ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/net/sunrpc/auth_gss/auth_gss.c b/marvell/linux/net/sunrpc/auth_gss/auth_gss.c
new file mode 100644
index 0000000..a1aa4f3
--- /dev/null
+++ b/marvell/linux/net/sunrpc/auth_gss/auth_gss.c
@@ -0,0 +1,2261 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * linux/net/sunrpc/auth_gss/auth_gss.c
+ *
+ * RPCSEC_GSS client authentication.
+ *
+ * Copyright (c) 2000 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Dug Song <dugsong@monkey.org>
+ * Andy Adamson <andros@umich.edu>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/gss_krb5.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 <linux/uaccess.h>
+#include <linux/hashtable.h>
+
+#include "auth_gss_internal.h"
+#include "../netns.h"
+
+#include <trace/events/rpcgss.h>
+
+static const struct rpc_authops authgss_ops;
+
+static const struct rpc_credops gss_credops;
+static const struct rpc_credops gss_nullops;
+
+#define GSS_RETRY_EXPIRED 5
+static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
+
+#define GSS_KEY_EXPIRE_TIMEO 240
+static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+#define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
+/* length of a krb5 verifier (48), plus data added before arguments when
+ * using integrity (two 4-byte integers): */
+#define GSS_VERF_SLACK 100
+
+static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
+static DEFINE_SPINLOCK(gss_auth_hash_lock);
+
+struct gss_pipe {
+ struct rpc_pipe_dir_object pdo;
+ struct rpc_pipe *pipe;
+ struct rpc_clnt *clnt;
+ const char *name;
+ struct kref kref;
+};
+
+struct gss_auth {
+ struct kref kref;
+ struct hlist_node hash;
+ struct rpc_auth rpc_auth;
+ struct gss_api_mech *mech;
+ enum rpc_gss_svc service;
+ struct rpc_clnt *client;
+ struct net *net;
+ /*
+ * 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.
+ */
+ struct gss_pipe *gss_pipe[2];
+ const char *target_name;
+};
+
+/* pipe_version >= 0 if and only if someone has a pipe open. */
+static DEFINE_SPINLOCK(pipe_version_lock);
+static struct rpc_wait_queue pipe_version_rpc_waitqueue;
+static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
+static void gss_put_auth(struct gss_auth *gss_auth);
+
+static void gss_free_ctx(struct gss_cl_ctx *);
+static const struct rpc_pipe_ops gss_upcall_ops_v0;
+static const struct rpc_pipe_ops gss_upcall_ops_v1;
+
+static inline struct gss_cl_ctx *
+gss_get_ctx(struct gss_cl_ctx *ctx)
+{
+ refcount_inc(&ctx->count);
+ return ctx;
+}
+
+static inline void
+gss_put_ctx(struct gss_cl_ctx *ctx)
+{
+ if (refcount_dec_and_test(&ctx->count))
+ gss_free_ctx(ctx);
+}
+
+/* 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
+ * and a new one is protected by the pipe->lock.
+ */
+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);
+
+ if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+ return;
+ gss_get_ctx(ctx);
+ rcu_assign_pointer(gss_cred->gc_ctx, ctx);
+ set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+ smp_mb__before_atomic();
+ clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
+}
+
+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;
+
+ rcu_read_lock();
+ ctx = rcu_dereference(gss_cred->gc_ctx);
+ if (ctx)
+ gss_get_ctx(ctx);
+ rcu_read_unlock();
+ return ctx;
+}
+
+static struct gss_cl_ctx *
+gss_alloc_context(void)
+{
+ struct gss_cl_ctx *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
+ 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);
+ refcount_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;
+ unsigned long now = jiffies;
+ u32 window_size;
+ int ret;
+
+ /* 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.
+ */
+ p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
+ if (IS_ERR(p))
+ goto err;
+ if (timeout == 0)
+ timeout = GSSD_MIN_TIMEOUT;
+ ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
+ /* Sequence number window. Determines the maximum number of
+ * simultaneous requests
+ */
+ 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) {
+ /*
+ * 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);
+ 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;
+ }
+ ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
+ if (ret < 0) {
+ trace_rpcgss_import_ctx(ret);
+ p = ERR_PTR(ret);
+ goto err;
+ }
+
+ /* is there any trailing data? */
+ if (q == end) {
+ p = q;
+ goto done;
+ }
+
+ /* pull in acceptor name (if there is one) */
+ p = simple_get_netobj(q, end, &ctx->gc_acceptor);
+ if (IS_ERR(p))
+ goto err;
+done:
+ trace_rpcgss_context(ctx->gc_expiry, now, timeout,
+ ctx->gc_acceptor.len, ctx->gc_acceptor.data);
+err:
+ return p;
+}
+
+/* XXX: Need some documentation about why UPCALL_BUF_LEN is so small.
+ * Is user space expecting no more than UPCALL_BUF_LEN bytes?
+ * Note that there are now _two_ NI_MAXHOST sized data items
+ * being passed in this string.
+ */
+#define UPCALL_BUF_LEN 256
+
+struct gss_upcall_msg {
+ refcount_t count;
+ kuid_t uid;
+ const char *service_name;
+ struct rpc_pipe_msg msg;
+ struct list_head list;
+ struct gss_auth *auth;
+ struct rpc_pipe *pipe;
+ struct rpc_wait_queue rpc_waitqueue;
+ wait_queue_head_t waitqueue;
+ struct gss_cl_ctx *ctx;
+ char databuf[UPCALL_BUF_LEN];
+};
+
+static int get_pipe_version(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ int ret;
+
+ spin_lock(&pipe_version_lock);
+ if (sn->pipe_version >= 0) {
+ atomic_inc(&sn->pipe_users);
+ ret = sn->pipe_version;
+ } else
+ ret = -EAGAIN;
+ spin_unlock(&pipe_version_lock);
+ return ret;
+}
+
+static void put_pipe_version(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+ if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
+ sn->pipe_version = -1;
+ spin_unlock(&pipe_version_lock);
+ }
+}
+
+static void
+gss_release_msg(struct gss_upcall_msg *gss_msg)
+{
+ struct net *net = gss_msg->auth->net;
+ if (!refcount_dec_and_test(&gss_msg->count))
+ return;
+ put_pipe_version(net);
+ BUG_ON(!list_empty(&gss_msg->list));
+ if (gss_msg->ctx != NULL)
+ gss_put_ctx(gss_msg->ctx);
+ rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
+ gss_put_auth(gss_msg->auth);
+ kfree_const(gss_msg->service_name);
+ kfree(gss_msg);
+}
+
+static struct gss_upcall_msg *
+__gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth)
+{
+ struct gss_upcall_msg *pos;
+ list_for_each_entry(pos, &pipe->in_downcall, list) {
+ if (!uid_eq(pos->uid, uid))
+ continue;
+ if (pos->auth->service != auth->service)
+ continue;
+ refcount_inc(&pos->count);
+ return pos;
+ }
+ return NULL;
+}
+
+/* Try to add an upcall to the pipefs queue.
