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 "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 #include "lib/events/events.h"
  35 #include "lib/messaging/messaging.h"
  36 #include "lib/messaging/irpc.h"
  37 #include "auth/ntlmssp/ntlmssp.h"
  38
  39 #define SQUID_BUFFER_SIZE 2010
  40
  41 enum stdio_helper_mode {
  42         SQUID_2_4_BASIC,
  43         SQUID_2_5_BASIC,
  44         SQUID_2_5_NTLMSSP,
  45         NTLMSSP_CLIENT_1,
  46         GSS_SPNEGO_CLIENT,
  47         GSS_SPNEGO_SERVER,
  48         NTLM_SERVER_1,
  49         NUM_HELPER_MODES
  50 };
  51
  52 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  53 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  54
  55
  56 typedef void (*stdio_helper_function)(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_squid_basic_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_gensec_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_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  69                                           char *buf, int length, void **private,
  70                                           unsigned int mux_id, void **private2);
  71
  72 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  73                                  stdio_helper_function fn, void **private2);
  74
  75 static const struct {
  76         enum stdio_helper_mode mode;
  77         const char *name;
  78         stdio_helper_function fn;
  79 } stdio_helper_protocols[] = {
  80         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  81         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  82         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  83         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  84         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  85         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  86         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  87         { NUM_HELPER_MODES, NULL, NULL}
  88 };
  89
  90 extern int winbindd_fd;
  91
  92 static const char *opt_username;
  93 static const char *opt_domain;
  94 static const char *opt_workstation;
  95 static const char *opt_password;
  96 static int opt_multiplex;
  97 static int use_cached_creds;
  98
  99
 100 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 101
 102 static void mux_printf(unsigned int mux_id, const char *format, ...)
 103 {
 104         va_list ap;
 105
 106         if (opt_multiplex) {
 107                 x_fprintf(x_stdout, "%d ", mux_id);
 108         }
 109
 110         va_start(ap, format);
 111         x_vfprintf(x_stdout, format, ap);
 112         va_end(ap);
 113 }
 114
 115
 116
 117 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 118    form DOMAIN/user into a domain and a user */
 119
 120 static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 121                                         fstring user)
 122 {
 123
 124         char *p = strchr(domuser,*lp_winbind_separator());
 125
 126         if (!p) {
 127                 return False;
 128         }
 129
 130         fstrcpy(user, p+1);
 131         fstrcpy(domain, domuser);
 132         domain[PTR_DIFF(p, domuser)] = 0;
 133
 134         return True;
 135 }
 136
 137 /**
 138  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 139  **/
 140 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 141 {
 142         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 143         ret.length = ldb_base64_decode((char *)ret.data);
 144         return ret;
 145 }
 146
 147 /**
 148  * Encode a base64 string into a talloc()ed string caller to free.
 149  **/
 150 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 151 {
 152         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 153 }
 154
 155 /**
 156  * Decode a base64 string in-place - wrapper for the above
 157  **/
 158 static void base64_decode_inplace(char *s)
 159 {
 160         ldb_base64_decode(s);
 161 }
 162
 163
 164
 165 /* Authenticate a user with a plaintext password */
 166
 167 static BOOL check_plaintext_auth(const char *user, const char *pass,
 168                                  BOOL stdout_diagnostics)
 169 {
 170         return (strcmp(pass, opt_password) == 0);
 171 }
 172
 173 /* authenticate a user with an encrypted username/password */
 174
 175 static NTSTATUS local_pw_check_specified(const char *username,
 176                                          const char *domain,
 177                                          const char *workstation,
 178                                          const DATA_BLOB *challenge,
 179                                          const DATA_BLOB *lm_response,
 180                                          const DATA_BLOB *nt_response,
 181                                          uint32_t flags,
 182                                          DATA_BLOB *lm_session_key,
 183                                          DATA_BLOB *user_session_key,
