added kerberos locator plugin

6 files changed, 179 insertions, 1 deletions

diff --git a/server/Makefile.am b/server/Makefile.am
index bed9060bd..b15c23069 100644
--- a/server/Makefile.am
+++ b/server/Makefile.am
@@ -3,6 +3,7 @@ topdir=.
 sssdlibexecdir = $(libexecdir)/sssd
 sssdlibdir = $(libdir)/sssd
 ldblibdir = $(libdir)/ldb
+krb5plugindir = @krb5pluginpath@
 sssdconfdir = $(sysconfdir)/sssd
 dbusintrospectdir = $(datarootdir)/sssd/introspect
 dbuspolicydir = $(sysconfdir)/dbus-1/system.d
@@ -80,6 +81,9 @@ sssdlib_LTLIBRARIES = \
 ldblib_LTLIBRARIES = \
     memberof.la
 
+krb5plugin_LTLIBRARIES = \
+    sssd_krb5_locator_plugin.la
+
 noinst_LTLIBRARIES = \
     libsss_crypt.la
 libsss_crypt_la_SOURCES = \
@@ -208,6 +212,7 @@ dist_noinst_HEADERS = \
     providers/dp_backend.h \
     providers/providers.h \
     tools/tools_util.h \
+    krb5_plugin/sssd_krb5_locator_plugin.h \
     $(infopipe_headers) \
     $(polkit_headers)
 
@@ -403,6 +408,15 @@ memberof_la_LDFLAGS = \
     -avoid-version \
     -module
 
+sssd_krb5_locator_plugin_la_SOURCES = \
+    krb5_plugin/sssd_krb5_locator_plugin.c
+sssd_krb5_locator_plugin_la_CFLAGS = \
+    $(AM_CFLAGS) \
+    $(KRB5_CFLAGS)
+sssd_krb5_locator_plugin_la_LDFLAGS = \
+    -avoid-version \
+    -module
+
 ############
 # MANPAGES #
 ############
diff --git a/server/conf_macros.m4 b/server/conf_macros.m4
index 7e230bbf9..c67b47b08 100644
--- a/server/conf_macros.m4
+++ b/server/conf_macros.m4
@@ -132,7 +132,6 @@ AC_DEFUN([WITH_INIT_DIR],
     AC_SUBST(initdir)
   ])
 
-
 AC_DEFUN([WITH_SHADOW_UTILS_PATH],
   [ AC_ARG_WITH([shadow-utils-path],
                 [AC_HELP_STRING([--with-shadow-utils-path=PATH],
@@ -177,3 +176,16 @@ AC_DEFUN([WITH_XML_CATALOG],
     AC_SUBST([SGML_CATALOG_FILES])
   ])
 
+AC_DEFUN([WITH_KRB5_PLUGIN_PATH],
+  [ AC_ARG_WITH([krb5-plugin-path],
+                [AC_HELP_STRING([--with-krb5-plugin-path=PATH],
+                                [Path to kerberos plugin store [/usr/lib/krb5/plugins/libkrb5]]
+                               )
+                ]
+               )
+    krb5pluginpath="${libdir}/krb5/plugins/libkrb5"
+    if test x"$with_krb5_plugin_path" != x; then
+        krb5pluginpath=$with_krb5_plugin_path
+    fi
+    AC_SUBST(krb5pluginpath)
+  ])
diff --git a/server/configure.ac b/server/configure.ac
index 88032766e..facefe27a 100644
--- a/server/configure.ac
+++ b/server/configure.ac
@@ -49,6 +49,7 @@ WITH_INIT_DIR
 WITH_SHADOW_UTILS_PATH
 WITH_MANPAGES
 WITH_XML_CATALOG
+WITH_KRB5_PLUGIN_PATH
 
 m4_include([external/pkg.m4])
 m4_include([external/libpopt.m4])
@@ -59,6 +60,7 @@ m4_include([external/libldb.m4])
 m4_include([external/pam.m4])
 m4_include([external/ldap.m4])
 m4_include([external/libpcre.m4])
+m4_include([external/krb5.m4])
 m4_include([util/signal.m4])
 
