+++ /dev/null
-/* ssl/s3_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) 1998-2002 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
-
-#include <stdio.h>
-#include <limits.h>
-#include <errno.h>
-#define USE_SOCKETS
-#include "ssl_locl.h"
-#include <openssl/evp.h>
-#include <openssl/buffer.h>
-#include <openssl/rand.h>
-
-static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
- unsigned int len, int create_empty_fragment);
-static int ssl3_get_record(SSL *s);
-
-int ssl3_read_n(SSL *s, int n, int max, int extend)
- {
- /* If extend == 0, obtain new n-byte packet; if extend == 1, increase
- * packet by another n bytes.
- * The packet will be in the sub-array of s->s3->rbuf.buf specified
- * by s->packet and s->packet_length.
- * (If s->read_ahead is set, 'max' bytes may be stored in rbuf
- * [plus s->packet_length bytes if extend == 1].)
- */
- int i,len,left;
- long align=0;
- unsigned char *pkt;
- SSL3_BUFFER *rb;
-
- if (n <= 0) return n;
-
- rb = &(s->s3->rbuf);
- if (rb->buf == NULL)
- if (!ssl3_setup_read_buffer(s))
- return -1;
-
- left = rb->left;
-#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
- align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
- align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
-#endif
-
- if (!extend)
- {
- /* start with empty packet ... */
- if (left == 0)
- rb->offset = align;
- else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH)
- {
- /* check if next packet length is large
- * enough to justify payload alignment... */
- pkt = rb->buf + rb->offset;
- if (pkt[0] == SSL3_RT_APPLICATION_DATA
- && (pkt[3]<<8|pkt[4]) >= 128)
- {
- /* Note that even if packet is corrupted
- * and its length field is insane, we can
- * only be led to wrong decision about
- * whether memmove will occur or not.
- * Header values has no effect on memmove
- * arguments and therefore no buffer
- * overrun can be triggered. */
- memmove (rb->buf+align,pkt,left);
- rb->offset = align;
- }
- }
- s->packet = rb->buf + rb->offset;
- s->packet_length = 0;
- /* ... now we can act as if 'extend' was set */
- }
-
- /* For DTLS/UDP reads should not span multiple packets
- * because the read operation returns the whole packet
- * at once (as long as it fits into the buffer). */
- if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
- {
- if (left > 0 && n > left)
- n = left;
- }
-
- /* if there is enough in the buffer from a previous read, take some */
- if (left >= n)
- {
- s->packet_length+=n;
- rb->left=left-n;
- rb->offset+=n;
- return(n);
- }
-
- /* else we need to read more data */
-
- len = s->packet_length;
- pkt = rb->buf+align;
- /* Move any available bytes to front of buffer:
- * 'len' bytes already pointed to by 'packet',
- * 'left' extra ones at the end */
- if (s->packet != pkt) /* len > 0 */
- {
- memmove(pkt, s->packet, len+left);
- s->packet = pkt;
- rb->offset = len + align;
- }
-
- if (n > (int)(rb->len - rb->offset)) /* does not happen */
- {
- SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- if (!s->read_ahead)
- /* ignore max parameter */
- max = n;
- else
- {
- if (max < n)
- max = n;
- if (max > (int)(rb->len - rb->offset))
- max = rb->len - rb->offset;
- }
-
- while (left < n)
- {
- /* Now we have len+left bytes at the front of s->s3->rbuf.buf
- * and need to read in more until we have len+n (up to
- * len+max if possible) */
-
- clear_sys_error();
- if (s->rbio != NULL)
- {
- s->rwstate=SSL_READING;
- i=BIO_read(s->rbio,pkt+len+left, max-left);
- }
- else
- {
- SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET);
- i = -1;
- }
-
- if (i <= 0)
- {
- rb->left = left;
- if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
- SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
- if (len+left == 0)
- ssl3_release_read_buffer(s);
- return(i);
- }
- left+=i;
- /* reads should *never* span multiple packets for DTLS because
- * the underlying transport protocol is message oriented as opposed
- * to byte oriented as in the TLS case. */
- if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
- {
- if (n > left)
- n = left; /* makes the while condition false */
- }
- }
-
- /* done reading, now the book-keeping */
- rb->offset += n;
- rb->left = left - n;
- s->packet_length += n;
- s->rwstate=SSL_NOTHING;
- return(n);
- }
-
-/* MAX_EMPTY_RECORDS defines the number of consecutive, empty records that will
- * be processed per call to ssl3_get_record. Without this limit an attacker
- * could send empty records at a faster rate than we can process and cause
- * ssl3_get_record to loop forever. */
-#define MAX_EMPTY_RECORDS 32
-
-/* Call this to get a new input record.
- * It will return <= 0 if more data is needed, normally due to an error
- * or non-blocking IO.