 184                                          char **error_string,
 185                                          char **unix_name)
 186 {
 187         NTSTATUS nt_status;
 188         struct samr_Password lm_pw, nt_pw;
 189         struct samr_Password *lm_pwd, *nt_pwd;
 190         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 191         if (!mem_ctx) {
 192                 nt_status = NT_STATUS_NO_MEMORY;
 193         } else {
 194
 195                 E_md4hash(opt_password, nt_pw.hash);
 196                 if (E_deshash(opt_password, lm_pw.hash)) {
 197                         lm_pwd = &lm_pw;
 198                 } else {
 199                         lm_pwd = NULL;
 200                 }
 201                 nt_pwd = &nt_pw;
 202
 203
 204                 nt_status = ntlm_password_check(mem_ctx,
 205                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 206                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 207                                                 challenge,
 208                                                 lm_response,
 209                                                 nt_response,
 210                                                 username,
 211                                                 username,
 212                                                 domain,
 213                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 214
 215                 if (NT_STATUS_IS_OK(nt_status)) {
 216                         if (unix_name) {
 217                                 asprintf(unix_name,
 218                                          "%s%c%s", domain,
 219                                          *lp_winbind_separator(),
 220                                          username);
 221                         }
 222                 } else {
 223                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 224                                   domain, username, workstation,
 225                                   nt_errstr(nt_status)));
 226                 }
 227                 talloc_free(mem_ctx);
 228         }
 229         if (error_string) {
 230                 *error_string = strdup(nt_errstr(nt_status));
 231         }
 232         return nt_status;
 233
 234
 235 }
 236
 237 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 238                                        char *buf, int length, void **private,
 239                                        unsigned int mux_id, void **private2)
 240 {
 241         char *user, *pass;
 242         user=buf;
 243
 244         pass=memchr(buf,' ',length);
 245         if (!pass) {
 246                 DEBUG(2, ("Password not found. Denying access\n"));
 247                 mux_printf(mux_id, "ERR\n");
 248                 return;
 249         }
 250         *pass='\0';
 251         pass++;
 252
 253         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 254                 rfc1738_unescape(user);
 255                 rfc1738_unescape(pass);
 256         }
 257
 258         if (check_plaintext_auth(user, pass, False)) {
 259                 mux_printf(mux_id, "OK\n");
 260         } else {
 261                 mux_printf(mux_id, "ERR\n");
 262         }
 263 }
 264
 265 /* This is a bit hairy, but the basic idea is to do a password callback
 266    to the calling application.  The callback comes from within gensec */
 267
 268 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 269                                          char *buf, int length, void **private,
 270                                          unsigned int mux_id, void **password)
 271 {
 272         DATA_BLOB in;
 273         if (strlen(buf) < 2) {
 274                 DEBUG(1, ("query [%s] invalid", buf));
 275                 mux_printf(mux_id, "BH\n");
 276                 return;
 277         }
 278
 279         if (strlen(buf) > 3) {
 280                 in = base64_decode_data_blob(NULL, buf + 3);
 281         } else {
 282                 in = data_blob(NULL, 0);
 283         }
 284
 285         if (strncmp(buf, "PW ", 3) == 0) {
 286
 287                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 288                                            (const char *)in.data, in.length);
 289
 290                 if (*password == NULL) {
 291                         DEBUG(1, ("Out of memory\n"));
 292                         mux_printf(mux_id, "BH\n");
 293                         data_blob_free(&in);
 294                         return;
 295                 }
 296
 297                 mux_printf(mux_id, "OK\n");
 298                 data_blob_free(&in);
 299                 return;
 300         }
 301         DEBUG(1, ("Asked for (and expected) a password\n"));
 302         mux_printf(mux_id, "BH\n");
 303         data_blob_free(&in);
 304 }
 305
 306 /**
 307  * Callback for password credentails.  This is not async, and when
 308  * GENSEC and the credentails code is made async, it will look rather
 309  * different.
