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5616450a4b
wolfssl/src/tls.c
Moisés Guimarães 5616450a4b fixed return codes 
added protection for missing HAVE_TLS_EXTENSIONS
2014-01-31 16:52:15 -03:00

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/* tls.c
*
* Copyright (C) 2006-2013 wolfSSL Inc.
*
* This file is part of CyaSSL.
*
* CyaSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* CyaSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cyassl/ctaocrypt/settings.h>
#include <cyassl/ssl.h>
#include <cyassl/internal.h>
#include <cyassl/error.h>
#include <cyassl/ctaocrypt/hmac.h>
#ifndef NO_TLS
#ifndef min
static INLINE word32 min(word32 a, word32 b)
{
return a > b ? b : a;
}
#endif /* min */
#ifdef CYASSL_SHA384
#define PHASH_MAX_DIGEST_SIZE SHA384_DIGEST_SIZE
#else
#define PHASH_MAX_DIGEST_SIZE SHA256_DIGEST_SIZE
#endif
/* compute p_hash for MD5, SHA-1, SHA-256, or SHA-384 for TLSv1 PRF */
static void p_hash(byte* result, word32 resLen, const byte* secret,
word32 secLen, const byte* seed, word32 seedLen, int hash)
{
word32 len = PHASH_MAX_DIGEST_SIZE;
word32 times;
word32 lastLen;
word32 lastTime;
word32 i;
word32 idx = 0;
byte previous[PHASH_MAX_DIGEST_SIZE]; /* max size */
byte current[PHASH_MAX_DIGEST_SIZE]; /* max size */
Hmac hmac;
switch (hash) {
#ifndef NO_MD5
case md5_mac:
{
len = MD5_DIGEST_SIZE;
hash = MD5;
}
break;
#endif
#ifndef NO_SHA256
case sha256_mac:
{
len = SHA256_DIGEST_SIZE;
hash = SHA256;
}
break;
#endif
#ifdef CYASSL_SHA384
case sha384_mac:
{
len = SHA384_DIGEST_SIZE;
hash = SHA384;
}
break;
#endif
#ifndef NO_SHA
case sha_mac:
default:
{
len = SHA_DIGEST_SIZE;
hash = SHA;
}
break;
#endif
}
times = resLen / len;
lastLen = resLen % len;
if (lastLen) times += 1;
lastTime = times - 1;
HmacSetKey(&hmac, hash, secret, secLen);
HmacUpdate(&hmac, seed, seedLen); /* A0 = seed */
HmacFinal(&hmac, previous); /* A1 */
for (i = 0; i < times; i++) {
HmacUpdate(&hmac, previous, len);
HmacUpdate(&hmac, seed, seedLen);
HmacFinal(&hmac, current);
if ( (i == lastTime) && lastLen)
XMEMCPY(&result[idx], current, min(lastLen, sizeof(current)));
else {
XMEMCPY(&result[idx], current, len);
idx += len;
HmacUpdate(&hmac, previous, len);
HmacFinal(&hmac, previous);
}
}
XMEMSET(previous, 0, sizeof previous);
XMEMSET(current, 0, sizeof current);
XMEMSET(&hmac, 0, sizeof hmac);
}
#ifndef NO_OLD_TLS
/* calculate XOR for TLSv1 PRF */
static INLINE void get_xor(byte *digest, word32 digLen, byte* md5, byte* sha)
{
word32 i;
for (i = 0; i < digLen; i++)
digest[i] = md5[i] ^ sha[i];
}
/* compute TLSv1 PRF (pseudo random function using HMAC) */
static void doPRF(byte* digest, word32 digLen, const byte* secret,word32 secLen,
const byte* label, word32 labLen, const byte* seed, word32 seedLen)
{
word32 half = (secLen + 1) / 2;
byte md5_half[MAX_PRF_HALF]; /* half is real size */
byte sha_half[MAX_PRF_HALF]; /* half is real size */
byte labelSeed[MAX_PRF_LABSEED]; /* labLen + seedLen is real size */
byte md5_result[MAX_PRF_DIG]; /* digLen is real size */
byte sha_result[MAX_PRF_DIG]; /* digLen is real size */
if (half > MAX_PRF_HALF)
return;
if (labLen + seedLen > MAX_PRF_LABSEED)
return;
if (digLen > MAX_PRF_DIG)
return;
XMEMSET(md5_result, 0, digLen);
XMEMSET(sha_result, 0, digLen);
XMEMCPY(md5_half, secret, half);
XMEMCPY(sha_half, secret + half - secLen % 2, half);
XMEMCPY(labelSeed, label, labLen);
XMEMCPY(labelSeed + labLen, seed, seedLen);
p_hash(md5_result, digLen, md5_half, half, labelSeed, labLen + seedLen,
md5_mac);
p_hash(sha_result, digLen, sha_half, half, labelSeed, labLen + seedLen,
sha_mac);
get_xor(digest, digLen, md5_result, sha_result);
}
#endif
/* Wrapper to call straight thru to p_hash in TSL 1.2 cases to remove stack
use */
static void PRF(byte* digest, word32 digLen, const byte* secret, word32 secLen,
const byte* label, word32 labLen, const byte* seed, word32 seedLen,
int useAtLeastSha256, int hash_type)
{
if (useAtLeastSha256) {
byte labelSeed[MAX_PRF_LABSEED]; /* labLen + seedLen is real size */
if (labLen + seedLen > MAX_PRF_LABSEED)
return;
XMEMCPY(labelSeed, label, labLen);
XMEMCPY(labelSeed + labLen, seed, seedLen);
/* If a cipher suite wants an algorithm better than sha256, it
* should use better. */
if (hash_type < sha256_mac)
hash_type = sha256_mac;
p_hash(digest, digLen, secret, secLen, labelSeed, labLen + seedLen,
hash_type);
}
#ifndef NO_OLD_TLS
else
doPRF(digest, digLen, secret, secLen, label, labLen, seed, seedLen);
#endif
}
#ifdef CYASSL_SHA384
#define HSHASH_SZ SHA384_DIGEST_SIZE
#else
#define HSHASH_SZ FINISHED_SZ
#endif
void BuildTlsFinished(CYASSL* ssl, Hashes* hashes, const byte* sender)
{
const byte* side;
