* https://www.openssl.org/source/license.html
*/
+#include <assert.h>
#include "../ssl_locl.h"
#include "internal/constant_time_locl.h"
#include <openssl/rand.h>
/* used only by ssl3_read_bytes */
int ssl3_get_record(SSL *s)
{
- int ssl_major, ssl_minor, al;
+ int al;
int enc_err, rret, ret = -1;
int i;
size_t more, n;
- SSL3_RECORD *rr;
+ SSL3_RECORD *rr, *thisrr;
SSL3_BUFFER *rbuf;
SSL_SESSION *sess;
unsigned char *p;
unsigned char md[EVP_MAX_MD_SIZE];
- short version;
+ unsigned int version;
size_t mac_size;
int imac_size;
size_t num_recs = 0, max_recs, j;
+ PACKET pkt, sslv2pkt;
rr = RECORD_LAYER_get_rrec(&s->rlayer);
rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
sess = s->session;
do {
+ thisrr = &rr[num_recs];
+
/* check if we have the header */
if ((RECORD_LAYER_get_rstate(&s->rlayer) != SSL_ST_READ_BODY) ||
(RECORD_LAYER_get_packet_length(&s->rlayer)
< SSL3_RT_HEADER_LENGTH)) {
+ size_t sslv2len;
+ unsigned int type;
+
rret = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH,
SSL3_BUFFER_get_len(rbuf), 0,
num_recs == 0 ? 1 : 0, &n);
RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_BODY);
p = RECORD_LAYER_get_packet(&s->rlayer);
-
+ if (!PACKET_buf_init(&pkt, RECORD_LAYER_get_packet(&s->rlayer),
+ RECORD_LAYER_get_packet_length(&s->rlayer))) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+ sslv2pkt = pkt;
+ if (!PACKET_get_net_2_len(&sslv2pkt, &sslv2len)
+ || !PACKET_get_1(&sslv2pkt, &type)) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
/*
* The first record received by the server may be a V2ClientHello.
*/
if (s->server && RECORD_LAYER_is_first_record(&s->rlayer)
- && (p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
+ && (sslv2len & 0x8000) != 0
+ && (type == SSL2_MT_CLIENT_HELLO)) {
/*
* SSLv2 style record
*
* because it is an SSLv2ClientHello. We keep it using
* |num_recs| for the sake of consistency
*/
- rr[num_recs].type = SSL3_RT_HANDSHAKE;
- rr[num_recs].rec_version = SSL2_VERSION;
+ thisrr->type = SSL3_RT_HANDSHAKE;
+ thisrr->rec_version = SSL2_VERSION;
- rr[num_recs].length = ((p[0] & 0x7f) << 8) | p[1];
+ thisrr->length = sslv2len & 0x7fff;
- if (rr[num_recs].length > SSL3_BUFFER_get_len(rbuf)
+ if (thisrr->length > SSL3_BUFFER_get_len(rbuf)
- SSL2_RT_HEADER_LENGTH) {
al = SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);
goto f_err;
}
- if (rr[num_recs].length < MIN_SSL2_RECORD_LEN) {
+ if (thisrr->length < MIN_SSL2_RECORD_LEN) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
}
} else {
/* SSLv3+ style record */
+ /*
+ * TODO(TLS1.3): This callback only provides the "outer" record
+ * type to the callback. Somehow we need to pass the "inner"
+ * record type
+ */
if (s->msg_callback)
s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s,
s->msg_callback_arg);
/* Pull apart the header into the SSL3_RECORD */
- rr[num_recs].type = *(p++);
- ssl_major = *(p++);
- ssl_minor = *(p++);
- version = (ssl_major << 8) | ssl_minor;
- rr[num_recs].rec_version = version;
- n2s(p, rr[num_recs].length);
-
- /* Lets check version */
- if (!s->first_packet && version != s->version) {
+ if (!PACKET_get_1(&pkt, &type)
+ || !PACKET_get_net_2(&pkt, &version)
+ || !PACKET_get_net_2_len(&pkt, &thisrr->length)) {
+ al = SSL_AD_INTERNAL_ERROR;
+ SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
+ goto f_err;
+ }
+ thisrr->type = type;
+ thisrr->rec_version = version;
+
+ /* Lets check version. In TLSv1.3 we ignore this field */
+ if (!s->first_packet && !SSL_IS_TLS13(s)
+ && version != (unsigned int)s->version) {
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);
if ((s->version & 0xFF00) == (version & 0xFF00)
&& !s->enc_write_ctx && !s->write_hash) {
