544 lines
16 KiB
C
544 lines
16 KiB
C
/* ssl/tls_srp.c */
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/*
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* Written by Christophe Renou (christophe.renou@edelweb.fr) with the
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* precious help of Peter Sylvester (peter.sylvester@edelweb.fr) for the
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* 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 <openssl/crypto.h>
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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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#include "ssl_locl.h"
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#ifndef OPENSSL_NO_SRP
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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 =
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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 =
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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 =
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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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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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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 =
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s->srp_ctx.TLS_ext_srp_username_callback(s, ad,
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s->srp_ctx.SRP_cb_arg)) !=
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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) || (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 =
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SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g,
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s->srp_ctx.v)) !=
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NULL) ? SSL_ERROR_NONE : SSL3_AL_FATAL;
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}
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/*
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* If the server just has the raw password, make up a verifier entry on the
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* fly
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*/
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int SSL_set_srp_server_param_pw(SSL *s, const char *user, const char *pass,
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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)
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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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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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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
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(user, pass, &s->srp_ctx.s, &s->srp_ctx.v, GN->N, GN->g))
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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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if (s->srp_ctx.N != NULL) {
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if (!BN_copy(s->srp_ctx.N, N)) {
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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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} 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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if (s->srp_ctx.g != NULL) {
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if (!BN_copy(s->srp_ctx.g, g)) {
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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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} 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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if (s->srp_ctx.s != NULL) {
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if (!BN_copy(s->srp_ctx.s, sa)) {
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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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} 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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if (s->srp_ctx.v != NULL) {
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if (!BN_copy(s->srp_ctx.v, v)) {
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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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} 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) || !(s->srp_ctx.s) || !(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 (!
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(K =
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SRP_Calc_server_key(s->srp_ctx.A, s->srp_ctx.v, u, s->srp_ctx.b,
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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 =
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s->method->ssl3_enc->generate_master_secret(s, master_key, tmp,
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tmp_len);
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err:
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if (tmp) {
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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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/*
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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)
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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 (s->srp_ctx.SRP_give_srp_client_pwd_callback == NULL)
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goto err;
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if (!
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(passwd =
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s->srp_ctx.SRP_give_srp_client_pwd_callback(s,
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s->srp_ctx.SRP_cb_arg)))
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goto err;
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if (!(x = SRP_Calc_x(s->srp_ctx.s, s->srp_ctx.login, passwd)))
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goto err;
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if (!
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(K =
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SRP_Calc_client_key(s->srp_ctx.N, s->srp_ctx.B, s->srp_ctx.g, x,
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s->srp_ctx.a, u)))
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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 =
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s->method->ssl3_enc->generate_master_secret(s, master_key, tmp,
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tmp_len);
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err:
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if (tmp) {
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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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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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/*
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* Sanity check parameters: we can quickly check B % N == 0 by checking B
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* != 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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*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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*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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if (srp->SRP_verify_param_callback(s, srp->SRP_cb_arg) <= 0) {
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*al = TLS1_AD_INSUFFICIENT_SECURITY;
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|
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];
|
|
|
|
if (RAND_bytes(rnd, sizeof(rnd)) <= 0)
|
|
return 0;
|
|
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 0;
|
|
|
|
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
|