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/*
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Unix SMB / CIFS implementation .
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Helper functions for applying replicated objects
Copyright ( C ) Stefan Metzmacher < metze @ samba . org > 2007
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Copyright ( C ) Andrew Bartlett < abartlet @ samba . org > 2009
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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 3 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 , see < http : //www.gnu.org/licenses/>.
*/
# include "includes.h"
# include "../lib/util/dlinklist.h"
# include "librpc/gen_ndr/ndr_misc.h"
# include "librpc/gen_ndr/ndr_drsuapi.h"
# include "librpc/gen_ndr/ndr_drsblobs.h"
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# include "zlib.h"
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# include "../libcli/drsuapi/drsuapi.h"
# include "libcli/auth/libcli_auth.h"
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# include "dsdb/samdb/samdb.h"
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# include "lib/crypto/gnutls_helpers.h"
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# include <gnutls/gnutls.h>
# include <gnutls/crypto.h>
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static WERROR drsuapi_decrypt_attribute_value ( TALLOC_CTX * mem_ctx ,
const DATA_BLOB * gensec_skey ,
bool rid_crypt ,
uint32_t rid ,
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const DATA_BLOB * in ,
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DATA_BLOB * out )
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{
DATA_BLOB confounder ;
DATA_BLOB enc_buffer ;
DATA_BLOB dec_buffer ;
uint32_t crc32_given ;
uint32_t crc32_calc ;
DATA_BLOB checked_buffer ;
DATA_BLOB plain_buffer ;
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WERROR result ;
int rc ;
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/*
* users with rid = = 0 should not exist
*/
if ( rid_crypt & & rid = = 0 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
/*
* the first 16 bytes at the beginning are the confounder
* followed by the 4 byte crc32 checksum
*/
if ( in - > length < 20 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
confounder = data_blob_const ( in - > data , 16 ) ;
enc_buffer = data_blob_const ( in - > data + 16 , in - > length - 16 ) ;
/*
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* decrypt with the encryption key , being md5 over the session
* key followed by the confounder . The parameter order to
* samba_gnutls_arcfour_confounded_md5 ( ) matters for this !
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*
* here the gensec session key is used and
* not the dcerpc ncacn_ip_tcp " SystemLibraryDTC " key !
*/
/*
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* reference the encrypted buffer part and
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* decrypt it using the created encryption key using arcfour
*/
dec_buffer = data_blob_const ( enc_buffer . data , enc_buffer . length ) ;
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rc = samba_gnutls_arcfour_confounded_md5 ( gensec_skey ,
& confounder ,
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& dec_buffer ,
SAMBA_GNUTLS_DECRYPT ) ;
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if ( rc < 0 ) {
result = gnutls_error_to_werror ( rc , WERR_INTERNAL_ERROR ) ;
goto out ;
}
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/*
* the first 4 byte are the crc32 checksum
* of the remaining bytes
*/
crc32_given = IVAL ( dec_buffer . data , 0 ) ;
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crc32_calc = crc32 ( 0 , Z_NULL , 0 ) ;
crc32_calc = crc32 ( crc32_calc ,
dec_buffer . data + 4 ,
dec_buffer . length - 4 ) ;
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checked_buffer = data_blob_const ( dec_buffer . data + 4 , dec_buffer . length - 4 ) ;
plain_buffer = data_blob_talloc ( mem_ctx , checked_buffer . data , checked_buffer . length ) ;
W_ERROR_HAVE_NO_MEMORY ( plain_buffer . data ) ;
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if ( crc32_given ! = crc32_calc ) {
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result = W_ERROR ( HRES_ERROR_V ( HRES_SEC_E_DECRYPT_FAILURE ) ) ;
goto out ;
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}
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/*
* The following rid_crypt obfuscation isn ' t session specific
* and not really needed here , because we allways know the rid of the
* user account .
