/* ssl/d1_both.c */
-/*
+/*
* DTLS implementation written by Nagendra Modadugu
- * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
+ * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
*/
/* ====================================================================
* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 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
* 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:
* 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
+ * 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
* 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
#include <openssl/evp.h>
#include <openssl/x509.h>
+#define RSMBLY_BITMASK_SIZE(msg_len) (((msg_len) + 7) / 8)
+
+#define RSMBLY_BITMASK_MARK(bitmask, start, end) { \
+ if ((end) - (start) <= 8) { \
+ long ii; \
+ for (ii = (start); ii < (end); ii++) bitmask[((ii) >> 3)] |= (1 << ((ii) & 7)); \
+ } else { \
+ long ii; \
+ bitmask[((start) >> 3)] |= bitmask_start_values[((start) & 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) { \
+ long ii; \
+ OPENSSL_assert((msg_len) > 0); \
+ is_complete = 1; \
+ 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; } }
+
+static unsigned char bitmask_start_values[] =
+ { 0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80 };
+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 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,
- unsigned char *p);
-static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
- unsigned long len, unsigned short seq_num, unsigned long frag_off,
- unsigned long frag_len);
-static int dtls1_retransmit_buffered_messages(SSL *s);
-static long dtls1_get_message_fragment(SSL *s, int st1, int stn,
- long max, int *ok);
-
-static hm_fragment *
-dtls1_hm_fragment_new(unsigned long frag_len)
- {
- hm_fragment *frag = NULL;
- unsigned char *buf = NULL;
-
- frag = (hm_fragment *)OPENSSL_malloc(sizeof(hm_fragment));
- if ( frag == NULL)
- return NULL;
-
- if (frag_len)
- {
- buf = (unsigned char *)OPENSSL_malloc(frag_len);
- if ( buf == NULL)
- {
- OPENSSL_free(frag);
- return NULL;
- }
- }
-
- /* zero length fragment gets zero frag->fragment */
- frag->fragment = buf;
-
- return frag;
- }
+static const unsigned int g_probable_mtu[] = { 1500, 512, 256 };
-static void
-dtls1_hm_fragment_free(hm_fragment *frag)
- {
- if (frag->fragment) OPENSSL_free(frag->fragment);
- OPENSSL_free(frag);
- }
-
-/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
+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, unsigned char *p);
+static void dtls1_set_message_header_int(SSL *s, unsigned char mt,
+ unsigned long len,
+ unsigned short seq_num,
+ unsigned long frag_off,
+ unsigned long frag_len);
+static long dtls1_get_message_fragment(SSL *s, int st1, int stn, int mt,
+ int *ok);
+static int dtls_get_reassembled_message(SSL *s, long *len);
+
+static hm_fragment *dtls1_hm_fragment_new(unsigned long frag_len,
+ int reassembly)
+{
+ hm_fragment *frag = NULL;
+ unsigned char *buf = NULL;
+ unsigned char *bitmask = NULL;
+
+ frag = OPENSSL_malloc(sizeof(*frag));
+ if (frag == NULL)
+ return NULL;
+
+ if (frag_len) {
+ buf = OPENSSL_malloc(frag_len);
+ if (buf == NULL) {
+ OPENSSL_free(frag);
+ return NULL;
+ }
+ }
+
+ /* zero length fragment gets zero frag->fragment */
+ frag->fragment = buf;
+
+ /* Initialize reassembly bitmask if necessary */
+ if (reassembly) {
+ bitmask = OPENSSL_zalloc(RSMBLY_BITMASK_SIZE(frag_len));
+ if (bitmask == NULL) {
+ OPENSSL_free(buf);
+ OPENSSL_free(frag);
+ return NULL;
+ }
+ }
+
+ frag->reassembly = bitmask;
+
+ return frag;
+}
+
+void dtls1_hm_fragment_free(hm_fragment *frag)
+{
+ if (!frag)
+ return;
+ 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);
+ }
+ OPENSSL_free(frag->fragment);
+ OPENSSL_free(frag->reassembly);
+ OPENSSL_free(frag);
+}
+
+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 (s->d1->mtu < dtls1_min_mtu(s)) {
+ if (!(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
+ 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;
+ }
+ return 1;
+}
+
+/*
+ * 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;
-
- /* AHA! Figure out the MTU, and stick to the right size */
- if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU))
- {
- 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->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);
- }
- }
-#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;
-
- 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);
- }
-
- OPENSSL_assert(mtu > 0); /* should have something reasonable now */
-
-#endif
-
- 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);
-
- frag_off = 0;
- while( s->init_num)
- {
- curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) -
- DTLS1_RT_HEADER_LENGTH;
-
- if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH)
- {
- /* grr.. we could get an error if MTU picked was wrong */
- ret = BIO_flush(SSL_get_wbio(s));
- if ( ret <= 0)
- return ret;
- curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH;
- }
-
- if ( s->init_num > curr_mtu)
- len = curr_mtu;
- else
- len = s->init_num;
-
-
- /* XDTLS: this function is too long. split out the CCS part */
- if ( type == SSL3_RT_HANDSHAKE)
- {
- if ( s->init_off != 0)
- {
- OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
- 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;
- }
-
- 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],
- len);
- if (ret < 0)
- {
- /* might need to update MTU here, but we don't know
- * which previous packet caused the failure -- so can't
- * really retransmit anything. continue as if everything
- * is fine and wait for an alert to handle the
- * retransmit
- */
- if ( BIO_ctrl(SSL_get_wbio(s),
- BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL))
- s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
- BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL);
- else
- return(-1);
- }
- else
- {
-
- /* bad if this assert fails, only part of the handshake
- * message got sent. but why would this happen? */
- OPENSSL_assert(len == (unsigned int)ret);
-
- if (type == SSL3_RT_HANDSHAKE && ! s->d1->retransmitting)
- {
- /* should not be done for 'Hello Request's, but in that case
- * we'll ignore the result anyway */
- unsigned char *p = &s->init_buf->data[s->init_off];
- const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
- int len;
-
- if (frag_off == 0)
- {
- /* reconstruct message header is if it
- * is being sent in single fragment */
- *p++ = msg_hdr->type;
- l2n3(msg_hdr->msg_len,p);
- s2n (msg_hdr->seq,p);
- l2n3(0,p);
- l2n3(msg_hdr->msg_len,p);
- p -= DTLS1_HM_HEADER_LENGTH;
- len = ret;
- }
- else
- {
- p += DTLS1_HM_HEADER_LENGTH;
- len = ret - DTLS1_HM_HEADER_LENGTH;
- }
-
- ssl3_finish_mac(s, p, len);
- }
-
- if (ret == s->init_num)
- {
- if (s->msg_callback)
- s->msg_callback(1, s->version, type, s->init_buf->data,
- (size_t)(s->init_off + s->init_num), s,
- s->msg_callback_arg);
-
- s->init_off = 0; /* done writing this message */
- s->init_num = 0;
-
- return(1);
- }
- s->init_off+=ret;
- s->init_num-=ret;
- frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
- }
- }
- return(0);
- }
-
-
-/* Obtain handshake message of message type 'mt' (any if mt == -1),
- * maximum acceptable body length 'max'.
- * Read an entire handshake message. Handshake messages arrive in
- * fragments.
