diff options
Diffstat (limited to 'openssl/ssl/s3_pkt.c')
| -rw-r--r-- | openssl/ssl/s3_pkt.c | 1325 |
1 files changed, 1325 insertions, 0 deletions
diff --git a/openssl/ssl/s3_pkt.c b/openssl/ssl/s3_pkt.c new file mode 100644 index 000000000..9476dcddf --- /dev/null +++ b/openssl/ssl/s3_pkt.c @@ -0,0 +1,1325 @@ +/* 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 <errno.h> +#define USE_SOCKETS +#include "ssl_locl.h" +#include <openssl/evp.h> +#include <openssl/buffer.h> + +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); + +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,off,newb; + + if (!extend) + { + /* start with empty packet ... */ + if (s->s3->rbuf.left == 0) + s->s3->rbuf.offset = 0; + s->packet = s->s3->rbuf.buf + s->s3->rbuf.offset; + s->packet_length = 0; + /* ... now we can act as if 'extend' was set */ + } + + /* extend reads should not span multiple packets for DTLS */ + if ( SSL_version(s) == DTLS1_VERSION && + extend) + { + if ( s->s3->rbuf.left > 0 && n > s->s3->rbuf.left) + n = s->s3->rbuf.left; + } + + /* if there is enough in the buffer from a previous read, take some */ + if (s->s3->rbuf.left >= (int)n) + { + s->packet_length+=n; + s->s3->rbuf.left-=n; + s->s3->rbuf.offset+=n; + return(n); + } + + /* else we need to read more data */ + if (!s->read_ahead) + max=n; + + { + /* avoid buffer overflow */ + int max_max = s->s3->rbuf.len - s->packet_length; + if (max > max_max) + max = max_max; + } + if (n > max) /* does not happen */ + { + SSLerr(SSL_F_SSL3_READ_N,ERR_R_INTERNAL_ERROR); + return -1; + } + + off = s->packet_length; + newb = s->s3->rbuf.left; + /* Move any available bytes to front of buffer: + * 'off' bytes already pointed to by 'packet', + * 'newb' extra ones at the end */ + if (s->packet != s->s3->rbuf.buf) + { + /* off > 0 */ + memmove(s->s3->rbuf.buf, s->packet, off+newb); + s->packet = s->s3->rbuf.buf; + } + + while (newb < n) + { + /* Now we have off+newb bytes at the front of s->s3->rbuf.buf and need + * to read in more until we have off+n (up to off+max if possible) */ + + clear_sys_error(); + if (s->rbio != NULL) + { + s->rwstate=SSL_READING; + i=BIO_read(s->rbio, &(s->s3->rbuf.buf[off+newb]), max-newb); + } + else + { + SSLerr(SSL_F_SSL3_READ_N,SSL_R_READ_BIO_NOT_SET); + i = -1; + } + + if (i <= 0) + { + s->s3->rbuf.left = newb; + return(i); + } + newb+=i; + } + + /* done reading, now the book-keeping */ + s->s3->rbuf.offset = off + n; + s->s3->rbuf.left = newb - n; + s->packet_length += n; + s->rwstate=SSL_NOTHING; + return(n); + } + +/* 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 int mac_size; + int clear=0; + size_t extra; + int decryption_failed_or_bad_record_mac = 0; + unsigned char *mac = NULL; + + 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->rbuf.len - SSL3_RT_MAX_PACKET_SIZE) + { + /* actually likely 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; + + /* 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); + + /* Lets check version */ + if (!s->first_packet) + { + if (version != s->version) + { + SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER); + /* Send back error using their + * version number :-) */ + s->version=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 > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra) + { + 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); + if (enc_err <= 0) + { + if (enc_err == 0) + /* SSLerr() and ssl3_send_alert() have been called */ + goto err; + + /* Otherwise enc_err == -1, which indicates bad padding + * (rec->length has not been changed in this case). + * To minimize information leaked via timing, we will perform + * the MAC computation anyway. */ + decryption_failed_or_bad_record_mac = 1; + } + +#ifdef TLS_DEBUG +printf("dec %d\n",rr->length); +{ unsigned int z; for (z=0; z<rr->length; z++) printf("%02X%c",rr->data[z],((z+1)%16)?' ':'\n'); } +printf("\n"); +#endif + + /* r->length is now the compressed data plus mac */ + if ( (sess == NULL) || + (s->enc_read_ctx == NULL) || + (s->read_hash == NULL)) + clear=1; + + if (!clear) + { + mac_size=EVP_MD_size(s->read_hash); + + if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH+extra+mac_size) + { +#if 0 /* OK only for stream ciphers (then rr->length is visible from ciphertext anyway) */ + al=SSL_AD_RECORD_OVERFLOW; + SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PRE_MAC_LENGTH_TOO_LONG); + goto f_err; +#else + decryption_failed_or_bad_record_mac = 1; +#endif + } + /* check the MAC for rr->input (it's in mac_size bytes at the tail) */ + if (rr->length >= mac_size) + { + rr->length -= mac_size; + mac = &rr->data[rr->length]; + } + else + { + /* record (minus padding) is too short to contain a MAC */ +#if 0 /* OK only for stream ciphers */ + al=SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT); + goto f_err; +#else + decryption_failed_or_bad_record_mac = 1; + rr->length = 0; +#endif + } + i=s->method->ssl3_enc->mac(s,md,0); + if (mac == NULL || memcmp(md, mac, mac_size) != 0) + { + decryption_failed_or_bad_record_mac = 1; + } + } + + if (decryption_failed_or_bad_record_mac) + { + /* 