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2359 | ------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2006-2018, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Characters.Handling;
with Ada.Containers.Hashed_Maps;
with Ada.Containers.Indefinite_Hashed_Maps;
with Ada.Containers.Ordered_Maps;
with Ada.Directories;
with Ada.Strings.Hash;
with Ada.Strings.Hash_Case_Insensitive;
with Ada.Strings.Equal_Case_Insensitive;
with Ada.Strings.Maps.Constants;
with Ada.Text_IO;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
with Interfaces.C.Strings;
with System.Memory;
with AWS.Config;
with AWS.Net.Log;
with AWS.Net.SSL.Certificate.Impl;
with AWS.Net.SSL.RSA_DH_Generators;
with AWS.OS_Lib;
with AWS.Resources;
with AWS.Translator;
with AWS.Utils;
package body AWS.Net.SSL is
use Interfaces;
use Ada.Strings;
use Ada.Strings.Maps;
use type C.int;
use type C.unsigned;
package CS renames C.Strings;
subtype NSST is Net.Std.Socket_Type;
subtype Datum_Type is Certificate.Impl.Datum_Type;
function Load_File (Filename : String) return Datum_Type
renames Certificate.Impl.Load_File;
type PCert_Array is
array (Positive range <>) of aliased TSSL.gnutls_pcert_st
with Convention => C;
DH_Params : array (0 .. 1) of aliased TSSL.gnutls_dh_params_t
with Atomic_Components;
RSA_Params : array (0 .. 1) of aliased TSSL.gnutls_rsa_params_t
with Atomic_Components;
-- 0 element for current use, 1 element for remain usage after creation new
-- 0 element.
IP_Address_Characters : constant Character_Set :=
To_Set (".:") or Constants.Decimal_Digit_Set;
function Copy (Item : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t;
-- Creates gnutls_datum_t copy
function Image (Item : TSSL.gnutls_datum_t) return String;
function Lib_Alloc (Size : System.Memory.size_t) return System.Address
with Convention => C;
-- Set allocated data to zero to workaroung GNUTLS bug in
-- gnutls_pcert_list_import_x509_raw when it parse file without
-- certificate. Should be fixed in 3.3.1, 3.2.12, 3.1.22 GNUTLS versions.
function Lib_Realloc
(Ptr : System.Address;
Size : System.Memory.size_t) return System.Address
with Convention => C;
-- C library could use null pointer as input parameter for realloc, but
-- gnatmem does not care about it and logging Free of the null pointer
-- and than claiming for "Releasing deallocated memory".
procedure Lib_Free (Ptr : System.Address) with Convention => C;
-- C library could put null pointer as input parameter for free, but
-- gnatmem does not care about it and logging Free of the null pointer
-- and than claiming for "Releasing deallocated memory".
type PCert_Array_Access is access all PCert_Array;
procedure Free (Datum : in out Datum_Type) with Inline;
procedure Check_Error_Code (Code : C.int);
procedure Check_Error_Code (Code : C.int; Socket : Socket_Type'Class);
procedure Code_Processing
(Code : C.int; Socket : Socket_Type'Class; Timeout : Duration);
procedure Code_Processing (Code : C.int; Socket : Socket_Type'Class);
procedure Check_Config (Socket : in out Socket_Type) with Inline;
procedure Do_Handshake_Internal (Socket : Socket_Type) with Inline;
-- The real handshake is done here
function To_Config is new Unchecked_Conversion (System.Address, Config);
function Write_Socket
(S : C.int; Msg : System.Address; Len : C.int) return C.int
with Convention => C;
-- Would be used only on defined MSG_NOSIGNAL platforms to avoid SIGPIPE
-- signal.
function DB_Store
(p1 : System.Address;
key : TSSL.gnutls_datum_t;
data : TSSL.gnutls_datum_t) return C.int with Convention => C;
function DB_Remove
(p1 : System.Address; key : TSSL.gnutls_datum_t) return C.int
with Convention => C;
function DB_Retrieve
(p1 : System.Address;
key : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t
with Convention => C;
procedure Debug_Output_Default (Text : String);
procedure SSL_Log (level : C.int; text : CS.chars_ptr)
with Convention => C;
procedure SSL_Log_Audit
(sessn : TSSL.gnutls_session_t; level : C.int; text : CS.chars_ptr)
with Convention => C;
procedure SSL_Log_Common
(Prefix : String; Level : C.int; text : CS.chars_ptr);
function Equal (Left, Right : TSSL.gnutls_datum_t) return Boolean;
function Hash (Item : TSSL.gnutls_datum_t) return Containers.Hash_Type;
procedure Check_File (Prefix, Filename : String);
-- Check that Filename is present, raise an exception adding
-- Prefix in front of the message.
type Session_Element is record
Datum : TSSL.gnutls_datum_t;
Birth : Calendar.Time;
end record;
package Session_Container is
new Containers.Hashed_Maps
(Key_Type => TSSL.gnutls_datum_t,
Element_Type => Session_Element,
Hash => Hash,
Equivalent_Keys => Equal);
package Time_Set is
new Containers.Ordered_Maps
(Key_Type => Calendar.Time,
Element_Type => TSSL.gnutls_datum_t,
"<" => Calendar."<",
"=" => Equal);
protected type Session_Cache is
procedure Set_Size (Size : Natural);
-- Set the maximum cache size
function Get_Size return Natural;
-- Get the maximum cache size
function Length return Natural;
-- Returns number of sessions currently in cache
procedure Put (Key, Data : TSSL.gnutls_datum_t);
function Get (Key : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t;
procedure Drop (Key : TSSL.gnutls_datum_t);
procedure Clear;
private
Size : Natural := Natural'Last;
Map : Session_Container.Map;
DTI : Time_Set.Map; -- To remove oldest sessions to fit Size
end Session_Cache;
type Certificate_Holder is record
PCerts : PCert_Array_Access;
TLS_PK : aliased TSSL.gnutls_privkey_t;
end record;
package Host_Certificates is new Ada.Containers.Indefinite_Hashed_Maps
(String, Certificate_Holder, Hash => Hash_Case_Insensitive,
Equivalent_Keys => Equal_Case_Insensitive);
type TS_SSL is record
CC : aliased TSSL.gnutls_certificate_credentials_t;
PCert_Lists : Host_Certificates.Map;
Priority_Cache : aliased TSSL.gnutls_priority_t;
Ticket_Support : Boolean;
Ticket_Key : aliased TSSL.gnutls_datum_t := (System.Null_Address, 0);
Sessions : Session_Cache;
RCC : Boolean := False; -- Request client certificate
CREQ : Boolean := False; -- Certificate is required
Verify_CB : Net.SSL.Certificate.Verify_Callback;
CRL_File : C.Strings.chars_ptr := C.Strings.Null_Ptr;
CRL_Semaphore : Utils.Semaphore;
CRL_Time_Stamp : Calendar.Time := Utils.AWS_Epoch;
end record;
procedure Initialize
(Config : in out TS_SSL;
Certificate_Filename : String;
Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Key_Filename : String;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural);
procedure Add_Host_Certificate
(Config : in out TS_SSL;
Host : String;
Certificate_Filename : String;
Key_Filename : String);
procedure Session_Client (Socket : in out Socket_Type; Host : String);
procedure Session_Server (Socket : in out Socket_Type);
-- Bind the SSL socket handle with the socket
procedure Session_Transport (Socket : in out Socket_Type);
function Verify_Callback (Session : TSSL.gnutls_session_t) return C.int
with Convention => C;
procedure Finalize (Config : in out TS_SSL);
Default_Config : aliased TS_SSL;
protected Default_Config_Sync is
procedure Create;
-- Create default config with default parameters
procedure Initialize
(Certificate_Filename : String;
Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Key_Filename : String;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural);
private
Done : Boolean := False;
end Default_Config_Sync;
procedure Initialize_Default_Config;
-- Initializes default config. It could be called more then once, because
-- secondary initialization is ignored.
