OpenSSL Security Advisory [30 July 2002]

[thirdparty/openssl.git] / ssl / s3_clnt.c

/* ssl/s3_clnt.c */
/* 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) 1998-2002 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 <stdio.h>
#include "ssl_locl.h"
#include "kssl_lcl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/md5.h>
#include "cryptlib.h"

static SSL_METHOD *ssl3_get_client_method(int ver);
static int ssl3_client_hello(SSL *s);
static int ssl3_get_server_hello(SSL *s);
static int ssl3_get_certificate_request(SSL *s);
static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
static int ssl3_get_server_done(SSL *s);
static int ssl3_send_client_verify(SSL *s);
static int ssl3_send_client_certificate(SSL *s);
static int ssl3_send_client_key_exchange(SSL *s);
static int ssl3_get_key_exchange(SSL *s);
static int ssl3_get_server_certificate(SSL *s);
static int ssl3_check_cert_and_algorithm(SSL *s);
static SSL_METHOD *ssl3_get_client_method(int ver)
        {
        if (ver == SSL3_VERSION)
                return(SSLv3_client_method());
        else
                return(NULL);
        }

SSL_METHOD *SSLv3_client_method(void)
        {
        static int init=1;
        static SSL_METHOD SSLv3_client_data;

        if (init)
                {
                init=0;
                memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
                        sizeof(SSL_METHOD));
                SSLv3_client_data.ssl_connect=ssl3_connect;
                SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
                }
        return(&SSLv3_client_data);
        }

int ssl3_connect(SSL *s)
        {
        BUF_MEM *buf;
        unsigned long Time=time(NULL),l;
        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 ) != 0x0300)
                                {
                                SSLerr(SSL_F_SSL3_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;
                                }

                        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 */

                        ssl3_init_finished_mac(s);

                        s->state=SSL3_ST_CW_CLNT_HELLO_A;
                        s->ctx->stats.sess_connect++;
                        s->init_num=0;
                        break;

                case SSL3_ST_CW_CLNT_HELLO_A:
                case SSL3_ST_CW_CLNT_HELLO_B:

                        s->shutdown=0;
                        ret=ssl3_client_hello(s);
                        if (ret <= 0) goto end;
                        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;
                        if (s->hit)
                                s->state=SSL3_ST_CR_FINISHED_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 */
                        if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
                                {
                                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:
                        ret=ssl3_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:
                        ret=ssl3_send_client_key_exchange(s);
                        if (ret <= 0) goto end;
                        l=s->s3->tmp.new_cipher->algorithms;
                        /* 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:
                        ret=ssl3_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:
                        ret=ssl3_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;
                        if (s->s3->tmp.new_compression == NULL)
                                s->session->compress_meth=0;
                        else
                                s->session->compress_meth=
                                        s->s3->tmp.new_compression->id;
                        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;
                                }

                        break;

                case SSL3_ST_CW_FINISHED_A:
                case SSL3_ST_CW_FINISHED_B:
                        ret=ssl3_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:

                        ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
                                SSL3_ST_CR_FINISHED_B);
                        if (ret <= 0) goto end;

                        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 (s->init_buf != NULL)
                                {
                                BUF_MEM_free(s->init_buf);
                                s->init_buf=NULL;
                                }

                        /* 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=ssl3_connect;
                        s->ctx->stats.sess_connect_good++;

                        if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);

                        goto end;
                        /* break; */
                        
                default:
                        SSLerr(SSL_F_SSL3_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 (cb != NULL)
                cb(s,SSL_CB_CONNECT_EXIT,ret);
        return(ret);
        }


static int ssl3_client_hello(SSL *s)
        {
        unsigned char *buf;
        unsigned char *p,*d;
        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;
                Time=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[4]);

                *(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)
                        {
                        die(i <= sizeof s->session->session_id);
                        memcpy(p,s->session->session_id,i);
                        p+=i;
                        }
                
                /* Ciphers supported */
                i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
                if (i == 0)
                        {
                        SSLerr(SSL_F_SSL3_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; i<j; i++)
                        {
                        comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
                        *(p++)=comp->id;
                        }
                *(p++)=0; /* Add the NULL method */
                
                l=(p-d);
                d=buf;
                *(d++)=SSL3_MT_CLIENT_HELLO;
                l2n3(l,d);

                s->state=SSL3_ST_CW_CLNT_HELLO_B;
                /* number of bytes to write */
                s->init_num=p-buf;
                s->init_off=0;
                }

