initial commit

1 files changed, 1766 insertions, 0 deletions

diff --git a/openssl/ssl/s3_pkt.c b/openssl/ssl/s3_pkt.c
new file mode 100644
index 0000000..6ece87d
--- /dev/null
+++ b/openssl/ssl/s3_pkt.c
@@ -0,0 +1,1766 @@
+/* ssl/s3_pkt.c */
+/* 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.]
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2002 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).
+ *
+ */
+
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+#define USE_SOCKETS
+#include "ssl_locl.h"
+#include <openssl/evp.h>
+#include <openssl/buffer.h>
+#include <openssl/rand.h>
+
+#ifndef  EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
+#endif
+
+#if     defined(OPENSSL_SMALL_FOOTPRINT) || \
+        !(      defined(AES_ASM) &&     ( \
+                defined(__x86_64)       || defined(__x86_64__)  || \
+                defined(_M_AMD64)       || defined(_M_X64)      || \
+                defined(__INTEL__)      ) \
+        )
+# undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
+#endif
+
+static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
+                         unsigned int len, int create_empty_fragment);
+static int ssl3_get_record(SSL *s);
+
+/*
+ * Return values are as per SSL_read()
+ */
+int ssl3_read_n(SSL *s, int n, int max, int extend)
+{
+    /*
+     * If extend == 0, obtain new n-byte packet; if extend == 1, increase
+     * packet by another n bytes. The packet will be in the sub-array of
+     * s->s3->rbuf.buf specified by s->packet and s->packet_length. (If
+     * s->read_ahead is set, 'max' bytes may be stored in rbuf [plus
+     * s->packet_length bytes if extend == 1].)
+     */
+    int i, len, left;
+    long align = 0;
+    unsigned char *pkt;
+    SSL3_BUFFER *rb;
+
+    if (n <= 0)
+        return n;
+
+    rb = &(s->s3->rbuf);
+    if (rb->buf == NULL)
+        if (!ssl3_setup_read_buffer(s))
+            return -1;
+
+    left = rb->left;
+#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
+    align = (long)rb->buf + SSL3_RT_HEADER_LENGTH;
+    align = (-align) & (SSL3_ALIGN_PAYLOAD - 1);
+#endif
+
+    if (!extend) {
+        /* start with empty packet ... */
+        if (left == 0)
+            rb->offset = align;
+        else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH) {
+            /*
+             * check if next packet length is large enough to justify payload
+             * alignment...
+             */
+            pkt = rb->buf + rb->offset;
+            if (pkt[0] == SSL3_RT_APPLICATION_DATA
+                && (pkt[3] << 8 | pkt[4]) >= 128) {
+                /*
+                 * Note that even if packet is corrupted and its length field
+                 * is insane, we can only be led to wrong decision about
+                 * whether memmove will occur or not. Header values has no
+                 * effect on memmove arguments and therefore no buffer
+                 * overrun can be triggered.
+                 */
+                memmove(rb->buf + align, pkt, left);
+                rb->offset = align;
+            }
+        }
+        s->packet = rb->buf + rb->offset;
+        s->packet_length = 0;
+        /* ... now we can act as if 'extend' was set */
+    }
+
+    /*
+     * For DTLS/UDP reads should not span multiple packets because the read
+     * operation returns the whole packet at once (as long as it fits into
+     * the buffer).
+     */
+    if (SSL_IS_DTLS(s)) {
+        if (left == 0 && extend)
+            return 0;
+        if (left > 0 && n > left)
+            n = left;
+    }
+
+    /* if there is enough in the buffer from a previous read, take some */
+    if (left >= n) {
+        s->packet_length += n;
+        rb->left = left - n;
+        rb->offset += n;
+        return (n);
+    }
+
+    /* else we need to read more data */
+
+    len = s->packet_length;
+    pkt = rb->buf + align;
+    /*
+     * Move any available bytes to front of buffer: 'len' bytes already
+     * pointed to by 'packet', 'left' extra ones at the end
+     */
+    if (s->packet != pkt) {     /* len > 0 */
+        memmove(pkt, s->packet, len + left);
+        s->packet = pkt;
+        rb->offset = len + align;
+    }
+
+    if (n > (int)(rb->len - rb->offset)) { /* does not happen */
+        SSLerr(SSL_F_SSL3_READ_N, ERR_R_INTERNAL_ERROR);
+        return -1;
+    }
+
+    /* We always act like read_ahead is set for DTLS */
+    if (!s->read_ahead && !SSL_IS_DTLS(s))
+        /* ignore max parameter */
+        max = n;
+    else {
+        if (max < n)
+            max = n;
+        if (max > (int)(rb->len - rb->offset))
+            max = rb->len - rb->offset;
+    }
+
+    while (left < n) {
+        /*
+         * Now we have len+left bytes at the front of s->s3->rbuf.buf and
+         * need to read in more until we have len+n (up to len+max if
+         * possible)
+         */
+
+        clear_sys_error();
+        if (s->rbio != NULL) {
+            s->rwstate = SSL_READING;
+            i = BIO_read(s->rbio, pkt + len + left, max - left);
+        } else {
+            SSLerr(SSL_F_SSL3_READ_N, SSL_R_READ_BIO_NOT_SET);
+            i = -1;
+        }
+
+        if (i <= 0) {
+            rb->left = left;
+            if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s))
+                if (len + left == 0)
+                    ssl3_release_read_buffer(s);
+            return (i);
+        }
+        left += i;
+        /*
+         * reads should *never* span multiple packets for DTLS because the
+         * underlying transport protocol is message oriented as opposed to
+         * byte oriented as in the TLS case.
