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 "libcli/auth/libcli_auth.h"
  34 #include "libcli/security/security.h"
  35 #include "lib/events/events.h"
  36 #include "lib/messaging/messaging.h"
  37 #include "lib/messaging/irpc.h"
  38 #include "auth/ntlmssp/ntlmssp.h"
  39 #include "param/param.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                                       struct loadparm_context *lp_ctx,
  61                                       char *buf, int length, void **private1,
  62                                       unsigned int mux_id, void **private2);
  63
  64 static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode,
  65                                         struct loadparm_context *lp_ctx,
  66                                         char *buf, int length, void **private1,
  67                                         unsigned int mux_id, void **private2);
  68
  69 static void manage_gensec_request (enum stdio_helper_mode stdio_helper_mode,
  70                                    struct loadparm_context *lp_ctx,
  71                                    char *buf, int length, void **private1,
  72                                    unsigned int mux_id, void **private2);
  73
  74 static void manage_ntlm_server_1_request (enum stdio_helper_mode stdio_helper_mode,
  75                                           struct loadparm_context *lp_ctx,
  76                                           char *buf, int length, void **private1,
  77                                           unsigned int mux_id, void **private2);
  78
  79 static void manage_squid_request(struct loadparm_context *lp_ctx,
  80                                  enum stdio_helper_mode helper_mode,
  81                                  stdio_helper_function fn, void **private2);
  82
  83 static const struct {
  84         enum stdio_helper_mode mode;
  85         const char *name;
  86         stdio_helper_function fn;
  87 } stdio_helper_protocols[] = {
  88         { SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
  89         { SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
  90         { SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_gensec_request},
  91         { GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gensec_request},
  92         { GSS_SPNEGO_SERVER, "gss-spnego", manage_gensec_request},
  93         { NTLMSSP_CLIENT_1, "ntlmssp-client-1", manage_gensec_request},
  94         { NTLM_SERVER_1, "ntlm-server-1", manage_ntlm_server_1_request},
  95         { NUM_HELPER_MODES, NULL, NULL}
  96 };
  97
  98 extern int winbindd_fd;
  99
 100 static const char *opt_username;
 101 static const char *opt_domain;
 102 static const char *opt_workstation;
 103 static const char *opt_password;
 104 static int opt_multiplex;
 105 static int use_cached_creds;
 106
 107
 108 static void mux_printf(unsigned int mux_id, const char *format, ...) PRINTF_ATTRIBUTE(2, 3);
 109
 110 static void mux_printf(unsigned int mux_id, const char *format, ...)
 111 {
 112         va_list ap;
 113
 114         if (opt_multiplex) {
 115                 x_fprintf(x_stdout, "%d ", mux_id);
 116         }
 117
 118         va_start(ap, format);
 119         x_vfprintf(x_stdout, format, ap);
 120         va_end(ap);
 121 }
 122
 123
 124
 125 /* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
 126    form DOMAIN/user into a domain and a user */
 127
 128 static bool parse_ntlm_auth_domain_user(const char *domuser, char **domain,
 129                                                                                 char **user, char winbind_separator)
 130 {
 131
 132         char *p = strchr(domuser, winbind_separator);
 133
 134         if (!p) {
 135                 return false;
 136         }
 137
 138         *user = smb_xstrdup(p+1);
 139         *domain = smb_xstrdup(domuser);
 140         (*domain)[PTR_DIFF(p, domuser)] = 0;
 141
 142         return true;
 143 }
 144
 145 /**
 146  * Decode a base64 string into a DATA_BLOB - simple and slow algorithm
 147  **/
 148 static DATA_BLOB base64_decode_data_blob(TALLOC_CTX *mem_ctx, const char *s)
 149 {
 150         DATA_BLOB ret = data_blob_talloc(mem_ctx, s, strlen(s)+1);
 151         ret.length = ldb_base64_decode((char *)ret.data);
 152         return ret;
 153 }
 154
 155 /**
 156  * Encode a base64 string into a talloc()ed string caller to free.
