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2398 | ------------------------------------------------------------------------------
-- Ada Web Server --
-- --
-- Copyright (C) 2000-2018, 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;
-- Routines here are wrappers around standard sockets and SSL.
--
-- IMPORTANT: The default certificate used for the SSL connection is
-- "cert.pem" (in the working directory) if it exists. If this file does
-- not exists it is required to initialize the SSL layer certificate with
-- AWS.Server.Set_Security.
with Ada.Command_Line;
with Ada.Containers.Indefinite_Hashed_Maps;
with Ada.Directories;
with Ada.Strings.Equal_Case_Insensitive;
with Ada.Strings.Hash_Case_Insensitive;
with Ada.Task_Attributes;
with Ada.Task_Identification;
with Ada.Task_Termination;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
with Interfaces.C.Strings;
with System.Memory;
with System.Storage_Elements;
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.Translator;
with AWS.Utils;
package body AWS.Net.SSL is
use Ada.Strings;
use Interfaces;
use type C.int;
use type C.long;
use type TSSL.Pointer;
use type TSSL.SSL_CTX;
use type TSSL.SSL_Handle;
subtype NSST is Net.Std.Socket_Type;
package Locking is
procedure Initialize;
-- Initialize OpenSSL version less 1.1 locking callbacks, this makes
-- OpenSSL implementation thread safe.
end Locking;
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.
function BIO_Debug_Write
(BIO : TSSL.BIO_Access;
Buf : C.Strings.chars_ptr;
Size : C.int) return C.int with Convention => C;
Debug_BIO_Method : TSSL.BIO_Method_Access;
Debug_BIO_Output : TSSL.BIO_Access;
package Host_Certificates is new Ada.Containers.Indefinite_Hashed_Maps
(String, TSSL.SSL_CTX, Hash => Hash_Case_Insensitive,
Equivalent_Keys => Equal_Case_Insensitive);
procedure Set_Session_Cache_Size (Context : TSSL.SSL_CTX; Size : Integer);
-- Check the session cache size for specified context. Check error codes
-- and raise exception on errors.
protected type TS_SSL is
procedure Set_IO (Socket : in out Socket_Type);
-- Bind the SSL handle with the BIO pair
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);
procedure Prepare
(Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural);
procedure Initialize_Host_Certificate
(Host : String;
Certificate_Filename : String;
Key_Filename : String);
procedure Finalize;
procedure Clear_Session_Cache;
procedure Set_Session_Cache_Size (Size : Natural);
function Session_Cache_Number return Natural;
procedure Set_Verify_Callback (Callback : System.Address);
procedure Check_CRL;
-- Check Certificate Revocation List, if this file has changed reload it
private
Default_Context : TSSL.SSL_CTX := TSSL.Null_CTX;
CRL_Filename : C.Strings.chars_ptr := C.Strings.Null_Ptr;
CRL_Time_Stamp : Calendar.Time := Utils.AWS_Epoch;
Hosts : Host_Certificates.Map;
Security_Mode : Method;
Ticket_Support : Boolean;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Session_Cache_Size : Natural;
Priorities : C.Strings.chars_ptr;
Trusted_CA_Filename : C.Strings.chars_ptr;
Trusted_CA_Stack : TSSL.STACK_OF_X509_NAME :=
TSSL.Null_STACK_OF_X509_NAME;
end TS_SSL;
function Server_Name_Callback
(Session : SSL_Handle;
ad : access C.int; -- documentation not found
Hosts : access Host_Certificates.Map) return C.int
with Convention => C;
-- Callback to get server name on server side as client sent
type Memory_Access is access all
Stream_Element_Array (1 .. Stream_Element_Offset'Last);
Default_Config : constant Config := new TS_SSL;
Data_Index : C.int;
-- Application specific data's index
Max_Overhead : Stream_Element_Count range 0 .. 2**15 := 81 with Atomic;
for Max_Overhead'Size use 16;
-- Need size limitation because Stream_Element_Count is 64 bit and could
-- not guarantee Atomic on 32 bit platform.
Debug_Level : Natural := 0 with Atomic;
DH_Params : array (0 .. 1) of aliased TSSL.DH :=
(others => TSSL.Null_Pointer) with Atomic_Components;
RSA_Params : array (0 .. 1) of aliased TSSL.RSA :=
(others => TSSL.Null_Pointer) with Atomic_Components;
-- 0 element for current use, 1 element for remain usage after creation new
-- 0 element.
DH_Length : constant C.int := 2048;
RSA_Length : constant C.int := 2048;
function DH_Generate_cb
(a, b : C.int; cb : access TSSL.BN_GENCB) return C.int
with Convention => C;
DH_Generate_Callback : aliased TSSL.BN_GENCB :=
(cb => DH_Generate_cb'Access, others => <>);
procedure Socket_Read (Socket : Socket_Type);
-- Read encripted data from socket if necessary
procedure Socket_Write (Socket : Socket_Type; Gone : C.int := 0);
-- Write encripted data to socket if availabe
procedure Error_If (Error : Boolean) with Inline;
-- Raises Socket_Error if Error is true. Attach the SSL error message
procedure Error_If (Socket : Socket_Type; Error : Boolean) with Inline;
-- Raises and log Socket_Error if Error is true.
-- Attach the SSL error message.
procedure File_Error (Prefix, Name : String) with No_Return;
-- Prefix is the type of file key or certificate that was expected
procedure Do_Handshake (Socket : in out Socket_Type; Success : out Boolean);
-- Perform SSL handshake
function Error_Stack return String renames Certificate.Impl.Error_Stack;
-- Returns error stack of the last SSL error in multiple lines
function Error_Str (Code : TSSL.Error_Code) return String
renames Certificate.Impl.Error_Str;
-- Returns the SSL error message for error Code
procedure Init_Random;
-- Initialize the SSL library with a random number
procedure Initialize_Default_Config;
-- Initializes default config. It could be called more then once, because
-- secondary initialization is ignored.
function Verify_Callback
(preverify_ok : C.int; ctx : TSSL.X509_STORE_CTX) return C.int
with Convention => C;
-- This routine is needed to be able to retreive the client's certificate
-- and validate it thought the user's verification routine if provided.
