#include <stdio.h>
#include <syslog.h>
#include <signal.h>
#include <errno.h>
#include <netdb.h>
#include "k5-int.h"
#include "com_err.h"
#include "adm.h"
#include "adm_proto.h"
#include "kdc_util.h"
#include "extern.h"
#include "kdc5_err.h"
#include "kdb_kt.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef KRB5_KRB4_COMPAT
#include <des.h>
#endif
#if defined(NEED_DAEMON_PROTO)
extern int daemon(int, int);
#endif
void usage (char *);
krb5_sigtype request_exit (int);
krb5_sigtype request_hup (int);
void setup_signal_handlers (void);
krb5_error_code setup_sam (void);
void initialize_realms (krb5_context, int, char **);
void finish_realms (char *);
static int nofork = 0;
static int rkey_init_done = 0;
#ifdef POSIX_SIGNALS
static struct sigaction s_action;
#endif
#define KRB5_KDC_MAX_REALMS 32
kdc_realm_t *
find_realm_data(char *rname, krb5_ui_4 rsize)
{
int i;
for (i=0; i<kdc_numrealms; i++) {
if ((rsize == strlen(kdc_realmlist[i]->realm_name)) &&
!strncmp(rname, kdc_realmlist[i]->realm_name, rsize))
return(kdc_realmlist[i]);
}
return((kdc_realm_t *) NULL);
}
krb5_error_code
setup_server_realm(krb5_principal sprinc)
{
krb5_error_code kret;
kdc_realm_t *newrealm;
kret = 0;
if (kdc_numrealms > 1) {
if (!(newrealm = find_realm_data(sprinc->realm.data,
(krb5_ui_4) sprinc->realm.length)))
kret = ENOENT;
else
kdc_active_realm = newrealm;
}
else
kdc_active_realm = kdc_realmlist[0];
return(kret);
}
static void
finish_realm(kdc_realm_t *rdp)
{
if (rdp->realm_dbname)
free(rdp->realm_dbname);
if (rdp->realm_mpname)
free(rdp->realm_mpname);
if (rdp->realm_stash)
free(rdp->realm_stash);
if (rdp->realm_ports)
free(rdp->realm_ports);
if (rdp->realm_tcp_ports)
free(rdp->realm_tcp_ports);
if (rdp->realm_keytab)
krb5_kt_close(rdp->realm_context, rdp->realm_keytab);
if (rdp->realm_context) {
if (rdp->realm_mprinc)
krb5_free_principal(rdp->realm_context, rdp->realm_mprinc);
if (rdp->realm_mkey.length && rdp->realm_mkey.contents) {
memset(rdp->realm_mkey.contents, 0, rdp->realm_mkey.length);
free(rdp->realm_mkey.contents);
}
krb5_db_fini(rdp->realm_context);
if (rdp->realm_tgsprinc)
krb5_free_principal(rdp->realm_context, rdp->realm_tgsprinc);
krb5_free_context(rdp->realm_context);
}
memset((char *) rdp, 0, sizeof(*rdp));
free(rdp);
}
static krb5_error_code
init_realm(char *progname, kdc_realm_t *rdp, char *realm, char *def_dbname,
char *def_mpname, krb5_enctype def_enctype, char *def_udp_ports,
char *def_tcp_ports, krb5_boolean def_manual)
{
krb5_error_code kret;
krb5_boolean manual;
krb5_realm_params *rparams;
memset((char *) rdp, 0, sizeof(kdc_realm_t));
if (!realm) {
kret = EINVAL;
goto whoops;
}
rdp->realm_name = realm;
kret = krb5_init_context(&rdp->realm_context);
if (kret) {
com_err(progname, kret, "while getting context for realm %s",
realm);
goto whoops;
}
kret = krb5_read_realm_params(rdp->realm_context, rdp->realm_name,
(char *) NULL, (char *) NULL, &rparams);
if (kret) {
com_err(progname, kret, "while reading realm parameters");
goto whoops;
}
if (rparams && rparams->realm_profile)
rdp->realm_profile = strdup(rparams->realm_profile);
if (rparams && rparams->realm_dbname)
rdp->realm_dbname = strdup(rparams->realm_dbname);
else
rdp->realm_dbname = (def_dbname) ? strdup(def_dbname) :
strdup(DEFAULT_KDB_FILE);
if (rparams && rparams->realm_mkey_name)
rdp->realm_mpname = strdup(rparams->realm_mkey_name);
else
rdp->realm_mpname = (def_mpname) ? strdup(def_mpname) :
strdup(KRB5_KDB_M_NAME);
if (rparams && rparams->realm_kdc_ports)
rdp->realm_ports = strdup(rparams->realm_kdc_ports);
else
rdp->realm_ports = strdup(def_udp_ports);
if (rparams && rparams->realm_kdc_tcp_ports)
rdp->realm_tcp_ports = strdup(rparams->realm_kdc_ports);
else
rdp->realm_tcp_ports = strdup(def_tcp_ports);
if (rparams && rparams->realm_stash_file) {
rdp->realm_stash = strdup(rparams->realm_stash_file);
manual = FALSE;
} else
manual = def_manual;
if (rparams && rparams->realm_enctype_valid)
rdp->realm_mkey.enctype = (krb5_enctype) rparams->realm_enctype;
else
rdp->realm_mkey.enctype = manual ? def_enctype : ENCTYPE_UNKNOWN;
if (rparams && rparams->realm_reject_bad_transit_valid)
rdp->realm_reject_bad_transit = rparams->realm_reject_bad_transit;
else
rdp->realm_reject_bad_transit = 1;
rdp->realm_maxlife = (rparams && rparams->realm_max_life_valid) ?
