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 "auth/auth_sam.h"
  30 #include "pstring.h"
  31 #include "libcli/auth/libcli_auth.h"
  32 #include "libcli/security/security.h"
  33 #include "lib/ldb/include/ldb.h"
  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, void **private2);
  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, void **private2);
  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, void **private2);
  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, void **private2);
  67
  68 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  69                                  stdio_helper_function fn, void **private2);
  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 static const char *opt_username;
  89 static const char *opt_domain;
  90 static const char *opt_workstation;
  91 static const char *opt_password;
  92 static 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 /**
 133  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 134  **/
 135 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 136 {
 137         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 138         ret.length = ldb_base64_decode((char *)ret.data);
 139         return ret;
 140 }
 141
 142 /**
 143  * Encode a base64 string into a talloc()ed string caller to free.
 144  **/
 145 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 146 {
 147         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 148 }
 149
 150 /**
 151  * Decode a base64 string in-place - wrapper for the above
 152  **/
 153 static void base64_decode_inplace(char *s)
 154 {
 155         ldb_base64_decode(s);
 156 }
 157
 158
 159
 160 /* Authenticate a user with a plaintext password */
 161
 162 static BOOL check_plaintext_auth(const char *user, const char *pass,
 163                                  BOOL stdout_diagnostics)
 164 {
 165         return (strcmp(pass, opt_password) == 0);
 166 }
 167
 168 /* authenticate a user with an encrypted username/password */
 169
 170 static NTSTATUS local_pw_check_specified(const char *username,
 171                                          const char *domain,
 172                                          const char *workstation,
 173                                          const DATA_BLOB *challenge,
 174                                          const DATA_BLOB *lm_response,
 175                                          const DATA_BLOB *nt_response,
 176                                          uint32_t flags,
 177                                          DATA_BLOB *lm_session_key,
 178                                          DATA_BLOB *user_session_key,
 179                                          char **error_string,
 180                                          char **unix_name)
 181 {
 182         NTSTATUS nt_status;
 183         struct samr_Password lm_pw, nt_pw;
 184         struct samr_Password *lm_pwd, *nt_pwd;
 185         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 186         if (!mem_ctx) {
 187                 nt_status = NT_STATUS_NO_MEMORY;
 188         } else {
 189
 190                 E_md4hash(opt_password, nt_pw.hash);
 191                 if (E_deshash(opt_password, lm_pw.hash)) {
 192                         lm_pwd = &lm_pw;
 193                 } else {
 194                         lm_pwd = NULL;
 195                 }
 196                 nt_pwd = &nt_pw;
 197
 198
 199                 nt_status = ntlm_password_check(mem_ctx,
 200                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 201                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 202                                                 challenge,
 203                                                 lm_response,
 204                                                 nt_response,
 205                                                 username,
 206                                                 username,
 207                                                 domain,
 208                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 209
 210                 if (NT_STATUS_IS_OK(nt_status)) {
 211                         if (unix_name) {
 212                                 asprintf(unix_name,
 213                                          "%s%c%s", domain,
 214                                          *lp_winbind_separator(),
 215                                          username);
 216                         }
 217                 } else {
 218                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 219                                   domain, username, workstation,
 220                                   nt_errstr(nt_status)));
 221                 }
 222                 talloc_free(mem_ctx);
 223         }
 224         if (error_string) {
 225                 *error_string = strdup(nt_errstr(nt_status));
 226         }
 227         return nt_status;
 228
 229
 230 }
 231
 232 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 233                                        char *buf, int length, void **private,
 234                                        unsigned int mux_id, void **private2)
 235 {
 236         char *user, *pass;
 237         user=buf;
 238
 239         pass=memchr(buf,' ',length);
 240         if (!pass) {
 241                 DEBUG(2, ("Password not found. Denying access\n"));
 242                 mux_printf(mux_id, "ERR\n");
