apps/srp.c

   1 /*
   2  * Copyright 2004-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h>
  11 #ifdef OPENSSL_NO_SRP
  12 NON_EMPTY_TRANSLATION_UNIT
  13 #else
  14
  15 # include <stdio.h>
  16 # include <stdlib.h>
  17 # include <string.h>
  18 # include <openssl/conf.h>
  19 # include <openssl/bio.h>
  20 # include <openssl/err.h>
  21 # include <openssl/txt_db.h>
  22 # include <openssl/buffer.h>
  23 # include <openssl/srp.h>
  24 # include "apps.h"
  25
  26 # define BASE_SECTION    "srp"
  27 # define CONFIG_FILE "openssl.cnf"
  28
  29 # define ENV_RANDFILE            "RANDFILE"
  30
  31 # define ENV_DATABASE            "srpvfile"
  32 # define ENV_DEFAULT_SRP         "default_srp"
  33
  34 static int get_index(CA_DB *db, char *id, char type)
  35 {
  36     char **pp;
  37     int i;
  38     if (id == NULL)
  39         return -1;
  40     if (type == DB_SRP_INDEX) {
  41         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
  42             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
  43             if (pp[DB_srptype][0] == DB_SRP_INDEX
  44                 && strcmp(id, pp[DB_srpid]) == 0)
  45                 return i;
  46         }
  47     } else {
  48         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
  49             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
  50
  51             if (pp[DB_srptype][0] != DB_SRP_INDEX
  52                 && strcmp(id, pp[DB_srpid]) == 0)
  53                 return i;
  54         }
  55     }
  56
  57     return -1;
  58 }
  59
  60 static void print_entry(CA_DB *db, int indx, int verbose, char *s)
  61 {
  62     if (indx >= 0 && verbose) {
  63         int j;
  64         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, indx);
  65         BIO_printf(bio_err, "%s \"%s\"\n", s, pp[DB_srpid]);
  66         for (j = 0; j < DB_NUMBER; j++) {
  67             BIO_printf(bio_err, "  %d = \"%s\"\n", j, pp[j]);
  68         }
  69     }
  70 }
  71
  72 static void print_index(CA_DB *db, int indexindex, int verbose)
  73 {
  74     print_entry(db, indexindex, verbose, "g N entry");
  75 }
  76
  77 static void print_user(CA_DB *db, int userindex, int verbose)
  78 {
  79     if (verbose > 0) {
  80         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
  81
  82         if (pp[DB_srptype][0] != 'I') {
  83             print_entry(db, userindex, verbose, "User entry");
  84             print_entry(db, get_index(db, pp[DB_srpgN], 'I'), verbose,
  85                         "g N entry");
  86         }
  87
  88     }
  89 }
  90
  91 static int update_index(CA_DB *db, char **row)
  92 {
  93     char **irow;
  94     int i;
  95
  96     irow = app_malloc(sizeof(*irow) * (DB_NUMBER + 1), "row pointers");
  97     for (i = 0; i < DB_NUMBER; i++)
  98         irow[i] = row[i];
  99     irow[DB_NUMBER] = NULL;
 100
 101     if (!TXT_DB_insert(db->db, irow)) {
 102         BIO_printf(bio_err, "failed to update srpvfile\n");
 103         BIO_printf(bio_err, "TXT_DB error number %ld\n", db->db->error);
 104         OPENSSL_free(irow);
 105         return 0;
 106     }
 107     return 1;
 108 }
 109
 110 static char *lookup_conf(const CONF *conf, const char *section, const char *tag)
 111 {
 112     char *entry = NCONF_get_string(conf, section, tag);
 113     if (entry == NULL)
 114         BIO_printf(bio_err, "variable lookup failed for %s::%s\n", section, tag);
 115     return entry;
 116 }
 117
 118 static char *srp_verify_user(const char *user, const char *srp_verifier,
 119                              char *srp_usersalt, const char *g, const char *N,
 120                              const char *passin, int verbose)
 121 {
 122     char password[1025];
 123     PW_CB_DATA cb_tmp;
 124     char *verifier = NULL;
 125     char *gNid = NULL;
 126     int len;
 127
 128     cb_tmp.prompt_info = user;
 129     cb_tmp.password = passin;
 130
 131     len = password_callback(password, sizeof(password)-1, 0, &cb_tmp);
 132     if (len > 0) {
 133         password[len] = 0;
 134         if (verbose)
 135             BIO_printf(bio_err,
 136                        "Validating\n   user=\"%s\"\n srp_verifier=\"%s\"\n srp_usersalt=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 137                        user, srp_verifier, srp_usersalt, g, N);
 138         if (verbose > 1)
 139             BIO_printf(bio_err, "Pass %s\n", password);
 140
 141         OPENSSL_assert(srp_usersalt != NULL);
 142         if ((gNid = SRP_create_verifier(user, password, &srp_usersalt,
 143                                         &verifier, N, g)) == NULL) {
 144             BIO_printf(bio_err, "Internal error validating SRP verifier\n");
 145         } else {
 146             if (strcmp(verifier, srp_verifier))
 147                 gNid = NULL;
 148             OPENSSL_free(verifier);
 149         }
 150         OPENSSL_cleanse(password, len);
