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{
Simple low-level example using the GnuTLS binding for how generate an own CA
and self-signed certificate for HTTP server and client.
Author: Silvio Clecio (silvioprog)
Date: Wed Jan 9 03:10:58 BRT 2019
GnuTLS version: 3.4+
Testing the generated files.
Server side:
gnutls-serv --port 8080 --http \
--x509cafile ca.pem \
--x509keyfile server.key \
--x509certfile server.pem
Client side:
curl -k --key client.key --cert client.pem https://localhost:8080
or:
gnutls-cli localhost --port 8080 --insecure \
--x509keyfile client.key \
--x509certfile client.pem
}
program srvcacert;
{$MODE OBJFPC}{$H+}
{$ASSERTIONS ON}
uses
sysutils,
classes,
dateutils,
ctypes,
gnutls;
const
CA_KEY = 'ca.key';
CA_PEM = 'ca.pem';
SERVER_KEY = 'server.key';
SERVER_PEM = 'server.pem';
CLIENT_KEY = 'client.key';
CLIENT_PEM = 'client.pem';
CERT_SIZE = 4096;
type
EGnuTLS = Exception;
procedure Save(const S: AnsiString; const AFileName: TFileName);
begin
with TStringStream.Create(S) do
try
SaveToFile(AFileName);
finally
Free;
end;
end;
procedure TLSCheckRet(Aret: cint); inline;
begin
if Aret <> GNUTLS_E_SUCCESS then
raise EGnuTLS.Create(gnutls_strerror(Aret));
end;
procedure TLSCheck(Aexp: Boolean; Aret: cint); inline;
begin
if Aexp then
raise EGnuTLS.Create(gnutls_strerror(Aret));
end;
procedure TLSGenPrivKey(out Apriv_key: AnsiString);
var
Vkey: Tgnutls_x509_privkey_t;
Vpriv_key_size: cuint;
begin
try
TLSCheckRet(gnutls_x509_privkey_init(@Vkey));
Vpriv_key_size := gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA,
GNUTLS_SEC_PARAM_HIGH);
Apriv_key := '';
SetLength(Apriv_key, Pred(Vpriv_key_size));
TLSCheckRet(gnutls_x509_privkey_generate(Vkey, GNUTLS_PK_RSA,
Vpriv_key_size, 0));
TLSCheckRet(gnutls_x509_privkey_export(Vkey, GNUTLS_X509_FMT_PEM,
@Apriv_key[1], @Vpriv_key_size));
SetLength(Apriv_key, Pred(Vpriv_key_size));
except
gnutls_x509_privkey_deinit(Vkey);
raise;
end;
end;
procedure TLSGenCACert(const Aca_priv_key: AnsiString; out Aca_pem: AnsiString;
const Acommon_name, Aserial: AnsiString; Adays: Word);
var
Vkey: Tgnutls_x509_privkey_t;
Vcrt: Tgnutls_x509_crt_t = nil;
Vdata: Tgnutls_datum_t;
Vkeyid: AnsiString = '';
Vkeyidsize: csize_t;
Vactivation: ttime_t;
Vca_pem_size: csize_t;
Vret: cint;
begin
try
TLSCheckRet(gnutls_x509_privkey_init(@Vkey));
Vdata.data := @Aca_priv_key[1];
Vdata.size := Length(Aca_priv_key);
TLSCheckRet(gnutls_x509_privkey_import(Vkey, @Vdata, GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_crt_init(@Vcrt));
TLSCheckRet(gnutls_x509_crt_set_key(Vcrt, Vkey));
TLSCheckRet(gnutls_x509_crt_set_dn_by_oid(Vcrt, GNUTLS_OID_X520_COMMON_NAME,
0, @Acommon_name[1], Length(Acommon_name)));
TLSCheckRet(gnutls_x509_crt_set_version(Vcrt, 3));
TLSCheckRet(gnutls_x509_crt_set_serial(Vcrt, @Aserial[1], Length(Aserial)));
