1 /*
2 * Copyright 2004-2021 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 /* SRP is deprecated, so we're going to have to use some deprecated APIs */
15 #define OPENSSL_SUPPRESS_DEPRECATED
16
17 #include <openssl/opensslconf.h>
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
get_index(CA_DB * db,char * id,char type)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
print_entry(CA_DB * db,int indx,int verbose,char * s)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
print_index(CA_DB * db,int indexindex,int verbose)76 static void print_index(CA_DB *db, int indexindex, int verbose)
77 {
78 print_entry(db, indexindex, verbose, "g N entry");
79 }
80
print_user(CA_DB * db,int userindex,int verbose)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
update_index(CA_DB * db,char ** row)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
lookup_conf(const CONF * conf,const char * section,const char * tag)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
srp_verify_user(const char * user,const char * srp_verifier,char * srp_usersalt,const char * g,const char * N,const char * passin,int verbose)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
srp_create_user(char * user,char ** srp_verifier,char ** srp_usersalt,char * g,char * N,char * passout,int verbose)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_COMMON,
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, OPT_PROV_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 OPT_PROV_OPTIONS,
226
227 OPT_PARAMETERS(),
228 {"user", 0, 0, "Username(s) to process (optional)"},
229 {NULL}
230 };
231
srp_main(int argc,char ** argv)232 int srp_main(int argc, char **argv)
233 {
234 ENGINE *e = NULL;
235 CA_DB *db = NULL;
236 CONF *conf = NULL;
237 int gNindex = -1, maxgN = -1, ret = 1, errors = 0, verbose = 0, i;
238 int doupdatedb = 0, mode = OPT_ERR;
239 char *user = NULL, *passinarg = NULL, *passoutarg = NULL;
240 char *passin = NULL, *passout = NULL, *gN = NULL, *userinfo = NULL;
241 char *section = NULL;
242 char **gNrow = NULL, *configfile = NULL;
243 char *srpvfile = NULL, **pp, *prog;
244 OPTION_CHOICE o;
245
246 prog = opt_init(argc, argv, srp_options);
247 while ((o = opt_next()) != OPT_EOF) {
248 switch (o) {
249 case OPT_EOF:
250 case OPT_ERR:
251 opthelp:
252 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
253 goto end;
254 case OPT_HELP:
255 opt_help(srp_options);
256 ret = 0;
257 goto end;
258 case OPT_VERBOSE:
259 verbose++;
260 break;
261 case OPT_CONFIG:
262 configfile = opt_arg();
263 break;
264 case OPT_NAME:
265 section = opt_arg();
266 break;
267 case OPT_SRPVFILE:
268 srpvfile = opt_arg();
269 break;
270 case OPT_ADD:
271 case OPT_DELETE:
272 case OPT_MODIFY:
273 case OPT_LIST:
274 if (mode != OPT_ERR) {
275 BIO_printf(bio_err,
276 "%s: Only one of -add/-delete/-modify/-list\n",
277 prog);
278 goto opthelp;
279 }
280 mode = o;
281 break;
282 case OPT_GN:
283 gN = opt_arg();
284 break;
285 case OPT_USERINFO:
286 userinfo = opt_arg();
287 break;
288 case OPT_PASSIN:
289 passinarg = opt_arg();
290 break;
291 case OPT_PASSOUT:
292 passoutarg = opt_arg();
293 break;
294 case OPT_ENGINE:
295 e = setup_engine(opt_arg(), 0);
296 break;
297 case OPT_R_CASES:
298 if (!opt_rand(o))
299 goto end;
300 break;
301 case OPT_PROV_CASES:
302 if (!opt_provider(o))
303 goto end;
304 break;
305 }
306 }
307
308 /* Optional parameters are usernames. */
309 argc = opt_num_rest();
310 argv = opt_rest();
311
312 if (!app_RAND_load())
313 goto end;
314
315 if (srpvfile != NULL && configfile != NULL) {
316 BIO_printf(bio_err,
317 "-srpvfile and -configfile cannot be specified together.\n");
318 goto end;
319 }
320 if (mode == OPT_ERR) {
321 BIO_printf(bio_err,
