_string = strdup(nt_errstr(nt_status));
 196         }
 197         return nt_status;
 198
 199
 200 }
 201
 202 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 203                                        char *buf, int length, void **private,
 204                                        unsigned int mux_id, void **private2)
 205 {
 206         char *user, *pass;
 207         user=buf;
 208
 209         pass=memchr(buf,' ',length);
 210         if (!pass) {
 211                 DEBUG(2, ("Password not found. Denying access\n"));
 212                 mux_printf(mux_id, "ERR\n");
 213                 return;
 214         }
 215         *pass='\0';
 216         pass++;
 217
 218         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 219                 rfc1738_unescape(user);
 220                 rfc1738_unescape(pass);
 221         }
 222
 223         if (check_plaintext_auth(user, pass, False)) {
 224                 mux_printf(mux_id, "OK\n");
 225         } else {
 226                 mux_printf(mux_id, "ERR\n");
 227         }
 228 }
 229
 230 /* This is a bit hairy, but the basic idea is to do a password callback
 231    to the calling application.  The callback comes from within gensec */
 232
 233 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 234                                          char *buf, int length, void **private,
 235                                          unsigned int mux_id, void **password)
 236 {
 237         DATA_BLOB in;
 238         if (strlen(buf) < 2) {
 239                 DEBUG(1, ("query [%s] invalid", buf));
 240                 mux_printf(mux_id, "BH\n");
 241                 return;
 242         }
 243
 244         if (strlen(buf) > 3) {
 245                 in = base64_decode_data_blob(NULL, buf + 3);
 246         } else {
 247                 in = data_blob(NULL, 0);
 248         }
 249
 250         if (strncmp(buf, "PW ", 3) == 0) {
 251
 252                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 253                                            (const char *)in.data, in.length);
 254
 255                 if (*password == NULL) {
 256                         DEBUG(1, ("Out of memory\n"));
 257                         mux_printf(mux_id, "BH\n");
 258                         data_blob_free(&in);
 259                         return;
 260                 }
 261
 262                 mux_printf(mux_id, "OK\n");
 263                 data_blob_free(&in);
 264                 return;
 265         }
 266         DEBUG(1, ("Asked for (and expected) a password\n"));
 267         mux_printf(mux_id, "BH\n");
 268         data_blob_free(&in);
 269 }
 270
 271 /**
 272  * Callback for password credentails.  This is not async, and when
 273  * GENSEC and the credentails code is made async, it will look rather
 274  * different.
 275  */
 276
 277 static const char *get_password(struct cli_credentials *credentials)
 278 {
 279         char *password = NULL;
 280
 281         /* Ask for a password */
 282         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 283         credentials->priv_data = NULL;
 284
 285         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 286         return password;
 287 }
 288
 289 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 290                                   char *buf, int length, void **private,
 291                                   unsigned int mux_id, void **private2)
 292 {
 293         DATA_BLOB in;
 294         DATA_BLOB out = data_blob(NULL, 0);
 295         char *out_base64 = NULL;
 296         const char *reply_arg = NULL;
 297         struct gensec_ntlm_state {
 298                 struct gensec_security *gensec_state;
 299                 const char *set_password;
 300         };
 301         struct gensec_ntlm_state *state;
 302
 303         NTSTATUS nt_status;
 304         BOOL first = False;
 305         const char *reply_code;
 306         struct cli_credentials *creds;
 307
 308         TALLOC_CTX *mem_ctx;
 309
 310         if (*private) {
 311                 state = *private;
 312         } else {
 313                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 314                 if (!state) {
 315                         mux_printf(mux_id, "BH No Memory\n");
 316                         exit(1);
 317                 }
 318                 *private = state;
 319                 if (opt_password) {
 320                         state->set_password = opt_password;
 321                 }
 322         }
 323
 324         if (strlen(buf) < 2) {
 325                 DEBUG(1, ("query [%s] invalid", buf));
 326                 mux_printf(mux_id, "BH\n");
 327                 return;
 328         }
 329
 330         if (strlen(buf) > 3) {
 331                 in = base64_decode_data_blob(NULL, buf + 3);
 332         } else {
 333                 in = data_blob(NULL, 0);
 334         }
 335
 336         if (strncmp(buf, "YR", 2) == 0) {
 337                 if (state->gensec_state) {
 338                         talloc_free(state->gensec_state);
 339                         state->gensec_state = NULL;
 340                 }
 341         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 342                 /* do nothing */
 343                 data_blob_free(&in);
 344                 return;
 345         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 346                     (strncmp(buf, "KK ", 3) != 0) &&
 347                     (strncmp(buf, "AF ", 3) != 0) &&
