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542 lines
16 KiB
542 lines
16 KiB
/* 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 "ssl_locl.h" |
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#ifndef OPENSSL_NO_SRP |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return 1; |
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} |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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; |
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} |
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} else if (!SRP_check_known_gN_param(srp->g, srp->N)) { |
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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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return 1; |
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} |
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|
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int SRP_Calc_A_param(SSL *s) |
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{ |
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unsigned char rnd[SSL_MAX_MASTER_KEY_LENGTH]; |
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|
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if (RAND_bytes(rnd, sizeof(rnd)) <= 0) |
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return -1; |
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s->srp_ctx.a = BN_bin2bn(rnd, sizeof(rnd), s->srp_ctx.a); |
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OPENSSL_cleanse(rnd, sizeof(rnd)); |
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|
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if (! |
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(s->srp_ctx.A = SRP_Calc_A(s->srp_ctx.a, s->srp_ctx.N, s->srp_ctx.g))) |
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return -1; |
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|
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return 1; |
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} |
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|
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BIGNUM *SSL_get_srp_g(SSL *s) |
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{ |
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if (s->srp_ctx.g != NULL) |
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return s->srp_ctx.g; |
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return s->ctx->srp_ctx.g; |
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} |
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|
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BIGNUM *SSL_get_srp_N(SSL *s) |
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{ |
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if (s->srp_ctx.N != NULL) |
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return s->srp_ctx.N; |
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return s->ctx->srp_ctx.N; |
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} |
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|
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char *SSL_get_srp_username(SSL *s) |
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{ |
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if (s->srp_ctx.login != NULL) |
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return s->srp_ctx.login; |
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return s->ctx->srp_ctx.login; |
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} |
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|
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char *SSL_get_srp_userinfo(SSL *s) |
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{ |
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if (s->srp_ctx.info != NULL) |
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return s->srp_ctx.info; |
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return s->ctx->srp_ctx.info; |
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} |
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|
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# define tls1_ctx_ctrl ssl3_ctx_ctrl |
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# define tls1_ctx_callback_ctrl ssl3_ctx_callback_ctrl |
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|
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int SSL_CTX_set_srp_username(SSL_CTX *ctx, char *name) |
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{ |
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return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME, 0, name); |
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} |
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|
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int SSL_CTX_set_srp_password(SSL_CTX *ctx, char *password) |
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{ |
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return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_PASSWORD, 0, password); |
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} |
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|
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int SSL_CTX_set_srp_strength(SSL_CTX *ctx, int strength) |
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{ |
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return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_STRENGTH, strength, |
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NULL); |
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} |
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|
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int SSL_CTX_set_srp_verify_param_callback(SSL_CTX *ctx, |
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int (*cb) (SSL *, void *)) |
|
{ |
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return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_SRP_VERIFY_PARAM_CB, |
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(void (*)(void))cb); |
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} |
|
|
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int SSL_CTX_set_srp_cb_arg(SSL_CTX *ctx, void *arg) |
|
{ |
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return tls1_ctx_ctrl(ctx, SSL_CTRL_SET_SRP_ARG, 0, arg); |
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} |
|
|
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int SSL_CTX_set_srp_username_callback(SSL_CTX *ctx, |
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int (*cb) (SSL *, int *, void *)) |
|
{ |
|
return tls1_ctx_callback_ctrl(ctx, SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB, |
|
(void (*)(void))cb); |
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} |
|
|
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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); |
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} |
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|
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#endif
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