auth/credentials/credentials.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    User credentials handling
   5
   6    Copyright (C) Jelmer Vernooij 2005
   7    Copyright (C) Tim Potter 2001
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   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 "librpc/gen_ndr/samr.h" /* for struct samrPassword */
  26 #include "auth/credentials/credentials.h"
  27 #include "auth/credentials/credentials_internal.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "tevent.h"
  31 #include "param/param.h"
  32 #include "system/filesys.h"
  33
  34 /**
  35  * Create a new credentials structure
  36  * @param mem_ctx TALLOC_CTX parent for credentials structure
  37  */
  38 _PUBLIC_ struct cli_credentials *cli_credentials_init(TALLOC_CTX *mem_ctx)
  39 {
  40         struct cli_credentials *cred = talloc_zero(mem_ctx, struct cli_credentials);
  41         if (cred == NULL) {
  42                 return cred;
  43         }
  44
  45         cred->winbind_separator = '\\';
  46
  47         return cred;
  48 }
  49
  50 _PUBLIC_ void cli_credentials_set_callback_data(struct cli_credentials *cred,
  51                                                 void *callback_data)
  52 {
  53         cred->priv_data = callback_data;
  54 }
  55
  56 _PUBLIC_ void *_cli_credentials_callback_data(struct cli_credentials *cred)
  57 {
  58         return cred->priv_data;
  59 }
  60
  61 /**
  62  * Create a new anonymous credential
  63  * @param mem_ctx TALLOC_CTX parent for credentials structure
  64  */
  65 _PUBLIC_ struct cli_credentials *cli_credentials_init_anon(TALLOC_CTX *mem_ctx)
  66 {
  67         struct cli_credentials *anon_credentials;
  68
  69         anon_credentials = cli_credentials_init(mem_ctx);
  70         cli_credentials_set_anonymous(anon_credentials);
  71
  72         return anon_credentials;
  73 }
  74
  75 _PUBLIC_ void cli_credentials_set_kerberos_state(struct cli_credentials *creds,
  76                                         enum credentials_use_kerberos use_kerberos)
  77 {
  78         creds->use_kerberos = use_kerberos;
  79 }
  80
  81 _PUBLIC_ void cli_credentials_set_forced_sasl_mech(struct cli_credentials *creds,
  82                                                    const char *sasl_mech)
  83 {
  84         TALLOC_FREE(creds->forced_sasl_mech);
  85         creds->forced_sasl_mech = talloc_strdup(creds, sasl_mech);
  86 }
  87
  88 _PUBLIC_ void cli_credentials_set_krb_forwardable(struct cli_credentials *creds,
  89                                                   enum credentials_krb_forwardable krb_forwardable)
  90 {
  91         creds->krb_forwardable = krb_forwardable;
  92 }
  93
  94 _PUBLIC_ enum credentials_use_kerberos cli_credentials_get_kerberos_state(struct cli_credentials *creds)
  95 {
  96         return creds->use_kerberos;
  97 }
  98
  99 _PUBLIC_ const char *cli_credentials_get_forced_sasl_mech(struct cli_credentials *creds)
 100 {
 101         return creds->forced_sasl_mech;
 102 }
 103
 104 _PUBLIC_ enum credentials_krb_forwardable cli_credentials_get_krb_forwardable(struct cli_credentials *creds)
 105 {
 106         return creds->krb_forwardable;
 107 }
 108
 109 _PUBLIC_ void cli_credentials_set_gensec_features(struct cli_credentials *creds, uint32_t gensec_features)
 110 {
 111         creds->gensec_features = gensec_features;
 112 }
 113
 114 _PUBLIC_ uint32_t cli_credentials_get_gensec_features(struct cli_credentials *creds)
 115 {
 116         return creds->gensec_features;
 117 }
 118
 119
 120 /**
 121  * Obtain the username for this credentials context.
 122  * @param cred credentials context
 123  * @retval The username set on this context.
 124  * @note Return value will never be NULL except by programmer error.
 125  */
 126 _PUBLIC_ const char *cli_credentials_get_username(struct cli_credentials *cred)
 127 {
 128         if (cred->machine_account_pending) {
 129                 cli_credentials_set_machine_account(cred,
 130                                         cred->machine_account_pending_lp_ctx);
 131         }
 132
 133         if (cred->username_obtained == CRED_CALLBACK &&
 134             !cred->callback_running) {
 135                 cred->callback_running = true;
 136                 cred->username = cred->username_cb(cred);
 137                 cred->callback_running = false;
 138                 if (cred->username_obtained == CRED_CALLBACK) {
 139                         cred->username_obtained = CRED_CALLBACK_RESULT;
 140                         cli_credentials_invalidate_ccache(cred, cred->username_obtained);
 141                 }
 142         }
 143
 144         return cred->username;
 145 }
 146
 147 _PUBLIC_ bool cli_credentials_set_username(struct cli_credentials *cred,
 148                                   const char *val, enum credentials_obtained obtained)
 149 {
 150         if (obtained >= cred->username_obtained) {
 151                 cred->username = talloc_strdup(cred, val);
 152                 cred->username_obtained = obtained;
 153                 cli_credentials_invalidate_ccache(cred, cred->username_obtained);
 154                 return true;
 155         }
 156
 157         return false;
 158 }
 159
 160 _PUBLIC_ bool cli_credentials_set_username_callback(struct cli_credentials *cred,
 161                                   const char *(*username_cb) (struct cli_credentials *))
 162 {
 163         if (cred->username_obtained < CRED_CALLBACK) {
 164                 cred->username_cb = username_cb;
 165                 cred->username_obtained = CRED_CALLBACK;
 166                 return true;
 167         }
 168
 169         return false;
 170 }
 171
 172 _PUBLIC_ bool cli_credentials_set_bind_dn(struct cli_credentials *cred,
 173                                  const char *bind_dn)
 174 {
 175         cred->bind_dn = talloc_strdup(cred, bind_dn);
 176         return true;
 177 }
 178
 179 /**
 180  * Obtain the BIND DN for this credentials context.
