source/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 "libcli/security/security.h"
  32 #include "lib/ldb/include/ldb.h"
  33
  34 #define SQUID_BUFFER_SIZE 2010
  35
  36 enum stdio_helper_mode {
  37         SQUID_2_4_BASIC,
  38         SQUID_2_5_BASIC,
  39         SQUID_2_5_NTLMSSP,
  40         NTLMSSP_CLIENT_1,
  41         GSS_SPNEGO_CLIENT,
  42         GSS_SPNEGO_SERVER,
  43         NTLM_SERVER_1,
  44         NUM_HELPER_MODES
  45 };
  46
  47 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  48 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  49
  50
  51 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  52                                       char *buf, int length, void **private,
  53                                       unsigned int mux_id, void **private2);
  54
  55 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  56                                         char *buf, int length, void **private,
  57                                         unsigned int mux_id, void **private2);
  58
  59 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  60                                    char *buf, int length, void **private,
  61                                    unsigned int mux_id, void **private2);
  62
  63 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  64                                           char *buf, int length, void **private,
  65                                           unsigned int mux_id, void **private2);
  66
  67 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  68                                  stdio_helper_function fn, void **private2);
  69
  70 static const struct {
  71         enum stdio_helper_mode mode;
  72         const char *name;
  73         stdio_helper_function fn;
  74 } stdio_helper_protocols[] = {
  75         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  76         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  77         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  78         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  79         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  80         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  81         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  82         { NUM_HELPER_MODES, NULL, NULL}
  83 };
  84
  85 extern int winbindd_fd;
  86
  87 static const char *opt_username;
  88 static const char *opt_domain;
  89 static const char *opt_workstation;
  90 static const char *opt_password;
  91 static int opt_multiplex;
  92
  93
  94 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
  95
  96 static void mux_printf(unsigned int mux_id, const char *format, ...)
  97 {
  98         va_list ap;
  99
 100         if (opt_multiplex) {
 101                 x_fprintf(x_stdout, "%d ", mux_id);
 102         }
 103
 104         va_start(ap, format);
 105         x_vfprintf(x_stdout, format, ap);
 106         va_end(ap);
 107 }
 108
 109
 110
 111 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 112    form DOMAIN/user into a domain and a user */
 113
 114 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 115                                         fstring user)
 116 {
 117
 118         char *p = strchr(domuser,*lp_winbind_separator());
 119
 120         if (!p) {
 121                 return False;
 122         }
 123
 124         fstrcpy(user, p+1);
 125         fstrcpy(domain, domuser);
 126         domain[PTR_DIFF(p, domuser)] = 0;
 127
 128         return True;
 129 }
 130
 131 /**
 132  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 133  **/
 134 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 135 {
 136         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 137         ret.length = ldb_base64_decode((char *)ret.data);
 138         return ret;
 139 }
 140
 141 /**
 142  * Encode a base64 string into a talloc()ed string caller to free.
 143  **/
 144 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 145 {
 146         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 147 }
 148
 149 /**
 150  * Decode a base64 string in-place - wrapper for the above
 151  **/
 152 static void base64_decode_inplace(char *s)
 153 {
 154         ldb_base64_decode(s);
 155 }
 156
 157
 158
 159 /* Authenticate a user with a plaintext password */
 160
 161 static BOOL check_plaintext_auth(const char *user, const char *pass,
 162                                  BOOL stdout_diagnostics)
 163 {
 164         return (strcmp(pass, opt_password) == 0);
 165 }
 166
 167 /* authenticate a user with an encrypted username/password */
 168
 169 static NTSTATUS local_pw_check_specified(const char *username,
 170                                          const char *domain,
 171                                          const char *workstation,
 172                                          const DATA_BLOB *challenge,
 173                                          const DATA_BLOB *lm_response,
 174                                          const DATA_BLOB *nt_response,
 175                                          uint32_t flags,
