diff options
Diffstat (limited to 'crypto/openssl/ssl/s2_pkt.c')
| -rw-r--r-- | crypto/openssl/ssl/s2_pkt.c | 168 |
1 files changed, 118 insertions, 50 deletions
diff --git a/crypto/openssl/ssl/s2_pkt.c b/crypto/openssl/ssl/s2_pkt.c index 7eb46732656c..4e752a25e161 100644 --- a/crypto/openssl/ssl/s2_pkt.c +++ b/crypto/openssl/ssl/s2_pkt.c @@ -54,6 +54,58 @@ * 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) 1998-2000 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). * * $FreeBSD$ */ @@ -68,23 +120,12 @@ static int read_n(SSL *s,unsigned int n,unsigned int max,unsigned int extend); static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len); static int write_pending(SSL *s, const unsigned char *buf, unsigned int len); static int ssl_mt_error(int n); -int ssl2_peek(SSL *s, char *buf, int len) - { - int ret; - ret=ssl2_read(s,buf,len); - if (ret > 0) - { - s->s2->ract_data_length+=ret; - s->s2->ract_data-=ret; - } - return(ret); - } -/* SSL_read - +/* SSL 2.0 imlementation for SSL_read/SSL_peek - * This routine will return 0 to len bytes, decrypted etc if required. */ -int ssl2_read(SSL *s, void *buf, int len) +static int ssl2_read_internal(SSL *s, void *buf, int len, int peek) { int n; unsigned char mac[MAX_MAC_SIZE]; @@ -92,14 +133,14 @@ int ssl2_read(SSL *s, void *buf, int len) int i; unsigned int mac_size=0; -ssl2_read_again: + ssl2_read_again: if (SSL_in_init(s) && !s->in_handshake) { n=s->handshake_func(s); if (n < 0) return(n); if (n == 0) { - SSLerr(SSL_F_SSL2_READ,SSL_R_SSL_HANDSHAKE_FAILURE); + SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_SSL_HANDSHAKE_FAILURE); return(-1); } } @@ -116,13 +157,22 @@ ssl2_read_again: n=len; memcpy(buf,s->s2->ract_data,(unsigned int)n); - s->s2->ract_data_length-=n; - s->s2->ract_data+=n; - if (s->s2->ract_data_length == 0) - s->rstate=SSL_ST_READ_HEADER; + if (!peek) + { + s->s2->ract_data_length-=n; + s->s2->ract_data+=n; + if (s->s2->ract_data_length == 0) + s->rstate=SSL_ST_READ_HEADER; + } + return(n); } + /* s->s2->ract_data_length == 0 + * + * Fill the buffer, then goto ssl2_read_again. + */ + if (s->rstate == SSL_ST_READ_HEADER) { if (s->first_packet) @@ -135,7 +185,7 @@ ssl2_read_again: (p[2] == SSL2_MT_CLIENT_HELLO) || (p[2] == SSL2_MT_SERVER_HELLO)))) { - SSLerr(SSL_F_SSL2_READ,SSL_R_NON_SSLV2_INITIAL_PACKET); + SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_NON_SSLV2_INITIAL_PACKET); return(-1); } } @@ -213,48 +263,49 @@ ssl2_read_again: (unsigned int)mac_size) != 0) || (s->s2->rlength%EVP_CIPHER_CTX_block_size(s->enc_read_ctx) != 0)) { - SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_MAC_DECODE); + SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_MAC_DECODE); return(-1); } } INC32(s->s2->read_sequence); /* expect next number */ /* s->s2->ract_data is now available for processing */ -#if 1 - /* How should we react when a packet containing 0 - * bytes is received? (Note that SSLeay/OpenSSL itself - * never sends such packets; see ssl2_write.) - * Returning 0 would be interpreted by the caller as - * indicating EOF, so it's not a good idea. - * Instead, we just continue reading. Note that using - * select() for blocking sockets *never* guarantees + /* Possibly the packet that we just read had 0 actual data bytes. + * (SSLeay/OpenSSL itself never sends such packets; see ssl2_write.) + * In this case, returning 0 would be interpreted by the caller + * as indicating EOF, so it's not a good idea. Instead, we just + * continue reading; thus ssl2_read_internal may have to process + * multiple packets before it can return. + * + * [Note that using select() for blocking sockets *never* guarantees * that the next SSL_read will not block -- the available - * data may contain incomplete packets, and except for SSL 2 - * renegotiation can confuse things even more. */ + * data may contain incomplete packets, and except for SSL 2, + * renegotiation can confuse things even more.] */ goto ssl2_read_again; /* This should really be - * "return ssl2_read(s,buf,len)", - * but that would allow for - * denial-of-service attacks if a - * C compiler is used that does not - * recognize end-recursion. */ -#else - /* If a 0 byte packet was sent, return 0, otherwise - * we play havoc with people using select with - * blocking sockets. Let them handle a packet at a time, - * they should really be using non-blocking sockets. */ - if (s->s2->ract_data_length == 0) - return(0); - return(ssl2_read(s,buf,len)); -#endif + * "return ssl2_read(s,buf,len)", + * but that would allow for + * denial-of-service attacks if a + * C compiler is used that does not + * recognize end-recursion. */ } else { - SSLerr(SSL_F_SSL2_READ,SSL_R_BAD_STATE); + SSLerr(SSL_F_SSL2_READ_INTERNAL,SSL_R_BAD_STATE); return(-1); } } +int ssl2_read(SSL *s, void *buf, int len) + { + return ssl2_read_internal(s, buf, len, 0); + } + +int ssl2_peek(SSL *s, char *buf, int len) + { + return ssl2_read_internal(s, buf, len, 1); + } + static int read_n(SSL *s, unsigned int n, unsigned int max, unsigned int extend) { @@ -485,6 +536,9 @@ static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) { bs=EVP_CIPHER_CTX_block_size(s->enc_read_ctx); j=len+mac_size; + /* Two-byte headers allow for a larger record length than + * three-byte headers, but we can't use them if we need + * padding or if we have to set the escape bit. */ if ((j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) && (!s->s2->escape)) { @@ -500,25 +554,39 @@ static int do_ssl_write(SSL *s, const unsigned char *buf, unsigned int len) } else if ((bs <= 1) && (!s->s2->escape)) { - /* len=len; */ + /* j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, thus + * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER */ s->s2->three_byte_header=0; p=0; } - else /* 3 byte header */ + else /* we may have to use a 3 byte header */ { - /*len=len; */ + /* If s->s2->escape is not set, then + * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER, and thus + * j < SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER. */ p=(j%bs); p=(p == 0)?0:(bs-p); if (s->s2->escape) + { s->s2->three_byte_header=1; + if (j > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) + j=SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER; + } else s->s2->three_byte_header=(p == 0)?0:1; } } + + /* Now + * j <= SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + * holds, and if s->s2->three_byte_header is set, then even + * j <= SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER. + */ + /* mac_size is the number of MAC bytes * len is the number of data bytes we are going to send * p is the number of padding bytes - * if p == 0, it is a 2 byte header */ + * (if it is a two-byte header, then p == 0) */ s->s2->wlength=len; s->s2->padding=p; |