 157  **/
 158 static char *base64_encode_data_blob(TALLOC_CTX *mem_ctx, DATA_BLOB data)
 159 {
 160         return ldb_base64_encode(mem_ctx, (const char *)data.data, data.length);
 161 }
 162
 163 /**
 164  * Decode a base64 string in-place - wrapper for the above
 165  **/
 166 static void base64_decode_inplace(char *s)
 167 {
 168         ldb_base64_decode(s);
 169 }
 170
 171
 172
 173 /* Authenticate a user with a plaintext password */
 174
 175 static bool check_plaintext_auth(const char *user, const char *pass,
 176                                  bool stdout_diagnostics)
 177 {
 178         return (strcmp(pass, opt_password) == 0);
 179 }
 180
 181 /* authenticate a user with an encrypted username/password */
 182
 183 static NTSTATUS local_pw_check_specified(struct loadparm_context *lp_ctx,
 184                                          const char *username,
 185                                          const char *domain,
 186                                          const char *workstation,
 187                                          const DATA_BLOB *challenge,
 188                                          const DATA_BLOB *lm_response,
 189                                          const DATA_BLOB *nt_response,
 190                                          uint32_t flags,
 191                                          DATA_BLOB *lm_session_key,
 192                                          DATA_BLOB *user_session_key,
 193                                          char **error_string,
 194                                          char **unix_name)
 195 {
 196         NTSTATUS nt_status;
 197         struct samr_Password lm_pw, nt_pw;
 198         struct samr_Password *lm_pwd, *nt_pwd;
 199         TALLOC_CTX *mem_ctx = talloc_init("local_pw_check_specified");
 200         if (!mem_ctx) {
 201                 nt_status = NT_STATUS_NO_MEMORY;
 202         } else {
 203
 204                 E_md4hash(opt_password, nt_pw.hash);
 205                 if (E_deshash(opt_password, lm_pw.hash)) {
 206                         lm_pwd = &lm_pw;
 207                 } else {
 208                         lm_pwd = NULL;
 209                 }
 210                 nt_pwd = &nt_pw;
 211
 212
 213                 nt_status = ntlm_password_check(mem_ctx,
 214                                                 lp_lanman_auth(lp_ctx),
 215                                                 lp_ntlm_auth(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 **private1,
 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 **private1,
 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 Query invalid\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(*private1 /* 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 Out of memory\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 Expected a password\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)(uintptr_t)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         char *tok;
 343         size_t tok_len = 1024;
 344         const char *p=list;
 345
 346         if (!list)
 347                 return false;
 348
 349         tok = (char *)malloc(tok_len);
 350         if (!tok) {
 351                 return false;
 352         }
 353
 354         while (next_token(&p, tok, LIST_SEP, tok_len)) {
 355                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0) {
 356                         free(tok);
 357                         return true;
 358                 }
 359         }
 360         free(tok);
 361         return false;
 362 }
 363
 364 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 365 {
 366         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, true)) {
 367                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 368                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 369         }
 370         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, true)) {
 371                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 372                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 373         }
 374         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, true)) {
 375                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 376                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 377         }
 378 }
 379
 380 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 381                                   struct loadparm_context *lp_ctx,
 382                                   char *buf, int length, void **private1,
 383                                   unsigned int mux_id, void **private2)
 384 {
 385         DATA_BLOB in;
 386         DATA_BLOB out = data_blob(NULL, 0);
 387         char *out_base64 = NULL;
 388         const char *reply_arg = NULL;
 389         struct gensec_ntlm_state {
 390                 struct gensec_security *gensec_state;
 391                 const char *set_password;
 392         };
 393         struct gensec_ntlm_state *state;
 394         struct tevent_context *ev;
 395         struct messaging_context *msg;
 396
 397         NTSTATUS nt_status;
 398         bool first = false;
 399         const char *reply_code;
 400         struct cli_credentials *creds;
 401
 402         static char *want_feature_list = NULL;
 403         static DATA_BLOB session_key;
 404
 405         TALLOC_CTX *mem_ctx;
 406
 407         if (*private1) {
 408                 state = (struct gensec_ntlm_state *)*private1;
 409         } else {
 410                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 411                 if (!state) {
 412                         mux_printf(mux_id, "BH No Memory\n");