byte handshake_hash[HSHASH_SZ];
word32 hashSz = FINISHED_SZ;
#ifndef NO_OLD_TLS
Md5Final(&ssl->hashMd5, handshake_hash);
ShaFinal(&ssl->hashSha, &handshake_hash[MD5_DIGEST_SIZE]);
#endif
if (IsAtLeastTLSv1_2(ssl)) {
#ifndef NO_SHA256
if (ssl->specs.mac_algorithm <= sha256_mac) {
Sha256Final(&ssl->hashSha256, handshake_hash);
hashSz = SHA256_DIGEST_SIZE;
}
#endif
#ifdef CYASSL_SHA384
if (ssl->specs.mac_algorithm == sha384_mac) {
Sha384Final(&ssl->hashSha384, handshake_hash);
hashSz = SHA384_DIGEST_SIZE;
}
#endif
}
if ( XSTRNCMP((const char*)sender, (const char*)client, SIZEOF_SENDER) == 0)
side = tls_client;
else
side = tls_server;
PRF((byte*)hashes, TLS_FINISHED_SZ, ssl->arrays->masterSecret, SECRET_LEN,
side, FINISHED_LABEL_SZ, handshake_hash, hashSz, IsAtLeastTLSv1_2(ssl),
ssl->specs.mac_algorithm);
}
#ifndef NO_OLD_TLS
ProtocolVersion MakeTLSv1(void)
{
ProtocolVersion pv;
pv.major = SSLv3_MAJOR;
pv.minor = TLSv1_MINOR;
return pv;
}
ProtocolVersion MakeTLSv1_1(void)
{
ProtocolVersion pv;
pv.major = SSLv3_MAJOR;
pv.minor = TLSv1_1_MINOR;
return pv;
}
#endif
ProtocolVersion MakeTLSv1_2(void)
{
ProtocolVersion pv;
pv.major = SSLv3_MAJOR;
pv.minor = TLSv1_2_MINOR;
return pv;
}
static const byte master_label[MASTER_LABEL_SZ + 1] = "master secret";
static const byte key_label [KEY_LABEL_SZ + 1] = "key expansion";
int DeriveTlsKeys(CYASSL* ssl)
{
int length = 2 * ssl->specs.hash_size +
2 * ssl->specs.key_size +
2 * ssl->specs.iv_size;
byte seed[SEED_LEN];
byte key_data[MAX_PRF_DIG];
XMEMCPY(seed, ssl->arrays->serverRandom, RAN_LEN);
XMEMCPY(&seed[RAN_LEN], ssl->arrays->clientRandom, RAN_LEN);
PRF(key_data, length, ssl->arrays->masterSecret, SECRET_LEN, key_label,
KEY_LABEL_SZ, seed, SEED_LEN, IsAtLeastTLSv1_2(ssl),
ssl->specs.mac_algorithm);
return StoreKeys(ssl, key_data);
}
int MakeTlsMasterSecret(CYASSL* ssl)
{
byte seed[SEED_LEN];
XMEMCPY(seed, ssl->arrays->clientRandom, RAN_LEN);
XMEMCPY(&seed[RAN_LEN], ssl->arrays->serverRandom, RAN_LEN);
PRF(ssl->arrays->masterSecret, SECRET_LEN,
ssl->arrays->preMasterSecret, ssl->arrays->preMasterSz,
master_label, MASTER_LABEL_SZ,
seed, SEED_LEN, IsAtLeastTLSv1_2(ssl), ssl->specs.mac_algorithm);
#ifdef SHOW_SECRETS
{
int i;
printf("master secret: ");
for (i = 0; i < SECRET_LEN; i++)
printf("%02x", ssl->arrays->masterSecret[i]);
printf("\n");
}
#endif
return DeriveTlsKeys(ssl);
}
/* Used by EAP-TLS and EAP-TTLS to derive keying material from
* the master_secret. */
int CyaSSL_make_eap_keys(CYASSL* ssl, void* msk, unsigned int len,
const char* label)
{
byte seed[SEED_LEN];
/*
* As per RFC-5281, the order of the client and server randoms is reversed
* from that used by the TLS protocol to derive keys.
*/
XMEMCPY(seed, ssl->arrays->clientRandom, RAN_LEN);
XMEMCPY(&seed[RAN_LEN], ssl->arrays->serverRandom, RAN_LEN);
PRF((byte*)msk, len,
ssl->arrays->masterSecret, SECRET_LEN,
(const byte *)label, (word32)strlen(label),
seed, SEED_LEN, IsAtLeastTLSv1_2(ssl), ssl->specs.mac_algorithm);
return 0;
}
/*** next for static INLINE s copied internal.c ***/
/* convert 16 bit integer to opaque */
static INLINE void c16toa(word16 u16, byte* c)
{
c[0] = (u16 >> 8) & 0xff;
c[1] = u16 & 0xff;
}
#ifdef HAVE_TLS_EXTENSIONS
/* convert opaque to 16 bit integer */
static INLINE void ato16(const byte* c, word16* u16)
{
*u16 = (c[0] << 8) | (c[1]);
}
#ifdef HAVE_SNI
/* convert a 24 bit integer into a 32 bit one */
static INLINE void c24to32(const word24 u24, word32* u32)
{
*u32 = (u24[0] << 16) | (u24[1] << 8) | u24[2];
}
#endif
#endif
/* convert 32 bit integer to opaque */
static INLINE void c32toa(word32 u32, byte* c)
{
c[0] = (u32 >> 24) & 0xff;
c[1] = (u32 >> 16) & 0xff;
c[2] = (u32 >> 8) & 0xff;
c[3] = u32 & 0xff;
}
static INLINE word32 GetSEQIncrement(CYASSL* ssl, int verify)
{
#ifdef CYASSL_DTLS
if (ssl->options.dtls) {
if (verify)
return ssl->keys.dtls_state.curSeq; /* explicit from peer */
else
return ssl->keys.dtls_sequence_number - 1; /* already incremented */
}
#endif
if (verify)
return ssl->keys.peer_sequence_number++;
else
return ssl->keys.sequence_number++;
}
#ifdef CYASSL_DTLS
static INLINE word32 GetEpoch(CYASSL* ssl, int verify)
{
if (verify)
return ssl->keys.dtls_state.curEpoch;
else
return ssl->keys.dtls_epoch;
}
#endif /* CYASSL_DTLS */
/*** end copy ***/
/* return HMAC digest type in CyaSSL format */
int CyaSSL_GetHmacType(CYASSL* ssl)
{
if (ssl == NULL)
return BAD_FUNC_ARG;
switch (ssl->specs.mac_algorithm) {
#ifndef NO_MD5
case md5_mac:
{
return MD5;
}
#endif
#ifndef NO_SHA256
case sha256_mac:
{
return SHA256;
}
#endif
#ifdef CYASSL_SHA384
case sha384_mac:
{
return SHA384;
}
#endif
#ifndef NO_SHA
case sha_mac:
{
return SHA;
}
#endif
