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 <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                                                 lpcfg_lanman_auth(lp_ctx),
 215                                                 lpcfg_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                                 if (asprintf(unix_name, "%s%c%s", domain,
 229                                              *lpcfg_winbind_separator(lp_ctx),
 230                                              username) < 0) {
 231                                         nt_status = NT_STATUS_NO_MEMORY;
 232                                 }
 233                         }
 234                 } else {
 235                         DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
 236                                   domain, username, workstation,
 237                                   nt_errstr(nt_status)));
 238                 }
 239                 talloc_free(mem_ctx);
 240         }
 241         if (error_string) {
 242                 *error_string = strdup(nt_errstr(nt_status));
 243         }
 244         return nt_status;
 245
 246
 247 }
 248
 249 static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
 250                                        struct loadparm_context *lp_ctx,
 251                                        char *buf, int length, void **private1,
 252                                        unsigned int mux_id, void **private2)
 253 {
 254         char *user, *pass;
 255         user=buf;
 256
 257         pass = memchr(buf, ' ', length);
 258         if (!pass) {
 259                 DEBUG(2, ("Password not found. Denying access\n"));
 260                 mux_printf(mux_id, "ERR\n");
 261                 return;
 262         }
 263         *pass='\0';
 264         pass++;
 265
 266         if (stdio_helper_mode == SQUID_2_5_BASIC) {
 267                 rfc1738_unescape(user);
 268                 rfc1738_unescape(pass);
 269         }
 270
 271         if (check_plaintext_auth(user, pass, false)) {
 272                 mux_printf(mux_id, "OK\n");
 273         } else {
 274                 mux_printf(mux_id, "ERR\n");
 275         }
 276 }
 277
 278 /* This is a bit hairy, but the basic idea is to do a password callback
 279    to the calling application.  The callback comes from within gensec */
 280
 281 static void manage_gensec_get_pw_request(enum stdio_helper_mode stdio_helper_mode,
 282                                          struct loadparm_context *lp_ctx,
 283                                          char *buf, int length, void **private1,
 284                                          unsigned int mux_id, void **password)
 285 {
 286         DATA_BLOB in;
 287         if (strlen(buf) < 2) {
 288                 DEBUG(1, ("query [%s] invalid", buf));
 289                 mux_printf(mux_id, "BH Query invalid\n");
 290                 return;
 291         }
 292
 293         if (strlen(buf) > 3) {
 294                 in = base64_decode_data_blob(NULL, buf + 3);
 295         } else {
 296                 in = data_blob(NULL, 0);
 297         }
 298
 299         if (strncmp(buf, "PW ", 3) == 0) {
 300
 301                 *password = talloc_strndup(*private1 /* hopefully the right gensec context, useful to use for talloc */,
 302                                            (const char *)in.data, in.length);
 303
 304                 if (*password == NULL) {
 305                         DEBUG(1, ("Out of memory\n"));
 306                         mux_printf(mux_id, "BH Out of memory\n");
 307                         data_blob_free(&in);
 308                         return;
 309                 }
 310
 311                 mux_printf(mux_id, "OK\n");
 312                 data_blob_free(&in);
 313                 return;
 314         }
 315         DEBUG(1, ("Asked for (and expected) a password\n"));
 316         mux_printf(mux_id, "BH Expected a password\n");
 317         data_blob_free(&in);
 318 }
 319
 320 /**
 321  * Callback for password credentials.  This is not async, and when
 322  * GENSEC and the credentials code is made async, it will look rather
 323  * different.
 324  */
 325
 326 static const char *get_password(struct cli_credentials *credentials)
 327 {
 328         char *password = NULL;
 329
 330         /* Ask for a password */
 331         mux_printf((unsigned int)(uintptr_t)credentials->priv_data, "PW\n");
 332         credentials->priv_data = NULL;
 333
 334         manage_squid_request(cmdline_lp_ctx, NUM_HELPER_MODES /* bogus */, manage_gensec_get_pw_request, (void **)&password);
 335         return password;