 181  * @param cred credentials context
 182  * @retval The username set on this context.
 183  * @note Return value will be NULL if not specified explictly
 184  */
 185 _PUBLIC_ const char *cli_credentials_get_bind_dn(struct cli_credentials *cred)
 186 {
 187         return cred->bind_dn;
 188 }
 189
 190
 191 /**
 192  * Obtain the client principal for this credentials context.
 193  * @param cred credentials context
 194  * @retval The username set on this context.
 195  * @note Return value will never be NULL except by programmer error.
 196  */
 197 _PUBLIC_ char *cli_credentials_get_principal_and_obtained(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, enum credentials_obtained *obtained)
 198 {
 199         const char *username = cli_credentials_get_username(cred);
 200         const char *p;
 201
 202         if (cred->machine_account_pending) {
 203                 cli_credentials_set_machine_account(cred,
 204                                         cred->machine_account_pending_lp_ctx);
 205         }
 206
 207         if (cred->principal_obtained == CRED_CALLBACK &&
 208             !cred->callback_running) {
 209                 cred->callback_running = true;
 210                 cred->principal = cred->principal_cb(cred);
 211                 cred->callback_running = false;
 212                 if (cred->principal_obtained == CRED_CALLBACK) {
 213                         cred->principal_obtained = CRED_CALLBACK_RESULT;
 214                         cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
 215                 }
 216         }
 217
 218         p = strchr_m(username, '@');
 219         if (p != NULL) {
 220                 *obtained = cred->username_obtained;
 221                 return talloc_strdup(mem_ctx, username);
 222         }
 223
 224         if (cred->principal_obtained < cred->username_obtained
 225             || cred->principal_obtained < MAX(cred->domain_obtained, cred->realm_obtained)) {
 226                 const char *effective_username = NULL;
 227                 const char *effective_realm = NULL;
 228                 enum credentials_obtained effective_obtained;
 229
 230                 effective_username = cli_credentials_get_username(cred);
 231                 if (effective_username == NULL || strlen(effective_username) == 0) {
 232                         *obtained = cred->username_obtained;
 233                         return NULL;
 234                 }
 235
 236                 if (cred->domain_obtained > cred->realm_obtained) {
 237                         effective_realm = cli_credentials_get_domain(cred);
 238                         effective_obtained = MIN(cred->domain_obtained,
 239                                                  cred->username_obtained);
 240                 } else {
 241                         effective_realm = cli_credentials_get_realm(cred);
 242                         effective_obtained = MIN(cred->realm_obtained,
 243                                                  cred->username_obtained);
 244                 }
 245
 246                 if (effective_realm == NULL || strlen(effective_realm) == 0) {
 247                         effective_realm = cli_credentials_get_domain(cred);
 248                         effective_obtained = MIN(cred->domain_obtained,
 249                                                  cred->username_obtained);
 250                 }
 251
 252                 if (effective_realm != NULL && strlen(effective_realm) != 0) {
 253                         *obtained = effective_obtained;
 254                         return talloc_asprintf(mem_ctx, "%s@%s",
 255                                                effective_username,
 256                                                effective_realm);
 257                 }
 258         }
 259         *obtained = cred->principal_obtained;
 260         return talloc_strdup(mem_ctx, cred->principal);
 261 }
 262
 263 /**
 264  * Obtain the client principal for this credentials context.
 265  * @param cred credentials context
 266  * @retval The username set on this context.
 267  * @note Return value will never be NULL except by programmer error.
 268  */
 269 _PUBLIC_ char *cli_credentials_get_principal(struct cli_credentials *cred, TALLOC_CTX *mem_ctx)
 270 {
 271         enum credentials_obtained obtained;
 272         return cli_credentials_get_principal_and_obtained(cred, mem_ctx, &obtained);
 273 }
 274
 275 /**
 276  * @brief Set a new principal to the credential cache.
 277  *
 278  * @note When setting a new principal, you should make sure to reinit the cache
 279  * afterwards!
 280  *
 281  * @param[in]  cred     The credentials to set the principal on.
 282  *
 283  * @param[in]  val      The principal as a string to set.
 284  *
 285  * @param[in]  obtained  The way the principal has specified.
 286  *
 287  * @return true on success, false otherwise.
 288  */
 289 _PUBLIC_ bool cli_credentials_set_principal(struct cli_credentials *cred,
 290                                    const char *val,
 291                                    enum credentials_obtained obtained)
 292 {
 293         if (obtained >= cred->principal_obtained) {
 294                 cred->principal = talloc_strdup(cred, val);
 295                 if (cred->principal == NULL) {
 296                         return false;
 297                 }
 298                 cred->principal_obtained = obtained;
 299
 300                 return true;
 301         }
 302
 303         return false;
 304 }
 305
 306 /* Set a callback to get the principal.  This could be a popup dialog,
 307  * a terminal prompt or similar.  */
 308 _PUBLIC_ bool cli_credentials_set_principal_callback(struct cli_credentials *cred,
 309                                   const char *(*principal_cb) (struct cli_credentials *))
 310 {
 311         if (cred->principal_obtained < CRED_CALLBACK) {
 312                 cred->principal_cb = principal_cb;
 313                 cred->principal_obtained = CRED_CALLBACK;
 314                 return true;
 315         }
 316
 317         return false;
 318 }
 319
 320 /* Some of our tools are 'anonymous by default'.  This is a single
 321  * function to determine if authentication has been explicitly
 322  * requested */
 323
 324 _PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *cred)
 325 {
 326         uint32_t gensec_features = 0;
 327
 328         if (cred->bind_dn) {
 329                 return true;
 330         }
 331
 332         /*
 333          * If we forced the mech we clearly want authentication. E.g. to use
 334          * SASL/EXTERNAL which has no credentials.
