*/
#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 "ssl_locl.h"
+#include <openssl/rand.h>
+
+#ifndef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
+#endif
+
+#if defined(OPENSSL_SMALL_FOOTPRINT) || \
+ !( defined(AES_ASM) && ( \
+ defined(__x86_64) || defined(__x86_64__) || \
+ defined(_M_AMD64) || defined(_M_X64) || \
+ defined(__INTEL__) ) \
+ )
+# undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
+#endif
static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
unsigned int len, int create_empty_fragment);
-static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
- unsigned int len);
static int ssl3_get_record(SSL *s);
-static int do_compress(SSL *ssl);
-static int do_uncompress(SSL *ssl);
-static int do_change_cipher_spec(SSL *ssl);
-/* used only by ssl3_get_record */
-static int ssl3_read_n(SSL *s, int n, int max, int extend)
+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.
* (If s->read_ahead is set, 'max' bytes may be stored in rbuf
* [plus s->packet_length bytes if extend == 1].)
*/
- int i,off,newb;
+ 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 (s->s3->rbuf.left == 0)
- s->s3->rbuf.offset = 0;
- s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset;
+ 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_IS_DTLS(s))
+ {
+ if (left > 0 && n > left)
+ n = left;
+ }
+
/* if there is enough in the buffer from a previous read, take some */
- if (s->s3->rbuf.left >= (int)n)
+ if (left >= n)
{
s->packet_length+=n;
- s->s3->rbuf.left-=n;
- s->s3->rbuf.offset+=n;
+ rb->left=left-n;
+ rb->offset+=n;
return(n);
}
/* else we need to read more data */
- if (!s->read_ahead)
- max=n;
- {
- /* avoid buffer overflow */
- int max_max = s->s3->rbuf.len - s->packet_length;
- if (max > max_max)
- max = max_max;
- }
- if (n > max) /* does not happen */
+ 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;
}
- off = s->packet_length;
- newb = s->s3->rbuf.left;
- /* Move any available bytes to front of buffer:
- * 'off' bytes already pointed to by 'packet',
- * 'newb' extra ones at the end */
- if (s->packet != s->s3->rbuf.buf)
+ if (!s->read_ahead)
+ /* ignore max parameter */
+ max = n;
+ else
{
- /* off > 0 */
- memmove(s->s3->rbuf.buf, s->packet, off+newb);
- s->packet = s->s3->rbuf.buf;
+ if (max < n)
+ max = n;
+ if (max > (int)(rb->len - rb->offset))
+ max = rb->len - rb->offset;
}
- while (newb < n)
+ while (left < n)
{
- /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need
- * to read in more until we have off+n (up to off+max if possible) */
+ /* 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, &(s->s3->rbuf.buf[off+newb]), max-newb);
+ i=BIO_read(s->rbio,pkt+len+left, max-left);
}
else
{
if (i <= 0)
{
- s->s3->rbuf.left = newb;
+ rb->left = left;
+ if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
+ !SSL_IS_DTLS(s))
+ if (len+left == 0)
+ ssl3_release_read_buffer(s);
return(i);
}
- newb+=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_IS_DTLS(s))
+ {
+ if (n > left)
+ n = left; /* makes the while condition false */
+ }
}
/* done reading, now the book-keeping */
- s->s3->rbuf.offset = off + n;
- s->s3->rbuf.left = newb - n;
+ 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.
unsigned char *p;
unsigned char md[EVP_MAX_MD_SIZE];
short version;
- unsigned int mac_size;
- int clear=0,extra;
+ unsigned mac_size;
+ size_t extra;
+ unsigned empty_record_count = 0;
rr= &(s->s3->rrec);
sess=s->session;
extra=SSL3_RT_MAX_EXTRA;
else
extra=0;
- if (extra != (s->s3->rbuf.len - SSL3_RT_MAX_PACKET_SIZE))
+ if (extra && !s->s3->init_extra)
{
- /* actually likely an application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
+ /* 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;
s->rstate=SSL_ST_READ_BODY;
p=s->packet;
+ if (s->msg_callback)
+ s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
/* Pull apart the header into the SSL3_RECORD */
rr->type= *(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)
- {
- s->first_packet=0;
- }
- else
+ if (!s->first_packet)
{
if (version != s->version)
{
SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- /* Send back error using their
- * version number :-) */
- s->version=version;
+ 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;
}
goto err;
}
- if (rr->length >
- (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
+ 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);
/* s->rstate == SSL_ST_READ_BODY, get and decode the data */
- if (rr->length > (s->packet_length-SSL3_RT_HEADER_LENGTH))
+ if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
{
/* now s->packet_length == SSL3_RT_HEADER_LENGTH */
i=rr->length;
* rr->length bytes of encrypted compressed stuff. */
/* check is not needed I believe */
- if (rr->length > (unsigned int)SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
+ 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);
/* decrypt in place in 'rr->input' */
rr->data=rr->input;
+ rr->orig_len=rr->length;
+ /* If in encrypt-then-mac mode calculate mac from encrypted record.
