gss_impl.c

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    1 /*-
    2  * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
    3  * Authors: Doug Rabson <dfr@rabson.org>
    4  * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.0/sys/kgssapi/gss_impl.c 184588 2008-11-03 10:38:00Z dfr $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/kobj.h>
   34 #include <sys/malloc.h>
   35 #include <sys/module.h>
   36 #include <sys/priv.h>
   37 #include <sys/syscall.h>
   38 #include <sys/sysent.h>
   39 #include <sys/sysproto.h>
   40 
   41 #include <kgssapi/gssapi.h>
   42 #include <kgssapi/gssapi_impl.h>
   43 #include <rpc/rpc.h>
   44 #include <rpc/rpc_com.h>
   45 
   46 #include "gssd.h"
   47 #include "kgss_if.h"
   48 
   49 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
   50 
   51 /*
   52  * Syscall hooks
   53  */
   54 static int gssd_syscall_offset = SYS_gssd_syscall;
   55 static struct sysent gssd_syscall_prev_sysent;
   56 MAKE_SYSENT(gssd_syscall);
   57 static bool_t gssd_syscall_registered = FALSE;
   58 
   59 struct kgss_mech_list kgss_mechs;
   60 CLIENT *kgss_gssd_handle;
   61 
   62 static void
   63 kgss_init(void *dummy)
   64 {
   65         int error;
   66 
   67         LIST_INIT(&kgss_mechs);
   68         error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent,
   69             &gssd_syscall_prev_sysent);
   70         if (error)
   71                 printf("Can't register GSSD syscall\n");
   72         else
   73                 gssd_syscall_registered = TRUE;
   74 }
   75 SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL);
   76 
   77 static void
   78 kgss_uninit(void *dummy)
   79 {
   80 
   81         if (gssd_syscall_registered)
   82                 syscall_deregister(&gssd_syscall_offset,
   83                     &gssd_syscall_prev_sysent);
   84 }
   85 SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL);
   86 
   87 int
   88 gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
   89 {
   90         struct sockaddr_un sun;
   91         struct netconfig *nconf;
   92         char path[MAXPATHLEN];
   93         int error;
   94         
   95         error = priv_check(td, PRIV_NFS_DAEMON);
   96         if (error)
   97                 return (error);
   98 
   99         if (kgss_gssd_handle)
  100                 CLNT_DESTROY(kgss_gssd_handle);
  101 
  102         error = copyinstr(uap->path, path, sizeof(path), NULL);
  103         if (error)
  104                 return (error);
  105 
  106         sun.sun_family = AF_LOCAL;
  107         strcpy(sun.sun_path, path);
  108         sun.sun_len = SUN_LEN(&sun);
  109         
  110         nconf = getnetconfigent("local");
  111         kgss_gssd_handle = clnt_reconnect_create(nconf,
  112             (struct sockaddr *) &sun, GSSD, GSSDVERS,
  113             RPC_MAXDATASIZE, RPC_MAXDATASIZE);
  114 
  115         return (0);
  116 }
  117 
  118 int
  119 kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
  120 {
  121 
  122         if (oid1 == oid2)
  123                 return (1);
  124         if (!oid1 || !oid2)
  125                 return (0);
  126         if (oid1->length != oid2->length)
  127                 return (0);
  128         if (memcmp(oid1->elements, oid2->elements, oid1->length))
  129                 return (0);
  130         return (1);
  131 }
  132 
  133 void
  134 kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
  135 {
  136         struct kgss_mech *km;
  137 
  138         km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
  139         km->km_mech_type = mech_type;
  140         km->km_mech_name = name;
  141         km->km_class = cls;
  142         LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
  143 }
  144 
  145 void
  146 kgss_uninstall_mech(gss_OID mech_type)
  147 {
  148         struct kgss_mech *km;
  149 
  150         LIST_FOREACH(km, &kgss_mechs, km_link) {
  151                 if (kgss_oid_equal(km->km_mech_type, mech_type)) {
  152                         LIST_REMOVE(km, km_link);
  153                         free(km, M_GSSAPI);
  154                         return;
  155                 }
  156         }
  157 }
  158 
  159 gss_OID
  160 kgss_find_mech_by_name(const char *name)
  161 {
  162         struct kgss_mech *km;
  163 
  164         LIST_FOREACH(km, &kgss_mechs, km_link) {
  165                 if (!strcmp(km->km_mech_name, name)) {
  166                         return (km->km_mech_type);
  167                 }
  168         }
  169         return (GSS_C_NO_OID);
  170 }
  171 
  172 const char *
  173 kgss_find_mech_by_oid(const gss_OID oid)
  174 {
  175         struct kgss_mech *km;
  176 
  177         LIST_FOREACH(km, &kgss_mechs, km_link) {
  178                 if (kgss_oid_equal(km->km_mech_type, oid)) {
  179                         return (km->km_mech_name);
  180                 }
  181         }
  182         return (NULL);
  183 }
  184 
  185 gss_ctx_id_t
  186 kgss_create_context(gss_OID mech_type)
  187 {
  188         struct kgss_mech *km;
  189         gss_ctx_id_t ctx;
  190 
  191         LIST_FOREACH(km, &kgss_mechs, km_link) {
  192                 if (kgss_oid_equal(km->km_mech_type, mech_type))
  193                         break;
  194         }
  195         if (!km)
  196                 return (NULL);
  197 
  198         ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
  199         KGSS_INIT(ctx);
  200 
  201         return (ctx);
  202 }
  203 
  204 void
  205 kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
  206 {
  207 
  208         KGSS_DELETE(ctx, output_token);
  209         kobj_delete((kobj_t) ctx, M_GSSAPI);
  210 }
  211 
  212 OM_uint32
  213 kgss_transfer_context(gss_ctx_id_t ctx)
  214 {
  215         struct export_sec_context_res res;
  216         struct export_sec_context_args args;
  217         enum clnt_stat stat;
  218         OM_uint32 maj_stat;
  219 
  220         if (!kgss_gssd_handle)
  221                 return (GSS_S_FAILURE);
  222 
  223         args.ctx = ctx->handle;
  224         bzero(&res, sizeof(res));
  225         stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
  226         if (stat != RPC_SUCCESS) {
  227                 return (GSS_S_FAILURE);
  228         }
  229 
  230         maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
  231         ctx->handle = 0;
  232 
  233         xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
  234 
  235         return (maj_stat);
  236 }
  237 
  238 void
  239 kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
  240 {
  241         to->length = from->length;
  242         if (from->length) {
  243                 to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
  244                 bcopy(from->value, to->value, from->length);
  245         } else {
  246                 to->value = NULL;
  247         }
  248 }
  249 
  250 /*
  251  * Kernel module glue
  252  */
  253 static int
  254 kgssapi_modevent(module_t mod, int type, void *data)
  255 {
  256 
  257         return (0);
  258 }
  259 static moduledata_t kgssapi_mod = {
  260         "kgssapi",
  261         kgssapi_modevent,
  262         NULL,
  263 };
  264 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
  265 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
  266 MODULE_VERSION(kgssapi, 1);

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FreeBSD/Linux Kernel Cross Reference sys/kgssapi/gss_impl.c

FreeBSD/Linux Kernel Cross Reference
sys/kgssapi/gss_impl.c