        /* SSL3_ST_CW_CLNT_HELLO_B */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
        return(-1);
        }

static int ssl3_get_server_hello(SSL *s)
        {
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *c;
        unsigned char *p,*d;
        int i,al,ok;
        unsigned int j;
        long n;
        SSL_COMP *comp;

        n=ssl3_get_message(s,
                SSL3_ST_CR_SRVR_HELLO_A,
                SSL3_ST_CR_SRVR_HELLO_B,
                SSL3_MT_SERVER_HELLO,
                300, /* ?? */
                &ok);

        if (!ok) return((int)n);
        d=p=(unsigned char *)s->init_msg;

        if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
                s->version=(s->version&0xff00)|p[1];
                al=SSL_AD_PROTOCOL_VERSION;
                goto f_err;
                }
        p+=2;

        /* load the server hello data */
        /* load the server random */
        memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
        p+=SSL3_RANDOM_SIZE;

        /* get the session-id */
        j= *(p++);

       if(j > sizeof s->session->session_id)
               {
               al=SSL_AD_ILLEGAL_PARAMETER;
               SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
                      SSL_R_SSL3_SESSION_ID_TOO_LONG);
               goto f_err;
               }

        if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
                {
                /* SSLref returns 16 :-( */
                if (j < SSL2_SSL_SESSION_ID_LENGTH)
                        {
                        al=SSL_AD_ILLEGAL_PARAMETER;
                        SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
                        goto f_err;
                        }
                }
        if (j != 0 && j == s->session->session_id_length
            && memcmp(p,s->session->session_id,j) == 0)
            {
            if(s->sid_ctx_length != s->session->sid_ctx_length
               || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
                goto f_err;
                }
            s->hit=1;
            }
        else    /* a miss or crap from the other end */
                {
                /* If we were trying for session-id reuse, make a new
                 * SSL_SESSION so we don't stuff up other people */
                s->hit=0;
                if (s->session->session_id_length > 0)
                        {
                        if (!ssl_get_new_session(s,0))
                                {
                                al=SSL_AD_INTERNAL_ERROR;
                                goto f_err;
                                }
                        }
                s->session->session_id_length=j;
                memcpy(s->session->session_id,p,j); /* j could be 0 */
                }
        p+=j;
        c=ssl_get_cipher_by_char(s,p);
        if (c == NULL)
                {
                /* unknown cipher */
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
                goto f_err;
                }
        p+=ssl_put_cipher_by_char(s,NULL,NULL);

        sk=ssl_get_ciphers_by_id(s);
        i=sk_SSL_CIPHER_find(sk,c);
        if (i < 0)
                {
                /* we did not say we would use this cipher */
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
                goto f_err;
                }

        if (s->hit && (s->session->cipher != c))
                {
                if (!(s->options &
                        SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
                        {
                        al=SSL_AD_ILLEGAL_PARAMETER;
                        SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
                        goto f_err;
                        }
                }
        s->s3->tmp.new_cipher=c;

        /* lets get the compression algorithm */
        /* COMPRESSION */
        j= *(p++);
        if (j == 0)
                comp=NULL;
        else
                comp=ssl3_comp_find(s->ctx->comp_methods,j);
        
        if ((j != 0) && (comp == NULL))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
                goto f_err;
                }
        else
                {
                s->s3->tmp.new_compression=comp;
                }

        if (p != (d+n))
                {
                /* wrong packet length */
                al=SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
                goto err;
                }

        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        return(-1);
        }

static int ssl3_get_server_certificate(SSL *s)
        {
        int al,i,ok,ret= -1;
        unsigned long n,nc,llen,l;
        X509 *x=NULL;
        unsigned char *p,*d,*q;
        STACK_OF(X509) *sk=NULL;
        SESS_CERT *sc;
        EVP_PKEY *pkey=NULL;
        int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */

        n=ssl3_get_message(s,
                SSL3_ST_CR_CERT_A,
                SSL3_ST_CR_CERT_B,
                -1,
                s->max_cert_list,
                &ok);

        if (!ok) return((int)n);

        if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
                {
                s->s3->tmp.reuse_message=1;
                return(1);
                }

        if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
                {
                al=SSL_AD_UNEXPECTED_MESSAGE;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
                goto f_err;
                }
        d=p=(unsigned char *)s->init_msg;

        if ((sk=sk_X509_new_null()) == NULL)
                {
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
                goto err;
                }

        n2l3(p,llen);
        if (llen+3 != n)
                {
                al=SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
                goto f_err;
                }
        for (nc=0; nc<llen; )
                {
                n2l3(p,l);
                if ((l+nc+3) > llen)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
                        goto f_err;
                        }

