https://bugs.openldap.org/show_bug.cgi?id=10205
Issue ID: 10205
Summary: SSL handshake blocks forever in async mode if server
unaccessible
Product: OpenLDAP
Version: 2.5.17
Hardware: x86_64
OS: Linux
Status: UNCONFIRMED
Keywords: needs_review
Severity: normal
Priority: ---
Component: libraries
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
When ldaps:// scheme is used to connect to currently unaccessible server with
LDAP_OPT_CONNECT_ASYNC and LDAP_OPT_NETWORK_TIMEOUT options set, it blocks
forever on SSL_connect.
Here is a trace:
ldap_sasl_bind
ldap_send_initial_request
ldap_new_connection 1 1 0
ldap_int_open_connection
ldap_connect_to_host: TCP winserv.test.net:636
ldap_new_socket: 3
ldap_prepare_socket: 3
ldap_connect_to_host: Trying 192.168.56.2:636
ldap_pvt_connect: fd: 3 tm: 30 async: -1
ldap_ndelay_on: 3
attempting to connect:
connect errno: 115
ldap_int_poll: fd: 3 tm: 0
ldap_err2string
[2024-04-25 15:41:27.112] [error] [:1] bind(): Connecting (X)
[2024-04-25 15:41:27.112] [error] [:1] err: -18
ldap_sasl_bind
ldap_send_initial_request
ldap_int_poll: fd: 3 tm: 0
ldap_is_sock_ready: 3
ldap_ndelay_off: 3
TLS trace: SSL_connect:before SSL initialization
TLS trace: SSL_connect:SSLv3/TLS write client hello
Looks like it happens because non-blocking mode is cleared from the socket
(ldap_ndelay_off) after the first poll for write, and non-blocking mode is
never restored before attempt to do tls connect, because of the check that
assumes that non-blocking mode has already been set for async mode:
if ( !async ) {
/* if async, this has already been set */
ber_sockbuf_ctrl( sb, LBER_SB_OPT_SET_NONBLOCK, (void*)1 );
}
while in fact it was cleared.
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