1724 lines
44 KiB
C
1724 lines
44 KiB
C
/*
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* linux/net/sunrpc/auth_gss/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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#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/sched.h>
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#include <linux/pagemap.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 const struct rpc_authops authgss_ops;
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static const struct rpc_credops gss_credops;
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static const struct rpc_credops gss_nullops;
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#define GSS_RETRY_EXPIRED 5
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static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
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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 GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
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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 100
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struct gss_auth {
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struct kref kref;
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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 rpc_clnt *client;
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/*
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* There are two upcall pipes; dentry[1], named "gssd", is used
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* for the new text-based upcall; dentry[0] is named after the
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* mechanism (for example, "krb5") and exists for
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* backwards-compatibility with older gssd's.
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*/
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struct rpc_pipe *pipe[2];
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};
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/* pipe_version >= 0 if and only if someone has a pipe open. */
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static int pipe_version = -1;
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static atomic_t pipe_users = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(pipe_version_lock);
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static struct rpc_wait_queue pipe_version_rpc_waitqueue;
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static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
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static void gss_free_ctx(struct gss_cl_ctx *);
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static const struct rpc_pipe_ops gss_upcall_ops_v0;
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static const struct rpc_pipe_ops gss_upcall_ops_v1;
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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_free_ctx(ctx);
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}
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/* gss_cred_set_ctx:
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* called by gss_upcall_callback and gss_create_upcall in order
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* to set the gss context. The actual exchange of an old context
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* and a new one is protected by the pipe->lock.
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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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if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
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return;
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gss_get_ctx(ctx);
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rcu_assign_pointer(gss_cred->gc_ctx, ctx);
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set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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smp_mb__before_clear_bit();
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clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
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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 = kmemdup(p, len, GFP_NOFS);
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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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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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rcu_read_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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rcu_read_unlock();
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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 = kzalloc(sizeof(*ctx), GFP_NOFS);
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if (ctx != NULL) {
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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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/*
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* in which case, p points to an error code. Anything other
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* than -EKEYEXPIRED gets converted to -EACCES.
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*/
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p = simple_get_bytes(p, end, &ret, sizeof(ret));
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if (!IS_ERR(p))
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p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
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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, GFP_NOFS);
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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: %s returning %ld\n", __func__, -PTR_ERR(p));
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return p;
