diff options
Diffstat (limited to 'main/openssl/ssl/s3_both.c')
| -rw-r--r-- | main/openssl/ssl/s3_both.c | 867 |
1 files changed, 867 insertions, 0 deletions
diff --git a/main/openssl/ssl/s3_both.c b/main/openssl/ssl/s3_both.c new file mode 100644 index 00000000..508e3902 --- /dev/null +++ b/main/openssl/ssl/s3_both.c @@ -0,0 +1,867 @@ +/* ssl/s3_both.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). + * + */ +/* ==================================================================== + * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. + * ECC cipher suite support in OpenSSL originally developed by + * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. + */ + +#include <limits.h> +#include <string.h> +#include <stdio.h> +#include "ssl_locl.h" +#include <openssl/buffer.h> +#include <openssl/rand.h> +#include <openssl/objects.h> +#include <openssl/evp.h> +#include <openssl/x509.h> + +/* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */ +int ssl3_do_write(SSL *s, int type) + { + int ret; + + ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off], + s->init_num); + if (ret < 0) return(-1); + if (type == SSL3_RT_HANDSHAKE) + /* should not be done for 'Hello Request's, but in that case + * we'll ignore the result anyway */ + ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret); + + if (ret == s->init_num) + { + if (s->msg_callback) + s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg); + return(1); + } + s->init_off+=ret; + s->init_num-=ret; + return(0); + } + +int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen) + { + unsigned char *p,*d; + int i; + unsigned long l; + + if (s->state == a) + { + d=(unsigned char *)s->init_buf->data; + p= &(d[4]); + + i=s->method->ssl3_enc->final_finish_mac(s, + sender,slen,s->s3->tmp.finish_md); + s->s3->tmp.finish_md_len = i; + memcpy(p, s->s3->tmp.finish_md, i); + p+=i; + l=i; + + /* Copy the finished so we can use it for + renegotiation checks */ + if(s->type == SSL_ST_CONNECT) + { + OPENSSL_assert(i <= EVP_MAX_MD_SIZE); + memcpy(s->s3->previous_client_finished, + s->s3->tmp.finish_md, i); + s->s3->previous_client_finished_len=i; + } + else + { + OPENSSL_assert(i <= EVP_MAX_MD_SIZE); + memcpy(s->s3->previous_server_finished, + s->s3->tmp.finish_md, i); + s->s3->previous_server_finished_len=i; + } + +#ifdef OPENSSL_SYS_WIN16 + /* MSVC 1.5 does not clear the top bytes of the word unless + * I do this. + */ + l&=0xffff; +#endif + + *(d++)=SSL3_MT_FINISHED; + l2n3(l,d); + s->init_num=(int)l+4; + s->init_off=0; + + s->state=b; + } + + /* SSL3_ST_SEND_xxxxxx_HELLO_B */ + return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); + } + +#ifndef OPENSSL_NO_NEXTPROTONEG +/* ssl3_take_mac calculates the Finished MAC for the handshakes messages seen to far. */ +static void ssl3_take_mac(SSL *s) + { + const char *sender; + int slen; + + 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, + sender,slen,s->s3->tmp.peer_finish_md); + } +#endif + +int ssl3_get_finished(SSL *s, int a, int b) + { + int al,i,ok; + long n; + unsigned char *p; + +#ifdef OPENSSL_NO_NEXTPROTONEG + /* the mac has already been generated when we received the + * change cipher spec message and is in s->s3->tmp.peer_finish_md + */ +#endif + + n=s->method->ssl_get_message(s, + a, + b, + SSL3_MT_FINISHED, + 64, /* should actually be 36+4 :-) */ + &ok); + + if (!ok) return((int)n); + + /* If this occurs, we have missed a message */ + if (!s->s3->change_cipher_spec) + { + al=SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS); + goto f_err; + } + s->s3->change_cipher_spec=0; + + p = (unsigned char *)s->init_msg; + i = s->s3->tmp.peer_finish_md_len; + + if (i != n) + { + al=SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH); + goto f_err; + } + + if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0) + { + al=SSL_AD_DECRYPT_ERROR; + SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED); + goto f_err; + } + + /* Copy the finished so we can use it for + renegotiation checks */ + if(s->type == SSL_ST_ACCEPT) + { + OPENSSL_assert(i <= EVP_MAX_MD_SIZE); + memcpy(s->s3->previous_client_finished, + s->s3->tmp.peer_finish_md, i); + s->s3->previous_client_finished_len=i; + } + else + { + OPENSSL_assert(i <= EVP_MAX_MD_SIZE); + memcpy(s->s3->previous_server_finished, + s->s3->tmp.peer_finish_md, i); + s->s3->previous_server_finished_len=i; + } + + return(1); +f_err: + ssl3_send_alert(s,SSL3_AL_FATAL,al); + return(0); + } + +/* for these 2 messages, we need to + * ssl->enc_read_ctx re-init + * ssl->s3->read_sequence zero + * ssl->s3->read_mac_secret