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|
/*
Unix SMB/CIFS implementation.
Validate the krb5 pac generation routines
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/kerberos.h"
#include "auth/auth.h"
#include "auth/kerberos/kerberos.h"
#include "librpc/gen_ndr/ndr_krb5pac.h"
#include "librpc/gen_ndr/ndr_samr.h"
static BOOL torture_pac_self_check(void)
{
NTSTATUS nt_status;
TALLOC_CTX *mem_ctx = talloc_named(NULL, 0, "PAC self check");
DATA_BLOB tmp_blob;
struct PAC_DATA *pac_data;
struct PAC_LOGON_INFO *logon_info;
union netr_Validation validation;
/* Generate a nice, arbitary keyblock */
uint8_t server_bytes[16];
uint8_t krbtgt_bytes[16];
krb5_keyblock server_keyblock;
krb5_keyblock krbtgt_keyblock;
krb5_error_code ret;
struct smb_krb5_context *smb_krb5_context;
struct auth_serversupplied_info *server_info;
struct auth_serversupplied_info *server_info_out;
ret = smb_krb5_init_context(mem_ctx, &smb_krb5_context);
if (ret) {
talloc_free(mem_ctx);
return False;
}
generate_random_buffer(server_bytes, 16);
generate_random_buffer(krbtgt_bytes, 16);
ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
ENCTYPE_ARCFOUR_HMAC,
server_bytes, sizeof(server_bytes),
&server_keyblock);
if (ret) {
printf("Server Keyblock encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx));
talloc_free(mem_ctx);
return False;
}
ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
ENCTYPE_ARCFOUR_HMAC,
krbtgt_bytes, sizeof(krbtgt_bytes),
&krbtgt_keyblock);
if (ret) {
printf("KRBTGT Keyblock encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
}
/* We need an input, and this one requires no underlying database */
nt_status = auth_anonymous_server_info(mem_ctx, &server_info);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
talloc_free(mem_ctx);
return False;
}
/* OK, go ahead and make a PAC */
ret = kerberos_create_pac(mem_ctx, server_info,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock,
time(NULL),
&tmp_blob);
if (ret) {
printf("PAC encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
}
dump_data(10,tmp_blob.data,tmp_blob.length);
/* Now check that we can read it back */
nt_status = kerberos_decode_pac(mem_ctx, &pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
DEBUG(1, ("PAC decoding failed: %s\n",
nt_errstr(nt_status)));
talloc_free(mem_ctx);
return False;
}
/* Now check that we can read it back */
nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
printf("PAC decoding (for logon info) failed: %s\n",
nt_errstr(nt_status));
talloc_free(mem_ctx);
return False;
}
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
validation.sam3 = &logon_info->info3;
nt_status = make_server_info_netlogon_validation(mem_ctx,
"",
3, &validation,
&server_info_out);
if (!NT_STATUS_IS_OK(nt_status)) {
printf("PAC decoding (make server info) failed: %s\n",
nt_errstr(nt_status));
talloc_free(mem_ctx);
return False;
}
if (!dom_sid_equal(server_info->account_sid,
server_info_out->account_sid)) {
printf("PAC Decode resulted in *different* domain SID: %s != %s\n",
dom_sid_string(mem_ctx, server_info->account_sid),
dom_sid_string(mem_ctx, server_info_out->account_sid));
talloc_free(mem_ctx);
return False;
}
talloc_free(mem_ctx);
return True;
}
/* This is the PAC generated on my test network, by my test Win2k3 server.
