auth_gss.c 44.4 KB
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/*
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 * linux/net/sunrpc/auth_gss/auth_gss.c
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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.
 *  All rights reserved.
 *
 *  Dug Song       <dugsong@monkey.org>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/sunrpc/gss_api.h>
#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
static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;

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#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_AUTH
#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
 * 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;
	struct gss_api_mech *mech;
	enum rpc_gss_svc service;
	struct rpc_clnt *client;
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	/*
	 * There are two upcall pipes; dentry[1], named "gssd", is used
	 * for the new text-based upcall; dentry[0] is named after the
	 * mechanism (for example, "krb5") and exists for
	 * backwards-compatibility with older gssd's.
	 */
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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. */
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);
static struct rpc_wait_queue pipe_version_rpc_waitqueue;
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;
static const struct rpc_pipe_ops gss_upcall_ops_v1;
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static inline struct gss_cl_ctx *
gss_get_ctx(struct gss_cl_ctx *ctx)
{
	atomic_inc(&ctx->count);
	return ctx;
}

static inline void
gss_put_ctx(struct gss_cl_ctx *ctx)
{
	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:
 * called by gss_upcall_callback and gss_create_upcall in order
 * 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
gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
{
	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))
		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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}

static const void *
simple_get_bytes(const void *p, const void *end, void *res, size_t len)
{
	const void *q = (const void *)((const char *)p + len);
	if (unlikely(q > end || q < p))
		return ERR_PTR(-EFAULT);
	memcpy(res, p, len);
	return q;
}

static inline const void *
simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
{
	const void *q;
	unsigned int len;

	p = simple_get_bytes(p, end, &len, sizeof(len));
	if (IS_ERR(p))
		return p;
	q = (const void *)((const char *)p + len);
	if (unlikely(q > end || q < p))
		return ERR_PTR(-EFAULT);
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	dest->data = kmemdup(p, len, GFP_NOFS);
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	if (unlikely(dest->data == NULL))
		return ERR_PTR(-ENOMEM);
	dest->len = len;
	return q;
}

static struct gss_cl_ctx *
gss_cred_get_ctx(struct rpc_cred *cred)
{
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
	struct gss_cl_ctx *ctx = NULL;

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	rcu_read_lock();
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	if (gss_cred->gc_ctx)
		ctx = gss_get_ctx(gss_cred->gc_ctx);
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	rcu_read_unlock();
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	return ctx;
}

static struct gss_cl_ctx *
gss_alloc_context(void)
{
	struct gss_cl_ctx *ctx;

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	ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
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	if (ctx != NULL) {
		ctx->gc_proc = RPC_GSS_PROC_DATA;
		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
		spin_lock_init(&ctx->gc_seq_lock);
		atomic_set(&ctx->count,1);
	}
	return ctx;
}

#define GSSD_MIN_TIMEOUT (60 * 60)
static const void *
gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
{
	const void *q;
	unsigned int seclen;
	unsigned int timeout;
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	unsigned long now = jiffies;
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	u32 window_size;
	int ret;

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	/* First unsigned int gives the remaining lifetime in seconds of the
	 * credential - e.g. the remaining TGT lifetime for Kerberos or
	 * the -t value passed to GSSD.
	 */
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	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
	if (IS_ERR(p))
		goto err;
	if (timeout == 0)
		timeout = GSSD_MIN_TIMEOUT;
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	ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
	/* 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));
	if (IS_ERR(p))
		goto err;
	ctx->gc_win = window_size;
	/* gssd signals an error by passing ctx->gc_win = 0: */
	if (ctx->gc_win == 0) {
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		/*
		 * in which case, p points to an error code. Anything other
		 * than -EKEYEXPIRED gets converted to -EACCES.
		 */
		p = simple_get_bytes(p, end, &ret, sizeof(ret));
		if (!IS_ERR(p))
			p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
						    ERR_PTR(-EACCES);
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		goto err;
	}
	/* copy the opaque wire context */
	p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
	if (IS_ERR(p))
		goto err;
	/* import the opaque security context */
	p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
	if (IS_ERR(p))
		goto err;
	q = (const void *)((const char *)p + seclen);
	if (unlikely(q > end || q < p)) {
		p = ERR_PTR(-EFAULT);
		goto err;
	}
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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) {
		p = ERR_PTR(ret);
		goto err;
	}
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	dprintk("RPC:       %s Success. gc_expiry %lu now %lu timeout %u\n",
		__func__, ctx->gc_expiry, now, timeout);
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	return q;
err:
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	dprintk("RPC:       %s returns %ld gc_expiry %lu now %lu timeout %u\n",
		__func__, -PTR_ERR(p), ctx->gc_expiry, now, timeout);
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	return p;
}

