/* ssl/d1_pkt.c */ /* * DTLS implementation written by Nagendra Modadugu * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. */ /* ==================================================================== * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #define USE_SOCKETS #include "ssl_locl.h" #include #include #include #include static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, int len, int peek); static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap); static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap); static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch); #if 0 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, unsigned long *offset); #endif static int dtls1_buffer_record(SSL *s, record_pqueue *q, PQ_64BIT * priority); static int dtls1_process_record(SSL *s, DTLS1_BITMAP *bitmap); #if PQ_64BIT_IS_INTEGER static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT * num); #endif /* copy buffered record into SSL structure */ static int dtls1_copy_record(SSL *s, pitem *item) { DTLS1_RECORD_DATA *rdata; rdata = (DTLS1_RECORD_DATA *)item->data; if (s->s3->rbuf.buf != NULL) OPENSSL_free(s->s3->rbuf.buf); s->packet = rdata->packet; s->packet_length = rdata->packet_length; memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); /* Set proper sequence number for mac calculation */ memcpy(&(s->s3->read_sequence[2]), &(rdata->packet[5]), 6); return (1); } static int dtls1_buffer_record(SSL *s, record_pqueue *queue, PQ_64BIT * priority) { DTLS1_RECORD_DATA *rdata; pitem *item; /* Limit the size of the queue to prevent DOS attacks */ if (pqueue_size(queue->q) >= 100) return 0; rdata = OPENSSL_malloc(sizeof(DTLS1_RECORD_DATA)); item = pitem_new(*priority, rdata); if (rdata == NULL || item == NULL) { if (rdata != NULL) OPENSSL_free(rdata); if (item != NULL) pitem_free(item); SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); return (0); } rdata->packet = s->packet; rdata->packet_length = s->packet_length; memcpy(&(rdata->rbuf), &(s->s3->rbuf), sizeof(SSL3_BUFFER)); memcpy(&(rdata->rrec), &(s->s3->rrec), sizeof(SSL3_RECORD)); item->data = rdata; /* insert should not fail, since duplicates are dropped */ if (pqueue_insert(queue->q, item) == NULL) { OPENSSL_free(rdata); pitem_free(item); return (0); } s->packet = NULL; s->packet_length = 0; memset(&(s->s3->rbuf), 0, sizeof(SSL3_BUFFER)); memset(&(s->s3->rrec), 0, sizeof(SSL3_RECORD)); if (!ssl3_setup_buffers(s)) { SSLerr(SSL_F_DTLS1_BUFFER_RECORD, ERR_R_INTERNAL_ERROR); OPENSSL_free(rdata); pitem_free(item); return (0); } return (1); } static int dtls1_retrieve_buffered_record(SSL *s, record_pqueue *queue) { pitem *item; item = pqueue_pop(queue->q); if (item) { dtls1_copy_record(s, item); OPENSSL_free(item->data); pitem_free(item); return (1); } return (0); } /* * retrieve a buffered record that belongs to the new epoch, i.e., not * processed yet */ #define dtls1_get_unprocessed_record(s) \ dtls1_retrieve_buffered_record((s), \ &((s)->d1->unprocessed_rcds)) /* * retrieve a buffered record that belongs to the current epoch, ie, * processed */ #define dtls1_get_processed_record(s) \ dtls1_retrieve_buffered_record((s), \ &((s)->d1->processed_rcds)) static int dtls1_process_buffered_records(SSL *s) { pitem *item; SSL3_BUFFER *rb; SSL3_RECORD *rr; DTLS1_BITMAP *bitmap; unsigned int is_next_epoch; int replayok = 1; item = pqueue_peek(s->d1->unprocessed_rcds.q); if (item) { /* Check if epoch is current. */ if (s->d1->unprocessed_rcds.epoch != s->d1->r_epoch) return 1; /* Nothing to do. */ rr = &s->s3->rrec; rb = &s->s3->rbuf; if (rb->left > 0) { /* * We've still got data from the current packet to read. There could * be a record from the new epoch in it - so don't overwrite it * with the unprocessed records yet (we'll do it when we've * finished reading the current packet). */ return 1; } /* Process all the records. */ while (pqueue_peek(s->d1->unprocessed_rcds.q)) { dtls1_get_unprocessed_record(s); bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); if (bitmap == NULL) { /* * Should not happen. This will only ever be NULL when the * current record is from a different epoch. But that cannot * be the case because we already checked the epoch above */ SSLerr(SSL_F_DTLS1_PROCESS_BUFFERED_RECORDS, ERR_R_INTERNAL_ERROR); return 0; } { /* * Check whether this is a repeat, or aged record. We did this * check once already when we first received the record - but * we might have updated the window since then due to * records we subsequently processed. */ replayok = dtls1_record_replay_check(s, bitmap); } if (!replayok || !dtls1_process_record(s, bitmap)) { /* dump this record */ rr->length = 0; s->packet_length = 0; continue; } if (dtls1_buffer_record(s, &(s->d1->processed_rcds), &s->s3->rrec.seq_num) < 0) return 0; } } /* * sync epoch numbers once all the unprocessed records have been * processed */ s->d1->processed_rcds.epoch = s->d1->r_epoch; s->d1->unprocessed_rcds.epoch = s->d1->r_epoch + 1; return 1; } #if 0 static int dtls1_get_buffered_record(SSL *s) { pitem *item; PQ_64BIT priority = (((PQ_64BIT) s->d1->handshake_read_seq) << 32) | ((PQ_64BIT) s->d1->r_msg_hdr.frag_off); /* if we're not (re)negotiating, nothing buffered */ if (!SSL_in_init(s)) return 0; item = pqueue_peek(s->d1->rcvd_records); if (item && item->priority == priority) { /* * Check