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(struct loadparm_context *lp_ctx,
  81                                  enum stdio_helper_mode helper_mode,
  82                                  stdio_helper_function fn, void **private2);
  83
  84 static const struct {
  85         enum stdio_helper_mode mode;
  86         const char *name;
  87         stdio_helper_function fn;
  88 } stdio_helper_protocols[] = {
  89         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  90         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  91         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  92         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  93         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  94         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  95         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  96         { NUM_HELPER_MODES, NULL, NULL}
  97 };
  98
  99 extern int winbindd_fd;
 100
 101 static const char *opt_username;
 102 static const char *opt_domain;
 103 static const char *opt_workstation;
 104 static const char *opt_password;
 105 static int opt_multiplex;
 106 static int use_cached_creds;
 107
 108
 109 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 110
 111 static void mux_printf(unsigned int mux_id, const char *format, ...)
 112 {
 113         va_list ap;
 114
 115         if (opt_multiplex) {
 116                 x_fprintf(x_stdout, "%d ", mux_id);
 117         }
 118
 119         va_start(ap, format);
 120         x_vfprintf(x_stdout, format, ap);
 121         va_end(ap);
 122 }
 123
 124
 125
 126 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 127    form DOMAIN/user into a domain and a user */
 128
 129 static bool parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
 130                                         fstring user, char winbind_separator)
 131 {
 132
 133         char *p = strchr(domuser, winbind_separator);
 134
 135         if (!p) {
 136                 return false;
 137         }
 138
 139         fstrcpy(user, p+1);
 140         fstrcpy(domain, domuser);
 141         domain[PTR_DIFF(p, domuser)] = 0;
 142
 143         return true;
 144 }
 145
 146 /**
 147  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 148  **/
 149 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 150 {
 151         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 152         ret.length = ldb_base64_decode((char *)ret.data);
 153         return ret;
 154 }
 155
 156 /**
 157  * Encode a base64 string into a talloc()ed string caller to free.
 158  **/
 159 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 160 {
 161         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 162 }
 163
 164 /**
 165  * Decode a base64 string in-place - wrapper for the above
 166  **/
 167 static void base64_decode_inplace(char *s)
 168 {
 169         ldb_base64_decode(s);
 170 }
 171
 172
 173
 174 /* Authenticate a user with a plaintext password */
 175
 176 static bool check_plaintext_auth(const char *user, const char *pass,
 177                                  bool stdout_diagnostics)
 178 {
 179         return (strcmp(pass, opt_password) == 0);
 180 }
 181
 182 /* authenticate a user with an encrypted username/password */
 183
 184 static NTSTATUS local_pw_check_specified(struct loadparm_context *lp_ctx,
 185                                          const char *username,
 186                                          const char *domain,
 187                                          const char *workstation,
 188                                          const DATA_BLOB *challenge,
 189                                          const DATA_BLOB *lm_response,
 190                                          const DATA_BLOB *nt_response,
 191                                          uint32_t flags,
 192                                          DATA_BLOB *lm_session_key,
 193                                          DATA_BLOB *user_session_key,
 194                                          char **error_string,
 195                                          char **unix_name)
 196 {
 197         NTSTATUS nt_status;
 198         struct samr_Password lm_pw, nt_pw;
 199         struct samr_Password *lm_pwd, *nt_pwd;
 200         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 201         if (!mem_ctx) {
 202                 nt_status = NT_STATUS_NO_MEMORY;
 203         } else {
 204
 205                 E_md4hash(opt_password, nt_pw.hash);
 206                 if (E_deshash(opt_password, lm_pw.hash)) {
 207                         lm_pwd = &lm_pw;
 208                 } else {
 209                         lm_pwd = NULL;
 210                 }
 211                 nt_pwd = &nt_pw;
 212
 213
 214                 nt_status = ntlm_password_check(mem_ctx,
 215                                                 lp_ctx,
