apps/srp.c

   1 /*
   2  * Copyright 2004-2016 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     } else
  47         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
  48             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
  49
  50             if (pp[DB_srptype][0] != DB_SRP_INDEX
  51                 && strcmp(id, pp[DB_srpid]) == 0)
  52                 return i;
  53         }
  54
  55     return -1;
  56 }
  57
  58 static void print_entry(CA_DB *db, int indx, int verbose, char *s)
  59 {
  60     if (indx >= 0 && verbose) {
  61         int j;
  62         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, indx);
  63         BIO_printf(bio_err, "%s \"%s\"\n", s, pp[DB_srpid]);
  64         for (j = 0; j < DB_NUMBER; j++) {
  65             BIO_printf(bio_err, "  %d = \"%s\"\n", j, pp[j]);
  66         }
  67     }
  68 }
  69
  70 static void print_index(CA_DB *db, int indexindex, int verbose)
  71 {
  72     print_entry(db, indexindex, verbose, "g N entry");
  73 }
  74
  75 static void print_user(CA_DB *db, int userindex, int verbose)
  76 {
  77     if (verbose > 0) {
  78         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
  79
  80         if (pp[DB_srptype][0] != 'I') {
  81             print_entry(db, userindex, verbose, "User entry");
  82             print_entry(db, get_index(db, pp[DB_srpgN], 'I'), verbose,
  83                         "g N entry");
  84         }
  85
  86     }
  87 }
  88
  89 static int update_index(CA_DB *db, char **row)
  90 {
  91     char **irow;
  92     int i;
  93
  94     irow = app_malloc(sizeof(*irow) * (DB_NUMBER + 1), "row pointers");
  95     for (i = 0; i < DB_NUMBER; i++) {
  96         irow[i] = row[i];
  97         row[i] = NULL;
  98     }
  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 void lookup_fail(const char *name, const char *tag)
 111 {
 112     BIO_printf(bio_err, "variable lookup failed for %s::%s\n", name, tag);
 113 }
 114
 115 static char *srp_verify_user(const char *user, const char *srp_verifier,
 116                              char *srp_usersalt, const char *g, const char *N,
 117                              const char *passin, int verbose)
 118 {
 119     char password[1024];
 120     PW_CB_DATA cb_tmp;
 121     char *verifier = NULL;
 122     char *gNid = NULL;
 123
 124     cb_tmp.prompt_info = user;
 125     cb_tmp.password = passin;
 126
 127     if (password_callback(password, 1024, 0, &cb_tmp) > 0) {
 128         if (verbose)
 129             BIO_printf(bio_err,
 130                        "Validating\n   user=\"%s\"\n srp_verifier=\"%s\"\n srp_usersalt=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 131                        user, srp_verifier, srp_usersalt, g, N);
 132         BIO_printf(bio_err, "Pass %s\n", password);
 133
 134         OPENSSL_assert(srp_usersalt != NULL);
 135         if (!
 136             (gNid =
 137              SRP_create_verifier(user, password, &srp_usersalt, &verifier, N,
 138                                  g))) {
 139             BIO_printf(bio_err, "Internal error validating SRP verifier\n");
 140         } else {
 141             if (strcmp(verifier, srp_verifier))
 142                 gNid = NULL;
 143             OPENSSL_free(verifier);
 144         }
 145     }
 146     return gNid;
 147 }
 148
 149 static char *srp_create_user(char *user, char **srp_verifier,
 150                              char **srp_usersalt, char *g, char *N,
 151                              char *passout, int verbose)
 152 {
 153     char password[1024];
 154     PW_CB_DATA cb_tmp;
 155     char *gNid = NULL;
 156     char *salt = NULL;
 157     cb_tmp.prompt_info = user;
 158     cb_tmp.password = passout;
 159
 160     if (password_callback(password, 1024, 1, &cb_tmp) > 0) {
 161         if (verbose)
 162             BIO_printf(bio_err, "Creating\n user=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 163                        user, g, N);
 164         if (!