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#define UPCALL_BUF_LEN 128
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struct gss_upcall_msg {
	atomic_t count;
	uid_t	uid;
	struct rpc_pipe_msg msg;
	struct list_head list;
	struct gss_auth *auth;
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	struct rpc_pipe *pipe;
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	struct rpc_wait_queue rpc_waitqueue;
	wait_queue_head_t waitqueue;
	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)
{
	int ret;

	spin_lock(&pipe_version_lock);
	if (pipe_version >= 0) {
		atomic_inc(&pipe_users);
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		ret = pipe_version;
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	} else
		ret = -EAGAIN;
	spin_unlock(&pipe_version_lock);
	return ret;
}

static void put_pipe_version(void)
{
	if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
		pipe_version = -1;
		spin_unlock(&pipe_version_lock);
	}
}

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static void
gss_release_msg(struct gss_upcall_msg *gss_msg)
{
	if (!atomic_dec_and_test(&gss_msg->count))
		return;
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	put_pipe_version();
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	BUG_ON(!list_empty(&gss_msg->list));
	if (gss_msg->ctx != NULL)
		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);
}

static struct gss_upcall_msg *
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__gss_find_upcall(struct rpc_pipe *pipe, uid_t uid)
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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)
			continue;
		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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	dprintk("RPC:       %s found nothing\n", __func__);
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	return NULL;
}

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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
 * to that upcall instead of adding the new upcall.
 */
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);
	old = __gss_find_upcall(pipe, gss_msg->uid);
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	if (old == NULL) {
		atomic_inc(&gss_msg->count);
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		list_add(&gss_msg->list, &pipe->in_downcall);
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	} else
		gss_msg = old;
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	spin_unlock(&pipe->lock);
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	return gss_msg;
}

static void
__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
{
	list_del_init(&gss_msg->list);
	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
	wake_up_all(&gss_msg->waitqueue);
	atomic_dec(&gss_msg->count);
}

static void
gss_unhash_msg(struct gss_upcall_msg *gss_msg)
{
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	struct rpc_pipe *pipe = gss_msg->pipe;
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	if (list_empty(&gss_msg->list))
		return;
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	spin_lock(&pipe->lock);
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	if (!list_empty(&gss_msg->list))
		__gss_unhash_msg(gss_msg);
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	spin_unlock(&pipe->lock);
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}

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static void
gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
{
	switch (gss_msg->msg.errno) {
	case 0:
		if (gss_msg->ctx == NULL)
			break;
		clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
		gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
		break;
	case -EKEYEXPIRED:
		set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
	}
	gss_cred->gc_upcall_timestamp = jiffies;
	gss_cred->gc_upcall = NULL;
	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
}

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static void
gss_upcall_callback(struct rpc_task *task)
{
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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);
	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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	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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static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
{
	gss_msg->msg.data = &gss_msg->uid;
	gss_msg->msg.len = sizeof(gss_msg->uid);
}

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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)
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{
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	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) {
		len = sprintf(p, "target=%s ", clnt->cl_principal);
		p += len;
		gss_msg->msg.len += len;
	}
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	if (service_name != NULL) {
		len = sprintf(p, "service=%s ", service_name);
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		p += len;
		gss_msg->msg.len += len;
	}
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	if (mech->gm_upcall_enctypes) {
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		len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes);
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		p += len;
		gss_msg->msg.len += len;
	}
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	len = sprintf(p, "\n");
	gss_msg->msg.len += len;

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	gss_msg->msg.data = gss_msg->databuf;
	BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
}

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static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
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				struct rpc_clnt *clnt,
				const char *service_name)
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{
	if (pipe_version == 0)
		gss_encode_v0_msg(gss_msg);
	else /* pipe_version == 1 */
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		gss_encode_v1_msg(gss_msg, clnt, service_name);
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}

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static struct gss_upcall_msg *
gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt,
		uid_t uid, const char *service_name)
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{
	struct gss_upcall_msg *gss_msg;
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	int vers;
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	gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
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	if (gss_msg == NULL)
		return ERR_PTR(-ENOMEM);
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	vers = get_pipe_version();
	if (vers < 0) {
		kfree(gss_msg);
		return ERR_PTR(vers);
	}
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	gss_msg->pipe = gss_auth->pipe[vers];
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	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;
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	gss_encode_msg(gss_msg, clnt, service_name);
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	return gss_msg;
}

static struct gss_upcall_msg *
gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
{
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	struct gss_cred *gss_cred = container_of(cred,
			struct gss_cred, gc_base);
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	struct gss_upcall_msg *gss_new, *gss_msg;
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	uid_t uid = cred->cr_uid;
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	gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal);
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	if (IS_ERR(gss_new))
		return gss_new;
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	gss_msg = gss_add_msg(gss_new);
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	if (gss_msg == gss_new) {
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		int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
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		if (res) {
			gss_unhash_msg(gss_new);
			gss_msg = ERR_PTR(res);
		}
	} else
		gss_release_msg(gss_new);
	return gss_msg;
}