procedure Secure
(Source : Net.Socket_Type'Class;
Target : out Socket_Type;
Config : SSL.Config);
-- Make Target a secure socket for Source using the given configuration
function Retrieve_Certificate
(Session : TSSL.gnutls_session_t;
req_ca_rdn : access constant TSSL.gnutls_datum_t;
nreqs : C.int;
pk_algos : access constant TSSL.gnutls_pk_algorithm_t;
pk_algos_length : C.int;
pcert : access TSSL.a_gnutls_pcert_st;
pcert_length : access C.unsigned;
privkey : access TSSL.gnutls_privkey_t) return C.int
with Convention => C;
function Params_Callback
(Sessn : TSSL.gnutls_session_t;
Kind : TSSL.gnutls_params_type_t;
Params : access TSSL.gnutls_params_st) return C.int
with Convention => C;
-- Callback to give Diffie-Hellman and/or RSA parameters
-------------------------
-- Abort_DH_Generation --
-------------------------
procedure Abort_DH_Generation is
begin
Abort_DH_Flag := True;
end Abort_DH_Generation;
-------------------
-- Accept_Socket --
-------------------
overriding procedure Accept_Socket
(Socket : Net.Socket_Type'Class; New_Socket : in out Socket_Type) is
begin
loop
Net.Std.Accept_Socket (Socket, NSST (New_Socket));
Session_Server (New_Socket);
begin
Do_Handshake (New_Socket);
exit;
exception
when Socket_Error =>
New_Socket.Shutdown;
end;
end loop;
end Accept_Socket;
--------------------------
-- Add_Host_Certificate --
--------------------------
procedure Add_Host_Certificate
(Config : SSL.Config;
Host : String;
Certificate_Filename : String;
Key_Filename : String := "") is
begin
Add_Host_Certificate
(Config.all, Host, Certificate_Filename, Key_Filename);
end Add_Host_Certificate;
procedure Add_Host_Certificate
(Config : in out TS_SSL;
Host : String;
Certificate_Filename : String;
Key_Filename : String)
is
Cert : aliased Datum_Type;
Key : aliased Datum_Type;
TLS_PK : aliased TSSL.gnutls_privkey_t;
Password : constant String :=
Net.SSL.Certificate.Get_Password
(if Key_Filename = "" then Certificate_Filename else Key_Filename);
Pwd : CS.chars_ptr :=
(if Password = "" then CS.Null_Ptr else CS.New_String (Password));
function Load_PCert_List (Try_Size : Positive) return PCert_Array;
procedure Final;
Drop : Utils.Finalizer (Final'Access) with Unreferenced;
-----------
-- Final --
-----------
procedure Final is
begin
CS.Free (Pwd);
Free (Cert);
if Key_Filename /= "" then
Free (Key);
end if;
end Final;
---------------------
-- Load_PCert_List --
---------------------
function Load_PCert_List (Try_Size : Positive) return PCert_Array is
Result : PCert_Array (1 .. Try_Size);
Size : aliased C.unsigned := C.unsigned (Try_Size);
RC : constant C.int :=
TSSL.gnutls_pcert_list_import_x509_raw
(Result (1)'Access,
Size'Access,
Cert.Datum'Unchecked_Access,
TSSL.GNUTLS_X509_FMT_PEM,
TSSL.GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
begin
if RC = TSSL.GNUTLS_E_SHORT_MEMORY_BUFFER then
return Load_PCert_List (Positive (Size));
else
Check_Error_Code (RC);
end if;
return Result (1 .. Positive (Size));
end Load_PCert_List;
begin
Check_File ("Certificate", Certificate_Filename);
Cert := Load_File (Certificate_Filename);
if Key_Filename = "" then
Key := Cert;
else
Check_File ("Key", Key_Filename);
Key := Load_File (Key_Filename);
end if;
Check_Error_Code (TSSL.gnutls_privkey_init (TLS_PK'Access));
Check_Error_Code
(TSSL.gnutls_privkey_import_x509_raw
(TLS_PK, Key.Datum'Unchecked_Access, TSSL.GNUTLS_X509_FMT_PEM, Pwd,
0));
Config.PCert_Lists.Insert
(Host, (new PCert_Array'(Load_PCert_List (4)), TLS_PK));
end Add_Host_Certificate;
------------------
-- Check_Config --
------------------
procedure Check_Config (Socket : in out Socket_Type) is
begin
if Socket.Config = null then
Initialize_Default_Config;
Socket.Config := Default_Config'Access;
end if;
end Check_Config;
----------------------
-- Check_Error_Code --
----------------------
procedure Check_Error_Code (Code : C.int; Socket : Socket_Type'Class) is
begin
if Code /= 0 then
Raise_Socket_Error
(Socket, C.Strings.Value (TSSL.gnutls_strerror (Code)));
end if;
end Check_Error_Code;
procedure Check_Error_Code (Code : C.int) is
begin
if Code /= 0 then
Raise_Socket_Error
(Socket_Type'(Std.Socket_Type with others => <>),
C.Strings.Value (TSSL.gnutls_strerror (Code)));
end if;
end Check_Error_Code;
----------------
-- Check_File --
----------------
procedure Check_File (Prefix, Filename : String) is
use type Directories.File_Kind;
begin
if Directories.Kind (Filename) /= Directories.Ordinary_File then
raise Socket_Error
with Prefix & " file """ & Filename & """ error.";
end if;
end Check_File;
------------------------
-- Cipher_Description --
------------------------
overriding function Cipher_Description (Socket : Socket_Type) return String
is
use TSSL;
begin
return CS.Value (gnutls_cipher_get_name (gnutls_cipher_get (Socket.SSL)))
& ' ' & CS.Value
(gnutls_protocol_get_name
(gnutls_protocol_get_version (Socket.SSL)))
& ' ' & CS.Value (gnutls_kx_get_name (gnutls_kx_get (Socket.SSL)))
& ' ' & CS.Value (gnutls_mac_get_name (gnutls_mac_get (Socket.SSL)));
end Cipher_Description;
-------------
-- Ciphers --
-------------
procedure Ciphers (Cipher : not null access procedure (Name : String)) is
use type CS.chars_ptr;
Name : CS.chars_ptr;
cs_id : array (0 .. 1) of aliased C.unsigned_char;
kx : aliased TSSL.gnutls_kx_algorithm_t;
ciph : aliased TSSL.gnutls_cipher_algorithm_t;
mac : aliased TSSL.gnutls_mac_algorithm_t;
min_ver : aliased TSSL.gnutls_protocol_t;
begin
for J in 0 .. C.size_t'Last loop
Name := TSSL.gnutls_cipher_suite_info
(J, cs_id (0)'Access, kx'Access, ciph'Access, mac'Access,
min_ver'Access);
exit when Name = CS.Null_Ptr;
Cipher (Utils.Hex (C.unsigned_char'Pos (cs_id (0)), 2)
& ' ' & Utils.Hex (C.unsigned_char'Pos (cs_id (1)), 2)
& ' ' & CS.Value (TSSL.gnutls_protocol_get_name (min_ver))
& ' ' & CS.Value (TSSL.gnutls_kx_get_name (kx))
& ' ' & CS.Value (TSSL.gnutls_cipher_get_name (ciph))
& ' ' & CS.Value (TSSL.gnutls_mac_get_name (mac)));
end loop;
end Ciphers;
-------------------------
-- Clear_Session_Cache --
-------------------------
procedure Clear_Session_Cache (Config : SSL.Config := Null_Config) is
begin
if Config = Null_Config then
Default_Config.Sessions.Clear;
else
Config.Sessions.Clear;
end if;
end Clear_Session_Cache;
---------------------
