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 "libcli/security/security.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_WINBIND
  35
  36 #define SQUID_BUFFER_SIZE 2010
  37
  38 enum stdio_helper_mode {
  39         SQUID_2_4_BASIC,
  40         SQUID_2_5_BASIC,
  41         SQUID_2_5_NTLMSSP,
  42         NTLMSSP_CLIENT_1,
  43         GSS_SPNEGO_CLIENT,
  44         GSS_SPNEGO_SERVER,
  45         NTLM_SERVER_1,
  46         NUM_HELPER_MODES
  47 };
  48
  49 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  50 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  51
  52
  53 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  54                                       char *buf, int length, void **private,
  55                                       unsigned int mux_id, void **private2);
  56
  57 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  58                                         char *buf, int length, void **private,
  59                                         unsigned int mux_id, void **private2);
  60
  61 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  62                                    char *buf, int length, void **private,
  63                                    unsigned int mux_id, void **private2);
  64
  65 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  66                                           char *buf, int length, void **private,
  67                                           unsigned int mux_id, void **private2);
  68
  69 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  70                                  stdio_helper_function fn, void **private2);
  71
  72 static const struct {
  73         enum stdio_helper_mode mode;
  74         const char *name;
  75         stdio_helper_function fn;
  76 } stdio_helper_protocols[] = {
  77         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  78         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  79         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  80         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  81         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  82         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  83         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  84         { NUM_HELPER_MODES, NULL, NULL}
  85 };
  86
  87 extern int winbindd_fd;
  88
  89 static const char *opt_username;
  90 static const char *opt_domain;
  91 static const char *opt_workstation;
  92 static const char *opt_password;
  93 static int opt_multiplex;
  94
  95
  96 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
  97
  98 static void mux_printf(unsigned int mux_id, const char *format, ...)
  99 {
 100         va_list ap;
 101
 102         if (opt_multiplex) {
 103                 x_fprintf(x_stdout, "%d ", mux_id);
 104         }
 105
 106         va_start(ap, format);
 107         x_vfprintf(x_stdout, format, ap);
 108         va_end(ap);
 109 }
 110
 111
 112
 113 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 114    form DOMAIN/user into a domain and a user */
 115
 116 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 117                                         fstring user)
 118 {
 119
 120         char *p = strchr(domuser,*lp_winbind_separator());
 121
 122         if (!p) {
 123                 return False;
 124         }
 125
 126         fstrcpy(user, p+1);
 127         fstrcpy(domain, domuser);
 128         domain[PTR_DIFF(p, domuser)] = 0;
 129
 130         return True;
 131 }
 132
 133 /* Authenticate a user with a plaintext password */
 134
 135 static BOOL check_plaintext_auth(const char *user, const char *pass,
 136                                  BOOL stdout_diagnostics)
 137 {
 138         return (strcmp(pass, opt_password) == 0);
 139 }
 140
 141 /* authenticate a user with an encrypted username/password */
 142
 143 static NTSTATUS local_pw_check_specified(const char *username,
 144                                          const char *domain,
 145                                          const char *workstation,
 146                                          const DATA_BLOB *challenge,
 147                                          const DATA_BLOB *lm_response,
 148                                          const DATA_BLOB *nt_response,
 149                                          uint32_t flags,
 150                                          DATA_BLOB *lm_session_key,
 151                                          DATA_BLOB *user_session_key,
 152                                          char **error_string,
 153                                          char **unix_name)
 154 {
 155         NTSTATUS nt_status;
 156         uint8_t lm_pw[16], nt_pw[16];
 157         uint8_t *lm_pwd, *nt_pwd;
 158         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 159         if (!mem_ctx) {
 160                 nt_status = NT_STATUS_NO_MEMORY;
 161         } else {
 162
 163                 E_md4hash(opt_password, nt_pw);
 164                 if (E_deshash(opt_password, lm_pw)) {
 165                         lm_pwd = lm_pw;
 166                 } else {
 167                         lm_pwd = NULL;
 168                 }
 169                 nt_pwd = nt_pw;
 170
 171
 172                 nt_status = ntlm_password_check(mem_ctx,
 173                                                 challenge,
