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 "libcli/auth/libcli_auth.h"
  29 #include "tevent.h"
  30 #include "param/param.h"
  31 #include "system/filesys.h"
  32
  33 /**
  34  * Create a new credentials structure
  35  * @param mem_ctx TALLOC_CTX parent for credentials structure
  36  */
  37 _PUBLIC_ struct cli_credentials *cli_credentials_init(TALLOC_CTX *mem_ctx)
  38 {
  39         struct cli_credentials *cred = talloc(mem_ctx, struct cli_credentials);
  40         if (cred == NULL) {
  41                 return cred;
  42         }
  43
  44         cred->workstation_obtained = CRED_UNINITIALISED;
  45         cred->username_obtained = CRED_UNINITIALISED;
  46         cred->password_obtained = CRED_UNINITIALISED;
  47         cred->domain_obtained = CRED_UNINITIALISED;
  48         cred->realm_obtained = CRED_UNINITIALISED;
  49         cred->ccache_obtained = CRED_UNINITIALISED;
  50         cred->client_gss_creds_obtained = CRED_UNINITIALISED;
  51         cred->principal_obtained = CRED_UNINITIALISED;
  52         cred->keytab_obtained = CRED_UNINITIALISED;
  53         cred->server_gss_creds_obtained = CRED_UNINITIALISED;
  54
  55         cred->ccache_threshold = CRED_UNINITIALISED;
  56         cred->client_gss_creds_threshold = CRED_UNINITIALISED;
  57
  58         cred->workstation = NULL;
  59         cred->username = NULL;
  60         cred->password = NULL;
  61         cred->old_password = NULL;
  62         cred->domain = NULL;
  63         cred->realm = NULL;
  64         cred->principal = NULL;
  65         cred->salt_principal = NULL;
  66         cred->impersonate_principal = NULL;
  67         cred->self_service = NULL;
  68         cred->target_service = NULL;
  69
  70         cred->bind_dn = NULL;
  71
  72         cred->nt_hash = NULL;
  73
  74         cred->lm_response.data = NULL;
  75         cred->lm_response.length = 0;
  76         cred->nt_response.data = NULL;
  77         cred->nt_response.length = 0;
  78
  79         cred->ccache = NULL;
  80         cred->client_gss_creds = NULL;
  81         cred->keytab = NULL;
  82         cred->server_gss_creds = NULL;
  83
  84         cred->workstation_cb = NULL;
  85         cred->password_cb = NULL;
  86         cred->username_cb = NULL;
  87         cred->domain_cb = NULL;
  88         cred->realm_cb = NULL;
  89         cred->principal_cb = NULL;
  90
  91         cred->priv_data = NULL;
  92
  93         cred->netlogon_creds = NULL;
  94         cred->secure_channel_type = SEC_CHAN_NULL;
  95
  96         cred->kvno = 0;
  97
  98         cred->password_last_changed_time = 0;
  99
 100         cred->smb_krb5_context = NULL;
 101
 102         cred->machine_account_pending = false;
 103         cred->machine_account_pending_lp_ctx = NULL;
 104
 105         cred->machine_account = false;
 106
 107         cred->password_tries = 0;
 108
 109         cred->callback_running = false;
 110
 111         cli_credentials_set_kerberos_state(cred, CRED_AUTO_USE_KERBEROS);
 112         cli_credentials_set_gensec_features(cred, 0);
 113         cli_credentials_set_krb_forwardable(cred, CRED_AUTO_KRB_FORWARDABLE);
 114
 115         cred->forced_sasl_mech = NULL;
 116
 117         return cred;
 118 }
 119
 120 _PUBLIC_ void cli_credentials_set_callback_data(struct cli_credentials *cred,
 121                                                 void *callback_data)
 122 {
 123         cred->priv_data = callback_data;
 124 }
 125
 126 _PUBLIC_ void *_cli_credentials_callback_data(struct cli_credentials *cred)
 127 {
 128         return cred->priv_data;
 129 }
 130
 131 _PUBLIC_ struct cli_credentials *cli_credentials_shallow_copy(TALLOC_CTX *mem_ctx,
 132                                                 struct cli_credentials *src)
 133 {
 134         struct cli_credentials *dst;
 135
 136         dst = talloc(mem_ctx, struct cli_credentials);
 137         if (dst == NULL) {
 138                 return NULL;
 139         }
 140
 141         *dst = *src;
 142
 143         return dst;
 144 }
 145
 146 /**
 147  * Create a new anonymous credential
 148  * @param mem_ctx TALLOC_CTX parent for credentials structure
 149  */
 150 _PUBLIC_ struct cli_credentials *cli_credentials_init_anon(TALLOC_CTX *mem_ctx)
 151 {
 152         struct cli_credentials *anon_credentials;
 153
 154         anon_credentials = cli_credentials_init(mem_ctx);
 155         cli_credentials_set_anonymous(anon_credentials);
 156
 157         return anon_credentials;
 158 }
 159
 160 _PUBLIC_ void cli_credentials_set_kerberos_state(struct cli_credentials *creds,
