source4/utils/ntlm_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind status program.
   5
   6    Copyright (C) Tim Potter      2000-2003
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2004
   8    Copyright (C) Francesco Chemolli <kinkie@kame.usr.dsi.unimi.it> 2000
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 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                                       struct loadparm_context *lp_ctx,
  62                                       char *buf, int length, void **private,
  63                                       unsigned int mux_id, void **private2);
  64
  65 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  66                                         struct loadparm_context *lp_ctx,
  67                                         char *buf, int length, void **private,
  68                                         unsigned int mux_id, void **private2);
  69
  70 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  71                                    struct loadparm_context *lp_ctx,
  72                                    char *buf, int length, void **private,
  73                                    unsigned int mux_id, void **private2);
  74
  75 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  76                                           struct loadparm_context *lp_ctx,
  77                                           char *buf, int length, void **private,
  78                                           unsigned int mux_id, void **private2);
  79
  80 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  81                                  stdio_helper_function fn, void **private2);
  82
  83 static const struct {
  84         enum stdio_helper_mode mode;
  85         const char *name;
  86         stdio_helper_function fn;
  87 } stdio_helper_protocols[] = {
  88         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  89         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  90         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  91         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  92         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  93         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  94         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  95         { NUM_HELPER_MODES, NULL, NULL}
  96 };
  97
  98 extern int winbindd_fd;
  99
 100 static const char *opt_username;
 101 static const char *opt_domain;
 102 static const char *opt_workstation;
 103 static const char *opt_password;
 104 static int opt_multiplex;
 105 static int use_cached_creds;
 106
 107
 108 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 109
 110 static void mux_printf(unsigned int mux_id, const char *format, ...)
 111 {
 112         va_list ap;
 113
 114         if (opt_multiplex) {
 115                 x_fprintf(x_stdout, "%d ", mux_id);
 116         }
 117
 118         va_start(ap, format);
 119         x_vfprintf(x_stdout, format, ap);
 120         va_end(ap);
 121 }
 122
 123
 124
 125 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 126    form DOMAIN/user into a domain and a user */
 127
 128 static bool parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 129                                         fstring user)
 130 {
 131
 132         char *p = strchr(domuser,*lp_winbind_separator(global_loadparm));
 133
 134         if (!p) {
 135                 return false;
 136         }
 137
 138         fstrcpy(user, p+1);
 139         fstrcpy(domain, domuser);
 140         domain[PTR_DIFF(p, domuser)] = 0;
 141
 142         return true;
 143 }
 144
 145 /**
 146  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 147  **/
 148 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 149 {
 150         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 151         ret.length = ldb_base64_decode((char *)ret.data);
 152         return ret;
 153 }
 154
 155 /**
 156  * Encode a base64 string into a talloc()ed string caller to free.
 157  **/
 158 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 159 {
 160         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 161 }
 162
 163 /**
 164  * Decode a base64 string in-place - wrapper for the above
 165  **/
 166 static void base64_decode_inplace(char *s)
 167 {
 168         ldb_base64_decode(s);
 169 }
 170
 171
 172
 173 /* Authenticate a user with a plaintext password */
 174
 175 static bool check_plaintext_auth(const char *user, const char *pass,
 176                                  bool stdout_diagnostics)
 177 {
 178         return (strcmp(pass, opt_password) == 0);
 179 }
 180
 181 /* authenticate a user with an encrypted username/password */
 182
 183 static NTSTATUS local_pw_check_specified(struct loadparm_context *lp_ctx,
 184                                          const char *username,
 185                                          const char *domain,
 186                                          const char *workstation,
 187                                          const DATA_BLOB *challenge,
 188                                          const DATA_BLOB *lm_response,
 189                                          const DATA_BLOB *nt_response,
 190                                          uint32_t flags,
 191                                          DATA_BLOB *lm_session_key,