#ifdef HAVE_BLAKE2
case blake2b_mac:
{
return BLAKE2B_ID;
}
#endif
default:
{
return SSL_FATAL_ERROR;
}
}
}
int CyaSSL_SetTlsHmacInner(CYASSL* ssl, byte* inner, word32 sz, int content,
int verify)
{
if (ssl == NULL || inner == NULL)
return BAD_FUNC_ARG;
XMEMSET(inner, 0, CYASSL_TLS_HMAC_INNER_SZ);
#ifdef CYASSL_DTLS
if (ssl->options.dtls)
c16toa((word16)GetEpoch(ssl, verify), inner);
#endif
c32toa(GetSEQIncrement(ssl, verify), &inner[sizeof(word32)]);
inner[SEQ_SZ] = (byte)content;
inner[SEQ_SZ + ENUM_LEN] = ssl->version.major;
inner[SEQ_SZ + ENUM_LEN + ENUM_LEN] = ssl->version.minor;
c16toa((word16)sz, inner + SEQ_SZ + ENUM_LEN + VERSION_SZ);
return 0;
}
/* TLS type HMAC */
void TLS_hmac(CYASSL* ssl, byte* digest, const byte* in, word32 sz,
int content, int verify)
{
Hmac hmac;
byte myInner[CYASSL_TLS_HMAC_INNER_SZ];
CyaSSL_SetTlsHmacInner(ssl, myInner, sz, content, verify);
HmacSetKey(&hmac, CyaSSL_GetHmacType(ssl), CyaSSL_GetMacSecret(ssl, verify),
ssl->specs.hash_size);
HmacUpdate(&hmac, myInner, sizeof(myInner));
HmacUpdate(&hmac, in, sz); /* content */
HmacFinal(&hmac, digest);
}
#ifdef HAVE_TLS_EXTENSIONS
#define IS_OFF(semaphore, light) \
((semaphore)[(light) / 8] ^ (byte) (0x01 << ((light) % 8)))
#define TURN_ON(semaphore, light) \
((semaphore)[(light) / 8] |= (byte) (0x01 << ((light) % 8)))
static int TLSX_Append(TLSX** list, TLSX_Type type)
{
TLSX* extension;
if (list == NULL) /* won't check type since this function is static */
return BAD_FUNC_ARG;
if ((extension = XMALLOC(sizeof(TLSX), 0, DYNAMIC_TYPE_TLSX)) == NULL)
return MEMORY_E;
extension->type = type;
extension->data = NULL;
extension->resp = 0;
extension->next = *list;
*list = extension;
return 0;
}
#ifndef NO_CYASSL_SERVER
void TLSX_SetResponse(CYASSL* ssl, TLSX_Type type);
void TLSX_SetResponse(CYASSL* ssl, TLSX_Type type)
{
TLSX *ext = TLSX_Find(ssl->extensions, type);
if (ext)
ext->resp = 1;
}
#endif
/* SNI - Server Name Indication */
#ifdef HAVE_SNI
static void TLSX_SNI_Free(SNI* sni)
{
if (sni) {
switch (sni->type) {
case CYASSL_SNI_HOST_NAME:
XFREE(sni->data.host_name, 0, DYNAMIC_TYPE_TLSX);
break;
}
XFREE(sni, 0, DYNAMIC_TYPE_TLSX);
}
}
static void TLSX_SNI_FreeAll(SNI* list)
{
SNI* sni;
while ((sni = list)) {
list = sni->next;
TLSX_SNI_Free(sni);
}
}
static int TLSX_SNI_Append(SNI** list, byte type, const void* data, word16 size)
{
SNI* sni;
if (list == NULL)
return BAD_FUNC_ARG;
if ((sni = XMALLOC(sizeof(SNI), 0, DYNAMIC_TYPE_TLSX)) == NULL)
return MEMORY_E;
switch (type) {
case CYASSL_SNI_HOST_NAME: {
sni->data.host_name = XMALLOC(size + 1, 0, DYNAMIC_TYPE_TLSX);
if (sni->data.host_name) {
XSTRNCPY(sni->data.host_name, (const char*) data, size);
sni->data.host_name[size] = 0;
} else {
XFREE(sni, 0, DYNAMIC_TYPE_TLSX);
return MEMORY_E;
}
}
break;
default: /* invalid type */
XFREE(sni, 0, DYNAMIC_TYPE_TLSX);
return BAD_FUNC_ARG;
break;
}
sni->type = type;
sni->next = *list;
#ifndef NO_CYASSL_SERVER
sni->options = 0;
sni->status = CYASSL_SNI_NO_MATCH;
#endif
*list = sni;
return 0;
}
static word16 TLSX_SNI_GetSize(SNI* list)
{
SNI* sni;
word16 length = OPAQUE16_LEN; /* list length */
while ((sni = list)) {
list = sni->next;
length += ENUM_LEN + OPAQUE16_LEN; /* sni type + sni length */
switch (sni->type) {
case CYASSL_SNI_HOST_NAME:
length += XSTRLEN((char*) sni->data.host_name);
break;
}
}
return length;
}
static word16 TLSX_SNI_Write(SNI* list, byte* output)
{
SNI* sni;
word16 length = 0;
word16 offset = OPAQUE16_LEN; /* list length offset */
while ((sni = list)) {
list = sni->next;
output[offset++] = sni->type; /* sni type */
switch (sni->type) {
case CYASSL_SNI_HOST_NAME:
length = XSTRLEN((char*) sni->data.host_name);
c16toa(length, output + offset); /* sni length */
offset += OPAQUE16_LEN;
XMEMCPY(output + offset, sni->data.host_name, length);
offset += length;
break;
}
}
c16toa(offset - OPAQUE16_LEN, output); /* writing list length */
return offset;
}
static SNI* TLSX_SNI_Find(SNI *list, byte type)
{
SNI *sni = list;
while (sni && sni->type != type)
sni = sni->next;
return sni;
}
#ifndef NO_CYASSL_SERVER
static void TLSX_SNI_SetStatus(TLSX* extensions, byte type, byte status)
{
TLSX* extension = TLSX_Find(extensions, SERVER_NAME_INDICATION);
SNI* sni = TLSX_SNI_Find(extension ? extension->data : NULL, type);
if (sni) {
sni->status = status;
CYASSL_MSG("SNI did match!");
}
}
byte TLSX_SNI_Status(TLSX* extensions, byte type)
{
TLSX* extension = TLSX_Find(extensions, SERVER_NAME_INDICATION);
SNI* sni = TLSX_SNI_Find(extension ? extension->data : NULL, type);
if (sni)
return sni->status;
return 0;
}
#endif
static int TLSX_SNI_Parse(CYASSL* ssl, byte* input, word16 length,
byte isRequest)
