16f9291ceSJung-uk Kim /* 2*e71b7053SJung-uk Kim * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved. 3*e71b7053SJung-uk Kim * Copyright (c) 2004, EdelKey Project. All Rights Reserved. 4*e71b7053SJung-uk Kim * 5*e71b7053SJung-uk Kim * Licensed under the OpenSSL license (the "License"). You may not use 6*e71b7053SJung-uk Kim * this file except in compliance with the License. You can obtain a copy 7*e71b7053SJung-uk Kim * in the file LICENSE in the source distribution or at 8*e71b7053SJung-uk Kim * https://www.openssl.org/source/license.html 9*e71b7053SJung-uk Kim * 10*e71b7053SJung-uk Kim * Originally written by Christophe Renou and Peter Sylvester, 11*e71b7053SJung-uk Kim * for the EdelKey project. 121f13597dSJung-uk Kim */ 131f13597dSJung-uk Kim 14*e71b7053SJung-uk Kim #include <openssl/crypto.h> 151f13597dSJung-uk Kim #include <openssl/rand.h> 161f13597dSJung-uk Kim #include <openssl/err.h> 17*e71b7053SJung-uk Kim #include "ssl_locl.h" 18*e71b7053SJung-uk Kim 19*e71b7053SJung-uk Kim #ifndef OPENSSL_NO_SRP 20*e71b7053SJung-uk Kim # include <openssl/srp.h> 211f13597dSJung-uk Kim 221f13597dSJung-uk Kim int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx) 231f13597dSJung-uk Kim { 241f13597dSJung-uk Kim if (ctx == NULL) 251f13597dSJung-uk Kim return 0; 261f13597dSJung-uk Kim OPENSSL_free(ctx->srp_ctx.login); 27*e71b7053SJung-uk Kim OPENSSL_free(ctx->srp_ctx.info); 281f13597dSJung-uk Kim BN_free(ctx->srp_ctx.N); 291f13597dSJung-uk Kim BN_free(ctx->srp_ctx.g); 301f13597dSJung-uk Kim BN_free(ctx->srp_ctx.s); 311f13597dSJung-uk Kim BN_free(ctx->srp_ctx.B); 321f13597dSJung-uk Kim BN_free(ctx->srp_ctx.A); 331f13597dSJung-uk Kim BN_free(ctx->srp_ctx.a); 341f13597dSJung-uk Kim BN_free(ctx->srp_ctx.b); 351f13597dSJung-uk Kim BN_free(ctx->srp_ctx.v); 36*e71b7053SJung-uk Kim memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx)); 371f13597dSJung-uk Kim ctx->srp_ctx.strength = SRP_MINIMAL_N; 38*e71b7053SJung-uk Kim return 1; 391f13597dSJung-uk Kim } 401f13597dSJung-uk Kim 411f13597dSJung-uk Kim int SSL_SRP_CTX_free(struct ssl_st *s) 421f13597dSJung-uk Kim { 431f13597dSJung-uk Kim if (s == NULL) 441f13597dSJung-uk Kim return 0; 451f13597dSJung-uk Kim OPENSSL_free(s->srp_ctx.login); 46*e71b7053SJung-uk Kim OPENSSL_free(s->srp_ctx.info); 471f13597dSJung-uk Kim BN_free(s->srp_ctx.N); 481f13597dSJung-uk Kim BN_free(s->srp_ctx.g); 491f13597dSJung-uk Kim BN_free(s->srp_ctx.s); 501f13597dSJung-uk Kim BN_free(s->srp_ctx.B); 511f13597dSJung-uk Kim BN_free(s->srp_ctx.A); 521f13597dSJung-uk Kim BN_free(s->srp_ctx.a); 531f13597dSJung-uk Kim BN_free(s->srp_ctx.b); 541f13597dSJung-uk Kim BN_free(s->srp_ctx.v); 55*e71b7053SJung-uk Kim memset(&s->srp_ctx, 0, sizeof(s->srp_ctx)); 561f13597dSJung-uk Kim s->srp_ctx.strength = SRP_MINIMAL_N; 