apps/srp.c

   1 /*
   2  * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2004, EdelKey Project. All Rights Reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  *
  10  * Originally written by Christophe Renou and Peter Sylvester,
  11  * for the EdelKey project.
  12  */
  13
  14 #include <openssl/opensslconf.h>
  15 #ifdef OPENSSL_NO_SRP
  16 NON_EMPTY_TRANSLATION_UNIT
  17 #else
  18
  19 # include <stdio.h>
  20 # include <stdlib.h>
  21 # include <string.h>
  22 # include <openssl/conf.h>
  23 # include <openssl/bio.h>
  24 # include <openssl/err.h>
  25 # include <openssl/txt_db.h>
  26 # include <openssl/buffer.h>
  27 # include <openssl/srp.h>
  28 # include "apps.h"
  29 # include "progs.h"
  30
  31 # define BASE_SECTION    "srp"
  32 # define CONFIG_FILE "openssl.cnf"
  33
  34
  35 # define ENV_DATABASE            "srpvfile"
  36 # define ENV_DEFAULT_SRP         "default_srp"
  37
  38 static int get_index(CA_DB *db, char *id, char type)
  39 {
  40     char **pp;
  41     int i;
  42     if (id == NULL)
  43         return -1;
  44     if (type == DB_SRP_INDEX) {
  45         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
  46             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
  47             if (pp[DB_srptype][0] == DB_SRP_INDEX
  48                 && strcmp(id, pp[DB_srpid]) == 0)
  49                 return i;
  50         }
  51     } else {
  52         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
  53             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
  54
  55             if (pp[DB_srptype][0] != DB_SRP_INDEX
  56                 && strcmp(id, pp[DB_srpid]) == 0)
  57                 return i;
  58         }
  59     }
  60
  61     return -1;
  62 }
  63
  64 static void print_entry(CA_DB *db, int indx, int verbose, char *s)
  65 {
  66     if (indx >= 0 && verbose) {
  67         int j;
  68         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, indx);
  69         BIO_printf(bio_err, "%s \"%s\"\n", s, pp[DB_srpid]);
  70         for (j = 0; j < DB_NUMBER; j++) {
  71             BIO_printf(bio_err, "  %d = \"%s\"\n", j, pp[j]);
  72         }
  73     }
  74 }
  75
  76 static void print_index(CA_DB *db, int indexindex, int verbose)
  77 {
  78     print_entry(db, indexindex, verbose, "g N entry");
  79 }
  80
  81 static void print_user(CA_DB *db, int userindex, int verbose)
  82 {
  83     if (verbose > 0) {
  84         char **pp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
  85
  86         if (pp[DB_srptype][0] != 'I') {
  87             print_entry(db, userindex, verbose, "User entry");
  88             print_entry(db, get_index(db, pp[DB_srpgN], 'I'), verbose,
  89                         "g N entry");
  90         }
  91
  92     }
  93 }
  94
  95 static int update_index(CA_DB *db, char **row)
  96 {
  97     char **irow;
  98     int i;
  99
 100     irow = app_malloc(sizeof(*irow) * (DB_NUMBER + 1), "row pointers");
 101     for (i = 0; i < DB_NUMBER; i++)
 102         irow[i] = row[i];
 103     irow[DB_NUMBER] = NULL;
 104
 105     if (!TXT_DB_insert(db->db, irow)) {
 106         BIO_printf(bio_err, "failed to update srpvfile\n");
 107         BIO_printf(bio_err, "TXT_DB error number %ld\n", db->db->error);
 108         OPENSSL_free(irow);
 109         return 0;
 110     }
 111     return 1;
 112 }
 113
 114 static char *lookup_conf(const CONF *conf, const char *section, const char *tag)
 115 {
 116     char *entry = NCONF_get_string(conf, section, tag);
 117     if (entry == NULL)
 118         BIO_printf(bio_err, "variable lookup failed for %s::%s\n", section, tag);
 119     return entry;
 120 }
 121
 122 static char *srp_verify_user(const char *user, const char *srp_verifier,
 123                              char *srp_usersalt, const char *g, const char *N,
 124                              const char *passin, int verbose)
 125 {
 126     char password[1025];
 127     PW_CB_DATA cb_tmp;
