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 3 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, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/filesys.h"
  26 #include "lib/cmdline/popt_common.h"
  27 #include "lib/ldb/include/ldb.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "auth/gensec/gensec.h"
  30 #include "auth/auth.h"
  31 #include "librpc/gen_ndr/ndr_netlogon.h"
  32 #include "auth/auth_sam.h"
  33 #include "pstring.h"
  34 #include "libcli/auth/libcli_auth.h"
  35 #include "libcli/security/security.h"
  36 #include "lib/events/events.h"
  37 #include "lib/messaging/messaging.h"
  38 #include "lib/messaging/irpc.h"
  39 #include "auth/ntlmssp/ntlmssp.h"
  40 #include "param/param.h"
  41
  42 #define INITIAL_BUFFER_SIZE 300
  43 #define MAX_BUFFER_SIZE 63000
  44
  45 enum stdio_helper_mode {
  46         SQUID_2_4_BASIC,
  47         SQUID_2_5_BASIC,
  48         SQUID_2_5_NTLMSSP,
  49         NTLMSSP_CLIENT_1,
  50         GSS_SPNEGO_CLIENT,
  51         GSS_SPNEGO_SERVER,
  52         NTLM_SERVER_1,
  53         NUM_HELPER_MODES
  54 };
  55
  56 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  57 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  58
  59
  60 typedef void (*stdio_helper_function)(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_squid_basic_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_gensec_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_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  73                                           char *buf, int length, void **private,
  74                                           unsigned int mux_id, void **private2);
  75
  76 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  77                                  stdio_helper_function fn, void **private2);
  78
  79 static const struct {
  80         enum stdio_helper_mode mode;
  81         const char *name;
  82         stdio_helper_function fn;
  83 } stdio_helper_protocols[] = {
  84         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  85         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  86         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  87         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  88         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  89         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  90         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  91         { NUM_HELPER_MODES, NULL, NULL}
  92 };
  93
  94 extern int winbindd_fd;
  95
  96 static const char *opt_username;
  97 static const char *opt_domain;
  98 static const char *opt_workstation;
  99 static const char *opt_password;
 100 static int opt_multiplex;
 101 static int use_cached_creds;
 102
 103
 104 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 105
 106 static void mux_printf(unsigned int mux_id, const char *format, ...)
 107 {
 108         va_list ap;
 109
 110         if (opt_multiplex) {
 111                 x_fprintf(x_stdout, "%d ", mux_id);
 112         }
 113
 114         va_start(ap, format);
 115         x_vfprintf(x_stdout, format, ap);
 116         va_end(ap);
 117 }
 118
 119
 120
 121 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 122    form DOMAIN/user into a domain and a user */
 123
 124 static bool parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 125                                         fstring user)
 126 {
 127
 128         char *p = strchr(domuser,*lp_winbind_separator(global_loadparm));
 129
 130         if (!p) {
 131                 return False;
 132         }
 133
 134         fstrcpy(user, p+1);
 135         fstrcpy(domain, domuser);
 136         domain[PTR_DIFF(p, domuser)] = 0;
 137
 138         return True;
 139 }
 140
 141 /**
 142  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 143  **/
 144 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 145 {
 146         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 147         ret.length = ldb_base64_decode((char *)ret.data);
 148         return ret;
 149 }
 150
 151 /**
 152  * Encode a base64 string into a talloc()ed string caller to free.