 243                 return;
 244         }
 245         *pass='\0';
 246         pass++;
 247
 248         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 249                 rfc1738_unescape(user);
 250                 rfc1738_unescape(pass);
 251         }
 252
 253         if (check_plaintext_auth(user, pass, False)) {
 254                 mux_printf(mux_id, "OK\n");
 255         } else {
 256                 mux_printf(mux_id, "ERR\n");
 257         }
 258 }
 259
 260 /* This is a bit hairy, but the basic idea is to do a password callback
 261    to the calling application.  The callback comes from within gensec */
 262
 263 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 264                                          char *buf, int length, void **private,
 265                                          unsigned int mux_id, void **password)
 266 {
 267         DATA_BLOB in;
 268         if (strlen(buf) < 2) {
 269                 DEBUG(1, ("query [%s] invalid", buf));
 270                 mux_printf(mux_id, "BH\n");
 271                 return;
 272         }
 273
 274         if (strlen(buf) > 3) {
 275                 in = base64_decode_data_blob(NULL, buf + 3);
 276         } else {
 277                 in = data_blob(NULL, 0);
 278         }
 279
 280         if (strncmp(buf, "PW ", 3) == 0) {
 281
 282                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 283                                            (const char *)in.data, in.length);
 284
 285                 if (*password == NULL) {
 286                         DEBUG(1, ("Out of memory\n"));
 287                         mux_printf(mux_id, "BH\n");
 288                         data_blob_free(&in);
 289                         return;
 290                 }
 291
 292                 mux_printf(mux_id, "OK\n");
 293                 data_blob_free(&in);
 294                 return;
 295         }
 296         DEBUG(1, ("Asked for (and expected) a password\n"));
 297         mux_printf(mux_id, "BH\n");
 298         data_blob_free(&in);
 299 }
 300
 301 /**
 302  * Callback for password credentails.  This is not async, and when
 303  * GENSEC and the credentails code is made async, it will look rather
 304  * different.
 305  */
 306
 307 static const char *get_password(struct cli_credentials *credentials)
 308 {
 309         char *password = NULL;
 310
 311         /* Ask for a password */
 312         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 313         credentials->priv_data = NULL;
 314
 315         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 316         return password;
 317 }
 318
 319 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 320                                   char *buf, int length, void **private,
 321                                   unsigned int mux_id, void **private2)
 322 {
 323         DATA_BLOB in;
 324         DATA_BLOB out = data_blob(NULL, 0);
 325         char *out_base64 = NULL;
 326         const char *reply_arg = NULL;
 327         struct gensec_ntlm_state {
 328                 struct gensec_security *gensec_state;
 329                 const char *set_password;
 330         };
 331         struct gensec_ntlm_state *state;
 332
 333         NTSTATUS nt_status;
 334         BOOL first = False;
 335         const char *reply_code;
 336         struct cli_credentials *creds;
 337
 338         TALLOC_CTX *mem_ctx;
 339
 340         if (*private) {
 341                 state = *private;
 342         } else {
 343                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 344                 if (!state) {
 345                         mux_printf(mux_id, "BH No Memory\n");
 346                         exit(1);
 347                 }
 348                 *private = state;
 349                 if (opt_password) {
 350                         state->set_password = opt_password;
 351                 }
 352         }
 353
 354         if (strlen(buf) < 2) {
 355                 DEBUG(1, ("query [%s] invalid", buf));
 356                 mux_printf(mux_id, "BH\n");
 357                 return;
 358         }
 359
 360         if (strlen(buf) > 3) {
 361                 in = base64_decode_data_blob(NULL, buf + 3);
 362         } else {
 363                 in = data_blob(NULL, 0);
 364         }
 365
 366         if (strncmp(buf, "YR", 2) == 0) {
 367                 if (state->gensec_state) {
 368                         talloc_free(state->gensec_state);
 369                         state->gensec_state = NULL;
 370                 }
 371         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 372                 /* do nothing */
 373                 data_blob_free(&in);
 374                 return;
 375         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 376                     (strncmp(buf, "KK ", 3) != 0) &&
 377                     (strncmp(buf, "AF ", 3) != 0) &&
 378                     (strncmp(buf, "NA ", 3) != 0) &&
 379                     (strncmp(buf, "UG", 2) != 0) &&
 380                     (strncmp(buf, "PW ", 3) != 0)) {
 381                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 382                 mux_printf(mux_id, "BH\n");
 383                 data_blob_free(&in);
 384                 return;
 385         }
 386
 387         /* setup gensec */
 388         if (!(state->gensec_state)) {
 389                 switch (stdio_helper_mode) {