+{
+ int ret;
+ unsigned int curr_mtu;
+ int retry = 1;
+ unsigned int len, frag_off, mac_size, blocksize, used_len;
+
+ if (!dtls1_query_mtu(s))
+ return -1;
+
+ 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) {
+ if (s->enc_write_ctx
+ && ((EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_GCM_MODE) ||
+ (EVP_CIPHER_CTX_mode(s->enc_write_ctx) == EVP_CIPH_CCM_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_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;
+ /* s->init_num shouldn't ever be < 0...but just in case */
+ while (s->init_num > 0) {
+ 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) {
+ /*
+ * grr.. we could get an error if MTU picked was wrong
+ */
+ ret = BIO_flush(SSL_get_wbio(s));
+ if (ret <= 0)
+ return ret;
+ 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;
+ }
+ }
+
+ /*
+ * 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) {
+ if (s->init_off != 0) {
+ OPENSSL_assert(s->init_off > DTLS1_HM_HEADER_LENGTH);
+ s->init_off -= DTLS1_HM_HEADER_LENGTH;
+ s->init_num += 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]);
+ }
+
+ ret = dtls1_write_bytes(s, type, &s->init_buf->data[s->init_off],
+ len);
+ if (ret < 0) {
+ /*
+ * might need to update MTU here, but we don't know which
+ * previous packet caused the failure -- so can't really
+ * retransmit anything. continue as if everything is fine and
+ * wait for an alert to handle the retransmit
+ */
+ if (retry && BIO_ctrl(SSL_get_wbio(s),
+ BIO_CTRL_DGRAM_MTU_EXCEEDED, 0, NULL) > 0) {
+ 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 {
+
+ /*
+ * bad if this assert fails, only part of the handshake message
+ * got sent. but why would this happen?
+ */
+ OPENSSL_assert(len == (unsigned int)ret);
+
+ if (type == SSL3_RT_HANDSHAKE && !s->d1->retransmitting) {
+ /*
+ * should not be done for 'Hello Request's, but in that case
+ * we'll ignore the result anyway
+ */
+ unsigned char *p =
+ (unsigned char *)&s->init_buf->data[s->init_off];
+ const struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
+ int xlen;
+
+ if (frag_off == 0 && s->version != DTLS1_BAD_VER) {
+ /*
+ * reconstruct message header is if it is being sent in
+ * single fragment
+ */
+ *p++ = msg_hdr->type;
+ l2n3(msg_hdr->msg_len, p);
+ s2n(msg_hdr->seq, p);
+ l2n3(0, p);
+ l2n3(msg_hdr->msg_len, p);
+ p -= DTLS1_HM_HEADER_LENGTH;
+ xlen = ret;
+ } else {
+ p += DTLS1_HM_HEADER_LENGTH;
+ xlen = ret - DTLS1_HM_HEADER_LENGTH;
+ }
+
+ ssl3_finish_mac(s, p, xlen);
+ }
+
+ if (ret == s->init_num) {
+ if (s->msg_callback)
+ s->msg_callback(1, s->version, type, s->init_buf->data,
+ (size_t)(s->init_off + s->init_num), s,
+ s->msg_callback_arg);
+
+ s->init_off = 0; /* done writing this message */
+ s->init_num = 0;
+
+ return (1);
+ }
+ s->init_off += ret;
+ s->init_num -= ret;
+ frag_off += (ret -= DTLS1_HM_HEADER_LENGTH);
+ }
+ }
+ return (0);
+}
+
+/*
+ * Obtain handshake message of message type 'mt' (any if mt == -1), maximum
+ * acceptable body length 'max'. Read an entire handshake message. Handshake
+ * messages arrive in fragments.
*/
long dtls1_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
- {
- int i, al;
- struct hm_header_st *msg_hdr;
-
- /* s3->tmp is used to store messages that are unexpected, caused
- * by the absence of an optional handshake message */
- if (s->s3->tmp.reuse_message)
- {
- s->s3->tmp.reuse_message=0;
- if ((mt >= 0) && (s->s3->tmp.message_type != mt))
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_DTLS1_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
- goto f_err;
- }
- *ok=1;
- s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
- s->init_num = (int)s->s3->tmp.message_size;
- return s->init_num;
- }
-
- msg_hdr = &s->d1->r_msg_hdr;
- do
- {
- if ( msg_hdr->frag_off == 0)
- {
- /* s->d1->r_message_header.msg_len = 0; */
- memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
- }
-
- i = dtls1_get_message_fragment(s, st1, stn, max, ok);
- if ( i == DTLS1_HM_BAD_FRAGMENT ||
- i == DTLS1_HM_FRAGMENT_RETRY) /* bad fragment received */
- continue;
- else if ( i <= 0 && !*ok)
- return i;
-
- /* Note that s->init_sum is used as a counter summing
- * up fragments' lengths: as soon as they sum up to
- * handshake packet length, we assume we have got all
- * the fragments. Overlapping fragments would cause
- * premature termination, so we don't expect overlaps.
- * Well, handling overlaps would require something more
- * drastic. Indeed, as it is now there is no way to
- * tell if out-of-order fragment from the middle was
- * the last. '>=' is the best/least we can do to control
- * the potential damage caused by malformed overlaps. */
- if ((unsigned int)s->init_num >= msg_hdr->msg_len)
- {
- unsigned char *p = s->init_buf->data;
- unsigned long msg_len = msg_hdr->msg_len;
-
- /* reconstruct message header as if it was
- * sent in single fragment */
- *(p++) = msg_hdr->type;
- l2n3(msg_len,p);
- s2n (msg_hdr->seq,p);
- l2n3(0,p);
- l2n3(msg_len,p);
- p -= DTLS1_HM_HEADER_LENGTH;
- msg_len += DTLS1_HM_HEADER_LENGTH;
-
- ssl3_finish_mac(s, p, msg_len);
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
- p, msg_len,
- s, s->msg_callback_arg);
-
- 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);
-
- s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
- return s->init_num;
- }
- else
- msg_hdr->frag_off = i;
- } while(1) ;
-
-f_err:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
- *ok = 0;
- return -1;
- }
-
-
-static int dtls1_preprocess_fragment(SSL *s,struct hm_header_st *msg_hdr,int max)
- {
- size_t frag_off,frag_len,msg_len;
-
- msg_len = msg_hdr->msg_len;
- frag_off = msg_hdr->frag_off;
- frag_len = msg_hdr->frag_len;
-
- /* sanity checking */
- if ( (frag_off+frag_len) > msg_len)
- {
- SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
- return SSL_AD_ILLEGAL_PARAMETER;
- }
-
- if ( (frag_off+frag_len) > (unsigned long)max)
- {
- SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
- return SSL_AD_ILLEGAL_PARAMETER;
- }
-
- if ( s->d1->r_msg_hdr.frag_off == 0) /* first fragment */
- {
- /* msg_len is limited to 2^24, but is effectively checked
- * against max above */
- if (!BUF_MEM_grow_clean(s->init_buf,msg_len+DTLS1_HM_HEADER_LENGTH))
- {
- SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,ERR_R_BUF_LIB);
- return SSL_AD_INTERNAL_ERROR;
- }
-
- s->s3->tmp.message_size = msg_len;
- s->d1->r_msg_hdr.msg_len = msg_len;
- s->s3->tmp.message_type = msg_hdr->type;
- s->d1->r_msg_hdr.type = msg_hdr->type;
- s->d1->r_msg_hdr.seq = msg_hdr->seq;
- }
- else if (msg_len != s->d1->r_msg_hdr.msg_len)
- {
- /* They must be playing with us! BTW, failure to enforce
- * upper limit would open possibility for buffer overrun. */
- SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT,SSL_R_EXCESSIVE_MESSAGE_SIZE);
- return SSL_AD_ILLEGAL_PARAMETER;
- }
-
- return 0; /* no error */
- }
-
+{
+ int i, al;
+ struct hm_header_st *msg_hdr;
+ unsigned char *p;
+ unsigned long msg_len;
+
+ /*
+ * s3->tmp is used to store messages that are unexpected, caused by the
+ * absence of an optional handshake message
+ */
+ if (s->s3->tmp.reuse_message) {
+ if ((mt >= 0) && (s->s3->tmp.message_type != mt)) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
+ goto f_err;
+ }
+ *ok = 1;
+
+
+ /*
+ * Messages reused from dtls1_listen also have the record header in
+ * the buffer which we need to skip over.
