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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 | /*
* Modifications for Lustre
*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*
* Copyright (c) 2012, Intel Corporation.
*
* Author: Eric Mei <ericm@clusterfs.com>
*/
/*
* linux/net/sunrpc/auth_gss.c
*
* RPCSEC_GSS client authentication.
*
* Copyright (c) 2000 The Regents of the University of Michigan.
* All rights reserved.
*
* Dug Song <dugsong@monkey.org>
* Andy Adamson <andros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#define DEBUG_SUBSYSTEM S_SEC
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/dcache.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/crypto.h>
#include <asm/atomic.h>
struct rpc_clnt; /* for rpc_pipefs */
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <obd.h>
#include <obd_class.h>
#include <obd_support.h>
#include <lustre/lustre_idl.h>
#include <lustre_sec.h>
#include <lustre_net.h>
#include <lustre_import.h>
#include "gss_err.h"
#include "gss_internal.h"
#include "gss_api.h"
static struct ptlrpc_sec_policy gss_policy_pipefs;
static struct ptlrpc_ctx_ops gss_pipefs_ctxops;
static int gss_cli_ctx_refresh_pf(struct ptlrpc_cli_ctx *ctx);
static int gss_sec_pipe_upcall_init(struct gss_sec *gsec)
{
return 0;
}
static void gss_sec_pipe_upcall_fini(struct gss_sec *gsec)
{
}
/****************************************
* internel context helpers *
****************************************/
static
struct ptlrpc_cli_ctx *ctx_create_pf(struct ptlrpc_sec *sec,
struct vfs_cred *vcred)
{
struct gss_cli_ctx *gctx;
int rc;
OBD_ALLOC_PTR(gctx);
if (gctx == NULL)
return NULL;
rc = gss_cli_ctx_init_common(sec, &gctx->gc_base,
&gss_pipefs_ctxops, vcred);
if (rc) {
OBD_FREE_PTR(gctx);
return NULL;
}
return &gctx->gc_base;
}
static
void ctx_destroy_pf(struct ptlrpc_sec *sec, struct ptlrpc_cli_ctx *ctx)
{
struct gss_cli_ctx *gctx = ctx2gctx(ctx);
if (gss_cli_ctx_fini_common(sec, ctx))
return;
OBD_FREE_PTR(gctx);
atomic_dec(&sec->ps_nctx);
sptlrpc_sec_put(sec);
}
static
void ctx_enhash_pf(struct ptlrpc_cli_ctx *ctx, struct hlist_head *hash)
{
set_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags);
atomic_inc(&ctx->cc_refcount);
hlist_add_head(&ctx->cc_cache, hash);
}
/*
* caller must hold spinlock
*/
static
void ctx_unhash_pf(struct ptlrpc_cli_ctx *ctx, struct hlist_head *freelist)
{
LASSERT(spin_is_locked(&ctx->cc_sec->ps_lock));
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags));
LASSERT(!hlist_unhashed(&ctx->cc_cache));
clear_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags);
if (atomic_dec_and_test(&ctx->cc_refcount)) {
__hlist_del(&ctx->cc_cache);
hlist_add_head(&ctx->cc_cache, freelist);
} else {
hlist_del_init(&ctx->cc_cache);
}
}
/*
* return 1 if the context is dead.
