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Merge pull request #4446 from ejohnstown/dtls-sizing

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DTLS Sizing
This commit is contained in:
David Garske
2021-10-28 14:15:36 -07:00
committed by GitHub
parent 2c42770eea adee6a86d1
commit 0a26335243
8 changed files with 3199 additions and 1745 deletions
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2
examples/client/client.c
View File

@ -3184,7 +3184,7 @@ THREAD_RETURN WOLFSSL_THREAD client_test(void* args)
useLibOqs, oqsAlg, exitWithRet, version,
onlyKeyShare);
wolfSSL_CTX_free(ctx); ctx = NULL;
if (!exitWithRet)
if (((func_args*)args)->return_code != EXIT_SUCCESS && !exitWithRet)
XEXIT_T(EXIT_SUCCESS);
else
goto exit;

6
examples/server/server.c
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@ -395,7 +395,7 @@ int ServerEchoData(SSL* ssl, int clientfd, int echoData, int block,
/* Read data */
while (rx_pos < len) {
ret = SSL_read(ssl, &buffer[rx_pos], len - rx_pos);
if (ret < 0) {
if (ret <= 0) {
err = SSL_get_error(ssl, 0);
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {
@ -3183,6 +3183,8 @@ THREAD_RETURN WOLFSSL_THREAD server_test(void* args)
}
else if (err == 0 || err == WOLFSSL_ERROR_ZERO_RETURN) {
err = ServerEchoData(ssl, clientfd, echoData, block, throughput);
if (err == WOLFSSL_ERROR_ZERO_RETURN && runWithErrors == 1) /* Got close notify */
err = 0;
if (err != 0) {
SSL_free(ssl); ssl = NULL;
SSL_CTX_free(ctx); ctx = NULL;
@ -3199,14 +3201,12 @@ THREAD_RETURN WOLFSSL_THREAD server_test(void* args)
Task_yield();
#endif
if (dtlsUDP == 0) {
ret = SSL_shutdown(ssl);
if (wc_shutdown && ret == WOLFSSL_SHUTDOWN_NOT_DONE) {
ret = SSL_shutdown(ssl); /* bidirectional shutdown */
if (ret == WOLFSSL_SUCCESS)
printf("Bidirectional shutdown complete\n");
}
}
/* display collected statistics */
#ifdef WOLFSSL_STATIC_MEMORY

