2 * Copyright 2004-2020 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.
14 #include <openssl/crypto.h>
15 #include <openssl/rand.h>
16 #include <openssl/err.h>
17 #include "ssl_local.h"
19 #ifndef OPENSSL_NO_SRP
20 # include <openssl/srp.h>
22 int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx)
26 OPENSSL_free(ctx->srp_ctx.login);
27 OPENSSL_free(ctx->srp_ctx.info);
28 BN_free(ctx->srp_ctx.N);
29 BN_free(ctx->srp_ctx.g);
30 BN_free(ctx->srp_ctx.s);
31 BN_free(ctx->srp_ctx.B);
32 BN_free(ctx->srp_ctx.A);
33 BN_free(ctx->srp_ctx.a);
34 BN_free(ctx->srp_ctx.b);
35 BN_free(ctx->srp_ctx.v);
36 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
37 ctx->srp_ctx.strength = SRP_MINIMAL_N;
41 int SSL_SRP_CTX_free(struct ssl_st *s)
45 OPENSSL_free(s->srp_ctx.login);
46 OPENSSL_free(s->srp_ctx.info);
47 BN_free(s->srp_ctx.N);
48 BN_free(s->srp_ctx.g);
49 BN_free(s->srp_ctx.s);
50 BN_free(s->srp_ctx.B);
51 BN_free(s->srp_ctx.A);
52 BN_free(s->srp_ctx.a);
53 BN_free(s->srp_ctx.b);
54 BN_free(s->srp_ctx.v);
55 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
56 s->srp_ctx.strength = SRP_MINIMAL_N;
60 int SSL_SRP_CTX_init(struct ssl_st *s)
64 if ((s == NULL) || ((ctx = s->ctx) == NULL))
67 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
69 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
70 /* set client Hello login callback */
71 s->srp_ctx.TLS_ext_srp_username_callback =
72 ctx->srp_ctx.TLS_ext_srp_username_callback;
73 /* set SRP N/g param callback for verification */
74 s->srp_ctx.SRP_verify_param_callback =
75 ctx->srp_ctx.SRP_verify_param_callback;
76 /* set SRP client passwd callback */
77 s->srp_ctx.SRP_give_srp_client_pwd_callback =
78 ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
80 s->srp_ctx.strength = ctx->srp_ctx.strength;
82 if (((ctx->srp_ctx.N != NULL) &&
83 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
84 ((ctx->srp_ctx.g != NULL) &&
85 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
86 ((ctx->srp_ctx.s != NULL) &&
87 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
88 ((ctx->srp_ctx.B != NULL) &&
89 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
90 ((ctx->srp_ctx.A != NULL) &&
91 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
92 ((ctx->srp_ctx.a != NULL) &&
93 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
94 ((ctx->srp_ctx.v != NULL) &&
95 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
96 ((ctx->srp_ctx.b != NULL) &&
97 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
98 ERR_raise(ERR_LIB_SSL, ERR_R_BN_LIB);
101 if ((ctx->srp_ctx.login != NULL) &&
102 ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
103 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
106 if ((ctx->srp_ctx.info != NULL) &&
107 ((s->srp_ctx.info = OPENSSL_strdup(ctx->srp_ctx.info)) == NULL)) {
108 ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
111 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
115 OPENSSL_free(s->srp_ctx.login);
116 OPENSSL_free(s->srp_ctx.info);
117 BN_free(s->srp_ctx.N);
118 BN_free(s->srp_ctx.g);
119 BN_free(s->srp_ctx.s);
120 BN_free(s->srp_ctx.B);
121 BN_free(s->srp_ctx.A);
122 BN_free(s->srp_ctx.a);
123 BN_free(s->srp_ctx.b);
124 BN_free(s->srp_ctx.v);
125 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
129 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
134 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
135 ctx->srp_ctx.strength = SRP_MINIMAL_N;
141 int SSL_srp_server_param_with_username(SSL *s, int *ad)
143 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
146 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
147 if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
149 s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
150 s->srp_ctx.SRP_cb_arg)) !=
154 *ad = SSL_AD_INTERNAL_ERROR;
155 if ((s->srp_ctx.N == NULL) ||
156 (s->srp_ctx.g == NULL) ||
157 (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
158 return SSL3_AL_FATAL;
160 if (RAND_priv_bytes_ex(s->ctx->libctx, b, sizeof(b)) <= 0)
161 return SSL3_AL_FATAL;
162 s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
163 OPENSSL_cleanse(b, sizeof(b));
165 /* Calculate: B = (kv + g^b) % N */
167 return ((s->srp_ctx.B =
168 SRP_Calc_B_ex(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
169 s->srp_ctx.v, s->ctx->libctx, s->ctx->propq)) !=
170 NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
174 * If the server just has the raw password, make up a verifier entry on the
177 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
180 SRP_gN *GN = SRP_get_default_gN(grp);
183 s->srp_ctx.N = BN_dup(GN->N);
184 s->srp_ctx.g = BN_dup(GN->g);
185 BN_clear_free(s->srp_ctx.v);
187 BN_clear_free(s->srp_ctx.s);
189 if (!SRP_create_verifier_BN_ex(user, pass, &s->srp_ctx.s, &s->srp_ctx.v,
190 GN->N, GN->g, s->ctx->libctx,
197 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
198 BIGNUM *sa, BIGNUM *v, char *info)
201 if (s->srp_ctx.N != NULL) {
202 if (!BN_copy(s->srp_ctx.N, N)) {
203 BN_free(s->srp_ctx.N);