 165             (gNid =
 166              SRP_create_verifier(user, password, &salt, srp_verifier, N,
 167                                  g))) {
 168             BIO_printf(bio_err, "Internal error creating SRP verifier\n");
 169         } else
 170             *srp_usersalt = salt;
 171         if (verbose > 1)
 172             BIO_printf(bio_err, "gNid=%s salt =\"%s\"\n verifier =\"%s\"\n", gNid,
 173                        salt, *srp_verifier);
 174
 175     }
 176     return gNid;
 177 }
 178
 179 typedef enum OPTION_choice {
 180     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 181     OPT_VERBOSE, OPT_CONFIG, OPT_NAME, OPT_SRPVFILE, OPT_ADD,
 182     OPT_DELETE, OPT_MODIFY, OPT_LIST, OPT_GN, OPT_USERINFO,
 183     OPT_PASSIN, OPT_PASSOUT, OPT_ENGINE
 184 } OPTION_CHOICE;
 185
 186 OPTIONS srp_options[] = {
 187     {"help", OPT_HELP, '-', "Display this summary"},
 188     {"verbose", OPT_VERBOSE, '-', "Talk a lot while doing things"},
 189     {"config", OPT_CONFIG, '<', "A config file"},
 190     {"name", OPT_NAME, 's', "The particular srp definition to use"},
 191     {"srpvfile", OPT_SRPVFILE, '<', "The srp verifier file name"},
 192     {"add", OPT_ADD, '-', "Add a user and srp verifier"},
 193     {"modify", OPT_MODIFY, '-',
 194      "Modify the srp verifier of an existing user"},
 195     {"delete", OPT_DELETE, '-', "Delete user from verifier file"},
 196     {"list", OPT_LIST, '-', "List users"},
 197     {"gn", OPT_GN, 's', "Set g and N values to be used for new verifier"},
 198     {"userinfo", OPT_USERINFO, 's', "Additional info to be set for user"},
 199     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 200     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
 201 # ifndef OPENSSL_NO_ENGINE
 202     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 203 # endif
 204     {NULL}
 205 };
 206
 207 int srp_main(int argc, char **argv)
 208 {
 209     CA_DB *db = NULL;
 210     CONF *conf = NULL;
 211     int gNindex = -1, maxgN = -1, ret = 1, errors = 0, verbose = 0, i;
 212     int doupdatedb = 0, mode = OPT_ERR;
 213     char *user = NULL, *passinarg = NULL, *passoutarg = NULL;
 214     char *passin = NULL, *passout = NULL, *gN = NULL, *userinfo = NULL;
 215     char *randfile = NULL, *tofree = NULL, *section = NULL;
 216     char **gNrow = NULL, *configfile = NULL;
 217     char *srpvfile = NULL, **pp, *prog;
 218     OPTION_CHOICE o;
 219
 220     prog = opt_init(argc, argv, srp_options);
 221     while ((o = opt_next()) != OPT_EOF) {
 222         switch (o) {
 223         case OPT_EOF:
 224         case OPT_ERR:
 225  opthelp:
 226             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 227             goto end;
 228         case OPT_HELP:
 229             opt_help(srp_options);
 230             ret = 0;
 231             goto end;
 232         case OPT_VERBOSE:
 233             verbose++;
 234             break;
 235         case OPT_CONFIG:
 236             configfile = opt_arg();
 237             break;
 238         case OPT_NAME:
 239             section = opt_arg();
 240             break;
 241         case OPT_SRPVFILE:
 242             srpvfile = opt_arg();
 243             break;
 244         case OPT_ADD:
 245         case OPT_DELETE:
 246         case OPT_MODIFY:
 247         case OPT_LIST:
 248             if (mode != OPT_ERR) {
 249                 BIO_printf(bio_err,
 250                            "%s: Only one of -add/delete-modify/-list\n",
 251                            prog);
 252                 goto opthelp;
 253             }
 254             mode = o;
 255             break;
 256         case OPT_GN:
 257             gN = opt_arg();
 258             break;
 259         case OPT_USERINFO:
 260             userinfo = opt_arg();
 261             break;
 262         case OPT_PASSIN:
 263             passinarg = opt_arg();
 264             break;
 265         case OPT_PASSOUT:
 266             passoutarg = opt_arg();
 267             break;
 268         case OPT_ENGINE:
 269             (void)setup_engine(opt_arg(), 0);
 270             break;
 271         }
 272     }
 273     argc = opt_num_rest();
 274     argv = opt_rest();
 275
 276     if (srpvfile && configfile) {
 277         BIO_printf(bio_err,
 278                    "-srpvfile and -configfile cannot be specified together.\n");
 279         goto end;
 280     }
 281     if (mode == OPT_ERR) {
 282         BIO_printf(bio_err,
 283                    "Exactly one of the options -add, -delete, -modify -list must be specified.\n");
 284         goto opthelp;
 285     }
 286     if ((mode == OPT_DELETE || mode == OPT_MODIFY || mode == OPT_ADD)
 287         && argc < 1) {