 192                                          DATA_BLOB *user_session_key,
 193                                          char **error_string,
 194                                          char **unix_name)
 195 {
 196         NTSTATUS nt_status;
 197         struct samr_Password lm_pw, nt_pw;
 198         struct samr_Password *lm_pwd, *nt_pwd;
 199         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 200         if (!mem_ctx) {
 201                 nt_status = NT_STATUS_NO_MEMORY;
 202         } else {
 203
 204                 E_md4hash(opt_password, nt_pw.hash);
 205                 if (E_deshash(opt_password, lm_pw.hash)) {
 206                         lm_pwd = &lm_pw;
 207                 } else {
 208                         lm_pwd = NULL;
 209                 }
 210                 nt_pwd = &nt_pw;
 211
 212
 213                 nt_status = ntlm_password_check(mem_ctx,
 214                                                 lp_ctx,
 215                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 216                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 217                                                 challenge,
 218                                                 lm_response,
 219                                                 nt_response,
 220                                                 username,
 221                                                 username,
 222                                                 domain,
 223                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 224
 225                 if (NT_STATUS_IS_OK(nt_status)) {
 226                         if (unix_name) {
 227                                 asprintf(unix_name,
 228                                          "%s%c%s", domain,
 229                                          *lp_winbind_separator(global_loadparm),
 230                                          username);
 231                         }
 232                 } else {
 233                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 234                                   domain, username, workstation,
 235                                   nt_errstr(nt_status)));
 236                 }
 237                 talloc_free(mem_ctx);
 238         }
 239         if (error_string) {
 240                 *error_string = strdup(nt_errstr(nt_status));
 241         }
 242         return nt_status;
 243
 244
 245 }
 246
 247 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 248                                        struct loadparm_context *lp_ctx,
 249                                        char *buf, int length, void **private,
 250                                        unsigned int mux_id, void **private2)
 251 {
 252         char *user, *pass;
 253         user=buf;
 254
 255         pass = memchr(buf, ' ', length);
 256         if (!pass) {
 257                 DEBUG(2, ("Password not found. Denying access\n"));
 258                 mux_printf(mux_id, "ERR\n");
 259                 return;
 260         }
 261         *pass='\0';
 262         pass++;
 263
 264         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 265                 rfc1738_unescape(user);
 266                 rfc1738_unescape(pass);
 267         }
 268
 269         if (check_plaintext_auth(user, pass, false)) {
 270                 mux_printf(mux_id, "OK\n");
 271         } else {
 272                 mux_printf(mux_id, "ERR\n");
 273         }
 274 }
 275
 276 /* This is a bit hairy, but the basic idea is to do a password callback
 277    to the calling application.  The callback comes from within gensec */
 278
 279 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 280                                          struct loadparm_context *lp_ctx,
 281                                          char *buf, int length, void **private,
 282                                          unsigned int mux_id, void **password)
 283 {
 284         DATA_BLOB in;
 285         if (strlen(buf) < 2) {
 286                 DEBUG(1, ("query [%s] invalid", buf));
 287                 mux_printf(mux_id, "BH\n");
 288                 return;
 289         }
 290
 291         if (strlen(buf) > 3) {
 292                 in = base64_decode_data_blob(NULL, buf + 3);
 293         } else {
 294                 in = data_blob(NULL, 0);
 295         }
 296
 297         if (strncmp(buf, "PW ", 3) == 0) {
 298
 299                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 300                                            (const char *)in.data, in.length);
 301
 302                 if (*password == NULL) {
 303                         DEBUG(1, ("Out of memory\n"));
 304                         mux_printf(mux_id, "BH\n");
 305                         data_blob_free(&in);
 306                         return;
 307                 }
 308
 309                 mux_printf(mux_id, "OK\n");
 310                 data_blob_free(&in);
 311                 return;
 312         }
 313         DEBUG(1, ("Asked for (and expected) a password\n"));
 314         mux_printf(mux_id, "BH\n");
 315         data_blob_free(&in);
 316 }
 317
 318 /**
 319  * Callback for password credentials.  This is not async, and when
 320  * GENSEC and the credentials code is made async, it will look rather
 321  * different.