function Tmp_RSA_Callback
(SSL : SSL_Handle; Is_Export : C.int; Keylength : C.int) return TSSL.RSA
with Convention => C;
function Tmp_DH_Callback
(SSL : SSL_Handle; Is_Export : C.int; Keylength : C.int) return TSSL.DH
with Convention => C;
procedure Secure
(Source : Net.Socket_Type'Class;
Target : out Socket_Type;
Config : SSL.Config);
-- Common code for Secure_Server and Secure_Client routines
procedure Set_Accept_State (Socket : Socket_Type);
-- Server session initialization
procedure Set_Connect_State (Socket : Socket_Type; Host : String);
-- Client session initialization
-------------------------
-- 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
Success : Boolean;
begin
if New_Socket.Config = null then
Initialize_Default_Config;
New_Socket.Config := Default_Config;
end if;
SSL_Accept : loop
Net.Std.Accept_Socket (Socket, NSST (New_Socket));
New_Socket.Config.Set_IO (New_Socket);
Set_Accept_State (New_Socket);
Do_Handshake (New_Socket, Success);
exit SSL_Accept when Success;
Shutdown (New_Socket);
end loop SSL_Accept;
end Accept_Socket;
--------------------------
-- Add_Host_Certificate --
--------------------------
procedure Add_Host_Certificate
(Config : SSL.Config;
Host : String;
Certificate_Filename : String;
Key_Filename : String := "") is
begin
Config.Initialize_Host_Certificate
(Host, Certificate_Filename, Key_Filename);
end Add_Host_Certificate;
---------------------
-- BIO_Debug_Write --
---------------------
function BIO_Debug_Write
(BIO : TSSL.BIO_Access;
Buf : C.Strings.chars_ptr;
Size : C.int) return C.int
is
pragma Unreferenced (BIO);
begin
Debug_Output (C.Strings.Value (Buf, C.size_t (Size)));
return Size;
end BIO_Debug_Write;
------------------------
-- Cipher_Description --
------------------------
overriding function Cipher_Description
(Socket : Socket_Type) return String
is
Buffer : aliased C.char_array := (1 .. 256 => <>);
Result : constant String :=
C.Strings.Value
(TSSL.SSL_CIPHER_description
(TSSL.SSL_get_current_cipher (Socket.SSL).all,
Buffer'Unchecked_Access, Buffer'Length));
begin
if Result'Length > 0 and then Result (Result'Last) = ASCII.LF then
return Result (Result'First .. Result'Last - 1);
end if;
return Result;
end Cipher_Description;
-------------
-- Ciphers --
-------------
procedure Ciphers (Cipher : not null access procedure (Name : String)) is
use type C.Strings.chars_ptr;
Name : C.Strings.chars_ptr;
Ctx : constant TSSL.SSL_CTX := TSSL.SSL_CTX_new (TSSL.TLS_method);
SSL : SSL_Handle;
begin
Error_If (Ctx = TSSL.Null_CTX);
SSL := TSSL.SSL_new (Ctx);
Error_If (SSL = TSSL.Null_Handle);
for J in 0 .. C.int'Last loop
Name := TSSL.SSL_get_cipher_list (SSL, J);
exit when Name = C.Strings.Null_Ptr;
Cipher (C.Strings.Value (Name));
end loop;
TSSL.SSL_free (SSL);
TSSL.SSL_CTX_free (Ctx);
end Ciphers;
-------------------------
-- Clear_Session_Cache --
-------------------------
procedure Clear_Session_Cache (Config : SSL.Config := Null_Config) is
begin
if Config = Null_Config then
Default_Config.Clear_Session_Cache;
else
Config.Clear_Session_Cache;
end if;
end Clear_Session_Cache;
-------------
-- Connect --
-------------
overriding procedure Connect
(Socket : in out Socket_Type;
Host : String;
Port : Positive;
Wait : Boolean := True;
Family : Family_Type := Family_Unspec)
is
Success : Boolean;
begin
Net.Std.Connect (NSST (Socket), Host, Port, Wait, Family);
if Socket.Config = null then
Initialize_Default_Config;
Socket.Config := Default_Config;
end if;
Socket.Config.Set_IO (Socket);
if Socket.Sessn /= null then
Set_Session_Data (Socket, Socket.Sessn);
Socket.Sessn := null;
end if;
Set_Connect_State (Socket, Host);
if Wait then
-- Do handshake only in case of wait connection completion
Do_Handshake (Socket, Success);
if not Success then
declare
Error_Text : constant String := Error_Stack;
begin
Net.Log.Error (Socket, Error_Text);
Net.Std.Shutdown (NSST (Socket));
raise Socket_Error with Error_Text;
end;
end if;
end if;
end Connect;
--------------------
-- DH_Generate_cb --
--------------------
function DH_Generate_cb
(a, b : C.int; cb : access TSSL.BN_GENCB) return C.int
is
pragma Unreferenced (a, b, cb);
begin
return Boolean'Pos (not Abort_DH_Flag);
end DH_Generate_cb;
------------------
-- Do_Handshake --
------------------
procedure Do_Handshake
(Socket : in out Socket_Type; Success : out Boolean)
is
use TSSL;
Res : C.int;
begin
loop
Res := SSL_do_handshake (Socket.SSL);
Success := Res = 1;
exit when Success;
case SSL_get_error (Socket.SSL, Res) is
when SSL_ERROR_WANT_READ => Socket_Read (Socket);
when SSL_ERROR_WANT_WRITE => Socket_Write (Socket);
when others => exit;
end case;
end loop;
Socket_Write (Socket);
end Do_Handshake;
procedure Do_Handshake (Socket : in out Socket_Type) is
Success : Boolean;
begin
Do_Handshake (Socket, Success);
if not Success then
Raise_Socket_Error (Socket, Error_Stack);
end if;
end Do_Handshake;
--------------
-- Error_If --
--------------
procedure Error_If (Error : Boolean) is
begin
if Error then
Raise_Socket_Error
(Socket_Type'(Std.Socket_Type with others => <>), Error_Stack);
end if;
end Error_If;
procedure Error_If (Socket : Socket_Type; Error : Boolean) is
begin
if Error then
Raise_Socket_Error (Socket, Error_Stack);
end if;
end Error_If;
----------------
-- File_Error --
----------------
procedure File_Error (Prefix, Name : String) is
begin
raise Socket_Error with
Prefix & " file """ & Name & """ error." & ASCII.LF & Error_Stack;
end File_Error;
----------
-- Free --
----------
overriding procedure Free (Socket : in out Socket_Type) is
begin
if Socket.SSL /= TSSL.Null_Handle then
TSSL.SSL_free (Socket.SSL);
TSSL.BIO_free (Socket.IO);
Socket.SSL := TSSL.Null_Handle;
end if;
NSST (Socket).Free;
end Free;
----------
-- Free --
----------
procedure Free (Session : in out Session_Type) is
begin
if Session /= null then
TSSL.SSL_SESSION_free (TSSL.SSL_Session (Session));
Session := null;
end if;
end Free;
procedure Free (Key : in out Private_Key) is
begin
if Key /= Null_Private_Key then
EVP_PKEY_free (Key);
Key := Null_Private_Key;
end if;
end Free;
-----------------
-- Generate_DH --
-----------------
procedure Generate_DH is
use type TSSL.BIO_Access;
OK : Boolean;
DH : aliased TSSL.DH;
Bits : constant C.int := DH_Length;
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);
C_Name : aliased C.char_array := C.To_C (Filename);
IO : TSSL.BIO_Access;
begin
if Filename = "" then
return False;
end if;
IO := TSSL.BIO_new (TSSL.BIO_s_file);
Error_If (IO = null);
Error_If
(TSSL.BIO_read_filename
(IO, C.Strings.To_Chars_Ptr (C_Name'Unchecked_Access)) = 0);
Error_If
(TSSL.PEM_read_bio_DHparams (IO, DH'Access, null, TSSL.Null_Pointer)
/= DH);
DH_Time (DH_Time_Idx + 1) :=
Ada.Directories.Modification_Time (Filename);
DH_Time_Idx := DH_Time_Idx + 1;
TSSL.BIO_free (IO);
return True;
end Loaded;
----------
-- Save --
----------
procedure Save is
Filename : constant String :=
RSA_DH_Generators.Parameters_Filename