-- Code_Processing --
---------------------
procedure Code_Processing
(Code : C.int; Socket : Socket_Type'Class; Timeout : Duration) is
begin
case Code is
when TSSL.GNUTLS_E_INTERRUPTED | TSSL.GNUTLS_E_AGAIN =>
case TSSL.gnutls_record_get_direction (Socket.SSL) is
when 0 => Wait_For (Input, Socket, Timeout);
when 1 => Wait_For (Output, Socket, Timeout);
when others =>
Log_Error ("Unexpected gnutls_record_get_direction result");
raise Program_Error;
end case;
when others =>
Check_Error_Code (Code, Socket);
end case;
end Code_Processing;
procedure Code_Processing (Code : C.int; Socket : Socket_Type'Class) is
begin
Code_Processing (Code, Socket, Net.Socket_Type (Socket).Timeout);
end Code_Processing;
-------------
-- Connect --
-------------
overriding procedure Connect
(Socket : in out Socket_Type;
Host : String;
Port : Positive;
Wait : Boolean := True;
Family : Family_Type := Family_Unspec) is
begin
Net.Std.Connect (NSST (Socket), Host, Port, Wait, Family);
Session_Client (Socket, Host);
if Wait then
Do_Handshake (Socket);
end if;
end Connect;
----------
-- Copy --
----------
function Copy (Item : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t is
Result : TSSL.gnutls_datum_t;
type Array_Access is access
all Stream_Element_Array (1 .. Stream_Element_Offset (Item.size));
function To_Array is
new Unchecked_Conversion (TSSL.a_unsigned_char_t, Array_Access);
begin
if Item.size = 0 then
return Item;
end if;
Result.data := TSSL.gnutls_malloc (C.size_t (Item.size));
Result.size := Item.size;
To_Array (Result.data).all := To_Array (Item.data).all;
return Result;
end Copy;
---------------
-- DB_Remove --
---------------
function DB_Remove
(p1 : System.Address; key : TSSL.gnutls_datum_t) return C.int
is
Cfg : constant Config := To_Config (p1);
begin
if Debug_Output /= null then
Debug_Output ("Remove session " & Image (key) & ASCII.LF);
end if;
Cfg.Sessions.Drop (key);
return 0;
exception
when E : others =>
Log_Error (Exception_Information (E));
return 1;
end DB_Remove;
-----------------
-- DB_Retrieve --
-----------------
function DB_Retrieve
(p1 : System.Address;
key : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t
is
Cfg : constant Config := To_Config (p1);
begin
if Debug_Output /= null then
Debug_Output ("Retrieve session " & Image (key) & ASCII.LF);
end if;
return Copy (Cfg.Sessions.Get (key));
exception
when E : others =>
Log_Error (Exception_Information (E));
return (System.Null_Address, 0);
end DB_Retrieve;
--------------
-- DB_Store --
--------------
function DB_Store
(p1 : System.Address;
key : TSSL.gnutls_datum_t;
data : TSSL.gnutls_datum_t) return C.int
is
Cfg : constant Config := To_Config (p1);
begin
if Debug_Output /= null then
Debug_Output ("Store session " & Image (key) & ASCII.LF);
end if;
Cfg.Sessions.Put (key, data);
return 0;
exception
when E : others =>
Log_Error (Exception_Information (E));
return 1;
end DB_Store;
--------------------------
-- Debug_Output_Default --
--------------------------
procedure Debug_Output_Default (Text : String) is
begin
Text_IO.Put (Text_IO.Current_Error, Text);
end Debug_Output_Default;
-------------------------
-- Default_Config_Sync --
-------------------------
protected body Default_Config_Sync is
------------
-- Create --
------------
procedure Create is
package CNF renames AWS.Config;
Default : CNF.Object renames CNF.Default_Config;
begin
if not Done then
Initialize
(Config => Default_Config,
Certificate_Filename => CNF.Certificate (Default),
Security_Mode => Method'Value
(CNF.Security_Mode (Default)),
Priorities => CNF.Cipher_Priorities (Default),
Ticket_Support => CNF.TLS_Ticket_Support (Default),
Key_Filename => CNF.Key (Default),
Exchange_Certificate => CNF.Exchange_Certificate (Default),
Certificate_Required => CNF.Certificate_Required (Default),
Trusted_CA_Filename => CNF.Trusted_CA (Default),
CRL_Filename => CNF.CRL_File (Default),
Session_Cache_Size => 16#4000#);
Done := True;
end if;
end Create;
----------------
-- Initialize --
----------------
procedure Initialize
(Certificate_Filename : String;
Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Key_Filename : String;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural) is
begin
if not Done then
Initialize
(Default_Config,
Certificate_Filename, Security_Mode, Priorities,
Ticket_Support, Key_Filename, Exchange_Certificate,
Certificate_Required, Trusted_CA_Filename, CRL_Filename,
Session_Cache_Size);
Done := True;
end if;
end Initialize;
end Default_Config_Sync;
------------------
-- Do_Handshake --
------------------
procedure Do_Handshake (Socket : in out Socket_Type) is
begin
Do_Handshake_Internal (Socket);
end Do_Handshake;
---------------------------
-- Do_Handshake_Internal --
---------------------------
procedure Do_Handshake_Internal (Socket : Socket_Type) is
Code : C.int;
begin
if Socket.IO.Handshaken.all then
return;
end if;
loop
Code := TSSL.gnutls_handshake (Socket.SSL);
exit when Code = TSSL.GNUTLS_E_SUCCESS;
if Debug_Output /= null and then Socket.Get_FD /= No_Socket then
Debug_Output
("Handshake" & Socket.Get_Port'Img & Socket.Peer_Port'Img
& Socket.Get_FD'Img & Code'Img & ASCII.LF);
end if;
Code_Processing (Code, Socket);
end loop;
Socket.IO.Handshaken.all := True;
end Do_Handshake_Internal;
-----------
-- Equal --
-----------
function Equal (Left, Right : TSSL.gnutls_datum_t) return Boolean is
type Array_Access is
access all Stream_Element_Array (1 .. Stream_Element_Offset'Last);
function To_Array is
new Unchecked_Conversion (TSSL.a_unsigned_char_t, Array_Access);
begin
return Left.size = Right.size
and then
To_Array (Left.data) (1 .. Stream_Element_Offset (Left.size))
= To_Array (Right.data) (1 .. Stream_Element_Offset (Right.size));
end Equal;
--------------
-- Finalize --
--------------
procedure Finalize (Config : in out TS_SSL) is
use type TSSL.gnutls_certificate_credentials_t;
use type TSSL.gnutls_priority_t;
procedure Unchecked_Free is
new Unchecked_Deallocation (PCert_Array, PCert_Array_Access);
begin
if Config.CC /= null then
TSSL.gnutls_certificate_free_credentials (Config.CC);
Config.CC := null;
end if;
for Cert of Config.PCert_Lists loop
for C of Cert.PCerts.all loop
TSSL.gnutls_pcert_deinit (C);
end loop;
Unchecked_Free (Cert.PCerts);