+ */
+ if (s->s3->tmp.reuse_message == DTLS1_SKIP_RECORD_HEADER) {
+ s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH
+ + DTLS1_RT_HEADER_LENGTH;
+ } else {
+ s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+ }
+ s->init_num = (int)s->s3->tmp.message_size;
+ s->s3->tmp.reuse_message = 0;
+ return s->init_num;
+ }
+
+ msg_hdr = &s->d1->r_msg_hdr;
+ memset(msg_hdr, 0, sizeof(*msg_hdr));
+
+ again:
+ i = dtls1_get_message_fragment(s, st1, stn, mt, ok);
+ if (i == DTLS1_HM_BAD_FRAGMENT || i == DTLS1_HM_FRAGMENT_RETRY) {
+ /* bad fragment received */
+ goto again;
+ } else if (i <= 0 && !*ok) {
+ return i;
+ }
+
+ if (mt >= 0 && s->s3->tmp.message_type != mt) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
+ goto f_err;
+ }
+
+ p = (unsigned char *)s->init_buf->data;
+
+ if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
+ if (s->msg_callback) {
+ s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
+ p, 1, s, s->msg_callback_arg);
+ }
+ /*
+ * This isn't a real handshake message so skip the processing below.
+ * dtls1_get_message_fragment() will never return a CCS if mt == -1,
+ * so we are ok to continue in that case.
+ */
+ return i;
+ }
+
+ msg_len = msg_hdr->msg_len;
+
+ /* reconstruct message header */
+ *(p++) = msg_hdr->type;
+ l2n3(msg_len, p);
+ s2n(msg_hdr->seq, p);
+ l2n3(0, p);
+ l2n3(msg_len, p);
+ if (s->version != DTLS1_BAD_VER) {
+ p -= DTLS1_HM_HEADER_LENGTH;
+ msg_len += DTLS1_HM_HEADER_LENGTH;
+ }
+
+ if (msg_len > (unsigned long)max) {
+ al = SSL_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_DTLS1_GET_MESSAGE, SSL_R_EXCESSIVE_MESSAGE_SIZE);
+ goto f_err;
+ }
+
+ ssl3_finish_mac(s, p, msg_len);
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
+ p, msg_len, s, s->msg_callback_arg);
+
+ memset(msg_hdr, 0, sizeof(*msg_hdr));
+
+ s->d1->handshake_read_seq++;
+
+
+ s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+ return s->init_num;
+
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ *ok = 0;
+ return -1;
+}
+
+int dtls_get_message(SSL *s, int *mt, unsigned long *len)
+{
+ struct hm_header_st *msg_hdr;
+ unsigned char *p;
+ unsigned long msg_len;
+ int ok;
+ long tmplen;
+
+ msg_hdr = &s->d1->r_msg_hdr;
+ memset(msg_hdr, 0, sizeof(*msg_hdr));
+
+ again:
+ ok = dtls_get_reassembled_message(s, &tmplen);
+ if (tmplen == DTLS1_HM_BAD_FRAGMENT
+ || tmplen == DTLS1_HM_FRAGMENT_RETRY) {
+ /* bad fragment received */
+ goto again;
+ } else if (tmplen <= 0 && !ok) {
+ return 0;
+ }
+
+ *mt = s->s3->tmp.message_type;
+
+ p = (unsigned char *)s->init_buf->data;
+
+ if (*mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
+ if (s->msg_callback) {
+ s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
+ p, 1, s, s->msg_callback_arg);
+ }
+ /*
+ * This isn't a real handshake message so skip the processing below.
+ */
+ return 1;
+ }
+
+ msg_len = msg_hdr->msg_len;
+
+ /* reconstruct message header */
+ *(p++) = msg_hdr->type;
+ l2n3(msg_len, p);
+ s2n(msg_hdr->seq, p);
+ l2n3(0, p);
+ l2n3(msg_len, p);
+ if (s->version != DTLS1_BAD_VER) {
+ p -= DTLS1_HM_HEADER_LENGTH;
+ msg_len += DTLS1_HM_HEADER_LENGTH;
+ }
+
+ ssl3_finish_mac(s, p, msg_len);
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
+ p, msg_len, s, s->msg_callback_arg);
+
+ memset(msg_hdr, 0, sizeof(*msg_hdr));
+
+ s->d1->handshake_read_seq++;
+
+
+ s->init_msg = s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+ *len = s->init_num;
+
+ return 1;
+}
+
+static int dtls1_preprocess_fragment(SSL *s, struct hm_header_st *msg_hdr)
+{
+ size_t frag_off, frag_len, msg_len;
+
+ msg_len = msg_hdr->msg_len;
+ frag_off = msg_hdr->frag_off;
+ frag_len = msg_hdr->frag_len;
+
+ /* sanity checking */
+ if ((frag_off + frag_len) > msg_len) {
+ SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE);
+ return SSL_AD_ILLEGAL_PARAMETER;
+ }
+
+ if (s->d1->r_msg_hdr.frag_off == 0) { /* first fragment */
+ /*
+ * msg_len is limited to 2^24, but is effectively checked against max
+ * above
+ */
+ if (!BUF_MEM_grow_clean
+ (s->init_buf, msg_len + DTLS1_HM_HEADER_LENGTH)) {
+ SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, ERR_R_BUF_LIB);
+ return SSL_AD_INTERNAL_ERROR;
+ }
+
+ s->s3->tmp.message_size = msg_len;
+ s->d1->r_msg_hdr.msg_len = msg_len;
+ s->s3->tmp.message_type = msg_hdr->type;
+ s->d1->r_msg_hdr.type = msg_hdr->type;
+ s->d1->r_msg_hdr.seq = msg_hdr->seq;
+ } else if (msg_len != s->d1->r_msg_hdr.msg_len) {
+ /*
+ * They must be playing with us! BTW, failure to enforce upper limit
+ * would open possibility for buffer overrun.