if we've received the record of interest. It must be a * handshake record, since data records as passed up without * buffering */ DTLS1_RECORD_DATA *rdata; item = pqueue_pop(s->d1->rcvd_records); rdata = (DTLS1_RECORD_DATA *)item->data; if (s->s3->rbuf.buf != NULL) OPENSSL_free(s->s3->rbuf.buf); s->packet = rdata->packet; s->packet_length = rdata->packet_length; memcpy(&(s->s3->rbuf), &(rdata->rbuf), sizeof(SSL3_BUFFER)); memcpy(&(s->s3->rrec), &(rdata->rrec), sizeof(SSL3_RECORD)); OPENSSL_free(item->data); pitem_free(item); /* s->d1->next_expected_seq_num++; */ return (1); } return 0; } #endif static int dtls1_process_record(SSL *s, DTLS1_BITMAP *bitmap) { int i, al; int enc_err; SSL_SESSION *sess; SSL3_RECORD *rr; unsigned int mac_size, orig_len; unsigned char md[EVP_MAX_MD_SIZE]; rr = &(s->s3->rrec); sess = s->session; /* * At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, * and we have that many bytes in s->packet */ rr->input = &(s->packet[DTLS1_RT_HEADER_LENGTH]); /* * ok, we can now read from 's->packet' data into 'rr' rr->input points * at rr->length bytes, which need to be copied into rr->data by either * the decryption or by the decompression When the data is 'copied' into * the rr->data buffer, rr->input will be pointed at the new buffer */ /* * We now have - encrypted [ MAC [ compressed [ plain ] ] ] rr->length * bytes of encrypted compressed stuff. */ /* check is not needed I believe */ if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) { al = SSL_AD_RECORD_OVERFLOW; SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); goto f_err; } /* decrypt in place in 'rr->input' */ rr->data = rr->input; enc_err = s->method->ssl3_enc->enc(s, 0); /*- * enc_err is: * 0: (in non-constant time) if the record is publically invalid. * 1: if the padding is valid * -1: if the padding is invalid */ if (enc_err == 0) { /* For DTLS we simply ignore bad packets. */ rr->length = 0; s->packet_length = 0; goto err; } #ifdef TLS_DEBUG printf("dec %d\n", rr->length); { unsigned int z; for (z = 0; z < rr->length; z++) printf("%02X%c", rr->data[z], ((z + 1) % 16) ? ' ' : '\n'); } printf("\n"); #endif /* r->length is now the compressed data plus mac */ if ((sess != NULL) && (s->enc_read_ctx != NULL) && (s->read_hash != NULL)) { /* s->read_hash != NULL => mac_size != -1 */ unsigned char *mac = NULL; unsigned char mac_tmp[EVP_MAX_MD_SIZE]; mac_size = EVP_MD_size(s->read_hash); OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE); /* * kludge: *_cbc_remove_padding passes padding length in rr->type */ orig_len = rr->length + ((unsigned int)rr->type >> 8); /* * orig_len is the length of the record before any padding was * removed. This is public information, as is the MAC in use, * therefore we can safely process the record in a different amount * of time if it's too short to possibly contain a MAC. */ if (orig_len < mac_size || /* CBC records must have a padding length byte too. */ (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE && orig_len < mac_size + 1)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_LENGTH_TOO_SHORT); goto f_err; } if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) { /* * We update the length so that the TLS header bytes can be * constructed correctly but we need to extract the MAC in * constant time from within the record, without leaking the * contents of the padding bytes. */ mac = mac_tmp; ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len); rr->length -= mac_size; } else { /* * In this case there's no padding, so |orig_len| equals * |rec->length| and we checked that there's enough bytes for * |mac_size| above. */ rr->length -= mac_size; mac = &rr->data[rr->length]; } i = s->method->ssl3_enc->mac(s, md, 0 /* not send */ ); if (i < 0 || mac == NULL || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) enc_err = -1; if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size) enc_err = -1; } if (enc_err < 0) { /* decryption failed, silently discard message */ rr->length = 0; s->packet_length = 0; goto err; } /* r->length is now just compressed */ if (s->expand != NULL) { if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) { al = SSL_AD_RECORD_OVERFLOW; SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG); goto f_err; } if (!ssl3_do_uncompress(s)) { al = SSL_AD_DECOMPRESSION_FAILURE; SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_BAD_DECOMPRESSION); goto f_err; } } if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH) { al = SSL_AD_RECORD_OVERFLOW; SSLerr(SSL_F_DTLS1_PROCESS_RECORD, SSL_R_DATA_LENGTH_TOO_LONG); goto f_err; } rr->off = 0; /*- * So at this point the following is true * ssl->s3->rrec.type is the type of record * ssl->s3->rrec.length == number of bytes in record * ssl->s3->rrec.off == offset to first valid byte * ssl->s3->rrec.data == where to take bytes from, increment * after use :-). */ /* we have pulled in a full packet so zero things */ s->packet_length = 0; /* Mark receipt of record. */ dtls1_record_bitmap_update(s, bitmap); return (1); f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (0); } /*- * Call this to get a new input record. * It will return <= 0 if more data is needed, normally due to an error * or non-blocking IO. * When it finishes, one packet has been decoded and can be found in * ssl->s3->rrec.type - is the type of record * ssl->s3->rrec.data, - data * ssl->s3->rrec.length, - number of bytes */ /* used only by dtls1_read_bytes */ int dtls1_get_record(SSL *s) { int ssl_major, ssl_minor; int i, n; SSL3_RECORD *rr; unsigned char *p = NULL; unsigned short version; DTLS1_BITMAP *bitmap; unsigned int is_next_epoch; rr = &(s->s3->rrec); again: /* * The epoch may have changed. If so, process all the pending records. * This is a non-blocking operation. */ dtls1_process_buffered_records(s); /* if we're renegotiating, then there may be buffered records */ if (dtls1_get_processed_record(s)) return 1; /* get something from the wire */ /* check if we have the header */ if ((s->rstate != SSL_ST_READ_BODY) || (s->packet_length < DTLS1_RT_HEADER_LENGTH)) { n = ssl3_read_n(s, DTLS1_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); /* read timeout is handled by dtls1_read_bytes */ if (n <= 0) return (n); /* error or non-blocking */ /* this packet contained a partial record, dump it */ if (s->packet_length != DTLS1_RT_HEADER_LENGTH) { s->packet_length = 0; goto again; } s->rstate = SSL_ST_READ_BODY; p = s->packet; /* Pull apart the header into the DTLS1_RECORD */ rr->type = *(p++); ssl_major = *(p++); ssl_minor = *(p++); version = (ssl_major << 8) | ssl_minor; /* sequence number is 64 bits, with top 2 bytes = epoch */ n2s(p, rr->epoch); memcpy(&(s->s3->read_sequence[2]), p, 6); p += 6; n2s(p, rr->length); /* Lets check version */ if (!s->first_packet) { if (version != s->version && version != DTLS1_BAD_VER) { /* unexpected version, silently discard */ rr->length = 0; s->packet_length = 0; goto again; } } if ((version & 0xff00) != (DTLS1_VERSION & 0xff00) && (version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) { /* wrong version, silently discard record */ rr->length = 0; s->packet_length = 0; goto again; } if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) { /* record too long, silently discard it */ rr->length = 0; s->packet_length = 0; goto again; } s->client_version = version; /* now s->rstate == SSL_ST_READ_BODY */ } /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ if (rr->length > s->packet_length - DTLS1_RT_HEADER_LENGTH) { /* now s->packet_length == DTLS1_RT_HEADER_LENGTH */ i = rr->length; n = ssl3_read_n(s, i, i, 1); /* this packet contained a partial record, dump it */ if (n != i) { rr->length = 0; s->packet_length = 0; goto again; } /* * now n == rr->length, and s->packet_length == * DTLS1_RT_HEADER_LENGTH + rr->length */ } s->rstate = SSL_ST_READ_HEADER; /* set state for later operations */ /* match epochs. NULL means the packet is dropped on the floor */ bitmap = dtls1_get_bitmap(s, rr, &is_next_epoch); if (bitmap == NULL) { rr->length = 0; s->packet_length = 0; /* dump this record */ goto again; /* get another record */ } /* * Check whether this is a repeat, or aged record. Don't check if we're * listening and this message is a ClientHello. They can look as if * they're replayed, since they arrive from different connections and * would be dropped unnecessarily. */ if (!(s->d1->listen && rr->type == SSL3_RT_HANDSHAKE && s->packet_length > DTLS1_RT_HEADER_LENGTH && s->packet[DTLS1_RT_HEADER_LENGTH] == SSL3_MT_CLIENT_HELLO) && !dtls1_record_replay_check(s, bitmap)) { rr->length = 0; s->packet_length = 0; /* dump this record */ goto again; /* get another record */ } /* just read a 0 length packet */ if (rr->length == 0) goto again; /* * If this record is from the next epoch (either HM or ALERT), and a * handshake is currently in progress, buffer it since it cannot be * processed at this time. However, do not buffer anything while * listening. */ if (is_next_epoch) { if ((SSL_in_init(s) || s->in_handshake) && !s->d1->listen) { if (dtls1_buffer_record (s, &(s->d1->unprocessed_rcds), &rr->seq_num) < 0) return -1; } rr->length = 0; s->packet_length = 0; goto again; } if (!dtls1_process_record(s, bitmap)) { rr->length = 0; s->packet_length = 0; /* dump this record */ goto again; /* get another record */ } return (1); } /*- * Return up to 'len' payload bytes received in 'type' records. * 'type' is one of the following: * * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) * - 0 (during a shutdown, no data has to be returned) * * If we don't have stored data to work from, read a SSL/TLS record first * (possibly multiple records if we still don't have anything to return). * * This function must handle any surprises the peer may have for us, such as * Alert records (e.g. close_notify), ChangeCipherSpec records (not really * a surprise, but handled as if it were), or renegotiation requests. * Also if record payloads contain fragments too small to process, we store * them until there is enough for the respective protocol (the record protocol * may use arbitrary fragmentation and even interleaving): * Change cipher spec protocol * just 1 byte needed, no need for keeping anything stored * Alert protocol * 2 bytes needed (AlertLevel, AlertDescription) * Handshake protocol * 4 bytes needed (HandshakeType, uint24 length) -- we just have * to detect unexpected Client Hello and Hello Request messages * here, anything else is handled by higher layers * Application data protocol * none of our business */ int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) { int al, i, j, ret; unsigned int n; SSL3_RECORD *rr; void (*cb) (const SSL *ssl, int type2, int