+         */
+        if (SSL_IS_DTLS(s)) {
+            if (n > left)
+                n = left;       /* makes the while condition false */
+        }
+    }
+
+    /* done reading, now the book-keeping */
+    rb->offset += n;
+    rb->left = left - n;
+    s->packet_length += n;
+    s->rwstate = SSL_NOTHING;
+    return (n);
+}
+
+/*
+ * MAX_EMPTY_RECORDS defines the number of consecutive, empty records that
+ * will be processed per call to ssl3_get_record. Without this limit an
+ * attacker could send empty records at a faster rate than we can process and
+ * cause ssl3_get_record to loop forever.
+ */
+#define MAX_EMPTY_RECORDS 32
+
+/*-
+ * Call this to get a new input record.
+ * It will return <= 0 if more data is needed, normally due to an error
+ * or non-blocking IO.
+ * 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 ssl3_read_bytes */
+static int ssl3_get_record(SSL *s)
+{
+    int ssl_major, ssl_minor, al;
+    int enc_err, n, i, ret = -1;
+    SSL3_RECORD *rr;
+    SSL_SESSION *sess;
+    unsigned char *p;
+    unsigned char md[EVP_MAX_MD_SIZE];
+    short version;
+    unsigned mac_size, orig_len;
+    size_t extra;
+    unsigned empty_record_count = 0;
+
+    rr = &(s->s3->rrec);
+    sess = s->session;
+
+    if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
+        extra = SSL3_RT_MAX_EXTRA;
+    else
+        extra = 0;
+    if (extra && !s->s3->init_extra) {
+        /*
+         * An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER set after
+         * ssl3_setup_buffers() was done
+         */
+        SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
+        return -1;
+    }
+
+ again:
+    /* check if we have the header */
+    if ((s->rstate != SSL_ST_READ_BODY) ||
+        (s->packet_length < SSL3_RT_HEADER_LENGTH)) {
+        n = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
+        if (n <= 0)
+            return (n);         /* error or non-blocking */
+        s->rstate = SSL_ST_READ_BODY;
+
+        p = s->packet;
+        if (s->msg_callback)
+            s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s,
+                            s->msg_callback_arg);
+
+        /* Pull apart the header into the SSL3_RECORD */
+        rr->type = *(p++);
+        ssl_major = *(p++);
+        ssl_minor = *(p++);
+        version = (ssl_major << 8) | ssl_minor;
+        n2s(p, rr->length);
+#if 0
+        fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
+#endif
+
+        /* Lets check version */
+        if (!s->first_packet) {
+            if (version != s->version) {
+                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);
+                if ((s->version & 0xFF00) == (version & 0xFF00)
+                    && !s->enc_write_ctx && !s->write_hash) {
+                    if (rr->type == SSL3_RT_ALERT) {
+                        /*
+                         * The record is using an incorrect version number, but
+                         * what we've got appears to be an alert. We haven't
+                         * read the body yet to check whether its a fatal or
+                         * not - but chances are it is. We probably shouldn't
+                         * send a fatal alert back. We'll just end.