- * When it finishes, one packet has been decoded and can be found in
- * ssl->s3->rrec.type - is the type of record
- * ssl->s3->rrec.data, - data
- * ssl->s3->rrec.length, - number of bytes
- */
-/* used only by ssl3_read_bytes */
-static int ssl3_get_record(SSL *s)
- {
- int ssl_major,ssl_minor,al;
- int enc_err,n,i,ret= -1;
- SSL3_RECORD *rr;
- SSL_SESSION *sess;
- unsigned char *p;
- unsigned char md[EVP_MAX_MD_SIZE];
- short version;
- unsigned mac_size, orig_len;
- size_t extra;
- unsigned empty_record_count = 0;
-
- rr= &(s->s3->rrec);
- sess=s->session;
-
- if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
- extra=SSL3_RT_MAX_EXTRA;
- else
- extra=0;
- if (extra && !s->s3->init_extra)
- {
- /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
- * set after ssl3_setup_buffers() was done */
- SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
-again:
- /* check if we have the header */
- if ( (s->rstate != SSL_ST_READ_BODY) ||
- (s->packet_length < SSL3_RT_HEADER_LENGTH))
- {
- n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
- if (n <= 0) return(n); /* error or non-blocking */
- s->rstate=SSL_ST_READ_BODY;
-
- p=s->packet;
-
- /* Pull apart the header into the SSL3_RECORD */
- rr->type= *(p++);
- ssl_major= *(p++);
- ssl_minor= *(p++);
- version=(ssl_major<<8)|ssl_minor;
- n2s(p,rr->length);
-#if 0
-fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
-#endif
-
- /* Lets check version */
- if (!s->first_packet)
- {
- if (version != s->version)
- {
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
- /* Send back error using their minor version number :-) */
- s->version = (unsigned short)version;
- al=SSL_AD_PROTOCOL_VERSION;
- goto f_err;
- }
- }
-
- if ((version>>8) != SSL3_VERSION_MAJOR)
- {
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- goto err;
- }
-
- if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
- goto f_err;
- }
-
- /* now s->rstate == SSL_ST_READ_BODY */
- }
-
- /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
-
- if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
- {
- /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
- i=rr->length;
- n=ssl3_read_n(s,i,i,1);
- if (n <= 0) return(n); /* error or non-blocking io */
- /* now n == rr->length,
- * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
- }
-
- s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
-
- /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
- * and we have that many bytes in s->packet
- */
- rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
-
- /* ok, we can now read from 's->packet' data into 'rr'
- * rr->input points at rr->length bytes, which
- * need to be copied into rr->data by either
- * the decryption or by the decompression
- * When the data is 'copied' into the rr->data buffer,
- * rr->input will be pointed at the new buffer */
-
- /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
- * rr->length bytes of encrypted compressed stuff. */
-
- /* check is not needed I believe */
- if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
- goto f_err;
- }
-
- /* decrypt in place in 'rr->input' */
- rr->data=rr->input;
-
- enc_err = s->method->ssl3_enc->enc(s,0);
- /* enc_err is:
- * 0: (in non-constant time) if the record is publically invalid.
- * 1: if the padding is valid
- * -1: if the padding is invalid */
- if (enc_err == 0)
- {
- al=SSL_AD_DECRYPTION_FAILED;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
- goto f_err;
- }
-
-#ifdef TLS_DEBUG
-printf("dec %d\n",rr->length);
-{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); }
-printf("\n");
-#endif
-
- /* r->length is now the compressed data plus mac */
- if ((sess != NULL) &&
- (s->enc_read_ctx != NULL) &&
- (EVP_MD_CTX_md(s->read_hash) != NULL))
- {
- /* s->read_hash != NULL => mac_size != -1 */
- unsigned char *mac = NULL;
- unsigned char mac_tmp[EVP_MAX_MD_SIZE];
- mac_size=EVP_MD_CTX_size(s->read_hash);
- OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
-
- /* kludge: *_cbc_remove_padding passes padding length in rr->type */
- orig_len = rr->length+((unsigned int)rr->type>>8);
-
- /* orig_len is the length of the record before any padding was
- * removed. This is public information, as is the MAC in use,
- * therefore we can safely process the record in a different
- * amount of time if it's too short to possibly contain a MAC.
- */
- if (orig_len < mac_size ||
- /* CBC records must have a padding length byte too. */
- (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
- orig_len < mac_size+1))
- {
- al=SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
- goto f_err;
- }
-
- if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE)
- {
- /* We update the length so that the TLS header bytes
- * can be constructed correctly but we need to extract
- * the MAC in constant time from within the record,
- * without leaking the contents of the padding bytes.
