/* ssl/s3_enc.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) 1998-2007 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 2005 Nokia. All rights reserved. * * The portions of the attached software ("Contribution") is developed by * Nokia Corporation and is licensed pursuant to the OpenSSL open source * license. * * The Contribution, originally written by Mika Kousa and Pasi Eronen of * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites * support (see RFC 4279) to OpenSSL. * * No patent licenses or other rights except those expressly stated in * the OpenSSL open source license shall be deemed granted or received * expressly, by implication, estoppel, or otherwise. * * No assurances are provided by Nokia that the Contribution does not * infringe the patent or other intellectual property rights of any third * party or that the license provides you with all the necessary rights * to make use of the Contribution. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR * OTHERWISE. */ #include #include "ssl_locl.h" #include #include static unsigned char ssl3_pad_1[48]={ 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; static unsigned char ssl3_pad_2[48]={ 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; static int ssl3_handshake_mac(SSL *s, int md_nid, const char *sender, int len, unsigned char *p); static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) { EVP_MD_CTX m5; EVP_MD_CTX s1; unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; unsigned char c='A'; unsigned int i,j,k; #ifdef CHARSET_EBCDIC c = os_toascii[c]; /*'A' in ASCII */ #endif k=0; EVP_MD_CTX_init(&m5); EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); EVP_MD_CTX_init(&s1); for (i=0; (int)i sizeof buf) { /* bug: 'buf' is too small for this ciphersuite */ SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); return 0; } for (j=0; jsession->master_key, s->session->master_key_length); EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); EVP_DigestFinal_ex(&s1,smd,NULL); EVP_DigestInit_ex(&m5,EVP_md5(), NULL); EVP_DigestUpdate(&m5,s->session->master_key, s->session->master_key_length); EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); if ((int)(i+MD5_DIGEST_LENGTH) > num) { EVP_DigestFinal_ex(&m5,smd,NULL); memcpy(km,smd,(num-i)); } else EVP_DigestFinal_ex(&m5,km,NULL); km+=MD5_DIGEST_LENGTH; } OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); EVP_MD_CTX_cleanup(&m5); EVP_MD_CTX_cleanup(&s1); return 1; } int ssl3_change_cipher_state(SSL *s, int which) { unsigned char *p,*mac_secret; unsigned char exp_key[EVP_MAX_KEY_LENGTH]; unsigned char exp_iv[EVP_MAX_IV_LENGTH]; unsigned char *ms,*key,*iv,*er1,*er2; EVP_CIPHER_CTX *dd; const EVP_CIPHER *c; #ifndef OPENSSL_NO_COMP COMP_METHOD *comp; #endif const EVP_MD *m; EVP_MD_CTX md; int is_exp,n,i,j,k,cl; int reuse_dd = 0; is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); c=s->s3->tmp.new_sym_enc; m=s->s3->tmp.new_hash; /* m == NULL will lead to a crash later */ OPENSSL_assert(m); #ifndef OPENSSL_NO_COMP if (s->s3->tmp.new_compression == NULL) comp=NULL; else comp=s->s3->tmp.new_compression->method; #endif if (which & SSL3_CC_READ) { if (s->enc_read_ctx != NULL) reuse_dd = 1; else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) goto err; else /* make sure it's intialized in case we exit later with an error */ EVP_CIPHER_CTX_init(s->enc_read_ctx); dd= s->enc_read_ctx; ssl_replace_hash(&s->read_hash,m); #ifndef OPENSSL_NO_COMP /* COMPRESS */ if (s->expand != NULL) { COMP_CTX_free(s->expand); s->expand=NULL; } if (comp != NULL) { s->expand=COMP_CTX_new(comp); if (s->expand == NULL) { SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); goto err2; } if (s->s3->rrec.comp == NULL) s->s3->rrec.comp=(unsigned char *) OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); if (s->s3->rrec.comp == NULL) goto err; } #endif memset(&(s->s3->read_sequence[0]),0,8); mac_secret= &(s->s3->read_mac_secret[0]); } else { if (s->enc_write_ctx != NULL) reuse_dd = 1; else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) goto