57*e71b7053SJung-uk Kim return 1; 581f13597dSJung-uk Kim } 591f13597dSJung-uk Kim 601f13597dSJung-uk Kim int SSL_SRP_CTX_init(struct ssl_st *s) 611f13597dSJung-uk Kim { 621f13597dSJung-uk Kim SSL_CTX *ctx; 631f13597dSJung-uk Kim 641f13597dSJung-uk Kim if ((s == NULL) || ((ctx = s->ctx) == NULL)) 651f13597dSJung-uk Kim return 0; 66*e71b7053SJung-uk Kim 67*e71b7053SJung-uk Kim memset(&s->srp_ctx, 0, sizeof(s->srp_ctx)); 68*e71b7053SJung-uk Kim 691f13597dSJung-uk Kim s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg; 701f13597dSJung-uk Kim /* set client Hello login callback */ 716f9291ceSJung-uk Kim s->srp_ctx.TLS_ext_srp_username_callback = 726f9291ceSJung-uk Kim ctx->srp_ctx.TLS_ext_srp_username_callback; 731f13597dSJung-uk Kim /* set SRP N/g param callback for verification */ 746f9291ceSJung-uk Kim s->srp_ctx.SRP_verify_param_callback = 756f9291ceSJung-uk Kim ctx->srp_ctx.SRP_verify_param_callback; 761f13597dSJung-uk Kim /* set SRP client passwd callback */ 776f9291ceSJung-uk Kim s->srp_ctx.SRP_give_srp_client_pwd_callback = 786f9291ceSJung-uk Kim ctx->srp_ctx.SRP_give_srp_client_pwd_callback; 791f13597dSJung-uk Kim 801f13597dSJung-uk Kim s->srp_ctx.strength = ctx->srp_ctx.strength; 811f13597dSJung-uk Kim 821f13597dSJung-uk Kim if (((ctx->srp_ctx.N != NULL) && 831f13597dSJung-uk Kim ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) || 841f13597dSJung-uk Kim ((ctx->srp_ctx.g != NULL) && 851f13597dSJung-uk Kim ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) || 861f13597dSJung-uk Kim ((ctx->srp_ctx.s != NULL) && 871f13597dSJung-uk Kim ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) || 881f13597dSJung-uk Kim ((ctx->srp_ctx.B != NULL) && 891f13597dSJung-uk Kim ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) || 901f13597dSJung-uk Kim ((ctx->srp_ctx.A != NULL) && 911f13597dSJung-uk Kim ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) || 921f13597dSJung-uk Kim ((ctx->srp_ctx.a != NULL) && 931f13597dSJung-uk Kim ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) || 941f13597dSJung-uk Kim ((ctx->srp_ctx.v != NULL) && 951f13597dSJung-uk Kim ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) || 961f13597dSJung-uk Kim ((ctx->srp_ctx.b != NULL) && 976f9291ceSJung-uk Kim ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL))) { 981f13597dSJung-uk Kim SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_BN_LIB); 991f13597dSJung-uk Kim goto err; 1001f13597dSJung-uk Kim } 1011f13597dSJung-uk Kim if ((ctx->srp_ctx.login != NULL) && 102*e71b7053SJung-uk Kim ((s->srp_ctx.login = OPENSSL_strdup(ctx->srp_ctx.login)) == NULL)) { 103*e71b7053SJung-uk Kim SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR); 104*e71b7053SJung-uk Kim goto err; 105*e71b7053SJung-uk Kim } 106*e71b7053SJung-uk