*/
static
int ctx_check_death_pf(struct ptlrpc_cli_ctx *ctx,
struct hlist_head *freelist)
{
if (cli_ctx_check_death(ctx)) {
if (freelist)
ctx_unhash_pf(ctx, freelist);
return 1;
}
return 0;
}
static inline
int ctx_check_death_locked_pf(struct ptlrpc_cli_ctx *ctx,
struct hlist_head *freelist)
{
LASSERT(ctx->cc_sec);
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags));
return ctx_check_death_pf(ctx, freelist);
}
static inline
int ctx_match_pf(struct ptlrpc_cli_ctx *ctx, struct vfs_cred *vcred)
{
/* a little bit optimization for null policy */
if (!ctx->cc_ops->match)
return 1;
return ctx->cc_ops->match(ctx, vcred);
}
static
void ctx_list_destroy_pf(struct hlist_head *head)
{
struct ptlrpc_cli_ctx *ctx;
while (!hlist_empty(head)) {
ctx = hlist_entry(head->first, struct ptlrpc_cli_ctx,
cc_cache);
LASSERT(atomic_read(&ctx->cc_refcount) == 0);
LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT,
&ctx->cc_flags) == 0);
hlist_del_init(&ctx->cc_cache);
ctx_destroy_pf(ctx->cc_sec, ctx);
}
}
/****************************************
* context apis *
****************************************/
static
int gss_cli_ctx_validate_pf(struct ptlrpc_cli_ctx *ctx)
{
if (ctx_check_death_pf(ctx, NULL))
return 1;
if (cli_ctx_is_ready(ctx))
return 0;
return 1;
}
static
void gss_cli_ctx_die_pf(struct ptlrpc_cli_ctx *ctx, int grace)
{
LASSERT(ctx->cc_sec);
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
cli_ctx_expire(ctx);
spin_lock(&ctx->cc_sec->ps_lock);
if (test_and_clear_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags)) {
LASSERT(!hlist_unhashed(&ctx->cc_cache));
LASSERT(atomic_read(&ctx->cc_refcount) > 1);
hlist_del_init(&ctx->cc_cache);
if (atomic_dec_and_test(&ctx->cc_refcount))
LBUG();
}
spin_unlock(&ctx->cc_sec->ps_lock);
}
/****************************************
* reverse context installation *
****************************************/
static inline
unsigned int ctx_hash_index(int hashsize, __u64 key)
{
return (unsigned int) (key & ((__u64) hashsize - 1));
}
static
void gss_sec_ctx_replace_pf(struct gss_sec *gsec,
struct ptlrpc_cli_ctx *new)
{
struct gss_sec_pipefs *gsec_pf;
struct ptlrpc_cli_ctx *ctx;
struct hlist_node *next;
HLIST_HEAD(freelist);
unsigned int hash;
gsec_pf = container_of(gsec, struct gss_sec_pipefs, gsp_base);
hash = ctx_hash_index(gsec_pf->gsp_chash_size,
(__u64) new->cc_vcred.vc_uid);
LASSERT(hash < gsec_pf->gsp_chash_size);
spin_lock(&gsec->gs_base.ps_lock);
hlist_for_each_entry_safe(ctx, next,
&gsec_pf->gsp_chash[hash], cc_cache) {
if (!ctx_match_pf(ctx, &new->cc_vcred))
continue;
cli_ctx_expire(ctx);
ctx_unhash_pf(ctx, &freelist);
break;
}
ctx_enhash_pf(new, &gsec_pf->gsp_chash[hash]);
spin_unlock(&gsec->gs_base.ps_lock);
ctx_list_destroy_pf(&freelist);
}
static
int gss_install_rvs_cli_ctx_pf(struct gss_sec *gsec,
struct ptlrpc_svc_ctx *svc_ctx)
{
struct vfs_cred vcred;
struct ptlrpc_cli_ctx *cli_ctx;
int rc;
vcred.vc_uid = 0;
vcred.vc_gid = 0;
cli_ctx = ctx_create_pf(&gsec->gs_base, &vcred);
if (!cli_ctx)
return -ENOMEM;
rc = gss_copy_rvc_cli_ctx(cli_ctx, svc_ctx);
if (rc) {
ctx_destroy_pf(cli_ctx->cc_sec, cli_ctx);
return rc;
}
gss_sec_ctx_replace_pf(gsec, cli_ctx);
return 0;
}
static
void gss_ctx_cache_gc_pf(struct gss_sec_pipefs *gsec_pf,
struct hlist_head *freelist)
{
struct ptlrpc_sec *sec;
struct ptlrpc_cli_ctx *ctx;
struct hlist_node *next;
int i;
sec = &gsec_pf->gsp_base.gs_base;
CDEBUG(D_SEC, "do gc on sec %s@%p\n", sec->ps_policy->sp_name, sec);
for (i = 0; i < gsec_pf->gsp_chash_size; i++) {
hlist_for_each_entry_safe(ctx, next,
&gsec_pf->gsp_chash[i], cc_cache)
ctx_check_death_locked_pf(ctx, freelist);
}
sec->ps_gc_next = cfs_time_current_sec() + sec->ps_gc_interval;
}
static
struct ptlrpc_sec* gss_sec_create_pf(struct obd_import *imp,
struct ptlrpc_svc_ctx *ctx,
struct sptlrpc_flavor *sf)
{