 128     char *verifier = NULL;
 129     char *gNid = NULL;
 130     int len;
 131
 132     cb_tmp.prompt_info = user;
 133     cb_tmp.password = passin;
 134
 135     len = password_callback(password, sizeof(password)-1, 0, &cb_tmp);
 136     if (len > 0) {
 137         password[len] = 0;
 138         if (verbose)
 139             BIO_printf(bio_err,
 140                        "Validating\n   user=\"%s\"\n srp_verifier=\"%s\"\n srp_usersalt=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 141                        user, srp_verifier, srp_usersalt, g, N);
 142         if (verbose > 1)
 143             BIO_printf(bio_err, "Pass %s\n", password);
 144
 145         OPENSSL_assert(srp_usersalt != NULL);
 146         if ((gNid = SRP_create_verifier(user, password, &srp_usersalt,
 147                                         &verifier, N, g)) == NULL) {
 148             BIO_printf(bio_err, "Internal error validating SRP verifier\n");
 149         } else {
 150             if (strcmp(verifier, srp_verifier))
 151                 gNid = NULL;
 152             OPENSSL_free(verifier);
 153         }
 154         OPENSSL_cleanse(password, len);
 155     }
 156     return gNid;
 157 }
 158
 159 static char *srp_create_user(char *user, char **srp_verifier,
 160                              char **srp_usersalt, char *g, char *N,
 161                              char *passout, int verbose)
 162 {
 163     char password[1025];
 164     PW_CB_DATA cb_tmp;
 165     char *gNid = NULL;
 166     char *salt = NULL;
 167     int len;
 168     cb_tmp.prompt_info = user;
 169     cb_tmp.password = passout;
 170
 171     len = password_callback(password, sizeof(password)-1, 1, &cb_tmp);
 172     if (len > 0) {
 173         password[len] = 0;
 174         if (verbose)
 175             BIO_printf(bio_err, "Creating\n user=\"%s\"\n g=\"%s\"\n N=\"%s\"\n",
 176                        user, g, N);
 177         if ((gNid = SRP_create_verifier(user, password, &salt,
 178                                         srp_verifier, N, g)) == NULL) {
 179             BIO_printf(bio_err, "Internal error creating SRP verifier\n");
 180         } else {
 181             *srp_usersalt = salt;
 182         }
 183         OPENSSL_cleanse(password, len);
 184         if (verbose > 1)
 185             BIO_printf(bio_err, "gNid=%s salt =\"%s\"\n verifier =\"%s\"\n",
 186                        gNid, salt, *srp_verifier);
 187
 188     }
 189     return gNid;
 190 }
 191
 192 typedef enum OPTION_choice {
 193     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
 194     OPT_VERBOSE, OPT_CONFIG, OPT_NAME, OPT_SRPVFILE, OPT_ADD,
 195     OPT_DELETE, OPT_MODIFY, OPT_LIST, OPT_GN, OPT_USERINFO,
 196     OPT_PASSIN, OPT_PASSOUT, OPT_ENGINE, OPT_R_ENUM
 197 } OPTION_CHOICE;
 198
 199 const OPTIONS srp_options[] = {
 200     {OPT_HELP_STR, 1, '-', "Usage: %s [options] [user...]\n"},
 201
 202     OPT_SECTION("General"),
 203     {"help", OPT_HELP, '-', "Display this summary"},
 204     {"verbose", OPT_VERBOSE, '-', "Talk a lot while doing things"},
 205     {"config", OPT_CONFIG, '<', "A config file"},
 206     {"name", OPT_NAME, 's', "The particular srp definition to use"},
 207 # ifndef OPENSSL_NO_ENGINE
 208     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
 209 # endif
 210
 211     OPT_SECTION("Action"),
 212     {"add", OPT_ADD, '-', "Add a user and srp verifier"},
 213     {"modify", OPT_MODIFY, '-', "Modify the srp verifier of an existing user"},
 214     {"delete", OPT_DELETE, '-', "Delete user from verifier file"},
 215     {"list", OPT_LIST, '-', "List users"},
 216
 217     OPT_SECTION("Configuration"),
 218     {"srpvfile", OPT_SRPVFILE, '<', "The srp verifier file name"},
 219     {"gn", OPT_GN, 's', "Set g and N values to be used for new verifier"},
 220     {"userinfo", OPT_USERINFO, 's', "Additional info to be set for user"},
 221     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
