GSocketClient in GNOME GLib through 2.62.4 may occasionally connect directly to a target address instead of connecting via a proxy server when configured to do so, because the proxy_addr field is mishandled. This bug is timing-dependent and may occur only sporadically depending on network delays. The greatest security relevance is in use cases where a proxy is used to help with privacy/anonymity, even though there is no technical barrier to a direct connection.
Signed-off-by: Haiqing Bai <haiqing....@windriver.com> --- .../glib-2.0/glib-2.0/CVE-2020-6750.patch | 741 ++++++++++++++++++ meta/recipes-core/glib-2.0/glib-2.0_2.60.7.bb | 1 + 2 files changed, 742 insertions(+) create mode 100644 meta/recipes-core/glib-2.0/glib-2.0/CVE-2020-6750.patch diff --git a/meta/recipes-core/glib-2.0/glib-2.0/CVE-2020-6750.patch b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2020-6750.patch new file mode 100644 index 0000000000..6db3934978 --- /dev/null +++ b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2020-6750.patch @@ -0,0 +1,741 @@ +From 747f2c646f5a86ac58ad59be08036e81388e971d Mon Sep 17 00:00:00 2001 +From: Patrick Griffis <tingp...@tingping.se> +Date: Thu, 23 Jan 2020 19:58:41 -0800 +Subject: [PATCH] Refactor g_socket_client_connect_async() + +This is a fairly large refactoring. The highlights are: + +- Removing in-progress connections/addresses from GSocketClientAsyncConnectData: + + This caused issues where multiple ConnectionAttempt's would step over eachother + and modify shared state causing bugs like accidentally bypassing a set proxy. + + Fixes #1871 + Fixes #1989 + Fixes #1902 + +- Cancelling address enumeration on error/completion + +- Queuing successful TCP connections and doing application layer work serially: + + This is more in the spirit of Happy Eyeballs but it also greatly simplifies + the flow of connection handling so fewer tasks are happening in parallel + when they don't need to be. + + The behavior also should more closely match that of g_socket_client_connect(). + +- Better track the state of address enumeration: + + Previously we were over eager to treat enumeration finishing as an error. + + Fixes #1872 + See also #1982 + +- Add more detailed documentation and logging. + +Closes #1995 + +CVE: CVE-2020-6750 + +Upstream-Status: Backport [ https://gitlab.gnome.org/GNOME/glib.git; +commit=2722620e3291b930a3a228100d7c0e07b69534e3 ] + +Signed-off-by: Haiqing Bai <haiqing....@windriver.com> +--- + gio/gsocketclient.c | 459 ++++++++++++++++++++++++++++---------------- + 1 file changed, 296 insertions(+), 163 deletions(-) + +diff --git a/gio/gsocketclient.c b/gio/gsocketclient.c +index 81767c0..b1d5f6c 100644 +--- a/gio/gsocketclient.c ++++ b/gio/gsocketclient.c +@@ -1332,13 +1332,15 @@ typedef struct + + GSocketConnectable *connectable; + GSocketAddressEnumerator *enumerator; +- GProxyAddress *proxy_addr; +- GSocket *socket; +- GIOStream *connection; ++ GCancellable *enumeration_cancellable; + + GSList *connection_attempts; ++ GSList *successful_connections; + GError *last_error; + ++ gboolean enumerated_at_least_once; ++ gboolean enumeration_completed; ++ gboolean connection_in_progress; + gboolean completed; + } GSocketClientAsyncConnectData; + +@@ -1350,10 +1352,9 @@ g_socket_client_async_connect_data_free (GSocketClientAsyncConnectData *data) + data->task = NULL; + g_clear_object (&data->connectable); + g_clear_object (&data->enumerator); +- g_clear_object (&data->proxy_addr); +- g_clear_object (&data->socket); +- g_clear_object (&data->connection); ++ g_clear_object (&data->enumeration_cancellable); + g_slist_free_full (data->connection_attempts, connection_attempt_unref); ++ g_slist_free_full (data->successful_connections, connection_attempt_unref); + + g_clear_error (&data->last_error); + +@@ -1365,6 +1366,7 @@ typedef struct + GSocketAddress *address; + GSocket *socket; + GIOStream *connection; ++ GProxyAddress *proxy_addr; + GSocketClientAsyncConnectData *data; /* unowned */ + GSource *timeout_source; + GCancellable *cancellable; +@@ -1396,6 +1398,7 @@ connection_attempt_unref (gpointer pointer) + g_clear_object (&attempt->socket); + g_clear_object (&attempt->connection); + g_clear_object (&attempt->cancellable); ++ g_clear_object (&attempt->proxy_addr); + if (attempt->timeout_source) + { + g_source_destroy (attempt->timeout_source); +@@ -1413,37 +1416,59 @@ connection_attempt_remove (ConnectionAttempt *attempt) + } + + static void +-g_socket_client_async_connect_complete (GSocketClientAsyncConnectData *data) ++cancel_all_attempts (GSocketClientAsyncConnectData *data) + { +- g_assert (data->connection); ++ GSList *l; + +- if (!G_IS_SOCKET_CONNECTION (data->connection)) ++ for (l = data->connection_attempts; l; l = g_slist_next (l)) + { +- GSocketConnection *wrapper_connection; +- +- wrapper_connection = g_tcp_wrapper_connection_new (data->connection, data->socket); +- g_object_unref (data->connection); +- data->connection = (GIOStream *)wrapper_connection; ++ ConnectionAttempt *attempt_entry = l->data; ++ g_cancellable_cancel (attempt_entry->cancellable); ++ connection_attempt_unref (attempt_entry); + } ++ g_slist_free (data->connection_attempts); ++ data->connection_attempts = NULL; + +- if (!data->completed) ++ g_slist_free_full (data->successful_connections, connection_attempt_unref); ++ data->successful_connections = NULL; ++ ++ g_cancellable_cancel (data->enumeration_cancellable); ++} ++ ++static void ++g_socket_client_async_connect_complete (ConnectionAttempt *attempt) ++{ ++ GSocketClientAsyncConnectData *data = attempt->data; ++ GError *error = NULL; ++ g_assert (attempt->connection); ++ g_assert (!data->completed); ++ ++ if (!G_IS_SOCKET_CONNECTION (attempt->connection)) + { +- GError *error = NULL; ++ GSocketConnection *wrapper_connection; + +- if (g_cancellable_set_error_if_cancelled (g_task_get_cancellable (data->task), &error)) +- { +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, NULL); +- g_task_return_error (data->task, g_steal_pointer (&error)); +- } +- else +- { +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, data->connection); +- g_task_return_pointer (data->task, g_steal_pointer (&data->connection), g_object_unref); +- } ++ wrapper_connection = g_tcp_wrapper_connection_new (attempt->connection, attempt->socket); ++ g_object_unref (attempt->connection); ++ attempt->connection = (GIOStream *)wrapper_connection; ++ } + +- data->completed = TRUE; ++ data->completed = TRUE; ++ cancel_all_attempts (data); ++ ++ if (g_cancellable_set_error_if_cancelled (g_task_get_cancellable (data->task), &error)) ++ { ++ g_debug ("GSocketClient: Connection cancelled!"); ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, NULL); ++ g_task_return_error (data->task, g_steal_pointer (&error)); ++ } ++ else ++ { ++ g_debug ("GSocketClient: Connection successful!"); ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, attempt->connection); ++ g_task_return_pointer (data->task, g_steal_pointer (&attempt->connection), g_object_unref); + } + ++ connection_attempt_unref (attempt); + g_object_unref (data->task); + } + +@@ -1465,59 +1490,63 @@ static void + enumerator_next_async (GSocketClientAsyncConnectData *data, + gboolean add_task_ref) + { +- /* We need to cleanup the state */ +- g_clear_object (&data->socket); +- g_clear_object (&data->proxy_addr); +- g_clear_object (&data->connection); +- + /* Each enumeration takes a ref. This arg just avoids repeated unrefs when + an enumeration starts another enumeration */ + if (add_task_ref) + g_object_ref (data->task); + + g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_RESOLVING, data->connectable, NULL); ++ g_debug ("GSocketClient: Starting new address enumeration"); + g_socket_address_enumerator_next_async (data->enumerator, +- g_task_get_cancellable (data->task), ++ data->enumeration_cancellable, + g_socket_client_enumerator_callback, + data); + } + ++static void