PAC client: add krb5 authdata plugin

5 files changed, 503 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
index fd989c49a..445492e22 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,6 +23,9 @@ ldblibdir = @ldblibdir@
 if BUILD_KRB5_LOCATOR_PLUGIN
 krb5plugindir = @krb5pluginpath@
 endif
+if BUILD_PAC_RESPONDER
+krb5authdata_plugindir = @krb5authdatapluginpath@
+endif
 sssdconfdir = $(sysconfdir)/sssd
 sssddatadir = $(datadir)/sssd
 sssdapiplugindir = $(sssddatadir)/sssd.api.d
@@ -154,6 +157,11 @@ krb5plugin_LTLIBRARIES = \
     sssd_krb5_locator_plugin.la
 endif
 
+if BUILD_PAC_RESPONDER
+krb5authdata_plugin_LTLIBRARIES = \
+    sssd_pac_plugin.la
+endif
+
 noinst_LTLIBRARIES = \
     libsss_crypt.la
 
@@ -1397,6 +1405,19 @@ sssd_krb5_locator_plugin_la_LDFLAGS = \
     -module
 endif
 
+sssd_pac_plugin_la_SOURCES = \
+    src/sss_client/sssd_pac.c \
+    src/sss_client/common.c \
+    src/sss_client/sss_cli.h \
+    src/sss_client/krb5_authdata_int.h
+sssd_pac_plugin_la_CFLAGS = \
+    $(AM_CFLAGS) \
+    $(KRB5_CFLAGS)
+sssd_pac_plugin_la_LDFLAGS = \
+    -lkrb5 \
+    -avoid-version \
+    -module
+
 if BUILD_PYTHON_BINDINGS
 pysss_la_SOURCES = \
     $(SSSD_TOOLS_OBJ) \
diff --git a/configure.ac b/configure.ac
index 7f2420902..0f5391bde 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,6 +90,7 @@ WITH_MANPAGES
 WITH_XML_CATALOG
 WITH_KRB5_PLUGIN_PATH
 WITH_KRB5_RCACHE_DIR
+WITH_KRB5AUTHDATA_PLUGIN_PATH
 WITH_PYTHON_BINDINGS
 WITH_SELINUX
 WITH_NSCD
diff --git a/src/conf_macros.m4 b/src/conf_macros.m4
index 2e98b84c2..a1da75302 100644
--- a/src/conf_macros.m4
+++ b/src/conf_macros.m4
@@ -277,6 +277,20 @@ AC_DEFUN([WITH_DEFAULT_CCNAME_TEMPLATE],
     AC_DEFINE_UNQUOTED(DEFAULT_CCNAME_TEMPLATE, "$config_def_ccname_template", [The default value of krb5_ccname_template])
   ])
 
+AC_DEFUN([WITH_KRB5AUTHDATA_PLUGIN_PATH],
+  [ AC_ARG_WITH([krb5authdata-plugin-path],
+                [AC_HELP_STRING([--with-krb5authdata-plugin-path=PATH],
+                                [Path to kerberos authdata plugin store [/usr/lib/krb5/plugins/authdata]]
+                               )
+                ]
+               )
+    krb5authdatapluginpath="${libdir}/krb5/plugins/authdata"
+    if test x"$with_krb5authdata_plugin_path" != x; then
+        krb5authdatapluginpath=$with_krb5authdata_plugin_path
+    fi
+    AC_SUBST(krb5authdatapluginpath)
+  ])
+
 AC_DEFUN([WITH_PYTHON_BINDINGS],
   [ AC_ARG_WITH([python-bindings],
                 [AC_HELP_STRING([--with-python-bindings],
diff --git a/src/sss_client/krb5_authdata_int.h b/src/sss_client/krb5_authdata_int.h
new file mode 100644
index 000000000..5e0cf5e02
--- /dev/null
+++ b/src/sss_client/krb5_authdata_int.h
@@ -0,0 +1,185 @@
+/*
+    SSSD - MIT Kerberos authdata plugin
+
+    This file contains definitions and declarations to build authdata plugins
+    for MIT Kerberos outside of the MIT Kerberos source tree.
