/* ssl/s3_srvr.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) 1998-2001 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). * */ #define REUSE_CIPHER_BUG #define NETSCAPE_HANG_BUG #include #include #include #include #include #include #include #include "ssl_locl.h" #include "kssl_lcl.h" #include static SSL_METHOD *ssl3_get_server_method(int ver); static int ssl3_get_client_hello(SSL *s); static int ssl3_check_client_hello(SSL *s); static int ssl3_send_server_hello(SSL *s); static int ssl3_send_server_key_exchange(SSL *s); static int ssl3_send_certificate_request(SSL *s); static int ssl3_send_server_done(SSL *s); static int ssl3_get_client_key_exchange(SSL *s); static int ssl3_get_client_certificate(SSL *s); static int ssl3_get_cert_verify(SSL *s); static int ssl3_send_hello_request(SSL *s); static SSL_METHOD *ssl3_get_server_method(int ver) { if (ver == SSL3_VERSION) return(SSLv3_server_method()); else return(NULL); } SSL_METHOD *SSLv3_server_method(void) { static int init=1; static SSL_METHOD SSLv3_server_data; if (init) { memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(), sizeof(SSL_METHOD)); SSLv3_server_data.ssl_accept=ssl3_accept; SSLv3_server_data.get_ssl_method=ssl3_get_server_method; init=0; } return(&SSLv3_server_data); } int ssl3_accept(SSL *s) { BUF_MEM *buf; unsigned long l,Time=time(NULL); void (*cb)()=NULL; long num1; int ret= -1; int new_state,state,skip=0; int got_new_session=0; RAND_add(&Time,sizeof(Time),0); ERR_clear_error(); clear_sys_error(); if (s->info_callback != NULL) cb=s->info_callback; else if (s->ctx->info_callback != NULL) cb=s->ctx->info_callback; /* init things to blank */ s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); if (s->cert == NULL) { SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET); return(-1); } for (;;) { state=s->state; switch (s->state) { case SSL_ST_RENEGOTIATE: s->new_session=1; /* s->state=SSL_ST_ACCEPT; */ case SSL_ST_BEFORE: case SSL_ST_ACCEPT: case SSL_ST_BEFORE|SSL_ST_ACCEPT: case SSL_ST_OK|SSL_ST_ACCEPT: s->server=1; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); if ((s->version>>8) != 3) { SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR); return -1; } s->type=SSL_ST_ACCEPT; if (s->init_buf == NULL) { if ((buf=BUF_MEM_new()) == NULL) { ret= -1; goto end; } if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) { ret= -1; goto end; } s->init_buf=buf; } if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } s->init_num=0; if (s->state != SSL_ST_RENEGOTIATE) { /* Ok, we now need to push on a buffering BIO so that * the output is sent in a way that TCP likes :-) */ if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } ssl3_init_finished_mac(s); s->state=SSL3_ST_SR_CLNT_HELLO_A; s->ctx->stats.sess_accept++; } else { /* s->state == SSL_ST_RENEGOTIATE, * we will just send a HelloRequest */ s->ctx->stats.sess_accept_renegotiate++; s->state=SSL3_ST_SW_HELLO_REQ_A; } break; case SSL3_ST_SW_HELLO_REQ_A: case SSL3_ST_SW_HELLO_REQ_B: s->shutdown=0; ret=ssl3_send_hello_request(s); if (ret <= 0) goto end; s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; s->state=SSL3_ST_SW_FLUSH; s->init_num=0; ssl3_init_finished_mac(s); break; case SSL3_ST_SW_HELLO_REQ_C: s->state=SSL_ST_OK; break; case SSL3_ST_SR_CLNT_HELLO_A: case SSL3_ST_SR_CLNT_HELLO_B: case SSL3_ST_SR_CLNT_HELLO_C: s->shutdown=0; ret=ssl3_get_client_hello(s); if (ret <= 0) goto end; got_new_session=1; s->state=SSL3_ST_SW_SRVR_HELLO_A; s->init_num=0; break; case SSL3_ST_SW_SRVR_HELLO_A: case SSL3_ST_SW_SRVR_HELLO_B: ret=ssl3_send_server_hello(s); if (ret <= 0) goto end; if (s->hit) s->state=SSL3_ST_SW_CHANGE_A; else s->state=SSL3_ST_SW_CERT_A; s->init_num=0; break; case SSL3_ST_SW_CERT_A: case SSL3_ST_SW_CERT_B: /* Check if it is anon DH */ if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) { ret=ssl3_send_server_certificate(s); if (ret <= 0) goto end; } else skip=1; s->state=SSL3_ST_SW_KEY_EXCH_A; s->init_num=0; break; case SSL3_ST_SW_KEY_EXCH_A: case SSL3_ST_SW_KEY_EXCH_B: l=s->s3->tmp.new_cipher->algorithms; /* clear this, it may get reset by * send_server_key_exchange */ if ((s->options & SSL_OP_EPHEMERAL_RSA) #ifndef OPENSSL_NO_KRB5 && !