+                         */
+                         goto err;
+                    }
+                    /*
+                     * Send back error using their minor version number :-)
+                     */
+                    s->version = (unsigned short)version;
+                }
+                al = SSL_AD_PROTOCOL_VERSION;
+                goto f_err;
+            }
+        }
+
+        if ((version >> 8) != SSL3_VERSION_MAJOR) {
+            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);
+            goto err;
+        }
+
+        if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH) {
+            al = SSL_AD_RECORD_OVERFLOW;
+            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);
+            goto f_err;
+        }
+
+        /* now s->rstate == SSL_ST_READ_BODY */
+    }
+
+    /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
+
+    if (rr->length > s->packet_length - SSL3_RT_HEADER_LENGTH) {
+        /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
+        i = rr->length;
+        n = ssl3_read_n(s, i, i, 1);
+        if (n <= 0)
+            return (n);         /* error or non-blocking io */
+        /*
+         * now n == rr->length, and s->packet_length == SSL3_RT_HEADER_LENGTH
+         * + rr->length
+         */
+    }
+
+    s->rstate = SSL_ST_READ_HEADER; /* set state for later operations */
+
+    /*
+     * 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[SSL3_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 + extra) {
+        al = SSL_AD_RECORD_OVERFLOW;
+        SSLerr(SSL_F_SSL3_GET_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) {
+        al = SSL_AD_DECRYPTION_FAILED;
+        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
+        goto f_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) && (EVP_MD_CTX_md(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_CTX_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_SSL3_GET_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 + extra + mac_size)
+            enc_err = -1;
+    }
+
+    if (enc_err < 0) {
+        /*
+         * A separate 'decryption_failed' alert was introduced with TLS 1.0,
+         * SSL 3.0 only has 'bad_record_mac'.  But unless a decryption
+         * failure is directly visible from the ciphertext anyway, we should
+         * not reveal which kind of error occured -- this might become
+         * visible to an attacker (e.g. via a logfile)
+         */
+        al = SSL_AD_BAD_RECORD_MAC;
+        SSLerr(SSL_F_SSL3_GET_RECORD,
+               SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
+        goto f_err;
+    }
+
+    /* r->length is now just compressed */
+    if (s->expand != NULL) {
+        if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + extra) {
+            al = SSL_AD_RECORD_OVERFLOW;
+            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG);
+            goto f_err;
+        }
+        if (!ssl3_do_uncompress(s)) {
+            al = SSL_AD_DECOMPRESSION_FAILURE;
+            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION);
+            goto f_err;
+        }
+    }
+
+    if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH + extra) {
+        al = SSL_AD_RECORD_OVERFLOW;
+        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG);
+        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;
+
+    /* just read a 0 length packet */
+    if (rr->length == 0) {
+        empty_record_count++;
+        if (empty_record_count > MAX_EMPTY_RECORDS) {
+            al = SSL_AD_UNEXPECTED_MESSAGE;
+            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_RECORD_TOO_SMALL);
+            goto f_err;
+        }
+        goto again;
+    }
+#if 0
+    fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type,
+            rr->length);
+#endif
+
+    return (1);
+
+ f_err:
+    ssl3_send_alert(s, SSL3_AL_FATAL, al);
+ err:
+    return (ret);
+}
+
+int ssl3_do_uncompress(SSL *ssl)
+{
+#ifndef OPENSSL_NO_COMP
+    int i;
+    SSL3_RECORD *rr;
+
+    rr = &(ssl->s3->rrec);
+    i = COMP_expand_block(ssl->expand, rr->comp,
+                          SSL3_RT_MAX_PLAIN_LENGTH, rr->data,
+                          (int)rr->length);
+    if (i < 0)
+        return (0);
+    else
+        rr->length = i;
+    rr->data = rr->comp;
+#endif
+    return (1);
+}
+
+int ssl3_do_compress(SSL *ssl)
+{
+#ifndef OPENSSL_NO_COMP
+    int i;
+    SSL3_RECORD *wr;
+
+    wr = &(ssl->s3->wrec);
+    i = COMP_compress_block(ssl->compress, wr->data,
+                            SSL3_RT_MAX_COMPRESSED_LENGTH,
+                            wr->input, (int)wr->length);
+    if (i < 0)
+        return (0);
+    else
+        wr->length = i;
+
+    wr->input = wr->data;
+#endif
+    return (1);
+}
+
+/*
+ * 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 ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
+{
+    const unsigned char *buf = buf_;
+    int tot;
+    unsigned int n, nw;
+#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+    unsigned int max_send_fragment;
+#endif
+    SSL3_BUFFER *wb = &(s->s3->wbuf);
+    int i;
+
+    s->rwstate = SSL_NOTHING;
+    OPENSSL_assert(s->s3->wnum <= INT_MAX);
+    tot = s->s3->wnum;
+    s->s3->wnum = 0;
+
+    if (SSL_in_init(s) && !s->in_handshake) {
+        i = s->handshake_func(s);
+        if (i < 0)
+            return (i);
+        if (i == 0) {
+            SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE);
+            return -1;
+        }
+    }
+
+    /*
+     * ensure that if we end up with a smaller value of data to write out
+     * than the the original len from a write which didn't complete for
+     * non-blocking I/O and also somehow ended up avoiding the check for
+     * this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be
+     * possible to end up with (len-tot) as a large number that will then
+     * promptly send beyond the end of the users buffer ... so we trap and
+     * report the error in a way the user will notice
+     */
+    if (len < tot) {
+        SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH);
+        return (-1);
+    }
+
+    /*
+     * first check if there is a SSL3_BUFFER still being written out.  This
+     * will happen with non blocking IO
+     */
+    if (wb->left != 0) {
+        i = ssl3_write_pending(s, type, &buf[tot], s->s3->wpend_tot);
+        if (i <= 0) {
+            /* XXX should we ssl3_release_write_buffer if i<0? */
+            s->s3->wnum = tot;
+            return i;
+        }
+        tot += i;               /* this might be last fragment */
+    }
+#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
+    /*
+     * Depending on platform multi-block can deliver several *times*
+     * better performance. Downside is that it has to allocate
+     * jumbo buffer to accomodate up to 8 records, but the
+     * compromise is considered worthy.