 390                 case GSS_SPNEGO_CLIENT:
 391                 case NTLMSSP_CLIENT_1:
 392                         /* setup the client side */
 393
 394                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 395                         if (!NT_STATUS_IS_OK(nt_status)) {
 396                                 exit(1);
 397                         }
 398
 399                         break;
 400                 case GSS_SPNEGO_SERVER:
 401                 case SQUID_2_5_NTLMSSP:
 402                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, &state->gensec_state, NULL))) {
 403                                 exit(1);
 404                         }
 405                         break;
 406                 default:
 407                         abort();
 408                 }
 409
 410                 creds = cli_credentials_init(state->gensec_state);
 411                 cli_credentials_set_conf(creds);
 412                 if (opt_username) {
 413                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 414                 }
 415                 if (opt_domain) {
 416                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 417                 }
 418                 if (state->set_password) {
 419                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 420                 } else {
 421                         cli_credentials_set_password_callback(creds, get_password);
 422                         creds->priv_data = (void*)mux_id;
 423                 }
 424                 if (opt_workstation) {
 425                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 426                 }
 427
 428                 switch (stdio_helper_mode) {
 429                 case GSS_SPNEGO_SERVER:
 430                 case SQUID_2_5_NTLMSSP:
 431                         cli_credentials_set_machine_account(creds);
 432                         break;
 433                 default:
 434                         break;
 435                 }
 436
 437                 gensec_set_credentials(state->gensec_state, creds);
 438
 439                 switch (stdio_helper_mode) {
 440                 case GSS_SPNEGO_CLIENT:
 441                 case GSS_SPNEGO_SERVER:
 442                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 443                         if (!in.length) {
 444                                 first = True;
 445                         }
 446                         break;
 447                 case NTLMSSP_CLIENT_1:
 448                         if (!in.length) {
 449                                 first = True;
 450                         }
 451                         /* fall through */
 452                 case SQUID_2_5_NTLMSSP:
 453                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 454                         break;
 455                 default:
 456                         abort();
 457                 }
 458
 459                 if (!NT_STATUS_IS_OK(nt_status)) {
 460                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 461                         mux_printf(mux_id, "BH\n");
 462                         return;
 463                 }
 464
 465         }
 466
 467         /* update */
 468         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 469
 470         if (strncmp(buf, "PW ", 3) == 0) {
 471                 state->set_password = talloc_strndup(state,
 472                                                      (const char *)in.data,
 473                                                      in.length);
 474
 475                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 476                                              state->set_password,
 477                                              CRED_SPECIFIED);
 478                 mux_printf(mux_id, "OK\n");
 479                 data_blob_free(&in);
 480                 talloc_free(mem_ctx);
 481                 return;
 482         }
 483
 484         if (strncmp(buf, "UG", 2) == 0) {
 485                 int i;
 486                 char *grouplist = NULL;
 487                 struct auth_session_info *session_info;
 488
 489                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 490                 if (!NT_STATUS_IS_OK(nt_status)) {
 491                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 492                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 493                         data_blob_free(&in);
 494                         talloc_free(mem_ctx);
 495                         return;
 496                 }
 497
 498                 /* get the string onto the context */
 499                 grouplist = talloc_strdup(mem_ctx, "");
 500
 501                 for (i=0; i<session_info->security_token->num_sids; i++) {
 502                         struct security_token *token = session_info->security_token;
 503                         const char *sidstr = dom_sid_string(session_info,
 504                                                             token->sids[i]);
 505                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 506                 }
 507
 508                 mux_printf(mux_id, "GL %s\n", grouplist);
 509                 talloc_free(session_info);
 510                 data_blob_free(&in);
 511                 talloc_free(mem_ctx);
 512                 return;
 513         }