 153  **/
 154 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 155 {
 156         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 157 }
 158
 159 /**
 160  * Decode a base64 string in-place - wrapper for the above
 161  **/
 162 static void base64_decode_inplace(char *s)
 163 {
 164         ldb_base64_decode(s);
 165 }
 166
 167
 168
 169 /* Authenticate a user with a plaintext password */
 170
 171 static BOOL check_plaintext_auth(const char *user, const char *pass,
 172                                  BOOL stdout_diagnostics)
 173 {
 174         return (strcmp(pass, opt_password) == 0);
 175 }
 176
 177 /* authenticate a user with an encrypted username/password */
 178
 179 static NTSTATUS local_pw_check_specified(const char *username,
 180                                          const char *domain,
 181                                          const char *workstation,
 182                                          const DATA_BLOB *challenge,
 183                                          const DATA_BLOB *lm_response,
 184                                          const DATA_BLOB *nt_response,
 185                                          uint32_t flags,
 186                                          DATA_BLOB *lm_session_key,
 187                                          DATA_BLOB *user_session_key,
 188                                          char **error_string,
 189                                          char **unix_name)
 190 {
 191         NTSTATUS nt_status;
 192         struct samr_Password lm_pw, nt_pw;
 193         struct samr_Password *lm_pwd, *nt_pwd;
 194         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 195         if (!mem_ctx) {
 196                 nt_status = NT_STATUS_NO_MEMORY;
 197         } else {
 198
 199                 E_md4hash(opt_password, nt_pw.hash);
 200                 if (E_deshash(opt_password, lm_pw.hash)) {
 201                         lm_pwd = &lm_pw;
 202                 } else {
 203                         lm_pwd = NULL;
 204                 }
 205                 nt_pwd = &nt_pw;
 206
 207
 208                 nt_status = ntlm_password_check(mem_ctx,
 209                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 210                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 211                                                 challenge,
 212                                                 lm_response,
 213                                                 nt_response,
 214                                                 username,
 215                                                 username,
 216                                                 domain,
 217                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 218
 219                 if (NT_STATUS_IS_OK(nt_status)) {
 220                         if (unix_name) {
 221                                 asprintf(unix_name,
 222                                          "%s%c%s", domain,
 223                                          *lp_winbind_separator(global_loadparm),
 224                                          username);
 225                         }
 226                 } else {
 227                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 228                                   domain, username, workstation,
 229                                   nt_errstr(nt_status)));
 230                 }
 231                 talloc_free(mem_ctx);
 232         }
 233         if (error_string) {
 234                 *error_string = strdup(nt_errstr(nt_status));
 235         }
 236         return nt_status;
 237
 238
 239 }
 240
 241 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 242                                        char *buf, int length, void **private,
 243                                        unsigned int mux_id, void **private2)
 244 {
 245         char *user, *pass;
 246         user=buf;
 247
 248         pass = memchr(buf, ' ', length);
 249         if (!pass) {
 250                 DEBUG(2, ("Password not found. Denying access\n"));
 251                 mux_printf(mux_id, "ERR\n");
 252                 return;
 253         }
 254         *pass='\0';
 255         pass++;
 256
 257         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 258                 rfc1738_unescape(user);
 259                 rfc1738_unescape(pass);
 260         }
 261
 262         if (check_plaintext_auth(user, pass, False)) {
 263                 mux_printf(mux_id, "OK\n");
 264         } else {
 265                 mux_printf(mux_id, "ERR\n");
 266         }
 267 }
 268
 269 /* This is a bit hairy, but the basic idea is to do a password callback
 270    to the calling application.  The callback comes from within gensec */
 271
 272 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 273                                          char *buf, int length, void **private,
 274                                          unsigned int mux_id, void **password)
 275 {
 276         DATA_BLOB in;
 277         if (strlen(buf) < 2) {
 278                 DEBUG(1, ("query [%s] invalid", buf));
 279                 mux_printf(mux_id, "BH\n");
 280                 return;
 281         }
 282
 283         if (strlen(buf) > 3) {
 284                 in = base64_decode_data_blob(NULL, buf + 3);
 285         } else {
 286                 in = data_blob(NULL, 0);
 287         }
 288
 289         if (strncmp(buf, "PW ", 3) == 0) {
 290
 291                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 292                                            (const char *)in.data, in.length);
 293
 294                 if (*password == NULL) {
 295                         DEBUG(1, ("Out of memory\n"));
 296                         mux_printf(mux_id, "BH\n");
 297                         data_blob_free(&in);
 298                         return;
 299                 }
 300
 301                 mux_printf(mux_id, "OK\n");
 302                 data_blob_free(&in);
 303                 return;
 304         }
 305         DEBUG(1, ("Asked for (and expected) a password\n"));
 306         mux_printf(mux_id, "BH\n");
 307         data_blob_free(&in);
 308 }
 309
 310 /**
 311  * Callback for password credentails.  This is not async, and when
 312  * GENSEC and the credentails code is made async, it will look rather
 313  * different.
