The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kgssapi/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: stable/10/sys/kgssapi/gss_impl.c 299617 2016-05-13 08:25:06Z ngie $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/kobj.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 #include <sys/mutex.h>
   38 #include <sys/priv.h>
   39 #include <sys/syscall.h>
   40 #include <sys/sysent.h>
   41 #include <sys/sysproto.h>
   42 
   43 #include <kgssapi/gssapi.h>
   44 #include <kgssapi/gssapi_impl.h>
   45 #include <rpc/rpc.h>
   46 #include <rpc/rpc_com.h>
   47 #include <rpc/rpcsec_gss.h>
   48 
   49 #include "gssd.h"
   50 #include "kgss_if.h"
   51 
   52 MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
   53 
   54 /*
   55  * Syscall hooks
   56  */
   57 static int gssd_syscall_offset = SYS_gssd_syscall;
   58 static struct sysent gssd_syscall_prev_sysent;
   59 MAKE_SYSENT(gssd_syscall);
   60 static bool_t gssd_syscall_registered = FALSE;
   61 
   62 struct kgss_mech_list kgss_mechs;
   63 CLIENT *kgss_gssd_handle;
   64 struct mtx kgss_gssd_lock;
   65 
   66 static void
   67 kgss_init(void *dummy)
   68 {
   69         int error;
   70 
   71         LIST_INIT(&kgss_mechs);
   72         error = syscall_register(&gssd_syscall_offset, &gssd_syscall_sysent,
   73             &gssd_syscall_prev_sysent);
   74         if (error)
   75                 printf("Can't register GSSD syscall\n");
   76         else
   77                 gssd_syscall_registered = TRUE;
   78 }
   79 SYSINIT(kgss_init, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_init, NULL);
   80 
   81 static void
   82 kgss_uninit(void *dummy)
   83 {
   84 
   85         if (gssd_syscall_registered)
   86                 syscall_deregister(&gssd_syscall_offset,
   87                     &gssd_syscall_prev_sysent);
   88 }
   89 SYSUNINIT(kgss_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, kgss_uninit, NULL);
   90 
   91 int
   92 sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
   93 {
   94         struct sockaddr_un sun;
   95         struct netconfig *nconf;
   96         char path[MAXPATHLEN];
   97         int error;
   98         CLIENT *cl, *oldcl;
   99         
  100         error = priv_check(td, PRIV_NFS_DAEMON);
  101         if (error)
  102                 return (error);
  103 
  104         error = copyinstr(uap->path, path, sizeof(path), NULL);
  105         if (error)
  106                 return (error);
  107         if (strlen(path) + 1 > sizeof(sun.sun_path))
  108                 return (EINVAL);
  109 
  110         if (path[0] != '\0') {
  111                 sun.sun_family = AF_LOCAL;
  112                 strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
  113                 sun.sun_len = SUN_LEN(&sun);
  114                 
  115                 nconf = getnetconfigent("local");
  116                 cl = clnt_reconnect_create(nconf,
  117                     (struct sockaddr *) &sun, GSSD, GSSDVERS,
  118                     RPC_MAXDATASIZE, RPC_MAXDATASIZE);
  119         } else
  120                 cl = NULL;
  121 
  122         mtx_lock(&kgss_gssd_lock);
  123         oldcl = kgss_gssd_handle;
  124         kgss_gssd_handle = cl;
  125         mtx_unlock(&kgss_gssd_lock);
  126 
  127         if (oldcl != NULL) {
  128                 CLNT_CLOSE(oldcl);
  129                 CLNT_RELEASE(oldcl);
  130         }
  131 
  132         return (0);
  133 }
  134 
  135 int
  136 kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
  137 {
  138 
  139         if (oid1 == oid2)
  140                 return (1);
  141         if (!oid1 || !oid2)
  142                 return (0);
  143         if (oid1->length != oid2->length)
  144                 return (0);
  145         if (memcmp(oid1->elements, oid2->elements, oid1->length))
  146                 return (0);
  147         return (1);
  148 }
  149 
  150 void
  151 kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
  152 {
  153         struct kgss_mech *km;
  154 
  155         km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
  156         km->km_mech_type = mech_type;
  157         km->km_mech_name = name;
  158         km->km_class = cls;
  159         LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
  160 }
  161 
  162 void
  163 kgss_uninstall_mech(gss_OID mech_type)
  164 {
  165         struct kgss_mech *km;
  166 
  167         LIST_FOREACH(km, &kgss_mechs, km_link) {
  168                 if (kgss_oid_equal(km->km_mech_type, mech_type)) {
  169                         LIST_REMOVE(km, km_link);
  170                         free(km, M_GSSAPI);
  171                         return;
  172                 }
  173         }
  174 }
  175 
  176 gss_OID
  177 kgss_find_mech_by_name(const char *name)
  178 {
  179         struct kgss_mech *km;
  180 
  181         LIST_FOREACH(km, &kgss_mechs, km_link) {
  182                 if (!strcmp(km->km_mech_name, name)) {
  183                         return (km->km_mech_type);
  184                 }
  185         }
  186         return (GSS_C_NO_OID);
  187 }
  188 
  189 const char *
  190 kgss_find_mech_by_oid(const gss_OID oid)
  191 {
  192         struct kgss_mech *km;
  193 
  194         LIST_FOREACH(km, &kgss_mechs, km_link) {
  195                 if (kgss_oid_equal(km->km_mech_type, oid)) {
