/* ssl/d1_clnt.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" #ifndef OPENSSL_NO_KRB5 #include "kssl_lcl.h" #endif #include #include #include #include #include #include #ifndef OPENSSL_NO_DH #include #endif static const SSL_METHOD *dtls1_get_client_method(int ver); static int dtls1_get_hello_verify(SSL *s); static const SSL_METHOD *dtls1_get_client_method(int ver) { if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) return(DTLSv1_client_method()); else return(NULL); } IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, ssl_undefined_function, dtls1_connect, dtls1_get_client_method) int dtls1_connect(SSL *s) { BUF_MEM *buf=NULL; unsigned long Time=(unsigned long)time(NULL); long num1; void (*cb)(const SSL *ssl,int type,int val)=NULL; 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; 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_RENEGOTIATE: s->new_session=1; s->state=SSL_ST_CONNECT; s->ctx->stats.sess_connect_renegotiate++; /* break */ case SSL_ST_BEFORE: case SSL_ST_CONNECT: case SSL_ST_BEFORE|SSL_ST_CONNECT: case SSL_ST_OK|SSL_ST_CONNECT: s->server=0; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) && (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00)) { SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); ret = -1; goto end; } /* s->version=SSL3_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; } /* setup buffing BIO */ if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } /* don't push the buffering BIO quite yet */ s->state=SSL3_ST_CW_CLNT_HELLO_A; s->ctx->stats.sess_connect++; s->init_num=0; /* mark client_random uninitialized */ memset(s->s3->client_random,0,sizeof(s->s3->client_random)); s->d1->send_cookie = 0; s->hit = 0; break; case SSL3_ST_CW_CLNT_HELLO_A: case SSL3_ST_CW_CLNT_HELLO_B: s->shutdown=0; /* every DTLS ClientHello resets Finished MAC */ ssl3_init_finished_mac(s); dtls1_start_timer(s); ret=dtls1_client_hello(s); if (ret <= 0) goto end; if ( s->d1->send_cookie) { s->state=SSL3_ST_CW_FLUSH; s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; } else s->state=SSL3_ST_CR_SRVR_HELLO_A; s->init_num=0; /* turn on buffering for the next lot of output */ if (s->bbio != s->wbio) s->wbio=BIO_push(s->bbio,s->wbio); break; case SSL3_ST_CR_SRVR_HELLO_A: case SSL3_ST_CR_SRVR_HELLO_B: ret=ssl3_get_server_hello(s); if (ret <= 0) goto end; else { dtls1_stop_timer(s); if (s->hit) s->state=SSL3_ST_CR_FINISHED_A; else s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; } s->init_num=0; break; case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: ret = dtls1_get_hello_verify(s); if ( ret <= 0) goto end; dtls1_stop_timer(s); if ( s->d1->send_cookie) /* start again, with a cookie */ s->state=SSL3_ST_CW_CLNT_HELLO_A; else s->state = SSL3_ST_CR_CERT_A; s->init_num = 0; break; case SSL3_ST_CR_CERT_A: case SSL3_ST_CR_CERT_B: /* Check if it is anon DH or PSK */ if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { ret=ssl3_get_server_certificate(s); if (ret <= 0) goto end; } else skip=1; s->state=SSL3_ST_CR_KEY_EXCH_A; s->init_num=0; break; case SSL3_ST_CR_KEY_EXCH_A: case SSL3_ST_CR_KEY_EXCH_B: ret=ssl3_get_key_exchange(s); if (ret <= 0) goto end; s->state=SSL3_ST_CR_CERT_REQ_A; s->init_num=0; /* at this point we check that we have the * required stuff from the server */ if (!ssl3_check_cert_and_algorithm(s)) { ret= -1; goto end; } break; case SSL3_ST_CR_CERT_REQ_A: case SSL3_ST_CR_CERT_REQ_B: ret=ssl3_get_certificate_request(s); if (ret <= 0) goto end; s->state=SSL3_ST_CR_SRVR_DONE_A; s->init_num=0; break; case SSL3_ST_CR_SRVR_DONE_A: case SSL3_ST_CR_SRVR_DONE_B: ret=ssl3_get_server_done(s); if (ret <= 0) goto end; if (s->s3->tmp.cert_req) s->state=SSL3_ST_CW_CERT_A; else