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}
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#define UPCALL_BUF_LEN 128
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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_pipe *pipe;
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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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char databuf[UPCALL_BUF_LEN];
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};
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static int get_pipe_version(void)
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{
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int ret;
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spin_lock(&pipe_version_lock);
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if (pipe_version >= 0) {
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atomic_inc(&pipe_users);
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ret = pipe_version;
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} else
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ret = -EAGAIN;
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spin_unlock(&pipe_version_lock);
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return ret;
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}
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static void put_pipe_version(void)
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{
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if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
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pipe_version = -1;
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spin_unlock(&pipe_version_lock);
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}
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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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put_pipe_version();
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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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rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
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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 rpc_pipe *pipe, 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, &pipe->in_downcall, 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: %s found msg %p\n", __func__, pos);
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return pos;
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}
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dprintk("RPC: %s found nothing\n", __func__);
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return NULL;
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}
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/* Try to add an 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_upcall_msg *gss_msg)
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{
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struct rpc_pipe *pipe = gss_msg->pipe;
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struct gss_upcall_msg *old;
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spin_lock(&pipe->lock);
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old = __gss_find_upcall(pipe, 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, &pipe->in_downcall);
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} else
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gss_msg = old;
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spin_unlock(&pipe->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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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 rpc_pipe *pipe = gss_msg->pipe;
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if (list_empty(&gss_msg->list))
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return;
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spin_lock(&pipe->lock);
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if (!list_empty(&gss_msg->list))
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__gss_unhash_msg(gss_msg);
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spin_unlock(&pipe->lock);
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}
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|
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static void
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gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
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{
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switch (gss_msg->msg.errno) {
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case 0:
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if (gss_msg->ctx == NULL)
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break;
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clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
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gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
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break;
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case -EKEYEXPIRED:
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set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
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}
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gss_cred->gc_upcall_timestamp = jiffies;
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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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}
|
|
|
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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_rqstp->rq_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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struct rpc_pipe *pipe = gss_msg->pipe;
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|
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spin_lock(&pipe->lock);