 310  */
 311
 312 static const char *get_password(struct cli_credentials *credentials)
 313 {
 314         char *password = NULL;
 315
 316         /* Ask for a password */
 317         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 318         credentials->priv_data = NULL;
 319
 320         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 321         return password;
 322 }
 323
 324 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 325 {
 326         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 327                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 328                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 329         }
 330         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 331                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 332                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 333         }
 334         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 335                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 336                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 337         }
 338 }
 339
 340 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 341                                   char *buf, int length, void **private,
 342                                   unsigned int mux_id, void **private2)
 343 {
 344         DATA_BLOB in;
 345         DATA_BLOB out = data_blob(NULL, 0);
 346         char *out_base64 = NULL;
 347         const char *reply_arg = NULL;
 348         struct gensec_ntlm_state {
 349                 struct gensec_security *gensec_state;
 350                 const char *set_password;
 351         };
 352         struct gensec_ntlm_state *state;
 353         struct event_context *ev;
 354         struct messaging_context *msg;
 355
 356         NTSTATUS nt_status;
 357         BOOL first = False;
 358         const char *reply_code;
 359         struct cli_credentials *creds;
 360
 361         static char *want_feature_list = NULL;
 362         static DATA_BLOB session_key;
 363
 364         TALLOC_CTX *mem_ctx;
 365
 366         if (*private) {
 367                 state = *private;
 368         } else {
 369                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 370                 if (!state) {
 371                         mux_printf(mux_id, "BH No Memory\n");
 372                         exit(1);
 373                 }
 374                 *private = state;
 375                 if (opt_password) {
 376                         state->set_password = opt_password;
 377                 }
 378         }
 379
 380         if (strlen(buf) < 2) {
 381                 DEBUG(1, ("query [%s] invalid", buf));
 382                 mux_printf(mux_id, "BH\n");
 383                 return;
 384         }
 385
 386         if (strlen(buf) > 3) {
 387                 if(strncmp(buf, "SF ", 3) == 0) {
 388                         DEBUG(10, ("Setting flags to negotiate\n"));
 389                         talloc_free(want_feature_list);
 390                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 391                         mux_printf(mux_id, "OK\n");
 392                         return;
 393                 }
 394                 in = base64_decode_data_blob(NULL, buf + 3);
 395         } else {
 396                 in = data_blob(NULL, 0);
 397         }
 398
 399         if (strncmp(buf, "YR", 2) == 0) {
 400                 if (state->gensec_state) {
 401                         talloc_free(state->gensec_state);
 402                         state->gensec_state = NULL;
 403                 }
 404         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 405                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 406                 mux_printf(mux_id, "BH\n");
 407                 data_blob_free(&in);
 408                 return;
 409         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 410                     (strncmp(buf, "KK ", 3) != 0) &&
 411                     (strncmp(buf, "AF ", 3) != 0) &&
 412                     (strncmp(buf, "NA ", 3) != 0) &&
 413                     (strncmp(buf, "UG", 2) != 0) &&
 414                     (strncmp(buf, "PW ", 3) != 0) &&
 415                     (strncmp(buf, "GK", 2) != 0) &&
 416                     (strncmp(buf, "GF", 2) != 0)) {
 417                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 418                 mux_printf(mux_id, "BH\n");
 419                 data_blob_free(&in);
 420                 return;
 421         }
 422
 423         /* setup gensec */
 424         if (!(state->gensec_state)) {
 425                 switch (stdio_helper_mode) {
 426                 case GSS_SPNEGO_CLIENT:
 427                 case NTLMSSP_CLIENT_1:
 428                         /* setup the client side */
 429
 430                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 431                         if (!NT_STATUS_IS_OK(nt_status)) {
 432                                 exit(1);
 433                         }
 434
 435                         break;
 436                 case GSS_SPNEGO_SERVER:
 437                 case SQUID_2_5_NTLMSSP:
 438                         ev = event_context_init(state);
 439                         if (!ev) {
 440                                 exit(1);
 441                         }
 442                         msg = messaging_client_init(state, ev);
 443                         if (!msg) {
 444                                 exit(1);
 445                         }
 446                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev, msg, &state->gensec_state))) {