+ * 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 *
+gss_add_msg(struct gss_upcall_msg *gss_msg)
+{
+ struct rpc_pipe *pipe = gss_msg->pipe;
+ struct gss_upcall_msg *old;
+
+ spin_lock(&pipe->lock);
+ old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth);
+ if (old == NULL) {
+ refcount_inc(&gss_msg->count);
+ list_add(&gss_msg->list, &pipe->in_downcall);
+ } else
+ gss_msg = old;
+ spin_unlock(&pipe->lock);
+ 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);
+ refcount_dec(&gss_msg->count);
+}
+
+static void
+gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+ struct rpc_pipe *pipe = gss_msg->pipe;
+
+ if (list_empty(&gss_msg->list))
+ return;
+ spin_lock(&pipe->lock);
+ if (!list_empty(&gss_msg->list))
+ __gss_unhash_msg(gss_msg);
+ spin_unlock(&pipe->lock);
+}
+
+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);
+}
+
+static void
+gss_upcall_callback(struct rpc_task *task)
+{
+ struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
+ struct gss_cred, gc_base);
+ struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
+ struct rpc_pipe *pipe = gss_msg->pipe;
+
+ spin_lock(&pipe->lock);
+ gss_handle_downcall_result(gss_cred, gss_msg);
+ spin_unlock(&pipe->lock);
+ task->tk_status = gss_msg->msg.errno;
+ gss_release_msg(gss_msg);
+}
+
+static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg,
+ const struct cred *cred)
+{
+ struct user_namespace *userns = cred->user_ns;
+
+ uid_t uid = from_kuid_munged(userns, gss_msg->uid);
+ memcpy(gss_msg->databuf, &uid, sizeof(uid));
+ gss_msg->msg.data = gss_msg->databuf;
+ gss_msg->msg.len = sizeof(uid);
+
+ BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
+}
+
+static ssize_t
+gss_v0_upcall(struct file *file, struct rpc_pipe_msg *msg,
+ char __user *buf, size_t buflen)
+{
+ struct gss_upcall_msg *gss_msg = container_of(msg,
+ struct gss_upcall_msg,
+ msg);
+ if (msg->copied == 0)
+ gss_encode_v0_msg(gss_msg, file->f_cred);
+ return rpc_pipe_generic_upcall(file, msg, buf, buflen);
+}
+
+static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
+ const char *service_name,
+ const char *target_name,
+ const struct cred *cred)
+{
+ struct user_namespace *userns = cred->user_ns;
+ struct gss_api_mech *mech = gss_msg->auth->mech;
+ char *p = gss_msg->databuf;
+ size_t buflen = sizeof(gss_msg->databuf);
+ int len;
+
+ len = scnprintf(p, buflen, "mech=%s uid=%d", mech->gm_name,
+ from_kuid_munged(userns, gss_msg->uid));
+ buflen -= len;
+ p += len;
+ gss_msg->msg.len = len;
+
+ /*
+ * target= is a full service principal that names the remote
+ * identity that we are authenticating to.
+ */
+ if (target_name) {
+ len = scnprintf(p, buflen, " target=%s", target_name);
+ buflen -= len;
+ p += len;
+ gss_msg->msg.len += len;
+ }
+
+ /*
+ * gssd uses service= and srchost= to select a matching key from
+ * the system's keytab to use as the source principal.
+ *
+ * service= is the service name part of the source principal,
+ * or "*" (meaning choose any).
+ *
+ * srchost= is the hostname part of the source principal. When
+ * not provided, gssd uses the local hostname.
+ */
+ if (service_name) {
+ char *c = strchr(service_name, '@');
+
+ if (!c)
+ len = scnprintf(p, buflen, " service=%s",
+ service_name);
+ else
+ len = scnprintf(p, buflen,
+ " service=%.*s srchost=%s",
+ (int)(c - service_name),
+ service_name, c + 1);
+ buflen -= len;
+ p += len;
+ gss_msg->msg.len += len;
+ }
+
+ if (mech->gm_upcall_enctypes) {
+ len = scnprintf(p, buflen, " enctypes=%s",
+ mech->gm_upcall_enctypes);
+ buflen -= len;
+ p += len;
+ gss_msg->msg.len += len;
+ }
+ trace_rpcgss_upcall_msg(gss_msg->databuf);
+ len = scnprintf(p, buflen, "\n");
+ if (len == 0)
+ goto out_overflow;
+ gss_msg->msg.len += len;
+ gss_msg->msg.data = gss_msg->databuf;
+ return 0;
+out_overflow:
+ WARN_ON_ONCE(1);
+ return -ENOMEM;
+}
+
+static ssize_t
+gss_v1_upcall(struct file *file, struct rpc_pipe_msg *msg,
+ char __user *buf, size_t buflen)
+{
+ struct gss_upcall_msg *gss_msg = container_of(msg,
+ struct gss_upcall_msg,
+ msg);
+ int err;
+ if (msg->copied == 0) {
+ err = gss_encode_v1_msg(gss_msg,
+ gss_msg->service_name,
+ gss_msg->auth->target_name,
+ file->f_cred);
+ if (err)
+ return err;
+ }
+ return rpc_pipe_generic_upcall(file, msg, buf, buflen);
+}
+
+static struct gss_upcall_msg *
+gss_alloc_msg(struct gss_auth *gss_auth,
+ kuid_t uid, const char *service_name)
+{
+ struct gss_upcall_msg *gss_msg;
+ int vers;
+ int err = -ENOMEM;
+
+ gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
+ if (gss_msg == NULL)
+ goto err;
+ vers = get_pipe_version(gss_auth->net);
+ err = vers;
+ if (err < 0)
+ goto err_free_msg;
+ gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
+ INIT_LIST_HEAD(&gss_msg->list);
+ rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
+ init_waitqueue_head(&gss_msg->waitqueue);
+ refcount_set(&gss_msg->count, 1);
+ gss_msg->uid = uid;
+ gss_msg->auth = gss_auth;
+ kref_get(&gss_auth->kref);
+ if (service_name) {
+ gss_msg->service_name = kstrdup_const(service_name, GFP_NOFS);
+ if (!gss_msg->service_name) {
+ err = -ENOMEM;
+ goto err_put_pipe_version;
+ }
+ }
+ return gss_msg;
+err_put_pipe_version:
+ put_pipe_version(gss_auth->net);
+err_free_msg:
+ kfree(gss_msg);
+err:
+ return ERR_PTR(err);
+}
+