TSSL.gnutls_privkey_deinit (Cert.TLS_PK);
end loop;
if Config.Priority_Cache /= null then
TSSL.gnutls_priority_deinit (Config.Priority_Cache);
Config.Priority_Cache := null;
end if;
TSSL.gnutls_free (Config.Ticket_Key.data);
Config.Ticket_Key.data := System.Null_Address;
Config.Sessions.Clear;
end Finalize;
----------
-- Free --
----------
overriding procedure Free (Socket : in out Socket_Type) is
use type TSSL.gnutls_session_t;
procedure Unchecked_Free is new
Unchecked_Deallocation (Boolean, TSSL.Boolean_Access);
begin
if Socket.SSL /= null then
TSSL.gnutls_deinit (Socket.SSL);
Socket.SSL := null;
end if;
Unchecked_Free (Socket.IO.Handshaken);
Net.Std.Free (NSST (Socket));
end Free;
procedure Free (Datum : in out Datum_Type) is
begin
Utils.Unchecked_Free (Datum.Data);
end Free;
procedure Free (Session : in out Session_Type) is
procedure Unchecked_Free is
new Unchecked_Deallocation (TSSL.Session_Record, Session_Type);
begin
if Session = null then
return;
end if;
TSSL.gnutls_free (Session.Data.data);
Unchecked_Free (Session);
end Free;
procedure Free (Key : in out Private_Key) is
begin
if Key /= null then
TSSL.gnutls_privkey_deinit (TSSL.Private_Key (Key));
Key := null;
end if;
end Free;
-----------------
-- Generate_DH --
-----------------
procedure Generate_DH is
use type TSSL.gnutls_dh_params_t;
New_One : aliased TSSL.gnutls_dh_params_t;
OK : Boolean;
Bits : C.unsigned;
function Loaded return Boolean;
procedure Save;
------------
-- Loaded --
------------
function Loaded return Boolean is
Filename : constant String :=
RSA_DH_Generators.Parameters_Filename
("dh-" & Utils.Image (Integer (Bits)), Exist => True);
Datum : Datum_Type;
begin
if Filename = "" then
return False;
end if;
Datum := Load_File (Filename);
Check_Error_Code
(TSSL.gnutls_dh_params_import_pkcs3
(New_One, Datum.Datum'Unchecked_Access,
TSSL.GNUTLS_X509_FMT_PEM));
Free (Datum);
DH_Time (DH_Time_Idx + 1) := Resources.File_Timestamp (Filename);
DH_Time_Idx := DH_Time_Idx + 1;
return True;
end Loaded;
----------
-- Save --
----------
procedure Save is
Filename : constant String :=
RSA_DH_Generators.Parameters_Filename
("dh-" & Utils.Image (Integer (Bits)), Exist => False);
Data : String (1 .. 4096);
Last : aliased C.size_t := Data'Length;
File : Text_IO.File_Type;
begin
if Filename = "" then
return;
end if;
Check_Error_Code
(TSSL.gnutls_dh_params_export_pkcs3
(New_One, TSSL.GNUTLS_X509_FMT_PEM, Data'Address,
Last'Unchecked_Access));
Text_IO.Create
(File, Text_IO.Out_File, Filename, Form => "shared=no");
Text_IO.Put (File, Data (1 .. Natural (Last)));
Text_IO.Close (File);
end Save;
begin
DH_Lock.Try_Lock (OK);
if not OK then
-- Already in concurrent generation
return;
end if;
Check_Error_Code (TSSL.gnutls_dh_params_init (New_One'Access));
Bits := TSSL.gnutls_sec_param_to_pk_bits
(TSSL.GNUTLS_PK_DH, TSSL.GNUTLS_SEC_PARAM_NORMAL);
if DH_Params (0) /= null or else not Loaded then
Check_Error_Code (TSSL.gnutls_dh_params_generate2 (New_One, Bits));
DH_Time (DH_Time_Idx + 1) := Calendar.Clock;
DH_Time_Idx := DH_Time_Idx + 1;
Save;
end if;
TSSL.gnutls_dh_params_deinit (DH_Params (1));
DH_Params (1) := DH_Params (0);
DH_Params (0) := New_One;
DH_Lock.Unlock;
end Generate_DH;
------------------
-- Generate_RSA --
------------------
procedure Generate_RSA is
New_One : aliased TSSL.gnutls_rsa_params_t;
OK : Boolean;
begin
RSA_Lock.Try_Lock (OK);
if not OK then
-- Already in concurrent generation
return;
end if;
Check_Error_Code (TSSL.gnutls_x509_privkey_init (New_One'Access));
Check_Error_Code
(TSSL.gnutls_x509_privkey_generate
(New_One, TSSL.GNUTLS_PK_RSA,
TSSL.gnutls_sec_param_to_pk_bits
(TSSL.GNUTLS_PK_RSA, TSSL.GNUTLS_SEC_PARAM_NORMAL), 0));
TSSL.gnutls_x509_privkey_deinit (RSA_Params (1));
RSA_Params (1) := RSA_Params (0);
RSA_Params (0) := New_One;
RSA_Time (RSA_Time_Idx + 1) := Calendar.Clock;
RSA_Time_Idx := RSA_Time_Idx + 1;
RSA_Lock.Unlock;
end Generate_RSA;
----------
-- Hash --
----------
function Hash
(Item : TSSL.gnutls_datum_t) return Containers.Hash_Type
is
type String_Access is access all String (Positive);
function To_Access is
new Unchecked_Conversion (TSSL.a_unsigned_char_t, String_Access);
begin
return Strings.Hash
(To_Access (Item.data) (1 .. Natural (Item.size)));
end Hash;
-----------
-- Image --
-----------
function Image (Item : TSSL.gnutls_datum_t) return String is
type String_Access is access all String (1 .. Natural (Item.size));
function To_Access is
new Unchecked_Conversion (TSSL.a_unsigned_char_t, String_Access);
Src : constant String_Access := To_Access (Item.data);
Result : String (1 .. Natural (Item.size) * 2);
begin
if System."=" (Item.data, System.Null_Address) then
return "";
end if;
for J in 1 .. Natural (Item.size) loop
Result (J * 2 - 1 .. J * 2) :=
Ada.Characters.Handling.To_Lower
(Utils.Hex (Character'Pos (Src (J)), 2));
end loop;
return Result;
end Image;
----------------
-- Initialize --
----------------
procedure Initialize
(Config : in out SSL.Config;
Certificate_Filename : String;
Security_Mode : Method := TLS;
Priorities : String := "";
Ticket_Support : Boolean := False;
Key_Filename : String := "";
Exchange_Certificate : Boolean := False;
Certificate_Required : Boolean := False;
Trusted_CA_Filename : String := "";
CRL_Filename : String := "";
Session_Cache_Size : Natural := 16#4000#) is
begin
if Config = null then
Config := new TS_SSL;
end if;
Initialize
(Config.all,
Certificate_Filename => Certificate_Filename,
Security_Mode => Security_Mode,
Priorities => Priorities,
Ticket_Support => Ticket_Support,
Key_Filename => Key_Filename,
Exchange_Certificate => Exchange_Certificate,
Certificate_Required => Certificate_Required,
Trusted_CA_Filename => Trusted_CA_Filename,
CRL_Filename => CRL_Filename,
Session_Cache_Size => Session_Cache_Size);
end Initialize;
procedure Initialize
(Config : in out TS_SSL;
Certificate_Filename : String;
Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Key_Filename : String;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural)
is
procedure Set_Certificate;
-- Set credentials from Cetificate_Filename and Key_Filename
function Get_Priorities return String;
-- Returns the Priorities string from Initialize of a default one
-- depending on the Security_Mode.