 336 }
 337
 338 /**
 339  Check if a string is part of a list.
 340 **/
 341 static bool in_list(const char *s, const char *list, bool casesensitive)
 342 {
 343         char *tok;
 344         size_t tok_len = 1024;
 345         const char *p=list;
 346
 347         if (!list)
 348                 return false;
 349
 350         tok = (char *)malloc(tok_len);
 351         if (!tok) {
 352                 return false;
 353         }
 354
 355         while (next_token(&p, tok, LIST_SEP, tok_len)) {
 356                 if ((casesensitive?strcmp:strcasecmp_m)(tok,s) == 0) {
 357                         free(tok);
 358                         return true;
 359                 }
 360         }
 361         free(tok);
 362         return false;
 363 }
 364
 365 static void gensec_want_feature_list(struct gensec_security *state, char* feature_list)
 366 {
 367         if (in_list("NTLMSSP_FEATURE_SESSION_KEY", feature_list, true)) {
 368                 DEBUG(10, ("want GENSEC_FEATURE_SESSION_KEY\n"));
 369                 gensec_want_feature(state, GENSEC_FEATURE_SESSION_KEY);
 370         }
 371         if (in_list("NTLMSSP_FEATURE_SIGN", feature_list, true)) {
 372                 DEBUG(10, ("want GENSEC_FEATURE_SIGN\n"));
 373                 gensec_want_feature(state, GENSEC_FEATURE_SIGN);
 374         }
 375         if (in_list("NTLMSSP_FEATURE_SEAL", feature_list, true)) {
 376                 DEBUG(10, ("want GENSEC_FEATURE_SEAL\n"));
 377                 gensec_want_feature(state, GENSEC_FEATURE_SEAL);
 378         }
 379 }
 380
 381 static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
 382                                   struct loadparm_context *lp_ctx,
 383                                   char *buf, int length, void **private1,
 384                                   unsigned int mux_id, void **private2)
 385 {
 386         DATA_BLOB in;
 387         DATA_BLOB out = data_blob(NULL, 0);
 388         char *out_base64 = NULL;
 389         const char *reply_arg = NULL;
 390         struct gensec_ntlm_state {
 391                 struct gensec_security *gensec_state;
 392                 const char *set_password;
 393         };
 394         struct gensec_ntlm_state *state;
 395         struct tevent_context *ev;
 396         struct messaging_context *msg;
 397
 398         NTSTATUS nt_status;
 399         bool first = false;
 400         const char *reply_code;
 401         struct cli_credentials *creds;
 402
 403         static char *want_feature_list = NULL;
 404         static DATA_BLOB session_key;
 405
 406         TALLOC_CTX *mem_ctx;
 407
 408         if (*private1) {
 409                 state = (struct gensec_ntlm_state *)*private1;
 410         } else {
 411                 state = talloc_zero(NULL, struct gensec_ntlm_state);
 412                 if (!state) {
 413                         mux_printf(mux_id, "BH No Memory\n");
 414                         exit(1);
 415                 }
 416                 *private1 = state;
 417                 if (opt_password) {
 418                         state->set_password = opt_password;
 419                 }
 420         }
 421
 422         if (strlen(buf) < 2) {
 423                 DEBUG(1, ("query [%s] invalid", buf));
 424                 mux_printf(mux_id, "BH Query invalid\n");
 425                 return;
 426         }
 427
 428         if (strlen(buf) > 3) {
 429                 if(strncmp(buf, "SF ", 3) == 0) {
 430                         DEBUG(10, ("Setting flags to negotiate\n"));
 431                         talloc_free(want_feature_list);
 432                         want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
 433                         mux_printf(mux_id, "OK\n");
 434                         return;
 435                 }
 436                 in = base64_decode_data_blob(NULL, buf + 3);
 437         } else {
 438                 in = data_blob(NULL, 0);
 439         }
 440
 441         if (strncmp(buf, "YR", 2) == 0) {
 442                 if (state->gensec_state) {
 443                         talloc_free(state->gensec_state);
 444                         state->gensec_state = NULL;
 445                 }
 446         } else if ( (strncmp(buf, "OK", 2) == 0)) {
 447                 /* Just return BH, like ntlm_auth from Samba 3 does. */
 448                 mux_printf(mux_id, "BH Command expected\n");
 449                 data_blob_free(&in);
 450                 return;
 451         } else if ( (strncmp(buf, "TT ", 3) != 0) &&
 452                     (strncmp(buf, "KK ", 3) != 0) &&
 453                     (strncmp(buf, "AF ", 3) != 0) &&
 454                     (strncmp(buf, "NA ", 3) != 0) &&
 455                     (strncmp(buf, "UG", 2) != 0) &&
 456                     (strncmp(buf, "PW ", 3) != 0) &&
 457                     (strncmp(buf, "GK", 2) != 0) &&
 458                     (strncmp(buf, "GF", 2) != 0)) {
 459                 DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
 460                 mux_printf(mux_id, "BH SPNEGO request invalid\n");
 461                 data_blob_free(&in);
 462                 return;
 463         }
 464
 465         ev = s4_event_context_init(state);
 466         if (!ev) {
 467                 exit(1);
 468         }
 469
 470         mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
 471
 472         /* setup gensec */
 473         if (!(state->gensec_state)) {
 474                 switch (stdio_helper_mode) {
 475                 case GSS_SPNEGO_CLIENT:
 476                 case NTLMSSP_CLIENT_1:
 477                         /* setup the client side */
 478
 479                         nt_status = gensec_client_start(NULL, &state->gensec_state, ev,