 174                                                 lm_response,
 175                                                 nt_response,
 176                                                 NULL, NULL,
 177                                                 username,
 178                                                 username,
 179                                                 domain,
 180                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 181
 182                 if (NT_STATUS_IS_OK(nt_status)) {
 183                         if (unix_name) {
 184                                 asprintf(unix_name,
 185                                          "%s%c%s", domain,
 186                                          *lp_winbind_separator(),
 187                                          username);
 188                         }
 189                 } else {
 190                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 191                                   domain, username, workstation,
 192                                   nt_errstr(nt_status)));
 193                 }
 194                 talloc_free(mem_ctx);
 195         }
 196         if (error_string) {
 197                 *error_string = strdup(nt_errstr(nt_status));
 198         }
 199         return nt_status;
 200
 201
 202 }
 203
 204 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 205                                        char *buf, int length, void **private,
 206                                        unsigned int mux_id, void **private2)
 207 {
 208         char *user, *pass;
 209         user=buf;
 210
 211         pass=memchr(buf,' ',length);
 212         if (!pass) {
 213                 DEBUG(2, ("Password not found. Denying access\n"));
 214                 mux_printf(mux_id, "ERR\n");
 215                 return;
 216         }
 217         *pass='\0';
 218         pass++;
 219
 220         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 221                 rfc1738_unescape(user);
 222                 rfc1738_unescape(pass);
 223         }
 224
 225         if (check_plaintext_auth(user, pass, False)) {
 226                 mux_printf(mux_id, "OK\n");
 227         } else {
 228                 mux_printf(mux_id, "ERR\n");
 229         }
 230 }
 231
 232 /* This is a bit hairy, but the basic idea is to do a password callback
 233    to the calling application.  The callback comes from within gensec */
 234
 235 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 236                                          char *buf, int length, void **private,
 237                                          unsigned int mux_id, void **password)
 238 {
 239         DATA_BLOB in;
 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                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 255                                            (const char *)in.data, in.length);
 256
 257                 if (*password == 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 password credentails.  This is not async, and when
 275  * GENSEC and the credentails code is made async, it will look rather
 276  * different.
 277  */
 278
 279 static const char *get_password(struct cli_credentials *credentials)
 280 {
 281         char *password = NULL;
 282
 283         /* Ask for a password */
 284         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 285         credentials->priv_data = NULL;
 286
 287         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 288         return password;
 289 }
 290
 291 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 292                                   char *buf, int length, void **private,
 293                                   unsigned int mux_id, void **private2)
 294 {
 295         DATA_BLOB in;
 296         DATA_BLOB out = data_blob(NULL, 0);
 297         char *out_base64 = NULL;
 298         const char *reply_arg = NULL;
 299         struct gensec_security **gensec_state = (struct gensec_security **)private;
 300         NTSTATUS nt_status;
 301         BOOL first = False;
 302         const char *reply_code;
 303         struct cli_credentials *creds;
 304
 305         if (strlen(buf) < 2) {
 306                 DEBUG(1, ("query [%s] invalid", buf));
 307                 mux_printf(mux_id, "BH\n");
 308                 return;
 309         }
 310
 311         if (strlen(buf) > 3) {
 312                 in = base64_decode_data_blob(buf + 3);
 313         } else {
 314                 in = data_blob(NULL, 0);
 315         }
 316
 317         if (strncmp(buf, "YR", 2) == 0) {
 318                 if (gensec_state && *gensec_state) {
 319                         talloc_free(*gensec_state);
 320                         *gensec_state = NULL;
 321                 }
 322         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 323                 /* do nothing */
 324                 data_blob_free(&in);
 325                 return;
 326         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 327                     (strncmp(buf, "KK ", 3) != 0) &&
 328                     (strncmp(buf, "AF ", 3) != 0) &&
 329                     (strncmp(buf, "NA ", 3) != 0) &&
 330                     (strncmp(buf, "UG", 2) != 0) &&
 331                     (strncmp(buf, "PW ", 3) != 0)) {
 332                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 333                 mux_printf(mux_id, "BH\n");