+ */
+ SSLerr(SSL_F_DTLS1_PREPROCESS_FRAGMENT, SSL_R_EXCESSIVE_MESSAGE_SIZE);
+ return SSL_AD_ILLEGAL_PARAMETER;
+ }
+
+ return 0; /* no error */
+}
+
+static int dtls1_retrieve_buffered_fragment(SSL *s, int *ok)
+{
+ /*-
+ * (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
+ */
+ pitem *item;
+ hm_fragment *frag;
+ int al;
+
+ *ok = 0;
+ item = pqueue_peek(s->d1->buffered_messages);
+ if (item == NULL)
+ return 0;
+
+ frag = (hm_fragment *)item->data;
+
+ /* Don't return if reassembly still in progress */
+ if (frag->reassembly != NULL)
+ return 0;
+
+ if (s->d1->handshake_read_seq == frag->msg_header.seq) {
+ unsigned long frag_len = frag->msg_header.frag_len;
+ pqueue_pop(s->d1->buffered_messages);
+
+ al = dtls1_preprocess_fragment(s, &frag->msg_header);
+
+ if (al == 0) { /* no alert */
+ unsigned char *p =
+ (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+ memcpy(&p[frag->msg_header.frag_off], frag->fragment,
+ frag->msg_header.frag_len);
+ }
+
+ dtls1_hm_fragment_free(frag);
+ pitem_free(item);
+
+ if (al == 0) {
+ *ok = 1;
+ return frag_len;
+ }
+
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ s->init_num = 0;
+ *ok = 0;
+ return -1;
+ } else
+ 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_retrieve_buffered_fragment(SSL *s, long max, int *ok)
- {
- /* (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
- */
- pitem *item;
- hm_fragment *frag;
- int al;
-
- *ok = 0;
- item = pqueue_peek(s->d1->buffered_messages);
- if ( item == NULL)
- return 0;
-
- frag = (hm_fragment *)item->data;
-
- if ( s->d1->handshake_read_seq == frag->msg_header.seq)
- {
- pqueue_pop(s->d1->buffered_messages);
-
- al=dtls1_preprocess_fragment(s,&frag->msg_header,max);
-
- if (al==0) /* no alert */
- {
- unsigned char *p = s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
- memcpy(&p[frag->msg_header.frag_off],
- frag->fragment,frag->msg_header.frag_len);
- }
-
- dtls1_hm_fragment_free(frag);
- pitem_free(item);
-
- if (al==0)
- {
- *ok = 1;
- return frag->msg_header.frag_len;
- }
-
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
- s->init_num = 0;
- *ok = 0;
- return -1;
- }
- else
- return 0;
- }
-
+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;
+
+ if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len ||
+ msg_hdr->msg_len > dtls1_max_handshake_message_len(s))
+ goto err;
+
+ if (frag_len == 0)
+ return DTLS1_HM_FRAGMENT_RETRY;
+
+ /* Try to find item in queue */
+ memset(seq64be, 0, sizeof(seq64be));
+ seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
+ seq64be[7] = (unsigned char)msg_hdr->seq;
+ item = pqueue_find(s->d1->buffered_messages, seq64be);
+
+ if (item == NULL) {
+ frag = dtls1_hm_fragment_new(msg_hdr->msg_len, 1);
+ if (frag == NULL)
+ goto err;
+ memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
+ frag->msg_header.frag_len = frag->msg_header.msg_len;
+ 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. In this case item != NULL and so frag does not need to be
+ * freed.
+ */
+ if (frag->reassembly == NULL) {
+ unsigned char devnull[256];
+
+ while (frag_len) {
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,
+ devnull,
+ frag_len >
+ sizeof(devnull) ? sizeof(devnull) :
+ frag_len, 0);
+ if (i <= 0)
+ goto err;
+ frag_len -= i;
+ }
+ return DTLS1_HM_FRAGMENT_RETRY;
+ }
+
+ /* read the body of the fragment (header has already been read */
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,
+ frag->fragment + msg_hdr->frag_off,
+ frag_len, 0);
+ if ((unsigned long)i != frag_len)
+ i = -1;
+ if (i <= 0)
+ goto err;
+
+ RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,
+ (long)(msg_hdr->frag_off + frag_len));
+
+ RSMBLY_BITMASK_IS_COMPLETE(frag->reassembly, (long)msg_hdr->msg_len,
+ is_complete);
+
+ if (is_complete) {
+ OPENSSL_free(frag->reassembly);
+ frag->reassembly = NULL;
+ }
+
+ if (item == NULL) {
+ item = pitem_new(seq64be, frag);
+ if (item == NULL) {
+ i = -1;
+ goto err;
+ }
+
+ 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 (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;
- pitem *item = NULL;
- unsigned char seq64be[8];
- unsigned long frag_len = msg_hdr->frag_len;
-
- if ((msg_hdr->frag_off+frag_len) > msg_hdr->msg_len)
- goto err;
-
- if (msg_hdr->seq <= s->d1->handshake_read_seq)
- {
- unsigned char devnull [256];
-
- while (frag_len)
- {
- i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
- devnull,
- frag_len>sizeof(devnull)?sizeof(devnull):frag_len,0);
- if (i<=0) goto err;
- frag_len -= i;
- }
- }
-
- frag = dtls1_hm_fragment_new(frag_len);
- if ( frag == NULL)
- goto err;
-
- memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
-
- if (frag_len)
- {
- /* 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)
- 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);
- return DTLS1_HM_FRAGMENT_RETRY;
-
-err:
- if ( frag != NULL) dtls1_hm_fragment_free(frag);
- if ( item != NULL) OPENSSL_free(item);
- *ok = 0;
- return i;
- }
-
+ int i = -1;
+ hm_fragment *frag = NULL;
+ pitem *item = NULL;
+ unsigned char seq64be[8];
+ unsigned long frag_len = msg_hdr->frag_len;
+
+ if ((msg_hdr->frag_off + frag_len) > msg_hdr->msg_len)
+ goto err;
+
+ /* Try to find item in queue, to prevent duplicate entries */
+ memset(seq64be, 0, sizeof(seq64be));
+ seq64be[6] = (unsigned char)(msg_hdr->seq >> 8);
+ seq64be[7] = (unsigned char)msg_hdr->seq;
+ item = pqueue_find(s->d1->buffered_messages, seq64be);
+
+ /*
+ * 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)
+ item = NULL;
+
+ /*
+ * Discard the message if sequence number was already there, is too far
+ * in the future, already in the queue or if we received a FINISHED
+ * before the SERVER_HELLO, which then must be a stale retransmit.
+ */
+ if (msg_hdr->seq <= s->d1->handshake_read_seq ||
+ msg_hdr->seq > s->d1->handshake_read_seq + 10 || item != NULL ||
+ (s->d1->handshake_read_seq == 0 && msg_hdr->type == SSL3_MT_FINISHED))
+ {
+ unsigned char devnull[256];
+
+ while (frag_len) {
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,
+ devnull,
+ frag_len >
+ sizeof(devnull) ? sizeof(devnull) :
+ frag_len, 0);
+ if (i <= 0)
+ goto err;
+ frag_len -= i;
+ }
+ } else {
+ 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;
+
+ memcpy(&(frag->msg_header), msg_hdr, sizeof(*msg_hdr));
+
+ if (frag_len) {
+ /*
+ * read the body of the fragment (header has already been read
+ */
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,
+ frag->fragment, frag_len, 0);
+ if ((unsigned long)i != frag_len)
+ i = -1;
+ if (i <= 0)
+ goto err;
+ }
+
+ item = pitem_new(seq64be, frag);
+ if (item == NULL)
+ goto err;
+
+ 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 (item == NULL)
+ dtls1_hm_fragment_free(frag);
+ *ok = 0;
+ return i;
+}
static long
-dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
- {
- unsigned char wire[DTLS1_HM_HEADER_LENGTH];
- unsigned long l, frag_off, frag_len;
- int i,al;
- struct hm_header_st msg_hdr;
-
- /* see if we have the required fragment already */
- if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
- {
- if (*ok) s->init_num += frag_len;
- return frag_len;
- }
-
- /* read handshake message header */
