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
  41 #define INITIAL_BUFFER_SIZE 300
  42 #define MAX_BUFFER_SIZE 63000
  43
  44 enum stdio_helper_mode {
  45         SQUID_2_4_BASIC,
  46         SQUID_2_5_BASIC,
  47         SQUID_2_5_NTLMSSP,
  48         NTLMSSP_CLIENT_1,
  49         GSS_SPNEGO_CLIENT,
  50         GSS_SPNEGO_SERVER,
  51         NTLM_SERVER_1,
  52         NUM_HELPER_MODES
  53 };
  54
  55 #define NTLM_AUTH_FLAG_USER_SESSION_KEY     0x0004
  56 #define NTLM_AUTH_FLAG_LMKEY                0x0008
  57
  58
  59 typedef void (*stdio_helper_function)(enum stdio_helper_mode stdio_helper_mode,
  60                                       char *buf, int length, void **private,
  61                                       unsigned int mux_id, void **private2);
  62
  63 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  64                                         char *buf, int length, void **private,
  65                                         unsigned int mux_id, void **private2);
  66
  67 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  68                                    char *buf, int length, void **private,
  69                                    unsigned int mux_id, void **private2);
  70
  71 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  72                                           char *buf, int length, void **private,
  73                                           unsigned int mux_id, void **private2);
  74
  75 static void manage_squid_request(enum stdio_helper_mode helper_mode,
  76                                  stdio_helper_function fn, void **private2);
  77
  78 static const struct {
  79         enum stdio_helper_mode mode;
  80         const char *name;
  81         stdio_helper_function fn;
  82 } stdio_helper_protocols[] = {
  83         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  84         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  85         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  86         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  87         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  88         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  89         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  90         { NUM_HELPER_MODES, NULL, NULL}
  91 };
  92
  93 extern int winbindd_fd;
  94
  95 static const char *opt_username;
  96 static const char *opt_domain;
  97 static const char *opt_workstation;
  98 static const char *opt_password;
  99 static int opt_multiplex;
 100 static int use_cached_creds;
 101
 102
 103 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 104
 105 static void mux_printf(unsigned int mux_id, const char *format, ...)
 106 {
 107         va_list ap;
 108
 109         if (opt_multiplex) {
 110                 x_fprintf(x_stdout, "%d ", mux_id);
 111         }
 112
 113         va_start(ap, format);
 114         x_vfprintf(x_stdout, format, ap);
 115         va_end(ap);
 116 }
 117
 118
 119
 120 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 121    form DOMAIN/user into a domain and a user */
 122
 123 static bool parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 124                                         fstring user)
 125 {
 126
 127         char *p = strchr(domuser,*lp_winbind_separator());
 128
 129         if (!p) {
 130                 return False;
 131         }
 132
 133         fstrcpy(user, p+1);
 134         fstrcpy(domain, domuser);
 135         domain[PTR_DIFF(p, domuser)] = 0;
 136
 137         return True;
 138 }
 139
 140 /**
 141  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 142  **/
 143 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 144 {
 145         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 146         ret.length = ldb_base64_decode((char *)ret.data);
 147         return ret;
 148 }
 149
 150 /**
 151  * Encode a base64 string into a talloc()ed string caller to free.
