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![Luis R. Rodriguez](/assets/img/avatar_default.png)
Most code already uses consts for the struct kernel_param_ops, sweep the kernel for the last offending stragglers. Other than include/linux/moduleparam.h and kernel/params.c all other changes were generated with the following Coccinelle SmPL patch. Merge conflicts between trees can be handled with Coccinelle. In the future git could get Coccinelle merge support to deal with patch --> fail --> grammar --> Coccinelle --> new patch conflicts automatically for us on patches where the grammar is available and the patch is of high confidence. Consider this a feature request. Test compiled on x86_64 against: * allnoconfig * allmodconfig * allyesconfig @ const_found @ identifier ops; @@ const struct kernel_param_ops ops = { }; @ const_not_found depends on !const_found @ identifier ops; @@ -struct kernel_param_ops ops = { +const struct kernel_param_ops ops = { }; Generated-by: Coccinelle SmPL Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Junio C Hamano <gitster@pobox.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: cocci@systeme.lip6.fr Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
891 lines
21 KiB
C
891 lines
21 KiB
C
/*
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* linux/net/sunrpc/auth.c
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*
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* Generic RPC client authentication API.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/hash.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/spinlock.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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#define RPC_CREDCACHE_DEFAULT_HASHBITS (4)
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struct rpc_cred_cache {
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struct hlist_head *hashtable;
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unsigned int hashbits;
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spinlock_t lock;
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};
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static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS;
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static DEFINE_SPINLOCK(rpc_authflavor_lock);
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static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
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&authnull_ops, /* AUTH_NULL */
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&authunix_ops, /* AUTH_UNIX */
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NULL, /* others can be loadable modules */
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};
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static LIST_HEAD(cred_unused);
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static unsigned long number_cred_unused;
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#define MAX_HASHTABLE_BITS (14)
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static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp)
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{
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unsigned long num;
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unsigned int nbits;
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int ret;
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if (!val)
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goto out_inval;
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ret = kstrtoul(val, 0, &num);
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if (ret == -EINVAL)
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goto out_inval;
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nbits = fls(num);
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if (num > (1U << nbits))
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nbits++;
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if (nbits > MAX_HASHTABLE_BITS || nbits < 2)
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goto out_inval;
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*(unsigned int *)kp->arg = nbits;
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return 0;
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out_inval:
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return -EINVAL;
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}
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static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp)
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{
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unsigned int nbits;
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nbits = *(unsigned int *)kp->arg;
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return sprintf(buffer, "%u", 1U << nbits);
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}
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#define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int);
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static const struct kernel_param_ops param_ops_hashtbl_sz = {
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.set = param_set_hashtbl_sz,
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.get = param_get_hashtbl_sz,
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};
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module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644);
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MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size");
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static unsigned long auth_max_cred_cachesize = ULONG_MAX;
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module_param(auth_max_cred_cachesize, ulong, 0644);
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MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size");
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static u32
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pseudoflavor_to_flavor(u32 flavor) {
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if (flavor > RPC_AUTH_MAXFLAVOR)
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return RPC_AUTH_GSS;
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return flavor;
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}
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int
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rpcauth_register(const struct rpc_authops *ops)
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{
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rpc_authflavor_t flavor;
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int ret = -EPERM;
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if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
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return -EINVAL;
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spin_lock(&rpc_authflavor_lock);
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if (auth_flavors[flavor] == NULL) {
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auth_flavors[flavor] = ops;
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ret = 0;
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}
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spin_unlock(&rpc_authflavor_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rpcauth_register);
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int
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rpcauth_unregister(const struct rpc_authops *ops)
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{
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rpc_authflavor_t flavor;
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int ret = -EPERM;
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if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
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return -EINVAL;
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spin_lock(&rpc_authflavor_lock);
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if (auth_flavors[flavor] == ops) {
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auth_flavors[flavor] = NULL;
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ret = 0;
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}
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spin_unlock(&rpc_authflavor_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rpcauth_unregister);
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/**
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* rpcauth_get_pseudoflavor - check if security flavor is supported
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* @flavor: a security flavor
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* @info: a GSS mech OID, quality of protection, and service value
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*
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* Verifies that an appropriate kernel module is available or already loaded.
