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/*
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2009 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <netdb.h>
#include <krb5/locate_plugin.h>
#include "providers/krb5/krb5_auth.h"
#define SSSD_KRB5_LOCATOR_DEBUG "SSSD_KRB5_LOCATOR_DEBUG"
#define DEBUG_KEY "[sssd_krb5_locator] "
#define DEBUG(body) do { \
if (ctx->debug) { \
debug_fn body; \
} \
} while(0);
struct sssd_ctx {
char *sssd_realm;
struct addrinfo *sssd_kdc_addrinfo;
bool debug;
};
void debug_fn(const char *format, ...)
{
va_list ap;
char *s = NULL;
int ret;
va_start(ap, format);
ret = vasprintf(&s, format, ap);
if (ret < 0) {
/* ENOMEM */
return;
}
va_end(ap);
fprintf(stderr, DEBUG_KEY "%s", s);
free(s);
}
krb5_error_code sssd_krb5_locator_init(krb5_context context,
void **private_data)
{
struct sssd_ctx *ctx;
const char *dummy;
int ret;
ctx = calloc(1,sizeof(struct sssd_ctx));
if (ctx == NULL) return ENOMEM;
dummy = getenv(SSSD_KRB5_LOCATOR_DEBUG);
if (dummy == NULL) {
ctx->debug = false;
} else {
ctx->debug = true;
DEBUG(("sssd_krb5_locator_init called\n"));
}
dummy = getenv(SSSD_KRB5_REALM);
if (dummy == NULL) goto failed;
ctx->sssd_realm = strdup(dummy);
if (ctx->sssd_realm == NULL) goto failed;
dummy = getenv(SSSD_KRB5_KDC);
if (dummy == NULL) goto failed;
ret = getaddrinfo(dummy, "kerberos", NULL, &ctx->sssd_kdc_addrinfo);
if (ret != 0) {
DEBUG(("getaddrinfo failed [%d][%s].\n", ret, gai_strerror(ret)));
if (ret == EAI_SYSTEM) {
DEBUG(("getaddrinfo failed [%d][%s].\n", errno, strerror(errno)));
}
goto failed;
}
*private_data = ctx;
return 0;
failed:
freeaddrinfo(ctx->sssd_kdc_addrinfo);
free(ctx->sssd_realm);
free(ctx);
private_data = NULL;
return EINVAL;
}
void sssd_krb5_locator_close(void *private_data)
{
struct sssd_ctx *ctx;
if (private_data == NULL) return;
ctx = (struct sssd_ctx *) private_data;
DEBUG(("sssd_krb5_locator_close called\n"));
freeaddrinfo(ctx->sssd_kdc_addrinfo);
free(ctx->sssd_realm);
free(ctx);
private_data = NULL;
return;
}
krb5_error_code sssd_krb5_locator_lookup(void *private_data,
enum locate_service_type svc,
const char *realm,
int socktype,
int family,
int (*cbfunc)(void *, int, struct sockaddr *),
void *cbdata)
{
int ret;
struct addrinfo *ai;
struct sssd_ctx *ctx;
char hostip[NI_MAXHOST];
if (private_data == NULL) return KRB5_PLUGIN_NO_HANDLE;
ctx = (struct sssd_ctx *) private_data;
DEBUG(("sssd_realm[%s] requested realm[%s] family[%d] socktype[%d] "
"locate_service[%d]\n", ctx->sssd_realm, realm, family, socktype,
svc));
switch (svc) {
case locate_service_kdc:
case locate_service_master_kdc:
case locate_service_kadmin:
break;
case locate_service_krb524:
case locate_service_kpasswd:
return KRB5_PLUGIN_NO_HANDLE;
default:
return EINVAL;
}
switch (family) {
case AF_UNSPEC:
case AF_INET:
case AF_INET6:
break;
default:
return KRB5_PLUGIN_NO_HANDLE;
}
switch (socktype) {
case SOCK_STREAM:
case SOCK_DGRAM:
break;
default:
return EINVAL;
}
if (strcmp(realm, ctx->sssd_realm) != 0)
return KRB5_PLUGIN_NO_HANDLE;
for (ai = ctx->sssd_kdc_addrinfo; ai != NULL; ai = ai->ai_next) {
ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, hostip, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST);
if (ret != 0) {
DEBUG(("getnameinfo failed [%d][%s].\n", ret, gai_strerror(ret)));
if (ret == EAI_SYSTEM) {
DEBUG(("getnameinfo failed [%d][%s].\n", errno, strerror(errno)));
}
}
DEBUG(("addr[%s] family[%d] socktype[%d] - ", hostip, ai->ai_family,
ai->ai_socktype));
if ((family == AF_UNSPEC || ai->ai_family == family) &&
ai->ai_socktype == socktype) {
ret = cbfunc(cbdata, socktype, ai->ai_addr);
if (ret != 0) {
DEBUG(("\ncbfunc failed\n"));
} else {
DEBUG(("used\n"));
}
} else {
DEBUG((" NOT used\n"));
}
}
return 0;
}
const krb5plugin_service_locate_ftable service_locator = {
0, /* version */
sssd_krb5_locator_init,
sssd_krb5_locator_close,
sssd_krb5_locator_lookup,
};
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