+     */
+    if (type == SSL3_RT_APPLICATION_DATA &&
+        len >= 4 * (int)(max_send_fragment = s->max_send_fragment) &&
+        s->compress == NULL && s->msg_callback == NULL &&
+        SSL_USE_EXPLICIT_IV(s) &&
+        EVP_CIPHER_flags(s->enc_write_ctx->cipher) &
+        EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) {
+        unsigned char aad[13];
+        EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;
+        int packlen;
+
+        /* minimize address aliasing conflicts */
+        if ((max_send_fragment & 0xfff) == 0)
+            max_send_fragment -= 512;
+
+        if (tot == 0 || wb->buf == NULL) { /* allocate jumbo buffer */
+            ssl3_release_write_buffer(s);
+
+            packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+                                          EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE,
+                                          max_send_fragment, NULL);
+
+            if (len >= 8 * (int)max_send_fragment)
+                packlen *= 8;
+            else
+                packlen *= 4;
+
+            wb->buf = OPENSSL_malloc(packlen);
+            if (!wb->buf) {
+                SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_MALLOC_FAILURE);
+                return -1;
+            }
+            wb->len = packlen;
+        } else if (tot == len) { /* done? */
+            OPENSSL_free(wb->buf); /* free jumbo buffer */
+            wb->buf = NULL;
+            return tot;
+        }
+
+        n = (len - tot);
+        for (;;) {
+            if (n < 4 * max_send_fragment) {
+                OPENSSL_free(wb->buf); /* free jumbo buffer */
+                wb->buf = NULL;
+                break;
+            }
+
+            if (s->s3->alert_dispatch) {
+                i = s->method->ssl_dispatch_alert(s);
+                if (i <= 0) {
+                    s->s3->wnum = tot;
+                    return i;
+                }
+            }
+
+            if (n >= 8 * max_send_fragment)
+                nw = max_send_fragment * (mb_param.interleave = 8);
+            else
+                nw = max_send_fragment * (mb_param.interleave = 4);
+
+            memcpy(aad, s->s3->write_sequence, 8);
+            aad[8] = type;
+            aad[9] = (unsigned char)(s->version >> 8);
+            aad[10] = (unsigned char)(s->version);
+            aad[11] = 0;
+            aad[12] = 0;
+            mb_param.out = NULL;
+            mb_param.inp = aad;
+            mb_param.len = nw;
+
+            packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+                                          EVP_CTRL_TLS1_1_MULTIBLOCK_AAD,
+                                          sizeof(mb_param), &mb_param);
+
+            if (packlen <= 0 || packlen > (int)wb->len) { /* never happens */
+                OPENSSL_free(wb->buf); /* free jumbo buffer */
+                wb->buf = NULL;
+                break;
+            }
+
+            mb_param.out = wb->buf;
+            mb_param.inp = &buf[tot];
+            mb_param.len = nw;
+
+            if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx,
+                                    EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT,
+                                    sizeof(mb_param), &mb_param) <= 0)
+                return -1;
+
+            s->s3->write_sequence[7] += mb_param.interleave;
+            if (s->s3->write_sequence[7] < mb_param.interleave) {
+                int j = 6;
+                while (j >= 0 && (++s->s3->write_sequence[j--]) == 0) ;
+            }
+
+            wb->offset = 0;
+            wb->left = packlen;
+
+            s->s3->wpend_tot = nw;
+            s->s3->wpend_buf = &buf[tot];
+            s->s3->wpend_type = type;
+            s->s3->wpend_ret = nw;
+
+            i = ssl3_write_pending(s, type, &buf[tot], nw);
+            if (i <= 0) {
+                if (i < 0 && (!s->wbio || !BIO_should_retry(s->wbio))) {
+                    OPENSSL_free(wb->buf);
+                    wb->buf = NULL;
+                }
+                s->s3->wnum = tot;
+                return i;
+            }
+            if (i == (int)n) {
+                OPENSSL_free(wb->buf); /* free jumbo buffer */
+                wb->buf = NULL;
+                return tot + i;
+            }
+            n -= i;
+            tot += i;
+        }
+    } else
+#endif
+    if (tot == len) {           /* done? */
+        if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s))
+            ssl3_release_write_buffer(s);
+
+        return tot;
+    }
+
+    n = (len - tot);
+    for (;;) {
+        if (n > s->max_send_fragment)
+            nw = s->max_send_fragment;
+        else
+            nw = n;
+
+        i = do_ssl3_write(s, type, &(buf[tot]), nw, 0);
+        if (i <= 0) {
+            /* XXX should we ssl3_release_write_buffer if i<0? */
+            s->s3->wnum = tot;
+            return i;
+        }
+
+        if ((i == (int)n) ||
+            (type == SSL3_RT_APPLICATION_DATA &&
+             (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) {
+            /*
+             * next chunk of data should get another prepended empty fragment
+             * in ciphersuites with known-IV weakness:
+             */
+            s->s3->empty_fragment_done = 0;
+
+            if ((i == (int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS &&
+                !SSL_IS_DTLS(s))
+                ssl3_release_write_buffer(s);