s->state=SSL3_ST_CW_KEY_EXCH_A; s->init_num=0; break; case SSL3_ST_CW_CERT_A: case SSL3_ST_CW_CERT_B: case SSL3_ST_CW_CERT_C: case SSL3_ST_CW_CERT_D: dtls1_start_timer(s); ret=dtls1_send_client_certificate(s); if (ret <= 0) goto end; s->state=SSL3_ST_CW_KEY_EXCH_A; s->init_num=0; break; case SSL3_ST_CW_KEY_EXCH_A: case SSL3_ST_CW_KEY_EXCH_B: dtls1_start_timer(s); ret=dtls1_send_client_key_exchange(s); if (ret <= 0) goto end; /* EAY EAY EAY need to check for DH fix cert * sent back */ /* For TLS, cert_req is set to 2, so a cert chain * of nothing is sent, but no verify packet is sent */ if (s->s3->tmp.cert_req == 1) { s->state=SSL3_ST_CW_CERT_VRFY_A; } else { s->state=SSL3_ST_CW_CHANGE_A; s->s3->change_cipher_spec=0; } s->init_num=0; break; case SSL3_ST_CW_CERT_VRFY_A: case SSL3_ST_CW_CERT_VRFY_B: dtls1_start_timer(s); ret=dtls1_send_client_verify(s); if (ret <= 0) goto end; s->state=SSL3_ST_CW_CHANGE_A; s->init_num=0; s->s3->change_cipher_spec=0; break; case SSL3_ST_CW_CHANGE_A: case SSL3_ST_CW_CHANGE_B: dtls1_start_timer(s); ret=dtls1_send_change_cipher_spec(s, SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); if (ret <= 0) goto end; s->state=SSL3_ST_CW_FINISHED_A; s->init_num=0; s->session->cipher=s->s3->tmp.new_cipher; #ifdef OPENSSL_NO_COMP s->session->compress_meth=0; #else if (s->s3->tmp.new_compression == NULL) s->session->compress_meth=0; else s->session->compress_meth= s->s3->tmp.new_compression->id; #endif if (!s->method->ssl3_enc->setup_key_block(s)) { ret= -1; goto end; } if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { ret= -1; goto end; } dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); break; case SSL3_ST_CW_FINISHED_A: case SSL3_ST_CW_FINISHED_B: dtls1_start_timer(s); ret=dtls1_send_finished(s, SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, s->method->ssl3_enc->client_finished_label, s->method->ssl3_enc->client_finished_label_len); if (ret <= 0) goto end; s->state=SSL3_ST_CW_FLUSH; /* clear flags */ s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; if (s->hit) { s->s3->tmp.next_state=SSL_ST_OK; if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { s->state=SSL_ST_OK; s->s3->flags|=SSL3_FLAGS_POP_BUFFER; s->s3->delay_buf_pop_ret=0; } } else { s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; } s->init_num=0; break; case SSL3_ST_CR_FINISHED_A: case SSL3_ST_CR_FINISHED_B: s->d1->change_cipher_spec_ok = 1; ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, SSL3_ST_CR_FINISHED_B); if (ret <= 0) goto end; dtls1_stop_timer(s); if (s->hit) s->state=SSL3_ST_CW_CHANGE_A; else s->state=SSL_ST_OK; s->init_num=0; break; case SSL3_ST_CW_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 SSL_ST_OK: /* clean a few things up */ ssl3_cleanup_key_block(s); #if 0 if (s->init_buf != NULL) { BUF_MEM_free(s->init_buf); s->init_buf=NULL; } #endif /* If we are not 'joining' the last two packets, * remove the buffering now */ if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) ssl_free_wbio_buffer(s); /* else do it later in ssl3_write */ s->init_num=0; s->new_session=0; ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); if (s->hit) s->ctx->stats.sess_hit++; ret=1; /* s->server=0; */ s->handshake_func=dtls1_connect; s->ctx->stats.sess_connect_good++; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); /* done with handshaking */ s->d1->handshake_read_seq = 0; s->d1->next_handshake_write_seq = 0; goto end; /* break; */ default: SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); ret= -1; goto end; /* break; */ } /* did we do anything */ 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_CONNECT_LOOP,1); s->state=new_state; } } skip=0; } end: s->in_handshake--; if (buf != NULL) BUF_MEM_free(buf); if (cb != NULL) cb(s,SSL_CB_CONNECT_EXIT,ret); return(ret); } int dtls1_client_hello(SSL *s) { unsigned char *buf; unsigned char *p,*d; unsigned int i,j; unsigned long Time,l; SSL_COMP *comp; buf=(unsigned char *)s->init_buf->data; if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { if ((s->session == NULL) || (s->session->ssl_version != s->version) || (s->session->not_resumable)) { if (!ssl_get_new_session(s,0)) goto err; } /* else use the pre-loaded session */ p=s->s3->client_random; /* if client_random is initialized, reuse it, we are * required to use same upon reply to HelloVerify */ for (i=0;p[i]=='\0' && is3->client_random);i++) ; if (i==sizeof(s->s3->client_random)) { Time=(unsigned long)time(NULL); /* Time */ l2n(Time,p); RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); } /* Do the message type and length last */ d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); *(p++)=s->version>>8; *(p++)=s->version&0xff; s->client_version=s->version; /* Random stuff */ memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); p+=SSL3_RANDOM_SIZE; /* Session ID */ if (s->new_session) i=0; else i=s->session->session_id_length; *(p++)=i; if (i != 0) { if (i > sizeof s->session->session_id) { SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } memcpy(p,s->session->session_id,i); p+=i; } /* cookie stuff */ if ( s->d1->cookie_len > sizeof(s->d1->cookie)) { SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); goto err; } *(p++) = s->d1->cookie_len; memcpy(p, s->d1->cookie, s->d1->cookie_len); p += s->d1->cookie_len; /* Ciphers supported */ i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); if (i == 0) { SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); goto err; } s2n(i,p); p+=i; /* COMPRESSION */ if (s->ctx->comp_methods == NULL) j=0; else j=sk_SSL_COMP_num(s->ctx->comp_methods); *(p++)=1+j; for (i=0; ictx->comp_methods,i); *(p++)=comp->id; } *(p++)=0; /* Add the NULL method */ #ifndef OPENSSL_NO_TLSEXT if ((p = ssl_add_clienthello_dtlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) { SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); goto err; } #endif l=(p-d); d=buf; d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_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)); err: return(-1); } static int dtls1_get_hello_verify(SSL *s) { int n, al, ok = 0; unsigned char *data; unsigned int cookie_len; n=s->method->ssl_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->max_cert_list, &ok); if (!ok) return((int)n); if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { s->d1->send_cookie = 0; s->s3->tmp.reuse_message=1; return(1); } data = (unsigned char *)s->init_msg; if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) { SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); s->version=(s->version&0xff00)|data[1]; al = SSL_AD_PROTOCOL_VERSION; goto f_err; } data+=2; cookie_len = *(data++); if ( cookie_len > sizeof(s->d1->cookie)) { al=SSL_AD_ILLEGAL_PARAMETER; goto f_err; } memcpy(s->d1->cookie, data, cookie_len); s->d1->cookie_len = cookie_len; s->d1->send_cookie = 1; return 1; f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); return -1; } int dtls1_send_client_key_exchange(SSL *s) { unsigned char *p,*d; int n; unsigned long alg_k; #ifndef OPENSSL_NO_RSA unsigned char *q; EVP_PKEY *pkey=NULL; #endif #ifndef OPENSSL_NO_KRB5 KSSL_ERR kssl_err; #endif /* OPENSSL_NO_KRB5 */ #ifndef OPENSSL_NO_ECDH EC_KEY *clnt_ecdh = NULL; const EC_POINT *srvr_ecpoint = NULL; EVP_PKEY *srvr_pub_pkey = NULL; unsigned char *encodedPoint = NULL; int encoded_pt_len = 0; BN_CTX * bn_ctx = NULL; #endif if (s->state == SSL3_ST_CW_KEY_EXCH_A) { d=(unsigned char *)s->init_buf->data; p= &(d[DTLS1_HM_HEADER_LENGTH]); alg_k=s->s3->tmp.new_cipher->algorithm_mkey; /* Fool