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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;
	}
}

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static inline int
gss_refresh_upcall(struct rpc_task *task)
{
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	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
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	struct gss_auth *gss_auth = container_of(cred->cr_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;
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	struct rpc_pipe *pipe;
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	int err = 0;

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	dprintk("RPC: %5u %s for uid %u\n",
		task->tk_pid, __func__, cred->cr_uid);
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	gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
R
Roel Kluin 已提交
522
	if (PTR_ERR(gss_msg) == -EAGAIN) {
523 524 525 526 527
		/* 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);
528
		return -EAGAIN;
529
	}
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Linus Torvalds 已提交
530 531 532 533
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
534 535
	pipe = gss_msg->pipe;
	spin_lock(&pipe->lock);
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Linus Torvalds 已提交
536
	if (gss_cred->gc_upcall != NULL)
537
		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
538
	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
L
Linus Torvalds 已提交
539 540 541 542
		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);
543
		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
544 545
	} else {
		gss_handle_downcall_result(gss_cred, gss_msg);
L
Linus Torvalds 已提交
546
		err = gss_msg->msg.errno;
547
	}
548
	spin_unlock(&pipe->lock);
L
Linus Torvalds 已提交
549 550
	gss_release_msg(gss_msg);
out:
551 552
	dprintk("RPC: %5u %s for uid %u result %d\n",
		task->tk_pid, __func__, cred->cr_uid, err);
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553 554 555 556 557 558
	return err;
}

static inline int
gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
{
559
	struct rpc_pipe *pipe;
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560 561 562 563 564
	struct rpc_cred *cred = &gss_cred->gc_base;
	struct gss_upcall_msg *gss_msg;
	DEFINE_WAIT(wait);
	int err = 0;

565
	dprintk("RPC:       %s for uid %u\n", __func__, cred->cr_uid);
566
retry:
L
Linus Torvalds 已提交
567
	gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
568 569 570
	if (PTR_ERR(gss_msg) == -EAGAIN) {
		err = wait_event_interruptible_timeout(pipe_version_waitqueue,
				pipe_version >= 0, 15*HZ);
571 572 573 574
		if (pipe_version < 0) {
			warn_gssd();
			err = -EACCES;
		}
575 576 577 578
		if (err)
			goto out;
		goto retry;
	}
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579 580 581 582
	if (IS_ERR(gss_msg)) {
		err = PTR_ERR(gss_msg);
		goto out;
	}
583
	pipe = gss_msg->pipe;
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Linus Torvalds 已提交
584
	for (;;) {
585
		prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
586
		spin_lock(&pipe->lock);
L
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587 588 589
		if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
			break;
		}
590
		spin_unlock(&pipe->lock);
591
		if (fatal_signal_pending(current)) {
L
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592 593 594 595 596 597
			err = -ERESTARTSYS;
			goto out_intr;
		}
		schedule();
	}
	if (gss_msg->ctx)
598
		gss_cred_set_ctx(cred, gss_msg->ctx);
L
Linus Torvalds 已提交
599 600
	else
		err = gss_msg->msg.errno;
601
	spin_unlock(&pipe->lock);
L
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602 603 604 605
out_intr:
	finish_wait(&gss_msg->waitqueue, &wait);
	gss_release_msg(gss_msg);
out:
606 607
	dprintk("RPC:       %s for uid %u result %d\n",
		__func__, cred->cr_uid, err);
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608 609 610 611 612 613 614 615 616 617 618
	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;
619
	struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe;
L
Linus Torvalds 已提交
620 621
	struct gss_cl_ctx *ctx;
	uid_t uid;
622
	ssize_t err = -EFBIG;
L
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623 624 625 626

	if (mlen > MSG_BUF_MAXSIZE)
		goto out;
	err = -ENOMEM;
627
	buf = kmalloc(mlen, GFP_NOFS);
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628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
	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;
646 647 648

	err = -ENOENT;
	/* Find a matching upcall */
649 650
	spin_lock(&pipe->lock);
	gss_msg = __gss_find_upcall(pipe, uid);
651
	if (gss_msg == NULL) {
652
		spin_unlock(&pipe->lock);
653 654 655
		goto err_put_ctx;
	}
	list_del_init(&gss_msg->list);
656
	spin_unlock(&pipe->lock);
657

