Merge branch 'develop' of github.com:onionshare/onionshare into upgrade-flask

cli/onionshare_cli/censorship.py

@@ -19,8 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
 import requests
 
-from .meek import MeekNotRunning
-
 
 class CensorshipCircumventionError(Exception):
     """
@@ -47,15 +45,12 @@ class CensorshipCircumvention(object):
         self.api_proxies = {}
         if meek:
             self.meek = meek
-            if not self.meek.meek_proxies:
-                raise MeekNotRunning()
-            else:
-                self.common.log(
-                    "CensorshipCircumvention",
-                    "__init__",
-                    "Using Meek with CensorshipCircumvention API",
-                )
-                self.api_proxies = self.meek.meek_proxies
+            self.common.log(
+                "CensorshipCircumvention",
+                "__init__",
+                "Using Meek with CensorshipCircumvention API",
+            )
+            self.api_proxies = self.meek.meek_proxies
         if onion:
             self.onion = onion
             if not self.onion.is_authenticated:
@@ -100,7 +95,7 @@ class CensorshipCircumvention(object):
             if r.status_code != 200:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_map",
+                    "request_map",
                     f"status_code={r.status_code}",
                 )
                 return False
@@ -110,7 +105,7 @@ class CensorshipCircumvention(object):
             if "errors" in result:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_map",
+                    "request_map",
                     f"errors={result['errors']}",
                 )
                 return False
@@ -138,7 +133,7 @@ class CensorshipCircumvention(object):
         if country:
             self.common.log(
                 "CensorshipCircumvention",
-                "censorship_obtain_settings",
+                "request_settings",
                 f"Trying to obtain bridges for country={country}",
             )
             data = {"country": country}
@@ -154,7 +149,7 @@ class CensorshipCircumvention(object):
             if r.status_code != 200:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_settings",
+                    "request_settings",
                     f"status_code={r.status_code}",
                 )
                 return False
@@ -164,7 +159,7 @@ class CensorshipCircumvention(object):
             if "errors" in result:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_settings",
+                    "request_settings",
                     f"errors={result['errors']}",
                 )
                 return False
@@ -175,7 +170,7 @@ class CensorshipCircumvention(object):
             if not "settings" in result:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_settings",
+                    "request_settings",
                     "No settings found for this country",
                 )
                 return False
@@ -200,7 +195,7 @@ class CensorshipCircumvention(object):
             if r.status_code != 200:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_builtin_bridges",
+                    "request_builtin_bridges",
                     f"status_code={r.status_code}",
                 )
                 return False
@@ -210,7 +205,7 @@ class CensorshipCircumvention(object):
             if "errors" in result:
                 self.common.log(
                     "CensorshipCircumvention",
-                    "censorship_obtain_builtin_bridges",
+                    "request_builtin_bridges",
                     f"errors={result['errors']}",
                 )
                 return False
@@ -237,42 +232,15 @@ class CensorshipCircumvention(object):
             f"Obtained bridges: {bridges}",
         )
         bridge_strings = bridges["bridge_strings"]
-        bridge_type = bridges["type"]
-        bridge_source = bridges["source"]
 
-        # If the recommended bridge source is to use the built-in
-        # bridges, set that in our settings, as if the user had
-        # selected the built-in bridges for a specific PT themselves.
-        #
-        if bridge_source == "builtin":
-            self.common.log(
-                "CensorshipCircumvention",
-                "save_settings",
-                "Will be using built-in bridges",
-            )
-            self.settings.set("bridges_type", "built-in")
-            if bridge_type == "obfs4":
-                self.settings.set("bridges_builtin_pt", "obfs4")
-            if bridge_type == "snowflake":
-                self.settings.set("bridges_builtin_pt", "snowflake")
-            if bridge_type == "meek":
-                self.settings.set("bridges_builtin_pt", "meek-azure")
+        self.settings.set("bridges_type", "custom")
+
+        # Sanity check the bridges provided from the Tor API before saving
+        bridges_checked = self.common.check_bridges_valid(bridge_strings)
+
+        if bridges_checked:
+            self.settings.set("bridges_custom", "\n".join(bridges_checked))
             bridges_ok = True
-        else:
-            self.common.log(
-                "CensorshipCircumvention",
-                "save_settings",
-                "Will be using custom bridges",
-            )
-            # Any other type of bridge we can treat as custom.
-            self.settings.set("bridges_type", "custom")
-
-            # Sanity check the bridges provided from the Tor API before saving
-            bridges_checked = self.common.check_bridges_valid(bridge_strings)
-
-            if bridges_checked:
-                self.settings.set("bridges_custom", "\n".join(bridges_checked))
-                bridges_ok = True
 