+
+            return tot + i;
+        }
+
+        n -= i;
+        tot += i;
+    }
+}
+
+static int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
+                         unsigned int len, int create_empty_fragment)
+{
+    unsigned char *p, *plen;
+    int i, mac_size, clear = 0;
+    int prefix_len = 0;
+    int eivlen;
+    long align = 0;
+    SSL3_RECORD *wr;
+    SSL3_BUFFER *wb = &(s->s3->wbuf);
+    SSL_SESSION *sess;
+
+    /*
+     * first check if there is a SSL3_BUFFER still being written out.  This
+     * will happen with non blocking IO
+     */
+    if (wb->left != 0)
+        return (ssl3_write_pending(s, type, buf, len));
+
+    /* If we have an alert to send, lets send it */
+    if (s->s3->alert_dispatch) {
+        i = s->method->ssl_dispatch_alert(s);
+        if (i <= 0)
+            return (i);
+        /* if it went, fall through and send more stuff */
+    }
+
+    if (wb->buf == NULL)
+        if (!ssl3_setup_write_buffer(s))
+            return -1;
+
+    if (len == 0 && !create_empty_fragment)
+        return 0;
+
+    wr = &(s->s3->wrec);
+    sess = s->session;
+
+    if ((sess == NULL) ||
+        (s->enc_write_ctx == NULL) ||
+        (EVP_MD_CTX_md(s->write_hash) == NULL)) {
+#if 1
+        clear = s->enc_write_ctx ? 0 : 1; /* must be AEAD cipher */
+#else
+        clear = 1;
+#endif
+        mac_size = 0;
+    } else {
+        mac_size = EVP_MD_CTX_size(s->write_hash);
+        if (mac_size < 0)
+            goto err;
+    }
+
+    /*
+     * 'create_empty_fragment' is true only when this function calls itself
+     */
+    if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) {
+        /*
+         * 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 = do_ssl3_write(s, type, buf, 0, 1);
+            if (prefix_len <= 0)
+                goto err;
+
+            if (prefix_len >
+                (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD))
+            {
+                /* insufficient space */
+                SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR);
+                goto err;
+            }
+        }
+
+        s->s3->empty_fragment_done = 1;
+    }
+
+    if (create_empty_fragment) {
+#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
+        /*
+         * extra fragment would be couple of cipher blocks, which would be
+         * multiple of SSL3_ALIGN_PAYLOAD, so if we want to align the real
+         * payload, then we can just pretent we simply have two headers.
+         */
+        align = (long)wb->buf + 2 * SSL3_RT_HEADER_LENGTH;
+        align = (-align) & (SSL3_ALIGN_PAYLOAD - 1);
+#endif
+        p = wb->buf + align;
+        wb->offset = align;
+    } else if (prefix_len) {
+        p = wb->buf + wb->offset + prefix_len;
+    } else {
+#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
+        align = (long)wb->buf + SSL3_RT_HEADER_LENGTH;
+        align = (-align) & (SSL3_ALIGN_PAYLOAD - 1);
+#endif
+        p = wb->buf + align;
+        wb->offset = align;
+    }
+
+    /* write the header */
+
+    *(p++) = type & 0xff;
+    wr->type = type;
+
+    *(p++) = (s->version >> 8);
+    /*
+     * Some servers hang if iniatial client hello is larger than 256 bytes
+     * and record version number > TLS 1.0
+     */
+    if (s->state == SSL3_ST_CW_CLNT_HELLO_B
+        && !s->renegotiate && TLS1_get_version(s) > TLS1_VERSION)
+        *(p++) = 0x1;
+    else
+        *(p++) = s->version & 0xff;
+
+    /* field where we are to write out packet length */
+    plen = p;
+    p += 2;
+    /* Explicit IV length, block ciphers appropriate version flag */
+    if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s)) {
+        int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx);
+        if (mode == EVP_CIPH_CBC_MODE) {
+            eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx);
+            if (eivlen <= 1)
+                eivlen = 0;
+        }
+        /* Need explicit part of IV for GCM mode */
+        else if (mode == EVP_CIPH_GCM_MODE)
+            eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN;
+        else
+            eivlen = 0;
+    } else
+        eivlen = 0;
+
+    /* lets setup the record stuff. */
+    wr->data = p + eivlen;
+    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_SSL3_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) {
+        if (s->method->ssl3_enc->mac(s, &(p[wr->length + eivlen]), 1) < 0)
+            goto err;
+        wr->length += mac_size;
+    }
+
+    wr->input = p;
+    wr->data = p;
+
+    if (eivlen) {
+        /*
+         * if (RAND_pseudo_bytes(p, eivlen) <= 0) goto err;
+         */
+        wr->length += eivlen;
+    }
+
+    if (s->method->ssl3_enc->enc(s, 1) < 1)
+        goto err;
+
+    /* record length after mac and block padding */
+    s2n(wr->length, plen);
+
+    if (s->msg_callback)
+        s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s,
+                        s->msg_callback_arg);
+
+    /*
+     * we should now have wr->data pointing to the encrypted data, which is
+     * wr->length long
+     */
+    wr->type = type;            /* not needed but helps for debugging */
+    wr->length += SSL3_RT_HEADER_LENGTH;
+
+    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;
+
+    /*
+     * 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;
+}
+
+/* if s->s3->wbuf.left != 0, we need to call this
+ *
+ * Return values are as per SSL_write(), i.e.