                q=p;
                x=d2i_X509(NULL,&q,l);
                if (x == NULL)
                        {
                        al=SSL_AD_BAD_CERTIFICATE;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
                        goto f_err;
                        }
                if (q != (p+l))
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
                        goto f_err;
                        }
                if (!sk_X509_push(sk,x))
                        {
                        SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                x=NULL;
                nc+=l+3;
                p=q;
                }

        i=ssl_verify_cert_chain(s,sk);
        if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
#ifndef OPENSSL_NO_KRB5
                && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
                != (SSL_aKRB5|SSL_kKRB5)
#endif /* OPENSSL_NO_KRB5 */
                )
                {
                al=ssl_verify_alarm_type(s->verify_result);
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
                goto f_err; 
                }
        ERR_clear_error(); /* but we keep s->verify_result */

        sc=ssl_sess_cert_new();
        if (sc == NULL) goto err;

        if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
        s->session->sess_cert=sc;

        sc->cert_chain=sk;
        /* Inconsistency alert: cert_chain does include the peer's
         * certificate, which we don't include in s3_srvr.c */
        x=sk_X509_value(sk,0);
        sk=NULL;
        /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/

        pkey=X509_get_pubkey(x);

        /* VRS: allow null cert if auth == KRB5 */
        need_cert =     ((s->s3->tmp.new_cipher->algorithms
                        & (SSL_MKEY_MASK|SSL_AUTH_MASK))
                        == (SSL_aKRB5|SSL_kKRB5))? 0: 1;

#ifdef KSSL_DEBUG
        printf("pkey,x = %p, %p\n", pkey,x);
        printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
        printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
                s->s3->tmp.new_cipher->algorithms, need_cert);
#endif    /* KSSL_DEBUG */

        if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
                {
                x=NULL;
                al=SSL3_AL_FATAL;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
                        SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
                goto f_err;
                }

        i=ssl_cert_type(x,pkey);
        if (need_cert && i < 0)
                {
                x=NULL;
                al=SSL3_AL_FATAL;
                SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
                        SSL_R_UNKNOWN_CERTIFICATE_TYPE);
                goto f_err;
                }

        if (need_cert)
                {
                sc->peer_cert_type=i;
                CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
                /* Why would the following ever happen?
                 * We just created sc a couple of lines ago. */
                if (sc->peer_pkeys[i].x509 != NULL)
                        X509_free(sc->peer_pkeys[i].x509);
                sc->peer_pkeys[i].x509=x;
                sc->peer_key= &(sc->peer_pkeys[i]);

                if (s->session->peer != NULL)
                        X509_free(s->session->peer);
                CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
                s->session->peer=x;
                }
        else
                {
                sc->peer_cert_type=i;
                sc->peer_key= NULL;

                if (s->session->peer != NULL)
                        X509_free(s->session->peer);
                s->session->peer=NULL;
                }
        s->session->verify_result = s->verify_result;

        x=NULL;
        ret=1;

        if (0)
                {
f_err:
                ssl3_send_alert(s,SSL3_AL_FATAL,al);
                }
err:
        EVP_PKEY_free(pkey);
        X509_free(x);
        sk_X509_pop_free(sk,X509_free);
        return(ret);
        }

static int ssl3_get_key_exchange(SSL *s)
        {
#ifndef OPENSSL_NO_RSA
        unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
#endif
        EVP_MD_CTX md_ctx;
        unsigned char *param,*p;
        int al,i,j,param_len,ok;
        long n,alg;
        EVP_PKEY *pkey=NULL;
#ifndef OPENSSL_NO_RSA
        RSA *rsa=NULL;
#endif
#ifndef OPENSSL_NO_DH
        DH *dh=NULL;
#endif