val) = NULL; if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ if (!ssl3_setup_buffers(s)) return (-1); /* XXX: check what the second '&& type' is about */ if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || (peek && (type != SSL3_RT_APPLICATION_DATA))) { SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); return -1; } /* * check whether there's a handshake message (client hello?) waiting */ if ((ret = have_handshake_fragment(s, type, buf, len, peek))) return ret; /* * Now s->d1->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. */ if (!s->in_handshake && SSL_in_init(s)) { /* type == SSL3_RT_APPLICATION_DATA */ i = s->handshake_func(s); if (i < 0) return (i); if (i == 0) { SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); return (-1); } } start: s->rwstate = SSL_NOTHING; /*- * s->s3->rrec.type - is the type of record * s->s3->rrec.data, - data * s->s3->rrec.off, - offset into 'data' for next read * s->s3->rrec.length, - number of bytes. */ rr = &(s->s3->rrec); /* * We are not handshaking and have no data yet, so process data buffered * during the last handshake in advance, if any. */ if (s->state == SSL_ST_OK && rr->length == 0) { pitem *item; item = pqueue_pop(s->d1->buffered_app_data.q); if (item) { dtls1_copy_record(s, item); OPENSSL_free(item->data); pitem_free(item); } } /* Check for timeout */ if (dtls1_handle_timeout(s) > 0) goto start; /* get new packet if necessary */ if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) { ret = dtls1_get_record(s); if (ret <= 0) { ret = dtls1_read_failed(s, ret); /* anything other than a timeout is an error */ if (ret <= 0) return (ret); else goto start; } } if (s->d1->listen && rr->type != SSL3_RT_HANDSHAKE) { rr->length = 0; goto start; } /* * Reset the count of consecutive warning alerts if we've got a non-empty * record that isn't an alert. */ if (rr->type != SSL3_RT_ALERT && rr->length != 0) s->s3->alert_count = 0; /* we now have a packet which can be read and processed */ if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, * reset by ssl3_get_finished */ && (rr->type != SSL3_RT_HANDSHAKE)) { /* * We now have application data between CCS and Finished. Most likely * the packets were reordered on their way, so buffer the application * data for later processing rather than dropping the connection. */ dtls1_buffer_record(s, &(s->d1->buffered_app_data), &rr->seq_num); rr->length = 0; goto start; } /* * If the other end has shut down, throw anything we read away (even in * 'peek' mode) */ if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { rr->length = 0; s->rwstate = SSL_NOTHING; return (0); } if (type == rr->type) { /* SSL3_RT_APPLICATION_DATA or * SSL3_RT_HANDSHAKE */ /* * make sure that we are not getting application data when we are * doing a handshake for the first time */ if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && (s->enc_read_ctx == NULL)) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); goto f_err; } if (len <= 0) return (len); if ((unsigned int)len > rr->length) n = rr->length; else n = (unsigned int)len; memcpy(buf, &(rr->data[rr->off]), n); if (!peek) { rr->length -= n; rr->off += n; if (rr->length == 0) { s->rstate = SSL_ST_READ_HEADER; rr->off = 0; } } return (n); } /* * If we get here, then type != rr->type; if we have a handshake message, * then it was unexpected (Hello Request or Client Hello). */ /* * In case of record types for which we have 'fragment' storage, fill * that so that we can process the data at a fixed place. */ { unsigned int k, dest_maxlen = 0; unsigned char *dest = NULL; unsigned int *dest_len = NULL; if (rr->type == SSL3_RT_HANDSHAKE) { dest_maxlen = sizeof s->d1->handshake_fragment; dest = s->d1->handshake_fragment; dest_len = &s->d1->handshake_fragment_len; } else if (rr->type == SSL3_RT_ALERT) { dest_maxlen = sizeof(s->d1->alert_fragment); dest = s->d1->alert_fragment; dest_len = &s->d1->alert_fragment_len; } /* else it's a CCS message, or application data or wrong */ else if (rr->type != SSL3_RT_CHANGE_CIPHER_SPEC) { /* * Application data while renegotiating is allowed. Try again * reading. */ if (rr->type == SSL3_RT_APPLICATION_DATA) { BIO *bio; s->s3->in_read_app_data = 2; bio = SSL_get_rbio(s); s->rwstate = SSL_READING; BIO_clear_retry_flags(bio); BIO_set_retry_read(bio); return (-1); } /* Not certain if this is the right error handling */ al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); goto f_err; } if (dest_maxlen > 0) { /* * XDTLS: In a pathalogical case, the Client Hello may be * fragmented--don't always expect dest_maxlen bytes */ if (rr->length < dest_maxlen) { #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE /* * for normal alerts rr->length is 2, while * dest_maxlen is 7 if we were to handle this * non-existing alert... */ FIX ME #endif s->rstate = SSL_ST_READ_HEADER; rr->length = 0; goto start; } /* now move 'n' bytes: */ for (k = 0; k < dest_maxlen; k++) { dest[k] = rr->data[rr->off++]; rr->length--; } *dest_len = dest_maxlen; } } /*- * s->d1->handshake_fragment_len == 12 iff rr->type == SSL3_RT_HANDSHAKE; * s->d1->alert_fragment_len == 7 iff rr->type == SSL3_RT_ALERT. * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) */ /* If we are a client, check for an incoming 'Hello Request': */ if ((!s->server) && (s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && (s->d1->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && (s->session != NULL) && (s->session->cipher != NULL)) { s->d1->handshake_fragment_len = 0; if ((s->d1->handshake_fragment[1] != 0) || (s->d1->handshake_fragment[2] != 0) || (s->d1->handshake_fragment[3] != 0)) { al = SSL_AD_DECODE_ERROR; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); goto err; } /* * no need to check sequence number on HELLO REQUEST messages */ if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->d1->handshake_fragment, 4, s, s->msg_callback_arg); if (SSL_is_init_finished(s) && !