2 * Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/crypto.h>
11 #include <openssl/rand.h>
12 #include <openssl/err.h>
15 #ifndef OPENSSL_NO_SRP
16 # include <openssl/srp.h>
18 int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx)
22 OPENSSL_free(ctx->srp_ctx.login);
23 OPENSSL_free(ctx->srp_ctx.info);
24 BN_free(ctx->srp_ctx.N);
25 BN_free(ctx->srp_ctx.g);
26 BN_free(ctx->srp_ctx.s);
27 BN_free(ctx->srp_ctx.B);
28 BN_free(ctx->srp_ctx.A);
29 BN_free(ctx->srp_ctx.a);
30 BN_free(ctx->srp_ctx.b);
31 BN_free(ctx->srp_ctx.v);
32 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
33 ctx->srp_ctx.strength = SRP_MINIMAL_N;
37 int SSL_SRP_CTX_free(struct ssl_st *s)
41 OPENSSL_free(s->srp_ctx.login);
42 OPENSSL_free(s->srp_ctx.info);
43 BN_free(s->srp_ctx.N);
44 BN_free(s->srp_ctx.g);
45 BN_free(s->srp_ctx.s);
46 BN_free(s->srp_ctx.B);
47 BN_free(s->srp_ctx.A);
48 BN_free(s->srp_ctx.a);
49 BN_free(s->srp_ctx.b);
50 BN_free(s->srp_ctx.v);
51 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
52 s->srp_ctx.strength = SRP_MINIMAL_N;
56 int SSL_SRP_CTX_init(struct ssl_st *s)
60 if ((s == NULL) || ((ctx = s->ctx) == NULL))
63 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
65 s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
66 /* set client Hello login callback */
67 s->srp_ctx.TLS_ext_srp_username_callback =
68 ctx->srp_ctx.TLS_ext_srp_username_callback;
69 /* set SRP N/g param callback for verification */
70 s->srp_ctx.SRP_verify_param_callback =
71 ctx->srp_ctx.SRP_verify_param_callback;
72 /* set SRP client passwd callback */
73 s->srp_ctx.SRP_give_srp_client_pwd_callback =
74 ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
76 s->srp_ctx.strength = ctx->srp_ctx.strength;
78 if (((ctx->srp_ctx.N != NULL) &&
79 ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
80 ((ctx->srp_ctx.g != NULL) &&
81 ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
82 ((ctx->srp_ctx.s != NULL) &&
83 ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
84 ((ctx->srp_ctx.B != NULL) &&
85 ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
86 ((ctx->srp_ctx.A != NULL) &&
87 ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
88 ((ctx->srp_ctx.a != NULL) &&
89 ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
90 ((ctx->srp_ctx.v != NULL) &&
91 ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
92 ((ctx->srp_ctx.b != NULL) &&
93 ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) {
94 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_BN_LIB);
97 if ((ctx->srp_ctx.login != NULL) &&
98 ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) {
99 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR);
102 if ((ctx->srp_ctx.info != NULL) &&
103 ((s->srp_ctx.info = BUF_strdup(ctx->srp_ctx.info)) == NULL)) {
104 SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR);
107 s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
111 OPENSSL_free(s->srp_ctx.login);
112 OPENSSL_free(s->srp_ctx.info);
113 BN_free(s->srp_ctx.N);
114 BN_free(s->srp_ctx.g);
115 BN_free(s->srp_ctx.s);
116 BN_free(s->srp_ctx.B);
117 BN_free(s->srp_ctx.A);
118 BN_free(s->srp_ctx.a);
119 BN_free(s->srp_ctx.b);
120 BN_free(s->srp_ctx.v);
121 memset(&s->srp_ctx, 0, sizeof(s->srp_ctx));
125 int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
130 memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx));
131 ctx->srp_ctx.strength = SRP_MINIMAL_N;
137 int SSL_srp_server_param_with_username(SSL *s, int *ad)
139 unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
142 *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
143 if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) &&
145 s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
146 s->srp_ctx.SRP_cb_arg)) !=
150 *ad = SSL_AD_INTERNAL_ERROR;
151 if ((s->srp_ctx.N == NULL) ||
152 (s->srp_ctx.g == NULL) ||
153 (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL))
154 return SSL3_AL_FATAL;
156 if (ssl_randbytes(s, b, sizeof(b)) <= 0)
157 return SSL3_AL_FATAL;
158 s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL);
159 OPENSSL_cleanse(b, sizeof(b));
161 /* Calculate: B = (kv + g^b) % N */
163 return ((s->srp_ctx.B =
164 SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
166 NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
170 * If the server just has the raw password, make up a verifier entry on the
173 int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
176 SRP_gN *GN = SRP_get_default_gN(grp);
179 s->srp_ctx.N = BN_dup(GN->N);
180 s->srp_ctx.g = BN_dup(GN->g);
181 BN_clear_free(s->srp_ctx.v);
183 BN_clear_free(s->srp_ctx.s);
185 if (!SRP_create_verifier_BN
186 (user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g))
