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Merge pull request #2285 from SparkiDev/tlsx_len

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Better checking of return values in TLSX for error codes.
This commit is contained in:
David Garske
2019-06-20 10:10:31 -07:00
committed by GitHub
parent 19cb31d429 e7b3b31d9f
commit 2460effb0b
3 changed files with 131 additions and 79 deletions
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182
src/tls.c
View File

@@ -5079,7 +5079,6 @@ static word16 TLSX_QSH_Write(QSHScheme* list, byte* output)
/* write public key list in extension */
static word16 TLSX_QSHPK_WriteR(QSHScheme* format, byte* output);
static word16 TLSX_QSHPK_WriteR(QSHScheme* format, byte* output)
{
word32 offset = 0;
@@ -5609,7 +5608,7 @@ static int TLSX_SupportedVersions_GetSize(void* data, byte msgType, word16* pSz)
* returns the length of data that was written.
*/
static int TLSX_SupportedVersions_Write(void* data, byte* output,
byte msgType, word16* pSz)
byte msgType, word16* pSz)
{
WOLFSSL* ssl = (WOLFSSL*)data;
byte major;
@@ -5900,7 +5899,8 @@ static int TLSX_Cookie_GetSize(Cookie* cookie, byte msgType, word16* pSz)
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
static int TLSX_Cookie_Write(Cookie* cookie, byte* output, byte msgType, word16* pSz)
static int TLSX_Cookie_Write(Cookie* cookie, byte* output, byte msgType,
word16* pSz)
{
if (msgType == client_hello || msgType == hello_retry_request) {
c16toa(cookie->len, output);
@@ -6642,7 +6642,7 @@ static void TLSX_KeyShare_FreeAll(KeyShareEntry* list, void* heap)
*/
static word16 TLSX_KeyShare_GetSize(KeyShareEntry* list, byte msgType)
{
int len = 0;
word16 len = 0;
byte isRequest = (msgType == client_hello);
KeyShareEntry* current;
@@ -6659,10 +6659,10 @@ static word16 TLSX_KeyShare_GetSize(KeyShareEntry* list, byte msgType)
if (!isRequest && current->key == NULL)
continue;
len += (int)(KE_GROUP_LEN + OPAQUE16_LEN + current->pubKeyLen);
len += KE_GROUP_LEN + OPAQUE16_LEN + current->pubKeyLen;
}
return (word16)len;
return len;
}
/* Writes the key share extension into the output buffer.
@@ -7741,7 +7741,8 @@ static void TLSX_PreSharedKey_FreeAll(PreSharedKey* list, void* heap)
* returns the number of bytes of the encoded pre-shared key extension or
* SANITY_MSG_E to indicate invalid message type.
*/
static word16 TLSX_PreSharedKey_GetSize(PreSharedKey* list, byte msgType)
static int TLSX_PreSharedKey_GetSize(PreSharedKey* list, byte msgType,
word16* pSz)
{
if (msgType == client_hello) {
/* Length of identities + Length of binders. */
@@ -7752,14 +7753,16 @@ static word16 TLSX_PreSharedKey_GetSize(PreSharedKey* list, byte msgType)
OPAQUE8_LEN + list->binderLen;
list = list->next;
}
return len;
*pSz += len;
return 0;
}
if (msgType == server_hello) {
return OPAQUE16_LEN;
*pSz += OPAQUE16_LEN;
return 0;
}
return 0;
return SANITY_MSG_E;
}
/* The number of bytes to be written for the binders.
@@ -7769,12 +7772,13 @@ static word16 TLSX_PreSharedKey_GetSize(PreSharedKey* list, byte msgType)
* returns the number of bytes of the encoded pre-shared key extension or
* SANITY_MSG_E to indicate invalid message type.
*/
word16 TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list, byte msgType)
int TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list, byte msgType,
word16* pSz)
{
word16 len;
if (msgType != client_hello)
return (word16)SANITY_MSG_E;
return SANITY_MSG_E;
/* Length of all binders. */
len = OPAQUE16_LEN;
@@ -7783,7 +7787,8 @@ word16 TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list, byte msgType)
list = list->next;
}
return len;
*pSz = len;
return 0;
}
/* Writes the pre-shared key extension into the output buffer - binders only.