 348                     (strncmp(buf, "NA ", 3) != 0) &&
 349                     (strncmp(buf, "UG", 2) != 0) &&
 350                     (strncmp(buf, "PW ", 3) != 0)) {
 351                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 352                 mux_printf(mux_id, "BH\n");
 353                 data_blob_free(&in);
 354                 return;
 355         }
 356
 357         /* setup gensec */
 358         if (!(state->gensec_state)) {
 359                 switch (stdio_helper_mode) {
 360                 case GSS_SPNEGO_CLIENT:
 361                 case NTLMSSP_CLIENT_1:
 362                         /* setup the client side */
 363
 364                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 365                         if (!NT_STATUS_IS_OK(nt_status)) {
 366                                 exit(1);
 367                         }
 368
 369                         break;
 370                 case GSS_SPNEGO_SERVER:
 371                 case SQUID_2_5_NTLMSSP:
 372                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, &state->gensec_state, NULL))) {
 373                                 exit(1);
 374                         }
 375                         break;
 376                 default:
 377                         abort();
 378                 }
 379
 380                 creds = cli_credentials_init(state->gensec_state);
 381                 cli_credentials_set_conf(creds);
 382                 if (opt_username) {
 383                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 384                 }
 385                 if (opt_domain) {
 386                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 387                 }
 388                 if (state->set_password) {
 389                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 390                 } else {
 391                         cli_credentials_set_password_callback(creds, get_password);
 392                         creds->priv_data = (void*)mux_id;
 393                 }
 394                 if (opt_workstation) {
 395                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 396                 }
 397
 398                 switch (stdio_helper_mode) {
 399                 case GSS_SPNEGO_SERVER:
 400                 case SQUID_2_5_NTLMSSP:
 401                         cli_credentials_set_machine_account(creds);
 402                         break;
 403                 default:
 404                         break;
 405                 }
 406
 407                 gensec_set_credentials(state->gensec_state, creds);
 408
 409                 switch (stdio_helper_mode) {
 410                 case GSS_SPNEGO_CLIENT:
 411                 case GSS_SPNEGO_SERVER:
 412                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 413                         if (!in.length) {
 414                                 first = True;
 415                         }
 416                         break;
 417                 case NTLMSSP_CLIENT_1:
 418                         if (!in.length) {
 419                                 first = True;
 420                         }
 421                 case SQUID_2_5_NTLMSSP:
 422                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 423                         break;
 424                 default:
 425                         abort();
 426                 }
 427
 428                 if (!NT_STATUS_IS_OK(nt_status)) {
 429                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 430                         mux_printf(mux_id, "BH\n");
 431                         return;
 432                 }
 433
 434         }
 435
 436         /* update */
 437         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 438
 439         if (strncmp(buf, "PW ", 3) == 0) {
 440                 state->set_password = talloc_strndup(state,
 441                                                      (const char *)in.data,
 442                                                      in.length);
 443
 444                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 445                                              state->set_password,
 446                                              CRED_SPECIFIED);
 447                 mux_printf(mux_id, "OK\n");
 448                 data_blob_free(&in);
 449                 talloc_free(mem_ctx);
 450                 return;
 451         }
 452
 453         if (strncmp(buf, "UG", 2) == 0) {
 454                 int i;
 455                 char *grouplist = NULL;
 456                 struct auth_session_info *session_info;
 457
 458                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 459                 if (!NT_STATUS_IS_OK(nt_status)) {
 460                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 461                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 462                         data_blob_free(&in);
 463                         talloc_free(mem_ctx);
 464                         return;
 465                 }
 466
 467                 /* get the string onto the context */
 468                 grouplist = talloc_strdup(mem_ctx, "");
 469
 470                 for (i=0; i<session_info->security_token->num_sids; i++) {
 471                         struct security_token *token = session_info->security_token;
 472                         const char *sidstr = dom_sid_string(session_info,
 473                                                             token->sids[i]);