- if (rr->type == SSL3_RT_ALERT) {
+ if (thisrr->type == SSL3_RT_ALERT) {
/*
* The record is using an incorrect version number,
* but what we've got appears to be an alert. We
}
}
- if (rr[num_recs].length >
+ if (SSL_IS_TLS13(s) && s->enc_read_ctx != NULL
+ && thisrr->type != SSL3_RT_APPLICATION_DATA) {
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE);
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ goto f_err;
+ }
+
+ if (thisrr->length >
SSL3_BUFFER_get_len(rbuf) - SSL3_RT_HEADER_LENGTH) {
al = SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);
* Calculate how much more data we need to read for the rest of the
* record
*/
- if (rr[num_recs].rec_version == SSL2_VERSION) {
- more = rr[num_recs].length + SSL2_RT_HEADER_LENGTH
+ if (thisrr->rec_version == SSL2_VERSION) {
+ more = thisrr->length + SSL2_RT_HEADER_LENGTH
- SSL3_RT_HEADER_LENGTH;
} else {
- more = rr[num_recs].length;
+ more = thisrr->length;
}
if (more > 0) {
/* now s->packet_length == SSL3_RT_HEADER_LENGTH */
RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_HEADER);
/*
- * At this point, s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length,
- * or s->packet_length == SSL2_RT_HEADER_LENGTH + rr->length
- * and we have that many bytes in s->packet
+ * At this point, s->packet_length == SSL3_RT_HEADER_LENGTH
+ * + thisrr->length, or s->packet_length == SSL2_RT_HEADER_LENGTH
+ * + thisrr->length and we have that many bytes in s->packet
*/
- if (rr[num_recs].rec_version == SSL2_VERSION) {
- rr[num_recs].input =
+ if (thisrr->rec_version == SSL2_VERSION) {
+ thisrr->input =
&(RECORD_LAYER_get_packet(&s->rlayer)[SSL2_RT_HEADER_LENGTH]);
} else {
- rr[num_recs].input =
+ thisrr->input =
&(RECORD_LAYER_get_packet(&s->rlayer)[SSL3_RT_HEADER_LENGTH]);
}
/*
- * ok, we can now read from 's->packet' data into 'rr' rr->input points
- * at rr->length bytes, which need to be copied into rr->data by either
- * the decryption or by the decompression When the data is 'copied' into
- * the rr->data buffer, rr->input will be pointed at the new buffer
+ * ok, we can now read from 's->packet' data into 'thisrr' thisrr->input
+ * points at thisrr->length bytes, which need to be copied into
+ * thisrr->data by either the decryption or by the decompression When
+ * the data is 'copied' into the thisrr->data buffer, thisrr->input will
+ * be pointed at the new buffer
*/
/*
- * We now have - encrypted [ MAC [ compressed [ plain ] ] ] rr->length
- * bytes of encrypted compressed stuff.
+ * We now have - encrypted [ MAC [ compressed [ plain ] ] ]
+ * thisrr->length bytes of encrypted compressed stuff.
*/
/* check is not needed I believe */
- if (rr[num_recs].length > SSL3_RT_MAX_ENCRYPTED_LENGTH) {
+ if (thisrr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH) {
al = SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
goto f_err;
}
- /* decrypt in place in 'rr->input' */
- rr[num_recs].data = rr[num_recs].input;
- rr[num_recs].orig_len = rr[num_recs].length;
+ /* decrypt in place in 'thisrr->input' */
+ thisrr->data = thisrr->input;
+ thisrr->orig_len = thisrr->length;
/* Mark this record as not read by upper layers yet */
- rr[num_recs].read = 0;
+ thisrr->read = 0;
num_recs++;
RECORD_LAYER_reset_packet_length(&s->rlayer);
RECORD_LAYER_clear_first_record(&s->rlayer);
} while (num_recs < max_recs
- && rr[num_recs - 1].type == SSL3_RT_APPLICATION_DATA
+ && thisrr->type == SSL3_RT_APPLICATION_DATA
&& SSL_USE_EXPLICIT_IV(s)
&& s->enc_read_ctx != NULL
&& (EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_read_ctx))
* If in encrypt-then-mac mode calculate mac from encrypted record. All
* the details below are public so no timing details can leak.