+*/
+
+#ifndef _KRB5_AUTHDATA_INT_H
+#define _KRB5_AUTHDATA_INT_H
+
+krb5_error_code KRB5_CALLCONV
+krb5_ser_pack_int32(krb5_int32, krb5_octet **, size_t *);
+
+krb5_error_code KRB5_CALLCONV
+krb5_ser_unpack_int32(krb5_int32 *, krb5_octet **, size_t *);
+
+krb5_error_code KRB5_CALLCONV
+krb5_ser_pack_bytes(krb5_octet *, size_t, krb5_octet **, size_t *);
+
+#define AD_USAGE_AS_REQ         0x01
+#define AD_USAGE_TGS_REQ        0x02
+#define AD_USAGE_AP_REQ         0x04
+#define AD_USAGE_KDC_ISSUED     0x08
+#define AD_USAGE_MASK           0x0F
+#define AD_INFORMATIONAL        0x10
+
+struct _krb5_authdata_context;
+typedef struct _krb5_authdata_context *krb5_authdata_context;
+
+typedef void
+(*authdata_client_plugin_flags_proc)(krb5_context kcontext,
+                                     void *plugin_context,
+                                     krb5_authdatatype ad_type,
+                                     krb5_flags *flags);
+
+typedef krb5_error_code
+(*authdata_client_plugin_init_proc)(krb5_context context,
+                                    void **plugin_context);
+typedef void
+(*authdata_client_plugin_fini_proc)(krb5_context kcontext,
+                                    void *plugin_context);
+
+typedef krb5_error_code
+(*authdata_client_request_init_proc)(krb5_context kcontext,
+                                     struct _krb5_authdata_context *context,
+                                     void *plugin_context,
+                                     void **request_context);
+
+typedef void
+(*authdata_client_request_fini_proc)(krb5_context kcontext,
+                                     struct _krb5_authdata_context *context,
+                                     void *plugin_context,
+                                     void *request_context);
+
+typedef krb5_error_code
+(*authdata_client_import_authdata_proc)(krb5_context kcontext,
+                                        struct _krb5_authdata_context *context,
+                                        void *plugin_context,
+                                        void *request_context,
+                                        krb5_authdata **authdata,
+                                        krb5_boolean kdc_issued_flag,
+                                        krb5_const_principal issuer);
+
+typedef krb5_error_code
+(*authdata_client_export_authdata_proc)(krb5_context kcontext,
+                                        struct _krb5_authdata_context *context,
+                                        void *plugin_context,
+                                        void *request_context,
+                                        krb5_flags usage,
+                                        krb5_authdata ***authdata);
+
+typedef krb5_error_code
+(*authdata_client_get_attribute_types_proc)(krb5_context kcontext,
+                                            struct _krb5_authdata_context *context,
+                                            void *plugin_context,
+                                            void *request_context,
+                                            krb5_data **attrs);
+
+typedef krb5_error_code
+(*authdata_client_get_attribute_proc)(krb5_context kcontext,
+                                      struct _krb5_authdata_context *context,
+                                      void *plugin_context,
+                                      void *request_context,
+                                      const krb5_data *attribute,
+                                      krb5_boolean *authenticated,
+                                      krb5_boolean *complete,
+                                      krb5_data *value,
+                                      krb5_data *display_value,
+                                      int *more);
+
+typedef krb5_error_code
+(*authdata_client_set_attribute_proc)(krb5_context kcontext,
+                                      struct _krb5_authdata_context *context,
+                                      void *plugin_context,
+                                      void *request_context,
+                                      krb5_boolean complete,
+                                      const krb5_data *attribute,
+                                      const krb5_data *value);
+
+typedef krb5_error_code
+(*authdata_client_delete_attribute_proc)(krb5_context kcontext,
+                                         struct _krb5_authdata_context *context,
+                                         void *plugin_context,
+                                         void *request_context,
+                                         const krb5_data *attribute);
+
+typedef krb5_error_code
+(*authdata_client_export_internal_proc)(krb5_context kcontext,
+                                        struct _krb5_authdata_context *context,
+                                        void *plugin_context,
+                                        void *request_context,
+                                        krb5_boolean restrict_authenticated,
+                                        void **ptr);
+
+typedef void
+(*authdata_client_free_internal_proc)(krb5_context kcontext,