 413                         exit(1);
 414                 }
 415                 *private1 = state;
 416                 if (opt_password) {
 417                         state->set_password = opt_password;
 418                 }
 419         }
 420
 421         if (strlen(buf) < 2) {
 422                 DEBUG(1, ("query [%s] invalid", buf));
 423                 mux_printf(mux_id, "BH Query invalid\n");
 424                 return;
 425         }
 426
 427         if (strlen(buf) > 3) {
 428                 if(strncmp(buf, "SF ", 3) == 0) {
 429                         DEBUG(10, ("Setting flags to negotiate\n"));
 430                         talloc_free(want_feature_list);
 431                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 432                         mux_printf(mux_id, "OK\n");
 433                         return;
 434                 }
 435                 in = base64_decode_data_blob(NULL, buf + 3);
 436         } else {
 437                 in = data_blob(NULL, 0);
 438         }
 439
 440         if (strncmp(buf, "YR", 2) == 0) {
 441                 if (state->gensec_state) {
 442                         talloc_free(state->gensec_state);
 443                         state->gensec_state = NULL;
 444                 }
 445         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 446                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 447                 mux_printf(mux_id, "BH Command expected\n");
 448                 data_blob_free(&in);
 449                 return;
 450         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 451                     (strncmp(buf, "KK ", 3) != 0) &&
 452                     (strncmp(buf, "AF ", 3) != 0) &&
 453                     (strncmp(buf, "NA ", 3) != 0) &&
 454                     (strncmp(buf, "UG", 2) != 0) &&
 455                     (strncmp(buf, "PW ", 3) != 0) &&
 456                     (strncmp(buf, "GK", 2) != 0) &&
 457                     (strncmp(buf, "GF", 2) != 0)) {
 458                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 459                 mux_printf(mux_id, "BH SPNEGO request invalid\n");
 460                 data_blob_free(&in);
 461                 return;
 462         }
 463
 464         ev = s4_event_context_init(state);
 465         if (!ev) {
 466                 exit(1);
 467         }
 468         /* setup gensec */
 469         if (!(state->gensec_state)) {
 470                 switch (stdio_helper_mode) {
 471                 case GSS_SPNEGO_CLIENT:
 472                 case NTLMSSP_CLIENT_1:
 473                         /* setup the client side */
 474
 475                         nt_status = gensec_client_start(NULL, &state->gensec_state, ev,
 476                                                         lp_gensec_settings(NULL, lp_ctx));
 477                         if (!NT_STATUS_IS_OK(nt_status)) {
 478                                 exit(1);
 479                         }
 480
 481                         break;
 482                 case GSS_SPNEGO_SERVER:
 483                 case SQUID_2_5_NTLMSSP:
 484                 {
 485                         const char *winbind_method[] = { "winbind", NULL };
 486                         struct auth_context *auth_context;
 487
 488                         msg = messaging_client_init(state, lp_messaging_path(state, lp_ctx),
 489                                                     lp_iconv_convenience(lp_ctx), ev);
 490                         if (!msg) {
 491                                 exit(1);
 492                         }
 493                         nt_status = auth_context_create_methods(mem_ctx,
 494                                                                 winbind_method,
 495                                                                 ev,
 496                                                                 msg,
 497                                                                 lp_ctx,
 498                                                                 &auth_context);
 499
 500                         if (!NT_STATUS_IS_OK(nt_status)) {
 501                                 exit(1);
 502                         }
 503
 504                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev,
 505                                                                  lp_gensec_settings(state, lp_ctx),
 506                                                                  auth_context, &state->gensec_state))) {
 507                                 exit(1);
 508                         }
 509                         break;
 510                 }
 511                 default:
 512                         abort();
 513                 }
 514
 515                 creds = cli_credentials_init(state->gensec_state);
 516                 cli_credentials_set_conf(creds, lp_ctx);
 517                 if (opt_username) {
 518                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 519                 }
 520                 if (opt_domain) {
 521                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 522                 }
 523                 if (state->set_password) {
 524                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 525                 } else {
 526                         cli_credentials_set_password_callback(creds, get_password);
 527                         creds->priv_data = (void*)(uintptr_t)mux_id;
 528                 }
 529                 if (opt_workstation) {
 530                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 531                 }
 532
 533                 switch (stdio_helper_mode) {
 534                 case GSS_SPNEGO_SERVER:
 535                 case SQUID_2_5_NTLMSSP:
 536                         cli_credentials_set_machine_account(creds, lp_ctx);
 537                         break;
 538                 default:
 539                         break;
 540                 }
 541
 542                 gensec_set_credentials(state->gensec_state, creds);
 543                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 544
 545                 switch (stdio_helper_mode) {
 546                 case GSS_SPNEGO_CLIENT:
 547                 case GSS_SPNEGO_SERVER:
 548                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 549                         if (!in.length) {
 550                                 first = true;
 551                         }
 552                         break;
 553                 case NTLMSSP_CLIENT_1:
 554                         if (!in.length) {
 555                                 first = true;
 556                         }
 557                         /* fall through */
 558                 case SQUID_2_5_NTLMSSP:
 559                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 560                         break;
 561                 default:
 562                         abort();
 563                 }
 564
 565                 if (!NT_STATUS_IS_OK(nt_status)) {
 566                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 567                         mux_printf(mux_id, "BH GENSEC mech failed to start\n");
 568                         return;
 569                 }
 570
 571         }
 572
 573         /* update */
 574         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 575
 576         if (strncmp(buf, "PW ", 3) == 0) {
 577                 state->set_password = talloc_strndup(state,
 578                                                      (const char *)in.data,
 579                                                      in.length);
 580
 581                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 582                                              state->set_password,
 583                                              CRED_SPECIFIED);
 584                 mux_printf(mux_id, "OK\n");
 585                 data_blob_free(&in);
 586                 talloc_free(mem_ctx);
 587                 return;
 588         }
 589
 590         if (strncmp(buf, "UG", 2) == 0) {
 591                 int i;
 592                 char *grouplist = NULL;
 593                 struct auth_session_info *session_info;
 594
 595                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 596                 if (!NT_STATUS_IS_OK(nt_status)) {
 597                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 598                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 599                         data_blob_free(&in);
 600                         talloc_free(mem_ctx);
 601                         return;
 602                 }
 603
 604                 /* get the string onto the context */
 605                 grouplist = talloc_strdup(mem_ctx, "");
 606
 607                 for (i=0; i<session_info->security_token->num_sids; i++) {
 608                         struct security_token *token = session_info->security_token;
 609                         const char *sidstr = dom_sid_string(session_info,
 610                                                             token->sids[i]);
 611                         grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
 612                 }
 613
 614                 mux_printf(mux_id, "GL %s\n", grouplist);
 615                 talloc_free(session_info);
 616                 data_blob_free(&in);
 617                 talloc_free(mem_ctx);
 618                 return;
 619         }
 620
 621         if (strncmp(buf, "GK", 2) == 0) {
 622                 char *base64_key;
 623                 DEBUG(10, ("Requested session key\n"));
 624                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 625                 if(!NT_STATUS_IS_OK(nt_status)) {
 626                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 627                         mux_printf(mux_id, "BH No session key\n");
 628                         talloc_free(mem_ctx);
 629                         return;
 630                 } else {
 631                         base64_key = base64_encode_data_blob(state, session_key);
 632                         mux_printf(mux_id, "GK %s\n", base64_key);
 633                         talloc_free(base64_key);
 634                 }
 635                 talloc_free(mem_ctx);
 636                 return;
 637         }
 638
 639         if (strncmp(buf, "GF", 2) == 0) {
 640                 struct gensec_ntlmssp_state *gensec_ntlmssp_state;
 641                 uint32_t neg_flags;
 642
 643                 gensec_ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 644                                 struct gensec_ntlmssp_state);
 645                 neg_flags = gensec_ntlmssp_state->neg_flags;
 646
 647                 DEBUG(10, ("Requested negotiated feature flags\n"));
 648                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 649                 return;
 650         }
 651
 652         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 653
 654         /* don't leak 'bad password'/'no such user' info to the network client */
 655         nt_status = auth_nt_status_squash(nt_status);
 656
 657         if (out.length) {
 658                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 659         } else {
 660                 out_base64 = NULL;
 661         }
 662
 663         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 664                 reply_arg = "*";