 222     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
 223
 224     OPT_R_OPTIONS,
 225
 226     OPT_PARAMETERS(),
 227     {"user", 0, 0, "Username(s) to process (optional)"},
 228     {NULL}
 229 };
 230
 231 int srp_main(int argc, char **argv)
 232 {
 233     ENGINE *e = NULL;
 234     CA_DB *db = NULL;
 235     CONF *conf = NULL;
 236     int gNindex = -1, maxgN = -1, ret = 1, errors = 0, verbose = 0, i;
 237     int doupdatedb = 0, mode = OPT_ERR;
 238     char *user = NULL, *passinarg = NULL, *passoutarg = NULL;
 239     char *passin = NULL, *passout = NULL, *gN = NULL, *userinfo = NULL;
 240     char *section = NULL;
 241     char **gNrow = NULL, *configfile = NULL;
 242     char *srpvfile = NULL, **pp, *prog;
 243     OPTION_CHOICE o;
 244
 245     prog = opt_init(argc, argv, srp_options);
 246     while ((o = opt_next()) != OPT_EOF) {
 247         switch (o) {
 248         case OPT_EOF:
 249         case OPT_ERR:
 250  opthelp:
 251             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 252             goto end;
 253         case OPT_HELP:
 254             opt_help(srp_options);
 255             ret = 0;
 256             goto end;
 257         case OPT_VERBOSE:
 258             verbose++;
 259             break;
 260         case OPT_CONFIG:
 261             configfile = opt_arg();
 262             break;
 263         case OPT_NAME:
 264             section = opt_arg();
 265             break;
 266         case OPT_SRPVFILE:
 267             srpvfile = opt_arg();
 268             break;
 269         case OPT_ADD:
 270         case OPT_DELETE:
 271         case OPT_MODIFY:
 272         case OPT_LIST:
 273             if (mode != OPT_ERR) {
 274                 BIO_printf(bio_err,
 275                            "%s: Only one of -add/-delete/-modify/-list\n",
 276                            prog);
 277                 goto opthelp;
 278             }
 279             mode = o;
 280             break;
 281         case OPT_GN:
 282             gN = opt_arg();
 283             break;
 284         case OPT_USERINFO:
 285             userinfo = opt_arg();
 286             break;
 287         case OPT_PASSIN:
 288             passinarg = opt_arg();
 289             break;
 290         case OPT_PASSOUT:
 291             passoutarg = opt_arg();
 292             break;
 293         case OPT_ENGINE:
 294             e = setup_engine(opt_arg(), 0);
 295             break;
 296         case OPT_R_CASES:
 297             if (!opt_rand(o))
 298                 goto end;
 299             break;
 300         }
 301     }
 302     argc = opt_num_rest();
 303     argv = opt_rest();
 304
 305     if (srpvfile != NULL && configfile != NULL) {
 306         BIO_printf(bio_err,
 307                    "-srpvfile and -configfile cannot be specified together.\n");
 308         goto end;
 309     }
 310     if (mode == OPT_ERR) {
 311         BIO_printf(bio_err,
 312                    "Exactly one of the options -add, -delete, -modify -list must be specified.\n");
 313         goto opthelp;
 314     }
 315     if (mode == OPT_DELETE || mode == OPT_MODIFY || mode == OPT_ADD) {
 316         if (argc == 0) {
 317             BIO_printf(bio_err, "Need at least one user.\n");
 318             goto opthelp;
 319         }
 320         user = *argv++;
 321     }
 322     if ((passinarg != NULL || passoutarg != NULL) && argc != 1) {
 323         BIO_printf(bio_err,
 324                    "-passin, -passout arguments only valid with one user.\n");
 325         goto opthelp;
 326     }
 327
 328     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
 329         BIO_printf(bio_err, "Error getting passwords\n");
 330         goto end;
 331     }
 332
 333     if (srpvfile == NULL) {
 334         if (configfile == NULL)
 335             configfile = default_config_file;
 336
 337         if (verbose)
 338             BIO_printf(bio_err, "Using configuration from %s\n",
 339                        configfile);