struct gss_sec_pipefs *gsec_pf;
int alloc_size, hash_size, i;
#define GSS_SEC_PIPEFS_CTX_HASH_SIZE (32)
if (ctx ||
sf->sf_flags & (PTLRPC_SEC_FL_ROOTONLY | PTLRPC_SEC_FL_REVERSE))
hash_size = 1;
else
hash_size = GSS_SEC_PIPEFS_CTX_HASH_SIZE;
alloc_size = sizeof(*gsec_pf) +
sizeof(struct hlist_head) * hash_size;
OBD_ALLOC(gsec_pf, alloc_size);
if (!gsec_pf)
return NULL;
gsec_pf->gsp_chash_size = hash_size;
for (i = 0; i < hash_size; i++)
INIT_HLIST_HEAD(&gsec_pf->gsp_chash[i]);
if (gss_sec_create_common(&gsec_pf->gsp_base, &gss_policy_pipefs,
imp, ctx, sf))
goto err_free;
if (ctx == NULL) {
if (gss_sec_pipe_upcall_init(&gsec_pf->gsp_base))
goto err_destroy;
} else {
if (gss_install_rvs_cli_ctx_pf(&gsec_pf->gsp_base, ctx))
goto err_destroy;
}
return &gsec_pf->gsp_base.gs_base;
err_destroy:
gss_sec_destroy_common(&gsec_pf->gsp_base);
err_free:
OBD_FREE(gsec_pf, alloc_size);
return NULL;
}
static
void gss_sec_destroy_pf(struct ptlrpc_sec *sec)
{
struct gss_sec_pipefs *gsec_pf;
struct gss_sec *gsec;
CWARN("destroy %s@%p\n", sec->ps_policy->sp_name, sec);
gsec = container_of(sec, struct gss_sec, gs_base);
gsec_pf = container_of(gsec, struct gss_sec_pipefs, gsp_base);
LASSERT(gsec_pf->gsp_chash);
LASSERT(gsec_pf->gsp_chash_size);
gss_sec_pipe_upcall_fini(gsec);
gss_sec_destroy_common(gsec);
OBD_FREE(gsec, sizeof(*gsec_pf) +
sizeof(struct hlist_head) * gsec_pf->gsp_chash_size);
}
static
struct ptlrpc_cli_ctx * gss_sec_lookup_ctx_pf(struct ptlrpc_sec *sec,
struct vfs_cred *vcred,
int create, int remove_dead)
{
struct gss_sec *gsec;
struct gss_sec_pipefs *gsec_pf;
struct ptlrpc_cli_ctx *ctx = NULL, *new = NULL;
struct hlist_head *hash_head;
struct hlist_node *next;
HLIST_HEAD(freelist);
unsigned int hash, gc = 0, found = 0;
might_sleep();
gsec = container_of(sec, struct gss_sec, gs_base);
gsec_pf = container_of(gsec, struct gss_sec_pipefs, gsp_base);
hash = ctx_hash_index(gsec_pf->gsp_chash_size,
(__u64) vcred->vc_uid);
hash_head = &gsec_pf->gsp_chash[hash];
LASSERT(hash < gsec_pf->gsp_chash_size);
retry:
spin_lock(&sec->ps_lock);
/* gc_next == 0 means never do gc */
if (remove_dead && sec->ps_gc_next &&
cfs_time_after(cfs_time_current_sec(), sec->ps_gc_next)) {
gss_ctx_cache_gc_pf(gsec_pf, &freelist);
gc = 1;
}
hlist_for_each_entry_safe(ctx, next, hash_head, cc_cache) {
if (gc == 0 &&
ctx_check_death_locked_pf(ctx,
remove_dead ? &freelist : NULL))
continue;
if (ctx_match_pf(ctx, vcred)) {
found = 1;
break;
}
}
if (found) {
if (new && new != ctx) {
/* lost the race, just free it */
hlist_add_head(&new->cc_cache, &freelist);
new = NULL;
}
/* hot node, move to head */
if (hash_head->first != &ctx->cc_cache) {
__hlist_del(&ctx->cc_cache);
hlist_add_head(&ctx->cc_cache, hash_head);
}
} else {
/* don't allocate for reverse sec */
if (sec_is_reverse(sec)) {
spin_unlock(&sec->ps_lock);
return NULL;
}
if (new) {
ctx_enhash_pf(new, hash_head);
ctx = new;
} else if (create) {
spin_unlock(&sec->ps_lock);
new = ctx_create_pf(sec, vcred);
if (new) {
clear_bit(PTLRPC_CTX_NEW_BIT, &new->cc_flags);
goto retry;
}
} else {
ctx = NULL;
}
}
/* hold a ref */
if (ctx)
atomic_inc(&ctx->cc_refcount);
spin_unlock(&sec->ps_lock);
/* the allocator of the context must give the first push to refresh */
if (new) {
LASSERT(new == ctx);
gss_cli_ctx_refresh_pf(new);
}
ctx_list_destroy_pf(&freelist);
return ctx;
}
static
void gss_sec_release_ctx_pf(struct ptlrpc_sec *sec,
struct ptlrpc_cli_ctx *ctx,
int sync)
{
LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags) == 0);
LASSERT(hlist_unhashed(&ctx->cc_cache));
/* if required async, we must clear the UPTODATE bit to prevent extra
* rpcs during destroy procedure. */
if (!sync)
clear_bit(PTLRPC_CTX_UPTODATE_BIT, &ctx->cc_flags);
/* destroy this context */
ctx_destroy_pf(sec, ctx);
}
/*
* @uid: which user. "-1" means flush all.
