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6a19275ada
Currently we return -ENOMEM for every single failure to create a new auth. This is actually accurate for auth_null and auth_unix, but for auth_gss it's a bit confusing. Allow rpcauth_create (and the ->create methods) to return errors. With this patch, the user may sometimes see an EINVAL instead. Whee. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1157 lines
29 KiB
C
1157 lines
29 KiB
C
/*
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* linux/net/sunrpc/auth_gss.c
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*
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* RPCSEC_GSS client authentication.
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*
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* Copyright (c) 2000 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Dug Song <dugsong@monkey.org>
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* Andy Adamson <andros@umich.edu>
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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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*
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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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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/sched.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/auth_gss.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/gss_err.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/rpc_pipe_fs.h>
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#include <linux/sunrpc/gss_api.h>
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#include <asm/uaccess.h>
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static struct rpc_authops authgss_ops;
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static struct rpc_credops gss_credops;
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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#define NFS_NGROUPS 16
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#define GSS_CRED_EXPIRE (60 * HZ) /* XXX: reasonable? */
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#define GSS_CRED_SLACK 1024 /* XXX: unused */
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/* length of a krb5 verifier (48), plus data added before arguments when
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* using integrity (two 4-byte integers): */
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#define GSS_VERF_SLACK 56
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/* XXX this define must match the gssd define
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* as it is passed to gssd to signal the use of
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* machine creds should be part of the shared rpc interface */
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#define CA_RUN_AS_MACHINE 0x00000200
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/* dump the buffer in `emacs-hexl' style */
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#define isprint(c) ((c > 0x1f) && (c < 0x7f))
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static DEFINE_RWLOCK(gss_ctx_lock);
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struct gss_auth {
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struct rpc_auth rpc_auth;
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struct gss_api_mech *mech;
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enum rpc_gss_svc service;
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struct list_head upcalls;
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struct rpc_clnt *client;
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struct dentry *dentry;
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char path[48];
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spinlock_t lock;
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};
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static void gss_destroy_ctx(struct gss_cl_ctx *);
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static struct rpc_pipe_ops gss_upcall_ops;
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void
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print_hexl(u32 *p, u_int length, u_int offset)
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{
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u_int i, j, jm;
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u8 c, *cp;
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dprintk("RPC: print_hexl: length %d\n",length);
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dprintk("\n");
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cp = (u8 *) p;
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for (i = 0; i < length; i += 0x10) {
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dprintk(" %04x: ", (u_int)(i + offset));
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jm = length - i;
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jm = jm > 16 ? 16 : jm;
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for (j = 0; j < jm; j++) {
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if ((j % 2) == 1)
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dprintk("%02x ", (u_int)cp[i+j]);
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else
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dprintk("%02x", (u_int)cp[i+j]);
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}
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for (; j < 16; j++) {
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if ((j % 2) == 1)
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dprintk(" ");
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else
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dprintk(" ");
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}
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dprintk(" ");
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for (j = 0; j < jm; j++) {
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c = cp[i+j];
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c = isprint(c) ? c : '.';
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dprintk("%c", c);
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}
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dprintk("\n");
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}
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}
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EXPORT_SYMBOL(print_hexl);
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static inline struct gss_cl_ctx *
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gss_get_ctx(struct gss_cl_ctx *ctx)
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{
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atomic_inc(&ctx->count);
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return ctx;
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}
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static inline void
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gss_put_ctx(struct gss_cl_ctx *ctx)
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{
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if (atomic_dec_and_test(&ctx->count))
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gss_destroy_ctx(ctx);
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}
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static void
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gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
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{
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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struct gss_cl_ctx *old;
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write_lock(&gss_ctx_lock);
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old = gss_cred->gc_ctx;
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gss_cred->gc_ctx = ctx;
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cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
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write_unlock(&gss_ctx_lock);
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if (old)
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gss_put_ctx(old);
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}
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static int
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gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
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{
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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int res = 0;
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read_lock(&gss_ctx_lock);
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if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
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res = 1;
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read_unlock(&gss_ctx_lock);
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return res;
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}
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static const void *
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simple_get_bytes(const void *p, const void *end, void *res, size_t len)
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{
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const void *q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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memcpy(res, p, len);
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return q;
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}
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static inline const void *
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simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