 314  */
 315
 316 static const char *get_password(struct cli_credentials *credentials)
 317 {
 318         char *password = NULL;
 319
 320         /* Ask for a password */
 321         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 322         credentials->priv_data = NULL;
 323
 324         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 325         return password;
 326 }
 327
 328 /**
 329  Check if a string is part of a list.
 330 **/
 331 static bool in_list(const char *s, const char *list, bool casesensitive)
 332 {
 333         pstring tok;
 334         const char *p=list;
 335
 336         if (!list)
 337                 return false;
 338
 339         while (next_token(&p, tok, LIST_SEP, sizeof(tok))) {
 340                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0)
 341                         return true;
 342         }
 343         return false;
 344 }
 345
 346 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 347 {
 348         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 349                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 350                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 351         }
 352         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 353                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 354                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 355         }
 356         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 357                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 358                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 359         }
 360 }
 361
 362 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 363                                   char *buf, int length, void **private,
 364                                   unsigned int mux_id, void **private2)
 365 {
 366         DATA_BLOB in;
 367         DATA_BLOB out = data_blob(NULL, 0);
 368         char *out_base64 = NULL;
 369         const char *reply_arg = NULL;
 370         struct gensec_ntlm_state {
 371                 struct gensec_security *gensec_state;
 372                 const char *set_password;
 373         };
 374         struct gensec_ntlm_state *state;
 375         struct event_context *ev;
 376         struct messaging_context *msg;
 377
 378         NTSTATUS nt_status;
 379         BOOL first = False;
 380         const char *reply_code;
 381         struct cli_credentials *creds;
 382
 383         static char *want_feature_list = NULL;
 384         static DATA_BLOB session_key;
 385
 386         TALLOC_CTX *mem_ctx;
 387
 388         if (*private) {
 389                 state = (struct gensec_ntlm_state *)*private;
 390         } else {
 391                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 392                 if (!state) {
 393                         mux_printf(mux_id, "BH No Memory\n");
 394                         exit(1);
 395                 }
 396                 *private = state;
 397                 if (opt_password) {
 398                         state->set_password = opt_password;
 399                 }
 400         }
 401
 402         if (strlen(buf) < 2) {
 403                 DEBUG(1, ("query [%s] invalid", buf));
 404                 mux_printf(mux_id, "BH\n");
 405                 return;
 406         }
 407
 408         if (strlen(buf) > 3) {
 409                 if(strncmp(buf, "SF ", 3) == 0) {
 410                         DEBUG(10, ("Setting flags to negotiate\n"));
 411                         talloc_free(want_feature_list);
 412                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 413                         mux_printf(mux_id, "OK\n");
 414                         return;
 415                 }
 416                 in = base64_decode_data_blob(NULL, buf + 3);
 417         } else {
 418                 in = data_blob(NULL, 0);
 419         }
 420
 421         if (strncmp(buf, "YR", 2) == 0) {
 422                 if (state->gensec_state) {
 423                         talloc_free(state->gensec_state);
 424                         state->gensec_state = NULL;
 425                 }
 426         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 427                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 428                 mux_printf(mux_id, "BH\n");
 429                 data_blob_free(&in);
 430                 return;
 431         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 432                     (strncmp(buf, "KK ", 3) != 0) &&
 433                     (strncmp(buf, "AF ", 3) != 0) &&
 434                     (strncmp(buf, "NA ", 3) != 0) &&
 435                     (strncmp(buf, "UG", 2) != 0) &&
 436                     (strncmp(buf, "PW ", 3) != 0) &&
 437                     (strncmp(buf, "GK", 2) != 0) &&
 438                     (strncmp(buf, "GF", 2) != 0)) {
 439                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 440                 mux_printf(mux_id, "BH\n");
 441                 data_blob_free(&in);
 442                 return;
 443         }
 444
 445         /* setup gensec */
 446         if (!(state->gensec_state)) {
 447                 switch (stdio_helper_mode) {
 448                 case GSS_SPNEGO_CLIENT:
 449                 case NTLMSSP_CLIENT_1:
 450                         /* setup the client side */
 451
 452                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 453                         if (!NT_STATUS_IS_OK(nt_status)) {
 454                                 exit(1);
 455                         }
 456
 457                         break;
 458                 case GSS_SPNEGO_SERVER:
 459                 case SQUID_2_5_NTLMSSP:
 460                         ev = event_context_init(state);
 461                         if (!ev) {
 462                                 exit(1);