 334                 data_blob_free(&in);
 335                 return;
 336         }
 337
 338         /* setup gensec */
 339         if (!(gensec_state && *gensec_state)) {
 340                 switch (stdio_helper_mode) {
 341                 case GSS_SPNEGO_CLIENT:
 342                 case NTLMSSP_CLIENT_1:
 343                         /* setup the client side */
 344
 345                         if (!NT_STATUS_IS_OK(gensec_client_start(NULL, gensec_state))) {
 346                                 exit(1);
 347                         }
 348
 349                         creds = cli_credentials_init(*gensec_state);
 350                         cli_credentials_set_conf(creds);
 351                         if (opt_username) {
 352                                 cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 353                         }
 354                         if (opt_domain) {
 355                                 cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 356                         }
 357                         if (opt_password) {
 358                                 cli_credentials_set_password(creds, opt_password, CRED_SPECIFIED);
 359                         } else {
 360                                 creds->password_obtained = CRED_CALLBACK;
 361                                 creds->password_cb = get_password;
 362                                 creds->priv_data = (void*)mux_id;
 363                         }
 364
 365                         gensec_set_credentials(*gensec_state, creds);
 366
 367                         break;
 368                 case GSS_SPNEGO_SERVER:
 369                 case SQUID_2_5_NTLMSSP:
 370                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, gensec_state))) {
 371                                 exit(1);
 372                         }
 373                         break;
 374                 default:
 375                         abort();
 376                 }
 377
 378                 switch (stdio_helper_mode) {
 379                 case GSS_SPNEGO_CLIENT:
 380                 case GSS_SPNEGO_SERVER:
 381                         nt_status = gensec_start_mech_by_oid(*gensec_state, GENSEC_OID_SPNEGO);
 382                         if (!in.length) {
 383                                 first = True;
 384                         }
 385                         break;
 386                 case NTLMSSP_CLIENT_1:
 387                         if (!in.length) {
 388                                 first = True;
 389                         }
 390                 case SQUID_2_5_NTLMSSP:
 391                         nt_status = gensec_start_mech_by_oid(*gensec_state, GENSEC_OID_NTLMSSP);
 392                         break;
 393                 default:
 394                         abort();
 395                 }
 396
 397                 if (!NT_STATUS_IS_OK(nt_status)) {
 398                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 399                         mux_printf(mux_id, "BH\n");
 400                         return;
 401                 }
 402         }
 403
 404         if (strncmp(buf, "PW ", 3) == 0) {
 405
 406                 cli_credentials_set_password((*gensec_state)->credentials,
 407                                              talloc_strndup((*gensec_state),
 408                                                             (const char *)in.data,
 409                                                             in.length),
 410                                              CRED_SPECIFIED);
 411                 mux_printf(mux_id, "OK\n");
 412                 data_blob_free(&in);
 413                 return;
 414         }
 415
 416         if (strncmp(buf, "UG", 2) == 0) {
 417                 int i;
 418                 char *grouplist = NULL;
 419                 struct auth_session_info *session_info;
 420
 421                 if (!NT_STATUS_IS_OK(gensec_session_info(*gensec_state, &session_info))) {
 422                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 423                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 424                         data_blob_free(&in);
 425                         return;
 426                 }
 427
 428                 /* get the string onto the context */
 429                 grouplist = talloc_strdup(session_info, "");
 430
 431                 for (i=0; i<session_info->security_token->num_sids; i++) {
 432                         struct security_token *token = session_info->security_token;
 433                         const char *sidstr = dom_sid_string(session_info,
 434                                                             token->sids[i]);
 435                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 436                 }
 437
 438                 mux_printf(mux_id, "GL %s\n", grouplist);
 439                 talloc_free(session_info);
 440                 data_blob_free(&in);
 441                 return;
 442         }
 443
 444         /* update */
 445
 446         nt_status = gensec_update(*gensec_state, NULL, in, &out);
 447
 448         /* don't leak 'bad password'/'no such user' info to the network client */
 449         nt_status = auth_nt_status_squash(nt_status);
 450
 451         if (out.length) {
 452                 out_base64 = base64_encode_data_blob(out);
 453         } else {