 216                                                 MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT |
 217                                                 MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT,
 218                                                 challenge,
 219                                                 lm_response,
 220                                                 nt_response,
 221                                                 username,
 222                                                 username,
 223                                                 domain,
 224                                                 lm_pwd, nt_pwd, user_session_key, lm_session_key);
 225
 226                 if (NT_STATUS_IS_OK(nt_status)) {
 227                         if (unix_name) {
 228                                 asprintf(unix_name,
 229                                          "%s%c%s", domain,
 230                                          *lp_winbind_separator(lp_ctx),
 231                                          username);
 232                         }
 233                 } else {
 234                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 235                                   domain, username, workstation,
 236                                   nt_errstr(nt_status)));
 237                 }
 238                 talloc_free(mem_ctx);
 239         }
 240         if (error_string) {
 241                 *error_string = strdup(nt_errstr(nt_status));
 242         }
 243         return nt_status;
 244
 245
 246 }
 247
 248 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 249                                        struct loadparm_context *lp_ctx,
 250                                        char *buf, int length, void **private,
 251                                        unsigned int mux_id, void **private2)
 252 {
 253         char *user, *pass;
 254         user=buf;
 255
 256         pass = memchr(buf, ' ', length);
 257         if (!pass) {
 258                 DEBUG(2, ("Password not found. Denying access\n"));
 259                 mux_printf(mux_id, "ERR\n");
 260                 return;
 261         }
 262         *pass='\0';
 263         pass++;
 264
 265         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 266                 rfc1738_unescape(user);
 267                 rfc1738_unescape(pass);
 268         }
 269
 270         if (check_plaintext_auth(user, pass, false)) {
 271                 mux_printf(mux_id, "OK\n");
 272         } else {
 273                 mux_printf(mux_id, "ERR\n");
 274         }
 275 }
 276
 277 /* This is a bit hairy, but the basic idea is to do a password callback
 278    to the calling application.  The callback comes from within gensec */
 279
 280 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 281                                          struct loadparm_context *lp_ctx,
 282                                          char *buf, int length, void **private,
 283                                          unsigned int mux_id, void **password)
 284 {
 285         DATA_BLOB in;
 286         if (strlen(buf) < 2) {
 287                 DEBUG(1, ("query [%s] invalid", buf));
 288                 mux_printf(mux_id, "BH\n");
 289                 return;
 290         }
 291
 292         if (strlen(buf) > 3) {
 293                 in = base64_decode_data_blob(NULL, buf + 3);
 294         } else {
 295                 in = data_blob(NULL, 0);
 296         }
 297
 298         if (strncmp(buf, "PW ", 3) == 0) {
 299
 300                 *password = talloc_strndup(*private /* hopefully the right gensec context, useful to use for talloc */,
 301                                            (const char *)in.data, in.length);
 302
 303                 if (*password == NULL) {
 304                         DEBUG(1, ("Out of memory\n"));
 305                         mux_printf(mux_id, "BH\n");
 306                         data_blob_free(&in);
 307                         return;
 308                 }
 309
 310                 mux_printf(mux_id, "OK\n");
 311                 data_blob_free(&in);
 312                 return;
 313         }
 314         DEBUG(1, ("Asked for (and expected) a password\n"));
 315         mux_printf(mux_id, "BH\n");
 316         data_blob_free(&in);
 317 }
 318
 319 /**
 320  * Callback for password credentials.  This is not async, and when
 321  * GENSEC and the credentials code is made async, it will look rather
 322  * different.
 323  */
 324
 325 static const char *get_password(struct cli_credentials *credentials)
 326 {
 327         char *password = NULL;
 328
 329         /* Ask for a password */
 330         mux_printf((unsigned int)credentials->priv_data, "PW\n");
 331         credentials->priv_data = NULL;
 332
 333         manage_squid_request(cmdline_lp_ctx, NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 334         return password;