("dh-" & Utils.Image (Integer (Bits)), Exist => False);
C_Name : aliased C.char_array := C.To_C (Filename);
BIO : TSSL.BIO_Access;
begin
if Filename = "" then
return;
end if;
BIO := TSSL.BIO_new (TSSL.BIO_s_file);
Error_If (BIO = null);
Error_If
(TSSL.BIO_write_filename
(BIO, C.Strings.To_Chars_Ptr (C_Name'Unchecked_Access)) = 0);
Error_If (TSSL.PEM_write_bio_DHparams (BIO, DH) = 0);
TSSL.BIO_free (BIO);
end Save;
begin
DH_Lock.Try_Lock (OK);
if not OK then
return;
end if;
DH := TSSL.DH_new;
Error_If (DH = TSSL.Null_Pointer);
if DH_Params (0) /= TSSL.Null_Pointer or else not Loaded then
if TSSL.DH_generate_parameters_ex
(params => DH,
prime_len => DH_Length,
generator => (if DH_Time_Idx = 0 then 2 else 5),
cb => DH_Generate_Callback'Access) = 0
then
Error_If (not Abort_DH_Flag);
else
DH_Time (DH_Time_Idx + 1) := Ada.Calendar.Clock;
DH_Time_Idx := DH_Time_Idx + 1;
Save;
end if;
end if;
if DH_Params (1) /= TSSL.Null_Pointer then
TSSL.DH_free (DH_Params (1));
end if;
DH_Params (1) := DH_Params (0);
DH_Params (0) := DH;
DH_Lock.Unlock;
end Generate_DH;
------------------
-- Generate_RSA --
------------------
procedure Generate_RSA is
OK : Boolean;
BN : TSSL.BIGNUM;
RSA : TSSL.RSA;
begin
RSA_Lock.Try_Lock (OK);
if not OK then
return;
end if;
BN := TSSL.BN_new;
Error_If (TSSL."=" (BN, TSSL.BIGNUM (TSSL.Null_Pointer)));
Error_If (TSSL.BN_set_word (BN, TSSL.RSA_F4) = 0);
RSA := TSSL.RSA_new;
Error_If (RSA = TSSL.Null_Pointer);
Error_If
(TSSL.RSA_generate_key_ex
(RSA, RSA_Length, BN, TSSL.Null_Pointer) = 0);
TSSL.BN_free (BN);
if RSA_Params (1) /= TSSL.Null_Pointer then
TSSL.RSA_free (RSA_Params (1));
end if;
RSA_Params (1) := RSA_Params (0);
RSA_Params (0) := RSA;
RSA_Time (RSA_Time_Idx + 1) := Ada.Calendar.Clock;
RSA_Time_Idx := RSA_Time_Idx + 1;
RSA_Lock.Unlock;
end Generate_RSA;
-----------------
-- Init_Random --
-----------------
procedure Init_Random is
use Ada.Calendar;
use System.Storage_Elements;
Buf : String :=
Duration'Image
(Clock - Time_Of (Year => Year_Number'First,
Month => Month_Number'First,
Day => Day_Number'First))
& Integer_Address'Image (To_Integer (Init_Random'Address));
begin
TSSL.RAND_seed (Buf'Address, Buf'Length);
end Init_Random;
----------------
-- 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;
Config.Initialize
(Certificate_Filename, Security_Mode, Priorities, Ticket_Support,
Key_Filename, Exchange_Certificate, Certificate_Required,
Trusted_CA_Filename, CRL_Filename, Session_Cache_Size);
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.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
package CNF renames AWS.Config;
Default : CNF.Object renames CNF.Default_Config;
begin
Default_Config.Initialize
(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#);
end Initialize_Default_Config;
-----------------
-- Lib_Realloc --
-----------------
function Lib_Realloc
(Ptr : System.Address;
Size : System.Memory.size_t) return System.Address is
begin
if Ptr = System.Null_Address then
return System.Memory.Alloc (Size);
else
return System.Memory.Realloc (Ptr, Size);
end if;
end Lib_Realloc;
----------
-- Load --
----------
function Load (Filename : String) return Private_Key is
Key : aliased Private_Key := EVP_PKEY_new;
IO : constant TSSL.BIO_Access := TSSL.BIO_new (TSSL.BIO_s_file);
Name : aliased C.char_array := C.To_C (Filename);
Pwd : aliased C.char_array :=
C.To_C (Net.SSL.Certificate.Get_Password (Filename));
begin
if TSSL.BIO_read_filename
(IO, C.Strings.To_Chars_Ptr (Name'Unchecked_Access)) = 0
or else PEM_read_bio_PrivateKey
(IO, Key'Access, null,
(if Pwd'Length <= 1 -- 1 means just the nul char
then TSSL.Null_Pointer
else Pwd'Address)) /= Key
then
TSSL.BIO_free (IO);
EVP_PKEY_free (Key);
File_Error ("Key", Filename);
end if;
TSSL.BIO_free (IO);
return Key;
end Load;
---------------
-- Log_Error --
---------------
procedure Log_Error (Text : String) is
begin
Log.Error (Socket_Type'(Net.Std.Socket_Type with others => <>), Text);
end Log_Error;
-------------
-- Pending --
-------------
overriding function Pending
(Socket : Socket_Type) return Stream_Element_Count
is
Res : constant C.int := TSSL.SSL_pending (Socket.SSL);
begin
Error_If (Socket, Res < 0);
return Stream_Element_Count (Res);
end Pending;
-------------
-- Receive --
-------------
overriding procedure Receive
(Socket : Socket_Type;
Data : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
Len : C.int;
First : Stream_Element_Offset := Data'First;
begin
loop
Len := TSSL.SSL_read
(Socket.SSL, Data (First)'Address,
Data'Length - C.int (First - Data'First));
if Len > 0 then
First := First + Stream_Element_Offset (Len);
Last := First - 1;
exit when Last = Data'Last;
else
exit when First > Data'First and then NSST (Socket).Pending = 0;
case TSSL.SSL_get_error (Socket.SSL, Len) is
when TSSL.SSL_ERROR_WANT_READ => Socket_Read (Socket);
when TSSL.SSL_ERROR_WANT_WRITE => Socket_Write (Socket);
when TSSL.SSL_ERROR_SYSCALL =>
Raise_Socket_Error
(Socket,
"System error ("
& Utils.Image (OS_Lib.Socket_Errno)
& ") on SSL receive");
when TSSL.SSL_ERROR_ZERO_RETURN =>
if Len = 0 then
raise Socket_Error with Peer_Closed_Message;
else
Raise_Socket_Error (Socket, Error_Stack);
end if;
when others => Raise_Socket_Error (Socket, Error_Stack);
end case;
end if;
end loop;
end Receive;
-------------
-- Release --
-------------
procedure Release (Config : in out SSL.Config) is
procedure Free is new Unchecked_Deallocation (TS_SSL, SSL.Config);
begin
if Config /= null then
Config.Finalize;
Free (Config);
end if;
end Release;
------------
-- 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);
if Config = null then
Initialize_Default_Config;
Target.Config := Default_Config;
else
Target.Config := Config;
end if;
Target.Config.Set_IO (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);
Set_Connect_State (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);
Set_Accept_State (Result);
return Result;
end Secure_Server;
----------
-- Send --
----------
overriding procedure Send
(Socket : Socket_Type;
Data : Stream_Element_Array;
Last : out Stream_Element_Offset)
is
RC : C.int;
RW : constant RW_Data_Access := Net.Socket_Type (Socket).C;
Pack_Size : Stream_Element_Count :=
Stream_Element_Count'Min (RW.Pack_Size, Data'Length);
begin
if not Check (Socket, (Input => False, Output => True)) (Output) then
Last := Last_Index (Data'First, 0);
return;
end if;
if not RW.Can_Wait then
declare
Free : constant Stream_Element_Offset := Socket.Output_Space;
begin
if Free > 0
and then Pack_Size + Max_Overhead > Free
and then Socket.Output_Busy > 0
then
if Free <= Max_Overhead then
Last := Last_Index (Data'First, 0);
return;
else
Pack_Size := Free - Max_Overhead;
end if;
end if;
end;
end if;
loop
RC := TSSL.SSL_write (Socket.SSL, Data'Address, C.int (Pack_Size));
if RC > 0 then
if RC < C.int (Pack_Size) then
-- Pack_Size initialization. This condition would be true only
-- once per SSL socket.