 480                                                         lpcfg_gensec_settings(NULL, lp_ctx));
 481                         if (!NT_STATUS_IS_OK(nt_status)) {
 482                                 talloc_free(mem_ctx);
 483                                 exit(1);
 484                         }
 485
 486                         break;
 487                 case GSS_SPNEGO_SERVER:
 488                 case SQUID_2_5_NTLMSSP:
 489                 {
 490                         const char *winbind_method[] = { "winbind", NULL };
 491                         struct auth_context *auth_context;
 492
 493                         msg = messaging_client_init(state, lpcfg_messaging_path(state, lp_ctx), ev);
 494                         if (!msg) {
 495                                 talloc_free(mem_ctx);
 496                                 exit(1);
 497                         }
 498                         nt_status = auth_context_create_methods(mem_ctx,
 499                                                                 winbind_method,
 500                                                                 ev,
 501                                                                 msg,
 502                                                                 lp_ctx,
 503                                                                 NULL,
 504                                                                 &auth_context);
 505
 506                         if (!NT_STATUS_IS_OK(nt_status)) {
 507                                 talloc_free(mem_ctx);
 508                                 exit(1);
 509                         }
 510
 511                         if (!NT_STATUS_IS_OK(gensec_server_start(state, ev,
 512                                                                  lpcfg_gensec_settings(state, lp_ctx),
 513                                                                  auth_context, &state->gensec_state))) {
 514                                 talloc_free(mem_ctx);
 515                                 exit(1);
 516                         }
 517                         break;
 518                 }
 519                 default:
 520                         talloc_free(mem_ctx);
 521                         abort();
 522                 }
 523
 524                 creds = cli_credentials_init(state->gensec_state);
 525                 cli_credentials_set_conf(creds, lp_ctx);
 526                 if (opt_username) {
 527                         cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
 528                 }
 529                 if (opt_domain) {
 530                         cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
 531                 }
 532                 if (state->set_password) {
 533                         cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
 534                 } else {
 535                         cli_credentials_set_password_callback(creds, get_password);
 536                         creds->priv_data = (void*)(uintptr_t)mux_id;
 537                 }
 538                 if (opt_workstation) {
 539                         cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
 540                 }
 541
 542                 switch (stdio_helper_mode) {
 543                 case GSS_SPNEGO_SERVER:
 544                 case SQUID_2_5_NTLMSSP:
 545                         cli_credentials_set_machine_account(creds, lp_ctx);
 546                         break;
 547                 default:
 548                         break;
 549                 }
 550
 551                 gensec_set_credentials(state->gensec_state, creds);
 552                 gensec_want_feature_list(state->gensec_state, want_feature_list);
 553
 554                 switch (stdio_helper_mode) {
 555                 case GSS_SPNEGO_CLIENT:
 556                 case GSS_SPNEGO_SERVER:
 557                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
 558                         if (!in.length) {
 559                                 first = true;
 560                         }
 561                         break;
 562                 case NTLMSSP_CLIENT_1:
 563                         if (!in.length) {
 564                                 first = true;
 565                         }
 566                         /* fall through */
 567                 case SQUID_2_5_NTLMSSP:
 568                         nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
 569                         break;
 570                 default:
 571                         talloc_free(mem_ctx);
 572                         abort();
 573                 }
 574
 575                 if (!NT_STATUS_IS_OK(nt_status)) {
 576                         DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
 577                         mux_printf(mux_id, "BH GENSEC mech failed to start\n");
 578                         talloc_free(mem_ctx);
 579                         return;
 580                 }
 581
 582         }
 583
 584         /* update */
 585
 586         if (strncmp(buf, "PW ", 3) == 0) {
 587                 state->set_password = talloc_strndup(state,
 588                                                      (const char *)in.data,
 589                                                      in.length);
 590
 591                 cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
 592                                              state->set_password,
 593                                              CRED_SPECIFIED);
 594                 mux_printf(mux_id, "OK\n");
 595                 data_blob_free(&in);
 596                 talloc_free(mem_ctx);
 597                 return;
 598         }
 599
 600         if (strncmp(buf, "UG", 2) == 0) {