 322  */
 323
 324 static const char *get_password(struct cli_credentials *credentials)
 325 {
 326         char *password = NULL;
 327
 328         /* Ask for a password */
 329         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 330         credentials->priv_data = NULL;
 331
 332         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 333         return password;
 334 }
 335
 336 /**
 337  Check if a string is part of a list.
 338 **/
 339 static bool in_list(const char *s, const char *list, bool casesensitive)
 340 {
 341         pstring tok;
 342         const char *p=list;
 343
 344         if (!list)
 345                 return false;
 346
 347         while (next_token(&p, tok, LIST_SEP, sizeof(tok))) {
 348                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0)
 349                         return true;
 350         }
 351         return false;
 352 }
 353
 354 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 355 {
 356         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, true)) {
 357                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 358                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 359         }
 360         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, true)) {
 361                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 362                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 363         }
 364         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, true)) {
 365                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 366                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 367         }
 368 }
 369
 370 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 371                                   struct loadparm_context *lp_ctx,
 372                                   char *buf, int length, void **private,
 373                                   unsigned int mux_id, void **private2)
 374 {
 375         DATA_BLOB in;
 376         DATA_BLOB out = data_blob(NULL, 0);
 377         char *out_base64 = NULL;
 378         const char *reply_arg = NULL;
 379         struct gensec_ntlm_state {
 380                 struct gensec_security *gensec_state;
 381                 const char *set_password;
 382         };
 383         struct gensec_ntlm_state *state;
 384         struct event_context *ev;
 385         struct messaging_context *msg;
 386
 387         NTSTATUS nt_status;
 388         bool first = false;
 389         const char *reply_code;
 390         struct cli_credentials *creds;
 391
 392         static char *want_feature_list = NULL;
 393         static DATA_BLOB session_key;
 394
 395         TALLOC_CTX *mem_ctx;
 396
 397         if (*private) {
 398                 state = (struct gensec_ntlm_state *)*private;
 399         } else {
 400                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 401                 if (!state) {
 402                         mux_printf(mux_id, "BH No Memory\n");
 403                         exit(1);
 404                 }
 405                 *private = state;
 406                 if (opt_password) {
 407                         state->set_password = opt_password;
 408                 }
 409         }
 410
 411         if (strlen(buf) < 2) {
 412                 DEBUG(1, ("query [%s] invalid", buf));
 413                 mux_printf(mux_id, "BH\n");
 414                 return;
 415         }
 416
 417         if (strlen(buf) > 3) {
 418                 if(strncmp(buf, "SF ", 3) == 0) {
 419                         DEBUG(10, ("Setting flags to negotiate\n"));
 420                         talloc_free(want_feature_list);
 421                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 422                         mux_printf(mux_id, "OK\n");
 423                         return;
 424                 }
 425                 in = base64_decode_data_blob(NULL, buf + 3);
 426         } else {
 427                 in = data_blob(NULL, 0);
 428         }
 429
 430         if (strncmp(buf, "YR", 2) == 0) {
 431                 if (state->gensec_state) {
 432                         talloc_free(state->gensec_state);
 433                         state->gensec_state = NULL;
 434                 }
 435         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 436                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 437                 mux_printf(mux_id, "BH\n");
 438                 data_blob_free(&in);
 439                 return;
 440         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 441                     (strncmp(buf, "KK ", 3) != 0) &&
 442                     (strncmp(buf, "AF ", 3) != 0) &&
 443                     (strncmp(buf, "NA ", 3) != 0) &&
 444                     (strncmp(buf, "UG", 2) != 0) &&
 445                     (strncmp(buf, "PW ", 3) != 0) &&
 446                     (strncmp(buf, "GK", 2) != 0) &&
 447                     (strncmp(buf, "GF", 2) != 0)) {
 448                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 449                 mux_printf(mux_id, "BH\n");
 450                 data_blob_free(&in);
 451                 return;
 452         }
 453
 454         /* setup gensec */
 455         if (!(state->gensec_state)) {
 456                 switch (stdio_helper_mode) {
 457                 case GSS_SPNEGO_CLIENT:
 458                 case NTLMSSP_CLIENT_1:
 459                         /* setup the client side */
 460
 461                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 462                         if (!NT_STATUS_IS_OK(nt_status)) {
 463                                 exit(1);
 464                         }
 465
 466                         break;
 467                 case GSS_SPNEGO_SERVER:
 468                 case SQUID_2_5_NTLMSSP:
 469                         ev = event_context_init(state);
 470                         if (!ev) {
