diff options
Diffstat (limited to 'ssl/s2_pkt.c')
| -rw-r--r-- | ssl/s2_pkt.c | 651 |
1 files changed, 651 insertions, 0 deletions
diff --git a/ssl/s2_pkt.c b/ssl/s2_pkt.c new file mode 100644 index 0000000000..84bea33e2e --- /dev/null +++ b/ssl/s2_pkt.c @@ -0,0 +1,651 @@ +/* ssl/s2_pkt.c */ +/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include <stdio.h> +#include <errno.h> +#define USE_SOCKETS +#include "ssl_locl.h" + +/* SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CIPHER); + * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_NO_CERTIFICATE); + * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_CERTIFICATE); + * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_PEER_ERROR_UNSUPPORTED_CERTIFICATE_TYPE); + * SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_UNKNOWN_REMOTE_ERROR_TYPE); + */ + +#ifndef NOPROTO +static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); +static int do_ssl_write(SSL *s, const char *buf, unsigned int len); +static int write_pending(SSL *s, const char *buf, unsigned int len); +static int ssl_mt_error(int n); +#else +static int read_n(); +static int do_ssl_write(); +static int write_pending(); +static int ssl_mt_error(); +#endif + +int ssl2_peek(s,buf,len) +SSL *s; +char *buf; +int len; + { + int ret; + + ret=ssl2_read(s,buf,len); + if (ret > 0) + { + s->s2->ract_data_length+=ret; + s->s2->ract_data-=ret; + } + return(ret); + } + +/* SSL_read - + * This routine will return 0 to len bytes, decrypted etc if required. + */ +int ssl2_read(s, buf, len) +SSL *s; +char *buf; +int len; + { + int n; + unsigned char mac[MAX_MAC_SIZE]; + unsigned char *p; + int i; + unsigned int mac_size=0; + + 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,SSL_R_SSL_HANDSHAKE_FAILURE); + return(-1); + } + } + + errno=0; + 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); + 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); + } + + 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,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) + { + s->s2->mac_data=p; + s->s2->ract_data=p; + s->s2->pad_data=NULL; + } + else + { + mac_size=EVP_MD_size(s->read_hash); + s->s2->mac_data=p; + s->s2->ract_data= &p[mac_size]; + s->s2->pad_data= &p[mac_size+ + s->s2->rlength-s->s2->padding]; + } + + 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,SSL_R_BAD_MAC_DECODE); + return(SSL_RWERR_BAD_MAC_DECODE); + } + } + INC32(s->s2->read_sequence); /* expect next number */ + /* s->s2->ract_data is now available for processing */ + + /* If a 0 byte packet was sent, return 0, otherwise + * we play havoc with people using select with + * blocking sockets. Let them handle a packet at a time, + * they should really be using non-blocking sockets. */ + if (s->s2->ract_data_length == 0) + return(0); + return(ssl2_read(s,buf,len)); + } + else + { + SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE); + return(SSL_RWERR_INTERNAL_ERROR); + } + } + +static int read_n(s, n, max, extend) +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) + { + errno=0; + 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(s, buf, len) +SSL *s; +const char *buf; +int len; + { + 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); + } + + errno=0; + 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) return(tot+i); + + n-=i; + tot+=i; + } + } + +static int write_pending(s,buf,len) +SSL *s; +const 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)) + { + SSLerr(SSL_F_WRITE_PENDING,SSL_R_BAD_WRITE_RETRY); + return(SSL_RWERR_BAD_WRITE_RETRY); + } + + for (;;) + { + errno=0; + 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(s, buf, len) +SSL *s; +const 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; + 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)) + { + /* len=len; */ + s->s2->three_byte_header=0; + p=0; + } + else /* 3 byte header */ + { + /*len=len; */ + p=(j%bs); + p=(p == 0)?0:(bs-p); + if (s->s2->escape) + s->s2->three_byte_header=1; + else + s->s2->three_byte_header=(p == 0)?0:1; + } + } + /* 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 p == 0, it is a 2 byte header */ + + 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); +#ifdef PURIFY + if (p) + memset(&(s->s2->wact_data[len]),0,p); +#endif + + 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=(char *)buf; + + s->s2->wpend_ret=len; + + s->s2->wpend_off=0; + return(write_pending(s,buf,olen)); + } + +int ssl2_part_read(s,f,i) +SSL *s; +unsigned long f; +int i; + { + unsigned char *p; + int j; + + /* check for error */ + if ((s->init_num == 0) && (i >= 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)); + } + } + + if (i < 0) + { + /* ssl2_return_error(s); */ + /* for non-blocking io, + * this is not fatal */ + return(i); + } + else + { + s->init_num+=i; + return(0); + } + } + +int ssl2_do_write(s) +SSL *s; + { + int ret; + + ret=ssl2_write(s,(char *)&(s->init_buf->data[s->init_off]), + s->init_num); + if (ret == s->init_num) + return(1); + if (ret < 0) + return(-1); + s->init_off+=ret; + s->init_num-=ret; + return(0); + } + +static int ssl_mt_error(n) +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); + } |