658
	p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
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Linus Torvalds 已提交
659 660
	if (IS_ERR(p)) {
		err = PTR_ERR(p);
661 662
		switch (err) {
		case -EACCES:
663
		case -EKEYEXPIRED:
664 665 666 667 668 669 670 671 672 673 674
			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 "
R
Randy Dunlap 已提交
675
				"gss_fill_context: %zd\n", __func__, err);
676 677
			BUG();
		}
678
		goto err_release_msg;
L
Linus Torvalds 已提交
679
	}
680 681 682 683
	gss_msg->ctx = gss_get_ctx(ctx);
	err = mlen;

err_release_msg:
684
	spin_lock(&pipe->lock);
685
	__gss_unhash_msg(gss_msg);
686
	spin_unlock(&pipe->lock);
687
	gss_release_msg(gss_msg);
L
Linus Torvalds 已提交
688 689 690 691 692
err_put_ctx:
	gss_put_ctx(ctx);
err:
	kfree(buf);
out:
693
	dprintk("RPC:       %s returning %Zd\n", __func__, err);
L
Linus Torvalds 已提交
694 695 696
	return err;
}

\
\"J. Bruce Fields\ 已提交
697
static int gss_pipe_open(struct inode *inode, int new_version)
698
{
\
\"J. Bruce Fields\ 已提交
699 700
	int ret = 0;

701 702
	spin_lock(&pipe_version_lock);
	if (pipe_version < 0) {
\
\"J. Bruce Fields\ 已提交
703 704
		/* First open of any gss pipe determines the version: */
		pipe_version = new_version;
705 706
		rpc_wake_up(&pipe_version_rpc_waitqueue);
		wake_up(&pipe_version_waitqueue);
\
\"J. Bruce Fields\ 已提交
707 708 709 710
	} else if (pipe_version != new_version) {
		/* Trying to open a pipe of a different version */
		ret = -EBUSY;
		goto out;
711
	}
712
	atomic_inc(&pipe_users);
\
\"J. Bruce Fields\ 已提交
713
out:
714
	spin_unlock(&pipe_version_lock);
\
\"J. Bruce Fields\ 已提交
715 716 717 718 719 720 721 722 723 724 725 726
	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);
727 728
}

L
Linus Torvalds 已提交
729 730 731
static void
gss_pipe_release(struct inode *inode)
{
732
	struct rpc_pipe *pipe = RPC_I(inode)->pipe;
733
	struct gss_upcall_msg *gss_msg;
L
Linus Torvalds 已提交
734

735
restart:
736 737
	spin_lock(&pipe->lock);
	list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
L
Linus Torvalds 已提交
738

739 740
		if (!list_empty(&gss_msg->msg.list))
			continue;
L
Linus Torvalds 已提交
741 742 743
		gss_msg->msg.errno = -EPIPE;
		atomic_inc(&gss_msg->count);
		__gss_unhash_msg(gss_msg);
744
		spin_unlock(&pipe->lock);
L
Linus Torvalds 已提交
745
		gss_release_msg(gss_msg);
746
		goto restart;
L
Linus Torvalds 已提交
747
	}
748
	spin_unlock(&pipe->lock);
749

750
	put_pipe_version();
L
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751 752 753 754 755 756 757 758
}

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) {
759 760
		dprintk("RPC:       %s releasing msg %p\n",
			__func__, gss_msg);
L
Linus Torvalds 已提交
761 762
		atomic_inc(&gss_msg->count);
		gss_unhash_msg(gss_msg);
763 764
		if (msg->errno == -ETIMEDOUT)
			warn_gssd();
L
Linus Torvalds 已提交
765 766 767 768
		gss_release_msg(gss_msg);
	}
}

769 770 771 772 773
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);
774 775 776 777
	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);
778 779 780 781 782 783 784 785 786 787 788
}

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;

789
	gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
790 791 792 793
						      "gssd",
						      clnt, gss_auth->pipe[1]);
	if (IS_ERR(gss_auth->pipe[1]->dentry))
		return PTR_ERR(gss_auth->pipe[1]->dentry);
794
	gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
						      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)
{
811
	struct net *net = rpc_net_ns(clnt);
812 813 814 815
	struct super_block *sb;

	sb = rpc_get_sb_net(net);
	if (sb) {
816
		if (clnt->cl_dentry)
817 818 819 820 821 822 823 824
			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)
{
825
	struct net *net = rpc_net_ns(clnt);
826 827 828 829 830
	struct super_block *sb;
	int err = 0;

	sb = rpc_get_sb_net(net);
	if (sb) {
831
		if (clnt->cl_dentry)
832 833 834 835 836 837
			err = gss_pipes_dentries_create(auth);
		rpc_put_sb_net(net);
	}
	return err;
}

838 839
/*
 * NOTE: we have the opportunity to use different
L
Linus Torvalds 已提交
840 841 842 843 844 845 846
 * 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;
847
	int err = -ENOMEM; /* XXX? */
L
Linus Torvalds 已提交
848

