patch-2.1.32 linux/net/sunrpc/auth.c

• Lines: 296
• Date: Fri Dec 13 06:53:18 1996
• Orig file: v2.1.31/linux/net/sunrpc/auth.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/net/sunrpc/auth.c linux/net/sunrpc/auth.c
@@ -0,0 +1,295 @@
+/*
+ * linux/fs/nfs/rpcauth.c
+ *
+ * Generic RPC authentication API.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/malloc.h>
+#include <linux/errno.h>
+#include <linux/socket.h>
+#include <linux/sunrpc/clnt.h>
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define RPC_MAXFLAVOR	8
+
+static struct rpc_authops *	auth_flavors[RPC_MAXFLAVOR] = {
+	&authnull_ops,		/* AUTH_NULL */
+	&authunix_ops,		/* AUTH_UNIX */
+	NULL,			/* others can be loadable modules */
+};
+
+int
+rpcauth_register(struct rpc_authops *ops)
+{
+	unsigned int	flavor;
+
+	if ((flavor = ops->au_flavor) >= RPC_MAXFLAVOR)
+		return -EINVAL;
+	if (auth_flavors[flavor] != NULL)
+		return -EPERM;		/* what else? */
+	auth_flavors[flavor] = ops;
+	return 0;
+}
+
+int
+rpcauth_unregister(struct rpc_authops *ops)
+{
+	unsigned int	flavor;
+
+	if ((flavor = ops->au_flavor) >= RPC_MAXFLAVOR)
+		return -EINVAL;
+	if (auth_flavors[flavor] != ops)
+		return -EPERM;		/* what else? */
+	auth_flavors[flavor] = NULL;
+	return 0;
+}
+
+struct rpc_auth *
+rpcauth_create(unsigned int flavor, struct rpc_clnt *clnt)
+{
+	struct rpc_authops	*ops;
+
+	if (flavor >= RPC_MAXFLAVOR || !(ops = auth_flavors[flavor]))
+		return NULL;
+	clnt->cl_auth = ops->create(clnt);
+	return clnt->cl_auth;
+}
+
+void
+rpcauth_destroy(struct rpc_auth *auth)
+{
+	auth->au_ops->destroy(auth);
+}
+
+/*
+ * Initialize RPC credential cache
+ */
+void
+rpcauth_init_credcache(struct rpc_auth *auth)
+{
+	memset(auth->au_credcache, 0, sizeof(auth->au_credcache));
+	auth->au_nextgc = jiffies + (auth->au_expire >> 1);
+}
+
+/*
+ * Clear the RPC credential cache
+ */
+void
+rpcauth_free_credcache(struct rpc_auth *auth)
+{
+	struct rpc_cred	**q, *cred;
+	void		(*destroy)(struct rpc_cred *);
+	int		i;
+
+	if (!(destroy = auth->au_ops->crdestroy))
+		destroy = (void (*)(struct rpc_cred *)) rpc_free;
+
+	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
+		q = &auth->au_credcache[i];
+		while ((cred = *q) != NULL) {
+			*q = cred->cr_next;
+			destroy(cred);
+		}
+	}
+}
+
+/*
+ * Remove stale credentials. Avoid sleeping inside the loop.