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && !s->s3->renegotiate) { s->d1->handshake_read_seq++; ssl3_renegotiate(s); if (ssl3_renegotiate_check(s)) { i = s->handshake_func(s); if (i < 0) return (i); if (i == 0) { SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); return (-1); } if (!(s->mode & SSL_MODE_AUTO_RETRY)) { if (s->s3->rbuf.left == 0) { /* no read-ahead left? */ BIO *bio; /* * In the case where we try to read application data, * but we trigger an SSL handshake, we return -1 with * the retry option set. Otherwise renegotiation may * cause nasty problems in the blocking world */ s->rwstate = SSL_READING; bio = SSL_get_rbio(s); BIO_clear_retry_flags(bio); BIO_set_retry_read(bio); return (-1); } } } } /* * we either finished a handshake or ignored the request, now try * again to obtain the (application) data we were asked for */ goto start; } if (s->d1->alert_fragment_len >= DTLS1_AL_HEADER_LENGTH) { int alert_level = s->d1->alert_fragment[0]; int alert_descr = s->d1->alert_fragment[1]; s->d1->alert_fragment_len = 0; if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_ALERT, s->d1->alert_fragment, 2, s, s->msg_callback_arg); if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; if (cb != NULL) { j = (alert_level << 8) | alert_descr; cb(s, SSL_CB_READ_ALERT, j); } if (alert_level == 1) { /* warning */ s->s3->warn_alert = alert_descr; s->s3->alert_count++; if (s->s3->alert_count == MAX_WARN_ALERT_COUNT) { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_TOO_MANY_WARN_ALERTS); goto f_err; } if (alert_descr == SSL_AD_CLOSE_NOTIFY) { s->shutdown |= SSL_RECEIVED_SHUTDOWN; return (0); } #if 0 /* XXX: this is a possible improvement in the future */ /* now check if it's a missing record */ if (alert_descr == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { unsigned short seq; unsigned int frag_off; unsigned char *p = &(s->d1->alert_fragment[2]); n2s(p, seq); n2l3(p, frag_off); dtls1_retransmit_message(s, dtls1_get_queue_priority (frag->msg_header.seq, 0), frag_off, &found); if (!found && SSL_in_init(s)) { /* * fprintf( stderr,"in init = %d\n", SSL_in_init(s)); */ /* * requested a message not yet sent, send an alert * ourselves */ ssl3_send_alert(s, SSL3_AL_WARNING, DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); } } #endif } else if (alert_level == 2) { /* fatal */ char tmp[16]; s->rwstate = SSL_NOTHING; s->s3->fatal_alert = alert_descr; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); ERR_add_error_data(2, "SSL alert number ", tmp); s->shutdown |= SSL_RECEIVED_SHUTDOWN; SSL_CTX_remove_session(s->ctx, s->session); return (0); } else { al = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); goto f_err; } goto start; } if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a * shutdown */ s->rwstate = SSL_NOTHING; rr->length = 0; return (0); } if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { struct ccs_header_st ccs_hdr; unsigned int ccs_hdr_len = DTLS1_CCS_HEADER_LENGTH; dtls1_get_ccs_header(rr->data, &ccs_hdr); /* * 'Change Cipher Spec' is just a single byte, so we know exactly * what the record payload has to look like */ /* XDTLS: check that epoch is consistent */ if (s->client_version == DTLS1_BAD_VER || s->version == DTLS1_BAD_VER) ccs_hdr_len = 3; if ((rr->length != ccs_hdr_len) || (rr->off != 0) || (rr->data[0] != SSL3_MT_CCS)) { i = SSL_AD_ILLEGAL_PARAMETER; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC); goto err; } rr->length = 0; if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, rr->data, 1, s, s->msg_callback_arg); /* * We can't process a CCS now, because previous handshake messages * are still missing, so just drop it. */ if (!s->d1->change_cipher_spec_ok) { goto start; } s->d1->change_cipher_spec_ok = 0; s->s3->change_cipher_spec = 1; if (!ssl3_do_change_cipher_spec(s)) goto err; /* do this whenever CCS is processed */ dtls1_reset_seq_numbers(s, SSL3_CC_READ); if (s->client_version == DTLS1_BAD_VER) s->d1->handshake_read_seq++; goto start; } /* * Unexpected handshake message (Client Hello, or protocol violation) */ if ((s->d1->handshake_fragment_len >= DTLS1_HM_HEADER_LENGTH) && !s->in_handshake) { struct hm_header_st msg_hdr; /* this may just be a stale retransmit */ dtls1_get_message_header(rr->data, &msg_hdr); if (rr->epoch != s->d1->r_epoch) { rr->length = 0; goto start; } /* * If we are server, we may have a repeated FINISHED of the client * here, then retransmit our CCS and FINISHED. */ if (msg_hdr.type == SSL3_MT_FINISHED) { if (dtls1_check_timeout_num(s) < 0) return -1; dtls1_retransmit_buffered_messages(s); rr->length = 0; goto start; } if (((s->state & SSL_ST_MASK) == SSL_ST_OK) && !