--------------------
-- Get_Priorities --
--------------------
function Get_Priorities return String is
begin
if Priorities /= "" then
return Priorities;
else
case Security_Mode is
when TLS | TLS_Server | TLS_Client =>
return "NORMAL";
when TLSv1 | TLSv1_Server | TLSv1_Client =>
return "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.0";
when TLSv1_1 | TLSv1_1_Server | TLSv1_1_Client =>
return "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.1";
when TLSv1_2 | TLSv1_2_Server | TLSv1_2_Client =>
return "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2";
end case;
end if;
end Get_Priorities;
---------------------
-- Set_Certificate --
---------------------
procedure Set_Certificate is
procedure Final;
Trust_CA : aliased Datum_Type;
Drop : Utils.Finalizer (Final'Access) with Unreferenced;
-----------
-- Final --
-----------
procedure Final is
begin
Free (Trust_CA);
end Final;
begin
Add_Host_Certificate (Config, "", Certificate_Filename, Key_Filename);
TSSL.gnutls_certificate_set_retrieve_function2
(Config.CC, Retrieve_Certificate'Access);
if Trusted_CA_Filename /= "" then
Check_File ("CA", Trusted_CA_Filename);
Trust_CA := Load_File (Trusted_CA_Filename);
if TSSL.gnutls_certificate_set_x509_trust_mem
(Config.CC, Trust_CA.Datum'Unchecked_Access,
TSSL.GNUTLS_X509_FMT_PEM) = -1
then
raise Socket_Error
with "cannot set CA file " & Trusted_CA_Filename;
end if;
end if;
end Set_Certificate;
begin -- Initialize
Config.Sessions.Set_Size (Session_Cache_Size);
Config.Ticket_Support := Ticket_Support;
Check_Error_Code
(TSSL.gnutls_certificate_allocate_credentials (Config.CC'Access));
-- Looks like it is possible to use gnutls_certificate_credentials_t
-- on client side without certificate assigned. See
-- "Simple client example with X.509 certificate support" example
-- at http://www.gnutls.org/manual/html_node
-- Commented code
-- /* If client holds a certificate it can be set using the following:
-- *
-- gnutls_certificate_set_x509_key_file (xcred,
-- "cert.pem", "key.pem",
-- GNUTLS_X509_FMT_PEM);
-- */
if Certificate_Filename /= "" then
Set_Certificate;
end if;
if Security_Mode = SSLv23
or else Security_Mode = TLSv1
or else Security_Mode = TLSv1_1
or else Security_Mode = TLSv1_2
or else Security_Mode = SSLv3
or else Security_Mode = SSLv23_Server
or else Security_Mode = TLSv1_Server
or else Security_Mode = TLSv1_1_Server
or else Security_Mode = TLSv1_2_Server
or else Security_Mode = SSLv3_Server
then
Config.RCC := Exchange_Certificate;
Config.CREQ := Certificate_Required;
if Ticket_Support then
Check_Error_Code
(TSSL.gnutls_session_ticket_key_generate
(Config.Ticket_Key'Access));
end if;
TSSL.gnutls_certificate_set_params_function
(Config.CC, Params_Callback'Access);
end if;
TSSL.gnutls_certificate_set_verify_function
(cred => Config.CC, func => Verify_Callback'Access);
if CRL_Filename /= "" then
Config.CRL_File := C.Strings.New_String (CRL_Filename);
end if;
declare
GP : constant String := Get_Priorities;
Pr : aliased C.char_array := C.To_C (GP);
Pp : CS.chars_ptr;
Er : aliased CS.chars_ptr;
RC : C.int;
begin
if GP /= "" then
Pp := CS.To_Chars_Ptr (Pr'Unchecked_Access);
end if;
RC := TSSL.gnutls_priority_init
(priority_cache => Config.Priority_Cache'Access,
priorities => Pp,
err_pos => Er'Access);
if RC = TSSL.GNUTLS_E_INVALID_REQUEST then
Log_Error ("Priority syntax error '" & CS.Value (Er) & ''');
else
Check_Error_Code (RC);
end if;
end;
end Initialize;
-------------------------------
-- Initialize_Default_Config --
-------------------------------
procedure Initialize_Default_Config
(Certificate_Filename : String;
Security_Mode : Method := TLS;
Priorities : String := "";
Ticket_Support : Boolean := False;
Key_Filename : String := "";
Exchange_Certificate : Boolean := False;
Certificate_Required : Boolean := False;
Trusted_CA_Filename : String := "";
CRL_Filename : String := "";
Session_Cache_Size : Natural := 16#4000#) is
begin
Default_Config_Sync.Initialize
(Certificate_Filename, Security_Mode, Priorities, Ticket_Support,
Key_Filename, Exchange_Certificate, Certificate_Required,
Trusted_CA_Filename, CRL_Filename, Session_Cache_Size);
end Initialize_Default_Config;
procedure Initialize_Default_Config is
begin
Default_Config_Sync.Create;
end Initialize_Default_Config;
---------------
-- Lib_Alloc --
---------------
function Lib_Alloc (Size : System.Memory.size_t) return System.Address is
type Binary_Access is
access all Stream_Element_Array (1 .. Stream_Element_Offset (Size));
function To_Access is
new Unchecked_Conversion (System.Address, Binary_Access);
Result : constant System.Address := System.Memory.Alloc (Size);
begin
To_Access (Result).all := (others => 0);
return Result;
end Lib_Alloc;
--------------
-- Lib_Free --
--------------
procedure Lib_Free (Ptr : System.Address) is
use System;
begin
if Ptr /= Null_Address then
Memory.Free (Ptr);
end if;
end Lib_Free;
-----------------
-- Lib_Realloc --
-----------------
function Lib_Realloc
(Ptr : System.Address;
Size : System.Memory.size_t) return System.Address
is
use System;
begin
if Ptr = Null_Address then
return Lib_Alloc (Size);
else
return Memory.Realloc (Ptr, Size);
end if;
end Lib_Realloc;
----------
-- Load --
----------
function Load (Filename : String) return Private_Key is
Data : Datum_Type := Load_File (Filename);
Key : aliased TSSL.Private_Key;
begin
Check_Error_Code (TSSL.gnutls_privkey_init (Key'Access));
Check_Error_Code
(TSSL.gnutls_privkey_import_x509_raw
(Key, Data.Datum'Unchecked_Access, TSSL.GNUTLS_X509_FMT_PEM,
CS.Null_Ptr, 0));
Free (Data);
return Private_Key (Key);
end Load;
---------------
-- Log_Error --
---------------
procedure Log_Error (Text : String) is
begin
Log.Error (Socket_Type'(Std.Socket_Type with others => <>), Text);
end Log_Error;
---------------------
-- Params_Callback --
---------------------
function Params_Callback
(Sessn : TSSL.gnutls_session_t;
Kind : TSSL.gnutls_params_type_t;
Params : access TSSL.gnutls_params_st) return C.int
is
pragma Unreferenced (Sessn);
begin
case Kind is
when TSSL.GNUTLS_PARAMS_RSA_EXPORT =>
Params.params.rsa_export := RSA_Params (0);
when TSSL.GNUTLS_PARAMS_DH =>
Params.params.dh := DH_Params (0);
when others =>
return -1;
end case;
Params.kind := Kind;
Params.deinit := 0;
return 0;
end Params_Callback;
-------------
-- Pending --
-------------
overriding function Pending
(Socket : Socket_Type) return Stream_Element_Count is
begin
return Stream_Element_Count
(TSSL.gnutls_record_check_pending (Socket.SSL));
end Pending;
-------------
-- Receive --
-------------
overriding procedure Receive
(Socket : Socket_Type;
Data : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
Code : TSSL.ssize_t;
First : Stream_Element_Offset := Data'First;
begin
Do_Handshake_Internal (Socket);
loop
Code := TSSL.gnutls_record_recv
(Socket.SSL, Data (First)'Address,
C.size_t (Data'Length - First + Data'First));
if Code > 0 then
First := First + Stream_Element_Offset (Code);
Last := First - 1;
exit when Last = Data'Last;
else
exit when First > Data'First and then NSST (Socket).Pending = 0;
if Code = 0 then
raise Socket_Error with Peer_Closed_Message;
end if;
Code_Processing (Code, Socket);
end if;
end loop;
end Receive;
-------------
-- Release --
-------------
procedure Release (Config : in out SSL.Config) is
procedure Unchecked_Free is
new Unchecked_Deallocation (TS_SSL, SSL.Config);
begin