849
	dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
L
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850 851

	if (!try_module_get(THIS_MODULE))
852
		return ERR_PTR(err);
L
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853 854 855
	if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
		goto out_dec;
	gss_auth->client = clnt;
856
	err = -EINVAL;
L
Linus Torvalds 已提交
857 858
	gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
	if (!gss_auth->mech) {
859
		printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
860
				__func__, flavor);
L
Linus Torvalds 已提交
861 862 863
		goto err_free;
	}
	gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
864 865
	if (gss_auth->service == 0)
		goto err_put_mech;
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Linus Torvalds 已提交
866 867 868 869 870 871
	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);
872
	kref_init(&gss_auth->kref);
L
Linus Torvalds 已提交
873

\
\"J. Bruce Fields\ 已提交
874 875 876 877 878 879
	/*
	 * 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.
	 */
880 881 882 883
	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]);
L
Linus Torvalds 已提交
884
		goto err_put_mech;
885
	}
L
Linus Torvalds 已提交
886

887 888 889 890 891 892
	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;
	}
893 894
	err = gss_pipes_dentries_create_net(clnt, auth);
	if (err)
895
		goto err_destroy_pipe_0;
896
	err = rpcauth_init_credcache(auth);
897
	if (err)
898
		goto err_unlink_pipes;
899

L
Linus Torvalds 已提交
900
	return auth;
901 902
err_unlink_pipes:
	gss_pipes_dentries_destroy_net(clnt, auth);
903 904 905 906
err_destroy_pipe_0:
	rpc_destroy_pipe_data(gss_auth->pipe[0]);
err_destroy_pipe_1:
	rpc_destroy_pipe_data(gss_auth->pipe[1]);
L
Linus Torvalds 已提交
907 908 909 910 911 912
err_put_mech:
	gss_mech_put(gss_auth->mech);
err_free:
	kfree(gss_auth);
out_dec:
	module_put(THIS_MODULE);
913
	return ERR_PTR(err);
L
Linus Torvalds 已提交
914 915
}

916 917 918
static void
gss_free(struct gss_auth *gss_auth)
{
919
	gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth);
920 921
	rpc_destroy_pipe_data(gss_auth->pipe[0]);
	rpc_destroy_pipe_data(gss_auth->pipe[1]);
922 923 924 925 926 927 928 929 930 931 932 933 934 935
	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);
}

L
Linus Torvalds 已提交
936 937 938 939 940
static void
gss_destroy(struct rpc_auth *auth)
{
	struct gss_auth *gss_auth;

941 942
	dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
			auth, auth->au_flavor);
L
Linus Torvalds 已提交
943

944 945
	rpcauth_destroy_credcache(auth);

L
Linus Torvalds 已提交
946
	gss_auth = container_of(auth, struct gss_auth, rpc_auth);
947
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
948 949
}

950 951 952 953 954 955 956 957 958 959 960 961 962 963
/*
 * 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 ||
964
	    test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
965 966 967 968 969 970 971 972 973
		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);

974
	task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
975 976 977 978 979 980 981 982
	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
L
Linus Torvalds 已提交
983 984 985
 * to create a new cred or context, so they check that things have been
 * allocated before freeing them. */
static void
986
gss_do_free_ctx(struct gss_cl_ctx *ctx)
L
Linus Torvalds 已提交
987
{
988
	dprintk("RPC:       %s\n", __func__);
L
Linus Torvalds 已提交
989

990
	gss_delete_sec_context(&ctx->gc_gss_ctx);
L
Linus Torvalds 已提交
991 992 993 994
	kfree(ctx->gc_wire_ctx.data);
	kfree(ctx);
}

995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
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);
}

L
Linus Torvalds 已提交
1008
static void
1009
gss_free_cred(struct gss_cred *gss_cred)
L
Linus Torvalds 已提交
1010
{
1011
	dprintk("RPC:       %s cred=%p\n", __func__, gss_cred);
1012 1013
	kfree(gss_cred);
}
L
Linus Torvalds 已提交
1014

1015 1016 1017 1018 1019 1020
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);
}
L
Linus Torvalds 已提交
1021

1022
static void
1023
gss_destroy_nullcred(struct rpc_cred *cred)
1024
{
1025
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1026
	struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1027 1028
	struct gss_cl_ctx *ctx = gss_cred->gc_ctx;

1029
	RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1030
	call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1031 1032
	if (ctx)
		gss_put_ctx(ctx);
1033
	kref_put(&gss_auth->kref, gss_free_callback);
L
Linus Torvalds 已提交
1034 1035
}

1036 1037 1038 1039 1040 1041 1042 1043 1044
static void
gss_destroy_cred(struct rpc_cred *cred)
{

	if (gss_destroying_context(cred))
		return;
	gss_destroy_nullcred(cred);
}

L
Linus Torvalds 已提交
1045 1046 1047 1048
/*
 * Lookup RPCSEC_GSS cred for the current process
 */
static struct rpc_cred *
1049
gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
Linus Torvalds 已提交
1050
{
1051
	return rpcauth_lookup_credcache(auth, acred, flags);
L
Linus Torvalds 已提交
1052 1053 1054
}

static struct rpc_cred *
1055
gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
L
Linus Torvalds 已提交
1056 1057 1058 1059 1060
{
	struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
	struct gss_cred	*cred = NULL;
	int err = -ENOMEM;