 335          */
 336         if (cred->forced_sasl_mech) {
 337                 return true;
 338         }
 339
 340         if (cli_credentials_is_anonymous(cred)){
 341                 return false;
 342         }
 343
 344         if (cred->principal_obtained >= CRED_SPECIFIED) {
 345                 return true;
 346         }
 347         if (cred->username_obtained >= CRED_SPECIFIED) {
 348                 return true;
 349         }
 350
 351         if (cli_credentials_get_kerberos_state(cred) == CRED_MUST_USE_KERBEROS) {
 352                 return true;
 353         }
 354
 355         gensec_features = cli_credentials_get_gensec_features(cred);
 356         if (gensec_features & GENSEC_FEATURE_NTLM_CCACHE) {
 357                 return true;
 358         }
 359
 360         if (gensec_features & GENSEC_FEATURE_SIGN) {
 361                 return true;
 362         }
 363
 364         if (gensec_features & GENSEC_FEATURE_SEAL) {
 365                 return true;
 366         }
 367
 368         return false;
 369 }
 370
 371 /**
 372  * Obtain the password for this credentials context.
 373  * @param cred credentials context
 374  * @retval If set, the cleartext password, otherwise NULL
 375  */
 376 _PUBLIC_ const char *cli_credentials_get_password(struct cli_credentials *cred)
 377 {
 378         if (cred->machine_account_pending) {
 379                 cli_credentials_set_machine_account(cred,
 380                                                     cred->machine_account_pending_lp_ctx);
 381         }
 382
 383         if (cred->password_obtained == CRED_CALLBACK &&
 384             !cred->callback_running &&
 385             !cred->password_will_be_nt_hash) {
 386                 cred->callback_running = true;
 387                 cred->password = cred->password_cb(cred);
 388                 cred->callback_running = false;
 389                 if (cred->password_obtained == CRED_CALLBACK) {
 390                         cred->password_obtained = CRED_CALLBACK_RESULT;
 391                         cli_credentials_invalidate_ccache(cred, cred->password_obtained);
 392                 }
 393         }
 394
 395         return cred->password;
 396 }
 397
 398 /* Set a password on the credentials context, including an indication
 399  * of 'how' the password was obtained */
 400
 401 _PUBLIC_ bool cli_credentials_set_password(struct cli_credentials *cred,
 402                                   const char *val,
 403                                   enum credentials_obtained obtained)
 404 {
 405         if (obtained >= cred->password_obtained) {
 406
 407                 cred->lm_response = data_blob_null;
 408                 cred->nt_response = data_blob_null;
 409                 cred->nt_hash = NULL;
 410                 cred->password = NULL;
 411
 412                 cli_credentials_invalidate_ccache(cred, obtained);
 413
 414                 cred->password_tries = 0;
 415
 416                 if (val == NULL) {
 417                         cred->password_obtained = obtained;
 418                         return true;
 419                 }
 420
 421                 if (cred->password_will_be_nt_hash) {
 422                         struct samr_Password *nt_hash = NULL;
 423                         size_t val_len = strlen(val);
 424                         size_t converted;
 425
 426                         nt_hash = talloc(cred, struct samr_Password);
 427                         if (nt_hash == NULL) {
 428                                 return false;
 429                         }
 430
 431                         converted = strhex_to_str((char *)nt_hash->hash,
 432                                                   sizeof(nt_hash->hash),
 433                                                   val, val_len);
 434                         if (converted != sizeof(nt_hash->hash)) {
 435                                 TALLOC_FREE(nt_hash);
 436                                 return false;
 437                         }
 438
 439                         cred->nt_hash = nt_hash;
 440                         cred->password_obtained = obtained;
 441                         return true;
 442                 }
 443
 444                 cred->password = talloc_strdup(cred, val);
 445                 if (cred->password == NULL) {
 446                         return false;
 447                 }
 448
 449                 /* Don't print the actual password in talloc memory dumps */
 450                 talloc_set_name_const(cred->password,
 451                         "password set via cli_credentials_set_password");
 452                 cred->password_obtained = obtained;
 453
 454                 return true;
 455         }
 456
 457         return false;
 458 }
 459
 460 _PUBLIC_ bool cli_credentials_set_password_callback(struct cli_credentials *cred,
 461                                            const char *(*password_cb) (struct cli_credentials *))
 462 {
 463         if (cred->password_obtained < CRED_CALLBACK) {
 464                 cred->password_tries = 3;
 465                 cred->password_cb = password_cb;
 466                 cred->password_obtained = CRED_CALLBACK;
 467                 cli_credentials_invalidate_ccache(cred, cred->password_obtained);
 468                 return true;
 469         }
 470
 471         return false;
 472 }
 473
 474 /**
 475  * Obtain the 'old' password for this credentials context (used for join accounts).
 476  * @param cred credentials context
 477  * @retval If set, the cleartext password, otherwise NULL
 478  */
 479 _PUBLIC_ const char *cli_credentials_get_old_password(struct cli_credentials *cred)
 480 {
 481         if (cred->machine_account_pending) {
 482                 cli_credentials_set_machine_account(cred,
 483                                                     cred->machine_account_pending_lp_ctx);
 484         }
 485
 486         return cred->old_password;
 487 }
 488
 489 _PUBLIC_ bool cli_credentials_set_old_password(struct cli_credentials *cred,
 490                                       const char *val,
 491                                       enum credentials_obtained obtained)
 492 {
 493         cred->old_password = talloc_strdup(cred, val);
 494         if (cred->old_password) {
 495                 /* Don't print the actual password in talloc memory dumps */
 496                 talloc_set_name_const(cred->old_password, "password set via cli_credentials_set_old_password");
 497         }
 498         cred->old_nt_hash = NULL;
 499         return true;
 500 }
 501
 502 /**
 503  * Obtain the password, in the form MD4(unicode(password)) for this credentials context.
 504  *
 505  * Sometimes we only have this much of the password, while the rest of
 506  * the time this call avoids calling E_md4hash themselves.