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gss_handle_downcall_result(gss_cred, gss_msg);
|
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spin_unlock(&pipe->lock);
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task->tk_status = gss_msg->msg.errno;
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gss_release_msg(gss_msg);
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}
|
|
|
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static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
|
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{
|
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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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}
|
|
|
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static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
|
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struct rpc_clnt *clnt,
|
|
const char *service_name)
|
|
{
|
|
struct gss_api_mech *mech = gss_msg->auth->mech;
|
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char *p = gss_msg->databuf;
|
|
int len = 0;
|
|
|
|
gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ",
|
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mech->gm_name,
|
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gss_msg->uid);
|
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p += gss_msg->msg.len;
|
|
if (clnt->cl_principal) {
|
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len = sprintf(p, "target=%s ", clnt->cl_principal);
|
|
p += len;
|
|
gss_msg->msg.len += len;
|
|
}
|
|
if (service_name != NULL) {
|
|
len = sprintf(p, "service=%s ", service_name);
|
|
p += len;
|
|
gss_msg->msg.len += len;
|
|
}
|
|
if (mech->gm_upcall_enctypes) {
|
|
len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes);
|
|
p += len;
|
|
gss_msg->msg.len += len;
|
|
}
|
|
len = sprintf(p, "\n");
|
|
gss_msg->msg.len += len;
|
|
|
|
gss_msg->msg.data = gss_msg->databuf;
|
|
BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
|
|
}
|
|
|
|
static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
|
|
struct rpc_clnt *clnt,
|
|
const char *service_name)
|
|
{
|
|
if (pipe_version == 0)
|
|
gss_encode_v0_msg(gss_msg);
|
|
else /* pipe_version == 1 */
|
|
gss_encode_v1_msg(gss_msg, clnt, service_name);
|
|
}
|
|
|
|
static struct gss_upcall_msg *
|
|
gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt,
|
|
uid_t uid, const char *service_name)
|
|
{
|
|
struct gss_upcall_msg *gss_msg;
|
|
int vers;
|
|
|
|
gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
|
|
if (gss_msg == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
vers = get_pipe_version();
|
|
if (vers < 0) {
|
|
kfree(gss_msg);
|
|
return ERR_PTR(vers);
|
|
}
|
|
gss_msg->pipe = gss_auth->pipe[vers];
|
|
INIT_LIST_HEAD(&gss_msg->list);
|
|
rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
|
|
init_waitqueue_head(&gss_msg->waitqueue);
|
|
atomic_set(&gss_msg->count, 1);
|
|
gss_msg->uid = uid;
|
|
gss_msg->auth = gss_auth;
|
|
gss_encode_msg(gss_msg, clnt, service_name);
|
|
return gss_msg;
|
|
}
|
|
|
|
static struct gss_upcall_msg *
|
|
gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(cred,
|
|
struct gss_cred, gc_base);
|
|
struct gss_upcall_msg *gss_new, *gss_msg;
|
|
uid_t uid = cred->cr_uid;
|
|
|
|
gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal);
|
|
if (IS_ERR(gss_new))
|
|
return gss_new;
|
|
gss_msg = gss_add_msg(gss_new);
|
|
if (gss_msg == gss_new) {
|
|
int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
|
|
if (res) {
|
|
gss_unhash_msg(gss_new);
|
|
gss_msg = ERR_PTR(res);
|
|
}
|
|
} else
|
|
gss_release_msg(gss_new);
|
|
return gss_msg;
|
|
}
|
|
|
|
static void warn_gssd(void)
|
|
{
|
|
static unsigned long ratelimit;
|
|
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;
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
gss_refresh_upcall(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
struct gss_auth *gss_auth = container_of(cred->cr_auth,
|
|
struct gss_auth, rpc_auth);
|
|
struct gss_cred *gss_cred = container_of(cred,
|
|
struct gss_cred, gc_base);
|
|
struct gss_upcall_msg *gss_msg;
|
|
struct rpc_pipe *pipe;
|
|
int err = 0;
|
|
|
|
dprintk("RPC: %5u %s for uid %u\n",
|
|
task->tk_pid, __func__, cred->cr_uid);
|
|
gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
|
|
if (PTR_ERR(gss_msg) == -EAGAIN) {
|
|
/* XXX: warning on the first, under the assumption we
|
|
* shouldn't normally hit this case on a refresh. */
|
|
warn_gssd();
|
|
task->tk_timeout = 15*HZ;
|
|
rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
|
|
return -EAGAIN;
|
|
}
|
|
if (IS_ERR(gss_msg)) {
|
|
err = PTR_ERR(gss_msg);
|
|
goto out;
|
|
}
|
|
pipe = gss_msg->pipe;
|
|
spin_lock(&pipe->lock);
|
|
if (gss_cred->gc_upcall != NULL)
|
|
rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
|
|
else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
|
|
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);
|
|
} else {
|
|
gss_handle_downcall_result(gss_cred, gss_msg);
|
|
err = gss_msg->msg.errno;
|
|
}
|
|
spin_unlock(&pipe->lock);
|
|
gss_release_msg(gss_msg);
|
|
out:
|
|
dprintk("RPC: %5u %s for uid %u result %d\n",
|
|
task->tk_pid, __func__, cred->cr_uid, err);
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
|
|
{
|
|
struct rpc_pipe *pipe;
|
|
struct rpc_cred *cred = &gss_cred->gc_base;
|
|
struct gss_upcall_msg *gss_msg;
|
|
DEFINE_WAIT(wait);
|
|
int err = 0;
|
|
|
|
dprintk("RPC: %s for uid %u\n", __func__, cred->cr_uid);
|
|
retry:
|
|
gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
|
|
if (PTR_ERR(gss_msg) == -EAGAIN) {
|
|
err = wait_event_interruptible_timeout(pipe_version_waitqueue,
|
|
pipe_version >= 0, 15*HZ);
|
|
if (pipe_version < 0) {
|
|
warn_gssd();
|
|
err = -EACCES;
|
|
}
|
|
if (err)
|
|
goto out;
|
|
goto retry;
|
|
}
|
|
if (IS_ERR(gss_msg)) {
|
|
err = PTR_ERR(gss_msg);
|
|
goto out;
|
|
}
|
|
pipe = gss_msg->pipe;
|
|
for (;;) {
|
|
prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
|
|
spin_lock(&pipe->lock);
|
|