*
* some attributes with this ' additional encryption ' include
* dBCSPwd , unicodePwd , ntPwdHistory , lmPwdHistory
*
* But for the rest of samba it ' s easier when we remove this static
* obfuscation here
*/
if ( rid_crypt ) {
uint32_t i , num_hashes ;
if ( ( checked_buffer . length % 16 ) ! = 0 ) {
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result = WERR_DS_DRA_INVALID_PARAMETER ;
goto out ;
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}
num_hashes = plain_buffer . length / 16 ;
for ( i = 0 ; i < num_hashes ; i + + ) {
uint32_t offset = i * 16 ;
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rc = sam_rid_crypt ( rid , checked_buffer . data + offset ,
plain_buffer . data + offset ,
SAMBA_GNUTLS_DECRYPT ) ;
if ( rc ! = 0 ) {
result = gnutls_error_to_werror ( rc , WERR_INTERNAL_ERROR ) ;
goto out ;
}
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}
}
* out = plain_buffer ;
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result = WERR_OK ;
out :
return result ;
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}
WERROR drsuapi_decrypt_attribute ( TALLOC_CTX * mem_ctx ,
const DATA_BLOB * gensec_skey ,
uint32_t rid ,
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uint32_t dsdb_repl_flags ,
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struct drsuapi_DsReplicaAttribute * attr )
{
WERROR status ;
DATA_BLOB * enc_data ;
DATA_BLOB plain_data ;
bool rid_crypt = false ;
if ( attr - > value_ctr . num_values = = 0 ) {
return WERR_OK ;
}
switch ( attr - > attid ) {
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case DRSUAPI_ATTID_dBCSPwd :
case DRSUAPI_ATTID_unicodePwd :
case DRSUAPI_ATTID_ntPwdHistory :
case DRSUAPI_ATTID_lmPwdHistory :
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rid_crypt = true ;
break ;
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case DRSUAPI_ATTID_supplementalCredentials :
case DRSUAPI_ATTID_priorValue :
case DRSUAPI_ATTID_currentValue :
case DRSUAPI_ATTID_trustAuthOutgoing :
case DRSUAPI_ATTID_trustAuthIncoming :
case DRSUAPI_ATTID_initialAuthOutgoing :
case DRSUAPI_ATTID_initialAuthIncoming :
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break ;
default :
return WERR_OK ;
}
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if ( dsdb_repl_flags & DSDB_REPL_FLAG_EXPECT_NO_SECRETS ) {
return WERR_TOO_MANY_SECRETS ;
}
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if ( attr - > value_ctr . num_values > 1 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
if ( ! attr - > value_ctr . values [ 0 ] . blob ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
enc_data = attr - > value_ctr . values [ 0 ] . blob ;
status = drsuapi_decrypt_attribute_value ( mem_ctx ,
gensec_skey ,
rid_crypt ,
rid ,
enc_data ,
& plain_data ) ;
W_ERROR_NOT_OK_RETURN ( status ) ;
talloc_free ( attr - > value_ctr . values [ 0 ] . blob - > data ) ;
* attr - > value_ctr . values [ 0 ] . blob = plain_data ;
return WERR_OK ;
}
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static WERROR drsuapi_encrypt_attribute_value ( TALLOC_CTX * mem_ctx ,
const DATA_BLOB * gensec_skey ,
bool rid_crypt ,
uint32_t rid ,
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const DATA_BLOB * in ,
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DATA_BLOB * out )
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{
DATA_BLOB rid_crypt_out = data_blob ( NULL , 0 ) ;
DATA_BLOB confounder ;
DATA_BLOB enc_buffer ;
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DATA_BLOB to_encrypt ;
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uint32_t crc32_calc ;
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WERROR result ;
int rc ;
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/*
* users with rid = = 0 should not exist
*/
if ( rid_crypt & & rid = = 0 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
/*
* The following rid_crypt obfuscation isn ' t session specific
* and not really needed here , because we allways know the rid of the
* user account .