 335 }
 336
 337 /**
 338  Check if a string is part of a list.
 339 **/
 340 static bool in_list(const char *s, const char *list, bool casesensitive)
 341 {
 342         pstring tok;
 343         const char *p=list;
 344
 345         if (!list)
 346                 return false;
 347
 348         while (next_token(&p, tok, LIST_SEP, sizeof(tok))) {
 349                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0)
 350                         return true;
 351         }
 352         return false;
 353 }
 354
 355 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 356 {
 357         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, true)) {
 358                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 359                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 360         }
 361         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, true)) {
 362                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 363                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 364         }
 365         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, true)) {
 366                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 367                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 368         }
 369 }
 370
 371 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 372                                   struct loadparm_context *lp_ctx,
 373                                   char *buf, int length, void **private,
 374                                   unsigned int mux_id, void **private2)
 375 {
 376         DATA_BLOB in;
 377         DATA_BLOB out = data_blob(NULL, 0);
 378         char *out_base64 = NULL;
 379         const char *reply_arg = NULL;
 380         struct gensec_ntlm_state {
 381                 struct gensec_security *gensec_state;
 382                 const char *set_password;
 383         };
 384         struct gensec_ntlm_state *state;
 385         struct event_context *ev;
 386         struct messaging_context *msg;
 387
 388         NTSTATUS nt_status;
 389         bool first = false;
 390         const char *reply_code;
 391         struct cli_credentials *creds;
 392
 393         static char *want_feature_list = NULL;
 394         static DATA_BLOB session_key;
 395
 396         TALLOC_CTX *mem_ctx;
 397
 398         if (*private) {
 399                 state = (struct gensec_ntlm_state *)*private;
 400         } else {
 401                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 402                 if (!state) {
 403                         mux_printf(mux_id, "BH No Memory\n");
 404                         exit(1);
 405                 }
 406                 *private = state;
 407                 if (opt_password) {
 408                         state->set_password = opt_password;
 409                 }
 410         }
 411
 412         if (strlen(buf) < 2) {
 413                 DEBUG(1, ("query [%s] invalid", buf));
 414                 mux_printf(mux_id, "BH\n");
 415                 return;
 416         }
 417
 418         if (strlen(buf) > 3) {
 419                 if(strncmp(buf, "SF ", 3) == 0) {
 420                         DEBUG(10, ("Setting flags to negotiate\n"));
 421                         talloc_free(want_feature_list);
 422                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 423                         mux_printf(mux_id, "OK\n");
 424                         return;
 425                 }
 426                 in = base64_decode_data_blob(NULL, buf + 3);
 427         } else {
 428                 in = data_blob(NULL, 0);
 429         }
 430
 431         if (strncmp(buf, "YR", 2) == 0) {
 432                 if (state->gensec_state) {
 433                         talloc_free(state->gensec_state);
 434                         state->gensec_state = NULL;
 435                 }
 436         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 437                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 438                 mux_printf(mux_id, "BH\n");
 439                 data_blob_free(&in);
 440                 return;
 441         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 442                     (strncmp(buf, "KK ", 3) != 0) &&
 443                     (strncmp(buf, "AF ", 3) != 0) &&
 444                     (strncmp(buf, "NA ", 3) != 0) &&
 445                     (strncmp(buf, "UG", 2) != 0) &&
 446                     (strncmp(buf, "PW ", 3) != 0) &&
 447                     (strncmp(buf, "GK", 2) != 0) &&
 448                     (strncmp(buf, "GF", 2) != 0)) {
 449                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 450                 mux_printf(mux_id, "BH\n");
 451                 data_blob_free(&in);
 452                 return;
 453         }
 454
 455         /* setup gensec */
 456         if (!(state->gensec_state)) {
 457                 switch (stdio_helper_mode) {
 458                 case GSS_SPNEGO_CLIENT:
 459                 case NTLMSSP_CLIENT_1:
 460                         /* setup the client side */
 461
 462                         nt_status = gensec_client_start(NULL, &state->gensec_state, NULL, lp_ctx);
 463                         if (!NT_STATUS_IS_OK(nt_status)) {
 464                                 exit(1);
 465                         }
 466
 467                         break;
 468                 case GSS_SPNEGO_SERVER:
 469                 case SQUID_2_5_NTLMSSP:
 470                         ev = event_context_init(state);
 471                         if (!ev) {
 472                                 exit(1);
 473                         }
 474                         msg = messaging_client_init(state, lp_messaging_path(state, lp_ctx), ev);
 475                         if (!msg) {
 476                                 exit(1);
 477                         }