 152  **/
 153 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 154 {
 155         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 156 }
 157
 158 /**
 159  * Decode a base64 string in-place - wrapper for the above
 160  **/
 161 static void base64_decode_inplace(char *s)
 162 {
 163         ldb_base64_decode(s);
 164 }
 165
 166
 167
 168 /* Authenticate a user with a plaintext password */
 169
 170 static BOOL check_plaintext_auth(const char *user, const char *pass,
 171                                  BOOL stdout_diagnostics)
 172 {
 173         return (strcmp(pass, opt_password) == 0);
 174 }
 175
 176 /* authenticate a user with an encrypted username/password */
 177
 178 static NTSTATUS local_pw_check_specified(const char *username,
 179                                          const char *domain,
 180                                          const char *workstation,
 181                                          const DATA_BLOB *challenge,
 182                                          const DATA_BLOB *lm_response,
 183                                          const DATA_BLOB *nt_response,
 184                                          uint32_t flags,
 185                                          DATA_BLOB *lm_session_key,
 186                                          DATA_BLOB *user_session_key,
 187                                          char **error_string,
 188                                          char **unix_name)
 189 {
 190         NTSTATUS nt_status;
 191         struct samr_Password lm_pw, nt_pw;
 192         struct samr_Password *lm_pwd, *nt_pwd;
 193         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 194         if (!mem_ctx) {
 195                 nt_status = NT_STATUS_NO_MEMORY;
 196         } else {
 197
 198                 E_md4hash(opt_password, nt_pw.hash);
 199                 if (E_deshash(opt_password, lm_pw.hash)) {
 200                         lm_pwd = &lm_pw;
 201                 } else {
 202                         lm_pwd = NULL;
 203                 }
 204                 nt_pwd = &nt_pw;
 205
 206
 207                 nt_status = ntlm_password_check(mem_ctx,
 208                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 209                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 210                                                 challenge,
 211                                                 lm_response,
 212                                                 nt_response,
 213                                                 username,
 214                                                 username,
 215                                                 domain,
 216                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 217
 218                 if (NT_STATUS_IS_OK(nt_status)) {
 219                         if (unix_name) {
 220                                 asprintf(unix_name,
 221                                          "%s%c%s", domain,
 222                                          *lp_winbind_separator(),
 223                                          username);
 224                         }
 225                 } else {
 226                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 227                                   domain, username, workstation,
 228                                   nt_errstr(nt_status)));
 229                 }
 230                 talloc_free(mem_ctx);
 231         }
 232         if (error_string) {
 233                 *error_string = strdup(nt_errstr(nt_status));
 234         }
 235         return nt_status;
 236
 237
 238 }
 239
 240 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 241                                        char *buf, int length, void **private,
 242                                        unsigned int mux_id, void **private2)
 243 {
 244         char *user, *pass;
 245         user=buf;
 246
 247         pass = memchr(buf, ' ', length);
 248         if (!pass) {
 249                 DEBUG(2, ("Password not found. Denying access\n"));
 250                 mux_printf(mux_id, "ERR\n");
 251                 return;
 252         }
 253         *pass='\0';
 254         pass++;
 255
 256         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 257                 rfc1738_unescape(user);
 258                 rfc1738_unescape(pass);
 259         }
 260
 261         if (check_plaintext_auth(user, pass, False)) {
 262                 mux_printf(mux_id, "OK\n");
 263         } else {
 264                 mux_printf(mux_id, "ERR\n");
 265         }
 266 }
 267
 268 /* This is a bit hairy, but the basic idea is to do a password callback
 269    to the calling application.  The callback comes from within gensec */
 270
 271 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 272                                          char *buf, int length, void **private,
 273                                          unsigned int mux_id, void **password)
 274 {
 275         DATA_BLOB in;
 276         if (strlen(buf) < 2) {
 277                 DEBUG(1, ("query [%s] invalid", buf));
 278                 mux_printf(mux_id, "BH\n");
 279                 return;
 280         }
 281
 282         if (strlen(buf) > 3) {
 283                 in = base64_decode_data_blob(NULL, buf + 3);
 284         } else {
 285                 in = data_blob(NULL, 0);
 286         }
 287
 288         if (strncmp(buf, "PW ", 3) == 0) {
 289
 290                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 291                                            (const char *)in.data, in.length);
 292
 293                 if (*password == NULL) {
 294                         DEBUG(1, ("Out of memory\n"));
 295                         mux_printf(mux_id, "BH\n");
 296                         data_blob_free(&in);
 297                         return;
 298                 }
 299
 300                 mux_printf(mux_id, "OK\n");
 301                 data_blob_free(&in);
 302                 return;
 303         }
 304         DEBUG(1, ("Asked for (and expected) a password\n"));
 305         mux_printf(mux_id, "BH\n");
 306         data_blob_free(&in);
 307 }
 308
 309 /**
 310  * Callback for password credentails.  This is not async, and when
 311  * GENSEC and the credentails code is made async, it will look rather
 312  * different.