 601                 int i;
 602                 char *grouplist = NULL;
 603                 struct auth_session_info *session_info;
 604
 605                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 606                 if (!NT_STATUS_IS_OK(nt_status)) {
 607                         DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
 608                         mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
 609                         data_blob_free(&in);
 610                         talloc_free(mem_ctx);
 611                         return;
 612                 }
 613
 614                 /* get the string onto the context */
 615                 grouplist = talloc_strdup(mem_ctx, "");
 616
 617                 for (i=0; i<session_info->security_token->num_sids; i++) {
 618                         struct security_token *token = session_info->security_token;
 619                         const char *sidstr = dom_sid_string(session_info,
 620                                                             &token->sids[i]);
 621                         grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
 622                 }
 623
 624                 mux_printf(mux_id, "GL %s\n", grouplist);
 625                 talloc_free(session_info);
 626                 data_blob_free(&in);
 627                 talloc_free(mem_ctx);
 628                 return;
 629         }
 630
 631         if (strncmp(buf, "GK", 2) == 0) {
 632                 char *base64_key;
 633                 DEBUG(10, ("Requested session key\n"));
 634                 nt_status = gensec_session_key(state->gensec_state, &session_key);
 635                 if(!NT_STATUS_IS_OK(nt_status)) {
 636                         DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
 637                         mux_printf(mux_id, "BH No session key\n");
 638                         talloc_free(mem_ctx);
 639                         return;
 640                 } else {
 641                         base64_key = base64_encode_data_blob(state, session_key);
 642                         mux_printf(mux_id, "GK %s\n", base64_key);
 643                         talloc_free(base64_key);
 644                 }
 645                 talloc_free(mem_ctx);
 646                 return;
 647         }
 648
 649         if (strncmp(buf, "GF", 2) == 0) {
 650                 struct ntlmssp_state *ntlmssp_state;
 651                 uint32_t neg_flags;
 652
 653                 ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
 654                                 struct ntlmssp_state);
 655                 neg_flags = ntlmssp_state->neg_flags;
 656
 657                 DEBUG(10, ("Requested negotiated feature flags\n"));
 658                 mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
 659                 return;
 660         }
 661
 662         nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
 663
 664         /* don't leak 'bad password'/'no such user' info to the network client */
 665         nt_status = nt_status_squash(nt_status);
 666
 667         if (out.length) {
 668                 out_base64 = base64_encode_data_blob(mem_ctx, out);
 669         } else {
 670                 out_base64 = NULL;
 671         }
 672
 673         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 674                 reply_arg = "*";
 675                 if (first) {
 676                         reply_code = "YR";
 677                 } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 678                         reply_code = "KK";
 679                 } else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
 680                         reply_code = "TT";
 681                 } else {
 682                         abort();
 683                 }
 684
 685
 686         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
 687                 reply_code = "BH NT_STATUS_ACCESS_DENIED";
 688                 reply_arg = nt_errstr(nt_status);
 689                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 690         } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
 691                 reply_code = "BH NT_STATUS_UNSUCCESSFUL";
 692                 reply_arg = nt_errstr(nt_status);
 693                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 694         } else if (!NT_STATUS_IS_OK(nt_status)) {
 695                 reply_code = "NA";
 696                 reply_arg = nt_errstr(nt_status);
 697                 DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
 698         } else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
 699                 struct auth_session_info *session_info;
 700
 701                 nt_status = gensec_session_info(state->gensec_state, &session_info);
 702                 if (!NT_STATUS_IS_OK(nt_status)) {
 703                         reply_code = "BH Failed to retrive session info";
 704                         reply_arg = nt_errstr(nt_status);
 705                         DEBUG(1, ("GENSEC failed to retrieve the session info: %s\n", nt_errstr(nt_status)));
 706                 } else {
 707
 708                         reply_code = "AF";
 709                         reply_arg = talloc_asprintf(state->gensec_state,
 710                                                     "%s%s%s", session_info->info->domain_name,
 711                                                     lpcfg_winbind_separator(lp_ctx), session_info->info->account_name);
 712                         talloc_free(session_info);
 713                 }
 714         } else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
 715                 reply_code = "AF";
 716                 reply_arg = out_base64;
 717         } else {