207 s->srp_ctx.N = BN_dup(N);
210 if (s->srp_ctx.g != NULL) {
211 if (!BN_copy(s->srp_ctx.g, g)) {
212 BN_free(s->srp_ctx.g);
216 s->srp_ctx.g = BN_dup(g);
219 if (s->srp_ctx.s != NULL) {
220 if (!BN_copy(s->srp_ctx.s, sa)) {
221 BN_free(s->srp_ctx.s);
225 s->srp_ctx.s = BN_dup(sa);
228 if (s->srp_ctx.v != NULL) {
229 if (!BN_copy(s->srp_ctx.v, v)) {
230 BN_free(s->srp_ctx.v);
234 s->srp_ctx.v = BN_dup(v);
238 OPENSSL_free(s->srp_ctx.info);
239 if ((s->srp_ctx.info = OPENSSL_strdup(info)) == NULL)
243 if (!(s->srp_ctx.N) ||
244 !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v))
250 int srp_generate_server_master_secret(SSL *s)
252 BIGNUM *K = NULL, *u = NULL;
253 int ret = -1, tmp_len = 0;
254 unsigned char *tmp = NULL;
256 if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
258 if ((u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
259 s->ctx->libctx, s->ctx->propq)) == NULL)
261 if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
262 s->srp_ctx.N)) == NULL)
265 tmp_len = BN_num_bytes(K);
266 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
267 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
271 /* Calls SSLfatal() as required */
272 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
280 int srp_generate_client_master_secret(SSL *s)
282 BIGNUM *x = NULL, *u = NULL, *K = NULL;
283 int ret = -1, tmp_len = 0;
285 unsigned char *tmp = NULL;
288 * Checks if b % n == 0
290 if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0
291 || (u = SRP_Calc_u_ex(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N,
292 s->ctx->libctx, s->ctx->propq))
294 || s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) {
295 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
298 if ((passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s,
299 s->srp_ctx.SRP_cb_arg))
301 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_CALLBACK_FAILED);
304 if ((x = SRP_Calc_x_ex(s->srp_ctx.s, s->srp_ctx.login, passwd,
305 s->ctx->libctx, s->ctx->propq)) == NULL
306 || (K = SRP_Calc_client_key_ex(s->srp_ctx.N, s->srp_ctx.B,
310 s->ctx->propq)) == NULL) {
311 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
315 tmp_len = BN_num_bytes(K);
316 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
317 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
321 /* Calls SSLfatal() as required */
322 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
327 OPENSSL_clear_free(passwd, strlen(passwd));
332 int srp_verify_server_param(SSL *s)
334 SRP_CTX *srp = &s->srp_ctx;
336 * Sanity check parameters: we can quickly check B % N == 0 by checking B
339 if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
340 || BN_is_zero(srp->B)) {
341 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_DATA);
345 if (BN_num_bits(srp->N) < srp->strength) {
346 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_INSUFFICIENT_SECURITY);
350 if (srp->SRP_verify_param_callback) {
351 if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
352 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_R_CALLBACK_FAILED);
355 } else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
356 SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY,
357 SSL_R_INSUFFICIENT_SECURITY);
364 int SRP_Calc_A_param(SSL *s)
366 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
368 if (RAND_priv_bytes_ex(s->ctx->libctx, rnd, sizeof(rnd)) <= 0)
370 s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
371 OPENSSL_cleanse(rnd, sizeof(rnd));
373 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
379 BIGNUM *SSL_get_srp_g(SSL *s)
381 if (s->srp_ctx.g != NULL)
383 return s->ctx->srp_ctx.g;
386 BIGNUM *SSL_get_srp_N(SSL *s)
388 if (s->srp_ctx.N != NULL)
390 return s->ctx->srp_ctx.N;
393 char *SSL_get_srp_username(SSL *s)
395 if (s->srp_ctx.login != NULL)
396 return s->srp_ctx.login;
397 return s->ctx->srp_ctx.login;
400 char *SSL_get_srp_userinfo(SSL *s)
402 if (s->srp_ctx.info != NULL)
403 return s->srp_ctx.info;
404 return s->ctx->srp_ctx.info;
407 # define tls1_ctx_ctrl ssl3_ctx_ctrl
408 # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
410 int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
412 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
415 int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
417 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
420 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
422 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
426 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
427 int (*cb) (SSL *, void *))
429 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
433 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
435 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
438 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
439 int (*cb) (SSL *, int *, void *))
441 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
445 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
446 char *(*cb) (SSL *, void *))
448 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,