RW.Pack_Size := Stream_Element_Count (RC);
end if;
Socket_Write (Socket, RC);
Last := Data'First + Stream_Element_Offset (RC) - 1;
return;
else
declare
Error_Code : constant C.int :=
TSSL.SSL_get_error (Socket.SSL, RC);
Err_Code : TSSL.Error_Code;
Err_No : Integer;
use type TSSL.Error_Code;
begin
case Error_Code is
when TSSL.SSL_ERROR_WANT_READ =>
Socket_Read (Socket);
when TSSL.SSL_ERROR_WANT_WRITE =>
Socket_Write (Socket);
when TSSL.SSL_ERROR_SYSCALL =>
Err_No := OS_Lib.Socket_Errno;
if Err_No = 0 then
Socket_Write (Socket);
Last := Data'First - 1;
return;
else
Raise_Socket_Error
(Socket,
"System error (" & Utils.Image (Err_No)
& ") on SSL send");
end if;
when others =>
Err_Code := TSSL.ERR_get_error;
if Err_Code = 0 then
Raise_Socket_Error
(Socket,
"Error ("
& Utils.Image (Integer (Error_Code))
& ") on SSL send");
else
Raise_Socket_Error (Socket, Error_Str (Err_Code));
end if;
end case;
end;
end if;
end loop;
end Send;
--------------------------
-- Server_Name_Callback --
--------------------------
function Server_Name_Callback
(Session : SSL_Handle;
ad : access C.int; -- documentation not found
Hosts : access Host_Certificates.Map) return C.int
is
pragma Unreferenced (ad);
use C.Strings;
Server_Name : constant chars_ptr := TSSL.SSL_get_servername (Session);
CH : Host_Certificates.Cursor;
Dummy : TSSL.SSL_CTX;
begin
if Server_Name = Null_Ptr then
return TSSL.SSL_TLSEXT_ERR_OK;
end if;
CH := Hosts.Find (Value (Server_Name));
if Host_Certificates.Has_Element (CH) then
Dummy := TSSL.SSL_set_SSL_CTX (Session, Hosts.all (CH));
end if;
return TSSL.SSL_TLSEXT_ERR_OK;
exception
when E : others =>
Log_Error (Ada.Exceptions.Exception_Information (E));
return TSSL.SSL_TLSEXT_ERR_ALERT_FATAL;
end Server_Name_Callback;
--------------------------
-- 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 else Config);
begin
return Cfg.Session_Cache_Number;
end Session_Cache_Number;
------------------
-- Session_Data --
------------------
function Session_Data (Socket : Socket_Type) return Session_Type is
begin
return Session_Type (TSSL.SSL_get1_session (Socket.SSL));
end Session_Data;
----------------------
-- Session_Id_Image --
----------------------
function Session_Id_Image (Session : Session_Type) return String is
use TSSL;
subtype Binary_Array is Stream_Element_Array (1 .. 1024);
type Binary_Access is access all Binary_Array;
function To_Array is new Unchecked_Conversion (Pointer, Binary_Access);
Len : aliased C.unsigned;
Id : Binary_Access;
begin
if Session = null then
return "";
end if;
Id := To_Array (SSL_SESSION_get_id (SSL_Session (Session), Len'Access));
return Translator.Base64_Encode (Id (1 .. Stream_Element_Offset (Len)));
end Session_Id_Image;
function Session_Id_Image (Socket : Socket_Type) return String is
begin
return Session_Id_Image
(Session_Type (TSSL.SSL_get_session (Socket.SSL)));
end Session_Id_Image;
--------------------
-- Session_Reused --
--------------------
function Session_Reused (Socket : Socket_Type) return Boolean is
use TSSL;
Rc : constant C.int := SSL_session_reused (Socket.SSL);
begin
if Rc = 0 then
return False;
end if;
Error_If (Socket, Rc /= 1);
return True;
end Session_Reused;
----------------------
-- Set_Accept_State --
----------------------
procedure Set_Accept_State (Socket : Socket_Type) is
begin
Socket.Config.Check_CRL;
TSSL.SSL_set_accept_state (Socket.SSL);
if RSA_Params (0) = TSSL.Null_Pointer
and then DH_Params (0) = TSSL.Null_Pointer
then
if not RSA_Lock.Locked and then not DH_Lock.Locked then
Start_Parameters_Generation (DH => True);
end if;
else
if RSA_Params (0) /= TSSL.Null_Pointer then
TSSL.SSL_set_tmp_rsa_callback
(SSL => Socket.SSL, RSA_CB => Tmp_RSA_Callback'Access);
end if;
if DH_Params (0) /= TSSL.Null_Pointer then
TSSL.SSL_set_tmp_dh_callback
(SSL => Socket.SSL, DH_CB => Tmp_DH_Callback'Access);
end if;
end if;
end Set_Accept_State;
----------------
-- Set_Config --
----------------
procedure Set_Config
(Socket : in out Socket_Type; Config : SSL.Config) is
begin
Socket.Config := Config;
end Set_Config;
-----------------------
-- Set_Connect_State --
-----------------------
procedure Set_Connect_State (Socket : Socket_Type; Host : String) is
begin
TSSL.SSL_set_connect_state (Socket.SSL);
if Host /= "" then
Error_If
(TSSL.SSL_set_tlsext_host_name (Socket.SSL, C.To_C (Host)) = 0);
end if;
end Set_Connect_State;
---------------
-- Set_Debug --
---------------
procedure Set_Debug
(Level : Natural; Output : Debug_Output_Procedure := null) is
begin
Debug_Level := Level;
Debug_Output := Output;
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.Set_Session_Cache_Size (Size);
else
Config.Set_Session_Cache_Size (Size);
end if;
end Set_Session_Cache_Size;
----------------------------
-- Set_Session_Cache_Size --
----------------------------
procedure Set_Session_Cache_Size
(Context : TSSL.SSL_CTX; Size : Integer) is
begin
case TSSL.SSL_CTX_set_session_cache_mode
(Ctx => Context,
Mode => (if Size = 0 then TSSL.SSL_SESS_CACHE_OFF
else TSSL.SSL_SESS_CACHE_SERVER))
is
when TSSL.SSL_SESS_CACHE_OFF | TSSL.SSL_SESS_CACHE_SERVER => null;
when others =>
raise Socket_Error with "Unexpected session cache mode";
end case;
Error_If
(TSSL.SSL_CTX_ctrl
(Ctx => Context,
Cmd => TSSL.SSL_CTRL_SET_SESS_CACHE_SIZE,
Larg => C.long (Size),
Parg => TSSL.Null_Pointer) = -1);
end Set_Session_Cache_Size;
----------------------
-- Set_Session_Data --
----------------------
procedure Set_Session_Data
(Socket : in out Socket_Type; Data : Session_Type) is
begin
if Socket.SSL = TSSL.Null_Handle or else Socket.Get_FD = No_Socket then
Socket.Sessn := Data;
else
Error_If
(Socket,