 313  */
 314
 315 static const char *get_password(struct cli_credentials *credentials)
 316 {
 317         char *password = NULL;
 318
 319         /* Ask for a password */
 320         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 321         credentials->priv_data = NULL;
 322
 323         manage_squid_request(NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 324         return password;
 325 }
 326
 327 /**
 328  Check if a string is part of a list.
 329 **/
 330 static bool in_list(const char *s, const char *list, bool casesensitive)
 331 {
 332         pstring tok;
 333         const char *p=list;
 334
 335         if (!list)
 336                 return false;
 337
 338         while (next_token(&p, tok, LIST_SEP, sizeof(tok))) {
 339                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0)
 340                         return true;
 341         }
 342         return false;
 343 }
 344
 345 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 346 {
 347         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, True)) {
 348                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 349                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 350         }
 351         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, True)) {
 352                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 353                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 354         }
 355         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, True)) {
 356                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 357                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 358         }
 359 }
 360
 361 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 362                                   char *buf, int length, void **private,
 363                                   unsigned int mux_id, void **private2)
 364 {
 365         DATA_BLOB in;
 366         DATA_BLOB out = data_blob(NULL, 0);
 367         char *out_base64 = NULL;
 368         const char *reply_arg = NULL;
 369         struct gensec_ntlm_state {
 370                 struct gensec_security *gensec_state;
 371                 const char *set_password;
 372         };
 373         struct gensec_ntlm_state *state;
 374         struct event_context *ev;
 375         struct messaging_context *msg;
 376
 377         NTSTATUS nt_status;
 378         BOOL first = False;
 379         const char *reply_code;
 380         struct cli_credentials *creds;
 381
 382         static char *want_feature_list = NULL;
 383         static DATA_BLOB session_key;
 384
 385         TALLOC_CTX *mem_ctx;
 386
 387         if (*private) {
 388                 state = (struct gensec_ntlm_state *)*private;
 389         } else {
 390                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 391                 if (!state) {
 392                         mux_printf(mux_id, "BH No Memory\n");
 393                         exit(1);
 394                 }
 395                 *private = state;
 396                 if (opt_password) {
 397                         state->set_password = opt_password;
 398                 }
 399         }
 400
 401         if (strlen(buf) < 2) {
 402                 DEBUG(1, ("query [%s] invalid", buf));
 403                 mux_printf(mux_id, "BH\n");
 404                 return;
 405         }
 406
 407         if (strlen(buf) > 3) {
 408                 if(strncmp(buf, "SF ", 3) == 0) {
 409                         DEBUG(10, ("Setting flags to negotiate\n"));
 410                         talloc_free(want_feature_list);
 411                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 412                         mux_printf(mux_id, "OK\n");
 413                         return;
 414                 }
 415                 in = base64_decode_data_blob(NULL, buf + 3);
 416         } else {
 417                 in = data_blob(NULL, 0);
 418         }
 419
 420         if (strncmp(buf, "YR", 2) == 0) {
 421                 if (state->gensec_state) {
 422                         talloc_free(state->gensec_state);
 423                         state->gensec_state = NULL;
 424                 }
 425         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 426                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 427                 mux_printf(mux_id, "BH\n");
 428                 data_blob_free(&in);
 429                 return;
 430         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 431                     (strncmp(buf, "KK ", 3) != 0) &&
 432                     (strncmp(buf, "AF ", 3) != 0) &&
 433                     (strncmp(buf, "NA ", 3) != 0) &&
 434                     (strncmp(buf, "UG", 2) != 0) &&
 435                     (strncmp(buf, "PW ", 3) != 0) &&
 436                     (strncmp(buf, "GK", 2) != 0) &&
 437                     (strncmp(buf, "GF", 2) != 0)) {
 438                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 439                 mux_printf(mux_id, "BH\n");
 440                 data_blob_free(&in);
 441                 return;
 442         }
 443
 444         /* setup gensec */
 445         if (!(state->gensec_state)) {
 446                 switch (stdio_helper_mode) {
 447                 case GSS_SPNEGO_CLIENT:
 448                 case NTLMSSP_CLIENT_1:
 449                         /* setup the client side */