 507  *
 508  * @param cred credentials context
 509  * @retval If set, the cleartext password, otherwise NULL
 510  */
 511 _PUBLIC_ struct samr_Password *cli_credentials_get_nt_hash(struct cli_credentials *cred,
 512                                                            TALLOC_CTX *mem_ctx)
 513 {
 514         enum credentials_obtained password_obtained;
 515         enum credentials_obtained ccache_threshold;
 516         enum credentials_obtained client_gss_creds_threshold;
 517         bool password_is_nt_hash;
 518         const char *password = NULL;
 519         struct samr_Password *nt_hash = NULL;
 520
 521         if (cred->nt_hash != NULL) {
 522                 /*
 523                  * If we already have a hash it's easy.
 524                  */
 525                 goto return_hash;
 526         }
 527
 528         /*
 529          * This is a bit tricky, with password_will_be_nt_hash
 530          * we still need to get the value via the password_callback
 531          * but if we did that we should not remember it's state
 532          * in the long run so we need to undo it.
 533          */
 534
 535         password_obtained = cred->password_obtained;
 536         ccache_threshold = cred->ccache_threshold;
 537         client_gss_creds_threshold = cred->client_gss_creds_threshold;
 538         password_is_nt_hash = cred->password_will_be_nt_hash;
 539
 540         cred->password_will_be_nt_hash = false;
 541         password = cli_credentials_get_password(cred);
 542
 543         cred->password_will_be_nt_hash = password_is_nt_hash;
 544         if (password_is_nt_hash && password_obtained == CRED_CALLBACK) {
 545                 /*
 546                  * We got the nt_hash as string via the callback,
 547                  * so we need to undo the state change.
 548                  *
 549                  * And also don't remember it as plaintext password.
 550                  */
 551                 cred->client_gss_creds_threshold = client_gss_creds_threshold;
 552                 cred->ccache_threshold = ccache_threshold;
 553                 cred->password_obtained = password_obtained;
 554                 cred->password = NULL;
 555         }
 556
 557         if (password == NULL) {
 558                 return NULL;
 559         }
 560
 561         nt_hash = talloc(cred, struct samr_Password);
 562         if (nt_hash == NULL) {
 563                 return NULL;
 564         }
 565
 566         if (password_is_nt_hash) {
 567                 size_t password_len = strlen(password);
 568                 size_t converted;
 569
 570                 converted = strhex_to_str((char *)nt_hash->hash,
 571                                           sizeof(nt_hash->hash),
 572                                           password, password_len);
 573                 if (converted != sizeof(nt_hash->hash)) {
 574                         TALLOC_FREE(nt_hash);
 575                         return NULL;
 576                 }
 577         } else {
 578                 E_md4hash(password, nt_hash->hash);
 579         }
 580
 581         cred->nt_hash = nt_hash;
 582         nt_hash = NULL;
 583
 584 return_hash:
 585         nt_hash = talloc(mem_ctx, struct samr_Password);
 586         if (nt_hash == NULL) {
 587                 return NULL;
 588         }
 589
 590         *nt_hash = *cred->nt_hash;
 591
 592         return nt_hash;
 593 }
 594
 595 /**
 596  * Obtain the old password, in the form MD4(unicode(password)) for this credentials context.
 597  *
 598  * Sometimes we only have this much of the password, while the rest of
 599  * the time this call avoids calling E_md4hash themselves.
 600  *
 601  * @param cred credentials context
 602  * @retval If set, the cleartext password, otherwise NULL
 603  */
 604 _PUBLIC_ struct samr_Password *cli_credentials_get_old_nt_hash(struct cli_credentials *cred,
 605                                                                TALLOC_CTX *mem_ctx)
 606 {
 607         const char *old_password = NULL;
 608
 609         if (cred->old_nt_hash != NULL) {
 610                 struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
 611                 if (!nt_hash) {
 612                         return NULL;
 613                 }
 614
 615                 *nt_hash = *cred->old_nt_hash;
 616
 617                 return nt_hash;
 618         }
 619
 620         old_password = cli_credentials_get_old_password(cred);
 621         if (old_password) {
 622                 struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
 623                 if (!nt_hash) {
 624                         return NULL;
 625                 }
 626
 627                 E_md4hash(old_password, nt_hash->hash);
 628
 629                 return nt_hash;
 630         }
 631
 632         return NULL;
 633 }
 634
 635 /**
 636  * Obtain the 'short' or 'NetBIOS' domain for this credentials context.
 637  * @param cred credentials context
 638  * @retval The domain set on this context.
 639  * @note Return value will never be NULL except by programmer error.
 640  */
 641 _PUBLIC_ const char *cli_credentials_get_domain(struct cli_credentials *cred)
 642 {
 643         if (cred->machine_account_pending) {
 644                 cli_credentials_set_machine_account(cred,
 645                                                     cred->machine_account_pending_lp_ctx);
 646         }
 647
 648         if (cred->domain_obtained == CRED_CALLBACK &&
 649             !cred->callback_running) {
 650                 cred->callback_running = true;
 651                 cred->domain = cred->domain_cb(cred);
 652                 cred->callback_running = false;
 653                 if (cred->domain_obtained == CRED_CALLBACK) {
 654                         cred->domain_obtained = CRED_CALLBACK_RESULT;
 655                         cli_credentials_invalidate_ccache(cred, cred->domain_obtained);
 656                 }
 657         }
 658
 659         return cred->domain;
 660 }
 661
 662
 663 _PUBLIC_ bool cli_credentials_set_domain(struct cli_credentials *cred,
 664                                 const char *val,
 665                                 enum credentials_obtained obtained)
 666 {
 667         if (obtained >= cred->domain_obtained) {
 668                 /* it is important that the domain be in upper case,
 669                  * particularly for the sensitive NTLMv2
 670                  * calculations */
 671                 cred->domain = strupper_talloc(cred, val);
 672                 cred->domain_obtained = obtained;
 673                 /* setting domain does not mean we have to invalidate ccache
 674                  * because domain in not used for Kerberos operations.