 454                 out_base64 = NULL;
 455         }
 456         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 457                 reply_arg = "*";
 458                 if (first) {
 459                         reply_code = "YR";
 460                 } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 461                         reply_code = "KK";
 462                 } else if ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 463                         reply_code = "TT";
 464                 } else {
 465                         abort();
 466                 }
 467
 468
 469         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 470                 reply_code = "BH";
 471                 reply_arg = nt_errstr(nt_status);
 472                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 473         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 474                 reply_code = "BH";
 475                 reply_arg = nt_errstr(nt_status);
 476                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 477         } else if (!NT_STATUS_IS_OK(nt_status)) {
 478                 reply_code = "NA";
 479                 reply_arg = nt_errstr(nt_status);
 480                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 481         } else if /* OK */ ((*gensec_state)->gensec_role == GENSEC_SERVER) {
 482                 struct auth_session_info *session_info;
 483
 484                 nt_status = gensec_session_info(*gensec_state, &session_info);
 485                 if (!NT_STATUS_IS_OK(nt_status)) {
 486                         reply_code = "BH";
 487                         reply_arg = nt_errstr(nt_status);
 488                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 489                 } else {
 490
 491                         reply_code = "AF";
 492                         reply_arg = talloc_asprintf(*gensec_state,
 493                                                     "%s%s%s", session_info->server_info->domain_name,
 494                                                     lp_winbind_separator(), session_info->server_info->account_name);
 495                         talloc_free(session_info);
 496                 }
 497         } else if ((*gensec_state)->gensec_role == GENSEC_CLIENT) {
 498                 reply_code = "AF";
 499                 reply_arg = NULL;
 500         } else {
 501                 abort();
 502         }
 503
 504         switch (stdio_helper_mode) {
 505         case GSS_SPNEGO_SERVER:
 506                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 507                           out_base64 ? out_base64 : "*",
 508                           reply_arg ? reply_arg : "*");
 509                 break;
 510         default:
 511                 if (out_base64) {
 512                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 513                 } else if (reply_arg) {
 514                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 515                 } else {
 516                         mux_printf(mux_id, "%s\n", reply_code);
 517                 }
 518         }
 519
 520         SAFE_FREE(out_base64);
 521         return;
 522 }
 523
 524 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 525                                          char *buf, int length, void **private,
 526                                          unsigned int mux_id, void **private2)
 527 {
 528         char *request, *parameter;
 529         static DATA_BLOB challenge;
 530         static DATA_BLOB lm_response;
 531         static DATA_BLOB nt_response;
 532         static char *full_username;
 533         static char *username;
 534         static char *domain;
 535         static char *plaintext_password;
 536         static BOOL ntlm_server_1_user_session_key;
 537         static BOOL ntlm_server_1_lm_session_key;
 538
 539         if (strequal(buf, ".")) {
 540                 if (!full_username && !username) {
 541                         mux_printf(mux_id, "Error: No username supplied!\n");
 542                 } else if (plaintext_password) {
 543                         /* handle this request as plaintext */
 544                         if (!full_username) {
 545                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 546                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 547                                         return;
 548                                 }
 549                         }
 550                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 551                                 mux_printf(mux_id, "Authenticated: Yes\n");
 552                         } else {
 553                                 mux_printf(mux_id, "Authenticated: No\n");
 554                         }
 555                 } else if (!lm_response.data && !nt_response.data) {
 556                         mux_printf(mux_id, "Error: No password supplied!\n");
 557                 } else if (!challenge.data) {
 558                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 559                 } else {
 560                         char *error_string = NULL;
 561                         DATA_BLOB lm_key;
 562                         DATA_BLOB user_session_key;
 563                         uint32_t flags = 0;
 564
 565                         if (full_username && !username) {