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { #if 0 /* worked only because C operator preferences * are not as expected (and because this is * not really needed for clients except for * detecting protocol violations): */ s->state = SSL_ST_BEFORE | (s->server) ? SSL_ST_ACCEPT : SSL_ST_CONNECT; #else s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; #endif s->new_session = 1; } i = s->handshake_func(s); if (i < 0) return (i); if (i == 0) { SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); return (-1); } if (!(s->mode & SSL_MODE_AUTO_RETRY)) { if (s->s3->rbuf.left == 0) { /* no read-ahead left? */ BIO *bio; /* * In the case where we try to read application data, but we * trigger an SSL handshake, we return -1 with the retry * option set. Otherwise renegotiation may cause nasty * problems in the blocking world */ s->rwstate = SSL_READING; bio = SSL_get_rbio(s); BIO_clear_retry_flags(bio); BIO_set_retry_read(bio); return (-1); } } goto start; } switch (rr->type) { default: #ifndef OPENSSL_NO_TLS /* TLS just ignores unknown message types */ if (s->version == TLS1_VERSION) { rr->length = 0; goto start; } #endif al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); goto f_err; case SSL3_RT_CHANGE_CIPHER_SPEC: case SSL3_RT_ALERT: case SSL3_RT_HANDSHAKE: /* * we already handled all of these, with the possible exception of * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not * happen when type != rr->type */ al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, ERR_R_INTERNAL_ERROR); goto f_err; case SSL3_RT_APPLICATION_DATA: /* * At this point, we were expecting handshake data, but have * application data. If the library was running inside ssl3_read() * (i.e. in_read_app_data is set) and it makes sense to read * application data at this point (session renegotiation not yet * started), we will indulge it. */ if (s->s3->in_read_app_data && (s->s3->total_renegotiations != 0) && (((s->state & SSL_ST_CONNECT) && (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && (s->state <= SSL3_ST_CR_SRVR_HELLO_A) ) || ((s->state & SSL_ST_ACCEPT) && (s->state <= SSL3_ST_SW_HELLO_REQ_A) && (s->state >= SSL3_ST_SR_CLNT_HELLO_A) ) )) { s->s3->in_read_app_data = 2; return (-1); } else { al = SSL_AD_UNEXPECTED_MESSAGE; SSLerr(SSL_F_DTLS1_READ_BYTES, SSL_R_UNEXPECTED_RECORD); goto f_err; } } /* not reached */ f_err: ssl3_send_alert(s, SSL3_AL_FATAL, al); err: return (-1); } int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf_, int len) { int i; if (SSL_in_init(s) && !s->in_handshake) { i = s->handshake_func(s); if (i < 0) return (i); if (i == 0) { SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); return -1; } } if (len > SSL3_RT_MAX_PLAIN_LENGTH) { SSLerr(SSL_F_DTLS1_WRITE_APP_DATA_BYTES, SSL_R_DTLS_MESSAGE_TOO_BIG); return -1; } i = dtls1_write_bytes(s, type, buf_, len); return i; } /* * this only happens when a client hello is received and a handshake * is started. */ static int have_handshake_fragment(SSL *s, int type, unsigned char *buf, int len, int peek) { if ((type == SSL3_RT_HANDSHAKE) && (s->d1->handshake_fragment_len > 0)) /* (partially) satisfy request from storage */ { unsigned char *src = s->d1->handshake_fragment; unsigned char *dst = buf; unsigned int k, n; /* peek == 0 */ n = 0; while ((len > 0) && (s->d1->handshake_fragment_len > 0)) { *dst++ = *src++; len--; s->d1->handshake_fragment_len--; n++; } /* move any remaining fragment bytes: */ for (k = 0; k < s->d1->handshake_fragment_len; k++) s->d1->handshake_fragment[k] = *src++; return n; } return 0; } /* * Call this to write data in records of type 'type' It will return <= 0 if * not all data has been sent or non-blocking IO. */ int dtls1_write_bytes(SSL *s, int type, const void *buf, int len) { int i; OPENSSL_assert(len <= SSL3_RT_MAX_PLAIN_LENGTH); s->rwstate = SSL_NOTHING; i = do_dtls1_write(s, type, buf, len, 0); return i; } int do_dtls1_write(SSL *s, int type, const unsigned char *buf, unsigned int len, int create_empty_fragment) { unsigned char *p, *pseq; int i, mac_size, clear = 0; int prefix_len = 0; SSL3_RECORD *wr; SSL3_BUFFER *wb; SSL_SESSION *sess; int bs; /* * first check if there is a SSL3_BUFFER still being written out. This * will happen with non blocking IO */ if (s->s3->wbuf.left != 0) { OPENSSL_assert(0); /* XDTLS: want to see if we ever get here */ return (ssl3_write_pending(s, type, buf, len)); } /* If we have an alert to send, lets send it */ if (s->s3->alert_dispatch) { i = s->method->ssl_dispatch_alert(s); if (i <= 0) return (i); /* if it went, fall through and send more stuff */ } if (len == 0 && !create_empty_fragment) return 0; wr = &(s->s3->wrec); wb = &(s->s3->wbuf); sess = s->session; if ((sess == NULL) || (s->enc_write_ctx == NULL) || (s->write_hash == NULL)) clear = 1; if (clear) mac_size = 0; else mac_size = EVP_MD_size(s->write_hash); /* DTLS implements explicit IV, so no need for empty fragments */ #if 0 /* * 'create_empty_fragment' is true only when this function calls itself */ if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done && SSL_version(s) != DTLS1_VERSION && SSL_version(s) != DTLS1_BAD_VER) { /* * countermeasure against known-IV weakness in CBC ciphersuites (see * http://www.openssl.org/~bodo/tls-cbc.txt) */ if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) { /* * recursive function call with 'create_empty_fragment' set; this * prepares and buffers the data for an empty fragment (these * 'prefix_len' bytes are sent out later together with the actual * payload) */ prefix_len = s->method->do_ssl_write(s, type, buf, 0, 1); if (prefix_len <= 0) goto err; if (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) { /* insufficient space */ SSLerr(SSL_F_DO_DTLS1_WRITE, ERR_R_INTERNAL_ERROR); goto err; } } s->s3->empty_fragment_done = 1; } #endif p = wb->buf + prefix_len; /* write the header */ *(p++) = type & 0xff; wr->type = type; if (s->client_version == DTLS1_BAD_VER) *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff; else *(p++) = (s->version >> 8), *(p++) = s->version & 0xff; /* field where we are to write out packet epoch, seq num and len */ pseq = p; p += 10; /* lets setup the record stuff. */ /* * Make space for the explicit IV in case of CBC. (this is a bit of a * boundary violation, but what the heck). */ if (s->enc_write_ctx && (EVP_CIPHER_mode(s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) bs = EVP_CIPHER_block_size(s->enc_write_ctx->cipher); else bs = 0; wr->data = p + bs; /* make room for IV in case of CBC */ wr->length = (int)len; wr->input = (unsigned char *)buf; /* * we now 'read' from wr->input, wr->length bytes into wr->data */ /* first we compress */ if (s->compress != NULL) { if (!ssl3_do_compress(s)) { SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_COMPRESSION_FAILURE); goto err; } } else { memcpy(wr->data, wr->input, wr->length); wr->input = wr->data; } /* * we should still have the output to wr->data and the input from * wr->input. Length should be wr->length. wr->data still points in the * wb->buf */ if (mac_size != 0) { s->method->ssl3_enc->mac(s, &(p[wr->length + bs]), 1); wr->length += mac_size; } /* this is true regardless of mac size */ wr->input = p; wr->data = p; /* ssl3_enc can only have an error on read */ if (bs) { /* bs != 0 in case of CBC */ RAND_pseudo_bytes(p, bs); /* * master IV and last CBC residue stand for the rest of randomness */ wr->length += bs; } s->method->ssl3_enc->enc(s, 1); /* record length after mac and block padding */ /* * if (type == SSL3_RT_APPLICATION_DATA || (type == SSL3_RT_ALERT && ! * SSL_in_init(s))) */ /* there's only one epoch between handshake and app data */ s2n(s->d1->w_epoch, pseq); /* XDTLS: ?? */ /* * else s2n(s->d1->handshake_epoch, pseq); */ memcpy(pseq, &(s->s3->write_sequence[2]), 6); pseq += 6; s2n(wr->length, pseq); /* * we should now have wr->data pointing to the encrypted data, which is * wr->length long */ wr->type = type; /* not needed but helps for debugging */ wr->length += DTLS1_RT_HEADER_LENGTH; #if 0 /* this is now done at the message layer */ /* buffer the record, making it easy to handle retransmits */ if (type == SSL3_RT_HANDSHAKE || type == SSL3_RT_CHANGE_CIPHER_SPEC) dtls1_buffer_record(s, wr->data, wr->length, *((PQ_64BIT *) & (s->s3->write_sequence[0]))); #endif ssl3_record_sequence_update(&(s->s3->write_sequence[0])); if (create_empty_fragment) { /* * we are in a recursive call; just return the length, don't write * out anything here */ return wr->length; } /* now let's set up wb */ wb->left = prefix_len + wr->length; wb->offset = 0; /* * memorize arguments so that ssl3_write_pending can detect bad write * retries later */ s->s3->wpend_tot = len; s->s3->wpend_buf = buf; s->s3->wpend_type = type; s->s3->wpend_ret = len; /* we now just need to write the buffer */ return ssl3_write_pending(s, type, buf, len); err: return -1; } static int dtls1_record_replay_check(SSL *s, DTLS1_BITMAP *bitmap) { #if PQ_64BIT_IS_INTEGER PQ_64BIT mask = 0x0000000000000001L; #endif PQ_64BIT rcd_num, tmp; pq_64bit_init(&rcd_num); pq_64bit_init(&tmp); /* this is the sequence number for the record just read */ pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) { pq_64bit_assign(&s->s3->rrec.seq_num, &rcd_num); pq_64bit_free(&rcd_num); pq_64bit_free(&tmp); return 1; /* this record is new */ } pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); if (pq_64bit_get_word(&tmp) > bitmap->length) { pq_64bit_free(&rcd_num); pq_64bit_free(&tmp); return 0; /* stale, outside the window */ } #if PQ_64BIT_IS_BIGNUM { int offset; pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); pq_64bit_sub_word(&tmp, 1); offset = pq_64bit_get_word(&tmp); if (pq_64bit_is_bit_set(&(bitmap->map), offset)) { pq_64bit_free(&rcd_num); pq_64bit_free(&tmp); return 0; } } #else mask <<= (bitmap->max_seq_num - rcd_num - 1); if (bitmap->map & mask) return 0; /* record previously received */ #endif pq_64bit_assign(&s->s3->rrec.seq_num, &rcd_num); pq_64bit_free(&rcd_num); pq_64bit_free(&tmp); return 1; } static void dtls1_record_bitmap_update(SSL *s, DTLS1_BITMAP *bitmap) { unsigned int shift; PQ_64BIT rcd_num; PQ_64BIT tmp; PQ_64BIT_CTX *ctx; pq_64bit_init(&rcd_num); pq_64bit_init(&tmp); pq_64bit_bin2num(&rcd_num, s->s3->read_sequence, 8); /* * unfortunate code complexity due to 64-bit manipulation support on * 32-bit machines */ if (pq_64bit_gt(&rcd_num, &(bitmap->max_seq_num)) || pq_64bit_eq(&rcd_num, &(bitmap->max_seq_num))) { pq_64bit_sub(&tmp, &rcd_num, &(bitmap->max_seq_num)); pq_64bit_add_word(&tmp, 1); shift = (unsigned int)pq_64bit_get_word(&tmp); pq_64bit_lshift(&(tmp), &(bitmap->map), shift); pq_64bit_assign(&(bitmap->map), &tmp); pq_64bit_set_bit(&(bitmap->map), 0); pq_64bit_add_word(&rcd_num, 1); pq_64bit_assign(&(bitmap->max_seq_num), &rcd_num); pq_64bit_assign_word(&tmp, 