 176                                          DATA_BLOB *lm_session_key,
 177                                          DATA_BLOB *user_session_key,
 178                                          char **error_string,
 179                                          char **unix_name)
 180 {
 181         NTSTATUS nt_status;
 182         struct samr_Password lm_pw, nt_pw;
 183         struct samr_Password *lm_pwd, *nt_pwd;
 184         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 185         if (!mem_ctx) {
 186                 nt_status = NT_STATUS_NO_MEMORY;
 187         } else {
 188
 189                 E_md4hash(opt_password, nt_pw.hash);
 190                 if (E_deshash(opt_password, lm_pw.hash)) {
 191                         lm_pwd = &lm_pw;
 192                 } else {
 193                         lm_pwd = NULL;
 194                 }
 195                 nt_pwd = &nt_pw;
 196
 197
 198                 nt_status = ntlm_password_check(mem_ctx,
 199                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 200                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 201                                                 challenge,
 202                                                 lm_response,
 203                                                 nt_response,
 204                                                 username,
 205                                                 username,
 206                                                 domain,
 207                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 208
 209                 if (NT_STATUS_IS_OK(nt_status)) {
 210                         if (unix_name) {
 211                                 asprintf(unix_name,
 212                                          "%s%c%s", domain,
 213                                          *lp_winbind_separator(),
 214                                          username);
 215                         }
 216                 } else {
 217                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 218                                   domain, username, workstation,
 219                                   nt_errstr(nt_status)));
 220                 }
 221                 talloc_free(mem_ctx);
 222         }
 223         if (error_string) {
 224                 *error_string = strdup(nt_errstr(nt_status));
 225         }
 226         return nt_status;
 227
 228
 229 }
 230
 231 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 232                                        char *buf, int length, void **private,
 233                                        unsigned int mux_id, void **private2)
 234 {
 235         char *user, *pass;
 236         user=buf;
 237
 238         pass=memchr(buf,' ',length);
 239         if (!pass) {
 240                 DEBUG(2, ("Password not found. Denying access\n"));
 241                 mux_printf(mux_id, "ERR\n");
 242                 return;
 243         }
 244         *pass='\0';
 245         pass++;
 246
 247         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 248                 rfc1738_unescape(user);
 249                 rfc1738_unescape(pass);
 250         }
 251
 252         if (check_plaintext_auth(user, pass, False)) {
 253                 mux_printf(mux_id, "OK\n");
 254         } else {
 255                 mux_printf(mux_id, "ERR\n");
 256         }
 257 }
 258
 259 /* This is a bit hairy, but the basic idea is to do a password callback
 260    to the calling application.  The callback comes from within gensec */
 261
 262 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 263                                          char *buf, int length, void **private,
 264                                          unsigned int mux_id, void **password)
 265 {
 266         DATA_BLOB in;
 267         if (strlen(buf) < 2) {
 268                 DEBUG(1, ("query [%s] invalid", buf));
 269                 mux_printf(mux_id, "BH\n");
 270                 return;
 271         }
 272
 273         if (strlen(buf) > 3) {
 274                 in = base64_decode_data_blob(NULL, buf + 3);
 275         } else {
 276                 in = data_blob(NULL, 0);
 277         }
 278
 279         if (strncmp(buf, "PW ", 3) == 0) {
 280
 281                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 282                                            (const char *)in.data, in.length);
 283
 284                 if (*password == NULL) {
 285                         DEBUG(1, ("Out of memory\n"));
 286                         mux_printf(mux_id, "BH\n");
 287                         data_blob_free(&in);
 288                         return;
 289                 }
 290
 291                 mux_printf(mux_id, "OK\n");
 292                 data_blob_free(&in);
 293                 return;
 294         }
 295         DEBUG(1, ("Asked for (and expected) a password\n"));
 296         mux_printf(mux_id, "BH\n");
 297         data_blob_free(&in);
 298 }
 299
 300 /**
 301  * Callback for password credentails.  This is not async, and when
 302  * GENSEC and the credentails code is made async, it will look rather
 303  * different.