Kim if ((ctx->srp_ctx.info != NULL) && 107*e71b7053SJung-uk Kim ((s->srp_ctx.info = BUF_strdup(ctx->srp_ctx.info)) == NULL)) { 1081f13597dSJung-uk Kim SSLerr(SSL_F_SSL_SRP_CTX_INIT, ERR_R_INTERNAL_ERROR); 1091f13597dSJung-uk Kim goto err; 1101f13597dSJung-uk Kim } 1111f13597dSJung-uk Kim s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask; 1121f13597dSJung-uk Kim 113*e71b7053SJung-uk Kim return 1; 1141f13597dSJung-uk Kim err: 1151f13597dSJung-uk Kim OPENSSL_free(s->srp_ctx.login); 116*e71b7053SJung-uk Kim OPENSSL_free(s->srp_ctx.info); 1171f13597dSJung-uk Kim BN_free(s->srp_ctx.N); 1181f13597dSJung-uk Kim BN_free(s->srp_ctx.g); 1191f13597dSJung-uk Kim BN_free(s->srp_ctx.s); 1201f13597dSJung-uk Kim BN_free(s->srp_ctx.B); 1211f13597dSJung-uk Kim BN_free(s->srp_ctx.A); 1221f13597dSJung-uk Kim BN_free(s->srp_ctx.a); 1231f13597dSJung-uk Kim BN_free(s->srp_ctx.b); 1241f13597dSJung-uk Kim BN_free(s->srp_ctx.v); 125*e71b7053SJung-uk Kim memset(&s->srp_ctx, 0, sizeof(s->srp_ctx)); 126*e71b7053SJung-uk Kim return 0; 1271f13597dSJung-uk Kim } 1281f13597dSJung-uk Kim 1291f13597dSJung-uk Kim int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx) 1301f13597dSJung-uk Kim { 1311f13597dSJung-uk Kim if (ctx == NULL) 1321f13597dSJung-uk Kim return 0; 1331f13597dSJung-uk Kim 134*e71b7053SJung-uk Kim memset(&ctx->srp_ctx, 0, sizeof(ctx->srp_ctx)); 1351f13597dSJung-uk Kim ctx->srp_ctx.strength = SRP_MINIMAL_N; 1361f13597dSJung-uk Kim 137*e71b7053SJung-uk Kim return 1; 1381f13597dSJung-uk Kim } 1391f13597dSJung-uk Kim 1401f13597dSJung-uk Kim /* server side */ 1411f13597dSJung-uk Kim int SSL_srp_server_param_with_username(SSL *s, int *ad) 1421f13597dSJung-uk Kim { 1431f13597dSJung-uk Kim unsigned char b[SSL_MAX_MASTER_KEY_LENGTH]; 1441f13597dSJung-uk Kim int al; 1451f13597dSJung-uk Kim 1461f13597dSJung-uk Kim *ad = SSL_AD_UNKNOWN_PSK_IDENTITY; 1471f13597dSJung-uk Kim if ((s->srp_ctx.TLS_ext_srp_username_callback != NULL) && 1486f9291ceSJung-uk Kim ((al = 1496f9291ceSJung-uk Kim s->srp_ctx.TLS_ext_srp_username_callback(s, ad, 1506f9291ceSJung-uk Kim s->srp_ctx.SRP_cb_arg)) != 1516f9291ceSJung-uk Kim SSL_ERROR_NONE)) 1521f13597dSJung-uk Kim return al; 1531f13597dSJung-uk Kim 1541f13597dSJung-uk Kim *ad = SSL_AD_INTERNAL_ERROR; 1551f13597dSJung-uk Kim if ((s->srp_ctx.N == NULL) || 1561f13597dSJung-uk Kim (s->srp_ctx.g == NULL) || 1576f9291ceSJung-uk Kim (s->srp_ctx.s == NULL) || (s->srp_ctx.v == NULL)) 1581f13597dSJung-uk Kim return SSL3_AL_FATAL; 1591f13597dSJung-uk Kim 160*e71b7053SJung-uk Kim if (RAND_priv_bytes(b, sizeof(b)) <= 0) 16109286989SJung-uk Kim return SSL3_AL_FATAL; 1621f13597dSJung-uk Kim s->srp_ctx.b = BN_bin2bn(b, sizeof(b), NULL); 1631f13597dSJung-uk Kim OPENSSL_cleanse(b, sizeof(b)); 1641f13597dSJung-uk Kim 1651f13597dSJung-uk