*/
- if (SSL_USE_ETM(s) && s->read_hash) {
+ if (SSL_READ_ETM(s) && s->read_hash) {
unsigned char *mac;
/* TODO(size_t): convert this to do size_t properly */
imac_size = EVP_MD_CTX_size(s->read_hash);
- if (imac_size < 0) {
+ assert(imac_size >= 0 && imac_size <= EVP_MAX_MD_SIZE);
+ if (imac_size < 0 || imac_size > EVP_MAX_MD_SIZE) {
al = SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_GET_RECORD, ERR_LIB_EVP);
goto f_err;
}
mac_size = (size_t)imac_size;
- OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
for (j = 0; j < num_recs; j++) {
- if (rr[j].length < mac_size) {
+ thisrr = &rr[j];
+
+ if (thisrr->length < mac_size) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
}
- rr[j].length -= mac_size;
- mac = rr[j].data + rr[j].length;
- i = s->method->ssl3_enc->mac(s, &rr[j], md, 0 /* not send */ );
- if (i < 0 || CRYPTO_memcmp(md, mac, mac_size) != 0) {
+ thisrr->length -= mac_size;
+ mac = thisrr->data + thisrr->length;
+ i = s->method->ssl3_enc->mac(s, thisrr, md, 0 /* not send */ );
+ if (i == 0 || CRYPTO_memcmp(md, mac, mac_size) != 0) {
al = SSL_AD_BAD_RECORD_MAC;
SSLerr(SSL_F_SSL3_GET_RECORD,
SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
}
enc_err = s->method->ssl3_enc->enc(s, rr, num_recs, 0);
+
/*-
* enc_err is:
* 0: (in non-constant time) if the record is publically invalid.
goto f_err;
}
#ifdef SSL_DEBUG
- printf("dec %ld\n", rr->length);
+ printf("dec %"OSSLzu"\n", rr[0].length);
{
size_t z;
- for (z = 0; z < rr->length; z++)
- printf("%02X%c", rr->data[z], ((z + 1) % 16) ? ' ' : '\n');
+ for (z = 0; z < rr[0].length; z++)
+ printf("%02X%c", rr[0].data[z], ((z + 1) % 16) ? ' ' : '\n');
}
printf("\n");
#endif
/* r->length is now the compressed data plus mac */
if ((sess != NULL) &&
(s->enc_read_ctx != NULL) &&
- (EVP_MD_CTX_md(s->read_hash) != NULL) && !SSL_USE_ETM(s)) {
+ (!SSL_READ_ETM(s) && EVP_MD_CTX_md(s->read_hash) != NULL)) {
/* s->read_hash != NULL => mac_size != -1 */
unsigned char *mac = NULL;
unsigned char mac_tmp[EVP_MAX_MD_SIZE];
OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
for (j = 0; j < num_recs; j++) {
+ thisrr = &rr[j];
/*
* orig_len is the length of the record before any padding was
* removed. This is public information, as is the MAC in use,
* therefore we can safely process the record in a different amount
* of time if it's too short to possibly contain a MAC.
*/
- if (rr[j].orig_len < mac_size ||
+ if (thisrr->orig_len < mac_size ||
/* CBC records must have a padding length byte too. */
(EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
- rr[j].orig_len < mac_size + 1)) {
+ thisrr->orig_len < mac_size + 1)) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
* contents of the padding bytes.
*/
mac = mac_tmp;
- ssl3_cbc_copy_mac(mac_tmp, &rr[j], mac_size);
- rr[j].length -= mac_size;
+ ssl3_cbc_copy_mac(mac_tmp, thisrr, mac_size);
+ thisrr->length -= mac_size;
} else {
/*
* In this case there's no padding, so |rec->orig_len| equals
* |rec->length| and we checked that there's enough bytes for
* |mac_size| above.
