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