 340         conf = app_load_config(configfile);
 341         if (conf == NULL)
 342             goto end;
 343         if (configfile != default_config_file && !app_load_modules(conf))
 344             goto end;
 345
 346         /* Lets get the config section we are using */
 347         if (section == NULL) {
 348             if (verbose)
 349                 BIO_printf(bio_err,
 350                            "trying to read " ENV_DEFAULT_SRP
 351                            " in " BASE_SECTION "\n");
 352
 353             section = lookup_conf(conf, BASE_SECTION, ENV_DEFAULT_SRP);
 354             if (section == NULL)
 355                 goto end;
 356         }
 357
 358         app_RAND_load_conf(conf, BASE_SECTION);
 359
 360         if (verbose)
 361             BIO_printf(bio_err,
 362                        "trying to read " ENV_DATABASE " in section \"%s\"\n",
 363                        section);
 364
 365         srpvfile = lookup_conf(conf, section, ENV_DATABASE);
 366         if (srpvfile == NULL)
 367             goto end;
 368     }
 369
 370     if (verbose)
 371         BIO_printf(bio_err, "Trying to read SRP verifier file \"%s\"\n",
 372                    srpvfile);
 373
 374     db = load_index(srpvfile, NULL);
 375     if (db == NULL)
 376         goto end;
 377
 378     /* Lets check some fields */
 379     for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 380         pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 381
 382         if (pp[DB_srptype][0] == DB_SRP_INDEX) {
 383             maxgN = i;
 384             if ((gNindex < 0) && (gN != NULL) && strcmp(gN, pp[DB_srpid]) == 0)
 385                 gNindex = i;
 386
 387             print_index(db, i, verbose > 1);
 388         }
 389     }
 390
 391     if (verbose)
 392         BIO_printf(bio_err, "Database initialised\n");
 393
 394     if (gNindex >= 0) {
 395         gNrow = sk_OPENSSL_PSTRING_value(db->db->data, gNindex);
 396         print_entry(db, gNindex, verbose > 1, "Default g and N");
 397     } else if (maxgN > 0 && !SRP_get_default_gN(gN)) {
 398         BIO_printf(bio_err, "No g and N value for index \"%s\"\n", gN);
 399         goto end;
 400     } else {
 401         if (verbose)
 402             BIO_printf(bio_err, "Database has no g N information.\n");
 403         gNrow = NULL;
 404     }
 405
 406     if (verbose > 1)
 407         BIO_printf(bio_err, "Starting user processing\n");
 408
 409     while (mode == OPT_LIST || user != NULL) {
 410         int userindex = -1;
 411
 412         if (user != NULL && verbose > 1)
 413             BIO_printf(bio_err, "Processing user \"%s\"\n", user);
 414         if ((userindex = get_index(db, user, 'U')) >= 0)
 415             print_user(db, userindex, (verbose > 0) || mode == OPT_LIST);
 416
 417         if (mode == OPT_LIST) {
 418             if (user == NULL) {
 419                 BIO_printf(bio_err, "List all users\n");
 420
 421                 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++)
 422                     print_user(db, i, 1);
 423             } else if (userindex < 0) {
 424                 BIO_printf(bio_err,
 425                            "user \"%s\" does not exist, ignored. t\n", user);
 426                 errors++;
 427             }
 428         } else if (mode == OPT_ADD) {
 429             if (userindex >= 0) {
 430                 /* reactivation of a new user */
 431                 char **row =
 432                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 433                 BIO_printf(bio_err, "user \"%s\" reactivated.\n", user);
 434                 row[DB_srptype][0] = 'V';
 435
 436                 doupdatedb = 1;
 437             } else {
 438                 char *row[DB_NUMBER];
 439                 char *gNid;
 440                 row[DB_srpverifier] = NULL;
 441                 row[DB_srpsalt] = NULL;
 442                 row[DB_srpinfo] = NULL;
 443                 if (!