 718                 abort();
 719         }
 720
 721         switch (stdio_helper_mode) {
 722         case GSS_SPNEGO_SERVER:
 723                 mux_printf(mux_id, "%s %s %s\n", reply_code,
 724                           out_base64 ? out_base64 : "*",
 725                           reply_arg ? reply_arg : "*");
 726                 break;
 727         default:
 728                 if (out_base64) {
 729                         mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
 730                 } else if (reply_arg) {
 731                         mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
 732                 } else {
 733                         mux_printf(mux_id, "%s\n", reply_code);
 734                 }
 735         }
 736
 737         talloc_free(mem_ctx);
 738         return;
 739 }
 740
 741 static void manage_ntlm_server_1_request(enum stdio_helper_mode stdio_helper_mode,
 742                                          struct loadparm_context *lp_ctx,
 743                                          char *buf, int length, void **private1,
 744                                          unsigned int mux_id, void **private2)
 745 {
 746         char *request, *parameter;
 747         static DATA_BLOB challenge;
 748         static DATA_BLOB lm_response;
 749         static DATA_BLOB nt_response;
 750         static char *full_username;
 751         static char *username;
 752         static char *domain;
 753         static char *plaintext_password;
 754         static bool ntlm_server_1_user_session_key;
 755         static bool ntlm_server_1_lm_session_key;
 756
 757         if (strequal(buf, ".")) {
 758                 if (!full_username && !username) {
 759                         mux_printf(mux_id, "Error: No username supplied!\n");
 760                 } else if (plaintext_password) {
 761                         /* handle this request as plaintext */
 762                         if (!full_username) {
 763                                 if (asprintf(&full_username, "%s%c%s", domain, *lpcfg_winbind_separator(lp_ctx), username) < 0) {
 764                                         mux_printf(mux_id, "Error: Out of memory in asprintf!\n.\n");
 765                                         return;
 766                                 }
 767                         }
 768                         if (check_plaintext_auth(full_username, plaintext_password, false)) {
 769                                 mux_printf(mux_id, "Authenticated: Yes\n");
 770                         } else {
 771                                 mux_printf(mux_id, "Authenticated: No\n");
 772                         }
 773                 } else if (!lm_response.data && !nt_response.data) {
 774                         mux_printf(mux_id, "Error: No password supplied!\n");
 775                 } else if (!challenge.data) {
 776                         mux_printf(mux_id, "Error: No lanman-challenge supplied!\n");
 777                 } else {
 778                         char *error_string = NULL;
 779                         DATA_BLOB lm_key;
 780                         DATA_BLOB user_session_key;
 781                         uint32_t flags = 0;
 782
 783                         if (full_username && !username) {
 784                                 SAFE_FREE(username);
 785                                 SAFE_FREE(domain);
 786                                 if (!parse_ntlm_auth_domain_user(full_username, &username,
 787                                                                                                  &domain,
 788                                                                                                  *lpcfg_winbind_separator(lp_ctx))) {
 789                                         /* username might be 'tainted', don't print into our new-line deleimianted stream */
 790                                         mux_printf(mux_id, "Error: Could not parse into domain and username\n");
 791                                 }
 792                         }
 793
 794                         if (!domain) {
 795                                 domain = smb_xstrdup(lpcfg_workgroup(lp_ctx));
 796                         }
 797
 798                         if (ntlm_server_1_lm_session_key)
 799                                 flags |= NTLM_AUTH_FLAG_LMKEY;
 800
 801                         if (ntlm_server_1_user_session_key)
 802                                 flags |= NTLM_AUTH_FLAG_USER_SESSION_KEY;
 803
 804                         if (!NT_STATUS_IS_OK(
 805                                     local_pw_check_specified(lp_ctx,
 806                                                              username,
 807                                                               domain,
 808                                                               lpcfg_netbios_name(lp_ctx),
 809                                                               &challenge,
 810                                                               &lm_response,
 811                                                               &nt_response,
 812                                                               flags,
 813                                                               &lm_key,
 814                                                               &user_session_key,
 815                                                               &error_string,
 816                                                               NULL))) {
 817
 818                                 mux_printf(mux_id, "Authenticated: No\n");
 819                                 mux_printf(mux_id, "Authentication-Error: %s\n.\n", error_string);
 820                                 SAFE_FREE(error_string);