 478                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev, lp_ctx, msg, &state->gensec_state))) {
 479                                 exit(1);
 480                         }
 481                         break;
 482                 default:
 483                         abort();
 484                 }
 485
 486                 creds = cli_credentials_init(state->gensec_state);
 487                 cli_credentials_set_conf(creds, lp_ctx);
 488                 if (opt_username) {
 489                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 490                 }
 491                 if (opt_domain) {
 492                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 493                 }
 494                 if (state->set_password) {
 495                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 496                 } else {
 497                         cli_credentials_set_password_callback(creds, get_password);
 498                         creds->priv_data = (void*)mux_id;
 499                 }
 500                 if (opt_workstation) {
 501                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 502                 }
 503
 504                 switch (stdio_helper_mode) {
 505                 case GSS_SPNEGO_SERVER:
 506                 case SQUID_2_5_NTLMSSP:
 507                         cli_credentials_set_machine_account(creds);
 508                         break;
 509                 default:
 510                         break;
 511                 }
 512
 513                 gensec_set_credentials(state->gensec_state, creds);
 514                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 515
 516                 switch (stdio_helper_mode) {
 517                 case GSS_SPNEGO_CLIENT:
 518                 case GSS_SPNEGO_SERVER:
 519                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 520                         if (!in.length) {
 521                                 first = true;
 522                         }
 523                         break;
 524                 case NTLMSSP_CLIENT_1:
 525                         if (!in.length) {
 526                                 first = true;
 527                         }
 528                         /* fall through */
 529                 case SQUID_2_5_NTLMSSP:
 530                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 531                         break;
 532                 default:
 533                         abort();
 534                 }
 535
 536                 if (!NT_STATUS_IS_OK(nt_status)) {
 537                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 538                         mux_printf(mux_id, "BH\n");
 539                         return;
 540                 }
 541
 542         }
 543
 544         /* update */
 545         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 546
 547         if (strncmp(buf, "PW ", 3) == 0) {
 548                 state->set_password = talloc_strndup(state,
 549                                                      (const char *)in.data,
 550                                                      in.length);
 551
 552                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 553                                              state->set_password,
 554                                              CRED_SPECIFIED);
 555                 mux_printf(mux_id, "OK\n");
 556                 data_blob_free(&in);
 557                 talloc_free(mem_ctx);
 558                 return;
 559         }
 560
 561         if (strncmp(buf, "UG", 2) == 0) {
 562                 int i;
 563                 char *grouplist = NULL;
 564                 struct auth_session_info *session_info;
 565
 566                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 567                 if (!NT_STATUS_IS_OK(nt_status)) {
 568                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 569                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 570                         data_blob_free(&in);
 571                         talloc_free(mem_ctx);
 572                         return;
 573                 }
 574
 575                 /* get the string onto the context */
 576                 grouplist = talloc_strdup(mem_ctx, "");
 577
 578                 for (i=0; i<session_info->security_token->num_sids; i++) {
 579                         struct security_token *token = session_info->security_token;
 580                         const char *sidstr = dom_sid_string(session_info,
 581                                                             token->sids[i]);
 582                         grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
 583                 }
 584
 585                 mux_printf(mux_id, "GL %s\n", grouplist);
 586                 talloc_free(session_info);
 587                 data_blob_free(&in);
 588                 talloc_free(mem_ctx);
 589                 return;
 590         }
 591
 592         if (strncmp(buf, "GK", 2) == 0) {
 593                 char *base64_key;
 594                 DEBUG(10, ("Requested session key\n"));
 595                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 596                 if(!NT_STATUS_IS_OK(nt_status)) {
 597                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 598                         mux_printf(mux_id, "BH No session key\n");
 599                         talloc_free(mem_ctx);
 600                         return;
 601                 } else {
 602                         base64_key = base64_encode_data_blob(state, session_key);
 603                         mux_printf(mux_id, "GK %s\n", base64_key);
 604                         talloc_free(base64_key);
 605                 }
 606                 talloc_free(mem_ctx);
 607                 return;
 608         }
 609
 610         if (strncmp(buf, "GF", 2) == 0) {