 463                         }
 464                         msg = messaging_client_init(state, global_loadparm, ev);
 465                         if (!msg) {
 466                                 exit(1);
 467                         }
 468                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev, msg, &state->gensec_state))) {
 469                                 exit(1);
 470                         }
 471                         break;
 472                 default:
 473                         abort();
 474                 }
 475
 476                 creds = cli_credentials_init(state->gensec_state);
 477                 cli_credentials_set_conf(creds, global_loadparm);
 478                 if (opt_username) {
 479                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 480                 }
 481                 if (opt_domain) {
 482                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 483                 }
 484                 if (state->set_password) {
 485                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 486                 } else {
 487                         cli_credentials_set_password_callback(creds, get_password);
 488                         creds->priv_data = (void*)mux_id;
 489                 }
 490                 if (opt_workstation) {
 491                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 492                 }
 493
 494                 switch (stdio_helper_mode) {
 495                 case GSS_SPNEGO_SERVER:
 496                 case SQUID_2_5_NTLMSSP:
 497                         cli_credentials_set_machine_account(creds);
 498                         break;
 499                 default:
 500                         break;
 501                 }
 502
 503                 gensec_set_credentials(state->gensec_state, creds);
 504                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 505
 506                 switch (stdio_helper_mode) {
 507                 case GSS_SPNEGO_CLIENT:
 508                 case GSS_SPNEGO_SERVER:
 509                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 510                         if (!in.length) {
 511                                 first = True;
 512                         }
 513                         break;
 514                 case NTLMSSP_CLIENT_1:
 515                         if (!in.length) {
 516                                 first = True;
 517                         }
 518                         /* fall through */
 519                 case SQUID_2_5_NTLMSSP:
 520                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 521                         break;
 522                 default:
 523                         abort();
 524                 }
 525
 526                 if (!NT_STATUS_IS_OK(nt_status)) {
 527                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 528                         mux_printf(mux_id, "BH\n");
 529                         return;
 530                 }
 531
 532         }
 533
 534         /* update */
 535         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 536
 537         if (strncmp(buf, "PW ", 3) == 0) {
 538                 state->set_password = talloc_strndup(state,
 539                                                      (const char *)in.data,
 540                                                      in.length);
 541
 542                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 543                                              state->set_password,
 544                                              CRED_SPECIFIED);
 545                 mux_printf(mux_id, "OK\n");
 546                 data_blob_free(&in);
 547                 talloc_free(mem_ctx);
 548                 return;
 549         }
 550
 551         if (strncmp(buf, "UG", 2) == 0) {
 552                 int i;
 553                 char *grouplist = NULL;
 554                 struct auth_session_info *session_info;
 555
 556                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 557                 if (!NT_STATUS_IS_OK(nt_status)) {
 558                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 559                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 560                         data_blob_free(&in);
 561                         talloc_free(mem_ctx);
 562                         return;
 563                 }
 564
 565                 /* get the string onto the context */
 566                 grouplist = talloc_strdup(mem_ctx, "");
 567
 568                 for (i=0; i<session_info->security_token->num_sids; i++) {
 569                         struct security_token *token = session_info->security_token;
 570                         const char *sidstr = dom_sid_string(session_info,
 571                                                             token->sids[i]);
 572                         grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
 573                 }
 574
 575                 mux_printf(mux_id, "GL %s\n", grouplist);
 576                 talloc_free(session_info);
 577                 data_blob_free(&in);
 578                 talloc_free(mem_ctx);
 579                 return;
 580         }
 581
 582         if (strncmp(buf, "GK", 2) == 0) {
 583                 char *base64_key;
 584                 DEBUG(10, ("Requested session key\n"));
 585                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 586                 if(!NT_STATUS_IS_OK(nt_status)) {
 587                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 588                         mux_printf(mux_id, "BH No session key\n");
 589                         talloc_free(mem_ctx);
 590                         return;
 591                 } else {
 592                         base64_key = base64_encode_data_blob(state, session_key);
