/*
 * Copyright (c) 1997 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. All advertising materials mentioning features or use of this software 
 *    must display the following acknowledgement: 
 *      This product includes software developed by Kungliga Tekniska 
 *      Högskolan and its contributors. 
 *
 * 4. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "hprop.h"
#ifdef KRB4
#define Principal Principal4
#include <krb.h>
#include <krb_db.h>
#endif

RCSID("$Id$");

static int version_flag;
static int help_flag;
static char *ktname = HPROP_KEYTAB;
static char *database;
static char *mkeyfile;
static int to_stdout;
static int verbose_flag;
static int encrypt_flag;
static int decrypt_flag;
static EncryptionKey mkey5;
static krb5_data msched5;

#ifdef KRB4
static int v4_db;
#endif

int open_socket(krb5_context context, const char *hostname)
{
    int s;
    struct hostent *hp;
    struct sockaddr_in sin;
    s = socket(AF_INET, SOCK_STREAM, 0);
    if(s < 0){
	warn("socket");
	return -1;
    }
    hp = gethostbyname(hostname);
    if(hp == NULL){
	warnx("%s: %s", hostname, hstrerror(h_errno));
	close(s);
	return -1;
    }
    memset(&sin, 0, sizeof(sin));
    sin.sin_family = AF_INET;
    sin.sin_port = krb5_getportbyname (context, "hprop", "tcp", HPROP_PORT);
    memcpy(&sin.sin_addr, hp->h_addr, hp->h_length);
    if(connect(s, (struct sockaddr*)&sin, sizeof(sin)) < 0){
	warn("connect");
	close(s);
	return -1;
    }
    return s;
}

struct prop_data{
    krb5_context context;
    krb5_auth_context auth_context;
    int sock;
};

int hdb_entry2value(krb5_context, hdb_entry*, krb5_data*);

krb5_error_code
v5_prop(krb5_context context, HDB *db, hdb_entry *entry, void *appdata)
{
    krb5_error_code ret;
    struct prop_data *pd = appdata;
    krb5_data data;
    int i;

    if(encrypt_flag)
	hdb_seal_keys(entry, msched5);
    if(decrypt_flag)
	hdb_unseal_keys(entry, msched5);

    ret = hdb_entry2value(context, entry, &data);
    if(ret) return ret;

    if(to_stdout)
	ret = send_clear(context, STDOUT_FILENO, data);
    else
	ret = send_priv(context, pd->auth_context, &data, pd->sock);
    krb5_data_free(&data);
    return ret;
}

#ifdef KRB4
static des_cblock mkey4;
static des_key_schedule msched4;
static char realm[REALM_SZ];

static int
v4_prop(void *arg, Principal *p)
{
    struct prop_data *pd = arg;
    hdb_entry ent;
    krb5_error_code ret;

    memset(&ent, 0, sizeof(ent));

    ret = krb5_425_conv_principal(pd->context, p->name, p->instance, realm,
				  &ent.principal);
    if(ret){
	krb5_warn(pd->context, ret, "%s.%s@%s", p->name, p->instance, realm);
	return 0;
    }

    if(verbose_flag){
	char *s;
	krb5_unparse_name(pd->context, ent.principal, &s);
	krb5_warnx(pd->context, "%s.%s -> %s", p->name, p->instance, s);
	free(s);
    }

    ent.keys.len = 1;
    ALLOC(ent.keys.val);
    ent.keys.val[0].mkvno = p->kdc_key_ver;
    ent.keys.val[0].salt = calloc(1, sizeof(*ent.keys.val[0].salt));
    ent.keys.val[0].salt->type = pa_pw_salt;
    ent.kvno = p->key_version;
    ent.keys.val[0].key.keytype = KEYTYPE_DES;
    krb5_data_alloc(&ent.keys.val[0].key.keyvalue, sizeof(des_cblock));
    
    {
	unsigned char *key = ent.keys.val[0].key.keyvalue.data;
	memcpy(key, &p->key_low, 4);
	memcpy(key + 4, &p->key_high, 4);
	kdb_encrypt_key((des_cblock*)key, (des_cblock*)key, &mkey4, msched4, 0);
    }
    if(encrypt)
	hdb_seal_keys(&ent, msched5);