 474                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 475                 }
 476
 477                 mux_printf(mux_id, "GL %s\n", grouplist);
 478                 talloc_free(session_info);
 479                 data_blob_free(&in);
 480                 talloc_free(mem_ctx);
 481                 return;
 482         }
 483
 484         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 485
 486         /* don't leak 'bad password'/'no such user' info to the network client */
 487         nt_status = auth_nt_status_squash(nt_status);
 488
 489         if (out.length) {
 490                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 491         } else {
 492                 out_base64 = NULL;
 493         }
 494
 495         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 496                 reply_arg = "*";
 497                 if (first) {
 498                         reply_code = "YR";
 499                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 500                         reply_code = "KK";
 501                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 502                         reply_code = "TT";
 503                 } else {
 504                         abort();
 505                 }
 506
 507
 508         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 509                 reply_code = "BH";
 510                 reply_arg = nt_errstr(nt_status);
 511                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 512         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 513                 reply_code = "BH";
 514                 reply_arg = nt_errstr(nt_status);
 515                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 516         } else if (!NT_STATUS_IS_OK(nt_status)) {
 517                 reply_code = "NA";
 518                 reply_arg = nt_errstr(nt_status);
 519                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 520         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 521                 struct auth_session_info *session_info;
 522
 523                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 524                 if (!NT_STATUS_IS_OK(nt_status)) {
 525                         reply_code = "BH";
 526                         reply_arg = nt_errstr(nt_status);
 527                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 528                 } else {
 529
 530                         reply_code = "AF";
 531                         reply_arg = talloc_asprintf(state->gensec_state,
 532                                                     "%s%s%s", session_info->server_info->domain_name,
 533                                                     lp_winbind_separator(), session_info->server_info->account_name);
 534                         talloc_free(session_info);
 535                 }
 536         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 537                 reply_code = "AF";
 538                 reply_arg = out_base64;
 539         } else {
 540                 abort();
 541         }
 542
 543         switch (stdio_helper_mode) {
 544         case GSS_SPNEGO_SERVER:
 545                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 546                           out_base64 ? out_base64 : "*",
 547                           reply_arg ? reply_arg : "*");
 548                 break;
 549         default:
 550                 if (out_base64) {
 551                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 552                 } else if (reply_arg) {
 553                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 554                 } else {
 555                         mux_printf(mux_id, "%s\n", reply_code);
 556                 }
 557         }
 558
 559         talloc_free(mem_ctx);
 560         return;
 561 }
 562
 563 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 564                                          char *buf, int length, void **private,
 565                                          unsigned int mux_id, void **private2)
 566 {
 567         char *request, *parameter;
 568         static DATA_BLOB challenge;
 569         static DATA_BLOB lm_response;
 570         static DATA_BLOB nt_response;
 571         static char *full_username;
 572         static char *username;
 573         static char *domain;
 574         static char *plaintext_password;
 575         static BOOL ntlm_server_1_user_session_key;
 576         static BOOL ntlm_server_1_lm_session_key;
 577
 578         if (strequal(buf, ".")) {
 579                 if (!full_username && !username) {
 580                         mux_printf(mux_id, "Error: No username supplied!\n");
 581                 } else if (plaintext_password) {
 582                         /* handle this request as plaintext */
 583                         if (!full_username) {
 584                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 585                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 586                                         return;
 587                                 }
 588                         }
 589                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 590                                 mux_printf(mux_id, "Authenticated: Yes\n");
 591                         } else {
 592                                 mux_printf(mux_id, "Authenticated: No\n");
 593                         }