         # If we got any good bridges, save them to settings and return.
         if bridges_ok:
@@ -291,3 +259,42 @@ class CensorshipCircumvention(object):
                 "Could not use any of the obtained bridges.",
             )
             return False
+
+
+    def request_default_bridges(self):
+        """
+        Retrieves the list of default fall-back bridges from the Tor Project.
+
+        These are intended for when no censorship settings were found for a
+        specific country, but maybe there was some connection issue anyway.
+        """
+        if not self.api_proxies:
+            return False
+        endpoint = "https://bridges.torproject.org/moat/circumvention/defaults"
+        try:
+            r = requests.get(
+                endpoint,
+                headers={"Content-Type": "application/vnd.api+json"},
+                proxies=self.api_proxies,
+            )
+            if r.status_code != 200:
+                self.common.log(
+                    "CensorshipCircumvention",
+                    "request_default_bridges",
+                    f"status_code={r.status_code}",
+                )
+                return False
+
+            result = r.json()
+
+            if "errors" in result:
+                self.common.log(
+                    "CensorshipCircumvention",
+                    "request_default_bridges",
+                    f"errors={result['errors']}",
+                )
+                return False
+
+            return result
+        except requests.exceptions.RequestException as e:
+            raise CensorshipCircumventionError(e)

cli/onionshare_cli/meek.py

@@ -69,7 +69,7 @@ class Meek(object):
         if self.meek_client_file_path is None or not os.path.exists(
             self.meek_client_file_path
         ):
-            raise MeekNotFound()
+            raise MeekNotFound(self.common)
 
         # Start the Meek Client as a subprocess.
         self.common.log("Meek", "start", "Starting meek client")
@@ -128,7 +128,7 @@ class Meek(object):
 
             if "CMETHOD-ERROR" in line:
                 self.cleanup()
-                raise MeekNotRunning()
+                raise MeekNotRunning(self.common, line)
                 break
 
         if self.meek_port:
@@ -137,9 +137,8 @@ class Meek(object):
                 "https": f"socks5h://{self.meek_host}:{self.meek_port}",
             }
         else:
-            self.common.log("Meek", "start", "Could not obtain the meek port")
             self.cleanup()
-            raise MeekNotRunning()
+            raise MeekNotRunning(self.common, "Could not obtain the meek port")
 
     def cleanup(self):
         """
@@ -182,8 +181,19 @@ class MeekNotRunning(Exception):
     number it started on, in order to do domain fronting.
     """
 
+    def __init__(self, common, info=None):
+        self.common = common
+        msg = "Meek experienced an error starting up"
+        if info:
+            msg = msg + f": {info}"
+        self.common.log("MeekNotRunning", "__init__", msg)
+
 
 class MeekNotFound(Exception):
     """
     We were unable to find the Meek Client binary.
     """
+
+    def __init__(self, common):
+        self.common = common
+        self.common.log("MeekNotFound", "__init__", "Could not find the meek binary")

desktop/onionshare/connection_tab.py

@@ -181,7 +181,9 @@ class AutoConnectTab(QtWidgets.QWidget):
         self.tor_con.start(self.curr_settings)
 
     def _got_no_bridges(self):
-        # If we got no bridges, try connecting again using built-in obfs4 bridges
+        # If we got no bridges, even after trying the default bridges
+        # provided by the Censorship API, try connecting again using
+        # our built-in obfs4 bridges
         self.curr_settings.set("bridges_type", "built-in")
         self.curr_settings.set("bridges_builtin_pt", "obfs4")
         self.curr_settings.set("bridges_enabled", True)
@@ -244,6 +246,18 @@ class AutoConnectTab(QtWidgets.QWidget):
             bridge_settings = self.censorship_circumvention.request_settings(
                 country=country
             )
+
+            if not bridge_settings:
+                # Fall back to trying the default bridges from the API
+                self.common.log(
+                    "AutoConnectTab",
+                    "use_bridge_connect_clicked",
+                    "Falling back to trying default bridges provided by the Censorship Circumvention API",
+                )
+                bridge_settings = (
+                    self.censorship_circumvention.request_default_bridges()
+                )
+
             self.common.gui.meek.cleanup()
 
             if bridge_settings and self.censorship_circumvention.save_settings(

desktop/onionshare/moat_dialog.py

@@ -236,14 +236,10 @@ class MoatThread(QtCore.QThread):
         # Start Meek so that we can do domain fronting
         try:
             self.meek.start()
-        except MeekNotFound:
-            self.common.log("MoatThread", "run", f"Could not find meek-client")
-            self.bridgedb_error.emit()
-            return
-        except MeekNotRunning:
-            self.common.log(
-                "MoatThread", "run", f"Ran meek-client, but there was an error"
-            )
+        except (
+            MeekNotFound,
+            MeekNotRunning,
+        ):
             self.bridgedb_error.emit()
             return