322 "Exactly one of the options -add, -delete, -modify -list must be specified.\n");
323 goto opthelp;
324 }
325 if (mode == OPT_DELETE || mode == OPT_MODIFY || mode == OPT_ADD) {
326 if (argc == 0) {
327 BIO_printf(bio_err, "Need at least one user.\n");
328 goto opthelp;
329 }
330 user = *argv++;
331 }
332 if ((passinarg != NULL || passoutarg != NULL) && argc != 1) {
333 BIO_printf(bio_err,
334 "-passin, -passout arguments only valid with one user.\n");
335 goto opthelp;
336 }
337
338 if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
339 BIO_printf(bio_err, "Error getting passwords\n");
340 goto end;
341 }
342
343 if (srpvfile == NULL) {
344 if (configfile == NULL)
345 configfile = default_config_file;
346
347 conf = app_load_config_verbose(configfile, verbose);
348 if (conf == NULL)
349 goto end;
350 if (configfile != default_config_file && !app_load_modules(conf))
351 goto end;
352
353 /* Lets get the config section we are using */
354 if (section == NULL) {
355 if (verbose)
356 BIO_printf(bio_err,
357 "trying to read " ENV_DEFAULT_SRP
358 " in " BASE_SECTION "\n");
359
360 section = lookup_conf(conf, BASE_SECTION, ENV_DEFAULT_SRP);
361 if (section == NULL)
362 goto end;
363 }
364
365 app_RAND_load_conf(conf, BASE_SECTION);
366
367 if (verbose)
368 BIO_printf(bio_err,
369 "trying to read " ENV_DATABASE " in section \"%s\"\n",
370 section);
371
372 srpvfile = lookup_conf(conf, section, ENV_DATABASE);
373 if (srpvfile == NULL)
374 goto end;
375 }
376
377 if (verbose)
378 BIO_printf(bio_err, "Trying to read SRP verifier file \"%s\"\n",
379 srpvfile);
380
381 db = load_index(srpvfile, NULL);
382 if (db == NULL) {
383 BIO_printf(bio_err, "Problem with index file: %s (could not load/parse file)\n", srpvfile);
384 goto end;
385 }
386
387 /* Lets check some fields */
388 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
389 pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
390
391 if (pp[DB_srptype][0] == DB_SRP_INDEX) {
392 maxgN = i;
393 if ((gNindex < 0) && (gN != NULL) && strcmp(gN, pp[DB_srpid]) == 0)
394 gNindex = i;
395
396 print_index(db, i, verbose > 1);
397 }
398 }
399
400 if (verbose)
401 BIO_printf(bio_err, "Database initialised\n");
402
403 if (gNindex >= 0) {
404 gNrow = sk_OPENSSL_PSTRING_value(db->db->data, gNindex);
405 print_entry(db, gNindex, verbose > 1, "Default g and N");
406 } else if (maxgN > 0 && !SRP_get_default_gN(gN)) {
407 BIO_printf(bio_err, "No g and N value for index \"%s\"\n", gN);
408 goto end;
409 } else {
410 if (verbose)
411 BIO_printf(bio_err, "Database has no g N information.\n");
412 gNrow = NULL;
413 }
414
415 if (verbose > 1)
416 BIO_printf(bio_err, "Starting user processing\n");
417
418 while (mode == OPT_LIST || user != NULL) {
419 int userindex = -1;
420
421 if (user != NULL && verbose > 1)
422 BIO_printf(bio_err, "Processing user \"%s\"\n", user);
423 if ((userindex = get_index(db, user, 'U')) >= 0)
424 print_user(db, userindex, (verbose > 0) || mode == OPT_LIST);
425
426 if (mode == OPT_LIST) {
427 if (user == NULL) {
428 BIO_printf(bio_err, "List all users\n");
429
430 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++)
431 print_user(db, i, 1);
432 } else if (userindex < 0) {
433 BIO_printf(bio_err,
434 "user \"%s\" does not exist, ignored. t\n", user);
435 errors++;
436 }
437 } else if (mode == OPT_ADD) {
438 if (userindex >= 0) {
439 /* reactivation of a new user */
440 char **row =
441 sk_OPENSSL_PSTRING_value(db->db->data, userindex);
442 BIO_printf(bio_err, "user \"%s\" reactivated.\n", user);
443 row[DB_srptype][0] = 'V';
444
445 doupdatedb = 1;
446 } else {
447 char *row[DB_NUMBER];
448 char *gNid;
449 row[DB_srpverifier] = NULL;
450 row[DB_srpsalt] = NULL;
451 row[DB_srpinfo] = NULL;
452 if (!