 675                  * If ccache invalidation is required, one will anyway specify
 676                  * a password to kinit, and that will force invalidation of the ccache
 677                  */
 678                 return true;
 679         }
 680
 681         return false;
 682 }
 683
 684 bool cli_credentials_set_domain_callback(struct cli_credentials *cred,
 685                                          const char *(*domain_cb) (struct cli_credentials *))
 686 {
 687         if (cred->domain_obtained < CRED_CALLBACK) {
 688                 cred->domain_cb = domain_cb;
 689                 cred->domain_obtained = CRED_CALLBACK;
 690                 return true;
 691         }
 692
 693         return false;
 694 }
 695
 696 /**
 697  * Obtain the Kerberos realm for this credentials context.
 698  * @param cred credentials context
 699  * @retval The realm set on this context.
 700  * @note Return value will never be NULL except by programmer error.
 701  */
 702 _PUBLIC_ const char *cli_credentials_get_realm(struct cli_credentials *cred)
 703 {
 704         if (cred->machine_account_pending) {
 705                 cli_credentials_set_machine_account(cred,
 706                                                     cred->machine_account_pending_lp_ctx);
 707         }
 708
 709         if (cred->realm_obtained == CRED_CALLBACK &&
 710             !cred->callback_running) {
 711                 cred->callback_running = true;
 712                 cred->realm = cred->realm_cb(cred);
 713                 cred->callback_running = false;
 714                 if (cred->realm_obtained == CRED_CALLBACK) {
 715                         cred->realm_obtained = CRED_CALLBACK_RESULT;
 716                         cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
 717                 }
 718         }
 719
 720         return cred->realm;
 721 }
 722
 723 /**
 724  * Set the realm for this credentials context, and force it to
 725  * uppercase for the sanity of our local kerberos libraries
 726  */
 727 _PUBLIC_ bool cli_credentials_set_realm(struct cli_credentials *cred,
 728                                const char *val,
 729                                enum credentials_obtained obtained)
 730 {
 731         if (obtained >= cred->realm_obtained) {
 732                 cred->realm = strupper_talloc(cred, val);
 733                 cred->realm_obtained = obtained;
 734                 cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
 735                 return true;
 736         }
 737
 738         return false;
 739 }
 740
 741 bool cli_credentials_set_realm_callback(struct cli_credentials *cred,
 742                                         const char *(*realm_cb) (struct cli_credentials *))
 743 {
 744         if (cred->realm_obtained < CRED_CALLBACK) {
 745                 cred->realm_cb = realm_cb;
 746                 cred->realm_obtained = CRED_CALLBACK;
 747                 return true;
 748         }
 749
 750         return false;
 751 }
 752
 753 /**
 754  * Obtain the 'short' or 'NetBIOS' workstation name for this credentials context.
 755  *
 756  * @param cred credentials context
 757  * @retval The workstation name set on this context.
 758  * @note Return value will never be NULL except by programmer error.
 759  */
 760 _PUBLIC_ const char *cli_credentials_get_workstation(struct cli_credentials *cred)
 761 {
 762         if (cred->workstation_obtained == CRED_CALLBACK &&
 763             !cred->callback_running) {
 764                 cred->callback_running = true;
 765                 cred->workstation = cred->workstation_cb(cred);
 766                 cred->callback_running = false;
 767                 if (cred->workstation_obtained == CRED_CALLBACK) {
 768                         cred->workstation_obtained = CRED_CALLBACK_RESULT;
 769                 }
 770         }
 771
 772         return cred->workstation;
 773 }
 774
 775 _PUBLIC_ bool cli_credentials_set_workstation(struct cli_credentials *cred,
 776                                      const char *val,
 777                                      enum credentials_obtained obtained)
 778 {
 779         if (obtained >= cred->workstation_obtained) {
 780                 cred->workstation = talloc_strdup(cred, val);
 781                 cred->workstation_obtained = obtained;
 782                 return true;
 783         }
 784
 785         return false;
 786 }
 787
 788 bool cli_credentials_set_workstation_callback(struct cli_credentials *cred,
 789                                               const char *(*workstation_cb) (struct cli_credentials *))
 790 {
 791         if (cred->workstation_obtained < CRED_CALLBACK) {
 792                 cred->workstation_cb = workstation_cb;
 793                 cred->workstation_obtained = CRED_CALLBACK;
 794                 return true;
 795         }
 796
 797         return false;
 798 }
 799
 800 /**
 801  * Given a string, typically obtained from a -U argument, parse it into domain, username, realm and password fields
 802  *
 803  * The format accepted is [domain\\]user[%password] or user[@realm][%password]
 804  *
 805  * @param credentials Credentials structure on which to set the password
 806  * @param data the string containing the username, password etc
 807  * @param obtained This enum describes how 'specified' this password is
 808  */
 809
 810 _PUBLIC_ void cli_credentials_parse_string(struct cli_credentials *credentials, const char *data, enum credentials_obtained obtained)
 811 {
 812         char *uname, *p;
 813
 814         if (strcmp("%",data) == 0) {
 815                 cli_credentials_set_anonymous(credentials);
 816                 return;
 817         }
 818
 819         uname = talloc_strdup(credentials, data);
 820         if ((p = strchr_m(uname,'%'))) {
 821                 const char *password;
 822
 823                 *p = '\0';
 824                 password = p + 1;
 825                 if (password[0] != '\0') {
 826                         cli_credentials_set_password(credentials,
 827                                                      password,
 828                                                      obtained);
 829                 }
 830         }
 831
 832         if ((p = strchr_m(uname,'@'))) {
 833                 const char *realm = p + 1;
 834
 835                 if (realm[0] == '\0') {
 836                         *p = 0;
 837
 838                         /*
 839                          * We also need to set username and domain
 840                          * in order to undo the effect of
 841                          * cli_credentials_guess().