 450
 451                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL);
 452                         if (!NT_STATUS_IS_OK(nt_status)) {
 453                                 exit(1);
 454                         }
 455
 456                         break;
 457                 case GSS_SPNEGO_SERVER:
 458                 case SQUID_2_5_NTLMSSP:
 459                         ev = event_context_init(state);
 460                         if (!ev) {
 461                                 exit(1);
 462                         }
 463                         msg = messaging_client_init(state, ev);
 464                         if (!msg) {
 465                                 exit(1);
 466                         }
 467                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev, msg, &state->gensec_state))) {
 468                                 exit(1);
 469                         }
 470                         break;
 471                 default:
 472                         abort();
 473                 }
 474
 475                 creds = cli_credentials_init(state->gensec_state);
 476                 cli_credentials_set_conf(creds);
 477                 if (opt_username) {
 478                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 479                 }
 480                 if (opt_domain) {
 481                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 482                 }
 483                 if (state->set_password) {
 484                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 485                 } else {
 486                         cli_credentials_set_password_callback(creds, get_password);
 487                         creds->priv_data = (void*)mux_id;
 488                 }
 489                 if (opt_workstation) {
 490                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 491                 }
 492
 493                 switch (stdio_helper_mode) {
 494                 case GSS_SPNEGO_SERVER:
 495                 case SQUID_2_5_NTLMSSP:
 496                         cli_credentials_set_machine_account(creds);
 497                         break;
 498                 default:
 499                         break;
 500                 }
 501
 502                 gensec_set_credentials(state->gensec_state, creds);
 503                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 504
 505                 switch (stdio_helper_mode) {
 506                 case GSS_SPNEGO_CLIENT:
 507                 case GSS_SPNEGO_SERVER:
 508                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 509                         if (!in.length) {
 510                                 first = True;
 511                         }
 512                         break;
 513                 case NTLMSSP_CLIENT_1:
 514                         if (!in.length) {
 515                                 first = True;
 516                         }
 517                         /* fall through */
 518                 case SQUID_2_5_NTLMSSP:
 519                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 520                         break;
 521                 default:
 522                         abort();
 523                 }
 524
 525                 if (!NT_STATUS_IS_OK(nt_status)) {
 526                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 527                         mux_printf(mux_id, "BH\n");
 528                         return;
 529                 }
 530
 531         }
 532
 533         /* update */
 534         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 535
 536         if (strncmp(buf, "PW ", 3) == 0) {
 537                 state->set_password = talloc_strndup(state,
 538                                                      (const char *)in.data,
 539                                                      in.length);
 540
 541                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 542                                              state->set_password,
 543                                              CRED_SPECIFIED);
 544                 mux_printf(mux_id, "OK\n");
 545                 data_blob_free(&in);
 546                 talloc_free(mem_ctx);
 547                 return;
 548         }
 549
 550         if (strncmp(buf, "UG", 2) == 0) {
 551                 int i;
 552                 char *grouplist = NULL;
 553                 struct auth_session_info *session_info;
 554
 555                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 556                 if (!NT_STATUS_IS_OK(nt_status)) {
 557                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 558                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 559                         data_blob_free(&in);
 560                         talloc_free(mem_ctx);
 561                         return;
 562                 }
 563
 564                 /* get the string onto the context */
 565                 grouplist = talloc_strdup(mem_ctx, "");
 566
 567                 for (i=0; i<session_info->security_token->num_sids; i++) {
 568                         struct security_token *token = session_info->security_token;
 569                         const char *sidstr = dom_sid_string(session_info,
 570                                                             token->sids[i]);
 571                         grouplist = talloc_asprintf_append(grouplist, "%s,", sidstr);
