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tls: improve i/o loop
With tls_has_buffered_record(), entire kernel.org response is printed at once, without 6 second pause to see its delayed EOF. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
e7863f394e
commit
38972a8df1
130
networking/tls.c
130
networking/tls.c
@ -48,7 +48,7 @@
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# define dump_raw_out(...) ((void)0)
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#endif
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#if 1
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#if 0
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# define dump_raw_in(...) dump_hex(__VA_ARGS__)
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#else
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# define dump_raw_in(...) ((void)0)
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@ -72,9 +72,6 @@
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#define HANDSHAKE_CLIENT_KEY_EXCHANGE 16
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#define HANDSHAKE_FINISHED 20
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#define SSL_HS_RANDOM_SIZE 32
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#define SSL_HS_RSA_PREMASTER_SIZE 48
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#define SSL_NULL_WITH_NULL_NULL 0x0000
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#define SSL_RSA_WITH_NULL_MD5 0x0001
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#define SSL_RSA_WITH_NULL_SHA 0x0002
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@ -175,12 +172,15 @@ enum {
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AES128_KEYSIZE = 16,
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AES256_KEYSIZE = 32,
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RSA_PREMASTER_SIZE = 48,
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RECHDR_LEN = 5,
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MAX_TLS_RECORD = (1 << 14),
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/* 8 = 3+5. 3 extra bytes result in record data being 32-bit aligned */
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OUTBUF_PFX = 8 + AES_BLOCKSIZE, /* header + IV */
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OUTBUF_SFX = SHA256_OUTSIZE + AES_BLOCKSIZE, /* MAC + padding */
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MAX_OTBUF = MAX_TLS_RECORD - OUTBUF_PFX - OUTBUF_SFX,
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MAX_OUTBUF = MAX_TLS_RECORD - OUTBUF_PFX - OUTBUF_SFX,
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};
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struct record_hdr {
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@ -205,20 +205,21 @@ typedef struct tls_state {
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uint8_t server_write_MAC_key[SHA256_OUTSIZE];
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uint8_t client_write_key[AES256_KEYSIZE];
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uint8_t server_write_key[AES256_KEYSIZE];
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// RFC 5246
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// sequence number
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// Each connection state contains a sequence number, which is
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// maintained separately for read and write states. The sequence
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// number MUST be set to zero whenever a connection state is made the
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// active state. Sequence numbers are of type uint64 and may not
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// exceed 2^64-1.
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// RFC 5246
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// sequence number
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// Each connection state contains a sequence number, which is
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// maintained separately for read and write states. The sequence
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// number MUST be set to zero whenever a connection state is made the
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// active state. Sequence numbers are of type uint64 and may not
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// exceed 2^64-1.
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uint64_t write_seq64_be;
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int outbuf_size;
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uint8_t *outbuf;
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// RFC 5246
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// |6.2.1. Fragmentation
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// | 6.2.1. Fragmentation
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// | The record layer fragments information blocks into TLSPlaintext
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// | records carrying data in chunks of 2^14 bytes or less. Client
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// | message boundaries are not preserved in the record layer (i.e.,
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@ -290,6 +291,9 @@ static void dump_tls_record(const void *vp, int len)
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len -= xhdr_len;
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}
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}
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#else
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# define dump_hex(...) ((void)0)
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# define dump_tls_record(...) ((void)0)
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#endif
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void tls_get_random(void *buf, unsigned len)
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@ -480,12 +484,19 @@ static tls_state_t *new_tls_state(void)
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static void tls_error_die(tls_state_t *tls)
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{
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dump_tls_record(tls->inbuf, tls->insize + tls->tail);
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xfunc_die();
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bb_error_msg_and_die("TODO: useful diagnostic about %p", tls);
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}
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static void tls_free_outbuf(tls_state_t *tls)
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{
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free(tls->outbuf);
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tls->outbuf_size = 0;
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tls->outbuf = NULL;
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}
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static void *tls_get_outbuf(tls_state_t *tls, int len)
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{
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if (len > MAX_OTBUF)
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if (len > MAX_OUTBUF)
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xfunc_die();
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if (tls->outbuf_size < len + OUTBUF_PFX + OUTBUF_SFX) {
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tls->outbuf_size = len + OUTBUF_PFX + OUTBUF_SFX;
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@ -670,7 +681,22 @@ static void xwrite_and_update_handshake_hash(tls_state_t *tls, unsigned size)
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xwrite_encrypted(tls, size, RECORD_TYPE_HANDSHAKE);
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}
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static int xread_tls_block(tls_state_t *tls)
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static int tls_has_buffered_record(tls_state_t *tls)
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{
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int buffered = tls->tail;
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struct record_hdr *xhdr;
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int rec_size;
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if (buffered < RECHDR_LEN)
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return 0;
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xhdr = (void*)(tls->inbuf + tls->insize);
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rec_size = RECHDR_LEN + (0x100 * xhdr->len16_hi + xhdr->len16_lo);
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if (buffered < rec_size)
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return 0;
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return rec_size;
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}
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static int tls_xread_record(tls_state_t *tls)
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{
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struct record_hdr *xhdr;
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int sz;
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@ -1012,7 +1038,7 @@ static void find_key_in_der_cert(tls_state_t *tls, uint8_t *der, int len)
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static int xread_tls_handshake_block(tls_state_t *tls, int min_len)
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{
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struct record_hdr *xhdr;
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int len = xread_tls_block(tls);
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int len = tls_xread_record(tls);
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xhdr = (void*)tls->inbuf;
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if (len < min_len
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@ -1177,7 +1203,7 @@ static void send_client_key_exchange(tls_state_t *tls)
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};
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//FIXME: better size estimate
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struct client_key_exchange *record = tls_get_outbuf(tls, sizeof(*record));
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uint8_t rsa_premaster[SSL_HS_RSA_PREMASTER_SIZE];
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uint8_t rsa_premaster[RSA_PREMASTER_SIZE];
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int len;
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tls_get_random(rsa_premaster, sizeof(rsa_premaster));
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@ -1383,7 +1409,7 @@ static void tls_handshake(tls_state_t *tls)
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send_client_hello(tls);
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get_server_hello(tls);
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//RFC 5246
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// RFC 5246
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// The server MUST send a Certificate message whenever the agreed-
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// upon key exchange method uses certificates for authentication
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// (this includes all key exchange methods defined in this document
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@ -1408,7 +1434,7 @@ static void tls_handshake(tls_state_t *tls)
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// if (tls->inbuf[RECHDR_LEN] == HANDSHAKE_CERTIFICATE_REQUEST) {
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// dbg("<< CERTIFICATE_REQUEST\n");
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//RFC 5246: (in response to this,) "If no suitable certificate is available,
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// RFC 5246: (in response to this,) "If no suitable certificate is available,
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// the client MUST send a certificate message containing no
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// certificates. That is, the certificate_list structure has a
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// length of zero. ...