 444                     (gNid =
 445                      srp_create_user(user, &(row[DB_srpverifier]),
 446                                      &(row[DB_srpsalt]),
 447                                      gNrow ? gNrow[DB_srpsalt] : gN,
 448                                      gNrow ? gNrow[DB_srpverifier] : NULL,
 449                                      passout, verbose))) {
 450                     BIO_printf(bio_err,
 451                                "Cannot create srp verifier for user \"%s\", operation abandoned .\n",
 452                                user);
 453                     errors++;
 454                     goto end;
 455                 }
 456                 row[DB_srpid] = OPENSSL_strdup(user);
 457                 row[DB_srptype] = OPENSSL_strdup("v");
 458                 row[DB_srpgN] = OPENSSL_strdup(gNid);
 459
 460                 if ((row[DB_srpid] == NULL)
 461                     || (row[DB_srpgN] == NULL)
 462                     || (row[DB_srptype] == NULL)
 463                     || (row[DB_srpverifier] == NULL)
 464                     || (row[DB_srpsalt] == NULL)
 465                     || (userinfo
 466                         && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo)) == NULL))
 467                     || !update_index(db, row)) {
 468                     OPENSSL_free(row[DB_srpid]);
 469                     OPENSSL_free(row[DB_srpgN]);
 470                     OPENSSL_free(row[DB_srpinfo]);
 471                     OPENSSL_free(row[DB_srptype]);
 472                     OPENSSL_free(row[DB_srpverifier]);
 473                     OPENSSL_free(row[DB_srpsalt]);
 474                     goto end;
 475                 }
 476                 doupdatedb = 1;
 477             }
 478         } else if (mode == OPT_MODIFY) {
 479             if (userindex < 0) {
 480                 BIO_printf(bio_err,
 481                            "user \"%s\" does not exist, operation ignored.\n",
 482                            user);
 483                 errors++;
 484             } else {
 485
 486                 char **row =
 487                     sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 488                 char type = row[DB_srptype][0];
 489                 if (type == 'v') {
 490                     BIO_printf(bio_err,
 491                                "user \"%s\" already updated, operation ignored.\n",
 492                                user);
 493                     errors++;
 494                 } else {
 495                     char *gNid;
 496
 497                     if (row[DB_srptype][0] == 'V') {
 498                         int user_gN;
 499                         char **irow = NULL;
 500                         if (verbose)
 501                             BIO_printf(bio_err,
 502                                        "Verifying password for user \"%s\"\n",
 503                                        user);
 504                         if ((user_gN =
 505                              get_index(db, row[DB_srpgN], DB_SRP_INDEX)) >= 0)
 506                             irow =
 507                                 sk_OPENSSL_PSTRING_value(db->db->data,
 508                                                          userindex);
 509
 510                         if (!srp_verify_user
 511                             (user, row[DB_srpverifier], row[DB_srpsalt],
 512                              irow ? irow[DB_srpsalt] : row[DB_srpgN],
 513                              irow ? irow[DB_srpverifier] : NULL, passin,
 514                              verbose)) {
 515                             BIO_printf(bio_err,
 516                                        "Invalid password for user \"%s\", operation abandoned.\n",
 517                                        user);
 518                             errors++;
 519                             goto end;
 520                         }
 521                     }
 522                     if (verbose)
 523                         BIO_printf(bio_err, "Password for user \"%s\" ok.\n",
 524                                    user);
 525
 526                     if (!