(l & SSL_KRB5) #endif /* OPENSSL_NO_KRB5 */ ) /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key * even when forbidden by protocol specs * (handshake may fail as clients are not required to * be able to handle this) */ s->s3->tmp.use_rsa_tmp=1; else s->s3->tmp.use_rsa_tmp=0; /* only send if a DH key exchange, fortezza or * RSA but we have a sign only certificate */ if (s->s3->tmp.use_rsa_tmp || (l & (SSL_DH|SSL_kFZA)) || ((l & SSL_kRSA) && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) ) ) ) ) { ret=ssl3_send_server_key_exchange(s); if (ret <= 0) goto end; } else skip=1; s->state=SSL3_ST_SW_CERT_REQ_A; s->init_num=0; break; case SSL3_ST_SW_CERT_REQ_A: case SSL3_ST_SW_CERT_REQ_B: if (/* don't request cert unless asked for it: */ !(s->verify_mode & SSL_VERIFY_PEER) || /* if SSL_VERIFY_CLIENT_ONCE is set, * don't request cert during re-negotiation: */ ((s->session->peer != NULL) && (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || /* never request cert in anonymous ciphersuites * (see section "Certificate request" in SSL 3 drafts * and in RFC 2246): */ ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) && /* ... except when the application insists on verification * (against the specs, but s3_clnt.c accepts this for SSL 3) */ !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || /* never request cert in Kerberos ciphersuites */ (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) { /* no cert request */ skip=1; s->s3->tmp.cert_request=0; s->state=SSL3_ST_SW_SRVR_DONE_A; } else { s->s3->tmp.cert_request=1; ret=ssl3_send_certificate_request(s); if (ret <= 0) goto end; #ifndef NETSCAPE_HANG_BUG s->state=SSL3_ST_SW_SRVR_DONE_A; #else s->state=SSL3_ST_SW_FLUSH; s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; #endif s->init_num=0; } break; case SSL3_ST_SW_SRVR_DONE_A: case SSL3_ST_SW_SRVR_DONE_B: ret=ssl3_send_server_done(s); if (ret <= 0) goto end; s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; s->state=SSL3_ST_SW_FLUSH; s->init_num=0; break; case SSL3_ST_SW_FLUSH: /* number of bytes to be flushed */ num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL); if (num1 > 0) { s->rwstate=SSL_WRITING; num1=BIO_flush(s->wbio); if (num1 <= 0) { ret= -1; goto end; } s->rwstate=SSL_NOTHING; } s->state=s->s3->tmp.next_state; break; case SSL3_ST_SR_CERT_A: case SSL3_ST_SR_CERT_B: /* Check for second client hello (MS SGC) */ ret = ssl3_check_client_hello(s); if (ret <= 0) goto end; if (ret == 2) s->state = SSL3_ST_SR_CLNT_HELLO_C; else { /* could be sent for a DH cert, even if we * have not asked for it :-) */ ret=ssl3_get_client_certificate(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL3_ST_SR_KEY_EXCH_A; } break; case SSL3_ST_SR_KEY_EXCH_A: case SSL3_ST_SR_KEY_EXCH_B: ret=ssl3_get_client_key_exchange(s); if (ret <= 0) goto end; s->state=SSL3_ST_SR_CERT_VRFY_A; s->init_num=0; /* We need to get hashes here so if there is * a client cert, it can be verified */ s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst1), &(s->s3->tmp.cert_verify_md[0])); s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2), &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); break; case SSL3_ST_SR_CERT_VRFY_A: case SSL3_ST_SR_CERT_VRFY_B: /* we should decide if we expected this one */ ret=ssl3_get_cert_verify(s); if (ret <= 0) goto end; s->state=SSL3_ST_SR_FINISHED_A; s->init_num=0; break; case SSL3_ST_SR_FINISHED_A: case SSL3_ST_SR_FINISHED_B: ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B); if (ret <= 0) goto end; if (s->hit) s->state=SSL_ST_OK; else s->state=SSL3_ST_SW_CHANGE_A; s->init_num=0; break; case SSL3_ST_SW_CHANGE_A: case SSL3_ST_SW_CHANGE_B: s->session->cipher=s->s3->tmp.new_cipher; if (!s->method->ssl3_enc->setup_key_block(s)) { ret= -1; goto end; } ret=ssl3_send_change_cipher_spec(s, SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); if (ret <= 0) goto end; s->state=SSL3_ST_SW_FINISHED_A; s->init_num=0; if (!s->method->ssl3_enc->change_cipher_state(s, SSL3_CHANGE_CIPHER_SERVER_WRITE)) { ret= -1; goto end; } break; case SSL3_ST_SW_FINISHED_A: case SSL3_ST_SW_FINISHED_B: ret=ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, s->method->ssl3_enc->server_finished_label, s->method->ssl3_enc->server_finished_label_len); if (ret <= 0) goto end; s->state=SSL3_ST_SW_FLUSH; if (s->hit) s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; else s->s3->tmp.next_state=SSL_ST_OK; s->init_num=0; break; case SSL_ST_OK: /* clean a few things up */ ssl3_cleanup_key_block(s); BUF_MEM_free(s->init_buf); s->init_buf=NULL; /* remove buffering on output */ ssl_free_wbio_buffer(s); s->init_num=0; if (got_new_session) /* skipped if we just sent a HelloRequest */ { /* actually not necessarily a 'new' session unless * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ s->new_session=0; ssl_update_cache(s,SSL_SESS_CACHE_SERVER); s->ctx->stats.sess_accept_good++; /* s->server=1; */ s->handshake_func=ssl3_accept; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); } ret = 1; goto end; /* break; */ default: SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE); ret= -1; goto end; /* break; */ } if (!s->s3->tmp.reuse_message && !skip) { if (s->debug) { if ((ret=BIO_flush(s->wbio)) <= 0) goto end; } if ((cb != NULL) && (s->state != state)) { new_state=s->state; s->state=state; cb(s,SSL_CB_ACCEPT_LOOP,1); s->state=new_state; } } skip=0; } end: /* BIO_flush(s->wbio); */ s->in_handshake--; if (cb != NULL) cb(s,SSL_CB_ACCEPT_EXIT,ret); return(ret); } static int ssl3_send_hello_request(SSL *s) { unsigned char *p; if (s->state == SSL3_ST_SW_HELLO_REQ_A) { p=(unsigned char *)s->init_buf->data; *(p++)=SSL3_MT_HELLO_REQUEST; *(p++)=0; *(p++)=0; *(p++)=0; s->state=SSL3_ST_SW_HELLO_REQ_B; /* number of bytes to write */ s->init_num=4; s->init_off=0; } /* SSL3_ST_SW_HELLO_REQ_B */ return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); } static int ssl3_check_client_hello(SSL *s) { int ok; long n; /* this function is called when we really expect a Certificate message, * so permit appropriate message length */ n=ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, -1, s->max_cert_list, &ok); if (!ok) return((int)n); s->s3->tmp.reuse_message = 1; if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) { /* Throw away what we have done so far in the current handshake, * which will now be aborted. (A full SSL_clear would be too much.) * I hope that tmp.dh is the only thing that may need to be cleared * when a handshake is not completed ... */ #ifndef OPENSSL_NO_DH if (s->s3->tmp.dh != NULL) { DH_free(s->s3->tmp.dh); s->s3->tmp.dh = NULL; } #endif return 2; } return 1; } static int ssl3_get_client_hello(SSL *s) { int i,j,ok,al,ret= -1; long n; unsigned long id; unsigned char *p,*d,*q; SSL_CIPHER *c; SSL_COMP *comp=NULL; STACK_OF(SSL_CIPHER) *ciphers=NULL; /* We do this so that we will respond with our native type. * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, * This down switching should be handled by a different method. * If we are SSLv3, we will respond with SSLv3, even if prompted with * TLSv1. */ if (s->state == SSL3_ST_SR_CLNT_HELLO_A) { s->first_packet=1; s->state=SSL3_ST_SR_CLNT_HELLO_B; } n=ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, SSL3_RT_MAX_PLAIN_LENGTH, &ok); if (!ok) return((int)n); d=p=(unsigned char *)s->init_msg; /* use version from inside client hello, not from record header * (may differ: see RFC 2246, Appendix E, second paragraph) */ s->client_version=(((int)p[0])<<8)|(int)p[1]; p+=2; if (s->client_version < s->version) { SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER); if ((s->client_version>>8) == SSL3_VERSION_MAJOR) { /* similar to ssl3_get_record, send alert using remote version number */ s->version = s->client_version; } al = SSL_AD_PROTOCOL_VERSION; goto f_err; } /* load the client random */ memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE); p+=SSL3_RANDOM_SIZE; /* get the session-id */ j= *(p++); s->hit=0; /* Versions before 0.9.7 always allow session reuse during renegotiation * (i.e. when s->new_session is true), option * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7. * Maybe this optional behaviour should always have been the default, * but we cannot safely change the default behaviour (or new applications * might be written that become totally unsecure when compiled with * an earlier library version) */ if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { if (!ssl_get_new_session(s,1)) goto err; } else { i=ssl_get_prev_session(s,p,j); if (i == 1) { /* previous session */ s->hit=1; } else if (i == -1) goto err; else /* i == 0 */ { if (!ssl_get_new_session(s,1)) goto err; } } p+=j; n2s(p,i); if ((i == 0) && (j != 0)) { /* we need a cipher if we are not resuming a session */ al=SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED); goto f_err; } if ((i+p) > (d+n)) { /* not enough data */ al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH); goto f_err; } if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers)) == NULL)) { goto err; } p+=i; /* If it is a hit, check that the cipher is in the list */ if ((s->hit) && (i > 