+ */
+int ssl3_write_pending(SSL *s, int type, const unsigned char *buf,
+                       unsigned int len)
+{
+    int i;
+    SSL3_BUFFER *wb = &(s->s3->wbuf);
+
+/* XXXX */
+    if ((s->s3->wpend_tot > (int)len)
+        || ((s->s3->wpend_buf != buf) &&
+            !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER))
+        || (s->s3->wpend_type != type)) {
+        SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY);
+        return (-1);
+    }
+
+    for (;;) {
+        clear_sys_error();
+        if (s->wbio != NULL) {
+            s->rwstate = SSL_WRITING;
+            i = BIO_write(s->wbio,
+                          (char *)&(wb->buf[wb->offset]),
+                          (unsigned int)wb->left);
+        } else {
+            SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BIO_NOT_SET);
+            i = -1;
+        }
+        if (i == wb->left) {
+            wb->left = 0;
+            wb->offset += i;
+            s->rwstate = SSL_NOTHING;
+            return (s->s3->wpend_ret);
+        } else if (i <= 0) {
+            if (SSL_IS_DTLS(s)) {
+                /*
+                 * For DTLS, just drop it. That's kind of the whole point in
+                 * using a datagram service
+                 */
+                wb->left = 0;
+            }
+            return i;
+        }
+        wb->offset += i;
+        wb->left -= i;
+    }
+}
+
+/*-
+ * 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 ssl3_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_read_buffer(s))
+            return (-1);
+
+    if ((type && (type != SSL3_RT_APPLICATION_DATA)
+         && (type != SSL3_RT_HANDSHAKE)) || (peek
+                                             && (type !=
+                                                 SSL3_RT_APPLICATION_DATA))) {
+        SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR);
+        return -1;
+    }
+
+    if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0))
+        /* (partially) satisfy request from storage */
+    {
+        unsigned char *src = s->s3->handshake_fragment;
+        unsigned char *dst = buf;
+        unsigned int k;
+
+        /* peek == 0 */
+        n = 0;
+        while ((len > 0) && (s->s3->handshake_fragment_len > 0)) {
+            *dst++ = *src++;
+            len--;
+            s->s3->handshake_fragment_len--;
+            n++;
+        }
+        /* move any remaining fragment bytes: */
+        for (k = 0; k < s->s3->handshake_fragment_len; k++)
+            s->s3->handshake_fragment[k] = *src++;
+        return n;
+    }
+
+    /*
+     * Now s->s3->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_SSL3_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);
+
+    /* get new packet if necessary */
+    if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) {
+        ret = ssl3_get_record(s);
+        if (ret <= 0)
+            return (ret);
+    }
+
+    /*
+     * 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->cert->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)) {
+        al = SSL_AD_UNEXPECTED_MESSAGE;
+        SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED);
+        goto f_err;
+    }
+
+    /*
+     * 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_SSL3_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;
+                if (s->mode & SSL_MODE_RELEASE_BUFFERS
+                    && s->s3->rbuf.left == 0)
+                    ssl3_release_read_buffer(s);
+            }
+        }
+        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 dest_maxlen = 0;
+        unsigned char *dest = NULL;
+        unsigned int *dest_len = NULL;
+
+        if (rr->type == SSL3_RT_HANDSHAKE) {
+            dest_maxlen = sizeof s->s3->handshake_fragment;
+            dest = s->s3->handshake_fragment;
+            dest_len = &s->s3->handshake_fragment_len;
+        } else if (rr->type == SSL3_RT_ALERT) {
+            dest_maxlen = sizeof s->s3->alert_fragment;
+            dest = s->s3->alert_fragment;
+            dest_len = &s->s3->alert_fragment_len;