- * */
- mac = mac_tmp;
- ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len);
- rr->length -= mac_size;
- }
- else
- {
- /* In this case there's no padding, so |orig_len|
- * equals |rec->length| and we checked that there's
- * enough bytes for |mac_size| above. */
- rr->length -= mac_size;
- mac = &rr->data[rr->length];
- }
-
- i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
- if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
- enc_err = -1;
- if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
- enc_err = -1;
- }
-
- if (enc_err < 0)
- {
- /* A separate 'decryption_failed' alert was introduced with TLS 1.0,
- * SSL 3.0 only has 'bad_record_mac'. But unless a decryption
- * failure is directly visible from the ciphertext anyway,
- * we should not reveal which kind of error occured -- this
- * might become visible to an attacker (e.g. via a logfile) */
- al=SSL_AD_BAD_RECORD_MAC;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
- goto f_err;
- }
-
- /* r->length is now just compressed */
- if (s->expand != NULL)
- {
- if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_COMPRESSED_LENGTH_TOO_LONG);
- goto f_err;
- }
- if (!ssl3_do_uncompress(s))
- {
- al=SSL_AD_DECOMPRESSION_FAILURE;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
- goto f_err;
- }
- }
-
- if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH+extra)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DATA_LENGTH_TOO_LONG);
- goto f_err;
- }
-
- rr->off=0;
- /* So at this point the following is true
- * ssl->s3->rrec.type is the type of record
- * ssl->s3->rrec.length == number of bytes in record
- * ssl->s3->rrec.off == offset to first valid byte
- * ssl->s3->rrec.data == where to take bytes from, increment
- * after use :-).
- */
-
- /* we have pulled in a full packet so zero things */
- s->packet_length=0;
-
- /* just read a 0 length packet */
- if (rr->length == 0)
- {
- empty_record_count++;
- if (empty_record_count > MAX_EMPTY_RECORDS)
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_RECORD_TOO_SMALL);
- goto f_err;
- }
- goto again;
- }
-
-#if 0
-fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, rr->length);
-#endif
-
- return(1);
-
-f_err:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
-err:
- return(ret);
- }
-
-int ssl3_do_uncompress(SSL *ssl)
- {
-#ifndef OPENSSL_NO_COMP
- int i;
- SSL3_RECORD *rr;
-
- rr= &(ssl->s3->rrec);
- i=COMP_expand_block(ssl->expand,rr->comp,
- SSL3_RT_MAX_PLAIN_LENGTH,rr->data,(int)rr->length);
- if (i < 0)
- return(0);
- else
- rr->length=i;
- rr->data=rr->comp;
-#endif
- return(1);
- }
-
-int ssl3_do_compress(SSL *ssl)
- {
-#ifndef OPENSSL_NO_COMP
- int i;
- SSL3_RECORD *wr;
-
- wr= &(ssl->s3->wrec);
- i=COMP_compress_block(ssl->compress,wr->data,
- SSL3_RT_MAX_COMPRESSED_LENGTH,
- wr->input,(int)wr->length);
- if (i < 0)
- return(0);
- else
- wr->length=i;
-
- wr->input=wr->data;
-#endif
- return(1);
- }
-
-/* Call this to write data in records of type 'type'
- * It will return <= 0 if not all data has been sent or non-blocking IO.
- */
-int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
- {
- const unsigned char *buf=buf_;
- unsigned int n,nw;
- int i,tot;
-
- s->rwstate=SSL_NOTHING;
- OPENSSL_assert(s->s3->wnum <= INT_MAX);
- tot=s->s3->wnum;
- s->s3->wnum=0;
-
- if (SSL_in_init(s) && !s->in_handshake)
- {
- i=s->handshake_func(s);
- if (i < 0) return(i);
- if (i == 0)
- {
- SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
- return -1;
- }
- }
-
- /* ensure that if we end up with a smaller value of data to write
- * out than the the original len from a write which didn't complete
- * for non-blocking I/O and also somehow ended up avoiding
- * the check for this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as
- * it must never be possible to end up with (len-tot) as a large
- * number that will then promptly send beyond the end of the users
- * buffer ... so we trap and report the error in a way the user
- * will notice
- */
- if (len < tot)
- {
- SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_BAD_LENGTH);
- return(-1);
- }
-
-
- n=(len-tot);
- for (;;)
- {
- if (n > s->max_send_fragment)
- nw=s->max_send_fragment;
- else
- nw=n;
-
- i=do_ssl3_write(s, type, &(buf[tot]), nw, 0);
- if (i <= 0)
- {
- s->s3->wnum=tot;
- return i;
- }
-
- if ((i == (int)n) ||
- (type == SSL3_RT_APPLICATION_DATA &&
- (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE)))
- {