 304  */
 305
 306 static const char *get_password(struct cli_credentials *credentials)
 307 {
 308         char *password = NULL;
 309
 310         /* Ask for a password */
 311         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 312         credentials->priv_data = NULL;
 313
 314         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 315         return password;
 316 }
 317
 318 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 319                                   char *buf, int length, void **private,
 320                                   unsigned int mux_id, void **private2)
 321 {
 322         DATA_BLOB in;
 323         DATA_BLOB out = data_blob(NULL, 0);
 324         char *out_base64 = NULL;
 325         const char *reply_arg = NULL;
 326         struct gensec_ntlm_state {
 327                 struct gensec_security *gensec_state;
 328                 const char *set_password;
 329         };
 330         struct gensec_ntlm_state *state;
 331
 332         NTSTATUS nt_status;
 333         BOOL first = False;
 334         const char *reply_code;
 335         struct cli_credentials *creds;
 336
 337         TALLOC_CTX *mem_ctx;
 338
 339         if (*private) {
 340                 state = *private;
 341         } else {
 342                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 343                 if (!state) {
 344                         mux_printf(mux_id, "BH No Memory\n");
 345                         exit(1);
 346                 }
 347                 *private = state;
 348                 if (opt_password) {
 349                         state->set_password = opt_password;
 350                 }
 351         }
 352
 353         if (strlen(buf) < 2) {
 354                 DEBUG(1, ("query [%s] invalid", buf));
 355                 mux_printf(mux_id, "BH\n");
 356                 return;
 357         }
 358
 359         if (strlen(buf) > 3) {
 360                 in = base64_decode_data_blob(NULL, buf + 3);
 361         } else {
 362                 in = data_blob(NULL, 0);
 363         }
 364
 365         if (strncmp(buf, "YR", 2) == 0) {
 366                 if (state->gensec_state) {
 367                         talloc_free(state->gensec_state);
 368                         state->gensec_state = NULL;
 369                 }
 370         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 371                 /* do nothing */
 372                 data_blob_free(&in);
 373                 return;
 374         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 375                     (strncmp(buf, "KK ", 3) != 0) &&
 376                     (strncmp(buf, "AF ", 3) != 0) &&
 377                     (strncmp(buf, "NA ", 3) != 0) &&
 378                     (strncmp(buf, "UG", 2) != 0) &&
 379                     (strncmp(buf, "PW ", 3) != 0)) {
 380                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 381                 mux_printf(mux_id, "BH\n");
 382                 data_blob_free(&in);
 383                 return;
 384         }
 385
 386         /* setup gensec */
 387         if (!(state->gensec_state)) {
 388                 switch (stdio_helper_mode) {
 389                 case GSS_SPNEGO_CLIENT:
 390                 case NTLMSSP_CLIENT_1:
 391                         /* setup the client side */
 392
 393                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 394                         if (!NT_STATUS_IS_OK(nt_status)) {
 395                                 exit(1);
 396                         }
 397
 398                         break;
 399                 case GSS_SPNEGO_SERVER:
 400                 case SQUID_2_5_NTLMSSP:
 401                         if (!NT_STATUS_IS_OK(gensec_server_start(NULL, &state->gensec_state, NULL))) {
 402                                 exit(1);
 403                         }
 404                         break;
 405                 default:
 406                         abort();
 407                 }
 408
 409                 creds = cli_credentials_init(state->gensec_state);
 410                 cli_credentials_set_conf(creds);
 411                 if (opt_username) {
 412                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 413                 }
 414                 if (opt_domain) {
 415                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 416                 }
 417                 if (state->set_password) {
 418                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 419                 } else {
 420                         cli_credentials_set_password_callback(creds, get_password);
 421                         creds->priv_data = (void*)mux_id;
 422                 }
 423                 if (opt_workstation) {
 424                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 425                 }
 426
 427                 switch (stdio_helper_mode) {
 428                 case GSS_SPNEGO_SERVER:
 429                 case SQUID_2_5_NTLMSSP:
 430                         cli_credentials_set_machine_account(creds);
 431                         break;
 432                 default:
 433                         break;
 434                 }
 435
 436                 gensec_set_credentials(state->gensec_state, creds);
 437
 438                 switch (stdio_helper_mode) {
 439                 case GSS_SPNEGO_CLIENT:
 440                 case GSS_SPNEGO_SERVER:
 441                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 442                         if (!in.length) {
 443                                 first = True;
 444                         }
 445                         break;
 446                 case NTLMSSP_CLIENT_1:
 447                         if (!in.length) {
 448                                 first = True;
 449                         }
 450                         /* fall through */
 451                 case SQUID_2_5_NTLMSSP:
 452                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 453                         break;
 454                 default:
 455                         abort();
 456                 }
 457
 458                 if (!NT_STATUS_IS_OK(nt_status)) {
 459                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 460                         mux_printf(mux_id, "BH\n");
 461                         return;
 462                 }
 463
 464         }
 465
 466         /* update */
 467         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 468
 469         if (strncmp(buf, "PW ", 3) == 0) {
 470                 state->set_password = talloc_strndup(state,
 471                                                      (const char *)in.data,
 472                                                      in.length);
 473
 474                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 475                                              state->set_password,
 476                                              CRED_SPECIFIED);
 477                 mux_printf(mux_id, "OK\n");
 478                 data_blob_free(&in);
 479                 talloc_free(mem_ctx);
 480                 return;
 481         }
 482
 483         if (strncmp(buf, "UG", 2) == 0) {
 484                 int i;
 485                 char *grouplist = NULL;
 486                 struct auth_session_info *session_info;
 487
 488                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 489                 if (!NT_STATUS_IS_OK(nt_status)) {
 490                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 491                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 492                         data_blob_free(&in);
 493                         talloc_free(mem_ctx);
 494                         return;
 495                 }
 496
 497                 /* get the string onto the context */
 498                 grouplist = talloc_strdup(mem_ctx, "");
 499
 500                 for (i=0; i<session_info->security_token->num_sids; i++) {
 501                         struct security_token *token = session_info->security_token;
 502                         const char *sidstr = dom_sid_string(session_info,
 503                                                             token->sids[i]);
 504                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 505                 }
 506
 507                 mux_printf(mux_id, "GL %s\n", grouplist);
 508                 talloc_free(session_info);
 509                 data_blob_free(&in);
 510                 talloc_free(mem_ctx);
 511                 return;
 512         }
 513
 514         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 515
 516         /* don't leak 'bad password'/'no such user' info to the network client */
 517         nt_status = auth_nt_status_squash(nt_status);
 518
 519         if (out.length) {
 520                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 521         } else {
 522                 out_base64 = NULL;
 523         }
 524
 525         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 526                 reply_arg = "*";
 527                 if (first) {
 528                         reply_code = "YR";
 529                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 530                         reply_code = "KK";
 531                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 532                         reply_code = "TT";
 533                 } else {
 534                         abort();
 535                 }
 536
 537
 538         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 539                 reply_code = "BH";
 540                 reply_arg = nt_errstr(nt_status);
 541                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 542         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 543                 reply_code = "BH";
 544                 reply_arg = nt_errstr(nt_status);
 545                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 546         } else if (!NT_STATUS_IS_OK(nt_status)) {
 547                 reply_code = "NA";
 548                 reply_arg = nt_errstr(nt_status);
 549                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 550         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 551                 struct auth_session_info *session_info;
 552
 553                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 554                 if (!NT_STATUS_IS_OK(nt_status)) {
 555                         reply_code = "BH";
 556                         reply_arg = nt_errstr(nt_status);
 557                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 558                 } else {
 559
 560                         reply_code = "AF";
 561                         reply_arg = talloc_asprintf(state->gensec_state,
 562                                                     "%s%s%s", session_info->server_info->domain_name,
 563                                                     lp_winbind_separator(), session_info->server_info->account_name);
 564                         talloc_free(session_info);
 565                 }
 566         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 567                 reply_code = "AF";
 568                 reply_arg = out_base64;
 569         } else {
 570                 abort();
 571         }
 572
 573         switch (stdio_helper_mode) {
 574         case GSS_SPNEGO_SERVER:
 575                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 576                           out_base64 ? out_base64 : "*",
 577                           reply_arg ? reply_arg : "*");
 578                 break;
 579         default:
 580                 if (out_base64) {
 581                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 582                 } else if (reply_arg) {
 583                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 584                 } else {
 585                         mux_printf(mux_id, "%s\n", reply_code);
 586                 }
 587         }
 588
 589         talloc_free(mem_ctx);
 590         return;
