2 * Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2004, EdelKey Project. All Rights Reserved.
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
10 * Originally written by Christophe Renou and Peter Sylvester,
11 * for the EdelKey project.
15 * We need to use the SRP deprecated APIs in order to implement the SSL SRP
16 * APIs - which are themselves deprecated.
18 #define OPENSSL_SUPPRESS_DEPRECATED
20 #include <openssl/crypto.h>
21 #include <openssl/rand.h>
22 #include <openssl/err.h>
23 #include "ssl_local.h"
25 #ifndef OPENSSL_NO_SRP
26 # include <openssl/srp.h>
29 * The public API SSL_CTX_SRP_CTX_free() is deprecated so we use
30 * ssl_ctx_srp_ctx_free_intern() internally.
32 int ssl_ctx_srp_ctx_free_intern(SSL_CTX *ctx)
36 OPENSSL_free(ctx->srp_ctx.login);
37 OPENSSL_free(ctx->srp_ctx.info);
38 BN_free(ctx->srp_ctx.N);
39 BN_free(ctx->srp_ctx.g);
40 BN_free(ctx->srp_ctx.s);
41 BN_free(ctx->srp_ctx.B);
42 BN_free(ctx->srp_ctx.A);
43 BN_free(ctx->srp_ctx.a);
44 BN_free(ctx->srp_ctx.b);
45 BN_free(ctx->srp_ctx.v);
46 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
47 ctx->srp_ctx.strength = SRP_MINIMAL_N;
51 int SSL_CTX_SRP_CTX_free(SSL_CTX *ctx)
53 return ssl_ctx_srp_ctx_free_intern(ctx);
57 * The public API SSL_SRP_CTX_free() is deprecated so we use
58 * ssl_srp_ctx_free_intern() internally.
60 int ssl_srp_ctx_free_intern(SSL *s)
64 OPENSSL_free(s->srp_ctx.login);
65 OPENSSL_free(s->srp_ctx.info);
66 BN_free(s->srp_ctx.N);
67 BN_free(s->srp_ctx.g);
68 BN_free(s->srp_ctx.s);
69 BN_free(s->srp_ctx.B);
70 BN_free(s->srp_ctx.A);
71 BN_free(s->srp_ctx.a);
72 BN_free(s->srp_ctx.b);
73 BN_free(s->srp_ctx.v);
74 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
75 s->srp_ctx.strength = SRP_MINIMAL_N;
79 int SSL_SRP_CTX_free(SSL *s)
81 return ssl_srp_ctx_free_intern(s);
85 * The public API SSL_SRP_CTX_init() is deprecated so we use
86 * ssl_srp_ctx_init_intern() internally.
88 int ssl_srp_ctx_init_intern(SSL *s)
92 if ((s == NULL) || ((ctx = s->ctx) == NULL))
95 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
97 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
98 /* set client Hello login callback */
99 s->srp_ctx.TLS_ext_srp_username_callback =
100 ctx->srp_ctx.TLS_ext_srp_username_callback;
101 /* set SRP N/g param callback for verification */
102 s->srp_ctx.SRP_verify_param_callback =
103 ctx->srp_ctx.SRP_verify_param_callback;
104 /* set SRP client passwd callback */
105 s->srp_ctx.SRP_give_srp_client_pwd_callback =
106 ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
108 s->srp_ctx.strength = ctx->srp_ctx.strength;
110 if (((ctx->srp_ctx.N != NULL) &&
111 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
112 ((ctx->srp_ctx.g != NULL) &&
113 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
114 ((ctx->srp_ctx.s != NULL) &&
115 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
116 ((ctx->srp_ctx.B != NULL) &&
117 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
118 ((ctx->srp_ctx.A != NULL) &&
119 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
120 ((ctx->srp_ctx.a != NULL) &&
121 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
122 ((ctx->srp_ctx.v != NULL) &&
123 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
124 ((ctx->srp_ctx.b != NULL) &&
125 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
126 ERR_raise(ERR_LIB_SSL, ERR_R_BN_LIB);
129 if ((ctx->srp_ctx.login != NULL) &&
130 ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
131 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
134 if ((ctx->srp_ctx.info != NULL) &&
135 ((s->srp_ctx.info = OPENSSL_strdup(ctx->srp_ctx.info)) == NULL)) {
136 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
139 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
143 OPENSSL_free(s->srp_ctx.login);
144 OPENSSL_free(s->srp_ctx.info);
145 BN_free(s->srp_ctx.N);
146 BN_free(s->srp_ctx.g);
147 BN_free(s->srp_ctx.s);
148 BN_free(s->srp_ctx.B);
149 BN_free(s->srp_ctx.A);
150 BN_free(s->srp_ctx.a);
151 BN_free(s->srp_ctx.b);
152 BN_free(s->srp_ctx.v);
153 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
157 int SSL_SRP_CTX_init(SSL *s)
159 return ssl_srp_ctx_init_intern(s);
163 * The public API SSL_CTX_SRP_CTX_init() is deprecated so we use
164 * ssl_ctx_srp_ctx_init_intern() internally.