 593                         mux_printf(mux_id, "GK %s\n", base64_key);
 594                         talloc_free(base64_key);
 595                 }
 596                 talloc_free(mem_ctx);
 597                 return;
 598         }
 599
 600         if (strncmp(buf, "GF", 2) == 0) {
 601                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 602                 uint32_t neg_flags;
 603
 604                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 605                                 struct gensec_ntlmssp_state);
 606                 neg_flags = gensec_ntlmssp_state->neg_flags;
 607
 608                 DEBUG(10, ("Requested negotiated feature flags\n"));
 609                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 610                 return;
 611         }
 612
 613         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 614
 615         /* don't leak 'bad password'/'no such user' info to the network client */
 616         nt_status = auth_nt_status_squash(nt_status);
 617
 618         if (out.length) {
 619                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 620         } else {
 621                 out_base64 = NULL;
 622         }
 623
 624         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 625                 reply_arg = "*";
 626                 if (first) {
 627                         reply_code = "YR";
 628                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 629                         reply_code = "KK";
 630                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 631                         reply_code = "TT";
 632                 } else {
 633                         abort();
 634                 }
 635
 636
 637         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 638                 reply_code = "BH";
 639                 reply_arg = nt_errstr(nt_status);
 640                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 641         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 642                 reply_code = "BH";
 643                 reply_arg = nt_errstr(nt_status);
 644                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 645         } else if (!NT_STATUS_IS_OK(nt_status)) {
 646                 reply_code = "NA";
 647                 reply_arg = nt_errstr(nt_status);
 648                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 649         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 650                 struct auth_session_info *session_info;
 651
 652                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 653                 if (!NT_STATUS_IS_OK(nt_status)) {
 654                         reply_code = "BH";
 655                         reply_arg = nt_errstr(nt_status);
 656                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 657                 } else {
 658
 659                         reply_code = "AF";
 660                         reply_arg = talloc_asprintf(state->gensec_state,
 661                                                     "%s%s%s", session_info->server_info->domain_name,
 662                                                     lp_winbind_separator(global_loadparm), session_info->server_info->account_name);
 663                         talloc_free(session_info);
 664                 }
 665         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 666                 reply_code = "AF";
 667                 reply_arg = out_base64;
 668         } else {
 669                 abort();
 670         }
 671
 672         switch (stdio_helper_mode) {
 673         case GSS_SPNEGO_SERVER:
 674                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 675                           out_base64 ? out_base64 : "*",
 676                           reply_arg ? reply_arg : "*");
 677                 break;
 678         default:
 679                 if (out_base64) {
 680                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 681                 } else if (reply_arg) {
 682                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 683                 } else {
 684                         mux_printf(mux_id, "%s\n", reply_code);
 685                 }
 686         }
 687
 688         talloc_free(mem_ctx);
 689         return;
 690 }
 691
 692 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 693                                          char *buf, int length, void **private,
 694                                          unsigned int mux_id, void **private2)
 695 {
 696         char *request, *parameter;
 697         static DATA_BLOB challenge;
 698         static DATA_BLOB lm_response;
 699         static DATA_BLOB nt_response;
 700         static char *full_username;
 701         static char *username;
 702         static char *domain;
 703         static char *plaintext_password;
 704         static BOOL ntlm_server_1_user_session_key;
 705         static BOOL ntlm_server_1_lm_session_key;
 706
 707         if (strequal(buf, ".")) {
 708                 if (!full_username && !username) {
 709                         mux_printf(mux_id, "Error: No username supplied!\n");
 710                 } else if (plaintext_password) {
 711                         /* handle this request as plaintext */
 712                         if (!full_username) {
 713                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(global_loadparm), username) == -1) {
 714                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 715                                         return;
 716                                 }
 717                         }
 718                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 719                                 mux_printf(mux_id, "Authenticated: Yes\n");
 720                         } else {
