--- /dev/null
+/* ssl/tls_srp.c */
+/* Written by Christophe Renou (christophe.renou@edelweb.fr) with
+ * the precious help of Peter Sylvester (peter.sylvester@edelweb.fr)
+ * for the EdelKey project and contributed to the OpenSSL project 2004.
+ */
+/* ====================================================================
+ * Copyright (c) 2004-2011 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+#include "ssl_locl.h"
+#ifndef OPENSSL_NO_SRP
+
+#include <openssl/rand.h>
+#include <openssl/srp.h>
+#include <openssl/err.h>
+
+int SSL_CTX_SRP_CTX_free(struct ssl_ctx_st *ctx)
+ {
+ if (ctx == NULL)
+ return 0;
+ OPENSSL_free(ctx->srp_ctx.login);
+ BN_free(ctx->srp_ctx.N);
+ BN_free(ctx->srp_ctx.g);
+ BN_free(ctx->srp_ctx.s);
+ BN_free(ctx->srp_ctx.B);
+ BN_free(ctx->srp_ctx.A);
+ BN_free(ctx->srp_ctx.a);
+ BN_free(ctx->srp_ctx.b);
+ BN_free(ctx->srp_ctx.v);
+ ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
+ ctx->srp_ctx.SRP_cb_arg = NULL;
+ ctx->srp_ctx.SRP_verify_param_callback = NULL;
+ ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
+ ctx->srp_ctx.N = NULL;
+ ctx->srp_ctx.g = NULL;
+ ctx->srp_ctx.s = NULL;
+ ctx->srp_ctx.B = NULL;
+ ctx->srp_ctx.A = NULL;
+ ctx->srp_ctx.a = NULL;
+ ctx->srp_ctx.b = NULL;
+ ctx->srp_ctx.v = NULL;
+ ctx->srp_ctx.login = NULL;
+ ctx->srp_ctx.info = NULL;
+ ctx->srp_ctx.strength = SRP_MINIMAL_N;
+ ctx->srp_ctx.srp_Mask = 0;
+ return (1);
+ }
+
+int SSL_SRP_CTX_free(struct ssl_st *s)
+ {
+ if (s == NULL)
+ return 0;
+ OPENSSL_free(s->srp_ctx.login);
+ BN_free(s->srp_ctx.N);
+ BN_free(s->srp_ctx.g);
+ BN_free(s->srp_ctx.s);
+ BN_free(s->srp_ctx.B);
+ BN_free(s->srp_ctx.A);
+ BN_free(s->srp_ctx.a);
+ BN_free(s->srp_ctx.b);
+ BN_free(s->srp_ctx.v);
+ s->srp_ctx.TLS_ext_srp_username_callback = NULL;
+ s->srp_ctx.SRP_cb_arg = NULL;
+ s->srp_ctx.SRP_verify_param_callback = NULL;
+ s->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
+ s->srp_ctx.N = NULL;
+ s->srp_ctx.g = NULL;
+ s->srp_ctx.s = NULL;
+ s->srp_ctx.B = NULL;
+ s->srp_ctx.A = NULL;
+ s->srp_ctx.a = NULL;
+ s->srp_ctx.b = NULL;
+ s->srp_ctx.v = NULL;
+ s->srp_ctx.login = NULL;
+ s->srp_ctx.info = NULL;
+ s->srp_ctx.strength = SRP_MINIMAL_N;
+ s->srp_ctx.srp_Mask = 0;
+ return (1);
+ }
+
+int SSL_SRP_CTX_init(struct ssl_st *s)
+ {
+ SSL_CTX *ctx;
+
+ if ((s == NULL) || ((ctx = s->ctx) == NULL))
+ return 0;
+ s->srp_ctx.SRP_cb_arg = ctx->srp_ctx.SRP_cb_arg;
+ /* set client Hello login callback */
+ s->srp_ctx.TLS_ext_srp_username_callback = ctx->srp_ctx.TLS_ext_srp_username_callback;
+ /* set SRP N/g param callback for verification */
+ s->srp_ctx.SRP_verify_param_callback = ctx->srp_ctx.SRP_verify_param_callback;
+ /* set SRP client passwd callback */
+ s->srp_ctx.SRP_give_srp_client_pwd_callback = ctx->srp_ctx.SRP_give_srp_client_pwd_callback;
+
+ s->srp_ctx.N = NULL;
+ s->srp_ctx.g = NULL;
+ s->srp_ctx.s = NULL;
+ s->srp_ctx.B = NULL;
+ s->srp_ctx.A = NULL;
+ s->srp_ctx.a = NULL;
+ s->srp_ctx.b = NULL;
+ s->srp_ctx.v = NULL;
+ s->srp_ctx.login = NULL;