 572                 }
 573
 574                 mux_printf(mux_id, "GL %s\n", grouplist);
 575                 talloc_free(session_info);
 576                 data_blob_free(&in);
 577                 talloc_free(mem_ctx);
 578                 return;
 579         }
 580
 581         if (strncmp(buf, "GK", 2) == 0) {
 582                 char *base64_key;
 583                 DEBUG(10, ("Requested session key\n"));
 584                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 585                 if(!NT_STATUS_IS_OK(nt_status)) {
 586                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 587                         mux_printf(mux_id, "BH No session key\n");
 588                         talloc_free(mem_ctx);
 589                         return;
 590                 } else {
 591                         base64_key = base64_encode_data_blob(state, session_key);
 592                         mux_printf(mux_id, "GK %s\n", base64_key);
 593                         talloc_free(base64_key);
 594                 }
 595                 talloc_free(mem_ctx);
 596                 return;
 597         }
 598
 599         if (strncmp(buf, "GF", 2) == 0) {
 600                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 601                 uint32_t neg_flags;
 602
 603                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 604                                 struct gensec_ntlmssp_state);
 605                 neg_flags = gensec_ntlmssp_state->neg_flags;
 606
 607                 DEBUG(10, ("Requested negotiated feature flags\n"));
 608                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 609                 return;
 610         }
 611
 612         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 613
 614         /* don't leak 'bad password'/'no such user' info to the network client */
 615         nt_status = auth_nt_status_squash(nt_status);
 616
 617         if (out.length) {
 618                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 619         } else {
 620                 out_base64 = NULL;
 621         }
 622
 623         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 624                 reply_arg = "*";
 625                 if (first) {
 626                         reply_code = "YR";
 627                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 628                         reply_code = "KK";
 629                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 630                         reply_code = "TT";
 631                 } else {
 632                         abort();
 633                 }
 634
 635
 636         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 637                 reply_code = "BH";
 638                 reply_arg = nt_errstr(nt_status);
 639                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 640         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 641                 reply_code = "BH";
 642                 reply_arg = nt_errstr(nt_status);
 643                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 644         } else if (!NT_STATUS_IS_OK(nt_status)) {
 645                 reply_code = "NA";
 646                 reply_arg = nt_errstr(nt_status);
 647                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 648         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 649                 struct auth_session_info *session_info;
 650
 651                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 652                 if (!NT_STATUS_IS_OK(nt_status)) {
 653                         reply_code = "BH";
 654                         reply_arg = nt_errstr(nt_status);
 655                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 656                 } else {
 657
 658                         reply_code = "AF";
 659                         reply_arg = talloc_asprintf(state->gensec_state,
 660                                                     "%s%s%s", session_info->server_info->domain_name,
 661                                                     lp_winbind_separator(), session_info->server_info->account_name);
 662                         talloc_free(session_info);
 663                 }
 664         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 665                 reply_code = "AF";
 666                 reply_arg = out_base64;
 667         } else {
 668                 abort();
 669         }
 670
 671         switch (stdio_helper_mode) {
 672         case GSS_SPNEGO_SERVER:
 673                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 674                           out_base64 ? out_base64 : "*",
 675                           reply_arg ? reply_arg : "*");
 676                 break;
 677         default:
 678                 if (out_base64) {
 679                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 680                 } else if (reply_arg) {
 681                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 682                 } else {
 683                         mux_printf(mux_id, "%s\n", reply_code);
 684                 }
 685         }
 686
 687         talloc_free(mem_ctx);
 688         return;
 689 }
 690
 691 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 692                                          char *buf, int length, void **private,
