#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
if ((end) - (start) <= 8) { \
- int ii; \
+ long ii; \
for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
} else { \
- int ii; \
+ long ii; \
bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 7)]; \
- for (ii = (((start) >> 3) + 1); ii < ((end) >> 3); ii++) bitmask[ii] = 0xff; \
- bitmask[((end) >> 3)] |= bitmask_end_values[((end) & 7)]; \
+ for (ii = (((start) >> 3) + 1); ii < ((((end) - 1)) >> 3); ii++) bitmask[ii] = 0xff; \
+ bitmask[(((end) - 1) >> 3)] |= bitmask_end_values[((end) & 7)]; \
} }
#define RSMBLY_BITMASK_IS_COMPLETE(bitmask, msg_len, is_complete) { \
- int ii; \
+ long ii; \
+ OPENSSL_assert((msg_len) > 0); \
is_complete = 1; \
- if (bitmask[((msg_len) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
- if (is_complete) for (ii = 0; ii < ((msg_len) >> 3); ii++) \
- if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
+ if (bitmask[(((msg_len) - 1) >> 3)] != bitmask_end_values[((msg_len) & 7)]) is_complete = 0; \
+ if (is_complete) for (ii = (((msg_len) - 1) >> 3) - 1; ii >= 0 ; ii--) \
+ if (bitmask[ii] != 0xff) { is_complete = 0; break; } }
#if 0
#define RSMBLY_BITMASK_PRINT(bitmask, msg_len) { \
- int ii; \
+ long ii; \
printf("bitmask: "); for (ii = 0; ii < (msg_len); ii++) \
printf("%d ", (bitmask[ii >> 3] & (1 << (ii & 7))) >> (ii & 7)); \
printf("\n"); }
#endif
static unsigned char bitmask_start_values[] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80};
-static unsigned char bitmask_end_values[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
+static unsigned char bitmask_end_values[] = {0xff, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f};
/* XDTLS: figure out the right values */
-static unsigned int g_probable_mtu[] = {1500 - 28, 512 - 28, 256 - 28};
+static const unsigned int g_probable_mtu[] = {1500, 512, 256};
-static unsigned int dtls1_min_mtu(void);
-static unsigned int dtls1_guess_mtu(unsigned int curr_mtu);
static void dtls1_fix_message_header(SSL *s, unsigned long frag_off,
unsigned long frag_len);
static unsigned char *dtls1_write_message_header(SSL *s,
return frag;
}
-static void
-dtls1_hm_fragment_free(hm_fragment *frag)
+void dtls1_hm_fragment_free(hm_fragment *frag)
{
+
+ if (frag->msg_header.is_ccs)
+ {
+ EVP_CIPHER_CTX_free(frag->msg_header.saved_retransmit_state.enc_write_ctx);
+ EVP_MD_CTX_destroy(frag->msg_header.saved_retransmit_state.write_hash);
+ }
if (frag->fragment) OPENSSL_free(frag->fragment);
if (frag->reassembly) OPENSSL_free(frag->reassembly);
OPENSSL_free(frag);
}
-/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
-int dtls1_do_write(SSL *s, int type)
- {
- int ret;
- int curr_mtu;
- unsigned int len, frag_off, mac_size, blocksize;
+static int dtls1_query_mtu(SSL *s)
+{
+ if(s->d1->link_mtu)
+ {
+ s->d1->mtu = s->d1->link_mtu-BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
+ s->d1->link_mtu = 0;
+ }
/* AHA! Figure out the MTU, and stick to the right size */
- if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
+ if (s->d1->mtu < dtls1_min_mtu(s))
{
- s->d1->mtu =
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
-
- /* I've seen the kernel return bogus numbers when it doesn't know
- * (initial write), so just make sure we have a reasonable number */
- if ( s->d1->mtu < dtls1_min_mtu())
+ if(!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
{
- s->d1->mtu = 0;
- s->d1->mtu = dtls1_guess_mtu(s->d1->mtu);
- BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
- s->d1->mtu, NULL);
+ s->d1->mtu =
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
+
+ /* I've seen the kernel return bogus numbers when it doesn't know
+ * (initial write), so just make sure we have a reasonable number */
+ if (s->d1->mtu < dtls1_min_mtu(s))
+ {