+ */
+static void
+rpcauth_gc_credcache(struct rpc_auth *auth)
+{
+	struct rpc_cred	**q, *cred, *free = NULL;
+	int		i, safe = 0;
+
+	dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
+	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
+		q = &auth->au_credcache[i];
+		while ((cred = *q) != NULL) {
+			if (++safe > 500) {
+				printk("RPC: rpcauth_gc_credcache looping!\n");
+				break;
+			}
+			if (!cred->cr_count && cred->cr_expire < jiffies) {
+				*q = cred->cr_next;
+				cred->cr_next = free;
+				free = cred;
+				continue;
+			}
+			q = &cred->cr_next;
+		}
+	}
+	while ((cred = free) != NULL) {
+		free = cred->cr_next;
+		rpc_free(cred);
+	}
+	auth->au_nextgc = jiffies + auth->au_expire;
+}
+
+/*
+ * Insert credential into cache
+ */
+inline void
+rpcauth_insert_credcache(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+	int		nr;
+
+	nr = (cred->cr_uid % RPC_CREDCACHE_NR);
+	cred->cr_next = auth->au_credcache[nr];
+	auth->au_credcache[nr] = cred;
+	cred->cr_expire = jiffies + auth->au_expire;
+	cred->cr_count++;
+}
+
+/*
+ * Look up a process' credentials in the authentication cache
+ */
+static struct rpc_cred *
+rpcauth_lookup_credcache(struct rpc_task *task)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+	struct rpc_cred	**q, *cred = NULL;
+	int		nr;
+
+	nr = RPC_DO_ROOTOVERRIDE(task)? 0 : (current->uid % RPC_CREDCACHE_NR);
+
+	if (auth->au_nextgc < jiffies)
+		rpcauth_gc_credcache(auth);
+
+	q = &auth->au_credcache[nr];
+	while ((cred = *q) != NULL) {
+		if (auth->au_ops->crmatch(task, cred)) {
+			*q = cred->cr_next;
+			break;
+		}
+		q = &cred->cr_next;
+	}
+
+	if (!cred)
+		cred = auth->au_ops->crcreate(task);
+
+	rpcauth_insert_credcache(auth, cred);
+
+	return (struct rpc_cred *) cred;
+}
+
+/*
+ * Remove cred handle from cache
+ */
+static inline void
+rpcauth_remove_credcache(struct rpc_auth *auth, struct rpc_cred *cred)
+{
+	struct rpc_cred	**q, *cr;
+	int		nr;
+
+	nr = (cred->cr_uid % RPC_CREDCACHE_NR);
+	q = &auth->au_credcache[nr];
+	while ((cr = *q) != NULL) {
+		if (cred == cr) {
+			*q = cred->cr_next;
+			return;
+		}
+		q = &cred->cr_next;
+	}
+}
+
+struct rpc_cred *
+rpcauth_lookupcred(struct rpc_task *task)
+{
+	dprintk("RPC: %4d looking up %s cred\n",
+		task->tk_pid, task->tk_auth->au_ops->au_name);
+	return task->tk_cred = rpcauth_lookup_credcache(task);
+}
+
+int
+rpcauth_matchcred(struct rpc_task *task, struct rpc_cred *cred)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+
+	dprintk("RPC: %4d matching %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, task->tk_cred);
+	return auth->au_ops->crmatch(task, cred);
+}
+
+void
+rpcauth_holdcred(struct rpc_task *task)
+{
+	dprintk("RPC: %4d holding %s cred %p\n",
+		task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_cred);
+	if (task->tk_cred)
+		task->tk_cred->cr_count++;
+}
+
+void
+rpcauth_releasecred(struct rpc_task *task)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+	struct rpc_cred	*cred;
+
+	dprintk("RPC: %4d releasing %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, task->tk_cred);
+	if ((cred = task->tk_cred) != NULL) {
+		cred->cr_count--;
+		if (cred->cr_flags & RPCAUTH_CRED_DEAD) {
+			rpcauth_remove_credcache(auth, cred);
+			if (!cred->cr_count)
+				auth->au_ops->crdestroy(cred);
+		}
+		task->tk_cred = NULL;
+	}
+}
+
+u32 *
+rpcauth_marshcred(struct rpc_task *task, u32 *p)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+
+	dprintk("RPC: %4d marshaling %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, task->tk_cred);
+	return auth->au_ops->crmarshal(task, p,
+				task->tk_flags & RPC_CALL_REALUID);
+}
+
+u32 *
+rpcauth_checkverf(struct rpc_task *task, u32 *p)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+
+	dprintk("RPC: %4d validating %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, task->tk_cred);
+	return auth->au_ops->crvalidate(task, p);
+}
+
+int
+rpcauth_refreshcred(struct rpc_task *task)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+
+	dprintk("RPC: %4d refreshing %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, task->tk_cred);
+	task->tk_status = auth->au_ops->crrefresh(task);
+	return task->tk_status;
+}
+
+void
+rpcauth_invalcred(struct rpc_task *task)
+{
+	dprintk("RPC: %4d invalidating %s cred %p\n",
+		task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_cred);
+	if (task->tk_cred)
+		task->tk_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+}
+
+int
+rpcauth_uptodatecred(struct rpc_task *task)
+{
+	return !(task->tk_cred) ||
+		(task->tk_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
+}