 821                         } else {
 822                                 static char zeros[16];
 823                                 char *hex_lm_key;
 824                                 char *hex_user_session_key;
 825
 826                                 mux_printf(mux_id, "Authenticated: Yes\n");
 827
 828                                 if (ntlm_server_1_lm_session_key
 829                                     && lm_key.length
 830                                     && (memcmp(zeros, lm_key.data,
 831                                                                 lm_key.length) != 0)) {
 832                                         hex_encode(lm_key.data,
 833                                                    lm_key.length,
 834                                                    &hex_lm_key);
 835                                         mux_printf(mux_id, "LANMAN-Session-Key: %s\n", hex_lm_key);
 836                                         SAFE_FREE(hex_lm_key);
 837                                 }
 838
 839                                 if (ntlm_server_1_user_session_key
 840                                     && user_session_key.length
 841                                     && (memcmp(zeros, user_session_key.data,
 842                                                user_session_key.length) != 0)) {
 843                                         hex_encode(user_session_key.data,
 844                                                    user_session_key.length,
 845                                                    &hex_user_session_key);
 846                                         mux_printf(mux_id, "User-Session-Key: %s\n", hex_user_session_key);
 847                                         SAFE_FREE(hex_user_session_key);
 848                                 }
 849                         }
 850                 }
 851                 /* clear out the state */
 852                 challenge = data_blob(NULL, 0);
 853                 nt_response = data_blob(NULL, 0);
 854                 lm_response = data_blob(NULL, 0);
 855                 SAFE_FREE(full_username);
 856                 SAFE_FREE(username);
 857                 SAFE_FREE(domain);
 858                 SAFE_FREE(plaintext_password);
 859                 ntlm_server_1_user_session_key = false;
 860                 ntlm_server_1_lm_session_key = false;
 861                 mux_printf(mux_id, ".\n");
 862
 863                 return;
 864         }
 865
 866         request = buf;
 867
 868         /* Indicates a base64 encoded structure */
 869         parameter = strstr(request, ":: ");
 870         if (!parameter) {
 871                 parameter = strstr(request, ": ");
 872
 873                 if (!parameter) {
 874                         DEBUG(0, ("Parameter not found!\n"));
 875                         mux_printf(mux_id, "Error: Parameter not found!\n.\n");
 876                         return;
 877                 }
 878
 879                 parameter[0] ='\0';
 880                 parameter++;
 881                 parameter[0] ='\0';
 882                 parameter++;
 883
 884         } else {
 885                 parameter[0] ='\0';
 886                 parameter++;
 887                 parameter[0] ='\0';
 888                 parameter++;
 889                 parameter[0] ='\0';
 890                 parameter++;
 891
 892                 base64_decode_inplace(parameter);
 893         }
 894
 895         if (strequal(request, "LANMAN-Challenge")) {
 896                 challenge = strhex_to_data_blob(NULL, parameter);
 897                 if (challenge.length != 8) {
 898                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 8)\n.\n",
 899                                   parameter,
 900                                   (int)challenge.length);
 901                         challenge = data_blob(NULL, 0);
 902                 }
 903         } else if (strequal(request, "NT-Response")) {
 904                 nt_response = strhex_to_data_blob(NULL, parameter);
 905                 if (nt_response.length < 24) {
 906                         mux_printf(mux_id, "Error: hex decode of %s failed! (only got %d bytes, needed at least 24)\n.\n",
 907                                   parameter,
 908                                   (int)nt_response.length);
 909                         nt_response = data_blob(NULL, 0);
 910                 }
 911         } else if (strequal(request, "LANMAN-Response")) {
 912                 lm_response = strhex_to_data_blob(NULL, parameter);
 913                 if (lm_response.length != 24) {
 914                         mux_printf(mux_id, "Error: hex decode of %s failed! (got %d bytes, expected 24)\n.\n",
 915                                   parameter,
 916                                   (int)lm_response.length);
 917                         lm_response = data_blob(NULL, 0);
 918                 }
 919         } else if (strequal(request, "Password")) {
 920                 plaintext_password = smb_xstrdup(parameter);
 921         } else if (strequal(request, "NT-Domain")) {
 922                 domain = smb_xstrdup(parameter);
 923         } else if (strequal(request, "Username")) {
 924                 username = smb_xstrdup(parameter);
 925         } else if (strequal(request, "Full-Username")) {
 926                 full_username = smb_xstrdup(parameter);
 927         } else if (strequal(request, "Request-User-Session-Key")) {
 928                 ntlm_server_1_user_session_key = strequal(parameter, "Yes");
 929         } else if (strequal(request, "Request-LanMan-Session-Key")) {
 930                 ntlm_server_1_lm_session_key = strequal(parameter, "Yes");
 931         } else {