+ /* Set to min mtu */
+ s->d1->mtu = dtls1_min_mtu(s);
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SET_MTU,
+ s->d1->mtu, NULL);
+ }
}
+ else
+ return 0;
}
-#if 0
- mtu = s->d1->mtu;
-
- fprintf(stderr, "using MTU = %d\n", mtu);
-
- mtu -= (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
-
- curr_mtu = mtu - BIO_wpending(SSL_get_wbio(s));
-
- if ( curr_mtu > 0)
- mtu = curr_mtu;
- else if ( ( ret = BIO_flush(SSL_get_wbio(s))) <= 0)
- return ret;
+ return 1;
+}
- if ( BIO_wpending(SSL_get_wbio(s)) + s->init_num >= mtu)
- {
- ret = BIO_flush(SSL_get_wbio(s));
- if ( ret <= 0)
- return ret;
- mtu = s->d1->mtu - (DTLS1_HM_HEADER_LENGTH + DTLS1_RT_HEADER_LENGTH);
- }
+/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
+int dtls1_do_write(SSL *s, int type)
+ {
+ int ret;
+ unsigned int curr_mtu;
+ int retry = 1;
+ unsigned int len, frag_off, mac_size, blocksize, used_len;
- OPENSSL_assert(mtu > 0); /* should have something reasonable now */
+ if(!dtls1_query_mtu(s))
+ return -1;
-#endif
+ OPENSSL_assert(s->d1->mtu >= dtls1_min_mtu(s)); /* should have something reasonable now */
if ( s->init_off == 0 && type == SSL3_RT_HANDSHAKE)
OPENSSL_assert(s->init_num ==
(int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH);
if (s->write_hash)
- mac_size = EVP_MD_CTX_size(s->write_hash);
+ {
+ if (s->enc_write_ctx && EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_GCM_MODE)
+ mac_size = 0;
+ else
+ mac_size = EVP_MD_CTX_size(s->write_hash);
+ }
else
mac_size = 0;
if (s->enc_write_ctx &&
- (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE))
+ (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CBC_MODE))
blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher);
else
blocksize = 0;
frag_off = 0;
- while( s->init_num)
+ /* s->init_num shouldn't ever be < 0...but just in case */
+ while(s->init_num > 0)
{
- curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
- DTLS1_RT_HEADER_LENGTH - mac_size - blocksize;
+ used_len = BIO_wpending(SSL_get_wbio(s)) + DTLS1_RT_HEADER_LENGTH
+ + mac_size + blocksize;
+ if(s->d1->mtu > used_len)
+ curr_mtu = s->d1->mtu - used_len;
+ else
+ curr_mtu = 0;
if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
{
ret = BIO_flush(SSL_get_wbio(s));
if ( ret <= 0)
return ret;
- curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH -
- mac_size - blocksize;
+ used_len = DTLS1_RT_HEADER_LENGTH + mac_size + blocksize;
+ if(s->d1->mtu > used_len + DTLS1_HM_HEADER_LENGTH)
+ {
+ curr_mtu = s->d1->mtu - used_len;
+ }
+ else
+ {
+ /* Shouldn't happen */
+ return -1;
+ }
}
- if ( s->init_num > curr_mtu)
+ /* We just checked that s->init_num > 0 so this cast should be safe */
+ if (((unsigned int)s->init_num) > curr_mtu)
len = curr_mtu;
else
len = s->init_num;
+ /* Shouldn't ever happen */
+ if(len > INT_MAX)
+ len = INT_MAX;
/* XDTLS: this function is too long. split out the CCS part */
if ( type == SSL3_RT_HANDSHAKE)
s->init_off -= DTLS1_HM_HEADER_LENGTH;
s->init_num += DTLS1_HM_HEADER_LENGTH;
- /* write atleast DTLS1_HM_HEADER_LENGTH bytes */
- if ( len <= DTLS1_HM_HEADER_LENGTH)
- len += DTLS1_HM_HEADER_LENGTH;
+ /* We just checked that s->init_num > 0 so this cast should be safe */
+ if (((unsigned int)s->init_num) > curr_mtu)
+ len = curr_mtu;
+ else
+ len = s->init_num;
}
+ /* Shouldn't ever happen */
+ if(len > INT_MAX)
+ len = INT_MAX;
+
+ if ( len < DTLS1_HM_HEADER_LENGTH )
+ {
+ /*
+ * len is so small that we really can't do anything sensible
+ * so fail
+ */
+ return -1;
+ }
dtls1_fix_message_header(s, frag_off,
len - DTLS1_HM_HEADER_LENGTH);
dtls1_write_message_header(s, (unsigned char *)&s->init_buf->data[s->init_off]);
-
- OPENSSL_assert(len >= DTLS1_HM_HEADER_LENGTH);
}
ret=dtls1_write_bytes(s,type,&s->init_buf->data[s->init_off],