*/
- rr[j].length -= mac_size;
- mac = &rr[j].data[rr[j].length];
+ thisrr->length -= mac_size;
+ mac = &thisrr->data[thisrr->length];
}
- i = s->method->ssl3_enc->mac(s, &rr[j], md, 0 /* not send */ );
- if (i < 0 || mac == NULL
+ i = s->method->ssl3_enc->mac(s, thisrr, md, 0 /* not send */ );
+ if (i == 0 || mac == NULL
|| CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
enc_err = -1;
- if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)
+ if (thisrr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)
enc_err = -1;
}
}
}
for (j = 0; j < num_recs; j++) {
- /* rr[j].length is now just compressed */
+ thisrr = &rr[j];
+
+ /* thisrr->length is now just compressed */
if (s->expand != NULL) {
- if (rr[j].length > SSL3_RT_MAX_COMPRESSED_LENGTH) {
+ if (thisrr->length > SSL3_RT_MAX_COMPRESSED_LENGTH) {
al = SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG);
goto f_err;
}
- if (!ssl3_do_uncompress(s, &rr[j])) {
+ if (!ssl3_do_uncompress(s, thisrr)) {
al = SSL_AD_DECOMPRESSION_FAILURE;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION);
goto f_err;
}
}
- if (rr[j].length > SSL3_RT_MAX_PLAIN_LENGTH) {
+ if (SSL_IS_TLS13(s) && s->enc_read_ctx != NULL) {
+ size_t end;
+
+ if (thisrr->length == 0) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE);
+ goto f_err;
+ }
+
+ /* Strip trailing padding */
+ for (end = thisrr->length - 1; end > 0 && thisrr->data[end] == 0;
+ end--)
+ continue;
+
+ thisrr->length = end;
+ thisrr->type = thisrr->data[end];
+ if (thisrr->type != SSL3_RT_APPLICATION_DATA
+ && thisrr->type != SSL3_RT_ALERT
+ && thisrr->type != SSL3_RT_HANDSHAKE) {
+ al = SSL_AD_UNEXPECTED_MESSAGE;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_RECORD_TYPE);
+ goto f_err;
+ }
+ }
+
+ if (thisrr->length > SSL3_RT_MAX_PLAIN_LENGTH) {
al = SSL_AD_RECORD_OVERFLOW;
SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG);
goto f_err;
}
- rr[j].off = 0;
+ thisrr->off = 0;
/*-
* So at this point the following is true
- * rr[j].type is the type of record
- * rr[j].length == number of bytes in record
- * rr[j].off == offset to first valid byte
- * rr[j].data == where to take bytes from, increment after use :-).
+ * thisrr->type is the type of record
+ * thisrr->length == number of bytes in record
+ * thisrr->off == offset to first valid byte
+ * thisrr->data == where to take bytes from, increment after use :-).
*/
/* just read a 0 length packet */
- if (rr[j].length == 0) {
+ if (thisrr->length == 0) {
RECORD_LAYER_inc_empty_record_count(&s->rlayer);
if (RECORD_LAYER_get_empty_record_count(&s->rlayer)
> MAX_EMPTY_RECORDS) {
/* TODO(size_t): Convert this call */
i = COMP_compress_block(ssl->compress, wr->data,
- SSL3_RT_MAX_COMPRESSED_LENGTH,
+ (int)(wr->length + SSL3_RT_MAX_COMPRESSED_OVERHEAD),
wr->input, (int)wr->length);
if (i < 0)
return (0);
/* COMPRESS */
if ((bs != 1) && send) {
- i = bs - ((int)l % bs);
+ i = bs - (l % bs);
/* we need to add 'i-1' padding bytes */
l += i;
*/
memset(&rec->input[rec->length], 0, i);
rec->length += i;
- rec->input[l - 1] = (i - 1);
+ rec->input[l - 1] = (unsigned char)(i - 1);
}
if (!send) {
}
/* TODO(size_t): Convert this call */
- if (EVP_Cipher(ds, rec->data, rec->input, l) < 1)
+ if (EVP_Cipher(ds, rec->data, rec->input, (unsigned int)l) < 1)
return -1;
if (EVP_MD_CTX_md(s->read_hash) != NULL) {
buf[ctr][8] = recs[ctr].type;
buf[ctr][9] = (unsigned char)(s->version >> 8);
buf[ctr][10] = (unsigned char)(s->version);
- buf[ctr][11] = recs[ctr].length >> 8;
- buf[ctr][12] = recs[ctr].length & 0xff;
+ buf[ctr][11] = (unsigned char)(recs[ctr].length >> 8);
+ buf[ctr][12] = (unsigned char)(recs[ctr].length & 0xff);