 151     }
 152     return gNid;
 153 }
 154
 155 static char *srp_create_user(char *user, char **srp_verifier,
 156                              char **srp_usersalt, char *g, char *N,
 157                              char *passout, int verbose)
 158 {
 159     char password[1025];
 160     PW_CB_DATA cb_tmp;
 161     char *gNid = NULL;
 162     char *salt = NULL;
 163     int len;
 164     cb_tmp.prompt_info = user;
 165     cb_tmp.password = passout;
 166
 167     len = password_callback(password, sizeof(password)-1, 1, &cb_tmp);
 168     if (len > 0) {
 169         password[len] = 0;
 170         if (verbose)
 171             BIO_printf(bio_err, "Creating\n user=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 172                        user, g, N);
 173         if ((gNid = SRP_create_verifier(user, password, &salt,
 174                                         srp_verifier, N, g)) == NULL) {
 175             BIO_printf(bio_err, "Internal error creating SRP verifier\n");
 176         } else {
 177             *srp_usersalt = salt;
 178         }
 179         OPENSSL_cleanse(password, len);
 180         if (verbose > 1)
 181             BIO_printf(bio_err, "gNid=%s salt =\"%s\"\n verifier =\"%s\"\n",
 182                        gNid, salt, *srp_verifier);
 183
 184     }
 185     return gNid;
 186 }
 187
 188 typedef enum OPTION_choice {
 189     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 190     OPT_VERBOSE, OPT_CONFIG, OPT_NAME, OPT_SRPVFILE, OPT_ADD,
 191     OPT_DELETE, OPT_MODIFY, OPT_LIST, OPT_GN, OPT_USERINFO,
 192     OPT_PASSIN, OPT_PASSOUT, OPT_ENGINE
 193 } OPTION_CHOICE;
 194
 195 const OPTIONS srp_options[] = {
 196     {"help", OPT_HELP, '-', "Display this summary"},
 197     {"verbose", OPT_VERBOSE, '-', "Talk a lot while doing things"},
 198     {"config", OPT_CONFIG, '<', "A config file"},
 199     {"name", OPT_NAME, 's', "The particular srp definition to use"},
 200     {"srpvfile", OPT_SRPVFILE, '<', "The srp verifier file name"},
 201     {"add", OPT_ADD, '-', "Add a user and srp verifier"},
 202     {"modify", OPT_MODIFY, '-',
 203      "Modify the srp verifier of an existing user"},
 204     {"delete", OPT_DELETE, '-', "Delete user from verifier file"},
 205     {"list", OPT_LIST, '-', "List users"},
 206     {"gn", OPT_GN, 's', "Set g and N values to be used for new verifier"},
 207     {"userinfo", OPT_USERINFO, 's', "Additional info to be set for user"},
 208     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 209     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
 210 # ifndef OPENSSL_NO_ENGINE
 211     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 212 # endif
 213     {NULL}
 214 };
 215
 216 int srp_main(int argc, char **argv)
 217 {
 218     ENGINE *e = NULL;
 219     CA_DB *db = NULL;
 220     CONF *conf = NULL;
 221     int gNindex = -1, maxgN = -1, ret = 1, errors = 0, verbose = 0, i;
 222     int doupdatedb = 0, mode = OPT_ERR;
 223     char *user = NULL, *passinarg = NULL, *passoutarg = NULL;
 224     char *passin = NULL, *passout = NULL, *gN = NULL, *userinfo = NULL;
 225     char *randfile = NULL, *section = NULL;
 226     char **gNrow = NULL, *configfile = NULL;
 227     char *srpvfile = NULL, **pp, *prog;
 228     OPTION_CHOICE o;
 229
 230     prog = opt_init(argc, argv, srp_options);
 231     while ((o = opt_next()) != OPT_EOF) {
 232         switch (o) {
 233         case OPT_EOF:
 234         case OPT_ERR:
 235  opthelp:
 236             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 237             goto end;
 238         case OPT_HELP:
 239             opt_help(srp_options);
 240             ret = 0;
 241             goto end;
 242         case OPT_VERBOSE:
 243             verbose++;
 244             break;
 245         case OPT_CONFIG:
 246             configfile = opt_arg();
 247             break;
 248         case OPT_NAME:
 249             section = opt_arg();
 250             break;
 251         case OPT_SRPVFILE:
 252             srpvfile = opt_arg();
 253             break;
 254         case OPT_ADD:
 255         case OPT_DELETE:
 256         case OPT_MODIFY:
 257         case OPT_LIST:
 258             if (mode != OPT_ERR) {
 259                 BIO_printf(bio_err,
 260                            "%s: Only one of -add/-delete/-modify/-list\n",
 261                            prog);
 262                 goto opthelp;
 263             }
 264             mode = o;
 265             break;
 266         case OPT_GN:
 267             gN = opt_arg();
 268             break;
 269         case OPT_USERINFO:
 270             userinfo = opt_arg();
 271             break;
 272         case OPT_PASSIN:
 273             passinarg = opt_arg();
 274             break;
 275         case OPT_PASSOUT:
 276             passoutarg = opt_arg();
 277             break;
 278         case OPT_ENGINE:
 279             e = setup_engine(opt_arg(), 0);