* is fine and wait for an alert to handle the
* retransmit
*/
- if ( BIO_ctrl(SSL_get_wbio(s),
+ if ( retry && BIO_ctrl(SSL_get_wbio(s),
BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0 )
- s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
- BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
+ {
+ if(!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
+ {
+ if(!dtls1_query_mtu(s))
+ return -1;
+ /* Have one more go */
+ retry = 0;
+ }
+ else
+ return -1;
+ }
else
+ {
return(-1);
+ }
}
else
{
again:
i = dtls1_get_message_fragment(s, st1, stn, max, ok);
if ( i == DTLS1_HM_BAD_FRAGMENT ||
- i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
+ i == DTLS1_HM_FRAGMENT_RETRY)
+ {
+ /* bad fragment received */
goto again;
+ }
else if ( i <= 0 && !*ok)
+ {
return i;
+ }
p = (unsigned char *)s->init_buf->data;
msg_len = msg_hdr->msg_len;
memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
- s->d1->handshake_read_seq++;
- /* we just read a handshake message from the other side:
- * this means that we don't need to retransmit of the
- * buffered messages.
- * XDTLS: may be able clear out this
- * buffer a little sooner (i.e if an out-of-order
- * handshake message/record is received at the record
- * layer.
- * XDTLS: exception is that the server needs to
- * know that change cipher spec and finished messages
- * have been received by the client before clearing this
- * buffer. this can simply be done by waiting for the
- * first data segment, but is there a better way? */
- dtls1_clear_record_buffer(s);
+ /* Don't change sequence numbers while listening */
+ if (!s->d1->listen)
+ s->d1->handshake_read_seq++;
s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
return s->init_num;
static int
dtls1_retrieve_buffered_fragment(SSL *s, long max, int *ok)
{
- /* (0) check whether the desired fragment is available
+ /*-
+ * (0) check whether the desired fragment is available
* if so:
* (1) copy over the fragment to s->init_buf->data[]
* (2) update s->init_num
return 0;
}
+/* dtls1_max_handshake_message_len returns the maximum number of bytes
+ * permitted in a DTLS handshake message for |s|. The minimum is 16KB, but may
+ * be greater if the maximum certificate list size requires it. */
+static unsigned long dtls1_max_handshake_message_len(const SSL *s)
+ {
+ unsigned long max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
+ if (max_len < (unsigned long)s->max_cert_list)
+ return s->max_cert_list;
+ return max_len;
+ }
static int
-dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+dtls1_reassemble_fragment(SSL *s, const struct hm_header_st* msg_hdr, int *ok)
{
hm_fragment *frag = NULL;
pitem *item = NULL;
int i = -1, is_complete;
unsigned char seq64be[8];
- unsigned long frag_len = msg_hdr->frag_len, max_len;
+ unsigned long frag_len = msg_hdr->frag_len;
- if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
+ if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len ||
+ msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
goto err;
- /* Determine maximum allowed message size. Depends on (user set)
- * maximum certificate length, but 16k is minimum.
- */
- if (DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH < s->max_cert_list)
- max_len = s->max_cert_list;
- else
- max_len = DTLS1_HM_HEADER_LENGTH + SSL3_RT_MAX_ENCRYPTED_LENGTH;
-
- if ((msg_hdr->frag_off+frag_len) > max_len)
- goto err;
+ if (frag_len == 0)
+ return DTLS1_HM_FRAGMENT_RETRY;
/* Try to find item in queue */
memset(seq64be,0,sizeof(seq64be));
frag->msg_header.frag_off = 0;
}
else
+ {
frag = (hm_fragment*) item->data;
+ if (frag->msg_header.msg_len != msg_hdr->msg_len)
+ {
+ item = NULL;
+ frag = NULL;
+ goto err;
+ }
+ }
+
/* If message is already reassembled, this must be a
- * retransmit and can be dropped.
