On Thu, Mar 13, 2008 at 01:48:09PM -0400, Trond Myklebust wrote:
> Add an rpc credential that is not tied to any particular auth mechanism,
> but that can be cached by NFS, and later used to look up a cred for
> whichever auth mechanism that turns out to be valid when the RPC call is
> being made.
>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> ---
>
> include/linux/sunrpc/auth.h | 3 +
> net/sunrpc/Makefile | 2 -
> net/sunrpc/auth.c | 1
> net/sunrpc/auth_generic.c | 142 +++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 147 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
> index 348546c..70644ed 100644
> --- a/include/linux/sunrpc/auth.h
> +++ b/include/linux/sunrpc/auth.h
> @@ -125,9 +125,12 @@ extern const struct rpc_authops authunix_ops;
> extern const struct rpc_authops authnull_ops;
>
> void __init rpc_init_authunix(void);
> +void __init rpc_init_generic_auth(void);
> void __init rpcauth_init_module(void);
> void __exit rpcauth_remove_module(void);
> +void __exit rpc_destroy_generic_auth(void);
>
> +struct rpc_cred * rpc_lookup_cred(void);
> int rpcauth_register(const struct rpc_authops *);
> int rpcauth_unregister(const struct rpc_authops *);
> struct rpc_auth * rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
> diff --git a/net/sunrpc/Makefile b/net/sunrpc/Makefile
> index 92e1dbe..5369aa3 100644
> --- a/net/sunrpc/Makefile
> +++ b/net/sunrpc/Makefile
> @@ -8,7 +8,7 @@ obj-$(CONFIG_SUNRPC_GSS) += auth_gss/
> obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma/
>
> sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \
> - auth.o auth_null.o auth_unix.o \
> + auth.o auth_null.o auth_unix.o auth_generic.o \
> svc.o svcsock.o svcauth.o svcauth_unix.o \
> rpcb_clnt.o timer.o xdr.o \
> sunrpc_syms.o cache.o rpc_pipe.o \
> diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
> index 1cdb163..012f2a3 100644
> --- a/net/sunrpc/auth.c
> +++ b/net/sunrpc/auth.c
> @@ -566,6 +566,7 @@ static struct shrinker rpc_cred_shrinker = {
> void __init rpcauth_init_module(void)
> {
> rpc_init_authunix();
> + rpc_init_generic_auth();
> register_shrinker(&rpc_cred_shrinker);
> }
>
> diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
> new file mode 100644
> index 0000000..6f129b1
> --- /dev/null
> +++ b/net/sunrpc/auth_generic.c
> @@ -0,0 +1,142 @@
> +/*
> + * Generic RPC credential
> + *
> + * Copyright (C) 2008, Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> + */
> +
> +#include <linux/err.h>
> +#include <linux/types.h>
> +#include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/sunrpc/auth.h>
> +#include <linux/sunrpc/clnt.h>
> +#include <linux/sunrpc/debug.h>
> +#include <linux/sunrpc/sched.h>
> +
> +#ifdef RPC_DEBUG
> +# define RPCDBG_FACILITY RPCDBG_AUTH
> +#endif
> +
> +struct generic_cred {
> + struct rpc_cred gc_base;
> + struct auth_cred acred;
> +};
Does generic_cred need both gc_base.cr_uid and acred.uid? Will those
ever disagree?
--b.
> +
> +static struct rpc_auth generic_auth;
> +static struct rpc_cred_cache generic_cred_cache;
> +static const struct rpc_credops generic_credops;
> +
> +/*
> + * Public call interface
> + */
> +struct rpc_cred *rpc_lookup_cred(void)
> +{
> + return rpcauth_lookupcred(&generic_auth, 0);
> +}
> +EXPORT_SYMBOL_GPL(rpc_lookup_cred);
> +
> +/*
> + * Lookup generic creds for current process
> + */
> +static struct rpc_cred *
> +generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
> +{
> + return rpcauth_lookup_credcache(&generic_auth, acred, flags);
> +}
> +
> +static struct rpc_cred *
> +generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
> +{
> + struct generic_cred *gcred;
> +
> + gcred = kmalloc(sizeof(*gcred), GFP_KERNEL);
> + if (gcred == NULL)
> + return ERR_PTR(-ENOMEM);
> +
> + rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops);
> + gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
> +
> + gcred->acred.uid = acred->uid;
> + gcred->acred.gid = acred->gid;
> + gcred->acred.group_info = acred->group_info;
> + if (gcred->acred.group_info != NULL)
> + get_group_info(gcred->acred.group_info);
> +
> + dprintk("RPC: allocated generic cred %p for uid %d gid %d\n",
> + gcred, acred->uid, acred->gid);
> + return &gcred->gc_base;
> +}
> +
> +static void
> +generic_free_cred(struct rpc_cred *cred)
> +{
> + struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
> +
> + dprintk("RPC: generic_free_cred %p\n", gcred);
> + if (gcred->acred.group_info != NULL)
> + put_group_info(gcred->acred.group_info);
> + kfree(gcred);
> +}
> +
> +static void
> +generic_free_cred_callback(struct rcu_head *head)
> +{
> + struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu);
> + generic_free_cred(cred);
> +}
> +
> +static void
> +generic_destroy_cred(struct rpc_cred *cred)
> +{
> + call_rcu(&cred->cr_rcu, generic_free_cred_callback);
> +}
> +
> +/*
> + * Match credentials against current process creds.
> + */
> +static int
> +generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
> +{
> + struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base);
> +
> + if (gcred->acred.uid != acred->uid ||
> + gcred->acred.gid != acred->gid ||
> + gcred->acred.group_info != acred->group_info)
> + return 0;
> + return 1;
> +}
> +
> +void __init rpc_init_generic_auth(void)
> +{
> + spin_lock_init(&generic_cred_cache.lock);
> +}
> +
> +void __exit rpc_destroy_generic_auth(void)
> +{
> + rpcauth_clear_credcache(&generic_cred_cache);
> +}
> +
> +static struct rpc_cred_cache generic_cred_cache = {
> + {{ NULL, },},
> +};
> +
> +static const struct rpc_authops generic_auth_ops = {
> + .owner = THIS_MODULE,
> +#ifdef RPC_DEBUG
> + .au_name = "Generic",
> +#endif
> + .lookup_cred = generic_lookup_cred,
> + .crcreate = generic_create_cred,
> +};
> +
> +static struct rpc_auth generic_auth = {
> + .au_ops = &generic_auth_ops,
> + .au_count = ATOMIC_INIT(0),
> + .au_credcache = &generic_cred_cache,
> +};
> +
> +static const struct rpc_credops generic_credops = {
> + .cr_name = "Generic cred",
> + .crdestroy = generic_destroy_cred,
> + .crmatch = generic_match,
> +};
>
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