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Merge branch '2611-doth-failure' into 'main'

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Fix "doth" system test failure with SSL_ERROR_SYSCALL (5)

See merge request isc-projects/bind9!4863
This commit is contained in:
Artem Boldariev
2021-04-07 08:44:38 +00:00
parent 6b121171a5 ee10948e2d
commit d1bb1b01b9
1 changed files with 32 additions and 9 deletions
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41
lib/isc/netmgr/tlsstream.c
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@@ -9,6 +9,7 @@
* information regarding copyright ownership.
*/
#include <errno.h>
#include <libgen.h>
#include <unistd.h>
#include <uv.h>
@@ -327,8 +328,8 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
isc_result_t result = ISC_R_SUCCESS;
int pending, tls_status = SSL_ERROR_NONE;
int rv = 0;
bool sent_shutdown = false, received_shutdown = false;
size_t len = 0;
int saved_errno = 0;
REQUIRE(VALID_NMSOCK(sock));
REQUIRE(sock->tid == isc_nm_tid());
@@ -359,6 +360,7 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
received_data->length, &len);
if (rv <= 0 || len != received_data->length) {
result = ISC_R_TLSERROR;
saved_errno = errno;
goto error;
}
@@ -372,7 +374,7 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
} else if (send_data != NULL) {
INSIST(received_data == NULL);
INSIST(sock->tlsstream.state > TLS_HANDSHAKE);
received_shutdown =
bool received_shutdown =
((SSL_get_shutdown(sock->tlsstream.tls) &
SSL_RECEIVED_SHUTDOWN) != 0);
rv = SSL_write_ex(sock->tlsstream.tls,
@@ -410,6 +412,28 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
}
}
tls_status = SSL_get_error(sock->tlsstream.tls, rv);
saved_errno = errno;
/* See "BUGS" section at:
* https://www.openssl.org/docs/man1.1.1/man3/SSL_get_error.html
*
* It is mentioned there that when TLS status equals
* SSL_ERROR_SYSCALL AND errno == 0 it means that underlying
* transport layer returned EOF prematurely. However, we are
* managing the transport ourselves, so we should just resume
* reading from the TCP socket.
*
* It seems that this case has been handled properly on modern
* versions of OpenSSL. That being said, the situation goes in
* line with the manual: it is briefly mentioned there that
* SSL_ERROR_SYSCALL might be returned not only in a case of
* low-level errors (like system call failures).
*/
if (tls_status == SSL_ERROR_SYSCALL && saved_errno == 0 &&
received_data == NULL && send_data == NULL && finish == false)
{
tls_status = SSL_ERROR_WANT_READ;
}
pending = tls_process_outgoing(sock, finish, send_data);
if (pending > 0) {
@@ -420,11 +444,6 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
switch (tls_status) {
case SSL_ERROR_NONE:
case SSL_ERROR_ZERO_RETURN:
if (sent_shutdown && received_shutdown) {
/* clean shutdown */
isc_nm_cancelread(sock->outerhandle);
isc__nm_tls_close(sock);
};
return;
case SSL_ERROR_WANT_WRITE:
if (sock->tlsstream.nsending == 0) {
@@ -451,8 +470,12 @@ tls_do_bio(isc_nmsocket_t *sock, isc_region_t *received_data,
error:
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_NETMGR,
ISC_LOG_ERROR, "SSL error in BIO: %d %s", tls_status,
isc_result_totext(result));
ISC_LOG_NOTICE,
"SSL error in BIO: %d %s (errno: %d). Arguments: "
"received_data: %p, "
"send_data: %p, finish: %s",
tls_status, isc_result_totext(result), saved_errno,
received_data, send_data, finish ? "true" : "false");
tls_failed_read_cb(sock, result);
}