re-init + * ssl->session->read_sym_enc assign + * ssl->session->read_compression assign + * ssl->session->read_hash assign + */ +int ssl3_send_change_cipher_spec(SSL *s, int a, int b) + { + unsigned char *p; + + if (s->state == a) + { + p=(unsigned char *)s->init_buf->data; + *p=SSL3_MT_CCS; + s->init_num=1; + s->init_off=0; + + s->state=b; + } + + /* SSL3_ST_CW_CHANGE_B */ + return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC)); + } + +static int ssl3_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x) + { + int n; + unsigned char *p; + + n=i2d_X509(x,NULL); + if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3))) + { + SSLerr(SSL_F_SSL3_ADD_CERT_TO_BUF,ERR_R_BUF_LIB); + return(-1); + } + p=(unsigned char *)&(buf->data[*l]); + l2n3(n,p); + i2d_X509(x,&p); + *l+=n+3; + + return(0); + } + +unsigned long ssl3_output_cert_chain(SSL *s, X509 *x) + { + unsigned char *p; + int i; + unsigned long l=7; + BUF_MEM *buf; + int no_chain; + STACK_OF(X509) *cert_chain; + + cert_chain = SSL_get_certificate_chain(s, x); + + if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs || cert_chain) + no_chain = 1; + else + no_chain = 0; + + /* TLSv1 sends a chain with nothing in it, instead of an alert */ + buf=s->init_buf; + if (!BUF_MEM_grow_clean(buf,10)) + { + SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB); + return(0); + } + if (x != NULL) + { + if (no_chain) + { + if (ssl3_add_cert_to_buf(buf, &l, x)) + return(0); + } + else + { + X509_STORE_CTX xs_ctx; + + if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL)) + { + SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB); + return(0); + } + X509_verify_cert(&xs_ctx); + /* Don't leave errors in the queue */ + ERR_clear_error(); + for (i=0; i < sk_X509_num(xs_ctx.chain); i++) + { + x = sk_X509_value(xs_ctx.chain, i); + + if (ssl3_add_cert_to_buf(buf, &l, x)) + { + X509_STORE_CTX_cleanup(&xs_ctx); + return 0; + } + } + X509_STORE_CTX_cleanup(&xs_ctx); + } + } + /* Thawte special :-) */ + for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++) + { + x=sk_X509_value(s->ctx->extra_certs,i); + if (ssl3_add_cert_to_buf(buf, &l, x)) + return(0); + } + + for (i=0; i<sk_X509_num(cert_chain); i++) + if (ssl3_add_cert_to_buf(buf, &l, sk_X509_value(cert_chain,i))) + return(0); + + l-=7; + p=(unsigned char *)&(buf->data[4]); + l2n3(l,p); + l+=3; + p=(unsigned char *)&(buf->data[0]); + *(p++)=SSL3_MT_CERTIFICATE; + l2n3(l,p); + l+=4; + return(l); + } + +/* Obtain handshake message of message type 'mt' (any if mt == -1), + * maximum acceptable body length 'max'. + * The first four bytes (msg_type and length) are read in state 'st1', + * the body is read in state 'stn'. + */ +long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok) + { + unsigned char *p; + unsigned long l; + long n; + int i,al; + + if (s->s3->tmp.reuse_message) + { + s->s3->tmp.reuse_message=0; + if ((mt >= 0) && (s->s3->tmp.message_type != mt)) + { + al=SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); + goto f_err; + } + *ok=1; + s->init_msg = s->init_buf->data + 4; + s->init_num = (int)s->s3->tmp.message_size; + return s->init_num; + } + + p=(unsigned char *)s->init_buf->data; + + if (s->state == st1) /* s->init_num < 4 */ + { + int skip_message; + + do + { + while (s->init_num < 4) + { + i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE, + &p[s->init_num],4 - s->init_num, 0); + if (i <= 0) + { + s->rwstate=SSL_READING; + *ok = 0; + return i; + } + s->init_num+=i; + } + + skip_message = 0; + if (!s->server) + if (p[0] == SSL3_MT_HELLO_REQUEST) + /* The server may always send 'Hello Request' messages -- + * we are doing a handshake anyway now, so ignore them + * if their format is correct. Does not count for + * 'Finished' MAC. */ + if (p[1] == 0 && p[2] == 0 &&p[3] == 0) + { + s->init_num = 0; + skip_message = 1; + + if (s->msg_callback) + s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg); + } + } + while (skip_message); + + /* s->init_num == 4 */ + + if ((mt >= 0) && (*p != mt)) + { + al=SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE); + goto f_err; + } + if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) && + (st1 == SSL3_ST_SR_CERT_A) && + (stn == SSL3_ST_SR_CERT_B)) + { + /* At this point we have got an MS SGC second client + * hello (maybe we should always allow the client to + * start a new handshake?). We need to restart the mac. + * Don't increment {num,total}_renegotiations because + * we have not completed the handshake. */ + ssl3_init_finished_mac(s); + } + + s->s3->tmp.message_type= *(p++); + + n2l3(p,l); + if (l > (unsigned long)max) + { + al=SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE); + goto f_err; + } + if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */ + { + al=SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE); + goto f_err; + } + if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4)) + { + SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB); + goto err; + } + s->s3->tmp.message_size=l; + s->state=stn; + + s->init_msg = s->init_buf->data + 4; + s->init_num = 0; + } + + /* next state (stn) */ + p = s->init_msg; + n = s->s3->tmp.message_size - s->init_num; + while (n > 0) + { + i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0); + if (i <= 0) + { + s->rwstate=SSL_READING; + *ok = 0; + return i; + } + s->init_num += i; + n -= i; + } + +#ifndef OPENSSL_NO_NEXTPROTONEG + /* If receiving Finished, record MAC of prior handshake messages for + * Finished verification. */ + if (*s->init_buf->data == SSL3_MT_FINISHED) + ssl3_take_mac(s); +#endif + + /* Feed this message into MAC computation. */ + ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4); + if (s->msg_callback) + s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg); + *ok=1; + return s->init_num; +f_err: + ssl3_send_alert(s,SSL3_AL_FATAL,al); +err: + *ok=0; + return(-1); + } + +int ssl_cert_type(X509 *x, EVP_PKEY *pkey) + { + EVP_PKEY *pk; + int ret= -1,i; + + if (pkey == NULL) + pk=X509_get_pubkey(x); + else + pk=pkey; + if (pk == NULL) goto err; + + i=pk->type; + if (i == EVP_PKEY_RSA) + { + ret=SSL_PKEY_RSA_ENC; + } + else if (i == EVP_PKEY_DSA) + { + ret=SSL_PKEY_DSA_SIGN; + } +#ifndef OPENSSL_NO_EC + else if (i == EVP_PKEY_EC) + { + ret = SSL_PKEY_ECC; + } +#endif + else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc) + { + ret = SSL_PKEY_GOST94; + } + else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc) + { + ret = SSL_PKEY_GOST01; + } +err: + if(!pkey) EVP_PKEY_free(pk); + return(ret); + } + +int ssl_verify_alarm_type(long type) + { + int al; + + switch(type) + { + case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: + case X509_V_ERR_UNABLE_TO_GET_CRL: + case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: + al=SSL_AD_UNKNOWN_CA; + break; + case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: + case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: + case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: + case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: + case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: + case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: + case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: + case X509_V_ERR_CERT_NOT_YET_VALID: + case X509_V_ERR_CRL_NOT_YET_VALID: + case X509_V_ERR_CERT_UNTRUSTED: + case X509_V_ERR_CERT_REJECTED: + al=SSL_AD_BAD_CERTIFICATE; + break; + case X509_V_ERR_CERT_SIGNATURE_FAILURE: + case X509_V_ERR_CRL_SIGNATURE_FAILURE: + al=SSL_AD_DECRYPT_ERROR; + break; + case X509_V_ERR_CERT_HAS_EXPIRED: + case X509_V_ERR_CRL_HAS_EXPIRED: + al=SSL_AD_CERTIFICATE_EXPIRED; + break; + case X509_V_ERR_CERT_REVOKED: + al=SSL_AD_CERTIFICATE_REVOKED; + break; + case X509_V_ERR_OUT_OF_MEM: + al=SSL_AD_INTERNAL_ERROR; + break; + case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: + case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: + case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: + case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: + case X509_V_ERR_CERT_CHAIN_TOO_LONG: + case X509_V_ERR_PATH_LENGTH_EXCEEDED: + case X509_V_ERR_INVALID_CA: + al=SSL_AD_UNKNOWN_CA; + break; + case X509_V_ERR_APPLICATION_VERIFICATION: + al=SSL_AD_HANDSHAKE_FAILURE; + break; + case X509_V_ERR_INVALID_PURPOSE: + al=SSL_AD_UNSUPPORTED_CERTIFICATE; + break; + default: + al=SSL_AD_CERTIFICATE_UNKNOWN; + break; + } + return(al); + } + +#ifndef OPENSSL_NO_BUF_FREELISTS +/* On some platforms, malloc() performance is bad enough that you can't just + * free() and malloc() buffers all the time, so we need to use freelists from + * unused buffers. Currently, each freelist holds memory chunks of only a + * given size (list->chunklen); other sized chunks are freed and malloced. + * This doesn't help much if you're using many different SSL option settings + * with a given context. (The options affecting buffer size are + * max_send_fragment, read buffer vs write buffer, + * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and + * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.) Using a separate freelist for every + * possible size is