 447                                 exit(1);
 448                         }
 449                         break;
 450                 default:
 451                         abort();
 452                 }
 453
 454                 creds = cli_credentials_init(state->gensec_state);
 455                 cli_credentials_set_conf(creds);
 456                 if (opt_username) {
 457                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 458                 }
 459                 if (opt_domain) {
 460                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 461                 }
 462                 if (state->set_password) {
 463                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 464                 } else {
 465                         cli_credentials_set_password_callback(creds, get_password);
 466                         creds->priv_data = (void*)mux_id;
 467                 }
 468                 if (opt_workstation) {
 469                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 470                 }
 471
 472                 switch (stdio_helper_mode) {
 473                 case GSS_SPNEGO_SERVER:
 474                 case SQUID_2_5_NTLMSSP:
 475                         cli_credentials_set_machine_account(creds);
 476                         break;
 477                 default:
 478                         break;
 479                 }
 480
 481                 gensec_set_credentials(state->gensec_state, creds);
 482                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 483
 484                 switch (stdio_helper_mode) {
 485                 case GSS_SPNEGO_CLIENT:
 486                 case GSS_SPNEGO_SERVER:
 487                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 488                         if (!in.length) {
 489                                 first = True;
 490                         }
 491                         break;
 492                 case NTLMSSP_CLIENT_1:
 493                         if (!in.length) {
 494                                 first = True;
 495                         }
 496                         /* fall through */
 497                 case SQUID_2_5_NTLMSSP:
 498                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 499                         break;
 500                 default:
 501                         abort();
 502                 }
 503
 504                 if (!NT_STATUS_IS_OK(nt_status)) {
 505                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 506                         mux_printf(mux_id, "BH\n");
 507                         return;
 508                 }
 509
 510         }
 511
 512         /* update */
 513         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 514
 515         if (strncmp(buf, "PW ", 3) == 0) {
 516                 state->set_password = talloc_strndup(state,
 517                                                      (const char *)in.data,
 518                                                      in.length);
 519
 520                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 521                                              state->set_password,
 522                                              CRED_SPECIFIED);
 523                 mux_printf(mux_id, "OK\n");
 524                 data_blob_free(&in);
 525                 talloc_free(mem_ctx);
 526                 return;
 527         }
 528
 529         if (strncmp(buf, "UG", 2) == 0) {
 530                 int i;
 531                 char *grouplist = NULL;
 532                 struct auth_session_info *session_info;
 533
 534                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 535                 if (!NT_STATUS_IS_OK(nt_status)) {
 536                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 537                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 538                         data_blob_free(&in);
 539                         talloc_free(mem_ctx);
 540                         return;
 541                 }
 542
 543                 /* get the string onto the context */
 544                 grouplist = talloc_strdup(mem_ctx, "");
 545
 546                 for (i=0; i<session_info->security_token->num_sids; i++) {
 547                         struct security_token *token = session_info->security_token;
 548                         const char *sidstr = dom_sid_string(session_info,
 549                                                             token->sids[i]);
 550                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 551                 }
 552
 553                 mux_printf(mux_id, "GL %s\n", grouplist);
 554                 talloc_free(session_info);
 555                 data_blob_free(&in);
 556                 talloc_free(mem_ctx);
 557                 return;
 558         }
 559
 560         if (strncmp(buf, "GK", 2) == 0) {
 561                 char *base64_key;
 562                 DEBUG(10, ("Requested session key\n"));
 563                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 564                 if(!NT_STATUS_IS_OK(nt_status)) {
 565                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 566                         mux_printf(mux_id, "BH No session key\n");
 567                         talloc_free(mem_ctx);
 568                         return;
 569                 } else {
 570                         base64_key = base64_encode_data_blob(state, session_key);
 571                         mux_printf(mux_id, "GK %s\n", base64_key);