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{
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const void *q;
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unsigned int len;
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p = simple_get_bytes(p, end, &len, sizeof(len));
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if (IS_ERR(p))
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return p;
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q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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dest->data = kmalloc(len, GFP_KERNEL);
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if (unlikely(dest->data == NULL))
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return ERR_PTR(-ENOMEM);
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dest->len = len;
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memcpy(dest->data, p, len);
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return q;
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}
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static struct gss_cl_ctx *
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gss_cred_get_ctx(struct rpc_cred *cred)
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{
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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struct gss_cl_ctx *ctx = NULL;
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read_lock(&gss_ctx_lock);
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if (gss_cred->gc_ctx)
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ctx = gss_get_ctx(gss_cred->gc_ctx);
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read_unlock(&gss_ctx_lock);
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return ctx;
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}
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static struct gss_cl_ctx *
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gss_alloc_context(void)
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{
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struct gss_cl_ctx *ctx;
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ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
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if (ctx != NULL) {
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memset(ctx, 0, sizeof(*ctx));
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ctx->gc_proc = RPC_GSS_PROC_DATA;
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ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
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spin_lock_init(&ctx->gc_seq_lock);
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atomic_set(&ctx->count,1);
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}
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return ctx;
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}
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#define GSSD_MIN_TIMEOUT (60 * 60)
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static const void *
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gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
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{
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const void *q;
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unsigned int seclen;
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unsigned int timeout;
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u32 window_size;
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int ret;
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/* First unsigned int gives the lifetime (in seconds) of the cred */
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p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
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if (IS_ERR(p))
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goto err;
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if (timeout == 0)
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timeout = GSSD_MIN_TIMEOUT;
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ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
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/* Sequence number window. Determines the maximum number of simultaneous requests */
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p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
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if (IS_ERR(p))
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goto err;
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ctx->gc_win = window_size;
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/* gssd signals an error by passing ctx->gc_win = 0: */
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if (ctx->gc_win == 0) {
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/* in which case, p points to an error code which we ignore */
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p = ERR_PTR(-EACCES);
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goto err;
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}
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/* copy the opaque wire context */
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p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
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if (IS_ERR(p))
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goto err;
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/* import the opaque security context */
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p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
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if (IS_ERR(p))
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goto err;
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q = (const void *)((const char *)p + seclen);
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if (unlikely(q > end || q < p)) {
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p = ERR_PTR(-EFAULT);
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goto err;
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}
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ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
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if (ret < 0) {
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p = ERR_PTR(ret);
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goto err;
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}
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return q;
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err:
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dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
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return p;
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}
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struct gss_upcall_msg {
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atomic_t count;
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uid_t uid;
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struct rpc_pipe_msg msg;
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struct list_head list;
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struct gss_auth *auth;
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struct rpc_wait_queue rpc_waitqueue;
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wait_queue_head_t waitqueue;
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struct gss_cl_ctx *ctx;
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};
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static void
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gss_release_msg(struct gss_upcall_msg *gss_msg)
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{
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if (!atomic_dec_and_test(&gss_msg->count))
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return;
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BUG_ON(!list_empty(&gss_msg->list));
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if (gss_msg->ctx != NULL)
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gss_put_ctx(gss_msg->ctx);
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kfree(gss_msg);
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}
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static struct gss_upcall_msg *
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__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
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{
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struct gss_upcall_msg *pos;
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list_for_each_entry(pos, &gss_auth->upcalls, list) {
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if (pos->uid != uid)
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continue;
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atomic_inc(&pos->count);
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dprintk("RPC: gss_find_upcall found msg %p\n", pos);
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return pos;
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}
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dprintk("RPC: gss_find_upcall found nothing\n");
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return NULL;
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}
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/* Try to add a upcall to the pipefs queue.
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* If an upcall owned by our uid already exists, then we return a reference
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* to that upcall instead of adding the new upcall.