 665                 if (first) {
 666                         reply_code = "YR";
 667                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 668                         reply_code = "KK";
 669                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 670                         reply_code = "TT";
 671                 } else {
 672                         abort();
 673                 }
 674
 675
 676         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 677                 reply_code = "BH NT_STATUS_ACCESS_DENIED";
 678                 reply_arg = nt_errstr(nt_status);
 679                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 680         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 681                 reply_code = "BH NT_STATUS_UNSUCCESSFUL";
 682                 reply_arg = nt_errstr(nt_status);
 683                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 684         } else if (!NT_STATUS_IS_OK(nt_status)) {
 685                 reply_code = "NA";
 686                 reply_arg = nt_errstr(nt_status);
 687                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 688         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 689                 struct auth_session_info *session_info;
 690
 691                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 692                 if (!NT_STATUS_IS_OK(nt_status)) {
 693                         reply_code = "BH Failed to retrive session info";
 694                         reply_arg = nt_errstr(nt_status);
 695                         DEBUG(1, ("GENSEC failed to retreive the session info: %s\n", nt_errstr(nt_status)));
 696                 } else {
 697
 698                         reply_code = "AF";
 699                         reply_arg = talloc_asprintf(state->gensec_state,
 700                                                     "%s%s%s", session_info->server_info->domain_name,
 701                                                     lp_winbind_separator(lp_ctx), session_info->server_info->account_name);
 702                         talloc_free(session_info);
 703                 }
 704         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 705                 reply_code = "AF";
 706                 reply_arg = out_base64;
 707         } else {
 708                 abort();
 709         }
 710
 711         switch (stdio_helper_mode) {
 712         case GSS_SPNEGO_SERVER:
 713                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 714                           out_base64 ? out_base64 : "*",
 715                           reply_arg ? reply_arg : "*");
 716                 break;
 717         default:
 718                 if (out_base64) {
 719                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 720                 } else if (reply_arg) {
 721                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 722                 } else {
 723                         mux_printf(mux_id, "%s\n", reply_code);
 724                 }
 725         }
 726
 727         talloc_free(mem_ctx);
 728         return;
 729 }
 730
 731 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 732                                          struct loadparm_context *lp_ctx,
 733                                          char *buf, int length, void **private1,
 734                                          unsigned int mux_id, void **private2)
 735 {
 736         char *request, *parameter;
 737         static DATA_BLOB challenge;
 738         static DATA_BLOB lm_response;
 739         static DATA_BLOB nt_response;
 740         static char *full_username;
 741         static char *username;
 742         static char *domain;
 743         static char *plaintext_password;
 744         static bool ntlm_server_1_user_session_key;
 745         static bool ntlm_server_1_lm_session_key;
 746
 747         if (strequal(buf, ".")) {
 748                 if (!full_username && !username) {
 749                         mux_printf(mux_id, "Error: No username supplied!\n");
 750                 } else if (plaintext_password) {
 751                         /* handle this request as plaintext */
 752                         if (!full_username) {
 753                                 if (asprintf(&full_username, "%s%c%s", domain, *lp_winbind_separator(lp_ctx), username) == -1) {
 754                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 755                                         return;
 756                                 }
 757                         }
 758                         if (check_plaintext_auth(full_username, plaintext_password, false)) {
 759                                 mux_printf(mux_id, "Authenticated: Yes\n");
 760                         } else {
 761                                 mux_printf(mux_id, "Authenticated: No\n");
 762                         }
 763                 } else if (!lm_response.data && !nt_response.data) {
 764                         mux_printf(mux_id, "Error: No password supplied!\n");
 765                 } else if (!challenge.data) {
 766                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 767                 } else {
 768                         char *error_string = NULL;
 769                         DATA_BLOB lm_key;
 770                         DATA_BLOB user_session_key;
 771                         uint32_t flags = 0;
 772
 773                         if (full_username && !username) {
 774                                 SAFE_FREE(username);
 775                                 SAFE_FREE(domain);