 161                                         enum credentials_use_kerberos use_kerberos)
 162 {
 163         creds->use_kerberos = use_kerberos;
 164 }
 165
 166 _PUBLIC_ void cli_credentials_set_forced_sasl_mech(struct cli_credentials *creds,
 167                                                    const char *sasl_mech)
 168 {
 169         TALLOC_FREE(creds->forced_sasl_mech);
 170         creds->forced_sasl_mech = talloc_strdup(creds, sasl_mech);
 171 }
 172
 173 _PUBLIC_ void cli_credentials_set_krb_forwardable(struct cli_credentials *creds,
 174                                                   enum credentials_krb_forwardable krb_forwardable)
 175 {
 176         creds->krb_forwardable = krb_forwardable;
 177 }
 178
 179 _PUBLIC_ enum credentials_use_kerberos cli_credentials_get_kerberos_state(struct cli_credentials *creds)
 180 {
 181         return creds->use_kerberos;
 182 }
 183
 184 _PUBLIC_ const char *cli_credentials_get_forced_sasl_mech(struct cli_credentials *creds)
 185 {
 186         return creds->forced_sasl_mech;
 187 }
 188
 189 _PUBLIC_ enum credentials_krb_forwardable cli_credentials_get_krb_forwardable(struct cli_credentials *creds)
 190 {
 191         return creds->krb_forwardable;
 192 }
 193
 194 _PUBLIC_ void cli_credentials_set_gensec_features(struct cli_credentials *creds, uint32_t gensec_features)
 195 {
 196         creds->gensec_features = gensec_features;
 197 }
 198
 199 _PUBLIC_ uint32_t cli_credentials_get_gensec_features(struct cli_credentials *creds)
 200 {
 201         return creds->gensec_features;
 202 }
 203
 204
 205 /**
 206  * Obtain the username for this credentials context.
 207  * @param cred credentials context
 208  * @retval The username set on this context.
 209  * @note Return value will never be NULL except by programmer error.
 210  */
 211 _PUBLIC_ const char *cli_credentials_get_username(struct cli_credentials *cred)
 212 {
 213         if (cred->machine_account_pending) {
 214                 cli_credentials_set_machine_account(cred,
 215                                         cred->machine_account_pending_lp_ctx);
 216         }
 217
 218         if (cred->username_obtained == CRED_CALLBACK &&
 219             !cred->callback_running) {
 220                 cred->callback_running = true;
 221                 cred->username = cred->username_cb(cred);
 222                 cred->callback_running = false;
 223                 if (cred->username_obtained == CRED_CALLBACK) {
 224                         cred->username_obtained = CRED_CALLBACK_RESULT;
 225                         cli_credentials_invalidate_ccache(cred, cred->username_obtained);
 226                 }
 227         }
 228
 229         return cred->username;
 230 }
 231
 232 _PUBLIC_ bool cli_credentials_set_username(struct cli_credentials *cred,
 233                                   const char *val, enum credentials_obtained obtained)
 234 {
 235         if (obtained >= cred->username_obtained) {
 236                 cred->username = talloc_strdup(cred, val);
 237                 cred->username_obtained = obtained;
 238                 cli_credentials_invalidate_ccache(cred, cred->username_obtained);
 239                 return true;
 240         }
 241
 242         return false;
 243 }
 244
 245 _PUBLIC_ bool cli_credentials_set_username_callback(struct cli_credentials *cred,
 246                                   const char *(*username_cb) (struct cli_credentials *))
 247 {
 248         if (cred->username_obtained < CRED_CALLBACK) {
 249                 cred->username_cb = username_cb;
 250                 cred->username_obtained = CRED_CALLBACK;
 251                 return true;
 252         }
 253
 254         return false;
 255 }
 256
 257 _PUBLIC_ bool cli_credentials_set_bind_dn(struct cli_credentials *cred,
 258                                  const char *bind_dn)
 259 {
 260         cred->bind_dn = talloc_strdup(cred, bind_dn);
 261         return true;
 262 }
 263
 264 /**
 265  * Obtain the BIND DN for this credentials context.
 266  * @param cred credentials context
 267  * @retval The username set on this context.
 268  * @note Return value will be NULL if not specified explictly
 269  */
 270 _PUBLIC_ const char *cli_credentials_get_bind_dn(struct cli_credentials *cred)
 271 {
 272         return cred->bind_dn;
 273 }
 274
 275
 276 /**
 277  * Obtain the client principal for this credentials context.
 278  * @param cred credentials context
 279  * @retval The username set on this context.
 280  * @note Return value will never be NULL except by programmer error.
