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/*
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Unix SMB / CIFS implementation .
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krb5 set password implementation
Copyright ( C ) Andrew Tridgell 2001
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Copyright ( C ) Remus Koos 2001 ( remuskoos @ yahoo . com )
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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
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the Free Software Foundation ; either version 3 of the License , or
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( 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
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along with this program . If not , see < http : //www.gnu.org/licenses/>.
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*/
# include "includes.h"
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# include "smb_krb5.h"
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# include "libads/kerberos_proto.h"
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# include "../lib/util/asn1.h"
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# ifdef HAVE_KRB5
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/* Those are defined by kerberos-set-passwd-02.txt and are probably
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* not supported by M $ implementation */
# define KRB5_KPASSWD_POLICY_REJECT 8
# define KRB5_KPASSWD_BAD_PRINCIPAL 9
# define KRB5_KPASSWD_ETYPE_NOSUPP 10
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/*
* we ' ve got to be able to distinguish KRB_ERRORs from other
* requests - valid response for CHPW v2 replies .
*/
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static krb5_error_code kpasswd_err_to_krb5_err ( krb5_error_code res_code )
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{
switch ( res_code ) {
case KRB5_KPASSWD_ACCESSDENIED :
return KRB5KDC_ERR_BADOPTION ;
case KRB5_KPASSWD_INITIAL_FLAG_NEEDED :
return KRB5KDC_ERR_BADOPTION ;
/* return KV5M_ALT_METHOD; MIT-only define */
case KRB5_KPASSWD_ETYPE_NOSUPP :
return KRB5KDC_ERR_ETYPE_NOSUPP ;
case KRB5_KPASSWD_BAD_PRINCIPAL :
return KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN ;
case KRB5_KPASSWD_POLICY_REJECT :
case KRB5_KPASSWD_SOFTERROR :
return KRB5KDC_ERR_POLICY ;
default :
return KRB5KRB_ERR_GENERIC ;
}
}
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ADS_STATUS ads_krb5_set_password ( const char * kdc_host , const char * principal ,
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const char * newpw , int time_offset )
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{
ADS_STATUS aret ;
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krb5_error_code ret = 0 ;
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krb5_context context = NULL ;
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krb5_principal princ = NULL ;
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krb5_ccache ccache = NULL ;
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int result_code ;
krb5_data result_code_string = { 0 } ;
krb5_data result_string = { 0 } ;
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initialize_krb5_error_table ( ) ;
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ret = krb5_init_context ( & context ) ;
if ( ret ) {
DEBUG ( 1 , ( " Failed to init krb5 context (%s) \n " , error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
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if ( principal ) {
ret = smb_krb5_parse_name ( context , principal , & princ ) ;
if ( ret ) {
krb5_free_context ( context ) ;
DEBUG ( 1 , ( " Failed to parse %s (%s) \n " , principal ,
error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
}
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if ( time_offset ! = 0 ) {
krb5_set_real_time ( context , time ( NULL ) + time_offset , 0 ) ;
}
ret = krb5_cc_default ( context , & ccache ) ;
if ( ret ) {
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krb5_free_principal ( context , princ ) ;
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krb5_free_context ( context ) ;
DEBUG ( 1 , ( " Failed to get default creds (%s) \n " , error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
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ret = krb5_set_password_using_ccache ( context , ccache , newpw , princ ,
& result_code ,
& result_code_string ,
& result_string ) ;
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if ( ret ) {
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DEBUG ( 1 , ( " krb5_set_password failed (%s) \n " , error_message ( ret ) ) ) ;
aret = ADS_ERROR_KRB5 ( ret ) ;
goto done ;
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}
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if ( result_code ! = KRB5_KPASSWD_SUCCESS ) {
ret = kpasswd_err_to_krb5_err ( result_code ) ;
DEBUG ( 1 , ( " krb5_set_password failed (%s) \n " , error_message ( ret ) ) ) ;
aret = ADS_ERROR_KRB5 ( ret ) ;
goto done ;
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}
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aret = ADS_SUCCESS ;
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done :
kerberos_free_data_contents ( context , & result_code_string ) ;
kerberos_free_data_contents ( context , & result_string ) ;
krb5_free_principal ( context , princ ) ;
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krb5_cc_close ( context , ccache ) ;
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krb5_free_context ( context ) ;
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return aret ;
}
/*
we use a prompter to avoid a crash bug in the kerberos libs when
dealing with empty passwords
this prompter is just a string copy . . .