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* Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is
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* not supported locally.
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*/
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rpc_authflavor_t
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rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info)
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{
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const struct rpc_authops *ops;
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rpc_authflavor_t pseudoflavor;
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ops = auth_flavors[flavor];
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if (ops == NULL)
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request_module("rpc-auth-%u", flavor);
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spin_lock(&rpc_authflavor_lock);
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ops = auth_flavors[flavor];
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if (ops == NULL || !try_module_get(ops->owner)) {
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spin_unlock(&rpc_authflavor_lock);
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return RPC_AUTH_MAXFLAVOR;
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}
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spin_unlock(&rpc_authflavor_lock);
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pseudoflavor = flavor;
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if (ops->info2flavor != NULL)
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pseudoflavor = ops->info2flavor(info);
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module_put(ops->owner);
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return pseudoflavor;
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}
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EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor);
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/**
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* rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor
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* @pseudoflavor: GSS pseudoflavor to match
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* @info: rpcsec_gss_info structure to fill in
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*
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* Returns zero and fills in "info" if pseudoflavor matches a
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* supported mechanism.
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*/
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int
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rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info)
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{
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rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor);
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const struct rpc_authops *ops;
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int result;
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if (flavor >= RPC_AUTH_MAXFLAVOR)
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return -EINVAL;
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ops = auth_flavors[flavor];
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if (ops == NULL)
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request_module("rpc-auth-%u", flavor);
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spin_lock(&rpc_authflavor_lock);
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ops = auth_flavors[flavor];
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if (ops == NULL || !try_module_get(ops->owner)) {
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spin_unlock(&rpc_authflavor_lock);
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return -ENOENT;
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}
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spin_unlock(&rpc_authflavor_lock);
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result = -ENOENT;
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if (ops->flavor2info != NULL)
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result = ops->flavor2info(pseudoflavor, info);
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module_put(ops->owner);
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return result;
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}
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EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo);
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/**
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* rpcauth_list_flavors - discover registered flavors and pseudoflavors
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* @array: array to fill in
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* @size: size of "array"
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*
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* Returns the number of array items filled in, or a negative errno.
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*
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* The returned array is not sorted by any policy. Callers should not
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* rely on the order of the items in the returned array.
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*/
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int
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rpcauth_list_flavors(rpc_authflavor_t *array, int size)
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{
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rpc_authflavor_t flavor;
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int result = 0;
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spin_lock(&rpc_authflavor_lock);
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for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) {
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const struct rpc_authops *ops = auth_flavors[flavor];
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rpc_authflavor_t pseudos[4];
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int i, len;
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if (result >= size) {
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result = -ENOMEM;
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break;
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}
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if (ops == NULL)
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continue;
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if (ops->list_pseudoflavors == NULL) {
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array[result++] = ops->au_flavor;
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continue;
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}
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len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos));
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if (len < 0) {
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result = len;
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break;
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}
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for (i = 0; i < len; i++) {
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if (result >= size) {
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result = -ENOMEM;
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break;
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}
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array[result++] = pseudos[i];
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}
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}
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spin_unlock(&rpc_authflavor_lock);
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dprintk("RPC: %s returns %d\n", __func__, result);
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return result;
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}
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EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
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struct rpc_auth *
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rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
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{
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struct rpc_auth *auth;
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const struct rpc_authops *ops;
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u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor);
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auth = ERR_PTR(-EINVAL);
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if (flavor >= RPC_AUTH_MAXFLAVOR)
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goto out;
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if ((ops = auth_flavors[flavor]) == NULL)
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request_module("rpc-auth-%u", flavor);
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spin_lock(&rpc_authflavor_lock);
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ops = auth_flavors[flavor];
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if (ops == NULL || !try_module_get(ops->owner)) {
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spin_unlock(&rpc_authflavor_lock);
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goto out;
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}
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spin_unlock(&rpc_authflavor_lock);
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auth = ops->create(args, clnt);
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module_put(ops->owner);
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if (IS_ERR(auth))
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return auth;
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if (clnt->cl_auth)
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rpcauth_release(clnt->cl_auth);
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clnt->cl_auth = auth;
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out:
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return auth;
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}
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EXPORT_SYMBOL_GPL(rpcauth_create);