 281  */
 282 _PUBLIC_ const char *cli_credentials_get_principal_and_obtained(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, enum credentials_obtained *obtained)
 283 {
 284         if (cred->machine_account_pending) {
 285                 cli_credentials_set_machine_account(cred,
 286                                         cred->machine_account_pending_lp_ctx);
 287         }
 288
 289         if (cred->principal_obtained == CRED_CALLBACK &&
 290             !cred->callback_running) {
 291                 cred->callback_running = true;
 292                 cred->principal = cred->principal_cb(cred);
 293                 cred->callback_running = false;
 294                 if (cred->principal_obtained == CRED_CALLBACK) {
 295                         cred->principal_obtained = CRED_CALLBACK_RESULT;
 296                         cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
 297                 }
 298         }
 299
 300         if (cred->principal_obtained < cred->username_obtained
 301             || cred->principal_obtained < MAX(cred->domain_obtained, cred->realm_obtained)) {
 302                 if (cred->domain_obtained > cred->realm_obtained) {
 303                         *obtained = MIN(cred->domain_obtained, cred->username_obtained);
 304                         return talloc_asprintf(mem_ctx, "%s@%s",
 305                                                cli_credentials_get_username(cred),
 306                                                cli_credentials_get_domain(cred));
 307                 } else {
 308                         *obtained = MIN(cred->domain_obtained, cred->username_obtained);
 309                         return talloc_asprintf(mem_ctx, "%s@%s",
 310                                                cli_credentials_get_username(cred),
 311                                                cli_credentials_get_realm(cred));
 312                 }
 313         }
 314         *obtained = cred->principal_obtained;
 315         return talloc_strdup(mem_ctx, cred->principal);
 316 }
 317
 318 /**
 319  * Obtain the client principal for this credentials context.
 320  * @param cred credentials context
 321  * @retval The username set on this context.
 322  * @note Return value will never be NULL except by programmer error.
 323  */
 324 _PUBLIC_ const char *cli_credentials_get_principal(struct cli_credentials *cred, TALLOC_CTX *mem_ctx)
 325 {
 326         enum credentials_obtained obtained;
 327         return cli_credentials_get_principal_and_obtained(cred, mem_ctx, &obtained);
 328 }
 329
 330 _PUBLIC_ bool cli_credentials_set_principal(struct cli_credentials *cred,
 331                                    const char *val,
 332                                    enum credentials_obtained obtained)
 333 {
 334         if (obtained >= cred->principal_obtained) {
 335                 cred->principal = talloc_strdup(cred, val);
 336                 cred->principal_obtained = obtained;
 337                 cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
 338                 return true;
 339         }
 340
 341         return false;
 342 }
 343
 344 /* Set a callback to get the principal.  This could be a popup dialog,
 345  * a terminal prompt or similar.  */
 346 _PUBLIC_ bool cli_credentials_set_principal_callback(struct cli_credentials *cred,
 347                                   const char *(*principal_cb) (struct cli_credentials *))
 348 {
 349         if (cred->principal_obtained < CRED_CALLBACK) {
 350                 cred->principal_cb = principal_cb;
 351                 cred->principal_obtained = CRED_CALLBACK;
 352                 return true;
 353         }
 354
 355         return false;
 356 }
 357
 358 /* Some of our tools are 'anonymous by default'.  This is a single
 359  * function to determine if authentication has been explicitly
 360  * requested */
 361
 362 _PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *cred)
 363 {
 364         if (cred->bind_dn) {
 365                 return true;
 366         }
 367
 368         /*
 369          * If we forced the mech we clearly want authentication. E.g. to use
 370          * SASL/EXTERNAL which has no credentials.
 371          */
 372         if (cred->forced_sasl_mech) {
 373                 return true;
 374         }
 375
 376         if (cli_credentials_is_anonymous(cred)){
 377                 return false;
 378         }
 379
 380         if (cred->principal_obtained >= CRED_SPECIFIED) {
 381                 return true;
 382         }
 383         if (cred->username_obtained >= CRED_SPECIFIED) {
 384                 return true;
 385         }
 386
 387         if (cli_credentials_get_kerberos_state(cred) == CRED_MUST_USE_KERBEROS) {
 388                 return true;
 389         }
 390
 391         return false;
 392 }
 393
 394 /**
 395  * Obtain the password for this credentials context.