-- abartlet 2005-07-04
*/
static const uint8_t saved_pac[] = {
0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xd8, 0x01, 0x00, 0x00,
0x48, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00,
0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
0x40, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
0x58, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x10, 0x08, 0x00, 0xcc, 0xcc, 0xcc, 0xcc,
0xc8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x30, 0xdf, 0xa6, 0xcb,
0x4f, 0x7d, 0xc5, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x7f, 0xc0, 0x3c, 0x4e, 0x59, 0x62, 0x73, 0xc5, 0x01, 0xc0, 0x3c, 0x4e, 0x59,
0x62, 0x73, 0xc5, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0x16, 0x00, 0x16, 0x00,
0x04, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x0c, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x14, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x02, 0x00, 0x65, 0x00, 0x00, 0x00,
0xed, 0x03, 0x00, 0x00, 0x04, 0x02, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x02, 0x00,
0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x16, 0x00, 0x20, 0x00, 0x02, 0x00, 0x16, 0x00, 0x18, 0x00,
0x24, 0x00, 0x02, 0x00, 0x28, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x2c, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00,
0x57, 0x00, 0x32, 0x00, 0x30, 0x00, 0x30, 0x00, 0x33, 0x00, 0x46, 0x00, 0x49, 0x00, 0x4e, 0x00,
0x41, 0x00, 0x4c, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x04, 0x02, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00,
0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x57, 0x00, 0x32, 0x00,
0x30, 0x00, 0x30, 0x00, 0x33, 0x00, 0x46, 0x00, 0x49, 0x00, 0x4e, 0x00, 0x41, 0x00, 0x4c, 0x00,
0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x57, 0x00, 0x49, 0x00,
0x4e, 0x00, 0x32, 0x00, 0x4b, 0x00, 0x33, 0x00, 0x54, 0x00, 0x48, 0x00, 0x49, 0x00, 0x4e, 0x00,
0x4b, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x01, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05,
0x15, 0x00, 0x00, 0x00, 0x11, 0x2f, 0xaf, 0xb5, 0x90, 0x04, 0x1b, 0xec, 0x50, 0x3b, 0xec, 0xdc,
0x01, 0x00, 0x00, 0x00, 0x30, 0x00, 0x02, 0x00, 0x07, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x66, 0x28, 0xea, 0x37, 0x80, 0xc5, 0x01, 0x16, 0x00, 0x77, 0x00, 0x32, 0x00, 0x30, 0x00,
0x30, 0x00, 0x33, 0x00, 0x66, 0x00, 0x69, 0x00, 0x6e, 0x00, 0x61, 0x00, 0x6c, 0x00, 0x24, 0x00,
0x76, 0xff, 0xff, 0xff, 0x37, 0xd5, 0xb0, 0xf7, 0x24, 0xf0, 0xd6, 0xd4, 0xec, 0x09, 0x86, 0x5a,
0xa0, 0xe8, 0xc3, 0xa9, 0x00, 0x00, 0x00, 0x00, 0x76, 0xff, 0xff, 0xff, 0xb4, 0xd8, 0xb8, 0xfe,
0x83, 0xb3, 0x13, 0x3f, 0xfc, 0x5c, 0x41, 0xad, 0xe2, 0x64, 0x83, 0xe0, 0x00, 0x00, 0x00, 0x00
};
/* Check with a known 'well formed' PAC, from my test server */
static BOOL torture_pac_saved_check(void)
{
NTSTATUS nt_status;
TALLOC_CTX *mem_ctx = talloc_named(NULL, 0, "PAC saved check");
DATA_BLOB tmp_blob, validate_blob;
struct PAC_DATA *pac_data;
struct PAC_LOGON_INFO *logon_info;
union netr_Validation validation;
const char *pac_file, *pac_kdc_key, *pac_member_key;
struct auth_serversupplied_info *server_info_out;
krb5_keyblock server_keyblock;
krb5_keyblock krbtgt_keyblock;
struct samr_Password *krbtgt_bytes, *krbsrv_bytes;
krb5_error_code ret;
struct smb_krb5_context *smb_krb5_context;
ret = smb_krb5_init_context(mem_ctx, &smb_krb5_context);
if (ret) {
talloc_free(mem_ctx);
return False;
}
pac_kdc_key = lp_parm_string(-1,"torture","pac_kdc_key");
if (pac_kdc_key == NULL) {
pac_kdc_key = "B286757148AF7FD252C53603A150B7E7";
}
pac_member_key = lp_parm_string(-1,"torture","pac_member_key");
if (pac_member_key == NULL) {
pac_member_key = "D217FAEAE5E6B5F95CCC94077AB8A5FC";
}
printf("Using pac_kdc_key '%s'\n", pac_kdc_key);
printf("Using pac_member_key '%s'\n", pac_member_key);
/* The krbtgt key in use when the above PAC was generated.