  196                         return (km->km_mech_name);
  197                 }
  198         }
  199         return (NULL);
  200 }
  201 
  202 gss_ctx_id_t
  203 kgss_create_context(gss_OID mech_type)
  204 {
  205         struct kgss_mech *km;
  206         gss_ctx_id_t ctx;
  207 
  208         LIST_FOREACH(km, &kgss_mechs, km_link) {
  209                 if (kgss_oid_equal(km->km_mech_type, mech_type))
  210                         break;
  211         }
  212         if (!km)
  213                 return (NULL);
  214 
  215         ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
  216         KGSS_INIT(ctx);
  217 
  218         return (ctx);
  219 }
  220 
  221 void
  222 kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
  223 {
  224 
  225         KGSS_DELETE(ctx, output_token);
  226         kobj_delete((kobj_t) ctx, M_GSSAPI);
  227 }
  228 
  229 OM_uint32
  230 kgss_transfer_context(gss_ctx_id_t ctx)
  231 {
  232         struct export_sec_context_res res;
  233         struct export_sec_context_args args;
  234         enum clnt_stat stat;
  235         OM_uint32 maj_stat;
  236 
  237         if (!kgss_gssd_handle)
  238                 return (GSS_S_FAILURE);
  239 
  240         args.ctx = ctx->handle;
  241         bzero(&res, sizeof(res));
  242         stat = gssd_export_sec_context_1(&args, &res, kgss_gssd_handle);
  243         if (stat != RPC_SUCCESS) {
  244                 return (GSS_S_FAILURE);
  245         }
  246 
  247         maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
  248         ctx->handle = 0;
  249 
  250         xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
  251 
  252         return (maj_stat);
  253 }
  254 
  255 void
  256 kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
  257 {
  258         to->length = from->length;
  259         if (from->length) {
  260                 to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
  261                 bcopy(from->value, to->value, from->length);
  262         } else {
  263                 to->value = NULL;
  264         }
  265 }
  266 
  267 /*
  268  * Acquire the kgss_gssd_handle and return it with a reference count,
  269  * if it is available.
  270  */
  271 CLIENT *
  272 kgss_gssd_client(void)
  273 {
  274         CLIENT *cl;
  275 
  276         mtx_lock(&kgss_gssd_lock);
  277         cl = kgss_gssd_handle;
  278         if (cl != NULL)
  279                 CLNT_ACQUIRE(cl);
  280         mtx_unlock(&kgss_gssd_lock);
  281         return (cl);
  282 }
  283 
  284 /*
  285  * Kernel module glue
  286  */
  287 static int
  288 kgssapi_modevent(module_t mod, int type, void *data)
  289 {
  290         int error = 0;
  291 
  292         switch (type) {
  293         case MOD_LOAD:
  294                 rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth;
  295                 rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
  296                 rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
  297                 rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
  298                 rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
  299                 rpc_gss_entries.rpc_gss_max_data_length =
  300                     rpc_gss_max_data_length;
  301                 rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
  302                 rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
  303                 rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
  304                 rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
  305                 rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
  306                 rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
  307                 rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
  308                 rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
  309                 rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
  310                 rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
  311                 rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
  312                 rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
  313                 rpc_gss_entries.rpc_gss_get_principal_name =
  314                     rpc_gss_get_principal_name;
  315                 rpc_gss_entries.rpc_gss_svc_max_data_length =
  316                     rpc_gss_svc_max_data_length;
  317                 mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
  318                 break;
  319         case MOD_UNLOAD:
  320                 /*
  321                  * Unloading of the kgssapi module is not currently supported.
  322                  * If somebody wants this, we would need to keep track of
  323                  * currently executing threads and make sure the count is 0.
  324                  */
  325                 /* FALLTHROUGH */
  326         default:
  327                 error = EOPNOTSUPP;
  328         };
  329         return (error);
  330 }
  331 static moduledata_t kgssapi_mod = {
  332         "kgssapi",
  333         kgssapi_modevent,
  334         NULL,
  335 };
  336 DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
  337 MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
  338 MODULE_VERSION(kgssapi, 1);

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