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*/
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static inline struct gss_upcall_msg *
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gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
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{
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struct gss_upcall_msg *old;
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spin_lock(&gss_auth->lock);
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old = __gss_find_upcall(gss_auth, gss_msg->uid);
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if (old == NULL) {
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atomic_inc(&gss_msg->count);
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list_add(&gss_msg->list, &gss_auth->upcalls);
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} else
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gss_msg = old;
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spin_unlock(&gss_auth->lock);
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return gss_msg;
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}
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static void
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__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
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{
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if (list_empty(&gss_msg->list))
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return;
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list_del_init(&gss_msg->list);
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rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
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wake_up_all(&gss_msg->waitqueue);
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atomic_dec(&gss_msg->count);
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}
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static void
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gss_unhash_msg(struct gss_upcall_msg *gss_msg)
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{
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struct gss_auth *gss_auth = gss_msg->auth;
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spin_lock(&gss_auth->lock);
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__gss_unhash_msg(gss_msg);
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spin_unlock(&gss_auth->lock);
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}
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static void
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gss_upcall_callback(struct rpc_task *task)
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{
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struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
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struct gss_cred, gc_base);
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struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
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BUG_ON(gss_msg == NULL);
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if (gss_msg->ctx)
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gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
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else
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task->tk_status = gss_msg->msg.errno;
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spin_lock(&gss_msg->auth->lock);
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gss_cred->gc_upcall = NULL;
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rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
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spin_unlock(&gss_msg->auth->lock);
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gss_release_msg(gss_msg);
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}
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static inline struct gss_upcall_msg *
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gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
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{
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struct gss_upcall_msg *gss_msg;
|
|
|
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gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL);
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if (gss_msg != NULL) {
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memset(gss_msg, 0, sizeof(*gss_msg));