 566                                 fstring fstr_user;
 567                                 fstring fstr_domain;
 568
 569                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 570                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 571                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 572                                 }
 573                                 SAFE_FREE(username);
 574                                 SAFE_FREE(domain);
 575                                 username = smb_xstrdup(fstr_user);
 576                                 domain = smb_xstrdup(fstr_domain);
 577                         }
 578
 579                         if (!domain) {
 580                                 domain = smb_xstrdup(lp_workgroup());
 581                         }
 582
 583                         if (ntlm_server_1_lm_session_key)
 584                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 585
 586                         if (ntlm_server_1_user_session_key)
 587                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 588
 589                         if (!NT_STATUS_IS_OK(
 590                                     local_pw_check_specified(username,
 591                                                               domain,
 592                                                               lp_netbios_name(),
 593                                                               &challenge,
 594                                                               &lm_response,
 595                                                               &nt_response,
 596                                                               flags,
 597                                                               &lm_key,
 598                                                               &user_session_key,
 599                                                               &error_string,
 600                                                               NULL))) {
 601
 602                                 mux_printf(mux_id, "Authenticated: No\n");
 603                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 604                                 SAFE_FREE(error_string);
 605                         } else {
 606                                 static char zeros[16];
 607                                 char *hex_lm_key;
 608                                 char *hex_user_session_key;
 609
 610                                 mux_printf(mux_id, "Authenticated: Yes\n");
 611
 612                                 if (ntlm_server_1_lm_session_key
 613                                     && lm_key.length
 614                                     && (memcmp(zeros, lm_key.data,
 615                                                                 lm_key.length) != 0)) {
 616                                         hex_encode(lm_key.data,
 617                                                    lm_key.length,
 618                                                    &hex_lm_key);
 619                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 620                                         SAFE_FREE(hex_lm_key);
 621                                 }
 622
 623                                 if (ntlm_server_1_user_session_key
 624                                     && user_session_key.length
 625                                     && (memcmp(zeros, user_session_key.data,
 626                                                user_session_key.length) != 0)) {
 627                                         hex_encode(user_session_key.data,
 628                                                    user_session_key.length,
 629                                                    &hex_user_session_key);
 630                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 631                                         SAFE_FREE(hex_user_session_key);
 632                                 }
 633                         }
 634                 }
 635                 /* clear out the state */
 636                 challenge = data_blob(NULL, 0);
 637                 nt_response = data_blob(NULL, 0);
 638                 lm_response = data_blob(NULL, 0);
 639                 SAFE_FREE(full_username);
 640                 SAFE_FREE(username);
 641                 SAFE_FREE(domain);
 642                 SAFE_FREE(plaintext_password);
 643                 ntlm_server_1_user_session_key = False;
 644                 ntlm_server_1_lm_session_key = False;
 645                 mux_printf(mux_id, ".\n");
 646
 647                 return;
 648         }
 649
 650         request = buf;
 651
 652         /* Indicates a base64 encoded structure */
 653         parameter = strstr(request, ":: ");
 654         if (!parameter) {
 655                 parameter = strstr(request, ": ");
 656
 657                 if (!parameter) {
 658                         DEBUG(0, ("Parameter not found!\n"));
 659                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 660                         return;
 661                 }
 662
 663                 parameter[0] ='\0';
 664                 parameter++;
 665                 parameter[0] ='\0';
 666                 parameter++;
 667
 668         } else {
 669                 parameter[0] ='\0';
 670                 parameter++;