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void
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rpcauth_release(struct rpc_auth *auth)
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{
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if (!atomic_dec_and_test(&auth->au_count))
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return;
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auth->au_ops->destroy(auth);
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}
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static DEFINE_SPINLOCK(rpc_credcache_lock);
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static void
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rpcauth_unhash_cred_locked(struct rpc_cred *cred)
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{
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hlist_del_rcu(&cred->cr_hash);
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smp_mb__before_atomic();
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clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
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}
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static int
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rpcauth_unhash_cred(struct rpc_cred *cred)
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{
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spinlock_t *cache_lock;
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int ret;
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cache_lock = &cred->cr_auth->au_credcache->lock;
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spin_lock(cache_lock);
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ret = atomic_read(&cred->cr_count) == 0;
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if (ret)
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rpcauth_unhash_cred_locked(cred);
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spin_unlock(cache_lock);
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return ret;
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}
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/*
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* Initialize RPC credential cache
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*/
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int
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rpcauth_init_credcache(struct rpc_auth *auth)
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{
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struct rpc_cred_cache *new;
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unsigned int hashsize;
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new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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goto out_nocache;
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new->hashbits = auth_hashbits;
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hashsize = 1U << new->hashbits;
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new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL);
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if (!new->hashtable)
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goto out_nohashtbl;
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spin_lock_init(&new->lock);
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auth->au_credcache = new;
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return 0;
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out_nohashtbl:
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kfree(new);
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out_nocache:
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return -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(rpcauth_init_credcache);
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/*
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* Setup a credential key lifetime timeout notification
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*/
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int
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rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
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{
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if (!cred->cr_auth->au_ops->key_timeout)
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return 0;
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return cred->cr_auth->au_ops->key_timeout(auth, cred);
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}
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EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
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bool
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rpcauth_cred_key_to_expire(struct rpc_cred *cred)
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{
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if (!cred->cr_ops->crkey_to_expire)
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return false;
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return cred->cr_ops->crkey_to_expire(cred);
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}
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EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
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char *
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rpcauth_stringify_acceptor(struct rpc_cred *cred)
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{
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if (!cred->cr_ops->crstringify_acceptor)
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return NULL;
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return cred->cr_ops->crstringify_acceptor(cred);
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}
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EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor);
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/*
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* Destroy a list of credentials
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*/
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static inline
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void rpcauth_destroy_credlist(struct list_head *head)
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{
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struct rpc_cred *cred;
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while (!list_empty(head)) {
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cred = list_entry(head->next, struct rpc_cred, cr_lru);
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list_del_init(&cred->cr_lru);
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put_rpccred(cred);
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}
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}
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/*
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* Clear the RPC credential cache, and delete those credentials
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* that are not referenced.
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*/
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void
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rpcauth_clear_credcache(struct rpc_cred_cache *cache)
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{
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LIST_HEAD(free);
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struct hlist_head *head;
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struct rpc_cred *cred;
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unsigned int hashsize = 1U << cache->hashbits;
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int i;
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spin_lock(&rpc_credcache_lock);
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spin_lock(&cache->lock);
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for (i = 0; i < hashsize; i++) {
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head = &cache->hashtable[i];
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while (!hlist_empty(head)) {
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cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
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get_rpccred(cred);
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if (!list_empty(&cred->cr_lru)) {
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list_del(&cred->cr_lru);
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number_cred_unused--;
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}
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list_add_tail(&cred->cr_lru, &free);
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rpcauth_unhash_cred_locked(cred);
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}
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}
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spin_unlock(&cache->lock);
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spin_unlock(&rpc_credcache_lock);
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rpcauth_destroy_credlist(&free);
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}
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/*
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* Destroy the RPC credential cache
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*/
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void
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rpcauth_destroy_credcache(struct rpc_auth *auth)
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{
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struct rpc_cred_cache *cache = auth->au_credcache;
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if (cache) {
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auth->au_credcache = NULL;
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rpcauth_clear_credcache(cache);
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kfree(cache->hashtable);
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kfree(cache);
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}
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}
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EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache);
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#define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ)
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/*
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* Remove stale credentials. Avoid sleeping inside the loop.