1061 1062
	dprintk("RPC:       %s for uid %d, flavor %d\n",
		__func__, acred->uid, auth->au_flavor);
L
Linus Torvalds 已提交
1063

1064
	if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
L
Linus Torvalds 已提交
1065 1066
		goto out_err;

1067
	rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
L
Linus Torvalds 已提交
1068 1069 1070 1071
	/*
	 * Note: in order to force a call to call_refresh(), we deliberately
	 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
	 */
1072
	cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
L
Linus Torvalds 已提交
1073
	cred->gc_service = gss_auth->service;
1074 1075 1076
	cred->gc_principal = NULL;
	if (acred->machine_cred)
		cred->gc_principal = acred->principal;
1077
	kref_get(&gss_auth->kref);
L
Linus Torvalds 已提交
1078 1079 1080
	return &cred->gc_base;

out_err:
1081
	dprintk("RPC:       %s failed with error %d\n", __func__, err);
L
Linus Torvalds 已提交
1082 1083 1084
	return ERR_PTR(err);
}

1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
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;
}

L
Linus Torvalds 已提交
1098
static int
1099
gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
L
Linus Torvalds 已提交
1100 1101 1102
{
	struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);

1103
	if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1104
		goto out;
L
Linus Torvalds 已提交
1105
	/* Don't match with creds that have expired. */
1106 1107 1108
	if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
		return 0;
	if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
L
Linus Torvalds 已提交
1109
		return 0;
1110
out:
1111 1112 1113 1114 1115 1116
	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)
1117
		return 0;
E
Eric Dumazet 已提交
1118
	return rc->cr_uid == acred->uid;
L
Linus Torvalds 已提交
1119 1120 1121 1122 1123 1124
}

/*
* Marshal credentials.
* Maybe we should keep a cached credential for performance reasons.
*/
1125 1126
static __be32 *
gss_marshal(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1127
{
1128 1129
	struct rpc_rqst *req = task->tk_rqstp;
	struct rpc_cred *cred = req->rq_cred;
L
Linus Torvalds 已提交
1130 1131 1132
	struct gss_cred	*gss_cred = container_of(cred, struct gss_cred,
						 gc_base);
	struct gss_cl_ctx	*ctx = gss_cred_get_ctx(cred);
1133
	__be32		*cred_len;
L
Linus Torvalds 已提交
1134 1135 1136 1137 1138
	u32             maj_stat = 0;
	struct xdr_netobj mic;
	struct kvec	iov;
	struct xdr_buf	verf_buf;

1139
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156

	*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: */
1157
	iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1158
					req->rq_snd_buf.head[0].iov_base);
L
Linus Torvalds 已提交
1159 1160 1161 1162 1163 1164 1165
	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);
1166
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1167
	if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1168
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	} 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;
}

1181 1182
static int gss_renew_cred(struct rpc_task *task)
{
1183
	struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1184 1185 1186 1187 1188 1189
	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,
1190 1191
		.principal = gss_cred->gc_principal,
		.machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1192 1193 1194 1195 1196 1197
	};
	struct rpc_cred *new;

	new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
	if (IS_ERR(new))
		return PTR_ERR(new);
1198
	task->tk_rqstp->rq_cred = new;
1199 1200 1201 1202
	put_rpccred(oldcred);
	return 0;
}

1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
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;
}

L
Linus Torvalds 已提交
1220 1221 1222 1223 1224 1225
/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
1226
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1227 1228
	int ret = 0;

1229 1230 1231
	if (gss_cred_is_negative_entry(cred))
		return -EKEYEXPIRED;

1232 1233 1234 1235 1236
	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;
1237
		cred = task->tk_rqstp->rq_cred;
1238
	}
L
Linus Torvalds 已提交
1239

1240 1241 1242 1243
	if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
		ret = gss_refresh_upcall(task);
out:
	return ret;
L
Linus Torvalds 已提交
1244 1245
}

1246 1247 1248 1249 1250 1251 1252
/* Dummy refresh routine: used only when destroying the context */
static int
gss_refresh_null(struct rpc_task *task)
{
	return -EACCES;
}

1253 1254
static __be32 *
gss_validate(struct rpc_task *task, __be32 *p)
L
Linus Torvalds 已提交
1255
{
1256
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1257
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1258
	__be32		seq;
L
Linus Torvalds 已提交
1259 1260 1261 1262 1263 1264
	struct kvec	iov;
	struct xdr_buf	verf_buf;
	struct xdr_netobj mic;
	u32		flav,len;
	u32		maj_stat;

1265
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1266 1267 1268

	flav = ntohl(*p++);
	if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1269
		goto out_bad;
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278
	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;