+ * All the details below are public so no timing details can leak.
+ */
+ if (SSL_USE_ETM(s) && s->read_hash)
+ {
+ unsigned char *mac;
+ mac_size=EVP_MD_CTX_size(s->read_hash);
+ OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
+ if (rr->length < mac_size)
+ {
+ al=SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
+ goto f_err;
+ }
+ rr->length -= mac_size;
+ mac = rr->data + rr->length;
+ i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
+ if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
+ {
+ al=SSL_AD_BAD_RECORD_MAC;
+ SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
+ goto f_err;
+ }
+ }
enc_err = s->method->ssl3_enc->enc(s,0);
- if (enc_err <= 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)
{
- if (enc_err == 0)
- /* SSLerr() and ssl3_send_alert() have been called */
- goto err;
-
- /* otherwise enc_err == -1 */
- goto decryption_failed_or_bad_record_mac;
+ al=SSL_AD_DECRYPTION_FAILED;
+ SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
+ goto f_err;
}
#ifdef TLS_DEBUG
#endif
/* r->length is now the compressed data plus mac */
- if ( (sess == NULL) ||
- (s->enc_read_ctx == NULL) ||
- (s->read_hash == NULL))
- clear=1;
-
- if (!clear)
+ if ((sess != NULL) &&
+ (s->enc_read_ctx != NULL) &&
+ (EVP_MD_CTX_md(s->read_hash) != NULL) && !SSL_USE_ETM(s))
{
- mac_size=EVP_MD_size(s->read_hash);
-
- if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size)
- {
-#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG);
- goto f_err;
-#else
- goto decryption_failed_or_bad_record_mac;
-#endif
- }
- /* check the MAC for rr->input (it's in mac_size bytes at the tail) */
- if (rr->length < mac_size)
+ /* 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);
+
+ /* 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 (rr->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 &&
+ rr->orig_len < mac_size+1))
{
-#if 0 /* OK only for stream ciphers */
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
goto f_err;
-#else
- goto decryption_failed_or_bad_record_mac;
-#endif
}
- rr->length-=mac_size;
- i=s->method->ssl3_enc->mac(s,md,0);
- if (memcmp(md,&(rr->data[rr->length]),mac_size) != 0)
+
+ 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);
+ rr->length -= mac_size;
+ }
+ else
{
- goto decryption_failed_or_bad_record_mac;
+ /* In this case there's no padding, so |rec->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 occurred -- 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 >
- (unsigned int)SSL3_RT_MAX_COMPRESSED_LENGTH+extra)
+ 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 (!do_uncompress(s))
+ if (!ssl3_do_uncompress(s))
{
al=SSL_AD_DECOMPRESSION_FAILURE;
SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BAD_DECOMPRESSION);
}
}
- if (rr->length > (unsigned int)SSL3_RT_MAX_PLAIN_LENGTH+extra)
+ 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);
s->packet_length=0;
/* just read a 0 length packet */
- if (rr->length == 0) goto again;
+ 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);
-decryption_failed_or_bad_record_mac:
- /* 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 logfile) */
- al=SSL_AD_BAD_RECORD_MAC;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
return(ret);
}
-static int do_uncompress(SSL *ssl)
+int ssl3_do_uncompress(SSL *ssl)
{
+#ifndef OPENSSL_NO_COMP
int i;
SSL3_RECORD *rr;
else
rr->length=i;
rr->data=rr->comp;
-
+#endif
return(1);
}
-static int do_compress(SSL *ssl)
+int ssl3_do_compress(SSL *ssl)
{
+#ifndef OPENSSL_NO_COMP
int i;
SSL3_RECORD *wr;
wr->length=i;
wr->input=wr->data;
+#endif
return(1);
}
int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
{
const unsigned char *buf=buf_;
- unsigned int tot,n,nw;
+ int tot;
+ unsigned int n,nw;
+#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+ unsigned int max_send_fragment;
+#endif
+ SSL3_BUFFER *wb=&(s->s3->wbuf);
int i;
+ unsigned int u_len = (unsigned int)len;
+
+ if (len < 0)
+ {
+ SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_SSL_NEGATIVE_LENGTH);
+ return -1;
+ }
s->rwstate=SSL_NOTHING;
+ OPENSSL_assert(s->s3->wnum <= INT_MAX);
tot=s->s3->wnum;
s->s3->wnum=0;
}
}
+ /* 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);
+ }
+
+ /* first check if there is a SSL3_BUFFER still being written
+ * out. This will happen with non blocking IO */
+ if (wb->left != 0)
+ {
+ i = ssl3_write_pending(s,type,&buf[tot],s->s3->wpend_tot);
+ if (i<=0)
+ {
+ /* XXX should we ssl3_release_write_buffer if i<0? */
+ s->s3->wnum=tot;
+ return i;
+ }
+ tot += i; /* this might be last fragment */
+ }
+
+#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+ /*
+ * Depending on platform multi-block can deliver several *times*
+ * better performance. Downside is that it has to allocate
+ * jumbo buffer to accomodate up to 8 records, but the
+ * compromise is considered worthy.
