tls1_change_cipher_state rewrite
The previous version of the function made adding AEAD changes very difficult. This change should be a semantic no-op - it should be purely a cleanup.
This commit is contained in:
Adam Langley
parent
1b9d47735c
commit
a5fa5b7bb6
@ -2657,6 +2657,7 @@ void ERR_load_SSL_strings(void);
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#define SSL_F_ssl3_get_channel_id 275
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#define SSL_F_ssl3_send_channel_id 276
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#define SSL_F_SSL_CTX_set_cipher_list_tls11 277
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#define SSL_F_tls1_change_cipher_state_cipher 278
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#define SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS 100
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#define SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC 101
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#define SSL_R_INVALID_NULL_CMD_NAME 102
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@ -190,6 +190,7 @@ const ERR_STRING_DATA SSL_error_string_data[] = {
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_PRF, 0), "tls1_PRF"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_cert_verify_mac, 0), "tls1_cert_verify_mac"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_change_cipher_state, 0), "tls1_change_cipher_state"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_change_cipher_state_cipher, 0), "tls1_change_cipher_state_cipher"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_export_keying_material, 0), "tls1_export_keying_material"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_get_server_supplemental_data, 0), "tls1_get_server_supplemental_data"},
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{ERR_PACK(ERR_LIB_SSL, SSL_F_tls1_heartbeat, 0), "tls1_heartbeat"},
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393
ssl/t1_enc.c
393
ssl/t1_enc.c
@ -311,249 +311,252 @@ static int tls1_generate_key_block(SSL *s, unsigned char *km,
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return ret;
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}
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int tls1_change_cipher_state(SSL *s, int which)
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/* tls1_change_cipher_state_cipher performs the work needed to switch cipher
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* states when using EVP_CIPHER. The argument |is_read| is true iff this
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* function is being called due to reading, as opposed to writing, a
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* ChangeCipherSpec message. In order to support export ciphersuites,
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* use_client_keys indicates whether the key material provided is in the
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* "client write" direction. */
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static int tls1_change_cipher_state_cipher(
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SSL *s, char is_read, char use_client_keys,
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const unsigned char *mac_secret, unsigned mac_secret_len,
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const unsigned char *key, unsigned key_len,
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const unsigned char *iv, unsigned iv_len)
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{
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static const unsigned char empty[]="";
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unsigned char *p,*mac_secret;
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unsigned char *exp_label;
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unsigned char tmp1[EVP_MAX_KEY_LENGTH];
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unsigned char tmp2[EVP_MAX_KEY_LENGTH];
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unsigned char iv1[EVP_MAX_IV_LENGTH*2];
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unsigned char iv2[EVP_MAX_IV_LENGTH*2];
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unsigned char *ms,*key,*iv;
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int client_write;
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EVP_CIPHER_CTX *dd;
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const EVP_CIPHER *c;
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const EVP_MD *m;
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int mac_type;
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int *mac_secret_size;
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const EVP_CIPHER *cipher = s->s3->tmp.new_sym_enc;
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const char is_export = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) != 0;
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EVP_CIPHER_CTX *cipher_ctx;
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EVP_MD_CTX *mac_ctx;
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EVP_PKEY *mac_key;
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int is_export,n,i,j,k,exp_label_len,cl;
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int reuse_dd = 0;
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char is_aead_cipher;
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is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
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c=s->s3->tmp.new_sym_enc;
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m=s->s3->tmp.new_hash;
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mac_type = s->s3->tmp.new_mac_pkey_type;
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unsigned char export_tmp1[EVP_MAX_KEY_LENGTH];
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unsigned char export_tmp2[EVP_MAX_KEY_LENGTH];
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unsigned char export_iv1[EVP_MAX_IV_LENGTH * 2];
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unsigned char export_iv2[EVP_MAX_IV_LENGTH * 2];
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#ifdef KSSL_DEBUG
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printf("tls1_change_cipher_state(which= %d) w/\n", which);
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printf("\talg= %ld/%ld, comp= %p\n",
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s->s3->tmp.new_cipher->algorithm_mkey,
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s->s3->tmp.new_cipher->algorithm_auth,
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comp);
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printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
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printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
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c->nid,c->block_size,c->key_len,c->iv_len);
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printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
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{
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int i;
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for (i=0; i<s->s3->tmp.key_block_length; i++)
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printf("%02x", s->s3->tmp.key_block[i]); printf("\n");
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}
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#endif /* KSSL_DEBUG */
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if (which & SSL3_CC_READ)
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if (is_read)
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{
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if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
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s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
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else
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s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
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if (s->enc_read_ctx != NULL)
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reuse_dd = 1;
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else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
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if (s->enc_read_ctx != NULL && !SSL_IS_DTLS(s))
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EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
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else if ((s->enc_read_ctx=EVP_CIPHER_CTX_new()) == NULL)
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goto err;
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else
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/* make sure it's intialized in case we exit later with an error */
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EVP_CIPHER_CTX_init(s->enc_read_ctx);
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dd= s->enc_read_ctx;