TSSL.SSL_set_session (Socket.SSL, TSSL.SSL_Session (Data)) = 0);
end if;
end Set_Session_Data;
-------------------------
-- Set_Verify_Callback --
-------------------------
procedure Set_Verify_Callback
(Config : in out SSL.Config; Callback : System.Address) is
begin
Config.Set_Verify_Callback (Callback);
end Set_Verify_Callback;
--------------
-- Shutdown --
--------------
overriding procedure Shutdown
(Socket : Socket_Type; How : Shutmode_Type := Shut_Read_Write)
is
RC : C.int;
Both : Boolean := False;
function Error_Processing return Boolean;
-- Exit from shutdown loop on True result
----------------------
-- Error_Processing --
----------------------
function Error_Processing return Boolean is
Error_Code : constant C.int := TSSL.SSL_get_error (Socket.SSL, RC);
Err_Code : TSSL.Error_Code;
RIO : TSSL.BIO_Access;
BIO : TSSL.BIO_Access;
Retry : aliased C.int;
use type TSSL.Error_Code, TSSL.BIO_Access;
begin
case Error_Code is
when TSSL.SSL_ERROR_WANT_READ =>
if Net.Socket_Type (Socket).Timeout > Shutdown_Read_Timeout then
Socket_Write (Socket);
Wait_For (Input, NSST (Socket), Shutdown_Read_Timeout);
end if;
Socket_Read (Socket);
when TSSL.SSL_ERROR_WANT_WRITE =>
Socket_Write (Socket);
when TSSL.SSL_ERROR_SYSCALL =>
RIO := TSSL.BIO_get_retry_BIO (Socket.IO, Retry'Access);
BIO := TSSL.SSL_get_rbio (Socket.SSL);
Err_Code := TSSL.ERR_get_error;
if Err_Code /= 0
or else TSSL.SSL_want (Socket.SSL) /= TSSL.SSL_NOTHING
or else Retry /= 0
or else Socket.IO.Flags /= 0
or else RIO.Flags /= 0
or else BIO.Flags /= 0
or else Socket.Pending /= 0
then
Net.Log.Error
(Socket,
"Unexpected SSL_ERROR_SYSCALL "
& Boolean'Image (RIO = Socket.IO)
& ' ' & Boolean'Image (BIO = Socket.IO)
& Err_Code'Img
& TSSL.SSL_want (Socket.SSL)'Img
& Retry'Img
& Socket.IO.Flags'Img
& RIO.Flags'Img
& BIO.Flags'Img
& Socket.Pending'Img
& Std.Pending (NSST (Socket))'Img);
return True;
end if;
when others =>
Err_Code := TSSL.ERR_get_error;
if Err_Code = 0 then
Net.Log.Error
(Socket,
"Error (" & Utils.Image (Integer (Error_Code))
& ") on SSL shutdown");
else
Net.Log.Error (Socket, Error_Str (Err_Code));
end if;
return True;
end case;
return False;
exception
when Socket_Error =>
return True;
end Error_Processing;
begin
if Socket.SSL /= TSSL.Null_Handle then
loop
RC := TSSL.SSL_shutdown (Socket.SSL);
exit when RC > 0;
if RC = 0 then
-- First part of bidirectional shutdown done
if How = Shut_Write then
exit;
end if;
if Both then
exit when Error_Processing;
else
Both := True;
end if;
else
exit when Error_Processing;
end if;
end loop;
end if;
Net.Std.Shutdown (NSST (Socket), How);
end Shutdown;
---------------
-- Signature --
---------------
function Signature
(Ptr : System.Address;
Size : C.size_t;
Key : Private_Key;
Hash : Hash_Method) return Stream_Element_Array
is
use TSSL;
use type C.unsigned, C.size_t;
To_EVP_MD : constant array (Hash_Method) of EVP_MD :=
(MD5 => EVP_md5,
SHA1 => EVP_sha1,
SHA224 => EVP_sha224,
SHA256 => EVP_sha256,
SHA384 => EVP_sha384,
SHA512 => EVP_sha512);
Md : constant EVP_MD := To_EVP_MD (Hash);
D_Ctx : constant EVP_MD_CTX := EVP_MD_CTX_new;
Dig : Stream_Element_Array
(1 .. Stream_Element_Offset (EVP_MD_size (Md)));
D_Size : aliased C.unsigned := Dig'Length;
S_Ctx : EVP_PKEY_CTX;
Res : Stream_Element_Array
(1 .. Stream_Element_Offset (EVP_PKEY_size (Key)));
S_Size : aliased C.size_t := Res'Length;
begin
Error_If (EVP_DigestInit (D_Ctx, Md) = 0);
Error_If (EVP_DigestUpdate (D_Ctx, Ptr, Size) = 0);
Error_If (EVP_DigestFinal (D_Ctx, Dig'Address, D_Size'Access) = 0);
EVP_MD_CTX_free (D_Ctx);
if D_Size /= Dig'Length then
raise Program_Error with "Digest length error";
end if;
S_Ctx := SSL.EVP_PKEY_CTX_new (Key, ENGINE (Null_Pointer));
Error_If (S_Ctx = EVP_PKEY_CTX (Null_Pointer));
Error_If (EVP_PKEY_sign_init (S_Ctx) <= 0);
Error_If (EVP_PKEY_CTX_set_signature_md (S_Ctx, To_EVP_MD (Hash)) <= 0);
Error_If
(EVP_PKEY_sign
(S_Ctx, Res'Address, S_Size'Access, Dig'Address, Dig'Length) <= 0);
EVP_PKEY_CTX_free (S_Ctx);
if S_Size > Res'Length then
raise Program_Error with
"Signature length error " & S_Size'Img & Res'Length'Img;
end if;
return Res (1 .. Stream_Element_Offset (S_Size));
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;
-----------------
-- Socket_Read --
-----------------
procedure Socket_Read (Socket : Socket_Type) is
use TSSL;
Data : aliased Memory_Access;
Len : Stream_Element_Offset;
Last : Stream_Element_Offset;
begin
Socket_Write (Socket);
Len := Stream_Element_Offset (BIO_nwrite0 (Socket.IO, Data'Address));
Net.Std.Receive (NSST (Socket), Data (1 .. Len), Last);
if TSSL.BIO_nwrite (Socket.IO, Data'Address, C.int (Last))
/= C.int (Last)
then
raise Socket_Error with "Not enought memory.";
end if;
end Socket_Read;
------------------
-- Socket_Write --
------------------
procedure Socket_Write (Socket : Socket_Type; Gone : C.int := 0) is
use TSSL;
Data : aliased Memory_Access;
Cnt : constant C.int := BIO_nread0 (Socket.IO, Data'Address);
Cnt1 : C.int;
Last : Stream_Element_Offset;
Plain : constant Net.Std.Socket_Type := NSST (Socket);
begin
if Cnt <= 0 then
return;
end if;
if Gone > 0 and then Cnt - Gone > C.int (Max_Overhead) then
-- Looks like Max_Overhead is not enought
Max_Overhead := Stream_Element_Offset (Cnt - Gone);
Log.Error
(Socket,
"Increase Max_Overhead to" & Max_Overhead'Img
& " in the aws-net-ssl_openssl.adb to avoid send locking");
end if;
Plain.Send (Data (1 .. Stream_Element_Offset (Cnt)), Last);
if Last < Stream_Element_Offset (Cnt) then
if not Net.Socket_Type (Socket).C.Can_Wait then
Log.Error (Socket, "Unexpected blocking send");
end if;
-- Most likely Max_Overhead value is not enought, send rest data
-- locking.