        /* use same message size as in ssl3_get_certificate_request()
         * as ServerKeyExchange message may be skipped */
        n=ssl3_get_message(s,
                SSL3_ST_CR_KEY_EXCH_A,
                SSL3_ST_CR_KEY_EXCH_B,
                -1,
                s->max_cert_list,
                &ok);

        if (!ok) return((int)n);

        if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
                {
                s->s3->tmp.reuse_message=1;
                return(1);
                }

        param=p=(unsigned char *)s->init_msg;

        if (s->session->sess_cert != NULL)
                {
#ifndef OPENSSL_NO_RSA
                if (s->session->sess_cert->peer_rsa_tmp != NULL)
                        {
                        RSA_free(s->session->sess_cert->peer_rsa_tmp);
                        s->session->sess_cert->peer_rsa_tmp=NULL;
                        }
#endif
#ifndef OPENSSL_NO_DH
                if (s->session->sess_cert->peer_dh_tmp)
                        {
                        DH_free(s->session->sess_cert->peer_dh_tmp);
                        s->session->sess_cert->peer_dh_tmp=NULL;
                        }
#endif
                }
        else
                {
                s->session->sess_cert=ssl_sess_cert_new();
                }

        param_len=0;
        alg=s->s3->tmp.new_cipher->algorithms;
        EVP_MD_CTX_init(&md_ctx);

#ifndef OPENSSL_NO_RSA
        if (alg & SSL_kRSA)
                {
                if ((rsa=RSA_new()) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }
                n2s(p,i);
                param_len=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
                        goto f_err;
                        }
                if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
                        goto f_err;
                        }
                if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;
                n-=param_len;

                /* this should be because we are using an export cipher */
                if (alg & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
                else
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                s->session->sess_cert->peer_rsa_tmp=rsa;
                rsa=NULL;
                }
#else /* OPENSSL_NO_RSA */
        if (0)
                ;
#endif
#ifndef OPENSSL_NO_DH
        else if (alg & SSL_kEDH)
                {
                if ((dh=DH_new()) == NULL)
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
                        goto err;
                        }
                n2s(p,i);
                param_len=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
                        goto f_err;
                        }
                if (!(dh->p=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
                        goto f_err;
                        }
                if (!(dh->g=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;

                n2s(p,i);
                param_len+=i+2;
                if (param_len > n)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
                        goto f_err;
                        }
                if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
                        goto err;
                        }
                p+=i;
                n-=param_len;

#ifndef OPENSSL_NO_RSA
                if (alg & SSL_aRSA)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
#else
                if (0)
                        ;
#endif
#ifndef OPENSSL_NO_DSA
                else if (alg & SSL_aDSS)
                        pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
#endif
                /* else anonymous DH, so no certificate or pkey. */

                s->session->sess_cert->peer_dh_tmp=dh;
                dh=NULL;
                }
        else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
                {
                al=SSL_AD_ILLEGAL_PARAMETER;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
                goto f_err;
                }
#endif /* !OPENSSL_NO_DH */
        if (alg & SSL_aFZA)
                {
                al=SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
                goto f_err;
                }


        /* p points to the next byte, there are 'n' bytes left */


        /* if it was signed, check the signature */
        if (pkey != NULL)
                {
                n2s(p,i);
                n-=2;
                j=EVP_PKEY_size(pkey);

                if ((i != n) || (n > j) || (n <= 0))
                        {
                        /* wrong packet length */
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
                        goto f_err;
                        }

#ifndef OPENSSL_NO_RSA
                if (pkey->type == EVP_PKEY_RSA)
                        {
                        int num;

                        j=0;
                        q=md_buf;
                        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,param,param_len);
                                EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
                                q+=i;
                                j+=i;
                                }
                        i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
                                                                pkey->pkey.rsa);
                        if (i < 0)
                                {
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
                                goto f_err;
                                }
                        if (i == 0)
                                {
                                /* bad signature */
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
                                goto f_err;
                                }
                        }
                else
#endif
#ifndef OPENSSL_NO_DSA
                        if (pkey->type == EVP_PKEY_DSA)
                        {
                        /* lets do DSS */
                        EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
                        EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
                        EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
                        EVP_VerifyUpdate(&md_ctx,param,param_len);
                        if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
                                {
                                /* bad signature */
                                al=SSL_AD_DECRYPT_ERROR;
                                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
                                goto f_err;
                                }
                        }
                else
#endif
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                }
        else
                {
                /* still data left over */
                if (!(alg & SSL_aNULL))
                        {
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                if (n != 0)
                        {
                        al=SSL_AD_DECODE_ERROR;
                        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
                        goto f_err;
                        }
                }
        EVP_PKEY_free(pkey);
        EVP_MD_CTX_cleanup(&md_ctx);
        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
        EVP_PKEY_free(pkey);
#ifndef OPENSSL_NO_RSA
        if (rsa != NULL)
                RSA_free(rsa);
#endif
#ifndef OPENSSL_NO_DH
        if (dh != NULL)
                DH_free(dh);
#endif
        EVP_MD_CTX_cleanup(&md_ctx);
        return(-1);
        }