+static struct gss_upcall_msg *
+gss_setup_upcall(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;
+ kuid_t uid = cred->cr_cred->fsuid;
+
+ gss_new = gss_alloc_msg(gss_auth, 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;
+ refcount_inc(&gss_msg->count);
+ res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
+ if (res) {
+ gss_unhash_msg(gss_new);
+ refcount_dec(&gss_msg->count);
+ gss_release_msg(gss_new);
+ gss_msg = ERR_PTR(res);
+ }
+ } else
+ gss_release_msg(gss_new);
+ return gss_msg;
+}
+
+static void warn_gssd(void)
+{
+ dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
+}
+
+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;
+
+ gss_msg = gss_setup_upcall(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();
+ rpc_sleep_on_timeout(&pipe_version_rpc_waitqueue,
+ task, NULL, jiffies + (15 * HZ));
+ err = -EAGAIN;
+ goto out;
+ }
+ 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) {
+ gss_cred->gc_upcall = gss_msg;
+ /* gss_upcall_callback will release the reference to gss_upcall_msg */
+ refcount_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:
+ trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
+ cred->cr_cred->fsuid), err);
+ return err;
+}
+
+static inline int
+gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
+{
+ struct net *net = gss_auth->net;
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct rpc_pipe *pipe;
+ struct rpc_cred *cred = &gss_cred->gc_base;
+ struct gss_upcall_msg *gss_msg;
+ DEFINE_WAIT(wait);
+ int err;
+
+retry:
+ err = 0;
+ /* if gssd is down, just skip upcalling altogether */
+ if (!gssd_running(net)) {
+ warn_gssd();
+ err = -EACCES;
+ goto out;
+ }
+ gss_msg = gss_setup_upcall(gss_auth, cred);
+ if (PTR_ERR(gss_msg) == -EAGAIN) {
+ err = wait_event_interruptible_timeout(pipe_version_waitqueue,
+ sn->pipe_version >= 0, 15 * HZ);
+ if (sn->pipe_version < 0) {
+ warn_gssd();
+ err = -EACCES;
+ }
+ if (err < 0)
+ 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:
+ trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
+ cred->cr_cred->fsuid), err);
+ return err;
+}
+
+static struct gss_upcall_msg *
+gss_find_downcall(struct rpc_pipe *pipe, kuid_t uid)
+{
+ struct gss_upcall_msg *pos;
+ list_for_each_entry(pos, &pipe->in_downcall, list) {
+ if (!uid_eq(pos->uid, uid))
+ continue;
+ if (!rpc_msg_is_inflight(&pos->msg))
+ continue;
+ refcount_inc(&pos->count);
+ return pos;
+ }
+ return NULL;
+}
+
+#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(file_inode(filp))->pipe;
+ struct gss_cl_ctx *ctx;
+ uid_t id;
+ kuid_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, &id, sizeof(id));
+ if (IS_ERR(p)) {
+ err = PTR_ERR(p);
+ goto err;
+ }
+
+ uid = make_kuid(current_user_ns(), id);
+ if (!uid_valid(uid)) {
+ err = -EINVAL;
+ 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_downcall(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);
+ gss_msg->msg.errno = -EIO;
+ }
+ 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:
+ return err;
+}
+
+static int gss_pipe_open(struct inode *inode, int new_version)
+{
+ struct net *net = inode->i_sb->s_fs_info;
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ int ret = 0;
+
+ spin_lock(&pipe_version_lock);
+ if (sn->pipe_version < 0) {
+ /* First open of any gss pipe determines the version: */
+ sn->pipe_version = new_version;
+ rpc_wake_up(&pipe_version_rpc_waitqueue);
+ wake_up(&pipe_version_waitqueue);
+ } else if (sn->pipe_version != new_version) {
+ /* Trying to open a pipe of a different version */
+ ret = -EBUSY;
+ goto out;
+ }
+ atomic_inc(&sn->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 net *net = inode->i_sb->s_fs_info;
+ 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;
+ refcount_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(net);
+}
+
+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) {
+ refcount_inc(&gss_msg->count);
+ gss_unhash_msg(gss_msg);
+ if (msg->errno == -ETIMEDOUT)
+ warn_gssd();
+ gss_release_msg(gss_msg);
+ }
+ gss_release_msg(gss_msg);
+}
+
+static void gss_pipe_dentry_destroy(struct dentry *dir,
+ struct rpc_pipe_dir_object *pdo)
+{
+ struct gss_pipe *gss_pipe = pdo->pdo_data;
+ struct rpc_pipe *pipe = gss_pipe->pipe;
+
+ if (pipe->dentry != NULL) {
+ rpc_unlink(pipe->dentry);
+ pipe->dentry = NULL;
+ }
+}
+
+static int gss_pipe_dentry_create(struct dentry *dir,
+ struct rpc_pipe_dir_object *pdo)
+{
+ struct gss_pipe *p = pdo->pdo_data;
+ struct dentry *dentry;
+
+ dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ p->pipe->dentry = dentry;
+ return 0;
+}
+
+static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
+ .create = gss_pipe_dentry_create,
+ .destroy = gss_pipe_dentry_destroy,
+};
+
+static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
+ const char *name,
+ const struct rpc_pipe_ops *upcall_ops)
+{
+ struct gss_pipe *p;
+ int err = -ENOMEM;
+
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (p == NULL)
+ goto err;
+ p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
+ if (IS_ERR(p->pipe)) {
+ err = PTR_ERR(p->pipe);
+ goto err_free_gss_pipe;
+ }
+ p->name = name;
+ p->clnt = clnt;
+ kref_init(&p->kref);
+ rpc_init_pipe_dir_object(&p->pdo,
+ &gss_pipe_dir_object_ops,
+ p);
+ return p;
+err_free_gss_pipe:
+ kfree(p);
+err:
+ return ERR_PTR(err);
+}