0)) { j=0; id=s->session->cipher->id; #ifdef CIPHER_DEBUG printf("client sent %d ciphers\n",sk_num(ciphers)); #endif for (i=0; iid == id) { j=1; break; } } if (j == 0) { if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1)) { /* Very bad for multi-threading.... */ s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0); } else { /* we need to have the cipher in the cipher * list if we are asked to reuse it */ al=SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING); goto f_err; } } } /* compression */ i= *(p++); q=p; for (j=0; j= i) { /* no compress */ al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED); goto f_err; } /* Worst case, we will use the NULL compression, but if we have other * options, we will now look for them. We have i-1 compression * algorithms from the client, starting at q. */ s->s3->tmp.new_compression=NULL; if (s->ctx->comp_methods != NULL) { /* See if we have a match */ int m,nn,o,v,done=0; nn=sk_SSL_COMP_num(s->ctx->comp_methods); for (m=0; mctx->comp_methods,m); v=comp->id; for (o=0; os3->tmp.new_compression=comp; else comp=NULL; } /* TLS does not mind if there is extra stuff */ if (s->version == SSL3_VERSION) { if (p > (d+n)) { /* wrong number of bytes, * there could be more to follow */ al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH); goto f_err; } } /* Given s->session->ciphers and SSL_get_ciphers, we must * pick a cipher */ if (!s->hit) { s->session->compress_meth=(comp == NULL)?0:comp->id; if (s->session->ciphers != NULL) sk_SSL_CIPHER_free(s->session->ciphers); s->session->ciphers=ciphers; if (ciphers == NULL) { al=SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED); goto f_err; } ciphers=NULL; c=ssl3_choose_cipher(s,s->session->ciphers, SSL_get_ciphers(s)); if (c == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER); goto f_err; } s->s3->tmp.new_cipher=c; } else { /* Session-id reuse */ #ifdef REUSE_CIPHER_BUG STACK_OF(SSL_CIPHER) *sk; SSL_CIPHER *nc=NULL; SSL_CIPHER *ec=NULL; if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG) { sk=s->session->ciphers; for (i=0; ialgorithms & SSL_eNULL) nc=c; if (SSL_C_IS_EXPORT(c)) ec=c; } if (nc != NULL) s->s3->tmp.new_cipher=nc; else if (ec != NULL) s->s3->tmp.new_cipher=ec; else s->s3->tmp.new_cipher=s->session->cipher; } else #endif s->s3->tmp.new_cipher=s->session->cipher; } /* we now have the following setup. * client_random * cipher_list - our prefered list of ciphers * ciphers - the clients prefered list of ciphers * compression - basically ignored right now * ssl version is set - sslv3 * s->session - The ssl session has been setup. * s->hit - session reuse flag * s->tmp.new_cipher - the new cipher to use. */ ret=1; if (0) { f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); } err: if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers); return(ret); } static int ssl3_send_server_hello(SSL *s) { unsigned char *buf; unsigned char *p,*d; int i,sl; unsigned long l,Time; if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { buf=(unsigned char *)s->init_buf->data; p=s->s3->server_random; Time=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; /* Random stuff */ memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); p+=SSL3_RANDOM_SIZE; /* now in theory we have 3 options to sending back the * session id. If it is a re-use, we send back the * old session-id, if it is a new session, we send * back the new session-id or we send back a 0 length * session-id if we want it to be single use. * Currently I will not implement the '0' length session-id * 12-Jan-98 - I'll now support the '0' length stuff. */ if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) s->session->session_id_length=0; sl=s->session->session_id_length; *(p++)=sl; memcpy(p,s->session->session_id,sl); p+=sl; /* put the cipher */ i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); p+=i; /* put the compression method */ if (s->s3->tmp.new_compression == NULL) *(p++)=0; else *(p++)=s->s3->tmp.new_compression->id; /* do the header */ l=(p-d); d=buf; *(d++)=SSL3_MT_SERVER_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)); } static int ssl3_send_server_done(SSL *s) { unsigned char *p; if (s->state == SSL3_ST_SW_SRVR_DONE_A) { p=(unsigned char *)s->init_buf->data; /* do the header */ *(p++)=SSL3_MT_SERVER_DONE; *(p++)=0; *(p++)=0; *(p++)=0; s->state=SSL3_ST_SW_SRVR_DONE_B; /* number of bytes to write */ s->init_num=4; s->init_off=0; } /* SSL3_ST_CW_CLNT_HELLO_B */ return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); } static int ssl3_send_server_key_exchange(SSL *s) { #ifndef OPENSSL_NO_RSA unsigned char *q; int j,num; RSA *rsa; unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; unsigned int u; #endif #ifndef OPENSSL_NO_DH DH *dh=NULL,*dhp; #endif EVP_PKEY *pkey; unsigned char *p,*d; int al,i; unsigned long type; int n; CERT *cert; BIGNUM *r[4]; int nr[4],kn; BUF_MEM *buf; EVP_MD_CTX md_ctx; EVP_MD_CTX_init(&md_ctx); if (s->state == SSL3_ST_SW_KEY_EXCH_A) { type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK; cert=s->cert; buf=s->init_buf; r[0]=r[1]=r[2]=r[3]=NULL; n=0; #ifndef OPENSSL_NO_RSA if (type & SSL_kRSA) { rsa=cert->rsa_tmp; if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { rsa=s->cert->rsa_tmp_cb(s, SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); if(rsa == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); goto f_err; } RSA_up_ref(rsa); cert->rsa_tmp=rsa; } if (rsa == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); goto f_err; } r[0]=rsa->n; r[1]=rsa->e; s->s3->tmp.use_rsa_tmp=1; } else #endif #ifndef OPENSSL_NO_DH if (type & SSL_kEDH) { dhp=cert->dh_tmp; if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) dhp=s->cert->dh_tmp_cb(s, SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); if (dhp == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); goto f_err; } if (s->s3->tmp.dh != NULL) { DH_free(dh); SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } if ((dh=DHparams_dup(dhp)) == NULL) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } s->s3->tmp.dh=dh; if ((dhp->pub_key == NULL || dhp->priv_key == NULL || (s->options & SSL_OP_SINGLE_DH_USE))) { if(!DH_generate_key(dh)) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); goto err; } } else { dh->pub_key=BN_dup(dhp->pub_key); dh->priv_key=BN_dup(dhp->priv_key); if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } } r[0]=dh->p; r[1]=dh->g; r[2]=dh->pub_key; } else #endif { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); goto f_err; } for (i=0; r[i] != NULL; i++) { nr[i]=BN_num_bytes(r[i]); n+=2+nr[i]; } if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) { if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) == NULL) { al=SSL_AD_DECODE_ERROR; goto f_err; } kn=EVP_PKEY_size(pkey); } else { pkey=NULL; kn=0; } if (!BUF_MEM_grow(buf,n+4+kn)) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); goto err; } d=(unsigned char *)s->init_buf->data; p= &(d[4]); for (i=0; r[i] != NULL; i++) { s2n(nr[i],p); BN_bn2bin(r[i],p); p+=nr[i]; } /* not anonymous */ if (pkey != NULL) { /* n is the length of the params, they start at &(d[4]) * and p points to the space at the end. */ #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA) { q=md_buf; j=0; for (num=2; num > 0; num--) { EVP_DigestInit_ex(&md_ctx,(num == 2) ?s->ctx->md5:s->ctx->sha1, NULL); EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md_ctx,&(d[4]),n); EVP_DigestFinal_ex(&md_ctx,q, (unsigned int *)&i); q+=i; j+=i; } if (RSA_sign(NID_md5_sha1, md_buf, j, &(p[2]), &u, pkey->pkey.rsa) <= 0) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); goto err; } s2n(u,p); n+=u+2; } else #endif #if !defined(OPENSSL_NO_DSA) if (pkey->type == EVP_PKEY_DSA) { /* lets do DSS */ EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); EVP_SignUpdate(&md_ctx,&(d[4]),n); if (!EVP_SignFinal(&md_ctx,&(p[2]), (unsigned int *)&i,pkey)) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); goto err; } s2n(i,p); n+=i+2; } else #endif { /* Is this error check actually needed? */ al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); goto f_err; } } *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE; l2n3(n,d); /* we should now have things packed up, so lets send * it off */ s->init_num=n+4; s->init_off=0; } s->state = SSL3_ST_SW_KEY_EXCH_B; EVP_MD_CTX_cleanup(&md_ctx); return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); err: EVP_MD_CTX_cleanup(&md_ctx); return(-1); } static int ssl3_send_certificate_request(SSL *s) { unsigned char *p,*d; int i,j,nl,off,n; STACK_OF(X509_NAME) *sk=NULL; X509_NAME *name; BUF_MEM *buf; if (s->state == SSL3_ST_SW_CERT_REQ_A) { buf=s->init_buf; d=p=(unsigned char *)&(buf->data[4]); /* get the list of acceptable cert types */ p++; n=ssl3_get_req_cert_type(s,p); d[0]=n; p+=n; n++; off=n; p+=2; n+=2; sk=SSL_get_client_CA_list(s); nl=0; if (sk != NULL) { for (i=0; idata[4+n]); if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) { s2n(j,p); i2d_X509_NAME(name,&p); n+=2+j; nl+=2+j; } else { d=p; i2d_X509_NAME(name,&p); j-=2; s2n(j,d); j+=2; n+=j; nl+=j; } } } /* else no CA names */ p=(unsigned char *)&(buf->data[4+off]); s2n(nl,p); d=(unsigned char *)buf->data; *(d++)=SSL3_MT_CERTIFICATE_REQUEST; l2n3(n,d); /* we should now have things packed up, so lets send * it off */ s->init_num=n+4; s->init_off=0; #ifdef NETSCAPE_HANG_BUG p=(unsigned char *)s->init_buf->data + s->init_num; /* do the header */ *(p++)=SSL3_MT_SERVER_DONE; *(p++)=0; *(p++)=0; *(p++)=0; s->init_num += 4; #endif } /* SSL3_ST_SW_CERT_REQ_B */ return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); err: return(-1); } static int ssl3_get_client_key_exchange(SSL *s) { int i,al,ok; long n; unsigned long l; unsigned char *p; #ifndef OPENSSL_NO_RSA RSA *rsa=NULL; EVP_PKEY *pkey=NULL; #endif #ifndef OPENSSL_NO_DH BIGNUM *pub=NULL; DH *dh_srvr; #endif #ifndef OPENSSL_NO_KRB5 KSSL_ERR kssl_err; #endif /* OPENSSL_NO_KRB5 */ n=ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, /* ??? */ &ok); if (!ok) return((int)n); p=(unsigned char *)s->init_msg; l=s->s3->tmp.new_cipher->algorithms; #ifndef OPENSSL_NO_RSA if (l & SSL_kRSA) { /* FIX THIS UP EAY EAY EAY EAY */ if (s->s3->tmp.use_rsa_tmp) { if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL)) rsa=s->cert->rsa_tmp; /* Don't do a callback because rsa_tmp should * be sent already */ if (rsa == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY); goto f_err; } } else { pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; if ( (pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE); goto f_err; } rsa=pkey->pkey.rsa; } /* TLS */ if (s->version > SSL3_VERSION) { n2s(p,i); if (n != i+2) { if (!(s->options & SSL_OP_TLS_D5_BUG)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); goto err; } else p-=2; } else n=i; } i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING); al = -1; if (i != SSL_MAX_MASTER_KEY_LENGTH) { al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); } if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff)))) { /* The premaster secret must contain the same version number as the * ClientHello to detect version rollback attacks (strangely, the * protocol does not offer such protection for DH ciphersuites). * However, buggy clients exist that send the negotiated protocol * version instead if the server does not support the requested * protocol version. * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */ if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) && (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff)))) { al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); goto f_err; } } if (al != -1) { #if 0 goto f_err; #else /* Some decryption failure -- use random value instead as countermeasure * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding * (see RFC 2246, section 7.4.7.1). * But note that due to length and protocol version checking, the * attack is impractical anyway (see section 5 in D. Bleichenbacher: * "Chosen Ciphertext Attacks Against Protocols Based on the RSA * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12). */ ERR_clear_error(); i = SSL_MAX_MASTER_KEY_LENGTH; p[0] = s->client_version >> 8; p[1] = s->client_version & 0xff; RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */ #endif } s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key, p,i); memset(p,0,i); } else #endif #ifndef OPENSSL_NO_DH if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) { n2s(p,i); if (n != i+2) { if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); goto err; } else { p-=2; i=(int)n; } } if (n == 0L) /* the parameters are in the cert */ { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS); goto f_err; } else { if (s->s3->tmp.dh == NULL) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); goto f_err; } else dh_srvr=s->s3->tmp.dh; } pub=BN_bin2bn(p,i,NULL); if (pub == NULL) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB); goto err; } i=DH_compute_key(p,pub,dh_srvr); if (i <= 0) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); goto err; } DH_free(s->s3->tmp.dh); s->s3->tmp.dh=NULL; BN_clear_free(pub); pub=NULL; s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key,p,i); memset(p,0,i); } else #endif #ifndef OPENSSL_NO_KRB5 if (l & SSL_kKRB5) { krb5_error_code krb5rc; krb5_data enc_ticket; krb5_data