if Config /= null and then Config /= Default_Config'Access then
Finalize (Config.all);
Unchecked_Free (Config);
end if;
end Release;
--------------------------
-- Retrieve_Certificate --
--------------------------
function Retrieve_Certificate
(Session : TSSL.gnutls_session_t;
req_ca_rdn : access constant TSSL.gnutls_datum_t;
nreqs : C.int;
pk_algos : access constant TSSL.gnutls_pk_algorithm_t;
pk_algos_length : C.int;
pcert : access TSSL.a_gnutls_pcert_st;
pcert_length : access C.unsigned;
privkey : access TSSL.gnutls_privkey_t) return C.int
is
pragma Unreferenced (req_ca_rdn, nreqs, pk_algos, pk_algos_length);
use type Ada.Containers.Count_Type;
SN : aliased C.char_array (0 .. 255);
Kind : aliased TSSL.gnutls_server_name_type_t;
Size : aliased C.size_t := SN'Length;
Cfg : constant Config :=
To_Config (TSSL.gnutls_session_get_ptr (Session));
CN : Host_Certificates.Cursor;
CH : Certificate_Holder;
function Get_Server_Name return String;
---------------------
-- Get_Server_Name --
---------------------
function Get_Server_Name return String is
RC : constant C.int := TSSL.gnutls_server_name_get
(Session, SN'Address, Size'Unchecked_Access,
Kind'Access, 0);
begin
case RC is
when TSSL.GNUTLS_E_SHORT_MEMORY_BUFFER =>
Log_Error ("Requested server name too long " & C.To_Ada (SN)
& Size'Img);
return "";
when TSSL.GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE =>
return "";
when TSSL.GNUTLS_E_SUCCESS =>
return C.To_Ada (SN);
when others =>
raise Socket_Error with
"gnutls_server_name_get error code " & RC'Img;
end case;
end Get_Server_Name;
begin
if Cfg.PCert_Lists.Length = 1 then
-- Server does not expect different SNI requests
CN := Cfg.PCert_Lists.First;
else
declare
Server_Name : constant String := Get_Server_Name;
begin
CN := Cfg.PCert_Lists.Find (Server_Name);
if not Host_Certificates.Has_Element (CN) then
Log_Error
("Certifiace for server '" & Server_Name & "' not found");
CN := Cfg.PCert_Lists.Find ("");
end if;
end;
end if;
CH := Host_Certificates.Element (CN);
pcert.all := CH.PCerts (CH.PCerts'First)'Access;
pcert_length.all := CH.PCerts'Length;
privkey.all := CH.TLS_PK;
return 0;
exception
when E : others =>
Log_Error (Exception_Information (E));
return -1;
end Retrieve_Certificate;
------------
-- Secure --
------------
procedure Secure
(Source : Net.Socket_Type'Class;
Target : out Socket_Type;
Config : SSL.Config) is
begin
Std.Socket_Type (Target) := Std.Socket_Type (Source);
Target.Config := Config;
Check_Config (Target);
end Secure;
-------------------
-- Secure_Client --
-------------------
function Secure_Client
(Socket : Net.Socket_Type'Class;
Config : SSL.Config := Null_Config;
Host : String := "") return Socket_Type
is
Result : Socket_Type;
begin
Secure (Socket, Result, Config);
Session_Client (Result, Host);
return Result;
end Secure_Client;
-------------------
-- Secure_Server --
-------------------
function Secure_Server
(Socket : Net.Socket_Type'Class;
Config : SSL.Config := Null_Config) return Socket_Type
is
Result : Socket_Type;
begin
Secure (Socket, Result, Config);
Session_Server (Result);
return Result;
end Secure_Server;
----------
-- Send --
----------
overriding procedure Send
(Socket : Socket_Type;
Data : Stream_Element_Array;
Last : out Stream_Element_Offset)
is
Code : TSSL.ssize_t;
begin
Do_Handshake_Internal (Socket);
if Data'Length = 0 then
Last := Last_Index (Data'First, 0);
return;
end if;
loop
Code :=
TSSL.gnutls_record_send (Socket.SSL, Data'Address, Data'Length);
if Code >= 0 then
Last := Last_Index (Data'First, Natural (Code));
exit;
end if;
case Code is
when TSSL.GNUTLS_E_INTERRUPTED =>
case TSSL.gnutls_record_get_direction (Socket.SSL) is
when 0 =>
if Socket.Pending = 0 then
Last := Last_Index (Data'First, 0);
exit;
end if;
when 1 =>
if not Socket.Check ((Output => True, Input => False))
(Output)
then
Last := Last_Index (Data'First, 0);
exit;
end if;
when others =>
raise Program_Error;
end case;
when TSSL.GNUTLS_E_AGAIN =>
Last := Last_Index (Data'First, 0);
exit;
when others =>
Check_Error_Code (Code, Socket);
end case;
end loop;
end Send;
-------------------
-- Session_Cache --
-------------------
protected body Session_Cache is
-----------
-- Clear --
-----------
procedure Clear is
begin
for J in Map.Iterate loop
TSSL.gnutls_free (Map (J).Datum.data);
end loop;
Map.Clear;
for J in DTI.Iterate loop
TSSL.gnutls_free (DTI (J).data);
end loop;
DTI.Clear;
end Clear;
----------
-- Drop --
----------
procedure Drop (Key : TSSL.gnutls_datum_t) is
Cs : Session_Container.Cursor := Map.Find (Key);
Dd : constant TSSL.a_unsigned_char_t := Map (Cs).Datum.data;
Kd : constant TSSL.a_unsigned_char_t :=
Session_Container.Key (Cs).data;
Dt : constant Calendar.Time := Map (Cs).Birth;
begin
Map.Delete (Cs);
DTI.Delete (Dt);
TSSL.gnutls_free (Kd);
TSSL.gnutls_free (Dd);
end Drop;
---------
-- Get --
---------
function Get (Key : TSSL.gnutls_datum_t) return TSSL.gnutls_datum_t is
Ce : constant Session_Container.Cursor := Map.Find (Key);
begin
if Session_Container.Has_Element (Ce) then
return Map (Key).Datum;
else
return (System.Null_Address, 0);
end if;
end Get;
--------------
-- Get_Size --
--------------
function Get_Size return Natural is
begin
return Size;
end Get_Size;
------------
-- Length --
------------
function Length return Natural is
begin
return Natural (Map.Length);
end Length;
---------
-- Put --
---------
procedure Put (Key, Data : TSSL.gnutls_datum_t) is
use Ada.Calendar;
E : Session_Element;
Ce : Time_Set.Cursor;
Cm : Session_Container.Cursor := Map.Find (Key);
OK : Boolean;
K : TSSL.gnutls_datum_t;
begin
if Session_Container.Has_Element (Cm) then
K := Session_Container.Key (Cm);
E := Map (Cm);
Map.Delete (Cm);
DTI.Delete (E.Birth);
TSSL.gnutls_free (E.Datum.data);
else
K := Copy (Key);
end if;
E := (Copy (Data), Clock);
for J in 1 .. 8 loop
DTI.Insert (E.Birth, K, Ce, OK);
exit when OK;
E.Birth := E.Birth + Duration'Small;
end loop;
if not OK then
raise Program_Error with "Time index entry creation";
end if;
Map.Insert (K, E);
while Natural (Map.Length) > Size loop
Drop (DTI.First_Element);
end loop;
end Put;
--------------
-- Set_Size --
--------------
procedure Set_Size (Size : Natural) is
begin
Session_Cache.Size := Size;
end Set_Size;
end Session_Cache;
--------------------------
-- Session_Cache_Number --
--------------------------
function Session_Cache_Number
(Config : SSL.Config := Null_Config) return Natural
is
Cfg : constant SSL.Config :=
(if Config = Null_Config then Default_Config'Access else Config);
begin
return Cfg.Sessions.Length;
end Session_Cache_Number;
--------------------
-- Session_Client --
--------------------
procedure Session_Client (Socket : in out Socket_Type; Host : String) is
use TSSL;
begin
Check_Config (Socket);
Check_Error_Code
(gnutls_init
(Socket.SSL'Access,
GNUTLS_CLIENT + (if Socket.Config.Ticket_Support then 0
else GNUTLS_NO_EXTENSIONS)),
Socket);
if Socket.Config.Ticket_Support then
Check_Error_Code (gnutls_session_ticket_enable_client (Socket.SSL));
end if;
if Socket.Sessn /= null then
Socket.Set_Session_Data (Socket.Sessn);
Socket.Sessn := null;
end if;
Check_Error_Code
(gnutls_credentials_set (Socket.SSL, cred => Socket.Config.CC),
Socket);
Session_Transport (Socket);
if Host /= "" and then not (To_Set (Host) <= IP_Address_Characters) then
-- GNUTLS does not allow to set physical address text representation
-- as server name.