+ * retransmit and can be dropped. In this case item != NULL and so frag
+ * does not need to be freed.
*/
if (frag->reassembly == NULL)
{
/* read the body of the fragment (header has already been read */
i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
frag->fragment + msg_hdr->frag_off,frag_len,0);
- if (i<=0 || (unsigned long)i!=frag_len)
+ if ((unsigned long)i!=frag_len)
+ i=-1;
+ if (i<=0)
goto err;
- RSMBLY_BITMASK_MARK(frag->reassembly, msg_hdr->frag_off,
- msg_hdr->frag_off + frag_len);
+ RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
+ (long)(msg_hdr->frag_off + frag_len));
- RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, msg_hdr->msg_len,
- is_complete)
+ RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
+ is_complete);
if (is_complete)
{
if (item == NULL)
{
- memset(seq64be,0,sizeof(seq64be));
- seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
- seq64be[7] = (unsigned char)(msg_hdr->seq);
-
item = pitem_new(seq64be, frag);
if (item == NULL)
{
- goto err;
i = -1;
+ goto err;
}
- pqueue_insert(s->d1->buffered_messages, item);
+ item = pqueue_insert(s->d1->buffered_messages, item);
+ /* pqueue_insert fails iff a duplicate item is inserted.
+ * However, |item| cannot be a duplicate. If it were,
+ * |pqueue_find|, above, would have returned it and control
+ * would never have reached this branch. */
+ OPENSSL_assert(item != NULL);
}
return DTLS1_HM_FRAGMENT_RETRY;
err:
- if (frag != NULL) dtls1_hm_fragment_free(frag);
- if (item != NULL) OPENSSL_free(item);
+ if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
*ok = 0;
return i;
}
static int
-dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
+dtls1_process_out_of_seq_message(SSL *s, const struct hm_header_st* msg_hdr, int *ok)
{
int i=-1;
hm_fragment *frag = NULL;
/* If we already have an entry and this one is a fragment,
* don't discard it and rather try to reassemble it.
*/
- if (item != NULL && frag_len < msg_hdr->msg_len)
+ if (item != NULL && frag_len != msg_hdr->msg_len)
item = NULL;
/* Discard the message if sequence number was already there, is
}
else
{
- if (frag_len && frag_len < msg_hdr->msg_len)
+ if (frag_len != msg_hdr->msg_len)
return dtls1_reassemble_fragment(s, msg_hdr, ok);
+ if (frag_len > dtls1_max_handshake_message_len(s))
+ goto err;
+
frag = dtls1_hm_fragment_new(frag_len, 0);
if ( frag == NULL)
goto err;
/* read the body of the fragment (header has already been read */
i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
frag->fragment,frag_len,0);
- if (i<=0 || (unsigned long)i!=frag_len)
+ if ((unsigned long)i!=frag_len)
+ i = -1;
+ if (i<=0)
goto err;
}
- memset(seq64be,0,sizeof(seq64be));
- seq64be[6] = (unsigned char)(msg_hdr->seq>>8);
- seq64be[7] = (unsigned char)(msg_hdr->seq);
-
item = pitem_new(seq64be, frag);
if ( item == NULL)
goto err;
- pqueue_insert(s->d1->buffered_messages, item);
+ item = pqueue_insert(s->d1->buffered_messages, item);
+ /* pqueue_insert fails iff a duplicate item is inserted.