166 int ssl_ctx_srp_ctx_init_intern(SSL_CTX *ctx)
171 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
172 ctx->srp_ctx.strength = SRP_MINIMAL_N;
177 int SSL_CTX_SRP_CTX_init(SSL_CTX *ctx)
179 return ssl_ctx_srp_ctx_init_intern(ctx);
184 * The public API SSL_srp_server_param_with_username() is deprecated so we use
185 * ssl_srp_server_param_with_username_intern() internally.
187 int ssl_srp_server_param_with_username_intern(SSL *s, int *ad)
189 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
192 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
193 if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
195 s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
196 s->srp_ctx.SRP_cb_arg)) !=
200 *ad = SSL_AD_INTERNAL_ERROR;
201 if ((s->srp_ctx.N == NULL) ||
202 (s->srp_ctx.g == NULL) ||
203 (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
204 return SSL3_AL_FATAL;
206 if (RAND_priv_bytes_ex(s->ctx->libctx, b, sizeof(b), 0) <= 0)
207 return SSL3_AL_FATAL;
208 s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
209 OPENSSL_cleanse(b, sizeof(b));
211 /* Calculate: B = (kv + g^b) % N */
213 return ((s->srp_ctx.B =
214 SRP_Calc_B_ex(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
215 s->srp_ctx.v, s->ctx->libctx, s->ctx->propq)) !=
216 NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
219 int SSL_srp_server_param_with_username(SSL *s, int *ad)
221 return ssl_srp_server_param_with_username_intern(s, ad);
225 * If the server just has the raw password, make up a verifier entry on the
228 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
231 SRP_gN *GN = SRP_get_default_gN(grp);
234 s->srp_ctx.N = BN_dup(GN->N);
235 s->srp_ctx.g = BN_dup(GN->g);
236 BN_clear_free(s->srp_ctx.v);
238 BN_clear_free(s->srp_ctx.s);
240 if (!SRP_create_verifier_BN_ex(user, pass, &s->srp_ctx.s, &s->srp_ctx.v,
241 GN->N, GN->g, s->ctx->libctx,
248 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
249 BIGNUM *sa, BIGNUM *v, char *info)
252 if (s->srp_ctx.N != NULL) {
253 if (!BN_copy(s->srp_ctx.N, N)) {
254 BN_free(s->srp_ctx.N);
258 s->srp_ctx.N = BN_dup(N);
261 if (s->srp_ctx.g != NULL) {
262 if (!BN_copy(s->srp_ctx.g, g)) {
263 BN_free(s->srp_ctx.g);
267 s->srp_ctx.g = BN_dup(g);
270 if (s->srp_ctx.s != NULL) {
271 if (!BN_copy(s->srp_ctx.s, sa)) {
272 BN_free(s->srp_ctx.s);
276 s->srp_ctx.s = BN_dup(sa);
279 if (s->srp_ctx.v != NULL) {
280 if (!BN_copy(s->srp_ctx.v, v)) {
281 BN_free(s->srp_ctx.v);
285 s->srp_ctx.v = BN_dup(v);
289 OPENSSL_free(s->srp_ctx.info);
290 if ((s->srp_ctx.info = OPENSSL_strdup(info)) == NULL)
294 if (!(s->srp_ctx.N) ||
295 !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v))
301 int srp_generate_server_master_secret(SSL *s)
303 BIGNUM *K = NULL, *u = NULL;
304 int ret = -1, tmp_len = 0;
305 unsigned char *tmp = NULL;
307 if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
309 if ((u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
310 s->ctx->libctx, s->ctx->propq)) == NULL)
312 if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
313 s->srp_ctx.N)) == NULL)
316 tmp_len = BN_num_bytes(K);
317 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
318 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
322 /* Calls SSLfatal() as required */
323 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
331 int srp_generate_client_master_secret(SSL *s)
333 BIGNUM *x = NULL, *u = NULL, *K = NULL;
334 int ret = -1, tmp_len = 0;
336 unsigned char *tmp = NULL;
339 * Checks if b % n == 0
341 if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0
342 || (u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