err; else /* make sure it's intialized in case we exit later with an error */ EVP_CIPHER_CTX_init(s->enc_write_ctx); dd= s->enc_write_ctx; ssl_replace_hash(&s->write_hash,m); #ifndef OPENSSL_NO_COMP /* COMPRESS */ if (s->compress != NULL) { COMP_CTX_free(s->compress); s->compress=NULL; } if (comp != NULL) { s->compress=COMP_CTX_new(comp); if (s->compress == NULL) { SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); goto err2; } } #endif memset(&(s->s3->write_sequence[0]),0,8); mac_secret= &(s->s3->write_mac_secret[0]); } if (reuse_dd) EVP_CIPHER_CTX_cleanup(dd); p=s->s3->tmp.key_block; i=EVP_MD_size(m); if (i < 0) goto err2; cl=EVP_CIPHER_key_length(c); j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ k=EVP_CIPHER_iv_length(c); if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || (which == SSL3_CHANGE_CIPHER_SERVER_READ)) { ms= &(p[ 0]); n=i+i; key= &(p[ n]); n+=j+j; iv= &(p[ n]); n+=k+k; er1= &(s->s3->client_random[0]); er2= &(s->s3->server_random[0]); } else { n=i; ms= &(p[ n]); n+=i+j; key= &(p[ n]); n+=j+k; iv= &(p[ n]); n+=k; er1= &(s->s3->server_random[0]); er2= &(s->s3->client_random[0]); } if (n > s->s3->tmp.key_block_length) { SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); goto err2; } EVP_MD_CTX_init(&md); memcpy(mac_secret,ms,i); if (is_exp) { /* In here I set both the read and write key/iv to the * same value since only the correct one will be used :-). */ EVP_DigestInit_ex(&md,EVP_md5(), NULL); EVP_DigestUpdate(&md,key,j); EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); key= &(exp_key[0]); if (k > 0) { EVP_DigestInit_ex(&md,EVP_md5(), NULL); EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); iv= &(exp_iv[0]); } } s->session->key_arg_length=0; EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); EVP_MD_CTX_cleanup(&md); return(1); err: SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); err2: return(0); } int ssl3_setup_key_block(SSL *s) { unsigned char *p; const EVP_CIPHER *c; const EVP_MD *hash; int num; int ret = 0; SSL_COMP *comp; if (s->s3->tmp.key_block_length != 0) return(1); if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp)) { SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); return(0); } s->s3->tmp.new_sym_enc=c; s->s3->tmp.new_hash=hash; #ifdef OPENSSL_NO_COMP s->s3->tmp.new_compression=NULL; #else s->s3->tmp.new_compression=comp; #endif num=EVP_MD_size(hash); if (num < 0) return 0; num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c); num*=2; ssl3_cleanup_key_block(s); if ((p=OPENSSL_malloc(num)) == NULL) goto err; s->s3->tmp.key_block_length=num; s->s3->tmp.key_block=p; ret = ssl3_generate_key_block(s,p,num); if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) { /* enable vulnerability countermeasure for CBC ciphers with * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) */ s->s3->need_empty_fragments = 1; if (s->session->cipher != NULL) { if (s->session->cipher->algorithm_enc == SSL_eNULL) s->s3->need_empty_fragments = 0; #ifndef OPENSSL_NO_RC4 if (s->session->cipher->algorithm_enc == SSL_RC4) s->s3->need_empty_fragments = 0; #endif } } return ret; err: SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); return(0); } void ssl3_cleanup_key_block(SSL *s) { if (s->s3->tmp.key_block != NULL) { OPENSSL_cleanse(s->s3->tmp.key_block, s->s3->tmp.key_block_length); OPENSSL_free(s->s3->tmp.key_block); s->s3->tmp.key_block=NULL; } s->s3->tmp.key_block_length=0; } /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. * * Returns: * 0: (in non-constant time) if the record is publically invalid (i.e. too * short etc). * 1: if the record's padding is valid / the encryption was successful. * -1: if the record's padding is invalid or, if sending, an internal error * occured. */ int ssl3_enc(SSL *s, int send) { SSL3_RECORD *rec; EVP_CIPHER_CTX *ds; unsigned long l; int bs,i,mac_size=0; const EVP_CIPHER *enc; if (send) { ds=s->enc_write_ctx; rec= &(s->s3->wrec); if (s->enc_write_ctx == NULL) enc=NULL; else enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); } else { ds=s->enc_read_ctx; rec= &(s->s3->rrec); if (s->enc_read_ctx == NULL) enc=NULL; else enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); } if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { memmove(rec->data,rec->input,rec->length); rec->input=rec->data; } else { l=rec->length; bs=EVP_CIPHER_block_size(ds->cipher); /* COMPRESS */ if ((bs != 1) && send) { i=bs-((int)l%bs); s->write_stats.pad_bytes += i; /* we need to add 'i-1' padding bytes */ l+=i; /* the last of these zero bytes will be overwritten * with the padding length. */ memset(&rec->input[rec->length], 0, i); rec->length+=i; rec->input[l-1]=(i-1); } if (!send) { if (l == 0 || l%bs != 0) return 0; /* otherwise, rec->length >= bs */ } EVP_Cipher(ds,rec->data,rec->input,l); if (EVP_MD_CTX_md(s->read_hash) != NULL) mac_size = EVP_MD_CTX_size(s->read_hash); if ((bs != 1) && !send) { int ret; i = rec->length; ret = ssl3_cbc_remove_padding(s, rec, bs, mac_size); s->read_stats.pad_bytes += i - rec->length; return ret; } } return(1); } void ssl3_init_finished_mac(SSL *s) { if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); if (s->s3->handshake_dgst) ssl3_free_digest_list(s); s->s3->handshake_buffer=BIO_new(BIO_s_mem()); (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); } void ssl3_free_digest_list(SSL *s) { int i; if (!s->s3->handshake_dgst) return; for (i=0;is3->handshake_dgst[i]) EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); } OPENSSL_free(s->s3->handshake_dgst); s->s3->handshake_dgst=NULL; } void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) { if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { BIO_write (s->s3->handshake_buffer,(void *)buf,len); } else { int i; for (i=0;i< SSL_MAX_DIGEST;i++) { if (s->s3->handshake_dgst[i]!= NULL) EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); } } } int ssl3_digest_cached_records(SSL *s) { int i; long mask; const EVP_MD *md; long hdatalen; void *hdata; /* Allocate handshake_dgst array */ ssl3_free_digest_list(s); s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata); if (hdatalen <= 0) { SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); return 0; } /* Loop through bitso of algorithm2 field and create MD_CTX-es */ for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) { if ((mask & ssl_get_algorithm2(s)) && md) { s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); #ifdef OPENSSL_FIPS if (EVP_MD_nid(md) == NID_md5) { EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i], EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); } #endif EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); } else { s->s3->handshake_dgst[i]=NULL; } } if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { /* Free handshake_buffer BIO */ BIO_free(s->s3->handshake_buffer); s->s3->handshake_buffer = NULL; } return 1; } int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) { return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); } int ssl3_final_finish_mac(SSL *s, const char *sender, int len, unsigned char *p) { int ret, sha1len; ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); if(ret == 0) return 0; p+=ret; sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p); if(sha1len == 0) return 0; ret+=sha1len; return(ret); } static int ssl3_handshake_mac(SSL *s, int md_nid, const char *sender, int len, unsigned char *p) { unsigned int ret; int npad,n; unsigned int i; unsigned char md_buf[EVP_MAX_MD_SIZE]; EVP_MD_CTX ctx,*d=NULL; if (s->s3->handshake_buffer) if (!ssl3_digest_cached_records(s)) return 0; /* Search for digest of specified type in the handshake_dgst * array*/ for (i=0;is3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) { d=s->s3->handshake_dgst[i]; break; } } if (!d) { SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST); return 0; } EVP_MD_CTX_init(&ctx); EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); EVP_MD_CTX_copy_ex(&ctx,d); n=EVP_MD_CTX_size(&ctx); if (n < 0) return 0; npad=(48/n)*n; if (sender != NULL) EVP_DigestUpdate(&ctx,sender,len); EVP_DigestUpdate(&ctx,s->session->master_key, s->session->master_key_length); EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); EVP_DigestFinal_ex(&ctx,md_buf,&i); EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); EVP_DigestUpdate(&ctx,s->session->master_key, s->session->master_key_length); EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); EVP_DigestUpdate(&ctx,md_buf,i); EVP_DigestFinal_ex(&ctx,p,&ret); EVP_MD_CTX_cleanup(&ctx); return((int)ret); } int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) { SSL3_RECORD *rec; unsigned char *mac_sec,*seq; EVP_MD_CTX md_ctx; const EVP_MD_CTX *hash; unsigned char *p,rec_char; size_t md_size, orig_len; int npad; int t; if (send) { rec= &(ssl->s3->wrec); mac_sec= &(ssl->s3->write_mac_secret[0]); seq= &(ssl->s3->write_sequence[0]); hash=ssl->write_hash; } else { rec= &(ssl->s3->rrec); mac_sec= &(ssl->s3->read_mac_secret[0]); seq= &(ssl->s3->read_sequence[0]); hash=ssl->read_hash; } t=EVP_MD_CTX_size(hash); if (t < 0) return -1; md_size=t; npad=(48/md_size)*md_size; /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */ orig_len = rec->length+md_size+((unsigned int)rec->type>>8); rec->type &= 0xff; if (!send && EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && ssl3_cbc_record_digest_supported(hash)) { /* This is a CBC-encrypted record. We must avoid leaking any * timing-side channel information about how many blocks of * data we are hashing because that gives an attacker a * timing-oracle. */ /* npad is, at most, 48 bytes and that's with MD5: * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. * * With SHA-1 (the largest hash speced for SSLv3) the hash size * goes up 4, but npad goes down by 8, resulting in a smaller * total size. */ unsigned char header[75]; unsigned j = 0; memcpy(header+j, mac_sec, md_size); j += md_size; memcpy(header+j, ssl3_pad_1, npad); j += npad; memcpy(header+j, seq, 8); j += 8; header[j++] = rec->type; header[j++] = rec->length >> 8; header[j++] = rec->length & 0xff; ssl3_cbc_digest_record( hash, md, &md_size, header, rec->input, rec->length + md_size, orig_len, mac_sec, md_size, 1 /* is SSLv3 */); } else { unsigned int md_size_u; /* Chop the digest off the end :-) */ EVP_MD_CTX_init(&md_ctx); EVP_MD_CTX_copy_ex( &md_ctx,hash); EVP_DigestUpdate(&md_ctx,mac_sec,md_size); EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); EVP_DigestUpdate(&md_ctx,seq,8); rec_char=rec->type; EVP_DigestUpdate(&md_ctx,&rec_char,1); p=md; s2n(rec->length,p); EVP_DigestUpdate(&md_ctx,md,2); EVP_DigestUpdate(&md_ctx,rec->input,rec->length); EVP_DigestFinal_ex( &md_ctx,md,NULL); EVP_MD_CTX_copy_ex( &md_ctx,hash); EVP_DigestUpdate(&md_ctx,mac_sec,md_size); EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); EVP_DigestUpdate(&md_ctx,md,md_size); EVP_DigestFinal_ex( &md_ctx,md,&md_size_u); md_size = md_size_u; EVP_MD_CTX_cleanup(&md_ctx); } ssl3_record_sequence_update(seq); return(md_size); } void ssl3_record_sequence_update(unsigned char *seq) { int i; for (i=7; i>=0; i--) { ++seq[i]; if (seq[i] != 0) break; } } int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, int len) { static const unsigned char *salt[3]={ #ifndef CHARSET_EBCDIC (const unsigned char *)"A", (const unsigned char *)"BB", (const unsigned char *)"CCC", #else (const unsigned char *)"\x41", (const unsigned char *)"\x42\x42", (const unsigned char *)"\x43\x43\x43", #endif }; unsigned char buf[EVP_MAX_MD_SIZE]; EVP_MD_CTX ctx; int i,ret=0; unsigned int n; EVP_MD_CTX_init(&ctx); for (i=0; i<3; i++) { EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); EVP_DigestUpdate(&ctx,p,len); EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), SSL3_RANDOM_SIZE); EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), SSL3_RANDOM_SIZE); EVP_DigestFinal_ex(&ctx,buf,&n); EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); EVP_DigestUpdate(&ctx,p,len); EVP_DigestUpdate(&ctx,buf,n); EVP_DigestFinal_ex(&ctx,out,&n); out+=n; ret+=n; } EVP_MD_CTX_cleanup(&ctx); return(ret); } int ssl3_alert_code(int code) { switch (code) { case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK); default: return(-1); } }