![Trond Myklebust](/assets/img/avatar_default.png)
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
893 lines
21 KiB
C
893 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);
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return freed;
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}
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/*
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* Run memory cache shrinker.
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*/
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static unsigned long
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rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
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{
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if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL)
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return SHRINK_STOP;
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/* nothing left, don't come back */
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if (list_empty(&cred_unused))
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return SHRINK_STOP;
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return rpcauth_cache_do_shrink(sc->nr_to_scan);
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}
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static unsigned long
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rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
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{
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return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
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}
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|
|
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, gfp_t gfp)
|
|
{
|
|
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, gfp);
|
|
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);
|
|
put_rpccred(req->rq_cred);
|
|
req->rq_cred = new;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
put_rpccred(struct rpc_cred *cred)
|
|
{
|
|
if (cred == NULL)
|
|
return;
|
|
/* 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);
|
|
}
|