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*/
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static long
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rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
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{
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spinlock_t *cache_lock;
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struct rpc_cred *cred, *next;
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unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM;
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long freed = 0;
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list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) {
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if (nr_to_scan-- == 0)
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break;
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/*
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* Enforce a 60 second garbage collection moratorium
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* Note that the cred_unused list must be time-ordered.
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*/
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if (time_in_range(cred->cr_expire, expired, jiffies) &&
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test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0)
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break;
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list_del_init(&cred->cr_lru);
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number_cred_unused--;
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freed++;
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if (atomic_read(&cred->cr_count) != 0)
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continue;
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cache_lock = &cred->cr_auth->au_credcache->lock;
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spin_lock(cache_lock);
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if (atomic_read(&cred->cr_count) == 0) {
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get_rpccred(cred);
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list_add_tail(&cred->cr_lru, free);
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rpcauth_unhash_cred_locked(cred);
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}
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spin_unlock(cache_lock);
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}
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return freed;
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}
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static unsigned long
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rpcauth_cache_do_shrink(int nr_to_scan)
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{
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LIST_HEAD(free);
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unsigned long freed;
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spin_lock(&rpc_credcache_lock);
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freed = rpcauth_prune_expired(&free, nr_to_scan);
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spin_unlock(&rpc_credcache_lock);
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rpcauth_destroy_credlist(&free);
|
|
|
|
return freed;
|
|
}
|
|
|
|
/*
|
|
* Run memory cache shrinker.
|
|
*/
|
|
static unsigned long
|
|
rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
|
|
|
|
{
|
|
if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL)
|
|
return SHRINK_STOP;
|
|
|
|
/* nothing left, don't come back */
|
|
if (list_empty(&cred_unused))
|
|
return SHRINK_STOP;
|
|
|
|
return rpcauth_cache_do_shrink(sc->nr_to_scan);
|
|
}
|
|
|
|
static unsigned long
|
|
rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
|
|
|
|
{
|
|
return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
|
|
}
|
|
|
|
static void
|
|
rpcauth_cache_enforce_limit(void)
|
|
{
|
|
unsigned long diff;
|
|
unsigned int nr_to_scan;
|
|
|
|
if (number_cred_unused <= auth_max_cred_cachesize)
|
|
return;
|
|
diff = number_cred_unused - auth_max_cred_cachesize;