Kim /* Calculate: B = (kv + g^b) % N */ 1661f13597dSJung-uk Kim 1676f9291ceSJung-uk Kim return ((s->srp_ctx.B = 1686f9291ceSJung-uk Kim SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g, 1696f9291ceSJung-uk Kim s->srp_ctx.v)) != 1706f9291ceSJung-uk Kim NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL; 1711f13597dSJung-uk Kim } 1721f13597dSJung-uk Kim 1736f9291ceSJung-uk Kim /* 1746f9291ceSJung-uk Kim * If the server just has the raw password, make up a verifier entry on the 1756f9291ceSJung-uk Kim * fly 1766f9291ceSJung-uk Kim */ 1776f9291ceSJung-uk Kim int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass, 1786f9291ceSJung-uk Kim const char *grp) 1791f13597dSJung-uk Kim { 1801f13597dSJung-uk Kim SRP_gN *GN = SRP_get_default_gN(grp); 1816f9291ceSJung-uk Kim if (GN == NULL) 1826f9291ceSJung-uk Kim return -1; 1831f13597dSJung-uk Kim s->srp_ctx.N = BN_dup(GN->N); 1841f13597dSJung-uk Kim s->srp_ctx.g = BN_dup(GN->g); 1851f13597dSJung-uk Kim BN_clear_free(s->srp_ctx.v); 1861f13597dSJung-uk Kim s->srp_ctx.v = NULL; 1871f13597dSJung-uk Kim BN_clear_free(s->srp_ctx.s); 1881f13597dSJung-uk Kim s->srp_ctx.s = NULL; 1896f9291ceSJung-uk Kim if (!SRP_create_verifier_BN 1906f9291ceSJung-uk Kim (user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g)) 1916f9291ceSJung-uk Kim return -1; 1921f13597dSJung-uk Kim 1931f13597dSJung-uk Kim return 1; 1941f13597dSJung-uk Kim } 1951f13597dSJung-uk Kim 1961f13597dSJung-uk Kim int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g, 1971f13597dSJung-uk Kim BIGNUM *sa, BIGNUM *v, char *info) 1981f13597dSJung-uk Kim { 1996f9291ceSJung-uk Kim if (N != NULL) { 2006f9291ceSJung-uk Kim if (s->srp_ctx.N != NULL) { 2016f9291ceSJung-uk Kim if (!BN_copy(s->srp_ctx.N, N)) { 2021f13597dSJung-uk Kim BN_free(s->srp_ctx.N); 2031f13597dSJung-uk Kim s->srp_ctx.N = NULL; 2041f13597dSJung-uk Kim } 2056f9291ceSJung-uk Kim } else 2061f13597dSJung-uk Kim s->srp_ctx.N = BN_dup(N); 2071f13597dSJung-uk Kim } 2086f9291ceSJung-uk Kim if (g != NULL) { 2096f9291ceSJung-uk Kim if (s->srp_ctx.g != NULL) { 2106f9291ceSJung-uk Kim if (!BN_copy(s->srp_ctx.g, g)) { 2111f13597dSJung-uk Kim BN_free(s->srp_ctx.g); 2121f13597dSJung-uk Kim s->srp_ctx.g = NULL; 2131f13597dSJung-uk Kim } 2146f9291ceSJung-uk Kim } else 2151f13597dSJung-uk Kim s->srp_ctx.g = BN_dup(g); 2161f13597dSJung-uk Kim } 2176f9291ceSJung-uk Kim if (sa != NULL) { 2186f9291ceSJung-uk Kim if (s->srp_ctx.s != NULL) { 2196f9291ceSJung-uk Kim if (!BN_copy(s->srp_ctx.s, sa)) { 2201f13597dSJung-uk Kim BN_free(s->srp_ctx.s); 2211f13597dSJung-uk Kim s->srp_ctx.s = NULL; 2221f13597dSJung-uk Kim } 2236f9291ceSJung-uk Kim } else 2241f13597dSJung-uk Kim s->srp_ctx.s = BN_dup(sa); 2251f13597dSJung-uk Kim } 2266f9291ceSJung-uk Kim if (v != NULL) { 