rparams->realm_max_life : KRB5_KDB_MAX_LIFE;
rdp->realm_maxrlife = (rparams && rparams->realm_max_rlife_valid) ?
rparams->realm_max_rlife : KRB5_KDB_MAX_RLIFE;
if (rparams)
krb5_free_realm_params(rdp->realm_context, rparams);
if ((kret = krb5_set_default_realm(rdp->realm_context, realm))) {
com_err(progname, kret, "while setting default realm to %s",
realm);
goto whoops;
}
if ((kret = krb5_db_setup_mkey_name(rdp->realm_context, rdp->realm_mpname,
rdp->realm_name, (char **) NULL,
&rdp->realm_mprinc))) {
com_err(progname, kret,
"while setting up master key name %s for realm %s",
rdp->realm_mpname, realm);
goto whoops;
}
if ((kret = krb5_db_fetch_mkey(rdp->realm_context, rdp->realm_mprinc,
rdp->realm_mkey.enctype, manual,
FALSE, rdp->realm_stash,
0, &rdp->realm_mkey))) {
com_err(progname, kret,
"while fetching master key %s for realm %s",
rdp->realm_mpname, realm);
goto whoops;
}
if (rdp->realm_dbname &&
(kret = krb5_db_set_name(rdp->realm_context, rdp->realm_dbname))) {
com_err(progname, kret,
"while setting database name to %s for realm %s",
rdp->realm_dbname, realm);
goto whoops;
}
if ((kret = krb5_db_init(rdp->realm_context))) {
com_err(progname, kret,
"while initializing database for realm %s", realm);
goto whoops;
}
if ((kret = krb5_db_verify_master_key(rdp->realm_context,
rdp->realm_mprinc,
&rdp->realm_mkey))) {
com_err(progname, kret,
"while verifying master key for realm %s", realm);
goto whoops;
}
if ((kret = krb5_db_set_mkey(rdp->realm_context, &rdp->realm_mkey))) {
com_err(progname, kret,
"while setting master key for realm %s", realm);
goto whoops;
}
if ((kret = krb5_ktkdb_resolve(rdp->realm_context, NULL,
&rdp->realm_keytab))) {
com_err(progname, kret,
"while resolving kdb keytab for realm %s", realm);
goto whoops;
}
if ((kret = krb5_build_principal(rdp->realm_context, &rdp->realm_tgsprinc,
strlen(realm), realm, KRB5_TGS_NAME,
realm, (char *) NULL))) {
com_err(progname, kret,
"while building TGS name for realm %s", realm);
goto whoops;
}
if (!rkey_init_done) {
krb5_data seed;
#ifdef KRB5_KRB4_COMPAT
krb5_keyblock temp_key;
#endif
seed.length = rdp->realm_mkey.length;
seed.data = rdp->realm_mkey.contents;
if ((kret = krb5_c_random_add_entropy(rdp->realm_context,
KRB5_C_RANDSOURCE_TRUSTEDPARTY, &seed)))
goto whoops;
#ifdef KRB5_KRB4_COMPAT
if ((kret = krb5_c_make_random_key(rdp->realm_context,
ENCTYPE_DES_CBC_CRC, &temp_key))) {
com_err(progname, kret,
"while initializing V4 random key generator");
goto whoops;
}
(void) des_init_random_number_generator(temp_key.contents);
krb5_free_keyblock_contents(rdp->realm_context, &temp_key);
#endif
rkey_init_done = 1;
}
whoops:
if (kret) {
finish_realm(rdp);
}
return(kret);
}
krb5_sigtype
request_exit(int signo)
{
signal_requests_exit = 1;
#ifdef POSIX_SIGTYPE
return;
#else
return(0);
#endif
}
krb5_sigtype
request_hup(int signo)
{
signal_requests_hup = 1;
#ifdef POSIX_SIGTYPE
return;
#else
return(0);
#endif
}
void
setup_signal_handlers(void)
{
#ifdef POSIX_SIGNALS
(void) sigemptyset(&s_action.sa_mask);
s_action.sa_flags = 0;
s_action.sa_handler = request_exit;
(void) sigaction(SIGINT, &s_action, (struct sigaction *) NULL);