 591 }
 592
 593 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 594                                          char *buf, int length, void **private,
 595                                          unsigned int mux_id, void **private2)
 596 {
 597         char *request, *parameter;
 598         static DATA_BLOB challenge;
 599         static DATA_BLOB lm_response;
 600         static DATA_BLOB nt_response;
 601         static char *full_username;
 602         static char *username;
 603         static char *domain;
 604         static char *plaintext_password;
 605         static BOOL ntlm_server_1_user_session_key;
 606         static BOOL ntlm_server_1_lm_session_key;
 607
 608         if (strequal(buf, ".")) {
 609                 if (!full_username && !username) {
 610                         mux_printf(mux_id, "Error: No username supplied!\n");
 611                 } else if (plaintext_password) {
 612                         /* handle this request as plaintext */
 613                         if (!full_username) {
 614                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 615                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 616                                         return;
 617                                 }
 618                         }
 619                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 620                                 mux_printf(mux_id, "Authenticated: Yes\n");
 621                         } else {
 622                                 mux_printf(mux_id, "Authenticated: No\n");
 623                         }
 624                 } else if (!lm_response.data && !nt_response.data) {
 625                         mux_printf(mux_id, "Error: No password supplied!\n");
 626                 } else if (!challenge.data) {
 627                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 628                 } else {
 629                         char *error_string = NULL;
 630                         DATA_BLOB lm_key;
 631                         DATA_BLOB user_session_key;
 632                         uint32_t flags = 0;
 633
 634                         if (full_username && !username) {
 635                                 fstring fstr_user;
 636                                 fstring fstr_domain;
 637
 638                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 639                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 640                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 641                                 }
 642                                 SAFE_FREE(username);
 643                                 SAFE_FREE(domain);
 644                                 username = smb_xstrdup(fstr_user);
 645                                 domain = smb_xstrdup(fstr_domain);
 646                         }
 647
 648                         if (!domain) {
 649                                 domain = smb_xstrdup(lp_workgroup());
 650                         }
 651
 652                         if (ntlm_server_1_lm_session_key)
 653                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 654
 655                         if (ntlm_server_1_user_session_key)
 656                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 657
 658                         if (!NT_STATUS_IS_OK(
 659                                     local_pw_check_specified(username,
 660                                                               domain,
 661                                                               lp_netbios_name(),
 662                                                               &challenge,
 663                                                               &lm_response,
 664                                                               &nt_response,
 665                                                               flags,
 666                                                               &lm_key,
 667                                                               &user_session_key,
 668                                                               &error_string,
 669                                                               NULL))) {
 670
 671                                 mux_printf(mux_id, "Authenticated: No\n");
 672                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 673                                 SAFE_FREE(error_string);
 674                         } else {
 675                                 static char zeros[16];
 676                                 char *hex_lm_key;
 677                                 char *hex_user_session_key;
 678
 679                                 mux_printf(mux_id, "Authenticated: Yes\n");
 680
 681                                 if (ntlm_server_1_lm_session_key
 682                                     && lm_key.length
 683                                     && (memcmp(zeros, lm_key.data,
 684                                                                 lm_key.length) != 0)) {
 685                                         hex_encode(lm_key.data,
 686                                                    lm_key.length,
 687                                                    &hex_lm_key);
 688                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 689                                         SAFE_FREE(hex_lm_key);
 690                                 }
 691
 692                                 if (ntlm_server_1_user_session_key
 693                                     && user_session_key.length
 694                                     && (memcmp(zeros, user_session_key.data,
 695                                                user_session_key.length) != 0)) {
 696                                         hex_encode(user_session_key.data,
 697                                                    user_session_key.length,
 698                                                    &hex_user_session_key);