453 (gNid =
454 srp_create_user(user, &(row[DB_srpverifier]),
455 &(row[DB_srpsalt]),
456 gNrow ? gNrow[DB_srpsalt] : gN,
457 gNrow ? gNrow[DB_srpverifier] : NULL,
458 passout, verbose))) {
459 BIO_printf(bio_err,
460 "Cannot create srp verifier for user \"%s\", operation abandoned .\n",
461 user);
462 errors++;
463 goto end;
464 }
465 row[DB_srpid] = OPENSSL_strdup(user);
466 row[DB_srptype] = OPENSSL_strdup("v");
467 row[DB_srpgN] = OPENSSL_strdup(gNid);
468
469 if ((row[DB_srpid] == NULL)
470 || (row[DB_srpgN] == NULL)
471 || (row[DB_srptype] == NULL)
472 || (row[DB_srpverifier] == NULL)
473 || (row[DB_srpsalt] == NULL)
474 || (userinfo
475 && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo)) == NULL))
476 || !update_index(db, row)) {
477 OPENSSL_free(row[DB_srpid]);
478 OPENSSL_free(row[DB_srpgN]);
479 OPENSSL_free(row[DB_srpinfo]);
480 OPENSSL_free(row[DB_srptype]);
481 OPENSSL_free(row[DB_srpverifier]);
482 OPENSSL_free(row[DB_srpsalt]);
483 goto end;
484 }
485 doupdatedb = 1;
486 }
487 } else if (mode == OPT_MODIFY) {
488 if (userindex < 0) {
489 BIO_printf(bio_err,
490 "user \"%s\" does not exist, operation ignored.\n",
491 user);
492 errors++;
493 } else {
494
495 char **row =
496 sk_OPENSSL_PSTRING_value(db->db->data, userindex);
497 char type = row[DB_srptype][0];
498 if (type == 'v') {
499 BIO_printf(bio_err,
500 "user \"%s\" already updated, operation ignored.\n",
501 user);
502 errors++;
503 } else {
504 char *gNid;
505
506 if (row[DB_srptype][0] == 'V') {
507 int user_gN;
508 char **irow = NULL;
509 if (verbose)
510 BIO_printf(bio_err,
511 "Verifying password for user \"%s\"\n",
512 user);
513 if ((user_gN =
514 get_index(db, row[DB_srpgN], DB_SRP_INDEX)) >= 0)
515 irow =
516 sk_OPENSSL_PSTRING_value(db->db->data,
517 userindex);
518
519 if (!srp_verify_user
520 (user, row[DB_srpverifier], row[DB_srpsalt],
521 irow ? irow[DB_srpsalt] : row[DB_srpgN],
522 irow ? irow[DB_srpverifier] : NULL, passin,
523 verbose)) {
524 BIO_printf(bio_err,
525 "Invalid password for user \"%s\", operation abandoned.\n",
526 user);
527 errors++;
528 goto end;
529 }
530 }
531 if (verbose)
532 BIO_printf(bio_err, "Password for user \"%s\" ok.\n",
533 user);
534
535 if (!
536 (gNid =
537 srp_create_user(user, &(row[DB_srpverifier]),
538 &(row[DB_srpsalt]),
539 gNrow ? gNrow[DB_srpsalt] : NULL,
540 gNrow ? gNrow[DB_srpverifier] : NULL,
541 passout, verbose))) {
542 BIO_printf(bio_err,
543 "Cannot create srp verifier for user \"%s\", operation abandoned.\n",
544 user);
545 errors++;
546 goto end;
547 }
548
549 row[DB_srptype][0] = 'v';
550 row[DB_srpgN] = OPENSSL_strdup(gNid);
551
552 if (row[DB_srpid] == NULL
553 || row[DB_srpgN] == NULL
554 || row[DB_srptype] == NULL
555 || row[DB_srpverifier] == NULL
556 || row[DB_srpsalt] == NULL
557 || (userinfo
558 && ((row[DB_srpinfo] = OPENSSL_strdup(userinfo))
559 == NULL)))
560 goto end;
561
562 doupdatedb = 1;
563 }
564 }
565 } else if (mode == OPT_DELETE) {
566 if (userindex < 0) {
567 BIO_printf(bio_err,
568 "user \"%s\" does not exist, operation ignored. t\n",
569 user);
570 errors++;
571 } else {
572 char **xpp = sk_OPENSSL_PSTRING_value(db->db->data, userindex);
573
574 BIO_printf(bio_err, "user \"%s\" revoked. t\n", user);
575 xpp[DB_srptype][0] = 'R';
576 doupdatedb = 1;
577 }
578 }
579 user = *argv++;
580 if (user == NULL) {
581 /* no more processing in any mode if no users left */
582 break;
583 }
584 }
585
586 if (verbose)
587 BIO_printf(bio_err, "User procession done.\n");
588
589 if (doupdatedb) {
590 /* Lets check some fields */
591 for (i = 0; i < sk_OPENSSL_PSTRING_num(db->db->data); i++) {
592 pp = sk_OPENSSL_PSTRING_value(db->db->data, i);
593
594 if (pp[DB_srptype][0] == 'v') {
595 pp[DB_srptype][0] = 'V';
596 print_user(db, i, verbose);
597 }
598 }
599
600 if (verbose)
601 BIO_printf(bio_err, "Trying to update srpvfile.\n");
602 if (!save_index(srpvfile, "new", db))
603 goto end;
604
605 if (verbose)
606 BIO_printf(bio_err, "Temporary srpvfile created.\n");
607 if (!rotate_index(srpvfile, "new", "old"))
608 goto end;
609
610 if (verbose)
611 BIO_printf(bio_err, "srpvfile updated.\n");
612 }
613
614 ret = (errors != 0);
615 end:
616 if (errors != 0)
617 if (verbose)
618 BIO_printf(bio_err, "User errors %d.\n", errors);
619
620 if (verbose)
621 BIO_printf(bio_err, "SRP terminating with code %d.\n", ret);
622
623 OPENSSL_free(passin);
624 OPENSSL_free(passout);
625 if (ret)
626 ERR_print_errors(bio_err);
627 NCONF_free(conf);
628 free_index(db);
629 release_engine(e);
630 return ret;
631 }
632