 693                                          unsigned int mux_id, void **private2)
 694 {
 695         char *request, *parameter;
 696         static DATA_BLOB challenge;
 697         static DATA_BLOB lm_response;
 698         static DATA_BLOB nt_response;
 699         static char *full_username;
 700         static char *username;
 701         static char *domain;
 702         static char *plaintext_password;
 703         static BOOL ntlm_server_1_user_session_key;
 704         static BOOL ntlm_server_1_lm_session_key;
 705
 706         if (strequal(buf, ".")) {
 707                 if (!full_username && !username) {
 708                         mux_printf(mux_id, "Error: No username supplied!\n");
 709                 } else if (plaintext_password) {
 710                         /* handle this request as plaintext */
 711                         if (!full_username) {
 712                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(), username) == -1) {
 713                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 714                                         return;
 715                                 }
 716                         }
 717                         if (check_plaintext_auth(full_username, plaintext_password, False)) {
 718                                 mux_printf(mux_id, "Authenticated: Yes\n");
 719                         } else {
 720                                 mux_printf(mux_id, "Authenticated: No\n");
 721                         }
 722                 } else if (!lm_response.data && !nt_response.data) {
 723                         mux_printf(mux_id, "Error: No password supplied!\n");
 724                 } else if (!challenge.data) {
 725                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 726                 } else {
 727                         char *error_string = NULL;
 728                         DATA_BLOB lm_key;
 729                         DATA_BLOB user_session_key;
 730                         uint32_t flags = 0;
 731
 732                         if (full_username && !username) {
 733                                 fstring fstr_user;
 734                                 fstring fstr_domain;
 735
 736                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain)) {
 737                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 738                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 739                                 }
 740                                 SAFE_FREE(username);
 741                                 SAFE_FREE(domain);
 742                                 username = smb_xstrdup(fstr_user);
 743                                 domain = smb_xstrdup(fstr_domain);
 744                         }
 745
 746                         if (!domain) {
 747                                 domain = smb_xstrdup(lp_workgroup());
 748                         }
 749
 750                         if (ntlm_server_1_lm_session_key)
 751                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 752
 753                         if (ntlm_server_1_user_session_key)
 754                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 755
 756                         if (!NT_STATUS_IS_OK(
 757                                     local_pw_check_specified(username,
 758                                                               domain,
 759                                                               lp_netbios_name(),
 760                                                               &challenge,
 761                                                               &lm_response,
 762                                                               &nt_response,
 763                                                               flags,
 764                                                               &lm_key,
 765                                                               &user_session_key,
 766                                                               &error_string,
 767                                                               NULL))) {
 768
 769                                 mux_printf(mux_id, "Authenticated: No\n");
 770                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 771                                 SAFE_FREE(error_string);
 772                         } else {
 773                                 static char zeros[16];
 774                                 char *hex_lm_key;
 775                                 char *hex_user_session_key;
 776
 777                                 mux_printf(mux_id, "Authenticated: Yes\n");
 778
 779                                 if (ntlm_server_1_lm_session_key
 780                                     && lm_key.length
 781                                     && (memcmp(zeros, lm_key.data,
 782                                                                 lm_key.length) != 0)) {
 783                                         hex_encode(lm_key.data,
 784                                                    lm_key.length,
 785                                                    &hex_lm_key);
 786                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 787                                         SAFE_FREE(hex_lm_key);
 788                                 }
 789
 790                                 if (ntlm_server_1_user_session_key
 791                                     && user_session_key.length
