/* ssl/s2_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). * */ #include "ssl_locl.h" #ifndef OPENSSL_NO_SSL2 #include <stdio.h> #include <openssl/bio.h> #include <openssl/rand.h> #include <openssl/objects.h> #include <openssl/evp.h> static const SSL_METHOD *ssl2_get_server_method(int ver); static int get_client_master_key(SSL *s); static int get_client_hello(SSL *s); static int server_hello(SSL *s); static int get_client_finished(SSL *s); static int server_verify(SSL *s); static int server_finish(SSL *s); static int request_certificate(SSL *s); static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, unsigned char *to,int padding); #define BREAK break static const SSL_METHOD *ssl2_get_server_method(int ver) { if (ver == SSL2_VERSION) return(SSLv2_server_method()); else return(NULL); } IMPLEMENT_ssl2_meth_func(SSLv2_server_method, ssl2_accept, ssl_undefined_function, ssl2_get_server_method) int ssl2_accept(SSL *s) { unsigned long l=(unsigned long)time(NULL); BUF_MEM *buf=NULL; int ret= -1; long num1; void (*cb)(const SSL *ssl,int type,int val)=NULL; int new_state,state; RAND_add(&l,sizeof(l),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_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET); return(-1); } clear_sys_error(); for (;;) { state=s->state; switch (s->state) { 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); s->version=SSL2_VERSION; s->type=SSL_ST_ACCEPT; buf=s->init_buf; if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL)) { ret= -1; goto end; } if (!BUF_MEM_grow(buf,(int) SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { ret= -1; goto end; } s->init_buf=buf; s->init_num=0; s->ctx->stats.sess_accept++; s->handshake_func=ssl2_accept; s->state=SSL2_ST_GET_CLIENT_HELLO_A; BREAK; case SSL2_ST_GET_CLIENT_HELLO_A: case SSL2_ST_GET_CLIENT_HELLO_B: case SSL2_ST_GET_CLIENT_HELLO_C: s->shutdown=0; ret=get_client_hello(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL2_ST_SEND_SERVER_HELLO_A; BREAK; case SSL2_ST_SEND_SERVER_HELLO_A: case SSL2_ST_SEND_SERVER_HELLO_B: ret=server_hello(s); if (ret <= 0) goto end; s->init_num=0; if (!s->hit) { s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A; BREAK; } else { s->state=SSL2_ST_SERVER_START_ENCRYPTION; BREAK; } case SSL2_ST_GET_CLIENT_MASTER_KEY_A: case SSL2_ST_GET_CLIENT_MASTER_KEY_B: ret=get_client_master_key(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL2_ST_SERVER_START_ENCRYPTION; BREAK; case SSL2_ST_SERVER_START_ENCRYPTION: /* Ok we how have sent all the stuff needed to * start encrypting, the next packet back will * be encrypted. */ if (!ssl2_enc_init(s,0)) { ret= -1; goto end; } s->s2->clear_text=0; s->state=SSL2_ST_SEND_SERVER_VERIFY_A; BREAK; case SSL2_ST_SEND_SERVER_VERIFY_A: case SSL2_ST_SEND_SERVER_VERIFY_B: ret=server_verify(s); if (ret <= 0) goto end; s->init_num=0; if (s->hit) { /* If we are in here, we have been * buffering the output, so we need to * flush it and remove buffering from * future traffic */ s->state=SSL2_ST_SEND_SERVER_VERIFY_C; BREAK; } else { s->state=SSL2_ST_GET_CLIENT_FINISHED_A; break; } case SSL2_ST_SEND_SERVER_VERIFY_C: /* get the number of bytes to write */ 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; } /* flushed and now remove buffering */ s->wbio=BIO_pop(s->wbio); s->state=SSL2_ST_GET_CLIENT_FINISHED_A; BREAK; case SSL2_ST_GET_CLIENT_FINISHED_A: case SSL2_ST_GET_CLIENT_FINISHED_B: ret=get_client_finished(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A; BREAK; case SSL2_ST_SEND_REQUEST_CERTIFICATE_A: case SSL2_ST_SEND_REQUEST_CERTIFICATE_B: case SSL2_ST_SEND_REQUEST_CERTIFICATE_C: case SSL2_ST_SEND_REQUEST_CERTIFICATE_D: /* don't do a 'request certificate' if we * don't want to, or we already have one, and * we only want to do it once. */ if (!(s->verify_mode & SSL_VERIFY_PEER) || ((s->session->peer != NULL) && (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) { s->state=SSL2_ST_SEND_SERVER_FINISHED_A; break; } else { ret=request_certificate(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL2_ST_SEND_SERVER_FINISHED_A; } BREAK; case SSL2_ST_SEND_SERVER_FINISHED_A: case SSL2_ST_SEND_SERVER_FINISHED_B: ret=server_finish(s); if (ret <= 0) goto end; s->init_num=0; s->state=SSL_ST_OK; break; case SSL_ST_OK: BUF_MEM_free(s->init_buf); ssl_free_wbio_buffer(s); s->init_buf=NULL; s->init_num=0; /* ERR_clear_error();*/ ssl_update_cache(s,SSL_SESS_CACHE_SERVER); s->ctx->stats.sess_accept_good++; /* s->server=1; */ ret=1; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); goto end; /* BREAK; */ default: SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE); ret= -1; goto end; /* BREAK; */ } if ((cb != NULL) && (s->state != state)) { new_state=s->state; s->state=state; cb(s,SSL_CB_ACCEPT_LOOP,1); s->state=new_state; } } end: s->in_handshake--; if (cb != NULL) cb(s,SSL_CB_ACCEPT_EXIT,ret); return(ret); } static int get_client_master_key(SSL *s) { int is_export,i,n,keya,ek; unsigned long len; unsigned char *p; const SSL_CIPHER *cp; const EVP_CIPHER *c; const EVP_MD *md; p=(unsigned char *)s->init_buf->data; if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) { i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num); if (i < (10-s->init_num)) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i)); s->init_num = 10; if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) { if (p[-1] != SSL2_MT_ERROR) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE); } else SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR); return(-1); } cp=ssl2_get_cipher_by_char(p); if (cp == NULL) { ssl2_return_error(s,SSL2_PE_NO_CIPHER); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH); return(-1); } s->session->cipher= cp; p+=3; n2s(p,i); s->s2->tmp.clear=i; n2s(p,i); s->s2->tmp.enc=i; n2s(p,i); s->session->key_arg_length=i; if(s->session->key_arg_length > SSL_MAX_KEY_ARG_LENGTH) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG); return -1; } s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B; } /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */ p=(unsigned char *)s->init_buf->data; if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); return -1; } keya=s->session->key_arg_length; len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya; if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG); return -1; } n = (int)len - s->init_num; i = ssl2_read(s,(char *)&(p[s->init_num]),n); if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i)); if (s->msg_callback) s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */ p += 10; memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]), (unsigned int)keya); if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY); return(-1); } i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc, &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]), (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING); is_export=SSL_C_IS_EXPORT(s->session->cipher); if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL)) { ssl2_return_error(s,SSL2_PE_NO_CIPHER); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); return(0); } if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) { is_export=1; ek=8; } else ek=5; /* bad decrypt */ #if 1 /* If a bad decrypt, continue with protocol but with a * random master secret (Bleichenbacher attack) */ if ((i < 0) || ((!is_export && (i != EVP_CIPHER_key_length(c))) || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i != (unsigned int)EVP_CIPHER_key_length(c)))))) { ERR_clear_error(); if (is_export) i=ek; else i=EVP_CIPHER_key_length(c); if (RAND_pseudo_bytes(p,i) <= 0) return 0; } #else if (i < 0) { error=1; SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT); } /* incorrect number of key bytes for non export cipher */ else if ((!is_export && (i != EVP_CIPHER_key_length(c))) || (is_export && ((i != ek) || (s->s2->tmp.clear+i != EVP_CIPHER_key_length(c))))) { error=1; SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS); } if (error) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); return(-1); } #endif if (is_export) i+=s->s2->tmp.clear; if (i > SSL_MAX_MASTER_KEY_LENGTH) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); return -1; } s->session->master_key_length=i; memcpy(s->session->master_key,p,(unsigned int)i); return(1); } static int get_client_hello(SSL *s) { int i,n; unsigned long len; unsigned char *p; STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */ STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */ STACK_OF(SSL_CIPHER) *prio, *allow; int z; /* This is a bit of a hack to check for the correct packet * type the first time round. */ if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) { s->first_packet=1; s->state=SSL2_ST_GET_CLIENT_HELLO_B; } p=(unsigned char *)s->init_buf->data; if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) { i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num); if (i < (9-s->init_num)) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i)); s->init_num = 9; if (*(p++) != SSL2_MT_CLIENT_HELLO) { if (p[-1] != SSL2_MT_ERROR) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE); } else SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR); return(-1); } n2s(p,i); if (i < s->version) s->version=i; n2s(p,i); s->s2->tmp.cipher_spec_length=i; n2s(p,i); s->s2->tmp.session_id_length=i; n2s(p,i); s->s2->challenge_length=i; if ( (i < SSL2_MIN_CHALLENGE_LENGTH) || (i > SSL2_MAX_CHALLENGE_LENGTH)) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH); return(-1); } s->state=SSL2_ST_GET_CLIENT_HELLO_C; } /* SSL2_ST_GET_CLIENT_HELLO_C */ p=(unsigned char *)s->init_buf->data; len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length; if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG); return -1; } n = (int)len - s->init_num; i = ssl2_read(s,(char *)&(p[s->init_num]),n); if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i)); if (s->msg_callback) s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */ p += 9; /* get session-id before cipher stuff so we can get out session * structure if it is cached */ /* session-id */ if ((s->s2->tmp.session_id_length != 0) && (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH); return(-1); } if (s->s2->tmp.session_id_length == 0) { if (!ssl_get_new_session(s,1)) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); return(-1); } } else { i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]), s->s2->tmp.session_id_length, NULL); if (i == 1) { /* previous session */ s->hit=1; } else if (i == -1) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); return(-1); } else { if (s->cert == NULL) { ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE); SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET); return(-1); } if (!ssl_get_new_session(s,1)) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); return(-1); } } } if (!s->hit) { cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length, &s->session->ciphers); if (cs == NULL) goto mem_err; cl=SSL_get_ciphers(s); if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { prio=sk_SSL_CIPHER_dup(cl); if (prio == NULL) goto mem_err; allow = cs; } else { prio = cs; allow = cl; } for (z=0; z<sk_SSL_CIPHER_num(prio); z++) { if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0) { (void)sk_SSL_CIPHER_delete(prio,z); z--; } } if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { sk_SSL_CIPHER_free(s->session->ciphers); s->session->ciphers = prio; } /* s->session->ciphers should now have a list of * ciphers that are on both the client and server. * This list is ordered by the order the client sent * the ciphers or in the order of the server's preference * if SSL_OP_CIPHER_SERVER_PREFERENCE was set. */ } p+=s->s2->tmp.cipher_spec_length; /* done cipher selection */ /* session id extracted already */ p+=s->s2->tmp.session_id_length; /* challenge */ if (s->s2->challenge_length > sizeof s->s2->challenge) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); return -1; } memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length); return(1); mem_err: SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE); return(0); } static int server_hello(SSL *s) { unsigned char *p,*d; int n,hit; STACK_OF(SSL_CIPHER) *sk; p=(unsigned char *)s->init_buf->data; if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) { d=p+11; *(p++)=SSL2_MT_SERVER_HELLO; /* type */ hit=s->hit; *(p++)=(unsigned char)hit; #if 1 if (!hit) { if (s->session->sess_cert != NULL) /* This can't really happen because get_client_hello * has called ssl_get_new_session, which does not set * sess_cert. */ ssl_sess_cert_free(s->session->sess_cert); s->session->sess_cert = ssl_sess_cert_new(); if (s->session->sess_cert == NULL) { SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE); return(-1); } } /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL, * depending on whether it survived in the internal cache * or was retrieved from an external cache. * If it is NULL, we cannot put any useful data in it anyway, * so we don't touch it. */ #else /* That's what used to be done when cert_st and sess_cert_st were * the same. */ if (!hit) { /* else add cert to session */ CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT); if (s->session->sess_cert != NULL) ssl_cert_free(s->session->sess_cert); s->session->sess_cert=s->cert; } else /* We have a session id-cache hit, if the * session-id has no certificate listed against * the 