 776                                 if (!parse_ntlm_auth_domain_user(full_username, &username,
 777                                                                                                  &domain,
 778                                                                                                  *lp_winbind_separator(lp_ctx))) {
 779                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 780                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 781                                 }
 782                         }
 783
 784                         if (!domain) {
 785                                 domain = smb_xstrdup(lp_workgroup(lp_ctx));
 786                         }
 787
 788                         if (ntlm_server_1_lm_session_key)
 789                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 790
 791                         if (ntlm_server_1_user_session_key)
 792                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 793
 794                         if (!NT_STATUS_IS_OK(
 795                                     local_pw_check_specified(lp_ctx,
 796                                                              username,
 797                                                               domain,
 798                                                               lp_netbios_name(lp_ctx),
 799                                                               &challenge,
 800                                                               &lm_response,
 801                                                               &nt_response,
 802                                                               flags,
 803                                                               &lm_key,
 804                                                               &user_session_key,
 805                                                               &error_string,
 806                                                               NULL))) {
 807
 808                                 mux_printf(mux_id, "Authenticated: No\n");
 809                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 810                                 SAFE_FREE(error_string);
 811                         } else {
 812                                 static char zeros[16];
 813                                 char *hex_lm_key;
 814                                 char *hex_user_session_key;
 815
 816                                 mux_printf(mux_id, "Authenticated: Yes\n");
 817
 818                                 if (ntlm_server_1_lm_session_key
 819                                     && lm_key.length
 820                                     && (memcmp(zeros, lm_key.data,
 821                                                                 lm_key.length) != 0)) {
 822                                         hex_encode(lm_key.data,
 823                                                    lm_key.length,
 824                                                    &hex_lm_key);
 825                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 826                                         SAFE_FREE(hex_lm_key);
 827                                 }
 828
 829                                 if (ntlm_server_1_user_session_key
 830                                     && user_session_key.length
 831                                     && (memcmp(zeros, user_session_key.data,
 832                                                user_session_key.length) != 0)) {
 833                                         hex_encode(user_session_key.data,
 834                                                    user_session_key.length,
 835                                                    &hex_user_session_key);
 836                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 837                                         SAFE_FREE(hex_user_session_key);
 838                                 }
 839                         }
 840                 }
 841                 /* clear out the state */
 842                 challenge = data_blob(NULL, 0);
 843                 nt_response = data_blob(NULL, 0);
 844                 lm_response = data_blob(NULL, 0);
 845                 SAFE_FREE(full_username);
 846                 SAFE_FREE(username);
 847                 SAFE_FREE(domain);
 848                 SAFE_FREE(plaintext_password);
 849                 ntlm_server_1_user_session_key = false;
 850                 ntlm_server_1_lm_session_key = false;
 851                 mux_printf(mux_id, ".\n");
 852
 853                 return;
 854         }
 855
 856         request = buf;
 857
 858         /* Indicates a base64 encoded structure */
 859         parameter = strstr(request, ":: ");
 860         if (!parameter) {
 861                 parameter = strstr(request, ": ");
 862
 863                 if (!parameter) {
 864                         DEBUG(0, ("Parameter not found!\n"));
 865                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 866                         return;
 867                 }
 868
 869                 parameter[0] ='\0';
 870                 parameter++;
 871                 parameter[0] ='\0';
 872                 parameter++;
 873
 874         } else {
 875                 parameter[0] ='\0';
 876                 parameter++;
 877                 parameter[0] ='\0';
 878                 parameter++;
 879                 parameter[0] ='\0';
 880                 parameter++;
 881
 882                 base64_decode_inplace(parameter);
 883         }
 884
 885         if (strequal(request, "LANMAN-Challenge")) {
 886                 challenge = strhex_to_data_blob(NULL, parameter);
