krb5_error_code
k5_clean_hostname(krb5_context context, const char *host, char *cleanname,
size_t lhsize)
{
char *p;
krb5_error_code ret;
size_t l;
cleanname[0] = '\0';
if (host != NULL) {
if (strlcpy(cleanname, host, lhsize) >= lhsize)
return ENOMEM;
} else {
ret = krb5int_get_fq_local_hostname(cleanname, lhsize);
if (ret)
return ret;
}
/* Fold to lowercase. */
for (p = cleanname; *p; p++) {
if (isupper((unsigned char)*p))
*p = tolower((unsigned char)*p);
}
/* Strip off trailing dot. */
l = strlen(cleanname);
if (l > 0 && cleanname[l - 1] == '.')
cleanname[l - 1] = '\0';
return 0;
}
/*
* Common code for krb5_get_host_realm and krb5_get_fallback_host_realm
* to do basic sanity checks on supplied hostname.
*/
krb5_error_code KRB5_CALLCONV
krb5int_clean_hostname(krb5_context context, const char *host, char *local_host, size_t lhsize)
{
char *cp;
krb5_error_code retval;
int l;
local_host[0]=0;
#ifdef DEBUG_REFERRALS
printf("krb5int_clean_hostname called: host<%s>, local_host<%s>, size %d\n",host,local_host,lhsize);
#endif
if (host) {
/* Filter out numeric addresses if the caller utterly failed to
convert them to names. */
/* IPv4 - dotted quads only */
if (strspn(host, "01234567890.") == strlen(host)) {
/* All numbers and dots... if it's three dots, it's an
IP address, and we reject it. But "12345" could be
a local hostname, couldn't it? We'll just assume
that a name with three dots is not meant to be an
all-numeric hostname three all-numeric domains down
from the current domain. */
int ndots = 0;
const char *p;
for (p = host; *p; p++)
if (*p == '.')
ndots++;
if (ndots == 3)
return KRB5_ERR_NUMERIC_REALM;
}
if (strchr(host, ':'))
/* IPv6 numeric address form? Bye bye. */
return KRB5_ERR_NUMERIC_REALM;
/* Should probably error out if strlen(host) > MAXDNAME. */
strncpy(local_host, host, lhsize);
local_host[lhsize - 1] = '\0';
} else {
retval = krb5int_get_fq_local_hostname (local_host, lhsize);
if (retval)
return retval;
}
/* fold to lowercase */
for (cp = local_host; *cp; cp++) {
if (isupper((unsigned char) (*cp)))
*cp = tolower((unsigned char) *cp);
}
l = strlen(local_host);
/* strip off trailing dot */
if (l && local_host[l-1] == '.')
local_host[l-1] = 0;
#ifdef DEBUG_REFERRALS
printf("krb5int_clean_hostname ending: host<%s>, local_host<%s>, size %d\n",host,local_host,lhsize);
#endif
return 0;
}
krb5_error_code KRB5_CALLCONV
krb5_get_default_realm(krb5_context context, char **lrealm)
{
char *realm = 0;
char *cp;
char localhost[MAX_DNS_NAMELEN+1];
krb5_error_code retval;
(void) memset(localhost, 0, sizeof(localhost));
if (!context || (context->magic != KV5M_CONTEXT))
return KV5M_CONTEXT;
/*
* Solaris Kerberos: (illumos)
* Another way to provide the default realm.
*/
if (!context->default_realm) {
if ((realm = getenv("KRB5_DEFAULT_REALM")) != NULL) {
context->default_realm = strdup(realm);
if (context->default_realm == NULL)
return ENOMEM;
}
}
if (!context->default_realm) {
context->default_realm = 0;
if (context->profile != 0) {
retval = profile_get_string(context->profile, "libdefaults",
"default_realm", 0, 0,
&realm);
if (!retval && realm) {
context->default_realm = malloc(strlen(realm) + 1);
if (!context->default_realm) {
profile_release_string(realm);
return ENOMEM;
}
strcpy(context->default_realm, realm);
profile_release_string(realm);
}
}
if (context->default_realm == 0) {
#ifdef KRB5_DNS_LOOKUP
if (_krb5_use_dns_realm(context)) {
/*
* Since this didn't appear in our config file, try looking
* it up via DNS. Look for a TXT records of the form:
*
* _kerberos.<localhost>
* _kerberos.<domainname>
* _kerberos.<searchlist>
*
*/
char * p;
krb5int_get_fq_local_hostname (localhost, sizeof(localhost));
if ( localhost[0] ) {
p = localhost;
do {
retval = krb5_try_realm_txt_rr("_kerberos", p,
&context->default_realm);
p = strchr(p,'.');
if (p)
p++;
} while (retval && p && p[0]);
if (retval)
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
} else {
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
}
if (retval) {
return(KRB5_CONFIG_NODEFREALM);
}
} else
#endif /* KRB5_DNS_LOOKUP */
if (getenv("MS_INTEROP") == NULL) {
/*
* Solaris Kerberos:
* Try to find a realm based on one of the local IP addresses.