{
#ifndef NO_CYASSL_SERVER
word16 size = 0;
word16 offset = 0;
#endif
TLSX *extension = TLSX_Find(ssl->extensions, SERVER_NAME_INDICATION);
if (!extension)
extension = TLSX_Find(ssl->ctx->extensions, SERVER_NAME_INDICATION);
if (!extension || !extension->data) {
if (!isRequest) {
CYASSL_MSG("Unexpected SNI response from server");
}
return 0; /* not using SNI */
}
if (!isRequest) {
if (length) {
CYASSL_MSG("SNI response should be empty!");
}
return 0; /* nothing to do */
}
#ifndef NO_CYASSL_SERVER
if (OPAQUE16_LEN > length)
return INCOMPLETE_DATA;
ato16(input, &size);
offset += OPAQUE16_LEN;
/* validating sni list length */
if (length != OPAQUE16_LEN + size)
return INCOMPLETE_DATA;
for (size = 0; offset < length; offset += size) {
SNI *sni;
byte type = input[offset++];
if (offset + OPAQUE16_LEN > length)
return INCOMPLETE_DATA;
ato16(input + offset, &size);
offset += OPAQUE16_LEN;
if (offset + size > length)
return INCOMPLETE_DATA;
if (!(sni = TLSX_SNI_Find((SNI *) extension->data, type))) {
continue; /* not using this SNI type */
}
switch(type) {
case CYASSL_SNI_HOST_NAME: {
byte matched = (XSTRLEN(sni->data.host_name) == size)
&& (XSTRNCMP(sni->data.host_name,
(const char *) input + offset, size) == 0);
if (matched || sni->options & CYASSL_SNI_ANSWER_ON_MISMATCH) {
int r = TLSX_UseSNI(&ssl->extensions,
type, input + offset, size);
if (r != SSL_SUCCESS) return r; /* throw error */
TLSX_SNI_SetStatus(ssl->extensions, type,
matched ? CYASSL_SNI_REAL_MATCH : CYASSL_SNI_FAKE_MATCH);
} else if (!(sni->options & CYASSL_SNI_CONTINUE_ON_MISMATCH)) {
SendAlert(ssl, alert_fatal, unrecognized_name);
return UNKNOWN_SNI_HOST_NAME_E;
}
break;
}
}
TLSX_SetResponse(ssl, SERVER_NAME_INDICATION);
}
#endif
return 0;
}
int TLSX_UseSNI(TLSX** extensions, byte type, const void* data, word16 size)
{
TLSX* extension = NULL;
SNI* sni = NULL;
int ret = 0;
if (extensions == NULL || data == NULL)
return BAD_FUNC_ARG;
if ((ret = TLSX_SNI_Append(&sni, type, data, size)) != 0)
return ret;
extension = *extensions;
/* find SNI extension if it already exists. */
while (extension && extension->type != SERVER_NAME_INDICATION)
extension = extension->next;
/* push new SNI extension if it doesn't exists. */
if (!extension) {
if ((ret = TLSX_Append(extensions, SERVER_NAME_INDICATION)) != 0) {
TLSX_SNI_Free(sni);
return ret;
}
extension = *extensions;
}
/* push new SNI object to extension data. */
sni->next = (SNI*) extension->data;
extension->data = (void*) sni;
/* look for another server name of the same type to remove (replacement) */
do {
if (sni->next && sni->next->type == type) {
SNI *next = sni->next;
sni->next = next->next;
TLSX_SNI_Free(next);
break;
}
} while ((sni = sni->next));
return SSL_SUCCESS;
}
#ifndef NO_CYASSL_SERVER
word16 TLSX_SNI_GetRequest(TLSX* extensions, byte type, void** data)
{
TLSX* extension = TLSX_Find(extensions, SERVER_NAME_INDICATION);
SNI* sni = TLSX_SNI_Find(extension ? extension->data : NULL, type);
if (sni && sni->status != CYASSL_SNI_NO_MATCH) {
switch (sni->type) {
case CYASSL_SNI_HOST_NAME:
*data = sni->data.host_name;
return XSTRLEN(*data);
}
}
return 0;
}
void TLSX_SNI_SetOptions(TLSX* extensions, byte type, byte options)
{
TLSX* extension = TLSX_Find(extensions, SERVER_NAME_INDICATION);
SNI* sni = TLSX_SNI_Find(extension ? extension->data : NULL, type);
if (sni)
sni->options = options;
}
int TLSX_SNI_GetFromBuffer(const byte* clientHello, word32 helloSz,
byte type, byte* sni, word32* inOutSz)
{
word32 offset = 0;
word32 len32 = 0;
word16 len16 = 0;
if (helloSz < RECORD_HEADER_SZ + HANDSHAKE_HEADER_SZ + CLIENT_HELLO_FIRST)
return INCOMPLETE_DATA;
/* TLS record header */
if ((enum ContentType) clientHello[offset++] != handshake)
return BUFFER_ERROR;
if (clientHello[offset++] != SSLv3_MAJOR)
return BUFFER_ERROR;
if (clientHello[offset++] < TLSv1_MINOR)
return BUFFER_ERROR;
ato16(clientHello + offset, &len16);
offset += OPAQUE16_LEN;
if (offset + len16 > helloSz)
return INCOMPLETE_DATA;
/* Handshake header */
if ((enum HandShakeType) clientHello[offset] != client_hello)
return BUFFER_ERROR;
c24to32(clientHello + offset + 1, &len32);
offset += HANDSHAKE_HEADER_SZ;
if (offset + len32 > helloSz)
return INCOMPLETE_DATA;
/* client hello */
offset += VERSION_SZ + RAN_LEN; /* version, random */
if (helloSz < offset + clientHello[offset])
return INCOMPLETE_DATA;
offset += ENUM_LEN + clientHello[offset]; /* skip session id */
/* cypher suites */
if (helloSz < offset + OPAQUE16_LEN)
return INCOMPLETE_DATA;
ato16(clientHello + offset, &len16);
offset += OPAQUE16_LEN;
if (helloSz < offset + len16)
return INCOMPLETE_DATA;
offset += len16; /* skip cypher suites */
