/* ssl/s2_pkt.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 <errno.h> #define USE_SOCKETS static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); static int ssl_mt_error(int n); /* SSL 2.0 imlementation for SSL_read/SSL_peek - * This routine will return 0 to len bytes, decrypted etc if required. */ static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) { int n; unsigned char mac[MAX_MAC_SIZE]; unsigned char *p; int i; unsigned int mac_size; ssl2_read_again: if (SSL_in_init(s) && !s->in_handshake) { n=s->handshake_func(s); if (n < 0) return(n); if (n == 0) { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE); return(-1); } } clear_sys_error(); s->rwstate=SSL_NOTHING; if (len <= 0) return(len); if (s->s2->ract_data_length != 0) /* read from buffer */ { if (len > s->s2->ract_data_length) n=s->s2->ract_data_length; else n=len; memcpy(buf,s->s2->ract_data,(unsigned int)n); if (!peek) { s->s2->ract_data_length-=n; s->s2->ract_data+=n; if (s->s2->ract_data_length == 0) s->rstate=SSL_ST_READ_HEADER; } return(n); } /* s->s2->ract_data_length == 0 * * Fill the buffer, then goto ssl2_read_again. */ if (s->rstate == SSL_ST_READ_HEADER) { if (s->first_packet) { n=read_n(s,5,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); if (n <= 0) return(n); /* error or non-blocking */ s->first_packet=0; p=s->packet; if (!((p[0] & 0x80) && ( (p[2] == SSL2_MT_CLIENT_HELLO) || (p[2] == SSL2_MT_SERVER_HELLO)))) { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET); return(-1); } } else { n=read_n(s,2,SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2,0); if (n <= 0) return(n); /* error or non-blocking */ } /* part read stuff */ s->rstate=SSL_ST_READ_BODY; p=s->packet; /* Do header */ /*s->s2->padding=0;*/ s->s2->escape=0; s->s2->rlength=(((unsigned int)p[0])<<8)|((unsigned int)p[1]); if ((p[0] & TWO_BYTE_BIT)) /* Two byte header? */ { s->s2->three_byte_header=0; s->s2->rlength&=TWO_BYTE_MASK; } else { s->s2->three_byte_header=1; s->s2->rlength&=THREE_BYTE_MASK; /* security >s2->escape */ s->s2->escape=((p[0] & SEC_ESC_BIT))?1:0; } } if (s->rstate == SSL_ST_READ_BODY) { n=s->s2->rlength+2+s->s2->three_byte_header; if (n > (int)s->packet_length) { n-=s->packet_length; i=read_n(s,(unsigned int)n,(unsigned int)n,1); if (i <= 0) return(i); /* ERROR */ } p= &(s->packet[2]); s->rstate=SSL_ST_READ_HEADER; if (s->s2->three_byte_header) s->s2->padding= *(p++); else s->s2->padding=0; /* Data portion */ if (s->s2->clear_text) { mac_size = 0; s->s2->mac_data=p; s->s2->ract_data=p; if (s->s2->padding) { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); return(-1); } } else { mac_size=EVP_MD_size(s->read_hash); OPENSSL_assert(mac_size <= MAX_MAC_SIZE); s->s2->mac_data=p; s->s2->ract_data= &p[mac_size]; if (s->s2->padding + mac_size > s->s2->rlength) { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_ILLEGAL_PADDING); return(-1); } } s->s2->ract_data_length=s->s2->rlength; /* added a check for length > max_size in case * encryption was not turned on yet due to an error */ if ((!s->s2->clear_text) && (s->s2->rlength >= mac_size)) { ssl2_enc(s,0); s->s2->ract_data_length-=mac_size; ssl2_mac(s,mac,0); s->s2->ract_data_length-=s->s2->padding; if ( (memcmp(mac,s->s2->mac_data, (unsigned int)mac_size) != 0) || (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); return(-1); } } INC32(s->s2->read_sequence); /* expect next number */ /* s->s2->ract_data is now available for processing */ /* Possibly the packet that we just read had 0 actual data bytes. * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) * In this case, returning 0 would be interpreted by the caller * as indicating EOF, so it's not a good idea. Instead, we just * continue reading; thus ssl2_read_internal may have to process * multiple packets before it can return. * * [Note that using select() for blocking sockets *never* guarantees * that the next SSL_read will not block -- the available * data may contain incomplete packets, and except for SSL 2, * renegotiation can confuse things even more.] */ goto ssl2_read_again; /* This should really be * "return ssl2_read(s,buf,len)", * but that would allow for * denial-of-service attacks if a * C compiler is used that does not * recognize