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) goto again; + + 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_; + unsigned int tot,n,nw; + int i; + + s->rwstate=SSL_NOTHING; + 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; + } + } + + n=(len-tot); + for (;;) + { + if (n > SSL3_RT_MAX_PLAIN_LENGTH) + nw=SSL3_RT_MAX_PLAIN_LENGTH; + else + nw=n; + + i=do_ssl3_write(s, type, &(buf[tot]), nw, 0); + 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; + + 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; + SSL3_RECORD *wr; + SSL3_BUFFER *wb; + SSL_SESSION *sess; + + /* first check if there is a SSL3_BUFFER still being written + * out. This will happen with non blocking IO */ + if (s->s3->wbuf.left != 0) + return(ssl3_write_pending(s,type,buf,len)); + + /* If we have an alert to send, lets send it */ + if (s->s3->alert_dispatch) + { + i=s->method->ssl_dispatch_alert(s); + if (i <= 0) + return(i); + /* if it went, fall through and send more stuff */ + } + + if (len == 0 && !create_empty_fragment) + return 0; + + wr= &(s->s3->wrec); + wb= &(s->s3->wbuf); + sess=s->session; + + if ( (sess == NULL) || + (s->enc_write_ctx == NULL) || + (s->write_hash == NULL)) + clear=1; + + if (clear) + mac_size=0; + else + mac_size=EVP_MD_size(s->write_hash); + + /* '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 (s->s3->wbuf.len < (size_t)prefix_len + SSL3_RT_MAX_PACKET_SIZE) + { + /* insufficient space */ + SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); + goto err; + } + } + + s->s3->empty_fragment_done = 1; + } + + p = wb->buf + prefix_len; + + /* write the header */ + + *(p++)=type&0xff; + wr->type=type; + + *(p++)=(s->version>>8); + *(p++)=s->version&0xff; + + /* field where we are to write out packet length */ + plen=p; + p+=2; + + /* lets setup the record stuff. */ + wr->data=p; + 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) + { + s->method->ssl3_enc->mac(s,&(p[wr->length]),1); + wr->length+=mac_size; + wr->input=p; + wr->data=p; + } + + /* ssl3_enc can only have an error on read */ + s->method->ssl3_enc->enc(s,1); + + /* record length after mac and block padding */ + s2n(wr->length,plen); + + /* 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; + wb->offset = 0; + + /* memorize arguments so that ssl3_write_pending can detect bad write retries later */ + s->s3->wpend_tot=len; + s->s3->wpend_buf=buf; + s->s3->wpend_type=type; + s->s3->wpend_ret=len; + + /* we now just need to write the buffer */ + return ssl3_write_pending(s,type,buf,len); +err: + return -1; + } + +/* if s->s3->wbuf.left != 0, we need to call this */ +int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, + unsigned int len) + { + int i; + +/* 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 *)&(s->s3->wbuf.buf[s->s3->wbuf.offset]), + (unsigned int)s->s3->wbuf.left); + } + else + { + SSLerr(SSL_F_SSL3_WRITE_PENDING,SSL_R_BIO_NOT_SET); + i= -1; + } + if (i == s->s3->wbuf.left) + { + s->s3->wbuf.left=0; + s->rwstate=SSL_NOTHING; + return(s->s3->wpend_ret); + } + else if (i <= 0) { + if (s->version == DTLS1_VERSION || + s->version == DTLS1_BAD_VER) { + /* For DTLS, just drop it. That's kind of the whole + point in using a datagram service */ + s->s3->wbuf.left = 0; + } + return(i); + } + s->s3->wbuf.offset+=i; + s->s3->wbuf.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_buffers(s)) + return(-1); + + if ((type && (type != SSL3_RT_APPLICATION_DATA) && (type != SSL3_RT_HANDSHAKE) && type) || + (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); + } + + /* 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; + } + } + 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; + } + + 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 (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 == 1) /* warning */ + { + s->s3->warn_alert = alert_descr; + if (alert_descr == SSL_AD_CLOSE_NOTIFY) + { + s->shutdown |= SSL_RECEIVED_SHUTDOWN; + return(0); + } + } + else if (alert_level == 2) /* 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->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; + } + + 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->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: +#ifndef OPENSSL_NO_TLS + /* TLS just ignores unknown message types */ + if (s->version == TLS1_VERSION) + { + rr->length = 0; + goto start; + } +#endif + al=SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_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) + { + /* 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; + } + + s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s, + &(s->s3->finish_dgst1), + &(s->s3->finish_dgst2), + sender,slen,s->s3->tmp.peer_finish_md); + + return(1); + } + +void 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; + /* If a fatal one, remove from cache */ + if ((level == 2) && (s->session != NULL)) + SSL_CTX_remove_session(s->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? */ + s->method->ssl_dispatch_alert(s); + /* else data is still being written out, we will get written + * some time in the future */ + } + +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); + } |