Plain.Send (Data (Last + 1 .. Stream_Element_Offset (Cnt)));
end if;
Cnt1 := BIO_nread (Socket.IO, Data'Address, Cnt);
if Cnt1 /= Cnt then
if SSL_get_shutdown (Socket.SSL) /= 0 then
Log.Error (Socket, "Shutdown detected" & Cnt'Img & Cnt1'Img);
else
raise Program_Error with Cnt'Img & Cnt1'Img;
end if;
end if;
end Socket_Write;
-------------
-- Locking --
-------------
package body Locking is
type Task_Identifier is new C.unsigned_long;
type Lock_Index is new C.int;
type Mode_Type is mod 2 ** C.int'Size;
type Task_Data is record
TID : Task_Identifier;
end record;
subtype Filename_Type is C.Strings.chars_ptr;
subtype Line_Number is C.int;
Finalized : Boolean := False;
-- Need to avoid access to finalized protected locking objects
package Task_Identifiers is new Task_Attributes (Task_Data, (TID => 0));
procedure Finalize;
protected Task_Id_Generator is
procedure Get_Task_Id (Id : out Task_Identifier) with
Post => Id > 0;
-- Return a uniq Id starting from 1 and incrementing one by one
procedure Finalize_Task
(Cause : Task_Termination.Cause_Of_Termination;
T : Task_Identification.Task_Id;
X : Exceptions.Exception_Occurrence);
private
Id_Counter : Task_Identifier := 0;
end Task_Id_Generator;
subtype RW_Mutex is AWS.Utils.RW_Semaphore (1);
type RW_Mutex_Access is access all RW_Mutex;
Locks : array (1 .. Lock_Index (TSSL.CRYPTO_num_locks)) of RW_Mutex;
F : Utils.Finalizer (Finalize'Access) with Unreferenced;
procedure Lock (Mode : Mode_Type; Locker : in out RW_Mutex) with Inline;
procedure Locking_Function
(Mode : Mode_Type;
N : Lock_Index;
File : Filename_Type;
Line : Line_Number)
with Convention => C;
function Dyn_Create
(File : Filename_Type; Line : Line_Number) return RW_Mutex_Access
with Convention => C;
procedure Dyn_Lock
(Mode : Mode_Type;
Locker : RW_Mutex_Access;
File : Filename_Type;
Line : Line_Number)
with Convention => C;
procedure Dyn_Destroy
(Locker : RW_Mutex_Access;
File : Filename_Type;
Line : Line_Number)
with Convention => C;
function Get_Task_Identifier return Task_Identifier with Convention => C;
----------------
-- Dyn_Create --
----------------
function Dyn_Create
(File : Filename_Type; Line : Line_Number) return RW_Mutex_Access
is
pragma Unreferenced (File, Line);
begin
return new RW_Mutex;
end Dyn_Create;
-----------------
-- Dyn_Destroy --
-----------------
procedure Dyn_Destroy
(Locker : RW_Mutex_Access;
File : Filename_Type;
Line : Line_Number)
is
pragma Unreferenced (File, Line);
Temp : RW_Mutex_Access := Locker;
procedure Free is
new Unchecked_Deallocation (RW_Mutex, RW_Mutex_Access);
begin
Free (Temp);
end Dyn_Destroy;
--------------
-- Dyn_Lock --
--------------
procedure Dyn_Lock
(Mode : Mode_Type;
Locker : RW_Mutex_Access;
File : Filename_Type;
Line : Line_Number)
is
pragma Unreferenced (File, Line);
begin
Lock (Mode, Locker.all);
end Dyn_Lock;
--------------
-- Finalize --
--------------
procedure Finalize is
begin
for J in DH_Params'Range loop
if DH_Params (J) /= TSSL.Null_Pointer then
TSSL.DH_free (DH_Params (J));
DH_Params (J) := TSSL.Null_Pointer;
end if;
end loop;
Finalized := True;
end Finalize;
-------------------------
-- Get_Task_Identifier --
-------------------------
function Get_Task_Identifier return Task_Identifier is
TA : constant Task_Identifiers.Attribute_Handle :=
Task_Identifiers.Reference;
begin
if TA.TID = 0 then
Task_Id_Generator.Get_Task_Id (TA.TID);
Task_Termination.Set_Specific_Handler
(Task_Identification.Current_Task,
Task_Id_Generator.Finalize_Task'Access);
end if;
return TA.TID;
end Get_Task_Identifier;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
-- We do not have to install thread id_callback on MS Windows and
-- on platforms where getpid returns different id for each thread.
-- But it is easier to install it for all platforms.
TSSL.CRYPTO_set_id_callback (Get_Task_Identifier'Address);
TSSL.CRYPTO_set_locking_callback (Locking_Function'Address);
TSSL.CRYPTO_set_dynlock_create_callback (Dyn_Create'Address);
TSSL.CRYPTO_set_dynlock_lock_callback (Dyn_Lock'Address);
TSSL.CRYPTO_set_dynlock_destroy_callback (Dyn_Destroy'Address);
end Initialize;
----------
-- Lock --
----------
procedure Lock (Mode : Mode_Type; Locker : in out RW_Mutex) is
begin
if Finalized then
return;
end if;
case Mode is
when TSSL.CRYPTO_LOCK or TSSL.CRYPTO_WRITE =>
Locker.Write;
when TSSL.CRYPTO_LOCK or TSSL.CRYPTO_READ =>
Locker.Read;
when TSSL.CRYPTO_UNLOCK or TSSL.CRYPTO_WRITE =>
Locker.Release_Write;
when TSSL.CRYPTO_UNLOCK or TSSL.CRYPTO_READ =>
Locker.Release_Read;
when others => null;
end case;
end Lock;
----------------------
-- Locking_Function --
----------------------
procedure Locking_Function
(Mode : Mode_Type;
N : Lock_Index;
File : Filename_Type;
Line : Line_Number)
is
pragma Unreferenced (File, Line);
begin
Lock (Mode, Locks (N));
end Locking_Function;
-----------------------
-- Task_Id_Generator --
-----------------------
protected body Task_Id_Generator is
-------------------
-- Finalize_Task --
-------------------
procedure Finalize_Task
(Cause : Task_Termination.Cause_Of_Termination;
T : Task_Identification.Task_Id;
X : Exceptions.Exception_Occurrence)
is
pragma Unreferenced (Cause, X);
begin
TSSL.ERR_remove_state (C.int (Task_Identifiers.Reference (T).TID));
end Finalize_Task;
-----------------
-- Get_Task_Id --
-----------------
procedure Get_Task_Id (Id : out Task_Identifier) is
begin
Id_Counter := Id_Counter + 1;
Id := Id_Counter;
end Get_Task_Id;
end Task_Id_Generator;
end Locking;
---------------------------------
-- 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;
---------------------
-- Tmp_DH_Callback --
---------------------
function Tmp_DH_Callback
(SSL : SSL_Handle; Is_Export : C.int; Keylength : C.int) return TSSL.DH
is
pragma Unreferenced (SSL, Is_Export, Keylength);
-- Ignore export restrictions
begin
return DH_Params (0);
end Tmp_DH_Callback;
----------------------
-- Tmp_RSA_Callback --
----------------------
function Tmp_RSA_Callback
(SSL : SSL_Handle; Is_Export : C.int; Keylength : C.int) return TSSL.RSA
is
pragma Unreferenced (SSL, Is_Export, Keylength);
-- Ignore export restrictions
begin
return RSA_Params (0);
end Tmp_RSA_Callback;
------------
-- TS_SSL --
------------
protected body TS_SSL is
---------------
-- Check_CRL --
---------------
procedure Check_CRL is
use type Ada.Calendar.Time;
use type C.Strings.chars_ptr;
procedure Reload_CRL_File (Context : TSSL.SSL_CTX);
---------------------
-- Reload_CRL_File --
---------------------
procedure Reload_CRL_File (Context : TSSL.SSL_CTX) is
Store : constant TSSL.X509_STORE :=
TSSL.SSL_CTX_get_cert_store (Context);
Lookup : constant TSSL.X509_LOOKUP :=
TSSL.X509_STORE_add_lookup
(Store, TSSL.X509_LOOKUP_file);
Param : constant TSSL.X509_VERIFY_PARAM :=
TSSL.X509_VERIFY_PARAM_new;
begin
-- Load CRL
Error_If
(TSSL.X509_load_crl_file
(Lookup, CRL_Filename, TSSL.X509_FILETYPE_PEM) /= 1);
-- Set up certificate store to check CRL
Error_If
(TSSL.X509_VERIFY_PARAM_set_flags
(Param, TSSL.X509_V_FLAG_CRL_CHECK) < 0);
Error_If (TSSL.X509_STORE_set1_param (Store, Param) < 0);
TSSL.X509_VERIFY_PARAM_free (Param);
end Reload_CRL_File;
begin
-- We need to load the CRL file if CRL_Time_Stamp is AWS_Epoch (it
-- has never been loaded) or the time stamp has changed on disk.