/* compression methods */
if (helloSz < offset + 1)
return INCOMPLETE_DATA;
if (helloSz < offset + clientHello[offset])
return INCOMPLETE_DATA;
offset += ENUM_LEN + clientHello[offset]; /* skip compression methods */
/* extensions */
if (helloSz < offset + OPAQUE16_LEN)
return 0; /* no extensions in client hello. */
ato16(clientHello + offset, &len16);
offset += OPAQUE16_LEN;
if (helloSz < offset + len16)
return INCOMPLETE_DATA;
while (len16 > OPAQUE16_LEN + OPAQUE16_LEN) {
word16 extType;
word16 extLen;
ato16(clientHello + offset, &extType);
offset += OPAQUE16_LEN;
ato16(clientHello + offset, &extLen);
offset += OPAQUE16_LEN;
if (helloSz < offset + extLen)
return INCOMPLETE_DATA;
if (extType != SERVER_NAME_INDICATION) {
offset += extLen; /* skip extension */
} else {
word16 listLen;
ato16(clientHello + offset, &listLen);
offset += OPAQUE16_LEN;
if (helloSz < offset + listLen)
return INCOMPLETE_DATA;
while (listLen > ENUM_LEN + OPAQUE16_LEN) {
byte sniType = clientHello[offset++];
word16 sniLen;
ato16(clientHello + offset, &sniLen);
offset += OPAQUE16_LEN;
if (helloSz < offset + sniLen)
return INCOMPLETE_DATA;
if (sniType != type) {
offset += sniLen;
listLen -= min(ENUM_LEN + OPAQUE16_LEN + sniLen, listLen);
continue;
}
*inOutSz = min(sniLen, *inOutSz);
XMEMCPY(sni, clientHello + offset, *inOutSz);
return SSL_SUCCESS;
}
}
len16 -= min(2 * OPAQUE16_LEN + extLen, len16);
}
return len16 ? BUFFER_ERROR : SSL_SUCCESS;
}
#endif
#define SNI_FREE_ALL TLSX_SNI_FreeAll
#define SNI_GET_SIZE TLSX_SNI_GetSize
#define SNI_WRITE TLSX_SNI_Write
#define SNI_PARSE TLSX_SNI_Parse
#else
#define SNI_FREE_ALL(list)
#define SNI_GET_SIZE(list) 0
#define SNI_WRITE(a, b) 0
#define SNI_PARSE(a, b, c, d) 0
#endif /* HAVE_SNI */
#ifdef HAVE_MAX_FRAGMENT
static word16 TLSX_MFL_Write(byte* data, byte* output)
{
output[0] = data[0];
return ENUM_LEN;
}
static int TLSX_MFL_Parse(CYASSL* ssl, byte* input, word16 length,
byte isRequest)
{
if (length != ENUM_LEN)
return INCOMPLETE_DATA;
switch (*input) {
case CYASSL_MFL_2_9 : ssl->max_fragment = 512; break;
case CYASSL_MFL_2_10: ssl->max_fragment = 1024; break;
case CYASSL_MFL_2_11: ssl->max_fragment = 2048; break;
case CYASSL_MFL_2_12: ssl->max_fragment = 4096; break;
case CYASSL_MFL_2_13: ssl->max_fragment = 8192; break;
default:
SendAlert(ssl, alert_fatal, illegal_parameter);
return UNKNOWN_MAX_FRAG_LEN_E;
}
#ifndef NO_CYASSL_SERVER
if (isRequest) {
int r = TLSX_UseMaxFragment(&ssl->extensions, *input);
if (r != SSL_SUCCESS) return r; /* throw error */
TLSX_SetResponse(ssl, MAX_FRAGMENT_LENGTH);
}
#endif
return 0;
}
int TLSX_UseMaxFragment(TLSX** extensions, byte mfl)
{
TLSX* extension = NULL;
byte* data = NULL;
int ret = 0;
if (extensions == NULL)
return BAD_FUNC_ARG;
if (mfl < CYASSL_MFL_2_9 || CYASSL_MFL_2_13 < mfl)
return BAD_FUNC_ARG;
if ((data = XMALLOC(ENUM_LEN, 0, DYNAMIC_TYPE_TLSX)) == NULL)
return MEMORY_E;
data[0] = mfl;
/* push new MFL extension. */
if ((ret = TLSX_Append(extensions, MAX_FRAGMENT_LENGTH)) != 0) {
XFREE(data, 0, DYNAMIC_TYPE_TLSX);
return ret;
}
/* place new mfl to extension data. */
extension = *extensions;
extension->data = (void*) data;
/* remove duplicated extensions */
do {
if (extension->next && extension->next->type == MAX_FRAGMENT_LENGTH) {
TLSX *next = extension->next;
extension->next = next->next;
next->next = NULL;
TLSX_FreeAll(next);
break;
}
} while ((extension = extension->next));
return SSL_SUCCESS;
}
#define MFL_FREE_ALL(data) XFREE(data, 0, DYNAMIC_TYPE_TLSX)
#define MFL_GET_SIZE(data) ENUM_LEN
#define MFL_WRITE TLSX_MFL_Write
#define MFL_PARSE TLSX_MFL_Parse
#else
#define MFL_FREE_ALL(a)
#define MFL_GET_SIZE(a) 0
#define MFL_WRITE(a, b) 0
#define MFL_PARSE(a, b, c, d) 0
#endif /* HAVE_MAX_FRAGMENT */
#ifdef HAVE_TRUNCATED_HMAC
int TLSX_UseTruncatedHMAC(TLSX** extensions)
{
int ret = 0;
if (extensions == NULL)
return BAD_FUNC_ARG;
if (!TLSX_Find(*extensions, TRUNCATED_HMAC))
if ((ret = TLSX_Append(extensions, TRUNCATED_HMAC)) != 0)
return ret;
return SSL_SUCCESS;
}
static int TLSX_THM_Parse(CYASSL* ssl, byte* input, word16 length,
byte isRequest)
{
if (length != 0 || input == NULL)
return INCOMPLETE_DATA;
#ifndef NO_CYASSL_SERVER
if (isRequest) {
int r = TLSX_UseTruncatedHMAC(&ssl->extensions);
if (r != SSL_SUCCESS) return r; /* throw error */
TLSX_SetResponse(ssl, TRUNCATED_HMAC);
}
#endif
ssl->truncated_hmac = 1;
return 0;
}
#define THM_PARSE TLSX_THM_Parse
#else
#define THM_PARSE(a, b, c, d) 0
#endif /* HAVE_TRUNCATED_HMAC */
#ifdef HAVE_ELLIPTIC_CURVES
#ifndef HAVE_ECC
#error "Elliptic Curves Extension requires Elliptic Curve Cryptography. \
Use --enable-ecc in the configure script or define HAVE_ECC."