 572                         talloc_free(base64_key);
 573                 }
 574                 talloc_free(mem_ctx);
 575                 return;
 576         }
 577
 578         if (strncmp(buf, "GF", 2) == 0) {
 579                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 580                 uint32_t neg_flags;
 581
 582                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 583                                 struct gensec_ntlmssp_state);
 584                 neg_flags = gensec_ntlmssp_state->neg_flags;
 585
 586                 DEBUG(10, ("Requested negotiated feature flags\n"));
 587                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 588                 return;
 589         }
 590
 591         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 592
 593         /* don't leak 'bad password'/'no such user' info to the network client */
 594         nt_status = auth_nt_status_squash(nt_status);
 595
 596         if (out.length) {
 597                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 598         } else {
 599                 out_base64 = NULL;
 600         }
 601
 602         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 603                 reply_arg = "*";
 604                 if (first) {
 605                         reply_code = "YR";
 606                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 607                         reply_code = "KK";
 608                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 609                         reply_code = "TT";
 610                 } else {
 611                         abort();
 612                 }
 613
 614
 615         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 616                 reply_code = "BH";
 617                 reply_arg = nt_errstr(nt_status);
 618                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 619         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 620                 reply_code = "BH";
 621                 reply_arg = nt_errstr(nt_status);
 622                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 623         } else if (!NT_STATUS_IS_OK(nt_status)) {
 624                 reply_code = "NA";
 625                 reply_arg = nt_errstr(nt_status);
 626                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 627         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 628                 struct auth_session_info *session_info;
 629
 630                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 631                 if (!NT_STATUS_IS_OK(nt_status)) {
 632                         reply_code = "BH";
 633                         reply_arg = nt_errstr(nt_status);
 634                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 635                 } else {
 636
 637                         reply_code = "AF";
 638                         reply_arg = talloc_asprintf(state->gensec_state,
 639                                                     "%s%s%s", session_info->server_info->domain_name,
 640                                                     lp_winbind_separator(), session_info->server_info->account_name);
 641                         talloc_free(session_info);
 642                 }
 643         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 644                 reply_code = "AF";
 645                 reply_arg = out_base64;
 646         } else {
 647                 abort();
 648         }
 649
 650         switch (stdio_helper_mode) {
 651         case GSS_SPNEGO_SERVER:
 652                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 653                           out_base64 ? out_base64 : "*",
 654                           reply_arg ? reply_arg : "*");
 655                 break;
 656         default:
 657                 if (out_base64) {
 658                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 659                 } else if (reply_arg) {
 660                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 661                 } else {
 662                         mux_printf(mux_id, "%s\n", reply_code);
 663                 }
 664         }
 665
 666         talloc_free(mem_ctx);
 667         return;
 668 }
 669
 670 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 671                                          char *buf, int length, void **private,
 672                                          unsigned int mux_id, void **private2)
 673 {
 674         char *request, *parameter;
 675         static DATA_BLOB challenge;
 676         static DATA_BLOB lm_response;
 677         static DATA_BLOB nt_response;
 678         static char *full_username;
 679         static char *username;
 680         static char *domain;
 681         static char *plaintext_password;
 682         static BOOL ntlm_server_1_user_session_key;
 683         static BOOL ntlm_server_1_lm_session_key;
 684
 685         if (strequal(buf, ".")) {
 686                 if (!full_username && !username) {
 687                         mux_printf(mux_id, "Error: No username supplied!\n");
 688                 } else if (plaintext_password) {
 689                         /* handle this request as plaintext */
 690                         if (!full_username) {
 691                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 692                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 693                                         return;
 694                                 }
 695                         }
 696                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 697                                 mux_printf(mux_id, "Authenticated: Yes\n");