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mac_ctx=ssl_replace_hash(&s->read_hash,NULL);
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/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
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if (s->version != DTLS1_VERSION)
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memset(&(s->s3->read_sequence[0]),0,8);
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mac_secret= &(s->s3->read_mac_secret[0]);
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mac_secret_size=&(s->s3->read_mac_secret_size);
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cipher_ctx = s->enc_read_ctx;
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mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
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memcpy(s->s3->read_mac_secret, mac_secret, mac_secret_len);
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s->s3->read_mac_secret_size = mac_secret_len;
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}
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else
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{
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if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
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s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
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else
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else
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s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
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/* When updating the write contexts for DTLS, we do not wish to
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* free the old ones because DTLS stores pointers to them in
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* order to implement retransmission. */
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if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s))
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reuse_dd = 1;
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else if ((s->enc_write_ctx=EVP_CIPHER_CTX_new()) == NULL)
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EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
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else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
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goto err;
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dd= s->enc_write_ctx;
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else
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/* make sure it's intialized in case we exit later with an error */
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EVP_CIPHER_CTX_init(s->enc_write_ctx);
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cipher_ctx = s->enc_write_ctx;
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if (SSL_IS_DTLS(s))
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{
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/* This is the same as ssl_replace_hash, but doesn't
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* free the old |s->write_hash|. */
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mac_ctx = EVP_MD_CTX_create();
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if (!mac_ctx)
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goto err;
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s->write_hash = mac_ctx;
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}
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else
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mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
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/* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
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if (s->version != DTLS1_VERSION)
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memset(&(s->s3->write_sequence[0]),0,8);
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mac_secret= &(s->s3->write_mac_secret[0]);
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mac_secret_size = &(s->s3->write_mac_secret_size);
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mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
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memcpy(s->s3->write_mac_secret, mac_secret, mac_secret_len);
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s->s3->write_mac_secret_size = mac_secret_len;
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}
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if (reuse_dd)
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EVP_CIPHER_CTX_cleanup(dd);
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p=s->s3->tmp.key_block;
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i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;
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cl=EVP_CIPHER_key_length(c);
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j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
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cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
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/* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
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/* If GCM mode only part of IV comes from PRF */
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if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
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k = EVP_GCM_TLS_FIXED_IV_LEN;
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else
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k=EVP_CIPHER_iv_length(c);
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if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
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(which == SSL3_CHANGE_CIPHER_SERVER_READ))
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{
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ms= &(p[ 0]); n=i+i;
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key= &(p[ n]); n+=j+j;
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iv= &(p[ n]); n+=k+k;
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exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
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exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
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client_write=1;
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}
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else
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{
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n=i;
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ms= &(p[ n]); n+=i+j;
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key= &(p[ n]); n+=j+k;
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iv= &(p[ n]); n+=k;
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exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
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exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
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client_write=0;
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}
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if (n > s->s3->tmp.key_block_length)
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{
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OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_INTERNAL_ERROR);
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goto err2;
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}
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memcpy(mac_secret,ms,i);
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if (!(EVP_CIPHER_flags(c)&EVP_CIPH_FLAG_AEAD_CIPHER))
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{
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mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
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mac_secret,*mac_secret_size);
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EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);
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EVP_PKEY_free(mac_key);
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}
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#ifdef TLS_DEBUG
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printf("which = %04X\nmac key=",which);
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{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
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#endif
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if (is_export)
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{
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/* In here I set both the read and write key/iv to the
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* same value since only the correct one will be used :-).