 471                                 exit(1);
 472                         }
 473                         msg = messaging_client_init(state, lp_messaging_path(state, global_loadparm), ev);
 474                         if (!msg) {
 475                                 exit(1);
 476                         }
 477                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev, msg, &state->gensec_state))) {
 478                                 exit(1);
 479                         }
 480                         break;
 481                 default:
 482                         abort();
 483                 }
 484
 485                 creds = cli_credentials_init(state->gensec_state);
 486                 cli_credentials_set_conf(creds, global_loadparm);
 487                 if (opt_username) {
 488                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 489                 }
 490                 if (opt_domain) {
 491                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 492                 }
 493                 if (state->set_password) {
 494                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 495                 } else {
 496                         cli_credentials_set_password_callback(creds, get_password);
 497                         creds->priv_data = (void*)mux_id;
 498                 }
 499                 if (opt_workstation) {
 500                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 501                 }
 502
 503                 switch (stdio_helper_mode) {
 504                 case GSS_SPNEGO_SERVER:
 505                 case SQUID_2_5_NTLMSSP:
 506                         cli_credentials_set_machine_account(creds);
 507                         break;
 508                 default:
 509                         break;
 510                 }
 511
 512                 gensec_set_credentials(state->gensec_state, creds);
 513                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 514
 515                 switch (stdio_helper_mode) {
 516                 case GSS_SPNEGO_CLIENT:
 517                 case GSS_SPNEGO_SERVER:
 518                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 519                         if (!in.length) {
 520                                 first = true;
 521                         }
 522                         break;
 523                 case NTLMSSP_CLIENT_1:
 524                         if (!in.length) {
 525                                 first = true;
 526                         }
 527                         /* fall through */
 528                 case SQUID_2_5_NTLMSSP:
 529                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 530                         break;
 531                 default:
 532                         abort();
 533                 }
 534
 535                 if (!NT_STATUS_IS_OK(nt_status)) {
 536                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 537                         mux_printf(mux_id, "BH\n");
 538                         return;
 539                 }
 540
 541         }
 542
 543         /* update */
 544         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 545
 546         if (strncmp(buf, "PW ", 3) == 0) {
 547                 state->set_password = talloc_strndup(state,
 548                                                      (const char *)in.data,
 549                                                      in.length);
 550
 551                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 552                                              state->set_password,
 553                                              CRED_SPECIFIED);
 554                 mux_printf(mux_id, "OK\n");
 555                 data_blob_free(&in);
 556                 talloc_free(mem_ctx);
 557                 return;
 558         }
 559
 560         if (strncmp(buf, "UG", 2) == 0) {
 561                 int i;
 562                 char *grouplist = NULL;
 563                 struct auth_session_info *session_info;
 564
 565                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 566                 if (!NT_STATUS_IS_OK(nt_status)) {
 567                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 568                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 569                         data_blob_free(&in);
 570                         talloc_free(mem_ctx);
 571                         return;
 572                 }
 573
 574                 /* get the string onto the context */
 575                 grouplist = talloc_strdup(mem_ctx, "");
 576
 577                 for (i=0; i<session_info->security_token->num_sids; i++) {
 578                         struct security_token *token = session_info->security_token;
 579                         const char *sidstr = dom_sid_string(session_info,
 580                                                             token->sids[i]);
 581                         grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
 582                 }
 583
 584                 mux_printf(mux_id, "GL %s\n", grouplist);
 585                 talloc_free(session_info);
 586                 data_blob_free(&in);
 587                 talloc_free(mem_ctx);
 588                 return;
 589         }
 590
 591         if (strncmp(buf, "GK", 2) == 0) {
 592                 char *base64_key;
 593                 DEBUG(10, ("Requested session key\n"));
 594                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 595                 if(!NT_STATUS_IS_OK(nt_status)) {
 596                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 597                         mux_printf(mux_id, "BH No session key\n");
 598                         talloc_free(mem_ctx);
 599                         return;
 600                 } else {
 601                         base64_key = base64_encode_data_blob(state, session_key);