+ */
+ if (type==SSL3_RT_APPLICATION_DATA &&
+ u_len >= 4*(max_send_fragment=s->max_send_fragment) &&
+ s->compress==NULL && s->msg_callback==NULL &&
+ !SSL_USE_ETM(s) && SSL_USE_EXPLICIT_IV(s) &&
+ EVP_CIPHER_flags(s->enc_write_ctx->cipher)&EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
+ {
+ unsigned char aad[13];
+ EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
+ int packlen;
+
+ /* minimize address aliasing conflicts */
+ if ((max_send_fragment&0xfff) == 0)
+ max_send_fragment -= 512;
+
+ if (tot==0 || wb->buf==NULL) /* allocate jumbo buffer */
+ {
+ ssl3_release_write_buffer(s);
+
+ packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+ EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
+ max_send_fragment,NULL);
+
+ if (u_len >= 8*max_send_fragment) packlen *= 8;
+ else packlen *= 4;
+
+ wb->buf=OPENSSL_malloc(packlen);
+ wb->len=packlen;
+ }
+ else if (tot==len) /* done? */
+ {
+ OPENSSL_free(wb->buf); /* free jumbo buffer */
+ wb->buf = NULL;
+ return tot;
+ }
+
+ n=(len-tot);
+ for (;;)
+ {
+ if (n < 4*max_send_fragment)
+ {
+ OPENSSL_free(wb->buf); /* free jumbo buffer */
+ wb->buf = NULL;
+ break;
+ }
+
+ if (s->s3->alert_dispatch)
+ {
+ i=s->method->ssl_dispatch_alert(s);
+ if (i <= 0)
+ {
+ s->s3->wnum=tot;
+ return i;
+ }
+ }
+
+ if (n >= 8*max_send_fragment)
+ nw = max_send_fragment*(mb_param.interleave=8);
+ else
+ nw = max_send_fragment*(mb_param.interleave=4);
+
+ memcpy(aad,s->s3->write_sequence,8);
+ aad[8]=type;
+ aad[9]=(unsigned char)(s->version>>8);
+ aad[10]=(unsigned char)(s->version);
+ aad[11]=0;
+ aad[12]=0;
+ mb_param.out = NULL;
+ mb_param.inp = aad;
+ mb_param.len = nw;
+
+ packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+ EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
+ sizeof(mb_param),&mb_param);
+
+ if (packlen<=0 || packlen>(int)wb->len) /* never happens */
+ {
+ OPENSSL_free(wb->buf); /* free jumbo buffer */
+ wb->buf = NULL;
+ break;
+ }
+
+ mb_param.out = wb->buf;
+ mb_param.inp = &buf[tot];
+ mb_param.len = nw;
+
+ if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+ EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
+ sizeof(mb_param),&mb_param)<=0)
+ return -1;
+
+ s->s3->write_sequence[7] += mb_param.interleave;
+ if (s->s3->write_sequence[7] < mb_param.interleave)
+ {
+ int j=6;
+ while (j>=0 && (++s->s3->write_sequence[j--])==0) ;
+ }
+
+ wb->offset = 0;
+ wb->left = packlen;
+
+ s->s3->wpend_tot = nw;
+ s->s3->wpend_buf = &buf[tot];
+ s->s3->wpend_type= type;
+ s->s3->wpend_ret = nw;
+
+ i = ssl3_write_pending(s,type,&buf[tot],nw);
+ if (i<=0)
+ {
+ if (i<0)
+ {
+ OPENSSL_free(wb->buf);
+ wb->buf = NULL;
+ }
+ s->s3->wnum=tot;
+ return i;
+ }
+ if (i==(int)n)
+ {
+ OPENSSL_free(wb->buf); /* free jumbo buffer */
+ wb->buf = NULL;
+ return tot+i;
+ }
+ n-=i;
+ tot+=i;
+ }
+ }
+ else
+#endif
+ if (tot==len) /* done? */
+ {
+ if (s->mode & SSL_MODE_RELEASE_BUFFERS &&
+ !SSL_IS_DTLS(s))
+ ssl3_release_write_buffer(s);
+
+ return tot;
+ }
+
+
n=(len-tot);
for (;;)
{
- if (n > SSL3_RT_MAX_PLAIN_LENGTH)
- nw=SSL3_RT_MAX_PLAIN_LENGTH;
+ 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)
{
+ /* XXX should we ssl3_release_write_buffer if i<0? */
s->s3->wnum=tot;
return i;
}
/* next chunk of data should get another prepended empty fragment