@@ -7794,8 +7799,8 @@ word16 TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list, byte msgType)
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
word16 TLSX_PreSharedKey_WriteBinders(PreSharedKey* list, byte* output,
byte msgType)
int TLSX_PreSharedKey_WriteBinders(PreSharedKey* list, byte* output,
byte msgType, word16* pSz)
{
PreSharedKey* current = list;
word16 idx = 0;
@@ -7803,7 +7808,7 @@ word16 TLSX_PreSharedKey_WriteBinders(PreSharedKey* list, byte* output,
word16 len;
if (msgType != client_hello)
return (word16)SANITY_MSG_E;
return SANITY_MSG_E;
/* Skip length of all binders. */
lenIdx = idx;
@@ -7821,7 +7826,8 @@ word16 TLSX_PreSharedKey_WriteBinders(PreSharedKey* list, byte* output,
len = idx - lenIdx - OPAQUE16_LEN;
c16toa(len, output + lenIdx);
return idx;
*pSz = idx;
return 0;
}
@@ -7833,14 +7839,15 @@ word16 TLSX_PreSharedKey_WriteBinders(PreSharedKey* list, byte* output,
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
static word16 TLSX_PreSharedKey_Write(PreSharedKey* list, byte* output,
byte msgType)
static int TLSX_PreSharedKey_Write(PreSharedKey* list, byte* output,
byte msgType, word16* pSz)
{
if (msgType == client_hello) {
PreSharedKey* current = list;
word16 idx = 0;
word16 lenIdx;
word16 len;
int ret;
/* Write identites only. Binders after HMACing over this. */
lenIdx = idx;
@@ -7867,26 +7874,28 @@ static word16 TLSX_PreSharedKey_Write(PreSharedKey* list, byte* output,
* The binders are based on the hash of all the ClientHello data up to
* and include the identities written above.
*/
idx += TLSX_PreSharedKey_GetSizeBinders(list, msgType);
return idx;
ret = TLSX_PreSharedKey_GetSizeBinders(list, msgType, &len);
if (ret < 0)
return ret;
*pSz += idx + len;
}
if (msgType == server_hello) {
else if (msgType == server_hello) {
word16 i;
/* Find the index of the chosen identity. */
for (i=0; list != NULL && !list->chosen; i++)
list = list->next;
if (list == NULL)
return (word16)BUILD_MSG_ERROR;
return BUILD_MSG_ERROR;
/* The index of the identity chosen by the server from the list supplied
* by the client.
*/
c16toa(i, output);
return OPAQUE16_LEN;
*pSz += OPAQUE16_LEN;
}
else
return SANITY_MSG_E;
return 0;
}
@@ -8167,8 +8176,8 @@ int TLSX_PreSharedKey_Use(WOLFSSL* ssl, byte* identity, word16 len, word32 age,
#else
#define PSK_FREE_ALL(a, b)
#define PSK_GET_SIZE(a, b) 0
#define PSK_WRITE(a, b, c) 0
#define PSK_GET_SIZE(a, b, c) 0
#define PSK_WRITE(a, b, c, d) 0
#define PSK_PARSE(a, b, c, d) 0
#endif
@@ -8185,7 +8194,7 @@ int TLSX_PreSharedKey_Use(WOLFSSL* ssl, byte* identity, word16 len, word32 age,
* msgType The type of the message this extension is being written into.
* returns the number of bytes of the encoded PSK KE mode extension.
*/
static word16 TLSX_PskKeModes_GetSize(byte modes, byte msgType)
static int TLSX_PskKeModes_GetSize(byte modes, byte msgType, word16* pSz)
{
if (msgType == client_hello) {
/* Format: Len | Modes* */
@@ -8195,10 +8204,11 @@ static word16 TLSX_PskKeModes_GetSize(byte modes, byte msgType)
len += OPAQUE8_LEN;
if (modes & (1 << PSK_DHE_KE))
len += OPAQUE8_LEN;
return len;
*pSz += len;
return 0;
}
return (word16)SANITY_MSG_E;
return SANITY_MSG_E;
}
/* Writes the PSK KE modes extension into the output buffer.
@@ -8210,7 +8220,8 @@ static word16 TLSX_PskKeModes_GetSize(byte modes, byte msgType)
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
static word16 TLSX_PskKeModes_Write(byte modes, byte* output, byte msgType)
static int TLSX_PskKeModes_Write(byte modes, byte* output, byte msgType,
word16* pSz)
{
if (msgType == client_hello) {
/* Format: Len | Modes* */
@@ -8224,10 +8235,11 @@ static word16 TLSX_PskKeModes_Write(byte modes, byte* output, byte msgType)
/* Write out length of mode list. */
output[0] = idx - OPAQUE8_LEN;
return idx;
*pSz += idx;
return 0;
}
return (word16)SANITY_MSG_E;
return SANITY_MSG_E;
}
/* Parse the PSK KE modes extension.