+ s->srp_ctx.info = ctx->srp_ctx.info;
+ s->srp_ctx.strength = ctx->srp_ctx.strength;
+
+ if (((ctx->srp_ctx.N != NULL) &&
+ ((s->srp_ctx.N = BN_dup(ctx->srp_ctx.N)) == NULL)) ||
+ ((ctx->srp_ctx.g != NULL) &&
+ ((s->srp_ctx.g = BN_dup(ctx->srp_ctx.g)) == NULL)) ||
+ ((ctx->srp_ctx.s != NULL) &&
+ ((s->srp_ctx.s = BN_dup(ctx->srp_ctx.s)) == NULL)) ||
+ ((ctx->srp_ctx.B != NULL) &&
+ ((s->srp_ctx.B = BN_dup(ctx->srp_ctx.B)) == NULL)) ||
+ ((ctx->srp_ctx.A != NULL) &&
+ ((s->srp_ctx.A = BN_dup(ctx->srp_ctx.A)) == NULL)) ||
+ ((ctx->srp_ctx.a != NULL) &&
+ ((s->srp_ctx.a = BN_dup(ctx->srp_ctx.a)) == NULL)) ||
+ ((ctx->srp_ctx.v != NULL) &&
+ ((s->srp_ctx.v = BN_dup(ctx->srp_ctx.v)) == NULL)) ||
+ ((ctx->srp_ctx.b != NULL) &&
+ ((s->srp_ctx.b = BN_dup(ctx->srp_ctx.b)) == NULL)))
+ {
+ SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_BN_LIB);
+ goto err;
+ }
+ if ((ctx->srp_ctx.login != NULL) &&
+ ((s->srp_ctx.login = BUF_strdup(ctx->srp_ctx.login)) == NULL))
+ {
+ SSLerr(SSL_F_SSL_SRP_CTX_INIT,ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ s->srp_ctx.srp_Mask = ctx->srp_ctx.srp_Mask;
+
+ return (1);
+err:
+ OPENSSL_free(s->srp_ctx.login);
+ BN_free(s->srp_ctx.N);
+ BN_free(s->srp_ctx.g);
+ BN_free(s->srp_ctx.s);
+ BN_free(s->srp_ctx.B);
+ BN_free(s->srp_ctx.A);
+ BN_free(s->srp_ctx.a);
+ BN_free(s->srp_ctx.b);
+ BN_free(s->srp_ctx.v);
+ return (0);
+ }
+
+int SSL_CTX_SRP_CTX_init(struct ssl_ctx_st *ctx)
+ {
+ if (ctx == NULL)
+ return 0;
+
+ ctx->srp_ctx.SRP_cb_arg = NULL;
+ /* set client Hello login callback */
+ ctx->srp_ctx.TLS_ext_srp_username_callback = NULL;
+ /* set SRP N/g param callback for verification */
+ ctx->srp_ctx.SRP_verify_param_callback = NULL;
+ /* set SRP client passwd callback */
+ ctx->srp_ctx.SRP_give_srp_client_pwd_callback = NULL;
+
+ ctx->srp_ctx.N = NULL;
+ ctx->srp_ctx.g = NULL;
+ ctx->srp_ctx.s = NULL;
+ ctx->srp_ctx.B = NULL;
+ ctx->srp_ctx.A = NULL;
+ ctx->srp_ctx.a = NULL;
+ ctx->srp_ctx.b = NULL;
+ ctx->srp_ctx.v = NULL;
+ ctx->srp_ctx.login = NULL;
+ ctx->srp_ctx.srp_Mask = 0;
+ ctx->srp_ctx.info = NULL;
+ ctx->srp_ctx.strength = SRP_MINIMAL_N;
+
+ return (1);
+ }
+
+/* server side */
+int SSL_srp_server_param_with_username(SSL *s, int *ad)
+ {
+ unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
+ int al;
+
+ *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
+ if ((s->srp_ctx.TLS_ext_srp_username_callback !=NULL) &&
+ ((al = s->srp_ctx.TLS_ext_srp_username_callback(s, ad, s->srp_ctx.SRP_cb_arg))!=SSL_ERROR_NONE))
+ return al;
+
+ *ad = SSL_AD_INTERNAL_ERROR;
+ if ((s->srp_ctx.N == NULL) ||
+ (s->srp_ctx.g == NULL) ||
+ (s->srp_ctx.s == NULL) ||
+ (s->srp_ctx.v == NULL))
+ return SSL3_AL_FATAL;
+
+ if (RAND_bytes(b, sizeof(b)) <= 0)
+ return SSL3_AL_FATAL;
+ s->srp_ctx.b = BN_bin2bn(b,sizeof(b),NULL);
+ OPENSSL_cleanse(b,sizeof(b));
+
+ /* Calculate: B = (kv + g^b) % N */
+
+ return ((s->srp_ctx.B = SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g, s->srp_ctx.v)) != NULL)?