 396  * @param cred credentials context
 397  * @retval If set, the cleartext password, otherwise NULL
 398  */
 399 _PUBLIC_ const char *cli_credentials_get_password(struct cli_credentials *cred)
 400 {
 401         if (cred->machine_account_pending) {
 402                 cli_credentials_set_machine_account(cred,
 403                                                     cred->machine_account_pending_lp_ctx);
 404         }
 405
 406         if (cred->password_obtained == CRED_CALLBACK &&
 407             !cred->callback_running) {
 408                 cred->callback_running = true;
 409                 cred->password = cred->password_cb(cred);
 410                 cred->callback_running = false;
 411                 if (cred->password_obtained == CRED_CALLBACK) {
 412                         cred->password_obtained = CRED_CALLBACK_RESULT;
 413                         cli_credentials_invalidate_ccache(cred, cred->password_obtained);
 414                 }
 415         }
 416
 417         return cred->password;
 418 }
 419
 420 /* Set a password on the credentials context, including an indication
 421  * of 'how' the password was obtained */
 422
 423 _PUBLIC_ bool cli_credentials_set_password(struct cli_credentials *cred,
 424                                   const char *val,
 425                                   enum credentials_obtained obtained)
 426 {
 427         if (obtained >= cred->password_obtained) {
 428                 cred->password_tries = 0;
 429                 cred->password = talloc_strdup(cred, val);
 430                 if (cred->password) {
 431                         /* Don't print the actual password in talloc memory dumps */
 432                         talloc_set_name_const(cred->password, "password set via cli_credentials_set_password");
 433                 }
 434                 cred->password_obtained = obtained;
 435                 cli_credentials_invalidate_ccache(cred, cred->password_obtained);
 436
 437                 cred->nt_hash = NULL;
 438                 cred->lm_response = data_blob(NULL, 0);
 439                 cred->nt_response = data_blob(NULL, 0);
 440                 return true;
 441         }
 442
 443         return false;
 444 }
 445
 446 _PUBLIC_ bool cli_credentials_set_password_callback(struct cli_credentials *cred,
 447                                            const char *(*password_cb) (struct cli_credentials *))
 448 {
 449         if (cred->password_obtained < CRED_CALLBACK) {
 450                 cred->password_tries = 3;
 451                 cred->password_cb = password_cb;
 452                 cred->password_obtained = CRED_CALLBACK;
 453                 cli_credentials_invalidate_ccache(cred, cred->password_obtained);
 454                 return true;
 455         }
 456
 457         return false;
 458 }
 459
 460 /**
 461  * Obtain the 'old' password for this credentials context (used for join accounts).
 462  * @param cred credentials context
 463  * @retval If set, the cleartext password, otherwise NULL
 464  */
 465 _PUBLIC_ const char *cli_credentials_get_old_password(struct cli_credentials *cred)
 466 {
 467         if (cred->machine_account_pending) {
 468                 cli_credentials_set_machine_account(cred,
 469                                                     cred->machine_account_pending_lp_ctx);
 470         }
 471
 472         return cred->old_password;
 473 }
 474
 475 _PUBLIC_ bool cli_credentials_set_old_password(struct cli_credentials *cred,
 476                                       const char *val,
 477                                       enum credentials_obtained obtained)
 478 {
 479         cred->old_password = talloc_strdup(cred, val);
 480         if (cred->old_password) {
 481                 /* Don't print the actual password in talloc memory dumps */
 482                 talloc_set_name_const(cred->old_password, "password set via cli_credentials_set_old_password");
 483         }
 484         return true;
 485 }
 486
 487 /**
 488  * Obtain the password, in the form MD4(unicode(password)) for this credentials context.
 489  *
 490  * Sometimes we only have this much of the password, while the rest of
 491  * the time this call avoids calling E_md4hash themselves.
 492  *
 493  * @param cred credentials context
 494  * @retval If set, the cleartext password, otherwise NULL
 495  */
 496 _PUBLIC_ struct samr_Password *cli_credentials_get_nt_hash(struct cli_credentials *cred,
 497                                                            TALLOC_CTX *mem_ctx)
 498 {
 499         const char *password = NULL;
 500
 501         if (cred->nt_hash != NULL) {
 502                 struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
 503                 if (!nt_hash) {
 504                         return NULL;
 505                 }
 506
 507                 *nt_hash = *cred->nt_hash;
 508
 509                 return nt_hash;
 510         }
 511
 512         password = cli_credentials_get_password(cred);
 513         if (password) {
 514                 struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
 515                 if (!nt_hash) {
 516                         return NULL;
 517                 }
 518
 519                 E_md4hash(password, nt_hash->hash);
 520
 521                 return nt_hash;
 522         }
 523
 524         return NULL;
 525 }
 526
 527 /**
 528  * Obtain the 'short' or 'NetBIOS' domain for this credentials context.
 529  * @param cred credentials context
 530  * @retval The domain set on this context.
 531  * @note Return value will never be NULL except by programmer error.
 532  */
 533 _PUBLIC_ const char *cli_credentials_get_domain(struct cli_credentials *cred)
 534 {
 535         if (cred->machine_account_pending) {
 536                 cli_credentials_set_machine_account(cred,
 537                                                     cred->machine_account_pending_lp_ctx);
 538         }
 539
 540         if (cred->domain_obtained == CRED_CALLBACK &&
 541             !cred->callback_running) {
 542                 cred->callback_running = true;
 543                 cred->domain = cred->domain_cb(cred);
 544                 cred->callback_running = false;
 545                 if (cred->domain_obtained == CRED_CALLBACK) {
 546                         cred->domain_obtained = CRED_CALLBACK_RESULT;
 547                         cli_credentials_invalidate_ccache(cred, cred->domain_obtained);
 548                 }
 549         }
 550
 551         return cred->domain;
 552 }
 553
 554
 555 _PUBLIC_ bool cli_credentials_set_domain(struct cli_credentials *cred,
 556                                 const char *val,
 557                                 enum credentials_obtained obtained)
 558 {
 559         if (obtained >= cred->domain_obtained) {
 560                 /* it is important that the domain be in upper case,
 561                  * particularly for the sensitive NTLMv2
 562                  * calculations */
 563                 cred->domain = strupper_talloc(cred, val);
 564                 cred->domain_obtained = obtained;
 565                 /* setting domain does not mean we have to invalidate ccache
 566                  * because domain in not used for Kerberos operations.
