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Use the TLSv1.3 record header as AAD 

As of TLSv1.3 draft-25 the record header data must be used as AAD

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/5604)
This commit is contained in:
Matt Caswell 2018-02-26 12:26:14 +00:00
parent 95ea8da176
commit 3295d24238
8 changed files with 67 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
engines/e_ossltest.c
View File

@ -637,7 +637,7 @@ int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_gcm())(ctx, out, in, inl);
/* Throw it all away and just use the plaintext as the output */
if (tmpbuf != NULL)
if (tmpbuf != NULL && out != NULL)
memcpy(out, tmpbuf, inl);
OPENSSL_free(tmpbuf);

4
ssl/record/rec_layer_s3.c
View File

@ -825,7 +825,6 @@ int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
thispkt = &pkt[j];
thiswr = &wr[j];
SSL3_RECORD_set_type(thiswr, type);
/*
* In TLSv1.3, once encrypting, we always use application data for the
* record type
@ -834,6 +833,8 @@ int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
rectype = SSL3_RT_APPLICATION_DATA;
else
rectype = type;
SSL3_RECORD_set_type(thiswr, rectype);
/*
* Some servers hang if initial client hello is larger than 256 bytes
* and record version number > TLS 1.0
@ -843,6 +844,7 @@ int do_ssl3_write(SSL *s, int type, const unsigned char *buf,
&& TLS1_get_version(s) > TLS1_VERSION
&& s->hello_retry_request == SSL_HRR_NONE)
version = TLS1_VERSION;
SSL3_RECORD_set_rec_version(thiswr, version);
maxcomplen = pipelens[j];
if (s->compress != NULL)

1
ssl/record/record_locl.h
View File

@ -80,6 +80,7 @@ int ssl3_release_write_buffer(SSL *s);
#define SSL3_RECORD_get_type(r) ((r)->type)
#define SSL3_RECORD_set_type(r, t) ((r)->type = (t))
#define SSL3_RECORD_set_rec_version(r, v) ((r)->rec_version = (v))
#define SSL3_RECORD_get_length(r) ((r)->length)
#define SSL3_RECORD_set_length(r, l) ((r)->length = (l))
#define SSL3_RECORD_add_length(r, l) ((r)->length += (l))

14
ssl/record/ssl3_record.c
View File

@ -270,7 +270,8 @@ int ssl3_get_record(SSL *s)
thisrr->rec_version = version;
/*
* Lets check version. In TLSv1.3 we ignore this field. For the
* Lets check version. In TLSv1.3 we only check this field
* when encryption is occurring (see later check). For the
* ServerHello after an HRR we haven't actually selected TLSv1.3
* yet, but we still treat it as TLSv1.3, so we must check for
* that explicitly
@ -333,15 +334,20 @@ int ssl3_get_record(SSL *s)
}
}
if (SSL_IS_TLS13(s)
&& s->enc_read_ctx != NULL
&& thisrr->type != SSL3_RT_APPLICATION_DATA
if (SSL_IS_TLS13(s) && s->enc_read_ctx != NULL) {
if (thisrr->type != SSL3_RT_APPLICATION_DATA
&& (thisrr->type != SSL3_RT_CHANGE_CIPHER_SPEC
|| !SSL_IS_FIRST_HANDSHAKE(s))) {
SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE);
return -1;
}
if (thisrr->rec_version != TLS1_2_VERSION) {
SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_F_SSL3_GET_RECORD,
SSL_R_WRONG_VERSION_NUMBER);
return -1;
}
}
if (thisrr->length >
SSL3_BUFFER_get_len(rbuf) - SSL3_RT_HEADER_LENGTH) {