2276f9291ceSJung-uk Kim if (s->srp_ctx.v != NULL) { 2286f9291ceSJung-uk Kim if (!BN_copy(s->srp_ctx.v, v)) { 2291f13597dSJung-uk Kim BN_free(s->srp_ctx.v); 2301f13597dSJung-uk Kim s->srp_ctx.v = NULL; 2311f13597dSJung-uk Kim } 2326f9291ceSJung-uk Kim } else 2331f13597dSJung-uk Kim s->srp_ctx.v = BN_dup(v); 2341f13597dSJung-uk Kim } 235*e71b7053SJung-uk Kim if (info != NULL) { 236*e71b7053SJung-uk Kim if (s->srp_ctx.info) 237*e71b7053SJung-uk Kim OPENSSL_free(s->srp_ctx.info); 238*e71b7053SJung-uk Kim if ((s->srp_ctx.info = BUF_strdup(info)) == NULL) 239*e71b7053SJung-uk Kim return -1; 240*e71b7053SJung-uk Kim } 2411f13597dSJung-uk Kim 2421f13597dSJung-uk Kim if (!(s->srp_ctx.N) || 2436f9291ceSJung-uk Kim !(s->srp_ctx.g) || !(s->srp_ctx.s) || !(s->srp_ctx.v)) 2441f13597dSJung-uk Kim return -1; 2451f13597dSJung-uk Kim 2461f13597dSJung-uk Kim return 1; 2471f13597dSJung-uk Kim } 2481f13597dSJung-uk Kim 249*e71b7053SJung-uk Kim int srp_generate_server_master_secret(SSL *s) 2501f13597dSJung-uk Kim { 2511f13597dSJung-uk Kim BIGNUM *K = NULL, *u = NULL; 252*e71b7053SJung-uk Kim int ret = -1, tmp_len = 0; 2531f13597dSJung-uk Kim unsigned char *tmp = NULL; 2541f13597dSJung-uk Kim 2551f13597dSJung-uk Kim if (!SRP_Verify_A_mod_N(s->srp_ctx.A, s->srp_ctx.N)) 2561f13597dSJung-uk Kim goto err; 257*e71b7053SJung-uk Kim if ((u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) == NULL) 2581f13597dSJung-uk Kim goto err; 259*e71b7053SJung-uk Kim if ((K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b, 260*e71b7053SJung-uk Kim s->srp_ctx.N)) == NULL) 2611f13597dSJung-uk Kim goto err; 2621f13597dSJung-uk Kim 2631f13597dSJung-uk Kim tmp_len = BN_num_bytes(K); 264*e71b7053SJung-uk Kim if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) { 265*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INTERNAL_ERROR, 266*e71b7053SJung-uk Kim SSL_F_SRP_GENERATE_SERVER_MASTER_SECRET, ERR_R_MALLOC_FAILURE); 2671f13597dSJung-uk Kim goto err; 2681f13597dSJung-uk Kim } 269*e71b7053SJung-uk Kim BN_bn2bin(K, tmp); 270*e71b7053SJung-uk Kim /* Calls SSLfatal() as required */ 271*e71b7053SJung-uk Kim ret = ssl_generate_master_secret(s, tmp, tmp_len, 1); 272*e71b7053SJung-uk Kim err: 2731f13597dSJung-uk Kim BN_clear_free(K); 2741f13597dSJung-uk Kim BN_clear_free(u); 2751f13597dSJung-uk Kim return ret; 2761f13597dSJung-uk Kim } 2771f13597dSJung-uk Kim 2781f13597dSJung-uk Kim /* client side */ 279*e71b7053SJung-uk Kim int srp_generate_client_master_secret(SSL *s) 2801f13597dSJung-uk Kim { 2811f13597dSJung-uk Kim BIGNUM *x = NULL, *u = NULL, *K = NULL; 282*e71b7053SJung-uk Kim int ret = -1, tmp_len = 0; 2831f13597dSJung-uk Kim char *passwd = NULL; 2841f13597dSJung-uk Kim unsigned char *tmp = NULL; 2851f13597dSJung-uk Kim 2866f9291ceSJung-uk Kim /* 