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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sunrpc/auth_unix.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/sunrpc/auth_unix.c')
-rw-r--r--net/sunrpc/auth_unix.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
new file mode 100644
index 00000000000..4ff297a9b15
--- /dev/null
+++ b/net/sunrpc/auth_unix.c
@@ -0,0 +1,242 @@
+/*
+ * linux/net/sunrpc/auth_unix.c
+ *
+ * UNIX-style authentication; no AUTH_SHORT support
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+
+#define NFS_NGROUPS 16
+
+struct unx_cred {
+ struct rpc_cred uc_base;
+ gid_t uc_gid;
+ gid_t uc_gids[NFS_NGROUPS];
+};
+#define uc_uid uc_base.cr_uid
+#define uc_count uc_base.cr_count
+#define uc_flags uc_base.cr_flags
+#define uc_expire uc_base.cr_expire
+
+#define UNX_CRED_EXPIRE (60 * HZ)
+
+#define UNX_WRITESLACK (21 + (UNX_MAXNODENAME >> 2))
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+static struct rpc_auth unix_auth;
+static struct rpc_cred_cache unix_cred_cache;
+static struct rpc_credops unix_credops;
+
+static struct rpc_auth *
+unx_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
+{
+ dprintk("RPC: creating UNIX authenticator for client %p\n", clnt);
+ if (atomic_inc_return(&unix_auth.au_count) == 0)
+ unix_cred_cache.nextgc = jiffies + (unix_cred_cache.expire >> 1);
+ return &unix_auth;
+}
+
+static void
+unx_destroy(struct rpc_auth *auth)
+{
+ dprintk("RPC: destroying UNIX authenticator %p\n", auth);
+ rpcauth_free_credcache(auth);
+}
+
+/*
+ * Lookup AUTH_UNIX creds for current process
+ */
+static struct rpc_cred *
+unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+ return rpcauth_lookup_credcache(auth, acred, flags);
+}
+
+static struct rpc_cred *
+unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
+{
+ struct unx_cred *cred;
+ int i;
+
+ dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
+ acred->uid, acred->gid);
+
+ if (!(cred = (struct unx_cred *) kmalloc(sizeof(*cred), GFP_KERNEL)))
+ return ERR_PTR(-ENOMEM);
+
+ atomic_set(&cred->uc_count, 1);
+ cred->uc_flags = RPCAUTH_CRED_UPTODATE;
+ if (flags & RPC_TASK_ROOTCREDS) {
+ cred->uc_uid = 0;
+ cred->uc_gid = 0;
+ cred->uc_gids[0] = NOGROUP;
+ } else {
+ int groups = acred->group_info->ngroups;
+ if (groups > NFS_NGROUPS)
+ groups = NFS_NGROUPS;
+
+ cred->uc_uid = acred->uid;
+ cred->uc_gid = acred->gid;
+ for (i = 0; i < groups; i++)
+ cred->uc_gids[i] = GROUP_AT(acred->group_info, i);
+ if (i < NFS_NGROUPS)
+ cred->uc_gids[i] = NOGROUP;
+ }
+ cred->uc_base.cr_ops = &unix_credops;
+
+ return (struct rpc_cred *) cred;
+}
+
+static void
+unx_destroy_cred(struct rpc_cred *cred)
+{
+ kfree(cred);
+}
+
+/*
+ * Match credentials against current process creds.
+ * The root_override argument takes care of cases where the caller may
+ * request root creds (e.g. for NFS swapping).
+ */
+static int
+unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int taskflags)
+{
+ struct unx_cred *cred = (struct unx_cred *) rcred;
+ int i;
+
+ if (!(taskflags & RPC_TASK_ROOTCREDS)) {
+ int groups;
+
+ if (cred->uc_uid != acred->uid
+ || cred->uc_gid != acred->gid)
+ return 0;
+
+ groups = acred->group_info->ngroups;
+ if (groups > NFS_NGROUPS)
+ groups = NFS_NGROUPS;
+ for (i = 0; i < groups ; i++)
+ if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i))
+ return 0;
+ return 1;
+ }
+ return (cred->uc_uid == 0
+ && cred->uc_gid == 0
+ && cred->uc_gids[0] == (gid_t) NOGROUP);
+}
+
+/*
+ * Marshal credentials.
+ * Maybe we should keep a cached credential for performance reasons.
+ */
+static u32 *
+unx_marshal(struct rpc_task *task, u32 *p)
+{
+ struct rpc_clnt *clnt = task->tk_client;
+ struct unx_cred *cred = (struct unx_cred *) task->tk_msg.rpc_cred;
+ u32 *base, *hold;
+ int i;
+
+ *p++ = htonl(RPC_AUTH_UNIX);
+ base = p++;
+ *p++ = htonl(jiffies/HZ);
+
+ /*
+ * Copy the UTS nodename captured when the client was created.
+ */
+ p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
+
+ *p++ = htonl((u32) cred->uc_uid);
+ *p++ = htonl((u32) cred->uc_gid);
+ hold = p++;
+ for (i = 0; i < 16 && cred->uc_gids[i] != (gid_t) NOGROUP; i++)
+ *p++ = htonl((u32) cred->uc_gids[i]);
+ *hold = htonl(p - hold - 1); /* gid array length */
+ *base = htonl((p - base - 1) << 2); /* cred length */
+
+ *p++ = htonl(RPC_AUTH_NULL);
+ *p++ = htonl(0);
+
+ return p;
+}
+
+/*
+ * Refresh credentials. This is a no-op for AUTH_UNIX
+ */
+static int
+unx_refresh(struct rpc_task *task)
+{
+ task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
+ return 0;
+}
+
+static u32 *
+unx_validate(struct rpc_task *task, u32 *p)
+{
+ rpc_authflavor_t flavor;
+ u32 size;
+
+ flavor = ntohl(*p++);
+ if (flavor != RPC_AUTH_NULL &&
+ flavor != RPC_AUTH_UNIX &&
+ flavor != RPC_AUTH_SHORT) {
+ printk("RPC: bad verf flavor: %u\n", flavor);
+ return NULL;
+ }
+
+ size = ntohl(*p++);
+ if (size > RPC_MAX_AUTH_SIZE) {
+ printk("RPC: giant verf size: %u\n", size);
+ return NULL;
+ }
+ task->tk_auth->au_rslack = (size >> 2) + 2;
+ p += (size >> 2);
+
+ return p;
+}
+
+struct rpc_authops authunix_ops = {
+ .owner = THIS_MODULE,
+ .au_flavor = RPC_AUTH_UNIX,
+#ifdef RPC_DEBUG
+ .au_name = "UNIX",
+#endif
+ .create = unx_create,
+ .destroy = unx_destroy,
+ .lookup_cred = unx_lookup_cred,
+ .crcreate = unx_create_cred,
+};
+
+static
+struct rpc_cred_cache unix_cred_cache = {
+ .expire = UNX_CRED_EXPIRE,
+};
+
+static
+struct rpc_auth unix_auth = {
+ .au_cslack = UNX_WRITESLACK,
+ .au_rslack = 2, /* assume AUTH_NULL verf */
+ .au_ops = &authunix_ops,
+ .au_count = ATOMIC_INIT(0),
+ .au_credcache = &unix_cred_cache,
+};
+
+static
+struct rpc_credops unix_credops = {
+ .cr_name = "AUTH_UNIX",
+ .crdestroy = unx_destroy_cred,
+ .crmatch = unx_match,
+ .crmarshal = unx_marshal,
+ .crrefresh = unx_refresh,
+ .crvalidate = unx_validate,
+};