Check_Error_Code
(TSSL.gnutls_server_name_set
(Socket.SSL, TSSL.GNUTLS_NAME_DNS, Host'Address, Host'Length));
end if;
end Session_Client;
------------------
-- Session_Data --
------------------
function Session_Data (Socket : Socket_Type) return Session_Type is
Result : Session_Type;
Id : aliased Stream_Element_Array (1 .. 64);
Len : aliased C.size_t := Id'Length;
begin
Check_Error_Code
(TSSL.gnutls_session_get_id
(Socket.SSL, Id'Address, Len'Unchecked_Access));
Result := new TSSL.Session_Record (Stream_Element_Count (Len));
Result.Id := Id (1 .. Stream_Element_Count (Len));
Check_Error_Code
(TSSL.gnutls_session_get_data2 (Socket.SSL, Result.Data'Access));
return Result;
end Session_Data;
----------------------
-- Session_Id_Image --
----------------------
function Session_Id_Image (Session : Session_Type) return String is
begin
if Session = null then
return "";
else
return Translator.Base64_Encode (Session.Id);
end if;
end Session_Id_Image;
function Session_Id_Image (Socket : Socket_Type) return String is
Id : aliased Stream_Element_Array (1 .. 64);
Len : aliased C.size_t := Id'Length;
begin
Check_Error_Code
(TSSL.gnutls_session_get_id
(Socket.SSL, Id'Address, Len'Unchecked_Access));
return Translator.Base64_Encode (Id (1 .. Stream_Element_Offset (Len)));
end Session_Id_Image;
--------------------
-- Session_Reused --
--------------------
function Session_Reused (Socket : Socket_Type) return Boolean is
begin
return TSSL.gnutls_session_is_resumed (Socket.SSL) /= 0;
end Session_Reused;
--------------------
-- Session_Server --
--------------------
procedure Session_Server (Socket : in out Socket_Type) is
use TSSL;
use type C.Strings.chars_ptr;
use type System.Address;
begin
Check_Config (Socket);
if DH_Params (0) = null
and then RSA_Params (0) = null
and then not RSA_Lock.Locked and then not DH_Lock.Locked
then
Start_Parameters_Generation (DH => True);
end if;
Check_Error_Code
(gnutls_init
(Socket.SSL'Access,
GNUTLS_SERVER + (if Socket.Config.Ticket_Support then 0
else GNUTLS_NO_EXTENSIONS)),
Socket);
if Socket.Config.Ticket_Support then
Check_Error_Code
(gnutls_session_ticket_enable_server
(Socket.SSL, Socket.Config.Ticket_Key'Access));
end if;
if Socket.Config.Sessions.Get_Size > 0 then
gnutls_db_set_ptr (Socket.SSL, Socket.Config.all'Address);
gnutls_db_set_retrieve_function (Socket.SSL, DB_Retrieve'Access);
gnutls_db_set_remove_function (Socket.SSL, DB_Remove'Access);
gnutls_db_set_store_function (Socket.SSL, DB_Store'Access);
end if;
Check_Error_Code
(gnutls_credentials_set (Socket.SSL, cred => Socket.Config.CC),
Socket);
if Socket.Config.RCC then
gnutls_certificate_server_set_request
(Socket.SSL,
(if Socket.Config.CREQ
then GNUTLS_CERT_REQUIRE else GNUTLS_CERT_REQUEST));
if Socket.Config.CRL_File /= C.Strings.Null_Ptr then
declare
use type Calendar.Time;
TS : constant Calendar.Time :=
Utils.File_Time_Stamp
(C.Strings.Value (Socket.Config.CRL_File));
RC : C.int;
begin
if Socket.Config.CRL_Time_Stamp = Utils.AWS_Epoch
or else Socket.Config.CRL_Time_Stamp /= TS
then
Socket.Config.CRL_Semaphore.Seize;
Socket.Config.CRL_Time_Stamp := TS;
RC := TSSL.gnutls_certificate_set_x509_crl_file
(Socket.Config.CC,
Socket.Config.CRL_File,
TSSL.GNUTLS_X509_FMT_PEM);
Socket.Config.CRL_Semaphore.Release;
if RC = -1 then
raise Socket_Error
with "cannot set CRL file "
& C.Strings.Value (Socket.Config.CRL_File);
end if;
end if;
end;
end if;
else
gnutls_certificate_server_set_request
(Socket.SSL, GNUTLS_CERT_IGNORE);
end if;
Session_Transport (Socket);
end Session_Server;
-----------------------
-- Session_Transport --
-----------------------
procedure Session_Transport (Socket : in out Socket_Type) is
begin
Check_Error_Code
(TSSL.gnutls_priority_set (Socket.SSL, Socket.Config.Priority_Cache),
Socket);
TSSL.gnutls_transport_set_ptr
(Socket.SSL, TSSL.gnutls_transport_ptr_t (Socket.Get_FD));
pragma Warnings (Off, "*condition is always *");
if OS_Lib.MSG_NOSIGNAL /= -1 then
TSSL.gnutls_transport_set_push_function
(Socket.SSL, push_func => Write_Socket'Address);
end if;
pragma Warnings (On, "*condition is always *");
Socket.IO.Handshaken := new Boolean'(False);
-- Record the SSL config to use in Verify_Callback for server and for
-- Retrieve_Certificate for client.
TSSL.gnutls_session_set_ptr (Socket.SSL, Socket.Config.all'Address);
end Session_Transport;
----------------
-- Set_Config --
----------------
procedure Set_Config (Socket : in out Socket_Type; Config : SSL.Config) is
begin
Socket.Config := Config;
end Set_Config;
---------------
-- Set_Debug --
---------------
procedure Set_Debug
(Level : Natural; Output : Debug_Output_Procedure := null) is
begin
Debug_Output :=
(if Output = null and then Level > 0
then Debug_Output_Default'Access
else Output);
TSSL.gnutls_global_set_log_function (SSL_Log'Access);
TSSL.gnutls_global_set_audit_log_function (SSL_Log_Audit'Access);
TSSL.gnutls_global_set_log_level (C.int (Level));
end Set_Debug;
----------------------------
-- Set_Session_Cache_Size --
----------------------------
procedure Set_Session_Cache_Size
(Size : Natural; Config : SSL.Config := Null_Config) is
begin
if Config = Null_Config then
Initialize_Default_Config;
Default_Config.Sessions.Set_Size (Size);
else
Config.Sessions.Set_Size (Size);
end if;
end Set_Session_Cache_Size;
----------------------
-- Set_Session_Data --
----------------------
procedure Set_Session_Data
(Socket : in out Socket_Type; Data : Session_Type)
is
use type TSSL.gnutls_session_t;
begin
if Socket.SSL = null or else Socket.Get_FD = No_Socket then
Socket.Sessn := Data;
else
Check_Error_Code
(TSSL.gnutls_session_set_data
(Socket.SSL, Data.Data.data, C.size_t (Data.Data.size)));
end if;
end Set_Session_Data;
-------------------------
-- Set_Verify_Callback --
-------------------------
procedure Set_Verify_Callback
(Config : in out SSL.Config; Callback : System.Address)
is
function To_Callback is new Unchecked_Conversion
(System.Address, Net.SSL.Certificate.Verify_Callback);
begin
Config.Verify_CB := To_Callback (Callback);
end Set_Verify_Callback;
--------------
-- Shutdown --
--------------
overriding procedure Shutdown
(Socket : Socket_Type; How : Shutmode_Type := Shut_Read_Write)
is
use type TSSL.Boolean_Access;
use type TSSL.gnutls_session_t;
Code : C.int;
To_C : constant array (Shutmode_Type) of TSSL.gnutls_close_request_t :=
(Shut_Read_Write => TSSL.GNUTLS_SHUT_RDWR,