- /* next chunk of data should get another prepended empty fragment
- * in ciphersuites with known-IV weakness: */
- s->s3->empty_fragment_done = 0;
-
- return tot+i;
- }
-
- n-=i;
- tot+=i;
- }
- }
-
-static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
- unsigned int len, int create_empty_fragment)
- {
- unsigned char *p,*plen;
- int i,mac_size,clear=0;
- int prefix_len=0;
- int eivlen;
- long align=0;
- SSL3_RECORD *wr;
- SSL3_BUFFER *wb=&(s->s3->wbuf);
- SSL_SESSION *sess;
-
-
- /* first check if there is a SSL3_BUFFER still being written
- * out. This will happen with non blocking IO */
- if (wb->left != 0)
- return(ssl3_write_pending(s,type,buf,len));
-
- /* If we have an alert to send, lets send it */
- if (s->s3->alert_dispatch)
- {
- i=s->method->ssl_dispatch_alert(s);
- if (i <= 0)
- return(i);
- /* if it went, fall through and send more stuff */
- }
-
- if (wb->buf == NULL)
- if (!ssl3_setup_write_buffer(s))
- return -1;
-
- if (len == 0 && !create_empty_fragment)
- return 0;
-
- wr= &(s->s3->wrec);
- sess=s->session;
-
- if ( (sess == NULL) ||
- (s->enc_write_ctx == NULL) ||
- (EVP_MD_CTX_md(s->write_hash) == NULL))
- {
-#if 1
- clear=s->enc_write_ctx?0:1; /* must be AEAD cipher */
-#else
- clear=1;
-#endif
- mac_size=0;
- }
- else
- {
- mac_size=EVP_MD_CTX_size(s->write_hash);
- if (mac_size < 0)
- goto err;
- }
-
- /* 'create_empty_fragment' is true only when this function calls itself */
- if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
- {
- /* countermeasure against known-IV weakness in CBC ciphersuites
- * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
-
- if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA)
- {
- /* recursive function call with 'create_empty_fragment' set;
- * this prepares and buffers the data for an empty fragment
- * (these 'prefix_len' bytes are sent out later
- * together with the actual payload) */
- prefix_len = do_ssl3_write(s, type, buf, 0, 1);
- if (prefix_len <= 0)
- goto err;
-
- if (prefix_len >
- (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
- {
- /* insufficient space */
- SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
- goto err;
- }
- }
-
- s->s3->empty_fragment_done = 1;
- }
-
- if (create_empty_fragment)
- {
-#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
- /* extra fragment would be couple of cipher blocks,
- * which would be multiple of SSL3_ALIGN_PAYLOAD, so
- * if we want to align the real payload, then we can
- * just pretent we simply have two headers. */
- align = (long)wb->buf + 2*SSL3_RT_HEADER_LENGTH;
- align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
-#endif
- p = wb->buf + align;
- wb->offset = align;
- }
- else if (prefix_len)
- {
- p = wb->buf + wb->offset + prefix_len;
- }
- else
- {
-#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
- align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
- align = (-align)&(SSL3_ALIGN_PAYLOAD-1);
-#endif
- p = wb->buf + align;
- wb->offset = align;
- }
-
- /* write the header */
-
- *(p++)=type&0xff;
- wr->type=type;
-
- *(p++)=(s->version>>8);
- /* Some servers hang if iniatial client hello is larger than 256
- * bytes and record version number > TLS 1.0
- */
- if (s->state == SSL3_ST_CW_CLNT_HELLO_B
- && !s->renegotiate
- && TLS1_get_version(s) > TLS1_VERSION)
- *(p++) = 0x1;
- else
- *(p++)=s->version&0xff;
-
- /* field where we are to write out packet length */
- plen=p;
- p+=2;
- /* Explicit IV length, block ciphers and TLS version 1.1 or later */
- if (s->enc_write_ctx && s->version >= TLS1_1_VERSION)
- {
- int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
- if (mode == EVP_CIPH_CBC_MODE)
- {
- eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
- if (eivlen <= 1)
- eivlen = 0;
- }
- /* Need explicit part of IV for GCM mode */
- else if (mode == EVP_CIPH_GCM_MODE)
- eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
- else
- eivlen = 0;
- }
- else
- eivlen = 0;
-
- /* lets setup the record stuff. */
- wr->data=p + eivlen;
- wr->length=(int)len;
- wr->input=(unsigned char *)buf;
-
- /* we now 'read' from wr->input, wr->length bytes into
- * wr->data */
-
- /* first we compress */
- if (s->compress != NULL)
- {
- if (!ssl3_do_compress(s))
- {
- SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
- goto err;
- }
- }
- else
- {
- memcpy(wr->data,wr->input,wr->length);
- wr->input=wr->data;
- }
-
- /* we should still have the output to wr->data and the input
- * from wr->input. Length should be wr->length.