#endif
static void TLSX_EllipticCurve_FreeAll(EllipticCurve* list)
{
EllipticCurve* curve;
while ((curve = list)) {
list = curve->next;
XFREE(curve, 0, DYNAMIC_TYPE_TLSX);
}
}
static int TLSX_EllipticCurve_Append(EllipticCurve** list, word16 name)
{
EllipticCurve* curve;
if (list == NULL)
return BAD_FUNC_ARG;
if ((curve = XMALLOC(sizeof(EllipticCurve), 0, DYNAMIC_TYPE_TLSX)) == NULL)
return MEMORY_E;
curve->name = name;
curve->next = *list;
*list = curve;
return 0;
}
#ifndef NO_CYASSL_CLIENT
static void TLSX_EllipticCurve_ValidateRequest(CYASSL* ssl, byte* semaphore)
{
int i;
for (i = 0; i < ssl->suites->suiteSz; i+= 2)
if (ssl->suites->suites[i] == ECC_BYTE)
return;
/* No elliptic curve suite found */
TURN_ON(semaphore, ELLIPTIC_CURVES);
}
static word16 TLSX_EllipticCurve_GetSize(EllipticCurve* list)
{
EllipticCurve* curve;
word16 length = OPAQUE16_LEN; /* list length */
while ((curve = list)) {
list = curve->next;
length += OPAQUE16_LEN; /* curve length */
}
return length;
}
static word16 TLSX_EllipticCurve_WriteR(EllipticCurve* curve, byte* output);
static word16 TLSX_EllipticCurve_WriteR(EllipticCurve* curve, byte* output)
{
word16 offset = 0;
if (!curve)
return offset;
offset = TLSX_EllipticCurve_WriteR(curve->next, output);
c16toa(curve->name, output + offset);
return OPAQUE16_LEN + offset;
}
static word16 TLSX_EllipticCurve_Write(EllipticCurve* list, byte* output)
{
word16 length = TLSX_EllipticCurve_WriteR(list, output + OPAQUE16_LEN);
c16toa(length, output); /* writing list length */
return OPAQUE16_LEN + length;
}
#endif /* NO_CYASSL_CLIENT */
#ifndef NO_CYASSL_SERVER
static int TLSX_EllipticCurve_Parse(CYASSL* ssl, byte* input, word16 length,
byte isRequest)
{
word16 offset;
word16 name;
int r;
(void) isRequest; /* shut up compiler! */
if (OPAQUE16_LEN > length || length % OPAQUE16_LEN)
return INCOMPLETE_DATA;
ato16(input, &offset);
/* validating curve list length */
if (length != OPAQUE16_LEN + offset)
return INCOMPLETE_DATA;
while (offset) {
ato16(input + offset, &name);
offset -= OPAQUE16_LEN;
r = TLSX_UseEllipticCurve(&ssl->extensions, name);
if (r) return r; /* throw error */
}
return 0;
}
int TLSX_ValidateEllipticCurves(CYASSL* ssl, byte first, byte second) {
TLSX* extension = (first == ECC_BYTE)
? TLSX_Find(ssl->extensions, ELLIPTIC_CURVES)
: NULL;
EllipticCurve* curve = NULL;
word32 oid = 0;
word16 octets = 0; /* acording to 'ecc_set_type ecc_sets[];' */
int sig = 0; /* valitade signature */
int key = 0; /* validate key */
if (!extension)
return 1; /* no suite restriction */
for (curve = extension->data; curve && !(sig && key); curve = curve->next) {
switch (curve->name) {
case CYASSL_ECC_SECP160R1: oid = ECC_160R1; octets = 20; break;
case CYASSL_ECC_SECP192R1: oid = ECC_192R1; octets = 24; break;
case CYASSL_ECC_SECP224R1: oid = ECC_224R1; octets = 28; break;
case CYASSL_ECC_SECP256R1: oid = ECC_256R1; octets = 32; break;
case CYASSL_ECC_SECP384R1: oid = ECC_384R1; octets = 48; break;
case CYASSL_ECC_SECP521R1: oid = ECC_521R1; octets = 66; break;
}
switch (second) {
#ifndef NO_DSA
/* ECDHE_ECDSA */
case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA:
case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA:
case TLS_ECDHE_ECDSA_WITH_RC4_128_SHA:
case TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA:
case TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256:
case TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384:
case TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:
case TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384:
case TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8:
case TLS_ECDHE_ECDSA_WITH_AES_256_CCM_8:
sig |= ssl->pkCurveOID == oid;
key |= ssl->eccTempKeySz == octets;
break;
/* ECDH_ECDSA */
case TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA:
case TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA:
case TLS_ECDH_ECDSA_WITH_RC4_128_SHA:
case TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA:
case TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256:
case TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384:
case TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256:
case TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384:
sig |= ssl->pkCurveOID == oid;
key |= ssl->pkCurveOID == oid;
break;
#endif
#ifndef NO_RSA
/* ECDHE_RSA */
case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:
case TLS_ECDHE_RSA_WITH_RC4_128_SHA:
case TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA:
case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384:
case TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:
case TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:
sig = 1;
key |= ssl->eccTempKeySz == octets;
break;
/* ECDH_RSA */
case TLS_ECDH_RSA_WITH_AES_256_CBC_SHA:
case TLS_ECDH_RSA_WITH_AES_128_CBC_SHA:
case TLS_ECDH_RSA_WITH_RC4_128_SHA:
case TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA:
case TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256:
case TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384:
case TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256:
case TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384:
sig = 1;
key |= ssl->pkCurveOID == oid;
break;
#endif
default:
sig = 1;
key = 1;
break;
}
}