* @grace: mark context DEAD, allow graceful destroy like notify
* server side, etc.
* @force: also flush busy entries.
*
* return the number of busy context encountered.
*
* In any cases, never touch "eternal" contexts.
*/
static
int gss_sec_flush_ctx_cache_pf(struct ptlrpc_sec *sec,
uid_t uid,
int grace, int force)
{
struct gss_sec *gsec;
struct gss_sec_pipefs *gsec_pf;
struct ptlrpc_cli_ctx *ctx;
struct hlist_node *next;
HLIST_HEAD(freelist);
int i, busy = 0;
might_sleep_if(grace);
gsec = container_of(sec, struct gss_sec, gs_base);
gsec_pf = container_of(gsec, struct gss_sec_pipefs, gsp_base);
spin_lock(&sec->ps_lock);
for (i = 0; i < gsec_pf->gsp_chash_size; i++) {
hlist_for_each_entry_safe(ctx, next,
&gsec_pf->gsp_chash[i],
cc_cache) {
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
if (uid != -1 && uid != ctx->cc_vcred.vc_uid)
continue;
if (atomic_read(&ctx->cc_refcount) > 1) {
busy++;
if (!force)
continue;
CWARN("flush busy(%d) ctx %p(%u->%s) by force, "
"grace %d\n",
atomic_read(&ctx->cc_refcount),
ctx, ctx->cc_vcred.vc_uid,
sec2target_str(ctx->cc_sec), grace);
}
ctx_unhash_pf(ctx, &freelist);
set_bit(PTLRPC_CTX_DEAD_BIT, &ctx->cc_flags);
if (!grace)
clear_bit(PTLRPC_CTX_UPTODATE_BIT,
&ctx->cc_flags);
}
}
spin_unlock(&sec->ps_lock);
ctx_list_destroy_pf(&freelist);
return busy;
}
/****************************************
* service apis *
****************************************/
static
int gss_svc_accept_pf(struct ptlrpc_request *req)
{
return gss_svc_accept(&gss_policy_pipefs, req);
}
static
int gss_svc_install_rctx_pf(struct obd_import *imp,
struct ptlrpc_svc_ctx *ctx)
{
struct ptlrpc_sec *sec;
int rc;
sec = sptlrpc_import_sec_ref(imp);
LASSERT(sec);
rc = gss_install_rvs_cli_ctx_pf(sec2gsec(sec), ctx);
sptlrpc_sec_put(sec);
return rc;
}
/****************************************
* rpc_pipefs definitions *
****************************************/
#define LUSTRE_PIPE_ROOT "/lustre"
#define LUSTRE_PIPE_KRB5 LUSTRE_PIPE_ROOT"/krb5"
struct gss_upcall_msg_data {
__u32 gum_seq;
__u32 gum_uid;
__u32 gum_gid;
__u32 gum_svc; /* MDS/OSS... */
__u64 gum_nid; /* peer NID */
__u8 gum_obd[64]; /* client obd name */
};
struct gss_upcall_msg {
struct rpc_pipe_msg gum_base;
atomic_t gum_refcount;
struct list_head gum_list;
__u32 gum_mechidx;
struct gss_sec *gum_gsec;
struct gss_cli_ctx *gum_gctx;
struct gss_upcall_msg_data gum_data;
};
static atomic_t upcall_seq = ATOMIC_INIT(0);
static inline
__u32 upcall_get_sequence(void)
{
return (__u32) atomic_inc_return(&upcall_seq);
}
enum mech_idx_t {
MECH_KRB5 = 0,
MECH_MAX
};
static inline
__u32 mech_name2idx(const char *name)
{
LASSERT(!strcmp(name, "krb5"));
return MECH_KRB5;
}
/* pipefs dentries for each mechanisms */
static struct dentry *de_pipes[MECH_MAX] = { NULL, };
/* all upcall messgaes linked here */
static struct list_head upcall_lists[MECH_MAX];
/* and protected by this */
static spinlock_t upcall_locks[MECH_MAX];
static inline
void upcall_list_lock(int idx)
{
spin_lock(&upcall_locks[idx]);
}
static inline
void upcall_list_unlock(int idx)
{
spin_unlock(&upcall_locks[idx]);
}
static
void upcall_msg_enlist(struct gss_upcall_msg *msg)
{
__u32 idx = msg->gum_mechidx;
upcall_list_lock(idx);