authenticator; krb5_data enc_pms; KSSL_CTX *kssl_ctx = s->kssl_ctx; EVP_CIPHER_CTX ciph_ctx; EVP_CIPHER *enc = NULL; unsigned char iv[EVP_MAX_IV_LENGTH]; unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH + 1]; int padl, outl = sizeof(pms); krb5_timestamp authtime = 0; krb5_ticket_times ttimes; if (!kssl_ctx) kssl_ctx = kssl_ctx_new(); n2s(p,i); enc_ticket.length = i; enc_ticket.data = p; p+=enc_ticket.length; n2s(p,i); authenticator.length = i; authenticator.data = p; p+=authenticator.length; n2s(p,i); enc_pms.length = i; enc_pms.data = p; p+=enc_pms.length; if ((unsigned long)n != enc_ticket.length + authenticator.length + enc_pms.length + 6) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); goto err; } if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes, &kssl_err)) != 0) { #ifdef KSSL_DEBUG printf("kssl_sget_tkt rtn %d [%d]\n", krb5rc, kssl_err.reason); if (kssl_err.text) printf("kssl_err text= %s\n", kssl_err.text); #endif /* KSSL_DEBUG */ SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); goto err; } /* Note: no authenticator is not considered an error, ** but will return authtime == 0. */ if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator, &authtime, &kssl_err)) != 0) { #ifdef KSSL_DEBUG printf("kssl_check_authent rtn %d [%d]\n", krb5rc, kssl_err.reason); if (kssl_err.text) printf("kssl_err text= %s\n", kssl_err.text); #endif /* KSSL_DEBUG */ SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); goto err; } if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0) { SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc); goto err; } #ifdef KSSL_DEBUG kssl_ctx_show(kssl_ctx); #endif /* KSSL_DEBUG */ enc = kssl_map_enc(kssl_ctx->enctype); if (enc == NULL) goto err; memset(iv, 0, EVP_MAX_IV_LENGTH); /* per RFC 1510 */ if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); goto err; } if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl, enc_pms.data, enc_pms.length)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); goto err; } if (outl > SSL_MAX_MASTER_KEY_LENGTH) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); goto err; } if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl)) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DECRYPTION_FAILED); goto err; } outl += padl; if (outl > SSL_MAX_MASTER_KEY_LENGTH) { SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); goto err; } EVP_CIPHER_CTX_cleanup(&ciph_ctx); s->session->master_key_length= s->method->ssl3_enc->generate_master_secret(s, s->session->master_key, pms, outl); if (kssl_ctx->client_princ) { int len = strlen(kssl_ctx->client_princ); if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) { s->session->krb5_client_princ_len = len; memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len); } } /* Was doing kssl_ctx_free() here, ** but it caused problems for apache. ** kssl_ctx = kssl_ctx_free(kssl_ctx); ** if (s->kssl_ctx) s->kssl_ctx = NULL; */ } else #endif /* OPENSSL_NO_KRB5 */ { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE); goto f_err; } return(1); f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) err: #endif return(-1); } static int ssl3_get_cert_verify(SSL *s) { EVP_PKEY *pkey=NULL; unsigned char *p; int al,ok,ret=0; long n; int type=0,i,j; X509 *peer; n=ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, SSL3_ST_SR_CERT_VRFY_B, -1, 512, /* 512? */ &ok); if (!ok) return((int)n); if (s->session->peer != NULL) { peer=s->session->peer; pkey=X509_get_pubkey(peer); type=X509_certificate_type(peer,pkey); } else { peer=NULL; pkey=NULL; } if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { s->s3->tmp.reuse_message=1; if ((peer != NULL) && (type | EVP_PKT_SIGN)) { al=SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE); goto f_err; } ret=1; goto end; } if (peer == NULL) { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED); al=SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } if (!