if CRL_Filename /= C.Strings.Null_Ptr then
declare
TS : constant Calendar.Time :=
Utils.File_Time_Stamp (C.Strings.Value (CRL_Filename));
begin
if CRL_Time_Stamp = Utils.AWS_Epoch
or else CRL_Time_Stamp /= TS
then
CRL_Time_Stamp := TS;
Reload_CRL_File (Default_Context);
for Context of Hosts loop
Reload_CRL_File (Context);
end loop;
end if;
end;
end if;
end Check_CRL;
-------------------------
-- Clear_Session_Cache --
-------------------------
procedure Clear_Session_Cache is
begin
TSSL.SSL_CTX_flush_sessions (Default_Context, C.long'Last);
for Context of Hosts loop
TSSL.SSL_CTX_flush_sessions (Context, C.long'Last);
end loop;
end Clear_Session_Cache;
----------------
-- File_Error --
----------------
procedure File_Error (Prefix, Name : String) is
begin
raise Socket_Error
with Prefix & " file """ & Name & """ error." & ASCII.LF
& Error_Stack;
end File_Error;
--------------
-- Finalize --
--------------
procedure Finalize is
begin
TSSL.SSL_CTX_free (Default_Context);
Default_Context := TSSL.Null_CTX;
for Context of Hosts loop
TSSL.SSL_CTX_free (Context);
end loop;
Hosts.Clear;
C.Strings.Free (Trusted_CA_Filename);
C.Strings.Free (CRL_Filename);
C.Strings.Free (Priorities);
end Finalize;
----------------
-- 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
Prepare
(Security_Mode, Priorities, Ticket_Support, Exchange_Certificate,
Certificate_Required, Trusted_CA_Filename, CRL_Filename,
Session_Cache_Size);
Initialize_Host_Certificate ("", Certificate_Filename, Key_Filename);
end Initialize;
---------------------------------
-- Initialize_Host_Certificate --
---------------------------------
procedure Initialize_Host_Certificate
(Host : String;
Certificate_Filename : String;
Key_Filename : String)
is
use C.Strings;
use Interfaces.C;
type Meth_Func is access function return TSSL.SSL_Method
with Convention => C;
procedure Set_Certificate;
Methods : constant array (Method) of Meth_Func :=
(TLS => TSSL.TLS_method'Access,
TLS_Server => TSSL.TLS_server_method'Access,
TLS_Client => TSSL.TLS_client_method'Access,
TLSv1 => TSSL.TLSv1_method'Access,
TLSv1_Server => TSSL.TLSv1_server_method'Access,
TLSv1_Client => TSSL.TLSv1_client_method'Access,
TLSv1_1 => TSSL.TLSv1_1_method'Access,
TLSv1_1_Server => TSSL.TLSv1_1_server_method'Access,
TLSv1_1_Client => TSSL.TLSv1_1_client_method'Access,
TLSv1_2 => TSSL.TLSv1_2_method'Access,
TLSv1_2_Server => TSSL.TLSv1_2_server_method'Access,
TLSv1_2_Client => TSSL.TLSv1_2_client_method'Access);
Context : TSSL.SSL_CTX;
Dummy : C.long;
---------------------
-- Set_Certificate --
---------------------
procedure Set_Certificate is
use type TSSL.STACK_OF_X509_NAME;
PK : constant Private_Key :=
Load ((if Key_Filename = ""
then Certificate_Filename else Key_Filename));
begin
-- Get the single certificate or certificate chain from
-- the file Cert_Filename.
if TSSL.SSL_CTX_use_certificate_chain_file
(Ctx => Context, File => To_C (Certificate_Filename)) /= 1
then
File_Error ("Certificate", Certificate_Filename);
end if;
Error_If
(TSSL.SSL_CTX_use_PrivateKey (Context, TSSL.EVP_PKEY (PK)) /= 1);
Error_If (TSSL.SSL_CTX_check_private_key (Ctx => Context) /= 1);
if Exchange_Certificate then
declare
Data : aliased constant Stream_Element_Array :=
Signature (Command_Line.Command_Name, PK, SHA224);
begin
Error_If
(TSSL.SSL_CTX_set_session_id_context
(Context, Data'Address,
C.unsigned'Min
(TSSL.SSL_MAX_SSL_SESSION_ID_LENGTH, Data'Length))
= 0);
end;
end if;
-- Set Trusted Certificate Authority if any
if Trusted_CA_Filename /= Null_Ptr then
Error_If
(TSSL.SSL_CTX_load_verify_locations
(Context, Trusted_CA_Filename, Null_Ptr) /= 1);
if Exchange_Certificate then
-- Let server send to client CA authority names it trust
if Trusted_CA_Stack = TSSL.Null_STACK_OF_X509_NAME then
Trusted_CA_Stack := TSSL.SSL_load_client_CA_file
(Trusted_CA_Filename);
else
Trusted_CA_Stack := TSSL.SSL_dup_CA_list
(Trusted_CA_Stack);
end if;
TSSL.SSL_CTX_set_client_CA_list (Context, Trusted_CA_Stack);
end if;
end if;
end Set_Certificate;
begin
if Default_Context /= TSSL.Null_CTX and then Host = "" then
return;
end if;
-- Initialize context
Context := TSSL.SSL_CTX_new (Methods (Security_Mode).all);
Error_If (Context = TSSL.Null_CTX);
if not Ticket_Support then
Error_If
(TSSL.SSL_CTX_set_options (Context, TSSL.SSL_OP_NO_TICKET) = 0);
end if;
Error_If
(TSSL.SSL_CTX_ctrl
(Ctx => Context,
Cmd => TSSL.SSL_CTRL_MODE,
Larg => TSSL.SSL_MODE_ENABLE_PARTIAL_WRITE
+ TSSL.SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER,
Parg => TSSL.Null_Pointer) = 0);
if Exchange_Certificate then
-- Client is requested to send its certificate once
Error_If
(TSSL.SSL_CTX_set_ex_data
(Context, Data_Index, TSSL.Null_Pointer) = -1);
declare
Mode : C.int :=
TSSL.SSL_VERIFY_PEER + TSSL.SSL_VERIFY_CLIENT_ONCE;
begin
if Certificate_Required then
Mode := Mode + TSSL.SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
end if;
TSSL.SSL_CTX_set_verify
(Context, Mode, Verify_Callback'Address);
end;
end if;
if Certificate_Filename /= "" then
Set_Certificate;
end if;
if Priorities /= Null_Ptr
and then TSSL.SSL_CTX_set_cipher_list (Context, Priorities) = 0
then
Log_Error (Error_Stack);
-- Do not try to set priorities with errors again
Free (Priorities);
end if;
Set_Session_Cache_Size (Context, Session_Cache_Size);
Dummy := TSSL.SSL_CTX_set_tlsext_servername_callback
(Context, Server_Name_Callback'Address);
Dummy := TSSL.SSL_CTX_set_tlsext_servername_arg
(Context, Hosts'Address);
if Host = "" then
Default_Context := Context;
else
Hosts.Insert (Host, Context);
end if;
if Certificate_Filename /= "" then
Check_CRL;
end if;
end Initialize_Host_Certificate;
-------------
-- Prepare --
-------------
procedure Prepare
(Security_Mode : Method;
Priorities : String;
Ticket_Support : Boolean;
Exchange_Certificate : Boolean;
Certificate_Required : Boolean;
Trusted_CA_Filename : String;
CRL_Filename : String;
Session_Cache_Size : Natural)
is
use C.Strings;
function New_C_String (Item : String) return chars_ptr is
(if Item = "" then Null_Ptr else New_String (Item));
begin
TS_SSL.Security_Mode := Security_Mode;
TS_SSL.Ticket_Support := Ticket_Support;
TS_SSL.Exchange_Certificate := Exchange_Certificate;
TS_SSL.Certificate_Required := Certificate_Required;
TS_SSL.Session_Cache_Size := Session_Cache_Size;
TS_SSL.CRL_Filename := New_C_String (CRL_Filename);
TS_SSL.Priorities := New_C_String (Priorities);
TS_SSL.Trusted_CA_Filename := New_C_String (Trusted_CA_Filename);
end Prepare;
--------------------------
-- Session_Cache_Number --
--------------------------
function Session_Cache_Number return Natural is
use TSSL;
begin
-- ??? Maybe summary ?