list_add(&msg->gum_list, &upcall_lists[idx]);
upcall_list_unlock(idx);
}
static
void upcall_msg_delist(struct gss_upcall_msg *msg)
{
__u32 idx = msg->gum_mechidx;
upcall_list_lock(idx);
list_del_init(&msg->gum_list);
upcall_list_unlock(idx);
}
/****************************************
* rpc_pipefs upcall helpers *
****************************************/
static
void gss_release_msg(struct gss_upcall_msg *gmsg)
{
LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
if (!atomic_dec_and_test(&gmsg->gum_refcount)) {
return;
}
if (gmsg->gum_gctx) {
sptlrpc_cli_ctx_wakeup(&gmsg->gum_gctx->gc_base);
sptlrpc_cli_ctx_put(&gmsg->gum_gctx->gc_base, 1);
gmsg->gum_gctx = NULL;
}
LASSERT(list_empty(&gmsg->gum_list));
LASSERT(list_empty(&gmsg->gum_base.list));
OBD_FREE_PTR(gmsg);
}
static
void gss_unhash_msg_nolock(struct gss_upcall_msg *gmsg)
{
__u32 idx = gmsg->gum_mechidx;
LASSERT(idx < MECH_MAX);
LASSERT(spin_is_locked(&upcall_locks[idx]));
if (list_empty(&gmsg->gum_list))
return;
list_del_init(&gmsg->gum_list);
LASSERT(atomic_read(&gmsg->gum_refcount) > 1);
atomic_dec(&gmsg->gum_refcount);
}
static
void gss_unhash_msg(struct gss_upcall_msg *gmsg)
{
__u32 idx = gmsg->gum_mechidx;
LASSERT(idx < MECH_MAX);
upcall_list_lock(idx);
gss_unhash_msg_nolock(gmsg);
upcall_list_unlock(idx);
}
static
void gss_msg_fail_ctx(struct gss_upcall_msg *gmsg)
{
if (gmsg->gum_gctx) {
struct ptlrpc_cli_ctx *ctx = &gmsg->gum_gctx->gc_base;
LASSERT(atomic_read(&ctx->cc_refcount) > 0);
sptlrpc_cli_ctx_expire(ctx);
set_bit(PTLRPC_CTX_ERROR_BIT, &ctx->cc_flags);
}
}
static
struct gss_upcall_msg * gss_find_upcall(__u32 mechidx, __u32 seq)
{
struct gss_upcall_msg *gmsg;
upcall_list_lock(mechidx);
list_for_each_entry(gmsg, &upcall_lists[mechidx], gum_list) {
if (gmsg->gum_data.gum_seq != seq)
continue;
LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
LASSERT(gmsg->gum_mechidx == mechidx);
atomic_inc(&gmsg->gum_refcount);
upcall_list_unlock(mechidx);
return gmsg;
}
upcall_list_unlock(mechidx);
return NULL;
}
static
int simple_get_bytes(char **buf, __u32 *buflen, void *res, __u32 reslen)
{
if (*buflen < reslen) {
CERROR("buflen %u < %u\n", *buflen, reslen);
return -EINVAL;
}
memcpy(res, *buf, reslen);
*buf += reslen;
*buflen -= reslen;
return 0;
}
/****************************************
* rpc_pipefs apis *
****************************************/
static
ssize_t gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
char *dst, size_t buflen)
{
char *data = (char *)msg->data + msg->copied;
ssize_t mlen = msg->len;
ssize_t left;
if (mlen > buflen)
mlen = buflen;
left = copy_to_user(dst, data, mlen);
if (left < 0) {
msg->errno = left;
return left;
}
mlen -= left;
msg->copied += mlen;
msg->errno = 0;
return mlen;
}
static
ssize_t gss_pipe_downcall(struct file *filp, const char *src, size_t mlen)
{
struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode);
struct gss_upcall_msg *gss_msg;
struct ptlrpc_cli_ctx *ctx;
struct gss_cli_ctx *gctx = NULL;
char *buf, *data;
int datalen;
int timeout, rc;
__u32 mechidx, seq, gss_err;
mechidx = (__u32) (long) rpci->private;
LASSERT(mechidx < MECH_MAX);
OBD_ALLOC(buf, mlen);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, src, mlen)) {