* in ciphersuites with known-IV weakness: */
s->s3->empty_fragment_done = 0;
-
+
+ if ((i==(int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS &&
+ !SSL_IS_DTLS(s))
+ ssl3_release_write_buffer(s);
+
return tot+i;
}
{
unsigned char *p,*plen;
int i,mac_size,clear=0;
- int prefix_len = 0;
+ int prefix_len=0;
+ int eivlen;
+ long align=0;
SSL3_RECORD *wr;
- SSL3_BUFFER *wb;
+ 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 (s->s3->wbuf.left != 0)
+ 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=ssl3_dispatch_alert(s);
+ 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);
- wb= &(s->s3->wbuf);
sess=s->session;
if ( (sess == NULL) ||
(s->enc_write_ctx == NULL) ||
- (s->write_hash == 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;
-
- if (clear)
+#endif
mac_size=0;
+ }
else
- mac_size=EVP_MD_size(s->write_hash);
+ {
+ mac_size=EVP_MD_CTX_size(s->write_hash);
+ if (mac_size < 0)
+ goto err;
+ }
+
+#if 0 && !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+ if (type==SSL3_RT_APPLICATION_DATA && s->compress==NULL &&
+ !SSL_USE_ETM(s) && SSL_USE_EXPLICIT_IV(s) && /*!SSL_IS_DTLS(s) &&*/
+ EVP_CIPHER_flags(s->enc_write_ctx->cipher)&EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
+ do {
+ unsigned char aad[13];
+ EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param = {NULL,aad,sizeof(aad),0};
+ int packlen;
+
+ memcpy(aad,s->s3->write_sequence,8);
+ aad[8]=type;
+ aad[9]=(unsigned char)(s->version>>8);
+ aad[10]=(unsigned char)(s->version);
+ aad[11]=(unsigned char)(len>>8);
+ aad[12]=(unsigned char)len;
+ packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+ EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
+ sizeof(mb_param),&mb_param);
+
+ if (packlen==0 || packlen > wb->len) break;
+
+ mb_param.out = wb->buf;
+ mb_param.inp = buf;
+ mb_param.len = len;
+ EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+ EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
+ sizeof(mb_param),&mb_param);
+
+ s->s3->write_sequence[7] += mb_param.interleave;
+ if (s->s3->write_sequence[7] < mb_param.interleave)
+ {
+ int j=6;
+ while (j>=0 && (++s->s3->write_sequence[j--])==0) ;
+ }
+
+ wb->offset=0;
+ wb->left = packlen;
+
+ /* 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);
+ } while (0);
+#endif
/* 'create_empty_fragment' is true only when this function calls itself */
if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done)
if (prefix_len <= 0)
goto err;
- if (s->s3->wbuf.len < prefix_len + SSL3_RT_MAX_PACKET_SIZE)
+ 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);
s->s3->empty_fragment_done = 1;
}
- p = wb->buf + prefix_len;
+ 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 */
wr->type=type;
*(p++)=(s->version>>8);
- *(p++)=s->version&0xff;
+ /* 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 appropriate version flag */
+ if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s))
+ {
+ 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;
+ wr->data=p + eivlen;
wr->length=(int)len;
wr->input=(unsigned char *)buf;
/* first we compress */
if (s->compress != NULL)
{
- if (!do_compress(s))
+ if (!ssl3_do_compress(s))
{
SSLerr(SSL_F_DO_SSL3_WRITE,SSL_R_COMPRESSION_FAILURE);
goto err;
* from wr->input. Length should be wr->length.