@@ -8315,8 +8327,8 @@ int TLSX_PskKeModes_Use(WOLFSSL* ssl, byte modes)
#else
#define PKM_GET_SIZE(a, b) 0
#define PKM_WRITE(a, b, c) 0
#define PKM_GET_SIZE(a, b, c) 0
#define PKM_WRITE(a, b, c, d) 0
#define PKM_PARSE(a, b, c, d) 0
#endif
@@ -8333,10 +8345,12 @@ int TLSX_PskKeModes_Use(WOLFSSL* ssl, byte modes)
* returns the number of bytes of the encoded Post-Handshake Authentication
* extension.
*/
static word16 TLSX_PostHandAuth_GetSize(byte msgType)
static int TLSX_PostHandAuth_GetSize(byte msgType, word16* pSz)
{
if (msgType == client_hello)
if (msgType == client_hello) {
*pSz += 0;
return 0;
}
return SANITY_MSG_E;
}
@@ -8349,12 +8363,14 @@ static word16 TLSX_PostHandAuth_GetSize(byte msgType)
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
static word16 TLSX_PostHandAuth_Write(byte* output, byte msgType)
static int TLSX_PostHandAuth_Write(byte* output, byte msgType, word16* pSz)
{
(void)output;
if (msgType == client_hello)
if (msgType == client_hello) {
*pSz += 0;
return 0;
}
return SANITY_MSG_E;
}
@@ -8414,8 +8430,8 @@ static int TLSX_PostHandAuth_Use(WOLFSSL* ssl)
#else
#define PHA_GET_SIZE(a) 0
#define PHA_WRITE(a, b) 0
#define PHA_GET_SIZE(a, b) 0
#define PHA_WRITE(a, b, c) 0
#define PHA_PARSE(a, b, c, d) 0
#endif
@@ -8431,14 +8447,18 @@ static int TLSX_PostHandAuth_Use(WOLFSSL* ssl)
* msgType The type of the message this extension is being written into.
* returns the number of bytes of the encoded Early Data Indication extension.
*/
static word16 TLSX_EarlyData_GetSize(byte msgType)
static int TLSX_EarlyData_GetSize(byte msgType, word16* pSz)
{
if (msgType == client_hello || msgType == encrypted_extensions)
return 0;
if (msgType == session_ticket)
return OPAQUE32_LEN;
int ret = 0;
return SANITY_MSG_E;
if (msgType == client_hello || msgType == encrypted_extensions)
*pSz += 0;
else if (msgType == session_ticket)
*pSz += OPAQUE32_LEN;
else
ret = SANITY_MSG_E;
return ret;
}
/* Writes the Early Data Indicator extension into the output buffer.
@@ -8450,14 +8470,15 @@ static word16 TLSX_EarlyData_GetSize(byte msgType)
* msgType The type of the message this extension is being written into.
* returns the number of bytes written into the buffer.
*/
static word16 TLSX_EarlyData_Write(word32 max, byte* output, byte msgType)
static int TLSX_EarlyData_Write(word32 max, byte* output, byte msgType,
word16* pSz)
{
if (msgType == client_hello || msgType == encrypted_extensions) {
if (msgType == client_hello || msgType == encrypted_extensions)
return 0;
}
if (msgType == session_ticket) {
else if (msgType == session_ticket) {
c32toa(max, output);
return OPAQUE32_LEN;
*pSz += OPAQUE32_LEN;
return 0;
}
return SANITY_MSG_E;
@@ -8543,8 +8564,8 @@ int TLSX_EarlyData_Use(WOLFSSL* ssl, word32 max)
#else
#define EDI_GET_SIZE(a) 0
#define EDI_WRITE(a, b, c) 0
#define EDI_GET_SIZE(a, b) 0
#define EDI_WRITE(a, b, c, d) 0
#define EDI_PARSE(a, b, c, d) 0
#endif
@@ -8694,7 +8715,8 @@ int TLSX_SupportExtensions(WOLFSSL* ssl) {
}
/** Tells the buffered size of the extensions in a list. */
static int TLSX_GetSize(TLSX* list, byte* semaphore, byte msgType, word16* pLength)
static int TLSX_GetSize(TLSX* list, byte* semaphore, byte msgType,
word16* pLength)
{
int ret = 0;
TLSX* extension;
