mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:56:48 +07:00
414ca017a5
The principal name on a gss cred is used to setup the NFSv4.0 callback, which has to have a client principal name to authenticate to. That code wants the name to be in the form servicetype@hostname. rpc.svcgssd passes down such names (and passes down no principal name at all in the case the principal isn't a service principal). gss-proxy always passes down the principal name, and passes it down in the form servicetype/hostname@REALM. So we've been munging the name gss-proxy passes down into the format the NFSv4.0 callback code expects, or throwing away the name if we can't. Since the introduction of the MACH_CRED enforcement in NFSv4.1, we've also been using the principal name to verify that certain operations are done as the same principal as was used on the original EXCHANGE_ID call. For that application, the original name passed down by gss-proxy is also useful. Lack of that name in some cases was causing some kerberized NFSv4.1 mount failures in an Active Directory environment. This fix only works in the gss-proxy case. The fix for legacy rpc.svcgssd would be more involved, and rpc.svcgssd already has other problems in the AD case. Reported-and-tested-by: James Ralston <ralston@pobox.com> Acked-by: Simo Sorce <simo@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
388 lines
9.5 KiB
C
388 lines
9.5 KiB
C
/*
|
|
* linux/net/sunrpc/gss_rpc_upcall.c
|
|
*
|
|
* Copyright (C) 2012 Simo Sorce <simo@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/un.h>
|
|
|
|
#include <linux/sunrpc/svcauth.h>
|
|
#include "gss_rpc_upcall.h"
|
|
|
|
#define GSSPROXY_SOCK_PATHNAME "/var/run/gssproxy.sock"
|
|
|
|
#define GSSPROXY_PROGRAM (400112u)
|
|
#define GSSPROXY_VERS_1 (1u)
|
|
|
|
/*
|
|
* Encoding/Decoding functions
|
|
*/
|
|
|
|
enum {
|
|
GSSX_NULL = 0, /* Unused */
|
|
GSSX_INDICATE_MECHS = 1,
|
|
GSSX_GET_CALL_CONTEXT = 2,
|
|
GSSX_IMPORT_AND_CANON_NAME = 3,
|
|
GSSX_EXPORT_CRED = 4,
|
|
GSSX_IMPORT_CRED = 5,
|
|
GSSX_ACQUIRE_CRED = 6,
|
|
GSSX_STORE_CRED = 7,
|
|
GSSX_INIT_SEC_CONTEXT = 8,
|
|
GSSX_ACCEPT_SEC_CONTEXT = 9,
|
|
GSSX_RELEASE_HANDLE = 10,
|
|
GSSX_GET_MIC = 11,
|
|
GSSX_VERIFY = 12,
|
|
GSSX_WRAP = 13,
|
|
GSSX_UNWRAP = 14,
|
|
GSSX_WRAP_SIZE_LIMIT = 15,
|
|
};
|
|
|
|
#define PROC(proc, name) \
|
|
[GSSX_##proc] = { \
|
|
.p_proc = GSSX_##proc, \
|
|
.p_encode = (kxdreproc_t)gssx_enc_##name, \
|
|
.p_decode = (kxdrdproc_t)gssx_dec_##name, \
|
|
.p_arglen = GSSX_ARG_##name##_sz, \
|
|
.p_replen = GSSX_RES_##name##_sz, \
|
|
.p_statidx = GSSX_##proc, \
|
|
.p_name = #proc, \
|
|
}
|
|
|
|
static struct rpc_procinfo gssp_procedures[] = {
|
|
PROC(INDICATE_MECHS, indicate_mechs),
|
|
PROC(GET_CALL_CONTEXT, get_call_context),
|
|
PROC(IMPORT_AND_CANON_NAME, import_and_canon_name),
|
|
PROC(EXPORT_CRED, export_cred),
|
|
PROC(IMPORT_CRED, import_cred),
|
|
PROC(ACQUIRE_CRED, acquire_cred),
|
|
PROC(STORE_CRED, store_cred),
|
|
PROC(INIT_SEC_CONTEXT, init_sec_context),
|
|
PROC(ACCEPT_SEC_CONTEXT, accept_sec_context),
|
|
PROC(RELEASE_HANDLE, release_handle),
|
|
PROC(GET_MIC, get_mic),
|
|
PROC(VERIFY, verify),
|
|
PROC(WRAP, wrap),
|
|
PROC(UNWRAP, unwrap),
|
|
PROC(WRAP_SIZE_LIMIT, wrap_size_limit),
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
* Common transport functions
|
|
*/
|
|
|
|
static const struct rpc_program gssp_program;