 698                         } else {
 699                                 mux_printf(mux_id, "Authenticated: No\n");
 700                         }
 701                 } else if (!lm_response.data && !nt_response.data) {
 702                         mux_printf(mux_id, "Error: No password supplied!\n");
 703                 } else if (!challenge.data) {
 704                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 705                 } else {
 706                         char *error_string = NULL;
 707                         DATA_BLOB lm_key;
 708                         DATA_BLOB user_session_key;
 709                         uint32_t flags = 0;
 710
 711                         if (full_username && !username) {
 712                                 fstring fstr_user;
 713                                 fstring fstr_domain;
 714
 715                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 716                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 717                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 718                                 }
 719                                 SAFE_FREE(username);
 720                                 SAFE_FREE(domain);
 721                                 username = smb_xstrdup(fstr_user);
 722                                 domain = smb_xstrdup(fstr_domain);
 723                         }
 724
 725                         if (!domain) {
 726                                 domain = smb_xstrdup(lp_workgroup());
 727                         }
 728
 729                         if (ntlm_server_1_lm_session_key)
 730                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 731
 732                         if (ntlm_server_1_user_session_key)
 733                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 734
 735                         if (!NT_STATUS_IS_OK(
 736                                     local_pw_check_specified(username,
 737                                                               domain,
 738                                                               lp_netbios_name(),
 739                                                               &challenge,
 740                                                               &lm_response,
 741                                                               &nt_response,
 742                                                               flags,
 743                                                               &lm_key,
 744                                                               &user_session_key,
 745                                                               &error_string,
 746                                                               NULL))) {
 747
 748                                 mux_printf(mux_id, "Authenticated: No\n");
 749                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 750                                 SAFE_FREE(error_string);
 751                         } else {
 752                                 static char zeros[16];
 753                                 char *hex_lm_key;
 754                                 char *hex_user_session_key;
 755
 756                                 mux_printf(mux_id, "Authenticated: Yes\n");
 757
 758                                 if (ntlm_server_1_lm_session_key
 759                                     && lm_key.length
 760                                     && (memcmp(zeros, lm_key.data,
 761                                                                 lm_key.length) != 0)) {
 762                                         hex_encode(lm_key.data,
 763                                                    lm_key.length,
 764                                                    &hex_lm_key);
 765                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 766                                         SAFE_FREE(hex_lm_key);
 767                                 }
 768
 769                                 if (ntlm_server_1_user_session_key
 770                                     && user_session_key.length
 771                                     && (memcmp(zeros, user_session_key.data,
 772                                                user_session_key.length) != 0)) {
 773                                         hex_encode(user_session_key.data,
 774                                                    user_session_key.length,
 775                                                    &hex_user_session_key);
 776                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 777                                         SAFE_FREE(hex_user_session_key);
 778                                 }
 779                         }
 780                 }
 781                 /* clear out the state */
 782                 challenge = data_blob(NULL, 0);
 783                 nt_response = data_blob(NULL, 0);
 784                 lm_response = data_blob(NULL, 0);
 785                 SAFE_FREE(full_username);
 786                 SAFE_FREE(username);
 787                 SAFE_FREE(domain);
 788                 SAFE_FREE(plaintext_password);
 789                 ntlm_server_1_user_session_key = False;
 790                 ntlm_server_1_lm_session_key = False;
 791                 mux_printf(mux_id, ".\n");
 792
 793                 return;
 794         }
 795
 796         request = buf;
 797
 798         /* Indicates a base64 encoded structure */
 799         parameter = strstr(request, ":: ");
 800         if (!parameter) {