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INIT_LIST_HEAD(&gss_msg->list);
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rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
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init_waitqueue_head(&gss_msg->waitqueue);
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atomic_set(&gss_msg->count, 1);
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gss_msg->msg.data = &gss_msg->uid;
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gss_msg->msg.len = sizeof(gss_msg->uid);
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gss_msg->uid = uid;
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gss_msg->auth = gss_auth;
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}
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return gss_msg;
|
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}
|
|
|
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static struct gss_upcall_msg *
|
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gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
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{
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struct gss_upcall_msg *gss_new, *gss_msg;
|
|
|
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gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
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if (gss_new == NULL)
|
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return ERR_PTR(-ENOMEM);
|
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gss_msg = gss_add_msg(gss_auth, gss_new);
|
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if (gss_msg == gss_new) {
|
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int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
|
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if (res) {
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gss_unhash_msg(gss_new);
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gss_msg = ERR_PTR(res);
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}
|
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} else
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gss_release_msg(gss_new);
|
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return gss_msg;
|
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}
|
|
|
|
static inline int
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gss_refresh_upcall(struct rpc_task *task)
|
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{
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|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
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struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
|
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struct gss_auth, rpc_auth);
|
|
struct gss_cred *gss_cred = container_of(cred,
|
|
struct gss_cred, gc_base);
|
|
struct gss_upcall_msg *gss_msg;
|
|
int err = 0;
|
|
|
|
dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid);
|
|
gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
|
|
if (IS_ERR(gss_msg)) {
|
|
err = PTR_ERR(gss_msg);
|
|
goto out;
|
|
}
|
|
spin_lock(&gss_auth->lock);
|
|
if (gss_cred->gc_upcall != NULL)
|
|
rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
|
|
else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
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task->tk_timeout = 0;
|
|
gss_cred->gc_upcall = gss_msg;
|
|
/* gss_upcall_callback will release the reference to gss_upcall_msg */
|
|
atomic_inc(&gss_msg->count);
|
|
rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
|
|
} else
|
|
err = gss_msg->msg.errno;
|
|
spin_unlock(&gss_auth->lock);
|
|
gss_release_msg(gss_msg);
|
|
out:
|
|
dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid,
|
|
cred->cr_uid, err);
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
|
|
{
|
|
struct rpc_cred *cred = &gss_cred->gc_base;
|
|
struct gss_upcall_msg *gss_msg;
|
|
DEFINE_WAIT(wait);
|
|
int err = 0;
|
|
|
|
dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
|
|
gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
|
|
if (IS_ERR(gss_msg)) {
|
|
err = PTR_ERR(gss_msg);
|
|
goto out;
|
|
}
|
|
for (;;) {
|
|
prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
|
|
spin_lock(&gss_auth->lock);
|
|
if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
|
|
spin_unlock(&gss_auth->lock);
|
|
break;
|
|
}
|
|
spin_unlock(&gss_auth->lock);
|
|
if (signalled()) {
|
|
err = -ERESTARTSYS;
|
|
goto out_intr;
|
|
}
|
|
schedule();
|
|
}
|
|
if (gss_msg->ctx)