return sig && key;
}
#endif /* NO_CYASSL_SERVER */
int TLSX_UseEllipticCurve(TLSX** extensions, word16 name)
{
TLSX* extension = NULL;
EllipticCurve* curve = NULL;
int ret = 0;
if (extensions == NULL)
return BAD_FUNC_ARG;
switch (name) {
case CYASSL_ECC_SECP160R1:
case CYASSL_ECC_SECP192R1:
case CYASSL_ECC_SECP224R1:
case CYASSL_ECC_SECP256R1:
case CYASSL_ECC_SECP384R1:
case CYASSL_ECC_SECP521R1:
break;
default:
return BAD_FUNC_ARG;
}
if ((ret = TLSX_EllipticCurve_Append(&curve, name)) != 0)
return ret;
extension = *extensions;
/* find EllipticCurve extension if it already exists. */
while (extension && extension->type != ELLIPTIC_CURVES)
extension = extension->next;
/* push new EllipticCurve extension if it doesn't exists. */
if (!extension) {
if ((ret = TLSX_Append(extensions, ELLIPTIC_CURVES)) != 0) {
XFREE(curve, 0, DYNAMIC_TYPE_TLSX);
return ret;
}
extension = *extensions;
}
/* push new EllipticCurve object to extension data. */
curve->next = (EllipticCurve*) extension->data;
extension->data = (void*) curve;
/* look for another curve of the same name to remove (replacement) */
do {
if (curve->next && curve->next->name == name) {
EllipticCurve *next = curve->next;
curve->next = next->next;
XFREE(next, 0, DYNAMIC_TYPE_TLSX);
break;
}
} while ((curve = curve->next));
return SSL_SUCCESS;
}
#define EC_FREE_ALL TLSX_EllipticCurve_FreeAll
#define EC_VALIDATE_REQUEST TLSX_EllipticCurve_ValidateRequest
#ifndef NO_CYASSL_CLIENT
#define EC_GET_SIZE TLSX_EllipticCurve_GetSize
#define EC_WRITE TLSX_EllipticCurve_Write
#else
#define EC_GET_SIZE(list) 0
#define EC_WRITE(a, b) 0
#endif
#ifndef NO_CYASSL_SERVER
#define EC_PARSE TLSX_EllipticCurve_Parse
#else
#define EC_PARSE(a, b, c, d) 0
#endif
#else
#define EC_FREE_ALL(list)
#define EC_GET_SIZE(list) 0
#define EC_WRITE(a, b) 0
#define EC_PARSE(a, b, c, d) 0
#define EC_VALIDATE_REQUEST(a, b)
#endif /* HAVE_ELLIPTIC_CURVES */
TLSX* TLSX_Find(TLSX* list, TLSX_Type type)
{
TLSX* extension = list;
while (extension && extension->type != type)
extension = extension->next;
return extension;
}
void TLSX_FreeAll(TLSX* list)
{
TLSX* extension;
while ((extension = list)) {
list = extension->next;
switch (extension->type) {
case SERVER_NAME_INDICATION:
SNI_FREE_ALL((SNI *) extension->data);
break;
case MAX_FRAGMENT_LENGTH:
MFL_FREE_ALL(extension->data);
break;
case TRUNCATED_HMAC:
/* Nothing to do. */
break;
case ELLIPTIC_CURVES:
EC_FREE_ALL(extension->data);
break;
}
XFREE(extension, 0, DYNAMIC_TYPE_TLSX);
}
}
static word16 TLSX_GetSize(TLSX* list, byte* semaphore, byte isRequest)
{
TLSX* extension;
word16 length = 0;
while ((extension = list)) {
list = extension->next;
if (!isRequest && !extension->resp)
continue; /* skip! */
if (IS_OFF(semaphore, extension->type)) {
/* type + data length */
length += HELLO_EXT_TYPE_SZ + OPAQUE16_LEN;
switch (extension->type) {
case SERVER_NAME_INDICATION:
if (isRequest)
length += SNI_GET_SIZE((SNI *) extension->data);
break;
case MAX_FRAGMENT_LENGTH:
length += MFL_GET_SIZE(extension->data);
break;
case TRUNCATED_HMAC:
/* empty extension. */
break;
case ELLIPTIC_CURVES:
length += EC_GET_SIZE((EllipticCurve *) extension->data);
break;
}
TURN_ON(semaphore, extension->type);
}
}
return length;
}
static word16 TLSX_Write(TLSX* list, byte* output, byte* semaphore,
byte isRequest)
{
TLSX* extension;
word16 offset = 0;
word16 length_offset = 0;
while ((extension = list)) {
list = extension->next;
if (!isRequest && !extension->resp)
continue; /* skip! */
if (IS_OFF(semaphore, extension->type)) {
/* extension type */
c16toa(extension->type, output + offset);
offset += HELLO_EXT_TYPE_SZ + OPAQUE16_LEN;
length_offset = offset;
/* extension data should be written internally */
switch (extension->type) {
case SERVER_NAME_INDICATION:
if (isRequest)
offset += SNI_WRITE((SNI *) extension->data,
output + offset);
break;
case MAX_FRAGMENT_LENGTH:
offset += MFL_WRITE((byte *) extension->data,
output + offset);
break;
case TRUNCATED_HMAC:
/* empty extension. */
break;
case ELLIPTIC_CURVES:
offset += EC_WRITE((EllipticCurve *) extension->data,
output + offset);
break;
}
/* writing extension data length */
c16toa(offset - length_offset,
output + length_offset - OPAQUE16_LEN);
TURN_ON(semaphore, extension->type);
}
}
return offset;
}
#ifndef NO_CYASSL_CLIENT
word16 TLSX_GetRequestSize(CYASSL* ssl)
{
word16 length = 0;
if (ssl && IsTLS(ssl)) {
byte semaphore[16] = {0};
EC_VALIDATE_REQUEST(ssl, semaphore);
if (ssl->extensions)
length += TLSX_GetSize(ssl->extensions, semaphore, 1);
if (ssl->ctx && ssl->ctx->extensions)
length += TLSX_GetSize(ssl->ctx->extensions, semaphore, 1);
if (IsAtLeastTLSv1_2(ssl) && ssl->suites->hashSigAlgoSz)
length += ssl->suites->hashSigAlgoSz + HELLO_EXT_LEN;
}
if (length)
length += OPAQUE16_LEN; /* for total length storage */
return length;
}
word16 TLSX_WriteRequest(CYASSL* ssl, byte* output)
{
word16 offset = 0;
if (ssl && IsTLS(ssl) && output) {
byte semaphore[16] = {0};
offset += OPAQUE16_LEN; /* extensions length */
EC_VALIDATE_REQUEST(ssl, semaphore);
if (ssl->extensions)
offset += TLSX_Write(ssl->extensions, output + offset,
semaphore, 1);
if (ssl->ctx && ssl->ctx->extensions)
offset += TLSX_Write(ssl->ctx->extensions, output + offset,
semaphore, 1);
if (IsAtLeastTLSv1_2(ssl) && ssl->suites->hashSigAlgoSz)