 721                                 mux_printf(mux_id, "Authenticated: No\n");
 722                         }
 723                 } else if (!lm_response.data && !nt_response.data) {
 724                         mux_printf(mux_id, "Error: No password supplied!\n");
 725                 } else if (!challenge.data) {
 726                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 727                 } else {
 728                         char *error_string = NULL;
 729                         DATA_BLOB lm_key;
 730                         DATA_BLOB user_session_key;
 731                         uint32_t flags = 0;
 732
 733                         if (full_username && !username) {
 734                                 fstring fstr_user;
 735                                 fstring fstr_domain;
 736
 737                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 738                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 739                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 740                                 }
 741                                 SAFE_FREE(username);
 742                                 SAFE_FREE(domain);
 743                                 username = smb_xstrdup(fstr_user);
 744                                 domain = smb_xstrdup(fstr_domain);
 745                         }
 746
 747                         if (!domain) {
 748                                 domain = smb_xstrdup(lp_workgroup(global_loadparm));
 749                         }
 750
 751                         if (ntlm_server_1_lm_session_key)
 752                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 753
 754                         if (ntlm_server_1_user_session_key)
 755                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 756
 757                         if (!NT_STATUS_IS_OK(
 758                                     local_pw_check_specified(username,
 759                                                               domain,
 760                                                               lp_netbios_name(global_loadparm),
 761                                                               &challenge,
 762                                                               &lm_response,
 763                                                               &nt_response,
 764                                                               flags,
 765                                                               &lm_key,
 766                                                               &user_session_key,
 767                                                               &error_string,
 768                                                               NULL))) {
 769
 770                                 mux_printf(mux_id, "Authenticated: No\n");
 771                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 772                                 SAFE_FREE(error_string);
 773                         } else {
 774                                 static char zeros[16];
 775                                 char *hex_lm_key;
 776                                 char *hex_user_session_key;
 777
 778                                 mux_printf(mux_id, "Authenticated: Yes\n");
 779
 780                                 if (ntlm_server_1_lm_session_key
 781                                     && lm_key.length
 782                                     && (memcmp(zeros, lm_key.data,
 783                                                                 lm_key.length) != 0)) {
 784                                         hex_encode(lm_key.data,
 785                                                    lm_key.length,
 786                                                    &hex_lm_key);
 787                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 788                                         SAFE_FREE(hex_lm_key);
 789                                 }
 790
 791                                 if (ntlm_server_1_user_session_key
 792                                     && user_session_key.length
 793                                     && (memcmp(zeros, user_session_key.data,
 794                                                user_session_key.length) != 0)) {
 795                                         hex_encode(user_session_key.data,
 796                                                    user_session_key.length,
 797                                                    &hex_user_session_key);
 798                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 799                                         SAFE_FREE(hex_user_session_key);
 800                                 }
 801                         }
 802                 }
 803                 /* clear out the state */
 804                 challenge = data_blob(NULL, 0);
 805                 nt_response = data_blob(NULL, 0);
 806                 lm_response = data_blob(NULL, 0);
 807                 SAFE_FREE(full_username);
 808                 SAFE_FREE(username);
 809                 SAFE_FREE(domain);
 810                 SAFE_FREE(plaintext_password);
 811                 ntlm_server_1_user_session_key = False;
 812                 ntlm_server_1_lm_session_key = False;
 813                 mux_printf(mux_id, ".\n");
 814
 815                 return;
 816         }
 817
 818         request = buf;
 819
 820         /* Indicates a base64 encoded structure */
 821         parameter = strstr(request, ":: ");
 822         if (!parameter) {
 823                 parameter = strstr(request, ": ");
 824
 825                 if (!parameter) {
 826                         DEBUG(0, ("Parameter not found!\n"));
 827                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 828                         return;
 829                 }
 830
 831                 parameter[0] ='\0';