    ALLOC(ent.max_life);
    *ent.max_life = krb_life_to_time(0, p->max_life);
    if(*ent.max_life == NEVERDATE){
	free(ent.max_life);
	ent.max_life = NULL;
    }

    ALLOC(ent.pw_end);
    *ent.pw_end = p->exp_date;
    ret = krb5_make_principal(pd->context, &ent.created_by.principal,
			      realm,
			      "kadmin",
			      "hprop",
			      NULL);
    ent.created_by.time = time(NULL);
    ALLOC(ent.modified_by);
    krb5_425_conv_principal(pd->context, p->mod_name, p->mod_instance, realm,
			    &ent.modified_by->principal);
    ent.modified_by->time = p->mod_date;

    ent.flags.forwardable = 1;
    ent.flags.renewable = 1;
    ent.flags.proxiable = 1;
    ent.flags.postdate = 1;
    ent.flags.client = 1;
    ent.flags.server = 1;

    ret = v5_prop(pd->context, NULL, &ent, pd);
    hdb_free_entry(pd->context, &ent);
    return ret;
}

#endif


struct getargs args[] = {
    { "master-key", 'm', arg_string, &mkeyfile, "v5 master key file", "file" },
#ifdef KRB4
#endif
    { "database", 'd',	arg_string, &database, "database", "file" },
#ifdef KRB4
    { "v4-db",    '4',	arg_flag, &v4_db, "use version 4 database" },
#endif
    { "keytab",   'k',	arg_string, &ktname, "keytab to use for authentication", "keytab" },
    { "decrypt",  'D',  arg_flag,   &decrypt_flag,   "decrypt keys" },
    { "encrypt",  'E',  arg_flag,   &encrypt_flag,   "encrypt keys" },
    { "stdout",	  'n',  arg_flag,   &to_stdout, "dump to stdout" },
    { "verbose",  'v',	arg_flag, &verbose_flag },
    { "version",   0,	arg_flag, &version_flag },
    { "help",     'h',	arg_flag, &help_flag }
};

static int num_args = sizeof(args) / sizeof(args[0]);

void usage(int ret)
{
    arg_printusage (args, num_args, "host ...");
    exit (ret);
}

void
get_creds(krb5_context context, krb5_ccache *cache)
{
    krb5_keytab keytab;
    krb5_principal client;
    krb5_error_code ret;
    krb5_get_init_creds_opt init_opts;
    krb5_preauthtype preauth = KRB5_PADATA_ENC_TIMESTAMP;
    krb5_creds creds;
    
    ret = krb5_kt_resolve(context, ktname, &keytab);
    if(ret) krb5_err(context, 1, ret, "krb5_kt_resolve");
    
    ret = krb5_make_principal(context, &client, NULL, 
			      "kadmin", HPROP_NAME, NULL);
    if(ret) krb5_err(context, 1, ret, "krb5_make_principal");

    krb5_get_init_creds_opt_init(&init_opts);
    krb5_get_init_creds_opt_set_preauth_list(&init_opts, &preauth, 1);

    ret = krb5_get_init_creds_keytab(context, &creds, client, keytab, 0, NULL, &init_opts);
    if(ret) krb5_err(context, 1, ret, "krb5_get_init_creds");
    
    ret = krb5_kt_close(context, keytab);
    if(ret) krb5_err(context, 1, ret, "krb5_kt_close");
    
    ret = krb5_cc_gen_new(context, &krb5_mcc_ops, cache);
    if(ret) krb5_err(context, 1, ret, "krb5_cc_gen_new");

    ret = krb5_cc_initialize(context, *cache, client);
    if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize");

    ret = krb5_cc_store_cred(context, *cache, &creds);
    if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred");
}

int main(int argc, char **argv)
{
    krb5_error_code ret;
    int e;
    krb5_context context;
    krb5_auth_context ac;
    krb5_principal server;
    krb5_ccache ccache;
    int fd;
    HDB *db;
    int optind = 0;
    int i;

    set_progname(argv[0]);

    if(getarg(args, num_args, argc, argv, &optind))
	usage(1);