+                                      struct _krb5_authdata_context *context,
+                                      void *plugin_context,
+                                      void *request_context,
+                                      void *ptr);
+
+typedef krb5_error_code
+(*authdata_client_verify_proc)(krb5_context kcontext,
+                               struct _krb5_authdata_context *context,
+                               void *plugin_context,
+                               void *request_context,
+                               const krb5_auth_context *auth_context,
+                               const krb5_keyblock *key,
+                               const krb5_ap_req *req);
+
+typedef krb5_error_code
+(*authdata_client_size_proc)(krb5_context kcontext,
+                             struct _krb5_authdata_context *context,
+                             void *plugin_context,
+                             void *request_context,
+                             size_t *sizep);
+
+typedef krb5_error_code
+(*authdata_client_externalize_proc)(krb5_context kcontext,
+                                    struct _krb5_authdata_context *context,
+                                    void *plugin_context,
+                                    void *request_context,
+                                    krb5_octet **buffer,
+                                    size_t *lenremain);
+
+typedef krb5_error_code
+(*authdata_client_internalize_proc)(krb5_context kcontext,
+                                    struct _krb5_authdata_context *context,
+                                    void *plugin_context,
+                                    void *request_context,
+                                    krb5_octet **buffer,
+                                    size_t *lenremain);
+
+typedef krb5_error_code
+(*authdata_client_copy_proc)(krb5_context kcontext,
+                             struct _krb5_authdata_context *context,
+                             void *plugin_context,
+                             void *request_context,
+                             void *dst_plugin_context,
+                             void *dst_request_context);
+
+typedef struct krb5plugin_authdata_client_ftable_v0 {
+    char *name;
+    krb5_authdatatype *ad_type_list;
+    authdata_client_plugin_init_proc init;
+    authdata_client_plugin_fini_proc fini;
+    authdata_client_plugin_flags_proc flags;
+    authdata_client_request_init_proc request_init;
+    authdata_client_request_fini_proc request_fini;
+    authdata_client_get_attribute_types_proc get_attribute_types;
+    authdata_client_get_attribute_proc get_attribute;
+    authdata_client_set_attribute_proc set_attribute;
+    authdata_client_delete_attribute_proc delete_attribute;
+    authdata_client_export_authdata_proc export_authdata;
+    authdata_client_import_authdata_proc import_authdata;
+    authdata_client_export_internal_proc export_internal;
+    authdata_client_free_internal_proc free_internal;
+    authdata_client_verify_proc verify;
+    authdata_client_size_proc size;
+    authdata_client_externalize_proc externalize;
+    authdata_client_internalize_proc internalize;
+    authdata_client_copy_proc copy; /* optional */
+} krb5plugin_authdata_client_ftable_v0;
+
+#endif /* _KRB5_AUTHDATA_INT_H */
diff --git a/src/sss_client/sssd_pac.c b/src/sss_client/sssd_pac.c
new file mode 100644
index 000000000..cbcfe1d9e
--- /dev/null
+++ b/src/sss_client/sssd_pac.c
@@ -0,0 +1,282 @@
+/*
+    Authors:
+        Sumit Bose <sbose@redhat.com>
+
+    Copyright (C) 2011 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* A short documentation about authdata plugins can be found in
+ * http://http://k5wiki.kerberos.org/wiki/Projects/VerifyAuthData */
+
+#include <krb5/krb5.h>
+#include <errno.h>
+
+#include "krb5_authdata_int.h"
+#include "sss_cli.h"
+
+
+struct sssd_context {
+    krb5_data data;
+};
+
+static krb5_error_code
+sssdpac_init(krb5_context kcontext, void **plugin_context)
+{
+    *plugin_context = NULL;
+    return 0;
+}
+
+static void
+sssdpac_flags(krb5_context kcontext,
+              void *plugin_context,
+              krb5_authdatatype ad_type,
+              krb5_flags *flags)
+{
+    *flags = AD_USAGE_KDC_ISSUED | AD_INFORMATIONAL | AD_USAGE_TGS_REQ;
+}
+
+static void
+sssdpac_fini(krb5_context kcontext, void *plugin_context)
+{
+    return;
+}
+
+static krb5_error_code
+sssdpac_request_init(krb5_context kcontext,
+                     krb5_authdata_context context,
+                     void *plugin_context,
+                     void **request_context)
+{
+    struct sssd_context *sssdctx;
+
+    sssdctx = (struct sssd_context *)calloc(1, sizeof(*sssdctx));
+    if (sssdctx == NULL) {
+        return ENOMEM;
+    }
+
+    *request_context = sssdctx;
+
+    return 0;
+}
+
+static krb5_error_code
+sssdpac_import_authdata(krb5_context kcontext,
+                        krb5_authdata_context context,
+                        void *plugin_context,
+                        void *request_context,
+                        krb5_authdata **authdata,
+                        krb5_boolean kdc_issued,
+                        krb5_const_principal kdc_issuer)