+
+struct gss_alloc_pdo {
+ struct rpc_clnt *clnt;
+ const char *name;
+ const struct rpc_pipe_ops *upcall_ops;
+};
+
+static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
+{
+ struct gss_pipe *gss_pipe;
+ struct gss_alloc_pdo *args = data;
+
+ if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
+ return 0;
+ gss_pipe = container_of(pdo, struct gss_pipe, pdo);
+ if (strcmp(gss_pipe->name, args->name) != 0)
+ return 0;
+ if (!kref_get_unless_zero(&gss_pipe->kref))
+ return 0;
+ return 1;
+}
+
+static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
+{
+ struct gss_pipe *gss_pipe;
+ struct gss_alloc_pdo *args = data;
+
+ gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
+ if (!IS_ERR(gss_pipe))
+ return &gss_pipe->pdo;
+ return NULL;
+}
+
+static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
+ const char *name,
+ const struct rpc_pipe_ops *upcall_ops)
+{
+ struct net *net = rpc_net_ns(clnt);
+ struct rpc_pipe_dir_object *pdo;
+ struct gss_alloc_pdo args = {
+ .clnt = clnt,
+ .name = name,
+ .upcall_ops = upcall_ops,
+ };
+
+ pdo = rpc_find_or_alloc_pipe_dir_object(net,
+ &clnt->cl_pipedir_objects,
+ gss_pipe_match_pdo,
+ gss_pipe_alloc_pdo,
+ &args);
+ if (pdo != NULL)
+ return container_of(pdo, struct gss_pipe, pdo);
+ return ERR_PTR(-ENOMEM);
+}
+
+static void __gss_pipe_free(struct gss_pipe *p)
+{
+ struct rpc_clnt *clnt = p->clnt;
+ struct net *net = rpc_net_ns(clnt);
+
+ rpc_remove_pipe_dir_object(net,
+ &clnt->cl_pipedir_objects,
+ &p->pdo);
+ rpc_destroy_pipe_data(p->pipe);
+ kfree(p);
+}
+
+static void __gss_pipe_release(struct kref *kref)
+{
+ struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
+
+ __gss_pipe_free(p);
+}
+
+static void gss_pipe_free(struct gss_pipe *p)
+{
+ if (p != NULL)
+ kref_put(&p->kref, __gss_pipe_release);
+}
+
+/*
+ * NOTE: we have the opportunity to use different
+ * parameters based on the input flavor (which must be a pseudoflavor)
+ */
+static struct gss_auth *
+gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+ rpc_authflavor_t flavor = args->pseudoflavor;
+ struct gss_auth *gss_auth;
+ struct gss_pipe *gss_pipe;
+ struct rpc_auth * auth;
+ int err = -ENOMEM; /* XXX? */
+
+ if (!try_module_get(THIS_MODULE))
+ return ERR_PTR(err);
+ if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
+ goto out_dec;
+ INIT_HLIST_NODE(&gss_auth->hash);
+ gss_auth->target_name = NULL;
+ if (args->target_name) {
+ gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
+ if (gss_auth->target_name == NULL)
+ goto err_free;
+ }
+ gss_auth->client = clnt;
+ gss_auth->net = get_net(rpc_net_ns(clnt));
+ err = -EINVAL;
+ gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
+ if (!gss_auth->mech)
+ goto err_put_net;
+ gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
+ if (gss_auth->service == 0)
+ goto err_put_mech;
+ if (!gssd_running(gss_auth->net))
+ goto err_put_mech;
+ auth = &gss_auth->rpc_auth;
+ auth->au_cslack = GSS_CRED_SLACK >> 2;
+ auth->au_rslack = GSS_KRB5_MAX_SLACK_NEEDED >> 2;
+ auth->au_verfsize = GSS_VERF_SLACK >> 2;
+ auth->au_ralign = GSS_VERF_SLACK >> 2;
+ auth->au_flags = 0;
+ auth->au_ops = &authgss_ops;
+ auth->au_flavor = flavor;
+ if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor))
+ auth->au_flags |= RPCAUTH_AUTH_DATATOUCH;
+ refcount_set(&auth->au_count, 1);
+ kref_init(&gss_auth->kref);
+
+ err = rpcauth_init_credcache(auth);
+ if (err)
+ goto err_put_mech;
+ /*
+ * 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_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
+ if (IS_ERR(gss_pipe)) {
+ err = PTR_ERR(gss_pipe);
+ goto err_destroy_credcache;
+ }
+ gss_auth->gss_pipe[1] = gss_pipe;
+
+ gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
+ &gss_upcall_ops_v0);
+ if (IS_ERR(gss_pipe)) {
+ err = PTR_ERR(gss_pipe);
+ goto err_destroy_pipe_1;
+ }
+ gss_auth->gss_pipe[0] = gss_pipe;
+
+ return gss_auth;
+err_destroy_pipe_1:
+ gss_pipe_free(gss_auth->gss_pipe[1]);
+err_destroy_credcache:
+ rpcauth_destroy_credcache(auth);
+err_put_mech:
+ gss_mech_put(gss_auth->mech);
+err_put_net:
+ put_net(gss_auth->net);
+err_free:
+ kfree(gss_auth->target_name);
+ kfree(gss_auth);
+out_dec:
+ module_put(THIS_MODULE);
+ trace_rpcgss_createauth(flavor, err);
+ return ERR_PTR(err);
+}
+
+static void
+gss_free(struct gss_auth *gss_auth)
+{
+ gss_pipe_free(gss_auth->gss_pipe[0]);
+ gss_pipe_free(gss_auth->gss_pipe[1]);
+ gss_mech_put(gss_auth->mech);
+ put_net(gss_auth->net);
+ kfree(gss_auth->target_name);
+
+ 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_put_auth(struct gss_auth *gss_auth)
+{
+ kref_put(&gss_auth->kref, gss_free_callback);
+}
+
+static void
+gss_destroy(struct rpc_auth *auth)
+{
+ struct gss_auth *gss_auth = container_of(auth,
+ struct gss_auth, rpc_auth);
+
+ if (hash_hashed(&gss_auth->hash)) {
+ spin_lock(&gss_auth_hash_lock);
+ hash_del(&gss_auth->hash);
+ spin_unlock(&gss_auth_hash_lock);
+ }
+
+ gss_pipe_free(gss_auth->gss_pipe[0]);
+ gss_auth->gss_pipe[0] = NULL;
+ gss_pipe_free(gss_auth->gss_pipe[1]);
+ gss_auth->gss_pipe[1] = NULL;
+ rpcauth_destroy_credcache(auth);
+
+ gss_put_auth(gss_auth);
+}
+
+/*
+ * Auths may be shared between rpc clients that were cloned from a
+ * common client with the same xprt, if they also share the flavor and
+ * target_name.