 602                         mux_printf(mux_id, "GK %s\n", base64_key);
 603                         talloc_free(base64_key);
 604                 }
 605                 talloc_free(mem_ctx);
 606                 return;
 607         }
 608
 609         if (strncmp(buf, "GF", 2) == 0) {
 610                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 611                 uint32_t neg_flags;
 612
 613                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 614                                 struct gensec_ntlmssp_state);
 615                 neg_flags = gensec_ntlmssp_state->neg_flags;
 616
 617                 DEBUG(10, ("Requested negotiated feature flags\n"));
 618                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 619                 return;
 620         }
 621
 622         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 623
 624         /* don't leak 'bad password'/'no such user' info to the network client */
 625         nt_status = auth_nt_status_squash(nt_status);
 626
 627         if (out.length) {
 628                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 629         } else {
 630                 out_base64 = NULL;
 631         }
 632
 633         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 634                 reply_arg = "*";
 635                 if (first) {
 636                         reply_code = "YR";
 637                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 638                         reply_code = "KK";
 639                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 640                         reply_code = "TT";
 641                 } else {
 642                         abort();
 643                 }
 644
 645
 646         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 647                 reply_code = "BH";
 648                 reply_arg = nt_errstr(nt_status);
 649                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 650         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 651                 reply_code = "BH";
 652                 reply_arg = nt_errstr(nt_status);
 653                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 654         } else if (!NT_STATUS_IS_OK(nt_status)) {
 655                 reply_code = "NA";
 656                 reply_arg = nt_errstr(nt_status);
 657                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 658         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 659                 struct auth_session_info *session_info;
 660
 661                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 662                 if (!NT_STATUS_IS_OK(nt_status)) {
 663                         reply_code = "BH";
 664                         reply_arg = nt_errstr(nt_status);
 665                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 666                 } else {
 667
 668                         reply_code = "AF";
 669                         reply_arg = talloc_asprintf(state->gensec_state,
 670                                                     "%s%s%s", session_info->server_info->domain_name,
 671                                                     lp_winbind_separator(global_loadparm), session_info->server_info->account_name);
 672                         talloc_free(session_info);
 673                 }
 674         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 675                 reply_code = "AF";
 676                 reply_arg = out_base64;
 677         } else {
 678                 abort();
 679         }
 680
 681         switch (stdio_helper_mode) {
 682         case GSS_SPNEGO_SERVER:
 683                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 684                           out_base64 ? out_base64 : "*",
 685                           reply_arg ? reply_arg : "*");
 686                 break;
 687         default:
 688                 if (out_base64) {
 689                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 690                 } else if (reply_arg) {
 691                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 692                 } else {
 693                         mux_printf(mux_id, "%s\n", reply_code);
 694                 }
 695         }
 696
 697         talloc_free(mem_ctx);
 698         return;
 699 }
 700
 701 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 702                                          struct loadparm_context *lp_ctx,
 703                                          char *buf, int length, void **private,
 704                                          unsigned int mux_id, void **private2)
 705 {
 706         char *request, *parameter;
 707         static DATA_BLOB challenge;
 708         static DATA_BLOB lm_response;
 709         static DATA_BLOB nt_response;
 710         static char *full_username;
 711         static char *username;
 712         static char *domain;
 713         static char *plaintext_password;
 714         static bool ntlm_server_1_user_session_key;
 715         static bool ntlm_server_1_lm_session_key;
 716
 717         if (strequal(buf, ".")) {
 718                 if (!full_username && !username) {
 719                         mux_printf(mux_id, "Error: No username supplied!\n");
 720                 } else if (plaintext_password) {
 721                         /* handle this request as plaintext */
 722                         if (!full_username) {
 723                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(lp_ctx), username) == -1) {
 724                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 725                                         return;
 726                                 }
 727                         }
 728                         if (check_plaintext_auth(full_username, plaintext_password, false)) {
 729                                 mux_printf(mux_id, "Authenticated: Yes\n");