- i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,wire,
- DTLS1_HM_HEADER_LENGTH, 0);
- if (i <= 0) /* nbio, or an error */
- {
- s->rwstate=SSL_READING;
- *ok = 0;
- return i;
- }
- OPENSSL_assert(i == DTLS1_HM_HEADER_LENGTH);
-
- /* 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
- */
- if ( msg_hdr.seq != s->d1->handshake_read_seq)
- return dtls1_process_out_of_seq_message(s, &msg_hdr, ok);
-
- l = msg_hdr.msg_len;
- frag_off = msg_hdr.frag_off;
- frag_len = msg_hdr.frag_len;
-
- if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
- wire[0] == SSL3_MT_HELLO_REQUEST)
- {
- /* The server may always send 'Hello Request' messages --
- * we are doing a handshake anyway now, so ignore them
- * if their format is correct. Does not count for
- * 'Finished' MAC. */
- if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0)
- {
- if (s->msg_callback)
- s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
- wire, DTLS1_HM_HEADER_LENGTH, s,
- s->msg_callback_arg);
-
- s->init_num = 0;
- return dtls1_get_message_fragment(s, st1, stn,
- max, ok);
- }
- else /* Incorrectly formated Hello request */
- {
- al=SSL_AD_UNEXPECTED_MESSAGE;
- SSLerr(SSL_F_DTLS1_GET_MESSAGE_FRAGMENT,SSL_R_UNEXPECTED_MESSAGE);
- goto f_err;
- }
- }
-
- if ((al=dtls1_preprocess_fragment(s,&msg_hdr,max)))
- goto f_err;
-
- /* XDTLS: ressurect this when restart is in place */
- s->state=stn;
-
- if ( frag_len > 0)
- {
- unsigned char *p=s->init_buf->data+DTLS1_HM_HEADER_LENGTH;
-
- i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
- &p[frag_off],frag_len,0);
- /* XDTLS: fix this--message fragments cannot span multiple packets */
- if (i <= 0)
- {
- s->rwstate=SSL_READING;
- *ok = 0;
- return i;
- }
- }
- else
- i = 0;
-
- /* XDTLS: an incorrectly formatted fragment should cause the
- * handshake to fail */
- OPENSSL_assert(i == (int)frag_len);
-
- *ok = 1;
-
- /* Note that s->init_num is *not* used as current offset in
- * s->init_buf->data, but as a counter summing up fragments'
- * lengths: as soon as they sum up to handshake packet
- * length, we assume we have got all the fragments. */
- s->init_num += frag_len;
- return frag_len;
-
-f_err:
- ssl3_send_alert(s,SSL3_AL_FATAL,al);
- s->init_num = 0;
-
- *ok=0;
- 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;
-
-#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
- * ssl->enc_read_ctx re-init
- * ssl->s3->read_sequence zero
- * ssl->s3->read_mac_secret re-init
- * ssl->session->read_sym_enc assign
- * ssl->session->read_compression assign
- * ssl->session->read_hash assign
+dtls1_get_message_fragment(SSL *s, int st1, int stn, int mt, int *ok)
+{
+ long len;
+
+ do {
+ *ok = dtls_get_reassembled_message(s, &len);
+ /* A CCS isn't a real handshake message, so if we get one there is no
+ * message sequence number to give us confidence that this was really
+ * intended to be at this point in the handshake sequence. Therefore we
+ * only allow this if we were explicitly looking for it (i.e. if |mt|
+ * is -1 we still don't allow it). If we get one when we're not
+ * expecting it then probably something got re-ordered or this is a
+ * retransmit. We should drop this and try again.
+ */
+ } while (*ok && mt != SSL3_MT_CHANGE_CIPHER_SPEC
+ && s->s3->tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC);
+
+ if (*ok)
+ s->state = stn;
+
+ return len;
+}
+
+static int dtls_get_reassembled_message(SSL *s, long *len)
+{
+ unsigned char wire[DTLS1_HM_HEADER_LENGTH];
+ unsigned long mlen, frag_off, frag_len;
+ int i, al, recvd_type;
+ struct hm_header_st msg_hdr;
+ int ok;
+
+ redo:
+ /* see if we have the required fragment already */
+ if ((frag_len = dtls1_retrieve_buffered_fragment(s, &ok)) || ok) {
+ if (ok)
+ s->init_num = frag_len;
+ *len = frag_len;
+ return ok;
+ }
+
+ /* read handshake message header */
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, &recvd_type, wire,
+ DTLS1_HM_HEADER_LENGTH, 0);
+ if (i <= 0) { /* nbio, or an error */
+ s->rwstate = SSL_READING;
+ *len = i;
+ return 0;
+ }
+ if(recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) {
+ if (wire[0] != SSL3_MT_CCS) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS_GET_REASSEMBLED_MESSAGE,
+ SSL_R_BAD_CHANGE_CIPHER_SPEC);
+ goto f_err;
+ }
+
+ memcpy(s->init_buf->data, wire, i);
+ s->init_num = i - 1;
+ s->init_msg = s->init_buf->data + 1;
+ s->s3->tmp.message_type = SSL3_MT_CHANGE_CIPHER_SPEC;
+ s->s3->tmp.message_size = i - 1;
+ *len = i - 1;
+ return 1;
+ }
+
+ /* Handshake fails if message header is incomplete */
+ if (i != DTLS1_HM_HEADER_LENGTH) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL_R_UNEXPECTED_MESSAGE);
+ goto f_err;
+ }
+
+ /* parse the message fragment header */
+ dtls1_get_message_header(wire, &msg_hdr);
+
+ mlen = msg_hdr.msg_len;
+ frag_off = msg_hdr.frag_off;
+ frag_len = msg_hdr.frag_len;
+
+ /*
+ * We must have at least frag_len bytes left in the record to be read.
+ * Fragments must not span records.
+ */
+ if (frag_len > RECORD_LAYER_get_rrec_length(&s->rlayer)) {
+ al = SSL3_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL_R_BAD_LENGTH);
+ goto f_err;
+ }
+
+ /*
+ * if this is a future (or stale) message it gets buffered
+ * (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) {
+ *len = dtls1_process_out_of_seq_message(s, &msg_hdr, &ok);
+ return ok;
+ }
+
+ if (frag_len && frag_len < mlen) {
+ *len = dtls1_reassemble_fragment(s, &msg_hdr, &ok);
+ return ok;
+ }
+
+ if (!s->server && s->d1->r_msg_hdr.frag_off == 0 &&
+ wire[0] == SSL3_MT_HELLO_REQUEST) {
+ /*
+ * The server may always send 'Hello Request' messages -- we are
+ * doing a handshake anyway now, so ignore them if their format is
+ * correct. Does not count for 'Finished' MAC.
+ */
+ if (wire[1] == 0 && wire[2] == 0 && wire[3] == 0) {
+ if (s->msg_callback)
+ s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
+ wire, DTLS1_HM_HEADER_LENGTH, s,
+ s->msg_callback_arg);
+
+ s->init_num = 0;
+ goto redo;
+ } else { /* Incorrectly formated Hello request */
+
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_DTLS_GET_REASSEMBLED_MESSAGE,
+ SSL_R_UNEXPECTED_MESSAGE);
+ goto f_err;
+ }
+ }
+
+ if ((al = dtls1_preprocess_fragment(s, &msg_hdr)))
+ goto f_err;
+
+ if (frag_len > 0) {
+ unsigned char *p =
+ (unsigned char *)s->init_buf->data + DTLS1_HM_HEADER_LENGTH;
+
+ i = s->method->ssl_read_bytes(s, SSL3_RT_HANDSHAKE, NULL,
+ &p[frag_off], frag_len, 0);
+
+ /*
+ * This shouldn't ever fail due to NBIO because we already checked
+ * that we have enough data in the record
+ */
+ if (i <= 0) {
+ s->rwstate = SSL_READING;
+ *len = i;
+ return 0;
+ }
+ } else
+ i = 0;
+
+ /*
+ * XDTLS: an incorrectly formatted fragment should cause the handshake
+ * to fail
+ */
+ if (i != (int)frag_len) {
+ al = SSL3_AD_ILLEGAL_PARAMETER;
+ SSLerr(SSL_F_DTLS_GET_REASSEMBLED_MESSAGE, SSL3_AD_ILLEGAL_PARAMETER);
+ goto f_err;
+ }
+
+ /*
+ * Note that s->init_num is *not* used as current offset in
+ * s->init_buf->data, but as a counter summing up fragments' lengths: as
+ * soon as they sum up to handshake packet length, we assume we have got
+ * all the fragments.
