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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <krb5.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <k5-platform.h>
#define TKTTIMELEFT 60*10 /* ten minutes */
static int verify_creds()
{
krb5_context kcontext;
krb5_ccache ccache;
krb5_error_code kres;
kres = krb5_init_context(&kcontext);
if( kres == 0 )
{
kres = krb5_cc_default( kcontext, &ccache );
if( kres == 0 )
{
krb5_principal user_princ;
kres = krb5_cc_get_principal( kcontext, ccache, &user_princ );
if( kres == 0 )
krb5_free_principal( kcontext, user_princ );
krb5_cc_close( kcontext, ccache );
}
krb5_free_context(kcontext);
}
return kres;
}
static void get_init_creds_opt_init( krb5_get_init_creds_opt *outOptions )
{
krb5_preauthtype preauth[] = { KRB5_PADATA_ENC_TIMESTAMP };
krb5_enctype etypes[] = {ENCTYPE_DES_CBC_MD5, ENCTYPE_DES_CBC_CRC};
krb5_get_init_creds_opt_set_address_list(outOptions, NULL);
krb5_get_init_creds_opt_set_etype_list( outOptions, etypes, sizeof(etypes)/sizeof(krb5_enctype) );
krb5_get_init_creds_opt_set_preauth_list(outOptions, preauth, sizeof(preauth)/sizeof(krb5_preauthtype) );
}
typedef void * kbrccache_t;
#define CCACHE_PREFIX_DEFAULT "MEMORY:C_"
static kbrccache_t userinitcontext(
const char * user, const char * domain, const char * passwd, const char * cachename, int initialize,
int * outError )
{
krb5_context kcontext = 0;
krb5_ccache kcache = 0;
krb5_creds kcreds;
krb5_principal kme = 0;
krb5_error_code kres;
char * pPass = strdup( passwd );
char * pName = NULL;
char * pCacheName = NULL;
int numCreds = 0;
memset( &kcreds, 0, sizeof(kcreds) );
kres = krb5_init_context( &kcontext );
if( kres )
goto return_error;
if( domain )
kres = krb5_build_principal( kcontext, &kme, strlen(domain), domain, user, (char *) 0 );
else
kres = krb5_parse_name( kcontext, user, &kme );
if( kres )
goto fail;
krb5_unparse_name( kcontext, kme, &pName );
if( cachename )
{
if (asprintf(&pCacheName, "%s%s", cachename, pName) < 0)
{
kres = KRB5_CC_NOMEM;
goto fail;
}
kres = krb5_cc_resolve( kcontext, pCacheName, &kcache );
if( kres )
{
kres = krb5_cc_resolve( kcontext, CCACHE_PREFIX_DEFAULT, &kcache );
if( kres == 0 )
pCacheName = strdup(CCACHE_PREFIX_DEFAULT);
}
}
else
{
kres = krb5_cc_default( kcontext, &kcache );
pCacheName = strdup( krb5_cc_get_name( kcontext, kcache ) );
}
if( kres )
{
krb5_free_context(kcontext);
goto return_error;
}
if( initialize )
krb5_cc_initialize( kcontext, kcache, kme );
if( kres == 0 && user && passwd )
{
long timeneeded = time(0L) +TKTTIMELEFT;
int have_credentials = 0;
krb5_cc_cursor cc_curs = NULL;
numCreds = 0;
if( (kres=krb5_cc_start_seq_get(kcontext, kcache, &cc_curs)) >= 0 )
{
while( (kres=krb5_cc_next_cred(kcontext, kcache, &cc_curs, &kcreds))== 0)
{
numCreds++;
if( krb5_principal_compare( kcontext, kme, kcreds.client ) )
{
if( kcreds.ticket_flags & TKT_FLG_INITIAL && kcreds.times.endtime>timeneeded )
have_credentials = 1;
}
krb5_free_cred_contents( kcontext, &kcreds );
if( have_credentials )
break;
}
krb5_cc_end_seq_get( kcontext, kcache, &cc_curs );
}
else
{
const char * errmsg = error_message(kres);
fprintf( stderr, "%s user init(%s): %s\n", "setpass", pName, errmsg );
}
if( kres != 0 || have_credentials == 0 )
{
krb5_get_init_creds_opt *options = NULL;
kres = krb5_get_init_creds_opt_alloc(kcontext, &options);
if ( kres == 0 )
{
get_init_creds_opt_init(options);
/*