 280             break;
 281         }
 282     }
 283     argc = opt_num_rest();
 284     argv = opt_rest();
 285
 286     if (srpvfile != NULL && configfile != NULL) {
 287         BIO_printf(bio_err,
 288                    "-srpvfile and -configfile cannot be specified together.\n");
 289         goto end;
 290     }
 291     if (mode == OPT_ERR) {
 292         BIO_printf(bio_err,
 293                    "Exactly one of the options -add, -delete, -modify -list must be specified.\n");
 294         goto opthelp;
 295     }
 296     if ((mode == OPT_DELETE || mode == OPT_MODIFY || mode == OPT_ADD)
 297         && argc < 1) {
 298         BIO_printf(bio_err,
 299                    "Need at least one user for options -add, -delete, -modify. \n");
 300         goto opthelp;
 301     }
 302     if ((passinarg != NULL || passoutarg != NULL) && argc != 1) {
 303         BIO_printf(bio_err,
 304                    "-passin, -passout arguments only valid with one user.\n");
 305         goto opthelp;
 306     }
 307
 308     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 309         BIO_printf(bio_err, "Error getting passwords\n");
 310         goto end;
 311     }
 312
 313     if (srpvfile == NULL) {
 314         if (configfile == NULL)
 315             configfile = default_config_file;
 316
 317         if (verbose)
 318             BIO_printf(bio_err, "Using configuration from %s\n",
 319                        configfile);
 320         conf = app_load_config(configfile);
 321         if (conf == NULL)
 322             goto end;
 323         if (configfile != default_config_file && !app_load_modules(conf))
 324             goto end;
 325
 326         /* Lets get the config section we are using */
 327         if (section == NULL) {
 328             if (verbose)
 329                 BIO_printf(bio_err,
 330                            "trying to read " ENV_DEFAULT_SRP
 331                            " in " BASE_SECTION "\n");
 332
 333             section = lookup_conf(conf, BASE_SECTION, ENV_DEFAULT_SRP);
 334             if (section == NULL)
 335                 goto end;
 336         }
 337
 338         if (randfile == NULL)
 339             randfile = NCONF_get_string(conf, BASE_SECTION, "RANDFILE");
 340
 341         if (verbose)
 342             BIO_printf(bio_err,
 343                        "trying to read " ENV_DATABASE " in section \"%s\"\n",
 344                        section);
 345
 346         srpvfile = lookup_conf(conf, section, ENV_DATABASE);
 347         if (srpvfile == NULL)
 348             goto end;
 349     }
 350     if (randfile == NULL)
 351         ERR_clear_error();
 352     else
 353         app_RAND_load_file(randfile, 0);
 354
 355     if (verbose)
 356         BIO_printf(bio_err, "Trying to read SRP verifier file \"%s\"\n",
 357                    srpvfile);
 358
 359     db = load_index(srpvfile, NULL);
 360     if (db == NULL)
 361         goto end;
 362
 363     /* Lets check some fields */
 364     for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 365         pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 366
 367         if (pp[DB_srptype][0] == DB_SRP_INDEX) {
 368             maxgN = i;
 369             if ((gNindex < 0) && (gN != NULL) && strcmp(gN, pp[DB_srpid]) == 0)
 370                 gNindex = i;
 371
 372             print_index(db, i, verbose > 1);
 373         }
 374     }
 375
 376     if (verbose)
 377         BIO_printf(bio_err, "Database initialised\n");
 378
 379     if (gNindex >= 0) {
 380         gNrow = sk_OPENSSL_PSTRING_value(db->db->data, gNindex);
 381         print_entry(db, gNindex, verbose > 1, "Default g and N");
 382     } else if (maxgN > 0 && !SRP_get_default_gN(gN)) {
 383         BIO_printf(bio_err, "No g and N value for index \"%s\"\n", gN);
 384         goto end;
 385     } else {
 386         if (verbose)
 387             BIO_printf(bio_err, "Database has no g N information.\n");
 388         gNrow = NULL;
 389     }
 390
 391     if (verbose > 1)
 392         BIO_printf(bio_err, "Starting user processing\n");
 393
 394     if (argc > 0)
 395         user = *(argv++);
 396
 397     while (mode == OPT_LIST || user) {
 398         int userindex = -1;
 399
 400         if (user != NULL && verbose > 1)
 401             BIO_printf(bio_err, "Processing user \"%s\"\n", user);
 402         if ((userindex = get_index(db, user, 'U')) >= 0)
 403             print_user(db, userindex, (verbose > 0) || mode == OPT_LIST);
 404
 405         if (mode == OPT_LIST) {
 406             if (user == NULL) {
 407                 BIO_printf(bio_err, "List all users\n");
 408
 409                 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++)
 410                     print_user(db, i, 1);
 411             } else if (userindex < 0) {
 412                 BIO_printf(bio_err,
 413                            "user \"%s\" does not exist, ignored. t\n", user);