try_next_connection_or_finish (GSocketClientAsyncConnectData *, gboolean); ++ + static void + g_socket_client_tls_handshake_callback (GObject *object, + GAsyncResult *result, + gpointer user_data) + { +- GSocketClientAsyncConnectData *data = user_data; ++ ConnectionAttempt *attempt = user_data; ++ GSocketClientAsyncConnectData *data = attempt->data; + + if (g_tls_connection_handshake_finish (G_TLS_CONNECTION (object), + result, + &data->last_error)) + { +- g_object_unref (data->connection); +- data->connection = G_IO_STREAM (object); ++ g_object_unref (attempt->connection); ++ attempt->connection = G_IO_STREAM (object); + +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_TLS_HANDSHAKED, data->connectable, data->connection); +- g_socket_client_async_connect_complete (data); ++ g_debug ("GSocketClient: TLS handshake succeeded"); ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_TLS_HANDSHAKED, data->connectable, attempt->connection); ++ g_socket_client_async_connect_complete (attempt); + } + else + { + g_object_unref (object); +- enumerator_next_async (data, FALSE); ++ connection_attempt_unref (attempt); ++ g_debug ("GSocketClient: TLS handshake failed: %s", data->last_error->message); ++ try_next_connection_or_finish (data, TRUE); + } + } + + static void +-g_socket_client_tls_handshake (GSocketClientAsyncConnectData *data) ++g_socket_client_tls_handshake (ConnectionAttempt *attempt) + { ++ GSocketClientAsyncConnectData *data = attempt->data; + GIOStream *tlsconn; + + if (!data->client->priv->tls) + { +- g_socket_client_async_connect_complete (data); ++ g_socket_client_async_connect_complete (attempt); + return; + } + +- tlsconn = g_tls_client_connection_new (data->connection, ++ g_debug ("GSocketClient: Starting TLS handshake"); ++ tlsconn = g_tls_client_connection_new (attempt->connection, + data->connectable, + &data->last_error); + if (tlsconn) +@@ -1529,11 +1558,12 @@ g_socket_client_tls_handshake (GSocketClientAsyncConnectData *data) + G_PRIORITY_DEFAULT, + g_task_get_cancellable (data->task), + g_socket_client_tls_handshake_callback, +- data); ++ attempt); + } + else + { +- enumerator_next_async (data, FALSE); ++ connection_attempt_unref (attempt); ++ try_next_connection_or_finish (data, TRUE); + } + } + +@@ -1542,23 +1572,38 @@ g_socket_client_proxy_connect_callback (GObject *object, + GAsyncResult *result, + gpointer user_data) + { +- GSocketClientAsyncConnectData *data = user_data; ++ ConnectionAttempt *attempt = user_data; ++ GSocketClientAsyncConnectData *data = attempt->data; + +- g_object_unref (data->connection); +- data->connection = g_proxy_connect_finish (G_PROXY (object), +- result, +- &data->last_error); +- if (data->connection) ++ g_object_unref (attempt->connection); ++ attempt->connection = g_proxy_connect_finish (G_PROXY (object), ++ result, ++ &data->last_error); ++ if (attempt->connection) + { +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_PROXY_NEGOTIATED, data->connectable, data->connection); ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_PROXY_NEGOTIATED, data->connectable, attempt->connection); + } + else + { +- enumerator_next_async (data, FALSE); ++ connection_attempt_unref (attempt); ++ try_next_connection_or_finish (data, TRUE); + return; + } + +- g_socket_client_tls_handshake (data); ++ g_socket_client_tls_handshake (attempt); ++} ++ ++static void ++complete_connection_with_error (GSocketClientAsyncConnectData *data, ++ GError *error) ++{ ++ g_debug ("GSocketClient: Connection failed: %s", error->message); ++ g_assert (!data->completed); ++ ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, NULL); ++ data->completed = TRUE; ++ cancel_all_attempts (data); ++ g_task_return_error (data->task, error); + } + + static gboolean +@@ -1572,15 +1617,114 @@ task_completed_or_cancelled (GSocketClientAsyncConnectData *data) + return TRUE; + else if (g_cancellable_set_error_if_cancelled (cancellable, &error)) + { +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, NULL); +- g_task_return_error (task, g_steal_pointer (&error)); +- data->completed = TRUE; ++ complete_connection_with_error (data, g_steal_pointer (&error)); + return TRUE; + } + else + return FALSE; + } + ++static gboolean ++try_next_successful_connection (GSocketClientAsyncConnectData *data) ++{ ++ ConnectionAttempt *attempt; ++ const gchar *protocol; ++ GProxy *proxy; ++ ++ if (data->connection_in_progress) ++ return FALSE; ++ ++ g_assert (data->successful_connections != NULL); ++ attempt = data->successful_connections->data; ++ g_assert (attempt != NULL); ++ data->successful_connections = g_slist_remove (data->successful_connections, attempt); ++ data->connection_in_progress = TRUE; ++ ++ g_debug ("GSocketClient: Starting application layer connection"); ++ ++ if (!attempt->proxy_addr) ++ { ++ g_socket_client_tls_handshake (g_steal_pointer (&attempt)); ++ return TRUE; ++ } ++ ++ protocol = g_proxy_address_get_protocol (attempt->proxy_addr); ++ ++ /* The connection should not be anything other than TCP, ++ * but let's put a safety guard in case ++ */ ++ if (!G_IS_TCP_CONNECTION (attempt->connection)) ++ { ++ g_critical ("Trying to proxy over non-TCP connection, this is " ++ "most likely a bug in GLib IO library."); ++ ++ g_set_error_literal (&data->last_error, ++ G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, ++ _("Proxying over a non-TCP connection is not supported.")); ++ } ++ else if (g_hash_table_contains (data->client->priv->app_proxies, protocol)) ++ { ++ /* Simply complete the connection, we don't want to do TLS handshake ++ * as the application proxy handling may need proxy handshake first */ ++ g_socket_client_async_connect_complete (g_steal_pointer (&attempt)); ++ return TRUE; ++ } ++ else if ((proxy = g_proxy_get_default_for_protocol (protocol))) ++ { ++ GIOStream *connection = attempt->connection; ++ GProxyAddress *proxy_addr = attempt->proxy_addr; ++ ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_PROXY_NEGOTIATING, data->connectable, attempt->connection); ++ g_debug ("GSocketClient: Starting proxy connection"); ++ g_proxy_connect_async (proxy, ++ connection, ++ proxy_addr, ++ g_task_get_cancellable (data->task), ++ g_socket_client_proxy_connect_callback, ++ g_steal_pointer (&attempt)); ++ g_object_unref (proxy); ++ return TRUE; ++ } ++ else ++ { ++ g_clear_error (&data->last_error); ++ ++ g_set_error (&data->last_error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, ++ _("Proxy protocol “%s” is not supported."), ++ protocol); ++ } ++ ++ data->connection_in_progress = FALSE; ++ g_clear_pointer (&attempt, connection_attempt_unref); ++ return FALSE; /* All non-return paths are failures */ ++} ++ ++static void ++try_next_connection_or_finish (GSocketClientAsyncConnectData *data, ++ gboolean end_current_connection) ++{ ++ if (end_current_connection) ++ data->connection_in_progress = FALSE; ++ ++ if (data->connection_in_progress) ++ return; ++ ++ /* Keep trying successful connections until one works, each iteration pops one */ ++ while (data->successful_connections) ++ { ++ if (try_next_successful_connection (data)) ++ return; ++ } ++ ++ if (!data->enumeration_completed) ++ { ++ enumerator_next_async (data, FALSE); ++ return; ++ } ++ ++ complete_connection_with_error (data, data->last_error); ++} ++ + static void + g_socket_client_connected_callback (GObject *source, + GAsyncResult *result, +@@ -1588,10 +1732,7 @@ g_socket_client_connected_callback (GObject *source, + { + ConnectionAttempt *attempt = user_data; + GSocketClientAsyncConnectData *data = attempt->data; +- GSList *l; + GError *error = NULL; +- GProxy *proxy; +- const gchar *protocol; + + if (task_completed_or_cancelled (data) || g_cancellable_is_cancelled (attempt->cancellable)) + { +@@ -1613,11 +1754,12 @@ g_socket_client_connected_callback (GObject *source, + { + clarify_connect_error (error, data->connectable, attempt->address); + set_last_error (data, error); ++ g_debug ("GSocketClient: Connection attempt failed: %s", error->message); + connection_attempt_remove (attempt); +- enumerator_next_async (data, FALSE); + connection_attempt_unref (attempt); ++ try_next_connection_or_finish (data, FALSE); + } +- else ++ else /* Silently ignore cancelled attempts */ + { + g_clear_error (&error); + g_object_unref (data->task); +@@ -1627,74 +1769,21 @@ g_socket_client_connected_callback (GObject *source, + return; + } + +- data->socket = g_steal_pointer (&attempt->socket); +- data->connection = g_steal_pointer (&attempt->connection); +- +- for (l = data->connection_attempts; l; l = g_slist_next (l)) +- { +- ConnectionAttempt *attempt_entry = l->data; +- g_cancellable_cancel (attempt_entry->cancellable); +- connection_attempt_unref (attempt_entry); +- } +- g_slist_free (data->connection_attempts); +- data->connection_attempts = NULL; +- connection_attempt_unref (attempt); +- +- g_socket_connection_set_cached_remote_address ((GSocketConnection*)data->connection, NULL); +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_CONNECTED, data->connectable, data->connection); ++ g_socket_connection_set_cached_remote_address ((GSocketConnection*)attempt->connection, NULL); ++ g_debug ("GSocketClient: TCP connection successful"); ++ g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_CONNECTED, data->connectable, attempt->connection); + + /* wrong, but backward compatible */ +- g_socket_set_blocking (data->socket, TRUE); ++ g_socket_set_blocking (attempt->socket, TRUE); + +- if (!data->proxy_addr) +- { +- g_socket_client_tls_handshake (data); +- return; +- } +- +- protocol = g_proxy_address_get_protocol (data->proxy_addr); +- +- /* The connection should not be anything other than TCP, +- * but let's put a safety guard in case ++ /* This ends the parallel "happy eyeballs" portion of connecting. ++ Now that we have a successful tcp connection we will attempt to connect ++ at the TLS/Proxy layer. If those layers fail we will move on to the next ++ connection. + */ +- if (!G_IS_TCP_CONNECTION (data->connection)) +- { +- g_critical ("Trying to proxy over non-TCP connection, this is " +- "most likely a bug in GLib IO library."); +- +- g_set_error_literal (&data->last_error, +- G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, +- _("Proxying over a non-TCP connection is not supported.")); +- +- enumerator_next_async (data, FALSE); +- } +- else if (g_hash_table_contains (data->client->priv->app_proxies, protocol)) +- { +- /* Simply complete the connection, we don't want to do TLS handshake +- * as the application proxy handling may need proxy handshake first */ +- g_socket_client_async_connect_complete (data); +- } +- else if ((proxy = g_proxy_get_default_for_protocol (protocol))) +- { +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_PROXY_NEGOTIATING, data->connectable, data->connection); +- g_proxy_connect_async (proxy, +- data->connection, +- data->proxy_addr, +- g_task_get_cancellable (data->task), +- g_socket_client_proxy_connect_callback, +- data); +- g_object_unref (proxy); +- } +- else +- { +- g_clear_error (&data->last_error); +- +- g_set_error (&data->last_error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, +- _("Proxy protocol “%s” is not supported."), +- protocol); +- +- enumerator_next_async (data, FALSE); +- } ++ connection_attempt_remove (attempt); ++ data->successful_connections = g_slist_append (data->successful_connections, g_steal_pointer (&attempt)); ++ try_next_connection_or_finish (data, FALSE); + } + + static gboolean +@@ -1702,7 +1791,11 @@ on_connection_attempt_timeout (gpointer data) + { + ConnectionAttempt *attempt = data; + +- enumerator_next_async (attempt->data, TRUE); ++ if (!attempt->data->enumeration_completed) ++ { ++ g_debug ("GSocketClient: Timeout reached, trying another enumeration"); ++ enumerator_next_async (attempt->data, TRUE); ++ } + + g_clear_pointer (&attempt->timeout_source, g_source_unref); + return