@@ -8791,23 +8813,24 @@ static int TLSX_GetSize(TLSX* list, byte* semaphore, byte msgType, word16* pLeng
#if defined(HAVE_SESSION_TICKET) || !defined(NO_PSK)
case TLSX_PRE_SHARED_KEY:
length += PSK_GET_SIZE((PreSharedKey*)extension->data, msgType);
ret = PSK_GET_SIZE((PreSharedKey*)extension->data, msgType,
&length);
break;
case TLSX_PSK_KEY_EXCHANGE_MODES:
length += PKM_GET_SIZE(extension->val, msgType);
ret = PKM_GET_SIZE(extension->val, msgType, &length);
break;
#endif
#ifdef WOLFSSL_EARLY_DATA
case TLSX_EARLY_DATA:
length += EDI_GET_SIZE(msgType);
ret = EDI_GET_SIZE(msgType, &length);
break;
#endif
#ifdef WOLFSSL_POST_HANDSHAKE_AUTH
case TLSX_POST_HANDSHAKE_AUTH:
length += PHA_GET_SIZE(msgType);
ret = PHA_GET_SIZE(msgType, &length);
break;
#endif
@@ -8957,27 +8980,29 @@ static int TLSX_Write(TLSX* list, byte* output, byte* semaphore,
#if defined(HAVE_SESSION_TICKET) || !defined(NO_PSK)
case TLSX_PRE_SHARED_KEY:
WOLFSSL_MSG("Pre-Shared Key extension to write");
offset += PSK_WRITE((PreSharedKey*)extension->data,
output + offset, msgType);
ret = PSK_WRITE((PreSharedKey*)extension->data, output + offset,
msgType, &offset);
break;
case TLSX_PSK_KEY_EXCHANGE_MODES:
WOLFSSL_MSG("PSK Key Exchange Modes extension to write");
offset += PKM_WRITE(extension->val, output + offset, msgType);
ret = PKM_WRITE(extension->val, output + offset, msgType,
&offset);
break;
#endif
#ifdef WOLFSSL_EARLY_DATA
case TLSX_EARLY_DATA:
WOLFSSL_MSG("Early Data extension to write");
offset += EDI_WRITE(extension->val, output + offset, msgType);
ret = EDI_WRITE(extension->val, output + offset, msgType,
&offset);
break;
#endif
#ifdef WOLFSSL_POST_HANDSHAKE_AUTH
case TLSX_POST_HANDSHAKE_AUTH:
WOLFSSL_MSG("Post-Handshake Authentication extension to write");
offset += PHA_WRITE(output + offset, msgType);
ret = PHA_WRITE(output + offset, msgType, &offset);
break;
#endif
@@ -8991,7 +9016,7 @@ static int TLSX_Write(TLSX* list, byte* output, byte* semaphore,
case TLSX_KEY_SHARE:
WOLFSSL_MSG("Key Share extension to write");
offset += KS_WRITE((KeyShareEntry*)extension->data,
output + offset, msgType);
output + offset, msgType);
break;
#endif
}
@@ -9767,10 +9792,16 @@ int TLSX_GetRequestSize(WOLFSSL* ssl, byte msgType, word16* pLength)
}
#endif
#endif
if (ssl->extensions)
if (ssl->extensions) {
ret = TLSX_GetSize(ssl->extensions, semaphore, msgType, &length);
if (ssl->ctx && ssl->ctx->extensions)
if (ret != 0)
return ret;
}
if (ssl->ctx && ssl->ctx->extensions) {
ret = TLSX_GetSize(ssl->ctx->extensions, semaphore, msgType, &length);
if (ret != 0)
return ret;
}
#ifdef HAVE_EXTENDED_MASTER
if (msgType == client_hello && ssl->options.haveEMS &&
@@ -9870,10 +9901,14 @@ int TLSX_WriteRequest(WOLFSSL* ssl, byte* output, byte msgType, word16* pOffset)
if (ssl->extensions) {
ret = TLSX_Write(ssl->extensions, output + offset, semaphore,
msgType, &offset);
if (ret != 0)
return ret;
}
if (ssl->ctx && ssl->ctx->extensions) {
ret = TLSX_Write(ssl->ctx->extensions, output + offset, semaphore,
msgType, &offset);
if (ret != 0)
return ret;
}
#ifdef HAVE_EXTENDED_MASTER
@@ -9894,6 +9929,8 @@ int TLSX_WriteRequest(WOLFSSL* ssl, byte* output, byte msgType, word16* pOffset)
TURN_OFF(semaphore, TLSX_ToSemaphore(TLSX_PRE_SHARED_KEY));