if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
|
|
break;
|
|
}
|
|
spin_unlock(&pipe->lock);
|
|
if (fatal_signal_pending(current)) {
|
|
err = -ERESTARTSYS;
|
|
goto out_intr;
|
|
}
|
|
schedule();
|
|
}
|
|
if (gss_msg->ctx)
|
|
gss_cred_set_ctx(cred, gss_msg->ctx);
|
|
else
|
|
err = gss_msg->msg.errno;
|
|
spin_unlock(&pipe->lock);
|
|
out_intr:
|
|
finish_wait(&gss_msg->waitqueue, &wait);
|
|
gss_release_msg(gss_msg);
|
|
out:
|
|
dprintk("RPC: %s for uid %u result %d\n",
|
|
__func__, cred->cr_uid, err);
|
|
return err;
|
|
}
|
|
|
|
#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 gss_upcall_msg *gss_msg;
|
|
struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe;
|
|
struct gss_cl_ctx *ctx;
|
|
uid_t uid;
|
|
ssize_t err = -EFBIG;
|
|
|
|
if (mlen > MSG_BUF_MAXSIZE)
|
|
goto out;
|
|
err = -ENOMEM;
|
|
buf = kmalloc(mlen, GFP_NOFS);
|
|
if (!buf)
|
|
goto out;
|
|
|
|
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 = -ENOENT;
|
|
/* Find a matching upcall */
|
|
spin_lock(&pipe->lock);
|
|
gss_msg = __gss_find_upcall(pipe, uid);
|
|
if (gss_msg == NULL) {
|
|
spin_unlock(&pipe->lock);
|
|
goto err_put_ctx;
|
|
}
|
|
list_del_init(&gss_msg->list);
|
|
spin_unlock(&pipe->lock);
|
|
|
|
p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
|
|
if (IS_ERR(p)) {
|
|
err = PTR_ERR(p);
|
|
switch (err) {
|
|
case -EACCES:
|
|
case -EKEYEXPIRED:
|
|
gss_msg->msg.errno = err;
|
|
err = mlen;
|
|
break;
|
|
case -EFAULT:
|
|
case -ENOMEM:
|
|
case -EINVAL:
|
|
case -ENOSYS:
|
|
gss_msg->msg.errno = -EAGAIN;
|
|
break;
|
|
default:
|
|
printk(KERN_CRIT "%s: bad return from "
|
|
"gss_fill_context: %zd\n", __func__, err);
|
|
BUG();
|
|
}
|
|
goto err_release_msg;
|
|
}
|
|
gss_msg->ctx = gss_get_ctx(ctx);
|
|
err = mlen;
|
|
|
|
err_release_msg:
|
|
spin_lock(&pipe->lock);
|
|
__gss_unhash_msg(gss_msg);
|
|
spin_unlock(&pipe->lock);
|
|
gss_release_msg(gss_msg);
|
|
err_put_ctx:
|
|
gss_put_ctx(ctx);
|
|
err:
|
|
kfree(buf);
|
|
out:
|
|
dprintk("RPC: %s returning %Zd\n", __func__, err);
|
|
return err;
|
|
}
|
|
|
|
static int gss_pipe_open(struct inode *inode, int new_version)
|
|
{
|
|
int ret = 0;
|
|
|
|
spin_lock(&pipe_version_lock);
|
|
if (pipe_version < 0) {
|
|
/* First open of any gss pipe determines the version: */
|
|
pipe_version = new_version;
|
|
rpc_wake_up(&pipe_version_rpc_waitqueue);
|
|
wake_up(&pipe_version_waitqueue);
|
|
} else if (pipe_version != new_version) {
|
|
/* Trying to open a pipe of a different version */
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
atomic_inc(&pipe_users);
|
|
out:
|
|
spin_unlock(&pipe_version_lock);
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int gss_pipe_open_v0(struct inode *inode)
|
|
{
|
|
return gss_pipe_open(inode, 0);
|
|
}
|
|
|
|
static int gss_pipe_open_v1(struct inode *inode)
|
|
{
|
|
return gss_pipe_open(inode, 1);
|
|
}
|
|
|
|
static void
|
|
gss_pipe_release(struct inode *inode)
|
|
{
|
|
struct rpc_pipe *pipe = RPC_I(inode)->pipe;
|
|
struct gss_upcall_msg *gss_msg;
|
|
|
|
restart:
|
|
spin_lock(&pipe->lock);
|
|
list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
|
|
|
|
if (!list_empty(&gss_msg->msg.list))
|
|
continue;
|
|
gss_msg->msg.errno = -EPIPE;
|
|
atomic_inc(&gss_msg->count);
|
|
__gss_unhash_msg(gss_msg);
|
|
spin_unlock(&pipe->lock);
|
|
gss_release_msg(gss_msg);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&pipe->lock);
|
|
|
|
put_pipe_version();
|
|
}
|
|
|
|
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);
|
|
|
|
if (msg->errno < 0) {
|
|
dprintk("RPC: %s releasing msg %p\n",
|
|
__func__, gss_msg);
|
|
atomic_inc(&gss_msg->count);
|
|
gss_unhash_msg(gss_msg);
|
|
if (msg->errno == -ETIMEDOUT)
|
|
warn_gssd();
|
|
gss_release_msg(gss_msg);
|
|
}
|
|
}
|
|
|
|
static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
|
|
{
|
|
struct gss_auth *gss_auth;
|
|
|
|
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
if (gss_auth->pipe[0]->dentry)
|
|
rpc_unlink(gss_auth->pipe[0]->dentry);
|
|
if (gss_auth->pipe[1]->dentry)
|
|
rpc_unlink(gss_auth->pipe[1]->dentry);
|
|
}
|
|
|
|
static int gss_pipes_dentries_create(struct rpc_auth *auth)
|
|
{
|
|
int err;
|
|
struct gss_auth *gss_auth;
|
|
struct rpc_clnt *clnt;
|
|
|
|
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
clnt = gss_auth->client;
|
|
|
|
gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
|
|
"gssd",
|
|
clnt, gss_auth->pipe[1]);
|
|
if (IS_ERR(gss_auth->pipe[1]->dentry))
|
|
return PTR_ERR(gss_auth->pipe[1]->dentry);
|
|
gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
|
|
gss_auth->mech->gm_name,
|
|
clnt, gss_auth->pipe[0]);
|
|
if (IS_ERR(gss_auth->pipe[0]->dentry)) {
|
|
err = PTR_ERR(gss_auth->pipe[0]->dentry);
|
|
goto err_unlink_pipe_1;
|
|
}
|
|
return 0;
|
|
|
|
err_unlink_pipe_1:
|
|
rpc_unlink(gss_auth->pipe[1]->dentry);
|
|
return err;
|
|
}
|
|
|
|
static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
|
|
struct rpc_auth *auth)
|
|
{
|
|
struct net *net = rpc_net_ns(clnt);
|
|
struct super_block *sb;
|
|
|
|
sb = rpc_get_sb_net(net);
|
|
if (sb) {
|
|
if (clnt->cl_dentry)
|
|
gss_pipes_dentries_destroy(auth);
|
|
rpc_put_sb_net(net);
|
|
}
|
|
}
|
|
|
|
static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
|
|
struct rpc_auth *auth)
|
|
{
|
|
struct net *net = rpc_net_ns(clnt);
|
|
struct super_block *sb;
|
|
int err = 0;
|
|
|
|
sb = rpc_get_sb_net(net);
|
|
if (sb) {
|
|
if (clnt->cl_dentry)
|
|
err = gss_pipes_dentries_create(auth);
|
|
rpc_put_sb_net(net);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* 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!\n",
|
|
__func__, flavor);
|
|
goto err_free;
|
|
}
|
|
gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
|
|
if (gss_auth->service == 0)
|
|
goto err_put_mech;
|
|
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);
|
|
kref_init(&gss_auth->kref);
|
|
|
|
/*
|
|
* Note: if we created the old pipe first, then someone who
|
|
* examined the directory at the right moment might conclude
|
|
* that we supported only the old pipe. So we instead create
|
|
* the new pipe first.