* wr->data still points in the wb->buf */
- if (mac_size != 0)
+ if (!SSL_USE_ETM(s) && mac_size != 0)
{
- s->method->ssl3_enc->mac(s,&(p[wr->length]),1);
+ 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;
}
- /* ssl3_enc can only have an error on read */
- s->method->ssl3_enc->enc(s,1);
+ wr->input=p;
+ wr->data=p;
+
+ if (eivlen)
+ {
+ /* if (RAND_pseudo_bytes(p, eivlen) <= 0)
+ goto err; */
+ wr->length += eivlen;
+ }
+
+ if(s->method->ssl3_enc->enc(s,1)<1) goto err;
+
+ if (SSL_USE_ETM(s) && mac_size != 0)
+ {
+ if (s->method->ssl3_enc->mac(s,p + wr->length,1) < 0)
+ goto err;
+ wr->length+=mac_size;
+ }
/* record length after mac and block padding */
s2n(wr->length,plen);
+ if (s->msg_callback)
+ s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, s->msg_callback_arg);
+
/* we should now have
* wr->data pointing to the encrypted data, which is
* wr->length long */
/* now let's set up wb */
wb->left = prefix_len + wr->length;
- wb->offset = 0;
/* memorize arguments so that ssl3_write_pending can detect bad write retries later */
s->s3->wpend_tot=len;
}
/* if s->s3->wbuf.left != 0, we need to call this */
-static int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
- unsigned int len)
+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->rwstate=SSL_WRITING;
i=BIO_write(s->wbio,
- (char *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]),
- (unsigned int)s->s3->wbuf.left);
+ (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 == s->s3->wbuf.left)
+ if (i == wb->left)
{
- s->s3->wbuf.left=0;
+ wb->left=0;
+ wb->offset+=i;
s->rwstate=SSL_NOTHING;
return(s->s3->wpend_ret);
}
- else if (i <= 0)
+ 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);
- s->s3->wbuf.offset+=i;
- s->s3->wbuf.left-=i;
+ }
+ wb->offset+=i;
+ wb->left-=i;
}
}
void (*cb)(const SSL *ssl,int type2,int val)=NULL;
if (s->s3->rbuf.buf == NULL) /* Not initialized yet */
- if (!ssl3_setup_buffers(s))
+ if (!ssl3_setup_read_buffer(s))
return(-1);
- if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) ||
+ 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);
{
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
- goto err;
+ goto f_err;
}
/* If the other end has shut down, throw anything we read away
{
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);
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)
{
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_HELLO_REQUEST);
- goto err;
+ goto f_err;
}
if (s->msg_callback)
* 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];
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 */
{
if ( (rr->length != 1) || (rr->off != 0) ||
(rr->data[0] != SSL3_MT_CCS))
{
- i=SSL_AD_ILLEGAL_PARAMETER;
+ al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_SSL3_READ_BYTES,SSL_R_BAD_CHANGE_CIPHER_SPEC);
- goto err;
+ 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 (!do_change_cipher_spec(s))
+ if (!ssl3_do_change_cipher_spec(s))
goto err;
else
goto start;
#else
s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT;
#endif
+ s->renegotiate=1;
s->new_session=1;
}
i=s->handshake_func(s);
{
default:
#ifndef OPENSSL_NO_TLS
- /* TLS just ignores unknown message types */
- if (s->version == TLS1_VERSION)
+ /* 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;
return(-1);
}
-static int do_change_cipher_spec(SSL *s)
+int ssl3_do_change_cipher_spec(SSL *s)
{
int i;
const char *sender;
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);
}
slen=s->method->ssl3_enc->client_finished_label_len;
}
- s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
- &(s->s3->finish_dgst1),
- &(s->s3->finish_dgst2),
+ 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);
}
-void ssl3_send_alert(SSL *s, int level, int desc)
+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;
+ if (desc < 0) return -1;
/* If a fatal one, remove from cache */
- if ((level == 2) && (s->session != NULL))
+ if ((level == SSL3_AL_FATAL) && (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? */
- ssl3_dispatch_alert(s);
+ 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)
projects / openssl.git / blobdiff