 792                                     && (memcmp(zeros, user_session_key.data,
 793                                                user_session_key.length) != 0)) {
 794                                         hex_encode(user_session_key.data,
 795                                                    user_session_key.length,
 796                                                    &hex_user_session_key);
 797                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 798                                         SAFE_FREE(hex_user_session_key);
 799                                 }
 800                         }
 801                 }
 802                 /* clear out the state */
 803                 challenge = data_blob(NULL, 0);
 804                 nt_response = data_blob(NULL, 0);
 805                 lm_response = data_blob(NULL, 0);
 806                 SAFE_FREE(full_username);
 807                 SAFE_FREE(username);
 808                 SAFE_FREE(domain);
 809                 SAFE_FREE(plaintext_password);
 810                 ntlm_server_1_user_session_key = False;
 811                 ntlm_server_1_lm_session_key = False;
 812                 mux_printf(mux_id, ".\n");
 813
 814                 return;
 815         }
 816
 817         request = buf;
 818
 819         /* Indicates a base64 encoded structure */
 820         parameter = strstr(request, ":: ");
 821         if (!parameter) {
 822                 parameter = strstr(request, ": ");
 823
 824                 if (!parameter) {
 825                         DEBUG(0, ("Parameter not found!\n"));
 826                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 827                         return;
 828                 }
 829
 830                 parameter[0] ='\0';
 831                 parameter++;
 832                 parameter[0] ='\0';
 833                 parameter++;
 834
 835         } else {
 836                 parameter[0] ='\0';
 837                 parameter++;
 838                 parameter[0] ='\0';
 839                 parameter++;
 840                 parameter[0] ='\0';
 841                 parameter++;
 842
 843                 base64_decode_inplace(parameter);
 844         }
 845
 846         if (strequal(request, "LANMAN-Challenge")) {
 847                 challenge = strhex_to_data_blob(parameter);
 848                 if (challenge.length != 8) {
 849                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 850                                   parameter,
 851                                   (int)challenge.length);
 852                         challenge = data_blob(NULL, 0);
 853                 }
 854         } else if (strequal(request, "NT-Response")) {
 855                 nt_response = strhex_to_data_blob(parameter);
 856                 if (nt_response.length < 24) {
 857                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 858                                   parameter,
 859                                   (int)nt_response.length);
 860                         nt_response = data_blob(NULL, 0);
 861                 }
 862         } else if (strequal(request, "LANMAN-Response")) {
 863                 lm_response = strhex_to_data_blob(parameter);
 864                 if (lm_response.length != 24) {
 865                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 866                                   parameter,
 867                                   (int)lm_response.length);
 868                         lm_response = data_blob(NULL, 0);
 869                 }
 870         } else if (strequal(request, "Password")) {
 871                 plaintext_password = smb_xstrdup(parameter);
 872         } else if (strequal(request, "NT-Domain")) {
 873                 domain = smb_xstrdup(parameter);
 874         } else if (strequal(request, "Username")) {
 875                 username = smb_xstrdup(parameter);
 876         } else if (strequal(request, "Full-Username")) {
 877                 full_username = smb_xstrdup(parameter);
 878         } else if (strequal(request, "Request-User-Session-Key")) {
 879                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 880         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 881                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 882         } else {
 883                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 884         }
 885 }
 886
 887 static void manage_squid_request(enum stdio_helper_mode helper_mode,
 888                                  stdio_helper_function fn, void **private2)
 889 {
 890         char *buf;
 891         char tmp[INITIAL_BUFFER_SIZE+1];
 892         unsigned int mux_id = 0;
 893         int length, buf_size = 0;
 894         char *c;
 895         struct mux_private {
 896                 unsigned int max_mux;
 897                 void **private_pointers;
 898         };
 899
 900         static struct mux_private *mux_private;
 901         static void *normal_private;
 902         void **private;
 903
 904         buf = talloc(NULL, char);
 905         buf[0] = '\0';
 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_append_string(buf, 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();
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();
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(), 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 }