 801                 parameter = strstr(request, ": ");
 802
 803                 if (!parameter) {
 804                         DEBUG(0, ("Parameter not found!\n"));
 805                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 806                         return;
 807                 }
 808
 809                 parameter[0] ='\0';
 810                 parameter++;
 811                 parameter[0] ='\0';
 812                 parameter++;
 813
 814         } else {
 815                 parameter[0] ='\0';
 816                 parameter++;
 817                 parameter[0] ='\0';
 818                 parameter++;
 819                 parameter[0] ='\0';
 820                 parameter++;
 821
 822                 base64_decode_inplace(parameter);
 823         }
 824
 825         if (strequal(request, "LANMAN-Challenge")) {
 826                 challenge = strhex_to_data_blob(parameter);
 827                 if (challenge.length != 8) {
 828                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 829                                   parameter,
 830                                   (int)challenge.length);
 831                         challenge = data_blob(NULL, 0);
 832                 }
 833         } else if (strequal(request, "NT-Response")) {
 834                 nt_response = strhex_to_data_blob(parameter);
 835                 if (nt_response.length < 24) {
 836                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 837                                   parameter,
 838                                   (int)nt_response.length);
 839                         nt_response = data_blob(NULL, 0);
 840                 }
 841         } else if (strequal(request, "LANMAN-Response")) {
 842                 lm_response = strhex_to_data_blob(parameter);
 843                 if (lm_response.length != 24) {
 844                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 845                                   parameter,
 846                                   (int)lm_response.length);
 847                         lm_response = data_blob(NULL, 0);
 848                 }
 849         } else if (strequal(request, "Password")) {
 850                 plaintext_password = smb_xstrdup(parameter);
 851         } else if (strequal(request, "NT-Domain")) {
 852                 domain = smb_xstrdup(parameter);
 853         } else if (strequal(request, "Username")) {
 854                 username = smb_xstrdup(parameter);
 855         } else if (strequal(request, "Full-Username")) {
 856                 full_username = smb_xstrdup(parameter);
 857         } else if (strequal(request, "Request-User-Session-Key")) {
 858                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 859         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 860                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 861         } else {
 862                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 863         }
 864 }
 865
 866 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 867                                  stdio_helper_function fn, void **private2)
 868 {
 869         char buf[SQUID_BUFFER_SIZE+1];
 870         unsigned int mux_id = 0;
 871         int length;
 872         char *c;
 873         static BOOL err;
 874         struct mux_private {
 875                 unsigned int max_mux;
 876                 void **private_pointers;
 877         };
 878
 879         static struct mux_private *mux_private;
 880         static void *normal_private;
 881         void **private;
 882
 883         /* this is not a typo - x_fgets doesn't work too well under squid */
 884         if (fgets(buf, sizeof(buf)-1, stdin) == NULL) {
 885                 if (ferror(stdin)) {
 886                         DEBUG(1, ("fgets() failed! dying..... errno=%d (%s)\n", ferror(stdin),
 887                                   strerror(ferror(stdin))));
 888
 889                         exit(1);    /* BIIG buffer */
 890                 }
 891                 exit(0);
 892         }
 893
 894         c=memchr(buf,'\n',sizeof(buf)-1);
 895         if (c) {
 896                 *c = '\0';
 897                 length = c-buf;
 898         } else {
 899                 err = 1;
 900                 return;
 901         }
 902         if (err) {
 903                 DEBUG(0, ("Oversized message\n"));
 904                 x_fprintf(x_stdout, "ERR\n");
 905                 err = 0;
 906                 return;
 907         }
 908
 909         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 910
 911         if (buf[0] == '\0') {
 912                 DEBUG(0, ("Invalid Request (empty)\n"));
 913                 x_fprintf(x_stdout, "ERR\n");
 914                 return;
 915         }
 916
 917         if (opt_multiplex) {
 918                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 919                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 920                         x_fprintf(x_stdout, "ERR\n");
 921                         return;
 922                 }
 923                 if (!mux_private) {
 924                         mux_private = talloc(NULL, struct mux_private);
 925                         mux_private->max_mux = 0;
 926                         mux_private->private_pointers = NULL;
 927                 }
 928
 929                 c=strchr(buf,' ');
 930                 if (!c) {
 931                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 932                         x_fprintf(x_stdout, "ERR\n");
 933                         return;
 934                 }