 832                 parameter++;
 833                 parameter[0] ='\0';
 834                 parameter++;
 835
 836         } else {
 837                 parameter[0] ='\0';
 838                 parameter++;
 839                 parameter[0] ='\0';
 840                 parameter++;
 841                 parameter[0] ='\0';
 842                 parameter++;
 843
 844                 base64_decode_inplace(parameter);
 845         }
 846
 847         if (strequal(request, "LANMAN-Challenge")) {
 848                 challenge = strhex_to_data_blob(parameter);
 849                 if (challenge.length != 8) {
 850                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 851                                   parameter,
 852                                   (int)challenge.length);
 853                         challenge = data_blob(NULL, 0);
 854                 }
 855         } else if (strequal(request, "NT-Response")) {
 856                 nt_response = strhex_to_data_blob(parameter);
 857                 if (nt_response.length < 24) {
 858                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 859                                   parameter,
 860                                   (int)nt_response.length);
 861                         nt_response = data_blob(NULL, 0);
 862                 }
 863         } else if (strequal(request, "LANMAN-Response")) {
 864                 lm_response = strhex_to_data_blob(parameter);
 865                 if (lm_response.length != 24) {
 866                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 867                                   parameter,
 868                                   (int)lm_response.length);
 869                         lm_response = data_blob(NULL, 0);
 870                 }
 871         } else if (strequal(request, "Password")) {
 872                 plaintext_password = smb_xstrdup(parameter);
 873         } else if (strequal(request, "NT-Domain")) {
 874                 domain = smb_xstrdup(parameter);
 875         } else if (strequal(request, "Username")) {
 876                 username = smb_xstrdup(parameter);
 877         } else if (strequal(request, "Full-Username")) {
 878                 full_username = smb_xstrdup(parameter);
 879         } else if (strequal(request, "Request-User-Session-Key")) {
 880                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 881         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 882                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 883         } else {
 884                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 885         }
 886 }
 887
 888 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 889                                  stdio_helper_function fn, void **private2)
 890 {
 891         char *buf;
 892         char tmp[INITIAL_BUFFER_SIZE+1];
 893         unsigned int mux_id = 0;
 894         int length, buf_size = 0;
 895         char *c;
 896         struct mux_private {
 897                 unsigned int max_mux;
 898                 void **private_pointers;
 899         };
 900
 901         static struct mux_private *mux_private;
 902         static void *normal_private;
 903         void **private;
 904
 905         buf = talloc_strdup(NULL, "");
 906
 907         if (buf == NULL) {
 908                 DEBUG(0, ("Failed to allocate memory for reading the input "
 909                           "buffer.\n"));
 910                 x_fprintf(x_stdout, "ERR\n");
 911                 return;
 912         }
 913
 914         do {
 915                 /* this is not a typo - x_fgets doesn't work too well under
 916                  * squid */
 917                 if (fgets(tmp, INITIAL_BUFFER_SIZE, stdin) == NULL) {
 918                         if (ferror(stdin)) {
 919                                 DEBUG(1, ("fgets() failed! dying..... errno=%d "
 920                                           "(%s)\n", ferror(stdin),
 921                                           strerror(ferror(stdin))));
 922
 923                                 exit(1);    /* BIIG buffer */
 924                         }
 925                         exit(0);
 926                 }
 927
 928                 buf = talloc_strdup_append_buffer(buf, tmp);
 929                 buf_size += INITIAL_BUFFER_SIZE;
 930
 931                 if (buf_size > MAX_BUFFER_SIZE) {
 932                         DEBUG(0, ("Invalid Request (too large)\n"));
 933                         x_fprintf(x_stdout, "ERR\n");
 934                         talloc_free(buf);
 935                         return;
 936                 }
 937
 938                 c = strchr(buf, '\n');
 939         } while (c == NULL);
 940
 941         *c = '\0';
 942         length = c-buf;
 943
 944         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 945
 946         if (buf[0] == '\0') {
 947                 DEBUG(0, ("Invalid Request (empty)\n"));
 948                 x_fprintf(x_stdout, "ERR\n");
 949                 talloc_free(buf);
 950                 return;
 951         }
 952
 953         if (opt_multiplex) {
 954                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 955                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 956                         x_fprintf(x_stdout, "ERR\n");
 957                         talloc_free(buf);
 958                         return;
 959                 }
 960                 if (!mux_private) {
 961                         mux_private = talloc(NULL, struct mux_private);
 962                         mux_private->max_mux = 0;
 963                         mux_private->private_pointers = NULL;
 964                 }
 965
 966                 c=strchr(buf,' ');
 967                 if (!c) {
 968                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 969                         x_fprintf(x_stdout, "ERR\n");