115
src/internal.c
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@ -8683,7 +8683,7 @@ static int SendHandshakeMsg(WOLFSSL* ssl, byte* input, word32 inputSz,
inputSz += HANDSHAKE_HEADER_SZ;
headerSz = RECORD_HEADER_SZ;
}
maxFrag = wolfSSL_GetMaxRecordSize(ssl, (int)inputSz);
maxFrag = wolfSSL_GetMaxFragSize(ssl, (int)inputSz);
/* Make sure input is not the ssl output buffer as this
* function doesn't handle that */
@ -18240,7 +18240,7 @@ exit_buildmsg:
ssl->options.buildMsgState = BUILD_MSG_BEGIN;
#ifdef WOLFSSL_DTLS
if (ret == 0 && ssl->options.dtls)
if (ret == 0 && ssl->options.dtls && !sizeOnly)
DtlsSEQIncrement(ssl, epochOrder);
#endif
@ -18532,10 +18532,25 @@ int CreateOcspResponse(WOLFSSL* ssl, OcspRequest** ocspRequest,
static int cipherExtraData(WOLFSSL* ssl)
{
int cipherExtra;
/* Cipher data that may be added by BuildMessage */
return ssl->specs.hash_size + ssl->specs.block_size +
ssl->specs.aead_mac_size + ssl->specs.iv_size +
ssl->specs.pad_size;
/* There is always an IV (expect for chacha). For AEAD ciphers,
* there is the authentication tag (aead_mac_size). For block
* ciphers we have the hash_size MAC on the message, and one
* block size for possible padding. */
if (ssl->specs.cipher_type == aead) {
cipherExtra = ssl->specs.aead_mac_size;
/* CHACHA does not have an explicit IV. */
if (ssl->specs.bulk_cipher_algorithm != wolfssl_chacha) {
cipherExtra += AESGCM_EXP_IV_SZ;
}
}
else {
cipherExtra = ssl->specs.iv_size + ssl->specs.block_size +
ssl->specs.hash_size;
}
/* Sanity check so we don't ever return negative. */
return cipherExtra > 0 ? cipherExtra : 0;
}
#ifndef WOLFSSL_NO_TLS12
@ -18600,7 +18615,7 @@ int SendCertificate(WOLFSSL* ssl)
maxFragment = MAX_RECORD_SIZE;
maxFragment = wolfSSL_GetMaxRecordSize(ssl, maxFragment);
maxFragment = wolfSSL_GetMaxFragSize(ssl, maxFragment);
while (length > 0 && ret == 0) {
byte* output = NULL;
@ -18632,10 +18647,8 @@ int SendCertificate(WOLFSSL* ssl)
else {
#ifdef WOLFSSL_DTLS
fragSz = min(length, maxFragment);
sendSz += fragSz + DTLS_RECORD_EXTRA + DTLS_HANDSHAKE_EXTRA
+ HANDSHAKE_HEADER_SZ;
i += DTLS_RECORD_EXTRA + DTLS_HANDSHAKE_EXTRA
+ HANDSHAKE_HEADER_SZ;
sendSz += fragSz + DTLS_RECORD_EXTRA + DTLS_HANDSHAKE_HEADER_SZ;
i += DTLS_RECORD_EXTRA + DTLS_HANDSHAKE_HEADER_SZ;
#endif
}
@ -19364,6 +19377,28 @@ int IsSCR(WOLFSSL* ssl)
}
#ifdef WOLFSSL_DTLS
static int ModifyForMTU(WOLFSSL* ssl, int buffSz, int outputSz, int mtuSz)
{
int recordExtra = outputSz - buffSz;
(void)ssl;
if (recordExtra > 0 && outputSz > mtuSz) {
buffSz = mtuSz - recordExtra;
#ifndef WOLFSSL_AEAD_ONLY
/* Subtract a block size to be certain that returned fragment
* size won't get more padding. */
if (ssl->specs.cipher_type == block)
buffSz -= ssl->specs.block_size;
#endif
}
return buffSz;
}
#endif
int SendData(WOLFSSL* ssl, const void* data, int sz)
{
int sent = 0, /* plainText size */
@ -19459,9 +19494,18 @@ int SendData(WOLFSSL* ssl, const void* data, int sz)
byte comp[MAX_RECORD_SIZE + MAX_COMP_EXTRA];
#endif
if (sent == sz) break;
#ifdef WOLFSSL_DTLS
if (ssl->options.dtls) {
buffSz = wolfSSL_GetMaxFragSize(ssl, sz - sent);
}
else
#endif
{
buffSz = wolfSSL_GetMaxFragSize(ssl, sz - sent);
buffSz = wolfSSL_GetMaxRecordSize(ssl, sz - sent);
}
if (sent == sz) break;
#if defined(WOLFSSL_DTLS) && !defined(WOLFSSL_NO_DTLS_SIZE_CHECK)
if (ssl->options.dtls && (buffSz < sz - sent)) {
@ -19470,9 +19514,8 @@ int SendData(WOLFSSL* ssl, const void* data, int sz)
return ssl->error;
}
#endif
outputSz = buffSz + COMP_EXTRA + DTLS_RECORD_HEADER_SZ +
DTLS_HANDSHAKE_HEADER_SZ;
if (IsEncryptionOn(ssl, 1))
outputSz = buffSz + COMP_EXTRA + DTLS_RECORD_HEADER_SZ;
if (IsEncryptionOn(ssl, 1) || ssl->options.tls1_3)
outputSz += cipherExtraData(ssl);
/* check for available size */
@ -32342,8 +32385,15 @@ int wolfSSL_AsyncPush(WOLFSSL* ssl, WC_ASYNC_DEV* asyncDev)
#endif /* WOLFSSL_ASYNC_CRYPT */
/* return the max record size */
int wolfSSL_GetMaxRecordSize(WOLFSSL* ssl, int maxFragment)
/**
* Return the max fragment size. This is essentially the maximum
* fragment_length available.
* @param ssl WOLFSSL object containing ciphersuite information.
* @param maxFragment The amount of space we want to check is available. This
* is only the fragment length WITHOUT the (D)TLS headers.
* @return Max fragment size
*/
int wolfSSL_GetMaxFragSize(WOLFSSL* ssl, int maxFragment)
{
(void) ssl; /* Avoid compiler warnings */
@ -32358,24 +32408,27 @@ int wolfSSL_GetMaxRecordSize(WOLFSSL* ssl, int maxFragment)
#endif /* HAVE_MAX_FRAGMENT */
#ifdef WOLFSSL_DTLS
if (IsDtlsNotSctpMode(ssl)) {
int cipherExtra = IsEncryptionOn(ssl, 1) ? cipherExtraData(ssl) : 0;
if (maxFragment > MAX_UDP_SIZE) {
maxFragment = MAX_UDP_SIZE;
int outputSz, mtuSz;
/* Given a input buffer size of maxFragment, how big will the
* encrypted output be? */
if (IsEncryptionOn(ssl, 1)) {
outputSz = BuildMessage(ssl, NULL, 0, NULL,
maxFragment + DTLS_HANDSHAKE_HEADER_SZ,
application_data, 0, 1, 0, CUR_ORDER);
}
if (maxFragment > MAX_MTU - COMP_EXTRA - DTLS_RECORD_HEADER_SZ -
DTLS_HANDSHAKE_HEADER_SZ - cipherExtra) {
maxFragment = MAX_MTU - COMP_EXTRA - DTLS_RECORD_HEADER_SZ -
DTLS_HANDSHAKE_HEADER_SZ - cipherExtra;
else {
outputSz = maxFragment + DTLS_RECORD_HEADER_SZ +
DTLS_HANDSHAKE_HEADER_SZ;
}
/* Readjust maxFragment for MTU size. */
#if defined(WOLFSSL_DTLS_MTU)
{
int overheadSz = DTLS_RECORD_HEADER_SZ + DTLS_HANDSHAKE_HEADER_SZ +
COMP_EXTRA + cipherExtra;
if (maxFragment > ssl->dtlsMtuSz - overheadSz) {
maxFragment = ssl->dtlsMtuSz - overheadSz;
}
}
mtuSz = ssl->dtlsMtuSz;
#else
mtuSz = MAX_MTU;
#endif
maxFragment = ModifyForMTU(ssl, maxFragment, outputSz, mtuSz);
}
#endif