'cert' structure, grab the 'old' one * listed against the SSL connection */ { if (s->session->sess_cert == NULL) { CRYPTO_add(&s->cert->references,1, CRYPTO_LOCK_SSL_CERT); s->session->sess_cert=s->cert; } } #endif if (s->cert == NULL) { ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE); SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED); return(-1); } if (hit) { *(p++)=0; /* no certificate type */ s2n(s->version,p); /* version */ s2n(0,p); /* cert len */ s2n(0,p); /* ciphers len */ } else { /* EAY EAY */ /* put certificate type */ *(p++)=SSL2_CT_X509_CERTIFICATE; s2n(s->version,p); /* version */ n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL); s2n(n,p); /* certificate length */ i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d); n=0; /* lets send out the ciphers we like in the * prefered order */ sk= s->session->ciphers; n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0); d+=n; s2n(n,p); /* add cipher length */ } /* make and send conn_id */ s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */ s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH; if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0) return -1; memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH); d+=SSL2_CONNECTION_ID_LENGTH; s->state=SSL2_ST_SEND_SERVER_HELLO_B; s->init_num=d-(unsigned char *)s->init_buf->data; s->init_off=0; } /* SSL2_ST_SEND_SERVER_HELLO_B */ /* If we are using TCP/IP, the performance is bad if we do 2 * writes without a read between them. This occurs when * Session-id reuse is used, so I will put in a buffering module */ if (s->hit) { if (!ssl_init_wbio_buffer(s,1)) return(-1); } return(ssl2_do_write(s)); } static int get_client_finished(SSL *s) { unsigned char *p; int i, n; unsigned long len; p=(unsigned char *)s->init_buf->data; if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) { i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num); if (i < 1-s->init_num) return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i)); s->init_num += i; if (*p != SSL2_MT_CLIENT_FINISHED) { if (*p != SSL2_MT_ERROR) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE); } else { SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR); /* try to read the error message */ i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num); return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i); } return(-1); } s->state=SSL2_ST_GET_CLIENT_FINISHED_B; } /* SSL2_ST_GET_CLIENT_FINISHED_B */ if (s->s2->conn_id_length > sizeof s->s2->conn_id) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); return -1; } len = 1 + (unsigned long)s->s2->conn_id_length; n = (int)len - s->init_num; i = ssl2_read(s,(char *)&(p[s->init_num]),n); if (i < n) { return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i)); } if (s->msg_callback) s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */ p += 1; if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT); return(-1); } return(1); } static int server_verify(SSL *s) { unsigned char *p; if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) { p=(unsigned char *)s->init_buf->data; *(p++)=SSL2_MT_SERVER_VERIFY; if (s->s2->challenge_length > sizeof s->s2->challenge) { SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR); return -1; } memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length); /* p+=s->s2->challenge_length; */ s->state=SSL2_ST_SEND_SERVER_VERIFY_B; s->init_num=s->s2->challenge_length+1; s->init_off=0; } return(ssl2_do_write(s)); } static int server_finish(SSL *s) { unsigned char *p; if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) { p=(unsigned char *)s->init_buf->data; *(p++)=SSL2_MT_SERVER_FINISHED; if (s->session->session_id_length > sizeof s->session->session_id) { SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR); return -1; } memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length); /* p+=s->session->session_id_length; */ s->state=SSL2_ST_SEND_SERVER_FINISHED_B; s->init_num=s->session->session_id_length+1; s->init_off=0; } /* SSL2_ST_SEND_SERVER_FINISHED_B */ return(ssl2_do_write(s)); } /* send the request and check the response */ static int request_certificate(SSL *s) { const unsigned char *cp; unsigned char *p,*p2,*buf2; unsigned char *ccd; int i,j,ctype,ret= -1; unsigned long len; X509 *x509=NULL; STACK_OF(X509) *sk=NULL; ccd=s->s2->tmp.ccl; if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) { p=(unsigned char *)s->init_buf->data; *(p++)=SSL2_MT_REQUEST_CERTIFICATE; *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION; if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0) return -1; memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B; s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2; s->init_off=0; } if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) { i=ssl2_do_write(s); if (i <= 0) { ret=i; goto end; } s->init_num=0; s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C; } if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) { p=(unsigned char *)s->init_buf->data; i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */ if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3 * (probably NO-CERTIFICATE-ERROR) */ { ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i); goto end; } s->init_num += i; if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) { n2s(p,i); if (i != SSL2_PE_NO_CERTIFICATE) { /* not the error message we expected -- let ssl2_part_read handle it */ s->init_num -= 3; ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3); goto end; } if (s->msg_callback) s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */ /* this is the one place where we can recover from an SSL 2.0 error */ if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); goto end; } ret=1; goto end; } if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ); goto end; } if (s->init_num != 6) { SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR); goto end; } /* ok we have a response */ /* certificate type, there is only one right now. */ ctype= *(p++); if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) { ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT); goto end; } n2s(p,i); s->s2->tmp.clen=i; n2s(p,i); s->s2->tmp.rlen=i; s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D; } /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */ p=(unsigned char *)s->init_buf->data; len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen; if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG); goto end; } j = (int)len - s->init_num; i = ssl2_read(s,(char *)&(p[s->init_num]),j); if (i < j) { ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i); goto end; } if (s->msg_callback) s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */ p += 6; cp = p; x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen); if (x509 == NULL) { SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB); goto msg_end; } if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509))) { SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE); goto msg_end; } i=ssl_verify_cert_chain(s,sk); if (i > 0) /* we like the packet, now check the chksum */ { EVP_MD_CTX ctx; EVP_PKEY *pkey=NULL; EVP_MD_CTX_init(&ctx); EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL); EVP_VerifyUpdate(&ctx,s->s2->key_material, s->s2->key_material_length); EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL); buf2=OPENSSL_malloc((unsigned int)i); if (buf2 == NULL) { SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE); goto msg_end; } p2=buf2; i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2); EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i); OPENSSL_free(buf2); pkey=X509_get_pubkey(x509); if (pkey == NULL) goto end; i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey); EVP_PKEY_free(pkey); EVP_MD_CTX_cleanup(&ctx); if (i > 0) { if (s->session->peer != NULL) X509_free(s->session->peer); s->session->peer=x509; CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509); s->session->verify_result = s->verify_result; ret=1; goto end; } else { SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM); goto msg_end; } } else { msg_end: ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE); } end: sk_X509_free(sk); X509_free(x509); return(ret); } static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, unsigned char *to, int padding) { RSA *rsa; int i; if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) { SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY); return(-1); } if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) { SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA); return(-1); } rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa; /* we have the public key */ i=RSA_private_decrypt(len,from,to,rsa,padding); if (i < 0) SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB); return(i); } #else /* !OPENSSL_NO_SSL2 */ # if PEDANTIC static void *dummy=&dummy; # endif #endif