Vactivation := DateTimeToUnix(Now,False);
TLSCheckRet(gnutls_x509_crt_set_activation_time(Vcrt, Vactivation));
TLSCheckRet(gnutls_x509_crt_set_expiration_time(Vcrt,
Vactivation + (Adays * 86400)));
TLSCheckRet(gnutls_x509_crt_set_ca_status(Vcrt, Ord(True)));
TLSCheckRet(gnutls_x509_crt_set_key_usage(Vcrt, GNUTLS_KEY_KEY_CERT_SIGN));
Vkeyidsize := 0;
Vret := gnutls_x509_crt_get_key_id(Vcrt, GNUTLS_KEYID_USE_SHA1, nil,
@Vkeyidsize);
TLSCheck((Vret <> GNUTLS_E_SHORT_MEMORY_BUFFER) or (Vkeyidsize < 1), Vret);
SetLength(Vkeyid, Pred(Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_get_key_id(Vcrt, GNUTLS_KEYID_USE_SHA1,
@Vkeyid[1], @Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_set_subject_key_id(Vcrt, @Vkeyid[1], Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_sign2(Vcrt, Vcrt, Vkey, GNUTLS_DIG_SHA256, 0));
Aca_pem := '';
Vca_pem_size := CERT_SIZE;
SetLength(Aca_pem, Pred(Vca_pem_size));
TLSCheckRet(gnutls_x509_crt_export(Vcrt, GNUTLS_X509_FMT_PEM, @Aca_pem[1],
@Vca_pem_size));
SetLength(Aca_pem, Pred(Vca_pem_size));
except
gnutls_x509_privkey_deinit(Vkey);
gnutls_x509_crt_deinit(Vcrt);
raise;
end;
end;
procedure TLSGenSrvCert(const Aca_priv_key, Aca_pem, Asrv_priv_key: AnsiString;
out Asrv_pem: AnsiString; const Acommon_name, Aorganization,
Aserial: AnsiString; Adays: Word);
var
Vsrv_key: Tgnutls_x509_privkey_t = nil;
Vca_key: Tgnutls_x509_privkey_t = nil;
Vca_crt: Tgnutls_x509_crt_t = nil;
Vsrv_crt: Tgnutls_x509_crt_t = nil;
Vdata: Tgnutls_datum_t;
Vkeyid: AnsiString = '';
Vkeyidsize: csize_t;
Vactivation: ttime_t;
Vsrv_pem_size: csize_t;
Vret: cint;
begin
try
TLSCheckRet(gnutls_x509_privkey_init(@Vca_key));
Vdata.data := @Aca_priv_key[1];
Vdata.size := Length(Aca_priv_key);
TLSCheckRet(gnutls_x509_privkey_import(Vca_key, @Vdata, GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_privkey_init(@Vsrv_key));
Vdata.data := @Asrv_priv_key[1];
Vdata.size := Length(Asrv_priv_key);
TLSCheckRet(gnutls_x509_privkey_import(Vsrv_key, @Vdata, GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_crt_init(@Vca_crt));
Vdata.data := @Aca_pem[1];
Vdata.size := Length(Aca_pem);
TLSCheckRet(gnutls_x509_crt_import(Vca_crt, @Vdata, GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_crt_init(@Vsrv_crt));
TLSCheckRet(gnutls_x509_crt_set_key(Vsrv_crt, Vsrv_key));
TLSCheckRet(gnutls_x509_crt_set_dn_by_oid(Vsrv_crt,
GNUTLS_OID_X520_COMMON_NAME, 0, @Acommon_name[1], Length(Acommon_name)));
TLSCheckRet(gnutls_x509_crt_set_dn_by_oid(Vsrv_crt,
GNUTLS_OID_X520_ORGANIZATION_NAME, 0, @Aorganization[1],
Length(Aorganization)));
TLSCheckRet(gnutls_x509_crt_set_version(Vsrv_crt, 3));
TLSCheckRet(gnutls_x509_crt_set_serial(Vsrv_crt, @Aserial[1],
Length(Aserial)));
Vactivation := DateTimeToUnix(Now,False);