+{
+    struct sss_cli_req_data sss_data;
+    int ret;
+    uint8_t *repbuf;
+    size_t replen;
+    int errnop;
+    char *data = NULL;
+    struct sssd_context *sssdctx = (struct sssd_context *)request_context;
+
+    if (authdata[0] == NULL) {
+        return EINVAL;
+    }
+
+    sss_data.len = authdata[0]->length;
+    sss_data.data = authdata[0]->contents;
+
+    ret = sss_pac_make_request(SSS_PAC_ADD_PAC_USER, &sss_data,
+                               &repbuf, &replen, &errnop);
+    if (ret != 0) {
+        /* Ignore the error */
+    }
+
+    if (authdata[0]->length > 0) {
+        data = malloc(sizeof(char) * authdata[0]->length);
+        if (data == NULL) {
+            return ENOMEM;
+        }
+        memcpy(data, authdata[0]->contents, authdata[0]->length);
+    }
+
+    if (sssdctx->data.data != NULL) {
+        krb5_free_data_contents(kcontext, &sssdctx->data);
+    }
+
+    sssdctx->data.length = authdata[0]->length;
+    sssdctx->data.data = data;
+    return 0;
+}
+
+static void
+sssdpac_request_fini(krb5_context kcontext,
+                     krb5_authdata_context context,
+                     void *plugin_context,
+                     void *request_context)
+{
+    struct sssd_context *sssdctx = (struct sssd_context *)request_context;
+
+    if (sssdctx != NULL) {
+        if (sssdctx->data.data != NULL) {
+            krb5_free_data_contents(kcontext, &sssdctx->data);
+        }
+
+        free(sssdctx);
+    }
+}
+
+static krb5_error_code
+sssdpac_size(krb5_context kcontext,
+             krb5_authdata_context context,
+             void *plugin_context,
+             void *request_context,
+             size_t *sizep)
+{
+    struct sssd_context *sssdctx = (struct sssd_context *)request_context;
+
+    *sizep += sizeof(krb5_int32);
+
+    *sizep += sssdctx->data.length;
+
+    *sizep += sizeof(krb5_int32);
+
+    return 0;
+}
+
+static krb5_error_code
+sssdpac_externalize(krb5_context kcontext,
+                    krb5_authdata_context context,
+                    void *plugin_context,
+                    void *request_context,
+                    krb5_octet **buffer,
+                    size_t *lenremain)
+{
+    krb5_error_code code = 0;
+    struct sssd_context *sssdctx = (struct sssd_context *)request_context;
+    size_t required = 0;
+    krb5_octet *bp;
+    size_t remain;
+
+    bp = *buffer;
+    remain = *lenremain;
+
+    if (sssdctx->data.data != NULL) {
+        sssdpac_size(kcontext, context, plugin_context,
+                   request_context, &required);
+
+        if (required <= remain) {
+            krb5_ser_pack_int32((krb5_int32)sssdctx->data.length,
+                                &bp, &remain);
+            krb5_ser_pack_bytes((krb5_octet *)sssdctx->data.data,
+                                (size_t)sssdctx->data.length,
+                                &bp, &remain);
+            krb5_ser_pack_int32(0,
+                                &bp, &remain);
+        } else {
+            code = ENOMEM;
+        }
+    } else {
+        krb5_ser_pack_int32(0, &bp, &remain); /* length */
+        krb5_ser_pack_int32(0, &bp, &remain); /* verified */
+    }
+
+    *buffer = bp;
+    *lenremain = remain;
+
+    return code;
+}
+
+static krb5_error_code
+sssdpac_internalize(krb5_context kcontext,
+                    krb5_authdata_context context,
+                    void *plugin_context,
+                    void *request_context,
+                    krb5_octet **buffer,
+                    size_t *lenremain)
+{
+    struct sssd_context *sssdctx = (struct sssd_context *)request_context;
+    krb5_error_code code;
+    krb5_int32 ibuf;
+    krb5_octet *bp;
+    size_t remain;
+    krb5_data data;
+
+    bp = *buffer;
+    remain = *lenremain;
+
+    /* length */
+    code = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
+    if (code != 0) {
+        return code;
+    }
+
+    if (ibuf != 0) {
+
+        data.length = ibuf;
+        data.data = malloc(sizeof(char) * ibuf);
+        if (data.data == NULL) {
+            return ENOMEM;
+        }
+        memcpy(data.data, bp, ibuf);
+
+        bp += ibuf;
+        remain -= ibuf;
+    } else {
+        data.length = 0;
+        data.data = NULL;
+    }
+
+    /* verified */
+    code = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
+    if (code != 0) {
+        return code;
+    }
+
+    if (sssdctx->data.data != NULL) {
+        krb5_free_data_contents(kcontext, &sssdctx->data);
+    }
+
+    sssdctx->data.length = data.length;
+    sssdctx->data.data = data.data;
+
+    *buffer = bp;
+    *lenremain = remain;
+
+    return 0;
+}
+
+static krb5_authdatatype sssdpac_ad_types[] = { KRB5_AUTHDATA_WIN2K_PAC, 0 };
+
+krb5plugin_authdata_client_ftable_v0 authdata_client_0 = {
+    ((void *)((uintptr_t)("sssd_sssdpac"))),
+    sssdpac_ad_types,
+    sssdpac_init,
+    sssdpac_fini,
+    sssdpac_flags,
+    sssdpac_request_init,
+    sssdpac_request_fini,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    sssdpac_import_authdata,
+    NULL,
+    NULL,
+    NULL,
+    sssdpac_size,
+    sssdpac_externalize,
+    sssdpac_internalize,
+    NULL
+};