 514
 515         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 516
 517         /* don't leak 'bad password'/'no such user' info to the network client */
 518         nt_status = auth_nt_status_squash(nt_status);
 519
 520         if (out.length) {
 521                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 522         } else {
 523                 out_base64 = NULL;
 524         }
 525
 526         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 527                 reply_arg = "*";
 528                 if (first) {
 529                         reply_code = "YR";
 530                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 531                         reply_code = "KK";
 532                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 533                         reply_code = "TT";
 534                 } else {
 535                         abort();
 536                 }
 537
 538
 539         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 540                 reply_code = "BH";
 541                 reply_arg = nt_errstr(nt_status);
 542                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 543         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 544                 reply_code = "BH";
 545                 reply_arg = nt_errstr(nt_status);
 546                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 547         } else if (!NT_STATUS_IS_OK(nt_status)) {
 548                 reply_code = "NA";
 549                 reply_arg = nt_errstr(nt_status);
 550                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 551         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 552                 struct auth_session_info *session_info;
 553
 554                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 555                 if (!NT_STATUS_IS_OK(nt_status)) {
 556                         reply_code = "BH";
 557                         reply_arg = nt_errstr(nt_status);
 558                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 559                 } else {
 560
 561                         reply_code = "AF";
 562                         reply_arg = talloc_asprintf(state->gensec_state,
 563                                                     "%s%s%s", session_info->server_info->domain_name,
 564                                                     lp_winbind_separator(), session_info->server_info->account_name);
 565                         talloc_free(session_info);
 566                 }
 567         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 568                 reply_code = "AF";
 569                 reply_arg = out_base64;
 570         } else {
 571                 abort();
 572         }
 573
 574         switch (stdio_helper_mode) {
 575         case GSS_SPNEGO_SERVER:
 576                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 577                           out_base64 ? out_base64 : "*",
 578                           reply_arg ? reply_arg : "*");
 579                 break;
 580         default:
 581                 if (out_base64) {
 582                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 583                 } else if (reply_arg) {
 584                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 585                 } else {
 586                         mux_printf(mux_id, "%s\n", reply_code);
 587                 }
 588         }
 589
 590         talloc_free(mem_ctx);
 591         return;
 592 }
 593
 594 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 595                                          char *buf, int length, void **private,
 596                                          unsigned int mux_id, void **private2)
 597 {
 598         char *request, *parameter;
 599         static DATA_BLOB challenge;
 600         static DATA_BLOB lm_response;
 601         static DATA_BLOB nt_response;
 602         static char *full_username;
 603         static char *username;
 604         static char *domain;
 605         static char *plaintext_password;
 606         static BOOL ntlm_server_1_user_session_key;
 607         static BOOL ntlm_server_1_lm_session_key;
 608
 609         if (strequal(buf, ".")) {
 610                 if (!full_username && !username) {
 611                         mux_printf(mux_id, "Error: No username supplied!\n");
 612                 } else if (plaintext_password) {
 613                         /* handle this request as plaintext */
 614                         if (!full_username) {
 615                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 616                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 617                                         return;
 618                                 }
 619                         }
 620                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 621                                 mux_printf(mux_id, "Authenticated: Yes\n");
 622                         } else {
 623                                 mux_printf(mux_id, "Authenticated: No\n");
 624                         }
 625                 } else if (!lm_response.data && !nt_response.data) {
 626                         mux_printf(mux_id, "Error: No password supplied!\n");
 627                 } else if (!challenge.data) {
 628                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 629                 } else {