    if(help_flag)
	usage(0);
    
    if(version_flag){
	fprintf(stderr, "%s (%s)\n", __progname, heimdal_version);
	exit(0);
    }

    ret = krb5_init_context(&context);
    if(ret)
	exit(1);

    if(encrypt_flag && decrypt_flag)
	krb5_errx(context, 1, 
		  "Only one of `--encrypt' and `--decrypt' is meaningful");

    if(!to_stdout)
	get_creds(context, &ccache);
    
    ret = hdb_read_master_key(context, mkeyfile, &mkey5);
    if(ret && ret != ENOENT)
	krb5_err(context, 1, ret, "hdb_read_master_key");
    if(ret){
	if(encrypt_flag || decrypt_flag)
	    krb5_errx(context, 1, "No master key file found");
    }else{
	ret = hdb_process_master_key(context, mkey5, &msched5);
	if(ret)
	    krb5_err(context, 1, ret, "hdb_process_master_key");
    }
    
#ifdef KRB4
    if(v4_db){
	e = kerb_db_set_name (database);
	if(e) krb5_errx(context, 1, "kerb_db_set_name: %s", krb_get_err_text(e));
	e = kdb_get_master_key(0, &mkey4, msched4);
	if(e) krb5_errx(context, 1, "kdb_get_master_key: %s", krb_get_err_text(e));
	e = krb_get_lrealm(realm, 1);
	if(e) krb5_errx(context, 1, "krb_get_lrealm: %s", krb_get_err_text(e));
    }else
#endif
	{
	    ret = hdb_open(context, &db, database, O_RDONLY, 0);
	    if(ret) krb5_err(context, 1, ret, "hdb_open");
	}

    if(to_stdout){
	struct prop_data pd;
	pd.context = context;
	pd.auth_context = ac;
	pd.sock = fd;
	
#ifdef KRB4
	if(v4_db){
	    e = kerb_db_iterate ((k_iter_proc_t)v4_prop, &pd);
	    if(e)
		krb5_errx(context, 1, "kerb_db_iterate: %s", 
			  krb_get_err_text(e));
	} else {
#endif
	    ret = hdb_foreach(context, db, v5_prop, &pd);
	    if(ret)
		krb5_err(context, 1, ret, "hdb_foreach");
	}
    }else{

	for(i = optind; i < argc; i++){
	    fd = open_socket(context, argv[i]);
	    if(fd < 0)
		continue;

	    ret = krb5_sname_to_principal(context, argv[i], 
					  HPROP_NAME, KRB5_NT_SRV_HST, &server);
	    if(ret) {
		krb5_warn(context, ret, "krb5_sname_to_principal(%s)", argv[i]);
		close(fd);
		continue;
	    }
    
	    ac = NULL;
	    ret = krb5_sendauth(context,
				&ac,
				&fd,
				HPROP_VERSION,
				NULL,
				server,
				AP_OPTS_MUTUAL_REQUIRED,
				NULL, /* in_data */
				NULL, /* in_creds */
				ccache,
				NULL,
				NULL,
				NULL);

	    if(ret){
		krb5_warn(context, ret, "krb5_sendauth");
		close(fd);
		continue;
	    }

	    {
		struct prop_data pd;
		pd.context = context;
		pd.auth_context = ac;
		pd.sock = fd;
	
#ifdef KRB4
		if(v4_db)
		    e = kerb_db_iterate ((k_iter_proc_t)v4_prop, &pd);
		else
#endif
		    ret = hdb_foreach(context, db, v5_prop, &pd);
	    }
	    if(ret)
		krb5_warn(context, ret, "krb5_sendauth");
	    else {
		krb5_data data;
		data.data = NULL;
		data.length = 0;
		ret = send_priv(context, ac, &data, fd);
	    }

	    {
		krb5_data data;
		ret = recv_priv(context, ac, fd, &data);
		if(ret) krb5_warn(context, ret, "recv_priv");
		if(data.length != 0)
		    krb5_data_free(&data); /* XXX */
	    }
	
	    if(ret) krb5_warn(context, ret, "send_priv");
	    krb5_auth_con_free(context, ac);
	    close(fd);
	}
    }
    exit(0);
}