1); pq_64bit_lshift(&tmp, &tmp, bitmap->length); ctx = pq_64bit_ctx_new(&ctx); pq_64bit_mod(&(bitmap->map), &(bitmap->map), &tmp, ctx); pq_64bit_ctx_free(ctx); } else { pq_64bit_sub(&tmp, &(bitmap->max_seq_num), &rcd_num); pq_64bit_sub_word(&tmp, 1); shift = (unsigned int)pq_64bit_get_word(&tmp); pq_64bit_set_bit(&(bitmap->map), shift); } pq_64bit_free(&rcd_num); pq_64bit_free(&tmp); } int dtls1_dispatch_alert(SSL *s) { int i, j; void (*cb) (const SSL *ssl, int type, int val) = NULL; unsigned char buf[DTLS1_AL_HEADER_LENGTH]; unsigned char *ptr = &buf[0]; s->s3->alert_dispatch = 0; memset(buf, 0x00, sizeof(buf)); *ptr++ = s->s3->send_alert[0]; *ptr++ = s->s3->send_alert[1]; #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE if (s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE) { s2n(s->d1->handshake_read_seq, ptr); # if 0 if (s->d1->r_msg_hdr.frag_off == 0) /* * waiting for a new msg */ else s2n(s->d1->r_msg_hdr.seq, ptr); /* partial msg read */ # endif # if 0 fprintf(stderr, "s->d1->handshake_read_seq = %d, s->d1->r_msg_hdr.seq = %d\n", s->d1->handshake_read_seq, s->d1->r_msg_hdr.seq); # endif l2n3(s->d1->r_msg_hdr.frag_off, ptr); } #endif i = do_dtls1_write(s, SSL3_RT_ALERT, &buf[0], sizeof(buf), 0); if (i <= 0) { s->s3->alert_dispatch = 1; /* fprintf( stderr, "not done with alert\n" ); */ } else { if (s->s3->send_alert[0] == SSL3_AL_FATAL #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE || s->s3->send_alert[1] == DTLS1_AD_MISSING_HANDSHAKE_MESSAGE #endif ) (void)BIO_flush(s->wbio); if (s->msg_callback) s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, 2, s, s->msg_callback_arg); if (s->info_callback != NULL) cb = s->info_callback; else if (s->ctx->info_callback != NULL) cb = s->ctx->info_callback; if (cb != NULL) { j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1]; cb(s, SSL_CB_WRITE_ALERT, j); } } return (i); } static DTLS1_BITMAP *dtls1_get_bitmap(SSL *s, SSL3_RECORD *rr, unsigned int *is_next_epoch) { *is_next_epoch = 0; /* In current epoch, accept HM, CCS, DATA, & ALERT */ if (rr->epoch == s->d1->r_epoch) return &s->d1->bitmap; /* * Only HM and ALERT messages can be from the next epoch and only if we * have already processed all of the unprocessed records from the last * epoch */ else if (rr->epoch == (unsigned long)(s->d1->r_epoch + 1) && s->d1->unprocessed_rcds.epoch != s->d1->r_epoch && (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_ALERT)) { *is_next_epoch = 1; return &s->d1->next_bitmap; } return NULL; } #if 0 static int dtls1_record_needs_buffering(SSL *s, SSL3_RECORD *rr, unsigned short *priority, unsigned long *offset) { /* alerts are passed up immediately */ if (rr->type == SSL3_RT_APPLICATION_DATA || rr->type == SSL3_RT_ALERT) return 0; /* * Only need to buffer if a handshake is underway. (this implies that * Hello Request and Client Hello are passed up immediately) */ if (SSL_in_init(s)) { unsigned char *data = rr->data; /* need to extract the HM/CCS sequence number here */ if (rr->type == SSL3_RT_HANDSHAKE || rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { unsigned short seq_num; struct hm_header_st msg_hdr; struct ccs_header_st ccs_hdr; if (rr->type == SSL3_RT_HANDSHAKE) { dtls1_get_message_header(data, &msg_hdr); seq_num = msg_hdr.seq; *offset = msg_hdr.frag_off; } else { dtls1_get_ccs_header(data, &ccs_hdr); seq_num = ccs_hdr.seq; *offset = 0; } /* * this is either a record we're waiting for, or a retransmit of * something we happened to previously receive (higher layers * will drop the repeat silently */ if (seq_num < s->d1->handshake_read_seq) return 0; if (rr->type == SSL3_RT_HANDSHAKE && seq_num == s->d1->handshake_read_seq && msg_hdr.frag_off < s->d1->r_msg_hdr.frag_off) return 0; else if (seq_num == s->d1->handshake_read_seq && (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC || msg_hdr.frag_off == s->d1->r_msg_hdr.frag_off)) return 0; else { *priority = seq_num; return 1; } } else /* unknown record type */ return 0; } return 0; } #endif void dtls1_reset_seq_numbers(SSL *s, int rw) { unsigned char *seq; unsigned int seq_bytes = sizeof(s->s3->read_sequence); if (rw & SSL3_CC_READ) { seq = s->s3->read_sequence; s->d1->r_epoch++; pq_64bit_assign(&(s->d1->bitmap.map), &(s->d1->next_bitmap.map)); s->d1->bitmap.length = s->d1->next_bitmap.length; pq_64bit_assign(&(s->d1->bitmap.max_seq_num), &(s->d1->next_bitmap.max_seq_num)); pq_64bit_free(&(s->d1->next_bitmap.map)); pq_64bit_free(&(s->d1->next_bitmap.max_seq_num)); memset(&(s->d1->next_bitmap), 0x00, sizeof(DTLS1_BITMAP)); pq_64bit_init(&(s->d1->next_bitmap.map)); pq_64bit_init(&(s->d1->next_bitmap.max_seq_num)); /* * We must not use any buffered messages received from the previous * epoch */ dtls1_clear_received_buffer(s); } else { seq = s->s3->write_sequence; memcpy(s->d1->last_write_sequence, seq, sizeof(s->s3->write_sequence)); s->d1->w_epoch++; } memset(seq, 0x00, seq_bytes); } #if PQ_64BIT_IS_INTEGER static PQ_64BIT bytes_to_long_long(unsigned char *bytes, PQ_64BIT * num) { PQ_64BIT _num; _num = (((PQ_64BIT) bytes[0]) << 56) | (((PQ_64BIT) bytes[1]) << 48) | (((PQ_64BIT) bytes[2]) << 40) | (((PQ_64BIT) bytes[3]) << 32) | (((PQ_64BIT) bytes[4]) << 24) | (((PQ_64BIT) bytes[5]) << 16) | (((PQ_64BIT) bytes[6]) << 8) | (((PQ_64BIT) bytes[7])); *num = _num; return _num; } #endif