|
|
nr_to_scan = 100;
|
|
if (diff < nr_to_scan)
|
|
nr_to_scan = diff;
|
|
rpcauth_cache_do_shrink(nr_to_scan);
|
|
}
|
|
|
|
/*
|
|
* Look up a process' credentials in the authentication cache
|
|
*/
|
|
struct rpc_cred *
|
|
rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
|
|
int flags)
|
|
{
|
|
LIST_HEAD(free);
|
|
struct rpc_cred_cache *cache = auth->au_credcache;
|
|
struct rpc_cred *cred = NULL,
|
|
*entry, *new;
|
|
unsigned int nr;
|
|
|
|
nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits);
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) {
|
|
if (!entry->cr_ops->crmatch(acred, entry, flags))
|
|
continue;
|
|
if (flags & RPCAUTH_LOOKUP_RCU) {
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) &&
|
|
!test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags))
|
|
cred = entry;
|
|
break;
|
|
}
|
|
spin_lock(&cache->lock);
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
|
|
spin_unlock(&cache->lock);
|
|
continue;
|
|
}
|
|
cred = get_rpccred(entry);
|
|
spin_unlock(&cache->lock);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (cred != NULL)
|
|
goto found;
|
|
|
|
if (flags & RPCAUTH_LOOKUP_RCU)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
new = auth->au_ops->crcreate(auth, acred, flags);
|
|
if (IS_ERR(new)) {
|
|
cred = new;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&cache->lock);
|
|
hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) {
|
|
if (!entry->cr_ops->crmatch(acred, entry, flags))
|
|
continue;
|
|
cred = get_rpccred(entry);
|
|
break;
|
|
}
|
|
if (cred == NULL) {
|
|
cred = new;
|
|
set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
|
|
hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
|
|
} else
|
|
list_add_tail(&new->cr_lru, &free);
|
|
spin_unlock(&cache->lock);
|
|
rpcauth_cache_enforce_limit();
|
|
found:
|
|
if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
|
|
cred->cr_ops->cr_init != NULL &&
|
|
!(flags & RPCAUTH_LOOKUP_NEW)) {
|
|
int res = cred->cr_ops->cr_init(auth, cred);
|
|
if (res < 0) {
|
|
put_rpccred(cred);
|
|
cred = ERR_PTR(res);
|
|
}
|
|
}
|
|
rpcauth_destroy_credlist(&free);
|
|
out:
|
|
return cred;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache);
|
|
|
|
struct rpc_cred *
|
|
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
|
|
{
|
|
struct auth_cred acred;
|
|
struct rpc_cred *ret;
|
|
const struct cred *cred = current_cred();
|
|
|
|
dprintk("RPC: looking up %s cred\n",
|
|
auth->au_ops->au_name);
|
|
|
|
memset(&acred, 0, sizeof(acred));
|
|
acred.uid = cred->fsuid;
|
|
acred.gid = cred->fsgid;
|
|
acred.group_info = cred->group_info;
|
|
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcauth_lookupcred);
|
|
|
|
void
|
|
rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
|
|
struct rpc_auth *auth, const struct rpc_credops *ops)
|
|
{
|
|
INIT_HLIST_NODE(&cred->cr_hash);
|
|
INIT_LIST_HEAD(&cred->cr_lru);
|
|
atomic_set(&cred->cr_count, 1);
|
|
cred->cr_auth = auth;
|
|
cred->cr_ops = ops;
|
|
cred->cr_expire = jiffies;
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
cred->cr_magic = RPCAUTH_CRED_MAGIC;
|
|
#endif
|
|
cred->cr_uid = acred->uid;
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcauth_init_cred);
|
|
|
|
struct rpc_cred *
|
|
rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags)
|
|
{
|
|
dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
|
|
cred->cr_auth->au_ops->au_name, cred);
|
|
return get_rpccred(cred);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred);
|
|
|
|
static struct rpc_cred *
|
|
rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
|
|
{
|
|
struct rpc_auth *auth = task->tk_client->cl_auth;
|
|
struct auth_cred acred = {
|
|
.uid = GLOBAL_ROOT_UID,
|
|
.gid = GLOBAL_ROOT_GID,
|
|
};
|
|
|
|
dprintk("RPC: %5u looking up %s cred\n",
|
|
task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
|
|
return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
|
|
}
|
|
|
|
static struct rpc_cred *
|
|
rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags)
|
|
{
|
|
struct rpc_auth *auth = task->tk_client->cl_auth;
|
|
|
|
dprintk("RPC: %5u looking up %s cred\n",
|
|
task->tk_pid, auth->au_ops->au_name);
|
|
return rpcauth_lookupcred(auth, lookupflags);