1279
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
L
Linus Torvalds 已提交
1280
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1281
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1282
	if (maj_stat) {
1283 1284
		dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
			task->tk_pid, __func__, maj_stat);
L
Linus Torvalds 已提交
1285
		goto out_bad;
1286
	}
1287 1288
	/* We leave it to unwrap to calculate au_rslack. For now we just
	 * calculate the length of the verifier: */
1289
	cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
L
Linus Torvalds 已提交
1290
	gss_put_ctx(ctx);
1291 1292
	dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
			task->tk_pid, __func__);
L
Linus Torvalds 已提交
1293 1294 1295
	return p + XDR_QUADLEN(len);
out_bad:
	gss_put_ctx(ctx);
1296
	dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1297 1298 1299
	return NULL;
}

1300 1301 1302 1303 1304 1305 1306 1307 1308
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);
}

L
Linus Torvalds 已提交
1309 1310
static inline int
gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1311 1312
		   kxdreproc_t encode, struct rpc_rqst *rqstp,
		   __be32 *p, void *obj)
L
Linus Torvalds 已提交
1313 1314 1315
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	struct xdr_buf	integ_buf;
1316
	__be32          *integ_len = NULL;
L
Linus Torvalds 已提交
1317
	struct xdr_netobj mic;
1318 1319
	u32		offset;
	__be32		*q;
L
Linus Torvalds 已提交
1320 1321 1322 1323 1324 1325 1326 1327
	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);

1328
	gss_wrap_req_encode(encode, rqstp, p, obj);
L
Linus Torvalds 已提交
1329 1330 1331 1332 1333 1334 1335

	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: */
1336
	if (snd_buf->page_len || snd_buf->tail[0].iov_len)
L
Linus Torvalds 已提交
1337 1338 1339 1340 1341 1342
		iov = snd_buf->tail;
	else
		iov = snd_buf->head;
	p = iov->iov_base + iov->iov_len;
	mic.data = (u8 *)(p + 1);

1343
	maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
L
Linus Torvalds 已提交
1344 1345
	status = -EIO; /* XXX? */
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1346
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
L
Linus Torvalds 已提交
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
	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;
}

1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
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:
1394 1395
	rqstp->rq_enc_pages_num = i;
	priv_release_snd_buf(rqstp);
1396 1397 1398 1399 1400 1401
out:
	return -EAGAIN;
}

static inline int
gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1402 1403
		  kxdreproc_t encode, struct rpc_rqst *rqstp,
		  __be32 *p, void *obj)
1404 1405 1406 1407 1408
{
	struct xdr_buf	*snd_buf = &rqstp->rq_snd_buf;
	u32		offset;
	u32             maj_stat;
	int		status;
1409
	__be32		*opaque_len;
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
	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);

1420
	gss_wrap_req_encode(encode, rqstp, p, obj);
1421 1422 1423 1424 1425 1426 1427 1428

	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;
1429 1430 1431 1432 1433 1434 1435 1436
	/*
	 * 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.
	 */
1437 1438 1439 1440 1441
	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;
	}
1442
	maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1443
	/* slack space should prevent this ever happening: */
1444
	BUG_ON(snd_buf->len > snd_buf->buflen);
1445
	status = -EIO;
1446 1447 1448
	/* 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)
1449
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
	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;
}

L
Linus Torvalds 已提交
1468 1469
static int
gss_wrap_req(struct rpc_task *task,
1470
	     kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1471
{
1472
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477
	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;

1478
	dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
L
Linus Torvalds 已提交
1479 1480 1481 1482
	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.
		 */
1483 1484
		gss_wrap_req_encode(encode, rqstp, p, obj);
		status = 0;
L
Linus Torvalds 已提交
1485 1486 1487
		goto out;
	}
	switch (gss_cred->gc_service) {
J
Joe Perches 已提交
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
	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;
L
Linus Torvalds 已提交
1498 1499 1500
	}
out:
	gss_put_ctx(ctx);
1501
	dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
L
Linus Torvalds 已提交
1502 1503 1504 1505 1506
	return status;
}

static inline int
gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1507
		struct rpc_rqst *rqstp, __be32 **p)
L
Linus Torvalds 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
{
	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;

1534
	maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
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Linus Torvalds 已提交
1535
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1536
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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1537 1538 1539 1540 1541
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	return 0;
}

1542 1543
static inline int
gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1544
		struct rpc_rqst *rqstp, __be32 **p)
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558
{
	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;

1559
	maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1560
	if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1561
		clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1562 1563 1564 1565 1566 1567 1568 1569
	if (maj_stat != GSS_S_COMPLETE)
		return status;
	if (ntohl(*(*p)++) != rqstp->rq_seqno)
		return status;

	return 0;
}

1570 1571 1572 1573 1574 1575 1576 1577 1578
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);
}
1579