 611                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 612                 uint32_t neg_flags;
 613
 614                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 615                                 struct gensec_ntlmssp_state);
 616                 neg_flags = gensec_ntlmssp_state->neg_flags;
 617
 618                 DEBUG(10, ("Requested negotiated feature flags\n"));
 619                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 620                 return;
 621         }
 622
 623         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 624
 625         /* don't leak 'bad password'/'no such user' info to the network client */
 626         nt_status = auth_nt_status_squash(nt_status);
 627
 628         if (out.length) {
 629                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 630         } else {
 631                 out_base64 = NULL;
 632         }
 633
 634         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 635                 reply_arg = "*";
 636                 if (first) {
 637                         reply_code = "YR";
 638                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 639                         reply_code = "KK";
 640                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 641                         reply_code = "TT";
 642                 } else {
 643                         abort();
 644                 }
 645
 646
 647         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 648                 reply_code = "BH";
 649                 reply_arg = nt_errstr(nt_status);
 650                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 651         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 652                 reply_code = "BH";
 653                 reply_arg = nt_errstr(nt_status);
 654                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 655         } else if (!NT_STATUS_IS_OK(nt_status)) {
 656                 reply_code = "NA";
 657                 reply_arg = nt_errstr(nt_status);
 658                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 659         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 660                 struct auth_session_info *session_info;
 661
 662                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 663                 if (!NT_STATUS_IS_OK(nt_status)) {
 664                         reply_code = "BH";
 665                         reply_arg = nt_errstr(nt_status);
 666                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 667                 } else {
 668
 669                         reply_code = "AF";
 670                         reply_arg = talloc_asprintf(state->gensec_state,
 671                                                     "%s%s%s", session_info->server_info->domain_name,
 672                                                     lp_winbind_separator(lp_ctx), session_info->server_info->account_name);
 673                         talloc_free(session_info);
 674                 }
 675         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 676                 reply_code = "AF";
 677                 reply_arg = out_base64;
 678         } else {
 679                 abort();
 680         }
 681
 682         switch (stdio_helper_mode) {
 683         case GSS_SPNEGO_SERVER:
 684                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 685                           out_base64 ? out_base64 : "*",
 686                           reply_arg ? reply_arg : "*");
 687                 break;
 688         default:
 689                 if (out_base64) {
 690                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 691                 } else if (reply_arg) {
 692                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 693                 } else {
 694                         mux_printf(mux_id, "%s\n", reply_code);
 695                 }
 696         }
 697
 698         talloc_free(mem_ctx);
 699         return;
 700 }
 701
 702 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 703                                          struct loadparm_context *lp_ctx,
 704                                          char *buf, int length, void **private,
 705                                          unsigned int mux_id, void **private2)
 706 {
 707         char *request, *parameter;
 708         static DATA_BLOB challenge;
 709         static DATA_BLOB lm_response;
 710         static DATA_BLOB nt_response;
 711         static char *full_username;
 712         static char *username;
 713         static char *domain;
 714         static char *plaintext_password;
 715         static bool ntlm_server_1_user_session_key;
 716         static bool ntlm_server_1_lm_session_key;
 717
 718         if (strequal(buf, ".")) {
 719                 if (!full_username && !username) {
 720                         mux_printf(mux_id, "Error: No username supplied!\n");
 721                 } else if (plaintext_password) {
 722                         /* handle this request as plaintext */
 723                         if (!full_username) {
 724                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(lp_ctx), username) == -1) {
 725                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 726                                         return;
 727                                 }
 728                         }
 729                         if (check_plaintext_auth(full_username, plaintext_password, false)) {
 730                                 mux_printf(mux_id, "Authenticated: Yes\n");
 731                         } else {
 732                                 mux_printf(mux_id, "Authenticated: No\n");
 733                         }
 734                 } else if (!lm_response.data && !nt_response.data) {
 735                         mux_printf(mux_id, "Error: No password supplied!\n");