static int ssl3_get_certificate_request(SSL *s)
        {
        int ok,ret=0;
        unsigned long n,nc,l;
        unsigned int llen,ctype_num,i;
        X509_NAME *xn=NULL;
        unsigned char *p,*d,*q;
        STACK_OF(X509_NAME) *ca_sk=NULL;

        n=ssl3_get_message(s,
                SSL3_ST_CR_CERT_REQ_A,
                SSL3_ST_CR_CERT_REQ_B,
                -1,
                s->max_cert_list,
                &ok);

        if (!ok) return((int)n);

        s->s3->tmp.cert_req=0;

        if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
                {
                s->s3->tmp.reuse_message=1;
                return(1);
                }

        if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
                {
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
                goto err;
                }

        /* TLS does not like anon-DH with client cert */
        if (s->version > SSL3_VERSION)
                {
                l=s->s3->tmp.new_cipher->algorithms;
                if (l & SSL_aNULL)
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
                        goto err;
                        }
                }

        d=p=(unsigned char *)s->init_msg;

        if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
                {
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
                goto err;
                }

        /* get the certificate types */
        ctype_num= *(p++);
        if (ctype_num > SSL3_CT_NUMBER)
                ctype_num=SSL3_CT_NUMBER;
        for (i=0; i<ctype_num; i++)
                s->s3->tmp.ctype[i]= p[i];
        p+=ctype_num;

        /* get the CA RDNs */
        n2s(p,llen);
#if 0
{
FILE *out;
out=fopen("/tmp/vsign.der","w");
fwrite(p,1,llen,out);
fclose(out);
}
#endif

        if ((llen+ctype_num+2+1) != n)
                {
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
                goto err;
                }

        for (nc=0; nc<llen; )
                {
                n2s(p,l);
                if ((l+nc+2) > llen)
                        {
                        if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
                                goto cont; /* netscape bugs */
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
                        goto err;
                        }

                q=p;

                if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
                        {
                        /* If netscape tolerance is on, ignore errors */
                        if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
                                goto cont;
                        else
                                {
                                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                                SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
                                goto err;
                                }
                        }

                if (q != (p+l))
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
                        goto err;
                        }
                if (!sk_X509_NAME_push(ca_sk,xn))
                        {
                        SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
                        goto err;
                        }

                p+=l;
                nc+=l+2;
                }

        if (0)
                {
cont:
                ERR_clear_error();
                }

        /* we should setup a certificate to return.... */
        s->s3->tmp.cert_req=1;
        s->s3->tmp.ctype_num=ctype_num;
        if (s->s3->tmp.ca_names != NULL)
                sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
        s->s3->tmp.ca_names=ca_sk;
        ca_sk=NULL;

        ret=1;
err:
        if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
        return(ret);
        }

static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
        {
        return(X509_NAME_cmp(*a,*b));
        }

static int ssl3_get_server_done(SSL *s)
        {
        int ok,ret=0;
        long n;

        n=ssl3_get_message(s,
                SSL3_ST_CR_SRVR_DONE_A,
                SSL3_ST_CR_SRVR_DONE_B,
                SSL3_MT_SERVER_DONE,
                30, /* should be very small, like 0 :-) */
                &ok);

        if (!ok) return((int)n);
        if (n > 0)
                {
                /* should contain no data */
                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
                SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
                return -1;
                }
        ret=1;
        return(ret);
        }

static int ssl3_send_client_key_exchange(SSL *s)
        {
        unsigned char *p,*d;
        int n;
        unsigned long l;
#ifndef OPENSSL_NO_RSA
        unsigned char *q;
        EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_KRB5
        KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */

        if (s->state == SSL3_ST_CW_KEY_EXCH_A)
                {
                d=(unsigned char *)s->init_buf->data;
                p= &(d[4]);

                l=s->s3->tmp.new_cipher->algorithms;

                /* Fool emacs indentation */
                if (0) {}
#ifndef OPENSSL_NO_RSA
                else if (l & 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_SSL3_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]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
                                        goto err;

                        s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;

                        q=p;
                        /* Fix buf for TLS and beyond */
                        if (s->version > SSL3_VERSION)
                                p+=2;
                        n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
                                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_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
                                goto err;
                                }