31
ssl/record/ssl3_record_tls13.c
View File

@ -25,13 +25,14 @@
int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int sending)
{
EVP_CIPHER_CTX *ctx;
unsigned char iv[EVP_MAX_IV_LENGTH];
size_t ivlen, taglen, offset, loop;
unsigned char iv[EVP_MAX_IV_LENGTH], recheader[SSL3_RT_HEADER_LENGTH];
size_t ivlen, taglen, offset, loop, hdrlen;
unsigned char *staticiv;
unsigned char *seq;
int lenu, lenf;
SSL3_RECORD *rec = &recs[0];
uint32_t alg_enc;
WPACKET wpkt;
if (n_recs != 1) {
/* Should not happen */
@ -143,7 +144,31 @@ int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int sending)
if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, sending) <= 0
|| (!sending && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
taglen,
rec->data + rec->length) <= 0)
rec->data + rec->length) <= 0)) {
return -1;
}
/* Set up the AAD */
if (!WPACKET_init_static_len(&wpkt, recheader, sizeof(recheader), 0)
|| !WPACKET_put_bytes_u8(&wpkt, rec->type)
|| !WPACKET_put_bytes_u16(&wpkt, rec->rec_version)
|| !WPACKET_put_bytes_u16(&wpkt, rec->length + taglen)
|| !WPACKET_get_total_written(&wpkt, &hdrlen)
|| hdrlen != SSL3_RT_HEADER_LENGTH
|| !WPACKET_finish(&wpkt)) {
WPACKET_cleanup(&wpkt);
return -1;
}
/*
* For CCM we must explicitly set the total plaintext length before we add
* any AAD.
*/
if (((alg_enc & SSL_AESCCM) != 0
&& EVP_CipherUpdate(ctx, NULL, &lenu, NULL,
(unsigned int)rec->length) <= 0)
|| EVP_CipherUpdate(ctx, NULL, &lenu, recheader,
sizeof(recheader)) <= 0
|| EVP_CipherUpdate(ctx, rec->data, &lenu, rec->input,
(unsigned int)rec->length) <= 0
|| EVP_CipherFinal_ex(ctx, rec->data + lenu, &lenf) <= 0

6
test/recipes/70-test_sslrecords.t
View File

@ -149,11 +149,11 @@ ok(TLSProxy::Message->fail(), "Changed record version in TLS1.2");
SKIP: {
skip "TLSv1.3 disabled", 6 if disabled("tls1_3");
#Test 13: Sending a different record version in TLS1.3 should succeed
#Test 13: Sending a different record version in TLS1.3 should fail
$proxy->clear();
$proxy->filter(\&change_version);
$proxy->start();
ok(TLSProxy::Message->success(), "Changed record version in TLS1.3");
ok(TLSProxy::Message->fail(), "Changed record version in TLS1.3");
#Test 14: Sending an unrecognised record type in TLS1.3 should fail
$proxy->clear();
@ -464,7 +464,7 @@ sub change_version
my $proxy = shift;
# We'll change a version after the initial version neg has taken place
if ($proxy->flight != 2) {
if ($proxy->flight != 1) {
return;
}

4
test/recordlentest.c
View File

@ -157,10 +157,6 @@ static int test_record_overflow(int idx)
overf_expected = 0;
}
if (idx == TEST_ENCRYPTED_OVERFLOW_TLS1_3_OK
|| idx == TEST_ENCRYPTED_OVERFLOW_TLS1_3_NOT_OK)
recversion = TLS1_VERSION;
else
recversion = TLS1_2_VERSION;
if (!TEST_true(write_record(serverbio, len, SSL3_RT_APPLICATION_DATA,