+        }
+#ifndef OPENSSL_NO_HEARTBEATS
+        else if (rr->type == TLS1_RT_HEARTBEAT) {
+            tls1_process_heartbeat(s);
+
+            /* Exit and notify application to read again */
+            rr->length = 0;
+            s->rwstate = SSL_READING;
+            BIO_clear_retry_flags(SSL_get_rbio(s));
+            BIO_set_retry_read(SSL_get_rbio(s));
+            return (-1);
+        }
+#endif
+
+        if (dest_maxlen > 0) {
+            n = dest_maxlen - *dest_len; /* available space in 'dest' */
+            if (rr->length < n)
+                n = rr->length; /* available bytes */
+
+            /* now move 'n' bytes: */
+            while (n-- > 0) {
+                dest[(*dest_len)++] = rr->data[rr->off++];
+                rr->length--;
+            }
+
+            if (*dest_len < dest_maxlen)
+                goto start;     /* fragment was too small */
+        }
+    }
+
+    /*-
+     * s->s3->handshake_fragment_len == 4  iff  rr->type == SSL3_RT_HANDSHAKE;
+     * s->s3->alert_fragment_len == 2      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->s3->handshake_fragment_len >= 4) &&
+        (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) &&
+        (s->session != NULL) && (s->session->cipher != NULL)) {
+        s->s3->handshake_fragment_len = 0;
+
+        if ((s->s3->handshake_fragment[1] != 0) ||
+            (s->s3->handshake_fragment[2] != 0) ||
+            (s->s3->handshake_fragment[3] != 0)) {
+            al = SSL_AD_DECODE_ERROR;
+            SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_HELLO_REQUEST);
+            goto f_err;
+        }
+
+        if (s->msg_callback)
+            s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
+                            s->s3->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) {
+            ssl3_renegotiate(s);
+            if (ssl3_renegotiate_check(s)) {
+                i = s->handshake_func(s);
+                if (i < 0)
+                    return (i);
+                if (i == 0) {
+                    SSLerr(SSL_F_SSL3_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 we are a server and get a client hello when renegotiation isn't
+     * allowed send back a no renegotiation alert and carry on. WARNING:
+     * experimental code, needs reviewing (steve)
+     */
+    if (s->server &&
+        SSL_is_init_finished(s) &&
+        !s->s3->send_connection_binding &&
+        (s->version > SSL3_VERSION) &&
+        (s->s3->handshake_fragment_len >= 4) &&
+        (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) &&
+        (s->session != NULL) && (s->session->cipher != NULL) &&
+        !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
+        /*
+         * s->s3->handshake_fragment_len = 0;
+         */
+        rr->length = 0;
+        ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION);
+        goto start;
+    }
+    if (s->s3->alert_fragment_len >= 2) {
+        int alert_level = s->s3->alert_fragment[0];
+        int alert_descr = s->s3->alert_fragment[1];
+
+        s->s3->alert_fragment_len = 0;
+
+        if (s->msg_callback)
+            s->msg_callback(0, s->version, SSL3_RT_ALERT,
+                            s->s3->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 == SSL3_AL_WARNING) {
+            s->s3->warn_alert = alert_descr;
+
+            s->cert->alert_count++;
+            if (s->cert->alert_count == MAX_WARN_ALERT_COUNT) {
+                al = SSL_AD_UNEXPECTED_MESSAGE;
+                SSLerr(SSL_F_SSL3_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);
+            }
+            /*
+             * This is a warning but we receive it if we requested
+             * renegotiation and the peer denied it. Terminate with a fatal
+             * alert because if application tried to renegotiatie it
+             * presumably had a good reason and expects it to succeed. In
+             * future we might have a renegotiation where we don't care if
+             * the peer refused it where we carry on.
