xref: /freebsd/crypto/openssl/ssl/tls_srp.c (revision e71b70530d95c4f34d8bdbd78d1242df1ba4a945)
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