 567                  * If ccache invalidation is required, one will anyway specify
 568                  * a password to kinit, and that will force invalidation of the ccache
 569                  */
 570                 return true;
 571         }
 572
 573         return false;
 574 }
 575
 576 bool cli_credentials_set_domain_callback(struct cli_credentials *cred,
 577                                          const char *(*domain_cb) (struct cli_credentials *))
 578 {
 579         if (cred->domain_obtained < CRED_CALLBACK) {
 580                 cred->domain_cb = domain_cb;
 581                 cred->domain_obtained = CRED_CALLBACK;
 582                 return true;
 583         }
 584
 585         return false;
 586 }
 587
 588 /**
 589  * Obtain the Kerberos realm for this credentials context.
 590  * @param cred credentials context
 591  * @retval The realm set on this context.
 592  * @note Return value will never be NULL except by programmer error.
 593  */
 594 _PUBLIC_ const char *cli_credentials_get_realm(struct cli_credentials *cred)
 595 {
 596         if (cred->machine_account_pending) {
 597                 cli_credentials_set_machine_account(cred,
 598                                                     cred->machine_account_pending_lp_ctx);
 599         }
 600
 601         if (cred->realm_obtained == CRED_CALLBACK &&
 602             !cred->callback_running) {
 603                 cred->callback_running = true;
 604                 cred->realm = cred->realm_cb(cred);
 605                 cred->callback_running = false;
 606                 if (cred->realm_obtained == CRED_CALLBACK) {
 607                         cred->realm_obtained = CRED_CALLBACK_RESULT;
 608                         cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
 609                 }
 610         }
 611
 612         return cred->realm;
 613 }
 614
 615 /**
 616  * Set the realm for this credentials context, and force it to
 617  * uppercase for the sainity of our local kerberos libraries
 618  */
 619 _PUBLIC_ bool cli_credentials_set_realm(struct cli_credentials *cred,
 620                                const char *val,
 621                                enum credentials_obtained obtained)
 622 {
 623         if (obtained >= cred->realm_obtained) {
 624                 cred->realm = strupper_talloc(cred, val);
 625                 cred->realm_obtained = obtained;
 626                 cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
 627                 return true;
 628         }
 629
 630         return false;
 631 }
 632
 633 bool cli_credentials_set_realm_callback(struct cli_credentials *cred,
 634                                         const char *(*realm_cb) (struct cli_credentials *))
 635 {
 636         if (cred->realm_obtained < CRED_CALLBACK) {
 637                 cred->realm_cb = realm_cb;
 638                 cred->realm_obtained = CRED_CALLBACK;
 639                 return true;
 640         }
 641
 642         return false;
 643 }
 644
 645 /**
 646  * Obtain the 'short' or 'NetBIOS' workstation name for this credentials context.
 647  *
 648  * @param cred credentials context
 649  * @retval The workstation name set on this context.
 650  * @note Return value will never be NULL except by programmer error.