|
|
|
|
static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt)
|
|
{
|
|
static const struct sockaddr_un gssp_localaddr = {
|
|
.sun_family = AF_LOCAL,
|
|
.sun_path = GSSPROXY_SOCK_PATHNAME,
|
|
};
|
|
struct rpc_create_args args = {
|
|
.net = net,
|
|
.protocol = XPRT_TRANSPORT_LOCAL,
|
|
.address = (struct sockaddr *)&gssp_localaddr,
|
|
.addrsize = sizeof(gssp_localaddr),
|
|
.servername = "localhost",
|
|
.program = &gssp_program,
|
|
.version = GSSPROXY_VERS_1,
|
|
.authflavor = RPC_AUTH_NULL,
|
|
/*
|
|
* Note we want connection to be done in the caller's
|
|
* filesystem namespace. We therefore turn off the idle
|
|
* timeout, which would result in reconnections being
|
|
* done without the correct namespace:
|
|
*/
|
|
.flags = RPC_CLNT_CREATE_NOPING |
|
|
RPC_CLNT_CREATE_NO_IDLE_TIMEOUT
|
|
};
|
|
struct rpc_clnt *clnt;
|
|
int result = 0;
|
|
|
|
clnt = rpc_create(&args);
|
|
if (IS_ERR(clnt)) {
|
|
dprintk("RPC: failed to create AF_LOCAL gssproxy "
|
|
"client (errno %ld).\n", PTR_ERR(clnt));
|
|
result = PTR_ERR(clnt);
|
|
*_clnt = NULL;
|
|
goto out;
|
|
}
|
|
|
|
dprintk("RPC: created new gssp local client (gssp_local_clnt: "
|
|
"%p)\n", clnt);
|
|
*_clnt = clnt;
|
|
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
void init_gssp_clnt(struct sunrpc_net *sn)
|
|
{
|
|
mutex_init(&sn->gssp_lock);
|
|
sn->gssp_clnt = NULL;
|
|
}
|
|
|
|
int set_gssp_clnt(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct rpc_clnt *clnt;
|
|
int ret;
|
|
|
|
mutex_lock(&sn->gssp_lock);
|
|
ret = gssp_rpc_create(net, &clnt);
|
|
if (!ret) {
|
|
if (sn->gssp_clnt)
|
|
rpc_shutdown_client(sn->gssp_clnt);
|
|
sn->gssp_clnt = clnt;
|
|
}
|
|
mutex_unlock(&sn->gssp_lock);
|
|
return ret;
|
|
}
|
|
|
|
void clear_gssp_clnt(struct sunrpc_net *sn)
|
|
{
|
|
mutex_lock(&sn->gssp_lock);
|
|
if (sn->gssp_clnt) {
|
|
rpc_shutdown_client(sn->gssp_clnt);
|
|
sn->gssp_clnt = NULL;
|
|
}
|
|
mutex_unlock(&sn->gssp_lock);
|
|
}
|
|
|
|
static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn)
|
|
{
|
|
struct rpc_clnt *clnt;
|
|
|
|
mutex_lock(&sn->gssp_lock);
|
|
clnt = sn->gssp_clnt;
|
|
if (clnt)
|
|
atomic_inc(&clnt->cl_count);
|
|
mutex_unlock(&sn->gssp_lock);
|
|
return clnt;
|
|
}
|
|
|
|
static int gssp_call(struct net *net, struct rpc_message *msg)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct rpc_clnt *clnt;
|
|
int status;
|
|
|
|
clnt = get_gssp_clnt(sn);
|
|
if (!clnt)
|
|
return -EIO;
|
|
status = rpc_call_sync(clnt, msg, 0);
|
|
if (status < 0) {
|
|
dprintk("gssp: rpc_call returned error %d\n", -status);
|
|
switch (status) {
|
|
case -EPROTONOSUPPORT:
|
|
status = -EINVAL;
|
|
break;
|
|
case -ECONNREFUSED:
|
|
case -ETIMEDOUT:
|
|
case -ENOTCONN:
|
|
status = -EAGAIN;
|
|
break;
|
|
case -ERESTARTSYS:
|
|
if (signalled ())
|
|
status = -EINTR;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
rpc_release_client(clnt);
|
|
return status;
|
|
}
|
|
|
|
static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < arg->npages && arg->pages[i]; i++)
|
|
__free_page(arg->pages[i]);
|
|
|
|
kfree(arg->pages);
|
|
}
|
|
|
|
static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
|
|
{
|
|
arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
|
|
arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL);
|
|
/*
|
|
* XXX: actual pages are allocated by xdr layer in
|
|
* xdr_partial_copy_from_skb.