end-recursion. */ } else { SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); return(-1); } } int ssl2_read(SSL *s, void *buf, int len) { return ssl2_read_internal(s, buf, len, 0); } int ssl2_peek(SSL *s, void *buf, int len) { return ssl2_read_internal(s, buf, len, 1); } static int read_n(SSL *s, unsigned int n, unsigned int max, unsigned int extend) { int i,off,newb; /* if there is stuff still in the buffer from a previous read, * and there is more than we want, take some. */ if (s->s2->rbuf_left >= (int)n) { if (extend) s->packet_length+=n; else { s->packet= &(s->s2->rbuf[s->s2->rbuf_offs]); s->packet_length=n; } s->s2->rbuf_left-=n; s->s2->rbuf_offs+=n; return(n); } if (!s->read_ahead) max=n; if (max > (unsigned int)(SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) max=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2; /* Else we want more than we have. * First, if there is some left or we want to extend */ off=0; if ((s->s2->rbuf_left != 0) || ((s->packet_length != 0) && extend)) { newb=s->s2->rbuf_left; if (extend) { off=s->packet_length; if (s->packet != s->s2->rbuf) memcpy(s->s2->rbuf,s->packet, (unsigned int)newb+off); } else if (s->s2->rbuf_offs != 0) { memcpy(s->s2->rbuf,&(s->s2->rbuf[s->s2->rbuf_offs]), (unsigned int)newb); s->s2->rbuf_offs=0; } s->s2->rbuf_left=0; } else newb=0; /* off is the offset to start writing too. * r->s2->rbuf_offs is the 'unread data', now 0. * newb is the number of new bytes so far */ s->packet=s->s2->rbuf; while (newb < (int)n) { clear_sys_error(); if (s->rbio != NULL) { s->rwstate=SSL_READING; i=BIO_read(s->rbio,(char *)&(s->s2->rbuf[off+newb]), max-newb); } else { SSLerr(SSL_F_READ_N,SSL_R_READ_BIO_NOT_SET); i= -1; } #ifdef PKT_DEBUG if (s->debug & 0x01) sleep(1); #endif if (i <= 0) { s->s2->rbuf_left+=newb; return(i); } newb+=i; } /* record unread data */ if (newb > (int)n) { s->s2->rbuf_offs=n+off; s->s2->rbuf_left=newb-n; } else { s->s2->rbuf_offs=0; s->s2->rbuf_left=0; } if (extend) s->packet_length+=n; else s->packet_length=n; s->rwstate=SSL_NOTHING; return(n); } int ssl2_write(SSL *s, const void *_buf, int len) { const unsigned char *buf=_buf; unsigned int n,tot; int i; if (SSL_in_init(s) && !s->in_handshake) { i=s->handshake_func(s); if (i < 0) return(i); if (i == 0) { SSLerr(SSL_F_SSL2_WRITE,SSL_R_SSL_HANDSHAKE_FAILURE); return(-1); } } if (s->error) { ssl2_write_error(s); if (s->error) return(-1); } clear_sys_error(); s->rwstate=SSL_NOTHING; if (len <= 0) return(len); tot=s->s2->wnum; s->s2->wnum=0; n=(len-tot); for (;;) { i=do_ssl_write(s,&(buf[tot]),n); if (i <= 0) { s->s2->wnum=tot; return(i); } if ((i == (int)n) || (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)) { return(tot+i); } n-=i; tot+=i; } } static int write_pending(SSL *s, const unsigned char *buf, unsigned int len) { int i; /* s->s2->wpend_len != 0 MUST be true. */ /* check that they have given us the same buffer to * write */ if ((s->s2->wpend_tot > (int)len) || ((s->s2->wpend_buf != buf) && !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))) { SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); return(-1); } for (;;) { clear_sys_error(); if (s->wbio != NULL) { s->rwstate=SSL_WRITING; i=BIO_write(s->wbio, (char *)&(s->s2->write_ptr[s->s2->wpend_off]), (unsigned int)s->s2->wpend_len); } else { SSLerr(SSL_F_WRITE_PENDING,SSL_R_WRITE_BIO_NOT_SET); i= -1; } #ifdef PKT_DEBUG if (s->debug & 0x01) sleep(1); #endif if (i == s->s2->wpend_len) { s->s2->wpend_len=0; s->rwstate=SSL_NOTHING; return(s->s2->wpend_ret); } else if (i <= 0) return(i); s->s2->wpend_off+=i; s->s2->wpend_len-=i; } } static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) { unsigned int j,k,olen,p,mac_size,bs; register unsigned char *pp; olen=len; /* first check if there is data from an encryption waiting to * be sent - it must be sent because the other end is waiting. * This will happen with non-blocking IO. We print it and then * return. */ if (s->s2->wpend_len != 0) return(write_pending(s,buf,len)); /* set mac_size to mac size */ if (s->s2->clear_text) mac_size=0; else mac_size=EVP_MD_size(s->write_hash); /* lets set the pad p */ if (s->s2->clear_text) { if (len > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) len=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; p=0; s->s2->three_byte_header=0; /* len=len; */ } else { bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); j=len+mac_size; /* Two-byte headers allow for a larger record length than * three-byte headers, but we can't use them if we need * padding or if we have to set the escape bit. */ if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && (!s->s2->escape)) { if (j > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER) j=SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER; /* set k to the max number of bytes with 2 * byte header */ k=j-(j%bs); /* how many data bytes? */ len=k-mac_size; s->s2->three_byte_header=0; p=0; } else if ((bs <= 1) && (!s->s2->escape)) { /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ s->s2->three_byte_header=0; p=0; } else /* we may have to use a 3 byte header */ { /* If s->s2->escape is not set, then * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ p=(j%bs); p=(p == 0)?0:(bs-p); if (s->s2->escape) { s->s2->three_byte_header=1; if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; } else s->s2->three_byte_header=(p == 0)?0:1; } } /* Now * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER * holds, and if s->s2->three_byte_header is set, then even * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. */ /* mac_size is the number of MAC bytes * len is the number of data bytes we are going to send * p is the number of padding bytes * (if it is a two-byte header, then p == 0) */ s->s2->wlength=len; s->s2->padding=p; s->s2->mac_data= &(s->s2->wbuf[3]); s->s2->wact_data= &(s->s2->wbuf[3+mac_size]); /* we copy the data into s->s2->wbuf */ memcpy(s->s2->wact_data,buf,len); if (p) memset(&(s->s2->wact_data[len]),0,p); /* arbitrary padding */ if (!s->s2->clear_text) { s->s2->wact_data_length=len+p; ssl2_mac(s,s->s2->mac_data,1); s->s2->wlength+=p+mac_size; ssl2_enc(s,1); } /* package up the header */ s->s2->wpend_len=s->s2->wlength; if (s->s2->three_byte_header) /* 3 byte header */ { pp=s->s2->mac_data; pp-=3; pp[0]=(s->s2->wlength>>8)&(THREE_BYTE_MASK>>8); if (s->s2->escape) pp[0]|=SEC_ESC_BIT; pp[1]=s->s2->wlength&0xff; pp[2]=s->s2->padding; s->s2->wpend_len+=3; } else { pp=s->s2->mac_data; pp-=2; pp[0]=((s->s2->wlength>>8)&(TWO_BYTE_MASK>>8))|TWO_BYTE_BIT; pp[1]=s->s2->wlength&0xff; s->s2->wpend_len+=2; } s->s2->write_ptr=pp; INC32(s->s2->write_sequence); /* expect next number */ /* lets try to actually write the data */ s->s2->wpend_tot=olen; s->s2->wpend_buf=buf; s->s2->wpend_ret=len; s->s2->wpend_off=0; return(write_pending(s,buf,olen)); } int ssl2_part_read(SSL *s, unsigned long f, int i) { unsigned char *p; int j; if (i < 0) { /* ssl2_return_error(s); */ /* for non-blocking io, * this is not necessarily fatal */ return(i); } else { s->init_num+=i; /* Check for error. While there are recoverable errors, * this function is not called when those must be expected; * any error detected here is fatal. */ if (s->init_num >= 3) { p=(unsigned char *)s->init_buf->data; if (p[0] == SSL2_MT_ERROR) { j=(p[1]<<8)|p[2]; SSLerr((int)f,ssl_mt_error(j)); s->init_num -= 3; if (s->init_num > 0) memmove(p, p+3, s->init_num); } } /* If it's not an error message, we have some error anyway -- * the message was shorter than expected. This too is treated * as fatal (at least if SSL_get_error is asked for its opinion). */ return(0); } } int ssl2_do_write(SSL *s) { int ret; ret=ssl2_write(s,&s->init_buf->data[s->init_off],s->init_num); if (ret == s->init_num) { if (s->msg_callback) s->msg_callback(1, s->version, 0, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); return(1); } if (ret < 0) return(-1); s->init_off+=ret; s->init_num-=ret; return(0); } static int ssl_mt_error(int n) { int ret; switch (n) { case SSL2_PE_NO_CIPHER: ret=SSL_R_PEER_ERROR_NO_CIPHER; break; case SSL2_PE_NO_CERTIFICATE: ret=SSL_R_PEER_ERROR_NO_CERTIFICATE; break; case SSL2_PE_BAD_CERTIFICATE: ret=SSL_R_PEER_ERROR_CERTIFICATE; break; case SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE: ret=SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE; break; default: ret=SSL_R_UNKNOWN_REMOTE_ERROR_TYPE; break; } return(ret); } #else /* !OPENSSL_NO_SSL2 */ # if PEDANTIC static void *dummy=&dummy; # endif #endif