|
|
gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
|
|
else
|
|
err = gss_msg->msg.errno;
|
|
out_intr:
|
|
finish_wait(&gss_msg->waitqueue, &wait);
|
|
gss_release_msg(gss_msg);
|
|
out:
|
|
dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err);
|
|
return err;
|
|
}
|
|
|
|
static ssize_t
|
|
gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
|
|
char __user *dst, size_t buflen)
|
|
{
|
|
char *data = (char *)msg->data + msg->copied;
|
|
ssize_t mlen = msg->len;
|
|
ssize_t left;
|
|
|
|
if (mlen > buflen)
|
|
mlen = buflen;
|
|
left = copy_to_user(dst, data, mlen);
|
|
if (left < 0) {
|
|
msg->errno = left;
|
|
return left;
|
|
}
|
|
mlen -= left;
|
|
msg->copied += mlen;
|
|
msg->errno = 0;
|
|
return mlen;
|
|
}
|
|
|
|
#define MSG_BUF_MAXSIZE 1024
|
|
|
|
static ssize_t
|
|
gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
|
|
{
|
|
const void *p, *end;
|
|
void *buf;
|
|
struct rpc_clnt *clnt;
|
|
struct gss_auth *gss_auth;
|
|
struct rpc_cred *cred;
|
|
struct gss_upcall_msg *gss_msg;
|
|
struct gss_cl_ctx *ctx;
|
|
uid_t uid;
|
|
int err = -EFBIG;
|
|
|
|
if (mlen > MSG_BUF_MAXSIZE)
|
|
goto out;
|
|
err = -ENOMEM;
|
|
buf = kmalloc(mlen, GFP_KERNEL);
|
|
if (!buf)
|
|
goto out;
|
|
|
|
clnt = RPC_I(filp->f_dentry->d_inode)->private;
|
|
err = -EFAULT;
|
|
if (copy_from_user(buf, src, mlen))
|
|
goto err;
|
|
|
|
end = (const void *)((char *)buf + mlen);
|
|
p = simple_get_bytes(buf, end, &uid, sizeof(uid));
|
|
if (IS_ERR(p)) {
|
|
err = PTR_ERR(p);
|
|
goto err;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
ctx = gss_alloc_context();
|
|
if (ctx == NULL)
|
|
goto err;
|
|
err = 0;
|
|
gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth);
|
|
p = gss_fill_context(p, end, ctx, gss_auth->mech);
|
|
if (IS_ERR(p)) {
|
|
err = PTR_ERR(p);
|
|
if (err != -EACCES)
|
|
goto err_put_ctx;
|
|
}
|
|
spin_lock(&gss_auth->lock);
|
|
gss_msg = __gss_find_upcall(gss_auth, uid);
|
|
if (gss_msg) {
|
|
if (err == 0 && gss_msg->ctx == NULL)
|
|
gss_msg->ctx = gss_get_ctx(ctx);
|
|
gss_msg->msg.errno = err;
|
|
__gss_unhash_msg(gss_msg);
|
|
spin_unlock(&gss_auth->lock);
|
|
gss_release_msg(gss_msg);
|
|
} else {
|
|
struct auth_cred acred = { .uid = uid };
|
|
spin_unlock(&gss_auth->lock);
|
|
cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, 0);
|
|
if (IS_ERR(cred)) {
|
|
err = PTR_ERR(cred);
|
|
goto err_put_ctx;
|
|
}
|
|
gss_cred_set_ctx(cred, gss_get_ctx(ctx));
|
|
}
|
|
gss_put_ctx(ctx);
|
|
kfree(buf);
|
|
dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen);
|
|
return mlen;
|
|
err_put_ctx:
|
|
gss_put_ctx(ctx);
|
|
err:
|
|
kfree(buf);
|
|
out:
|
|
dprintk("RPC: gss_pipe_downcall returning %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static void
|
|
gss_pipe_release(struct inode *inode)
|
|
{
|
|
struct rpc_inode *rpci = RPC_I(inode);
|
|
struct rpc_clnt *clnt;
|
|
struct rpc_auth *auth;
|
|
struct gss_auth *gss_auth;
|
|
|
|
clnt = rpci->private;
|
|
auth = clnt->cl_auth;
|
|
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
spin_lock(&gss_auth->lock);
|
|
while (!list_empty(&gss_auth->upcalls)) {
|
|
struct gss_upcall_msg *gss_msg;
|
|
|
|
gss_msg = list_entry(gss_auth->upcalls.next,
|
|
struct gss_upcall_msg, list);
|
|
gss_msg->msg.errno = -EPIPE;
|
|
atomic_inc(&gss_msg->count);
|
|
__gss_unhash_msg(gss_msg);
|
|
spin_unlock(&gss_auth->lock);
|
|
gss_release_msg(gss_msg);
|
|
spin_lock(&gss_auth->lock);
|
|
}
|
|
spin_unlock(&gss_auth->lock);
|
|
}
|
|
|
|
static void
|
|
gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
|
|
{
|
|
struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
|
|
static unsigned long ratelimit;
|
|
|
|
if (msg->errno < 0) {
|
|
dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
|
|
gss_msg);
|
|
atomic_inc(&gss_msg->count);
|
|
gss_unhash_msg(gss_msg);
|
|
if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
|
|
unsigned long now = jiffies;
|
|
if (time_after(now, ratelimit)) {
|
|
printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
|
|
"Please check user daemon is running!\n");
|
|
ratelimit = now + 15*HZ;
|
|
}
|
|
}
|
|
gss_release_msg(gss_msg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* NOTE: we have the opportunity to use different
|
|
* parameters based on the input flavor (which must be a pseudoflavor)
|
|
*/
|
|
static struct rpc_auth *
|
|
gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
|
|
{
|
|
struct gss_auth *gss_auth;
|
|
struct rpc_auth * auth;
|
|
int err = -ENOMEM; /* XXX? */
|
|
|
|
dprintk("RPC: creating GSS authenticator for client %p\n",clnt);