 630                         char *error_string = NULL;
 631                         DATA_BLOB lm_key;
 632                         DATA_BLOB user_session_key;
 633                         uint32_t flags = 0;
 634
 635                         if (full_username && !username) {
 636                                 fstring fstr_user;
 637                                 fstring fstr_domain;
 638
 639                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 640                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 641                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 642                                 }
 643                                 SAFE_FREE(username);
 644                                 SAFE_FREE(domain);
 645                                 username = smb_xstrdup(fstr_user);
 646                                 domain = smb_xstrdup(fstr_domain);
 647                         }
 648
 649                         if (!domain) {
 650                                 domain = smb_xstrdup(lp_workgroup());
 651                         }
 652
 653                         if (ntlm_server_1_lm_session_key)
 654                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 655
 656                         if (ntlm_server_1_user_session_key)
 657                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 658
 659                         if (!NT_STATUS_IS_OK(
 660                                     local_pw_check_specified(username,
 661                                                               domain,
 662                                                               lp_netbios_name(),
 663                                                               &challenge,
 664                                                               &lm_response,
 665                                                               &nt_response,
 666                                                               flags,
 667                                                               &lm_key,
 668                                                               &user_session_key,
 669                                                               &error_string,
 670                                                               NULL))) {
 671
 672                                 mux_printf(mux_id, "Authenticated: No\n");
 673                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 674                                 SAFE_FREE(error_string);
 675                         } else {
 676                                 static char zeros[16];
 677                                 char *hex_lm_key;
 678                                 char *hex_user_session_key;
 679
 680                                 mux_printf(mux_id, "Authenticated: Yes\n");
 681
 682                                 if (ntlm_server_1_lm_session_key
 683                                     && lm_key.length
 684                                     && (memcmp(zeros, lm_key.data,
 685                                                                 lm_key.length) != 0)) {
 686                                         hex_encode(lm_key.data,
 687                                                    lm_key.length,
 688                                                    &hex_lm_key);
 689                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 690                                         SAFE_FREE(hex_lm_key);
 691                                 }
 692
 693                                 if (ntlm_server_1_user_session_key
 694                                     && user_session_key.length
 695                                     && (memcmp(zeros, user_session_key.data,
 696                                                user_session_key.length) != 0)) {
 697                                         hex_encode(user_session_key.data,
 698                                                    user_session_key.length,
 699                                                    &hex_user_session_key);
 700                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 701                                         SAFE_FREE(hex_user_session_key);
 702                                 }
 703                         }
 704                 }
 705                 /* clear out the state */
 706                 challenge = data_blob(NULL, 0);
 707                 nt_response = data_blob(NULL, 0);
 708                 lm_response = data_blob(NULL, 0);
 709                 SAFE_FREE(full_username);
 710                 SAFE_FREE(username);
 711                 SAFE_FREE(domain);
 712                 SAFE_FREE(plaintext_password);
 713                 ntlm_server_1_user_session_key = False;
 714                 ntlm_server_1_lm_session_key = False;
 715                 mux_printf(mux_id, ".\n");
 716
 717                 return;
 718         }
 719
 720         request = buf;
 721
 722         /* Indicates a base64 encoded structure */
 723         parameter = strstr(request, ":: ");
 724         if (!parameter) {
 725                 parameter = strstr(request, ": ");
 726
 727                 if (!parameter) {
 728                         DEBUG(0, ("Parameter not found!\n"));
 729                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 730                         return;
 731                 }
