diff options
| -rw-r--r-- | networking/tls.c | 71 |
1 files changed, 52 insertions, 19 deletions
diff --git a/networking/tls.c b/networking/tls.c index 80e3bc6..8fa5329 100644 --- a/networking/tls.c +++ b/networking/tls.c @@ -228,6 +228,8 @@ struct record_hdr { typedef struct tls_state { int fd; +//TODO: store just the DER key here, parse/use/delete it when sending client key +//this way it will stay key type agnostic here. psRsaKey_t server_rsa_pub_key; sha256_ctx_t handshake_sha256_ctx; @@ -1066,7 +1068,7 @@ static void find_key_in_der_cert(tls_state_t *tls, uint8_t *der, int len) /* * TLS Handshake routines */ -static int xread_tls_handshake_block(tls_state_t *tls, int min_len) +static int tls_xread_handshake_block(tls_state_t *tls, int min_len) { struct record_hdr *xhdr; int len = tls_xread_record(tls); @@ -1098,7 +1100,7 @@ static ALWAYS_INLINE void fill_handshake_record_hdr(void *buf, unsigned type, un } //TODO: implement RFC 5746 (Renegotiation Indication Extension) - some servers will refuse to work with us otherwise -static void send_client_hello(tls_state_t *tls) +static void send_client_hello(tls_state_t *tls, const char *sni) { struct client_hello { uint8_t type; @@ -1111,28 +1113,58 @@ static void send_client_hello(tls_state_t *tls) uint8_t cipherid[2 * 1]; /* actually variable */ uint8_t comprtypes_len; uint8_t comprtypes[1]; /* actually variable */ + /* Extensions (SNI shown): + * hi,lo // len of all extensions + * 0x00,0x00 // extension_type: "Server Name" + * 0x00,0x0e // list len (there can be more than one SNI) + * 0x00,0x0c // len of 1st Server Name Indication + * 0x00 // name type: host_name + * 0x00,0x09 // name len + * "localhost" // name + */ }; - struct client_hello *record = tls_get_outbuf(tls, sizeof(*record)); - - fill_handshake_record_hdr(record, HANDSHAKE_CLIENT_HELLO, sizeof(*record)); + struct client_hello *record; + int len; + int sni_len = sni ? strnlen(sni, 127) : 0; + + len = sizeof(*record); + if (sni_len) + len += 11 + strlen(sni); + record = tls_get_outbuf(tls, len); + memset(record, 0, len); + fill_handshake_record_hdr(record, HANDSHAKE_CLIENT_HELLO, len); record->proto_maj = TLS_MAJ; /* the "requested" version of the protocol, */ record->proto_min = TLS_MIN; /* can be higher than one in record headers */ tls_get_random(record->rand32, sizeof(record->rand32)); if (TLS_DEBUG_FIXED_SECRETS) memset(record->rand32, 0x11, sizeof(record->rand32)); memcpy(tls->client_and_server_rand32, record->rand32, sizeof(record->rand32)); - record->session_id_len = 0; - record->cipherid_len16_hi = 0; + /* record->session_id_len = 0; - already is */ + /* record->cipherid_len16_hi = 0; */ record->cipherid_len16_lo = 2 * 1; record->cipherid[0] = CIPHER_ID >> 8; record->cipherid[1] = CIPHER_ID & 0xff; record->comprtypes_len = 1; - record->comprtypes[0] = 0; - -//TODO: send options, at least SNI. + /* record->comprtypes[0] = 0; */ + + if (sni_len) { + uint8_t *p = (void*)(record + 1); + //p[0] = 0; // + p[1] = sni_len + 9; //ext_len + //p[2] = 0; // + //p[3] = 0; //extension_type + //p[4] = 0; // + p[5] = sni_len + 5; //list len + //p[6] = 0; // + p[7] = sni_len + 3; //len of 1st SNI + //p[8] = 0; //name type + //p[9] = 0; // + p[10] = sni_len; //name len + memcpy(&p[11], sni, sni_len); + } dbg(">> CLIENT_HELLO\n"); - xwrite_and_update_handshake_hash(tls, sizeof(*record)); + xwrite_and_update_handshake_hash(tls, len); } static void get_server_hello(tls_state_t *tls) @@ -1149,10 +1181,11 @@ static void get_server_hello(tls_state_t *tls) uint8_t comprtype; /* extensions may follow, but only those which client offered in its Hello */ }; + struct server_hello *hp; uint8_t *cipherid; - xread_tls_handshake_block(tls, 74); + tls_xread_handshake_block(tls, 74); hp = (void*)tls->inbuf; // 74 bytes: @@ -1199,7 +1232,7 @@ static void get_server_cert(tls_state_t *tls) uint8_t *certbuf; int len, len1; - len = xread_tls_handshake_block(tls, 10); + len = tls_xread_handshake_block(tls, 10); xhdr = (void*)tls->inbuf; certbuf = (void*)(xhdr + 1); @@ -1416,7 +1449,7 @@ static void send_client_finished(tls_state_t *tls) xwrite_encrypted(tls, sizeof(*record), RECORD_TYPE_HANDSHAKE); } -static void tls_handshake(tls_state_t *tls) +static void tls_handshake(tls_state_t *tls, const char *sni) { // Client RFC 5246 Server // (*) - optional messages, not always sent @@ -1437,7 +1470,7 @@ static void tls_handshake(tls_state_t *tls) // Application Data <------> Application Data int len; - send_client_hello(tls); + send_client_hello(tls, sni); get_server_hello(tls); // RFC 5246 @@ -1451,7 +1484,7 @@ static void tls_handshake(tls_state_t *tls) // (for example, kernel.org does not even accept DH_anon cipher id) get_server_cert(tls); - len = xread_tls_handshake_block(tls, 4); + len = tls_xread_handshake_block(tls, 4); if (tls->inbuf[RECHDR_LEN] == HANDSHAKE_SERVER_KEY_EXCHANGE) { // 459 bytes: // 0c 00|01|c7 03|00|17|41|04|87|94|2e|2f|68|d0|c9|f4|97|a8|2d|ef|ed|67|ea|c6|f3|b3|56|47|5d|27|b6|bd|ee|70|25|30|5e|b0|8e|f6|21|5a... @@ -1460,7 +1493,7 @@ static void tls_handshake(tls_state_t *tls) // 0c 00|01|c9 03|00|17|41|04|cd|9b|b4|29|1f|f6|b0|c2|84|82|7f|29|6a|47|4e|ec|87|0b|c1|9c|69|e1|f8|c6|d0|53|e9|27|90|a5|c8|02|15|75... dbg("<< SERVER_KEY_EXCHANGE len:%u\n", len); //probably need to save it - xread_tls_handshake_block(tls, 4); + tls_xread_handshake_block(tls, 4); } // if (tls->inbuf[RECHDR_LEN] == HANDSHAKE_CERTIFICATE_REQUEST) { @@ -1472,7 +1505,7 @@ static void tls_handshake(tls_state_t *tls) // Client certificates are sent using the Certificate structure // defined in Section 7.4.2." // (i.e. the same format as server certs) -// xread_tls_handshake_block(tls, 4); +// tls_xread_handshake_block(tls, 4); // } if (tls->inbuf[RECHDR_LEN] != HANDSHAKE_SERVER_HELLO_DONE) @@ -1546,7 +1579,7 @@ int tls_main(int argc UNUSED_PARAM, char **argv) tls = new_tls_state(); tls->fd = cfd; - tls_handshake(tls); + tls_handshake(tls, argv[1]); /* Select loop copying stdin to cfd, and cfd to stdout */ FD_ZERO(&readfds); |