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1580 1581
static int
gss_unwrap_resp(struct rpc_task *task,
1582
		kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
L
Linus Torvalds 已提交
1583
{
1584
	struct rpc_cred *cred = task->tk_rqstp->rq_cred;
L
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1585 1586 1587
	struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
			gc_base);
	struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1588
	__be32		*savedp = p;
1589 1590
	struct kvec	*head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
	int		savedlen = head->iov_len;
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1591 1592 1593 1594 1595
	int             status = -EIO;

	if (ctx->gc_proc != RPC_GSS_PROC_DATA)
		goto out_decode;
	switch (gss_cred->gc_service) {
J
Joe Perches 已提交
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
	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;
L
Linus Torvalds 已提交
1608
	}
1609
	/* take into account extra slack for integrity and privacy cases: */
1610
	cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1611
						+ (savedlen - head->iov_len);
L
Linus Torvalds 已提交
1612
out_decode:
1613
	status = gss_unwrap_req_decode(decode, rqstp, p, obj);
L
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1614 1615
out:
	gss_put_ctx(ctx);
1616 1617
	dprintk("RPC: %5u %s returning %d\n",
		task->tk_pid, __func__, status);
L
Linus Torvalds 已提交
1618 1619
	return status;
}
1620

1621
static const struct rpc_authops authgss_ops = {
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1622 1623 1624 1625 1626 1627
	.owner		= THIS_MODULE,
	.au_flavor	= RPC_AUTH_GSS,
	.au_name	= "RPCSEC_GSS",
	.create		= gss_create,
	.destroy	= gss_destroy,
	.lookup_cred	= gss_lookup_cred,
1628 1629 1630
	.crcreate	= gss_create_cred,
	.pipes_create	= gss_pipes_dentries_create,
	.pipes_destroy	= gss_pipes_dentries_destroy,
C
Chuck Lever 已提交
1631
	.list_pseudoflavors = gss_mech_list_pseudoflavors,
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1632 1633
};

1634
static const struct rpc_credops gss_credops = {
L
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1635 1636
	.cr_name	= "AUTH_GSS",
	.crdestroy	= gss_destroy_cred,
1637
	.cr_init	= gss_cred_init,
1638
	.crbind		= rpcauth_generic_bind_cred,
L
Linus Torvalds 已提交
1639 1640 1641 1642 1643 1644 1645 1646
	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1647 1648
static const struct rpc_credops gss_nullops = {
	.cr_name	= "AUTH_GSS",
1649
	.crdestroy	= gss_destroy_nullcred,
1650
	.crbind		= rpcauth_generic_bind_cred,
1651 1652 1653 1654 1655 1656 1657 1658
	.crmatch	= gss_match,
	.crmarshal	= gss_marshal,
	.crrefresh	= gss_refresh_null,
	.crvalidate	= gss_validate,
	.crwrap_req	= gss_wrap_req,
	.crunwrap_resp	= gss_unwrap_resp,
};

1659
static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
1660
	.upcall		= rpc_pipe_generic_upcall,
\
\"J. Bruce Fields\ 已提交
1661 1662 1663 1664 1665 1666
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
	.open_pipe	= gss_pipe_open_v0,
	.release_pipe	= gss_pipe_release,
};

1667
static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
1668
	.upcall		= rpc_pipe_generic_upcall,
L
Linus Torvalds 已提交
1669 1670
	.downcall	= gss_pipe_downcall,
	.destroy_msg	= gss_pipe_destroy_msg,
\
\"J. Bruce Fields\ 已提交
1671
	.open_pipe	= gss_pipe_open_v1,
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Linus Torvalds 已提交
1672 1673 1674
	.release_pipe	= gss_pipe_release,
};

1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
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,
};

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Linus Torvalds 已提交
1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
/*
 * 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;
1703 1704 1705
	err = register_pernet_subsys(&rpcsec_gss_net_ops);
	if (err)
		goto out_svc_exit;
1706
	rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
L
Linus Torvalds 已提交
1707
	return 0;
1708 1709
out_svc_exit:
	gss_svc_shutdown();
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1710 1711 1712 1713 1714 1715 1716 1717
out_unregister:
	rpcauth_unregister(&authgss_ops);
out:
	return err;
}

static void __exit exit_rpcsec_gss(void)
{
1718
	unregister_pernet_subsys(&rpcsec_gss_net_ops);
L
Linus Torvalds 已提交
1719 1720
	gss_svc_shutdown();
	rpcauth_unregister(&authgss_ops);
1721
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
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Linus Torvalds 已提交
1722 1723 1724
}

MODULE_LICENSE("GPL");
1725 1726 1727 1728 1729 1730
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");

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Linus Torvalds 已提交
1731 1732
module_init(init_rpcsec_gss)
module_exit(exit_rpcsec_gss)