 732
 733                 parameter[0] ='\0';
 734                 parameter++;
 735                 parameter[0] ='\0';
 736                 parameter++;
 737
 738         } else {
 739                 parameter[0] ='\0';
 740                 parameter++;
 741                 parameter[0] ='\0';
 742                 parameter++;
 743                 parameter[0] ='\0';
 744                 parameter++;
 745
 746                 base64_decode_inplace(parameter);
 747         }
 748
 749         if (strequal(request, "LANMAN-Challenge")) {
 750                 challenge = strhex_to_data_blob(parameter);
 751                 if (challenge.length != 8) {
 752                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 753                                   parameter,
 754                                   (int)challenge.length);
 755                         challenge = data_blob(NULL, 0);
 756                 }
 757         } else if (strequal(request, "NT-Response")) {
 758                 nt_response = strhex_to_data_blob(parameter);
 759                 if (nt_response.length < 24) {
 760                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 761                                   parameter,
 762                                   (int)nt_response.length);
 763                         nt_response = data_blob(NULL, 0);
 764                 }
 765         } else if (strequal(request, "LANMAN-Response")) {
 766                 lm_response = strhex_to_data_blob(parameter);
 767                 if (lm_response.length != 24) {
 768                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 769                                   parameter,
 770                                   (int)lm_response.length);
 771                         lm_response = data_blob(NULL, 0);
 772                 }
 773         } else if (strequal(request, "Password")) {
 774                 plaintext_password = smb_xstrdup(parameter);
 775         } else if (strequal(request, "NT-Domain")) {
 776                 domain = smb_xstrdup(parameter);
 777         } else if (strequal(request, "Username")) {
 778                 username = smb_xstrdup(parameter);
 779         } else if (strequal(request, "Full-Username")) {
 780                 full_username = smb_xstrdup(parameter);
 781         } else if (strequal(request, "Request-User-Session-Key")) {
 782                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 783         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 784                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 785         } else {
 786                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 787         }
 788 }
 789
 790 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 791                                  stdio_helper_function fn, void **private2)
 792 {
 793         char buf[SQUID_BUFFER_SIZE+1];
 794         unsigned int mux_id = 0;
 795         int length;
 796         char *c;
 797         static BOOL err;
 798         struct mux_private {
 799                 unsigned int max_mux;
 800                 void **private_pointers;
 801         };
 802
 803         static struct mux_private *mux_private;
 804         static void *normal_private;
 805         void **private;
 806
 807         /* this is not a typo - x_fgets doesn't work too well under squid */
 808         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 809                 if (ferror(stdin)) {
 810                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 811                                   strerror(ferror(stdin))));
 812
 813                         exit(1);    /* BIIG buffer */
 814                 }
 815                 exit(0);
 816         }
 817
 818         c=memchr(buf,'\n',sizeof(buf)-1);
 819         if (c) {
 820                 *c = '\0';
 821                 length = c-buf;
 822         } else {
 823                 err = 1;
 824                 return;
 825         }
 826         if (err) {
 827                 DEBUG(0, ("Oversized message\n"));
 828                 x_fprintf(x_stdout, "ERR\n");
 829                 err = 0;
 830                 return;
 831         }
 832
 833         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 834
 835         if (buf[0] == '\0') {
 836                 DEBUG(0, ("Invalid Request (empty)\n"));
 837                 x_fprintf(x_stdout, "ERR\n");
 838                 return;
 839         }
 840
 841         if (opt_multiplex) {
 842                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 843                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 844                         x_fprintf(x_stdout, "ERR\n");
 845                         return;
 846                 }
 847                 if (!mux_private) {
 848                         mux_private = talloc(NULL, struct mux_private);
 849                         mux_private->max_mux = 0;
 850                         mux_private->private_pointers = NULL;
 851                 }
 852
 853                 c=strchr(buf,' ');
 854                 if (!c) {
 855                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 856                         x_fprintf(x_stdout, "ERR\n");
 857                         return;
 858                 }
 859                 c++;
 860                 if (mux_id >= mux_private->max_mux) {