 PKG_CHECK_MODULES([DBUS],[dbus-1])
diff --git a/server/external/krb5.m4 b/server/external/krb5.m4
new file mode 100644
index 000000000..1ed5064a5
--- /dev/null
+++ b/server/external/krb5.m4
@@ -0,0 +1,11 @@
+AC_SUBST(KRB5_CFLAGS)
+AC_SUBST(KRB5_LIBS)
+AC_PATH_PROG(KRB5_CONFIG, krb5-config)
+AC_MSG_CHECKING(for working krb5-config)
+if test -x "$KRB5_CONFIG"; then
+  KRB5_CFLAGS="`$KRB5_CONFIG --cflags`"
+  KRB5_LIBS="`$KRB5_CONFIG --libs`"
+  AC_MSG_RESULT(yes)
+else
+  AC_MSG_ERROR(no. Please install MIT kerberos devel package)
+fi
diff --git a/server/krb5_plugin/sssd_krb5_locator_plugin.c b/server/krb5_plugin/sssd_krb5_locator_plugin.c
new file mode 100644
index 000000000..699cad40d
--- /dev/null
+++ b/server/krb5_plugin/sssd_krb5_locator_plugin.c
@@ -0,0 +1,131 @@
+#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 <krb5/locate_plugin.h>
+
+#include "krb5_plugin/sssd_krb5_locator_plugin.h"
+
+struct sssd_ctx {
+    char *sssd_realm;
+    char *sssd_kdc;
+};
+
+krb5_error_code sssd_krb5_locator_init(krb5_context context,
+                                       void **private_data)
+{
+    struct sssd_ctx *ctx;
+    char *dummy;
+
+    ctx = calloc(1,sizeof(struct sssd_ctx));
+    if (ctx == NULL) return ENOMEM;
+
+    dummy = getenv(SSSD_REALM);
+    if (dummy == NULL) goto failed;
+    ctx->sssd_realm = strdup(dummy);
+    if (ctx->sssd_realm == NULL) goto failed;
+
+    dummy = getenv(SSSD_KDC);
+    if (dummy == NULL) goto failed;
+    ctx->sssd_kdc = strdup(dummy);
+    if (ctx->sssd_kdc == NULL) goto failed;
+
+    *private_data = ctx;
+
+    return 0;
+failed:
+    free(ctx->sssd_realm);
+    free(ctx->sssd_kdc);
+    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;
+    free(ctx->sssd_realm);
+    free(ctx->sssd_kdc);
+    free(ctx);
+
+    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 sockaddr_in addr;
+    struct sssd_ctx *ctx;
+
+    if (private_data == NULL) return KRB5_PLUGIN_NO_HANDLE;
+    ctx = (struct sssd_ctx *) private_data;
+
+#ifdef KRB5_PLUGIN_DEBUG
+    fprintf(stderr,"[%s][%s][%s][%d][%d][%d]\n", realm, ctx->sssd_realm,
+                                                 ctx->sssd_kdc, socktype,
+                                                 family, svc);
+#endif
+
+    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:
+            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;
+
+    addr.sin_family = AF_INET;
+    ret = inet_aton(ctx->sssd_kdc, &addr.sin_addr);
+    if (ret == 0) return EINVAL;
+    addr.sin_port = htons(88);
+
+    ret = cbfunc(cbdata, socktype, (struct sockaddr *) &addr);
+
+    return 0;
+}
+
+const krb5plugin_service_locate_ftable service_locator = {
+    0, /* version */
+    sssd_krb5_locator_init,
+    sssd_krb5_locator_close,
+    sssd_krb5_locator_lookup,
+};
diff --git a/server/krb5_plugin/sssd_krb5_locator_plugin.h b/server/krb5_plugin/sssd_krb5_locator_plugin.h
new file mode 100644
index 000000000..ab41689bc
--- /dev/null
+++ b/server/krb5_plugin/sssd_krb5_locator_plugin.h
@@ -0,0 +1,8 @@
+#ifndef __SSSD_KRB5_LOCATOR_PLUGIN_H__
+#define __SSSD_KRB5_LOCATOR_PLUGIN_H__
+
+#define SSSD_KDC "SSSD_KDC"
+#define SSSD_REALM "SSSD_REALM"
+
+#endif /* __SSSD_KRB5_LOCATOR_PLUGIN_H__ */
+