367 lines
9.1 KiB
C
367 lines
9.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Authors: Doug Rabson <dfr@rabson.org>
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* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/kobj.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <kgssapi/gssapi.h>
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#include <kgssapi/gssapi_impl.h>
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#include <rpc/rpc.h>
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#include <rpc/rpc_com.h>
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#include <rpc/rpcsec_gss.h>
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#include "gssd.h"
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#include "kgss_if.h"
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MALLOC_DEFINE(M_GSSAPI, "GSS-API", "GSS-API");
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/*
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* Syscall hooks
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*/
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static struct syscall_helper_data gssd_syscalls[] = {
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SYSCALL_INIT_HELPER(gssd_syscall),
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SYSCALL_INIT_LAST
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};
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struct kgss_mech_list kgss_mechs;
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struct mtx kgss_gssd_lock;
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KGSS_VNET_DEFINE(CLIENT *, kgss_gssd_handle) = NULL;
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static int
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kgss_load(void)
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{
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int error;
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LIST_INIT(&kgss_mechs);
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error = syscall_helper_register(gssd_syscalls, SY_THR_STATIC_KLD);
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if (error != 0)
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return (error);
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return (0);
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}
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static void
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kgss_unload(void)
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{
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syscall_helper_unregister(gssd_syscalls);
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}
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int
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sys_gssd_syscall(struct thread *td, struct gssd_syscall_args *uap)
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{
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struct sockaddr_un sun;
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struct netconfig *nconf;
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char path[MAXPATHLEN];
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int error;
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CLIENT *cl, *oldcl;
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error = priv_check(td, PRIV_NFS_DAEMON);
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if (error)
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return (error);
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error = copyinstr(uap->path, path, sizeof(path), NULL);
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if (error)
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return (error);
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if (strlen(path) + 1 > sizeof(sun.sun_path))
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return (EINVAL);
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if (path[0] != '\0') {
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sun.sun_family = AF_LOCAL;
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strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
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sun.sun_len = SUN_LEN(&sun);
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nconf = getnetconfigent("local");
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cl = clnt_reconnect_create(nconf,
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(struct sockaddr *) &sun, GSSD, GSSDVERS,
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RPC_MAXDATASIZE, RPC_MAXDATASIZE);
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/*
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* The number of retries defaults to INT_MAX, which effectively
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* means an infinite, uninterruptable loop. Limiting it to
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* five retries keeps it from running forever.
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*/
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if (cl != NULL) {
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int retry_count = 5;
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struct timeval timo;
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CLNT_CONTROL(cl, CLSET_RETRIES, &retry_count);
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/*
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* Set the timeout for an upcall to 5 minutes. The
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* default of 25 seconds is not long enough for some
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* gss_XXX() calls done by the gssd(8) daemon.
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*/
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timo.tv_sec = 5 * 60;
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timo.tv_usec = 0;
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CLNT_CONTROL(cl, CLSET_TIMEOUT, &timo);
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}
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} else
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cl = NULL;
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KGSS_CURVNET_SET_QUIET(KGSS_TD_TO_VNET(curthread));
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mtx_lock(&kgss_gssd_lock);
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oldcl = KGSS_VNET(kgss_gssd_handle);
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KGSS_VNET(kgss_gssd_handle) = cl;
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mtx_unlock(&kgss_gssd_lock);
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KGSS_CURVNET_RESTORE();
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if (oldcl != NULL) {
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CLNT_CLOSE(oldcl);
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CLNT_RELEASE(oldcl);
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}
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return (0);
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}
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int
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kgss_oid_equal(const gss_OID oid1, const gss_OID oid2)
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{
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if (oid1 == oid2)
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return (1);
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if (!oid1 || !oid2)
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return (0);
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if (oid1->length != oid2->length)
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return (0);
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if (memcmp(oid1->elements, oid2->elements, oid1->length))
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return (0);
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return (1);
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}
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void
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kgss_install_mech(gss_OID mech_type, const char *name, struct kobj_class *cls)
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{
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struct kgss_mech *km;
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km = malloc(sizeof(struct kgss_mech), M_GSSAPI, M_WAITOK);
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km->km_mech_type = mech_type;
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km->km_mech_name = name;
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km->km_class = cls;
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LIST_INSERT_HEAD(&kgss_mechs, km, km_link);
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}
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void
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kgss_uninstall_mech(gss_OID mech_type)
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{
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struct kgss_mech *km;
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LIST_FOREACH(km, &kgss_mechs, km_link) {
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if (kgss_oid_equal(km->km_mech_type, mech_type)) {
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LIST_REMOVE(km, km_link);
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free(km, M_GSSAPI);
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return;
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}
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}
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}
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gss_OID
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kgss_find_mech_by_name(const char *name)
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{
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struct kgss_mech *km;
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LIST_FOREACH(km, &kgss_mechs, km_link) {
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if (!strcmp(km->km_mech_name, name)) {
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return (km->km_mech_type);
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}
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}
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return (GSS_C_NO_OID);
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}
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const char *
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kgss_find_mech_by_oid(const gss_OID oid)
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{
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struct kgss_mech *km;
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LIST_FOREACH(km, &kgss_mechs, km_link) {
