/*
* Walk through the components of a domain. At each stage determine
* if a KDC can be located for that domain. Return a realm
* corresponding to the upper-cased domain name for which a KDC was
* found or NULL if no KDC was found. Stop searching after limit
* labels have been removed from the domain (-1 means don't search at
* all, 0 means try only the full domain itself, 1 means also try the
* parent domain, etc.) or when we reach a parent with only one label.
*/
static krb5_error_code
domain_heuristic(krb5_context context, const char *domain,
char **realm, int limit)
{
krb5_error_code retval = 0, r;
struct addrlist alist;
krb5_data drealm;
char *cp = NULL;
char *fqdn = NULL;
*realm = NULL;
if (limit < 0)
return 0;
memset(&drealm, 0, sizeof (drealm));
if (!(fqdn = strdup(domain))) {
retval = ENOMEM;
goto cleanup;
}
/* Upper case the domain (for use as a realm) */
for (cp = fqdn; *cp; cp++)
if (islower((int)(*cp)))
*cp = toupper((int)*cp);
/* Search up to limit parents, as long as we have multiple labels. */
cp = fqdn;
while (limit-- >= 0 && strchr(cp, '.') != NULL) {
drealm.length = strlen(cp);
drealm.data = cp;
/* Find a kdc based on this part of the domain name. */
r = krb5_locate_kdc(context, &drealm, &alist, 0, SOCK_DGRAM, 0);
if (!r) { /* Found a KDC! */
krb5int_free_addrlist(&alist);
if (!(*realm = strdup(cp))) {
retval = ENOMEM;
goto cleanup;
}
break;
}
cp = strchr(cp, '.');
cp++;
}
cleanup:
if (fqdn)
free(fqdn);
return retval;
}
int
main (int argc, char *argv[])
{
char *p, *realmname;
krb5_data realm;
krb5_context ctx;
krb5_error_code err;
int master = 0;
p = strrchr (argv[0], '/');
if (p)
prog = p+1;
else
prog = argv[0];
switch (argc) {
case 2:
/* foo $realm */
realmname = argv[1];
break;
case 3:
if (!strcmp (argv[1], "-c"))
how = LOOKUP_CONF;
else if (!strcmp (argv[1], "-d"))
how = LOOKUP_DNS;
else if (!strcmp (argv[1], "-m"))
master = 1;
else
goto usage;
realmname = argv[2];
break;
default:
usage:
fprintf (stderr, "%s: usage: %s [-c | -d | -m] realm\n", prog, prog);
return 1;
}
err = krb5_init_context (&ctx);
if (err)
kfatal (err);
realm.data = realmname;
realm.length = strlen (realmname);
switch (how) {
case LOOKUP_CONF:
err = krb5_locate_srv_conf (ctx, &realm, "kdc", &al, 0,
htons (88), htons (750));
break;
case LOOKUP_DNS:
err = krb5_locate_srv_dns_1 (&realm, "_kerberos", "_udp", &al, 0);
break;
case LOOKUP_WHATEVER:
err = krb5_locate_kdc (ctx, &realm, &al, master, 0, 0);
break;
}
if (err) kfatal (err);
print_addrs ();
krb5int_free_addrlist (&al);
krb5_free_context (ctx);
return 0;
}
/*
* Solaris Kerberos
* Same as krb5_sendto_kdc plus an extra arg to return the FQDN
* of the KDC sent the request.
* Caller (at top of stack) needs to free hostname_used.
*/
krb5_error_code
krb5_sendto_kdc2 (krb5_context context, const krb5_data *message,
const krb5_data *realm, krb5_data *reply,
int *use_master, int tcp_only, char **hostname_used)
{
krb5_error_code retval, retval2;
struct addrlist addrs = ADDRLIST_INIT; /* Solaris Kerberos */
int socktype1 = 0, socktype2 = 0, addr_used;
/*
* find KDC location(s) for realm
*/
/*
* BUG: This code won't return "interesting" errors (e.g., out of mem,
* bad config file) from locate_kdc. KRB5_REALM_CANT_RESOLVE can be
* ignored from one query of two, but if only one query is done, or
* both return that error, it should be returned to the caller. Also,
* "interesting" errors (not KRB5_KDC_UNREACH) from sendto_{udp,tcp}
* should probably be returned as well.