 730                         } else {
 731                                 mux_printf(mux_id, "Authenticated: No\n");
 732                         }
 733                 } else if (!lm_response.data && !nt_response.data) {
 734                         mux_printf(mux_id, "Error: No password supplied!\n");
 735                 } else if (!challenge.data) {
 736                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 737                 } else {
 738                         char *error_string = NULL;
 739                         DATA_BLOB lm_key;
 740                         DATA_BLOB user_session_key;
 741                         uint32_t flags = 0;
 742
 743                         if (full_username && !username) {
 744                                 fstring fstr_user;
 745                                 fstring fstr_domain;
 746
 747                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 748                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 749                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 750                                 }
 751                                 SAFE_FREE(username);
 752                                 SAFE_FREE(domain);
 753                                 username = smb_xstrdup(fstr_user);
 754                                 domain = smb_xstrdup(fstr_domain);
 755                         }
 756
 757                         if (!domain) {
 758                                 domain = smb_xstrdup(lp_workgroup(lp_ctx));
 759                         }
 760
 761                         if (ntlm_server_1_lm_session_key)
 762                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 763
 764                         if (ntlm_server_1_user_session_key)
 765                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 766
 767                         if (!NT_STATUS_IS_OK(
 768                                     local_pw_check_specified(lp_ctx,
 769                                                              username,
 770                                                               domain,
 771                                                               lp_netbios_name(lp_ctx),
 772                                                               &challenge,
 773                                                               &lm_response,
 774                                                               &nt_response,
 775                                                               flags,
 776                                                               &lm_key,
 777                                                               &user_session_key,
 778                                                               &error_string,
 779                                                               NULL))) {
 780
 781                                 mux_printf(mux_id, "Authenticated: No\n");
 782                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 783                                 SAFE_FREE(error_string);
 784                         } else {
 785                                 static char zeros[16];
 786                                 char *hex_lm_key;
 787                                 char *hex_user_session_key;
 788
 789                                 mux_printf(mux_id, "Authenticated: Yes\n");
 790
 791                                 if (ntlm_server_1_lm_session_key
 792                                     && lm_key.length
 793                                     && (memcmp(zeros, lm_key.data,
 794                                                                 lm_key.length) != 0)) {
 795                                         hex_encode(lm_key.data,
 796                                                    lm_key.length,
 797                                                    &hex_lm_key);
 798                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 799                                         SAFE_FREE(hex_lm_key);
 800                                 }
 801
 802                                 if (ntlm_server_1_user_session_key
 803                                     && user_session_key.length
 804                                     && (memcmp(zeros, user_session_key.data,
 805                                                user_session_key.length) != 0)) {
 806                                         hex_encode(user_session_key.data,
 807                                                    user_session_key.length,
 808                                                    &hex_user_session_key);
 809                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 810                                         SAFE_FREE(hex_user_session_key);
 811                                 }
 812                         }
 813                 }
 814                 /* clear out the state */
 815                 challenge = data_blob(NULL, 0);
 816                 nt_response = data_blob(NULL, 0);
 817                 lm_response = data_blob(NULL, 0);
 818                 SAFE_FREE(full_username);
 819                 SAFE_FREE(username);
 820                 SAFE_FREE(domain);
 821                 SAFE_FREE(plaintext_password);
 822                 ntlm_server_1_user_session_key = false;
 823                 ntlm_server_1_lm_session_key = false;
 824                 mux_printf(mux_id, ".\n");
 825
 826                 return;
 827         }
 828
 829         request = buf;
 830
 831         /* Indicates a base64 encoded structure */
 832         parameter = strstr(request, ":: ");
 833         if (!parameter) {
 834                 parameter = strstr(request, ": ");
 835
 836                 if (!parameter) {
 837                         DEBUG(0, ("Parameter not found!\n"));
 838                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 839                         return;