*
* some attributes with this ' additional encryption ' include
* dBCSPwd , unicodePwd , ntPwdHistory , lmPwdHistory
*
* But for the rest of samba it ' s easier when we remove this static
* obfuscation here
*/
if ( rid_crypt ) {
uint32_t i , num_hashes ;
rid_crypt_out = data_blob_talloc ( mem_ctx , in - > data , in - > length ) ;
W_ERROR_HAVE_NO_MEMORY ( rid_crypt_out . data ) ;
if ( ( rid_crypt_out . length % 16 ) ! = 0 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
num_hashes = rid_crypt_out . length / 16 ;
for ( i = 0 ; i < num_hashes ; i + + ) {
uint32_t offset = i * 16 ;
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rc = sam_rid_crypt ( rid , in - > data + offset ,
rid_crypt_out . data + offset ,
SAMBA_GNUTLS_ENCRYPT ) ;
if ( rc ! = 0 ) {
result = gnutls_error_to_werror ( rc , WERR_INTERNAL_ERROR ) ;
goto out ;
}
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}
in = & rid_crypt_out ;
}
/*
* the first 16 bytes at the beginning are the confounder
* followed by the 4 byte crc32 checksum
*/
enc_buffer = data_blob_talloc ( mem_ctx , NULL , in - > length + 20 ) ;
if ( ! enc_buffer . data ) {
talloc_free ( rid_crypt_out . data ) ;
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return WERR_NOT_ENOUGH_MEMORY ;
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} ;
confounder = data_blob_const ( enc_buffer . data , 16 ) ;
generate_random_buffer ( confounder . data , confounder . length ) ;
/*
* the first 4 byte are the crc32 checksum
* of the remaining bytes
*/
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crc32_calc = crc32 ( 0 , Z_NULL , 0 ) ;
crc32_calc = crc32 ( crc32_calc , in - > data , in - > length ) ;
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SIVAL ( enc_buffer . data , 16 , crc32_calc ) ;
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/*
* copy the plain buffer part and
* encrypt it using the created encryption key using arcfour
*/
memcpy ( enc_buffer . data + 20 , in - > data , in - > length ) ;
talloc_free ( rid_crypt_out . data ) ;
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to_encrypt = data_blob_const ( enc_buffer . data + 16 ,
enc_buffer . length - 16 ) ;
/*
* encrypt with the encryption key , being md5 over the session
* key followed by the confounder . The parameter order to
* samba_gnutls_arcfour_confounded_md5 ( ) matters for this !
*
* here the gensec session key is used and
* not the dcerpc ncacn_ip_tcp " SystemLibraryDTC " key !
*/
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rc = samba_gnutls_arcfour_confounded_md5 ( gensec_skey ,
& confounder ,
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& to_encrypt ,
SAMBA_GNUTLS_ENCRYPT ) ;
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if ( rc < 0 ) {
result = gnutls_error_to_werror ( rc , WERR_INTERNAL_ERROR ) ;
goto out ;
}
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* out = enc_buffer ;
result = WERR_OK ;
out :
return result ;
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}
/*
encrypt a DRSUAPI attribute ready for sending over the wire
Only some attribute types are encrypted
*/
WERROR drsuapi_encrypt_attribute ( TALLOC_CTX * mem_ctx ,
const DATA_BLOB * gensec_skey ,
uint32_t rid ,
struct drsuapi_DsReplicaAttribute * attr )
{
WERROR status ;
DATA_BLOB * plain_data ;
DATA_BLOB enc_data ;
bool rid_crypt = false ;
if ( attr - > value_ctr . num_values = = 0 ) {
return WERR_OK ;
}
switch ( attr - > attid ) {
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case DRSUAPI_ATTID_dBCSPwd :
case DRSUAPI_ATTID_unicodePwd :
case DRSUAPI_ATTID_ntPwdHistory :
case DRSUAPI_ATTID_lmPwdHistory :
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rid_crypt = true ;
break ;
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case DRSUAPI_ATTID_supplementalCredentials :
case DRSUAPI_ATTID_priorValue :
case DRSUAPI_ATTID_currentValue :
case DRSUAPI_ATTID_trustAuthOutgoing :
case DRSUAPI_ATTID_trustAuthIncoming :
case DRSUAPI_ATTID_initialAuthOutgoing :
case DRSUAPI_ATTID_initialAuthIncoming :
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break ;
default :
return WERR_OK ;
}
if ( attr - > value_ctr . num_values > 1 ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
if ( ! attr - > value_ctr . values [ 0 ] . blob ) {
return WERR_DS_DRA_INVALID_PARAMETER ;
}
plain_data = attr - > value_ctr . values [ 0 ] . blob ;
status = drsuapi_encrypt_attribute_value ( mem_ctx ,
gensec_skey ,
rid_crypt ,
rid ,
plain_data ,
& enc_data ) ;
W_ERROR_NOT_OK_RETURN ( status ) ;
talloc_free ( attr - > value_ctr . values [ 0 ] . blob - > data ) ;
* attr - > value_ctr . values [ 0 ] . blob = enc_data ;
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return WERR_OK ;
}