 842                          */
 843                         cli_credentials_set_username(credentials,
 844                                                      uname,
 845                                                      obtained);
 846                         cli_credentials_set_domain(credentials, "", obtained);
 847                 } else {
 848                         cli_credentials_set_principal(credentials,
 849                                                       uname,
 850                                                       obtained);
 851                         *p = 0;
 852
 853                         cli_credentials_set_realm(credentials, realm, obtained);
 854                 }
 855                 return;
 856         } else if ((p = strchr_m(uname,'\\'))
 857                    || (p = strchr_m(uname, '/'))
 858                    || (p = strchr_m(uname, credentials->winbind_separator)))
 859         {
 860                 const char *domain = NULL;
 861
 862                 domain = uname;
 863                 *p = 0;
 864                 uname = p+1;
 865
 866                 if (obtained == credentials->realm_obtained &&
 867                     !strequal_m(credentials->domain, domain))
 868                 {
 869                         /*
 870                          * We need to undo a former set with the same level
 871                          * in order to get the expected result from
 872                          * cli_credentials_get_principal().
 873                          *
 874                          * But we only need to do that if the domain
 875                          * actually changes.
 876                          */
 877                         cli_credentials_set_realm(credentials, domain, obtained);
 878                 }
 879                 cli_credentials_set_domain(credentials, domain, obtained);
 880         }
 881         if (obtained == credentials->principal_obtained &&
 882             !strequal_m(credentials->username, uname))
 883         {
 884                 /*
 885                  * We need to undo a former set with the same level
 886                  * in order to get the expected result from
 887                  * cli_credentials_get_principal().
 888                  *
 889                  * But we only need to do that if the username
 890                  * actually changes.
 891                  */
 892                 credentials->principal_obtained = CRED_UNINITIALISED;
 893                 credentials->principal = NULL;
 894         }
 895         cli_credentials_set_username(credentials, uname, obtained);
 896 }
 897
 898 /**
 899  * Given a a credentials structure, print it as a string
 900  *
 901  * The format output is [domain\\]user[%password] or user[@realm][%password]
 902  *
 903  * @param credentials Credentials structure on which to set the password
 904  * @param mem_ctx The memory context to place the result on
 905  */
 906
 907 _PUBLIC_ char *cli_credentials_get_unparsed_name(struct cli_credentials *credentials, TALLOC_CTX *mem_ctx)
 908 {
 909         const char *bind_dn = cli_credentials_get_bind_dn(credentials);
 910         const char *domain = NULL;
 911         const char *username = NULL;
 912         char *name = NULL;
 913
 914         if (bind_dn) {
 915                 name = talloc_strdup(mem_ctx, bind_dn);
 916         } else {
 917                 cli_credentials_get_ntlm_username_domain(credentials, mem_ctx, &username, &domain);
 918                 if (domain && domain[0]) {
 919                         name = talloc_asprintf(mem_ctx, "%s\\%s",
 920                                                domain, username);
 921                 } else {
 922                         name = talloc_asprintf(mem_ctx, "%s",
 923                                                username);
 924                 }
 925         }
 926         return name;
 927 }
 928
 929 /**
 930  * Specifies default values for domain, workstation and realm
 931  * from the smb.conf configuration file
 932  *
 933  * @param cred Credentials structure to fill in
 934  */
 935 _PUBLIC_ void cli_credentials_set_conf(struct cli_credentials *cred,
 936                               struct loadparm_context *lp_ctx)
 937 {
 938         const char *sep = NULL;
 939         const char *realm = lpcfg_realm(lp_ctx);
 940
 941         cli_credentials_set_username(cred, "", CRED_UNINITIALISED);
 942         if (lpcfg_parm_is_cmdline(lp_ctx, "workgroup")) {
 943                 cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_SPECIFIED);
 944         } else {
 945                 cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_UNINITIALISED);
 946         }
 947         if (lpcfg_parm_is_cmdline(lp_ctx, "netbios name")) {
 948                 cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_SPECIFIED);
 949         } else {
 950                 cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_UNINITIALISED);
 951         }
 952         if (realm != NULL && strlen(realm) == 0) {
 953                 realm = NULL;
 954         }
 955         if (lpcfg_parm_is_cmdline(lp_ctx, "realm")) {
 956                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
 957         } else {
 958                 cli_credentials_set_realm(cred, realm, CRED_UNINITIALISED);
 959         }
 960
 961         sep = lpcfg_winbind_separator(lp_ctx);
 962         if (sep != NULL && sep[0] != '\0') {
 963                 cred->winbind_separator = *lpcfg_winbind_separator(lp_ctx);
 964         }
 965 }
 966
 967 /**
 968  * Guess defaults for credentials from environment variables,
 969  * and from the configuration file
 970  *
 971  * @param cred Credentials structure to fill in
 972  */
 973 _PUBLIC_ void cli_credentials_guess(struct cli_credentials *cred,
 974                            struct loadparm_context *lp_ctx)
 975 {
 976         char *p;
 977         const char *error_string;
 978
 979         if (lp_ctx != NULL) {
 980                 cli_credentials_set_conf(cred, lp_ctx);
 981         }
 982
 983         if (getenv("LOGNAME")) {
 984                 cli_credentials_set_username(cred, getenv("LOGNAME"), CRED_GUESS_ENV);
 985         }
 986
 987         if (getenv("USER")) {
 988                 cli_credentials_parse_string(cred, getenv("USER"), CRED_GUESS_ENV);
 989                 if ((p = strchr_m(getenv("USER"),'%'))) {
 990                         memset(p,0,strlen(cred->password));
 991                 }
 992         }
 993
 994         if (getenv("PASSWD")) {
 995                 cli_credentials_set_password(cred, getenv("PASSWD"), CRED_GUESS_ENV);
 996         }
 997
 998         if (getenv("PASSWD_FD")) {
 999                 cli_credentials_parse_password_fd(cred, atoi(getenv("PASSWD_FD")),
1000                                                   CRED_GUESS_FILE);
1001         }
1002
1003         p = getenv("PASSWD_FILE");
1004         if (p && p[0]) {