|
|
*/
|
|
gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1,
|
|
RPC_PIPE_WAIT_FOR_OPEN);
|
|
if (IS_ERR(gss_auth->pipe[1])) {
|
|
err = PTR_ERR(gss_auth->pipe[1]);
|
|
goto err_put_mech;
|
|
}
|
|
|
|
gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0,
|
|
RPC_PIPE_WAIT_FOR_OPEN);
|
|
if (IS_ERR(gss_auth->pipe[0])) {
|
|
err = PTR_ERR(gss_auth->pipe[0]);
|
|
goto err_destroy_pipe_1;
|
|
}
|
|
err = gss_pipes_dentries_create_net(clnt, auth);
|
|
if (err)
|
|
goto err_destroy_pipe_0;
|
|
err = rpcauth_init_credcache(auth);
|
|
if (err)
|
|
goto err_unlink_pipes;
|
|
|
|
return auth;
|
|
err_unlink_pipes:
|
|
gss_pipes_dentries_destroy_net(clnt, auth);
|
|
err_destroy_pipe_0:
|
|
rpc_destroy_pipe_data(gss_auth->pipe[0]);
|
|
err_destroy_pipe_1:
|
|
rpc_destroy_pipe_data(gss_auth->pipe[1]);
|
|
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_free(struct gss_auth *gss_auth)
|
|
{
|
|
gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth);
|
|
rpc_destroy_pipe_data(gss_auth->pipe[0]);
|
|
rpc_destroy_pipe_data(gss_auth->pipe[1]);
|
|
gss_mech_put(gss_auth->mech);
|
|
|
|
kfree(gss_auth);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static void
|
|
gss_free_callback(struct kref *kref)
|
|
{
|
|
struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
|
|
|
|
gss_free(gss_auth);
|
|
}
|
|
|
|
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);
|
|
|
|
rpcauth_destroy_credcache(auth);
|
|
|
|
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
kref_put(&gss_auth->kref, gss_free_callback);
|
|
}
|
|
|
|
/*
|
|
* gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
|
|
* to the server with the GSS control procedure field set to
|
|
* RPC_GSS_PROC_DESTROY. This should normally cause the server to release
|
|
* all RPCSEC_GSS state associated with that context.
|
|
*/
|
|
static int
|
|
gss_destroying_context(struct rpc_cred *cred)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
|
|
struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
|
|
struct rpc_task *task;
|
|
|
|
if (gss_cred->gc_ctx == NULL ||
|
|
test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
|
|
return 0;
|
|
|
|
gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
|
|
cred->cr_ops = &gss_nullops;
|
|
|
|
/* Take a reference to ensure the cred will be destroyed either
|
|
* by the RPC call or by the put_rpccred() below */
|
|
get_rpccred(cred);
|
|
|
|
task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
|
|
if (!IS_ERR(task))
|
|
rpc_put_task(task);
|
|
|
|
put_rpccred(cred);
|
|
return 1;
|
|
}
|
|
|
|
/* gss_destroy_cred (and gss_free_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_do_free_ctx(struct gss_cl_ctx *ctx)
|
|
{
|
|
dprintk("RPC: %s\n", __func__);
|
|
|
|
gss_delete_sec_context(&ctx->gc_gss_ctx);
|
|
kfree(ctx->gc_wire_ctx.data);
|
|
kfree(ctx);
|
|
}
|
|
|
|
static void
|
|
gss_free_ctx_callback(struct rcu_head *head)
|
|
{
|
|
struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
|
|
gss_do_free_ctx(ctx);
|
|
}
|
|
|
|
static void
|
|
gss_free_ctx(struct gss_cl_ctx *ctx)
|
|
{
|
|
call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
|
|
}
|
|
|
|
static void
|
|
gss_free_cred(struct gss_cred *gss_cred)
|
|
{
|
|
dprintk("RPC: %s cred=%p\n", __func__, gss_cred);
|
|
kfree(gss_cred);
|
|
}
|
|
|
|
static void
|
|
gss_free_cred_callback(struct rcu_head *head)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
|
|
gss_free_cred(gss_cred);
|
|
}
|
|
|
|
static void
|
|
gss_destroy_nullcred(struct rpc_cred *cred)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
|
|
struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
|
|
struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
|
|
|
|
RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
|
|
call_rcu(&cred->cr_rcu, gss_free_cred_callback);
|
|
if (ctx)
|
|
gss_put_ctx(ctx);
|
|
kref_put(&gss_auth->kref, gss_free_callback);
|
|
}
|
|
|
|
static void
|
|
gss_destroy_cred(struct rpc_cred *cred)
|
|
{
|
|
|
|
if (gss_destroying_context(cred))
|
|
return;
|
|
gss_destroy_nullcred(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 flags)
|
|
{
|
|
return rpcauth_lookup_credcache(auth, acred, flags);
|
|
}
|
|
|
|
static struct rpc_cred *
|
|
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
|
|
{
|
|
struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
struct gss_cred *cred = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
dprintk("RPC: %s for uid %d, flavor %d\n",
|
|
__func__, acred->uid, auth->au_flavor);
|
|
|
|
if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
|
|
goto out_err;
|
|
|
|
rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
|
|
/*
|
|
* Note: in order to force a call to call_refresh(), we deliberately
|
|
* fail to flag the credential as RPCAUTH_CRED_UPTODATE.
