static const struct rpc_authops authgss_ops;
static const struct rpc_credops gss_credops;
+static const struct rpc_credops gss_nullops;
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#define isprint(c) ((c > 0x1f) && (c < 0x7f))
struct gss_auth {
+ struct kref kref;
struct rpc_auth rpc_auth;
struct gss_api_mech *mech;
enum rpc_gss_svc service;
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);
- struct gss_cl_ctx *old;
- old = gss_cred->gc_ctx;
+ 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_clear_bit();
clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
- if (old)
- gss_put_ctx(old);
-}
-
-static int
-gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
-{
- struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
- int res = 0;
-
- rcu_read_lock();
- if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx)
- res = 1;
- rcu_read_unlock();
- return res;
}
static const void *
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);
kfree(gss_msg);
}
spin_lock(&inode->i_lock);
if (gss_msg->ctx)
- gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
+ gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
else
task->tk_status = gss_msg->msg.errno;
gss_cred->gc_upcall = NULL;
static struct gss_upcall_msg *
gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
{
+ struct gss_cred *gss_cred = container_of(cred,
+ struct gss_cred, gc_base);
struct gss_upcall_msg *gss_new, *gss_msg;
+ uid_t uid = cred->cr_uid;
+
+ /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */
+ if (gss_cred->gc_machine_cred != 0)
+ uid = 0;
- gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
+ gss_new = gss_alloc_msg(gss_auth, uid);
if (gss_new == NULL)
return ERR_PTR(-ENOMEM);
gss_msg = gss_add_msg(gss_auth, gss_new);
}
spin_lock(&inode->i_lock);
if (gss_cred->gc_upcall != NULL)
- rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
- else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+ rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
+ else if (gss_msg->ctx != NULL) {
+ gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
+ gss_cred->gc_upcall = NULL;
+ rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+ } else if (gss_msg->msg.errno >= 0) {
task->tk_timeout = 0;
gss_cred->gc_upcall = gss_msg;
/* gss_upcall_callback will release the reference to gss_upcall_msg */
atomic_inc(&gss_msg->count);
- rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
+ rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
} else
err = gss_msg->msg.errno;
spin_unlock(&inode->i_lock);
schedule();
}
if (gss_msg->ctx)
- gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
+ gss_cred_set_ctx(cred, gss_msg->ctx);
else
err = gss_msg->msg.errno;
spin_unlock(&inode->i_lock);
char __user *dst, size_t buflen)
{
char *data = (char *)msg->data + msg->copied;
- ssize_t mlen = msg->len;
- ssize_t left;
+ size_t mlen = min(msg->len, buflen);
+ unsigned long left;
- if (mlen > buflen)
- mlen = buflen;
left = copy_to_user(dst, data, mlen);
- if (left < 0) {
- msg->errno = left;
- return left;
+ if (left == mlen) {
+ msg->errno = -EFAULT;
+ return -EFAULT;
}
+
mlen -= left;
msg->copied += mlen;
msg->errno = 0;
p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
if (IS_ERR(p)) {
err = PTR_ERR(p);
- gss_msg->msg.errno = (err == -EACCES) ? -EACCES : -EAGAIN;
+ gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES;
goto err_release_msg;
}
gss_msg->ctx = gss_get_ctx(ctx);
err = -EINVAL;
gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
if (!gss_auth->mech) {
- printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
- __FUNCTION__, flavor);
+ printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
+ __func__, flavor);
goto err_free;
}
gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
auth->au_ops = &authgss_ops;
auth->au_flavor = flavor;
atomic_set(&auth->au_count, 1);
+ kref_init(&gss_auth->kref);
gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name,
clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
return ERR_PTR(err);
}
+static void
+gss_free(struct gss_auth *gss_auth)
+{
+ rpc_unlink(gss_auth->dentry);
+ gss_auth->dentry = NULL;
+ gss_mech_put(gss_auth->mech);
+
+ kfree(gss_auth);
+ module_put(THIS_MODULE);
+}
+
+static void
+gss_free_callback(struct kref *kref)
+{
+ struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
+
+ gss_free(gss_auth);
+}
+
static void
gss_destroy(struct rpc_auth *auth)
{
rpcauth_destroy_credcache(auth);
gss_auth = container_of(auth, struct gss_auth, rpc_auth);
- rpc_unlink(gss_auth->dentry);
- gss_auth->dentry = NULL;
- gss_mech_put(gss_auth->mech);
+ kref_put(&gss_auth->kref, gss_free_callback);
+}
- kfree(gss_auth);
- module_put(THIS_MODULE);
+/*
+ * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
+ * to the server with the GSS control procedure field set to
+ * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
+ * all RPCSEC_GSS state associated with that context.