|
|
}
|
|
|
|
static int
|
|
rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_cred *new;
|
|
int lookupflags = 0;
|
|
|
|
if (flags & RPC_TASK_ASYNC)
|
|
lookupflags |= RPCAUTH_LOOKUP_NEW;
|
|
if (cred != NULL)
|
|
new = cred->cr_ops->crbind(task, cred, lookupflags);
|
|
else if (flags & RPC_TASK_ROOTCREDS)
|
|
new = rpcauth_bind_root_cred(task, lookupflags);
|
|
else
|
|
new = rpcauth_bind_new_cred(task, lookupflags);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
if (req->rq_cred != NULL)
|
|
put_rpccred(req->rq_cred);
|
|
req->rq_cred = new;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
put_rpccred(struct rpc_cred *cred)
|
|
{
|
|
/* Fast path for unhashed credentials */
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
|
|
if (atomic_dec_and_test(&cred->cr_count))
|
|
cred->cr_ops->crdestroy(cred);
|
|
return;
|
|
}
|
|
|
|
if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
|
|
return;
|
|
if (!list_empty(&cred->cr_lru)) {
|
|
number_cred_unused--;
|
|
list_del_init(&cred->cr_lru);
|
|
}
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
|
|
if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
|
|
cred->cr_expire = jiffies;
|
|
list_add_tail(&cred->cr_lru, &cred_unused);
|
|
number_cred_unused++;
|
|
goto out_nodestroy;
|
|
}
|
|
if (!rpcauth_unhash_cred(cred)) {
|
|
/* We were hashed and someone looked us up... */
|
|
goto out_nodestroy;
|
|
}
|
|
}
|
|
spin_unlock(&rpc_credcache_lock);
|
|
cred->cr_ops->crdestroy(cred);
|
|
return;
|
|
out_nodestroy:
|
|
spin_unlock(&rpc_credcache_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(put_rpccred);
|
|
|
|
__be32 *
|
|
rpcauth_marshcred(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u marshaling %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crmarshal(task, p);
|
|
}
|
|
|
|
__be32 *
|
|
rpcauth_checkverf(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u validating %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crvalidate(task, p);
|
|
}
|
|
|
|
static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
|
|
encode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crwrap_req)
|
|
return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
|
|
/* By default, we encode the arguments normally. */
|
|
rpcauth_wrap_req_encode(encode, rqstp, data, obj);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
|
|
return decode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crunwrap_resp)
|
|
return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
|
|
data, obj);
|
|
/* By default, we decode the arguments normally. */
|
|
return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_refreshcred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred;
|
|
int err;
|
|
|
|
cred = task->tk_rqstp->rq_cred;
|
|
if (cred == NULL) {
|
|
err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags);
|
|
if (err < 0)
|
|
goto out;
|
|
cred = task->tk_rqstp->rq_cred;
|
|
}
|
|
dprintk("RPC: %5u refreshing %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
|
|
err = cred->cr_ops->crrefresh(task);
|
|
out:
|
|
if (err < 0)
|
|
task->tk_status = err;
|
|
return err;
|
|
}
|
|
|
|
void
|
|
rpcauth_invalcred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u invalidating %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
if (cred)
|
|
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
|
|
}
|
|
|
|
int
|
|
rpcauth_uptodatecred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
return cred == NULL ||
|
|
test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
|
|
}
|
|
|
|
static struct shrinker rpc_cred_shrinker = {
|
|
.count_objects = rpcauth_cache_shrink_count,
|
|
.scan_objects = rpcauth_cache_shrink_scan,
|
|
.seeks = DEFAULT_SEEKS,
|
|
};
|
|
|
|
int __init rpcauth_init_module(void)
|
|
{
|
|
int err;
|
|
|
|
err = rpc_init_authunix();
|
|
if (err < 0)
|
|
goto out1;
|
|
err = rpc_init_generic_auth();
|
|
if (err < 0)
|
|
goto out2;
|
|
register_shrinker(&rpc_cred_shrinker);
|
|
return 0;
|
|
out2:
|
|
rpc_destroy_authunix();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
void rpcauth_remove_module(void)
|
|
{
|
|
rpc_destroy_authunix();
|
|
rpc_destroy_generic_auth();
|
|
unregister_shrinker(&rpc_cred_shrinker);
|
|
}
|