                        /* Fix buf for TLS and beyond */
                        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,SSL_MAX_MASTER_KEY_LENGTH);
                        memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
                        }
#endif
#ifndef OPENSSL_NO_KRB5
                else if (l & 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;
                        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",
                                l, 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_SSL3_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 <sxw@sxw.org.uk>)
                        **  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,SSL_MAX_MASTER_KEY_LENGTH) <= 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, EVP_MAX_IV_LENGTH);  /* per RFC 1510 */
                        EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
                                kssl_ctx->key,iv);
                        EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
                                SSL_MAX_MASTER_KEY_LENGTH);
                        EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
                        outl += padl;
                        die(outl <= sizeof epms);
                        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, SSL_MAX_MASTER_KEY_LENGTH);

                        memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
                        memset(epms, 0, outl);
                        }
#endif
#ifndef OPENSSL_NO_DH
                else if (l & (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_SSL3_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_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
                                goto err;
                                }
                        if (!DH_generate_key(dh_clnt))
                                {
                                SSLerr(SSL_F_SSL3_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_SSL3_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
                else
                        {
                        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                
                *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
                l2n3(n,d);

                s->state=SSL3_ST_CW_KEY_EXCH_B;
                /* number of bytes to write */
                s->init_num=n+4;
                s->init_off=0;
                }

        /* SSL3_ST_CW_KEY_EXCH_B */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
        return(-1);
        }

static int ssl3_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;
#ifndef OPENSSL_NO_DSA
        int j;
#endif

        if (s->state == SSL3_ST_CW_CERT_VRFY_A)
                {
                d=(unsigned char *)s->init_buf->data;
                p= &(d[4]);
                pkey=s->cert->key->privatekey;

                s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
                        &(data[MD5_DIGEST_LENGTH]));

#ifndef OPENSSL_NO_RSA
                if (pkey->type == EVP_PKEY_RSA)
                        {
                        s->method->ssl3_enc->cert_verify_mac(s,
                                &(s->s3->finish_dgst1),&(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_SSL3_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_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
                                goto err;
                                }
                        s2n(j,p);
                        n=j+2;
                        }
                else
#endif
                        {
                        SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
                        goto err;
                        }
                *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
                l2n3(n,d);

                s->init_num=(int)n+4;
                s->init_off=0;
                }
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
        return(-1);
        }

static int ssl3_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;
                if (s->ctx->client_cert_cb != NULL)
                        i=s->ctx->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_SSL3_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=ssl3_output_cert_chain(s,
                        (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
                s->init_num=(int)l;
                s->init_off=0;
                }
        /* SSL3_ST_CW_CERT_D */
        return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
        }

#define has_bits(i,m)   (((i)&(m)) == (m))

static int ssl3_check_cert_and_algorithm(SSL *s)
        {
        int i,idx;
        long algs;
        EVP_PKEY *pkey=NULL;
        SESS_CERT *sc;
#ifndef OPENSSL_NO_RSA
        RSA *rsa;
#endif
#ifndef OPENSSL_NO_DH
        DH *dh;
#endif

        sc=s->session->sess_cert;

        if (sc == NULL)
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
                goto err;
                }

        algs=s->s3->tmp.new_cipher->algorithms;

        /* we don't have a certificate */
        if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
                return(1);

#ifndef OPENSSL_NO_RSA
        rsa=s->session->sess_cert->peer_rsa_tmp;
#endif
#ifndef OPENSSL_NO_DH
        dh=s->session->sess_cert->peer_dh_tmp;
#endif

        /* This is the passed certificate */

        idx=sc->peer_cert_type;
        pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
        i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
        EVP_PKEY_free(pkey);

        
        /* Check that we have a certificate if we require one */
        if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
                goto f_err;
                }
#ifndef OPENSSL_NO_DSA
        else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
                goto f_err;
                }
#endif
#ifndef OPENSSL_NO_RSA
        if ((algs & SSL_kRSA) &&
                !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
                goto f_err;
                }
#endif
#ifndef OPENSSL_NO_DH
        if ((algs & SSL_kEDH) &&
                !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
                goto f_err;
                }
        else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
                goto f_err;
                }
#ifndef OPENSSL_NO_DSA
        else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
                {
                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
                goto f_err;
                }
#endif
#endif

        if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
                {
#ifndef OPENSSL_NO_RSA
                if (algs & SSL_kRSA)
                        {
                        if (rsa == NULL
                            || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
                                {
                                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
                                goto f_err;
                                }
                        }
                else
#endif
#ifndef OPENSSL_NO_DH
                        if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
                            {
                            if (dh == NULL
                                || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
                                {
                                SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
                                goto f_err;
                                }
                        }
                else
#endif
                        {
                        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
                        goto f_err;
                        }
                }
        return(1);
f_err:
        ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
err:
        return(0);
        }