CERROR("failed copy user space data\n");
GOTO(out_free, rc = -EFAULT);
}
data = buf;
datalen = mlen;
/* data passed down format:
* - seq
* - timeout
* - gc_win / error
* - wire_ctx (rawobj)
* - mech_ctx (rawobj)
*/
if (simple_get_bytes(&data, &datalen, &seq, sizeof(seq))) {
CERROR("fail to get seq\n");
GOTO(out_free, rc = -EFAULT);
}
gss_msg = gss_find_upcall(mechidx, seq);
if (!gss_msg) {
CERROR("upcall %u has aborted earlier\n", seq);
GOTO(out_free, rc = -EINVAL);
}
gss_unhash_msg(gss_msg);
gctx = gss_msg->gum_gctx;
LASSERT(gctx);
LASSERT(atomic_read(&gctx->gc_base.cc_refcount) > 0);
/* timeout is not in use for now */
if (simple_get_bytes(&data, &datalen, &timeout, sizeof(timeout)))
GOTO(out_msg, rc = -EFAULT);
/* lgssd signal an error by gc_win == 0 */
if (simple_get_bytes(&data, &datalen, &gctx->gc_win,
sizeof(gctx->gc_win)))
GOTO(out_msg, rc = -EFAULT);
if (gctx->gc_win == 0) {
/* followed by:
* - rpc error
* - gss error
*/
if (simple_get_bytes(&data, &datalen, &rc, sizeof(rc)))
GOTO(out_msg, rc = -EFAULT);
if (simple_get_bytes(&data, &datalen, &gss_err,sizeof(gss_err)))
GOTO(out_msg, rc = -EFAULT);
if (rc == 0 && gss_err == GSS_S_COMPLETE) {
CWARN("both rpc & gss error code not set\n");
rc = -EPERM;
}
} else {
rawobj_t tmpobj;
/* handle */
if (rawobj_extract_local(&tmpobj, (__u32 **) &data, &datalen))
GOTO(out_msg, rc = -EFAULT);
if (rawobj_dup(&gctx->gc_handle, &tmpobj))
GOTO(out_msg, rc = -ENOMEM);
/* mechctx */
if (rawobj_extract_local(&tmpobj, (__u32 **) &data, &datalen))
GOTO(out_msg, rc = -EFAULT);
gss_err = lgss_import_sec_context(&tmpobj,
gss_msg->gum_gsec->gs_mech,
&gctx->gc_mechctx);
rc = 0;
}
if (likely(rc == 0 && gss_err == GSS_S_COMPLETE)) {
gss_cli_ctx_uptodate(gctx);
} else {
ctx = &gctx->gc_base;
sptlrpc_cli_ctx_expire(ctx);
if (rc != -ERESTART || gss_err != GSS_S_COMPLETE)
set_bit(PTLRPC_CTX_ERROR_BIT, &ctx->cc_flags);
CERROR("refresh ctx %p(uid %d) failed: %d/0x%08x: %s\n",
ctx, ctx->cc_vcred.vc_uid, rc, gss_err,
test_bit(PTLRPC_CTX_ERROR_BIT, &ctx->cc_flags) ?
"fatal error" : "non-fatal");
}
rc = mlen;
out_msg:
gss_release_msg(gss_msg);
out_free:
OBD_FREE(buf, mlen);
/* FIXME
* hack pipefs: always return asked length unless all following
* downcalls might be messed up. */
rc = mlen;
return rc;
}
static
void gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
{
struct gss_upcall_msg *gmsg;
struct gss_upcall_msg_data *gumd;
static cfs_time_t ratelimit = 0;
LASSERT(list_empty(&msg->list));
/* normally errno is >= 0 */
if (msg->errno >= 0) {
return;
}
gmsg = container_of(msg, struct gss_upcall_msg, gum_base);
gumd = &gmsg->gum_data;
LASSERT(atomic_read(&gmsg->gum_refcount) > 0);
CERROR("failed msg %p (seq %u, uid %u, svc %u, nid "LPX64", obd %.*s): "
"errno %d\n", msg, gumd->gum_seq, gumd->gum_uid, gumd->gum_svc,
gumd->gum_nid, (int) sizeof(gumd->gum_obd),
gumd->gum_obd, msg->errno);
atomic_inc(&gmsg->gum_refcount);
gss_unhash_msg(gmsg);
if (msg->errno == -ETIMEDOUT || msg->errno == -EPIPE) {
cfs_time_t now = cfs_time_current_sec();
if (cfs_time_after(now, ratelimit)) {
CWARN("upcall timed out, is lgssd running?\n");
ratelimit = now + 15;
}
}
gss_msg_fail_ctx(gmsg);