343 s->ctx->libctx, s->ctx->propq))
345 || s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) {
346 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
349 if ((passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s,
350 s->srp_ctx.SRP_cb_arg))
352 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CALLBACK_FAILED);
355 if ((x = SRP_Calc_x_ex(s->srp_ctx.s, s->srp_ctx.login, passwd,
356 s->ctx->libctx, s->ctx->propq)) == NULL
357 || (K = SRP_Calc_client_key_ex(s->srp_ctx.N, s->srp_ctx.B,
361 s->ctx->propq)) == NULL) {
362 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
366 tmp_len = BN_num_bytes(K);
367 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
368 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
372 /* Calls SSLfatal() as required */
373 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
378 OPENSSL_clear_free(passwd, strlen(passwd));
383 int srp_verify_server_param(SSL *s)
385 SRP_CTX *srp = &s->srp_ctx;
387 * Sanity check parameters: we can quickly check B % N == 0 by checking B
390 if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
391 || BN_is_zero(srp->B)) {
392 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_DATA);
396 if (BN_num_bits(srp->N) < srp->strength) {
397 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_INSUFFICIENT_SECURITY);
401 if (srp->SRP_verify_param_callback) {
402 if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
403 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_CALLBACK_FAILED);
406 } else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
407 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY,
408 SSL_R_INSUFFICIENT_SECURITY);
416 * The public API SRP_Calc_A_param() is deprecated so we use
417 * ssl_srp_calc_a_param_intern() internally.
419 int ssl_srp_calc_a_param_intern(SSL *s)
421 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
423 if (RAND_priv_bytes_ex(s->ctx->libctx, rnd, sizeof(rnd), 0) <= 0)
425 s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
426 OPENSSL_cleanse(rnd, sizeof(rnd));
428 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
434 int SRP_Calc_A_param(SSL *s)
436 return ssl_srp_calc_a_param_intern(s);
439 BIGNUM *SSL_get_srp_g(SSL *s)
441 if (s->srp_ctx.g != NULL)
443 return s->ctx->srp_ctx.g;
446 BIGNUM *SSL_get_srp_N(SSL *s)
448 if (s->srp_ctx.N != NULL)
450 return s->ctx->srp_ctx.N;
453 char *SSL_get_srp_username(SSL *s)
455 if (s->srp_ctx.login != NULL)
456 return s->srp_ctx.login;
457 return s->ctx->srp_ctx.login;
460 char *SSL_get_srp_userinfo(SSL *s)
462 if (s->srp_ctx.info != NULL)
463 return s->srp_ctx.info;
464 return s->ctx->srp_ctx.info;
467 # define tls1_ctx_ctrl ssl3_ctx_ctrl
468 # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
470 int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
472 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
475 int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
477 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
480 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
482 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
486 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
487 int (*cb) (SSL *, void *))
489 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
493 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
495 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
498 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
499 int (*cb) (SSL *, int *, void *))
501 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
505 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
506 char *(*cb) (SSL *, void *))
508 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,