TLSCheckRet(gnutls_x509_crt_set_activation_time(Vsrv_crt, Vactivation));
TLSCheckRet(gnutls_x509_crt_set_expiration_time(Vsrv_crt,
Vactivation + (Adays * 86400)));
TLSCheckRet(gnutls_x509_crt_set_ca_status(Vsrv_crt, Ord(False)));
TLSCheckRet(gnutls_x509_crt_set_key_purpose_oid(Vsrv_crt,
@GNUTLS_KP_TLS_WWW_SERVER[1], Ord(False)));
Vkeyidsize := 0;
Vret := gnutls_x509_crt_get_subject_key_id(Vca_crt, nil, @Vkeyidsize, nil);
TLSCheck((Vret <> GNUTLS_E_SHORT_MEMORY_BUFFER) or (Vkeyidsize < 1), Vret);
SetLength(Vkeyid, Pred(Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_get_subject_key_id(Vca_crt, @Vkeyid[1],
@Vkeyidsize, nil));
TLSCheckRet(gnutls_x509_crt_set_subject_key_id(Vsrv_crt, @Vkeyid[1],
Vkeyidsize));
Vkeyidsize := 0;
gnutls_x509_crt_get_key_id(Vsrv_crt, GNUTLS_KEYID_USE_SHA1, nil, @Vkeyidsize);
TLSCheck((Vret <> GNUTLS_E_SHORT_MEMORY_BUFFER) or (Vkeyidsize < 1), Vret);
SetLength(Vkeyid, Pred(Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_get_key_id(Vsrv_crt, GNUTLS_KEYID_USE_SHA1,
@Vkeyid[1], @Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_set_authority_key_id(Vsrv_crt,
@Vkeyid[1], Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_sign2(Vsrv_crt, Vca_crt, Vca_key,
GNUTLS_DIG_SHA256, 0));
Vsrv_pem_size := CERT_SIZE;
Asrv_pem := '';
SetLength(Asrv_pem, Pred(Vsrv_pem_size));
TLSCheckRet(gnutls_x509_crt_export(Vsrv_crt, GNUTLS_X509_FMT_PEM,
@Asrv_pem[1], @Vsrv_pem_size));
SetLength(Asrv_pem, Vsrv_pem_size);
except
gnutls_x509_privkey_deinit(Vsrv_key);
gnutls_x509_privkey_deinit(Vca_key);
gnutls_x509_crt_deinit(Vca_crt);
gnutls_x509_crt_deinit(Vsrv_crt);
raise;
end;
end;
procedure TLSGenCliCert(const Aca_priv_key, Aca_pem, Acli_priv_key: AnsiString;
out Acli_pem: AnsiString; const Acommon_name, Aserial: AnsiString;
Adays: Word);
var
Vcli_key: Tgnutls_x509_privkey_t = nil;
Vca_key: Tgnutls_x509_privkey_t = nil;
Vca_crt: Tgnutls_x509_crt_t = nil;
Vcli_crt: Tgnutls_x509_crt_t = nil;
Vdata: Tgnutls_datum_t;
Vkeyid: AnsiString = '';
Vkeyidsize: csize_t;
Vactivation: ttime_t;
Vcli_pem_size: csize_t;
Vret: cint;
begin
try
TLSCheckRet(gnutls_x509_privkey_init(@Vca_key));
Vdata.data := @Aca_priv_key[1];
Vdata.size := Length(Aca_priv_key);
TLSCheckRet(gnutls_x509_privkey_import(Vca_key, @Vdata,
GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_privkey_init(@Vcli_key));
Vdata.data := @Acli_priv_key[1];
Vdata.size := Length(Acli_priv_key);
TLSCheckRet(gnutls_x509_privkey_import(Vcli_key, @Vdata,
GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_crt_init(@Vca_crt));
Vdata.data := @Aca_pem[1];
Vdata.size := Length(Aca_pem);
TLSCheckRet(gnutls_x509_crt_import(Vca_crt, @Vdata, GNUTLS_X509_FMT_PEM));
TLSCheckRet(gnutls_x509_crt_init(@Vcli_crt));
TLSCheckRet(gnutls_x509_crt_set_key(Vcli_crt, Vcli_key));
TLSCheckRet(gnutls_x509_crt_set_dn_by_oid(Vcli_crt,