*/
/*LINTED*/
dprint("krb5_sendto_kdc(%d@%p, \"%D\", use_master=%d, tcp_only=%d)\n",
/*LINTED*/
message->length, message->data, realm, *use_master, tcp_only);
if (!tcp_only && context->udp_pref_limit < 0) {
int tmp;
retval = profile_get_integer(context->profile,
"libdefaults", "udp_preference_limit", 0,
DEFAULT_UDP_PREF_LIMIT, &tmp);
if (retval)
return retval;
if (tmp < 0)
tmp = DEFAULT_UDP_PREF_LIMIT;
else if (tmp > HARD_UDP_LIMIT)
/* In the unlikely case that a *really* big value is
given, let 'em use as big as we think we can
support. */
tmp = HARD_UDP_LIMIT;
context->udp_pref_limit = tmp;
}
retval = (*use_master ? KRB5_KDC_UNREACH : KRB5_REALM_UNKNOWN);
if (tcp_only)
socktype1 = SOCK_STREAM, socktype2 = 0;
else if (message->length <= context->udp_pref_limit)
socktype1 = SOCK_DGRAM, socktype2 = SOCK_STREAM;
else
socktype1 = SOCK_STREAM, socktype2 = SOCK_DGRAM;
retval = krb5_locate_kdc(context, realm, &addrs, *use_master, socktype1, 0);
if (socktype2) {
struct addrlist addrs2;
retval2 = krb5_locate_kdc(context, realm, &addrs2, *use_master,
socktype2, 0);
#if 0
if (retval2 == 0) {
(void) merge_addrlists(&addrs, &addrs2);
krb5int_free_addrlist(&addrs2);
retval = 0;
} else if (retval == KRB5_REALM_CANT_RESOLVE) {
retval = retval2;
}
#else
retval = retval2;
if (retval == 0) {
(void) merge_addrlists(&addrs, &addrs2);
krb5int_free_addrlist(&addrs2);
}
#endif
}
if (addrs.naddrs > 0) {
krb5_error_code err = 0;
retval = krb5int_sendto (context, message, &addrs, 0, reply, 0, 0,
0, 0, &addr_used, check_for_svc_unavailable, &err);
switch (retval) {
case 0:
/*
* Set use_master to 1 if we ended up talking to a master when
* we didn't explicitly request to
*/
if (*use_master == 0) {
struct addrlist addrs3;
retval = krb5_locate_kdc(context, realm, &addrs3, 1,
addrs.addrs[addr_used].ai->ai_socktype,
addrs.addrs[addr_used].ai->ai_family);
if (retval == 0) {
if (in_addrlist(addrs.addrs[addr_used].ai, &addrs3))
*use_master = 1;
krb5int_free_addrlist (&addrs3);
}
}
if (hostname_used) {
struct sockaddr *sa;
char buf[NI_MAXHOST];
int err;
*hostname_used = NULL;
sa = addrs.addrs[addr_used].ai->ai_addr;
err = getnameinfo (sa, socklen (sa), buf, sizeof (buf), 0, 0,
AI_CANONNAME);
if (err)
err = getnameinfo (sa, socklen (sa), buf,
sizeof (buf), 0, 0,
NI_NUMERICHOST);
if (!err)
*hostname_used = strdup(buf);
/* don't sweat strdup fail */
}
krb5int_free_addrlist (&addrs);
return 0;
default:
break;
/* Cases here are for constructing useful error messages. */
case KRB5_KDC_UNREACH:
if (err == KDC_ERR_SVC_UNAVAILABLE) {
retval = KRB5KDC_ERR_SVC_UNAVAILABLE;
} else {
krb5_set_error_message(context, retval,
dgettext(TEXT_DOMAIN,
"Cannot contact any KDC for realm '%.*s'"),
realm->length, realm->data);
}
break;
}
krb5int_free_addrlist (&addrs);
}
return retval;
}
