/* $OpenBSD: t1_reneg.c,v 1.11 2015/06/20 16:42:48 doug Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * Copyright (c) 1998-2009 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include "ssl_locl.h" #include "bytestring.h" /* Add the client's renegotiation binding */ int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len, int maxlen) { if (p) { if ((s->s3->previous_client_finished_len + 1) > maxlen) { SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATE_EXT_TOO_LONG); return 0; } /* Length byte */ *p = s->s3->previous_client_finished_len; p++; memcpy(p, s->s3->previous_client_finished, s->s3->previous_client_finished_len); } *len = s->s3->previous_client_finished_len + 1; return 1; } /* Parse the client's renegotiation binding and abort if it's not right */ int ssl_parse_clienthello_renegotiate_ext(SSL *s, const unsigned char *d, int len, int *al) { CBS cbs, reneg; if (len < 0) { SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } CBS_init(&cbs, d, len); if (!CBS_get_u8_length_prefixed(&cbs, &reneg) || /* Consistency check */ CBS_len(&cbs) != 0) { SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } /* Check that the extension matches */ if (CBS_len(&reneg) != s->s3->previous_client_finished_len) { SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } if (!CBS_mem_equal(&reneg, s->s3->previous_client_finished, s->s3->previous_client_finished_len)) { SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } s->s3->send_connection_binding = 1; return 1; } /* Add the server's renegotiation binding */ int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len, int maxlen) { if (p) { if ((s->s3->previous_client_finished_len + s->s3->previous_server_finished_len + 1) > maxlen) { SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATE_EXT_TOO_LONG); return 0; } /* Length byte */ *p = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len; p++; memcpy(p, s->s3->previous_client_finished, s->s3->previous_client_finished_len); p += s->s3->previous_client_finished_len; memcpy(p, s->s3->previous_server_finished, s->s3->previous_server_finished_len); } *len = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len + 1; return 1; } /* Parse the server's renegotiation binding and abort if it's not right */ int ssl_parse_serverhello_renegotiate_ext(SSL *s, const unsigned char *d, int len, int *al) { CBS cbs, reneg, previous_client, previous_server; int expected_len = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len; /* Check for logic errors */ OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len); OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len); if (len < 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } CBS_init(&cbs, d, len); if (!CBS_get_u8_length_prefixed(&cbs, &reneg) || /* Consistency check */ CBS_len(&cbs) != 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_ENCODING_ERR); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } /* Check that the extension matches */ if (CBS_len(&reneg) != expected_len || !CBS_get_bytes(&reneg, &previous_client, s->s3->previous_client_finished_len) || !CBS_get_bytes(&reneg, &previous_server, s->s3->previous_server_finished_len) || CBS_len(&reneg) != 0) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } if (!CBS_mem_equal(&previous_client, s->s3->previous_client_finished, CBS_len(&previous_client))) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_HANDSHAKE_FAILURE; return 0; } if (!CBS_mem_equal(&previous_server, s->s3->previous_server_finished, CBS_len(&previous_server))) { SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT, SSL_R_RENEGOTIATION_MISMATCH); *al = SSL_AD_ILLEGAL_PARAMETER; return 0; } s->s3->send_connection_binding = 1; return 1; }