/* ssl/d1_srvr.c */ /* * DTLS implementation written by Nagendra Modadugu * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */ /* ==================================================================== * Copyright (c) 1999-2007 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). * */ /* 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.] */ #include #include "ssl_locl.h" #include #include #include #include #include #include #include #ifndef OPENSSL_NO_DH #include #endif static const SSL_METHOD *dtls1_get_server_method(int ver); static int dtls1_send_hello_verify_request(SSL *s); static const SSL_METHOD *dtls1_get_server_method(int ver) { if (ver == DTLS1_VERSION) return(DTLSv1_server_method()); else return(NULL); } IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, dtls1_accept, ssl_undefined_function, dtls1_get_server_method) int dtls1_accept(SSL *s) { BUF_MEM *buf; unsigned long Time=(unsigned long)time(NULL); void (*cb)(const SSL *ssl,int type,int val)=NULL; long num1; unsigned long alg_k; int ret= -1; int new_state,state,skip=0; RAND_add(&Time,sizeof(Time),0); ERR_clear_error(); clear_sys_error(); if (s->info_callback != NULL) cb=s->info_callback; else if (s->ctx->info_callback != NULL) cb=s->ctx->info_callback; /* init things to blank */ s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); if (s->cert == NULL) { SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); return(-1); } for (;;) { state=s->state; switch (s->state) { case SSL_ST_RENEGOTIATE: s->new_session=1; /* s->state=SSL_ST_ACCEPT; */ case SSL_ST_BEFORE: case SSL_ST_ACCEPT: case SSL_ST_BEFORE|SSL_ST_ACCEPT: case SSL_ST_OK|SSL_ST_ACCEPT: s->server=1; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); return -1; } s->type=SSL_ST_ACCEPT; 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; } if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } s->init_num=0; if (s->state != SSL_ST_RENEGOTIATE) { /* Ok, we now need to push on a buffering BIO so that * the output is sent in a way that TCP likes :-) */ if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } ssl3_init_finished_mac(s); s->state=SSL3_ST_SR_CLNT_HELLO_A; s->ctx->stats.sess_accept++; } else { /* s->state == SSL_ST_RENEGOTIATE, * we will just send a HelloRequest */ s->ctx->stats.sess_accept_renegotiate++; s->state=SSL3_ST_SW_HELLO_REQ_A; } if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) s->d1->send_cookie = 1; else s->d1->send_cookie = 0; break; case SSL3_ST_SW_HELLO_REQ_A: case SSL3_ST_SW_HELLO_REQ_B: s->shutdown=0; ret=dtls1_send_hello_request(s); if (ret <= 0) goto end; s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; s->state=SSL3_ST_SW_FLUSH; s->init_num=0; ssl3_init_finished_mac(s); break; case SSL3_ST_SW_HELLO_REQ_C: s->state=SSL_ST_OK; break; case SSL3_ST_SR_CLNT_HELLO_A: case SSL3_ST_SR_CLNT_HELLO_B: case SSL3_ST_SR_CLNT_HELLO_C: s->shutdown=0; ret=ssl3_get_client_hello(s); if (ret <= 0) goto end; s->new_session = 2; if (s->d1->send_cookie) s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; else s->state = SSL3_ST_SW_SRVR_HELLO_A; s->init_num=0; break; case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: ret = dtls1_send_hello_verify_request(s); if ( ret <= 0) goto end; s->d1->send_cookie = 0; s->state=SSL3_ST_SW_FLUSH; s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; break; case SSL3_ST_SW_SRVR_HELLO_A: case SSL3_ST_SW_SRVR_HELLO_B: ret=dtls1_send_server_hello(s); if (ret <= 0) goto end; if (s->hit) s->state=SSL3_ST_SW_CHANGE_A; else s->state=SSL3_ST_SW_CERT_A; s->init_num=0; break; case SSL3_ST_SW_CERT_A: case SSL3_ST_SW_CERT_B: /* Check if it is anon DH */ if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) { ret=dtls1_send_server_certificate(s); if (ret <= 0) goto end; } else skip=1; s->state=SSL3_ST_SW_KEY_EXCH_A; s->init_num=0; break; case SSL3_ST_SW_KEY_EXCH_A: case SSL3_ST_SW_KEY_EXCH_B: alg_k = s->s3->tmp.new_cipher->algorithm_mkey; /* clear this, it may get reset by * send_server_key_exchange */ if ((s->options & SSL_OP_EPHEMERAL_RSA) #ifndef OPENSSL_NO_KRB5 && !