+ */
+ *len = s->init_num = frag_len;
+ return 1;
+
+ f_err:
+ ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ s->init_num = 0;
+ *len = -1;
+ return 0;
+}
+
+/*-
+ * for these 2 messages, we need to
+ * ssl->enc_read_ctx re-init
+ * ssl->rlayer.read_sequence zero
+ * ssl->s3->read_mac_secret re-init
+ * ssl->session->read_sym_enc assign
+ * ssl->session->read_compression assign
+ * ssl->session->read_hash assign
*/
int dtls1_send_change_cipher_spec(SSL *s, int a, int b)
- {
- unsigned char *p;
-
- if (s->state == a)
- {
- p=(unsigned char *)s->init_buf->data;
- *p++=SSL3_MT_CCS;
- s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
- s->d1->next_handshake_write_seq++;
-
- s->init_num=DTLS1_CCS_HEADER_LENGTH;
- s->init_off=0;
-
- dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
- s->d1->handshake_write_seq, 0, 0);
-
- /* buffer the message to handle re-xmits */
- dtls1_buffer_message(s, 1);
-
- s->state=b;
- }
-
- /* SSL3_ST_CW_CHANGE_B */
- return(dtls1_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
- }
-
-unsigned long dtls1_output_cert_chain(SSL *s, X509 *x)
- {
- unsigned char *p;
- int n,i;
- unsigned long l= 3 + DTLS1_HM_HEADER_LENGTH;
- BUF_MEM *buf;
- X509_STORE_CTX xs_ctx;
- X509_OBJECT obj;
-
- /* 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)
- {
- if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
- {
- SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
- return(0);
- }
-
- for (;;)
- {
- n=i2d_X509(x,NULL);
- if (!BUF_MEM_grow_clean(buf,(n+l+3)))
- {
- SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
- return(0);
- }
- p=(unsigned char *)&(buf->data[l]);
- l2n3(n,p);
- i2d_X509(x,&p);
- l+=n+3;
- if (X509_NAME_cmp(X509_get_subject_name(x),
- X509_get_issuer_name(x)) == 0) break;
-
- i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
- X509_get_issuer_name(x),&obj);
- if (i <= 0) break;
- x=obj.data.x509;
- /* Count is one too high since the X509_STORE_get uped the
- * ref count */
- X509_free(x);
- }
-
- X509_STORE_CTX_cleanup(&xs_ctx);
- }
-
- /* Thawte special :-) */
- if (s->ctx->extra_certs != NULL)
- for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
- {
- x=sk_X509_value(s->ctx->extra_certs,i);
- n=i2d_X509(x,NULL);
- if (!BUF_MEM_grow_clean(buf,(n+l+3)))
- {
- SSLerr(SSL_F_DTLS1_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
- return(0);
- }
- p=(unsigned char *)&(buf->data[l]);
- l2n3(n,p);
- i2d_X509(x,&p);
- l+=n+3;
- }
-
- 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);
- }
+{
+ unsigned char *p;
-int dtls1_read_failed(SSL *s, int code)
- {
- DTLS1_STATE *state;
- BIO *bio;
- int send_alert = 0;
-
- if ( code > 0)
- {
- fprintf( stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
- return 1;
- }
-
- bio = SSL_get_rbio(s);
- if ( ! BIO_dgram_recv_timedout(bio))
- {
- /* not a timeout, none of our business,
- let higher layers handle this. in fact it's probably an error */
- return code;
- }
-
- if ( ! SSL_in_init(s)) /* done, no need to send a retransmit */
- {
- BIO_set_flags(SSL_get_rbio(s), BIO_FLAGS_READ);
- return code;
- }
-
- state = s->d1;
- state->timeout.num_alerts++;
- if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
- {
- /* fail the connection, enough alerts have been sent */
- SSLerr(SSL_F_DTLS1_READ_FAILED,SSL_R_READ_TIMEOUT_EXPIRED);
- return 0;
- }
-
- state->timeout.read_timeouts++;
- if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
- {
- send_alert = 1;
- state->timeout.read_timeouts = 1;
- }
-
-
-#if 0 /* for now, each alert contains only one record number */
- item = pqueue_peek(state->rcvd_records);
- if ( item )
- {
- /* send an alert immediately for all the missing records */
- }
- else
-#endif
+ if (s->state == a) {
+ p = (unsigned char *)s->init_buf->data;
+ *p++ = SSL3_MT_CCS;
+ s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
+ s->init_num = DTLS1_CCS_HEADER_LENGTH;
-#if 0 /* no more alert sending, just retransmit the last set of messages */
- if ( send_alert)
- ssl3_send_alert(s,SSL3_AL_WARNING,
- DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
-#endif
+ if (s->version == DTLS1_BAD_VER) {
+ s->d1->next_handshake_write_seq++;
+ s2n(s->d1->handshake_write_seq, p);
+ s->init_num += 2;
+ }
- return dtls1_retransmit_buffered_messages(s) ;
- }
+ s->init_off = 0;
+ dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
+ s->d1->handshake_write_seq, 0, 0);
-static int
-dtls1_retransmit_buffered_messages(SSL *s)
- {
- pqueue sent = s->d1->sent_messages;
- piterator iter;
- pitem *item;
- hm_fragment *frag;
- int found = 0;
-
- iter = pqueue_iterator(sent);
-
- for ( item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter))
- {
- frag = (hm_fragment *)item->data;
- if ( dtls1_retransmit_message(s, frag->msg_header.seq, 0, &found) <= 0 &&
- found)
- {
- fprintf(stderr, "dtls1_retransmit_message() failed\n");
- return -1;
- }
- }
-
- return 1;
- }
+ /* buffer the message to handle re-xmits */
+ if (!dtls1_buffer_message(s, 1)) {
+ SSLerr(SSL_F_DTLS1_SEND_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
-int
-dtls1_buffer_message(SSL *s, int is_ccs)
- {
- pitem *item;
- hm_fragment *frag;
- unsigned char seq64be[8];
-
- /* this function is called immediately after a message has
- * been serialized */
- OPENSSL_assert(s->init_off == 0);
-
- frag = dtls1_hm_fragment_new(s->init_num);
-
- memcpy(frag->fragment, s->init_buf->data, s->init_num);
-
- if ( is_ccs)
- {
- OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
- DTLS1_CCS_HEADER_LENGTH == (unsigned int)s->init_num);
- }
- else
- {
- OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
- DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
- }
-
- frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
- frag->msg_header.seq = s->d1->w_msg_hdr.seq;
- frag->msg_header.type = s->d1->w_msg_hdr.type;
- frag->msg_header.frag_off = 0;
- frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
- frag->msg_header.is_ccs = is_ccs;
-
- memset(seq64be,0,sizeof(seq64be));
- seq64be[6] = (unsigned char)(frag->msg_header.seq>>8);
- seq64be[7] = (unsigned char)(frag->msg_header.seq);
-
- item = pitem_new(seq64be, frag);
- if ( item == NULL)
- {
- dtls1_hm_fragment_free(frag);
- return 0;
- }
-
-#if 0
- fprintf( stderr, "buffered messge: \ttype = %xx\n", msg_buf->type);
- fprintf( stderr, "\t\t\t\t\tlen = %d\n", msg_buf->len);
- fprintf( stderr, "\t\t\t\t\tseq_num = %d\n", msg_buf->seq_num);
+ s->state = b;
+ }
+
+ /* SSL3_ST_CW_CHANGE_B */
+ return (dtls1_do_write(s, SSL3_RT_CHANGE_CIPHER_SPEC));
+}
+
+int dtls1_read_failed(SSL *s, int code)
+{
+ if (code > 0) {
+ fprintf(stderr, "invalid state reached %s:%d", __FILE__, __LINE__);
+ return 1;
+ }
+
+ if (!dtls1_is_timer_expired(s)) {
+ /*
+ * not a timeout, none of our business, let higher layers handle
+ * this. in fact it's probably an error
+ */
+ return code;
+ }
+#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;
+ }
- pqueue_insert(s->d1->sent_messages, item);
- return 1;
- }
+ return dtls1_handle_timeout(s);
+}
+
+int dtls1_get_queue_priority(unsigned short seq, int is_ccs)
+{
+ /*
+ * The index of the retransmission queue actually is the message sequence
+ * number, since the queue only contains messages of a single handshake.