 861                         unsigned int prev_max = mux_private->max_mux;
 862                         mux_private->max_mux = mux_id + 1;
 863                         mux_private->private_pointers
 864                                 = talloc_realloc(mux_private,
 865                                                    mux_private->private_pointers,
 866                                                    void *, mux_private->max_mux);
 867                         memset(&mux_private->private_pointers[prev_max], '\0',
 868                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 869                 };
 870
 871                 private = &mux_private->private_pointers[mux_id];
 872         } else {
 873                 c = buf;
 874                 private = &normal_private;
 875         }
 876
 877         fn(helper_mode, c, length, private, mux_id, private2);
 878 }
 879
 880 static void squid_stream(enum stdio_helper_mode stdio_mode,
 881                          stdio_helper_function fn) {
 882         /* initialize FDescs */
 883         x_setbuf(x_stdout, NULL);
 884         x_setbuf(x_stderr, NULL);
 885         while(1) {
 886                 manage_squid_request(stdio_mode, fn, NULL);
 887         }
 888 }
 889
 890
 891 /* Main program */
 892
 893 enum {
 894         OPT_USERNAME = 1000,
 895         OPT_DOMAIN,
 896         OPT_WORKSTATION,
 897         OPT_CHALLENGE,
 898         OPT_RESPONSE,
 899         OPT_LM,
 900         OPT_NT,
 901         OPT_PASSWORD,
 902         OPT_LM_KEY,
 903         OPT_USER_SESSION_KEY,
 904         OPT_DIAGNOSTICS,
 905         OPT_REQUIRE_MEMBERSHIP,
 906         OPT_MULTIPLEX,
 907 };
 908
 909 int main(int argc, const char **argv)
 910 {
 911         static const char *helper_protocol;
 912         int opt;
 913
 914         poptContext pc;
 915
 916         /* NOTE: DO NOT change this interface without considering the implications!
 917            This is an external interface, which other programs will use to interact
 918            with this helper.
 919         */
 920
 921         /* We do not use single-letter command abbreviations, because they harm future
 922            interface stability. */
 923
 924         struct poptOption long_options[] = {
 925                 POPT_AUTOHELP
 926                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 927                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 928                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 929                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 930                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 931                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 932                 POPT_COMMON_SAMBA
 933                 POPT_COMMON_VERSION
 934                 POPT_TABLEEND
 935         };
 936
 937         /* Samba client initialisation */
 938
 939         setup_logging(NULL, DEBUG_STDERR);
 940
 941         /* Parse options */
 942
 943         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 944
 945         /* Parse command line options */
 946
 947         if (argc == 1) {
 948                 poptPrintHelp(pc, stderr, 0);
 949                 return 1;
 950         }
 951
 952         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 953                             POPT_CONTEXT_KEEP_FIRST);
 954
 955         while((opt = poptGetNextOpt(pc)) != -1) {
 956                 if (opt < -1) {
 957                         break;
 958                 }
 959         }
 960         if (opt < -1) {
 961                 fprintf(stderr, "%s: %s\n",
 962                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 963                         poptStrerror(opt));
 964                 return 1;
 965         }
 966
 967         gensec_init();
 968
 969         if (opt_domain == NULL) {
 970                 opt_domain = lp_workgroup();
 971         }
 972
 973         if (helper_protocol) {
 974                 int i;
 975                 for (i=0; i<NUM_HELPER_MODES; i++) {
 976                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 977                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 978                                 exit(0);
 979                         }
 980                 }
 981                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 982
 983                 for (i=0; i<NUM_HELPER_MODES; i++) {
 984                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 985                 }
 986
 987                 exit(1);
 988         }
 989
 990         if (!opt_username) {
 991                 x_fprintf(x_stderr, "username must be specified!\n\n");
 992                 poptPrintHelp(pc, stderr, 0);
 993                 exit(1);
 994         }
 995
 996         if (opt_workstation == NULL) {
 997                 opt_workstation = lp_netbios_name();
 998         }
 999
1000         if (!opt_password) {
1001                 opt_password = getpass("password: ");
1002         }
1003
1004         {
1005                 char *user;
1006
1007                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
1008                 if (!check_plaintext_auth(user, opt_password, True)) {
1009                         return 1;
1010                 }
1011         }
1012
1013         /* Exit code */
1014
1015         poptFreeContext(pc);
1016         return 0;
1017 }