|
|
*/
|
|
cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
|
|
cred->gc_service = gss_auth->service;
|
|
cred->gc_principal = NULL;
|
|
if (acred->machine_cred)
|
|
cred->gc_principal = acred->principal;
|
|
kref_get(&gss_auth->kref);
|
|
return &cred->gc_base;
|
|
|
|
out_err:
|
|
dprintk("RPC: %s failed with error %d\n", __func__, err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int
|
|
gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
|
|
{
|
|
struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
|
|
struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
|
|
int err;
|
|
|
|
do {
|
|
err = gss_create_upcall(gss_auth, gss_cred);
|
|
} while (err == -EAGAIN);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
|
|
{
|
|
struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
|
|
|
|
if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
|
|
goto out;
|
|
/* Don't match with creds that have expired. */
|
|
if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
|
|
return 0;
|
|
if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
|
|
return 0;
|
|
out:
|
|
if (acred->principal != NULL) {
|
|
if (gss_cred->gc_principal == NULL)
|
|
return 0;
|
|
return strcmp(acred->principal, gss_cred->gc_principal) == 0;
|
|
}
|
|
if (gss_cred->gc_principal != NULL)
|
|
return 0;
|
|
return rc->cr_uid == acred->uid;
|
|
}
|
|
|
|
/*
|
|
* Marshal credentials.
|
|
* Maybe we should keep a cached credential for performance reasons.
|
|
*/
|
|
static __be32 *
|
|
gss_marshal(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_cred *cred = req->rq_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
__be32 *cred_len;
|
|
u32 maj_stat = 0;
|
|
struct xdr_netobj mic;
|
|
struct kvec iov;
|
|
struct xdr_buf verf_buf;
|
|
|
|
dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
|
|
|
|
*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 = xprt_skip_transport_header(task->tk_xprt,
|
|
req->rq_snd_buf.head[0].iov_base);
|
|
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, &verf_buf, &mic);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
} 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;
|
|
}
|
|
|
|
static int gss_renew_cred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
|
|
struct gss_cred *gss_cred = container_of(oldcred,
|
|
struct gss_cred,
|
|
gc_base);
|
|
struct rpc_auth *auth = oldcred->cr_auth;
|
|
struct auth_cred acred = {
|
|
.uid = oldcred->cr_uid,
|
|
.principal = gss_cred->gc_principal,
|
|
.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
|
|
};
|
|
struct rpc_cred *new;
|
|
|
|
new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
task->tk_rqstp->rq_cred = new;
|
|
put_rpccred(oldcred);
|
|
return 0;
|
|
}
|
|
|
|
static int gss_cred_is_negative_entry(struct rpc_cred *cred)
|
|
{
|
|
if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
|
|
unsigned long now = jiffies;
|
|
unsigned long begin, expire;
|
|
struct gss_cred *gss_cred;
|
|
|
|
gss_cred = container_of(cred, struct gss_cred, gc_base);
|
|
begin = gss_cred->gc_upcall_timestamp;
|
|
expire = begin + gss_expired_cred_retry_delay * HZ;
|
|
|
|
if (time_in_range_open(now, begin, expire))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Refresh credentials. XXX - finish
|
|
*/
|
|
static int
|
|
gss_refresh(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
int ret = 0;
|
|
|
|
if (gss_cred_is_negative_entry(cred))
|
|
return -EKEYEXPIRED;
|
|
|
|
if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
|
|
!test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
|
|
ret = gss_renew_cred(task);
|
|
if (ret < 0)
|
|
goto out;
|
|
cred = task->tk_rqstp->rq_cred;
|
|
}
|
|
|
|
if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
|
|
ret = gss_refresh_upcall(task);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/* Dummy refresh routine: used only when destroying the context */
|
|
static int
|
|
gss_refresh_null(struct rpc_task *task)
|
|
{
|
|
return -EACCES;
|
|
}
|
|
|
|
static __be32 *
|
|
gss_validate(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
__be32 seq;
|
|
struct kvec iov;
|
|
struct xdr_buf verf_buf;
|
|
struct xdr_netobj mic;
|
|
u32 flav,len;
|
|
u32 maj_stat;
|
|
|
|
dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
|
|
|
|
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);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
if (maj_stat) {
|
|
dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
|
|
task->tk_pid, __func__, maj_stat);
|
|
goto out_bad;
|
|
}
|
|
/* We leave it to unwrap to calculate au_rslack. For now we just