2876f9291ceSJung-uk Kim * Checks if b % n == 0 2881f13597dSJung-uk Kim */ 289*e71b7053SJung-uk Kim if (SRP_Verify_B_mod_N(s->srp_ctx.B, s->srp_ctx.N) == 0 290*e71b7053SJung-uk Kim || (u = SRP_Calc_u(s->srp_ctx.A, s->srp_ctx.B, s->srp_ctx.N)) 291*e71b7053SJung-uk Kim == NULL 292*e71b7053SJung-uk Kim || s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) { 293*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INTERNAL_ERROR, 294*e71b7053SJung-uk Kim SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET, ERR_R_INTERNAL_ERROR); 2956f9291ceSJung-uk Kim goto err; 296*e71b7053SJung-uk Kim } 297*e71b7053SJung-uk Kim if ((passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s, 298*e71b7053SJung-uk Kim s->srp_ctx.SRP_cb_arg)) 299*e71b7053SJung-uk Kim == NULL) { 300*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INTERNAL_ERROR, 301*e71b7053SJung-uk Kim SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET, 302*e71b7053SJung-uk Kim SSL_R_CALLBACK_FAILED); 3036f9291ceSJung-uk Kim goto err; 304*e71b7053SJung-uk Kim } 305*e71b7053SJung-uk Kim if ((x = SRP_Calc_x(s->srp_ctx.s, s->srp_ctx.login, passwd)) == NULL 306*e71b7053SJung-uk Kim || (K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, 307*e71b7053SJung-uk Kim s->srp_ctx.g, x, 308*e71b7053SJung-uk Kim s->srp_ctx.a, u)) == NULL) { 309*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INTERNAL_ERROR, 310*e71b7053SJung-uk Kim SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET, ERR_R_INTERNAL_ERROR); 3116f9291ceSJung-uk Kim goto err; 312*e71b7053SJung-uk Kim } 3131f13597dSJung-uk Kim 3141f13597dSJung-uk Kim tmp_len = BN_num_bytes(K); 315*e71b7053SJung-uk Kim if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) { 316*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INTERNAL_ERROR, 317*e71b7053SJung-uk Kim SSL_F_SRP_GENERATE_CLIENT_MASTER_SECRET, ERR_R_MALLOC_FAILURE); 3186f9291ceSJung-uk Kim goto err; 3191f13597dSJung-uk Kim } 320*e71b7053SJung-uk Kim BN_bn2bin(K, tmp); 321*e71b7053SJung-uk Kim /* Calls SSLfatal() as required */ 322*e71b7053SJung-uk Kim ret = ssl_generate_master_secret(s, tmp, tmp_len, 1); 323*e71b7053SJung-uk Kim err: 3241f13597dSJung-uk Kim BN_clear_free(K); 3251f13597dSJung-uk Kim BN_clear_free(x); 326*e71b7053SJung-uk Kim if (passwd != NULL) 327*e71b7053SJung-uk Kim OPENSSL_clear_free(passwd, strlen(passwd)); 3281f13597dSJung-uk Kim BN_clear_free(u); 3291f13597dSJung-uk Kim return ret; 3301f13597dSJung-uk Kim } 3311f13597dSJung-uk Kim 332*e71b7053SJung-uk Kim int srp_verify_server_param(SSL *s) 333a93cbc2bSJung-uk Kim { 334a93cbc2bSJung-uk Kim SRP_CTX *srp = &s->srp_ctx; 3356f9291ceSJung-uk Kim /* 3366f9291ceSJung-uk Kim * Sanity check parameters: we can quickly check B % N == 0 by checking B 3376f9291ceSJung-uk Kim * != 0 