return Natural
(SSL_CTX_ctrl (Default_Context, SSL_CTRL_SESS_NUMBER, 0,
Null_Pointer));
end Session_Cache_Number;
------------
-- Set_IO --
------------
procedure Set_IO (Socket : in out Socket_Type) is
use TSSL;
Inside_IO, Net_IO : aliased BIO_Access;
begin
Socket.SSL := SSL_new (Default_Context);
Error_If (Socket, Socket.SSL = Null_Handle);
Error_If
(BIO_new_bio_pair (Inside_IO'Access, 0, Net_IO'Access, 0) = 0);
case Debug_Level is
when 0 => null;
when 1 => BIO_set_callback (Inside_IO, BIO_debug_callback'Access);
when 2 => BIO_set_callback (Net_IO, BIO_debug_callback'Access);
when others =>
BIO_set_callback (Inside_IO, BIO_debug_callback'Access);
BIO_set_callback (Net_IO, BIO_debug_callback'Access);
end case;
if Debug_Output /= null then
if Debug_BIO_Output = null then
Debug_BIO_Method := TSSL.BIO_s_null;
Debug_BIO_Method.Bwrite := BIO_Debug_Write'Address;
Debug_BIO_Output := TSSL.BIO_new (Debug_BIO_Method);
end if;
BIO_set_callback_arg (Inside_IO, Debug_BIO_Output);
BIO_set_callback_arg (Net_IO, Debug_BIO_Output);
end if;
Socket.IO := Net_IO;
SSL_set_bio (Socket.SSL, Inside_IO, Inside_IO);
end Set_IO;
----------------------------
-- Set_Session_Cache_Size --
----------------------------
procedure Set_Session_Cache_Size (Size : Natural) is
begin
Set_Session_Cache_Size (Default_Context, Size);
for Context of Hosts loop
Set_Session_Cache_Size (Context, Size);
end loop;
end Set_Session_Cache_Size;
-------------------------
-- Set_Verify_Callback --
-------------------------
procedure Set_Verify_Callback (Callback : System.Address) is
procedure Set_Callback (Context : TSSL.SSL_CTX);
------------------
-- Set_Callback --
------------------
procedure Set_Callback (Context : TSSL.SSL_CTX) is
begin
Error_If
(TSSL.SSL_CTX_set_ex_data
(Context, Data_Index, Callback) = -1);
end Set_Callback;
begin
Set_Callback (Default_Context);
for Context of Hosts loop
Set_Callback (Context);
end loop;
end Set_Verify_Callback;
end TS_SSL;
---------------------
-- Verify_Callback --
---------------------
function Verify_Callback
(preverify_ok : C.int; ctx : TSSL.X509_STORE_CTX) return C.int
is
use type C.unsigned;
use type Net.SSL.Certificate.Verify_Callback;
function To_Callback is new Unchecked_Conversion
(System.Address, Net.SSL.Certificate.Verify_Callback);
CB : aliased Net.SSL.Certificate.Verify_Callback;
SSL : SSL_Handle;
SSL_CTX : TSSL.SSL_CTX;
Cert : TSSL.X509;
Res : C.int := preverify_ok;
Mode : C.unsigned;
Status : C.int;
begin
-- The SSL structure
SSL := TSSL.X509_STORE_CTX_get_ex_data
(ctx, TSSL.SSL_get_ex_data_X509_STORE_CTX_idx);
-- The SSL context, this is the one we are looking for as it contains
-- the register callback.
SSL_CTX := TSSL.SSL_get_SSL_CTX (SSL);
-- Get the current verification mode
Mode := TSSL.SSL_get_verify_mode (SSL);
-- Get the certificate as stored into the context
Cert := TSSL.X509_STORE_CTX_get_current_cert (ctx);
-- Get current error status, this will be stored into the certificate
-- by the read routine below. It will be available in the user's verify
-- callback if needed.
Status := TSSL.X509_STORE_CTX_get_error (ctx);
-- Get the user's callback stored at the Data_Index
CB := To_Callback (TSSL.SSL_CTX_get_ex_data (SSL_CTX, Data_Index));
if CB /= null then
if CB (Net.SSL.Certificate.Impl.Read (Status, Cert)) then
Res := 1;
else
Res := 0;
end if;
end if;
-- If we did not ask to fail if no peer cert was received just
-- unconditionally returns 1 (OK).
if (Mode and TSSL.SSL_VERIFY_FAIL_IF_NO_PEER_CERT) = 0 then
return 1;
else
return Res;
end if;
end Verify_Callback;
-------------
-- Version --
-------------
function Version (Build_Info : Boolean := False) return String is
use TSSL;
Result : constant String :=
C.Strings.Value (OpenSSL_version (OPENSSL_VERSION0));
begin
if Build_Info then
return Result & ASCII.LF
& C.Strings.Value (OpenSSL_version (OPENSSL_CFLAGS)) & ASCII.LF
& C.Strings.Value (OpenSSL_version (OPENSSL_BUILT_ON)) & ASCII.LF
& C.Strings.Value (OpenSSL_version (OPENSSL_PLATFORM)) & ASCII.LF
& C.Strings.Value (OpenSSL_version (OPENSSL_DIR));
else
return Result;
end if;
end Version;
begin
-- Set the RTL memory allocation routines is necessary only to be able
-- gnatmem control memory leak allocated inside of OpenSSL library.
if TSSL.CRYPTO_set_mem_functions
(M => System.Memory.Alloc'Address,
R => Lib_Realloc'Address,
F => System.Memory.Free'Address) = 0
then
-- In "OpenSSL FIPS Object Module" based on OpenSSL version 1.0.1e
-- we are unable to setup our own memory allocation routines. GNATMEM
-- would not be aware of memory allocations inside of OpenSSL in this
-- case, but AWS is able to run anyway.
null;
end if;
Locking.Initialize;
if TSSL.SSL_library_init = 0 then
raise Program_Error with "Unable to init OpenSSL";
end if;
Init_Random;
Data_Index :=
TSSL.SSL_CTX_get_ex_new_index
(0, TSSL.Null_Pointer, TSSL.Null_Pointer,
TSSL.Null_Pointer, TSSL.Null_Pointer);
end AWS.Net.SSL;
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