 288         BIO_printf(bio_err,
 289                    "Need at least one user for options -add, -delete, -modify. \n");
 290         goto opthelp;
 291     }
 292     if ((passin || passout) && argc != 1) {
 293         BIO_printf(bio_err,
 294                    "-passin, -passout arguments only valid with one user.\n");
 295         goto opthelp;
 296     }
 297
 298     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 299         BIO_printf(bio_err, "Error getting passwords\n");
 300         goto end;
 301     }
 302
 303     if (!srpvfile) {
 304         if (!configfile)
 305             configfile = default_config_file;
 306
 307         if (verbose)
 308             BIO_printf(bio_err, "Using configuration from %s\n",
 309                        configfile);
 310         conf = app_load_config(configfile);
 311         if (conf == NULL)
 312             goto end;
 313         if (configfile != default_config_file && !app_load_modules(conf))
 314             goto end;
 315
 316         /* Lets get the config section we are using */
 317         if (section == NULL) {
 318             if (verbose)
 319                 BIO_printf(bio_err,
 320                            "trying to read " ENV_DEFAULT_SRP
 321                            " in " BASE_SECTION "\n");
 322
 323             section = NCONF_get_string(conf, BASE_SECTION, ENV_DEFAULT_SRP);
 324             if (section == NULL) {
 325                 lookup_fail(BASE_SECTION, ENV_DEFAULT_SRP);
 326                 goto end;
 327             }
 328         }
 329
 330         if (randfile == NULL && conf)
 331             randfile = NCONF_get_string(conf, BASE_SECTION, "RANDFILE");
 332
 333         if (verbose)
 334             BIO_printf(bio_err,
 335                        "trying to read " ENV_DATABASE " in section \"%s\"\n",
 336                        section);
 337
 338         if ((srpvfile = NCONF_get_string(conf, section, ENV_DATABASE))
 339                 == NULL) {
 340             lookup_fail(section, ENV_DATABASE);
 341             goto end;
 342         }
 343
 344     }
 345     if (randfile == NULL)
 346         ERR_clear_error();
 347     else
 348         app_RAND_load_file(randfile, 0);
 349
 350     if (verbose)
 351         BIO_printf(bio_err, "Trying to read SRP verifier file \"%s\"\n",
 352                    srpvfile);
 353
 354     db = load_index(srpvfile, NULL);
 355     if (db == NULL)
 356         goto end;
 357
 358     /* Lets check some fields */
 359     for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 360         pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 361
 362         if (pp[DB_srptype][0] == DB_SRP_INDEX) {
 363             maxgN = i;
 364             if ((gNindex < 0) && (gN != NULL) && strcmp(gN, pp[DB_srpid]) == 0)
 365                 gNindex = i;
 366
 367             print_index(db, i, verbose > 1);
 368         }
 369     }
 370
 371     if (verbose)
 372         BIO_printf(bio_err, "Database initialised\n");
 373
 374     if (gNindex >= 0) {
 375         gNrow = sk_OPENSSL_PSTRING_value(db->db->data, gNindex);
 376         print_entry(db, gNindex, verbose > 1, "Default g and N");
 377     } else if (maxgN > 0 && !SRP_get_default_gN(gN)) {
 378         BIO_printf(bio_err, "No g and N value for index \"%s\"\n", gN);
 379         goto end;
 380     } else {
 381         if (verbose)
 382             BIO_printf(bio_err, "Database has no g N information.\n");
 383         gNrow = NULL;
 384     }
 385
 386     if (verbose > 1)
 387         BIO_printf(bio_err, "Starting user processing\n");
 388
 389     if (argc > 0)
 390         user = *(argv++);
 391
 392     while (mode == OPT_LIST || user) {
 393         int userindex = -1;
 394         if (user)
 395             if (verbose > 1)
 396                 BIO_printf(bio_err, "Processing user \"%s\"\n", user);
 397         if ((userindex = get_index(db, user, 'U')) >= 0) {
 398             print_user(db, userindex, (verbose > 0)
 399                        || mode == OPT_LIST);
 400         }
 401
 402         if (mode == OPT_LIST) {
 403             if (user == NULL) {
 404                 BIO_printf(bio_err, "List all users\n");
 405
 406                 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 407                     print_user(db, i, 1);
 408                 }
 409             } else if (userindex < 0) {
 410                 BIO_printf(bio_err,
 411                            "user \"%s\" does not exist, ignored. t\n", user);
 412                 errors++;
 413             }
 414         } else if (mode == OPT_ADD) {
 415             if (userindex >= 0) {
 416                 /* reactivation of a new user */