+ * However, the ChangeCipherSpec has no message sequence number and so
+ * using only the sequence will result in the CCS and Finished having the
+ * same index. To prevent this, the sequence number is multiplied by 2.
+ * In case of a CCS 1 is subtracted. This does not only differ CSS and
+ * Finished, it also maintains the order of the index (important for
+ * priority queues) and fits in the unsigned short variable.
+ */
+ return seq * 2 - is_ccs;
+}
+
+int dtls1_retransmit_buffered_messages(SSL *s)
+{
+ pqueue sent = s->d1->sent_messages;
+ piterator iter;
+ pitem *item;
+ hm_fragment *frag;
+ int found = 0;
+
+ iter = pqueue_iterator(sent);
+
+ for (item = pqueue_next(&iter); item != NULL; item = pqueue_next(&iter)) {
+ frag = (hm_fragment *)item->data;
+ if (dtls1_retransmit_message(s, (unsigned short)
+ dtls1_get_queue_priority
+ (frag->msg_header.seq,
+ frag->msg_header.is_ccs), 0,
+ &found) <= 0 && found) {
+ fprintf(stderr, "dtls1_retransmit_message() failed\n");
+ return -1;
+ }
+ }
+
+ return 1;
+}
+
+int dtls1_buffer_message(SSL *s, int is_ccs)
+{
+ pitem *item;
+ hm_fragment *frag;
+ unsigned char seq64be[8];
+
+ /*
+ * this function is called immediately after a message has been
+ * serialized
+ */
+ 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) {
+ /* For DTLS1_BAD_VER the header length is non-standard */
+ OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
+ ((s->version==DTLS1_BAD_VER)?3:DTLS1_CCS_HEADER_LENGTH)
+ == (unsigned int)s->init_num);
+ } else {
+ OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
+ DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);
+ }
+
+ frag->msg_header.msg_len = s->d1->w_msg_hdr.msg_len;
+ frag->msg_header.seq = s->d1->w_msg_hdr.seq;
+ frag->msg_header.type = s->d1->w_msg_hdr.type;
+ frag->msg_header.frag_off = 0;
+ frag->msg_header.frag_len = s->d1->w_msg_hdr.msg_len;
+ frag->msg_header.is_ccs = is_ccs;
+
+ /* save current state */
+ frag->msg_header.saved_retransmit_state.enc_write_ctx = s->enc_write_ctx;
+ frag->msg_header.saved_retransmit_state.write_hash = s->write_hash;
+ frag->msg_header.saved_retransmit_state.compress = s->compress;
+ frag->msg_header.saved_retransmit_state.session = s->session;
+ frag->msg_header.saved_retransmit_state.epoch =
+ DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer);
+
+ memset(seq64be, 0, sizeof(seq64be));
+ seq64be[6] =
+ (unsigned
+ char)(dtls1_get_queue_priority(frag->msg_header.seq,
+ frag->msg_header.is_ccs) >> 8);
+ seq64be[7] =
+ (unsigned
+ char)(dtls1_get_queue_priority(frag->msg_header.seq,
+ frag->msg_header.is_ccs));
+
+ item = pitem_new(seq64be, frag);
+ if (item == NULL) {
+ dtls1_hm_fragment_free(frag);
+ return 0;
+ }
+
+ pqueue_insert(s->d1->sent_messages, item);
+ return 1;
+}
int
dtls1_retransmit_message(SSL *s, unsigned short seq, unsigned long frag_off,
- int *found)
- {
- int ret;
- /* XDTLS: for now assuming that read/writes are blocking */
- pitem *item;
- hm_fragment *frag ;
- unsigned long header_length;
- unsigned char seq64be[8];
-
- /*
- OPENSSL_assert(s->init_num == 0);
- OPENSSL_assert(s->init_off == 0);
- */
-
- /* XDTLS: the requested message ought to be found, otherwise error */
- memset(seq64be,0,sizeof(seq64be));
- seq64be[6] = (unsigned char)(seq>>8);
- seq64be[7] = (unsigned char)seq;
-
- item = pqueue_find(s->d1->sent_messages, seq64be);
- if ( item == NULL)
- {
- fprintf(stderr, "retransmit: message %d non-existant\n", seq);
- *found = 0;
- return 0;
- }
-
- *found = 1;
- frag = (hm_fragment *)item->data;
-
- if ( frag->msg_header.is_ccs)
- header_length = DTLS1_CCS_HEADER_LENGTH;
- else
- header_length = DTLS1_HM_HEADER_LENGTH;
-
- memcpy(s->init_buf->data, frag->fragment,
- frag->msg_header.msg_len + header_length);
- s->init_num = frag->msg_header.msg_len + header_length;
-
- dtls1_set_message_header_int(s, frag->msg_header.type,
- frag->msg_header.msg_len, frag->msg_header.seq, 0,
- frag->msg_header.frag_len);
-
- s->d1->retransmitting = 1;
- ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
- SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
- s->d1->retransmitting = 0;
-
- (void)BIO_flush(SSL_get_wbio(s));
- return ret;
- }
+ int *found)
+{
+ int ret;
+ /* XDTLS: for now assuming that read/writes are blocking */
+ pitem *item;
+ hm_fragment *frag;
+ unsigned long header_length;
+ unsigned char seq64be[8];
+ struct dtls1_retransmit_state saved_state;
+
+ /*-
+ OPENSSL_assert(s->init_num == 0);
+ OPENSSL_assert(s->init_off == 0);
+ */
+
+ /* XDTLS: the requested message ought to be found, otherwise error */
+ memset(seq64be, 0, sizeof(seq64be));
+ seq64be[6] = (unsigned char)(seq >> 8);
+ seq64be[7] = (unsigned char)seq;
+
+ item = pqueue_find(s->d1->sent_messages, seq64be);
+ if (item == NULL) {
+ fprintf(stderr, "retransmit: message %d non-existant\n", seq);
+ *found = 0;
+ return 0;
+ }
+
+ *found = 1;
+ frag = (hm_fragment *)item->data;
+
+ if (frag->msg_header.is_ccs)
+ header_length = DTLS1_CCS_HEADER_LENGTH;
+ else
+ header_length = DTLS1_HM_HEADER_LENGTH;
+
+ memcpy(s->init_buf->data, frag->fragment,
+ frag->msg_header.msg_len + header_length);
+ s->init_num = frag->msg_header.msg_len + header_length;
+
+ dtls1_set_message_header_int(s, frag->msg_header.type,
+ frag->msg_header.msg_len,
+ frag->msg_header.seq, 0,
+ frag->msg_header.frag_len);
+
+ /* save current state */
+ saved_state.enc_write_ctx = s->enc_write_ctx;
+ saved_state.write_hash = s->write_hash;
+ saved_state.compress = s->compress;
+ saved_state.session = s->session;
+ saved_state.epoch = DTLS_RECORD_LAYER_get_w_epoch(&s->rlayer);
+
+ s->d1->retransmitting = 1;
+
+ /* restore state in which the message was originally sent */
+ s->enc_write_ctx = frag->msg_header.saved_retransmit_state.enc_write_ctx;
+ s->write_hash = frag->msg_header.saved_retransmit_state.write_hash;
+ s->compress = frag->msg_header.saved_retransmit_state.compress;
+ s->session = frag->msg_header.saved_retransmit_state.session;
+ DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer,
+ frag->msg_header.saved_retransmit_state.epoch);
+
+ ret = dtls1_do_write(s, frag->msg_header.is_ccs ?