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return ERR_PTR(err);
|
|
if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
|
|
goto out_dec;
|
|
gss_auth->client = clnt;
|
|
err = -EINVAL;
|
|
gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
|
|
if (!gss_auth->mech) {
|
|
printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
|
|
__FUNCTION__, flavor);
|
|
goto err_free;
|
|
}
|
|
gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
|
|
if (gss_auth->service == 0)
|
|
goto err_put_mech;
|
|
INIT_LIST_HEAD(&gss_auth->upcalls);
|
|
spin_lock_init(&gss_auth->lock);
|
|
auth = &gss_auth->rpc_auth;
|
|
auth->au_cslack = GSS_CRED_SLACK >> 2;
|
|
auth->au_rslack = GSS_VERF_SLACK >> 2;
|
|
auth->au_ops = &authgss_ops;
|
|
auth->au_flavor = flavor;
|
|
atomic_set(&auth->au_count, 1);
|
|
|
|
err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE);
|
|
if (err)
|
|
goto err_put_mech;
|
|
|
|
snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s",
|
|
clnt->cl_pathname,
|
|
gss_auth->mech->gm_name);
|
|
gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
|
|
if (IS_ERR(gss_auth->dentry)) {
|
|
err = PTR_ERR(gss_auth->dentry);
|
|
goto err_put_mech;
|
|
}
|
|
|
|
return auth;
|
|
err_put_mech:
|
|
gss_mech_put(gss_auth->mech);
|
|
err_free:
|
|
kfree(gss_auth);
|
|
out_dec:
|
|
module_put(THIS_MODULE);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void
|
|
gss_destroy(struct rpc_auth *auth)
|
|
{
|
|
struct gss_auth *gss_auth;
|
|
|
|
dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
|
|
auth, auth->au_flavor);
|
|
|
|
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
rpc_unlink(gss_auth->path);
|
|
gss_mech_put(gss_auth->mech);
|
|
|
|
rpcauth_free_credcache(auth);
|
|
kfree(gss_auth);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
|
|
* to create a new cred or context, so they check that things have been
|
|
* allocated before freeing them. */
|
|
static void
|
|
gss_destroy_ctx(struct gss_cl_ctx *ctx)
|
|
{
|
|
dprintk("RPC: gss_destroy_ctx\n");
|
|
|
|
if (ctx->gc_gss_ctx)
|
|
gss_delete_sec_context(&ctx->gc_gss_ctx);
|
|
|
|
kfree(ctx->gc_wire_ctx.data);
|
|
kfree(ctx);
|
|
}
|
|
|
|
static void
|
|
gss_destroy_cred(struct rpc_cred *rc)
|
|
{
|
|
struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base);
|
|
|
|
dprintk("RPC: gss_destroy_cred \n");
|
|
|
|
if (cred->gc_ctx)
|
|
gss_put_ctx(cred->gc_ctx);
|
|
kfree(cred);
|
|
}
|
|
|
|
/*
|
|
* Lookup RPCSEC_GSS cred for the current process
|
|
*/
|
|
static struct rpc_cred *
|
|
gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
|
|
{
|
|
return rpcauth_lookup_credcache(auth, acred, taskflags);
|
|
}
|
|
|
|
static struct rpc_cred *
|
|
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int taskflags)
|
|
{
|
|
struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
struct gss_cred *cred = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
|
|
acred->uid, auth->au_flavor);
|
|
|
|
if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL)))
|
|
goto out_err;
|
|
|
|
memset(cred, 0, sizeof(*cred));
|
|
atomic_set(&cred->gc_count, 1);
|
|
cred->gc_uid = acred->uid;
|
|
/*
|
|
* Note: in order to force a call to call_refresh(), we deliberately
|
|
* fail to flag the credential as RPCAUTH_CRED_UPTODATE.
|
|
*/
|
|
cred->gc_flags = 0;
|
|
cred->gc_base.cr_ops = &gss_credops;
|
|
cred->gc_service = gss_auth->service;
|
|
err = gss_create_upcall(gss_auth, cred);
|
|
if (err < 0)
|
|
goto out_err;
|
|
|
|
return &cred->gc_base;
|
|
|
|
out_err:
|
|
dprintk("RPC: gss_create_cred failed with error %d\n", err);
|
|
if (cred) gss_destroy_cred(&cred->gc_base);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int
|
|
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int taskflags)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
|
|
|
|
/* Don't match with creds that have expired. */
|
|
if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
|
|
return 0;
|
|
return (rc->cr_uid == acred->uid);
|
|
}
|
|
|
|
/*
|
|
* Marshal credentials.
|
|
* Maybe we should keep a cached credential for performance reasons.
|
|
*/
|
|
static u32 *
|
|
gss_marshal(struct rpc_task *task, u32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
u32 *cred_len;
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
u32 maj_stat = 0;
|
|
struct xdr_netobj mic;
|
|
struct kvec iov;
|
|
struct xdr_buf verf_buf;
|
|
|
|
dprintk("RPC: %4u gss_marshal\n", task->tk_pid);
|
|
|
|
*p++ = htonl(RPC_AUTH_GSS);
|
|
cred_len = p++;
|
|
|
|
spin_lock(&ctx->gc_seq_lock);
|
|
req->rq_seqno = ctx->gc_seq++;
|
|
spin_unlock(&ctx->gc_seq_lock);