emacs indentation */ if (0) {} #ifndef OPENSSL_NO_RSA else if (alg_k & SSL_kRSA) { RSA *rsa; unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; if (s->session->sess_cert->peer_rsa_tmp != NULL) rsa=s->session->sess_cert->peer_rsa_tmp; else { pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); goto err; } rsa=pkey->pkey.rsa; EVP_PKEY_free(pkey); } tmp_buf[0]=s->client_version>>8; tmp_buf[1]=s->client_version&0xff; if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) goto err; s->session->master_key_length=sizeof tmp_buf; q=p; /* Fix buf for TLS and [incidentally] DTLS */ if (s->version > SSL3_VERSION) p+=2; n=RSA_public_encrypt(sizeof tmp_buf, tmp_buf,p,rsa,RSA_PKCS1_PADDING); #ifdef PKCS1_CHECK if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; #endif if (n <= 0) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); goto err; } /* Fix buf for TLS and [incidentally] DTLS */ if (s->version > SSL3_VERSION) { s2n(n,q); n+=2; } s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key, tmp_buf,sizeof tmp_buf); OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); } #endif #ifndef OPENSSL_NO_KRB5 else if (alg_k & SSL_kKRB5) { krb5_error_code krb5rc; KSSL_CTX *kssl_ctx = s->kssl_ctx; /* krb5_data krb5_ap_req; */ krb5_data *enc_ticket; krb5_data authenticator, *authp = NULL; EVP_CIPHER_CTX ciph_ctx; const EVP_CIPHER *enc = NULL; unsigned char iv[EVP_MAX_IV_LENGTH]; unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; int padl, outl = sizeof(epms); EVP_CIPHER_CTX_init(&ciph_ctx); #ifdef KSSL_DEBUG printf("ssl3_send_client_key_exchange(%lx & %lx)\n", alg_k, SSL_kKRB5); #endif /* KSSL_DEBUG */ authp = NULL; #ifdef KRB5SENDAUTH if (KRB5SENDAUTH) authp = &authenticator; #endif /* KRB5SENDAUTH */ krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); enc = kssl_map_enc(kssl_ctx->enctype); if (enc == NULL) goto err; #ifdef KSSL_DEBUG { printf("kssl_cget_tkt rtn %d\n", krb5rc); if (krb5rc && kssl_err.text) printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); } #endif /* KSSL_DEBUG */ if (krb5rc) { ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); goto err; } /* 20010406 VRS - Earlier versions used KRB5 AP_REQ ** in place of RFC 2712 KerberosWrapper, as in: ** ** Send ticket (copy to *p, set n = length) ** n = krb5_ap_req.length; ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); ** if (krb5_ap_req.data) ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); ** ** Now using real RFC 2712 KerberosWrapper ** (Thanks to Simon Wilkinson ) ** Note: 2712 "opaque" types are here replaced ** with a 2-byte length followed by the value. ** Example: ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms ** Where "xx xx" = length bytes. Shown here with ** optional authenticator omitted. */ /* KerberosWrapper.Ticket */ s2n(enc_ticket->length,p); memcpy(p, enc_ticket->data, enc_ticket->length); p+= enc_ticket->length; n = enc_ticket->length + 2; /* KerberosWrapper.Authenticator */ if (authp && authp->length) { s2n(authp->length,p); memcpy(p, authp->data, authp->length); p+= authp->length; n+= authp->length + 2; free(authp->data); authp->data = NULL; authp->length = 0; } else { s2n(0,p);/* null authenticator length */ n+=2; } if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) goto err; /* 20010420 VRS. Tried it this way; failed. ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, ** kssl_ctx->length); ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); */ memset(iv, 0, sizeof iv); /* per RFC 1510 */ EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, kssl_ctx->key,iv); EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, sizeof tmp_buf); EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); outl += padl; if (outl > (int)sizeof epms) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } EVP_CIPHER_CTX_cleanup(&ciph_ctx); /* KerberosWrapper.EncryptedPreMasterSecret */ s2n(outl,p); memcpy(p, epms, outl); p+=outl; n+=outl + 2; s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key, tmp_buf, sizeof tmp_buf); OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); OPENSSL_cleanse(epms, outl); } #endif #ifndef OPENSSL_NO_DH else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) { DH *dh_srvr,*dh_clnt; if (s->session->sess_cert->peer_dh_tmp != NULL) dh_srvr=s->session->sess_cert->peer_dh_tmp; else { /* we get them from the cert */ ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); goto err; } /* generate a new random key */ if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } if (!DH_generate_key(dh_clnt)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } /* use the 'p' output buffer for the DH key, but * make sure to clear it out afterwards */ n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); if (n <= 0) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } /* generate master key from the result */ s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key,p,n); /* clean up */ memset(p,0,n); /* send off the data */ n=BN_num_bytes(dh_clnt->pub_key); s2n(n,p); BN_bn2bin(dh_clnt->pub_key,p); n+=2; DH_free(dh_clnt); /* perhaps clean things up a bit EAY EAY EAY EAY*/ } #endif #ifndef OPENSSL_NO_ECDH else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) { const EC_GROUP *srvr_group = NULL; EC_KEY *tkey; int ecdh_clnt_cert = 0; int field_size = 0; /* Did we send out the client's * ECDH share for use in premaster * computation as part of client certificate? * If so, set ecdh_clnt_cert to 1. */ if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) { /* XXX: For now, we do not support client * authentication using ECDH certificates. * To add such support, one needs to add * code that checks for appropriate * conditions and sets ecdh_clnt_cert to 1. * For example, the cert have an ECC * key on the same curve as the server's * and the key should be authorized for * key agreement. * * One also needs to add code in ssl3_connect * to skip sending the certificate verify * message. * * if ((s->cert->key->privatekey != NULL) && * (s->cert->key->privatekey->type == * EVP_PKEY_EC) && ...) * ecdh_clnt_cert = 1; */ } if (s->session->sess_cert->peer_ecdh_tmp != NULL) { tkey = s->session->sess_cert->peer_ecdh_tmp; } else { /* Get the Server Public Key from Cert */ srvr_pub_pkey = X509_get_pubkey(s->session-> \ sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); if ((srvr_pub_pkey == NULL) || (srvr_pub_pkey->type != EVP_PKEY_EC) || (srvr_pub_pkey->pkey.ec == NULL)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } tkey = srvr_pub_pkey->pkey.ec; } srvr_group = EC_KEY_get0_group(tkey); srvr_ecpoint = EC_KEY_get0_public_key(tkey); if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if ((clnt_ecdh=EC_KEY_new()) == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); goto err; } if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); goto err; } if (ecdh_clnt_cert) { /* Reuse key info from our certificate * We only need our private key to perform * the ECDH computation. */ const BIGNUM *priv_key; tkey = s->cert->key->privatekey->pkey.ec; priv_key = EC_KEY_get0_private_key(tkey); if (priv_key == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); goto err; } if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); goto err; } } else { /* Generate a new ECDH key pair */ if (!