+ SSL_ERROR_NONE:SSL3_AL_FATAL;
+ }
+
+/* If the server just has the raw password, make up a verifier entry on the fly */
+int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass, const char *grp)
+ {
+ SRP_gN *GN = SRP_get_default_gN(grp);
+ if(GN == NULL) return -1;
+ s->srp_ctx.N = BN_dup(GN->N);
+ s->srp_ctx.g = BN_dup(GN->g);
+ if(s->srp_ctx.v != NULL)
+ {
+ BN_clear_free(s->srp_ctx.v);
+ s->srp_ctx.v = NULL;
+ }
+ if(s->srp_ctx.s != NULL)
+ {
+ BN_clear_free(s->srp_ctx.s);
+ s->srp_ctx.s = NULL;
+ }
+ if(!SRP_create_verifier_BN(user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g)) return -1;
+
+ return 1;
+ }
+
+int SSL_set_srp_server_param(SSL *s, const BIGNUM *N, const BIGNUM *g,
+ BIGNUM *sa, BIGNUM *v, char *info)
+ {
+ if (N!= NULL)
+ {
+ if (s->srp_ctx.N != NULL)
+ {
+ if (!BN_copy(s->srp_ctx.N,N))
+ {
+ BN_free(s->srp_ctx.N);
+ s->srp_ctx.N = NULL;
+ }
+ }
+ else
+ s->srp_ctx.N = BN_dup(N);
+ }
+ if (g!= NULL)
+ {
+ if (s->srp_ctx.g != NULL)
+ {
+ if (!BN_copy(s->srp_ctx.g,g))
+ {
+ BN_free(s->srp_ctx.g);
+ s->srp_ctx.g = NULL;
+ }
+ }
+ else
+ s->srp_ctx.g = BN_dup(g);
+ }
+ if (sa!= NULL)
+ {
+ if (s->srp_ctx.s != NULL)
+ {
+ if (!BN_copy(s->srp_ctx.s,sa))
+ {
+ BN_free(s->srp_ctx.s);
+ s->srp_ctx.s = NULL;
+ }
+ }
+ else
+ s->srp_ctx.s = BN_dup(sa);
+ }
+ if (v!= NULL)
+ {
+ if (s->srp_ctx.v != NULL)
+ {
+ if (!BN_copy(s->srp_ctx.v,v))
+ {
+ BN_free(s->srp_ctx.v);
+ s->srp_ctx.v = NULL;
+ }
+ }
+ else
+ s->srp_ctx.v = BN_dup(v);
+ }
+ s->srp_ctx.info = info;
+
+ if (!(s->srp_ctx.N) ||
+ !(s->srp_ctx.g) ||
+ !(s->srp_ctx.s) ||
+ !(s->srp_ctx.v))
+ return -1;
+
+ return 1;
+ }
+
+int SRP_generate_server_master_secret(SSL *s,unsigned char *master_key)
+ {
+ BIGNUM *K = NULL, *u = NULL;
+ int ret = -1, tmp_len;
+ unsigned char *tmp = NULL;
+
+ if (!SRP_Verify_A_mod_N(s->srp_ctx.A,s->srp_ctx.N))
+ goto err;
+ if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N)))
+ goto err;
+ if (!(K = SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b, s->srp_ctx.N)))
+ goto err;
+
+ tmp_len = BN_num_bytes(K);
+ if ((tmp = OPENSSL_malloc(tmp_len)) == NULL)
+ goto err;
+ BN_bn2bin(K, tmp);
+ ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
+err:
+ if (tmp)
+ {
+ OPENSSL_cleanse(tmp,tmp_len) ;
+ OPENSSL_free(tmp);
+ }
+ BN_clear_free(K);
+ BN_clear_free(u);
+ return ret;
+ }
+
+/* client side */
+int SRP_generate_client_master_secret(SSL *s,unsigned char *master_key)
+ {
+ BIGNUM *x = NULL, *u = NULL, *K = NULL;
+ int ret = -1, tmp_len;
+ char *passwd = NULL;
+ unsigned char *tmp = NULL;
+
+ /* Checks if b % n == 0
+ */
+ if (SRP_Verify_B_mod_N(s->srp_ctx.B,s->srp_ctx.N)==0) goto err;
+ if (!(u = SRP_Calc_u(s->srp_ctx.A,s->srp_ctx.B,s->srp_ctx.N))) goto err;
+ if (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL) goto err;
+ if (!(passwd = s->srp_ctx.SRP_give_srp_client_pwd_callback(s, s->srp_ctx.SRP_cb_arg))) goto err;
+ if (!(x = SRP_Calc_x(s->srp_ctx.s,s->srp_ctx.login,passwd))) goto err;
+ if (!(K = SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x, s->srp_ctx.a, u))) goto err;
+
+ tmp_len = BN_num_bytes(K);
+ if ((tmp = OPENSSL_malloc(tmp_len)) == NULL) goto err;
+ BN_bn2bin(K, tmp);