 651  */
 652 _PUBLIC_ const char *cli_credentials_get_workstation(struct cli_credentials *cred)
 653 {
 654         if (cred->workstation_obtained == CRED_CALLBACK &&
 655             !cred->callback_running) {
 656                 cred->callback_running = true;
 657                 cred->workstation = cred->workstation_cb(cred);
 658                 cred->callback_running = false;
 659                 if (cred->workstation_obtained == CRED_CALLBACK) {
 660                         cred->workstation_obtained = CRED_CALLBACK_RESULT;
 661                 }
 662         }
 663
 664         return cred->workstation;
 665 }
 666
 667 _PUBLIC_ bool cli_credentials_set_workstation(struct cli_credentials *cred,
 668                                      const char *val,
 669                                      enum credentials_obtained obtained)
 670 {
 671         if (obtained >= cred->workstation_obtained) {
 672                 cred->workstation = talloc_strdup(cred, val);
 673                 cred->workstation_obtained = obtained;
 674                 return true;
 675         }
 676
 677         return false;
 678 }
 679
 680 bool cli_credentials_set_workstation_callback(struct cli_credentials *cred,
 681                                               const char *(*workstation_cb) (struct cli_credentials *))
 682 {
 683         if (cred->workstation_obtained < CRED_CALLBACK) {
 684                 cred->workstation_cb = workstation_cb;
 685                 cred->workstation_obtained = CRED_CALLBACK;
 686                 return true;
 687         }
 688
 689         return false;
 690 }
 691
 692 /**
 693  * Given a string, typically obtained from a -U argument, parse it into domain, username, realm and password fields
 694  *
 695  * The format accepted is [domain\\]user[%password] or user[@realm][%password]
 696  *
 697  * @param credentials Credentials structure on which to set the password
 698  * @param data the string containing the username, password etc
 699  * @param obtained This enum describes how 'specified' this password is
 700  */
 701
 702 _PUBLIC_ void cli_credentials_parse_string(struct cli_credentials *credentials, const char *data, enum credentials_obtained obtained)
 703 {
 704         char *uname, *p;
 705
 706         if (strcmp("%",data) == 0) {
 707                 cli_credentials_set_anonymous(credentials);
 708                 return;
 709         }
 710
 711         uname = talloc_strdup(credentials, data);
 712         if ((p = strchr_m(uname,'%'))) {
 713                 *p = 0;
 714                 cli_credentials_set_password(credentials, p+1, obtained);
 715         }
 716
 717         if ((p = strchr_m(uname,'@'))) {
 718                 cli_credentials_set_principal(credentials, uname, obtained);
 719                 *p = 0;
 720                 cli_credentials_set_realm(credentials, p+1, obtained);
 721                 return;
 722         } else if ((p = strchr_m(uname,'\\')) || (p = strchr_m(uname, '/'))) {
 723                 *p = 0;
 724                 cli_credentials_set_domain(credentials, uname, obtained);
 725                 uname = p+1;
 726         }
 727         cli_credentials_set_username(credentials, uname, obtained);
 728 }
 729
 730 /**
 731  * Given a a credentials structure, print it as a string
 732  *
 733  * The format output is [domain\\]user[%password] or user[@realm][%password]
 734  *
 735  * @param credentials Credentials structure on which to set the password
 736  * @param mem_ctx The memory context to place the result on
 737  */
 738
 739 _PUBLIC_ const char *cli_credentials_get_unparsed_name(struct cli_credentials *credentials, TALLOC_CTX *mem_ctx)
 740 {
 741         const char *bind_dn = cli_credentials_get_bind_dn(credentials);
 742         const char *domain;
 743         const char *username;
 744         const char *name;
 745
 746         if (bind_dn) {
 747                 name = talloc_strdup(mem_ctx, bind_dn);
 748         } else {
 749                 cli_credentials_get_ntlm_username_domain(credentials, mem_ctx, &username, &domain);
 750                 if (domain && domain[0]) {
 751                         name = talloc_asprintf(mem_ctx, "%s\\%s",
 752                                                domain, username);
 753                 } else {
 754                         name = talloc_asprintf(mem_ctx, "%s",
 755                                                username);
 756                 }
 757         }
 758         return name;
 759 }
 760
 761 /**
 762  * Specifies default values for domain, workstation and realm
 763  * from the smb.conf configuration file
 764  *
 765  * @param cred Credentials structure to fill in
 766  */
 767 _PUBLIC_ void cli_credentials_set_conf(struct cli_credentials *cred,
 768                               struct loadparm_context *lp_ctx)
 769 {
 770         cli_credentials_set_username(cred, "", CRED_UNINITIALISED);
 771         if (lpcfg_parm_is_cmdline(lp_ctx, "workgroup")) {
 772                 cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_SPECIFIED);
 773         } else {
 774                 cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_UNINITIALISED);
 775         }
 776         if (lpcfg_parm_is_cmdline(lp_ctx, "netbios name")) {
 777                 cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_SPECIFIED);
 778         } else {
 779                 cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_UNINITIALISED);
 780         }
 781         if (lpcfg_parm_is_cmdline(lp_ctx, "realm")) {
 782                 cli_credentials_set_realm(cred, lpcfg_realm(lp_ctx), CRED_SPECIFIED);
