diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/crypt_ops/crypto_curve25519.c | 2 | ||||
| -rw-r--r-- | src/lib/fs/freespace.c | 1 | ||||
| -rw-r--r-- | src/lib/tls/tortls_openssl.c | 46 |
3 files changed, 47 insertions, 2 deletions
diff --git a/src/lib/crypt_ops/crypto_curve25519.c b/src/lib/crypt_ops/crypto_curve25519.c index e6a39a8c08..f3a9de9fc5 100644 --- a/src/lib/crypt_ops/crypto_curve25519.c +++ b/src/lib/crypt_ops/crypto_curve25519.c @@ -289,7 +289,7 @@ curve25519_basepoint_spot_check(void) 0x0d,0xbf,0x3a,0x0d,0x26,0x38,0x1a,0xf4, 0xeb,0xa4,0xa9,0x8e,0xaa,0x9b,0x4e,0x6a }; - const int loop_max=200; + const int loop_max=8; int save_use_ed = curve25519_use_ed; unsigned char e1[32], e2[32]; unsigned char x[32],y[32]; diff --git a/src/lib/fs/freespace.c b/src/lib/fs/freespace.c index 2dbba3c5f8..c18b1e0234 100644 --- a/src/lib/fs/freespace.c +++ b/src/lib/fs/freespace.c @@ -19,6 +19,7 @@ #include <windows.h> #endif +#include <errno.h> #include <string.h> /** Return the amount of free disk space we have permission to use, in diff --git a/src/lib/tls/tortls_openssl.c b/src/lib/tls/tortls_openssl.c index 63f6259a6c..99371cfc40 100644 --- a/src/lib/tls/tortls_openssl.c +++ b/src/lib/tls/tortls_openssl.c @@ -99,6 +99,9 @@ ENABLE_GCC_WARNING(redundant-decls) #define SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION 0x0010 #endif +/** Set to true iff openssl bug 7712 has been detected. */ +static int openssl_bug_7712_is_present = 0; + /** Return values for tor_tls_classify_client_ciphers. * * @{ @@ -1054,6 +1057,13 @@ tor_tls_new(tor_socket_t sock, int isServer) } #endif /* defined(SSL_set_tlsext_host_name) */ +#ifdef SSL_CTRL_SET_MAX_PROTO_VERSION + if (openssl_bug_7712_is_present) { + /* We can't actually use TLS 1.3 until this bug is fixed. */ + SSL_set_max_proto_version(result->ssl, TLS1_2_VERSION); + } +#endif + if (!SSL_set_cipher_list(result->ssl, isServer ? SERVER_CIPHER_LIST : CLIENT_CIPHER_LIST)) { tls_log_errors(NULL, LOG_WARN, LD_NET, "setting ciphers"); @@ -1671,7 +1681,8 @@ tor_tls_get_tlssecrets,(tor_tls_t *tls, uint8_t *secrets_out)) * provided <b>context</b> (<b>context_len</b> bytes long) and * <b>label</b> (a NUL-terminated string), compute a 32-byte secret in * <b>secrets_out</b> that only the parties to this TLS session can - * compute. Return 0 on success and -1 on failure. + * compute. Return 0 on success; -1 on failure; and -2 on failure + * caused by OpenSSL bug 7712. */ MOCK_IMPL(int, tor_tls_export_key_material,(tor_tls_t *tls, uint8_t *secrets_out, @@ -1686,6 +1697,39 @@ tor_tls_export_key_material,(tor_tls_t *tls, uint8_t *secrets_out, secrets_out, DIGEST256_LEN, label, strlen(label), context, context_len, 1); + + if (r != 1) { + int severity = openssl_bug_7712_is_present ? LOG_WARN : LOG_DEBUG; + tls_log_errors(tls, severity, LD_NET, "exporting keying material"); + } + +#ifdef TLS1_3_VERSION + if (r != 1 && + strlen(label) > 12 && + SSL_version(tls->ssl) >= TLS1_3_VERSION) { + + if (! openssl_bug_7712_is_present) { + /* We might have run into OpenSSL issue 7712, which caused OpenSSL + * 1.1.1a to not handle long labels. Let's test to see if we have. + */ + r = SSL_export_keying_material(tls->ssl, secrets_out, DIGEST256_LEN, + "short", 5, context, context_len, 1); + if (r == 1) { + /* A short label succeeds, but a long label fails. This was openssl + * issue 7712. */ + openssl_bug_7712_is_present = 1; + log_warn(LD_GENERAL, "Detected OpenSSL bug 7712: disabling TLS 1.3 on " + "future connections. A fix is expected to appear in OpenSSL " + "1.1.1b."); + } + } + if (openssl_bug_7712_is_present) + return -2; + else + return -1; + } +#endif + return (r == 1) ? 0 : -1; } |