 671                 parameter[0] ='\0';
 672                 parameter++;
 673                 parameter[0] ='\0';
 674                 parameter++;
 675
 676                 base64_decode_inplace(parameter);
 677         }
 678
 679         if (strequal(request, "LANMAN-Challenge")) {
 680                 challenge = strhex_to_data_blob(parameter);
 681                 if (challenge.length != 8) {
 682                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 683                                   parameter,
 684                                   (int)challenge.length);
 685                         challenge = data_blob(NULL, 0);
 686                 }
 687         } else if (strequal(request, "NT-Response")) {
 688                 nt_response = strhex_to_data_blob(parameter);
 689                 if (nt_response.length < 24) {
 690                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 691                                   parameter,
 692                                   (int)nt_response.length);
 693                         nt_response = data_blob(NULL, 0);
 694                 }
 695         } else if (strequal(request, "LANMAN-Response")) {
 696                 lm_response = strhex_to_data_blob(parameter);
 697                 if (lm_response.length != 24) {
 698                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 699                                   parameter,
 700                                   (int)lm_response.length);
 701                         lm_response = data_blob(NULL, 0);
 702                 }
 703         } else if (strequal(request, "Password")) {
 704                 plaintext_password = smb_xstrdup(parameter);
 705         } else if (strequal(request, "NT-Domain")) {
 706                 domain = smb_xstrdup(parameter);
 707         } else if (strequal(request, "Username")) {
 708                 username = smb_xstrdup(parameter);
 709         } else if (strequal(request, "Full-Username")) {
 710                 full_username = smb_xstrdup(parameter);
 711         } else if (strequal(request, "Request-User-Session-Key")) {
 712                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 713         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 714                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 715         } else {
 716                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 717         }
 718 }
 719
 720 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 721                                  stdio_helper_function fn, void **private2)
 722 {
 723         char buf[SQUID_BUFFER_SIZE+1];
 724         unsigned int mux_id;
 725         int length;
 726         char *c;
 727         static BOOL err;
 728         struct mux_private {
 729                 unsigned int max_mux;
 730                 void **private_pointers;
 731         };
 732
 733         static struct mux_private *mux_private;
 734         static void *normal_private;
 735         void **private;
 736
 737         /* this is not a typo - x_fgets doesn't work too well under squid */
 738         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 739                 if (ferror(stdin)) {
 740                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 741                                   strerror(ferror(stdin))));
 742
 743                         exit(1);    /* BIIG buffer */
 744                 }
 745                 exit(0);
 746         }
 747
 748         c=memchr(buf,'\n',sizeof(buf)-1);
 749         if (c) {
 750                 *c = '\0';
 751                 length = c-buf;
 752         } else {
 753                 err = 1;
 754                 return;
 755         }
 756         if (err) {
 757                 DEBUG(0, ("Oversized message\n"));
 758                 x_fprintf(x_stdout, "ERR\n");
 759                 err = 0;
 760                 return;
 761         }
 762
 763         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 764
 765         if (buf[0] == '\0') {
 766                 DEBUG(0, ("Invalid Request (empty)\n"));
 767                 x_fprintf(x_stdout, "ERR\n");
 768                 return;
 769         }
 770
 771         if (opt_multiplex) {
 772                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 773                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 774                         x_fprintf(x_stdout, "ERR\n");
 775                         return;
 776                 }
 777                 if (!mux_private) {
 778                         mux_private = talloc(NULL, struct mux_private);
 779                         mux_private->max_mux = 0;
 780                         mux_private->private_pointers = NULL;
 781                 }
 782
 783                 c=strchr(buf,' ');
 784                 if (!c) {
 785                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 786                         x_fprintf(x_stdout, "ERR\n");
 787                         return;
 788                 }
 789                 c++;
 790                 if (mux_id >= mux_private->max_mux) {
 791                         unsigned int prev_max = mux_private->max_mux;
 792                         mux_private->max_mux = mux_id + 1;
 793                         mux_private->private_pointers
 794                                 = talloc_realloc(mux_private,