 783         } else {
 784                 cli_credentials_set_realm(cred, lpcfg_realm(lp_ctx), CRED_UNINITIALISED);
 785         }
 786 }
 787
 788 /**
 789  * Guess defaults for credentials from environment variables,
 790  * and from the configuration file
 791  *
 792  * @param cred Credentials structure to fill in
 793  */
 794 _PUBLIC_ void cli_credentials_guess(struct cli_credentials *cred,
 795                            struct loadparm_context *lp_ctx)
 796 {
 797         char *p;
 798         const char *error_string;
 799
 800         if (lp_ctx != NULL) {
 801                 cli_credentials_set_conf(cred, lp_ctx);
 802         }
 803
 804         if (getenv("LOGNAME")) {
 805                 cli_credentials_set_username(cred, getenv("LOGNAME"), CRED_GUESS_ENV);
 806         }
 807
 808         if (getenv("USER")) {
 809                 cli_credentials_parse_string(cred, getenv("USER"), CRED_GUESS_ENV);
 810                 if ((p = strchr_m(getenv("USER"),'%'))) {
 811                         memset(p,0,strlen(cred->password));
 812                 }
 813         }
 814
 815         if (getenv("PASSWD")) {
 816                 cli_credentials_set_password(cred, getenv("PASSWD"), CRED_GUESS_ENV);
 817         }
 818
 819         if (getenv("PASSWD_FD")) {
 820                 cli_credentials_parse_password_fd(cred, atoi(getenv("PASSWD_FD")),
 821                                                   CRED_GUESS_FILE);
 822         }
 823
 824         p = getenv("PASSWD_FILE");
 825         if (p && p[0]) {
 826                 cli_credentials_parse_password_file(cred, p, CRED_GUESS_FILE);
 827         }
 828
 829         if (cli_credentials_get_kerberos_state(cred) != CRED_DONT_USE_KERBEROS) {
 830                 cli_credentials_set_ccache(cred, lp_ctx, NULL, CRED_GUESS_FILE,
 831                                            &error_string);
 832         }
 833 }
 834
 835 /**
 836  * Attach NETLOGON credentials for use with SCHANNEL
 837  */
 838
 839 _PUBLIC_ void cli_credentials_set_netlogon_creds(struct cli_credentials *cred,
 840                                                  struct netlogon_creds_CredentialState *netlogon_creds)
 841 {
 842         TALLOC_FREE(cred->netlogon_creds);
 843         if (netlogon_creds == NULL) {
 844                 return;
 845         }
 846         cred->netlogon_creds = netlogon_creds_copy(cred, netlogon_creds);
 847 }
 848
 849 /**
 850  * Return attached NETLOGON credentials
 851  */
 852
 853 _PUBLIC_ struct netlogon_creds_CredentialState *cli_credentials_get_netlogon_creds(struct cli_credentials *cred)
 854 {
 855         return cred->netlogon_creds;
 856 }
 857
 858 /**
 859  * Set NETLOGON secure channel type
 860  */
 861
 862 _PUBLIC_ void cli_credentials_set_secure_channel_type(struct cli_credentials *cred,
 863                                              enum netr_SchannelType secure_channel_type)
 864 {
 865         cred->secure_channel_type = secure_channel_type;
 866 }
 867
 868 /**
 869  * Return NETLOGON secure chanel type
 870  */
 871
 872 _PUBLIC_ time_t cli_credentials_get_password_last_changed_time(struct cli_credentials *cred)
 873 {
 874         return cred->password_last_changed_time;
 875 }
 876
 877 /**
 878  * Set NETLOGON secure channel type
 879  */
 880
 881 _PUBLIC_ void cli_credentials_set_password_last_changed_time(struct cli_credentials *cred,
 882                                                              time_t last_changed_time)
 883 {
 884         cred->password_last_changed_time = last_changed_time;
 885 }
 886
 887 /**
 888  * Return NETLOGON secure chanel type
 889  */
 890
 891 _PUBLIC_ enum netr_SchannelType cli_credentials_get_secure_channel_type(struct cli_credentials *cred)
 892 {
 893         return cred->secure_channel_type;
 894 }
 895
 896 /**
 897  * Fill in a credentials structure as the anonymous user
 898  */
 899 _PUBLIC_ void cli_credentials_set_anonymous(struct cli_credentials *cred)
 900 {
 901         cli_credentials_set_username(cred, "", CRED_SPECIFIED);
 902         cli_credentials_set_domain(cred, "", CRED_SPECIFIED);
 903         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
 904         cli_credentials_set_realm(cred, NULL, CRED_SPECIFIED);
 905         cli_credentials_set_workstation(cred, "", CRED_UNINITIALISED);
 906 }
 907
 908 /**
 909  * Describe a credentials context as anonymous or authenticated
 910  * @retval true if anonymous, false if a username is specified
 911  */
 912
 913 _PUBLIC_ bool cli_credentials_is_anonymous(struct cli_credentials *cred)
 914 {
 915         const char *username;
 916
 917         /* if bind dn is set it's not anonymous */
 918         if (cred->bind_dn) {
 919                 return false;
 920         }
 921
 922         if (cred->machine_account_pending) {
 923                 cli_credentials_set_machine_account(cred,
 924                                                     cred->machine_account_pending_lp_ctx);
 925         }
 926
 927         username = cli_credentials_get_username(cred);
 928
 929         /* Yes, it is deliberate that we die if we have a NULL pointer
 930          * here - anonymous is "", not NULL, which is 'never specified,
 931          * never guessed', ie programmer bug */
 932         if (!username[0]) {
 933                 return true;
 934         }
 935
 936         return false;
 937 }
 938
 939 /**
 940  * Mark the current password for a credentials struct as wrong. This will
 941  * cause the password to be prompted again (if a callback is set).
 942  *
 943  * This will decrement the number of times the password can be tried.