pad = EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_AEAD_TLS1_AAD,
EVP_AEAD_TLS1_AAD_LEN, buf[ctr]);
if (pad <= 0)
}
} else if ((bs != 1) && send) {
- padnum = bs - ((int)reclen[ctr] % bs);
+ padnum = bs - (reclen[ctr] % bs);
/* Add weird padding of upto 256 bytes */
if (padnum > MAX_PADDING)
return -1;
/* we need to add 'padnum' padding bytes of value padval */
- padval = padnum - 1;
+ padval = (unsigned char)(padnum - 1);
for (loop = reclen[ctr]; loop < reclen[ctr] + padnum; loop++)
recs[ctr].input[loop] = padval;
reclen[ctr] += padnum;
data[ctr] = recs[ctr].data;
}
if (EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_OUTPUT_BUFS,
- n_recs, data) <= 0) {
+ (int)n_recs, data) <= 0) {
SSLerr(SSL_F_TLS1_ENC, SSL_R_PIPELINE_FAILURE);
}
/* Set the input buffers */
data[ctr] = recs[ctr].input;
}
if (EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_INPUT_BUFS,
- n_recs, data) <= 0
+ (int)n_recs, data) <= 0
|| EVP_CIPHER_CTX_ctrl(ds, EVP_CTRL_SET_PIPELINE_INPUT_LENS,
- n_recs, reclen) <= 0) {
+ (int)n_recs, reclen) <= 0) {
SSLerr(SSL_F_TLS1_ENC, SSL_R_PIPELINE_FAILURE);
return -1;
}
}
- tmpr = EVP_Cipher(ds, recs[0].data, recs[0].input, reclen[0]);
+ /* TODO(size_t): Convert this call */
+ tmpr = EVP_Cipher(ds, recs[0].data, recs[0].input,
+ (unsigned int)reclen[0]);
if ((EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ds))
& EVP_CIPH_FLAG_CUSTOM_CIPHER)
? (tmpr < 0)
}
ret = 1;
- if (!SSL_USE_ETM(s) && EVP_MD_CTX_md(s->read_hash) != NULL) {
+ if (!SSL_READ_ETM(s) && EVP_MD_CTX_md(s->read_hash) != NULL) {
imac_size = EVP_MD_CTX_size(s->read_hash);
if (imac_size < 0)
return -1;
const EVP_MD_CTX *hash;
unsigned char *p, rec_char;
size_t md_size;
- int npad;
+ size_t npad;
int t;
if (send) {
t = EVP_MD_CTX_size(hash);
if (t < 0)
- return -1;
+ return 0;
md_size = t;
npad = (48 / md_size) * md_size;
* total size.
*/
unsigned char header[75];
- unsigned j = 0;
+ size_t j = 0;
memcpy(header + j, mac_sec, md_size);
j += md_size;
memcpy(header + j, ssl3_pad_1, npad);
memcpy(header + j, seq, 8);
j += 8;
header[j++] = rec->type;
- header[j++] = rec->length >> 8;
- header[j++] = rec->length & 0xff;
+ header[j++] = (unsigned char)(rec->length >> 8);
+ header[j++] = (unsigned char)(rec->length & 0xff);
/* Final param == is SSLv3 */
if (ssl3_cbc_digest_record(hash,
header, rec->input,
rec->length + md_size, rec->orig_len,
mac_sec, md_size, 1) <= 0)
- return -1;
+ return 0;
} else {
unsigned int md_size_u;
/* Chop the digest off the end :-) */
EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
if (md_ctx == NULL)
- return -1;
+ return 0;
rec_char = rec->type;
p = md;
|| EVP_DigestUpdate(md_ctx, md, md_size) <= 0
|| EVP_DigestFinal_ex(md_ctx, md, &md_size_u) <= 0) {
EVP_MD_CTX_reset(md_ctx);
- return -1;
+ return 0;
}
- md_size = md_size_u;
EVP_MD_CTX_free(md_ctx);
}
ssl3_record_sequence_update(seq);
- return (md_size);
+ return 1;
}
int tls1_mac(SSL *ssl, SSL3_RECORD *rec, unsigned char *md, int send)
} else {
hmac = EVP_MD_CTX_new();
if (hmac == NULL || !EVP_MD_CTX_copy(hmac, hash))
- return -1;
+ return 0;
mac_ctx = hmac;
}
header[8] = rec->type;
header[9] = (unsigned char)(ssl->version >> 8);
header[10] = (unsigned char)(ssl->version);
- header[11] = (rec->length) >> 8;
- header[12] = (rec->length) & 0xff;
+ header[11] = (unsigned char)(rec->length >> 8);
+ header[12] = (unsigned char)(rec->length & 0xff);
- if (!send && !SSL_USE_ETM(ssl) &&
+ if (!send && !SSL_READ_ETM(ssl) &&
EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
ssl3_cbc_record_digest_supported(mac_ctx)) {
/*
* are hashing because that gives an attacker a timing-oracle.