(void) sigaction(SIGTERM, &s_action, (struct sigaction *) NULL);
s_action.sa_handler = request_hup;
(void) sigaction(SIGHUP, &s_action, (struct sigaction *) NULL);
#else
signal(SIGINT, request_exit);
signal(SIGTERM, request_exit);
signal(SIGHUP, request_hup);
#endif
return;
}
krb5_error_code
setup_sam(void)
{
return krb5_c_make_random_key(kdc_context, ENCTYPE_DES_CBC_MD5, &psr_key);
}
void
usage(char *name)
{
fprintf(stderr, "usage: %s [-d dbpathname] [-r dbrealmname] [-R replaycachename ]\n\t[-m] [-k masterenctype] [-M masterkeyname] [-p port] [-4 v4mode] [-X] [-n]\n", name);
return;
}
void
initialize_realms(krb5_context kcontext, int argc, char **argv)
{
int c;
char *db_name = (char *) NULL;
char *mkey_name = (char *) NULL;
char *rcname = KDCRCACHE;
char *lrealm;
krb5_error_code retval;
krb5_enctype menctype = ENCTYPE_UNKNOWN;
kdc_realm_t *rdatap;
krb5_boolean manual = FALSE;
char *default_udp_ports = 0;
char *default_tcp_ports = 0;
krb5_pointer aprof;
const char *hierarchy[3];
#ifdef KRB5_KRB4_COMPAT
char *v4mode = 0;
#endif
extern char *optarg;
#ifdef ATHENA_DES3_KLUDGE
extern struct krb5_keytypes krb5_enctypes_list[];
extern int krb5_enctypes_length;
#endif
if (!krb5_aprof_init(DEFAULT_KDC_PROFILE, KDC_PROFILE_ENV, &aprof)) {
hierarchy[0] = "kdcdefaults";
hierarchy[1] = "kdc_ports";
hierarchy[2] = (char *) NULL;
if (krb5_aprof_get_string(aprof, hierarchy, TRUE, &default_udp_ports))
default_udp_ports = 0;
hierarchy[1] = "kdc_tcp_ports";
if (krb5_aprof_get_string(aprof, hierarchy, TRUE, &default_tcp_ports))
default_tcp_ports = 0;
#ifdef KRB5_KRB4_COMPAT
hierarchy[1] = "v4_mode";
if (krb5_aprof_get_string(aprof, hierarchy, TRUE, &v4mode))
v4mode = 0;
#endif
if (aprof)
krb5_aprof_finish(aprof);
}
if (default_udp_ports == 0)
default_udp_ports = strdup(DEFAULT_KDC_UDP_PORTLIST);
if (default_tcp_ports == 0)
default_tcp_ports = strdup(DEFAULT_KDC_TCP_PORTLIST);
while ((c = getopt(argc, argv, "r:d:mM:k:R:e:p:s:n4:X3")) != -1) {
switch(c) {
case 'r':
if (!find_realm_data(optarg, (krb5_ui_4) strlen(optarg))) {
if ((rdatap = (kdc_realm_t *) malloc(sizeof(kdc_realm_t)))) {
if ((retval = init_realm(argv[0], rdatap, optarg, db_name,
mkey_name, menctype,
default_udp_ports,
default_tcp_ports, manual))) {
fprintf(stderr,"%s: cannot initialize realm %s - see log file for details\n",
argv[0], optarg);
exit(1);
}
kdc_realmlist[kdc_numrealms] = rdatap;
kdc_numrealms++;
}
}
break;
case 'd':
db_name = optarg;
break;
case 'm':
manual = TRUE;
if (menctype == ENCTYPE_UNKNOWN)
menctype = ENCTYPE_DES_CBC_CRC;
break;
case 'M':
mkey_name = optarg;
break;
case 'n':
nofork++;
break;
case 'k':
if (krb5_string_to_enctype(optarg, &menctype))
com_err(argv[0], 0, "invalid enctype %s", optarg);
break;
case 'R':
rcname = optarg;
break;
case 'p':
if (default_udp_ports)
free(default_udp_ports);
default_udp_ports = strdup(optarg);
#if 0
if (default_tcp_ports)
free(default_tcp_ports);
default_tcp_ports = strdup(optarg);
#endif
break;
case '4':
#ifdef KRB5_KRB4_COMPAT
if (v4mode)
free(v4mode);
v4mode = strdup(optarg);
#endif
break;
case 'X':
#ifdef KRB5_KRB4_COMPAT
enable_v4_crossrealm(argv[0]);
#endif