 736                 } else if (!challenge.data) {
 737                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 738                 } else {
 739                         char *error_string = NULL;
 740                         DATA_BLOB lm_key;
 741                         DATA_BLOB user_session_key;
 742                         uint32_t flags = 0;
 743
 744                         if (full_username && !username) {
 745                                 fstring fstr_user;
 746                                 fstring fstr_domain;
 747
 748                                 if (!parse_ntlm_auth_domain_user(full_username, fstr_user, fstr_domain,
 749                                                                  *lp_winbind_separator(lp_ctx))) {
 750                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 751                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 752                                 }
 753                                 SAFE_FREE(username);
 754                                 SAFE_FREE(domain);
 755                                 username = smb_xstrdup(fstr_user);
 756                                 domain = smb_xstrdup(fstr_domain);
 757                         }
 758
 759                         if (!domain) {
 760                                 domain = smb_xstrdup(lp_workgroup(lp_ctx));
 761                         }
 762
 763                         if (ntlm_server_1_lm_session_key)
 764                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 765
 766                         if (ntlm_server_1_user_session_key)
 767                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 768
 769                         if (!NT_STATUS_IS_OK(
 770                                     local_pw_check_specified(lp_ctx,
 771                                                              username,
 772                                                               domain,
 773                                                               lp_netbios_name(lp_ctx),
 774                                                               &challenge,
 775                                                               &lm_response,
 776                                                               &nt_response,
 777                                                               flags,
 778                                                               &lm_key,
 779                                                               &user_session_key,
 780                                                               &error_string,
 781                                                               NULL))) {
 782
 783                                 mux_printf(mux_id, "Authenticated: No\n");
 784                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 785                                 SAFE_FREE(error_string);
 786                         } else {
 787                                 static char zeros[16];
 788                                 char *hex_lm_key;
 789                                 char *hex_user_session_key;
 790
 791                                 mux_printf(mux_id, "Authenticated: Yes\n");
 792
 793                                 if (ntlm_server_1_lm_session_key
 794                                     && lm_key.length
 795                                     && (memcmp(zeros, lm_key.data,
 796                                                                 lm_key.length) != 0)) {
 797                                         hex_encode(lm_key.data,
 798                                                    lm_key.length,
 799                                                    &hex_lm_key);
 800                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 801                                         SAFE_FREE(hex_lm_key);
 802                                 }
 803
 804                                 if (ntlm_server_1_user_session_key
 805                                     && user_session_key.length
 806                                     && (memcmp(zeros, user_session_key.data,
 807                                                user_session_key.length) != 0)) {
 808                                         hex_encode(user_session_key.data,
 809                                                    user_session_key.length,
 810                                                    &hex_user_session_key);
 811                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 812                                         SAFE_FREE(hex_user_session_key);
 813                                 }
 814                         }
 815                 }
 816                 /* clear out the state */
 817                 challenge = data_blob(NULL, 0);
 818                 nt_response = data_blob(NULL, 0);
 819                 lm_response = data_blob(NULL, 0);
 820                 SAFE_FREE(full_username);
 821                 SAFE_FREE(username);
 822                 SAFE_FREE(domain);
 823                 SAFE_FREE(plaintext_password);
 824                 ntlm_server_1_user_session_key = false;
 825                 ntlm_server_1_lm_session_key = false;
 826                 mux_printf(mux_id, ".\n");
 827
 828                 return;
 829         }
 830
 831         request = buf;
 832
 833         /* Indicates a base64 encoded structure */
 834         parameter = strstr(request, ":: ");
 835         if (!parameter) {
 836                 parameter = strstr(request, ": ");
 837
 838                 if (!parameter) {
 839                         DEBUG(0, ("Parameter not found!\n"));
 840                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 841                         return;
 842                 }
 843
 844                 parameter[0] ='\0';
 845                 parameter++;
 846                 parameter[0] ='\0';
