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Only signal "stream negotiation success" once.
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The code-path which checks whether the server requires an "xmpp-session"
was untested and therefore the connection-callback handler was triggered
twice with the state `XMPP_CONN_CONNECT`. This happened if the server
supports stream-management and requires a session.

Reported via profanity-im/profanity#1954

Fixup of c7d410f

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
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@sjaeckel
sjaeckel committed Feb 14, 2024
1 parent 5edc480 commit 1cf09b1
Showing 1 changed file with 72 additions and 57 deletions.
129 changes: 72 additions & 57 deletions src/auth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,9 +1095,8 @@ static int _handle_features_compress(xmpp_conn_t *conn,
static int
_handle_features_sasl(xmpp_conn_t *conn, xmpp_stanza_t *stanza, void *userdata)
{
xmpp_stanza_t *bind, *session, *opt;
xmpp_stanza_t *bind, *session;
xmpp_stanza_t *resume;
const char *ns;
char h[11];

UNUSED(userdata);
Expand All @@ -1118,14 +1117,20 @@ _handle_features_sasl(xmpp_conn_t *conn, xmpp_stanza_t *stanza, void *userdata)
conn->bind_required = 0;
}

/* check whether session establishment is required */
session = xmpp_stanza_get_child_by_name(stanza, "session");
/* Check whether session establishment is required.
*
* The mechanism is deprecated, but we still support it.
*
* RFC3921 contains Ch. 3 "Session Establishment".
*
* RFC6121 removes this and explains in Ch. 1.4:
* "Interoperability Note: [...] Implementation and deployment experience
* has shown that this additional step is unnecessary. [...]" */
session = xmpp_stanza_get_child_by_name_and_ns(stanza, "session",
XMPP_NS_SESSION);
if (session) {
ns = xmpp_stanza_get_ns(session);
opt = xmpp_stanza_get_child_by_name(session, "optional");
if (!opt)
conn->session_required =
ns != NULL && strcmp(ns, XMPP_NS_SESSION) == 0;
conn->session_required =
xmpp_stanza_get_child_by_name(session, "optional") == NULL;
}

/* Check stream-management support */
Expand Down Expand Up @@ -1183,11 +1188,57 @@ static int _handle_missing_features_sasl(xmpp_conn_t *conn, void *userdata)
return 0;
}

static void _session_start(xmpp_conn_t *conn)
{
xmpp_stanza_t *session;
xmpp_stanza_t *iq = xmpp_iq_new(conn->ctx, "set", "_xmpp_session1");
if (!iq) {
disconnect_mem_error(conn);
return;
}

session = xmpp_stanza_new(conn->ctx);
if (!session) {
xmpp_stanza_release(iq);
disconnect_mem_error(conn);
return;
}

/* setup response handlers */
handler_add_id(conn, _handle_session, "_xmpp_session1", NULL);
handler_add_timed(conn, _handle_missing_session, SESSION_TIMEOUT, NULL);

xmpp_stanza_set_name(session, "session");
xmpp_stanza_set_ns(session, XMPP_NS_SESSION);

xmpp_stanza_add_child_ex(iq, session, 0);

/* send session establishment request */
send_stanza(conn, iq, XMPP_QUEUE_STROPHE);
}

static void _sm_enable(xmpp_conn_t *conn)
{
xmpp_stanza_t *enable = xmpp_stanza_new(conn->ctx);
if (!enable) {
disconnect_mem_error(conn);
return;
}
xmpp_stanza_set_name(enable, "enable");
xmpp_stanza_set_ns(enable, XMPP_NS_SM);
if (!conn->sm_state->dont_request_resume)
xmpp_stanza_set_attribute(enable, "resume", "true");
handler_add(conn, _handle_sm, XMPP_NS_SM, NULL, NULL, NULL);
send_stanza(conn, enable, XMPP_QUEUE_SM_STROPHE);
conn->sm_state->sm_sent_nr = 0;
conn->sm_state->sm_enabled = 1;
}

static int
_handle_bind(xmpp_conn_t *conn, xmpp_stanza_t *stanza, void *userdata)
{
const char *type;
xmpp_stanza_t *iq, *session, *binding, *jid_stanza, *enable = NULL;
xmpp_stanza_t *binding, *jid_stanza;

UNUSED(userdata);

Expand All @@ -1210,58 +1261,19 @@ _handle_bind(xmpp_conn_t *conn, xmpp_stanza_t *stanza, void *userdata)
}
}

/* send enable directly after the bind request */
if (conn->sm_state->sm_support && !conn->sm_disable) {
enable = xmpp_stanza_new(conn->ctx);
if (!enable) {
disconnect_mem_error(conn);
return 0;
}
xmpp_stanza_set_name(enable, "enable");
xmpp_stanza_set_ns(enable, XMPP_NS_SM);
if (!conn->sm_state->dont_request_resume)
xmpp_stanza_set_attribute(enable, "resume", "true");
handler_add(conn, _handle_sm, XMPP_NS_SM, NULL, NULL, NULL);
send_stanza(conn, enable, XMPP_QUEUE_SM_STROPHE);
conn->sm_state->sm_sent_nr = 0;
conn->sm_state->sm_enabled = 1;
}

/* establish a session if required */
if (conn->session_required) {
/* setup response handlers */
handler_add_id(conn, _handle_session, "_xmpp_session1", NULL);
handler_add_timed(conn, _handle_missing_session, SESSION_TIMEOUT,
NULL);

/* send session request */
iq = xmpp_iq_new(conn->ctx, "set", "_xmpp_session1");
if (!iq) {
disconnect_mem_error(conn);
return 0;
}

session = xmpp_stanza_new(conn->ctx);
if (!session) {
xmpp_stanza_release(iq);
disconnect_mem_error(conn);
return 0;
}

xmpp_stanza_set_name(session, "session");
xmpp_stanza_set_ns(session, XMPP_NS_SESSION);

xmpp_stanza_add_child_ex(iq, session, 0);

/* send session establishment request */
send_stanza(conn, iq, XMPP_QUEUE_STROPHE);
_session_start(conn);
}
/* send enable directly after the bind request */
else if (conn->sm_state->sm_support && !conn->sm_disable) {
_sm_enable(conn);
}

/* if there's no xmpp session required and we didn't try to enable
* stream-management, we're done here and the stream-negotiation was
* successful
*/
if (!conn->session_required && !enable) {
else {
_stream_negotiation_success(conn);
}
} else {
Expand Down Expand Up @@ -1298,8 +1310,11 @@ _handle_session(xmpp_conn_t *conn, xmpp_stanza_t *stanza, void *userdata)
xmpp_disconnect(conn);
} else if (type && strcmp(type, "result") == 0) {
strophe_debug(conn->ctx, "xmpp", "Session establishment successful.");

_stream_negotiation_success(conn);
if (conn->sm_state->sm_support && !conn->sm_disable) {
_sm_enable(conn);
} else {
_stream_negotiation_success(conn);
}
} else {
strophe_error(conn->ctx, "xmpp",
"Server sent malformed session reply.");
Expand Down

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