since B < N 338a93cbc2bSJung-uk Kim */ 339a93cbc2bSJung-uk Kim if (BN_ucmp(srp->g, srp->N) >= 0 || BN_ucmp(srp->B, srp->N) >= 0 3406f9291ceSJung-uk Kim || BN_is_zero(srp->B)) { 341*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_SRP_VERIFY_SERVER_PARAM, 342*e71b7053SJung-uk Kim SSL_R_BAD_DATA); 343a93cbc2bSJung-uk Kim return 0; 344a93cbc2bSJung-uk Kim } 345a93cbc2bSJung-uk Kim 3466f9291ceSJung-uk Kim if (BN_num_bits(srp->N) < srp->strength) { 347*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_F_SRP_VERIFY_SERVER_PARAM, 348*e71b7053SJung-uk Kim SSL_R_INSUFFICIENT_SECURITY); 349a93cbc2bSJung-uk Kim return 0; 350a93cbc2bSJung-uk Kim } 351a93cbc2bSJung-uk Kim 3526f9291ceSJung-uk Kim if (srp->SRP_verify_param_callback) { 3536f9291ceSJung-uk Kim if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) { 354*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, 355*e71b7053SJung-uk Kim SSL_F_SRP_VERIFY_SERVER_PARAM, 356*e71b7053SJung-uk Kim SSL_R_CALLBACK_FAILED); 357a93cbc2bSJung-uk Kim return 0; 358a93cbc2bSJung-uk Kim } 3596f9291ceSJung-uk Kim } else if (!SRP_check_known_gN_param(srp->g, srp->N)) { 360*e71b7053SJung-uk Kim SSLfatal(s, SSL_AD_INSUFFICIENT_SECURITY, SSL_F_SRP_VERIFY_SERVER_PARAM, 361*e71b7053SJung-uk Kim SSL_R_INSUFFICIENT_SECURITY); 362a93cbc2bSJung-uk Kim return 0; 363a93cbc2bSJung-uk Kim } 364a93cbc2bSJung-uk Kim 365a93cbc2bSJung-uk Kim return 1; 366a93cbc2bSJung-uk Kim } 367a93cbc2bSJung-uk Kim 3681f13597dSJung-uk Kim int SRP_Calc_A_param(SSL *s) 3691f13597dSJung-uk Kim { 3701f13597dSJung-uk Kim unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH]; 3711f13597dSJung-uk Kim 372*e71b7053SJung-uk Kim if (RAND_priv_bytes(rnd, sizeof(rnd)) <= 0) 373*e71b7053SJung-uk Kim return 0; 3741f13597dSJung-uk Kim s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a); 3751f13597dSJung-uk Kim OPENSSL_cleanse(rnd, sizeof(rnd)); 3761f13597dSJung-uk Kim 377*e71b7053SJung-uk Kim if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g))) 378*e71b7053SJung-uk Kim return 0; 3791f13597dSJung-uk Kim 3801f13597dSJung-uk Kim return 1; 3811f13597dSJung-uk Kim } 3821f13597dSJung-uk Kim 3831f13597dSJung-uk Kim BIGNUM *SSL_get_srp_g(SSL *s) 3841f13597dSJung-uk Kim { 3851f13597dSJung-uk Kim if (s->srp_ctx.g != NULL) 3861f13597dSJung-uk Kim return s->srp_ctx.g; 3871f13597dSJung-uk Kim return s->ctx->srp_ctx.g; 3881f13597dSJung-uk Kim } 3891f13597dSJung-uk Kim 3901f13597dSJung-uk Kim BIGNUM *SSL_get_srp_N(SSL *s) 3911f13597dSJung-uk Kim { 3921f13597dSJung-uk Kim if (s->srp_ctx.N != NULL) 3931f13597dSJung-uk Kim return s->srp_ctx.N; 3941f13597dSJung-uk Kim return s->ctx->srp_ctx.N; 3951f13597dSJung-uk Kim } 3961f13597dSJung-uk Kim 3971f13597dSJung-uk Kim char *SSL_get_srp_username(SSL *s) 3981f13597dSJung-uk Kim { 