|
|
|
|
*p++ = htonl((u32) RPC_GSS_VERSION);
|
|
*p++ = htonl((u32) ctx->gc_proc);
|
|
*p++ = htonl((u32) req->rq_seqno);
|
|
*p++ = htonl((u32) gss_cred->gc_service);
|
|
p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
|
|
*cred_len = htonl((p - (cred_len + 1)) << 2);
|
|
|
|
/* We compute the checksum for the verifier over the xdr-encoded bytes
|
|
* starting with the xid and ending at the end of the credential: */
|
|
iov.iov_base = req->rq_snd_buf.head[0].iov_base;
|
|
if (task->tk_client->cl_xprt->stream)
|
|
/* See clnt.c:call_header() */
|
|
iov.iov_base += 4;
|
|
iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
|
|
xdr_buf_from_iov(&iov, &verf_buf);
|
|
|
|
/* set verifier flavor*/
|
|
*p++ = htonl(RPC_AUTH_GSS);
|
|
|
|
mic.data = (u8 *)(p + 1);
|
|
maj_stat = gss_get_mic(ctx->gc_gss_ctx,
|
|
GSS_C_QOP_DEFAULT,
|
|
&verf_buf, &mic);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
|
|
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
} else if (maj_stat != 0) {
|
|
printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
|
|
goto out_put_ctx;
|
|
}
|
|
p = xdr_encode_opaque(p, NULL, mic.len);
|
|
gss_put_ctx(ctx);
|
|
return p;
|
|
out_put_ctx:
|
|
gss_put_ctx(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Refresh credentials. XXX - finish
|
|
*/
|
|
static int
|
|
gss_refresh(struct rpc_task *task)
|
|
{
|
|
|
|
if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
|
|
return gss_refresh_upcall(task);
|
|
return 0;
|
|
}
|
|
|
|
static u32 *
|
|
gss_validate(struct rpc_task *task, u32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
u32 seq, qop_state;
|
|
struct kvec iov;
|
|
struct xdr_buf verf_buf;
|
|
struct xdr_netobj mic;
|
|
u32 flav,len;
|
|
u32 maj_stat;
|
|
|
|
dprintk("RPC: %4u gss_validate\n", task->tk_pid);
|
|
|
|
flav = ntohl(*p++);
|
|
if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
|
|
goto out_bad;
|
|
if (flav != RPC_AUTH_GSS)
|
|
goto out_bad;
|
|
seq = htonl(task->tk_rqstp->rq_seqno);
|
|
iov.iov_base = &seq;
|
|
iov.iov_len = sizeof(seq);
|
|
xdr_buf_from_iov(&iov, &verf_buf);
|
|
mic.data = (u8 *)p;
|
|
mic.len = len;
|
|
|
|
maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic, &qop_state);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
if (maj_stat)
|
|
goto out_bad;
|
|
switch (gss_cred->gc_service) {
|
|
case RPC_GSS_SVC_NONE:
|
|
/* verifier data, flavor, length: */
|
|
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 2;
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
/* verifier data, flavor, length, length, sequence number: */
|
|
task->tk_auth->au_rslack = XDR_QUADLEN(len) + 4;
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
goto out_bad;
|
|
}
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
|
|
task->tk_pid);
|
|
return p + XDR_QUADLEN(len);
|
|
out_bad:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid);
|
|
return NULL;
|
|
}
|
|
|
|
static inline int
|
|
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj)
|
|
{
|
|
struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
|
|
struct xdr_buf integ_buf;
|
|
u32 *integ_len = NULL;
|
|
struct xdr_netobj mic;
|
|
u32 offset, *q;
|
|
struct kvec *iov;
|
|
u32 maj_stat = 0;
|
|
int status = -EIO;
|
|
|
|
integ_len = p++;
|
|
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
|
|
*p++ = htonl(rqstp->rq_seqno);
|
|
|
|
status = encode(rqstp, p, obj);
|
|
if (status)
|
|
return status;
|
|
|
|
if (xdr_buf_subsegment(snd_buf, &integ_buf,
|
|
offset, snd_buf->len - offset))
|
|
return status;
|
|
*integ_len = htonl(integ_buf.len);
|
|
|
|
/* guess whether we're in the head or the tail: */
|
|
if (snd_buf->page_len || snd_buf->tail[0].iov_len)
|
|
iov = snd_buf->tail;
|
|
else
|
|
iov = snd_buf->head;
|
|
p = iov->iov_base + iov->iov_len;
|
|
mic.data = (u8 *)(p + 1);
|
|
|
|
maj_stat = gss_get_mic(ctx->gc_gss_ctx,
|
|
GSS_C_QOP_DEFAULT, &integ_buf, &mic);
|
|
status = -EIO; /* XXX? */
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
else if (maj_stat)
|
|
return status;
|
|
q = xdr_encode_opaque(p, NULL, mic.len);
|
|
|
|
offset = (u8 *)q - (u8 *)p;
|
|
iov->iov_len += offset;
|
|
snd_buf->len += offset;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gss_wrap_req(struct rpc_task *task,
|
|
kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
int status = -EIO;
|
|
|
|
dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid);
|
|
if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
|
|
/* The spec seems a little ambiguous here, but I think that not
|
|
* wrapping context destruction requests makes the most sense.