 417                 char **row =
 418                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 419                 BIO_printf(bio_err, "user \"%s\" reactivated.\n", user);
 420                 row[DB_srptype][0] = 'V';
 421
 422                 doupdatedb = 1;
 423             } else {
 424                 char *row[DB_NUMBER];
 425                 char *gNid;
 426                 row[DB_srpverifier] = NULL;
 427                 row[DB_srpsalt] = NULL;
 428                 row[DB_srpinfo] = NULL;
 429                 if (!
 430                     (gNid =
 431                      srp_create_user(user, &(row[DB_srpverifier]),
 432                                      &(row[DB_srpsalt]),
 433                                      gNrow ? gNrow[DB_srpsalt] : gN,
 434                                      gNrow ? gNrow[DB_srpverifier] : NULL,
 435                                      passout, verbose))) {
 436                     BIO_printf(bio_err,
 437                                "Cannot create srp verifier for user \"%s\", operation abandoned .\n",
 438                                user);
 439                     errors++;
 440                     goto end;
 441                 }
 442                 row[DB_srpid] = OPENSSL_strdup(user);
 443                 row[DB_srptype] = OPENSSL_strdup("v");
 444                 row[DB_srpgN] = OPENSSL_strdup(gNid);
 445
 446                 if ((row[DB_srpid] == NULL)
 447                     || (row[DB_srpgN] == NULL)
 448                     || (row[DB_srptype] == NULL)
 449                     || (row[DB_srpverifier] == NULL)
 450                     || (row[DB_srpsalt] == NULL)
 451                     || (userinfo
 452                         && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo)) == NULL))
 453                     || !update_index(db, row)) {
 454                     OPENSSL_free(row[DB_srpid]);
 455                     OPENSSL_free(row[DB_srpgN]);
 456                     OPENSSL_free(row[DB_srpinfo]);
 457                     OPENSSL_free(row[DB_srptype]);
 458                     OPENSSL_free(row[DB_srpverifier]);
 459                     OPENSSL_free(row[DB_srpsalt]);
 460                     goto end;
 461                 }
 462                 doupdatedb = 1;
 463             }
 464         } else if (mode == OPT_MODIFY) {
 465             if (userindex < 0) {
 466                 BIO_printf(bio_err,
 467                            "user \"%s\" does not exist, operation ignored.\n",
 468                            user);
 469                 errors++;
 470             } else {
 471
 472                 char **row =
 473                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 474                 char type = row[DB_srptype][0];
 475                 if (type == 'v') {
 476                     BIO_printf(bio_err,
 477                                "user \"%s\" already updated, operation ignored.\n",
 478                                user);
 479                     errors++;
 480                 } else {
 481                     char *gNid;
 482
 483                     if (row[DB_srptype][0] == 'V') {
 484                         int user_gN;
 485                         char **irow = NULL;
 486                         if (verbose)
 487                             BIO_printf(bio_err,
 488                                        "Verifying password for user \"%s\"\n",
 489                                        user);
 490                         if ((user_gN =
 491                              get_index(db, row[DB_srpgN], DB_SRP_INDEX)) >= 0)
 492                             irow =
 493                                 sk_OPENSSL_PSTRING_value(db->db->data,
 494                                                          userindex);
 495
 496                         if (!srp_verify_user
 497                             (user, row[DB_srpverifier], row[DB_srpsalt],
 498                              irow ? irow[DB_srpsalt] : row[DB_srpgN],
 499                              irow ? irow[DB_srpverifier] : NULL, passin,
 500                              verbose)) {
 501                             BIO_printf(bio_err,
 502                                        "Invalid password for user \"%s\", operation abandoned.\n",
 503                                        user);
 504                             errors++;
 505                             goto end;
 506                         }
 507                     }
 508                     if (verbose)
 509                         BIO_printf(bio_err, "Password for user \"%s\" ok.\n",
 510                                    user);
 511
 512                     if (!