 414                 errors++;
 415             }
 416         } else if (mode == OPT_ADD) {
 417             if (userindex >= 0) {
 418                 /* reactivation of a new user */
 419                 char **row =
 420                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 421                 BIO_printf(bio_err, "user \"%s\" reactivated.\n", user);
 422                 row[DB_srptype][0] = 'V';
 423
 424                 doupdatedb = 1;
 425             } else {
 426                 char *row[DB_NUMBER];
 427                 char *gNid;
 428                 row[DB_srpverifier] = NULL;
 429                 row[DB_srpsalt] = NULL;
 430                 row[DB_srpinfo] = NULL;
 431                 if (!
 432                     (gNid =
 433                      srp_create_user(user, &(row[DB_srpverifier]),
 434                                      &(row[DB_srpsalt]),
 435                                      gNrow ? gNrow[DB_srpsalt] : gN,
 436                                      gNrow ? gNrow[DB_srpverifier] : NULL,
 437                                      passout, verbose))) {
 438                     BIO_printf(bio_err,
 439                                "Cannot create srp verifier for user \"%s\", operation abandoned .\n",
 440                                user);
 441                     errors++;
 442                     goto end;
 443                 }
 444                 row[DB_srpid] = OPENSSL_strdup(user);
 445                 row[DB_srptype] = OPENSSL_strdup("v");
 446                 row[DB_srpgN] = OPENSSL_strdup(gNid);
 447
 448                 if ((row[DB_srpid] == NULL)
 449                     || (row[DB_srpgN] == NULL)
 450                     || (row[DB_srptype] == NULL)
 451                     || (row[DB_srpverifier] == NULL)
 452                     || (row[DB_srpsalt] == NULL)
 453                     || (userinfo
 454                         && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo)) == NULL))
 455                     || !update_index(db, row)) {
 456                     OPENSSL_free(row[DB_srpid]);
 457                     OPENSSL_free(row[DB_srpgN]);
 458                     OPENSSL_free(row[DB_srpinfo]);
 459                     OPENSSL_free(row[DB_srptype]);
 460                     OPENSSL_free(row[DB_srpverifier]);
 461                     OPENSSL_free(row[DB_srpsalt]);
 462                     goto end;
 463                 }
 464                 doupdatedb = 1;
 465             }
 466         } else if (mode == OPT_MODIFY) {
 467             if (userindex < 0) {
 468                 BIO_printf(bio_err,
 469                            "user \"%s\" does not exist, operation ignored.\n",
 470                            user);
 471                 errors++;
 472             } else {
 473
 474                 char **row =
 475                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 476                 char type = row[DB_srptype][0];
 477                 if (type == 'v') {
 478                     BIO_printf(bio_err,
 479                                "user \"%s\" already updated, operation ignored.\n",
 480                                user);
 481                     errors++;
 482                 } else {
 483                     char *gNid;
 484
 485                     if (row[DB_srptype][0] == 'V') {
 486                         int user_gN;
 487                         char **irow = NULL;
 488                         if (verbose)
 489                             BIO_printf(bio_err,
 490                                        "Verifying password for user \"%s\"\n",
 491                                        user);
 492                         if ((user_gN =
 493                              get_index(db, row[DB_srpgN], DB_SRP_INDEX)) >= 0)
 494                             irow =
 495                                 sk_OPENSSL_PSTRING_value(db->db->data,
 496                                                          userindex);
 497
 498                         if (!srp_verify_user
 499                             (user, row[DB_srpverifier], row[DB_srpsalt],
 500                              irow ? irow[DB_srpsalt] : row[DB_srpgN],
 501                              irow ? irow[DB_srpverifier] : NULL, passin,
 502                              verbose)) {
 503                             BIO_printf(bio_err,
 504                                        "Invalid password for user \"%s\", operation abandoned.\n",
 505                                        user);
 506                             errors++;
 507                             goto end;
 508                         }
 509                     }
 510                     if (verbose)
 511                         BIO_printf(bio_err, "Password for user \"%s\" ok.\n",
 512                                    user);
 513
 514                     if (!