{
int i;
/* extension type */
c16toa(HELLO_EXT_SIG_ALGO, output + offset);
offset += HELLO_EXT_TYPE_SZ;
/* extension data length */
c16toa(OPAQUE16_LEN + ssl->suites->hashSigAlgoSz, output + offset);
offset += OPAQUE16_LEN;
/* sig algos length */
c16toa(ssl->suites->hashSigAlgoSz, output + offset);
offset += OPAQUE16_LEN;
/* sig algos */
for (i = 0; i < ssl->suites->hashSigAlgoSz; i++, offset++)
output[offset] = ssl->suites->hashSigAlgo[i];
}
if (offset > OPAQUE16_LEN)
c16toa(offset - OPAQUE16_LEN, output); /* extensions length */
}
return offset;
}
#endif /* NO_CYASSL_CLIENT */
#ifndef NO_CYASSL_SERVER
word16 TLSX_GetResponseSize(CYASSL* ssl)
{
word16 length = 0;
byte semaphore[16] = {0};
if (ssl && IsTLS(ssl))
length += TLSX_GetSize(ssl->extensions, semaphore, 0);
/* All the response data is set at the ssl object only, so no ctx here. */
if (length)
length += OPAQUE16_LEN; /* for total length storage */
return length;
}
word16 TLSX_WriteResponse(CYASSL *ssl, byte* output)
{
word16 offset = 0;
if (ssl && IsTLS(ssl) && output) {
byte semaphore[16] = {0};
offset += OPAQUE16_LEN; /* extensions length */
offset += TLSX_Write(ssl->extensions, output + offset, semaphore, 0);
if (offset > OPAQUE16_LEN)
c16toa(offset - OPAQUE16_LEN, output); /* extensions length */
}
return offset;
}
#endif /* NO_CYASSL_SERVER */
int TLSX_Parse(CYASSL* ssl, byte* input, word16 length, byte isRequest,
Suites *suites)
{
int ret = 0;
word16 offset = 0;
if (!ssl || !input || !suites)
return BAD_FUNC_ARG;
while (ret == 0 && offset < length) {
word16 type;
word16 size;
if (length - offset < HELLO_EXT_TYPE_SZ + OPAQUE16_LEN)
return INCOMPLETE_DATA;
ato16(input + offset, &type);
offset += HELLO_EXT_TYPE_SZ;
ato16(input + offset, &size);
offset += OPAQUE16_LEN;
if (offset + size > length)
return INCOMPLETE_DATA;
switch (type) {
case SERVER_NAME_INDICATION:
CYASSL_MSG("SNI extension received");
ret = SNI_PARSE(ssl, input + offset, size, isRequest);
break;
case MAX_FRAGMENT_LENGTH:
CYASSL_MSG("Max Fragment Length extension received");
ret = MFL_PARSE(ssl, input + offset, size, isRequest);
break;
case TRUNCATED_HMAC:
CYASSL_MSG("Truncated HMAC extension received");
ret = THM_PARSE(ssl, input + offset, size, isRequest);
break;
case ELLIPTIC_CURVES:
CYASSL_MSG("Elliptic Curves extension received");
ret = EC_PARSE(ssl, input + offset, size, isRequest);
break;
case HELLO_EXT_SIG_ALGO:
if (isRequest) {
/* do not mess with offset inside the switch! */
if (IsAtLeastTLSv1_2(ssl)) {
ato16(input + offset, &suites->hashSigAlgoSz);
if (suites->hashSigAlgoSz > size - OPAQUE16_LEN)
return INCOMPLETE_DATA;
XMEMCPY(suites->hashSigAlgo,
input + offset + OPAQUE16_LEN,
min(suites->hashSigAlgoSz,
HELLO_EXT_SIGALGO_MAX));
}
} else {
CYASSL_MSG("Servers MUST NOT send SIG ALGO extension.");
}
break;
}
/* offset should be updated here! */
offset += size;
}
return ret;
}
/* undefining semaphore macros */
#undef IS_OFF
#undef TURN_ON
#elif defined(HAVE_SNI) \
|| defined(HAVE_MAX_FRAGMENT) \
|| defined(HAVE_TRUNCATED_HMAC) \
|| defined(HAVE_ELLIPTIC_CURVES)
#error "Using TLS extensions requires HAVE_TLS_EXTENSIONS to be defined."
#endif /* HAVE_TLS_EXTENSIONS */
#ifndef NO_CYASSL_CLIENT
#ifndef NO_OLD_TLS
CYASSL_METHOD* CyaTLSv1_client_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method)
InitSSL_Method(method, MakeTLSv1());
return method;
}
CYASSL_METHOD* CyaTLSv1_1_client_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method)
InitSSL_Method(method, MakeTLSv1_1());
return method;
}
#endif /* !NO_OLD_TLS */
#ifndef NO_SHA256 /* can't use without SHA256 */
CYASSL_METHOD* CyaTLSv1_2_client_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method)
InitSSL_Method(method, MakeTLSv1_2());
return method;
}
#endif
CYASSL_METHOD* CyaSSLv23_client_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method) {
#ifndef NO_SHA256 /* 1.2 requires SHA256 */
InitSSL_Method(method, MakeTLSv1_2());
#else
InitSSL_Method(method, MakeTLSv1_1());
#endif
#ifndef NO_OLD_TLS
method->downgrade = 1;
#endif
}
return method;
}
#endif /* NO_CYASSL_CLIENT */
#ifndef NO_CYASSL_SERVER
#ifndef NO_OLD_TLS
CYASSL_METHOD* CyaTLSv1_server_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method) {
InitSSL_Method(method, MakeTLSv1());
method->side = CYASSL_SERVER_END;
}
return method;
}
CYASSL_METHOD* CyaTLSv1_1_server_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method) {
InitSSL_Method(method, MakeTLSv1_1());
method->side = CYASSL_SERVER_END;
}
return method;
}
#endif /* !NO_OLD_TLS */
#ifndef NO_SHA256 /* can't use without SHA256 */
CYASSL_METHOD* CyaTLSv1_2_server_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method) {
InitSSL_Method(method, MakeTLSv1_2());
method->side = CYASSL_SERVER_END;
}
return method;
}
#endif
CYASSL_METHOD* CyaSSLv23_server_method(void)
{
CYASSL_METHOD* method =
(CYASSL_METHOD*) XMALLOC(sizeof(CYASSL_METHOD), 0,
DYNAMIC_TYPE_METHOD);
if (method) {
#ifndef NO_SHA256 /* 1.2 requires SHA256 */
InitSSL_Method(method, MakeTLSv1_2());
#else
InitSSL_Method(method, MakeTLSv1_1());
#endif
method->side = CYASSL_SERVER_END;
#ifndef NO_OLD_TLS
method->downgrade = 1;
#endif /* !NO_OLD_TLS */
}
return method;
}
#endif /* NO_CYASSL_SERVER */
#endif /* NO_TLS */
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