(type & EVP_PKT_SIGN)) { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); al=SSL_AD_ILLEGAL_PARAMETER; goto f_err; } if (s->s3->change_cipher_spec) { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY); al=SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } /* we now have a signature that we need to verify */ p=(unsigned char *)s->init_msg; n2s(p,i); n-=2; if (i > n) { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH); al=SSL_AD_DECODE_ERROR; goto f_err; } j=EVP_PKEY_size(pkey); if ((i > j) || (n > j) || (n <= 0)) { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE); al=SSL_AD_DECODE_ERROR; goto f_err; } #ifndef OPENSSL_NO_RSA if (pkey->type == EVP_PKEY_RSA) { i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md, MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, pkey->pkey.rsa); if (i < 0) { al=SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT); goto f_err; } if (i == 0) { al=SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE); goto f_err; } } else #endif #ifndef OPENSSL_NO_DSA if (pkey->type == EVP_PKEY_DSA) { j=DSA_verify(pkey->save_type, &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa); if (j <= 0) { /* bad signature */ al=SSL_AD_DECRYPT_ERROR; SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE); goto f_err; } } else #endif { SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR); al=SSL_AD_UNSUPPORTED_CERTIFICATE; goto f_err; } ret=1; if (0) { f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); } end: EVP_PKEY_free(pkey); return(ret); } static int ssl3_get_client_certificate(SSL *s) { int i,ok,al,ret= -1; X509 *x=NULL; unsigned long l,nc,llen,n; unsigned char *p,*d,*q; STACK_OF(X509) *sk=NULL; n=ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, -1, s->max_cert_list, &ok); if (!ok) return((int)n); if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { if ( (s->verify_mode & SSL_VERIFY_PEER) && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); al=SSL_AD_HANDSHAKE_FAILURE; goto f_err; } /* If tls asked for a client cert, the client must return a 0 list */ if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST); al=SSL_AD_UNEXPECTED_MESSAGE; goto f_err; } 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_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE); goto f_err; } d=p=(unsigned char *)s->init_msg; if ((sk=sk_X509_new_null()) == NULL) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); goto err; } n2l3(p,llen); if (llen+3 != n) { al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH); goto f_err; } for (nc=0; nc llen) { al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } q=p; x=d2i_X509(NULL,&p,l); if (x == NULL) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB); goto err; } if (p != (q+l)) { al=SSL_AD_DECODE_ERROR; SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH); goto f_err; } if (!sk_X509_push(sk,x)) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE); goto err; } x=NULL; nc+=l+3; } if (sk_X509_num(sk) <= 0) { /* TLS does not mind 0 certs returned */ if (s->version == SSL3_VERSION) { al=SSL_AD_HANDSHAKE_FAILURE; SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED); goto f_err; } /* Fail for TLS only if we required a certificate */ else if ((s->verify_mode & SSL_VERIFY_PEER) && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); al=SSL_AD_HANDSHAKE_FAILURE; goto f_err; } } else { i=ssl_verify_cert_chain(s,sk); if (!i) { al=ssl_verify_alarm_type(s->verify_result); SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED); goto f_err; } } if (s->session->peer != NULL) /* This should not be needed */ X509_free(s->session->peer); s->session->peer=sk_X509_shift(sk); s->session->verify_result = s->verify_result; /* With the current implementation, sess_cert will always be NULL * when we arrive here. */ if (s->session->sess_cert == NULL) { s->session->sess_cert = ssl_sess_cert_new(); if (s->session->sess_cert == NULL) { SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE); goto err; } } if (s->session->sess_cert->cert_chain != NULL) sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free); s->session->sess_cert->cert_chain=sk; /* Inconsistency alert: cert_chain does *not* include the * peer's own certificate, while we do include it in s3_clnt.c */ sk=NULL; ret=1; if (0) { f_err: ssl3_send_alert(s,SSL3_AL_FATAL,al); } err: if (x != NULL) X509_free(x); if (sk != NULL) sk_X509_pop_free(sk,X509_free); return(ret); } int ssl3_send_server_certificate(SSL *s) { unsigned long l; X509 *x; if (s->state == SSL3_ST_SW_CERT_A) { x=ssl_get_server_send_cert(s); if (x == NULL && /* VRS: allow null cert if auth == KRB5 */ (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK)) != (SSL_aKRB5|SSL_kKRB5)) { SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); return(0); } l=ssl3_output_cert_chain(s,x); s->state=SSL3_ST_SW_CERT_B; s->init_num=(int)l; s->init_off=0; } /* SSL3_ST_SW_CERT_B */ return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); }