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| author | Jouni Malinen <j@w1.fi> | 2011-10-23 13:04:32 +0300 |
|---|---|---|
| committer | Jouni Malinen <j@w1.fi> | 2011-10-23 13:04:32 +0300 |
| commit | 3803bd331de647bb99a80db00cf19361b0b04be2 (patch) | |
| tree | aff8e98f0af5257b8dfef9f86d0195ebd4372d82 /src | |
| parent | 46eeedac610c36c9c69596d955e2e2c6c43d9b75 (diff) | |
| download | external_wpa_supplicant_8_ti-3803bd331de647bb99a80db00cf19361b0b04be2.zip external_wpa_supplicant_8_ti-3803bd331de647bb99a80db00cf19361b0b04be2.tar.gz external_wpa_supplicant_8_ti-3803bd331de647bb99a80db00cf19361b0b04be2.tar.bz2 | |
TLS: Validate RSA ClientKeyExchange length field
Instead of using implicit length based on the received buffer, validate
RSA ClientKeyExchange based on the explicit length field.
Diffstat (limited to 'src')
| -rw-r--r-- | src/tls/tlsv1_server_read.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/src/tls/tlsv1_server_read.c b/src/tls/tlsv1_server_read.c index 5b7ccc3..9ffe05c 100644 --- a/src/tls/tlsv1_server_read.c +++ b/src/tls/tlsv1_server_read.c @@ -494,6 +494,14 @@ static int tls_process_client_key_exchange_rsa( encr_len = WPA_GET_BE16(pos); pos += 2; + if (pos + encr_len > end) { + wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientKeyExchange " + "format: encr_len=%u left=%u", + encr_len, (unsigned int) (end - pos)); + tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, + TLS_ALERT_DECODE_ERROR); + return -1; + } outbuflen = outlen = end - pos; out = os_malloc(outlen >= TLS_PRE_MASTER_SECRET_LEN ? @@ -523,21 +531,21 @@ static int tls_process_client_key_exchange_rsa( */ if (crypto_private_key_decrypt_pkcs1_v15(conn->cred->key, - pos, end - pos, + pos, encr_len, out, &outlen) < 0) { wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt " - "PreMasterSecret (encr_len=%d outlen=%lu)", - (int) (end - pos), (unsigned long) outlen); + "PreMasterSecret (encr_len=%u outlen=%lu)", + encr_len, (unsigned long) outlen); use_random = 1; } - if (outlen != TLS_PRE_MASTER_SECRET_LEN) { + if (!use_random && outlen != TLS_PRE_MASTER_SECRET_LEN) { wpa_printf(MSG_DEBUG, "TLSv1: Unexpected PreMasterSecret " "length %lu", (unsigned long) outlen); use_random = 1; } - if (WPA_GET_BE16(out) != conn->client_version) { + if (!use_random && WPA_GET_BE16(out) != conn->client_version) { wpa_printf(MSG_DEBUG, "TLSv1: Client version in " "ClientKeyExchange does not match with version in " "ClientHello"); |