 594                 } else if (!lm_response.data && !nt_response.data) {
 595                         mux_printf(mux_id, "Error: No password supplied!\n");
 596                 } else if (!challenge.data) {
 597                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 598                 } else {
 599                         char *error_string = NULL;
 600                         DATA_BLOB lm_key;
 601                         DATA_BLOB user_session_key;
 602                         uint32_t flags = 0;
 603
 604                         if (full_username && !username) {
 605                                 fstring fstr_user;
 606                                 fstring fstr_domain;
 607
 608                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 609                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 610                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 611                                 }
 612                                 SAFE_FREE(username);
 613                                 SAFE_FREE(domain);
 614                                 username = smb_xstrdup(fstr_user);
 615                                 domain = smb_xstrdup(fstr_domain);
 616                         }
 617
 618                         if (!domain) {
 619                                 domain = smb_xstrdup(lp_workgroup());
 620                         }
 621
 622                         if (ntlm_server_1_lm_session_key)
 623                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 624
 625                         if (ntlm_server_1_user_session_key)
 626                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 627
 628                         if (!NT_STATUS_IS_OK(
 629                                     local_pw_check_specified(username,
 630                                                               domain,
 631                                                               lp_netbios_name(),
 632                                                               &challenge,
 633                                                               &lm_response,
 634                                                               &nt_response,
 635                                                               flags,
 636                                                               &lm_key,
 637                                                               &user_session_key,
 638                                                               &error_string,
 639                                                               NULL))) {
 640
 641                                 mux_printf(mux_id, "Authenticated: No\n");
 642                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 643                                 SAFE_FREE(error_string);
 644                         } else {
 645                                 static char zeros[16];
 646                                 char *hex_lm_key;
 647                                 char *hex_user_session_key;
 648
 649                                 mux_printf(mux_id, "Authenticated: Yes\n");
 650
 651                                 if (ntlm_server_1_lm_session_key
 652                                     && lm_key.length
 653                                     && (memcmp(zeros, lm_key.data,
 654                                                                 lm_key.length) != 0)) {
 655                                         hex_encode(lm_key.data,
 656                                                    lm_key.length,
 657                                                    &hex_lm_key);
 658                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 659                                         SAFE_FREE(hex_lm_key);
 660                                 }
 661
 662                                 if (ntlm_server_1_user_session_key
 663                                     && user_session_key.length
 664                                     && (memcmp(zeros, user_session_key.data,
 665                                                user_session_key.length) != 0)) {
 666                                         hex_encode(user_session_key.data,
 667                                                    user_session_key.length,
 668                                                    &hex_user_session_key);
 669                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 670                                         SAFE_FREE(hex_user_session_key);
 671                                 }
 672                         }
 673                 }
 674                 /* clear out the state */
 675                 challenge = data_blob(NULL, 0);
 676                 nt_response = data_blob(NULL, 0);
 677                 lm_response = data_blob(NULL, 0);
 678                 SAFE_FREE(full_username);
 679                 SAFE_FREE(username);
 680                 SAFE_FREE(domain);
 681                 SAFE_FREE(plaintext_password);
 682                 ntlm_server_1_user_session_key = False;
 683                 ntlm_server_1_lm_session_key = False;
 684                 mux_printf(mux_id, ".\n");
 685
 686                 return;
 687         }
 688
 689         request = buf;
 690
 691         /* Indicates a base64 encoded structure */
 692         parameter = strstr(request, ":: ");
 693         if (!parameter) {
 694                 parameter = strstr(request, ": ");
 695
 696                 if (!parameter) {