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if (kgss_oid_equal(km->km_mech_type, oid)) {
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return (km->km_mech_name);
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}
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}
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return (NULL);
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}
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gss_ctx_id_t
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kgss_create_context(gss_OID mech_type)
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{
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struct kgss_mech *km;
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gss_ctx_id_t ctx;
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LIST_FOREACH(km, &kgss_mechs, km_link) {
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if (kgss_oid_equal(km->km_mech_type, mech_type))
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break;
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}
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if (!km)
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return (NULL);
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ctx = (gss_ctx_id_t) kobj_create(km->km_class, M_GSSAPI, M_WAITOK);
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KGSS_INIT(ctx);
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return (ctx);
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}
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void
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kgss_delete_context(gss_ctx_id_t ctx, gss_buffer_t output_token)
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{
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KGSS_DELETE(ctx, output_token);
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kobj_delete((kobj_t) ctx, M_GSSAPI);
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}
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OM_uint32
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kgss_transfer_context(gss_ctx_id_t ctx)
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{
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struct export_sec_context_res res;
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struct export_sec_context_args args;
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enum clnt_stat stat;
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OM_uint32 maj_stat;
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KGSS_CURVNET_SET_QUIET(KGSS_TD_TO_VNET(curthread));
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if (!KGSS_VNET(kgss_gssd_handle)) {
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KGSS_CURVNET_RESTORE();
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return (GSS_S_FAILURE);
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}
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args.ctx = ctx->handle;
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bzero(&res, sizeof(res));
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stat = gssd_export_sec_context_1(&args, &res, KGSS_VNET(kgss_gssd_handle));
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KGSS_CURVNET_RESTORE();
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if (stat != RPC_SUCCESS) {
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return (GSS_S_FAILURE);
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}
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maj_stat = KGSS_IMPORT(ctx, res.format, &res.interprocess_token);
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ctx->handle = 0;
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xdr_free((xdrproc_t) xdr_export_sec_context_res, &res);
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return (maj_stat);
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}
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void
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kgss_copy_buffer(const gss_buffer_t from, gss_buffer_t to)
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{
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to->length = from->length;
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if (from->length) {
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to->value = malloc(from->length, M_GSSAPI, M_WAITOK);
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bcopy(from->value, to->value, from->length);
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} else {
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to->value = NULL;
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}
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}
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/*
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* Acquire the kgss_gssd_handle and return it with a reference count,
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* if it is available.
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*/
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CLIENT *
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kgss_gssd_client(void)
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{
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CLIENT *cl;
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KGSS_CURVNET_SET_QUIET(KGSS_TD_TO_VNET(curthread));
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mtx_lock(&kgss_gssd_lock);
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cl = KGSS_VNET(kgss_gssd_handle);
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if (cl != NULL)
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CLNT_ACQUIRE(cl);
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mtx_unlock(&kgss_gssd_lock);
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KGSS_CURVNET_RESTORE();
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return (cl);
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}
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/*
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* Kernel module glue
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*/
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static int
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kgssapi_modevent(module_t mod, int type, void *data)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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rpc_gss_entries.rpc_gss_refresh_auth = rpc_gss_refresh_auth;
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rpc_gss_entries.rpc_gss_secfind = rpc_gss_secfind;
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rpc_gss_entries.rpc_gss_secpurge = rpc_gss_secpurge;
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rpc_gss_entries.rpc_gss_seccreate = rpc_gss_seccreate;
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rpc_gss_entries.rpc_gss_set_defaults = rpc_gss_set_defaults;
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rpc_gss_entries.rpc_gss_max_data_length =
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rpc_gss_max_data_length;
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rpc_gss_entries.rpc_gss_get_error = rpc_gss_get_error;
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rpc_gss_entries.rpc_gss_mech_to_oid = rpc_gss_mech_to_oid;
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rpc_gss_entries.rpc_gss_oid_to_mech = rpc_gss_oid_to_mech;
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rpc_gss_entries.rpc_gss_qop_to_num = rpc_gss_qop_to_num;
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rpc_gss_entries.rpc_gss_get_mechanisms = rpc_gss_get_mechanisms;
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rpc_gss_entries.rpc_gss_get_versions = rpc_gss_get_versions;
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rpc_gss_entries.rpc_gss_is_installed = rpc_gss_is_installed;
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rpc_gss_entries.rpc_gss_set_svc_name = rpc_gss_set_svc_name;
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rpc_gss_entries.rpc_gss_clear_svc_name = rpc_gss_clear_svc_name;
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rpc_gss_entries.rpc_gss_getcred = rpc_gss_getcred;
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rpc_gss_entries.rpc_gss_set_callback = rpc_gss_set_callback;
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rpc_gss_entries.rpc_gss_clear_callback = rpc_gss_clear_callback;
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rpc_gss_entries.rpc_gss_get_principal_name =
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rpc_gss_get_principal_name;
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rpc_gss_entries.rpc_gss_svc_max_data_length =
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rpc_gss_svc_max_data_length;
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mtx_init(&kgss_gssd_lock, "kgss_gssd_lock", NULL, MTX_DEF);
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error = kgss_load();
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break;
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case MOD_UNLOAD:
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kgss_unload();
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mtx_destroy(&kgss_gssd_lock);
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/*
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* Unloading of the kgssapi module is not currently supported.
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* If somebody wants this, we would need to keep track of
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* currently executing threads and make sure the count is 0.
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*/
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/* FALLTHROUGH */
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default:
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error = EOPNOTSUPP;
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}
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return (error);
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}
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static moduledata_t kgssapi_mod = {
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"kgssapi",
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kgssapi_modevent,
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NULL,
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};
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DECLARE_MODULE(kgssapi, kgssapi_mod, SI_SUB_VFS, SI_ORDER_ANY);
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MODULE_DEPEND(kgssapi, xdr, 1, 1, 1);
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MODULE_DEPEND(kgssapi, krpc, 1, 1, 1);
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MODULE_VERSION(kgssapi, 1);
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