*/
/* Final param == not SSLv3 */
- /* TODO(size_t): Convert this call */
if (ssl3_cbc_digest_record(mac_ctx,
md, &md_size,
header, rec->input,
|| EVP_DigestSignUpdate(mac_ctx, rec->input, rec->length) <= 0
|| EVP_DigestSignFinal(mac_ctx, md, &md_size) <= 0) {
EVP_MD_CTX_free(hmac);
- return -1;
+ return 0;
}
- if (!send && !SSL_USE_ETM(ssl) && FIPS_mode())
+ if (!send && !SSL_READ_ETM(ssl) && FIPS_mode())
if (!tls_fips_digest_extra(ssl->enc_read_ctx,
mac_ctx, rec->input,
rec->length, rec->orig_len)) {
EVP_MD_CTX_free(hmac);
- return -1;
+ return 0;
}
}
fprintf(stderr, "\n");
}
#endif
- return (md_size);
+ return 1;
}
/*-
size_t block_size, size_t mac_size)
{
size_t padding_length;
- unsigned good;
+ size_t good;
const size_t overhead = 1 /* padding length byte */ + mac_size;
/*
return 0;
padding_length = rec->data[rec->length - 1];
- good = constant_time_ge(rec->length, padding_length + overhead);
+ good = constant_time_ge_s(rec->length, padding_length + overhead);
/* SSLv3 requires that the padding is minimal. */
- good &= constant_time_ge(block_size, padding_length + 1);
+ good &= constant_time_ge_s(block_size, padding_length + 1);
rec->length -= good & (padding_length + 1);
- return constant_time_select_int(good, 1, -1);
+ return constant_time_select_int_s(good, 1, -1);
}
/*-
SSL3_RECORD *rec,
size_t block_size, size_t mac_size)
{
- unsigned good;
+ size_t good;
size_t padding_length, to_check, i;
const size_t overhead = 1 /* padding length byte */ + mac_size;
/* Check if version requires explicit IV */
return 1;
}
- good = constant_time_ge(rec->length, overhead + padding_length);
+ good = constant_time_ge_s(rec->length, overhead + padding_length);
/*
* The padding consists of a length byte at the end of the record and
* then that many bytes of padding, all with the same value as the length
to_check = rec->length;
for (i = 0; i < to_check; i++) {
- unsigned char mask = constant_time_ge_8(padding_length, i);
+ unsigned char mask = constant_time_ge_8_s(padding_length, i);
unsigned char b = rec->data[rec->length - 1 - i];
/*
* The final |padding_length+1| bytes should all have the value
* If any of the final |padding_length+1| bytes had the wrong value, one
* or more of the lower eight bits of |good| will be cleared.
*/
- good = constant_time_eq(0xff, good & 0xff);
+ good = constant_time_eq_s(0xff, good & 0xff);
rec->length -= good & (padding_length + 1);
- return constant_time_select_int(good, 1, -1);
+ return constant_time_select_int_s(good, 1, -1);
}
/*-
*/
size_t mac_end = rec->length;
size_t mac_start = mac_end - md_size;
+ size_t in_mac;
/*
* scan_start contains the number of bytes that we can ignore because the
* MAC's position can only vary by 255 bytes.