 697                         DEBUG(0, ("Parameter not found!\n"));
 698                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 699                         return;
 700                 }
 701
 702                 parameter[0] ='\0';
 703                 parameter++;
 704                 parameter[0] ='\0';
 705                 parameter++;
 706
 707         } else {
 708                 parameter[0] ='\0';
 709                 parameter++;
 710                 parameter[0] ='\0';
 711                 parameter++;
 712                 parameter[0] ='\0';
 713                 parameter++;
 714
 715                 base64_decode_inplace(parameter);
 716         }
 717
 718         if (strequal(request, "LANMAN-Challenge")) {
 719                 challenge = strhex_to_data_blob(parameter);
 720                 if (challenge.length != 8) {
 721                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 722                                   parameter,
 723                                   (int)challenge.length);
 724                         challenge = data_blob(NULL, 0);
 725                 }
 726         } else if (strequal(request, "NT-Response")) {
 727                 nt_response = strhex_to_data_blob(parameter);
 728                 if (nt_response.length < 24) {
 729                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 730                                   parameter,
 731                                   (int)nt_response.length);
 732                         nt_response = data_blob(NULL, 0);
 733                 }
 734         } else if (strequal(request, "LANMAN-Response")) {
 735                 lm_response = strhex_to_data_blob(parameter);
 736                 if (lm_response.length != 24) {
 737                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 738                                   parameter,
 739                                   (int)lm_response.length);
 740                         lm_response = data_blob(NULL, 0);
 741                 }
 742         } else if (strequal(request, "Password")) {
 743                 plaintext_password = smb_xstrdup(parameter);
 744         } else if (strequal(request, "NT-Domain")) {
 745                 domain = smb_xstrdup(parameter);
 746         } else if (strequal(request, "Username")) {
 747                 username = smb_xstrdup(parameter);
 748         } else if (strequal(request, "Full-Username")) {
 749                 full_username = smb_xstrdup(parameter);
 750         } else if (strequal(request, "Request-User-Session-Key")) {
 751                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 752         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 753                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 754         } else {
 755                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 756         }
 757 }
 758
 759 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 760                                  stdio_helper_function fn, void **private2)
 761 {
 762         char buf[SQUID_BUFFER_SIZE+1];
 763         unsigned int mux_id = 0;
 764         int length;
 765         char *c;
 766         static BOOL err;
 767         struct mux_private {
 768                 unsigned int max_mux;
 769                 void **private_pointers;
 770         };
 771
 772         static struct mux_private *mux_private;
 773         static void *normal_private;
 774         void **private;
 775
 776         /* this is not a typo - x_fgets doesn't work too well under squid */
 777         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 778                 if (ferror(stdin)) {
 779                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 780                                   strerror(ferror(stdin))));
 781
 782                         exit(1);    /* BIIG buffer */
 783                 }
 784                 exit(0);
 785         }
 786
 787         c=memchr(buf,'\n',sizeof(buf)-1);
 788         if (c) {
 789                 *c = '\0';
 790                 length = c-buf;
 791         } else {
 792                 err = 1;
 793                 return;
 794         }
 795         if (err) {
 796                 DEBUG(0, ("Oversized message\n"));
 797                 x_fprintf(x_stdout, "ERR\n");
 798                 err = 0;
 799                 return;
 800         }
 801
 802         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 803
 804         if (buf[0] == '\0') {
 805                 DEBUG(0, ("Invalid Request (empty)\n"));
 806                 x_fprintf(x_stdout, "ERR\n");
 807                 return;
 808         }
 809
 810         if (opt_multiplex) {
 811                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 812                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 813                         x_fprintf(x_stdout, "ERR\n");
 814                         return;
 815                 }
 816                 if (!mux_private) {
 817                         mux_private = talloc(NULL, struct mux_private);
 818                         mux_private->max_mux = 0;
 819                         mux_private->private_pointers = NULL;
 820                 }
 821
 822                 c=strchr(buf,' ');
 823                 if (!c) {
 824                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 825                         x_fprintf(x_stdout, "ERR\n");
 826                         return;
 827                 }
 828                 c++;