 935                 c++;
 936                 if (mux_id >= mux_private->max_mux) {
 937                         unsigned int prev_max = mux_private->max_mux;
 938                         mux_private->max_mux = mux_id + 1;
 939                         mux_private->private_pointers
 940                                 = talloc_realloc(mux_private,
 941                                                    mux_private->private_pointers,
 942                                                    void *, mux_private->max_mux);
 943                         memset(&mux_private->private_pointers[prev_max], '\0',
 944                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 945                 };
 946
 947                 private = &mux_private->private_pointers[mux_id];
 948         } else {
 949                 c = buf;
 950                 private = &normal_private;
 951         }
 952
 953         fn(helper_mode, c, length, private, mux_id, private2);
 954 }
 955
 956 static void squid_stream(enum stdio_helper_mode stdio_mode,
 957                          stdio_helper_function fn) {
 958         /* initialize FDescs */
 959         x_setbuf(x_stdout, NULL);
 960         x_setbuf(x_stderr, NULL);
 961         while(1) {
 962                 manage_squid_request(stdio_mode, fn, NULL);
 963         }
 964 }
 965
 966
 967 /* Main program */
 968
 969 enum {
 970         OPT_USERNAME = 1000,
 971         OPT_DOMAIN,
 972         OPT_WORKSTATION,
 973         OPT_CHALLENGE,
 974         OPT_RESPONSE,
 975         OPT_LM,
 976         OPT_NT,
 977         OPT_PASSWORD,
 978         OPT_LM_KEY,
 979         OPT_USER_SESSION_KEY,
 980         OPT_DIAGNOSTICS,
 981         OPT_REQUIRE_MEMBERSHIP,
 982         OPT_MULTIPLEX,
 983         OPT_USE_CACHED_CREDS,
 984 };
 985
 986 int main(int argc, const char **argv)
 987 {
 988         static const char *helper_protocol;
 989         int opt;
 990
 991         poptContext pc;
 992
 993         /* NOTE: DO NOT change this interface without considering the implications!
 994            This is an external interface, which other programs will use to interact
 995            with this helper.
 996         */
 997
 998         /* We do not use single-letter command abbreviations, because they harm future
 999            interface stability. */
1000
1001         struct poptOption long_options[] = {
1002                 POPT_AUTOHELP
1003                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1004                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1005                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1006                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1007                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1008                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1009                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1010                 POPT_COMMON_SAMBA
1011                 POPT_COMMON_VERSION
1012                 { NULL }
1013         };
1014
1015         /* Samba client initialisation */
1016
1017         setup_logging(NULL, DEBUG_STDERR);
1018
1019         /* Parse options */
1020
1021         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1022
1023         /* Parse command line options */
1024
1025         if (argc == 1) {
1026                 poptPrintHelp(pc, stderr, 0);
1027                 return 1;
1028         }
1029
1030         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1031                             POPT_CONTEXT_KEEP_FIRST);
1032
1033         while((opt = poptGetNextOpt(pc)) != -1) {
1034                 if (opt < -1) {
1035                         break;
1036                 }
1037         }
1038         if (opt < -1) {
1039                 fprintf(stderr, "%s: %s\n",
1040                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1041                         poptStrerror(opt));
1042                 return 1;
1043         }
1044
1045         gensec_init();
1046
1047         if (opt_domain == NULL) {
1048                 opt_domain = lp_workgroup();
1049         }
1050
1051         if (helper_protocol) {
1052                 int i;
1053                 for (i=0; i<NUM_HELPER_MODES; i++) {
1054                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1055                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1056                                 exit(0);
1057                         }
1058                 }
1059                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1060
1061                 for (i=0; i<NUM_HELPER_MODES; i++) {
1062                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1063                 }
1064
1065                 exit(1);
1066         }
1067
1068         if (!opt_username) {
1069                 x_fprintf(x_stderr, "username must be specified!\n\n");
1070                 poptPrintHelp(pc, stderr, 0);
1071                 exit(1);
1072         }
1073
1074         if (opt_workstation == NULL) {
1075                 opt_workstation = lp_netbios_name();
1076         }
1077
1078         if (!opt_password) {
1079                 opt_password = getpass("password: ");
1080         }
1081
1082         {
1083                 char *user;
1084
1085                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(), opt_username);
1086                 if (!check_plaintext_auth(user, opt_password, True)) {
1087                         return 1;
1088                 }
1089         }
1090
1091         /* Exit code */
1092
1093         poptFreeContext(pc);
1094         return 0;
1095 }