24
test/tls13encryptiontest.c
View File

@ -92,7 +92,7 @@ static RECORD_DATA refdata[] = {
"83dd29f64508b2ec3e635a2134fc0e1a39d3ecb51dcddfcf8382c88ffe2a7378"
"42ad1de7fe505b6c4d1673870f6fc2a0f2f7972acaee368a1599d64ba18798f1"
"0333f9779bd5b05f9b084d03dab2f3d80c2eb74ec70c9866ea31c18b491cd597"
"aae3e941205fcc38a3a10ce8c0269f02ccc9c51278e25f1a0f0731a9"
"aae3e941205fcc38a3a10ce8f2e230d97e3406b77ee53d84d89ca548"
},
"d2dd45f87ad87801a85ac38187f9023b",
"f0a14f808692cef87a3daf70",
@ -106,7 +106,7 @@ static RECORD_DATA refdata[] = {
},
{
"fa15e92daa21cd05d8f9c3152a61748d9aaf049da559718e583f95aacecad657"
"b52a6562da09a5819e864d86ac2989360a1eb22795","",""
"b52a6562da66864fd14969acc30dc04a78c38283c5","",""
},
"40e1201d75d419627f04c88530a15c9d",
"a0f073f3b35e18f96969696b",
@ -128,7 +128,7 @@ static RECORD_DATA refdata[] = {
"836905229eac811c4ef8b2faa89867e9ffc586f7f03c216591aa5e620eac3c62"
"dfe60f846036bd7ecc4464b584af184e9644e94ee1d7834dba408a51cbe42480"
"04796ed9c558e0f5f96115a6f6ba487e17d16a2e20a3d3a650a9a070fb53d9da"
"82864b5621d77650bd0c7947e9889917b53d0515627c72b0ded521","",""
"82864b5621d77650bd0c7972f592aa8546de09b8e46921fab4d876","",""
},
"3381f6b3f94500f16226de440193e858",
"4f1d73cc1d465eb30021c41f",
@ -142,8 +142,8 @@ static RECORD_DATA refdata[] = {
},
{
"e306178ad97f74bb64f35eaf3c39846b83aef8472cbc9046749b81a949dfb12c"
"fbc65cbabd20ade92c1f944605892ceeb12fdee8a927bce77c83036ac5a794a8"
"f54a69","",""
"fbc65cbabd20ade92c1f944605892ceeb12fde5781d40e2ca080fc921b750b8c"
"21bd8d","",""
},
"eb23a804904b80ba4fe8399e09b1ce42",
"efa8c50c06b9c9b8c483e174",
@ -157,8 +157,8 @@ static RECORD_DATA refdata[] = {
},
{
"467d99a807dbf778e6ffd8be52456c70665f890811ef2f3c495d5bbe983feeda"
"b0c251dde596bc7e2b135909ec9f9166fb0152e8c16a84e4b1039256467f9538"
"be4463","",""
"b0c251dde596bc7e2b135909ec9f9166fb01526c70c7e42b6df52d63b0000222"
"cb2047","",""
},
"3381f6b3f94500f16226de440193e858",
"4f1d73cc1d465eb30021c41f",
@ -170,7 +170,7 @@ static RECORD_DATA refdata[] = {
"010015","",""
},
{
"6bdf60847ba6fb650da36e872adc684a4af2e8","",""
"6bdf609107610cff95d70387a67b89e2494f0d","",""
},
"eb23a804904b80ba4fe8399e09b1ce42",
"efa8c50c06b9c9b8c483e174",
@ -182,7 +182,7 @@ static RECORD_DATA refdata[] = {
"010015","",""
},
{
"621b7cc1962cd8a70109fee68a52efedf87d2e","",""
"621b7c60d32528b149b36a78c8891a8d2f65ad","",""
},
"3381f6b3f94500f16226de440193e858",
"4f1d73cc1d465eb30021c41f",
@ -306,7 +306,13 @@ static int test_tls13_encryption(void)
int ret = 0;
size_t ivlen, ctr;
/*
* Encrypted TLSv1.3 records always have an outer content type of
* application data, and a record version of TLSv1.2.
*/
rec.data = NULL;
rec.type = SSL3_RT_APPLICATION_DATA;
rec.rec_version = TLS1_2_VERSION;
ctx = SSL_CTX_new(TLS_method());
if (!TEST_ptr(ctx)) {