+ *
+ * The auth is looked up from the oldest parent sharing the same
+ * cl_xprt, and the auth itself references only that common parent
+ * (which is guaranteed to last as long as any of its descendants).
+ */
+static struct gss_auth *
+gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args,
+ struct rpc_clnt *clnt,
+ struct gss_auth *new)
+{
+ struct gss_auth *gss_auth;
+ unsigned long hashval = (unsigned long)clnt;
+
+ spin_lock(&gss_auth_hash_lock);
+ hash_for_each_possible(gss_auth_hash_table,
+ gss_auth,
+ hash,
+ hashval) {
+ if (gss_auth->client != clnt)
+ continue;
+ if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
+ continue;
+ if (gss_auth->target_name != args->target_name) {
+ if (gss_auth->target_name == NULL)
+ continue;
+ if (args->target_name == NULL)
+ continue;
+ if (strcmp(gss_auth->target_name, args->target_name))
+ continue;
+ }
+ if (!refcount_inc_not_zero(&gss_auth->rpc_auth.au_count))
+ continue;
+ goto out;
+ }
+ if (new)
+ hash_add(gss_auth_hash_table, &new->hash, hashval);
+ gss_auth = new;
+out:
+ spin_unlock(&gss_auth_hash_lock);
+ return gss_auth;
+}
+
+static struct gss_auth *
+gss_create_hashed(const struct rpc_auth_create_args *args,
+ struct rpc_clnt *clnt)
+{
+ struct gss_auth *gss_auth;
+ struct gss_auth *new;
+
+ gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
+ if (gss_auth != NULL)
+ goto out;
+ new = gss_create_new(args, clnt);
+ if (IS_ERR(new))
+ return new;
+ gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
+ if (gss_auth != new)
+ gss_destroy(&new->rpc_auth);
+out:
+ return gss_auth;
+}
+
+static struct rpc_auth *
+gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+ struct gss_auth *gss_auth;
+ struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
+
+ while (clnt != clnt->cl_parent) {
+ struct rpc_clnt *parent = clnt->cl_parent;
+ /* Find the original parent for this transport */
+ if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
+ break;
+ clnt = parent;
+ }
+
+ gss_auth = gss_create_hashed(args, clnt);
+ if (IS_ERR(gss_auth))
+ return ERR_CAST(gss_auth);
+ return &gss_auth->rpc_auth;
+}
+
+static struct gss_cred *
+gss_dup_cred(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
+{
+ struct gss_cred *new;
+
+ /* Make a copy of the cred so that we can reference count it */
+ new = kzalloc(sizeof(*gss_cred), GFP_NOFS);
+ if (new) {
+ struct auth_cred acred = {
+ .cred = gss_cred->gc_base.cr_cred,
+ };
+ struct gss_cl_ctx *ctx =
+ rcu_dereference_protected(gss_cred->gc_ctx, 1);
+
+ rpcauth_init_cred(&new->gc_base, &acred,
+ &gss_auth->rpc_auth,
+ &gss_nullops);
+ new->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
+ new->gc_service = gss_cred->gc_service;
+ new->gc_principal = gss_cred->gc_principal;
+ kref_get(&gss_auth->kref);
+ rcu_assign_pointer(new->gc_ctx, ctx);
+ gss_get_ctx(ctx);
+ }
+ return new;
+}
+
+/*
+ * gss_send_destroy_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 void
+gss_send_destroy_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 gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
+ struct gss_cred *new;
+ struct rpc_task *task;
+
+ new = gss_dup_cred(gss_auth, gss_cred);
+ if (new) {
+ ctx->gc_proc = RPC_GSS_PROC_DESTROY;
+
+ task = rpc_call_null(gss_auth->client, &new->gc_base,
+ RPC_TASK_ASYNC|RPC_TASK_SOFT);
+ if (!IS_ERR(task))
+ rpc_put_task(task);
+
+ put_rpccred(&new->gc_base);
+ }
+}
+
+/* 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)
+{
+ gss_delete_sec_context(&ctx->gc_gss_ctx);
+ kfree(ctx->gc_wire_ctx.data);
+ kfree(ctx->gc_acceptor.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)
+{
+ 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 = rcu_dereference_protected(gss_cred->gc_ctx, 1);
+
+ RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
+ put_cred(cred->cr_cred);
+ call_rcu(&cred->cr_rcu, gss_free_cred_callback);
+ if (ctx)
+ gss_put_ctx(ctx);
+ gss_put_auth(gss_auth);
+}
+
+static void
+gss_destroy_cred(struct rpc_cred *cred)
+{
+
+ if (test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0)
+ gss_send_destroy_context(cred);
+ gss_destroy_nullcred(cred);
+}
+
+static int
+gss_hash_cred(struct auth_cred *acred, unsigned int hashbits)
+{
+ return hash_64(from_kuid(&init_user_ns, acred->cred->fsuid), hashbits);
+}
+
+/*
+ * 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, GFP_NOFS);
+}
+
+static struct rpc_cred *
+gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
+{
+ struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
+ struct gss_cred *cred = NULL;
+ int err = -ENOMEM;
+
+ if (!(cred = kzalloc(sizeof(*cred), gfp)))
+ 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 = acred->principal;
+ kref_get(&gss_auth->kref);
+ return &cred->gc_base;
+
+out_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 char *
+gss_stringify_acceptor(struct rpc_cred *cred)
+{
+ char *string = NULL;
+ struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+ struct gss_cl_ctx *ctx;
+ unsigned int len;
+ struct xdr_netobj *acceptor;
+
+ rcu_read_lock();
+ ctx = rcu_dereference(gss_cred->gc_ctx);
+ if (!ctx)
+ goto out;
+
+ len = ctx->gc_acceptor.len;
+ rcu_read_unlock();
+
+ /* no point if there's no string */
+ if (!len)
+ return NULL;
+realloc:
+ string = kmalloc(len + 1, GFP_KERNEL);
+ if (!string)
+ return NULL;
+
+ rcu_read_lock();
+ ctx = rcu_dereference(gss_cred->gc_ctx);
+
+ /* did the ctx disappear or was it replaced by one with no acceptor? */
+ if (!ctx || !ctx->gc_acceptor.len) {
+ kfree(string);
+ string = NULL;
+ goto out;
+ }
+
+ acceptor = &ctx->gc_acceptor;
+
+ /*
+ * Did we find a new acceptor that's longer than the original? Allocate
+ * a longer buffer and try again.