 840                 }
 841
 842                 parameter[0] ='\0';
 843                 parameter++;
 844                 parameter[0] ='\0';
 845                 parameter++;
 846
 847         } else {
 848                 parameter[0] ='\0';
 849                 parameter++;
 850                 parameter[0] ='\0';
 851                 parameter++;
 852                 parameter[0] ='\0';
 853                 parameter++;
 854
 855                 base64_decode_inplace(parameter);
 856         }
 857
 858         if (strequal(request, "LANMAN-Challenge")) {
 859                 challenge = strhex_to_data_blob(parameter);
 860                 if (challenge.length != 8) {
 861                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 862                                   parameter,
 863                                   (int)challenge.length);
 864                         challenge = data_blob(NULL, 0);
 865                 }
 866         } else if (strequal(request, "NT-Response")) {
 867                 nt_response = strhex_to_data_blob(parameter);
 868                 if (nt_response.length < 24) {
 869                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 870                                   parameter,
 871                                   (int)nt_response.length);
 872                         nt_response = data_blob(NULL, 0);
 873                 }
 874         } else if (strequal(request, "LANMAN-Response")) {
 875                 lm_response = strhex_to_data_blob(parameter);
 876                 if (lm_response.length != 24) {
 877                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 878                                   parameter,
 879                                   (int)lm_response.length);
 880                         lm_response = data_blob(NULL, 0);
 881                 }
 882         } else if (strequal(request, "Password")) {
 883                 plaintext_password = smb_xstrdup(parameter);
 884         } else if (strequal(request, "NT-Domain")) {
 885                 domain = smb_xstrdup(parameter);
 886         } else if (strequal(request, "Username")) {
 887                 username = smb_xstrdup(parameter);
 888         } else if (strequal(request, "Full-Username")) {
 889                 full_username = smb_xstrdup(parameter);
 890         } else if (strequal(request, "Request-User-Session-Key")) {
 891                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 892         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 893                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 894         } else {
 895                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 896         }
 897 }
 898
 899 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 900                                  stdio_helper_function fn, void **private2)
 901 {
 902         char *buf;
 903         char tmp[INITIAL_BUFFER_SIZE+1];
 904         unsigned int mux_id = 0;
 905         int length, buf_size = 0;
 906         char *c;
 907         struct mux_private {
 908                 unsigned int max_mux;
 909                 void **private_pointers;
 910         };
 911
 912         static struct mux_private *mux_private;
 913         static void *normal_private;
 914         void **private;
 915
 916         buf = talloc_strdup(NULL, "");
 917
 918         if (buf == NULL) {
 919                 DEBUG(0, ("Failed to allocate memory for reading the input "
 920                           "buffer.\n"));
 921                 x_fprintf(x_stdout, "ERR\n");
 922                 return;
 923         }
 924
 925         do {
 926                 /* this is not a typo - x_fgets doesn't work too well under
 927                  * squid */
 928                 if (fgets(tmp, INITIAL_BUFFER_SIZE, stdin) == NULL) {
 929                         if (ferror(stdin)) {
 930                                 DEBUG(1, ("fgets() failed! dying..... errno=%d "
 931                                           "(%s)\n", ferror(stdin),
 932                                           strerror(ferror(stdin))));
 933
 934                                 exit(1);    /* BIIG buffer */
 935                         }
 936                         exit(0);
 937                 }
 938
 939                 buf = talloc_strdup_append_buffer(buf, tmp);
 940                 buf_size += INITIAL_BUFFER_SIZE;
 941
 942                 if (buf_size > MAX_BUFFER_SIZE) {
 943                         DEBUG(0, ("Invalid Request (too large)\n"));
 944                         x_fprintf(x_stdout, "ERR\n");
 945                         talloc_free(buf);
 946                         return;
 947                 }
 948
 949                 c = strchr(buf, '\n');
 950         } while (c == NULL);
 951
 952         *c = '\0';
 953         length = c-buf;
 954
 955         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 956
 957         if (buf[0] == '\0') {
 958                 DEBUG(0, ("Invalid Request (empty)\n"));
 959                 x_fprintf(x_stdout, "ERR\n");
 960                 talloc_free(buf);
 961                 return;
 962         }
 963
 964         if (opt_multiplex) {
 965                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 966                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 967                         x_fprintf(x_stdout, "ERR\n");
 968                         talloc_free(buf);
 969                         return;
 970                 }
 971                 if (!mux_private) {
 972                         mux_private = talloc(NULL, struct mux_private);
 973                         mux_private->max_mux = 0;
 974                         mux_private->private_pointers = NULL;
 975                 }
 976
 977                 c=strchr(buf,' ');
 978                 if (!c) {
 979                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 980                         x_fprintf(x_stdout, "ERR\n");