 847                 parameter++;
 848
 849         } else {
 850                 parameter[0] ='\0';
 851                 parameter++;
 852                 parameter[0] ='\0';
 853                 parameter++;
 854                 parameter[0] ='\0';
 855                 parameter++;
 856
 857                 base64_decode_inplace(parameter);
 858         }
 859
 860         if (strequal(request, "LANMAN-Challenge")) {
 861                 challenge = strhex_to_data_blob(parameter);
 862                 if (challenge.length != 8) {
 863                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 864                                   parameter,
 865                                   (int)challenge.length);
 866                         challenge = data_blob(NULL, 0);
 867                 }
 868         } else if (strequal(request, "NT-Response")) {
 869                 nt_response = strhex_to_data_blob(parameter);
 870                 if (nt_response.length < 24) {
 871                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 872                                   parameter,
 873                                   (int)nt_response.length);
 874                         nt_response = data_blob(NULL, 0);
 875                 }
 876         } else if (strequal(request, "LANMAN-Response")) {
 877                 lm_response = strhex_to_data_blob(parameter);
 878                 if (lm_response.length != 24) {
 879                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 880                                   parameter,
 881                                   (int)lm_response.length);
 882                         lm_response = data_blob(NULL, 0);
 883                 }
 884         } else if (strequal(request, "Password")) {
 885                 plaintext_password = smb_xstrdup(parameter);
 886         } else if (strequal(request, "NT-Domain")) {
 887                 domain = smb_xstrdup(parameter);
 888         } else if (strequal(request, "Username")) {
 889                 username = smb_xstrdup(parameter);
 890         } else if (strequal(request, "Full-Username")) {
 891                 full_username = smb_xstrdup(parameter);
 892         } else if (strequal(request, "Request-User-Session-Key")) {
 893                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 894         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 895                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 896         } else {
 897                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 898         }
 899 }
 900
 901 static void manage_squid_request(struct loadparm_context *lp_ctx, enum stdio_helper_mode helper_mode,
 902                                  stdio_helper_function fn, void **private2)
 903 {
 904         char *buf;
 905         char tmp[INITIAL_BUFFER_SIZE+1];
 906         unsigned int mux_id = 0;
 907         int length, buf_size = 0;
 908         char *c;
 909         struct mux_private {
 910                 unsigned int max_mux;
 911                 void **private_pointers;
 912         };
 913
 914         static struct mux_private *mux_private;
 915         static void *normal_private;
 916         void **private;
 917
 918         buf = talloc_strdup(NULL, "");
 919
 920         if (buf == NULL) {
 921                 DEBUG(0, ("Failed to allocate memory for reading the input "
 922                           "buffer.\n"));
 923                 x_fprintf(x_stdout, "ERR\n");
 924                 return;
 925         }
 926
 927         do {
 928                 /* this is not a typo - x_fgets doesn't work too well under
 929                  * squid */
 930                 if (fgets(tmp, INITIAL_BUFFER_SIZE, stdin) == NULL) {
 931                         if (ferror(stdin)) {
 932                                 DEBUG(1, ("fgets() failed! dying..... errno=%d "
 933                                           "(%s)\n", ferror(stdin),
 934                                           strerror(ferror(stdin))));
 935
 936                                 exit(1);    /* BIIG buffer */
 937                         }
 938                         exit(0);
 939                 }
 940
 941                 buf = talloc_strdup_append_buffer(buf, tmp);
 942                 buf_size += INITIAL_BUFFER_SIZE;
 943
 944                 if (buf_size > MAX_BUFFER_SIZE) {
 945                         DEBUG(0, ("Invalid Request (too large)\n"));
 946                         x_fprintf(x_stdout, "ERR\n");
 947                         talloc_free(buf);
 948                         return;
 949                 }
 950
 951                 c = strchr(buf, '\n');
 952         } while (c == NULL);
 953
 954         *c = '\0';
 955         length = c-buf;
 956
 957         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 958
 959         if (buf[0] == '\0') {
 960                 DEBUG(0, ("Invalid Request (empty)\n"));
 961                 x_fprintf(x_stdout, "ERR\n");
 962                 talloc_free(buf);
 963                 return;
 964         }
 965
 966         if (opt_multiplex) {
 967                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 968                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 969                         x_fprintf(x_stdout, "ERR\n");
 970                         talloc_free(buf);
 971                         return;
 972                 }
 973                 if (!mux_private) {
 974                         mux_private = talloc(NULL, struct mux_private);
 975                         mux_private->max_mux = 0;
 976                         mux_private->private_pointers = NULL;
 977                 }
 978
 979                 c=strchr(buf,' ');
 980                 if (!c) {
 981                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
 982                         x_fprintf(x_stdout, "ERR\n");
 983                         talloc_free(buf);