gss_release_msg(gmsg);
}
static
void gss_pipe_release(struct inode *inode)
{
struct rpc_inode *rpci = RPC_I(inode);
__u32 idx;
idx = (__u32) (long) rpci->private;
LASSERT(idx < MECH_MAX);
upcall_list_lock(idx);
while (!list_empty(&upcall_lists[idx])) {
struct gss_upcall_msg *gmsg;
struct gss_upcall_msg_data *gumd;
gmsg = list_entry(upcall_lists[idx].next,
struct gss_upcall_msg, gum_list);
gumd = &gmsg->gum_data;
LASSERT(list_empty(&gmsg->gum_base.list));
CERROR("failing remaining msg %p:seq %u, uid %u, svc %u, "
"nid "LPX64", obd %.*s\n", gmsg,
gumd->gum_seq, gumd->gum_uid, gumd->gum_svc,
gumd->gum_nid, (int) sizeof(gumd->gum_obd),
gumd->gum_obd);
gmsg->gum_base.errno = -EPIPE;
atomic_inc(&gmsg->gum_refcount);
gss_unhash_msg_nolock(gmsg);
gss_msg_fail_ctx(gmsg);
upcall_list_unlock(idx);
gss_release_msg(gmsg);
upcall_list_lock(idx);
}
upcall_list_unlock(idx);
}
static struct rpc_pipe_ops gss_upcall_ops = {
.upcall = gss_pipe_upcall,
.downcall = gss_pipe_downcall,
.destroy_msg = gss_pipe_destroy_msg,
.release_pipe = gss_pipe_release,
};
/****************************************
* upcall helper functions *
****************************************/
static
int gss_ctx_refresh_pf(struct ptlrpc_cli_ctx *ctx)
{
struct obd_import *imp;
struct gss_sec *gsec;
struct gss_upcall_msg *gmsg;
int rc = 0;
might_sleep();
LASSERT(ctx->cc_sec);
LASSERT(ctx->cc_sec->ps_import);
LASSERT(ctx->cc_sec->ps_import->imp_obd);
imp = ctx->cc_sec->ps_import;
if (!imp->imp_connection) {
CERROR("import has no connection set\n");
return -EINVAL;
}
gsec = container_of(ctx->cc_sec, struct gss_sec, gs_base);
OBD_ALLOC_PTR(gmsg);
if (!gmsg)
return -ENOMEM;
/* initialize pipefs base msg */
INIT_LIST_HEAD(&gmsg->gum_base.list);
gmsg->gum_base.data = &gmsg->gum_data;
gmsg->gum_base.len = sizeof(gmsg->gum_data);
gmsg->gum_base.copied = 0;
gmsg->gum_base.errno = 0;
/* init upcall msg */
atomic_set(&gmsg->gum_refcount, 1);
gmsg->gum_mechidx = mech_name2idx(gsec->gs_mech->gm_name);
gmsg->gum_gsec = gsec;
gmsg->gum_gctx = container_of(sptlrpc_cli_ctx_get(ctx),
struct gss_cli_ctx, gc_base);
gmsg->gum_data.gum_seq = upcall_get_sequence();
gmsg->gum_data.gum_uid = ctx->cc_vcred.vc_uid;
gmsg->gum_data.gum_gid = 0; /* not used for now */
gmsg->gum_data.gum_svc = import_to_gss_svc(imp);
gmsg->gum_data.gum_nid = imp->imp_connection->c_peer.nid;
strncpy(gmsg->gum_data.gum_obd, imp->imp_obd->obd_name,
sizeof(gmsg->gum_data.gum_obd));
/* This only could happen when sysadmin set it dead/expired
* using lctl by force. */
if (ctx->cc_flags & PTLRPC_CTX_STATUS_MASK) {
CWARN("ctx %p(%u->%s) was set flags %lx unexpectedly\n",
ctx, ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec),
ctx->cc_flags);
LASSERT(!(ctx->cc_flags & PTLRPC_CTX_UPTODATE));
ctx->cc_flags |= PTLRPC_CTX_DEAD | PTLRPC_CTX_ERROR;
rc = -EIO;
goto err_free;
}
upcall_msg_enlist(gmsg);
rc = rpc_queue_upcall(de_pipes[gmsg->gum_mechidx]->d_inode,
&gmsg->gum_base);
if (rc) {
CERROR("rpc_queue_upcall failed: %d\n", rc);
upcall_msg_delist(gmsg);
goto err_free;
}
return 0;
err_free:
OBD_FREE_PTR(gmsg);
return rc;
}
static
int gss_cli_ctx_refresh_pf(struct ptlrpc_cli_ctx *ctx)
{
/* if we are refreshing for root, also update the reverse