1005                 cli_credentials_parse_password_file(cred, p, CRED_GUESS_FILE);
1006         }
1007
1008         if (cli_credentials_get_kerberos_state(cred) != CRED_DONT_USE_KERBEROS) {
1009                 cli_credentials_set_ccache(cred, lp_ctx, NULL, CRED_GUESS_FILE,
1010                                            &error_string);
1011         }
1012 }
1013
1014 /**
1015  * Attach NETLOGON credentials for use with SCHANNEL
1016  */
1017
1018 _PUBLIC_ void cli_credentials_set_netlogon_creds(
1019         struct cli_credentials *cred,
1020         const struct netlogon_creds_CredentialState *netlogon_creds)
1021 {
1022         TALLOC_FREE(cred->netlogon_creds);
1023         if (netlogon_creds == NULL) {
1024                 return;
1025         }
1026         cred->netlogon_creds = netlogon_creds_copy(cred, netlogon_creds);
1027 }
1028
1029 /**
1030  * Return attached NETLOGON credentials
1031  */
1032
1033 _PUBLIC_ struct netlogon_creds_CredentialState *cli_credentials_get_netlogon_creds(struct cli_credentials *cred)
1034 {
1035         return cred->netlogon_creds;
1036 }
1037
1038 /**
1039  * Set NETLOGON secure channel type
1040  */
1041
1042 _PUBLIC_ void cli_credentials_set_secure_channel_type(struct cli_credentials *cred,
1043                                              enum netr_SchannelType secure_channel_type)
1044 {
1045         cred->secure_channel_type = secure_channel_type;
1046 }
1047
1048 /**
1049  * Return NETLOGON secure chanel type
1050  */
1051
1052 _PUBLIC_ time_t cli_credentials_get_password_last_changed_time(struct cli_credentials *cred)
1053 {
1054         return cred->password_last_changed_time;
1055 }
1056
1057 /**
1058  * Set NETLOGON secure channel type
1059  */
1060
1061 _PUBLIC_ void cli_credentials_set_password_last_changed_time(struct cli_credentials *cred,
1062                                                              time_t last_changed_time)
1063 {
1064         cred->password_last_changed_time = last_changed_time;
1065 }
1066
1067 /**
1068  * Return NETLOGON secure chanel type
1069  */
1070
1071 _PUBLIC_ enum netr_SchannelType cli_credentials_get_secure_channel_type(struct cli_credentials *cred)
1072 {
1073         return cred->secure_channel_type;
1074 }
1075
1076 /**
1077  * Fill in a credentials structure as the anonymous user
1078  */
1079 _PUBLIC_ void cli_credentials_set_anonymous(struct cli_credentials *cred)
1080 {
1081         cli_credentials_set_username(cred, "", CRED_SPECIFIED);
1082         cli_credentials_set_domain(cred, "", CRED_SPECIFIED);
1083         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
1084         cli_credentials_set_principal(cred, NULL, CRED_SPECIFIED);
1085         cli_credentials_set_realm(cred, NULL, CRED_SPECIFIED);
1086         cli_credentials_set_workstation(cred, "", CRED_UNINITIALISED);
1087         cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
1088 }
1089
1090 /**
1091  * Describe a credentials context as anonymous or authenticated
1092  * @retval true if anonymous, false if a username is specified
1093  */
1094
1095 _PUBLIC_ bool cli_credentials_is_anonymous(struct cli_credentials *cred)
1096 {
1097         const char *username;
1098
1099         /* if bind dn is set it's not anonymous */
1100         if (cred->bind_dn) {
1101                 return false;
1102         }
1103
1104         if (cred->machine_account_pending) {
1105                 cli_credentials_set_machine_account(cred,
1106                                                     cred->machine_account_pending_lp_ctx);
1107         }
1108
1109         /* if principal is set, it's not anonymous */
1110         if ((cred->principal != NULL) && cred->principal_obtained >= cred->username_obtained) {
1111                 return false;
1112         }
1113
1114         username = cli_credentials_get_username(cred);
1115
1116         /* Yes, it is deliberate that we die if we have a NULL pointer
1117          * here - anonymous is "", not NULL, which is 'never specified,
1118          * never guessed', ie programmer bug */
1119         if (!username[0]) {
1120                 return true;
1121         }
1122
1123         return false;
1124 }
1125
1126 /**
1127  * Mark the current password for a credentials struct as wrong. This will
1128  * cause the password to be prompted again (if a callback is set).
1129  *
1130  * This will decrement the number of times the password can be tried.
1131  *
1132  * @retval whether the credentials struct is finished
1133  */
1134 _PUBLIC_ bool cli_credentials_wrong_password(struct cli_credentials *cred)
1135 {
1136         if (cred->password_obtained != CRED_CALLBACK_RESULT) {
1137                 return false;
1138         }
1139
1140         if (cred->password_tries == 0) {
1141                 return false;
1142         }
1143
1144         cred->password_tries--;
1145
1146         if (cred->password_tries == 0) {
1147                 return false;
1148         }
1149
1150         cred->password_obtained = CRED_CALLBACK;
1151         return true;
1152 }
1153
1154 _PUBLIC_ void cli_credentials_get_ntlm_username_domain(struct cli_credentials *cred, TALLOC_CTX *mem_ctx,
1155                                               const char **username,
1156                                               const char **domain)
1157 {
1158         if (cred->principal_obtained > cred->username_obtained) {
1159                 *domain = talloc_strdup(mem_ctx, "");
1160                 *username = cli_credentials_get_principal(cred, mem_ctx);
1161         } else {
1162                 *domain = cli_credentials_get_domain(cred);
1163                 *username = cli_credentials_get_username(cred);
1164         }
1165 }
1166
1167 /**
1168  * Read a named file, and parse it for username, domain, realm and password
1169  *
1170  * @param credentials Credentials structure on which to set the password
1171  * @param file a named file to read the details from
1172  * @param obtained This enum describes how 'specified' this password is
1173  */
1174
1175 _PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
1176 {
1177         uint16_t len = 0;
1178         char *ptr, *val, *param;
1179         char **lines;
1180         int i, numlines;
1181         const char *realm = NULL;
1182         const char *domain = NULL;
1183         const char *password = NULL;
1184         const char *username = NULL;
1185
1186         lines = file_lines_load(file, &numlines, 0, NULL);
1187
1188         if (lines == NULL)
1189         {
1190                 /* fail if we can't open the credentials file */
1191                 d_printf("ERROR: Unable to open credentials file!\n");
1192                 return false;
1193         }
1194
1195         for (i = 0; i < numlines; i++) {
1196                 len = strlen(lines[i]);
1197
1198                 if (len == 0)
1199                         continue;
1200
1201                 /* break up the line into parameter & value.