not an option, since max_send_fragment can take on many + * different values. + * + * If you are on a platform with a slow malloc(), and you're using SSL + * connections with many different settings for these options, and you need to + * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options: + * - Link against a faster malloc implementation. + * - Use a separate SSL_CTX for each option set. + * - Improve this code. + */ +static void * +freelist_extract(SSL_CTX *ctx, int for_read, int sz) + { + SSL3_BUF_FREELIST *list; + SSL3_BUF_FREELIST_ENTRY *ent = NULL; + void *result = NULL; + + CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); + list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; + if (list != NULL && sz == (int)list->chunklen) + ent = list->head; + if (ent != NULL) + { + list->head = ent->next; + result = ent; + if (--list->len == 0) + list->chunklen = 0; + } + CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); + if (!result) + result = OPENSSL_malloc(sz); + return result; +} + +static void +freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem) + { + SSL3_BUF_FREELIST *list; + SSL3_BUF_FREELIST_ENTRY *ent; + + CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); + list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist; + if (list != NULL && + (sz == list->chunklen || list->chunklen == 0) && + list->len < ctx->freelist_max_len && + sz >= sizeof(*ent)) + { + list->chunklen = sz; + ent = mem; + ent->next = list->head; + list->head = ent; + ++list->len; + mem = NULL; + } + + CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); + if (mem) + OPENSSL_free(mem); + } +#else +#define freelist_extract(c,fr,sz) OPENSSL_malloc(sz) +#define freelist_insert(c,fr,sz,m) OPENSSL_free(m) +#endif + +int ssl3_setup_read_buffer(SSL *s) + { + unsigned char *p; + size_t len,align=0,headerlen; + + if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) + headerlen = DTLS1_RT_HEADER_LENGTH; + else + headerlen = SSL3_RT_HEADER_LENGTH; + +#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 + align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1); +#endif + + if (s->s3->rbuf.buf == NULL) + { + if (SSL_get_mode(s) & SSL_MODE_SMALL_BUFFERS) + { + len = SSL3_RT_DEFAULT_PACKET_SIZE; + } + else + { + len = SSL3_RT_MAX_PLAIN_LENGTH + + SSL3_RT_MAX_ENCRYPTED_OVERHEAD + + headerlen + align; + if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) + { + s->s3->init_extra = 1; + len += SSL3_RT_MAX_EXTRA; + } + } +#ifndef OPENSSL_NO_COMP + if (!(s->options & SSL_OP_NO_COMPRESSION)) + len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; +#endif + if ((p=freelist_extract(s->ctx, 1, len)) == NULL) + goto err; + s->s3->rbuf.buf = p; + s->s3->rbuf.len = len; + } + + s->packet= &(s->s3->rbuf.buf[0]); + return 1; + +err: + SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER,ERR_R_MALLOC_FAILURE); + return 0; + } + +int ssl3_setup_write_buffer(SSL *s) + { + unsigned char *p; + size_t len,align=0,headerlen; + + if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) + headerlen = DTLS1_RT_HEADER_LENGTH + 1; + else + headerlen = SSL3_RT_HEADER_LENGTH; + +#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 + align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1); +#endif + + if (s->s3->wbuf.buf == NULL) + { + if (SSL_get_mode(s) & SSL_MODE_SMALL_BUFFERS) + { + len = SSL3_RT_DEFAULT_PACKET_SIZE; + } + else + { + len = s->max_send_fragment; + } + len += 0 + + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + + headerlen + align; +#ifndef OPENSSL_NO_COMP + if (!(s->options & SSL_OP_NO_COMPRESSION)) + len += SSL3_RT_MAX_COMPRESSED_OVERHEAD; +#endif + if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) + len += headerlen + align + + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD; + if ((p=freelist_extract(s->ctx, 0, len)) == NULL) + goto err; + s->s3->wbuf.buf = p; + s->s3->wbuf.len = len; + } + + return 1; + +err: + SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER,ERR_R_MALLOC_FAILURE); + return 0; + } + + +int ssl3_setup_buffers(SSL *s) + { + if (!ssl3_setup_read_buffer(s)) + return 0; + if (!ssl3_setup_write_buffer(s)) + return 0; + return 1; + } + +int ssl3_release_write_buffer(SSL *s) + { + if (s->s3->wbuf.buf != NULL) + { + freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf); + s->s3->wbuf.buf = NULL; + } + return 1; + } + +int ssl3_release_read_buffer(SSL *s) + { + if (s->s3->rbuf.buf != NULL) + { + freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf); + s->s3->rbuf.buf = NULL; + } + return 1; + } |