- * wr->data still points in the wb->buf */
-
- if (mac_size != 0)
- {
- if (s->method->ssl3_enc->mac(s,&(p[wr->length + eivlen]),1) < 0)
- goto err;
- wr->length+=mac_size;
- }
-
- wr->input=p;
- wr->data=p;
-
- if (eivlen)
- {
- /* if (RAND_pseudo_bytes(p, eivlen) <= 0)
- goto err; */
- wr->length += eivlen;
- }
-
- /* ssl3_enc can only have an error on read */
- s->method->ssl3_enc->enc(s,1);
-
- /* record length after mac and block padding */
- s2n(wr->length,plen);
-
- /* we should now have
- * wr->data pointing to the encrypted data, which is
- * wr->length long */
- wr->type=type; /* not needed but helps for debugging */
- wr->length+=SSL3_RT_HEADER_LENGTH;
-
- if (create_empty_fragment)
- {
- /* we are in a recursive call;
- * just return the length, don't write out anything here
- */
- return wr->length;
- }
-
- /* now let's set up wb */
- wb->left = prefix_len + wr->length;
-
- /* memorize arguments so that ssl3_write_pending can detect bad write retries later */
- s->s3->wpend_tot=len;
- s->s3->wpend_buf=buf;
- s->s3->wpend_type=type;
- s->s3->wpend_ret=len;
-
- /* we now just need to write the buffer */
- return ssl3_write_pending(s,type,buf,len);
-err:
- return -1;
- }
-
-/* if s->s3->wbuf.left != 0, we need to call this */
-int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
- unsigned int len)
- {
- int i;
- SSL3_BUFFER *wb=&(s->s3->wbuf);
-
-/* XXXX */
- if ((s->s3->wpend_tot > (int)len)
- || ((s->s3->wpend_buf != buf) &&
- !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
- || (s->s3->wpend_type != type))
- {
- SSLerr(SSL_F_SSL3_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 *)&(wb->buf[wb->offset]),
- (unsigned int)wb->left);
- }
- else
- {
- SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET);
- i= -1;
- }
- if (i == wb->left)
- {
- wb->left=0;
- wb->offset+=i;
- if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
- SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER)
- ssl3_release_write_buffer(s);
- s->rwstate=SSL_NOTHING;
- return(s->s3->wpend_ret);
- }
- else if (i <= 0) {
- if (s->version == DTLS1_VERSION ||
- s->version == DTLS1_BAD_VER) {
- /* For DTLS, just drop it. That's kind of the whole
- point in using a datagram service */
- wb->left = 0;
- }
- return(i);
- }
- wb->offset+=i;
- wb->left-=i;
- }
- }
-
-/* Return up to 'len' payload bytes received in 'type' records.
- * 'type' is one of the following:
- *
- * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us)
- * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us)
- * - 0 (during a shutdown, no data has to be returned)
- *
- * If we don't have stored data to work from, read a SSL/TLS record first
- * (possibly multiple records if we still don't have anything to return).
- *
- * This function must handle any surprises the peer may have for us, such as
- * Alert records (e.g. close_notify), ChangeCipherSpec records (not really
- * a surprise, but handled as if it were), or renegotiation requests.
- * Also if record payloads contain fragments too small to process, we store
- * them until there is enough for the respective protocol (the record protocol
- * may use arbitrary fragmentation and even interleaving):
- * Change cipher spec protocol
- * just 1 byte needed, no need for keeping anything stored
- * Alert protocol
- * 2 bytes needed (AlertLevel, AlertDescription)
- * Handshake protocol
- * 4 bytes needed (HandshakeType, uint24 length) -- we just have
- * to detect unexpected Client Hello and Hello Request messages
- * here, anything else is handled by higher layers
- * Application data protocol
- * none of our business
- */
-int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
- {
- int al,i,j,ret;
- unsigned int n;
- SSL3_RECORD *rr;
- void (*cb)(const SSL *ssl,int type2,int val)=NULL;
-
- if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
- if (!ssl3_setup_read_buffer(s))
- return(-1);
-
- if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE)) ||
- (peek && (type != SSL3_RT_APPLICATION_DATA)))
- {
- SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
- if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
- /* (partially) satisfy request from storage */
- {
- unsigned char *src = s->s3->handshake_fragment;
- unsigned char *dst = buf;
- unsigned int k;
-
- /* peek == 0 */
- n = 0;
- while ((len > 0) && (s->s3->handshake_fragment_len > 0))
- {
- *dst++ = *src++;
- len--; s->s3->handshake_fragment_len--;
- n++;
- }
- /* move any remaining fragment bytes: */
- for (k = 0; k < s->s3->handshake_fragment_len; k++)
- s->s3->handshake_fragment[k] = *src++;
- return n;
- }
-
- /* Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */
-
- if (!s->in_handshake && SSL_in_init(s))
- {
- /* type == SSL3_RT_APPLICATION_DATA */
- i=s->handshake_func(s);
- if (i < 0) return(i);
- if (i == 0)
- {
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
- return(-1);
- }
- }
-start:
- s->rwstate=SSL_NOTHING;
-
- /* s->s3->rrec.type - is the type of record
- * s->s3->rrec.data, - data
- * s->s3->rrec.off, - offset into 'data' for next read
- * s->s3->rrec.length, - number of bytes. */
- rr = &(s->s3->rrec);
-
- /* get new packet if necessary */
- if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY))
- {
- ret=ssl3_get_record(s);
- if (ret <= 0) return(ret);
- }
-
- /* we now have a packet which can be read and processed */
-
- if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec,
- * reset by ssl3_get_finished */
- && (rr->type != SSL3_RT_HANDSHAKE))
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
- goto f_err;
- }
-
- /* If the other end has shut down, throw anything we read away
- * (even in 'peek' mode) */
- if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
- {
- rr->length=0;
- s->rwstate=SSL_NOTHING;
- return(0);
- }
-
-
- if (type == rr->type) /* SSL3_RT_APPLICATION_DATA or SSL3_RT_HANDSHAKE */
- {
- /* make sure that we are not getting application data when we
- * are doing a handshake for the first time */
- if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) &&
- (s->enc_read_ctx == NULL))
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_APP_DATA_IN_HANDSHAKE);
- goto f_err;
- }
-
- if (len <= 0) return(len);
-
- if ((unsigned int)len > rr->length)
- n = rr->length;
- else
- n = (unsigned int)len;
-
- memcpy(buf,&(rr->data[rr->off]),n);
- if (!peek)
- {
- rr->length-=n;
- rr->off+=n;
- if (rr->length == 0)
- {
- s->rstate=SSL_ST_READ_HEADER;
- rr->off=0;
- if (s->mode & SSL_MODE_RELEASE_BUFFERS && s->s3->rbuf.left == 0)
- ssl3_release_read_buffer(s);
- }
- }
- return(n);
- }
-
-
- /* If we get here, then type != rr->type; if we have a handshake
- * message, then it was unexpected (Hello Request or Client Hello). */
-
- /* In case of record types for which we have 'fragment' storage,
- * fill that so that we can process the data at a fixed place.