 699                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 700                                         SAFE_FREE(hex_user_session_key);
 701                                 }
 702                         }
 703                 }
 704                 /* clear out the state */
 705                 challenge = data_blob(NULL, 0);
 706                 nt_response = data_blob(NULL, 0);
 707                 lm_response = data_blob(NULL, 0);
 708                 SAFE_FREE(full_username);
 709                 SAFE_FREE(username);
 710                 SAFE_FREE(domain);
 711                 SAFE_FREE(plaintext_password);
 712                 ntlm_server_1_user_session_key = False;
 713                 ntlm_server_1_lm_session_key = False;
 714                 mux_printf(mux_id, ".\n");
 715
 716                 return;
 717         }
 718
 719         request = buf;
 720
 721         /* Indicates a base64 encoded structure */
 722         parameter = strstr(request, ":: ");
 723         if (!parameter) {
 724                 parameter = strstr(request, ": ");
 725
 726                 if (!parameter) {
 727                         DEBUG(0, ("Parameter not found!\n"));
 728                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 729                         return;
 730                 }
 731
 732                 parameter[0] ='\0';
 733                 parameter++;
 734                 parameter[0] ='\0';
 735                 parameter++;
 736
 737         } else {
 738                 parameter[0] ='\0';
 739                 parameter++;
 740                 parameter[0] ='\0';
 741                 parameter++;
 742                 parameter[0] ='\0';
 743                 parameter++;
 744
 745                 base64_decode_inplace(parameter);
 746         }
 747
 748         if (strequal(request, "LANMAN-Challenge")) {
 749                 challenge = strhex_to_data_blob(parameter);
 750                 if (challenge.length != 8) {
 751                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 752                                   parameter,
 753                                   (int)challenge.length);
 754                         challenge = data_blob(NULL, 0);
 755                 }
 756         } else if (strequal(request, "NT-Response")) {
 757                 nt_response = strhex_to_data_blob(parameter);
 758                 if (nt_response.length < 24) {
 759                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 760                                   parameter,
 761                                   (int)nt_response.length);
 762                         nt_response = data_blob(NULL, 0);
 763                 }
 764         } else if (strequal(request, "LANMAN-Response")) {
 765                 lm_response = strhex_to_data_blob(parameter);
 766                 if (lm_response.length != 24) {
 767                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 768                                   parameter,
 769                                   (int)lm_response.length);
 770                         lm_response = data_blob(NULL, 0);
 771                 }
 772         } else if (strequal(request, "Password")) {
 773                 plaintext_password = smb_xstrdup(parameter);
 774         } else if (strequal(request, "NT-Domain")) {
 775                 domain = smb_xstrdup(parameter);
 776         } else if (strequal(request, "Username")) {
 777                 username = smb_xstrdup(parameter);
 778         } else if (strequal(request, "Full-Username")) {
 779                 full_username = smb_xstrdup(parameter);
 780         } else if (strequal(request, "Request-User-Session-Key")) {
 781                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 782         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 783                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 784         } else {
 785                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 786         }
 787 }
 788
 789 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 790                                  stdio_helper_function fn, void **private2)
 791 {
 792         char buf[SQUID_BUFFER_SIZE+1];
 793         unsigned int mux_id = 0;
 794         int length;
 795         char *c;
 796         static BOOL err;
 797         struct mux_private {
 798                 unsigned int max_mux;
 799                 void **private_pointers;
 800         };
 801
 802         static struct mux_private *mux_private;
 803         static void *normal_private;
 804         void **private;
 805
 806         /* this is not a typo - x_fgets doesn't work too well under squid */
 807         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 808                 if (ferror(stdin)) {
 809                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 810                                   strerror(ferror(stdin))));
 811
 812                         exit(1);    /* BIIG buffer */
 813                 }
 814                 exit(0);
 815         }
 816
 817         c=memchr(buf,'\n',sizeof(buf)-1);
 818         if (c) {
 819                 *c = '\0';
 820                 length = c-buf;
 821         } else {
 822                 err = 1;
 823                 return;
 824         }
 825         if (err) {
 826                 DEBUG(0, ("Oversized message\n"));
 827                 x_fprintf(x_stdout, "ERR\n");
 828                 err = 0;
 829                 return;
 830         }
 831
 832         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 833
 834         if (buf[0] == '\0') {
 835                 DEBUG(0, ("Invalid Request (empty)\n"));
 836                 x_fprintf(x_stdout, "ERR\n");
 837                 return;
 838         }
 839
 840         if (opt_multiplex) {
 841                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 842                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 843                         x_fprintf(x_stdout, "ERR\n");
 844                         return;
 845                 }