 981                         talloc_free(buf);
 982                         return;
 983                 }
 984                 c++;
 985                 if (mux_id >= mux_private->max_mux) {
 986                         unsigned int prev_max = mux_private->max_mux;
 987                         mux_private->max_mux = mux_id + 1;
 988                         mux_private->private_pointers
 989                                 = talloc_realloc(mux_private,
 990                                                    mux_private->private_pointers,
 991                                                    void *, mux_private->max_mux);
 992                         memset(&mux_private->private_pointers[prev_max], '\0',
 993                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 994                 };
 995
 996                 private = &mux_private->private_pointers[mux_id];
 997         } else {
 998                 c = buf;
 999                 private = &normal_private;
1000         }
1001
1002         fn(helper_mode, global_loadparm, c, length, private, mux_id, private2);
1003         talloc_free(buf);
1004 }
1005
1006 static void squid_stream(enum stdio_helper_mode stdio_mode,
1007                          stdio_helper_function fn) {
1008         /* initialize FDescs */
1009         x_setbuf(x_stdout, NULL);
1010         x_setbuf(x_stderr, NULL);
1011         while(1) {
1012                 manage_squid_request(stdio_mode, fn, NULL);
1013         }
1014 }
1015
1016
1017 /* Main program */
1018
1019 enum {
1020         OPT_USERNAME = 1000,
1021         OPT_DOMAIN,
1022         OPT_WORKSTATION,
1023         OPT_CHALLENGE,
1024         OPT_RESPONSE,
1025         OPT_LM,
1026         OPT_NT,
1027         OPT_PASSWORD,
1028         OPT_LM_KEY,
1029         OPT_USER_SESSION_KEY,
1030         OPT_DIAGNOSTICS,
1031         OPT_REQUIRE_MEMBERSHIP,
1032         OPT_MULTIPLEX,
1033         OPT_USE_CACHED_CREDS,
1034 };
1035
1036 int main(int argc, const char **argv)
1037 {
1038         static const char *helper_protocol;
1039         int opt;
1040
1041         poptContext pc;
1042
1043         /* NOTE: DO NOT change this interface without considering the implications!
1044            This is an external interface, which other programs will use to interact
1045            with this helper.
1046         */
1047
1048         /* We do not use single-letter command abbreviations, because they harm future
1049            interface stability. */
1050
1051         struct poptOption long_options[] = {
1052                 POPT_AUTOHELP
1053                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1054                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1055                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1056                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1057                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1058                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1059                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1060                 POPT_COMMON_SAMBA
1061                 POPT_COMMON_VERSION
1062                 { NULL }
1063         };
1064
1065         /* Samba client initialisation */
1066
1067         setup_logging(NULL, DEBUG_STDERR);
1068
1069         /* Parse options */
1070
1071         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1072
1073         /* Parse command line options */
1074
1075         if (argc == 1) {
1076                 poptPrintHelp(pc, stderr, 0);
1077                 return 1;
1078         }
1079
1080         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1081                             POPT_CONTEXT_KEEP_FIRST);
1082
1083         while((opt = poptGetNextOpt(pc)) != -1) {
1084                 if (opt < -1) {
1085                         break;
1086                 }
1087         }
1088         if (opt < -1) {
1089                 fprintf(stderr, "%s: %s\n",
1090                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1091                         poptStrerror(opt));
1092                 return 1;
1093         }
1094
1095         gensec_init(global_loadparm);
1096
1097         if (opt_domain == NULL) {
1098                 opt_domain = lp_workgroup(global_loadparm);
1099         }
1100
1101         if (helper_protocol) {
1102                 int i;
1103                 for (i=0; i<NUM_HELPER_MODES; i++) {
1104                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1105                                 squid_stream(stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1106                                 exit(0);
1107                         }
1108                 }
1109                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1110
1111                 for (i=0; i<NUM_HELPER_MODES; i++) {
1112                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1113                 }
1114
1115                 exit(1);
1116         }
1117
1118         if (!opt_username) {
1119                 x_fprintf(x_stderr, "username must be specified!\n\n");
1120                 poptPrintHelp(pc, stderr, 0);
1121                 exit(1);
1122         }
1123
1124         if (opt_workstation == NULL) {
1125                 opt_workstation = lp_netbios_name(global_loadparm);
1126         }
1127
1128         if (!opt_password) {
1129                 opt_password = getpass("password: ");
1130         }
1131
1132         {
1133                 char *user;
1134
1135                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(global_loadparm), opt_username);
1136                 if (!check_plaintext_auth(user, opt_password, true)) {
1137                         return 1;
1138                 }
1139         }
1140
1141         /* Exit code */
1142
1143         poptFreeContext(pc);
1144         return 0;
1145 }