|
|
*/
|
|
status = encode(rqstp, p, obj);
|
|
goto out;
|
|
}
|
|
switch (gss_cred->gc_service) {
|
|
case RPC_GSS_SVC_NONE:
|
|
status = encode(rqstp, p, obj);
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
status = gss_wrap_req_integ(cred, ctx, encode,
|
|
rqstp, p, obj);
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
break;
|
|
}
|
|
out:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status);
|
|
return status;
|
|
}
|
|
|
|
static inline int
|
|
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
struct rpc_rqst *rqstp, u32 **p)
|
|
{
|
|
struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
|
|
struct xdr_buf integ_buf;
|
|
struct xdr_netobj mic;
|
|
u32 data_offset, mic_offset;
|
|
u32 integ_len;
|
|
u32 maj_stat;
|
|
int status = -EIO;
|
|
|
|
integ_len = ntohl(*(*p)++);
|
|
if (integ_len & 3)
|
|
return status;
|
|
data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
|
|
mic_offset = integ_len + data_offset;
|
|
if (mic_offset > rcv_buf->len)
|
|
return status;
|
|
if (ntohl(*(*p)++) != rqstp->rq_seqno)
|
|
return status;
|
|
|
|
if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
|
|
mic_offset - data_offset))
|
|
return status;
|
|
|
|
if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
|
|
return status;
|
|
|
|
maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf,
|
|
&mic, NULL);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
return status;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gss_unwrap_resp(struct rpc_task *task,
|
|
kxdrproc_t decode, void *rqstp, u32 *p, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
int status = -EIO;
|
|
|
|
if (ctx->gc_proc != RPC_GSS_PROC_DATA)
|
|
goto out_decode;
|
|
switch (gss_cred->gc_service) {
|
|
case RPC_GSS_SVC_NONE:
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
|
|
if (status)
|
|
goto out;
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
break;
|
|
}
|
|
out_decode:
|
|
status = decode(rqstp, p, obj);
|
|
out:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid,
|
|
status);
|
|
return status;
|
|
}
|
|
|
|
static struct rpc_authops authgss_ops = {
|
|
.owner = THIS_MODULE,
|
|
.au_flavor = RPC_AUTH_GSS,
|
|
#ifdef RPC_DEBUG
|
|
.au_name = "RPCSEC_GSS",
|
|
#endif
|
|
.create = gss_create,
|
|
.destroy = gss_destroy,
|
|
.lookup_cred = gss_lookup_cred,
|
|
.crcreate = gss_create_cred
|
|
};
|
|
|
|
static struct rpc_credops gss_credops = {
|
|
.cr_name = "AUTH_GSS",
|
|
.crdestroy = gss_destroy_cred,
|
|
.crmatch = gss_match,
|
|
.crmarshal = gss_marshal,
|
|
.crrefresh = gss_refresh,
|
|
.crvalidate = gss_validate,
|
|
.crwrap_req = gss_wrap_req,
|
|
.crunwrap_resp = gss_unwrap_resp,
|
|
};
|
|
|
|
static struct rpc_pipe_ops gss_upcall_ops = {
|
|
.upcall = gss_pipe_upcall,
|
|
.downcall = gss_pipe_downcall,
|
|
.destroy_msg = gss_pipe_destroy_msg,
|
|
.release_pipe = gss_pipe_release,
|
|
};
|
|
|
|
/*
|
|
* Initialize RPCSEC_GSS module
|
|
*/
|
|
static int __init init_rpcsec_gss(void)
|
|
{
|
|
int err = 0;
|
|
|
|
err = rpcauth_register(&authgss_ops);
|
|
if (err)
|
|
goto out;
|
|
err = gss_svc_init();
|
|
if (err)
|
|
goto out_unregister;
|
|
return 0;
|
|
out_unregister:
|
|
rpcauth_unregister(&authgss_ops);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_rpcsec_gss(void)
|
|
{
|
|
gss_svc_shutdown();
|
|
rpcauth_unregister(&authgss_ops);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(init_rpcsec_gss)
|
|
module_exit(exit_rpcsec_gss)
|