*/
static krb5_error_code
kerb_prompter ( krb5_context ctx , void * data ,
const char * name ,
const char * banner ,
int num_prompts ,
krb5_prompt prompts [ ] )
{
if ( num_prompts = = 0 ) return 0 ;
memset ( prompts [ 0 ] . reply - > data , 0 , prompts [ 0 ] . reply - > length ) ;
if ( prompts [ 0 ] . reply - > length > 0 ) {
if ( data ) {
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strncpy ( ( char * ) prompts [ 0 ] . reply - > data ,
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( const char * ) data ,
prompts [ 0 ] . reply - > length - 1 ) ;
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prompts [ 0 ] . reply - > length = strlen ( ( const char * ) prompts [ 0 ] . reply - > data ) ;
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} else {
prompts [ 0 ] . reply - > length = 0 ;
}
}
return 0 ;
}
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static ADS_STATUS ads_krb5_chg_password ( const char * kdc_host ,
const char * principal ,
const char * oldpw ,
const char * newpw ,
int time_offset )
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{
ADS_STATUS aret ;
krb5_error_code ret ;
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krb5_context context = NULL ;
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krb5_principal princ ;
krb5_get_init_creds_opt opts ;
krb5_creds creds ;
char * chpw_princ = NULL , * password ;
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const char * realm = NULL ;
int result_code ;
krb5_data result_code_string = { 0 } ;
krb5_data result_string = { 0 } ;
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initialize_krb5_error_table ( ) ;
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ret = krb5_init_context ( & context ) ;
if ( ret ) {
DEBUG ( 1 , ( " Failed to init krb5 context (%s) \n " , error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
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if ( ( ret = smb_krb5_parse_name ( context , principal ,
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& princ ) ) ) {
krb5_free_context ( context ) ;
DEBUG ( 1 , ( " Failed to parse %s (%s) \n " , principal , error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
krb5_get_init_creds_opt_init ( & opts ) ;
krb5_get_init_creds_opt_set_tkt_life ( & opts , 5 * 60 ) ;
krb5_get_init_creds_opt_set_renew_life ( & opts , 0 ) ;
krb5_get_init_creds_opt_set_forwardable ( & opts , 0 ) ;
krb5_get_init_creds_opt_set_proxiable ( & opts , 0 ) ;
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realm = smb_krb5_principal_get_realm ( context , princ ) ;
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/* We have to obtain an INITIAL changepw ticket for changing password */
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if ( asprintf ( & chpw_princ , " kadmin/changepw@%s " , realm ) = = - 1 ) {
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krb5_free_context ( context ) ;
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free ( realm ) ;
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DEBUG ( 1 , ( " ads_krb5_chg_password: asprintf fail \n " ) ) ;
return ADS_ERROR_NT ( NT_STATUS_NO_MEMORY ) ;
}
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free ( realm ) ;
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password = SMB_STRDUP ( oldpw ) ;
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ret = krb5_get_init_creds_password ( context , & creds , princ , password ,
kerb_prompter , NULL ,
0 , chpw_princ , & opts ) ;
SAFE_FREE ( chpw_princ ) ;
SAFE_FREE ( password ) ;
if ( ret ) {
if ( ret = = KRB5KRB_AP_ERR_BAD_INTEGRITY )
DEBUG ( 1 , ( " Password incorrect while getting initial ticket " ) ) ;
else
DEBUG ( 1 , ( " krb5_get_init_creds_password failed (%s) \n " , error_message ( ret ) ) ) ;
krb5_free_principal ( context , princ ) ;
krb5_free_context ( context ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
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ret = krb5_change_password ( context , & creds , newpw , & result_code ,
& result_code_string , & result_string ) ;
if ( ret ) {
DEBUG ( 1 , ( " krb5_change_password failed (%s) \n " , error_message ( ret ) ) ) ;
aret = ADS_ERROR_KRB5 ( ret ) ;
goto done ;
}
if ( result_code ! = KRB5_KPASSWD_SUCCESS ) {
ret = kpasswd_err_to_krb5_err ( result_code ) ;
DEBUG ( 1 , ( " krb5_change_password failed (%s) \n " , error_message ( ret ) ) ) ;
aret = ADS_ERROR_KRB5 ( ret ) ;
goto done ;
}
aret = ADS_SUCCESS ;
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done :
kerberos_free_data_contents ( context , & result_code_string ) ;
kerberos_free_data_contents ( context , & result_string ) ;
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krb5_free_principal ( context , princ ) ;
krb5_free_context ( context ) ;
return aret ;
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}
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ADS_STATUS kerberos_set_password ( const char * kpasswd_server ,
const char * auth_principal , const char * auth_password ,
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const char * target_principal , const char * new_password ,
int time_offset )
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{
int ret ;
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if ( ( ret = kerberos_kinit_password ( auth_principal , auth_password , time_offset , NULL ) ) ) {
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DEBUG ( 1 , ( " Failed kinit for principal %s (%s) \n " , auth_principal , error_message ( ret ) ) ) ;
return ADS_ERROR_KRB5 ( ret ) ;
}
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if ( ! strcmp ( auth_principal , target_principal ) )
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return ads_krb5_chg_password ( kpasswd_server , target_principal ,
auth_password , new_password , time_offset ) ;
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else
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return ads_krb5_set_password ( kpasswd_server , target_principal ,
new_password , time_offset ) ;
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}
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# endif