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@ -1433,7 +1459,7 @@ static void tls_handshake(tls_state_t *tls)
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send_client_finished(tls);
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/* Get CHANGE_CIPHER_SPEC */
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len = xread_tls_block(tls);
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len = tls_xread_record(tls);
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if (len != 1 || memcmp(tls->inbuf, rec_CHANGE_CIPHER_SPEC, 6) != 0)
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tls_error_die(tls);
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dbg("<< CHANGE_CIPHER_SPEC\n");
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@ -1444,7 +1470,7 @@ static void tls_handshake(tls_state_t *tls)
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tls->min_encrypted_len_on_read = AES_BLOCKSIZE + SHA256_OUTSIZE + AES_BLOCKSIZE;
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/* Get (encrypted) FINISHED from the server */
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len = xread_tls_block(tls);
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len = tls_xread_record(tls);
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if (len < 4 || tls->inbuf[RECHDR_LEN] != HANDSHAKE_FINISHED)
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tls_error_die(tls);
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dbg("<< FINISHED\n");
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@ -1473,9 +1499,12 @@ int tls_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tls_main(int argc UNUSED_PARAM, char **argv)
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{
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tls_state_t *tls;
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fd_set readfds, testfds;
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fd_set readfds;
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int inbuf_size;
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const int INBUF_STEP = 4 * 1024;
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int cfd;
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// INIT_G();
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// getopt32(argv, "myopts")
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@ -1493,13 +1522,12 @@ int tls_main(int argc UNUSED_PARAM, char **argv)
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FD_SET(cfd, &readfds);
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FD_SET(STDIN_FILENO, &readfds);
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//#define iobuf bb_common_bufsiz1
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// setup_common_bufsiz();
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inbuf_size = INBUF_STEP;
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for (;;) {
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fd_set testfds;
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int nread;
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testfds = readfds;
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if (select(cfd + 1, &testfds, NULL, NULL, NULL) < 0)
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bb_perror_msg_and_die("select");
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@ -1507,26 +1535,52 @@ int tls_main(int argc UNUSED_PARAM, char **argv)
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void *buf;
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dbg("STDIN HAS DATA\n");
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//TODO: growable buffer
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buf = tls_get_outbuf(tls, 4 * 1024);
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nread = safe_read(STDIN_FILENO, buf, 4 * 1024);
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buf = tls_get_outbuf(tls, inbuf_size);
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nread = safe_read(STDIN_FILENO, buf, inbuf_size);
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if (nread < 1) {
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//&& errno != EAGAIN
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/* We'd want to do this: */
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/* Close outgoing half-connection so they get EOF,
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* but leave incoming alone so we can see response */
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//TLS has no way to encode this, doubt it's ok to do it "raw"
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// shutdown(cfd, SHUT_WR);
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* but leave incoming alone so we can see response
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*/
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//shutdown(cfd, SHUT_WR);
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/* But TLS has no way to encode this,
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* doubt it's ok to do it "raw"
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*/
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FD_CLR(STDIN_FILENO, &readfds);
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tls_free_outbuf(tls);
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} else {
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if (nread == inbuf_size) {
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/* TLS has per record overhead, if input comes fast,
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* read, encrypt and send bigger chunks
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*/
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inbuf_size += INBUF_STEP;
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if (inbuf_size > MAX_OUTBUF)
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inbuf_size = MAX_OUTBUF;
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}
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tls_xwrite(tls, nread);
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}
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tls_xwrite(tls, nread);
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}
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if (FD_ISSET(cfd, &testfds)) {
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dbg("NETWORK HAS DATA\n");
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nread = xread_tls_block(tls);
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if (nread < 1)
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//TODO: if eof, just close stdout, but not exit!
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return EXIT_SUCCESS;
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read_record:
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nread = tls_xread_record(tls);
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if (nread < 1) {
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/* TLS protocol has no real concept of one-sided shutdowns:
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* if we get "TLS EOF" from the peer, writes will fail too
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*/
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//FD_CLR(cfd, &readfds);
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//close(STDOUT_FILENO);
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//continue;
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break;
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}
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if (tls->inbuf[0] != RECORD_TYPE_APPLICATION_DATA)
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bb_error_msg_and_die("unexpected record type %d", tls->inbuf[0]);
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xwrite(STDOUT_FILENO, tls->inbuf + RECHDR_LEN, nread);
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/* We may already have a complete next record buffered,
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* can process it without network reads (and possible blocking)
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*/
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if (tls_has_buffered_record(tls))
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goto read_record;
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}
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}
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