break;
case '3':
#ifdef ATHENA_DES3_KLUDGE
if (krb5_enctypes_list[krb5_enctypes_length-1].etype
!= ENCTYPE_LOCAL_DES3_HMAC_SHA1) {
fprintf(stderr,
"internal inconsistency in enctypes_list"
" while disabling\n"
"des3-marc-hmac-sha1 enctype\n");
exit(1);
}
krb5_enctypes_length--;
break;
#endif
case '?':
default:
usage(argv[0]);
exit(1);
}
}
#ifdef KRB5_KRB4_COMPAT
process_v4_mode(argv[0], v4mode);
#endif
if (kdc_numrealms == 0) {
if ((retval = krb5_get_default_realm(kcontext, &lrealm))) {
com_err(argv[0], retval,
"while attempting to retrieve default realm");
fprintf (stderr, "%s: %s, attempting to retrieve default realm\n",
argv[0], error_message (retval));
exit(1);
}
if ((rdatap = (kdc_realm_t *) malloc(sizeof(kdc_realm_t)))) {
if ((retval = init_realm(argv[0], rdatap, lrealm, db_name,
mkey_name, menctype, default_udp_ports,
default_tcp_ports, manual))) {
fprintf(stderr,"%s: cannot initialize realm %s - see log file for details\n",
argv[0], lrealm);
exit(1);
}
kdc_realmlist[0] = rdatap;
kdc_numrealms++;
}
}
#ifdef USE_RCACHE
if ((retval = kdc_initialize_rcache(kcontext, rcname))) {
com_err(argv[0], retval, "while initializing KDC replay cache '%s'",
rcname);
exit(1);
}
#endif
kdc_active_realm = kdc_realmlist[0];
if (default_udp_ports)
free(default_udp_ports);
if (default_tcp_ports)
free(default_tcp_ports);
return;
}
void
finish_realms(char *prog)
{
int i;
for (i = 0; i < kdc_numrealms; i++) {
finish_realm(kdc_realmlist[i]);
kdc_realmlist[i] = 0;
}
}
int main(int argc, char **argv)
{
krb5_error_code retval;
krb5_context kcontext;
int errout = 0;
if (strrchr(argv[0], '/'))
argv[0] = strrchr(argv[0], '/')+1;
if (!(kdc_realmlist = (kdc_realm_t **) malloc(sizeof(kdc_realm_t *) *
KRB5_KDC_MAX_REALMS))) {
fprintf(stderr, "%s: cannot get memory for realm list\n", argv[0]);
exit(1);
}
memset((char *) kdc_realmlist, 0,
(size_t) (sizeof(kdc_realm_t *) * KRB5_KDC_MAX_REALMS));
retval = krb5_init_context(&kcontext);
if (retval) {
com_err(argv[0], retval, "while initializing krb5");
exit(1);
}
krb5_klog_init(kcontext, "kdc", argv[0], 1);
initialize_kdc5_error_table();
initialize_realms(kcontext, argc, argv);
setup_signal_handlers();
retval = setup_sam();
if (retval) {
com_err(argv[0], retval, "while initializing SAM");
finish_realms(argv[0]);
return 1;
}
if ((retval = setup_network(argv[0]))) {
com_err(argv[0], retval, "while initializing network");
finish_realms(argv[0]);
return 1;
}
if (!nofork && daemon(0, 0)) {
com_err(argv[0], errno, "while detaching from tty");
finish_realms(argv[0]);
return 1;
}
krb5_klog_syslog(LOG_INFO, "commencing operation");
if ((retval = listen_and_process(argv[0]))) {
com_err(argv[0], retval, "while processing network requests");
errout++;
}
if ((retval = closedown_network(argv[0]))) {
com_err(argv[0], retval, "while shutting down network");
errout++;
}
krb5_klog_syslog(LOG_INFO, "shutting down");
krb5_klog_close(kdc_context);
finish_realms(argv[0]);
if (kdc_realmlist)
free(kdc_realmlist);
#ifdef USE_RCACHE
(void) krb5_rc_close(kcontext, kdc_rcache);
#endif
#ifndef NOCACHE
kdc_free_lookaside(kcontext);
#endif
krb5_free_context(kcontext);
return errout;
}