 970                         talloc_free(buf);
 971                         return;
 972                 }
 973                 c++;
 974                 if (mux_id >= mux_private->max_mux) {
 975                         unsigned int prev_max = mux_private->max_mux;
 976                         mux_private->max_mux = mux_id + 1;
 977                         mux_private->private_pointers
 978                                 = talloc_realloc(mux_private,
 979                                                    mux_private->private_pointers,
 980                                                    void *, mux_private->max_mux);
 981                         memset(&mux_private->private_pointers[prev_max], '\0',
 982                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 983                 };
 984
 985                 private = &mux_private->private_pointers[mux_id];
 986         } else {
 987                 c = buf;
 988                 private = &normal_private;
 989         }
 990
 991         fn(helper_mode, c, length, private, mux_id, private2);
 992         talloc_free(buf);
 993 }
 994
 995 static void squid_stream(enum stdio_helper_mode stdio_mode,
 996                          stdio_helper_function fn) {
 997         /* initialize FDescs */
 998         x_setbuf(x_stdout, NULL);
 999         x_setbuf(x_stderr, NULL);
1000         while(1) {
1001                 manage_squid_request(stdio_mode, fn, NULL);
1002         }
1003 }
1004
1005
1006 /* Main program */
1007
1008 enum {
1009         OPT_USERNAME = 1000,
1010         OPT_DOMAIN,
1011         OPT_WORKSTATION,
1012         OPT_CHALLENGE,
1013         OPT_RESPONSE,
1014         OPT_LM,
1015         OPT_NT,
1016         OPT_PASSWORD,
1017         OPT_LM_KEY,
1018         OPT_USER_SESSION_KEY,
1019         OPT_DIAGNOSTICS,
1020         OPT_REQUIRE_MEMBERSHIP,
1021         OPT_MULTIPLEX,
1022         OPT_USE_CACHED_CREDS,
1023 };
1024
1025 int main(int argc, const char **argv)
1026 {
1027         static const char *helper_protocol;
1028         int opt;
1029
1030         poptContext pc;
1031
1032         /* NOTE: DO NOT change this interface without considering the implications!
1033            This is an external interface, which other programs will use to interact
1034            with this helper.
1035         */
1036
1037         /* We do not use single-letter command abbreviations, because they harm future
1038            interface stability. */
1039
1040         struct poptOption long_options[] = {
1041                 POPT_AUTOHELP
1042                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1043                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1044                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1045                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1046                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1047                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1048                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1049                 POPT_COMMON_SAMBA
1050                 POPT_COMMON_VERSION
1051                 { NULL }
1052         };
1053
1054         /* Samba client initialisation */
1055
1056         setup_logging(NULL, DEBUG_STDERR);
1057
1058         /* Parse options */
1059
1060         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1061
1062         /* Parse command line options */
1063
1064         if (argc == 1) {
1065                 poptPrintHelp(pc, stderr, 0);
1066                 return 1;
1067         }
1068
1069         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1070                             POPT_CONTEXT_KEEP_FIRST);
1071
1072         while((opt = poptGetNextOpt(pc)) != -1) {
1073                 if (opt < -1) {
1074                         break;
1075                 }
1076         }
1077         if (opt < -1) {
1078                 fprintf(stderr, "%s: %s\n",
1079                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1080                         poptStrerror(opt));
1081                 return 1;
1082         }
1083
1084         gensec_init();
1085
1086         if (opt_domain == NULL) {
1087                 opt_domain = lp_workgroup(global_loadparm);
1088         }
1089
1090         if (helper_protocol) {
1091                 int i;
1092                 for (i=0; i<NUM_HELPER_MODES; i++) {
1093                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1094                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1095                                 exit(0);
1096                         }
1097                 }
1098                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1099
1100                 for (i=0; i<NUM_HELPER_MODES; i++) {
1101                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1102                 }
1103
1104                 exit(1);
1105         }
1106
1107         if (!opt_username) {
1108                 x_fprintf(x_stderr, "username must be specified!\n\n");
1109                 poptPrintHelp(pc, stderr, 0);
1110                 exit(1);
1111         }
1112
1113         if (opt_workstation == NULL) {
1114                 opt_workstation = lp_netbios_name(global_loadparm);
1115         }
1116
1117         if (!opt_password) {
1118                 opt_password = getpass("password: ");
1119         }
1120
1121         {
1122                 char *user;
1123
1124                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(global_loadparm), opt_username);
1125                 if (!check_plaintext_auth(user, opt_password, True)) {
1126                         return 1;
1127                 }
1128         }
1129
1130         /* Exit code */
1131
1132         poptFreeContext(pc);
1133         return 0;
1134 }