 515                         (gNid =
 516                          srp_create_user(user, &(row[DB_srpverifier]),
 517                                          &(row[DB_srpsalt]),
 518                                          gNrow ? gNrow[DB_srpsalt] : NULL,
 519                                          gNrow ? gNrow[DB_srpverifier] : NULL,
 520                                          passout, verbose))) {
 521                         BIO_printf(bio_err,
 522                                    "Cannot create srp verifier for user \"%s\", operation abandoned.\n",
 523                                    user);
 524                         errors++;
 525                         goto end;
 526                     }
 527
 528                     row[DB_srptype][0] = 'v';
 529                     row[DB_srpgN] = OPENSSL_strdup(gNid);
 530
 531                     if (row[DB_srpid] == NULL
 532                         || row[DB_srpgN] == NULL
 533                         || row[DB_srptype] == NULL
 534                         || row[DB_srpverifier] == NULL
 535                         || row[DB_srpsalt] == NULL
 536                         || (userinfo
 537                             && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo))
 538                                 == NULL)))
 539                         goto end;
 540
 541                     doupdatedb = 1;
 542                 }
 543             }
 544         } else if (mode == OPT_DELETE) {
 545             if (userindex < 0) {
 546                 BIO_printf(bio_err,
 547                            "user \"%s\" does not exist, operation ignored. t\n",
 548                            user);
 549                 errors++;
 550             } else {
 551                 char **xpp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 552
 553                 BIO_printf(bio_err, "user \"%s\" revoked. t\n", user);
 554                 xpp[DB_srptype][0] = 'R';
 555                 doupdatedb = 1;
 556             }
 557         }
 558         if (--argc > 0) {
 559             user = *(argv++);
 560         } else {
 561             /* no more processing in any mode if no users left */
 562             break;
 563         }
 564     }
 565
 566     if (verbose)
 567         BIO_printf(bio_err, "User procession done.\n");
 568
 569     if (doupdatedb) {
 570         /* Lets check some fields */
 571         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 572             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 573
 574             if (pp[DB_srptype][0] == 'v') {
 575                 pp[DB_srptype][0] = 'V';
 576                 print_user(db, i, verbose);
 577             }
 578         }
 579
 580         if (verbose)
 581             BIO_printf(bio_err, "Trying to update srpvfile.\n");
 582         if (!save_index(srpvfile, "new", db))
 583             goto end;
 584
 585         if (verbose)
 586             BIO_printf(bio_err, "Temporary srpvfile created.\n");
 587         if (!rotate_index(srpvfile, "new", "old"))
 588             goto end;
 589
 590         if (verbose)
 591             BIO_printf(bio_err, "srpvfile updated.\n");
 592     }
 593
 594     ret = (errors != 0);
 595  end:
 596     if (errors != 0)
 597         if (verbose)
 598             BIO_printf(bio_err, "User errors %d.\n", errors);
 599
 600     if (verbose)
 601         BIO_printf(bio_err, "SRP terminating with code %d.\n", ret);
 602
 603     OPENSSL_free(passin);
 604     OPENSSL_free(passout);
 605     if (ret)
 606         ERR_print_errors(bio_err);
 607     if (randfile != NULL)
 608         app_RAND_write_file(randfile);
 609     NCONF_free(conf);
 610     free_index(db);
 611     release_engine(e);
 612     return (ret);
 613 }
 614 #endif