/* $OpenBSD: s23_clnt.c,v 1.30 2014/07/10 08:51:14 tedu 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) 1998-2006 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 "ssl_locl.h" #include #include #include #include static const SSL_METHOD *ssl23_get_client_method(int ver); static int ssl23_client_hello(SSL *s); static int ssl23_get_server_hello(SSL *s); const SSL_METHOD SSLv23_client_method_data = { .version = TLS1_2_VERSION, .ssl_new = tls1_new, .ssl_clear = tls1_clear, .ssl_free = tls1_free, .ssl_accept = ssl_undefined_function, .ssl_connect = ssl23_connect, .ssl_read = ssl23_read, .ssl_peek = ssl23_peek, .ssl_write = ssl23_write, .ssl_shutdown = ssl_undefined_function, .ssl_renegotiate = ssl_undefined_function, .ssl_renegotiate_check = ssl_ok, .ssl_get_message = ssl3_get_message, .ssl_read_bytes = ssl3_read_bytes, .ssl_write_bytes = ssl3_write_bytes, .ssl_dispatch_alert = ssl3_dispatch_alert, .ssl_ctrl = ssl3_ctrl, .ssl_ctx_ctrl = ssl3_ctx_ctrl, .get_cipher_by_char = ssl3_get_cipher_by_char, .put_cipher_by_char = ssl23_put_cipher_by_char, .ssl_pending = ssl_undefined_const_function, .num_ciphers = ssl3_num_ciphers, .get_cipher = ssl3_get_cipher, .get_ssl_method = ssl23_get_client_method, .get_timeout = ssl23_default_timeout, .ssl3_enc = &ssl3_undef_enc_method, .ssl_version = ssl_undefined_void_function, .ssl_callback_ctrl = ssl3_callback_ctrl, .ssl_ctx_callback_ctrl = ssl3_ctx_callback_ctrl, }; const SSL_METHOD * SSLv23_client_method(void) { return &SSLv23_client_method_data; } static const SSL_METHOD * ssl23_get_client_method(int ver) { if (ver == SSL3_VERSION) return (SSLv3_client_method()); if (ver == TLS1_VERSION) return (TLSv1_client_method()); if (ver == TLS1_1_VERSION) return (TLSv1_1_client_method()); if (ver == TLS1_2_VERSION) return (TLSv1_2_client_method()); return (NULL); } int ssl23_connect(SSL *s) { BUF_MEM *buf = NULL; void (*cb)(const SSL *ssl, int type, int val) = NULL; int ret = -1; int new_state, state; ERR_clear_error(); errno = 0; if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); for (;;) { state = s->state; switch (s->state) { case SSL_ST_BEFORE: case SSL_ST_CONNECT: case SSL_ST_BEFORE|SSL_ST_CONNECT: case SSL_ST_OK|SSL_ST_CONNECT: if (s->session != NULL) { SSLerr(SSL_F_SSL23_CONNECT, SSL_R_SSL23_DOING_SESSION_ID_REUSE); ret = -1; goto end; } s->server = 0; if (cb != NULL) cb(s, SSL_CB_HANDSHAKE_START, 1); /* s->version=TLS1_VERSION; */ s->type = SSL_ST_CONNECT; if (s->init_buf == NULL) { if ((buf = BUF_MEM_new()) == NULL) { ret = -1; goto end; } if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { ret = -1; goto end; } s->init_buf = buf; buf = NULL; } if (!ssl3_setup_buffers(s)) { ret = -1; goto end; } ssl3_init_finished_mac(s); s->state = SSL23_ST_CW_CLNT_HELLO_A; s->ctx->stats.sess_connect++; s->init_num = 0; break; case SSL23_ST_CW_CLNT_HELLO_A: case SSL23_ST_CW_CLNT_HELLO_B: s->shutdown = 0; ret = ssl23_client_hello(s); if (ret <= 0) goto end; s->state = SSL23_ST_CR_SRVR_HELLO_A; s->init_num = 0; break; case SSL23_ST_CR_SRVR_HELLO_A: case SSL23_ST_CR_SRVR_HELLO_B: ret = ssl23_get_server_hello(s); if (ret >= 0) cb = NULL; goto end; /* break; */ default: SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE); ret = -1; goto end; /* break; */ } if (s->debug) { (void)BIO_flush(s->wbio); } if ((cb != NULL) && (s->state != state)) { new_state = s->state; s->state = state; cb(s, SSL_CB_CONNECT_LOOP, 1); s->state = new_state; } } end: s->in_handshake--; if (buf != NULL) BUF_MEM_free(buf); if (cb != NULL) cb(s, SSL_CB_CONNECT_EXIT, ret); return (ret); } static int ssl23_client_hello(SSL *s) { unsigned char *buf; unsigned char *p, *d; int i; unsigned long l; int version = 0, version_major, version_minor; int ret; unsigned long mask, options = s->options; /* * SSL_OP_NO_X disables all protocols above X *if* there are * some protocols below X enabled. This is required in order * to maintain "version capability" vector contiguous. So * that if application wants to disable TLS1.0 in favour of * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. */ mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3; version = TLS1_2_VERSION; if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) version = TLS1_1_VERSION; mask &= ~SSL_OP_NO_TLSv1_1; if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) version = TLS1_VERSION; mask &= ~SSL_OP_NO_TLSv1; if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) version = SSL3_VERSION; mask &= ~SSL_OP_NO_SSLv3; buf = (unsigned char *)s->init_buf->data; if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { p = s->s3->client_random; RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE); if (version == TLS1_2_VERSION) { version_major = TLS1_2_VERSION_MAJOR; version_minor = TLS1_2_VERSION_MINOR; } else if (version == TLS1_1_VERSION) { version_major = TLS1_1_VERSION_MAJOR; version_minor = TLS1_1_VERSION_MINOR; } else if (version == TLS1_VERSION) { version_major = TLS1_VERSION_MAJOR; version_minor = TLS1_VERSION_MINOR; } else if (version == SSL3_VERSION) { version_major = SSL3_VERSION_MAJOR; version_minor = SSL3_VERSION_MINOR; } else { SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE); return (-1); } s->client_version = version; /* create Client Hello in SSL 3.0/TLS 1.0 format */ /* * Do the record header (5 bytes) and handshake * message header (4 bytes) last */ d = p = &(buf[9]); *(p++) = version_major; *(p++) = version_minor; /* Random stuff */ memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); p += SSL3_RANDOM_SIZE; /* Session ID (zero since there is no reuse) */ *(p++) = 0; /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), ssl3_put_cipher_by_char); if (i == 0) { SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); return -1; } #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH /* * Some servers hang if client hello > 256 bytes * as hack workaround chop number of supported ciphers * to keep it well below this if we use TLS v1.2 */ if (TLS1_get_version(s) >= TLS1_2_VERSION && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; #endif s2n(i, p); p += i; /* add in (no) COMPRESSION */ *(p++) = 1; /* Add the NULL method */ *(p++) = 0; /* TLS extensions*/ if (ssl_prepare_clienthello_tlsext(s) <= 0) { SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); return -1; } if ((p = ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) { SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return -1; } l = p - d; /* fill in 4-byte handshake header */ d = &(buf[5]); *(d++) = SSL3_MT_CLIENT_HELLO; l2n3(l, d); l += 4; if (l > SSL3_RT_MAX_PLAIN_LENGTH) { SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return -1; } /* fill in 5-byte record header */ d = buf; *(d++) = SSL3_RT_HANDSHAKE; *(d++) = version_major; /* * Some servers hang if we use long client hellos * and a record number > TLS 1.0. */ if (TLS1_get_client_version(s) > TLS1_VERSION) *(d++) = 1; else *(d++) = version_minor; s2n((int)l, d); /* number of bytes to write */ s->init_num = p - buf; s->init_off = 0; ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); s->state = SSL23_ST_CW_CLNT_HELLO_B; s->init_off = 0; } /* SSL3_ST_CW_CLNT_HELLO_B */ ret = ssl23_write_bytes(s); if ((ret >= 2) && s->msg_callback) { /* Client Hello has been sent; tell msg_callback */ s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data + 5, ret - 5, s, s->msg_callback_arg); } return ret; } static int ssl23_get_server_hello(SSL *s) { char buf[8]; unsigned char *p; int i; int n; n = ssl23_read_bytes(s, 7); if (n != 7) return (n); p = s->packet; memcpy(buf, p, n); /* Old unsupported sslv2 handshake */ if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && (p[5] == 0x00) && (p[6] == 0x02)) { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); goto err; } if (p[1] == SSL3_VERSION_MAJOR && p[2] <= TLS1_2_VERSION_MINOR && ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { /* we have sslv3 or tls1 (server hello or alert) */ if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { s->version = SSL3_VERSION; s->method = SSLv3_client_method(); } else if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { s->version = TLS1_VERSION; s->method = TLSv1_client_method(); } else if ((p[2] == TLS1_1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1_1)) { s->version = TLS1_1_VERSION; s->method = TLSv1_1_client_method(); } else if ((p[2] == TLS1_2_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1_2)) { s->version = TLS1_2_VERSION; s->method = TLSv1_2_client_method(); } else { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); goto err; } if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { /* fatal alert */ void (*cb)(const SSL *ssl, int type, int val) = NULL; int j; if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; i = p[5]; if (cb != NULL) { j = (i << 8) | p[6]; cb(s, SSL_CB_READ_ALERT, j); } if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, s->msg_callback_arg); s->rwstate = SSL_NOTHING; SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); goto err; } if (!ssl_init_wbio_buffer(s, 1)) goto err; /* we are in this state */ s->state = SSL3_ST_CR_SRVR_HELLO_A; /* put the 7 bytes we have read into the input buffer * for SSLv3 */ s->rstate = SSL_ST_READ_HEADER; s->packet_length = n; if (s->s3->rbuf.buf == NULL) if (!ssl3_setup_read_buffer(s)) goto err; s->packet = &(s->s3->rbuf.buf[0]); memcpy(s->packet, buf, n); s->s3->rbuf.left = n; s->s3->rbuf.offset = 0; s->handshake_func = s->method->ssl_connect; } else { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); goto err; } s->init_num = 0; /* * Since, if we are sending a ssl23 client hello, we are not * reusing a session-id */ if (!ssl_get_new_session(s, 0)) goto err; return (SSL_connect(s)); err: return (-1); }