G_SOURCE_REMOVE; +@@ -1712,9 +1805,9 @@ static void + on_connection_cancelled (GCancellable *cancellable, + gpointer data) + { +- GCancellable *attempt_cancellable = data; ++ GCancellable *linked_cancellable = G_CANCELLABLE (data); + +- g_cancellable_cancel (attempt_cancellable); ++ g_cancellable_cancel (linked_cancellable); + } + + static void +@@ -1738,39 +1831,49 @@ g_socket_client_enumerator_callback (GObject *object, + result, &error); + if (address == NULL) + { +- if (data->connection_attempts) ++ if (G_UNLIKELY (data->enumeration_completed)) ++ return; ++ ++ data->enumeration_completed = TRUE; ++ g_debug ("GSocketClient: Address enumeration completed (out of addresses)"); ++ ++ /* As per API docs: We only care about error if its the first call, ++ after that the enumerator is done. ++ ++ Note that we don't care about cancellation errors because ++ task_completed_or_cancelled() above should handle that. ++ ++ If this fails and nothing is in progress then we will complete task here. ++ */ ++ if ((data->enumerated_at_least_once && !data->connection_attempts && !data->connection_in_progress) || ++ !data->enumerated_at_least_once) + { +- g_object_unref (data->task); +- return; ++ g_debug ("GSocketClient: Address enumeration failed: %s", error ? error->message : NULL); ++ if (data->last_error) ++ { ++ g_clear_error (&error); ++ error = data->last_error; ++ data->last_error = NULL; ++ } ++ else if (!error) ++ { ++ g_set_error_literal (&error, G_IO_ERROR, G_IO_ERROR_FAILED, ++ _("Unknown error on connect")); ++ } ++ ++ complete_connection_with_error (data, error); + } + +- g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_COMPLETE, data->connectable, NULL); +- data->completed = TRUE; +- if (!error) +- { +- if (data->last_error) +- { +- error = data->last_error; +- data->last_error = NULL; +- } +- else +- { +- g_set_error_literal (&error, G_IO_ERROR, G_IO_ERROR_FAILED, +- _("Unknown error on connect")); +- } +- } +- g_task_return_error (data->task, error); ++ /* Enumeration should never trigger again, drop our ref */ + g_object_unref (data->task); + return; + } + ++ data->enumerated_at_least_once = TRUE; ++ g_debug ("GSocketClient: Address enumeration succeeded"); + g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_RESOLVED, + data->connectable, NULL); + +- if (G_IS_PROXY_ADDRESS (address) && +- data->client->priv->enable_proxy) +- data->proxy_addr = g_object_ref (G_PROXY_ADDRESS (address)); +- + g_clear_error (&data->last_error); + + socket = create_socket (data->client, address, &data->last_error); +@@ -1788,6 +1891,10 @@ g_socket_client_enumerator_callback (GObject *object, + attempt->cancellable = g_cancellable_new (); + attempt->connection = (GIOStream *)g_socket_connection_factory_create_connection (socket); + attempt->timeout_source = g_timeout_source_new (HAPPY_EYEBALLS_CONNECTION_ATTEMPT_TIMEOUT_MS); ++ ++ if (G_IS_PROXY_ADDRESS (address) && data->client->priv->enable_proxy) ++ attempt->proxy_addr = g_object_ref (G_PROXY_ADDRESS (address)); ++ + g_source_set_callback (attempt->timeout_source, on_connection_attempt_timeout, attempt, NULL); + g_source_attach (attempt->timeout_source, g_main_context_get_thread_default ()); + data->connection_attempts = g_slist_append (data->connection_attempts, attempt); +@@ -1797,6 +1904,7 @@ g_socket_client_enumerator_callback (GObject *object, + g_object_ref (attempt->cancellable), g_object_unref); + + g_socket_connection_set_cached_remote_address ((GSocketConnection *)attempt->connection, address); ++ g_debug ("GSocketClient: Starting TCP connection attempt"); + g_socket_client_emit_event (data->client, G_SOCKET_CLIENT_CONNECTING, data->connectable, attempt->connection); + g_socket_connection_connect_async (G_SOCKET_CONNECTION (attempt->connection), + address, +@@ -1849,24 +1957,48 @@ g_socket_client_connect_async (GSocketClient *client, + else + data->enumerator = g_socket_connectable_enumerate (connectable); + +- /* The