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SSL: avoid reading on pending SSL_write_early_data().

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If SSL_write_early_data() returned SSL_ERROR_WANT_WRITE, stop further reading
using a newly introduced c->ssl->write_blocked flag, as otherwise this would
result in SSL error "ssl3_write_bytes:bad length".  Eventually, normal reading
will be restored by read event posted from successful SSL_write_early_data().

While here, place "SSL_write_early_data: want write" debug on the path.
This commit is contained in:
Sergey Kandaurov 2018-12-18 15:15:15 +03:00
parent ce4a23d144
commit 2a11bf0f77
2 changed files with 21 additions and 0 deletions
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20
src/event/ngx_event_openssl.c
View File

@ -1839,6 +1839,10 @@ ngx_ssl_recv_early(ngx_connection_t *c, u_char *buf, size_t size)
buf += 1;
}
if (c->ssl->write_blocked) {
return NGX_AGAIN;
}
/*
* SSL_read_early_data() may return data in parts, so try to read
* until SSL_read_early_data() would return no data
@ -2339,6 +2343,11 @@ ngx_ssl_write_early(ngx_connection_t *c, u_char *data, size_t size)
ngx_post_event(c->read, &ngx_posted_events);
}
if (c->ssl->write_blocked) {
c->ssl->write_blocked = 0;
ngx_post_event(c->read, &ngx_posted_events);
}
c->sent += written;
return written;
@ -2352,6 +2361,9 @@ ngx_ssl_write_early(ngx_connection_t *c, u_char *data, size_t size)
if (sslerr == SSL_ERROR_WANT_WRITE) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
"SSL_write_early_data: want write");
if (c->ssl->saved_read_handler) {
c->read->handler = c->ssl->saved_read_handler;
@ -2365,6 +2377,14 @@ ngx_ssl_write_early(ngx_connection_t *c, u_char *data, size_t size)
ngx_post_event(c->read, &ngx_posted_events);
}
/*
* OpenSSL 1.1.1a fails to handle SSL_read_early_data()
* if an SSL_write_early_data() call blocked on writing,
* see https://github.com/openssl/openssl/issues/7757
*/
c->ssl->write_blocked = 1;
c->write->ready = 0;
return NGX_AGAIN;
}

1
src/event/ngx_event_openssl.h
View File

@ -98,6 +98,7 @@ struct ngx_ssl_connection_s {
unsigned try_early_data:1;
unsigned in_early:1;
unsigned early_preread:1;
unsigned write_blocked:1;
};