53 lines
2.2 KiB
Diff
53 lines
2.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <j@w1.fi>
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Date: Sun, 22 May 2022 17:01:35 +0300
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Subject: [PATCH] OpenSSL: Drop security level to 0 with OpenSSL 3.0 when using
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TLS 1.0/1.1
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Commit 9afb68b03976 ("OpenSSL: Allow systemwide secpolicy overrides for
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TLS version") with commit 58bbcfa31b18 ("OpenSSL: Update security level
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drop for TLS 1.0/1.1 with OpenSSL 3.0") allow this workaround to be
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enabled with an explicit network configuration parameter. However, the
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default settings are still allowing TLS 1.0 and 1.1 to be negotiated
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just to see them fail immediately when using OpenSSL 3.0. This is not
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exactly helpful especially when the OpenSSL error message for this
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particular case is "internal error" which does not really say anything
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about the reason for the error.
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It is is a bit inconvenient to update the security policy for this
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particular issue based on the negotiated TLS version since that happens
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in the middle of processing for the first message from the server.
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However, this can be done by using the debug callback for printing out
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the received TLS messages during processing.
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Drop the OpenSSL security level to 0 if that is the only option to
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continue the TLS negotiation, i.e., when TLS 1.0/1.1 are still allowed
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in wpa_supplicant default configuration and OpenSSL 3.0 with the
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constraint on MD5-SHA1 use.
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Signed-off-by: Jouni Malinen <j@w1.fi>
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---
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src/crypto/tls_openssl.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/crypto/tls_openssl.c b/src/crypto/tls_openssl.c
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index ad3aa1a7a7bb..dad1135c692d 100644
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--- a/src/crypto/tls_openssl.c
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+++ b/src/crypto/tls_openssl.c
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@@ -1516,6 +1516,15 @@ static void tls_msg_cb(int write_p, int version, int content_type,
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struct tls_connection *conn = arg;
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const u8 *pos = buf;
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+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
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+ if ((SSL_version(ssl) == TLS1_VERSION ||
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+ SSL_version(ssl) == TLS1_1_VERSION) &&
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+ SSL_get_security_level(ssl) > 0) {
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+ wpa_printf(MSG_DEBUG,
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+ "OpenSSL: Drop security level to 0 to allow TLS 1.0/1.1 use of MD5-SHA1 signature algorithm");
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+ SSL_set_security_level(ssl, 0);
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+ }
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+#endif /* OpenSSL version >= 3.0 */
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if (write_p == 2) {
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wpa_printf(MSG_DEBUG,
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"OpenSSL: session ver=0x%x content_type=%d",
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