ret = TLSX_Write(ssl->extensions, output + offset, semaphore,
client_hello, &offset);
if (ret != 0)
return ret;
}
#endif
#endif
@@ -10009,8 +10046,11 @@ int TLSX_GetResponseSize(WOLFSSL* ssl, byte msgType, word16* pLength)
}
#endif
if (TLSX_SupportExtensions(ssl))
if (TLSX_SupportExtensions(ssl)) {
ret = TLSX_GetSize(ssl->extensions, semaphore, msgType, &length);
if (ret != 0)
return ret;
}
/* All the response data is set at the ssl object only, so no ctx here. */
@@ -10111,6 +10151,8 @@ int TLSX_WriteResponse(WOLFSSL *ssl, byte* output, byte msgType, word16* pOffset
ret = TLSX_Write(ssl->extensions, output + offset, semaphore,
msgType, &offset);
if (ret != 0)
return ret;
#ifdef WOLFSSL_TLS13
if (msgType == hello_retry_request) {
@@ -10118,6 +10160,8 @@ int TLSX_WriteResponse(WOLFSSL *ssl, byte* output, byte msgType, word16* pOffset
TURN_OFF(semaphore, TLSX_ToSemaphore(TLSX_COOKIE));
ret = TLSX_Write(ssl->extensions, output + offset, semaphore,
msgType, &offset);
if (ret != 0)
return ret;
}
#endif

19
src/tls13.c
View File

@@ -2478,8 +2478,11 @@ static int WritePSKBinders(WOLFSSL* ssl, byte* output, word32 idx)
return SANITY_MSG_E;
/* Get the size of the binders to determine where to write binders. */
idx -= TLSX_PreSharedKey_GetSizeBinders((PreSharedKey*)ext->data,
client_hello);
ret = TLSX_PreSharedKey_GetSizeBinders((PreSharedKey*)ext->data,
client_hello, &len);
if (ret < 0)
return ret;
idx -= len;
/* Hash truncated ClientHello - up to binders. */
ret = HashOutput(ssl, output, idx, 0);
@@ -2520,8 +2523,10 @@ static int WritePSKBinders(WOLFSSL* ssl, byte* output, word32 idx)
}
/* Data entered into extension, now write to message. */
len = TLSX_PreSharedKey_WriteBinders((PreSharedKey*)ext->data, output + idx,
client_hello);
ret = TLSX_PreSharedKey_WriteBinders((PreSharedKey*)ext->data, output + idx,
client_hello, &len);
if (ret < 0)
return ret;
/* Hash binders to complete the hash of the ClientHello. */
ret = HashOutputRaw(ssl, output + idx, len);
@@ -3380,8 +3385,10 @@ static int DoPreSharedKeys(WOLFSSL* ssl, const byte* input, word32 helloSz,
/* Find the pre-shared key extension and calculate hash of truncated
* ClientHello for binders.
*/
bindersLen = TLSX_PreSharedKey_GetSizeBinders((PreSharedKey*)ext->data,
client_hello);
ret = TLSX_PreSharedKey_GetSizeBinders((PreSharedKey*)ext->data,
client_hello, &bindersLen);
if (ret < 0)
return ret;
/* Hash data up to binders for deriving binders in PSK extension. */
ret = HashInput(ssl, input, helloSz - bindersLen);

9
wolfssl/internal.h
View File

@@ -2445,10 +2445,11 @@ typedef struct PreSharedKey {
struct PreSharedKey* next; /* List pointer */
} PreSharedKey;
WOLFSSL_LOCAL word16 TLSX_PreSharedKey_WriteBinders(PreSharedKey* list,
byte* output, byte msgType);
WOLFSSL_LOCAL word16 TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list,
byte msgType);
WOLFSSL_LOCAL int TLSX_PreSharedKey_WriteBinders(PreSharedKey* list,
byte* output, byte msgType,
word16* pSz);
WOLFSSL_LOCAL int TLSX_PreSharedKey_GetSizeBinders(PreSharedKey* list,
byte msgType, word16* pSz);
WOLFSSL_LOCAL int TLSX_PreSharedKey_Use(WOLFSSL* ssl, byte* identity,
word16 len, word32 age, byte hmac,
byte cipherSuite0, byte cipherSuite,