+ */
+ if (len < acceptor->len) {
+ len = acceptor->len;
+ rcu_read_unlock();
+ kfree(string);
+ goto realloc;
+ }
+
+ memcpy(string, acceptor->data, acceptor->len);
+ string[acceptor->len] = '\0';
+out:
+ rcu_read_unlock();
+ return string;
+}
+
+/*
+ * Returns -EACCES if GSS context is NULL or will expire within the
+ * timeout (miliseconds)
+ */
+static int
+gss_key_timeout(struct rpc_cred *rc)
+{
+ struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
+ struct gss_cl_ctx *ctx;
+ unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
+ int ret = 0;
+
+ rcu_read_lock();
+ ctx = rcu_dereference(gss_cred->gc_ctx);
+ if (!ctx || time_after(timeout, ctx->gc_expiry))
+ ret = -EACCES;
+ rcu_read_unlock();
+
+ return ret;
+}
+
+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);
+ struct gss_cl_ctx *ctx;
+ int ret;
+
+ if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
+ goto out;
+ /* Don't match with creds that have expired. */
+ rcu_read_lock();
+ ctx = rcu_dereference(gss_cred->gc_ctx);
+ if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
+ rcu_read_unlock();
+ return 0;
+ }
+ rcu_read_unlock();
+ if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
+ return 0;
+out:
+ if (acred->principal != NULL) {
+ if (gss_cred->gc_principal == NULL)
+ return 0;
+ ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
+ } else {
+ if (gss_cred->gc_principal != NULL)
+ return 0;
+ ret = uid_eq(rc->cr_cred->fsuid, acred->cred->fsuid);
+ }
+ return ret;
+}
+
+/*
+ * Marshal credentials.
+ *
+ * The expensive part is computing the verifier. We can't cache a
+ * pre-computed version of the verifier because the seqno, which
+ * is different every time, is included in the MIC.
+ */
+static int gss_marshal(struct rpc_task *task, struct xdr_stream *xdr)
+{
+ 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 *p, *cred_len;
+ u32 maj_stat = 0;
+ struct xdr_netobj mic;
+ struct kvec iov;
+ struct xdr_buf verf_buf;
+ int status;
+
+ /* Credential */
+
+ p = xdr_reserve_space(xdr, 7 * sizeof(*p) +
+ ctx->gc_wire_ctx.len);
+ if (!p)
+ goto marshal_failed;
+ *p++ = rpc_auth_gss;
+ cred_len = p++;
+
+ spin_lock(&ctx->gc_seq_lock);
+ req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ;
+ spin_unlock(&ctx->gc_seq_lock);
+ if (req->rq_seqno == MAXSEQ)
+ goto expired;
+ trace_rpcgss_seqno(task);
+
+ *p++ = cpu_to_be32(RPC_GSS_VERSION);
+ *p++ = cpu_to_be32(ctx->gc_proc);
+ *p++ = cpu_to_be32(req->rq_seqno);
+ *p++ = cpu_to_be32(gss_cred->gc_service);
+ p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
+ *cred_len = cpu_to_be32((p - (cred_len + 1)) << 2);
+
+ /* Verifier */
+
+ /* We compute the checksum for the verifier over the xdr-encoded bytes
+ * starting with the xid and ending at the end of the credential: */
+ iov.iov_base = req->rq_snd_buf.head[0].iov_base;
+ iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
+ xdr_buf_from_iov(&iov, &verf_buf);
+
+ p = xdr_reserve_space(xdr, sizeof(*p));
+ if (!p)
+ goto marshal_failed;
+ *p++ = 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)
+ goto expired;
+ else if (maj_stat != 0)
+ goto bad_mic;
+ if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
+ goto marshal_failed;
+ status = 0;
+out:
+ gss_put_ctx(ctx);
+ return status;
+expired:
+ clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+ status = -EKEYEXPIRED;
+ goto out;
+marshal_failed:
+ status = -EMSGSIZE;
+ goto out;
+bad_mic:
+ trace_rpcgss_get_mic(task, maj_stat);
+ status = -EIO;
+ goto out;
+}
+
+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 = {
+ .cred = oldcred->cr_cred,
+ .principal = gss_cred->gc_principal,
+ };
+ 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 0;
+}
+
+static int
+gss_validate(struct rpc_task *task, struct xdr_stream *xdr)
+{
+ struct rpc_cred *cred = task->tk_rqstp->rq_cred;
+ struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+ __be32 *p, *seq = NULL;
+ struct kvec iov;
+ struct xdr_buf verf_buf;
+ struct xdr_netobj mic;
+ u32 len, maj_stat;
+ int status;
+
+ p = xdr_inline_decode(xdr, 2 * sizeof(*p));
+ if (!p)
+ goto validate_failed;
+ if (*p++ != rpc_auth_gss)
+ goto validate_failed;
+ len = be32_to_cpup(p);
+ if (len > RPC_MAX_AUTH_SIZE)
+ goto validate_failed;
+ p = xdr_inline_decode(xdr, len);
+ if (!p)
+ goto validate_failed;
+
+ seq = kmalloc(4, GFP_NOFS);
+ if (!seq)
+ goto validate_failed;
+ *seq = cpu_to_be32(task->tk_rqstp->rq_seqno);
+ iov.iov_base = seq;
+ iov.iov_len = 4;
+ 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)
+ goto bad_mic;
+
+ /* 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;
+ status = 0;
+out:
+ gss_put_ctx(ctx);
+ kfree(seq);
+ return status;
+
+validate_failed:
+ status = -EIO;
+ goto out;
+bad_mic:
+ trace_rpcgss_verify_mic(task, maj_stat);
+ status = -EACCES;
+ goto out;
+}
+
+static int gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+ struct rpc_task *task, struct xdr_stream *xdr)
+{
+ struct rpc_rqst *rqstp = task->tk_rqstp;
+ struct xdr_buf integ_buf, *snd_buf = &rqstp->rq_snd_buf;
+ struct xdr_netobj mic;
+ __be32 *p, *integ_len;
+ u32 offset, maj_stat;
+
+ p = xdr_reserve_space(xdr, 2 * sizeof(*p));
+ if (!p)
+ goto wrap_failed;
+ integ_len = p++;
+ *p = cpu_to_be32(rqstp->rq_seqno);
+
+ if (rpcauth_wrap_req_encode(task, xdr))
+ goto wrap_failed;
+
+ offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+ if (xdr_buf_subsegment(snd_buf, &integ_buf,
+ offset, snd_buf->len - offset))
+ goto wrap_failed;
+ *integ_len = cpu_to_be32(integ_buf.len);
+
+ p = xdr_reserve_space(xdr, 0);
+ if (!p)
+ goto wrap_failed;
+ mic.data = (u8 *)(p + 1);
+ maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
+ if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+ clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+ else if (maj_stat)
+ goto bad_mic;
+ /* Check that the trailing MIC fit in the buffer, after the fact */
+ if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
+ goto wrap_failed;
+ return 0;
+wrap_failed:
+ return -EMSGSIZE;
+bad_mic:
+ trace_rpcgss_get_mic(task, maj_stat);
+ return -EIO;
+}
+
+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);
+ rqstp->rq_release_snd_buf = NULL;
+}
+
+static int
+alloc_enc_pages(struct rpc_rqst *rqstp)
+{
+ struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
+ int first, last, i;
+
+ if (rqstp->rq_release_snd_buf)
+ rqstp->rq_release_snd_buf(rqstp);
+
+ if (snd_buf->page_len == 0) {
+ rqstp->rq_enc_pages_num = 0;
+ return 0;
+ }
+
+ first = snd_buf->page_base >> PAGE_SHIFT;
+ last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
+ rqstp->rq_enc_pages_num = last - first + 1 + 1;
+ rqstp->rq_enc_pages
+ = kmalloc_array(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 int gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+ struct rpc_task *task, struct xdr_stream *xdr)
+{
+ struct rpc_rqst *rqstp = task->tk_rqstp;
+ struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
+ u32 pad, offset, maj_stat;
+ int status;
+ __be32 *p, *opaque_len;
+ struct page **inpages;
+ int first;
+ struct kvec *iov;
+
+ status = -EIO;
+ p = xdr_reserve_space(xdr, 2 * sizeof(*p));
+ if (!p)
+ goto wrap_failed;
+ opaque_len = p++;
+ *p = cpu_to_be32(rqstp->rq_seqno);
+
+ if (rpcauth_wrap_req_encode(task, xdr))
+ goto wrap_failed;
+
+ status = alloc_enc_pages(rqstp);
+ if (unlikely(status))
+ goto wrap_failed;
+ first = snd_buf->page_base >> PAGE_SHIFT;
+ inpages = snd_buf->pages + first;
+ snd_buf->pages = rqstp->rq_enc_pages;
+ snd_buf->page_base -= first << PAGE_SHIFT;
+ /*
+ * Move the tail into its own page, in case gss_wrap needs
+ * more space in the head when wrapping.
+ *
+ * Still... Why can't gss_wrap just slide the tail down?
+ */
+ if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
+ char *tmp;
+
+ 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;
+ }
+ offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+ maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
+ /* slack space should prevent this ever happening: */
+ if (unlikely(snd_buf->len > snd_buf->buflen)) {
+ status = -EIO;
+ goto wrap_failed;
+ }
+ /* 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)
+ goto bad_wrap;
+
+ *opaque_len = cpu_to_be32(snd_buf->len - offset);
+ /* guess whether the pad goes into 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;
+wrap_failed:
+ return status;
+bad_wrap:
+ trace_rpcgss_wrap(task, maj_stat);
+ return -EIO;
+}
+
+static int gss_wrap_req(struct rpc_task *task, struct xdr_stream *xdr)
+{
+ 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;
+
+ status = -EIO;
+ if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
+ /* The spec seems a little ambiguous here, but I think that not
+ * wrapping context destruction requests makes the most sense.
+ */
+ status = rpcauth_wrap_req_encode(task, xdr);
+ goto out;
+ }
+ switch (gss_cred->gc_service) {
+ case RPC_GSS_SVC_NONE:
+ status = rpcauth_wrap_req_encode(task, xdr);
+ break;
+ case RPC_GSS_SVC_INTEGRITY:
+ status = gss_wrap_req_integ(cred, ctx, task, xdr);
+ break;
+ case RPC_GSS_SVC_PRIVACY:
+ status = gss_wrap_req_priv(cred, ctx, task, xdr);
+ break;
+ default:
+ status = -EIO;
+ }
+out:
+ gss_put_ctx(ctx);
+ return status;
+}
+
+static int
+gss_unwrap_resp_auth(struct rpc_cred *cred)
+{
+ struct rpc_auth *auth = cred->cr_auth;
+
+ auth->au_rslack = auth->au_verfsize;
+ auth->au_ralign = auth->au_verfsize;
+ return 0;
+}
+
+/*
+ * RFC 2203, Section 5.3.2.2
+ *
+ * struct rpc_gss_integ_data {
+ * opaque databody_integ<>;
+ * opaque checksum<>;
+ * };
+ *
+ * struct rpc_gss_data_t {
+ * unsigned int seq_num;
+ * proc_req_arg_t arg;
+ * };
+ */
+static int
+gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred,
+ struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr)
+{
+ struct xdr_buf gss_data, *rcv_buf = &rqstp->rq_rcv_buf;
+ struct rpc_auth *auth = cred->cr_auth;
+ u32 len, offset, seqno, maj_stat;
+ struct xdr_netobj mic;
+ int ret;
+
+ ret = -EIO;
+ mic.data = NULL;
+
+ /* opaque databody_integ<>; */
+ if (xdr_stream_decode_u32(xdr, &len))
+ goto unwrap_failed;
+ if (len & 3)
+ goto unwrap_failed;
+ offset = rcv_buf->len - xdr_stream_remaining(xdr);
+ if (xdr_stream_decode_u32(xdr, &seqno))
+ goto unwrap_failed;
+ if (seqno != rqstp->rq_seqno)
+ goto bad_seqno;
+ if (xdr_buf_subsegment(rcv_buf, &gss_data, offset, len))
+ goto unwrap_failed;
+
+ /*
+ * The xdr_stream now points to the beginning of the
+ * upper layer payload, to be passed below to
+ * rpcauth_unwrap_resp_decode(). The checksum, which
+ * follows the upper layer payload in @rcv_buf, is
+ * located and parsed without updating the xdr_stream.