3991f13597dSJung-uk Kim if (s->srp_ctx.login != NULL) 4001f13597dSJung-uk Kim return s->srp_ctx.login; 4011f13597dSJung-uk Kim return s->ctx->srp_ctx.login; 4021f13597dSJung-uk Kim } 4031f13597dSJung-uk Kim 4041f13597dSJung-uk Kim char *SSL_get_srp_userinfo(SSL *s) 4051f13597dSJung-uk Kim { 4061f13597dSJung-uk Kim if (s->srp_ctx.info != NULL) 4071f13597dSJung-uk Kim return s->srp_ctx.info; 4081f13597dSJung-uk Kim return s->ctx->srp_ctx.info; 4091f13597dSJung-uk Kim } 4101f13597dSJung-uk Kim 4111f13597dSJung-uk Kim # define tls1_ctx_ctrl ssl3_ctx_ctrl 4121f13597dSJung-uk Kim # define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl 4131f13597dSJung-uk Kim 4141f13597dSJung-uk Kim int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name) 4151f13597dSJung-uk Kim { 4161f13597dSJung-uk Kim return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name); 4171f13597dSJung-uk Kim } 4181f13597dSJung-uk Kim 4191f13597dSJung-uk Kim int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password) 4201f13597dSJung-uk Kim { 4211f13597dSJung-uk Kim return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password); 4221f13597dSJung-uk Kim } 4231f13597dSJung-uk Kim 4241f13597dSJung-uk Kim int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength) 4251f13597dSJung-uk Kim { 4261f13597dSJung-uk Kim return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength, 4271f13597dSJung-uk Kim NULL); 4281f13597dSJung-uk Kim } 4291f13597dSJung-uk Kim 4306f9291ceSJung-uk Kim int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx, 4316f9291ceSJung-uk Kim int (*cb) (SSL *, void *)) 4321f13597dSJung-uk Kim { 4331f13597dSJung-uk Kim return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB, 4341f13597dSJung-uk Kim (void (*)(void))cb); 4351f13597dSJung-uk Kim } 4361f13597dSJung-uk Kim 4371f13597dSJung-uk Kim int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg) 4381f13597dSJung-uk Kim { 4391f13597dSJung-uk Kim return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg); 4401f13597dSJung-uk Kim } 4411f13597dSJung-uk Kim 4421f13597dSJung-uk Kim int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx, 4431f13597dSJung-uk Kim int (*cb) (SSL *, int *, void *)) 4441f13597dSJung-uk Kim { 4451f13597dSJung-uk Kim return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB, 4461f13597dSJung-uk Kim (void (*)(void))cb); 4471f13597dSJung-uk Kim } 4481f13597dSJung-uk Kim 4496f9291ceSJung-uk Kim int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx, 4506f9291ceSJung-uk Kim char *(*cb) (SSL *, void *)) 4511f13597dSJung-uk Kim { 4521f13597dSJung-uk Kim return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB, 4531f13597dSJung-uk Kim (void (*)(void))cb); 4541f13597dSJung-uk Kim } 4551f13597dSJung-uk Kim 4561f13597dSJung-uk Kim #endif 457