flow and ownership here isn't quite obvious: +- - The task starts an async attempt to connect. +- - Each attempt holds a single ref on task. +- - Each attempt may create new attempts by timing out (not a failure) so +- there are multiple attempts happening in parallel. +- - Upon failure an attempt will start a new attempt that steals its ref +- until there are no more attempts left and it drops its ref. +- - Upon success it will cancel all other attempts and continue on +- to the rest of the connection (tls, proxies, etc) which do not +- happen in parallel and at the very end drop its ref. +- - Upon cancellation an attempt drops its ref. +- */ ++ /* This function tries to match the behavior of g_socket_client_connect () ++ which is simple enough but much of it is done in parallel to be as responsive ++ as possible as per Happy Eyeballs (RFC 8305). This complicates flow quite a ++ bit but we can describe it in 3 sections: ++ ++ Firstly we have address enumeration (DNS): ++ - This may be triggered multiple times by enumerator_next_async(). ++ - It also has its own cancellable (data->enumeration_cancellable). ++ - Enumeration is done lazily because GNetworkAddressAddressEnumerator ++ also does work in parallel and may lazily add new addresses. ++ - If the first enumeration errors then the task errors. Otherwise all enumerations ++ will potentially be used (until task or enumeration is cancelled). ++ ++ Then we start attempting connections (TCP): ++ - Each connection is independent and kept in a ConnectionAttempt object. ++ - They each hold a ref on the main task and have their own cancellable. ++ - Multiple attempts may happen in parallel as per Happy Eyeballs. ++ - Upon failure or timeouts more connection attempts are made. ++ - If no connections succeed the task errors. ++ - Upon success they are kept in a list of successful connections. ++ ++ Lastly we connect at the application layer (TLS, Proxies): ++ - These are done in serial. ++ - The reasoning here is that Happy Eyeballs is about making bad connections responsive ++ at the IP/TCP layers. Issues at the application layer are generally not due to ++ connectivity issues but rather misconfiguration. ++ - Upon failure it will try the next TCP connection until it runs out and ++ the task errors. ++ - Upon success it cancels everything remaining (enumeration and connections) ++ and returns the connection. ++ */ + + data->task = g_task_new (client, cancellable, callback, user_data); + g_task_set_check_cancellable (data->task, FALSE); /* We handle this manually */ + g_task_set_source_tag (data->task, g_socket_client_connect_async); + g_task_set_task_data (data->task, data, (GDestroyNotify)g_socket_client_async_connect_data_free); + ++ data->enumeration_cancellable = g_cancellable_new (); ++ if (cancellable) ++ g_cancellable_connect (cancellable, G_CALLBACK (on_connection_cancelled), ++ g_object_ref (data->enumeration_cancellable), g_object_unref); ++ + enumerator_next_async (data, FALSE); + } + +@@ -1985,6 +2117,7 @@ g_socket_client_connect_to_uri_async (GSocketClient *client, + } + else + { ++ g_debug("g_socket_client_connect_to_uri_async"); + g_socket_client_connect_async (client, + connectable, cancellable, + callback, user_data); +-- +2.23.0 + diff --git a/meta/recipes-core/glib-2.0/glib-2.0_2.60.7.bb b/meta/recipes-core/glib-2.0/glib-2.0_2.60.7.bb index 5aefa6ad8b..5be81a8f31 100644 --- a/meta/recipes-core/glib-2.0/glib-2.0_2.60.7.bb +++ b/meta/recipes-core/glib-2.0/glib-2.0_2.60.7.bb @@ -16,6 +16,7 @@ SRC_URI = "${GNOME_MIRROR}/glib/${SHRT_VER}/glib-${PV}.tar.xz \ file://0001-Do-not-write-bindir-into-pkg-config-files.patch \ file://0001-meson.build-do-not-hardcode-linux-as-the-host-system.patch \ file://0001-meson-do-a-build-time-check-for-strlcpy-before-attem.patch \ + file://CVE-2020-6750.patch \ " SRC_URI_append_class-native = " file://relocate-modules.patch" -- 2.23.0
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