+ */
+
+ /* opaque checksum<>; */
+ offset += len;
+ if (xdr_decode_word(rcv_buf, offset, &len))
+ goto unwrap_failed;
+ offset += sizeof(__be32);
+ if (offset + len > rcv_buf->len)
+ goto unwrap_failed;
+ mic.len = len;
+ mic.data = kmalloc(len, GFP_NOFS);
+ if (!mic.data)
+ goto unwrap_failed;
+ if (read_bytes_from_xdr_buf(rcv_buf, offset, mic.data, mic.len))
+ goto unwrap_failed;
+
+ maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &gss_data, &mic);
+ if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+ clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+ if (maj_stat != GSS_S_COMPLETE)
+ goto bad_mic;
+
+ auth->au_rslack = auth->au_verfsize + 2 + 1 + XDR_QUADLEN(mic.len);
+ auth->au_ralign = auth->au_verfsize + 2;
+ ret = 0;
+
+out:
+ kfree(mic.data);
+ return ret;
+
+unwrap_failed:
+ trace_rpcgss_unwrap_failed(task);
+ goto out;
+bad_seqno:
+ trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, seqno);
+ goto out;
+bad_mic:
+ trace_rpcgss_verify_mic(task, maj_stat);
+ goto out;
+}
+
+static int
+gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred,
+ struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
+ struct xdr_stream *xdr)
+{
+ struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
+ struct kvec *head = rqstp->rq_rcv_buf.head;
+ struct rpc_auth *auth = cred->cr_auth;
+ u32 offset, opaque_len, maj_stat;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 2 * sizeof(*p));
+ if (unlikely(!p))
+ goto unwrap_failed;
+ opaque_len = be32_to_cpup(p++);
+ offset = (u8 *)(p) - (u8 *)head->iov_base;
+ if (offset + opaque_len > rcv_buf->len)
+ goto unwrap_failed;
+
+ maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset,
+ offset + opaque_len, rcv_buf);
+ if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+ clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
+ if (maj_stat != GSS_S_COMPLETE)
+ goto bad_unwrap;
+ /* gss_unwrap decrypted the sequence number */
+ if (be32_to_cpup(p++) != rqstp->rq_seqno)
+ goto bad_seqno;
+
+ /* gss_unwrap redacts the opaque blob from the head iovec.
+ * rcv_buf has changed, thus the stream needs to be reset.
+ */
+ xdr_init_decode(xdr, rcv_buf, p, rqstp);
+
+ auth->au_rslack = auth->au_verfsize + 2 + ctx->gc_gss_ctx->slack;
+ auth->au_ralign = auth->au_verfsize + 2 + ctx->gc_gss_ctx->align;
+
+ return 0;
+unwrap_failed:
+ trace_rpcgss_unwrap_failed(task);
+ return -EIO;
+bad_seqno:
+ trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, be32_to_cpup(--p));
+ return -EIO;
+bad_unwrap:
+ trace_rpcgss_unwrap(task, maj_stat);
+ return -EIO;
+}
+
+static bool
+gss_seq_is_newer(u32 new, u32 old)
+{
+ return (s32)(new - old) > 0;
+}
+
+static bool
+gss_xmit_need_reencode(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_cred *cred = req->rq_cred;
+ struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+ u32 win, seq_xmit = 0;
+ bool ret = true;
+
+ if (!ctx)
+ goto out;
+
+ if (gss_seq_is_newer(req->rq_seqno, READ_ONCE(ctx->gc_seq)))
+ goto out_ctx;
+
+ seq_xmit = READ_ONCE(ctx->gc_seq_xmit);
+ while (gss_seq_is_newer(req->rq_seqno, seq_xmit)) {
+ u32 tmp = seq_xmit;
+
+ seq_xmit = cmpxchg(&ctx->gc_seq_xmit, tmp, req->rq_seqno);
+ if (seq_xmit == tmp) {
+ ret = false;
+ goto out_ctx;
+ }
+ }
+
+ win = ctx->gc_win;
+ if (win > 0)
+ ret = !gss_seq_is_newer(req->rq_seqno, seq_xmit - win);
+
+out_ctx:
+ gss_put_ctx(ctx);
+out:
+ trace_rpcgss_need_reencode(task, seq_xmit, ret);
+ return ret;
+}
+
+static int
+gss_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr)
+{
+ struct rpc_rqst *rqstp = task->tk_rqstp;
+ struct rpc_cred *cred = 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;
+
+ if (ctx->gc_proc != RPC_GSS_PROC_DATA)
+ goto out_decode;
+ switch (gss_cred->gc_service) {
+ case RPC_GSS_SVC_NONE:
+ status = gss_unwrap_resp_auth(cred);
+ break;
+ case RPC_GSS_SVC_INTEGRITY:
+ status = gss_unwrap_resp_integ(task, cred, ctx, rqstp, xdr);
+ break;
+ case RPC_GSS_SVC_PRIVACY:
+ status = gss_unwrap_resp_priv(task, cred, ctx, rqstp, xdr);
+ break;
+ }
+ if (status)
+ goto out;
+
+out_decode:
+ status = rpcauth_unwrap_resp_decode(task, xdr);
+out:
+ gss_put_ctx(ctx);
+ 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,
+ .hash_cred = gss_hash_cred,
+ .lookup_cred = gss_lookup_cred,
+ .crcreate = gss_create_cred,
+ .list_pseudoflavors = gss_mech_list_pseudoflavors,
+ .info2flavor = gss_mech_info2flavor,
+ .flavor2info = gss_mech_flavor2info,
+};
+
+static const struct rpc_credops gss_credops = {
+ .cr_name = "AUTH_GSS",
+ .crdestroy = gss_destroy_cred,
+ .cr_init = gss_cred_init,
+ .crmatch = gss_match,
+ .crmarshal = gss_marshal,
+ .crrefresh = gss_refresh,
+ .crvalidate = gss_validate,
+ .crwrap_req = gss_wrap_req,
+ .crunwrap_resp = gss_unwrap_resp,
+ .crkey_timeout = gss_key_timeout,
+ .crstringify_acceptor = gss_stringify_acceptor,
+ .crneed_reencode = gss_xmit_need_reencode,
+};
+
+static const struct rpc_credops gss_nullops = {
+ .cr_name = "AUTH_GSS",
+ .crdestroy = gss_destroy_nullcred,
+ .crmatch = gss_match,
+ .crmarshal = gss_marshal,
+ .crrefresh = gss_refresh_null,
+ .crvalidate = gss_validate,
+ .crwrap_req = gss_wrap_req,
+ .crunwrap_resp = gss_unwrap_resp,
+ .crstringify_acceptor = gss_stringify_acceptor,
+};
+
+static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
+ .upcall = gss_v0_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 = gss_v1_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_ALIAS("rpc-auth-6");
+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_param_named(key_expire_timeo,
+ gss_key_expire_timeo,
+ uint, 0644);
+MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
+ "credential keys lifetime where the NFS layer cleans up "
+ "prior to key expiration");
+
+module_init(init_rpcsec_gss)
+module_exit(exit_rpcsec_gss)