** no valid credentials - get new ones
*/
kres = krb5_get_init_creds_password( kcontext, &kcreds, kme, pPass,
NULL /*prompter*/,
NULL /*data*/,
0 /*starttime*/,
0 /*in_tkt_service*/,
options /*options*/ );
}
if( kres == 0 )
{
if( numCreds <= 0 )
kres = krb5_cc_initialize( kcontext, kcache, kme );
if( kres == 0 )
kres = krb5_cc_store_cred( kcontext, kcache, &kcreds );
if( kres == 0 )
have_credentials = 1;
}
krb5_get_init_creds_opt_free(kcontext, options);
}
#ifdef NOTUSED
if( have_credentials )
{
int mstat;
kres = gss_krb5_ccache_name( &mstat, pCacheName, NULL );
if( getenv( ENV_DEBUG_LDAPKERB ) )
fprintf( stderr, "gss credentials cache set to %s(%d)\n", pCacheName, kres );
}
#endif
krb5_cc_close( kcontext, kcache );
}
fail:
if( kres )
{
const char * errmsg = error_message(kres);
fprintf( stderr, "%s user init(%s): %s\n", "setpass", pName, errmsg );
}
krb5_free_principal( kcontext, kme );
krb5_free_cred_contents( kcontext, &kcreds );
if( pName )
free( pName );
free(pPass);
krb5_free_context(kcontext);
return_error:
if( kres )
{
if( pCacheName )
{
free(pCacheName);
pCacheName = NULL;
}
}
if( outError )
*outError = kres;
return pCacheName;
}
static int init_creds()
{
char user[512];
char * password = NULL;
int result;
user[0] = 0;
result = -1;
for(;;)
{
while( user[0] == 0 )
{
int userlen;
printf( "Username: ");
fflush(stdout);
if( fgets( user, sizeof(user), stdin ) == NULL )
return -1;
userlen = strlen( user);
if( userlen < 2 )
continue;
user[userlen-1] = 0; /* get rid of the newline */
break;
}
{
kbrccache_t usercontext;
password = getpass( "Password: ");
if( ! password )
return -1;
result = 0;
usercontext = userinitcontext( user, NULL, password, NULL, 1, &result );
if( usercontext )
break;
}
}
return result;
}
int main( int argc, char ** argv )
{
char * new_password = NULL;
char * new_password2;
krb5_context kcontext;
krb5_error_code kerr;
krb5_principal target_principal;
if( argc < 2 )
{
fprintf( stderr, "Usage: setpass user@REALM\n");
exit(1);
}
/*
** verify credentials -
*/
if( verify_creds() )
init_creds();
if( verify_creds() )
{
fprintf( stderr, "No user credentials available\n");
exit(1);
}
/*
** check the principal name -
*/
krb5_init_context(&kcontext);
kerr = krb5_parse_name( kcontext, argv[1], &target_principal );
{
char * pname = NULL;
kerr = krb5_unparse_name( kcontext, target_principal, &pname );
printf( "Changing password for %s:\n", pname);
fflush( stdout );
free( pname );
}
/*
** get the new password -
*/
while( !new_password )
{
new_password = getpass("Enter new password: ");
new_password2 = getpass("Verify new password: ");
if( strcmp( new_password, new_password2 ) )
{
printf("Passwords do not match\n");
free( new_password );
free( new_password2 );
continue;
}
}
/*
** change the password -
*/
{
int pw_result;
krb5_ccache ccache;
krb5_data pw_res_string, res_string;
kerr = krb5_cc_default( kcontext, &ccache );
if( kerr == 0 )
{
kerr = krb5_set_password_using_ccache(kcontext, ccache, new_password, target_principal,
&pw_result, &pw_res_string, &res_string );
if( kerr )
fprintf( stderr, "Failed: %s\n", error_message(kerr) );
else
{
if( pw_result )
{
fprintf( stderr, "Failed(%d)", pw_result );
if( pw_res_string.length > 0 )
fprintf( stderr, ": %s", pw_res_string.data);
if( res_string.length > 0 )
fprintf( stderr, " %s", res_string.data);
fprintf( stderr, "\n");
}
}
}
}
return(0);
}
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