![Trond Myklebust](/assets/img/avatar_default.png)
Use RCU protected lookups for discovering the supported mechanisms. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
494 lines
12 KiB
C
494 lines
12 KiB
C
/*
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* linux/net/sunrpc/gss_mech_switch.c
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*
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* Copyright (c) 2001 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* J. Bruce Fields <bfields@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/oid_registry.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/gss_asn1.h>
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#include <linux/sunrpc/auth_gss.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/gss_err.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/sunrpc/clnt.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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static LIST_HEAD(registered_mechs);
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static DEFINE_SPINLOCK(registered_mechs_lock);
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static void
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gss_mech_free(struct gss_api_mech *gm)
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{
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struct pf_desc *pf;
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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pf = &gm->gm_pfs[i];
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kfree(pf->auth_domain_name);
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pf->auth_domain_name = NULL;
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}
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}
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static inline char *
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make_auth_domain_name(char *name)
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{
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static char *prefix = "gss/";
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char *new;
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new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
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if (new) {
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strcpy(new, prefix);
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strcat(new, name);
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}
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return new;
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}
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static int
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gss_mech_svc_setup(struct gss_api_mech *gm)
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{
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struct pf_desc *pf;
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int i, status;
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for (i = 0; i < gm->gm_pf_num; i++) {
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pf = &gm->gm_pfs[i];
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pf->auth_domain_name = make_auth_domain_name(pf->name);
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status = -ENOMEM;
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if (pf->auth_domain_name == NULL)
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goto out;
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status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
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pf->auth_domain_name);
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if (status)
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goto out;
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}
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return 0;
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out:
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gss_mech_free(gm);
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return status;
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}
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/**
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* gss_mech_register - register a GSS mechanism
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* @gm: GSS mechanism handle
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*
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* Returns zero if successful, or a negative errno.
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*/
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int gss_mech_register(struct gss_api_mech *gm)
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{
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int status;
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status = gss_mech_svc_setup(gm);
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if (status)
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return status;
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spin_lock(®istered_mechs_lock);
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list_add_rcu(&gm->gm_list, ®istered_mechs);
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spin_unlock(®istered_mechs_lock);
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dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(gss_mech_register);
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/**
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* gss_mech_unregister - release a GSS mechanism
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* @gm: GSS mechanism handle
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*
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*/
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void gss_mech_unregister(struct gss_api_mech *gm)
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{
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spin_lock(®istered_mechs_lock);
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list_del_rcu(&gm->gm_list);
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spin_unlock(®istered_mechs_lock);
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dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
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gss_mech_free(gm);
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}
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EXPORT_SYMBOL_GPL(gss_mech_unregister);
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struct gss_api_mech *gss_mech_get(struct gss_api_mech *gm)
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{
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__module_get(gm->gm_owner);
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return gm;
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}
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EXPORT_SYMBOL(gss_mech_get);
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static struct gss_api_mech *
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_gss_mech_get_by_name(const char *name)
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{
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struct gss_api_mech *pos, *gm = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
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if (0 == strcmp(name, pos->gm_name)) {
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if (try_module_get(pos->gm_owner))
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gm = pos;
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break;
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}
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}
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rcu_read_unlock();
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return gm;
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}
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struct gss_api_mech * gss_mech_get_by_name(const char *name)
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{
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struct gss_api_mech *gm = NULL;
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gm = _gss_mech_get_by_name(name);
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if (!gm) {
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request_module("rpc-auth-gss-%s", name);
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gm = _gss_mech_get_by_name(name);
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}
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return gm;
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}
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struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
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{
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struct gss_api_mech *pos, *gm = NULL;
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char buf[32];
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if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
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return NULL;
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dprintk("RPC: %s(%s)\n", __func__, buf);
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request_module("rpc-auth-gss-%s", buf);
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rcu_read_lock();
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list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
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if (obj->len == pos->gm_oid.len) {
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if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
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if (try_module_get(pos->gm_owner))
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gm = pos;
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break;
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}
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}
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}
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rcu_read_unlock();
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return gm;
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}
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static inline int
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mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
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{
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
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return 1;
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}
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return 0;
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}
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static struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
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{
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struct gss_api_mech *gm = NULL, *pos;
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rcu_read_lock();
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list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
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if (!mech_supports_pseudoflavor(pos, pseudoflavor))
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continue;
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if (try_module_get(pos->gm_owner))
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gm = pos;
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break;
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}
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rcu_read_unlock();
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return gm;
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}
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struct gss_api_mech *
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gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
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{
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struct gss_api_mech *gm;
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gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
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if (!gm) {
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request_module("rpc-auth-gss-%u", pseudoflavor);
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gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
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}
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return gm;
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}
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/**
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* gss_mech_list_pseudoflavors - Discover registered GSS 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 gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr, int size)
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{
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struct gss_api_mech *pos = NULL;
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int j, i = 0;
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rcu_read_lock();
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list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
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for (j = 0; j < pos->gm_pf_num; j++) {
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if (i >= size) {
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spin_unlock(®istered_mechs_lock);
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return -ENOMEM;
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}
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array_ptr[i++] = pos->gm_pfs[j].pseudoflavor;
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}
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}
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rcu_read_unlock();
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return i;
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}
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/**
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* gss_svc_to_pseudoflavor - map a GSS service number to a pseudoflavor
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* @gm: GSS mechanism handle
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* @qop: GSS quality-of-protection value
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* @service: GSS service value
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*
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* Returns a matching security flavor, or RPC_AUTH_MAXFLAVOR if none is found.