- */
- {
- unsigned int dest_maxlen = 0;
- unsigned char *dest = NULL;
- unsigned int *dest_len = NULL;
-
- if (rr->type == SSL3_RT_HANDSHAKE)
- {
- dest_maxlen = sizeof s->s3->handshake_fragment;
- dest = s->s3->handshake_fragment;
- dest_len = &s->s3->handshake_fragment_len;
- }
- else if (rr->type == SSL3_RT_ALERT)
- {
- dest_maxlen = sizeof s->s3->alert_fragment;
- dest = s->s3->alert_fragment;
- dest_len = &s->s3->alert_fragment_len;
- }
-#ifndef OPENSSL_NO_HEARTBEATS
- else if (rr->type == TLS1_RT_HEARTBEAT)
- {
- tls1_process_heartbeat(s);
-
- /* Exit and notify application to read again */
- rr->length = 0;
- s->rwstate=SSL_READING;
- BIO_clear_retry_flags(SSL_get_rbio(s));
- BIO_set_retry_read(SSL_get_rbio(s));
- return(-1);
- }
-#endif
-
- if (dest_maxlen > 0)
- {
- n = dest_maxlen - *dest_len; /* available space in 'dest' */
- if (rr->length < n)
- n = rr->length; /* available bytes */
-
- /* now move 'n' bytes: */
- while (n-- > 0)
- {
- dest[(*dest_len)++] = rr->data[rr->off++];
- rr->length--;
- }
-
- if (*dest_len < dest_maxlen)
- goto start; /* fragment was too small */
- }
- }
-
- /* s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE;
- * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT.
- * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */
-
- /* If we are a client, check for an incoming 'Hello Request': */
- if ((!s->server) &&
- (s->s3->handshake_fragment_len >= 4) &&
- (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
- (s->session != NULL) && (s->session->cipher != NULL))
- {
- s->s3->handshake_fragment_len = 0;
-
- if ((s->s3->handshake_fragment[1] != 0) ||
- (s->s3->handshake_fragment[2] != 0) ||
- (s->s3->handshake_fragment[3] != 0))
- {
- al=SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
- goto f_err;
- }
-
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->s3->handshake_fragment, 4, s, s->msg_callback_arg);
-
- if (SSL_is_init_finished(s) &&
- !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) &&
- !s->s3->renegotiate)
- {
- ssl3_renegotiate(s);
- if (ssl3_renegotiate_check(s))
- {
- i=s->handshake_func(s);
- if (i < 0) return(i);
- if (i == 0)
- {
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
- return(-1);
- }
-
- if (!(s->mode & SSL_MODE_AUTO_RETRY))
- {
- if (s->s3->rbuf.left == 0) /* no read-ahead left? */
- {
- BIO *bio;
- /* In the case where we try to read application data,
- * but we trigger an SSL handshake, we return -1 with
- * the retry option set. Otherwise renegotiation may
- * cause nasty problems in the blocking world */
- s->rwstate=SSL_READING;
- bio=SSL_get_rbio(s);
- BIO_clear_retry_flags(bio);
- BIO_set_retry_read(bio);
- return(-1);
- }
- }
- }
- }
- /* we either finished a handshake or ignored the request,
- * now try again to obtain the (application) data we were asked for */
- goto start;
- }
- /* If we are a server and get a client hello when renegotiation isn't
- * allowed send back a no renegotiation alert and carry on.