+ * However, |item| cannot be a duplicate. If it were,
+ * |pqueue_find|, above, would have returned it. Then, either
+ * |frag_len| != |msg_hdr->msg_len| in which case |item| is set
+ * to NULL and it will have been processed with
+ * |dtls1_reassemble_fragment|, above, or the record will have
+ * been discarded. */
+ OPENSSL_assert(item != NULL);
}
return DTLS1_HM_FRAGMENT_RETRY;
err:
- if ( frag != NULL) dtls1_hm_fragment_free(frag);
- if ( item != NULL) OPENSSL_free(item);
+ if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
*ok = 0;
return i;
}
int i,al;
struct hm_header_st msg_hdr;
+ redo:
/* see if we have the required fragment already */
if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
{
*ok = 0;
return i;
}
- OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH);
+ /* Handshake fails if message header is incomplete */
+ if (i != DTLS1_HM_HEADER_LENGTH)
+ {
+ al=SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
+ goto f_err;
+ }
/* parse the message fragment header */
dtls1_get_message_header(wire, &msg_hdr);
/*
* if this is a future (or stale) message it gets buffered
- * (or dropped)--no further processing at this time
+ * (or dropped)--no further processing at this time
+ * While listening, we accept seq 1 (ClientHello with cookie)
+ * although we're still expecting seq 0 (ClientHello)
*/
- if ( msg_hdr.seq != s->d1->handshake_read_seq)
+ if (msg_hdr.seq != s->d1->handshake_read_seq && !(s->d1->listen && msg_hdr.seq == 1))
return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
len = msg_hdr.msg_len;
s->msg_callback_arg);
s->init_num = 0;
- return dtls1_get_message_fragment(s, st1, stn,
- max, ok);
+ goto redo;
}
else /* Incorrectly formated Hello request */
{
/* XDTLS: an incorrectly formatted fragment should cause the
* handshake to fail */
- OPENSSL_assert(i == (int)frag_len);
+ if (i != (int)frag_len)
+ {
+ al=SSL3_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL3_AD_ILLEGAL_PARAMETER);
+ goto f_err;
+ }
*ok = 1;
return(-1);
}
-int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen)
- {
- unsigned char *p,*d;
- int i;
- unsigned long l;
-
- if (s->state == a)
- {
- d=(unsigned char *)s->init_buf->data;
- p= &(d[DTLS1_HM_HEADER_LENGTH]);
-
- i=s->method->ssl3_enc->final_finish_mac(s,
- sender,slen,s->s3->tmp.finish_md);
- s->s3->tmp.finish_md_len = i;
- memcpy(p, s->s3->tmp.finish_md, i);
- p+=i;
- l=i;
-
- /* Copy the finished so we can use it for
- * renegotiation checks
- */
- if(s->type == SSL_ST_CONNECT)
- {
- OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
- memcpy(s->s3->previous_client_finished,
- s->s3->tmp.finish_md, i);
- s->s3->previous_client_finished_len=i;
- }
- else
- {
- OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
- memcpy(s->s3->previous_server_finished,
- s->s3->tmp.finish_md, i);
- s->s3->previous_server_finished_len=i;
- }
-
-#ifdef OPENSSL_SYS_WIN16
- /* MSVC 1.5 does not clear the top bytes of the word unless
- * I do this.
- */
- l&=0xffff;
-#endif
-
- d = dtls1_set_message_header(s, d, SSL3_MT_FINISHED, l, 0, l);
- s->init_num=(int)l+DTLS1_HM_HEADER_LENGTH;
- s->init_off=0;
-
- /* buffer the message to handle re-xmits */
- dtls1_buffer_message(s, 0);
-
- s->state=b;
- }
-
- /* SSL3_ST_SEND_xxxxxx_HELLO_B */
- return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
- }
-
-/* for these 2 messages, we need to
+/*-
+ * for these 2 messages, we need to
* ssl->enc_read_ctx re-init
* ssl->s3->read_sequence zero
* ssl->s3->read_mac_secret re-init
return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
}
-static int dtls1_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
- {
- int n;
- unsigned char *p;
-
- n=i2d_X509(x,NULL);
- if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
- {
- SSLerr(SSL_F_DTLS1_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
- return 0;
- }
- p=(unsigned char *)&(buf->data[*l]);
- l2n3(n,p);
- i2d_X509(x,&p);
- *l+=n+3;
-
- return 1;
- }
-unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
- {
- unsigned char *p;
- int i;
- unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH;
- BUF_MEM *buf;
-
- /* TLSv1 sends a chain with nothing in it, instead of an alert */
- buf=s->init_buf;
- if (!BUF_MEM_grow_clean(buf,10))
- {
- SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
- return(0);
- }
- if (x != NULL)
- {
- X509_STORE_CTX xs_ctx;
-
- if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
- {
- SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
- return(0);
- }
-
- X509_verify_cert(&xs_ctx);
- /* Don't leave errors in the queue */
- ERR_clear_error();
- for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
- {
- x = sk_X509_value(xs_ctx.chain, i);
-
- if (!dtls1_add_cert_to_buf(buf, &l, x))
- {
- X509_STORE_CTX_cleanup(&xs_ctx);
- return 0;
- }
- }
- X509_STORE_CTX_cleanup(&xs_ctx);
- }
- /* Thawte special :-) */
- for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
- {
- x=sk_X509_value(s->ctx->extra_certs,i);
- if (!dtls1_add_cert_to_buf(buf, &l, x))
- return 0;
- }
-
- l-= (3 + DTLS1_HM_HEADER_LENGTH);
-
- p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
- l2n3(l,p);
- l+=3;
- p=(unsigned char *)&(buf->data[0]);
- p = dtls1_set_message_header(s, p, SSL3_MT_CERTIFICATE, l, 0, l);
-
- l+=DTLS1_HM_HEADER_LENGTH;
- return(l);
- }
-
int dtls1_read_failed(SSL *s, int code)
{
if ( code > 0)
return code;
}
- if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */
+#ifndef OPENSSL_NO_HEARTBEATS
+ /* done, no need to send a retransmit */
+ if (!SSL_in_init(s) && !s->tlsext_hb_pending)
+#else
+ /* done, no need to send a retransmit */
+ if (!SSL_in_init(s))
+#endif
{
BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
return code;
OPENSSL_assert(s->init_off == 0);
frag = dtls1_hm_fragment_new(s->init_num, 0);
+ if (!frag)
+ return 0;
memcpy(frag->fragment, s->init_buf->data, s->init_num);
if ( is_ccs)
{
OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
- ((s->version==DTLS1_VERSION)?DTLS1_CCS_HEADER_LENGTH:3) == (unsigned int)s->init_num);
+ DTLS1_CCS_HEADER_LENGTH == (unsigned int)s->init_num);
}
else
{
struct dtls1_retransmit_state saved_state;
unsigned char save_write_sequence[8];
- /*
+ /*-
OPENSSL_assert(s->init_num == 0);
OPENSSL_assert(s->init_off == 0);
*/
dtls1_set_message_header(SSL *s, unsigned char *p, unsigned char mt,
unsigned long len, unsigned long frag_off, unsigned long frag_len)
{
- if ( frag_off == 0)
+ /* Don't change sequence numbers while listening */
+ if (frag_off == 0 && !s->d1->listen)
{
s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
s->d1->next_handshake_write_seq++;
return p;
}
-static unsigned int
-dtls1_min_mtu(void)
+unsigned int
+dtls1_link_min_mtu(void)
{
return (g_probable_mtu[(sizeof(g_probable_mtu) /
sizeof(g_probable_mtu[0])) - 1]);
}
-static unsigned int
-dtls1_guess_mtu(unsigned int curr_mtu)
+unsigned int
+dtls1_min_mtu(SSL *s)
{
- unsigned int i;
-
- if ( curr_mtu == 0 )
- return g_probable_mtu[0] ;
-
- for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++)
- if ( curr_mtu > g_probable_mtu[i])
- return g_probable_mtu[i];
-
- return curr_mtu;
+ return dtls1_link_min_mtu()-BIO_dgram_get_mtu_overhead(SSL_get_wbio(s));
}
+
void
dtls1_get_message_header(unsigned char *data, struct hm_header_st *msg_hdr)
{
ccs_hdr->type = *(data++);
}
+
+int dtls1_shutdown(SSL *s)
+ {
+ int ret;
+#ifndef OPENSSL_NO_SCTP
+ if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
+ !(s->shutdown & SSL_SENT_SHUTDOWN))
+ {
+ ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
+ if (ret < 0) return -1;
+
+ if (ret == 0)
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 1, NULL);
+ }
+#endif
+ ret = ssl3_shutdown(s);
+#ifndef OPENSSL_NO_SCTP
+ BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN, 0, NULL);
+#endif
+ return ret;
+ }
+
+#ifndef OPENSSL_NO_HEARTBEATS
+int
+dtls1_process_heartbeat(SSL *s)
+ {
+ unsigned char *p = &s->s3->rrec.data[0], *pl;
+ unsigned short hbtype;