 795                                                    mux_private->private_pointers,
 796                                                    void *, mux_private->max_mux);
 797                         memset(&mux_private->private_pointers[prev_max], '\0',
 798                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 799                 };
 800
 801                 private = &mux_private->private_pointers[mux_id];
 802         } else {
 803                 c = buf;
 804                 private = &normal_private;
 805         }
 806
 807         fn(helper_mode, c, length, private, mux_id, private2);
 808 }
 809
 810 static void squid_stream(enum stdio_helper_mode stdio_mode,
 811                          stdio_helper_function fn) {
 812         /* initialize FDescs */
 813         x_setbuf(x_stdout, NULL);
 814         x_setbuf(x_stderr, NULL);
 815         while(1) {
 816                 manage_squid_request(stdio_mode, fn, NULL);
 817         }
 818 }
 819
 820
 821 /* Main program */
 822
 823 enum {
 824         OPT_USERNAME = 1000,
 825         OPT_DOMAIN,
 826         OPT_WORKSTATION,
 827         OPT_CHALLENGE,
 828         OPT_RESPONSE,
 829         OPT_LM,
 830         OPT_NT,
 831         OPT_PASSWORD,
 832         OPT_LM_KEY,
 833         OPT_USER_SESSION_KEY,
 834         OPT_DIAGNOSTICS,
 835         OPT_REQUIRE_MEMBERSHIP,
 836         OPT_MULTIPLEX,
 837 };
 838
 839  int main(int argc, const char **argv)
 840 {
 841         static const char *helper_protocol;
 842         int opt;
 843
 844         poptContext pc;
 845
 846         /* NOTE: DO NOT change this interface without considering the implications!
 847            This is an external interface, which other programs will use to interact
 848            with this helper.
 849         */
 850
 851         /* We do not use single-letter command abbreviations, because they harm future
 852            interface stability. */
 853
 854         struct poptOption long_options[] = {
 855                 POPT_AUTOHELP
 856                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 857                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 858                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 859                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 860                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 861                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 862                 POPT_COMMON_SAMBA
 863                 POPT_TABLEEND
 864         };
 865
 866         /* Samba client initialisation */
 867
 868         setup_logging("ntlm_auth", DEBUG_STDERR);
 869
 870         if (!lp_load(dyn_CONFIGFILE, True, False, False)) {
 871                 d_fprintf(stderr, "wbinfo: error opening config file %s. Error was %s\n",
 872                         dyn_CONFIGFILE, strerror(errno));
 873                 exit(1);
 874         }
 875
 876         /* Parse options */
 877
 878         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 879
 880         /* Parse command line options */
 881
 882         if (argc == 1) {
 883                 poptPrintHelp(pc, stderr, 0);
 884                 return 1;
 885         }
 886
 887         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 888                             POPT_CONTEXT_KEEP_FIRST);
 889
 890         while((opt = poptGetNextOpt(pc)) != -1) {
 891                 if (opt < -1) {
 892                         break;
 893                 }
 894         }
 895         if (opt < -1) {
 896                 fprintf(stderr, "%s: %s\n",
 897                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 898                         poptStrerror(opt));
 899                 return 1;
 900         }
 901
 902         ntlm_auth_init_subsystems;
 903
 904
 905         if (opt_domain == NULL) {
 906                 opt_domain = lp_workgroup();
 907         }
 908
 909         if (helper_protocol) {
 910                 int i;
 911                 for (i=0; i<NUM_HELPER_MODES; i++) {
 912                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 913                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 914                                 exit(0);
 915                         }
 916                 }
 917                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 918
 919                 for (i=0; i<NUM_HELPER_MODES; i++) {
 920                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 921                 }
 922
 923                 exit(1);
 924         }
 925
 926         if (!opt_username) {
 927                 x_fprintf(x_stderr, "username must be specified!\n\n");
 928                 poptPrintHelp(pc, stderr, 0);
 929                 exit(1);
 930         }
 931
 932         if (opt_workstation == NULL) {
 933                 opt_workstation = lp_netbios_name();
 934         }
 935
 936         if (!opt_password) {
 937                 opt_password = getpass("password: ");
 938         }
 939
 940         {
 941                 char *user;
 942
 943                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
 944                 if (!check_plaintext_auth(user, opt_password, True)) {
 945                         return 1;
 946                 }
 947         }
 948
 949         /* Exit code */
 950
 951         poptFreeContext(pc);
 952         return 0;
 953 }