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*/
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if (!tls1_PRF(ssl_get_algorithm2(s),
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exp_label,exp_label_len,
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s->s3->client_random,SSL3_RANDOM_SIZE,
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s->s3->server_random,SSL3_RANDOM_SIZE,
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NULL,0,NULL,0,
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key,j,tmp1,tmp2,EVP_CIPHER_key_length(c)))
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goto err2;
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key=tmp1;
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const unsigned char *label;
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unsigned label_len;
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if (k > 0)
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if (use_client_keys)
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{
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label = (const unsigned char*) TLS_MD_CLIENT_WRITE_KEY_CONST;
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label_len = TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
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}
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else
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{
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label = (const unsigned char*) TLS_MD_SERVER_WRITE_KEY_CONST;
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label_len = TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
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}
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if (!tls1_PRF(ssl_get_algorithm2(s),
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label, label_len,
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s->s3->client_random, SSL3_RANDOM_SIZE,
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s->s3->server_random, SSL3_RANDOM_SIZE,
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NULL, 0, NULL, 0,
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key /* secret */, key_len /* secret length */,
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export_tmp1 /* output */,
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export_tmp2 /* scratch space */,
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EVP_CIPHER_key_length(s->s3->tmp.new_sym_enc) /* output length */))
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return 0;
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key = export_tmp1;
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if (iv_len > 0)
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{
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static const unsigned char empty[] = "";
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if (!tls1_PRF(ssl_get_algorithm2(s),
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TLS_MD_IV_BLOCK_CONST,TLS_MD_IV_BLOCK_CONST_SIZE,
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s->s3->client_random,SSL3_RANDOM_SIZE,
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s->s3->server_random,SSL3_RANDOM_SIZE,
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NULL,0,NULL,0,
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empty,0,iv1,iv2,k*2))
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goto err2;
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if (client_write)
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iv=iv1;
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TLS_MD_IV_BLOCK_CONST, TLS_MD_IV_BLOCK_CONST_SIZE,
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s->s3->client_random, SSL3_RANDOM_SIZE,
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s->s3->server_random, SSL3_RANDOM_SIZE,
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NULL, 0, NULL, 0,
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empty /* secret */ ,0 /* secret length */,
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export_iv1 /* output */,
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export_iv2 /* scratch space */,
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iv_len * 2 /* output length */))
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return 0;
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if (use_client_keys)
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iv = export_iv1;
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else
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iv= &(iv1[k]);
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iv = &export_iv1[iv_len];
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}
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}
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s->session->key_arg_length=0;
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#ifdef KSSL_DEBUG
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{
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int i;
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printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
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printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
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printf("\n");
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printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
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printf("\n");
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}
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#endif /* KSSL_DEBUG */
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/* is_aead_cipher indicates whether the EVP_CIPHER implements an AEAD
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* interface. This is different from the newer EVP_AEAD interface. */
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is_aead_cipher = (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0;
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if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
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if (!is_aead_cipher)
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{
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EVP_CipherInit_ex(dd,c,NULL,key,NULL,(which & SSL3_CC_WRITE));
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EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, k, iv);
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EVP_PKEY *mac_key =
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EVP_PKEY_new_mac_key(s->s3->tmp.new_mac_pkey_type,
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NULL, mac_secret, mac_secret_len);
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if (!mac_key)
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return 0;
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EVP_DigestSignInit(mac_ctx, NULL, s->s3->tmp.new_hash, NULL, mac_key);
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EVP_PKEY_free(mac_key);
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}
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else
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EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
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if (EVP_CIPHER_mode(cipher) == EVP_CIPH_GCM_MODE)
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{
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EVP_CipherInit_ex(cipher_ctx, cipher, NULL /* engine */, key,
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NULL /* iv */, !is_read);
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EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_GCM_SET_IV_FIXED, iv_len, (void*) iv);
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}
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else
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EVP_CipherInit_ex(cipher_ctx, cipher, NULL /* engine */, key, iv, !is_read);