+ unsigned int payload;
+ unsigned int padding = 16; /* Use minimum padding */
+
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
+ &s->s3->rrec.data[0], s->s3->rrec.length,
+ s, s->msg_callback_arg);
+
+ /* Read type and payload length first */
+ if (1 + 2 + 16 > s->s3->rrec.length)
+ return 0; /* silently discard */
+ if (s->s3->rrec.length > SSL3_RT_MAX_PLAIN_LENGTH)
+ return 0; /* silently discard per RFC 6520 sec. 4 */
+
+ hbtype = *p++;
+ n2s(p, payload);
+ if (1 + 2 + payload + 16 > s->s3->rrec.length)
+ return 0; /* silently discard per RFC 6520 sec. 4 */
+ pl = p;
+
+ if (hbtype == TLS1_HB_REQUEST)
+ {
+ unsigned char *buffer, *bp;
+ unsigned int write_length = 1 /* heartbeat type */ +
+ 2 /* heartbeat length */ +
+ payload + padding;
+ int r;
+
+ if (write_length > SSL3_RT_MAX_PLAIN_LENGTH)
+ return 0;
+
+ /* Allocate memory for the response, size is 1 byte
+ * message type, plus 2 bytes payload length, plus
+ * payload, plus padding
+ */
+ buffer = OPENSSL_malloc(write_length);
+ if (buffer == NULL)
+ return -1;
+ bp = buffer;
+
+ /* Enter response type, length and copy payload */
+ *bp++ = TLS1_HB_RESPONSE;
+ s2n(payload, bp);
+ memcpy(bp, pl, payload);
+ bp += payload;
+ /* Random padding */
+ RAND_pseudo_bytes(bp, padding);
+
+ r = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, write_length);
+
+ if (r >= 0 && s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buffer, write_length,
+ s, s->msg_callback_arg);
+
+ OPENSSL_free(buffer);
+
+ if (r < 0)
+ return r;
+ }
+ else if (hbtype == TLS1_HB_RESPONSE)
+ {
+ unsigned int seq;
+
+ /* We only send sequence numbers (2 bytes unsigned int),
+ * and 16 random bytes, so we just try to read the
+ * sequence number */
+ n2s(pl, seq);
+
+ if (payload == 18 && seq == s->tlsext_hb_seq)
+ {
+ dtls1_stop_timer(s);
+ s->tlsext_hb_seq++;
+ s->tlsext_hb_pending = 0;
+ }
+ }
+
+ return 0;
+ }
+
+int
+dtls1_heartbeat(SSL *s)
+ {
+ unsigned char *buf, *p;
+ int ret;
+ unsigned int payload = 18; /* Sequence number + random bytes */
+ unsigned int padding = 16; /* Use minimum padding */
+
+ /* Only send if peer supports and accepts HB requests... */
+ if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
+ s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
+ {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
+ return -1;
+ }
+
+ /* ...and there is none in flight yet... */
+ if (s->tlsext_hb_pending)
+ {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
+ return -1;
+ }
+
+ /* ...and no handshake in progress. */
+ if (SSL_in_init(s) || s->in_handshake)
+ {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
+ return -1;
+ }
+
+ /* Check if padding is too long, payload and padding
+ * must not exceed 2^14 - 3 = 16381 bytes in total.
+ */
+ OPENSSL_assert(payload + padding <= 16381);
+
+ /*-
+ * Create HeartBeat message, we just use a sequence number
+ * as payload to distuingish different messages and add
+ * some random stuff.
+ * - Message Type, 1 byte
+ * - Payload Length, 2 bytes (unsigned int)
+ * - Payload, the sequence number (2 bytes uint)
+ * - Payload, random bytes (16 bytes uint)
+ * - Padding
+ */
+ buf = OPENSSL_malloc(1 + 2 + payload + padding);
+ if (buf == NULL)
+ {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_MALLOC_FAILURE);
+ return -1;
+ }
+ p = buf;
+ /* Message Type */
+ *p++ = TLS1_HB_REQUEST;
+ /* Payload length (18 bytes here) */
+ s2n(payload, p);
+ /* Sequence number */
+ s2n(s->tlsext_hb_seq, p);
+ /* 16 random bytes */
+ RAND_pseudo_bytes(p, 16);
+ p += 16;
+ /* Random padding */
+ RAND_pseudo_bytes(p, padding);
+
+ ret = dtls1_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
+ if (ret >= 0)
+ {
+ if (s->msg_callback)
+ s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
+ buf, 3 + payload + padding,
+ s, s->msg_callback_arg);
+
+ dtls1_start_timer(s);
+ s->tlsext_hb_pending = 1;
+ }
+
+ OPENSSL_free(buf);
+
+ return ret;
+ }
+#endif
projects / openssl.git / blobdiff