Shut_Read => TSSL.GNUTLS_SHUT_RDWR, -- Absent, use RDWR
Shut_Write => TSSL.GNUTLS_SHUT_WR);
begin
if Socket.IO.Handshaken /= null and then Socket.IO.Handshaken.all then
-- Must be done only after successful handshake
loop
Code := TSSL.gnutls_bye (Socket.SSL, To_C (How));
exit when Code = TSSL.GNUTLS_E_SUCCESS;
begin
Code_Processing
(Code, Socket,
Duration'Min
(Net.Socket_Type (Socket).Timeout, Shutdown_Read_Timeout));
exception
when E : others =>
Net.Log.Error (Socket, Exception_Message (E));
exit;
end;
end loop;
end if;
if Socket.SSL /= null then
TSSL.gnutls_transport_set_ptr (Socket.SSL, 0);
end if;
Net.Std.Shutdown (NSST (Socket), How);
end Shutdown;
---------------
-- Signature --
---------------
function Signature
(Ptr : System.Address;
Size : Interfaces.C.size_t;
Key : Private_Key;
Hash : Hash_Method) return Stream_Element_Array
is
To_C : constant array (Hash_Method) of TSSL.gnutls_mac_algorithm_t
:= (MD5 => TSSL.GNUTLS_MAC_MD5,
SHA1 => TSSL.GNUTLS_MAC_SHA1,
SHA224 => TSSL.GNUTLS_MAC_SHA224,
SHA256 => TSSL.GNUTLS_MAC_SHA256,
SHA384 => TSSL.GNUTLS_MAC_SHA384,
SHA512 => TSSL.GNUTLS_MAC_SHA512);
Dat : aliased TSSL.gnutls_datum_t := (Ptr, C.unsigned (Size));
Sig : aliased TSSL.gnutls_datum_t;
begin
Check_Error_Code
(TSSL.gnutls_privkey_sign_data
(signer => TSSL.Private_Key (Key),
hash => TSSL.gnutls_digest_algorithm_t (To_C (Hash)),
flags => 0,
data => Dat'Unchecked_Access,
signature => Sig'Access));
declare
type Array_Access is access all
Stream_Element_Array (1 .. Stream_Element_Offset (Sig.size));
function To_Result is
new Unchecked_Conversion (TSSL.a_unsigned_char_t, Array_Access);
Result : constant Stream_Element_Array := To_Result (Sig.data).all;
begin
TSSL.gnutls_free (Sig.data);
return Result;
end;
end Signature;
-----------------
-- Socket_Pair --
-----------------
overriding procedure Socket_Pair (S1, S2 : out Socket_Type) is
ST1, ST2 : Std.Socket_Type;
begin
Std.Socket_Pair (ST1, ST2);
S1 := Secure_Server (ST1);
S2 := Secure_Client (ST2);
end Socket_Pair;
-------------
-- SSL_Log --
-------------
procedure SSL_Log (level : C.int; text : CS.chars_ptr) is
begin
SSL_Log_Common ("", level, text);
end SSL_Log;
-------------------
-- SSL_Log_Audit --
-------------------
procedure SSL_Log_Audit
(sessn : TSSL.gnutls_session_t; level : C.int; text : CS.chars_ptr)
is
pragma Unreferenced (sessn);
begin
SSL_Log_Common ("@", level, text);
end SSL_Log_Audit;
--------------------
-- SSL_Log_Common --
--------------------
procedure SSL_Log_Common
(Prefix : String; Level : C.int; text : CS.chars_ptr)
is
Lev : constant String := Level'Img;
Fst : Positive := Lev'First;
Adt : constant String := CS.Value (text);
begin
if Lev (Fst) = ' ' then
Fst := Fst + 1;
end if;
Debug_Output ("|<" & Prefix & Lev (Fst .. Lev'Last) & ">| " & Adt);
end SSL_Log_Common;
---------------------------------
-- Start_Parameters_Generation --
---------------------------------
procedure Start_Parameters_Generation
(DH : Boolean; Logging : access procedure (Text : String) := null) is
begin
RSA_DH_Generators.Start_Parameters_Generation (DH, Logging);
end Start_Parameters_Generation;
---------------------
-- Verify_Callback --
---------------------
function Verify_Callback (Session : TSSL.gnutls_session_t) return C.int is
use type Net.SSL.Certificate.Verify_Callback;
use type TSSL.a_gnutls_datum_t;
type Datum_List is
array (1 .. C.unsigned'Last) of aliased TSSL.gnutls_datum_t
with Convention => C;
type Datum_List_Access is access all Datum_List;
function To_Array_Access is
new Unchecked_Conversion (TSSL.a_gnutls_datum_t, Datum_List_Access);
Status : aliased C.unsigned;
Cfg : Config;
Cert_List : TSSL.a_gnutls_datum_t;
Cert_List_Len : aliased C.unsigned;
Cert : aliased TSSL.gnutls_x509_crt_t;
Error_Code : C.int;
function Is_Error (Code : C.int) return Boolean;
--------------
-- Is_Error --
--------------
function Is_Error (Code : C.int) return Boolean is
begin
if Code < 0 then
Log_Error (C.Strings.Value (TSSL.gnutls_strerror (Code)));
return True;
end if;
return False;
end Is_Error;
begin
-- Get the session config
Cfg := To_Config (TSSL.gnutls_session_get_ptr (Session));
Error_Code := TSSL.gnutls_certificate_verify_peers2
(Session, Status'Access);
if Error_Code = TSSL.GNUTLS_E_NO_CERTIFICATE_FOUND
and then not Cfg.CREQ
then
return 0;
elsif Is_Error (Error_Code) then
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end if;
-- Get the peer certificate
Cert_List := TSSL.gnutls_certificate_get_peers
(Session, Cert_List_Len'Access);
if Cert_List = null then
Log_Error ("gnutls_certificate_get_peers null result");
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end if;
if Cfg.Verify_CB /= null then
for J in reverse 1 .. Cert_List_Len loop
if Is_Error (TSSL.gnutls_x509_crt_init (Cert'Access)) then
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end if;
if Is_Error
(TSSL.gnutls_x509_crt_import
(Cert, To_Array_Access (Cert_List) (J)'Unchecked_Access,
TSSL.GNUTLS_X509_FMT_DER))
then
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end if;
if not Cfg.Verify_CB (Net.SSL.Certificate.Impl.Read (Status, Cert))
and then Status = 0
then
Status := 1;
end if;
TSSL.gnutls_x509_crt_deinit (Cert);
end loop;
end if;
if Status = 0 or else not Cfg.CREQ then
return 0;
else
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end if;
exception
when E : others =>
Log_Error (Exception_Message (E));
return TSSL.GNUTLS_E_CERTIFICATE_ERROR;
end Verify_Callback;
-------------
-- Version --
-------------
function Version (Build_Info : Boolean := False) return String is
use C.Strings;
pragma Unreferenced (Build_Info);
begin
return "GNUTLS " & Value (TSSL.gnutls_check_version (Null_Ptr));
end Version;
------------------
-- Write_Socket --
------------------
function Write_Socket
(S : C.int; Msg : System.Address; Len : C.int) return C.int
is
function C_Send
(S : C.int;
Msg : System.Address;
Len : C.int;
Flags : C.int) return C.int
with Import, Convention => Stdcall, External_Name => "send";
begin
return C_Send (S, Msg, Len, OS_Lib.MSG_NOSIGNAL);
end Write_Socket;
begin
TSSL.gnutls_global_set_mem_functions
(alloc_func => Lib_Alloc'Address,
secure_alloc_func => System.Memory.Alloc'Address,
is_secure_func => null,
realloc_func => Lib_Realloc'Address,
free_func => Lib_Free'Access);
if TSSL.gnutls_global_init /= 0 then
raise Program_Error;
end if;
end AWS.Net.SSL;
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