192 int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
193 BIGNUM *sa, BIGNUM *v, char *info)
196 if (s->srp_ctx.N != NULL) {
197 if (!BN_copy(s->srp_ctx.N, N)) {
198 BN_free(s->srp_ctx.N);
202 s->srp_ctx.N = BN_dup(N);
205 if (s->srp_ctx.g != NULL) {
206 if (!BN_copy(s->srp_ctx.g, g)) {
207 BN_free(s->srp_ctx.g);
211 s->srp_ctx.g = BN_dup(g);
214 if (s->srp_ctx.s != NULL) {
215 if (!BN_copy(s->srp_ctx.s, sa)) {
216 BN_free(s->srp_ctx.s);
220 s->srp_ctx.s = BN_dup(sa);
223 if (s->srp_ctx.v != NULL) {
224 if (!BN_copy(s->srp_ctx.v, v)) {
225 BN_free(s->srp_ctx.v);
229 s->srp_ctx.v = BN_dup(v);
233 OPENSSL_free(s->srp_ctx.info);
234 if ((s->srp_ctx.info = BUF_strdup(info)) == NULL)
238 if (!(s->srp_ctx.N) ||
239 !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v))
245 int srp_generate_server_master_secret(SSL *s)
247 BIGNUM *K = NULL, *u = NULL;
248 int ret = -1, tmp_len = 0;
249 unsigned char *tmp = NULL;
251 if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N))
253 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
255 if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
256 s->srp_ctx.N)) == NULL)
259 tmp_len = BN_num_bytes(K);
260 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) {
261 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
262 SSL_F_SRP_GENERATE_SERVER_MASTER_SECRET, ERR_R_MALLOC_FAILURE);
266 /* Calls SSLfatal() as required */
267 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
275 int srp_generate_client_master_secret(SSL *s)
277 BIGNUM *x = NULL, *u = NULL, *K = NULL;
278 int ret = -1, tmp_len = 0;
280 unsigned char *tmp = NULL;
283 * Checks if b % n == 0
285 if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0)
287 if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL)
289 if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL)
293 s->srp_ctx.SRP_give_srp_client_pwd_callback(s, s->srp_ctx.SRP_cb_arg)))
295 if ((x = SRP_Calc_x(s->srp_ctx.s, s->srp_ctx.login, passwd)) == NULL)
297 if ((K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x,
298 s->srp_ctx.a, u)) == NULL)
301 tmp_len = BN_num_bytes(K);
302 if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
305 ret = ssl_generate_master_secret(s, tmp, tmp_len, 1);
310 OPENSSL_clear_free(passwd, strlen(passwd));
315 int srp_verify_server_param(SSL *s, int *al)
317 SRP_CTX *srp = &s->srp_ctx;
319 * Sanity check parameters: we can quickly check B % N == 0 by checking B
322 if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0
323 || BN_is_zero(srp->B)) {
324 *al = SSL3_AD_ILLEGAL_PARAMETER;
328 if (BN_num_bits(srp->N) < srp->strength) {
329 *al = TLS1_AD_INSUFFICIENT_SECURITY;
333 if (srp->SRP_verify_param_callback) {
334 if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
335 *al = TLS1_AD_INSUFFICIENT_SECURITY;
338 } else if (!SRP_check_known_gN_param(srp->g, srp->N)) {
339 *al = TLS1_AD_INSUFFICIENT_SECURITY;
346 int SRP_Calc_A_param(SSL *s)
348 unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
350 if (ssl_randbytes(s, rnd, sizeof(rnd)) <= 0)
352 s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
353 OPENSSL_cleanse(rnd, sizeof(rnd));
355 if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g)))
361 BIGNUM *SSL_get_srp_g(SSL *s)
363 if (s->srp_ctx.g != NULL)
365 return s->ctx->srp_ctx.g;
368 BIGNUM *SSL_get_srp_N(SSL *s)
370 if (s->srp_ctx.N != NULL)
372 return s->ctx->srp_ctx.N;
375 char *SSL_get_srp_username(SSL *s)
377 if (s->srp_ctx.login != NULL)
378 return s->srp_ctx.login;
379 return s->ctx->srp_ctx.login;
382 char *SSL_get_srp_userinfo(SSL *s)
384 if (s->srp_ctx.info != NULL)
385 return s->srp_ctx.info;
386 return s->ctx->srp_ctx.info;
389 # define tls1_ctx_ctrl ssl3_ctx_ctrl
390 # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
392 int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name)
394 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name);
397 int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password)
399 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password);
402 int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
404 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
408 int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx,
409 int (*cb) (SSL *, void *))
411 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
415 int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
417 return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg);
420 int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
421 int (*cb) (SSL *, int *, void *))
423 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
427 int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx,
428 char *(*cb) (SSL *, void *))
430 return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,