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/* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
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if ((EVP_CIPHER_flags(c)&EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size)
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EVP_CIPHER_CTX_ctrl(dd,EVP_CTRL_AEAD_SET_MAC_KEY,
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*mac_secret_size,mac_secret);
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if (is_aead_cipher && mac_secret_len > 0)
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EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_AEAD_SET_MAC_KEY,
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mac_secret_len, (void*) mac_secret);
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#ifdef OPENSSL_SSL_TRACE_CRYPTO
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if (s->msg_callback)
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if (is_export)
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{
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int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;
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if (*mac_secret_size)
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s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
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mac_secret, *mac_secret_size,
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s, s->msg_callback_arg);
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if (c->key_len)
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s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
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key, c->key_len,
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s, s->msg_callback_arg);
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if (k)
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{
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if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
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wh |= TLS1_RT_CRYPTO_FIXED_IV;
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else
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wh |= TLS1_RT_CRYPTO_IV;
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s->msg_callback(2, s->version, wh, iv, k,
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s, s->msg_callback_arg);
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}
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OPENSSL_cleanse(export_tmp1, sizeof(export_tmp1));
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OPENSSL_cleanse(export_tmp2, sizeof(export_tmp1));
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OPENSSL_cleanse(export_iv1, sizeof(export_iv1));
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OPENSSL_cleanse(export_iv2, sizeof(export_iv2));
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}
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#endif
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#ifdef TLS_DEBUG
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printf("which = %04X\nkey=",which);
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{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
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printf("\niv=");
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{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
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printf("\n");
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#endif
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return 1;
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OPENSSL_cleanse(tmp1,sizeof(tmp1));
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OPENSSL_cleanse(tmp2,sizeof(tmp1));
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OPENSSL_cleanse(iv1,sizeof(iv1));
|
||||
OPENSSL_cleanse(iv2,sizeof(iv2));
|
||||
return(1);
|
||||
err:
|
||||
OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_MALLOC_FAILURE);
|
||||
err2:
|
||||
return(0);
|
||||
OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state_cipher, ERR_R_MALLOC_FAILURE);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int tls1_change_cipher_state(SSL *s, int which)
|
||||
{
|
||||
/* is_read is true if we have just read a ChangeCipherSpec message -
|
||||
* i.e. we need to update the read cipherspec. Otherwise we have just
|
||||
* written one. */
|
||||
const char is_read = (which & SSL3_CC_READ) != 0;
|
||||
/* use_client_keys is true if we wish to use the keys for the "client
|
||||
* write" direction. This is the case if we're a client sending a
|
||||
* ChangeCipherSpec, or a server reading a client's ChangeCipherSpec. */
|
||||
const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE ||
|
||||
which == SSL3_CHANGE_CIPHER_SERVER_READ;
|
||||
const unsigned char *client_write_mac_secret, *server_write_mac_secret, *mac_secret;
|
||||
const unsigned char *client_write_key, *server_write_key, *key;
|
||||
const unsigned char *client_write_iv, *server_write_iv, *iv;
|
||||
const EVP_CIPHER *cipher = s->s3->tmp.new_sym_enc;
|
||||
unsigned key_len, iv_len, mac_secret_len;
|
||||
const unsigned char *key_data;
|
||||
const char is_export = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) != 0;
|
||||
|
||||
/* Reset sequence number to zero. */
|
||||
if (s->version != DTLS1_VERSION)
|
||||
memset(is_read ? s->s3->read_sequence : s->s3->write_sequence, 0, 8);
|
||||
|
||||
/* key_arg is used for SSLv2. We don't need it for TLS. */
|
||||
s->session->key_arg_length = 0;
|
||||
|
||||
mac_secret_len = s->s3->tmp.new_mac_secret_size;
|
||||
|
||||
key_len = EVP_CIPHER_key_length(cipher);
|
||||
if (is_export && key_len > SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher))
|
||||
key_len = SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher);
|
||||
|
||||
if (EVP_CIPHER_mode(cipher) == EVP_CIPH_GCM_MODE)
|
||||
iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
|
||||
else
|
||||
iv_len = EVP_CIPHER_iv_length(cipher);
|
||||
|
||||
key_data = s->s3->tmp.key_block;
|
||||
client_write_mac_secret = key_data; key_data += mac_secret_len;
|
||||
server_write_mac_secret = key_data; key_data += mac_secret_len;
|
||||
client_write_key = key_data; key_data += key_len;
|
||||
server_write_key = key_data; key_data += key_len;
|
||||
client_write_iv = key_data; key_data += iv_len;
|
||||
server_write_iv = key_data; key_data += iv_len;
|
||||
|
||||
if (use_client_keys)
|
||||
{
|
||||
mac_secret = client_write_mac_secret;
|
||||
key = client_write_key;
|
||||
iv = client_write_iv;
|
||||
}
|
||||
else
|
||||
{
|
||||
mac_secret = server_write_mac_secret;
|
||||
key = server_write_key;
|
||||
iv = server_write_iv;
|
||||
}
|
||||
|
||||
if (key_data - s->s3->tmp.key_block != s->s3->tmp.key_block_length)
|
||||
{
|
||||
OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_INTERNAL_ERROR);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!tls1_change_cipher_state_cipher(s, is_read, use_client_keys,
|
||||
mac_secret, mac_secret_len,
|
||||
key, key_len,
|
||||
iv, iv_len)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
int tls1_setup_key_block(SSL *s)
|
||||
@ -565,6 +568,7 @@ int tls1_setup_key_block(SSL *s)
|
||||
SSL_COMP *comp;
|
||||
int mac_type= NID_undef,mac_secret_size=0;
|
||||
int ret=0;
|
||||
int iv_len;
|
||||
|
||||
#ifdef KSSL_DEBUG
|
||||
printf ("tls1_setup_key_block()\n");
|
||||
@ -579,11 +583,16 @@ int tls1_setup_key_block(SSL *s)
|
||||
return(0);
|
||||
}
|
||||
|
||||
if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
|
||||
iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
|
||||
else
|
||||
iv_len = EVP_CIPHER_iv_length(c);
|
||||
|
||||
s->s3->tmp.new_sym_enc=c;
|
||||
s->s3->tmp.new_hash=hash;
|
||||
s->s3->tmp.new_mac_pkey_type = mac_type;
|
||||
s->s3->tmp.new_mac_secret_size = mac_secret_size;
|
||||
num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);
|
||||
num=EVP_CIPHER_key_length(c)+mac_secret_size+iv_len;
|
||||
num*=2;
|
||||
|
||||
ssl3_cleanup_key_block(s);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user