|
|
* calculate the length of the verifier: */
|
|
cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
|
|
task->tk_pid, __func__);
|
|
return p + XDR_QUADLEN(len);
|
|
out_bad:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__);
|
|
return NULL;
|
|
}
|
|
|
|
static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
|
|
__be32 *p, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
|
|
encode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
static inline int
|
|
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
kxdreproc_t encode, struct rpc_rqst *rqstp,
|
|
__be32 *p, void *obj)
|
|
{
|
|
struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
|
|
struct xdr_buf integ_buf;
|
|
__be32 *integ_len = NULL;
|
|
struct xdr_netobj mic;
|
|
u32 offset;
|
|
__be32 *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);
|
|
|
|
gss_wrap_req_encode(encode, rqstp, p, obj);
|
|
|
|
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, &integ_buf, &mic);
|
|
status = -EIO; /* XXX? */
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
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 void
|
|
priv_release_snd_buf(struct rpc_rqst *rqstp)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < rqstp->rq_enc_pages_num; i++)
|
|
__free_page(rqstp->rq_enc_pages[i]);
|
|
kfree(rqstp->rq_enc_pages);
|
|
}
|
|
|
|
static int
|
|
alloc_enc_pages(struct rpc_rqst *rqstp)
|
|
{
|
|
struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
|
|
int first, last, i;
|
|
|
|
if (snd_buf->page_len == 0) {
|
|
rqstp->rq_enc_pages_num = 0;
|
|
return 0;
|
|
}
|
|
|
|
first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
|
|
last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
|
|
rqstp->rq_enc_pages_num = last - first + 1 + 1;
|
|
rqstp->rq_enc_pages
|
|
= kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
|
|
GFP_NOFS);
|
|
if (!rqstp->rq_enc_pages)
|
|
goto out;
|
|
for (i=0; i < rqstp->rq_enc_pages_num; i++) {
|
|
rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
|
|
if (rqstp->rq_enc_pages[i] == NULL)
|
|
goto out_free;
|
|
}
|
|
rqstp->rq_release_snd_buf = priv_release_snd_buf;
|
|
return 0;
|
|
out_free:
|
|
rqstp->rq_enc_pages_num = i;
|
|
priv_release_snd_buf(rqstp);
|
|
out:
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static inline int
|
|
gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
kxdreproc_t encode, struct rpc_rqst *rqstp,
|
|
__be32 *p, void *obj)
|
|
{
|
|
struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
|
|
u32 offset;
|
|
u32 maj_stat;
|
|
int status;
|
|
__be32 *opaque_len;
|
|
struct page **inpages;
|
|
int first;
|
|
int pad;
|
|
struct kvec *iov;
|
|
char *tmp;
|
|
|
|
opaque_len = p++;
|
|
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
|
|
*p++ = htonl(rqstp->rq_seqno);
|
|
|
|
gss_wrap_req_encode(encode, rqstp, p, obj);
|
|
|
|
status = alloc_enc_pages(rqstp);
|
|
if (status)
|
|
return status;
|
|
first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
|
|
inpages = snd_buf->pages + first;
|
|
snd_buf->pages = rqstp->rq_enc_pages;
|
|
snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
|
|
/*
|
|
* Give the tail its own page, in case we need extra space in the
|
|
* head when wrapping:
|
|
*
|
|
* call_allocate() allocates twice the slack space required
|
|
* by the authentication flavor to rq_callsize.
|
|
* For GSS, slack is GSS_CRED_SLACK.
|
|
*/
|
|
if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
|
|
tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
|
|
memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
|
|
snd_buf->tail[0].iov_base = tmp;
|
|
}
|
|
maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
|
|
/* slack space should prevent this ever happening: */
|
|
BUG_ON(snd_buf->len > snd_buf->buflen);
|
|
status = -EIO;
|
|
/* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
|
|
* done anyway, so it's safe to put the request on the wire: */
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
else if (maj_stat)
|
|
return status;
|
|
|
|
*opaque_len = htonl(snd_buf->len - offset);
|
|
/* 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;
|
|
pad = 3 - ((snd_buf->len - offset - 1) & 3);
|
|
memset(p, 0, pad);
|
|
iov->iov_len += pad;
|
|
snd_buf->len += pad;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gss_wrap_req(struct rpc_task *task,
|
|
kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_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: %5u %s\n", task->tk_pid, __func__);
|
|
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.