1202                  * will need to eat a little whitespace possibly */
1203                 param = lines[i];
1204                 if (!(ptr = strchr_m (lines[i], '=')))
1205                         continue;
1206
1207                 val = ptr+1;
1208                 *ptr = '\0';
1209
1210                 /* eat leading white space */
1211                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
1212                         val++;
1213
1214                 if (strwicmp("password", param) == 0) {
1215                         password = val;
1216                 } else if (strwicmp("username", param) == 0) {
1217                         username = val;
1218                 } else if (strwicmp("domain", param) == 0) {
1219                         domain = val;
1220                 } else if (strwicmp("realm", param) == 0) {
1221                         realm = val;
1222                 }
1223
1224                 /*
1225                  * We need to readd '=' in order to let
1226                  * the strlen() work in the last loop
1227                  * that clears the memory.
1228                  */
1229                 *ptr = '=';
1230         }
1231
1232         if (realm != NULL && strlen(realm) != 0) {
1233                 /*
1234                  * only overwrite with a valid string
1235                  */
1236                 cli_credentials_set_realm(cred, realm, obtained);
1237         }
1238
1239         if (domain != NULL && strlen(domain) != 0) {
1240                 /*
1241                  * only overwrite with a valid string
1242                  */
1243                 cli_credentials_set_domain(cred, domain, obtained);
1244         }
1245
1246         if (password != NULL) {
1247                 /*
1248                  * Here we allow "".
1249                  */
1250                 cli_credentials_set_password(cred, password, obtained);
1251         }
1252
1253         if (username != NULL) {
1254                 /*
1255                  * The last "username" line takes preference
1256                  * if the string also contains domain, realm or
1257                  * password.
1258                  */
1259                 cli_credentials_parse_string(cred, username, obtained);
1260         }
1261
1262         for (i = 0; i < numlines; i++) {
1263                 len = strlen(lines[i]);
1264                 memset(lines[i], 0, len);
1265         }
1266         talloc_free(lines);
1267
1268         return true;
1269 }
1270
1271 /**
1272  * Read a named file, and parse it for a password
1273  *
1274  * @param credentials Credentials structure on which to set the password
1275  * @param file a named file to read the password from
1276  * @param obtained This enum describes how 'specified' this password is
1277  */
1278
1279 _PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
1280 {
1281         int fd = open(file, O_RDONLY, 0);
1282         bool ret;
1283
1284         if (fd < 0) {
1285                 fprintf(stderr, "Error opening password file %s: %s\n",
1286                                 file, strerror(errno));
1287                 return false;
1288         }
1289
1290         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
1291
1292         close(fd);
1293
1294         return ret;
1295 }
1296
1297
1298 /**
1299  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
1300  *
1301  * @param credentials Credentials structure on which to set the password
1302  * @param fd open file descriptor to read the password from
1303  * @param obtained This enum describes how 'specified' this password is
1304  */
1305
1306 _PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials,
1307                                        int fd, enum credentials_obtained obtained)
1308 {
1309         char *p;
1310         char pass[128];
1311
1312         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
1313                 p && p - pass < sizeof(pass);) {
1314                 switch (read(fd, p, 1)) {
1315                 case 1:
1316                         if (*p != '\n' && *p != '\0') {
1317                                 *++p = '\0'; /* advance p, and null-terminate pass */
1318                                 break;
1319                         }
1320
1321                         FALL_THROUGH;
1322                 case 0:
1323                         if (p - pass) {
1324                                 *p = '\0'; /* null-terminate it, just in case... */
1325                                 p = NULL; /* then force the loop condition to become false */
1326                                 break;
1327                         }
1328
1329                         fprintf(stderr,
1330                                 "Error reading password from file descriptor "
1331                                 "%d: empty password\n",
1332                                 fd);
1333                         return false;
1334
1335                 default:
1336                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
1337                                         fd, strerror(errno));
1338                         return false;
1339                 }
1340         }
1341
1342         cli_credentials_set_password(credentials, pass, obtained);
1343         return true;
1344 }
1345
1346
1347 /**
1348  * Encrypt a data blob using the session key and the negotiated encryption
1349  * algorithm
1350  *
1351  * @param state Credential state, contains the session key and algorithm
1352  * @param data Data blob containing the data to be encrypted.
1353  *
1354  */
1355 _PUBLIC_ NTSTATUS netlogon_creds_session_encrypt(
1356         struct netlogon_creds_CredentialState *state,
1357         DATA_BLOB data)
1358 {
1359         if (data.data == NULL || data.length == 0) {
1360                 DBG_ERR("Nothing to encrypt "
1361                         "data.data == NULL or data.length == 0");
1362                 return NT_STATUS_INVALID_PARAMETER;
1363         }
1364         /*
1365          * Don't crypt an all-zero password it will give away the
1366          * NETLOGON pipe session key .
1367          */
1368         if (all_zero(data.data, data.length)) {
1369                 DBG_ERR("Supplied data all zeros, could leak session key");
1370                 return NT_STATUS_INVALID_PARAMETER;
1371         }
1372         if (state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
1373                 netlogon_creds_aes_encrypt(state,
1374                                            data.data,
1375                                            data.length);
1376         } else if (state->negotiate_flags & NETLOGON_NEG_ARCFOUR) {
1377                 netlogon_creds_arcfour_crypt(state,
1378                                              data.data,
1379                                              data.length);
1380         } else {
1381                 DBG_ERR("Unsupported encryption option negotiated");
1382                 return NT_STATUS_NOT_SUPPORTED;
1383         }
1384         return NT_STATUS_OK;
1385 }
1386