+ SSL3_RT_CHANGE_CIPHER_SPEC : SSL3_RT_HANDSHAKE);
+
+ /* restore current state */
+ s->enc_write_ctx = saved_state.enc_write_ctx;
+ s->write_hash = saved_state.write_hash;
+ s->compress = saved_state.compress;
+ s->session = saved_state.session;
+ DTLS_RECORD_LAYER_set_saved_w_epoch(&s->rlayer, saved_state.epoch);
+
+ s->d1->retransmitting = 0;
+
+ (void)BIO_flush(SSL_get_wbio(s));
+ return ret;
+}
/* call this function when the buffered messages are no longer needed */
-void
-dtls1_clear_record_buffer(SSL *s)
- {
- pitem *item;
-
- for(item = pqueue_pop(s->d1->sent_messages);
- item != NULL; item = pqueue_pop(s->d1->sent_messages))
- {
- dtls1_hm_fragment_free((hm_fragment *)item->data);
- pitem_free(item);
- }
- }
-
-
-unsigned char *
-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)
- {
- s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
- s->d1->next_handshake_write_seq++;
- }
-
- dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
- frag_off, frag_len);
-
- return p += DTLS1_HM_HEADER_LENGTH;
- }
+void dtls1_clear_record_buffer(SSL *s)
+{
+ pitem *item;
+
+ for (item = pqueue_pop(s->d1->sent_messages);
+ item != NULL; item = pqueue_pop(s->d1->sent_messages)) {
+ dtls1_hm_fragment_free((hm_fragment *)item->data);
+ pitem_free(item);
+ }
+}
+
+void 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) {
+ s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
+ s->d1->next_handshake_write_seq++;
+ }
+ dtls1_set_message_header_int(s, mt, len, s->d1->handshake_write_seq,
+ frag_off, frag_len);
+}
/* don't actually do the writing, wait till the MTU has been retrieved */
static void
dtls1_set_message_header_int(SSL *s, unsigned char mt,
- unsigned long len, unsigned short seq_num, unsigned long frag_off,
- unsigned long frag_len)
- {
- struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
- msg_hdr->type = mt;
- msg_hdr->msg_len = len;
- msg_hdr->seq = seq_num;
- msg_hdr->frag_off = frag_off;
- msg_hdr->frag_len = frag_len;
- }
+ unsigned long len, unsigned short seq_num,
+ unsigned long frag_off, unsigned long frag_len)
+{
+ struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
+
+ msg_hdr->type = mt;
+ msg_hdr->msg_len = len;
+ msg_hdr->seq = seq_num;
+ msg_hdr->frag_off = frag_off;
+ msg_hdr->frag_len = frag_len;
+}
static void
dtls1_fix_message_header(SSL *s, unsigned long frag_off,
- unsigned long frag_len)
- {
- struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
- msg_hdr->frag_off = frag_off;
- msg_hdr->frag_len = frag_len;
- }
-
-static unsigned char *
-dtls1_write_message_header(SSL *s, unsigned char *p)
- {
- struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-
- *p++ = msg_hdr->type;
- l2n3(msg_hdr->msg_len, p);
+ unsigned long frag_len)
+{
+ struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
- s2n(msg_hdr->seq, p);
- l2n3(msg_hdr->frag_off, p);
- l2n3(msg_hdr->frag_len, p);
+ msg_hdr->frag_off = frag_off;
+ msg_hdr->frag_len = frag_len;
+}
- return p;
- }
+static unsigned char *dtls1_write_message_header(SSL *s, unsigned char *p)
+{
+ struct hm_header_st *msg_hdr = &s->d1->w_msg_hdr;
-static unsigned int
-dtls1_min_mtu(void)
- {
- return (g_probable_mtu[(sizeof(g_probable_mtu) /
- sizeof(g_probable_mtu[0])) - 1]);
- }
+ *p++ = msg_hdr->type;
+ l2n3(msg_hdr->msg_len, p);
-static unsigned int
-dtls1_guess_mtu(unsigned int curr_mtu)
- {
- unsigned int i;
+ s2n(msg_hdr->seq, p);
+ l2n3(msg_hdr->frag_off, p);
+ l2n3(msg_hdr->frag_len, p);
- if ( curr_mtu == 0 )
- return g_probable_mtu[0] ;
+ return p;
+}
- 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];
+unsigned int dtls1_link_min_mtu(void)
+{
+ return (g_probable_mtu[(sizeof(g_probable_mtu) /
+ sizeof(g_probable_mtu[0])) - 1]);
+}
- return curr_mtu;
- }
+unsigned int dtls1_min_mtu(SSL *s)
+{
+ 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)
- {
- memset(msg_hdr, 0x00, sizeof(struct hm_header_st));
- msg_hdr->type = *(data++);
- n2l3(data, msg_hdr->msg_len);
+{
+ memset(msg_hdr, 0, sizeof(*msg_hdr));
+ msg_hdr->type = *(data++);
+ n2l3(data, msg_hdr->msg_len);
- n2s(data, msg_hdr->seq);
- n2l3(data, msg_hdr->frag_off);
- n2l3(data, msg_hdr->frag_len);
- }
+ n2s(data, msg_hdr->seq);
+ n2l3(data, msg_hdr->frag_off);
+ n2l3(data, msg_hdr->frag_len);
+}
-void
-dtls1_get_ccs_header(unsigned char *data, struct ccs_header_st *ccs_hdr)
- {
- memset(ccs_hdr, 0x00, sizeof(struct ccs_header_st));
+int dtls1_shutdown(SSL *s)
+{
+ int ret;
+#ifndef OPENSSL_NO_SCTP
+ BIO *wbio;
+
+ wbio = SSL_get_wbio(s);
+ if (wbio != NULL && BIO_dgram_is_sctp(wbio) &&
+ !(s->shutdown & SSL_SENT_SHUTDOWN)) {
+ ret = BIO_dgram_sctp_wait_for_dry(wbio);
+ 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;
+}
- ccs_hdr->type = *(data++);
- }
+#ifndef OPENSSL_NO_HEARTBEATS
+int dtls1_process_heartbeat(SSL *s, unsigned char *p, unsigned int length)
+{
+ unsigned char *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,
+ p, length, s, s->msg_callback_arg);
+
+ /* Read type and payload length first */
+ if (1 + 2 + 16 > length)
+ return 0; /* silently discard */
+ if (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 > 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 */
+ if (RAND_bytes(bp, padding) <= 0) {
+ OPENSSL_free(buffer);
+ return -1;
+ }
+
+ 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 = -1;
+ 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 */
+ if (RAND_bytes(p, 16) <= 0) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+ p += 16;
+ /* Random padding */
+ if (RAND_bytes(p, padding) <= 0) {
+ SSLerr(SSL_F_DTLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
+ goto err;
+ }
+
+ 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;
+ }
+
+ err:
+ OPENSSL_free(buf);
+
+ return ret;
+}
+#endif
projects / openssl.git / blobdiff