|
|
*/
|
|
if (!arg->pages)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Public functions
|
|
*/
|
|
|
|
/* numbers somewhat arbitrary but large enough for current needs */
|
|
#define GSSX_MAX_OUT_HANDLE 128
|
|
#define GSSX_MAX_SRC_PRINC 256
|
|
#define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \
|
|
GSSX_max_oid_sz + \
|
|
GSSX_max_princ_sz + \
|
|
sizeof(struct svc_cred))
|
|
|
|
int gssp_accept_sec_context_upcall(struct net *net,
|
|
struct gssp_upcall_data *data)
|
|
{
|
|
struct gssx_ctx ctxh = {
|
|
.state = data->in_handle
|
|
};
|
|
struct gssx_arg_accept_sec_context arg = {
|
|
.input_token = data->in_token,
|
|
};
|
|
struct gssx_ctx rctxh = {
|
|
/*
|
|
* pass in the max length we expect for each of these
|
|
* buffers but let the xdr code kmalloc them:
|
|
*/
|
|
.exported_context_token.len = GSSX_max_output_handle_sz,
|
|
.mech.len = GSS_OID_MAX_LEN,
|
|
.src_name.display_name.len = GSSX_max_princ_sz
|
|
};
|
|
struct gssx_res_accept_sec_context res = {
|
|
.context_handle = &rctxh,
|
|
.output_token = &data->out_token
|
|
};
|
|
struct rpc_message msg = {
|
|
.rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT],
|
|
.rpc_argp = &arg,
|
|
.rpc_resp = &res,
|
|
.rpc_cred = NULL, /* FIXME ? */
|
|
};
|
|
struct xdr_netobj client_name = { 0 , NULL };
|
|
int ret;
|
|
|
|
if (data->in_handle.len != 0)
|
|
arg.context_handle = &ctxh;
|
|
res.output_token->len = GSSX_max_output_token_sz;
|
|
|
|
ret = gssp_alloc_receive_pages(&arg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* use nfs/ for targ_name ? */
|
|
|
|
ret = gssp_call(net, &msg);
|
|
|
|
gssp_free_receive_pages(&arg);
|
|
|
|
/* we need to fetch all data even in case of error so
|
|
* that we can free special strctures is they have been allocated */
|
|
data->major_status = res.status.major_status;
|
|
data->minor_status = res.status.minor_status;
|
|
if (res.context_handle) {
|
|
data->out_handle = rctxh.exported_context_token;
|
|
data->mech_oid.len = rctxh.mech.len;
|
|
if (rctxh.mech.data)
|
|
memcpy(data->mech_oid.data, rctxh.mech.data,
|
|
data->mech_oid.len);
|
|
client_name = rctxh.src_name.display_name;
|
|
}
|
|
|
|
if (res.options.count == 1) {
|
|
gssx_buffer *value = &res.options.data[0].value;
|
|
/* Currently we only decode CREDS_VALUE, if we add
|
|
* anything else we'll have to loop and match on the
|
|
* option name */
|
|
if (value->len == 1) {
|
|
/* steal group info from struct svc_cred */
|
|
data->creds = *(struct svc_cred *)value->data;
|
|
data->found_creds = 1;
|
|
}
|
|
/* whether we use it or not, free data */
|
|
kfree(value->data);
|
|
}
|
|
|
|
if (res.options.count != 0) {
|
|
kfree(res.options.data);
|
|
}
|
|
|
|
/* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
|
|
if (data->found_creds && client_name.data != NULL) {
|
|
char *c;
|
|
|
|
data->creds.cr_raw_principal = kstrndup(client_name.data,
|
|
client_name.len, GFP_KERNEL);
|
|
|
|
data->creds.cr_principal = kstrndup(client_name.data,
|
|
client_name.len, GFP_KERNEL);
|
|
if (data->creds.cr_principal) {
|
|
/* terminate and remove realm part */
|
|
c = strchr(data->creds.cr_principal, '@');
|
|
if (c) {
|
|
*c = '\0';
|
|
|
|
/* change service-hostname delimiter */
|
|
c = strchr(data->creds.cr_principal, '/');
|
|
if (c) *c = '@';
|
|
}
|
|
if (!c) {
|
|
/* not a service principal */
|
|
kfree(data->creds.cr_principal);
|
|
data->creds.cr_principal = NULL;
|
|
}
|
|
}
|
|
}
|
|
kfree(client_name.data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void gssp_free_upcall_data(struct gssp_upcall_data *data)
|
|
{
|
|
kfree(data->in_handle.data);
|
|
kfree(data->out_handle.data);
|
|
kfree(data->out_token.data);
|
|
free_svc_cred(&data->creds);
|
|
}
|
|
|
|
/*
|
|
* Initialization stuff
|
|
*/
|
|
|
|
static const struct rpc_version gssp_version1 = {
|
|
.number = GSSPROXY_VERS_1,
|
|
.nrprocs = ARRAY_SIZE(gssp_procedures),
|
|
.procs = gssp_procedures,
|
|
};
|
|
|
|
static const struct rpc_version *gssp_version[] = {
|
|
NULL,
|
|
&gssp_version1,
|
|
};
|
|
|
|
static struct rpc_stat gssp_stats;
|
|
|
|
static const struct rpc_program gssp_program = {
|
|
.name = "gssproxy",
|
|
.number = GSSPROXY_PROGRAM,
|
|
.nrvers = ARRAY_SIZE(gssp_version),
|
|
.version = gssp_version,
|
|
.stats = &gssp_stats,
|
|
};
|