* Don't do this for AD, which often does _not_ support any
* DNS reverse lookup, making these queries take forever.
*/
(void) krb5int_foreach_localaddr(context,
krb5int_address_get_realm, 0, 0);
/*
* Solaris Kerberos:
* As a final fallback try to find a realm based on the resolver search
* list
*/
if (context->default_realm == 0) {
struct __res_state res;
int i;
(void) memset(&res, 0, sizeof (res));
if (res_ninit(&res) == 0) {
for (i = 0; res.dnsrch[i]; i++) {
krb5int_domain_get_realm(context,
res.dnsrch[i], &context->default_realm);
if (context->default_realm != 0)
break;
}
res_ndestroy(&res);
}
}
}
}
}
if (context->default_realm == 0)
return(KRB5_CONFIG_NODEFREALM);
if (context->default_realm[0] == 0) {
free (context->default_realm);
context->default_realm = 0;
return KRB5_CONFIG_NODEFREALM;
}
realm = context->default_realm;
/*LINTED*/
if (!(*lrealm = cp = malloc((unsigned int) strlen(realm) + 1)))
return ENOMEM;
strcpy(cp, realm);
return(0);
}
krb5_error_code KRB5_CALLCONV
krb5_get_default_realm(krb5_context context, char **lrealm)
{
char *realm = 0;
krb5_error_code retval;
if (!context || (context->magic != KV5M_CONTEXT))
return KV5M_CONTEXT;
if (!context->default_realm) {
/*
* XXX should try to figure out a reasonable default based
* on the host's DNS domain.
*/
context->default_realm = 0;
if (context->profile != 0) {
retval = profile_get_string(context->profile, KRB5_CONF_LIBDEFAULTS,
KRB5_CONF_DEFAULT_REALM, 0, 0,
&realm);
if (!retval && realm) {
context->default_realm = strdup(realm);
if (!context->default_realm) {
profile_release_string(realm);
return ENOMEM;
}
profile_release_string(realm);
}
}
#ifndef KRB5_DNS_LOOKUP
else
return KRB5_CONFIG_CANTOPEN;
#else /* KRB5_DNS_LOOKUP */
if (context->default_realm == 0) {
int use_dns = _krb5_use_dns_realm(context);
if ( use_dns ) {
/*
* Since this didn't appear in our config file, try looking
* it up via DNS. Look for a TXT records of the form:
*
* _kerberos.<localhost>
* _kerberos.<domainname>
* _kerberos.<searchlist>
*
*/
char localhost[MAX_DNS_NAMELEN+1];
char * p;
krb5int_get_fq_local_hostname (localhost, sizeof(localhost));
if ( localhost[0] ) {
p = localhost;
do {
retval = krb5_try_realm_txt_rr("_kerberos", p,
&context->default_realm);
p = strchr(p,'.');
if (p)
p++;
} while (retval && p && p[0]);
if (retval)
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
} else {
retval = krb5_try_realm_txt_rr("_kerberos", "",
&context->default_realm);
}
if (retval) {
return(KRB5_CONFIG_NODEFREALM);
}
}
}
#endif /* KRB5_DNS_LOOKUP */
}
if (context->default_realm == 0)
return(KRB5_CONFIG_NODEFREALM);
if (context->default_realm[0] == 0) {
free (context->default_realm);
context->default_realm = 0;
return KRB5_CONFIG_NODEFREALM;
}
realm = context->default_realm;
if (!(*lrealm = strdup(realm)))
return ENOMEM;
return(0);
}