- * WARNING: experimental code, needs reviewing (steve)
- */
- if (s->server &&
- SSL_is_init_finished(s) &&
- !s->s3->send_connection_binding &&
- (s->version > SSL3_VERSION) &&
- (s->s3->handshake_fragment_len >= 4) &&
- (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
- (s->session != NULL) && (s->session->cipher != NULL) &&
- !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
-
- {
- /*s->s3->handshake_fragment_len = 0;*/
- rr->length = 0;
- ssl3_send_alert(s,SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
- goto start;
- }
- if (s->s3->alert_fragment_len >= 2)
- {
- int alert_level = s->s3->alert_fragment[0];
- int alert_descr = s->s3->alert_fragment[1];
-
- s->s3->alert_fragment_len = 0;
-
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_ALERT, s->s3->alert_fragment, 2, s, s->msg_callback_arg);
-
- if (s->info_callback != NULL)
- cb=s->info_callback;
- else if (s->ctx->info_callback != NULL)
- cb=s->ctx->info_callback;
-
- if (cb != NULL)
- {
- j = (alert_level << 8) | alert_descr;
- cb(s, SSL_CB_READ_ALERT, j);
- }
-
- if (alert_level == 1) /* warning */
- {
- s->s3->warn_alert = alert_descr;
- if (alert_descr == SSL_AD_CLOSE_NOTIFY)
- {
- s->shutdown |= SSL_RECEIVED_SHUTDOWN;
- return(0);
- }
- /* This is a warning but we receive it if we requested
- * renegotiation and the peer denied it. Terminate with
- * a fatal alert because if application tried to
- * renegotiatie it presumably had a good reason and
- * expects it to succeed.
- *
- * In future we might have a renegotiation where we
- * don't care if the peer refused it where we carry on.
- */
- else if (alert_descr == SSL_AD_NO_RENEGOTIATION)
- {
- al = SSL_AD_HANDSHAKE_FAILURE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_NO_RENEGOTIATION);
- goto f_err;
- }
-#ifdef SSL_AD_MISSING_SRP_USERNAME
- else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
- return(0);
-#endif
- }
- else if (alert_level == 2) /* fatal */
- {
- char tmp[16];
-
- s->rwstate=SSL_NOTHING;
- s->s3->fatal_alert = alert_descr;
- SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr);
- BIO_snprintf(tmp,sizeof tmp,"%d",alert_descr);
- ERR_add_error_data(2,"SSL alert number ",tmp);
- s->shutdown|=SSL_RECEIVED_SHUTDOWN;
- SSL_CTX_remove_session(s->ctx,s->session);
- return(0);
- }
- else
- {
- al=SSL_AD_ILLEGAL_PARAMETER;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNKNOWN_ALERT_TYPE);
- goto f_err;
- }
-
- goto start;
- }
-
- if (s->shutdown & SSL_SENT_SHUTDOWN) /* but we have not received a shutdown */
- {
- s->rwstate=SSL_NOTHING;
- rr->length=0;
- return(0);
- }
-
- if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC)
- {
- /* 'Change Cipher Spec' is just a single byte, so we know
- * exactly what the record payload has to look like */
- if ( (rr->length != 1) || (rr->off != 0) ||
- (rr->data[0] != SSL3_MT_CCS))
- {
- al=SSL_AD_ILLEGAL_PARAMETER;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
- goto f_err;
- }
-
- /* Check we have a cipher to change to */
- if (s->s3->tmp.new_cipher == NULL)
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
- goto f_err;
- }
-
- if (!(s->s3->flags & SSL3_FLAGS_CCS_OK))
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_CCS_RECEIVED_EARLY);
- goto f_err;
- }
-
- s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
-
- rr->length=0;
-
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg);
-
- s->s3->change_cipher_spec=1;
- if (!ssl3_do_change_cipher_spec(s))
- goto err;
- else
- goto start;
- }
-
- /* Unexpected handshake message (Client Hello, or protocol violation) */
- if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake)
- {
- if (((s->state&SSL_ST_MASK) == SSL_ST_OK) &&
- !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS))
- {
-#if 0 /* worked only because C operator preferences are not as expected (and
- * because this is not really needed for clients except for detecting
- * protocol violations): */
- s->state=SSL_ST_BEFORE|(s->server)
- ?SSL_ST_ACCEPT
- :SSL_ST_CONNECT;
-#else
- s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
-#endif
- s->renegotiate=1;
- s->new_session=1;
- }
- i=s->handshake_func(s);
- if (i < 0) return(i);
- if (i == 0)
- {
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_SSL_HANDSHAKE_FAILURE);
- return(-1);
- }
-
- if (!(s->mode & SSL_MODE_AUTO_RETRY))
- {
- if (s->s3->rbuf.left == 0) /* no read-ahead left? */
- {
- BIO *bio;
- /* In the case where we try to read application data,
- * but we trigger an SSL handshake, we return -1 with
- * the retry option set. Otherwise renegotiation may
- * cause nasty problems in the blocking world */
- s->rwstate=SSL_READING;
- bio=SSL_get_rbio(s);
- BIO_clear_retry_flags(bio);
- BIO_set_retry_read(bio);
- return(-1);
- }
- }
- goto start;
- }
-
- switch (rr->type)
- {
- default:
-#ifndef OPENSSL_NO_TLS
- /* TLS up to v1.1 just ignores unknown message types:
- * TLS v1.2 give an unexpected message alert.