GNUTLS_OID_X520_COMMON_NAME, 0, @Acommon_name[1], Length(Acommon_name)));
TLSCheckRet(gnutls_x509_crt_set_version(Vcli_crt, 3));
TLSCheckRet(gnutls_x509_crt_set_serial(Vcli_crt, @Aserial[1],
Length(Aserial)));
Vactivation := DateTimeToUnix(Now,False);
TLSCheckRet(gnutls_x509_crt_set_activation_time(Vcli_crt, Vactivation));
TLSCheckRet(gnutls_x509_crt_set_expiration_time(Vcli_crt,
Vactivation + (Adays * 86400)));
TLSCheckRet(gnutls_x509_crt_set_ca_status(Vcli_crt, Ord(False)));
TLSCheckRet(gnutls_x509_crt_set_key_purpose_oid(Vcli_crt,
@GNUTLS_KP_TLS_WWW_CLIENT[1], Ord(False)));
Vkeyidsize := 0;
Vret := gnutls_x509_crt_get_subject_key_id(Vca_crt, nil, @Vkeyidsize, nil);
TLSCheck((Vret <> GNUTLS_E_SHORT_MEMORY_BUFFER) or (Vkeyidsize < 1), Vret);
SetLength(Vkeyid, Pred(Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_get_subject_key_id(Vca_crt, @Vkeyid[1],
@Vkeyidsize, nil));
TLSCheckRet(gnutls_x509_crt_set_subject_key_id(Vcli_crt, @Vkeyid[1],
Vkeyidsize));
Vkeyidsize := 0;
Vret := gnutls_x509_crt_get_key_id(Vca_crt, GNUTLS_KEYID_USE_SHA1,
nil, @Vkeyidsize);
TLSCheck((Vret <> GNUTLS_E_SHORT_MEMORY_BUFFER) or (Vkeyidsize < 1), Vret);
SetLength(Vkeyid, Vkeyidsize);
TLSCheckRet(gnutls_x509_crt_get_key_id(Vca_crt, GNUTLS_KEYID_USE_SHA1,
@Vkeyid[1], @Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_set_authority_key_id(Vcli_crt, @Vkeyid[1],
Vkeyidsize));
TLSCheckRet(gnutls_x509_crt_sign2(Vcli_crt, Vca_crt, Vca_key,
GNUTLS_DIG_SHA256, 0));
Vcli_pem_size := CERT_SIZE;
Acli_pem := '';
SetLength(Acli_pem, Pred(Vcli_pem_size));
TLSCheckRet(gnutls_x509_crt_export(Vcli_crt, GNUTLS_X509_FMT_PEM,
@Acli_pem[1], @Vcli_pem_size));
SetLength(Acli_pem, Vcli_pem_size);
except
gnutls_x509_privkey_deinit(Vcli_key);
gnutls_x509_privkey_deinit(Vca_key);
gnutls_x509_crt_deinit(Vca_crt);
gnutls_x509_crt_deinit(Vcli_crt);
raise;
end;
end;
var
ca_pkey, ca_crt, pkey, crt: AnsiString;
begin
LoadGnuTLS;
Assert(GnuTLSLoaded);
try
WriteLn('Generating ', CA_KEY);
TLSGenPrivKey(ca_pkey);
Save(ca_pkey, CA_KEY);
WriteLn('Done!');
WriteLn('Generating ', CA_PEM);
TLSGenCACert(ca_pkey, ca_crt, 'GnuTLS test CA', '01', 365);
Save(ca_crt, CA_PEM);
WriteLn('Done!');
WriteLn('Generating ', SERVER_KEY);
TLSGenPrivKey(pkey);
Save(pkey, SERVER_KEY);
WriteLn('Done!');
WriteLn('Generating ', SERVER_PEM);
TLSGenSrvCert(ca_pkey, ca_crt, pkey, crt, 'test.gnutls.org',
'GnuTLS test server', '01', 365);
Save(crt, SERVER_PEM);
WriteLn('Done!');
WriteLn('Generating ', CLIENT_KEY);
TLSGenPrivKey(pkey);
Save(pkey, CLIENT_KEY);
WriteLn('Done!');
WriteLn('Generating ', CLIENT_PEM);
TLSGenCliCert(ca_pkey, ca_crt, pkey, crt, 'GnuTLS test client', '01', 365);
Save(crt, CLIENT_PEM);
WriteLn('Done!');
finally
FreeGnuTLS;
end;
end.
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