* This is an arcfour-hmac-md5 key, extracted with our 'net
* samdump' tool. */
krbtgt_bytes = smbpasswd_gethexpwd(mem_ctx, pac_kdc_key);
if (!krbtgt_bytes) {
DEBUG(0, ("Could not interpret krbtgt key"));
talloc_free(mem_ctx);
return False;
}
krbsrv_bytes = smbpasswd_gethexpwd(mem_ctx, pac_member_key);
if (!krbsrv_bytes) {
DEBUG(0, ("Could not interpret krbsrv key"));
talloc_free(mem_ctx);
return False;
}
ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
ENCTYPE_ARCFOUR_HMAC,
krbsrv_bytes->hash, sizeof(krbsrv_bytes->hash),
&server_keyblock);
if (ret) {
DEBUG(1, ("Server Keyblock encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
talloc_free(mem_ctx);
return False;
}
ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
ENCTYPE_ARCFOUR_HMAC,
krbtgt_bytes->hash, sizeof(krbtgt_bytes->hash),
&krbtgt_keyblock);
if (ret) {
DEBUG(1, ("Server Keyblock encoding failed: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
}
pac_file = lp_parm_string(-1,"torture","pac_file");
if (pac_file) {
tmp_blob.data = file_load(pac_file, &tmp_blob.length, mem_ctx);
printf("Loaded pac of size %d from %s\n", tmp_blob.length, pac_file);
} else {
tmp_blob = data_blob(saved_pac, sizeof(saved_pac));
file_save("x.dat", tmp_blob.data, tmp_blob.length);
}
dump_data(10,tmp_blob.data,tmp_blob.length);
/* Decode and verify the signaure on the PAC */
nt_status = kerberos_decode_pac(mem_ctx, &pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("PAC decoding failed: %s\n",
nt_errstr(nt_status)));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
}
/* Parse the PAC again, for the logon info this time */
nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
printf("PAC decoding (for logon info) failed: %s\n",
nt_errstr(nt_status));
talloc_free(mem_ctx);
return False;
}
validation.sam3 = &logon_info->info3;
nt_status = make_server_info_netlogon_validation(mem_ctx,
"",
3, &validation,
&server_info_out);
if (!NT_STATUS_IS_OK(nt_status)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
printf("PAC decoding (make server info) failed: %s\n",
nt_errstr(nt_status));
talloc_free(mem_ctx);
return False;
}
if (!pac_file &&
!dom_sid_equal(dom_sid_parse_talloc(mem_ctx, "S-1-5-21-3048156945-3961193616-3706469200-1005"),
server_info_out->account_sid)) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
printf("PAC Decode resulted in *different* domain SID: %s != %s\n",
"S-1-5-21-3048156945-3961193616-3706469200-1005",
dom_sid_string(mem_ctx, server_info_out->account_sid));
talloc_free(mem_ctx);
return False;
}
ret = kerberos_encode_pac(mem_ctx,
pac_data,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock,
&validate_blob);
if (ret != 0) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
DEBUG(0, ("PAC push failed\n"));
talloc_free(mem_ctx);
return False;
}
dump_data(10,validate_blob.data,validate_blob.length);
/* compare both the length and the data bytes after a
* pull/push cycle. This ensures we use the exact same
* pointer, padding etc algorithms as win2k3.
*/
if (tmp_blob.length != validate_blob.length) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
DEBUG(0, ("PAC push failed: original buffer length[%u] != created buffer length[%u]\n",
(unsigned)tmp_blob.length, (unsigned)validate_blob.length));
talloc_free(mem_ctx);
return False;
}
if (memcmp(tmp_blob.data, validate_blob.data, tmp_blob.length) != 0) {
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
DEBUG(0, ("PAC push failed: length[%u] matches, but data does not\n",
(unsigned)tmp_blob.length));
talloc_free(mem_ctx);
return False;
}
/* Finally... Bugger up the signature, and check we fail the checksum */
tmp_blob.data[tmp_blob.length - 2]++;
nt_status = kerberos_decode_pac(mem_ctx, &pac_data,
tmp_blob,
smb_krb5_context->krb5_context,
&krbtgt_keyblock,
&server_keyblock);
if (NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("PAC decoding DID NOT fail on broken checksum\n"));
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return False;
}
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&krbtgt_keyblock);
krb5_free_keyblock_contents(smb_krb5_context->krb5_context,
&server_keyblock);
talloc_free(mem_ctx);
return True;
}
BOOL torture_pac(void)
{
BOOL ret = True;
ret &= torture_pac_self_check();
ret &= torture_pac_saved_check();
return ret;
}
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