 984                         return;
 985                 }
 986                 c++;
 987                 if (mux_id >= mux_private->max_mux) {
 988                         unsigned int prev_max = mux_private->max_mux;
 989                         mux_private->max_mux = mux_id + 1;
 990                         mux_private->private_pointers
 991                                 = talloc_realloc(mux_private,
 992                                                    mux_private->private_pointers,
 993                                                    void *, mux_private->max_mux);
 994                         memset(&mux_private->private_pointers[prev_max], '\0',
 995                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
 996                 };
 997
 998                 private = &mux_private->private_pointers[mux_id];
 999         } else {
1000                 c = buf;
1001                 private = &normal_private;
1002         }
1003
1004         fn(helper_mode, lp_ctx, c, length, private, mux_id, private2);
1005         talloc_free(buf);
1006 }
1007
1008 static void squid_stream(struct loadparm_context *lp_ctx,
1009                          enum stdio_helper_mode stdio_mode,
1010                          stdio_helper_function fn) {
1011         /* initialize FDescs */
1012         x_setbuf(x_stdout, NULL);
1013         x_setbuf(x_stderr, NULL);
1014         while(1) {
1015                 manage_squid_request(lp_ctx, stdio_mode, fn, NULL);
1016         }
1017 }
1018
1019
1020 /* Main program */
1021
1022 enum {
1023         OPT_USERNAME = 1000,
1024         OPT_DOMAIN,
1025         OPT_WORKSTATION,
1026         OPT_CHALLENGE,
1027         OPT_RESPONSE,
1028         OPT_LM,
1029         OPT_NT,
1030         OPT_PASSWORD,
1031         OPT_LM_KEY,
1032         OPT_USER_SESSION_KEY,
1033         OPT_DIAGNOSTICS,
1034         OPT_REQUIRE_MEMBERSHIP,
1035         OPT_MULTIPLEX,
1036         OPT_USE_CACHED_CREDS,
1037 };
1038
1039 int main(int argc, const char **argv)
1040 {
1041         static const char *helper_protocol;
1042         int opt;
1043
1044         poptContext pc;
1045
1046         /* NOTE: DO NOT change this interface without considering the implications!
1047            This is an external interface, which other programs will use to interact
1048            with this helper.
1049         */
1050
1051         /* We do not use single-letter command abbreviations, because they harm future
1052            interface stability. */
1053
1054         struct poptOption long_options[] = {
1055                 POPT_AUTOHELP
1056                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1057                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1058                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1059                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1060                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1061                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1062                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1063                 POPT_COMMON_SAMBA
1064                 POPT_COMMON_VERSION
1065                 { NULL }
1066         };
1067
1068         /* Samba client initialisation */
1069
1070         setup_logging(NULL, DEBUG_STDERR);
1071
1072         /* Parse options */
1073
1074         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1075
1076         /* Parse command line options */
1077
1078         if (argc == 1) {
1079                 poptPrintHelp(pc, stderr, 0);
1080                 return 1;
1081         }
1082
1083         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1084                             POPT_CONTEXT_KEEP_FIRST);
1085
1086         while((opt = poptGetNextOpt(pc)) != -1) {
1087                 if (opt < -1) {
1088                         break;
1089                 }
1090         }
1091         if (opt < -1) {
1092                 fprintf(stderr, "%s: %s\n",
1093                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1094                         poptStrerror(opt));
1095                 return 1;
1096         }
1097
1098         gensec_init(cmdline_lp_ctx);
1099
1100         if (opt_domain == NULL) {
1101                 opt_domain = lp_workgroup(cmdline_lp_ctx);
1102         }
1103
1104         if (helper_protocol) {
1105                 int i;
1106                 for (i=0; i<NUM_HELPER_MODES; i++) {
1107                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1108                                 squid_stream(cmdline_lp_ctx, stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1109                                 exit(0);
1110                         }
1111                 }
1112                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1113
1114                 for (i=0; i<NUM_HELPER_MODES; i++) {
1115                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1116                 }
1117
1118                 exit(1);
1119         }
1120
1121         if (!opt_username) {
1122                 x_fprintf(x_stderr, "username must be specified!\n\n");
1123                 poptPrintHelp(pc, stderr, 0);
1124                 exit(1);
1125         }
1126
1127         if (opt_workstation == NULL) {
1128                 opt_workstation = lp_netbios_name(cmdline_lp_ctx);
1129         }
1130
1131         if (!opt_password) {
1132                 opt_password = getpass("password: ");
1133         }
1134
1135         {
1136                 char *user;
1137
1138                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(cmdline_lp_ctx), opt_username);
1139                 if (!check_plaintext_auth(user, opt_password, true)) {
1140                         return 1;
1141                 }
1142         }
1143
1144         /* Exit code */
1145
1146         poptFreeContext(pc);
1147         return 0;
1148 }