(alg_k & SSL_kKRB5) #endif /* OPENSSL_NO_KRB5 */ ) /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key * even when forbidden by protocol specs * (handshake may fail as clients are not required to * be able to handle this) */ s->s3->tmp.use_rsa_tmp=1; else s->s3->tmp.use_rsa_tmp=0; /* only send if a DH key exchange or * RSA but we have a sign only certificate */ if (s->s3->tmp.use_rsa_tmp || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) || ((alg_k & SSL_kRSA) && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) ) ) ) ) { ret=dtls1_send_server_key_exchange(s); if (ret <= 0) goto end; } else skip=1; s->state=SSL3_ST_SW_CERT_REQ_A; s->init_num=0; break; case SSL3_ST_SW_CERT_REQ_A: case SSL3_ST_SW_CERT_REQ_B: if (/* don't request cert unless asked for it: */ !(s->verify_mode & SSL_VERIFY_PEER) || /* if SSL_VERIFY_CLIENT_ONCE is set, * don't request cert during re-negotiation: */ ((s->session->peer != NULL) && (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || /* never request cert in anonymous ciphersuites * (see section "Certificate request" in SSL 3 drafts * and in RFC 2246): */ ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && /* ... except when the application insists on verification * (against the specs, but s3_clnt.c accepts this for SSL 3) */ !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || /* never request cert in Kerberos ciphersuites */ (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) { /* no cert request */ skip=1; s->s3->tmp.cert_request=0; s->state=SSL3_ST_SW_SRVR_DONE_A; } else { s->s3->tmp.cert_request=1; ret=dtls1_send_certificate_request(s); if (ret <= 0) goto end; #ifndef NETSCAPE_HANG_BUG s->state=SSL3_ST_SW_SRVR_DONE_A; #else s->state=SSL3_ST_SW_FLUSH; s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; #endif s->init_num=0; } break; case SSL3_ST_SW_SRVR_DONE_A: case SSL3_ST_SW_SRVR_DONE_B: ret=dtls1_send_server_done(s); if (ret <= 0) goto end; s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; s->state=SSL3_ST_SW_FLUSH; s->init_num=0; break; case SSL3_ST_SW_FLUSH: /* number of bytes to be flushed */ num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); if (num1 > 0) { s->rwstate=SSL_WRITING; num1=BIO_flush(s->wbio); if (num1 <= 0) { ret= -1; goto end; } s->rwstate=SSL_NOTHING; } s->state=s->s3->tmp.next_state; break; case SSL3_ST_SR_CERT_A: case SSL3_ST_SR_CERT_B: /* Check for second client hello (MS SGC) */ ret = ssl3_check_client_hello(s); if (ret <= 0) goto end; if (ret == 2) s->state = SSL3_ST_SR_CLNT_HELLO_C; else { /* could be sent for a DH cert, even if we * have not asked for it :-) */ ret=ssl3_get_client_certificate(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL3_ST_SR_KEY_EXCH_A; } break; case SSL3_ST_SR_KEY_EXCH_A: case SSL3_ST_SR_KEY_EXCH_B: ret=ssl3_get_client_key_exchange(s); if (ret <= 0) goto end; s->state=SSL3_ST_SR_CERT_VRFY_A; s->init_num=0; /* We need to get hashes here so if there is * a client cert, it can be verified */ s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(s->s3->tmp.cert_verify_md[0])); s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); break; case SSL3_ST_SR_CERT_VRFY_A: case SSL3_ST_SR_CERT_VRFY_B: /* we should decide if we expected this one */ ret=ssl3_get_cert_verify(s); if (ret <= 0) goto end; s->state=SSL3_ST_SR_FINISHED_A; s->init_num=0; break; case SSL3_ST_SR_FINISHED_A: case SSL3_ST_SR_FINISHED_B: ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B); if (ret <= 0) goto end; if (s->hit) s->state=SSL_ST_OK; else s->state=SSL3_ST_SW_CHANGE_A; s->init_num=0; break; case SSL3_ST_SW_CHANGE_A: case SSL3_ST_SW_CHANGE_B: s->session->cipher=s->s3->tmp.new_cipher; if (!s->method->ssl3_enc->setup_key_block(s)) { ret= -1; goto end; } ret=dtls1_send_change_cipher_spec(s, SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); if (ret <= 0) goto end; s->state=SSL3_ST_SW_FINISHED_A; s->init_num=0; if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_SERVER_WRITE)) { ret= -1; goto end; } dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); break; case SSL3_ST_SW_FINISHED_A: case SSL3_ST_SW_FINISHED_B: ret=dtls1_send_finished(s, SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, s->method->ssl3_enc->server_finished_label, s->method->ssl3_enc->server_finished_label_len); if (ret <= 0) goto end; s->state=SSL3_ST_SW_FLUSH; if (s->hit) s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; else s->s3->tmp.next_state=SSL_ST_OK; s->init_num=0; break; case SSL_ST_OK: /* clean a few things up */ ssl3_cleanup_key_block(s); #if 0 BUF_MEM_free(s->init_buf); s->init_buf=NULL; #endif /* remove buffering on output */ ssl_free_wbio_buffer(s); s->init_num=0; if (s->new_session == 2) /* skipped if we just sent a HelloRequest */ { /* actually not necessarily a 'new' session unless * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ s->new_session=0; ssl_update_cache(s,SSL_SESS_CACHE_SERVER); s->ctx->stats.sess_accept_good++; /* s->server=1; */ s->handshake_func=dtls1_accept; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); } ret = 1; /* done handshaking, next message is client hello */ s->d1->handshake_read_seq = 0; /* next message is server hello */ s->d1->handshake_write_seq = 0; goto end; /* break; */ default: SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); ret= -1; goto end; /* break; */ } if (!s->s3->tmp.reuse_message && !skip) { if (s->debug) { if ((ret=BIO_flush(s->wbio)) <= 0) goto end; } if ((cb != NULL) && (s->state != state)) { new_state=s->state; s->state=state; cb(s,SSL_CB_ACCEPT_LOOP,1); s->state=new_state; } } skip=0; } end: /* BIO_flush(s->wbio); */ s->in_handshake--; if (cb != NULL) cb(s,SSL_CB_ACCEPT_EXIT,ret); return(ret); } int dtls1_send_hello_request(SSL *s) { unsigned char *p; if (s->state == SSL3_ST_SW_HELLO_REQ_A) { p=(unsigned char *)s->init_buf->data; p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); s->state=SSL3_ST_SW_HELLO_REQ_B; /* number of bytes to write */ s->init_num=DTLS1_HM_HEADER_LENGTH; s->init_off=0; /* no need to buffer this message, since there are no retransmit * requests for it */ } /* SSL3_ST_SW_HELLO_REQ_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); } int dtls1_send_hello_verify_request(SSL *s) { unsigned int msg_len; unsigned char *msg, *buf, *p; if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { buf = (unsigned char *)s->init_buf->data; msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); *(p++) = s->version >> 8; *(p++) = s->version & 0xFF; *(p++) = (unsigned char) s->d1->cookie_len; if (s->ctx->app_gen_cookie_cb != NULL && s->ctx->app_gen_cookie_cb(s, s->d1->cookie, &(s->d1->cookie_len)) == 0) { SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); return 0; } /* else the cookie is assumed to have * been initialized by the application */ memcpy(p, s->d1->cookie, s->d1->cookie_len); p += s->d1->cookie_len; msg_len = p - msg; dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; /* number of bytes to write */ s->init_num=p-buf; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); } int dtls1_send_server_hello(SSL *s) { unsigned char *buf; unsigned char *p,*d; int i; unsigned int sl; unsigned long l,Time; if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { buf=(unsigned char *)s->init_buf->data; p=s->s3->server_random; Time=(unsigned long)time(NULL); /* Time */ l2n(Time,p); RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time)); /* Do the message type and length last */ d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); *(p++)=s->version>>8; *(p++)=s->version&0xff; /* Random