+             */
+            else if (alert_descr == SSL_AD_NO_RENEGOTIATION) {
+                al = SSL_AD_HANDSHAKE_FAILURE;
+                SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_NO_RENEGOTIATION);
+                goto f_err;
+            }
+#ifdef SSL_AD_MISSING_SRP_USERNAME
+            else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME)
+                return (0);
+#endif
+        } else if (alert_level == SSL3_AL_FATAL) {
+            char tmp[16];
+
+            s->rwstate = SSL_NOTHING;
+            s->s3->fatal_alert = alert_descr;
+            SSLerr(SSL_F_SSL3_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->session_ctx, s->session);
+            return (0);
+        } else {
+            al = SSL_AD_ILLEGAL_PARAMETER;
+            SSLerr(SSL_F_SSL3_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) {
+        /*
+         * 'Change Cipher Spec' is just a single byte, so we know exactly
+         * what the record payload has to look like
+         */
+        if ((rr->length != 1) || (rr->off != 0) ||
+            (rr->data[0] != SSL3_MT_CCS)) {
+            al = SSL_AD_ILLEGAL_PARAMETER;
+            SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC);
+            goto f_err;
+        }
+
+        /* Check we have a cipher to change to */
+        if (s->s3->tmp.new_cipher == NULL) {
+            al = SSL_AD_UNEXPECTED_MESSAGE;
+            SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY);
+            goto f_err;
+        }
+
+        if (!(s->s3->flags & SSL3_FLAGS_CCS_OK)) {
+            al = SSL_AD_UNEXPECTED_MESSAGE;
+            SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY);
+            goto f_err;
+        }
+
+        s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
+
+        rr->length = 0;
+
+        if (s->msg_callback)
+            s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC,
+                            rr->data, 1, s, s->msg_callback_arg);
+
+        s->s3->change_cipher_spec = 1;
+        if (!ssl3_do_change_cipher_spec(s))
+            goto err;
+        else
+            goto start;
+    }
+
+    /*
+     * Unexpected handshake message (Client Hello, or protocol violation)
+     */
+    if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) {
+        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->renegotiate = 1;
+            s->new_session = 1;
+        }
+        i = s->handshake_func(s);
+        if (i < 0)
+            return (i);
+        if (i == 0) {
+            SSLerr(SSL_F_SSL3_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:
+        /*
+         * TLS 1.0 and 1.1 say you SHOULD ignore unrecognised record types, but
+         * TLS 1.2 says you MUST send an unexpected message alert. We use the
+         * TLS 1.2 behaviour for all protocol versions to prevent issues where
+         * no progress is being made and the peer continually sends unrecognised
+         * record types, using up resources processing them.
+         */
+        al = SSL_AD_UNEXPECTED_MESSAGE;
+        SSLerr(SSL_F_SSL3_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_SSL3_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_SSL3_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 ssl3_do_change_cipher_spec(SSL *s)
+{
+    int i;
+    const char *sender;
+    int slen;
+
+    if (s->state & SSL_ST_ACCEPT)
+        i = SSL3_CHANGE_CIPHER_SERVER_READ;
+    else
+        i = SSL3_CHANGE_CIPHER_CLIENT_READ;
+
+    if (s->s3->tmp.key_block == NULL) {
+        if (s->session == NULL || s->session->master_key_length == 0) {
+            /* might happen if dtls1_read_bytes() calls this */
+            SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC,
+                   SSL_R_CCS_RECEIVED_EARLY);
+            return (0);
+        }
+
+        s->session->cipher = s->s3->tmp.new_cipher;
+        if (!s->method->ssl3_enc->setup_key_block(s))
+            return (0);
+    }
+
+    if (!s->method->ssl3_enc->change_cipher_state(s, i))
+        return (0);
+
+    /*
+     * we have to record the message digest at this point so we can get it
+     * before we read the finished message
+     */
+    if (s->state & SSL_ST_CONNECT) {
+        sender = s->method->ssl3_enc->server_finished_label;
+        slen = s->method->ssl3_enc->server_finished_label_len;
+    } else {
+        sender = s->method->ssl3_enc->client_finished_label;
+        slen = s->method->ssl3_enc->client_finished_label_len;
+    }
+
+    i = s->method->ssl3_enc->final_finish_mac(s,
+                                              sender, slen,
+                                              s->s3->tmp.peer_finish_md);
+    if (i == 0) {
+        SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
+        return 0;
+    }
+    s->s3->tmp.peer_finish_md_len = i;
+
+    return (1);
+}
+
+int ssl3_send_alert(SSL *s, int level, int desc)
+{
+    /* Map tls/ssl alert value to correct one */
+    desc = s->method->ssl3_enc->alert_value(desc);
+    if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)
+        desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have
+                                          * protocol_version alerts */
+    if (desc < 0)
+        return -1;
+    /* If a fatal one, remove from cache */
+    if ((level == 2) && (s->session != NULL))
+        SSL_CTX_remove_session(s->session_ctx, s->session);
+
+    s->s3->alert_dispatch = 1;
+    s->s3->send_alert[0] = level;
+    s->s3->send_alert[1] = desc;
+    if (s->s3->wbuf.left == 0)  /* data still being written out? */
+        return s->method->ssl_dispatch_alert(s);
+    /*
+     * else data is still being written out, we will get written some time in
+     * the future
+     */
+    return -1;
+}
+
+int ssl3_dispatch_alert(SSL *s)
+{
+    int i, j;
+    void (*cb) (const SSL *ssl, int type, int val) = NULL;
+
+    s->s3->alert_dispatch = 0;
+    i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0);
+    if (i <= 0) {
+        s->s3->alert_dispatch = 1;
+    } else {
+        /*
+         * Alert sent to BIO.  If it is important, flush it now. If the
+         * message does not get sent due to non-blocking IO, we will not
+         * worry too much.
+         */
+        if (s->s3->send_alert[0] == SSL3_AL_FATAL)
+            (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);
+}