 829                 if (mux_id >= mux_private->max_mux) {
 830                         unsigned int prev_max = mux_private->max_mux;
 831                         mux_private->max_mux = mux_id + 1;
 832                         mux_private->private_pointers
 833                                 = talloc_realloc(mux_private,
 834                                                    mux_private->private_pointers,
 835                                                    void *, mux_private->max_mux);
 836                         memset(&mux_private->private_pointers[prev_max], '\0',
 837                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 838                 };
 839
 840                 private = &mux_private->private_pointers[mux_id];
 841         } else {
 842                 c = buf;
 843                 private = &normal_private;
 844         }
 845
 846         fn(helper_mode, c, length, private, mux_id, private2);
 847 }
 848
 849 static void squid_stream(enum stdio_helper_mode stdio_mode,
 850                          stdio_helper_function fn) {
 851         /* initialize FDescs */
 852         x_setbuf(x_stdout, NULL);
 853         x_setbuf(x_stderr, NULL);
 854         while(1) {
 855                 manage_squid_request(stdio_mode, fn, NULL);
 856         }
 857 }
 858
 859
 860 /* Main program */
 861
 862 enum {
 863         OPT_USERNAME = 1000,
 864         OPT_DOMAIN,
 865         OPT_WORKSTATION,
 866         OPT_CHALLENGE,
 867         OPT_RESPONSE,
 868         OPT_LM,
 869         OPT_NT,
 870         OPT_PASSWORD,
 871         OPT_LM_KEY,
 872         OPT_USER_SESSION_KEY,
 873         OPT_DIAGNOSTICS,
 874         OPT_REQUIRE_MEMBERSHIP,
 875         OPT_MULTIPLEX,
 876 };
 877
 878 int main(int argc, const char **argv)
 879 {
 880         static const char *helper_protocol;
 881         int opt;
 882
 883         poptContext pc;
 884
 885         /* NOTE: DO NOT change this interface without considering the implications!
 886            This is an external interface, which other programs will use to interact
 887            with this helper.
 888         */
 889
 890         /* We do not use single-letter command abbreviations, because they harm future
 891            interface stability. */
 892
 893         struct poptOption long_options[] = {
 894                 POPT_AUTOHELP
 895                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 896                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 897                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 898                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 899                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 900                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 901                 POPT_COMMON_SAMBA
 902                 POPT_COMMON_VERSION
 903                 POPT_TABLEEND
 904         };
 905
 906         /* Samba client initialisation */
 907
 908         setup_logging(NULL, DEBUG_STDERR);
 909
 910         /* Parse options */
 911
 912         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 913
 914         /* Parse command line options */
 915
 916         if (argc == 1) {
 917                 poptPrintHelp(pc, stderr, 0);
 918                 return 1;
 919         }
 920
 921         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 922                             POPT_CONTEXT_KEEP_FIRST);
 923
 924         while((opt = poptGetNextOpt(pc)) != -1) {
 925                 if (opt < -1) {
 926                         break;
 927                 }
 928         }
 929         if (opt < -1) {
 930                 fprintf(stderr, "%s: %s\n",
 931                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 932                         poptStrerror(opt));
 933                 return 1;
 934         }
 935
 936         gensec_init();
 937
 938         if (opt_domain == NULL) {
 939                 opt_domain = lp_workgroup();
 940         }
 941
 942         if (helper_protocol) {
 943                 int i;
 944                 for (i=0; i<NUM_HELPER_MODES; i++) {
 945                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 946                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 947                                 exit(0);
 948                         }
 949                 }
 950                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 951
 952                 for (i=0; i<NUM_HELPER_MODES; i++) {
 953                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 954                 }
 955
 956                 exit(1);
 957         }
 958
 959         if (!opt_username) {
 960                 x_fprintf(x_stderr, "username must be specified!\n\n");
 961                 poptPrintHelp(pc, stderr, 0);
 962                 exit(1);
 963         }
 964
 965         if (opt_workstation == NULL) {
 966                 opt_workstation = lp_netbios_name();
 967         }
 968
 969         if (!opt_password) {
 970                 opt_password = getpass("password: ");
 971         }
 972
 973         {
 974                 char *user;
 975
 976                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
 977                 if (!check_plaintext_auth(user, opt_password, True)) {
 978                         return 1;
 979                 }
 980         }
 981
 982         /* Exit code */
 983
 984         poptFreeContext(pc);
 985         return 0;
 986 }