 932                 mux_printf(mux_id, "Error: Unknown request %s\n.\n", request);
 933         }
 934 }
 935
 936 static void manage_squid_request(struct loadparm_context *lp_ctx, enum stdio_helper_mode helper_mode,
 937                                  stdio_helper_function fn, void **private2)
 938 {
 939         char *buf;
 940         char tmp[INITIAL_BUFFER_SIZE+1];
 941         unsigned int mux_id = 0;
 942         int length, buf_size = 0;
 943         char *c;
 944         struct mux_private {
 945                 unsigned int max_mux;
 946                 void **private_pointers;
 947         };
 948
 949         static struct mux_private *mux_private;
 950         static void *normal_private;
 951         void **private1;
 952
 953         buf = talloc_strdup(NULL, "");
 954
 955         if (buf == NULL) {
 956                 DEBUG(0, ("Failed to allocate memory for reading the input "
 957                           "buffer.\n"));
 958                 x_fprintf(x_stdout, "ERR\n");
 959                 return;
 960         }
 961
 962         do {
 963                 /* this is not a typo - x_fgets doesn't work too well under
 964                  * squid */
 965                 if (fgets(tmp, INITIAL_BUFFER_SIZE, stdin) == NULL) {
 966                         if (ferror(stdin)) {
 967                                 DEBUG(1, ("fgets() failed! dying..... errno=%d "
 968                                           "(%s)\n", ferror(stdin),
 969                                           strerror(ferror(stdin))));
 970
 971                                 exit(1);    /* BIIG buffer */
 972                         }
 973                         exit(0);
 974                 }
 975
 976                 buf = talloc_strdup_append_buffer(buf, tmp);
 977                 buf_size += INITIAL_BUFFER_SIZE;
 978
 979                 if (buf_size > MAX_BUFFER_SIZE) {
 980                         DEBUG(0, ("Invalid Request (too large)\n"));
 981                         x_fprintf(x_stdout, "ERR\n");
 982                         talloc_free(buf);
 983                         return;
 984                 }
 985
 986                 c = strchr(buf, '\n');
 987         } while (c == NULL);
 988
 989         *c = '\0';
 990         length = c-buf;
 991
 992         DEBUG(10, ("Got '%s' from squid (length: %d).\n",buf,length));
 993
 994         if (buf[0] == '\0') {
 995                 DEBUG(0, ("Invalid Request (empty)\n"));
 996                 x_fprintf(x_stdout, "ERR\n");
 997                 talloc_free(buf);
 998                 return;
 999         }
1000
1001         if (opt_multiplex) {
1002                 if (sscanf(buf, "%u ", &mux_id) != 1) {
1003                         DEBUG(0, ("Invalid Request - no multiplex id\n"));
1004                         x_fprintf(x_stdout, "ERR\n");
1005                         talloc_free(buf);
1006                         return;
1007                 }
1008                 if (!mux_private) {
1009                         mux_private = talloc(NULL, struct mux_private);
1010                         mux_private->max_mux = 0;
1011                         mux_private->private_pointers = NULL;
1012                 }
1013
1014                 c=strchr(buf,' ');
1015                 if (!c) {
1016                         DEBUG(0, ("Invalid Request - no data after multiplex id\n"));
1017                         x_fprintf(x_stdout, "ERR\n");
1018                         talloc_free(buf);
1019                         return;
1020                 }
1021                 c++;
1022                 if (mux_id >= mux_private->max_mux) {
1023                         unsigned int prev_max = mux_private->max_mux;
1024                         mux_private->max_mux = mux_id + 1;
1025                         mux_private->private_pointers
1026                                 = talloc_realloc(mux_private,
1027                                                    mux_private->private_pointers,
1028                                                    void *, mux_private->max_mux);
1029                         memset(&mux_private->private_pointers[prev_max], '\0',
1030                                (sizeof(*mux_private->private_pointers) * (mux_private->max_mux - prev_max)));
1031                 };
1032
1033                 private1 = &mux_private->private_pointers[mux_id];
1034         } else {
1035                 c = buf;
1036                 private1 = &normal_private;
1037         }
1038
1039         fn(helper_mode, lp_ctx, c, length, private1, mux_id, private2);
1040         talloc_free(buf);
1041 }
1042
1043 static void squid_stream(struct loadparm_context *lp_ctx,
1044                          enum stdio_helper_mode stdio_mode,
1045                          stdio_helper_function fn) {
1046         /* initialize FDescs */
1047         x_setbuf(x_stdout, NULL);
1048         x_setbuf(x_stderr, NULL);
1049         while(1) {
1050                 manage_squid_request(lp_ctx, stdio_mode, fn, NULL);
1051         }
1052 }
1053
1054
1055 /* Main program */
1056
1057 enum {
1058         OPT_USERNAME = 1000,
1059         OPT_DOMAIN,
1060         OPT_WORKSTATION,
1061         OPT_CHALLENGE,
1062         OPT_RESPONSE,
1063         OPT_LM,
1064         OPT_NT,
1065         OPT_PASSWORD,
1066         OPT_LM_KEY,
1067         OPT_USER_SESSION_KEY,
1068         OPT_DIAGNOSTICS,
1069         OPT_REQUIRE_MEMBERSHIP,
1070         OPT_MULTIPLEX,
1071         OPT_USE_CACHED_CREDS,
1072 };
1073
1074 int main(int argc, const char **argv)
1075 {
1076         static const char *helper_protocol;
1077         int opt;
1078
1079         poptContext pc;
1080
1081         /* NOTE: DO NOT change this interface without considering the implications!