2
src/ssl.c
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@ -1807,7 +1807,7 @@ int wolfSSL_GetMaxOutputSize(WOLFSSL* ssl)
return BAD_FUNC_ARG;
}
return wolfSSL_GetMaxRecordSize(ssl, OUTPUT_RECORD_SIZE);
return wolfSSL_GetMaxFragSize(ssl, OUTPUT_RECORD_SIZE);
}

2
src/tls13.c
View File

@ -5748,7 +5748,7 @@ static int SendTls13Certificate(WOLFSSL* ssl)
if (ssl->fragOffset != 0)
length -= (ssl->fragOffset + headerSz);
maxFragment = wolfSSL_GetMaxRecordSize(ssl, MAX_RECORD_SIZE);
maxFragment = wolfSSL_GetMaxFragSize(ssl, MAX_RECORD_SIZE);
while (length > 0 && ret == 0) {
byte* output = NULL;

4788
tests/test-dtls-mtu.conf
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File diff suppressed because it is too large Load Diff

5
tests/unit.c
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@ -122,12 +122,17 @@ int unit_test(int argc, char** argv)
}
#endif
#ifdef WOLFSSL_ALLOW_SKIP_UNIT_TESTS
if (argc == 1)
#endif
{
ApiTest();
if ( (ret = HashTest()) != 0){
printf("hash test failed with %d\n", ret);
goto exit;
}
}
#ifndef NO_WOLFSSL_CIPHER_SUITE_TEST
#if !defined(NO_WOLFSSL_CLIENT) && !defined(NO_WOLFSSL_SERVER)

2
wolfssl/internal.h
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@ -4649,7 +4649,7 @@ WOLFSSL_LOCAL void ShrinkOutputBuffer(WOLFSSL* ssl);
WOLFSSL_LOCAL int VerifyClientSuite(WOLFSSL* ssl);
WOLFSSL_LOCAL int SetTicket(WOLFSSL*, const byte*, word32);
WOLFSSL_LOCAL int wolfSSL_GetMaxRecordSize(WOLFSSL* ssl, int maxFragment);
WOLFSSL_LOCAL int wolfSSL_GetMaxFragSize(WOLFSSL* ssl, int maxFragment);
#if defined(WOLFSSL_IOTSAFE) && defined(HAVE_PK_CALLBACKS)
WOLFSSL_LOCAL IOTSAFE *wolfSSL_get_iotsafe_ctx(WOLFSSL *ssl);