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SSL: workaround for incorrect SSL_write() errors in OpenSSL 1.1.1.

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OpenSSL 1.1.1 fails to return SSL_ERROR_SYSCALL if an error happens
during SSL_write() after close_notify alert from the peer, and returns
SSL_ERROR_ZERO_RETURN instead.  Broken by this commit, which removes
the "i == 0" check around the SSL_RECEIVED_SHUTDOWN one:

https://git.openssl.org/?p=openssl.git;a=commitdiff;h=8051ab2

In particular, if a client closed the connection without reading
the response but with properly sent close_notify alert, this resulted in
unexpected "SSL_write() failed while ..." critical log message instead
of correct "SSL_write() failed (32: Broken pipe)" at the info level.

Since SSL_ERROR_ZERO_RETURN cannot be legitimately returned after
SSL_write(), the fix is to convert all SSL_ERROR_ZERO_RETURN errors
after SSL_write() to SSL_ERROR_SYSCALL.
This commit is contained in:
Maxim Dounin 2020-09-16 18:26:22 +03:00
parent dc1b14126e
commit 82cf625ab5
1 changed files with 12 additions and 0 deletions
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12
src/event/ngx_event_openssl.c
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@ -2573,6 +2573,18 @@ ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size)
sslerr = SSL_get_error(c->ssl->connection, n);
if (sslerr == SSL_ERROR_ZERO_RETURN) {
/*
* OpenSSL 1.1.1 fails to return SSL_ERROR_SYSCALL if an error
* happens during SSL_write() after close_notify alert from the
* peer, and returns SSL_ERROR_ZERO_RETURN instead,
* https://git.openssl.org/?p=openssl.git;a=commitdiff;h=8051ab2
*/
sslerr = SSL_ERROR_SYSCALL;
}
err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);