+ */
+static int
+gss_destroying_context(struct rpc_cred *cred)
+{
+ struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+ struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
+ struct rpc_task *task;
+
+ if (gss_cred->gc_ctx == NULL ||
+ test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
+ return 0;
+
+ gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
+ cred->cr_ops = &gss_nullops;
+
+ /* Take a reference to ensure the cred will be destroyed either
+ * by the RPC call or by the put_rpccred() below */
+ get_rpccred(cred);
+
+ task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
+ if (!IS_ERR(task))
+ rpc_put_task(task);
+
+ put_rpccred(cred);
+ return 1;
}
-/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
+/* 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
{
dprintk("RPC: gss_free_ctx\n");
- if (ctx->gc_gss_ctx)
- gss_delete_sec_context(&ctx->gc_gss_ctx);
-
kfree(ctx->gc_wire_ctx.data);
kfree(ctx);
}
static void
gss_free_ctx(struct gss_cl_ctx *ctx)
{
+ struct gss_ctx *gc_gss_ctx;
+
+ gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
+ rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
+ if (gc_gss_ctx)
+ gss_delete_sec_context(&gc_gss_ctx);
}
static void
gss_destroy_cred(struct rpc_cred *cred)
{
struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+ struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
+ if (gss_destroying_context(cred))
+ return;
rcu_assign_pointer(gss_cred->gc_ctx, NULL);
call_rcu(&cred->cr_rcu, gss_free_cred_callback);
if (ctx)
gss_put_ctx(ctx);
+ kref_put(&gss_auth->kref, gss_free_callback);
}
/*
*/
cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
cred->gc_service = gss_auth->service;
+ cred->gc_machine_cred = acred->machine_cred;
+ kref_get(&gss_auth->kref);
return &cred->gc_base;
out_err:
{
struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
- /*
- * If the searchflags have set RPCAUTH_LOOKUP_NEW, then
- * we don't really care if the credential has expired or not,
- * since the caller should be prepared to reinitialise it.
- */
- if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
+ if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
goto out;
/* Don't match with creds that have expired. */
- if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
+ if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
+ return 0;
+ if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
return 0;
out:
+ if (acred->machine_cred != gss_cred->gc_machine_cred)
+ return 0;
return (rc->cr_uid == acred->uid);
}
return NULL;
}
+static int gss_renew_cred(struct rpc_task *task)
+{
+ struct rpc_cred *oldcred = task->tk_msg.rpc_cred;
+ struct gss_cred *gss_cred = container_of(oldcred,
+ struct gss_cred,
+ gc_base);
+ struct rpc_auth *auth = oldcred->cr_auth;
+ struct auth_cred acred = {
+ .uid = oldcred->cr_uid,
+ .machine_cred = gss_cred->gc_machine_cred,
+ };
+ struct rpc_cred *new;
+
+ new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+ task->tk_msg.rpc_cred = new;
+ put_rpccred(oldcred);
+ return 0;
+}
+
/*
* Refresh credentials. XXX - finish
*/
static int
gss_refresh(struct rpc_task *task)
{
+ struct rpc_cred *cred = task->tk_msg.rpc_cred;
+ int ret = 0;
+
+ 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_msg.rpc_cred;
+ }
- if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
- return gss_refresh_upcall(task);
- return 0;
+ if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
+ ret = gss_refresh_upcall(task);
+out:
+ return ret;
+}
+
+/* Dummy refresh routine: used only when destroying the context */
+static int
+gss_refresh_null(struct rpc_task *task)
+{
+ return -EACCES;
}
static __be32 *
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)
+ if (maj_stat) {
+ dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
+ "error 0x%08x\n", task->tk_pid, maj_stat);
goto out_bad;
+ }
/* We leave it to unwrap to calculate au_rslack. For now we just
* calculate the length of the verifier: */
cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
*p++ = htonl(rqstp->rq_seqno);
- status = encode(rqstp, p, obj);
+ status = rpc_call_xdrproc(encode, rqstp, p, obj);
if (status)
return status;
offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
*p++ = htonl(rqstp->rq_seqno);
- status = encode(rqstp, p, obj);
+ status = rpc_call_xdrproc(encode, rqstp, p, obj);
if (status)
return status;
/* The spec seems a little ambiguous here, but I think that not
* wrapping context destruction requests makes the most sense.
*/
- status = encode(rqstp, p, obj);
+ status = rpc_call_xdrproc(encode, rqstp, p, obj);
goto out;
}
switch (gss_cred->gc_service) {
case RPC_GSS_SVC_NONE:
- status = encode(rqstp, p, obj);
+ status = rpc_call_xdrproc(encode, rqstp, p, obj);
break;
case RPC_GSS_SVC_INTEGRITY:
status = gss_wrap_req_integ(cred, ctx, encode,
cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
+ (savedlen - head->iov_len);
out_decode:
- status = decode(rqstp, p, obj);
+ status = rpc_call_xdrproc(decode, rqstp, p, obj);
out:
gss_put_ctx(ctx);
dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
static const struct rpc_authops authgss_ops = {
.owner = THIS_MODULE,
.au_flavor = RPC_AUTH_GSS,
-#ifdef RPC_DEBUG
.au_name = "RPCSEC_GSS",
-#endif
.create = gss_create,
.destroy = gss_destroy,
.lookup_cred = gss_lookup_cred,
.cr_name = "AUTH_GSS",
.crdestroy = gss_destroy_cred,
.cr_init = gss_cred_init,
+ .crbind = rpcauth_generic_bind_cred,
.crmatch = gss_match,
.crmarshal = gss_marshal,
.crrefresh = gss_refresh,
.crunwrap_resp = gss_unwrap_resp,
};
+static const struct rpc_credops gss_nullops = {
+ .cr_name = "AUTH_GSS",
+ .crdestroy = gss_destroy_cred,
+ .crbind = rpcauth_generic_bind_cred,
+ .crmatch = gss_match,
+ .crmarshal = gss_marshal,
+ .crrefresh = gss_refresh_null,
+ .crvalidate = gss_validate,
+ .crwrap_req = gss_wrap_req,
+ .crunwrap_resp = gss_unwrap_resp,
+};
+
static struct rpc_pipe_ops gss_upcall_ops = {
.upcall = gss_pipe_upcall,
.downcall = gss_pipe_downcall,
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