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*/
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rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 qop,
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u32 service)
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{
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].qop == qop &&
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gm->gm_pfs[i].service == service) {
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return gm->gm_pfs[i].pseudoflavor;
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}
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}
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return RPC_AUTH_MAXFLAVOR;
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}
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/**
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* gss_mech_info2flavor - look up a pseudoflavor given a GSS tuple
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* @info: a GSS mech OID, quality of protection, and service value
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*
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* Returns a matching pseudoflavor, or RPC_AUTH_MAXFLAVOR if the tuple is
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* not supported.
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*/
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rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *info)
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{
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rpc_authflavor_t pseudoflavor;
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struct gss_api_mech *gm;
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gm = gss_mech_get_by_OID(&info->oid);
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if (gm == NULL)
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return RPC_AUTH_MAXFLAVOR;
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pseudoflavor = gss_svc_to_pseudoflavor(gm, info->qop, info->service);
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gss_mech_put(gm);
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return pseudoflavor;
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}
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/**
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* gss_mech_flavor2info - look up a GSS tuple for a given 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. Otherwise a negative errno is returned.
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*/
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int gss_mech_flavor2info(rpc_authflavor_t pseudoflavor,
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struct rpcsec_gss_info *info)
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{
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struct gss_api_mech *gm;
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int i;
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gm = gss_mech_get_by_pseudoflavor(pseudoflavor);
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if (gm == NULL)
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return -ENOENT;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) {
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memcpy(info->oid.data, gm->gm_oid.data, gm->gm_oid.len);
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info->oid.len = gm->gm_oid.len;
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info->qop = gm->gm_pfs[i].qop;
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info->service = gm->gm_pfs[i].service;
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gss_mech_put(gm);
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return 0;
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}
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}
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gss_mech_put(gm);
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return -ENOENT;
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}
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u32
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gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
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{
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
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return gm->gm_pfs[i].service;
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}
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return 0;
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}
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EXPORT_SYMBOL(gss_pseudoflavor_to_service);
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bool
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gss_pseudoflavor_to_datatouch(struct gss_api_mech *gm, u32 pseudoflavor)
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{
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
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return gm->gm_pfs[i].datatouch;
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}
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return false;
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}
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char *
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gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
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{
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int i;
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for (i = 0; i < gm->gm_pf_num; i++) {
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if (gm->gm_pfs[i].service == service)
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return gm->gm_pfs[i].auth_domain_name;
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}
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return NULL;
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}
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void
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gss_mech_put(struct gss_api_mech * gm)
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{
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if (gm)
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module_put(gm->gm_owner);
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}
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EXPORT_SYMBOL(gss_mech_put);
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/* The mech could probably be determined from the token instead, but it's just
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* as easy for now to pass it in. */
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int
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gss_import_sec_context(const void *input_token, size_t bufsize,
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struct gss_api_mech *mech,
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struct gss_ctx **ctx_id,
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time_t *endtime,
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gfp_t gfp_mask)
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{
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if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
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return -ENOMEM;
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(*ctx_id)->mech_type = gss_mech_get(mech);
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return mech->gm_ops->gss_import_sec_context(input_token, bufsize,
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*ctx_id, endtime, gfp_mask);
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}
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/* gss_get_mic: compute a mic over message and return mic_token. */
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u32
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gss_get_mic(struct gss_ctx *context_handle,
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struct xdr_buf *message,
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struct xdr_netobj *mic_token)
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{
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return context_handle->mech_type->gm_ops
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->gss_get_mic(context_handle,
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message,
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mic_token);
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}
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/* gss_verify_mic: check whether the provided mic_token verifies message. */
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u32
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gss_verify_mic(struct gss_ctx *context_handle,
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struct xdr_buf *message,
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struct xdr_netobj *mic_token)
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{
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return context_handle->mech_type->gm_ops
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->gss_verify_mic(context_handle,
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message,
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mic_token);
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}
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/*
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* This function is called from both the client and server code.
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* Each makes guarantees about how much "slack" space is available
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* for the underlying function in "buf"'s head and tail while
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* performing the wrap.
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*
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* The client and server code allocate RPC_MAX_AUTH_SIZE extra
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* space in both the head and tail which is available for use by
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* the wrap function.
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*
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* Underlying functions should verify they do not use more than
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* RPC_MAX_AUTH_SIZE of extra space in either the head or tail
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* when performing the wrap.
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*/
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u32
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gss_wrap(struct gss_ctx *ctx_id,
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int offset,
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struct xdr_buf *buf,
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struct page **inpages)
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{
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return ctx_id->mech_type->gm_ops
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->gss_wrap(ctx_id, offset, buf, inpages);
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}
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u32
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gss_unwrap(struct gss_ctx *ctx_id,
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int offset,
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struct xdr_buf *buf)
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{
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return ctx_id->mech_type->gm_ops
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->gss_unwrap(ctx_id, offset, buf);
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}
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/* gss_delete_sec_context: free all resources associated with context_handle.
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* Note this differs from the RFC 2744-specified prototype in that we don't
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* bother returning an output token, since it would never be used anyway. */
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u32
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gss_delete_sec_context(struct gss_ctx **context_handle)
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{
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dprintk("RPC: gss_delete_sec_context deleting %p\n",
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*context_handle);
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if (!*context_handle)
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return GSS_S_NO_CONTEXT;
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if ((*context_handle)->internal_ctx_id)
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(*context_handle)->mech_type->gm_ops
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->gss_delete_sec_context((*context_handle)
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->internal_ctx_id);
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gss_mech_put((*context_handle)->mech_type);
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kfree(*context_handle);
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*context_handle=NULL;
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return GSS_S_COMPLETE;
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}
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