(EC_KEY_generate_key(clnt_ecdh))) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } } /* use the 'p' output buffer for the ECDH key, but * make sure to clear it out afterwards */ field_size = EC_GROUP_get_degree(srvr_group); if (field_size <= 0) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); if (n <= 0) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); goto err; } /* generate master key from the result */ s->session->master_key_length = s->method->ssl3_enc \ -> generate_master_secret(s, s->session->master_key, p, n); memset(p, 0, n); /* clean up */ if (ecdh_clnt_cert) { /* Send empty client key exch message */ n = 0; } else { /* First check the size of encoding and * allocate memory accordingly. */ encoded_pt_len = EC_POINT_point2oct(srvr_group, EC_KEY_get0_public_key(clnt_ecdh), POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); encodedPoint = (unsigned char *) OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); bn_ctx = BN_CTX_new(); if ((encodedPoint == NULL) || (bn_ctx == NULL)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); goto err; } /* Encode the public key */ n = EC_POINT_point2oct(srvr_group, EC_KEY_get0_public_key(clnt_ecdh), POINT_CONVERSION_UNCOMPRESSED, encodedPoint, encoded_pt_len, bn_ctx); *p = n; /* length of encoded point */ /* Encoded point will be copied here */ p += 1; /* copy the point */ memcpy((unsigned char *)p, encodedPoint, n); /* increment n to account for length field */ n += 1; } /* Free allocated memory */ BN_CTX_free(bn_ctx); if (encodedPoint != NULL) OPENSSL_free(encodedPoint); if (clnt_ecdh != NULL) EC_KEY_free(clnt_ecdh); EVP_PKEY_free(srvr_pub_pkey); } #endif /* !OPENSSL_NO_ECDH */ #ifndef OPENSSL_NO_PSK else if (alg_k & SSL_kPSK) { char identity[PSK_MAX_IDENTITY_LEN]; unsigned char *t = NULL; unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; unsigned int pre_ms_len = 0, psk_len = 0; int psk_err = 1; n = 0; if (s->psk_client_callback == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, SSL_R_PSK_NO_CLIENT_CB); goto err; } psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, identity, PSK_MAX_IDENTITY_LEN, psk_or_pre_ms, sizeof(psk_or_pre_ms)); if (psk_len > PSK_MAX_PSK_LEN) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto psk_err; } else if (psk_len == 0) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, SSL_R_PSK_IDENTITY_NOT_FOUND); goto psk_err; } /* create PSK pre_master_secret */ pre_ms_len = 2+psk_len+2+psk_len; t = psk_or_pre_ms; memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); s2n(psk_len, t); memset(t, 0, psk_len); t+=psk_len; s2n(psk_len, t); if (s->session->psk_identity_hint != NULL) OPENSSL_free(s->session->psk_identity_hint); s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); if (s->ctx->psk_identity_hint != NULL && s->session->psk_identity_hint == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto psk_err; } if (s->session->psk_identity != NULL) OPENSSL_free(s->session->psk_identity); s->session->psk_identity = BUF_strdup(identity); if (s->session->psk_identity == NULL) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); goto psk_err; } s->session->master_key_length = s->method->ssl3_enc->generate_master_secret(s, s->session->master_key, psk_or_pre_ms, pre_ms_len); n = strlen(identity); s2n(n, p); memcpy(p, identity, n); n+=2; psk_err = 0; psk_err: OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); if (psk_err != 0) { ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); goto err; } } #endif else { ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); goto err; } d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); /* *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; l2n3(n,d); l2n(s->d1->handshake_write_seq,d); s->d1->handshake_write_seq++; */ s->state=SSL3_ST_CW_KEY_EXCH_B; /* number of bytes to write */ s->init_num=n+DTLS1_HM_HEADER_LENGTH; s->init_off=0; /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* SSL3_ST_CW_KEY_EXCH_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); err: #ifndef OPENSSL_NO_ECDH BN_CTX_free(bn_ctx); if (encodedPoint != NULL) OPENSSL_free(encodedPoint); if (clnt_ecdh != NULL) EC_KEY_free(clnt_ecdh); EVP_PKEY_free(srvr_pub_pkey); #endif return(-1); } int dtls1_send_client_verify(SSL *s) { unsigned char *p,*d; unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; EVP_PKEY *pkey; #ifndef OPENSSL_NO_RSA unsigned u=0; #endif unsigned long n; #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) int j; #endif if (s->state == SSL3_ST_CW_CERT_VRFY_A) { d=(unsigned char *)s->init_buf->data; p= &(d[DTLS1_HM_HEADER_LENGTH]); pkey=s->cert->key->privatekey; s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, &(data[MD5_DIGEST_LENGTH])); #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA) { s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); if (RSA_sign(NID_md5_sha1, data, MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, &(p[2]), &u, pkey->pkey.rsa) <= 0 ) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); goto err; } s2n(u,p); n=u+2; } else #endif #ifndef OPENSSL_NO_DSA if (pkey->type == EVP_PKEY_DSA) { if (!DSA_sign(pkey->save_type, &(data[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH,&(p[2]), (unsigned int *)&j,pkey->pkey.dsa)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); goto err; } s2n(j,p); n=j+2; } else #endif #ifndef OPENSSL_NO_ECDSA if (pkey->type == EVP_PKEY_EC) { if (!ECDSA_sign(pkey->save_type, &(data[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH,&(p[2]), (unsigned int *)&j,pkey->pkey.ec)) { SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); goto err; } s2n(j,p); n=j+2; } else #endif { SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); goto err; } d = dtls1_set_message_header(s, d, SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; s->init_num=(int)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_CW_CERT_VRFY_B; } /* s->state = SSL3_ST_CW_CERT_VRFY_B */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); err: return(-1); } int dtls1_send_client_certificate(SSL *s) { X509 *x509=NULL; EVP_PKEY *pkey=NULL; int i; unsigned long l; if (s->state == SSL3_ST_CW_CERT_A) { if ((s->cert == NULL) || (s->cert->key->x509 == NULL) || (s->cert->key->privatekey == NULL)) s->state=SSL3_ST_CW_CERT_B; else s->state=SSL3_ST_CW_CERT_C; } /* We need to get a client cert */ if (s->state == SSL3_ST_CW_CERT_B) { /* If we get an error, we need to * ssl->rwstate=SSL_X509_LOOKUP; return(-1); * We then get retied later */ i=0; i = ssl_do_client_cert_cb(s, &x509, &pkey); if (i < 0) { s->rwstate=SSL_X509_LOOKUP; return(-1); } s->rwstate=SSL_NOTHING; if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { s->state=SSL3_ST_CW_CERT_B; if ( !SSL_use_certificate(s,x509) || !SSL_use_PrivateKey(s,pkey)) i=0; } else if (i == 1) { i=0; SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); } if (x509 != NULL) X509_free(x509); if (pkey != NULL) EVP_PKEY_free(pkey); if (i == 0) { if (s->version == SSL3_VERSION) { s->s3->tmp.cert_req=0; ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); return(1); } else { s->s3->tmp.cert_req=2; } } /* Ok, we have a cert */ s->state=SSL3_ST_CW_CERT_C; } if (s->state == SSL3_ST_CW_CERT_C) { s->state=SSL3_ST_CW_CERT_D; l=dtls1_output_cert_chain(s, (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); s->init_num=(int)l; s->init_off=0; /* set header called by dtls1_output_cert_chain() */ /* buffer the message to handle re-xmits */ dtls1_buffer_message(s, 0); } /* SSL3_ST_CW_CERT_D */ return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); }