 944  *
 945  * @retval whether the credentials struct is finished
 946  */
 947 _PUBLIC_ bool cli_credentials_wrong_password(struct cli_credentials *cred)
 948 {
 949         if (cred->password_obtained != CRED_CALLBACK_RESULT) {
 950                 return false;
 951         }
 952
 953         if (cred->password_tries == 0) {
 954                 return false;
 955         }
 956
 957         cred->password_tries--;
 958
 959         if (cred->password_tries == 0) {
 960                 return false;
 961         }
 962
 963         cred->password_obtained = CRED_CALLBACK;
 964         return true;
 965 }
 966
 967 _PUBLIC_ void cli_credentials_get_ntlm_username_domain(struct cli_credentials *cred, TALLOC_CTX *mem_ctx,
 968                                               const char **username,
 969                                               const char **domain)
 970 {
 971         if (cred->principal_obtained > cred->username_obtained) {
 972                 *domain = talloc_strdup(mem_ctx, "");
 973                 *username = cli_credentials_get_principal(cred, mem_ctx);
 974         } else {
 975                 *domain = cli_credentials_get_domain(cred);
 976                 *username = cli_credentials_get_username(cred);
 977         }
 978 }
 979
 980 /**
 981  * Read a named file, and parse it for username, domain, realm and password
 982  *
 983  * @param credentials Credentials structure on which to set the password
 984  * @param file a named file to read the details from
 985  * @param obtained This enum describes how 'specified' this password is
 986  */
 987
 988 _PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
 989 {
 990         uint16_t len = 0;
 991         char *ptr, *val, *param;
 992         char **lines;
 993         int i, numlines;
 994
 995         lines = file_lines_load(file, &numlines, 0, NULL);
 996
 997         if (lines == NULL)
 998         {
 999                 /* fail if we can't open the credentials file */
1000                 d_printf("ERROR: Unable to open credentials file!\n");
1001                 return false;
1002         }
1003
1004         for (i = 0; i < numlines; i++) {
1005                 len = strlen(lines[i]);
1006
1007                 if (len == 0)
1008                         continue;
1009
1010                 /* break up the line into parameter & value.
1011                  * will need to eat a little whitespace possibly */
1012                 param = lines[i];
1013                 if (!(ptr = strchr_m (lines[i], '=')))
1014                         continue;
1015
1016                 val = ptr+1;
1017                 *ptr = '\0';
1018
1019                 /* eat leading white space */
1020                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
1021                         val++;
1022
1023                 if (strwicmp("password", param) == 0) {
1024                         cli_credentials_set_password(cred, val, obtained);
1025                 } else if (strwicmp("username", param) == 0) {
1026                         cli_credentials_set_username(cred, val, obtained);
1027                 } else if (strwicmp("domain", param) == 0) {
1028                         cli_credentials_set_domain(cred, val, obtained);
1029                 } else if (strwicmp("realm", param) == 0) {
1030                         cli_credentials_set_realm(cred, val, obtained);
1031                 }
1032                 memset(lines[i], 0, len);
1033         }
1034
1035         talloc_free(lines);
1036
1037         return true;
1038 }
1039
1040 /**
1041  * Read a named file, and parse it for a password
1042  *
1043  * @param credentials Credentials structure on which to set the password
1044  * @param file a named file to read the password from
1045  * @param obtained This enum describes how 'specified' this password is
1046  */
1047
1048 _PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
1049 {
1050         int fd = open(file, O_RDONLY, 0);
1051         bool ret;
1052
1053         if (fd < 0) {
1054                 fprintf(stderr, "Error opening password file %s: %s\n",
1055                                 file, strerror(errno));
1056                 return false;
1057         }
1058
1059         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
1060
1061         close(fd);
1062
1063         return ret;
1064 }
1065
1066
1067 /**
1068  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
1069  *
1070  * @param credentials Credentials structure on which to set the password
1071  * @param fd open file descriptor to read the password from
1072  * @param obtained This enum describes how 'specified' this password is
1073  */
1074
1075 _PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials,
1076                                        int fd, enum credentials_obtained obtained)
1077 {
1078         char *p;
1079         char pass[128];
1080
1081         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
1082                 p && p - pass < sizeof(pass);) {
1083                 switch (read(fd, p, 1)) {
1084                 case 1:
1085                         if (*p != '\n' && *p != '\0') {
1086                                 *++p = '\0'; /* advance p, and null-terminate pass */
1087                                 break;
1088                         }
1089                         /* fall through */
1090                 case 0:
1091                         if (p - pass) {
1092                                 *p = '\0'; /* null-terminate it, just in case... */
1093                                 p = NULL; /* then force the loop condition to become false */
1094                                 break;
1095                         } else {
1096                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
1097                                 return false;
1098                         }
1099
1100                 default:
1101                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
1102                                         fd, strerror(errno));
1103                         return false;
1104                 }
1105         }
1106
1107         cli_credentials_set_password(credentials, pass, obtained);
1108         return true;
1109 }
1110
1111