* handle index, do not confuse reverse contexts. */
if (ctx->cc_vcred.vc_uid == 0) {
struct gss_sec *gsec;
gsec = container_of(ctx->cc_sec, struct gss_sec, gs_base);
gsec->gs_rvs_hdl = gss_get_next_ctx_index();
}
return gss_ctx_refresh_pf(ctx);
}
/****************************************
* lustre gss pipefs policy *
****************************************/
static struct ptlrpc_ctx_ops gss_pipefs_ctxops = {
.match = gss_cli_ctx_match,
.refresh = gss_cli_ctx_refresh_pf,
.validate = gss_cli_ctx_validate_pf,
.die = gss_cli_ctx_die_pf,
.sign = gss_cli_ctx_sign,
.verify = gss_cli_ctx_verify,
.seal = gss_cli_ctx_seal,
.unseal = gss_cli_ctx_unseal,
.wrap_bulk = gss_cli_ctx_wrap_bulk,
.unwrap_bulk = gss_cli_ctx_unwrap_bulk,
};
static struct ptlrpc_sec_cops gss_sec_pipefs_cops = {
.create_sec = gss_sec_create_pf,
.destroy_sec = gss_sec_destroy_pf,
.kill_sec = gss_sec_kill,
.lookup_ctx = gss_sec_lookup_ctx_pf,
.release_ctx = gss_sec_release_ctx_pf,
.flush_ctx_cache = gss_sec_flush_ctx_cache_pf,
.install_rctx = gss_sec_install_rctx,
.alloc_reqbuf = gss_alloc_reqbuf,
.free_reqbuf = gss_free_reqbuf,
.alloc_repbuf = gss_alloc_repbuf,
.free_repbuf = gss_free_repbuf,
.enlarge_reqbuf = gss_enlarge_reqbuf,
};
static struct ptlrpc_sec_sops gss_sec_pipefs_sops = {
.accept = gss_svc_accept_pf,
.invalidate_ctx = gss_svc_invalidate_ctx,
.alloc_rs = gss_svc_alloc_rs,
.authorize = gss_svc_authorize,
.free_rs = gss_svc_free_rs,
.free_ctx = gss_svc_free_ctx,
.unwrap_bulk = gss_svc_unwrap_bulk,
.wrap_bulk = gss_svc_wrap_bulk,
.install_rctx = gss_svc_install_rctx_pf,
};
static struct ptlrpc_sec_policy gss_policy_pipefs = {
.sp_owner = THIS_MODULE,
.sp_name = "gss.pipefs",
.sp_policy = SPTLRPC_POLICY_GSS_PIPEFS,
.sp_cops = &gss_sec_pipefs_cops,
.sp_sops = &gss_sec_pipefs_sops,
};
static
int __init gss_init_pipefs_upcall(void)
{
struct dentry *de;
/* pipe dir */
de = rpc_mkdir(LUSTRE_PIPE_ROOT, NULL);
if (IS_ERR(de) && PTR_ERR(de) != -EEXIST) {
CERROR("Failed to create gss pipe dir: %ld\n", PTR_ERR(de));
return PTR_ERR(de);
}
/* FIXME hack pipefs: dput will sometimes cause oops during module
* unload and lgssd close the pipe fds. */
/* krb5 mechanism */
de = rpc_mkpipe(LUSTRE_PIPE_KRB5, (void *) MECH_KRB5, &gss_upcall_ops,
RPC_PIPE_WAIT_FOR_OPEN);
if (!de || IS_ERR(de)) {
CERROR("failed to make rpc_pipe %s: %ld\n",
LUSTRE_PIPE_KRB5, PTR_ERR(de));
rpc_rmdir(LUSTRE_PIPE_ROOT);
return PTR_ERR(de);
}
de_pipes[MECH_KRB5] = de;
INIT_LIST_HEAD(&upcall_lists[MECH_KRB5]);
spin_lock_init(&upcall_locks[MECH_KRB5]);
return 0;
}
static
void __exit gss_exit_pipefs_upcall(void)
{
__u32 i;
for (i = 0; i < MECH_MAX; i++) {
LASSERT(list_empty(&upcall_lists[i]));
/* dput pipe dentry here might cause lgssd oops. */
de_pipes[i] = NULL;
}
rpc_unlink(LUSTRE_PIPE_KRB5);
rpc_rmdir(LUSTRE_PIPE_ROOT);
}
int __init gss_init_pipefs(void)
{
int rc;
rc = gss_init_pipefs_upcall();
if (rc)
return rc;
rc = sptlrpc_register_policy(&gss_policy_pipefs);
if (rc) {
gss_exit_pipefs_upcall();
return rc;
}
return 0;
}
void __exit gss_exit_pipefs(void)
{
gss_exit_pipefs_upcall();
sptlrpc_unregister_policy(&gss_policy_pipefs);
}
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