stuff */ memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); p+=SSL3_RANDOM_SIZE; /* now in theory we have 3 options to sending back the * session id. If it is a re-use, we send back the * old session-id, if it is a new session, we send * back the new session-id or we send back a 0 length * session-id if we want it to be single use. * Currently I will not implement the '0' length session-id * 12-Jan-98 - I'll now support the '0' length stuff. */ if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) s->session->session_id_length=0; sl=s->session->session_id_length; if (sl > sizeof s->session->session_id) { SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); return -1; } *(p++)=sl; memcpy(p,s->session->session_id,sl); p+=sl; /* put the cipher */ i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); p+=i; /* put the compression method */ #ifdef OPENSSL_NO_COMP *(p++)=0; #else if (s->s3->tmp.new_compression == NULL) *(p++)=0; else *(p++)=s->s3->tmp.new_compression->id; #endif /* do the header */ l=(p-d); d=buf; d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); s->state=SSL3_ST_CW_CLNT_HELLO_B; /* number of bytes to write */ s->init_num=p-buf; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* SSL3_ST_CW_CLNT_HELLO_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); } int dtls1_send_server_done(SSL *s) { unsigned char *p; if (s->state == SSL3_ST_SW_SRVR_DONE_A) { p=(unsigned char *)s->init_buf->data; /* do the header */ p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); s->state=SSL3_ST_SW_SRVR_DONE_B; /* number of bytes to write */ s->init_num=DTLS1_HM_HEADER_LENGTH; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* SSL3_ST_CW_CLNT_HELLO_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); } int dtls1_send_server_key_exchange(SSL *s) { #ifndef OPENSSL_NO_RSA unsigned char *q; int j,num; RSA *rsa; unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; unsigned int u; #endif #ifndef OPENSSL_NO_DH DH *dh=NULL,*dhp; #endif EVP_PKEY *pkey; unsigned char *p,*d; int al,i; unsigned long type; int n; CERT *cert; BIGNUM *r[4]; int nr[4],kn; BUF_MEM *buf; EVP_MD_CTX md_ctx; EVP_MD_CTX_init(&md_ctx); if (s->state == SSL3_ST_SW_KEY_EXCH_A) { type=s->s3->tmp.new_cipher->algorithm_mkey; cert=s->cert; buf=s->init_buf; r[0]=r[1]=r[2]=r[3]=NULL; n=0; #ifndef OPENSSL_NO_RSA if (type & SSL_kRSA) { rsa=cert->rsa_tmp; if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { rsa=s->cert->rsa_tmp_cb(s, SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); if(rsa == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); goto f_err; } RSA_up_ref(rsa); cert->rsa_tmp=rsa; } if (rsa == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); goto f_err; } r[0]=rsa->n; r[1]=rsa->e; s->s3->tmp.use_rsa_tmp=1; } else #endif #ifndef OPENSSL_NO_DH if (type & SSL_kEDH) { dhp=cert->dh_tmp; if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) dhp=s->cert->dh_tmp_cb(s, SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); if (dhp == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); goto f_err; } if (s->s3->tmp.dh != NULL) { DH_free(dh); SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if ((dh=DHparams_dup(dhp)) == NULL) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } s->s3->tmp.dh=dh; if ((dhp->pub_key == NULL || dhp->priv_key == NULL || (s->options & SSL_OP_SINGLE_DH_USE))) { if(!DH_generate_key(dh)) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); goto err; } } else { dh->pub_key=BN_dup(dhp->pub_key); dh->priv_key=BN_dup(dhp->priv_key); if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } } r[0]=dh->p; r[1]=dh->g; r[2]=dh->pub_key; } else #endif { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); goto f_err; } for (i=0; r[i] != NULL; i++) { nr[i]=BN_num_bytes(r[i]); n+=2+nr[i]; } if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)) { if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) == NULL) { al=SSL_AD_DECODE_ERROR; goto f_err; } kn=EVP_PKEY_size(pkey); } else { pkey=NULL; kn=0; } if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); goto err; } d=(unsigned char *)s->init_buf->data; p= &(d[DTLS1_HM_HEADER_LENGTH]); for (i=0; r[i] != NULL; i++) { s2n(nr[i],p); BN_bn2bin(r[i],p); p+=nr[i]; } /* not anonymous */ if (pkey != NULL) { /* n is the length of the params, they start at * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space * at the end. */ #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA) { q=md_buf; j=0; for (num=2; num > 0; num--) { EVP_DigestInit_ex(&md_ctx,(num == 2) ?s->ctx->md5:s->ctx->sha1, NULL); EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); EVP_DigestFinal_ex(&md_ctx,q, (unsigned int *)&i); q+=i; j+=i; } if (RSA_sign(NID_md5_sha1, md_buf, j, &(p[2]), &u, pkey->pkey.rsa) <= 0) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); goto err; } s2n(u,p); n+=u+2; } else #endif #if !defined(OPENSSL_NO_DSA) if (pkey->type == EVP_PKEY_DSA) { /* lets do DSS */ EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); if (!EVP_SignFinal(&md_ctx,&(p[2]), (unsigned int *)&i,pkey)) { SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); goto err; } s2n(i,p); n+=i+2; } else #endif { /* Is this error check actually needed? */ al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); goto f_err; } } d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); /* we should now have things packed up, so lets send * it off */ s->init_num=n+DTLS1_HM_HEADER_LENGTH; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } s->state = SSL3_ST_SW_KEY_EXCH_B; EVP_MD_CTX_cleanup(&md_ctx); return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); err: EVP_MD_CTX_cleanup(&md_ctx); return(-1); } int dtls1_send_certificate_request(SSL *s) { unsigned char *p,*d; int i,j,nl,off,n; STACK_OF(X509_NAME) *sk=NULL; X509_NAME *name; BUF_MEM *buf; if (s->state == SSL3_ST_SW_CERT_REQ_A) { buf=s->init_buf; d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); /* get the list of acceptable cert types */ p++; n=ssl3_get_req_cert_type(s,p); d[0]=n; p+=n; n++; off=n; p+=2; n+=2; sk=SSL_get_client_CA_list(s); nl=0; if (sk != NULL) { for (i=0; idata[DTLS1_HM_HEADER_LENGTH+n]); if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) { s2n(j,p); i2d_X509_NAME(name,&p); n+=2+j; nl+=2+j; } else { d=p; i2d_X509_NAME(name,&p); j-=2; s2n(j,d); j+=2; n+=j; nl+=j; } } } /* else no CA names */ p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); s2n(nl,p); d=(unsigned char *)buf->data; *(d++)=SSL3_MT_CERTIFICATE_REQUEST; l2n3(n,d); s2n(s->d1->handshake_write_seq,d); s->d1->handshake_write_seq++; /* we should now have things packed up, so lets send * it off */ s->init_num=n+DTLS1_HM_HEADER_LENGTH; s->init_off=0; #ifdef NETSCAPE_HANG_BUG /* XXX: what to do about this? */ p=(unsigned char *)s->init_buf->data + s->init_num; /* do the header */ *(p++)=SSL3_MT_SERVER_DONE; *(p++)=0; *(p++)=0; *(p++)=0; s->init_num += 4; #endif /* XDTLS: set message header ? */ /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); s->state = SSL3_ST_SW_CERT_REQ_B; } /* SSL3_ST_SW_CERT_REQ_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); err: return(-1); } int dtls1_send_server_certificate(SSL *s) { unsigned long l; X509 *x; if (s->state == SSL3_ST_SW_CERT_A) { x=ssl_get_server_send_cert(s); if (x == NULL) { /* VRS: allow null cert if auth == KRB5 */ if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) { SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); return(0); } } l=dtls1_output_cert_chain(s,x); s->state=SSL3_ST_SW_CERT_B; s->init_num=(int)l; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* SSL3_ST_SW_CERT_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); }