 513                         (gNid =
 514                          srp_create_user(user, &(row[DB_srpverifier]),
 515                                          &(row[DB_srpsalt]),
 516                                          gNrow ? gNrow[DB_srpsalt] : NULL,
 517                                          gNrow ? gNrow[DB_srpverifier] : NULL,
 518                                          passout, verbose))) {
 519                         BIO_printf(bio_err,
 520                                    "Cannot create srp verifier for user \"%s\", operation abandoned.\n",
 521                                    user);
 522                         errors++;
 523                         goto end;
 524                     }
 525
 526                     row[DB_srptype][0] = 'v';
 527                     row[DB_srpgN] = OPENSSL_strdup(gNid);
 528
 529                     if (row[DB_srpid] == NULL
 530                         || row[DB_srpgN] == NULL
 531                         || row[DB_srptype] == NULL
 532                         || row[DB_srpverifier] == NULL
 533                         || row[DB_srpsalt] == NULL
 534                         || (userinfo
 535                             && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo))
 536                                 == NULL)))
 537                         goto end;
 538
 539                     doupdatedb = 1;
 540                 }
 541             }
 542         } else if (mode == OPT_DELETE) {
 543             if (userindex < 0) {
 544                 BIO_printf(bio_err,
 545                            "user \"%s\" does not exist, operation ignored. t\n",
 546                            user);
 547                 errors++;
 548             } else {
 549                 char **xpp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 550
 551                 BIO_printf(bio_err, "user \"%s\" revoked. t\n", user);
 552                 xpp[DB_srptype][0] = 'R';
 553                 doupdatedb = 1;
 554             }
 555         }
 556         if (--argc > 0)
 557             user = *(argv++);
 558         else {
 559             user = NULL;
 560         }
 561     }
 562
 563     if (verbose)
 564         BIO_printf(bio_err, "User procession done.\n");
 565
 566     if (doupdatedb) {
 567         /* Lets check some fields */
 568         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 569             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 570
 571             if (pp[DB_srptype][0] == 'v') {
 572                 pp[DB_srptype][0] = 'V';
 573                 print_user(db, i, verbose);
 574             }
 575         }
 576
 577         if (verbose)
 578             BIO_printf(bio_err, "Trying to update srpvfile.\n");
 579         if (!save_index(srpvfile, "new", db))
 580             goto end;
 581
 582         if (verbose)
 583             BIO_printf(bio_err, "Temporary srpvfile created.\n");
 584         if (!rotate_index(srpvfile, "new", "old"))
 585             goto end;
 586
 587         if (verbose)
 588             BIO_printf(bio_err, "srpvfile updated.\n");
 589     }
 590
 591     ret = (errors != 0);
 592  end:
 593     if (errors != 0)
 594         if (verbose)
 595             BIO_printf(bio_err, "User errors %d.\n", errors);
 596
 597     if (verbose)
 598         BIO_printf(bio_err, "SRP terminating with code %d.\n", ret);
 599     OPENSSL_free(tofree);
 600     if (ret)
 601         ERR_print_errors(bio_err);
 602     if (randfile)
 603         app_RAND_write_file(randfile);
 604     NCONF_free(conf);
 605     free_index(db);
 606     return (ret);
 607 }
 608 #endif