|
|
*/
|
|
gss_wrap_req_encode(encode, rqstp, p, obj);
|
|
status = 0;
|
|
goto out;
|
|
}
|
|
switch (gss_cred->gc_service) {
|
|
case RPC_GSS_SVC_NONE:
|
|
gss_wrap_req_encode(encode, rqstp, p, obj);
|
|
status = 0;
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
|
|
break;
|
|
}
|
|
out:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static inline int
|
|
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
struct rpc_rqst *rqstp, __be32 **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);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
return status;
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
|
|
struct rpc_rqst *rqstp, __be32 **p)
|
|
{
|
|
struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
|
|
u32 offset;
|
|
u32 opaque_len;
|
|
u32 maj_stat;
|
|
int status = -EIO;
|
|
|
|
opaque_len = ntohl(*(*p)++);
|
|
offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
|
|
if (offset + opaque_len > rcv_buf->len)
|
|
return status;
|
|
/* remove padding: */
|
|
rcv_buf->len = offset + opaque_len;
|
|
|
|
maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
|
|
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
return status;
|
|
if (ntohl(*(*p)++) != rqstp->rq_seqno)
|
|
return status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
|
|
__be32 *p, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
|
|
return decode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
static int
|
|
gss_unwrap_resp(struct rpc_task *task,
|
|
kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
|
|
gc_base);
|
|
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
|
|
__be32 *savedp = p;
|
|
struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
|
|
int savedlen = head->iov_len;
|
|
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:
|
|
status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
|
|
if (status)
|
|
goto out;
|
|
break;
|
|
}
|
|
/* take into account extra slack for integrity and privacy cases: */
|
|
cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
|
|
+ (savedlen - head->iov_len);
|
|
out_decode:
|
|
status = gss_unwrap_req_decode(decode, rqstp, p, obj);
|
|
out:
|
|
gss_put_ctx(ctx);
|
|
dprintk("RPC: %5u %s returning %d\n",
|
|
task->tk_pid, __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static const struct rpc_authops authgss_ops = {
|
|
.owner = THIS_MODULE,
|
|
.au_flavor = RPC_AUTH_GSS,
|
|
.au_name = "RPCSEC_GSS",
|
|
.create = gss_create,
|
|
.destroy = gss_destroy,
|
|
.lookup_cred = gss_lookup_cred,
|
|
.crcreate = gss_create_cred,
|
|
.pipes_create = gss_pipes_dentries_create,
|
|
.pipes_destroy = gss_pipes_dentries_destroy,
|
|
.list_pseudoflavors = gss_mech_list_pseudoflavors,
|
|
};
|
|
|
|
static const struct rpc_credops gss_credops = {
|
|
.cr_name = "AUTH_GSS",
|
|
.crdestroy = gss_destroy_cred,
|
|
.cr_init = gss_cred_init,
|
|
.crbind = rpcauth_generic_bind_cred,
|
|
.crmatch = gss_match,
|
|
.crmarshal = gss_marshal,
|
|
.crrefresh = gss_refresh,
|
|
.crvalidate = gss_validate,
|
|
.crwrap_req = gss_wrap_req,
|
|
.crunwrap_resp = gss_unwrap_resp,
|
|
};
|
|
|
|
static const struct rpc_credops gss_nullops = {
|
|
.cr_name = "AUTH_GSS",
|
|
.crdestroy = gss_destroy_nullcred,
|
|
.crbind = rpcauth_generic_bind_cred,
|
|
.crmatch = gss_match,
|
|
.crmarshal = gss_marshal,
|
|
.crrefresh = gss_refresh_null,
|
|
.crvalidate = gss_validate,
|
|
.crwrap_req = gss_wrap_req,
|
|
.crunwrap_resp = gss_unwrap_resp,
|
|
};
|
|
|
|
static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
|
|
.upcall = rpc_pipe_generic_upcall,
|
|
.downcall = gss_pipe_downcall,
|
|
.destroy_msg = gss_pipe_destroy_msg,
|
|
.open_pipe = gss_pipe_open_v0,
|
|
.release_pipe = gss_pipe_release,
|
|
};
|
|
|
|
static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
|
|
.upcall = rpc_pipe_generic_upcall,
|
|
.downcall = gss_pipe_downcall,
|
|
.destroy_msg = gss_pipe_destroy_msg,
|
|
.open_pipe = gss_pipe_open_v1,
|
|
.release_pipe = gss_pipe_release,
|
|
};
|
|
|
|
static __net_init int rpcsec_gss_init_net(struct net *net)
|
|
{
|
|
return gss_svc_init_net(net);
|
|
}
|
|
|
|
static __net_exit void rpcsec_gss_exit_net(struct net *net)
|
|
{
|
|
gss_svc_shutdown_net(net);
|
|
}
|
|
|
|
static struct pernet_operations rpcsec_gss_net_ops = {
|
|
.init = rpcsec_gss_init_net,
|
|
.exit = rpcsec_gss_exit_net,
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
err = register_pernet_subsys(&rpcsec_gss_net_ops);
|
|
if (err)
|
|
goto out_svc_exit;
|
|
rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
|
|
return 0;
|
|
out_svc_exit:
|
|
gss_svc_shutdown();
|
|
out_unregister:
|
|
rpcauth_unregister(&authgss_ops);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_rpcsec_gss(void)
|
|
{
|
|
unregister_pernet_subsys(&rpcsec_gss_net_ops);
|
|
gss_svc_shutdown();
|
|
rpcauth_unregister(&authgss_ops);
|
|
rcu_barrier(); /* Wait for completion of call_rcu()'s */
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_param_named(expired_cred_retry_delay,
|
|
gss_expired_cred_retry_delay,
|
|
uint, 0644);
|
|
MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
|
|
"the RPC engine retries an expired credential");
|
|
|
|
module_init(init_rpcsec_gss)
|
|
module_exit(exit_rpcsec_gss)
|