 846                 if (!mux_private) {
 847                         mux_private = talloc(NULL, struct mux_private);
 848                         mux_private->max_mux = 0;
 849                         mux_private->private_pointers = NULL;
 850                 }
 851
 852                 c=strchr(buf,' ');
 853                 if (!c) {
 854                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 855                         x_fprintf(x_stdout, "ERR\n");
 856                         return;
 857                 }
 858                 c++;
 859                 if (mux_id >= mux_private->max_mux) {
 860                         unsigned int prev_max = mux_private->max_mux;
 861                         mux_private->max_mux = mux_id + 1;
 862                         mux_private->private_pointers
 863                                 = talloc_realloc(mux_private,
 864                                                    mux_private->private_pointers,
 865                                                    void *, mux_private->max_mux);
 866                         memset(&mux_private->private_pointers[prev_max], '\0',
 867                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 868                 };
 869
 870                 private = &mux_private->private_pointers[mux_id];
 871         } else {
 872                 c = buf;
 873                 private = &normal_private;
 874         }
 875
 876         fn(helper_mode, c, length, private, mux_id, private2);
 877 }
 878
 879 static void squid_stream(enum stdio_helper_mode stdio_mode,
 880                          stdio_helper_function fn) {
 881         /* initialize FDescs */
 882         x_setbuf(x_stdout, NULL);
 883         x_setbuf(x_stderr, NULL);
 884         while(1) {
 885                 manage_squid_request(stdio_mode, fn, NULL);
 886         }
 887 }
 888
 889
 890 /* Main program */
 891
 892 enum {
 893         OPT_USERNAME = 1000,
 894         OPT_DOMAIN,
 895         OPT_WORKSTATION,
 896         OPT_CHALLENGE,
 897         OPT_RESPONSE,
 898         OPT_LM,
 899         OPT_NT,
 900         OPT_PASSWORD,
 901         OPT_LM_KEY,
 902         OPT_USER_SESSION_KEY,
 903         OPT_DIAGNOSTICS,
 904         OPT_REQUIRE_MEMBERSHIP,
 905         OPT_MULTIPLEX,
 906 };
 907
 908 int main(int argc, const char **argv)
 909 {
 910         static const char *helper_protocol;
 911         int opt;
 912
 913         poptContext pc;
 914
 915         /* NOTE: DO NOT change this interface without considering the implications!
 916            This is an external interface, which other programs will use to interact
 917            with this helper.
 918         */
 919
 920         /* We do not use single-letter command abbreviations, because they harm future
 921            interface stability. */
 922
 923         struct poptOption long_options[] = {
 924                 POPT_AUTOHELP
 925                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
 926                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
 927                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
 928                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
 929                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
 930                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
 931                 POPT_COMMON_SAMBA
 932                 POPT_COMMON_VERSION
 933                 POPT_TABLEEND
 934         };
 935
 936         /* Samba client initialisation */
 937
 938         setup_logging(NULL, DEBUG_STDERR);
 939
 940         /* Parse options */
 941
 942         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
 943
 944         /* Parse command line options */
 945
 946         if (argc == 1) {
 947                 poptPrintHelp(pc, stderr, 0);
 948                 return 1;
 949         }
 950
 951         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
 952                             POPT_CONTEXT_KEEP_FIRST);
 953
 954         while((opt = poptGetNextOpt(pc)) != -1) {
 955                 if (opt < -1) {
 956                         break;
 957                 }
 958         }
 959         if (opt < -1) {
 960                 fprintf(stderr, "%s: %s\n",
 961                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 962                         poptStrerror(opt));
 963                 return 1;
 964         }
 965
 966         gensec_init();
 967
 968         if (opt_domain == NULL) {
 969                 opt_domain = lp_workgroup();
 970         }
 971
 972         if (helper_protocol) {
 973                 int i;
 974                 for (i=0; i<NUM_HELPER_MODES; i++) {
 975                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
 976                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
 977                                 exit(0);
 978                         }
 979                 }
 980                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
 981
 982                 for (i=0; i<NUM_HELPER_MODES; i++) {
 983                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
 984                 }
 985
 986                 exit(1);
 987         }
 988
 989         if (!opt_username) {
 990                 x_fprintf(x_stderr, "username must be specified!\n\n");
 991                 poptPrintHelp(pc, stderr, 0);
 992                 exit(1);
 993         }
 994
 995         if (opt_workstation == NULL) {
 996                 opt_workstation = lp_netbios_name();
 997         }
 998
 999         if (!opt_password) {
1000                 opt_password = getpass("password: ");
1001         }
1002
1003         {
1004                 char *user;
1005
1006                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
1007                 if (!check_plaintext_auth(user, opt_password, True)) {
1008                         return 1;
1009                 }
1010         }
1011
1012         /* Exit code */
1013
1014         poptFreeContext(pc);
1015         return 0;
1016 }