+ ret = s->method->ssl3_enc->generate_master_secret(s,master_key,tmp,tmp_len);
+err:
+ if (tmp)
+ {
+ OPENSSL_cleanse(tmp,tmp_len) ;
+ OPENSSL_free(tmp);
+ }
+ BN_clear_free(K);
+ BN_clear_free(x);
+ if (passwd)
+ {
+ OPENSSL_cleanse(passwd,strlen(passwd)) ;
+ OPENSSL_free(passwd);
+ }
+ BN_clear_free(u);
+ return ret;
+ }
+
+int srp_verify_server_param(SSL *s, int *al)
+ {
+ SRP_CTX *srp = &s->srp_ctx;
+ /* Sanity check parameters: we can quickly check B % N == 0
+ * by checking B != 0 since B < N
+ */
+ if (BN_ucmp(srp->g, srp->N) >=0 || BN_ucmp(srp->B, srp->N) >= 0
+ || BN_is_zero(srp->B))
+ {
+ *al = SSL3_AD_ILLEGAL_PARAMETER;
+ return 0;
+ }
+
+ if (BN_num_bits(srp->N) < srp->strength)
+ {
+ *al = TLS1_AD_INSUFFICIENT_SECURITY;
+ return 0;
+ }
+
+ if (srp->SRP_verify_param_callback)
+ {
+ if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0)
+ {
+ *al = TLS1_AD_INSUFFICIENT_SECURITY;
+ return 0;
+ }
+ }
+ else if(!SRP_check_known_gN_param(srp->g, srp->N))
+ {
+ *al = TLS1_AD_INSUFFICIENT_SECURITY;
+ return 0;
+ }
+
+ return 1;
+ }
+
+
+int SRP_Calc_A_param(SSL *s)
+ {
+ unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH];
+
+ RAND_bytes(rnd, sizeof(rnd));
+ s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a);
+ OPENSSL_cleanse(rnd, sizeof(rnd));
+
+ if (!(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a,s->srp_ctx.N,s->srp_ctx.g)))
+ return -1;
+
+ return 1;
+ }
+
+BIGNUM *SSL_get_srp_g(SSL *s)
+ {
+ if (s->srp_ctx.g != NULL)
+ return s->srp_ctx.g;
+ return s->ctx->srp_ctx.g;
+ }
+
+BIGNUM *SSL_get_srp_N(SSL *s)
+ {
+ if (s->srp_ctx.N != NULL)
+ return s->srp_ctx.N;
+ return s->ctx->srp_ctx.N;
+ }
+
+char *SSL_get_srp_username(SSL *s)
+ {
+ if (s->srp_ctx.login != NULL)
+ return s->srp_ctx.login;
+ return s->ctx->srp_ctx.login;
+ }
+
+char *SSL_get_srp_userinfo(SSL *s)
+ {
+ if (s->srp_ctx.info != NULL)
+ return s->srp_ctx.info;
+ return s->ctx->srp_ctx.info;
+ }
+
+#define tls1_ctx_ctrl ssl3_ctx_ctrl
+#define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl
+
+int SSL_CTX_set_srp_username(SSL_CTX *ctx,char *name)
+ {
+ return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME,0,name);
+ }
+
+int SSL_CTX_set_srp_password(SSL_CTX *ctx,char *password)
+ {
+ return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD,0,password);
+ }
+
+int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength)
+ {
+ return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength,
+ NULL);
+ }
+
+int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx, int (*cb)(SSL *,void *))
+ {
+ return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_VERIFY_PARAM_CB,
+ (void (*)(void))cb);
+ }
+
+int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg)
+ {
+ return tls1_ctx_ctrl(ctx,SSL_CTRL_SET_SRP_ARG,0,arg);
+ }
+
+int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx,
+ int (*cb)(SSL *,int *,void *))
+ {
+ return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB,
+ (void (*)(void))cb);
+ }
+
+int SSL_CTX_set_srp_client_pwd_callback(SSL_CTX *ctx, char *(*cb)(SSL *,void *))
+ {
+ return tls1_ctx_callback_ctrl(ctx,SSL_CTRL_SET_SRP_GIVE_CLIENT_PWD_CB,
+ (void (*)(void))cb);
+ }
+
+#endif
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