 887                 if (challenge.length != 8) {
 888                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 889                                   parameter,
 890                                   (int)challenge.length);
 891                         challenge = data_blob(NULL, 0);
 892                 }
 893         } else if (strequal(request, "NT-Response")) {
 894                 nt_response = strhex_to_data_blob(NULL, parameter);
 895                 if (nt_response.length < 24) {
 896                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 897                                   parameter,
 898                                   (int)nt_response.length);
 899                         nt_response = data_blob(NULL, 0);
 900                 }
 901         } else if (strequal(request, "LANMAN-Response")) {
 902                 lm_response = strhex_to_data_blob(NULL, parameter);
 903                 if (lm_response.length != 24) {
 904                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 905                                   parameter,
 906                                   (int)lm_response.length);
 907                         lm_response = data_blob(NULL, 0);
 908                 }
 909         } else if (strequal(request, "Password")) {
 910                 plaintext_password = smb_xstrdup(parameter);
 911         } else if (strequal(request, "NT-Domain")) {
 912                 domain = smb_xstrdup(parameter);
 913         } else if (strequal(request, "Username")) {
 914                 username = smb_xstrdup(parameter);
 915         } else if (strequal(request, "Full-Username")) {
 916                 full_username = smb_xstrdup(parameter);
 917         } else if (strequal(request, "Request-User-Session-Key")) {
 918                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 919         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 920                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 921         } else {
 922                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 923         }
 924 }
 925
 926 static void manage_squid_request(struct loadparm_context *lp_ctx, enum stdio_helper_mode helper_mode,
 927                                  stdio_helper_function fn, void **private2)
 928 {
 929         char *buf;
 930         char tmp[INITIAL_BUFFER_SIZE+1];
 931         unsigned int mux_id = 0;
 932         int length, buf_size = 0;
 933         char *c;
 934         struct mux_private {
 935                 unsigned int max_mux;
 936                 void **private_pointers;
 937         };
 938
 939         static struct mux_private *mux_private;
 940         static void *normal_private;
 941         void **private1;
 942
 943         buf = talloc_strdup(NULL, "");
 944
 945         if (buf == NULL) {
 946                 DEBUG(0, ("Failed to allocate memory for reading the input "
 947                           "buffer.\n"));
 948                 x_fprintf(x_stdout, "ERR\n");
 949                 return;
 950         }
 951
 952         do {
 953                 /* this is not a typo - x_fgets doesn't work too well under
 954                  * squid */
 955                 if (fgets(tmp, INITIAL_BUFFER_SIZE, stdin) == NULL) {
 956                         if (ferror(stdin)) {
 957                                 DEBUG(1, ("fgets() failed! dying..... errno=%d "
 958                                           "(%s)\n", ferror(stdin),
 959                                           strerror(ferror(stdin))));
 960
 961                                 exit(1);    /* BIIG buffer */
 962                         }
 963                         exit(0);
 964                 }
 965
 966                 buf = talloc_strdup_append_buffer(buf, tmp);
 967                 buf_size += INITIAL_BUFFER_SIZE;
 968
 969                 if (buf_size > MAX_BUFFER_SIZE) {
 970                         DEBUG(0, ("Invalid Request (too large)\n"));
 971                         x_fprintf(x_stdout, "ERR\n");
 972                         talloc_free(buf);
 973                         return;
 974                 }
 975
 976                 c = strchr(buf, '\n');
 977         } while (c == NULL);
 978
 979         *c = '\0';
 980         length = c-buf;
 981
 982         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 983
 984         if (buf[0] == '\0') {
 985                 DEBUG(0, ("Invalid Request (empty)\n"));
 986                 x_fprintf(x_stdout, "ERR\n");
 987                 talloc_free(buf);
 988                 return;
 989         }
 990
 991         if (opt_multiplex) {
 992                 if (sscanf(buf, "%u ", &mux_id) != 1) {
 993                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
 994                         x_fprintf(x_stdout, "ERR\n");
 995                         talloc_free(buf);
 996                         return;
 997                 }
 998                 if (!mux_private) {
 999                         mux_private = talloc(NULL, struct mux_private);
1000                         mux_private->max_mux = 0;
1001                         mux_private->private_pointers = NULL;
1002                 }
1003
1004                 c=strchr(buf,' ');
1005                 if (!c) {
1006                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
1007                         x_fprintf(x_stdout, "ERR\n");
1008                         talloc_free(buf);
1009                         return;
1010                 }
1011                 c++;
1012                 if (mux_id >= mux_private->max_mux) {
1013                         unsigned int prev_max = mux_private->max_mux;