1082            This is an external interface, which other programs will use to interact
1083            with this helper.
1084         */
1085
1086         /* We do not use single-letter command abbreviations, because they harm future
1087            interface stability. */
1088
1089         struct poptOption long_options[] = {
1090                 POPT_AUTOHELP
1091                 { "helper-protocol", 0, POPT_ARG_STRING, &helper_protocol, OPT_DOMAIN, "operate as a stdio-based helper", "helper protocol to use"},
1092                 { "domain", 0, POPT_ARG_STRING, &opt_domain, OPT_DOMAIN, "domain name"},
1093                 { "workstation", 0, POPT_ARG_STRING, &opt_workstation, OPT_WORKSTATION, "workstation"},
1094                 { "username", 0, POPT_ARG_STRING, &opt_username, OPT_PASSWORD, "Username"},
1095                 { "password", 0, POPT_ARG_STRING, &opt_password, OPT_PASSWORD, "User's plaintext password"},
1096                 { "multiplex", 0, POPT_ARG_NONE, &opt_multiplex, OPT_MULTIPLEX, "Multiplex Mode"},
1097                 { "use-cached-creds", 0, POPT_ARG_NONE, &use_cached_creds, OPT_USE_CACHED_CREDS, "silently ignored for compatibility reasons"},
1098                 POPT_COMMON_SAMBA
1099                 POPT_COMMON_VERSION
1100                 { NULL }
1101         };
1102
1103         /* Samba client initialisation */
1104
1105         setup_logging(NULL, DEBUG_STDERR);
1106
1107         /* Parse options */
1108
1109         pc = poptGetContext("ntlm_auth", argc, argv, long_options, 0);
1110
1111         /* Parse command line options */
1112
1113         if (argc == 1) {
1114                 poptPrintHelp(pc, stderr, 0);
1115                 return 1;
1116         }
1117
1118         pc = poptGetContext(NULL, argc, (const char **)argv, long_options,
1119                             POPT_CONTEXT_KEEP_FIRST);
1120
1121         while((opt = poptGetNextOpt(pc)) != -1) {
1122                 if (opt < -1) {
1123                         break;
1124                 }
1125         }
1126         if (opt < -1) {
1127                 fprintf(stderr, "%s: %s\n",
1128                         poptBadOption(pc, POPT_BADOPTION_NOALIAS),
1129                         poptStrerror(opt));
1130                 return 1;
1131         }
1132
1133         gensec_init(cmdline_lp_ctx);
1134
1135         if (opt_domain == NULL) {
1136                 opt_domain = lpcfg_workgroup(cmdline_lp_ctx);
1137         }
1138
1139         if (helper_protocol) {
1140                 int i;
1141                 for (i=0; i<NUM_HELPER_MODES; i++) {
1142                         if (strcmp(helper_protocol, stdio_helper_protocols[i].name) == 0) {
1143                                 squid_stream(cmdline_lp_ctx, stdio_helper_protocols[i].mode, stdio_helper_protocols[i].fn);
1144                                 exit(0);
1145                         }
1146                 }
1147                 x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
1148
1149                 for (i=0; i<NUM_HELPER_MODES; i++) {
1150                         x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
1151                 }
1152
1153                 exit(1);
1154         }
1155
1156         if (!opt_username) {
1157                 x_fprintf(x_stderr, "username must be specified!\n\n");
1158                 poptPrintHelp(pc, stderr, 0);
1159                 exit(1);
1160         }
1161
1162         if (opt_workstation == NULL) {
1163                 opt_workstation = lpcfg_netbios_name(cmdline_lp_ctx);
1164         }
1165
1166         if (!opt_password) {
1167                 opt_password = getpass("password: ");
1168         }
1169
1170         {
1171                 char *user;
1172
1173                 if (asprintf(&user, "%s%c%s", opt_domain,
1174                              *lpcfg_winbind_separator(cmdline_lp_ctx),
1175                              opt_username) < 0) {
1176                         return 1;
1177                 }
1178                 if (!check_plaintext_auth(user, opt_password, true)) {
1179                         return 1;
1180                 }
1181         }
1182
1183         /* Exit code */
1184
1185         poptFreeContext(pc);
1186         return 0;
1187 }