diff options
Diffstat (limited to 'crypto/openssl/ssl/d1_both.c')
-rw-r--r-- | crypto/openssl/ssl/d1_both.c | 1191 |
1 files changed, 0 insertions, 1191 deletions
diff --git a/crypto/openssl/ssl/d1_both.c b/crypto/openssl/ssl/d1_both.c deleted file mode 100644 index 22bd28a..0000000 --- a/crypto/openssl/ssl/d1_both.c +++ /dev/null @@ -1,1191 +0,0 @@ -/* ssl/d1_both.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 <limits.h> -#include <string.h> -#include <stdio.h> -#include "ssl_locl.h" -#include <openssl/buffer.h> -#include <openssl/rand.h> -#include <openssl/objects.h> -#include <openssl/evp.h> -#include <openssl/x509.h> - - -/* 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 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) */ -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 && s->client_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; - 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. - */ -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); - if (s->client_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, 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,(int)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, 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; - } - - -static int -dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok) -{ - int i=-1; - hm_fragment *frag = NULL; - pitem *item = NULL; - PQ_64BIT seq64; - 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; - } - - pq_64bit_init(&seq64); - pq_64bit_assign_word(&seq64, msg_hdr->seq); - - item = pitem_new(seq64, frag); - pq_64bit_free(&seq64); - 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; - } - - -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, - &(s->s3->finish_dgst1), - &(s->s3->finish_dgst2), - 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 - */ -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; - - if (s->client_version == DTLS1_BAD_VER) - { - s2n(s->d1->handshake_write_seq,p); - s->init_num+=2; - } - - 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,(int)(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,(int)(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); - } - -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 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 - - return dtls1_retransmit_buffered_messages(s) ; - } - - -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; - } - -int -dtls1_buffer_message(SSL *s, int is_ccs) - { - pitem *item; - hm_fragment *frag; - PQ_64BIT seq64; - - /* 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; - - pq_64bit_init(&seq64); - pq_64bit_assign_word(&seq64, frag->msg_header.seq); - - item = pitem_new(seq64, frag); - pq_64bit_free(&seq64); - 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); -#endif - - 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; - PQ_64BIT seq64; - - /* - OPENSSL_assert(s->init_num == 0); - OPENSSL_assert(s->init_off == 0); - */ - - /* XDTLS: the requested message ought to be found, otherwise error */ - pq_64bit_init(&seq64); - pq_64bit_assign_word(&seq64, seq); - - item = pqueue_find(s->d1->sent_messages, seq64); - pq_64bit_free(&seq64); - 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; - } - -/* 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; - } - - -/* 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; - } - -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); - - s2n(msg_hdr->seq, p); - l2n3(msg_hdr->frag_off, p); - l2n3(msg_hdr->frag_len, p); - - return p; - } - -static unsigned int -dtls1_min_mtu(void) - { - return (g_probable_mtu[(sizeof(g_probable_mtu) / - sizeof(g_probable_mtu[0])) - 1]); - } - -static unsigned int -dtls1_guess_mtu(unsigned int curr_mtu) - { - size_t i; - - if ( curr_mtu == 0 ) - return g_probable_mtu[0] ; - - for ( i = 0; i < sizeof(g_probable_mtu)/sizeof(g_probable_mtu[0]); i++) - if ( curr_mtu > g_probable_mtu[i]) - return g_probable_mtu[i]; - - return curr_mtu; - } - -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); - - 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)); - - ccs_hdr->type = *(data++); - } |