1014                         mux_private->max_mux = mux_id + 1;
1015                         mux_private->private_pointers
1016                                 = talloc_realloc(mux_private,
1017                                                    mux_private->private_pointers,
1018                                                    void *, mux_private->max_mux);
1019                         memset(&mux_private->private_pointers[prev_max], '\0',
1020                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
1021                 };
1022
1023                 private1 = &mux_private->private_pointers[mux_id];
1024         } else {
1025                 c = buf;
1026                 private1 = &normal_private;
1027         }
1028
1029         fn(helper_mode, lp_ctx, c, length, private1, mux_id, private2);
1030         talloc_free(buf);
1031 }
1032
1033 static void squid_stream(struct loadparm_context *lp_ctx,
1034                          enum stdio_helper_mode stdio_mode,
1035                          stdio_helper_function fn) {
1036         /* initialize FDescs */
1037         x_setbuf(x_stdout, NULL);
1038         x_setbuf(x_stderr, NULL);
1039         while(1) {
1040                 manage_squid_request(lp_ctx, stdio_mode, fn, NULL);
1041         }
1042 }
1043
1044
1045 /* Main program */
1046
1047 enum {
1048         OPT_USERNAME = 1000,
1049         OPT_DOMAIN,
1050         OPT_WORKSTATION,
1051         OPT_CHALLENGE,
1052         OPT_RESPONSE,
1053         OPT_LM,
1054         OPT_NT,
1055         OPT_PASSWORD,
1056         OPT_LM_KEY,
1057         OPT_USER_SESSION_KEY,
1058         OPT_DIAGNOSTICS,
1059         OPT_REQUIRE_MEMBERSHIP,
1060         OPT_MULTIPLEX,
1061         OPT_USE_CACHED_CREDS,
1062 };
1063
1064 int main(int argc, const char **argv)
1065 {
1066         static const char *helper_protocol;
1067         int opt;
1068
1069         poptContext pc;
1070
1071         /* NOTE: DO NOT change this interface without considering the implications!
1072            This is an external interface, which other programs will use to interact
1073            with this helper.
1074         */
1075
1076         /* We do not use single-letter command abbreviations, because they harm future
1077            interface stability. */
1078
1079         struct poptOption long_options[] = {
1080                 POPT_AUTOHELP
1081                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1082                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1083                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1084                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1085                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1086                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1087                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1088                 POPT_COMMON_SAMBA
1089                 POPT_COMMON_VERSION
1090                 { NULL }
1091         };
1092
1093         /* Samba client initialisation */
1094
1095         setup_logging(NULL, DEBUG_STDERR);
1096
1097         /* Parse options */
1098
1099         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1100
1101         /* Parse command line options */
1102
1103         if (argc == 1) {
1104                 poptPrintHelp(pc, stderr, 0);
1105                 return 1;
1106         }
1107
1108         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1109                             POPT_CONTEXT_KEEP_FIRST);
1110
1111         while((opt = poptGetNextOpt(pc)) != -1) {
1112                 if (opt < -1) {
1113                         break;
1114                 }
1115         }
1116         if (opt < -1) {
1117                 fprintf(stderr, "%s: %s\n",
1118                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1119                         poptStrerror(opt));
1120                 return 1;
1121         }
1122
1123         gensec_init(cmdline_lp_ctx);
1124
1125         if (opt_domain == NULL) {
1126                 opt_domain = lp_workgroup(cmdline_lp_ctx);
1127         }
1128
1129         if (helper_protocol) {
1130                 int i;
1131                 for (i=0; i<NUM_HELPER_MODES; i++) {
1132                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1133                                 squid_stream(cmdline_lp_ctx, stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1134                                 exit(0);
1135                         }
1136                 }
1137                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1138
1139                 for (i=0; i<NUM_HELPER_MODES; i++) {
1140                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1141                 }
1142
1143                 exit(1);
1144         }
1145
1146         if (!opt_username) {
1147                 x_fprintf(x_stderr, "username must be specified!\n\n");
1148                 poptPrintHelp(pc, stderr, 0);
1149                 exit(1);
1150         }
1151
1152         if (opt_workstation == NULL) {
1153                 opt_workstation = lp_netbios_name(cmdline_lp_ctx);
1154         }
1155
1156         if (!opt_password) {
1157                 opt_password = getpass("password: ");
1158         }
1159
1160         {
1161                 char *user;
1162
1163                 asprintf(&user, "%s%c%s", opt_domain, *lp_winbind_separator(cmdline_lp_ctx), opt_username);
1164                 if (!check_plaintext_auth(user, opt_password, true)) {
1165                         return 1;
1166                 }
1167         }
1168
1169         /* Exit code */
1170
1171         poptFreeContext(pc);
1172         return 0;
1173 }