- */
- if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION)
- {
- rr->length = 0;
- goto start;
- }
-#endif
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
- goto f_err;
- case SSL3_RT_CHANGE_CIPHER_SPEC:
- case SSL3_RT_ALERT:
- case SSL3_RT_HANDSHAKE:
- /* we already handled all of these, with the possible exception
- * of SSL3_RT_HANDSHAKE when s->in_handshake is set, but that
- * should not happen when type != rr->type */
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,ERR_R_INTERNAL_ERROR);
- goto f_err;
- case SSL3_RT_APPLICATION_DATA:
- /* At this point, we were expecting handshake data,
- * but have application data. If the library was
- * running inside ssl3_read() (i.e. in_read_app_data
- * is set) and it makes sense to read application data
- * at this point (session renegotiation not yet started),
- * we will indulge it.
- */
- if (s->s3->in_read_app_data &&
- (s->s3->total_renegotiations != 0) &&
- ((
- (s->state & SSL_ST_CONNECT) &&
- (s->state >= SSL3_ST_CW_CLNT_HELLO_A) &&
- (s->state <= SSL3_ST_CR_SRVR_HELLO_A)
- ) || (
- (s->state & SSL_ST_ACCEPT) &&
- (s->state <= SSL3_ST_SW_HELLO_REQ_A) &&
- (s->state >= SSL3_ST_SR_CLNT_HELLO_A)
- )
- ))
- {
- s->s3->in_read_app_data=2;
- return(-1);
- }
- else
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_UNEXPECTED_RECORD);
- goto f_err;
- }
- }
- /* not reached */
-
-f_err:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
-err:
- return(-1);
- }
-
-int ssl3_do_change_cipher_spec(SSL *s)
- {
- int i;
- const char *sender;
- int slen;
-
- if (s->state & SSL_ST_ACCEPT)
- i=SSL3_CHANGE_CIPHER_SERVER_READ;
- else
- i=SSL3_CHANGE_CIPHER_CLIENT_READ;
-
- if (s->s3->tmp.key_block == NULL)
- {
- if (s->session == NULL || s->session->master_key_length == 0)
- {
- /* might happen if dtls1_read_bytes() calls this */
- SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,SSL_R_CCS_RECEIVED_EARLY);
- return (0);
- }
-
- s->session->cipher=s->s3->tmp.new_cipher;
- if (!s->method->ssl3_enc->setup_key_block(s)) return(0);
- }
-
- if (!s->method->ssl3_enc->change_cipher_state(s,i))
- return(0);
-
- /* we have to record the message digest at
- * this point so we can get it before we read
- * the finished message */
- if (s->state & SSL_ST_CONNECT)
- {
- sender=s->method->ssl3_enc->server_finished_label;
- slen=s->method->ssl3_enc->server_finished_label_len;
- }
- else
- {
- sender=s->method->ssl3_enc->client_finished_label;
- slen=s->method->ssl3_enc->client_finished_label_len;
- }
-
- i = s->method->ssl3_enc->final_finish_mac(s,
- sender,slen,s->s3->tmp.peer_finish_md);
- if (i == 0)
- {
- SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- s->s3->tmp.peer_finish_md_len = i;
-
- return(1);
- }
-
-int ssl3_send_alert(SSL *s, int level, int desc)
- {
- /* Map tls/ssl alert value to correct one */
- desc=s->method->ssl3_enc->alert_value(desc);
- if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
- desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have protocol_version alerts */
- if (desc < 0) return -1;
- /* If a fatal one, remove from cache */
- if ((level == 2) && (s->session != NULL))
- SSL_CTX_remove_session(s->ctx,s->session);
-
- s->s3->alert_dispatch=1;
- s->s3->send_alert[0]=level;
- s->s3->send_alert[1]=desc;
- if (s->s3->wbuf.left == 0) /* data still being written out? */
- return s->method->ssl_dispatch_alert(s);
- /* else data is still being written out, we will get written
- * some time in the future */
- return -1;
- }
-
-int ssl3_dispatch_alert(SSL *s)
- {
- int i,j;
- void (*cb)(const SSL *ssl,int type,int val)=NULL;
-
- s->s3->alert_dispatch=0;
- i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
- if (i <= 0)
- {
- s->s3->alert_dispatch=1;
- }
- else
- {
- /* Alert sent to BIO. If it is important, flush it now.
- * If the message does not get sent due to non-blocking IO,
- * we will not worry too much. */
- if (s->s3->send_alert[0] == SSL3_AL_FATAL)
- (void)BIO_flush(s->wbio);
-
- if (s->msg_callback)
- s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg);
-
- if (s->info_callback != NULL)
- cb=s->info_callback;
- else if (s->ctx->info_callback != NULL)
- cb=s->ctx->info_callback;
-
- if (cb != NULL)
- {
- j=(s->s3->send_alert[0]<<8)|s->s3->send_alert[1];
- cb(s,SSL_CB_WRITE_ALERT,j);
- }
- }
- return(i);
- }
projects / cassiopeia.git / blobdiff