*/
size_t scan_start = 0;
- unsigned i, j;
- unsigned div_spoiler;
- unsigned rotate_offset;
+ size_t i, j;
+ size_t rotate_offset;
OPENSSL_assert(rec->orig_len >= md_size);
OPENSSL_assert(md_size <= EVP_MAX_MD_SIZE);
/* This information is public so it's safe to branch based on it. */
if (rec->orig_len > md_size + 255 + 1)
scan_start = rec->orig_len - (md_size + 255 + 1);
- /*
- * div_spoiler contains a multiple of md_size that is used to cause the
- * modulo operation to be constant time. Without this, the time varies
- * based on the amount of padding when running on Intel chips at least.
- * The aim of right-shifting md_size is so that the compiler doesn't
- * figure out that it can remove div_spoiler as that would require it to
- * prove that md_size is always even, which I hope is beyond it.
- */
- div_spoiler = md_size >> 1;
- div_spoiler <<= (sizeof(div_spoiler) - 1) * 8;
- rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;
+ in_mac = 0;
+ rotate_offset = 0;
memset(rotated_mac, 0, md_size);
for (i = scan_start, j = 0; i < rec->orig_len; i++) {
- unsigned char mac_started = constant_time_ge_8(i, mac_start);
- unsigned char mac_ended = constant_time_ge_8(i, mac_end);
+ size_t mac_started = constant_time_eq_s(i, mac_start);
+ size_t mac_ended = constant_time_lt_s(i, mac_end);
unsigned char b = rec->data[i];
- rotated_mac[j++] |= b & mac_started & ~mac_ended;
- j &= constant_time_lt(j, md_size);
+
+ in_mac |= mac_started;
+ in_mac &= mac_ended;
+ rotate_offset |= j & mac_started;
+ rotated_mac[j++] |= b & in_mac;
+ j &= constant_time_lt_s(j, md_size);
}
/* Now rotate the MAC */
/* in case cache-line is 32 bytes, touch second line */
((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32];
out[j++] = rotated_mac[rotate_offset++];
- rotate_offset &= constant_time_lt(rotate_offset, md_size);
+ rotate_offset &= constant_time_lt_s(rotate_offset, md_size);
}
#else
memset(out, 0, md_size);
rotate_offset = md_size - rotate_offset;
- rotate_offset &= constant_time_lt(rotate_offset, md_size);
+ rotate_offset &= constant_time_lt_s(rotate_offset, md_size);
for (i = 0; i < md_size; i++) {
for (j = 0; j < md_size; j++)
- out[j] |= rotated_mac[i] & constant_time_eq_8(j, rotate_offset);
+ out[j] |= rotated_mac[i] & constant_time_eq_8_s(j, rotate_offset);
rotate_offset++;
- rotate_offset &= constant_time_lt(rotate_offset, md_size);
+ rotate_offset &= constant_time_lt_s(rotate_offset, md_size);
}
#endif
}
rr->data = rr->input;
rr->orig_len = rr->length;
- if (SSL_USE_ETM(s) && s->read_hash) {
+ if (SSL_READ_ETM(s) && s->read_hash) {
unsigned char *mac;
mac_size = EVP_MD_CTX_size(s->read_hash);
OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
rr->length -= mac_size;
mac = rr->data + rr->length;
i = s->method->ssl3_enc->mac(s, rr, md, 0 /* not send */ );
- if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) {
+ if (i == 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) {
al = SSL_AD_BAD_RECORD_MAC;
SSLerr(SSL_F_DTLS1_PROCESS_RECORD,
SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
#endif
/* r->length is now the compressed data plus mac */
- if ((sess != NULL) && !SSL_USE_ETM(s) &&
+ if ((sess != NULL) && !SSL_READ_ETM(s) &&
(s->enc_read_ctx != NULL) && (EVP_MD_CTX_md(s->read_hash) != NULL)) {
/* s->read_hash != NULL => mac_size != -1 */
unsigned char *mac = NULL;
}
i = s->method->ssl3_enc->mac(s, rr, md, 0 /* not send */ );
- if (i < 0 || mac == NULL
+ if (i == 0 || mac == NULL
|| CRYPTO_memcmp(md, mac, mac_size) != 0)
enc_err = -1;
if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)