 527                         (gNid =
 528                          srp_create_user(user, &(row[DB_srpverifier]),
 529                                          &(row[DB_srpsalt]),
 530                                          gNrow ? gNrow[DB_srpsalt] : NULL,
 531                                          gNrow ? gNrow[DB_srpverifier] : NULL,
 532                                          passout, verbose))) {
 533                         BIO_printf(bio_err,
 534                                    "Cannot create srp verifier for user \"%s\", operation abandoned.\n",
 535                                    user);
 536                         errors++;
 537                         goto end;
 538                     }
 539
 540                     row[DB_srptype][0] = 'v';
 541                     row[DB_srpgN] = OPENSSL_strdup(gNid);
 542
 543                     if (row[DB_srpid] == NULL
 544                         || row[DB_srpgN] == NULL
 545                         || row[DB_srptype] == NULL
 546                         || row[DB_srpverifier] == NULL
 547                         || row[DB_srpsalt] == NULL
 548                         || (userinfo
 549                             && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo))
 550                                 == NULL)))
 551                         goto end;
 552
 553                     doupdatedb = 1;
 554                 }
 555             }
 556         } else if (mode == OPT_DELETE) {
 557             if (userindex < 0) {
 558                 BIO_printf(bio_err,
 559                            "user \"%s\" does not exist, operation ignored. t\n",
 560                            user);
 561                 errors++;
 562             } else {
 563                 char **xpp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
 564
 565                 BIO_printf(bio_err, "user \"%s\" revoked. t\n", user);
 566                 xpp[DB_srptype][0] = 'R';
 567                 doupdatedb = 1;
 568             }
 569         }
 570         user = *argv++;
 571         if (user == NULL) {
 572             /* no more processing in any mode if no users left */
 573             break;
 574         }
 575     }
 576
 577     if (verbose)
 578         BIO_printf(bio_err, "User procession done.\n");
 579
 580     if (doupdatedb) {
 581         /* Lets check some fields */
 582         for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
 583             pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
 584
 585             if (pp[DB_srptype][0] == 'v') {
 586                 pp[DB_srptype][0] = 'V';
 587                 print_user(db, i, verbose);
 588             }
 589         }
 590
 591         if (verbose)
 592             BIO_printf(bio_err, "Trying to update srpvfile.\n");
 593         if (!save_index(srpvfile, "new", db))
 594             goto end;
 595
 596         if (verbose)
 597             BIO_printf(bio_err, "Temporary srpvfile created.\n");
 598         if (!rotate_index(srpvfile, "new", "old"))
 599             goto end;
 600
 601         if (verbose)
 602             BIO_printf(bio_err, "srpvfile updated.\n");
 603     }
 604
 605     ret = (errors != 0);
 606  end:
 607     if (errors != 0)
 608         if (verbose)
 609             BIO_printf(bio_err, "User errors %d.\n", errors);
 610
 611     if (verbose)
 612         BIO_printf(bio_err, "SRP terminating with code %d.\n", ret);
 613
 614     OPENSSL_free(passin);
 615     OPENSSL_free(passout);
 616     if (ret)
 617         ERR_print_errors(bio_err);
 618     NCONF_free(conf);
 619     free_index(db);
 620     release_engine(e);
 621     return ret;
 622 }
 623 #endif